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