![Ingo Molnar](/assets/img/avatar_default.png)
Merge it in to pick up a fix that we are going to clean up in this branch. Signed-off-by: Ingo Molnar <mingo@kernel.org>
832 lines
20 KiB
C
832 lines
20 KiB
C
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.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 <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/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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#ifdef CONFIG_X86_32
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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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#else
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# include <asm/x86_init.h>
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#endif
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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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static const struct desc_ptr no_idt = {};
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static int reboot_mode;
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enum reboot_type reboot_type = BOOT_ACPI;
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int reboot_force;
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/*
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* This variable is used privately to keep track of whether or not
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* reboot_type is still set to its default value (i.e., reboot= hasn't
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* been set on the command line). This is needed so that we can
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* suppress DMI scanning for reboot quirks. Without it, it's
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* impossible to override a faulty reboot quirk without recompiling.
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*/
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static int reboot_default = 1;
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#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
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static int reboot_cpu = -1;
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#endif
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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=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
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* warm Don't set the cold reboot flag
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* cold Set the cold reboot flag
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* bios Reboot by jumping through the BIOS (only for X86_32)
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* smp Reboot by executing reset on BSP or other CPU (only for X86_32)
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* triple Force a triple fault (init)
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* kbd Use the keyboard controller. cold reset (default)
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* acpi Use the RESET_REG in the FADT
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* efi Use efi reset_system runtime service
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* pci Use the so-called "PCI reset register", CF9
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* force Avoid anything that could hang.
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*/
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static int __init reboot_setup(char *str)
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{
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for (;;) {
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/*
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* Having anything passed on the command line via
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* reboot= will cause us to disable DMI checking
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* below.
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*/
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reboot_default = 0;
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switch (*str) {
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case 'w':
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reboot_mode = 0x1234;
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break;
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case 'c':
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reboot_mode = 0;
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break;
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#ifdef CONFIG_X86_32
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#ifdef CONFIG_SMP
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case 's':
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if (isdigit(*(str+1))) {
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reboot_cpu = (int) (*(str+1) - '0');
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if (isdigit(*(str+2)))
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reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
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}
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/*
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* We will leave sorting out the final value
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* when we are ready to reboot, since we might not
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* have detected BSP APIC ID or smp_num_cpu
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*/
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break;
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#endif /* CONFIG_SMP */
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case 'b':
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#endif
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case 'a':
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case 'k':
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case 't':
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case 'e':
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case 'p':
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reboot_type = *str;
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break;
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case 'f':
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reboot_force = 1;
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break;
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}
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str = strchr(str, ',');
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if (str)
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str++;
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else
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break;
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}
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return 1;
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}
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__setup("reboot=", reboot_setup);
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#ifdef CONFIG_X86_32
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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=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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"BIOS", d->ident);
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}
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return 0;
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}
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void machine_real_restart(unsigned int type)
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{
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void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int))
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real_mode_header->machine_real_restart_asm;
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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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load_cr3(initial_page_table);
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/*
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* Write 0x1234 to absolute memory location 0x472. The BIOS reads
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* this on booting to tell it to "Bypass memory test (also warm
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* boot)". This seems like a fairly standard thing that gets set by
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* REBOOT.COM programs, and the previous reset routine did this
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* too. */
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*((unsigned short *)0x472) = reboot_mode;
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/* Jump to the identity-mapped low memory code */
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restart_lowmem(type);
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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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#endif /* CONFIG_X86_32 */
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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) {
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reboot_type = BOOT_CF9;
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pr_info("%s series board detected. Selecting %s-method for reboots.\n",
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"PCI", d->ident);
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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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"KBD", d->ident);
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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. Note that
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* REBOOT_BIOS is only available for 32bit
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*/
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static struct dmi_system_id __initdata reboot_dmi_table[] = {
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#ifdef CONFIG_X86_32
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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 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 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 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 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 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 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 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 HP laptops */
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.callback = set_bios_reboot,
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.ident = "HP Compaq Laptop",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
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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 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 Sony VGN-Z540N */
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.callback = set_bios_reboot,
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.ident = "Sony VGN-Z540N",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
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},
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},
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{ /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
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.callback = set_bios_reboot,
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.ident = "CompuLab SBC-FITPC2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
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DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
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},
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},
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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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#endif /* CONFIG_X86_32 */
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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 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 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 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 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 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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{ }
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};
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static int __init reboot_init(void)
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{
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/*
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* Only do the DMI check if reboot_type hasn't been overridden
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* on the command line
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*/
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if (reboot_default)
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dmi_check_system(reboot_dmi_table);
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return 0;
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}
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core_initcall(reboot_init);
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static inline void kb_wait(void)
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{
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int i;
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for (i = 0; i < 0x10000; i++) {
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if ((inb(0x64) & 0x02) == 0)
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break;
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udelay(2);
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}
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}
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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)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*
|
|
* If the machine is still alive at this stage, it gives up. We default to
|
|
* following the same pattern, except that if we're still alive after (4) we'll
|
|
* try to force a triple fault and then cycle between hitting the keyboard
|
|
* controller and doing that
|
|
*/
|
|
static void native_machine_emergency_restart(void)
|
|
{
|
|
int i;
|
|
int attempt = 0;
|
|
int orig_reboot_type = reboot_type;
|
|
|
|
if (reboot_emergency)
|
|
emergency_vmx_disable_all();
|
|
|
|
tboot_shutdown(TB_SHUTDOWN_REBOOT);
|
|
|
|
/* Tell the BIOS if we want cold or warm reboot */
|
|
*((unsigned short *)__va(0x472)) = reboot_mode;
|
|
|
|
for (;;) {
|
|
/* Could also try the reset bit in the Hammer NB */
|
|
switch (reboot_type) {
|
|
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_TRIPLE;
|
|
}
|
|
break;
|
|
|
|
case BOOT_TRIPLE:
|
|
load_idt(&no_idt);
|
|
__asm__ __volatile__("int3");
|
|
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
|
|
#ifdef CONFIG_X86_32
|
|
case BOOT_BIOS:
|
|
machine_real_restart(MRR_BIOS);
|
|
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
#endif
|
|
|
|
case BOOT_ACPI:
|
|
acpi_reboot();
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
|
|
case BOOT_EFI:
|
|
if (efi_enabled)
|
|
efi.reset_system(reboot_mode ?
|
|
EFI_RESET_WARM :
|
|
EFI_RESET_COLD,
|
|
EFI_SUCCESS, 0, NULL);
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
|
|
case BOOT_CF9:
|
|
port_cf9_safe = true;
|
|
/* Fall through */
|
|
|
|
case BOOT_CF9_COND:
|
|
if (port_cf9_safe) {
|
|
u8 cf9 = inb(0xcf9) & ~6;
|
|
outb(cf9|2, 0xcf9); /* Request hard reset */
|
|
udelay(50);
|
|
outb(cf9|6, 0xcf9); /* Actually do the reset */
|
|
udelay(50);
|
|
}
|
|
reboot_type = BOOT_KBD;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void native_machine_shutdown(void)
|
|
{
|
|
/* Stop the cpus and apics */
|
|
#ifdef CONFIG_SMP
|
|
|
|
/* The boot cpu is always logical cpu 0 */
|
|
int reboot_cpu_id = 0;
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* See if there has been given a command line override */
|
|
if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
|
|
cpu_online(reboot_cpu))
|
|
reboot_cpu_id = reboot_cpu;
|
|
#endif
|
|
|
|
/* Make certain the cpu I'm about to reboot on is online */
|
|
if (!cpu_online(reboot_cpu_id))
|
|
reboot_cpu_id = smp_processor_id();
|
|
|
|
/* Make certain I only run on the appropriate processor */
|
|
set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
|
|
|
|
/*
|
|
* O.K Now that I'm on the appropriate processor, 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_X86_IO_APIC
|
|
disable_IO_APIC();
|
|
#endif
|
|
|
|
#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 = {
|
|
.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
|
|
.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
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
machine_ops.crash_shutdown(regs);
|
|
}
|
|
#endif
|
|
|
|
|
|
#if defined(CONFIG_SMP)
|
|
|
|
/* This keeps a track of which one is crashing cpu. */
|
|
static int crashing_cpu;
|
|
static nmi_shootdown_cb shootdown_callback;
|
|
|
|
static atomic_t waiting_for_crash_ipi;
|
|
|
|
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;
|
|
}
|
|
|
|
static void smp_send_nmi_allbutself(void)
|
|
{
|
|
apic->send_IPI_allbutself(NMI_VECTOR);
|
|
}
|
|
|
|
/*
|
|
* 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();
|
|
|
|
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 */
|
|
}
|
|
#else /* !CONFIG_SMP */
|
|
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
|
|
{
|
|
/* No other CPUs to shoot down */
|
|
}
|
|
#endif
|