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![Robin Murphy](/assets/img/avatar_default.png)
Nearly all of the messages we can log from the platform device code relate to the specific PMU device and the properties we're parsing from its DT node. In some cases we use %pOF to point at where something was wrong, but even that is inconsistent. Let's convert these logs to the appropriate dev_printk variants, so that every issue specific to the device and/or its DT description is clearly and instantly attributable, particularly if there is more than one PMU node present in the DT. The local refactoring in a couple of functions invites some extra cleanup in the process - the init_fn matching can be streamlined, and the PMU registration failure message moved to the appropriate place and log level. CC: Tian Tao <tiantao6@hisilicon.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/10a4aacdf071d0c03d061c408a5899e5b32cc0a6.1616774562.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org>
245 lines
5.4 KiB
C
245 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#define dev_fmt pr_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 *dev, 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(dev->of_node))
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return i;
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dn = of_parse_phandle(dev->of_node, "interrupt-affinity", i);
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if (!dn) {
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dev_warn(dev, "failed to parse interrupt-affinity[%d]\n", i);
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return -EINVAL;
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}
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cpu = of_cpu_node_to_id(dn);
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if (cpu < 0) {
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dev_warn(dev, "failed to find logical CPU for %pOFn\n", dn);
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cpu = nr_cpu_ids;
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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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struct device *dev = &pdev->dev;
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num_irqs = platform_irq_count(pdev);
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if (num_irqs < 0)
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return dev_err_probe(dev, num_irqs, "unable to count PMU IRQs\n");
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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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dev_warn(dev, "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_devid(irq))
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return pmu_parse_percpu_irq(pmu, irq);
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}
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if (nr_cpu_ids != 1 && !pmu_has_irq_affinity(dev->of_node))
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dev_warn(dev, "no interrupt-affinity property, guessing.\n");
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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_devid(irq)) {
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dev_warn(dev, "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(dev, 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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dev_warn(dev, "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 int armpmu_request_irqs(struct arm_pmu *armpmu)
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{
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struct pmu_hw_events __percpu *hw_events = armpmu->hw_events;
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int cpu, err = 0;
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for_each_cpu(cpu, &armpmu->supported_cpus) {
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int irq = per_cpu(hw_events->irq, cpu);
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if (!irq)
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continue;
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err = armpmu_request_irq(irq, cpu);
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if (err)
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break;
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}
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return err;
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}
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static void armpmu_free_irqs(struct arm_pmu *armpmu)
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{
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int cpu;
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struct pmu_hw_events __percpu *hw_events = armpmu->hw_events;
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for_each_cpu(cpu, &armpmu->supported_cpus) {
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int irq = per_cpu(hw_events->irq, cpu);
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armpmu_free_irq(irq, cpu);
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}
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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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armpmu_init_fn init_fn;
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struct device *dev = &pdev->dev;
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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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init_fn = of_device_get_match_data(dev);
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if (init_fn) {
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pmu->secure_access = of_property_read_bool(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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dev_warn(dev, "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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dev_err(dev, "failed to probe PMU!\n");
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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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dev_err(dev, "failed to register PMU devices!\n");
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goto out_free_irqs;
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}
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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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armpmu_free(pmu);
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return ret;
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}
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