summaryrefslogtreecommitdiff
path: root/include/linux/crash_core.h
blob: 5126a4fecb442846b589981b3a7b82f6d3846d36 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_CRASH_CORE_H
#define LINUX_CRASH_CORE_H

#include <linux/linkage.h>
#include <linux/elfcore.h>
#include <linux/elf.h>
#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
#include <asm/crash_core.h>
#endif

/* Location of a reserved region to hold the crash kernel.
 */
extern struct resource crashk_res;
extern struct resource crashk_low_res;

#define CRASH_CORE_NOTE_NAME	   "CORE"
#define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
#define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
#define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)

/*
 * The per-cpu notes area is a list of notes terminated by a "NULL"
 * note header.  For kdump, the code in vmcore.c runs in the context
 * of the second kernel to combine them into one note.
 */
#define CRASH_CORE_NOTE_BYTES	   ((CRASH_CORE_NOTE_HEAD_BYTES * 2) +	\
				     CRASH_CORE_NOTE_NAME_BYTES +	\
				     CRASH_CORE_NOTE_DESC_BYTES)

#define VMCOREINFO_BYTES	   PAGE_SIZE
#define VMCOREINFO_NOTE_NAME	   "VMCOREINFO"
#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
#define VMCOREINFO_NOTE_SIZE	   ((CRASH_CORE_NOTE_HEAD_BYTES * 2) +	\
				     VMCOREINFO_NOTE_NAME_BYTES +	\
				     VMCOREINFO_BYTES)

typedef u32 note_buf_t[CRASH_CORE_NOTE_BYTES/4];
/* Per cpu memory for storing cpu states in case of system crash. */
extern note_buf_t __percpu *crash_notes;

void crash_update_vmcoreinfo_safecopy(void *ptr);
void crash_save_vmcoreinfo(void);
void arch_crash_save_vmcoreinfo(void);
__printf(1, 2)
void vmcoreinfo_append_str(const char *fmt, ...);
phys_addr_t paddr_vmcoreinfo_note(void);

#define VMCOREINFO_OSRELEASE(value) \
	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
#define VMCOREINFO_BUILD_ID()						\
	({								\
		static_assert(sizeof(vmlinux_build_id) == 20);		\
		vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \
	})

#define VMCOREINFO_PAGESIZE(value) \
	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
#define VMCOREINFO_SYMBOL(name) \
	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
#define VMCOREINFO_SYMBOL_ARRAY(name) \
	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name)
#define VMCOREINFO_SIZE(name) \
	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
			      (unsigned long)sizeof(name))
#define VMCOREINFO_STRUCT_SIZE(name) \
	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
			      (unsigned long)sizeof(struct name))
#define VMCOREINFO_OFFSET(name, field) \
	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
			      (unsigned long)offsetof(struct name, field))
#define VMCOREINFO_TYPE_OFFSET(name, field) \
	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
			      (unsigned long)offsetof(name, field))
#define VMCOREINFO_LENGTH(name, value) \
	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
#define VMCOREINFO_NUMBER(name) \
	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
#define VMCOREINFO_CONFIG(name) \
	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)

extern unsigned char *vmcoreinfo_data;
extern size_t vmcoreinfo_size;
extern u32 *vmcoreinfo_note;

Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
			  void *data, size_t data_len);
void final_note(Elf_Word *buf);

#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
#define DEFAULT_CRASH_KERNEL_LOW_SIZE  (128UL << 20)
#endif
#endif

int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
		unsigned long long *crash_size, unsigned long long *crash_base,
		unsigned long long *low_size, bool *high);

#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
#define DEFAULT_CRASH_KERNEL_LOW_SIZE	(128UL << 20)
#endif
#ifndef CRASH_ALIGN
#define CRASH_ALIGN			SZ_2M
#endif
#ifndef CRASH_ADDR_LOW_MAX
#define CRASH_ADDR_LOW_MAX		SZ_4G
#endif
#ifndef CRASH_ADDR_HIGH_MAX
#define CRASH_ADDR_HIGH_MAX		memblock_end_of_DRAM()
#endif

void __init reserve_crashkernel_generic(char *cmdline,
		unsigned long long crash_size,
		unsigned long long crash_base,
		unsigned long long crash_low_size,
		bool high);
#else
static inline void __init reserve_crashkernel_generic(char *cmdline,
		unsigned long long crash_size,
		unsigned long long crash_base,
		unsigned long long crash_low_size,
		bool high)
{}
#endif

/* Alignment required for elf header segment */
#define ELF_CORE_HEADER_ALIGN   4096

struct crash_mem {
	unsigned int max_nr_ranges;
	unsigned int nr_ranges;
	struct range ranges[] __counted_by(max_nr_ranges);
};

extern int crash_exclude_mem_range(struct crash_mem *mem,
				   unsigned long long mstart,
				   unsigned long long mend);
extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
				       void **addr, unsigned long *sz);

struct kimage;
struct kexec_segment;

#define KEXEC_CRASH_HP_NONE			0
#define KEXEC_CRASH_HP_ADD_CPU			1
#define KEXEC_CRASH_HP_REMOVE_CPU		2
#define KEXEC_CRASH_HP_ADD_MEMORY		3
#define KEXEC_CRASH_HP_REMOVE_MEMORY		4
#define KEXEC_CRASH_HP_INVALID_CPU		-1U

#endif /* LINUX_CRASH_CORE_H */