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);
115 list_del_init(&task->list);
119 static void sas_scsi_task_done(struct sas_task *task)
121 struct scsi_cmnd *sc = task->uldd_task;
122 struct domain_device *dev = task->dev;
123 struct sas_ha_struct *ha = dev->port->ha;
126 spin_lock_irqsave(&dev->done_lock, flags);
127 if (test_bit(SAS_HA_FROZEN, &ha->state))
130 ASSIGN_SAS_TASK(sc, NULL);
131 spin_unlock_irqrestore(&dev->done_lock, flags);
133 if (unlikely(!task)) {
134 /* task will be completed by the error handler */
135 SAS_DPRINTK("task done but aborted\n");
140 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
141 list_del_init(&task->list);
146 sas_end_task(sc, task);
150 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
151 struct domain_device *dev,
154 struct sas_task *task = sas_alloc_task(gfp_flags);
160 task->uldd_task = cmd;
161 ASSIGN_SAS_TASK(cmd, task);
164 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
166 task->ssp_task.retry_count = 1;
167 int_to_scsilun(cmd->device->lun, &lun);
168 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
169 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
170 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
172 task->scatter = scsi_sglist(cmd);
173 task->num_scatter = scsi_sg_count(cmd);
174 task->total_xfer_len = scsi_bufflen(cmd);
175 task->data_dir = cmd->sc_data_direction;
177 task->task_done = sas_scsi_task_done;
182 int sas_queue_up(struct sas_task *task)
184 struct sas_ha_struct *sas_ha = task->dev->port->ha;
185 struct scsi_core *core = &sas_ha->core;
189 spin_lock_irqsave(&core->task_queue_lock, flags);
190 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
191 spin_unlock_irqrestore(&core->task_queue_lock, flags);
192 return -SAS_QUEUE_FULL;
194 list_add_tail(&task->list, &core->task_queue);
195 core->task_queue_size += 1;
196 spin_unlock_irqrestore(&core->task_queue_lock, flags);
197 wake_up_process(core->queue_thread);
202 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
204 struct sas_internal *i = to_sas_internal(host->transportt);
205 struct domain_device *dev = cmd_to_domain_dev(cmd);
206 struct sas_ha_struct *sas_ha = dev->port->ha;
207 struct sas_task *task;
210 /* If the device fell off, no sense in issuing commands */
211 if (test_bit(SAS_DEV_GONE, &dev->state)) {
212 cmd->result = DID_BAD_TARGET << 16;
216 if (dev_is_sata(dev)) {
217 spin_lock_irq(dev->sata_dev.ap->lock);
218 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
219 spin_unlock_irq(dev->sata_dev.ap->lock);
223 task = sas_create_task(cmd, dev, GFP_ATOMIC);
225 return SCSI_MLQUEUE_HOST_BUSY;
227 /* Queue up, Direct Mode or Task Collector Mode. */
228 if (sas_ha->lldd_max_execute_num < 2)
229 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
231 res = sas_queue_up(task);
238 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
239 ASSIGN_SAS_TASK(cmd, NULL);
241 if (res == -SAS_QUEUE_FULL)
242 cmd->result = DID_SOFT_ERROR << 16; /* retry */
244 cmd->result = DID_ERROR << 16;
250 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
252 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
253 struct sas_task *task = TO_SAS_TASK(cmd);
255 /* At this point, we only get called following an actual abort
256 * of the task, so we should be guaranteed not to be racing with
257 * any completions from the LLD. Task is freed after this.
259 sas_end_task(cmd, task);
261 /* now finish the command and move it on to the error
262 * handler done list, this also takes it off the
263 * error handler pending list.
265 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
268 static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
270 struct domain_device *dev = cmd_to_domain_dev(cmd);
271 struct sas_ha_struct *ha = dev->port->ha;
272 struct sas_task *task = TO_SAS_TASK(cmd);
274 if (!dev_is_sata(dev)) {
275 sas_eh_finish_cmd(cmd);
279 /* report the timeout to libata */
280 sas_end_task(cmd, task);
281 list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
284 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
286 struct scsi_cmnd *cmd, *n;
288 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
289 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
290 cmd->device->lun == my_cmd->device->lun)
291 sas_eh_defer_cmd(cmd);
295 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
296 struct domain_device *dev)
298 struct scsi_cmnd *cmd, *n;
300 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
301 struct domain_device *x = cmd_to_domain_dev(cmd);
304 sas_eh_finish_cmd(cmd);
308 static void sas_scsi_clear_queue_port(struct list_head *error_q,
309 struct asd_sas_port *port)
311 struct scsi_cmnd *cmd, *n;
313 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
314 struct domain_device *dev = cmd_to_domain_dev(cmd);
315 struct asd_sas_port *x = dev->port;
318 sas_eh_finish_cmd(cmd);
322 enum task_disposition {
331 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
333 struct sas_ha_struct *ha = task->dev->port->ha;
336 struct sas_internal *si =
337 to_sas_internal(task->dev->port->ha->core.shost->transportt);
339 if (ha->lldd_max_execute_num > 1) {
340 struct scsi_core *core = &ha->core;
341 struct sas_task *t, *n;
343 mutex_lock(&core->task_queue_flush);
344 spin_lock_irqsave(&core->task_queue_lock, flags);
345 list_for_each_entry_safe(t, n, &core->task_queue, list)
347 list_del_init(&t->list);
350 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351 mutex_unlock(&core->task_queue_flush);
354 return TASK_IS_NOT_AT_HA;
357 for (i = 0; i < 5; i++) {
358 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
359 res = si->dft->lldd_abort_task(task);
361 spin_lock_irqsave(&task->task_state_lock, flags);
362 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
363 spin_unlock_irqrestore(&task->task_state_lock, flags);
364 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
368 spin_unlock_irqrestore(&task->task_state_lock, flags);
370 if (res == TMF_RESP_FUNC_COMPLETE) {
371 SAS_DPRINTK("%s: task 0x%p is aborted\n",
373 return TASK_IS_ABORTED;
374 } else if (si->dft->lldd_query_task) {
375 SAS_DPRINTK("%s: querying task 0x%p\n",
377 res = si->dft->lldd_query_task(task);
379 case TMF_RESP_FUNC_SUCC:
380 SAS_DPRINTK("%s: task 0x%p at LU\n",
382 return TASK_IS_AT_LU;
383 case TMF_RESP_FUNC_COMPLETE:
384 SAS_DPRINTK("%s: task 0x%p not at LU\n",
386 return TASK_IS_NOT_AT_LU;
387 case TMF_RESP_FUNC_FAILED:
388 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
390 return TASK_ABORT_FAILED;
398 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
400 int res = TMF_RESP_FUNC_FAILED;
402 struct sas_internal *i =
403 to_sas_internal(dev->port->ha->core.shost->transportt);
405 int_to_scsilun(cmd->device->lun, &lun);
407 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
408 SAS_ADDR(dev->sas_addr),
411 if (i->dft->lldd_abort_task_set)
412 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
414 if (res == TMF_RESP_FUNC_FAILED) {
415 if (i->dft->lldd_clear_task_set)
416 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
419 if (res == TMF_RESP_FUNC_FAILED) {
420 if (i->dft->lldd_lu_reset)
421 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
427 static int sas_recover_I_T(struct domain_device *dev)
429 int res = TMF_RESP_FUNC_FAILED;
430 struct sas_internal *i =
431 to_sas_internal(dev->port->ha->core.shost->transportt);
433 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
434 SAS_ADDR(dev->sas_addr));
436 if (i->dft->lldd_I_T_nexus_reset)
437 res = i->dft->lldd_I_T_nexus_reset(dev);
442 /* take a reference on the last known good phy for this device */
443 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
445 struct sas_ha_struct *ha = dev->port->ha;
449 /* a published domain device always has a valid phy, it may be
450 * stale, but it is never NULL
454 spin_lock_irqsave(&ha->phy_port_lock, flags);
456 get_device(&phy->dev);
457 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
461 EXPORT_SYMBOL_GPL(sas_get_local_phy);
463 /* Attempt to send a LUN reset message to a device */
464 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
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);
472 int_to_scsilun(cmd->device->lun, &lun);
474 if (!i->dft->lldd_lu_reset)
477 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
478 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
484 /* Attempt to send a phy (bus) reset */
485 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
487 struct domain_device *dev = cmd_to_domain_dev(cmd);
488 struct sas_phy *phy = sas_get_local_phy(dev);
491 res = sas_phy_reset(phy, 1);
493 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
494 kobject_name(&phy->dev.kobj),
496 sas_put_local_phy(phy);
498 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
504 /* Try to reset a device */
505 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
508 struct Scsi_Host *shost = cmd->device->host;
510 if (!shost->hostt->eh_device_reset_handler)
513 res = shost->hostt->eh_device_reset_handler(cmd);
518 if (shost->hostt->eh_bus_reset_handler)
519 return shost->hostt->eh_bus_reset_handler(cmd);
524 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
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);
531 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
534 /* clean out any commands that won the completion vs eh race */
535 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
536 struct domain_device *dev = cmd_to_domain_dev(cmd);
537 struct sas_task *task;
539 spin_lock_irqsave(&dev->done_lock, flags);
540 /* by this point the lldd has either observed
541 * SAS_HA_FROZEN and is leaving the task alone, or has
542 * won the race with eh and decided to complete it
544 task = TO_SAS_TASK(cmd);
545 spin_unlock_irqrestore(&dev->done_lock, flags);
548 list_move_tail(&cmd->eh_entry, &done);
552 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
553 struct sas_task *task = TO_SAS_TASK(cmd);
555 list_del_init(&cmd->eh_entry);
557 spin_lock_irqsave(&task->task_state_lock, flags);
558 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
559 spin_unlock_irqrestore(&task->task_state_lock, flags);
562 SAS_DPRINTK("%s: task 0x%p requests reset\n",
567 SAS_DPRINTK("trying to find task 0x%p\n", task);
568 res = sas_scsi_find_task(task);
573 case TASK_IS_NOT_AT_HA:
574 SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
576 cmd->retries ? "retry" : "aborted");
579 sas_eh_finish_cmd(cmd);
582 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
584 sas_eh_defer_cmd(cmd);
586 case TASK_IS_ABORTED:
587 SAS_DPRINTK("%s: task 0x%p is aborted\n",
589 sas_eh_defer_cmd(cmd);
592 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
594 tmf_resp = sas_recover_lu(task->dev, cmd);
595 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
596 SAS_DPRINTK("dev %016llx LU %x is "
600 sas_eh_defer_cmd(cmd);
601 sas_scsi_clear_queue_lu(work_q, cmd);
605 case TASK_IS_NOT_AT_LU:
606 case TASK_ABORT_FAILED:
607 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
609 tmf_resp = sas_recover_I_T(task->dev);
610 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
611 struct domain_device *dev = task->dev;
612 SAS_DPRINTK("I_T %016llx recovered\n",
613 SAS_ADDR(task->dev->sas_addr));
614 sas_eh_finish_cmd(cmd);
615 sas_scsi_clear_queue_I_T(work_q, dev);
618 /* Hammer time :-) */
619 try_to_reset_cmd_device(cmd);
620 if (i->dft->lldd_clear_nexus_port) {
621 struct asd_sas_port *port = task->dev->port;
622 SAS_DPRINTK("clearing nexus for port:%d\n",
624 res = i->dft->lldd_clear_nexus_port(port);
625 if (res == TMF_RESP_FUNC_COMPLETE) {
626 SAS_DPRINTK("clear nexus port:%d "
627 "succeeded\n", port->id);
628 sas_eh_finish_cmd(cmd);
629 sas_scsi_clear_queue_port(work_q,
634 if (i->dft->lldd_clear_nexus_ha) {
635 SAS_DPRINTK("clear nexus ha\n");
636 res = i->dft->lldd_clear_nexus_ha(ha);
637 if (res == TMF_RESP_FUNC_COMPLETE) {
638 SAS_DPRINTK("clear nexus ha "
640 sas_eh_finish_cmd(cmd);
644 /* If we are here -- this means that no amount
645 * of effort could recover from errors. Quite
646 * possibly the HA just disappeared.
648 SAS_DPRINTK("error from device %llx, LUN %x "
649 "couldn't be recovered in any way\n",
650 SAS_ADDR(task->dev->sas_addr),
653 sas_eh_finish_cmd(cmd);
658 list_splice_tail(&done, work_q);
659 list_splice_tail_init(&ha->eh_ata_q, work_q);
663 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
664 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
665 sas_eh_finish_cmd(cmd);
669 void sas_scsi_recover_host(struct Scsi_Host *shost)
671 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
673 LIST_HEAD(eh_work_q);
675 spin_lock_irqsave(shost->host_lock, flags);
676 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
677 shost->host_eh_scheduled = 0;
678 spin_unlock_irqrestore(shost->host_lock, flags);
680 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
681 __func__, shost->host_busy, shost->host_failed);
683 * Deal with commands that still have SAS tasks (i.e. they didn't
684 * complete via the normal sas_task completion mechanism),
685 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
687 set_bit(SAS_HA_FROZEN, &ha->state);
688 sas_eh_handle_sas_errors(shost, &eh_work_q);
689 clear_bit(SAS_HA_FROZEN, &ha->state);
690 if (list_empty(&eh_work_q))
694 * Now deal with SCSI commands that completed ok but have a an error
695 * code (and hopefully sense data) attached. This is roughly what
696 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
697 * command we see here has no sas_task and is thus unknown to the HA.
699 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
700 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
701 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
704 if (ha->lldd_max_execute_num > 1)
705 wake_up_process(ha->core.queue_thread);
707 /* now link into libata eh --- if we have any ata devices */
708 sas_ata_strategy_handler(shost);
710 scsi_eh_flush_done_q(&ha->eh_done_q);
712 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d\n",
713 __func__, shost->host_busy, shost->host_failed);
716 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
718 scmd_printk(KERN_DEBUG, cmd, "command %p timed out\n", cmd);
720 return BLK_EH_NOT_HANDLED;
723 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
725 struct domain_device *dev = sdev_to_domain_dev(sdev);
727 if (dev_is_sata(dev))
728 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
733 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
735 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
736 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
737 struct domain_device *found_dev = NULL;
741 spin_lock_irqsave(&ha->phy_port_lock, flags);
742 for (i = 0; i < ha->num_phys; i++) {
743 struct asd_sas_port *port = ha->sas_port[i];
744 struct domain_device *dev;
746 spin_lock(&port->dev_list_lock);
747 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
748 if (rphy == dev->rphy) {
750 spin_unlock(&port->dev_list_lock);
754 spin_unlock(&port->dev_list_lock);
757 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
762 int sas_target_alloc(struct scsi_target *starget)
764 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
765 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
770 kref_get(&found_dev->kref);
771 starget->hostdata = found_dev;
775 #define SAS_DEF_QD 256
777 int sas_slave_configure(struct scsi_device *scsi_dev)
779 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
780 struct sas_ha_struct *sas_ha;
782 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
784 if (dev_is_sata(dev)) {
785 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
789 sas_ha = dev->port->ha;
791 sas_read_port_mode_page(scsi_dev);
793 if (scsi_dev->tagged_supported) {
794 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
795 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
797 SAS_DPRINTK("device %llx, LUN %x doesn't support "
798 "TCQ\n", SAS_ADDR(dev->sas_addr),
800 scsi_dev->tagged_supported = 0;
801 scsi_set_tag_type(scsi_dev, 0);
802 scsi_deactivate_tcq(scsi_dev, 1);
805 scsi_dev->allow_restart = 1;
810 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
812 struct domain_device *dev = sdev_to_domain_dev(sdev);
814 if (dev_is_sata(dev))
815 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
819 case SCSI_QDEPTH_DEFAULT:
820 case SCSI_QDEPTH_RAMP_UP:
821 if (!sdev->tagged_supported)
823 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
825 case SCSI_QDEPTH_QFULL:
826 scsi_track_queue_full(sdev, depth);
835 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
837 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
839 if (dev_is_sata(dev))
842 if (!scsi_dev->tagged_supported)
845 scsi_deactivate_tcq(scsi_dev, 1);
847 scsi_set_tag_type(scsi_dev, qt);
848 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
853 int sas_bios_param(struct scsi_device *scsi_dev,
854 struct block_device *bdev,
855 sector_t capacity, int *hsc)
859 sector_div(capacity, 255*63);
865 /* ---------- Task Collector Thread implementation ---------- */
867 static void sas_queue(struct sas_ha_struct *sas_ha)
869 struct scsi_core *core = &sas_ha->core;
874 struct sas_internal *i = to_sas_internal(core->shost->transportt);
876 mutex_lock(&core->task_queue_flush);
877 spin_lock_irqsave(&core->task_queue_lock, flags);
878 while (!kthread_should_stop() &&
879 !list_empty(&core->task_queue) &&
880 !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
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);
887 struct list_head *a, *n;
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)
895 can_queue = sas_ha->lldd_queue_size;
897 core->task_queue_size -= can_queue;
898 spin_unlock_irqrestore(&core->task_queue_lock, flags);
900 struct sas_task *task = list_entry(q.next,
904 res = i->dft->lldd_execute_task(task, can_queue,
907 __list_add(&q, task->list.prev, &task->list);
909 spin_lock_irqsave(&core->task_queue_lock, flags);
911 list_splice_init(&q, &core->task_queue); /*at head*/
912 core->task_queue_size += can_queue;
915 spin_unlock_irqrestore(&core->task_queue_lock, flags);
916 mutex_unlock(&core->task_queue_flush);
920 * sas_queue_thread -- The Task Collector thread
921 * @_sas_ha: pointer to struct sas_ha
923 static int sas_queue_thread(void *_sas_ha)
925 struct sas_ha_struct *sas_ha = _sas_ha;
928 set_current_state(TASK_INTERRUPTIBLE);
931 if (kthread_should_stop())
938 int sas_init_queue(struct sas_ha_struct *sas_ha)
940 struct scsi_core *core = &sas_ha->core;
942 spin_lock_init(&core->task_queue_lock);
943 mutex_init(&core->task_queue_flush);
944 core->task_queue_size = 0;
945 INIT_LIST_HEAD(&core->task_queue);
947 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
948 "sas_queue_%d", core->shost->host_no);
949 if (IS_ERR(core->queue_thread))
950 return PTR_ERR(core->queue_thread);
954 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
957 struct scsi_core *core = &sas_ha->core;
958 struct sas_task *task, *n;
960 kthread_stop(core->queue_thread);
962 if (!list_empty(&core->task_queue))
963 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
964 SAS_ADDR(sas_ha->sas_addr));
966 spin_lock_irqsave(&core->task_queue_lock, flags);
967 list_for_each_entry_safe(task, n, &core->task_queue, list) {
968 struct scsi_cmnd *cmd = task->uldd_task;
970 list_del_init(&task->list);
972 ASSIGN_SAS_TASK(cmd, NULL);
974 cmd->result = DID_ABORT << 16;
977 spin_unlock_irqrestore(&core->task_queue_lock, flags);
981 * Tell an upper layer that it needs to initiate an abort for a given task.
982 * This should only ever be called by an LLDD.
984 void sas_task_abort(struct sas_task *task)
986 struct scsi_cmnd *sc = task->uldd_task;
988 /* Escape for libsas internal commands */
990 if (!del_timer(&task->timer))
992 task->timer.function(task->timer.data);
996 if (dev_is_sata(task->dev)) {
997 sas_ata_task_abort(task);
999 struct request_queue *q = sc->device->request_queue;
1000 unsigned long flags;
1002 spin_lock_irqsave(q->queue_lock, flags);
1003 blk_abort_request(sc->request);
1004 spin_unlock_irqrestore(q->queue_lock, flags);
1005 scsi_schedule_eh(sc->device->host);
1009 void sas_target_destroy(struct scsi_target *starget)
1011 struct domain_device *found_dev = starget->hostdata;
1016 starget->hostdata = NULL;
1017 sas_put_device(found_dev);
1020 static void sas_parse_addr(u8 *sas_addr, const char *p)
1023 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1027 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1029 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1031 sas_addr[i] = (h<<4) | l;
1035 #define SAS_STRING_ADDR_SIZE 16
1037 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1040 const struct firmware *fw;
1042 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1046 if (fw->size < SAS_STRING_ADDR_SIZE) {
1051 sas_parse_addr(addr, fw->data);
1054 release_firmware(fw);
1057 EXPORT_SYMBOL_GPL(sas_request_addr);
1059 EXPORT_SYMBOL_GPL(sas_queuecommand);
1060 EXPORT_SYMBOL_GPL(sas_target_alloc);
1061 EXPORT_SYMBOL_GPL(sas_slave_configure);
1062 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1063 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1064 EXPORT_SYMBOL_GPL(sas_bios_param);
1065 EXPORT_SYMBOL_GPL(sas_task_abort);
1066 EXPORT_SYMBOL_GPL(sas_phy_reset);
1067 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1068 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1069 EXPORT_SYMBOL_GPL(sas_target_destroy);
1070 EXPORT_SYMBOL_GPL(sas_ioctl);