scsi: qla2xxx: Remove FC_NO_LOOP_ID for FCP and FC-NVMe Discovery
[muen/linux.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 #include <linux/kernel.h>
31
32 #include "sas_internal.h"
33
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_tcq.h>
37 #include <scsi/scsi.h>
38 #include <scsi/scsi_eh.h>
39 #include <scsi/scsi_transport.h>
40 #include <scsi/scsi_transport_sas.h>
41 #include <scsi/sas_ata.h>
42 #include "../scsi_sas_internal.h"
43 #include "../scsi_transport_api.h"
44 #include "../scsi_priv.h"
45
46 #include <linux/err.h>
47 #include <linux/blkdev.h>
48 #include <linux/freezer.h>
49 #include <linux/gfp.h>
50 #include <linux/scatterlist.h>
51 #include <linux/libata.h>
52
53 /* record final status and free the task */
54 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
55 {
56         struct task_status_struct *ts = &task->task_status;
57         int hs = 0, stat = 0;
58
59         if (ts->resp == SAS_TASK_UNDELIVERED) {
60                 /* transport error */
61                 hs = DID_NO_CONNECT;
62         } else { /* ts->resp == SAS_TASK_COMPLETE */
63                 /* task delivered, what happened afterwards? */
64                 switch (ts->stat) {
65                 case SAS_DEV_NO_RESPONSE:
66                 case SAS_INTERRUPTED:
67                 case SAS_PHY_DOWN:
68                 case SAS_NAK_R_ERR:
69                 case SAS_OPEN_TO:
70                         hs = DID_NO_CONNECT;
71                         break;
72                 case SAS_DATA_UNDERRUN:
73                         scsi_set_resid(sc, ts->residual);
74                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
75                                 hs = DID_ERROR;
76                         break;
77                 case SAS_DATA_OVERRUN:
78                         hs = DID_ERROR;
79                         break;
80                 case SAS_QUEUE_FULL:
81                         hs = DID_SOFT_ERROR; /* retry */
82                         break;
83                 case SAS_DEVICE_UNKNOWN:
84                         hs = DID_BAD_TARGET;
85                         break;
86                 case SAS_SG_ERR:
87                         hs = DID_PARITY;
88                         break;
89                 case SAS_OPEN_REJECT:
90                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
91                                 hs = DID_SOFT_ERROR; /* retry */
92                         else
93                                 hs = DID_ERROR;
94                         break;
95                 case SAS_PROTO_RESPONSE:
96                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
97                                     "task; please report this\n",
98                                     task->dev->port->ha->sas_ha_name);
99                         break;
100                 case SAS_ABORTED_TASK:
101                         hs = DID_ABORT;
102                         break;
103                 case SAM_STAT_CHECK_CONDITION:
104                         memcpy(sc->sense_buffer, ts->buf,
105                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
106                         stat = SAM_STAT_CHECK_CONDITION;
107                         break;
108                 default:
109                         stat = ts->stat;
110                         break;
111                 }
112         }
113
114         sc->result = (hs << 16) | stat;
115         ASSIGN_SAS_TASK(sc, NULL);
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                 sas_free_task(task);
142                 return;
143         }
144
145         sas_end_task(sc, task);
146         sc->scsi_done(sc);
147 }
148
149 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
150                                                struct domain_device *dev,
151                                                gfp_t gfp_flags)
152 {
153         struct sas_task *task = sas_alloc_task(gfp_flags);
154         struct scsi_lun lun;
155
156         if (!task)
157                 return NULL;
158
159         task->uldd_task = cmd;
160         ASSIGN_SAS_TASK(cmd, task);
161
162         task->dev = dev;
163         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
164
165         task->ssp_task.retry_count = 1;
166         int_to_scsilun(cmd->device->lun, &lun);
167         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
168         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
169         task->ssp_task.cmd = cmd;
170
171         task->scatter = scsi_sglist(cmd);
172         task->num_scatter = scsi_sg_count(cmd);
173         task->total_xfer_len = scsi_bufflen(cmd);
174         task->data_dir = cmd->sc_data_direction;
175
176         task->task_done = sas_scsi_task_done;
177
178         return task;
179 }
180
181 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
182 {
183         struct sas_internal *i = to_sas_internal(host->transportt);
184         struct domain_device *dev = cmd_to_domain_dev(cmd);
185         struct sas_task *task;
186         int res = 0;
187
188         /* If the device fell off, no sense in issuing commands */
189         if (test_bit(SAS_DEV_GONE, &dev->state)) {
190                 cmd->result = DID_BAD_TARGET << 16;
191                 goto out_done;
192         }
193
194         if (dev_is_sata(dev)) {
195                 spin_lock_irq(dev->sata_dev.ap->lock);
196                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
197                 spin_unlock_irq(dev->sata_dev.ap->lock);
198                 return res;
199         }
200
201         task = sas_create_task(cmd, dev, GFP_ATOMIC);
202         if (!task)
203                 return SCSI_MLQUEUE_HOST_BUSY;
204
205         res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
206         if (res)
207                 goto out_free_task;
208         return 0;
209
210 out_free_task:
211         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
212         ASSIGN_SAS_TASK(cmd, NULL);
213         sas_free_task(task);
214         if (res == -SAS_QUEUE_FULL)
215                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
216         else
217                 cmd->result = DID_ERROR << 16;
218 out_done:
219         cmd->scsi_done(cmd);
220         return 0;
221 }
222
223 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
224 {
225         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
226         struct domain_device *dev = cmd_to_domain_dev(cmd);
227         struct sas_task *task = TO_SAS_TASK(cmd);
228
229         /* At this point, we only get called following an actual abort
230          * of the task, so we should be guaranteed not to be racing with
231          * any completions from the LLD.  Task is freed after this.
232          */
233         sas_end_task(cmd, task);
234
235         if (dev_is_sata(dev)) {
236                 /* defer commands to libata so that libata EH can
237                  * handle ata qcs correctly
238                  */
239                 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
240                 return;
241         }
242
243         /* now finish the command and move it on to the error
244          * handler done list, this also takes it off the
245          * error handler pending list.
246          */
247         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
248 }
249
250 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
251 {
252         struct scsi_cmnd *cmd, *n;
253
254         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
255                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
256                     cmd->device->lun == my_cmd->device->lun)
257                         sas_eh_finish_cmd(cmd);
258         }
259 }
260
261 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
262                                      struct domain_device *dev)
263 {
264         struct scsi_cmnd *cmd, *n;
265
266         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
267                 struct domain_device *x = cmd_to_domain_dev(cmd);
268
269                 if (x == dev)
270                         sas_eh_finish_cmd(cmd);
271         }
272 }
273
274 static void sas_scsi_clear_queue_port(struct list_head *error_q,
275                                       struct asd_sas_port *port)
276 {
277         struct scsi_cmnd *cmd, *n;
278
279         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
280                 struct domain_device *dev = cmd_to_domain_dev(cmd);
281                 struct asd_sas_port *x = dev->port;
282
283                 if (x == port)
284                         sas_eh_finish_cmd(cmd);
285         }
286 }
287
288 enum task_disposition {
289         TASK_IS_DONE,
290         TASK_IS_ABORTED,
291         TASK_IS_AT_LU,
292         TASK_IS_NOT_AT_LU,
293         TASK_ABORT_FAILED,
294 };
295
296 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
297 {
298         unsigned long flags;
299         int i, res;
300         struct sas_internal *si =
301                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
302
303         for (i = 0; i < 5; i++) {
304                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
305                 res = si->dft->lldd_abort_task(task);
306
307                 spin_lock_irqsave(&task->task_state_lock, flags);
308                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
309                         spin_unlock_irqrestore(&task->task_state_lock, flags);
310                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
311                                     task);
312                         return TASK_IS_DONE;
313                 }
314                 spin_unlock_irqrestore(&task->task_state_lock, flags);
315
316                 if (res == TMF_RESP_FUNC_COMPLETE) {
317                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
318                                     __func__, task);
319                         return TASK_IS_ABORTED;
320                 } else if (si->dft->lldd_query_task) {
321                         SAS_DPRINTK("%s: querying task 0x%p\n",
322                                     __func__, task);
323                         res = si->dft->lldd_query_task(task);
324                         switch (res) {
325                         case TMF_RESP_FUNC_SUCC:
326                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
327                                             __func__, task);
328                                 return TASK_IS_AT_LU;
329                         case TMF_RESP_FUNC_COMPLETE:
330                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
331                                             __func__, task);
332                                 return TASK_IS_NOT_AT_LU;
333                         case TMF_RESP_FUNC_FAILED:
334                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
335                                                 __func__, task);
336                                 return TASK_ABORT_FAILED;
337                         }
338
339                 }
340         }
341         return res;
342 }
343
344 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
345 {
346         int res = TMF_RESP_FUNC_FAILED;
347         struct scsi_lun lun;
348         struct sas_internal *i =
349                 to_sas_internal(dev->port->ha->core.shost->transportt);
350
351         int_to_scsilun(cmd->device->lun, &lun);
352
353         SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
354                     SAS_ADDR(dev->sas_addr),
355                     cmd->device->lun);
356
357         if (i->dft->lldd_abort_task_set)
358                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
359
360         if (res == TMF_RESP_FUNC_FAILED) {
361                 if (i->dft->lldd_clear_task_set)
362                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
363         }
364
365         if (res == TMF_RESP_FUNC_FAILED) {
366                 if (i->dft->lldd_lu_reset)
367                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
368         }
369
370         return res;
371 }
372
373 static int sas_recover_I_T(struct domain_device *dev)
374 {
375         int res = TMF_RESP_FUNC_FAILED;
376         struct sas_internal *i =
377                 to_sas_internal(dev->port->ha->core.shost->transportt);
378
379         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
380                     SAS_ADDR(dev->sas_addr));
381
382         if (i->dft->lldd_I_T_nexus_reset)
383                 res = i->dft->lldd_I_T_nexus_reset(dev);
384
385         return res;
386 }
387
388 /* take a reference on the last known good phy for this device */
389 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
390 {
391         struct sas_ha_struct *ha = dev->port->ha;
392         struct sas_phy *phy;
393         unsigned long flags;
394
395         /* a published domain device always has a valid phy, it may be
396          * stale, but it is never NULL
397          */
398         BUG_ON(!dev->phy);
399
400         spin_lock_irqsave(&ha->phy_port_lock, flags);
401         phy = dev->phy;
402         get_device(&phy->dev);
403         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
404
405         return phy;
406 }
407 EXPORT_SYMBOL_GPL(sas_get_local_phy);
408
409 static void sas_wait_eh(struct domain_device *dev)
410 {
411         struct sas_ha_struct *ha = dev->port->ha;
412         DEFINE_WAIT(wait);
413
414         if (dev_is_sata(dev)) {
415                 ata_port_wait_eh(dev->sata_dev.ap);
416                 return;
417         }
418  retry:
419         spin_lock_irq(&ha->lock);
420
421         while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
422                 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
423                 spin_unlock_irq(&ha->lock);
424                 schedule();
425                 spin_lock_irq(&ha->lock);
426         }
427         finish_wait(&ha->eh_wait_q, &wait);
428
429         spin_unlock_irq(&ha->lock);
430
431         /* make sure SCSI EH is complete */
432         if (scsi_host_in_recovery(ha->core.shost)) {
433                 msleep(10);
434                 goto retry;
435         }
436 }
437 EXPORT_SYMBOL(sas_wait_eh);
438
439 static int sas_queue_reset(struct domain_device *dev, int reset_type,
440                            u64 lun, int wait)
441 {
442         struct sas_ha_struct *ha = dev->port->ha;
443         int scheduled = 0, tries = 100;
444
445         /* ata: promote lun reset to bus reset */
446         if (dev_is_sata(dev)) {
447                 sas_ata_schedule_reset(dev);
448                 if (wait)
449                         sas_ata_wait_eh(dev);
450                 return SUCCESS;
451         }
452
453         while (!scheduled && tries--) {
454                 spin_lock_irq(&ha->lock);
455                 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
456                     !test_bit(reset_type, &dev->state)) {
457                         scheduled = 1;
458                         ha->eh_active++;
459                         list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
460                         set_bit(SAS_DEV_EH_PENDING, &dev->state);
461                         set_bit(reset_type, &dev->state);
462                         int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
463                         scsi_schedule_eh(ha->core.shost);
464                 }
465                 spin_unlock_irq(&ha->lock);
466
467                 if (wait)
468                         sas_wait_eh(dev);
469
470                 if (scheduled)
471                         return SUCCESS;
472         }
473
474         SAS_DPRINTK("%s reset of %s failed\n",
475                     reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
476                     dev_name(&dev->rphy->dev));
477
478         return FAILED;
479 }
480
481 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
482 {
483         int res;
484         struct sas_task *task = TO_SAS_TASK(cmd);
485         struct Scsi_Host *host = cmd->device->host;
486         struct sas_internal *i = to_sas_internal(host->transportt);
487
488         if (!i->dft->lldd_abort_task)
489                 return FAILED;
490
491         res = i->dft->lldd_abort_task(task);
492         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
493                 return SUCCESS;
494
495         return FAILED;
496 }
497 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
498
499 /* Attempt to send a LUN reset message to a device */
500 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
501 {
502         int res;
503         struct scsi_lun lun;
504         struct Scsi_Host *host = cmd->device->host;
505         struct domain_device *dev = cmd_to_domain_dev(cmd);
506         struct sas_internal *i = to_sas_internal(host->transportt);
507
508         if (current != host->ehandler)
509                 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
510
511         int_to_scsilun(cmd->device->lun, &lun);
512
513         if (!i->dft->lldd_lu_reset)
514                 return FAILED;
515
516         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
517         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
518                 return SUCCESS;
519
520         return FAILED;
521 }
522
523 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
524 {
525         int res;
526         struct Scsi_Host *host = cmd->device->host;
527         struct domain_device *dev = cmd_to_domain_dev(cmd);
528         struct sas_internal *i = to_sas_internal(host->transportt);
529
530         if (current != host->ehandler)
531                 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
532
533         if (!i->dft->lldd_I_T_nexus_reset)
534                 return FAILED;
535
536         res = i->dft->lldd_I_T_nexus_reset(dev);
537         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
538             res == -ENODEV)
539                 return SUCCESS;
540
541         return FAILED;
542 }
543
544 /* Try to reset a device */
545 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
546 {
547         int res;
548         struct Scsi_Host *shost = cmd->device->host;
549
550         if (!shost->hostt->eh_device_reset_handler)
551                 goto try_target_reset;
552
553         res = shost->hostt->eh_device_reset_handler(cmd);
554         if (res == SUCCESS)
555                 return res;
556
557 try_target_reset:
558         if (shost->hostt->eh_target_reset_handler)
559                 return shost->hostt->eh_target_reset_handler(cmd);
560
561         return FAILED;
562 }
563
564 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
565 {
566         struct scsi_cmnd *cmd, *n;
567         enum task_disposition res = TASK_IS_DONE;
568         int tmf_resp, need_reset;
569         struct sas_internal *i = to_sas_internal(shost->transportt);
570         unsigned long flags;
571         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
572         LIST_HEAD(done);
573
574         /* clean out any commands that won the completion vs eh race */
575         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
576                 struct domain_device *dev = cmd_to_domain_dev(cmd);
577                 struct sas_task *task;
578
579                 spin_lock_irqsave(&dev->done_lock, flags);
580                 /* by this point the lldd has either observed
581                  * SAS_HA_FROZEN and is leaving the task alone, or has
582                  * won the race with eh and decided to complete it
583                  */
584                 task = TO_SAS_TASK(cmd);
585                 spin_unlock_irqrestore(&dev->done_lock, flags);
586
587                 if (!task)
588                         list_move_tail(&cmd->eh_entry, &done);
589         }
590
591  Again:
592         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
593                 struct sas_task *task = TO_SAS_TASK(cmd);
594
595                 list_del_init(&cmd->eh_entry);
596
597                 spin_lock_irqsave(&task->task_state_lock, flags);
598                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
599                 spin_unlock_irqrestore(&task->task_state_lock, flags);
600
601                 if (need_reset) {
602                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
603                                     __func__, task);
604                         goto reset;
605                 }
606
607                 SAS_DPRINTK("trying to find task 0x%p\n", task);
608                 res = sas_scsi_find_task(task);
609
610                 switch (res) {
611                 case TASK_IS_DONE:
612                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
613                                     task);
614                         sas_eh_finish_cmd(cmd);
615                         continue;
616                 case TASK_IS_ABORTED:
617                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
618                                     __func__, task);
619                         sas_eh_finish_cmd(cmd);
620                         continue;
621                 case TASK_IS_AT_LU:
622                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
623  reset:
624                         tmf_resp = sas_recover_lu(task->dev, cmd);
625                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
626                                 SAS_DPRINTK("dev %016llx LU %llx is "
627                                             "recovered\n",
628                                             SAS_ADDR(task->dev),
629                                             cmd->device->lun);
630                                 sas_eh_finish_cmd(cmd);
631                                 sas_scsi_clear_queue_lu(work_q, cmd);
632                                 goto Again;
633                         }
634                         /* fallthrough */
635                 case TASK_IS_NOT_AT_LU:
636                 case TASK_ABORT_FAILED:
637                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
638                                     task);
639                         tmf_resp = sas_recover_I_T(task->dev);
640                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
641                             tmf_resp == -ENODEV) {
642                                 struct domain_device *dev = task->dev;
643                                 SAS_DPRINTK("I_T %016llx recovered\n",
644                                             SAS_ADDR(task->dev->sas_addr));
645                                 sas_eh_finish_cmd(cmd);
646                                 sas_scsi_clear_queue_I_T(work_q, dev);
647                                 goto Again;
648                         }
649                         /* Hammer time :-) */
650                         try_to_reset_cmd_device(cmd);
651                         if (i->dft->lldd_clear_nexus_port) {
652                                 struct asd_sas_port *port = task->dev->port;
653                                 SAS_DPRINTK("clearing nexus for port:%d\n",
654                                             port->id);
655                                 res = i->dft->lldd_clear_nexus_port(port);
656                                 if (res == TMF_RESP_FUNC_COMPLETE) {
657                                         SAS_DPRINTK("clear nexus port:%d "
658                                                     "succeeded\n", port->id);
659                                         sas_eh_finish_cmd(cmd);
660                                         sas_scsi_clear_queue_port(work_q,
661                                                                   port);
662                                         goto Again;
663                                 }
664                         }
665                         if (i->dft->lldd_clear_nexus_ha) {
666                                 SAS_DPRINTK("clear nexus ha\n");
667                                 res = i->dft->lldd_clear_nexus_ha(ha);
668                                 if (res == TMF_RESP_FUNC_COMPLETE) {
669                                         SAS_DPRINTK("clear nexus ha "
670                                                     "succeeded\n");
671                                         sas_eh_finish_cmd(cmd);
672                                         goto clear_q;
673                                 }
674                         }
675                         /* If we are here -- this means that no amount
676                          * of effort could recover from errors.  Quite
677                          * possibly the HA just disappeared.
678                          */
679                         SAS_DPRINTK("error from  device %llx, LUN %llx "
680                                     "couldn't be recovered in any way\n",
681                                     SAS_ADDR(task->dev->sas_addr),
682                                     cmd->device->lun);
683
684                         sas_eh_finish_cmd(cmd);
685                         goto clear_q;
686                 }
687         }
688  out:
689         list_splice_tail(&done, work_q);
690         list_splice_tail_init(&ha->eh_ata_q, work_q);
691         return;
692
693  clear_q:
694         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
695         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
696                 sas_eh_finish_cmd(cmd);
697         goto out;
698 }
699
700 static void sas_eh_handle_resets(struct Scsi_Host *shost)
701 {
702         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
703         struct sas_internal *i = to_sas_internal(shost->transportt);
704
705         /* handle directed resets to sas devices */
706         spin_lock_irq(&ha->lock);
707         while (!list_empty(&ha->eh_dev_q)) {
708                 struct domain_device *dev;
709                 struct ssp_device *ssp;
710
711                 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
712                 list_del_init(&ssp->eh_list_node);
713                 dev = container_of(ssp, typeof(*dev), ssp_dev);
714                 kref_get(&dev->kref);
715                 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
716
717                 spin_unlock_irq(&ha->lock);
718
719                 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
720                         i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
721
722                 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
723                         i->dft->lldd_I_T_nexus_reset(dev);
724
725                 sas_put_device(dev);
726                 spin_lock_irq(&ha->lock);
727                 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
728                 ha->eh_active--;
729         }
730         spin_unlock_irq(&ha->lock);
731 }
732
733
734 void sas_scsi_recover_host(struct Scsi_Host *shost)
735 {
736         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
737         LIST_HEAD(eh_work_q);
738         int tries = 0;
739         bool retry;
740
741 retry:
742         tries++;
743         retry = true;
744         spin_lock_irq(shost->host_lock);
745         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
746         spin_unlock_irq(shost->host_lock);
747
748         SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
749                     __func__, atomic_read(&shost->host_busy), shost->host_failed);
750         /*
751          * Deal with commands that still have SAS tasks (i.e. they didn't
752          * complete via the normal sas_task completion mechanism),
753          * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
754          */
755         set_bit(SAS_HA_FROZEN, &ha->state);
756         sas_eh_handle_sas_errors(shost, &eh_work_q);
757         clear_bit(SAS_HA_FROZEN, &ha->state);
758         if (list_empty(&eh_work_q))
759                 goto out;
760
761         /*
762          * Now deal with SCSI commands that completed ok but have a an error
763          * code (and hopefully sense data) attached.  This is roughly what
764          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
765          * command we see here has no sas_task and is thus unknown to the HA.
766          */
767         sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
768         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
769                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
770
771 out:
772         sas_eh_handle_resets(shost);
773
774         /* now link into libata eh --- if we have any ata devices */
775         sas_ata_strategy_handler(shost);
776
777         scsi_eh_flush_done_q(&ha->eh_done_q);
778
779         /* check if any new eh work was scheduled during the last run */
780         spin_lock_irq(&ha->lock);
781         if (ha->eh_active == 0) {
782                 shost->host_eh_scheduled = 0;
783                 retry = false;
784         }
785         spin_unlock_irq(&ha->lock);
786
787         if (retry)
788                 goto retry;
789
790         SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
791                     __func__, atomic_read(&shost->host_busy),
792                     shost->host_failed, tries);
793 }
794
795 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
796 {
797         struct domain_device *dev = sdev_to_domain_dev(sdev);
798
799         if (dev_is_sata(dev))
800                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
801
802         return -EINVAL;
803 }
804
805 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
806 {
807         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
808         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
809         struct domain_device *found_dev = NULL;
810         int i;
811         unsigned long flags;
812
813         spin_lock_irqsave(&ha->phy_port_lock, flags);
814         for (i = 0; i < ha->num_phys; i++) {
815                 struct asd_sas_port *port = ha->sas_port[i];
816                 struct domain_device *dev;
817
818                 spin_lock(&port->dev_list_lock);
819                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
820                         if (rphy == dev->rphy) {
821                                 found_dev = dev;
822                                 spin_unlock(&port->dev_list_lock);
823                                 goto found;
824                         }
825                 }
826                 spin_unlock(&port->dev_list_lock);
827         }
828  found:
829         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
830
831         return found_dev;
832 }
833
834 int sas_target_alloc(struct scsi_target *starget)
835 {
836         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
837         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
838
839         if (!found_dev)
840                 return -ENODEV;
841
842         kref_get(&found_dev->kref);
843         starget->hostdata = found_dev;
844         return 0;
845 }
846
847 #define SAS_DEF_QD 256
848
849 int sas_slave_configure(struct scsi_device *scsi_dev)
850 {
851         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
852
853         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
854
855         if (dev_is_sata(dev)) {
856                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
857                 return 0;
858         }
859
860         sas_read_port_mode_page(scsi_dev);
861
862         if (scsi_dev->tagged_supported) {
863                 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
864         } else {
865                 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
866                             "TCQ\n", SAS_ADDR(dev->sas_addr),
867                             scsi_dev->lun);
868                 scsi_change_queue_depth(scsi_dev, 1);
869         }
870
871         scsi_dev->allow_restart = 1;
872
873         return 0;
874 }
875
876 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
877 {
878         struct domain_device *dev = sdev_to_domain_dev(sdev);
879
880         if (dev_is_sata(dev))
881                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
882
883         if (!sdev->tagged_supported)
884                 depth = 1;
885         return scsi_change_queue_depth(sdev, depth);
886 }
887
888 int sas_bios_param(struct scsi_device *scsi_dev,
889                           struct block_device *bdev,
890                           sector_t capacity, int *hsc)
891 {
892         hsc[0] = 255;
893         hsc[1] = 63;
894         sector_div(capacity, 255*63);
895         hsc[2] = capacity;
896
897         return 0;
898 }
899
900 /*
901  * Tell an upper layer that it needs to initiate an abort for a given task.
902  * This should only ever be called by an LLDD.
903  */
904 void sas_task_abort(struct sas_task *task)
905 {
906         struct scsi_cmnd *sc = task->uldd_task;
907
908         /* Escape for libsas internal commands */
909         if (!sc) {
910                 struct sas_task_slow *slow = task->slow_task;
911
912                 if (!slow)
913                         return;
914                 if (!del_timer(&slow->timer))
915                         return;
916                 slow->timer.function(&slow->timer);
917                 return;
918         }
919
920         if (dev_is_sata(task->dev)) {
921                 sas_ata_task_abort(task);
922         } else {
923                 struct request_queue *q = sc->device->request_queue;
924                 unsigned long flags;
925
926                 spin_lock_irqsave(q->queue_lock, flags);
927                 blk_abort_request(sc->request);
928                 spin_unlock_irqrestore(q->queue_lock, flags);
929         }
930 }
931
932 void sas_target_destroy(struct scsi_target *starget)
933 {
934         struct domain_device *found_dev = starget->hostdata;
935
936         if (!found_dev)
937                 return;
938
939         starget->hostdata = NULL;
940         sas_put_device(found_dev);
941 }
942
943 #define SAS_STRING_ADDR_SIZE    16
944
945 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
946 {
947         int res;
948         const struct firmware *fw;
949
950         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
951         if (res)
952                 return res;
953
954         if (fw->size < SAS_STRING_ADDR_SIZE) {
955                 res = -ENODEV;
956                 goto out;
957         }
958
959         res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
960         if (res)
961                 goto out;
962
963 out:
964         release_firmware(fw);
965         return res;
966 }
967 EXPORT_SYMBOL_GPL(sas_request_addr);
968
969 EXPORT_SYMBOL_GPL(sas_queuecommand);
970 EXPORT_SYMBOL_GPL(sas_target_alloc);
971 EXPORT_SYMBOL_GPL(sas_slave_configure);
972 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
973 EXPORT_SYMBOL_GPL(sas_bios_param);
974 EXPORT_SYMBOL_GPL(sas_task_abort);
975 EXPORT_SYMBOL_GPL(sas_phy_reset);
976 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
977 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
978 EXPORT_SYMBOL_GPL(sas_target_destroy);
979 EXPORT_SYMBOL_GPL(sas_ioctl);