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