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1 /*
2 * Firmware Assisted dump header file.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Copyright 2011 IBM Corporation
19 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
20 */
21
22 #ifndef __PPC64_FA_DUMP_H__
23 #define __PPC64_FA_DUMP_H__
24
25 #ifdef CONFIG_FA_DUMP
26
27 /*
28 * The RMA region will be saved for later dumping when kernel crashes.
29 * RMA is Real Mode Area, the first block of logical memory address owned
30 * by logical partition, containing the storage that may be accessed with
31 * translate off.
32 */
33 #define RMA_START 0x0
34 #define RMA_END (ppc64_rma_size)
35
36 /*
37 * On some Power systems where RMO is 128MB, it still requires minimum of
38 * 256MB for kernel to boot successfully. When kdump infrastructure is
39 * configured to save vmcore over network, we run into OOM issue while
40 * loading modules related to network setup. Hence we need aditional 64M
41 * of memory to avoid OOM issue.
42 */
43 #define MIN_BOOT_MEM (((RMA_END < (0x1UL << 28)) ? (0x1UL << 28) : RMA_END) \
44 + (0x1UL << 26))
45
46 #define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
47
48 /* Firmware provided dump sections */
49 #define FADUMP_CPU_STATE_DATA 0x0001
50 #define FADUMP_HPTE_REGION 0x0002
51 #define FADUMP_REAL_MODE_REGION 0x0011
52
53 /* Dump request flag */
54 #define FADUMP_REQUEST_FLAG 0x00000001
55
56 /* FAD commands */
57 #define FADUMP_REGISTER 1
58 #define FADUMP_UNREGISTER 2
59 #define FADUMP_INVALIDATE 3
60
61 /* Dump status flag */
62 #define FADUMP_ERROR_FLAG 0x2000
63
64 #define FADUMP_CPU_ID_MASK ((1UL << 32) - 1)
65
66 #define CPU_UNKNOWN (~((u32)0))
67
68 /* Utility macros */
69 #define SKIP_TO_NEXT_CPU(reg_entry) \
70 ({ \
71 while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND")) \
72 reg_entry++; \
73 reg_entry++; \
74 })
75
76 /* Kernel Dump section info */
77 struct fadump_section {
78 __be32 request_flag;
79 __be16 source_data_type;
80 __be16 error_flags;
81 __be64 source_address;
82 __be64 source_len;
83 __be64 bytes_dumped;
84 __be64 destination_address;
85 };
86
87 /* ibm,configure-kernel-dump header. */
88 struct fadump_section_header {
89 __be32 dump_format_version;
90 __be16 dump_num_sections;
91 __be16 dump_status_flag;
92 __be32 offset_first_dump_section;
93
94 /* Fields for disk dump option. */
95 __be32 dd_block_size;
96 __be64 dd_block_offset;
97 __be64 dd_num_blocks;
98 __be32 dd_offset_disk_path;
99
100 /* Maximum time allowed to prevent an automatic dump-reboot. */
101 __be32 max_time_auto;
102 };
103
104 /*
105 * Firmware Assisted dump memory structure. This structure is required for
106 * registering future kernel dump with power firmware through rtas call.
107 *
108 * No disk dump option. Hence disk dump path string section is not included.
109 */
110 struct fadump_mem_struct {
111 struct fadump_section_header header;
112
113 /* Kernel dump sections */
114 struct fadump_section cpu_state_data;
115 struct fadump_section hpte_region;
116 struct fadump_section rmr_region;
117 };
118
119 /* Firmware-assisted dump configuration details. */
120 struct fw_dump {
121 unsigned long cpu_state_data_size;
122 unsigned long hpte_region_size;
123 unsigned long boot_memory_size;
124 unsigned long reserve_dump_area_start;
125 unsigned long reserve_dump_area_size;
126 /* cmd line option during boot */
127 unsigned long reserve_bootvar;
128
129 unsigned long fadumphdr_addr;
130 unsigned long cpu_notes_buf;
131 unsigned long cpu_notes_buf_size;
132
133 int ibm_configure_kernel_dump;
134
135 unsigned long fadump_enabled:1;
136 unsigned long fadump_supported:1;
137 unsigned long dump_active:1;
138 unsigned long dump_registered:1;
139 };
140
141 /*
142 * Copy the ascii values for first 8 characters from a string into u64
143 * variable at their respective indexes.
144 * e.g.
145 * The string "FADMPINF" will be converted into 0x4641444d50494e46
146 */
147 static inline u64 str_to_u64(const char *str)
148 {
149 u64 val = 0;
150 int i;
151
152 for (i = 0; i < sizeof(val); i++)
153 val = (*str) ? (val << 8) | *str++ : val << 8;
154 return val;
155 }
156 #define STR_TO_HEX(x) str_to_u64(x)
157 #define REG_ID(x) str_to_u64(x)
158
159 #define FADUMP_CRASH_INFO_MAGIC STR_TO_HEX("FADMPINF")
160 #define REGSAVE_AREA_MAGIC STR_TO_HEX("REGSAVE")
161
162 /* The firmware-assisted dump format.
163 *
164 * The register save area is an area in the partition's memory used to preserve
165 * the register contents (CPU state data) for the active CPUs during a firmware
166 * assisted dump. The dump format contains register save area header followed
167 * by register entries. Each list of registers for a CPU starts with
168 * "CPUSTRT" and ends with "CPUEND".
169 */
170
171 /* Register save area header. */
172 struct fadump_reg_save_area_header {
173 __be64 magic_number;
174 __be32 version;
175 __be32 num_cpu_offset;
176 };
177
178 /* Register entry. */
179 struct fadump_reg_entry {
180 __be64 reg_id;
181 __be64 reg_value;
182 };
183
184 /* fadump crash info structure */
185 struct fadump_crash_info_header {
186 u64 magic_number;
187 u64 elfcorehdr_addr;
188 u32 crashing_cpu;
189 struct pt_regs regs;
190 struct cpumask online_mask;
191 };
192
193 /* Crash memory ranges */
194 #define INIT_CRASHMEM_RANGES (INIT_MEMBLOCK_REGIONS + 2)
195
196 struct fad_crash_memory_ranges {
197 unsigned long long base;
198 unsigned long long size;
199 };
200
201 extern int early_init_dt_scan_fw_dump(unsigned long node,
202 const char *uname, int depth, void *data);
203 extern int fadump_reserve_mem(void);
204 extern int setup_fadump(void);
205 extern int is_fadump_active(void);
206 extern void crash_fadump(struct pt_regs *, const char *);
207 extern void fadump_cleanup(void);
208
209 #else /* CONFIG_FA_DUMP */
210 static inline int is_fadump_active(void) { return 0; }
211 static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
212 #endif
213 #endif