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-rw-r--r--Documentation/ABI/testing/sysfs-block-device20
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.