linux-kernel - Re: [PATCH v4 0/8] perf: arm: Make PMUv3 driver available for aarch32

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Date:   Tue, 21 Mar 2023 09:44:57 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Zaid Al-Bassam <zalbassam@...gle.com>,
        Jesus Sanchez-Palencia <jesussanp@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Zenghui Yu <yuzenghui@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v4 0/8] perf: arm: Make PMUv3 driver available for aarch32

On 3/17/23 12:50, Zaid Al-Bassam wrote:
> Currently, PMUv3 driver is only available for ARMv8 aarch64 platforms,
> ARMv8 platorms running in aarch32 mode dont have access to the driver.
> This is, especially, a problem for ARMv8 platforms that only have
> aarch32 support, like the Cortex-A32.
> 
> Make the PMUv3 driver available to arm arch (ARMv8 aarch32) by moving
> the PMUv3 driver from arm64 to drivers, that makes the driver common
> to both arm and arm64 architectures, then add PMUv3 arm Support.
> 
> The main work in this patchset was made a while back by Marc Zyngier
> in [1]. Patchset version 1 [v1] rebases Marc's patches to the latest
> kernel revision and adds additional patches to accommodate the changes
> in the kernel since Marc wrote the patches.
> 
> version 2 [v2] of the patchset was created by Marc Zyngier and I
> picked it up from [2].
> 
> Changes in v2:
> - Flattened the nested switches in the arm_pmuv3.h for arm.
> - Removed wrappers and added stubs for the PMU KVM functions for arm.
> - Added PMU version abstractions.
> 
> Changes in v3:
> - Removed the link tag from the commit messages.
> - Fixed the license header in the arm_pmuv3.h files.
> 
> Changes in v4:
> - Rebased to 6.3.0-rc2 (Clean rebase)
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=kvm-arm/pmuv3-32bit
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=arm/pmuv3
> 
> [v1] https://lore.kernel.org/all/20230126204444.2204061-1-zalbassam@google.com/
> [v2] https://lore.kernel.org/all/20230210165500.2292608-1-zalbassam@google.com/
> [v3] https://lore.kernel.org/all/20230213210319.1075872-1-zalbassam@google.com/
> 
> Thank you,
> Zaid Al-Bassam

Tested-by: Florian Fainelli <f.fainelli@...il.com>

on Cortex-A53 and Cortex-A72, thanks!
-- 
Florian