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Date: Tue, 28 May 2024 22:00:40 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Mario Limonciello <mario.limonciello@....com>, Arnd Bergmann <arnd@...nel.org>
Cc: Huang Rui <ray.huang@....com>, "Gautham R. Shenoy" <gautham.shenoy@....com>,
"Rafael J. Wysocki" <rafael@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>,
Perry Yuan <perry.yuan@....com>, Wyes Karny <wyes.karny@....com>, Arnd Bergmann <arnd@...db.de>,
Meng Li <li.meng@....com>, Swapnil Sapkal <swapnil.sapkal@....com>, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH] cpufreq: amd-pstate: remove global header file
On Tue, May 28, 2024 at 7:49 PM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> On 5/28/2024 07:09, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > When extra warnings are enabled, gcc points out a global variable
> > definition in a header:
> >
> > In file included from drivers/cpufreq/amd-pstate-ut.c:29:
> > include/linux/amd-pstate.h:123:27: error: 'amd_pstate_mode_string' defined but not used [-Werror=unused-const-variable=]
> > 123 | static const char * const amd_pstate_mode_string[] = {
> > | ^~~~~~~~~~~~~~~~~~~~~~
> >
> > This header is only included from two files in the same directory,
> > and one of them uses only a single definition from it, so clean it
> > up by moving most of the contents into the driver that uses them,
> > and making shared bits a local header file.
> >
> > Fixes: 36c5014e5460 ("cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param()")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Thanks!
>
> Acked-by: Mario Limonciello <mario.limonciello@....com>
Applied as 6.10-rc material, thanks!
> > ---
> > MAINTAINERS | 1 -
> > drivers/cpufreq/amd-pstate-ut.c | 3 +-
> > drivers/cpufreq/amd-pstate.c | 34 ++++++++++++++++++-
> > .../linux => drivers/cpufreq}/amd-pstate.h | 33 ------------------
> > 4 files changed, 35 insertions(+), 36 deletions(-)
> > rename {include/linux => drivers/cpufreq}/amd-pstate.h (82%)
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 070a39b2b098..35a75ab8ef05 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -1107,7 +1107,6 @@ L: linux-pm@...r.kernel.org
> > S: Supported
> > F: Documentation/admin-guide/pm/amd-pstate.rst
> > F: drivers/cpufreq/amd-pstate*
> > -F: include/linux/amd-pstate.h
> > F: tools/power/x86/amd_pstate_tracer/amd_pstate_trace.py
> >
> > AMD PTDMA DRIVER
> > diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c
> > index f04ae67dda37..fc275d41d51e 100644
> > --- a/drivers/cpufreq/amd-pstate-ut.c
> > +++ b/drivers/cpufreq/amd-pstate-ut.c
> > @@ -26,10 +26,11 @@
> > #include <linux/module.h>
> > #include <linux/moduleparam.h>
> > #include <linux/fs.h>
> > -#include <linux/amd-pstate.h>
> >
> > #include <acpi/cppc_acpi.h>
> >
> > +#include "amd-pstate.h"
> > +
> > /*
> > * Abbreviations:
> > * amd_pstate_ut: used as a shortform for AMD P-State unit test.
> > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> > index 1b7e82a0ad2e..91993647e09e 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -36,7 +36,6 @@
> > #include <linux/delay.h>
> > #include <linux/uaccess.h>
> > #include <linux/static_call.h>
> > -#include <linux/amd-pstate.h>
> > #include <linux/topology.h>
> >
> > #include <acpi/processor.h>
> > @@ -46,6 +45,8 @@
> > #include <asm/processor.h>
> > #include <asm/cpufeature.h>
> > #include <asm/cpu_device_id.h>
> > +
> > +#include "amd-pstate.h"
> > #include "amd-pstate-trace.h"
> >
> > #define AMD_PSTATE_TRANSITION_LATENCY 20000
> > @@ -53,6 +54,37 @@
> > #define CPPC_HIGHEST_PERF_PERFORMANCE 196
> > #define CPPC_HIGHEST_PERF_DEFAULT 166
> >
> > +#define AMD_CPPC_EPP_PERFORMANCE 0x00
> > +#define AMD_CPPC_EPP_BALANCE_PERFORMANCE 0x80
> > +#define AMD_CPPC_EPP_BALANCE_POWERSAVE 0xBF
> > +#define AMD_CPPC_EPP_POWERSAVE 0xFF
> > +
> > +/*
> > + * enum amd_pstate_mode - driver working mode of amd pstate
> > + */
> > +enum amd_pstate_mode {
> > + AMD_PSTATE_UNDEFINED = 0,
> > + AMD_PSTATE_DISABLE,
> > + AMD_PSTATE_PASSIVE,
> > + AMD_PSTATE_ACTIVE,
> > + AMD_PSTATE_GUIDED,
> > + AMD_PSTATE_MAX,
> > +};
> > +
> > +static const char * const amd_pstate_mode_string[] = {
> > + [AMD_PSTATE_UNDEFINED] = "undefined",
> > + [AMD_PSTATE_DISABLE] = "disable",
> > + [AMD_PSTATE_PASSIVE] = "passive",
> > + [AMD_PSTATE_ACTIVE] = "active",
> > + [AMD_PSTATE_GUIDED] = "guided",
> > + NULL,
> > +};
> > +
> > +struct quirk_entry {
> > + u32 nominal_freq;
> > + u32 lowest_freq;
> > +};
> > +
> > /*
> > * TODO: We need more time to fine tune processors with shared memory solution
> > * with community together.
> > diff --git a/include/linux/amd-pstate.h b/drivers/cpufreq/amd-pstate.h
> > similarity index 82%
> > rename from include/linux/amd-pstate.h
> > rename to drivers/cpufreq/amd-pstate.h
> > index d58fc022ec46..e6a28e7f4dbf 100644
> > --- a/include/linux/amd-pstate.h
> > +++ b/drivers/cpufreq/amd-pstate.h
> > @@ -1,7 +1,5 @@
> > /* SPDX-License-Identifier: GPL-2.0-only */
> > /*
> > - * linux/include/linux/amd-pstate.h
> > - *
> > * Copyright (C) 2022 Advanced Micro Devices, Inc.
> > *
> > * Author: Meng Li <li.meng@....com>
> > @@ -12,11 +10,6 @@
> >
> > #include <linux/pm_qos.h>
> >
> > -#define AMD_CPPC_EPP_PERFORMANCE 0x00
> > -#define AMD_CPPC_EPP_BALANCE_PERFORMANCE 0x80
> > -#define AMD_CPPC_EPP_BALANCE_POWERSAVE 0xBF
> > -#define AMD_CPPC_EPP_POWERSAVE 0xFF
> > -
> > /*********************************************************************
> > * AMD P-state INTERFACE *
> > *********************************************************************/
> > @@ -108,30 +101,4 @@ struct amd_cpudata {
> > bool suspended;
> > };
> >
> > -/*
> > - * enum amd_pstate_mode - driver working mode of amd pstate
> > - */
> > -enum amd_pstate_mode {
> > - AMD_PSTATE_UNDEFINED = 0,
> > - AMD_PSTATE_DISABLE,
> > - AMD_PSTATE_PASSIVE,
> > - AMD_PSTATE_ACTIVE,
> > - AMD_PSTATE_GUIDED,
> > - AMD_PSTATE_MAX,
> > -};
> > -
> > -static const char * const amd_pstate_mode_string[] = {
> > - [AMD_PSTATE_UNDEFINED] = "undefined",
> > - [AMD_PSTATE_DISABLE] = "disable",
> > - [AMD_PSTATE_PASSIVE] = "passive",
> > - [AMD_PSTATE_ACTIVE] = "active",
> > - [AMD_PSTATE_GUIDED] = "guided",
> > - NULL,
> > -};
> > -
> > -struct quirk_entry {
> > - u32 nominal_freq;
> > - u32 lowest_freq;
> > -};
> > -
> > #endif /* _LINUX_AMD_PSTATE_H */
>
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