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Date: Tue, 20 Jun 2023 18:50:52 +0530
From: Wyes Karny <wyes.karny@....com>
To: Huang Rui <ray.huang@....com>
Cc: "rafael@...nel.org" <rafael@...nel.org>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
"trenn@...e.com" <trenn@...e.com>,
"shuah@...nel.org" <shuah@...nel.org>,
"Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
"Limonciello, Mario" <Mario.Limonciello@....com>,
"Yuan, Perry" <Perry.Yuan@....com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] cpupower: Add EPP value change support
Hi Ray,
On 20 Jun 20:58, Huang Rui wrote:
> On Fri, Jun 16, 2023 at 05:03:46PM +0800, Karny, Wyes wrote:
> > Hi Ray,
> >
> > On 16 Jun 15:22, Huang Rui wrote:
> > > On Mon, Jun 12, 2023 at 07:36:13PM +0800, Karny, Wyes wrote:
> > > > amd_pstate and intel_pstate active mode drivers support energy
> > > > performance preference feature. Through this user can convey it's
> > > > energy/performance preference to platform. Add this value change
> > > > capability to cpupower.
> > > >
> > > > To change the EPP value use below command:
> > > > cpupower set --epp performance
> > > >
> > > > Signed-off-by: Wyes Karny <wyes.karny@....com>
> > > > ---
> > > > tools/power/cpupower/utils/cpupower-set.c | 23 +++++++++++++++++++-
> > > > tools/power/cpupower/utils/helpers/helpers.h | 5 +++++
> > > > tools/power/cpupower/utils/helpers/misc.c | 19 ++++++++++++++++
> > > > 3 files changed, 46 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c
> > > > index 180d5ba877e6..a789b123dbd4 100644
> > > > --- a/tools/power/cpupower/utils/cpupower-set.c
> > > > +++ b/tools/power/cpupower/utils/cpupower-set.c
> > > > @@ -18,6 +18,7 @@
> > > >
> > > > static struct option set_opts[] = {
> > > > {"perf-bias", required_argument, NULL, 'b'},
> > > > + {"epp", required_argument, NULL, 'e'},
> > >
> > > How about re-using the "perf-bias", I think it should be the simliar
> > > function with Intel's processor?
> >
> > AFAIU 'perf-bias' is not same as 'epp'. Perf-bias sysfs file expects
> > 0-15 integer value, whereas epp sysfs file expects one of the string
> > form energy_performance_available_preferences file.
>
> I am thinking whether we can have a unify energy performance preferences
> input in cpupower for both intel and amd processors. But it seems not easy
> to align with them because different hardware interfaces here.
It will work for intel_pstate as well. Perf_bias is differnet interface
for some intel processors IIUC.
Thanks,
Wyes
> Anyway, it's not a big problem. Path looks good for me.
>
> Thanks,
> Ray
>
> >
> > Thanks,
> > Wyes
> > >
> > > Thanks,
> > > Ray
> > >
> > > > { },
> > > > };
> > > >
> > > > @@ -37,11 +38,13 @@ int cmd_set(int argc, char **argv)
> > > > union {
> > > > struct {
> > > > int perf_bias:1;
> > > > + int epp:1;
> > > > };
> > > > int params;
> > > > } params;
> > > > int perf_bias = 0;
> > > > int ret = 0;
> > > > + char epp[30];
> > > >
> > > > ret = uname(&uts);
> > > > if (!ret && (!strcmp(uts.machine, "ppc64le") ||
> > > > @@ -55,7 +58,7 @@ int cmd_set(int argc, char **argv)
> > > >
> > > > params.params = 0;
> > > > /* parameter parsing */
> > > > - while ((ret = getopt_long(argc, argv, "b:",
> > > > + while ((ret = getopt_long(argc, argv, "b:e:",
> > > > set_opts, NULL)) != -1) {
> > > > switch (ret) {
> > > > case 'b':
> > > > @@ -69,6 +72,15 @@ int cmd_set(int argc, char **argv)
> > > > }
> > > > params.perf_bias = 1;
> > > > break;
> > > > + case 'e':
> > > > + if (params.epp)
> > > > + print_wrong_arg_exit();
> > > > + if (sscanf(optarg, "%29s", epp) != 1) {
> > > > + print_wrong_arg_exit();
> > > > + return -EINVAL;
> > > > + }
> > > > + params.epp = 1;
> > > > + break;
> > > > default:
> > > > print_wrong_arg_exit();
> > > > }
> > > > @@ -102,6 +114,15 @@ int cmd_set(int argc, char **argv)
> > > > break;
> > > > }
> > > > }
> > > > +
> > > > + if (params.epp) {
> > > > + ret = cpupower_set_epp(cpu, epp);
> > > > + if (ret) {
> > > > + fprintf(stderr,
> > > > + "Error setting epp value on CPU %d\n", cpu);
> > > > + break;
> > > > + }
> > > > + }
> > > > }
> > > > return ret;
> > > > }
> > > > diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
> > > > index 96e4bede078b..5d998de2d291 100644
> > > > --- a/tools/power/cpupower/utils/helpers/helpers.h
> > > > +++ b/tools/power/cpupower/utils/helpers/helpers.h
> > > > @@ -116,6 +116,8 @@ extern int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val);
> > > > extern int cpupower_intel_get_perf_bias(unsigned int cpu);
> > > > extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
> > > >
> > > > +extern int cpupower_set_epp(unsigned int cpu, char *epp);
> > > > +
> > > > /* Read/Write msr ****************************/
> > > >
> > > > /* PCI stuff ****************************/
> > > > @@ -173,6 +175,9 @@ static inline int cpupower_intel_get_perf_bias(unsigned int cpu)
> > > > static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
> > > > { return 0; };
> > > >
> > > > +static inline int cpupower_set_epp(unsigned int cpu, char *epp)
> > > > +{ return -1; };
> > > > +
> > > > /* Read/Write msr ****************************/
> > > >
> > > > static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,
> > > > diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
> > > > index 21f653cd472c..63c3f26ef874 100644
> > > > --- a/tools/power/cpupower/utils/helpers/misc.c
> > > > +++ b/tools/power/cpupower/utils/helpers/misc.c
> > > > @@ -87,6 +87,25 @@ int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val)
> > > > return 0;
> > > > }
> > > >
> > > > +int cpupower_set_epp(unsigned int cpu, char *epp)
> > > > +{
> > > > + char path[SYSFS_PATH_MAX];
> > > > + char linebuf[30] = {};
> > > > +
> > > > + snprintf(path, sizeof(path),
> > > > + PATH_TO_CPU "cpu%u/cpufreq/energy_performance_preference", cpu);
> > > > +
> > > > + if (!is_valid_path(path))
> > > > + return -1;
> > > > +
> > > > + snprintf(linebuf, sizeof(linebuf), "%s", epp);
> > > > +
> > > > + if (cpupower_write_sysfs(path, linebuf, 30) <= 0)
> > > > + return -1;
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > bool cpupower_amd_pstate_enabled(void)
> > > > {
> > > > char *driver = cpufreq_get_driver(0);
> > > > --
> > > > 2.34.1
> > > >
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