linux-kernel - Re: [RFC PATCH 0/4] Add processor to the ignore PSD override list

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Date:   Sat, 05 Dec 2020 07:44:41 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     rjw@...ysocki.net
Cc:     wei.huang2@....com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, bp@...en8.de, x86@...nel.org
Subject: Re: [RFC PATCH 0/4] Add processor to the ignore PSD override list

Hi Rafael,

Punit Agrawal <punitagrawal@...il.com> writes:

> Hi,
>
> While looking into Giovanni's patches to enable frequency invariance
> on AMD systems[0], I noticed an issue with initialising frequency
> domain information on a recent AMD APU.
>
> Patch 1 refactors the test to ignore firmware provided frequency
> domain into a separate function.
>
> Patch 2 adds said APU (Family: 0x17, Model: 0x60, Stepping: 0x01) to
> the list of CPUs for which the PSD override is ignored. I am not quite
> happy with having to special case a particular CPU but also couldn't
> find any documentation to help identify the CPUs that don't need the
> override.

Are you be OK to pick the first two patches if there are no issues?

Thanks,
Punit


> Patch 3 and 4 are somewhat independent and a first step towards
> improving the situation with regards to the use of raw identifiers for
> AMD processors throughout the kernel.
>
> All feedback welcome.
>
> Thanks,
> Punit
>
> [0] https://lore.kernel.org/linux-acpi/20201112182614.10700-1-ggherdovich@suse.cz/
>
> Punit Agrawal (4):
>   cpufreq: acpi-cpufreq: Re-factor overriding ACPI PSD
>   cpufreq: acpi-cpufreq: Add processor to the ignore PSD override list
>   x86/cpu: amd: Define processor families
>   cpufreq: acpi-cpufreq: Use identifiers for AMD processor family
>
>  arch/x86/include/asm/amd-family.h    | 18 ++++++++++++++++++
>  arch/x86/include/asm/cpu_device_id.h |  2 ++
>  drivers/cpufreq/acpi-cpufreq.c       | 24 +++++++++++++++++++++---
>  3 files changed, 41 insertions(+), 3 deletions(-)
>  create mode 100644 arch/x86/include/asm/amd-family.h