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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 14/19] cpupower: initial AMD P-state capability
Date: Mon, 13 Sep 2021 20:58:23 +0800	[thread overview]
Message-ID: <20210913125823.GF3731830@hr-amd> (raw)
In-Reply-To: <b030e734-e294-9bf5-ce88-a9e2970da0ef@linuxfoundation.org>

On Fri, Sep 10, 2021 at 06:16:50AM +0800, Shuah Khan wrote:
> On 9/8/21 8:59 AM, Huang Rui wrote:
> > If kernel enables AMD P-state, cpupower won't need to respond ACPI
> > hardware P-states function anymore.
> > 
> 
> This commit log doesn't seem to match the code change. I see it
> calling cpupower_amd_pstate_enabled() and setting flags.

Hmm, yes, I should reword this as well. If the kernel uses the amd-pstate
module, we only need CPUPOWER_CAP_AMD_PSTATE flag, and disable the legacy
acpi-cpufreq relative flags.

> 
> > Signed-off-by: Huang Rui <ray.huang@amd.com>
> > ---
> >   tools/power/cpupower/utils/helpers/cpuid.c | 13 +++++++++++++
> >   1 file changed, 13 insertions(+)
> > 
> > diff --git a/tools/power/cpupower/utils/helpers/cpuid.c b/tools/power/cpupower/utils/helpers/cpuid.c
> > index 72eb43593180..78218c54acca 100644
> > --- a/tools/power/cpupower/utils/helpers/cpuid.c
> > +++ b/tools/power/cpupower/utils/helpers/cpuid.c
> > @@ -149,6 +149,19 @@ int get_cpu_info(struct cpupower_cpu_info *cpu_info)
> >   		if (ext_cpuid_level >= 0x80000008 &&
> >   		    cpuid_ebx(0x80000008) & (1 << 4))
> >   			cpu_info->caps |= CPUPOWER_CAP_AMD_RDPRU;
> > +
> > +		if (cpupower_amd_pstate_enabled(0)) {
> 
> What is the reason for calling this function with cpu id = 0?

No specific reason, actually, any cpu id should be ok here.

Thanks,
Ray

> 
> 
> > +			cpu_info->caps |= CPUPOWER_CAP_AMD_PSTATE;
> > +
> > +			/*
> > +			 * If AMD P-state is enabled, the firmware will treat
> > +			 * AMD P-state function as high priority.
> > +			 */
> > +			cpu_info->caps &= ~CPUPOWER_CAP_AMD_CPB;
> > +			cpu_info->caps &= ~CPUPOWER_CAP_AMD_CPB_MSR;
> > +			cpu_info->caps &= ~CPUPOWER_CAP_AMD_HW_PSTATE;
> > +			cpu_info->caps &= ~CPUPOWER_CAP_AMD_PSTATEDEF;
> > +		}
> >   	}
> >   
> >   	if (cpu_info->vendor == X86_VENDOR_INTEL) {
> > 
> 
> thanks,
> -- Shuah

  reply	other threads:[~2021-09-13 12:58 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
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 [this message]
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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