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cpupower: Add support for amd_pstate mode change
amd_pstate supports changing of its mode dynamically via `status` sysfs file. Add the same capability in cpupower. To change the mode to active mode use below command: cpupower set --amd-pstate-mode active Acked-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Wyes Karny <wyes.karny@amd.com> Tested-by: Perry Yuan <Perry.Yuan@amd.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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parent
f2ab555711
commit
df8776b036
3 changed files with 43 additions and 2 deletions
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@ -19,6 +19,7 @@
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static struct option set_opts[] = {
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{"perf-bias", required_argument, NULL, 'b'},
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{"epp", required_argument, NULL, 'e'},
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{"amd-pstate-mode", required_argument, NULL, 'm'},
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{ },
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};
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@ -39,12 +40,13 @@ int cmd_set(int argc, char **argv)
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struct {
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int perf_bias:1;
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int epp:1;
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int mode:1;
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};
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int params;
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} params;
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int perf_bias = 0;
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int ret = 0;
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char epp[30];
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char epp[30], mode[20];
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ret = uname(&uts);
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if (!ret && (!strcmp(uts.machine, "ppc64le") ||
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@ -58,7 +60,7 @@ int cmd_set(int argc, char **argv)
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params.params = 0;
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/* parameter parsing */
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while ((ret = getopt_long(argc, argv, "b:e:",
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while ((ret = getopt_long(argc, argv, "b:e:m:",
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set_opts, NULL)) != -1) {
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switch (ret) {
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case 'b':
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@ -81,6 +83,17 @@ int cmd_set(int argc, char **argv)
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}
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params.epp = 1;
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break;
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case 'm':
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if (cpupower_cpu_info.vendor != X86_VENDOR_AMD)
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print_wrong_arg_exit();
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if (params.mode)
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print_wrong_arg_exit();
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if (sscanf(optarg, "%19s", mode) != 1) {
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print_wrong_arg_exit();
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return -EINVAL;
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}
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params.mode = 1;
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break;
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default:
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print_wrong_arg_exit();
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}
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@ -89,6 +102,12 @@ int cmd_set(int argc, char **argv)
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if (!params.params)
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print_wrong_arg_exit();
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if (params.mode) {
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ret = cpupower_set_amd_pstate_mode(mode);
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if (ret)
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fprintf(stderr, "Error setting mode\n");
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}
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/* Default is: set all CPUs */
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if (bitmask_isallclear(cpus_chosen))
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bitmask_setall(cpus_chosen);
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@ -123,6 +142,7 @@ int cmd_set(int argc, char **argv)
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break;
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}
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}
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}
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return ret;
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}
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@ -117,6 +117,7 @@ extern int cpupower_intel_get_perf_bias(unsigned int cpu);
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extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
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extern int cpupower_set_epp(unsigned int cpu, char *epp);
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extern int cpupower_set_amd_pstate_mode(char *mode);
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/* Read/Write msr ****************************/
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@ -177,6 +178,8 @@ static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
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static inline int cpupower_set_epp(unsigned int cpu, char *epp)
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{ return -1; };
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static inline int cpupower_set_amd_pstate_mode(char *mode)
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{ return -1; };
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/* Read/Write msr ****************************/
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@ -106,6 +106,24 @@ int cpupower_set_epp(unsigned int cpu, char *epp)
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return 0;
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}
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int cpupower_set_amd_pstate_mode(char *mode)
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{
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char path[SYSFS_PATH_MAX];
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char linebuf[20] = {};
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snprintf(path, sizeof(path), PATH_TO_CPU "amd_pstate/status");
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if (!is_valid_path(path))
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return -1;
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snprintf(linebuf, sizeof(linebuf), "%s\n", mode);
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if (cpupower_write_sysfs(path, linebuf, 20) <= 0)
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return -1;
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return 0;
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}
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bool cpupower_amd_pstate_enabled(void)
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{
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char *driver = cpufreq_get_driver(0);
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