예제 #1
0
/**
 * 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;
}
예제 #2
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;
}