ARM: 6071/1: perf-events: allow modules to query the number of hardware counters (929f5199) · Commits · 戴 / test

For OProfile to initialise oprofilefs correctly, it needs to know the number of counters it can represent. This patch adds a function to the ARM perf-events backend to return the number of hardware counters available for the current PMU. Cc: Jamie Iles <jamie.iles@picochip.com> Signed-off-by:

Will Deacon <will.deacon@arm.com> Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/perf_event.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -42,4 +42,7 @@ enum arm_perf_pmu_ids {
		extern enum arm_perf_pmu_ids
		armpmu_get_pmu_id(void);

		extern int
		armpmu_get_max_events(void);

		#endif /* __ARM_PERF_EVENT_H__ */

arch/arm/kernel/perf_event.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -111,6 +111,18 @@ armpmu_get_pmu_id(void)
		}
		EXPORT_SYMBOL_GPL(armpmu_get_pmu_id);

		int
		armpmu_get_max_events(void)
		{
		int max_events = 0;

		if (armpmu != NULL)
		max_events = armpmu->num_events;

		return max_events;
		}
		EXPORT_SYMBOL_GPL(armpmu_get_max_events);

		#define HW_OP_UNSUPPORTED 0xFFFF

		#define C(_x) \

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