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FROMGIT: scsi: ufs: Set the CP flag for RT requests

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Make the UFS device execute realtime (RT) requests before other requests.
This will be used in Android to reduce the I/O latency of the foreground
app.

Change-Id: Ia8fa42517e6f8e11439bd91b2e23762c00845724
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
(cherry picked from commit 00d2fa28da0aa371ad215e92ebf5297c0e7d4861 git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next)
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Bart Van Assche
2023-09-01 07:30:03 -07:00
committed by Bart Van Assche
parent 67d3336282
commit bfeb57ae95
2 changed files with 6 additions and 1 deletions
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4
drivers/ufs/core/ufshcd.c
View File

@@ -2780,6 +2780,8 @@ static int ufshcd_compose_devman_upiu(struct ufs_hba *hba,
*/
static void ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
struct request *rq = scsi_cmd_to_rq(lrbp->cmd);
unsigned int ioprio_class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
u8 upiu_flags;
if (hba->ufs_version <= ufshci_version(1, 1))
@@ -2789,6 +2791,8 @@ static void ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
lrbp->cmd->sc_data_direction, 0);
if (ioprio_class == IOPRIO_CLASS_RT)
upiu_flags |= UPIU_CMD_FLAGS_CP;
ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
}

3
include/ufs/ufs.h
View File

@@ -97,9 +97,10 @@ enum {
UPIU_TRANSACTION_REJECT_UPIU = 0x3F,
};
/* UPIU Read/Write flags */
/* UPIU Read/Write flags. See also table "UPIU Flags" in the UFS standard. */
enum {
UPIU_CMD_FLAGS_NONE = 0x00,
UPIU_CMD_FLAGS_CP = 0x04,
UPIU_CMD_FLAGS_WRITE = 0x20,
UPIU_CMD_FLAGS_READ = 0x40,
};