From: Borislav Petkov Date: Wed, 31 Mar 2010 19:56:41 +0000 (+0200) Subject: x86, cpu: Add AMD core boosting feature flag to /proc/cpuinfo Git-commit: 5958f1d5d722df7a9e5d129676614a8e5219bacd Patch-mainline: 2.6.35-rc1 x86, cpu: Add AMD core boosting feature flag to /proc/cpuinfo By semi-popular demand, this adds the Core Performance Boost feature flag to /proc/cpuinfo. Possible use case for this is userspace tools like cpufreq-aperf, for example, so that they don't have to jump through hoops of accessing "/dev/cpu/%d/cpuid" in order to check for CPB hw support, or call cpuid from userspace. Signed-off-by: Borislav Petkov LKML-Reference: <1270065406-1814-2-git-send-email-bp@amd64.org> Reviewed-by: Thomas Renninger Signed-off-by: H. Peter Anvin Acked-by: Jeff Mahoney --- arch/x86/include/asm/cpufeature.h | 1 + arch/x86/kernel/cpu/addon_cpuid_features.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-) --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -161,6 +161,7 @@ */ #define X86_FEATURE_IDA (7*32+ 0) /* Intel Dynamic Acceleration */ #define X86_FEATURE_ARAT (7*32+ 1) /* Always Running APIC Timer */ +#define X86_FEATURE_CPB (7*32+ 2) /* AMD Core Performance Boost */ /* Virtualization flags: Linux defined */ #define X86_FEATURE_TPR_SHADOW (8*32+ 0) /* Intel TPR Shadow */ --- a/arch/x86/kernel/cpu/addon_cpuid_features.c +++ b/arch/x86/kernel/cpu/addon_cpuid_features.c @@ -30,8 +30,9 @@ void __cpuinit init_scattered_cpuid_feat const struct cpuid_bit *cb; static const struct cpuid_bit __cpuinitconst cpuid_bits[] = { - { X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 }, - { X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006 }, + { X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 }, + { X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006 }, + { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007 }, { X86_FEATURE_NPT, CR_EDX, 0, 0x8000000a }, { X86_FEATURE_LBRV, CR_EDX, 1, 0x8000000a }, { X86_FEATURE_SVML, CR_EDX, 2, 0x8000000a },