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path: root/drivers/perf/arm_pmu.c
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Diffstat (limited to 'drivers/perf/arm_pmu.c')
-rw-r--r--drivers/perf/arm_pmu.c90
1 files changed, 74 insertions, 16 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index df352b334ea7..a770726e98d4 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -26,8 +26,46 @@
#include <asm/irq_regs.h>
+static int armpmu_count_irq_users(const int irq);
+
+struct pmu_irq_ops {
+ void (*enable_pmuirq)(unsigned int irq);
+ void (*disable_pmuirq)(unsigned int irq);
+ void (*free_pmuirq)(unsigned int irq, int cpu, void __percpu *devid);
+};
+
+static void armpmu_free_pmuirq(unsigned int irq, int cpu, void __percpu *devid)
+{
+ free_irq(irq, per_cpu_ptr(devid, cpu));
+}
+
+static const struct pmu_irq_ops pmuirq_ops = {
+ .enable_pmuirq = enable_irq,
+ .disable_pmuirq = disable_irq_nosync,
+ .free_pmuirq = armpmu_free_pmuirq
+};
+
+static void armpmu_enable_percpu_pmuirq(unsigned int irq)
+{
+ enable_percpu_irq(irq, IRQ_TYPE_NONE);
+}
+
+static void armpmu_free_percpu_pmuirq(unsigned int irq, int cpu,
+ void __percpu *devid)
+{
+ if (armpmu_count_irq_users(irq) == 1)
+ free_percpu_irq(irq, devid);
+}
+
+static const struct pmu_irq_ops percpu_pmuirq_ops = {
+ .enable_pmuirq = armpmu_enable_percpu_pmuirq,
+ .disable_pmuirq = disable_percpu_irq,
+ .free_pmuirq = armpmu_free_percpu_pmuirq
+};
+
static DEFINE_PER_CPU(struct arm_pmu *, cpu_armpmu);
static DEFINE_PER_CPU(int, cpu_irq);
+static DEFINE_PER_CPU(const struct pmu_irq_ops *, cpu_irq_ops);
static inline u64 arm_pmu_event_max_period(struct perf_event *event)
{
@@ -544,6 +582,23 @@ static int armpmu_count_irq_users(const int irq)
return count;
}
+static const struct pmu_irq_ops *armpmu_find_irq_ops(int irq)
+{
+ const struct pmu_irq_ops *ops = NULL;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ if (per_cpu(cpu_irq, cpu) != irq)
+ continue;
+
+ ops = per_cpu(cpu_irq_ops, cpu);
+ if (ops)
+ break;
+ }
+
+ return ops;
+}
+
void armpmu_free_irq(int irq, int cpu)
{
if (per_cpu(cpu_irq, cpu) == 0)
@@ -551,18 +606,18 @@ void armpmu_free_irq(int irq, int cpu)
if (WARN_ON(irq != per_cpu(cpu_irq, cpu)))
return;
- if (!irq_is_percpu_devid(irq))
- free_irq(irq, per_cpu_ptr(&cpu_armpmu, cpu));
- else if (armpmu_count_irq_users(irq) == 1)
- free_percpu_irq(irq, &cpu_armpmu);
+ per_cpu(cpu_irq_ops, cpu)->free_pmuirq(irq, cpu, &cpu_armpmu);
per_cpu(cpu_irq, cpu) = 0;
+ per_cpu(cpu_irq_ops, cpu) = NULL;
}
int armpmu_request_irq(int irq, int cpu)
{
int err = 0;
const irq_handler_t handler = armpmu_dispatch_irq;
+ const struct pmu_irq_ops *irq_ops;
+
if (!irq)
return 0;
@@ -584,15 +639,26 @@ int armpmu_request_irq(int irq, int cpu)
irq_set_status_flags(irq, IRQ_NOAUTOEN);
err = request_irq(irq, handler, irq_flags, "arm-pmu",
per_cpu_ptr(&cpu_armpmu, cpu));
+
+ irq_ops = &pmuirq_ops;
} else if (armpmu_count_irq_users(irq) == 0) {
err = request_percpu_irq(irq, handler, "arm-pmu",
&cpu_armpmu);
+
+ irq_ops = &percpu_pmuirq_ops;
+ } else {
+ /* Per cpudevid irq was already requested by another CPU */
+ irq_ops = armpmu_find_irq_ops(irq);
+
+ if (WARN_ON(!irq_ops))
+ err = -EINVAL;
}
if (err)
goto err_out;
per_cpu(cpu_irq, cpu) = irq;
+ per_cpu(cpu_irq_ops, cpu) = irq_ops;
return 0;
err_out:
@@ -625,12 +691,8 @@ static int arm_perf_starting_cpu(unsigned int cpu, struct hlist_node *node)
per_cpu(cpu_armpmu, cpu) = pmu;
irq = armpmu_get_cpu_irq(pmu, cpu);
- if (irq) {
- if (irq_is_percpu_devid(irq))
- enable_percpu_irq(irq, IRQ_TYPE_NONE);
- else
- enable_irq(irq);
- }
+ if (irq)
+ per_cpu(cpu_irq_ops, cpu)->enable_pmuirq(irq);
return 0;
}
@@ -644,12 +706,8 @@ static int arm_perf_teardown_cpu(unsigned int cpu, struct hlist_node *node)
return 0;
irq = armpmu_get_cpu_irq(pmu, cpu);
- if (irq) {
- if (irq_is_percpu_devid(irq))
- disable_percpu_irq(irq);
- else
- disable_irq_nosync(irq);
- }
+ if (irq)
+ per_cpu(cpu_irq_ops, cpu)->disable_pmuirq(irq);
per_cpu(cpu_armpmu, cpu) = NULL;