af71a6d0edae358258234218b2e82d8f1d52426a
[linux-3.10.git] / drivers / scsi / libsas / sas_scsi_host.c
1 /*
2  * Serial Attached SCSI (SAS) class SCSI Host glue.
3  *
4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6  *
7  * This file is licensed under GPLv2.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of the
12  * License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22  * USA
23  *
24  */
25
26 #include <linux/kthread.h>
27 #include <linux/firmware.h>
28 #include <linux/export.h>
29 #include <linux/ctype.h>
30
31 #include "sas_internal.h"
32
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_eh.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_sas.h>
40 #include <scsi/sas_ata.h>
41 #include "../scsi_sas_internal.h"
42 #include "../scsi_transport_api.h"
43 #include "../scsi_priv.h"
44
45 #include <linux/err.h>
46 #include <linux/blkdev.h>
47 #include <linux/freezer.h>
48 #include <linux/gfp.h>
49 #include <linux/scatterlist.h>
50 #include <linux/libata.h>
51
52 /* record final status and free the task */
53 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
54 {
55         struct task_status_struct *ts = &task->task_status;
56         int hs = 0, stat = 0;
57
58         if (ts->resp == SAS_TASK_UNDELIVERED) {
59                 /* transport error */
60                 hs = DID_NO_CONNECT;
61         } else { /* ts->resp == SAS_TASK_COMPLETE */
62                 /* task delivered, what happened afterwards? */
63                 switch (ts->stat) {
64                 case SAS_DEV_NO_RESPONSE:
65                 case SAS_INTERRUPTED:
66                 case SAS_PHY_DOWN:
67                 case SAS_NAK_R_ERR:
68                 case SAS_OPEN_TO:
69                         hs = DID_NO_CONNECT;
70                         break;
71                 case SAS_DATA_UNDERRUN:
72                         scsi_set_resid(sc, ts->residual);
73                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
74                                 hs = DID_ERROR;
75                         break;
76                 case SAS_DATA_OVERRUN:
77                         hs = DID_ERROR;
78                         break;
79                 case SAS_QUEUE_FULL:
80                         hs = DID_SOFT_ERROR; /* retry */
81                         break;
82                 case SAS_DEVICE_UNKNOWN:
83                         hs = DID_BAD_TARGET;
84                         break;
85                 case SAS_SG_ERR:
86                         hs = DID_PARITY;
87                         break;
88                 case SAS_OPEN_REJECT:
89                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
90                                 hs = DID_SOFT_ERROR; /* retry */
91                         else
92                                 hs = DID_ERROR;
93                         break;
94                 case SAS_PROTO_RESPONSE:
95                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
96                                     "task; please report this\n",
97                                     task->dev->port->ha->sas_ha_name);
98                         break;
99                 case SAS_ABORTED_TASK:
100                         hs = DID_ABORT;
101                         break;
102                 case SAM_STAT_CHECK_CONDITION:
103                         memcpy(sc->sense_buffer, ts->buf,
104                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
105                         stat = SAM_STAT_CHECK_CONDITION;
106                         break;
107                 default:
108                         stat = ts->stat;
109                         break;
110                 }
111         }
112
113         sc->result = (hs << 16) | stat;
114         ASSIGN_SAS_TASK(sc, NULL);
115         list_del_init(&task->list);
116         sas_free_task(task);
117 }
118
119 static void sas_scsi_task_done(struct sas_task *task)
120 {
121         struct scsi_cmnd *sc = task->uldd_task;
122         struct domain_device *dev = task->dev;
123         struct sas_ha_struct *ha = dev->port->ha;
124         unsigned long flags;
125
126         spin_lock_irqsave(&dev->done_lock, flags);
127         if (test_bit(SAS_HA_FROZEN, &ha->state))
128                 task = NULL;
129         else
130                 ASSIGN_SAS_TASK(sc, NULL);
131         spin_unlock_irqrestore(&dev->done_lock, flags);
132
133         if (unlikely(!task)) {
134                 /* task will be completed by the error handler */
135                 SAS_DPRINTK("task done but aborted\n");
136                 return;
137         }
138
139         if (unlikely(!sc)) {
140                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
141                 list_del_init(&task->list);
142                 sas_free_task(task);
143                 return;
144         }
145
146         sas_end_task(sc, task);
147         sc->scsi_done(sc);
148 }
149
150 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
151                                                struct domain_device *dev,
152                                                gfp_t gfp_flags)
153 {
154         struct sas_task *task = sas_alloc_task(gfp_flags);
155         struct scsi_lun lun;
156
157         if (!task)
158                 return NULL;
159
160         task->uldd_task = cmd;
161         ASSIGN_SAS_TASK(cmd, task);
162
163         task->dev = dev;
164         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
165
166         task->ssp_task.retry_count = 1;
167         int_to_scsilun(cmd->device->lun, &lun);
168         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
169         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
170         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
171
172         task->scatter = scsi_sglist(cmd);
173         task->num_scatter = scsi_sg_count(cmd);
174         task->total_xfer_len = scsi_bufflen(cmd);
175         task->data_dir = cmd->sc_data_direction;
176
177         task->task_done = sas_scsi_task_done;
178
179         return task;
180 }
181
182 int sas_queue_up(struct sas_task *task)
183 {
184         struct sas_ha_struct *sas_ha = task->dev->port->ha;
185         struct scsi_core *core = &sas_ha->core;
186         unsigned long flags;
187         LIST_HEAD(list);
188
189         spin_lock_irqsave(&core->task_queue_lock, flags);
190         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
191                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
192                 return -SAS_QUEUE_FULL;
193         }
194         list_add_tail(&task->list, &core->task_queue);
195         core->task_queue_size += 1;
196         spin_unlock_irqrestore(&core->task_queue_lock, flags);
197         wake_up_process(core->queue_thread);
198
199         return 0;
200 }
201
202 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
203 {
204         struct sas_internal *i = to_sas_internal(host->transportt);
205         struct domain_device *dev = cmd_to_domain_dev(cmd);
206         struct sas_ha_struct *sas_ha = dev->port->ha;
207         struct sas_task *task;
208         int res = 0;
209
210         /* If the device fell off, no sense in issuing commands */
211         if (test_bit(SAS_DEV_GONE, &dev->state)) {
212                 cmd->result = DID_BAD_TARGET << 16;
213                 goto out_done;
214         }
215
216         if (dev_is_sata(dev)) {
217                 spin_lock_irq(dev->sata_dev.ap->lock);
218                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
219                 spin_unlock_irq(dev->sata_dev.ap->lock);
220                 return res;
221         }
222
223         task = sas_create_task(cmd, dev, GFP_ATOMIC);
224         if (!task)
225                 return SCSI_MLQUEUE_HOST_BUSY;
226
227         /* Queue up, Direct Mode or Task Collector Mode. */
228         if (sas_ha->lldd_max_execute_num < 2)
229                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
230         else
231                 res = sas_queue_up(task);
232
233         if (res)
234                 goto out_free_task;
235         return 0;
236
237 out_free_task:
238         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
239         ASSIGN_SAS_TASK(cmd, NULL);
240         sas_free_task(task);
241         if (res == -SAS_QUEUE_FULL)
242                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
243         else
244                 cmd->result = DID_ERROR << 16;
245 out_done:
246         cmd->scsi_done(cmd);
247         return 0;
248 }
249
250 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
251 {
252         struct sas_task *task = TO_SAS_TASK(cmd);
253         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
254
255         /* At this point, we only get called following an actual abort
256          * of the task, so we should be guaranteed not to be racing with
257          * any completions from the LLD.  Task is freed after this.
258          */
259         sas_end_task(cmd, task);
260
261         /* now finish the command and move it on to the error
262          * handler done list, this also takes it off the
263          * error handler pending list.
264          */
265         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
266 }
267
268 static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
269 {
270         struct sas_task *task = TO_SAS_TASK(cmd);
271         struct domain_device *dev = task->dev;
272         struct sas_ha_struct *ha = dev->port->ha;
273
274         if (!dev_is_sata(dev)) {
275                 sas_eh_finish_cmd(cmd);
276                 return;
277         }
278
279         /* report the timeout to libata */
280         sas_end_task(cmd, task);
281         list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
282 }
283
284 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
285 {
286         struct scsi_cmnd *cmd, *n;
287
288         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
289                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
290                     cmd->device->lun == my_cmd->device->lun)
291                         sas_eh_defer_cmd(cmd);
292         }
293 }
294
295 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
296                                      struct domain_device *dev)
297 {
298         struct scsi_cmnd *cmd, *n;
299
300         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
301                 struct domain_device *x = cmd_to_domain_dev(cmd);
302
303                 if (x == dev)
304                         sas_eh_finish_cmd(cmd);
305         }
306 }
307
308 static void sas_scsi_clear_queue_port(struct list_head *error_q,
309                                       struct asd_sas_port *port)
310 {
311         struct scsi_cmnd *cmd, *n;
312
313         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
314                 struct domain_device *dev = cmd_to_domain_dev(cmd);
315                 struct asd_sas_port *x = dev->port;
316
317                 if (x == port)
318                         sas_eh_finish_cmd(cmd);
319         }
320 }
321
322 enum task_disposition {
323         TASK_IS_DONE,
324         TASK_IS_ABORTED,
325         TASK_IS_AT_LU,
326         TASK_IS_NOT_AT_HA,
327         TASK_IS_NOT_AT_LU,
328         TASK_ABORT_FAILED,
329 };
330
331 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
332 {
333         struct sas_ha_struct *ha = task->dev->port->ha;
334         unsigned long flags;
335         int i, res;
336         struct sas_internal *si =
337                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
338
339         if (ha->lldd_max_execute_num > 1) {
340                 struct scsi_core *core = &ha->core;
341                 struct sas_task *t, *n;
342
343                 mutex_lock(&core->task_queue_flush);
344                 spin_lock_irqsave(&core->task_queue_lock, flags);
345                 list_for_each_entry_safe(t, n, &core->task_queue, list)
346                         if (task == t) {
347                                 list_del_init(&t->list);
348                                 break;
349                         }
350                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351                 mutex_unlock(&core->task_queue_flush);
352
353                 if (task == t)
354                         return TASK_IS_NOT_AT_HA;
355         }
356
357         for (i = 0; i < 5; i++) {
358                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
359                 res = si->dft->lldd_abort_task(task);
360
361                 spin_lock_irqsave(&task->task_state_lock, flags);
362                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
363                         spin_unlock_irqrestore(&task->task_state_lock, flags);
364                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
365                                     task);
366                         return TASK_IS_DONE;
367                 }
368                 spin_unlock_irqrestore(&task->task_state_lock, flags);
369
370                 if (res == TMF_RESP_FUNC_COMPLETE) {
371                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
372                                     __func__, task);
373                         return TASK_IS_ABORTED;
374                 } else if (si->dft->lldd_query_task) {
375                         SAS_DPRINTK("%s: querying task 0x%p\n",
376                                     __func__, task);
377                         res = si->dft->lldd_query_task(task);
378                         switch (res) {
379                         case TMF_RESP_FUNC_SUCC:
380                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
381                                             __func__, task);
382                                 return TASK_IS_AT_LU;
383                         case TMF_RESP_FUNC_COMPLETE:
384                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
385                                             __func__, task);
386                                 return TASK_IS_NOT_AT_LU;
387                         case TMF_RESP_FUNC_FAILED:
388                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
389                                                 __func__, task);
390                                 return TASK_ABORT_FAILED;
391                         }
392
393                 }
394         }
395         return res;
396 }
397
398 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
399 {
400         int res = TMF_RESP_FUNC_FAILED;
401         struct scsi_lun lun;
402         struct sas_internal *i =
403                 to_sas_internal(dev->port->ha->core.shost->transportt);
404
405         int_to_scsilun(cmd->device->lun, &lun);
406
407         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
408                     SAS_ADDR(dev->sas_addr),
409                     cmd->device->lun);
410
411         if (i->dft->lldd_abort_task_set)
412                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
413
414         if (res == TMF_RESP_FUNC_FAILED) {
415                 if (i->dft->lldd_clear_task_set)
416                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
417         }
418
419         if (res == TMF_RESP_FUNC_FAILED) {
420                 if (i->dft->lldd_lu_reset)
421                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
422         }
423
424         return res;
425 }
426
427 static int sas_recover_I_T(struct domain_device *dev)
428 {
429         int res = TMF_RESP_FUNC_FAILED;
430         struct sas_internal *i =
431                 to_sas_internal(dev->port->ha->core.shost->transportt);
432
433         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
434                     SAS_ADDR(dev->sas_addr));
435
436         if (i->dft->lldd_I_T_nexus_reset)
437                 res = i->dft->lldd_I_T_nexus_reset(dev);
438
439         return res;
440 }
441
442 /* Find the sas_phy that's attached to this device */
443 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
444 {
445         struct domain_device *pdev = dev->parent;
446         struct ex_phy *exphy = NULL;
447         int i;
448
449         /* Directly attached device */
450         if (!pdev)
451                 return dev->port->phy;
452
453         /* Otherwise look in the expander */
454         for (i = 0; i < pdev->ex_dev.num_phys; i++)
455                 if (!memcmp(dev->sas_addr,
456                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
457                             SAS_ADDR_SIZE)) {
458                         exphy = &pdev->ex_dev.ex_phy[i];
459                         break;
460                 }
461
462         BUG_ON(!exphy);
463         return exphy->phy;
464 }
465 EXPORT_SYMBOL_GPL(sas_find_local_phy);
466
467 /* Attempt to send a LUN reset message to a device */
468 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
469 {
470         struct domain_device *dev = cmd_to_domain_dev(cmd);
471         struct sas_internal *i =
472                 to_sas_internal(dev->port->ha->core.shost->transportt);
473         struct scsi_lun lun;
474         int res;
475
476         int_to_scsilun(cmd->device->lun, &lun);
477
478         if (!i->dft->lldd_lu_reset)
479                 return FAILED;
480
481         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
482         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
483                 return SUCCESS;
484
485         return FAILED;
486 }
487
488 /* Attempt to send a phy (bus) reset */
489 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
490 {
491         struct domain_device *dev = cmd_to_domain_dev(cmd);
492         struct sas_phy *phy = sas_find_local_phy(dev);
493         int res;
494
495         res = sas_phy_reset(phy, 1);
496         if (res)
497                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
498                             kobject_name(&phy->dev.kobj),
499                             res);
500         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
501                 return SUCCESS;
502
503         return FAILED;
504 }
505
506 /* Try to reset a device */
507 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
508 {
509         int res;
510         struct Scsi_Host *shost = cmd->device->host;
511
512         if (!shost->hostt->eh_device_reset_handler)
513                 goto try_bus_reset;
514
515         res = shost->hostt->eh_device_reset_handler(cmd);
516         if (res == SUCCESS)
517                 return res;
518
519 try_bus_reset:
520         if (shost->hostt->eh_bus_reset_handler)
521                 return shost->hostt->eh_bus_reset_handler(cmd);
522
523         return FAILED;
524 }
525
526 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
527                                     struct list_head *work_q)
528 {
529         struct scsi_cmnd *cmd, *n;
530         enum task_disposition res = TASK_IS_DONE;
531         int tmf_resp, need_reset;
532         struct sas_internal *i = to_sas_internal(shost->transportt);
533         unsigned long flags;
534         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
535
536 Again:
537         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
538                 struct domain_device *dev = cmd_to_domain_dev(cmd);
539                 struct sas_task *task;
540
541                 spin_lock_irqsave(&dev->done_lock, flags);
542                 /* by this point the lldd has either observed
543                  * SAS_HA_FROZEN and is leaving the task alone, or has
544                  * won the race with eh and decided to complete it
545                  */
546                 task = TO_SAS_TASK(cmd);
547                 spin_unlock_irqrestore(&dev->done_lock, flags);
548
549                 if (!task)
550                         continue;
551
552                 list_del_init(&cmd->eh_entry);
553
554                 spin_lock_irqsave(&task->task_state_lock, flags);
555                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
556                 spin_unlock_irqrestore(&task->task_state_lock, flags);
557
558                 if (need_reset) {
559                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
560                                     __func__, task);
561                         goto reset;
562                 }
563
564                 SAS_DPRINTK("trying to find task 0x%p\n", task);
565                 res = sas_scsi_find_task(task);
566
567                 cmd->eh_eflags = 0;
568
569                 switch (res) {
570                 case TASK_IS_NOT_AT_HA:
571                         SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
572                                     __func__, task,
573                                     cmd->retries ? "retry" : "aborted");
574                         if (cmd->retries)
575                                 cmd->retries--;
576                         sas_eh_finish_cmd(cmd);
577                         continue;
578                 case TASK_IS_DONE:
579                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
580                                     task);
581                         sas_eh_defer_cmd(cmd);
582                         continue;
583                 case TASK_IS_ABORTED:
584                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
585                                     __func__, task);
586                         sas_eh_defer_cmd(cmd);
587                         continue;
588                 case TASK_IS_AT_LU:
589                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
590  reset:
591                         tmf_resp = sas_recover_lu(task->dev, cmd);
592                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
593                                 SAS_DPRINTK("dev %016llx LU %x is "
594                                             "recovered\n",
595                                             SAS_ADDR(task->dev),
596                                             cmd->device->lun);
597                                 sas_eh_defer_cmd(cmd);
598                                 sas_scsi_clear_queue_lu(work_q, cmd);
599                                 goto Again;
600                         }
601                         /* fallthrough */
602                 case TASK_IS_NOT_AT_LU:
603                 case TASK_ABORT_FAILED:
604                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
605                                     task);
606                         tmf_resp = sas_recover_I_T(task->dev);
607                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
608                                 struct domain_device *dev = task->dev;
609                                 SAS_DPRINTK("I_T %016llx recovered\n",
610                                             SAS_ADDR(task->dev->sas_addr));
611                                 sas_eh_finish_cmd(cmd);
612                                 sas_scsi_clear_queue_I_T(work_q, dev);
613                                 goto Again;
614                         }
615                         /* Hammer time :-) */
616                         try_to_reset_cmd_device(cmd);
617                         if (i->dft->lldd_clear_nexus_port) {
618                                 struct asd_sas_port *port = task->dev->port;
619                                 SAS_DPRINTK("clearing nexus for port:%d\n",
620                                             port->id);
621                                 res = i->dft->lldd_clear_nexus_port(port);
622                                 if (res == TMF_RESP_FUNC_COMPLETE) {
623                                         SAS_DPRINTK("clear nexus port:%d "
624                                                     "succeeded\n", port->id);
625                                         sas_eh_finish_cmd(cmd);
626                                         sas_scsi_clear_queue_port(work_q,
627                                                                   port);
628                                         goto Again;
629                                 }
630                         }
631                         if (i->dft->lldd_clear_nexus_ha) {
632                                 SAS_DPRINTK("clear nexus ha\n");
633                                 res = i->dft->lldd_clear_nexus_ha(ha);
634                                 if (res == TMF_RESP_FUNC_COMPLETE) {
635                                         SAS_DPRINTK("clear nexus ha "
636                                                     "succeeded\n");
637                                         sas_eh_finish_cmd(cmd);
638                                         goto clear_q;
639                                 }
640                         }
641                         /* If we are here -- this means that no amount
642                          * of effort could recover from errors.  Quite
643                          * possibly the HA just disappeared.
644                          */
645                         SAS_DPRINTK("error from  device %llx, LUN %x "
646                                     "couldn't be recovered in any way\n",
647                                     SAS_ADDR(task->dev->sas_addr),
648                                     cmd->device->lun);
649
650                         sas_eh_finish_cmd(cmd);
651                         goto clear_q;
652                 }
653         }
654         list_splice_tail_init(&ha->eh_ata_q, work_q);
655         return list_empty(work_q);
656 clear_q:
657         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
658         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
659                 sas_eh_finish_cmd(cmd);
660
661         list_splice_tail_init(&ha->eh_ata_q, work_q);
662         return list_empty(work_q);
663 }
664
665 void sas_scsi_recover_host(struct Scsi_Host *shost)
666 {
667         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
668         unsigned long flags;
669         LIST_HEAD(eh_work_q);
670
671         spin_lock_irqsave(shost->host_lock, flags);
672         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
673         shost->host_eh_scheduled = 0;
674         spin_unlock_irqrestore(shost->host_lock, flags);
675
676         SAS_DPRINTK("Enter %s\n", __func__);
677         /*
678          * Deal with commands that still have SAS tasks (i.e. they didn't
679          * complete via the normal sas_task completion mechanism)
680          */
681         set_bit(SAS_HA_FROZEN, &ha->state);
682         if (sas_eh_handle_sas_errors(shost, &eh_work_q))
683                 goto out;
684
685         /*
686          * Now deal with SCSI commands that completed ok but have a an error
687          * code (and hopefully sense data) attached.  This is roughly what
688          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
689          * command we see here has no sas_task and is thus unknown to the HA.
690          */
691         if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
692                 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
693                         scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
694
695 out:
696         clear_bit(SAS_HA_FROZEN, &ha->state);
697         if (ha->lldd_max_execute_num > 1)
698                 wake_up_process(ha->core.queue_thread);
699
700         /* now link into libata eh --- if we have any ata devices */
701         sas_ata_strategy_handler(shost);
702
703         scsi_eh_flush_done_q(&ha->eh_done_q);
704
705         SAS_DPRINTK("--- Exit %s\n", __func__);
706         return;
707 }
708
709 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
710 {
711         scmd_printk(KERN_DEBUG, cmd, "command %p timed out\n", cmd);
712
713         return BLK_EH_NOT_HANDLED;
714 }
715
716 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
717 {
718         struct domain_device *dev = sdev_to_domain_dev(sdev);
719
720         if (dev_is_sata(dev))
721                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
722
723         return -EINVAL;
724 }
725
726 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
727 {
728         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
729         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
730         struct domain_device *found_dev = NULL;
731         int i;
732         unsigned long flags;
733
734         spin_lock_irqsave(&ha->phy_port_lock, flags);
735         for (i = 0; i < ha->num_phys; i++) {
736                 struct asd_sas_port *port = ha->sas_port[i];
737                 struct domain_device *dev;
738
739                 spin_lock(&port->dev_list_lock);
740                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
741                         if (rphy == dev->rphy) {
742                                 found_dev = dev;
743                                 spin_unlock(&port->dev_list_lock);
744                                 goto found;
745                         }
746                 }
747                 spin_unlock(&port->dev_list_lock);
748         }
749  found:
750         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
751
752         return found_dev;
753 }
754
755 int sas_target_alloc(struct scsi_target *starget)
756 {
757         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
758         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
759         int res;
760
761         if (!found_dev)
762                 return -ENODEV;
763
764         if (dev_is_sata(found_dev)) {
765                 res = sas_ata_init_host_and_port(found_dev, starget);
766                 if (res)
767                         return res;
768         }
769
770         kref_get(&found_dev->kref);
771         starget->hostdata = found_dev;
772         return 0;
773 }
774
775 #define SAS_DEF_QD 256
776
777 int sas_slave_configure(struct scsi_device *scsi_dev)
778 {
779         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
780         struct sas_ha_struct *sas_ha;
781
782         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
783
784         if (dev_is_sata(dev)) {
785                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
786                 return 0;
787         }
788
789         sas_ha = dev->port->ha;
790
791         sas_read_port_mode_page(scsi_dev);
792
793         if (scsi_dev->tagged_supported) {
794                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
795                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
796         } else {
797                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
798                             "TCQ\n", SAS_ADDR(dev->sas_addr),
799                             scsi_dev->lun);
800                 scsi_dev->tagged_supported = 0;
801                 scsi_set_tag_type(scsi_dev, 0);
802                 scsi_deactivate_tcq(scsi_dev, 1);
803         }
804
805         scsi_dev->allow_restart = 1;
806
807         return 0;
808 }
809
810 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
811 {
812         struct domain_device *dev = sdev_to_domain_dev(sdev);
813
814         if (dev_is_sata(dev))
815                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
816                                                 reason);
817
818         switch (reason) {
819         case SCSI_QDEPTH_DEFAULT:
820         case SCSI_QDEPTH_RAMP_UP:
821                 if (!sdev->tagged_supported)
822                         depth = 1;
823                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
824                 break;
825         case SCSI_QDEPTH_QFULL:
826                 scsi_track_queue_full(sdev, depth);
827                 break;
828         default:
829                 return -EOPNOTSUPP;
830         }
831
832         return depth;
833 }
834
835 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
836 {
837         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
838
839         if (dev_is_sata(dev))
840                 return -EINVAL;
841
842         if (!scsi_dev->tagged_supported)
843                 return 0;
844
845         scsi_deactivate_tcq(scsi_dev, 1);
846
847         scsi_set_tag_type(scsi_dev, qt);
848         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
849
850         return qt;
851 }
852
853 int sas_bios_param(struct scsi_device *scsi_dev,
854                           struct block_device *bdev,
855                           sector_t capacity, int *hsc)
856 {
857         hsc[0] = 255;
858         hsc[1] = 63;
859         sector_div(capacity, 255*63);
860         hsc[2] = capacity;
861
862         return 0;
863 }
864
865 /* ---------- Task Collector Thread implementation ---------- */
866
867 static void sas_queue(struct sas_ha_struct *sas_ha)
868 {
869         struct scsi_core *core = &sas_ha->core;
870         unsigned long flags;
871         LIST_HEAD(q);
872         int can_queue;
873         int res;
874         struct sas_internal *i = to_sas_internal(core->shost->transportt);
875
876         mutex_lock(&core->task_queue_flush);
877         spin_lock_irqsave(&core->task_queue_lock, flags);
878         while (!kthread_should_stop() &&
879                !list_empty(&core->task_queue) &&
880                !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
881
882                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
883                 if (can_queue >= 0) {
884                         can_queue = core->task_queue_size;
885                         list_splice_init(&core->task_queue, &q);
886                 } else {
887                         struct list_head *a, *n;
888
889                         can_queue = sas_ha->lldd_queue_size;
890                         list_for_each_safe(a, n, &core->task_queue) {
891                                 list_move_tail(a, &q);
892                                 if (--can_queue == 0)
893                                         break;
894                         }
895                         can_queue = sas_ha->lldd_queue_size;
896                 }
897                 core->task_queue_size -= can_queue;
898                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
899                 {
900                         struct sas_task *task = list_entry(q.next,
901                                                            struct sas_task,
902                                                            list);
903                         list_del_init(&q);
904                         res = i->dft->lldd_execute_task(task, can_queue,
905                                                         GFP_KERNEL);
906                         if (unlikely(res))
907                                 __list_add(&q, task->list.prev, &task->list);
908                 }
909                 spin_lock_irqsave(&core->task_queue_lock, flags);
910                 if (res) {
911                         list_splice_init(&q, &core->task_queue); /*at head*/
912                         core->task_queue_size += can_queue;
913                 }
914         }
915         spin_unlock_irqrestore(&core->task_queue_lock, flags);
916         mutex_unlock(&core->task_queue_flush);
917 }
918
919 /**
920  * sas_queue_thread -- The Task Collector thread
921  * @_sas_ha: pointer to struct sas_ha
922  */
923 static int sas_queue_thread(void *_sas_ha)
924 {
925         struct sas_ha_struct *sas_ha = _sas_ha;
926
927         while (1) {
928                 set_current_state(TASK_INTERRUPTIBLE);
929                 schedule();
930                 sas_queue(sas_ha);
931                 if (kthread_should_stop())
932                         break;
933         }
934
935         return 0;
936 }
937
938 int sas_init_queue(struct sas_ha_struct *sas_ha)
939 {
940         struct scsi_core *core = &sas_ha->core;
941
942         spin_lock_init(&core->task_queue_lock);
943         mutex_init(&core->task_queue_flush);
944         core->task_queue_size = 0;
945         INIT_LIST_HEAD(&core->task_queue);
946
947         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
948                                          "sas_queue_%d", core->shost->host_no);
949         if (IS_ERR(core->queue_thread))
950                 return PTR_ERR(core->queue_thread);
951         return 0;
952 }
953
954 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
955 {
956         unsigned long flags;
957         struct scsi_core *core = &sas_ha->core;
958         struct sas_task *task, *n;
959
960         kthread_stop(core->queue_thread);
961
962         if (!list_empty(&core->task_queue))
963                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
964                             SAS_ADDR(sas_ha->sas_addr));
965
966         spin_lock_irqsave(&core->task_queue_lock, flags);
967         list_for_each_entry_safe(task, n, &core->task_queue, list) {
968                 struct scsi_cmnd *cmd = task->uldd_task;
969
970                 list_del_init(&task->list);
971
972                 ASSIGN_SAS_TASK(cmd, NULL);
973                 sas_free_task(task);
974                 cmd->result = DID_ABORT << 16;
975                 cmd->scsi_done(cmd);
976         }
977         spin_unlock_irqrestore(&core->task_queue_lock, flags);
978 }
979
980 /*
981  * Tell an upper layer that it needs to initiate an abort for a given task.
982  * This should only ever be called by an LLDD.
983  */
984 void sas_task_abort(struct sas_task *task)
985 {
986         struct scsi_cmnd *sc = task->uldd_task;
987
988         /* Escape for libsas internal commands */
989         if (!sc) {
990                 if (!del_timer(&task->timer))
991                         return;
992                 task->timer.function(task->timer.data);
993                 return;
994         }
995
996         if (dev_is_sata(task->dev)) {
997                 sas_ata_task_abort(task);
998         } else {
999                 struct request_queue *q = sc->device->request_queue;
1000                 unsigned long flags;
1001
1002                 spin_lock_irqsave(q->queue_lock, flags);
1003                 blk_abort_request(sc->request);
1004                 spin_unlock_irqrestore(q->queue_lock, flags);
1005                 scsi_schedule_eh(sc->device->host);
1006         }
1007 }
1008
1009 int sas_slave_alloc(struct scsi_device *scsi_dev)
1010 {
1011         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1012
1013         if (dev_is_sata(dev))
1014                 return ata_sas_port_init(dev->sata_dev.ap);
1015
1016         return 0;
1017 }
1018
1019 void sas_target_destroy(struct scsi_target *starget)
1020 {
1021         struct domain_device *found_dev = starget->hostdata;
1022
1023         if (!found_dev)
1024                 return;
1025
1026         if (dev_is_sata(found_dev))
1027                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1028
1029         starget->hostdata = NULL;
1030         sas_put_device(found_dev);
1031 }
1032
1033 static void sas_parse_addr(u8 *sas_addr, const char *p)
1034 {
1035         int i;
1036         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1037                 u8 h, l;
1038                 if (!*p)
1039                         break;
1040                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1041                 p++;
1042                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1043                 p++;
1044                 sas_addr[i] = (h<<4) | l;
1045         }
1046 }
1047
1048 #define SAS_STRING_ADDR_SIZE    16
1049
1050 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1051 {
1052         int res;
1053         const struct firmware *fw;
1054
1055         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1056         if (res)
1057                 return res;
1058
1059         if (fw->size < SAS_STRING_ADDR_SIZE) {
1060                 res = -ENODEV;
1061                 goto out;
1062         }
1063
1064         sas_parse_addr(addr, fw->data);
1065
1066 out:
1067         release_firmware(fw);
1068         return res;
1069 }
1070 EXPORT_SYMBOL_GPL(sas_request_addr);
1071
1072 EXPORT_SYMBOL_GPL(sas_queuecommand);
1073 EXPORT_SYMBOL_GPL(sas_target_alloc);
1074 EXPORT_SYMBOL_GPL(sas_slave_configure);
1075 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1076 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1077 EXPORT_SYMBOL_GPL(sas_bios_param);
1078 EXPORT_SYMBOL_GPL(sas_task_abort);
1079 EXPORT_SYMBOL_GPL(sas_phy_reset);
1080 EXPORT_SYMBOL_GPL(sas_phy_enable);
1081 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1082 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1083 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1084 EXPORT_SYMBOL_GPL(sas_target_destroy);
1085 EXPORT_SYMBOL_GPL(sas_ioctl);