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arm/perf: Use multi instance instead of custom list

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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160817171420.sdwk2qivxunzryz4@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-08-17 19:14:20 +02:00 committed by Thomas Gleixner
parent cf392d10b6
commit 6e103c0cfe
2 changed files with 19 additions and 27 deletions
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44
drivers/perf/arm_pmu.c
View File

@ -688,28 +688,20 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)
return 0;
}
static DEFINE_SPINLOCK(arm_pmu_lock);
static LIST_HEAD(arm_pmu_list);
/*
* PMU hardware loses all context when a CPU goes offline.
* When a CPU is hotplugged back in, since some hardware registers are
* UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
* junk values out of them.
*/
static int arm_perf_starting_cpu(unsigned int cpu)
static int arm_perf_starting_cpu(unsigned int cpu, struct hlist_node *node)
{
struct arm_pmu *pmu;
struct arm_pmu *pmu = hlist_entry_safe(node, struct arm_pmu, node);
spin_lock(&arm_pmu_lock);
list_for_each_entry(pmu, &arm_pmu_list, entry) {
if (!cpumask_test_cpu(cpu, &pmu->supported_cpus))
continue;
if (pmu->reset)
pmu->reset(pmu);
}
spin_unlock(&arm_pmu_lock);
if (!cpumask_test_cpu(cpu, &pmu->supported_cpus))
return 0;
if (pmu->reset)
pmu->reset(pmu);
return 0;
}
@ -821,9 +813,10 @@ static int cpu_pmu_init(struct arm_pmu *cpu_pmu)
if (!cpu_hw_events)
return -ENOMEM;
spin_lock(&arm_pmu_lock);
list_add_tail(&cpu_pmu->entry, &arm_pmu_list);
spin_unlock(&arm_pmu_lock);
err = cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_STARTING,
&cpu_pmu->node);
if (err)
goto out_free;
err = cpu_pm_pmu_register(cpu_pmu);
if (err)
@ -859,9 +852,9 @@ static int cpu_pmu_init(struct arm_pmu *cpu_pmu)
return 0;
out_unregister:
spin_lock(&arm_pmu_lock);
list_del(&cpu_pmu->entry);
spin_unlock(&arm_pmu_lock);
cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_STARTING,
&cpu_pmu->node);
out_free:
free_percpu(cpu_hw_events);
return err;
}
@ -869,9 +862,8 @@ out_unregister:
static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu)
{
cpu_pm_pmu_unregister(cpu_pmu);
spin_lock(&arm_pmu_lock);
list_del(&cpu_pmu->entry);
spin_unlock(&arm_pmu_lock);
cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_STARTING,
&cpu_pmu->node);
free_percpu(cpu_pmu->hw_events);
}
@ -1068,9 +1060,9 @@ static int arm_pmu_hp_init(void)
{
int ret;
ret = cpuhp_setup_state_nocalls(CPUHP_AP_PERF_ARM_STARTING,
"AP_PERF_ARM_STARTING",
arm_perf_starting_cpu, NULL);
ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_STARTING,
"AP_PERF_ARM_STARTING",
arm_perf_starting_cpu, NULL);
if (ret)
pr_err("CPU hotplug notifier for ARM PMU could not be registered: %d\n",
ret);

2
include/linux/perf/arm_pmu.h
View File

@ -109,7 +109,7 @@ struct arm_pmu {
DECLARE_BITMAP(pmceid_bitmap, ARMV8_PMUV3_MAX_COMMON_EVENTS);
struct platform_device *plat_device;
struct pmu_hw_events __percpu *hw_events;
struct list_head entry;
struct hlist_node node;
struct notifier_block cpu_pm_nb;
};