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 | ||
a7d41820 | 35 | static void kdump_nmi_callback(int cpu, struct die_args *args) |
c4ac4263 | 36 | { |
2fbe7b25 | 37 | struct pt_regs *regs; |
1fb473d8 | 38 | #ifdef CONFIG_X86_32 |
4d55476c | 39 | struct pt_regs fixed_regs; |
62a31a03 | 40 | #endif |
a7d41820 EH |
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 | ||
2340b62f EH |
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 | ||
a7d41820 EH |
61 | disable_local_APIC(); |
62 | } | |
63 | ||
d1e7b91c EH |
64 | static void kdump_nmi_shootdown_cpus(void) |
65 | { | |
5edd19af | 66 | in_crash_kexec = 1; |
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 | } |