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authorMark Langsdorf <mark.langsdorf@amd.com>2009-04-09 15:31:53 +0200
committerIngo Molnar <mingo@elte.hu>2009-04-10 14:22:40 +0200
commit2fad2d9bb8310889f3261035b594b4e068b6eb8b (patch)
tree3434e3c0a280b10c73b81e7af3c37e23209f0dec /Documentation/ABI
parentba518bea2db21c72d44a6cbfd825b026ef9cdcb6 (diff)
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>
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diff --git a/Documentation/ABI/testing/sysfs-devices-cache_disable b/Documentation/ABI/testing/sysfs-devices-cache_disable
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+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