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| author | Dirk Brandewie <dirk.j.brandewie@intel.com> | 2014-11-06 18:40:46 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-11-12 00:04:37 +0100 |
| commit | 77873887729aaddec5cd27203a6ce8c4987733e4 (patch) | |
| tree | 85d104df9e3b6417d52a7801c55b0cdd4a579f80 /arch/x86/kernel/cpu/scattered.c | |
| parent | cpufreq: respect the min/max settings from user space (diff) | |
| download | linux-77873887729aaddec5cd27203a6ce8c4987733e4.tar.xz linux-77873887729aaddec5cd27203a6ce8c4987733e4.zip | |
x86: Add support for Intel HWP feature detection.
Add support of Hardware Managed Performance States (HWP) described in Volume 3
section 14.4 of the SDM.
One bit CPUID.06H:EAX[bit 7] expresses the presence of the HWP feature on
the processor. The remaining bits CPUID.06H:EAX[bit 8-11] denote the
presense of various HWP features.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu/scattered.c')
| -rw-r--r-- | arch/x86/kernel/cpu/scattered.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c index 4a8013d55947..60639093d536 100644 --- a/arch/x86/kernel/cpu/scattered.c +++ b/arch/x86/kernel/cpu/scattered.c @@ -36,6 +36,11 @@ void init_scattered_cpuid_features(struct cpuinfo_x86 *c) { X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006, 0 }, { X86_FEATURE_PLN, CR_EAX, 4, 0x00000006, 0 }, { X86_FEATURE_PTS, CR_EAX, 6, 0x00000006, 0 }, + { X86_FEATURE_HWP, CR_EAX, 7, 0x00000006, 0 }, + { X86_FEATURE_HWP_NOITFY, CR_EAX, 8, 0x00000006, 0 }, + { X86_FEATURE_HWP_ACT_WINDOW, CR_EAX, 9, 0x00000006, 0 }, + { X86_FEATURE_HWP_EPP, CR_EAX,10, 0x00000006, 0 }, + { X86_FEATURE_HWP_PKG_REQ, CR_EAX,11, 0x00000006, 0 }, { X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006, 0 }, { X86_FEATURE_EPB, CR_ECX, 3, 0x00000006, 0 }, { X86_FEATURE_HW_PSTATE, CR_EDX, 7, 0x80000007, 0 }, |