diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2016-07-13 17:16:36 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 10:40:23 +0200 |
| commit | 7d88eb695a1f5f67820e02999b949d5cfa080442 (patch) | |
| tree | b7f811547579d68a007fee254ca190ae74f19974 /drivers/perf | |
| parent | e5b61bafe70477e05e1dce0d6ca4ec181e23cb2a (diff) | |
| download | linux-7d88eb695a1f5f67820e02999b949d5cfa080442.tar.bz2 | |
arm/perf: Convert to hotplug state machine
Straight forward conversion w/o bells and whistles.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153335.794097159@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_pmu.c | 36 |
1 files changed, 15 insertions, 21 deletions
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; |