[tip:x86/cpu] x86/docs: add description for cache_disable sysfs interface

[Mark Langsdorf <mark.langsdorf@amd.com>]

Commit-ID:  2fad2d9bb8310889f3261035b594b4e068b6eb8b
Gitweb:     http://git.kernel.org/tip/2fad2d9bb8310889f3261035b594b4e068b6eb8b
Author:     Mark Langsdorf <mark.langsdorf@amd.com>
AuthorDate: Thu, 9 Apr 2009 15:31:53 +0200
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 10 Apr 2009 14:22:40 +0200

x86/docs: add description for cache_disable sysfs interface

Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <20090409133153.GL31527@alberich.amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 .../ABI/testing/sysfs-devices-cache_disable        |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-devices-cache_disable b/Documentation/ABI/testing/sysfs-devices-cache_disable
new file mode 100644
index 0000000..175bb4f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-cache_disable
@@ -0,0 +1,18 @@
+What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
+Date:      August 2008
+KernelVersion:	2.6.27
+Contact:	mark.langsdorf@amd.com
+Description:	These files exist in every cpu's cache index directories.
+		There are currently 2 cache_disable_# files in each
+		directory.  Reading from these files on a supported
+		processor will return that cache disable index value
+		for that processor and node.  Writing to one of these
+		files will cause the specificed cache index to be disabled.
+
+		Currently, only AMD Family 10h Processors support cache index
+		disable, and only for their L3 caches.  See the BIOS and
+		Kernel Developer's Guide at
+		http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
+		for formatting information and other details on the
+		cache index disable.
+Users:    joachim.deguara@amd.com