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Message-ID: <21068e37-38fb-478c-8ec1-e41b0cd450e2@amd.com>
Date: Tue, 30 Apr 2024 11:32:12 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: "Yuan, Perry" <Perry.Yuan@....com>, "Rafael J. Wysocki"
<rafael@...nel.org>, "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>
Cc: "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
"Petkov, Borislav" <Borislav.Petkov@....com>, "Huang, Ray"
<Ray.Huang@....com>, "Deucher, Alexander" <Alexander.Deucher@....com>,
"Huang, Shimmer" <Shimmer.Huang@....com>,
"oleksandr@...alenko.name" <oleksandr@...alenko.name>,
"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 v12 0/8] AMD Pstate Fixes And Enhancements
On 4/30/2024 02:55, Yuan, Perry wrote:
> [AMD Official Use Only - General]
>
> Hi Rafael,
>
>> -----Original Message-----
>> From: Rafael J. Wysocki <rafael@...nel.org>
>> Sent: Tuesday, April 30, 2024 1:05 AM
>> To: Yuan, Perry <Perry.Yuan@....com>
>> Cc: Rafael J. Wysocki <rafael@...nel.org>; rafael.j.wysocki@...el.com;
>> Limonciello, Mario <Mario.Limonciello@....com>; viresh.kumar@...aro.org;
>> Shenoy, Gautham Ranjal <gautham.shenoy@....com>; Petkov, Borislav
>> <Borislav.Petkov@....com>; Huang, Ray <Ray.Huang@....com>; Deucher,
>> Alexander <Alexander.Deucher@....com>; Huang, Shimmer
>> <Shimmer.Huang@....com>; oleksandr@...alenko.name; Du, Xiaojian
>> <Xiaojian.Du@....com>; Meng, Li (Jassmine) <Li.Meng@....com>; linux-
>> pm@...r.kernel.org; linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH v12 0/8] AMD Pstate Fixes And Enhancements
>>
>> On Mon, Apr 29, 2024 at 4:56 AM Yuan, Perry <Perry.Yuan@....com>
>> wrote:
>>>
>>> [AMD Official Use Only - General]
>>>
>>> Hi Rafael,
>>>
>>>
>>>> -----Original Message-----
>>>> From: Rafael J. Wysocki <rafael@...nel.org>
>>>> Sent: Saturday, April 27, 2024 1:38 AM
>>>> To: Yuan, Perry <Perry.Yuan@....com>
>>>> Cc: rafael.j.wysocki@...el.com; Limonciello, Mario
>>>> <Mario.Limonciello@....com>; viresh.kumar@...aro.org; Shenoy,
>>>> Gautham Ranjal <gautham.shenoy@....com>; Petkov, Borislav
>>>> <Borislav.Petkov@....com>; Huang, Ray <Ray.Huang@....com>;
>> Deucher,
>>>> Alexander <Alexander.Deucher@....com>; Huang, Shimmer
>>>> <Shimmer.Huang@....com>; oleksandr@...alenko.name; Du, Xiaojian
>>>> <Xiaojian.Du@....com>; Meng, Li (Jassmine) <Li.Meng@....com>;
>> linux-
>>>> pm@...r.kernel.org; linux-kernel@...r.kernel.org
>>>> Subject: Re: [PATCH v12 0/8] AMD Pstate Fixes And Enhancements
>>>>
>>>> On Thu, Apr 25, 2024 at 10:08 AM Perry Yuan <perry.yuan@....com>
>>>> wrote:
>>>>>
>>>>> The patch series adds some fixes and enhancements to the AMD
>>>>> pstate driver.
>>>>>
>>>>> It enables CPPC v2 for certain processors in the family 17H, as
>>>>> requested by TR40 processor users who expect improved performance
>>>>> and lower system temperature.
>>>>>
>>>>> changes latency and delay values to be read from platform firmware
>>>>> firstly for more accurate timing.
>>>>>
>>>>> A new quirk is introduced for supporting amd-pstate on legacy
>>>>> processors which either lack CPPC capability, or only only have
>>>>> CPPC
>>>>> v2 capability
>>>>>
>>>>> Testing done with one APU system while cpb boost on:
>>>>>
>>>>> amd_pstate_lowest_nonlinear_freq:1701000
>>>>> amd_pstate_max_freq:3501000
>>>>> cpuinfo_max_freq:3501000
>>>>> cpuinfo_min_freq:400000
>>>>> scaling_cur_freq:3084836
>>>>> scaling_max_freq:3501000
>>>>> scaling_min_freq:400000
>>>>>
>>>>> analyzing CPU 6:
>>>>> driver: amd-pstate-epp
>>>>> CPUs which run at the same hardware frequency: 6
>>>>> CPUs which need to have their frequency coordinated by software: 6
>>>>> maximum transition latency: Cannot determine or is not supported.
>>>>> hardware limits: 400 MHz - 3.50 GHz
>>>>> available cpufreq governors: performance powersave
>>>>> current policy: frequency should be within 400 MHz and 3.50 GHz.
>>>>> The governor "powersave" may decide which speed to use
>>>>> within this range.
>>>>> current CPU frequency: Unable to call hardware
>>>>> current CPU frequency: 3.50 GHz (asserted by call to kernel)
>>>>> boost state support:
>>>>> Supported: yes
>>>>> Active: yes
>>>>> AMD PSTATE Highest Performance: 255. Maximum Frequency: 3.50
>> GHz.
>>>>> AMD PSTATE Nominal Performance: 204. Nominal Frequency: 2.80
>> GHz.
>>>>> AMD PSTATE Lowest Non-linear Performance: 124. Lowest
>>>>> Non-linear
>>>> Frequency: 1.70 GHz.
>>>>> AMD PSTATE Lowest Performance: 30. Lowest Frequency: 400 MHz.
>>>>>
>>>>>
>>>>> I would greatly appreciate any feedbacks.
>>>>> Thank you!
>>>>> Perry.
>>>>>
>>>>> Changes from v11:
>>>>> * minmor change for patch 1 "perf" change to "performance"(Huang
>>>>> ray)
>>>>> * rebased to lastest linux-pm/bleeding-edge branch
>>>>>
>>>>> Changes from v10:
>>>>> * pick ack-by flags from huang ray for all patches.
>>>>> * run testing on AMD Ryzen 5 7640U without regression issue.
>>>>>
>>>>> Changes from v9:
>>>>> * pick review by flag from Meng Li
>>>>> * pick test by flag from Ugwekar Dhananjay
>>>>> * picl review by flag from Gautham R. Shenoy
>>>>>
>>>>> Changes from v8:
>>>>> * add commit log for patch 1 and patch 2 (Rafael)
>>>>> * add missing Perry signed-off-by for new patches #1,#2,#4
>>>>> (Rafael)
>>>>> * rebased to latest linux-pm/bleeding-edge
>>>>>
>>>>> Changes from v7:
>>>>> * Gautham helped to invole some new improved patches into the
>> patchset.
>>>>> * Adds comments for cpudata->{min,max}_limit_{perf,freq},
>>>>> variables [New
>>>> Patch].
>>>>> * Clarifies that the units for cpudata->*_freq is in khz via
>>>>> comments [New
>>>> Patch].
>>>>> * Implements the unified computation of all cpudata->*_freq
>>>>> * v7 Patch 2/6 was dropped which is not needed any more
>>>>> * moved the quirk check to the amd_pstate_get_freq() function
>>>>> * pick up RB flags from Gautham
>>>>> * After the cleanup in patch 3, we don't need the helpers
>>>>> amd_get_{min,max,nominal,lowest_nonlinear}_freq(). This
>>>>> patch removes it [New Patch].
>>>>> * testing done on APU system as well, no regression found.
>>>>>
>>>>> Changes from v6:
>>>>> * add one new patch to initialize capabilities in
>>>>> amd_pstate_init_perf which can avoid duplicate cppc capabilities read
>>>>> the change has been tested on APU system.
>>>>> * pick up RB flags from Gautham
>>>>> * drop the patch 1/6 which has been merged by Rafael
>>>>>
>>>>> Changes from v5:
>>>>> * rebased to linux-pm v6.8
>>>>> * pick up RB flag from for patch 6(Mario)
>>>>>
>>>>> Changes from v4:
>>>>> * improve the dmi matching rule with zen2 flag only
>>>>>
>>>>> Changes from v3:
>>>>> * change quirk matching broken BIOS with family/model ID and Zen2
>>>>> flag to fix the CPPC definition issue
>>>>> * fix typo in quirk
>>>>>
>>>>> Changes from v2:
>>>>> * change quirk matching to BIOS version and release (Mario)
>>>>> * pick up RB flag from Mario
>>>>>
>>>>> Changes from v1:
>>>>> * pick up the RB flags from Mario
>>>>> * address review comment of patch #6 for amd_get_nominal_freq()
>>>>> * rebased the series to linux-pm/bleeding-edge v6.8.0-rc2
>>>>> * update debug log for patch #5 as Mario suggested.
>>>>> * fix some typos and format problems
>>>>> * tested on 7950X platform
>>>>>
>>>>>
>>>>> V1:
>>>>> https://lore.kernel.org/lkml/63c2b3d7-083a-4daa-ba40-
>>>> 629b3223a92d@...l
>>>>> box.org/
>>>>> V2:
>>>>> https://lore.kernel.org/all/cover.1706863981.git.perry.yuan@amd.co
>>>>> m/
>>>>> v3:
>>>>> https://lore.kernel.org/lkml/cover.1707016927.git.perry.yuan@amd.c
>>>>> om/
>>>>> v4:
>>>>> https://lore.kernel.org/lkml/cover.1707193566.git.perry.yuan@amd.c
>>>>> om/
>>>>> v5:
>>>>> https://lore.kernel.org/lkml/cover.1707273526.git.perry.yuan@amd.c
>>>>> om/
>>>>> v6:
>>>>> https://lore.kernel.org/lkml/cover.1707363758.git.perry.yuan@amd.c
>>>>> om/
>>>>> v7:
>>>>> https://lore.kernel.org/lkml/cover.1710323410.git.perry.yuan@amd.c
>>>>> om/
>>>>> v8:
>>>>> https://lore.kernel.org/lkml/cover.1710754409.git.perry.yuan@amd.c
>>>>> om/
>>>>> v9:
>>>>> https://lore.kernel.org/lkml/cover.1710836407.git.perry.yuan@amd.c
>>>>> om/
>>>>> v10:
>>>>> https://lore.kernel.org/lkml/cover.1711335714.git.perry.yuan@amd.c
>>>>> om/
>>>>> v11:
>>>>> https://lore.kernel.org/lkml/cover.1713858800.git.perry.yuan@amd.c
>>>>> om/
>>>>>
>>>>>
>>>>> Gautham R. Shenoy (3):
>>>>> cpufreq: amd-pstate: Document *_limit_* fields in struct amd_cpudata
>>>>> cpufreq: amd-pstate: Document the units for freq variables in
>>>>> amd_cpudata
>>>>> cpufreq: amd-pstate: Remove
>>>>> amd_get_{min,max,nominal,lowest_nonlinear}_freq()
>>>>>
>>>>> Perry Yuan (5):
>>>>> cpufreq: amd-pstate: Unify computation of
>>>>> {max,min,nominal,lowest_nonlinear}_freq
>>>>> cpufreq: amd-pstate: Bail out if min/max/nominal_freq is 0
>>>>> cpufreq: amd-pstate: get transition delay and latency value from ACPI
>>>>> tables
>>>>> cppc_acpi: print error message if CPPC is unsupported
>>>>> cpufreq: amd-pstate: Add quirk for the pstate CPPC capabilities
>>>>> missing
>>>>>
>>>>> drivers/acpi/cppc_acpi.c | 4 +-
>>>>> drivers/cpufreq/amd-pstate.c | 257 +++++++++++++++++++++----------
>> ----
>>>>> include/linux/amd-pstate.h | 20 ++-
>>>>> 3 files changed, 174 insertions(+), 107 deletions(-)
>>>>>
>>>>> --
>>>>
>>>> Whole series applied as 6.10 material, thanks!
>>>
>>> Thank you so much for merging the changes!
>>
>> No problem.
>>
>> However, there are compiler warnings in the new material that need to be
>> addressed before it goes into linux-next.
>>
>> I've seen your patch addressing some of them, but there is still an unused local
>> variable to deal with.
>
> Thanks for your reminder.
> I have got that fixed with two patches.
>
> https://lore.kernel.org/lkml/20240430074857.2069301-1-perry.yuan@amd.com/
> https://lore.kernel.org/lkml/20240430074857.2069301-2-perry.yuan@amd.com/
>
> Hi @Limonciello, Mario @Shenoy, Gautham Ranjal
> Please help to review and ack the patch for patches merging.
>
> Perry.
They're simple and obviously correct and Rafael picked those two up
already this morning it looks.
Thanks!
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