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| author | Nathan Fontenot <nathan.fontenot@amd.com> | 2021-01-25 20:34:49 +0300 |
|---|---|---|
| committer | Shuah Khan <skhan@linuxfoundation.org> | 2021-01-26 19:40:15 +0300 |
| commit | a0255a76bf3a78d322adfe4eb4e73eb83998f61a (patch) | |
| tree | b721317391188d6476567bb9f8b7dc85e7fe1afb /tools/power/cpupower/utils/helpers/amd.c | |
| parent | 7a136a8fcd7ef14c63d07667e81c4dcac77e0a13 (diff) | |
| download | linux-a0255a76bf3a78d322adfe4eb4e73eb83998f61a.tar.xz | |
cpupower: Add CPUPOWER_CAP_AMD_HW_PSTATE cpuid caps flag
Add a check in get_cpu_info() for the ability to read frequencies
from hardware and set the CPUPOWER_CAP_AMD_HW_PSTATE cpuid flag.
The cpuid flag is set when CPUID_80000007_EDX[7] is set,
which is all families >= 10h. The check excludes family 14h
because HW pstate reporting was not implemented on family 14h.
This is intended to reduce family checks in the main code paths.
Signed-off-by: Nathan Fontenot <nathan.fontenot@amd.com>
Reviewed-by: Robert Richter <rrichter@amd.com>
Reviewed-by: skhan@linuxfoundation.org
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'tools/power/cpupower/utils/helpers/amd.c')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/amd.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c index 34368436bbd6..8b69c7ff639a 100644 --- a/tools/power/cpupower/utils/helpers/amd.c +++ b/tools/power/cpupower/utils/helpers/amd.c @@ -94,11 +94,10 @@ int decode_pstates(unsigned int cpu, unsigned int cpu_family, union core_pstate pstate; unsigned long long val; - /* Only read out frequencies from HW when CPU might be boostable - to keep the code as short and clean as possible. - Otherwise frequencies are exported via ACPI tables. - */ - if (cpu_family < 0x10 || cpu_family == 0x14) + /* Only read out frequencies from HW if HW Pstate is supported, + * otherwise frequencies are exported via ACPI tables. + */ + if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_HW_PSTATE)) return -1; if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val)) |