From 4f089678d071781851c3b73c41e55a3765b6a5ee Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 22 Feb 2016 22:19:09 +0000 Subject: [PATCH] perf/x86/intel/uncore: Fix error handling This driver lacks any form of proper error handling. If initialization fails or hotplug prepare fails, it lets the facility with half initialized stuff around. Fix the state and memory leaks in a first step. As a second step we need to undo the hardware state which is set via uncore_box_init() on some of the uncore implementations. Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Cc: Andi Kleen Cc: Arnaldo Carvalho de Melo Cc: Borislav Petkov Cc: Harish Chegondi Cc: Jacob Pan Cc: Jiri Olsa Cc: Kan Liang Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Vince Weaver Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/20160222221010.848880559@linutronix.de Signed-off-by: Ingo Molnar --- arch/x86/events/intel/uncore.c | 122 +++++++++++++++++++++++---------- arch/x86/events/intel/uncore.h | 15 ++-- 2 files changed, 94 insertions(+), 43 deletions(-) diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c index 91facdc22d18..25e62037563e 100644 --- a/arch/x86/events/intel/uncore.c +++ b/arch/x86/events/intel/uncore.c @@ -38,6 +38,16 @@ int uncore_pcibus_to_physid(struct pci_bus *bus) return phys_id; } +static void uncore_free_pcibus_map(void) +{ + struct pci2phy_map *map, *tmp; + + list_for_each_entry_safe(map, tmp, &pci2phy_map_head, list) { + list_del(&map->list); + kfree(map); + } +} + struct pci2phy_map *__find_pci2phy_map(int segment) { struct pci2phy_map *map, *alloc = NULL; @@ -760,16 +770,28 @@ static int uncore_pmu_register(struct intel_uncore_pmu *pmu) } ret = perf_pmu_register(&pmu->pmu, pmu->name, -1); + if (!ret) + pmu->registered = true; return ret; } +static void uncore_pmu_unregister(struct intel_uncore_pmu *pmu) +{ + if (!pmu->registered) + return; + perf_pmu_unregister(&pmu->pmu); + pmu->registered = false; +} + static void __init uncore_type_exit(struct intel_uncore_type *type) { int i; if (type->pmus) { - for (i = 0; i < type->num_boxes; i++) + for (i = 0; i < type->num_boxes; i++) { + uncore_pmu_unregister(&type->pmus[i]); free_percpu(type->pmus[i].box); + } kfree(type->pmus); type->pmus = NULL; } @@ -856,8 +878,8 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id struct intel_uncore_pmu *pmu; struct intel_uncore_box *box; struct intel_uncore_type *type; - int phys_id; bool first_box = false; + int phys_id, ret; phys_id = uncore_pcibus_to_physid(pdev->bus); if (phys_id < 0) @@ -906,9 +928,18 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id list_add_tail(&box->list, &pmu->box_list); raw_spin_unlock(&uncore_box_lock); - if (first_box) - uncore_pmu_register(pmu); - return 0; + if (!first_box) + return 0; + + ret = uncore_pmu_register(pmu); + if (ret) { + pci_set_drvdata(pdev, NULL); + raw_spin_lock(&uncore_box_lock); + list_del(&box->list); + raw_spin_unlock(&uncore_box_lock); + kfree(box); + } + return ret; } static void uncore_pci_remove(struct pci_dev *pdev) @@ -954,7 +985,7 @@ static void uncore_pci_remove(struct pci_dev *pdev) kfree(box); if (last_box) - perf_pmu_unregister(&pmu->pmu); + uncore_pmu_unregister(pmu); } static int __init uncore_pci_init(void) @@ -1018,6 +1049,7 @@ static int __init uncore_pci_init(void) err: uncore_types_exit(uncore_pci_uncores); uncore_pci_uncores = empty_uncore; + uncore_free_pcibus_map(); return ret; } @@ -1027,6 +1059,7 @@ static void __init uncore_pci_exit(void) pcidrv_registered = false; pci_unregister_driver(uncore_pci_driver); uncore_types_exit(uncore_pci_uncores); + uncore_free_pcibus_map(); } } @@ -1223,8 +1256,7 @@ static int uncore_cpu_notifier(struct notifier_block *self, /* allocate/free data structure for uncore box */ switch (action & ~CPU_TASKS_FROZEN) { case CPU_UP_PREPARE: - uncore_cpu_prepare(cpu, -1); - break; + return notifier_from_errno(uncore_cpu_prepare(cpu, -1)); case CPU_STARTING: uncore_cpu_starting(cpu); break; @@ -1265,9 +1297,29 @@ static struct notifier_block uncore_cpu_nb = { .priority = CPU_PRI_PERF + 1, }; -static void __init uncore_cpu_setup(void *dummy) +static int __init type_pmu_register(struct intel_uncore_type *type) { - uncore_cpu_starting(smp_processor_id()); + int i, ret; + + for (i = 0; i < type->num_boxes; i++) { + ret = uncore_pmu_register(&type->pmus[i]); + if (ret) + return ret; + } + return 0; +} + +static int __init uncore_msr_pmus_register(void) +{ + struct intel_uncore_type **types = uncore_msr_uncores; + int ret; + + while (*types) { + ret = type_pmu_register(*types++); + if (ret) + return ret; + } + return 0; } static int __init uncore_cpu_init(void) @@ -1315,6 +1367,10 @@ static int __init uncore_cpu_init(void) } ret = uncore_types_init(uncore_msr_uncores); + if (ret) + goto err; + + ret = uncore_msr_pmus_register(); if (ret) goto err; return 0; @@ -1324,26 +1380,14 @@ err: return ret; } -static int __init uncore_pmus_register(void) +static void __init uncore_cpu_setup(void *dummy) { - struct intel_uncore_pmu *pmu; - struct intel_uncore_type *type; - int i, j; - - for (i = 0; uncore_msr_uncores[i]; i++) { - type = uncore_msr_uncores[i]; - for (j = 0; j < type->num_boxes; j++) { - pmu = &type->pmus[j]; - uncore_pmu_register(pmu); - } - } - - return 0; + uncore_cpu_starting(smp_processor_id()); } -static void __init uncore_cpumask_init(void) +static int __init uncore_cpumask_init(void) { - int cpu; + int cpu, ret = 0; cpu_notifier_register_begin(); @@ -1359,17 +1403,20 @@ static void __init uncore_cpumask_init(void) if (phys_id < 0) continue; - uncore_cpu_prepare(cpu, phys_id); + ret = uncore_cpu_prepare(cpu, phys_id); + if (ret) + goto out; uncore_event_init_cpu(cpu); } on_each_cpu(uncore_cpu_setup, NULL, 1); __register_cpu_notifier(&uncore_cpu_nb); +out: cpu_notifier_register_done(); + return ret; } - static int __init intel_uncore_init(void) { int ret; @@ -1382,17 +1429,20 @@ static int __init intel_uncore_init(void) ret = uncore_pci_init(); if (ret) - goto fail; + return ret; ret = uncore_cpu_init(); - if (ret) { - uncore_pci_exit(); - goto fail; - } - uncore_cpumask_init(); + if (ret) + goto errpci; + ret = uncore_cpumask_init(); + if (ret) + goto errcpu; - uncore_pmus_register(); return 0; -fail: + +errcpu: + uncore_types_exit(uncore_msr_uncores); +errpci: + uncore_pci_exit(); return ret; } device_initcall(intel_uncore_init); diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h index 6a1340c7f3cc..a18cc7f5e5a2 100644 --- a/arch/x86/events/intel/uncore.h +++ b/arch/x86/events/intel/uncore.h @@ -73,13 +73,14 @@ struct intel_uncore_ops { }; struct intel_uncore_pmu { - struct pmu pmu; - char name[UNCORE_PMU_NAME_LEN]; - int pmu_idx; - int func_id; - struct intel_uncore_type *type; - struct intel_uncore_box ** __percpu box; - struct list_head box_list; + struct pmu pmu; + char name[UNCORE_PMU_NAME_LEN]; + int pmu_idx; + int func_id; + bool registered; + struct intel_uncore_type *type; + struct intel_uncore_box ** __percpu box; + struct list_head box_list; }; struct intel_uncore_extra_reg {