[PATCH v2 20/24] mpi3mr: wait for pending IO completions upon detection of VD IO timeout

[Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>]

Wait for (default 180 seconds) host IO completion if IO timeout is detected
on VDs

Signed-off-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Cc: sathya.prakash@xxxxxxxxxxxx
---
 drivers/scsi/mpi3mr/mpi3mr.h    |  1 +
 drivers/scsi/mpi3mr/mpi3mr_fw.c |  2 ++
 drivers/scsi/mpi3mr/mpi3mr_os.c | 45 +++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index ff3e68a6d0b5..505df0e7b852 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -102,6 +102,7 @@ extern struct list_head mrioc_list;
 #define MPI3MR_RESET_HOST_IOWAIT_TIMEOUT	5
 #define MPI3MR_TSUPDATE_INTERVAL		900
 #define MPI3MR_DEFAULT_SHUTDOWN_TIME		120
+#define	MPI3MR_RAID_ERRREC_RESET_TIMEOUT	180
 
 #define MPI3MR_WATCHDOG_INTERVAL		1000 /* in milli seconds */
 
diff --git a/drivers/scsi/mpi3mr/mpi3mr_fw.c b/drivers/scsi/mpi3mr/mpi3mr_fw.c
index 79a9f98c736e..f09330bb4b8a 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_fw.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c
@@ -3775,6 +3775,8 @@ int mpi3mr_soft_reset_handler(struct mpi3mr_ioc *mrioc,
 		}
 	}
 
+	mpi3mr_wait_for_host_io(mrioc, MPI3MR_RESET_HOST_IOWAIT_TIMEOUT);
+
 	mpi3mr_ioc_disable_intr(mrioc);
 
 	if (snapdump) {
diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 8cf591a031b5..0976352f423f 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -2434,6 +2434,43 @@ static void mpi3mr_print_pending_host_io(struct mpi3mr_ioc *mrioc)
 	    mpi3mr_print_scmd, (void *)mrioc);
 }
 
+/**
+ * mpi3mr_wait_for_host_io - block for I/Os to complete
+ * @mrioc: Adapter instance reference
+ * @timeout: time out in seconds
+ * Waits for pending I/Os for the given adapter to complete or
+ * to hit the timeout.
+ *
+ * Return: Nothing
+ */
+void mpi3mr_wait_for_host_io(struct mpi3mr_ioc *mrioc, u32 timeout)
+{
+	enum mpi3mr_iocstate iocstate;
+	int i = 0;
+
+	iocstate = mpi3mr_get_iocstate(mrioc);
+	if (iocstate != MRIOC_STATE_READY)
+		return;
+
+	if (!mpi3mr_get_fw_pending_ios(mrioc))
+		return;
+	ioc_info(mrioc,
+	    "%s :Waiting for %d seconds prior to reset for %d I/O\n",
+	    __func__, timeout, mpi3mr_get_fw_pending_ios(mrioc));
+
+	for (i = 0; i < timeout; i++) {
+		if (!mpi3mr_get_fw_pending_ios(mrioc))
+			break;
+		iocstate = mpi3mr_get_iocstate(mrioc);
+		if (iocstate != MRIOC_STATE_READY)
+			break;
+		msleep(1000);
+	}
+
+	ioc_info(mrioc, "%s :Pending I/Os after wait is: %d\n", __func__,
+	    mpi3mr_get_fw_pending_ios(mrioc));
+}
+
 /**
  * mpi3mr_eh_host_reset - Host reset error handling callback
  * @scmd: SCSI command reference
@@ -2459,6 +2496,14 @@ static int mpi3mr_eh_host_reset(struct scsi_cmnd *scmd)
 		dev_type = stgt_priv_data->dev_type;
 	}
 
+	if (dev_type == MPI3_DEVICE_DEVFORM_VD) {
+		mpi3mr_wait_for_host_io(mrioc,
+		    MPI3MR_RAID_ERRREC_RESET_TIMEOUT);
+		if (!mpi3mr_get_fw_pending_ios(mrioc)) {
+			retval = SUCCESS;
+			goto out;
+		}
+	}
 	mpi3mr_print_pending_host_io(mrioc);
 	ret = mpi3mr_soft_reset_handler(mrioc,
 	    MPI3MR_RESET_FROM_EH_HOS, 1);
-- 
2.18.1

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