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ARM: 6074/1: oprofile: convert from sysdev to platform device

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This is a reworking of an original patch posted by Aaro Koskinen:

oprofile does not work with PM, because sysdev_suspend() is done with
interrupts disabled and oprofile needs a mutex. Implementing oprofile
as a platform device solves this problem.

Cc: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2010-04-30 11:38:39 +01:00 committed by Russell King
parent fe166148f6
commit d1e86d64bc
1 changed files with 29 additions and 15 deletions
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44
arch/arm/oprofile/common.c
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@ -10,13 +10,14 @@
*/
#include <linux/cpumask.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/oprofile.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sysdev.h>
#include <asm/stacktrace.h>
#include <linux/uaccess.h>
@ -227,7 +228,7 @@ static void op_arm_stop(void)
}
#ifdef CONFIG_PM
static int op_arm_suspend(struct sys_device *dev, pm_message_t state)
static int op_arm_suspend(struct platform_device *dev, pm_message_t state)
{
mutex_lock(&op_arm_mutex);
if (op_arm_enabled)
@ -236,7 +237,7 @@ static int op_arm_suspend(struct sys_device *dev, pm_message_t state)
return 0;
}
static int op_arm_resume(struct sys_device *dev)
static int op_arm_resume(struct platform_device *dev)
{
mutex_lock(&op_arm_mutex);
if (op_arm_enabled && op_perf_start())
@ -245,34 +246,42 @@ static int op_arm_resume(struct sys_device *dev)
return 0;
}
static struct sysdev_class oprofile_sysclass = {
.name = "oprofile",
static struct platform_driver oprofile_driver = {
.driver = {
.name = "arm-oprofile",
},
.resume = op_arm_resume,
.suspend = op_arm_suspend,
};
static struct sys_device device_oprofile = {
.id = 0,
.cls = &oprofile_sysclass,
};
static struct platform_device *oprofile_pdev;
static int __init init_driverfs(void)
{
int ret;
if (!(ret = sysdev_class_register(&oprofile_sysclass)))
ret = sysdev_register(&device_oprofile);
ret = platform_driver_register(&oprofile_driver);
if (ret)
goto out;
oprofile_pdev = platform_device_register_simple(
oprofile_driver.driver.name, 0, NULL, 0);
if (IS_ERR(oprofile_pdev)) {
ret = PTR_ERR(oprofile_pdev);
platform_driver_unregister(&oprofile_driver);
}
out:
return ret;
}
static void exit_driverfs(void)
{
sysdev_unregister(&device_oprofile);
sysdev_class_unregister(&oprofile_sysclass);
platform_device_unregister(oprofile_pdev);
platform_driver_unregister(&oprofile_driver);
}
#else
#define init_driverfs() do { } while (0)
static int __init init_driverfs(void) { return 0; }
#define exit_driverfs() do { } while (0)
#endif /* CONFIG_PM */
@ -353,6 +362,12 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
return -ENOMEM;
}
ret = init_driverfs();
if (ret) {
kfree(counter_config);
return ret;
}
for_each_possible_cpu(cpu) {
perf_events[cpu] = kcalloc(perf_num_counters,
sizeof(struct perf_event *), GFP_KERNEL);
@ -365,7 +380,6 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
}
}
init_driverfs();
ops->backtrace = arm_backtrace;
ops->create_files = op_arm_create_files;
ops->setup = op_arm_setup;