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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2016-05-03 20:33:37 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-04 00:59:30 +0300
commit8e996a2874bbbed30e8dfe881453825fc6b7654e (patch)
tree3dd50be8cc4462eba2b1a87dc682258cfd986043 /Documentation/ABI
parent6327a454a8ab0dcab24a647367d216c1b84020c6 (diff)
downloadlinux-8e996a2874bbbed30e8dfe881453825fc6b7654e.tar.xz
stm class: Support devices that override software assigned masters
Some STM devices adjust software assigned master numbers depending on the trace source and its runtime state and whatnot. This patch adds a sysfs attribute to inform the trace-side software that master numbers assigned to software sources will not match those in the STP stream, so that, for example, master/channel allocation policy can be adjusted accordingly. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/sysfs-class-stm10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-stm b/Documentation/ABI/testing/sysfs-class-stm
index c9aa4f3fc9a7..77ed3da0f68e 100644
--- a/Documentation/ABI/testing/sysfs-class-stm
+++ b/Documentation/ABI/testing/sysfs-class-stm
@@ -12,3 +12,13 @@ KernelVersion: 4.3
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description:
Shows the number of channels per master on this STM device.
+
+What: /sys/class/stm/<stm>/hw_override
+Date: March 2016
+KernelVersion: 4.7
+Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
+Description:
+ Reads as 0 if master numbers in the STP stream produced by
+ this stm device will match the master numbers assigned by
+ the software or 1 if the stm hardware overrides software
+ assigned masters.