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>
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 140436a..ae9fc6c 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -691,24 +691,15 @@
* 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 @@
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 @@
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 @@
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 @@
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;