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Commit 929f5199 authored by Will Deacon's avatar Will Deacon Committed by Russell King
Browse files

ARM: 6071/1: perf-events: allow modules to query the number of hardware counters 



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: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 49e6a32f

arch/arm/include/asm/perf_event.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -42,4 +42,7 @@ enum arm_perf_pmu_ids { 
extern enum arm_perf_pmu_ids

extern enum arm_perf_pmu_ids

armpmu_get_pmu_id(void);

armpmu_get_pmu_id(void);





extern int

armpmu_get_max_events(void);



#endif /* __ARM_PERF_EVENT_H__ */
 
#endif /* __ARM_PERF_EVENT_H__ */

arch/arm/kernel/perf_event.c

+12 −0
Original line number Original line Diff line number Diff line
@@ -111,6 +111,18 @@ armpmu_get_pmu_id(void) 
}

}

EXPORT_SYMBOL_GPL(armpmu_get_pmu_id);

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 HW_OP_UNSUPPORTED		0xFFFF





#define C(_x) \

#define C(_x) \