Messages in this thread | | | Date | Fri, 08 Nov 2013 17:04:27 -0800 | From | Stephen Boyd <> | Subject | Re: [PATCH 2/2] arm64: perf: add support for percpu pmu interrupt |
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Just some pointer casting nits.
On 11/06/13 04:07, Vinayak Kale wrote: > 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> > --- > arch/arm64/kernel/perf_event.c | 109 +++++++++++++++++++++++++++++----------- > 1 file changed, 81 insertions(+), 28 deletions(-) > > diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c > index cea1594..e60dae3 100644 > --- a/arch/arm64/kernel/perf_event.c > +++ b/arch/arm64/kernel/perf_event.c > @@ -44,6 +44,7 @@ > static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events); > static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask); > static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events); > +static bool is_percpuirq; > > #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) > > @@ -363,22 +364,51 @@ validate_group(struct perf_event *event) > } > > static void > +armpmu_disable_percpu_irq(void *data) > +{ > + struct arm_pmu *armpmu = (struct arm_pmu *)data;
Useless cast from void *.
> + struct platform_device *pmu_device = armpmu->plat_device; > + int irq = platform_get_irq(pmu_device, 0); > + > + cpumask_test_and_clear_cpu(smp_processor_id(), &armpmu->active_irqs); > + disable_percpu_irq(irq); > +} > + [...] > > +static void > +armpmu_enable_percpu_irq(void *data) > +{ > + struct arm_pmu *armpmu = (struct arm_pmu *)data;
Here too.
> + struct platform_device *pmu_device = armpmu->plat_device; > + int irq = platform_get_irq(pmu_device, 0); > + > + enable_percpu_irq(irq, 0); > + cpumask_set_cpu(smp_processor_id(), &armpmu->active_irqs); > +} > + > static int > armpmu_reserve_hardware(struct arm_pmu *armpmu) > { > @@ -396,34 +426,57 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu) > return -ENODEV; > } > > - for (i = 0; i < irqs; ++i) { > - err = 0; > - irq = platform_get_irq(pmu_device, i); > - if (irq < 0) > - continue; > + irq = platform_get_irq(pmu_device, 0); > > - /* > - * 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; > - } > + /* > + * Try 'request_percpu_irq' first. If it's return value indicates > + * that irq is not percpu then try 'request_irq' > + */ > + err = request_percpu_irq(irq, armpmu->handle_irq, > + "arm-pmu", &cpu_hw_events); > + if (err != -EPERM) { > + is_percpuirq = true; > > - 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); > + pr_err("unable to request percpu IRQ%d for ARM PMU counters\n", > + irq); > armpmu_release_hardware(armpmu); > return err; > } > > - cpumask_set_cpu(i, &armpmu->active_irqs); > + on_each_cpu(armpmu_enable_percpu_irq, (void *)armpmu, 1);
Looks like a useless cast to void * here.
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