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| author | Niklas Cassel <niklas.cassel@wdc.com> | 2021-08-16 10:44:55 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-18 07:19:39 -0600 |
| commit | 5b8a2345e64b7c9ad00d1bd2d5081d14c574d989 (patch) | |
| tree | abd55c11d9a4a784df07c43782e6c1ea5b00d85a /Documentation/ABI | |
| parent | 5f91b8f54874300a8e3c6c89f39ce5a74a449f2c (diff) | |
| download | linux-5b8a2345e64b7c9ad00d1bd2d5081d14c574d989.tar.gz | |
docs: sysfs-block-device: improve ncq_prio_enable documentation
NCQ priority is an optional feature of the NCQ feature set and should not be confused with the NCQ feature set itself. Clarify the description of the ncq_prio_enable attribute to avoid this confusion. Also add the missing documentation for the equivalent sas_ncq_prio_enable attribute. Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Link: https://lore.kernel.org/r/20210816014456.2191776-11-damien.lemoal@wdc.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-device | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-device b/Documentation/ABI/testing/sysfs-block-device index aa0fb500e3c9..cf1013df4b92 100644 --- a/Documentation/ABI/testing/sysfs-block-device +++ b/Documentation/ABI/testing/sysfs-block-device @@ -55,6 +55,20 @@ Date: Oct, 2016 KernelVersion: v4.10 Contact: linux-ide@vger.kernel.org Description: - (RW) Write to the file to turn on or off the SATA ncq (native - command queueing) support. By default this feature is turned - off. + (RW) Write to the file to turn on or off the SATA NCQ (native + command queueing) priority support. By default this feature is + turned off. If the device does not support the SATA NCQ + priority feature, writing "1" to this file results in an error. + + +What: /sys/block/*/device/sas_ncq_prio_enable +Date: Oct, 2016 +KernelVersion: v4.10 +Contact: linux-ide@vger.kernel.org +Description: + (RW) This is the equivalent of the ncq_prio_enable attribute + file for SATA devices connected to a SAS host-bus-adapter + (HBA) implementing support for the SATA NCQ priority feature. + This file does not exist if the HBA driver does not implement + support for the SATA NCQ priority feature, regardless of the + device support for this feature. |