diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2023-09-21 12:22:49 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-09-27 11:12:50 -0400 |
| commit | 00d2fa28da0aa371ad215e92ebf5297c0e7d4861 (patch) | |
| tree | 3f7d0783ec639557dd462518b2b9c709c506fc3f /include/ufs/ufs.h | |
| parent | c788cf8a21cd3b12a1823869878e3fd93132859f (diff) | |
scsi: ufs: core: Set the Command Priority (CP) flag for RT requests
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>
Diffstat (limited to 'include/ufs/ufs.h')
| -rw-r--r-- | include/ufs/ufs.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h index 0cced88f4531..e77ab1786856 100644 --- a/include/ufs/ufs.h +++ b/include/ufs/ufs.h @@ -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, }; |