From: Mark Brown <broonie@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, will@kernel.org,
catalin.marinas@arm.com, mark.rutland@arm.com,
James Clark <james.clark@arm.com>, Rob Herring <robh@kernel.org>,
Marc Zyngier <maz@kernel.org>,
Suzuki Poulose <suzuki.poulose@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
linux-perf-users@vger.kernel.org
Subject: Re: [PATCH V9 00/10] arm64/perf: Enable branch stack sampling
Date: Tue, 21 Mar 2023 19:02:40 +0000 [thread overview]
Message-ID: <655ff114-99d2-4612-9167-cc8688f2b6b2@sirena.org.uk> (raw)
In-Reply-To: <20230315051444.1683170-1-anshuman.khandual@arm.com>
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On Wed, Mar 15, 2023 at 10:44:34AM +0530, Anshuman Khandual wrote:
> This series enables perf branch stack sampling support on arm64 platform
> via a new arch feature called Branch Record Buffer Extension (BRBE). All
> relevant register definitions could be accessed here.
>
> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers
While looking at another feature I noticed that HFGITR_EL2 has two traps
for BRBE instructions, nBRBINJ and nBRBIALL which trap BRB INJ and BRB
IALL. Even if we don't use those right now does it make sense to
document a requirement for those traps to be disabled now in case we
need them later, and do so during EL2 setup for KVM guests? That could
always be done incrementally.
I've got a patch adding the definition of that register to sysreg which
I should be sending shortly, no need to duplicate that effort.
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next prev parent reply other threads:[~2023-03-21 19:03 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 5:14 [PATCH V9 00/10] arm64/perf: Enable branch stack sampling Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 01/10] drivers: perf: arm_pmu: Add new sched_task() callback Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 02/10] arm64/perf: Add BRBE registers and fields Anshuman Khandual
2023-04-12 8:32 ` Yang Shen
2023-05-15 6:22 ` Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 03/10] arm64/perf: Add branch stack support in struct arm_pmu Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 04/10] arm64/perf: Add branch stack support in struct pmu_hw_events Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 05/10] arm64/perf: Add branch stack support in ARMV8 PMU Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 06/10] arm64/perf: Enable branch stack events via FEAT_BRBE Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 07/10] arm64/perf: Add PERF_ATTACH_TASK_DATA to events with has_branch_stack() Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 08/10] arm64/perf: Add struct brbe_regset helper functions Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 09/10] arm64/perf: Implement branch records save on task sched out Anshuman Khandual
2023-03-15 5:14 ` [PATCH V9 10/10] arm64/perf: Implement branch records save on PMU IRQ Anshuman Khandual
2023-05-23 14:39 ` James Clark
2023-05-23 14:51 ` James Clark
2023-05-24 3:10 ` Anshuman Khandual
2023-03-21 19:02 ` Mark Brown [this message]
2023-03-23 4:25 ` [PATCH V9 00/10] arm64/perf: Enable branch stack sampling Anshuman Khandual
2023-03-23 12:54 ` Mark Brown
2023-03-24 3:20 ` Anshuman Khandual
2023-03-24 11:40 ` Mark Brown
2023-04-11 13:03 ` Will Deacon
2023-05-15 6:24 ` Anshuman Khandual
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