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Merge branch 'for-rmk/perf' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into devel-stable 

There's quite a lot here, most of it from Mark Rutland, who has been
working on big.LITTLE PMU support for a while now. His work also brings
us significantly closer to moving the bulk of the CPU PMU driver out
into drivers/, where it can be shared with arm64.

As part of this work, there is a small patch to perf/core, which has
been Acked-by PeterZ and doesn't conflict with tip/perf/core at present.
I've kept that patch on a separate branch, merged in here, so that the
tip guys can pull it too if any unexpected issues crop up.

Please note that there is a conflict with mainline, since we remove
perf_event_cpu.c. The correct resolution is also to remove the file,
since the changes there are already reflected in the rework (and this
resolution is already included in linux-next).
This commit is contained in:
Russell King 2015-06-06 01:20:54 +01:00
Родитель 4c9e0f76a5 74cf0bc75f
Коммит bcc8fa8313
10 изменённых файлов: 530 добавлений и 552 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

7
arch/arm/include/asm/perf_event.h
Просмотреть файл

@ -19,4 +19,11 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs);
#define perf_misc_flags(regs) perf_misc_flags(regs)
#endif
#define perf_arch_fetch_caller_regs(regs, __ip) { \
(regs)->ARM_pc = (__ip); \
(regs)->ARM_fp = (unsigned long) __builtin_frame_address(0); \
(regs)->ARM_sp = current_stack_pointer; \
(regs)->ARM_cpsr = SVC_MODE; \
}
#endif /* __ARM_PERF_EVENT_H__ */

19
arch/arm/include/asm/pmu.h
Просмотреть файл

@ -24,22 +24,10 @@
* 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.
* @runtime_resume: an optional handler which will be called by the
* runtime PM framework following a call to pm_runtime_get().
* Note that if pm_runtime_get() is called more than once in
* succession this handler will only be called once.
* @runtime_suspend: an optional handler which will be called by the
* runtime PM framework following a call to pm_runtime_put().
* Note that if pm_runtime_get() is called more than once in
* succession this handler will only be called following the
* final call to pm_runtime_put() that actually disables the
* hardware.
*/
struct arm_pmu_platdata {
irqreturn_t (*handle_irq)(int irq, void *dev,
irq_handler_t pmu_handler);
int (*runtime_resume)(struct device *dev);
int (*runtime_suspend)(struct device *dev);
};
#ifdef CONFIG_HW_PERF_EVENTS
@ -92,6 +80,7 @@ struct pmu_hw_events {
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);
@ -122,8 +111,6 @@ struct arm_pmu {
#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
extern const struct dev_pm_ops armpmu_dev_pm_ops;
int armpmu_register(struct arm_pmu *armpmu, int type);
u64 armpmu_event_update(struct perf_event *event);
@ -158,6 +145,10 @@ struct pmu_probe_info {
#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__ */

4
arch/arm/kernel/Makefile
Просмотреть файл

@ -70,7 +70,9 @@ 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-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o
obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o \
perf_event_xscale.o perf_event_v6.o \
perf_event_v7.o
CFLAGS_pj4-cp0.o := -marm
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o

410
arch/arm/kernel/perf_event.c
Просмотреть файл

@ -11,12 +11,18 @@
*/
#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.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.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>
@ -229,6 +235,10 @@ armpmu_add(struct perf_event *event, int flags)
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. */
@ -344,20 +354,12 @@ static void
armpmu_release_hardware(struct arm_pmu *armpmu)
{
armpmu->free_irq(armpmu);
pm_runtime_put_sync(&armpmu->plat_device->dev);
}
static int
armpmu_reserve_hardware(struct arm_pmu *armpmu)
{
int err;
struct platform_device *pmu_device = armpmu->plat_device;
if (!pmu_device)
return -ENODEV;
pm_runtime_get_sync(&pmu_device->dev);
err = armpmu->request_irq(armpmu, armpmu_dispatch_irq);
int err = armpmu->request_irq(armpmu, armpmu_dispatch_irq);
if (err) {
armpmu_release_hardware(armpmu);
return err;
@ -454,6 +456,17 @@ static int armpmu_event_init(struct perf_event *event)
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;
@ -489,6 +502,10 @@ static void armpmu_enable(struct 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);
}
@ -496,35 +513,26 @@ static void armpmu_enable(struct pmu *pmu)
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);
}
#ifdef CONFIG_PM
static int armpmu_runtime_resume(struct device *dev)
/*
* 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_platdata *plat = dev_get_platdata(dev);
if (plat && plat->runtime_resume)
return plat->runtime_resume(dev);
return 0;
struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
unsigned int cpu = smp_processor_id();
return cpumask_test_cpu(cpu, &armpmu->supported_cpus);
}
static int armpmu_runtime_suspend(struct device *dev)
{
struct arm_pmu_platdata *plat = dev_get_platdata(dev);
if (plat && plat->runtime_suspend)
return plat->runtime_suspend(dev);
return 0;
}
#endif
const struct dev_pm_ops armpmu_dev_pm_ops = {
SET_RUNTIME_PM_OPS(armpmu_runtime_suspend, armpmu_runtime_resume, NULL)
};
static void armpmu_init(struct arm_pmu *armpmu)
{
atomic_set(&armpmu->active_events, 0);
@ -539,15 +547,349 @@ static void armpmu_init(struct arm_pmu *armpmu)
.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);
pm_runtime_enable(&armpmu->plat_device->dev);
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 i, irq, *irqs;
struct platform_device *pdev = pmu->plat_device;
/* Don't bother with PPIs; they're already affine */
irq = platform_get_irq(pdev, 0);
if (irq >= 0 && irq_is_percpu(irq))
return 0;
irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL);
if (!irqs)
return -ENOMEM;
for (i = 0; i < pdev->num_resources; ++i) {
struct device_node *dn;
int cpu;
dn = of_parse_phandle(pdev->dev.of_node, "interrupt-affinity",
i);
if (!dn) {
pr_warn("Failed to parse %s/interrupt-affinity[%d]\n",
of_node_full_name(pdev->dev.of_node), i);
break;
}
for_each_possible_cpu(cpu)
if (arch_find_n_match_cpu_physical_id(dn, cpu, NULL))
break;
of_node_put(dn);
if (cpu >= nr_cpu_ids) {
pr_warn("Failed to find logical CPU for %s\n",
dn->name);
break;
}
irqs[i] = cpu;
cpumask_set_cpu(cpu, &pmu->supported_cpus);
}
if (i == pdev->num_resources) {
pmu->irq_affinity = irqs;
} else {
kfree(irqs);
cpumask_setall(&pmu->supported_cpus);
}
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;
}

415
arch/arm/kernel/perf_event_cpu.c
Просмотреть файл

@ -1,415 +0,0 @@
/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2012 ARM Limited
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#define pr_fmt(fmt) "CPU PMU: " fmt
#include <linux/bitmap.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/of.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>
/* Set at runtime when we know what CPU type we are. */
static struct arm_pmu *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 (!cpu_pmu)
return NULL;
return cpu_pmu->name;
}
EXPORT_SYMBOL_GPL(perf_pmu_name);
int perf_num_counters(void)
{
int max_events = 0;
if (cpu_pmu != NULL)
max_events = cpu_pmu->num_events;
return max_events;
}
EXPORT_SYMBOL_GPL(perf_num_counters);
/* Include the PMU-specific implementations. */
#include "perf_event_xscale.c"
#include "perf_event_v6.c"
#include "perf_event_v7.c"
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)
{
struct arm_pmu *pmu = container_of(b, struct arm_pmu, hotplug_nb);
if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING)
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(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);
}
/*
* PMU platform driver and devicetree bindings.
*/
static const struct of_device_id cpu_pmu_of_device_ids[] = {
{.compatible = "arm,cortex-a17-pmu", .data = armv7_a17_pmu_init},
{.compatible = "arm,cortex-a15-pmu", .data = armv7_a15_pmu_init},
{.compatible = "arm,cortex-a12-pmu", .data = armv7_a12_pmu_init},
{.compatible = "arm,cortex-a9-pmu", .data = armv7_a9_pmu_init},
{.compatible = "arm,cortex-a8-pmu", .data = armv7_a8_pmu_init},
{.compatible = "arm,cortex-a7-pmu", .data = armv7_a7_pmu_init},
{.compatible = "arm,cortex-a5-pmu", .data = armv7_a5_pmu_init},
{.compatible = "arm,arm11mpcore-pmu", .data = armv6mpcore_pmu_init},
{.compatible = "arm,arm1176-pmu", .data = armv6_1176_pmu_init},
{.compatible = "arm,arm1136-pmu", .data = armv6_1136_pmu_init},
{.compatible = "qcom,krait-pmu", .data = krait_pmu_init},
{.compatible = "qcom,scorpion-pmu", .data = scorpion_pmu_init},
{.compatible = "qcom,scorpion-mp-pmu", .data = scorpion_mp_pmu_init},
{},
};
static struct platform_device_id cpu_pmu_plat_device_ids[] = {
{.name = "arm-pmu"},
{.name = "armv6-pmu"},
{.name = "armv7-pmu"},
{.name = "xscale-pmu"},
{},
};
static const struct pmu_probe_info pmu_probe_table[] = {
ARM_PMU_PROBE(ARM_CPU_PART_ARM1136, armv6_1136_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_ARM1156, armv6_1156_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_ARM1176, armv6_1176_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_ARM11MPCORE, armv6mpcore_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_CORTEX_A8, armv7_a8_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_CORTEX_A9, armv7_a9_pmu_init),
XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V1, xscale1pmu_init),
XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V2, xscale2pmu_init),
{ /* sentinel value */ }
};
/*
* CPU PMU identification and probing.
*/
static int probe_current_pmu(struct arm_pmu *pmu)
{
int cpu = get_cpu();
unsigned int cpuid = read_cpuid_id();
int ret = -ENODEV;
const struct pmu_probe_info *info;
pr_info("probing PMU on CPU %d\n", cpu);
for (info = pmu_probe_table; 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 platform_device *pdev)
{
int i;
int *irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL);
if (!irqs)
return -ENOMEM;
for (i = 0; i < pdev->num_resources; ++i) {
struct device_node *dn;
int cpu;
dn = of_parse_phandle(pdev->dev.of_node, "interrupt-affinity",
i);
if (!dn) {
pr_warn("Failed to parse %s/interrupt-affinity[%d]\n",
of_node_full_name(dn), i);
break;
}
for_each_possible_cpu(cpu)
if (arch_find_n_match_cpu_physical_id(dn, cpu, NULL))
break;
of_node_put(dn);
if (cpu >= nr_cpu_ids) {
pr_warn("Failed to find logical CPU for %s\n",
dn->name);
break;
}
irqs[i] = cpu;
}
if (i == pdev->num_resources)
cpu_pmu->irq_affinity = irqs;
else
kfree(irqs);
return 0;
}
static int cpu_pmu_device_probe(struct platform_device *pdev)
{
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;
if (cpu_pmu) {
pr_info("attempt to register multiple PMU devices!\n");
return -ENOSPC;
}
pmu = kzalloc(sizeof(struct arm_pmu), GFP_KERNEL);
if (!pmu) {
pr_info("failed to allocate PMU device!\n");
return -ENOMEM;
}
cpu_pmu = pmu;
cpu_pmu->plat_device = pdev;
if (node && (of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node))) {
init_fn = of_id->data;
ret = of_pmu_irq_cfg(pdev);
if (!ret)
ret = init_fn(pmu);
} else {
ret = probe_current_pmu(pmu);
}
if (ret) {
pr_info("failed to probe PMU!\n");
goto out_free;
}
ret = cpu_pmu_init(cpu_pmu);
if (ret)
goto out_free;
ret = armpmu_register(cpu_pmu, -1);
if (ret)
goto out_destroy;
return 0;
out_destroy:
cpu_pmu_destroy(cpu_pmu);
out_free:
pr_info("failed to register PMU devices!\n");
kfree(pmu);
return ret;
}
static struct platform_driver cpu_pmu_driver = {
.driver = {
.name = "arm-pmu",
.pm = &armpmu_dev_pm_ops,
.of_match_table = cpu_pmu_of_device_ids,
},
.probe = cpu_pmu_device_probe,
.id_table = cpu_pmu_plat_device_ids,
};
static int __init register_pmu_driver(void)
{
return platform_driver_register(&cpu_pmu_driver);
}
device_initcall(register_pmu_driver);

51
arch/arm/kernel/perf_event_v6.c
Просмотреть файл

@ -31,6 +31,14 @@
*/
#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
#include <asm/cputype.h>
#include <asm/irq_regs.h>
#include <asm/pmu.h>
#include <linux/of.h>
#include <linux/platform_device.h>
enum armv6_perf_types {
ARMV6_PERFCTR_ICACHE_MISS = 0x0,
ARMV6_PERFCTR_IBUF_STALL = 0x1,
@ -543,24 +551,39 @@ static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
return 0;
}
#else
static int armv6_1136_pmu_init(struct arm_pmu *cpu_pmu)
static struct of_device_id armv6_pmu_of_device_ids[] = {
{.compatible = "arm,arm11mpcore-pmu", .data = armv6mpcore_pmu_init},
{.compatible = "arm,arm1176-pmu", .data = armv6_1176_pmu_init},
{.compatible = "arm,arm1136-pmu", .data = armv6_1136_pmu_init},
{ /* sentinel value */ }
};
static const struct pmu_probe_info armv6_pmu_probe_table[] = {
ARM_PMU_PROBE(ARM_CPU_PART_ARM1136, armv6_1136_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_ARM1156, armv6_1156_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_ARM1176, armv6_1176_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_ARM11MPCORE, armv6mpcore_pmu_init),
{ /* sentinel value */ }
};
static int armv6_pmu_device_probe(struct platform_device *pdev)
{
return -ENODEV;
return arm_pmu_device_probe(pdev, armv6_pmu_of_device_ids,
armv6_pmu_probe_table);
}
static int armv6_1156_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static struct platform_driver armv6_pmu_driver = {
.driver = {
.name = "armv6-pmu",
.of_match_table = armv6_pmu_of_device_ids,
},
.probe = armv6_pmu_device_probe,
};
static int armv6_1176_pmu_init(struct arm_pmu *cpu_pmu)
static int __init register_armv6_pmu_driver(void)
{
return -ENODEV;
}
static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
return platform_driver_register(&armv6_pmu_driver);
}
device_initcall(register_armv6_pmu_driver);
#endif /* CONFIG_CPU_V6 || CONFIG_CPU_V6K */

131
arch/arm/kernel/perf_event_v7.c
Просмотреть файл

@ -19,9 +19,15 @@
#ifdef CONFIG_CPU_V7
#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/platform_device.h>
/*
* Common ARMv7 event types
*
@ -1056,15 +1062,22 @@ static void armv7pmu_init(struct arm_pmu *cpu_pmu)
cpu_pmu->max_period = (1LLU << 32) - 1;
};
static u32 armv7_read_num_pmnc_events(void)
static void armv7_read_num_pmnc_events(void *info)
{
u32 nb_cnt;
int *nb_cnt = info;
/* Read the nb of CNTx counters supported from PMNC */
nb_cnt = (armv7_pmnc_read() >> ARMV7_PMNC_N_SHIFT) & ARMV7_PMNC_N_MASK;
*nb_cnt = (armv7_pmnc_read() >> ARMV7_PMNC_N_SHIFT) & ARMV7_PMNC_N_MASK;
/* Add the CPU cycles counter and return */
return nb_cnt + 1;
/* Add the CPU cycles counter */
*nb_cnt += 1;
}
static int armv7_probe_num_events(struct arm_pmu *arm_pmu)
{
return smp_call_function_any(&arm_pmu->supported_cpus,
armv7_read_num_pmnc_events,
&arm_pmu->num_events, 1);
}
static int armv7_a8_pmu_init(struct arm_pmu *cpu_pmu)
@ -1072,8 +1085,7 @@ static int armv7_a8_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a8";
cpu_pmu->map_event = armv7_a8_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int armv7_a9_pmu_init(struct arm_pmu *cpu_pmu)
@ -1081,8 +1093,7 @@ static int armv7_a9_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a9";
cpu_pmu->map_event = armv7_a9_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int armv7_a5_pmu_init(struct arm_pmu *cpu_pmu)
@ -1090,8 +1101,7 @@ static int armv7_a5_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a5";
cpu_pmu->map_event = armv7_a5_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int armv7_a15_pmu_init(struct arm_pmu *cpu_pmu)
@ -1099,9 +1109,8 @@ static int armv7_a15_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a15";
cpu_pmu->map_event = armv7_a15_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
cpu_pmu->set_event_filter = armv7pmu_set_event_filter;
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int armv7_a7_pmu_init(struct arm_pmu *cpu_pmu)
@ -1109,9 +1118,8 @@ static int armv7_a7_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a7";
cpu_pmu->map_event = armv7_a7_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
cpu_pmu->set_event_filter = armv7pmu_set_event_filter;
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int armv7_a12_pmu_init(struct arm_pmu *cpu_pmu)
@ -1119,16 +1127,15 @@ static int armv7_a12_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a12";
cpu_pmu->map_event = armv7_a12_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
cpu_pmu->set_event_filter = armv7pmu_set_event_filter;
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int armv7_a17_pmu_init(struct arm_pmu *cpu_pmu)
{
armv7_a12_pmu_init(cpu_pmu);
int ret = armv7_a12_pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_cortex_a17";
return 0;
return ret;
}
/*
@ -1508,14 +1515,13 @@ static int krait_pmu_init(struct arm_pmu *cpu_pmu)
cpu_pmu->map_event = krait_map_event_no_branch;
else
cpu_pmu->map_event = krait_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
cpu_pmu->set_event_filter = armv7pmu_set_event_filter;
cpu_pmu->reset = krait_pmu_reset;
cpu_pmu->enable = krait_pmu_enable_event;
cpu_pmu->disable = krait_pmu_disable_event;
cpu_pmu->get_event_idx = krait_pmu_get_event_idx;
cpu_pmu->clear_event_idx = krait_pmu_clear_event_idx;
return 0;
return armv7_probe_num_events(cpu_pmu);
}
/*
@ -1833,13 +1839,12 @@ static int scorpion_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_scorpion";
cpu_pmu->map_event = scorpion_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
cpu_pmu->reset = scorpion_pmu_reset;
cpu_pmu->enable = scorpion_pmu_enable_event;
cpu_pmu->disable = scorpion_pmu_disable_event;
cpu_pmu->get_event_idx = scorpion_pmu_get_event_idx;
cpu_pmu->clear_event_idx = scorpion_pmu_clear_event_idx;
return 0;
return armv7_probe_num_events(cpu_pmu);
}
static int scorpion_mp_pmu_init(struct arm_pmu *cpu_pmu)
@ -1847,62 +1852,52 @@ static int scorpion_mp_pmu_init(struct arm_pmu *cpu_pmu)
armv7pmu_init(cpu_pmu);
cpu_pmu->name = "armv7_scorpion_mp";
cpu_pmu->map_event = scorpion_map_event;
cpu_pmu->num_events = armv7_read_num_pmnc_events();
cpu_pmu->reset = scorpion_pmu_reset;
cpu_pmu->enable = scorpion_pmu_enable_event;
cpu_pmu->disable = scorpion_pmu_disable_event;
cpu_pmu->get_event_idx = scorpion_pmu_get_event_idx;
cpu_pmu->clear_event_idx = scorpion_pmu_clear_event_idx;
return 0;
}
#else
static inline int armv7_a8_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
return armv7_probe_num_events(cpu_pmu);
}
static inline int armv7_a9_pmu_init(struct arm_pmu *cpu_pmu)
static const struct of_device_id armv7_pmu_of_device_ids[] = {
{.compatible = "arm,cortex-a17-pmu", .data = armv7_a17_pmu_init},
{.compatible = "arm,cortex-a15-pmu", .data = armv7_a15_pmu_init},
{.compatible = "arm,cortex-a12-pmu", .data = armv7_a12_pmu_init},
{.compatible = "arm,cortex-a9-pmu", .data = armv7_a9_pmu_init},
{.compatible = "arm,cortex-a8-pmu", .data = armv7_a8_pmu_init},
{.compatible = "arm,cortex-a7-pmu", .data = armv7_a7_pmu_init},
{.compatible = "arm,cortex-a5-pmu", .data = armv7_a5_pmu_init},
{.compatible = "qcom,krait-pmu", .data = krait_pmu_init},
{.compatible = "qcom,scorpion-pmu", .data = scorpion_pmu_init},
{.compatible = "qcom,scorpion-mp-pmu", .data = scorpion_mp_pmu_init},
{},
};
static const struct pmu_probe_info armv7_pmu_probe_table[] = {
ARM_PMU_PROBE(ARM_CPU_PART_CORTEX_A8, armv7_a8_pmu_init),
ARM_PMU_PROBE(ARM_CPU_PART_CORTEX_A9, armv7_a9_pmu_init),
{ /* sentinel value */ }
};
static int armv7_pmu_device_probe(struct platform_device *pdev)
{
return -ENODEV;
return arm_pmu_device_probe(pdev, armv7_pmu_of_device_ids,
armv7_pmu_probe_table);
}
static inline int armv7_a5_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static struct platform_driver armv7_pmu_driver = {
.driver = {
.name = "armv7-pmu",
.of_match_table = armv7_pmu_of_device_ids,
},
.probe = armv7_pmu_device_probe,
};
static inline int armv7_a15_pmu_init(struct arm_pmu *cpu_pmu)
static int __init register_armv7_pmu_driver(void)
{
return -ENODEV;
}
static inline int armv7_a7_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static inline int armv7_a12_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static inline int armv7_a17_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static inline int krait_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static inline int scorpion_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
}
static inline int scorpion_mp_pmu_init(struct arm_pmu *cpu_pmu)
{
return -ENODEV;
return platform_driver_register(&armv7_pmu_driver);
}
device_initcall(register_armv7_pmu_driver);
#endif /* CONFIG_CPU_V7 */

32
arch/arm/kernel/perf_event_xscale.c
Просмотреть файл

@ -13,6 +13,14 @@
*/
#ifdef CONFIG_CPU_XSCALE
#include <asm/cputype.h>
#include <asm/irq_regs.h>
#include <asm/pmu.h>
#include <linux/of.h>
#include <linux/platform_device.h>
enum xscale_perf_types {
XSCALE_PERFCTR_ICACHE_MISS = 0x00,
XSCALE_PERFCTR_ICACHE_NO_DELIVER = 0x01,
@ -740,14 +748,28 @@ static int xscale2pmu_init(struct arm_pmu *cpu_pmu)
return 0;
}
#else
static inline int xscale1pmu_init(struct arm_pmu *cpu_pmu)
static const struct pmu_probe_info xscale_pmu_probe_table[] = {
XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V1, xscale1pmu_init),
XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V2, xscale2pmu_init),
{ /* sentinel value */ }
};
static int xscale_pmu_device_probe(struct platform_device *pdev)
{
return -ENODEV;
return arm_pmu_device_probe(pdev, NULL, xscale_pmu_probe_table);
}
static inline int xscale2pmu_init(struct arm_pmu *cpu_pmu)
static struct platform_driver xscale_pmu_driver = {
.driver = {
.name = "xscale-pmu",
},
.probe = xscale_pmu_device_probe,
};
static int __init register_xscale_pmu_driver(void)
{
return -ENODEV;
return platform_driver_register(&xscale_pmu_driver);
}
device_initcall(register_xscale_pmu_driver);
#endif /* CONFIG_CPU_XSCALE */

5
include/linux/perf_event.h
Просмотреть файл

@ -304,6 +304,11 @@ struct pmu {
* Free pmu-private AUX data structures
*/
void (*free_aux) (void *aux); /* optional */
/*
* Filter events for PMU-specific reasons.
*/
int (*filter_match) (struct perf_event *event); /* optional */
};
/**

8
kernel/events/core.c
Просмотреть файл

@ -1506,11 +1506,17 @@ static int __init perf_workqueue_init(void)
core_initcall(perf_workqueue_init);
static inline int pmu_filter_match(struct perf_event *event)
{
struct pmu *pmu = event->pmu;
return pmu->filter_match ? pmu->filter_match(event) : 1;
}
static inline int
event_filter_match(struct perf_event *event)
{
return (event->cpu == -1 || event->cpu == smp_processor_id())
&& perf_cgroup_match(event);
&& perf_cgroup_match(event) && pmu_filter_match(event);
}
static void