2 * This file is provided under a dual BSD/GPLv2 license. When using or
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9 * This program is free software; you can redistribute it and/or modify
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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"
69 * isci_task_refuse() - complete the request to the upper layer driver in
70 * the case where an I/O needs to be completed back in the submit path.
71 * @ihost: host on which the the request was queued
72 * @task: request to complete
73 * @response: response code for the completed task.
74 * @status: status code for the completed task.
77 static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
78 enum service_response response,
79 enum exec_status status)
82 enum isci_completion_selection disposition;
84 disposition = isci_perform_normal_io_completion;
85 disposition = isci_task_set_completion_status(task, response, status,
88 /* Tasks aborted specifically by a call to the lldd_abort_task
89 * function should not be completed to the host in the regular path.
91 switch (disposition) {
92 case isci_perform_normal_io_completion:
93 /* Normal notification (task_done) */
94 dev_dbg(&ihost->pdev->dev,
95 "%s: Normal - task = %p, response=%d, "
97 __func__, task, response, status);
99 task->lldd_task = NULL;
101 isci_execpath_callback(ihost, task, task->task_done);
104 case isci_perform_aborted_io_completion:
105 /* No notification because this request is already in the
108 dev_warn(&ihost->pdev->dev,
109 "%s: Aborted - task = %p, response=%d, "
111 __func__, task, response, status);
114 case isci_perform_error_io_completion:
115 /* Use sas_task_abort */
116 dev_warn(&ihost->pdev->dev,
117 "%s: Error - task = %p, response=%d, "
119 __func__, task, response, status);
121 isci_execpath_callback(ihost, task, sas_task_abort);
125 dev_warn(&ihost->pdev->dev,
126 "%s: isci task notification default case!",
128 sas_task_abort(task);
133 #define for_each_sas_task(num, task) \
134 for (; num > 0; num--,\
135 task = list_entry(task->list.next, struct sas_task, list))
138 static inline int isci_device_io_ready(struct isci_remote_device *idev,
139 struct sas_task *task)
141 return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
142 (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
143 isci_task_is_ncq_recovery(task))
147 * isci_task_execute_task() - This function is one of the SAS Domain Template
148 * functions. This function is called by libsas to send a task down to
150 * @task: This parameter specifies the SAS task to send.
151 * @num: This parameter specifies the number of tasks to queue.
152 * @gfp_flags: This parameter specifies the context of this call.
154 * status, zero indicates success.
156 int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
158 struct isci_host *ihost = dev_to_ihost(task->dev);
159 struct isci_remote_device *idev;
164 dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
166 for_each_sas_task(num, task) {
167 enum sci_status status = SCI_FAILURE;
169 spin_lock_irqsave(&ihost->scic_lock, flags);
170 idev = isci_lookup_device(task->dev);
171 io_ready = isci_device_io_ready(idev, task);
172 tag = isci_alloc_tag(ihost);
173 spin_unlock_irqrestore(&ihost->scic_lock, flags);
175 dev_dbg(&ihost->pdev->dev,
176 "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
177 task, num, task->dev, idev, idev ? idev->flags : 0,
181 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
183 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
184 /* Indicate QUEUE_FULL so that the scsi midlayer
187 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
190 /* There is a device and it's ready for I/O. */
191 spin_lock_irqsave(&task->task_state_lock, flags);
193 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
194 /* The I/O was aborted. */
195 spin_unlock_irqrestore(&task->task_state_lock,
198 isci_task_refuse(ihost, task,
199 SAS_TASK_UNDELIVERED,
200 SAM_STAT_TASK_ABORTED);
202 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
203 spin_unlock_irqrestore(&task->task_state_lock, flags);
205 /* build and send the request. */
206 status = isci_request_execute(ihost, idev, task, tag, gfp_flags);
208 if (status != SCI_SUCCESS) {
210 spin_lock_irqsave(&task->task_state_lock, flags);
211 /* Did not really start this command. */
212 task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
213 spin_unlock_irqrestore(&task->task_state_lock, flags);
215 /* Indicate QUEUE_FULL so that the scsi
216 * midlayer retries. if the request
217 * failed for remote device reasons,
218 * it gets returned as
219 * SAS_TASK_UNDELIVERED next time
222 isci_task_refuse(ihost, task,
228 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
229 spin_lock_irqsave(&ihost->scic_lock, flags);
230 /* command never hit the device, so just free
231 * the tci and skip the sequence increment
233 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
234 spin_unlock_irqrestore(&ihost->scic_lock, flags);
236 isci_put_device(idev);
241 static struct isci_request *isci_task_request_build(struct isci_host *ihost,
242 struct isci_remote_device *idev,
243 u16 tag, struct isci_tmf *isci_tmf)
245 enum sci_status status = SCI_FAILURE;
246 struct isci_request *ireq = NULL;
247 struct domain_device *dev;
249 dev_dbg(&ihost->pdev->dev,
250 "%s: isci_tmf = %p\n", __func__, isci_tmf);
252 dev = idev->domain_dev;
254 /* do common allocation and init of request object. */
255 ireq = isci_request_alloc_tmf(ihost, isci_tmf, GFP_ATOMIC);
259 /* let the core do it's construct. */
260 status = scic_task_request_construct(&ihost->sci, &idev->sci, tag,
263 if (status != SCI_SUCCESS) {
264 dev_warn(&ihost->pdev->dev,
265 "%s: scic_task_request_construct failed - "
272 /* XXX convert to get this from task->tproto like other drivers */
273 if (dev->dev_type == SAS_END_DEV) {
274 isci_tmf->proto = SAS_PROTOCOL_SSP;
275 status = scic_task_request_construct_ssp(&ireq->sci);
276 if (status != SCI_SUCCESS)
280 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
281 isci_tmf->proto = SAS_PROTOCOL_SATA;
282 status = isci_sata_management_task_request_build(ireq);
284 if (status != SCI_SUCCESS)
289 isci_request_free(ihost, ireq);
293 int isci_task_execute_tmf(struct isci_host *ihost,
294 struct isci_remote_device *isci_device,
295 struct isci_tmf *tmf, unsigned long timeout_ms)
297 DECLARE_COMPLETION_ONSTACK(completion);
298 enum sci_task_status status = SCI_TASK_FAILURE;
299 struct scic_sds_remote_device *sci_device;
300 struct isci_request *ireq;
301 int ret = TMF_RESP_FUNC_FAILED;
303 unsigned long timeleft;
306 spin_lock_irqsave(&ihost->scic_lock, flags);
307 tag = isci_alloc_tag(ihost);
308 spin_unlock_irqrestore(&ihost->scic_lock, flags);
310 if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
313 /* sanity check, return TMF_RESP_FUNC_FAILED
314 * if the device is not there and ready.
317 (!test_bit(IDEV_IO_READY, &isci_device->flags) &&
318 !test_bit(IDEV_IO_NCQERROR, &isci_device->flags))) {
319 dev_dbg(&ihost->pdev->dev,
320 "%s: isci_device = %p not ready (%#lx)\n",
322 isci_device, isci_device ? isci_device->flags : 0);
325 dev_dbg(&ihost->pdev->dev,
326 "%s: isci_device = %p\n",
327 __func__, isci_device);
329 sci_device = &isci_device->sci;
331 /* Assign the pointer to the TMF's completion kernel wait structure. */
332 tmf->complete = &completion;
334 ireq = isci_task_request_build(ihost, isci_device, tag, tmf);
338 spin_lock_irqsave(&ihost->scic_lock, flags);
340 /* start the TMF io. */
341 status = scic_controller_start_task(&ihost->sci,
345 if (status != SCI_TASK_SUCCESS) {
346 dev_warn(&ihost->pdev->dev,
347 "%s: start_io failed - status = 0x%x, request = %p\n",
351 spin_unlock_irqrestore(&ihost->scic_lock, flags);
355 if (tmf->cb_state_func != NULL)
356 tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
358 isci_request_change_state(ireq, started);
360 /* add the request to the remote device request list. */
361 list_add(&ireq->dev_node, &isci_device->reqs_in_process);
363 spin_unlock_irqrestore(&ihost->scic_lock, flags);
365 /* Wait for the TMF to complete, or a timeout. */
366 timeleft = wait_for_completion_timeout(&completion,
367 msecs_to_jiffies(timeout_ms));
370 spin_lock_irqsave(&ihost->scic_lock, flags);
372 if (tmf->cb_state_func != NULL)
373 tmf->cb_state_func(isci_tmf_timed_out, tmf, tmf->cb_data);
375 scic_controller_terminate_request(&ihost->sci,
379 spin_unlock_irqrestore(&ihost->scic_lock, flags);
381 wait_for_completion(tmf->complete);
386 if (tmf->status == SCI_SUCCESS)
387 ret = TMF_RESP_FUNC_COMPLETE;
388 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
389 dev_dbg(&ihost->pdev->dev,
391 "SCI_FAILURE_IO_RESPONSE_VALID\n",
393 ret = TMF_RESP_FUNC_COMPLETE;
395 /* Else - leave the default "failed" status alone. */
397 dev_dbg(&ihost->pdev->dev,
398 "%s: completed request = %p\n",
405 isci_request_free(ihost, ireq);
407 spin_lock_irqsave(&ihost->scic_lock, flags);
408 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
409 spin_unlock_irqrestore(&ihost->scic_lock, flags);
414 void isci_task_build_tmf(
415 struct isci_tmf *tmf,
416 enum isci_tmf_function_codes code,
417 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
422 memset(tmf, 0, sizeof(*tmf));
424 tmf->tmf_code = code;
425 tmf->cb_state_func = tmf_sent_cb;
426 tmf->cb_data = cb_data;
429 static void isci_task_build_abort_task_tmf(
430 struct isci_tmf *tmf,
431 enum isci_tmf_function_codes code,
432 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
435 struct isci_request *old_request)
437 isci_task_build_tmf(tmf, code, tmf_sent_cb,
438 (void *)old_request);
439 tmf->io_tag = old_request->io_tag;
443 * isci_task_validate_request_to_abort() - This function checks the given I/O
444 * against the "started" state. If the request is still "started", it's
445 * state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
446 * BEFORE CALLING THIS FUNCTION.
447 * @isci_request: This parameter specifies the request object to control.
448 * @isci_host: This parameter specifies the ISCI host object
449 * @isci_device: This is the device to which the request is pending.
450 * @aborted_io_completion: This is a completion structure that will be added to
451 * the request in case it is changed to aborting; this completion is
452 * triggered when the request is fully completed.
454 * Either "started" on successful change of the task status to "aborted", or
455 * "unallocated" if the task cannot be controlled.
457 static enum isci_request_status isci_task_validate_request_to_abort(
458 struct isci_request *isci_request,
459 struct isci_host *isci_host,
460 struct isci_remote_device *isci_device,
461 struct completion *aborted_io_completion)
463 enum isci_request_status old_state = unallocated;
465 /* Only abort the task if it's in the
466 * device's request_in_process list
468 if (isci_request && !list_empty(&isci_request->dev_node)) {
469 old_state = isci_request_change_started_to_aborted(
470 isci_request, aborted_io_completion);
478 * isci_request_cleanup_completed_loiterer() - This function will take care of
479 * the final cleanup on any request which has been explicitly terminated.
480 * @isci_host: This parameter specifies the ISCI host object
481 * @isci_device: This is the device to which the request is pending.
482 * @isci_request: This parameter specifies the terminated request object.
483 * @task: This parameter is the libsas I/O request.
485 static void isci_request_cleanup_completed_loiterer(
486 struct isci_host *isci_host,
487 struct isci_remote_device *isci_device,
488 struct isci_request *isci_request,
489 struct sas_task *task)
493 dev_dbg(&isci_host->pdev->dev,
494 "%s: isci_device=%p, request=%p, task=%p\n",
495 __func__, isci_device, isci_request, task);
499 spin_lock_irqsave(&task->task_state_lock, flags);
500 task->lldd_task = NULL;
502 task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
504 isci_set_task_doneflags(task);
506 /* If this task is not in the abort path, call task_done. */
507 if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
509 spin_unlock_irqrestore(&task->task_state_lock, flags);
510 task->task_done(task);
512 spin_unlock_irqrestore(&task->task_state_lock, flags);
515 if (isci_request != NULL) {
516 spin_lock_irqsave(&isci_host->scic_lock, flags);
517 list_del_init(&isci_request->dev_node);
518 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
520 isci_request_free(isci_host, isci_request);
525 * isci_terminate_request_core() - This function will terminate the given
526 * request, and wait for it to complete. This function must only be called
527 * from a thread that can wait. Note that the request is terminated and
528 * completed (back to the host, if started there).
529 * @isci_host: This SCU.
530 * @isci_device: The target.
531 * @isci_request: The I/O request to be terminated.
534 static void isci_terminate_request_core(
535 struct isci_host *isci_host,
536 struct isci_remote_device *isci_device,
537 struct isci_request *isci_request)
539 enum sci_status status = SCI_SUCCESS;
540 bool was_terminated = false;
541 bool needs_cleanup_handling = false;
542 enum isci_request_status request_status;
544 unsigned long termination_completed = 1;
545 struct completion *io_request_completion;
546 struct sas_task *task;
548 dev_dbg(&isci_host->pdev->dev,
549 "%s: device = %p; request = %p\n",
550 __func__, isci_device, isci_request);
552 spin_lock_irqsave(&isci_host->scic_lock, flags);
554 io_request_completion = isci_request->io_request_completion;
556 task = (isci_request->ttype == io_task)
557 ? isci_request_access_task(isci_request)
560 /* Note that we are not going to control
561 * the target to abort the request.
563 set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->flags);
565 /* Make sure the request wasn't just sitting around signalling
566 * device condition (if the request handle is NULL, then the
567 * request completed but needed additional handling here).
569 if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
570 was_terminated = true;
571 needs_cleanup_handling = true;
572 status = scic_controller_terminate_request(
577 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
580 * The only time the request to terminate will
581 * fail is when the io request is completed and
584 if (status != SCI_SUCCESS) {
585 dev_err(&isci_host->pdev->dev,
586 "%s: scic_controller_terminate_request"
587 " returned = 0x%x\n",
590 isci_request->io_request_completion = NULL;
593 if (was_terminated) {
594 dev_dbg(&isci_host->pdev->dev,
595 "%s: before completion wait (%p/%p)\n",
596 __func__, isci_request, io_request_completion);
598 /* Wait here for the request to complete. */
599 #define TERMINATION_TIMEOUT_MSEC 500
600 termination_completed
601 = wait_for_completion_timeout(
602 io_request_completion,
603 msecs_to_jiffies(TERMINATION_TIMEOUT_MSEC));
605 if (!termination_completed) {
607 /* The request to terminate has timed out. */
608 spin_lock_irqsave(&isci_host->scic_lock,
611 /* Check for state changes. */
612 if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
614 /* The best we can do is to have the
615 * request die a silent death if it
616 * ever really completes.
618 * Set the request state to "dead",
619 * and clear the task pointer so that
620 * an actual completion event callback
621 * doesn't do anything.
623 isci_request->status = dead;
624 isci_request->io_request_completion
627 if (isci_request->ttype == io_task) {
629 /* Break links with the
632 isci_request->ttype_ptr.io_task_ptr
636 termination_completed = 1;
638 spin_unlock_irqrestore(&isci_host->scic_lock,
641 if (!termination_completed) {
643 dev_err(&isci_host->pdev->dev,
644 "%s: *** Timeout waiting for "
645 "termination(%p/%p)\n",
646 __func__, io_request_completion,
649 /* The request can no longer be referenced
650 * safely since it may go away if the
651 * termination every really does complete.
656 if (termination_completed)
657 dev_dbg(&isci_host->pdev->dev,
658 "%s: after completion wait (%p/%p)\n",
659 __func__, isci_request, io_request_completion);
662 if (termination_completed) {
664 isci_request->io_request_completion = NULL;
666 /* Peek at the status of the request. This will tell
667 * us if there was special handling on the request such that it
668 * needs to be detached and freed here.
670 spin_lock_irqsave(&isci_request->state_lock, flags);
671 request_status = isci_request_get_state(isci_request);
673 if ((isci_request->ttype == io_task) /* TMFs are in their own thread */
674 && ((request_status == aborted)
675 || (request_status == aborting)
676 || (request_status == terminating)
677 || (request_status == completed)
678 || (request_status == dead)
682 /* The completion routine won't free a request in
683 * the aborted/aborting/etc. states, so we do
686 needs_cleanup_handling = true;
688 spin_unlock_irqrestore(&isci_request->state_lock, flags);
691 if (needs_cleanup_handling)
692 isci_request_cleanup_completed_loiterer(
693 isci_host, isci_device, isci_request, task);
698 * isci_terminate_pending_requests() - This function will change the all of the
699 * requests on the given device's state to "aborting", will terminate the
700 * requests, and wait for them to complete. This function must only be
701 * called from a thread that can wait. Note that the requests are all
702 * terminated and completed (back to the host, if started there).
703 * @isci_host: This parameter specifies SCU.
704 * @isci_device: This parameter specifies the target.
707 void isci_terminate_pending_requests(struct isci_host *ihost,
708 struct isci_remote_device *idev)
710 struct completion request_completion;
711 enum isci_request_status old_state;
715 spin_lock_irqsave(&ihost->scic_lock, flags);
716 list_splice_init(&idev->reqs_in_process, &list);
718 /* assumes that isci_terminate_request_core deletes from the list */
719 while (!list_empty(&list)) {
720 struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
722 /* Change state to "terminating" if it is currently
725 old_state = isci_request_change_started_to_newstate(ireq,
734 /* termination in progress, or otherwise dispositioned.
735 * We know the request was on 'list' so should be safe
736 * to move it back to reqs_in_process
738 list_move(&ireq->dev_node, &idev->reqs_in_process);
745 spin_unlock_irqrestore(&ihost->scic_lock, flags);
747 init_completion(&request_completion);
749 dev_dbg(&ihost->pdev->dev,
750 "%s: idev=%p request=%p; task=%p old_state=%d\n",
751 __func__, idev, ireq,
752 ireq->ttype == io_task ? isci_request_access_task(ireq) : NULL,
755 /* If the old_state is started:
756 * This request was not already being aborted. If it had been,
757 * then the aborting I/O (ie. the TMF request) would not be in
758 * the aborting state, and thus would be terminated here. Note
759 * that since the TMF completion's call to the kernel function
760 * "complete()" does not happen until the pending I/O request
761 * terminate fully completes, we do not have to implement a
762 * special wait here for already aborting requests - the
763 * termination of the TMF request will force the request
764 * to finish it's already started terminate.
766 * If old_state == completed:
767 * This request completed from the SCU hardware perspective
768 * and now just needs cleaning up in terms of freeing the
769 * request and potentially calling up to libsas.
771 * If old_state == aborting:
772 * This request has already gone through a TMF timeout, but may
773 * not have been terminated; needs cleaning up at least.
775 isci_terminate_request_core(ihost, idev, ireq);
776 spin_lock_irqsave(&ihost->scic_lock, flags);
778 spin_unlock_irqrestore(&ihost->scic_lock, flags);
782 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
783 * Template functions.
784 * @lun: This parameter specifies the lun to be reset.
786 * status, zero indicates success.
788 static int isci_task_send_lu_reset_sas(
789 struct isci_host *isci_host,
790 struct isci_remote_device *isci_device,
794 int ret = TMF_RESP_FUNC_FAILED;
796 dev_dbg(&isci_host->pdev->dev,
797 "%s: isci_host = %p, isci_device = %p\n",
798 __func__, isci_host, isci_device);
799 /* Send the LUN reset to the target. By the time the call returns,
800 * the TMF has fully exected in the target (in which case the return
801 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
802 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
804 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL);
806 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
807 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
809 if (ret == TMF_RESP_FUNC_COMPLETE)
810 dev_dbg(&isci_host->pdev->dev,
811 "%s: %p: TMF_LU_RESET passed\n",
812 __func__, isci_device);
814 dev_dbg(&isci_host->pdev->dev,
815 "%s: %p: TMF_LU_RESET failed (%x)\n",
816 __func__, isci_device, ret);
822 * isci_task_lu_reset() - This function is one of the SAS Domain Template
823 * functions. This is one of the Task Management functoins called by libsas,
824 * to reset the given lun. Note the assumption that while this call is
825 * executing, no I/O will be sent by the host to the device.
826 * @lun: This parameter specifies the lun to be reset.
828 * status, zero indicates success.
830 int isci_task_lu_reset(struct domain_device *domain_device, u8 *lun)
832 struct isci_host *isci_host = dev_to_ihost(domain_device);
833 struct isci_remote_device *isci_device;
837 spin_lock_irqsave(&isci_host->scic_lock, flags);
838 isci_device = isci_lookup_device(domain_device);
839 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
841 dev_dbg(&isci_host->pdev->dev,
842 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
843 __func__, domain_device, isci_host, isci_device);
846 set_bit(IDEV_EH, &isci_device->flags);
848 /* If there is a device reset pending on any request in the
849 * device's list, fail this LUN reset request in order to
850 * escalate to the device reset.
853 isci_device_is_reset_pending(isci_host, isci_device)) {
854 dev_warn(&isci_host->pdev->dev,
855 "%s: No dev (%p), or "
856 "RESET PENDING: domain_device=%p\n",
857 __func__, isci_device, domain_device);
858 ret = TMF_RESP_FUNC_FAILED;
862 /* Send the task management part of the reset. */
863 if (sas_protocol_ata(domain_device->tproto)) {
864 ret = isci_task_send_lu_reset_sata(isci_host, isci_device, lun);
866 ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
868 /* If the LUN reset worked, all the I/O can now be terminated. */
869 if (ret == TMF_RESP_FUNC_COMPLETE)
870 /* Terminate all I/O now. */
871 isci_terminate_pending_requests(isci_host,
875 isci_put_device(isci_device);
880 /* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
881 int isci_task_clear_nexus_port(struct asd_sas_port *port)
883 return TMF_RESP_FUNC_FAILED;
888 int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
890 return TMF_RESP_FUNC_FAILED;
893 /* Task Management Functions. Must be called from process context. */
896 * isci_abort_task_process_cb() - This is a helper function for the abort task
897 * TMF command. It manages the request state with respect to the successful
898 * transmission / completion of the abort task request.
899 * @cb_state: This parameter specifies when this function was called - after
900 * the TMF request has been started and after it has timed-out.
901 * @tmf: This parameter specifies the TMF in progress.
905 static void isci_abort_task_process_cb(
906 enum isci_tmf_cb_state cb_state,
907 struct isci_tmf *tmf,
910 struct isci_request *old_request;
912 old_request = (struct isci_request *)cb_data;
914 dev_dbg(&old_request->isci_host->pdev->dev,
915 "%s: tmf=%p, old_request=%p\n",
916 __func__, tmf, old_request);
920 case isci_tmf_started:
921 /* The TMF has been started. Nothing to do here, since the
922 * request state was already set to "aborted" by the abort
925 if ((old_request->status != aborted)
926 && (old_request->status != completed))
927 dev_err(&old_request->isci_host->pdev->dev,
928 "%s: Bad request status (%d): tmf=%p, old_request=%p\n",
929 __func__, old_request->status, tmf, old_request);
932 case isci_tmf_timed_out:
934 /* Set the task's state to "aborting", since the abort task
935 * function thread set it to "aborted" (above) in anticipation
936 * of the task management request working correctly. Since the
937 * timeout has now fired, the TMF request failed. We set the
938 * state such that the request completion will indicate the
939 * device is no longer present.
941 isci_request_change_state(old_request, aborting);
945 dev_err(&old_request->isci_host->pdev->dev,
946 "%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
947 __func__, cb_state, tmf, old_request);
953 * isci_task_abort_task() - This function is one of the SAS Domain Template
954 * functions. This function is called by libsas to abort a specified task.
955 * @task: This parameter specifies the SAS task to abort.
957 * status, zero indicates success.
959 int isci_task_abort_task(struct sas_task *task)
961 struct isci_host *isci_host = dev_to_ihost(task->dev);
962 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
963 struct isci_request *old_request = NULL;
964 enum isci_request_status old_state;
965 struct isci_remote_device *isci_device = NULL;
967 int ret = TMF_RESP_FUNC_FAILED;
969 bool any_dev_reset = false;
971 /* Get the isci_request reference from the task. Note that
972 * this check does not depend on the pending request list
973 * in the device, because tasks driving resets may land here
974 * after completion in the core.
976 spin_lock_irqsave(&isci_host->scic_lock, flags);
977 spin_lock(&task->task_state_lock);
979 old_request = task->lldd_task;
981 /* If task is already done, the request isn't valid */
982 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
983 (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
985 isci_device = isci_lookup_device(task->dev);
987 spin_unlock(&task->task_state_lock);
988 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
990 dev_dbg(&isci_host->pdev->dev,
991 "%s: task = %p\n", __func__, task);
993 if (!isci_device || !old_request)
996 set_bit(IDEV_EH, &isci_device->flags);
998 /* This version of the driver will fail abort requests for
999 * SATA/STP. Failing the abort request this way will cause the
1000 * SCSI error handler thread to escalate to LUN reset
1002 if (sas_protocol_ata(task->task_proto)) {
1003 dev_warn(&isci_host->pdev->dev,
1004 " task %p is for a STP/SATA device;"
1005 " returning TMF_RESP_FUNC_FAILED\n"
1006 " to cause a LUN reset...\n", task);
1010 dev_dbg(&isci_host->pdev->dev,
1011 "%s: old_request == %p\n", __func__, old_request);
1013 any_dev_reset = isci_device_is_reset_pending(isci_host,isci_device);
1015 spin_lock_irqsave(&task->task_state_lock, flags);
1017 any_dev_reset = any_dev_reset || (task->task_state_flags & SAS_TASK_NEED_DEV_RESET);
1019 /* If the extraction of the request reference from the task
1020 * failed, then the request has been completed (or if there is a
1021 * pending reset then this abort request function must be failed
1022 * in order to escalate to the target reset).
1024 if ((old_request == NULL) || any_dev_reset) {
1026 /* If the device reset task flag is set, fail the task
1027 * management request. Otherwise, the original request
1030 if (any_dev_reset) {
1032 /* Turn off the task's DONE to make sure this
1033 * task is escalated to a target reset.
1035 task->task_state_flags &= ~SAS_TASK_STATE_DONE;
1037 /* Make the reset happen as soon as possible. */
1038 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
1040 spin_unlock_irqrestore(&task->task_state_lock, flags);
1042 /* Fail the task management request in order to
1043 * escalate to the target reset.
1045 ret = TMF_RESP_FUNC_FAILED;
1047 dev_dbg(&isci_host->pdev->dev,
1048 "%s: Failing task abort in order to "
1049 "escalate to target reset because\n"
1050 "SAS_TASK_NEED_DEV_RESET is set for "
1051 "task %p on dev %p\n",
1052 __func__, task, isci_device);
1056 /* The request has already completed and there
1057 * is nothing to do here other than to set the task
1058 * done bit, and indicate that the task abort function
1061 isci_set_task_doneflags(task);
1063 spin_unlock_irqrestore(&task->task_state_lock, flags);
1065 ret = TMF_RESP_FUNC_COMPLETE;
1067 dev_dbg(&isci_host->pdev->dev,
1068 "%s: abort task not needed for %p\n",
1074 spin_unlock_irqrestore(&task->task_state_lock, flags);
1076 spin_lock_irqsave(&isci_host->scic_lock, flags);
1078 /* Check the request status and change to "aborted" if currently
1079 * "starting"; if true then set the I/O kernel completion
1080 * struct that will be triggered when the request completes.
1082 old_state = isci_task_validate_request_to_abort(
1083 old_request, isci_host, isci_device,
1084 &aborted_io_completion);
1085 if ((old_state != started) &&
1086 (old_state != completed) &&
1087 (old_state != aborting)) {
1089 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1091 /* The request was already being handled by someone else (because
1092 * they got to set the state away from started).
1094 dev_dbg(&isci_host->pdev->dev,
1095 "%s: device = %p; old_request %p already being aborted\n",
1097 isci_device, old_request);
1098 ret = TMF_RESP_FUNC_COMPLETE;
1101 if (task->task_proto == SAS_PROTOCOL_SMP ||
1102 test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
1104 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1106 dev_dbg(&isci_host->pdev->dev,
1107 "%s: SMP request (%d)"
1108 " or complete_in_target (%d), thus no TMF\n",
1109 __func__, (task->task_proto == SAS_PROTOCOL_SMP),
1110 test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
1112 /* Set the state on the task. */
1113 isci_task_all_done(task);
1115 ret = TMF_RESP_FUNC_COMPLETE;
1117 /* Stopping and SMP devices are not sent a TMF, and are not
1118 * reset, but the outstanding I/O request is terminated below.
1121 /* Fill in the tmf stucture */
1122 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
1123 isci_abort_task_process_cb,
1126 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1128 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* half second timeout. */
1129 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
1130 ISCI_ABORT_TASK_TIMEOUT_MS);
1132 if (ret != TMF_RESP_FUNC_COMPLETE)
1133 dev_err(&isci_host->pdev->dev,
1134 "%s: isci_task_send_tmf failed\n",
1137 if (ret == TMF_RESP_FUNC_COMPLETE) {
1138 set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
1140 /* Clean up the request on our side, and wait for the aborted
1143 isci_terminate_request_core(isci_host, isci_device, old_request);
1146 /* Make sure we do not leave a reference to aborted_io_completion */
1147 old_request->io_request_completion = NULL;
1149 isci_put_device(isci_device);
1154 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
1155 * functions. This is one of the Task Management functoins called by libsas,
1156 * to abort all task for the given lun.
1157 * @d_device: This parameter specifies the domain device associated with this
1159 * @lun: This parameter specifies the lun associated with this request.
1161 * status, zero indicates success.
1163 int isci_task_abort_task_set(
1164 struct domain_device *d_device,
1167 return TMF_RESP_FUNC_FAILED;
1172 * isci_task_clear_aca() - This function is one of the SAS Domain Template
1173 * functions. This is one of the Task Management functoins called by libsas.
1174 * @d_device: This parameter specifies the domain device associated with this
1176 * @lun: This parameter specifies the lun associated with this request.
1178 * status, zero indicates success.
1180 int isci_task_clear_aca(
1181 struct domain_device *d_device,
1184 return TMF_RESP_FUNC_FAILED;
1190 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
1191 * functions. This is one of the Task Management functoins called by libsas.
1192 * @d_device: This parameter specifies the domain device associated with this
1194 * @lun: This parameter specifies the lun associated with this request.
1196 * status, zero indicates success.
1198 int isci_task_clear_task_set(
1199 struct domain_device *d_device,
1202 return TMF_RESP_FUNC_FAILED;
1207 * isci_task_query_task() - This function is implemented to cause libsas to
1208 * correctly escalate the failed abort to a LUN or target reset (this is
1209 * because sas_scsi_find_task libsas function does not correctly interpret
1210 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
1211 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
1212 * returned, libsas will turn this into a target reset
1213 * @task: This parameter specifies the sas task being queried.
1214 * @lun: This parameter specifies the lun associated with this request.
1216 * status, zero indicates success.
1218 int isci_task_query_task(
1219 struct sas_task *task)
1221 /* See if there is a pending device reset for this device. */
1222 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
1223 return TMF_RESP_FUNC_FAILED;
1225 return TMF_RESP_FUNC_SUCC;
1229 * isci_task_request_complete() - This function is called by the sci core when
1230 * an task request completes.
1231 * @ihost: This parameter specifies the ISCI host object
1232 * @ireq: This parameter is the completed isci_request object.
1233 * @completion_status: This parameter specifies the completion status from the
1239 isci_task_request_complete(struct isci_host *ihost,
1240 struct isci_request *ireq,
1241 enum sci_task_status completion_status)
1243 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
1244 struct completion *tmf_complete;
1245 struct scic_sds_request *sci_req = &ireq->sci;
1247 dev_dbg(&ihost->pdev->dev,
1248 "%s: request = %p, status=%d\n",
1249 __func__, ireq, completion_status);
1251 isci_request_change_state(ireq, completed);
1253 tmf->status = completion_status;
1254 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
1256 if (tmf->proto == SAS_PROTOCOL_SSP) {
1257 memcpy(&tmf->resp.resp_iu,
1259 SSP_RESP_IU_MAX_SIZE);
1260 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
1261 memcpy(&tmf->resp.d2h_fis,
1263 sizeof(struct dev_to_host_fis));
1266 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
1267 tmf_complete = tmf->complete;
1269 scic_controller_complete_io(&ihost->sci, ireq->sci.target_device, &ireq->sci);
1270 /* set the 'terminated' flag handle to make sure it cannot be terminated
1271 * or completed again.
1273 set_bit(IREQ_TERMINATED, &ireq->flags);
1275 isci_request_change_state(ireq, unallocated);
1276 list_del_init(&ireq->dev_node);
1278 /* The task management part completes last. */
1279 complete(tmf_complete);
1282 static void isci_smp_task_timedout(unsigned long _task)
1284 struct sas_task *task = (void *) _task;
1285 unsigned long flags;
1287 spin_lock_irqsave(&task->task_state_lock, flags);
1288 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1289 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1290 spin_unlock_irqrestore(&task->task_state_lock, flags);
1292 complete(&task->completion);
1295 static void isci_smp_task_done(struct sas_task *task)
1297 if (!del_timer(&task->timer))
1299 complete(&task->completion);
1302 static struct sas_task *isci_alloc_task(void)
1304 struct sas_task *task = kzalloc(sizeof(*task), GFP_KERNEL);
1307 INIT_LIST_HEAD(&task->list);
1308 spin_lock_init(&task->task_state_lock);
1309 task->task_state_flags = SAS_TASK_STATE_PENDING;
1310 init_timer(&task->timer);
1311 init_completion(&task->completion);
1317 static void isci_free_task(struct isci_host *ihost, struct sas_task *task)
1320 BUG_ON(!list_empty(&task->list));
1325 static int isci_smp_execute_task(struct isci_host *ihost,
1326 struct domain_device *dev, void *req,
1327 int req_size, void *resp, int resp_size)
1330 struct sas_task *task = NULL;
1332 for (retry = 0; retry < 3; retry++) {
1333 task = isci_alloc_task();
1338 task->task_proto = dev->tproto;
1339 sg_init_one(&task->smp_task.smp_req, req, req_size);
1340 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
1342 task->task_done = isci_smp_task_done;
1344 task->timer.data = (unsigned long) task;
1345 task->timer.function = isci_smp_task_timedout;
1346 task->timer.expires = jiffies + 10*HZ;
1347 add_timer(&task->timer);
1349 res = isci_task_execute_task(task, 1, GFP_KERNEL);
1352 del_timer(&task->timer);
1353 dev_err(&ihost->pdev->dev,
1354 "%s: executing SMP task failed:%d\n",
1359 wait_for_completion(&task->completion);
1361 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1362 dev_err(&ihost->pdev->dev,
1363 "%s: smp task timed out or aborted\n",
1365 isci_task_abort_task(task);
1366 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1367 dev_err(&ihost->pdev->dev,
1368 "%s: SMP task aborted and not done\n",
1373 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1374 task->task_status.stat == SAM_STAT_GOOD) {
1378 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1379 task->task_status.stat == SAS_DATA_UNDERRUN) {
1380 /* no error, but return the number of bytes of
1382 res = task->task_status.residual;
1385 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1386 task->task_status.stat == SAS_DATA_OVERRUN) {
1390 dev_err(&ihost->pdev->dev,
1391 "%s: task to dev %016llx response: 0x%x "
1392 "status 0x%x\n", __func__,
1393 SAS_ADDR(dev->sas_addr),
1394 task->task_status.resp,
1395 task->task_status.stat);
1396 isci_free_task(ihost, task);
1401 BUG_ON(retry == 3 && task != NULL);
1402 isci_free_task(ihost, task);
1406 #define DISCOVER_REQ_SIZE 16
1407 #define DISCOVER_RESP_SIZE 56
1409 int isci_smp_get_phy_attached_dev_type(struct isci_host *ihost,
1410 struct domain_device *dev,
1411 int phy_id, int *adt)
1413 struct smp_resp *disc_resp;
1417 disc_resp = kzalloc(DISCOVER_RESP_SIZE, GFP_KERNEL);
1421 disc_req = kzalloc(DISCOVER_REQ_SIZE, GFP_KERNEL);
1423 disc_req[0] = SMP_REQUEST;
1424 disc_req[1] = SMP_DISCOVER;
1425 disc_req[9] = phy_id;
1430 res = isci_smp_execute_task(ihost, dev, disc_req, DISCOVER_REQ_SIZE,
1431 disc_resp, DISCOVER_RESP_SIZE);
1433 if (disc_resp->result != SMP_RESP_FUNC_ACC)
1434 res = disc_resp->result;
1436 *adt = disc_resp->disc.attached_dev_type;
1444 static void isci_wait_for_smp_phy_reset(struct isci_remote_device *idev, int phy_num)
1446 struct domain_device *dev = idev->domain_dev;
1447 struct isci_port *iport = idev->isci_port;
1448 struct isci_host *ihost = iport->isci_host;
1449 int res, iteration = 0, attached_device_type;
1450 #define STP_WAIT_MSECS 25000
1451 unsigned long tmo = msecs_to_jiffies(STP_WAIT_MSECS);
1452 unsigned long deadline = jiffies + tmo;
1454 SMP_PHYWAIT_PHYDOWN,
1457 } phy_state = SMP_PHYWAIT_PHYDOWN;
1459 /* While there is time, wait for the phy to go away and come back */
1460 while (time_is_after_jiffies(deadline) && phy_state != SMP_PHYWAIT_DONE) {
1461 int event = atomic_read(&iport->event);
1465 tmo = wait_event_timeout(ihost->eventq,
1466 event != atomic_read(&iport->event) ||
1467 !test_bit(IPORT_BCN_BLOCKED, &iport->flags),
1469 /* link down, stop polling */
1470 if (!test_bit(IPORT_BCN_BLOCKED, &iport->flags))
1473 dev_dbg(&ihost->pdev->dev,
1474 "%s: iport %p, iteration %d,"
1475 " phase %d: time_remaining %lu, bcns = %d\n",
1476 __func__, iport, iteration, phy_state,
1477 tmo, test_bit(IPORT_BCN_PENDING, &iport->flags));
1479 res = isci_smp_get_phy_attached_dev_type(ihost, dev, phy_num,
1480 &attached_device_type);
1481 tmo = deadline - jiffies;
1484 dev_warn(&ihost->pdev->dev,
1485 "%s: iteration %d, phase %d:"
1486 " SMP error=%d, time_remaining=%lu\n",
1487 __func__, iteration, phy_state, res, tmo);
1490 dev_dbg(&ihost->pdev->dev,
1491 "%s: iport %p, iteration %d,"
1492 " phase %d: time_remaining %lu, bcns = %d, "
1493 "attdevtype = %x\n",
1494 __func__, iport, iteration, phy_state,
1495 tmo, test_bit(IPORT_BCN_PENDING, &iport->flags),
1496 attached_device_type);
1498 switch (phy_state) {
1499 case SMP_PHYWAIT_PHYDOWN:
1500 /* Has the device gone away? */
1501 if (!attached_device_type)
1502 phy_state = SMP_PHYWAIT_PHYUP;
1506 case SMP_PHYWAIT_PHYUP:
1507 /* Has the device come back? */
1508 if (attached_device_type)
1509 phy_state = SMP_PHYWAIT_DONE;
1512 case SMP_PHYWAIT_DONE:
1517 dev_dbg(&ihost->pdev->dev, "%s: done\n", __func__);
1520 static int isci_reset_device(struct isci_host *ihost,
1521 struct isci_remote_device *idev, int hard_reset)
1523 struct sas_phy *phy = sas_find_local_phy(idev->domain_dev);
1524 struct isci_port *iport = idev->isci_port;
1525 enum sci_status status;
1526 unsigned long flags;
1529 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
1531 spin_lock_irqsave(&ihost->scic_lock, flags);
1532 status = scic_remote_device_reset(&idev->sci);
1533 if (status != SCI_SUCCESS) {
1534 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1536 dev_warn(&ihost->pdev->dev,
1537 "%s: scic_remote_device_reset(%p) returned %d!\n",
1538 __func__, idev, status);
1540 return TMF_RESP_FUNC_FAILED;
1542 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1544 /* Make sure all pending requests are able to be fully terminated. */
1545 isci_device_clear_reset_pending(ihost, idev);
1547 /* If this is a device on an expander, disable BCN processing. */
1548 if (!scsi_is_sas_phy_local(phy))
1549 set_bit(IPORT_BCN_BLOCKED, &iport->flags);
1551 rc = sas_phy_reset(phy, hard_reset);
1553 /* Terminate in-progress I/O now. */
1554 isci_remote_device_nuke_requests(ihost, idev);
1556 /* Since all pending TCs have been cleaned, resume the RNC. */
1557 spin_lock_irqsave(&ihost->scic_lock, flags);
1558 status = scic_remote_device_reset_complete(&idev->sci);
1559 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1561 /* If this is a device on an expander, bring the phy back up. */
1562 if (!scsi_is_sas_phy_local(phy)) {
1563 /* A phy reset will cause the device to go away then reappear.
1564 * Since libsas will take action on incoming BCNs (eg. remove
1565 * a device going through an SMP phy-control driven reset),
1566 * we need to wait until the phy comes back up before letting
1567 * discovery proceed in libsas.
1569 isci_wait_for_smp_phy_reset(idev, phy->number);
1571 spin_lock_irqsave(&ihost->scic_lock, flags);
1572 isci_port_bcn_enable(ihost, idev->isci_port);
1573 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1576 if (status != SCI_SUCCESS) {
1577 dev_warn(&ihost->pdev->dev,
1578 "%s: scic_remote_device_reset_complete(%p) "
1579 "returned %d!\n", __func__, idev, status);
1582 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
1587 int isci_task_I_T_nexus_reset(struct domain_device *dev)
1589 struct isci_host *ihost = dev_to_ihost(dev);
1590 struct isci_remote_device *idev;
1591 int ret, hard_reset = 1;
1592 unsigned long flags;
1594 spin_lock_irqsave(&ihost->scic_lock, flags);
1595 idev = isci_lookup_device(dev);
1596 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1598 if (!idev || !test_bit(IDEV_EH, &idev->flags)) {
1599 ret = TMF_RESP_FUNC_COMPLETE;
1603 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
1606 ret = isci_reset_device(ihost, idev, hard_reset);
1608 isci_put_device(idev);
1612 int isci_bus_reset_handler(struct scsi_cmnd *cmd)
1614 struct domain_device *dev = sdev_to_domain_dev(cmd->device);
1615 struct isci_host *ihost = dev_to_ihost(dev);
1616 struct isci_remote_device *idev;
1617 int ret, hard_reset = 1;
1618 unsigned long flags;
1620 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
1623 spin_lock_irqsave(&ihost->scic_lock, flags);
1624 idev = isci_lookup_device(dev);
1625 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1628 ret = TMF_RESP_FUNC_COMPLETE;
1632 ret = isci_reset_device(ihost, idev, hard_reset);
1634 isci_put_device(idev);