[SCSI] isci: atapi support
[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/ctype.h>
29
30 #include "sas_internal.h"
31
32 #include <scsi/scsi_host.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_tcq.h>
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_eh.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_sas.h>
39 #include <scsi/sas_ata.h>
40 #include "../scsi_sas_internal.h"
41 #include "../scsi_transport_api.h"
42 #include "../scsi_priv.h"
43
44 #include <linux/err.h>
45 #include <linux/blkdev.h>
46 #include <linux/freezer.h>
47 #include <linux/gfp.h>
48 #include <linux/scatterlist.h>
49 #include <linux/libata.h>
50
51 /* ---------- SCSI Host glue ---------- */
52
53 static void sas_scsi_task_done(struct sas_task *task)
54 {
55         struct task_status_struct *ts = &task->task_status;
56         struct scsi_cmnd *sc = task->uldd_task;
57         int hs = 0, stat = 0;
58
59         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
60                 /* Aborted tasks will be completed by the error handler */
61                 SAS_DPRINTK("task done but aborted\n");
62                 return;
63         }
64
65         if (unlikely(!sc)) {
66                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
67                 list_del_init(&task->list);
68                 sas_free_task(task);
69                 return;
70         }
71
72         if (ts->resp == SAS_TASK_UNDELIVERED) {
73                 /* transport error */
74                 hs = DID_NO_CONNECT;
75         } else { /* ts->resp == SAS_TASK_COMPLETE */
76                 /* task delivered, what happened afterwards? */
77                 switch (ts->stat) {
78                 case SAS_DEV_NO_RESPONSE:
79                 case SAS_INTERRUPTED:
80                 case SAS_PHY_DOWN:
81                 case SAS_NAK_R_ERR:
82                 case SAS_OPEN_TO:
83                         hs = DID_NO_CONNECT;
84                         break;
85                 case SAS_DATA_UNDERRUN:
86                         scsi_set_resid(sc, ts->residual);
87                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
88                                 hs = DID_ERROR;
89                         break;
90                 case SAS_DATA_OVERRUN:
91                         hs = DID_ERROR;
92                         break;
93                 case SAS_QUEUE_FULL:
94                         hs = DID_SOFT_ERROR; /* retry */
95                         break;
96                 case SAS_DEVICE_UNKNOWN:
97                         hs = DID_BAD_TARGET;
98                         break;
99                 case SAS_SG_ERR:
100                         hs = DID_PARITY;
101                         break;
102                 case SAS_OPEN_REJECT:
103                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
104                                 hs = DID_SOFT_ERROR; /* retry */
105                         else
106                                 hs = DID_ERROR;
107                         break;
108                 case SAS_PROTO_RESPONSE:
109                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
110                                     "task; please report this\n",
111                                     task->dev->port->ha->sas_ha_name);
112                         break;
113                 case SAS_ABORTED_TASK:
114                         hs = DID_ABORT;
115                         break;
116                 case SAM_STAT_CHECK_CONDITION:
117                         memcpy(sc->sense_buffer, ts->buf,
118                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
119                         stat = SAM_STAT_CHECK_CONDITION;
120                         break;
121                 default:
122                         stat = ts->stat;
123                         break;
124                 }
125         }
126         ASSIGN_SAS_TASK(sc, NULL);
127         sc->result = (hs << 16) | stat;
128         list_del_init(&task->list);
129         sas_free_task(task);
130         sc->scsi_done(sc);
131 }
132
133 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
134                                                struct domain_device *dev,
135                                                gfp_t gfp_flags)
136 {
137         struct sas_task *task = sas_alloc_task(gfp_flags);
138         struct scsi_lun lun;
139
140         if (!task)
141                 return NULL;
142
143         task->uldd_task = cmd;
144         ASSIGN_SAS_TASK(cmd, task);
145
146         task->dev = dev;
147         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
148
149         task->ssp_task.retry_count = 1;
150         int_to_scsilun(cmd->device->lun, &lun);
151         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
152         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
153         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
154
155         task->scatter = scsi_sglist(cmd);
156         task->num_scatter = scsi_sg_count(cmd);
157         task->total_xfer_len = scsi_bufflen(cmd);
158         task->data_dir = cmd->sc_data_direction;
159
160         task->task_done = sas_scsi_task_done;
161
162         return task;
163 }
164
165 int sas_queue_up(struct sas_task *task)
166 {
167         struct sas_ha_struct *sas_ha = task->dev->port->ha;
168         struct scsi_core *core = &sas_ha->core;
169         unsigned long flags;
170         LIST_HEAD(list);
171
172         spin_lock_irqsave(&core->task_queue_lock, flags);
173         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
174                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
175                 return -SAS_QUEUE_FULL;
176         }
177         list_add_tail(&task->list, &core->task_queue);
178         core->task_queue_size += 1;
179         spin_unlock_irqrestore(&core->task_queue_lock, flags);
180         wake_up_process(core->queue_thread);
181
182         return 0;
183 }
184
185 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
186 {
187         struct sas_internal *i = to_sas_internal(host->transportt);
188         struct domain_device *dev = cmd_to_domain_dev(cmd);
189         struct sas_ha_struct *sas_ha = dev->port->ha;
190         struct sas_task *task;
191         int res = 0;
192
193         /* If the device fell off, no sense in issuing commands */
194         if (dev->gone) {
195                 cmd->result = DID_BAD_TARGET << 16;
196                 goto out_done;
197         }
198
199         if (dev_is_sata(dev)) {
200                 unsigned long flags;
201
202                 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
203                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
204                 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
205                 return res;
206         }
207
208         task = sas_create_task(cmd, dev, GFP_ATOMIC);
209         if (!task)
210                 return SCSI_MLQUEUE_HOST_BUSY;
211
212         /* Queue up, Direct Mode or Task Collector Mode. */
213         if (sas_ha->lldd_max_execute_num < 2)
214                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
215         else
216                 res = sas_queue_up(task);
217
218         if (res)
219                 goto out_free_task;
220         return 0;
221
222 out_free_task:
223         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
224         ASSIGN_SAS_TASK(cmd, NULL);
225         sas_free_task(task);
226         if (res == -SAS_QUEUE_FULL)
227                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
228         else
229                 cmd->result = DID_ERROR << 16;
230 out_done:
231         cmd->scsi_done(cmd);
232         return 0;
233 }
234
235 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
236 {
237         struct sas_task *task = TO_SAS_TASK(cmd);
238         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
239
240         /* remove the aborted task flag to allow the task to be
241          * completed now. At this point, we only get called following
242          * an actual abort of the task, so we should be guaranteed not
243          * to be racing with any completions from the LLD (hence we
244          * don't need the task state lock to clear the flag) */
245         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
246         /* Now call task_done.  However, task will be free'd after
247          * this */
248         task->task_done(task);
249         /* now finish the command and move it on to the error
250          * handler done list, this also takes it off the
251          * error handler pending list */
252         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
253 }
254
255 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
256 {
257         struct scsi_cmnd *cmd, *n;
258
259         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
260                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
261                     cmd->device->lun == my_cmd->device->lun)
262                         sas_eh_finish_cmd(cmd);
263         }
264 }
265
266 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
267                                      struct domain_device *dev)
268 {
269         struct scsi_cmnd *cmd, *n;
270
271         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
272                 struct domain_device *x = cmd_to_domain_dev(cmd);
273
274                 if (x == dev)
275                         sas_eh_finish_cmd(cmd);
276         }
277 }
278
279 static void sas_scsi_clear_queue_port(struct list_head *error_q,
280                                       struct asd_sas_port *port)
281 {
282         struct scsi_cmnd *cmd, *n;
283
284         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
285                 struct domain_device *dev = cmd_to_domain_dev(cmd);
286                 struct asd_sas_port *x = dev->port;
287
288                 if (x == port)
289                         sas_eh_finish_cmd(cmd);
290         }
291 }
292
293 enum task_disposition {
294         TASK_IS_DONE,
295         TASK_IS_ABORTED,
296         TASK_IS_AT_LU,
297         TASK_IS_NOT_AT_LU,
298         TASK_ABORT_FAILED,
299 };
300
301 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
302 {
303         struct sas_ha_struct *ha = task->dev->port->ha;
304         unsigned long flags;
305         int i, res;
306         struct sas_internal *si =
307                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
308
309         if (ha->lldd_max_execute_num > 1) {
310                 struct scsi_core *core = &ha->core;
311                 struct sas_task *t, *n;
312
313                 spin_lock_irqsave(&core->task_queue_lock, flags);
314                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
315                         if (task == t) {
316                                 list_del_init(&t->list);
317                                 spin_unlock_irqrestore(&core->task_queue_lock,
318                                                        flags);
319                                 SAS_DPRINTK("%s: task 0x%p aborted from "
320                                             "task_queue\n",
321                                             __func__, task);
322                                 return TASK_IS_ABORTED;
323                         }
324                 }
325                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
326         }
327
328         for (i = 0; i < 5; i++) {
329                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
330                 res = si->dft->lldd_abort_task(task);
331
332                 spin_lock_irqsave(&task->task_state_lock, flags);
333                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
334                         spin_unlock_irqrestore(&task->task_state_lock, flags);
335                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
336                                     task);
337                         return TASK_IS_DONE;
338                 }
339                 spin_unlock_irqrestore(&task->task_state_lock, flags);
340
341                 if (res == TMF_RESP_FUNC_COMPLETE) {
342                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
343                                     __func__, task);
344                         return TASK_IS_ABORTED;
345                 } else if (si->dft->lldd_query_task) {
346                         SAS_DPRINTK("%s: querying task 0x%p\n",
347                                     __func__, task);
348                         res = si->dft->lldd_query_task(task);
349                         switch (res) {
350                         case TMF_RESP_FUNC_SUCC:
351                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
352                                             __func__, task);
353                                 return TASK_IS_AT_LU;
354                         case TMF_RESP_FUNC_COMPLETE:
355                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
356                                             __func__, task);
357                                 return TASK_IS_NOT_AT_LU;
358                         case TMF_RESP_FUNC_FAILED:
359                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
360                                                 __func__, task);
361                                 return TASK_ABORT_FAILED;
362                         }
363
364                 }
365         }
366         return res;
367 }
368
369 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
370 {
371         int res = TMF_RESP_FUNC_FAILED;
372         struct scsi_lun lun;
373         struct sas_internal *i =
374                 to_sas_internal(dev->port->ha->core.shost->transportt);
375
376         int_to_scsilun(cmd->device->lun, &lun);
377
378         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
379                     SAS_ADDR(dev->sas_addr),
380                     cmd->device->lun);
381
382         if (i->dft->lldd_abort_task_set)
383                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
384
385         if (res == TMF_RESP_FUNC_FAILED) {
386                 if (i->dft->lldd_clear_task_set)
387                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
388         }
389
390         if (res == TMF_RESP_FUNC_FAILED) {
391                 if (i->dft->lldd_lu_reset)
392                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
393         }
394
395         return res;
396 }
397
398 static int sas_recover_I_T(struct domain_device *dev)
399 {
400         int res = TMF_RESP_FUNC_FAILED;
401         struct sas_internal *i =
402                 to_sas_internal(dev->port->ha->core.shost->transportt);
403
404         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
405                     SAS_ADDR(dev->sas_addr));
406
407         if (i->dft->lldd_I_T_nexus_reset)
408                 res = i->dft->lldd_I_T_nexus_reset(dev);
409
410         return res;
411 }
412
413 /* Find the sas_phy that's attached to this device */
414 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
415 {
416         struct domain_device *pdev = dev->parent;
417         struct ex_phy *exphy = NULL;
418         int i;
419
420         /* Directly attached device */
421         if (!pdev)
422                 return dev->port->phy;
423
424         /* Otherwise look in the expander */
425         for (i = 0; i < pdev->ex_dev.num_phys; i++)
426                 if (!memcmp(dev->sas_addr,
427                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
428                             SAS_ADDR_SIZE)) {
429                         exphy = &pdev->ex_dev.ex_phy[i];
430                         break;
431                 }
432
433         BUG_ON(!exphy);
434         return exphy->phy;
435 }
436 EXPORT_SYMBOL_GPL(sas_find_local_phy);
437
438 /* Attempt to send a LUN reset message to a device */
439 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
440 {
441         struct domain_device *dev = cmd_to_domain_dev(cmd);
442         struct sas_internal *i =
443                 to_sas_internal(dev->port->ha->core.shost->transportt);
444         struct scsi_lun lun;
445         int res;
446
447         int_to_scsilun(cmd->device->lun, &lun);
448
449         if (!i->dft->lldd_lu_reset)
450                 return FAILED;
451
452         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
453         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
454                 return SUCCESS;
455
456         return FAILED;
457 }
458
459 /* Attempt to send a phy (bus) reset */
460 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
461 {
462         struct domain_device *dev = cmd_to_domain_dev(cmd);
463         struct sas_phy *phy = sas_find_local_phy(dev);
464         int res;
465
466         res = sas_phy_reset(phy, 1);
467         if (res)
468                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
469                             kobject_name(&phy->dev.kobj),
470                             res);
471         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
472                 return SUCCESS;
473
474         return FAILED;
475 }
476
477 /* Try to reset a device */
478 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
479 {
480         int res;
481         struct Scsi_Host *shost = cmd->device->host;
482
483         if (!shost->hostt->eh_device_reset_handler)
484                 goto try_bus_reset;
485
486         res = shost->hostt->eh_device_reset_handler(cmd);
487         if (res == SUCCESS)
488                 return res;
489
490 try_bus_reset:
491         if (shost->hostt->eh_bus_reset_handler)
492                 return shost->hostt->eh_bus_reset_handler(cmd);
493
494         return FAILED;
495 }
496
497 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
498                                     struct list_head *work_q,
499                                     struct list_head *done_q)
500 {
501         struct scsi_cmnd *cmd, *n;
502         enum task_disposition res = TASK_IS_DONE;
503         int tmf_resp, need_reset;
504         struct sas_internal *i = to_sas_internal(shost->transportt);
505         unsigned long flags;
506         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
507
508 Again:
509         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
510                 struct sas_task *task = TO_SAS_TASK(cmd);
511
512                 if (!task)
513                         continue;
514
515                 list_del_init(&cmd->eh_entry);
516
517                 spin_lock_irqsave(&task->task_state_lock, flags);
518                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
519                 spin_unlock_irqrestore(&task->task_state_lock, flags);
520
521                 if (need_reset) {
522                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
523                                     __func__, task);
524                         goto reset;
525                 }
526
527                 SAS_DPRINTK("trying to find task 0x%p\n", task);
528                 res = sas_scsi_find_task(task);
529
530                 cmd->eh_eflags = 0;
531
532                 switch (res) {
533                 case TASK_IS_DONE:
534                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
535                                     task);
536                         sas_eh_finish_cmd(cmd);
537                         continue;
538                 case TASK_IS_ABORTED:
539                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
540                                     __func__, task);
541                         sas_eh_finish_cmd(cmd);
542                         continue;
543                 case TASK_IS_AT_LU:
544                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
545  reset:
546                         tmf_resp = sas_recover_lu(task->dev, cmd);
547                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
548                                 SAS_DPRINTK("dev %016llx LU %x is "
549                                             "recovered\n",
550                                             SAS_ADDR(task->dev),
551                                             cmd->device->lun);
552                                 sas_eh_finish_cmd(cmd);
553                                 sas_scsi_clear_queue_lu(work_q, cmd);
554                                 goto Again;
555                         }
556                         /* fallthrough */
557                 case TASK_IS_NOT_AT_LU:
558                 case TASK_ABORT_FAILED:
559                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
560                                     task);
561                         tmf_resp = sas_recover_I_T(task->dev);
562                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
563                                 struct domain_device *dev = task->dev;
564                                 SAS_DPRINTK("I_T %016llx recovered\n",
565                                             SAS_ADDR(task->dev->sas_addr));
566                                 sas_eh_finish_cmd(cmd);
567                                 sas_scsi_clear_queue_I_T(work_q, dev);
568                                 goto Again;
569                         }
570                         /* Hammer time :-) */
571                         try_to_reset_cmd_device(cmd);
572                         if (i->dft->lldd_clear_nexus_port) {
573                                 struct asd_sas_port *port = task->dev->port;
574                                 SAS_DPRINTK("clearing nexus for port:%d\n",
575                                             port->id);
576                                 res = i->dft->lldd_clear_nexus_port(port);
577                                 if (res == TMF_RESP_FUNC_COMPLETE) {
578                                         SAS_DPRINTK("clear nexus port:%d "
579                                                     "succeeded\n", port->id);
580                                         sas_eh_finish_cmd(cmd);
581                                         sas_scsi_clear_queue_port(work_q,
582                                                                   port);
583                                         goto Again;
584                                 }
585                         }
586                         if (i->dft->lldd_clear_nexus_ha) {
587                                 SAS_DPRINTK("clear nexus ha\n");
588                                 res = i->dft->lldd_clear_nexus_ha(ha);
589                                 if (res == TMF_RESP_FUNC_COMPLETE) {
590                                         SAS_DPRINTK("clear nexus ha "
591                                                     "succeeded\n");
592                                         sas_eh_finish_cmd(cmd);
593                                         goto clear_q;
594                                 }
595                         }
596                         /* If we are here -- this means that no amount
597                          * of effort could recover from errors.  Quite
598                          * possibly the HA just disappeared.
599                          */
600                         SAS_DPRINTK("error from  device %llx, LUN %x "
601                                     "couldn't be recovered in any way\n",
602                                     SAS_ADDR(task->dev->sas_addr),
603                                     cmd->device->lun);
604
605                         sas_eh_finish_cmd(cmd);
606                         goto clear_q;
607                 }
608         }
609         return list_empty(work_q);
610 clear_q:
611         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
612         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
613                 sas_eh_finish_cmd(cmd);
614
615         return list_empty(work_q);
616 }
617
618 void sas_scsi_recover_host(struct Scsi_Host *shost)
619 {
620         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
621         unsigned long flags;
622         LIST_HEAD(eh_work_q);
623
624         spin_lock_irqsave(shost->host_lock, flags);
625         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
626         shost->host_eh_scheduled = 0;
627         spin_unlock_irqrestore(shost->host_lock, flags);
628
629         SAS_DPRINTK("Enter %s\n", __func__);
630         /*
631          * Deal with commands that still have SAS tasks (i.e. they didn't
632          * complete via the normal sas_task completion mechanism)
633          */
634         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
635                 goto out;
636
637         /*
638          * Now deal with SCSI commands that completed ok but have a an error
639          * code (and hopefully sense data) attached.  This is roughly what
640          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
641          * command we see here has no sas_task and is thus unknown to the HA.
642          */
643         if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
644                 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
645                         scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
646
647 out:
648         /* now link into libata eh --- if we have any ata devices */
649         sas_ata_strategy_handler(shost);
650
651         scsi_eh_flush_done_q(&ha->eh_done_q);
652
653         SAS_DPRINTK("--- Exit %s\n", __func__);
654         return;
655 }
656
657 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
658 {
659         struct sas_task *task = TO_SAS_TASK(cmd);
660         unsigned long flags;
661         enum blk_eh_timer_return rtn;
662
663         if (sas_ata_timed_out(cmd, task, &rtn))
664                 return rtn;
665
666         if (!task) {
667                 cmd->request->timeout /= 2;
668                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
669                             cmd, task, (cmd->request->timeout ?
670                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
671                 if (!cmd->request->timeout)
672                         return BLK_EH_NOT_HANDLED;
673                 return BLK_EH_RESET_TIMER;
674         }
675
676         spin_lock_irqsave(&task->task_state_lock, flags);
677         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
678         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
679                 spin_unlock_irqrestore(&task->task_state_lock, flags);
680                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
681                             "BLK_EH_HANDLED\n", cmd, task);
682                 return BLK_EH_HANDLED;
683         }
684         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
685                 spin_unlock_irqrestore(&task->task_state_lock, flags);
686                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
687                             "BLK_EH_RESET_TIMER\n",
688                             cmd, task);
689                 return BLK_EH_RESET_TIMER;
690         }
691         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
692         spin_unlock_irqrestore(&task->task_state_lock, flags);
693
694         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
695                     cmd, task);
696
697         return BLK_EH_NOT_HANDLED;
698 }
699
700 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
701 {
702         struct domain_device *dev = sdev_to_domain_dev(sdev);
703
704         if (dev_is_sata(dev))
705                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
706
707         return -EINVAL;
708 }
709
710 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
711 {
712         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
713         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
714         struct domain_device *found_dev = NULL;
715         int i;
716         unsigned long flags;
717
718         spin_lock_irqsave(&ha->phy_port_lock, flags);
719         for (i = 0; i < ha->num_phys; i++) {
720                 struct asd_sas_port *port = ha->sas_port[i];
721                 struct domain_device *dev;
722
723                 spin_lock(&port->dev_list_lock);
724                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
725                         if (rphy == dev->rphy) {
726                                 found_dev = dev;
727                                 spin_unlock(&port->dev_list_lock);
728                                 goto found;
729                         }
730                 }
731                 spin_unlock(&port->dev_list_lock);
732         }
733  found:
734         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
735
736         return found_dev;
737 }
738
739 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
740 {
741         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
742
743         return sas_find_dev_by_rphy(rphy);
744 }
745
746 int sas_target_alloc(struct scsi_target *starget)
747 {
748         struct domain_device *found_dev = sas_find_target(starget);
749         int res;
750
751         if (!found_dev)
752                 return -ENODEV;
753
754         if (dev_is_sata(found_dev)) {
755                 res = sas_ata_init_host_and_port(found_dev, starget);
756                 if (res)
757                         return res;
758         }
759
760         starget->hostdata = found_dev;
761         return 0;
762 }
763
764 #define SAS_DEF_QD 256
765
766 int sas_slave_configure(struct scsi_device *scsi_dev)
767 {
768         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
769         struct sas_ha_struct *sas_ha;
770
771         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
772
773         if (dev_is_sata(dev)) {
774                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
775                 return 0;
776         }
777
778         sas_ha = dev->port->ha;
779
780         sas_read_port_mode_page(scsi_dev);
781
782         if (scsi_dev->tagged_supported) {
783                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
784                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
785         } else {
786                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
787                             "TCQ\n", SAS_ADDR(dev->sas_addr),
788                             scsi_dev->lun);
789                 scsi_dev->tagged_supported = 0;
790                 scsi_set_tag_type(scsi_dev, 0);
791                 scsi_deactivate_tcq(scsi_dev, 1);
792         }
793
794         scsi_dev->allow_restart = 1;
795
796         return 0;
797 }
798
799 void sas_slave_destroy(struct scsi_device *scsi_dev)
800 {
801         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
802
803         if (dev_is_sata(dev))
804                 sas_to_ata_dev(dev)->class = ATA_DEV_NONE;
805 }
806
807 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
808 {
809         struct domain_device *dev = sdev_to_domain_dev(sdev);
810
811         if (dev_is_sata(dev))
812                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
813                                                 reason);
814
815         switch (reason) {
816         case SCSI_QDEPTH_DEFAULT:
817         case SCSI_QDEPTH_RAMP_UP:
818                 if (!sdev->tagged_supported)
819                         depth = 1;
820                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
821                 break;
822         case SCSI_QDEPTH_QFULL:
823                 scsi_track_queue_full(sdev, depth);
824                 break;
825         default:
826                 return -EOPNOTSUPP;
827         }
828
829         return depth;
830 }
831
832 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
833 {
834         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
835
836         if (dev_is_sata(dev))
837                 return -EINVAL;
838
839         if (!scsi_dev->tagged_supported)
840                 return 0;
841
842         scsi_deactivate_tcq(scsi_dev, 1);
843
844         scsi_set_tag_type(scsi_dev, qt);
845         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
846
847         return qt;
848 }
849
850 int sas_bios_param(struct scsi_device *scsi_dev,
851                           struct block_device *bdev,
852                           sector_t capacity, int *hsc)
853 {
854         hsc[0] = 255;
855         hsc[1] = 63;
856         sector_div(capacity, 255*63);
857         hsc[2] = capacity;
858
859         return 0;
860 }
861
862 /* ---------- Task Collector Thread implementation ---------- */
863
864 static void sas_queue(struct sas_ha_struct *sas_ha)
865 {
866         struct scsi_core *core = &sas_ha->core;
867         unsigned long flags;
868         LIST_HEAD(q);
869         int can_queue;
870         int res;
871         struct sas_internal *i = to_sas_internal(core->shost->transportt);
872
873         spin_lock_irqsave(&core->task_queue_lock, flags);
874         while (!kthread_should_stop() &&
875                !list_empty(&core->task_queue)) {
876
877                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
878                 if (can_queue >= 0) {
879                         can_queue = core->task_queue_size;
880                         list_splice_init(&core->task_queue, &q);
881                 } else {
882                         struct list_head *a, *n;
883
884                         can_queue = sas_ha->lldd_queue_size;
885                         list_for_each_safe(a, n, &core->task_queue) {
886                                 list_move_tail(a, &q);
887                                 if (--can_queue == 0)
888                                         break;
889                         }
890                         can_queue = sas_ha->lldd_queue_size;
891                 }
892                 core->task_queue_size -= can_queue;
893                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
894                 {
895                         struct sas_task *task = list_entry(q.next,
896                                                            struct sas_task,
897                                                            list);
898                         list_del_init(&q);
899                         res = i->dft->lldd_execute_task(task, can_queue,
900                                                         GFP_KERNEL);
901                         if (unlikely(res))
902                                 __list_add(&q, task->list.prev, &task->list);
903                 }
904                 spin_lock_irqsave(&core->task_queue_lock, flags);
905                 if (res) {
906                         list_splice_init(&q, &core->task_queue); /*at head*/
907                         core->task_queue_size += can_queue;
908                 }
909         }
910         spin_unlock_irqrestore(&core->task_queue_lock, flags);
911 }
912
913 /**
914  * sas_queue_thread -- The Task Collector thread
915  * @_sas_ha: pointer to struct sas_ha
916  */
917 static int sas_queue_thread(void *_sas_ha)
918 {
919         struct sas_ha_struct *sas_ha = _sas_ha;
920
921         while (1) {
922                 set_current_state(TASK_INTERRUPTIBLE);
923                 schedule();
924                 sas_queue(sas_ha);
925                 if (kthread_should_stop())
926                         break;
927         }
928
929         return 0;
930 }
931
932 int sas_init_queue(struct sas_ha_struct *sas_ha)
933 {
934         struct scsi_core *core = &sas_ha->core;
935
936         spin_lock_init(&core->task_queue_lock);
937         core->task_queue_size = 0;
938         INIT_LIST_HEAD(&core->task_queue);
939
940         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
941                                          "sas_queue_%d", core->shost->host_no);
942         if (IS_ERR(core->queue_thread))
943                 return PTR_ERR(core->queue_thread);
944         return 0;
945 }
946
947 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
948 {
949         unsigned long flags;
950         struct scsi_core *core = &sas_ha->core;
951         struct sas_task *task, *n;
952
953         kthread_stop(core->queue_thread);
954
955         if (!list_empty(&core->task_queue))
956                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
957                             SAS_ADDR(sas_ha->sas_addr));
958
959         spin_lock_irqsave(&core->task_queue_lock, flags);
960         list_for_each_entry_safe(task, n, &core->task_queue, list) {
961                 struct scsi_cmnd *cmd = task->uldd_task;
962
963                 list_del_init(&task->list);
964
965                 ASSIGN_SAS_TASK(cmd, NULL);
966                 sas_free_task(task);
967                 cmd->result = DID_ABORT << 16;
968                 cmd->scsi_done(cmd);
969         }
970         spin_unlock_irqrestore(&core->task_queue_lock, flags);
971 }
972
973 /*
974  * Call the LLDD task abort routine directly.  This function is intended for
975  * use by upper layers that need to tell the LLDD to abort a task.
976  */
977 int __sas_task_abort(struct sas_task *task)
978 {
979         struct sas_internal *si =
980                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
981         unsigned long flags;
982         int res;
983
984         spin_lock_irqsave(&task->task_state_lock, flags);
985         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
986             task->task_state_flags & SAS_TASK_STATE_DONE) {
987                 spin_unlock_irqrestore(&task->task_state_lock, flags);
988                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
989                             task);
990                 return 0;
991         }
992         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
993         spin_unlock_irqrestore(&task->task_state_lock, flags);
994
995         if (!si->dft->lldd_abort_task)
996                 return -ENODEV;
997
998         res = si->dft->lldd_abort_task(task);
999
1000         spin_lock_irqsave(&task->task_state_lock, flags);
1001         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1002             (res == TMF_RESP_FUNC_COMPLETE))
1003         {
1004                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1005                 task->task_done(task);
1006                 return 0;
1007         }
1008
1009         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1010                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1011         spin_unlock_irqrestore(&task->task_state_lock, flags);
1012
1013         return -EAGAIN;
1014 }
1015
1016 /*
1017  * Tell an upper layer that it needs to initiate an abort for a given task.
1018  * This should only ever be called by an LLDD.
1019  */
1020 void sas_task_abort(struct sas_task *task)
1021 {
1022         struct scsi_cmnd *sc = task->uldd_task;
1023
1024         /* Escape for libsas internal commands */
1025         if (!sc) {
1026                 if (!del_timer(&task->timer))
1027                         return;
1028                 task->timer.function(task->timer.data);
1029                 return;
1030         }
1031
1032         if (dev_is_sata(task->dev)) {
1033                 sas_ata_task_abort(task);
1034         } else {
1035                 struct request_queue *q = sc->device->request_queue;
1036                 unsigned long flags;
1037
1038                 spin_lock_irqsave(q->queue_lock, flags);
1039                 blk_abort_request(sc->request);
1040                 spin_unlock_irqrestore(q->queue_lock, flags);
1041                 scsi_schedule_eh(sc->device->host);
1042         }
1043 }
1044
1045 int sas_slave_alloc(struct scsi_device *scsi_dev)
1046 {
1047         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1048
1049         if (dev_is_sata(dev))
1050                 return ata_sas_port_init(dev->sata_dev.ap);
1051
1052         return 0;
1053 }
1054
1055 void sas_target_destroy(struct scsi_target *starget)
1056 {
1057         struct domain_device *found_dev = sas_find_target(starget);
1058
1059         if (!found_dev)
1060                 return;
1061
1062         if (dev_is_sata(found_dev))
1063                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1064
1065         return;
1066 }
1067
1068 static void sas_parse_addr(u8 *sas_addr, const char *p)
1069 {
1070         int i;
1071         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1072                 u8 h, l;
1073                 if (!*p)
1074                         break;
1075                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1076                 p++;
1077                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1078                 p++;
1079                 sas_addr[i] = (h<<4) | l;
1080         }
1081 }
1082
1083 #define SAS_STRING_ADDR_SIZE    16
1084
1085 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1086 {
1087         int res;
1088         const struct firmware *fw;
1089
1090         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1091         if (res)
1092                 return res;
1093
1094         if (fw->size < SAS_STRING_ADDR_SIZE) {
1095                 res = -ENODEV;
1096                 goto out;
1097         }
1098
1099         sas_parse_addr(addr, fw->data);
1100
1101 out:
1102         release_firmware(fw);
1103         return res;
1104 }
1105 EXPORT_SYMBOL_GPL(sas_request_addr);
1106
1107 EXPORT_SYMBOL_GPL(sas_queuecommand);
1108 EXPORT_SYMBOL_GPL(sas_target_alloc);
1109 EXPORT_SYMBOL_GPL(sas_slave_configure);
1110 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1111 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1112 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1113 EXPORT_SYMBOL_GPL(sas_bios_param);
1114 EXPORT_SYMBOL_GPL(__sas_task_abort);
1115 EXPORT_SYMBOL_GPL(sas_task_abort);
1116 EXPORT_SYMBOL_GPL(sas_phy_reset);
1117 EXPORT_SYMBOL_GPL(sas_phy_enable);
1118 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1119 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1120 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1121 EXPORT_SYMBOL_GPL(sas_target_destroy);
1122 EXPORT_SYMBOL_GPL(sas_ioctl);