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 __ASSEMBLER__
 53#include <asm/reg.h>
 54
 55typedef void (*crash_shutdown_t)(void);
 56
 57#ifdef CONFIG_KEXEC_CORE
 58struct kimage;
 59struct pt_regs;
 60
 61extern void kexec_smp_wait(void);	/* get and clear naca physid, wait for
 62					  master to copy new code to 0 */
 63extern void default_machine_kexec(struct kimage *image);
 64
 65void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
 66			 unsigned long start_address) __noreturn;
 67void kexec_copy_flush(struct kimage *image);
 68
 69#ifdef CONFIG_KEXEC_FILE
 70extern const struct kexec_file_ops kexec_elf64_ops;
 71
 72#define ARCH_HAS_KIMAGE_ARCH
 73
 74struct kimage_arch {
 75	struct crash_mem *exclude_ranges;
 76
 77	unsigned long backup_start;
 78	void *backup_buf;
 79	void *fdt;
 80};
 81
 82char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 83			  unsigned long cmdline_len);
 84int setup_purgatory(struct kimage *image, const void *slave_code,
 85		    const void *fdt, unsigned long kernel_load_addr,
 86		    unsigned long fdt_load_addr);
 87
 88#ifdef CONFIG_PPC64
 89struct kexec_buf;
 90
 91int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
 92#define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
 93
 94int arch_kimage_file_post_load_cleanup(struct kimage *image);
 95#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
 96
 97int arch_check_excluded_range(struct kimage *image, unsigned long start,
 98			      unsigned long end);
 99#define arch_check_excluded_range  arch_check_excluded_range
100
101
102int load_crashdump_segments_ppc64(struct kimage *image,
103				  struct kexec_buf *kbuf);
104int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
105			  const void *fdt, unsigned long kernel_load_addr,
106			  unsigned long fdt_load_addr);
107unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *rmem);
108int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, struct crash_mem *rmem);
109#endif /* CONFIG_PPC64 */
110
111#endif /* CONFIG_KEXEC_FILE */
112
113#endif /* CONFIG_KEXEC_CORE */
114
115#ifdef CONFIG_CRASH_RESERVE
116int __init overlaps_crashkernel(unsigned long start, unsigned long size);
117extern void arch_reserve_crashkernel(void);
118extern void kdump_cma_reserve(void);
119#else
120static inline void arch_reserve_crashkernel(void) {}
121static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; }
122static inline void kdump_cma_reserve(void) { }
123#endif
124
125#if defined(CONFIG_CRASH_DUMP)
126/*
127 * This function is responsible for capturing register states if coming
128 * via panic or invoking dump using sysrq-trigger.
129 */
130static inline void crash_setup_regs(struct pt_regs *newregs,
131					struct pt_regs *oldregs)
132{
133	if (oldregs)
134		memcpy(newregs, oldregs, sizeof(*newregs));
135	else
136		ppc_save_regs(newregs);
137}
138
139#ifdef CONFIG_CRASH_HOTPLUG
140void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
141#define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
142
143int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
144#define arch_crash_hotplug_support arch_crash_hotplug_support
145
146unsigned int arch_crash_get_elfcorehdr_size(void);
147#define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
148#endif /* CONFIG_CRASH_HOTPLUG */
149
150extern int crashing_cpu;
151extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
152extern void crash_ipi_callback(struct pt_regs *regs);
153extern int crash_wake_offline;
154
155extern int crash_shutdown_register(crash_shutdown_t handler);
156extern int crash_shutdown_unregister(crash_shutdown_t handler);
157extern void default_machine_crash_shutdown(struct pt_regs *regs);
158
159extern void crash_kexec_prepare(void);
160extern void crash_kexec_secondary(struct pt_regs *regs);
161
162static inline bool kdump_in_progress(void)
163{
164	return crashing_cpu >= 0;
165}
166
167bool is_kdump_kernel(void);
168#define is_kdump_kernel			is_kdump_kernel
169#if defined(CONFIG_PPC_RTAS)
170void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
171#define crash_free_reserved_phys_range crash_free_reserved_phys_range
172#endif /* CONFIG_PPC_RTAS */
173
174#else /* !CONFIG_CRASH_DUMP */
175static inline void crash_kexec_secondary(struct pt_regs *regs) { }
176
177static inline int crash_shutdown_register(crash_shutdown_t handler)
178{
179	return 0;
180}
181
182static inline int crash_shutdown_unregister(crash_shutdown_t handler)
183{
184	return 0;
185}
186
187static inline bool kdump_in_progress(void)
188{
189	return false;
190}
191
192static inline void crash_ipi_callback(struct pt_regs *regs) { }
193
194static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
195{
196}
197
198#endif /* CONFIG_CRASH_DUMP */
199
200#if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP)
201int update_cpus_node(void *fdt);
202#endif
203
204#ifdef CONFIG_PPC_BOOK3S_64
205#include <asm/book3s/64/kexec.h>
206#endif
207
208#ifndef reset_sprs
209#define reset_sprs reset_sprs
210static inline void reset_sprs(void)
211{
212}
213#endif
214
215#endif /* ! __ASSEMBLER__ */
216#endif /* __KERNEL__ */
217#endif /* _ASM_POWERPC_KEXEC_H */