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ACPI / PM: Move processor suspend/resume to syscore_ops

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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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29
drivers/acpi/processor_idle.c
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@@ -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)