1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef LINUX_CRASH_CORE_H 3 #define LINUX_CRASH_CORE_H 4 5 #include <linux/linkage.h> 6 #include <linux/elfcore.h> 7 #include <linux/elf.h> 8 9 struct kimage; 10 11 struct crash_mem { 12 unsigned int max_nr_ranges; 13 unsigned int nr_ranges; 14 struct range ranges[] __counted_by(max_nr_ranges); 15 }; 16 17 #ifdef CONFIG_CRASH_DUMP 18 19 int crash_shrink_memory(unsigned long new_size); 20 ssize_t crash_get_memory_size(void); 21 22 #ifndef arch_kexec_protect_crashkres 23 /* 24 * Protection mechanism for crashkernel reserved memory after 25 * the kdump kernel is loaded. 26 * 27 * Provide an empty default implementation here -- architecture 28 * code may override this 29 */ arch_kexec_protect_crashkres(void)30 static inline void arch_kexec_protect_crashkres(void) { } 31 #endif 32 33 #ifndef arch_kexec_unprotect_crashkres arch_kexec_unprotect_crashkres(void)34 static inline void arch_kexec_unprotect_crashkres(void) { } 35 #endif 36 37 38 39 #ifndef arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event(struct kimage * image,void * arg)40 static inline void arch_crash_handle_hotplug_event(struct kimage *image, void *arg) { } 41 #endif 42 43 int crash_check_hotplug_support(void); 44 45 #ifndef arch_crash_hotplug_support arch_crash_hotplug_support(struct kimage * image,unsigned long kexec_flags)46 static inline int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags) 47 { 48 return 0; 49 } 50 #endif 51 52 #ifndef crash_get_elfcorehdr_size crash_get_elfcorehdr_size(void)53 static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; } 54 #endif 55 56 /* Alignment required for elf header segment */ 57 #define ELF_CORE_HEADER_ALIGN 4096 58 59 extern int crash_exclude_mem_range(struct crash_mem *mem, 60 unsigned long long mstart, 61 unsigned long long mend); 62 extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, 63 void **addr, unsigned long *sz); 64 65 struct kimage; 66 struct kexec_segment; 67 68 #define KEXEC_CRASH_HP_NONE 0 69 #define KEXEC_CRASH_HP_ADD_CPU 1 70 #define KEXEC_CRASH_HP_REMOVE_CPU 2 71 #define KEXEC_CRASH_HP_ADD_MEMORY 3 72 #define KEXEC_CRASH_HP_REMOVE_MEMORY 4 73 #define KEXEC_CRASH_HP_INVALID_CPU -1U 74 75 extern void __crash_kexec(struct pt_regs *regs); 76 extern void crash_kexec(struct pt_regs *regs); 77 int kexec_should_crash(struct task_struct *p); 78 int kexec_crash_loaded(void); 79 void crash_save_cpu(struct pt_regs *regs, int cpu); 80 extern int kimage_crash_copy_vmcoreinfo(struct kimage *image); 81 82 #else /* !CONFIG_CRASH_DUMP*/ 83 struct pt_regs; 84 struct task_struct; 85 struct kimage; __crash_kexec(struct pt_regs * regs)86 static inline void __crash_kexec(struct pt_regs *regs) { } crash_kexec(struct pt_regs * regs)87 static inline void crash_kexec(struct pt_regs *regs) { } kexec_should_crash(struct task_struct * p)88 static inline int kexec_should_crash(struct task_struct *p) { return 0; } kexec_crash_loaded(void)89 static inline int kexec_crash_loaded(void) { return 0; } crash_save_cpu(struct pt_regs * regs,int cpu)90 static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {}; kimage_crash_copy_vmcoreinfo(struct kimage * image)91 static inline int kimage_crash_copy_vmcoreinfo(struct kimage *image) { return 0; }; 92 #endif /* CONFIG_CRASH_DUMP*/ 93 94 #endif /* LINUX_CRASH_CORE_H */ 95