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ARM: perf: indirect access to cpu_hw_events 

Currently, cpu_hw_events is a global per-CPU variable. To enable
support for multiple PMUs, there needs to be a mapping from an instance
of arm_pmu to its cpu_hw_events. Additionally, as system PMUs are not
CPU-affine, they should not have this stored per-CPU.

This patch moves access to the hardware events data behind an accessor
function (arm_pmu::get_hw_events). This allows each instance to have
its own hardware event data, which can be stored per-CPU or globally as
required.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2011-05-04 09:23:51 +01:00 committed by Will Deacon
parent a9356a04fa
commit 92f701e1f4
1 changed files with 15 additions and 3 deletions
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18
arch/arm/kernel/perf_event.c
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@ -84,6 +84,7 @@ struct arm_pmu {
struct mutex reserve_mutex;
u64 max_period;
struct platform_device *plat_device;
struct cpu_hw_events *(*get_hw_events)(void);
};
/* Set at runtime when we know what CPU type we are. */
@ -284,7 +285,7 @@ armpmu_start(struct perf_event *event, int flags)
static void
armpmu_del(struct perf_event *event, int flags)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct cpu_hw_events *cpuc = armpmu->get_hw_events();
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
@ -300,7 +301,7 @@ armpmu_del(struct perf_event *event, int flags)
static int
armpmu_add(struct perf_event *event, int flags)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct cpu_hw_events *cpuc = armpmu->get_hw_events();
struct hw_perf_event *hwc = &event->hw;
int idx;
int err = 0;
@ -585,7 +586,7 @@ static void armpmu_enable(struct pmu *pmu)
{
/* Enable all of the perf events on hardware. */
int idx, enabled = 0;
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct cpu_hw_events *cpuc = armpmu->get_hw_events();
for (idx = 0; idx < armpmu->num_events; ++idx) {
struct perf_event *event = cpuc->events[idx];
@ -678,6 +679,16 @@ static int __init register_pmu_driver(void)
}
device_initcall(register_pmu_driver);
static struct cpu_hw_events *armpmu_get_cpu_events(void)
{
return &__get_cpu_var(cpu_hw_events);
}
static void __init cpu_pmu_init(struct arm_pmu *armpmu)
{
armpmu->get_hw_events = armpmu_get_cpu_events;
}
/*
* CPU PMU identification and registration.
*/
@ -728,6 +739,7 @@ init_hw_perf_events(void)
if (armpmu) {
pr_info("enabled with %s PMU driver, %d counters available\n",
armpmu->name, armpmu->num_events);
cpu_pmu_init(armpmu);
armpmu_init(armpmu);
perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW);
} else {