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    Subject[-v2 PATCH 1/6] x86, cpu: Add AMD core boosting feature flag to /proc/cpuinfo
    Date
    From: Borislav Petkov <borislav.petkov@amd.com>

    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 <borislav.petkov@amd.com>
    Reviewed-by: Thomas Renninger <trenn@suse.de>
    ---
    arch/x86/include/asm/cpufeature.h | 1 +
    arch/x86/kernel/cpu/addon_cpuid_features.c | 5 +++--
    2 files changed, 4 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
    index 0cd82d0..630e623 100644
    --- 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 */
    diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
    index 97ad79c..ead2a1c 100644
    --- 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_features(struct cpuinfo_x86 *c)
    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 },
    --
    1.7.0


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