[PATCH 13/19] cpupower: add the function to check amd-pstate enabled

Huang Rui
2021-09-08T15:01:46Z

Introduce the cpupower_amd_pstate_enabled() to check whether the kernel
mode enables amd-pstate.

Signed-off-by: Huang Rui <ray.huang@amd.com>
---
tools/power/cpupower/utils/helpers/helpers.h | 5 +++++
tools/power/cpupower/utils/helpers/misc.c | 20 ++++++++++++++++++++
2 files changed, 25 insertions(+)

diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index b4813efdfb00..eb43c14d1728 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h
@@ -136,6 +136,11 @@ 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 PSTATE enabling **************************/
+
+extern unsigned long cpupower_amd_pstate_enabled(unsigned int cpu);
+
/*
* CPUID functions returning a single datum
*/
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index fc6e34511721..07d80775fb68 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -83,6 +83,26 @@ int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val)
return 0;
}

+unsigned long cpupower_amd_pstate_enabled(unsigned int cpu)
+{
+ char linebuf[MAX_LINE_LEN];
+ char path[SYSFS_PATH_MAX];
+ unsigned long val;
+ char *endp;
+
+ snprintf(path, sizeof(path),
+ PATH_TO_CPU "cpu%u/cpufreq/is_amd_pstate_enabled", cpu);
+
+ 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
--
2.25.1