diff options
Diffstat (limited to 'arch/arm/kernel/perf_event_cpu.c')
-rw-r--r-- | arch/arm/kernel/perf_event_cpu.c | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c index 56ddc989c90..8d7d8d4de9d 100644 --- a/arch/arm/kernel/perf_event_cpu.c +++ b/arch/arm/kernel/perf_event_cpu.c @@ -70,6 +70,67 @@ static struct pmu_hw_events *cpu_pmu_get_cpu_events(void) return &__get_cpu_var(cpu_hw_events); } +static void cpu_pmu_free_irq(void) +{ + int i, irq, irqs; + struct platform_device *pmu_device = cpu_pmu->plat_device; + + irqs = min(pmu_device->num_resources, num_possible_cpus()); + + for (i = 0; i < irqs; ++i) { + if (!cpumask_test_and_clear_cpu(i, &cpu_pmu->active_irqs)) + continue; + irq = platform_get_irq(pmu_device, i); + if (irq >= 0) + free_irq(irq, cpu_pmu); + } +} + +static int cpu_pmu_request_irq(irq_handler_t handler) +{ + int i, err, irq, irqs; + struct platform_device *pmu_device = cpu_pmu->plat_device; + + if (!pmu_device) + return -ENODEV; + + irqs = min(pmu_device->num_resources, num_possible_cpus()); + if (irqs < 1) { + pr_err("no irqs for PMUs defined\n"); + return -ENODEV; + } + + for (i = 0; i < irqs; ++i) { + err = 0; + irq = platform_get_irq(pmu_device, i); + if (irq < 0) + continue; + + /* + * If we have a single PMU interrupt that we can't shift, + * assume that we're running on a uniprocessor machine and + * continue. Otherwise, continue without this interrupt. + */ + if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) { + pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n", + irq, i); + continue; + } + + err = request_irq(irq, handler, IRQF_NOBALANCING, "arm-pmu", + cpu_pmu); + if (err) { + pr_err("unable to request IRQ%d for ARM PMU counters\n", + irq); + return err; + } + + cpumask_set_cpu(i, &cpu_pmu->active_irqs); + } + + return 0; +} + static void __devinit cpu_pmu_init(struct arm_pmu *cpu_pmu) { int cpu; @@ -79,7 +140,10 @@ static void __devinit cpu_pmu_init(struct arm_pmu *cpu_pmu) events->used_mask = per_cpu(used_mask, cpu); raw_spin_lock_init(&events->pmu_lock); } - cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events; + + cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events; + cpu_pmu->request_irq = cpu_pmu_request_irq; + cpu_pmu->free_irq = cpu_pmu_free_irq; /* Ensure the PMU has sane values out of reset. */ if (cpu_pmu && cpu_pmu->reset) |