Messages in this thread | | | From | Anshuman Khandual <> | Subject | [PATCH V2 0/7] arm64/perf: Enable branch stack sampling | Date | Thu, 8 Sep 2022 10:40:39 +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 v6.0-rc4 after the BRBE related perf ABI changes series (V7) that was posted earlier, and a branch sample filter helper patch.
https://lore.kernel.org/all/20220824044822.70230-1-anshuman.khandual@arm.com/
https://lore.kernel.org/all/20220906084414.396220-1-anshuman.khandual@arm.com/
Following issues have been resolved
- Jame's concerns regarding permission inadequacy related to perfmon_capable() - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable()
Following issues remain inconclusive
- Rob's concerns regarding the series structure, arm_pmu callbacks based framework
Changes in V2:
- 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: James Clark <james.clark@arm.com> Cc: Rob Herring <robh@kernel.org> Cc: Marc Zyngier <maz@kernel.org> 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 register definitions for BRBE 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 | 222 ++++++++++++++++ arch/arm64/kernel/perf_event.c | 48 ++++ drivers/perf/Kconfig | 11 + drivers/perf/Makefile | 1 + drivers/perf/arm_pmu.c | 82 +++++- drivers/perf/arm_pmu_brbe.c | 448 ++++++++++++++++++++++++++++++++ drivers/perf/arm_pmu_brbe.h | 259 ++++++++++++++++++ drivers/perf/arm_pmu_platform.c | 34 +++ include/linux/perf/arm_pmu.h | 67 +++++ 9 files changed, 1169 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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