arch/powerpc/include/asm/kexec.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_KEXEC_H
   3 #define _ASM_POWERPC_KEXEC_H
   4 #ifdef __KERNEL__
   5
   6 #if defined(CONFIG_PPC_85xx) || defined(CONFIG_44x)
   7
   8 /*
   9  * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
  10  * and therefore we can only deal with memory within this range
  11  */
  12 #define KEXEC_SOURCE_MEMORY_LIMIT       (2 * 1024 * 1024 * 1024UL - 1)
  13 #define KEXEC_DESTINATION_MEMORY_LIMIT  (2 * 1024 * 1024 * 1024UL - 1)
  14 #define KEXEC_CONTROL_MEMORY_LIMIT      (2 * 1024 * 1024 * 1024UL - 1)
  15
  16 #else
  17
  18 /*
  19  * Maximum page that is mapped directly into kernel memory.
  20  * XXX: Since we copy virt we can use any page we allocate
  21  */
  22 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  23
  24 /*
  25  * Maximum address we can reach in physical address mode.
  26  * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
  27  */
  28 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  29
  30 /* Maximum address we can use for the control code buffer */
  31 #ifdef __powerpc64__
  32 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
  33 #else
  34 /* TASK_SIZE, probably left over from use_mm ?? */
  35 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  36 #endif
  37 #endif
  38
  39 #define KEXEC_CONTROL_PAGE_SIZE 4096
  40
  41 /* The native architecture */
  42 #ifdef __powerpc64__
  43 #define KEXEC_ARCH KEXEC_ARCH_PPC64
  44 #else
  45 #define KEXEC_ARCH KEXEC_ARCH_PPC
  46 #endif
  47
  48 #define KEXEC_STATE_NONE 0
  49 #define KEXEC_STATE_IRQS_OFF 1
  50 #define KEXEC_STATE_REAL_MODE 2
  51
  52 #ifndef __ASSEMBLY__
  53 #include <asm/reg.h>
  54
  55 typedef void (*crash_shutdown_t)(void);
  56
  57 #ifdef CONFIG_KEXEC_CORE
  58 struct kimage;
  59 struct pt_regs;
  60
  61 extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
  62                                           master to copy new code to 0 */
  63 extern void default_machine_kexec(struct kimage *image);
  64 extern void machine_kexec_mask_interrupts(void);
  65
  66 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
  67                          unsigned long start_address) __noreturn;
  68 void kexec_copy_flush(struct kimage *image);
  69
  70 #ifdef CONFIG_KEXEC_FILE
  71 extern const struct kexec_file_ops kexec_elf64_ops;
  72
  73 #define ARCH_HAS_KIMAGE_ARCH
  74
  75 struct kimage_arch {
  76         struct crash_mem *exclude_ranges;
  77
  78         unsigned long backup_start;
  79         void *backup_buf;
  80         void *fdt;
  81 };
  82
  83 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
  84                           unsigned long cmdline_len);
  85 int setup_purgatory(struct kimage *image, const void *slave_code,
  86                     const void *fdt, unsigned long kernel_load_addr,
  87                     unsigned long fdt_load_addr);
  88
  89 #ifdef CONFIG_PPC64
  90 struct kexec_buf;
  91
  92 int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
  93 #define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
  94
  95 int arch_kimage_file_post_load_cleanup(struct kimage *image);
  96 #define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
  97
  98 int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
  99 #define arch_kexec_locate_mem_hole arch_kexec_locate_mem_hole
 100
 101 int load_crashdump_segments_ppc64(struct kimage *image,
 102                                   struct kexec_buf *kbuf);
 103 int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
 104                           const void *fdt, unsigned long kernel_load_addr,
 105                           unsigned long fdt_load_addr);
 106 unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *rmem);
 107 int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, struct crash_mem *rmem);
 108 #endif /* CONFIG_PPC64 */
 109
 110 #endif /* CONFIG_KEXEC_FILE */
 111
 112 #endif /* CONFIG_KEXEC_CORE */
 113
 114 #ifdef CONFIG_CRASH_RESERVE
 115 int __init overlaps_crashkernel(unsigned long start, unsigned long size);
 116 extern void reserve_crashkernel(void);
 117 #else
 118 static inline void reserve_crashkernel(void) {}
 119 static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; }
 120 #endif
 121
 122 #if defined(CONFIG_CRASH_DUMP)
 123 /*
 124  * This function is responsible for capturing register states if coming
 125  * via panic or invoking dump using sysrq-trigger.
 126  */
 127 static inline void crash_setup_regs(struct pt_regs *newregs,
 128                                         struct pt_regs *oldregs)
 129 {
 130         if (oldregs)
 131                 memcpy(newregs, oldregs, sizeof(*newregs));
 132         else
 133                 ppc_save_regs(newregs);
 134 }
 135
 136 #ifdef CONFIG_CRASH_HOTPLUG
 137 void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
 138 #define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
 139
 140 int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
 141 #define arch_crash_hotplug_support arch_crash_hotplug_support
 142
 143 unsigned int arch_crash_get_elfcorehdr_size(void);
 144 #define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
 145 #endif /* CONFIG_CRASH_HOTPLUG */
 146
 147 extern int crashing_cpu;
 148 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
 149 extern void crash_ipi_callback(struct pt_regs *regs);
 150 extern int crash_wake_offline;
 151
 152 extern int crash_shutdown_register(crash_shutdown_t handler);
 153 extern int crash_shutdown_unregister(crash_shutdown_t handler);
 154 extern void default_machine_crash_shutdown(struct pt_regs *regs);
 155
 156 extern void crash_kexec_prepare(void);
 157 extern void crash_kexec_secondary(struct pt_regs *regs);
 158
 159 static inline bool kdump_in_progress(void)
 160 {
 161         return crashing_cpu >= 0;
 162 }
 163
 164 bool is_kdump_kernel(void);
 165 #define is_kdump_kernel                 is_kdump_kernel
 166 #if defined(CONFIG_PPC_RTAS)
 167 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
 168 #define crash_free_reserved_phys_range crash_free_reserved_phys_range
 169 #endif /* CONFIG_PPC_RTAS */
 170
 171 #else /* !CONFIG_CRASH_DUMP */
 172 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 173
 174 static inline int crash_shutdown_register(crash_shutdown_t handler)
 175 {
 176         return 0;
 177 }
 178
 179 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 180 {
 181         return 0;
 182 }
 183
 184 static inline bool kdump_in_progress(void)
 185 {
 186         return false;
 187 }
 188
 189 static inline void crash_ipi_callback(struct pt_regs *regs) { }
 190
 191 static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
 192 {
 193 }
 194
 195 #endif /* CONFIG_CRASH_DUMP */
 196
 197 #if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP)
 198 int update_cpus_node(void *fdt);
 199 #endif
 200
 201 #ifdef CONFIG_PPC_BOOK3S_64
 202 #include <asm/book3s/64/kexec.h>
 203 #endif
 204
 205 #ifndef reset_sprs
 206 #define reset_sprs reset_sprs
 207 static inline void reset_sprs(void)
 208 {
 209 }
 210 #endif
 211
 212 #endif /* ! __ASSEMBLY__ */
 213 #endif /* __KERNEL__ */
 214 #endif /* _ASM_POWERPC_KEXEC_H */