diff options
| author | Thomas Renninger <trenn@suse.de> | 2011-07-21 11:54:53 +0200 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2011-07-29 19:37:25 +0200 |
| commit | 8fb2e440b223b966f74a04a48f6f71f288fa671b (patch) | |
| tree | 3a9f2c19c039072d0b2641385bf0e6897bed2361 /tools/power/cpupower/utils/helpers/msr.c | |
| parent | 76b659a31df5174d71832b7882ef31b32e1f8d59 (diff) | |
| download | lwn-8fb2e440b223b966f74a04a48f6f71f288fa671b.tar.gz lwn-8fb2e440b223b966f74a04a48f6f71f288fa671b.zip | |
cpupower: Show Intel turbo ratio support via ./cpupower frequency-info
This adds the last piece missing from turbostat (if called with -v).
It shows on Intel machines supporting Turbo Boost how many cores
have to be active/idle to enter which boost mode (frequency).
Whether the HW really enters these boost modes can be verified via
./cpupower monitor.
Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: lenb@kernel.org
CC: linux@dominikbrodowski.net
CC: cpufreq@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'tools/power/cpupower/utils/helpers/msr.c')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/msr.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/msr.c b/tools/power/cpupower/utils/helpers/msr.c index 93d48bd56e57..7869ca64dfd3 100644 --- a/tools/power/cpupower/utils/helpers/msr.c +++ b/tools/power/cpupower/utils/helpers/msr.c @@ -11,6 +11,7 @@ #define MSR_IA32_PERF_STATUS 0x198 #define MSR_IA32_MISC_ENABLES 0x1a0 #define MSR_IA32_ENERGY_PERF_BIAS 0x1b0 +#define MSR_NEHALEM_TURBO_RATIO_LIMIT 0x1ad /* * read_msr @@ -79,6 +80,7 @@ int msr_intel_has_boost_support(unsigned int cpu) ret = read_msr(cpu, MSR_IA32_MISC_ENABLES, &misc_enables); if (ret) return ret; + return (misc_enables >> 38) & 0x1; } @@ -119,4 +121,18 @@ int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val) return ret; return 0; } + +unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu) +{ + unsigned long long val; + int ret; + + if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_HAS_TURBO_RATIO)) + return -1; + + ret = read_msr(cpu, MSR_NEHALEM_TURBO_RATIO_LIMIT, &val); + if (ret) + return ret; + return val; +} #endif |