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| author | Andrey Konovalov <andrey.konovalov@linaro.org> | 2012-12-20 00:10:48 +0400 |
|---|---|---|
| committer | Andrey Konovalov <andrey.konovalov@linaro.org> | 2012-12-20 00:10:48 +0400 |
| commit | c19ae9c2483f0253bb58d3d3c28ac20386df6066 (patch) | |
| tree | 9e3339fd0c9ac3285839626b25bb8d30bea60abd /arch/x86/kernel/cpu/amd.c | |
| parent | 836f44a71d886bc81551597612e3b1797133985f (diff) | |
| parent | b2824f4e0990716407b0c0e7acee75bb6353febf (diff) | |
| download | linux-linaro-tracking-with-fixes-linux-linaro-core-3.6.tar.gz | |
Automatically merging tracking-linux-3.6.y into merge-linux-linaro-core-3.6linux-linaro-core-3.6-20121220.0linux-linaro-core-3.6
Conflicting files:
Diffstat (limited to 'arch/x86/kernel/cpu/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 9d92e19039f..e4da4385894 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -631,6 +631,20 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c) } } + /* + * The way access filter has a performance penalty on some workloads. + * Disable it on the affected CPUs. + */ + if ((c->x86 == 0x15) && + (c->x86_model >= 0x02) && (c->x86_model < 0x20)) { + u64 val; + + if (!rdmsrl_safe(0xc0011021, &val) && !(val & 0x1E)) { + val |= 0x1E; + wrmsrl_safe(0xc0011021, val); + } + } + cpu_detect_cache_sizes(c); /* Multi core CPU? */ |