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authorMark Rutland <mark.rutland@arm.com>2017-04-11 11:39:51 +0300
committerWill Deacon <will.deacon@arm.com>2017-04-11 18:29:53 +0300
commit0e2663d921ea1861540cd7f331d8e2c7668aa31f (patch)
treec3cd5bba53d72874786b7d7866a91ee6750c76bb /drivers/perf
parent3cf6111025cb3346be43856e4c5e9b795b447832 (diff)
downloadlinux-0e2663d921ea1861540cd7f331d8e2c7668aa31f.tar.xz
drivers/perf: arm_pmu: split cpu-local irq request/free
Currently we have functions to request/free all IRQs for a given PMU. While this works today, this won't work for ACPI, where we don't know the full set of IRQs up front, and need to request them separately. To enable supporting ACPI, this patch splits out the cpu-local request/free into new functions, allowing us to request/free individual IRQs. As this makes it possible/necessary to request a PPI once per cpu, an additional check is added to detect mismatched PPIs. This shouldn't matter for the DT / platform case, as we check this when parsing. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm_pmu.c88
1 files changed, 52 insertions, 36 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 3c4e97df8331..c09c379b038d 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -527,65 +527,81 @@ int perf_num_counters(void)
}
EXPORT_SYMBOL_GPL(perf_num_counters);
-static void armpmu_free_irqs(struct arm_pmu *armpmu)
+static void armpmu_free_irq(struct arm_pmu *armpmu, int cpu)
{
- int cpu;
struct pmu_hw_events __percpu *hw_events = armpmu->hw_events;
+ int irq = per_cpu(hw_events->irq, cpu);
- for_each_cpu(cpu, &armpmu->supported_cpus) {
- int irq = per_cpu(hw_events->irq, cpu);
- if (!irq)
- continue;
+ if (!cpumask_test_and_clear_cpu(cpu, &armpmu->active_irqs))
+ return;
- if (irq_is_percpu(irq)) {
- free_percpu_irq(irq, &hw_events->percpu_pmu);
- break;
- }
+ if (irq_is_percpu(irq)) {
+ free_percpu_irq(irq, &hw_events->percpu_pmu);
+ cpumask_clear(&armpmu->active_irqs);
+ return;
+ }
- if (!cpumask_test_and_clear_cpu(cpu, &armpmu->active_irqs))
- continue;
+ free_irq(irq, per_cpu_ptr(&hw_events->percpu_pmu, cpu));
+}
- free_irq(irq, per_cpu_ptr(&hw_events->percpu_pmu, cpu));
- }
+static void armpmu_free_irqs(struct arm_pmu *armpmu)
+{
+ int cpu;
+
+ for_each_cpu(cpu, &armpmu->supported_cpus)
+ armpmu_free_irq(armpmu, cpu);
}
-static int armpmu_request_irqs(struct arm_pmu *armpmu)
+static int armpmu_request_irq(struct arm_pmu *armpmu, int cpu)
{
- int cpu, err;
+ int err = 0;
struct pmu_hw_events __percpu *hw_events = armpmu->hw_events;
const irq_handler_t handler = armpmu_dispatch_irq;
+ int irq = per_cpu(hw_events->irq, cpu);
+ if (!irq)
+ return 0;
- for_each_cpu(cpu, &armpmu->supported_cpus) {
- int irq = per_cpu(hw_events->irq, cpu);
- if (!irq)
- continue;
+ if (irq_is_percpu(irq) && cpumask_empty(&armpmu->active_irqs)) {
+ err = request_percpu_irq(irq, handler, "arm-pmu",
+ &hw_events->percpu_pmu);
+ } else if (irq_is_percpu(irq)) {
+ int other_cpu = cpumask_first(&armpmu->active_irqs);
+ int other_irq = per_cpu(hw_events->irq, other_cpu);
- if (irq_is_percpu(irq)) {
- err = request_percpu_irq(irq, handler, "arm-pmu",
- &hw_events->percpu_pmu);
- if (err) {
- pr_err("unable to request IRQ%d for ARM PMU counters\n",
- irq);
- }
-
- return err;
+ if (irq != other_irq) {
+ pr_warn("mismatched PPIs detected.\n");
+ err = -EINVAL;
}
-
+ } else {
err = request_irq(irq, handler,
IRQF_NOBALANCING | IRQF_NO_THREAD, "arm-pmu",
per_cpu_ptr(&hw_events->percpu_pmu, cpu));
- if (err) {
- pr_err("unable to request IRQ%d for ARM PMU counters\n",
- irq);
- return err;
- }
+ }
- cpumask_set_cpu(cpu, &armpmu->active_irqs);
+ if (err) {
+ pr_err("unable to request IRQ%d for ARM PMU counters\n",
+ irq);
+ return err;
}
+ cpumask_set_cpu(cpu, &armpmu->active_irqs);
+
return 0;
}
+static int armpmu_request_irqs(struct arm_pmu *armpmu)
+{
+ int cpu, err;
+
+ for_each_cpu(cpu, &armpmu->supported_cpus) {
+ err = armpmu_request_irq(armpmu, cpu);
+ if (err)
+ break;
+ }
+
+ return err;
+}
+
static int armpmu_get_cpu_irq(struct arm_pmu *pmu, int cpu)
{
struct pmu_hw_events __percpu *hw_events = pmu->hw_events;