Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 1 | /* |
Hiroshi Shimamoto | 62a31a0 | 2007-10-19 18:24:20 -0700 | [diff] [blame] | 2 | * Architecture specific (i386/x86_64) functions for kexec based crash dumps. |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 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> |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 14 | #include <linux/reboot.h> |
| 15 | #include <linux/kexec.h> |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 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> |
Vivek Goyal | 19842d6 | 2005-11-15 00:09:04 -0800 | [diff] [blame] | 24 | #include <asm/apic.h> |
OGAWA Hirofumi | 0c1b272 | 2007-12-03 17:17:10 +0100 | [diff] [blame] | 25 | #include <asm/hpet.h> |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 26 | #include <linux/kdebug.h> |
Jaswinder Singh Rajput | 96b89dc6 | 2009-01-07 21:35:48 +0530 | [diff] [blame] | 27 | #include <asm/cpu.h> |
Glauber Costa | ed23dc6 | 2008-03-17 16:08:38 -0300 | [diff] [blame] | 28 | #include <asm/reboot.h> |
Eduardo Habkost | 2340b62 | 2008-11-17 19:03:23 -0200 | [diff] [blame] | 29 | #include <asm/virtext.h> |
Joerg Roedel | 61d047b | 2009-06-09 17:56:09 +0200 | [diff] [blame] | 30 | #include <asm/iommu.h> |
Don Zickus | 2fbe7b2 | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 31 | |
Eduardo Habkost | 8e29478 | 2008-11-12 11:34:40 -0200 | [diff] [blame] | 32 | |
Eduardo Habkost | b2bbe71 | 2008-11-12 11:34:38 -0200 | [diff] [blame] | 33 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) |
| 34 | |
Eduardo Habkost | a7d4182 | 2008-11-12 11:34:37 -0200 | [diff] [blame] | 35 | static void kdump_nmi_callback(int cpu, struct die_args *args) |
Eric W. Biederman | c4ac426 | 2005-06-25 14:57:58 -0700 | [diff] [blame] | 36 | { |
Don Zickus | 2fbe7b2 | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 37 | struct pt_regs *regs; |
Mike Galbraith | 1fb473d | 2007-10-24 12:58:01 +0200 | [diff] [blame] | 38 | #ifdef CONFIG_X86_32 |
Vivek Goyal | 4d55476 | 2005-06-25 14:58:13 -0700 | [diff] [blame] | 39 | struct pt_regs fixed_regs; |
Hiroshi Shimamoto | 62a31a0 | 2007-10-19 18:24:20 -0700 | [diff] [blame] | 40 | #endif |
Eduardo Habkost | a7d4182 | 2008-11-12 11:34:37 -0200 | [diff] [blame] | 41 | |
| 42 | regs = args->regs; |
| 43 | |
| 44 | #ifdef CONFIG_X86_32 |
| 45 | if (!user_mode_vm(regs)) { |
| 46 | crash_fixup_ss_esp(&fixed_regs, regs); |
| 47 | regs = &fixed_regs; |
| 48 | } |
| 49 | #endif |
| 50 | crash_save_cpu(regs, cpu); |
| 51 | |
Eduardo Habkost | 2340b62 | 2008-11-17 19:03:23 -0200 | [diff] [blame] | 52 | /* Disable VMX or SVM if needed. |
| 53 | * |
| 54 | * We need to disable virtualization on all CPUs. |
| 55 | * Having VMX or SVM enabled on any CPU may break rebooting |
| 56 | * after the kdump kernel has finished its task. |
| 57 | */ |
| 58 | cpu_emergency_vmxoff(); |
| 59 | cpu_emergency_svm_disable(); |
| 60 | |
Eduardo Habkost | a7d4182 | 2008-11-12 11:34:37 -0200 | [diff] [blame] | 61 | disable_local_APIC(); |
| 62 | } |
| 63 | |
Eduardo Habkost | d1e7b91 | 2008-11-12 11:34:39 -0200 | [diff] [blame] | 64 | static void kdump_nmi_shootdown_cpus(void) |
| 65 | { |
Eduardo Habkost | 8e29478 | 2008-11-12 11:34:40 -0200 | [diff] [blame] | 66 | nmi_shootdown_cpus(kdump_nmi_callback); |
Eduardo Habkost | d1e7b91 | 2008-11-12 11:34:39 -0200 | [diff] [blame] | 67 | |
Vivek Goyal | 19842d6 | 2005-11-15 00:09:04 -0800 | [diff] [blame] | 68 | disable_local_APIC(); |
Eric W. Biederman | c4ac426 | 2005-06-25 14:57:58 -0700 | [diff] [blame] | 69 | } |
Eduardo Habkost | d1e7b91 | 2008-11-12 11:34:39 -0200 | [diff] [blame] | 70 | |
Eric W. Biederman | c4ac426 | 2005-06-25 14:57:58 -0700 | [diff] [blame] | 71 | #else |
Eduardo Habkost | d1e7b91 | 2008-11-12 11:34:39 -0200 | [diff] [blame] | 72 | static void kdump_nmi_shootdown_cpus(void) |
Eric W. Biederman | c4ac426 | 2005-06-25 14:57:58 -0700 | [diff] [blame] | 73 | { |
| 74 | /* There are no cpus to shootdown */ |
| 75 | } |
| 76 | #endif |
| 77 | |
Glauber Costa | ed23dc6 | 2008-03-17 16:08:38 -0300 | [diff] [blame] | 78 | void native_machine_crash_shutdown(struct pt_regs *regs) |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 79 | { |
| 80 | /* This function is only called after the system |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 81 | * has panicked or is otherwise in a critical state. |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 82 | * The minimum amount of code to allow a kexec'd kernel |
| 83 | * to run successfully needs to happen here. |
| 84 | * |
| 85 | * In practice this means shooting down the other cpus in |
| 86 | * an SMP system. |
| 87 | */ |
Eric W. Biederman | c4ac426 | 2005-06-25 14:57:58 -0700 | [diff] [blame] | 88 | /* The kernel is broken so disable interrupts */ |
| 89 | local_irq_disable(); |
Vivek Goyal | a3ea8ac | 2005-06-25 14:58:14 -0700 | [diff] [blame] | 90 | |
Eduardo Habkost | d1e7b91 | 2008-11-12 11:34:39 -0200 | [diff] [blame] | 91 | kdump_nmi_shootdown_cpus(); |
Eduardo Habkost | 2340b62 | 2008-11-17 19:03:23 -0200 | [diff] [blame] | 92 | |
| 93 | /* Booting kdump kernel with VMX or SVM enabled won't work, |
| 94 | * because (among other limitations) we can't disable paging |
| 95 | * with the virt flags. |
| 96 | */ |
| 97 | cpu_emergency_vmxoff(); |
| 98 | cpu_emergency_svm_disable(); |
| 99 | |
Vivek Goyal | 19842d6 | 2005-11-15 00:09:04 -0800 | [diff] [blame] | 100 | lapic_shutdown(); |
| 101 | #if defined(CONFIG_X86_IO_APIC) |
| 102 | disable_IO_APIC(); |
| 103 | #endif |
OGAWA Hirofumi | 0c1b272 | 2007-12-03 17:17:10 +0100 | [diff] [blame] | 104 | #ifdef CONFIG_HPET_TIMER |
| 105 | hpet_disable(); |
| 106 | #endif |
Joerg Roedel | 61d047b | 2009-06-09 17:56:09 +0200 | [diff] [blame] | 107 | |
| 108 | #ifdef CONFIG_X86_64 |
| 109 | pci_iommu_shutdown(); |
| 110 | #endif |
| 111 | |
Magnus Damm | 85916f8 | 2006-12-06 20:40:41 -0800 | [diff] [blame] | 112 | crash_save_cpu(regs, safe_smp_processor_id()); |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 113 | } |