[isci-rnc PATCH v1 15/37] isci: Distinguish between remote device suspension cases

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From: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>

For NCQ error conditions among others, there is no need to enable
the link layer hang detect timer.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
 drivers/scsi/isci/remote_device.c       |   27 +++++++++++----------------
 drivers/scsi/isci/remote_node_context.c |   19 +++++++++++++------
 drivers/scsi/isci/remote_node_context.h |    5 +++--
 drivers/scsi/isci/request.c             |    2 +-
 4 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index b14eff3..cc8ab69 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -72,10 +72,11 @@ const char *dev_state_name(enum sci_remote_device_states state)
 }
 #undef C
 
-static enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev)
+static enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev,
+						 enum sci_remote_node_suspension_reasons reason)
 {
 	return sci_remote_node_context_suspend(&idev->rnc,
-					       SCI_SOFTWARE_SUSPENSION,
+					       reason,
 					       SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT,
 					       NULL, NULL);
 }
@@ -199,7 +200,7 @@ static void isci_remote_device_not_ready(struct isci_host *ihost,
 		set_bit(IDEV_IO_NCQERROR, &idev->flags);
 
 		/* Suspend the remote device so the I/O can be terminated. */
-		sci_remote_device_suspend(idev);
+		sci_remote_device_suspend(idev, SCI_SW_SUSPEND_NORMAL);
 
 		/* Kill all outstanding requests for the device. */
 		sci_remote_device_terminate_requests(idev);
@@ -268,7 +269,8 @@ enum sci_status sci_remote_device_stop(struct isci_remote_device *idev,
 							 rnc_destruct_done,
 							 idev);
 		else {
-			sci_remote_device_suspend(idev);
+			sci_remote_device_suspend(
+				idev, SCI_SW_SUSPEND_LINKHANG_DETECT);
 			sci_remote_device_terminate_requests(idev);
 		}
 		return SCI_SUCCESS;
@@ -473,11 +475,7 @@ enum sci_status sci_remote_device_event_handler(struct isci_remote_device *idev,
 			status = SCI_SUCCESS;
 
 			/* Suspend the associated RNC */
-			sci_remote_node_context_suspend(
-				&idev->rnc,
-				SCI_SOFTWARE_SUSPENSION,
-				SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT,
-				NULL, NULL);
+			sci_remote_device_suspend(idev, SCI_SW_SUSPEND_NORMAL);
 
 			dev_dbg(scirdev_to_dev(idev),
 				"%s: device: %p event code: %x: %s\n",
@@ -789,9 +787,8 @@ enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
 		 * the correct action when the remote node context is suspended
 		 * and later resumed.
 		 */
-		sci_remote_node_context_suspend(
-			&idev->rnc, SCI_SOFTWARE_SUSPENSION,
-			SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT, NULL, NULL);
+		sci_remote_device_suspend(idev,
+					  SCI_SW_SUSPEND_LINKHANG_DETECT);
 
 		status = sci_remote_node_context_start_task(&idev->rnc, ireq,
 				sci_remote_device_continue_request, idev);
@@ -986,9 +983,7 @@ static void sci_remote_device_resetting_state_enter(struct sci_base_state_machin
 	dev_dbg(&ihost->pdev->dev,
 		"%s: isci_device = %p\n", __func__, idev);
 
-	sci_remote_node_context_suspend(
-		&idev->rnc, SCI_SOFTWARE_SUSPENSION,
-		SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT, NULL, NULL);
+	sci_remote_device_suspend(idev, SCI_SW_SUSPEND_LINKHANG_DETECT);
 }
 
 static void sci_remote_device_resetting_state_exit(struct sci_base_state_machine *sm)
@@ -1486,7 +1481,7 @@ enum sci_status isci_remote_device_suspend_terminate(
 
 	/* Put the device into suspension. */
 	spin_lock_irqsave(&ihost->scic_lock, flags);
-	sci_remote_device_suspend(idev);
+	sci_remote_device_suspend(idev, SCI_SW_SUSPEND_LINKHANG_DETECT);
 	spin_unlock_irqrestore(&ihost->scic_lock, flags);
 
 	/* Terminate and wait for the completions. */
diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index adbb4b8..85bf5ec 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -52,7 +52,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-
+#include <scsi/sas_ata.h>
 #include "host.h"
 #include "isci.h"
 #include "remote_device.h"
@@ -315,7 +315,7 @@ static void sci_remote_node_context_ready_state_enter(struct sci_base_state_mach
 	if ((dest_select == RNC_DEST_SUSPENDED) ||
 	    (dest_select == RNC_DEST_SUSPENDED_RESUME)) {
 		sci_remote_node_context_suspend(
-			rnc, SCI_SOFTWARE_SUSPENSION,
+			rnc, SCI_SW_SUSPEND_NORMAL,
 			SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT, NULL, NULL);
 
 		if (dest_select == RNC_DEST_SUSPENDED_RESUME) {
@@ -352,8 +352,10 @@ static void sci_remote_node_context_await_suspend_state_exit(
 {
 	struct sci_remote_node_context *rnc
 		= container_of(sm, typeof(*rnc), sm);
+	struct isci_remote_device *idev = rnc_to_dev(rnc);
 
-	isci_dev_set_hang_detection_timeout(rnc_to_dev(rnc), 0);
+	if (dev_is_sata(idev->domain_dev))
+		isci_dev_set_hang_detection_timeout(idev, 0);
 }
 
 static const struct sci_base_state sci_remote_node_context_state_table[] = {
@@ -556,7 +558,7 @@ enum sci_status sci_remote_node_context_suspend(
 		suspend_type);
 
 	/* Disable automatic state continuations if explicitly suspending. */
-	if ((suspend_reason != SCI_SOFTWARE_SUSPENSION) ||
+	if ((suspend_reason == SCI_HW_SUSPEND) ||
 	    (sci_rnc->destination_state == RNC_DEST_FINAL))
 		dest_param = sci_rnc->destination_state;
 
@@ -612,8 +614,13 @@ enum sci_status sci_remote_node_context_suspend(
 		wake_up_all(&ihost->eventq); /* Let observers look. */
 		return SCI_SUCCESS;
 	}
-	if (suspend_reason == SCI_SOFTWARE_SUSPENSION) {
-		isci_dev_set_hang_detection_timeout(idev, 0x00000001);
+	if ((suspend_reason == SCI_SW_SUSPEND_NORMAL) ||
+	    (suspend_reason == SCI_SW_SUSPEND_LINKHANG_DETECT)) {
+
+		if ((suspend_reason == SCI_SW_SUSPEND_LINKHANG_DETECT)
+		 && dev_is_sata(idev->domain_dev))
+			isci_dev_set_hang_detection_timeout(idev, 0x00000001);
+
 		sci_remote_device_post_request(
 			idev, SCI_SOFTWARE_SUSPEND_CMD);
 	}
diff --git a/drivers/scsi/isci/remote_node_context.h b/drivers/scsi/isci/remote_node_context.h
index 4831906..364da37 100644
--- a/drivers/scsi/isci/remote_node_context.h
+++ b/drivers/scsi/isci/remote_node_context.h
@@ -76,8 +76,9 @@
 #define SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX    0x0FFF
 
 enum sci_remote_node_suspension_reasons {
-	SCU_HARDWARE_SUSPENSION,
-	SCI_SOFTWARE_SUSPENSION
+	SCI_HW_SUSPEND,
+	SCI_SW_SUSPEND_NORMAL,
+	SCI_SW_SUSPEND_LINKHANG_DETECT
 };
 #define SCI_SOFTWARE_SUSPEND_CMD SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX
 #define SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT SCU_EVENT_TL_RNC_SUSPEND_TX_RX
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index c6a522c..d240f6d 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -2380,7 +2380,7 @@ static void sci_request_handle_suspending_completions(
 
 		sci_remote_node_context_suspend(
 			&ireq->target_device->rnc,
-			SCU_HARDWARE_SUSPENSION,
+			SCI_HW_SUSPEND,
 			(is_tx_rx) ? SCU_EVENT_TL_RNC_SUSPEND_TX_RX
 				   : SCU_EVENT_TL_RNC_SUSPEND_TX,
 			NULL, NULL);

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