50db8f971a06644532681bf0aabdd6636e98adbd
[linux-2.6.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
123         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
124                 /* Aborted tasks will be completed by the error handler */
125                 SAS_DPRINTK("task done but aborted\n");
126                 return;
127         }
128
129         if (unlikely(!sc)) {
130                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
131                 list_del_init(&task->list);
132                 sas_free_task(task);
133                 return;
134         }
135
136         ASSIGN_SAS_TASK(sc, NULL);
137         sas_end_task(sc, task);
138         sc->scsi_done(sc);
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 = TASK_ATTR_SIMPLE;
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 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
194 {
195         struct sas_internal *i = to_sas_internal(host->transportt);
196         struct domain_device *dev = cmd_to_domain_dev(cmd);
197         struct sas_ha_struct *sas_ha = dev->port->ha;
198         struct sas_task *task;
199         int res = 0;
200
201         /* If the device fell off, no sense in issuing commands */
202         if (test_bit(SAS_DEV_GONE, &dev->state)) {
203                 cmd->result = DID_BAD_TARGET << 16;
204                 goto out_done;
205         }
206
207         if (dev_is_sata(dev)) {
208                 spin_lock_irq(dev->sata_dev.ap->lock);
209                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
210                 spin_unlock_irq(dev->sata_dev.ap->lock);
211                 return res;
212         }
213
214         task = sas_create_task(cmd, dev, GFP_ATOMIC);
215         if (!task)
216                 return SCSI_MLQUEUE_HOST_BUSY;
217
218         /* Queue up, Direct Mode or Task Collector Mode. */
219         if (sas_ha->lldd_max_execute_num < 2)
220                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
221         else
222                 res = sas_queue_up(task);
223
224         if (res)
225                 goto out_free_task;
226         return 0;
227
228 out_free_task:
229         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
230         ASSIGN_SAS_TASK(cmd, NULL);
231         sas_free_task(task);
232         if (res == -SAS_QUEUE_FULL)
233                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
234         else
235                 cmd->result = DID_ERROR << 16;
236 out_done:
237         cmd->scsi_done(cmd);
238         return 0;
239 }
240
241 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
242 {
243         struct sas_task *task = TO_SAS_TASK(cmd);
244         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
245
246         /* At this point, we only get called following an actual abort
247          * of the task, so we should be guaranteed not to be racing with
248          * any completions from the LLD.  Task is freed after this.
249          */
250         sas_end_task(cmd, task);
251
252         /* now finish the command and move it on to the error
253          * handler done list, this also takes it off the
254          * error handler pending list.
255          */
256         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
257 }
258
259 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
260 {
261         struct scsi_cmnd *cmd, *n;
262
263         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
264                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
265                     cmd->device->lun == my_cmd->device->lun)
266                         sas_eh_finish_cmd(cmd);
267         }
268 }
269
270 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
271                                      struct domain_device *dev)
272 {
273         struct scsi_cmnd *cmd, *n;
274
275         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
276                 struct domain_device *x = cmd_to_domain_dev(cmd);
277
278                 if (x == dev)
279                         sas_eh_finish_cmd(cmd);
280         }
281 }
282
283 static void sas_scsi_clear_queue_port(struct list_head *error_q,
284                                       struct asd_sas_port *port)
285 {
286         struct scsi_cmnd *cmd, *n;
287
288         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
289                 struct domain_device *dev = cmd_to_domain_dev(cmd);
290                 struct asd_sas_port *x = dev->port;
291
292                 if (x == port)
293                         sas_eh_finish_cmd(cmd);
294         }
295 }
296
297 enum task_disposition {
298         TASK_IS_DONE,
299         TASK_IS_ABORTED,
300         TASK_IS_AT_LU,
301         TASK_IS_NOT_AT_LU,
302         TASK_ABORT_FAILED,
303 };
304
305 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
306 {
307         struct sas_ha_struct *ha = task->dev->port->ha;
308         unsigned long flags;
309         int i, res;
310         struct sas_internal *si =
311                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
312
313         if (ha->lldd_max_execute_num > 1) {
314                 struct scsi_core *core = &ha->core;
315                 struct sas_task *t, *n;
316
317                 spin_lock_irqsave(&core->task_queue_lock, flags);
318                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
319                         if (task == t) {
320                                 list_del_init(&t->list);
321                                 spin_unlock_irqrestore(&core->task_queue_lock,
322                                                        flags);
323                                 SAS_DPRINTK("%s: task 0x%p aborted from "
324                                             "task_queue\n",
325                                             __func__, task);
326                                 return TASK_IS_ABORTED;
327                         }
328                 }
329                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
330         }
331
332         for (i = 0; i < 5; i++) {
333                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
334                 res = si->dft->lldd_abort_task(task);
335
336                 spin_lock_irqsave(&task->task_state_lock, flags);
337                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
338                         spin_unlock_irqrestore(&task->task_state_lock, flags);
339                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
340                                     task);
341                         return TASK_IS_DONE;
342                 }
343                 spin_unlock_irqrestore(&task->task_state_lock, flags);
344
345                 if (res == TMF_RESP_FUNC_COMPLETE) {
346                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
347                                     __func__, task);
348                         return TASK_IS_ABORTED;
349                 } else if (si->dft->lldd_query_task) {
350                         SAS_DPRINTK("%s: querying task 0x%p\n",
351                                     __func__, task);
352                         res = si->dft->lldd_query_task(task);
353                         switch (res) {
354                         case TMF_RESP_FUNC_SUCC:
355                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
356                                             __func__, task);
357                                 return TASK_IS_AT_LU;
358                         case TMF_RESP_FUNC_COMPLETE:
359                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
360                                             __func__, task);
361                                 return TASK_IS_NOT_AT_LU;
362                         case TMF_RESP_FUNC_FAILED:
363                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
364                                                 __func__, task);
365                                 return TASK_ABORT_FAILED;
366                         }
367
368                 }
369         }
370         return res;
371 }
372
373 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
374 {
375         int res = TMF_RESP_FUNC_FAILED;
376         struct scsi_lun lun;
377         struct sas_internal *i =
378                 to_sas_internal(dev->port->ha->core.shost->transportt);
379
380         int_to_scsilun(cmd->device->lun, &lun);
381
382         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
383                     SAS_ADDR(dev->sas_addr),
384                     cmd->device->lun);
385
386         if (i->dft->lldd_abort_task_set)
387                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
388
389         if (res == TMF_RESP_FUNC_FAILED) {
390                 if (i->dft->lldd_clear_task_set)
391                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
392         }
393
394         if (res == TMF_RESP_FUNC_FAILED) {
395                 if (i->dft->lldd_lu_reset)
396                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
397         }
398
399         return res;
400 }
401
402 static int sas_recover_I_T(struct domain_device *dev)
403 {
404         int res = TMF_RESP_FUNC_FAILED;
405         struct sas_internal *i =
406                 to_sas_internal(dev->port->ha->core.shost->transportt);
407
408         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
409                     SAS_ADDR(dev->sas_addr));
410
411         if (i->dft->lldd_I_T_nexus_reset)
412                 res = i->dft->lldd_I_T_nexus_reset(dev);
413
414         return res;
415 }
416
417 /* Find the sas_phy that's attached to this device */
418 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
419 {
420         struct domain_device *pdev = dev->parent;
421         struct ex_phy *exphy = NULL;
422         int i;
423
424         /* Directly attached device */
425         if (!pdev)
426                 return dev->port->phy;
427
428         /* Otherwise look in the expander */
429         for (i = 0; i < pdev->ex_dev.num_phys; i++)
430                 if (!memcmp(dev->sas_addr,
431                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
432                             SAS_ADDR_SIZE)) {
433                         exphy = &pdev->ex_dev.ex_phy[i];
434                         break;
435                 }
436
437         BUG_ON(!exphy);
438         return exphy->phy;
439 }
440 EXPORT_SYMBOL_GPL(sas_find_local_phy);
441
442 /* Attempt to send a LUN reset message to a device */
443 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
444 {
445         struct domain_device *dev = cmd_to_domain_dev(cmd);
446         struct sas_internal *i =
447                 to_sas_internal(dev->port->ha->core.shost->transportt);
448         struct scsi_lun lun;
449         int res;
450
451         int_to_scsilun(cmd->device->lun, &lun);
452
453         if (!i->dft->lldd_lu_reset)
454                 return FAILED;
455
456         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
457         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
458                 return SUCCESS;
459
460         return FAILED;
461 }
462
463 /* Attempt to send a phy (bus) reset */
464 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
465 {
466         struct domain_device *dev = cmd_to_domain_dev(cmd);
467         struct sas_phy *phy = sas_find_local_phy(dev);
468         int res;
469
470         res = sas_phy_reset(phy, 1);
471         if (res)
472                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
473                             kobject_name(&phy->dev.kobj),
474                             res);
475         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
476                 return SUCCESS;
477
478         return FAILED;
479 }
480
481 /* Try to reset a device */
482 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
483 {
484         int res;
485         struct Scsi_Host *shost = cmd->device->host;
486
487         if (!shost->hostt->eh_device_reset_handler)
488                 goto try_bus_reset;
489
490         res = shost->hostt->eh_device_reset_handler(cmd);
491         if (res == SUCCESS)
492                 return res;
493
494 try_bus_reset:
495         if (shost->hostt->eh_bus_reset_handler)
496                 return shost->hostt->eh_bus_reset_handler(cmd);
497
498         return FAILED;
499 }
500
501 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
502                                     struct list_head *work_q,
503                                     struct list_head *done_q)
504 {
505         struct scsi_cmnd *cmd, *n;
506         enum task_disposition res = TASK_IS_DONE;
507         int tmf_resp, need_reset;
508         struct sas_internal *i = to_sas_internal(shost->transportt);
509         unsigned long flags;
510         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
511
512 Again:
513         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
514                 struct sas_task *task = TO_SAS_TASK(cmd);
515
516                 if (!task)
517                         continue;
518
519                 list_del_init(&cmd->eh_entry);
520
521                 spin_lock_irqsave(&task->task_state_lock, flags);
522                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
523                 spin_unlock_irqrestore(&task->task_state_lock, flags);
524
525                 if (need_reset) {
526                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
527                                     __func__, task);
528                         goto reset;
529                 }
530
531                 SAS_DPRINTK("trying to find task 0x%p\n", task);
532                 res = sas_scsi_find_task(task);
533
534                 cmd->eh_eflags = 0;
535
536                 switch (res) {
537                 case TASK_IS_DONE:
538                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
539                                     task);
540                         sas_eh_finish_cmd(cmd);
541                         continue;
542                 case TASK_IS_ABORTED:
543                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
544                                     __func__, task);
545                         sas_eh_finish_cmd(cmd);
546                         continue;
547                 case TASK_IS_AT_LU:
548                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
549  reset:
550                         tmf_resp = sas_recover_lu(task->dev, cmd);
551                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
552                                 SAS_DPRINTK("dev %016llx LU %x is "
553                                             "recovered\n",
554                                             SAS_ADDR(task->dev),
555                                             cmd->device->lun);
556                                 sas_eh_finish_cmd(cmd);
557                                 sas_scsi_clear_queue_lu(work_q, cmd);
558                                 goto Again;
559                         }
560                         /* fallthrough */
561                 case TASK_IS_NOT_AT_LU:
562                 case TASK_ABORT_FAILED:
563                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
564                                     task);
565                         tmf_resp = sas_recover_I_T(task->dev);
566                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
567                                 struct domain_device *dev = task->dev;
568                                 SAS_DPRINTK("I_T %016llx recovered\n",
569                                             SAS_ADDR(task->dev->sas_addr));
570                                 sas_eh_finish_cmd(cmd);
571                                 sas_scsi_clear_queue_I_T(work_q, dev);
572                                 goto Again;
573                         }
574                         /* Hammer time :-) */
575                         try_to_reset_cmd_device(cmd);
576                         if (i->dft->lldd_clear_nexus_port) {
577                                 struct asd_sas_port *port = task->dev->port;
578                                 SAS_DPRINTK("clearing nexus for port:%d\n",
579                                             port->id);
580                                 res = i->dft->lldd_clear_nexus_port(port);
581                                 if (res == TMF_RESP_FUNC_COMPLETE) {
582                                         SAS_DPRINTK("clear nexus port:%d "
583                                                     "succeeded\n", port->id);
584                                         sas_eh_finish_cmd(cmd);
585                                         sas_scsi_clear_queue_port(work_q,
586                                                                   port);
587                                         goto Again;
588                                 }
589                         }
590                         if (i->dft->lldd_clear_nexus_ha) {
591                                 SAS_DPRINTK("clear nexus ha\n");
592                                 res = i->dft->lldd_clear_nexus_ha(ha);
593                                 if (res == TMF_RESP_FUNC_COMPLETE) {
594                                         SAS_DPRINTK("clear nexus ha "
595                                                     "succeeded\n");
596                                         sas_eh_finish_cmd(cmd);
597                                         goto clear_q;
598                                 }
599                         }
600                         /* If we are here -- this means that no amount
601                          * of effort could recover from errors.  Quite
602                          * possibly the HA just disappeared.
603                          */
604                         SAS_DPRINTK("error from  device %llx, LUN %x "
605                                     "couldn't be recovered in any way\n",
606                                     SAS_ADDR(task->dev->sas_addr),
607                                     cmd->device->lun);
608
609                         sas_eh_finish_cmd(cmd);
610                         goto clear_q;
611                 }
612         }
613         return list_empty(work_q);
614 clear_q:
615         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
616         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
617                 sas_eh_finish_cmd(cmd);
618
619         return list_empty(work_q);
620 }
621
622 void sas_scsi_recover_host(struct Scsi_Host *shost)
623 {
624         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
625         unsigned long flags;
626         LIST_HEAD(eh_work_q);
627
628         spin_lock_irqsave(shost->host_lock, flags);
629         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
630         shost->host_eh_scheduled = 0;
631         spin_unlock_irqrestore(shost->host_lock, flags);
632
633         SAS_DPRINTK("Enter %s\n", __func__);
634         /*
635          * Deal with commands that still have SAS tasks (i.e. they didn't
636          * complete via the normal sas_task completion mechanism)
637          */
638         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
639                 goto out;
640
641         /*
642          * Now deal with SCSI commands that completed ok but have a an error
643          * code (and hopefully sense data) attached.  This is roughly what
644          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
645          * command we see here has no sas_task and is thus unknown to the HA.
646          */
647         if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
648                 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
649                         scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
650
651 out:
652         /* now link into libata eh --- if we have any ata devices */
653         sas_ata_strategy_handler(shost);
654
655         scsi_eh_flush_done_q(&ha->eh_done_q);
656
657         SAS_DPRINTK("--- Exit %s\n", __func__);
658         return;
659 }
660
661 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
662 {
663         struct sas_task *task = TO_SAS_TASK(cmd);
664         unsigned long flags;
665         enum blk_eh_timer_return rtn;
666
667         if (sas_ata_timed_out(cmd, task, &rtn))
668                 return rtn;
669
670         if (!task) {
671                 cmd->request->timeout /= 2;
672                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
673                             cmd, task, (cmd->request->timeout ?
674                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
675                 if (!cmd->request->timeout)
676                         return BLK_EH_NOT_HANDLED;
677                 return BLK_EH_RESET_TIMER;
678         }
679
680         spin_lock_irqsave(&task->task_state_lock, flags);
681         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
682         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
683                 spin_unlock_irqrestore(&task->task_state_lock, flags);
684                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
685                             "BLK_EH_HANDLED\n", cmd, task);
686                 return BLK_EH_HANDLED;
687         }
688         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
689                 spin_unlock_irqrestore(&task->task_state_lock, flags);
690                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
691                             "BLK_EH_RESET_TIMER\n",
692                             cmd, task);
693                 return BLK_EH_RESET_TIMER;
694         }
695         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
696         spin_unlock_irqrestore(&task->task_state_lock, flags);
697
698         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
699                     cmd, task);
700
701         return BLK_EH_NOT_HANDLED;
702 }
703
704 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
705 {
706         struct domain_device *dev = sdev_to_domain_dev(sdev);
707
708         if (dev_is_sata(dev))
709                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
710
711         return -EINVAL;
712 }
713
714 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
715 {
716         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
717         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
718         struct domain_device *found_dev = NULL;
719         int i;
720         unsigned long flags;
721
722         spin_lock_irqsave(&ha->phy_port_lock, flags);
723         for (i = 0; i < ha->num_phys; i++) {
724                 struct asd_sas_port *port = ha->sas_port[i];
725                 struct domain_device *dev;
726
727                 spin_lock(&port->dev_list_lock);
728                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
729                         if (rphy == dev->rphy) {
730                                 found_dev = dev;
731                                 spin_unlock(&port->dev_list_lock);
732                                 goto found;
733                         }
734                 }
735                 spin_unlock(&port->dev_list_lock);
736         }
737  found:
738         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
739
740         return found_dev;
741 }
742
743 int sas_target_alloc(struct scsi_target *starget)
744 {
745         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
746         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
747         int res;
748
749         if (!found_dev)
750                 return -ENODEV;
751
752         if (dev_is_sata(found_dev)) {
753                 res = sas_ata_init_host_and_port(found_dev, starget);
754                 if (res)
755                         return res;
756         }
757
758         kref_get(&found_dev->kref);
759         starget->hostdata = found_dev;
760         return 0;
761 }
762
763 #define SAS_DEF_QD 256
764
765 int sas_slave_configure(struct scsi_device *scsi_dev)
766 {
767         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
768         struct sas_ha_struct *sas_ha;
769
770         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
771
772         if (dev_is_sata(dev)) {
773                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
774                 return 0;
775         }
776
777         sas_ha = dev->port->ha;
778
779         sas_read_port_mode_page(scsi_dev);
780
781         if (scsi_dev->tagged_supported) {
782                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
783                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
784         } else {
785                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
786                             "TCQ\n", SAS_ADDR(dev->sas_addr),
787                             scsi_dev->lun);
788                 scsi_dev->tagged_supported = 0;
789                 scsi_set_tag_type(scsi_dev, 0);
790                 scsi_deactivate_tcq(scsi_dev, 1);
791         }
792
793         scsi_dev->allow_restart = 1;
794
795         return 0;
796 }
797
798 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
799 {
800         struct domain_device *dev = sdev_to_domain_dev(sdev);
801
802         if (dev_is_sata(dev))
803                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
804                                                 reason);
805
806         switch (reason) {
807         case SCSI_QDEPTH_DEFAULT:
808         case SCSI_QDEPTH_RAMP_UP:
809                 if (!sdev->tagged_supported)
810                         depth = 1;
811                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
812                 break;
813         case SCSI_QDEPTH_QFULL:
814                 scsi_track_queue_full(sdev, depth);
815                 break;
816         default:
817                 return -EOPNOTSUPP;
818         }
819
820         return depth;
821 }
822
823 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
824 {
825         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
826
827         if (dev_is_sata(dev))
828                 return -EINVAL;
829
830         if (!scsi_dev->tagged_supported)
831                 return 0;
832
833         scsi_deactivate_tcq(scsi_dev, 1);
834
835         scsi_set_tag_type(scsi_dev, qt);
836         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
837
838         return qt;
839 }
840
841 int sas_bios_param(struct scsi_device *scsi_dev,
842                           struct block_device *bdev,
843                           sector_t capacity, int *hsc)
844 {
845         hsc[0] = 255;
846         hsc[1] = 63;
847         sector_div(capacity, 255*63);
848         hsc[2] = capacity;
849
850         return 0;
851 }
852
853 /* ---------- Task Collector Thread implementation ---------- */
854
855 static void sas_queue(struct sas_ha_struct *sas_ha)
856 {
857         struct scsi_core *core = &sas_ha->core;
858         unsigned long flags;
859         LIST_HEAD(q);
860         int can_queue;
861         int res;
862         struct sas_internal *i = to_sas_internal(core->shost->transportt);
863
864         spin_lock_irqsave(&core->task_queue_lock, flags);
865         while (!kthread_should_stop() &&
866                !list_empty(&core->task_queue)) {
867
868                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
869                 if (can_queue >= 0) {
870                         can_queue = core->task_queue_size;
871                         list_splice_init(&core->task_queue, &q);
872                 } else {
873                         struct list_head *a, *n;
874
875                         can_queue = sas_ha->lldd_queue_size;
876                         list_for_each_safe(a, n, &core->task_queue) {
877                                 list_move_tail(a, &q);
878                                 if (--can_queue == 0)
879                                         break;
880                         }
881                         can_queue = sas_ha->lldd_queue_size;
882                 }
883                 core->task_queue_size -= can_queue;
884                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
885                 {
886                         struct sas_task *task = list_entry(q.next,
887                                                            struct sas_task,
888                                                            list);
889                         list_del_init(&q);
890                         res = i->dft->lldd_execute_task(task, can_queue,
891                                                         GFP_KERNEL);
892                         if (unlikely(res))
893                                 __list_add(&q, task->list.prev, &task->list);
894                 }
895                 spin_lock_irqsave(&core->task_queue_lock, flags);
896                 if (res) {
897                         list_splice_init(&q, &core->task_queue); /*at head*/
898                         core->task_queue_size += can_queue;
899                 }
900         }
901         spin_unlock_irqrestore(&core->task_queue_lock, flags);
902 }
903
904 /**
905  * sas_queue_thread -- The Task Collector thread
906  * @_sas_ha: pointer to struct sas_ha
907  */
908 static int sas_queue_thread(void *_sas_ha)
909 {
910         struct sas_ha_struct *sas_ha = _sas_ha;
911
912         while (1) {
913                 set_current_state(TASK_INTERRUPTIBLE);
914                 schedule();
915                 sas_queue(sas_ha);
916                 if (kthread_should_stop())
917                         break;
918         }
919
920         return 0;
921 }
922
923 int sas_init_queue(struct sas_ha_struct *sas_ha)
924 {
925         struct scsi_core *core = &sas_ha->core;
926
927         spin_lock_init(&core->task_queue_lock);
928         core->task_queue_size = 0;
929         INIT_LIST_HEAD(&core->task_queue);
930
931         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
932                                          "sas_queue_%d", core->shost->host_no);
933         if (IS_ERR(core->queue_thread))
934                 return PTR_ERR(core->queue_thread);
935         return 0;
936 }
937
938 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
939 {
940         unsigned long flags;
941         struct scsi_core *core = &sas_ha->core;
942         struct sas_task *task, *n;
943
944         kthread_stop(core->queue_thread);
945
946         if (!list_empty(&core->task_queue))
947                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
948                             SAS_ADDR(sas_ha->sas_addr));
949
950         spin_lock_irqsave(&core->task_queue_lock, flags);
951         list_for_each_entry_safe(task, n, &core->task_queue, list) {
952                 struct scsi_cmnd *cmd = task->uldd_task;
953
954                 list_del_init(&task->list);
955
956                 ASSIGN_SAS_TASK(cmd, NULL);
957                 sas_free_task(task);
958                 cmd->result = DID_ABORT << 16;
959                 cmd->scsi_done(cmd);
960         }
961         spin_unlock_irqrestore(&core->task_queue_lock, flags);
962 }
963
964 /*
965  * Tell an upper layer that it needs to initiate an abort for a given task.
966  * This should only ever be called by an LLDD.
967  */
968 void sas_task_abort(struct sas_task *task)
969 {
970         struct scsi_cmnd *sc = task->uldd_task;
971
972         /* Escape for libsas internal commands */
973         if (!sc) {
974                 if (!del_timer(&task->timer))
975                         return;
976                 task->timer.function(task->timer.data);
977                 return;
978         }
979
980         if (dev_is_sata(task->dev)) {
981                 sas_ata_task_abort(task);
982         } else {
983                 struct request_queue *q = sc->device->request_queue;
984                 unsigned long flags;
985
986                 spin_lock_irqsave(q->queue_lock, flags);
987                 blk_abort_request(sc->request);
988                 spin_unlock_irqrestore(q->queue_lock, flags);
989                 scsi_schedule_eh(sc->device->host);
990         }
991 }
992
993 int sas_slave_alloc(struct scsi_device *scsi_dev)
994 {
995         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
996
997         if (dev_is_sata(dev))
998                 return ata_sas_port_init(dev->sata_dev.ap);
999
1000         return 0;
1001 }
1002
1003 void sas_target_destroy(struct scsi_target *starget)
1004 {
1005         struct domain_device *found_dev = starget->hostdata;
1006
1007         if (!found_dev)
1008                 return;
1009
1010         if (dev_is_sata(found_dev))
1011                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1012
1013         starget->hostdata = NULL;
1014         sas_put_device(found_dev);
1015 }
1016
1017 static void sas_parse_addr(u8 *sas_addr, const char *p)
1018 {
1019         int i;
1020         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1021                 u8 h, l;
1022                 if (!*p)
1023                         break;
1024                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1025                 p++;
1026                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1027                 p++;
1028                 sas_addr[i] = (h<<4) | l;
1029         }
1030 }
1031
1032 #define SAS_STRING_ADDR_SIZE    16
1033
1034 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1035 {
1036         int res;
1037         const struct firmware *fw;
1038
1039         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1040         if (res)
1041                 return res;
1042
1043         if (fw->size < SAS_STRING_ADDR_SIZE) {
1044                 res = -ENODEV;
1045                 goto out;
1046         }
1047
1048         sas_parse_addr(addr, fw->data);
1049
1050 out:
1051         release_firmware(fw);
1052         return res;
1053 }
1054 EXPORT_SYMBOL_GPL(sas_request_addr);
1055
1056 EXPORT_SYMBOL_GPL(sas_queuecommand);
1057 EXPORT_SYMBOL_GPL(sas_target_alloc);
1058 EXPORT_SYMBOL_GPL(sas_slave_configure);
1059 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1060 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1061 EXPORT_SYMBOL_GPL(sas_bios_param);
1062 EXPORT_SYMBOL_GPL(sas_task_abort);
1063 EXPORT_SYMBOL_GPL(sas_phy_reset);
1064 EXPORT_SYMBOL_GPL(sas_phy_enable);
1065 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1066 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1067 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1068 EXPORT_SYMBOL_GPL(sas_target_destroy);
1069 EXPORT_SYMBOL_GPL(sas_ioctl);