[tip:x86/cache] Documentation, ABI: Document the new sysfs files for cpu cache ids

[tip-bot for Tony Luck]

Commit-ID:  1d78dc59f5ab6f467e49882518453adc7e4caa44
Gitweb:     http://git.kernel.org/tip/1d78dc59f5ab6f467e49882518453adc7e4caa44
Author:     Tony Luck <tony.luck@xxxxxxxxx>
AuthorDate: Sat, 22 Oct 2016 06:19:48 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 26 Oct 2016 23:12:37 +0200

Documentation, ABI: Document the new sysfs files for cpu cache ids

Add an ABI document entry for /sys/devices/system/cpu/cpu*/cache/index*/id.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: "Ravi V Shankar" <ravi.v.shankar@xxxxxxxxx>
Cc: "David Carrillo-Cisneros" <davidcc@xxxxxxxxxx>
Cc: "Sai Prakhya" <sai.praneeth.prakhya@xxxxxxxxx>
Cc: "Peter Zijlstra" <peterz@xxxxxxxxxxxxx>
Cc: "Stephane Eranian" <eranian@xxxxxxxxxx>
Cc: "Dave Hansen" <dave.hansen@xxxxxxxxx>
Cc: "Shaohua Li" <shli@xxxxxx>
Cc: "Nilay Vaish" <nilayvaish@xxxxxxxxx>
Cc: "Vikas Shivappa" <vikas.shivappa@xxxxxxxxxxxxxxx>
Cc: "Ingo Molnar" <mingo@xxxxxxx>
Cc: "Borislav Petkov" <bp@xxxxxxx>
Cc: "H. Peter Anvin" <h.peter.anvin@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1477142405-32078-2-git-send-email-fenghua.yu@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 Documentation/ABI/testing/sysfs-devices-system-cpu | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 4987417..2a4a423 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -272,6 +272,22 @@ Description:	Parameters for the CPU cache attributes
 				     the modified cache line is written to main
 				     memory only when it is replaced
 
+
+What:		/sys/devices/system/cpu/cpu*/cache/index*/id
+Date:		September 2016
+Contact:	Linux kernel mailing list <linux-kernel@xxxxxxxxxxxxxxx>
+Description:	Cache id
+
+		The id provides a unique number for a specific instance of
+		a cache of a particular type. E.g. there may be a level
+		3 unified cache on each socket in a server and we may
+		assign them ids 0, 1, 2, ...
+
+		Note that id value can be non-contiguous. E.g. level 1
+		caches typically exist per core, but there may not be a
+		power of two cores on a socket, so these caches may be
+		numbered 0, 1, 2, 3, 4, 5, 8, 9, 10, ...
+
 What:		/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats
 		/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/turbo_stat
 		/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/sub_turbo_stat