x86/docs: add description for cache_disable sysfs interface
[linux-2.6.git] / Documentation / ABI / testing / sysfs-devices-cache_disable
1 What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
2 Date:      August 2008
3 KernelVersion:  2.6.27
4 Contact:        mark.langsdorf@amd.com
5 Description:    These files exist in every cpu's cache index directories.
6                 There are currently 2 cache_disable_# files in each
7                 directory.  Reading from these files on a supported
8                 processor will return that cache disable index value
9                 for that processor and node.  Writing to one of these
10                 files will cause the specificed cache index to be disabled.
11
12                 Currently, only AMD Family 10h Processors support cache index
13                 disable, and only for their L3 caches.  See the BIOS and
14                 Kernel Developer's Guide at
15                 http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
16                 for formatting information and other details on the
17                 cache index disable.
18 Users:    joachim.deguara@amd.com