Commit 66aa8d6a authored by Vinayak Kale's avatar Vinayak Kale Committed by Catalin Marinas

arm64: perf: add support for percpu pmu interrupt

Add support for irq registration when pmu interrupt is percpu.
Signed-off-by: default avatarVinayak Kale <vkale@apm.com>
Signed-off-by: default avatarTuan Phan <tphan@apm.com>
[will: tidied up cross-calling to pass &irq]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 7f4a8e7b
......@@ -22,6 +22,7 @@
#include <linux/bitmap.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/perf_event.h>
......@@ -362,27 +363,54 @@ validate_group(struct perf_event *event)
return 0;
}
static void
armpmu_disable_percpu_irq(void *data)
{
unsigned int irq = *(unsigned int *)data;
disable_percpu_irq(irq);
}
static void
armpmu_release_hardware(struct arm_pmu *armpmu)
{
int i, irq, irqs;
int irq;
unsigned int i, irqs;
struct platform_device *pmu_device = armpmu->plat_device;
irqs = min(pmu_device->num_resources, num_possible_cpus());
if (!irqs)
return;
irq = platform_get_irq(pmu_device, 0);
if (irq <= 0)
return;
if (irq_is_percpu(irq)) {
on_each_cpu(armpmu_disable_percpu_irq, &irq, 1);
free_percpu_irq(irq, &cpu_hw_events);
} else {
for (i = 0; i < irqs; ++i) {
if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs))
continue;
irq = platform_get_irq(pmu_device, i);
if (irq >= 0)
if (irq > 0)
free_irq(irq, armpmu);
}
}
}
static void
armpmu_enable_percpu_irq(void *data)
{
unsigned int irq = *(unsigned int *)data;
enable_percpu_irq(irq, IRQ_TYPE_NONE);
}
static int
armpmu_reserve_hardware(struct arm_pmu *armpmu)
{
int i, err, irq, irqs;
int err, irq;
unsigned int i, irqs;
struct platform_device *pmu_device = armpmu->plat_device;
if (!pmu_device) {
......@@ -391,15 +419,34 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
}
irqs = min(pmu_device->num_resources, num_possible_cpus());
if (irqs < 1) {
if (!irqs) {
pr_err("no irqs for PMUs defined\n");
return -ENODEV;
}
irq = platform_get_irq(pmu_device, 0);
if (irq <= 0) {
pr_err("failed to get valid irq for PMU device\n");
return -ENODEV;
}
if (irq_is_percpu(irq)) {
err = request_percpu_irq(irq, armpmu->handle_irq,
"arm-pmu", &cpu_hw_events);
if (err) {
pr_err("unable to request percpu IRQ%d for ARM PMU counters\n",
irq);
armpmu_release_hardware(armpmu);
return err;
}
on_each_cpu(armpmu_enable_percpu_irq, &irq, 1);
} else {
for (i = 0; i < irqs; ++i) {
err = 0;
irq = platform_get_irq(pmu_device, i);
if (irq < 0)
if (irq <= 0)
continue;
/*
......@@ -425,6 +472,7 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
cpumask_set_cpu(i, &armpmu->active_irqs);
}
}
return 0;
}
......
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