From abdf655a30b6464fe86c8369de60ccf92f73f589 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Tue, 21 Oct 2014 14:11:23 +0100 Subject: [PATCH] arm: perf: dynamically allocate cpu hardware data 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 Reviewed-by: Stephen Boyd Signed-off-by: Will Deacon --- arch/arm/kernel/perf_event_cpu.c | 33 ++++++++++++++++++++++++-------- 1 file changed, 25 insertions(+), 8 deletions(-) diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c index b9391fa2368d..f0f6c5ef41b0 100644 --- a/arch/arm/kernel/perf_event_cpu.c +++ b/arch/arm/kernel/perf_event_cpu.c @@ -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); -- 2.45.2