PM: Remove CONFIG_PM_OPS
[linux-2.6.git] / drivers / scsi / pmcraid.c
1 /*
2  * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
3  *
4  * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
5  *             PMC-Sierra Inc
6  *
7  * Copyright (C) 2008, 2009 PMC Sierra Inc
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
22  * USA
23  *
24  */
25 #include <linux/fs.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/errno.h>
29 #include <linux/kernel.h>
30 #include <linux/ioport.h>
31 #include <linux/delay.h>
32 #include <linux/pci.h>
33 #include <linux/wait.h>
34 #include <linux/spinlock.h>
35 #include <linux/sched.h>
36 #include <linux/interrupt.h>
37 #include <linux/blkdev.h>
38 #include <linux/firmware.h>
39 #include <linux/module.h>
40 #include <linux/moduleparam.h>
41 #include <linux/hdreg.h>
42 #include <linux/version.h>
43 #include <linux/io.h>
44 #include <linux/slab.h>
45 #include <asm/irq.h>
46 #include <asm/processor.h>
47 #include <linux/libata.h>
48 #include <linux/mutex.h>
49 #include <scsi/scsi.h>
50 #include <scsi/scsi_host.h>
51 #include <scsi/scsi_device.h>
52 #include <scsi/scsi_tcq.h>
53 #include <scsi/scsi_eh.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsicam.h>
56
57 #include "pmcraid.h"
58
59 /*
60  *   Module configuration parameters
61  */
62 static unsigned int pmcraid_debug_log;
63 static unsigned int pmcraid_disable_aen;
64 static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
65 static unsigned int pmcraid_enable_msix;
66
67 /*
68  * Data structures to support multiple adapters by the LLD.
69  * pmcraid_adapter_count - count of configured adapters
70  */
71 static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
72
73 /*
74  * Supporting user-level control interface through IOCTL commands.
75  * pmcraid_major - major number to use
76  * pmcraid_minor - minor number(s) to use
77  */
78 static unsigned int pmcraid_major;
79 static struct class *pmcraid_class;
80 DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
81
82 /*
83  * Module parameters
84  */
85 MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
86 MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(PMCRAID_DRIVER_VERSION);
89
90 module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
91 MODULE_PARM_DESC(log_level,
92                  "Enables firmware error code logging, default :1 high-severity"
93                  " errors, 2: all errors including high-severity errors,"
94                  " 0: disables logging");
95
96 module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
97 MODULE_PARM_DESC(debug,
98                  "Enable driver verbose message logging. Set 1 to enable."
99                  "(default: 0)");
100
101 module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
102 MODULE_PARM_DESC(disable_aen,
103                  "Disable driver aen notifications to apps. Set 1 to disable."
104                  "(default: 0)");
105
106 /* chip specific constants for PMC MaxRAID controllers (same for
107  * 0x5220 and 0x8010
108  */
109 static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
110         {
111          .ioastatus = 0x0,
112          .ioarrin = 0x00040,
113          .mailbox = 0x7FC30,
114          .global_intr_mask = 0x00034,
115          .ioa_host_intr = 0x0009C,
116          .ioa_host_intr_clr = 0x000A0,
117          .ioa_host_msix_intr = 0x7FC40,
118          .ioa_host_mask = 0x7FC28,
119          .ioa_host_mask_clr = 0x7FC28,
120          .host_ioa_intr = 0x00020,
121          .host_ioa_intr_clr = 0x00020,
122          .transop_timeout = 300
123          }
124 };
125
126 /*
127  * PCI device ids supported by pmcraid driver
128  */
129 static struct pci_device_id pmcraid_pci_table[] __devinitdata = {
130         { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
131           0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
132         },
133         {}
134 };
135
136 MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
137
138
139
140 /**
141  * pmcraid_slave_alloc - Prepare for commands to a device
142  * @scsi_dev: scsi device struct
143  *
144  * This function is called by mid-layer prior to sending any command to the new
145  * device. Stores resource entry details of the device in scsi_device struct.
146  * Queuecommand uses the resource handle and other details to fill up IOARCB
147  * while sending commands to the device.
148  *
149  * Return value:
150  *        0 on success / -ENXIO if device does not exist
151  */
152 static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
153 {
154         struct pmcraid_resource_entry *temp, *res = NULL;
155         struct pmcraid_instance *pinstance;
156         u8 target, bus, lun;
157         unsigned long lock_flags;
158         int rc = -ENXIO;
159         u16 fw_version;
160
161         pinstance = shost_priv(scsi_dev->host);
162
163         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
164
165         /* Driver exposes VSET and GSCSI resources only; all other device types
166          * are not exposed. Resource list is synchronized using resource lock
167          * so any traversal or modifications to the list should be done inside
168          * this lock
169          */
170         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
171         list_for_each_entry(temp, &pinstance->used_res_q, queue) {
172
173                 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
174                 if (RES_IS_VSET(temp->cfg_entry)) {
175                         if (fw_version <= PMCRAID_FW_VERSION_1)
176                                 target = temp->cfg_entry.unique_flags1;
177                         else
178                                 target = temp->cfg_entry.array_id & 0xFF;
179
180                         if (target > PMCRAID_MAX_VSET_TARGETS)
181                                 continue;
182                         bus = PMCRAID_VSET_BUS_ID;
183                         lun = 0;
184                 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
185                         target = RES_TARGET(temp->cfg_entry.resource_address);
186                         bus = PMCRAID_PHYS_BUS_ID;
187                         lun = RES_LUN(temp->cfg_entry.resource_address);
188                 } else {
189                         continue;
190                 }
191
192                 if (bus == scsi_dev->channel &&
193                     target == scsi_dev->id &&
194                     lun == scsi_dev->lun) {
195                         res = temp;
196                         break;
197                 }
198         }
199
200         if (res) {
201                 res->scsi_dev = scsi_dev;
202                 scsi_dev->hostdata = res;
203                 res->change_detected = 0;
204                 atomic_set(&res->read_failures, 0);
205                 atomic_set(&res->write_failures, 0);
206                 rc = 0;
207         }
208         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
209         return rc;
210 }
211
212 /**
213  * pmcraid_slave_configure - Configures a SCSI device
214  * @scsi_dev: scsi device struct
215  *
216  * This fucntion is executed by SCSI mid layer just after a device is first
217  * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
218  * timeout value (default 30s) will be over-written to a higher value (60s)
219  * and max_sectors value will be over-written to 512. It also sets queue depth
220  * to host->cmd_per_lun value
221  *
222  * Return value:
223  *        0 on success
224  */
225 static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
226 {
227         struct pmcraid_resource_entry *res = scsi_dev->hostdata;
228
229         if (!res)
230                 return 0;
231
232         /* LLD exposes VSETs and Enclosure devices only */
233         if (RES_IS_GSCSI(res->cfg_entry) &&
234             scsi_dev->type != TYPE_ENCLOSURE)
235                 return -ENXIO;
236
237         pmcraid_info("configuring %x:%x:%x:%x\n",
238                      scsi_dev->host->unique_id,
239                      scsi_dev->channel,
240                      scsi_dev->id,
241                      scsi_dev->lun);
242
243         if (RES_IS_GSCSI(res->cfg_entry)) {
244                 scsi_dev->allow_restart = 1;
245         } else if (RES_IS_VSET(res->cfg_entry)) {
246                 scsi_dev->allow_restart = 1;
247                 blk_queue_rq_timeout(scsi_dev->request_queue,
248                                      PMCRAID_VSET_IO_TIMEOUT);
249                 blk_queue_max_hw_sectors(scsi_dev->request_queue,
250                                       PMCRAID_VSET_MAX_SECTORS);
251         }
252
253         if (scsi_dev->tagged_supported &&
254             (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
255                 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
256                 scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
257                                         scsi_dev->host->cmd_per_lun);
258         } else {
259                 scsi_adjust_queue_depth(scsi_dev, 0,
260                                         scsi_dev->host->cmd_per_lun);
261         }
262
263         return 0;
264 }
265
266 /**
267  * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
268  *
269  * @scsi_dev: scsi device struct
270  *
271  * This is called by mid-layer before removing a device. Pointer assignments
272  * done in pmcraid_slave_alloc will be reset to NULL here.
273  *
274  * Return value
275  *   none
276  */
277 static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
278 {
279         struct pmcraid_resource_entry *res;
280
281         res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
282
283         if (res)
284                 res->scsi_dev = NULL;
285
286         scsi_dev->hostdata = NULL;
287 }
288
289 /**
290  * pmcraid_change_queue_depth - Change the device's queue depth
291  * @scsi_dev: scsi device struct
292  * @depth: depth to set
293  * @reason: calling context
294  *
295  * Return value
296  *      actual depth set
297  */
298 static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
299                                       int reason)
300 {
301         if (reason != SCSI_QDEPTH_DEFAULT)
302                 return -EOPNOTSUPP;
303
304         if (depth > PMCRAID_MAX_CMD_PER_LUN)
305                 depth = PMCRAID_MAX_CMD_PER_LUN;
306
307         scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
308
309         return scsi_dev->queue_depth;
310 }
311
312 /**
313  * pmcraid_change_queue_type - Change the device's queue type
314  * @scsi_dev: scsi device struct
315  * @tag: type of tags to use
316  *
317  * Return value:
318  *      actual queue type set
319  */
320 static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
321 {
322         struct pmcraid_resource_entry *res;
323
324         res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
325
326         if ((res) && scsi_dev->tagged_supported &&
327             (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
328                 scsi_set_tag_type(scsi_dev, tag);
329
330                 if (tag)
331                         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
332                 else
333                         scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
334         } else
335                 tag = 0;
336
337         return tag;
338 }
339
340
341 /**
342  * pmcraid_init_cmdblk - initializes a command block
343  *
344  * @cmd: pointer to struct pmcraid_cmd to be initialized
345  * @index: if >=0 first time initialization; otherwise reinitialization
346  *
347  * Return Value
348  *       None
349  */
350 void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
351 {
352         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
353         dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
354
355         if (index >= 0) {
356                 /* first time initialization (called from  probe) */
357                 u32 ioasa_offset =
358                         offsetof(struct pmcraid_control_block, ioasa);
359
360                 cmd->index = index;
361                 ioarcb->response_handle = cpu_to_le32(index << 2);
362                 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
363                 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
364                 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
365         } else {
366                 /* re-initialization of various lengths, called once command is
367                  * processed by IOA
368                  */
369                 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
370                 ioarcb->hrrq_id = 0;
371                 ioarcb->request_flags0 = 0;
372                 ioarcb->request_flags1 = 0;
373                 ioarcb->cmd_timeout = 0;
374                 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
375                 ioarcb->ioadl_bus_addr = 0;
376                 ioarcb->ioadl_length = 0;
377                 ioarcb->data_transfer_length = 0;
378                 ioarcb->add_cmd_param_length = 0;
379                 ioarcb->add_cmd_param_offset = 0;
380                 cmd->ioa_cb->ioasa.ioasc = 0;
381                 cmd->ioa_cb->ioasa.residual_data_length = 0;
382                 cmd->time_left = 0;
383         }
384
385         cmd->cmd_done = NULL;
386         cmd->scsi_cmd = NULL;
387         cmd->release = 0;
388         cmd->completion_req = 0;
389         cmd->sense_buffer = 0;
390         cmd->sense_buffer_dma = 0;
391         cmd->dma_handle = 0;
392         init_timer(&cmd->timer);
393 }
394
395 /**
396  * pmcraid_reinit_cmdblk - reinitialize a command block
397  *
398  * @cmd: pointer to struct pmcraid_cmd to be reinitialized
399  *
400  * Return Value
401  *       None
402  */
403 static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
404 {
405         pmcraid_init_cmdblk(cmd, -1);
406 }
407
408 /**
409  * pmcraid_get_free_cmd - get a free cmd block from command block pool
410  * @pinstance: adapter instance structure
411  *
412  * Return Value:
413  *      returns pointer to cmd block or NULL if no blocks are available
414  */
415 static struct pmcraid_cmd *pmcraid_get_free_cmd(
416         struct pmcraid_instance *pinstance
417 )
418 {
419         struct pmcraid_cmd *cmd = NULL;
420         unsigned long lock_flags;
421
422         /* free cmd block list is protected by free_pool_lock */
423         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
424
425         if (!list_empty(&pinstance->free_cmd_pool)) {
426                 cmd = list_entry(pinstance->free_cmd_pool.next,
427                                  struct pmcraid_cmd, free_list);
428                 list_del(&cmd->free_list);
429         }
430         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
431
432         /* Initialize the command block before giving it the caller */
433         if (cmd != NULL)
434                 pmcraid_reinit_cmdblk(cmd);
435         return cmd;
436 }
437
438 /**
439  * pmcraid_return_cmd - return a completed command block back into free pool
440  * @cmd: pointer to the command block
441  *
442  * Return Value:
443  *      nothing
444  */
445 void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
446 {
447         struct pmcraid_instance *pinstance = cmd->drv_inst;
448         unsigned long lock_flags;
449
450         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
451         list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
452         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
453 }
454
455 /**
456  * pmcraid_read_interrupts -  reads IOA interrupts
457  *
458  * @pinstance: pointer to adapter instance structure
459  *
460  * Return value
461  *       interrupts read from IOA
462  */
463 static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
464 {
465         return (pinstance->interrupt_mode) ?
466                 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
467                 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
468 }
469
470 /**
471  * pmcraid_disable_interrupts - Masks and clears all specified interrupts
472  *
473  * @pinstance: pointer to per adapter instance structure
474  * @intrs: interrupts to disable
475  *
476  * Return Value
477  *       None
478  */
479 static void pmcraid_disable_interrupts(
480         struct pmcraid_instance *pinstance,
481         u32 intrs
482 )
483 {
484         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
485         u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
486
487         iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
488         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
489         ioread32(pinstance->int_regs.global_interrupt_mask_reg);
490
491         if (!pinstance->interrupt_mode) {
492                 iowrite32(intrs,
493                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
494                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
495         }
496 }
497
498 /**
499  * pmcraid_enable_interrupts - Enables specified interrupts
500  *
501  * @pinstance: pointer to per adapter instance structure
502  * @intr: interrupts to enable
503  *
504  * Return Value
505  *       None
506  */
507 static void pmcraid_enable_interrupts(
508         struct pmcraid_instance *pinstance,
509         u32 intrs
510 )
511 {
512         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
513         u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
514
515         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
516
517         if (!pinstance->interrupt_mode) {
518                 iowrite32(~intrs,
519                          pinstance->int_regs.ioa_host_interrupt_mask_reg);
520                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
521         }
522
523         pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
524                 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
525                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
526 }
527
528 /**
529  * pmcraid_clr_trans_op - clear trans to op interrupt
530  *
531  * @pinstance: pointer to per adapter instance structure
532  *
533  * Return Value
534  *       None
535  */
536 static void pmcraid_clr_trans_op(
537         struct pmcraid_instance *pinstance
538 )
539 {
540         unsigned long lock_flags;
541
542         if (!pinstance->interrupt_mode) {
543                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
544                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
545                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
546                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
547                         pinstance->int_regs.ioa_host_interrupt_clr_reg);
548                 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
549         }
550
551         if (pinstance->reset_cmd != NULL) {
552                 del_timer(&pinstance->reset_cmd->timer);
553                 spin_lock_irqsave(
554                         pinstance->host->host_lock, lock_flags);
555                 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
556                 spin_unlock_irqrestore(
557                         pinstance->host->host_lock, lock_flags);
558         }
559 }
560
561 /**
562  * pmcraid_reset_type - Determine the required reset type
563  * @pinstance: pointer to adapter instance structure
564  *
565  * IOA requires hard reset if any of the following conditions is true.
566  * 1. If HRRQ valid interrupt is not masked
567  * 2. IOA reset alert doorbell is set
568  * 3. If there are any error interrupts
569  */
570 static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
571 {
572         u32 mask;
573         u32 intrs;
574         u32 alerts;
575
576         mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
577         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
578         alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
579
580         if ((mask & INTRS_HRRQ_VALID) == 0 ||
581             (alerts & DOORBELL_IOA_RESET_ALERT) ||
582             (intrs & PMCRAID_ERROR_INTERRUPTS)) {
583                 pmcraid_info("IOA requires hard reset\n");
584                 pinstance->ioa_hard_reset = 1;
585         }
586
587         /* If unit check is active, trigger the dump */
588         if (intrs & INTRS_IOA_UNIT_CHECK)
589                 pinstance->ioa_unit_check = 1;
590 }
591
592 /**
593  * pmcraid_bist_done - completion function for PCI BIST
594  * @cmd: pointer to reset command
595  * Return Value
596  *      none
597  */
598
599 static void pmcraid_ioa_reset(struct pmcraid_cmd *);
600
601 static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
602 {
603         struct pmcraid_instance *pinstance = cmd->drv_inst;
604         unsigned long lock_flags;
605         int rc;
606         u16 pci_reg;
607
608         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
609
610         /* If PCI config space can't be accessed wait for another two secs */
611         if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
612             cmd->time_left > 0) {
613                 pmcraid_info("BIST not complete, waiting another 2 secs\n");
614                 cmd->timer.expires = jiffies + cmd->time_left;
615                 cmd->time_left = 0;
616                 cmd->timer.data = (unsigned long)cmd;
617                 cmd->timer.function =
618                         (void (*)(unsigned long))pmcraid_bist_done;
619                 add_timer(&cmd->timer);
620         } else {
621                 cmd->time_left = 0;
622                 pmcraid_info("BIST is complete, proceeding with reset\n");
623                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
624                 pmcraid_ioa_reset(cmd);
625                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
626         }
627 }
628
629 /**
630  * pmcraid_start_bist - starts BIST
631  * @cmd: pointer to reset cmd
632  * Return Value
633  *   none
634  */
635 static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
636 {
637         struct pmcraid_instance *pinstance = cmd->drv_inst;
638         u32 doorbells, intrs;
639
640         /* proceed with bist and wait for 2 seconds */
641         iowrite32(DOORBELL_IOA_START_BIST,
642                 pinstance->int_regs.host_ioa_interrupt_reg);
643         doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
644         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
645         pmcraid_info("doorbells after start bist: %x intrs: %x\n",
646                       doorbells, intrs);
647
648         cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
649         cmd->timer.data = (unsigned long)cmd;
650         cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
651         cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
652         add_timer(&cmd->timer);
653 }
654
655 /**
656  * pmcraid_reset_alert_done - completion routine for reset_alert
657  * @cmd: pointer to command block used in reset sequence
658  * Return value
659  *  None
660  */
661 static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
662 {
663         struct pmcraid_instance *pinstance = cmd->drv_inst;
664         u32 status = ioread32(pinstance->ioa_status);
665         unsigned long lock_flags;
666
667         /* if the critical operation in progress bit is set or the wait times
668          * out, invoke reset engine to proceed with hard reset. If there is
669          * some more time to wait, restart the timer
670          */
671         if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
672             cmd->time_left <= 0) {
673                 pmcraid_info("critical op is reset proceeding with reset\n");
674                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
675                 pmcraid_ioa_reset(cmd);
676                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
677         } else {
678                 pmcraid_info("critical op is not yet reset waiting again\n");
679                 /* restart timer if some more time is available to wait */
680                 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
681                 cmd->timer.data = (unsigned long)cmd;
682                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
683                 cmd->timer.function =
684                         (void (*)(unsigned long))pmcraid_reset_alert_done;
685                 add_timer(&cmd->timer);
686         }
687 }
688
689 /**
690  * pmcraid_reset_alert - alerts IOA for a possible reset
691  * @cmd : command block to be used for reset sequence.
692  *
693  * Return Value
694  *      returns 0 if pci config-space is accessible and RESET_DOORBELL is
695  *      successfully written to IOA. Returns non-zero in case pci_config_space
696  *      is not accessible
697  */
698 static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
699 static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
700 {
701         struct pmcraid_instance *pinstance = cmd->drv_inst;
702         u32 doorbells;
703         int rc;
704         u16 pci_reg;
705
706         /* If we are able to access IOA PCI config space, alert IOA that we are
707          * going to reset it soon. This enables IOA to preserv persistent error
708          * data if any. In case memory space is not accessible, proceed with
709          * BIST or slot_reset
710          */
711         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
712         if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
713
714                 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
715                  * reset IOA doesn't generate any interrupts when CRITICAL
716                  * OPERATION bit is reset. A timer is started to wait for this
717                  * bit to be reset.
718                  */
719                 cmd->time_left = PMCRAID_RESET_TIMEOUT;
720                 cmd->timer.data = (unsigned long)cmd;
721                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
722                 cmd->timer.function =
723                         (void (*)(unsigned long))pmcraid_reset_alert_done;
724                 add_timer(&cmd->timer);
725
726                 iowrite32(DOORBELL_IOA_RESET_ALERT,
727                         pinstance->int_regs.host_ioa_interrupt_reg);
728                 doorbells =
729                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
730                 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
731         } else {
732                 pmcraid_info("PCI config is not accessible starting BIST\n");
733                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
734                 pmcraid_start_bist(cmd);
735         }
736 }
737
738 /**
739  * pmcraid_timeout_handler -  Timeout handler for internally generated ops
740  *
741  * @cmd : pointer to command structure, that got timedout
742  *
743  * This function blocks host requests and initiates an adapter reset.
744  *
745  * Return value:
746  *   None
747  */
748 static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
749 {
750         struct pmcraid_instance *pinstance = cmd->drv_inst;
751         unsigned long lock_flags;
752
753         dev_info(&pinstance->pdev->dev,
754                 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
755                 cmd->ioa_cb->ioarcb.cdb[0]);
756
757         /* Command timeouts result in hard reset sequence. The command that got
758          * timed out may be the one used as part of reset sequence. In this
759          * case restart reset sequence using the same command block even if
760          * reset is in progress. Otherwise fail this command and get a free
761          * command block to restart the reset sequence.
762          */
763         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
764         if (!pinstance->ioa_reset_in_progress) {
765                 pinstance->ioa_reset_attempts = 0;
766                 cmd = pmcraid_get_free_cmd(pinstance);
767
768                 /* If we are out of command blocks, just return here itself.
769                  * Some other command's timeout handler can do the reset job
770                  */
771                 if (cmd == NULL) {
772                         spin_unlock_irqrestore(pinstance->host->host_lock,
773                                                lock_flags);
774                         pmcraid_err("no free cmnd block for timeout handler\n");
775                         return;
776                 }
777
778                 pinstance->reset_cmd = cmd;
779                 pinstance->ioa_reset_in_progress = 1;
780         } else {
781                 pmcraid_info("reset is already in progress\n");
782
783                 if (pinstance->reset_cmd != cmd) {
784                         /* This command should have been given to IOA, this
785                          * command will be completed by fail_outstanding_cmds
786                          * anyway
787                          */
788                         pmcraid_err("cmd is pending but reset in progress\n");
789                 }
790
791                 /* If this command was being used as part of the reset
792                  * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
793                  * causes fail_outstanding_commands not to return the command
794                  * block back to free pool
795                  */
796                 if (cmd == pinstance->reset_cmd)
797                         cmd->cmd_done = pmcraid_ioa_reset;
798         }
799
800         /* Notify apps of important IOA bringup/bringdown sequences */
801         if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
802             pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
803                 pmcraid_notify_ioastate(pinstance,
804                                         PMC_DEVICE_EVENT_RESET_START);
805
806         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
807         scsi_block_requests(pinstance->host);
808         pmcraid_reset_alert(cmd);
809         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
810 }
811
812 /**
813  * pmcraid_internal_done - completion routine for internally generated cmds
814  *
815  * @cmd: command that got response from IOA
816  *
817  * Return Value:
818  *       none
819  */
820 static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
821 {
822         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
823                      cmd->ioa_cb->ioarcb.cdb[0],
824                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
825
826         /* Some of the internal commands are sent with callers blocking for the
827          * response. Same will be indicated as part of cmd->completion_req
828          * field. Response path needs to wake up any waiters waiting for cmd
829          * completion if this flag is set.
830          */
831         if (cmd->completion_req) {
832                 cmd->completion_req = 0;
833                 complete(&cmd->wait_for_completion);
834         }
835
836         /* most of the internal commands are completed by caller itself, so
837          * no need to return the command block back to free pool until we are
838          * required to do so (e.g once done with initialization).
839          */
840         if (cmd->release) {
841                 cmd->release = 0;
842                 pmcraid_return_cmd(cmd);
843         }
844 }
845
846 /**
847  * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
848  *
849  * @cmd: command that got response from IOA
850  *
851  * This routine is called after driver re-reads configuration table due to a
852  * lost CCN. It returns the command block back to free pool and schedules
853  * worker thread to add/delete devices into the system.
854  *
855  * Return Value:
856  *       none
857  */
858 static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
859 {
860         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
861                      cmd->ioa_cb->ioarcb.cdb[0],
862                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
863
864         if (cmd->release) {
865                 cmd->release = 0;
866                 pmcraid_return_cmd(cmd);
867         }
868         pmcraid_info("scheduling worker for config table reinitialization\n");
869         schedule_work(&cmd->drv_inst->worker_q);
870 }
871
872 /**
873  * pmcraid_erp_done - Process completion of SCSI error response from device
874  * @cmd: pmcraid_command
875  *
876  * This function copies the sense buffer into the scsi_cmd struct and completes
877  * scsi_cmd by calling scsi_done function.
878  *
879  * Return value:
880  *  none
881  */
882 static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
883 {
884         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
885         struct pmcraid_instance *pinstance = cmd->drv_inst;
886         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
887
888         if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
889                 scsi_cmd->result |= (DID_ERROR << 16);
890                 scmd_printk(KERN_INFO, scsi_cmd,
891                             "command CDB[0] = %x failed with IOASC: 0x%08X\n",
892                             cmd->ioa_cb->ioarcb.cdb[0], ioasc);
893         }
894
895         /* if we had allocated sense buffers for request sense, copy the sense
896          * release the buffers
897          */
898         if (cmd->sense_buffer != NULL) {
899                 memcpy(scsi_cmd->sense_buffer,
900                        cmd->sense_buffer,
901                        SCSI_SENSE_BUFFERSIZE);
902                 pci_free_consistent(pinstance->pdev,
903                                     SCSI_SENSE_BUFFERSIZE,
904                                     cmd->sense_buffer, cmd->sense_buffer_dma);
905                 cmd->sense_buffer = NULL;
906                 cmd->sense_buffer_dma = 0;
907         }
908
909         scsi_dma_unmap(scsi_cmd);
910         pmcraid_return_cmd(cmd);
911         scsi_cmd->scsi_done(scsi_cmd);
912 }
913
914 /**
915  * pmcraid_fire_command - sends an IOA command to adapter
916  *
917  * This function adds the given block into pending command list
918  * and returns without waiting
919  *
920  * @cmd : command to be sent to the device
921  *
922  * Return Value
923  *      None
924  */
925 static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
926 {
927         struct pmcraid_instance *pinstance = cmd->drv_inst;
928         unsigned long lock_flags;
929
930         /* Add this command block to pending cmd pool. We do this prior to
931          * writting IOARCB to ioarrin because IOA might complete the command
932          * by the time we are about to add it to the list. Response handler
933          * (isr/tasklet) looks for cmd block in the pending pending list.
934          */
935         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
936         list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
937         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
938         atomic_inc(&pinstance->outstanding_cmds);
939
940         /* driver writes lower 32-bit value of IOARCB address only */
941         mb();
942         iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
943                   pinstance->ioarrin);
944 }
945
946 /**
947  * pmcraid_send_cmd - fires a command to IOA
948  *
949  * This function also sets up timeout function, and command completion
950  * function
951  *
952  * @cmd: pointer to the command block to be fired to IOA
953  * @cmd_done: command completion function, called once IOA responds
954  * @timeout: timeout to wait for this command completion
955  * @timeout_func: timeout handler
956  *
957  * Return value
958  *   none
959  */
960 static void pmcraid_send_cmd(
961         struct pmcraid_cmd *cmd,
962         void (*cmd_done) (struct pmcraid_cmd *),
963         unsigned long timeout,
964         void (*timeout_func) (struct pmcraid_cmd *)
965 )
966 {
967         /* initialize done function */
968         cmd->cmd_done = cmd_done;
969
970         if (timeout_func) {
971                 /* setup timeout handler */
972                 cmd->timer.data = (unsigned long)cmd;
973                 cmd->timer.expires = jiffies + timeout;
974                 cmd->timer.function = (void (*)(unsigned long))timeout_func;
975                 add_timer(&cmd->timer);
976         }
977
978         /* fire the command to IOA */
979         _pmcraid_fire_command(cmd);
980 }
981
982 /**
983  * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
984  * @cmd: pointer to the command block used for sending IOA shutdown command
985  *
986  * Return value
987  *  None
988  */
989 static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
990 {
991         struct pmcraid_instance *pinstance = cmd->drv_inst;
992         unsigned long lock_flags;
993
994         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
995         pmcraid_ioa_reset(cmd);
996         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
997 }
998
999 /**
1000  * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
1001  *
1002  * @cmd: pointer to the command block used as part of reset sequence
1003  *
1004  * Return Value
1005  *  None
1006  */
1007 static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
1008 {
1009         pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
1010                      cmd->ioa_cb->ioarcb.cdb[0],
1011                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1012
1013         /* Note that commands sent during reset require next command to be sent
1014          * to IOA. Hence reinit the done function as well as timeout function
1015          */
1016         pmcraid_reinit_cmdblk(cmd);
1017         cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
1018         cmd->ioa_cb->ioarcb.resource_handle =
1019                 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1020         cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
1021         cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
1022
1023         /* fire shutdown command to hardware. */
1024         pmcraid_info("firing normal shutdown command (%d) to IOA\n",
1025                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
1026
1027         pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
1028
1029         pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
1030                          PMCRAID_SHUTDOWN_TIMEOUT,
1031                          pmcraid_timeout_handler);
1032 }
1033
1034 /**
1035  * pmcraid_get_fwversion_done - completion function for get_fwversion
1036  *
1037  * @cmd: pointer to command block used to send INQUIRY command
1038  *
1039  * Return Value
1040  *      none
1041  */
1042 static void pmcraid_querycfg(struct pmcraid_cmd *);
1043
1044 static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1045 {
1046         struct pmcraid_instance *pinstance = cmd->drv_inst;
1047         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1048         unsigned long lock_flags;
1049
1050         /* configuration table entry size depends on firmware version. If fw
1051          * version is not known, it is not possible to interpret IOA config
1052          * table
1053          */
1054         if (ioasc) {
1055                 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1056                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1057                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1058                 pmcraid_reset_alert(cmd);
1059                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1060         } else  {
1061                 pmcraid_querycfg(cmd);
1062         }
1063 }
1064
1065 /**
1066  * pmcraid_get_fwversion - reads firmware version information
1067  *
1068  * @cmd: pointer to command block used to send INQUIRY command
1069  *
1070  * Return Value
1071  *      none
1072  */
1073 static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1074 {
1075         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1076         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1077         struct pmcraid_instance *pinstance = cmd->drv_inst;
1078         u16 data_size = sizeof(struct pmcraid_inquiry_data);
1079
1080         pmcraid_reinit_cmdblk(cmd);
1081         ioarcb->request_type = REQ_TYPE_SCSI;
1082         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1083         ioarcb->cdb[0] = INQUIRY;
1084         ioarcb->cdb[1] = 1;
1085         ioarcb->cdb[2] = 0xD0;
1086         ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1087         ioarcb->cdb[4] = data_size & 0xFF;
1088
1089         /* Since entire inquiry data it can be part of IOARCB itself
1090          */
1091         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1092                                         offsetof(struct pmcraid_ioarcb,
1093                                                 add_data.u.ioadl[0]));
1094         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1095         ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1096
1097         ioarcb->request_flags0 |= NO_LINK_DESCS;
1098         ioarcb->data_transfer_length = cpu_to_le32(data_size);
1099         ioadl = &(ioarcb->add_data.u.ioadl[0]);
1100         ioadl->flags = IOADL_FLAGS_LAST_DESC;
1101         ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1102         ioadl->data_len = cpu_to_le32(data_size);
1103
1104         pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1105                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1106 }
1107
1108 /**
1109  * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1110  * @cmd: pointer to command block to be used for identify hrrq
1111  *
1112  * Return Value
1113  *       none
1114  */
1115 static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1116 {
1117         struct pmcraid_instance *pinstance = cmd->drv_inst;
1118         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1119         int index = cmd->hrrq_index;
1120         __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1121         u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1122         void (*done_function)(struct pmcraid_cmd *);
1123
1124         pmcraid_reinit_cmdblk(cmd);
1125         cmd->hrrq_index = index + 1;
1126
1127         if (cmd->hrrq_index < pinstance->num_hrrq) {
1128                 done_function = pmcraid_identify_hrrq;
1129         } else {
1130                 cmd->hrrq_index = 0;
1131                 done_function = pmcraid_get_fwversion;
1132         }
1133
1134         /* Initialize ioarcb */
1135         ioarcb->request_type = REQ_TYPE_IOACMD;
1136         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1137
1138         /* initialize the hrrq number where IOA will respond to this command */
1139         ioarcb->hrrq_id = index;
1140         ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1141         ioarcb->cdb[1] = index;
1142
1143         /* IOA expects 64-bit pci address to be written in B.E format
1144          * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1145          */
1146         pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1147                      hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1148
1149         memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1150         memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1151
1152         /* Subsequent commands require HRRQ identification to be successful.
1153          * Note that this gets called even during reset from SCSI mid-layer
1154          * or tasklet
1155          */
1156         pmcraid_send_cmd(cmd, done_function,
1157                          PMCRAID_INTERNAL_TIMEOUT,
1158                          pmcraid_timeout_handler);
1159 }
1160
1161 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1162 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1163
1164 /**
1165  * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1166  *
1167  * @cmd: initialized command block pointer
1168  *
1169  * Return Value
1170  *   none
1171  */
1172 static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1173 {
1174         if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1175                 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1176         else
1177                 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1178
1179         pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1180 }
1181
1182 /**
1183  * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1184  *
1185  * @pinstance: pointer to adapter instance structure
1186  * @type: HCAM type
1187  *
1188  * Return Value
1189  *   pointer to initialized pmcraid_cmd structure or NULL
1190  */
1191 static struct pmcraid_cmd *pmcraid_init_hcam
1192 (
1193         struct pmcraid_instance *pinstance,
1194         u8 type
1195 )
1196 {
1197         struct pmcraid_cmd *cmd;
1198         struct pmcraid_ioarcb *ioarcb;
1199         struct pmcraid_ioadl_desc *ioadl;
1200         struct pmcraid_hostrcb *hcam;
1201         void (*cmd_done) (struct pmcraid_cmd *);
1202         dma_addr_t dma;
1203         int rcb_size;
1204
1205         cmd = pmcraid_get_free_cmd(pinstance);
1206
1207         if (!cmd) {
1208                 pmcraid_err("no free command blocks for hcam\n");
1209                 return cmd;
1210         }
1211
1212         if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1213                 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1214                 cmd_done = pmcraid_process_ccn;
1215                 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1216                 hcam = &pinstance->ccn;
1217         } else {
1218                 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1219                 cmd_done = pmcraid_process_ldn;
1220                 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1221                 hcam = &pinstance->ldn;
1222         }
1223
1224         /* initialize command pointer used for HCAM registration */
1225         hcam->cmd = cmd;
1226
1227         ioarcb = &cmd->ioa_cb->ioarcb;
1228         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1229                                         offsetof(struct pmcraid_ioarcb,
1230                                                 add_data.u.ioadl[0]));
1231         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1232         ioadl = ioarcb->add_data.u.ioadl;
1233
1234         /* Initialize ioarcb */
1235         ioarcb->request_type = REQ_TYPE_HCAM;
1236         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1237         ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1238         ioarcb->cdb[1] = type;
1239         ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1240         ioarcb->cdb[8] = (rcb_size) & 0xFF;
1241
1242         ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1243
1244         ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1245         ioadl[0].data_len = cpu_to_le32(rcb_size);
1246         ioadl[0].address = cpu_to_le32(dma);
1247
1248         cmd->cmd_done = cmd_done;
1249         return cmd;
1250 }
1251
1252 /**
1253  * pmcraid_send_hcam - Send an HCAM to IOA
1254  * @pinstance: ioa config struct
1255  * @type: HCAM type
1256  *
1257  * This function will send a Host Controlled Async command to IOA.
1258  *
1259  * Return value:
1260  *      none
1261  */
1262 static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1263 {
1264         struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1265         pmcraid_send_hcam_cmd(cmd);
1266 }
1267
1268
1269 /**
1270  * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1271  *
1272  * @cmd: pointer to cmd that is used as cancelling command
1273  * @cmd_to_cancel: pointer to the command that needs to be cancelled
1274  */
1275 static void pmcraid_prepare_cancel_cmd(
1276         struct pmcraid_cmd *cmd,
1277         struct pmcraid_cmd *cmd_to_cancel
1278 )
1279 {
1280         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1281         __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1282
1283         /* Get the resource handle to where the command to be aborted has been
1284          * sent.
1285          */
1286         ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1287         ioarcb->request_type = REQ_TYPE_IOACMD;
1288         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1289         ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1290
1291         /* IOARCB address of the command to be cancelled is given in
1292          * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1293          * IOARCB address are not masked.
1294          */
1295         ioarcb_addr = cpu_to_be64(ioarcb_addr);
1296         memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1297 }
1298
1299 /**
1300  * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1301  *
1302  * @cmd: command to be used as cancelling command
1303  * @type: HCAM type
1304  * @cmd_done: op done function for the cancelling command
1305  */
1306 static void pmcraid_cancel_hcam(
1307         struct pmcraid_cmd *cmd,
1308         u8 type,
1309         void (*cmd_done) (struct pmcraid_cmd *)
1310 )
1311 {
1312         struct pmcraid_instance *pinstance;
1313         struct pmcraid_hostrcb  *hcam;
1314
1315         pinstance = cmd->drv_inst;
1316         hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1317                 &pinstance->ldn : &pinstance->ccn;
1318
1319         /* prepare for cancelling previous hcam command. If the HCAM is
1320          * currently not pending with IOA, we would have hcam->cmd as non-null
1321          */
1322         if (hcam->cmd == NULL)
1323                 return;
1324
1325         pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1326
1327         /* writing to IOARRIN must be protected by host_lock, as mid-layer
1328          * schedule queuecommand while we are doing this
1329          */
1330         pmcraid_send_cmd(cmd, cmd_done,
1331                          PMCRAID_INTERNAL_TIMEOUT,
1332                          pmcraid_timeout_handler);
1333 }
1334
1335 /**
1336  * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1337  *
1338  * @cmd: command block to be used for cancelling the HCAM
1339  */
1340 static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1341 {
1342         pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1343                      cmd->ioa_cb->ioarcb.cdb[0],
1344                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1345
1346         pmcraid_reinit_cmdblk(cmd);
1347
1348         pmcraid_cancel_hcam(cmd,
1349                             PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1350                             pmcraid_ioa_shutdown);
1351 }
1352
1353 /**
1354  * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1355  *
1356  * @cmd: command block to be used for cancelling the HCAM
1357  */
1358 static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1359 {
1360         pmcraid_cancel_hcam(cmd,
1361                             PMCRAID_HCAM_CODE_LOG_DATA,
1362                             pmcraid_cancel_ccn);
1363 }
1364
1365 /**
1366  * pmcraid_expose_resource - check if the resource can be exposed to OS
1367  *
1368  * @fw_version: firmware version code
1369  * @cfgte: pointer to configuration table entry of the resource
1370  *
1371  * Return value:
1372  *      true if resource can be added to midlayer, false(0) otherwise
1373  */
1374 static int pmcraid_expose_resource(u16 fw_version,
1375                                    struct pmcraid_config_table_entry *cfgte)
1376 {
1377         int retval = 0;
1378
1379         if (cfgte->resource_type == RES_TYPE_VSET) {
1380                 if (fw_version <= PMCRAID_FW_VERSION_1)
1381                         retval = ((cfgte->unique_flags1 & 0x80) == 0);
1382                 else
1383                         retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1384                                   (cfgte->unique_flags1 & 0x80) == 0);
1385
1386         } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1387                 retval = (RES_BUS(cfgte->resource_address) !=
1388                                 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1389         return retval;
1390 }
1391
1392 /* attributes supported by pmcraid_event_family */
1393 enum {
1394         PMCRAID_AEN_ATTR_UNSPEC,
1395         PMCRAID_AEN_ATTR_EVENT,
1396         __PMCRAID_AEN_ATTR_MAX,
1397 };
1398 #define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1399
1400 /* commands supported by pmcraid_event_family */
1401 enum {
1402         PMCRAID_AEN_CMD_UNSPEC,
1403         PMCRAID_AEN_CMD_EVENT,
1404         __PMCRAID_AEN_CMD_MAX,
1405 };
1406 #define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1407
1408 static struct genl_family pmcraid_event_family = {
1409         .id = GENL_ID_GENERATE,
1410         .name = "pmcraid",
1411         .version = 1,
1412         .maxattr = PMCRAID_AEN_ATTR_MAX
1413 };
1414
1415 /**
1416  * pmcraid_netlink_init - registers pmcraid_event_family
1417  *
1418  * Return value:
1419  *      0 if the pmcraid_event_family is successfully registered
1420  *      with netlink generic, non-zero otherwise
1421  */
1422 static int pmcraid_netlink_init(void)
1423 {
1424         int result;
1425
1426         result = genl_register_family(&pmcraid_event_family);
1427
1428         if (result)
1429                 return result;
1430
1431         pmcraid_info("registered NETLINK GENERIC group: %d\n",
1432                      pmcraid_event_family.id);
1433
1434         return result;
1435 }
1436
1437 /**
1438  * pmcraid_netlink_release - unregisters pmcraid_event_family
1439  *
1440  * Return value:
1441  *      none
1442  */
1443 static void pmcraid_netlink_release(void)
1444 {
1445         genl_unregister_family(&pmcraid_event_family);
1446 }
1447
1448 /**
1449  * pmcraid_notify_aen - sends event msg to user space application
1450  * @pinstance: pointer to adapter instance structure
1451  * @type: HCAM type
1452  *
1453  * Return value:
1454  *      0 if success, error value in case of any failure.
1455  */
1456 static int pmcraid_notify_aen(
1457         struct pmcraid_instance *pinstance,
1458         struct pmcraid_aen_msg  *aen_msg,
1459         u32    data_size
1460 )
1461 {
1462         struct sk_buff *skb;
1463         void *msg_header;
1464         u32  total_size, nla_genl_hdr_total_size;
1465         int result;
1466
1467         aen_msg->hostno = (pinstance->host->unique_id << 16 |
1468                            MINOR(pinstance->cdev.dev));
1469         aen_msg->length = data_size;
1470
1471         data_size += sizeof(*aen_msg);
1472
1473         total_size = nla_total_size(data_size);
1474         /* Add GENL_HDR to total_size */
1475         nla_genl_hdr_total_size =
1476                 (total_size + (GENL_HDRLEN +
1477                 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1478                  + NLMSG_HDRLEN);
1479         skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1480
1481
1482         if (!skb) {
1483                 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1484                              total_size);
1485                 return -ENOMEM;
1486         }
1487
1488         /* add the genetlink message header */
1489         msg_header = genlmsg_put(skb, 0, 0,
1490                                  &pmcraid_event_family, 0,
1491                                  PMCRAID_AEN_CMD_EVENT);
1492         if (!msg_header) {
1493                 pmcraid_err("failed to copy command details\n");
1494                 nlmsg_free(skb);
1495                 return -ENOMEM;
1496         }
1497
1498         result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1499
1500         if (result) {
1501                 pmcraid_err("failed to copy AEN attribute data\n");
1502                 nlmsg_free(skb);
1503                 return -EINVAL;
1504         }
1505
1506         /* send genetlink multicast message to notify appplications */
1507         result = genlmsg_end(skb, msg_header);
1508
1509         if (result < 0) {
1510                 pmcraid_err("genlmsg_end failed\n");
1511                 nlmsg_free(skb);
1512                 return result;
1513         }
1514
1515         result =
1516                 genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC);
1517
1518         /* If there are no listeners, genlmsg_multicast may return non-zero
1519          * value.
1520          */
1521         if (result)
1522                 pmcraid_info("error (%x) sending aen event message\n", result);
1523         return result;
1524 }
1525
1526 /**
1527  * pmcraid_notify_ccn - notifies about CCN event msg to user space
1528  * @pinstance: pointer adapter instance structure
1529  *
1530  * Return value:
1531  *      0 if success, error value in case of any failure
1532  */
1533 static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1534 {
1535         return pmcraid_notify_aen(pinstance,
1536                                 pinstance->ccn.msg,
1537                                 pinstance->ccn.hcam->data_len +
1538                                 sizeof(struct pmcraid_hcam_hdr));
1539 }
1540
1541 /**
1542  * pmcraid_notify_ldn - notifies about CCN event msg to user space
1543  * @pinstance: pointer adapter instance structure
1544  *
1545  * Return value:
1546  *      0 if success, error value in case of any failure
1547  */
1548 static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1549 {
1550         return pmcraid_notify_aen(pinstance,
1551                                 pinstance->ldn.msg,
1552                                 pinstance->ldn.hcam->data_len +
1553                                 sizeof(struct pmcraid_hcam_hdr));
1554 }
1555
1556 /**
1557  * pmcraid_notify_ioastate - sends IOA state event msg to user space
1558  * @pinstance: pointer adapter instance structure
1559  * @evt: controller state event to be sent
1560  *
1561  * Return value:
1562  *      0 if success, error value in case of any failure
1563  */
1564 static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1565 {
1566         pinstance->scn.ioa_state = evt;
1567         pmcraid_notify_aen(pinstance,
1568                           &pinstance->scn.msg,
1569                           sizeof(u32));
1570 }
1571
1572 /**
1573  * pmcraid_handle_config_change - Handle a config change from the adapter
1574  * @pinstance: pointer to per adapter instance structure
1575  *
1576  * Return value:
1577  *  none
1578  */
1579
1580 static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1581 {
1582         struct pmcraid_config_table_entry *cfg_entry;
1583         struct pmcraid_hcam_ccn *ccn_hcam;
1584         struct pmcraid_cmd *cmd;
1585         struct pmcraid_cmd *cfgcmd;
1586         struct pmcraid_resource_entry *res = NULL;
1587         unsigned long lock_flags;
1588         unsigned long host_lock_flags;
1589         u32 new_entry = 1;
1590         u32 hidden_entry = 0;
1591         u16 fw_version;
1592         int rc;
1593
1594         ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1595         cfg_entry = &ccn_hcam->cfg_entry;
1596         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1597
1598         pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1599                  res: %x:%x:%x:%x\n",
1600                  pinstance->ccn.hcam->ilid,
1601                  pinstance->ccn.hcam->op_code,
1602                 ((pinstance->ccn.hcam->timestamp1) |
1603                 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1604                  pinstance->ccn.hcam->notification_type,
1605                  pinstance->ccn.hcam->notification_lost,
1606                  pinstance->ccn.hcam->flags,
1607                  pinstance->host->unique_id,
1608                  RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1609                  (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1610                         RES_BUS(cfg_entry->resource_address)),
1611                  RES_IS_VSET(*cfg_entry) ?
1612                         (fw_version <= PMCRAID_FW_VERSION_1 ?
1613                                 cfg_entry->unique_flags1 :
1614                                         cfg_entry->array_id & 0xFF) :
1615                         RES_TARGET(cfg_entry->resource_address),
1616                  RES_LUN(cfg_entry->resource_address));
1617
1618
1619         /* If this HCAM indicates a lost notification, read the config table */
1620         if (pinstance->ccn.hcam->notification_lost) {
1621                 cfgcmd = pmcraid_get_free_cmd(pinstance);
1622                 if (cfgcmd) {
1623                         pmcraid_info("lost CCN, reading config table\b");
1624                         pinstance->reinit_cfg_table = 1;
1625                         pmcraid_querycfg(cfgcmd);
1626                 } else {
1627                         pmcraid_err("lost CCN, no free cmd for querycfg\n");
1628                 }
1629                 goto out_notify_apps;
1630         }
1631
1632         /* If this resource is not going to be added to mid-layer, just notify
1633          * applications and return. If this notification is about hiding a VSET
1634          * resource, check if it was exposed already.
1635          */
1636         if (pinstance->ccn.hcam->notification_type ==
1637             NOTIFICATION_TYPE_ENTRY_CHANGED &&
1638             cfg_entry->resource_type == RES_TYPE_VSET) {
1639
1640                 if (fw_version <= PMCRAID_FW_VERSION_1)
1641                         hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1642                 else
1643                         hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1644
1645         } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1646                 goto out_notify_apps;
1647         }
1648
1649         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1650         list_for_each_entry(res, &pinstance->used_res_q, queue) {
1651                 rc = memcmp(&res->cfg_entry.resource_address,
1652                             &cfg_entry->resource_address,
1653                             sizeof(cfg_entry->resource_address));
1654                 if (!rc) {
1655                         new_entry = 0;
1656                         break;
1657                 }
1658         }
1659
1660         if (new_entry) {
1661
1662                 if (hidden_entry) {
1663                         spin_unlock_irqrestore(&pinstance->resource_lock,
1664                                                 lock_flags);
1665                         goto out_notify_apps;
1666                 }
1667
1668                 /* If there are more number of resources than what driver can
1669                  * manage, do not notify the applications about the CCN. Just
1670                  * ignore this notifications and re-register the same HCAM
1671                  */
1672                 if (list_empty(&pinstance->free_res_q)) {
1673                         spin_unlock_irqrestore(&pinstance->resource_lock,
1674                                                 lock_flags);
1675                         pmcraid_err("too many resources attached\n");
1676                         spin_lock_irqsave(pinstance->host->host_lock,
1677                                           host_lock_flags);
1678                         pmcraid_send_hcam(pinstance,
1679                                           PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1680                         spin_unlock_irqrestore(pinstance->host->host_lock,
1681                                                host_lock_flags);
1682                         return;
1683                 }
1684
1685                 res = list_entry(pinstance->free_res_q.next,
1686                                  struct pmcraid_resource_entry, queue);
1687
1688                 list_del(&res->queue);
1689                 res->scsi_dev = NULL;
1690                 res->reset_progress = 0;
1691                 list_add_tail(&res->queue, &pinstance->used_res_q);
1692         }
1693
1694         memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1695
1696         if (pinstance->ccn.hcam->notification_type ==
1697             NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1698                 if (res->scsi_dev) {
1699                         if (fw_version <= PMCRAID_FW_VERSION_1)
1700                                 res->cfg_entry.unique_flags1 &= 0x7F;
1701                         else
1702                                 res->cfg_entry.array_id &= 0xFF;
1703                         res->change_detected = RES_CHANGE_DEL;
1704                         res->cfg_entry.resource_handle =
1705                                 PMCRAID_INVALID_RES_HANDLE;
1706                         schedule_work(&pinstance->worker_q);
1707                 } else {
1708                         /* This may be one of the non-exposed resources */
1709                         list_move_tail(&res->queue, &pinstance->free_res_q);
1710                 }
1711         } else if (!res->scsi_dev) {
1712                 res->change_detected = RES_CHANGE_ADD;
1713                 schedule_work(&pinstance->worker_q);
1714         }
1715         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1716
1717 out_notify_apps:
1718
1719         /* Notify configuration changes to registered applications.*/
1720         if (!pmcraid_disable_aen)
1721                 pmcraid_notify_ccn(pinstance);
1722
1723         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1724         if (cmd)
1725                 pmcraid_send_hcam_cmd(cmd);
1726 }
1727
1728 /**
1729  * pmcraid_get_error_info - return error string for an ioasc
1730  * @ioasc: ioasc code
1731  * Return Value
1732  *       none
1733  */
1734 static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1735 {
1736         int i;
1737         for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1738                 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1739                         return &pmcraid_ioasc_error_table[i];
1740         }
1741         return NULL;
1742 }
1743
1744 /**
1745  * pmcraid_ioasc_logger - log IOASC information based user-settings
1746  * @ioasc: ioasc code
1747  * @cmd: pointer to command that resulted in 'ioasc'
1748  */
1749 void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1750 {
1751         struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1752
1753         if (error_info == NULL ||
1754                 cmd->drv_inst->current_log_level < error_info->log_level)
1755                 return;
1756
1757         /* log the error string */
1758         pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1759                 cmd->ioa_cb->ioarcb.cdb[0],
1760                 cmd->ioa_cb->ioarcb.resource_handle,
1761                 le32_to_cpu(ioasc), error_info->error_string);
1762 }
1763
1764 /**
1765  * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1766  *
1767  * @pinstance: pointer to per adapter instance structure
1768  *
1769  * Return value:
1770  *  none
1771  */
1772 static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1773 {
1774         struct pmcraid_hcam_ldn *hcam_ldn;
1775         u32 ioasc;
1776
1777         hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1778
1779         pmcraid_info
1780                 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1781                  pinstance->ldn.hcam->ilid,
1782                  pinstance->ldn.hcam->op_code,
1783                  pinstance->ldn.hcam->notification_type,
1784                  pinstance->ldn.hcam->notification_lost,
1785                  pinstance->ldn.hcam->flags,
1786                  pinstance->ldn.hcam->overlay_id);
1787
1788         /* log only the errors, no need to log informational log entries */
1789         if (pinstance->ldn.hcam->notification_type !=
1790             NOTIFICATION_TYPE_ERROR_LOG)
1791                 return;
1792
1793         if (pinstance->ldn.hcam->notification_lost ==
1794             HOSTRCB_NOTIFICATIONS_LOST)
1795                 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1796
1797         ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1798
1799         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1800                 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1801                 dev_info(&pinstance->pdev->dev,
1802                         "UnitAttention due to IOA Bus Reset\n");
1803                 scsi_report_bus_reset(
1804                         pinstance->host,
1805                         RES_BUS(hcam_ldn->error_log.fd_ra));
1806         }
1807
1808         return;
1809 }
1810
1811 /**
1812  * pmcraid_process_ccn - Op done function for a CCN.
1813  * @cmd: pointer to command struct
1814  *
1815  * This function is the op done function for a configuration
1816  * change notification
1817  *
1818  * Return value:
1819  * none
1820  */
1821 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1822 {
1823         struct pmcraid_instance *pinstance = cmd->drv_inst;
1824         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1825         unsigned long lock_flags;
1826
1827         pinstance->ccn.cmd = NULL;
1828         pmcraid_return_cmd(cmd);
1829
1830         /* If driver initiated IOA reset happened while this hcam was pending
1831          * with IOA, or IOA bringdown sequence is in progress, no need to
1832          * re-register the hcam
1833          */
1834         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1835             atomic_read(&pinstance->ccn.ignore) == 1) {
1836                 return;
1837         } else if (ioasc) {
1838                 dev_info(&pinstance->pdev->dev,
1839                         "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1840                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1841                 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1842                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1843         } else {
1844                 pmcraid_handle_config_change(pinstance);
1845         }
1846 }
1847
1848 /**
1849  * pmcraid_process_ldn - op done function for an LDN
1850  * @cmd: pointer to command block
1851  *
1852  * Return value
1853  *   none
1854  */
1855 static void pmcraid_initiate_reset(struct pmcraid_instance *);
1856 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1857
1858 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1859 {
1860         struct pmcraid_instance *pinstance = cmd->drv_inst;
1861         struct pmcraid_hcam_ldn *ldn_hcam =
1862                         (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1863         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1864         u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1865         unsigned long lock_flags;
1866
1867         /* return the command block back to freepool */
1868         pinstance->ldn.cmd = NULL;
1869         pmcraid_return_cmd(cmd);
1870
1871         /* If driver initiated IOA reset happened while this hcam was pending
1872          * with IOA, no need to re-register the hcam as reset engine will do it
1873          * once reset sequence is complete
1874          */
1875         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1876             atomic_read(&pinstance->ccn.ignore) == 1) {
1877                 return;
1878         } else if (!ioasc) {
1879                 pmcraid_handle_error_log(pinstance);
1880                 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1881                         spin_lock_irqsave(pinstance->host->host_lock,
1882                                           lock_flags);
1883                         pmcraid_initiate_reset(pinstance);
1884                         spin_unlock_irqrestore(pinstance->host->host_lock,
1885                                                lock_flags);
1886                         return;
1887                 }
1888                 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1889                         pinstance->timestamp_error = 1;
1890                         pmcraid_set_timestamp(cmd);
1891                 }
1892         } else {
1893                 dev_info(&pinstance->pdev->dev,
1894                         "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1895         }
1896         /* send netlink message for HCAM notification if enabled */
1897         if (!pmcraid_disable_aen)
1898                 pmcraid_notify_ldn(pinstance);
1899
1900         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1901         if (cmd)
1902                 pmcraid_send_hcam_cmd(cmd);
1903 }
1904
1905 /**
1906  * pmcraid_register_hcams - register HCAMs for CCN and LDN
1907  *
1908  * @pinstance: pointer per adapter instance structure
1909  *
1910  * Return Value
1911  *   none
1912  */
1913 static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1914 {
1915         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1916         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1917 }
1918
1919 /**
1920  * pmcraid_unregister_hcams - cancel HCAMs registered already
1921  * @cmd: pointer to command used as part of reset sequence
1922  */
1923 static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1924 {
1925         struct pmcraid_instance *pinstance = cmd->drv_inst;
1926
1927         /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1928          * handling hcam response though it is not necessary. In order to
1929          * prevent this, set 'ignore', so that bring-down sequence doesn't
1930          * re-send any more hcams
1931          */
1932         atomic_set(&pinstance->ccn.ignore, 1);
1933         atomic_set(&pinstance->ldn.ignore, 1);
1934
1935         /* If adapter reset was forced as part of runtime reset sequence,
1936          * start the reset sequence. Reset will be triggered even in case
1937          * IOA unit_check.
1938          */
1939         if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1940              pinstance->ioa_unit_check) {
1941                 pinstance->force_ioa_reset = 0;
1942                 pinstance->ioa_unit_check = 0;
1943                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1944                 pmcraid_reset_alert(cmd);
1945                 return;
1946         }
1947
1948         /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1949          * one after the other. So CCN cancellation will be triggered by
1950          * pmcraid_cancel_ldn itself.
1951          */
1952         pmcraid_cancel_ldn(cmd);
1953 }
1954
1955 /**
1956  * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1957  * @pinstance: pointer to adapter instance structure
1958  * Return Value
1959  *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1960  */
1961 static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1962
1963 static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1964 {
1965         u32 intrs;
1966
1967         pmcraid_reinit_buffers(pinstance);
1968         intrs = pmcraid_read_interrupts(pinstance);
1969
1970         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1971
1972         if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1973                 if (!pinstance->interrupt_mode) {
1974                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1975                                 pinstance->int_regs.
1976                                 ioa_host_interrupt_mask_reg);
1977                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1978                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1979                 }
1980                 return 1;
1981         } else {
1982                 return 0;
1983         }
1984 }
1985
1986 /**
1987  * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1988  * @cmd : pointer to reset command block
1989  *
1990  * Return Value
1991  *      none
1992  */
1993 static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1994 {
1995         struct pmcraid_instance *pinstance = cmd->drv_inst;
1996         u32 int_reg;
1997         u32 doorbell;
1998
1999         /* There will be an interrupt when Transition to Operational bit is
2000          * set so tasklet would execute next reset task. The timeout handler
2001          * would re-initiate a reset
2002          */
2003         cmd->cmd_done = pmcraid_ioa_reset;
2004         cmd->timer.data = (unsigned long)cmd;
2005         cmd->timer.expires = jiffies +
2006                              msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
2007         cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
2008
2009         if (!timer_pending(&cmd->timer))
2010                 add_timer(&cmd->timer);
2011
2012         /* Enable destructive diagnostics on IOA if it is not yet in
2013          * operational state
2014          */
2015         doorbell = DOORBELL_RUNTIME_RESET |
2016                    DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
2017
2018         /* Since we do RESET_ALERT and Start BIST we have to again write
2019          * MSIX Doorbell to indicate the interrupt mode
2020          */
2021         if (pinstance->interrupt_mode) {
2022                 iowrite32(DOORBELL_INTR_MODE_MSIX,
2023                           pinstance->int_regs.host_ioa_interrupt_reg);
2024                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
2025         }
2026
2027         iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
2028         ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2029         int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
2030
2031         pmcraid_info("Waiting for IOA to become operational %x:%x\n",
2032                      ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2033                      int_reg);
2034 }
2035
2036 /**
2037  * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2038  *
2039  * @pinstance: pointer to adapter instance structure
2040  *
2041  * Return Value
2042  *      none
2043  */
2044 static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2045 {
2046         pmcraid_info("%s is not yet implemented\n", __func__);
2047 }
2048
2049 /**
2050  * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2051  * @pinstance: pointer to adapter instance structure
2052  *
2053  * This function fails all outstanding ops. If they are submitted to IOA
2054  * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2055  * otherwise just completes the commands and returns the cmd blocks to free
2056  * pool.
2057  *
2058  * Return value:
2059  *       none
2060  */
2061 static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2062 {
2063         struct pmcraid_cmd *cmd, *temp;
2064         unsigned long lock_flags;
2065
2066         /* pending command list is protected by pending_pool_lock. Its
2067          * traversal must be done as within this lock
2068          */
2069         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2070         list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2071                                  free_list) {
2072                 list_del(&cmd->free_list);
2073                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2074                                         lock_flags);
2075                 cmd->ioa_cb->ioasa.ioasc =
2076                         cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2077                 cmd->ioa_cb->ioasa.ilid =
2078                         cpu_to_be32(PMCRAID_DRIVER_ILID);
2079
2080                 /* In case the command timer is still running */
2081                 del_timer(&cmd->timer);
2082
2083                 /* If this is an IO command, complete it by invoking scsi_done
2084                  * function. If this is one of the internal commands other
2085                  * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2086                  * complete it
2087                  */
2088                 if (cmd->scsi_cmd) {
2089
2090                         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2091                         __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2092
2093                         scsi_cmd->result |= DID_ERROR << 16;
2094
2095                         scsi_dma_unmap(scsi_cmd);
2096                         pmcraid_return_cmd(cmd);
2097
2098                         pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2099                                      le32_to_cpu(resp) >> 2,
2100                                      cmd->ioa_cb->ioarcb.cdb[0],
2101                                      scsi_cmd->result);
2102                         scsi_cmd->scsi_done(scsi_cmd);
2103                 } else if (cmd->cmd_done == pmcraid_internal_done ||
2104                            cmd->cmd_done == pmcraid_erp_done) {
2105                         cmd->cmd_done(cmd);
2106                 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2107                            cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2108                         pmcraid_return_cmd(cmd);
2109                 }
2110
2111                 atomic_dec(&pinstance->outstanding_cmds);
2112                 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2113         }
2114
2115         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2116 }
2117
2118 /**
2119  * pmcraid_ioa_reset - Implementation of IOA reset logic
2120  *
2121  * @cmd: pointer to the cmd block to be used for entire reset process
2122  *
2123  * This function executes most of the steps required for IOA reset. This gets
2124  * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2125  * 'eh_' thread. Access to variables used for controling the reset sequence is
2126  * synchronized using host lock. Various functions called during reset process
2127  * would make use of a single command block, pointer to which is also stored in
2128  * adapter instance structure.
2129  *
2130  * Return Value
2131  *       None
2132  */
2133 static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2134 {
2135         struct pmcraid_instance *pinstance = cmd->drv_inst;
2136         u8 reset_complete = 0;
2137
2138         pinstance->ioa_reset_in_progress = 1;
2139
2140         if (pinstance->reset_cmd != cmd) {
2141                 pmcraid_err("reset is called with different command block\n");
2142                 pinstance->reset_cmd = cmd;
2143         }
2144
2145         pmcraid_info("reset_engine: state = %d, command = %p\n",
2146                       pinstance->ioa_state, cmd);
2147
2148         switch (pinstance->ioa_state) {
2149
2150         case IOA_STATE_DEAD:
2151                 /* If IOA is offline, whatever may be the reset reason, just
2152                  * return. callers might be waiting on the reset wait_q, wake
2153                  * up them
2154                  */
2155                 pmcraid_err("IOA is offline no reset is possible\n");
2156                 reset_complete = 1;
2157                 break;
2158
2159         case IOA_STATE_IN_BRINGDOWN:
2160                 /* we enter here, once ioa shutdown command is processed by IOA
2161                  * Alert IOA for a possible reset. If reset alert fails, IOA
2162                  * goes through hard-reset
2163                  */
2164                 pmcraid_disable_interrupts(pinstance, ~0);
2165                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2166                 pmcraid_reset_alert(cmd);
2167                 break;
2168
2169         case IOA_STATE_UNKNOWN:
2170                 /* We may be called during probe or resume. Some pre-processing
2171                  * is required for prior to reset
2172                  */
2173                 scsi_block_requests(pinstance->host);
2174
2175                 /* If asked to reset while IOA was processing responses or
2176                  * there are any error responses then IOA may require
2177                  * hard-reset.
2178                  */
2179                 if (pinstance->ioa_hard_reset == 0) {
2180                         if (ioread32(pinstance->ioa_status) &
2181                             INTRS_TRANSITION_TO_OPERATIONAL) {
2182                                 pmcraid_info("sticky bit set, bring-up\n");
2183                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2184                                 pmcraid_reinit_cmdblk(cmd);
2185                                 pmcraid_identify_hrrq(cmd);
2186                         } else {
2187                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2188                                 pmcraid_soft_reset(cmd);
2189                         }
2190                 } else {
2191                         /* Alert IOA of a possible reset and wait for critical
2192                          * operation in progress bit to reset
2193                          */
2194                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2195                         pmcraid_reset_alert(cmd);
2196                 }
2197                 break;
2198
2199         case IOA_STATE_IN_RESET_ALERT:
2200                 /* If critical operation in progress bit is reset or wait gets
2201                  * timed out, reset proceeds with starting BIST on the IOA.
2202                  * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2203                  * they are 3 or more, reset engine marks IOA dead and returns
2204                  */
2205                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2206                 pmcraid_start_bist(cmd);
2207                 break;
2208
2209         case IOA_STATE_IN_HARD_RESET:
2210                 pinstance->ioa_reset_attempts++;
2211
2212                 /* retry reset if we haven't reached maximum allowed limit */
2213                 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2214                         pinstance->ioa_reset_attempts = 0;
2215                         pmcraid_err("IOA didn't respond marking it as dead\n");
2216                         pinstance->ioa_state = IOA_STATE_DEAD;
2217
2218                         if (pinstance->ioa_bringdown)
2219                                 pmcraid_notify_ioastate(pinstance,
2220                                         PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2221                         else
2222                                 pmcraid_notify_ioastate(pinstance,
2223                                                 PMC_DEVICE_EVENT_RESET_FAILED);
2224                         reset_complete = 1;
2225                         break;
2226                 }
2227
2228                 /* Once either bist or pci reset is done, restore PCI config
2229                  * space. If this fails, proceed with hard reset again
2230                  */
2231                 pci_restore_state(pinstance->pdev);
2232
2233                 /* fail all pending commands */
2234                 pmcraid_fail_outstanding_cmds(pinstance);
2235
2236                 /* check if unit check is active, if so extract dump */
2237                 if (pinstance->ioa_unit_check) {
2238                         pmcraid_info("unit check is active\n");
2239                         pinstance->ioa_unit_check = 0;
2240                         pmcraid_get_dump(pinstance);
2241                         pinstance->ioa_reset_attempts--;
2242                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2243                         pmcraid_reset_alert(cmd);
2244                         break;
2245                 }
2246
2247                 /* if the reset reason is to bring-down the ioa, we might be
2248                  * done with the reset restore pci_config_space and complete
2249                  * the reset
2250                  */
2251                 if (pinstance->ioa_bringdown) {
2252                         pmcraid_info("bringing down the adapter\n");
2253                         pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2254                         pinstance->ioa_bringdown = 0;
2255                         pinstance->ioa_state = IOA_STATE_UNKNOWN;
2256                         pmcraid_notify_ioastate(pinstance,
2257                                         PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2258                         reset_complete = 1;
2259                 } else {
2260                         /* bring-up IOA, so proceed with soft reset
2261                          * Reinitialize hrrq_buffers and their indices also
2262                          * enable interrupts after a pci_restore_state
2263                          */
2264                         if (pmcraid_reset_enable_ioa(pinstance)) {
2265                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2266                                 pmcraid_info("bringing up the adapter\n");
2267                                 pmcraid_reinit_cmdblk(cmd);
2268                                 pmcraid_identify_hrrq(cmd);
2269                         } else {
2270                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2271                                 pmcraid_soft_reset(cmd);
2272                         }
2273                 }
2274                 break;
2275
2276         case IOA_STATE_IN_SOFT_RESET:
2277                 /* TRANSITION TO OPERATIONAL is on so start initialization
2278                  * sequence
2279                  */
2280                 pmcraid_info("In softreset proceeding with bring-up\n");
2281                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2282
2283                 /* Initialization commands start with HRRQ identification. From
2284                  * now on tasklet completes most of the commands as IOA is up
2285                  * and intrs are enabled
2286                  */
2287                 pmcraid_identify_hrrq(cmd);
2288                 break;
2289
2290         case IOA_STATE_IN_BRINGUP:
2291                 /* we are done with bringing up of IOA, change the ioa_state to
2292                  * operational and wake up any waiters
2293                  */
2294                 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2295                 reset_complete = 1;
2296                 break;
2297
2298         case IOA_STATE_OPERATIONAL:
2299         default:
2300                 /* When IOA is operational and a reset is requested, check for
2301                  * the reset reason. If reset is to bring down IOA, unregister
2302                  * HCAMs and initiate shutdown; if adapter reset is forced then
2303                  * restart reset sequence again
2304                  */
2305                 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2306                     pinstance->force_ioa_reset == 0) {
2307                         pmcraid_notify_ioastate(pinstance,
2308                                                 PMC_DEVICE_EVENT_RESET_SUCCESS);
2309                         reset_complete = 1;
2310                 } else {
2311                         if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2312                                 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2313                         pmcraid_reinit_cmdblk(cmd);
2314                         pmcraid_unregister_hcams(cmd);
2315                 }
2316                 break;
2317         }
2318
2319         /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2320          * OPERATIONAL. Reset all control variables used during reset, wake up
2321          * any waiting threads and let the SCSI mid-layer send commands. Note
2322          * that host_lock must be held before invoking scsi_report_bus_reset.
2323          */
2324         if (reset_complete) {
2325                 pinstance->ioa_reset_in_progress = 0;
2326                 pinstance->ioa_reset_attempts = 0;
2327                 pinstance->reset_cmd = NULL;
2328                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2329                 pinstance->ioa_bringdown = 0;
2330                 pmcraid_return_cmd(cmd);
2331
2332                 /* If target state is to bring up the adapter, proceed with
2333                  * hcam registration and resource exposure to mid-layer.
2334                  */
2335                 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2336                         pmcraid_register_hcams(pinstance);
2337
2338                 wake_up_all(&pinstance->reset_wait_q);
2339         }
2340
2341         return;
2342 }
2343
2344 /**
2345  * pmcraid_initiate_reset - initiates reset sequence. This is called from
2346  * ISR/tasklet during error interrupts including IOA unit check. If reset
2347  * is already in progress, it just returns, otherwise initiates IOA reset
2348  * to bring IOA up to operational state.
2349  *
2350  * @pinstance: pointer to adapter instance structure
2351  *
2352  * Return value
2353  *       none
2354  */
2355 static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2356 {
2357         struct pmcraid_cmd *cmd;
2358
2359         /* If the reset is already in progress, just return, otherwise start
2360          * reset sequence and return
2361          */
2362         if (!pinstance->ioa_reset_in_progress) {
2363                 scsi_block_requests(pinstance->host);
2364                 cmd = pmcraid_get_free_cmd(pinstance);
2365
2366                 if (cmd == NULL) {
2367                         pmcraid_err("no cmnd blocks for initiate_reset\n");
2368                         return;
2369                 }
2370
2371                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2372                 pinstance->reset_cmd = cmd;
2373                 pinstance->force_ioa_reset = 1;
2374                 pmcraid_notify_ioastate(pinstance,
2375                                         PMC_DEVICE_EVENT_RESET_START);
2376                 pmcraid_ioa_reset(cmd);
2377         }
2378 }
2379
2380 /**
2381  * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2382  *                        or bringdown IOA
2383  * @pinstance: pointer adapter instance structure
2384  * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2385  * @target_state: expected target state after reset
2386  *
2387  * Note: This command initiates reset and waits for its completion. Hence this
2388  * should not be called from isr/timer/tasklet functions (timeout handlers,
2389  * error response handlers and interrupt handlers).
2390  *
2391  * Return Value
2392  *       1 in case ioa_state is not target_state, 0 otherwise.
2393  */
2394 static int pmcraid_reset_reload(
2395         struct pmcraid_instance *pinstance,
2396         u8 shutdown_type,
2397         u8 target_state
2398 )
2399 {
2400         struct pmcraid_cmd *reset_cmd = NULL;
2401         unsigned long lock_flags;
2402         int reset = 1;
2403
2404         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2405
2406         if (pinstance->ioa_reset_in_progress) {
2407                 pmcraid_info("reset_reload: reset is already in progress\n");
2408
2409                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2410
2411                 wait_event(pinstance->reset_wait_q,
2412                            !pinstance->ioa_reset_in_progress);
2413
2414                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2415
2416                 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2417                         spin_unlock_irqrestore(pinstance->host->host_lock,
2418                                                lock_flags);
2419                         pmcraid_info("reset_reload: IOA is dead\n");
2420                         return reset;
2421                 } else if (pinstance->ioa_state == target_state) {
2422                         reset = 0;
2423                 }
2424         }
2425
2426         if (reset) {
2427                 pmcraid_info("reset_reload: proceeding with reset\n");
2428                 scsi_block_requests(pinstance->host);
2429                 reset_cmd = pmcraid_get_free_cmd(pinstance);
2430
2431                 if (reset_cmd == NULL) {
2432                         pmcraid_err("no free cmnd for reset_reload\n");
2433                         spin_unlock_irqrestore(pinstance->host->host_lock,
2434                                                lock_flags);
2435                         return reset;
2436                 }
2437
2438                 if (shutdown_type == SHUTDOWN_NORMAL)
2439                         pinstance->ioa_bringdown = 1;
2440
2441                 pinstance->ioa_shutdown_type = shutdown_type;
2442                 pinstance->reset_cmd = reset_cmd;
2443                 pinstance->force_ioa_reset = reset;
2444                 pmcraid_info("reset_reload: initiating reset\n");
2445                 pmcraid_ioa_reset(reset_cmd);
2446                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2447                 pmcraid_info("reset_reload: waiting for reset to complete\n");
2448                 wait_event(pinstance->reset_wait_q,
2449                            !pinstance->ioa_reset_in_progress);
2450
2451                 pmcraid_info("reset_reload: reset is complete !!\n");
2452                 scsi_unblock_requests(pinstance->host);
2453                 if (pinstance->ioa_state == target_state)
2454                         reset = 0;
2455         }
2456
2457         return reset;
2458 }
2459
2460 /**
2461  * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2462  *
2463  * @pinstance: pointer to adapter instance structure
2464  *
2465  * Return Value
2466  *       whatever is returned from pmcraid_reset_reload
2467  */
2468 static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2469 {
2470         return pmcraid_reset_reload(pinstance,
2471                                     SHUTDOWN_NORMAL,
2472                                     IOA_STATE_UNKNOWN);
2473 }
2474
2475 /**
2476  * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2477  *
2478  * @pinstance: pointer to adapter instance structure
2479  *
2480  * Return Value
2481  *       whatever is returned from pmcraid_reset_reload
2482  */
2483 static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2484 {
2485         pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2486
2487         return pmcraid_reset_reload(pinstance,
2488                                     SHUTDOWN_NONE,
2489                                     IOA_STATE_OPERATIONAL);
2490 }
2491
2492 /**
2493  * pmcraid_request_sense - Send request sense to a device
2494  * @cmd: pmcraid command struct
2495  *
2496  * This function sends a request sense to a device as a result of a check
2497  * condition. This method re-uses the same command block that failed earlier.
2498  */
2499 static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2500 {
2501         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2502         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2503
2504         /* allocate DMAable memory for sense buffers */
2505         cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2506                                                  SCSI_SENSE_BUFFERSIZE,
2507                                                  &cmd->sense_buffer_dma);
2508
2509         if (cmd->sense_buffer == NULL) {
2510                 pmcraid_err
2511                         ("couldn't allocate sense buffer for request sense\n");
2512                 pmcraid_erp_done(cmd);
2513                 return;
2514         }
2515
2516         /* re-use the command block */
2517         memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2518         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2519         ioarcb->request_flags0 = (SYNC_COMPLETE |
2520                                   NO_LINK_DESCS |
2521                                   INHIBIT_UL_CHECK);
2522         ioarcb->request_type = REQ_TYPE_SCSI;
2523         ioarcb->cdb[0] = REQUEST_SENSE;
2524         ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2525
2526         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2527                                         offsetof(struct pmcraid_ioarcb,
2528                                                 add_data.u.ioadl[0]));
2529         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2530
2531         ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2532
2533         ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2534         ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2535         ioadl->flags = IOADL_FLAGS_LAST_DESC;
2536
2537         /* request sense might be called as part of error response processing
2538          * which runs in tasklets context. It is possible that mid-layer might
2539          * schedule queuecommand during this time, hence, writting to IOARRIN
2540          * must be protect by host_lock
2541          */
2542         pmcraid_send_cmd(cmd, pmcraid_erp_done,
2543                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2544                          pmcraid_timeout_handler);
2545 }
2546
2547 /**
2548  * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2549  * @cmd: command that failed
2550  * @sense: true if request_sense is required after cancel all
2551  *
2552  * This function sends a cancel all to a device to clear the queue.
2553  */
2554 static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2555 {
2556         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2557         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2558         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2559         void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2560                                                         : pmcraid_request_sense;
2561
2562         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2563         ioarcb->request_flags0 = SYNC_OVERRIDE;
2564         ioarcb->request_type = REQ_TYPE_IOACMD;
2565         ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2566
2567         if (RES_IS_GSCSI(res->cfg_entry))
2568                 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2569
2570         ioarcb->ioadl_bus_addr = 0;
2571         ioarcb->ioadl_length = 0;
2572         ioarcb->data_transfer_length = 0;
2573         ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2574
2575         /* writing to IOARRIN must be protected by host_lock, as mid-layer
2576          * schedule queuecommand while we are doing this
2577          */
2578         pmcraid_send_cmd(cmd, cmd_done,
2579                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2580                          pmcraid_timeout_handler);
2581 }
2582
2583 /**
2584  * pmcraid_frame_auto_sense: frame fixed format sense information
2585  *
2586  * @cmd: pointer to failing command block
2587  *
2588  * Return value
2589  *  none
2590  */
2591 static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2592 {
2593         u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2594         struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2595         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2596         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2597         u32 failing_lba = 0;
2598
2599         memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2600         cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2601
2602         if (RES_IS_VSET(res->cfg_entry) &&
2603             ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2604             ioasa->u.vset.failing_lba_hi != 0) {
2605
2606                 sense_buf[0] = 0x72;
2607                 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2608                 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2609                 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2610
2611                 sense_buf[7] = 12;
2612                 sense_buf[8] = 0;
2613                 sense_buf[9] = 0x0A;
2614                 sense_buf[10] = 0x80;
2615
2616                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2617
2618                 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2619                 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2620                 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2621                 sense_buf[15] = failing_lba & 0x000000ff;
2622
2623                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2624
2625                 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2626                 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2627                 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2628                 sense_buf[19] = failing_lba & 0x000000ff;
2629         } else {
2630                 sense_buf[0] = 0x70;
2631                 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2632                 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2633                 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2634
2635                 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2636                         if (RES_IS_VSET(res->cfg_entry))
2637                                 failing_lba =
2638                                         le32_to_cpu(ioasa->u.
2639                                                  vset.failing_lba_lo);
2640                         sense_buf[0] |= 0x80;
2641                         sense_buf[3] = (failing_lba >> 24) & 0xff;
2642                         sense_buf[4] = (failing_lba >> 16) & 0xff;
2643                         sense_buf[5] = (failing_lba >> 8) & 0xff;
2644                         sense_buf[6] = failing_lba & 0xff;
2645                 }
2646
2647                 sense_buf[7] = 6; /* additional length */
2648         }
2649 }
2650
2651 /**
2652  * pmcraid_error_handler - Error response handlers for a SCSI op
2653  * @cmd: pointer to pmcraid_cmd that has failed
2654  *
2655  * This function determines whether or not to initiate ERP on the affected
2656  * device. This is called from a tasklet, which doesn't hold any locks.
2657  *
2658  * Return value:
2659  *       0 it caller can complete the request, otherwise 1 where in error
2660  *       handler itself completes the request and returns the command block
2661  *       back to free-pool
2662  */
2663 static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2664 {
2665         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2666         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2667         struct pmcraid_instance *pinstance = cmd->drv_inst;
2668         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2669         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2670         u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2671         u32 sense_copied = 0;
2672
2673         if (!res) {
2674                 pmcraid_info("resource pointer is NULL\n");
2675                 return 0;
2676         }
2677
2678         /* If this was a SCSI read/write command keep count of errors */
2679         if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2680                 atomic_inc(&res->read_failures);
2681         else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2682                 atomic_inc(&res->write_failures);
2683
2684         if (!RES_IS_GSCSI(res->cfg_entry) &&
2685                 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2686                 pmcraid_frame_auto_sense(cmd);
2687         }
2688
2689         /* Log IOASC/IOASA information based on user settings */
2690         pmcraid_ioasc_logger(ioasc, cmd);
2691
2692         switch (masked_ioasc) {
2693
2694         case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2695                 scsi_cmd->result |= (DID_ABORT << 16);
2696                 break;
2697
2698         case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2699         case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2700                 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2701                 break;
2702
2703         case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2704                 res->sync_reqd = 1;
2705                 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2706                 break;
2707
2708         case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2709                 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2710                 break;
2711
2712         case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2713         case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2714                 if (!res->reset_progress)
2715                         scsi_report_bus_reset(pinstance->host,
2716                                               scsi_cmd->device->channel);
2717                 scsi_cmd->result |= (DID_ERROR << 16);
2718                 break;
2719
2720         case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2721                 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2722                 res->sync_reqd = 1;
2723
2724                 /* if check_condition is not active return with error otherwise
2725                  * get/frame the sense buffer
2726                  */
2727                 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2728                     SAM_STAT_CHECK_CONDITION &&
2729                     PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2730                         return 0;
2731
2732                 /* If we have auto sense data as part of IOASA pass it to
2733                  * mid-layer
2734                  */
2735                 if (ioasa->auto_sense_length != 0) {
2736                         short sense_len = ioasa->auto_sense_length;
2737                         int data_size = min_t(u16, le16_to_cpu(sense_len),
2738                                               SCSI_SENSE_BUFFERSIZE);
2739
2740                         memcpy(scsi_cmd->sense_buffer,
2741                                ioasa->sense_data,
2742                                data_size);
2743                         sense_copied = 1;
2744                 }
2745
2746                 if (RES_IS_GSCSI(res->cfg_entry))
2747                         pmcraid_cancel_all(cmd, sense_copied);
2748                 else if (sense_copied)
2749                         pmcraid_erp_done(cmd);
2750                 else
2751                         pmcraid_request_sense(cmd);
2752
2753                 return 1;
2754
2755         case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2756                 break;
2757
2758         default:
2759                 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2760                         scsi_cmd->result |= (DID_ERROR << 16);
2761                 break;
2762         }
2763         return 0;
2764 }
2765
2766 /**
2767  * pmcraid_reset_device - device reset handler functions
2768  *
2769  * @scsi_cmd: scsi command struct
2770  * @modifier: reset modifier indicating the reset sequence to be performed
2771  *
2772  * This function issues a device reset to the affected device.
2773  * A LUN reset will be sent to the device first. If that does
2774  * not work, a target reset will be sent.
2775  *
2776  * Return value:
2777  *      SUCCESS / FAILED
2778  */
2779 static int pmcraid_reset_device(
2780         struct scsi_cmnd *scsi_cmd,
2781         unsigned long timeout,
2782         u8 modifier
2783 )
2784 {
2785         struct pmcraid_cmd *cmd;
2786         struct pmcraid_instance *pinstance;
2787         struct pmcraid_resource_entry *res;
2788         struct pmcraid_ioarcb *ioarcb;
2789         unsigned long lock_flags;
2790         u32 ioasc;
2791
2792         pinstance =
2793                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2794         res = scsi_cmd->device->hostdata;
2795
2796         if (!res) {
2797                 sdev_printk(KERN_ERR, scsi_cmd->device,
2798                             "reset_device: NULL resource pointer\n");
2799                 return FAILED;
2800         }
2801
2802         /* If adapter is currently going through reset/reload, return failed.
2803          * This will force the mid-layer to call _eh_bus/host reset, which
2804          * will then go to sleep and wait for the reset to complete
2805          */
2806         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2807         if (pinstance->ioa_reset_in_progress ||
2808             pinstance->ioa_state == IOA_STATE_DEAD) {
2809                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2810                 return FAILED;
2811         }
2812
2813         res->reset_progress = 1;
2814         pmcraid_info("Resetting %s resource with addr %x\n",
2815                      ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2816                      ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2817                      le32_to_cpu(res->cfg_entry.resource_address));
2818
2819         /* get a free cmd block */
2820         cmd = pmcraid_get_free_cmd(pinstance);
2821
2822         if (cmd == NULL) {
2823                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2824                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2825                 return FAILED;
2826         }
2827
2828         ioarcb = &cmd->ioa_cb->ioarcb;
2829         ioarcb->resource_handle = res->cfg_entry.resource_handle;
2830         ioarcb->request_type = REQ_TYPE_IOACMD;
2831         ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2832
2833         /* Initialize reset modifier bits */
2834         if (modifier)
2835                 modifier = ENABLE_RESET_MODIFIER | modifier;
2836
2837         ioarcb->cdb[1] = modifier;
2838
2839         init_completion(&cmd->wait_for_completion);
2840         cmd->completion_req = 1;
2841
2842         pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2843                      cmd->ioa_cb->ioarcb.cdb[0],
2844                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2845                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2846
2847         pmcraid_send_cmd(cmd,
2848                          pmcraid_internal_done,
2849                          timeout,
2850                          pmcraid_timeout_handler);
2851
2852         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2853
2854         /* RESET_DEVICE command completes after all pending IOARCBs are
2855          * completed. Once this command is completed, pmcraind_internal_done
2856          * will wake up the 'completion' queue.
2857          */
2858         wait_for_completion(&cmd->wait_for_completion);
2859
2860         /* complete the command here itself and return the command block
2861          * to free list
2862          */
2863         pmcraid_return_cmd(cmd);
2864         res->reset_progress = 0;
2865         ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2866
2867         /* set the return value based on the returned ioasc */
2868         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2869 }
2870
2871 /**
2872  * _pmcraid_io_done - helper for pmcraid_io_done function
2873  *
2874  * @cmd: pointer to pmcraid command struct
2875  * @reslen: residual data length to be set in the ioasa
2876  * @ioasc: ioasc either returned by IOA or set by driver itself.
2877  *
2878  * This function is invoked by pmcraid_io_done to complete mid-layer
2879  * scsi ops.
2880  *
2881  * Return value:
2882  *        0 if caller is required to return it to free_pool. Returns 1 if
2883  *        caller need not worry about freeing command block as error handler
2884  *        will take care of that.
2885  */
2886
2887 static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2888 {
2889         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2890         int rc = 0;
2891
2892         scsi_set_resid(scsi_cmd, reslen);
2893
2894         pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2895                 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2896                 cmd->ioa_cb->ioarcb.cdb[0],
2897                 ioasc, scsi_cmd->result);
2898
2899         if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2900                 rc = pmcraid_error_handler(cmd);
2901
2902         if (rc == 0) {
2903                 scsi_dma_unmap(scsi_cmd);
2904                 scsi_cmd->scsi_done(scsi_cmd);
2905         }
2906
2907         return rc;
2908 }
2909
2910 /**
2911  * pmcraid_io_done - SCSI completion function
2912  *
2913  * @cmd: pointer to pmcraid command struct
2914  *
2915  * This function is invoked by tasklet/mid-layer error handler to completing
2916  * the SCSI ops sent from mid-layer.
2917  *
2918  * Return value
2919  *        none
2920  */
2921
2922 static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2923 {
2924         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2925         u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2926
2927         if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2928                 pmcraid_return_cmd(cmd);
2929 }
2930
2931 /**
2932  * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2933  *
2934  * @cmd: command block of the command to be aborted
2935  *
2936  * Return Value:
2937  *       returns pointer to command structure used as cancelling cmd
2938  */
2939 static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2940 {
2941         struct pmcraid_cmd *cancel_cmd;
2942         struct pmcraid_instance *pinstance;
2943         struct pmcraid_resource_entry *res;
2944
2945         pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2946         res = cmd->scsi_cmd->device->hostdata;
2947
2948         cancel_cmd = pmcraid_get_free_cmd(pinstance);
2949
2950         if (cancel_cmd == NULL) {
2951                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2952                 return NULL;
2953         }
2954
2955         pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2956
2957         pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2958                 cmd->ioa_cb->ioarcb.cdb[0],
2959                 cmd->ioa_cb->ioarcb.response_handle >> 2);
2960
2961         init_completion(&cancel_cmd->wait_for_completion);
2962         cancel_cmd->completion_req = 1;
2963
2964         pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2965                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2966                 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2967                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2968
2969         pmcraid_send_cmd(cancel_cmd,
2970                          pmcraid_internal_done,
2971                          PMCRAID_INTERNAL_TIMEOUT,
2972                          pmcraid_timeout_handler);
2973         return cancel_cmd;
2974 }
2975
2976 /**
2977  * pmcraid_abort_complete - Waits for ABORT TASK completion
2978  *
2979  * @cancel_cmd: command block use as cancelling command
2980  *
2981  * Return Value:
2982  *       returns SUCCESS if ABORT TASK has good completion
2983  *       otherwise FAILED
2984  */
2985 static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2986 {
2987         struct pmcraid_resource_entry *res;
2988         u32 ioasc;
2989
2990         wait_for_completion(&cancel_cmd->wait_for_completion);
2991         res = cancel_cmd->res;
2992         cancel_cmd->res = NULL;
2993         ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2994
2995         /* If the abort task is not timed out we will get a Good completion
2996          * as sense_key, otherwise we may get one the following responses
2997          * due to subsquent bus reset or device reset. In case IOASC is
2998          * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2999          */
3000         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
3001             ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
3002                 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
3003                         res->sync_reqd = 1;
3004                 ioasc = 0;
3005         }
3006
3007         /* complete the command here itself */
3008         pmcraid_return_cmd(cancel_cmd);
3009         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
3010 }
3011
3012 /**
3013  * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
3014  *
3015  * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
3016  *              mid-layer ensures that no other commands are queued. This
3017  *              never gets called under interrupt, but a separate eh thread.
3018  *
3019  * Return value:
3020  *       SUCCESS / FAILED
3021  */
3022 static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
3023 {
3024         struct pmcraid_instance *pinstance;
3025         struct pmcraid_cmd *cmd;
3026         struct pmcraid_resource_entry *res;
3027         unsigned long host_lock_flags;
3028         unsigned long pending_lock_flags;
3029         struct pmcraid_cmd *cancel_cmd = NULL;
3030         int cmd_found = 0;
3031         int rc = FAILED;
3032
3033         pinstance =
3034                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3035
3036         scmd_printk(KERN_INFO, scsi_cmd,
3037                     "I/O command timed out, aborting it.\n");
3038
3039         res = scsi_cmd->device->hostdata;
3040
3041         if (res == NULL)
3042                 return rc;
3043
3044         /* If we are currently going through reset/reload, return failed.
3045          * This will force the mid-layer to eventually call
3046          * pmcraid_eh_host_reset which will then go to sleep and wait for the
3047          * reset to complete
3048          */
3049         spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3050
3051         if (pinstance->ioa_reset_in_progress ||
3052             pinstance->ioa_state == IOA_STATE_DEAD) {
3053                 spin_unlock_irqrestore(pinstance->host->host_lock,
3054                                        host_lock_flags);
3055                 return rc;
3056         }
3057
3058         /* loop over pending cmd list to find cmd corresponding to this
3059          * scsi_cmd. Note that this command might not have been completed
3060          * already. locking: all pending commands are protected with
3061          * pending_pool_lock.
3062          */
3063         spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3064         list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3065
3066                 if (cmd->scsi_cmd == scsi_cmd) {
3067                         cmd_found = 1;
3068                         break;
3069                 }
3070         }
3071
3072         spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3073                                 pending_lock_flags);
3074
3075         /* If the command to be aborted was given to IOA and still pending with
3076          * it, send ABORT_TASK to abort this and wait for its completion
3077          */
3078         if (cmd_found)
3079                 cancel_cmd = pmcraid_abort_cmd(cmd);
3080
3081         spin_unlock_irqrestore(pinstance->host->host_lock,
3082                                host_lock_flags);
3083
3084         if (cancel_cmd) {
3085                 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3086                 rc = pmcraid_abort_complete(cancel_cmd);
3087         }
3088
3089         return cmd_found ? rc : SUCCESS;
3090 }
3091
3092 /**
3093  * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3094  *
3095  * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3096  *
3097  * All these routines invokve pmcraid_reset_device with appropriate parameters.
3098  * Since these are called from mid-layer EH thread, no other IO will be queued
3099  * to the resource being reset. However, control path (IOCTL) may be active so
3100  * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3101  * takes care by locking/unlocking host_lock.
3102  *
3103  * Return value
3104  *      SUCCESS or FAILED
3105  */
3106 static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3107 {
3108         scmd_printk(KERN_INFO, scmd,
3109                     "resetting device due to an I/O command timeout.\n");
3110         return pmcraid_reset_device(scmd,
3111                                     PMCRAID_INTERNAL_TIMEOUT,
3112                                     RESET_DEVICE_LUN);
3113 }
3114
3115 static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3116 {
3117         scmd_printk(KERN_INFO, scmd,
3118                     "Doing bus reset due to an I/O command timeout.\n");
3119         return pmcraid_reset_device(scmd,
3120                                     PMCRAID_RESET_BUS_TIMEOUT,
3121                                     RESET_DEVICE_BUS);
3122 }
3123
3124 static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3125 {
3126         scmd_printk(KERN_INFO, scmd,
3127                     "Doing target reset due to an I/O command timeout.\n");
3128         return pmcraid_reset_device(scmd,
3129                                     PMCRAID_INTERNAL_TIMEOUT,
3130                                     RESET_DEVICE_TARGET);
3131 }
3132
3133 /**
3134  * pmcraid_eh_host_reset_handler - adapter reset handler callback
3135  *
3136  * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3137  *
3138  * Initiates adapter reset to bring it up to operational state
3139  *
3140  * Return value
3141  *      SUCCESS or FAILED
3142  */
3143 static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3144 {
3145         unsigned long interval = 10000; /* 10 seconds interval */
3146         int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3147         struct pmcraid_instance *pinstance =
3148                 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3149
3150
3151         /* wait for an additional 150 seconds just in case firmware could come
3152          * up and if it could complete all the pending commands excluding the
3153          * two HCAM (CCN and LDN).
3154          */
3155         while (waits--) {
3156                 if (atomic_read(&pinstance->outstanding_cmds) <=
3157                     PMCRAID_MAX_HCAM_CMD)
3158                         return SUCCESS;
3159                 msleep(interval);
3160         }
3161
3162         dev_err(&pinstance->pdev->dev,
3163                 "Adapter being reset due to an I/O command timeout.\n");
3164         return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3165 }
3166
3167 /**
3168  * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
3169  * @scsi_cmd:   scsi command struct
3170  *
3171  * Return value
3172  *        number of tags or 0 if the task is not tagged
3173  */
3174 static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
3175 {
3176         char tag[2];
3177         u8 rc = 0;
3178
3179         if (scsi_populate_tag_msg(scsi_cmd, tag)) {
3180                 switch (tag[0]) {
3181                 case MSG_SIMPLE_TAG:
3182                         rc = TASK_TAG_SIMPLE;
3183                         break;
3184                 case MSG_HEAD_TAG:
3185                         rc = TASK_TAG_QUEUE_HEAD;
3186                         break;
3187                 case MSG_ORDERED_TAG:
3188                         rc = TASK_TAG_ORDERED;
3189                         break;
3190                 };
3191         }
3192
3193         return rc;
3194 }
3195
3196
3197 /**
3198  * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3199  * @cmd: pmcraid command struct
3200  * @sgcount: count of scatter-gather elements
3201  *
3202  * Return value
3203  *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
3204  *   or external IOADLs
3205  */
3206 struct pmcraid_ioadl_desc *
3207 pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3208 {
3209         struct pmcraid_ioadl_desc *ioadl;
3210         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3211         int ioadl_count = 0;
3212
3213         if (ioarcb->add_cmd_param_length)
3214                 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3215         ioarcb->ioadl_length =
3216                 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3217
3218         if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3219                 /* external ioadls start at offset 0x80 from control_block
3220                  * structure, re-using 24 out of 27 ioadls part of IOARCB.
3221                  * It is necessary to indicate to firmware that driver is
3222                  * using ioadls to be treated as external to IOARCB.
3223                  */
3224                 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3225                 ioarcb->ioadl_bus_addr =
3226                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3227                                 offsetof(struct pmcraid_ioarcb,
3228                                         add_data.u.ioadl[3]));
3229                 ioadl = &ioarcb->add_data.u.ioadl[3];
3230         } else {
3231                 ioarcb->ioadl_bus_addr =
3232                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3233                                 offsetof(struct pmcraid_ioarcb,
3234                                         add_data.u.ioadl[ioadl_count]));
3235
3236                 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3237                 ioarcb->ioarcb_bus_addr |=
3238                                 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3239         }
3240
3241         return ioadl;
3242 }
3243
3244 /**
3245  * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3246  * @pinstance: pointer to adapter instance structure
3247  * @cmd: pmcraid command struct
3248  *
3249  * This function is invoked by queuecommand entry point while sending a command
3250  * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3251  *
3252  * Return value:
3253  *      0 on success or -1 on failure
3254  */
3255 static int pmcraid_build_ioadl(
3256         struct pmcraid_instance *pinstance,
3257         struct pmcraid_cmd *cmd
3258 )
3259 {
3260         int i, nseg;
3261         struct scatterlist *sglist;
3262
3263         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3264         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3265         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3266
3267         u32 length = scsi_bufflen(scsi_cmd);
3268
3269         if (!length)
3270                 return 0;
3271
3272         nseg = scsi_dma_map(scsi_cmd);
3273
3274         if (nseg < 0) {
3275                 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3276                 return -1;
3277         } else if (nseg > PMCRAID_MAX_IOADLS) {
3278                 scsi_dma_unmap(scsi_cmd);
3279                 scmd_printk(KERN_ERR, scsi_cmd,
3280                         "sg count is (%d) more than allowed!\n", nseg);
3281                 return -1;
3282         }
3283
3284         /* Initialize IOARCB data transfer length fields */
3285         if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3286                 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3287
3288         ioarcb->request_flags0 |= NO_LINK_DESCS;
3289         ioarcb->data_transfer_length = cpu_to_le32(length);
3290         ioadl = pmcraid_init_ioadls(cmd, nseg);
3291
3292         /* Initialize IOADL descriptor addresses */
3293         scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3294                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3295                 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3296                 ioadl[i].flags = 0;
3297         }
3298         /* setup last descriptor */
3299         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3300
3301         return 0;
3302 }
3303
3304 /**
3305  * pmcraid_free_sglist - Frees an allocated SG buffer list
3306  * @sglist: scatter/gather list pointer
3307  *
3308  * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3309  *
3310  * Return value:
3311  *      none
3312  */
3313 static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3314 {
3315         int i;
3316
3317         for (i = 0; i < sglist->num_sg; i++)
3318                 __free_pages(sg_page(&(sglist->scatterlist[i])),
3319                              sglist->order);
3320
3321         kfree(sglist);
3322 }
3323
3324 /**
3325  * pmcraid_alloc_sglist - Allocates memory for a SG list
3326  * @buflen: buffer length
3327  *
3328  * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3329  * list.
3330  *
3331  * Return value
3332  *      pointer to sglist / NULL on failure
3333  */
3334 static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3335 {
3336         struct pmcraid_sglist *sglist;
3337         struct scatterlist *scatterlist;
3338         struct page *page;
3339         int num_elem, i, j;
3340         int sg_size;
3341         int order;
3342         int bsize_elem;
3343
3344         sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3345         order = (sg_size > 0) ? get_order(sg_size) : 0;
3346         bsize_elem = PAGE_SIZE * (1 << order);
3347
3348         /* Determine the actual number of sg entries needed */
3349         if (buflen % bsize_elem)
3350                 num_elem = (buflen / bsize_elem) + 1;
3351         else
3352                 num_elem = buflen / bsize_elem;
3353
3354         /* Allocate a scatter/gather list for the DMA */
3355         sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3356                          (sizeof(struct scatterlist) * (num_elem - 1)),
3357                          GFP_KERNEL);
3358
3359         if (sglist == NULL)
3360                 return NULL;
3361
3362         scatterlist = sglist->scatterlist;
3363         sg_init_table(scatterlist, num_elem);
3364         sglist->order = order;
3365         sglist->num_sg = num_elem;
3366         sg_size = buflen;
3367
3368         for (i = 0; i < num_elem; i++) {
3369                 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3370                 if (!page) {
3371                         for (j = i - 1; j >= 0; j--)
3372                                 __free_pages(sg_page(&scatterlist[j]), order);
3373                         kfree(sglist);
3374                         return NULL;
3375                 }
3376
3377                 sg_set_page(&scatterlist[i], page,
3378                         sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3379                 sg_size -= bsize_elem;
3380         }
3381
3382         return sglist;
3383 }
3384
3385 /**
3386  * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3387  * @sglist: scatter/gather list pointer
3388  * @buffer: buffer pointer
3389  * @len: buffer length
3390  * @direction: data transfer direction
3391  *
3392  * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3393  *
3394  * Return value:
3395  * 0 on success / other on failure
3396  */
3397 static int pmcraid_copy_sglist(
3398         struct pmcraid_sglist *sglist,
3399         unsigned long buffer,
3400         u32 len,
3401         int direction
3402 )
3403 {
3404         struct scatterlist *scatterlist;
3405         void *kaddr;
3406         int bsize_elem;
3407         int i;
3408         int rc = 0;
3409
3410         /* Determine the actual number of bytes per element */
3411         bsize_elem = PAGE_SIZE * (1 << sglist->order);
3412
3413         scatterlist = sglist->scatterlist;
3414
3415         for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3416                 struct page *page = sg_page(&scatterlist[i]);
3417
3418                 kaddr = kmap(page);
3419                 if (direction == DMA_TO_DEVICE)
3420                         rc = __copy_from_user(kaddr,
3421                                               (void *)buffer,
3422                                               bsize_elem);
3423                 else
3424                         rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3425
3426                 kunmap(page);
3427
3428                 if (rc) {
3429                         pmcraid_err("failed to copy user data into sg list\n");
3430                         return -EFAULT;
3431                 }
3432
3433                 scatterlist[i].length = bsize_elem;
3434         }
3435
3436         if (len % bsize_elem) {
3437                 struct page *page = sg_page(&scatterlist[i]);
3438
3439                 kaddr = kmap(page);
3440
3441                 if (direction == DMA_TO_DEVICE)
3442                         rc = __copy_from_user(kaddr,
3443                                               (void *)buffer,
3444                                               len % bsize_elem);
3445                 else
3446                         rc = __copy_to_user((void *)buffer,
3447                                             kaddr,
3448                                             len % bsize_elem);
3449
3450                 kunmap(page);
3451
3452                 scatterlist[i].length = len % bsize_elem;
3453         }
3454
3455         if (rc) {
3456                 pmcraid_err("failed to copy user data into sg list\n");
3457                 rc = -EFAULT;
3458         }
3459
3460         return rc;
3461 }
3462
3463 /**
3464  * pmcraid_queuecommand - Queue a mid-layer request
3465  * @scsi_cmd: scsi command struct
3466  * @done: done function
3467  *
3468  * This function queues a request generated by the mid-layer. Midlayer calls
3469  * this routine within host->lock. Some of the functions called by queuecommand
3470  * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3471  *
3472  * Return value:
3473  *        0 on success
3474  *        SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3475  *        SCSI_MLQUEUE_HOST_BUSY if host is busy
3476  */
3477 static int pmcraid_queuecommand_lck(
3478         struct scsi_cmnd *scsi_cmd,
3479         void (*done) (struct scsi_cmnd *)
3480 )
3481 {
3482         struct pmcraid_instance *pinstance;
3483         struct pmcraid_resource_entry *res;
3484         struct pmcraid_ioarcb *ioarcb;
3485         struct pmcraid_cmd *cmd;
3486         u32 fw_version;
3487         int rc = 0;
3488
3489         pinstance =
3490                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3491         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3492         scsi_cmd->scsi_done = done;
3493         res = scsi_cmd->device->hostdata;
3494         scsi_cmd->result = (DID_OK << 16);
3495
3496         /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3497          * the command
3498          */
3499         if (pinstance->ioa_state == IOA_STATE_DEAD) {
3500                 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3501                 scsi_cmd->result = (DID_NO_CONNECT << 16);
3502                 scsi_cmd->scsi_done(scsi_cmd);
3503                 return 0;
3504         }
3505
3506         /* If IOA reset is in progress, can't queue the commands */
3507         if (pinstance->ioa_reset_in_progress)
3508                 return SCSI_MLQUEUE_HOST_BUSY;
3509
3510         /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3511          * the command here itself with success return
3512          */
3513         if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3514                 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3515                 scsi_cmd->scsi_done(scsi_cmd);
3516                 return 0;
3517         }
3518
3519         /* initialize the command and IOARCB to be sent to IOA */
3520         cmd = pmcraid_get_free_cmd(pinstance);
3521
3522         if (cmd == NULL) {
3523                 pmcraid_err("free command block is not available\n");
3524                 return SCSI_MLQUEUE_HOST_BUSY;
3525         }
3526
3527         cmd->scsi_cmd = scsi_cmd;
3528         ioarcb = &(cmd->ioa_cb->ioarcb);
3529         memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3530         ioarcb->resource_handle = res->cfg_entry.resource_handle;
3531         ioarcb->request_type = REQ_TYPE_SCSI;
3532
3533         /* set hrrq number where the IOA should respond to. Note that all cmds
3534          * generated internally uses hrrq_id 0, exception to this is the cmd
3535          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3536          * hrrq_id assigned here in queuecommand
3537          */
3538         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3539                           pinstance->num_hrrq;
3540         cmd->cmd_done = pmcraid_io_done;
3541
3542         if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3543                 if (scsi_cmd->underflow == 0)
3544                         ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3545
3546                 if (res->sync_reqd) {
3547                         ioarcb->request_flags0 |= SYNC_COMPLETE;
3548                         res->sync_reqd = 0;
3549                 }
3550
3551                 ioarcb->request_flags0 |= NO_LINK_DESCS;
3552                 ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
3553
3554                 if (RES_IS_GSCSI(res->cfg_entry))
3555                         ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3556         }
3557
3558         rc = pmcraid_build_ioadl(pinstance, cmd);
3559
3560         pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3561                      le32_to_cpu(ioarcb->response_handle) >> 2,
3562                      scsi_cmd->cmnd[0], pinstance->host->unique_id,
3563                      RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3564                         PMCRAID_PHYS_BUS_ID,
3565                      RES_IS_VSET(res->cfg_entry) ?
3566                         (fw_version <= PMCRAID_FW_VERSION_1 ?
3567                                 res->cfg_entry.unique_flags1 :
3568                                         res->cfg_entry.array_id & 0xFF) :
3569                         RES_TARGET(res->cfg_entry.resource_address),
3570                      RES_LUN(res->cfg_entry.resource_address));
3571
3572         if (likely(rc == 0)) {
3573                 _pmcraid_fire_command(cmd);
3574         } else {
3575                 pmcraid_err("queuecommand could not build ioadl\n");
3576                 pmcraid_return_cmd(cmd);
3577                 rc = SCSI_MLQUEUE_HOST_BUSY;
3578         }
3579
3580         return rc;
3581 }
3582
3583 static DEF_SCSI_QCMD(pmcraid_queuecommand)
3584
3585 /**
3586  * pmcraid_open -char node "open" entry, allowed only users with admin access
3587  */
3588 static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3589 {
3590         struct pmcraid_instance *pinstance;
3591
3592         if (!capable(CAP_SYS_ADMIN))
3593                 return -EACCES;
3594
3595         /* Populate adapter instance * pointer for use by ioctl */
3596         pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3597         filep->private_data = pinstance;
3598
3599         return 0;
3600 }
3601
3602 /**
3603  * pmcraid_release - char node "release" entry point
3604  */
3605 static int pmcraid_chr_release(struct inode *inode, struct file *filep)
3606 {
3607         struct pmcraid_instance *pinstance = filep->private_data;
3608
3609         filep->private_data = NULL;
3610         fasync_helper(-1, filep, 0, &pinstance->aen_queue);
3611
3612         return 0;
3613 }
3614
3615 /**
3616  * pmcraid_fasync - Async notifier registration from applications
3617  *
3618  * This function adds the calling process to a driver global queue. When an
3619  * event occurs, SIGIO will be sent to all processes in this queue.
3620  */
3621 static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3622 {
3623         struct pmcraid_instance *pinstance;
3624         int rc;
3625
3626         pinstance = filep->private_data;
3627         mutex_lock(&pinstance->aen_queue_lock);
3628         rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3629         mutex_unlock(&pinstance->aen_queue_lock);
3630
3631         return rc;
3632 }
3633
3634
3635 /**
3636  * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3637  * commands sent over IOCTL interface
3638  *
3639  * @cmd       : pointer to struct pmcraid_cmd
3640  * @buflen    : length of the request buffer
3641  * @direction : data transfer direction
3642  *
3643  * Return value
3644  *  0 on success, non-zero error code on failure
3645  */
3646 static int pmcraid_build_passthrough_ioadls(
3647         struct pmcraid_cmd *cmd,
3648         int buflen,
3649         int direction
3650 )
3651 {
3652         struct pmcraid_sglist *sglist = NULL;
3653         struct scatterlist *sg = NULL;
3654         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3655         struct pmcraid_ioadl_desc *ioadl;
3656         int i;
3657
3658         sglist = pmcraid_alloc_sglist(buflen);
3659
3660         if (!sglist) {
3661                 pmcraid_err("can't allocate memory for passthrough SGls\n");
3662                 return -ENOMEM;
3663         }
3664
3665         sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3666                                         sglist->scatterlist,
3667                                         sglist->num_sg, direction);
3668
3669         if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3670                 dev_err(&cmd->drv_inst->pdev->dev,
3671                         "Failed to map passthrough buffer!\n");
3672                 pmcraid_free_sglist(sglist);
3673                 return -EIO;
3674         }
3675
3676         cmd->sglist = sglist;
3677         ioarcb->request_flags0 |= NO_LINK_DESCS;
3678
3679         ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3680
3681         /* Initialize IOADL descriptor addresses */
3682         for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3683                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3684                 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3685                 ioadl[i].flags = 0;
3686         }
3687
3688         /* setup the last descriptor */
3689         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3690
3691         return 0;
3692 }
3693
3694
3695 /**
3696  * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3697  *
3698  * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3699  * @buflen: size of the request buffer
3700  * @direction: data transfer direction
3701  *
3702  * Return value
3703  *  0 on success, non-zero error code on failure
3704  */
3705 static void pmcraid_release_passthrough_ioadls(
3706         struct pmcraid_cmd *cmd,
3707         int buflen,
3708         int direction
3709 )
3710 {
3711         struct pmcraid_sglist *sglist = cmd->sglist;
3712
3713         if (buflen > 0) {
3714                 pci_unmap_sg(cmd->drv_inst->pdev,
3715                              sglist->scatterlist,
3716                              sglist->num_sg,
3717                              direction);
3718                 pmcraid_free_sglist(sglist);
3719                 cmd->sglist = NULL;
3720         }
3721 }
3722
3723 /**
3724  * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3725  *
3726  * @pinstance: pointer to adapter instance structure
3727  * @cmd: ioctl code
3728  * @arg: pointer to pmcraid_passthrough_buffer user buffer
3729  *
3730  * Return value
3731  *  0 on success, non-zero error code on failure
3732  */
3733 static long pmcraid_ioctl_passthrough(
3734         struct pmcraid_instance *pinstance,
3735         unsigned int ioctl_cmd,
3736         unsigned int buflen,
3737         unsigned long arg
3738 )
3739 {
3740         struct pmcraid_passthrough_ioctl_buffer *buffer;
3741         struct pmcraid_ioarcb *ioarcb;
3742         struct pmcraid_cmd *cmd;
3743         struct pmcraid_cmd *cancel_cmd;
3744         unsigned long request_buffer;
3745         unsigned long request_offset;
3746         unsigned long lock_flags;
3747         void *ioasa;
3748         u32 ioasc;
3749         int request_size;
3750         int buffer_size;
3751         u8 access, direction;
3752         int rc = 0;
3753
3754         /* If IOA reset is in progress, wait 10 secs for reset to complete */
3755         if (pinstance->ioa_reset_in_progress) {
3756                 rc = wait_event_interruptible_timeout(
3757                                 pinstance->reset_wait_q,
3758                                 !pinstance->ioa_reset_in_progress,
3759                                 msecs_to_jiffies(10000));
3760
3761                 if (!rc)
3762                         return -ETIMEDOUT;
3763                 else if (rc < 0)
3764                         return -ERESTARTSYS;
3765         }
3766
3767         /* If adapter is not in operational state, return error */
3768         if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3769                 pmcraid_err("IOA is not operational\n");
3770                 return -ENOTTY;
3771         }
3772
3773         buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3774         buffer = kmalloc(buffer_size, GFP_KERNEL);
3775
3776         if (!buffer) {
3777                 pmcraid_err("no memory for passthrough buffer\n");
3778                 return -ENOMEM;
3779         }
3780
3781         request_offset =
3782             offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3783
3784         request_buffer = arg + request_offset;
3785
3786         rc = __copy_from_user(buffer,
3787                              (struct pmcraid_passthrough_ioctl_buffer *) arg,
3788                              sizeof(struct pmcraid_passthrough_ioctl_buffer));
3789
3790         ioasa =
3791         (void *)(arg +
3792                 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3793
3794         if (rc) {
3795                 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3796                 rc = -EFAULT;
3797                 goto out_free_buffer;
3798         }
3799
3800         request_size = buffer->ioarcb.data_transfer_length;
3801
3802         if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3803                 access = VERIFY_READ;
3804                 direction = DMA_TO_DEVICE;
3805         } else {
3806                 access = VERIFY_WRITE;
3807                 direction = DMA_FROM_DEVICE;
3808         }
3809
3810         if (request_size > 0) {
3811                 rc = access_ok(access, arg, request_offset + request_size);
3812
3813                 if (!rc) {
3814                         rc = -EFAULT;
3815                         goto out_free_buffer;
3816                 }
3817         }
3818
3819         /* check if we have any additional command parameters */
3820         if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3821                 rc = -EINVAL;
3822                 goto out_free_buffer;
3823         }
3824
3825         cmd = pmcraid_get_free_cmd(pinstance);
3826
3827         if (!cmd) {
3828                 pmcraid_err("free command block is not available\n");
3829                 rc = -ENOMEM;
3830                 goto out_free_buffer;
3831         }
3832
3833         cmd->scsi_cmd = NULL;
3834         ioarcb = &(cmd->ioa_cb->ioarcb);
3835
3836         /* Copy the user-provided IOARCB stuff field by field */
3837         ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3838         ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3839         ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3840         ioarcb->request_type = buffer->ioarcb.request_type;
3841         ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3842         ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3843         memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3844
3845         if (buffer->ioarcb.add_cmd_param_length) {
3846                 ioarcb->add_cmd_param_length =
3847                         buffer->ioarcb.add_cmd_param_length;
3848                 ioarcb->add_cmd_param_offset =
3849                         buffer->ioarcb.add_cmd_param_offset;
3850                 memcpy(ioarcb->add_data.u.add_cmd_params,
3851                         buffer->ioarcb.add_data.u.add_cmd_params,
3852                         buffer->ioarcb.add_cmd_param_length);
3853         }
3854
3855         /* set hrrq number where the IOA should respond to. Note that all cmds
3856          * generated internally uses hrrq_id 0, exception to this is the cmd
3857          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3858          * hrrq_id assigned here in queuecommand
3859          */
3860         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3861                           pinstance->num_hrrq;
3862
3863         if (request_size) {
3864                 rc = pmcraid_build_passthrough_ioadls(cmd,
3865                                                       request_size,
3866                                                       direction);
3867                 if (rc) {
3868                         pmcraid_err("couldn't build passthrough ioadls\n");
3869                         goto out_free_buffer;
3870                 }
3871         }
3872
3873         /* If data is being written into the device, copy the data from user
3874          * buffers
3875          */
3876         if (direction == DMA_TO_DEVICE && request_size > 0) {
3877                 rc = pmcraid_copy_sglist(cmd->sglist,
3878                                          request_buffer,
3879                                          request_size,
3880                                          direction);
3881                 if (rc) {
3882                         pmcraid_err("failed to copy user buffer\n");
3883                         goto out_free_sglist;
3884                 }
3885         }
3886
3887         /* passthrough ioctl is a blocking command so, put the user to sleep
3888          * until timeout. Note that a timeout value of 0 means, do timeout.
3889          */
3890         cmd->cmd_done = pmcraid_internal_done;
3891         init_completion(&cmd->wait_for_completion);
3892         cmd->completion_req = 1;
3893
3894         pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3895                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3896                      cmd->ioa_cb->ioarcb.cdb[0],
3897                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3898
3899         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3900         _pmcraid_fire_command(cmd);
3901         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3902
3903         /* NOTE ! Remove the below line once abort_task is implemented
3904          * in firmware. This line disables ioctl command timeout handling logic
3905          * similar to IO command timeout handling, making ioctl commands to wait
3906          * until the command completion regardless of timeout value specified in
3907          * ioarcb
3908          */
3909         buffer->ioarcb.cmd_timeout = 0;
3910
3911         /* If command timeout is specified put caller to wait till that time,
3912          * otherwise it would be blocking wait. If command gets timed out, it
3913          * will be aborted.
3914          */
3915         if (buffer->ioarcb.cmd_timeout == 0) {
3916                 wait_for_completion(&cmd->wait_for_completion);
3917         } else if (!wait_for_completion_timeout(
3918                         &cmd->wait_for_completion,
3919                         msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3920
3921                 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3922                         le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3923                         cmd->ioa_cb->ioarcb.cdb[0]);
3924
3925                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3926                 cancel_cmd = pmcraid_abort_cmd(cmd);
3927                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3928
3929                 if (cancel_cmd) {
3930                         wait_for_completion(&cancel_cmd->wait_for_completion);
3931                         ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3932                         pmcraid_return_cmd(cancel_cmd);
3933
3934                         /* if abort task couldn't find the command i.e it got
3935                          * completed prior to aborting, return good completion.
3936                          * if command got aborted succesfully or there was IOA
3937                          * reset due to abort task itself getting timedout then
3938                          * return -ETIMEDOUT
3939                          */
3940                         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3941                             PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3942                                 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3943                                         rc = -ETIMEDOUT;
3944                                 goto out_handle_response;
3945                         }
3946                 }
3947
3948                 /* no command block for abort task or abort task failed to abort
3949                  * the IOARCB, then wait for 150 more seconds and initiate reset
3950                  * sequence after timeout
3951                  */
3952                 if (!wait_for_completion_timeout(
3953                         &cmd->wait_for_completion,
3954                         msecs_to_jiffies(150 * 1000))) {
3955                         pmcraid_reset_bringup(cmd->drv_inst);
3956                         rc = -ETIMEDOUT;
3957                 }
3958         }
3959
3960 out_handle_response:
3961         /* copy entire IOASA buffer and return IOCTL success.
3962          * If copying IOASA to user-buffer fails, return
3963          * EFAULT
3964          */
3965         if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3966                 sizeof(struct pmcraid_ioasa))) {
3967                 pmcraid_err("failed to copy ioasa buffer to user\n");
3968                 rc = -EFAULT;
3969         }
3970
3971         /* If the data transfer was from device, copy the data onto user
3972          * buffers
3973          */
3974         else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3975                 rc = pmcraid_copy_sglist(cmd->sglist,
3976                                          request_buffer,
3977                                          request_size,
3978                                          direction);
3979                 if (rc) {
3980                         pmcraid_err("failed to copy user buffer\n");
3981                         rc = -EFAULT;
3982                 }
3983         }
3984
3985 out_free_sglist:
3986         pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3987         pmcraid_return_cmd(cmd);
3988
3989 out_free_buffer:
3990         kfree(buffer);
3991
3992         return rc;
3993 }
3994
3995
3996
3997
3998 /**
3999  * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
4000  *
4001  * @pinstance: pointer to adapter instance structure
4002  * @cmd: ioctl command passed in
4003  * @buflen: length of user_buffer
4004  * @user_buffer: user buffer pointer
4005  *
4006  * Return Value
4007  *   0 in case of success, otherwise appropriate error code
4008  */
4009 static long pmcraid_ioctl_driver(
4010         struct pmcraid_instance *pinstance,
4011         unsigned int cmd,
4012         unsigned int buflen,
4013         void __user *user_buffer
4014 )
4015 {
4016         int rc = -ENOSYS;
4017
4018         if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
4019                 pmcraid_err("ioctl_driver: access fault in request buffer\n");
4020                 return -EFAULT;
4021         }
4022
4023         switch (cmd) {
4024         case PMCRAID_IOCTL_RESET_ADAPTER:
4025                 pmcraid_reset_bringup(pinstance);
4026                 rc = 0;
4027                 break;
4028
4029         default:
4030                 break;
4031         }
4032
4033         return rc;
4034 }
4035
4036 /**
4037  * pmcraid_check_ioctl_buffer - check for proper access to user buffer
4038  *
4039  * @cmd: ioctl command
4040  * @arg: user buffer
4041  * @hdr: pointer to kernel memory for pmcraid_ioctl_header
4042  *
4043  * Return Value
4044  *      negetive error code if there are access issues, otherwise zero.
4045  *      Upon success, returns ioctl header copied out of user buffer.
4046  */
4047
4048 static int pmcraid_check_ioctl_buffer(
4049         int cmd,
4050         void __user *arg,
4051         struct pmcraid_ioctl_header *hdr
4052 )
4053 {
4054         int rc = 0;
4055         int access = VERIFY_READ;
4056
4057         if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
4058                 pmcraid_err("couldn't copy ioctl header from user buffer\n");
4059                 return -EFAULT;
4060         }
4061
4062         /* check for valid driver signature */
4063         rc = memcmp(hdr->signature,
4064                     PMCRAID_IOCTL_SIGNATURE,
4065                     sizeof(hdr->signature));
4066         if (rc) {
4067                 pmcraid_err("signature verification failed\n");
4068                 return -EINVAL;
4069         }
4070
4071         /* check for appropriate buffer access */
4072         if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4073                 access = VERIFY_WRITE;
4074
4075         rc = access_ok(access,
4076                        (arg + sizeof(struct pmcraid_ioctl_header)),
4077                        hdr->buffer_length);
4078         if (!rc) {
4079                 pmcraid_err("access failed for user buffer of size %d\n",
4080                              hdr->buffer_length);
4081                 return -EFAULT;
4082         }
4083
4084         return 0;
4085 }
4086
4087 /**
4088  *  pmcraid_ioctl - char node ioctl entry point
4089  */
4090 static long pmcraid_chr_ioctl(
4091         struct file *filep,
4092         unsigned int cmd,
4093         unsigned long arg
4094 )
4095 {
4096         struct pmcraid_instance *pinstance = NULL;
4097         struct pmcraid_ioctl_header *hdr = NULL;
4098         int retval = -ENOTTY;
4099
4100         hdr = kmalloc(GFP_KERNEL, sizeof(struct pmcraid_ioctl_header));
4101
4102         if (!hdr) {
4103                 pmcraid_err("faile to allocate memory for ioctl header\n");
4104                 return -ENOMEM;
4105         }
4106
4107         retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4108
4109         if (retval) {
4110                 pmcraid_info("chr_ioctl: header check failed\n");
4111                 kfree(hdr);
4112                 return retval;
4113         }
4114
4115         pinstance = filep->private_data;
4116
4117         if (!pinstance) {
4118                 pmcraid_info("adapter instance is not found\n");
4119                 kfree(hdr);
4120                 return -ENOTTY;
4121         }
4122
4123         switch (_IOC_TYPE(cmd)) {
4124
4125         case PMCRAID_PASSTHROUGH_IOCTL:
4126                 /* If ioctl code is to download microcode, we need to block
4127                  * mid-layer requests.
4128                  */
4129                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4130                         scsi_block_requests(pinstance->host);
4131
4132                 retval = pmcraid_ioctl_passthrough(pinstance,
4133                                                    cmd,
4134                                                    hdr->buffer_length,
4135                                                    arg);
4136
4137                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4138                         scsi_unblock_requests(pinstance->host);
4139                 break;
4140
4141         case PMCRAID_DRIVER_IOCTL:
4142                 arg += sizeof(struct pmcraid_ioctl_header);
4143                 retval = pmcraid_ioctl_driver(pinstance,
4144                                               cmd,
4145                                               hdr->buffer_length,
4146                                               (void __user *)arg);
4147                 break;
4148
4149         default:
4150                 retval = -ENOTTY;
4151                 break;
4152         }
4153
4154         kfree(hdr);
4155
4156         return retval;
4157 }
4158
4159 /**
4160  * File operations structure for management interface
4161  */
4162 static const struct file_operations pmcraid_fops = {
4163         .owner = THIS_MODULE,
4164         .open = pmcraid_chr_open,
4165         .release = pmcraid_chr_release,
4166         .fasync = pmcraid_chr_fasync,
4167         .unlocked_ioctl = pmcraid_chr_ioctl,
4168 #ifdef CONFIG_COMPAT
4169         .compat_ioctl = pmcraid_chr_ioctl,
4170 #endif
4171         .llseek = noop_llseek,
4172 };
4173
4174
4175
4176
4177 /**
4178  * pmcraid_show_log_level - Display adapter's error logging level
4179  * @dev: class device struct
4180  * @buf: buffer
4181  *
4182  * Return value:
4183  *  number of bytes printed to buffer
4184  */
4185 static ssize_t pmcraid_show_log_level(
4186         struct device *dev,
4187         struct device_attribute *attr,
4188         char *buf)
4189 {
4190         struct Scsi_Host *shost = class_to_shost(dev);
4191         struct pmcraid_instance *pinstance =
4192                 (struct pmcraid_instance *)shost->hostdata;
4193         return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4194 }
4195
4196 /**
4197  * pmcraid_store_log_level - Change the adapter's error logging level
4198  * @dev: class device struct
4199  * @buf: buffer
4200  * @count: not used
4201  *
4202  * Return value:
4203  *  number of bytes printed to buffer
4204  */
4205 static ssize_t pmcraid_store_log_level(
4206         struct device *dev,
4207         struct device_attribute *attr,
4208         const char *buf,
4209         size_t count
4210 )
4211 {
4212         struct Scsi_Host *shost;
4213         struct pmcraid_instance *pinstance;
4214         unsigned long val;
4215
4216         if (strict_strtoul(buf, 10, &val))
4217                 return -EINVAL;
4218         /* log-level should be from 0 to 2 */
4219         if (val > 2)
4220                 return -EINVAL;
4221
4222         shost = class_to_shost(dev);
4223         pinstance = (struct pmcraid_instance *)shost->hostdata;
4224         pinstance->current_log_level = val;
4225
4226         return strlen(buf);
4227 }
4228
4229 static struct device_attribute pmcraid_log_level_attr = {
4230         .attr = {
4231                  .name = "log_level",
4232                  .mode = S_IRUGO | S_IWUSR,
4233                  },
4234         .show = pmcraid_show_log_level,
4235         .store = pmcraid_store_log_level,
4236 };
4237
4238 /**
4239  * pmcraid_show_drv_version - Display driver version
4240  * @dev: class device struct
4241  * @buf: buffer
4242  *
4243  * Return value:
4244  *  number of bytes printed to buffer
4245  */
4246 static ssize_t pmcraid_show_drv_version(
4247         struct device *dev,
4248         struct device_attribute *attr,
4249         char *buf
4250 )
4251 {
4252         return snprintf(buf, PAGE_SIZE, "version: %s, build date: %s\n",
4253                         PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE);
4254 }
4255
4256 static struct device_attribute pmcraid_driver_version_attr = {
4257         .attr = {
4258                  .name = "drv_version",
4259                  .mode = S_IRUGO,
4260                  },
4261         .show = pmcraid_show_drv_version,
4262 };
4263
4264 /**
4265  * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4266  * @dev: class device struct
4267  * @buf: buffer
4268  *
4269  * Return value:
4270  *  number of bytes printed to buffer
4271  */
4272 static ssize_t pmcraid_show_adapter_id(
4273         struct device *dev,
4274         struct device_attribute *attr,
4275         char *buf
4276 )
4277 {
4278         struct Scsi_Host *shost = class_to_shost(dev);
4279         struct pmcraid_instance *pinstance =
4280                 (struct pmcraid_instance *)shost->hostdata;
4281         u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4282                 pinstance->pdev->devfn;
4283         u32 aen_group = pmcraid_event_family.id;
4284
4285         return snprintf(buf, PAGE_SIZE,
4286                         "adapter id: %d\nminor: %d\naen group: %d\n",
4287                         adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4288 }
4289
4290 static struct device_attribute pmcraid_adapter_id_attr = {
4291         .attr = {
4292                  .name = "adapter_id",
4293                  .mode = S_IRUGO | S_IWUSR,
4294                  },
4295         .show = pmcraid_show_adapter_id,
4296 };
4297
4298 static struct device_attribute *pmcraid_host_attrs[] = {
4299         &pmcraid_log_level_attr,
4300         &pmcraid_driver_version_attr,
4301         &pmcraid_adapter_id_attr,
4302         NULL,
4303 };
4304
4305
4306 /* host template structure for pmcraid driver */
4307 static struct scsi_host_template pmcraid_host_template = {
4308         .module = THIS_MODULE,
4309         .name = PMCRAID_DRIVER_NAME,
4310         .queuecommand = pmcraid_queuecommand,
4311         .eh_abort_handler = pmcraid_eh_abort_handler,
4312         .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4313         .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4314         .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4315         .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4316
4317         .slave_alloc = pmcraid_slave_alloc,
4318         .slave_configure = pmcraid_slave_configure,
4319         .slave_destroy = pmcraid_slave_destroy,
4320         .change_queue_depth = pmcraid_change_queue_depth,
4321         .change_queue_type  = pmcraid_change_queue_type,
4322         .can_queue = PMCRAID_MAX_IO_CMD,
4323         .this_id = -1,
4324         .sg_tablesize = PMCRAID_MAX_IOADLS,
4325         .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4326         .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4327         .use_clustering = ENABLE_CLUSTERING,
4328         .shost_attrs = pmcraid_host_attrs,
4329         .proc_name = PMCRAID_DRIVER_NAME
4330 };
4331
4332 /*
4333  * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4334  * @irq: interrupt vector number
4335  * @dev_id: pointer hrrq_vector
4336  *
4337  * Return Value
4338  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4339  */
4340
4341 static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4342 {
4343         struct pmcraid_isr_param *hrrq_vector;
4344         struct pmcraid_instance *pinstance;
4345         unsigned long lock_flags;
4346         u32 intrs_val;
4347         int hrrq_id;
4348
4349         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4350         hrrq_id = hrrq_vector->hrrq_id;
4351         pinstance = hrrq_vector->drv_inst;
4352
4353         if (!hrrq_id) {
4354                 /* Read the interrupt */
4355                 intrs_val = pmcraid_read_interrupts(pinstance);
4356                 if (intrs_val &&
4357                         ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4358                         & DOORBELL_INTR_MSIX_CLR) == 0)) {
4359                         /* Any error interrupts including unit_check,
4360                          * initiate IOA reset.In case of unit check indicate
4361                          * to reset_sequence that IOA unit checked and prepare
4362                          * for a dump during reset sequence
4363                          */
4364                         if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4365                                 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4366                                         pinstance->ioa_unit_check = 1;
4367
4368                                 pmcraid_err("ISR: error interrupts: %x \
4369                                         initiating reset\n", intrs_val);
4370                                 spin_lock_irqsave(pinstance->host->host_lock,
4371                                         lock_flags);
4372                                 pmcraid_initiate_reset(pinstance);
4373                                 spin_unlock_irqrestore(
4374                                         pinstance->host->host_lock,
4375                                         lock_flags);
4376                         }
4377                         /* If interrupt was as part of the ioa initialization,
4378                          * clear it. Delete the timer and wakeup the
4379                          * reset engine to proceed with reset sequence
4380                          */
4381                         if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4382                                 pmcraid_clr_trans_op(pinstance);
4383
4384                         /* Clear the interrupt register by writing
4385                          * to host to ioa doorbell. Once done
4386                          * FW will clear the interrupt.
4387                          */
4388                         iowrite32(DOORBELL_INTR_MSIX_CLR,
4389                                 pinstance->int_regs.host_ioa_interrupt_reg);
4390                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4391
4392
4393                 }
4394         }
4395
4396         tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4397
4398         return IRQ_HANDLED;
4399 }
4400
4401 /**
4402  * pmcraid_isr  - implements legacy interrupt handling routine
4403  *
4404  * @irq: interrupt vector number
4405  * @dev_id: pointer hrrq_vector
4406  *
4407  * Return Value
4408  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4409  */
4410 static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4411 {
4412         struct pmcraid_isr_param *hrrq_vector;
4413         struct pmcraid_instance *pinstance;
4414         u32 intrs;
4415         unsigned long lock_flags;
4416         int hrrq_id = 0;
4417
4418         /* In case of legacy interrupt mode where interrupts are shared across
4419          * isrs, it may be possible that the current interrupt is not from IOA
4420          */
4421         if (!dev_id) {
4422                 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4423                 return IRQ_NONE;
4424         }
4425         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4426         pinstance = hrrq_vector->drv_inst;
4427
4428         intrs = pmcraid_read_interrupts(pinstance);
4429
4430         if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4431                 return IRQ_NONE;
4432
4433         /* Any error interrupts including unit_check, initiate IOA reset.
4434          * In case of unit check indicate to reset_sequence that IOA unit
4435          * checked and prepare for a dump during reset sequence
4436          */
4437         if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4438
4439                 if (intrs & INTRS_IOA_UNIT_CHECK)
4440                         pinstance->ioa_unit_check = 1;
4441
4442                 iowrite32(intrs,
4443                           pinstance->int_regs.ioa_host_interrupt_clr_reg);
4444                 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4445                             intrs);
4446                 intrs = ioread32(
4447                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4448                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4449                 pmcraid_initiate_reset(pinstance);
4450                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4451         } else {
4452                 /* If interrupt was as part of the ioa initialization,
4453                  * clear. Delete the timer and wakeup the
4454                  * reset engine to proceed with reset sequence
4455                  */
4456                 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4457                         pmcraid_clr_trans_op(pinstance);
4458                 } else {
4459                         iowrite32(intrs,
4460                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4461                         ioread32(
4462                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4463
4464                         tasklet_schedule(
4465                                         &(pinstance->isr_tasklet[hrrq_id]));
4466                 }
4467         }
4468
4469         return IRQ_HANDLED;
4470 }
4471
4472
4473 /**
4474  * pmcraid_worker_function -  worker thread function
4475  *
4476  * @workp: pointer to struct work queue
4477  *
4478  * Return Value
4479  *       None
4480  */
4481
4482 static void pmcraid_worker_function(struct work_struct *workp)
4483 {
4484         struct pmcraid_instance *pinstance;
4485         struct pmcraid_resource_entry *res;
4486         struct pmcraid_resource_entry *temp;
4487         struct scsi_device *sdev;
4488         unsigned long lock_flags;
4489         unsigned long host_lock_flags;
4490         u16 fw_version;
4491         u8 bus, target, lun;
4492
4493         pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4494         /* add resources only after host is added into system */
4495         if (!atomic_read(&pinstance->expose_resources))
4496                 return;
4497
4498         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4499
4500         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4501         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4502
4503                 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4504                         sdev = res->scsi_dev;
4505
4506                         /* host_lock must be held before calling
4507                          * scsi_device_get
4508                          */
4509                         spin_lock_irqsave(pinstance->host->host_lock,
4510                                           host_lock_flags);
4511                         if (!scsi_device_get(sdev)) {
4512                                 spin_unlock_irqrestore(
4513                                                 pinstance->host->host_lock,
4514                                                 host_lock_flags);
4515                                 pmcraid_info("deleting %x from midlayer\n",
4516                                              res->cfg_entry.resource_address);
4517                                 list_move_tail(&res->queue,
4518                                                 &pinstance->free_res_q);
4519                                 spin_unlock_irqrestore(
4520                                         &pinstance->resource_lock,
4521                                         lock_flags);
4522                                 scsi_remove_device(sdev);
4523                                 scsi_device_put(sdev);
4524                                 spin_lock_irqsave(&pinstance->resource_lock,
4525                                                    lock_flags);
4526                                 res->change_detected = 0;
4527                         } else {
4528                                 spin_unlock_irqrestore(
4529                                                 pinstance->host->host_lock,
4530                                                 host_lock_flags);
4531                         }
4532                 }
4533         }
4534
4535         list_for_each_entry(res, &pinstance->used_res_q, queue) {
4536
4537                 if (res->change_detected == RES_CHANGE_ADD) {
4538
4539                         if (!pmcraid_expose_resource(fw_version,
4540                                                      &res->cfg_entry))
4541                                 continue;
4542
4543                         if (RES_IS_VSET(res->cfg_entry)) {
4544                                 bus = PMCRAID_VSET_BUS_ID;
4545                                 if (fw_version <= PMCRAID_FW_VERSION_1)
4546                                         target = res->cfg_entry.unique_flags1;
4547                                 else
4548                                         target = res->cfg_entry.array_id & 0xFF;
4549                                 lun = PMCRAID_VSET_LUN_ID;
4550                         } else {
4551                                 bus = PMCRAID_PHYS_BUS_ID;
4552                                 target =
4553                                      RES_TARGET(
4554                                         res->cfg_entry.resource_address);
4555                                 lun = RES_LUN(res->cfg_entry.resource_address);
4556                         }
4557
4558                         res->change_detected = 0;
4559                         spin_unlock_irqrestore(&pinstance->resource_lock,
4560                                                 lock_flags);
4561                         scsi_add_device(pinstance->host, bus, target, lun);
4562                         spin_lock_irqsave(&pinstance->resource_lock,
4563                                            lock_flags);
4564                 }
4565         }
4566
4567         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4568 }
4569
4570 /**
4571  * pmcraid_tasklet_function - Tasklet function
4572  *
4573  * @instance: pointer to msix param structure
4574  *
4575  * Return Value
4576  *      None
4577  */
4578 static void pmcraid_tasklet_function(unsigned long instance)
4579 {
4580         struct pmcraid_isr_param *hrrq_vector;
4581         struct pmcraid_instance *pinstance;
4582         unsigned long hrrq_lock_flags;
4583         unsigned long pending_lock_flags;
4584         unsigned long host_lock_flags;
4585         spinlock_t *lockp; /* hrrq buffer lock */
4586         int id;
4587         __le32 resp;
4588
4589         hrrq_vector = (struct pmcraid_isr_param *)instance;
4590         pinstance = hrrq_vector->drv_inst;
4591         id = hrrq_vector->hrrq_id;
4592         lockp = &(pinstance->hrrq_lock[id]);
4593
4594         /* loop through each of the commands responded by IOA. Each HRRQ buf is
4595          * protected by its own lock. Traversals must be done within this lock
4596          * as there may be multiple tasklets running on multiple CPUs. Note
4597          * that the lock is held just for picking up the response handle and
4598          * manipulating hrrq_curr/toggle_bit values.
4599          */
4600         spin_lock_irqsave(lockp, hrrq_lock_flags);
4601
4602         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4603
4604         while ((resp & HRRQ_TOGGLE_BIT) ==
4605                 pinstance->host_toggle_bit[id]) {
4606
4607                 int cmd_index = resp >> 2;
4608                 struct pmcraid_cmd *cmd = NULL;
4609
4610                 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4611                         pinstance->hrrq_curr[id]++;
4612                 } else {
4613                         pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4614                         pinstance->host_toggle_bit[id] ^= 1u;
4615                 }
4616
4617                 if (cmd_index >= PMCRAID_MAX_CMD) {
4618                         /* In case of invalid response handle, log message */
4619                         pmcraid_err("Invalid response handle %d\n", cmd_index);
4620                         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4621                         continue;
4622                 }
4623
4624                 cmd = pinstance->cmd_list[cmd_index];
4625                 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4626
4627                 spin_lock_irqsave(&pinstance->pending_pool_lock,
4628                                    pending_lock_flags);
4629                 list_del(&cmd->free_list);
4630                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4631                                         pending_lock_flags);
4632                 del_timer(&cmd->timer);
4633                 atomic_dec(&pinstance->outstanding_cmds);
4634
4635                 if (cmd->cmd_done == pmcraid_ioa_reset) {
4636                         spin_lock_irqsave(pinstance->host->host_lock,
4637                                           host_lock_flags);
4638                         cmd->cmd_done(cmd);
4639                         spin_unlock_irqrestore(pinstance->host->host_lock,
4640                                                host_lock_flags);
4641                 } else if (cmd->cmd_done != NULL) {
4642                         cmd->cmd_done(cmd);
4643                 }
4644                 /* loop over until we are done with all responses */
4645                 spin_lock_irqsave(lockp, hrrq_lock_flags);
4646                 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4647         }
4648
4649         spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4650 }
4651
4652 /**
4653  * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4654  * @pinstance: pointer to adapter instance structure
4655  *
4656  * This routine un-registers registered interrupt handler and
4657  * also frees irqs/vectors.
4658  *
4659  * Retun Value
4660  *      None
4661  */
4662 static
4663 void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4664 {
4665         int i;
4666
4667         for (i = 0; i < pinstance->num_hrrq; i++)
4668                 free_irq(pinstance->hrrq_vector[i].vector,
4669                          &(pinstance->hrrq_vector[i]));
4670
4671         if (pinstance->interrupt_mode) {
4672                 pci_disable_msix(pinstance->pdev);
4673                 pinstance->interrupt_mode = 0;
4674         }
4675 }
4676
4677 /**
4678  * pmcraid_register_interrupt_handler - registers interrupt handler
4679  * @pinstance: pointer to per-adapter instance structure
4680  *
4681  * Return Value
4682  *      0 on success, non-zero error code otherwise.
4683  */
4684 static int
4685 pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4686 {
4687         int rc;
4688         struct pci_dev *pdev = pinstance->pdev;
4689
4690         if ((pmcraid_enable_msix) &&
4691                 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4692                 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4693                 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4694                 int i;
4695                 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4696                         entries[i].entry = i;
4697
4698                 rc = pci_enable_msix(pdev, entries, num_hrrq);
4699                 if (rc < 0)
4700                         goto pmcraid_isr_legacy;
4701
4702                 /* Check how many MSIX vectors are allocated and register
4703                  * msi-x handlers for each of them giving appropriate buffer
4704                  */
4705                 if (rc > 0) {
4706                         num_hrrq = rc;
4707                         if (pci_enable_msix(pdev, entries, num_hrrq))
4708                                 goto pmcraid_isr_legacy;
4709                 }
4710
4711                 for (i = 0; i < num_hrrq; i++) {
4712                         pinstance->hrrq_vector[i].hrrq_id = i;
4713                         pinstance->hrrq_vector[i].drv_inst = pinstance;
4714                         pinstance->hrrq_vector[i].vector = entries[i].vector;
4715                         rc = request_irq(pinstance->hrrq_vector[i].vector,
4716                                         pmcraid_isr_msix, 0,
4717                                         PMCRAID_DRIVER_NAME,
4718                                         &(pinstance->hrrq_vector[i]));
4719
4720                         if (rc) {
4721                                 int j;
4722                                 for (j = 0; j < i; j++)
4723                                         free_irq(entries[j].vector,
4724                                                  &(pinstance->hrrq_vector[j]));
4725                                 pci_disable_msix(pdev);
4726                                 goto pmcraid_isr_legacy;
4727                         }
4728                 }
4729
4730                 pinstance->num_hrrq = num_hrrq;
4731                 pinstance->interrupt_mode = 1;
4732                 iowrite32(DOORBELL_INTR_MODE_MSIX,
4733                           pinstance->int_regs.host_ioa_interrupt_reg);
4734                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4735                 goto pmcraid_isr_out;
4736         }
4737
4738 pmcraid_isr_legacy:
4739         /* If MSI-X registration failed fallback to legacy mode, where
4740          * only one hrrq entry will be used
4741          */
4742         pinstance->hrrq_vector[0].hrrq_id = 0;
4743         pinstance->hrrq_vector[0].drv_inst = pinstance;
4744         pinstance->hrrq_vector[0].vector = pdev->irq;
4745         pinstance->num_hrrq = 1;
4746         rc = 0;
4747
4748         rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4749                          PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4750 pmcraid_isr_out:
4751         return rc;
4752 }
4753
4754 /**
4755  * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4756  * @pinstance: per adapter instance structure pointer
4757  * @max_index: number of buffer blocks to release
4758  *
4759  * Return Value
4760  *  None
4761  */
4762 static void
4763 pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4764 {
4765         int i;
4766         for (i = 0; i < max_index; i++) {
4767                 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4768                 pinstance->cmd_list[i] = NULL;
4769         }
4770         kmem_cache_destroy(pinstance->cmd_cachep);
4771         pinstance->cmd_cachep = NULL;
4772 }
4773
4774 /**
4775  * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4776  * @pinstance: pointer to per adapter instance structure
4777  * @max_index: number of buffers (from 0 onwards) to release
4778  *
4779  * This function assumes that the command blocks for which control blocks are
4780  * linked are not released.
4781  *
4782  * Return Value
4783  *       None
4784  */
4785 static void
4786 pmcraid_release_control_blocks(
4787         struct pmcraid_instance *pinstance,
4788         int max_index
4789 )
4790 {
4791         int i;
4792
4793         if (pinstance->control_pool == NULL)
4794                 return;
4795
4796         for (i = 0; i < max_index; i++) {
4797                 pci_pool_free(pinstance->control_pool,
4798                               pinstance->cmd_list[i]->ioa_cb,
4799                               pinstance->cmd_list[i]->ioa_cb_bus_addr);
4800                 pinstance->cmd_list[i]->ioa_cb = NULL;
4801                 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4802         }
4803         pci_pool_destroy(pinstance->control_pool);
4804         pinstance->control_pool = NULL;
4805 }
4806
4807 /**
4808  * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4809  * @pinstance - pointer to per adapter instance structure
4810  *
4811  * Allocates memory for command blocks using kernel slab allocator.
4812  *
4813  * Return Value
4814  *      0 in case of success; -ENOMEM in case of failure
4815  */
4816 static int __devinit
4817 pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4818 {
4819         int i;
4820
4821         sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4822                 pinstance->host->unique_id);
4823
4824
4825         pinstance->cmd_cachep = kmem_cache_create(
4826                                         pinstance->cmd_pool_name,
4827                                         sizeof(struct pmcraid_cmd), 0,
4828                                         SLAB_HWCACHE_ALIGN, NULL);
4829         if (!pinstance->cmd_cachep)
4830                 return -ENOMEM;
4831
4832         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4833                 pinstance->cmd_list[i] =
4834                         kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4835                 if (!pinstance->cmd_list[i]) {
4836                         pmcraid_release_cmd_blocks(pinstance, i);
4837                         return -ENOMEM;
4838                 }
4839         }
4840         return 0;
4841 }
4842
4843 /**
4844  * pmcraid_allocate_control_blocks - allocates memory control blocks
4845  * @pinstance : pointer to per adapter instance structure
4846  *
4847  * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4848  * and IOASAs. This is called after command blocks are already allocated.
4849  *
4850  * Return Value
4851  *  0 in case it can allocate all control blocks, otherwise -ENOMEM
4852  */
4853 static int __devinit
4854 pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4855 {
4856         int i;
4857
4858         sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4859                 pinstance->host->unique_id);
4860
4861         pinstance->control_pool =
4862                 pci_pool_create(pinstance->ctl_pool_name,
4863                                 pinstance->pdev,
4864                                 sizeof(struct pmcraid_control_block),
4865                                 PMCRAID_IOARCB_ALIGNMENT, 0);
4866
4867         if (!pinstance->control_pool)
4868                 return -ENOMEM;
4869
4870         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4871                 pinstance->cmd_list[i]->ioa_cb =
4872                         pci_pool_alloc(
4873                                 pinstance->control_pool,
4874                                 GFP_KERNEL,
4875                                 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4876
4877                 if (!pinstance->cmd_list[i]->ioa_cb) {
4878                         pmcraid_release_control_blocks(pinstance, i);
4879                         return -ENOMEM;
4880                 }
4881                 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4882                         sizeof(struct pmcraid_control_block));
4883         }
4884         return 0;
4885 }
4886
4887 /**
4888  * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4889  * @pinstance: pointer to per adapter instance structure
4890  * @maxindex: size of hrrq buffer pointer array
4891  *
4892  * Return Value
4893  *      None
4894  */
4895 static void
4896 pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4897 {
4898         int i;
4899         for (i = 0; i < maxindex; i++) {
4900
4901                 pci_free_consistent(pinstance->pdev,
4902                                     HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4903                                     pinstance->hrrq_start[i],
4904                                     pinstance->hrrq_start_bus_addr[i]);
4905
4906                 /* reset pointers and toggle bit to zeros */
4907                 pinstance->hrrq_start[i] = NULL;
4908                 pinstance->hrrq_start_bus_addr[i] = 0;
4909                 pinstance->host_toggle_bit[i] = 0;
4910         }
4911 }
4912
4913 /**
4914  * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4915  * @pinstance: pointer to per adapter instance structure
4916  *
4917  * Return value
4918  *      0 hrrq buffers are allocated, -ENOMEM otherwise.
4919  */
4920 static int __devinit
4921 pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4922 {
4923         int i, buffer_size;
4924
4925         buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4926
4927         for (i = 0; i < pinstance->num_hrrq; i++) {
4928                 pinstance->hrrq_start[i] =
4929                         pci_alloc_consistent(
4930                                         pinstance->pdev,
4931                                         buffer_size,
4932                                         &(pinstance->hrrq_start_bus_addr[i]));
4933
4934                 if (pinstance->hrrq_start[i] == 0) {
4935                         pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4936                                     i);
4937                         pmcraid_release_host_rrqs(pinstance, i);
4938                         return -ENOMEM;
4939                 }
4940
4941                 memset(pinstance->hrrq_start[i], 0, buffer_size);
4942                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4943                 pinstance->hrrq_end[i] =
4944                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4945                 pinstance->host_toggle_bit[i] = 1;
4946                 spin_lock_init(&pinstance->hrrq_lock[i]);
4947         }
4948         return 0;
4949 }
4950
4951 /**
4952  * pmcraid_release_hcams - release HCAM buffers
4953  *
4954  * @pinstance: pointer to per adapter instance structure
4955  *
4956  * Return value
4957  *  none
4958  */
4959 static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4960 {
4961         if (pinstance->ccn.msg != NULL) {
4962                 pci_free_consistent(pinstance->pdev,
4963                                     PMCRAID_AEN_HDR_SIZE +
4964                                     sizeof(struct pmcraid_hcam_ccn_ext),
4965                                     pinstance->ccn.msg,
4966                                     pinstance->ccn.baddr);
4967
4968                 pinstance->ccn.msg = NULL;
4969                 pinstance->ccn.hcam = NULL;
4970                 pinstance->ccn.baddr = 0;
4971         }
4972
4973         if (pinstance->ldn.msg != NULL) {
4974                 pci_free_consistent(pinstance->pdev,
4975                                     PMCRAID_AEN_HDR_SIZE +
4976                                     sizeof(struct pmcraid_hcam_ldn),
4977                                     pinstance->ldn.msg,
4978                                     pinstance->ldn.baddr);
4979
4980                 pinstance->ldn.msg = NULL;
4981                 pinstance->ldn.hcam = NULL;
4982                 pinstance->ldn.baddr = 0;
4983         }
4984 }
4985
4986 /**
4987  * pmcraid_allocate_hcams - allocates HCAM buffers
4988  * @pinstance : pointer to per adapter instance structure
4989  *
4990  * Return Value:
4991  *   0 in case of successful allocation, non-zero otherwise
4992  */
4993 static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4994 {
4995         pinstance->ccn.msg = pci_alloc_consistent(
4996                                         pinstance->pdev,
4997                                         PMCRAID_AEN_HDR_SIZE +
4998                                         sizeof(struct pmcraid_hcam_ccn_ext),
4999                                         &(pinstance->ccn.baddr));
5000
5001         pinstance->ldn.msg = pci_alloc_consistent(
5002                                         pinstance->pdev,
5003                                         PMCRAID_AEN_HDR_SIZE +
5004                                         sizeof(struct pmcraid_hcam_ldn),
5005                                         &(pinstance->ldn.baddr));
5006
5007         if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
5008                 pmcraid_release_hcams(pinstance);
5009         } else {
5010                 pinstance->ccn.hcam =
5011                         (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
5012                 pinstance->ldn.hcam =
5013                         (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
5014
5015                 atomic_set(&pinstance->ccn.ignore, 0);
5016                 atomic_set(&pinstance->ldn.ignore, 0);
5017         }
5018
5019         return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
5020 }
5021
5022 /**
5023  * pmcraid_release_config_buffers - release config.table buffers
5024  * @pinstance: pointer to per adapter instance structure
5025  *
5026  * Return Value
5027  *       none
5028  */
5029 static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
5030 {
5031         if (pinstance->cfg_table != NULL &&
5032             pinstance->cfg_table_bus_addr != 0) {
5033                 pci_free_consistent(pinstance->pdev,
5034                                     sizeof(struct pmcraid_config_table),
5035                                     pinstance->cfg_table,
5036                                     pinstance->cfg_table_bus_addr);
5037                 pinstance->cfg_table = NULL;
5038                 pinstance->cfg_table_bus_addr = 0;
5039         }
5040
5041         if (pinstance->res_entries != NULL) {
5042                 int i;
5043
5044                 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5045                         list_del(&pinstance->res_entries[i].queue);
5046                 kfree(pinstance->res_entries);
5047                 pinstance->res_entries = NULL;
5048         }
5049
5050         pmcraid_release_hcams(pinstance);
5051 }
5052
5053 /**
5054  * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
5055  * @pinstance : pointer to per adapter instance structure
5056  *
5057  * Return Value
5058  *      0 for successful allocation, -ENOMEM for any failure
5059  */
5060 static int __devinit
5061 pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
5062 {
5063         int i;
5064
5065         pinstance->res_entries =
5066                         kzalloc(sizeof(struct pmcraid_resource_entry) *
5067                                 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
5068
5069         if (NULL == pinstance->res_entries) {
5070                 pmcraid_err("failed to allocate memory for resource table\n");
5071                 return -ENOMEM;
5072         }
5073
5074         for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5075                 list_add_tail(&pinstance->res_entries[i].queue,
5076                               &pinstance->free_res_q);
5077
5078         pinstance->cfg_table =
5079                 pci_alloc_consistent(pinstance->pdev,
5080                                      sizeof(struct pmcraid_config_table),
5081                                      &pinstance->cfg_table_bus_addr);
5082
5083         if (NULL == pinstance->cfg_table) {
5084                 pmcraid_err("couldn't alloc DMA memory for config table\n");
5085                 pmcraid_release_config_buffers(pinstance);
5086                 return -ENOMEM;
5087         }
5088
5089         if (pmcraid_allocate_hcams(pinstance)) {
5090                 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5091                 pmcraid_release_config_buffers(pinstance);
5092                 return -ENOMEM;
5093         }
5094
5095         return 0;
5096 }
5097
5098 /**
5099  * pmcraid_init_tasklets - registers tasklets for response handling
5100  *
5101  * @pinstance: pointer adapter instance structure
5102  *
5103  * Return value
5104  *      none
5105  */
5106 static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5107 {
5108         int i;
5109         for (i = 0; i < pinstance->num_hrrq; i++)
5110                 tasklet_init(&pinstance->isr_tasklet[i],
5111                              pmcraid_tasklet_function,
5112                              (unsigned long)&pinstance->hrrq_vector[i]);
5113 }
5114
5115 /**
5116  * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5117  *
5118  * @pinstance: pointer to adapter instance structure
5119  *
5120  * Return value
5121  *      none
5122  */
5123 static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5124 {
5125         int i;
5126         for (i = 0; i < pinstance->num_hrrq; i++)
5127                 tasklet_kill(&pinstance->isr_tasklet[i]);
5128 }
5129
5130 /**
5131  * pmcraid_release_buffers - release per-adapter buffers allocated
5132  *
5133  * @pinstance: pointer to adapter soft state
5134  *
5135  * Return Value
5136  *      none
5137  */
5138 static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5139 {
5140         pmcraid_release_config_buffers(pinstance);
5141         pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5142         pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5143         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5144
5145         if (pinstance->inq_data != NULL) {
5146                 pci_free_consistent(pinstance->pdev,
5147                                     sizeof(struct pmcraid_inquiry_data),
5148                                     pinstance->inq_data,
5149                                     pinstance->inq_data_baddr);
5150
5151                 pinstance->inq_data = NULL;
5152                 pinstance->inq_data_baddr = 0;
5153         }
5154
5155         if (pinstance->timestamp_data != NULL) {
5156                 pci_free_consistent(pinstance->pdev,
5157                                     sizeof(struct pmcraid_timestamp_data),
5158                                     pinstance->timestamp_data,
5159                                     pinstance->timestamp_data_baddr);
5160
5161                 pinstance->timestamp_data = NULL;
5162                 pinstance->timestamp_data_baddr = 0;
5163         }
5164 }
5165
5166 /**
5167  * pmcraid_init_buffers - allocates memory and initializes various structures
5168  * @pinstance: pointer to per adapter instance structure
5169  *
5170  * This routine pre-allocates memory based on the type of block as below:
5171  * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5172  * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
5173  * config-table entries      : DMAable memory using pci_alloc_consistent
5174  * HostRRQs                  : DMAable memory, using pci_alloc_consistent
5175  *
5176  * Return Value
5177  *       0 in case all of the blocks are allocated, -ENOMEM otherwise.
5178  */
5179 static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5180 {
5181         int i;
5182
5183         if (pmcraid_allocate_host_rrqs(pinstance)) {
5184                 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5185                              pinstance->num_hrrq);
5186                 return -ENOMEM;
5187         }
5188
5189         if (pmcraid_allocate_config_buffers(pinstance)) {
5190                 pmcraid_err("couldn't allocate memory for config buffers\n");
5191                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5192                 return -ENOMEM;
5193         }
5194
5195         if (pmcraid_allocate_cmd_blocks(pinstance)) {
5196                 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5197                 pmcraid_release_config_buffers(pinstance);
5198                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5199                 return -ENOMEM;
5200         }
5201
5202         if (pmcraid_allocate_control_blocks(pinstance)) {
5203                 pmcraid_err("couldn't allocate memory control blocks\n");
5204                 pmcraid_release_config_buffers(pinstance);
5205                 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5206                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5207                 return -ENOMEM;
5208         }
5209
5210         /* allocate DMAable memory for page D0 INQUIRY buffer */
5211         pinstance->inq_data = pci_alloc_consistent(
5212                                         pinstance->pdev,
5213                                         sizeof(struct pmcraid_inquiry_data),
5214                                         &pinstance->inq_data_baddr);
5215
5216         if (pinstance->inq_data == NULL) {
5217                 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5218                 pmcraid_release_buffers(pinstance);
5219                 return -ENOMEM;
5220         }
5221
5222         /* allocate DMAable memory for set timestamp data buffer */
5223         pinstance->timestamp_data = pci_alloc_consistent(
5224                                         pinstance->pdev,
5225                                         sizeof(struct pmcraid_timestamp_data),
5226                                         &pinstance->timestamp_data_baddr);
5227
5228         if (pinstance->timestamp_data == NULL) {
5229                 pmcraid_err("couldn't allocate DMA memory for \
5230                                 set time_stamp \n");
5231                 pmcraid_release_buffers(pinstance);
5232                 return -ENOMEM;
5233         }
5234
5235
5236         /* Initialize all the command blocks and add them to free pool. No
5237          * need to lock (free_pool_lock) as this is done in initialization
5238          * itself
5239          */
5240         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5241                 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5242                 pmcraid_init_cmdblk(cmdp, i);
5243                 cmdp->drv_inst = pinstance;
5244                 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5245         }
5246
5247         return 0;
5248 }
5249
5250 /**
5251  * pmcraid_reinit_buffers - resets various buffer pointers
5252  * @pinstance: pointer to adapter instance
5253  * Return value
5254  *      none
5255  */
5256 static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5257 {
5258         int i;
5259         int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5260
5261         for (i = 0; i < pinstance->num_hrrq; i++) {
5262                 memset(pinstance->hrrq_start[i], 0, buffer_size);
5263                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5264                 pinstance->hrrq_end[i] =
5265                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5266                 pinstance->host_toggle_bit[i] = 1;
5267         }
5268 }
5269
5270 /**
5271  * pmcraid_init_instance - initialize per instance data structure
5272  * @pdev: pointer to pci device structure
5273  * @host: pointer to Scsi_Host structure
5274  * @mapped_pci_addr: memory mapped IOA configuration registers
5275  *
5276  * Return Value
5277  *       0 on success, non-zero in case of any failure
5278  */
5279 static int __devinit pmcraid_init_instance(
5280         struct pci_dev *pdev,
5281         struct Scsi_Host *host,
5282         void __iomem *mapped_pci_addr
5283 )
5284 {
5285         struct pmcraid_instance *pinstance =
5286                 (struct pmcraid_instance *)host->hostdata;
5287
5288         pinstance->host = host;
5289         pinstance->pdev = pdev;
5290
5291         /* Initialize register addresses */
5292         pinstance->mapped_dma_addr = mapped_pci_addr;
5293
5294         /* Initialize chip-specific details */
5295         {
5296                 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5297                 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5298
5299                 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5300
5301                 pint_regs->ioa_host_interrupt_reg =
5302                         mapped_pci_addr + chip_cfg->ioa_host_intr;
5303                 pint_regs->ioa_host_interrupt_clr_reg =
5304                         mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5305                 pint_regs->ioa_host_msix_interrupt_reg =
5306                         mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5307                 pint_regs->host_ioa_interrupt_reg =
5308                         mapped_pci_addr + chip_cfg->host_ioa_intr;
5309                 pint_regs->host_ioa_interrupt_clr_reg =
5310                         mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5311
5312                 /* Current version of firmware exposes interrupt mask set
5313                  * and mask clr registers through memory mapped bar0.
5314                  */
5315                 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5316                 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5317                 pint_regs->ioa_host_interrupt_mask_reg =
5318                         mapped_pci_addr + chip_cfg->ioa_host_mask;
5319                 pint_regs->ioa_host_interrupt_mask_clr_reg =
5320                         mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5321                 pint_regs->global_interrupt_mask_reg =
5322                         mapped_pci_addr + chip_cfg->global_intr_mask;
5323         };
5324
5325         pinstance->ioa_reset_attempts = 0;
5326         init_waitqueue_head(&pinstance->reset_wait_q);
5327
5328         atomic_set(&pinstance->outstanding_cmds, 0);
5329         atomic_set(&pinstance->last_message_id, 0);
5330         atomic_set(&pinstance->expose_resources, 0);
5331
5332         INIT_LIST_HEAD(&pinstance->free_res_q);
5333         INIT_LIST_HEAD(&pinstance->used_res_q);
5334         INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5335         INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5336
5337         spin_lock_init(&pinstance->free_pool_lock);
5338         spin_lock_init(&pinstance->pending_pool_lock);
5339         spin_lock_init(&pinstance->resource_lock);
5340         mutex_init(&pinstance->aen_queue_lock);
5341
5342         /* Work-queue (Shared) for deferred processing error handling */
5343         INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5344
5345         /* Initialize the default log_level */
5346         pinstance->current_log_level = pmcraid_log_level;
5347
5348         /* Setup variables required for reset engine */
5349         pinstance->ioa_state = IOA_STATE_UNKNOWN;
5350         pinstance->reset_cmd = NULL;
5351         return 0;
5352 }
5353
5354 /**
5355  * pmcraid_shutdown - shutdown adapter controller.
5356  * @pdev: pci device struct
5357  *
5358  * Issues an adapter shutdown to the card waits for its completion
5359  *
5360  * Return value
5361  *        none
5362  */
5363 static void pmcraid_shutdown(struct pci_dev *pdev)
5364 {
5365         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5366         pmcraid_reset_bringdown(pinstance);
5367 }
5368
5369
5370 /**
5371  * pmcraid_get_minor - returns unused minor number from minor number bitmap
5372  */
5373 static unsigned short pmcraid_get_minor(void)
5374 {
5375         int minor;
5376
5377         minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5378         __set_bit(minor, pmcraid_minor);
5379         return minor;
5380 }
5381
5382 /**
5383  * pmcraid_release_minor - releases given minor back to minor number bitmap
5384  */
5385 static void pmcraid_release_minor(unsigned short minor)
5386 {
5387         __clear_bit(minor, pmcraid_minor);
5388 }
5389
5390 /**
5391  * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5392  *
5393  * @pinstance: pointer to adapter instance for which to register device
5394  *
5395  * Return value
5396  *      0 in case of success, otherwise non-zero
5397  */
5398 static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5399 {
5400         int minor;
5401         int error;
5402
5403         minor = pmcraid_get_minor();
5404         cdev_init(&pinstance->cdev, &pmcraid_fops);
5405         pinstance->cdev.owner = THIS_MODULE;
5406
5407         error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5408
5409         if (error)
5410                 pmcraid_release_minor(minor);
5411         else
5412                 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5413                               NULL, "%s%u", PMCRAID_DEVFILE, minor);
5414         return error;
5415 }
5416
5417 /**
5418  * pmcraid_release_chrdev - unregisters per-adapter management interface
5419  *
5420  * @pinstance: pointer to adapter instance structure
5421  *
5422  * Return value
5423  *  none
5424  */
5425 static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5426 {
5427         pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5428         device_destroy(pmcraid_class,
5429                        MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5430         cdev_del(&pinstance->cdev);
5431 }
5432
5433 /**
5434  * pmcraid_remove - IOA hot plug remove entry point
5435  * @pdev: pci device struct
5436  *
5437  * Return value
5438  *        none
5439  */
5440 static void __devexit pmcraid_remove(struct pci_dev *pdev)
5441 {
5442         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5443
5444         /* remove the management interface (/dev file) for this device */
5445         pmcraid_release_chrdev(pinstance);
5446
5447         /* remove host template from scsi midlayer */
5448         scsi_remove_host(pinstance->host);
5449
5450         /* block requests from mid-layer */
5451         scsi_block_requests(pinstance->host);
5452
5453         /* initiate shutdown adapter */
5454         pmcraid_shutdown(pdev);
5455
5456         pmcraid_disable_interrupts(pinstance, ~0);
5457         flush_scheduled_work();
5458
5459         pmcraid_kill_tasklets(pinstance);
5460         pmcraid_unregister_interrupt_handler(pinstance);
5461         pmcraid_release_buffers(pinstance);
5462         iounmap(pinstance->mapped_dma_addr);
5463         pci_release_regions(pdev);
5464         scsi_host_put(pinstance->host);
5465         pci_disable_device(pdev);
5466
5467         return;
5468 }
5469
5470 #ifdef CONFIG_PM
5471 /**
5472  * pmcraid_suspend - driver suspend entry point for power management
5473  * @pdev:   PCI device structure
5474  * @state:  PCI power state to suspend routine
5475  *
5476  * Return Value - 0 always
5477  */
5478 static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5479 {
5480         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5481
5482         pmcraid_shutdown(pdev);
5483         pmcraid_disable_interrupts(pinstance, ~0);
5484         pmcraid_kill_tasklets(pinstance);
5485         pci_set_drvdata(pinstance->pdev, pinstance);
5486         pmcraid_unregister_interrupt_handler(pinstance);
5487         pci_save_state(pdev);
5488         pci_disable_device(pdev);
5489         pci_set_power_state(pdev, pci_choose_state(pdev, state));
5490
5491         return 0;
5492 }
5493
5494 /**
5495  * pmcraid_resume - driver resume entry point PCI power management
5496  * @pdev: PCI device structure
5497  *
5498  * Return Value - 0 in case of success. Error code in case of any failure
5499  */
5500 static int pmcraid_resume(struct pci_dev *pdev)
5501 {
5502         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5503         struct Scsi_Host *host = pinstance->host;
5504         int rc;
5505
5506         pci_set_power_state(pdev, PCI_D0);
5507         pci_enable_wake(pdev, PCI_D0, 0);
5508         pci_restore_state(pdev);
5509
5510         rc = pci_enable_device(pdev);
5511
5512         if (rc) {
5513                 dev_err(&pdev->dev, "resume: Enable device failed\n");
5514                 return rc;
5515         }
5516
5517         pci_set_master(pdev);
5518
5519         if ((sizeof(dma_addr_t) == 4) ||
5520              pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5521                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5522
5523         if (rc == 0)
5524                 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5525
5526         if (rc != 0) {
5527                 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5528                 goto disable_device;
5529         }
5530
5531         pmcraid_disable_interrupts(pinstance, ~0);
5532         atomic_set(&pinstance->outstanding_cmds, 0);
5533         rc = pmcraid_register_interrupt_handler(pinstance);
5534
5535         if (rc) {
5536                 dev_err(&pdev->dev,
5537                         "resume: couldn't register interrupt handlers\n");
5538                 rc = -ENODEV;
5539                 goto release_host;
5540         }
5541
5542         pmcraid_init_tasklets(pinstance);
5543         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5544
5545         /* Start with hard reset sequence which brings up IOA to operational
5546          * state as well as completes the reset sequence.
5547          */
5548         pinstance->ioa_hard_reset = 1;
5549
5550         /* Start IOA firmware initialization and bring card to Operational
5551          * state.
5552          */
5553         if (pmcraid_reset_bringup(pinstance)) {
5554                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5555                 rc = -ENODEV;
5556                 goto release_tasklets;
5557         }
5558
5559         return 0;
5560
5561 release_tasklets:
5562         pmcraid_disable_interrupts(pinstance, ~0);
5563         pmcraid_kill_tasklets(pinstance);
5564         pmcraid_unregister_interrupt_handler(pinstance);
5565
5566 release_host:
5567         scsi_host_put(host);
5568
5569 disable_device:
5570         pci_disable_device(pdev);
5571
5572         return rc;
5573 }
5574
5575 #else
5576
5577 #define pmcraid_suspend NULL
5578 #define pmcraid_resume  NULL
5579
5580 #endif /* CONFIG_PM */
5581
5582 /**
5583  * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5584  *                              completion of the ioa reset
5585  * @cmd: pointer to reset command block
5586  */
5587 static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5588 {
5589         struct pmcraid_instance *pinstance = cmd->drv_inst;
5590         unsigned long flags;
5591
5592         spin_lock_irqsave(pinstance->host->host_lock, flags);
5593         pmcraid_ioa_reset(cmd);
5594         spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5595         scsi_unblock_requests(pinstance->host);
5596         schedule_work(&pinstance->worker_q);
5597 }
5598
5599 /**
5600  * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5601  *
5602  * @cmd: pointer to pmcraid_cmd structure
5603  *
5604  * Return Value
5605  *  0 for success or non-zero for failure cases
5606  */
5607 static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5608 {
5609         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5610         void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5611
5612         pmcraid_reinit_cmdblk(cmd);
5613
5614         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5615         ioarcb->request_type = REQ_TYPE_IOACMD;
5616         ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5617         ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5618
5619         /* If this was called as part of resource table reinitialization due to
5620          * lost CCN, it is enough to return the command block back to free pool
5621          * as part of set_supported_devs completion function.
5622          */
5623         if (cmd->drv_inst->reinit_cfg_table) {
5624                 cmd->drv_inst->reinit_cfg_table = 0;
5625                 cmd->release = 1;
5626                 cmd_done = pmcraid_reinit_cfgtable_done;
5627         }
5628
5629         /* we will be done with the reset sequence after set supported devices,
5630          * setup the done function to return the command block back to free
5631          * pool
5632          */
5633         pmcraid_send_cmd(cmd,
5634                          cmd_done,
5635                          PMCRAID_SET_SUP_DEV_TIMEOUT,
5636                          pmcraid_timeout_handler);
5637         return;
5638 }
5639
5640 /**
5641  * pmcraid_set_timestamp - set the timestamp to IOAFP
5642  *
5643  * @cmd: pointer to pmcraid_cmd structure
5644  *
5645  * Return Value
5646  *  0 for success or non-zero for failure cases
5647  */
5648 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5649 {
5650         struct pmcraid_instance *pinstance = cmd->drv_inst;
5651         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5652         __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5653         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5654
5655         struct timeval tv;
5656         __le64 timestamp;
5657
5658         do_gettimeofday(&tv);
5659         timestamp = tv.tv_sec * 1000;
5660
5661         pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5662         pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5663         pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5664         pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5665         pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5666         pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
5667
5668         pmcraid_reinit_cmdblk(cmd);
5669         ioarcb->request_type = REQ_TYPE_SCSI;
5670         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5671         ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5672         ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5673         memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5674
5675         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5676                                         offsetof(struct pmcraid_ioarcb,
5677                                                 add_data.u.ioadl[0]));
5678         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5679         ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5680
5681         ioarcb->request_flags0 |= NO_LINK_DESCS;
5682         ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5683         ioarcb->data_transfer_length =
5684                 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5685         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5686         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5687         ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5688         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5689
5690         if (!pinstance->timestamp_error) {
5691                 pinstance->timestamp_error = 0;
5692                 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5693                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5694         } else {
5695                 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5696                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5697                 return;
5698         }
5699 }
5700
5701
5702 /**
5703  * pmcraid_init_res_table - Initialize the resource table
5704  * @cmd:  pointer to pmcraid command struct
5705  *
5706  * This function looks through the existing resource table, comparing
5707  * it with the config table. This function will take care of old/new
5708  * devices and schedule adding/removing them from the mid-layer
5709  * as appropriate.
5710  *
5711  * Return value
5712  *       None
5713  */
5714 static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5715 {
5716         struct pmcraid_instance *pinstance = cmd->drv_inst;
5717         struct pmcraid_resource_entry *res, *temp;
5718         struct pmcraid_config_table_entry *cfgte;
5719         unsigned long lock_flags;
5720         int found, rc, i;
5721         u16 fw_version;
5722         LIST_HEAD(old_res);
5723
5724         if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5725                 pmcraid_err("IOA requires microcode download\n");
5726
5727         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5728
5729         /* resource list is protected by pinstance->resource_lock.
5730          * init_res_table can be called from probe (user-thread) or runtime
5731          * reset (timer/tasklet)
5732          */
5733         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5734
5735         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5736                 list_move_tail(&res->queue, &old_res);
5737
5738         for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5739                 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5740                                                 PMCRAID_FW_VERSION_1)
5741                         cfgte = &pinstance->cfg_table->entries[i];
5742                 else
5743                         cfgte = (struct pmcraid_config_table_entry *)
5744                                         &pinstance->cfg_table->entries_ext[i];
5745
5746                 if (!pmcraid_expose_resource(fw_version, cfgte))
5747                         continue;
5748
5749                 found = 0;
5750
5751                 /* If this entry was already detected and initialized */
5752                 list_for_each_entry_safe(res, temp, &old_res, queue) {
5753
5754                         rc = memcmp(&res->cfg_entry.resource_address,
5755                                     &cfgte->resource_address,
5756                                     sizeof(cfgte->resource_address));
5757                         if (!rc) {
5758                                 list_move_tail(&res->queue,
5759                                                 &pinstance->used_res_q);
5760                                 found = 1;
5761                                 break;
5762                         }
5763                 }
5764
5765                 /* If this is new entry, initialize it and add it the queue */
5766                 if (!found) {
5767
5768                         if (list_empty(&pinstance->free_res_q)) {
5769                                 pmcraid_err("Too many devices attached\n");
5770                                 break;
5771                         }
5772
5773                         found = 1;
5774                         res = list_entry(pinstance->free_res_q.next,
5775                                          struct pmcraid_resource_entry, queue);
5776
5777                         res->scsi_dev = NULL;
5778                         res->change_detected = RES_CHANGE_ADD;
5779                         res->reset_progress = 0;
5780                         list_move_tail(&res->queue, &pinstance->used_res_q);
5781                 }
5782
5783                 /* copy new configuration table entry details into driver
5784                  * maintained resource entry
5785                  */
5786                 if (found) {
5787                         memcpy(&res->cfg_entry, cfgte,
5788                                         pinstance->config_table_entry_size);
5789                         pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5790                                  res->cfg_entry.resource_type,
5791                                  (fw_version <= PMCRAID_FW_VERSION_1 ?
5792                                         res->cfg_entry.unique_flags1 :
5793                                                 res->cfg_entry.array_id & 0xFF),
5794                                  le32_to_cpu(res->cfg_entry.resource_address));
5795                 }
5796         }
5797
5798         /* Detect any deleted entries, mark them for deletion from mid-layer */
5799         list_for_each_entry_safe(res, temp, &old_res, queue) {
5800
5801                 if (res->scsi_dev) {
5802                         res->change_detected = RES_CHANGE_DEL;
5803                         res->cfg_entry.resource_handle =
5804                                 PMCRAID_INVALID_RES_HANDLE;
5805                         list_move_tail(&res->queue, &pinstance->used_res_q);
5806                 } else {
5807                         list_move_tail(&res->queue, &pinstance->free_res_q);
5808                 }
5809         }
5810
5811         /* release the resource list lock */
5812         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5813         pmcraid_set_timestamp(cmd);
5814 }
5815
5816 /**
5817  * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5818  * @cmd: pointer pmcraid_cmd struct
5819  *
5820  * This function sends a Query IOA Configuration command to the adapter to
5821  * retrieve the IOA configuration table.
5822  *
5823  * Return value:
5824  *      none
5825  */
5826 static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5827 {
5828         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5829         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5830         struct pmcraid_instance *pinstance = cmd->drv_inst;
5831         int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5832
5833         if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5834                                         PMCRAID_FW_VERSION_1)
5835                 pinstance->config_table_entry_size =
5836                         sizeof(struct pmcraid_config_table_entry);
5837         else
5838                 pinstance->config_table_entry_size =
5839                         sizeof(struct pmcraid_config_table_entry_ext);
5840
5841         ioarcb->request_type = REQ_TYPE_IOACMD;
5842         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5843
5844         ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5845
5846         /* firmware requires 4-byte length field, specified in B.E format */
5847         memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5848
5849         /* Since entire config table can be described by single IOADL, it can
5850          * be part of IOARCB itself
5851          */
5852         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5853                                         offsetof(struct pmcraid_ioarcb,
5854                                                 add_data.u.ioadl[0]));
5855         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5856         ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5857
5858         ioarcb->request_flags0 |= NO_LINK_DESCS;
5859         ioarcb->data_transfer_length =
5860                 cpu_to_le32(sizeof(struct pmcraid_config_table));
5861
5862         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5863         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5864         ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5865         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5866
5867         pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5868                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5869 }
5870
5871
5872 /**
5873  * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5874  * @pdev: pointer to pci device structure
5875  * @dev_id: pointer to device ids structure
5876  *
5877  * Return Value
5878  *      returns 0 if the device is claimed and successfully configured.
5879  *      returns non-zero error code in case of any failure
5880  */
5881 static int __devinit pmcraid_probe(
5882         struct pci_dev *pdev,
5883         const struct pci_device_id *dev_id
5884 )
5885 {
5886         struct pmcraid_instance *pinstance;
5887         struct Scsi_Host *host;
5888         void __iomem *mapped_pci_addr;
5889         int rc = PCIBIOS_SUCCESSFUL;
5890
5891         if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5892                 pmcraid_err
5893                         ("maximum number(%d) of supported adapters reached\n",
5894                          atomic_read(&pmcraid_adapter_count));
5895                 return -ENOMEM;
5896         }
5897
5898         atomic_inc(&pmcraid_adapter_count);
5899         rc = pci_enable_device(pdev);
5900
5901         if (rc) {
5902                 dev_err(&pdev->dev, "Cannot enable adapter\n");
5903                 atomic_dec(&pmcraid_adapter_count);
5904                 return rc;
5905         }
5906
5907         dev_info(&pdev->dev,
5908                 "Found new IOA(%x:%x), Total IOA count: %d\n",
5909                  pdev->vendor, pdev->device,
5910                  atomic_read(&pmcraid_adapter_count));
5911
5912         rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5913
5914         if (rc < 0) {
5915                 dev_err(&pdev->dev,
5916                         "Couldn't register memory range of registers\n");
5917                 goto out_disable_device;
5918         }
5919
5920         mapped_pci_addr = pci_iomap(pdev, 0, 0);
5921
5922         if (!mapped_pci_addr) {
5923                 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5924                 rc = -ENOMEM;
5925                 goto out_release_regions;
5926         }
5927
5928         pci_set_master(pdev);
5929
5930         /* Firmware requires the system bus address of IOARCB to be within
5931          * 32-bit addressable range though it has 64-bit IOARRIN register.
5932          * However, firmware supports 64-bit streaming DMA buffers, whereas
5933          * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5934          * returns memory within 4GB (if not, change this logic), coherent
5935          * buffers are within firmware acceptible address ranges.
5936          */
5937         if ((sizeof(dma_addr_t) == 4) ||
5938             pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5939                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5940
5941         /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5942          * bit mask for pci_alloc_consistent to return addresses within 4GB
5943          */
5944         if (rc == 0)
5945                 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5946
5947         if (rc != 0) {
5948                 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5949                 goto cleanup_nomem;
5950         }
5951
5952         host = scsi_host_alloc(&pmcraid_host_template,
5953                                 sizeof(struct pmcraid_instance));
5954
5955         if (!host) {
5956                 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5957                 rc = -ENOMEM;
5958                 goto cleanup_nomem;
5959         }
5960
5961         host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5962         host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5963         host->unique_id = host->host_no;
5964         host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5965         host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5966
5967         /* zero out entire instance structure */
5968         pinstance = (struct pmcraid_instance *)host->hostdata;
5969         memset(pinstance, 0, sizeof(*pinstance));
5970
5971         pinstance->chip_cfg =
5972                 (struct pmcraid_chip_details *)(dev_id->driver_data);
5973
5974         rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5975
5976         if (rc < 0) {
5977                 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5978                 goto out_scsi_host_put;
5979         }
5980
5981         pci_set_drvdata(pdev, pinstance);
5982
5983         /* Save PCI config-space for use following the reset */
5984         rc = pci_save_state(pinstance->pdev);
5985
5986         if (rc != 0) {
5987                 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5988                 goto out_scsi_host_put;
5989         }
5990
5991         pmcraid_disable_interrupts(pinstance, ~0);
5992
5993         rc = pmcraid_register_interrupt_handler(pinstance);
5994
5995         if (rc) {
5996                 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5997                 goto out_scsi_host_put;
5998         }
5999
6000         pmcraid_init_tasklets(pinstance);
6001
6002         /* allocate verious buffers used by LLD.*/
6003         rc = pmcraid_init_buffers(pinstance);
6004
6005         if (rc) {
6006                 pmcraid_err("couldn't allocate memory blocks\n");
6007                 goto out_unregister_isr;
6008         }
6009
6010         /* check the reset type required */
6011         pmcraid_reset_type(pinstance);
6012
6013         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
6014
6015         /* Start IOA firmware initialization and bring card to Operational
6016          * state.
6017          */
6018         pmcraid_info("starting IOA initialization sequence\n");
6019         if (pmcraid_reset_bringup(pinstance)) {
6020                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
6021                 rc = 1;
6022                 goto out_release_bufs;
6023         }
6024
6025         /* Add adapter instance into mid-layer list */
6026         rc = scsi_add_host(pinstance->host, &pdev->dev);
6027         if (rc != 0) {
6028                 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
6029                 goto out_release_bufs;
6030         }
6031
6032         scsi_scan_host(pinstance->host);
6033
6034         rc = pmcraid_setup_chrdev(pinstance);
6035
6036         if (rc != 0) {
6037                 pmcraid_err("couldn't create mgmt interface, error: %x\n",
6038                              rc);
6039                 goto out_remove_host;
6040         }
6041
6042         /* Schedule worker thread to handle CCN and take care of adding and
6043          * removing devices to OS
6044          */
6045         atomic_set(&pinstance->expose_resources, 1);
6046         schedule_work(&pinstance->worker_q);
6047         return rc;
6048
6049 out_remove_host:
6050         scsi_remove_host(host);
6051
6052 out_release_bufs:
6053         pmcraid_release_buffers(pinstance);
6054
6055 out_unregister_isr:
6056         pmcraid_kill_tasklets(pinstance);
6057         pmcraid_unregister_interrupt_handler(pinstance);
6058
6059 out_scsi_host_put:
6060         scsi_host_put(host);
6061
6062 cleanup_nomem:
6063         iounmap(mapped_pci_addr);
6064
6065 out_release_regions:
6066         pci_release_regions(pdev);
6067
6068 out_disable_device:
6069         atomic_dec(&pmcraid_adapter_count);
6070         pci_set_drvdata(pdev, NULL);
6071         pci_disable_device(pdev);
6072         return -ENODEV;
6073 }
6074
6075 /*
6076  * PCI driver structure of pcmraid driver
6077  */
6078 static struct pci_driver pmcraid_driver = {
6079         .name = PMCRAID_DRIVER_NAME,
6080         .id_table = pmcraid_pci_table,
6081         .probe = pmcraid_probe,
6082         .remove = pmcraid_remove,
6083         .suspend = pmcraid_suspend,
6084         .resume = pmcraid_resume,
6085         .shutdown = pmcraid_shutdown
6086 };
6087
6088 /**
6089  * pmcraid_init - module load entry point
6090  */
6091 static int __init pmcraid_init(void)
6092 {
6093         dev_t dev;
6094         int error;
6095
6096         pmcraid_info("%s Device Driver version: %s %s\n",
6097                          PMCRAID_DRIVER_NAME,
6098                          PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE);
6099
6100         error = alloc_chrdev_region(&dev, 0,
6101                                     PMCRAID_MAX_ADAPTERS,
6102                                     PMCRAID_DEVFILE);
6103
6104         if (error) {
6105                 pmcraid_err("failed to get a major number for adapters\n");
6106                 goto out_init;
6107         }
6108
6109         pmcraid_major = MAJOR(dev);
6110         pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6111
6112         if (IS_ERR(pmcraid_class)) {
6113                 error = PTR_ERR(pmcraid_class);
6114                 pmcraid_err("failed to register with with sysfs, error = %x\n",
6115                             error);
6116                 goto out_unreg_chrdev;
6117         }
6118
6119         error = pmcraid_netlink_init();
6120
6121         if (error)
6122                 goto out_unreg_chrdev;
6123
6124         error = pci_register_driver(&pmcraid_driver);
6125
6126         if (error == 0)
6127                 goto out_init;
6128
6129         pmcraid_err("failed to register pmcraid driver, error = %x\n",
6130                      error);
6131         class_destroy(pmcraid_class);
6132         pmcraid_netlink_release();
6133
6134 out_unreg_chrdev:
6135         unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6136
6137 out_init:
6138         return error;
6139 }
6140
6141 /**
6142  * pmcraid_exit - module unload entry point
6143  */
6144 static void __exit pmcraid_exit(void)
6145 {
6146         pmcraid_netlink_release();
6147         unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6148                                  PMCRAID_MAX_ADAPTERS);
6149         pci_unregister_driver(&pmcraid_driver);
6150         class_destroy(pmcraid_class);
6151 }
6152
6153 module_init(pmcraid_init);
6154 module_exit(pmcraid_exit);