[PATCH v2 14/21] cpupower: add the function to check amd-pstate enabled
From: Huang Rui <ray.huang@amd.com>
Date: 2021-09-26 09:07:32
Also in:
lkml
Subsystem:
cpu power monitoring subsystem, the rest · Maintainers:
Thomas Renninger, Shuah Khan, John B. Wyatt IV, John Kacur, Linus Torvalds
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(+)
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index b4813efdfb00..ae96efac759f 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h@@ -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; };
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index fc6e34511721..39ff154ea9cf 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(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
--
2.25.1