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| author | Lu Hongfei <luhongfei@vivo.com> | 2023-06-13 10:22:34 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-06-16 12:04:31 -0400 |
| commit | e3d55626cff32cf7defff7f2053672adc4a712da (patch) | |
| tree | 21c5dfbfa6090e2dc878ba81fbc913d20c20be0f /Documentation/ABI | |
| parent | 56541c7c4468a9de26d82ba6e8c10ace286f8fdd (diff) | |
| download | lwn-e3d55626cff32cf7defff7f2053672adc4a712da.tar.gz lwn-e3d55626cff32cf7defff7f2053672adc4a712da.zip | |
scsi: ufs: wb: Add explicit flush_threshold sysfs attribute
There are three flags that control Write Booster Feature:
1. WB ON/OFF
2. WB Hibern Flush ON/OFF (implicitly)
3. WB Flush ON/OFF (explicit)
In the case of "Hibern Flush", one of the conditions for flush WB buffer is
that avail_wb_buff < wb_flush_threshold.
As we know, different users have different requirements for power
consumption and performance. Therefore, we need the ability to manually set
wb_flush_threshold, so that users can easily and flexibly adjust the
wb_flush_threshold value, thereby achieving a balance between power
consumption and performance.
So the sysfs attribute that controls this is necessary.
wb_flush_threshold represents the threshold for flushing WB buffer, whose
value expressed in unit of 10% granularity, such as '1' representing 10%,
'2' representing 20%, and so on.
Signed-off-by: Lu Hongfei <luhongfei@vivo.com>
Link: https://lore.kernel.org/r/20230613022240.16595-1-luhongfei@vivo.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-ufs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs index 228aa43e14ed..d5f44fc5b9dc 100644 --- a/Documentation/ABI/testing/sysfs-driver-ufs +++ b/Documentation/ABI/testing/sysfs-driver-ufs @@ -1426,6 +1426,17 @@ Description: This entry shows the status of WriteBooster buffer flushing If flushing is enabled, the device executes the flush operation when the command queue is empty. +What: /sys/bus/platform/drivers/ufshcd/*/wb_flush_threshold +What: /sys/bus/platform/devices/*.ufs/wb_flush_threshold +Date: June 2023 +Contact: Lu Hongfei <luhongfei@vivo.com> +Description: + wb_flush_threshold represents the threshold for flushing WriteBooster buffer, + whose value expressed in unit of 10% granularity, such as '1' representing 10%, + '2' representing 20%, and so on. + If avail_wb_buff < wb_flush_threshold, it indicates that WriteBooster buffer needs to + be flushed, otherwise it is not necessary. + What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/hpb_version What: /sys/bus/platform/devices/*.ufs/device_descriptor/hpb_version Date: June 2021 |