arch/powerpc/include/asm/kexec.h at master

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kernel / arch / powerpc / include / asm / kexec.h
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  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
 70#if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP)
 71#define ARCH_HAS_KIMAGE_ARCH
 72struct kimage_arch {
 73	struct crash_mem *exclude_ranges;
 74
 75	unsigned long backup_start;
 76	void *backup_buf;
 77	void *fdt;
 78};
 79#endif
 80
 81#ifdef CONFIG_KEXEC_FILE
 82extern const struct kexec_file_ops kexec_elf64_ops;
 83
 84char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 85			  unsigned long cmdline_len);
 86int setup_purgatory(struct kimage *image, const void *slave_code,
 87		    const void *fdt, unsigned long kernel_load_addr,
 88		    unsigned long fdt_load_addr);
 89
 90#ifdef CONFIG_PPC64
 91struct kexec_buf;
 92
 93int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
 94#define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
 95
 96int arch_kimage_file_post_load_cleanup(struct kimage *image);
 97#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
 98
 99int arch_check_excluded_range(struct kimage *image, unsigned long start,
100			      unsigned long end);
101#define arch_check_excluded_range  arch_check_excluded_range
102
103
104int load_crashdump_segments_ppc64(struct kimage *image,
105				  struct kexec_buf *kbuf);
106int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
107			  const void *fdt, unsigned long kernel_load_addr,
108			  unsigned long fdt_load_addr);
109unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *rmem);
110int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, struct crash_mem *rmem);
111#endif /* CONFIG_PPC64 */
112
113#endif /* CONFIG_KEXEC_FILE */
114
115#endif /* CONFIG_KEXEC_CORE */
116
117#ifdef CONFIG_CRASH_RESERVE
118int __init overlaps_crashkernel(unsigned long start, unsigned long size);
119extern void arch_reserve_crashkernel(void);
120extern void kdump_cma_reserve(void);
121#else
122static inline void arch_reserve_crashkernel(void) {}
123static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; }
124static inline void kdump_cma_reserve(void) { }
125#endif
126
127#if defined(CONFIG_CRASH_DUMP)
128/*
129 * This function is responsible for capturing register states if coming
130 * via panic or invoking dump using sysrq-trigger.
131 */
132static inline void crash_setup_regs(struct pt_regs *newregs,
133					struct pt_regs *oldregs)
134{
135	if (oldregs)
136		memcpy(newregs, oldregs, sizeof(*newregs));
137	else
138		ppc_save_regs(newregs);
139}
140
141#ifdef CONFIG_CRASH_HOTPLUG
142void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
143#define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
144
145int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
146#define arch_crash_hotplug_support arch_crash_hotplug_support
147
148unsigned int arch_crash_get_elfcorehdr_size(void);
149#define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
150
151int machine_kexec_post_load(struct kimage *image);
152#define machine_kexec_post_load machine_kexec_post_load
153
154#endif /* CONFIG_CRASH_HOTPLUG */
155
156extern int crashing_cpu;
157extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
158extern void crash_ipi_callback(struct pt_regs *regs);
159extern int crash_wake_offline;
160
161extern int crash_shutdown_register(crash_shutdown_t handler);
162extern int crash_shutdown_unregister(crash_shutdown_t handler);
163extern void default_machine_crash_shutdown(struct pt_regs *regs);
164
165extern void crash_kexec_prepare(void);
166extern void crash_kexec_secondary(struct pt_regs *regs);
167
168extern void sync_backup_region_phdr(struct kimage *image, Elf64_Ehdr *ehdr,
169				    bool phdr_to_kimage);
170static inline bool kdump_in_progress(void)
171{
172	return crashing_cpu >= 0;
173}
174
175bool is_kdump_kernel(void);
176#define is_kdump_kernel			is_kdump_kernel
177#if defined(CONFIG_PPC_RTAS)
178void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
179#define crash_free_reserved_phys_range crash_free_reserved_phys_range
180#endif /* CONFIG_PPC_RTAS */
181
182#else /* !CONFIG_CRASH_DUMP */
183static inline void crash_kexec_secondary(struct pt_regs *regs) { }
184
185static inline int crash_shutdown_register(crash_shutdown_t handler)
186{
187	return 0;
188}
189
190static inline int crash_shutdown_unregister(crash_shutdown_t handler)
191{
192	return 0;
193}
194
195static inline bool kdump_in_progress(void)
196{
197	return false;
198}
199
200static inline void crash_ipi_callback(struct pt_regs *regs) { }
201
202static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
203{
204}
205
206#endif /* CONFIG_CRASH_DUMP */
207
208#if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP)
209int update_cpus_node(void *fdt);
210#endif
211
212#ifdef CONFIG_PPC_BOOK3S_64
213#include <asm/book3s/64/kexec.h>
214#endif
215
216#ifndef reset_sprs
217#define reset_sprs reset_sprs
218static inline void reset_sprs(void)
219{
220}
221#endif
222
223#endif /* ! __ASSEMBLER__ */
224#endif /* __KERNEL__ */
225#endif /* _ASM_POWERPC_KEXEC_H */
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