With the introduced module parameter of 'use_blk_mq', it is easy
to switch between 'blk_mq' and 'non_blk_mq' by reloading scsi_debug
module, so that we can test scsi_mq/blk_mq related regressions easily.
Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Cc: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Omar Sandoval <osandov@xxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
drivers/scsi/scsi_debug.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 24d7496cd9e2..236cfb669df3 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -144,6 +144,7 @@ static const char *sdebug_version_date = "20180128";
#define DEF_SUBMIT_QUEUES 1
#define DEF_UUID_CTL 0
#define JDELAY_OVERRIDDEN -9999
+#define DEF_USE_BLK_MQ 0
#define SDEBUG_LUN_0_VAL 0
@@ -671,6 +672,7 @@ static bool sdebug_verbose;
static bool have_dif_prot;
static bool write_since_sync;
static bool sdebug_statistics = DEF_STATISTICS;
+static bool sdebug_use_blk_mq = DEF_USE_BLK_MQ;
static unsigned int sdebug_store_sectors;
static sector_t sdebug_capacity; /* in sectors */
@@ -4537,6 +4539,7 @@ module_param_named(vpd_use_hostno, sdebug_vpd_use_hostno, int,
S_IRUGO | S_IWUSR);
module_param_named(write_same_length, sdebug_write_same_length, int,
S_IRUGO | S_IWUSR);
+module_param_named(use_blk_mq, sdebug_use_blk_mq, bool, S_IRUGO | S_IWUSR);
MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
MODULE_DESCRIPTION("SCSI debug adapter driver");
@@ -5849,6 +5852,8 @@ static int sdebug_driver_probe(struct device *dev)
sdebug_driver_template.can_queue = sdebug_max_queue;
if (sdebug_clustering)
sdebug_driver_template.use_clustering = ENABLE_CLUSTERING;
+ if (sdebug_use_blk_mq)
+ sdebug_driver_template.force_blk_mq = 1;
hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
if (NULL == hpnt) {
pr_err("scsi_host_alloc failed\n");
--
2.9.5
