@@ -136,6 +136,12 @@ 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-States stuff **************************/
+extern unsigned long cpupower_amd_pstate_enabled(void);
+
+/* AMD P-States stuff **************************/
+
/*
* CPUID functions returning a single datum
*/
@@ -168,6 +174,9 @@ static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,
int *active, int * states)
{ return -1; }
+static inline unsigned long cpupower_amd_pstate_enabled(void)
+{ return 0; }
+
/* cpuid and cpuinfo helpers **************************/
static inline unsigned int cpuid_eax(unsigned int op) { return 0; };
@@ -83,6 +83,26 @@ int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val)
return 0;
}
+unsigned long cpupower_amd_pstate_enabled(void)
+{
+ char linebuf[MAX_LINE_LEN];
+ char path[SYSFS_PATH_MAX];
+ unsigned long val;
+ char *endp;
+
+ snprintf(path, sizeof(path),
+ PATH_TO_CPU "cpu0/cpufreq/is_amd_pstate_enabled");
+
+ if (cpupower_read_sysfs(path, linebuf, MAX_LINE_LEN) == 0)
+ return 0;
+
+ val = strtoul(linebuf, &endp, 0);
+ if (endp == linebuf || errno == ERANGE)
+ return 0;
+
+ return val;
+}
+
#endif /* #if defined(__i386__) || defined(__x86_64__) */
/* get_cpustate
The processor with amd-pstate function also supports legacy ACPI hardware P-States feature as well. Once driver sets amd-pstate eanbled, the processor will respond the finer grain amd-pstate feature instead of legacy ACPI P-States. So it introduces the cpupower_amd_pstate_enabled() to check whether the current kernel enables amd-pstate or acpi-cpufreq module. Signed-off-by: Huang Rui <ray.huang@amd.com> --- tools/power/cpupower/utils/helpers/helpers.h | 9 +++++++++ tools/power/cpupower/utils/helpers/misc.c | 20 ++++++++++++++++++++ 2 files changed, 29 insertions(+)