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56 #include <linux/completion.h>
57 #include <linux/irqflags.h>
59 #include <scsi/libsas.h>
60 #include "remote_device.h"
61 #include "remote_node_context.h"
68 * isci_task_refuse() - complete the request to the upper layer driver in
69 * the case where an I/O needs to be completed back in the submit path.
70 * @ihost: host on which the the request was queued
71 * @task: request to complete
72 * @response: response code for the completed task.
73 * @status: status code for the completed task.
76 static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
77 enum service_response response,
78 enum exec_status status)
83 /* Normal notification (task_done) */
84 dev_dbg(&ihost->pdev->dev, "%s: task = %p, response=%d, status=%d\n",
85 __func__, task, response, status);
87 spin_lock_irqsave(&task->task_state_lock, flags);
89 task->task_status.resp = response;
90 task->task_status.stat = status;
92 /* Normal notification (task_done) */
93 task->task_state_flags |= SAS_TASK_STATE_DONE;
94 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
95 SAS_TASK_STATE_PENDING);
96 task->lldd_task = NULL;
97 spin_unlock_irqrestore(&task->task_state_lock, flags);
99 task->task_done(task);
102 #define for_each_sas_task(num, task) \
103 for (; num > 0; num--,\
104 task = list_entry(task->list.next, struct sas_task, list))
107 static inline int isci_device_io_ready(struct isci_remote_device *idev,
108 struct sas_task *task)
110 return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
111 (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
112 isci_task_is_ncq_recovery(task))
116 * isci_task_execute_task() - This function is one of the SAS Domain Template
117 * functions. This function is called by libsas to send a task down to
119 * @task: This parameter specifies the SAS task to send.
120 * @num: This parameter specifies the number of tasks to queue.
121 * @gfp_flags: This parameter specifies the context of this call.
123 * status, zero indicates success.
125 int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
127 struct isci_host *ihost = dev_to_ihost(task->dev);
128 struct isci_remote_device *idev;
133 dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
135 for_each_sas_task(num, task) {
136 enum sci_status status = SCI_FAILURE;
138 spin_lock_irqsave(&ihost->scic_lock, flags);
139 idev = isci_lookup_device(task->dev);
140 io_ready = isci_device_io_ready(idev, task);
141 tag = isci_alloc_tag(ihost);
142 spin_unlock_irqrestore(&ihost->scic_lock, flags);
144 dev_dbg(&ihost->pdev->dev,
145 "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
146 task, num, task->dev, idev, idev ? idev->flags : 0,
150 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
152 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
153 /* Indicate QUEUE_FULL so that the scsi midlayer
156 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
159 /* There is a device and it's ready for I/O. */
160 spin_lock_irqsave(&task->task_state_lock, flags);
162 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
163 /* The I/O was aborted. */
164 spin_unlock_irqrestore(&task->task_state_lock,
167 isci_task_refuse(ihost, task,
168 SAS_TASK_UNDELIVERED,
169 SAM_STAT_TASK_ABORTED);
171 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
172 spin_unlock_irqrestore(&task->task_state_lock, flags);
174 /* build and send the request. */
175 status = isci_request_execute(ihost, idev, task, tag);
177 if (status != SCI_SUCCESS) {
179 spin_lock_irqsave(&task->task_state_lock, flags);
180 /* Did not really start this command. */
181 task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
182 spin_unlock_irqrestore(&task->task_state_lock, flags);
184 if (test_bit(IDEV_GONE, &idev->flags)) {
186 /* Indicate that the device
189 isci_task_refuse(ihost, task,
190 SAS_TASK_UNDELIVERED,
193 /* Indicate QUEUE_FULL so that
194 * the scsi midlayer retries.
195 * If the request failed for
196 * remote device reasons, it
198 * SAS_TASK_UNDELIVERED next
201 isci_task_refuse(ihost, task,
208 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
209 spin_lock_irqsave(&ihost->scic_lock, flags);
210 /* command never hit the device, so just free
211 * the tci and skip the sequence increment
213 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
214 spin_unlock_irqrestore(&ihost->scic_lock, flags);
216 isci_put_device(idev);
221 static struct isci_request *isci_task_request_build(struct isci_host *ihost,
222 struct isci_remote_device *idev,
223 u16 tag, struct isci_tmf *isci_tmf)
225 enum sci_status status = SCI_FAILURE;
226 struct isci_request *ireq = NULL;
227 struct domain_device *dev;
229 dev_dbg(&ihost->pdev->dev,
230 "%s: isci_tmf = %p\n", __func__, isci_tmf);
232 dev = idev->domain_dev;
234 /* do common allocation and init of request object. */
235 ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
239 /* let the core do it's construct. */
240 status = sci_task_request_construct(ihost, idev, tag,
243 if (status != SCI_SUCCESS) {
244 dev_warn(&ihost->pdev->dev,
245 "%s: sci_task_request_construct failed - "
252 /* XXX convert to get this from task->tproto like other drivers */
253 if (dev->dev_type == SAS_END_DEVICE) {
254 isci_tmf->proto = SAS_PROTOCOL_SSP;
255 status = sci_task_request_construct_ssp(ireq);
256 if (status != SCI_SUCCESS)
263 static int isci_task_execute_tmf(struct isci_host *ihost,
264 struct isci_remote_device *idev,
265 struct isci_tmf *tmf, unsigned long timeout_ms)
267 DECLARE_COMPLETION_ONSTACK(completion);
268 enum sci_task_status status = SCI_TASK_FAILURE;
269 struct isci_request *ireq;
270 int ret = TMF_RESP_FUNC_FAILED;
272 unsigned long timeleft;
275 spin_lock_irqsave(&ihost->scic_lock, flags);
276 tag = isci_alloc_tag(ihost);
277 spin_unlock_irqrestore(&ihost->scic_lock, flags);
279 if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
282 /* sanity check, return TMF_RESP_FUNC_FAILED
283 * if the device is not there and ready.
286 (!test_bit(IDEV_IO_READY, &idev->flags) &&
287 !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
288 dev_dbg(&ihost->pdev->dev,
289 "%s: idev = %p not ready (%#lx)\n",
291 idev, idev ? idev->flags : 0);
294 dev_dbg(&ihost->pdev->dev,
298 /* Assign the pointer to the TMF's completion kernel wait structure. */
299 tmf->complete = &completion;
300 tmf->status = SCI_FAILURE_TIMEOUT;
302 ireq = isci_task_request_build(ihost, idev, tag, tmf);
306 spin_lock_irqsave(&ihost->scic_lock, flags);
308 /* start the TMF io. */
309 status = sci_controller_start_task(ihost, idev, ireq);
311 if (status != SCI_TASK_SUCCESS) {
312 dev_dbg(&ihost->pdev->dev,
313 "%s: start_io failed - status = 0x%x, request = %p\n",
317 spin_unlock_irqrestore(&ihost->scic_lock, flags);
320 spin_unlock_irqrestore(&ihost->scic_lock, flags);
322 /* The RNC must be unsuspended before the TMF can get a response. */
323 isci_remote_device_resume_from_abort(ihost, idev);
325 /* Wait for the TMF to complete, or a timeout. */
326 timeleft = wait_for_completion_timeout(&completion,
327 msecs_to_jiffies(timeout_ms));
330 /* The TMF did not complete - this could be because
331 * of an unplug. Terminate the TMF request now.
333 isci_remote_device_suspend_terminate(ihost, idev, ireq);
336 isci_print_tmf(ihost, tmf);
338 if (tmf->status == SCI_SUCCESS)
339 ret = TMF_RESP_FUNC_COMPLETE;
340 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
341 dev_dbg(&ihost->pdev->dev,
343 "SCI_FAILURE_IO_RESPONSE_VALID\n",
345 ret = TMF_RESP_FUNC_COMPLETE;
347 /* Else - leave the default "failed" status alone. */
349 dev_dbg(&ihost->pdev->dev,
350 "%s: completed request = %p\n",
357 spin_lock_irqsave(&ihost->scic_lock, flags);
358 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
359 spin_unlock_irqrestore(&ihost->scic_lock, flags);
364 static void isci_task_build_tmf(struct isci_tmf *tmf,
365 enum isci_tmf_function_codes code)
367 memset(tmf, 0, sizeof(*tmf));
368 tmf->tmf_code = code;
371 static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
372 enum isci_tmf_function_codes code,
373 struct isci_request *old_request)
375 isci_task_build_tmf(tmf, code);
376 tmf->io_tag = old_request->io_tag;
380 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
381 * Template functions.
382 * @lun: This parameter specifies the lun to be reset.
384 * status, zero indicates success.
386 static int isci_task_send_lu_reset_sas(
387 struct isci_host *isci_host,
388 struct isci_remote_device *isci_device,
392 int ret = TMF_RESP_FUNC_FAILED;
394 dev_dbg(&isci_host->pdev->dev,
395 "%s: isci_host = %p, isci_device = %p\n",
396 __func__, isci_host, isci_device);
397 /* Send the LUN reset to the target. By the time the call returns,
398 * the TMF has fully exected in the target (in which case the return
399 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
400 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
402 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
404 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
405 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
407 if (ret == TMF_RESP_FUNC_COMPLETE)
408 dev_dbg(&isci_host->pdev->dev,
409 "%s: %p: TMF_LU_RESET passed\n",
410 __func__, isci_device);
412 dev_dbg(&isci_host->pdev->dev,
413 "%s: %p: TMF_LU_RESET failed (%x)\n",
414 __func__, isci_device, ret);
419 int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
421 struct isci_host *ihost = dev_to_ihost(dev);
422 struct isci_remote_device *idev;
424 int ret = TMF_RESP_FUNC_COMPLETE;
426 spin_lock_irqsave(&ihost->scic_lock, flags);
427 idev = isci_get_device(dev->lldd_dev);
428 spin_unlock_irqrestore(&ihost->scic_lock, flags);
430 dev_dbg(&ihost->pdev->dev,
431 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
432 __func__, dev, ihost, idev);
435 /* If the device is gone, escalate to I_T_Nexus_Reset. */
436 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
438 ret = TMF_RESP_FUNC_FAILED;
442 /* Suspend the RNC, kill all TCs */
443 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
445 /* The suspend/terminate only fails if isci_get_device fails */
446 ret = TMF_RESP_FUNC_FAILED;
449 /* All pending I/Os have been terminated and cleaned up. */
450 if (!test_bit(IDEV_GONE, &idev->flags)) {
451 if (dev_is_sata(dev))
452 sas_ata_schedule_reset(dev);
454 /* Send the task management part of the reset. */
455 ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
458 isci_put_device(idev);
463 /* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
464 int isci_task_clear_nexus_port(struct asd_sas_port *port)
466 return TMF_RESP_FUNC_FAILED;
471 int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
473 return TMF_RESP_FUNC_FAILED;
476 /* Task Management Functions. Must be called from process context. */
479 * isci_task_abort_task() - This function is one of the SAS Domain Template
480 * functions. This function is called by libsas to abort a specified task.
481 * @task: This parameter specifies the SAS task to abort.
483 * status, zero indicates success.
485 int isci_task_abort_task(struct sas_task *task)
487 struct isci_host *ihost = dev_to_ihost(task->dev);
488 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
489 struct isci_request *old_request = NULL;
490 struct isci_remote_device *idev = NULL;
492 int ret = TMF_RESP_FUNC_FAILED;
494 int target_done_already = 0;
496 /* Get the isci_request reference from the task. Note that
497 * this check does not depend on the pending request list
498 * in the device, because tasks driving resets may land here
499 * after completion in the core.
501 spin_lock_irqsave(&ihost->scic_lock, flags);
502 spin_lock(&task->task_state_lock);
504 old_request = task->lldd_task;
506 /* If task is already done, the request isn't valid */
507 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
508 (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
510 idev = isci_get_device(task->dev->lldd_dev);
511 target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
512 &old_request->flags);
514 spin_unlock(&task->task_state_lock);
515 spin_unlock_irqrestore(&ihost->scic_lock, flags);
517 dev_warn(&ihost->pdev->dev,
518 "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
520 (dev_is_sata(task->dev) ? "STP/SATA"
521 : ((dev_is_expander(task->dev))
524 ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
530 /* Device reset conditions signalled in task_state_flags are the
531 * responsbility of libsas to observe at the start of the error
534 if (!idev || !old_request) {
535 /* The request has already completed and there
536 * is nothing to do here other than to set the task
537 * done bit, and indicate that the task abort function
540 spin_lock_irqsave(&task->task_state_lock, flags);
541 task->task_state_flags |= SAS_TASK_STATE_DONE;
542 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
543 SAS_TASK_STATE_PENDING);
544 spin_unlock_irqrestore(&task->task_state_lock, flags);
546 ret = TMF_RESP_FUNC_COMPLETE;
548 dev_warn(&ihost->pdev->dev,
549 "%s: abort task not needed for %p\n",
553 /* Suspend the RNC, kill the TC */
554 if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
556 dev_warn(&ihost->pdev->dev,
557 "%s: isci_remote_device_reset_terminate(dev=%p, "
558 "req=%p, task=%p) failed\n",
559 __func__, idev, old_request, task);
560 ret = TMF_RESP_FUNC_FAILED;
563 spin_lock_irqsave(&ihost->scic_lock, flags);
565 if (task->task_proto == SAS_PROTOCOL_SMP ||
566 sas_protocol_ata(task->task_proto) ||
567 target_done_already ||
568 test_bit(IDEV_GONE, &idev->flags)) {
570 spin_unlock_irqrestore(&ihost->scic_lock, flags);
572 /* No task to send, so explicitly resume the device here */
573 isci_remote_device_resume_from_abort(ihost, idev);
575 dev_warn(&ihost->pdev->dev,
577 " or complete_in_target (%d), "
578 "or IDEV_GONE (%d), thus no TMF\n",
580 ((task->task_proto == SAS_PROTOCOL_SMP)
582 : (sas_protocol_ata(task->task_proto)
586 test_bit(IREQ_COMPLETE_IN_TARGET,
587 &old_request->flags),
588 test_bit(IDEV_GONE, &idev->flags));
590 spin_lock_irqsave(&task->task_state_lock, flags);
591 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
592 SAS_TASK_STATE_PENDING);
593 task->task_state_flags |= SAS_TASK_STATE_DONE;
594 spin_unlock_irqrestore(&task->task_state_lock, flags);
596 ret = TMF_RESP_FUNC_COMPLETE;
598 /* Fill in the tmf stucture */
599 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
602 spin_unlock_irqrestore(&ihost->scic_lock, flags);
604 /* Send the task management request. */
605 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
606 ret = isci_task_execute_tmf(ihost, idev, &tmf,
607 ISCI_ABORT_TASK_TIMEOUT_MS);
610 dev_warn(&ihost->pdev->dev,
611 "%s: Done; dev = %p, task = %p , old_request == %p\n",
612 __func__, idev, task, old_request);
613 isci_put_device(idev);
618 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
619 * functions. This is one of the Task Management functoins called by libsas,
620 * to abort all task for the given lun.
621 * @d_device: This parameter specifies the domain device associated with this
623 * @lun: This parameter specifies the lun associated with this request.
625 * status, zero indicates success.
627 int isci_task_abort_task_set(
628 struct domain_device *d_device,
631 return TMF_RESP_FUNC_FAILED;
636 * isci_task_clear_aca() - This function is one of the SAS Domain Template
637 * functions. This is one of the Task Management functoins called by libsas.
638 * @d_device: This parameter specifies the domain device associated with this
640 * @lun: This parameter specifies the lun associated with this request.
642 * status, zero indicates success.
644 int isci_task_clear_aca(
645 struct domain_device *d_device,
648 return TMF_RESP_FUNC_FAILED;
654 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
655 * functions. This is one of the Task Management functoins called by libsas.
656 * @d_device: This parameter specifies the domain device associated with this
658 * @lun: This parameter specifies the lun associated with this request.
660 * status, zero indicates success.
662 int isci_task_clear_task_set(
663 struct domain_device *d_device,
666 return TMF_RESP_FUNC_FAILED;
671 * isci_task_query_task() - This function is implemented to cause libsas to
672 * correctly escalate the failed abort to a LUN or target reset (this is
673 * because sas_scsi_find_task libsas function does not correctly interpret
674 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
675 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
676 * returned, libsas will turn this into a target reset
677 * @task: This parameter specifies the sas task being queried.
678 * @lun: This parameter specifies the lun associated with this request.
680 * status, zero indicates success.
682 int isci_task_query_task(
683 struct sas_task *task)
685 /* See if there is a pending device reset for this device. */
686 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
687 return TMF_RESP_FUNC_FAILED;
689 return TMF_RESP_FUNC_SUCC;
693 * isci_task_request_complete() - This function is called by the sci core when
694 * an task request completes.
695 * @ihost: This parameter specifies the ISCI host object
696 * @ireq: This parameter is the completed isci_request object.
697 * @completion_status: This parameter specifies the completion status from the
703 isci_task_request_complete(struct isci_host *ihost,
704 struct isci_request *ireq,
705 enum sci_task_status completion_status)
707 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
708 struct completion *tmf_complete = NULL;
710 dev_dbg(&ihost->pdev->dev,
711 "%s: request = %p, status=%d\n",
712 __func__, ireq, completion_status);
714 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
717 tmf->status = completion_status;
719 if (tmf->proto == SAS_PROTOCOL_SSP) {
720 memcpy(&tmf->resp.resp_iu,
722 SSP_RESP_IU_MAX_SIZE);
723 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
724 memcpy(&tmf->resp.d2h_fis,
726 sizeof(struct dev_to_host_fis));
728 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
729 tmf_complete = tmf->complete;
731 sci_controller_complete_io(ihost, ireq->target_device, ireq);
732 /* set the 'terminated' flag handle to make sure it cannot be terminated
733 * or completed again.
735 set_bit(IREQ_TERMINATED, &ireq->flags);
737 if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
738 wake_up_all(&ihost->eventq);
740 if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
741 isci_free_tag(ihost, ireq->io_tag);
743 /* The task management part completes last. */
745 complete(tmf_complete);
748 static int isci_reset_device(struct isci_host *ihost,
749 struct domain_device *dev,
750 struct isci_remote_device *idev)
752 int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
753 struct sas_phy *phy = sas_get_local_phy(dev);
754 struct isci_port *iport = dev->port->lldd_port;
756 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
758 /* Suspend the RNC, terminate all outstanding TCs. */
759 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
761 rc = TMF_RESP_FUNC_FAILED;
764 /* Note that since the termination for outstanding requests succeeded,
765 * this function will return success. This is because the resets will
766 * only fail if the device has been removed (ie. hotplug), and the
767 * primary duty of this function is to cleanup tasks, so that is the
770 if (!test_bit(IDEV_GONE, &idev->flags)) {
771 if (scsi_is_sas_phy_local(phy)) {
772 struct isci_phy *iphy = &ihost->phys[phy->number];
774 reset_stat = isci_port_perform_hard_reset(ihost, iport,
777 reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
779 /* Explicitly resume the RNC here, since there was no task sent. */
780 isci_remote_device_resume_from_abort(ihost, idev);
782 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
783 __func__, idev, reset_stat);
785 sas_put_local_phy(phy);
789 int isci_task_I_T_nexus_reset(struct domain_device *dev)
791 struct isci_host *ihost = dev_to_ihost(dev);
792 struct isci_remote_device *idev;
796 spin_lock_irqsave(&ihost->scic_lock, flags);
797 idev = isci_get_device(dev->lldd_dev);
798 spin_unlock_irqrestore(&ihost->scic_lock, flags);
801 /* XXX: need to cleanup any ireqs targeting this
804 ret = TMF_RESP_FUNC_COMPLETE;
808 ret = isci_reset_device(ihost, dev, idev);
810 isci_put_device(idev);