Make it easier to test write pipelining by adding support for setting the
BLK_FEAT_ORDERED_HWQ flag.
Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/scsi/scsi_debug.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 353cb60e1abe..2eeed9f63c69 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1004,6 +1004,7 @@ static int dix_reads;
static int dif_errors;
/* ZBC global data */
+static bool sdeb_preserves_write_order;
static bool sdeb_zbc_in_use; /* true for host-aware and host-managed disks */
static int sdeb_zbc_zone_cap_mb;
static int sdeb_zbc_zone_size_mb;
@@ -6630,10 +6631,15 @@ static struct sdebug_dev_info *find_build_dev_info(struct scsi_device *sdev)
static int scsi_debug_sdev_init(struct scsi_device *sdp)
{
+ struct request_queue *q = sdp->request_queue;
+
if (sdebug_verbose)
pr_info("sdev_init <%u %u %u %llu>\n",
sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
+ if (sdeb_preserves_write_order)
+ q->limits.features |= BLK_FEAT_ORDERED_HWQ;
+
return 0;
}
@@ -7362,6 +7368,8 @@ module_param_named(statistics, sdebug_statistics, bool, S_IRUGO | S_IWUSR);
module_param_named(strict, sdebug_strict, bool, S_IRUGO | S_IWUSR);
module_param_named(submit_queues, submit_queues, int, S_IRUGO);
module_param_named(poll_queues, poll_queues, int, S_IRUGO);
+module_param_named(preserves_write_order, sdeb_preserves_write_order, bool,
+ S_IRUGO);
module_param_named(tur_ms_to_ready, sdeb_tur_ms_to_ready, int, S_IRUGO);
module_param_named(unmap_alignment, sdebug_unmap_alignment, int, S_IRUGO);
module_param_named(unmap_granularity, sdebug_unmap_granularity, int, S_IRUGO);
@@ -7434,6 +7442,8 @@ MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err...
MODULE_PARM_DESC(per_host_store, "If set, next positive add_host will get new store (def=0)");
MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
MODULE_PARM_DESC(poll_queues, "support for iouring iopoll queues (1 to max(submit_queues - 1))");
+MODULE_PARM_DESC(preserves_write_order,
+ "Whether or not to inform the block layer that this driver preserves the order of WRITE commands (def=0)");
MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
MODULE_PARM_DESC(random, "If set, uniformly randomize command duration between 0 and delay_in_ns");
MODULE_PARM_DESC(removable, "claim to have removable media (def=0)");
