tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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/* The upper limit percentage for user specified boot memory size (25%) */
47#define MAX_BOOT_MEM_RATIO 4
48
49#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
50
51/* Firmware provided dump sections */
52#define FADUMP_CPU_STATE_DATA 0x0001
53#define FADUMP_HPTE_REGION 0x0002
54#define FADUMP_REAL_MODE_REGION 0x0011
55
56/* Dump request flag */
57#define FADUMP_REQUEST_FLAG 0x00000001
58
59/* FAD commands */
60#define FADUMP_REGISTER 1
61#define FADUMP_UNREGISTER 2
62#define FADUMP_INVALIDATE 3
63
64/* Dump status flag */
65#define FADUMP_ERROR_FLAG 0x2000
66
67#define FADUMP_CPU_ID_MASK ((1UL << 32) - 1)
68
69#define CPU_UNKNOWN (~((u32)0))
70
71/* Utility macros */
72#define SKIP_TO_NEXT_CPU(reg_entry) \
73({ \
74 while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND")) \
75 reg_entry++; \
76 reg_entry++; \
77})
78
79extern int crashing_cpu;
80
81/* Kernel Dump section info */
82struct fadump_section {
83 __be32 request_flag;
84 __be16 source_data_type;
85 __be16 error_flags;
86 __be64 source_address;
87 __be64 source_len;
88 __be64 bytes_dumped;
89 __be64 destination_address;
90};
91
92/* ibm,configure-kernel-dump header. */
93struct fadump_section_header {
94 __be32 dump_format_version;
95 __be16 dump_num_sections;
96 __be16 dump_status_flag;
97 __be32 offset_first_dump_section;
98
99 /* Fields for disk dump option. */
100 __be32 dd_block_size;
101 __be64 dd_block_offset;
102 __be64 dd_num_blocks;
103 __be32 dd_offset_disk_path;
104
105 /* Maximum time allowed to prevent an automatic dump-reboot. */
106 __be32 max_time_auto;
107};
108
109/*
110 * Firmware Assisted dump memory structure. This structure is required for
111 * registering future kernel dump with power firmware through rtas call.
112 *
113 * No disk dump option. Hence disk dump path string section is not included.
114 */
115struct fadump_mem_struct {
116 struct fadump_section_header header;
117
118 /* Kernel dump sections */
119 struct fadump_section cpu_state_data;
120 struct fadump_section hpte_region;
121 struct fadump_section rmr_region;
122};
123
124/* Firmware-assisted dump configuration details. */
125struct fw_dump {
126 unsigned long cpu_state_data_size;
127 unsigned long hpte_region_size;
128 unsigned long boot_memory_size;
129 unsigned long reserve_dump_area_start;
130 unsigned long reserve_dump_area_size;
131 /* cmd line option during boot */
132 unsigned long reserve_bootvar;
133
134 unsigned long fadumphdr_addr;
135 unsigned long cpu_notes_buf;
136 unsigned long cpu_notes_buf_size;
137
138 int ibm_configure_kernel_dump;
139
140 unsigned long fadump_enabled:1;
141 unsigned long fadump_supported:1;
142 unsigned long dump_active:1;
143 unsigned long dump_registered:1;
144};
145
146/*
147 * Copy the ascii values for first 8 characters from a string into u64
148 * variable at their respective indexes.
149 * e.g.
150 * The string "FADMPINF" will be converted into 0x4641444d50494e46
151 */
152static inline u64 str_to_u64(const char *str)
153{
154 u64 val = 0;
155 int i;
156
157 for (i = 0; i < sizeof(val); i++)
158 val = (*str) ? (val << 8) | *str++ : val << 8;
159 return val;
160}
161#define STR_TO_HEX(x) str_to_u64(x)
162#define REG_ID(x) str_to_u64(x)
163
164#define FADUMP_CRASH_INFO_MAGIC STR_TO_HEX("FADMPINF")
165#define REGSAVE_AREA_MAGIC STR_TO_HEX("REGSAVE")
166
167/* The firmware-assisted dump format.
168 *
169 * The register save area is an area in the partition's memory used to preserve
170 * the register contents (CPU state data) for the active CPUs during a firmware
171 * assisted dump. The dump format contains register save area header followed
172 * by register entries. Each list of registers for a CPU starts with
173 * "CPUSTRT" and ends with "CPUEND".
174 */
175
176/* Register save area header. */
177struct fadump_reg_save_area_header {
178 __be64 magic_number;
179 __be32 version;
180 __be32 num_cpu_offset;
181};
182
183/* Register entry. */
184struct fadump_reg_entry {
185 __be64 reg_id;
186 __be64 reg_value;
187};
188
189/* fadump crash info structure */
190struct fadump_crash_info_header {
191 u64 magic_number;
192 u64 elfcorehdr_addr;
193 u32 crashing_cpu;
194 struct pt_regs regs;
195 struct cpumask online_mask;
196};
197
198/* Crash memory ranges */
199#define INIT_CRASHMEM_RANGES (INIT_MEMBLOCK_REGIONS + 2)
200
201struct fad_crash_memory_ranges {
202 unsigned long long base;
203 unsigned long long size;
204};
205
206extern int is_fadump_boot_memory_area(u64 addr, ulong size);
207extern int early_init_dt_scan_fw_dump(unsigned long node,
208 const char *uname, int depth, void *data);
209extern int fadump_reserve_mem(void);
210extern int setup_fadump(void);
211extern int is_fadump_active(void);
212extern int should_fadump_crash(void);
213extern void crash_fadump(struct pt_regs *, const char *);
214extern void fadump_cleanup(void);
215
216#else /* CONFIG_FA_DUMP */
217static inline int is_fadump_active(void) { return 0; }
218static inline int should_fadump_crash(void) { return 0; }
219static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
220#endif
221#endif