Messages in this thread | | | From | Anshuman Khandual <> | Subject | [PATCH V5 0/7] arm64/perf: Enable branch stack sampling | Date | Mon, 7 Nov 2022 11:55:07 +0530 |
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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
This series applies on v6.1-rc4.
Changes in V5:
- Changed BRBCR_EL1.VIRTUAL from 0b1 to 0b01 - Changed BRBFCR_EL1.EnL into BRBFCR_EL1.EnI - Changed config ARM_BRBE_PMU from 'tristate' to 'bool'
Changes in V4:
https://lore.kernel.org/all/20221017055713.451092-1-anshuman.khandual@arm.com/
- Changed ../tools/sysreg declarations as suggested - Set PERF_SAMPLE_BRANCH_STACK in data.sample_flags - Dropped perfmon_capable() check in armpmu_event_init() - s/pr_warn_once/pr_info in armpmu_event_init() - Added brbe_format element into struct pmu_hw_events - Changed v1p1 as brbe_v1p1 in struct pmu_hw_events - Dropped pr_info() from arm64_pmu_brbe_probe(), solved LOCKDEP warning
Changes in V3:
https://lore.kernel.org/all/20220929075857.158358-1-anshuman.khandual@arm.com/
- Moved brbe_stack from the stack and now dynamically allocated - Return PERF_BR_PRIV_UNKNOWN instead of -1 in brbe_fetch_perf_priv() - Moved BRBIDR0, BRBCR, BRBFCR registers and fields into tools/sysreg - Created dummy BRBINF_EL1 field definitions in tools/sysreg - Dropped ARMPMU_EVT_PRIV framework which cached perfmon_capable() - Both exception and exception return branche records are now captured only if the event has PERF_SAMPLE_BRANCH_KERNEL which would already been checked in generic perf via perf_allow_kernel()
Changes in V2:
https://lore.kernel.org/all/20220908051046.465307-1-anshuman.khandual@arm.com/
- Dropped branch sample filter helpers consolidation patch from this series - Added new hw_perf_event.flags element ARMPMU_EVT_PRIV to cache perfmon_capable() - Use cached perfmon_capable() while configuring BRBE branch record filters
Changes in V1:
https://lore.kernel.org/linux-arm-kernel/20220613100119.684673-1-anshuman.khandual@arm.com/
- Added CONFIG_PERF_EVENTS wrapper for all branch sample filter helpers - Process new perf branch types via PERF_BR_EXTEND_ABI
Changes in RFC V2:
https://lore.kernel.org/linux-arm-kernel/20220412115455.293119-1-anshuman.khandual@arm.com/
- Added branch_sample_priv() while consolidating other branch sample filter helpers - Changed all SYS_BRBXXXN_EL1 register definition encodings per Marc - Changed the BRBE driver as per proposed BRBE related perf ABI changes (V5) - Added documentation for struct arm_pmu changes, updated commit message - Updated commit message for BRBE detection infrastructure patch - PERF_SAMPLE_BRANCH_KERNEL gets checked during arm event init (outside the driver) - Branch privilege state capture mechanism has now moved inside the driver
Changes in RFC V1:
https://lore.kernel.org/all/1642998653-21377-1-git-send-email-anshuman.khandual@arm.com/
Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mark Brown <broonie@kernel.org> Cc: James Clark <james.clark@arm.com> Cc: Rob Herring <robh@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: Suzuki Poulose <suzuki.poulose@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org
Anshuman Khandual (7): arm64/perf: Add BRBE registers and fields arm64/perf: Update struct arm_pmu for BRBE arm64/perf: Update struct pmu_hw_events for BRBE driver/perf/arm_pmu_platform: Add support for BRBE attributes detection arm64/perf: Drive BRBE from perf event states arm64/perf: Add BRBE driver arm64/perf: Enable branch stack sampling
arch/arm64/include/asm/sysreg.h | 103 ++++++++ arch/arm64/kernel/perf_event.c | 49 ++++ arch/arm64/tools/sysreg | 161 ++++++++++++ drivers/perf/Kconfig | 11 + drivers/perf/Makefile | 1 + drivers/perf/arm_pmu.c | 66 ++++- drivers/perf/arm_pmu_brbe.c | 441 ++++++++++++++++++++++++++++++++ drivers/perf/arm_pmu_brbe.h | 259 +++++++++++++++++++ drivers/perf/arm_pmu_platform.c | 34 +++ include/linux/perf/arm_pmu.h | 68 +++++ 10 files changed, 1190 insertions(+), 3 deletions(-) create mode 100644 drivers/perf/arm_pmu_brbe.c create mode 100644 drivers/perf/arm_pmu_brbe.h
-- 2.25.1
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