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Groups > linux.kernel > #1336453

[patch 03/11] x86/perf/intel_uncore: Fix error handling

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject [patch 03/11] x86/perf/intel_uncore: Fix error handling
Date 2016-02-17 15:00 +0100
Message-ID <r3aO7-7aS-39@gated-at.bofh.it> (permalink)
References <r3aEq-770-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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 <tglx@linutronix.de>
---
 arch/x86/kernel/cpu/perf_event_intel_uncore.c |  110 +++++++++++++++++---------
 arch/x86/kernel/cpu/perf_event_intel_uncore.h |   15 +--
 2 files changed, 82 insertions(+), 43 deletions(-)

--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -760,16 +760,28 @@ static int uncore_pmu_register(struct in
 	}
 
 	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 +868,8 @@ static int uncore_pci_probe(struct pci_d
 	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 +918,18 @@ static int uncore_pci_probe(struct pci_d
 	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 +975,7 @@ static void uncore_pci_remove(struct pci
 	kfree(box);
 
 	if (last_box)
-		perf_pmu_unregister(&pmu->pmu);
+		uncore_pmu_unregister(pmu);
 }
 
 static int __init uncore_pci_init(void)
@@ -1223,8 +1244,7 @@ static int uncore_cpu_notifier(struct no
 	/* 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 +1285,29 @@ static struct notifier_block uncore_cpu_
 	.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)
@@ -1317,6 +1357,10 @@ 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;
 err:
 	uncore_types_exit(uncore_msr_uncores);
@@ -1324,26 +1368,14 @@ static int __init uncore_cpu_init(void)
 	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 +1391,20 @@ static void __init uncore_cpumask_init(v
 		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 +1417,20 @@ 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);
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.h
+++ b/arch/x86/kernel/cpu/perf_event_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 {

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Thread

[patch 00/11] x86/perf/intel_uncore: Cleanup and enhancements Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 14:50 +0100
  [patch 05/11] x86/perf/intel_uncore: Make code readable Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 01/11] x86/perf/intel_uncore: Remove pointless mask check Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 02/11] x86/perf/intel_uncore: Simplify error rollback Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 09/11] x86/perf/intel_uncore: Make PCI and MSR uncore  independent Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 06/11] x86/topology: Provide helper to retrieve number of cpu  packages Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 03/11] x86/perf/intel_uncore: Fix error handling Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 11/11] x86/perf/intel_uncore: Make it modular Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 10/11] cpumask: Export cpumask_any_but Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
  [patch 04/11] x86/perf/intel_uncore: Cleanup hardware on exit Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 15:00 +0100
    RE: [patch 04/11] x86/perf/intel_uncore: Cleanup hardware on exit "Liang, Kan" <kan.liang@intel.com> - 2016-02-17 16:50 +0100
      RE: [patch 04/11] x86/perf/intel_uncore: Cleanup hardware on exit Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 19:20 +0100
        RE: [patch 04/11] x86/perf/intel_uncore: Cleanup hardware on exit "Liang, Kan" <kan.liang@intel.com> - 2016-02-17 23:00 +0100
          RE: [patch 04/11] x86/perf/intel_uncore: Cleanup hardware on exit Thomas Gleixner <tglx@linutronix.de> - 2016-02-17 23:10 +0100

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