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UPSTREAM: scsi: ufs: core: Increase the maximum data buffer size

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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>
Change-Id: I8c9db803e7f55d911e86d4fa0272d38d13ee05d5
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Bug: 258234315
(cherry picked from commit 86a44f045b)
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Bart Van Assche
2022-07-26 15:52:21 -07:00
committed by Alistair Delva
parent 8cd06a39b1
commit ff00ba18aa
1 changed files with 1 additions and 0 deletions
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drivers/ufs/core/ufshcd.c
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@@ -8405,6 +8405,7 @@ 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,