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| author | Bart Van Assche <bvanassche@acm.org> | 2022-07-26 15:52:21 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-08-01 19:27:49 -0400 |
| commit | 86a44f045b8cbfd885b7425f4cd8a1c353593057 (patch) | |
| tree | b2010d413a740796678c49d9438cc3b938a20ccd /drivers/ufs | |
| parent | f00e0d7714895d10790e2bac4df00727ddb9abff (diff) | |
| download | linux-86a44f045b8cbfd885b7425f4cd8a1c353593057.tar.bz2 | |
scsi: ufs: core: Increase the maximum data buffer size
Measurements for one particular UFS controller + UFS device show a 25%
higher read bandwidth if the maximum data buffer size is increased from 512
KiB to 1 MiB. Hence increase the maximum size of the data buffer associated
with a single request from SCSI_DEFAULT_MAX_SECTORS (1024) * 512 bytes =
512 KiB to 1 MiB.
Notes:
- The maximum data buffer size supported by the UFSHCI specification
is 65535 * 256 KiB or about 16 GiB.
- The maximum data buffer size for READ(10) commands is 65535 logical
blocks. To transfer more than 65535 * 4096 bytes = 255 MiB with a single
SCSI command, the READ(16) command is required. Support for READ(16) is
optional in the UFS 3.1 and UFS 4.0 standards.
Link: https://lore.kernel.org/r/20220726225232.1362251-1-bvanassche@acm.org
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Bean Huo <beanhuo@micron.com>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Tested-by: Avri Altman <avri.altman@wdc.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/ufs')
| -rw-r--r-- | drivers/ufs/core/ufshcd.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index f4f8ded97ef2..dbe74f6b0c47 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -8304,6 +8304,7 @@ static struct scsi_host_template ufshcd_driver_template = { .cmd_per_lun = UFSHCD_CMD_PER_LUN, .can_queue = UFSHCD_CAN_QUEUE, .max_segment_size = PRDT_DATA_BYTE_COUNT_MAX, + .max_sectors = (1 << 20) / SECTOR_SIZE, /* 1 MiB */ .max_host_blocked = 1, .track_queue_depth = 1, .sdev_groups = ufshcd_driver_groups, |