[PATCH V6 3/7] arm64/perf: Add branch stack support in struct arm_pmu
From: Anshuman Khandual <hidden>
Date: 2022-12-08 08:45:15
Also in:
linux-perf-users, lkml
Subsystem:
arm pmu profiling and debugging, the rest · Maintainers:
Will Deacon, Mark Rutland, Linus Torvalds
This updates 'struct arm_pmu' for branch stack sampling support later. This adds a new 'features' element in the structure to track supported features, and another 'hw_attr' element to encapsulate implementation attributes on a given 'struct arm_pmu'. These updates here will help in tracking any branch stack sampling support, which is being added later. This also adds a helper arm_pmu_branch_stack_supported(). Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <redacted> --- include/linux/perf/arm_pmu.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 60d4e4c9b3ea..8c4f42189904 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h@@ -80,11 +80,14 @@ enum armpmu_attr_groups { ARMPMU_NR_ATTR_GROUPS }; +#define ARM_PMU_BRANCH_STACK BIT(0) + struct arm_pmu { struct pmu pmu; cpumask_t supported_cpus; char *name; int pmuver; + int features; irqreturn_t (*handle_irq)(struct arm_pmu *pmu); void (*enable)(struct perf_event *event); void (*disable)(struct perf_event *event);
@@ -119,8 +122,14 @@ struct arm_pmu { /* Only to be used by ACPI probing code */ unsigned long acpi_cpuid; + void *hw_attr; }; +static inline bool arm_pmu_branch_stack_supported(struct arm_pmu *armpmu) +{ + return armpmu->features & ARM_PMU_BRANCH_STACK; +} + #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) u64 armpmu_event_update(struct perf_event *event);
--
2.25.1
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