arm: perf: unify perf_event{,_cpu}.c
Now that the arm_pmu framework is only used for CPU PMUs, there's no reason to keep the pseudo-generic and CPU-specific framework portions separate. This patch folds the two into perf_event.c. Signed-off-by: Mark Rutland <mark.rutland@arm.com> [will: fixed up irq cfg to match upstream] Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland
Will Deacon
parent
29ba0f37f1
commit
74cf0bc75f
|
|
@ -70,7 +70,7 @@ 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-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o \
|
||||
obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o \
|
||||
perf_event_xscale.o perf_event_v6.o \
|
||||
perf_event_v7.o
|
||||
CFLAGS_pj4-cp0.o := -marm
|
||||
|
|
|
|||
|
|
@ -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/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>
|
||||
|
||||
|
|
@ -553,3 +559,337 @@ int armpmu_register(struct arm_pmu *armpmu, int type)
|
|||
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;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,363 +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 *__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;
|
||||
struct platform_device *pdev = pmu->plat_device;
|
||||
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;
|
||||
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;
|
||||
}
|
||||
Loading…
Reference in New Issue