include/linux/crash_core.h

   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  */
  30 static inline void arch_kexec_protect_crashkres(void) { }
  31 #endif
  32
  33 #ifndef arch_kexec_unprotect_crashkres
  34 static inline void arch_kexec_unprotect_crashkres(void) { }
  35 #endif
  36
  37
  38
  39 #ifndef arch_crash_handle_hotplug_event
  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
  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
  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;
  86 static inline void __crash_kexec(struct pt_regs *regs) { }
  87 static inline void crash_kexec(struct pt_regs *regs) { }
  88 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
  89 static inline int kexec_crash_loaded(void) { return 0; }
  90 static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {};
  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 */