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| author | Olof Johansson <olof@lixom.net> | 2012-12-12 16:10:45 -0800 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2012-12-12 16:10:45 -0800 |
| commit | 9c7466b217af784280d9fc841bbd559ef3bf33e9 (patch) | |
| tree | c21ee243e48912201b4041fbf3f9bd9165603bd8 /arch/x86/kernel/cpu/amd.c | |
| parent | 4a76411ea3f1da9032e031f8fff8894b97d141b2 (diff) | |
| parent | 48d224d1efec98b0b78e511150b4f5752beceb7c (diff) | |
ARM: arm-soc: Merge branch 'next/pm2' into next/pm
Another smaller branch merged into next/pm before pull request.
Signed-off-by: Olof Johansson <olof@lixom.net>
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 f7e98a2c0d1..1b7d1656a04 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? */ |