scsi: smartpqi: Add additional logging for LUN resets

LUN resets can take longer to complete. Adding in more driver logging helps
show where the driver is in the reset process.

Add a timeout in pqi_device_wait_for_pending_io() to cap how long the
driver will wait for outstanding commands.

Link: https://lore.kernel.org/r/161549385119.25025.10366493975709358647.stgit@brunhildaReviewed-by: Mahesh Rajashekhara <mahesh.rajashekhara@microchip.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -84,7 +84,7 @@ static void pqi_ofa_setup_host_buffer(struct pqi_ctrl_info *ctrl_info);
 static void pqi_ofa_free_host_buffer(struct pqi_ctrl_info *ctrl_info);
 static int pqi_ofa_host_memory_update(struct pqi_ctrl_info *ctrl_info);
 static int pqi_device_wait_for_pending_io(struct pqi_ctrl_info *ctrl_info,
-	struct pqi_scsi_dev *device, unsigned long timeout_secs);
+	struct pqi_scsi_dev *device, unsigned long timeout_msecs);
 
 /* for flags argument to pqi_submit_raid_request_synchronous() */
 #define PQI_SYNC_FLAGS_INTERRUPTABLE	0x1
@@ -335,11 +335,34 @@ static void pqi_wait_if_ctrl_blocked(struct pqi_ctrl_info *ctrl_info)
 	atomic_dec(&ctrl_info->num_blocked_threads);
 }
 
+#define PQI_QUIESCE_WARNING_TIMEOUT_SECS		10
+
 static inline void pqi_ctrl_wait_until_quiesced(struct pqi_ctrl_info *ctrl_info)
 {
+	unsigned long start_jiffies;
+	unsigned long warning_timeout;
+	bool displayed_warning;
+
+	displayed_warning = false;
+	start_jiffies = jiffies;
+	warning_timeout = (PQI_QUIESCE_WARNING_TIMEOUT_SECS * PQI_HZ) + start_jiffies;
+
 	while (atomic_read(&ctrl_info->num_busy_threads) >
-		atomic_read(&ctrl_info->num_blocked_threads))
+		atomic_read(&ctrl_info->num_blocked_threads)) {
+		if (time_after(jiffies, warning_timeout)) {
+			dev_warn(&ctrl_info->pci_dev->dev,
+				"waiting %u seconds for driver activity to quiesce\n",
+				jiffies_to_msecs(jiffies - start_jiffies) / 1000);
+			displayed_warning = true;
+			warning_timeout = (PQI_QUIESCE_WARNING_TIMEOUT_SECS * PQI_HZ) + jiffies;
+		}
 		usleep_range(1000, 2000);
+	}
+
+	if (displayed_warning)
+		dev_warn(&ctrl_info->pci_dev->dev,
+			"driver activity quiesced after waiting for %u seconds\n",
+			jiffies_to_msecs(jiffies - start_jiffies) / 1000);
 }
 
 static inline bool pqi_device_offline(struct pqi_scsi_dev *device)
@@ -1669,7 +1692,7 @@ static int pqi_add_device(struct pqi_ctrl_info *ctrl_info,
 	return rc;
 }
 
-#define PQI_PENDING_IO_TIMEOUT_SECS	20
+#define PQI_REMOVE_DEVICE_PENDING_IO_TIMEOUT_MSECS	(20 * 1000)
 
 static inline void pqi_remove_device(struct pqi_ctrl_info *ctrl_info, struct pqi_scsi_dev *device)
 {
@@ -1677,7 +1700,8 @@ static inline void pqi_remove_device(struct pqi_ctrl_info *ctrl_info, struct pqi
 
 	pqi_device_remove_start(device);
 
-	rc = pqi_device_wait_for_pending_io(ctrl_info, device, PQI_PENDING_IO_TIMEOUT_SECS);
+	rc = pqi_device_wait_for_pending_io(ctrl_info, device,
+		PQI_REMOVE_DEVICE_PENDING_IO_TIMEOUT_MSECS);
 	if (rc)
 		dev_err(&ctrl_info->pci_dev->dev,
 			"scsi %d:%d:%d:%d removing device with %d outstanding command(s)\n",
@@ -3086,7 +3110,7 @@ static void pqi_process_io_error(unsigned int iu_type,
 	}
 }
 
-static int pqi_interpret_task_management_response(
+static int pqi_interpret_task_management_response(struct pqi_ctrl_info *ctrl_info,
 	struct pqi_task_management_response *response)
 {
 	int rc;
@@ -3104,6 +3128,10 @@ static int pqi_interpret_task_management_response(
 		break;
 	}
 
+	if (rc)
+		dev_err(&ctrl_info->pci_dev->dev,
+			"Task Management Function error: %d (response code: %u)\n", rc, response->response_code);
+
 	return rc;
 }
 
@@ -3172,9 +3200,8 @@ static int pqi_process_io_intr(struct pqi_ctrl_info *ctrl_info, struct pqi_queue
 				&((struct pqi_vendor_general_response *)response)->status);
 			break;
 		case PQI_RESPONSE_IU_TASK_MANAGEMENT:
-			io_request->status =
-				pqi_interpret_task_management_response(
-					(void *)response);
+			io_request->status = pqi_interpret_task_management_response(ctrl_info,
+				(void *)response);
 			break;
 		case PQI_RESPONSE_IU_AIO_PATH_DISABLED:
 			pqi_aio_path_disabled(io_request);
@@ -5836,24 +5863,37 @@ static void pqi_fail_io_queued_for_device(struct pqi_ctrl_info *ctrl_info,
 	}
 }
 
+#define PQI_PENDING_IO_WARNING_TIMEOUT_SECS	10
+
 static int pqi_device_wait_for_pending_io(struct pqi_ctrl_info *ctrl_info,
-	struct pqi_scsi_dev *device, unsigned long timeout_secs)
+	struct pqi_scsi_dev *device, unsigned long timeout_msecs)
 {
-	unsigned long timeout;
+	int cmds_outstanding;
+	unsigned long start_jiffies;
+	unsigned long warning_timeout;
+	unsigned long msecs_waiting;
 
+	start_jiffies = jiffies;
+	warning_timeout = (PQI_PENDING_IO_WARNING_TIMEOUT_SECS * PQI_HZ) + start_jiffies;
 
-	timeout = (timeout_secs * PQI_HZ) + jiffies;
-
-	while (atomic_read(&device->scsi_cmds_outstanding)) {
+	while ((cmds_outstanding = atomic_read(&device->scsi_cmds_outstanding)) > 0) {
 		pqi_check_ctrl_health(ctrl_info);
 		if (pqi_ctrl_offline(ctrl_info))
 			return -ENXIO;
-		if (timeout_secs != NO_TIMEOUT) {
-			if (time_after(jiffies, timeout)) {
-				dev_err(&ctrl_info->pci_dev->dev,
-					"timed out waiting for pending I/O\n");
-				return -ETIMEDOUT;
-			}
+		msecs_waiting = jiffies_to_msecs(jiffies - start_jiffies);
+		if (msecs_waiting > timeout_msecs) {
+			dev_err(&ctrl_info->pci_dev->dev,
+				"scsi %d:%d:%d:%d: timed out after %lu seconds waiting for %d outstanding command(s)\n",
+				ctrl_info->scsi_host->host_no, device->bus, device->target,
+				device->lun, msecs_waiting / 1000, cmds_outstanding);
+			return -ETIMEDOUT;
+		}
+		if (time_after(jiffies, warning_timeout)) {
+			dev_warn(&ctrl_info->pci_dev->dev,
+				"scsi %d:%d:%d:%d: waiting %lu seconds for %d outstanding command(s)\n",
+				ctrl_info->scsi_host->host_no, device->bus, device->target,
+				device->lun, msecs_waiting / 1000, cmds_outstanding);
+			warning_timeout = (PQI_PENDING_IO_WARNING_TIMEOUT_SECS * PQI_HZ) + jiffies;
 		}
 		usleep_range(1000, 2000);
 	}
@@ -5869,13 +5909,15 @@ static void pqi_lun_reset_complete(struct pqi_io_request *io_request,
 	complete(waiting);
 }
 
-#define PQI_LUN_RESET_TIMEOUT_SECS		30
 #define PQI_LUN_RESET_POLL_COMPLETION_SECS	10
 
 static int pqi_wait_for_lun_reset_completion(struct pqi_ctrl_info *ctrl_info,
 	struct pqi_scsi_dev *device, struct completion *wait)
 {
 	int rc;
+	unsigned int wait_secs;
+
+	wait_secs = 0;
 
 	while (1) {
 		if (wait_for_completion_io_timeout(wait,
@@ -5889,13 +5931,21 @@ static int pqi_wait_for_lun_reset_completion(struct pqi_ctrl_info *ctrl_info,
 			rc = -ENXIO;
 			break;
 		}
+
+		wait_secs += PQI_LUN_RESET_POLL_COMPLETION_SECS;
+
+		dev_warn(&ctrl_info->pci_dev->dev,
+			"scsi %d:%d:%d:%d: waiting %u seconds for LUN reset to complete\n",
+			ctrl_info->scsi_host->host_no, device->bus, device->target, device->lun,
+			wait_secs);
 	}
 
 	return rc;
 }
 
-static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info,
-	struct pqi_scsi_dev *device)
+#define PQI_LUN_RESET_FIRMWARE_TIMEOUT_SECS	30
+
+static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info, struct pqi_scsi_dev *device)
 {
 	int rc;
 	struct pqi_io_request *io_request;
@@ -5917,8 +5967,7 @@ static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info,
 		sizeof(request->lun_number));
 	request->task_management_function = SOP_TASK_MANAGEMENT_LUN_RESET;
 	if (ctrl_info->tmf_iu_timeout_supported)
-		put_unaligned_le16(PQI_LUN_RESET_TIMEOUT_SECS,
-					&request->timeout);
+		put_unaligned_le16(PQI_LUN_RESET_FIRMWARE_TIMEOUT_SECS, &request->timeout);
 
 	pqi_start_io(ctrl_info, &ctrl_info->queue_groups[PQI_DEFAULT_QUEUE_GROUP], RAID_PATH,
 		io_request);
@@ -5932,29 +5981,33 @@ static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info,
 	return rc;
 }
 
-#define PQI_LUN_RESET_RETRIES			3
-#define PQI_LUN_RESET_RETRY_INTERVAL_MSECS	10000
-#define PQI_LUN_RESET_PENDING_IO_TIMEOUT_SECS	120
+#define PQI_LUN_RESET_RETRIES				3
+#define PQI_LUN_RESET_RETRY_INTERVAL_MSECS		(10 * 1000)
+#define PQI_LUN_RESET_PENDING_IO_TIMEOUT_MSECS		(10 * 60 * 1000)
+#define PQI_LUN_RESET_FAILED_PENDING_IO_TIMEOUT_MSECS	(2 * 60 * 1000)
 
-static int pqi_lun_reset_with_retries(struct pqi_ctrl_info *ctrl_info,
-	struct pqi_scsi_dev *device)
+static int pqi_lun_reset_with_retries(struct pqi_ctrl_info *ctrl_info, struct pqi_scsi_dev *device)
 {
-	int rc;
+	int reset_rc;
+	int wait_rc;
 	unsigned int retries;
-	unsigned long timeout_secs;
+	unsigned long timeout_msecs;
 
 	for (retries = 0;;) {
-		rc = pqi_lun_reset(ctrl_info, device);
-		if (rc == 0 || ++retries > PQI_LUN_RESET_RETRIES)
+		reset_rc = pqi_lun_reset(ctrl_info, device);
+		if (reset_rc == 0 || ++retries > PQI_LUN_RESET_RETRIES)
 			break;
 		msleep(PQI_LUN_RESET_RETRY_INTERVAL_MSECS);
 	}
 
-	timeout_secs = rc ? PQI_LUN_RESET_PENDING_IO_TIMEOUT_SECS : NO_TIMEOUT;
+	timeout_msecs = reset_rc ? PQI_LUN_RESET_FAILED_PENDING_IO_TIMEOUT_MSECS :
+		PQI_LUN_RESET_PENDING_IO_TIMEOUT_MSECS;
 
-	rc |= pqi_device_wait_for_pending_io(ctrl_info, device, timeout_secs);
+	wait_rc = pqi_device_wait_for_pending_io(ctrl_info, device, timeout_msecs);
+	if (wait_rc && reset_rc == 0)
+		reset_rc = wait_rc;
 
-	return rc == 0 ? SUCCESS : FAILED;
+	return reset_rc == 0 ? SUCCESS : FAILED;
 }
 
 static int pqi_device_reset(struct pqi_ctrl_info *ctrl_info,