[PATCH v6 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>
Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>
Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>

Cc: sathya.prakash@xxxxxxxxxxxx
---
 drivers/scsi/mpi3mr/mpi3mr.h    |  1 +
 drivers/scsi/mpi3mr/mpi3mr_fw.c |  2 ++
 drivers/scsi/mpi3mr/mpi3mr_os.c | 55 +++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)

diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index 5a3a137..372ce0e 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -107,6 +107,7 @@ 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 605015e..813b0bc 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_fw.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c
@@ -3765,6 +3765,8 @@ 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 e36a502..e63db7c 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -2409,6 +2409,43 @@ 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
@@ -2423,8 +2460,26 @@ static void mpi3mr_print_pending_host_io(struct mpi3mr_ioc *mrioc)
 static int mpi3mr_eh_host_reset(struct scsi_cmnd *scmd)
 {
 	struct mpi3mr_ioc *mrioc = shost_priv(scmd->device->host);
+	struct mpi3mr_stgt_priv_data *stgt_priv_data;
+	struct mpi3mr_sdev_priv_data *sdev_priv_data;
+	u8 dev_type = MPI3_DEVICE_DEVFORM_VD;
 	int retval = FAILED, ret;
 
+	sdev_priv_data = scmd->device->hostdata;
+	if (sdev_priv_data && sdev_priv_data->tgt_priv_data) {
+		stgt_priv_data = sdev_priv_data->tgt_priv_data;
+		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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