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  */
33 static 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 #define FADUMP_CRASH_INFO_MAGIC		fadump_str_to_u64("FADMPINF")
46 
47 /* fadump crash info structure */
48 struct fadump_crash_info_header {
49 	u64		magic_number;
50 	u64		elfcorehdr_addr;
51 	u32		crashing_cpu;
52 	struct pt_regs	regs;
53 	struct cpumask	online_mask;
54 };
55 
56 struct fadump_memory_range {
57 	u64	base;
58 	u64	size;
59 };
60 
61 /* fadump memory ranges info */
62 #define RNG_NAME_SZ			16
63 struct fadump_mrange_info {
64 	char				name[RNG_NAME_SZ];
65 	struct fadump_memory_range	*mem_ranges;
66 	u32				mem_ranges_sz;
67 	u32				mem_range_cnt;
68 	u32				max_mem_ranges;
69 	bool				is_static;
70 };
71 
72 /* Platform specific callback functions */
73 struct fadump_ops;
74 
75 /* Firmware-assisted dump configuration details. */
76 struct fw_dump {
77 	unsigned long	reserve_dump_area_start;
78 	unsigned long	reserve_dump_area_size;
79 	/* cmd line option during boot */
80 	unsigned long	reserve_bootvar;
81 
82 	unsigned long	cpu_state_data_size;
83 	u64		cpu_state_dest_vaddr;
84 	u32		cpu_state_data_version;
85 	u32		cpu_state_entry_size;
86 
87 	unsigned long	hpte_region_size;
88 
89 	unsigned long	boot_memory_size;
90 	u64		boot_mem_dest_addr;
91 	u64		boot_mem_addr[FADUMP_MAX_MEM_REGS];
92 	u64		boot_mem_sz[FADUMP_MAX_MEM_REGS];
93 	u64		boot_mem_top;
94 	u64		boot_mem_regs_cnt;
95 
96 	unsigned long	fadumphdr_addr;
97 	unsigned long	cpu_notes_buf_vaddr;
98 	unsigned long	cpu_notes_buf_size;
99 
100 	/*
101 	 * Maximum size supported by firmware to copy from source to
102 	 * destination address per entry.
103 	 */
104 	u64		max_copy_size;
105 	u64		kernel_metadata;
106 
107 	int		ibm_configure_kernel_dump;
108 
109 	unsigned long	fadump_enabled:1;
110 	unsigned long	fadump_supported:1;
111 	unsigned long	dump_active:1;
112 	unsigned long	dump_registered:1;
113 	unsigned long	nocma:1;
114 
115 	struct fadump_ops	*ops;
116 };
117 
118 struct fadump_ops {
119 	u64	(*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
120 	u64	(*fadump_get_metadata_size)(void);
121 	int	(*fadump_setup_metadata)(struct fw_dump *fadump_conf);
122 	u64	(*fadump_get_bootmem_min)(void);
123 	int	(*fadump_register)(struct fw_dump *fadump_conf);
124 	int	(*fadump_unregister)(struct fw_dump *fadump_conf);
125 	int	(*fadump_invalidate)(struct fw_dump *fadump_conf);
126 	void	(*fadump_cleanup)(struct fw_dump *fadump_conf);
127 	int	(*fadump_process)(struct fw_dump *fadump_conf);
128 	void	(*fadump_region_show)(struct fw_dump *fadump_conf,
129 				      struct seq_file *m);
130 	void	(*fadump_trigger)(struct fadump_crash_info_header *fdh,
131 				  const char *msg);
132 };
133 
134 /* Helper functions */
135 s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus);
136 void fadump_free_cpu_notes_buf(void);
137 u32 *__init fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
138 void __init fadump_update_elfcore_header(char *bufp);
139 bool is_fadump_boot_mem_contiguous(void);
140 bool is_fadump_reserved_mem_contiguous(void);
141 
142 #else /* !CONFIG_PRESERVE_FA_DUMP */
143 
144 /* Firmware-assisted dump configuration details. */
145 struct fw_dump {
146 	u64	boot_mem_top;
147 	u64	dump_active;
148 };
149 
150 #endif /* CONFIG_PRESERVE_FA_DUMP */
151 
152 #ifdef CONFIG_PPC_PSERIES
153 extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
154 #else
155 static inline void
156 rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
157 #endif
158 
159 #ifdef CONFIG_PPC_POWERNV
160 extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
161 #else
162 static inline void
163 opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
164 #endif
165 
166 #endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
167