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https://github.com/torvalds/linux
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6660316cb7
machine_power_off on i386 and x86_64 now switch to the boot cpu out of paranoia and because the MP Specification indicates it is a good idea on reboot, so for those architectures it is a noop. I can't see anything in the acpi spec that requires you to be on the boot cpu to power off the system, so this should not be an issue for ia64. In addition ia64 has the altix a massive multi-node system where switching to the boot cpu sounds insane as we may hot removed the boot cpu. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* poweroff.c - ACPI handler for powering off the system.
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*
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* AKA S5, but it is independent of whether or not the kernel supports
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* any other sleep support in the system.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/pm.h>
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#include <linux/init.h>
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#include <acpi/acpi_bus.h>
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#include <linux/sched.h>
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#include <linux/sysdev.h>
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#include <asm/io.h>
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#include "sleep.h"
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int acpi_sleep_prepare(u32 acpi_state)
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{
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/* Flag to do not allow second time invocation for S5 state */
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static int shutdown_prepared = 0;
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#ifdef CONFIG_ACPI_SLEEP
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/* do we have a wakeup address for S2 and S3? */
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/* Here, we support only S4BIOS, those we set the wakeup address */
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/* S4OS is only supported for now via swsusp.. */
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if (acpi_state == ACPI_STATE_S3 || acpi_state == ACPI_STATE_S4) {
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if (!acpi_wakeup_address) {
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return -EFAULT;
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}
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acpi_set_firmware_waking_vector((acpi_physical_address)
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virt_to_phys((void *)
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acpi_wakeup_address));
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}
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ACPI_FLUSH_CPU_CACHE();
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acpi_enable_wakeup_device_prep(acpi_state);
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#endif
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if (acpi_state == ACPI_STATE_S5) {
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/* Check if we were already called */
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if (shutdown_prepared)
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return 0;
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acpi_wakeup_gpe_poweroff_prepare();
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shutdown_prepared = 1;
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}
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acpi_enter_sleep_state_prep(acpi_state);
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return 0;
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}
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void acpi_power_off(void)
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{
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printk("%s called\n", __FUNCTION__);
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acpi_sleep_prepare(ACPI_STATE_S5);
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local_irq_disable();
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/* Some SMP machines only can poweroff in boot CPU */
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acpi_enter_sleep_state(ACPI_STATE_S5);
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}
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#ifdef CONFIG_PM
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static int acpi_shutdown(struct sys_device *x)
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{
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return acpi_sleep_prepare(ACPI_STATE_S5);
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}
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static struct sysdev_class acpi_sysclass = {
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set_kset_name("acpi"),
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.shutdown = acpi_shutdown
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};
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static struct sys_device device_acpi = {
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.id = 0,
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.cls = &acpi_sysclass,
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};
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#endif
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static int acpi_poweroff_init(void)
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{
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if (!acpi_disabled) {
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u8 type_a, type_b;
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acpi_status status;
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status =
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acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
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if (ACPI_SUCCESS(status)) {
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pm_power_off = acpi_power_off;
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#ifdef CONFIG_PM
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{
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int error;
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error = sysdev_class_register(&acpi_sysclass);
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if (!error)
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error = sysdev_register(&device_acpi);
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return error;
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}
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#endif
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}
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}
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return 0;
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}
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late_initcall(acpi_poweroff_init);
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