904 lines
23 KiB
C
904 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/export.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/efi.h>
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#include <linux/dmi.h>
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#include <linux/sched.h>
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#include <linux/tboot.h>
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#include <linux/delay.h>
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#include <linux/frame.h>
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#include <acpi/reboot.h>
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#include <asm/io.h>
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#include <asm/apic.h>
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#include <asm/io_apic.h>
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#include <asm/desc.h>
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#include <asm/hpet.h>
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#include <asm/pgtable.h>
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#include <asm/proto.h>
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#include <asm/reboot_fixups.h>
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#include <asm/reboot.h>
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#include <asm/pci_x86.h>
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#include <asm/virtext.h>
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#include <asm/cpu.h>
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#include <asm/nmi.h>
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#include <asm/smp.h>
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#include <linux/ctype.h>
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#include <linux/mc146818rtc.h>
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#include <asm/realmode.h>
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#include <asm/x86_init.h>
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#include <asm/efi.h>
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/*
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* Power off function, if any
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*/
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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/*
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* This is set if we need to go through the 'emergency' path.
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* When machine_emergency_restart() is called, we may be on
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* an inconsistent state and won't be able to do a clean cleanup
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*/
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static int reboot_emergency;
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/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
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bool port_cf9_safe = false;
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/*
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* Reboot options and system auto-detection code provided by
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* Dell Inc. so their systems "just work". :-)
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*/
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/*
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* Some machines require the "reboot=a" commandline options
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*/
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static int __init set_acpi_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_ACPI) {
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reboot_type = BOOT_ACPI;
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pr_info("%s series board detected. Selecting %s-method for reboots.\n",
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d->ident, "ACPI");
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}
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return 0;
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}
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/*
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* Some machines require the "reboot=b" or "reboot=k" commandline options,
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* this quirk makes that automatic.
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*/
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static int __init set_bios_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_BIOS) {
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reboot_type = BOOT_BIOS;
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pr_info("%s series board detected. Selecting %s-method for reboots.\n",
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d->ident, "BIOS");
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}
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return 0;
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}
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/*
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* Some machines don't handle the default ACPI reboot method and
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* require the EFI reboot method:
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*/
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static int __init set_efi_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_EFI && !efi_runtime_disabled()) {
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reboot_type = BOOT_EFI;
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pr_info("%s series board detected. Selecting EFI-method for reboot.\n", d->ident);
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}
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return 0;
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}
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void __noreturn machine_real_restart(unsigned int type)
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{
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local_irq_disable();
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/*
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* Write zero to CMOS register number 0x0f, which the BIOS POST
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* routine will recognize as telling it to do a proper reboot. (Well
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* that's what this book in front of me says -- it may only apply to
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* the Phoenix BIOS though, it's not clear). At the same time,
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* disable NMIs by setting the top bit in the CMOS address register,
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* as we're about to do peculiar things to the CPU. I'm not sure if
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* `outb_p' is needed instead of just `outb'. Use it to be on the
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* safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
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*/
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spin_lock(&rtc_lock);
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CMOS_WRITE(0x00, 0x8f);
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spin_unlock(&rtc_lock);
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/*
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* Switch back to the initial page table.
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*/
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#ifdef CONFIG_X86_32
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load_cr3(initial_page_table);
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#else
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write_cr3(real_mode_header->trampoline_pgd);
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/* Exiting long mode will fail if CR4.PCIDE is set. */
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if (boot_cpu_has(X86_FEATURE_PCID))
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cr4_clear_bits(X86_CR4_PCIDE);
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#endif
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/* Jump to the identity-mapped low memory code */
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#ifdef CONFIG_X86_32
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asm volatile("jmpl *%0" : :
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"rm" (real_mode_header->machine_real_restart_asm),
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"a" (type));
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#else
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asm volatile("ljmpl *%0" : :
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"m" (real_mode_header->machine_real_restart_asm),
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"D" (type));
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#endif
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unreachable();
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}
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#ifdef CONFIG_APM_MODULE
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EXPORT_SYMBOL(machine_real_restart);
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#endif
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STACK_FRAME_NON_STANDARD(machine_real_restart);
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/*
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* Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
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*/
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static int __init set_pci_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_CF9_FORCE) {
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reboot_type = BOOT_CF9_FORCE;
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pr_info("%s series board detected. Selecting %s-method for reboots.\n",
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d->ident, "PCI");
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}
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return 0;
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}
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static int __init set_kbd_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_KBD) {
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reboot_type = BOOT_KBD;
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pr_info("%s series board detected. Selecting %s-method for reboot.\n",
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d->ident, "KBD");
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}
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return 0;
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}
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/*
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* This is a single dmi_table handling all reboot quirks.
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*/
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static const struct dmi_system_id reboot_dmi_table[] __initconst = {
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/* Acer */
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{ /* Handle reboot issue on Acer Aspire one */
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.callback = set_kbd_reboot,
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.ident = "Acer Aspire One A110",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
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DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
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},
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},
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{ /* Handle reboot issue on Acer TravelMate X514-51T */
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.callback = set_efi_reboot,
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.ident = "Acer TravelMate X514-51T",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
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DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"),
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},
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},
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/* Apple */
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{ /* Handle problems with rebooting on Apple MacBook5 */
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.callback = set_pci_reboot,
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.ident = "Apple MacBook5",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
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},
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},
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{ /* Handle problems with rebooting on Apple MacBookPro5 */
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.callback = set_pci_reboot,
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.ident = "Apple MacBookPro5",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
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},
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},
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{ /* Handle problems with rebooting on Apple Macmini3,1 */
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.callback = set_pci_reboot,
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.ident = "Apple Macmini3,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
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},
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},
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{ /* Handle problems with rebooting on the iMac9,1. */
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.callback = set_pci_reboot,
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.ident = "Apple iMac9,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
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},
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},
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{ /* Handle problems with rebooting on the iMac10,1. */
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.callback = set_pci_reboot,
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.ident = "Apple iMac10,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
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},
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},
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/* ASRock */
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{ /* Handle problems with rebooting on ASRock Q1900DC-ITX */
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.callback = set_pci_reboot,
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.ident = "ASRock Q1900DC-ITX",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
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DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
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},
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},
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/* ASUS */
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{ /* Handle problems with rebooting on ASUS P4S800 */
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.callback = set_bios_reboot,
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.ident = "ASUS P4S800",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
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},
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},
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{ /* Handle problems with rebooting on ASUS EeeBook X205TA */
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.callback = set_acpi_reboot,
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.ident = "ASUS EeeBook X205TA",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
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DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
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},
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},
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{ /* Handle problems with rebooting on ASUS EeeBook X205TAW */
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.callback = set_acpi_reboot,
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.ident = "ASUS EeeBook X205TAW",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
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DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
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},
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},
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/* Certec */
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{ /* Handle problems with rebooting on Certec BPC600 */
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.callback = set_pci_reboot,
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.ident = "Certec BPC600",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
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DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
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},
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},
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/* Dell */
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{ /* Handle problems with rebooting on Dell DXP061 */
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.callback = set_bios_reboot,
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.ident = "Dell DXP061",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
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},
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},
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{ /* Handle problems with rebooting on Dell E520's */
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.callback = set_bios_reboot,
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.ident = "Dell E520",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
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},
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},
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{ /* Handle problems with rebooting on the Latitude E5410. */
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.callback = set_pci_reboot,
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.ident = "Dell Latitude E5410",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
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},
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},
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{ /* Handle problems with rebooting on the Latitude E5420. */
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.callback = set_pci_reboot,
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.ident = "Dell Latitude E5420",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
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},
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},
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{ /* Handle problems with rebooting on the Latitude E6320. */
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.callback = set_pci_reboot,
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.ident = "Dell Latitude E6320",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
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},
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},
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{ /* Handle problems with rebooting on the Latitude E6420. */
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.callback = set_pci_reboot,
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.ident = "Dell Latitude E6420",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 330",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
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DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 360",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
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DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 745's SFF */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 745",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 745's DFF */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 745",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
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DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 745",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
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DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
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},
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},
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{ /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 760",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
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DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
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},
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},
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{ /* Handle problems with rebooting on the OptiPlex 990. */
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.callback = set_pci_reboot,
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.ident = "Dell OptiPlex 990",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
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},
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},
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{ /* Handle problems with rebooting on Dell 300's */
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.callback = set_bios_reboot,
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.ident = "Dell PowerEdge 300",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
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},
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},
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{ /* Handle problems with rebooting on Dell 1300's */
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.callback = set_bios_reboot,
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.ident = "Dell PowerEdge 1300",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
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},
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},
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{ /* Handle problems with rebooting on Dell 2400's */
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.callback = set_bios_reboot,
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.ident = "Dell PowerEdge 2400",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
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},
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},
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{ /* Handle problems with rebooting on the Dell PowerEdge C6100. */
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.callback = set_pci_reboot,
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.ident = "Dell PowerEdge C6100",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
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},
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},
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{ /* Handle problems with rebooting on the Precision M6600. */
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.callback = set_pci_reboot,
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.ident = "Dell Precision M6600",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
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},
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},
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{ /* Handle problems with rebooting on Dell T5400's */
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.callback = set_bios_reboot,
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.ident = "Dell Precision T5400",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
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},
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},
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{ /* Handle problems with rebooting on Dell T7400's */
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.callback = set_bios_reboot,
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.ident = "Dell Precision T7400",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
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},
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},
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{ /* Handle problems with rebooting on Dell XPS710 */
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.callback = set_bios_reboot,
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.ident = "Dell XPS710",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 7450 AIO */
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.callback = set_acpi_reboot,
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.ident = "Dell OptiPlex 7450 AIO",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
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},
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},
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/* Hewlett-Packard */
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{ /* Handle problems with rebooting on HP laptops */
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.callback = set_bios_reboot,
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.ident = "HP Compaq Laptop",
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.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
|
|
},
|
|
},
|
|
|
|
/* Sony */
|
|
{ /* Handle problems with rebooting on Sony VGN-Z540N */
|
|
.callback = set_bios_reboot,
|
|
.ident = "Sony VGN-Z540N",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
|
|
},
|
|
},
|
|
|
|
{ }
|
|
};
|
|
|
|
static int __init reboot_init(void)
|
|
{
|
|
int rv;
|
|
|
|
/*
|
|
* Only do the DMI check if reboot_type hasn't been overridden
|
|
* on the command line
|
|
*/
|
|
if (!reboot_default)
|
|
return 0;
|
|
|
|
/*
|
|
* The DMI quirks table takes precedence. If no quirks entry
|
|
* matches and the ACPI Hardware Reduced bit is set and EFI
|
|
* runtime services are enabled, force EFI reboot.
|
|
*/
|
|
rv = dmi_check_system(reboot_dmi_table);
|
|
|
|
if (!rv && efi_reboot_required() && !efi_runtime_disabled())
|
|
reboot_type = BOOT_EFI;
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(reboot_init);
|
|
|
|
static inline void kb_wait(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 0x10000; i++) {
|
|
if ((inb(0x64) & 0x02) == 0)
|
|
break;
|
|
udelay(2);
|
|
}
|
|
}
|
|
|
|
static void vmxoff_nmi(int cpu, struct pt_regs *regs)
|
|
{
|
|
cpu_emergency_vmxoff();
|
|
}
|
|
|
|
/* Use NMIs as IPIs to tell all CPUs to disable virtualization */
|
|
static void emergency_vmx_disable_all(void)
|
|
{
|
|
/* Just make sure we won't change CPUs while doing this */
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* We need to disable VMX on all CPUs before rebooting, otherwise
|
|
* we risk hanging up the machine, because the CPU ignore INIT
|
|
* signals when VMX is enabled.
|
|
*
|
|
* We can't take any locks and we may be on an inconsistent
|
|
* state, so we use NMIs as IPIs to tell the other CPUs to disable
|
|
* VMX and halt.
|
|
*
|
|
* For safety, we will avoid running the nmi_shootdown_cpus()
|
|
* stuff unnecessarily, but we don't have a way to check
|
|
* if other CPUs have VMX enabled. So we will call it only if the
|
|
* CPU we are running on has VMX enabled.
|
|
*
|
|
* We will miss cases where VMX is not enabled on all CPUs. This
|
|
* shouldn't do much harm because KVM always enable VMX on all
|
|
* CPUs anyway. But we can miss it on the small window where KVM
|
|
* is still enabling VMX.
|
|
*/
|
|
if (cpu_has_vmx() && cpu_vmx_enabled()) {
|
|
/* Disable VMX on this CPU. */
|
|
cpu_vmxoff();
|
|
|
|
/* Halt and disable VMX on the other CPUs */
|
|
nmi_shootdown_cpus(vmxoff_nmi);
|
|
|
|
}
|
|
}
|
|
|
|
|
|
void __attribute__((weak)) mach_reboot_fixups(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* To the best of our knowledge Windows compatible x86 hardware expects
|
|
* the following on reboot:
|
|
*
|
|
* 1) If the FADT has the ACPI reboot register flag set, try it
|
|
* 2) If still alive, write to the keyboard controller
|
|
* 3) If still alive, write to the ACPI reboot register again
|
|
* 4) If still alive, write to the keyboard controller again
|
|
* 5) If still alive, call the EFI runtime service to reboot
|
|
* 6) If no EFI runtime service, call the BIOS to do a reboot
|
|
*
|
|
* We default to following the same pattern. We also have
|
|
* two other reboot methods: 'triple fault' and 'PCI', which
|
|
* can be triggered via the reboot= kernel boot option or
|
|
* via quirks.
|
|
*
|
|
* This means that this function can never return, it can misbehave
|
|
* by not rebooting properly and hanging.
|
|
*/
|
|
static void native_machine_emergency_restart(void)
|
|
{
|
|
int i;
|
|
int attempt = 0;
|
|
int orig_reboot_type = reboot_type;
|
|
unsigned short mode;
|
|
|
|
if (reboot_emergency)
|
|
emergency_vmx_disable_all();
|
|
|
|
tboot_shutdown(TB_SHUTDOWN_REBOOT);
|
|
|
|
/* Tell the BIOS if we want cold or warm reboot */
|
|
mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
|
|
*((unsigned short *)__va(0x472)) = mode;
|
|
|
|
/*
|
|
* If an EFI capsule has been registered with the firmware then
|
|
* override the reboot= parameter.
|
|
*/
|
|
if (efi_capsule_pending(NULL)) {
|
|
pr_info("EFI capsule is pending, forcing EFI reboot.\n");
|
|
reboot_type = BOOT_EFI;
|
|
}
|
|
|
|
for (;;) {
|
|
/* Could also try the reset bit in the Hammer NB */
|
|
switch (reboot_type) {
|
|
case BOOT_ACPI:
|
|
acpi_reboot();
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
|
|
case BOOT_KBD:
|
|
mach_reboot_fixups(); /* For board specific fixups */
|
|
|
|
for (i = 0; i < 10; i++) {
|
|
kb_wait();
|
|
udelay(50);
|
|
outb(0xfe, 0x64); /* Pulse reset low */
|
|
udelay(50);
|
|
}
|
|
if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
|
|
attempt = 1;
|
|
reboot_type = BOOT_ACPI;
|
|
} else {
|
|
reboot_type = BOOT_EFI;
|
|
}
|
|
break;
|
|
|
|
case BOOT_EFI:
|
|
efi_reboot(reboot_mode, NULL);
|
|
reboot_type = BOOT_BIOS;
|
|
break;
|
|
|
|
case BOOT_BIOS:
|
|
machine_real_restart(MRR_BIOS);
|
|
|
|
/* We're probably dead after this, but... */
|
|
reboot_type = BOOT_CF9_SAFE;
|
|
break;
|
|
|
|
case BOOT_CF9_FORCE:
|
|
port_cf9_safe = true;
|
|
/* Fall through */
|
|
|
|
case BOOT_CF9_SAFE:
|
|
if (port_cf9_safe) {
|
|
u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
|
|
u8 cf9 = inb(0xcf9) & ~reboot_code;
|
|
outb(cf9|2, 0xcf9); /* Request hard reset */
|
|
udelay(50);
|
|
/* Actually do the reset */
|
|
outb(cf9|reboot_code, 0xcf9);
|
|
udelay(50);
|
|
}
|
|
reboot_type = BOOT_TRIPLE;
|
|
break;
|
|
|
|
case BOOT_TRIPLE:
|
|
idt_invalidate(NULL);
|
|
__asm__ __volatile__("int3");
|
|
|
|
/* We're probably dead after this, but... */
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void native_machine_shutdown(void)
|
|
{
|
|
/* Stop the cpus and apics */
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
/*
|
|
* Disabling IO APIC before local APIC is a workaround for
|
|
* erratum AVR31 in "Intel Atom Processor C2000 Product Family
|
|
* Specification Update". In this situation, interrupts that target
|
|
* a Logical Processor whose Local APIC is either in the process of
|
|
* being hardware disabled or software disabled are neither delivered
|
|
* nor discarded. When this erratum occurs, the processor may hang.
|
|
*
|
|
* Even without the erratum, it still makes sense to quiet IO APIC
|
|
* before disabling Local APIC.
|
|
*/
|
|
clear_IO_APIC();
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Stop all of the others. Also disable the local irq to
|
|
* not receive the per-cpu timer interrupt which may trigger
|
|
* scheduler's load balance.
|
|
*/
|
|
local_irq_disable();
|
|
stop_other_cpus();
|
|
#endif
|
|
|
|
lapic_shutdown();
|
|
restore_boot_irq_mode();
|
|
|
|
#ifdef CONFIG_HPET_TIMER
|
|
hpet_disable();
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
x86_platform.iommu_shutdown();
|
|
#endif
|
|
}
|
|
|
|
static void __machine_emergency_restart(int emergency)
|
|
{
|
|
reboot_emergency = emergency;
|
|
machine_ops.emergency_restart();
|
|
}
|
|
|
|
static void native_machine_restart(char *__unused)
|
|
{
|
|
pr_notice("machine restart\n");
|
|
|
|
if (!reboot_force)
|
|
machine_shutdown();
|
|
__machine_emergency_restart(0);
|
|
}
|
|
|
|
static void native_machine_halt(void)
|
|
{
|
|
/* Stop other cpus and apics */
|
|
machine_shutdown();
|
|
|
|
tboot_shutdown(TB_SHUTDOWN_HALT);
|
|
|
|
stop_this_cpu(NULL);
|
|
}
|
|
|
|
static void native_machine_power_off(void)
|
|
{
|
|
if (pm_power_off) {
|
|
if (!reboot_force)
|
|
machine_shutdown();
|
|
pm_power_off();
|
|
}
|
|
/* A fallback in case there is no PM info available */
|
|
tboot_shutdown(TB_SHUTDOWN_HALT);
|
|
}
|
|
|
|
struct machine_ops machine_ops __ro_after_init = {
|
|
.power_off = native_machine_power_off,
|
|
.shutdown = native_machine_shutdown,
|
|
.emergency_restart = native_machine_emergency_restart,
|
|
.restart = native_machine_restart,
|
|
.halt = native_machine_halt,
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
.crash_shutdown = native_machine_crash_shutdown,
|
|
#endif
|
|
};
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
machine_ops.power_off();
|
|
}
|
|
|
|
void machine_shutdown(void)
|
|
{
|
|
machine_ops.shutdown();
|
|
}
|
|
|
|
void machine_emergency_restart(void)
|
|
{
|
|
__machine_emergency_restart(1);
|
|
}
|
|
|
|
void machine_restart(char *cmd)
|
|
{
|
|
machine_ops.restart(cmd);
|
|
}
|
|
|
|
void machine_halt(void)
|
|
{
|
|
machine_ops.halt();
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
machine_ops.crash_shutdown(regs);
|
|
}
|
|
#endif
|
|
|
|
|
|
/* This is the CPU performing the emergency shutdown work. */
|
|
int crashing_cpu = -1;
|
|
|
|
#if defined(CONFIG_SMP)
|
|
|
|
static nmi_shootdown_cb shootdown_callback;
|
|
|
|
static atomic_t waiting_for_crash_ipi;
|
|
static int crash_ipi_issued;
|
|
|
|
static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
|
|
{
|
|
int cpu;
|
|
|
|
cpu = raw_smp_processor_id();
|
|
|
|
/*
|
|
* Don't do anything if this handler is invoked on crashing cpu.
|
|
* Otherwise, system will completely hang. Crashing cpu can get
|
|
* an NMI if system was initially booted with nmi_watchdog parameter.
|
|
*/
|
|
if (cpu == crashing_cpu)
|
|
return NMI_HANDLED;
|
|
local_irq_disable();
|
|
|
|
shootdown_callback(cpu, regs);
|
|
|
|
atomic_dec(&waiting_for_crash_ipi);
|
|
/* Assume hlt works */
|
|
halt();
|
|
for (;;)
|
|
cpu_relax();
|
|
|
|
return NMI_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Halt all other CPUs, calling the specified function on each of them
|
|
*
|
|
* This function can be used to halt all other CPUs on crash
|
|
* or emergency reboot time. The function passed as parameter
|
|
* will be called inside a NMI handler on all CPUs.
|
|
*/
|
|
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
|
|
{
|
|
unsigned long msecs;
|
|
local_irq_disable();
|
|
|
|
/* Make a note of crashing cpu. Will be used in NMI callback. */
|
|
crashing_cpu = safe_smp_processor_id();
|
|
|
|
shootdown_callback = callback;
|
|
|
|
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
|
|
/* Would it be better to replace the trap vector here? */
|
|
if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
|
|
NMI_FLAG_FIRST, "crash"))
|
|
return; /* Return what? */
|
|
/*
|
|
* Ensure the new callback function is set before sending
|
|
* out the NMI
|
|
*/
|
|
wmb();
|
|
|
|
apic_send_IPI_allbutself(NMI_VECTOR);
|
|
|
|
/* Kick CPUs looping in NMI context. */
|
|
WRITE_ONCE(crash_ipi_issued, 1);
|
|
|
|
msecs = 1000; /* Wait at most a second for the other cpus to stop */
|
|
while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
|
|
mdelay(1);
|
|
msecs--;
|
|
}
|
|
|
|
/* Leave the nmi callback set */
|
|
}
|
|
|
|
/*
|
|
* Check if the crash dumping IPI got issued and if so, call its callback
|
|
* directly. This function is used when we have already been in NMI handler.
|
|
* It doesn't return.
|
|
*/
|
|
void run_crash_ipi_callback(struct pt_regs *regs)
|
|
{
|
|
if (crash_ipi_issued)
|
|
crash_nmi_callback(0, regs);
|
|
}
|
|
|
|
/* Override the weak function in kernel/panic.c */
|
|
void nmi_panic_self_stop(struct pt_regs *regs)
|
|
{
|
|
while (1) {
|
|
/* If no CPU is preparing crash dump, we simply loop here. */
|
|
run_crash_ipi_callback(regs);
|
|
cpu_relax();
|
|
}
|
|
}
|
|
|
|
#else /* !CONFIG_SMP */
|
|
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
|
|
{
|
|
/* No other CPUs to shoot down */
|
|
}
|
|
|
|
void run_crash_ipi_callback(struct pt_regs *regs)
|
|
{
|
|
}
|
|
#endif
|