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/ctype.h>
30 #include "sas_internal.h"
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"
44 #include <linux/err.h>
45 #include <linux/blkdev.h>
46 #include <linux/freezer.h>
47 #include <linux/gfp.h>
48 #include <linux/scatterlist.h>
49 #include <linux/libata.h>
51 /* ---------- SCSI Host glue ---------- */
53 static void sas_scsi_task_done(struct sas_task *task)
55 struct task_status_struct *ts = &task->task_status;
56 struct scsi_cmnd *sc = task->uldd_task;
59 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
60 /* Aborted tasks will be completed by the error handler */
61 SAS_DPRINTK("task done but aborted\n");
66 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
67 list_del_init(&task->list);
72 if (ts->resp == SAS_TASK_UNDELIVERED) {
75 } else { /* ts->resp == SAS_TASK_COMPLETE */
76 /* task delivered, what happened afterwards? */
78 case SAS_DEV_NO_RESPONSE:
85 case SAS_DATA_UNDERRUN:
86 scsi_set_resid(sc, ts->residual);
87 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
90 case SAS_DATA_OVERRUN:
94 hs = DID_SOFT_ERROR; /* retry */
96 case SAS_DEVICE_UNKNOWN:
102 case SAS_OPEN_REJECT:
103 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
104 hs = DID_SOFT_ERROR; /* retry */
108 case SAS_PROTO_RESPONSE:
109 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
110 "task; please report this\n",
111 task->dev->port->ha->sas_ha_name);
113 case SAS_ABORTED_TASK:
116 case SAM_STAT_CHECK_CONDITION:
117 memcpy(sc->sense_buffer, ts->buf,
118 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
119 stat = SAM_STAT_CHECK_CONDITION;
126 ASSIGN_SAS_TASK(sc, NULL);
127 sc->result = (hs << 16) | stat;
128 list_del_init(&task->list);
133 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
134 struct domain_device *dev,
137 struct sas_task *task = sas_alloc_task(gfp_flags);
143 task->uldd_task = cmd;
144 ASSIGN_SAS_TASK(cmd, task);
147 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
149 task->ssp_task.retry_count = 1;
150 int_to_scsilun(cmd->device->lun, &lun);
151 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
152 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
153 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
155 task->scatter = scsi_sglist(cmd);
156 task->num_scatter = scsi_sg_count(cmd);
157 task->total_xfer_len = scsi_bufflen(cmd);
158 task->data_dir = cmd->sc_data_direction;
160 task->task_done = sas_scsi_task_done;
165 int sas_queue_up(struct sas_task *task)
167 struct sas_ha_struct *sas_ha = task->dev->port->ha;
168 struct scsi_core *core = &sas_ha->core;
172 spin_lock_irqsave(&core->task_queue_lock, flags);
173 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
174 spin_unlock_irqrestore(&core->task_queue_lock, flags);
175 return -SAS_QUEUE_FULL;
177 list_add_tail(&task->list, &core->task_queue);
178 core->task_queue_size += 1;
179 spin_unlock_irqrestore(&core->task_queue_lock, flags);
180 wake_up_process(core->queue_thread);
186 * sas_queuecommand -- Enqueue a command for processing
187 * @parameters: See SCSI Core documentation
189 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
190 * call us without holding an IRQ spinlock...
192 int sas_queuecommand(struct scsi_cmnd *cmd,
193 void (*scsi_done)(struct scsi_cmnd *))
194 __releases(host->host_lock)
195 __acquires(dev->sata_dev.ap->lock)
196 __releases(dev->sata_dev.ap->lock)
197 __acquires(host->host_lock)
200 struct domain_device *dev = cmd_to_domain_dev(cmd);
201 struct Scsi_Host *host = cmd->device->host;
202 struct sas_internal *i = to_sas_internal(host->transportt);
204 spin_unlock_irq(host->host_lock);
207 struct sas_ha_struct *sas_ha = dev->port->ha;
208 struct sas_task *task;
210 if (dev_is_sata(dev)) {
213 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
214 res = ata_sas_queuecmd(cmd, scsi_done,
216 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
220 /* If the device fell off, no sense in issuing commands */
222 cmd->result = DID_BAD_TARGET << 16;
228 task = sas_create_task(cmd, dev, GFP_ATOMIC);
232 cmd->scsi_done = scsi_done;
233 /* Queue up, Direct Mode or Task Collector Mode. */
234 if (sas_ha->lldd_max_execute_num < 2)
235 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
237 res = sas_queue_up(task);
241 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
242 ASSIGN_SAS_TASK(cmd, NULL);
244 if (res == -SAS_QUEUE_FULL) {
245 cmd->result = DID_SOFT_ERROR << 16; /* retry */
253 spin_lock_irq(host->host_lock);
257 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
259 struct sas_task *task = TO_SAS_TASK(cmd);
260 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
262 /* remove the aborted task flag to allow the task to be
263 * completed now. At this point, we only get called following
264 * an actual abort of the task, so we should be guaranteed not
265 * to be racing with any completions from the LLD (hence we
266 * don't need the task state lock to clear the flag) */
267 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
268 /* Now call task_done. However, task will be free'd after
270 task->task_done(task);
271 /* now finish the command and move it on to the error
272 * handler done list, this also takes it off the
273 * error handler pending list */
274 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
277 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
279 struct scsi_cmnd *cmd, *n;
281 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
282 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
283 cmd->device->lun == my_cmd->device->lun)
284 sas_eh_finish_cmd(cmd);
288 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
289 struct domain_device *dev)
291 struct scsi_cmnd *cmd, *n;
293 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
294 struct domain_device *x = cmd_to_domain_dev(cmd);
297 sas_eh_finish_cmd(cmd);
301 static void sas_scsi_clear_queue_port(struct list_head *error_q,
302 struct asd_sas_port *port)
304 struct scsi_cmnd *cmd, *n;
306 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
307 struct domain_device *dev = cmd_to_domain_dev(cmd);
308 struct asd_sas_port *x = dev->port;
311 sas_eh_finish_cmd(cmd);
315 enum task_disposition {
323 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
325 struct sas_ha_struct *ha = task->dev->port->ha;
328 struct sas_internal *si =
329 to_sas_internal(task->dev->port->ha->core.shost->transportt);
331 if (ha->lldd_max_execute_num > 1) {
332 struct scsi_core *core = &ha->core;
333 struct sas_task *t, *n;
335 spin_lock_irqsave(&core->task_queue_lock, flags);
336 list_for_each_entry_safe(t, n, &core->task_queue, list) {
338 list_del_init(&t->list);
339 spin_unlock_irqrestore(&core->task_queue_lock,
341 SAS_DPRINTK("%s: task 0x%p aborted from "
344 return TASK_IS_ABORTED;
347 spin_unlock_irqrestore(&core->task_queue_lock, flags);
350 for (i = 0; i < 5; i++) {
351 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
352 res = si->dft->lldd_abort_task(task);
354 spin_lock_irqsave(&task->task_state_lock, flags);
355 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
356 spin_unlock_irqrestore(&task->task_state_lock, flags);
357 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
361 spin_unlock_irqrestore(&task->task_state_lock, flags);
363 if (res == TMF_RESP_FUNC_COMPLETE) {
364 SAS_DPRINTK("%s: task 0x%p is aborted\n",
366 return TASK_IS_ABORTED;
367 } else if (si->dft->lldd_query_task) {
368 SAS_DPRINTK("%s: querying task 0x%p\n",
370 res = si->dft->lldd_query_task(task);
372 case TMF_RESP_FUNC_SUCC:
373 SAS_DPRINTK("%s: task 0x%p at LU\n",
375 return TASK_IS_AT_LU;
376 case TMF_RESP_FUNC_COMPLETE:
377 SAS_DPRINTK("%s: task 0x%p not at LU\n",
379 return TASK_IS_NOT_AT_LU;
380 case TMF_RESP_FUNC_FAILED:
381 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
383 return TASK_ABORT_FAILED;
391 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
393 int res = TMF_RESP_FUNC_FAILED;
395 struct sas_internal *i =
396 to_sas_internal(dev->port->ha->core.shost->transportt);
398 int_to_scsilun(cmd->device->lun, &lun);
400 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
401 SAS_ADDR(dev->sas_addr),
404 if (i->dft->lldd_abort_task_set)
405 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
407 if (res == TMF_RESP_FUNC_FAILED) {
408 if (i->dft->lldd_clear_task_set)
409 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
412 if (res == TMF_RESP_FUNC_FAILED) {
413 if (i->dft->lldd_lu_reset)
414 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
420 static int sas_recover_I_T(struct domain_device *dev)
422 int res = TMF_RESP_FUNC_FAILED;
423 struct sas_internal *i =
424 to_sas_internal(dev->port->ha->core.shost->transportt);
426 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
427 SAS_ADDR(dev->sas_addr));
429 if (i->dft->lldd_I_T_nexus_reset)
430 res = i->dft->lldd_I_T_nexus_reset(dev);
435 /* Find the sas_phy that's attached to this device */
436 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
438 struct domain_device *pdev = dev->parent;
439 struct ex_phy *exphy = NULL;
442 /* Directly attached device */
444 return dev->port->phy;
446 /* Otherwise look in the expander */
447 for (i = 0; i < pdev->ex_dev.num_phys; i++)
448 if (!memcmp(dev->sas_addr,
449 pdev->ex_dev.ex_phy[i].attached_sas_addr,
451 exphy = &pdev->ex_dev.ex_phy[i];
458 EXPORT_SYMBOL_GPL(sas_find_local_phy);
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 = sas_find_local_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_cmnd *cmd)
503 struct Scsi_Host *shost = cmd->device->host;
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);
544 SAS_DPRINTK("%s: task 0x%p requests reset\n",
549 SAS_DPRINTK("trying to find task 0x%p\n", task);
550 res = sas_scsi_find_task(task);
556 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
558 sas_eh_finish_cmd(cmd);
560 case TASK_IS_ABORTED:
561 SAS_DPRINTK("%s: task 0x%p is aborted\n",
563 sas_eh_finish_cmd(cmd);
566 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
568 tmf_resp = sas_recover_lu(task->dev, cmd);
569 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
570 SAS_DPRINTK("dev %016llx LU %x is "
574 sas_eh_finish_cmd(cmd);
575 sas_scsi_clear_queue_lu(work_q, cmd);
579 case TASK_IS_NOT_AT_LU:
580 case TASK_ABORT_FAILED:
581 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
583 tmf_resp = sas_recover_I_T(task->dev);
584 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
585 struct domain_device *dev = task->dev;
586 SAS_DPRINTK("I_T %016llx recovered\n",
587 SAS_ADDR(task->dev->sas_addr));
588 sas_eh_finish_cmd(cmd);
589 sas_scsi_clear_queue_I_T(work_q, dev);
592 /* Hammer time :-) */
593 try_to_reset_cmd_device(cmd);
594 if (i->dft->lldd_clear_nexus_port) {
595 struct asd_sas_port *port = task->dev->port;
596 SAS_DPRINTK("clearing nexus for port:%d\n",
598 res = i->dft->lldd_clear_nexus_port(port);
599 if (res == TMF_RESP_FUNC_COMPLETE) {
600 SAS_DPRINTK("clear nexus port:%d "
601 "succeeded\n", port->id);
602 sas_eh_finish_cmd(cmd);
603 sas_scsi_clear_queue_port(work_q,
608 if (i->dft->lldd_clear_nexus_ha) {
609 SAS_DPRINTK("clear nexus ha\n");
610 res = i->dft->lldd_clear_nexus_ha(ha);
611 if (res == TMF_RESP_FUNC_COMPLETE) {
612 SAS_DPRINTK("clear nexus ha "
614 sas_eh_finish_cmd(cmd);
618 /* If we are here -- this means that no amount
619 * of effort could recover from errors. Quite
620 * possibly the HA just disappeared.
622 SAS_DPRINTK("error from device %llx, LUN %x "
623 "couldn't be recovered in any way\n",
624 SAS_ADDR(task->dev->sas_addr),
627 sas_eh_finish_cmd(cmd);
631 return list_empty(work_q);
633 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
634 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
635 sas_eh_finish_cmd(cmd);
637 return list_empty(work_q);
640 void sas_scsi_recover_host(struct Scsi_Host *shost)
642 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
644 LIST_HEAD(eh_work_q);
646 spin_lock_irqsave(shost->host_lock, flags);
647 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
648 spin_unlock_irqrestore(shost->host_lock, flags);
650 SAS_DPRINTK("Enter %s\n", __func__);
652 * Deal with commands that still have SAS tasks (i.e. they didn't
653 * complete via the normal sas_task completion mechanism)
655 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
659 * Now deal with SCSI commands that completed ok but have a an error
660 * code (and hopefully sense data) attached. This is roughly what
661 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
662 * command we see here has no sas_task and is thus unknown to the HA.
664 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
665 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
668 scsi_eh_flush_done_q(&ha->eh_done_q);
669 SAS_DPRINTK("--- Exit %s\n", __func__);
673 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
675 struct sas_task *task = TO_SAS_TASK(cmd);
679 cmd->request->timeout /= 2;
680 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
681 cmd, task, (cmd->request->timeout ?
682 "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
683 if (!cmd->request->timeout)
684 return BLK_EH_NOT_HANDLED;
685 return BLK_EH_RESET_TIMER;
688 spin_lock_irqsave(&task->task_state_lock, flags);
689 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
690 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
691 spin_unlock_irqrestore(&task->task_state_lock, flags);
692 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
693 "BLK_EH_HANDLED\n", cmd, task);
694 return BLK_EH_HANDLED;
696 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
697 spin_unlock_irqrestore(&task->task_state_lock, flags);
698 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
699 "BLK_EH_RESET_TIMER\n",
701 return BLK_EH_RESET_TIMER;
703 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
704 spin_unlock_irqrestore(&task->task_state_lock, flags);
706 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
709 return BLK_EH_NOT_HANDLED;
712 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
714 struct domain_device *dev = sdev_to_domain_dev(sdev);
716 if (dev_is_sata(dev))
717 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
722 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
724 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
725 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
726 struct domain_device *found_dev = NULL;
730 spin_lock_irqsave(&ha->phy_port_lock, flags);
731 for (i = 0; i < ha->num_phys; i++) {
732 struct asd_sas_port *port = ha->sas_port[i];
733 struct domain_device *dev;
735 spin_lock(&port->dev_list_lock);
736 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
737 if (rphy == dev->rphy) {
739 spin_unlock(&port->dev_list_lock);
743 spin_unlock(&port->dev_list_lock);
746 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
751 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
753 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
755 return sas_find_dev_by_rphy(rphy);
758 int sas_target_alloc(struct scsi_target *starget)
760 struct domain_device *found_dev = sas_find_target(starget);
766 if (dev_is_sata(found_dev)) {
767 res = sas_ata_init_host_and_port(found_dev, starget);
772 starget->hostdata = found_dev;
776 #define SAS_DEF_QD 32
777 #define SAS_MAX_QD 64
779 int sas_slave_configure(struct scsi_device *scsi_dev)
781 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
782 struct sas_ha_struct *sas_ha;
784 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
786 if (dev_is_sata(dev)) {
787 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
791 sas_ha = dev->port->ha;
793 sas_read_port_mode_page(scsi_dev);
795 if (scsi_dev->tagged_supported) {
796 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
797 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
799 SAS_DPRINTK("device %llx, LUN %x doesn't support "
800 "TCQ\n", SAS_ADDR(dev->sas_addr),
802 scsi_dev->tagged_supported = 0;
803 scsi_set_tag_type(scsi_dev, 0);
804 scsi_deactivate_tcq(scsi_dev, 1);
807 scsi_dev->allow_restart = 1;
812 void sas_slave_destroy(struct scsi_device *scsi_dev)
814 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
816 if (dev_is_sata(dev))
817 dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE;
820 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
823 int res = min(new_depth, SAS_MAX_QD);
825 if (reason != SCSI_QDEPTH_DEFAULT)
828 if (scsi_dev->tagged_supported)
829 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
832 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
833 sas_printk("device %llx LUN %x queue depth changed to 1\n",
834 SAS_ADDR(dev->sas_addr),
836 scsi_adjust_queue_depth(scsi_dev, 0, 1);
843 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
845 if (!scsi_dev->tagged_supported)
848 scsi_deactivate_tcq(scsi_dev, 1);
850 scsi_set_tag_type(scsi_dev, qt);
851 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
856 int sas_bios_param(struct scsi_device *scsi_dev,
857 struct block_device *bdev,
858 sector_t capacity, int *hsc)
862 sector_div(capacity, 255*63);
868 /* ---------- Task Collector Thread implementation ---------- */
870 static void sas_queue(struct sas_ha_struct *sas_ha)
872 struct scsi_core *core = &sas_ha->core;
877 struct sas_internal *i = to_sas_internal(core->shost->transportt);
879 spin_lock_irqsave(&core->task_queue_lock, flags);
880 while (!kthread_should_stop() &&
881 !list_empty(&core->task_queue)) {
883 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
884 if (can_queue >= 0) {
885 can_queue = core->task_queue_size;
886 list_splice_init(&core->task_queue, &q);
888 struct list_head *a, *n;
890 can_queue = sas_ha->lldd_queue_size;
891 list_for_each_safe(a, n, &core->task_queue) {
892 list_move_tail(a, &q);
893 if (--can_queue == 0)
896 can_queue = sas_ha->lldd_queue_size;
898 core->task_queue_size -= can_queue;
899 spin_unlock_irqrestore(&core->task_queue_lock, flags);
901 struct sas_task *task = list_entry(q.next,
905 res = i->dft->lldd_execute_task(task, can_queue,
908 __list_add(&q, task->list.prev, &task->list);
910 spin_lock_irqsave(&core->task_queue_lock, flags);
912 list_splice_init(&q, &core->task_queue); /*at head*/
913 core->task_queue_size += can_queue;
916 spin_unlock_irqrestore(&core->task_queue_lock, flags);
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 core->task_queue_size = 0;
944 INIT_LIST_HEAD(&core->task_queue);
946 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
947 "sas_queue_%d", core->shost->host_no);
948 if (IS_ERR(core->queue_thread))
949 return PTR_ERR(core->queue_thread);
953 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
956 struct scsi_core *core = &sas_ha->core;
957 struct sas_task *task, *n;
959 kthread_stop(core->queue_thread);
961 if (!list_empty(&core->task_queue))
962 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
963 SAS_ADDR(sas_ha->sas_addr));
965 spin_lock_irqsave(&core->task_queue_lock, flags);
966 list_for_each_entry_safe(task, n, &core->task_queue, list) {
967 struct scsi_cmnd *cmd = task->uldd_task;
969 list_del_init(&task->list);
971 ASSIGN_SAS_TASK(cmd, NULL);
973 cmd->result = DID_ABORT << 16;
976 spin_unlock_irqrestore(&core->task_queue_lock, flags);
980 * Call the LLDD task abort routine directly. This function is intended for
981 * use by upper layers that need to tell the LLDD to abort a task.
983 int __sas_task_abort(struct sas_task *task)
985 struct sas_internal *si =
986 to_sas_internal(task->dev->port->ha->core.shost->transportt);
990 spin_lock_irqsave(&task->task_state_lock, flags);
991 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
992 task->task_state_flags & SAS_TASK_STATE_DONE) {
993 spin_unlock_irqrestore(&task->task_state_lock, flags);
994 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
998 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
999 spin_unlock_irqrestore(&task->task_state_lock, flags);
1001 if (!si->dft->lldd_abort_task)
1004 res = si->dft->lldd_abort_task(task);
1006 spin_lock_irqsave(&task->task_state_lock, flags);
1007 if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1008 (res == TMF_RESP_FUNC_COMPLETE))
1010 spin_unlock_irqrestore(&task->task_state_lock, flags);
1011 task->task_done(task);
1015 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1016 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1017 spin_unlock_irqrestore(&task->task_state_lock, flags);
1023 * Tell an upper layer that it needs to initiate an abort for a given task.
1024 * This should only ever be called by an LLDD.
1026 void sas_task_abort(struct sas_task *task)
1028 struct scsi_cmnd *sc = task->uldd_task;
1030 /* Escape for libsas internal commands */
1032 if (!del_timer(&task->timer))
1034 task->timer.function(task->timer.data);
1038 if (dev_is_sata(task->dev)) {
1039 sas_ata_task_abort(task);
1041 struct request_queue *q = sc->device->request_queue;
1042 unsigned long flags;
1044 spin_lock_irqsave(q->queue_lock, flags);
1045 blk_abort_request(sc->request);
1046 spin_unlock_irqrestore(q->queue_lock, flags);
1047 scsi_schedule_eh(sc->device->host);
1051 int sas_slave_alloc(struct scsi_device *scsi_dev)
1053 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1055 if (dev_is_sata(dev))
1056 return ata_sas_port_init(dev->sata_dev.ap);
1061 void sas_target_destroy(struct scsi_target *starget)
1063 struct domain_device *found_dev = sas_find_target(starget);
1068 if (dev_is_sata(found_dev))
1069 ata_sas_port_destroy(found_dev->sata_dev.ap);
1074 static void sas_parse_addr(u8 *sas_addr, const char *p)
1077 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1081 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1083 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1085 sas_addr[i] = (h<<4) | l;
1089 #define SAS_STRING_ADDR_SIZE 16
1091 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1094 const struct firmware *fw;
1096 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1100 if (fw->size < SAS_STRING_ADDR_SIZE) {
1105 sas_parse_addr(addr, fw->data);
1108 release_firmware(fw);
1111 EXPORT_SYMBOL_GPL(sas_request_addr);
1113 EXPORT_SYMBOL_GPL(sas_queuecommand);
1114 EXPORT_SYMBOL_GPL(sas_target_alloc);
1115 EXPORT_SYMBOL_GPL(sas_slave_configure);
1116 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1117 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1118 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1119 EXPORT_SYMBOL_GPL(sas_bios_param);
1120 EXPORT_SYMBOL_GPL(__sas_task_abort);
1121 EXPORT_SYMBOL_GPL(sas_task_abort);
1122 EXPORT_SYMBOL_GPL(sas_phy_reset);
1123 EXPORT_SYMBOL_GPL(sas_phy_enable);
1124 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1125 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1126 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1127 EXPORT_SYMBOL_GPL(sas_target_destroy);
1128 EXPORT_SYMBOL_GPL(sas_ioctl);