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>
28 #include "sas_internal.h"
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_sas.h>
37 #include <scsi/sas_ata.h>
38 #include "../scsi_sas_internal.h"
39 #include "../scsi_transport_api.h"
40 #include "../scsi_priv.h"
42 #include <linux/err.h>
43 #include <linux/blkdev.h>
44 #include <linux/freezer.h>
45 #include <linux/scatterlist.h>
46 #include <linux/libata.h>
48 /* ---------- SCSI Host glue ---------- */
50 static void sas_scsi_task_done(struct sas_task *task)
52 struct task_status_struct *ts = &task->task_status;
53 struct scsi_cmnd *sc = task->uldd_task;
56 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
57 /* Aborted tasks will be completed by the error handler */
58 SAS_DPRINTK("task done but aborted\n");
63 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
64 list_del_init(&task->list);
69 if (ts->resp == SAS_TASK_UNDELIVERED) {
72 } else { /* ts->resp == SAS_TASK_COMPLETE */
73 /* task delivered, what happened afterwards? */
75 case SAS_DEV_NO_RESPONSE:
82 case SAS_DATA_UNDERRUN:
83 scsi_set_resid(sc, ts->residual);
84 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
87 case SAS_DATA_OVERRUN:
91 hs = DID_SOFT_ERROR; /* retry */
93 case SAS_DEVICE_UNKNOWN:
100 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
101 hs = DID_SOFT_ERROR; /* retry */
105 case SAS_PROTO_RESPONSE:
106 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
107 "task; please report this\n",
108 task->dev->port->ha->sas_ha_name);
110 case SAS_ABORTED_TASK:
114 memcpy(sc->sense_buffer, ts->buf,
115 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
116 stat = SAM_CHECK_COND;
123 ASSIGN_SAS_TASK(sc, NULL);
124 sc->result = (hs << 16) | stat;
125 list_del_init(&task->list);
130 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
132 enum task_attribute ta = TASK_ATTR_SIMPLE;
133 if (cmd->request && blk_rq_tagged(cmd->request)) {
134 if (cmd->device->ordered_tags &&
135 (cmd->request->cmd_flags & REQ_HARDBARRIER))
136 ta = TASK_ATTR_ORDERED;
141 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
142 struct domain_device *dev,
145 struct sas_task *task = sas_alloc_task(gfp_flags);
151 task->uldd_task = cmd;
152 ASSIGN_SAS_TASK(cmd, task);
155 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
157 task->ssp_task.retry_count = 1;
158 int_to_scsilun(cmd->device->lun, &lun);
159 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
160 task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
161 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
163 task->scatter = scsi_sglist(cmd);
164 task->num_scatter = scsi_sg_count(cmd);
165 task->total_xfer_len = scsi_bufflen(cmd);
166 task->data_dir = cmd->sc_data_direction;
168 task->task_done = sas_scsi_task_done;
173 int sas_queue_up(struct sas_task *task)
175 struct sas_ha_struct *sas_ha = task->dev->port->ha;
176 struct scsi_core *core = &sas_ha->core;
180 spin_lock_irqsave(&core->task_queue_lock, flags);
181 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
182 spin_unlock_irqrestore(&core->task_queue_lock, flags);
183 return -SAS_QUEUE_FULL;
185 list_add_tail(&task->list, &core->task_queue);
186 core->task_queue_size += 1;
187 spin_unlock_irqrestore(&core->task_queue_lock, flags);
188 wake_up_process(core->queue_thread);
194 * sas_queuecommand -- Enqueue a command for processing
195 * @parameters: See SCSI Core documentation
197 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
198 * call us without holding an IRQ spinlock...
200 int sas_queuecommand(struct scsi_cmnd *cmd,
201 void (*scsi_done)(struct scsi_cmnd *))
202 __releases(host->host_lock)
203 __acquires(dev->sata_dev.ap->lock)
204 __releases(dev->sata_dev.ap->lock)
205 __acquires(host->host_lock)
208 struct domain_device *dev = cmd_to_domain_dev(cmd);
209 struct Scsi_Host *host = cmd->device->host;
210 struct sas_internal *i = to_sas_internal(host->transportt);
212 spin_unlock_irq(host->host_lock);
215 struct sas_ha_struct *sas_ha = dev->port->ha;
216 struct sas_task *task;
218 if (dev_is_sata(dev)) {
221 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
222 res = ata_sas_queuecmd(cmd, scsi_done,
224 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
229 task = sas_create_task(cmd, dev, GFP_ATOMIC);
233 cmd->scsi_done = scsi_done;
234 /* Queue up, Direct Mode or Task Collector Mode. */
235 if (sas_ha->lldd_max_execute_num < 2)
236 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
238 res = sas_queue_up(task);
242 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
243 ASSIGN_SAS_TASK(cmd, NULL);
245 if (res == -SAS_QUEUE_FULL) {
246 cmd->result = DID_SOFT_ERROR << 16; /* retry */
254 spin_lock_irq(host->host_lock);
258 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
260 struct sas_task *task = TO_SAS_TASK(cmd);
261 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
263 /* remove the aborted task flag to allow the task to be
264 * completed now. At this point, we only get called following
265 * an actual abort of the task, so we should be guaranteed not
266 * to be racing with any completions from the LLD (hence we
267 * don't need the task state lock to clear the flag) */
268 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
269 /* Now call task_done. However, task will be free'd after
271 task->task_done(task);
272 /* now finish the command and move it on to the error
273 * handler done list, this also takes it off the
274 * error handler pending list */
275 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
278 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
280 struct scsi_cmnd *cmd, *n;
282 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
283 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
284 cmd->device->lun == my_cmd->device->lun)
285 sas_eh_finish_cmd(cmd);
289 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
290 struct domain_device *dev)
292 struct scsi_cmnd *cmd, *n;
294 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
295 struct domain_device *x = cmd_to_domain_dev(cmd);
298 sas_eh_finish_cmd(cmd);
302 static void sas_scsi_clear_queue_port(struct list_head *error_q,
303 struct asd_sas_port *port)
305 struct scsi_cmnd *cmd, *n;
307 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
308 struct domain_device *dev = cmd_to_domain_dev(cmd);
309 struct asd_sas_port *x = dev->port;
312 sas_eh_finish_cmd(cmd);
316 enum task_disposition {
324 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
326 struct sas_ha_struct *ha = task->dev->port->ha;
329 struct sas_internal *si =
330 to_sas_internal(task->dev->port->ha->core.shost->transportt);
332 if (ha->lldd_max_execute_num > 1) {
333 struct scsi_core *core = &ha->core;
334 struct sas_task *t, *n;
336 spin_lock_irqsave(&core->task_queue_lock, flags);
337 list_for_each_entry_safe(t, n, &core->task_queue, list) {
339 list_del_init(&t->list);
340 spin_unlock_irqrestore(&core->task_queue_lock,
342 SAS_DPRINTK("%s: task 0x%p aborted from "
345 return TASK_IS_ABORTED;
348 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351 for (i = 0; i < 5; i++) {
352 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
353 res = si->dft->lldd_abort_task(task);
355 spin_lock_irqsave(&task->task_state_lock, flags);
356 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
357 spin_unlock_irqrestore(&task->task_state_lock, flags);
358 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
362 spin_unlock_irqrestore(&task->task_state_lock, flags);
364 if (res == TMF_RESP_FUNC_COMPLETE) {
365 SAS_DPRINTK("%s: task 0x%p is aborted\n",
367 return TASK_IS_ABORTED;
368 } else if (si->dft->lldd_query_task) {
369 SAS_DPRINTK("%s: querying task 0x%p\n",
371 res = si->dft->lldd_query_task(task);
373 case TMF_RESP_FUNC_SUCC:
374 SAS_DPRINTK("%s: task 0x%p at LU\n",
376 return TASK_IS_AT_LU;
377 case TMF_RESP_FUNC_COMPLETE:
378 SAS_DPRINTK("%s: task 0x%p not at LU\n",
380 return TASK_IS_NOT_AT_LU;
381 case TMF_RESP_FUNC_FAILED:
382 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
384 return TASK_ABORT_FAILED;
392 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
394 int res = TMF_RESP_FUNC_FAILED;
396 struct sas_internal *i =
397 to_sas_internal(dev->port->ha->core.shost->transportt);
399 int_to_scsilun(cmd->device->lun, &lun);
401 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
402 SAS_ADDR(dev->sas_addr),
405 if (i->dft->lldd_abort_task_set)
406 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
408 if (res == TMF_RESP_FUNC_FAILED) {
409 if (i->dft->lldd_clear_task_set)
410 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
413 if (res == TMF_RESP_FUNC_FAILED) {
414 if (i->dft->lldd_lu_reset)
415 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
421 static int sas_recover_I_T(struct domain_device *dev)
423 int res = TMF_RESP_FUNC_FAILED;
424 struct sas_internal *i =
425 to_sas_internal(dev->port->ha->core.shost->transportt);
427 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
428 SAS_ADDR(dev->sas_addr));
430 if (i->dft->lldd_I_T_nexus_reset)
431 res = i->dft->lldd_I_T_nexus_reset(dev);
436 /* Find the sas_phy that's attached to this device */
437 static struct sas_phy *find_local_sas_phy(struct domain_device *dev)
439 struct domain_device *pdev = dev->parent;
440 struct ex_phy *exphy = NULL;
443 /* Directly attached device */
445 return dev->port->phy;
447 /* Otherwise look in the expander */
448 for (i = 0; i < pdev->ex_dev.num_phys; i++)
449 if (!memcmp(dev->sas_addr,
450 pdev->ex_dev.ex_phy[i].attached_sas_addr,
452 exphy = &pdev->ex_dev.ex_phy[i];
460 /* Attempt to send a LUN reset message to a device */
461 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
463 struct domain_device *dev = cmd_to_domain_dev(cmd);
464 struct sas_internal *i =
465 to_sas_internal(dev->port->ha->core.shost->transportt);
469 int_to_scsilun(cmd->device->lun, &lun);
471 if (!i->dft->lldd_lu_reset)
474 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
475 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
481 /* Attempt to send a phy (bus) reset */
482 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
484 struct domain_device *dev = cmd_to_domain_dev(cmd);
485 struct sas_phy *phy = find_local_sas_phy(dev);
488 res = sas_phy_reset(phy, 1);
490 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
491 kobject_name(&phy->dev.kobj),
493 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
499 /* Try to reset a device */
500 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
501 struct scsi_cmnd *cmd)
505 if (!shost->hostt->eh_device_reset_handler)
508 res = shost->hostt->eh_device_reset_handler(cmd);
513 if (shost->hostt->eh_bus_reset_handler)
514 return shost->hostt->eh_bus_reset_handler(cmd);
519 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
520 struct list_head *work_q,
521 struct list_head *done_q)
523 struct scsi_cmnd *cmd, *n;
524 enum task_disposition res = TASK_IS_DONE;
525 int tmf_resp, need_reset;
526 struct sas_internal *i = to_sas_internal(shost->transportt);
528 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
531 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
532 struct sas_task *task = TO_SAS_TASK(cmd);
537 list_del_init(&cmd->eh_entry);
539 spin_lock_irqsave(&task->task_state_lock, flags);
540 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
541 spin_unlock_irqrestore(&task->task_state_lock, flags);
543 SAS_DPRINTK("trying to find task 0x%p\n", task);
544 res = sas_scsi_find_task(task);
550 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
552 sas_eh_finish_cmd(cmd);
554 try_to_reset_cmd_device(shost, cmd);
556 case TASK_IS_ABORTED:
557 SAS_DPRINTK("%s: task 0x%p is aborted\n",
559 sas_eh_finish_cmd(cmd);
561 try_to_reset_cmd_device(shost, cmd);
564 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
565 tmf_resp = sas_recover_lu(task->dev, cmd);
566 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
567 SAS_DPRINTK("dev %016llx LU %x is "
571 sas_eh_finish_cmd(cmd);
573 try_to_reset_cmd_device(shost, cmd);
574 sas_scsi_clear_queue_lu(work_q, cmd);
578 case TASK_IS_NOT_AT_LU:
579 case TASK_ABORT_FAILED:
580 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
582 tmf_resp = sas_recover_I_T(task->dev);
583 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
584 SAS_DPRINTK("I_T %016llx recovered\n",
585 SAS_ADDR(task->dev->sas_addr));
586 sas_eh_finish_cmd(cmd);
588 try_to_reset_cmd_device(shost, cmd);
589 sas_scsi_clear_queue_I_T(work_q, task->dev);
592 /* Hammer time :-) */
593 if (i->dft->lldd_clear_nexus_port) {
594 struct asd_sas_port *port = task->dev->port;
595 SAS_DPRINTK("clearing nexus for port:%d\n",
597 res = i->dft->lldd_clear_nexus_port(port);
598 if (res == TMF_RESP_FUNC_COMPLETE) {
599 SAS_DPRINTK("clear nexus port:%d "
600 "succeeded\n", port->id);
601 sas_eh_finish_cmd(cmd);
603 try_to_reset_cmd_device(shost, cmd);
604 sas_scsi_clear_queue_port(work_q,
609 if (i->dft->lldd_clear_nexus_ha) {
610 SAS_DPRINTK("clear nexus ha\n");
611 res = i->dft->lldd_clear_nexus_ha(ha);
612 if (res == TMF_RESP_FUNC_COMPLETE) {
613 SAS_DPRINTK("clear nexus ha "
615 sas_eh_finish_cmd(cmd);
617 try_to_reset_cmd_device(shost, cmd);
621 /* If we are here -- this means that no amount
622 * of effort could recover from errors. Quite
623 * possibly the HA just disappeared.
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),
630 sas_eh_finish_cmd(cmd);
632 try_to_reset_cmd_device(shost, cmd);
636 return list_empty(work_q);
638 SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
639 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
640 sas_eh_finish_cmd(cmd);
642 return list_empty(work_q);
645 void sas_scsi_recover_host(struct Scsi_Host *shost)
647 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
649 LIST_HEAD(eh_work_q);
651 spin_lock_irqsave(shost->host_lock, flags);
652 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
653 spin_unlock_irqrestore(shost->host_lock, flags);
655 SAS_DPRINTK("Enter %s\n", __FUNCTION__);
657 * Deal with commands that still have SAS tasks (i.e. they didn't
658 * complete via the normal sas_task completion mechanism)
660 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
664 * Now deal with SCSI commands that completed ok but have a an error
665 * code (and hopefully sense data) attached. This is roughly what
666 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
667 * command we see here has no sas_task and is thus unknown to the HA.
669 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
670 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
673 scsi_eh_flush_done_q(&ha->eh_done_q);
674 SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
678 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
680 struct sas_task *task = TO_SAS_TASK(cmd);
684 cmd->timeout_per_command /= 2;
685 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
686 cmd, task, (cmd->timeout_per_command ?
687 "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
688 if (!cmd->timeout_per_command)
689 return EH_NOT_HANDLED;
690 return EH_RESET_TIMER;
693 spin_lock_irqsave(&task->task_state_lock, flags);
694 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
695 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
696 spin_unlock_irqrestore(&task->task_state_lock, flags);
697 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
701 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
702 spin_unlock_irqrestore(&task->task_state_lock, flags);
703 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
706 return EH_RESET_TIMER;
708 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
709 spin_unlock_irqrestore(&task->task_state_lock, flags);
711 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
714 return EH_NOT_HANDLED;
717 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
719 struct domain_device *dev = sdev_to_domain_dev(sdev);
721 if (dev_is_sata(dev))
722 return ata_scsi_ioctl(sdev, cmd, arg);
727 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
729 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
730 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
731 struct domain_device *found_dev = NULL;
735 spin_lock_irqsave(&ha->phy_port_lock, flags);
736 for (i = 0; i < ha->num_phys; i++) {
737 struct asd_sas_port *port = ha->sas_port[i];
738 struct domain_device *dev;
740 spin_lock(&port->dev_list_lock);
741 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
742 if (rphy == dev->rphy) {
744 spin_unlock(&port->dev_list_lock);
748 spin_unlock(&port->dev_list_lock);
751 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
756 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
758 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
760 return sas_find_dev_by_rphy(rphy);
763 int sas_target_alloc(struct scsi_target *starget)
765 struct domain_device *found_dev = sas_find_target(starget);
771 if (dev_is_sata(found_dev)) {
772 res = sas_ata_init_host_and_port(found_dev, starget);
777 starget->hostdata = found_dev;
781 #define SAS_DEF_QD 32
782 #define SAS_MAX_QD 64
784 int sas_slave_configure(struct scsi_device *scsi_dev)
786 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
787 struct sas_ha_struct *sas_ha;
789 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
791 if (dev_is_sata(dev)) {
792 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
796 sas_ha = dev->port->ha;
798 sas_read_port_mode_page(scsi_dev);
800 if (scsi_dev->tagged_supported) {
801 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
802 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
804 SAS_DPRINTK("device %llx, LUN %x doesn't support "
805 "TCQ\n", SAS_ADDR(dev->sas_addr),
807 scsi_dev->tagged_supported = 0;
808 scsi_set_tag_type(scsi_dev, 0);
809 scsi_deactivate_tcq(scsi_dev, 1);
812 scsi_dev->allow_restart = 1;
817 void sas_slave_destroy(struct scsi_device *scsi_dev)
819 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
821 if (dev_is_sata(dev))
822 ata_port_disable(dev->sata_dev.ap);
825 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
827 int res = min(new_depth, SAS_MAX_QD);
829 if (scsi_dev->tagged_supported)
830 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
833 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
834 sas_printk("device %llx LUN %x queue depth changed to 1\n",
835 SAS_ADDR(dev->sas_addr),
837 scsi_adjust_queue_depth(scsi_dev, 0, 1);
844 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
846 if (!scsi_dev->tagged_supported)
849 scsi_deactivate_tcq(scsi_dev, 1);
851 scsi_set_tag_type(scsi_dev, qt);
852 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
857 int sas_bios_param(struct scsi_device *scsi_dev,
858 struct block_device *bdev,
859 sector_t capacity, int *hsc)
863 sector_div(capacity, 255*63);
869 /* ---------- Task Collector Thread implementation ---------- */
871 static void sas_queue(struct sas_ha_struct *sas_ha)
873 struct scsi_core *core = &sas_ha->core;
878 struct sas_internal *i = to_sas_internal(core->shost->transportt);
880 spin_lock_irqsave(&core->task_queue_lock, flags);
881 while (!kthread_should_stop() &&
882 !list_empty(&core->task_queue)) {
884 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
885 if (can_queue >= 0) {
886 can_queue = core->task_queue_size;
887 list_splice_init(&core->task_queue, &q);
889 struct list_head *a, *n;
891 can_queue = sas_ha->lldd_queue_size;
892 list_for_each_safe(a, n, &core->task_queue) {
893 list_move_tail(a, &q);
894 if (--can_queue == 0)
897 can_queue = sas_ha->lldd_queue_size;
899 core->task_queue_size -= can_queue;
900 spin_unlock_irqrestore(&core->task_queue_lock, flags);
902 struct sas_task *task = list_entry(q.next,
906 res = i->dft->lldd_execute_task(task, can_queue,
909 __list_add(&q, task->list.prev, &task->list);
911 spin_lock_irqsave(&core->task_queue_lock, flags);
913 list_splice_init(&q, &core->task_queue); /*at head*/
914 core->task_queue_size += can_queue;
917 spin_unlock_irqrestore(&core->task_queue_lock, flags);
921 * sas_queue_thread -- The Task Collector thread
922 * @_sas_ha: pointer to struct sas_ha
924 static int sas_queue_thread(void *_sas_ha)
926 struct sas_ha_struct *sas_ha = _sas_ha;
929 set_current_state(TASK_INTERRUPTIBLE);
932 if (kthread_should_stop())
939 int sas_init_queue(struct sas_ha_struct *sas_ha)
941 struct scsi_core *core = &sas_ha->core;
943 spin_lock_init(&core->task_queue_lock);
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 * Call the LLDD task abort routine directly. This function is intended for
982 * use by upper layers that need to tell the LLDD to abort a task.
984 int __sas_task_abort(struct sas_task *task)
986 struct sas_internal *si =
987 to_sas_internal(task->dev->port->ha->core.shost->transportt);
991 spin_lock_irqsave(&task->task_state_lock, flags);
992 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
993 task->task_state_flags & SAS_TASK_STATE_DONE) {
994 spin_unlock_irqrestore(&task->task_state_lock, flags);
995 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
999 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1000 spin_unlock_irqrestore(&task->task_state_lock, flags);
1002 if (!si->dft->lldd_abort_task)
1005 res = si->dft->lldd_abort_task(task);
1007 spin_lock_irqsave(&task->task_state_lock, flags);
1008 if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1009 (res == TMF_RESP_FUNC_COMPLETE))
1011 spin_unlock_irqrestore(&task->task_state_lock, flags);
1012 task->task_done(task);
1016 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1017 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1018 spin_unlock_irqrestore(&task->task_state_lock, flags);
1024 * Tell an upper layer that it needs to initiate an abort for a given task.
1025 * This should only ever be called by an LLDD.
1027 void sas_task_abort(struct sas_task *task)
1029 struct scsi_cmnd *sc = task->uldd_task;
1031 /* Escape for libsas internal commands */
1033 if (!del_timer(&task->timer))
1035 task->timer.function(task->timer.data);
1039 if (dev_is_sata(task->dev)) {
1040 sas_ata_task_abort(task);
1044 scsi_req_abort_cmd(sc);
1045 scsi_schedule_eh(sc->device->host);
1048 int sas_slave_alloc(struct scsi_device *scsi_dev)
1050 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1052 if (dev_is_sata(dev))
1053 return ata_sas_port_init(dev->sata_dev.ap);
1058 void sas_target_destroy(struct scsi_target *starget)
1060 struct domain_device *found_dev = sas_find_target(starget);
1065 if (dev_is_sata(found_dev))
1066 ata_sas_port_destroy(found_dev->sata_dev.ap);
1071 EXPORT_SYMBOL_GPL(sas_queuecommand);
1072 EXPORT_SYMBOL_GPL(sas_target_alloc);
1073 EXPORT_SYMBOL_GPL(sas_slave_configure);
1074 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1075 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1076 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1077 EXPORT_SYMBOL_GPL(sas_bios_param);
1078 EXPORT_SYMBOL_GPL(__sas_task_abort);
1079 EXPORT_SYMBOL_GPL(sas_task_abort);
1080 EXPORT_SYMBOL_GPL(sas_phy_reset);
1081 EXPORT_SYMBOL_GPL(sas_phy_enable);
1082 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1083 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1084 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1085 EXPORT_SYMBOL_GPL(sas_target_destroy);
1086 EXPORT_SYMBOL_GPL(sas_ioctl);