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ca01d6dd TL |
1 | /* |
2 | * Persistent Storage - pstore.h | |
3 | * | |
4 | * Copyright (C) 2010 Intel Corporation <tony.luck@intel.com> | |
5 | * | |
6 | * This code is the generic layer to export data records from platform | |
7 | * level persistent storage via a file system. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | #ifndef _LINUX_PSTORE_H | |
23 | #define _LINUX_PSTORE_H | |
24 | ||
5bf6d1b9 MS |
25 | #include <linux/compiler.h> |
26 | #include <linux/errno.h> | |
3d6d8d20 | 27 | #include <linux/kmsg_dump.h> |
67a101f5 | 28 | #include <linux/mutex.h> |
67a101f5 | 29 | #include <linux/spinlock.h> |
5bf6d1b9 MS |
30 | #include <linux/time.h> |
31 | #include <linux/types.h> | |
3d6d8d20 | 32 | |
9abdcccc KC |
33 | struct module; |
34 | ||
0edae0b3 | 35 | /* pstore record types (see fs/pstore/inode.c for filename templates) */ |
ca01d6dd TL |
36 | enum pstore_type_id { |
37 | PSTORE_TYPE_DMESG = 0, | |
38 | PSTORE_TYPE_MCE = 1, | |
f29e5956 | 39 | PSTORE_TYPE_CONSOLE = 2, |
060287b8 | 40 | PSTORE_TYPE_FTRACE = 3, |
69020eea AB |
41 | /* PPC64 partition types */ |
42 | PSTORE_TYPE_PPC_RTAS = 4, | |
f33f748c | 43 | PSTORE_TYPE_PPC_OF = 5, |
a5e4797b | 44 | PSTORE_TYPE_PPC_COMMON = 6, |
9d5438f4 | 45 | PSTORE_TYPE_PMSG = 7, |
ae011d2e | 46 | PSTORE_TYPE_PPC_OPAL = 8, |
ca01d6dd TL |
47 | PSTORE_TYPE_UNKNOWN = 255 |
48 | }; | |
49 | ||
9abdcccc KC |
50 | struct pstore_info; |
51 | /** | |
52 | * struct pstore_record - details of a pstore record entry | |
53 | * @psi: pstore backend driver information | |
54 | * @type: pstore record type | |
55 | * @id: per-type unique identifier for record | |
56 | * @time: timestamp of the record | |
57 | * @count: for PSTORE_TYPE_DMESG, the Oops count. | |
58 | * @compressed: for PSTORE_TYPE_DMESG, whether the buffer is compressed | |
59 | * @buf: pointer to record contents | |
60 | * @size: size of @buf | |
61 | * @ecc_notice_size: | |
62 | * ECC information for @buf | |
63 | */ | |
64 | struct pstore_record { | |
65 | struct pstore_info *psi; | |
66 | enum pstore_type_id type; | |
67 | u64 id; | |
68 | struct timespec time; | |
69 | int count; | |
70 | bool compressed; | |
71 | char *buf; | |
72 | ssize_t size; | |
73 | ssize_t ecc_notice_size; | |
74 | }; | |
67a101f5 | 75 | |
0edae0b3 KC |
76 | /** |
77 | * struct pstore_info - backend pstore driver structure | |
78 | * | |
79 | * @owner: module which is repsonsible for this backend driver | |
80 | * @name: name of the backend driver | |
81 | * | |
82 | * @buf_lock: spinlock to serialize access to @buf | |
83 | * @buf: preallocated crash dump buffer | |
84 | * @bufsize: size of @buf available for crash dump writes | |
85 | * | |
86 | * @read_mutex: serializes @open, @read, @close, and @erase callbacks | |
87 | * @flags: bitfield of frontends the backend can accept writes for | |
88 | * @data: backend-private pointer passed back during callbacks | |
89 | * | |
90 | * Callbacks: | |
91 | * | |
92 | * @open: | |
93 | * Notify backend that pstore is starting a full read of backend | |
94 | * records. Followed by one or more @read calls, and a final @close. | |
95 | * | |
96 | * @psi: in: pointer to the struct pstore_info for the backend | |
97 | * | |
98 | * Returns 0 on success, and non-zero on error. | |
99 | * | |
100 | * @close: | |
101 | * Notify backend that pstore has finished a full read of backend | |
102 | * records. Always preceded by an @open call and one or more @read | |
103 | * calls. | |
104 | * | |
105 | * @psi: in: pointer to the struct pstore_info for the backend | |
106 | * | |
107 | * Returns 0 on success, and non-zero on error. (Though pstore will | |
108 | * ignore the error.) | |
109 | * | |
110 | * @read: | |
111 | * Read next available backend record. Called after a successful | |
112 | * @open. | |
113 | * | |
125cc42b KC |
114 | * @record: |
115 | * pointer to record to populate. @buf should be allocated | |
116 | * by the backend and filled. At least @type and @id should | |
117 | * be populated, since these are used when creating pstorefs | |
118 | * file names. | |
0edae0b3 KC |
119 | * |
120 | * Returns record size on success, zero when no more records are | |
121 | * available, or negative on error. | |
122 | * | |
123 | * @write: | |
124 | * Perform a frontend notification of a write to a backend record. The | |
125 | * data to be stored has already been written to the registered @buf | |
126 | * of the @psi structure. | |
127 | * | |
128 | * @type: in: pstore record type to write | |
129 | * @reason: | |
130 | * in: pstore write reason | |
131 | * @id: out: unique identifier for the record | |
132 | * @part: in: position in a multipart write | |
133 | * @count: in: increasing from 0 since boot, the number of this Oops | |
134 | * @compressed: | |
135 | * in: if the record is compressed | |
136 | * @size: in: size of the write | |
137 | * @psi: in: pointer to the struct pstore_info for the backend | |
138 | * | |
139 | * Returns 0 on success, and non-zero on error. | |
140 | * | |
141 | * @write_buf: | |
142 | * Perform a frontend write to a backend record, using a specified | |
143 | * buffer. Unlike @write, this does not use the @psi @buf. | |
144 | * | |
145 | * @type: in: pstore record type to write | |
146 | * @reason: | |
147 | * in: pstore write reason | |
148 | * @id: out: unique identifier for the record | |
149 | * @part: in: position in a multipart write | |
150 | * @buf: in: pointer to contents to write to backend record | |
151 | * @compressed: | |
152 | * in: if the record is compressed | |
153 | * @size: in: size of the write | |
154 | * @psi: in: pointer to the struct pstore_info for the backend | |
155 | * | |
156 | * Returns 0 on success, and non-zero on error. | |
157 | * | |
158 | * @write_buf_user: | |
159 | * Perform a frontend write to a backend record, using a specified | |
160 | * buffer that is coming directly from userspace. | |
161 | * | |
162 | * @type: in: pstore record type to write | |
163 | * @reason: | |
164 | * in: pstore write reason | |
165 | * @id: out: unique identifier for the record | |
166 | * @part: in: position in a multipart write | |
167 | * @buf: in: pointer to userspace contents to write to backend record | |
168 | * @compressed: | |
169 | * in: if the record is compressed | |
170 | * @size: in: size of the write | |
171 | * @psi: in: pointer to the struct pstore_info for the backend | |
172 | * | |
173 | * Returns 0 on success, and non-zero on error. | |
174 | * | |
175 | * @erase: | |
176 | * Delete a record from backend storage. Different backends | |
177 | * identify records differently, so all possible methods of | |
178 | * identification are included to help the backend locate the | |
179 | * record to remove. | |
180 | * | |
181 | * @type: in: pstore record type to write | |
182 | * @id: in: per-type unique identifier for the record | |
183 | * @count: in: Oops count | |
184 | * @time: in: timestamp for the record | |
185 | * @psi: in: pointer to the struct pstore_info for the backend | |
186 | * | |
187 | * Returns 0 on success, and non-zero on error. | |
188 | * | |
189 | */ | |
ca01d6dd TL |
190 | struct pstore_info { |
191 | struct module *owner; | |
192 | char *name; | |
0edae0b3 KC |
193 | |
194 | spinlock_t buf_lock; | |
ca01d6dd TL |
195 | char *buf; |
196 | size_t bufsize; | |
0edae0b3 KC |
197 | |
198 | struct mutex read_mutex; | |
199 | ||
df36ac1b | 200 | int flags; |
0edae0b3 KC |
201 | void *data; |
202 | ||
06cf91b4 CG |
203 | int (*open)(struct pstore_info *psi); |
204 | int (*close)(struct pstore_info *psi); | |
125cc42b | 205 | ssize_t (*read)(struct pstore_record *record); |
3d6d8d20 KC |
206 | int (*write)(enum pstore_type_id type, |
207 | enum kmsg_dump_reason reason, u64 *id, | |
b3b515bb | 208 | unsigned int part, int count, bool compressed, |
6bbbca73 | 209 | size_t size, struct pstore_info *psi); |
897dba02 AV |
210 | int (*write_buf)(enum pstore_type_id type, |
211 | enum kmsg_dump_reason reason, u64 *id, | |
b3b515bb | 212 | unsigned int part, const char *buf, bool compressed, |
6bbbca73 | 213 | size_t size, struct pstore_info *psi); |
5bf6d1b9 MS |
214 | int (*write_buf_user)(enum pstore_type_id type, |
215 | enum kmsg_dump_reason reason, u64 *id, | |
216 | unsigned int part, const char __user *buf, | |
217 | bool compressed, size_t size, struct pstore_info *psi); | |
56280682 | 218 | int (*erase)(enum pstore_type_id type, u64 id, |
755d4fe4 SA |
219 | int count, struct timespec time, |
220 | struct pstore_info *psi); | |
ca01d6dd TL |
221 | }; |
222 | ||
0edae0b3 | 223 | /* Supported frontends */ |
c950fd6f | 224 | #define PSTORE_FLAGS_DMESG (1 << 0) |
c950fd6f NK |
225 | #define PSTORE_FLAGS_CONSOLE (1 << 1) |
226 | #define PSTORE_FLAGS_FTRACE (1 << 2) | |
227 | #define PSTORE_FLAGS_PMSG (1 << 3) | |
228 | ||
ca01d6dd | 229 | extern int pstore_register(struct pstore_info *); |
ee1d2674 | 230 | extern void pstore_unregister(struct pstore_info *); |
9f244e9c | 231 | extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason); |
ca01d6dd | 232 | |
fbccdeb8 JF |
233 | struct pstore_ftrace_record { |
234 | unsigned long ip; | |
235 | unsigned long parent_ip; | |
236 | u64 ts; | |
237 | }; | |
238 | ||
239 | /* | |
240 | * ftrace related stuff: Both backends and frontends need these so expose | |
241 | * them here. | |
242 | */ | |
243 | ||
244 | #if NR_CPUS <= 2 && defined(CONFIG_ARM_THUMB) | |
245 | #define PSTORE_CPU_IN_IP 0x1 | |
246 | #elif NR_CPUS <= 4 && defined(CONFIG_ARM) | |
247 | #define PSTORE_CPU_IN_IP 0x3 | |
248 | #endif | |
249 | ||
250 | #define TS_CPU_SHIFT 8 | |
251 | #define TS_CPU_MASK (BIT(TS_CPU_SHIFT) - 1) | |
252 | ||
253 | /* | |
254 | * If CPU number can be stored in IP, store it there, otherwise store it in | |
255 | * the time stamp. This means more timestamp resolution is available when | |
256 | * the CPU can be stored in the IP. | |
257 | */ | |
258 | #ifdef PSTORE_CPU_IN_IP | |
259 | static inline void | |
260 | pstore_ftrace_encode_cpu(struct pstore_ftrace_record *rec, unsigned int cpu) | |
261 | { | |
262 | rec->ip |= cpu; | |
263 | } | |
264 | ||
265 | static inline unsigned int | |
266 | pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec) | |
267 | { | |
268 | return rec->ip & PSTORE_CPU_IN_IP; | |
269 | } | |
270 | ||
271 | static inline u64 | |
272 | pstore_ftrace_read_timestamp(struct pstore_ftrace_record *rec) | |
273 | { | |
274 | return rec->ts; | |
275 | } | |
276 | ||
277 | static inline void | |
278 | pstore_ftrace_write_timestamp(struct pstore_ftrace_record *rec, u64 val) | |
279 | { | |
280 | rec->ts = val; | |
281 | } | |
282 | #else | |
283 | static inline void | |
284 | pstore_ftrace_encode_cpu(struct pstore_ftrace_record *rec, unsigned int cpu) | |
285 | { | |
286 | rec->ts &= ~(TS_CPU_MASK); | |
287 | rec->ts |= cpu; | |
288 | } | |
289 | ||
290 | static inline unsigned int | |
291 | pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec) | |
292 | { | |
293 | return rec->ts & TS_CPU_MASK; | |
294 | } | |
295 | ||
296 | static inline u64 | |
297 | pstore_ftrace_read_timestamp(struct pstore_ftrace_record *rec) | |
298 | { | |
299 | return rec->ts >> TS_CPU_SHIFT; | |
300 | } | |
301 | ||
302 | static inline void | |
303 | pstore_ftrace_write_timestamp(struct pstore_ftrace_record *rec, u64 val) | |
304 | { | |
305 | rec->ts = (rec->ts & TS_CPU_MASK) | (val << TS_CPU_SHIFT); | |
306 | } | |
307 | #endif | |
308 | ||
ca01d6dd | 309 | #endif /*_LINUX_PSTORE_H*/ |