From: Huang Rui <ray.huang@amd.com>
To: Shuah Khan <skhan@linuxfoundation.org>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Borislav Petkov <bp@suse.de>, Ingo Molnar <mingo@kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"Sharma, Deepak" <Deepak.Sharma@amd.com>,
"Deucher, Alexander" <Alexander.Deucher@amd.com>,
"Limonciello, Mario" <Mario.Limonciello@amd.com>,
"Fontenot, Nathan" <Nathan.Fontenot@amd.com>,
"Su, Jinzhou (Joe)" <Jinzhou.Su@amd.com>,
"Du, Xiaojian" <Xiaojian.Du@amd.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH 13/19] cpupower: add the function to check amd-pstate enabled
Date: Mon, 13 Sep 2021 19:29:45 +0800 [thread overview]
Message-ID: <20210913112945.GE3731830@hr-amd> (raw)
In-Reply-To: <50412248-179d-3548-aeb0-d912a14a152f@linuxfoundation.org>
On Fri, Sep 10, 2021 at 06:16:21AM +0800, Shuah Khan wrote:
> 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?
I am referring kernel. In fact, the proccessor which supports the AMD
P-States also supports the legacy ACPI P-States as well. So this API is to
check whether the kernel driver is using amd-pstate or acpi-cpufreq.
I would have explained this, sorry to make you confused, I will explain the
details in the commit log at V2.
Thanks,
Ray
>
> > 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
> >
>
next prev parent reply other threads:[~2021-09-13 11:30 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-08 14:59 [PATCH 00/19] cpufreq: introduce a new AMD CPU frequency control mechanism Huang Rui
2021-09-08 14:59 ` [PATCH 01/19] x86/cpufreatures: add AMD CPPC extension feature flag Huang Rui
2021-09-08 20:00 ` Shuah Khan
2021-09-09 9:45 ` Huang Rui
2021-09-09 17:58 ` Borislav Petkov
2021-09-13 9:48 ` Huang Rui
2021-09-13 13:04 ` Borislav Petkov
2021-09-16 9:30 ` Huang Rui
2021-09-08 14:59 ` [PATCH 02/19] x86/msr: add AMD CPPC MSR definitions Huang Rui
2021-09-08 14:59 ` [PATCH 03/19] ACPI: CPPC: add cppc enable register function Huang Rui
2021-09-08 19:14 ` Fontenot, Nathan
2021-09-09 9:50 ` Huang Rui
2021-09-09 0:21 ` Shuah Khan
2021-09-09 9:58 ` Huang Rui
2021-09-08 14:59 ` [PATCH 04/19] cpufreq: amd: introduce a new amd pstate driver to support future processors Huang Rui
2021-09-09 15:01 ` Peter Zijlstra
2021-09-13 8:11 ` Huang Rui
2021-09-13 8:56 ` Peter Zijlstra
2021-09-13 10:54 ` Huang Rui
2021-09-13 11:56 ` Peter Zijlstra
2021-09-16 10:09 ` Huang Rui
2021-09-16 11:19 ` Rafael J. Wysocki
2021-09-17 3:41 ` Huang Rui
2021-09-09 15:03 ` Peter Zijlstra
2021-09-13 11:55 ` Huang Rui
2021-09-09 19:31 ` Fontenot, Nathan
2021-09-13 11:18 ` Huang Rui
2021-09-08 14:59 ` [PATCH 05/19] cpufreq: amd: add fast switch function for amd-pstate module Huang Rui
2021-09-08 14:59 ` [PATCH 06/19] cpufreq: amd: add acpi cppc function as the backend for legacy processors Huang Rui
2021-09-08 14:59 ` [PATCH 07/19] cpufreq: amd: add trace for amd-pstate module Huang Rui
2021-09-08 14:59 ` [PATCH 08/19] cpufreq: amd: add boost mode support for amd-pstate Huang Rui
2021-09-08 18:24 ` Fontenot, Nathan
2021-09-09 10:12 ` Huang Rui
2021-09-08 14:59 ` [PATCH 09/19] cpufreq: amd: add amd-pstate checking support check attribute Huang Rui
2021-09-08 14:59 ` [PATCH 10/19] cpufreq: amd: add amd-pstate frequencies attributes Huang Rui
2021-09-08 18:13 ` Fontenot, Nathan
2021-09-08 14:59 ` [PATCH 11/19] cpufreq: amd: add amd-pstate performance attributes Huang Rui
2021-09-08 18:20 ` Fontenot, Nathan
2021-09-08 14:59 ` [PATCH 12/19] cpupower: add AMD P-state capability flag Huang Rui
2021-09-08 14:59 ` [PATCH 13/19] cpupower: add the function to check amd-pstate enabled Huang Rui
2021-09-09 22:16 ` Shuah Khan
2021-09-13 11:29 ` Huang Rui [this message]
2021-09-08 14:59 ` [PATCH 14/19] cpupower: initial AMD P-state capability Huang Rui
2021-09-09 22:16 ` Shuah Khan
2021-09-13 12:58 ` Huang Rui
2021-09-08 14:59 ` [PATCH 15/19] cpupower: add amd-pstate sysfs entries into libcpufreq Huang Rui
2021-09-09 22:26 ` Shuah Khan
2021-09-16 8:47 ` Huang Rui
2021-09-08 14:59 ` [PATCH 16/19] cpupower: enable boost state support for amd-pstate module Huang Rui
2021-09-08 17:32 ` Fontenot, Nathan
2021-09-09 9:59 ` Huang Rui
2021-09-09 22:42 ` Shuah Khan
2021-09-16 9:27 ` Huang Rui
2021-09-08 14:59 ` [PATCH 17/19] cpupower: add amd-pstate get data function to query the info Huang Rui
2021-09-09 22:45 ` Shuah Khan
2021-09-08 15:00 ` [PATCH 18/19] cpupower: print amd-pstate information on cpupower Huang Rui
2021-09-09 22:46 ` Shuah Khan
2021-09-16 9:29 ` Huang Rui
2021-09-08 15:00 ` [PATCH 19/19] Documentation: amd-pstate: add amd-pstate driver introduction Huang Rui
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