linux-kernel - Re: [PATCH v2 00/12] arm64: Add support for Armv9.4 PMU fixed instruction counter

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Message-ID: <20240710123620.GA14423@willie-the-truck>
Date: Wed, 10 Jul 2024 13:36:20 +0100
From: Will Deacon <will@...nel.org>
To: Russell King <linux@...linux.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	James Clark <james.clark@....com>,
	"Rob Herring (Arm)" <robh@...nel.org>
Cc: kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	kvmarm@...ts.linux.dev
Subject: Re: [PATCH v2 00/12] arm64: Add support for Armv9.4 PMU fixed
 instruction counter

On Wed, Jul 03, 2024 at 03:38:44PM +0100, Will Deacon wrote:
> On Wed, 26 Jun 2024 16:32:24 -0600, Rob Herring (Arm) wrote:
> > This series adds support for the optional fixed instruction counter
> > added in Armv9.4 PMU. Most of the series is a refactoring to remove the
> > index to counter number conversion which dates back to the Armv7 PMU
> > driver. Removing it is necessary in order to support more than 32
> > counters without a bunch of conditional code further complicating the
> > conversion.
> > 
> > [...]
> 
> Applied to will (for-next/perf), thanks!
> 
> [01/12] perf: arm_pmuv3: Avoid assigning fixed cycle counter with threshold
>         https://git.kernel.org/will/c/81e15ca3e523
> [02/12] perf: arm_pmuv3: Drop unnecessary IS_ENABLED(CONFIG_ARM64) check
>         https://git.kernel.org/will/c/598c1a2d9f4b
> [03/12] perf/arm: Move 32-bit PMU drivers to drivers/perf/
>         https://git.kernel.org/will/c/8d75537bebfa
> [04/12] perf: arm_v6/7_pmu: Drop non-DT probe support
>         https://git.kernel.org/will/c/12f051c987dc
> [05/12] perf: arm_pmuv3: Include asm/arm_pmuv3.h from linux/perf/arm_pmuv3.h
>         https://git.kernel.org/will/c/d688ffa26942

I've had an off-list report that this series causes a kernel crash under
KVM unit tests (panic in write_pmevtypern()).

Given that I don't have enough information to repro/debug and Catalin is
tagging the arm64 branch for 6.11 today, I've dropped patches 6-12 for
now. Please can you send a fixed version after the merge window?

Cheers,

Will