scsi: mpi3mr: Add support for timestamp sync with firmware

This operation requests that the IOC update the TimeStamp.

When the I/O Unit is powered on it sets the TimeStamp field value to
0x0000_0000_0000_0000 and increments the current value every millisecond.
A host driver sets the TimeStamp field to the current time by using an
IOCInit request. The TimeStamp field is periodically updated by the host
driver.

Link: https://lore.kernel.org/r/20210520152545.2710479-11-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mpi3mr/mpi3mr.h

@@ -104,6 +104,7 @@ extern struct list_head mrioc_list;
 #define MPI3MR_PORTENABLE_TIMEOUT		300
 #define MPI3MR_RESETTM_TIMEOUT			30
 #define MPI3MR_RESET_HOST_IOWAIT_TIMEOUT	5
+#define MPI3MR_TSUPDATE_INTERVAL		900
 #define MPI3MR_DEFAULT_SHUTDOWN_TIME		120
 
 #define MPI3MR_WATCHDOG_INTERVAL		1000 /* in milli seconds */
@@ -636,6 +637,7 @@ struct scmd_priv {
  * @dev_handle_bitmap_sz: Device handle bitmap size
  * @removepend_bitmap: Remove pending bitmap
  * @delayed_rmhs_list: Delayed device removal list
+ * @ts_update_counter: Timestamp update counter
  * @fault_dbg: Fault debug flag
  * @reset_in_progress: Reset in progress flag
  * @unrecoverable: Controller unrecoverable flag
@@ -758,6 +760,7 @@ struct mpi3mr_ioc {
 	void *removepend_bitmap;
 	struct list_head delayed_rmhs_list;
 
+	u32 ts_update_counter;
 	u8 fault_dbg;
 	u8 reset_in_progress;
 	u8 unrecoverable;

drivers/scsi/mpi3mr/mpi3mr_fw.c

@@ -1471,6 +1471,74 @@ int mpi3mr_op_request_post(struct mpi3mr_ioc *mrioc,
 	return retval;
 }
 
+/**
+ * mpi3mr_sync_timestamp - Issue time stamp sync request
+ * @mrioc: Adapter reference
+ *
+ * Issue IO unit control MPI request to synchornize firmware
+ * timestamp with host time.
+ *
+ * Return: 0 on success, non-zero on failure.
+ */
+static int mpi3mr_sync_timestamp(struct mpi3mr_ioc *mrioc)
+{
+	ktime_t current_time;
+	struct mpi3_iounit_control_request iou_ctrl;
+	int retval = 0;
+
+	memset(&iou_ctrl, 0, sizeof(iou_ctrl));
+	mutex_lock(&mrioc->init_cmds.mutex);
+	if (mrioc->init_cmds.state & MPI3MR_CMD_PENDING) {
+		retval = -1;
+		ioc_err(mrioc, "Issue IOUCTL time_stamp: command is in use\n");
+		mutex_unlock(&mrioc->init_cmds.mutex);
+		goto out;
+	}
+	mrioc->init_cmds.state = MPI3MR_CMD_PENDING;
+	mrioc->init_cmds.is_waiting = 1;
+	mrioc->init_cmds.callback = NULL;
+	iou_ctrl.host_tag = cpu_to_le16(MPI3MR_HOSTTAG_INITCMDS);
+	iou_ctrl.function = MPI3_FUNCTION_IO_UNIT_CONTROL;
+	iou_ctrl.operation = MPI3_CTRL_OP_UPDATE_TIMESTAMP;
+	current_time = ktime_get_real();
+	iou_ctrl.param64[0] = cpu_to_le64(ktime_to_ms(current_time));
+
+	init_completion(&mrioc->init_cmds.done);
+	retval = mpi3mr_admin_request_post(mrioc, &iou_ctrl,
+	    sizeof(iou_ctrl), 0);
+	if (retval) {
+		ioc_err(mrioc, "Issue IOUCTL time_stamp: Admin Post failed\n");
+		goto out_unlock;
+	}
+
+	wait_for_completion_timeout(&mrioc->init_cmds.done,
+	    (MPI3MR_INTADMCMD_TIMEOUT * HZ));
+	if (!(mrioc->init_cmds.state & MPI3MR_CMD_COMPLETE)) {
+		ioc_err(mrioc, "Issue IOUCTL time_stamp: command timed out\n");
+		mrioc->init_cmds.is_waiting = 0;
+		mpi3mr_soft_reset_handler(mrioc,
+		    MPI3MR_RESET_FROM_TSU_TIMEOUT, 1);
+		retval = -1;
+		goto out_unlock;
+	}
+	if ((mrioc->init_cmds.ioc_status & MPI3_IOCSTATUS_STATUS_MASK)
+	    != MPI3_IOCSTATUS_SUCCESS) {
+		ioc_err(mrioc,
+		    "Issue IOUCTL time_stamp: Failed ioc_status(0x%04x) Loginfo(0x%08x)\n",
+		    (mrioc->init_cmds.ioc_status & MPI3_IOCSTATUS_STATUS_MASK),
+		    mrioc->init_cmds.ioc_loginfo);
+		retval = -1;
+		goto out_unlock;
+	}
+
+out_unlock:
+	mrioc->init_cmds.state = MPI3MR_CMD_NOTUSED;
+	mutex_unlock(&mrioc->init_cmds.mutex);
+
+out:
+	return retval;
+}
+
 /**
  * mpi3mr_watchdog_work - watchdog thread to monitor faults
  * @work: work struct
@@ -1489,6 +1557,11 @@ static void mpi3mr_watchdog_work(struct work_struct *work)
 	enum mpi3mr_iocstate ioc_state;
 	u32 fault, host_diagnostic;
 
+	if (mrioc->ts_update_counter++ >= MPI3MR_TSUPDATE_INTERVAL) {
+		mrioc->ts_update_counter = 0;
+		mpi3mr_sync_timestamp(mrioc);
+	}
+
 	/*Check for fault state every one second and issue Soft reset*/
 	ioc_state = mpi3mr_get_iocstate(mrioc);
 	if (ioc_state == MRIOC_STATE_FAULT) {
@@ -3293,6 +3366,7 @@ int mpi3mr_soft_reset_handler(struct mpi3mr_ioc *mrioc,
 		mrioc->reset_in_progress = 0;
 		scsi_unblock_requests(mrioc->shost);
 		mpi3mr_rfresh_tgtdevs(mrioc);
+		mrioc->ts_update_counter = 0;
 		spin_lock_irqsave(&mrioc->watchdog_lock, flags);
 		if (mrioc->watchdog_work_q)
 			queue_delayed_work(mrioc->watchdog_work_q,