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scsi: ufs: core: Set the Command Priority (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.

Note: UFS devices do not support CDL so using CDL is not a viable
alternative.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230921192335.676924-5-bvanassche@acm.org
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2023-09-21 12:22:49 -07:00 committed by Martin K. Petersen
parent c788cf8a21
commit 00d2fa28da
2 changed files with 6 additions and 1 deletions
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4
drivers/ufs/core/ufshcd.c
View File

@ -2717,6 +2717,8 @@ 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))
@ -2726,6 +2728,8 @@ 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

@ -98,9 +98,10 @@ enum upiu_response_transaction {
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,
};