diff options
| author | Venkatesh Pallipadi <venki@google.com> | 2010-06-03 23:22:28 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-06-16 13:37:32 -0700 |
| commit | 23016bf0d25d62c45d8b8f61d55b290d704f7a79 (patch) | |
| tree | 71229d01b759c29ee2b13645d530aea81d557b94 /arch/x86/include/asm/msr-index.h | |
| parent | 12d8a961289644d265d8b3e88201878837c3b814 (diff) | |
x86: Look for IA32_ENERGY_PERF_BIAS support
The new IA32_ENERGY_PERF_BIAS MSR allows system software to give
hardware a hint whether OS policy favors more power saving,
or more performance. This allows the OS to have some influence
on internal hardware power/performance tradeoffs where the OS
has previously had no influence.
The support for this feature is indicated by CPUID.06H.ECX.bit3,
as documented in the Intel Architectures Software Developer's Manual.
This patch discovers support of this feature and displays it
as "epb" in /proc/cpuinfo.
Signed-off-by: Venkatesh Pallipadi <venki@google.com>
LKML-Reference: <alpine.LFD.2.00.1006032310160.6669@localhost.localdomain>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/msr-index.h')
| -rw-r--r-- | arch/x86/include/asm/msr-index.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index b49d8ca228f6..e57bc20683d6 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -238,6 +238,8 @@ #define MSR_IA32_TEMPERATURE_TARGET 0x000001a2 +#define MSR_IA32_ENERGY_PERF_BIAS 0x000001b0 + /* MISC_ENABLE bits: architectural */ #define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << 0) #define MSR_IA32_MISC_ENABLE_TCC (1ULL << 1) |