Release 4.14 arch/x86/kernel/reboot.c

// SPDX-License-Identifier: GPL-2.0

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/export.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/efi.h>
#include <linux/dmi.h>
#include <linux/sched.h>
#include <linux/tboot.h>
#include <linux/delay.h>
#include <linux/frame.h>
#include <acpi/reboot.h>
#include <asm/io.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/desc.h>
#include <asm/hpet.h>
#include <asm/pgtable.h>
#include <asm/proto.h>
#include <asm/reboot_fixups.h>
#include <asm/reboot.h>
#include <asm/pci_x86.h>
#include <asm/virtext.h>
#include <asm/cpu.h>
#include <asm/nmi.h>
#include <asm/smp.h>

#include <linux/ctype.h>
#include <linux/mc146818rtc.h>
#include <asm/realmode.h>
#include <asm/x86_init.h>
#include <asm/efi.h>

/*
 * Power off function, if any
 */

void (*pm_power_off)(void);

EXPORT_SYMBOL(pm_power_off);

/*
 * This is set if we need to go through the 'emergency' path.
 * When machine_emergency_restart() is called, we may be on
 * an inconsistent state and won't be able to do a clean cleanup
 */

static int reboot_emergency;

/* This is set by the PCI code if either type 1 or type 2 PCI is detected */

bool port_cf9_safe = false;

/*
 * Reboot options and system auto-detection code provided by
 * Dell Inc. so their systems "just work". :-)
 */

/*
 * Some machines require the "reboot=a" commandline options
 */


static int __init set_acpi_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_ACPI) {
		reboot_type = BOOT_ACPI;
		pr_info("%s series board detected. Selecting %s-method for reboots.\n",
			d->ident, "ACPI");
	}
	return 0;
}

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/*
 * Some machines require the "reboot=b" or "reboot=k"  commandline options,
 * this quirk makes that automatic.
 */


static int __init set_bios_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_BIOS) {
		reboot_type = BOOT_BIOS;
		pr_info("%s series board detected. Selecting %s-method for reboots.\n",
			d->ident, "BIOS");
	}
	return 0;
}

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void __noreturn machine_real_restart(unsigned int type)
{
	local_irq_disable();

	/*
         * Write zero to CMOS register number 0x0f, which the BIOS POST
         * routine will recognize as telling it to do a proper reboot.  (Well
         * that's what this book in front of me says -- it may only apply to
         * the Phoenix BIOS though, it's not clear).  At the same time,
         * disable NMIs by setting the top bit in the CMOS address register,
         * as we're about to do peculiar things to the CPU.  I'm not sure if
         * `outb_p' is needed instead of just `outb'.  Use it to be on the
         * safe side.  (Yes, CMOS_WRITE does outb_p's. -  Paul G.)
         */
	spin_lock(&rtc_lock);
	CMOS_WRITE(0x00, 0x8f);
	spin_unlock(&rtc_lock);

	/*
         * Switch back to the initial page table.
         */
#ifdef CONFIG_X86_32
	load_cr3(initial_page_table);
#else
	write_cr3(real_mode_header->trampoline_pgd);

	/* Exiting long mode will fail if CR4.PCIDE is set. */
	if (static_cpu_has(X86_FEATURE_PCID))
		cr4_clear_bits(X86_CR4_PCIDE);
#endif

	/* Jump to the identity-mapped low memory code */
#ifdef CONFIG_X86_32
	asm volatile("jmpl *%0" : :
                     "rm" (real_mode_header->machine_real_restart_asm),
                     "a" (type));
#else
	asm volatile("ljmpl *%0" : :
                     "m" (real_mode_header->machine_real_restart_asm),
                     "D" (type));
#endif
	unreachable();
}
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#ifdef CONFIG_APM_MODULE

EXPORT_SYMBOL(machine_real_restart);
#endif

STACK_FRAME_NON_STANDARD(machine_real_restart);

/*
 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
 */


static int __init set_pci_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_CF9_FORCE) {
		reboot_type = BOOT_CF9_FORCE;
		pr_info("%s series board detected. Selecting %s-method for reboots.\n",
			d->ident, "PCI");
	}
	return 0;
}

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static int __init set_kbd_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_KBD) {
		reboot_type = BOOT_KBD;
		pr_info("%s series board detected. Selecting %s-method for reboot.\n",
			d->ident, "KBD");
	}
	return 0;
}

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/*
 * This is a single dmi_table handling all reboot quirks.
 */

static const struct dmi_system_id reboot_dmi_table[] __initconst = {

	/* Acer */
	{	/* Handle reboot issue on Acer Aspire one */
		.callback = set_kbd_reboot,
		.ident = "Acer Aspire One A110",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
                },
        },

	/* Apple */
	{	/* Handle problems with rebooting on Apple MacBook5 */
		.callback = set_pci_reboot,
		.ident = "Apple MacBook5",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
                },
        },
	{	/* Handle problems with rebooting on Apple MacBookPro5 */
		.callback = set_pci_reboot,
		.ident = "Apple MacBookPro5",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
                },
        },
	{	/* Handle problems with rebooting on Apple Macmini3,1 */
		.callback = set_pci_reboot,
		.ident = "Apple Macmini3,1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
                },
        },
	{	/* Handle problems with rebooting on the iMac9,1. */
		.callback = set_pci_reboot,
		.ident = "Apple iMac9,1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
                },
        },
	{	/* Handle problems with rebooting on the iMac10,1. */
		.callback = set_pci_reboot,
		.ident = "Apple iMac10,1",
		.matches = {
		    DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		    DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
                },
        },

	/* ASRock */
	{	/* Handle problems with rebooting on ASRock Q1900DC-ITX */
		.callback = set_pci_reboot,
		.ident = "ASRock Q1900DC-ITX",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
			DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
                },
        },

	/* ASUS */
	{	/* Handle problems with rebooting on ASUS P4S800 */
		.callback = set_bios_reboot,
		.ident = "ASUS P4S800",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
			DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
                },
        },
	{	/* Handle problems with rebooting on ASUS EeeBook X205TA */
		.callback = set_acpi_reboot,
		.ident = "ASUS EeeBook X205TA",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
                },
        },
	{	/* Handle problems with rebooting on ASUS EeeBook X205TAW */
		.callback = set_acpi_reboot,
		.ident = "ASUS EeeBook X205TAW",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
                },
        },

	/* Certec */
	{       /* Handle problems with rebooting on Certec BPC600 */
		.callback = set_pci_reboot,
		.ident = "Certec BPC600",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
			DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
                },
        },

	/* Dell */
	{	/* Handle problems with rebooting on Dell DXP061 */
		.callback = set_bios_reboot,
		.ident = "Dell DXP061",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
                },
        },
	{	/* Handle problems with rebooting on Dell E520's */
		.callback = set_bios_reboot,
		.ident = "Dell E520",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
                },
        },
	{	/* Handle problems with rebooting on the Latitude E5410. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E5410",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
                },
        },
	{	/* Handle problems with rebooting on the Latitude E5420. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E5420",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
                },
        },
	{	/* Handle problems with rebooting on the Latitude E6320. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E6320",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
                },
        },
	{	/* Handle problems with rebooting on the Latitude E6420. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E6420",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
                },
        },
	{	/* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 330",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
			DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
                },
        },
	{	/* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 360",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
			DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
                },
        },
	{	/* Handle problems with rebooting on Dell Optiplex 745's SFF */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 745",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
                },
        },
	{	/* Handle problems with rebooting on Dell Optiplex 745's DFF */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 745",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
			DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
                },
        },
	{	/* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 745",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
			DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
                },
        },
	{	/* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 760",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
			DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
                },
        },
	{	/* Handle problems with rebooting on the OptiPlex 990. */
		.callback = set_pci_reboot,
		.ident = "Dell OptiPlex 990",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
                },
        },
	{	/* Handle problems with rebooting on Dell 300's */
		.callback = set_bios_reboot,
		.ident = "Dell PowerEdge 300",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
                },
        },
	{	/* Handle problems with rebooting on Dell 1300's */
		.callback = set_bios_reboot,
		.ident = "Dell PowerEdge 1300",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
                },
        },
	{	/* Handle problems with rebooting on Dell 2400's */
		.callback = set_bios_reboot,
		.ident = "Dell PowerEdge 2400",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
                },
        },
	{	/* Handle problems with rebooting on the Dell PowerEdge C6100. */
		.callback = set_pci_reboot,
		.ident = "Dell PowerEdge C6100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
                },
        },
	{	/* Handle problems with rebooting on the Precision M6600. */
		.callback = set_pci_reboot,
		.ident = "Dell Precision M6600",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
                },
        },
	{	/* Handle problems with rebooting on Dell T5400's */
		.callback = set_bios_reboot,
		.ident = "Dell Precision T5400",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
                },
        },
	{	/* Handle problems with rebooting on Dell T7400's */
		.callback = set_bios_reboot,
		.ident = "Dell Precision T7400",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
                },
        },
	{	/* Handle problems with rebooting on Dell XPS710 */
		.callback = set_bios_reboot,
		.ident = "Dell XPS710",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
                },
        },
	{	/* Handle problems with rebooting on Dell Optiplex 7450 AIO */
		.callback = set_acpi_reboot,
		.ident = "Dell OptiPlex 7450 AIO",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
                },
        },

	/* Hewlett-Packard */
	{	/* Handle problems with rebooting on HP laptops */
		.callback = set_bios_reboot,
		.ident = "HP Compaq Laptop",
		.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;
}
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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);
	}
}

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static void vmxoff_nmi(int cpu, struct pt_regs *regs)
{
	cpu_emergency_vmxoff();
}

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/* 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);

	}
}


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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;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miguel Botón
66
22.15%
1
4.76%
H. Peter Anvin
54
18.12%
1
4.76%
Ingo Molnar
47
15.77%
2
9.52%
Matthew Garrett
37
12.42%
1
4.76%
Matt Fleming
20
6.71%
2
9.52%
Robin Holt
15
5.03%
1
4.76%
Li Fei
14
4.70%
1
4.76%
James Bottomley
8
2.68%
1
4.76%
Eduardo Pereira Habkost
7
2.35%
1
4.76%
Eric W. Biedermann
7
2.35%
1
4.76%
Andrew Morton
7
2.35%
2
9.52%
Joseph Cihula
5
1.68%
1
4.76%
Michael D Labriola
3
1.01%
1
4.76%
Thomas Gleixner
2
0.67%
1
4.76%
Zachary Amsden
2
0.67%
1
4.76%
Jody Belka
2
0.67%
1
4.76%
Aubrey Li
1
0.34%
1
4.76%
Mika Kukkonen
1
0.34%
1
4.76%
Total
298
100.00%
21
100.00%



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.
         */
	disable_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();

#ifdef CONFIG_HPET_TIMER
	hpet_disable();
#endif

#ifdef CONFIG_X86_64
	x86_platform.iommu_shutdown();
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miguel Botón
31
62.00%
1
11.11%
Fenghua Yu
9
18.00%
2
22.22%
Feng Tang
3
6.00%
1
11.11%
FUJITA Tomonori
3
6.00%
1
11.11%
Jody Belka
1
2.00%
1
11.11%
Alok N Kataria
1
2.00%
1
11.11%
Robin Holt
1
2.00%
1
11.11%
James Bottomley
1
2.00%
1
11.11%
Total
50
100.00%
9
100.00%



static void __machine_emergency_restart(int emergency)
{
	reboot_emergency = emergency;
	machine_ops.emergency_restart();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduardo Pereira Habkost
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%



static void native_machine_restart(char *__unused)
{
	pr_notice("machine restart\n");

	if (!reboot_force)
		machine_shutdown();
	__machine_emergency_restart(0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
12
42.86%
1
20.00%
Miguel Botón
9
32.14%
1
20.00%
Eduardo Pereira Habkost
4
14.29%
1
20.00%
Jody Belka
2
7.14%
1
20.00%
Joe Perches
1
3.57%
1
20.00%
Total
28
100.00%
5
100.00%



static void native_machine_halt(void)
{
	/* Stop other cpus and apics */
	machine_shutdown();

	tboot_shutdown(TB_SHUTDOWN_HALT);

	stop_this_cpu(NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ivan Vecera
10
45.45%
1
20.00%
Joseph Cihula
5
22.73%
1
20.00%
James Bottomley
4
18.18%
1
20.00%
Jody Belka
2
9.09%
1
20.00%
Michael D Labriola
1
4.55%
1
20.00%
Total
22
100.00%
5
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
James Bottomley
13
41.94%
1
16.67%
Joseph Cihula
5
16.13%
1
16.67%
Eric W. Biedermann
5
16.13%
1
16.67%
Miguel Botón
5
16.13%
1
16.67%
Jody Belka
2
6.45%
1
16.67%
Michael D Labriola
1
3.23%
1
16.67%
Total
31
100.00%
6
100.00%


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();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jody Belka
12
100.00%
1
100.00%
Total
12
100.00%
1
100.00%



void machine_shutdown(void)
{
	machine_ops.shutdown();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jody Belka
12
100.00%
1
100.00%
Total
12
100.00%
1
100.00%



void machine_emergency_restart(void)
{
	__machine_emergency_restart(1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jody Belka
8
66.67%
1
50.00%
Eduardo Pereira Habkost
4
33.33%
1
50.00%
Total
12
100.00%
2
100.00%



void machine_restart(char *cmd)
{
	machine_ops.restart(cmd);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jody Belka
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%



void machine_halt(void)
{
	machine_ops.halt();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jody Belka
12
100.00%
1
100.00%
Total
12
100.00%
1
100.00%

#ifdef CONFIG_KEXEC_CORE


void machine_crash_shutdown(struct pt_regs *regs)
{
	machine_ops.crash_shutdown(regs);
}
Contributors
Person
Tokens
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Commits
CommitProp
Glauber de Oliveira Costa
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%

#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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduardo Pereira Habkost
56
87.50%
1
33.33%
Don Zickus
7
10.94%
1
33.33%
Michael D Labriola
1
1.56%
1
33.33%
Total
64
100.00%
3
100.00%



static void smp_send_nmi_allbutself(void)
{
	apic->send_IPI_allbutself(NMI_VECTOR);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduardo Pereira Habkost
12
80.00%
1
33.33%
Ingo Molnar
3
20.00%
2
66.67%
Total
15
100.00%
3
100.00%

/*
 * 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();

	smp_send_nmi_allbutself();

	/* 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 */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduardo Pereira Habkost
78
80.41%
2
40.00%
Don Zickus
8
8.25%
1
20.00%
Hidehiro Kawai
8
8.25%
1
20.00%
Michael D Labriola
3
3.09%
1
20.00%
Total
97
100.00%
5
100.00%

/*
 * 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);
}

Contributors
Person
Tokens
Prop
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CommitProp
Hidehiro Kawai
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%

/* 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();
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hidehiro Kawai
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%

#else /* !CONFIG_SMP */


void nmi_shootdown_cpus(nmi_shootdown_cb callback)
{
	/* No other CPUs to shoot down */
}

Contributors
Person
Tokens
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CommitProp
Eduardo Pereira Habkost
9
100.00%
1
100.00%
Total
9
100.00%
1
100.00%



void run_crash_ipi_callback(struct pt_regs *regs)
{
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Hidehiro Kawai
9
100.00%
1
100.00%
Total
9
100.00%
1
100.00%

#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduardo Pereira Habkost
255
9.92%
4
3.57%
Miguel Botón
153
5.95%
1
0.89%
Dave Jones
145
5.64%
1
0.89%
Andrey Panin
119
4.63%
1
0.89%
H. Peter Anvin
119
4.63%
3
2.68%
Michael D Labriola
108
4.20%
3
2.68%
Ingo Molnar
95
3.70%
6
5.36%
Leann Ogasawara
75
2.92%
3
2.68%
Jody Belka
74
2.88%
1
0.89%
Alex Hung
72
2.80%
1
0.89%
Hidehiro Kawai
69
2.68%
2
1.79%
Matjaz Hegedic
64
2.49%
3
2.68%
Peter Chubb
61
2.37%
2
1.79%
James Bottomley
58
2.26%
1
0.89%
Masoud Sharbiani
54
2.10%
1
0.89%
Rui Zhang
53
2.06%
2
1.79%
Paul Mackerras
52
2.02%
1
0.89%
Matt Fleming
44
1.71%
3
2.68%
Alan Cox
40
1.56%
3
2.68%
Matthew Garrett
37
1.44%
1
0.89%
Christian Gmeiner
33
1.28%
1
0.89%
Stefan Lippers-Hollmann
33
1.28%
1
0.89%
Jean Delvare
32
1.25%
2
1.79%
Mario Kleiner
32
1.25%
1
0.89%
Glauber de Oliveira Costa
31
1.21%
1
0.89%
Jeremy Fitzhardinge
31
1.21%
2
1.79%
Daniel J Blueman
29
1.13%
1
0.89%
Thomas Backlund
29
1.13%
1
0.89%
Steve Conklin
29
1.13%
1
0.89%
Ville Syrjälä
28
1.09%
1
0.89%
Eric W. Biedermann
28
1.09%
3
2.68%
Thierry Vignaud
28
1.09%
1
0.89%
Ozan Çağlayan
28
1.09%
1
0.89%
Rafael J. Wysocki
28
1.09%
1
0.89%
Gottfried Haider
27
1.05%
1
0.89%
James Jarvis
27
1.05%
1
0.89%
Justin P. Mattock
27
1.05%
1
0.89%
Coleman Kane
27
1.05%
1
0.89%
Maxime Ripard
27
1.05%
1
0.89%
Tim Gardner
27
1.05%
1
0.89%
Heinz-Ado Arnolds
27
1.05%
1
0.89%
Don Zickus
20
0.78%
2
1.79%
Joe Perches
17
0.66%
1
0.89%
Robin Holt
16
0.62%
2
1.79%
Joseph Cihula
15
0.58%
1
0.89%
Li Fei
14
0.54%
1
0.89%
Andrew Lutomirski
13
0.51%
1
0.89%
Xunlei Pang
10
0.39%
1
0.89%
Ivan Vecera
10
0.39%
1
0.89%
Fenghua Yu
9
0.35%
2
1.79%
Andrew Morton
9
0.35%
2
1.79%
Alexey Dobriyan
8
0.31%
2
1.79%
Josh Poimboeuf
8
0.31%
1
0.89%
Lan Tianyu
6
0.23%
1
0.89%
Linus Torvalds
6
0.23%
2
1.79%
Jaswinder Singh Rajput
6
0.23%
2
1.79%
Stefan Assmann
5
0.19%
1
0.89%
FUJITA Tomonori
4
0.16%
1
0.89%
Zachary Amsden
4
0.16%
1
0.89%
Dmitri Vorobiev
3
0.12%
1
0.89%
Jarkko Sakkinen
3
0.12%
1
0.89%
Feng Tang
3
0.12%
1
0.89%
Shane Wang
3
0.12%
1
0.89%
Jiang Liu
3
0.12%
1
0.89%
Tobias Klauser
2
0.08%
1
0.89%
Mikael Pettersson
2
0.08%
1
0.89%
Adrian Bunk
2
0.08%
1
0.89%
Dave Young
2
0.08%
1
0.89%
Thomas Gleixner
2
0.08%
1
0.89%
Christoph Hellwig
2
0.08%
1
0.89%
Aubrey Li
1
0.04%
1
0.89%
Greg Kroah-Hartman
1
0.04%
1
0.89%
Jeff Garzik
1
0.04%
1
0.89%
Mika Kukkonen
1
0.04%
1
0.89%
Alok N Kataria
1
0.04%
1
0.89%
Kushal Koolwal
1
0.04%
1
0.89%
Kees Cook
1
0.04%
1
0.89%
Paul Gortmaker
1
0.04%
1
0.89%
Total
2570
100.00%
112
100.00%
Directory: arch/x86/kernel

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