void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev)
{
struct completion request_completion;
enum isci_request_status old_state;
unsigned long flags;
LIST_HEAD(list);
spin_lock_irqsave(&ihost->scic_lock, flags);
list_splice_init(&idev->reqs_in_process, &list);
while (!list_empty(&list)) {
struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
old_state = isci_request_change_started_to_newstate(ireq,
&request_completion,
terminating);
switch (old_state) {
case started:
case completed:
case aborting:
break;
default:
list_move(&ireq->dev_node, &idev->reqs_in_process);
ireq = NULL;
break;
}
if (!ireq)
continue;
spin_unlock_irqrestore(&ihost->scic_lock, flags);
init_completion(&request_completion);
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p request=%p; task=%p old_state=%d\n",
__func__, idev, ireq,
(!test_bit(IREQ_TMF, &ireq->flags)
? isci_request_access_task(ireq)
: NULL),
old_state);
isci_terminate_request_core(ihost, idev, ireq);
spin_lock_irqsave(&ihost->scic_lock, flags);
}
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
/**
* isci_task_abort_task() - This function is one of the SAS Domain Template
* functions. This function is called by libsas to abort a specified task.
* @task: This parameter specifies the SAS task to abort.
*
* status, zero indicates success.
*/
int isci_task_abort_task(struct sas_task *task)
{
struct isci_host *isci_host = dev_to_ihost(task->dev);
DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
struct isci_request *old_request = NULL;
enum isci_request_status old_state;
struct isci_remote_device *isci_device = NULL;
struct isci_tmf tmf;
int ret = TMF_RESP_FUNC_FAILED;
unsigned long flags;
int perform_termination = 0;
/* Get the isci_request reference from the task. Note that
* this check does not depend on the pending request list
* in the device, because tasks driving resets may land here
* after completion in the core.
*/
spin_lock_irqsave(&isci_host->scic_lock, flags);
spin_lock(&task->task_state_lock);
old_request = task->lldd_task;
/* If task is already done, the request isn't valid */
if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
old_request)
isci_device = isci_lookup_device(task->dev);
spin_unlock(&task->task_state_lock);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: dev = %p, task = %p, old_request == %p\n",
__func__, isci_device, task, old_request);
/* Device reset conditions signalled in task_state_flags are the
* responsbility of libsas to observe at the start of the error
* handler thread.
*/
if (!isci_device || !old_request) {
/* The request has already completed and there
* is nothing to do here other than to set the task
* done bit, and indicate that the task abort function
* was successful.
*/
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
dev_dbg(&isci_host->pdev->dev,
"%s: abort task not needed for %p\n",
__func__, task);
goto out;
}
spin_lock_irqsave(&isci_host->scic_lock, flags);
/* Check the request status and change to "aborted" if currently
* "starting"; if true then set the I/O kernel completion
* struct that will be triggered when the request completes.
*/
old_state = isci_task_validate_request_to_abort(
old_request, isci_host, isci_device,
&aborted_io_completion);
if ((old_state != started) &&
(old_state != completed) &&
(old_state != aborting)) {
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* The request was already being handled by someone else (because
* they got to set the state away from started).
*/
dev_dbg(&isci_host->pdev->dev,
"%s: device = %p; old_request %p already being aborted\n",
__func__,
isci_device, old_request);
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
if (task->task_proto == SAS_PROTOCOL_SMP ||
sas_protocol_ata(task->task_proto) ||
test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: %s request"
" or complete_in_target (%d), thus no TMF\n",
__func__,
((task->task_proto == SAS_PROTOCOL_SMP)
? "SMP"
: (sas_protocol_ata(task->task_proto)
? "SATA/STP"
: "<other>")
),
test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
} else {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
}
/* STP and SMP devices are not sent a TMF, but the
* outstanding I/O request is terminated below. This is
* because SATA/STP and SMP discovery path timeouts directly
* call the abort task interface for cleanup.
*/
perform_termination = 1;
} else {
/* Fill in the tmf stucture */
isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
isci_abort_task_process_cb,
old_request);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
#define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
ISCI_ABORT_TASK_TIMEOUT_MS);
if (ret == TMF_RESP_FUNC_COMPLETE)
perform_termination = 1;
else
dev_dbg(&isci_host->pdev->dev,
"%s: isci_task_send_tmf failed\n", __func__);
}
if (perform_termination) {
set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
/* Clean up the request on our side, and wait for the aborted
* I/O to complete.
*/
isci_terminate_request_core(isci_host, isci_device,
old_request);
}
/* Make sure we do not leave a reference to aborted_io_completion */
old_request->io_request_completion = NULL;
out:
isci_put_device(isci_device);
return ret;
}
/**
* isci_terminate_pending_requests() - This function will change the all of the
* requests on the given device's state to "aborting", will terminate the
* requests, and wait for them to complete. This function must only be
* called from a thread that can wait. Note that the requests are all
* terminated and completed (back to the host, if started there).
* @isci_host: This parameter specifies SCU.
* @idev: This parameter specifies the target.
*
*/
void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev)
{
struct completion request_completion;
enum isci_request_status old_state;
unsigned long flags;
LIST_HEAD(list);
spin_lock_irqsave(&ihost->scic_lock, flags);
list_splice_init(&idev->reqs_in_process, &list);
/* assumes that isci_terminate_request_core deletes from the list */
while (!list_empty(&list)) {
struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
/* Change state to "terminating" if it is currently
* "started".
*/
old_state = isci_request_change_started_to_newstate(ireq,
&request_completion,
terminating);
switch (old_state) {
case started:
case completed:
case aborting:
break;
default:
/* termination in progress, or otherwise dispositioned.
* We know the request was on 'list' so should be safe
* to move it back to reqs_in_process
*/
list_move(&ireq->dev_node, &idev->reqs_in_process);
ireq = NULL;
break;
}
if (!ireq)
continue;
spin_unlock_irqrestore(&ihost->scic_lock, flags);
init_completion(&request_completion);
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p request=%p; task=%p old_state=%d\n",
__func__, idev, ireq,
(!test_bit(IREQ_TMF, &ireq->flags)
? isci_request_access_task(ireq)
: NULL),
old_state);
/* If the old_state is started:
* This request was not already being aborted. If it had been,
* then the aborting I/O (ie. the TMF request) would not be in
* the aborting state, and thus would be terminated here. Note
* that since the TMF completion's call to the kernel function
* "complete()" does not happen until the pending I/O request
* terminate fully completes, we do not have to implement a
* special wait here for already aborting requests - the
* termination of the TMF request will force the request
* to finish it's already started terminate.
*
* If old_state == completed:
* This request completed from the SCU hardware perspective
* and now just needs cleaning up in terms of freeing the
* request and potentially calling up to libsas.
*
* If old_state == aborting:
* This request has already gone through a TMF timeout, but may
* not have been terminated; needs cleaning up at least.
*/
isci_terminate_request_core(ihost, idev, ireq);
spin_lock_irqsave(&ihost->scic_lock, flags);
}
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
int isci_task_abort_task(struct sas_task *task)
{
struct isci_host *isci_host = dev_to_ihost(task->dev);
DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
struct isci_request *old_request = NULL;
enum isci_request_status old_state;
struct isci_remote_device *isci_device = NULL;
struct isci_tmf tmf;
int ret = TMF_RESP_FUNC_FAILED;
unsigned long flags;
int perform_termination = 0;
spin_lock_irqsave(&isci_host->scic_lock, flags);
spin_lock(&task->task_state_lock);
old_request = task->lldd_task;
if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
old_request)
isci_device = isci_lookup_device(task->dev);
spin_unlock(&task->task_state_lock);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: dev = %p, task = %p, old_request == %p\n",
__func__, isci_device, task, old_request);
if (!isci_device || !old_request) {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
dev_dbg(&isci_host->pdev->dev,
"%s: abort task not needed for %p\n",
__func__, task);
goto out;
}
spin_lock_irqsave(&isci_host->scic_lock, flags);
old_state = isci_task_validate_request_to_abort(
old_request, isci_host, isci_device,
&aborted_io_completion);
if ((old_state != started) &&
(old_state != completed) &&
(old_state != aborting)) {
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: device = %p; old_request %p already being aborted\n",
__func__,
isci_device, old_request);
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
if (task->task_proto == SAS_PROTOCOL_SMP ||
sas_protocol_ata(task->task_proto) ||
test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: %s request"
" or complete_in_target (%d), thus no TMF\n",
__func__,
((task->task_proto == SAS_PROTOCOL_SMP)
? "SMP"
: (sas_protocol_ata(task->task_proto)
? "SATA/STP"
: "<other>")
),
test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
} else {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
}
perform_termination = 1;
} else {
isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
isci_abort_task_process_cb,
old_request);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
#define ISCI_ABORT_TASK_TIMEOUT_MS 500
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
ISCI_ABORT_TASK_TIMEOUT_MS);
if (ret == TMF_RESP_FUNC_COMPLETE)
perform_termination = 1;
else
dev_dbg(&isci_host->pdev->dev,
"%s: isci_task_send_tmf failed\n", __func__);
}
if (perform_termination) {
set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
isci_terminate_request_core(isci_host, isci_device,
old_request);
}
old_request->io_request_completion = NULL;
out:
isci_put_device(isci_device);
return ret;
}
