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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Firmware-Assisted Dump internal code.
4 *
5 * Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
6 * Copyright 2019, Hari Bathini, IBM Corporation.
7 */
8
9#ifndef _ASM_POWERPC_FADUMP_INTERNAL_H
10#define _ASM_POWERPC_FADUMP_INTERNAL_H
11
12/* Maximum number of memory regions kernel supports */
13#define FADUMP_MAX_MEM_REGS 128
14
15#ifndef CONFIG_PRESERVE_FA_DUMP
16
17/* The upper limit percentage for user specified boot memory size (25%) */
18#define MAX_BOOT_MEM_RATIO 4
19
20#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
21
22/* FAD commands */
23#define FADUMP_REGISTER 1
24#define FADUMP_UNREGISTER 2
25#define FADUMP_INVALIDATE 3
26
27/*
28 * Copy the ascii values for first 8 characters from a string into u64
29 * variable at their respective indexes.
30 * e.g.
31 * The string "FADMPINF" will be converted into 0x4641444d50494e46
32 */
33static inline u64 fadump_str_to_u64(const char *str)
34{
35 u64 val = 0;
36 int i;
37
38 for (i = 0; i < sizeof(val); i++)
39 val = (*str) ? (val << 8) | *str++ : val << 8;
40 return val;
41}
42
43#define FADUMP_CPU_UNKNOWN (~((u32)0))
44
45/*
46 * The introduction of new fields in the fadump crash info header has
47 * led to a change in the magic key from `FADMPINF` to `FADMPSIG` for
48 * identifying a kernel crash from an old kernel.
49 *
50 * To prevent the need for further changes to the magic number in the
51 * event of future modifications to the fadump crash info header, a
52 * version field has been introduced to track the fadump crash info
53 * header version.
54 *
55 * Consider a few points before adding new members to the fadump crash info
56 * header structure:
57 *
58 * - Append new members; avoid adding them in between.
59 * - Non-primitive members should have a size member as well.
60 * - For every change in the fadump header, increment the
61 * fadump header version. This helps the updated kernel decide how to
62 * handle kernel dumps from older kernels.
63 */
64#define FADUMP_CRASH_INFO_MAGIC_OLD fadump_str_to_u64("FADMPINF")
65#define FADUMP_CRASH_INFO_MAGIC fadump_str_to_u64("FADMPSIG")
66#define FADUMP_HEADER_VERSION 1
67
68/* fadump crash info structure */
69struct fadump_crash_info_header {
70 u64 magic_number;
71 u32 version;
72 u32 crashing_cpu;
73 u64 vmcoreinfo_raddr;
74 u64 vmcoreinfo_size;
75 u32 pt_regs_sz;
76 u32 cpu_mask_sz;
77 struct pt_regs regs;
78 struct cpumask cpu_mask;
79};
80
81struct fadump_memory_range {
82 u64 base;
83 u64 size;
84};
85
86/* fadump memory ranges info */
87#define RNG_NAME_SZ 16
88struct fadump_mrange_info {
89 char name[RNG_NAME_SZ];
90 struct fadump_memory_range *mem_ranges;
91 u32 mem_ranges_sz;
92 u32 mem_range_cnt;
93 u32 max_mem_ranges;
94 bool is_static;
95};
96
97/* Platform specific callback functions */
98struct fadump_ops;
99
100/* Firmware-assisted dump configuration details. */
101struct fw_dump {
102 unsigned long reserve_dump_area_start;
103 unsigned long reserve_dump_area_size;
104 /* cmd line option during boot */
105 unsigned long reserve_bootvar;
106
107 unsigned long cpu_state_data_size;
108 u64 cpu_state_dest_vaddr;
109 u32 cpu_state_data_version;
110 u32 cpu_state_entry_size;
111
112 unsigned long hpte_region_size;
113
114 unsigned long boot_memory_size;
115 u64 boot_mem_dest_addr;
116 u64 boot_mem_addr[FADUMP_MAX_MEM_REGS];
117 u64 boot_mem_sz[FADUMP_MAX_MEM_REGS];
118 u64 boot_mem_top;
119 u64 boot_mem_regs_cnt;
120
121 unsigned long fadumphdr_addr;
122 u64 elfcorehdr_addr;
123 u64 elfcorehdr_size;
124 unsigned long cpu_notes_buf_vaddr;
125 unsigned long cpu_notes_buf_size;
126
127 unsigned long param_area;
128
129 /*
130 * Maximum size supported by firmware to copy from source to
131 * destination address per entry.
132 */
133 u64 max_copy_size;
134 u64 kernel_metadata;
135
136 int ibm_configure_kernel_dump;
137
138 unsigned long fadump_enabled:1;
139 unsigned long fadump_supported:1;
140 unsigned long dump_active:1;
141 unsigned long dump_registered:1;
142 unsigned long nocma:1;
143 unsigned long param_area_supported:1;
144
145 struct fadump_ops *ops;
146};
147
148struct fadump_ops {
149 u64 (*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
150 u64 (*fadump_get_metadata_size)(void);
151 int (*fadump_setup_metadata)(struct fw_dump *fadump_conf);
152 u64 (*fadump_get_bootmem_min)(void);
153 int (*fadump_register)(struct fw_dump *fadump_conf);
154 int (*fadump_unregister)(struct fw_dump *fadump_conf);
155 int (*fadump_invalidate)(struct fw_dump *fadump_conf);
156 void (*fadump_cleanup)(struct fw_dump *fadump_conf);
157 int (*fadump_process)(struct fw_dump *fadump_conf);
158 void (*fadump_region_show)(struct fw_dump *fadump_conf,
159 struct seq_file *m);
160 void (*fadump_trigger)(struct fadump_crash_info_header *fdh,
161 const char *msg);
162 int (*fadump_max_boot_mem_rgns)(void);
163};
164
165/* Helper functions */
166s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus);
167void fadump_free_cpu_notes_buf(void);
168u32 *__init fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
169void __init fadump_update_elfcore_header(char *bufp);
170bool is_fadump_reserved_mem_contiguous(void);
171
172#else /* !CONFIG_PRESERVE_FA_DUMP */
173
174/* Firmware-assisted dump configuration details. */
175struct fw_dump {
176 u64 boot_mem_top;
177 u64 dump_active;
178};
179
180#endif /* CONFIG_PRESERVE_FA_DUMP */
181
182#ifdef CONFIG_PPC_PSERIES
183extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
184#else
185static inline void
186rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
187#endif
188
189#ifdef CONFIG_PPC_POWERNV
190extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
191#else
192static inline void
193opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
194#endif
195
196#endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
197

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source code of linux/arch/powerpc/include/asm/fadump-internal.h