diff options
Diffstat (limited to 'drivers/perf/arm_dsu_pmu.c')
| -rw-r--r-- | drivers/perf/arm_dsu_pmu.c | 137 |
1 files changed, 79 insertions, 58 deletions
diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c index 660cb8ac886a..cb4fb59fe04b 100644 --- a/drivers/perf/arm_dsu_pmu.c +++ b/drivers/perf/arm_dsu_pmu.c @@ -1,19 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ARM DynamIQ Shared Unit (DSU) PMU driver * * Copyright (C) ARM Limited, 2017. * * Based on ARM CCI-PMU, ARMv8 PMU-v3 drivers. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. */ #define PMUNAME "arm_dsu" #define DRVNAME PMUNAME "_pmu" #define pr_fmt(fmt) DRVNAME ": " fmt +#include <linux/acpi.h> #include <linux/bitmap.h> #include <linux/bitops.h> #include <linux/bug.h> @@ -22,7 +20,7 @@ #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/of_device.h> +#include <linux/of.h> #include <linux/perf_event.h> #include <linux/platform_device.h> #include <linux/spinlock.h> @@ -87,7 +85,7 @@ DSU_EXT_ATTR(_name, dsu_pmu_sysfs_event_show, (unsigned long)_config) #define DSU_FORMAT_ATTR(_name, _config) \ - DSU_EXT_ATTR(_name, dsu_pmu_sysfs_format_show, (char *)_config) + DSU_EXT_ATTR(_name, device_show_string, _config) #define DSU_CPUMASK_ATTR(_name, _config) \ DSU_EXT_ATTR(_name, dsu_pmu_cpumask_show, (unsigned long)_config) @@ -138,17 +136,7 @@ static ssize_t dsu_pmu_sysfs_event_show(struct device *dev, { struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "event=0x%lx\n", - (unsigned long)eattr->var); -} - -static ssize_t dsu_pmu_sysfs_format_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct dev_ext_attribute *eattr = container_of(attr, - struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "%s\n", (char *)eattr->var); + return sysfs_emit(buf, "event=0x%lx\n", (unsigned long)eattr->var); } static ssize_t dsu_pmu_cpumask_show(struct device *dev, @@ -233,15 +221,6 @@ static const struct attribute_group *dsu_pmu_attr_groups[] = { NULL, }; -static int dsu_pmu_get_online_cpu_any_but(struct dsu_pmu *dsu_pmu, int cpu) -{ - struct cpumask online_supported; - - cpumask_and(&online_supported, - &dsu_pmu->associated_cpus, cpu_online_mask); - return cpumask_any_but(&online_supported, cpu); -} - static inline bool dsu_pmu_counter_valid(struct dsu_pmu *dsu_pmu, u32 idx) { return (idx < dsu_pmu->num_counters) || @@ -374,7 +353,7 @@ static inline u32 dsu_pmu_get_reset_overflow(void) return __dsu_pmu_get_reset_overflow(); } -/** +/* * dsu_pmu_set_event_period: Set the period for the counter. * * All DSU PMU event counters, except the cycle counter are 32bit @@ -562,13 +541,7 @@ static int dsu_pmu_event_init(struct perf_event *event) return -EINVAL; } - if (has_branch_stack(event) || - event->attr.exclude_user || - event->attr.exclude_kernel || - event->attr.exclude_hv || - event->attr.exclude_idle || - event->attr.exclude_host || - event->attr.exclude_guest) { + if (has_branch_stack(event)) { dev_dbg(dsu_pmu->pmu.dev, "Can't support filtering\n"); return -EINVAL; } @@ -611,19 +584,20 @@ static struct dsu_pmu *dsu_pmu_alloc(struct platform_device *pdev) return dsu_pmu; } -/** - * dsu_pmu_dt_get_cpus: Get the list of CPUs in the cluster. +/* + * dsu_pmu_dt_get_cpus: Get the list of CPUs in the cluster + * from device tree. */ -static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *mask) +static int dsu_pmu_dt_get_cpus(struct device *dev, cpumask_t *mask) { int i = 0, n, cpu; struct device_node *cpu_node; - n = of_count_phandle_with_args(dev, "cpus", NULL); + n = of_count_phandle_with_args(dev->of_node, "cpus", NULL); if (n <= 0) return -ENODEV; for (; i < n; i++) { - cpu_node = of_parse_phandle(dev, "cpus", i); + cpu_node = of_parse_phandle(dev->of_node, "cpus", i); if (!cpu_node) break; cpu = of_cpu_node_to_id(cpu_node); @@ -641,6 +615,36 @@ static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *mask) } /* + * dsu_pmu_acpi_get_cpus: Get the list of CPUs in the cluster + * from ACPI. + */ +static int dsu_pmu_acpi_get_cpus(struct device *dev, cpumask_t *mask) +{ +#ifdef CONFIG_ACPI + struct acpi_device *parent_adev = acpi_dev_parent(ACPI_COMPANION(dev)); + int cpu; + + /* + * A dsu pmu node is inside a cluster parent node along with cpu nodes. + * We need to find out all cpus that have the same parent with this pmu. + */ + for_each_possible_cpu(cpu) { + struct acpi_device *acpi_dev; + struct device *cpu_dev = get_cpu_device(cpu); + + if (!cpu_dev) + continue; + + acpi_dev = ACPI_COMPANION(cpu_dev); + if (acpi_dev && acpi_dev_parent(acpi_dev) == parent_adev) + cpumask_set_cpu(cpu, mask); + } +#endif + + return 0; +} + +/* * dsu_pmu_probe_pmu: Probe the PMU details on a CPU in the cluster. */ static void dsu_pmu_probe_pmu(struct dsu_pmu *dsu_pmu) @@ -665,7 +669,7 @@ static void dsu_pmu_probe_pmu(struct dsu_pmu *dsu_pmu) static void dsu_pmu_set_active_cpu(int cpu, struct dsu_pmu *dsu_pmu) { cpumask_set_cpu(cpu, &dsu_pmu->active_cpu); - if (irq_set_affinity_hint(dsu_pmu->irq, &dsu_pmu->active_cpu)) + if (irq_set_affinity(dsu_pmu->irq, &dsu_pmu->active_cpu)) pr_warn("Failed to set irq affinity to %d\n", cpu); } @@ -685,6 +689,7 @@ static int dsu_pmu_device_probe(struct platform_device *pdev) { int irq, rc; struct dsu_pmu *dsu_pmu; + struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev); char *name; static atomic_t pmu_idx = ATOMIC_INIT(-1); @@ -692,17 +697,21 @@ static int dsu_pmu_device_probe(struct platform_device *pdev) if (IS_ERR(dsu_pmu)) return PTR_ERR(dsu_pmu); - rc = dsu_pmu_dt_get_cpus(pdev->dev.of_node, &dsu_pmu->associated_cpus); + if (is_of_node(fwnode)) + rc = dsu_pmu_dt_get_cpus(&pdev->dev, &dsu_pmu->associated_cpus); + else if (is_acpi_device_node(fwnode)) + rc = dsu_pmu_acpi_get_cpus(&pdev->dev, &dsu_pmu->associated_cpus); + else + return -ENOENT; + if (rc) { dev_warn(&pdev->dev, "Failed to parse the CPUs\n"); return rc; } irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_warn(&pdev->dev, "Failed to find IRQ\n"); + if (irq < 0) return -EINVAL; - } name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d", PMUNAME, atomic_inc_return(&pmu_idx)); @@ -724,6 +733,7 @@ static int dsu_pmu_device_probe(struct platform_device *pdev) dsu_pmu->pmu = (struct pmu) { .task_ctx_nr = perf_invalid_context, + .parent = &pdev->dev, .module = THIS_MODULE, .pmu_enable = dsu_pmu_enable, .pmu_disable = dsu_pmu_disable, @@ -735,38 +745,46 @@ static int dsu_pmu_device_probe(struct platform_device *pdev) .read = dsu_pmu_read, .attr_groups = dsu_pmu_attr_groups, + .capabilities = PERF_PMU_CAP_NO_EXCLUDE, }; rc = perf_pmu_register(&dsu_pmu->pmu, name, -1); if (rc) { cpuhp_state_remove_instance(dsu_pmu_cpuhp_state, &dsu_pmu->cpuhp_node); - irq_set_affinity_hint(dsu_pmu->irq, NULL); } return rc; } -static int dsu_pmu_device_remove(struct platform_device *pdev) +static void dsu_pmu_device_remove(struct platform_device *pdev) { struct dsu_pmu *dsu_pmu = platform_get_drvdata(pdev); perf_pmu_unregister(&dsu_pmu->pmu); cpuhp_state_remove_instance(dsu_pmu_cpuhp_state, &dsu_pmu->cpuhp_node); - irq_set_affinity_hint(dsu_pmu->irq, NULL); - - return 0; } static const struct of_device_id dsu_pmu_of_match[] = { { .compatible = "arm,dsu-pmu", }, {}, }; +MODULE_DEVICE_TABLE(of, dsu_pmu_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id dsu_pmu_acpi_match[] = { + { "ARMHD500", 0}, + {}, +}; +MODULE_DEVICE_TABLE(acpi, dsu_pmu_acpi_match); +#endif static struct platform_driver dsu_pmu_driver = { .driver = { .name = DRVNAME, .of_match_table = of_match_ptr(dsu_pmu_of_match), + .acpi_match_table = ACPI_PTR(dsu_pmu_acpi_match), + .suppress_bind_attrs = true, }, .probe = dsu_pmu_device_probe, .remove = dsu_pmu_device_remove, @@ -792,19 +810,19 @@ static int dsu_pmu_cpu_online(unsigned int cpu, struct hlist_node *node) static int dsu_pmu_cpu_teardown(unsigned int cpu, struct hlist_node *node) { - int dst; - struct dsu_pmu *dsu_pmu = hlist_entry_safe(node, struct dsu_pmu, - cpuhp_node); + struct dsu_pmu *dsu_pmu; + unsigned int dst; + + dsu_pmu = hlist_entry_safe(node, struct dsu_pmu, cpuhp_node); if (!cpumask_test_and_clear_cpu(cpu, &dsu_pmu->active_cpu)) return 0; - dst = dsu_pmu_get_online_cpu_any_but(dsu_pmu, cpu); + dst = cpumask_any_and_but(&dsu_pmu->associated_cpus, + cpu_online_mask, cpu); /* If there are no active CPUs in the DSU, leave IRQ disabled */ - if (dst >= nr_cpu_ids) { - irq_set_affinity_hint(dsu_pmu->irq, NULL); + if (dst >= nr_cpu_ids) return 0; - } perf_pmu_migrate_context(&dsu_pmu->pmu, cpu, dst); dsu_pmu_set_active_cpu(dst, dsu_pmu); @@ -823,7 +841,11 @@ static int __init dsu_pmu_init(void) if (ret < 0) return ret; dsu_pmu_cpuhp_state = ret; - return platform_driver_register(&dsu_pmu_driver); + ret = platform_driver_register(&dsu_pmu_driver); + if (ret) + cpuhp_remove_multi_state(dsu_pmu_cpuhp_state); + + return ret; } static void __exit dsu_pmu_exit(void) @@ -835,7 +857,6 @@ static void __exit dsu_pmu_exit(void) module_init(dsu_pmu_init); module_exit(dsu_pmu_exit); -MODULE_DEVICE_TABLE(of, dsu_pmu_of_match); MODULE_DESCRIPTION("Perf driver for ARM DynamIQ Shared Unit"); MODULE_AUTHOR("Suzuki K Poulose <suzuki.poulose@arm.com>"); MODULE_LICENSE("GPL v2"); |