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Commit | Line | Data |
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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/time.h> |
31 | #include <linux/io.h> | |
32 | #include <linux/ioport.h> | |
c3b92ce9 | 33 | #include <linux/platform_device.h> |
13aefd72 | 34 | #include <linux/slab.h> |
24203036 | 35 | #include <linux/compiler.h> |
1894a253 | 36 | #include <linux/pstore_ram.h> |
35da6094 GH |
37 | #include <linux/of.h> |
38 | #include <linux/of_address.h> | |
56d611a0 MS |
39 | |
40 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 41 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 42 | |
3e5c4fad SI |
43 | static ulong record_size = MIN_MEM_SIZE; |
44 | module_param(record_size, ulong, 0400); | |
45 | MODULE_PARM_DESC(record_size, | |
46 | "size of each dump done on oops/panic"); | |
56d611a0 | 47 | |
b5d38e9b AV |
48 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
49 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
50 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
51 | ||
a694d1b5 AV |
52 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
53 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
54 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
55 | ||
9d5438f4 MS |
56 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
57 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
58 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
59 | ||
764fd639 | 60 | static unsigned long long mem_address; |
b90fe0c4 | 61 | module_param_hw(mem_address, ullong, other, 0400); |
56d611a0 MS |
62 | MODULE_PARM_DESC(mem_address, |
63 | "start of reserved RAM used to store oops/panic logs"); | |
64 | ||
65 | static ulong mem_size; | |
66 | module_param(mem_size, ulong, 0400); | |
67 | MODULE_PARM_DESC(mem_size, | |
68 | "size of reserved RAM used to store oops/panic logs"); | |
69 | ||
027bc8b0 TL |
70 | static unsigned int mem_type; |
71 | module_param(mem_type, uint, 0600); | |
72 | MODULE_PARM_DESC(mem_type, | |
73 | "set to 1 to try to use unbuffered memory (default 0)"); | |
74 | ||
56d611a0 MS |
75 | static int dump_oops = 1; |
76 | module_param(dump_oops, int, 0600); | |
77 | MODULE_PARM_DESC(dump_oops, | |
78 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
79 | ||
39eb7e97 AV |
80 | static int ramoops_ecc; |
81 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
82 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
83 | "if non-zero, the option enables ECC support and specifies " |
84 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
85 | "bytes ECC)"); | |
39eb7e97 | 86 | |
9ba80d99 | 87 | struct ramoops_context { |
a5d23b95 KC |
88 | struct persistent_ram_zone **dprzs; /* Oops dump zones */ |
89 | struct persistent_ram_zone *cprz; /* Console zone */ | |
90 | struct persistent_ram_zone **fprzs; /* Ftrace zones */ | |
91 | struct persistent_ram_zone *mprz; /* PMSG zone */ | |
56d611a0 MS |
92 | phys_addr_t phys_addr; |
93 | unsigned long size; | |
027bc8b0 | 94 | unsigned int memtype; |
9ba80d99 | 95 | size_t record_size; |
b5d38e9b | 96 | size_t console_size; |
a694d1b5 | 97 | size_t ftrace_size; |
9d5438f4 | 98 | size_t pmsg_size; |
6b4d2a27 | 99 | int dump_oops; |
a1cf53ac | 100 | u32 flags; |
c31ad081 | 101 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
102 | unsigned int max_dump_cnt; |
103 | unsigned int dump_write_cnt; | |
57fd8353 | 104 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 105 | unsigned int dump_read_cnt; |
b5d38e9b | 106 | unsigned int console_read_cnt; |
a1cf53ac | 107 | unsigned int max_ftrace_cnt; |
a694d1b5 | 108 | unsigned int ftrace_read_cnt; |
9d5438f4 | 109 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
110 | struct pstore_info pstore; |
111 | }; | |
56d611a0 | 112 | |
13aefd72 MS |
113 | static struct platform_device *dummy; |
114 | static struct ramoops_platform_data *dummy_data; | |
115 | ||
9ba80d99 KC |
116 | static int ramoops_pstore_open(struct pstore_info *psi) |
117 | { | |
118 | struct ramoops_context *cxt = psi->data; | |
119 | ||
cac2eb7b | 120 | cxt->dump_read_cnt = 0; |
b5d38e9b | 121 | cxt->console_read_cnt = 0; |
57fd8353 | 122 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 123 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
124 | return 0; |
125 | } | |
126 | ||
755d66b4 AV |
127 | static struct persistent_ram_zone * |
128 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
129 | u64 *id, | |
130 | enum pstore_type_id *typep, enum pstore_type_id type, | |
131 | bool update) | |
132 | { | |
133 | struct persistent_ram_zone *prz; | |
134 | int i = (*c)++; | |
135 | ||
46418413 KC |
136 | /* Give up if we never existed or have hit the end. */ |
137 | if (!przs || i >= max) | |
755d66b4 AV |
138 | return NULL; |
139 | ||
140 | prz = przs[i]; | |
b0aa931f LS |
141 | if (!prz) |
142 | return NULL; | |
755d66b4 | 143 | |
aa9a4a1e LS |
144 | /* Update old/shadowed buffer. */ |
145 | if (update) | |
755d66b4 | 146 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
147 | |
148 | if (!persistent_ram_old_size(prz)) | |
149 | return NULL; | |
755d66b4 AV |
150 | |
151 | *typep = type; | |
152 | *id = i; | |
153 | ||
154 | return prz; | |
155 | } | |
156 | ||
a28726b4 | 157 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
3f8f80f0 AB |
158 | bool *compressed) |
159 | { | |
160 | char data_type; | |
a28726b4 | 161 | int header_length = 0; |
3f8f80f0 | 162 | |
a28726b4 BZ |
163 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
164 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
3f8f80f0 AB |
165 | if (data_type == 'C') |
166 | *compressed = true; | |
167 | else | |
168 | *compressed = false; | |
a28726b4 BZ |
169 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
170 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
3f8f80f0 AB |
171 | *compressed = false; |
172 | } else { | |
173 | time->tv_sec = 0; | |
174 | time->tv_nsec = 0; | |
175 | *compressed = false; | |
176 | } | |
a28726b4 | 177 | return header_length; |
3f8f80f0 AB |
178 | } |
179 | ||
f44f9652 MS |
180 | static bool prz_ok(struct persistent_ram_zone *prz) |
181 | { | |
182 | return !!prz && !!(persistent_ram_old_size(prz) + | |
183 | persistent_ram_ecc_string(prz, NULL, 0)); | |
184 | } | |
185 | ||
2fbea82b JF |
186 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
187 | struct persistent_ram_zone *src) | |
188 | { | |
189 | size_t dest_size, src_size, total, dest_off, src_off; | |
190 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
191 | void *merged_buf; | |
192 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
193 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
194 | ||
195 | dest_off = dest->old_log_size % record_size; | |
196 | dest_size = dest->old_log_size - dest_off; | |
197 | ||
198 | src_off = src->old_log_size % record_size; | |
199 | src_size = src->old_log_size - src_off; | |
200 | ||
201 | total = dest_size + src_size; | |
202 | merged_buf = kmalloc(total, GFP_KERNEL); | |
203 | if (!merged_buf) | |
204 | return -ENOMEM; | |
205 | ||
206 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
207 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
208 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
209 | ||
210 | while (dest_size > 0 && src_size > 0) { | |
211 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
212 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
213 | mrec[merged_idx++] = drec[dest_idx++]; | |
214 | dest_size -= record_size; | |
215 | } else { | |
216 | mrec[merged_idx++] = srec[src_idx++]; | |
217 | src_size -= record_size; | |
218 | } | |
219 | } | |
220 | ||
221 | while (dest_size > 0) { | |
222 | mrec[merged_idx++] = drec[dest_idx++]; | |
223 | dest_size -= record_size; | |
224 | } | |
225 | ||
226 | while (src_size > 0) { | |
227 | mrec[merged_idx++] = srec[src_idx++]; | |
228 | src_size -= record_size; | |
229 | } | |
230 | ||
231 | kfree(dest->old_log); | |
232 | dest->old_log = merged_buf; | |
233 | dest->old_log_size = total; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
125cc42b | 238 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 239 | { |
2fbea82b | 240 | ssize_t size = 0; |
125cc42b | 241 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
242 | struct persistent_ram_zone *prz = NULL; |
243 | int header_length = 0; | |
2fbea82b | 244 | bool free_prz = false; |
e036bd33 | 245 | |
125cc42b KC |
246 | /* |
247 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
248 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
249 | * valid time stamps, so it is initialized to zero. | |
250 | */ | |
125cc42b KC |
251 | record->time.tv_sec = 0; |
252 | record->time.tv_nsec = 0; | |
253 | record->compressed = false; | |
e036bd33 BZ |
254 | |
255 | /* Find the next valid persistent_ram_zone for DMESG */ | |
256 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
a5d23b95 | 257 | prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt, |
125cc42b KC |
258 | cxt->max_dump_cnt, &record->id, |
259 | &record->type, | |
e036bd33 BZ |
260 | PSTORE_TYPE_DMESG, 1); |
261 | if (!prz_ok(prz)) | |
262 | continue; | |
263 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
264 | &record->time, |
265 | &record->compressed); | |
e036bd33 BZ |
266 | /* Clear and skip this DMESG record if it has no valid header */ |
267 | if (!header_length) { | |
268 | persistent_ram_free_old(prz); | |
269 | persistent_ram_zap(prz); | |
270 | prz = NULL; | |
271 | } | |
272 | } | |
9ba80d99 | 273 | |
f44f9652 | 274 | if (!prz_ok(prz)) |
b5d38e9b | 275 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
125cc42b KC |
276 | 1, &record->id, &record->type, |
277 | PSTORE_TYPE_CONSOLE, 0); | |
2fbea82b JF |
278 | |
279 | if (!prz_ok(prz)) | |
280 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, | |
125cc42b KC |
281 | 1, &record->id, &record->type, |
282 | PSTORE_TYPE_PMSG, 0); | |
2fbea82b JF |
283 | |
284 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 285 | if (!prz_ok(prz)) { |
2fbea82b | 286 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) { |
a1cf53ac | 287 | prz = ramoops_get_next_prz(cxt->fprzs, |
125cc42b KC |
288 | &cxt->ftrace_read_cnt, 1, &record->id, |
289 | &record->type, PSTORE_TYPE_FTRACE, 0); | |
2fbea82b JF |
290 | } else { |
291 | /* | |
292 | * Build a new dummy record which combines all the | |
293 | * per-cpu records including metadata and ecc info. | |
294 | */ | |
295 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
296 | ||
297 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
298 | GFP_KERNEL); | |
299 | if (!tmp_prz) | |
300 | return -ENOMEM; | |
301 | free_prz = true; | |
302 | ||
303 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
304 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
305 | &cxt->ftrace_read_cnt, | |
125cc42b KC |
306 | cxt->max_ftrace_cnt, |
307 | &record->id, | |
308 | &record->type, | |
309 | PSTORE_TYPE_FTRACE, 0); | |
2fbea82b JF |
310 | |
311 | if (!prz_ok(prz_next)) | |
312 | continue; | |
313 | ||
314 | tmp_prz->ecc_info = prz_next->ecc_info; | |
315 | tmp_prz->corrected_bytes += | |
316 | prz_next->corrected_bytes; | |
317 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
318 | size = ftrace_log_combine(tmp_prz, prz_next); | |
319 | if (size) | |
320 | goto out; | |
321 | } | |
125cc42b | 322 | record->id = 0; |
2fbea82b | 323 | prz = tmp_prz; |
a1cf53ac JF |
324 | } |
325 | } | |
326 | ||
2fbea82b JF |
327 | if (!prz_ok(prz)) { |
328 | size = 0; | |
329 | goto out; | |
330 | } | |
896fc1f0 | 331 | |
e036bd33 | 332 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
333 | |
334 | /* ECC correction notice */ | |
125cc42b | 335 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 336 | |
125cc42b KC |
337 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
338 | if (record->buf == NULL) { | |
2fbea82b JF |
339 | size = -ENOMEM; |
340 | goto out; | |
341 | } | |
9ba80d99 | 342 | |
125cc42b KC |
343 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
344 | size); | |
2fbea82b | 345 | |
125cc42b KC |
346 | persistent_ram_ecc_string(prz, record->buf + size, |
347 | record->ecc_notice_size + 1); | |
bd08ec33 | 348 | |
2fbea82b JF |
349 | out: |
350 | if (free_prz) { | |
351 | kfree(prz->old_log); | |
352 | kfree(prz); | |
353 | } | |
354 | ||
8cfc8ddc | 355 | return size; |
9ba80d99 KC |
356 | } |
357 | ||
3f8f80f0 AB |
358 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
359 | bool compressed) | |
896fc1f0 AV |
360 | { |
361 | char *hdr; | |
1e817fb6 | 362 | struct timespec timestamp; |
896fc1f0 AV |
363 | size_t len; |
364 | ||
1e817fb6 KC |
365 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
366 | if (__getnstimeofday(×tamp)) { | |
367 | timestamp.tv_sec = 0; | |
368 | timestamp.tv_nsec = 0; | |
369 | } | |
3f8f80f0 AB |
370 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
371 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
372 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
373 | WARN_ON_ONCE(!hdr); |
374 | len = hdr ? strlen(hdr) : 0; | |
375 | persistent_ram_write(prz, hdr, len); | |
376 | kfree(hdr); | |
377 | ||
378 | return len; | |
379 | } | |
380 | ||
4c9ec219 | 381 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 382 | { |
b10b4711 | 383 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 384 | struct persistent_ram_zone *prz; |
b10b4711 | 385 | size_t size, hlen; |
9ba80d99 | 386 | |
b10b4711 | 387 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
388 | if (!cxt->cprz) |
389 | return -ENOMEM; | |
b10b4711 | 390 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 391 | return 0; |
b10b4711 | 392 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
393 | int zonenum; |
394 | ||
395 | if (!cxt->fprzs) | |
a694d1b5 | 396 | return -ENOMEM; |
a1cf53ac JF |
397 | /* |
398 | * Choose zone by if we're using per-cpu buffers. | |
399 | */ | |
400 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
401 | zonenum = smp_processor_id(); | |
402 | else | |
403 | zonenum = 0; | |
404 | ||
b10b4711 KC |
405 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
406 | record->size); | |
a694d1b5 | 407 | return 0; |
b10b4711 | 408 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
409 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
410 | return -EINVAL; | |
b5d38e9b AV |
411 | } |
412 | ||
b10b4711 | 413 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 414 | return -EINVAL; |
56d611a0 | 415 | |
b10b4711 KC |
416 | /* |
417 | * Out of the various dmesg dump types, ramoops is currently designed | |
9ba80d99 KC |
418 | * to only store crash logs, rather than storing general kernel logs. |
419 | */ | |
b10b4711 KC |
420 | if (record->reason != KMSG_DUMP_OOPS && |
421 | record->reason != KMSG_DUMP_PANIC) | |
9ba80d99 | 422 | return -EINVAL; |
fc2d557c | 423 | |
9ba80d99 | 424 | /* Skip Oopes when configured to do so. */ |
b10b4711 | 425 | if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
426 | return -EINVAL; |
427 | ||
b10b4711 KC |
428 | /* |
429 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
430 | * If our buffer is larger than kmsg_bytes, this can never happen, |
431 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
432 | * report split across multiple records. | |
433 | */ | |
b10b4711 | 434 | if (record->part != 1) |
9ba80d99 | 435 | return -ENOSPC; |
56d611a0 | 436 | |
a5d23b95 | 437 | if (!cxt->dprzs) |
c6289378 AH |
438 | return -ENOSPC; |
439 | ||
a5d23b95 | 440 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 441 | |
b10b4711 KC |
442 | /* Build header and append record contents. */ |
443 | hlen = ramoops_write_kmsg_hdr(prz, record->compressed); | |
444 | size = record->size; | |
896fc1f0 AV |
445 | if (size + hlen > prz->buffer_size) |
446 | size = prz->buffer_size - hlen; | |
b10b4711 | 447 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 448 | |
cac2eb7b | 449 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
450 | |
451 | return 0; | |
452 | } | |
453 | ||
4c9ec219 KC |
454 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
455 | const char __user *buf) | |
5bf6d1b9 | 456 | { |
fdd03118 KC |
457 | if (record->type == PSTORE_TYPE_PMSG) { |
458 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
459 | |
460 | if (!cxt->mprz) | |
461 | return -ENOMEM; | |
fdd03118 | 462 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
463 | } |
464 | ||
465 | return -EINVAL; | |
466 | } | |
467 | ||
a61072aa | 468 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 469 | { |
a61072aa | 470 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 471 | struct persistent_ram_zone *prz; |
9ba80d99 | 472 | |
a61072aa | 473 | switch (record->type) { |
b5d38e9b | 474 | case PSTORE_TYPE_DMESG: |
a61072aa | 475 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 476 | return -EINVAL; |
a61072aa | 477 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
478 | break; |
479 | case PSTORE_TYPE_CONSOLE: | |
480 | prz = cxt->cprz; | |
481 | break; | |
a694d1b5 | 482 | case PSTORE_TYPE_FTRACE: |
a61072aa | 483 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 484 | return -EINVAL; |
a61072aa | 485 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 486 | break; |
9d5438f4 MS |
487 | case PSTORE_TYPE_PMSG: |
488 | prz = cxt->mprz; | |
489 | break; | |
b5d38e9b | 490 | default: |
9ba80d99 | 491 | return -EINVAL; |
b5d38e9b | 492 | } |
9ba80d99 | 493 | |
b5d38e9b AV |
494 | persistent_ram_free_old(prz); |
495 | persistent_ram_zap(prz); | |
9ba80d99 KC |
496 | |
497 | return 0; | |
56d611a0 MS |
498 | } |
499 | ||
9ba80d99 KC |
500 | static struct ramoops_context oops_cxt = { |
501 | .pstore = { | |
502 | .owner = THIS_MODULE, | |
503 | .name = "ramoops", | |
504 | .open = ramoops_pstore_open, | |
505 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
506 | .write = ramoops_pstore_write, |
507 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
508 | .erase = ramoops_pstore_erase, |
509 | }, | |
510 | }; | |
511 | ||
f4c5d242 AV |
512 | static void ramoops_free_przs(struct ramoops_context *cxt) |
513 | { | |
514 | int i; | |
515 | ||
a1cf53ac | 516 | /* Free dump PRZs */ |
a5d23b95 | 517 | if (cxt->dprzs) { |
a1cf53ac | 518 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 519 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 520 | |
a5d23b95 | 521 | kfree(cxt->dprzs); |
a1cf53ac JF |
522 | cxt->max_dump_cnt = 0; |
523 | } | |
4407de74 | 524 | |
a1cf53ac JF |
525 | /* Free ftrace PRZs */ |
526 | if (cxt->fprzs) { | |
527 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
528 | persistent_ram_free(cxt->fprzs[i]); | |
529 | kfree(cxt->fprzs); | |
530 | cxt->max_ftrace_cnt = 0; | |
531 | } | |
f4c5d242 AV |
532 | } |
533 | ||
c443a5f3 KC |
534 | static int ramoops_init_przs(const char *name, |
535 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
536 | struct persistent_ram_zone ***przs, |
537 | phys_addr_t *paddr, size_t mem_sz, | |
538 | ssize_t record_size, | |
539 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
540 | { |
541 | int err = -ENOMEM; | |
542 | int i; | |
de832092 KC |
543 | size_t zone_sz; |
544 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 545 | |
de832092 KC |
546 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
547 | if (mem_sz == 0 || record_size == 0) { | |
548 | *cnt = 0; | |
f4c5d242 | 549 | return 0; |
c6289378 AH |
550 | } |
551 | ||
de832092 KC |
552 | /* |
553 | * If we have a negative record size, calculate it based on | |
554 | * mem_sz / *cnt. If we have a positive record size, calculate | |
555 | * cnt from mem_sz / record_size. | |
556 | */ | |
557 | if (record_size < 0) { | |
558 | if (*cnt == 0) | |
559 | return 0; | |
560 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
561 | if (record_size == 0) { |
562 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
563 | name, mem_sz, *cnt); | |
de832092 | 564 | goto fail; |
c443a5f3 | 565 | } |
de832092 KC |
566 | } else { |
567 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
568 | if (*cnt == 0) { |
569 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
570 | name, mem_sz, record_size); | |
de832092 | 571 | goto fail; |
c443a5f3 | 572 | } |
de832092 | 573 | } |
f4c5d242 | 574 | |
de832092 | 575 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
576 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
577 | name, | |
de832092 KC |
578 | mem_sz, (unsigned long long)*paddr, |
579 | cxt->size, (unsigned long long)cxt->phys_addr); | |
580 | goto fail; | |
f4c5d242 AV |
581 | } |
582 | ||
de832092 | 583 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
584 | if (!zone_sz) { |
585 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 586 | goto fail; |
c443a5f3 | 587 | } |
de832092 KC |
588 | |
589 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
590 | if (!prz_ar) | |
591 | goto fail; | |
592 | ||
593 | for (i = 0; i < *cnt; i++) { | |
594 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, | |
027bc8b0 | 595 | &cxt->ecc_info, |
de832092 KC |
596 | cxt->memtype, flags); |
597 | if (IS_ERR(prz_ar[i])) { | |
598 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
599 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
600 | name, record_size, | |
601 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
602 | |
603 | while (i > 0) { | |
604 | i--; | |
de832092 | 605 | persistent_ram_free(prz_ar[i]); |
4407de74 | 606 | } |
de832092 KC |
607 | kfree(prz_ar); |
608 | goto fail; | |
f4c5d242 | 609 | } |
de832092 | 610 | *paddr += zone_sz; |
f4c5d242 AV |
611 | } |
612 | ||
de832092 | 613 | *przs = prz_ar; |
f4c5d242 | 614 | return 0; |
de832092 KC |
615 | |
616 | fail: | |
617 | *cnt = 0; | |
f4c5d242 AV |
618 | return err; |
619 | } | |
620 | ||
c443a5f3 KC |
621 | static int ramoops_init_prz(const char *name, |
622 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
623 | struct persistent_ram_zone **prz, |
624 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
625 | { |
626 | if (!sz) | |
627 | return 0; | |
628 | ||
c6289378 | 629 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
630 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
631 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 632 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 633 | return -ENOMEM; |
c6289378 | 634 | } |
b5d38e9b | 635 | |
663deb47 JF |
636 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
637 | cxt->memtype, 0); | |
b5d38e9b AV |
638 | if (IS_ERR(*prz)) { |
639 | int err = PTR_ERR(*prz); | |
640 | ||
c443a5f3 KC |
641 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
642 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
643 | return err; |
644 | } | |
645 | ||
646 | persistent_ram_zap(*prz); | |
647 | ||
648 | *paddr += sz; | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
35da6094 GH |
653 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
654 | const char *propname, u32 *value) | |
655 | { | |
656 | u32 val32 = 0; | |
657 | int ret; | |
658 | ||
659 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
660 | if (ret < 0 && ret != -EINVAL) { | |
661 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
662 | propname, ret); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | if (val32 > INT_MAX) { | |
667 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
668 | return -EOVERFLOW; | |
669 | } | |
670 | ||
671 | *value = val32; | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static int ramoops_parse_dt(struct platform_device *pdev, | |
676 | struct ramoops_platform_data *pdata) | |
677 | { | |
678 | struct device_node *of_node = pdev->dev.of_node; | |
529182e2 | 679 | struct resource *res; |
35da6094 GH |
680 | u32 value; |
681 | int ret; | |
682 | ||
683 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
684 | ||
529182e2 KC |
685 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
686 | if (!res) { | |
35da6094 | 687 | dev_err(&pdev->dev, |
529182e2 KC |
688 | "failed to locate DT /reserved-memory resource\n"); |
689 | return -EINVAL; | |
35da6094 GH |
690 | } |
691 | ||
529182e2 KC |
692 | pdata->mem_size = resource_size(res); |
693 | pdata->mem_address = res->start; | |
35da6094 GH |
694 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
695 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
696 | ||
697 | #define parse_size(name, field) { \ | |
698 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
699 | if (ret < 0) \ | |
700 | return ret; \ | |
701 | field = value; \ | |
702 | } | |
703 | ||
704 | parse_size("record-size", pdata->record_size); | |
705 | parse_size("console-size", pdata->console_size); | |
706 | parse_size("ftrace-size", pdata->ftrace_size); | |
707 | parse_size("pmsg-size", pdata->pmsg_size); | |
708 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
a1cf53ac | 709 | parse_size("flags", pdata->flags); |
35da6094 GH |
710 | |
711 | #undef parse_size | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
f568f6ca | 716 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 717 | { |
896fc1f0 | 718 | struct device *dev = &pdev->dev; |
35da6094 | 719 | struct ramoops_platform_data *pdata = dev->platform_data; |
56d611a0 | 720 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
721 | size_t dump_mem_sz; |
722 | phys_addr_t paddr; | |
56d611a0 MS |
723 | int err = -EINVAL; |
724 | ||
35da6094 GH |
725 | if (dev_of_node(dev) && !pdata) { |
726 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
727 | if (!pdata) { | |
c443a5f3 | 728 | pr_err("cannot allocate platform data buffer\n"); |
35da6094 GH |
729 | err = -ENOMEM; |
730 | goto fail_out; | |
731 | } | |
732 | ||
733 | err = ramoops_parse_dt(pdev, pdata); | |
734 | if (err < 0) | |
735 | goto fail_out; | |
736 | } | |
737 | ||
fc46d4e4 KC |
738 | /* |
739 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
740 | * probes. |
741 | */ | |
fc46d4e4 KC |
742 | if (cxt->max_dump_cnt) { |
743 | pr_err("already initialized\n"); | |
9ba80d99 | 744 | goto fail_out; |
fc46d4e4 KC |
745 | } |
746 | ||
747 | /* Make sure we didn't get bogus platform data pointer. */ | |
748 | if (!pdata) { | |
749 | pr_err("NULL platform data\n"); | |
750 | goto fail_out; | |
751 | } | |
9ba80d99 | 752 | |
a694d1b5 | 753 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 754 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 755 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 756 | "non-zero\n"); |
9ba80d99 | 757 | goto fail_out; |
56d611a0 MS |
758 | } |
759 | ||
3bd11cf5 | 760 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 761 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 762 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 763 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 764 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 765 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
766 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
767 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 768 | |
13aefd72 MS |
769 | cxt->size = pdata->mem_size; |
770 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 771 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 772 | cxt->record_size = pdata->record_size; |
b5d38e9b | 773 | cxt->console_size = pdata->console_size; |
a694d1b5 | 774 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 775 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 776 | cxt->dump_oops = pdata->dump_oops; |
a1cf53ac | 777 | cxt->flags = pdata->flags; |
c31ad081 | 778 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 779 | |
f4c5d242 | 780 | paddr = cxt->phys_addr; |
896fc1f0 | 781 | |
9d5438f4 MS |
782 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
783 | - cxt->pmsg_size; | |
a5d23b95 | 784 | err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
785 | dump_mem_sz, cxt->record_size, |
786 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
787 | if (err) |
788 | goto fail_out; | |
789 | ||
c443a5f3 | 790 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 791 | cxt->console_size, 0); |
b5d38e9b AV |
792 | if (err) |
793 | goto fail_init_cprz; | |
794 | ||
a1cf53ac JF |
795 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
796 | ? nr_cpu_ids | |
797 | : 1; | |
c443a5f3 KC |
798 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
799 | cxt->ftrace_size, -1, | |
800 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
801 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
802 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
803 | if (err) |
804 | goto fail_init_fprz; | |
805 | ||
c443a5f3 KC |
806 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
807 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
808 | if (err) |
809 | goto fail_init_mprz; | |
810 | ||
9ba80d99 | 811 | cxt->pstore.data = cxt; |
b5d38e9b | 812 | /* |
a384f641 AV |
813 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
814 | * have to handle dumps, we must have at least record_size buffer. And | |
815 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
816 | * ZERO_SIZE_PTR). | |
b5d38e9b | 817 | */ |
a384f641 AV |
818 | if (cxt->console_size) |
819 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
820 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 | 821 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
9ba80d99 KC |
822 | if (!cxt->pstore.buf) { |
823 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 824 | err = -ENOMEM; |
9ba80d99 KC |
825 | goto fail_clear; |
826 | } | |
f88baf68 | 827 | spin_lock_init(&cxt->pstore.buf_lock); |
9ba80d99 | 828 | |
79d955af NK |
829 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; |
830 | if (cxt->console_size) | |
831 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
832 | if (cxt->ftrace_size) | |
833 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; | |
834 | if (cxt->pmsg_size) | |
835 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 836 | |
9ba80d99 | 837 | err = pstore_register(&cxt->pstore); |
56d611a0 | 838 | if (err) { |
9ba80d99 | 839 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 840 | goto fail_buf; |
56d611a0 MS |
841 | } |
842 | ||
c755201e KC |
843 | /* |
844 | * Update the module parameter variables as well so they are visible | |
845 | * through /sys/module/ramoops/parameters/ | |
846 | */ | |
847 | mem_size = pdata->mem_size; | |
848 | mem_address = pdata->mem_address; | |
849 | record_size = pdata->record_size; | |
850 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
851 | ramoops_console_size = pdata->console_size; |
852 | ramoops_pmsg_size = pdata->pmsg_size; | |
853 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 854 | |
c31ad081 | 855 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 856 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 857 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 858 | |
56d611a0 MS |
859 | return 0; |
860 | ||
9ba80d99 KC |
861 | fail_buf: |
862 | kfree(cxt->pstore.buf); | |
863 | fail_clear: | |
864 | cxt->pstore.bufsize = 0; | |
e976e564 | 865 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 866 | fail_init_mprz: |
a694d1b5 | 867 | fail_init_fprz: |
e976e564 | 868 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 869 | fail_init_cprz: |
f4c5d242 | 870 | ramoops_free_przs(cxt); |
9ba80d99 | 871 | fail_out: |
56d611a0 MS |
872 | return err; |
873 | } | |
874 | ||
ee1d2674 | 875 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
876 | { |
877 | struct ramoops_context *cxt = &oops_cxt; | |
878 | ||
ee1d2674 | 879 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 880 | |
9ba80d99 KC |
881 | kfree(cxt->pstore.buf); |
882 | cxt->pstore.bufsize = 0; | |
883 | ||
ee1d2674 | 884 | persistent_ram_free(cxt->mprz); |
ee1d2674 GT |
885 | persistent_ram_free(cxt->cprz); |
886 | ramoops_free_przs(cxt); | |
887 | ||
c3b92ce9 | 888 | return 0; |
56d611a0 MS |
889 | } |
890 | ||
35da6094 GH |
891 | static const struct of_device_id dt_match[] = { |
892 | { .compatible = "ramoops" }, | |
893 | {} | |
894 | }; | |
895 | ||
c3b92ce9 | 896 | static struct platform_driver ramoops_driver = { |
924d3711 | 897 | .probe = ramoops_probe, |
ee1d2674 | 898 | .remove = ramoops_remove, |
c3b92ce9 | 899 | .driver = { |
35da6094 GH |
900 | .name = "ramoops", |
901 | .of_match_table = dt_match, | |
c3b92ce9 KP |
902 | }, |
903 | }; | |
904 | ||
924d3711 | 905 | static void ramoops_register_dummy(void) |
c3b92ce9 | 906 | { |
924d3711 AV |
907 | if (!mem_size) |
908 | return; | |
909 | ||
910 | pr_info("using module parameters\n"); | |
911 | ||
912 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
913 | if (!dummy_data) { | |
914 | pr_info("could not allocate pdata\n"); | |
915 | return; | |
13aefd72 MS |
916 | } |
917 | ||
924d3711 AV |
918 | dummy_data->mem_size = mem_size; |
919 | dummy_data->mem_address = mem_address; | |
07855056 | 920 | dummy_data->mem_type = mem_type; |
924d3711 AV |
921 | dummy_data->record_size = record_size; |
922 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 923 | dummy_data->ftrace_size = ramoops_ftrace_size; |
9d5438f4 | 924 | dummy_data->pmsg_size = ramoops_pmsg_size; |
924d3711 | 925 | dummy_data->dump_oops = dump_oops; |
a1cf53ac JF |
926 | dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU; |
927 | ||
5ca5d4e6 AV |
928 | /* |
929 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
930 | * (using 1 byte for ECC isn't much of use anyway). | |
931 | */ | |
c31ad081 | 932 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
933 | |
934 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
935 | dummy_data, sizeof(struct ramoops_platform_data)); | |
936 | if (IS_ERR(dummy)) { | |
937 | pr_info("could not create platform device: %ld\n", | |
938 | PTR_ERR(dummy)); | |
939 | } | |
940 | } | |
941 | ||
942 | static int __init ramoops_init(void) | |
943 | { | |
944 | ramoops_register_dummy(); | |
945 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 946 | } |
924d3711 | 947 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
948 | |
949 | static void __exit ramoops_exit(void) | |
950 | { | |
951 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 952 | platform_device_unregister(dummy); |
13aefd72 | 953 | kfree(dummy_data); |
c3b92ce9 | 954 | } |
56d611a0 MS |
955 | module_exit(ramoops_exit); |
956 | ||
957 | MODULE_LICENSE("GPL"); | |
958 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
959 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |