/**
* isci_task_execute_task() - This function is one of the SAS Domain Template
* functions. This function is called by libsas to send a task down to
* hardware.
* @task: This parameter specifies the SAS task to send.
* @num: This parameter specifies the number of tasks to queue.
* @gfp_flags: This parameter specifies the context of this call.
*
* status, zero indicates success.
*/
int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
{
struct isci_host *ihost = dev_to_ihost(task->dev);
struct isci_remote_device *idev;
unsigned long flags;
bool io_ready;
u16 tag;
dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
for_each_sas_task(num, task) {
enum sci_status status = SCI_FAILURE;
spin_lock_irqsave(&ihost->scic_lock, flags);
idev = isci_lookup_device(task->dev);
io_ready = isci_device_io_ready(idev, task);
tag = isci_alloc_tag(ihost);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
dev_dbg(&ihost->pdev->dev,
"task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
task, num, task->dev, idev, idev ? idev->flags : 0,
task->uldd_task);
if (!idev) {
isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
} else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
/* Indicate QUEUE_FULL so that the scsi midlayer
* retries.
*/
isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
} else {
/* There is a device and it's ready for I/O. */
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
/* The I/O was aborted. */
spin_unlock_irqrestore(&task->task_state_lock,
flags);
isci_task_refuse(ihost, task,
SAS_TASK_UNDELIVERED,
SAM_STAT_TASK_ABORTED);
} else {
task->task_state_flags |= SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* build and send the request. */
status = isci_request_execute(ihost, idev, task, tag);
if (status != SCI_SUCCESS) {
spin_lock_irqsave(&task->task_state_lock, flags);
/* Did not really start this command. */
task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
if (test_bit(IDEV_GONE, &idev->flags)) {
/* Indicate that the device
* is gone.
*/
isci_task_refuse(ihost, task,
SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
} else {
/* Indicate QUEUE_FULL so that
* the scsi midlayer retries.
* If the request failed for
* remote device reasons, it
* gets returned as
* SAS_TASK_UNDELIVERED next
* time through.
*/
isci_task_refuse(ihost, task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
}
}
}
}
if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
spin_lock_irqsave(&ihost->scic_lock, flags);
/* command never hit the device, so just free
* the tci and skip the sequence increment
*/
isci_tci_free(ihost, ISCI_TAG_TCI(tag));
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
isci_put_device(idev);
}
return 0;
}
int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
{
struct isci_host *ihost = dev_to_ihost(task->dev);
struct isci_remote_device *idev;
unsigned long flags;
bool io_ready;
u16 tag;
dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
for_each_sas_task(num, task) {
enum sci_status status = SCI_FAILURE;
spin_lock_irqsave(&ihost->scic_lock, flags);
idev = isci_lookup_device(task->dev);
io_ready = isci_device_io_ready(idev, task);
tag = isci_alloc_tag(ihost);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
dev_dbg(&ihost->pdev->dev,
"task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
task, num, task->dev, idev, idev ? idev->flags : 0,
task->uldd_task);
if (!idev) {
isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
} else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
} else {
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
spin_unlock_irqrestore(&task->task_state_lock,
flags);
isci_task_refuse(ihost, task,
SAS_TASK_UNDELIVERED,
SAM_STAT_TASK_ABORTED);
} else {
task->task_state_flags |= SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
status = isci_request_execute(ihost, idev, task, tag);
if (status != SCI_SUCCESS) {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
if (test_bit(IDEV_GONE, &idev->flags)) {
isci_task_refuse(ihost, task,
SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
} else {
isci_task_refuse(ihost, task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
}
}
}
}
if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
spin_lock_irqsave(&ihost->scic_lock, flags);
isci_tci_free(ihost, ISCI_TAG_TCI(tag));
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
isci_put_device(idev);
}
return 0;
}