From b230f0db913136f465a951806f2978b179df95d5 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 12 Aug 2016 19:49:41 +0200 Subject: [PATCH] bus/arm-cci: Use cpu-hp's multi instance support instead custom list Signed-off-by: Sebastian Andrzej Siewior Cc: Mark Rutland Cc: Suzuki K Poulose Cc: Peter Zijlstra Cc: Will Deacon Cc: rt@linutronix.de Cc: Olof Johansson Link: http://lkml.kernel.org/r/1471024183-12666-5-git-send-email-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner --- drivers/bus/arm-cci.c | 45 +++++++++++++++++-------------------------- 1 file changed, 18 insertions(+), 27 deletions(-) diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index 5755907f836f..4c44ba2d3412 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -144,15 +144,12 @@ struct cci_pmu { int num_cntrs; atomic_t active_events; struct mutex reserve_mutex; - struct list_head entry; + struct hlist_node node; cpumask_t cpus; }; #define to_cci_pmu(c) (container_of(c, struct cci_pmu, pmu)) -static DEFINE_MUTEX(cci_pmu_mutex); -static LIST_HEAD(cci_pmu_list); - enum cci_models { #ifdef CONFIG_ARM_CCI400_PMU CCI400_R0, @@ -1506,25 +1503,21 @@ static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev) return perf_pmu_register(&cci_pmu->pmu, name, -1); } -static int cci_pmu_offline_cpu(unsigned int cpu) +static int cci_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) { - struct cci_pmu *cci_pmu; + struct cci_pmu *cci_pmu = hlist_entry_safe(node, struct cci_pmu, node); unsigned int target; - mutex_lock(&cci_pmu_mutex); - list_for_each_entry(cci_pmu, &cci_pmu_list, entry) { - if (!cpumask_test_and_clear_cpu(cpu, &cci_pmu->cpus)) - continue; - target = cpumask_any_but(cpu_online_mask, cpu); - if (target >= nr_cpu_ids) - continue; - /* - * TODO: migrate context once core races on event->ctx have - * been fixed. - */ - cpumask_set_cpu(target, &cci_pmu->cpus); - } - mutex_unlock(&cci_pmu_mutex); + if (!cpumask_test_and_clear_cpu(cpu, &cci_pmu->cpus)) + return 0; + target = cpumask_any_but(cpu_online_mask, cpu); + if (target >= nr_cpu_ids) + return 0; + /* + * TODO: migrate context once core races on event->ctx have + * been fixed. + */ + cpumask_set_cpu(target, &cci_pmu->cpus); return 0; } @@ -1768,10 +1761,8 @@ static int cci_pmu_probe(struct platform_device *pdev) if (ret) return ret; - mutex_lock(&cci_pmu_mutex); - list_add(&cci_pmu->entry, &cci_pmu_list); - mutex_unlock(&cci_pmu_mutex); - + cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCI_ONLINE, + &cci_pmu->node); pr_info("ARM %s PMU driver probed", cci_pmu->model->name); return 0; } @@ -1804,9 +1795,9 @@ static int __init cci_platform_init(void) { int ret; - ret = cpuhp_setup_state_nocalls(CPUHP_AP_PERF_ARM_CCI_ONLINE, - "AP_PERF_ARM_CCI_ONLINE", NULL, - cci_pmu_offline_cpu); + ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CCI_ONLINE, + "AP_PERF_ARM_CCI_ONLINE", NULL, + cci_pmu_offline_cpu); if (ret) return ret; -- 2.20.1