xen/blkback: Make optional features be really optional.
[linux-2.6.git] / drivers / block / cciss.c
1 /*
2  *    Disk Array driver for HP Smart Array controllers.
3  *    (C) Copyright 2000, 2007 Hewlett-Packard Development Company, L.P.
4  *
5  *    This program is free software; you can redistribute it and/or modify
6  *    it under the terms of the GNU General Public License as published by
7  *    the Free Software Foundation; version 2 of the License.
8  *
9  *    This program is distributed in the hope that it will be useful,
10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  *    General Public License for more details.
13  *
14  *    You should have received a copy of the GNU General Public License
15  *    along with this program; if not, write to the Free Software
16  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17  *    02111-1307, USA.
18  *
19  *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
20  *
21  */
22
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/pci-aspm.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/major.h>
32 #include <linux/fs.h>
33 #include <linux/bio.h>
34 #include <linux/blkpg.h>
35 #include <linux/timer.h>
36 #include <linux/proc_fs.h>
37 #include <linux/seq_file.h>
38 #include <linux/init.h>
39 #include <linux/jiffies.h>
40 #include <linux/hdreg.h>
41 #include <linux/spinlock.h>
42 #include <linux/compat.h>
43 #include <linux/mutex.h>
44 #include <asm/uaccess.h>
45 #include <asm/io.h>
46
47 #include <linux/dma-mapping.h>
48 #include <linux/blkdev.h>
49 #include <linux/genhd.h>
50 #include <linux/completion.h>
51 #include <scsi/scsi.h>
52 #include <scsi/sg.h>
53 #include <scsi/scsi_ioctl.h>
54 #include <linux/cdrom.h>
55 #include <linux/scatterlist.h>
56 #include <linux/kthread.h>
57
58 #define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
59 #define DRIVER_NAME "HP CISS Driver (v 3.6.26)"
60 #define DRIVER_VERSION CCISS_DRIVER_VERSION(3, 6, 26)
61
62 /* Embedded module documentation macros - see modules.h */
63 MODULE_AUTHOR("Hewlett-Packard Company");
64 MODULE_DESCRIPTION("Driver for HP Smart Array Controllers");
65 MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
66 MODULE_VERSION("3.6.26");
67 MODULE_LICENSE("GPL");
68 static int cciss_tape_cmds = 6;
69 module_param(cciss_tape_cmds, int, 0644);
70 MODULE_PARM_DESC(cciss_tape_cmds,
71         "number of commands to allocate for tape devices (default: 6)");
72 static int cciss_simple_mode;
73 module_param(cciss_simple_mode, int, S_IRUGO|S_IWUSR);
74 MODULE_PARM_DESC(cciss_simple_mode,
75         "Use 'simple mode' rather than 'performant mode'");
76
77 static DEFINE_MUTEX(cciss_mutex);
78 static struct proc_dir_entry *proc_cciss;
79
80 #include "cciss_cmd.h"
81 #include "cciss.h"
82 #include <linux/cciss_ioctl.h>
83
84 /* define the PCI info for the cards we can control */
85 static const struct pci_device_id cciss_pci_device_id[] = {
86         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISS,  0x0E11, 0x4070},
87         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB, 0x0E11, 0x4080},
88         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB, 0x0E11, 0x4082},
89         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB, 0x0E11, 0x4083},
90         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x4091},
91         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409A},
92         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409B},
93         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409C},
94         {PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409D},
95         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSA,     0x103C, 0x3225},
96         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3223},
97         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3234},
98         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3235},
99         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3211},
100         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3212},
101         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3213},
102         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3214},
103         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3215},
104         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3237},
105         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x323D},
106         {0,}
107 };
108
109 MODULE_DEVICE_TABLE(pci, cciss_pci_device_id);
110
111 /*  board_id = Subsystem Device ID & Vendor ID
112  *  product = Marketing Name for the board
113  *  access = Address of the struct of function pointers
114  */
115 static struct board_type products[] = {
116         {0x40700E11, "Smart Array 5300", &SA5_access},
117         {0x40800E11, "Smart Array 5i", &SA5B_access},
118         {0x40820E11, "Smart Array 532", &SA5B_access},
119         {0x40830E11, "Smart Array 5312", &SA5B_access},
120         {0x409A0E11, "Smart Array 641", &SA5_access},
121         {0x409B0E11, "Smart Array 642", &SA5_access},
122         {0x409C0E11, "Smart Array 6400", &SA5_access},
123         {0x409D0E11, "Smart Array 6400 EM", &SA5_access},
124         {0x40910E11, "Smart Array 6i", &SA5_access},
125         {0x3225103C, "Smart Array P600", &SA5_access},
126         {0x3223103C, "Smart Array P800", &SA5_access},
127         {0x3234103C, "Smart Array P400", &SA5_access},
128         {0x3235103C, "Smart Array P400i", &SA5_access},
129         {0x3211103C, "Smart Array E200i", &SA5_access},
130         {0x3212103C, "Smart Array E200", &SA5_access},
131         {0x3213103C, "Smart Array E200i", &SA5_access},
132         {0x3214103C, "Smart Array E200i", &SA5_access},
133         {0x3215103C, "Smart Array E200i", &SA5_access},
134         {0x3237103C, "Smart Array E500", &SA5_access},
135         {0x3223103C, "Smart Array P800", &SA5_access},
136         {0x3234103C, "Smart Array P400", &SA5_access},
137         {0x323D103C, "Smart Array P700m", &SA5_access},
138 };
139
140 /* How long to wait (in milliseconds) for board to go into simple mode */
141 #define MAX_CONFIG_WAIT 30000
142 #define MAX_IOCTL_CONFIG_WAIT 1000
143
144 /*define how many times we will try a command because of bus resets */
145 #define MAX_CMD_RETRIES 3
146
147 #define MAX_CTLR        32
148
149 /* Originally cciss driver only supports 8 major numbers */
150 #define MAX_CTLR_ORIG   8
151
152 static ctlr_info_t *hba[MAX_CTLR];
153
154 static struct task_struct *cciss_scan_thread;
155 static DEFINE_MUTEX(scan_mutex);
156 static LIST_HEAD(scan_q);
157
158 static void do_cciss_request(struct request_queue *q);
159 static irqreturn_t do_cciss_intx(int irq, void *dev_id);
160 static irqreturn_t do_cciss_msix_intr(int irq, void *dev_id);
161 static int cciss_open(struct block_device *bdev, fmode_t mode);
162 static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode);
163 static int cciss_release(struct gendisk *disk, fmode_t mode);
164 static int do_ioctl(struct block_device *bdev, fmode_t mode,
165                     unsigned int cmd, unsigned long arg);
166 static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
167                        unsigned int cmd, unsigned long arg);
168 static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo);
169
170 static int cciss_revalidate(struct gendisk *disk);
171 static int rebuild_lun_table(ctlr_info_t *h, int first_time, int via_ioctl);
172 static int deregister_disk(ctlr_info_t *h, int drv_index,
173                            int clear_all, int via_ioctl);
174
175 static void cciss_read_capacity(ctlr_info_t *h, int logvol,
176                         sector_t *total_size, unsigned int *block_size);
177 static void cciss_read_capacity_16(ctlr_info_t *h, int logvol,
178                         sector_t *total_size, unsigned int *block_size);
179 static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
180                         sector_t total_size,
181                         unsigned int block_size, InquiryData_struct *inq_buff,
182                                    drive_info_struct *drv);
183 static void __devinit cciss_interrupt_mode(ctlr_info_t *);
184 static int __devinit cciss_enter_simple_mode(struct ctlr_info *h);
185 static void start_io(ctlr_info_t *h);
186 static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
187                         __u8 page_code, unsigned char scsi3addr[],
188                         int cmd_type);
189 static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c,
190         int attempt_retry);
191 static int process_sendcmd_error(ctlr_info_t *h, CommandList_struct *c);
192
193 static int add_to_scan_list(struct ctlr_info *h);
194 static int scan_thread(void *data);
195 static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c);
196 static void cciss_hba_release(struct device *dev);
197 static void cciss_device_release(struct device *dev);
198 static void cciss_free_gendisk(ctlr_info_t *h, int drv_index);
199 static void cciss_free_drive_info(ctlr_info_t *h, int drv_index);
200 static inline u32 next_command(ctlr_info_t *h);
201 static int __devinit cciss_find_cfg_addrs(struct pci_dev *pdev,
202         void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
203         u64 *cfg_offset);
204 static int __devinit cciss_pci_find_memory_BAR(struct pci_dev *pdev,
205         unsigned long *memory_bar);
206 static inline u32 cciss_tag_discard_error_bits(ctlr_info_t *h, u32 tag);
207 static __devinit int write_driver_ver_to_cfgtable(
208         CfgTable_struct __iomem *cfgtable);
209
210 /* performant mode helper functions */
211 static void  calc_bucket_map(int *bucket, int num_buckets, int nsgs,
212                                 int *bucket_map);
213 static void cciss_put_controller_into_performant_mode(ctlr_info_t *h);
214
215 #ifdef CONFIG_PROC_FS
216 static void cciss_procinit(ctlr_info_t *h);
217 #else
218 static void cciss_procinit(ctlr_info_t *h)
219 {
220 }
221 #endif                          /* CONFIG_PROC_FS */
222
223 #ifdef CONFIG_COMPAT
224 static int cciss_compat_ioctl(struct block_device *, fmode_t,
225                               unsigned, unsigned long);
226 #endif
227
228 static const struct block_device_operations cciss_fops = {
229         .owner = THIS_MODULE,
230         .open = cciss_unlocked_open,
231         .release = cciss_release,
232         .ioctl = do_ioctl,
233         .getgeo = cciss_getgeo,
234 #ifdef CONFIG_COMPAT
235         .compat_ioctl = cciss_compat_ioctl,
236 #endif
237         .revalidate_disk = cciss_revalidate,
238 };
239
240 /* set_performant_mode: Modify the tag for cciss performant
241  * set bit 0 for pull model, bits 3-1 for block fetch
242  * register number
243  */
244 static void set_performant_mode(ctlr_info_t *h, CommandList_struct *c)
245 {
246         if (likely(h->transMethod & CFGTBL_Trans_Performant))
247                 c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
248 }
249
250 /*
251  * Enqueuing and dequeuing functions for cmdlists.
252  */
253 static inline void addQ(struct list_head *list, CommandList_struct *c)
254 {
255         list_add_tail(&c->list, list);
256 }
257
258 static inline void removeQ(CommandList_struct *c)
259 {
260         /*
261          * After kexec/dump some commands might still
262          * be in flight, which the firmware will try
263          * to complete. Resetting the firmware doesn't work
264          * with old fw revisions, so we have to mark
265          * them off as 'stale' to prevent the driver from
266          * falling over.
267          */
268         if (WARN_ON(list_empty(&c->list))) {
269                 c->cmd_type = CMD_MSG_STALE;
270                 return;
271         }
272
273         list_del_init(&c->list);
274 }
275
276 static void enqueue_cmd_and_start_io(ctlr_info_t *h,
277         CommandList_struct *c)
278 {
279         unsigned long flags;
280         set_performant_mode(h, c);
281         spin_lock_irqsave(&h->lock, flags);
282         addQ(&h->reqQ, c);
283         h->Qdepth++;
284         if (h->Qdepth > h->maxQsinceinit)
285                 h->maxQsinceinit = h->Qdepth;
286         start_io(h);
287         spin_unlock_irqrestore(&h->lock, flags);
288 }
289
290 static void cciss_free_sg_chain_blocks(SGDescriptor_struct **cmd_sg_list,
291         int nr_cmds)
292 {
293         int i;
294
295         if (!cmd_sg_list)
296                 return;
297         for (i = 0; i < nr_cmds; i++) {
298                 kfree(cmd_sg_list[i]);
299                 cmd_sg_list[i] = NULL;
300         }
301         kfree(cmd_sg_list);
302 }
303
304 static SGDescriptor_struct **cciss_allocate_sg_chain_blocks(
305         ctlr_info_t *h, int chainsize, int nr_cmds)
306 {
307         int j;
308         SGDescriptor_struct **cmd_sg_list;
309
310         if (chainsize <= 0)
311                 return NULL;
312
313         cmd_sg_list = kmalloc(sizeof(*cmd_sg_list) * nr_cmds, GFP_KERNEL);
314         if (!cmd_sg_list)
315                 return NULL;
316
317         /* Build up chain blocks for each command */
318         for (j = 0; j < nr_cmds; j++) {
319                 /* Need a block of chainsized s/g elements. */
320                 cmd_sg_list[j] = kmalloc((chainsize *
321                         sizeof(*cmd_sg_list[j])), GFP_KERNEL);
322                 if (!cmd_sg_list[j]) {
323                         dev_err(&h->pdev->dev, "Cannot get memory "
324                                 "for s/g chains.\n");
325                         goto clean;
326                 }
327         }
328         return cmd_sg_list;
329 clean:
330         cciss_free_sg_chain_blocks(cmd_sg_list, nr_cmds);
331         return NULL;
332 }
333
334 static void cciss_unmap_sg_chain_block(ctlr_info_t *h, CommandList_struct *c)
335 {
336         SGDescriptor_struct *chain_sg;
337         u64bit temp64;
338
339         if (c->Header.SGTotal <= h->max_cmd_sgentries)
340                 return;
341
342         chain_sg = &c->SG[h->max_cmd_sgentries - 1];
343         temp64.val32.lower = chain_sg->Addr.lower;
344         temp64.val32.upper = chain_sg->Addr.upper;
345         pci_unmap_single(h->pdev, temp64.val, chain_sg->Len, PCI_DMA_TODEVICE);
346 }
347
348 static void cciss_map_sg_chain_block(ctlr_info_t *h, CommandList_struct *c,
349         SGDescriptor_struct *chain_block, int len)
350 {
351         SGDescriptor_struct *chain_sg;
352         u64bit temp64;
353
354         chain_sg = &c->SG[h->max_cmd_sgentries - 1];
355         chain_sg->Ext = CCISS_SG_CHAIN;
356         chain_sg->Len = len;
357         temp64.val = pci_map_single(h->pdev, chain_block, len,
358                                 PCI_DMA_TODEVICE);
359         chain_sg->Addr.lower = temp64.val32.lower;
360         chain_sg->Addr.upper = temp64.val32.upper;
361 }
362
363 #include "cciss_scsi.c"         /* For SCSI tape support */
364
365 static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
366         "UNKNOWN"
367 };
368 #define RAID_UNKNOWN (ARRAY_SIZE(raid_label)-1)
369
370 #ifdef CONFIG_PROC_FS
371
372 /*
373  * Report information about this controller.
374  */
375 #define ENG_GIG 1000000000
376 #define ENG_GIG_FACTOR (ENG_GIG/512)
377 #define ENGAGE_SCSI     "engage scsi"
378
379 static void cciss_seq_show_header(struct seq_file *seq)
380 {
381         ctlr_info_t *h = seq->private;
382
383         seq_printf(seq, "%s: HP %s Controller\n"
384                 "Board ID: 0x%08lx\n"
385                 "Firmware Version: %c%c%c%c\n"
386                 "IRQ: %d\n"
387                 "Logical drives: %d\n"
388                 "Current Q depth: %d\n"
389                 "Current # commands on controller: %d\n"
390                 "Max Q depth since init: %d\n"
391                 "Max # commands on controller since init: %d\n"
392                 "Max SG entries since init: %d\n",
393                 h->devname,
394                 h->product_name,
395                 (unsigned long)h->board_id,
396                 h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
397                 h->firm_ver[3], (unsigned int)h->intr[h->intr_mode],
398                 h->num_luns,
399                 h->Qdepth, h->commands_outstanding,
400                 h->maxQsinceinit, h->max_outstanding, h->maxSG);
401
402 #ifdef CONFIG_CISS_SCSI_TAPE
403         cciss_seq_tape_report(seq, h);
404 #endif /* CONFIG_CISS_SCSI_TAPE */
405 }
406
407 static void *cciss_seq_start(struct seq_file *seq, loff_t *pos)
408 {
409         ctlr_info_t *h = seq->private;
410         unsigned long flags;
411
412         /* prevent displaying bogus info during configuration
413          * or deconfiguration of a logical volume
414          */
415         spin_lock_irqsave(&h->lock, flags);
416         if (h->busy_configuring) {
417                 spin_unlock_irqrestore(&h->lock, flags);
418                 return ERR_PTR(-EBUSY);
419         }
420         h->busy_configuring = 1;
421         spin_unlock_irqrestore(&h->lock, flags);
422
423         if (*pos == 0)
424                 cciss_seq_show_header(seq);
425
426         return pos;
427 }
428
429 static int cciss_seq_show(struct seq_file *seq, void *v)
430 {
431         sector_t vol_sz, vol_sz_frac;
432         ctlr_info_t *h = seq->private;
433         unsigned ctlr = h->ctlr;
434         loff_t *pos = v;
435         drive_info_struct *drv = h->drv[*pos];
436
437         if (*pos > h->highest_lun)
438                 return 0;
439
440         if (drv == NULL) /* it's possible for h->drv[] to have holes. */
441                 return 0;
442
443         if (drv->heads == 0)
444                 return 0;
445
446         vol_sz = drv->nr_blocks;
447         vol_sz_frac = sector_div(vol_sz, ENG_GIG_FACTOR);
448         vol_sz_frac *= 100;
449         sector_div(vol_sz_frac, ENG_GIG_FACTOR);
450
451         if (drv->raid_level < 0 || drv->raid_level > RAID_UNKNOWN)
452                 drv->raid_level = RAID_UNKNOWN;
453         seq_printf(seq, "cciss/c%dd%d:"
454                         "\t%4u.%02uGB\tRAID %s\n",
455                         ctlr, (int) *pos, (int)vol_sz, (int)vol_sz_frac,
456                         raid_label[drv->raid_level]);
457         return 0;
458 }
459
460 static void *cciss_seq_next(struct seq_file *seq, void *v, loff_t *pos)
461 {
462         ctlr_info_t *h = seq->private;
463
464         if (*pos > h->highest_lun)
465                 return NULL;
466         *pos += 1;
467
468         return pos;
469 }
470
471 static void cciss_seq_stop(struct seq_file *seq, void *v)
472 {
473         ctlr_info_t *h = seq->private;
474
475         /* Only reset h->busy_configuring if we succeeded in setting
476          * it during cciss_seq_start. */
477         if (v == ERR_PTR(-EBUSY))
478                 return;
479
480         h->busy_configuring = 0;
481 }
482
483 static const struct seq_operations cciss_seq_ops = {
484         .start = cciss_seq_start,
485         .show  = cciss_seq_show,
486         .next  = cciss_seq_next,
487         .stop  = cciss_seq_stop,
488 };
489
490 static int cciss_seq_open(struct inode *inode, struct file *file)
491 {
492         int ret = seq_open(file, &cciss_seq_ops);
493         struct seq_file *seq = file->private_data;
494
495         if (!ret)
496                 seq->private = PDE(inode)->data;
497
498         return ret;
499 }
500
501 static ssize_t
502 cciss_proc_write(struct file *file, const char __user *buf,
503                  size_t length, loff_t *ppos)
504 {
505         int err;
506         char *buffer;
507
508 #ifndef CONFIG_CISS_SCSI_TAPE
509         return -EINVAL;
510 #endif
511
512         if (!buf || length > PAGE_SIZE - 1)
513                 return -EINVAL;
514
515         buffer = (char *)__get_free_page(GFP_KERNEL);
516         if (!buffer)
517                 return -ENOMEM;
518
519         err = -EFAULT;
520         if (copy_from_user(buffer, buf, length))
521                 goto out;
522         buffer[length] = '\0';
523
524 #ifdef CONFIG_CISS_SCSI_TAPE
525         if (strncmp(ENGAGE_SCSI, buffer, sizeof ENGAGE_SCSI - 1) == 0) {
526                 struct seq_file *seq = file->private_data;
527                 ctlr_info_t *h = seq->private;
528
529                 err = cciss_engage_scsi(h);
530                 if (err == 0)
531                         err = length;
532         } else
533 #endif /* CONFIG_CISS_SCSI_TAPE */
534                 err = -EINVAL;
535         /* might be nice to have "disengage" too, but it's not
536            safely possible. (only 1 module use count, lock issues.) */
537
538 out:
539         free_page((unsigned long)buffer);
540         return err;
541 }
542
543 static const struct file_operations cciss_proc_fops = {
544         .owner   = THIS_MODULE,
545         .open    = cciss_seq_open,
546         .read    = seq_read,
547         .llseek  = seq_lseek,
548         .release = seq_release,
549         .write   = cciss_proc_write,
550 };
551
552 static void __devinit cciss_procinit(ctlr_info_t *h)
553 {
554         struct proc_dir_entry *pde;
555
556         if (proc_cciss == NULL)
557                 proc_cciss = proc_mkdir("driver/cciss", NULL);
558         if (!proc_cciss)
559                 return;
560         pde = proc_create_data(h->devname, S_IWUSR | S_IRUSR | S_IRGRP |
561                                         S_IROTH, proc_cciss,
562                                         &cciss_proc_fops, h);
563 }
564 #endif                          /* CONFIG_PROC_FS */
565
566 #define MAX_PRODUCT_NAME_LEN 19
567
568 #define to_hba(n) container_of(n, struct ctlr_info, dev)
569 #define to_drv(n) container_of(n, drive_info_struct, dev)
570
571 /* List of controllers which cannot be hard reset on kexec with reset_devices */
572 static u32 unresettable_controller[] = {
573         0x324a103C, /* Smart Array P712m */
574         0x324b103C, /* SmartArray P711m */
575         0x3223103C, /* Smart Array P800 */
576         0x3234103C, /* Smart Array P400 */
577         0x3235103C, /* Smart Array P400i */
578         0x3211103C, /* Smart Array E200i */
579         0x3212103C, /* Smart Array E200 */
580         0x3213103C, /* Smart Array E200i */
581         0x3214103C, /* Smart Array E200i */
582         0x3215103C, /* Smart Array E200i */
583         0x3237103C, /* Smart Array E500 */
584         0x323D103C, /* Smart Array P700m */
585         0x409C0E11, /* Smart Array 6400 */
586         0x409D0E11, /* Smart Array 6400 EM */
587 };
588
589 /* List of controllers which cannot even be soft reset */
590 static u32 soft_unresettable_controller[] = {
591         0x409C0E11, /* Smart Array 6400 */
592         0x409D0E11, /* Smart Array 6400 EM */
593 };
594
595 static int ctlr_is_hard_resettable(u32 board_id)
596 {
597         int i;
598
599         for (i = 0; i < ARRAY_SIZE(unresettable_controller); i++)
600                 if (unresettable_controller[i] == board_id)
601                         return 0;
602         return 1;
603 }
604
605 static int ctlr_is_soft_resettable(u32 board_id)
606 {
607         int i;
608
609         for (i = 0; i < ARRAY_SIZE(soft_unresettable_controller); i++)
610                 if (soft_unresettable_controller[i] == board_id)
611                         return 0;
612         return 1;
613 }
614
615 static int ctlr_is_resettable(u32 board_id)
616 {
617         return ctlr_is_hard_resettable(board_id) ||
618                 ctlr_is_soft_resettable(board_id);
619 }
620
621 static ssize_t host_show_resettable(struct device *dev,
622                                     struct device_attribute *attr,
623                                     char *buf)
624 {
625         struct ctlr_info *h = to_hba(dev);
626
627         return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h->board_id));
628 }
629 static DEVICE_ATTR(resettable, S_IRUGO, host_show_resettable, NULL);
630
631 static ssize_t host_store_rescan(struct device *dev,
632                                  struct device_attribute *attr,
633                                  const char *buf, size_t count)
634 {
635         struct ctlr_info *h = to_hba(dev);
636
637         add_to_scan_list(h);
638         wake_up_process(cciss_scan_thread);
639         wait_for_completion_interruptible(&h->scan_wait);
640
641         return count;
642 }
643 static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
644
645 static ssize_t host_show_transport_mode(struct device *dev,
646                                  struct device_attribute *attr,
647                                  char *buf)
648 {
649         struct ctlr_info *h = to_hba(dev);
650
651         return snprintf(buf, 20, "%s\n",
652                 h->transMethod & CFGTBL_Trans_Performant ?
653                         "performant" : "simple");
654 }
655 static DEVICE_ATTR(transport_mode, S_IRUGO, host_show_transport_mode, NULL);
656
657 static ssize_t dev_show_unique_id(struct device *dev,
658                                  struct device_attribute *attr,
659                                  char *buf)
660 {
661         drive_info_struct *drv = to_drv(dev);
662         struct ctlr_info *h = to_hba(drv->dev.parent);
663         __u8 sn[16];
664         unsigned long flags;
665         int ret = 0;
666
667         spin_lock_irqsave(&h->lock, flags);
668         if (h->busy_configuring)
669                 ret = -EBUSY;
670         else
671                 memcpy(sn, drv->serial_no, sizeof(sn));
672         spin_unlock_irqrestore(&h->lock, flags);
673
674         if (ret)
675                 return ret;
676         else
677                 return snprintf(buf, 16 * 2 + 2,
678                                 "%02X%02X%02X%02X%02X%02X%02X%02X"
679                                 "%02X%02X%02X%02X%02X%02X%02X%02X\n",
680                                 sn[0], sn[1], sn[2], sn[3],
681                                 sn[4], sn[5], sn[6], sn[7],
682                                 sn[8], sn[9], sn[10], sn[11],
683                                 sn[12], sn[13], sn[14], sn[15]);
684 }
685 static DEVICE_ATTR(unique_id, S_IRUGO, dev_show_unique_id, NULL);
686
687 static ssize_t dev_show_vendor(struct device *dev,
688                                struct device_attribute *attr,
689                                char *buf)
690 {
691         drive_info_struct *drv = to_drv(dev);
692         struct ctlr_info *h = to_hba(drv->dev.parent);
693         char vendor[VENDOR_LEN + 1];
694         unsigned long flags;
695         int ret = 0;
696
697         spin_lock_irqsave(&h->lock, flags);
698         if (h->busy_configuring)
699                 ret = -EBUSY;
700         else
701                 memcpy(vendor, drv->vendor, VENDOR_LEN + 1);
702         spin_unlock_irqrestore(&h->lock, flags);
703
704         if (ret)
705                 return ret;
706         else
707                 return snprintf(buf, sizeof(vendor) + 1, "%s\n", drv->vendor);
708 }
709 static DEVICE_ATTR(vendor, S_IRUGO, dev_show_vendor, NULL);
710
711 static ssize_t dev_show_model(struct device *dev,
712                               struct device_attribute *attr,
713                               char *buf)
714 {
715         drive_info_struct *drv = to_drv(dev);
716         struct ctlr_info *h = to_hba(drv->dev.parent);
717         char model[MODEL_LEN + 1];
718         unsigned long flags;
719         int ret = 0;
720
721         spin_lock_irqsave(&h->lock, flags);
722         if (h->busy_configuring)
723                 ret = -EBUSY;
724         else
725                 memcpy(model, drv->model, MODEL_LEN + 1);
726         spin_unlock_irqrestore(&h->lock, flags);
727
728         if (ret)
729                 return ret;
730         else
731                 return snprintf(buf, sizeof(model) + 1, "%s\n", drv->model);
732 }
733 static DEVICE_ATTR(model, S_IRUGO, dev_show_model, NULL);
734
735 static ssize_t dev_show_rev(struct device *dev,
736                             struct device_attribute *attr,
737                             char *buf)
738 {
739         drive_info_struct *drv = to_drv(dev);
740         struct ctlr_info *h = to_hba(drv->dev.parent);
741         char rev[REV_LEN + 1];
742         unsigned long flags;
743         int ret = 0;
744
745         spin_lock_irqsave(&h->lock, flags);
746         if (h->busy_configuring)
747                 ret = -EBUSY;
748         else
749                 memcpy(rev, drv->rev, REV_LEN + 1);
750         spin_unlock_irqrestore(&h->lock, flags);
751
752         if (ret)
753                 return ret;
754         else
755                 return snprintf(buf, sizeof(rev) + 1, "%s\n", drv->rev);
756 }
757 static DEVICE_ATTR(rev, S_IRUGO, dev_show_rev, NULL);
758
759 static ssize_t cciss_show_lunid(struct device *dev,
760                                 struct device_attribute *attr, char *buf)
761 {
762         drive_info_struct *drv = to_drv(dev);
763         struct ctlr_info *h = to_hba(drv->dev.parent);
764         unsigned long flags;
765         unsigned char lunid[8];
766
767         spin_lock_irqsave(&h->lock, flags);
768         if (h->busy_configuring) {
769                 spin_unlock_irqrestore(&h->lock, flags);
770                 return -EBUSY;
771         }
772         if (!drv->heads) {
773                 spin_unlock_irqrestore(&h->lock, flags);
774                 return -ENOTTY;
775         }
776         memcpy(lunid, drv->LunID, sizeof(lunid));
777         spin_unlock_irqrestore(&h->lock, flags);
778         return snprintf(buf, 20, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
779                 lunid[0], lunid[1], lunid[2], lunid[3],
780                 lunid[4], lunid[5], lunid[6], lunid[7]);
781 }
782 static DEVICE_ATTR(lunid, S_IRUGO, cciss_show_lunid, NULL);
783
784 static ssize_t cciss_show_raid_level(struct device *dev,
785                                      struct device_attribute *attr, char *buf)
786 {
787         drive_info_struct *drv = to_drv(dev);
788         struct ctlr_info *h = to_hba(drv->dev.parent);
789         int raid;
790         unsigned long flags;
791
792         spin_lock_irqsave(&h->lock, flags);
793         if (h->busy_configuring) {
794                 spin_unlock_irqrestore(&h->lock, flags);
795                 return -EBUSY;
796         }
797         raid = drv->raid_level;
798         spin_unlock_irqrestore(&h->lock, flags);
799         if (raid < 0 || raid > RAID_UNKNOWN)
800                 raid = RAID_UNKNOWN;
801
802         return snprintf(buf, strlen(raid_label[raid]) + 7, "RAID %s\n",
803                         raid_label[raid]);
804 }
805 static DEVICE_ATTR(raid_level, S_IRUGO, cciss_show_raid_level, NULL);
806
807 static ssize_t cciss_show_usage_count(struct device *dev,
808                                       struct device_attribute *attr, char *buf)
809 {
810         drive_info_struct *drv = to_drv(dev);
811         struct ctlr_info *h = to_hba(drv->dev.parent);
812         unsigned long flags;
813         int count;
814
815         spin_lock_irqsave(&h->lock, flags);
816         if (h->busy_configuring) {
817                 spin_unlock_irqrestore(&h->lock, flags);
818                 return -EBUSY;
819         }
820         count = drv->usage_count;
821         spin_unlock_irqrestore(&h->lock, flags);
822         return snprintf(buf, 20, "%d\n", count);
823 }
824 static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);
825
826 static struct attribute *cciss_host_attrs[] = {
827         &dev_attr_rescan.attr,
828         &dev_attr_resettable.attr,
829         &dev_attr_transport_mode.attr,
830         NULL
831 };
832
833 static struct attribute_group cciss_host_attr_group = {
834         .attrs = cciss_host_attrs,
835 };
836
837 static const struct attribute_group *cciss_host_attr_groups[] = {
838         &cciss_host_attr_group,
839         NULL
840 };
841
842 static struct device_type cciss_host_type = {
843         .name           = "cciss_host",
844         .groups         = cciss_host_attr_groups,
845         .release        = cciss_hba_release,
846 };
847
848 static struct attribute *cciss_dev_attrs[] = {
849         &dev_attr_unique_id.attr,
850         &dev_attr_model.attr,
851         &dev_attr_vendor.attr,
852         &dev_attr_rev.attr,
853         &dev_attr_lunid.attr,
854         &dev_attr_raid_level.attr,
855         &dev_attr_usage_count.attr,
856         NULL
857 };
858
859 static struct attribute_group cciss_dev_attr_group = {
860         .attrs = cciss_dev_attrs,
861 };
862
863 static const struct attribute_group *cciss_dev_attr_groups[] = {
864         &cciss_dev_attr_group,
865         NULL
866 };
867
868 static struct device_type cciss_dev_type = {
869         .name           = "cciss_device",
870         .groups         = cciss_dev_attr_groups,
871         .release        = cciss_device_release,
872 };
873
874 static struct bus_type cciss_bus_type = {
875         .name           = "cciss",
876 };
877
878 /*
879  * cciss_hba_release is called when the reference count
880  * of h->dev goes to zero.
881  */
882 static void cciss_hba_release(struct device *dev)
883 {
884         /*
885          * nothing to do, but need this to avoid a warning
886          * about not having a release handler from lib/kref.c.
887          */
888 }
889
890 /*
891  * Initialize sysfs entry for each controller.  This sets up and registers
892  * the 'cciss#' directory for each individual controller under
893  * /sys/bus/pci/devices/<dev>/.
894  */
895 static int cciss_create_hba_sysfs_entry(struct ctlr_info *h)
896 {
897         device_initialize(&h->dev);
898         h->dev.type = &cciss_host_type;
899         h->dev.bus = &cciss_bus_type;
900         dev_set_name(&h->dev, "%s", h->devname);
901         h->dev.parent = &h->pdev->dev;
902
903         return device_add(&h->dev);
904 }
905
906 /*
907  * Remove sysfs entries for an hba.
908  */
909 static void cciss_destroy_hba_sysfs_entry(struct ctlr_info *h)
910 {
911         device_del(&h->dev);
912         put_device(&h->dev); /* final put. */
913 }
914
915 /* cciss_device_release is called when the reference count
916  * of h->drv[x]dev goes to zero.
917  */
918 static void cciss_device_release(struct device *dev)
919 {
920         drive_info_struct *drv = to_drv(dev);
921         kfree(drv);
922 }
923
924 /*
925  * Initialize sysfs for each logical drive.  This sets up and registers
926  * the 'c#d#' directory for each individual logical drive under
927  * /sys/bus/pci/devices/<dev/ccis#/. We also create a link from
928  * /sys/block/cciss!c#d# to this entry.
929  */
930 static long cciss_create_ld_sysfs_entry(struct ctlr_info *h,
931                                        int drv_index)
932 {
933         struct device *dev;
934
935         if (h->drv[drv_index]->device_initialized)
936                 return 0;
937
938         dev = &h->drv[drv_index]->dev;
939         device_initialize(dev);
940         dev->type = &cciss_dev_type;
941         dev->bus = &cciss_bus_type;
942         dev_set_name(dev, "c%dd%d", h->ctlr, drv_index);
943         dev->parent = &h->dev;
944         h->drv[drv_index]->device_initialized = 1;
945         return device_add(dev);
946 }
947
948 /*
949  * Remove sysfs entries for a logical drive.
950  */
951 static void cciss_destroy_ld_sysfs_entry(struct ctlr_info *h, int drv_index,
952         int ctlr_exiting)
953 {
954         struct device *dev = &h->drv[drv_index]->dev;
955
956         /* special case for c*d0, we only destroy it on controller exit */
957         if (drv_index == 0 && !ctlr_exiting)
958                 return;
959
960         device_del(dev);
961         put_device(dev); /* the "final" put. */
962         h->drv[drv_index] = NULL;
963 }
964
965 /*
966  * For operations that cannot sleep, a command block is allocated at init,
967  * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
968  * which ones are free or in use.
969  */
970 static CommandList_struct *cmd_alloc(ctlr_info_t *h)
971 {
972         CommandList_struct *c;
973         int i;
974         u64bit temp64;
975         dma_addr_t cmd_dma_handle, err_dma_handle;
976
977         do {
978                 i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
979                 if (i == h->nr_cmds)
980                         return NULL;
981         } while (test_and_set_bit(i & (BITS_PER_LONG - 1),
982                   h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
983         c = h->cmd_pool + i;
984         memset(c, 0, sizeof(CommandList_struct));
985         cmd_dma_handle = h->cmd_pool_dhandle + i * sizeof(CommandList_struct);
986         c->err_info = h->errinfo_pool + i;
987         memset(c->err_info, 0, sizeof(ErrorInfo_struct));
988         err_dma_handle = h->errinfo_pool_dhandle
989             + i * sizeof(ErrorInfo_struct);
990         h->nr_allocs++;
991
992         c->cmdindex = i;
993
994         INIT_LIST_HEAD(&c->list);
995         c->busaddr = (__u32) cmd_dma_handle;
996         temp64.val = (__u64) err_dma_handle;
997         c->ErrDesc.Addr.lower = temp64.val32.lower;
998         c->ErrDesc.Addr.upper = temp64.val32.upper;
999         c->ErrDesc.Len = sizeof(ErrorInfo_struct);
1000
1001         c->ctlr = h->ctlr;
1002         return c;
1003 }
1004
1005 /* allocate a command using pci_alloc_consistent, used for ioctls,
1006  * etc., not for the main i/o path.
1007  */
1008 static CommandList_struct *cmd_special_alloc(ctlr_info_t *h)
1009 {
1010         CommandList_struct *c;
1011         u64bit temp64;
1012         dma_addr_t cmd_dma_handle, err_dma_handle;
1013
1014         c = (CommandList_struct *) pci_alloc_consistent(h->pdev,
1015                 sizeof(CommandList_struct), &cmd_dma_handle);
1016         if (c == NULL)
1017                 return NULL;
1018         memset(c, 0, sizeof(CommandList_struct));
1019
1020         c->cmdindex = -1;
1021
1022         c->err_info = (ErrorInfo_struct *)
1023             pci_alloc_consistent(h->pdev, sizeof(ErrorInfo_struct),
1024                     &err_dma_handle);
1025
1026         if (c->err_info == NULL) {
1027                 pci_free_consistent(h->pdev,
1028                         sizeof(CommandList_struct), c, cmd_dma_handle);
1029                 return NULL;
1030         }
1031         memset(c->err_info, 0, sizeof(ErrorInfo_struct));
1032
1033         INIT_LIST_HEAD(&c->list);
1034         c->busaddr = (__u32) cmd_dma_handle;
1035         temp64.val = (__u64) err_dma_handle;
1036         c->ErrDesc.Addr.lower = temp64.val32.lower;
1037         c->ErrDesc.Addr.upper = temp64.val32.upper;
1038         c->ErrDesc.Len = sizeof(ErrorInfo_struct);
1039
1040         c->ctlr = h->ctlr;
1041         return c;
1042 }
1043
1044 static void cmd_free(ctlr_info_t *h, CommandList_struct *c)
1045 {
1046         int i;
1047
1048         i = c - h->cmd_pool;
1049         clear_bit(i & (BITS_PER_LONG - 1),
1050                   h->cmd_pool_bits + (i / BITS_PER_LONG));
1051         h->nr_frees++;
1052 }
1053
1054 static void cmd_special_free(ctlr_info_t *h, CommandList_struct *c)
1055 {
1056         u64bit temp64;
1057
1058         temp64.val32.lower = c->ErrDesc.Addr.lower;
1059         temp64.val32.upper = c->ErrDesc.Addr.upper;
1060         pci_free_consistent(h->pdev, sizeof(ErrorInfo_struct),
1061                             c->err_info, (dma_addr_t) temp64.val);
1062         pci_free_consistent(h->pdev, sizeof(CommandList_struct), c,
1063                 (dma_addr_t) cciss_tag_discard_error_bits(h, (u32) c->busaddr));
1064 }
1065
1066 static inline ctlr_info_t *get_host(struct gendisk *disk)
1067 {
1068         return disk->queue->queuedata;
1069 }
1070
1071 static inline drive_info_struct *get_drv(struct gendisk *disk)
1072 {
1073         return disk->private_data;
1074 }
1075
1076 /*
1077  * Open.  Make sure the device is really there.
1078  */
1079 static int cciss_open(struct block_device *bdev, fmode_t mode)
1080 {
1081         ctlr_info_t *h = get_host(bdev->bd_disk);
1082         drive_info_struct *drv = get_drv(bdev->bd_disk);
1083
1084         dev_dbg(&h->pdev->dev, "cciss_open %s\n", bdev->bd_disk->disk_name);
1085         if (drv->busy_configuring)
1086                 return -EBUSY;
1087         /*
1088          * Root is allowed to open raw volume zero even if it's not configured
1089          * so array config can still work. Root is also allowed to open any
1090          * volume that has a LUN ID, so it can issue IOCTL to reread the
1091          * disk information.  I don't think I really like this
1092          * but I'm already using way to many device nodes to claim another one
1093          * for "raw controller".
1094          */
1095         if (drv->heads == 0) {
1096                 if (MINOR(bdev->bd_dev) != 0) { /* not node 0? */
1097                         /* if not node 0 make sure it is a partition = 0 */
1098                         if (MINOR(bdev->bd_dev) & 0x0f) {
1099                                 return -ENXIO;
1100                                 /* if it is, make sure we have a LUN ID */
1101                         } else if (memcmp(drv->LunID, CTLR_LUNID,
1102                                 sizeof(drv->LunID))) {
1103                                 return -ENXIO;
1104                         }
1105                 }
1106                 if (!capable(CAP_SYS_ADMIN))
1107                         return -EPERM;
1108         }
1109         drv->usage_count++;
1110         h->usage_count++;
1111         return 0;
1112 }
1113
1114 static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode)
1115 {
1116         int ret;
1117
1118         mutex_lock(&cciss_mutex);
1119         ret = cciss_open(bdev, mode);
1120         mutex_unlock(&cciss_mutex);
1121
1122         return ret;
1123 }
1124
1125 /*
1126  * Close.  Sync first.
1127  */
1128 static int cciss_release(struct gendisk *disk, fmode_t mode)
1129 {
1130         ctlr_info_t *h;
1131         drive_info_struct *drv;
1132
1133         mutex_lock(&cciss_mutex);
1134         h = get_host(disk);
1135         drv = get_drv(disk);
1136         dev_dbg(&h->pdev->dev, "cciss_release %s\n", disk->disk_name);
1137         drv->usage_count--;
1138         h->usage_count--;
1139         mutex_unlock(&cciss_mutex);
1140         return 0;
1141 }
1142
1143 static int do_ioctl(struct block_device *bdev, fmode_t mode,
1144                     unsigned cmd, unsigned long arg)
1145 {
1146         int ret;
1147         mutex_lock(&cciss_mutex);
1148         ret = cciss_ioctl(bdev, mode, cmd, arg);
1149         mutex_unlock(&cciss_mutex);
1150         return ret;
1151 }
1152
1153 #ifdef CONFIG_COMPAT
1154
1155 static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
1156                                   unsigned cmd, unsigned long arg);
1157 static int cciss_ioctl32_big_passthru(struct block_device *bdev, fmode_t mode,
1158                                       unsigned cmd, unsigned long arg);
1159
1160 static int cciss_compat_ioctl(struct block_device *bdev, fmode_t mode,
1161                               unsigned cmd, unsigned long arg)
1162 {
1163         switch (cmd) {
1164         case CCISS_GETPCIINFO:
1165         case CCISS_GETINTINFO:
1166         case CCISS_SETINTINFO:
1167         case CCISS_GETNODENAME:
1168         case CCISS_SETNODENAME:
1169         case CCISS_GETHEARTBEAT:
1170         case CCISS_GETBUSTYPES:
1171         case CCISS_GETFIRMVER:
1172         case CCISS_GETDRIVVER:
1173         case CCISS_REVALIDVOLS:
1174         case CCISS_DEREGDISK:
1175         case CCISS_REGNEWDISK:
1176         case CCISS_REGNEWD:
1177         case CCISS_RESCANDISK:
1178         case CCISS_GETLUNINFO:
1179                 return do_ioctl(bdev, mode, cmd, arg);
1180
1181         case CCISS_PASSTHRU32:
1182                 return cciss_ioctl32_passthru(bdev, mode, cmd, arg);
1183         case CCISS_BIG_PASSTHRU32:
1184                 return cciss_ioctl32_big_passthru(bdev, mode, cmd, arg);
1185
1186         default:
1187                 return -ENOIOCTLCMD;
1188         }
1189 }
1190
1191 static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
1192                                   unsigned cmd, unsigned long arg)
1193 {
1194         IOCTL32_Command_struct __user *arg32 =
1195             (IOCTL32_Command_struct __user *) arg;
1196         IOCTL_Command_struct arg64;
1197         IOCTL_Command_struct __user *p = compat_alloc_user_space(sizeof(arg64));
1198         int err;
1199         u32 cp;
1200
1201         err = 0;
1202         err |=
1203             copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
1204                            sizeof(arg64.LUN_info));
1205         err |=
1206             copy_from_user(&arg64.Request, &arg32->Request,
1207                            sizeof(arg64.Request));
1208         err |=
1209             copy_from_user(&arg64.error_info, &arg32->error_info,
1210                            sizeof(arg64.error_info));
1211         err |= get_user(arg64.buf_size, &arg32->buf_size);
1212         err |= get_user(cp, &arg32->buf);
1213         arg64.buf = compat_ptr(cp);
1214         err |= copy_to_user(p, &arg64, sizeof(arg64));
1215
1216         if (err)
1217                 return -EFAULT;
1218
1219         err = do_ioctl(bdev, mode, CCISS_PASSTHRU, (unsigned long)p);
1220         if (err)
1221                 return err;
1222         err |=
1223             copy_in_user(&arg32->error_info, &p->error_info,
1224                          sizeof(arg32->error_info));
1225         if (err)
1226                 return -EFAULT;
1227         return err;
1228 }
1229
1230 static int cciss_ioctl32_big_passthru(struct block_device *bdev, fmode_t mode,
1231                                       unsigned cmd, unsigned long arg)
1232 {
1233         BIG_IOCTL32_Command_struct __user *arg32 =
1234             (BIG_IOCTL32_Command_struct __user *) arg;
1235         BIG_IOCTL_Command_struct arg64;
1236         BIG_IOCTL_Command_struct __user *p =
1237             compat_alloc_user_space(sizeof(arg64));
1238         int err;
1239         u32 cp;
1240
1241         memset(&arg64, 0, sizeof(arg64));
1242         err = 0;
1243         err |=
1244             copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
1245                            sizeof(arg64.LUN_info));
1246         err |=
1247             copy_from_user(&arg64.Request, &arg32->Request,
1248                            sizeof(arg64.Request));
1249         err |=
1250             copy_from_user(&arg64.error_info, &arg32->error_info,
1251                            sizeof(arg64.error_info));
1252         err |= get_user(arg64.buf_size, &arg32->buf_size);
1253         err |= get_user(arg64.malloc_size, &arg32->malloc_size);
1254         err |= get_user(cp, &arg32->buf);
1255         arg64.buf = compat_ptr(cp);
1256         err |= copy_to_user(p, &arg64, sizeof(arg64));
1257
1258         if (err)
1259                 return -EFAULT;
1260
1261         err = do_ioctl(bdev, mode, CCISS_BIG_PASSTHRU, (unsigned long)p);
1262         if (err)
1263                 return err;
1264         err |=
1265             copy_in_user(&arg32->error_info, &p->error_info,
1266                          sizeof(arg32->error_info));
1267         if (err)
1268                 return -EFAULT;
1269         return err;
1270 }
1271 #endif
1272
1273 static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1274 {
1275         drive_info_struct *drv = get_drv(bdev->bd_disk);
1276
1277         if (!drv->cylinders)
1278                 return -ENXIO;
1279
1280         geo->heads = drv->heads;
1281         geo->sectors = drv->sectors;
1282         geo->cylinders = drv->cylinders;
1283         return 0;
1284 }
1285
1286 static void check_ioctl_unit_attention(ctlr_info_t *h, CommandList_struct *c)
1287 {
1288         if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
1289                         c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
1290                 (void)check_for_unit_attention(h, c);
1291 }
1292
1293 static int cciss_getpciinfo(ctlr_info_t *h, void __user *argp)
1294 {
1295         cciss_pci_info_struct pciinfo;
1296
1297         if (!argp)
1298                 return -EINVAL;
1299         pciinfo.domain = pci_domain_nr(h->pdev->bus);
1300         pciinfo.bus = h->pdev->bus->number;
1301         pciinfo.dev_fn = h->pdev->devfn;
1302         pciinfo.board_id = h->board_id;
1303         if (copy_to_user(argp, &pciinfo, sizeof(cciss_pci_info_struct)))
1304                 return -EFAULT;
1305         return 0;
1306 }
1307
1308 static int cciss_getintinfo(ctlr_info_t *h, void __user *argp)
1309 {
1310         cciss_coalint_struct intinfo;
1311
1312         if (!argp)
1313                 return -EINVAL;
1314         intinfo.delay = readl(&h->cfgtable->HostWrite.CoalIntDelay);
1315         intinfo.count = readl(&h->cfgtable->HostWrite.CoalIntCount);
1316         if (copy_to_user
1317             (argp, &intinfo, sizeof(cciss_coalint_struct)))
1318                 return -EFAULT;
1319         return 0;
1320 }
1321
1322 static int cciss_setintinfo(ctlr_info_t *h, void __user *argp)
1323 {
1324         cciss_coalint_struct intinfo;
1325         unsigned long flags;
1326         int i;
1327
1328         if (!argp)
1329                 return -EINVAL;
1330         if (!capable(CAP_SYS_ADMIN))
1331                 return -EPERM;
1332         if (copy_from_user(&intinfo, argp, sizeof(intinfo)))
1333                 return -EFAULT;
1334         if ((intinfo.delay == 0) && (intinfo.count == 0))
1335                 return -EINVAL;
1336         spin_lock_irqsave(&h->lock, flags);
1337         /* Update the field, and then ring the doorbell */
1338         writel(intinfo.delay, &(h->cfgtable->HostWrite.CoalIntDelay));
1339         writel(intinfo.count, &(h->cfgtable->HostWrite.CoalIntCount));
1340         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
1341
1342         for (i = 0; i < MAX_IOCTL_CONFIG_WAIT; i++) {
1343                 if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
1344                         break;
1345                 udelay(1000); /* delay and try again */
1346         }
1347         spin_unlock_irqrestore(&h->lock, flags);
1348         if (i >= MAX_IOCTL_CONFIG_WAIT)
1349                 return -EAGAIN;
1350         return 0;
1351 }
1352
1353 static int cciss_getnodename(ctlr_info_t *h, void __user *argp)
1354 {
1355         NodeName_type NodeName;
1356         int i;
1357
1358         if (!argp)
1359                 return -EINVAL;
1360         for (i = 0; i < 16; i++)
1361                 NodeName[i] = readb(&h->cfgtable->ServerName[i]);
1362         if (copy_to_user(argp, NodeName, sizeof(NodeName_type)))
1363                 return -EFAULT;
1364         return 0;
1365 }
1366
1367 static int cciss_setnodename(ctlr_info_t *h, void __user *argp)
1368 {
1369         NodeName_type NodeName;
1370         unsigned long flags;
1371         int i;
1372
1373         if (!argp)
1374                 return -EINVAL;
1375         if (!capable(CAP_SYS_ADMIN))
1376                 return -EPERM;
1377         if (copy_from_user(NodeName, argp, sizeof(NodeName_type)))
1378                 return -EFAULT;
1379         spin_lock_irqsave(&h->lock, flags);
1380         /* Update the field, and then ring the doorbell */
1381         for (i = 0; i < 16; i++)
1382                 writeb(NodeName[i], &h->cfgtable->ServerName[i]);
1383         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
1384         for (i = 0; i < MAX_IOCTL_CONFIG_WAIT; i++) {
1385                 if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
1386                         break;
1387                 udelay(1000); /* delay and try again */
1388         }
1389         spin_unlock_irqrestore(&h->lock, flags);
1390         if (i >= MAX_IOCTL_CONFIG_WAIT)
1391                 return -EAGAIN;
1392         return 0;
1393 }
1394
1395 static int cciss_getheartbeat(ctlr_info_t *h, void __user *argp)
1396 {
1397         Heartbeat_type heartbeat;
1398
1399         if (!argp)
1400                 return -EINVAL;
1401         heartbeat = readl(&h->cfgtable->HeartBeat);
1402         if (copy_to_user(argp, &heartbeat, sizeof(Heartbeat_type)))
1403                 return -EFAULT;
1404         return 0;
1405 }
1406
1407 static int cciss_getbustypes(ctlr_info_t *h, void __user *argp)
1408 {
1409         BusTypes_type BusTypes;
1410
1411         if (!argp)
1412                 return -EINVAL;
1413         BusTypes = readl(&h->cfgtable->BusTypes);
1414         if (copy_to_user(argp, &BusTypes, sizeof(BusTypes_type)))
1415                 return -EFAULT;
1416         return 0;
1417 }
1418
1419 static int cciss_getfirmver(ctlr_info_t *h, void __user *argp)
1420 {
1421         FirmwareVer_type firmware;
1422
1423         if (!argp)
1424                 return -EINVAL;
1425         memcpy(firmware, h->firm_ver, 4);
1426
1427         if (copy_to_user
1428             (argp, firmware, sizeof(FirmwareVer_type)))
1429                 return -EFAULT;
1430         return 0;
1431 }
1432
1433 static int cciss_getdrivver(ctlr_info_t *h, void __user *argp)
1434 {
1435         DriverVer_type DriverVer = DRIVER_VERSION;
1436
1437         if (!argp)
1438                 return -EINVAL;
1439         if (copy_to_user(argp, &DriverVer, sizeof(DriverVer_type)))
1440                 return -EFAULT;
1441         return 0;
1442 }
1443
1444 static int cciss_getluninfo(ctlr_info_t *h,
1445         struct gendisk *disk, void __user *argp)
1446 {
1447         LogvolInfo_struct luninfo;
1448         drive_info_struct *drv = get_drv(disk);
1449
1450         if (!argp)
1451                 return -EINVAL;
1452         memcpy(&luninfo.LunID, drv->LunID, sizeof(luninfo.LunID));
1453         luninfo.num_opens = drv->usage_count;
1454         luninfo.num_parts = 0;
1455         if (copy_to_user(argp, &luninfo, sizeof(LogvolInfo_struct)))
1456                 return -EFAULT;
1457         return 0;
1458 }
1459
1460 static int cciss_passthru(ctlr_info_t *h, void __user *argp)
1461 {
1462         IOCTL_Command_struct iocommand;
1463         CommandList_struct *c;
1464         char *buff = NULL;
1465         u64bit temp64;
1466         DECLARE_COMPLETION_ONSTACK(wait);
1467
1468         if (!argp)
1469                 return -EINVAL;
1470
1471         if (!capable(CAP_SYS_RAWIO))
1472                 return -EPERM;
1473
1474         if (copy_from_user
1475             (&iocommand, argp, sizeof(IOCTL_Command_struct)))
1476                 return -EFAULT;
1477         if ((iocommand.buf_size < 1) &&
1478             (iocommand.Request.Type.Direction != XFER_NONE)) {
1479                 return -EINVAL;
1480         }
1481         if (iocommand.buf_size > 0) {
1482                 buff = kmalloc(iocommand.buf_size, GFP_KERNEL);
1483                 if (buff == NULL)
1484                         return -EFAULT;
1485         }
1486         if (iocommand.Request.Type.Direction == XFER_WRITE) {
1487                 /* Copy the data into the buffer we created */
1488                 if (copy_from_user(buff, iocommand.buf, iocommand.buf_size)) {
1489                         kfree(buff);
1490                         return -EFAULT;
1491                 }
1492         } else {
1493                 memset(buff, 0, iocommand.buf_size);
1494         }
1495         c = cmd_special_alloc(h);
1496         if (!c) {
1497                 kfree(buff);
1498                 return -ENOMEM;
1499         }
1500         /* Fill in the command type */
1501         c->cmd_type = CMD_IOCTL_PEND;
1502         /* Fill in Command Header */
1503         c->Header.ReplyQueue = 0;   /* unused in simple mode */
1504         if (iocommand.buf_size > 0) { /* buffer to fill */
1505                 c->Header.SGList = 1;
1506                 c->Header.SGTotal = 1;
1507         } else { /* no buffers to fill */
1508                 c->Header.SGList = 0;
1509                 c->Header.SGTotal = 0;
1510         }
1511         c->Header.LUN = iocommand.LUN_info;
1512         /* use the kernel address the cmd block for tag */
1513         c->Header.Tag.lower = c->busaddr;
1514
1515         /* Fill in Request block */
1516         c->Request = iocommand.Request;
1517
1518         /* Fill in the scatter gather information */
1519         if (iocommand.buf_size > 0) {
1520                 temp64.val = pci_map_single(h->pdev, buff,
1521                         iocommand.buf_size, PCI_DMA_BIDIRECTIONAL);
1522                 c->SG[0].Addr.lower = temp64.val32.lower;
1523                 c->SG[0].Addr.upper = temp64.val32.upper;
1524                 c->SG[0].Len = iocommand.buf_size;
1525                 c->SG[0].Ext = 0;  /* we are not chaining */
1526         }
1527         c->waiting = &wait;
1528
1529         enqueue_cmd_and_start_io(h, c);
1530         wait_for_completion(&wait);
1531
1532         /* unlock the buffers from DMA */
1533         temp64.val32.lower = c->SG[0].Addr.lower;
1534         temp64.val32.upper = c->SG[0].Addr.upper;
1535         pci_unmap_single(h->pdev, (dma_addr_t) temp64.val, iocommand.buf_size,
1536                          PCI_DMA_BIDIRECTIONAL);
1537         check_ioctl_unit_attention(h, c);
1538
1539         /* Copy the error information out */
1540         iocommand.error_info = *(c->err_info);
1541         if (copy_to_user(argp, &iocommand, sizeof(IOCTL_Command_struct))) {
1542                 kfree(buff);
1543                 cmd_special_free(h, c);
1544                 return -EFAULT;
1545         }
1546
1547         if (iocommand.Request.Type.Direction == XFER_READ) {
1548                 /* Copy the data out of the buffer we created */
1549                 if (copy_to_user(iocommand.buf, buff, iocommand.buf_size)) {
1550                         kfree(buff);
1551                         cmd_special_free(h, c);
1552                         return -EFAULT;
1553                 }
1554         }
1555         kfree(buff);
1556         cmd_special_free(h, c);
1557         return 0;
1558 }
1559
1560 static int cciss_bigpassthru(ctlr_info_t *h, void __user *argp)
1561 {
1562         BIG_IOCTL_Command_struct *ioc;
1563         CommandList_struct *c;
1564         unsigned char **buff = NULL;
1565         int *buff_size = NULL;
1566         u64bit temp64;
1567         BYTE sg_used = 0;
1568         int status = 0;
1569         int i;
1570         DECLARE_COMPLETION_ONSTACK(wait);
1571         __u32 left;
1572         __u32 sz;
1573         BYTE __user *data_ptr;
1574
1575         if (!argp)
1576                 return -EINVAL;
1577         if (!capable(CAP_SYS_RAWIO))
1578                 return -EPERM;
1579         ioc = kmalloc(sizeof(*ioc), GFP_KERNEL);
1580         if (!ioc) {
1581                 status = -ENOMEM;
1582                 goto cleanup1;
1583         }
1584         if (copy_from_user(ioc, argp, sizeof(*ioc))) {
1585                 status = -EFAULT;
1586                 goto cleanup1;
1587         }
1588         if ((ioc->buf_size < 1) &&
1589             (ioc->Request.Type.Direction != XFER_NONE)) {
1590                 status = -EINVAL;
1591                 goto cleanup1;
1592         }
1593         /* Check kmalloc limits  using all SGs */
1594         if (ioc->malloc_size > MAX_KMALLOC_SIZE) {
1595                 status = -EINVAL;
1596                 goto cleanup1;
1597         }
1598         if (ioc->buf_size > ioc->malloc_size * MAXSGENTRIES) {
1599                 status = -EINVAL;
1600                 goto cleanup1;
1601         }
1602         buff = kzalloc(MAXSGENTRIES * sizeof(char *), GFP_KERNEL);
1603         if (!buff) {
1604                 status = -ENOMEM;
1605                 goto cleanup1;
1606         }
1607         buff_size = kmalloc(MAXSGENTRIES * sizeof(int), GFP_KERNEL);
1608         if (!buff_size) {
1609                 status = -ENOMEM;
1610                 goto cleanup1;
1611         }
1612         left = ioc->buf_size;
1613         data_ptr = ioc->buf;
1614         while (left) {
1615                 sz = (left > ioc->malloc_size) ? ioc->malloc_size : left;
1616                 buff_size[sg_used] = sz;
1617                 buff[sg_used] = kmalloc(sz, GFP_KERNEL);
1618                 if (buff[sg_used] == NULL) {
1619                         status = -ENOMEM;
1620                         goto cleanup1;
1621                 }
1622                 if (ioc->Request.Type.Direction == XFER_WRITE) {
1623                         if (copy_from_user(buff[sg_used], data_ptr, sz)) {
1624                                 status = -EFAULT;
1625                                 goto cleanup1;
1626                         }
1627                 } else {
1628                         memset(buff[sg_used], 0, sz);
1629                 }
1630                 left -= sz;
1631                 data_ptr += sz;
1632                 sg_used++;
1633         }
1634         c = cmd_special_alloc(h);
1635         if (!c) {
1636                 status = -ENOMEM;
1637                 goto cleanup1;
1638         }
1639         c->cmd_type = CMD_IOCTL_PEND;
1640         c->Header.ReplyQueue = 0;
1641         c->Header.SGList = sg_used;
1642         c->Header.SGTotal = sg_used;
1643         c->Header.LUN = ioc->LUN_info;
1644         c->Header.Tag.lower = c->busaddr;
1645
1646         c->Request = ioc->Request;
1647         for (i = 0; i < sg_used; i++) {
1648                 temp64.val = pci_map_single(h->pdev, buff[i], buff_size[i],
1649                                     PCI_DMA_BIDIRECTIONAL);
1650                 c->SG[i].Addr.lower = temp64.val32.lower;
1651                 c->SG[i].Addr.upper = temp64.val32.upper;
1652                 c->SG[i].Len = buff_size[i];
1653                 c->SG[i].Ext = 0;       /* we are not chaining */
1654         }
1655         c->waiting = &wait;
1656         enqueue_cmd_and_start_io(h, c);
1657         wait_for_completion(&wait);
1658         /* unlock the buffers from DMA */
1659         for (i = 0; i < sg_used; i++) {
1660                 temp64.val32.lower = c->SG[i].Addr.lower;
1661                 temp64.val32.upper = c->SG[i].Addr.upper;
1662                 pci_unmap_single(h->pdev,
1663                         (dma_addr_t) temp64.val, buff_size[i],
1664                         PCI_DMA_BIDIRECTIONAL);
1665         }
1666         check_ioctl_unit_attention(h, c);
1667         /* Copy the error information out */
1668         ioc->error_info = *(c->err_info);
1669         if (copy_to_user(argp, ioc, sizeof(*ioc))) {
1670                 cmd_special_free(h, c);
1671                 status = -EFAULT;
1672                 goto cleanup1;
1673         }
1674         if (ioc->Request.Type.Direction == XFER_READ) {
1675                 /* Copy the data out of the buffer we created */
1676                 BYTE __user *ptr = ioc->buf;
1677                 for (i = 0; i < sg_used; i++) {
1678                         if (copy_to_user(ptr, buff[i], buff_size[i])) {
1679                                 cmd_special_free(h, c);
1680                                 status = -EFAULT;
1681                                 goto cleanup1;
1682                         }
1683                         ptr += buff_size[i];
1684                 }
1685         }
1686         cmd_special_free(h, c);
1687         status = 0;
1688 cleanup1:
1689         if (buff) {
1690                 for (i = 0; i < sg_used; i++)
1691                         kfree(buff[i]);
1692                 kfree(buff);
1693         }
1694         kfree(buff_size);
1695         kfree(ioc);
1696         return status;
1697 }
1698
1699 static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
1700         unsigned int cmd, unsigned long arg)
1701 {
1702         struct gendisk *disk = bdev->bd_disk;
1703         ctlr_info_t *h = get_host(disk);
1704         void __user *argp = (void __user *)arg;
1705
1706         dev_dbg(&h->pdev->dev, "cciss_ioctl: Called with cmd=%x %lx\n",
1707                 cmd, arg);
1708         switch (cmd) {
1709         case CCISS_GETPCIINFO:
1710                 return cciss_getpciinfo(h, argp);
1711         case CCISS_GETINTINFO:
1712                 return cciss_getintinfo(h, argp);
1713         case CCISS_SETINTINFO:
1714                 return cciss_setintinfo(h, argp);
1715         case CCISS_GETNODENAME:
1716                 return cciss_getnodename(h, argp);
1717         case CCISS_SETNODENAME:
1718                 return cciss_setnodename(h, argp);
1719         case CCISS_GETHEARTBEAT:
1720                 return cciss_getheartbeat(h, argp);
1721         case CCISS_GETBUSTYPES:
1722                 return cciss_getbustypes(h, argp);
1723         case CCISS_GETFIRMVER:
1724                 return cciss_getfirmver(h, argp);
1725         case CCISS_GETDRIVVER:
1726                 return cciss_getdrivver(h, argp);
1727         case CCISS_DEREGDISK:
1728         case CCISS_REGNEWD:
1729         case CCISS_REVALIDVOLS:
1730                 return rebuild_lun_table(h, 0, 1);
1731         case CCISS_GETLUNINFO:
1732                 return cciss_getluninfo(h, disk, argp);
1733         case CCISS_PASSTHRU:
1734                 return cciss_passthru(h, argp);
1735         case CCISS_BIG_PASSTHRU:
1736                 return cciss_bigpassthru(h, argp);
1737
1738         /* scsi_cmd_blk_ioctl handles these, below, though some are not */
1739         /* very meaningful for cciss.  SG_IO is the main one people want. */
1740
1741         case SG_GET_VERSION_NUM:
1742         case SG_SET_TIMEOUT:
1743         case SG_GET_TIMEOUT:
1744         case SG_GET_RESERVED_SIZE:
1745         case SG_SET_RESERVED_SIZE:
1746         case SG_EMULATED_HOST:
1747         case SG_IO:
1748         case SCSI_IOCTL_SEND_COMMAND:
1749                 return scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
1750
1751         /* scsi_cmd_blk_ioctl would normally handle these, below, but */
1752         /* they aren't a good fit for cciss, as CD-ROMs are */
1753         /* not supported, and we don't have any bus/target/lun */
1754         /* which we present to the kernel. */
1755
1756         case CDROM_SEND_PACKET:
1757         case CDROMCLOSETRAY:
1758         case CDROMEJECT:
1759         case SCSI_IOCTL_GET_IDLUN:
1760         case SCSI_IOCTL_GET_BUS_NUMBER:
1761         default:
1762                 return -ENOTTY;
1763         }
1764 }
1765
1766 static void cciss_check_queues(ctlr_info_t *h)
1767 {
1768         int start_queue = h->next_to_run;
1769         int i;
1770
1771         /* check to see if we have maxed out the number of commands that can
1772          * be placed on the queue.  If so then exit.  We do this check here
1773          * in case the interrupt we serviced was from an ioctl and did not
1774          * free any new commands.
1775          */
1776         if ((find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds)) == h->nr_cmds)
1777                 return;
1778
1779         /* We have room on the queue for more commands.  Now we need to queue
1780          * them up.  We will also keep track of the next queue to run so
1781          * that every queue gets a chance to be started first.
1782          */
1783         for (i = 0; i < h->highest_lun + 1; i++) {
1784                 int curr_queue = (start_queue + i) % (h->highest_lun + 1);
1785                 /* make sure the disk has been added and the drive is real
1786                  * because this can be called from the middle of init_one.
1787                  */
1788                 if (!h->drv[curr_queue])
1789                         continue;
1790                 if (!(h->drv[curr_queue]->queue) ||
1791                         !(h->drv[curr_queue]->heads))
1792                         continue;
1793                 blk_start_queue(h->gendisk[curr_queue]->queue);
1794
1795                 /* check to see if we have maxed out the number of commands
1796                  * that can be placed on the queue.
1797                  */
1798                 if ((find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds)) == h->nr_cmds) {
1799                         if (curr_queue == start_queue) {
1800                                 h->next_to_run =
1801                                     (start_queue + 1) % (h->highest_lun + 1);
1802                                 break;
1803                         } else {
1804                                 h->next_to_run = curr_queue;
1805                                 break;
1806                         }
1807                 }
1808         }
1809 }
1810
1811 static void cciss_softirq_done(struct request *rq)
1812 {
1813         CommandList_struct *c = rq->completion_data;
1814         ctlr_info_t *h = hba[c->ctlr];
1815         SGDescriptor_struct *curr_sg = c->SG;
1816         u64bit temp64;
1817         unsigned long flags;
1818         int i, ddir;
1819         int sg_index = 0;
1820
1821         if (c->Request.Type.Direction == XFER_READ)
1822                 ddir = PCI_DMA_FROMDEVICE;
1823         else
1824                 ddir = PCI_DMA_TODEVICE;
1825
1826         /* command did not need to be retried */
1827         /* unmap the DMA mapping for all the scatter gather elements */
1828         for (i = 0; i < c->Header.SGList; i++) {
1829                 if (curr_sg[sg_index].Ext == CCISS_SG_CHAIN) {
1830                         cciss_unmap_sg_chain_block(h, c);
1831                         /* Point to the next block */
1832                         curr_sg = h->cmd_sg_list[c->cmdindex];
1833                         sg_index = 0;
1834                 }
1835                 temp64.val32.lower = curr_sg[sg_index].Addr.lower;
1836                 temp64.val32.upper = curr_sg[sg_index].Addr.upper;
1837                 pci_unmap_page(h->pdev, temp64.val, curr_sg[sg_index].Len,
1838                                 ddir);
1839                 ++sg_index;
1840         }
1841
1842         dev_dbg(&h->pdev->dev, "Done with %p\n", rq);
1843
1844         /* set the residual count for pc requests */
1845         if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
1846                 rq->resid_len = c->err_info->ResidualCnt;
1847
1848         blk_end_request_all(rq, (rq->errors == 0) ? 0 : -EIO);
1849
1850         spin_lock_irqsave(&h->lock, flags);
1851         cmd_free(h, c);
1852         cciss_check_queues(h);
1853         spin_unlock_irqrestore(&h->lock, flags);
1854 }
1855
1856 static inline void log_unit_to_scsi3addr(ctlr_info_t *h,
1857         unsigned char scsi3addr[], uint32_t log_unit)
1858 {
1859         memcpy(scsi3addr, h->drv[log_unit]->LunID,
1860                 sizeof(h->drv[log_unit]->LunID));
1861 }
1862
1863 /* This function gets the SCSI vendor, model, and revision of a logical drive
1864  * via the inquiry page 0.  Model, vendor, and rev are set to empty strings if
1865  * they cannot be read.
1866  */
1867 static void cciss_get_device_descr(ctlr_info_t *h, int logvol,
1868                                    char *vendor, char *model, char *rev)
1869 {
1870         int rc;
1871         InquiryData_struct *inq_buf;
1872         unsigned char scsi3addr[8];
1873
1874         *vendor = '\0';
1875         *model = '\0';
1876         *rev = '\0';
1877
1878         inq_buf = kzalloc(sizeof(InquiryData_struct), GFP_KERNEL);
1879         if (!inq_buf)
1880                 return;
1881
1882         log_unit_to_scsi3addr(h, scsi3addr, logvol);
1883         rc = sendcmd_withirq(h, CISS_INQUIRY, inq_buf, sizeof(*inq_buf), 0,
1884                         scsi3addr, TYPE_CMD);
1885         if (rc == IO_OK) {
1886                 memcpy(vendor, &inq_buf->data_byte[8], VENDOR_LEN);
1887                 vendor[VENDOR_LEN] = '\0';
1888                 memcpy(model, &inq_buf->data_byte[16], MODEL_LEN);
1889                 model[MODEL_LEN] = '\0';
1890                 memcpy(rev, &inq_buf->data_byte[32], REV_LEN);
1891                 rev[REV_LEN] = '\0';
1892         }
1893
1894         kfree(inq_buf);
1895         return;
1896 }
1897
1898 /* This function gets the serial number of a logical drive via
1899  * inquiry page 0x83.  Serial no. is 16 bytes.  If the serial
1900  * number cannot be had, for whatever reason, 16 bytes of 0xff
1901  * are returned instead.
1902  */
1903 static void cciss_get_serial_no(ctlr_info_t *h, int logvol,
1904                                 unsigned char *serial_no, int buflen)
1905 {
1906 #define PAGE_83_INQ_BYTES 64
1907         int rc;
1908         unsigned char *buf;
1909         unsigned char scsi3addr[8];
1910
1911         if (buflen > 16)
1912                 buflen = 16;
1913         memset(serial_no, 0xff, buflen);
1914         buf = kzalloc(PAGE_83_INQ_BYTES, GFP_KERNEL);
1915         if (!buf)
1916                 return;
1917         memset(serial_no, 0, buflen);
1918         log_unit_to_scsi3addr(h, scsi3addr, logvol);
1919         rc = sendcmd_withirq(h, CISS_INQUIRY, buf,
1920                 PAGE_83_INQ_BYTES, 0x83, scsi3addr, TYPE_CMD);
1921         if (rc == IO_OK)
1922                 memcpy(serial_no, &buf[8], buflen);
1923         kfree(buf);
1924         return;
1925 }
1926
1927 /*
1928  * cciss_add_disk sets up the block device queue for a logical drive
1929  */
1930 static int cciss_add_disk(ctlr_info_t *h, struct gendisk *disk,
1931                                 int drv_index)
1932 {
1933         disk->queue = blk_init_queue(do_cciss_request, &h->lock);
1934         if (!disk->queue)
1935                 goto init_queue_failure;
1936         sprintf(disk->disk_name, "cciss/c%dd%d", h->ctlr, drv_index);
1937         disk->major = h->major;
1938         disk->first_minor = drv_index << NWD_SHIFT;
1939         disk->fops = &cciss_fops;
1940         if (cciss_create_ld_sysfs_entry(h, drv_index))
1941                 goto cleanup_queue;
1942         disk->private_data = h->drv[drv_index];
1943         disk->driverfs_dev = &h->drv[drv_index]->dev;
1944
1945         /* Set up queue information */
1946         blk_queue_bounce_limit(disk->queue, h->pdev->dma_mask);
1947
1948         /* This is a hardware imposed limit. */
1949         blk_queue_max_segments(disk->queue, h->maxsgentries);
1950
1951         blk_queue_max_hw_sectors(disk->queue, h->cciss_max_sectors);
1952
1953         blk_queue_softirq_done(disk->queue, cciss_softirq_done);
1954
1955         disk->queue->queuedata = h;
1956
1957         blk_queue_logical_block_size(disk->queue,
1958                                      h->drv[drv_index]->block_size);
1959
1960         /* Make sure all queue data is written out before */
1961         /* setting h->drv[drv_index]->queue, as setting this */
1962         /* allows the interrupt handler to start the queue */
1963         wmb();
1964         h->drv[drv_index]->queue = disk->queue;
1965         add_disk(disk);
1966         return 0;
1967
1968 cleanup_queue:
1969         blk_cleanup_queue(disk->queue);
1970         disk->queue = NULL;
1971 init_queue_failure:
1972         return -1;
1973 }
1974
1975 /* This function will check the usage_count of the drive to be updated/added.
1976  * If the usage_count is zero and it is a heretofore unknown drive, or,
1977  * the drive's capacity, geometry, or serial number has changed,
1978  * then the drive information will be updated and the disk will be
1979  * re-registered with the kernel.  If these conditions don't hold,
1980  * then it will be left alone for the next reboot.  The exception to this
1981  * is disk 0 which will always be left registered with the kernel since it
1982  * is also the controller node.  Any changes to disk 0 will show up on
1983  * the next reboot.
1984  */
1985 static void cciss_update_drive_info(ctlr_info_t *h, int drv_index,
1986         int first_time, int via_ioctl)
1987 {
1988         struct gendisk *disk;
1989         InquiryData_struct *inq_buff = NULL;
1990         unsigned int block_size;
1991         sector_t total_size;
1992         unsigned long flags = 0;
1993         int ret = 0;
1994         drive_info_struct *drvinfo;
1995
1996         /* Get information about the disk and modify the driver structure */
1997         inq_buff = kmalloc(sizeof(InquiryData_struct), GFP_KERNEL);
1998         drvinfo = kzalloc(sizeof(*drvinfo), GFP_KERNEL);
1999         if (inq_buff == NULL || drvinfo == NULL)
2000                 goto mem_msg;
2001
2002         /* testing to see if 16-byte CDBs are already being used */
2003         if (h->cciss_read == CCISS_READ_16) {
2004                 cciss_read_capacity_16(h, drv_index,
2005                         &total_size, &block_size);
2006
2007         } else {
2008                 cciss_read_capacity(h, drv_index, &total_size, &block_size);
2009                 /* if read_capacity returns all F's this volume is >2TB */
2010                 /* in size so we switch to 16-byte CDB's for all */
2011                 /* read/write ops */
2012                 if (total_size == 0xFFFFFFFFULL) {
2013                         cciss_read_capacity_16(h, drv_index,
2014                         &total_size, &block_size);
2015                         h->cciss_read = CCISS_READ_16;
2016                         h->cciss_write = CCISS_WRITE_16;
2017                 } else {
2018                         h->cciss_read = CCISS_READ_10;
2019                         h->cciss_write = CCISS_WRITE_10;
2020                 }
2021         }
2022
2023         cciss_geometry_inquiry(h, drv_index, total_size, block_size,
2024                                inq_buff, drvinfo);
2025         drvinfo->block_size = block_size;
2026         drvinfo->nr_blocks = total_size + 1;
2027
2028         cciss_get_device_descr(h, drv_index, drvinfo->vendor,
2029                                 drvinfo->model, drvinfo->rev);
2030         cciss_get_serial_no(h, drv_index, drvinfo->serial_no,
2031                         sizeof(drvinfo->serial_no));
2032         /* Save the lunid in case we deregister the disk, below. */
2033         memcpy(drvinfo->LunID, h->drv[drv_index]->LunID,
2034                 sizeof(drvinfo->LunID));
2035
2036         /* Is it the same disk we already know, and nothing's changed? */
2037         if (h->drv[drv_index]->raid_level != -1 &&
2038                 ((memcmp(drvinfo->serial_no,
2039                                 h->drv[drv_index]->serial_no, 16) == 0) &&
2040                 drvinfo->block_size == h->drv[drv_index]->block_size &&
2041                 drvinfo->nr_blocks == h->drv[drv_index]->nr_blocks &&
2042                 drvinfo->heads == h->drv[drv_index]->heads &&
2043                 drvinfo->sectors == h->drv[drv_index]->sectors &&
2044                 drvinfo->cylinders == h->drv[drv_index]->cylinders))
2045                         /* The disk is unchanged, nothing to update */
2046                         goto freeret;
2047
2048         /* If we get here it's not the same disk, or something's changed,
2049          * so we need to * deregister it, and re-register it, if it's not
2050          * in use.
2051          * If the disk already exists then deregister it before proceeding
2052          * (unless it's the first disk (for the controller node).
2053          */
2054         if (h->drv[drv_index]->raid_level != -1 && drv_index != 0) {
2055                 dev_warn(&h->pdev->dev, "disk %d has changed.\n", drv_index);
2056                 spin_lock_irqsave(&h->lock, flags);
2057                 h->drv[drv_index]->busy_configuring = 1;
2058                 spin_unlock_irqrestore(&h->lock, flags);
2059
2060                 /* deregister_disk sets h->drv[drv_index]->queue = NULL
2061                  * which keeps the interrupt handler from starting
2062                  * the queue.
2063                  */
2064                 ret = deregister_disk(h, drv_index, 0, via_ioctl);
2065         }
2066
2067         /* If the disk is in use return */
2068         if (ret)
2069                 goto freeret;
2070
2071         /* Save the new information from cciss_geometry_inquiry
2072          * and serial number inquiry.  If the disk was deregistered
2073          * above, then h->drv[drv_index] will be NULL.
2074          */
2075         if (h->drv[drv_index] == NULL) {
2076                 drvinfo->device_initialized = 0;
2077                 h->drv[drv_index] = drvinfo;
2078                 drvinfo = NULL; /* so it won't be freed below. */
2079         } else {
2080                 /* special case for cxd0 */
2081                 h->drv[drv_index]->block_size = drvinfo->block_size;
2082                 h->drv[drv_index]->nr_blocks = drvinfo->nr_blocks;
2083                 h->drv[drv_index]->heads = drvinfo->heads;
2084                 h->drv[drv_index]->sectors = drvinfo->sectors;
2085                 h->drv[drv_index]->cylinders = drvinfo->cylinders;
2086                 h->drv[drv_index]->raid_level = drvinfo->raid_level;
2087                 memcpy(h->drv[drv_index]->serial_no, drvinfo->serial_no, 16);
2088                 memcpy(h->drv[drv_index]->vendor, drvinfo->vendor,
2089                         VENDOR_LEN + 1);
2090                 memcpy(h->drv[drv_index]->model, drvinfo->model, MODEL_LEN + 1);
2091                 memcpy(h->drv[drv_index]->rev, drvinfo->rev, REV_LEN + 1);
2092         }
2093
2094         ++h->num_luns;
2095         disk = h->gendisk[drv_index];
2096         set_capacity(disk, h->drv[drv_index]->nr_blocks);
2097
2098         /* If it's not disk 0 (drv_index != 0)
2099          * or if it was disk 0, but there was previously
2100          * no actual corresponding configured logical drive
2101          * (raid_leve == -1) then we want to update the
2102          * logical drive's information.
2103          */
2104         if (drv_index || first_time) {
2105                 if (cciss_add_disk(h, disk, drv_index) != 0) {
2106                         cciss_free_gendisk(h, drv_index);
2107                         cciss_free_drive_info(h, drv_index);
2108                         dev_warn(&h->pdev->dev, "could not update disk %d\n",
2109                                 drv_index);
2110                         --h->num_luns;
2111                 }
2112         }
2113
2114 freeret:
2115         kfree(inq_buff);
2116         kfree(drvinfo);
2117         return;
2118 mem_msg:
2119         dev_err(&h->pdev->dev, "out of memory\n");
2120         goto freeret;
2121 }
2122
2123 /* This function will find the first index of the controllers drive array
2124  * that has a null drv pointer and allocate the drive info struct and
2125  * will return that index   This is where new drives will be added.
2126  * If the index to be returned is greater than the highest_lun index for
2127  * the controller then highest_lun is set * to this new index.
2128  * If there are no available indexes or if tha allocation fails, then -1
2129  * is returned.  * "controller_node" is used to know if this is a real
2130  * logical drive, or just the controller node, which determines if this
2131  * counts towards highest_lun.
2132  */
2133 static int cciss_alloc_drive_info(ctlr_info_t *h, int controller_node)
2134 {
2135         int i;
2136         drive_info_struct *drv;
2137
2138         /* Search for an empty slot for our drive info */
2139         for (i = 0; i < CISS_MAX_LUN; i++) {
2140
2141                 /* if not cxd0 case, and it's occupied, skip it. */
2142                 if (h->drv[i] && i != 0)
2143                         continue;
2144                 /*
2145                  * If it's cxd0 case, and drv is alloc'ed already, and a
2146                  * disk is configured there, skip it.
2147                  */
2148                 if (i == 0 && h->drv[i] && h->drv[i]->raid_level != -1)
2149                         continue;
2150
2151                 /*
2152                  * We've found an empty slot.  Update highest_lun
2153                  * provided this isn't just the fake cxd0 controller node.
2154                  */
2155                 if (i > h->highest_lun && !controller_node)
2156                         h->highest_lun = i;
2157
2158                 /* If adding a real disk at cxd0, and it's already alloc'ed */
2159                 if (i == 0 && h->drv[i] != NULL)
2160                         return i;
2161
2162                 /*
2163                  * Found an empty slot, not already alloc'ed.  Allocate it.
2164                  * Mark it with raid_level == -1, so we know it's new later on.
2165                  */
2166                 drv = kzalloc(sizeof(*drv), GFP_KERNEL);
2167                 if (!drv)
2168                         return -1;
2169                 drv->raid_level = -1; /* so we know it's new */
2170                 h->drv[i] = drv;
2171                 return i;
2172         }
2173         return -1;
2174 }
2175
2176 static void cciss_free_drive_info(ctlr_info_t *h, int drv_index)
2177 {
2178         kfree(h->drv[drv_index]);
2179         h->drv[drv_index] = NULL;
2180 }
2181
2182 static void cciss_free_gendisk(ctlr_info_t *h, int drv_index)
2183 {
2184         put_disk(h->gendisk[drv_index]);
2185         h->gendisk[drv_index] = NULL;
2186 }
2187
2188 /* cciss_add_gendisk finds a free hba[]->drv structure
2189  * and allocates a gendisk if needed, and sets the lunid
2190  * in the drvinfo structure.   It returns the index into
2191  * the ->drv[] array, or -1 if none are free.
2192  * is_controller_node indicates whether highest_lun should
2193  * count this disk, or if it's only being added to provide
2194  * a means to talk to the controller in case no logical
2195  * drives have yet been configured.
2196  */
2197 static int cciss_add_gendisk(ctlr_info_t *h, unsigned char lunid[],
2198         int controller_node)
2199 {
2200         int drv_index;
2201
2202         drv_index = cciss_alloc_drive_info(h, controller_node);
2203         if (drv_index == -1)
2204                 return -1;
2205
2206         /*Check if the gendisk needs to be allocated */
2207         if (!h->gendisk[drv_index]) {
2208                 h->gendisk[drv_index] =
2209                         alloc_disk(1 << NWD_SHIFT);
2210                 if (!h->gendisk[drv_index]) {
2211                         dev_err(&h->pdev->dev,
2212                                 "could not allocate a new disk %d\n",
2213                                 drv_index);
2214                         goto err_free_drive_info;
2215                 }
2216         }
2217         memcpy(h->drv[drv_index]->LunID, lunid,
2218                 sizeof(h->drv[drv_index]->LunID));
2219         if (cciss_create_ld_sysfs_entry(h, drv_index))
2220                 goto err_free_disk;
2221         /* Don't need to mark this busy because nobody */
2222         /* else knows about this disk yet to contend */
2223         /* for access to it. */
2224         h->drv[drv_index]->busy_configuring = 0;
2225         wmb();
2226         return drv_index;
2227
2228 err_free_disk:
2229         cciss_free_gendisk(h, drv_index);
2230 err_free_drive_info:
2231         cciss_free_drive_info(h, drv_index);
2232         return -1;
2233 }
2234
2235 /* This is for the special case of a controller which
2236  * has no logical drives.  In this case, we still need
2237  * to register a disk so the controller can be accessed
2238  * by the Array Config Utility.
2239  */
2240 static void cciss_add_controller_node(ctlr_info_t *h)
2241 {
2242         struct gendisk *disk;
2243         int drv_index;
2244
2245         if (h->gendisk[0] != NULL) /* already did this? Then bail. */
2246                 return;
2247
2248         drv_index = cciss_add_gendisk(h, CTLR_LUNID, 1);
2249         if (drv_index == -1)
2250                 goto error;
2251         h->drv[drv_index]->block_size = 512;
2252         h->drv[drv_index]->nr_blocks = 0;
2253         h->drv[drv_index]->heads = 0;
2254         h->drv[drv_index]->sectors = 0;
2255         h->drv[drv_index]->cylinders = 0;
2256         h->drv[drv_index]->raid_level = -1;
2257         memset(h->drv[drv_index]->serial_no, 0, 16);
2258         disk = h->gendisk[drv_index];
2259         if (cciss_add_disk(h, disk, drv_index) == 0)
2260                 return;
2261         cciss_free_gendisk(h, drv_index);
2262         cciss_free_drive_info(h, drv_index);
2263 error:
2264         dev_warn(&h->pdev->dev, "could not add disk 0.\n");
2265         return;
2266 }
2267
2268 /* This function will add and remove logical drives from the Logical
2269  * drive array of the controller and maintain persistency of ordering
2270  * so that mount points are preserved until the next reboot.  This allows
2271  * for the removal of logical drives in the middle of the drive array
2272  * without a re-ordering of those drives.
2273  * INPUT
2274  * h            = The controller to perform the operations on
2275  */
2276 static int rebuild_lun_table(ctlr_info_t *h, int first_time,
2277         int via_ioctl)
2278 {
2279         int num_luns;
2280         ReportLunData_struct *ld_buff = NULL;
2281         int return_code;
2282         int listlength = 0;
2283         int i;
2284         int drv_found;
2285         int drv_index = 0;
2286         unsigned char lunid[8] = CTLR_LUNID;
2287         unsigned long flags;
2288
2289         if (!capable(CAP_SYS_RAWIO))
2290                 return -EPERM;
2291
2292         /* Set busy_configuring flag for this operation */
2293         spin_lock_irqsave(&h->lock, flags);
2294         if (h->busy_configuring) {
2295                 spin_unlock_irqrestore(&h->lock, flags);
2296                 return -EBUSY;
2297         }
2298         h->busy_configuring = 1;
2299         spin_unlock_irqrestore(&h->lock, flags);
2300
2301         ld_buff = kzalloc(sizeof(ReportLunData_struct), GFP_KERNEL);
2302         if (ld_buff == NULL)
2303                 goto mem_msg;
2304
2305         return_code = sendcmd_withirq(h, CISS_REPORT_LOG, ld_buff,
2306                                       sizeof(ReportLunData_struct),
2307                                       0, CTLR_LUNID, TYPE_CMD);
2308
2309         if (return_code == IO_OK)
2310                 listlength = be32_to_cpu(*(__be32 *) ld_buff->LUNListLength);
2311         else {  /* reading number of logical volumes failed */
2312                 dev_warn(&h->pdev->dev,
2313                         "report logical volume command failed\n");
2314                 listlength = 0;
2315                 goto freeret;
2316         }
2317
2318         num_luns = listlength / 8;      /* 8 bytes per entry */
2319         if (num_luns > CISS_MAX_LUN) {
2320                 num_luns = CISS_MAX_LUN;
2321                 dev_warn(&h->pdev->dev, "more luns configured"
2322                        " on controller than can be handled by"
2323                        " this driver.\n");
2324         }
2325
2326         if (num_luns == 0)
2327                 cciss_add_controller_node(h);
2328
2329         /* Compare controller drive array to driver's drive array
2330          * to see if any drives are missing on the controller due
2331          * to action of Array Config Utility (user deletes drive)
2332          * and deregister logical drives which have disappeared.
2333          */
2334         for (i = 0; i <= h->highest_lun; i++) {
2335                 int j;
2336                 drv_found = 0;
2337
2338                 /* skip holes in the array from already deleted drives */
2339                 if (h->drv[i] == NULL)
2340                         continue;
2341
2342                 for (j = 0; j < num_luns; j++) {
2343                         memcpy(lunid, &ld_buff->LUN[j][0], sizeof(lunid));
2344                         if (memcmp(h->drv[i]->LunID, lunid,
2345                                 sizeof(lunid)) == 0) {
2346                                 drv_found = 1;
2347                                 break;
2348                         }
2349                 }
2350                 if (!drv_found) {
2351                         /* Deregister it from the OS, it's gone. */
2352                         spin_lock_irqsave(&h->lock, flags);
2353                         h->drv[i]->busy_configuring = 1;
2354                         spin_unlock_irqrestore(&h->lock, flags);
2355                         return_code = deregister_disk(h, i, 1, via_ioctl);
2356                         if (h->drv[i] != NULL)
2357                                 h->drv[i]->busy_configuring = 0;
2358                 }
2359         }
2360
2361         /* Compare controller drive array to driver's drive array.
2362          * Check for updates in the drive information and any new drives
2363          * on the controller due to ACU adding logical drives, or changing
2364          * a logical drive's size, etc.  Reregister any new/changed drives
2365          */
2366         for (i = 0; i < num_luns; i++) {
2367                 int j;
2368
2369                 drv_found = 0;
2370
2371                 memcpy(lunid, &ld_buff->LUN[i][0], sizeof(lunid));
2372                 /* Find if the LUN is already in the drive array
2373                  * of the driver.  If so then update its info
2374                  * if not in use.  If it does not exist then find
2375                  * the first free index and add it.
2376                  */
2377                 for (j = 0; j <= h->highest_lun; j++) {
2378                         if (h->drv[j] != NULL &&
2379                                 memcmp(h->drv[j]->LunID, lunid,
2380                                         sizeof(h->drv[j]->LunID)) == 0) {
2381                                 drv_index = j;
2382                                 drv_found = 1;
2383                                 break;
2384                         }
2385                 }
2386
2387                 /* check if the drive was found already in the array */
2388                 if (!drv_found) {
2389                         drv_index = cciss_add_gendisk(h, lunid, 0);
2390                         if (drv_index == -1)
2391                                 goto freeret;
2392                 }
2393                 cciss_update_drive_info(h, drv_index, first_time, via_ioctl);
2394         }               /* end for */
2395
2396 freeret:
2397         kfree(ld_buff);
2398         h->busy_configuring = 0;
2399         /* We return -1 here to tell the ACU that we have registered/updated
2400          * all of the drives that we can and to keep it from calling us
2401          * additional times.
2402          */
2403         return -1;
2404 mem_msg:
2405         dev_err(&h->pdev->dev, "out of memory\n");
2406         h->busy_configuring = 0;
2407         goto freeret;
2408 }
2409
2410 static void cciss_clear_drive_info(drive_info_struct *drive_info)
2411 {
2412         /* zero out the disk size info */
2413         drive_info->nr_blocks = 0;
2414         drive_info->block_size = 0;
2415         drive_info->heads = 0;
2416         drive_info->sectors = 0;
2417         drive_info->cylinders = 0;
2418         drive_info->raid_level = -1;
2419         memset(drive_info->serial_no, 0, sizeof(drive_info->serial_no));
2420         memset(drive_info->model, 0, sizeof(drive_info->model));
2421         memset(drive_info->rev, 0, sizeof(drive_info->rev));
2422         memset(drive_info->vendor, 0, sizeof(drive_info->vendor));
2423         /*
2424          * don't clear the LUNID though, we need to remember which
2425          * one this one is.
2426          */
2427 }
2428
2429 /* This function will deregister the disk and it's queue from the
2430  * kernel.  It must be called with the controller lock held and the
2431  * drv structures busy_configuring flag set.  It's parameters are:
2432  *
2433  * disk = This is the disk to be deregistered
2434  * drv  = This is the drive_info_struct associated with the disk to be
2435  *        deregistered.  It contains information about the disk used
2436  *        by the driver.
2437  * clear_all = This flag determines whether or not the disk information
2438  *             is going to be completely cleared out and the highest_lun
2439  *             reset.  Sometimes we want to clear out information about
2440  *             the disk in preparation for re-adding it.  In this case
2441  *             the highest_lun should be left unchanged and the LunID
2442  *             should not be cleared.
2443  * via_ioctl
2444  *    This indicates whether we've reached this path via ioctl.
2445  *    This affects the maximum usage count allowed for c0d0 to be messed with.
2446  *    If this path is reached via ioctl(), then the max_usage_count will
2447  *    be 1, as the process calling ioctl() has got to have the device open.
2448  *    If we get here via sysfs, then the max usage count will be zero.
2449 */
2450 static int deregister_disk(ctlr_info_t *h, int drv_index,
2451                            int clear_all, int via_ioctl)
2452 {
2453         int i;
2454         struct gendisk *disk;
2455         drive_info_struct *drv;
2456         int recalculate_highest_lun;
2457
2458         if (!capable(CAP_SYS_RAWIO))
2459                 return -EPERM;
2460
2461         drv = h->drv[drv_index];
2462         disk = h->gendisk[drv_index];
2463
2464         /* make sure logical volume is NOT is use */
2465         if (clear_all || (h->gendisk[0] == disk)) {
2466                 if (drv->usage_count > via_ioctl)
2467                         return -EBUSY;
2468         } else if (drv->usage_count > 0)
2469                 return -EBUSY;
2470
2471         recalculate_highest_lun = (drv == h->drv[h->highest_lun]);
2472
2473         /* invalidate the devices and deregister the disk.  If it is disk
2474          * zero do not deregister it but just zero out it's values.  This
2475          * allows us to delete disk zero but keep the controller registered.
2476          */
2477         if (h->gendisk[0] != disk) {
2478                 struct request_queue *q = disk->queue;
2479                 if (disk->flags & GENHD_FL_UP) {
2480                         cciss_destroy_ld_sysfs_entry(h, drv_index, 0);
2481                         del_gendisk(disk);
2482                 }
2483                 if (q)
2484                         blk_cleanup_queue(q);
2485                 /* If clear_all is set then we are deleting the logical
2486                  * drive, not just refreshing its info.  For drives
2487                  * other than disk 0 we will call put_disk.  We do not
2488                  * do this for disk 0 as we need it to be able to
2489                  * configure the controller.
2490                  */
2491                 if (clear_all){
2492                         /* This isn't pretty, but we need to find the
2493                          * disk in our array and NULL our the pointer.
2494                          * This is so that we will call alloc_disk if
2495                          * this index is used again later.
2496                          */
2497                         for (i=0; i < CISS_MAX_LUN; i++){
2498                                 if (h->gendisk[i] == disk) {
2499                                         h->gendisk[i] = NULL;
2500                                         break;
2501                                 }
2502                         }
2503                         put_disk(disk);
2504                 }
2505         } else {
2506                 set_capacity(disk, 0);
2507                 cciss_clear_drive_info(drv);
2508         }
2509
2510         --h->num_luns;
2511
2512         /* if it was the last disk, find the new hightest lun */
2513         if (clear_all && recalculate_highest_lun) {
2514                 int newhighest = -1;
2515                 for (i = 0; i <= h->highest_lun; i++) {
2516                         /* if the disk has size > 0, it is available */
2517                         if (h->drv[i] && h->drv[i]->heads)
2518                                 newhighest = i;
2519                 }
2520                 h->highest_lun = newhighest;
2521         }
2522         return 0;
2523 }
2524
2525 static int fill_cmd(ctlr_info_t *h, CommandList_struct *c, __u8 cmd, void *buff,
2526                 size_t size, __u8 page_code, unsigned char *scsi3addr,
2527                 int cmd_type)
2528 {
2529         u64bit buff_dma_handle;
2530         int status = IO_OK;
2531
2532         c->cmd_type = CMD_IOCTL_PEND;
2533         c->Header.ReplyQueue = 0;
2534         if (buff != NULL) {
2535                 c->Header.SGList = 1;
2536                 c->Header.SGTotal = 1;
2537         } else {
2538                 c->Header.SGList = 0;
2539                 c->Header.SGTotal = 0;
2540         }
2541         c->Header.Tag.lower = c->busaddr;
2542         memcpy(c->Header.LUN.LunAddrBytes, scsi3addr, 8);
2543
2544         c->Request.Type.Type = cmd_type;
2545         if (cmd_type == TYPE_CMD) {
2546                 switch (cmd) {
2547                 case CISS_INQUIRY:
2548                         /* are we trying to read a vital product page */
2549                         if (page_code != 0) {
2550                                 c->Request.CDB[1] = 0x01;
2551                                 c->Request.CDB[2] = page_code;
2552                         }
2553                         c->Request.CDBLen = 6;
2554                         c->Request.Type.Attribute = ATTR_SIMPLE;
2555                         c->Request.Type.Direction = XFER_READ;
2556                         c->Request.Timeout = 0;
2557                         c->Request.CDB[0] = CISS_INQUIRY;
2558                         c->Request.CDB[4] = size & 0xFF;
2559                         break;
2560                 case CISS_REPORT_LOG:
2561                 case CISS_REPORT_PHYS:
2562                         /* Talking to controller so It's a physical command
2563                            mode = 00 target = 0.  Nothing to write.
2564                          */
2565                         c->Request.CDBLen = 12;
2566                         c->Request.Type.Attribute = ATTR_SIMPLE;
2567                         c->Request.Type.Direction = XFER_READ;
2568                         c->Request.Timeout = 0;
2569                         c->Request.CDB[0] = cmd;
2570                         c->Request.CDB[6] = (size >> 24) & 0xFF; /* MSB */
2571                         c->Request.CDB[7] = (size >> 16) & 0xFF;
2572                         c->Request.CDB[8] = (size >> 8) & 0xFF;
2573                         c->Request.CDB[9] = size & 0xFF;
2574                         break;
2575
2576                 case CCISS_READ_CAPACITY:
2577                         c->Request.CDBLen = 10;
2578                         c->Request.Type.Attribute = ATTR_SIMPLE;
2579                         c->Request.Type.Direction = XFER_READ;
2580                         c->Request.Timeout = 0;
2581                         c->Request.CDB[0] = cmd;
2582                         break;
2583                 case CCISS_READ_CAPACITY_16:
2584                         c->Request.CDBLen = 16;
2585                         c->Request.Type.Attribute = ATTR_SIMPLE;
2586                         c->Request.Type.Direction = XFER_READ;
2587                         c->Request.Timeout = 0;
2588                         c->Request.CDB[0] = cmd;
2589                         c->Request.CDB[1] = 0x10;
2590                         c->Request.CDB[10] = (size >> 24) & 0xFF;
2591                         c->Request.CDB[11] = (size >> 16) & 0xFF;
2592                         c->Request.CDB[12] = (size >> 8) & 0xFF;
2593                         c->Request.CDB[13] = size & 0xFF;
2594                         c->Request.Timeout = 0;
2595                         c->Request.CDB[0] = cmd;
2596                         break;
2597                 case CCISS_CACHE_FLUSH:
2598                         c->Request.CDBLen = 12;
2599                         c->Request.Type.Attribute = ATTR_SIMPLE;
2600                         c->Request.Type.Direction = XFER_WRITE;
2601                         c->Request.Timeout = 0;
2602                         c->Request.CDB[0] = BMIC_WRITE;
2603                         c->Request.CDB[6] = BMIC_CACHE_FLUSH;
2604                         c->Request.CDB[7] = (size >> 8) & 0xFF;
2605                         c->Request.CDB[8] = size & 0xFF;
2606                         break;
2607                 case TEST_UNIT_READY:
2608                         c->Request.CDBLen = 6;
2609                         c->Request.Type.Attribute = ATTR_SIMPLE;
2610                         c->Request.Type.Direction = XFER_NONE;
2611                         c->Request.Timeout = 0;
2612                         break;
2613                 default:
2614                         dev_warn(&h->pdev->dev, "Unknown Command 0x%c\n", cmd);
2615                         return IO_ERROR;
2616                 }
2617         } else if (cmd_type == TYPE_MSG) {
2618                 switch (cmd) {
2619                 case CCISS_ABORT_MSG:
2620                         c->Request.CDBLen = 12;
2621                         c->Request.Type.Attribute = ATTR_SIMPLE;
2622                         c->Request.Type.Direction = XFER_WRITE;
2623                         c->Request.Timeout = 0;
2624                         c->Request.CDB[0] = cmd;        /* abort */
2625                         c->Request.CDB[1] = 0;  /* abort a command */
2626                         /* buff contains the tag of the command to abort */
2627                         memcpy(&c->Request.CDB[4], buff, 8);
2628                         break;
2629                 case CCISS_RESET_MSG:
2630                         c->Request.CDBLen = 16;
2631                         c->Request.Type.Attribute = ATTR_SIMPLE;
2632                         c->Request.Type.Direction = XFER_NONE;
2633                         c->Request.Timeout = 0;
2634                         memset(&c->Request.CDB[0], 0, sizeof(c->Request.CDB));
2635                         c->Request.CDB[0] = cmd;        /* reset */
2636                         c->Request.CDB[1] = CCISS_RESET_TYPE_TARGET;
2637                         break;
2638                 case CCISS_NOOP_MSG:
2639                         c->Request.CDBLen = 1;
2640                         c->Request.Type.Attribute = ATTR_SIMPLE;
2641                         c->Request.Type.Direction = XFER_WRITE;
2642                         c->Request.Timeout = 0;
2643                         c->Request.CDB[0] = cmd;
2644                         break;
2645                 default:
2646                         dev_warn(&h->pdev->dev,
2647                                 "unknown message type %d\n", cmd);
2648                         return IO_ERROR;
2649                 }
2650         } else {
2651                 dev_warn(&h->pdev->dev, "unknown command type %d\n", cmd_type);
2652                 return IO_ERROR;
2653         }
2654         /* Fill in the scatter gather information */
2655         if (size > 0) {
2656                 buff_dma_handle.val = (__u64) pci_map_single(h->pdev,
2657                                                              buff, size,
2658                                                              PCI_DMA_BIDIRECTIONAL);
2659                 c->SG[0].Addr.lower = buff_dma_handle.val32.lower;
2660                 c->SG[0].Addr.upper = buff_dma_handle.val32.upper;
2661                 c->SG[0].Len = size;
2662                 c->SG[0].Ext = 0;       /* we are not chaining */
2663         }
2664         return status;
2665 }
2666
2667 static int __devinit cciss_send_reset(ctlr_info_t *h, unsigned char *scsi3addr,
2668         u8 reset_type)
2669 {
2670         CommandList_struct *c;
2671         int return_status;
2672
2673         c = cmd_alloc(h);
2674         if (!c)
2675                 return -ENOMEM;
2676         return_status = fill_cmd(h, c, CCISS_RESET_MSG, NULL, 0, 0,
2677                 CTLR_LUNID, TYPE_MSG);
2678         c->Request.CDB[1] = reset_type; /* fill_cmd defaults to target reset */
2679         if (return_status != IO_OK) {
2680                 cmd_special_free(h, c);
2681                 return return_status;
2682         }
2683         c->waiting = NULL;
2684         enqueue_cmd_and_start_io(h, c);
2685         /* Don't wait for completion, the reset won't complete.  Don't free
2686          * the command either.  This is the last command we will send before
2687          * re-initializing everything, so it doesn't matter and won't leak.
2688          */
2689         return 0;
2690 }
2691
2692 static int check_target_status(ctlr_info_t *h, CommandList_struct *c)
2693 {
2694         switch (c->err_info->ScsiStatus) {
2695         case SAM_STAT_GOOD:
2696                 return IO_OK;
2697         case SAM_STAT_CHECK_CONDITION:
2698                 switch (0xf & c->err_info->SenseInfo[2]) {
2699                 case 0: return IO_OK; /* no sense */
2700                 case 1: return IO_OK; /* recovered error */
2701                 default:
2702                         if (check_for_unit_attention(h, c))
2703                                 return IO_NEEDS_RETRY;
2704                         dev_warn(&h->pdev->dev, "cmd 0x%02x "
2705                                 "check condition, sense key = 0x%02x\n",
2706                                 c->Request.CDB[0], c->err_info->SenseInfo[2]);
2707                 }
2708                 break;
2709         default:
2710                 dev_warn(&h->pdev->dev, "cmd 0x%02x"
2711                         "scsi status = 0x%02x\n",
2712                         c->Request.CDB[0], c->err_info->ScsiStatus);
2713                 break;
2714         }
2715         return IO_ERROR;
2716 }
2717
2718 static int process_sendcmd_error(ctlr_info_t *h, CommandList_struct *c)
2719 {
2720         int return_status = IO_OK;
2721
2722         if (c->err_info->CommandStatus == CMD_SUCCESS)
2723                 return IO_OK;
2724
2725         switch (c->err_info->CommandStatus) {
2726         case CMD_TARGET_STATUS:
2727                 return_status = check_target_status(h, c);
2728                 break;
2729         case CMD_DATA_UNDERRUN:
2730         case CMD_DATA_OVERRUN:
2731                 /* expected for inquiry and report lun commands */
2732                 break;
2733         case CMD_INVALID:
2734                 dev_warn(&h->pdev->dev, "cmd 0x%02x is "
2735                        "reported invalid\n", c->Request.CDB[0]);
2736                 return_status = IO_ERROR;
2737                 break;
2738         case CMD_PROTOCOL_ERR:
2739                 dev_warn(&h->pdev->dev, "cmd 0x%02x has "
2740                        "protocol error\n", c->Request.CDB[0]);
2741                 return_status = IO_ERROR;
2742                 break;
2743         case CMD_HARDWARE_ERR:
2744                 dev_warn(&h->pdev->dev, "cmd 0x%02x had "
2745                        " hardware error\n", c->Request.CDB[0]);
2746                 return_status = IO_ERROR;
2747                 break;
2748         case CMD_CONNECTION_LOST:
2749                 dev_warn(&h->pdev->dev, "cmd 0x%02x had "
2750                        "connection lost\n", c->Request.CDB[0]);
2751                 return_status = IO_ERROR;
2752                 break;
2753         case CMD_ABORTED:
2754                 dev_warn(&h->pdev->dev, "cmd 0x%02x was "
2755                        "aborted\n", c->Request.CDB[0]);
2756                 return_status = IO_ERROR;
2757                 break;
2758         case CMD_ABORT_FAILED:
2759                 dev_warn(&h->pdev->dev, "cmd 0x%02x reports "
2760                        "abort failed\n", c->Request.CDB[0]);
2761                 return_status = IO_ERROR;
2762                 break;
2763         case CMD_UNSOLICITED_ABORT:
2764                 dev_warn(&h->pdev->dev, "unsolicited abort 0x%02x\n",
2765                         c->Request.CDB[0]);
2766                 return_status = IO_NEEDS_RETRY;
2767                 break;
2768         case CMD_UNABORTABLE:
2769                 dev_warn(&h->pdev->dev, "cmd unabortable\n");
2770                 return_status = IO_ERROR;
2771                 break;
2772         default:
2773                 dev_warn(&h->pdev->dev, "cmd 0x%02x returned "
2774                        "unknown status %x\n", c->Request.CDB[0],
2775                        c->err_info->CommandStatus);
2776                 return_status = IO_ERROR;
2777         }
2778         return return_status;
2779 }
2780
2781 static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c,
2782         int attempt_retry)
2783 {
2784         DECLARE_COMPLETION_ONSTACK(wait);
2785         u64bit buff_dma_handle;
2786         int return_status = IO_OK;
2787
2788 resend_cmd2:
2789         c->waiting = &wait;
2790         enqueue_cmd_and_start_io(h, c);
2791
2792         wait_for_completion(&wait);
2793
2794         if (c->err_info->CommandStatus == 0 || !attempt_retry)
2795                 goto command_done;
2796
2797         return_status = process_sendcmd_error(h, c);
2798
2799         if (return_status == IO_NEEDS_RETRY &&
2800                 c->retry_count < MAX_CMD_RETRIES) {
2801                 dev_warn(&h->pdev->dev, "retrying 0x%02x\n",
2802                         c->Request.CDB[0]);
2803                 c->retry_count++;
2804                 /* erase the old error information */
2805                 memset(c->err_info, 0, sizeof(ErrorInfo_struct));
2806                 return_status = IO_OK;
2807                 INIT_COMPLETION(wait);
2808                 goto resend_cmd2;
2809         }
2810
2811 command_done:
2812         /* unlock the buffers from DMA */
2813         buff_dma_handle.val32.lower = c->SG[0].Addr.lower;
2814         buff_dma_handle.val32.upper = c->SG[0].Addr.upper;
2815         pci_unmap_single(h->pdev, (dma_addr_t) buff_dma_handle.val,
2816                          c->SG[0].Len, PCI_DMA_BIDIRECTIONAL);
2817         return return_status;
2818 }
2819
2820 static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
2821                            __u8 page_code, unsigned char scsi3addr[],
2822                         int cmd_type)
2823 {
2824         CommandList_struct *c;
2825         int return_status;
2826
2827         c = cmd_special_alloc(h);
2828         if (!c)
2829                 return -ENOMEM;
2830         return_status = fill_cmd(h, c, cmd, buff, size, page_code,
2831                 scsi3addr, cmd_type);
2832         if (return_status == IO_OK)
2833                 return_status = sendcmd_withirq_core(h, c, 1);
2834
2835         cmd_special_free(h, c);
2836         return return_status;
2837 }
2838
2839 static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
2840                                    sector_t total_size,
2841                                    unsigned int block_size,
2842                                    InquiryData_struct *inq_buff,
2843                                    drive_info_struct *drv)
2844 {
2845         int return_code;
2846         unsigned long t;
2847         unsigned char scsi3addr[8];
2848
2849         memset(inq_buff, 0, sizeof(InquiryData_struct));
2850         log_unit_to_scsi3addr(h, scsi3addr, logvol);
2851         return_code = sendcmd_withirq(h, CISS_INQUIRY, inq_buff,
2852                         sizeof(*inq_buff), 0xC1, scsi3addr, TYPE_CMD);
2853         if (return_code == IO_OK) {
2854                 if (inq_buff->data_byte[8] == 0xFF) {
2855                         dev_warn(&h->pdev->dev,
2856                                "reading geometry failed, volume "
2857                                "does not support reading geometry\n");
2858                         drv->heads = 255;
2859                         drv->sectors = 32;      /* Sectors per track */
2860                         drv->cylinders = total_size + 1;
2861                         drv->raid_level = RAID_UNKNOWN;
2862                 } else {
2863                         drv->heads = inq_buff->data_byte[6];
2864                         drv->sectors = inq_buff->data_byte[7];
2865                         drv->cylinders = (inq_buff->data_byte[4] & 0xff) << 8;
2866                         drv->cylinders += inq_buff->data_byte[5];
2867                         drv->raid_level = inq_buff->data_byte[8];
2868                 }
2869                 drv->block_size = block_size;
2870                 drv->nr_blocks = total_size + 1;
2871                 t = drv->heads * drv->sectors;
2872                 if (t > 1) {
2873                         sector_t real_size = total_size + 1;
2874                         unsigned long rem = sector_div(real_size, t);
2875                         if (rem)
2876                                 real_size++;
2877                         drv->cylinders = real_size;
2878                 }
2879         } else {                /* Get geometry failed */
2880                 dev_warn(&h->pdev->dev, "reading geometry failed\n");
2881         }
2882 }
2883
2884 static void
2885 cciss_read_capacity(ctlr_info_t *h, int logvol, sector_t *total_size,
2886                     unsigned int *block_size)
2887 {
2888         ReadCapdata_struct *buf;
2889         int return_code;
2890         unsigned char scsi3addr[8];
2891
2892         buf = kzalloc(sizeof(ReadCapdata_struct), GFP_KERNEL);
2893         if (!buf) {
2894                 dev_warn(&h->pdev->dev, "out of memory\n");
2895                 return;
2896         }
2897
2898         log_unit_to_scsi3addr(h, scsi3addr, logvol);
2899         return_code = sendcmd_withirq(h, CCISS_READ_CAPACITY, buf,
2900                 sizeof(ReadCapdata_struct), 0, scsi3addr, TYPE_CMD);
2901         if (return_code == IO_OK) {
2902                 *total_size = be32_to_cpu(*(__be32 *) buf->total_size);
2903                 *block_size = be32_to_cpu(*(__be32 *) buf->block_size);
2904         } else {                /* read capacity command failed */
2905                 dev_warn(&h->pdev->dev, "read capacity failed\n");
2906                 *total_size = 0;
2907                 *block_size = BLOCK_SIZE;
2908         }
2909         kfree(buf);
2910 }
2911
2912 static void cciss_read_capacity_16(ctlr_info_t *h, int logvol,
2913         sector_t *total_size, unsigned int *block_size)
2914 {
2915         ReadCapdata_struct_16 *buf;
2916         int return_code;
2917         unsigned char scsi3addr[8];
2918
2919         buf = kzalloc(sizeof(ReadCapdata_struct_16), GFP_KERNEL);
2920         if (!buf) {
2921                 dev_warn(&h->pdev->dev, "out of memory\n");
2922                 return;
2923         }
2924
2925         log_unit_to_scsi3addr(h, scsi3addr, logvol);
2926         return_code = sendcmd_withirq(h, CCISS_READ_CAPACITY_16,
2927                 buf, sizeof(ReadCapdata_struct_16),
2928                         0, scsi3addr, TYPE_CMD);
2929         if (return_code == IO_OK) {
2930                 *total_size = be64_to_cpu(*(__be64 *) buf->total_size);
2931                 *block_size = be32_to_cpu(*(__be32 *) buf->block_size);
2932         } else {                /* read capacity command failed */
2933                 dev_warn(&h->pdev->dev, "read capacity failed\n");
2934                 *total_size = 0;
2935                 *block_size = BLOCK_SIZE;
2936         }
2937         dev_info(&h->pdev->dev, "      blocks= %llu block_size= %d\n",
2938                (unsigned long long)*total_size+1, *block_size);
2939         kfree(buf);
2940 }
2941
2942 static int cciss_revalidate(struct gendisk *disk)
2943 {
2944         ctlr_info_t *h = get_host(disk);
2945         drive_info_struct *drv = get_drv(disk);
2946         int logvol;
2947         int FOUND = 0;
2948         unsigned int block_size;
2949         sector_t total_size;
2950         InquiryData_struct *inq_buff = NULL;
2951
2952         for (logvol = 0; logvol <= h->highest_lun; logvol++) {
2953                 if (!h->drv[logvol])
2954                         continue;
2955                 if (memcmp(h->drv[logvol]->LunID, drv->LunID,
2956                         sizeof(drv->LunID)) == 0) {
2957                         FOUND = 1;
2958                         break;
2959                 }
2960         }
2961
2962         if (!FOUND)
2963                 return 1;
2964
2965         inq_buff = kmalloc(sizeof(InquiryData_struct), GFP_KERNEL);
2966         if (inq_buff == NULL) {
2967                 dev_warn(&h->pdev->dev, "out of memory\n");
2968                 return 1;
2969         }
2970         if (h->cciss_read == CCISS_READ_10) {
2971                 cciss_read_capacity(h, logvol,
2972                                         &total_size, &block_size);
2973         } else {
2974                 cciss_read_capacity_16(h, logvol,
2975                                         &total_size, &block_size);
2976         }
2977         cciss_geometry_inquiry(h, logvol, total_size, block_size,
2978                                inq_buff, drv);
2979
2980         blk_queue_logical_block_size(drv->queue, drv->block_size);
2981         set_capacity(disk, drv->nr_blocks);
2982
2983         kfree(inq_buff);
2984         return 0;
2985 }
2986
2987 /*
2988  * Map (physical) PCI mem into (virtual) kernel space
2989  */
2990 static void __iomem *remap_pci_mem(ulong base, ulong size)
2991 {
2992         ulong page_base = ((ulong) base) & PAGE_MASK;
2993         ulong page_offs = ((ulong) base) - page_base;
2994         void __iomem *page_remapped = ioremap(page_base, page_offs + size);
2995
2996         return page_remapped ? (page_remapped + page_offs) : NULL;
2997 }
2998
2999 /*
3000  * Takes jobs of the Q and sends them to the hardware, then puts it on
3001  * the Q to wait for completion.
3002  */
3003 static void start_io(ctlr_info_t *h)
3004 {
3005         CommandList_struct *c;
3006
3007         while (!list_empty(&h->reqQ)) {
3008                 c = list_entry(h->reqQ.next, CommandList_struct, list);
3009                 /* can't do anything if fifo is full */
3010                 if ((h->access.fifo_full(h))) {
3011                         dev_warn(&h->pdev->dev, "fifo full\n");
3012                         break;
3013                 }
3014
3015                 /* Get the first entry from the Request Q */
3016                 removeQ(c);
3017                 h->Qdepth--;
3018
3019                 /* Tell the controller execute command */
3020                 h->access.submit_command(h, c);
3021
3022                 /* Put job onto the completed Q */
3023                 addQ(&h->cmpQ, c);
3024         }
3025 }
3026
3027 /* Assumes that h->lock is held. */
3028 /* Zeros out the error record and then resends the command back */
3029 /* to the controller */
3030 static inline void resend_cciss_cmd(ctlr_info_t *h, CommandList_struct *c)
3031 {
3032         /* erase the old error information */
3033         memset(c->err_info, 0, sizeof(ErrorInfo_struct));
3034
3035         /* add it to software queue and then send it to the controller */
3036         addQ(&h->reqQ, c);
3037         h->Qdepth++;
3038         if (h->Qdepth > h->maxQsinceinit)
3039                 h->maxQsinceinit = h->Qdepth;
3040
3041         start_io(h);
3042 }
3043
3044 static inline unsigned int make_status_bytes(unsigned int scsi_status_byte,
3045         unsigned int msg_byte, unsigned int host_byte,
3046         unsigned int driver_byte)
3047 {
3048         /* inverse of macros in scsi.h */
3049         return (scsi_status_byte & 0xff) |
3050                 ((msg_byte & 0xff) << 8) |
3051                 ((host_byte & 0xff) << 16) |
3052                 ((driver_byte & 0xff) << 24);
3053 }
3054
3055 static inline int evaluate_target_status(ctlr_info_t *h,
3056                         CommandList_struct *cmd, int *retry_cmd)
3057 {
3058         unsigned char sense_key;
3059         unsigned char status_byte, msg_byte, host_byte, driver_byte;
3060         int error_value;
3061
3062         *retry_cmd = 0;
3063         /* If we get in here, it means we got "target status", that is, scsi status */
3064         status_byte = cmd->err_info->ScsiStatus;
3065         driver_byte = DRIVER_OK;
3066         msg_byte = cmd->err_info->CommandStatus; /* correct?  seems too device specific */
3067
3068         if (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC)
3069                 host_byte = DID_PASSTHROUGH;
3070         else
3071                 host_byte = DID_OK;
3072
3073         error_value = make_status_bytes(status_byte, msg_byte,
3074                 host_byte, driver_byte);
3075
3076         if (cmd->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION) {
3077                 if (cmd->rq->cmd_type != REQ_TYPE_BLOCK_PC)
3078                         dev_warn(&h->pdev->dev, "cmd %p "
3079                                "has SCSI Status 0x%x\n",
3080                                cmd, cmd->err_info->ScsiStatus);
3081                 return error_value;
3082         }
3083
3084         /* check the sense key */
3085         sense_key = 0xf & cmd->err_info->SenseInfo[2];
3086         /* no status or recovered error */
3087         if (((sense_key == 0x0) || (sense_key == 0x1)) &&
3088             (cmd->rq->cmd_type != REQ_TYPE_BLOCK_PC))
3089                 error_value = 0;
3090
3091         if (check_for_unit_attention(h, cmd)) {
3092                 *retry_cmd = !(cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC);
3093                 return 0;
3094         }
3095
3096         /* Not SG_IO or similar? */
3097         if (cmd->rq->cmd_type != REQ_TYPE_BLOCK_PC) {
3098                 if (error_value != 0)
3099                         dev_warn(&h->pdev->dev, "cmd %p has CHECK CONDITION"
3100                                " sense key = 0x%x\n", cmd, sense_key);
3101                 return error_value;
3102         }
3103
3104         /* SG_IO or similar, copy sense data back */
3105         if (cmd->rq->sense) {
3106                 if (cmd->rq->sense_len > cmd->err_info->SenseLen)
3107                         cmd->rq->sense_len = cmd->err_info->SenseLen;
3108                 memcpy(cmd->rq->sense, cmd->err_info->SenseInfo,
3109                         cmd->rq->sense_len);
3110         } else
3111                 cmd->rq->sense_len = 0;
3112
3113         return error_value;
3114 }
3115
3116 /* checks the status of the job and calls complete buffers to mark all
3117  * buffers for the completed job. Note that this function does not need
3118  * to hold the hba/queue lock.
3119  */
3120 static inline void complete_command(ctlr_info_t *h, CommandList_struct *cmd,
3121                                     int timeout)
3122 {
3123         int retry_cmd = 0;
3124         struct request *rq = cmd->rq;
3125
3126         rq->errors = 0;
3127
3128         if (timeout)
3129                 rq->errors = make_status_bytes(0, 0, 0, DRIVER_TIMEOUT);
3130
3131         if (cmd->err_info->CommandStatus == 0)  /* no error has occurred */
3132                 goto after_error_processing;
3133
3134         switch (cmd->err_info->CommandStatus) {
3135         case CMD_TARGET_STATUS:
3136                 rq->errors = evaluate_target_status(h, cmd, &retry_cmd);
3137                 break;
3138         case CMD_DATA_UNDERRUN:
3139                 if (cmd->rq->cmd_type == REQ_TYPE_FS) {
3140                         dev_warn(&h->pdev->dev, "cmd %p has"
3141                                " completed with data underrun "
3142                                "reported\n", cmd);
3143                         cmd->rq->resid_len = cmd->err_info->ResidualCnt;
3144                 }
3145                 break;
3146         case CMD_DATA_OVERRUN:
3147                 if (cmd->rq->cmd_type == REQ_TYPE_FS)
3148                         dev_warn(&h->pdev->dev, "cciss: cmd %p has"
3149                                " completed with data overrun "
3150                                "reported\n", cmd);
3151                 break;
3152         case CMD_INVALID:
3153                 dev_warn(&h->pdev->dev, "cciss: cmd %p is "
3154                        "reported invalid\n", cmd);
3155                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3156                         cmd->err_info->CommandStatus, DRIVER_OK,
3157                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3158                                 DID_PASSTHROUGH : DID_ERROR);
3159                 break;
3160         case CMD_PROTOCOL_ERR:
3161                 dev_warn(&h->pdev->dev, "cciss: cmd %p has "
3162                        "protocol error\n", cmd);
3163                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3164                         cmd->err_info->CommandStatus, DRIVER_OK,
3165                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3166                                 DID_PASSTHROUGH : DID_ERROR);
3167                 break;
3168         case CMD_HARDWARE_ERR:
3169                 dev_warn(&h->pdev->dev, "cciss: cmd %p had "
3170                        " hardware error\n", cmd);
3171                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3172                         cmd->err_info->CommandStatus, DRIVER_OK,
3173                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3174                                 DID_PASSTHROUGH : DID_ERROR);
3175                 break;
3176         case CMD_CONNECTION_LOST:
3177                 dev_warn(&h->pdev->dev, "cciss: cmd %p had "
3178                        "connection lost\n", cmd);
3179                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3180                         cmd->err_info->CommandStatus, DRIVER_OK,
3181                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3182                                 DID_PASSTHROUGH : DID_ERROR);
3183                 break;
3184         case CMD_ABORTED:
3185                 dev_warn(&h->pdev->dev, "cciss: cmd %p was "
3186                        "aborted\n", cmd);
3187                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3188                         cmd->err_info->CommandStatus, DRIVER_OK,
3189                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3190                                 DID_PASSTHROUGH : DID_ABORT);
3191                 break;
3192         case CMD_ABORT_FAILED:
3193                 dev_warn(&h->pdev->dev, "cciss: cmd %p reports "
3194                        "abort failed\n", cmd);
3195                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3196                         cmd->err_info->CommandStatus, DRIVER_OK,
3197                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3198                                 DID_PASSTHROUGH : DID_ERROR);
3199                 break;
3200         case CMD_UNSOLICITED_ABORT:
3201                 dev_warn(&h->pdev->dev, "cciss%d: unsolicited "
3202                        "abort %p\n", h->ctlr, cmd);
3203                 if (cmd->retry_count < MAX_CMD_RETRIES) {
3204                         retry_cmd = 1;
3205                         dev_warn(&h->pdev->dev, "retrying %p\n", cmd);
3206                         cmd->retry_count++;
3207                 } else
3208                         dev_warn(&h->pdev->dev,
3209                                 "%p retried too many times\n", cmd);
3210                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3211                         cmd->err_info->CommandStatus, DRIVER_OK,
3212                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3213                                 DID_PASSTHROUGH : DID_ABORT);
3214                 break;
3215         case CMD_TIMEOUT:
3216                 dev_warn(&h->pdev->dev, "cmd %p timedout\n", cmd);
3217                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3218                         cmd->err_info->CommandStatus, DRIVER_OK,
3219                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3220                                 DID_PASSTHROUGH : DID_ERROR);
3221                 break;
3222         case CMD_UNABORTABLE:
3223                 dev_warn(&h->pdev->dev, "cmd %p unabortable\n", cmd);
3224                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3225                         cmd->err_info->CommandStatus, DRIVER_OK,
3226                         cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC ?
3227                                 DID_PASSTHROUGH : DID_ERROR);
3228                 break;
3229         default:
3230                 dev_warn(&h->pdev->dev, "cmd %p returned "
3231                        "unknown status %x\n", cmd,
3232                        cmd->err_info->CommandStatus);
3233                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
3234                         cmd->err_info->CommandStatus, DRIVER_OK,
3235                         (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
3236                                 DID_PASSTHROUGH : DID_ERROR);
3237         }
3238
3239 after_error_processing:
3240
3241         /* We need to return this command */
3242         if (retry_cmd) {
3243                 resend_cciss_cmd(h, cmd);
3244                 return;
3245         }
3246         cmd->rq->completion_data = cmd;
3247         blk_complete_request(cmd->rq);
3248 }
3249
3250 static inline u32 cciss_tag_contains_index(u32 tag)
3251 {
3252 #define DIRECT_LOOKUP_BIT 0x10
3253         return tag & DIRECT_LOOKUP_BIT;
3254 }
3255
3256 static inline u32 cciss_tag_to_index(u32 tag)
3257 {
3258 #define DIRECT_LOOKUP_SHIFT 5
3259         return tag >> DIRECT_LOOKUP_SHIFT;
3260 }
3261
3262 static inline u32 cciss_tag_discard_error_bits(ctlr_info_t *h, u32 tag)
3263 {
3264 #define CCISS_PERF_ERROR_BITS ((1 << DIRECT_LOOKUP_SHIFT) - 1)
3265 #define CCISS_SIMPLE_ERROR_BITS 0x03
3266         if (likely(h->transMethod & CFGTBL_Trans_Performant))
3267                 return tag & ~CCISS_PERF_ERROR_BITS;
3268         return tag & ~CCISS_SIMPLE_ERROR_BITS;
3269 }
3270
3271 static inline void cciss_mark_tag_indexed(u32 *tag)
3272 {
3273         *tag |= DIRECT_LOOKUP_BIT;
3274 }
3275
3276 static inline void cciss_set_tag_index(u32 *tag, u32 index)
3277 {
3278         *tag |= (index << DIRECT_LOOKUP_SHIFT);
3279 }
3280
3281 /*
3282  * Get a request and submit it to the controller.
3283  */
3284 static void do_cciss_request(struct request_queue *q)
3285 {
3286         ctlr_info_t *h = q->queuedata;
3287         CommandList_struct *c;
3288         sector_t start_blk;
3289         int seg;
3290         struct request *creq;
3291         u64bit temp64;
3292         struct scatterlist *tmp_sg;
3293         SGDescriptor_struct *curr_sg;
3294         drive_info_struct *drv;
3295         int i, dir;
3296         int sg_index = 0;
3297         int chained = 0;
3298
3299       queue:
3300         creq = blk_peek_request(q);
3301         if (!creq)
3302                 goto startio;
3303
3304         BUG_ON(creq->nr_phys_segments > h->maxsgentries);
3305
3306         c = cmd_alloc(h);
3307         if (!c)
3308                 goto full;
3309
3310         blk_start_request(creq);
3311
3312         tmp_sg = h->scatter_list[c->cmdindex];
3313         spin_unlock_irq(q->queue_lock);
3314
3315         c->cmd_type = CMD_RWREQ;
3316         c->rq = creq;
3317
3318         /* fill in the request */
3319         drv = creq->rq_disk->private_data;
3320         c->Header.ReplyQueue = 0;       /* unused in simple mode */
3321         /* got command from pool, so use the command block index instead */
3322         /* for direct lookups. */
3323         /* The first 2 bits are reserved for controller error reporting. */
3324         cciss_set_tag_index(&c->Header.Tag.lower, c->cmdindex);
3325         cciss_mark_tag_indexed(&c->Header.Tag.lower);
3326         memcpy(&c->Header.LUN, drv->LunID, sizeof(drv->LunID));
3327         c->Request.CDBLen = 10; /* 12 byte commands not in FW yet; */
3328         c->Request.Type.Type = TYPE_CMD;        /* It is a command. */
3329         c->Request.Type.Attribute = ATTR_SIMPLE;
3330         c->Request.Type.Direction =
3331             (rq_data_dir(creq) == READ) ? XFER_READ : XFER_WRITE;
3332         c->Request.Timeout = 0; /* Don't time out */
3333         c->Request.CDB[0] =
3334             (rq_data_dir(creq) == READ) ? h->cciss_read : h->cciss_write;
3335         start_blk = blk_rq_pos(creq);
3336         dev_dbg(&h->pdev->dev, "sector =%d nr_sectors=%d\n",
3337                (int)blk_rq_pos(creq), (int)blk_rq_sectors(creq));
3338         sg_init_table(tmp_sg, h->maxsgentries);
3339         seg = blk_rq_map_sg(q, creq, tmp_sg);
3340
3341         /* get the DMA records for the setup */
3342         if (c->Request.Type.Direction == XFER_READ)
3343                 dir = PCI_DMA_FROMDEVICE;
3344         else
3345                 dir = PCI_DMA_TODEVICE;
3346
3347         curr_sg = c->SG;
3348         sg_index = 0;
3349         chained = 0;
3350
3351         for (i = 0; i < seg; i++) {
3352                 if (((sg_index+1) == (h->max_cmd_sgentries)) &&
3353                         !chained && ((seg - i) > 1)) {
3354                         /* Point to next chain block. */
3355                         curr_sg = h->cmd_sg_list[c->cmdindex];
3356                         sg_index = 0;
3357                         chained = 1;
3358                 }
3359                 curr_sg[sg_index].Len = tmp_sg[i].length;
3360                 temp64.val = (__u64) pci_map_page(h->pdev, sg_page(&tmp_sg[i]),
3361                                                 tmp_sg[i].offset,
3362                                                 tmp_sg[i].length, dir);
3363                 curr_sg[sg_index].Addr.lower = temp64.val32.lower;
3364                 curr_sg[sg_index].Addr.upper = temp64.val32.upper;
3365                 curr_sg[sg_index].Ext = 0;  /* we are not chaining */
3366                 ++sg_index;
3367         }
3368         if (chained)
3369                 cciss_map_sg_chain_block(h, c, h->cmd_sg_list[c->cmdindex],
3370                         (seg - (h->max_cmd_sgentries - 1)) *
3371                                 sizeof(SGDescriptor_struct));
3372
3373         /* track how many SG entries we are using */
3374         if (seg > h->maxSG)
3375                 h->maxSG = seg;
3376
3377         dev_dbg(&h->pdev->dev, "Submitting %u sectors in %d segments "
3378                         "chained[%d]\n",
3379                         blk_rq_sectors(creq), seg, chained);
3380
3381         c->Header.SGTotal = seg + chained;
3382         if (seg <= h->max_cmd_sgentries)
3383                 c->Header.SGList = c->Header.SGTotal;
3384         else
3385                 c->Header.SGList = h->max_cmd_sgentries;
3386         set_performant_mode(h, c);
3387
3388         if (likely(creq->cmd_type == REQ_TYPE_FS)) {
3389                 if(h->cciss_read == CCISS_READ_10) {
3390                         c->Request.CDB[1] = 0;
3391                         c->Request.CDB[2] = (start_blk >> 24) & 0xff; /* MSB */
3392                         c->Request.CDB[3] = (start_blk >> 16) & 0xff;
3393                         c->Request.CDB[4] = (start_blk >> 8) & 0xff;
3394                         c->Request.CDB[5] = start_blk & 0xff;
3395                         c->Request.CDB[6] = 0; /* (sect >> 24) & 0xff; MSB */
3396                         c->Request.CDB[7] = (blk_rq_sectors(creq) >> 8) & 0xff;
3397                         c->Request.CDB[8] = blk_rq_sectors(creq) & 0xff;
3398                         c->Request.CDB[9] = c->Request.CDB[11] = c->Request.CDB[12] = 0;
3399                 } else {
3400                         u32 upper32 = upper_32_bits(start_blk);
3401
3402                         c->Request.CDBLen = 16;
3403                         c->Request.CDB[1]= 0;
3404                         c->Request.CDB[2]= (upper32 >> 24) & 0xff; /* MSB */
3405                         c->Request.CDB[3]= (upper32 >> 16) & 0xff;
3406                         c->Request.CDB[4]= (upper32 >>  8) & 0xff;
3407                         c->Request.CDB[5]= upper32 & 0xff;
3408                         c->Request.CDB[6]= (start_blk >> 24) & 0xff;
3409                         c->Request.CDB[7]= (start_blk >> 16) & 0xff;
3410                         c->Request.CDB[8]= (start_blk >>  8) & 0xff;
3411                         c->Request.CDB[9]= start_blk & 0xff;
3412                         c->Request.CDB[10]= (blk_rq_sectors(creq) >> 24) & 0xff;
3413                         c->Request.CDB[11]= (blk_rq_sectors(creq) >> 16) & 0xff;
3414                         c->Request.CDB[12]= (blk_rq_sectors(creq) >>  8) & 0xff;
3415                         c->Request.CDB[13]= blk_rq_sectors(creq) & 0xff;
3416                         c->Request.CDB[14] = c->Request.CDB[15] = 0;
3417                 }
3418         } else if (creq->cmd_type == REQ_TYPE_BLOCK_PC) {
3419                 c->Request.CDBLen = creq->cmd_len;
3420                 memcpy(c->Request.CDB, creq->cmd, BLK_MAX_CDB);
3421         } else {
3422                 dev_warn(&h->pdev->dev, "bad request type %d\n",
3423                         creq->cmd_type);
3424                 BUG();
3425         }
3426
3427         spin_lock_irq(q->queue_lock);
3428
3429         addQ(&h->reqQ, c);
3430         h->Qdepth++;
3431         if (h->Qdepth > h->maxQsinceinit)
3432                 h->maxQsinceinit = h->Qdepth;
3433
3434         goto queue;
3435 full:
3436         blk_stop_queue(q);
3437 startio:
3438         /* We will already have the driver lock here so not need
3439          * to lock it.
3440          */
3441         start_io(h);
3442 }
3443
3444 static inline unsigned long get_next_completion(ctlr_info_t *h)
3445 {
3446         return h->access.command_completed(h);
3447 }
3448
3449 static inline int interrupt_pending(ctlr_info_t *h)
3450 {
3451         return h->access.intr_pending(h);
3452 }
3453
3454 static inline long interrupt_not_for_us(ctlr_info_t *h)
3455 {
3456         return ((h->access.intr_pending(h) == 0) ||
3457                 (h->interrupts_enabled == 0));
3458 }
3459
3460 static inline int bad_tag(ctlr_info_t *h, u32 tag_index,
3461                         u32 raw_tag)
3462 {
3463         if (unlikely(tag_index >= h->nr_cmds)) {
3464                 dev_warn(&h->pdev->dev, "bad tag 0x%08x ignored.\n", raw_tag);
3465                 return 1;
3466         }
3467         return 0;
3468 }
3469
3470 static inline void finish_cmd(ctlr_info_t *h, CommandList_struct *c,
3471                                 u32 raw_tag)
3472 {
3473         removeQ(c);
3474         if (likely(c->cmd_type == CMD_RWREQ))
3475                 complete_command(h, c, 0);
3476         else if (c->cmd_type == CMD_IOCTL_PEND)
3477                 complete(c->waiting);
3478 #ifdef CONFIG_CISS_SCSI_TAPE
3479         else if (c->cmd_type == CMD_SCSI)
3480                 complete_scsi_command(c, 0, raw_tag);
3481 #endif
3482 }
3483
3484 static inline u32 next_command(ctlr_info_t *h)
3485 {
3486         u32 a;
3487
3488         if (unlikely(!(h->transMethod & CFGTBL_Trans_Performant)))
3489                 return h->access.command_completed(h);
3490
3491         if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
3492                 a = *(h->reply_pool_head); /* Next cmd in ring buffer */
3493                 (h->reply_pool_head)++;
3494                 h->commands_outstanding--;
3495         } else {
3496                 a = FIFO_EMPTY;
3497         }
3498         /* Check for wraparound */
3499         if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
3500                 h->reply_pool_head = h->reply_pool;
3501                 h->reply_pool_wraparound ^= 1;
3502         }
3503         return a;
3504 }
3505
3506 /* process completion of an indexed ("direct lookup") command */
3507 static inline u32 process_indexed_cmd(ctlr_info_t *h, u32 raw_tag)
3508 {
3509         u32 tag_index;
3510         CommandList_struct *c;
3511
3512         tag_index = cciss_tag_to_index(raw_tag);
3513         if (bad_tag(h, tag_index, raw_tag))
3514                 return next_command(h);
3515         c = h->cmd_pool + tag_index;
3516         finish_cmd(h, c, raw_tag);
3517         return next_command(h);
3518 }
3519
3520 /* process completion of a non-indexed command */
3521 static inline u32 process_nonindexed_cmd(ctlr_info_t *h, u32 raw_tag)
3522 {
3523         CommandList_struct *c = NULL;
3524         __u32 busaddr_masked, tag_masked;
3525
3526         tag_masked = cciss_tag_discard_error_bits(h, raw_tag);
3527         list_for_each_entry(c, &h->cmpQ, list) {
3528                 busaddr_masked = cciss_tag_discard_error_bits(h, c->busaddr);
3529                 if (busaddr_masked == tag_masked) {
3530                         finish_cmd(h, c, raw_tag);
3531                         return next_command(h);
3532                 }
3533         }
3534         bad_tag(h, h->nr_cmds + 1, raw_tag);
3535         return next_command(h);
3536 }
3537
3538 /* Some controllers, like p400, will give us one interrupt
3539  * after a soft reset, even if we turned interrupts off.
3540  * Only need to check for this in the cciss_xxx_discard_completions
3541  * functions.
3542  */
3543 static int ignore_bogus_interrupt(ctlr_info_t *h)
3544 {
3545         if (likely(!reset_devices))
3546                 return 0;
3547
3548         if (likely(h->interrupts_enabled))
3549                 return 0;
3550
3551         dev_info(&h->pdev->dev, "Received interrupt while interrupts disabled "
3552                 "(known firmware bug.)  Ignoring.\n");
3553
3554         return 1;
3555 }
3556
3557 static irqreturn_t cciss_intx_discard_completions(int irq, void *dev_id)
3558 {
3559         ctlr_info_t *h = dev_id;
3560         unsigned long flags;
3561         u32 raw_tag;
3562
3563         if (ignore_bogus_interrupt(h))
3564                 return IRQ_NONE;
3565
3566         if (interrupt_not_for_us(h))
3567                 return IRQ_NONE;
3568         spin_lock_irqsave(&h->lock, flags);
3569         while (interrupt_pending(h)) {
3570                 raw_tag = get_next_completion(h);
3571                 while (raw_tag != FIFO_EMPTY)
3572                         raw_tag = next_command(h);
3573         }
3574         spin_unlock_irqrestore(&h->lock, flags);
3575         return IRQ_HANDLED;
3576 }
3577
3578 static irqreturn_t cciss_msix_discard_completions(int irq, void *dev_id)
3579 {
3580         ctlr_info_t *h = dev_id;
3581         unsigned long flags;
3582         u32 raw_tag;
3583
3584         if (ignore_bogus_interrupt(h))
3585                 return IRQ_NONE;
3586
3587         spin_lock_irqsave(&h->lock, flags);
3588         raw_tag = get_next_completion(h);
3589         while (raw_tag != FIFO_EMPTY)
3590                 raw_tag = next_command(h);
3591         spin_unlock_irqrestore(&h->lock, flags);
3592         return IRQ_HANDLED;
3593 }
3594
3595 static irqreturn_t do_cciss_intx(int irq, void *dev_id)
3596 {
3597         ctlr_info_t *h = dev_id;
3598         unsigned long flags;
3599         u32 raw_tag;
3600
3601         if (interrupt_not_for_us(h))
3602                 return IRQ_NONE;
3603         spin_lock_irqsave(&h->lock, flags);
3604         while (interrupt_pending(h)) {
3605                 raw_tag = get_next_completion(h);
3606                 while (raw_tag != FIFO_EMPTY) {
3607                         if (cciss_tag_contains_index(raw_tag))
3608                                 raw_tag = process_indexed_cmd(h, raw_tag);
3609                         else
3610                                 raw_tag = process_nonindexed_cmd(h, raw_tag);
3611                 }
3612         }
3613         spin_unlock_irqrestore(&h->lock, flags);
3614         return IRQ_HANDLED;
3615 }
3616
3617 /* Add a second interrupt handler for MSI/MSI-X mode. In this mode we never
3618  * check the interrupt pending register because it is not set.
3619  */
3620 static irqreturn_t do_cciss_msix_intr(int irq, void *dev_id)
3621 {
3622         ctlr_info_t *h = dev_id;
3623         unsigned long flags;
3624         u32 raw_tag;
3625
3626         spin_lock_irqsave(&h->lock, flags);
3627         raw_tag = get_next_completion(h);
3628         while (raw_tag != FIFO_EMPTY) {
3629                 if (cciss_tag_contains_index(raw_tag))
3630                         raw_tag = process_indexed_cmd(h, raw_tag);
3631                 else
3632                         raw_tag = process_nonindexed_cmd(h, raw_tag);
3633         }
3634         spin_unlock_irqrestore(&h->lock, flags);
3635         return IRQ_HANDLED;
3636 }
3637
3638 /**
3639  * add_to_scan_list() - add controller to rescan queue
3640  * @h:                Pointer to the controller.
3641  *
3642  * Adds the controller to the rescan queue if not already on the queue.
3643  *
3644  * returns 1 if added to the queue, 0 if skipped (could be on the
3645  * queue already, or the controller could be initializing or shutting
3646  * down).
3647  **/
3648 static int add_to_scan_list(struct ctlr_info *h)
3649 {
3650         struct ctlr_info *test_h;
3651         int found = 0;
3652         int ret = 0;
3653
3654         if (h->busy_initializing)
3655                 return 0;
3656
3657         if (!mutex_trylock(&h->busy_shutting_down))
3658                 return 0;
3659
3660         mutex_lock(&scan_mutex);
3661         list_for_each_entry(test_h, &scan_q, scan_list) {
3662                 if (test_h == h) {
3663                         found = 1;
3664                         break;
3665                 }
3666         }
3667         if (!found && !h->busy_scanning) {
3668                 INIT_COMPLETION(h->scan_wait);
3669                 list_add_tail(&h->scan_list, &scan_q);
3670                 ret = 1;
3671         }
3672         mutex_unlock(&scan_mutex);
3673         mutex_unlock(&h->busy_shutting_down);
3674
3675         return ret;
3676 }
3677
3678 /**
3679  * remove_from_scan_list() - remove controller from rescan queue
3680  * @h:                     Pointer to the controller.
3681  *
3682  * Removes the controller from the rescan queue if present. Blocks if
3683  * the controller is currently conducting a rescan.  The controller
3684  * can be in one of three states:
3685  * 1. Doesn't need a scan
3686  * 2. On the scan list, but not scanning yet (we remove it)
3687  * 3. Busy scanning (and not on the list). In this case we want to wait for
3688  *    the scan to complete to make sure the scanning thread for this
3689  *    controller is completely idle.
3690  **/
3691 static void remove_from_scan_list(struct ctlr_info *h)
3692 {
3693         struct ctlr_info *test_h, *tmp_h;
3694
3695         mutex_lock(&scan_mutex);
3696         list_for_each_entry_safe(test_h, tmp_h, &scan_q, scan_list) {
3697                 if (test_h == h) { /* state 2. */
3698                         list_del(&h->scan_list);
3699                         complete_all(&h->scan_wait);
3700                         mutex_unlock(&scan_mutex);
3701                         return;
3702                 }
3703         }
3704         if (h->busy_scanning) { /* state 3. */
3705                 mutex_unlock(&scan_mutex);
3706                 wait_for_completion(&h->scan_wait);
3707         } else { /* state 1, nothing to do. */
3708                 mutex_unlock(&scan_mutex);
3709         }
3710 }
3711
3712 /**
3713  * scan_thread() - kernel thread used to rescan controllers
3714  * @data:        Ignored.
3715  *
3716  * A kernel thread used scan for drive topology changes on
3717  * controllers. The thread processes only one controller at a time
3718  * using a queue.  Controllers are added to the queue using
3719  * add_to_scan_list() and removed from the queue either after done
3720  * processing or using remove_from_scan_list().
3721  *
3722  * returns 0.
3723  **/
3724 static int scan_thread(void *data)
3725 {
3726         struct ctlr_info *h;
3727
3728         while (1) {
3729                 set_current_state(TASK_INTERRUPTIBLE);
3730                 schedule();
3731                 if (kthread_should_stop())
3732                         break;
3733
3734                 while (1) {
3735                         mutex_lock(&scan_mutex);
3736                         if (list_empty(&scan_q)) {
3737                                 mutex_unlock(&scan_mutex);
3738                                 break;
3739                         }
3740
3741                         h = list_entry(scan_q.next,
3742                                        struct ctlr_info,
3743                                        scan_list);
3744                         list_del(&h->scan_list);
3745                         h->busy_scanning = 1;
3746                         mutex_unlock(&scan_mutex);
3747
3748                         rebuild_lun_table(h, 0, 0);
3749                         complete_all(&h->scan_wait);
3750                         mutex_lock(&scan_mutex);
3751                         h->busy_scanning = 0;
3752                         mutex_unlock(&scan_mutex);
3753                 }
3754         }
3755
3756         return 0;
3757 }
3758
3759 static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c)
3760 {
3761         if (c->err_info->SenseInfo[2] != UNIT_ATTENTION)
3762                 return 0;
3763
3764         switch (c->err_info->SenseInfo[12]) {
3765         case STATE_CHANGED:
3766                 dev_warn(&h->pdev->dev, "a state change "
3767                         "detected, command retried\n");
3768                 return 1;
3769         break;
3770         case LUN_FAILED:
3771                 dev_warn(&h->pdev->dev, "LUN failure "
3772                         "detected, action required\n");
3773                 return 1;
3774         break;
3775         case REPORT_LUNS_CHANGED:
3776                 dev_warn(&h->pdev->dev, "report LUN data changed\n");
3777         /*
3778          * Here, we could call add_to_scan_list and wake up the scan thread,
3779          * except that it's quite likely that we will get more than one
3780          * REPORT_LUNS_CHANGED condition in quick succession, which means
3781          * that those which occur after the first one will likely happen
3782          * *during* the scan_thread's rescan.  And the rescan code is not
3783          * robust enough to restart in the middle, undoing what it has already
3784          * done, and it's not clear that it's even possible to do this, since
3785          * part of what it does is notify the block layer, which starts
3786          * doing it's own i/o to read partition tables and so on, and the
3787          * driver doesn't have visibility to know what might need undoing.
3788          * In any event, if possible, it is horribly complicated to get right
3789          * so we just don't do it for now.
3790          *
3791          * Note: this REPORT_LUNS_CHANGED condition only occurs on the MSA2012.
3792          */
3793                 return 1;
3794         break;
3795         case POWER_OR_RESET:
3796                 dev_warn(&h->pdev->dev,
3797                         "a power on or device reset detected\n");
3798                 return 1;
3799         break;
3800         case UNIT_ATTENTION_CLEARED:
3801                 dev_warn(&h->pdev->dev,
3802                         "unit attention cleared by another initiator\n");
3803                 return 1;
3804         break;
3805         default:
3806                 dev_warn(&h->pdev->dev, "unknown unit attention detected\n");
3807                 return 1;
3808         }
3809 }
3810
3811 /*
3812  *  We cannot read the structure directly, for portability we must use
3813  *   the io functions.
3814  *   This is for debug only.
3815  */
3816 static void print_cfg_table(ctlr_info_t *h)
3817 {
3818         int i;
3819         char temp_name[17];
3820         CfgTable_struct *tb = h->cfgtable;
3821
3822         dev_dbg(&h->pdev->dev, "Controller Configuration information\n");
3823         dev_dbg(&h->pdev->dev, "------------------------------------\n");
3824         for (i = 0; i < 4; i++)
3825                 temp_name[i] = readb(&(tb->Signature[i]));
3826         temp_name[4] = '\0';
3827         dev_dbg(&h->pdev->dev, "   Signature = %s\n", temp_name);
3828         dev_dbg(&h->pdev->dev, "   Spec Number = %d\n",
3829                 readl(&(tb->SpecValence)));
3830         dev_dbg(&h->pdev->dev, "   Transport methods supported = 0x%x\n",
3831                readl(&(tb->TransportSupport)));
3832         dev_dbg(&h->pdev->dev, "   Transport methods active = 0x%x\n",
3833                readl(&(tb->TransportActive)));
3834         dev_dbg(&h->pdev->dev, "   Requested transport Method = 0x%x\n",
3835                readl(&(tb->HostWrite.TransportRequest)));
3836         dev_dbg(&h->pdev->dev, "   Coalesce Interrupt Delay = 0x%x\n",
3837                readl(&(tb->HostWrite.CoalIntDelay)));
3838         dev_dbg(&h->pdev->dev, "   Coalesce Interrupt Count = 0x%x\n",
3839                readl(&(tb->HostWrite.CoalIntCount)));
3840         dev_dbg(&h->pdev->dev, "   Max outstanding commands = 0x%d\n",
3841                readl(&(tb->CmdsOutMax)));
3842         dev_dbg(&h->pdev->dev, "   Bus Types = 0x%x\n",
3843                 readl(&(tb->BusTypes)));
3844         for (i = 0; i < 16; i++)
3845                 temp_name[i] = readb(&(tb->ServerName[i]));
3846         temp_name[16] = '\0';
3847         dev_dbg(&h->pdev->dev, "   Server Name = %s\n", temp_name);
3848         dev_dbg(&h->pdev->dev, "   Heartbeat Counter = 0x%x\n\n\n",
3849                 readl(&(tb->HeartBeat)));
3850 }
3851
3852 static int find_PCI_BAR_index(struct pci_dev *pdev, unsigned long pci_bar_addr)
3853 {
3854         int i, offset, mem_type, bar_type;
3855         if (pci_bar_addr == PCI_BASE_ADDRESS_0) /* looking for BAR zero? */
3856                 return 0;
3857         offset = 0;
3858         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
3859                 bar_type = pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE;
3860                 if (bar_type == PCI_BASE_ADDRESS_SPACE_IO)
3861                         offset += 4;
3862                 else {
3863                         mem_type = pci_resource_flags(pdev, i) &
3864                             PCI_BASE_ADDRESS_MEM_TYPE_MASK;
3865                         switch (mem_type) {
3866                         case PCI_BASE_ADDRESS_MEM_TYPE_32:
3867                         case PCI_BASE_ADDRESS_MEM_TYPE_1M:
3868                                 offset += 4;    /* 32 bit */
3869                                 break;
3870                         case PCI_BASE_ADDRESS_MEM_TYPE_64:
3871                                 offset += 8;
3872                                 break;
3873                         default:        /* reserved in PCI 2.2 */
3874                                 dev_warn(&pdev->dev,
3875                                        "Base address is invalid\n");
3876                                 return -1;
3877                                 break;
3878                         }
3879                 }
3880                 if (offset == pci_bar_addr - PCI_BASE_ADDRESS_0)
3881                         return i + 1;
3882         }
3883         return -1;
3884 }
3885
3886 /* Fill in bucket_map[], given nsgs (the max number of
3887  * scatter gather elements supported) and bucket[],
3888  * which is an array of 8 integers.  The bucket[] array
3889  * contains 8 different DMA transfer sizes (in 16
3890  * byte increments) which the controller uses to fetch
3891  * commands.  This function fills in bucket_map[], which
3892  * maps a given number of scatter gather elements to one of
3893  * the 8 DMA transfer sizes.  The point of it is to allow the
3894  * controller to only do as much DMA as needed to fetch the
3895  * command, with the DMA transfer size encoded in the lower
3896  * bits of the command address.
3897  */
3898 static void  calc_bucket_map(int bucket[], int num_buckets,
3899         int nsgs, int *bucket_map)
3900 {
3901         int i, j, b, size;
3902
3903         /* even a command with 0 SGs requires 4 blocks */
3904 #define MINIMUM_TRANSFER_BLOCKS 4
3905 #define NUM_BUCKETS 8
3906         /* Note, bucket_map must have nsgs+1 entries. */
3907         for (i = 0; i <= nsgs; i++) {
3908                 /* Compute size of a command with i SG entries */
3909                 size = i + MINIMUM_TRANSFER_BLOCKS;
3910                 b = num_buckets; /* Assume the biggest bucket */
3911                 /* Find the bucket that is just big enough */
3912                 for (j = 0; j < 8; j++) {
3913                         if (bucket[j] >= size) {
3914                                 b = j;
3915                                 break;
3916                         }
3917                 }
3918                 /* for a command with i SG entries, use bucket b. */
3919                 bucket_map[i] = b;
3920         }
3921 }
3922
3923 static void __devinit cciss_wait_for_mode_change_ack(ctlr_info_t *h)
3924 {
3925         int i;
3926
3927         /* under certain very rare conditions, this can take awhile.
3928          * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
3929          * as we enter this code.) */
3930         for (i = 0; i < MAX_CONFIG_WAIT; i++) {
3931                 if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
3932                         break;
3933                 usleep_range(10000, 20000);
3934         }
3935 }
3936
3937 static __devinit void cciss_enter_performant_mode(ctlr_info_t *h,
3938         u32 use_short_tags)
3939 {
3940         /* This is a bit complicated.  There are 8 registers on
3941          * the controller which we write to to tell it 8 different
3942          * sizes of commands which there may be.  It's a way of
3943          * reducing the DMA done to fetch each command.  Encoded into
3944          * each command's tag are 3 bits which communicate to the controller
3945          * which of the eight sizes that command fits within.  The size of
3946          * each command depends on how many scatter gather entries there are.
3947          * Each SG entry requires 16 bytes.  The eight registers are programmed
3948          * with the number of 16-byte blocks a command of that size requires.
3949          * The smallest command possible requires 5 such 16 byte blocks.
3950          * the largest command possible requires MAXSGENTRIES + 4 16-byte
3951          * blocks.  Note, this only extends to the SG entries contained
3952          * within the command block, and does not extend to chained blocks
3953          * of SG elements.   bft[] contains the eight values we write to
3954          * the registers.  They are not evenly distributed, but have more
3955          * sizes for small commands, and fewer sizes for larger commands.
3956          */
3957         __u32 trans_offset;
3958         int bft[8] = { 5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
3959                         /*
3960                          *  5 = 1 s/g entry or 4k
3961                          *  6 = 2 s/g entry or 8k
3962                          *  8 = 4 s/g entry or 16k
3963                          * 10 = 6 s/g entry or 24k
3964                          */
3965         unsigned long register_value;
3966         BUILD_BUG_ON(28 > MAXSGENTRIES + 4);
3967
3968         h->reply_pool_wraparound = 1; /* spec: init to 1 */
3969
3970         /* Controller spec: zero out this buffer. */
3971         memset(h->reply_pool, 0, h->max_commands * sizeof(__u64));
3972         h->reply_pool_head = h->reply_pool;
3973
3974         trans_offset = readl(&(h->cfgtable->TransMethodOffset));
3975         calc_bucket_map(bft, ARRAY_SIZE(bft), h->maxsgentries,
3976                                 h->blockFetchTable);
3977         writel(bft[0], &h->transtable->BlockFetch0);
3978         writel(bft[1], &h->transtable->BlockFetch1);
3979         writel(bft[2], &h->transtable->BlockFetch2);
3980         writel(bft[3], &h->transtable->BlockFetch3);
3981         writel(bft[4], &h->transtable->BlockFetch4);
3982         writel(bft[5], &h->transtable->BlockFetch5);
3983         writel(bft[6], &h->transtable->BlockFetch6);
3984         writel(bft[7], &h->transtable->BlockFetch7);
3985
3986         /* size of controller ring buffer */
3987         writel(h->max_commands, &h->transtable->RepQSize);
3988         writel(1, &h->transtable->RepQCount);
3989         writel(0, &h->transtable->RepQCtrAddrLow32);
3990         writel(0, &h->transtable->RepQCtrAddrHigh32);
3991         writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
3992         writel(0, &h->transtable->RepQAddr0High32);
3993         writel(CFGTBL_Trans_Performant | use_short_tags,
3994                         &(h->cfgtable->HostWrite.TransportRequest));
3995
3996         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
3997         cciss_wait_for_mode_change_ack(h);
3998         register_value = readl(&(h->cfgtable->TransportActive));
3999         if (!(register_value & CFGTBL_Trans_Performant))
4000                 dev_warn(&h->pdev->dev, "cciss: unable to get board into"
4001                                         " performant mode\n");
4002 }
4003
4004 static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
4005 {
4006         __u32 trans_support;
4007
4008         if (cciss_simple_mode)
4009                 return;
4010
4011         dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n");
4012         /* Attempt to put controller into performant mode if supported */
4013         /* Does board support performant mode? */
4014         trans_support = readl(&(h->cfgtable->TransportSupport));
4015         if (!(trans_support & PERFORMANT_MODE))
4016                 return;
4017
4018         dev_dbg(&h->pdev->dev, "Placing controller into performant mode\n");
4019         /* Performant mode demands commands on a 32 byte boundary
4020          * pci_alloc_consistent aligns on page boundarys already.
4021          * Just need to check if divisible by 32
4022          */
4023         if ((sizeof(CommandList_struct) % 32) != 0) {
4024                 dev_warn(&h->pdev->dev, "%s %d %s\n",
4025                         "cciss info: command size[",
4026                         (int)sizeof(CommandList_struct),
4027                         "] not divisible by 32, no performant mode..\n");
4028                 return;
4029         }
4030
4031         /* Performant mode ring buffer and supporting data structures */
4032         h->reply_pool = (__u64 *)pci_alloc_consistent(
4033                 h->pdev, h->max_commands * sizeof(__u64),
4034                 &(h->reply_pool_dhandle));
4035
4036         /* Need a block fetch table for performant mode */
4037         h->blockFetchTable = kmalloc(((h->maxsgentries+1) *
4038                 sizeof(__u32)), GFP_KERNEL);
4039
4040         if ((h->reply_pool == NULL) || (h->blockFetchTable == NULL))
4041                 goto clean_up;
4042
4043         cciss_enter_performant_mode(h,
4044                 trans_support & CFGTBL_Trans_use_short_tags);
4045
4046         /* Change the access methods to the performant access methods */
4047         h->access = SA5_performant_access;
4048         h->transMethod = CFGTBL_Trans_Performant;
4049
4050         return;
4051 clean_up:
4052         kfree(h->blockFetchTable);
4053         if (h->reply_pool)
4054                 pci_free_consistent(h->pdev,
4055                                 h->max_commands * sizeof(__u64),
4056                                 h->reply_pool,
4057                                 h->reply_pool_dhandle);
4058         return;
4059
4060 } /* cciss_put_controller_into_performant_mode */
4061
4062 /* If MSI/MSI-X is supported by the kernel we will try to enable it on
4063  * controllers that are capable. If not, we use IO-APIC mode.
4064  */
4065
4066 static void __devinit cciss_interrupt_mode(ctlr_info_t *h)
4067 {
4068 #ifdef CONFIG_PCI_MSI
4069         int err;
4070         struct msix_entry cciss_msix_entries[4] = { {0, 0}, {0, 1},
4071         {0, 2}, {0, 3}
4072         };
4073
4074         /* Some boards advertise MSI but don't really support it */
4075         if ((h->board_id == 0x40700E11) || (h->board_id == 0x40800E11) ||
4076             (h->board_id == 0x40820E11) || (h->board_id == 0x40830E11))
4077                 goto default_int_mode;
4078
4079         if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
4080                 err = pci_enable_msix(h->pdev, cciss_msix_entries, 4);
4081                 if (!err) {
4082                         h->intr[0] = cciss_msix_entries[0].vector;
4083                         h->intr[1] = cciss_msix_entries[1].vector;
4084                         h->intr[2] = cciss_msix_entries[2].vector;
4085                         h->intr[3] = cciss_msix_entries[3].vector;
4086                         h->msix_vector = 1;
4087                         return;
4088                 }
4089                 if (err > 0) {
4090                         dev_warn(&h->pdev->dev,
4091                                 "only %d MSI-X vectors available\n", err);
4092                         goto default_int_mode;
4093                 } else {
4094                         dev_warn(&h->pdev->dev,
4095                                 "MSI-X init failed %d\n", err);
4096                         goto default_int_mode;
4097                 }
4098         }
4099         if (pci_find_capability(h->pdev, PCI_CAP_ID_MSI)) {
4100                 if (!pci_enable_msi(h->pdev))
4101                         h->msi_vector = 1;
4102                 else
4103                         dev_warn(&h->pdev->dev, "MSI init failed\n");
4104         }
4105 default_int_mode:
4106 #endif                          /* CONFIG_PCI_MSI */
4107         /* if we get here we're going to use the default interrupt mode */
4108         h->intr[h->intr_mode] = h->pdev->irq;
4109         return;
4110 }
4111
4112 static int __devinit cciss_lookup_board_id(struct pci_dev *pdev, u32 *board_id)
4113 {
4114         int i;
4115         u32 subsystem_vendor_id, subsystem_device_id;
4116
4117         subsystem_vendor_id = pdev->subsystem_vendor;
4118         subsystem_device_id = pdev->subsystem_device;
4119         *board_id = ((subsystem_device_id << 16) & 0xffff0000) |
4120                         subsystem_vendor_id;
4121
4122         for (i = 0; i < ARRAY_SIZE(products); i++)
4123                 if (*board_id == products[i].board_id)
4124                         return i;
4125         dev_warn(&pdev->dev, "unrecognized board ID: 0x%08x, ignoring.\n",
4126                 *board_id);
4127         return -ENODEV;
4128 }
4129
4130 static inline bool cciss_board_disabled(ctlr_info_t *h)
4131 {
4132         u16 command;
4133
4134         (void) pci_read_config_word(h->pdev, PCI_COMMAND, &command);
4135         return ((command & PCI_COMMAND_MEMORY) == 0);
4136 }
4137
4138 static int __devinit cciss_pci_find_memory_BAR(struct pci_dev *pdev,
4139         unsigned long *memory_bar)
4140 {
4141         int i;
4142
4143         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
4144                 if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
4145                         /* addressing mode bits already removed */
4146                         *memory_bar = pci_resource_start(pdev, i);
4147                         dev_dbg(&pdev->dev, "memory BAR = %lx\n",
4148                                 *memory_bar);
4149                         return 0;
4150                 }
4151         dev_warn(&pdev->dev, "no memory BAR found\n");
4152         return -ENODEV;
4153 }
4154
4155 static int __devinit cciss_wait_for_board_state(struct pci_dev *pdev,
4156         void __iomem *vaddr, int wait_for_ready)
4157 #define BOARD_READY 1
4158 #define BOARD_NOT_READY 0
4159 {
4160         int i, iterations;
4161         u32 scratchpad;
4162
4163         if (wait_for_ready)
4164                 iterations = CCISS_BOARD_READY_ITERATIONS;
4165         else
4166                 iterations = CCISS_BOARD_NOT_READY_ITERATIONS;
4167
4168         for (i = 0; i < iterations; i++) {
4169                 scratchpad = readl(vaddr + SA5_SCRATCHPAD_OFFSET);
4170                 if (wait_for_ready) {
4171                         if (scratchpad == CCISS_FIRMWARE_READY)
4172                                 return 0;
4173                 } else {
4174                         if (scratchpad != CCISS_FIRMWARE_READY)
4175                                 return 0;
4176                 }
4177                 msleep(CCISS_BOARD_READY_POLL_INTERVAL_MSECS);
4178         }
4179         dev_warn(&pdev->dev, "board not ready, timed out.\n");
4180         return -ENODEV;
4181 }
4182
4183 static int __devinit cciss_find_cfg_addrs(struct pci_dev *pdev,
4184         void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
4185         u64 *cfg_offset)
4186 {
4187         *cfg_base_addr = readl(vaddr + SA5_CTCFG_OFFSET);
4188         *cfg_offset = readl(vaddr + SA5_CTMEM_OFFSET);
4189         *cfg_base_addr &= (u32) 0x0000ffff;
4190         *cfg_base_addr_index = find_PCI_BAR_index(pdev, *cfg_base_addr);
4191         if (*cfg_base_addr_index == -1) {
4192                 dev_warn(&pdev->dev, "cannot find cfg_base_addr_index, "
4193                         "*cfg_base_addr = 0x%08x\n", *cfg_base_addr);
4194                 return -ENODEV;
4195         }
4196         return 0;
4197 }
4198
4199 static int __devinit cciss_find_cfgtables(ctlr_info_t *h)
4200 {
4201         u64 cfg_offset;
4202         u32 cfg_base_addr;
4203         u64 cfg_base_addr_index;
4204         u32 trans_offset;
4205         int rc;
4206
4207         rc = cciss_find_cfg_addrs(h->pdev, h->vaddr, &cfg_base_addr,
4208                 &cfg_base_addr_index, &cfg_offset);
4209         if (rc)
4210                 return rc;
4211         h->cfgtable = remap_pci_mem(pci_resource_start(h->pdev,
4212                 cfg_base_addr_index) + cfg_offset, sizeof(h->cfgtable));
4213         if (!h->cfgtable)
4214                 return -ENOMEM;
4215         rc = write_driver_ver_to_cfgtable(h->cfgtable);
4216         if (rc)
4217                 return rc;
4218         /* Find performant mode table. */
4219         trans_offset = readl(&h->cfgtable->TransMethodOffset);
4220         h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
4221                                 cfg_base_addr_index)+cfg_offset+trans_offset,
4222                                 sizeof(*h->transtable));
4223         if (!h->transtable)
4224                 return -ENOMEM;
4225         return 0;
4226 }
4227
4228 static void __devinit cciss_get_max_perf_mode_cmds(struct ctlr_info *h)
4229 {
4230         h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
4231
4232         /* Limit commands in memory limited kdump scenario. */
4233         if (reset_devices && h->max_commands > 32)
4234                 h->max_commands = 32;
4235
4236         if (h->max_commands < 16) {
4237                 dev_warn(&h->pdev->dev, "Controller reports "
4238                         "max supported commands of %d, an obvious lie. "
4239                         "Using 16.  Ensure that firmware is up to date.\n",
4240                         h->max_commands);
4241                 h->max_commands = 16;
4242         }
4243 }
4244
4245 /* Interrogate the hardware for some limits:
4246  * max commands, max SG elements without chaining, and with chaining,
4247  * SG chain block size, etc.
4248  */
4249 static void __devinit cciss_find_board_params(ctlr_info_t *h)
4250 {
4251         cciss_get_max_perf_mode_cmds(h);
4252         h->nr_cmds = h->max_commands - 4 - cciss_tape_cmds;
4253         h->maxsgentries = readl(&(h->cfgtable->MaxSGElements));
4254         /*
4255          * Limit in-command s/g elements to 32 save dma'able memory.
4256          * Howvever spec says if 0, use 31
4257          */
4258         h->max_cmd_sgentries = 31;
4259         if (h->maxsgentries > 512) {
4260                 h->max_cmd_sgentries = 32;
4261                 h->chainsize = h->maxsgentries - h->max_cmd_sgentries + 1;
4262                 h->maxsgentries--; /* save one for chain pointer */
4263         } else {
4264                 h->maxsgentries = 31; /* default to traditional values */
4265                 h->chainsize = 0;
4266         }
4267 }
4268
4269 static inline bool CISS_signature_present(ctlr_info_t *h)
4270 {
4271         if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
4272             (readb(&h->cfgtable->Signature[1]) != 'I') ||
4273             (readb(&h->cfgtable->Signature[2]) != 'S') ||
4274             (readb(&h->cfgtable->Signature[3]) != 'S')) {
4275                 dev_warn(&h->pdev->dev, "not a valid CISS config table\n");
4276                 return false;
4277         }
4278         return true;
4279 }
4280
4281 /* Need to enable prefetch in the SCSI core for 6400 in x86 */
4282 static inline void cciss_enable_scsi_prefetch(ctlr_info_t *h)
4283 {
4284 #ifdef CONFIG_X86
4285         u32 prefetch;
4286
4287         prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
4288         prefetch |= 0x100;
4289         writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
4290 #endif
4291 }
4292
4293 /* Disable DMA prefetch for the P600.  Otherwise an ASIC bug may result
4294  * in a prefetch beyond physical memory.
4295  */
4296 static inline void cciss_p600_dma_prefetch_quirk(ctlr_info_t *h)
4297 {
4298         u32 dma_prefetch;
4299         __u32 dma_refetch;
4300
4301         if (h->board_id != 0x3225103C)
4302                 return;
4303         dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
4304         dma_prefetch |= 0x8000;
4305         writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
4306         pci_read_config_dword(h->pdev, PCI_COMMAND_PARITY, &dma_refetch);
4307         dma_refetch |= 0x1;
4308         pci_write_config_dword(h->pdev, PCI_COMMAND_PARITY, dma_refetch);
4309 }
4310
4311 static int __devinit cciss_pci_init(ctlr_info_t *h)
4312 {
4313         int prod_index, err;
4314
4315         prod_index = cciss_lookup_board_id(h->pdev, &h->board_id);
4316         if (prod_index < 0)
4317                 return -ENODEV;
4318         h->product_name = products[prod_index].product_name;
4319         h->access = *(products[prod_index].access);
4320
4321         if (cciss_board_disabled(h)) {
4322                 dev_warn(&h->pdev->dev, "controller appears to be disabled\n");
4323                 return -ENODEV;
4324         }
4325
4326         pci_disable_link_state(h->pdev, PCIE_LINK_STATE_L0S |
4327                                 PCIE_LINK_STATE_L1 | PCIE_LINK_STATE_CLKPM);
4328
4329         err = pci_enable_device(h->pdev);
4330         if (err) {
4331                 dev_warn(&h->pdev->dev, "Unable to Enable PCI device\n");
4332                 return err;
4333         }
4334
4335         err = pci_request_regions(h->pdev, "cciss");
4336         if (err) {
4337                 dev_warn(&h->pdev->dev,
4338                         "Cannot obtain PCI resources, aborting\n");
4339                 return err;
4340         }
4341
4342         dev_dbg(&h->pdev->dev, "irq = %x\n", h->pdev->irq);
4343         dev_dbg(&h->pdev->dev, "board_id = %x\n", h->board_id);
4344
4345 /* If the kernel supports MSI/MSI-X we will try to enable that functionality,
4346  * else we use the IO-APIC interrupt assigned to us by system ROM.
4347  */
4348         cciss_interrupt_mode(h);
4349         err = cciss_pci_find_memory_BAR(h->pdev, &h->paddr);
4350         if (err)
4351                 goto err_out_free_res;
4352         h->vaddr = remap_pci_mem(h->paddr, 0x250);
4353         if (!h->vaddr) {
4354                 err = -ENOMEM;
4355                 goto err_out_free_res;
4356         }
4357         err = cciss_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY);
4358         if (err)
4359                 goto err_out_free_res;
4360         err = cciss_find_cfgtables(h);
4361         if (err)
4362                 goto err_out_free_res;
4363         print_cfg_table(h);
4364         cciss_find_board_params(h);
4365
4366         if (!CISS_signature_present(h)) {
4367                 err = -ENODEV;
4368                 goto err_out_free_res;
4369         }
4370         cciss_enable_scsi_prefetch(h);
4371         cciss_p600_dma_prefetch_quirk(h);
4372         err = cciss_enter_simple_mode(h);
4373         if (err)
4374                 goto err_out_free_res;
4375         cciss_put_controller_into_performant_mode(h);
4376         return 0;
4377
4378 err_out_free_res:
4379         /*
4380          * Deliberately omit pci_disable_device(): it does something nasty to
4381          * Smart Array controllers that pci_enable_device does not undo
4382          */
4383         if (h->transtable)
4384                 iounmap(h->transtable);
4385         if (h->cfgtable)
4386                 iounmap(h->cfgtable);
4387         if (h->vaddr)
4388                 iounmap(h->vaddr);
4389         pci_release_regions(h->pdev);
4390         return err;
4391 }
4392
4393 /* Function to find the first free pointer into our hba[] array
4394  * Returns -1 if no free entries are left.
4395  */
4396 static int alloc_cciss_hba(struct pci_dev *pdev)
4397 {
4398         int i;
4399
4400         for (i = 0; i < MAX_CTLR; i++) {
4401                 if (!hba[i]) {
4402                         ctlr_info_t *h;
4403
4404                         h = kzalloc(sizeof(ctlr_info_t), GFP_KERNEL);
4405                         if (!h)
4406                                 goto Enomem;
4407                         hba[i] = h;
4408                         return i;
4409                 }
4410         }
4411         dev_warn(&pdev->dev, "This driver supports a maximum"
4412                " of %d controllers.\n", MAX_CTLR);
4413         return -1;
4414 Enomem:
4415         dev_warn(&pdev->dev, "out of memory.\n");
4416         return -1;
4417 }
4418
4419 static void free_hba(ctlr_info_t *h)
4420 {
4421         int i;
4422
4423         hba[h->ctlr] = NULL;
4424         for (i = 0; i < h->highest_lun + 1; i++)
4425                 if (h->gendisk[i] != NULL)
4426                         put_disk(h->gendisk[i]);
4427         kfree(h);
4428 }
4429
4430 /* Send a message CDB to the firmware. */
4431 static __devinit int cciss_message(struct pci_dev *pdev, unsigned char opcode, unsigned char type)
4432 {
4433         typedef struct {
4434                 CommandListHeader_struct CommandHeader;
4435                 RequestBlock_struct Request;
4436                 ErrDescriptor_struct ErrorDescriptor;
4437         } Command;
4438         static const size_t cmd_sz = sizeof(Command) + sizeof(ErrorInfo_struct);
4439         Command *cmd;
4440         dma_addr_t paddr64;
4441         uint32_t paddr32, tag;
4442         void __iomem *vaddr;
4443         int i, err;
4444
4445         vaddr = ioremap_nocache(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
4446         if (vaddr == NULL)
4447                 return -ENOMEM;
4448
4449         /* The Inbound Post Queue only accepts 32-bit physical addresses for the
4450            CCISS commands, so they must be allocated from the lower 4GiB of
4451            memory. */
4452         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
4453         if (err) {
4454                 iounmap(vaddr);
4455                 return -ENOMEM;
4456         }
4457
4458         cmd = pci_alloc_consistent(pdev, cmd_sz, &paddr64);
4459         if (cmd == NULL) {
4460                 iounmap(vaddr);
4461                 return -ENOMEM;
4462         }
4463
4464         /* This must fit, because of the 32-bit consistent DMA mask.  Also,
4465            although there's no guarantee, we assume that the address is at
4466            least 4-byte aligned (most likely, it's page-aligned). */
4467         paddr32 = paddr64;
4468
4469         cmd->CommandHeader.ReplyQueue = 0;
4470         cmd->CommandHeader.SGList = 0;
4471         cmd->CommandHeader.SGTotal = 0;
4472         cmd->CommandHeader.Tag.lower = paddr32;
4473         cmd->CommandHeader.Tag.upper = 0;
4474         memset(&cmd->CommandHeader.LUN.LunAddrBytes, 0, 8);
4475
4476         cmd->Request.CDBLen = 16;
4477         cmd->Request.Type.Type = TYPE_MSG;
4478         cmd->Request.Type.Attribute = ATTR_HEADOFQUEUE;
4479         cmd->Request.Type.Direction = XFER_NONE;
4480         cmd->Request.Timeout = 0; /* Don't time out */
4481         cmd->Request.CDB[0] = opcode;
4482         cmd->Request.CDB[1] = type;
4483         memset(&cmd->Request.CDB[2], 0, 14); /* the rest of the CDB is reserved */
4484
4485         cmd->ErrorDescriptor.Addr.lower = paddr32 + sizeof(Command);
4486         cmd->ErrorDescriptor.Addr.upper = 0;
4487         cmd->ErrorDescriptor.Len = sizeof(ErrorInfo_struct);
4488
4489         writel(paddr32, vaddr + SA5_REQUEST_PORT_OFFSET);
4490
4491         for (i = 0; i < 10; i++) {
4492                 tag = readl(vaddr + SA5_REPLY_PORT_OFFSET);
4493                 if ((tag & ~3) == paddr32)
4494                         break;
4495                 msleep(CCISS_POST_RESET_NOOP_TIMEOUT_MSECS);
4496         }
4497
4498         iounmap(vaddr);
4499
4500         /* we leak the DMA buffer here ... no choice since the controller could
4501            still complete the command. */
4502         if (i == 10) {
4503                 dev_err(&pdev->dev,
4504                         "controller message %02x:%02x timed out\n",
4505                         opcode, type);
4506                 return -ETIMEDOUT;
4507         }
4508
4509         pci_free_consistent(pdev, cmd_sz, cmd, paddr64);
4510
4511         if (tag & 2) {
4512                 dev_err(&pdev->dev, "controller message %02x:%02x failed\n",
4513                         opcode, type);
4514                 return -EIO;
4515         }
4516
4517         dev_info(&pdev->dev, "controller message %02x:%02x succeeded\n",
4518                 opcode, type);
4519         return 0;
4520 }
4521
4522 #define cciss_noop(p) cciss_message(p, 3, 0)
4523
4524 static int cciss_controller_hard_reset(struct pci_dev *pdev,
4525         void * __iomem vaddr, u32 use_doorbell)
4526 {
4527         u16 pmcsr;
4528         int pos;
4529
4530         if (use_doorbell) {
4531                 /* For everything after the P600, the PCI power state method
4532                  * of resetting the controller doesn't work, so we have this
4533                  * other way using the doorbell register.
4534                  */
4535                 dev_info(&pdev->dev, "using doorbell to reset controller\n");
4536                 writel(use_doorbell, vaddr + SA5_DOORBELL);
4537         } else { /* Try to do it the PCI power state way */
4538
4539                 /* Quoting from the Open CISS Specification: "The Power
4540                  * Management Control/Status Register (CSR) controls the power
4541                  * state of the device.  The normal operating state is D0,
4542                  * CSR=00h.  The software off state is D3, CSR=03h.  To reset
4543                  * the controller, place the interface device in D3 then to D0,
4544                  * this causes a secondary PCI reset which will reset the
4545                  * controller." */
4546
4547                 pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
4548                 if (pos == 0) {
4549                         dev_err(&pdev->dev,
4550                                 "cciss_controller_hard_reset: "
4551                                 "PCI PM not supported\n");
4552                         return -ENODEV;
4553                 }
4554                 dev_info(&pdev->dev, "using PCI PM to reset controller\n");
4555                 /* enter the D3hot power management state */
4556                 pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
4557                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
4558                 pmcsr |= PCI_D3hot;
4559                 pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
4560
4561                 msleep(500);
4562
4563                 /* enter the D0 power management state */
4564                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
4565                 pmcsr |= PCI_D0;
4566                 pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
4567
4568                 /*
4569                  * The P600 requires a small delay when changing states.
4570                  * Otherwise we may think the board did not reset and we bail.
4571                  * This for kdump only and is particular to the P600.
4572                  */
4573                 msleep(500);
4574         }
4575         return 0;
4576 }
4577
4578 static __devinit void init_driver_version(char *driver_version, int len)
4579 {
4580         memset(driver_version, 0, len);
4581         strncpy(driver_version, "cciss " DRIVER_NAME, len - 1);
4582 }
4583
4584 static __devinit int write_driver_ver_to_cfgtable(
4585         CfgTable_struct __iomem *cfgtable)
4586 {
4587         char *driver_version;
4588         int i, size = sizeof(cfgtable->driver_version);
4589
4590         driver_version = kmalloc(size, GFP_KERNEL);
4591         if (!driver_version)
4592                 return -ENOMEM;
4593
4594         init_driver_version(driver_version, size);
4595         for (i = 0; i < size; i++)
4596                 writeb(driver_version[i], &cfgtable->driver_version[i]);
4597         kfree(driver_version);
4598         return 0;
4599 }
4600
4601 static __devinit void read_driver_ver_from_cfgtable(
4602         CfgTable_struct __iomem *cfgtable, unsigned char *driver_ver)
4603 {
4604         int i;
4605
4606         for (i = 0; i < sizeof(cfgtable->driver_version); i++)
4607                 driver_ver[i] = readb(&cfgtable->driver_version[i]);
4608 }
4609
4610 static __devinit int controller_reset_failed(
4611         CfgTable_struct __iomem *cfgtable)
4612 {
4613
4614         char *driver_ver, *old_driver_ver;
4615         int rc, size = sizeof(cfgtable->driver_version);
4616
4617         old_driver_ver = kmalloc(2 * size, GFP_KERNEL);
4618         if (!old_driver_ver)
4619                 return -ENOMEM;
4620         driver_ver = old_driver_ver + size;
4621
4622         /* After a reset, the 32 bytes of "driver version" in the cfgtable
4623          * should have been changed, otherwise we know the reset failed.
4624          */
4625         init_driver_version(old_driver_ver, size);
4626         read_driver_ver_from_cfgtable(cfgtable, driver_ver);
4627         rc = !memcmp(driver_ver, old_driver_ver, size);
4628         kfree(old_driver_ver);
4629         return rc;
4630 }
4631
4632 /* This does a hard reset of the controller using PCI power management
4633  * states or using the doorbell register. */
4634 static __devinit int cciss_kdump_hard_reset_controller(struct pci_dev *pdev)
4635 {
4636         u64 cfg_offset;
4637         u32 cfg_base_addr;
4638         u64 cfg_base_addr_index;
4639         void __iomem *vaddr;
4640         unsigned long paddr;
4641         u32 misc_fw_support;
4642         int rc;
4643         CfgTable_struct __iomem *cfgtable;
4644         u32 use_doorbell;
4645         u32 board_id;
4646         u16 command_register;
4647
4648         /* For controllers as old a the p600, this is very nearly
4649          * the same thing as
4650          *
4651          * pci_save_state(pci_dev);
4652          * pci_set_power_state(pci_dev, PCI_D3hot);
4653          * pci_set_power_state(pci_dev, PCI_D0);
4654          * pci_restore_state(pci_dev);
4655          *
4656          * For controllers newer than the P600, the pci power state
4657          * method of resetting doesn't work so we have another way
4658          * using the doorbell register.
4659          */
4660
4661         /* Exclude 640x boards.  These are two pci devices in one slot
4662          * which share a battery backed cache module.  One controls the
4663          * cache, the other accesses the cache through the one that controls
4664          * it.  If we reset the one controlling the cache, the other will
4665          * likely not be happy.  Just forbid resetting this conjoined mess.
4666          */
4667         cciss_lookup_board_id(pdev, &board_id);
4668         if (!ctlr_is_resettable(board_id)) {
4669                 dev_warn(&pdev->dev, "Cannot reset Smart Array 640x "
4670                                 "due to shared cache module.");
4671                 return -ENODEV;
4672         }
4673
4674         /* if controller is soft- but not hard resettable... */
4675         if (!ctlr_is_hard_resettable(board_id))
4676                 return -ENOTSUPP; /* try soft reset later. */
4677
4678         /* Save the PCI command register */
4679         pci_read_config_word(pdev, 4, &command_register);
4680         /* Turn the board off.  This is so that later pci_restore_state()
4681          * won't turn the board on before the rest of config space is ready.
4682          */
4683         pci_disable_device(pdev);
4684         pci_save_state(pdev);
4685
4686         /* find the first memory BAR, so we can find the cfg table */
4687         rc = cciss_pci_find_memory_BAR(pdev, &paddr);
4688         if (rc)
4689                 return rc;
4690         vaddr = remap_pci_mem(paddr, 0x250);
4691         if (!vaddr)
4692                 return -ENOMEM;
4693
4694         /* find cfgtable in order to check if reset via doorbell is supported */
4695         rc = cciss_find_cfg_addrs(pdev, vaddr, &cfg_base_addr,
4696                                         &cfg_base_addr_index, &cfg_offset);
4697         if (rc)
4698                 goto unmap_vaddr;
4699         cfgtable = remap_pci_mem(pci_resource_start(pdev,
4700                        cfg_base_addr_index) + cfg_offset, sizeof(*cfgtable));
4701         if (!cfgtable) {
4702                 rc = -ENOMEM;
4703                 goto unmap_vaddr;
4704         }
4705         rc = write_driver_ver_to_cfgtable(cfgtable);
4706         if (rc)
4707                 goto unmap_vaddr;
4708
4709         /* If reset via doorbell register is supported, use that.
4710          * There are two such methods.  Favor the newest method.
4711          */
4712         misc_fw_support = readl(&cfgtable->misc_fw_support);
4713         use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET2;
4714         if (use_doorbell) {
4715                 use_doorbell = DOORBELL_CTLR_RESET2;
4716         } else {
4717                 use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
4718                 if (use_doorbell) {
4719                         dev_warn(&pdev->dev, "Controller claims that "
4720                                 "'Bit 2 doorbell reset' is "
4721                                 "supported, but not 'bit 5 doorbell reset'.  "
4722                                 "Firmware update is recommended.\n");
4723                         rc = -ENOTSUPP; /* use the soft reset */
4724                         goto unmap_cfgtable;
4725                 }
4726         }
4727
4728         rc = cciss_controller_hard_reset(pdev, vaddr, use_doorbell);
4729         if (rc)
4730                 goto unmap_cfgtable;
4731         pci_restore_state(pdev);
4732         rc = pci_enable_device(pdev);
4733         if (rc) {
4734                 dev_warn(&pdev->dev, "failed to enable device.\n");
4735                 goto unmap_cfgtable;
4736         }
4737         pci_write_config_word(pdev, 4, command_register);
4738
4739         /* Some devices (notably the HP Smart Array 5i Controller)
4740            need a little pause here */
4741         msleep(CCISS_POST_RESET_PAUSE_MSECS);
4742
4743         /* Wait for board to become not ready, then ready. */
4744         dev_info(&pdev->dev, "Waiting for board to reset.\n");
4745         rc = cciss_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY);
4746         if (rc) {
4747                 dev_warn(&pdev->dev, "Failed waiting for board to hard reset."
4748                                 "  Will try soft reset.\n");
4749                 rc = -ENOTSUPP; /* Not expected, but try soft reset later */
4750                 goto unmap_cfgtable;
4751         }
4752         rc = cciss_wait_for_board_state(pdev, vaddr, BOARD_READY);
4753         if (rc) {
4754                 dev_warn(&pdev->dev,
4755                         "failed waiting for board to become ready "
4756                         "after hard reset\n");
4757                 goto unmap_cfgtable;
4758         }
4759
4760         rc = controller_reset_failed(vaddr);
4761         if (rc < 0)
4762                 goto unmap_cfgtable;
4763         if (rc) {
4764                 dev_warn(&pdev->dev, "Unable to successfully hard reset "
4765                         "controller. Will try soft reset.\n");
4766                 rc = -ENOTSUPP; /* Not expected, but try soft reset later */
4767         } else {
4768                 dev_info(&pdev->dev, "Board ready after hard reset.\n");
4769         }
4770
4771 unmap_cfgtable:
4772         iounmap(cfgtable);
4773
4774 unmap_vaddr:
4775         iounmap(vaddr);
4776         return rc;
4777 }
4778
4779 static __devinit int cciss_init_reset_devices(struct pci_dev *pdev)
4780 {
4781         int rc, i;
4782
4783         if (!reset_devices)
4784                 return 0;
4785
4786         /* Reset the controller with a PCI power-cycle or via doorbell */
4787         rc = cciss_kdump_hard_reset_controller(pdev);
4788
4789         /* -ENOTSUPP here means we cannot reset the controller
4790          * but it's already (and still) up and running in
4791          * "performant mode".  Or, it might be 640x, which can't reset
4792          * due to concerns about shared bbwc between 6402/6404 pair.
4793          */
4794         if (rc == -ENOTSUPP)
4795                 return rc; /* just try to do the kdump anyhow. */
4796         if (rc)
4797                 return -ENODEV;
4798
4799         /* Now try to get the controller to respond to a no-op */
4800         dev_warn(&pdev->dev, "Waiting for controller to respond to no-op\n");
4801         for (i = 0; i < CCISS_POST_RESET_NOOP_RETRIES; i++) {
4802                 if (cciss_noop(pdev) == 0)
4803                         break;
4804                 else
4805                         dev_warn(&pdev->dev, "no-op failed%s\n",
4806                                 (i < CCISS_POST_RESET_NOOP_RETRIES - 1 ?
4807                                         "; re-trying" : ""));
4808                 msleep(CCISS_POST_RESET_NOOP_INTERVAL_MSECS);
4809         }
4810         return 0;
4811 }
4812
4813 static __devinit int cciss_allocate_cmd_pool(ctlr_info_t *h)
4814 {
4815         h->cmd_pool_bits = kmalloc(
4816                 DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG) *
4817                 sizeof(unsigned long), GFP_KERNEL);
4818         h->cmd_pool = pci_alloc_consistent(h->pdev,
4819                 h->nr_cmds * sizeof(CommandList_struct),
4820                 &(h->cmd_pool_dhandle));
4821         h->errinfo_pool = pci_alloc_consistent(h->pdev,
4822                 h->nr_cmds * sizeof(ErrorInfo_struct),
4823                 &(h->errinfo_pool_dhandle));
4824         if ((h->cmd_pool_bits == NULL)
4825                 || (h->cmd_pool == NULL)
4826                 || (h->errinfo_pool == NULL)) {
4827                 dev_err(&h->pdev->dev, "out of memory");
4828                 return -ENOMEM;
4829         }
4830         return 0;
4831 }
4832
4833 static __devinit int cciss_allocate_scatterlists(ctlr_info_t *h)
4834 {
4835         int i;
4836
4837         /* zero it, so that on free we need not know how many were alloc'ed */
4838         h->scatter_list = kzalloc(h->max_commands *
4839                                 sizeof(struct scatterlist *), GFP_KERNEL);
4840         if (!h->scatter_list)
4841                 return -ENOMEM;
4842
4843         for (i = 0; i < h->nr_cmds; i++) {
4844                 h->scatter_list[i] = kmalloc(sizeof(struct scatterlist) *
4845                                                 h->maxsgentries, GFP_KERNEL);
4846                 if (h->scatter_list[i] == NULL) {
4847                         dev_err(&h->pdev->dev, "could not allocate "
4848                                 "s/g lists\n");
4849                         return -ENOMEM;
4850                 }
4851         }
4852         return 0;
4853 }
4854
4855 static void cciss_free_scatterlists(ctlr_info_t *h)
4856 {
4857         int i;
4858
4859         if (h->scatter_list) {
4860                 for (i = 0; i < h->nr_cmds; i++)
4861                         kfree(h->scatter_list[i]);
4862                 kfree(h->scatter_list);
4863         }
4864 }
4865
4866 static void cciss_free_cmd_pool(ctlr_info_t *h)
4867 {
4868         kfree(h->cmd_pool_bits);
4869         if (h->cmd_pool)
4870                 pci_free_consistent(h->pdev,
4871                         h->nr_cmds * sizeof(CommandList_struct),
4872                         h->cmd_pool, h->cmd_pool_dhandle);
4873         if (h->errinfo_pool)
4874                 pci_free_consistent(h->pdev,
4875                         h->nr_cmds * sizeof(ErrorInfo_struct),
4876                         h->errinfo_pool, h->errinfo_pool_dhandle);
4877 }
4878
4879 static int cciss_request_irq(ctlr_info_t *h,
4880         irqreturn_t (*msixhandler)(int, void *),
4881         irqreturn_t (*intxhandler)(int, void *))
4882 {
4883         if (h->msix_vector || h->msi_vector) {
4884                 if (!request_irq(h->intr[h->intr_mode], msixhandler,
4885                                 0, h->devname, h))
4886                         return 0;
4887                 dev_err(&h->pdev->dev, "Unable to get msi irq %d"
4888                         " for %s\n", h->intr[h->intr_mode],
4889                         h->devname);
4890                 return -1;
4891         }
4892
4893         if (!request_irq(h->intr[h->intr_mode], intxhandler,
4894                         IRQF_SHARED, h->devname, h))
4895                 return 0;
4896         dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n",
4897                 h->intr[h->intr_mode], h->devname);
4898         return -1;
4899 }
4900
4901 static int __devinit cciss_kdump_soft_reset(ctlr_info_t *h)
4902 {
4903         if (cciss_send_reset(h, CTLR_LUNID, CCISS_RESET_TYPE_CONTROLLER)) {
4904                 dev_warn(&h->pdev->dev, "Resetting array controller failed.\n");
4905                 return -EIO;
4906         }
4907
4908         dev_info(&h->pdev->dev, "Waiting for board to soft reset.\n");
4909         if (cciss_wait_for_board_state(h->pdev, h->vaddr, BOARD_NOT_READY)) {
4910                 dev_warn(&h->pdev->dev, "Soft reset had no effect.\n");
4911                 return -1;
4912         }
4913
4914         dev_info(&h->pdev->dev, "Board reset, awaiting READY status.\n");
4915         if (cciss_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY)) {
4916                 dev_warn(&h->pdev->dev, "Board failed to become ready "
4917                         "after soft reset.\n");
4918                 return -1;
4919         }
4920
4921         return 0;
4922 }
4923
4924 static void cciss_undo_allocations_after_kdump_soft_reset(ctlr_info_t *h)
4925 {
4926         int ctlr = h->ctlr;
4927
4928         free_irq(h->intr[h->intr_mode], h);
4929 #ifdef CONFIG_PCI_MSI
4930         if (h->msix_vector)
4931                 pci_disable_msix(h->pdev);
4932         else if (h->msi_vector)
4933                 pci_disable_msi(h->pdev);
4934 #endif /* CONFIG_PCI_MSI */
4935         cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
4936         cciss_free_scatterlists(h);
4937         cciss_free_cmd_pool(h);
4938         kfree(h->blockFetchTable);
4939         if (h->reply_pool)
4940                 pci_free_consistent(h->pdev, h->max_commands * sizeof(__u64),
4941                                 h->reply_pool, h->reply_pool_dhandle);
4942         if (h->transtable)
4943                 iounmap(h->transtable);
4944         if (h->cfgtable)
4945                 iounmap(h->cfgtable);
4946         if (h->vaddr)
4947                 iounmap(h->vaddr);
4948         unregister_blkdev(h->major, h->devname);
4949         cciss_destroy_hba_sysfs_entry(h);
4950         pci_release_regions(h->pdev);
4951         kfree(h);
4952         hba[ctlr] = NULL;
4953 }
4954
4955 /*
4956  *  This is it.  Find all the controllers and register them.  I really hate
4957  *  stealing all these major device numbers.
4958  *  returns the number of block devices registered.
4959  */
4960 static int __devinit cciss_init_one(struct pci_dev *pdev,
4961                                     const struct pci_device_id *ent)
4962 {
4963         int i;
4964         int j = 0;
4965         int rc;
4966         int try_soft_reset = 0;
4967         int dac, return_code;
4968         InquiryData_struct *inq_buff;
4969         ctlr_info_t *h;
4970         unsigned long flags;
4971
4972         rc = cciss_init_reset_devices(pdev);
4973         if (rc) {
4974                 if (rc != -ENOTSUPP)
4975                         return rc;
4976                 /* If the reset fails in a particular way (it has no way to do
4977                  * a proper hard reset, so returns -ENOTSUPP) we can try to do
4978                  * a soft reset once we get the controller configured up to the
4979                  * point that it can accept a command.
4980                  */
4981                 try_soft_reset = 1;
4982                 rc = 0;
4983         }
4984
4985 reinit_after_soft_reset:
4986
4987         i = alloc_cciss_hba(pdev);
4988         if (i < 0)
4989                 return -1;
4990
4991         h = hba[i];
4992         h->pdev = pdev;
4993         h->busy_initializing = 1;
4994         h->intr_mode = cciss_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
4995         INIT_LIST_HEAD(&h->cmpQ);
4996         INIT_LIST_HEAD(&h->reqQ);
4997         mutex_init(&h->busy_shutting_down);
4998
4999         if (cciss_pci_init(h) != 0)
5000                 goto clean_no_release_regions;
5001
5002         sprintf(h->devname, "cciss%d", i);
5003         h->ctlr = i;
5004
5005         if (cciss_tape_cmds < 2)
5006                 cciss_tape_cmds = 2;
5007         if (cciss_tape_cmds > 16)
5008                 cciss_tape_cmds = 16;
5009
5010         init_completion(&h->scan_wait);
5011
5012         if (cciss_create_hba_sysfs_entry(h))
5013                 goto clean0;
5014
5015         /* configure PCI DMA stuff */
5016         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5017                 dac = 1;
5018         else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))
5019                 dac = 0;
5020         else {
5021                 dev_err(&h->pdev->dev, "no suitable DMA available\n");
5022                 goto clean1;
5023         }
5024
5025         /*
5026          * register with the major number, or get a dynamic major number
5027          * by passing 0 as argument.  This is done for greater than
5028          * 8 controller support.
5029          */
5030         if (i < MAX_CTLR_ORIG)
5031                 h->major = COMPAQ_CISS_MAJOR + i;
5032         rc = register_blkdev(h->major, h->devname);
5033         if (rc == -EBUSY || rc == -EINVAL) {
5034                 dev_err(&h->pdev->dev,
5035                        "Unable to get major number %d for %s "
5036                        "on hba %d\n", h->major, h->devname, i);
5037                 goto clean1;
5038         } else {
5039                 if (i >= MAX_CTLR_ORIG)
5040                         h->major = rc;
5041         }
5042
5043         /* make sure the board interrupts are off */
5044         h->access.set_intr_mask(h, CCISS_INTR_OFF);
5045         rc = cciss_request_irq(h, do_cciss_msix_intr, do_cciss_intx);
5046         if (rc)
5047                 goto clean2;
5048
5049         dev_info(&h->pdev->dev, "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n",
5050                h->devname, pdev->device, pci_name(pdev),
5051                h->intr[h->intr_mode], dac ? "" : " not");
5052
5053         if (cciss_allocate_cmd_pool(h))
5054                 goto clean4;
5055
5056         if (cciss_allocate_scatterlists(h))
5057                 goto clean4;
5058
5059         h->cmd_sg_list = cciss_allocate_sg_chain_blocks(h,
5060                 h->chainsize, h->nr_cmds);
5061         if (!h->cmd_sg_list && h->chainsize > 0)
5062                 goto clean4;
5063
5064         spin_lock_init(&h->lock);
5065
5066         /* Initialize the pdev driver private data.
5067            have it point to h.  */
5068         pci_set_drvdata(pdev, h);
5069         /* command and error info recs zeroed out before
5070            they are used */
5071         memset(h->cmd_pool_bits, 0,
5072                DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG)
5073                         * sizeof(unsigned long));
5074
5075         h->num_luns = 0;
5076         h->highest_lun = -1;
5077         for (j = 0; j < CISS_MAX_LUN; j++) {
5078                 h->drv[j] = NULL;
5079                 h->gendisk[j] = NULL;
5080         }
5081
5082         /* At this point, the controller is ready to take commands.
5083          * Now, if reset_devices and the hard reset didn't work, try
5084          * the soft reset and see if that works.
5085          */
5086         if (try_soft_reset) {
5087
5088                 /* This is kind of gross.  We may or may not get a completion
5089                  * from the soft reset command, and if we do, then the value
5090                  * from the fifo may or may not be valid.  So, we wait 10 secs
5091                  * after the reset throwing away any completions we get during
5092                  * that time.  Unregister the interrupt handler and register
5093                  * fake ones to scoop up any residual completions.
5094                  */
5095                 spin_lock_irqsave(&h->lock, flags);
5096                 h->access.set_intr_mask(h, CCISS_INTR_OFF);
5097                 spin_unlock_irqrestore(&h->lock, flags);
5098                 free_irq(h->intr[h->intr_mode], h);
5099                 rc = cciss_request_irq(h, cciss_msix_discard_completions,
5100                                         cciss_intx_discard_completions);
5101                 if (rc) {
5102                         dev_warn(&h->pdev->dev, "Failed to request_irq after "
5103                                 "soft reset.\n");
5104                         goto clean4;
5105                 }
5106
5107                 rc = cciss_kdump_soft_reset(h);
5108                 if (rc) {
5109                         dev_warn(&h->pdev->dev, "Soft reset failed.\n");
5110                         goto clean4;
5111                 }
5112
5113                 dev_info(&h->pdev->dev, "Board READY.\n");
5114                 dev_info(&h->pdev->dev,
5115                         "Waiting for stale completions to drain.\n");
5116                 h->access.set_intr_mask(h, CCISS_INTR_ON);
5117                 msleep(10000);
5118                 h->access.set_intr_mask(h, CCISS_INTR_OFF);
5119
5120                 rc = controller_reset_failed(h->cfgtable);
5121                 if (rc)
5122                         dev_info(&h->pdev->dev,
5123                                 "Soft reset appears to have failed.\n");
5124
5125                 /* since the controller's reset, we have to go back and re-init
5126                  * everything.  Easiest to just forget what we've done and do it
5127                  * all over again.
5128                  */
5129                 cciss_undo_allocations_after_kdump_soft_reset(h);
5130                 try_soft_reset = 0;
5131                 if (rc)
5132                         /* don't go to clean4, we already unallocated */
5133                         return -ENODEV;
5134
5135                 goto reinit_after_soft_reset;
5136         }
5137
5138         cciss_scsi_setup(h);
5139
5140         /* Turn the interrupts on so we can service requests */
5141         h->access.set_intr_mask(h, CCISS_INTR_ON);
5142
5143         /* Get the firmware version */
5144         inq_buff = kzalloc(sizeof(InquiryData_struct), GFP_KERNEL);
5145         if (inq_buff == NULL) {
5146                 dev_err(&h->pdev->dev, "out of memory\n");
5147                 goto clean4;
5148         }
5149
5150         return_code = sendcmd_withirq(h, CISS_INQUIRY, inq_buff,
5151                 sizeof(InquiryData_struct), 0, CTLR_LUNID, TYPE_CMD);
5152         if (return_code == IO_OK) {
5153                 h->firm_ver[0] = inq_buff->data_byte[32];
5154                 h->firm_ver[1] = inq_buff->data_byte[33];
5155                 h->firm_ver[2] = inq_buff->data_byte[34];
5156                 h->firm_ver[3] = inq_buff->data_byte[35];
5157         } else {         /* send command failed */
5158                 dev_warn(&h->pdev->dev, "unable to determine firmware"
5159                         " version of controller\n");
5160         }
5161         kfree(inq_buff);
5162
5163         cciss_procinit(h);
5164
5165         h->cciss_max_sectors = 8192;
5166
5167         rebuild_lun_table(h, 1, 0);
5168         cciss_engage_scsi(h);
5169         h->busy_initializing = 0;
5170         return 1;
5171
5172 clean4:
5173         cciss_free_cmd_pool(h);
5174         cciss_free_scatterlists(h);
5175         cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
5176         free_irq(h->intr[h->intr_mode], h);
5177 clean2:
5178         unregister_blkdev(h->major, h->devname);
5179 clean1:
5180         cciss_destroy_hba_sysfs_entry(h);
5181 clean0:
5182         pci_release_regions(pdev);
5183 clean_no_release_regions:
5184         h->busy_initializing = 0;
5185
5186         /*
5187          * Deliberately omit pci_disable_device(): it does something nasty to
5188          * Smart Array controllers that pci_enable_device does not undo
5189          */
5190         pci_set_drvdata(pdev, NULL);
5191         free_hba(h);
5192         return -1;
5193 }
5194
5195 static void cciss_shutdown(struct pci_dev *pdev)
5196 {
5197         ctlr_info_t *h;
5198         char *flush_buf;
5199         int return_code;
5200
5201         h = pci_get_drvdata(pdev);
5202         flush_buf = kzalloc(4, GFP_KERNEL);
5203         if (!flush_buf) {
5204                 dev_warn(&h->pdev->dev, "cache not flushed, out of memory.\n");
5205                 return;
5206         }
5207         /* write all data in the battery backed cache to disk */
5208         memset(flush_buf, 0, 4);
5209         return_code = sendcmd_withirq(h, CCISS_CACHE_FLUSH, flush_buf,
5210                 4, 0, CTLR_LUNID, TYPE_CMD);
5211         kfree(flush_buf);
5212         if (return_code != IO_OK)
5213                 dev_warn(&h->pdev->dev, "Error flushing cache\n");
5214         h->access.set_intr_mask(h, CCISS_INTR_OFF);
5215         free_irq(h->intr[h->intr_mode], h);
5216 }
5217
5218 static int __devinit cciss_enter_simple_mode(struct ctlr_info *h)
5219 {
5220         u32 trans_support;
5221
5222         trans_support = readl(&(h->cfgtable->TransportSupport));
5223         if (!(trans_support & SIMPLE_MODE))
5224                 return -ENOTSUPP;
5225
5226         h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
5227         writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
5228         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
5229         cciss_wait_for_mode_change_ack(h);
5230         print_cfg_table(h);
5231         if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
5232                 dev_warn(&h->pdev->dev, "unable to get board into simple mode\n");
5233                 return -ENODEV;
5234         }
5235         h->transMethod = CFGTBL_Trans_Simple;
5236         return 0;
5237 }
5238
5239
5240 static void __devexit cciss_remove_one(struct pci_dev *pdev)
5241 {
5242         ctlr_info_t *h;
5243         int i, j;
5244
5245         if (pci_get_drvdata(pdev) == NULL) {
5246                 dev_err(&pdev->dev, "Unable to remove device\n");
5247                 return;
5248         }
5249
5250         h = pci_get_drvdata(pdev);
5251         i = h->ctlr;
5252         if (hba[i] == NULL) {
5253                 dev_err(&pdev->dev, "device appears to already be removed\n");
5254                 return;
5255         }
5256
5257         mutex_lock(&h->busy_shutting_down);
5258
5259         remove_from_scan_list(h);
5260         remove_proc_entry(h->devname, proc_cciss);
5261         unregister_blkdev(h->major, h->devname);
5262
5263         /* remove it from the disk list */
5264         for (j = 0; j < CISS_MAX_LUN; j++) {
5265                 struct gendisk *disk = h->gendisk[j];
5266                 if (disk) {
5267                         struct request_queue *q = disk->queue;
5268
5269                         if (disk->flags & GENHD_FL_UP) {
5270                                 cciss_destroy_ld_sysfs_entry(h, j, 1);
5271                                 del_gendisk(disk);
5272                         }
5273                         if (q)
5274                                 blk_cleanup_queue(q);
5275                 }
5276         }
5277
5278 #ifdef CONFIG_CISS_SCSI_TAPE
5279         cciss_unregister_scsi(h);       /* unhook from SCSI subsystem */
5280 #endif
5281
5282         cciss_shutdown(pdev);
5283
5284 #ifdef CONFIG_PCI_MSI
5285         if (h->msix_vector)
5286                 pci_disable_msix(h->pdev);
5287         else if (h->msi_vector)
5288                 pci_disable_msi(h->pdev);
5289 #endif                          /* CONFIG_PCI_MSI */
5290
5291         iounmap(h->transtable);
5292         iounmap(h->cfgtable);
5293         iounmap(h->vaddr);
5294
5295         cciss_free_cmd_pool(h);
5296         /* Free up sg elements */
5297         for (j = 0; j < h->nr_cmds; j++)
5298                 kfree(h->scatter_list[j]);
5299         kfree(h->scatter_list);
5300         cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
5301         kfree(h->blockFetchTable);
5302         if (h->reply_pool)
5303                 pci_free_consistent(h->pdev, h->max_commands * sizeof(__u64),
5304                                 h->reply_pool, h->reply_pool_dhandle);
5305         /*
5306          * Deliberately omit pci_disable_device(): it does something nasty to
5307          * Smart Array controllers that pci_enable_device does not undo
5308          */
5309         pci_release_regions(pdev);
5310         pci_set_drvdata(pdev, NULL);
5311         cciss_destroy_hba_sysfs_entry(h);
5312         mutex_unlock(&h->busy_shutting_down);
5313         free_hba(h);
5314 }
5315
5316 static struct pci_driver cciss_pci_driver = {
5317         .name = "cciss",
5318         .probe = cciss_init_one,
5319         .remove = __devexit_p(cciss_remove_one),
5320         .id_table = cciss_pci_device_id,        /* id_table */
5321         .shutdown = cciss_shutdown,
5322 };
5323
5324 /*
5325  *  This is it.  Register the PCI driver information for the cards we control
5326  *  the OS will call our registered routines when it finds one of our cards.
5327  */
5328 static int __init cciss_init(void)
5329 {
5330         int err;
5331
5332         /*
5333          * The hardware requires that commands are aligned on a 64-bit
5334          * boundary. Given that we use pci_alloc_consistent() to allocate an
5335          * array of them, the size must be a multiple of 8 bytes.
5336          */
5337         BUILD_BUG_ON(sizeof(CommandList_struct) % COMMANDLIST_ALIGNMENT);
5338         printk(KERN_INFO DRIVER_NAME "\n");
5339
5340         err = bus_register(&cciss_bus_type);
5341         if (err)
5342                 return err;
5343
5344         /* Start the scan thread */
5345         cciss_scan_thread = kthread_run(scan_thread, NULL, "cciss_scan");
5346         if (IS_ERR(cciss_scan_thread)) {
5347                 err = PTR_ERR(cciss_scan_thread);
5348                 goto err_bus_unregister;
5349         }
5350
5351         /* Register for our PCI devices */
5352         err = pci_register_driver(&cciss_pci_driver);
5353         if (err)
5354                 goto err_thread_stop;
5355
5356         return err;
5357
5358 err_thread_stop:
5359         kthread_stop(cciss_scan_thread);
5360 err_bus_unregister:
5361         bus_unregister(&cciss_bus_type);
5362
5363         return err;
5364 }
5365
5366 static void __exit cciss_cleanup(void)
5367 {
5368         int i;
5369
5370         pci_unregister_driver(&cciss_pci_driver);
5371         /* double check that all controller entrys have been removed */
5372         for (i = 0; i < MAX_CTLR; i++) {
5373                 if (hba[i] != NULL) {
5374                         dev_warn(&hba[i]->pdev->dev,
5375                                 "had to remove controller\n");
5376                         cciss_remove_one(hba[i]->pdev);
5377                 }
5378         }
5379         kthread_stop(cciss_scan_thread);
5380         if (proc_cciss)
5381                 remove_proc_entry("driver/cciss", NULL);
5382         bus_unregister(&cciss_bus_type);
5383 }
5384
5385 module_init(cciss_init);
5386 module_exit(cciss_cleanup);