From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752776AbaAORzv (ORCPT ); Wed, 15 Jan 2014 12:55:51 -0500 Received: from smtp.codeaurora.org ([198.145.11.231]:44879 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752643AbaAORzj (ORCPT ); Wed, 15 Jan 2014 12:55:39 -0500 From: Stephen Boyd To: Will Deacon Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 1/7] ARM: perf_event: Support percpu irqs for the CPU PMU Date: Wed, 15 Jan 2014 09:55:29 -0800 Message-Id: <1389808535-23852-2-git-send-email-sboyd@codeaurora.org> X-Mailer: git-send-email 1.8.5.2.228.g8f9f19c In-Reply-To: <1389808535-23852-1-git-send-email-sboyd@codeaurora.org> References: <1389808535-23852-1-git-send-email-sboyd@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some CPU PMUs are wired up with one PPI for all the CPUs instead of with a different SPI for each CPU. Add support for these devices. Signed-off-by: Stephen Boyd --- arch/arm/kernel/perf_event.c | 14 ++++-- arch/arm/kernel/perf_event_cpu.c | 97 ++++++++++++++++++++++++++++------------ 2 files changed, 80 insertions(+), 31 deletions(-) diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 789d846a9184..e76750980b38 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include #include #include @@ -295,9 +297,15 @@ validate_group(struct perf_event *event) 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); + struct arm_pmu *armpmu; + struct platform_device *plat_device; + struct arm_pmu_platdata *plat; + + if (irq_is_percpu(irq)) + dev = *(struct arm_pmu_cpu **)dev; + armpmu = dev; + plat_device = armpmu->plat_device; + plat = dev_get_platdata(&plat_device->dev); if (plat && plat->handle_irq) return plat->handle_irq(irq, dev, armpmu->handle_irq); diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c index 20d553c9f5e2..6efd8aab15df 100644 --- a/arch/arm/kernel/perf_event_cpu.c +++ b/arch/arm/kernel/perf_event_cpu.c @@ -25,6 +25,8 @@ #include #include #include +#include +#include #include #include @@ -33,6 +35,7 @@ /* Set at runtime when we know what CPU type we are. */ static struct arm_pmu *cpu_pmu; +static DEFINE_PER_CPU(struct arm_pmu *, percpu_pmu); 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); @@ -71,6 +74,26 @@ static struct pmu_hw_events *cpu_pmu_get_cpu_events(void) return this_cpu_ptr(&cpu_hw_events); } +static void cpu_pmu_enable_percpu_irq(void *data) +{ + struct arm_pmu *cpu_pmu = data; + struct platform_device *pmu_device = cpu_pmu->plat_device; + int irq = platform_get_irq(pmu_device, 0); + + enable_percpu_irq(irq, IRQ_TYPE_NONE); + cpumask_set_cpu(smp_processor_id(), &cpu_pmu->active_irqs); +} + +static void cpu_pmu_disable_percpu_irq(void *data) +{ + struct arm_pmu *cpu_pmu = data; + struct platform_device *pmu_device = cpu_pmu->plat_device; + int irq = platform_get_irq(pmu_device, 0); + + cpumask_clear_cpu(smp_processor_id(), &cpu_pmu->active_irqs); + disable_percpu_irq(irq); +} + static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu) { int i, irq, irqs; @@ -78,12 +101,18 @@ static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu) 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); + irq = platform_get_irq(pmu_device, 0); + if (irq >= 0 && irq_is_percpu(irq)) { + on_each_cpu(cpu_pmu_disable_percpu_irq, cpu_pmu, 1); + free_percpu_irq(irq, &percpu_pmu); + } else { + 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); + } } } @@ -101,33 +130,44 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler) 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 | IRQF_NO_THREAD, "arm-pmu", - cpu_pmu); + irq = platform_get_irq(pmu_device, 0); + if (irq >= 0 && irq_is_percpu(irq)) { + err = request_percpu_irq(irq, handler, "arm-pmu", &percpu_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); + on_each_cpu(cpu_pmu_enable_percpu_irq, cpu_pmu, 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, handler, + IRQF_NOBALANCING | IRQF_NO_THREAD, "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; @@ -141,6 +181,7 @@ static void cpu_pmu_init(struct arm_pmu *cpu_pmu) events->events = per_cpu(hw_events, cpu); events->used_mask = per_cpu(used_mask, cpu); raw_spin_lock_init(&events->pmu_lock); + per_cpu(percpu_pmu, cpu) = cpu_pmu; } cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation