projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5033cba0 | 1 | /* |
| 62a31a03 | 2 | * Architecture specific (i386/x86_64) functions for kexec based crash dumps. |
| 5033cba0 EB |
3 | * |
| 4 | * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) | |
| 5 | * | |
| 6 | * Copyright (C) IBM Corporation, 2004. All rights reserved. | |
| 7 | * | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/init.h> | |
| 11 | #include <linux/types.h> | |
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/smp.h> | |
| 5033cba0 EB |
14 | #include <linux/reboot.h> |
| 15 | #include <linux/kexec.h> | |
| 5033cba0 EB |
16 | #include <linux/delay.h> |
| 17 | #include <linux/elf.h> | |
| 18 | #include <linux/elfcore.h> | |
| 19 | ||
| 20 | #include <asm/processor.h> | |
| 21 | #include <asm/hardirq.h> | |
| 22 | #include <asm/nmi.h> | |
| 23 | #include <asm/hw_irq.h> | |
| 19842d67 | 24 | #include <asm/apic.h> |
| 0c1b2724 | 25 | #include <asm/hpet.h> |
| 1eeb66a1 | 26 | #include <linux/kdebug.h> |
| 96b89dc6 | 27 | #include <asm/cpu.h> |
| ed23dc6f | 28 | #include <asm/reboot.h> |
| 2340b62f | 29 | #include <asm/virtext.h> |
| 2fbe7b25 | 30 | |
| 7b6aa335 | 31 | #include <asm/apic.h> |
| 5033cba0 | 32 | |
| 8e294786 | 33 | |
| b2bbe71b EH |
34 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) |
| 35 | ||
| a7d41820 | 36 | static void kdump_nmi_callback(int cpu, struct die_args *args) |
| c4ac4263 | 37 | { |
| 2fbe7b25 | 38 | struct pt_regs *regs; |
| 1fb473d8 | 39 | #ifdef CONFIG_X86_32 |
| 4d55476c | 40 | struct pt_regs fixed_regs; |
| 62a31a03 | 41 | #endif |
| a7d41820 EH |
42 | |
| 43 | regs = args->regs; | |
| 44 | ||
| 45 | #ifdef CONFIG_X86_32 | |
| 46 | if (!user_mode_vm(regs)) { | |
| 47 | crash_fixup_ss_esp(&fixed_regs, regs); | |
| 48 | regs = &fixed_regs; | |
| 49 | } | |
| 50 | #endif | |
| 51 | crash_save_cpu(regs, cpu); | |
| 52 | ||
| 2340b62f EH |
53 | /* Disable VMX or SVM if needed. |
| 54 | * | |
| 55 | * We need to disable virtualization on all CPUs. | |
| 56 | * Having VMX or SVM enabled on any CPU may break rebooting | |
| 57 | * after the kdump kernel has finished its task. | |
| 58 | */ | |
| 59 | cpu_emergency_vmxoff(); | |
| 60 | cpu_emergency_svm_disable(); | |
| 61 | ||
| a7d41820 EH |
62 | disable_local_APIC(); |
| 63 | } | |
| 64 | ||
| d1e7b91c EH |
65 | static void kdump_nmi_shootdown_cpus(void) |
| 66 | { | |
| 8e294786 | 67 | nmi_shootdown_cpus(kdump_nmi_callback); |
| d1e7b91c | 68 | |
| 19842d67 | 69 | disable_local_APIC(); |
| c4ac4263 | 70 | } |
| d1e7b91c | 71 | |
| c4ac4263 | 72 | #else |
| d1e7b91c | 73 | static void kdump_nmi_shootdown_cpus(void) |
| c4ac4263 EB |
74 | { |
| 75 | /* There are no cpus to shootdown */ | |
| 76 | } | |
| 77 | #endif | |
| 78 | ||
| ed23dc6f | 79 | void native_machine_crash_shutdown(struct pt_regs *regs) |
| 5033cba0 EB |
80 | { |
| 81 | /* This function is only called after the system | |
| f18190bd | 82 | * has panicked or is otherwise in a critical state. |
| 5033cba0 EB |
83 | * The minimum amount of code to allow a kexec'd kernel |
| 84 | * to run successfully needs to happen here. | |
| 85 | * | |
| 86 | * In practice this means shooting down the other cpus in | |
| 87 | * an SMP system. | |
| 88 | */ | |
| c4ac4263 EB |
89 | /* The kernel is broken so disable interrupts */ |
| 90 | local_irq_disable(); | |
| a3ea8ac8 | 91 | |
| d1e7b91c | 92 | kdump_nmi_shootdown_cpus(); |
| 2340b62f EH |
93 | |
| 94 | /* Booting kdump kernel with VMX or SVM enabled won't work, | |
| 95 | * because (among other limitations) we can't disable paging | |
| 96 | * with the virt flags. | |
| 97 | */ | |
| 98 | cpu_emergency_vmxoff(); | |
| 99 | cpu_emergency_svm_disable(); | |
| 100 | ||
| 19842d67 VG |
101 | lapic_shutdown(); |
| 102 | #if defined(CONFIG_X86_IO_APIC) | |
| 103 | disable_IO_APIC(); | |
| 0c1b2724 OH |
104 | #endif |
| 105 | #ifdef CONFIG_HPET_TIMER | |
| 106 | hpet_disable(); | |
| 19842d67 | 107 | #endif |
| 85916f81 | 108 | crash_save_cpu(regs, safe_smp_processor_id()); |
| 5033cba0 | 109 | } |