1 files changed, 56 insertions, 108 deletions

diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 9eaeaafe0cad..d33352c2e386 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -5,129 +5,58 @@
 #include <linux/linkage.h>
 #include <linux/elfcore.h>
 #include <linux/elf.h>
-#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
-#include <asm/crash_core.h>
-#endif
 
-/* Location of a reserved region to hold the crash kernel.
- */
-extern struct resource crashk_res;
-extern struct resource crashk_low_res;
+struct kimage;
+
+struct crash_mem {
+	unsigned int max_nr_ranges;
+	unsigned int nr_ranges;
+	struct range ranges[] __counted_by(max_nr_ranges);
+};
 
-#define CRASH_CORE_NOTE_NAME	   "CORE"
-#define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
-#define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
-#define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
+#ifdef CONFIG_CRASH_DUMP
 
+int crash_shrink_memory(unsigned long new_size);
+ssize_t crash_get_memory_size(void);
+
+#ifndef arch_kexec_protect_crashkres
 /*
- * The per-cpu notes area is a list of notes terminated by a "NULL"
- * note header.  For kdump, the code in vmcore.c runs in the context
- * of the second kernel to combine them into one note.
+ * Protection mechanism for crashkernel reserved memory after
+ * the kdump kernel is loaded.
+ *
+ * Provide an empty default implementation here -- architecture
+ * code may override this
  */
-#define CRASH_CORE_NOTE_BYTES	   ((CRASH_CORE_NOTE_HEAD_BYTES * 2) +	\
-				     CRASH_CORE_NOTE_NAME_BYTES +	\
-				     CRASH_CORE_NOTE_DESC_BYTES)
-
-#define VMCOREINFO_BYTES	   PAGE_SIZE
-#define VMCOREINFO_NOTE_NAME	   "VMCOREINFO"
-#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
-#define VMCOREINFO_NOTE_SIZE	   ((CRASH_CORE_NOTE_HEAD_BYTES * 2) +	\
-				     VMCOREINFO_NOTE_NAME_BYTES +	\
-				     VMCOREINFO_BYTES)
-
-typedef u32 note_buf_t[CRASH_CORE_NOTE_BYTES/4];
-/* Per cpu memory for storing cpu states in case of system crash. */
-extern note_buf_t __percpu *crash_notes;
-
-void crash_update_vmcoreinfo_safecopy(void *ptr);
-void crash_save_vmcoreinfo(void);
-void arch_crash_save_vmcoreinfo(void);
-__printf(1, 2)
-void vmcoreinfo_append_str(const char *fmt, ...);
-phys_addr_t paddr_vmcoreinfo_note(void);
-
-#define VMCOREINFO_OSRELEASE(value) \
-	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
-#define VMCOREINFO_BUILD_ID()						\
-	({								\
-		static_assert(sizeof(vmlinux_build_id) == 20);		\
-		vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \
-	})
-
-#define VMCOREINFO_PAGESIZE(value) \
-	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
-#define VMCOREINFO_SYMBOL(name) \
-	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
-#define VMCOREINFO_SYMBOL_ARRAY(name) \
-	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name)
-#define VMCOREINFO_SIZE(name) \
-	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
-			      (unsigned long)sizeof(name))
-#define VMCOREINFO_STRUCT_SIZE(name) \
-	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
-			      (unsigned long)sizeof(struct name))
-#define VMCOREINFO_OFFSET(name, field) \
-	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
-			      (unsigned long)offsetof(struct name, field))
-#define VMCOREINFO_TYPE_OFFSET(name, field) \
-	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
-			      (unsigned long)offsetof(name, field))
-#define VMCOREINFO_LENGTH(name, value) \
-	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
-#define VMCOREINFO_NUMBER(name) \
-	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
-#define VMCOREINFO_CONFIG(name) \
-	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
-
-extern unsigned char *vmcoreinfo_data;
-extern size_t vmcoreinfo_size;
-extern u32 *vmcoreinfo_note;
-
-Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
-			  void *data, size_t data_len);
-void final_note(Elf_Word *buf);
-
-int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
-		unsigned long long *crash_size, unsigned long long *crash_base,
-		unsigned long long *low_size, bool *high);
-
-#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
-#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
-#define DEFAULT_CRASH_KERNEL_LOW_SIZE	(128UL << 20)
+static inline void arch_kexec_protect_crashkres(void) { }
 #endif
-#ifndef CRASH_ALIGN
-#define CRASH_ALIGN			SZ_2M
+
+#ifndef arch_kexec_unprotect_crashkres
+static inline void arch_kexec_unprotect_crashkres(void) { }
 #endif
-#ifndef CRASH_ADDR_LOW_MAX
-#define CRASH_ADDR_LOW_MAX		SZ_4G
+
+
+
+#ifndef arch_crash_handle_hotplug_event
+static inline void arch_crash_handle_hotplug_event(struct kimage *image) { }
 #endif
-#ifndef CRASH_ADDR_HIGH_MAX
-#define CRASH_ADDR_HIGH_MAX		memblock_end_of_DRAM()
+
+int crash_check_update_elfcorehdr(void);
+
+#ifndef crash_hotplug_cpu_support
+static inline int crash_hotplug_cpu_support(void) { return 0; }
+#endif
+
+#ifndef crash_hotplug_memory_support
+static inline int crash_hotplug_memory_support(void) { return 0; }
 #endif
 
-void __init reserve_crashkernel_generic(char *cmdline,
-		unsigned long long crash_size,
-		unsigned long long crash_base,
-		unsigned long long crash_low_size,
-		bool high);
-#else
-static inline void __init reserve_crashkernel_generic(char *cmdline,
-		unsigned long long crash_size,
-		unsigned long long crash_base,
-		unsigned long long crash_low_size,
-		bool high)
-{}
+#ifndef crash_get_elfcorehdr_size
+static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; }
 #endif
 
 /* Alignment required for elf header segment */
 #define ELF_CORE_HEADER_ALIGN   4096
 
-struct crash_mem {
-	unsigned int max_nr_ranges;
-	unsigned int nr_ranges;
-	struct range ranges[] __counted_by(max_nr_ranges);
-};
-
 extern int crash_exclude_mem_range(struct crash_mem *mem,
 				   unsigned long long mstart,
 				   unsigned long long mend);
@@ -144,4 +73,23 @@ struct kexec_segment;
 #define KEXEC_CRASH_HP_REMOVE_MEMORY		4
 #define KEXEC_CRASH_HP_INVALID_CPU		-1U
 
+extern void __crash_kexec(struct pt_regs *regs);
+extern void crash_kexec(struct pt_regs *regs);
+int kexec_should_crash(struct task_struct *p);
+int kexec_crash_loaded(void);
+void crash_save_cpu(struct pt_regs *regs, int cpu);
+extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
+
+#else /* !CONFIG_CRASH_DUMP*/
+struct pt_regs;
+struct task_struct;
+struct kimage;
+static inline void __crash_kexec(struct pt_regs *regs) { }
+static inline void crash_kexec(struct pt_regs *regs) { }
+static inline int kexec_should_crash(struct task_struct *p) { return 0; }
+static inline int kexec_crash_loaded(void) { return 0; }
+static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {};
+static inline int kimage_crash_copy_vmcoreinfo(struct kimage *image) { return 0; };
+#endif /* CONFIG_CRASH_DUMP*/
+
 #endif /* LINUX_CRASH_CORE_H */