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| author |   Huang Rui <ray.huang@amd.com> | 2022-02-22 23:34:18 +0800 |
|---|---|---|
| committer |   Shuah Khan <skhan@linuxfoundation.org> | 2022-02-22 18:36:32 -0700 |
| commit | 46c273a0958274f1e1e69f3540ae827a92e0660f (patch) | |
| tree | 47dfc4b60693250f3330a02e402ed4882df21648 /tools/power/cpupower/utils/helpers/misc.c | |
| parent | cpupower: Add AMD P-State capability flag (diff) | |
| download | linux-dev-46c273a0958274f1e1e69f3540ae827a92e0660f.tar.xz linux-dev-46c273a0958274f1e1e69f3540ae827a92e0660f.zip | |
cpupower: Add the function to check AMD P-State enabled
The processor with AMD P-State function also supports legacy ACPI
hardware P-States feature as well. Once driver sets AMD P-State eanbled,
the processor will respond the finer grain AMD P-State feature instead of
legacy ACPI P-States. So it introduces the cpupower_amd_pstate_enabled()
to check whether the current kernel enables AMD P-State or AMD CPUFreq
module.
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to '')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/misc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c index fc6e34511721..0c483cdefcc2 100644 --- a/tools/power/cpupower/utils/helpers/misc.c +++ b/tools/power/cpupower/utils/helpers/misc.c @@ -3,9 +3,11 @@ #include <stdio.h> #include <errno.h> #include <stdlib.h> +#include <string.h> #include "helpers/helpers.h" #include "helpers/sysfs.h" +#include "cpufreq.h" #if defined(__i386__) || defined(__x86_64__) @@ -83,6 +85,22 @@ int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val) return 0; } +bool cpupower_amd_pstate_enabled(void) +{ + char *driver = cpufreq_get_driver(0); + bool ret = false; + + if (!driver) + return ret; + + if (!strcmp(driver, "amd-pstate")) + ret = true; + + cpufreq_put_driver(driver); + + return ret; +} + #endif /* #if defined(__i386__) || defined(__x86_64__) */ /* get_cpustate |