diff options
| author |   Will Deacon <will.deacon@arm.com> | 2010-04-30 11:34:26 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2010-05-17 11:53:58 +0100 |
| commit | 929f5199448a67d41bb249d58815ef77bcd53622 (patch) | |
| tree | edb796c49205561ef98abb73f340e900225146dc /arch/arm | |
| parent | ARM: 6070/1: perf-events: add support for xscale PMUs (diff) | |
| download | linux-dev-929f5199448a67d41bb249d58815ef77bcd53622.tar.xz linux-dev-929f5199448a67d41bb249d58815ef77bcd53622.zip | |
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: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/perf_event.h | 3 | ||||
| -rw-r--r-- | arch/arm/kernel/perf_event.c | 12 |
2 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h index fa4b32625d37..48837e6d8887 100644 --- a/arch/arm/include/asm/perf_event.h +++ b/arch/arm/include/asm/perf_event.h @@ -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__ */ diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 381f1211233e..c45768614c8a 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -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) \ |