summaryrefslogtreecommitdiff
path: root/drivers/ata/libata-scsi.c
diff options
context:
space:
mode:
authorAdam Manzanares <adam.manzanares@hgst.com>2016-10-17 21:27:29 +0300
committerTejun Heo <tj@kernel.org>2016-10-19 21:34:36 +0300
commit8e061784b51ec4a4efed0deaafb5bd9725bf5b06 (patch)
tree30d253d6d6a214f6514484bfe1d2c3b178fdf62e /drivers/ata/libata-scsi.c
parent5dc8b362a2374d007bc0db649b7ab6a79dd32bda (diff)
downloadlinux-8e061784b51ec4a4efed0deaafb5bd9725bf5b06.tar.xz
ata: Enabling ATA Command Priorities
This patch checks to see if an ATA device supports NCQ command priorities. If so and the user has specified an iocontext that indicates IO_PRIO_CLASS_RT then we build a tf with a high priority command. This is done to improve the tail latency of commands that are high priority by passing priority to the device. tj: Removed trivial ata_ncq_prio_enabled() and open-coded the test. Signed-off-by: Adam Manzanares <adam.manzanares@hgst.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r--drivers/ata/libata-scsi.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 9cceb4a875a5..2bccc3c7de48 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -50,6 +50,7 @@
#include <linux/uaccess.h>
#include <linux/suspend.h>
#include <asm/unaligned.h>
+#include <linux/ioprio.h>
#include "libata.h"
#include "libata-transport.h"
@@ -1755,6 +1756,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *scmd = qc->scsicmd;
const u8 *cdb = scmd->cmnd;
+ struct request *rq = scmd->request;
+ int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
unsigned int tf_flags = 0;
u64 block;
u32 n_block;
@@ -1821,7 +1824,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
qc->nbytes = n_block * scmd->device->sector_size;
rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
- qc->tag);
+ qc->tag, class);
+
if (likely(rc == 0))
return 0;