Commit-ID: cc727977acb0fe05b7aa1f00cccb893530820895
Gitweb: http://git.kernel.org/tip/cc727977acb0fe05b7aa1f00cccb893530820895
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Wed, 17 Aug 2016 19:14:20 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 1 Sep 2016 18:38:28 +0200
arm/perf: Use multi instance instead of custom list
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: rt@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20160817171420.sdwk2qivxunzryz4@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/perf/arm_pmu.c | 44 ++++++++++++++++++--------------------------
include/linux/perf/arm_pmu.h | 2 +-
2 files changed, 19 insertions(+), 27 deletions(-)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index c494613..b2f742f 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -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;
-
- spin_lock(&arm_pmu_lock);
- list_for_each_entry(pmu, &arm_pmu_list, entry) {
+ struct arm_pmu *pmu = hlist_entry_safe(node, struct arm_pmu, node);
- 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);
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index e188438..4ad1b40 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -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;
};
--
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