S3:
初始化：
acpi_init
acpi_bus_init
acpi_sleep_init
acpi_sleep_suspend_setup
suspend_set_ops(old_suspend_ordering ?
&acpi_suspend_ops_old : &acpi_suspend_ops);
state_store
pm_suspend
enter_state
suspend_devices_and_enter
suspend_enter
error = suspend_ops->enter(state);//suspend_ops为acpi_suspend_ops_old or acpi_suspend_ops
static const struct platform_suspend_ops acpi_suspend_ops = {
.valid = acpi_suspend_state_valid,
.begin = acpi_suspend_begin,
.prepare_late = acpi_pm_prepare,
.enter = acpi_suspend_enter,
.wake = acpi_pm_finish,
.end = acpi_pm_end,
};
static const struct platform_suspend_ops acpi_suspend_ops_old = {
.valid = acpi_suspend_state_valid,
.begin = acpi_suspend_begin_old,
.prepare_late = acpi_pm_pre_suspend,
.enter = acpi_suspend_enter,
.wake = acpi_pm_finish,
.end = acpi_pm_end,
.recover = acpi_pm_finish,
};
S5是poweroff
hibernate (kernel/power/hibernate.c)
|- hibernation_snapshot| |- create_images
| |- disable_nonboot_cpus (kernel/cpu.c)
| | |- _cpu_down
| | | |- take_cpu_down
| | | | |- __cpu_disable (arch/x86/include/asm/smp.h) // Ensure this CPU doesn't handle any more interrupts
| | | | |- native_cpu_disable (arch/x86/kernel/Smpboot.c)
| | | |- __cpu_die (arch/x86/include/asm/smp.h) // This actually kills the CPU
| | | |- native_cpu_die (arch/x86/kernel/Smpboot.c)
| | |
| | |- cpumask_set_cpu (include/linux/cpumask.h)
| |
| |- in_suspend = 1;
| |
| |- save_processor_state (arch/x86/power/cpu.c)
| | |- __save_processor_state
| |
| |- swsusp_arch_suspend (arch/x86/power/hibernate_asm_32.S)
| | |- swsusp_save (kernel/power/snapshot.c)
| |
| |- restore_processor_state (arch/x86/power/cpu.c)
| |
| |- enable_nonboot_cpus (kernel/cpu.c)
|
|- if (in_suspend)
{
swsusp_write;
power_down;
in_suspend = 0;
}
software_resume (kernel/power/hibernate.c)
|- hibernation_restore // If successful, control returns after hibernation_snapshot->create_images->swsusp_arch_suspend
|- resume_target_kernel
|- disable_nonboot_cpus (kernel/cpu.c)
|- swsusp_arch_resume (arch/x86/power/Hibernate_32.c)
| |- restore_image (arch/x86/power/hibernate_asm_32.S)
|- // The code below is only ever reached in case of a failure.