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 /* Alignment per CMA requirement. */
23 #define FADUMP_CMA_ALIGNMENT	(PAGE_SIZE <<				\
24 				 max_t(unsigned long, MAX_ORDER - 1,	\
25 				 pageblock_order))
26 
27 /* FAD commands */
28 #define FADUMP_REGISTER			1
29 #define FADUMP_UNREGISTER		2
30 #define FADUMP_INVALIDATE		3
31 
32 /*
33  * Copy the ascii values for first 8 characters from a string into u64
34  * variable at their respective indexes.
35  * e.g.
36  *  The string "FADMPINF" will be converted into 0x4641444d50494e46
37  */
38 static inline u64 fadump_str_to_u64(const char *str)
39 {
40 	u64 val = 0;
41 	int i;
42 
43 	for (i = 0; i < sizeof(val); i++)
44 		val = (*str) ? (val << 8) | *str++ : val << 8;
45 	return val;
46 }
47 
48 #define FADUMP_CPU_UNKNOWN		(~((u32)0))
49 
50 #define FADUMP_CRASH_INFO_MAGIC		fadump_str_to_u64("FADMPINF")
51 
52 /* fadump crash info structure */
53 struct fadump_crash_info_header {
54 	u64		magic_number;
55 	u64		elfcorehdr_addr;
56 	u32		crashing_cpu;
57 	struct pt_regs	regs;
58 	struct cpumask	online_mask;
59 };
60 
61 struct fadump_memory_range {
62 	u64	base;
63 	u64	size;
64 };
65 
66 /* fadump memory ranges info */
67 #define RNG_NAME_SZ			16
68 struct fadump_mrange_info {
69 	char				name[RNG_NAME_SZ];
70 	struct fadump_memory_range	*mem_ranges;
71 	u32				mem_ranges_sz;
72 	u32				mem_range_cnt;
73 	u32				max_mem_ranges;
74 	bool				is_static;
75 };
76 
77 /* Platform specific callback functions */
78 struct fadump_ops;
79 
80 /* Firmware-assisted dump configuration details. */
81 struct fw_dump {
82 	unsigned long	reserve_dump_area_start;
83 	unsigned long	reserve_dump_area_size;
84 	/* cmd line option during boot */
85 	unsigned long	reserve_bootvar;
86 
87 	unsigned long	cpu_state_data_size;
88 	u64		cpu_state_dest_vaddr;
89 	u32		cpu_state_data_version;
90 	u32		cpu_state_entry_size;
91 
92 	unsigned long	hpte_region_size;
93 
94 	unsigned long	boot_memory_size;
95 	u64		boot_mem_dest_addr;
96 	u64		boot_mem_addr[FADUMP_MAX_MEM_REGS];
97 	u64		boot_mem_sz[FADUMP_MAX_MEM_REGS];
98 	u64		boot_mem_top;
99 	u64		boot_mem_regs_cnt;
100 
101 	unsigned long	fadumphdr_addr;
102 	unsigned long	cpu_notes_buf_vaddr;
103 	unsigned long	cpu_notes_buf_size;
104 
105 	/*
106 	 * Maximum size supported by firmware to copy from source to
107 	 * destination address per entry.
108 	 */
109 	u64		max_copy_size;
110 	u64		kernel_metadata;
111 
112 	int		ibm_configure_kernel_dump;
113 
114 	unsigned long	fadump_enabled:1;
115 	unsigned long	fadump_supported:1;
116 	unsigned long	dump_active:1;
117 	unsigned long	dump_registered:1;
118 	unsigned long	nocma:1;
119 
120 	struct fadump_ops	*ops;
121 };
122 
123 struct fadump_ops {
124 	u64	(*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
125 	u64	(*fadump_get_metadata_size)(void);
126 	int	(*fadump_setup_metadata)(struct fw_dump *fadump_conf);
127 	u64	(*fadump_get_bootmem_min)(void);
128 	int	(*fadump_register)(struct fw_dump *fadump_conf);
129 	int	(*fadump_unregister)(struct fw_dump *fadump_conf);
130 	int	(*fadump_invalidate)(struct fw_dump *fadump_conf);
131 	void	(*fadump_cleanup)(struct fw_dump *fadump_conf);
132 	int	(*fadump_process)(struct fw_dump *fadump_conf);
133 	void	(*fadump_region_show)(struct fw_dump *fadump_conf,
134 				      struct seq_file *m);
135 	void	(*fadump_trigger)(struct fadump_crash_info_header *fdh,
136 				  const char *msg);
137 };
138 
139 /* Helper functions */
140 s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus);
141 void fadump_free_cpu_notes_buf(void);
142 u32 *__init fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
143 void __init fadump_update_elfcore_header(char *bufp);
144 bool is_fadump_boot_mem_contiguous(void);
145 bool is_fadump_reserved_mem_contiguous(void);
146 
147 #else /* !CONFIG_PRESERVE_FA_DUMP */
148 
149 /* Firmware-assisted dump configuration details. */
150 struct fw_dump {
151 	u64	boot_mem_top;
152 	u64	dump_active;
153 };
154 
155 #endif /* CONFIG_PRESERVE_FA_DUMP */
156 
157 #ifdef CONFIG_PPC_PSERIES
158 extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
159 #else
160 static inline void
161 rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
162 #endif
163 
164 #ifdef CONFIG_PPC_POWERNV
165 extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
166 #else
167 static inline void
168 opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
169 #endif
170 
171 #endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
172