2 * Serial Attached SCSI (SAS) class SCSI Host glue.
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 * This file is licensed under GPLv2.
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.
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.
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
26 #include <linux/kthread.h>
27 #include <linux/firmware.h>
28 #include <linux/export.h>
29 #include <linux/ctype.h>
31 #include "sas_internal.h"
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_eh.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_sas.h>
40 #include <scsi/sas_ata.h>
41 #include "../scsi_sas_internal.h"
42 #include "../scsi_transport_api.h"
43 #include "../scsi_priv.h"
45 #include <linux/err.h>
46 #include <linux/blkdev.h>
47 #include <linux/freezer.h>
48 #include <linux/gfp.h>
49 #include <linux/scatterlist.h>
50 #include <linux/libata.h>
52 /* record final status and free the task */
53 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
55 struct task_status_struct *ts = &task->task_status;
58 if (ts->resp == SAS_TASK_UNDELIVERED) {
61 } else { /* ts->resp == SAS_TASK_COMPLETE */
62 /* task delivered, what happened afterwards? */
64 case SAS_DEV_NO_RESPONSE:
71 case SAS_DATA_UNDERRUN:
72 scsi_set_resid(sc, ts->residual);
73 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
76 case SAS_DATA_OVERRUN:
80 hs = DID_SOFT_ERROR; /* retry */
82 case SAS_DEVICE_UNKNOWN:
89 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
90 hs = DID_SOFT_ERROR; /* retry */
94 case SAS_PROTO_RESPONSE:
95 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
96 "task; please report this\n",
97 task->dev->port->ha->sas_ha_name);
99 case SAS_ABORTED_TASK:
102 case SAM_STAT_CHECK_CONDITION:
103 memcpy(sc->sense_buffer, ts->buf,
104 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
105 stat = SAM_STAT_CHECK_CONDITION;
113 sc->result = (hs << 16) | stat;
114 ASSIGN_SAS_TASK(sc, NULL);
118 static void sas_scsi_task_done(struct sas_task *task)
120 struct scsi_cmnd *sc = task->uldd_task;
121 struct domain_device *dev = task->dev;
122 struct sas_ha_struct *ha = dev->port->ha;
125 spin_lock_irqsave(&dev->done_lock, flags);
126 if (test_bit(SAS_HA_FROZEN, &ha->state))
129 ASSIGN_SAS_TASK(sc, NULL);
130 spin_unlock_irqrestore(&dev->done_lock, flags);
132 if (unlikely(!task)) {
133 /* task will be completed by the error handler */
134 SAS_DPRINTK("task done but aborted\n");
139 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
144 sas_end_task(sc, task);
148 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
149 struct domain_device *dev,
152 struct sas_task *task = sas_alloc_task(gfp_flags);
158 task->uldd_task = cmd;
159 ASSIGN_SAS_TASK(cmd, task);
162 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
164 task->ssp_task.retry_count = 1;
165 int_to_scsilun(cmd->device->lun, &lun);
166 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
167 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
168 task->ssp_task.cmd = cmd;
170 task->scatter = scsi_sglist(cmd);
171 task->num_scatter = scsi_sg_count(cmd);
172 task->total_xfer_len = scsi_bufflen(cmd);
173 task->data_dir = cmd->sc_data_direction;
175 task->task_done = sas_scsi_task_done;
180 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
182 struct sas_internal *i = to_sas_internal(host->transportt);
183 struct domain_device *dev = cmd_to_domain_dev(cmd);
184 struct sas_task *task;
187 /* If the device fell off, no sense in issuing commands */
188 if (test_bit(SAS_DEV_GONE, &dev->state)) {
189 cmd->result = DID_BAD_TARGET << 16;
193 if (dev_is_sata(dev)) {
194 spin_lock_irq(dev->sata_dev.ap->lock);
195 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
196 spin_unlock_irq(dev->sata_dev.ap->lock);
200 task = sas_create_task(cmd, dev, GFP_ATOMIC);
202 return SCSI_MLQUEUE_HOST_BUSY;
204 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
210 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
211 ASSIGN_SAS_TASK(cmd, NULL);
213 if (res == -SAS_QUEUE_FULL)
214 cmd->result = DID_SOFT_ERROR << 16; /* retry */
216 cmd->result = DID_ERROR << 16;
222 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
224 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
225 struct domain_device *dev = cmd_to_domain_dev(cmd);
226 struct sas_task *task = TO_SAS_TASK(cmd);
228 /* At this point, we only get called following an actual abort
229 * of the task, so we should be guaranteed not to be racing with
230 * any completions from the LLD. Task is freed after this.
232 sas_end_task(cmd, task);
234 if (dev_is_sata(dev)) {
235 /* defer commands to libata so that libata EH can
236 * handle ata qcs correctly
238 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
242 /* now finish the command and move it on to the error
243 * handler done list, this also takes it off the
244 * error handler pending list.
246 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
249 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
251 struct scsi_cmnd *cmd, *n;
253 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
254 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
255 cmd->device->lun == my_cmd->device->lun)
256 sas_eh_finish_cmd(cmd);
260 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
261 struct domain_device *dev)
263 struct scsi_cmnd *cmd, *n;
265 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
266 struct domain_device *x = cmd_to_domain_dev(cmd);
269 sas_eh_finish_cmd(cmd);
273 static void sas_scsi_clear_queue_port(struct list_head *error_q,
274 struct asd_sas_port *port)
276 struct scsi_cmnd *cmd, *n;
278 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
279 struct domain_device *dev = cmd_to_domain_dev(cmd);
280 struct asd_sas_port *x = dev->port;
283 sas_eh_finish_cmd(cmd);
287 enum task_disposition {
295 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
299 struct sas_internal *si =
300 to_sas_internal(task->dev->port->ha->core.shost->transportt);
302 for (i = 0; i < 5; i++) {
303 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
304 res = si->dft->lldd_abort_task(task);
306 spin_lock_irqsave(&task->task_state_lock, flags);
307 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
308 spin_unlock_irqrestore(&task->task_state_lock, flags);
309 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
313 spin_unlock_irqrestore(&task->task_state_lock, flags);
315 if (res == TMF_RESP_FUNC_COMPLETE) {
316 SAS_DPRINTK("%s: task 0x%p is aborted\n",
318 return TASK_IS_ABORTED;
319 } else if (si->dft->lldd_query_task) {
320 SAS_DPRINTK("%s: querying task 0x%p\n",
322 res = si->dft->lldd_query_task(task);
324 case TMF_RESP_FUNC_SUCC:
325 SAS_DPRINTK("%s: task 0x%p at LU\n",
327 return TASK_IS_AT_LU;
328 case TMF_RESP_FUNC_COMPLETE:
329 SAS_DPRINTK("%s: task 0x%p not at LU\n",
331 return TASK_IS_NOT_AT_LU;
332 case TMF_RESP_FUNC_FAILED:
333 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
335 return TASK_ABORT_FAILED;
343 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
345 int res = TMF_RESP_FUNC_FAILED;
347 struct sas_internal *i =
348 to_sas_internal(dev->port->ha->core.shost->transportt);
350 int_to_scsilun(cmd->device->lun, &lun);
352 SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
353 SAS_ADDR(dev->sas_addr),
356 if (i->dft->lldd_abort_task_set)
357 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
359 if (res == TMF_RESP_FUNC_FAILED) {
360 if (i->dft->lldd_clear_task_set)
361 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
364 if (res == TMF_RESP_FUNC_FAILED) {
365 if (i->dft->lldd_lu_reset)
366 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
372 static int sas_recover_I_T(struct domain_device *dev)
374 int res = TMF_RESP_FUNC_FAILED;
375 struct sas_internal *i =
376 to_sas_internal(dev->port->ha->core.shost->transportt);
378 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
379 SAS_ADDR(dev->sas_addr));
381 if (i->dft->lldd_I_T_nexus_reset)
382 res = i->dft->lldd_I_T_nexus_reset(dev);
387 /* take a reference on the last known good phy for this device */
388 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
390 struct sas_ha_struct *ha = dev->port->ha;
394 /* a published domain device always has a valid phy, it may be
395 * stale, but it is never NULL
399 spin_lock_irqsave(&ha->phy_port_lock, flags);
401 get_device(&phy->dev);
402 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
406 EXPORT_SYMBOL_GPL(sas_get_local_phy);
408 static void sas_wait_eh(struct domain_device *dev)
410 struct sas_ha_struct *ha = dev->port->ha;
413 if (dev_is_sata(dev)) {
414 ata_port_wait_eh(dev->sata_dev.ap);
418 spin_lock_irq(&ha->lock);
420 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
421 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
422 spin_unlock_irq(&ha->lock);
424 spin_lock_irq(&ha->lock);
426 finish_wait(&ha->eh_wait_q, &wait);
428 spin_unlock_irq(&ha->lock);
430 /* make sure SCSI EH is complete */
431 if (scsi_host_in_recovery(ha->core.shost)) {
436 EXPORT_SYMBOL(sas_wait_eh);
438 static int sas_queue_reset(struct domain_device *dev, int reset_type,
441 struct sas_ha_struct *ha = dev->port->ha;
442 int scheduled = 0, tries = 100;
444 /* ata: promote lun reset to bus reset */
445 if (dev_is_sata(dev)) {
446 sas_ata_schedule_reset(dev);
448 sas_ata_wait_eh(dev);
452 while (!scheduled && tries--) {
453 spin_lock_irq(&ha->lock);
454 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
455 !test_bit(reset_type, &dev->state)) {
458 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
459 set_bit(SAS_DEV_EH_PENDING, &dev->state);
460 set_bit(reset_type, &dev->state);
461 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
462 scsi_schedule_eh(ha->core.shost);
464 spin_unlock_irq(&ha->lock);
473 SAS_DPRINTK("%s reset of %s failed\n",
474 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
475 dev_name(&dev->rphy->dev));
480 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
482 int res = TMF_RESP_FUNC_FAILED;
483 struct sas_task *task = TO_SAS_TASK(cmd);
484 struct Scsi_Host *host = cmd->device->host;
485 struct domain_device *dev = cmd_to_domain_dev(cmd);
486 struct sas_internal *i = to_sas_internal(host->transportt);
489 if (!i->dft->lldd_abort_task)
492 spin_lock_irqsave(host->host_lock, flags);
493 /* We cannot do async aborts for SATA devices */
494 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
495 spin_unlock_irqrestore(host->host_lock, flags);
498 spin_unlock_irqrestore(host->host_lock, flags);
501 res = i->dft->lldd_abort_task(task);
503 SAS_DPRINTK("no task to abort\n");
504 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
509 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
511 /* Attempt to send a LUN reset message to a device */
512 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
516 struct Scsi_Host *host = cmd->device->host;
517 struct domain_device *dev = cmd_to_domain_dev(cmd);
518 struct sas_internal *i = to_sas_internal(host->transportt);
520 if (current != host->ehandler)
521 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
523 int_to_scsilun(cmd->device->lun, &lun);
525 if (!i->dft->lldd_lu_reset)
528 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
529 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
535 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
538 struct Scsi_Host *host = cmd->device->host;
539 struct domain_device *dev = cmd_to_domain_dev(cmd);
540 struct sas_internal *i = to_sas_internal(host->transportt);
542 if (current != host->ehandler)
543 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
545 if (!i->dft->lldd_I_T_nexus_reset)
548 res = i->dft->lldd_I_T_nexus_reset(dev);
549 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
556 /* Try to reset a device */
557 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
560 struct Scsi_Host *shost = cmd->device->host;
562 if (!shost->hostt->eh_device_reset_handler)
563 goto try_target_reset;
565 res = shost->hostt->eh_device_reset_handler(cmd);
570 if (shost->hostt->eh_target_reset_handler)
571 return shost->hostt->eh_target_reset_handler(cmd);
576 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
578 struct scsi_cmnd *cmd, *n;
579 enum task_disposition res = TASK_IS_DONE;
580 int tmf_resp, need_reset;
581 struct sas_internal *i = to_sas_internal(shost->transportt);
583 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
586 /* clean out any commands that won the completion vs eh race */
587 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
588 struct domain_device *dev = cmd_to_domain_dev(cmd);
589 struct sas_task *task;
591 spin_lock_irqsave(&dev->done_lock, flags);
592 /* by this point the lldd has either observed
593 * SAS_HA_FROZEN and is leaving the task alone, or has
594 * won the race with eh and decided to complete it
596 task = TO_SAS_TASK(cmd);
597 spin_unlock_irqrestore(&dev->done_lock, flags);
600 list_move_tail(&cmd->eh_entry, &done);
604 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
605 struct sas_task *task = TO_SAS_TASK(cmd);
607 list_del_init(&cmd->eh_entry);
609 spin_lock_irqsave(&task->task_state_lock, flags);
610 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
611 spin_unlock_irqrestore(&task->task_state_lock, flags);
614 SAS_DPRINTK("%s: task 0x%p requests reset\n",
619 SAS_DPRINTK("trying to find task 0x%p\n", task);
620 res = sas_scsi_find_task(task);
624 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
626 sas_eh_finish_cmd(cmd);
628 case TASK_IS_ABORTED:
629 SAS_DPRINTK("%s: task 0x%p is aborted\n",
631 sas_eh_finish_cmd(cmd);
634 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
636 tmf_resp = sas_recover_lu(task->dev, cmd);
637 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
638 SAS_DPRINTK("dev %016llx LU %llx is "
642 sas_eh_finish_cmd(cmd);
643 sas_scsi_clear_queue_lu(work_q, cmd);
647 case TASK_IS_NOT_AT_LU:
648 case TASK_ABORT_FAILED:
649 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
651 tmf_resp = sas_recover_I_T(task->dev);
652 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
653 tmf_resp == -ENODEV) {
654 struct domain_device *dev = task->dev;
655 SAS_DPRINTK("I_T %016llx recovered\n",
656 SAS_ADDR(task->dev->sas_addr));
657 sas_eh_finish_cmd(cmd);
658 sas_scsi_clear_queue_I_T(work_q, dev);
661 /* Hammer time :-) */
662 try_to_reset_cmd_device(cmd);
663 if (i->dft->lldd_clear_nexus_port) {
664 struct asd_sas_port *port = task->dev->port;
665 SAS_DPRINTK("clearing nexus for port:%d\n",
667 res = i->dft->lldd_clear_nexus_port(port);
668 if (res == TMF_RESP_FUNC_COMPLETE) {
669 SAS_DPRINTK("clear nexus port:%d "
670 "succeeded\n", port->id);
671 sas_eh_finish_cmd(cmd);
672 sas_scsi_clear_queue_port(work_q,
677 if (i->dft->lldd_clear_nexus_ha) {
678 SAS_DPRINTK("clear nexus ha\n");
679 res = i->dft->lldd_clear_nexus_ha(ha);
680 if (res == TMF_RESP_FUNC_COMPLETE) {
681 SAS_DPRINTK("clear nexus ha "
683 sas_eh_finish_cmd(cmd);
687 /* If we are here -- this means that no amount
688 * of effort could recover from errors. Quite
689 * possibly the HA just disappeared.
691 SAS_DPRINTK("error from device %llx, LUN %llx "
692 "couldn't be recovered in any way\n",
693 SAS_ADDR(task->dev->sas_addr),
696 sas_eh_finish_cmd(cmd);
701 list_splice_tail(&done, work_q);
702 list_splice_tail_init(&ha->eh_ata_q, work_q);
706 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
707 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
708 sas_eh_finish_cmd(cmd);
712 static void sas_eh_handle_resets(struct Scsi_Host *shost)
714 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
715 struct sas_internal *i = to_sas_internal(shost->transportt);
717 /* handle directed resets to sas devices */
718 spin_lock_irq(&ha->lock);
719 while (!list_empty(&ha->eh_dev_q)) {
720 struct domain_device *dev;
721 struct ssp_device *ssp;
723 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
724 list_del_init(&ssp->eh_list_node);
725 dev = container_of(ssp, typeof(*dev), ssp_dev);
726 kref_get(&dev->kref);
727 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
729 spin_unlock_irq(&ha->lock);
731 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
732 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
734 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
735 i->dft->lldd_I_T_nexus_reset(dev);
738 spin_lock_irq(&ha->lock);
739 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
742 spin_unlock_irq(&ha->lock);
746 void sas_scsi_recover_host(struct Scsi_Host *shost)
748 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
749 LIST_HEAD(eh_work_q);
756 spin_lock_irq(shost->host_lock);
757 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
758 spin_unlock_irq(shost->host_lock);
760 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
761 __func__, atomic_read(&shost->host_busy), shost->host_failed);
763 * Deal with commands that still have SAS tasks (i.e. they didn't
764 * complete via the normal sas_task completion mechanism),
765 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
767 set_bit(SAS_HA_FROZEN, &ha->state);
768 sas_eh_handle_sas_errors(shost, &eh_work_q);
769 clear_bit(SAS_HA_FROZEN, &ha->state);
770 if (list_empty(&eh_work_q))
774 * Now deal with SCSI commands that completed ok but have a an error
775 * code (and hopefully sense data) attached. This is roughly what
776 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
777 * command we see here has no sas_task and is thus unknown to the HA.
779 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
780 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
781 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
784 sas_eh_handle_resets(shost);
786 /* now link into libata eh --- if we have any ata devices */
787 sas_ata_strategy_handler(shost);
789 scsi_eh_flush_done_q(&ha->eh_done_q);
791 /* check if any new eh work was scheduled during the last run */
792 spin_lock_irq(&ha->lock);
793 if (ha->eh_active == 0) {
794 shost->host_eh_scheduled = 0;
797 spin_unlock_irq(&ha->lock);
802 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
803 __func__, atomic_read(&shost->host_busy),
804 shost->host_failed, tries);
807 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
809 struct domain_device *dev = sdev_to_domain_dev(sdev);
811 if (dev_is_sata(dev))
812 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
817 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
819 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
820 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
821 struct domain_device *found_dev = NULL;
825 spin_lock_irqsave(&ha->phy_port_lock, flags);
826 for (i = 0; i < ha->num_phys; i++) {
827 struct asd_sas_port *port = ha->sas_port[i];
828 struct domain_device *dev;
830 spin_lock(&port->dev_list_lock);
831 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
832 if (rphy == dev->rphy) {
834 spin_unlock(&port->dev_list_lock);
838 spin_unlock(&port->dev_list_lock);
841 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
846 int sas_target_alloc(struct scsi_target *starget)
848 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
849 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
854 kref_get(&found_dev->kref);
855 starget->hostdata = found_dev;
859 #define SAS_DEF_QD 256
861 int sas_slave_configure(struct scsi_device *scsi_dev)
863 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
865 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
867 if (dev_is_sata(dev)) {
868 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
872 sas_read_port_mode_page(scsi_dev);
874 if (scsi_dev->tagged_supported) {
875 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
877 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
878 "TCQ\n", SAS_ADDR(dev->sas_addr),
880 scsi_change_queue_depth(scsi_dev, 1);
883 scsi_dev->allow_restart = 1;
888 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
890 struct domain_device *dev = sdev_to_domain_dev(sdev);
892 if (dev_is_sata(dev))
893 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
895 if (!sdev->tagged_supported)
897 return scsi_change_queue_depth(sdev, depth);
900 int sas_bios_param(struct scsi_device *scsi_dev,
901 struct block_device *bdev,
902 sector_t capacity, int *hsc)
906 sector_div(capacity, 255*63);
913 * Tell an upper layer that it needs to initiate an abort for a given task.
914 * This should only ever be called by an LLDD.
916 void sas_task_abort(struct sas_task *task)
918 struct scsi_cmnd *sc = task->uldd_task;
920 /* Escape for libsas internal commands */
922 struct sas_task_slow *slow = task->slow_task;
926 if (!del_timer(&slow->timer))
928 slow->timer.function(slow->timer.data);
932 if (dev_is_sata(task->dev)) {
933 sas_ata_task_abort(task);
935 struct request_queue *q = sc->device->request_queue;
938 spin_lock_irqsave(q->queue_lock, flags);
939 blk_abort_request(sc->request);
940 spin_unlock_irqrestore(q->queue_lock, flags);
944 void sas_target_destroy(struct scsi_target *starget)
946 struct domain_device *found_dev = starget->hostdata;
951 starget->hostdata = NULL;
952 sas_put_device(found_dev);
955 static void sas_parse_addr(u8 *sas_addr, const char *p)
958 for (i = 0; i < SAS_ADDR_SIZE; i++) {
962 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
964 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
966 sas_addr[i] = (h<<4) | l;
970 #define SAS_STRING_ADDR_SIZE 16
972 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
975 const struct firmware *fw;
977 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
981 if (fw->size < SAS_STRING_ADDR_SIZE) {
986 sas_parse_addr(addr, fw->data);
989 release_firmware(fw);
992 EXPORT_SYMBOL_GPL(sas_request_addr);
994 EXPORT_SYMBOL_GPL(sas_queuecommand);
995 EXPORT_SYMBOL_GPL(sas_target_alloc);
996 EXPORT_SYMBOL_GPL(sas_slave_configure);
997 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
998 EXPORT_SYMBOL_GPL(sas_bios_param);
999 EXPORT_SYMBOL_GPL(sas_task_abort);
1000 EXPORT_SYMBOL_GPL(sas_phy_reset);
1001 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1002 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
1003 EXPORT_SYMBOL_GPL(sas_target_destroy);
1004 EXPORT_SYMBOL_GPL(sas_ioctl);