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ARM: perf: move irq registration into pmu implementation

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This patch moves the CPU-specific IRQ registration and parsing code into
the CPU PMU backend. This is required because a PMU may have more than
one interrupt, which in turn can be either PPI (per-cpu) or SPI
(requiring strict affinity setting at the interrupt distributor).

Signed-off-by: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>
[will: cosmetic edits and reworked interrupt dispatching]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Sudeep KarkadaNagesha 2012-07-31 10:34:25 +01:00 committed by Will Deacon
parent 5505b206ca
commit 051f1b1314
3 changed files with 79 additions and 61 deletions
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2
arch/arm/include/asm/pmu.h
View File

@ -78,6 +78,8 @@ struct arm_pmu {
void (*start)(void);
void (*stop)(void);
void (*reset)(void *);
int (*request_irq)(irq_handler_t handler);
void (*free_irq)(void);
int (*map_event)(struct perf_event *event);
int num_events;
atomic_t active_events;

72
arch/arm/kernel/perf_event.c
View File

@ -297,87 +297,39 @@ validate_group(struct perf_event *event)
return 0;
}
static irqreturn_t armpmu_platform_irq(int irq, void *dev)
static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
{
struct arm_pmu *armpmu = (struct arm_pmu *) dev;
struct platform_device *plat_device = armpmu->plat_device;
struct arm_pmu_platdata *plat = dev_get_platdata(&plat_device->dev);
return plat->handle_irq(irq, dev, armpmu->handle_irq);
if (plat && plat->handle_irq)
return plat->handle_irq(irq, dev, armpmu->handle_irq);
else
return armpmu->handle_irq(irq, dev);
}
static void
armpmu_release_hardware(struct arm_pmu *armpmu)
{
int i, irq, irqs;
struct platform_device *pmu_device = armpmu->plat_device;
irqs = min(pmu_device->num_resources, num_possible_cpus());
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);
}
pm_runtime_put_sync(&pmu_device->dev);
armpmu->free_irq();
pm_runtime_put_sync(&armpmu->plat_device->dev);
}
static int
armpmu_reserve_hardware(struct arm_pmu *armpmu)
{
struct arm_pmu_platdata *plat;
irq_handler_t handle_irq;
int i, err, irq, irqs;
int err;
struct platform_device *pmu_device = armpmu->plat_device;
if (!pmu_device)
return -ENODEV;
plat = dev_get_platdata(&pmu_device->dev);
if (plat && plat->handle_irq)
handle_irq = armpmu_platform_irq;
else
handle_irq = armpmu->handle_irq;
irqs = min(pmu_device->num_resources, num_possible_cpus());
if (irqs < 1) {
pr_err("no irqs for PMUs defined\n");
return -ENODEV;
}
pm_runtime_get_sync(&pmu_device->dev);
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, handle_irq,
IRQF_DISABLED | 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);
err = armpmu->request_irq(armpmu_dispatch_irq);
if (err) {
armpmu_release_hardware(armpmu);
return err;
}
return 0;

66
arch/arm/kernel/perf_event_cpu.c
View File

@ -70,6 +70,67 @@ static struct pmu_hw_events *cpu_pmu_get_cpu_events(void)
return &__get_cpu_var(cpu_hw_events);
}
static void cpu_pmu_free_irq(void)
{
int i, irq, irqs;
struct platform_device *pmu_device = cpu_pmu->plat_device;
irqs = min(pmu_device->num_resources, num_possible_cpus());
for (i = 0; i < irqs; ++i) {
if (!cpumask_test_and_clear_cpu(i, &cpu_pmu->active_irqs))
continue;
irq = platform_get_irq(pmu_device, i);
if (irq >= 0)
free_irq(irq, cpu_pmu);
}
}
static int cpu_pmu_request_irq(irq_handler_t handler)
{
int i, err, irq, irqs;
struct platform_device *pmu_device = cpu_pmu->plat_device;
if (!pmu_device)
return -ENODEV;
irqs = min(pmu_device->num_resources, num_possible_cpus());
if (irqs < 1) {
pr_err("no irqs for PMUs defined\n");
return -ENODEV;
}
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, handler, IRQF_NOBALANCING, "arm-pmu",
cpu_pmu);
if (err) {
pr_err("unable to request IRQ%d for ARM PMU counters\n",
irq);
return err;
}
cpumask_set_cpu(i, &cpu_pmu->active_irqs);
}
return 0;
}
static void __devinit cpu_pmu_init(struct arm_pmu *cpu_pmu)
{
int cpu;
@ -79,7 +140,10 @@ static void __devinit cpu_pmu_init(struct arm_pmu *cpu_pmu)
events->used_mask = per_cpu(used_mask, cpu);
raw_spin_lock_init(&events->pmu_lock);
}
cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events;
cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events;
cpu_pmu->request_irq = cpu_pmu_request_irq;
cpu_pmu->free_irq = cpu_pmu_free_irq;
/* Ensure the PMU has sane values out of reset. */
if (cpu_pmu && cpu_pmu->reset)