From 7d88eb695a1f5f67820e02999b949d5cfa080442 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 13 Jul 2016 17:16:36 +0000 Subject: arm/perf: Convert to hotplug state machine Straight forward conversion w/o bells and whistles. Signed-off-by: Thomas Gleixner Signed-off-by: Anna-Maria Gleixner Reviewed-by: Sebastian Andrzej Siewior Cc: Linus Torvalds Cc: Mark Rutland Cc: Peter Zijlstra Cc: Will Deacon Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153335.794097159@linutronix.de Signed-off-by: Ingo Molnar --- drivers/perf/arm_pmu.c | 36 +++++++++++++++--------------------- 1 file changed, 15 insertions(+), 21 deletions(-) (limited to 'drivers/perf/arm_pmu.c') diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 140436a046c0..ae9fc6c6add3 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -691,24 +691,15 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler) * UNKNOWN at reset, the PMU must be explicitly reset to avoid reading * junk values out of them. */ -static int cpu_pmu_notify(struct notifier_block *b, unsigned long action, - void *hcpu) +static int arm_perf_starting_cpu(unsigned int cpu) { - int cpu = (unsigned long)hcpu; - struct arm_pmu *pmu = container_of(b, struct arm_pmu, hotplug_nb); - - if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING) - return NOTIFY_DONE; - - if (!cpumask_test_cpu(cpu, &pmu->supported_cpus)) - return NOTIFY_DONE; - - if (pmu->reset) - pmu->reset(pmu); - else - return NOTIFY_DONE; - - return NOTIFY_OK; + if (!__oprofile_cpu_pmu) + return 0; + if (!cpumask_test_cpu(cpu, &__oprofile_cpu_pmu->supported_cpus)) + return 0; + if (__oprofile_cpu_pmu->reset) + __oprofile_cpu_pmu->reset(__oprofile_cpu_pmu); + return 0; } #ifdef CONFIG_CPU_PM @@ -819,8 +810,9 @@ static int cpu_pmu_init(struct arm_pmu *cpu_pmu) if (!cpu_hw_events) return -ENOMEM; - cpu_pmu->hotplug_nb.notifier_call = cpu_pmu_notify; - err = register_cpu_notifier(&cpu_pmu->hotplug_nb); + err = cpuhp_setup_state_nocalls(CPUHP_AP_PERF_ARM_STARTING, + "AP_PERF_ARM_STARTING", + arm_perf_starting_cpu, NULL); if (err) goto out_hw_events; @@ -858,7 +850,7 @@ static int cpu_pmu_init(struct arm_pmu *cpu_pmu) return 0; out_unregister: - unregister_cpu_notifier(&cpu_pmu->hotplug_nb); + cpuhp_remove_state_nocalls(CPUHP_AP_PERF_ARM_STARTING); out_hw_events: free_percpu(cpu_hw_events); return err; @@ -867,7 +859,7 @@ out_hw_events: static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu) { cpu_pm_pmu_unregister(cpu_pmu); - unregister_cpu_notifier(&cpu_pmu->hotplug_nb); + cpuhp_remove_state_nocalls(CPUHP_AP_PERF_ARM_STARTING); free_percpu(cpu_pmu->hw_events); } @@ -1027,6 +1019,8 @@ int arm_pmu_device_probe(struct platform_device *pdev, if (ret) goto out_destroy; + WARN(__oprofile_cpu_pmu, "%s(): missing PMU strucure for CPU-hotplug\n", + __func__); if (!__oprofile_cpu_pmu) __oprofile_cpu_pmu = pmu; -- cgit v1.2.3-55-g7522