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| author |   Hans Rosenfeld <hans.rosenfeld@amd.com> | 2011-02-07 18:10:39 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2011-02-07 19:16:22 +0100 |
| commit | cabb5bd7ff4d6963ec9e67f958fc30e7815425e6 (patch) | |
| tree | 99e17e547d537eaa58184dba673e1b0142f2bc48 /arch/x86/include/asm/amd_nb.h | |
| parent | x86, amd: Extend AMD northbridge caching code to support "Link Control" devices (diff) | |
| download | linux-dev-cabb5bd7ff4d6963ec9e67f958fc30e7815425e6.tar.xz linux-dev-cabb5bd7ff4d6963ec9e67f958fc30e7815425e6.zip | |
x86, amd: Support L3 Cache Partitioning on AMD family 0x15 CPUs
L3 Cache Partitioning allows selecting which of the 4 L3 subcaches can be used
for evictions by the L2 cache of each compute unit. By writing a 4-bit
hexadecimal mask into the the sysfs file
/sys/devices/system/cpu/cpuX/cache/index3/subcaches, the user can set the
enabled subcaches for a CPU.
The settings are directly read from and written to the hardware, so there is no
way to have contradicting settings for two CPUs belonging to the same compute
unit. Writing will always overwrite any previous setting for a compute unit.
Signed-off-by: Hans Rosenfeld <hans.rosenfeld@amd.com>
Cc: <Andreas.Herrmann3@amd.com>
LKML-Reference: <1297098639-431383-1-git-send-email-hans.rosenfeld@amd.com>
[ -v3: minor style fixes ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/amd_nb.h')
| -rw-r--r-- | arch/x86/include/asm/amd_nb.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h index 3e7070071d73..423f11ca6eeb 100644 --- a/arch/x86/include/asm/amd_nb.h +++ b/arch/x86/include/asm/amd_nb.h @@ -18,6 +18,8 @@ extern int amd_cache_northbridges(void); extern void amd_flush_garts(void); extern int amd_numa_init(unsigned long start_pfn, unsigned long end_pfn); extern int amd_scan_nodes(void); +extern int amd_get_subcaches(int); +extern int amd_set_subcaches(int, int); #ifdef CONFIG_NUMA_EMU extern void amd_fake_nodes(const struct bootnode *nodes, int nr_nodes); @@ -38,6 +40,7 @@ extern struct amd_northbridge_info amd_northbridges; #define AMD_NB_GART 0x1 #define AMD_NB_L3_INDEX_DISABLE 0x2 +#define AMD_NB_L3_PARTITIONING 0x4 #ifdef CONFIG_AMD_NB |