projects / linux-2.6-block.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> |
| 8e294786 | 30 | |
| 5edd19af CW |
31 | int in_crash_kexec; |
| 32 | ||
| b2bbe71b EH |
33 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) |
| 34 | ||
| 9c48f1c6 | 35 | static void kdump_nmi_callback(int cpu, struct pt_regs *regs) |
| c4ac4263 | 36 | { |
| 1fb473d8 | 37 | #ifdef CONFIG_X86_32 |
| 4d55476c | 38 | struct pt_regs fixed_regs; |
| 62a31a03 | 39 | #endif |
| a7d41820 | 40 | |
| a7d41820 EH |
41 | #ifdef CONFIG_X86_32 |
| 42 | if (!user_mode_vm(regs)) { | |
| 43 | crash_fixup_ss_esp(&fixed_regs, regs); | |
| 44 | regs = &fixed_regs; | |
| 45 | } | |
| 46 | #endif | |
| 47 | crash_save_cpu(regs, cpu); | |
| 48 | ||
| 2340b62f EH |
49 | /* Disable VMX or SVM if needed. |
| 50 | * | |
| 51 | * We need to disable virtualization on all CPUs. | |
| 52 | * Having VMX or SVM enabled on any CPU may break rebooting | |
| 53 | * after the kdump kernel has finished its task. | |
| 54 | */ | |
| 55 | cpu_emergency_vmxoff(); | |
| 56 | cpu_emergency_svm_disable(); | |
| 57 | ||
| a7d41820 EH |
58 | disable_local_APIC(); |
| 59 | } | |
| 60 | ||
| d1e7b91c EH |
61 | static void kdump_nmi_shootdown_cpus(void) |
| 62 | { | |
| 5edd19af | 63 | in_crash_kexec = 1; |
| 8e294786 | 64 | nmi_shootdown_cpus(kdump_nmi_callback); |
| d1e7b91c | 65 | |
| 19842d67 | 66 | disable_local_APIC(); |
| c4ac4263 | 67 | } |
| d1e7b91c | 68 | |
| c4ac4263 | 69 | #else |
| d1e7b91c | 70 | static void kdump_nmi_shootdown_cpus(void) |
| c4ac4263 EB |
71 | { |
| 72 | /* There are no cpus to shootdown */ | |
| 73 | } | |
| 74 | #endif | |
| 75 | ||
| ed23dc6f | 76 | void native_machine_crash_shutdown(struct pt_regs *regs) |
| 5033cba0 EB |
77 | { |
| 78 | /* This function is only called after the system | |
| f18190bd | 79 | * has panicked or is otherwise in a critical state. |
| 5033cba0 EB |
80 | * The minimum amount of code to allow a kexec'd kernel |
| 81 | * to run successfully needs to happen here. | |
| 82 | * | |
| 83 | * In practice this means shooting down the other cpus in | |
| 84 | * an SMP system. | |
| 85 | */ | |
| c4ac4263 EB |
86 | /* The kernel is broken so disable interrupts */ |
| 87 | local_irq_disable(); | |
| a3ea8ac8 | 88 | |
| d1e7b91c | 89 | kdump_nmi_shootdown_cpus(); |
| 2340b62f EH |
90 | |
| 91 | /* Booting kdump kernel with VMX or SVM enabled won't work, | |
| 92 | * because (among other limitations) we can't disable paging | |
| 93 | * with the virt flags. | |
| 94 | */ | |
| 95 | cpu_emergency_vmxoff(); | |
| 96 | cpu_emergency_svm_disable(); | |
| 97 | ||
| 19842d67 VG |
98 | lapic_shutdown(); |
| 99 | #if defined(CONFIG_X86_IO_APIC) | |
| 100 | disable_IO_APIC(); | |
| 0c1b2724 OH |
101 | #endif |
| 102 | #ifdef CONFIG_HPET_TIMER | |
| 103 | hpet_disable(); | |
| 19842d67 | 104 | #endif |
| 85916f81 | 105 | crash_save_cpu(regs, safe_smp_processor_id()); |
| 5033cba0 | 106 | } |