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Linux/include/linux/crash_dump.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef LINUX_CRASH_DUMP_H
  3 #define LINUX_CRASH_DUMP_H
  4 
  5 #include <linux/kexec.h>
  6 #include <linux/proc_fs.h>
  7 #include <linux/elf.h>
  8 #include <linux/pgtable.h>
  9 #include <uapi/linux/vmcore.h>
 10 
 11 #include <linux/pgtable.h> /* for pgprot_t */
 12 
 13 #ifdef CONFIG_CRASH_DUMP
 14 #define ELFCORE_ADDR_MAX        (-1ULL)
 15 #define ELFCORE_ADDR_ERR        (-2ULL)
 16 
 17 extern unsigned long long elfcorehdr_addr;
 18 extern unsigned long long elfcorehdr_size;
 19 
 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);
 27 
 28 extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
 29                                                 unsigned long, int);
 30 extern ssize_t copy_oldmem_page_encrypted(unsigned long pfn, char *buf,
 31                                           size_t csize, unsigned long offset,
 32                                           int userbuf);
 33 
 34 void vmcore_cleanup(void);
 35 
 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 
 42 /*
 43  * Architecture code can redefine this if there are any special checks
 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.
 46  */
 47 #ifndef vmcore_elf32_check_arch
 48 #define vmcore_elf32_check_arch(x) elf_check_arch(x)
 49 #endif
 50 
 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
 54 
 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
 61  * return true if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic
 62  * of previous kernel.
 63  */
 64 
 65 static inline bool is_kdump_kernel(void)
 66 {
 67         return elfcorehdr_addr != ELFCORE_ADDR_MAX;
 68 }
 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 }
 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 
 97 #else /* !CONFIG_CRASH_DUMP */
 98 static inline bool is_kdump_kernel(void) { return 0; }
 99 #endif /* CONFIG_CRASH_DUMP */
100 
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 */
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 
131 #endif /* LINUX_CRASHDUMP_H */
132 

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