Commit f5975d18 authored by Damien Le Moal's avatar Damien Le Moal Committed by Jens Axboe
Browse files

docs: sysfs-block-device: document ncq_prio_supported 



Add documentation for the new device attribute file ncq_prio_supported,
and its SAS HBA equivalent sas_ncq_prio_supported.

Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210816014456.2191776-12-damien.lemoal@wdc.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5b8a2345

Documentation/ABI/testing/sysfs-block-device

+24 −1
Original line number Diff line number Diff line
@@ -58,7 +58,8 @@ Description: 
		(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.

		priority feature, writing "1" to this file results in an error

		(see ncq_prio_supported).





What:		/sys/block/*/device/sas_ncq_prio_enable
@@ -71,4 +72,26 @@ Description: 
		(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 (see sas_ncq_prio_supported).





What:		/sys/block/*/device/ncq_prio_supported

Date:		Aug, 2021

KernelVersion:	v5.15

Contact:	linux-ide@vger.kernel.org

Description:

		(RO) Indicates if the device supports the SATA NCQ (native

		command queueing) priority feature.





What:		/sys/block/*/device/sas_ncq_prio_supported

Date:		Aug, 2021

KernelVersion:	v5.15

Contact:	linux-ide@vger.kernel.org

Description:

		(RO) This is the equivalent of the ncq_prio_supported 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.