ARM: 6064/1: pmu: register IRQs at runtime
The current PMU infrastructure for ARM requires that the IRQs for the PMU device are fixed at compile time and are selected based on the ARCH_ or MACH_ flags. This has the disadvantage of tying the Kernel down to a particular board as far as profiling is concerned. This patch replaces the compile-time IRQ registration with a runtime mechanism which allows the IRQs to be registered with the framework as a platform_device. A further advantage of this change is that there is scope for registering different types of performance counters in the future by changing the id of the platform_device and attaching different resources to it. Acked-by: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon
Russell King
Родитель
c39e52a793
Коммит
49c006b937
|
|
@ -19,31 +19,26 @@ enum arm_pmu_type {
|
|||
|
||||
#ifdef CONFIG_CPU_HAS_PMU
|
||||
|
||||
struct pmu_irqs {
|
||||
const int *irqs;
|
||||
int num_irqs;
|
||||
};
|
||||
|
||||
/**
|
||||
* reserve_pmu() - reserve the hardware performance counters
|
||||
*
|
||||
* Reserve the hardware performance counters in the system for exclusive use.
|
||||
* The 'struct pmu_irqs' for the system is returned on success, ERR_PTR()
|
||||
* The platform_device for the system is returned on success, ERR_PTR()
|
||||
* encoded error on failure.
|
||||
*/
|
||||
extern const struct pmu_irqs *
|
||||
reserve_pmu(void);
|
||||
extern struct platform_device *
|
||||
reserve_pmu(enum arm_pmu_type device);
|
||||
|
||||
/**
|
||||
* release_pmu() - Relinquish control of the performance counters
|
||||
*
|
||||
* Release the performance counters and allow someone else to use them.
|
||||
* Callers must have disabled the counters and released IRQs before calling
|
||||
* this. The 'struct pmu_irqs' returned from reserve_pmu() must be passed as
|
||||
* this. The platform_device returned from reserve_pmu() must be passed as
|
||||
* a cookie.
|
||||
*/
|
||||
extern int
|
||||
release_pmu(const struct pmu_irqs *irqs);
|
||||
release_pmu(struct platform_device *pdev);
|
||||
|
||||
/**
|
||||
* init_pmu() - Initialise the PMU.
|
||||
|
|
@ -53,24 +48,26 @@ release_pmu(const struct pmu_irqs *irqs);
|
|||
* the actual hardware initialisation.
|
||||
*/
|
||||
extern int
|
||||
init_pmu(void);
|
||||
init_pmu(enum arm_pmu_type device);
|
||||
|
||||
#else /* CONFIG_CPU_HAS_PMU */
|
||||
|
||||
static inline const struct pmu_irqs *
|
||||
reserve_pmu(void)
|
||||
#include <linux/err.h>
|
||||
|
||||
static inline struct platform_device *
|
||||
reserve_pmu(enum arm_pmu_type device)
|
||||
{
|
||||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
static inline int
|
||||
release_pmu(const struct pmu_irqs *irqs)
|
||||
release_pmu(struct platform_device *pdev)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int
|
||||
init_pmu(void)
|
||||
init_pmu(enum arm_pmu_type device)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -17,6 +17,7 @@
|
|||
#include <linux/interrupt.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/perf_event.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
|
|
@ -26,7 +27,7 @@
|
|||
#include <asm/pmu.h>
|
||||
#include <asm/stacktrace.h>
|
||||
|
||||
static const struct pmu_irqs *pmu_irqs;
|
||||
static struct platform_device *pmu_device;
|
||||
|
||||
/*
|
||||
* Hardware lock to serialize accesses to PMU registers. Needed for the
|
||||
|
|
@ -314,38 +315,44 @@ validate_group(struct perf_event *event)
|
|||
static int
|
||||
armpmu_reserve_hardware(void)
|
||||
{
|
||||
int i;
|
||||
int err;
|
||||
int i, err = -ENODEV, irq;
|
||||
|
||||
pmu_irqs = reserve_pmu();
|
||||
if (IS_ERR(pmu_irqs)) {
|
||||
pmu_device = reserve_pmu(ARM_PMU_DEVICE_CPU);
|
||||
if (IS_ERR(pmu_device)) {
|
||||
pr_warning("unable to reserve pmu\n");
|
||||
return PTR_ERR(pmu_irqs);
|
||||
return PTR_ERR(pmu_device);
|
||||
}
|
||||
|
||||
init_pmu();
|
||||
init_pmu(ARM_PMU_DEVICE_CPU);
|
||||
|
||||
if (pmu_irqs->num_irqs < 1) {
|
||||
if (pmu_device->num_resources < 1) {
|
||||
pr_err("no irqs for PMUs defined\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
for (i = 0; i < pmu_irqs->num_irqs; ++i) {
|
||||
err = request_irq(pmu_irqs->irqs[i], armpmu->handle_irq,
|
||||
for (i = 0; i < pmu_device->num_resources; ++i) {
|
||||
irq = platform_get_irq(pmu_device, i);
|
||||
if (irq < 0)
|
||||
continue;
|
||||
|
||||
err = request_irq(irq, armpmu->handle_irq,
|
||||
IRQF_DISABLED | IRQF_NOBALANCING,
|
||||
"armpmu", NULL);
|
||||
if (err) {
|
||||
pr_warning("unable to request IRQ%d for ARM "
|
||||
"perf counters\n", pmu_irqs->irqs[i]);
|
||||
pr_warning("unable to request IRQ%d for ARM perf "
|
||||
"counters\n", irq);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (err) {
|
||||
for (i = i - 1; i >= 0; --i)
|
||||
free_irq(pmu_irqs->irqs[i], NULL);
|
||||
release_pmu(pmu_irqs);
|
||||
pmu_irqs = NULL;
|
||||
for (i = i - 1; i >= 0; --i) {
|
||||
irq = platform_get_irq(pmu_device, i);
|
||||
if (irq >= 0)
|
||||
free_irq(irq, NULL);
|
||||
}
|
||||
release_pmu(pmu_device);
|
||||
pmu_device = NULL;
|
||||
}
|
||||
|
||||
return err;
|
||||
|
|
@ -354,14 +361,17 @@ armpmu_reserve_hardware(void)
|
|||
static void
|
||||
armpmu_release_hardware(void)
|
||||
{
|
||||
int i;
|
||||
int i, irq;
|
||||
|
||||
for (i = pmu_irqs->num_irqs - 1; i >= 0; --i)
|
||||
free_irq(pmu_irqs->irqs[i], NULL);
|
||||
for (i = pmu_device->num_resources - 1; i >= 0; --i) {
|
||||
irq = platform_get_irq(pmu_device, i);
|
||||
if (irq >= 0)
|
||||
free_irq(irq, NULL);
|
||||
}
|
||||
armpmu->stop();
|
||||
|
||||
release_pmu(pmu_irqs);
|
||||
pmu_irqs = NULL;
|
||||
release_pmu(pmu_device);
|
||||
pmu_device = NULL;
|
||||
}
|
||||
|
||||
static atomic_t active_events = ATOMIC_INIT(0);
|
||||
|
|
|
|||
|
|
@ -2,6 +2,7 @@
|
|||
* linux/arch/arm/kernel/pmu.c
|
||||
*
|
||||
* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
|
||||
* Copyright (C) 2010 ARM Ltd, Will Deacon
|
||||
*
|
||||
* 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
|
||||
|
|
@ -9,65 +10,78 @@
|
|||
*
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "PMU: " fmt
|
||||
|
||||
#include <linux/cpumask.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
#include <asm/pmu.h>
|
||||
|
||||
/*
|
||||
* Define the IRQs for the system. We could use something like a platform
|
||||
* device but that seems fairly heavyweight for this. Also, the performance
|
||||
* counters can't be removed or hotplugged.
|
||||
*
|
||||
* Ordering is important: init_pmu() will use the ordering to set the affinity
|
||||
* to the corresponding core. e.g. the first interrupt will go to cpu 0, the
|
||||
* second goes to cpu 1 etc.
|
||||
*/
|
||||
static const int irqs[] = {
|
||||
#if defined(CONFIG_ARCH_OMAP2)
|
||||
3,
|
||||
#elif defined(CONFIG_ARCH_BCMRING)
|
||||
IRQ_PMUIRQ,
|
||||
#elif defined(CONFIG_MACH_REALVIEW_EB)
|
||||
IRQ_EB11MP_PMU_CPU0,
|
||||
IRQ_EB11MP_PMU_CPU1,
|
||||
IRQ_EB11MP_PMU_CPU2,
|
||||
IRQ_EB11MP_PMU_CPU3,
|
||||
#elif defined(CONFIG_ARCH_OMAP3)
|
||||
INT_34XX_BENCH_MPU_EMUL,
|
||||
#elif defined(CONFIG_ARCH_IOP32X)
|
||||
IRQ_IOP32X_CORE_PMU,
|
||||
#elif defined(CONFIG_ARCH_IOP33X)
|
||||
IRQ_IOP33X_CORE_PMU,
|
||||
#elif defined(CONFIG_ARCH_PXA)
|
||||
IRQ_PMU,
|
||||
#endif
|
||||
};
|
||||
|
||||
static const struct pmu_irqs pmu_irqs = {
|
||||
.irqs = irqs,
|
||||
.num_irqs = ARRAY_SIZE(irqs),
|
||||
};
|
||||
|
||||
static volatile long pmu_lock;
|
||||
|
||||
const struct pmu_irqs *
|
||||
reserve_pmu(void)
|
||||
static struct platform_device *pmu_devices[ARM_NUM_PMU_DEVICES];
|
||||
|
||||
static int __devinit pmu_device_probe(struct platform_device *pdev)
|
||||
{
|
||||
return test_and_set_bit_lock(0, &pmu_lock) ? ERR_PTR(-EBUSY) :
|
||||
&pmu_irqs;
|
||||
|
||||
if (pdev->id < 0 || pdev->id >= ARM_NUM_PMU_DEVICES) {
|
||||
pr_warning("received registration request for unknown "
|
||||
"device %d\n", pdev->id);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (pmu_devices[pdev->id])
|
||||
pr_warning("registering new PMU device type %d overwrites "
|
||||
"previous registration!\n", pdev->id);
|
||||
else
|
||||
pr_info("registered new PMU device of type %d\n",
|
||||
pdev->id);
|
||||
|
||||
pmu_devices[pdev->id] = pdev;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver pmu_driver = {
|
||||
.driver = {
|
||||
.name = "arm-pmu",
|
||||
},
|
||||
.probe = pmu_device_probe,
|
||||
};
|
||||
|
||||
static int __init register_pmu_driver(void)
|
||||
{
|
||||
return platform_driver_register(&pmu_driver);
|
||||
}
|
||||
device_initcall(register_pmu_driver);
|
||||
|
||||
struct platform_device *
|
||||
reserve_pmu(enum arm_pmu_type device)
|
||||
{
|
||||
struct platform_device *pdev;
|
||||
|
||||
if (test_and_set_bit_lock(device, &pmu_lock)) {
|
||||
pdev = ERR_PTR(-EBUSY);
|
||||
} else if (pmu_devices[device] == NULL) {
|
||||
clear_bit_unlock(device, &pmu_lock);
|
||||
pdev = ERR_PTR(-ENODEV);
|
||||
} else {
|
||||
pdev = pmu_devices[device];
|
||||
}
|
||||
|
||||
return pdev;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(reserve_pmu);
|
||||
|
||||
int
|
||||
release_pmu(const struct pmu_irqs *irqs)
|
||||
release_pmu(struct platform_device *pdev)
|
||||
{
|
||||
if (WARN_ON(irqs != &pmu_irqs))
|
||||
if (WARN_ON(pdev != pmu_devices[pdev->id]))
|
||||
return -EINVAL;
|
||||
clear_bit_unlock(0, &pmu_lock);
|
||||
clear_bit_unlock(pdev->id, &pmu_lock);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(release_pmu);
|
||||
|
|
@ -87,17 +101,42 @@ set_irq_affinity(int irq,
|
|||
#endif
|
||||
}
|
||||
|
||||
int
|
||||
init_pmu(void)
|
||||
static int
|
||||
init_cpu_pmu(void)
|
||||
{
|
||||
int i, err = 0;
|
||||
struct platform_device *pdev = pmu_devices[ARM_PMU_DEVICE_CPU];
|
||||
|
||||
for (i = 0; i < pmu_irqs.num_irqs; ++i) {
|
||||
err = set_irq_affinity(pmu_irqs.irqs[i], i);
|
||||
if (!pdev) {
|
||||
err = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
for (i = 0; i < pdev->num_resources; ++i) {
|
||||
err = set_irq_affinity(platform_get_irq(pdev, i), i);
|
||||
if (err)
|
||||
break;
|
||||
}
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
int
|
||||
init_pmu(enum arm_pmu_type device)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
switch (device) {
|
||||
case ARM_PMU_DEVICE_CPU:
|
||||
err = init_cpu_pmu();
|
||||
break;
|
||||
default:
|
||||
pr_warning("attempt to initialise unknown device %d\n",
|
||||
device);
|
||||
err = -EINVAL;
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(init_pmu);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче