diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 8 | ||||
| -rw-r--r-- | arch/arm/include/asm/pmu.h | 154 | ||||
| -rw-r--r-- | arch/arm/kernel/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/kernel/perf_event.c | 921 | ||||
| -rw-r--r-- | arch/arm/kernel/perf_event_v6.c | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/perf_event_v7.c | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/perf_event_xscale.c | 2 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/cpu-db8500.c | 2 |
8 files changed, 7 insertions, 1087 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 1c5021002fe4..4f7bc3d4b186 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1701,12 +1701,8 @@ config HIGHPTE user-space 2nd level page tables to reside in high memory. config HW_PERF_EVENTS - bool "Enable hardware performance counter support for perf events" - depends on PERF_EVENTS - default y - help - Enable hardware performance counter support for perf events. If - disabled, perf events will use software events only. + def_bool y + depends on ARM_PMU config SYS_SUPPORTS_HUGETLBFS def_bool y diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h deleted file mode 100644 index 3fc87dfd77e6..000000000000 --- a/arch/arm/include/asm/pmu.h +++ /dev/null @@ -1,154 +0,0 @@ -/* - * linux/arch/arm/include/asm/pmu.h - * - * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles - * - * 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. - * - */ - -#ifndef __ARM_PMU_H__ -#define __ARM_PMU_H__ - -#include <linux/interrupt.h> -#include <linux/perf_event.h> - -#include <asm/cputype.h> - -/* - * struct arm_pmu_platdata - ARM PMU platform data - * - * @handle_irq: an optional handler which will be called from the - * interrupt and passed the address of the low level handler, - * and can be used to implement any platform specific handling - * before or after calling it. - */ -struct arm_pmu_platdata { - irqreturn_t (*handle_irq)(int irq, void *dev, - irq_handler_t pmu_handler); -}; - -#ifdef CONFIG_HW_PERF_EVENTS - -/* - * The ARMv7 CPU PMU supports up to 32 event counters. - */ -#define ARMPMU_MAX_HWEVENTS 32 - -#define HW_OP_UNSUPPORTED 0xFFFF -#define C(_x) PERF_COUNT_HW_CACHE_##_x -#define CACHE_OP_UNSUPPORTED 0xFFFF - -#define PERF_MAP_ALL_UNSUPPORTED \ - [0 ... PERF_COUNT_HW_MAX - 1] = HW_OP_UNSUPPORTED - -#define PERF_CACHE_MAP_ALL_UNSUPPORTED \ -[0 ... C(MAX) - 1] = { \ - [0 ... C(OP_MAX) - 1] = { \ - [0 ... C(RESULT_MAX) - 1] = CACHE_OP_UNSUPPORTED, \ - }, \ -} - -/* The events for a given PMU register set. */ -struct pmu_hw_events { - /* - * The events that are active on the PMU for the given index. - */ - struct perf_event *events[ARMPMU_MAX_HWEVENTS]; - - /* - * A 1 bit for an index indicates that the counter is being used for - * an event. A 0 means that the counter can be used. - */ - DECLARE_BITMAP(used_mask, ARMPMU_MAX_HWEVENTS); - - /* - * Hardware lock to serialize accesses to PMU registers. Needed for the - * read/modify/write sequences. - */ - raw_spinlock_t pmu_lock; - - /* - * When using percpu IRQs, we need a percpu dev_id. Place it here as we - * already have to allocate this struct per cpu. - */ - struct arm_pmu *percpu_pmu; -}; - -struct arm_pmu { - struct pmu pmu; - cpumask_t active_irqs; - cpumask_t supported_cpus; - int *irq_affinity; - char *name; - irqreturn_t (*handle_irq)(int irq_num, void *dev); - void (*enable)(struct perf_event *event); - void (*disable)(struct perf_event *event); - int (*get_event_idx)(struct pmu_hw_events *hw_events, - struct perf_event *event); - void (*clear_event_idx)(struct pmu_hw_events *hw_events, - struct perf_event *event); - int (*set_event_filter)(struct hw_perf_event *evt, - struct perf_event_attr *attr); - u32 (*read_counter)(struct perf_event *event); - void (*write_counter)(struct perf_event *event, u32 val); - void (*start)(struct arm_pmu *); - void (*stop)(struct arm_pmu *); - void (*reset)(void *); - int (*request_irq)(struct arm_pmu *, irq_handler_t handler); - void (*free_irq)(struct arm_pmu *); - int (*map_event)(struct perf_event *event); - int num_events; - atomic_t active_events; - struct mutex reserve_mutex; - u64 max_period; - struct platform_device *plat_device; - struct pmu_hw_events __percpu *hw_events; - struct notifier_block hotplug_nb; -}; - -#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) - -int armpmu_register(struct arm_pmu *armpmu, int type); - -u64 armpmu_event_update(struct perf_event *event); - -int armpmu_event_set_period(struct perf_event *event); - -int armpmu_map_event(struct perf_event *event, - const unsigned (*event_map)[PERF_COUNT_HW_MAX], - const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX] - [PERF_COUNT_HW_CACHE_OP_MAX] - [PERF_COUNT_HW_CACHE_RESULT_MAX], - u32 raw_event_mask); - -struct pmu_probe_info { - unsigned int cpuid; - unsigned int mask; - int (*init)(struct arm_pmu *); -}; - -#define PMU_PROBE(_cpuid, _mask, _fn) \ -{ \ - .cpuid = (_cpuid), \ - .mask = (_mask), \ - .init = (_fn), \ -} - -#define ARM_PMU_PROBE(_cpuid, _fn) \ - PMU_PROBE(_cpuid, ARM_CPU_PART_MASK, _fn) - -#define ARM_PMU_XSCALE_MASK ((0xff << 24) | ARM_CPU_XSCALE_ARCH_MASK) - -#define XSCALE_PMU_PROBE(_version, _fn) \ - PMU_PROBE(ARM_CPU_IMP_INTEL << 24 | _version, ARM_PMU_XSCALE_MASK, _fn) - -int arm_pmu_device_probe(struct platform_device *pdev, - const struct of_device_id *of_table, - const struct pmu_probe_info *probe_table); - -#endif /* CONFIG_HW_PERF_EVENTS */ - -#endif /* __ARM_PMU_H__ */ diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index e69f7a19735d..fcb25c1c5c21 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -71,8 +71,7 @@ obj-$(CONFIG_CPU_PJ4) += pj4-cp0.o obj-$(CONFIG_CPU_PJ4B) += pj4-cp0.o obj-$(CONFIG_IWMMXT) += iwmmxt.o obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o -obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o \ - perf_event_xscale.o perf_event_v6.o \ +obj-$(CONFIG_HW_PERF_EVENTS) += perf_event_xscale.o perf_event_v6.o \ perf_event_v7.o CFLAGS_pj4-cp0.o := -marm AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c deleted file mode 100644 index 1cb40651d783..000000000000 --- a/arch/arm/kernel/perf_event.c +++ /dev/null @@ -1,921 +0,0 @@ -#undef DEBUG - -/* - * ARM performance counter support. - * - * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles - * Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com> - * - * This code is based on the sparc64 perf event code, which is in turn based - * on the x86 code. - */ -#define pr_fmt(fmt) "hw perfevents: " fmt - -#include <linux/bitmap.h> -#include <linux/cpumask.h> -#include <linux/export.h> -#include <linux/kernel.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/irq.h> -#include <linux/irqdesc.h> - -#include <asm/cputype.h> -#include <asm/irq_regs.h> -#include <asm/pmu.h> - -static int -armpmu_map_cache_event(const unsigned (*cache_map) - [PERF_COUNT_HW_CACHE_MAX] - [PERF_COUNT_HW_CACHE_OP_MAX] - [PERF_COUNT_HW_CACHE_RESULT_MAX], - u64 config) -{ - unsigned int cache_type, cache_op, cache_result, ret; - - cache_type = (config >> 0) & 0xff; - if (cache_type >= PERF_COUNT_HW_CACHE_MAX) - return -EINVAL; - - cache_op = (config >> 8) & 0xff; - if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) - return -EINVAL; - - cache_result = (config >> 16) & 0xff; - if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) - return -EINVAL; - - ret = (int)(*cache_map)[cache_type][cache_op][cache_result]; - - if (ret == CACHE_OP_UNSUPPORTED) - return -ENOENT; - - return ret; -} - -static int -armpmu_map_hw_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config) -{ - int mapping; - - if (config >= PERF_COUNT_HW_MAX) - return -EINVAL; - - mapping = (*event_map)[config]; - return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping; -} - -static int -armpmu_map_raw_event(u32 raw_event_mask, u64 config) -{ - return (int)(config & raw_event_mask); -} - -int -armpmu_map_event(struct perf_event *event, - const unsigned (*event_map)[PERF_COUNT_HW_MAX], - const unsigned (*cache_map) - [PERF_COUNT_HW_CACHE_MAX] - [PERF_COUNT_HW_CACHE_OP_MAX] - [PERF_COUNT_HW_CACHE_RESULT_MAX], - u32 raw_event_mask) -{ - u64 config = event->attr.config; - int type = event->attr.type; - - if (type == event->pmu->type) - return armpmu_map_raw_event(raw_event_mask, config); - - switch (type) { - case PERF_TYPE_HARDWARE: - return armpmu_map_hw_event(event_map, config); - case PERF_TYPE_HW_CACHE: - return armpmu_map_cache_event(cache_map, config); - case PERF_TYPE_RAW: - return armpmu_map_raw_event(raw_event_mask, config); - } - - return -ENOENT; -} - -int armpmu_event_set_period(struct perf_event *event) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct hw_perf_event *hwc = &event->hw; - s64 left = local64_read(&hwc->period_left); - s64 period = hwc->sample_period; - int ret = 0; - - if (unlikely(left <= -period)) { - left = period; - local64_set(&hwc->period_left, left); - hwc->last_period = period; - ret = 1; - } - - if (unlikely(left <= 0)) { - left += period; - local64_set(&hwc->period_left, left); - hwc->last_period = period; - ret = 1; - } - - /* - * Limit the maximum period to prevent the counter value - * from overtaking the one we are about to program. In - * effect we are reducing max_period to account for - * interrupt latency (and we are being very conservative). - */ - if (left > (armpmu->max_period >> 1)) - left = armpmu->max_period >> 1; - - local64_set(&hwc->prev_count, (u64)-left); - - armpmu->write_counter(event, (u64)(-left) & 0xffffffff); - - perf_event_update_userpage(event); - - return ret; -} - -u64 armpmu_event_update(struct perf_event *event) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct hw_perf_event *hwc = &event->hw; - u64 delta, prev_raw_count, new_raw_count; - -again: - prev_raw_count = local64_read(&hwc->prev_count); - new_raw_count = armpmu->read_counter(event); - - if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, - new_raw_count) != prev_raw_count) - goto again; - - delta = (new_raw_count - prev_raw_count) & armpmu->max_period; - - local64_add(delta, &event->count); - local64_sub(delta, &hwc->period_left); - - return new_raw_count; -} - -static void -armpmu_read(struct perf_event *event) -{ - armpmu_event_update(event); -} - -static void -armpmu_stop(struct perf_event *event, int flags) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct hw_perf_event *hwc = &event->hw; - - /* - * ARM pmu always has to update the counter, so ignore - * PERF_EF_UPDATE, see comments in armpmu_start(). - */ - if (!(hwc->state & PERF_HES_STOPPED)) { - armpmu->disable(event); - armpmu_event_update(event); - hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; - } -} - -static void armpmu_start(struct perf_event *event, int flags) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct hw_perf_event *hwc = &event->hw; - - /* - * ARM pmu always has to reprogram the period, so ignore - * PERF_EF_RELOAD, see the comment below. - */ - if (flags & PERF_EF_RELOAD) - WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); - - hwc->state = 0; - /* - * Set the period again. Some counters can't be stopped, so when we - * were stopped we simply disabled the IRQ source and the counter - * may have been left counting. If we don't do this step then we may - * get an interrupt too soon or *way* too late if the overflow has - * happened since disabling. - */ - armpmu_event_set_period(event); - armpmu->enable(event); -} - -static void -armpmu_del(struct perf_event *event, int flags) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events); - struct hw_perf_event *hwc = &event->hw; - int idx = hwc->idx; - - armpmu_stop(event, PERF_EF_UPDATE); - hw_events->events[idx] = NULL; - clear_bit(idx, hw_events->used_mask); - if (armpmu->clear_event_idx) - armpmu->clear_event_idx(hw_events, event); - - perf_event_update_userpage(event); -} - -static int -armpmu_add(struct perf_event *event, int flags) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events); - struct hw_perf_event *hwc = &event->hw; - int idx; - int err = 0; - - /* An event following a process won't be stopped earlier */ - if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus)) - return -ENOENT; - - perf_pmu_disable(event->pmu); - - /* If we don't have a space for the counter then finish early. */ - idx = armpmu->get_event_idx(hw_events, event); - if (idx < 0) { - err = idx; - goto out; - } - - /* - * If there is an event in the counter we are going to use then make - * sure it is disabled. - */ - event->hw.idx = idx; - armpmu->disable(event); - hw_events->events[idx] = event; - - hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; - if (flags & PERF_EF_START) - armpmu_start(event, PERF_EF_RELOAD); - - /* Propagate our changes to the userspace mapping. */ - perf_event_update_userpage(event); - -out: - perf_pmu_enable(event->pmu); - return err; -} - -static int -validate_event(struct pmu *pmu, struct pmu_hw_events *hw_events, - struct perf_event *event) -{ - struct arm_pmu *armpmu; - - if (is_software_event(event)) - return 1; - - /* - * Reject groups spanning multiple HW PMUs (e.g. CPU + CCI). The - * core perf code won't check that the pmu->ctx == leader->ctx - * until after pmu->event_init(event). - */ - if (event->pmu != pmu) - return 0; - - if (event->state < PERF_EVENT_STATE_OFF) - return 1; - - if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec) - return 1; - - armpmu = to_arm_pmu(event->pmu); - return armpmu->get_event_idx(hw_events, event) >= 0; -} - -static int -validate_group(struct perf_event *event) -{ - struct perf_event *sibling, *leader = event->group_leader; - struct pmu_hw_events fake_pmu; - - /* - * Initialise the fake PMU. We only need to populate the - * used_mask for the purposes of validation. - */ - memset(&fake_pmu.used_mask, 0, sizeof(fake_pmu.used_mask)); - - if (!validate_event(event->pmu, &fake_pmu, leader)) - return -EINVAL; - - list_for_each_entry(sibling, &leader->sibling_list, group_entry) { - if (!validate_event(event->pmu, &fake_pmu, sibling)) - return -EINVAL; - } - - if (!validate_event(event->pmu, &fake_pmu, event)) - return -EINVAL; - - return 0; -} - -static irqreturn_t armpmu_dispatch_irq(int irq, void *dev) -{ - struct arm_pmu *armpmu; - struct platform_device *plat_device; - struct arm_pmu_platdata *plat; - int ret; - u64 start_clock, finish_clock; - - /* - * we request the IRQ with a (possibly percpu) struct arm_pmu**, but - * the handlers expect a struct arm_pmu*. The percpu_irq framework will - * do any necessary shifting, we just need to perform the first - * dereference. - */ - armpmu = *(void **)dev; - plat_device = armpmu->plat_device; - plat = dev_get_platdata(&plat_device->dev); - - start_clock = sched_clock(); - if (plat && plat->handle_irq) - ret = plat->handle_irq(irq, armpmu, armpmu->handle_irq); - else - ret = armpmu->handle_irq(irq, armpmu); - finish_clock = sched_clock(); - - perf_sample_event_took(finish_clock - start_clock); - return ret; -} - -static void -armpmu_release_hardware(struct arm_pmu *armpmu) -{ - armpmu->free_irq(armpmu); -} - -static int -armpmu_reserve_hardware(struct arm_pmu *armpmu) -{ - int err = armpmu->request_irq(armpmu, armpmu_dispatch_irq); - if (err) { - armpmu_release_hardware(armpmu); - return err; - } - - return 0; -} - -static void -hw_perf_event_destroy(struct perf_event *event) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - atomic_t *active_events = &armpmu->active_events; - struct mutex *pmu_reserve_mutex = &armpmu->reserve_mutex; - - if (atomic_dec_and_mutex_lock(active_events, pmu_reserve_mutex)) { - armpmu_release_hardware(armpmu); - mutex_unlock(pmu_reserve_mutex); - } -} - -static int -event_requires_mode_exclusion(struct perf_event_attr *attr) -{ - return attr->exclude_idle || attr->exclude_user || - attr->exclude_kernel || attr->exclude_hv; -} - -static int -__hw_perf_event_init(struct perf_event *event) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - struct hw_perf_event *hwc = &event->hw; - int mapping; - - mapping = armpmu->map_event(event); - - if (mapping < 0) { - pr_debug("event %x:%llx not supported\n", event->attr.type, - event->attr.config); - return mapping; - } - - /* - * We don't assign an index until we actually place the event onto - * hardware. Use -1 to signify that we haven't decided where to put it - * yet. For SMP systems, each core has it's own PMU so we can't do any - * clever allocation or constraints checking at this point. - */ - hwc->idx = -1; - hwc->config_base = 0; - hwc->config = 0; - hwc->event_base = 0; - - /* - * Check whether we need to exclude the counter from certain modes. - */ - if ((!armpmu->set_event_filter || - armpmu->set_event_filter(hwc, &event->attr)) && - event_requires_mode_exclusion(&event->attr)) { - pr_debug("ARM performance counters do not support " - "mode exclusion\n"); - return -EOPNOTSUPP; - } - - /* - * Store the event encoding into the config_base field. - */ - hwc->config_base |= (unsigned long)mapping; - - if (!is_sampling_event(event)) { - /* - * For non-sampling runs, limit the sample_period to half - * of the counter width. That way, the new counter value - * is far less likely to overtake the previous one unless - * you have some serious IRQ latency issues. - */ - hwc->sample_period = armpmu->max_period >> 1; - hwc->last_period = hwc->sample_period; - local64_set(&hwc->period_left, hwc->sample_period); - } - - if (event->group_leader != event) { - if (validate_group(event) != 0) - return -EINVAL; - } - - return 0; -} - -static int armpmu_event_init(struct perf_event *event) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - int err = 0; - atomic_t *active_events = &armpmu->active_events; - - /* - * Reject CPU-affine events for CPUs that are of a different class to - * that which this PMU handles. Process-following events (where - * event->cpu == -1) can be migrated between CPUs, and thus we have to - * reject them later (in armpmu_add) if they're scheduled on a - * different class of CPU. - */ - if (event->cpu != -1 && - !cpumask_test_cpu(event->cpu, &armpmu->supported_cpus)) - return -ENOENT; - - /* does not support taken branch sampling */ - if (has_branch_stack(event)) - return -EOPNOTSUPP; - - if (armpmu->map_event(event) == -ENOENT) - return -ENOENT; - - event->destroy = hw_perf_event_destroy; - - if (!atomic_inc_not_zero(active_events)) { - mutex_lock(&armpmu->reserve_mutex); - if (atomic_read(active_events) == 0) - err = armpmu_reserve_hardware(armpmu); - - if (!err) - atomic_inc(active_events); - mutex_unlock(&armpmu->reserve_mutex); - } - - if (err) - return err; - - err = __hw_perf_event_init(event); - if (err) - hw_perf_event_destroy(event); - - return err; -} - -static void armpmu_enable(struct pmu *pmu) -{ - struct arm_pmu *armpmu = to_arm_pmu(pmu); - struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events); - int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events); - - /* For task-bound events we may be called on other CPUs */ - if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus)) - return; - - if (enabled) - armpmu->start(armpmu); -} - -static void armpmu_disable(struct pmu *pmu) -{ - struct arm_pmu *armpmu = to_arm_pmu(pmu); - - /* For task-bound events we may be called on other CPUs */ - if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus)) - return; - - armpmu->stop(armpmu); -} - -/* - * In heterogeneous systems, events are specific to a particular - * microarchitecture, and aren't suitable for another. Thus, only match CPUs of - * the same microarchitecture. - */ -static int armpmu_filter_match(struct perf_event *event) -{ - struct arm_pmu *armpmu = to_arm_pmu(event->pmu); - unsigned int cpu = smp_processor_id(); - return cpumask_test_cpu(cpu, &armpmu->supported_cpus); -} - -static void armpmu_init(struct arm_pmu *armpmu) -{ - atomic_set(&armpmu->active_events, 0); - mutex_init(&armpmu->reserve_mutex); - - armpmu->pmu = (struct pmu) { - .pmu_enable = armpmu_enable, - .pmu_disable = armpmu_disable, - .event_init = armpmu_event_init, - .add = armpmu_add, - .del = armpmu_del, - .start = armpmu_start, - .stop = armpmu_stop, - .read = armpmu_read, - .filter_match = armpmu_filter_match, - }; -} - -int armpmu_register(struct arm_pmu *armpmu, int type) -{ - armpmu_init(armpmu); - pr_info("enabled with %s PMU driver, %d counters available\n", - armpmu->name, armpmu->num_events); - return perf_pmu_register(&armpmu->pmu, armpmu->name, type); -} - -/* Set at runtime when we know what CPU type we are. */ -static struct arm_pmu *__oprofile_cpu_pmu; - -/* - * Despite the names, these two functions are CPU-specific and are used - * by the OProfile/perf code. - */ -const char *perf_pmu_name(void) -{ - if (!__oprofile_cpu_pmu) - return NULL; - - return __oprofile_cpu_pmu->name; -} -EXPORT_SYMBOL_GPL(perf_pmu_name); - -int perf_num_counters(void) -{ - int max_events = 0; - - if (__oprofile_cpu_pmu != NULL) - max_events = __oprofile_cpu_pmu->num_events; - - return max_events; -} -EXPORT_SYMBOL_GPL(perf_num_counters); - -static void cpu_pmu_enable_percpu_irq(void *data) -{ - int irq = *(int *)data; - - enable_percpu_irq(irq, IRQ_TYPE_NONE); -} - -static void cpu_pmu_disable_percpu_irq(void *data) -{ - int irq = *(int *)data; - - disable_percpu_irq(irq); -} - -static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu) -{ - int i, irq, irqs; - struct platform_device *pmu_device = cpu_pmu->plat_device; - struct pmu_hw_events __percpu *hw_events = cpu_pmu->hw_events; - - irqs = min(pmu_device->num_resources, num_possible_cpus()); - - irq = platform_get_irq(pmu_device, 0); - if (irq >= 0 && irq_is_percpu(irq)) { - on_each_cpu(cpu_pmu_disable_percpu_irq, &irq, 1); - free_percpu_irq(irq, &hw_events->percpu_pmu); - } else { - for (i = 0; i < irqs; ++i) { - int cpu = i; - - if (cpu_pmu->irq_affinity) - cpu = cpu_pmu->irq_affinity[i]; - - if (!cpumask_test_and_clear_cpu(cpu, &cpu_pmu->active_irqs)) - continue; - irq = platform_get_irq(pmu_device, i); - if (irq >= 0) - free_irq(irq, per_cpu_ptr(&hw_events->percpu_pmu, cpu)); - } - } -} - -static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler) -{ - int i, err, irq, irqs; - struct platform_device *pmu_device = cpu_pmu->plat_device; - struct pmu_hw_events __percpu *hw_events = cpu_pmu->hw_events; - - if (!pmu_device) - return -ENODEV; - - irqs = min(pmu_device->num_resources, num_possible_cpus()); - if (irqs < 1) { - pr_warn_once("perf/ARM: No irqs for PMU defined, sampling events not supported\n"); - return 0; - } - - irq = platform_get_irq(pmu_device, 0); - if (irq >= 0 && irq_is_percpu(irq)) { - err = request_percpu_irq(irq, handler, "arm-pmu", - &hw_events->percpu_pmu); - if (err) { - pr_err("unable to request IRQ%d for ARM PMU counters\n", - irq); - return err; - } - on_each_cpu(cpu_pmu_enable_percpu_irq, &irq, 1); - } else { - for (i = 0; i < irqs; ++i) { - int cpu = i; - - err = 0; - irq = platform_get_irq(pmu_device, i); - if (irq < 0) - continue; - - if (cpu_pmu->irq_affinity) - cpu = cpu_pmu->irq_affinity[i]; - - /* - * 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(cpu)) && irqs > 1) { - pr_warn("unable to set irq affinity (irq=%d, cpu=%u)\n", - irq, cpu); - continue; - } - - err = request_irq(irq, handler, - IRQF_NOBALANCING | IRQF_NO_THREAD, "arm-pmu", - per_cpu_ptr(&hw_events->percpu_pmu, cpu)); - if (err) { - pr_err("unable to request IRQ%d for ARM PMU counters\n", - irq); - return err; - } - - cpumask_set_cpu(cpu, &cpu_pmu->active_irqs); - } - } - - return 0; -} - -/* - * PMU hardware loses all context when a CPU goes offline. - * When a CPU is hotplugged back in, since some hardware registers are - * UNKNOWN at reset, the PMU must be explicitly reset to avoid reading - * junk values out of them. - */ -static int cpu_pmu_notify(struct notifier_block *b, unsigned long action, - void *hcpu) -{ - int cpu = (unsigned long)hcpu; - struct arm_pmu *pmu = container_of(b, struct arm_pmu, hotplug_nb); - - if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING) - return NOTIFY_DONE; - - if (!cpumask_test_cpu(cpu, &pmu->supported_cpus)) - return NOTIFY_DONE; - - if (pmu->reset) - pmu->reset(pmu); - else - return NOTIFY_DONE; - - return NOTIFY_OK; -} - -static int cpu_pmu_init(struct arm_pmu *cpu_pmu) -{ - int err; - int cpu; - struct pmu_hw_events __percpu *cpu_hw_events; - - cpu_hw_events = alloc_percpu(struct pmu_hw_events); - if (!cpu_hw_events) - return -ENOMEM; - - cpu_pmu->hotplug_nb.notifier_call = cpu_pmu_notify; - err = register_cpu_notifier(&cpu_pmu->hotplug_nb); - if (err) - goto out_hw_events; - - for_each_possible_cpu(cpu) { - struct pmu_hw_events *events = per_cpu_ptr(cpu_hw_events, cpu); - raw_spin_lock_init(&events->pmu_lock); - events->percpu_pmu = cpu_pmu; - } - - cpu_pmu->hw_events = cpu_hw_events; - cpu_pmu->request_irq = cpu_pmu_request_irq; - cpu_pmu->free_irq = cpu_pmu_free_irq; - - /* Ensure the PMU has sane values out of reset. */ - if (cpu_pmu->reset) - on_each_cpu_mask(&cpu_pmu->supported_cpus, cpu_pmu->reset, - cpu_pmu, 1); - - /* If no interrupts available, set the corresponding capability flag */ - if (!platform_get_irq(cpu_pmu->plat_device, 0)) - cpu_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; - - return 0; - -out_hw_events: - free_percpu(cpu_hw_events); - return err; -} - -static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu) -{ - unregister_cpu_notifier(&cpu_pmu->hotplug_nb); - free_percpu(cpu_pmu->hw_events); -} - -/* - * CPU PMU identification and probing. - */ -static int probe_current_pmu(struct arm_pmu *pmu, - const struct pmu_probe_info *info) -{ - int cpu = get_cpu(); - unsigned int cpuid = read_cpuid_id(); - int ret = -ENODEV; - - pr_info("probing PMU on CPU %d\n", cpu); - - for (; info->init != NULL; info++) { - if ((cpuid & info->mask) != info->cpuid) - continue; - ret = info->init(pmu); - break; - } - - put_cpu(); - return ret; -} - -static int of_pmu_irq_cfg(struct arm_pmu *pmu) -{ - int *irqs, i = 0; - bool using_spi = false; - struct platform_device *pdev = pmu->plat_device; - - irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL); - if (!irqs) - return -ENOMEM; - - do { - struct device_node *dn; - int cpu, irq; - - /* See if we have an affinity entry */ - dn = of_parse_phandle(pdev->dev.of_node, "interrupt-affinity", i); - if (!dn) - break; - - /* Check the IRQ type and prohibit a mix of PPIs and SPIs */ - irq = platform_get_irq(pdev, i); - if (irq >= 0) { - bool spi = !irq_is_percpu(irq); - - if (i > 0 && spi != using_spi) { - pr_err("PPI/SPI IRQ type mismatch for %s!\n", - dn->name); - kfree(irqs); - return -EINVAL; - } - - using_spi = spi; - } - - /* Now look up the logical CPU number */ - for_each_possible_cpu(cpu) - if (dn == of_cpu_device_node_get(cpu)) - break; - - if (cpu >= nr_cpu_ids) { - pr_warn("Failed to find logical CPU for %s\n", - dn->name); - of_node_put(dn); - cpumask_setall(&pmu->supported_cpus); - break; - } - of_node_put(dn); - - /* For SPIs, we need to track the affinity per IRQ */ - if (using_spi) { - if (i >= pdev->num_resources) { - of_node_put(dn); - break; - } - - irqs[i] = cpu; - } - - /* Keep track of the CPUs containing this PMU type */ - cpumask_set_cpu(cpu, &pmu->supported_cpus); - of_node_put(dn); - i++; - } while (1); - - /* If we didn't manage to parse anything, claim to support all CPUs */ - if (cpumask_weight(&pmu->supported_cpus) == 0) - cpumask_setall(&pmu->supported_cpus); - - /* If we matched up the IRQ affinities, use them to route the SPIs */ - if (using_spi && i == pdev->num_resources) - pmu->irq_affinity = irqs; - else - kfree(irqs); - - return 0; -} - -int arm_pmu_device_probe(struct platform_device *pdev, - const struct of_device_id *of_table, - const struct pmu_probe_info *probe_table) -{ - const struct of_device_id *of_id; - const int (*init_fn)(struct arm_pmu *); - struct device_node *node = pdev->dev.of_node; - struct arm_pmu *pmu; - int ret = -ENODEV; - - pmu = kzalloc(sizeof(struct arm_pmu), GFP_KERNEL); - if (!pmu) { - pr_info("failed to allocate PMU device!\n"); - return -ENOMEM; - } - - if (!__oprofile_cpu_pmu) - __oprofile_cpu_pmu = pmu; - - pmu->plat_device = pdev; - - if (node && (of_id = of_match_node(of_table, pdev->dev.of_node))) { - init_fn = of_id->data; - - ret = of_pmu_irq_cfg(pmu); - if (!ret) - ret = init_fn(pmu); - } else { - ret = probe_current_pmu(pmu, probe_table); - cpumask_setall(&pmu->supported_cpus); - } - - if (ret) { - pr_info("failed to probe PMU!\n"); - goto out_free; - } - - ret = cpu_pmu_init(pmu); - if (ret) - goto out_free; - - ret = armpmu_register(pmu, -1); - if (ret) - goto out_destroy; - - return 0; - -out_destroy: - cpu_pmu_destroy(pmu); -out_free: - pr_info("failed to register PMU devices!\n"); - kfree(pmu); - return ret; -} diff --git a/arch/arm/kernel/perf_event_v6.c b/arch/arm/kernel/perf_event_v6.c index 09f83e414a72..09413e7b49aa 100644 --- a/arch/arm/kernel/perf_event_v6.c +++ b/arch/arm/kernel/perf_event_v6.c @@ -34,9 +34,9 @@ #include <asm/cputype.h> #include <asm/irq_regs.h> -#include <asm/pmu.h> #include <linux/of.h> +#include <linux/perf/arm_pmu.h> #include <linux/platform_device.h> enum armv6_perf_types { diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c index f9b37f876e20..126dc679b230 100644 --- a/arch/arm/kernel/perf_event_v7.c +++ b/arch/arm/kernel/perf_event_v7.c @@ -21,11 +21,11 @@ #include <asm/cp15.h> #include <asm/cputype.h> #include <asm/irq_regs.h> -#include <asm/pmu.h> #include <asm/vfp.h> #include "../vfp/vfpinstr.h" #include <linux/of.h> +#include <linux/perf/arm_pmu.h> #include <linux/platform_device.h> /* diff --git a/arch/arm/kernel/perf_event_xscale.c b/arch/arm/kernel/perf_event_xscale.c index 304d056d5b25..aa0499e2eef7 100644 --- a/arch/arm/kernel/perf_event_xscale.c +++ b/arch/arm/kernel/perf_event_xscale.c @@ -16,9 +16,9 @@ #include <asm/cputype.h> #include <asm/irq_regs.h> -#include <asm/pmu.h> #include <linux/of.h> +#include <linux/perf/arm_pmu.h> #include <linux/platform_device.h> enum xscale_perf_types { diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c index 16913800bbf9..5578dc1ab52b 100644 --- a/arch/arm/mach-ux500/cpu-db8500.c +++ b/arch/arm/mach-ux500/cpu-db8500.c @@ -20,10 +20,10 @@ #include <linux/mfd/dbx500-prcmu.h> #include <linux/of.h> #include <linux/of_platform.h> +#include <linux/perf/arm_pmu.h> #include <linux/regulator/machine.h> #include <linux/random.h> -#include <asm/pmu.h> #include <asm/mach/map.h> #include "setup.h" |