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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
60e64d46 VG |
2 | #ifndef LINUX_CRASH_DUMP_H |
3 | #define LINUX_CRASH_DUMP_H | |
4 | ||
60e64d46 | 5 | #include <linux/kexec.h> |
60e64d46 | 6 | #include <linux/proc_fs.h> |
1f536b9e | 7 | #include <linux/elf.h> |
65fddcfc | 8 | #include <linux/pgtable.h> |
2724273e | 9 | #include <uapi/linux/vmcore.h> |
60e64d46 | 10 | |
ca5999fd | 11 | #include <linux/pgtable.h> /* for pgprot_t */ |
5a610fcc | 12 | |
2650cb0c | 13 | #ifdef CONFIG_CRASH_DUMP |
666bfddb | 14 | #define ELFCORE_ADDR_MAX (-1ULL) |
85a0ee34 | 15 | #define ELFCORE_ADDR_ERR (-2ULL) |
36ac2617 | 16 | |
2030eae5 | 17 | extern unsigned long long elfcorehdr_addr; |
d3bf3795 | 18 | extern unsigned long long elfcorehdr_size; |
36ac2617 | 19 | |
5ab03ac5 BH |
20 | extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size); |
21 | extern void elfcorehdr_free(unsigned long long addr); | |
22 | extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos); | |
23 | extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos); | |
24 | extern int remap_oldmem_pfn_range(struct vm_area_struct *vma, | |
25 | unsigned long from, unsigned long pfn, | |
26 | unsigned long size, pgprot_t prot); | |
be8a8d06 | 27 | |
60e64d46 VG |
28 | extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, |
29 | unsigned long, int); | |
992b649a LJ |
30 | extern ssize_t copy_oldmem_page_encrypted(unsigned long pfn, char *buf, |
31 | size_t csize, unsigned long offset, | |
32 | int userbuf); | |
33 | ||
82e0703b | 34 | void vmcore_cleanup(void); |
666bfddb | 35 | |
79e03011 IC |
36 | /* Architecture code defines this if there are other possible ELF |
37 | * machine types, e.g. on bi-arch capable hardware. */ | |
38 | #ifndef vmcore_elf_check_arch_cross | |
39 | #define vmcore_elf_check_arch_cross(x) 0 | |
40 | #endif | |
41 | ||
9833c394 MW |
42 | /* |
43 | * Architecture code can redefine this if there are any special checks | |
e55d5312 DW |
44 | * needed for 32-bit ELF or 64-bit ELF vmcores. In case of 32-bit |
45 | * only architecture, vmcore_elf64_check_arch can be set to zero. | |
9833c394 | 46 | */ |
e55d5312 DW |
47 | #ifndef vmcore_elf32_check_arch |
48 | #define vmcore_elf32_check_arch(x) elf_check_arch(x) | |
49 | #endif | |
50 | ||
9833c394 MW |
51 | #ifndef vmcore_elf64_check_arch |
52 | #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) | |
53 | #endif | |
79e03011 | 54 | |
57cac4d1 VG |
55 | /* |
56 | * is_kdump_kernel() checks whether this kernel is booting after a panic of | |
57 | * previous kernel or not. This is determined by checking if previous kernel | |
58 | * has passed the elf core header address on command line. | |
59 | * | |
60 | * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will | |
2650cb0c YB |
61 | * return true if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic |
62 | * of previous kernel. | |
57cac4d1 VG |
63 | */ |
64 | ||
2650cb0c | 65 | static inline bool is_kdump_kernel(void) |
95b68dec | 66 | { |
2650cb0c | 67 | return elfcorehdr_addr != ELFCORE_ADDR_MAX; |
95b68dec | 68 | } |
85a0ee34 SH |
69 | |
70 | /* is_vmcore_usable() checks if the kernel is booting after a panic and | |
71 | * the vmcore region is usable. | |
72 | * | |
73 | * This makes use of the fact that due to alignment -2ULL is not | |
74 | * a valid pointer, much in the vain of IS_ERR(), except | |
75 | * dealing directly with an unsigned long long rather than a pointer. | |
76 | */ | |
77 | ||
78 | static inline int is_vmcore_usable(void) | |
79 | { | |
80 | return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; | |
81 | } | |
82 | ||
83 | /* vmcore_unusable() marks the vmcore as unusable, | |
84 | * without disturbing the logic of is_kdump_kernel() | |
85 | */ | |
86 | ||
87 | static inline void vmcore_unusable(void) | |
88 | { | |
89 | if (is_kdump_kernel()) | |
90 | elfcorehdr_addr = ELFCORE_ADDR_ERR; | |
91 | } | |
997c136f OH |
92 | |
93 | #define HAVE_OLDMEM_PFN_IS_RAM 1 | |
94 | extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn)); | |
95 | extern void unregister_oldmem_pfn_is_ram(void); | |
96 | ||
95b68dec | 97 | #else /* !CONFIG_CRASH_DUMP */ |
2650cb0c | 98 | static inline bool is_kdump_kernel(void) { return 0; } |
60e64d46 | 99 | #endif /* CONFIG_CRASH_DUMP */ |
95b68dec | 100 | |
2724273e RL |
101 | /* Device Dump information to be filled by drivers */ |
102 | struct vmcoredd_data { | |
103 | char dump_name[VMCOREDD_MAX_NAME_BYTES]; /* Unique name of the dump */ | |
104 | unsigned int size; /* Size of the dump */ | |
105 | /* Driver's registered callback to be invoked to collect dump */ | |
106 | int (*vmcoredd_callback)(struct vmcoredd_data *data, void *buf); | |
107 | }; | |
108 | ||
109 | #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP | |
110 | int vmcore_add_device_dump(struct vmcoredd_data *data); | |
111 | #else | |
112 | static inline int vmcore_add_device_dump(struct vmcoredd_data *data) | |
113 | { | |
114 | return -EOPNOTSUPP; | |
115 | } | |
116 | #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */ | |
ae7eb82a TJB |
117 | |
118 | #ifdef CONFIG_PROC_VMCORE | |
119 | ssize_t read_from_oldmem(char *buf, size_t count, | |
120 | u64 *ppos, int userbuf, | |
121 | bool encrypted); | |
122 | #else | |
123 | static inline ssize_t read_from_oldmem(char *buf, size_t count, | |
124 | u64 *ppos, int userbuf, | |
125 | bool encrypted) | |
126 | { | |
127 | return -EOPNOTSUPP; | |
128 | } | |
129 | #endif /* CONFIG_PROC_VMCORE */ | |
130 | ||
60e64d46 | 131 | #endif /* LINUX_CRASHDUMP_H */ |