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ACPI / PM: Move processor suspend/resume to syscore_ops 

The system suspend routine of the ACPI processor driver saves
the BUS_MASTER_RLD register and its resume routine restores it.
However, there can be only one such register in the system and it
really should be saved after non-boot CPUs have been offlined and
restored before they are put back online during resume.

For this reason, move the saving and restoration of BUS_MASTER_RLD
to syscore suspend and syscore resume, respectively, and drop the no
longer necessary suspend/resume callbacks from the ACPI processor
driver.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-05-02 21:54:37 +02:00
parent f722406faa
commit 0a3b15ac3c
3 changed files with 31 additions and 16 deletions
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8
drivers/acpi/processor_driver.c
View File

@ -95,9 +95,6 @@ static const struct acpi_device_id processor_device_ids[] = {
};
MODULE_DEVICE_TABLE(acpi, processor_device_ids);
static SIMPLE_DEV_PM_OPS(acpi_processor_pm,
acpi_processor_suspend, acpi_processor_resume);
static struct acpi_driver acpi_processor_driver = {
.name = "processor",
.class = ACPI_PROCESSOR_CLASS,
@ -107,7 +104,6 @@ static struct acpi_driver acpi_processor_driver = {
.remove = acpi_processor_remove,
.notify = acpi_processor_notify,
},
.drv.pm = &acpi_processor_pm,
};
#define INSTALL_NOTIFY_HANDLER 1
@ -934,6 +930,8 @@ static int __init acpi_processor_init(void)
if (result < 0)
return result;
acpi_processor_syscore_init();
acpi_processor_install_hotplug_notify();
acpi_thermal_cpufreq_init();
@ -956,6 +954,8 @@ static void __exit acpi_processor_exit(void)
acpi_processor_uninstall_hotplug_notify();
acpi_processor_syscore_exit();
acpi_bus_unregister_driver(&acpi_processor_driver);
return;

29
drivers/acpi/processor_idle.c
View File

@ -34,6 +34,7 @@
#include <linux/sched.h> /* need_resched() */
#include <linux/clockchips.h>
#include <linux/cpuidle.h>
#include <linux/syscore_ops.h>
/*
* Include the apic definitions for x86 to have the APIC timer related defines
@ -210,33 +211,41 @@ static void lapic_timer_state_broadcast(struct acpi_processor *pr,
#endif
#ifdef CONFIG_PM_SLEEP
static u32 saved_bm_rld;
static void acpi_idle_bm_rld_save(void)
int acpi_processor_suspend(void)
{
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
return 0;
}
static void acpi_idle_bm_rld_restore(void)
void acpi_processor_resume(void)
{
u32 resumed_bm_rld;
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
if (resumed_bm_rld == saved_bm_rld)
return;
if (resumed_bm_rld != saved_bm_rld)
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
}
int acpi_processor_suspend(struct device *dev)
static struct syscore_ops acpi_processor_syscore_ops = {
.suspend = acpi_processor_suspend,
.resume = acpi_processor_resume,
};
void acpi_processor_syscore_init(void)
{
acpi_idle_bm_rld_save();
return 0;
register_syscore_ops(&acpi_processor_syscore_ops);
}
int acpi_processor_resume(struct device *dev)
void acpi_processor_syscore_exit(void)
{
acpi_idle_bm_rld_restore();
return 0;
unregister_syscore_ops(&acpi_processor_syscore_ops);
}
#endif /* CONFIG_PM_SLEEP */
#if defined(CONFIG_X86)
static void tsc_check_state(int state)

10
include/acpi/processor.h
View File

@ -329,10 +329,16 @@ int acpi_processor_power_init(struct acpi_processor *pr);
int acpi_processor_power_exit(struct acpi_processor *pr);
int acpi_processor_cst_has_changed(struct acpi_processor *pr);
int acpi_processor_hotplug(struct acpi_processor *pr);
int acpi_processor_suspend(struct device *dev);
int acpi_processor_resume(struct device *dev);
extern struct cpuidle_driver acpi_idle_driver;
#ifdef CONFIG_PM_SLEEP
void acpi_processor_syscore_init(void);
void acpi_processor_syscore_exit(void);
#else
static inline void acpi_processor_syscore_init(void) {}
static inline void acpi_processor_syscore_exit(void) {}
#endif
/* in processor_thermal.c */
int acpi_processor_get_limit_info(struct acpi_processor *pr);
extern const struct thermal_cooling_device_ops processor_cooling_ops;