Merge branches 'release', 'button-sysfs', 'misc', 'mismatch', 'randconfig' and 'toshi...
[linux-2.6] / 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
28 #include "sas_internal.h"
29
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_sas.h>
37 #include <scsi/sas_ata.h>
38 #include "../scsi_sas_internal.h"
39 #include "../scsi_transport_api.h"
40 #include "../scsi_priv.h"
41
42 #include <linux/err.h>
43 #include <linux/blkdev.h>
44 #include <linux/freezer.h>
45 #include <linux/scatterlist.h>
46 #include <linux/libata.h>
47
48 /* ---------- SCSI Host glue ---------- */
49
50 static void sas_scsi_task_done(struct sas_task *task)
51 {
52         struct task_status_struct *ts = &task->task_status;
53         struct scsi_cmnd *sc = task->uldd_task;
54         int hs = 0, stat = 0;
55
56         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
57                 /* Aborted tasks will be completed by the error handler */
58                 SAS_DPRINTK("task done but aborted\n");
59                 return;
60         }
61
62         if (unlikely(!sc)) {
63                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
64                 list_del_init(&task->list);
65                 sas_free_task(task);
66                 return;
67         }
68
69         if (ts->resp == SAS_TASK_UNDELIVERED) {
70                 /* transport error */
71                 hs = DID_NO_CONNECT;
72         } else { /* ts->resp == SAS_TASK_COMPLETE */
73                 /* task delivered, what happened afterwards? */
74                 switch (ts->stat) {
75                 case SAS_DEV_NO_RESPONSE:
76                 case SAS_INTERRUPTED:
77                 case SAS_PHY_DOWN:
78                 case SAS_NAK_R_ERR:
79                 case SAS_OPEN_TO:
80                         hs = DID_NO_CONNECT;
81                         break;
82                 case SAS_DATA_UNDERRUN:
83                         scsi_set_resid(sc, ts->residual);
84                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
85                                 hs = DID_ERROR;
86                         break;
87                 case SAS_DATA_OVERRUN:
88                         hs = DID_ERROR;
89                         break;
90                 case SAS_QUEUE_FULL:
91                         hs = DID_SOFT_ERROR; /* retry */
92                         break;
93                 case SAS_DEVICE_UNKNOWN:
94                         hs = DID_BAD_TARGET;
95                         break;
96                 case SAS_SG_ERR:
97                         hs = DID_PARITY;
98                         break;
99                 case SAS_OPEN_REJECT:
100                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
101                                 hs = DID_SOFT_ERROR; /* retry */
102                         else
103                                 hs = DID_ERROR;
104                         break;
105                 case SAS_PROTO_RESPONSE:
106                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
107                                     "task; please report this\n",
108                                     task->dev->port->ha->sas_ha_name);
109                         break;
110                 case SAS_ABORTED_TASK:
111                         hs = DID_ABORT;
112                         break;
113                 case SAM_CHECK_COND:
114                         memcpy(sc->sense_buffer, ts->buf,
115                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
116                         stat = SAM_CHECK_COND;
117                         break;
118                 default:
119                         stat = ts->stat;
120                         break;
121                 }
122         }
123         ASSIGN_SAS_TASK(sc, NULL);
124         sc->result = (hs << 16) | stat;
125         list_del_init(&task->list);
126         sas_free_task(task);
127         sc->scsi_done(sc);
128 }
129
130 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
131 {
132         enum task_attribute ta = TASK_ATTR_SIMPLE;
133         if (cmd->request && blk_rq_tagged(cmd->request)) {
134                 if (cmd->device->ordered_tags &&
135                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
136                         ta = TASK_ATTR_ORDERED;
137         }
138         return ta;
139 }
140
141 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
142                                                struct domain_device *dev,
143                                                gfp_t gfp_flags)
144 {
145         struct sas_task *task = sas_alloc_task(gfp_flags);
146         struct scsi_lun lun;
147
148         if (!task)
149                 return NULL;
150
151         task->uldd_task = cmd;
152         ASSIGN_SAS_TASK(cmd, task);
153
154         task->dev = dev;
155         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
156
157         task->ssp_task.retry_count = 1;
158         int_to_scsilun(cmd->device->lun, &lun);
159         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
160         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
161         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
162
163         task->scatter = scsi_sglist(cmd);
164         task->num_scatter = scsi_sg_count(cmd);
165         task->total_xfer_len = scsi_bufflen(cmd);
166         task->data_dir = cmd->sc_data_direction;
167
168         task->task_done = sas_scsi_task_done;
169
170         return task;
171 }
172
173 int sas_queue_up(struct sas_task *task)
174 {
175         struct sas_ha_struct *sas_ha = task->dev->port->ha;
176         struct scsi_core *core = &sas_ha->core;
177         unsigned long flags;
178         LIST_HEAD(list);
179
180         spin_lock_irqsave(&core->task_queue_lock, flags);
181         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
182                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
183                 return -SAS_QUEUE_FULL;
184         }
185         list_add_tail(&task->list, &core->task_queue);
186         core->task_queue_size += 1;
187         spin_unlock_irqrestore(&core->task_queue_lock, flags);
188         wake_up_process(core->queue_thread);
189
190         return 0;
191 }
192
193 /**
194  * sas_queuecommand -- Enqueue a command for processing
195  * @parameters: See SCSI Core documentation
196  *
197  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
198  * call us without holding an IRQ spinlock...
199  */
200 int sas_queuecommand(struct scsi_cmnd *cmd,
201                      void (*scsi_done)(struct scsi_cmnd *))
202         __releases(host->host_lock)
203         __acquires(dev->sata_dev.ap->lock)
204         __releases(dev->sata_dev.ap->lock)
205         __acquires(host->host_lock)
206 {
207         int res = 0;
208         struct domain_device *dev = cmd_to_domain_dev(cmd);
209         struct Scsi_Host *host = cmd->device->host;
210         struct sas_internal *i = to_sas_internal(host->transportt);
211
212         spin_unlock_irq(host->host_lock);
213
214         {
215                 struct sas_ha_struct *sas_ha = dev->port->ha;
216                 struct sas_task *task;
217
218                 if (dev_is_sata(dev)) {
219                         unsigned long flags;
220
221                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
222                         res = ata_sas_queuecmd(cmd, scsi_done,
223                                                dev->sata_dev.ap);
224                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
225                         goto out;
226                 }
227
228                 res = -ENOMEM;
229                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
230                 if (!task)
231                         goto out;
232
233                 cmd->scsi_done = scsi_done;
234                 /* Queue up, Direct Mode or Task Collector Mode. */
235                 if (sas_ha->lldd_max_execute_num < 2)
236                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
237                 else
238                         res = sas_queue_up(task);
239
240                 /* Examine */
241                 if (res) {
242                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
243                         ASSIGN_SAS_TASK(cmd, NULL);
244                         sas_free_task(task);
245                         if (res == -SAS_QUEUE_FULL) {
246                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
247                                 res = 0;
248                                 scsi_done(cmd);
249                         }
250                         goto out;
251                 }
252         }
253 out:
254         spin_lock_irq(host->host_lock);
255         return res;
256 }
257
258 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
259 {
260         struct sas_task *task = TO_SAS_TASK(cmd);
261         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
262
263         /* remove the aborted task flag to allow the task to be
264          * completed now. At this point, we only get called following
265          * an actual abort of the task, so we should be guaranteed not
266          * to be racing with any completions from the LLD (hence we
267          * don't need the task state lock to clear the flag) */
268         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
269         /* Now call task_done.  However, task will be free'd after
270          * this */
271         task->task_done(task);
272         /* now finish the command and move it on to the error
273          * handler done list, this also takes it off the
274          * error handler pending list */
275         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
276 }
277
278 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
279 {
280         struct scsi_cmnd *cmd, *n;
281
282         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
283                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
284                     cmd->device->lun == my_cmd->device->lun)
285                         sas_eh_finish_cmd(cmd);
286         }
287 }
288
289 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
290                                      struct domain_device *dev)
291 {
292         struct scsi_cmnd *cmd, *n;
293
294         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
295                 struct domain_device *x = cmd_to_domain_dev(cmd);
296
297                 if (x == dev)
298                         sas_eh_finish_cmd(cmd);
299         }
300 }
301
302 static void sas_scsi_clear_queue_port(struct list_head *error_q,
303                                       struct asd_sas_port *port)
304 {
305         struct scsi_cmnd *cmd, *n;
306
307         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
308                 struct domain_device *dev = cmd_to_domain_dev(cmd);
309                 struct asd_sas_port *x = dev->port;
310
311                 if (x == port)
312                         sas_eh_finish_cmd(cmd);
313         }
314 }
315
316 enum task_disposition {
317         TASK_IS_DONE,
318         TASK_IS_ABORTED,
319         TASK_IS_AT_LU,
320         TASK_IS_NOT_AT_LU,
321         TASK_ABORT_FAILED,
322 };
323
324 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
325 {
326         struct sas_ha_struct *ha = task->dev->port->ha;
327         unsigned long flags;
328         int i, res;
329         struct sas_internal *si =
330                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
331
332         if (ha->lldd_max_execute_num > 1) {
333                 struct scsi_core *core = &ha->core;
334                 struct sas_task *t, *n;
335
336                 spin_lock_irqsave(&core->task_queue_lock, flags);
337                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
338                         if (task == t) {
339                                 list_del_init(&t->list);
340                                 spin_unlock_irqrestore(&core->task_queue_lock,
341                                                        flags);
342                                 SAS_DPRINTK("%s: task 0x%p aborted from "
343                                             "task_queue\n",
344                                             __FUNCTION__, task);
345                                 return TASK_IS_ABORTED;
346                         }
347                 }
348                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
349         }
350
351         for (i = 0; i < 5; i++) {
352                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
353                 res = si->dft->lldd_abort_task(task);
354
355                 spin_lock_irqsave(&task->task_state_lock, flags);
356                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
357                         spin_unlock_irqrestore(&task->task_state_lock, flags);
358                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
359                                     task);
360                         return TASK_IS_DONE;
361                 }
362                 spin_unlock_irqrestore(&task->task_state_lock, flags);
363
364                 if (res == TMF_RESP_FUNC_COMPLETE) {
365                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
366                                     __FUNCTION__, task);
367                         return TASK_IS_ABORTED;
368                 } else if (si->dft->lldd_query_task) {
369                         SAS_DPRINTK("%s: querying task 0x%p\n",
370                                     __FUNCTION__, task);
371                         res = si->dft->lldd_query_task(task);
372                         switch (res) {
373                         case TMF_RESP_FUNC_SUCC:
374                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
375                                             __FUNCTION__, task);
376                                 return TASK_IS_AT_LU;
377                         case TMF_RESP_FUNC_COMPLETE:
378                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
379                                             __FUNCTION__, task);
380                                 return TASK_IS_NOT_AT_LU;
381                         case TMF_RESP_FUNC_FAILED:
382                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
383                                                 __FUNCTION__, task);
384                                 return TASK_ABORT_FAILED;
385                         }
386
387                 }
388         }
389         return res;
390 }
391
392 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
393 {
394         int res = TMF_RESP_FUNC_FAILED;
395         struct scsi_lun lun;
396         struct sas_internal *i =
397                 to_sas_internal(dev->port->ha->core.shost->transportt);
398
399         int_to_scsilun(cmd->device->lun, &lun);
400
401         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
402                     SAS_ADDR(dev->sas_addr),
403                     cmd->device->lun);
404
405         if (i->dft->lldd_abort_task_set)
406                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
407
408         if (res == TMF_RESP_FUNC_FAILED) {
409                 if (i->dft->lldd_clear_task_set)
410                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
411         }
412
413         if (res == TMF_RESP_FUNC_FAILED) {
414                 if (i->dft->lldd_lu_reset)
415                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
416         }
417
418         return res;
419 }
420
421 static int sas_recover_I_T(struct domain_device *dev)
422 {
423         int res = TMF_RESP_FUNC_FAILED;
424         struct sas_internal *i =
425                 to_sas_internal(dev->port->ha->core.shost->transportt);
426
427         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
428                     SAS_ADDR(dev->sas_addr));
429
430         if (i->dft->lldd_I_T_nexus_reset)
431                 res = i->dft->lldd_I_T_nexus_reset(dev);
432
433         return res;
434 }
435
436 /* Find the sas_phy that's attached to this device */
437 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
438 {
439         struct domain_device *pdev = dev->parent;
440         struct ex_phy *exphy = NULL;
441         int i;
442
443         /* Directly attached device */
444         if (!pdev)
445                 return dev->port->phy;
446
447         /* Otherwise look in the expander */
448         for (i = 0; i < pdev->ex_dev.num_phys; i++)
449                 if (!memcmp(dev->sas_addr,
450                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
451                             SAS_ADDR_SIZE)) {
452                         exphy = &pdev->ex_dev.ex_phy[i];
453                         break;
454                 }
455
456         BUG_ON(!exphy);
457         return exphy->phy;
458 }
459 EXPORT_SYMBOL_GPL(sas_find_local_phy);
460
461 /* Attempt to send a LUN reset message to a device */
462 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
463 {
464         struct domain_device *dev = cmd_to_domain_dev(cmd);
465         struct sas_internal *i =
466                 to_sas_internal(dev->port->ha->core.shost->transportt);
467         struct scsi_lun lun;
468         int res;
469
470         int_to_scsilun(cmd->device->lun, &lun);
471
472         if (!i->dft->lldd_lu_reset)
473                 return FAILED;
474
475         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
476         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
477                 return SUCCESS;
478
479         return FAILED;
480 }
481
482 /* Attempt to send a phy (bus) reset */
483 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
484 {
485         struct domain_device *dev = cmd_to_domain_dev(cmd);
486         struct sas_phy *phy = sas_find_local_phy(dev);
487         int res;
488
489         res = sas_phy_reset(phy, 1);
490         if (res)
491                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
492                             kobject_name(&phy->dev.kobj),
493                             res);
494         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
495                 return SUCCESS;
496
497         return FAILED;
498 }
499
500 /* Try to reset a device */
501 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
502 {
503         int res;
504         struct Scsi_Host *shost = cmd->device->host;
505
506         if (!shost->hostt->eh_device_reset_handler)
507                 goto try_bus_reset;
508
509         res = shost->hostt->eh_device_reset_handler(cmd);
510         if (res == SUCCESS)
511                 return res;
512
513 try_bus_reset:
514         if (shost->hostt->eh_bus_reset_handler)
515                 return shost->hostt->eh_bus_reset_handler(cmd);
516
517         return FAILED;
518 }
519
520 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
521                                     struct list_head *work_q,
522                                     struct list_head *done_q)
523 {
524         struct scsi_cmnd *cmd, *n;
525         enum task_disposition res = TASK_IS_DONE;
526         int tmf_resp, need_reset;
527         struct sas_internal *i = to_sas_internal(shost->transportt);
528         unsigned long flags;
529         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
530
531 Again:
532         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
533                 struct sas_task *task = TO_SAS_TASK(cmd);
534
535                 if (!task)
536                         continue;
537
538                 list_del_init(&cmd->eh_entry);
539
540                 spin_lock_irqsave(&task->task_state_lock, flags);
541                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
542                 spin_unlock_irqrestore(&task->task_state_lock, flags);
543
544                 if (need_reset) {
545                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
546                                     __FUNCTION__, task);
547                         goto reset;
548                 }
549
550                 SAS_DPRINTK("trying to find task 0x%p\n", task);
551                 res = sas_scsi_find_task(task);
552
553                 cmd->eh_eflags = 0;
554
555                 switch (res) {
556                 case TASK_IS_DONE:
557                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
558                                     task);
559                         sas_eh_finish_cmd(cmd);
560                         continue;
561                 case TASK_IS_ABORTED:
562                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
563                                     __FUNCTION__, task);
564                         sas_eh_finish_cmd(cmd);
565                         continue;
566                 case TASK_IS_AT_LU:
567                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
568  reset:
569                         tmf_resp = sas_recover_lu(task->dev, cmd);
570                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
571                                 SAS_DPRINTK("dev %016llx LU %x is "
572                                             "recovered\n",
573                                             SAS_ADDR(task->dev),
574                                             cmd->device->lun);
575                                 sas_eh_finish_cmd(cmd);
576                                 sas_scsi_clear_queue_lu(work_q, cmd);
577                                 goto Again;
578                         }
579                         /* fallthrough */
580                 case TASK_IS_NOT_AT_LU:
581                 case TASK_ABORT_FAILED:
582                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
583                                     task);
584                         tmf_resp = sas_recover_I_T(task->dev);
585                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
586                                 struct domain_device *dev = task->dev;
587                                 SAS_DPRINTK("I_T %016llx recovered\n",
588                                             SAS_ADDR(task->dev->sas_addr));
589                                 sas_eh_finish_cmd(cmd);
590                                 sas_scsi_clear_queue_I_T(work_q, dev);
591                                 goto Again;
592                         }
593                         /* Hammer time :-) */
594                         try_to_reset_cmd_device(cmd);
595                         if (i->dft->lldd_clear_nexus_port) {
596                                 struct asd_sas_port *port = task->dev->port;
597                                 SAS_DPRINTK("clearing nexus for port:%d\n",
598                                             port->id);
599                                 res = i->dft->lldd_clear_nexus_port(port);
600                                 if (res == TMF_RESP_FUNC_COMPLETE) {
601                                         SAS_DPRINTK("clear nexus port:%d "
602                                                     "succeeded\n", port->id);
603                                         sas_eh_finish_cmd(cmd);
604                                         sas_scsi_clear_queue_port(work_q,
605                                                                   port);
606                                         goto Again;
607                                 }
608                         }
609                         if (i->dft->lldd_clear_nexus_ha) {
610                                 SAS_DPRINTK("clear nexus ha\n");
611                                 res = i->dft->lldd_clear_nexus_ha(ha);
612                                 if (res == TMF_RESP_FUNC_COMPLETE) {
613                                         SAS_DPRINTK("clear nexus ha "
614                                                     "succeeded\n");
615                                         sas_eh_finish_cmd(cmd);
616                                         goto clear_q;
617                                 }
618                         }
619                         /* If we are here -- this means that no amount
620                          * of effort could recover from errors.  Quite
621                          * possibly the HA just disappeared.
622                          */
623                         SAS_DPRINTK("error from  device %llx, LUN %x "
624                                     "couldn't be recovered in any way\n",
625                                     SAS_ADDR(task->dev->sas_addr),
626                                     cmd->device->lun);
627
628                         sas_eh_finish_cmd(cmd);
629                         goto clear_q;
630                 }
631         }
632         return list_empty(work_q);
633 clear_q:
634         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
635         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
636                 sas_eh_finish_cmd(cmd);
637
638         return list_empty(work_q);
639 }
640
641 void sas_scsi_recover_host(struct Scsi_Host *shost)
642 {
643         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
644         unsigned long flags;
645         LIST_HEAD(eh_work_q);
646
647         spin_lock_irqsave(shost->host_lock, flags);
648         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
649         spin_unlock_irqrestore(shost->host_lock, flags);
650
651         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
652         /*
653          * Deal with commands that still have SAS tasks (i.e. they didn't
654          * complete via the normal sas_task completion mechanism)
655          */
656         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
657                 goto out;
658
659         /*
660          * Now deal with SCSI commands that completed ok but have a an error
661          * code (and hopefully sense data) attached.  This is roughly what
662          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
663          * command we see here has no sas_task and is thus unknown to the HA.
664          */
665         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
666                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
667
668 out:
669         scsi_eh_flush_done_q(&ha->eh_done_q);
670         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
671         return;
672 }
673
674 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
675 {
676         struct sas_task *task = TO_SAS_TASK(cmd);
677         unsigned long flags;
678
679         if (!task) {
680                 cmd->timeout_per_command /= 2;
681                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
682                             cmd, task, (cmd->timeout_per_command ?
683                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
684                 if (!cmd->timeout_per_command)
685                         return EH_NOT_HANDLED;
686                 return EH_RESET_TIMER;
687         }
688
689         spin_lock_irqsave(&task->task_state_lock, flags);
690         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
691         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
692                 spin_unlock_irqrestore(&task->task_state_lock, flags);
693                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
694                             cmd, task);
695                 return EH_HANDLED;
696         }
697         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
698                 spin_unlock_irqrestore(&task->task_state_lock, flags);
699                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
700                             "EH_RESET_TIMER\n",
701                             cmd, task);
702                 return EH_RESET_TIMER;
703         }
704         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
705         spin_unlock_irqrestore(&task->task_state_lock, flags);
706
707         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
708                     cmd, task);
709
710         return EH_NOT_HANDLED;
711 }
712
713 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
714 {
715         struct domain_device *dev = sdev_to_domain_dev(sdev);
716
717         if (dev_is_sata(dev))
718                 return ata_scsi_ioctl(sdev, cmd, arg);
719
720         return -EINVAL;
721 }
722
723 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
724 {
725         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
726         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
727         struct domain_device *found_dev = NULL;
728         int i;
729         unsigned long flags;
730
731         spin_lock_irqsave(&ha->phy_port_lock, flags);
732         for (i = 0; i < ha->num_phys; i++) {
733                 struct asd_sas_port *port = ha->sas_port[i];
734                 struct domain_device *dev;
735
736                 spin_lock(&port->dev_list_lock);
737                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
738                         if (rphy == dev->rphy) {
739                                 found_dev = dev;
740                                 spin_unlock(&port->dev_list_lock);
741                                 goto found;
742                         }
743                 }
744                 spin_unlock(&port->dev_list_lock);
745         }
746  found:
747         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
748
749         return found_dev;
750 }
751
752 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
753 {
754         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
755
756         return sas_find_dev_by_rphy(rphy);
757 }
758
759 int sas_target_alloc(struct scsi_target *starget)
760 {
761         struct domain_device *found_dev = sas_find_target(starget);
762         int res;
763
764         if (!found_dev)
765                 return -ENODEV;
766
767         if (dev_is_sata(found_dev)) {
768                 res = sas_ata_init_host_and_port(found_dev, starget);
769                 if (res)
770                         return res;
771         }
772
773         starget->hostdata = found_dev;
774         return 0;
775 }
776
777 #define SAS_DEF_QD 32
778 #define SAS_MAX_QD 64
779
780 int sas_slave_configure(struct scsi_device *scsi_dev)
781 {
782         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
783         struct sas_ha_struct *sas_ha;
784
785         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
786
787         if (dev_is_sata(dev)) {
788                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
789                 return 0;
790         }
791
792         sas_ha = dev->port->ha;
793
794         sas_read_port_mode_page(scsi_dev);
795
796         if (scsi_dev->tagged_supported) {
797                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
798                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
799         } else {
800                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
801                             "TCQ\n", SAS_ADDR(dev->sas_addr),
802                             scsi_dev->lun);
803                 scsi_dev->tagged_supported = 0;
804                 scsi_set_tag_type(scsi_dev, 0);
805                 scsi_deactivate_tcq(scsi_dev, 1);
806         }
807
808         scsi_dev->allow_restart = 1;
809
810         return 0;
811 }
812
813 void sas_slave_destroy(struct scsi_device *scsi_dev)
814 {
815         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
816
817         if (dev_is_sata(dev))
818                 ata_port_disable(dev->sata_dev.ap);
819 }
820
821 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
822 {
823         int res = min(new_depth, SAS_MAX_QD);
824
825         if (scsi_dev->tagged_supported)
826                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
827                                         res);
828         else {
829                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
830                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
831                            SAS_ADDR(dev->sas_addr),
832                            scsi_dev->lun);
833                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
834                 res = 1;
835         }
836
837         return res;
838 }
839
840 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
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         spin_lock_irqsave(&core->task_queue_lock, flags);
877         while (!kthread_should_stop() &&
878                !list_empty(&core->task_queue)) {
879
880                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
881                 if (can_queue >= 0) {
882                         can_queue = core->task_queue_size;
883                         list_splice_init(&core->task_queue, &q);
884                 } else {
885                         struct list_head *a, *n;
886
887                         can_queue = sas_ha->lldd_queue_size;
888                         list_for_each_safe(a, n, &core->task_queue) {
889                                 list_move_tail(a, &q);
890                                 if (--can_queue == 0)
891                                         break;
892                         }
893                         can_queue = sas_ha->lldd_queue_size;
894                 }
895                 core->task_queue_size -= can_queue;
896                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
897                 {
898                         struct sas_task *task = list_entry(q.next,
899                                                            struct sas_task,
900                                                            list);
901                         list_del_init(&q);
902                         res = i->dft->lldd_execute_task(task, can_queue,
903                                                         GFP_KERNEL);
904                         if (unlikely(res))
905                                 __list_add(&q, task->list.prev, &task->list);
906                 }
907                 spin_lock_irqsave(&core->task_queue_lock, flags);
908                 if (res) {
909                         list_splice_init(&q, &core->task_queue); /*at head*/
910                         core->task_queue_size += can_queue;
911                 }
912         }
913         spin_unlock_irqrestore(&core->task_queue_lock, flags);
914 }
915
916 /**
917  * sas_queue_thread -- The Task Collector thread
918  * @_sas_ha: pointer to struct sas_ha
919  */
920 static int sas_queue_thread(void *_sas_ha)
921 {
922         struct sas_ha_struct *sas_ha = _sas_ha;
923
924         while (1) {
925                 set_current_state(TASK_INTERRUPTIBLE);
926                 schedule();
927                 sas_queue(sas_ha);
928                 if (kthread_should_stop())
929                         break;
930         }
931
932         return 0;
933 }
934
935 int sas_init_queue(struct sas_ha_struct *sas_ha)
936 {
937         struct scsi_core *core = &sas_ha->core;
938
939         spin_lock_init(&core->task_queue_lock);
940         core->task_queue_size = 0;
941         INIT_LIST_HEAD(&core->task_queue);
942
943         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
944                                          "sas_queue_%d", core->shost->host_no);
945         if (IS_ERR(core->queue_thread))
946                 return PTR_ERR(core->queue_thread);
947         return 0;
948 }
949
950 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
951 {
952         unsigned long flags;
953         struct scsi_core *core = &sas_ha->core;
954         struct sas_task *task, *n;
955
956         kthread_stop(core->queue_thread);
957
958         if (!list_empty(&core->task_queue))
959                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
960                             SAS_ADDR(sas_ha->sas_addr));
961
962         spin_lock_irqsave(&core->task_queue_lock, flags);
963         list_for_each_entry_safe(task, n, &core->task_queue, list) {
964                 struct scsi_cmnd *cmd = task->uldd_task;
965
966                 list_del_init(&task->list);
967
968                 ASSIGN_SAS_TASK(cmd, NULL);
969                 sas_free_task(task);
970                 cmd->result = DID_ABORT << 16;
971                 cmd->scsi_done(cmd);
972         }
973         spin_unlock_irqrestore(&core->task_queue_lock, flags);
974 }
975
976 /*
977  * Call the LLDD task abort routine directly.  This function is intended for
978  * use by upper layers that need to tell the LLDD to abort a task.
979  */
980 int __sas_task_abort(struct sas_task *task)
981 {
982         struct sas_internal *si =
983                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
984         unsigned long flags;
985         int res;
986
987         spin_lock_irqsave(&task->task_state_lock, flags);
988         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
989             task->task_state_flags & SAS_TASK_STATE_DONE) {
990                 spin_unlock_irqrestore(&task->task_state_lock, flags);
991                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
992                             task);
993                 return 0;
994         }
995         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
996         spin_unlock_irqrestore(&task->task_state_lock, flags);
997
998         if (!si->dft->lldd_abort_task)
999                 return -ENODEV;
1000
1001         res = si->dft->lldd_abort_task(task);
1002
1003         spin_lock_irqsave(&task->task_state_lock, flags);
1004         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1005             (res == TMF_RESP_FUNC_COMPLETE))
1006         {
1007                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1008                 task->task_done(task);
1009                 return 0;
1010         }
1011
1012         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1013                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1014         spin_unlock_irqrestore(&task->task_state_lock, flags);
1015
1016         return -EAGAIN;
1017 }
1018
1019 /*
1020  * Tell an upper layer that it needs to initiate an abort for a given task.
1021  * This should only ever be called by an LLDD.
1022  */
1023 void sas_task_abort(struct sas_task *task)
1024 {
1025         struct scsi_cmnd *sc = task->uldd_task;
1026
1027         /* Escape for libsas internal commands */
1028         if (!sc) {
1029                 if (!del_timer(&task->timer))
1030                         return;
1031                 task->timer.function(task->timer.data);
1032                 return;
1033         }
1034
1035         if (dev_is_sata(task->dev)) {
1036                 sas_ata_task_abort(task);
1037                 return;
1038         }
1039
1040         scsi_req_abort_cmd(sc);
1041         scsi_schedule_eh(sc->device->host);
1042 }
1043
1044 int sas_slave_alloc(struct scsi_device *scsi_dev)
1045 {
1046         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1047
1048         if (dev_is_sata(dev))
1049                 return ata_sas_port_init(dev->sata_dev.ap);
1050
1051         return 0;
1052 }
1053
1054 void sas_target_destroy(struct scsi_target *starget)
1055 {
1056         struct domain_device *found_dev = sas_find_target(starget);
1057
1058         if (!found_dev)
1059                 return;
1060
1061         if (dev_is_sata(found_dev))
1062                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1063
1064         return;
1065 }
1066
1067 EXPORT_SYMBOL_GPL(sas_queuecommand);
1068 EXPORT_SYMBOL_GPL(sas_target_alloc);
1069 EXPORT_SYMBOL_GPL(sas_slave_configure);
1070 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1071 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1072 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1073 EXPORT_SYMBOL_GPL(sas_bios_param);
1074 EXPORT_SYMBOL_GPL(__sas_task_abort);
1075 EXPORT_SYMBOL_GPL(sas_task_abort);
1076 EXPORT_SYMBOL_GPL(sas_phy_reset);
1077 EXPORT_SYMBOL_GPL(sas_phy_enable);
1078 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1079 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1080 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1081 EXPORT_SYMBOL_GPL(sas_target_destroy);
1082 EXPORT_SYMBOL_GPL(sas_ioctl);