123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133 |
- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef LINUX_CRASH_DUMP_H
- #define LINUX_CRASH_DUMP_H
- #include <linux/kexec.h>
- #include <linux/proc_fs.h>
- #include <linux/elf.h>
- #include <uapi/linux/vmcore.h>
- #include <asm/pgtable.h> /* for pgprot_t */
- #ifdef CONFIG_CRASH_DUMP
- #define ELFCORE_ADDR_MAX (-1ULL)
- #define ELFCORE_ADDR_ERR (-2ULL)
- extern unsigned long long elfcorehdr_addr;
- extern unsigned long long elfcorehdr_size;
- extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
- extern void elfcorehdr_free(unsigned long long addr);
- extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);
- extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos);
- extern int remap_oldmem_pfn_range(struct vm_area_struct *vma,
- unsigned long from, unsigned long pfn,
- unsigned long size, pgprot_t prot);
- extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
- unsigned long, int);
- extern ssize_t copy_oldmem_page_encrypted(unsigned long pfn, char *buf,
- size_t csize, unsigned long offset,
- int userbuf);
- void vmcore_cleanup(void);
- /* Architecture code defines this if there are other possible ELF
- * machine types, e.g. on bi-arch capable hardware. */
- #ifndef vmcore_elf_check_arch_cross
- #define vmcore_elf_check_arch_cross(x) 0
- #endif
- /*
- * Architecture code can redefine this if there are any special checks
- * needed for 32-bit ELF or 64-bit ELF vmcores. In case of 32-bit
- * only architecture, vmcore_elf64_check_arch can be set to zero.
- */
- #ifndef vmcore_elf32_check_arch
- #define vmcore_elf32_check_arch(x) elf_check_arch(x)
- #endif
- #ifndef vmcore_elf64_check_arch
- #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
- #endif
- /*
- * is_kdump_kernel() checks whether this kernel is booting after a panic of
- * previous kernel or not. This is determined by checking if previous kernel
- * has passed the elf core header address on command line.
- *
- * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
- * return true if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic
- * of previous kernel.
- */
- static inline bool is_kdump_kernel(void)
- {
- return elfcorehdr_addr != ELFCORE_ADDR_MAX;
- }
- /* is_vmcore_usable() checks if the kernel is booting after a panic and
- * the vmcore region is usable.
- *
- * This makes use of the fact that due to alignment -2ULL is not
- * a valid pointer, much in the vain of IS_ERR(), except
- * dealing directly with an unsigned long long rather than a pointer.
- */
- static inline int is_vmcore_usable(void)
- {
- return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
- }
- /* vmcore_unusable() marks the vmcore as unusable,
- * without disturbing the logic of is_kdump_kernel()
- */
- static inline void vmcore_unusable(void)
- {
- if (is_kdump_kernel())
- elfcorehdr_addr = ELFCORE_ADDR_ERR;
- }
- #define HAVE_OLDMEM_PFN_IS_RAM 1
- extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn));
- extern void unregister_oldmem_pfn_is_ram(void);
- #else /* !CONFIG_CRASH_DUMP */
- static inline bool is_kdump_kernel(void) { return 0; }
- #endif /* CONFIG_CRASH_DUMP */
- extern unsigned long saved_max_pfn;
- /* Device Dump information to be filled by drivers */
- struct vmcoredd_data {
- char dump_name[VMCOREDD_MAX_NAME_BYTES]; /* Unique name of the dump */
- unsigned int size; /* Size of the dump */
- /* Driver's registered callback to be invoked to collect dump */
- int (*vmcoredd_callback)(struct vmcoredd_data *data, void *buf);
- };
- #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
- int vmcore_add_device_dump(struct vmcoredd_data *data);
- #else
- static inline int vmcore_add_device_dump(struct vmcoredd_data *data)
- {
- return -EOPNOTSUPP;
- }
- #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
- #ifdef CONFIG_PROC_VMCORE
- ssize_t read_from_oldmem(char *buf, size_t count,
- u64 *ppos, int userbuf,
- bool encrypted);
- #else
- static inline ssize_t read_from_oldmem(char *buf, size_t count,
- u64 *ppos, int userbuf,
- bool encrypted)
- {
- return -EOPNOTSUPP;
- }
- #endif /* CONFIG_PROC_VMCORE */
- #endif /* LINUX_CRASHDUMP_H */
|