Date: Wed, 7 Feb 2024 13:35:17 +0000
From: "Yuan, Perry" <Perry.Yuan@....com>
To: Oleksandr Natalenko <oleksandr@...alenko.name>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>, "Limonciello,
 Mario" <Mario.Limonciello@....com>, "viresh.kumar@...aro.org"
	<viresh.kumar@...aro.org>, "Huang, Ray" <Ray.Huang@....com>, "Shenoy, Gautham
 Ranjal" <gautham.shenoy@....com>, "Petkov, Borislav"
	<Borislav.Petkov@....com>
CC: "Deucher, Alexander" <Alexander.Deucher@....com>, "Huang, Shimmer"
	<Shimmer.Huang@....com>, "Du, Xiaojian" <Xiaojian.Du@....com>, "Meng, Li
 (Jassmine)" <Li.Meng@....com>, "linux-pm@...r.kernel.org"
	<linux-pm@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 6/7] cpufreq: amd-pstate: remove legacy set_boost
 callback for passive mode

[AMD Official Use Only - General]

> -----Original Message-----
> From: Oleksandr Natalenko <oleksandr@...alenko.name>
> Sent: Wednesday, February 7, 2024 9:27 PM
> To: rafael.j.wysocki@...el.com; Limonciello, Mario
> <Mario.Limonciello@....com>; viresh.kumar@...aro.org; Huang, Ray
> <Ray.Huang@....com>; Shenoy, Gautham Ranjal
> <gautham.shenoy@....com>; Petkov, Borislav
> <Borislav.Petkov@....com>; Yuan, Perry <Perry.Yuan@....com>
> Cc: Deucher, Alexander <Alexander.Deucher@....com>; Huang, Shimmer
> <Shimmer.Huang@....com>; Du, Xiaojian <Xiaojian.Du@....com>; Meng,
> Li (Jassmine) <Li.Meng@....com>; linux-pm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH v3 6/7] cpufreq: amd-pstate: remove legacy set_boost
> callback for passive mode
>
> On středa 7. února 2024 14:17:06 CET Yuan, Perry wrote:
> > [AMD Official Use Only - General]
> >
> > Hi,
> >
> > > -----Original Message-----
> > > From: Oleksandr Natalenko <oleksandr@...alenko.name>
> > > Sent: Wednesday, February 7, 2024 6:11 PM
> > > To: rafael.j.wysocki@...el.com; Limonciello, Mario
> > > <Mario.Limonciello@....com>; viresh.kumar@...aro.org; Huang, Ray
> > > <Ray.Huang@....com>; Shenoy, Gautham Ranjal
> > > <gautham.shenoy@....com>; Petkov, Borislav
> > > <Borislav.Petkov@....com>; Yuan, Perry <Perry.Yuan@....com>
> > > Cc: Deucher, Alexander <Alexander.Deucher@....com>; Huang,
> Shimmer
> > > <Shimmer.Huang@....com>; Du, Xiaojian <Xiaojian.Du@....com>;
> Meng,
> > > Li (Jassmine) <Li.Meng@....com>; linux-pm@...r.kernel.org; linux-
> > > kernel@...r.kernel.org
> > > Subject: Re: [PATCH v3 6/7] cpufreq: amd-pstate: remove legacy
> > > set_boost callback for passive mode
> > >
> > > Hello.
> > >
> > > On středa 7. února 2024 10:21:57 CET Perry Yuan wrote:
> > > > With new freqency boost interface supported, legacy boost control
> > > > doesn't make sense any more which only support passive mode.
> > > > so it can remove the legacy set_boost interface from amd-pstate
> > > > driver in case of there is conflict with new boost control logic.
> > > >
> > > > Signed-off-by: Perry Yuan <perry.yuan@....com>
> > > > ---
> > > >  drivers/cpufreq/amd-pstate.c | 1 -
> > > >  include/linux/amd-pstate.h   | 1 -
> > > >  2 files changed, 2 deletions(-)
> > > >
> > > > diff --git a/drivers/cpufreq/amd-pstate.c
> > > > b/drivers/cpufreq/amd-pstate.c index 35791efc6e88..1dd523db3871
> > > 100644
> > > > --- a/drivers/cpufreq/amd-pstate.c
> > > > +++ b/drivers/cpufreq/amd-pstate.c
> > > > @@ -1675,7 +1675,6 @@ static struct cpufreq_driver
> > > > amd_pstate_driver =
> > > {
> > > >     .exit           = amd_pstate_cpu_exit,
> > > >     .suspend        = amd_pstate_cpu_suspend,
> > > >     .resume         = amd_pstate_cpu_resume,
> > > > -   .set_boost      = amd_pstate_set_boost,
> > > >     .update_limits  = amd_pstate_update_limits,
> > > >     .name           = "amd-pstate",
> > > >     .attr           = amd_pstate_attr,
> > > > diff --git a/include/linux/amd-pstate.h
> > > > b/include/linux/amd-pstate.h index 465e9295a60c..ab7ca26974da
> > > > 100644
> > > > --- a/include/linux/amd-pstate.h
> > > > +++ b/include/linux/amd-pstate.h
> > > > @@ -93,7 +93,6 @@ struct amd_cpudata {
> > > >     struct amd_aperf_mperf prev;
> > > >
> > > >     u64     freq;
> > > > -   bool    boost_supported;
> > >
> > > As a result of this removal the kernel-doc for this struct should be
> > > amended too because even after this patch is applied the
> > > `boost_supported` field remains documented.
> >
> > The set_boost is callback used by cpufreq.c, the boost_supported is not
> documented before the patch.
> > We just need to add new sysfs "cpb_boost" introduction in the
> "/Documentation/admin-guide/pm/amd-pstate.rst"
> > The legacy boost is not supported any more, we have no need to
> document it again as it is.
>
> `boost_supported` as a field of `struct amd_cpudata` is documented in the
> kernel-doc right before the structure, and this bit should be removed like
> shown below:

You mean the comment in the amd-pstate.h, right?
I misunderstood that you are referring to amd-pstate.rst Doc.
The comment is removed from v4, will send it out after other feedback collected.
Thanks for the review!

Perry.

- * @boost_supported: check whether the Processor or SBIOS supports
> boost mode

>
> ```
> --- a/include/linux/amd-pstate.h
> +++ b/include/linux/amd-pstate.h
> @@ -56,7 +56,6 @@ struct amd_aperf_mperf {
>   * @cur: Difference of Aperf/Mperf/tsc count between last and current
> sample
>   * @prev: Last Aperf/Mperf/tsc count value read from register
>   * @freq: current cpu frequency value
> - * @boost_supported: check whether the Processor or SBIOS supports
> boost mode
>   * @hw_prefcore: check whether HW supports preferred core featue.
>   *             Only when hw_prefcore and early prefcore param are true,
>   *             AMD P-State driver supports preferred core featue.
>
> ```
>
> > Perry.
> >
> > >
> > > >     bool    hw_prefcore;
> > > >
> > > >     /* EPP feature related attributes*/
> > > >
> > >
> > >
> > > --
> > > Oleksandr Natalenko (post-factum)
> >
>
>
> --
> Oleksandr Natalenko (post-factum)

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