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arm: perf: dynamically allocate cpu hardware data

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To support multiple PMUs, each PMU will need its own accounting data.
As we don't know how (in general) many PMUs we'll have to support at
compile-time, we must allocate the data at runtime dynamically

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2014-10-21 14:11:23 +01:00 committed by Will Deacon
parent 5ebd920034
commit abdf655a30
1 changed files with 25 additions and 8 deletions
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33
arch/arm/kernel/perf_event_cpu.c
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@ -35,8 +35,6 @@
/* Set at runtime when we know what CPU type we are. */
static struct arm_pmu *cpu_pmu;
static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
/*
* Despite the names, these two functions are CPU-specific and are used
* by the OProfile/perf code.
@ -162,16 +160,22 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)
return 0;
}
static void cpu_pmu_init(struct arm_pmu *cpu_pmu)
static int cpu_pmu_init(struct arm_pmu *cpu_pmu)
{
int cpu;
struct pmu_hw_events __percpu *cpu_hw_events;
cpu_hw_events = alloc_percpu(struct pmu_hw_events);
if (!cpu_hw_events)
return -ENOMEM;
for_each_possible_cpu(cpu) {
struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
struct pmu_hw_events *events = per_cpu_ptr(cpu_hw_events, cpu);
raw_spin_lock_init(&events->pmu_lock);
events->percpu_pmu = cpu_pmu;
}
cpu_pmu->hw_events = &cpu_hw_events;
cpu_pmu->hw_events = cpu_hw_events;
cpu_pmu->request_irq = cpu_pmu_request_irq;
cpu_pmu->free_irq = cpu_pmu_free_irq;
@ -182,6 +186,13 @@ static void cpu_pmu_init(struct arm_pmu *cpu_pmu)
/* If no interrupts available, set the corresponding capability flag */
if (!platform_get_irq(cpu_pmu->plat_device, 0))
cpu_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
return 0;
}
static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu)
{
free_percpu(cpu_pmu->hw_events);
}
/*
@ -303,12 +314,18 @@ static int cpu_pmu_device_probe(struct platform_device *pdev)
goto out_free;
}
cpu_pmu_init(cpu_pmu);
ret = cpu_pmu_init(cpu_pmu);
if (ret)
goto out_free;
ret = armpmu_register(cpu_pmu, -1);
if (ret)
goto out_destroy;
if (!ret)
return 0;
return 0;
out_destroy:
cpu_pmu_destroy(cpu_pmu);
out_free:
pr_info("failed to register PMU devices!\n");
kfree(pmu);