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

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Date:   Wed, 25 Nov 2020 23:48:43 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     rjw@...ysocki.net
Cc:     Punit Agrawal <punitagrawal@...il.com>, wei.huang2@....com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        bp@...en8.de, x86@...nel.org
Subject: [RFC PATCH 0/4] Add processor to the ignore PSD override list

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.

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

-- 
2.29.2