[SCSI] sas_scsi_host: Convert to use the kthread API
[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
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_internal.h"
38 #include "../scsi_transport_api.h"
39 #include "../scsi_priv.h"
40
41 #include <linux/err.h>
42 #include <linux/blkdev.h>
43 #include <linux/scatterlist.h>
44
45 /* ---------- SCSI Host glue ---------- */
46
47 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
48 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
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         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
55         unsigned ts_flags = task->task_state_flags;
56         int hs = 0, stat = 0;
57
58         if (unlikely(!sc)) {
59                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
60                 list_del_init(&task->list);
61                 sas_free_task(task);
62                 return;
63         }
64
65         if (ts->resp == SAS_TASK_UNDELIVERED) {
66                 /* transport error */
67                 hs = DID_NO_CONNECT;
68         } else { /* ts->resp == SAS_TASK_COMPLETE */
69                 /* task delivered, what happened afterwards? */
70                 switch (ts->stat) {
71                 case SAS_DEV_NO_RESPONSE:
72                 case SAS_INTERRUPTED:
73                 case SAS_PHY_DOWN:
74                 case SAS_NAK_R_ERR:
75                 case SAS_OPEN_TO:
76                         hs = DID_NO_CONNECT;
77                         break;
78                 case SAS_DATA_UNDERRUN:
79                         sc->resid = ts->residual;
80                         if (sc->request_bufflen - sc->resid < sc->underflow)
81                                 hs = DID_ERROR;
82                         break;
83                 case SAS_DATA_OVERRUN:
84                         hs = DID_ERROR;
85                         break;
86                 case SAS_QUEUE_FULL:
87                         hs = DID_SOFT_ERROR; /* retry */
88                         break;
89                 case SAS_DEVICE_UNKNOWN:
90                         hs = DID_BAD_TARGET;
91                         break;
92                 case SAS_SG_ERR:
93                         hs = DID_PARITY;
94                         break;
95                 case SAS_OPEN_REJECT:
96                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
97                                 hs = DID_SOFT_ERROR; /* retry */
98                         else
99                                 hs = DID_ERROR;
100                         break;
101                 case SAS_PROTO_RESPONSE:
102                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
103                                     "task; please report this\n",
104                                     task->dev->port->ha->sas_ha_name);
105                         break;
106                 case SAS_ABORTED_TASK:
107                         hs = DID_ABORT;
108                         break;
109                 case SAM_CHECK_COND:
110                         memcpy(sc->sense_buffer, ts->buf,
111                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
112                         stat = SAM_CHECK_COND;
113                         break;
114                 default:
115                         stat = ts->stat;
116                         break;
117                 }
118         }
119         ASSIGN_SAS_TASK(sc, NULL);
120         sc->result = (hs << 16) | stat;
121         list_del_init(&task->list);
122         sas_free_task(task);
123         /* This is very ugly but this is how SCSI Core works. */
124         if (ts_flags & SAS_TASK_STATE_ABORTED)
125                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
126         else
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         *(u32 *)cmd->sense_buffer = 0;
152         task->uldd_task = cmd;
153         ASSIGN_SAS_TASK(cmd, task);
154
155         task->dev = dev;
156         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
157
158         task->ssp_task.retry_count = 1;
159         int_to_scsilun(cmd->device->lun, &lun);
160         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
161         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
162         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
163
164         task->scatter = cmd->request_buffer;
165         task->num_scatter = cmd->use_sg;
166         task->total_xfer_len = cmd->request_bufflen;
167         task->data_dir = cmd->sc_data_direction;
168
169         task->task_done = sas_scsi_task_done;
170
171         return task;
172 }
173
174 static int sas_queue_up(struct sas_task *task)
175 {
176         struct sas_ha_struct *sas_ha = task->dev->port->ha;
177         struct scsi_core *core = &sas_ha->core;
178         unsigned long flags;
179         LIST_HEAD(list);
180
181         spin_lock_irqsave(&core->task_queue_lock, flags);
182         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
183                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
184                 return -SAS_QUEUE_FULL;
185         }
186         list_add_tail(&task->list, &core->task_queue);
187         core->task_queue_size += 1;
188         spin_unlock_irqrestore(&core->task_queue_lock, flags);
189         wake_up_process(core->queue_thread);
190
191         return 0;
192 }
193
194 /**
195  * sas_queuecommand -- Enqueue a command for processing
196  * @parameters: See SCSI Core documentation
197  *
198  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
199  * call us without holding an IRQ spinlock...
200  */
201 int sas_queuecommand(struct scsi_cmnd *cmd,
202                      void (*scsi_done)(struct scsi_cmnd *))
203 {
204         int res = 0;
205         struct domain_device *dev = cmd_to_domain_dev(cmd);
206         struct Scsi_Host *host = cmd->device->host;
207         struct sas_internal *i = to_sas_internal(host->transportt);
208
209         spin_unlock_irq(host->host_lock);
210
211         {
212                 struct sas_ha_struct *sas_ha = dev->port->ha;
213                 struct sas_task *task;
214
215                 res = -ENOMEM;
216                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
217                 if (!task)
218                         goto out;
219
220                 cmd->scsi_done = scsi_done;
221                 /* Queue up, Direct Mode or Task Collector Mode. */
222                 if (sas_ha->lldd_max_execute_num < 2)
223                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
224                 else
225                         res = sas_queue_up(task);
226
227                 /* Examine */
228                 if (res) {
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                                 res = 0;
235                                 scsi_done(cmd);
236                         }
237                         goto out;
238                 }
239         }
240 out:
241         spin_lock_irq(host->host_lock);
242         return res;
243 }
244
245 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
246 {
247         struct scsi_cmnd *cmd, *n;
248
249         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
250                 if (cmd == my_cmd)
251                         list_del_init(&cmd->eh_entry);
252         }
253 }
254
255 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
256                                      struct domain_device *dev)
257 {
258         struct scsi_cmnd *cmd, *n;
259
260         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
261                 struct domain_device *x = cmd_to_domain_dev(cmd);
262
263                 if (x == dev)
264                         list_del_init(&cmd->eh_entry);
265         }
266 }
267
268 static void sas_scsi_clear_queue_port(struct list_head *error_q,
269                                       struct asd_sas_port *port)
270 {
271         struct scsi_cmnd *cmd, *n;
272
273         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
274                 struct domain_device *dev = cmd_to_domain_dev(cmd);
275                 struct asd_sas_port *x = dev->port;
276
277                 if (x == port)
278                         list_del_init(&cmd->eh_entry);
279         }
280 }
281
282 enum task_disposition {
283         TASK_IS_DONE,
284         TASK_IS_ABORTED,
285         TASK_IS_AT_LU,
286         TASK_IS_NOT_AT_LU,
287         TASK_ABORT_FAILED,
288 };
289
290 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
291 {
292         struct sas_ha_struct *ha = task->dev->port->ha;
293         unsigned long flags;
294         int i, res;
295         struct sas_internal *si =
296                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
297
298         if (ha->lldd_max_execute_num > 1) {
299                 struct scsi_core *core = &ha->core;
300                 struct sas_task *t, *n;
301
302                 spin_lock_irqsave(&core->task_queue_lock, flags);
303                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
304                         if (task == t) {
305                                 list_del_init(&t->list);
306                                 spin_unlock_irqrestore(&core->task_queue_lock,
307                                                        flags);
308                                 SAS_DPRINTK("%s: task 0x%p aborted from "
309                                             "task_queue\n",
310                                             __FUNCTION__, task);
311                                 return TASK_IS_ABORTED;
312                         }
313                 }
314                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
315         }
316
317         for (i = 0; i < 5; i++) {
318                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
319                 res = si->dft->lldd_abort_task(task);
320
321                 spin_lock_irqsave(&task->task_state_lock, flags);
322                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
323                         spin_unlock_irqrestore(&task->task_state_lock, flags);
324                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
325                                     task);
326                         return TASK_IS_DONE;
327                 }
328                 spin_unlock_irqrestore(&task->task_state_lock, flags);
329
330                 if (res == TMF_RESP_FUNC_COMPLETE) {
331                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
332                                     __FUNCTION__, task);
333                         return TASK_IS_ABORTED;
334                 } else if (si->dft->lldd_query_task) {
335                         SAS_DPRINTK("%s: querying task 0x%p\n",
336                                     __FUNCTION__, task);
337                         res = si->dft->lldd_query_task(task);
338                         switch (res) {
339                         case TMF_RESP_FUNC_SUCC:
340                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
341                                             __FUNCTION__, task);
342                                 return TASK_IS_AT_LU;
343                         case TMF_RESP_FUNC_COMPLETE:
344                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
345                                             __FUNCTION__, task);
346                                 return TASK_IS_NOT_AT_LU;
347                         case TMF_RESP_FUNC_FAILED:
348                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
349                                                 __FUNCTION__, task);
350                                 return TASK_ABORT_FAILED;
351                         }
352
353                 }
354         }
355         return res;
356 }
357
358 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
359 {
360         int res = TMF_RESP_FUNC_FAILED;
361         struct scsi_lun lun;
362         struct sas_internal *i =
363                 to_sas_internal(dev->port->ha->core.shost->transportt);
364
365         int_to_scsilun(cmd->device->lun, &lun);
366
367         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
368                     SAS_ADDR(dev->sas_addr),
369                     cmd->device->lun);
370
371         if (i->dft->lldd_abort_task_set)
372                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
373
374         if (res == TMF_RESP_FUNC_FAILED) {
375                 if (i->dft->lldd_clear_task_set)
376                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
377         }
378
379         if (res == TMF_RESP_FUNC_FAILED) {
380                 if (i->dft->lldd_lu_reset)
381                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
382         }
383
384         return res;
385 }
386
387 static int sas_recover_I_T(struct domain_device *dev)
388 {
389         int res = TMF_RESP_FUNC_FAILED;
390         struct sas_internal *i =
391                 to_sas_internal(dev->port->ha->core.shost->transportt);
392
393         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
394                     SAS_ADDR(dev->sas_addr));
395
396         if (i->dft->lldd_I_T_nexus_reset)
397                 res = i->dft->lldd_I_T_nexus_reset(dev);
398
399         return res;
400 }
401
402 /* Find the sas_phy that's attached to this device */
403 struct sas_phy *find_local_sas_phy(struct domain_device *dev)
404 {
405         struct domain_device *pdev = dev->parent;
406         struct ex_phy *exphy = NULL;
407         int i;
408
409         /* Directly attached device */
410         if (!pdev)
411                 return dev->port->phy;
412
413         /* Otherwise look in the expander */
414         for (i = 0; i < pdev->ex_dev.num_phys; i++)
415                 if (!memcmp(dev->sas_addr,
416                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
417                             SAS_ADDR_SIZE)) {
418                         exphy = &pdev->ex_dev.ex_phy[i];
419                         break;
420                 }
421
422         BUG_ON(!exphy);
423         return exphy->phy;
424 }
425
426 /* Attempt to send a LUN reset message to a device */
427 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
428 {
429         struct domain_device *dev = cmd_to_domain_dev(cmd);
430         struct sas_internal *i =
431                 to_sas_internal(dev->port->ha->core.shost->transportt);
432         struct scsi_lun lun;
433         int res;
434
435         int_to_scsilun(cmd->device->lun, &lun);
436
437         if (!i->dft->lldd_lu_reset)
438                 return FAILED;
439
440         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
441         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
442                 return SUCCESS;
443
444         return FAILED;
445 }
446
447 /* Attempt to send a phy (bus) reset */
448 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
449 {
450         struct domain_device *dev = cmd_to_domain_dev(cmd);
451         struct sas_phy *phy = find_local_sas_phy(dev);
452         int res;
453
454         res = sas_phy_reset(phy, 1);
455         if (res)
456                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
457                             phy->dev.kobj.k_name,
458                             res);
459         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
460                 return SUCCESS;
461
462         return FAILED;
463 }
464
465 /* Try to reset a device */
466 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
467                                    struct scsi_cmnd *cmd)
468 {
469         int res;
470
471         if (!shost->hostt->eh_device_reset_handler)
472                 goto try_bus_reset;
473
474         res = shost->hostt->eh_device_reset_handler(cmd);
475         if (res == SUCCESS)
476                 return res;
477
478 try_bus_reset:
479         if (shost->hostt->eh_bus_reset_handler)
480                 return shost->hostt->eh_bus_reset_handler(cmd);
481
482         return FAILED;
483 }
484
485 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
486                                     struct list_head *work_q,
487                                     struct list_head *done_q)
488 {
489         struct scsi_cmnd *cmd, *n;
490         enum task_disposition res = TASK_IS_DONE;
491         int tmf_resp, need_reset;
492         struct sas_internal *i = to_sas_internal(shost->transportt);
493         unsigned long flags;
494         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
495
496 Again:
497         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
498                 struct sas_task *task = TO_SAS_TASK(cmd);
499
500                 if (!task)
501                         continue;
502
503                 list_del_init(&cmd->eh_entry);
504
505                 spin_lock_irqsave(&task->task_state_lock, flags);
506                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
507                 spin_unlock_irqrestore(&task->task_state_lock, flags);
508
509                 SAS_DPRINTK("trying to find task 0x%p\n", task);
510                 res = sas_scsi_find_task(task);
511
512                 cmd->eh_eflags = 0;
513
514                 switch (res) {
515                 case TASK_IS_DONE:
516                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
517                                     task);
518                         task->task_done(task);
519                         if (need_reset)
520                                 try_to_reset_cmd_device(shost, cmd);
521                         continue;
522                 case TASK_IS_ABORTED:
523                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
524                                     __FUNCTION__, task);
525                         task->task_done(task);
526                         if (need_reset)
527                                 try_to_reset_cmd_device(shost, cmd);
528                         continue;
529                 case TASK_IS_AT_LU:
530                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
531                         tmf_resp = sas_recover_lu(task->dev, cmd);
532                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
533                                 SAS_DPRINTK("dev %016llx LU %x is "
534                                             "recovered\n",
535                                             SAS_ADDR(task->dev),
536                                             cmd->device->lun);
537                                 task->task_done(task);
538                                 if (need_reset)
539                                         try_to_reset_cmd_device(shost, cmd);
540                                 sas_scsi_clear_queue_lu(work_q, cmd);
541                                 goto Again;
542                         }
543                         /* fallthrough */
544                 case TASK_IS_NOT_AT_LU:
545                 case TASK_ABORT_FAILED:
546                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
547                                     task);
548                         tmf_resp = sas_recover_I_T(task->dev);
549                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
550                                 SAS_DPRINTK("I_T %016llx recovered\n",
551                                             SAS_ADDR(task->dev->sas_addr));
552                                 task->task_done(task);
553                                 if (need_reset)
554                                         try_to_reset_cmd_device(shost, cmd);
555                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
556                                 goto Again;
557                         }
558                         /* Hammer time :-) */
559                         if (i->dft->lldd_clear_nexus_port) {
560                                 struct asd_sas_port *port = task->dev->port;
561                                 SAS_DPRINTK("clearing nexus for port:%d\n",
562                                             port->id);
563                                 res = i->dft->lldd_clear_nexus_port(port);
564                                 if (res == TMF_RESP_FUNC_COMPLETE) {
565                                         SAS_DPRINTK("clear nexus port:%d "
566                                                     "succeeded\n", port->id);
567                                         task->task_done(task);
568                                         if (need_reset)
569                                                 try_to_reset_cmd_device(shost, cmd);
570                                         sas_scsi_clear_queue_port(work_q,
571                                                                   port);
572                                         goto Again;
573                                 }
574                         }
575                         if (i->dft->lldd_clear_nexus_ha) {
576                                 SAS_DPRINTK("clear nexus ha\n");
577                                 res = i->dft->lldd_clear_nexus_ha(ha);
578                                 if (res == TMF_RESP_FUNC_COMPLETE) {
579                                         SAS_DPRINTK("clear nexus ha "
580                                                     "succeeded\n");
581                                         task->task_done(task);
582                                         if (need_reset)
583                                                 try_to_reset_cmd_device(shost, cmd);
584                                         goto out;
585                                 }
586                         }
587                         /* If we are here -- this means that no amount
588                          * of effort could recover from errors.  Quite
589                          * possibly the HA just disappeared.
590                          */
591                         SAS_DPRINTK("error from  device %llx, LUN %x "
592                                     "couldn't be recovered in any way\n",
593                                     SAS_ADDR(task->dev->sas_addr),
594                                     cmd->device->lun);
595
596                         task->task_done(task);
597                         if (need_reset)
598                                 try_to_reset_cmd_device(shost, cmd);
599                         goto clear_q;
600                 }
601         }
602 out:
603         return list_empty(work_q);
604 clear_q:
605         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
606         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
607                 struct sas_task *task = TO_SAS_TASK(cmd);
608                 list_del_init(&cmd->eh_entry);
609                 task->task_done(task);
610         }
611         return list_empty(work_q);
612 }
613
614 void sas_scsi_recover_host(struct Scsi_Host *shost)
615 {
616         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
617         unsigned long flags;
618         LIST_HEAD(eh_work_q);
619
620         spin_lock_irqsave(shost->host_lock, flags);
621         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
622         spin_unlock_irqrestore(shost->host_lock, flags);
623
624         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
625         /*
626          * Deal with commands that still have SAS tasks (i.e. they didn't
627          * complete via the normal sas_task completion mechanism)
628          */
629         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
630                 goto out;
631
632         /*
633          * Now deal with SCSI commands that completed ok but have a an error
634          * code (and hopefully sense data) attached.  This is roughly what
635          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
636          * command we see here has no sas_task and is thus unknown to the HA.
637          */
638         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
639                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
640
641 out:
642         scsi_eh_flush_done_q(&ha->eh_done_q);
643         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
644         return;
645 }
646
647 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
648 {
649         struct sas_task *task = TO_SAS_TASK(cmd);
650         unsigned long flags;
651
652         if (!task) {
653                 cmd->timeout_per_command /= 2;
654                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
655                             cmd, task, (cmd->timeout_per_command ?
656                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
657                 if (!cmd->timeout_per_command)
658                         return EH_NOT_HANDLED;
659                 return EH_RESET_TIMER;
660         }
661
662         spin_lock_irqsave(&task->task_state_lock, flags);
663         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
664         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
665                 spin_unlock_irqrestore(&task->task_state_lock, flags);
666                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
667                             cmd, task);
668                 return EH_HANDLED;
669         }
670         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
671                 spin_unlock_irqrestore(&task->task_state_lock, flags);
672                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
673                             "EH_RESET_TIMER\n",
674                             cmd, task);
675                 return EH_RESET_TIMER;
676         }
677         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
678         spin_unlock_irqrestore(&task->task_state_lock, flags);
679
680         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
681                     cmd, task);
682
683         return EH_NOT_HANDLED;
684 }
685
686 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
687 {
688         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
689         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
690         struct domain_device *found_dev = NULL;
691         int i;
692         unsigned long flags;
693
694         spin_lock_irqsave(&ha->phy_port_lock, flags);
695         for (i = 0; i < ha->num_phys; i++) {
696                 struct asd_sas_port *port = ha->sas_port[i];
697                 struct domain_device *dev;
698
699                 spin_lock(&port->dev_list_lock);
700                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
701                         if (rphy == dev->rphy) {
702                                 found_dev = dev;
703                                 spin_unlock(&port->dev_list_lock);
704                                 goto found;
705                         }
706                 }
707                 spin_unlock(&port->dev_list_lock);
708         }
709  found:
710         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
711
712         return found_dev;
713 }
714
715 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
716 {
717         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
718
719         return sas_find_dev_by_rphy(rphy);
720 }
721
722 int sas_target_alloc(struct scsi_target *starget)
723 {
724         struct domain_device *found_dev = sas_find_target(starget);
725
726         if (!found_dev)
727                 return -ENODEV;
728
729         starget->hostdata = found_dev;
730         return 0;
731 }
732
733 #define SAS_DEF_QD 32
734 #define SAS_MAX_QD 64
735
736 int sas_slave_configure(struct scsi_device *scsi_dev)
737 {
738         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
739         struct sas_ha_struct *sas_ha;
740
741         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
742
743         sas_ha = dev->port->ha;
744
745         sas_read_port_mode_page(scsi_dev);
746
747         if (scsi_dev->tagged_supported) {
748                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
749                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
750         } else {
751                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
752                             "TCQ\n", SAS_ADDR(dev->sas_addr),
753                             scsi_dev->lun);
754                 scsi_dev->tagged_supported = 0;
755                 scsi_set_tag_type(scsi_dev, 0);
756                 scsi_deactivate_tcq(scsi_dev, 1);
757         }
758
759         scsi_dev->allow_restart = 1;
760
761         return 0;
762 }
763
764 void sas_slave_destroy(struct scsi_device *scsi_dev)
765 {
766 }
767
768 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
769 {
770         int res = min(new_depth, SAS_MAX_QD);
771
772         if (scsi_dev->tagged_supported)
773                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
774                                         res);
775         else {
776                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
777                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
778                            SAS_ADDR(dev->sas_addr),
779                            scsi_dev->lun);
780                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
781                 res = 1;
782         }
783
784         return res;
785 }
786
787 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
788 {
789         if (!scsi_dev->tagged_supported)
790                 return 0;
791
792         scsi_deactivate_tcq(scsi_dev, 1);
793
794         scsi_set_tag_type(scsi_dev, qt);
795         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
796
797         return qt;
798 }
799
800 int sas_bios_param(struct scsi_device *scsi_dev,
801                           struct block_device *bdev,
802                           sector_t capacity, int *hsc)
803 {
804         hsc[0] = 255;
805         hsc[1] = 63;
806         sector_div(capacity, 255*63);
807         hsc[2] = capacity;
808
809         return 0;
810 }
811
812 /* ---------- Task Collector Thread implementation ---------- */
813
814 static void sas_queue(struct sas_ha_struct *sas_ha)
815 {
816         struct scsi_core *core = &sas_ha->core;
817         unsigned long flags;
818         LIST_HEAD(q);
819         int can_queue;
820         int res;
821         struct sas_internal *i = to_sas_internal(core->shost->transportt);
822
823         spin_lock_irqsave(&core->task_queue_lock, flags);
824         while (!kthread_should_stop() &&
825                !list_empty(&core->task_queue)) {
826
827                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
828                 if (can_queue >= 0) {
829                         can_queue = core->task_queue_size;
830                         list_splice_init(&core->task_queue, &q);
831                 } else {
832                         struct list_head *a, *n;
833
834                         can_queue = sas_ha->lldd_queue_size;
835                         list_for_each_safe(a, n, &core->task_queue) {
836                                 list_move_tail(a, &q);
837                                 if (--can_queue == 0)
838                                         break;
839                         }
840                         can_queue = sas_ha->lldd_queue_size;
841                 }
842                 core->task_queue_size -= can_queue;
843                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
844                 {
845                         struct sas_task *task = list_entry(q.next,
846                                                            struct sas_task,
847                                                            list);
848                         list_del_init(&q);
849                         res = i->dft->lldd_execute_task(task, can_queue,
850                                                         GFP_KERNEL);
851                         if (unlikely(res))
852                                 __list_add(&q, task->list.prev, &task->list);
853                 }
854                 spin_lock_irqsave(&core->task_queue_lock, flags);
855                 if (res) {
856                         list_splice_init(&q, &core->task_queue); /*at head*/
857                         core->task_queue_size += can_queue;
858                 }
859         }
860         spin_unlock_irqrestore(&core->task_queue_lock, flags);
861 }
862
863 /**
864  * sas_queue_thread -- The Task Collector thread
865  * @_sas_ha: pointer to struct sas_ha
866  */
867 static int sas_queue_thread(void *_sas_ha)
868 {
869         struct sas_ha_struct *sas_ha = _sas_ha;
870
871         current->flags |= PF_NOFREEZE;
872
873         while (1) {
874                 set_current_state(TASK_INTERRUPTIBLE);
875                 schedule();
876                 sas_queue(sas_ha);
877                 if (kthread_should_stop())
878                         break;
879         }
880
881         return 0;
882 }
883
884 int sas_init_queue(struct sas_ha_struct *sas_ha)
885 {
886         struct scsi_core *core = &sas_ha->core;
887
888         spin_lock_init(&core->task_queue_lock);
889         core->task_queue_size = 0;
890         INIT_LIST_HEAD(&core->task_queue);
891
892         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
893                                          "sas_queue_%d", core->shost->host_no);
894         if (IS_ERR(core->queue_thread))
895                 return PTR_ERR(core->queue_thread);
896         return 0;
897 }
898
899 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
900 {
901         unsigned long flags;
902         struct scsi_core *core = &sas_ha->core;
903         struct sas_task *task, *n;
904
905         kthread_stop(core->queue_thread);
906
907         if (!list_empty(&core->task_queue))
908                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
909                             SAS_ADDR(sas_ha->sas_addr));
910
911         spin_lock_irqsave(&core->task_queue_lock, flags);
912         list_for_each_entry_safe(task, n, &core->task_queue, list) {
913                 struct scsi_cmnd *cmd = task->uldd_task;
914
915                 list_del_init(&task->list);
916
917                 ASSIGN_SAS_TASK(cmd, NULL);
918                 sas_free_task(task);
919                 cmd->result = DID_ABORT << 16;
920                 cmd->scsi_done(cmd);
921         }
922         spin_unlock_irqrestore(&core->task_queue_lock, flags);
923 }
924
925 /*
926  * Call the LLDD task abort routine directly.  This function is intended for
927  * use by upper layers that need to tell the LLDD to abort a task.
928  */
929 int __sas_task_abort(struct sas_task *task)
930 {
931         struct sas_internal *si =
932                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
933         unsigned long flags;
934         int res;
935
936         spin_lock_irqsave(&task->task_state_lock, flags);
937         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
938             task->task_state_flags & SAS_TASK_STATE_DONE) {
939                 spin_unlock_irqrestore(&task->task_state_lock, flags);
940                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
941                             task);
942                 return 0;
943         }
944         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
945         spin_unlock_irqrestore(&task->task_state_lock, flags);
946
947         if (!si->dft->lldd_abort_task)
948                 return -ENODEV;
949
950         res = si->dft->lldd_abort_task(task);
951
952         spin_lock_irqsave(&task->task_state_lock, flags);
953         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
954             (res == TMF_RESP_FUNC_COMPLETE))
955         {
956                 spin_unlock_irqrestore(&task->task_state_lock, flags);
957                 task->task_done(task);
958                 return 0;
959         }
960
961         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
962                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
963         spin_unlock_irqrestore(&task->task_state_lock, flags);
964
965         return -EAGAIN;
966 }
967
968 /*
969  * Tell an upper layer that it needs to initiate an abort for a given task.
970  * This should only ever be called by an LLDD.
971  */
972 void sas_task_abort(struct sas_task *task)
973 {
974         struct scsi_cmnd *sc = task->uldd_task;
975
976         /* Escape for libsas internal commands */
977         if (!sc) {
978                 if (!del_timer(&task->timer))
979                         return;
980                 task->timer.function(task->timer.data);
981                 return;
982         }
983
984         scsi_req_abort_cmd(sc);
985         scsi_schedule_eh(sc->device->host);
986 }
987
988 EXPORT_SYMBOL_GPL(sas_queuecommand);
989 EXPORT_SYMBOL_GPL(sas_target_alloc);
990 EXPORT_SYMBOL_GPL(sas_slave_configure);
991 EXPORT_SYMBOL_GPL(sas_slave_destroy);
992 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
993 EXPORT_SYMBOL_GPL(sas_change_queue_type);
994 EXPORT_SYMBOL_GPL(sas_bios_param);
995 EXPORT_SYMBOL_GPL(__sas_task_abort);
996 EXPORT_SYMBOL_GPL(sas_task_abort);
997 EXPORT_SYMBOL_GPL(sas_phy_reset);
998 EXPORT_SYMBOL_GPL(sas_phy_enable);
999 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1000 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);