Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
[linux-2.6] / drivers / scsi / libsas / sas_scsi_host.c
1 /*
2  * Serial Attached SCSI (SAS) class SCSI Host glue.
3  *
4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6  *
7  * This file is licensed under GPLv2.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of the
12  * License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22  * USA
23  *
24  */
25
26 #include <linux/kthread.h>
27 #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/scatterlist.h>
48 #include <linux/libata.h>
49
50 /* ---------- SCSI Host glue ---------- */
51
52 static void sas_scsi_task_done(struct sas_task *task)
53 {
54         struct task_status_struct *ts = &task->task_status;
55         struct scsi_cmnd *sc = task->uldd_task;
56         int hs = 0, stat = 0;
57
58         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
59                 /* Aborted tasks will be completed by the error handler */
60                 SAS_DPRINTK("task done but aborted\n");
61                 return;
62         }
63
64         if (unlikely(!sc)) {
65                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
66                 list_del_init(&task->list);
67                 sas_free_task(task);
68                 return;
69         }
70
71         if (ts->resp == SAS_TASK_UNDELIVERED) {
72                 /* transport error */
73                 hs = DID_NO_CONNECT;
74         } else { /* ts->resp == SAS_TASK_COMPLETE */
75                 /* task delivered, what happened afterwards? */
76                 switch (ts->stat) {
77                 case SAS_DEV_NO_RESPONSE:
78                 case SAS_INTERRUPTED:
79                 case SAS_PHY_DOWN:
80                 case SAS_NAK_R_ERR:
81                 case SAS_OPEN_TO:
82                         hs = DID_NO_CONNECT;
83                         break;
84                 case SAS_DATA_UNDERRUN:
85                         scsi_set_resid(sc, ts->residual);
86                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
87                                 hs = DID_ERROR;
88                         break;
89                 case SAS_DATA_OVERRUN:
90                         hs = DID_ERROR;
91                         break;
92                 case SAS_QUEUE_FULL:
93                         hs = DID_SOFT_ERROR; /* retry */
94                         break;
95                 case SAS_DEVICE_UNKNOWN:
96                         hs = DID_BAD_TARGET;
97                         break;
98                 case SAS_SG_ERR:
99                         hs = DID_PARITY;
100                         break;
101                 case SAS_OPEN_REJECT:
102                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
103                                 hs = DID_SOFT_ERROR; /* retry */
104                         else
105                                 hs = DID_ERROR;
106                         break;
107                 case SAS_PROTO_RESPONSE:
108                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
109                                     "task; please report this\n",
110                                     task->dev->port->ha->sas_ha_name);
111                         break;
112                 case SAS_ABORTED_TASK:
113                         hs = DID_ABORT;
114                         break;
115                 case SAM_CHECK_COND:
116                         memcpy(sc->sense_buffer, ts->buf,
117                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
118                         stat = SAM_CHECK_COND;
119                         break;
120                 default:
121                         stat = ts->stat;
122                         break;
123                 }
124         }
125         ASSIGN_SAS_TASK(sc, NULL);
126         sc->result = (hs << 16) | stat;
127         list_del_init(&task->list);
128         sas_free_task(task);
129         sc->scsi_done(sc);
130 }
131
132 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
133 {
134         enum task_attribute ta = TASK_ATTR_SIMPLE;
135         if (cmd->request && blk_rq_tagged(cmd->request)) {
136                 if (cmd->device->ordered_tags &&
137                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
138                         ta = TASK_ATTR_ORDERED;
139         }
140         return ta;
141 }
142
143 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
144                                                struct domain_device *dev,
145                                                gfp_t gfp_flags)
146 {
147         struct sas_task *task = sas_alloc_task(gfp_flags);
148         struct scsi_lun lun;
149
150         if (!task)
151                 return NULL;
152
153         task->uldd_task = cmd;
154         ASSIGN_SAS_TASK(cmd, task);
155
156         task->dev = dev;
157         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
158
159         task->ssp_task.retry_count = 1;
160         int_to_scsilun(cmd->device->lun, &lun);
161         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
162         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
163         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
164
165         task->scatter = scsi_sglist(cmd);
166         task->num_scatter = scsi_sg_count(cmd);
167         task->total_xfer_len = scsi_bufflen(cmd);
168         task->data_dir = cmd->sc_data_direction;
169
170         task->task_done = sas_scsi_task_done;
171
172         return task;
173 }
174
175 int sas_queue_up(struct sas_task *task)
176 {
177         struct sas_ha_struct *sas_ha = task->dev->port->ha;
178         struct scsi_core *core = &sas_ha->core;
179         unsigned long flags;
180         LIST_HEAD(list);
181
182         spin_lock_irqsave(&core->task_queue_lock, flags);
183         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
184                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
185                 return -SAS_QUEUE_FULL;
186         }
187         list_add_tail(&task->list, &core->task_queue);
188         core->task_queue_size += 1;
189         spin_unlock_irqrestore(&core->task_queue_lock, flags);
190         wake_up_process(core->queue_thread);
191
192         return 0;
193 }
194
195 /**
196  * sas_queuecommand -- Enqueue a command for processing
197  * @parameters: See SCSI Core documentation
198  *
199  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
200  * call us without holding an IRQ spinlock...
201  */
202 int sas_queuecommand(struct scsi_cmnd *cmd,
203                      void (*scsi_done)(struct scsi_cmnd *))
204         __releases(host->host_lock)
205         __acquires(dev->sata_dev.ap->lock)
206         __releases(dev->sata_dev.ap->lock)
207         __acquires(host->host_lock)
208 {
209         int res = 0;
210         struct domain_device *dev = cmd_to_domain_dev(cmd);
211         struct Scsi_Host *host = cmd->device->host;
212         struct sas_internal *i = to_sas_internal(host->transportt);
213
214         spin_unlock_irq(host->host_lock);
215
216         {
217                 struct sas_ha_struct *sas_ha = dev->port->ha;
218                 struct sas_task *task;
219
220                 if (dev_is_sata(dev)) {
221                         unsigned long flags;
222
223                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
224                         res = ata_sas_queuecmd(cmd, scsi_done,
225                                                dev->sata_dev.ap);
226                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
227                         goto out;
228                 }
229
230                 res = -ENOMEM;
231                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
232                 if (!task)
233                         goto out;
234
235                 cmd->scsi_done = scsi_done;
236                 /* Queue up, Direct Mode or Task Collector Mode. */
237                 if (sas_ha->lldd_max_execute_num < 2)
238                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
239                 else
240                         res = sas_queue_up(task);
241
242                 /* Examine */
243                 if (res) {
244                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
245                         ASSIGN_SAS_TASK(cmd, NULL);
246                         sas_free_task(task);
247                         if (res == -SAS_QUEUE_FULL) {
248                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
249                                 res = 0;
250                                 scsi_done(cmd);
251                         }
252                         goto out;
253                 }
254         }
255 out:
256         spin_lock_irq(host->host_lock);
257         return res;
258 }
259
260 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
261 {
262         struct sas_task *task = TO_SAS_TASK(cmd);
263         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
264
265         /* remove the aborted task flag to allow the task to be
266          * completed now. At this point, we only get called following
267          * an actual abort of the task, so we should be guaranteed not
268          * to be racing with any completions from the LLD (hence we
269          * don't need the task state lock to clear the flag) */
270         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
271         /* Now call task_done.  However, task will be free'd after
272          * this */
273         task->task_done(task);
274         /* now finish the command and move it on to the error
275          * handler done list, this also takes it off the
276          * error handler pending list */
277         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
278 }
279
280 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
281 {
282         struct scsi_cmnd *cmd, *n;
283
284         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
285                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
286                     cmd->device->lun == my_cmd->device->lun)
287                         sas_eh_finish_cmd(cmd);
288         }
289 }
290
291 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
292                                      struct domain_device *dev)
293 {
294         struct scsi_cmnd *cmd, *n;
295
296         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
297                 struct domain_device *x = cmd_to_domain_dev(cmd);
298
299                 if (x == dev)
300                         sas_eh_finish_cmd(cmd);
301         }
302 }
303
304 static void sas_scsi_clear_queue_port(struct list_head *error_q,
305                                       struct asd_sas_port *port)
306 {
307         struct scsi_cmnd *cmd, *n;
308
309         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
310                 struct domain_device *dev = cmd_to_domain_dev(cmd);
311                 struct asd_sas_port *x = dev->port;
312
313                 if (x == port)
314                         sas_eh_finish_cmd(cmd);
315         }
316 }
317
318 enum task_disposition {
319         TASK_IS_DONE,
320         TASK_IS_ABORTED,
321         TASK_IS_AT_LU,
322         TASK_IS_NOT_AT_LU,
323         TASK_ABORT_FAILED,
324 };
325
326 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
327 {
328         struct sas_ha_struct *ha = task->dev->port->ha;
329         unsigned long flags;
330         int i, res;
331         struct sas_internal *si =
332                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
333
334         if (ha->lldd_max_execute_num > 1) {
335                 struct scsi_core *core = &ha->core;
336                 struct sas_task *t, *n;
337
338                 spin_lock_irqsave(&core->task_queue_lock, flags);
339                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
340                         if (task == t) {
341                                 list_del_init(&t->list);
342                                 spin_unlock_irqrestore(&core->task_queue_lock,
343                                                        flags);
344                                 SAS_DPRINTK("%s: task 0x%p aborted from "
345                                             "task_queue\n",
346                                             __func__, task);
347                                 return TASK_IS_ABORTED;
348                         }
349                 }
350                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351         }
352
353         for (i = 0; i < 5; i++) {
354                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
355                 res = si->dft->lldd_abort_task(task);
356
357                 spin_lock_irqsave(&task->task_state_lock, flags);
358                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
359                         spin_unlock_irqrestore(&task->task_state_lock, flags);
360                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
361                                     task);
362                         return TASK_IS_DONE;
363                 }
364                 spin_unlock_irqrestore(&task->task_state_lock, flags);
365
366                 if (res == TMF_RESP_FUNC_COMPLETE) {
367                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
368                                     __func__, task);
369                         return TASK_IS_ABORTED;
370                 } else if (si->dft->lldd_query_task) {
371                         SAS_DPRINTK("%s: querying task 0x%p\n",
372                                     __func__, task);
373                         res = si->dft->lldd_query_task(task);
374                         switch (res) {
375                         case TMF_RESP_FUNC_SUCC:
376                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
377                                             __func__, task);
378                                 return TASK_IS_AT_LU;
379                         case TMF_RESP_FUNC_COMPLETE:
380                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
381                                             __func__, task);
382                                 return TASK_IS_NOT_AT_LU;
383                         case TMF_RESP_FUNC_FAILED:
384                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
385                                                 __func__, task);
386                                 return TASK_ABORT_FAILED;
387                         }
388
389                 }
390         }
391         return res;
392 }
393
394 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
395 {
396         int res = TMF_RESP_FUNC_FAILED;
397         struct scsi_lun lun;
398         struct sas_internal *i =
399                 to_sas_internal(dev->port->ha->core.shost->transportt);
400
401         int_to_scsilun(cmd->device->lun, &lun);
402
403         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
404                     SAS_ADDR(dev->sas_addr),
405                     cmd->device->lun);
406
407         if (i->dft->lldd_abort_task_set)
408                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
409
410         if (res == TMF_RESP_FUNC_FAILED) {
411                 if (i->dft->lldd_clear_task_set)
412                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
413         }
414
415         if (res == TMF_RESP_FUNC_FAILED) {
416                 if (i->dft->lldd_lu_reset)
417                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
418         }
419
420         return res;
421 }
422
423 static int sas_recover_I_T(struct domain_device *dev)
424 {
425         int res = TMF_RESP_FUNC_FAILED;
426         struct sas_internal *i =
427                 to_sas_internal(dev->port->ha->core.shost->transportt);
428
429         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
430                     SAS_ADDR(dev->sas_addr));
431
432         if (i->dft->lldd_I_T_nexus_reset)
433                 res = i->dft->lldd_I_T_nexus_reset(dev);
434
435         return res;
436 }
437
438 /* Find the sas_phy that's attached to this device */
439 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
440 {
441         struct domain_device *pdev = dev->parent;
442         struct ex_phy *exphy = NULL;
443         int i;
444
445         /* Directly attached device */
446         if (!pdev)
447                 return dev->port->phy;
448
449         /* Otherwise look in the expander */
450         for (i = 0; i < pdev->ex_dev.num_phys; i++)
451                 if (!memcmp(dev->sas_addr,
452                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
453                             SAS_ADDR_SIZE)) {
454                         exphy = &pdev->ex_dev.ex_phy[i];
455                         break;
456                 }
457
458         BUG_ON(!exphy);
459         return exphy->phy;
460 }
461 EXPORT_SYMBOL_GPL(sas_find_local_phy);
462
463 /* Attempt to send a LUN reset message to a device */
464 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
465 {
466         struct domain_device *dev = cmd_to_domain_dev(cmd);
467         struct sas_internal *i =
468                 to_sas_internal(dev->port->ha->core.shost->transportt);
469         struct scsi_lun lun;
470         int res;
471
472         int_to_scsilun(cmd->device->lun, &lun);
473
474         if (!i->dft->lldd_lu_reset)
475                 return FAILED;
476
477         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
478         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
479                 return SUCCESS;
480
481         return FAILED;
482 }
483
484 /* Attempt to send a phy (bus) reset */
485 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
486 {
487         struct domain_device *dev = cmd_to_domain_dev(cmd);
488         struct sas_phy *phy = sas_find_local_phy(dev);
489         int res;
490
491         res = sas_phy_reset(phy, 1);
492         if (res)
493                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
494                             kobject_name(&phy->dev.kobj),
495                             res);
496         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
497                 return SUCCESS;
498
499         return FAILED;
500 }
501
502 /* Try to reset a device */
503 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
504 {
505         int res;
506         struct Scsi_Host *shost = cmd->device->host;
507
508         if (!shost->hostt->eh_device_reset_handler)
509                 goto try_bus_reset;
510
511         res = shost->hostt->eh_device_reset_handler(cmd);
512         if (res == SUCCESS)
513                 return res;
514
515 try_bus_reset:
516         if (shost->hostt->eh_bus_reset_handler)
517                 return shost->hostt->eh_bus_reset_handler(cmd);
518
519         return FAILED;
520 }
521
522 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
523                                     struct list_head *work_q,
524                                     struct list_head *done_q)
525 {
526         struct scsi_cmnd *cmd, *n;
527         enum task_disposition res = TASK_IS_DONE;
528         int tmf_resp, need_reset;
529         struct sas_internal *i = to_sas_internal(shost->transportt);
530         unsigned long flags;
531         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
532
533 Again:
534         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
535                 struct sas_task *task = TO_SAS_TASK(cmd);
536
537                 if (!task)
538                         continue;
539
540                 list_del_init(&cmd->eh_entry);
541
542                 spin_lock_irqsave(&task->task_state_lock, flags);
543                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
544                 spin_unlock_irqrestore(&task->task_state_lock, flags);
545
546                 if (need_reset) {
547                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
548                                     __func__, task);
549                         goto reset;
550                 }
551
552                 SAS_DPRINTK("trying to find task 0x%p\n", task);
553                 res = sas_scsi_find_task(task);
554
555                 cmd->eh_eflags = 0;
556
557                 switch (res) {
558                 case TASK_IS_DONE:
559                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
560                                     task);
561                         sas_eh_finish_cmd(cmd);
562                         continue;
563                 case TASK_IS_ABORTED:
564                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
565                                     __func__, task);
566                         sas_eh_finish_cmd(cmd);
567                         continue;
568                 case TASK_IS_AT_LU:
569                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
570  reset:
571                         tmf_resp = sas_recover_lu(task->dev, cmd);
572                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
573                                 SAS_DPRINTK("dev %016llx LU %x is "
574                                             "recovered\n",
575                                             SAS_ADDR(task->dev),
576                                             cmd->device->lun);
577                                 sas_eh_finish_cmd(cmd);
578                                 sas_scsi_clear_queue_lu(work_q, cmd);
579                                 goto Again;
580                         }
581                         /* fallthrough */
582                 case TASK_IS_NOT_AT_LU:
583                 case TASK_ABORT_FAILED:
584                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
585                                     task);
586                         tmf_resp = sas_recover_I_T(task->dev);
587                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
588                                 struct domain_device *dev = task->dev;
589                                 SAS_DPRINTK("I_T %016llx recovered\n",
590                                             SAS_ADDR(task->dev->sas_addr));
591                                 sas_eh_finish_cmd(cmd);
592                                 sas_scsi_clear_queue_I_T(work_q, dev);
593                                 goto Again;
594                         }
595                         /* Hammer time :-) */
596                         try_to_reset_cmd_device(cmd);
597                         if (i->dft->lldd_clear_nexus_port) {
598                                 struct asd_sas_port *port = task->dev->port;
599                                 SAS_DPRINTK("clearing nexus for port:%d\n",
600                                             port->id);
601                                 res = i->dft->lldd_clear_nexus_port(port);
602                                 if (res == TMF_RESP_FUNC_COMPLETE) {
603                                         SAS_DPRINTK("clear nexus port:%d "
604                                                     "succeeded\n", port->id);
605                                         sas_eh_finish_cmd(cmd);
606                                         sas_scsi_clear_queue_port(work_q,
607                                                                   port);
608                                         goto Again;
609                                 }
610                         }
611                         if (i->dft->lldd_clear_nexus_ha) {
612                                 SAS_DPRINTK("clear nexus ha\n");
613                                 res = i->dft->lldd_clear_nexus_ha(ha);
614                                 if (res == TMF_RESP_FUNC_COMPLETE) {
615                                         SAS_DPRINTK("clear nexus ha "
616                                                     "succeeded\n");
617                                         sas_eh_finish_cmd(cmd);
618                                         goto clear_q;
619                                 }
620                         }
621                         /* If we are here -- this means that no amount
622                          * of effort could recover from errors.  Quite
623                          * possibly the HA just disappeared.
624                          */
625                         SAS_DPRINTK("error from  device %llx, LUN %x "
626                                     "couldn't be recovered in any way\n",
627                                     SAS_ADDR(task->dev->sas_addr),
628                                     cmd->device->lun);
629
630                         sas_eh_finish_cmd(cmd);
631                         goto clear_q;
632                 }
633         }
634         return list_empty(work_q);
635 clear_q:
636         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
637         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
638                 sas_eh_finish_cmd(cmd);
639
640         return list_empty(work_q);
641 }
642
643 void sas_scsi_recover_host(struct Scsi_Host *shost)
644 {
645         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
646         unsigned long flags;
647         LIST_HEAD(eh_work_q);
648
649         spin_lock_irqsave(shost->host_lock, flags);
650         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
651         spin_unlock_irqrestore(shost->host_lock, flags);
652
653         SAS_DPRINTK("Enter %s\n", __func__);
654         /*
655          * Deal with commands that still have SAS tasks (i.e. they didn't
656          * complete via the normal sas_task completion mechanism)
657          */
658         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
659                 goto out;
660
661         /*
662          * Now deal with SCSI commands that completed ok but have a an error
663          * code (and hopefully sense data) attached.  This is roughly what
664          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
665          * command we see here has no sas_task and is thus unknown to the HA.
666          */
667         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
668                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
669
670 out:
671         scsi_eh_flush_done_q(&ha->eh_done_q);
672         SAS_DPRINTK("--- Exit %s\n", __func__);
673         return;
674 }
675
676 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
677 {
678         struct sas_task *task = TO_SAS_TASK(cmd);
679         unsigned long flags;
680
681         if (!task) {
682                 cmd->request->timeout /= 2;
683                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
684                             cmd, task, (cmd->request->timeout ?
685                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
686                 if (!cmd->request->timeout)
687                         return BLK_EH_NOT_HANDLED;
688                 return BLK_EH_RESET_TIMER;
689         }
690
691         spin_lock_irqsave(&task->task_state_lock, flags);
692         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
693         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
694                 spin_unlock_irqrestore(&task->task_state_lock, flags);
695                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
696                             "BLK_EH_HANDLED\n", cmd, task);
697                 return BLK_EH_HANDLED;
698         }
699         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
700                 spin_unlock_irqrestore(&task->task_state_lock, flags);
701                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
702                             "BLK_EH_RESET_TIMER\n",
703                             cmd, task);
704                 return BLK_EH_RESET_TIMER;
705         }
706         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
707         spin_unlock_irqrestore(&task->task_state_lock, flags);
708
709         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
710                     cmd, task);
711
712         return BLK_EH_NOT_HANDLED;
713 }
714
715 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
716 {
717         struct domain_device *dev = sdev_to_domain_dev(sdev);
718
719         if (dev_is_sata(dev))
720                 return ata_scsi_ioctl(sdev, cmd, arg);
721
722         return -EINVAL;
723 }
724
725 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
726 {
727         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
728         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
729         struct domain_device *found_dev = NULL;
730         int i;
731         unsigned long flags;
732
733         spin_lock_irqsave(&ha->phy_port_lock, flags);
734         for (i = 0; i < ha->num_phys; i++) {
735                 struct asd_sas_port *port = ha->sas_port[i];
736                 struct domain_device *dev;
737
738                 spin_lock(&port->dev_list_lock);
739                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
740                         if (rphy == dev->rphy) {
741                                 found_dev = dev;
742                                 spin_unlock(&port->dev_list_lock);
743                                 goto found;
744                         }
745                 }
746                 spin_unlock(&port->dev_list_lock);
747         }
748  found:
749         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
750
751         return found_dev;
752 }
753
754 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
755 {
756         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
757
758         return sas_find_dev_by_rphy(rphy);
759 }
760
761 int sas_target_alloc(struct scsi_target *starget)
762 {
763         struct domain_device *found_dev = sas_find_target(starget);
764         int res;
765
766         if (!found_dev)
767                 return -ENODEV;
768
769         if (dev_is_sata(found_dev)) {
770                 res = sas_ata_init_host_and_port(found_dev, starget);
771                 if (res)
772                         return res;
773         }
774
775         starget->hostdata = found_dev;
776         return 0;
777 }
778
779 #define SAS_DEF_QD 32
780 #define SAS_MAX_QD 64
781
782 int sas_slave_configure(struct scsi_device *scsi_dev)
783 {
784         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
785         struct sas_ha_struct *sas_ha;
786
787         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
788
789         if (dev_is_sata(dev)) {
790                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
791                 return 0;
792         }
793
794         sas_ha = dev->port->ha;
795
796         sas_read_port_mode_page(scsi_dev);
797
798         if (scsi_dev->tagged_supported) {
799                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
800                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
801         } else {
802                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
803                             "TCQ\n", SAS_ADDR(dev->sas_addr),
804                             scsi_dev->lun);
805                 scsi_dev->tagged_supported = 0;
806                 scsi_set_tag_type(scsi_dev, 0);
807                 scsi_deactivate_tcq(scsi_dev, 1);
808         }
809
810         scsi_dev->allow_restart = 1;
811
812         return 0;
813 }
814
815 void sas_slave_destroy(struct scsi_device *scsi_dev)
816 {
817         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
818
819         if (dev_is_sata(dev))
820                 ata_port_disable(dev->sata_dev.ap);
821 }
822
823 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
824 {
825         int res = min(new_depth, SAS_MAX_QD);
826
827         if (scsi_dev->tagged_supported)
828                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
829                                         res);
830         else {
831                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
832                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
833                            SAS_ADDR(dev->sas_addr),
834                            scsi_dev->lun);
835                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
836                 res = 1;
837         }
838
839         return res;
840 }
841
842 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
843 {
844         if (!scsi_dev->tagged_supported)
845                 return 0;
846
847         scsi_deactivate_tcq(scsi_dev, 1);
848
849         scsi_set_tag_type(scsi_dev, qt);
850         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
851
852         return qt;
853 }
854
855 int sas_bios_param(struct scsi_device *scsi_dev,
856                           struct block_device *bdev,
857                           sector_t capacity, int *hsc)
858 {
859         hsc[0] = 255;
860         hsc[1] = 63;
861         sector_div(capacity, 255*63);
862         hsc[2] = capacity;
863
864         return 0;
865 }
866
867 /* ---------- Task Collector Thread implementation ---------- */
868
869 static void sas_queue(struct sas_ha_struct *sas_ha)
870 {
871         struct scsi_core *core = &sas_ha->core;
872         unsigned long flags;
873         LIST_HEAD(q);
874         int can_queue;
875         int res;
876         struct sas_internal *i = to_sas_internal(core->shost->transportt);
877
878         spin_lock_irqsave(&core->task_queue_lock, flags);
879         while (!kthread_should_stop() &&
880                !list_empty(&core->task_queue)) {
881
882                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
883                 if (can_queue >= 0) {
884                         can_queue = core->task_queue_size;
885                         list_splice_init(&core->task_queue, &q);
886                 } else {
887                         struct list_head *a, *n;
888
889                         can_queue = sas_ha->lldd_queue_size;
890                         list_for_each_safe(a, n, &core->task_queue) {
891                                 list_move_tail(a, &q);
892                                 if (--can_queue == 0)
893                                         break;
894                         }
895                         can_queue = sas_ha->lldd_queue_size;
896                 }
897                 core->task_queue_size -= can_queue;
898                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
899                 {
900                         struct sas_task *task = list_entry(q.next,
901                                                            struct sas_task,
902                                                            list);
903                         list_del_init(&q);
904                         res = i->dft->lldd_execute_task(task, can_queue,
905                                                         GFP_KERNEL);
906                         if (unlikely(res))
907                                 __list_add(&q, task->list.prev, &task->list);
908                 }
909                 spin_lock_irqsave(&core->task_queue_lock, flags);
910                 if (res) {
911                         list_splice_init(&q, &core->task_queue); /*at head*/
912                         core->task_queue_size += can_queue;
913                 }
914         }
915         spin_unlock_irqrestore(&core->task_queue_lock, flags);
916 }
917
918 /**
919  * sas_queue_thread -- The Task Collector thread
920  * @_sas_ha: pointer to struct sas_ha
921  */
922 static int sas_queue_thread(void *_sas_ha)
923 {
924         struct sas_ha_struct *sas_ha = _sas_ha;
925
926         while (1) {
927                 set_current_state(TASK_INTERRUPTIBLE);
928                 schedule();
929                 sas_queue(sas_ha);
930                 if (kthread_should_stop())
931                         break;
932         }
933
934         return 0;
935 }
936
937 int sas_init_queue(struct sas_ha_struct *sas_ha)
938 {
939         struct scsi_core *core = &sas_ha->core;
940
941         spin_lock_init(&core->task_queue_lock);
942         core->task_queue_size = 0;
943         INIT_LIST_HEAD(&core->task_queue);
944
945         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
946                                          "sas_queue_%d", core->shost->host_no);
947         if (IS_ERR(core->queue_thread))
948                 return PTR_ERR(core->queue_thread);
949         return 0;
950 }
951
952 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
953 {
954         unsigned long flags;
955         struct scsi_core *core = &sas_ha->core;
956         struct sas_task *task, *n;
957
958         kthread_stop(core->queue_thread);
959
960         if (!list_empty(&core->task_queue))
961                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
962                             SAS_ADDR(sas_ha->sas_addr));
963
964         spin_lock_irqsave(&core->task_queue_lock, flags);
965         list_for_each_entry_safe(task, n, &core->task_queue, list) {
966                 struct scsi_cmnd *cmd = task->uldd_task;
967
968                 list_del_init(&task->list);
969
970                 ASSIGN_SAS_TASK(cmd, NULL);
971                 sas_free_task(task);
972                 cmd->result = DID_ABORT << 16;
973                 cmd->scsi_done(cmd);
974         }
975         spin_unlock_irqrestore(&core->task_queue_lock, flags);
976 }
977
978 /*
979  * Call the LLDD task abort routine directly.  This function is intended for
980  * use by upper layers that need to tell the LLDD to abort a task.
981  */
982 int __sas_task_abort(struct sas_task *task)
983 {
984         struct sas_internal *si =
985                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
986         unsigned long flags;
987         int res;
988
989         spin_lock_irqsave(&task->task_state_lock, flags);
990         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
991             task->task_state_flags & SAS_TASK_STATE_DONE) {
992                 spin_unlock_irqrestore(&task->task_state_lock, flags);
993                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
994                             task);
995                 return 0;
996         }
997         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
998         spin_unlock_irqrestore(&task->task_state_lock, flags);
999
1000         if (!si->dft->lldd_abort_task)
1001                 return -ENODEV;
1002
1003         res = si->dft->lldd_abort_task(task);
1004
1005         spin_lock_irqsave(&task->task_state_lock, flags);
1006         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1007             (res == TMF_RESP_FUNC_COMPLETE))
1008         {
1009                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1010                 task->task_done(task);
1011                 return 0;
1012         }
1013
1014         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1015                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1016         spin_unlock_irqrestore(&task->task_state_lock, flags);
1017
1018         return -EAGAIN;
1019 }
1020
1021 /*
1022  * Tell an upper layer that it needs to initiate an abort for a given task.
1023  * This should only ever be called by an LLDD.
1024  */
1025 void sas_task_abort(struct sas_task *task)
1026 {
1027         struct scsi_cmnd *sc = task->uldd_task;
1028
1029         /* Escape for libsas internal commands */
1030         if (!sc) {
1031                 if (!del_timer(&task->timer))
1032                         return;
1033                 task->timer.function(task->timer.data);
1034                 return;
1035         }
1036
1037         if (dev_is_sata(task->dev)) {
1038                 sas_ata_task_abort(task);
1039                 return;
1040         }
1041
1042         blk_abort_request(sc->request);
1043         scsi_schedule_eh(sc->device->host);
1044 }
1045
1046 int sas_slave_alloc(struct scsi_device *scsi_dev)
1047 {
1048         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1049
1050         if (dev_is_sata(dev))
1051                 return ata_sas_port_init(dev->sata_dev.ap);
1052
1053         return 0;
1054 }
1055
1056 void sas_target_destroy(struct scsi_target *starget)
1057 {
1058         struct domain_device *found_dev = sas_find_target(starget);
1059
1060         if (!found_dev)
1061                 return;
1062
1063         if (dev_is_sata(found_dev))
1064                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1065
1066         return;
1067 }
1068
1069 static void sas_parse_addr(u8 *sas_addr, const char *p)
1070 {
1071         int i;
1072         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1073                 u8 h, l;
1074                 if (!*p)
1075                         break;
1076                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1077                 p++;
1078                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1079                 p++;
1080                 sas_addr[i] = (h<<4) | l;
1081         }
1082 }
1083
1084 #define SAS_STRING_ADDR_SIZE    16
1085
1086 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1087 {
1088         int res;
1089         const struct firmware *fw;
1090
1091         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1092         if (res)
1093                 return res;
1094
1095         if (fw->size < SAS_STRING_ADDR_SIZE) {
1096                 res = -ENODEV;
1097                 goto out;
1098         }
1099
1100         sas_parse_addr(addr, fw->data);
1101
1102 out:
1103         release_firmware(fw);
1104         return res;
1105 }
1106 EXPORT_SYMBOL_GPL(sas_request_addr);
1107
1108 EXPORT_SYMBOL_GPL(sas_queuecommand);
1109 EXPORT_SYMBOL_GPL(sas_target_alloc);
1110 EXPORT_SYMBOL_GPL(sas_slave_configure);
1111 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1112 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1113 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1114 EXPORT_SYMBOL_GPL(sas_bios_param);
1115 EXPORT_SYMBOL_GPL(__sas_task_abort);
1116 EXPORT_SYMBOL_GPL(sas_task_abort);
1117 EXPORT_SYMBOL_GPL(sas_phy_reset);
1118 EXPORT_SYMBOL_GPL(sas_phy_enable);
1119 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1120 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1121 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1122 EXPORT_SYMBOL_GPL(sas_target_destroy);
1123 EXPORT_SYMBOL_GPL(sas_ioctl);