| /* 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 <linux/pgtable.h> |
| #include <uapi/linux/vmcore.h> |
| |
| #include <linux/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 */ |
| |
| /* 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 */ |