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56d611a0 MS |
1 | /* |
2 | * RAM Oops/Panic logger | |
3 | * | |
4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
9ba80d99 | 5 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> |
56d611a0 MS |
6 | * |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
0169256e MS |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
56d611a0 | 25 | #include <linux/kernel.h> |
83c1b317 | 26 | #include <linux/err.h> |
56d611a0 | 27 | #include <linux/module.h> |
cbe7cbf5 | 28 | #include <linux/version.h> |
9ba80d99 | 29 | #include <linux/pstore.h> |
56d611a0 MS |
30 | #include <linux/io.h> |
31 | #include <linux/ioport.h> | |
c3b92ce9 | 32 | #include <linux/platform_device.h> |
13aefd72 | 33 | #include <linux/slab.h> |
24203036 | 34 | #include <linux/compiler.h> |
1894a253 | 35 | #include <linux/pstore_ram.h> |
35da6094 GH |
36 | #include <linux/of.h> |
37 | #include <linux/of_address.h> | |
56d611a0 MS |
38 | |
39 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 40 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 41 | |
3e5c4fad SI |
42 | static ulong record_size = MIN_MEM_SIZE; |
43 | module_param(record_size, ulong, 0400); | |
44 | MODULE_PARM_DESC(record_size, | |
45 | "size of each dump done on oops/panic"); | |
56d611a0 | 46 | |
b5d38e9b AV |
47 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
48 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
49 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
50 | ||
a694d1b5 AV |
51 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
52 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
53 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
54 | ||
9d5438f4 MS |
55 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
56 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
57 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
58 | ||
764fd639 | 59 | static unsigned long long mem_address; |
b90fe0c4 | 60 | module_param_hw(mem_address, ullong, other, 0400); |
56d611a0 MS |
61 | MODULE_PARM_DESC(mem_address, |
62 | "start of reserved RAM used to store oops/panic logs"); | |
63 | ||
64 | static ulong mem_size; | |
65 | module_param(mem_size, ulong, 0400); | |
66 | MODULE_PARM_DESC(mem_size, | |
67 | "size of reserved RAM used to store oops/panic logs"); | |
68 | ||
027bc8b0 TL |
69 | static unsigned int mem_type; |
70 | module_param(mem_type, uint, 0600); | |
71 | MODULE_PARM_DESC(mem_type, | |
72 | "set to 1 to try to use unbuffered memory (default 0)"); | |
73 | ||
56d611a0 MS |
74 | static int dump_oops = 1; |
75 | module_param(dump_oops, int, 0600); | |
76 | MODULE_PARM_DESC(dump_oops, | |
77 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
78 | ||
39eb7e97 AV |
79 | static int ramoops_ecc; |
80 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
81 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
82 | "if non-zero, the option enables ECC support and specifies " |
83 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
84 | "bytes ECC)"); | |
39eb7e97 | 85 | |
9ba80d99 | 86 | struct ramoops_context { |
a5d23b95 KC |
87 | struct persistent_ram_zone **dprzs; /* Oops dump zones */ |
88 | struct persistent_ram_zone *cprz; /* Console zone */ | |
89 | struct persistent_ram_zone **fprzs; /* Ftrace zones */ | |
90 | struct persistent_ram_zone *mprz; /* PMSG zone */ | |
56d611a0 MS |
91 | phys_addr_t phys_addr; |
92 | unsigned long size; | |
027bc8b0 | 93 | unsigned int memtype; |
9ba80d99 | 94 | size_t record_size; |
b5d38e9b | 95 | size_t console_size; |
a694d1b5 | 96 | size_t ftrace_size; |
9d5438f4 | 97 | size_t pmsg_size; |
6b4d2a27 | 98 | int dump_oops; |
a1cf53ac | 99 | u32 flags; |
c31ad081 | 100 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
101 | unsigned int max_dump_cnt; |
102 | unsigned int dump_write_cnt; | |
57fd8353 | 103 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 104 | unsigned int dump_read_cnt; |
b5d38e9b | 105 | unsigned int console_read_cnt; |
a1cf53ac | 106 | unsigned int max_ftrace_cnt; |
a694d1b5 | 107 | unsigned int ftrace_read_cnt; |
9d5438f4 | 108 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
109 | struct pstore_info pstore; |
110 | }; | |
56d611a0 | 111 | |
13aefd72 | 112 | static struct platform_device *dummy; |
13aefd72 | 113 | |
9ba80d99 KC |
114 | static int ramoops_pstore_open(struct pstore_info *psi) |
115 | { | |
116 | struct ramoops_context *cxt = psi->data; | |
117 | ||
cac2eb7b | 118 | cxt->dump_read_cnt = 0; |
b5d38e9b | 119 | cxt->console_read_cnt = 0; |
57fd8353 | 120 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 121 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
122 | return 0; |
123 | } | |
124 | ||
755d66b4 | 125 | static struct persistent_ram_zone * |
b05c9506 JFG |
126 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id, |
127 | struct pstore_record *record) | |
755d66b4 AV |
128 | { |
129 | struct persistent_ram_zone *prz; | |
755d66b4 | 130 | |
46418413 | 131 | /* Give up if we never existed or have hit the end. */ |
b05c9506 | 132 | if (!przs) |
755d66b4 AV |
133 | return NULL; |
134 | ||
b05c9506 | 135 | prz = przs[id]; |
b0aa931f LS |
136 | if (!prz) |
137 | return NULL; | |
755d66b4 | 138 | |
aa9a4a1e | 139 | /* Update old/shadowed buffer. */ |
6a4c9ab1 | 140 | if (prz->type == PSTORE_TYPE_DMESG) |
755d66b4 | 141 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
142 | |
143 | if (!persistent_ram_old_size(prz)) | |
144 | return NULL; | |
755d66b4 | 145 | |
b05c9506 JFG |
146 | record->type = prz->type; |
147 | record->id = id; | |
755d66b4 AV |
148 | |
149 | return prz; | |
150 | } | |
151 | ||
7aaa822e | 152 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time, |
3f8f80f0 AB |
153 | bool *compressed) |
154 | { | |
155 | char data_type; | |
a28726b4 | 156 | int header_length = 0; |
3f8f80f0 | 157 | |
e264abea AB |
158 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n", |
159 | (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type, | |
7aaa822e | 160 | &header_length) == 3) { |
3f8f80f0 AB |
161 | if (data_type == 'C') |
162 | *compressed = true; | |
163 | else | |
164 | *compressed = false; | |
e264abea AB |
165 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n", |
166 | (time64_t *)&time->tv_sec, &time->tv_nsec, | |
7aaa822e KC |
167 | &header_length) == 2) { |
168 | *compressed = false; | |
3f8f80f0 AB |
169 | } else { |
170 | time->tv_sec = 0; | |
171 | time->tv_nsec = 0; | |
172 | *compressed = false; | |
173 | } | |
a28726b4 | 174 | return header_length; |
3f8f80f0 AB |
175 | } |
176 | ||
f44f9652 MS |
177 | static bool prz_ok(struct persistent_ram_zone *prz) |
178 | { | |
179 | return !!prz && !!(persistent_ram_old_size(prz) + | |
180 | persistent_ram_ecc_string(prz, NULL, 0)); | |
181 | } | |
182 | ||
2fbea82b JF |
183 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
184 | struct persistent_ram_zone *src) | |
185 | { | |
186 | size_t dest_size, src_size, total, dest_off, src_off; | |
187 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
188 | void *merged_buf; | |
189 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
190 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
191 | ||
192 | dest_off = dest->old_log_size % record_size; | |
193 | dest_size = dest->old_log_size - dest_off; | |
194 | ||
195 | src_off = src->old_log_size % record_size; | |
196 | src_size = src->old_log_size - src_off; | |
197 | ||
198 | total = dest_size + src_size; | |
199 | merged_buf = kmalloc(total, GFP_KERNEL); | |
200 | if (!merged_buf) | |
201 | return -ENOMEM; | |
202 | ||
203 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
204 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
205 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
206 | ||
207 | while (dest_size > 0 && src_size > 0) { | |
208 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
209 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
210 | mrec[merged_idx++] = drec[dest_idx++]; | |
211 | dest_size -= record_size; | |
212 | } else { | |
213 | mrec[merged_idx++] = srec[src_idx++]; | |
214 | src_size -= record_size; | |
215 | } | |
216 | } | |
217 | ||
218 | while (dest_size > 0) { | |
219 | mrec[merged_idx++] = drec[dest_idx++]; | |
220 | dest_size -= record_size; | |
221 | } | |
222 | ||
223 | while (src_size > 0) { | |
224 | mrec[merged_idx++] = srec[src_idx++]; | |
225 | src_size -= record_size; | |
226 | } | |
227 | ||
228 | kfree(dest->old_log); | |
229 | dest->old_log = merged_buf; | |
230 | dest->old_log_size = total; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
125cc42b | 235 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 236 | { |
2fbea82b | 237 | ssize_t size = 0; |
125cc42b | 238 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
239 | struct persistent_ram_zone *prz = NULL; |
240 | int header_length = 0; | |
2fbea82b | 241 | bool free_prz = false; |
e036bd33 | 242 | |
125cc42b KC |
243 | /* |
244 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
245 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
246 | * valid time stamps, so it is initialized to zero. | |
247 | */ | |
125cc42b KC |
248 | record->time.tv_sec = 0; |
249 | record->time.tv_nsec = 0; | |
250 | record->compressed = false; | |
e036bd33 BZ |
251 | |
252 | /* Find the next valid persistent_ram_zone for DMESG */ | |
253 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
b05c9506 JFG |
254 | prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++, |
255 | record); | |
e036bd33 BZ |
256 | if (!prz_ok(prz)) |
257 | continue; | |
258 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
259 | &record->time, |
260 | &record->compressed); | |
e036bd33 BZ |
261 | /* Clear and skip this DMESG record if it has no valid header */ |
262 | if (!header_length) { | |
263 | persistent_ram_free_old(prz); | |
264 | persistent_ram_zap(prz); | |
265 | prz = NULL; | |
266 | } | |
267 | } | |
9ba80d99 | 268 | |
b05c9506 JFG |
269 | if (!prz_ok(prz) && !cxt->console_read_cnt++) |
270 | prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record); | |
2fbea82b | 271 | |
b05c9506 JFG |
272 | if (!prz_ok(prz) && !cxt->pmsg_read_cnt++) |
273 | prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record); | |
2fbea82b JF |
274 | |
275 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 276 | if (!prz_ok(prz)) { |
b05c9506 JFG |
277 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) && |
278 | !cxt->ftrace_read_cnt++) { | |
279 | prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */, | |
280 | record); | |
2fbea82b JF |
281 | } else { |
282 | /* | |
283 | * Build a new dummy record which combines all the | |
284 | * per-cpu records including metadata and ecc info. | |
285 | */ | |
286 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
287 | ||
288 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
289 | GFP_KERNEL); | |
290 | if (!tmp_prz) | |
291 | return -ENOMEM; | |
8665569e | 292 | prz = tmp_prz; |
2fbea82b JF |
293 | free_prz = true; |
294 | ||
295 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
296 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
b05c9506 | 297 | cxt->ftrace_read_cnt++, record); |
2fbea82b JF |
298 | |
299 | if (!prz_ok(prz_next)) | |
300 | continue; | |
301 | ||
302 | tmp_prz->ecc_info = prz_next->ecc_info; | |
303 | tmp_prz->corrected_bytes += | |
304 | prz_next->corrected_bytes; | |
305 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
306 | size = ftrace_log_combine(tmp_prz, prz_next); | |
307 | if (size) | |
308 | goto out; | |
309 | } | |
125cc42b | 310 | record->id = 0; |
a1cf53ac JF |
311 | } |
312 | } | |
313 | ||
2fbea82b JF |
314 | if (!prz_ok(prz)) { |
315 | size = 0; | |
316 | goto out; | |
317 | } | |
896fc1f0 | 318 | |
e036bd33 | 319 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
320 | |
321 | /* ECC correction notice */ | |
125cc42b | 322 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 323 | |
125cc42b KC |
324 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
325 | if (record->buf == NULL) { | |
2fbea82b JF |
326 | size = -ENOMEM; |
327 | goto out; | |
328 | } | |
9ba80d99 | 329 | |
125cc42b KC |
330 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
331 | size); | |
2fbea82b | 332 | |
125cc42b KC |
333 | persistent_ram_ecc_string(prz, record->buf + size, |
334 | record->ecc_notice_size + 1); | |
bd08ec33 | 335 | |
2fbea82b JF |
336 | out: |
337 | if (free_prz) { | |
338 | kfree(prz->old_log); | |
339 | kfree(prz); | |
340 | } | |
341 | ||
8cfc8ddc | 342 | return size; |
9ba80d99 KC |
343 | } |
344 | ||
3f8f80f0 | 345 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
c7f3c595 | 346 | struct pstore_record *record) |
896fc1f0 | 347 | { |
93ee4b7d | 348 | char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */ |
896fc1f0 AV |
349 | size_t len; |
350 | ||
93ee4b7d KC |
351 | len = scnprintf(hdr, sizeof(hdr), |
352 | RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n", | |
e264abea | 353 | (time64_t)record->time.tv_sec, |
c7f3c595 KC |
354 | record->time.tv_nsec / 1000, |
355 | record->compressed ? 'C' : 'D'); | |
896fc1f0 | 356 | persistent_ram_write(prz, hdr, len); |
896fc1f0 AV |
357 | |
358 | return len; | |
359 | } | |
360 | ||
4c9ec219 | 361 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 362 | { |
b10b4711 | 363 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 364 | struct persistent_ram_zone *prz; |
b10b4711 | 365 | size_t size, hlen; |
9ba80d99 | 366 | |
b10b4711 | 367 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
368 | if (!cxt->cprz) |
369 | return -ENOMEM; | |
b10b4711 | 370 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 371 | return 0; |
b10b4711 | 372 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
373 | int zonenum; |
374 | ||
375 | if (!cxt->fprzs) | |
a694d1b5 | 376 | return -ENOMEM; |
a1cf53ac JF |
377 | /* |
378 | * Choose zone by if we're using per-cpu buffers. | |
379 | */ | |
380 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
381 | zonenum = smp_processor_id(); | |
382 | else | |
383 | zonenum = 0; | |
384 | ||
b10b4711 KC |
385 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
386 | record->size); | |
a694d1b5 | 387 | return 0; |
b10b4711 | 388 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
389 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
390 | return -EINVAL; | |
b5d38e9b AV |
391 | } |
392 | ||
b10b4711 | 393 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 394 | return -EINVAL; |
56d611a0 | 395 | |
b10b4711 KC |
396 | /* |
397 | * Out of the various dmesg dump types, ramoops is currently designed | |
9ba80d99 KC |
398 | * to only store crash logs, rather than storing general kernel logs. |
399 | */ | |
b10b4711 KC |
400 | if (record->reason != KMSG_DUMP_OOPS && |
401 | record->reason != KMSG_DUMP_PANIC) | |
9ba80d99 | 402 | return -EINVAL; |
fc2d557c | 403 | |
9ba80d99 | 404 | /* Skip Oopes when configured to do so. */ |
b10b4711 | 405 | if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
406 | return -EINVAL; |
407 | ||
b10b4711 KC |
408 | /* |
409 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
410 | * If our buffer is larger than kmsg_bytes, this can never happen, |
411 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
412 | * report split across multiple records. | |
413 | */ | |
b10b4711 | 414 | if (record->part != 1) |
9ba80d99 | 415 | return -ENOSPC; |
56d611a0 | 416 | |
a5d23b95 | 417 | if (!cxt->dprzs) |
c6289378 AH |
418 | return -ENOSPC; |
419 | ||
a5d23b95 | 420 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 421 | |
b10b4711 | 422 | /* Build header and append record contents. */ |
c7f3c595 | 423 | hlen = ramoops_write_kmsg_hdr(prz, record); |
47afd7ae YH |
424 | if (!hlen) |
425 | return -ENOMEM; | |
426 | ||
b10b4711 | 427 | size = record->size; |
896fc1f0 AV |
428 | if (size + hlen > prz->buffer_size) |
429 | size = prz->buffer_size - hlen; | |
b10b4711 | 430 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 431 | |
cac2eb7b | 432 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
433 | |
434 | return 0; | |
435 | } | |
436 | ||
4c9ec219 KC |
437 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
438 | const char __user *buf) | |
5bf6d1b9 | 439 | { |
fdd03118 KC |
440 | if (record->type == PSTORE_TYPE_PMSG) { |
441 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
442 | |
443 | if (!cxt->mprz) | |
444 | return -ENOMEM; | |
fdd03118 | 445 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
446 | } |
447 | ||
448 | return -EINVAL; | |
449 | } | |
450 | ||
a61072aa | 451 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 452 | { |
a61072aa | 453 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 454 | struct persistent_ram_zone *prz; |
9ba80d99 | 455 | |
a61072aa | 456 | switch (record->type) { |
b5d38e9b | 457 | case PSTORE_TYPE_DMESG: |
a61072aa | 458 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 459 | return -EINVAL; |
a61072aa | 460 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
461 | break; |
462 | case PSTORE_TYPE_CONSOLE: | |
463 | prz = cxt->cprz; | |
464 | break; | |
a694d1b5 | 465 | case PSTORE_TYPE_FTRACE: |
a61072aa | 466 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 467 | return -EINVAL; |
a61072aa | 468 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 469 | break; |
9d5438f4 MS |
470 | case PSTORE_TYPE_PMSG: |
471 | prz = cxt->mprz; | |
472 | break; | |
b5d38e9b | 473 | default: |
9ba80d99 | 474 | return -EINVAL; |
b5d38e9b | 475 | } |
9ba80d99 | 476 | |
b5d38e9b AV |
477 | persistent_ram_free_old(prz); |
478 | persistent_ram_zap(prz); | |
9ba80d99 KC |
479 | |
480 | return 0; | |
56d611a0 MS |
481 | } |
482 | ||
9ba80d99 KC |
483 | static struct ramoops_context oops_cxt = { |
484 | .pstore = { | |
485 | .owner = THIS_MODULE, | |
486 | .name = "ramoops", | |
487 | .open = ramoops_pstore_open, | |
488 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
489 | .write = ramoops_pstore_write, |
490 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
491 | .erase = ramoops_pstore_erase, |
492 | }, | |
493 | }; | |
494 | ||
f4c5d242 AV |
495 | static void ramoops_free_przs(struct ramoops_context *cxt) |
496 | { | |
497 | int i; | |
498 | ||
a1cf53ac | 499 | /* Free dump PRZs */ |
a5d23b95 | 500 | if (cxt->dprzs) { |
a1cf53ac | 501 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 502 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 503 | |
a5d23b95 | 504 | kfree(cxt->dprzs); |
a1cf53ac JF |
505 | cxt->max_dump_cnt = 0; |
506 | } | |
4407de74 | 507 | |
a1cf53ac JF |
508 | /* Free ftrace PRZs */ |
509 | if (cxt->fprzs) { | |
510 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
511 | persistent_ram_free(cxt->fprzs[i]); | |
512 | kfree(cxt->fprzs); | |
513 | cxt->max_ftrace_cnt = 0; | |
514 | } | |
f4c5d242 AV |
515 | } |
516 | ||
c443a5f3 KC |
517 | static int ramoops_init_przs(const char *name, |
518 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
519 | struct persistent_ram_zone ***przs, |
520 | phys_addr_t *paddr, size_t mem_sz, | |
521 | ssize_t record_size, | |
522 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
523 | { |
524 | int err = -ENOMEM; | |
525 | int i; | |
de832092 KC |
526 | size_t zone_sz; |
527 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 528 | |
de832092 KC |
529 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
530 | if (mem_sz == 0 || record_size == 0) { | |
531 | *cnt = 0; | |
f4c5d242 | 532 | return 0; |
c6289378 AH |
533 | } |
534 | ||
de832092 KC |
535 | /* |
536 | * If we have a negative record size, calculate it based on | |
537 | * mem_sz / *cnt. If we have a positive record size, calculate | |
538 | * cnt from mem_sz / record_size. | |
539 | */ | |
540 | if (record_size < 0) { | |
541 | if (*cnt == 0) | |
542 | return 0; | |
543 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
544 | if (record_size == 0) { |
545 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
546 | name, mem_sz, *cnt); | |
de832092 | 547 | goto fail; |
c443a5f3 | 548 | } |
de832092 KC |
549 | } else { |
550 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
551 | if (*cnt == 0) { |
552 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
553 | name, mem_sz, record_size); | |
de832092 | 554 | goto fail; |
c443a5f3 | 555 | } |
de832092 | 556 | } |
f4c5d242 | 557 | |
de832092 | 558 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
559 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
560 | name, | |
de832092 KC |
561 | mem_sz, (unsigned long long)*paddr, |
562 | cxt->size, (unsigned long long)cxt->phys_addr); | |
563 | goto fail; | |
f4c5d242 AV |
564 | } |
565 | ||
de832092 | 566 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
567 | if (!zone_sz) { |
568 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 569 | goto fail; |
c443a5f3 | 570 | } |
de832092 KC |
571 | |
572 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
573 | if (!prz_ar) | |
574 | goto fail; | |
575 | ||
576 | for (i = 0; i < *cnt; i++) { | |
1227daa4 KC |
577 | char *label; |
578 | ||
579 | if (*cnt == 1) | |
580 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); | |
581 | else | |
582 | label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)", | |
583 | name, i, *cnt - 1); | |
de832092 | 584 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
1227daa4 KC |
585 | &cxt->ecc_info, |
586 | cxt->memtype, flags, label); | |
de832092 KC |
587 | if (IS_ERR(prz_ar[i])) { |
588 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
589 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
590 | name, record_size, | |
591 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
592 | |
593 | while (i > 0) { | |
594 | i--; | |
de832092 | 595 | persistent_ram_free(prz_ar[i]); |
4407de74 | 596 | } |
de832092 KC |
597 | kfree(prz_ar); |
598 | goto fail; | |
f4c5d242 | 599 | } |
de832092 | 600 | *paddr += zone_sz; |
f0f23e54 | 601 | prz_ar[i]->type = pstore_name_to_type(name); |
f4c5d242 AV |
602 | } |
603 | ||
de832092 | 604 | *przs = prz_ar; |
f4c5d242 | 605 | return 0; |
de832092 KC |
606 | |
607 | fail: | |
608 | *cnt = 0; | |
f4c5d242 AV |
609 | return err; |
610 | } | |
611 | ||
c443a5f3 KC |
612 | static int ramoops_init_prz(const char *name, |
613 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
614 | struct persistent_ram_zone **prz, |
615 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b | 616 | { |
1227daa4 KC |
617 | char *label; |
618 | ||
b5d38e9b AV |
619 | if (!sz) |
620 | return 0; | |
621 | ||
c6289378 | 622 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
623 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
624 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 625 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 626 | return -ENOMEM; |
c6289378 | 627 | } |
b5d38e9b | 628 | |
1227daa4 | 629 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); |
663deb47 | 630 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
7684bd33 | 631 | cxt->memtype, PRZ_FLAG_ZAP_OLD, label); |
b5d38e9b AV |
632 | if (IS_ERR(*prz)) { |
633 | int err = PTR_ERR(*prz); | |
634 | ||
c443a5f3 KC |
635 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
636 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
637 | return err; |
638 | } | |
639 | ||
b5d38e9b | 640 | *paddr += sz; |
f0f23e54 | 641 | (*prz)->type = pstore_name_to_type(name); |
b5d38e9b AV |
642 | |
643 | return 0; | |
644 | } | |
645 | ||
35da6094 GH |
646 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
647 | const char *propname, u32 *value) | |
648 | { | |
649 | u32 val32 = 0; | |
650 | int ret; | |
651 | ||
652 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
653 | if (ret < 0 && ret != -EINVAL) { | |
654 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
655 | propname, ret); | |
656 | return ret; | |
657 | } | |
658 | ||
659 | if (val32 > INT_MAX) { | |
660 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
661 | return -EOVERFLOW; | |
662 | } | |
663 | ||
664 | *value = val32; | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static int ramoops_parse_dt(struct platform_device *pdev, | |
669 | struct ramoops_platform_data *pdata) | |
670 | { | |
671 | struct device_node *of_node = pdev->dev.of_node; | |
529182e2 | 672 | struct resource *res; |
35da6094 GH |
673 | u32 value; |
674 | int ret; | |
675 | ||
676 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
677 | ||
529182e2 KC |
678 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
679 | if (!res) { | |
35da6094 | 680 | dev_err(&pdev->dev, |
529182e2 KC |
681 | "failed to locate DT /reserved-memory resource\n"); |
682 | return -EINVAL; | |
35da6094 GH |
683 | } |
684 | ||
529182e2 KC |
685 | pdata->mem_size = resource_size(res); |
686 | pdata->mem_address = res->start; | |
35da6094 GH |
687 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
688 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
689 | ||
690 | #define parse_size(name, field) { \ | |
691 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
692 | if (ret < 0) \ | |
693 | return ret; \ | |
694 | field = value; \ | |
695 | } | |
696 | ||
697 | parse_size("record-size", pdata->record_size); | |
698 | parse_size("console-size", pdata->console_size); | |
699 | parse_size("ftrace-size", pdata->ftrace_size); | |
700 | parse_size("pmsg-size", pdata->pmsg_size); | |
701 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
a1cf53ac | 702 | parse_size("flags", pdata->flags); |
35da6094 GH |
703 | |
704 | #undef parse_size | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
f568f6ca | 709 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 710 | { |
896fc1f0 | 711 | struct device *dev = &pdev->dev; |
35da6094 | 712 | struct ramoops_platform_data *pdata = dev->platform_data; |
5631e857 | 713 | struct ramoops_platform_data pdata_local; |
56d611a0 | 714 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
715 | size_t dump_mem_sz; |
716 | phys_addr_t paddr; | |
56d611a0 MS |
717 | int err = -EINVAL; |
718 | ||
fc46d4e4 KC |
719 | /* |
720 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
721 | * probes. |
722 | */ | |
fc46d4e4 KC |
723 | if (cxt->max_dump_cnt) { |
724 | pr_err("already initialized\n"); | |
9ba80d99 | 725 | goto fail_out; |
fc46d4e4 KC |
726 | } |
727 | ||
1e0f67a9 YH |
728 | if (dev_of_node(dev) && !pdata) { |
729 | pdata = &pdata_local; | |
730 | memset(pdata, 0, sizeof(*pdata)); | |
731 | ||
732 | err = ramoops_parse_dt(pdev, pdata); | |
733 | if (err < 0) | |
734 | goto fail_out; | |
735 | } | |
736 | ||
fc46d4e4 KC |
737 | /* Make sure we didn't get bogus platform data pointer. */ |
738 | if (!pdata) { | |
739 | pr_err("NULL platform data\n"); | |
740 | goto fail_out; | |
741 | } | |
9ba80d99 | 742 | |
a694d1b5 | 743 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 744 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 745 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 746 | "non-zero\n"); |
9ba80d99 | 747 | goto fail_out; |
56d611a0 MS |
748 | } |
749 | ||
3bd11cf5 | 750 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 751 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 752 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 753 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 754 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 755 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
756 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
757 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 758 | |
13aefd72 MS |
759 | cxt->size = pdata->mem_size; |
760 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 761 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 762 | cxt->record_size = pdata->record_size; |
b5d38e9b | 763 | cxt->console_size = pdata->console_size; |
a694d1b5 | 764 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 765 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 766 | cxt->dump_oops = pdata->dump_oops; |
a1cf53ac | 767 | cxt->flags = pdata->flags; |
c31ad081 | 768 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 769 | |
f4c5d242 | 770 | paddr = cxt->phys_addr; |
896fc1f0 | 771 | |
9d5438f4 MS |
772 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
773 | - cxt->pmsg_size; | |
f0f23e54 | 774 | err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
775 | dump_mem_sz, cxt->record_size, |
776 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
777 | if (err) |
778 | goto fail_out; | |
779 | ||
c443a5f3 | 780 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 781 | cxt->console_size, 0); |
b5d38e9b AV |
782 | if (err) |
783 | goto fail_init_cprz; | |
784 | ||
a1cf53ac JF |
785 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
786 | ? nr_cpu_ids | |
787 | : 1; | |
c443a5f3 KC |
788 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
789 | cxt->ftrace_size, -1, | |
790 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
791 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
792 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
793 | if (err) |
794 | goto fail_init_fprz; | |
795 | ||
c443a5f3 KC |
796 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
797 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
798 | if (err) |
799 | goto fail_init_mprz; | |
800 | ||
9ba80d99 | 801 | cxt->pstore.data = cxt; |
b5d38e9b | 802 | /* |
89d328f6 KC |
803 | * Since bufsize is only used for dmesg crash dumps, it |
804 | * must match the size of the dprz record (after PRZ header | |
805 | * and ECC bytes have been accounted for). | |
b5d38e9b | 806 | */ |
89d328f6 KC |
807 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; |
808 | cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); | |
9ba80d99 | 809 | if (!cxt->pstore.buf) { |
89d328f6 | 810 | pr_err("cannot allocate pstore crash dump buffer\n"); |
47110b88 | 811 | err = -ENOMEM; |
9ba80d99 KC |
812 | goto fail_clear; |
813 | } | |
814 | ||
79d955af NK |
815 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; |
816 | if (cxt->console_size) | |
817 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
818 | if (cxt->ftrace_size) | |
819 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; | |
820 | if (cxt->pmsg_size) | |
821 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 822 | |
9ba80d99 | 823 | err = pstore_register(&cxt->pstore); |
56d611a0 | 824 | if (err) { |
9ba80d99 | 825 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 826 | goto fail_buf; |
56d611a0 MS |
827 | } |
828 | ||
c755201e KC |
829 | /* |
830 | * Update the module parameter variables as well so they are visible | |
831 | * through /sys/module/ramoops/parameters/ | |
832 | */ | |
833 | mem_size = pdata->mem_size; | |
834 | mem_address = pdata->mem_address; | |
835 | record_size = pdata->record_size; | |
836 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
837 | ramoops_console_size = pdata->console_size; |
838 | ramoops_pmsg_size = pdata->pmsg_size; | |
839 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 840 | |
dc80b1ea | 841 | pr_info("using 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 842 | cxt->size, (unsigned long long)cxt->phys_addr, |
dc80b1ea | 843 | cxt->ecc_info.ecc_size); |
9ba80d99 | 844 | |
56d611a0 MS |
845 | return 0; |
846 | ||
9ba80d99 KC |
847 | fail_buf: |
848 | kfree(cxt->pstore.buf); | |
849 | fail_clear: | |
850 | cxt->pstore.bufsize = 0; | |
e976e564 | 851 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 852 | fail_init_mprz: |
a694d1b5 | 853 | fail_init_fprz: |
e976e564 | 854 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 855 | fail_init_cprz: |
f4c5d242 | 856 | ramoops_free_przs(cxt); |
9ba80d99 | 857 | fail_out: |
56d611a0 MS |
858 | return err; |
859 | } | |
860 | ||
ee1d2674 | 861 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
862 | { |
863 | struct ramoops_context *cxt = &oops_cxt; | |
864 | ||
ee1d2674 | 865 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 866 | |
9ba80d99 KC |
867 | kfree(cxt->pstore.buf); |
868 | cxt->pstore.bufsize = 0; | |
869 | ||
ee1d2674 | 870 | persistent_ram_free(cxt->mprz); |
ee1d2674 GT |
871 | persistent_ram_free(cxt->cprz); |
872 | ramoops_free_przs(cxt); | |
873 | ||
c3b92ce9 | 874 | return 0; |
56d611a0 MS |
875 | } |
876 | ||
35da6094 GH |
877 | static const struct of_device_id dt_match[] = { |
878 | { .compatible = "ramoops" }, | |
879 | {} | |
880 | }; | |
881 | ||
c3b92ce9 | 882 | static struct platform_driver ramoops_driver = { |
924d3711 | 883 | .probe = ramoops_probe, |
ee1d2674 | 884 | .remove = ramoops_remove, |
c3b92ce9 | 885 | .driver = { |
35da6094 GH |
886 | .name = "ramoops", |
887 | .of_match_table = dt_match, | |
c3b92ce9 KP |
888 | }, |
889 | }; | |
890 | ||
bac6f6cd | 891 | static inline void ramoops_unregister_dummy(void) |
c3b92ce9 | 892 | { |
bac6f6cd KC |
893 | platform_device_unregister(dummy); |
894 | dummy = NULL; | |
bac6f6cd KC |
895 | } |
896 | ||
897 | static void __init ramoops_register_dummy(void) | |
898 | { | |
182ca6e0 YH |
899 | struct ramoops_platform_data pdata; |
900 | ||
bac6f6cd KC |
901 | /* |
902 | * Prepare a dummy platform data structure to carry the module | |
903 | * parameters. If mem_size isn't set, then there are no module | |
904 | * parameters, and we can skip this. | |
905 | */ | |
924d3711 AV |
906 | if (!mem_size) |
907 | return; | |
908 | ||
909 | pr_info("using module parameters\n"); | |
910 | ||
182ca6e0 YH |
911 | memset(&pdata, 0, sizeof(pdata)); |
912 | pdata.mem_size = mem_size; | |
913 | pdata.mem_address = mem_address; | |
914 | pdata.mem_type = mem_type; | |
915 | pdata.record_size = record_size; | |
916 | pdata.console_size = ramoops_console_size; | |
917 | pdata.ftrace_size = ramoops_ftrace_size; | |
918 | pdata.pmsg_size = ramoops_pmsg_size; | |
919 | pdata.dump_oops = dump_oops; | |
920 | pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU; | |
a1cf53ac | 921 | |
5ca5d4e6 AV |
922 | /* |
923 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
924 | * (using 1 byte for ECC isn't much of use anyway). | |
925 | */ | |
182ca6e0 | 926 | pdata.ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
927 | |
928 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
182ca6e0 | 929 | &pdata, sizeof(pdata)); |
924d3711 AV |
930 | if (IS_ERR(dummy)) { |
931 | pr_info("could not create platform device: %ld\n", | |
932 | PTR_ERR(dummy)); | |
bac6f6cd KC |
933 | dummy = NULL; |
934 | ramoops_unregister_dummy(); | |
924d3711 AV |
935 | } |
936 | } | |
937 | ||
938 | static int __init ramoops_init(void) | |
939 | { | |
bac6f6cd KC |
940 | int ret; |
941 | ||
924d3711 | 942 | ramoops_register_dummy(); |
bac6f6cd KC |
943 | ret = platform_driver_register(&ramoops_driver); |
944 | if (ret != 0) | |
945 | ramoops_unregister_dummy(); | |
946 | ||
947 | return ret; | |
c3b92ce9 | 948 | } |
41603165 | 949 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
950 | |
951 | static void __exit ramoops_exit(void) | |
952 | { | |
953 | platform_driver_unregister(&ramoops_driver); | |
bac6f6cd | 954 | ramoops_unregister_dummy(); |
c3b92ce9 | 955 | } |
56d611a0 MS |
956 | module_exit(ramoops_exit); |
957 | ||
958 | MODULE_LICENSE("GPL"); | |
959 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
960 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |