Messages in this thread | | | Subject | Re: [PATCH 13/19] cpupower: add the function to check amd-pstate enabled | From | Shuah Khan <> | Date | Thu, 9 Sep 2021 16:16:21 -0600 |
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On 9/8/21 8:59 AM, Huang Rui wrote: > Introduce the cpupower_amd_pstate_enabled() to check whether the kernel > mode enables amd-pstate. >
What does "kernel mode" mean? Are you referring to kernel vs. firmware mode?
> 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 >
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