drivers/perf: arm_pmu: split out platform device probe logic
Now that we've split the pdev and DT probing logic from the runtime management, let's move the former into its own file. We gain a few lines due to the copyright header and includes, but this should keep the logic clearly separated, and paves the way for adding ACPI support in a similar fashion. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Jeremy Linton <jeremy.linton@arm.com> [will: rename nr_irqs to avoid conflict with global variable] Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland
Will Deacon
parent
3cf7ee98b8
commit
18bfcfe51b
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@ -1,4 +1,4 @@
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obj-$(CONFIG_ARM_PMU) += arm_pmu.o
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obj-$(CONFIG_ARM_PMU) += arm_pmu.o arm_pmu_platform.o
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obj-$(CONFIG_QCOM_L2_PMU) += qcom_l2_pmu.o
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obj-$(CONFIG_QCOM_L3_PMU) += qcom_l3_pmu.o
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obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
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@ -16,7 +16,6 @@
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#include <linux/cpu_pm.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/of_device.h>
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#include <linux/perf/arm_pmu.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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@ -25,7 +24,6 @@
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#include <linux/irq.h>
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#include <linux/irqdesc.h>
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#include <asm/cputype.h>
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#include <asm/irq_regs.h>
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static int
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@ -544,7 +542,7 @@ static void armpmu_free_irq(struct arm_pmu *armpmu, int cpu)
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free_irq(irq, per_cpu_ptr(&hw_events->percpu_pmu, cpu));
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}
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static void armpmu_free_irqs(struct arm_pmu *armpmu)
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void armpmu_free_irqs(struct arm_pmu *armpmu)
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{
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int cpu;
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@ -589,7 +587,7 @@ static int armpmu_request_irq(struct arm_pmu *armpmu, int cpu)
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return 0;
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}
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static int armpmu_request_irqs(struct arm_pmu *armpmu)
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int armpmu_request_irqs(struct arm_pmu *armpmu)
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{
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int cpu, err;
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@ -783,161 +781,7 @@ static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu)
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&cpu_pmu->node);
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}
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/*
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* CPU PMU identification and probing.
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*/
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static int probe_current_pmu(struct arm_pmu *pmu,
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const struct pmu_probe_info *info)
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{
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int cpu = get_cpu();
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unsigned int cpuid = read_cpuid_id();
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int ret = -ENODEV;
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pr_info("probing PMU on CPU %d\n", cpu);
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for (; info->init != NULL; info++) {
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if ((cpuid & info->mask) != info->cpuid)
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continue;
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ret = info->init(pmu);
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break;
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}
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put_cpu();
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return ret;
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}
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static int pmu_parse_percpu_irq(struct arm_pmu *pmu, int irq)
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{
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int cpu, ret;
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struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
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ret = irq_get_percpu_devid_partition(irq, &pmu->supported_cpus);
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if (ret)
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return ret;
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for_each_cpu(cpu, &pmu->supported_cpus)
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per_cpu(hw_events->irq, cpu) = irq;
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return 0;
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}
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static bool pmu_has_irq_affinity(struct device_node *node)
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{
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return !!of_find_property(node, "interrupt-affinity", NULL);
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}
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static int pmu_parse_irq_affinity(struct device_node *node, int i)
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{
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struct device_node *dn;
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int cpu;
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/*
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* If we don't have an interrupt-affinity property, we guess irq
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* affinity matches our logical CPU order, as we used to assume.
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* This is fragile, so we'll warn in pmu_parse_irqs().
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*/
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if (!pmu_has_irq_affinity(node))
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return i;
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dn = of_parse_phandle(node, "interrupt-affinity", i);
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if (!dn) {
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pr_warn("failed to parse interrupt-affinity[%d] for %s\n",
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i, node->name);
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return -EINVAL;
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}
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/* Now look up the logical CPU number */
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for_each_possible_cpu(cpu) {
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struct device_node *cpu_dn;
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cpu_dn = of_cpu_device_node_get(cpu);
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of_node_put(cpu_dn);
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if (dn == cpu_dn)
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break;
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}
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if (cpu >= nr_cpu_ids) {
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pr_warn("failed to find logical CPU for %s\n", dn->name);
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}
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of_node_put(dn);
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return cpu;
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}
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static int pmu_parse_irqs(struct arm_pmu *pmu)
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{
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int i = 0, irqs;
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struct platform_device *pdev = pmu->plat_device;
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struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
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irqs = platform_irq_count(pdev);
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if (irqs < 0) {
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pr_err("unable to count PMU IRQs\n");
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return irqs;
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}
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/*
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* In this case we have no idea which CPUs are covered by the PMU.
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* To match our prior behaviour, we assume all CPUs in this case.
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*/
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if (irqs == 0) {
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pr_warn("no irqs for PMU, sampling events not supported\n");
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pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
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cpumask_setall(&pmu->supported_cpus);
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return 0;
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}
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if (irqs == 1) {
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int irq = platform_get_irq(pdev, 0);
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if (irq && irq_is_percpu(irq))
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return pmu_parse_percpu_irq(pmu, irq);
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}
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if (!pmu_has_irq_affinity(pdev->dev.of_node)) {
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pr_warn("no interrupt-affinity property for %s, guessing.\n",
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of_node_full_name(pdev->dev.of_node));
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}
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/*
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* Some platforms have all PMU IRQs OR'd into a single IRQ, with a
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* special platdata function that attempts to demux them.
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*/
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if (dev_get_platdata(&pdev->dev))
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cpumask_setall(&pmu->supported_cpus);
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for (i = 0; i < irqs; i++) {
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int cpu, irq;
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irq = platform_get_irq(pdev, i);
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if (WARN_ON(irq <= 0))
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continue;
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if (irq_is_percpu(irq)) {
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pr_warn("multiple PPIs or mismatched SPI/PPI detected\n");
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return -EINVAL;
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}
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cpu = pmu_parse_irq_affinity(pdev->dev.of_node, i);
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if (cpu < 0)
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return cpu;
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if (cpu >= nr_cpu_ids)
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continue;
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if (per_cpu(hw_events->irq, cpu)) {
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pr_warn("multiple PMU IRQs for the same CPU detected\n");
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return -EINVAL;
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}
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per_cpu(hw_events->irq, cpu) = irq;
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cpumask_set_cpu(cpu, &pmu->supported_cpus);
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}
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return 0;
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}
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static struct arm_pmu *armpmu_alloc(void)
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struct arm_pmu *armpmu_alloc(void)
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{
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struct arm_pmu *pmu;
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int cpu;
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@ -994,7 +838,7 @@ out:
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return NULL;
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}
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static void armpmu_free(struct arm_pmu *pmu)
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void armpmu_free(struct arm_pmu *pmu)
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{
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free_percpu(pmu->hw_events);
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kfree(pmu);
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@ -1025,68 +869,6 @@ out_destroy:
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return ret;
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}
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int arm_pmu_device_probe(struct platform_device *pdev,
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const struct of_device_id *of_table,
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const struct pmu_probe_info *probe_table)
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{
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const struct of_device_id *of_id;
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armpmu_init_fn init_fn;
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struct device_node *node = pdev->dev.of_node;
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struct arm_pmu *pmu;
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int ret = -ENODEV;
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pmu = armpmu_alloc();
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if (!pmu)
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return -ENOMEM;
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pmu->plat_device = pdev;
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ret = pmu_parse_irqs(pmu);
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if (ret)
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goto out_free;
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if (node && (of_id = of_match_node(of_table, pdev->dev.of_node))) {
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init_fn = of_id->data;
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pmu->secure_access = of_property_read_bool(pdev->dev.of_node,
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"secure-reg-access");
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/* arm64 systems boot only as non-secure */
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if (IS_ENABLED(CONFIG_ARM64) && pmu->secure_access) {
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pr_warn("ignoring \"secure-reg-access\" property for arm64\n");
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pmu->secure_access = false;
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}
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ret = init_fn(pmu);
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} else if (probe_table) {
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cpumask_setall(&pmu->supported_cpus);
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ret = probe_current_pmu(pmu, probe_table);
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}
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if (ret) {
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pr_info("%s: failed to probe PMU!\n", of_node_full_name(node));
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goto out_free;
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}
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ret = armpmu_request_irqs(pmu);
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if (ret)
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goto out_free_irqs;
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ret = armpmu_register(pmu);
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if (ret)
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goto out_free;
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return 0;
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out_free_irqs:
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armpmu_free_irqs(pmu);
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out_free:
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pr_info("%s: failed to register PMU devices!\n",
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of_node_full_name(node));
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armpmu_free(pmu);
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return ret;
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}
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static int arm_pmu_hp_init(void)
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{
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int ret;
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@ -0,0 +1,235 @@
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/*
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* platform_device probing code for ARM performance counters.
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*
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* Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
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* Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com>
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*/
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#define pr_fmt(fmt) "hw perfevents: " fmt
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#include <linux/bug.h>
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#include <linux/cpumask.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/irq.h>
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#include <linux/irqdesc.h>
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#include <linux/kconfig.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/percpu.h>
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#include <linux/perf/arm_pmu.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/smp.h>
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static int probe_current_pmu(struct arm_pmu *pmu,
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const struct pmu_probe_info *info)
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{
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int cpu = get_cpu();
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unsigned int cpuid = read_cpuid_id();
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int ret = -ENODEV;
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pr_info("probing PMU on CPU %d\n", cpu);
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for (; info->init != NULL; info++) {
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if ((cpuid & info->mask) != info->cpuid)
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continue;
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ret = info->init(pmu);
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break;
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}
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put_cpu();
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return ret;
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}
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static int pmu_parse_percpu_irq(struct arm_pmu *pmu, int irq)
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{
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int cpu, ret;
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struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
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ret = irq_get_percpu_devid_partition(irq, &pmu->supported_cpus);
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if (ret)
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return ret;
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for_each_cpu(cpu, &pmu->supported_cpus)
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per_cpu(hw_events->irq, cpu) = irq;
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return 0;
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}
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static bool pmu_has_irq_affinity(struct device_node *node)
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{
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return !!of_find_property(node, "interrupt-affinity", NULL);
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}
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static int pmu_parse_irq_affinity(struct device_node *node, int i)
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{
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struct device_node *dn;
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int cpu;
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/*
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* If we don't have an interrupt-affinity property, we guess irq
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* affinity matches our logical CPU order, as we used to assume.
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* This is fragile, so we'll warn in pmu_parse_irqs().
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*/
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if (!pmu_has_irq_affinity(node))
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return i;
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dn = of_parse_phandle(node, "interrupt-affinity", i);
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if (!dn) {
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pr_warn("failed to parse interrupt-affinity[%d] for %s\n",
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i, node->name);
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return -EINVAL;
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}
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/* Now look up the logical CPU number */
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for_each_possible_cpu(cpu) {
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struct device_node *cpu_dn;
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cpu_dn = of_cpu_device_node_get(cpu);
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of_node_put(cpu_dn);
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if (dn == cpu_dn)
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break;
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}
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if (cpu >= nr_cpu_ids) {
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pr_warn("failed to find logical CPU for %s\n", dn->name);
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}
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of_node_put(dn);
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return cpu;
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}
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static int pmu_parse_irqs(struct arm_pmu *pmu)
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{
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int i = 0, num_irqs;
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struct platform_device *pdev = pmu->plat_device;
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struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
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num_irqs = platform_irq_count(pdev);
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if (num_irqs < 0) {
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pr_err("unable to count PMU IRQs\n");
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return num_irqs;
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}
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/*
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* In this case we have no idea which CPUs are covered by the PMU.
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* To match our prior behaviour, we assume all CPUs in this case.
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*/
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if (num_irqs == 0) {
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pr_warn("no irqs for PMU, sampling events not supported\n");
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pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
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cpumask_setall(&pmu->supported_cpus);
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return 0;
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}
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if (num_irqs == 1) {
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int irq = platform_get_irq(pdev, 0);
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if (irq && irq_is_percpu(irq))
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return pmu_parse_percpu_irq(pmu, irq);
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}
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if (!pmu_has_irq_affinity(pdev->dev.of_node)) {
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pr_warn("no interrupt-affinity property for %s, guessing.\n",
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of_node_full_name(pdev->dev.of_node));
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}
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/*
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* Some platforms have all PMU IRQs OR'd into a single IRQ, with a
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* special platdata function that attempts to demux them.
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*/
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if (dev_get_platdata(&pdev->dev))
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cpumask_setall(&pmu->supported_cpus);
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for (i = 0; i < num_irqs; i++) {
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int cpu, irq;
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irq = platform_get_irq(pdev, i);
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if (WARN_ON(irq <= 0))
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continue;
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if (irq_is_percpu(irq)) {
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pr_warn("multiple PPIs or mismatched SPI/PPI detected\n");
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return -EINVAL;
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}
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cpu = pmu_parse_irq_affinity(pdev->dev.of_node, i);
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if (cpu < 0)
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return cpu;
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if (cpu >= nr_cpu_ids)
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continue;
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if (per_cpu(hw_events->irq, cpu)) {
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pr_warn("multiple PMU IRQs for the same CPU detected\n");
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return -EINVAL;
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}
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per_cpu(hw_events->irq, cpu) = irq;
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cpumask_set_cpu(cpu, &pmu->supported_cpus);
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}
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return 0;
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}
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int arm_pmu_device_probe(struct platform_device *pdev,
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const struct of_device_id *of_table,
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const struct pmu_probe_info *probe_table)
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{
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const struct of_device_id *of_id;
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armpmu_init_fn init_fn;
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struct device_node *node = pdev->dev.of_node;
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struct arm_pmu *pmu;
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int ret = -ENODEV;
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pmu = armpmu_alloc();
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if (!pmu)
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return -ENOMEM;
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pmu->plat_device = pdev;
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ret = pmu_parse_irqs(pmu);
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if (ret)
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goto out_free;
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if (node && (of_id = of_match_node(of_table, pdev->dev.of_node))) {
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init_fn = of_id->data;
|
||||
|
||||
pmu->secure_access = of_property_read_bool(pdev->dev.of_node,
|
||||
"secure-reg-access");
|
||||
|
||||
/* arm64 systems boot only as non-secure */
|
||||
if (IS_ENABLED(CONFIG_ARM64) && pmu->secure_access) {
|
||||
pr_warn("ignoring \"secure-reg-access\" property for arm64\n");
|
||||
pmu->secure_access = false;
|
||||
}
|
||||
|
||||
ret = init_fn(pmu);
|
||||
} else if (probe_table) {
|
||||
cpumask_setall(&pmu->supported_cpus);
|
||||
ret = probe_current_pmu(pmu, probe_table);
|
||||
}
|
||||
|
||||
if (ret) {
|
||||
pr_info("%s: failed to probe PMU!\n", of_node_full_name(node));
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
ret = armpmu_request_irqs(pmu);
|
||||
if (ret)
|
||||
goto out_free_irqs;
|
||||
|
||||
ret = armpmu_register(pmu);
|
||||
if (ret)
|
||||
goto out_free;
|
||||
|
||||
return 0;
|
||||
|
||||
out_free_irqs:
|
||||
armpmu_free_irqs(pmu);
|
||||
out_free:
|
||||
pr_info("%s: failed to register PMU devices!\n",
|
||||
of_node_full_name(node));
|
||||
armpmu_free(pmu);
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -159,6 +159,13 @@ int arm_pmu_device_probe(struct platform_device *pdev,
|
|||
const struct of_device_id *of_table,
|
||||
const struct pmu_probe_info *probe_table);
|
||||
|
||||
/* Internal functions only for core arm_pmu code */
|
||||
struct arm_pmu *armpmu_alloc(void);
|
||||
void armpmu_free(struct arm_pmu *pmu);
|
||||
int armpmu_register(struct arm_pmu *pmu);
|
||||
int armpmu_request_irqs(struct arm_pmu *armpmu);
|
||||
void armpmu_free_irqs(struct arm_pmu *armpmu);
|
||||
|
||||
#define ARMV8_PMU_PDEV_NAME "armv8-pmu"
|
||||
|
||||
#endif /* CONFIG_ARM_PMU */
|
||||
|
|
|
|||
Loading…
Reference in New Issue