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arm64: perf: add support for percpu pmu interrupt

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Add support for irq registration when pmu interrupt is percpu.

Signed-off-by: Vinayak Kale <vkale@apm.com>
Signed-off-by: Tuan Phan <tphan@apm.com>
[will: tidied up cross-calling to pass &irq]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Vinayak Kale 2013-12-04 10:09:51 +00:00 • committed by Catalin Marinas
parent 7f4a8e7b19
commit 66aa8d6a14
1 changed files with 78 additions and 30 deletions
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108
arch/arm64/kernel/perf_event.c
View file

@ -22,6 +22,7 @@
#include <linux/bitmap.h> #include <linux/bitmap.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/perf_event.h> #include <linux/perf_event.h>
@ -362,27 +363,54 @@ validate_group(struct perf_event *event)
return 0; return 0;
} }
static void
armpmu_disable_percpu_irq(void *data)
{
unsigned int irq = *(unsigned int *)data;
disable_percpu_irq(irq);
}
static void static void
armpmu_release_hardware(struct arm_pmu *armpmu) 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; struct platform_device *pmu_device = armpmu->plat_device;
irqs = min(pmu_device->num_resources, num_possible_cpus()); irqs = min(pmu_device->num_resources, num_possible_cpus());
if (!irqs)
return;
for (i = 0; i < irqs; ++i) { irq = platform_get_irq(pmu_device, 0);
if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs)) if (irq <= 0)
continue; return;
irq = platform_get_irq(pmu_device, i);
if (irq >= 0) if (irq_is_percpu(irq)) {
free_irq(irq, armpmu); 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)
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 static int
armpmu_reserve_hardware(struct arm_pmu *armpmu) 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; struct platform_device *pmu_device = armpmu->plat_device;
if (!pmu_device) { if (!pmu_device) {
@ -391,39 +419,59 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
} }
irqs = min(pmu_device->num_resources, num_possible_cpus()); irqs = min(pmu_device->num_resources, num_possible_cpus());
if (irqs < 1) { if (!irqs) {
pr_err("no irqs for PMUs defined\n"); pr_err("no irqs for PMUs defined\n");
return -ENODEV; return -ENODEV;
} }
for (i = 0; i < irqs; ++i) { irq = platform_get_irq(pmu_device, 0);
err = 0; if (irq <= 0) {
irq = platform_get_irq(pmu_device, i); pr_err("failed to get valid irq for PMU device\n");
if (irq < 0) return -ENODEV;
continue; }
/* if (irq_is_percpu(irq)) {
* If we have a single PMU interrupt that we can't shift, err = request_percpu_irq(irq, armpmu->handle_irq,
* assume that we're running on a uniprocessor machine and "arm-pmu", &cpu_hw_events);
* continue. Otherwise, continue without this interrupt.
*/
if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
irq, i);
continue;
}
err = request_irq(irq, armpmu->handle_irq,
IRQF_NOBALANCING,
"arm-pmu", armpmu);
if (err) { if (err) {
pr_err("unable to request IRQ%d for ARM PMU counters\n", pr_err("unable to request percpu IRQ%d for ARM PMU counters\n",
irq); irq);
armpmu_release_hardware(armpmu); armpmu_release_hardware(armpmu);
return err; return err;
} }
cpumask_set_cpu(i, &armpmu->active_irqs); 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)
continue;
/*
* If we have a single PMU interrupt that we can't shift,
* assume that we're running on a uniprocessor machine and
* continue. Otherwise, continue without this interrupt.
*/
if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
irq, i);
continue;
}
err = request_irq(irq, armpmu->handle_irq,
IRQF_NOBALANCING,
"arm-pmu", armpmu);
if (err) {
pr_err("unable to request IRQ%d for ARM PMU counters\n",
irq);
armpmu_release_hardware(armpmu);
return err;
}
cpumask_set_cpu(i, &armpmu->active_irqs);
}
} }
return 0; return 0;