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

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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>
This commit is contained in:
Will Deacon 2010-04-30 11:34:26 +01:00 committed by Russell King
parent 49e6a32f2f
commit 929f519944
2 changed files with 15 additions and 0 deletions
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3
arch/arm/include/asm/perf_event.h
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@ -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__ */

12
arch/arm/kernel/perf_event.c
View File

@ -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) \