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cpupower: Add the function to check AMD P-State enabled

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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>
This commit is contained in:
Huang Rui 2022-02-22 23:34:18 +08:00 committed by Shuah Khan
parent c8be60c120
commit 46c273a095
2 changed files with 28 additions and 0 deletions
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10
tools/power/cpupower/utils/helpers/helpers.h
View file

@ -11,6 +11,7 @@
#include <libintl.h>
#include <locale.h>
#include <stdbool.h>
#include "helpers/bitmask.h"
#include <cpupower.h>
@ -136,6 +137,12 @@ extern int decode_pstates(unsigned int cpu, int boost_states,
extern int cpufreq_has_boost_support(unsigned int cpu, int *support,
int *active, int * states);
/* AMD P-State stuff **************************/
bool cpupower_amd_pstate_enabled(void);
/* AMD P-State stuff **************************/
/*
* CPUID functions returning a single datum
*/
@ -168,6 +175,9 @@ static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,
int *active, int * states)
{ return -1; }
static inline bool cpupower_amd_pstate_enabled(void)
{ return false; }
/* cpuid and cpuinfo helpers **************************/
static inline unsigned int cpuid_eax(unsigned int op) { return 0; };

18
tools/power/cpupower/utils/helpers/misc.c
View file

@ -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