#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Power off function, if any */ void (*pm_power_off)(void); EXPORT_SYMBOL(pm_power_off); static const struct desc_ptr no_idt = {}; static int reboot_mode; enum reboot_type reboot_type = BOOT_ACPI; int reboot_force; /* * This variable is used privately to keep track of whether or not * reboot_type is still set to its default value (i.e., reboot= hasn't * been set on the command line). This is needed so that we can * suppress DMI scanning for reboot quirks. Without it, it's * impossible to override a faulty reboot quirk without recompiling. */ static int reboot_default = 1; #ifdef CONFIG_SMP static int reboot_cpu = -1; #endif /* * 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=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci] * warm Don't set the cold reboot flag * cold Set the cold reboot flag * bios Reboot by jumping through the BIOS * smp Reboot by executing reset on BSP or other CPU * triple Force a triple fault (init) * kbd Use the keyboard controller. cold reset (default) * acpi Use the RESET_REG in the FADT * efi Use efi reset_system runtime service * pci Use the so-called "PCI reset register", CF9 * force Avoid anything that could hang. */ static int __init reboot_setup(char *str) { for (;;) { /* * Having anything passed on the command line via * reboot= will cause us to disable DMI checking * below. */ reboot_default = 0; switch (*str) { case 'w': reboot_mode = 0x1234; break; case 'c': reboot_mode = 0; break; #ifdef CONFIG_SMP case 's': if (isdigit(*(str+1))) { reboot_cpu = (int) (*(str+1) - '0'); if (isdigit(*(str+2))) reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); } /* * We will leave sorting out the final value * when we are ready to reboot, since we might not * have detected BSP APIC ID or smp_num_cpu */ break; #endif /* CONFIG_SMP */ case 'b': case 'a': case 'k': case 't': case 'e': case 'p': reboot_type = *str; break; case 'f': reboot_force = 1; break; } str = strchr(str, ','); if (str) str++; else break; } return 1; } __setup("reboot=", reboot_setup); /* * Reboot options and system auto-detection code provided by * Dell Inc. so their systems "just work". :-) */ /* * 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", "BIOS", d->ident); } return 0; } 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); #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(); } #ifdef CONFIG_APM_MODULE EXPORT_SYMBOL(machine_real_restart); #endif /* * 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) { reboot_type = BOOT_CF9; pr_info("%s series board detected. Selecting %s-method for reboots.\n", "PCI", d->ident); } return 0; } 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", "KBD", d->ident); } return 0; } /* * This is a single dmi_table handling all reboot quirks. */ static struct dmi_system_id __initdata reboot_dmi_table[] = { { /* 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 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 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 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 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 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 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 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 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"), }, }, { /* 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 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 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"), }, }, { /* 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 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"), }, }, { /* 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"), }, }, { /* 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 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 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 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 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 the Precision M6600. */ .callback = set_pci_reboot, .ident = "Dell OptiPlex 990", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), }, }, { /* Handle problems with rebooting on the Dell PowerEdge C6100. */ .callback = set_pci_reboot, .ident = "Dell PowerEdge C6100", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), }, }, { /* Some C6100 machines were shipped with vendor being 'Dell'. */ .callback = set_pci_reboot, .ident = "Dell PowerEdge C6100", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), }, }, { } }; static int __init reboot_init(void) { /* * Only do the DMI check if reboot_type hasn't been overridden * on the command line */ if (reboot_default) dmi_check_system(reboot_dmi_table); 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) { } /* * 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; case BOOT_BIOS: machine_real_restart(MRR_BIOS); reboot_type = BOOT_KBD; break; case BOOT_ACPI: acpi_reboot(); reboot_type = BOOT_KBD; break; case BOOT_EFI: if (efi_enabled(EFI_RUNTIME_SERVICES)) 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; /* 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; /* 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