Commit 46c273a0 authored by Huang Rui's avatar Huang Rui Committed by Shuah Khan
Browse files

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: default avatarShuah Khan <skhan@linuxfoundation.org>
Signed-off-by: default avatarHuang Rui <ray.huang@amd.com>
Signed-off-by: default avatarShuah Khan <skhan@linuxfoundation.org>
parent c8be60c1

tools/power/cpupower/utils/helpers/helpers.h

+10 −0
Original line number Diff line number Diff line
@@ -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; };

tools/power/cpupower/utils/helpers/misc.c

+18 −0
Original line number Diff line number Diff line
@@ -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