Commit | Line | Data |
---|---|---|
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 WWNDU |
60 | static unsigned long long mem_address; |
61 | module_param(mem_address, ullong, 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 | ||
136 | if (i >= max) | |
137 | return NULL; | |
138 | ||
139 | prz = przs[i]; | |
b0aa931f LS |
140 | if (!prz) |
141 | return NULL; | |
755d66b4 | 142 | |
aa9a4a1e LS |
143 | /* Update old/shadowed buffer. */ |
144 | if (update) | |
755d66b4 | 145 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
146 | |
147 | if (!persistent_ram_old_size(prz)) | |
148 | return NULL; | |
755d66b4 AV |
149 | |
150 | *typep = type; | |
151 | *id = i; | |
152 | ||
153 | return prz; | |
154 | } | |
155 | ||
a28726b4 | 156 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
3f8f80f0 AB |
157 | bool *compressed) |
158 | { | |
159 | char data_type; | |
a28726b4 | 160 | int header_length = 0; |
3f8f80f0 | 161 | |
a28726b4 BZ |
162 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
163 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
3f8f80f0 AB |
164 | if (data_type == 'C') |
165 | *compressed = true; | |
166 | else | |
167 | *compressed = false; | |
a28726b4 BZ |
168 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
169 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
3f8f80f0 AB |
170 | *compressed = false; |
171 | } else { | |
172 | time->tv_sec = 0; | |
173 | time->tv_nsec = 0; | |
174 | *compressed = false; | |
175 | } | |
a28726b4 | 176 | return header_length; |
3f8f80f0 AB |
177 | } |
178 | ||
f44f9652 MS |
179 | static bool prz_ok(struct persistent_ram_zone *prz) |
180 | { | |
181 | return !!prz && !!(persistent_ram_old_size(prz) + | |
182 | persistent_ram_ecc_string(prz, NULL, 0)); | |
183 | } | |
184 | ||
2fbea82b JF |
185 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
186 | struct persistent_ram_zone *src) | |
187 | { | |
188 | size_t dest_size, src_size, total, dest_off, src_off; | |
189 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
190 | void *merged_buf; | |
191 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
192 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
193 | ||
194 | dest_off = dest->old_log_size % record_size; | |
195 | dest_size = dest->old_log_size - dest_off; | |
196 | ||
197 | src_off = src->old_log_size % record_size; | |
198 | src_size = src->old_log_size - src_off; | |
199 | ||
200 | total = dest_size + src_size; | |
201 | merged_buf = kmalloc(total, GFP_KERNEL); | |
202 | if (!merged_buf) | |
203 | return -ENOMEM; | |
204 | ||
205 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
206 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
207 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
208 | ||
209 | while (dest_size > 0 && src_size > 0) { | |
210 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
211 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
212 | mrec[merged_idx++] = drec[dest_idx++]; | |
213 | dest_size -= record_size; | |
214 | } else { | |
215 | mrec[merged_idx++] = srec[src_idx++]; | |
216 | src_size -= record_size; | |
217 | } | |
218 | } | |
219 | ||
220 | while (dest_size > 0) { | |
221 | mrec[merged_idx++] = drec[dest_idx++]; | |
222 | dest_size -= record_size; | |
223 | } | |
224 | ||
225 | while (src_size > 0) { | |
226 | mrec[merged_idx++] = srec[src_idx++]; | |
227 | src_size -= record_size; | |
228 | } | |
229 | ||
230 | kfree(dest->old_log); | |
231 | dest->old_log = merged_buf; | |
232 | dest->old_log_size = total; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
9ba80d99 | 237 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 | 238 | int *count, struct timespec *time, |
9a4e1398 | 239 | char **buf, bool *compressed, |
8cfc8ddc | 240 | ssize_t *ecc_notice_size, |
9a4e1398 | 241 | struct pstore_info *psi) |
56d611a0 | 242 | { |
2fbea82b | 243 | ssize_t size = 0; |
9ba80d99 | 244 | struct ramoops_context *cxt = psi->data; |
e036bd33 BZ |
245 | struct persistent_ram_zone *prz = NULL; |
246 | int header_length = 0; | |
2fbea82b | 247 | bool free_prz = false; |
e036bd33 BZ |
248 | |
249 | /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
250 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have | |
251 | * valid time stamps, so it is initialized to zero. | |
252 | */ | |
253 | time->tv_sec = 0; | |
254 | time->tv_nsec = 0; | |
255 | *compressed = false; | |
256 | ||
257 | /* Find the next valid persistent_ram_zone for DMESG */ | |
258 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
a5d23b95 | 259 | prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt, |
e036bd33 BZ |
260 | cxt->max_dump_cnt, id, type, |
261 | PSTORE_TYPE_DMESG, 1); | |
262 | if (!prz_ok(prz)) | |
263 | continue; | |
264 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
265 | time, compressed); | |
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 AV |
275 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
276 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
2fbea82b JF |
277 | |
278 | if (!prz_ok(prz)) | |
279 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, | |
280 | 1, id, type, PSTORE_TYPE_PMSG, 0); | |
281 | ||
282 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
a1cf53ac | 283 | if (!prz_ok(prz)) { |
2fbea82b | 284 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) { |
a1cf53ac | 285 | prz = ramoops_get_next_prz(cxt->fprzs, |
2fbea82b | 286 | &cxt->ftrace_read_cnt, 1, id, type, |
a1cf53ac | 287 | PSTORE_TYPE_FTRACE, 0); |
2fbea82b JF |
288 | } else { |
289 | /* | |
290 | * Build a new dummy record which combines all the | |
291 | * per-cpu records including metadata and ecc info. | |
292 | */ | |
293 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
294 | ||
295 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
296 | GFP_KERNEL); | |
297 | if (!tmp_prz) | |
298 | return -ENOMEM; | |
299 | free_prz = true; | |
300 | ||
301 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
302 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
303 | &cxt->ftrace_read_cnt, | |
304 | cxt->max_ftrace_cnt, id, | |
305 | type, PSTORE_TYPE_FTRACE, 0); | |
306 | ||
307 | if (!prz_ok(prz_next)) | |
308 | continue; | |
309 | ||
310 | tmp_prz->ecc_info = prz_next->ecc_info; | |
311 | tmp_prz->corrected_bytes += | |
312 | prz_next->corrected_bytes; | |
313 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
314 | size = ftrace_log_combine(tmp_prz, prz_next); | |
315 | if (size) | |
316 | goto out; | |
317 | } | |
318 | *id = 0; | |
319 | prz = tmp_prz; | |
a1cf53ac JF |
320 | } |
321 | } | |
322 | ||
2fbea82b JF |
323 | if (!prz_ok(prz)) { |
324 | size = 0; | |
325 | goto out; | |
326 | } | |
896fc1f0 | 327 | |
e036bd33 | 328 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
329 | |
330 | /* ECC correction notice */ | |
8cfc8ddc | 331 | *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 332 | |
8cfc8ddc | 333 | *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL); |
2fbea82b JF |
334 | if (*buf == NULL) { |
335 | size = -ENOMEM; | |
336 | goto out; | |
337 | } | |
9ba80d99 | 338 | |
a28726b4 | 339 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); |
2fbea82b | 340 | |
8cfc8ddc | 341 | persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1); |
bd08ec33 | 342 | |
2fbea82b JF |
343 | out: |
344 | if (free_prz) { | |
345 | kfree(prz->old_log); | |
346 | kfree(prz); | |
347 | } | |
348 | ||
8cfc8ddc | 349 | return size; |
9ba80d99 KC |
350 | } |
351 | ||
3f8f80f0 AB |
352 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
353 | bool compressed) | |
896fc1f0 AV |
354 | { |
355 | char *hdr; | |
1e817fb6 | 356 | struct timespec timestamp; |
896fc1f0 AV |
357 | size_t len; |
358 | ||
1e817fb6 KC |
359 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
360 | if (__getnstimeofday(×tamp)) { | |
361 | timestamp.tv_sec = 0; | |
362 | timestamp.tv_nsec = 0; | |
363 | } | |
3f8f80f0 AB |
364 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
365 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
366 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
367 | WARN_ON_ONCE(!hdr); |
368 | len = hdr ? strlen(hdr) : 0; | |
369 | persistent_ram_write(prz, hdr, len); | |
370 | kfree(hdr); | |
371 | ||
372 | return len; | |
373 | } | |
374 | ||
24203036 AV |
375 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
376 | enum kmsg_dump_reason reason, | |
377 | u64 *id, unsigned int part, | |
6bbbca73 | 378 | const char *buf, |
b3b515bb | 379 | bool compressed, size_t size, |
24203036 | 380 | struct pstore_info *psi) |
9ba80d99 | 381 | { |
9ba80d99 | 382 | struct ramoops_context *cxt = psi->data; |
c6289378 | 383 | struct persistent_ram_zone *prz; |
896fc1f0 | 384 | size_t hlen; |
9ba80d99 | 385 | |
b5d38e9b AV |
386 | if (type == PSTORE_TYPE_CONSOLE) { |
387 | if (!cxt->cprz) | |
388 | return -ENOMEM; | |
c2b71132 | 389 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 390 | return 0; |
a694d1b5 | 391 | } else if (type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
392 | int zonenum; |
393 | ||
394 | if (!cxt->fprzs) | |
a694d1b5 | 395 | return -ENOMEM; |
a1cf53ac JF |
396 | /* |
397 | * Choose zone by if we're using per-cpu buffers. | |
398 | */ | |
399 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
400 | zonenum = smp_processor_id(); | |
401 | else | |
402 | zonenum = 0; | |
403 | ||
404 | persistent_ram_write(cxt->fprzs[zonenum], buf, size); | |
a694d1b5 | 405 | return 0; |
9d5438f4 | 406 | } else if (type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
407 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
408 | return -EINVAL; | |
b5d38e9b AV |
409 | } |
410 | ||
9ba80d99 KC |
411 | if (type != PSTORE_TYPE_DMESG) |
412 | return -EINVAL; | |
56d611a0 | 413 | |
9ba80d99 KC |
414 | /* Out of the various dmesg dump types, ramoops is currently designed |
415 | * to only store crash logs, rather than storing general kernel logs. | |
416 | */ | |
fc2d557c | 417 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 418 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 419 | return -EINVAL; |
fc2d557c | 420 | |
9ba80d99 | 421 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 422 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
423 | return -EINVAL; |
424 | ||
425 | /* Explicitly only take the first part of any new crash. | |
426 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
427 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
428 | * report split across multiple records. | |
429 | */ | |
430 | if (part != 1) | |
431 | return -ENOSPC; | |
56d611a0 | 432 | |
a5d23b95 | 433 | if (!cxt->dprzs) |
c6289378 AH |
434 | return -ENOSPC; |
435 | ||
a5d23b95 | 436 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 437 | |
3f8f80f0 | 438 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
896fc1f0 AV |
439 | if (size + hlen > prz->buffer_size) |
440 | size = prz->buffer_size - hlen; | |
c2b71132 | 441 | persistent_ram_write(prz, buf, size); |
56d611a0 | 442 | |
cac2eb7b | 443 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
444 | |
445 | return 0; | |
446 | } | |
447 | ||
5bf6d1b9 MS |
448 | static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type, |
449 | enum kmsg_dump_reason reason, | |
450 | u64 *id, unsigned int part, | |
451 | const char __user *buf, | |
452 | bool compressed, size_t size, | |
453 | struct pstore_info *psi) | |
454 | { | |
455 | if (type == PSTORE_TYPE_PMSG) { | |
456 | struct ramoops_context *cxt = psi->data; | |
457 | ||
458 | if (!cxt->mprz) | |
459 | return -ENOMEM; | |
460 | return persistent_ram_write_user(cxt->mprz, buf, size); | |
461 | } | |
462 | ||
463 | return -EINVAL; | |
464 | } | |
465 | ||
755d4fe4 | 466 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 467 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 468 | { |
9ba80d99 | 469 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 470 | struct persistent_ram_zone *prz; |
9ba80d99 | 471 | |
b5d38e9b AV |
472 | switch (type) { |
473 | case PSTORE_TYPE_DMESG: | |
474 | if (id >= cxt->max_dump_cnt) | |
475 | return -EINVAL; | |
a5d23b95 | 476 | prz = cxt->dprzs[id]; |
b5d38e9b AV |
477 | break; |
478 | case PSTORE_TYPE_CONSOLE: | |
479 | prz = cxt->cprz; | |
480 | break; | |
a694d1b5 | 481 | case PSTORE_TYPE_FTRACE: |
a1cf53ac JF |
482 | if (id >= cxt->max_ftrace_cnt) |
483 | return -EINVAL; | |
484 | prz = cxt->fprzs[id]; | |
a694d1b5 | 485 | break; |
9d5438f4 MS |
486 | case PSTORE_TYPE_PMSG: |
487 | prz = cxt->mprz; | |
488 | break; | |
b5d38e9b | 489 | default: |
9ba80d99 | 490 | return -EINVAL; |
b5d38e9b | 491 | } |
9ba80d99 | 492 | |
b5d38e9b AV |
493 | persistent_ram_free_old(prz); |
494 | persistent_ram_zap(prz); | |
9ba80d99 KC |
495 | |
496 | return 0; | |
56d611a0 MS |
497 | } |
498 | ||
9ba80d99 KC |
499 | static struct ramoops_context oops_cxt = { |
500 | .pstore = { | |
501 | .owner = THIS_MODULE, | |
502 | .name = "ramoops", | |
503 | .open = ramoops_pstore_open, | |
504 | .read = ramoops_pstore_read, | |
c2b71132 | 505 | .write_buf = ramoops_pstore_write_buf, |
5bf6d1b9 | 506 | .write_buf_user = ramoops_pstore_write_buf_user, |
9ba80d99 KC |
507 | .erase = ramoops_pstore_erase, |
508 | }, | |
509 | }; | |
510 | ||
f4c5d242 AV |
511 | static void ramoops_free_przs(struct ramoops_context *cxt) |
512 | { | |
513 | int i; | |
514 | ||
a1cf53ac | 515 | /* Free dump PRZs */ |
a5d23b95 | 516 | if (cxt->dprzs) { |
a1cf53ac | 517 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 518 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 519 | |
a5d23b95 | 520 | kfree(cxt->dprzs); |
a1cf53ac JF |
521 | cxt->max_dump_cnt = 0; |
522 | } | |
4407de74 | 523 | |
a1cf53ac JF |
524 | /* Free ftrace PRZs */ |
525 | if (cxt->fprzs) { | |
526 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
527 | persistent_ram_free(cxt->fprzs[i]); | |
528 | kfree(cxt->fprzs); | |
529 | cxt->max_ftrace_cnt = 0; | |
530 | } | |
f4c5d242 AV |
531 | } |
532 | ||
c443a5f3 KC |
533 | static int ramoops_init_przs(const char *name, |
534 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
535 | struct persistent_ram_zone ***przs, |
536 | phys_addr_t *paddr, size_t mem_sz, | |
537 | ssize_t record_size, | |
538 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
539 | { |
540 | int err = -ENOMEM; | |
541 | int i; | |
de832092 KC |
542 | size_t zone_sz; |
543 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 544 | |
de832092 KC |
545 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
546 | if (mem_sz == 0 || record_size == 0) { | |
547 | *cnt = 0; | |
f4c5d242 | 548 | return 0; |
c6289378 AH |
549 | } |
550 | ||
de832092 KC |
551 | /* |
552 | * If we have a negative record size, calculate it based on | |
553 | * mem_sz / *cnt. If we have a positive record size, calculate | |
554 | * cnt from mem_sz / record_size. | |
555 | */ | |
556 | if (record_size < 0) { | |
557 | if (*cnt == 0) | |
558 | return 0; | |
559 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
560 | if (record_size == 0) { |
561 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
562 | name, mem_sz, *cnt); | |
de832092 | 563 | goto fail; |
c443a5f3 | 564 | } |
de832092 KC |
565 | } else { |
566 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
567 | if (*cnt == 0) { |
568 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
569 | name, mem_sz, record_size); | |
de832092 | 570 | goto fail; |
c443a5f3 | 571 | } |
de832092 | 572 | } |
f4c5d242 | 573 | |
de832092 | 574 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
575 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
576 | name, | |
de832092 KC |
577 | mem_sz, (unsigned long long)*paddr, |
578 | cxt->size, (unsigned long long)cxt->phys_addr); | |
579 | goto fail; | |
f4c5d242 AV |
580 | } |
581 | ||
de832092 | 582 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
583 | if (!zone_sz) { |
584 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 585 | goto fail; |
c443a5f3 | 586 | } |
de832092 KC |
587 | |
588 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
589 | if (!prz_ar) | |
590 | goto fail; | |
591 | ||
592 | for (i = 0; i < *cnt; i++) { | |
593 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, | |
027bc8b0 | 594 | &cxt->ecc_info, |
de832092 KC |
595 | cxt->memtype, flags); |
596 | if (IS_ERR(prz_ar[i])) { | |
597 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
598 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
599 | name, record_size, | |
600 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
601 | |
602 | while (i > 0) { | |
603 | i--; | |
de832092 | 604 | persistent_ram_free(prz_ar[i]); |
4407de74 | 605 | } |
de832092 KC |
606 | kfree(prz_ar); |
607 | goto fail; | |
f4c5d242 | 608 | } |
de832092 | 609 | *paddr += zone_sz; |
f4c5d242 AV |
610 | } |
611 | ||
de832092 | 612 | *przs = prz_ar; |
f4c5d242 | 613 | return 0; |
de832092 KC |
614 | |
615 | fail: | |
616 | *cnt = 0; | |
f4c5d242 AV |
617 | return err; |
618 | } | |
619 | ||
c443a5f3 KC |
620 | static int ramoops_init_prz(const char *name, |
621 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
622 | struct persistent_ram_zone **prz, |
623 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
624 | { |
625 | if (!sz) | |
626 | return 0; | |
627 | ||
c6289378 | 628 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
629 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
630 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 631 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 632 | return -ENOMEM; |
c6289378 | 633 | } |
b5d38e9b | 634 | |
663deb47 JF |
635 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
636 | cxt->memtype, 0); | |
b5d38e9b AV |
637 | if (IS_ERR(*prz)) { |
638 | int err = PTR_ERR(*prz); | |
639 | ||
c443a5f3 KC |
640 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
641 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
642 | return err; |
643 | } | |
644 | ||
645 | persistent_ram_zap(*prz); | |
646 | ||
647 | *paddr += sz; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
35da6094 GH |
652 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
653 | const char *propname, u32 *value) | |
654 | { | |
655 | u32 val32 = 0; | |
656 | int ret; | |
657 | ||
658 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
659 | if (ret < 0 && ret != -EINVAL) { | |
660 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
661 | propname, ret); | |
662 | return ret; | |
663 | } | |
664 | ||
665 | if (val32 > INT_MAX) { | |
666 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
667 | return -EOVERFLOW; | |
668 | } | |
669 | ||
670 | *value = val32; | |
671 | return 0; | |
672 | } | |
673 | ||
674 | static int ramoops_parse_dt(struct platform_device *pdev, | |
675 | struct ramoops_platform_data *pdata) | |
676 | { | |
677 | struct device_node *of_node = pdev->dev.of_node; | |
529182e2 | 678 | struct resource *res; |
35da6094 GH |
679 | u32 value; |
680 | int ret; | |
681 | ||
682 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
683 | ||
529182e2 KC |
684 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
685 | if (!res) { | |
35da6094 | 686 | dev_err(&pdev->dev, |
529182e2 KC |
687 | "failed to locate DT /reserved-memory resource\n"); |
688 | return -EINVAL; | |
35da6094 GH |
689 | } |
690 | ||
529182e2 KC |
691 | pdata->mem_size = resource_size(res); |
692 | pdata->mem_address = res->start; | |
35da6094 GH |
693 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
694 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
695 | ||
696 | #define parse_size(name, field) { \ | |
697 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
698 | if (ret < 0) \ | |
699 | return ret; \ | |
700 | field = value; \ | |
701 | } | |
702 | ||
703 | parse_size("record-size", pdata->record_size); | |
704 | parse_size("console-size", pdata->console_size); | |
705 | parse_size("ftrace-size", pdata->ftrace_size); | |
706 | parse_size("pmsg-size", pdata->pmsg_size); | |
707 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
a1cf53ac | 708 | parse_size("flags", pdata->flags); |
35da6094 GH |
709 | |
710 | #undef parse_size | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
f568f6ca | 715 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 716 | { |
896fc1f0 | 717 | struct device *dev = &pdev->dev; |
35da6094 | 718 | struct ramoops_platform_data *pdata = dev->platform_data; |
56d611a0 | 719 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
720 | size_t dump_mem_sz; |
721 | phys_addr_t paddr; | |
56d611a0 MS |
722 | int err = -EINVAL; |
723 | ||
35da6094 GH |
724 | if (dev_of_node(dev) && !pdata) { |
725 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
726 | if (!pdata) { | |
c443a5f3 | 727 | pr_err("cannot allocate platform data buffer\n"); |
35da6094 GH |
728 | err = -ENOMEM; |
729 | goto fail_out; | |
730 | } | |
731 | ||
732 | err = ramoops_parse_dt(pdev, pdata); | |
733 | if (err < 0) | |
734 | goto fail_out; | |
735 | } | |
736 | ||
fc46d4e4 KC |
737 | /* |
738 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
739 | * probes. |
740 | */ | |
fc46d4e4 KC |
741 | if (cxt->max_dump_cnt) { |
742 | pr_err("already initialized\n"); | |
9ba80d99 | 743 | goto fail_out; |
fc46d4e4 KC |
744 | } |
745 | ||
746 | /* Make sure we didn't get bogus platform data pointer. */ | |
747 | if (!pdata) { | |
748 | pr_err("NULL platform data\n"); | |
749 | goto fail_out; | |
750 | } | |
9ba80d99 | 751 | |
a694d1b5 | 752 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 753 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 754 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 755 | "non-zero\n"); |
9ba80d99 | 756 | goto fail_out; |
56d611a0 MS |
757 | } |
758 | ||
3bd11cf5 | 759 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 760 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 761 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 762 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 763 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 764 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
765 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
766 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 767 | |
13aefd72 MS |
768 | cxt->size = pdata->mem_size; |
769 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 770 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 771 | cxt->record_size = pdata->record_size; |
b5d38e9b | 772 | cxt->console_size = pdata->console_size; |
a694d1b5 | 773 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 774 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 775 | cxt->dump_oops = pdata->dump_oops; |
a1cf53ac | 776 | cxt->flags = pdata->flags; |
c31ad081 | 777 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 778 | |
f4c5d242 | 779 | paddr = cxt->phys_addr; |
896fc1f0 | 780 | |
9d5438f4 MS |
781 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
782 | - cxt->pmsg_size; | |
a5d23b95 | 783 | err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
784 | dump_mem_sz, cxt->record_size, |
785 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
786 | if (err) |
787 | goto fail_out; | |
788 | ||
c443a5f3 | 789 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 790 | cxt->console_size, 0); |
b5d38e9b AV |
791 | if (err) |
792 | goto fail_init_cprz; | |
793 | ||
a1cf53ac JF |
794 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
795 | ? nr_cpu_ids | |
796 | : 1; | |
c443a5f3 KC |
797 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
798 | cxt->ftrace_size, -1, | |
799 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
800 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
801 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
802 | if (err) |
803 | goto fail_init_fprz; | |
804 | ||
c443a5f3 KC |
805 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
806 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
807 | if (err) |
808 | goto fail_init_mprz; | |
809 | ||
9ba80d99 | 810 | cxt->pstore.data = cxt; |
b5d38e9b | 811 | /* |
a384f641 AV |
812 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
813 | * have to handle dumps, we must have at least record_size buffer. And | |
814 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
815 | * ZERO_SIZE_PTR). | |
b5d38e9b | 816 | */ |
a384f641 AV |
817 | if (cxt->console_size) |
818 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
819 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 | 820 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
9ba80d99 KC |
821 | if (!cxt->pstore.buf) { |
822 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 823 | err = -ENOMEM; |
9ba80d99 KC |
824 | goto fail_clear; |
825 | } | |
f88baf68 | 826 | spin_lock_init(&cxt->pstore.buf_lock); |
9ba80d99 | 827 | |
79d955af NK |
828 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; |
829 | if (cxt->console_size) | |
830 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
831 | if (cxt->ftrace_size) | |
832 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; | |
833 | if (cxt->pmsg_size) | |
834 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 835 | |
9ba80d99 | 836 | err = pstore_register(&cxt->pstore); |
56d611a0 | 837 | if (err) { |
9ba80d99 | 838 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 839 | goto fail_buf; |
56d611a0 MS |
840 | } |
841 | ||
c755201e KC |
842 | /* |
843 | * Update the module parameter variables as well so they are visible | |
844 | * through /sys/module/ramoops/parameters/ | |
845 | */ | |
846 | mem_size = pdata->mem_size; | |
847 | mem_address = pdata->mem_address; | |
848 | record_size = pdata->record_size; | |
849 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
850 | ramoops_console_size = pdata->console_size; |
851 | ramoops_pmsg_size = pdata->pmsg_size; | |
852 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 853 | |
c31ad081 | 854 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 855 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 856 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 857 | |
56d611a0 MS |
858 | return 0; |
859 | ||
9ba80d99 KC |
860 | fail_buf: |
861 | kfree(cxt->pstore.buf); | |
862 | fail_clear: | |
863 | cxt->pstore.bufsize = 0; | |
e976e564 | 864 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 865 | fail_init_mprz: |
a694d1b5 | 866 | fail_init_fprz: |
e976e564 | 867 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 868 | fail_init_cprz: |
f4c5d242 | 869 | ramoops_free_przs(cxt); |
9ba80d99 | 870 | fail_out: |
56d611a0 MS |
871 | return err; |
872 | } | |
873 | ||
ee1d2674 | 874 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
875 | { |
876 | struct ramoops_context *cxt = &oops_cxt; | |
877 | ||
ee1d2674 | 878 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 879 | |
9ba80d99 KC |
880 | kfree(cxt->pstore.buf); |
881 | cxt->pstore.bufsize = 0; | |
882 | ||
ee1d2674 | 883 | persistent_ram_free(cxt->mprz); |
ee1d2674 GT |
884 | persistent_ram_free(cxt->cprz); |
885 | ramoops_free_przs(cxt); | |
886 | ||
c3b92ce9 | 887 | return 0; |
56d611a0 MS |
888 | } |
889 | ||
35da6094 GH |
890 | static const struct of_device_id dt_match[] = { |
891 | { .compatible = "ramoops" }, | |
892 | {} | |
893 | }; | |
894 | ||
c3b92ce9 | 895 | static struct platform_driver ramoops_driver = { |
924d3711 | 896 | .probe = ramoops_probe, |
ee1d2674 | 897 | .remove = ramoops_remove, |
c3b92ce9 | 898 | .driver = { |
35da6094 GH |
899 | .name = "ramoops", |
900 | .of_match_table = dt_match, | |
c3b92ce9 KP |
901 | }, |
902 | }; | |
903 | ||
924d3711 | 904 | static void ramoops_register_dummy(void) |
c3b92ce9 | 905 | { |
924d3711 AV |
906 | if (!mem_size) |
907 | return; | |
908 | ||
909 | pr_info("using module parameters\n"); | |
910 | ||
911 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
912 | if (!dummy_data) { | |
913 | pr_info("could not allocate pdata\n"); | |
914 | return; | |
13aefd72 MS |
915 | } |
916 | ||
924d3711 AV |
917 | dummy_data->mem_size = mem_size; |
918 | dummy_data->mem_address = mem_address; | |
07855056 | 919 | dummy_data->mem_type = mem_type; |
924d3711 AV |
920 | dummy_data->record_size = record_size; |
921 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 922 | dummy_data->ftrace_size = ramoops_ftrace_size; |
9d5438f4 | 923 | dummy_data->pmsg_size = ramoops_pmsg_size; |
924d3711 | 924 | dummy_data->dump_oops = dump_oops; |
a1cf53ac JF |
925 | dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU; |
926 | ||
5ca5d4e6 AV |
927 | /* |
928 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
929 | * (using 1 byte for ECC isn't much of use anyway). | |
930 | */ | |
c31ad081 | 931 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
932 | |
933 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
934 | dummy_data, sizeof(struct ramoops_platform_data)); | |
935 | if (IS_ERR(dummy)) { | |
936 | pr_info("could not create platform device: %ld\n", | |
937 | PTR_ERR(dummy)); | |
938 | } | |
939 | } | |
940 | ||
941 | static int __init ramoops_init(void) | |
942 | { | |
943 | ramoops_register_dummy(); | |
944 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 945 | } |
924d3711 | 946 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
947 | |
948 | static void __exit ramoops_exit(void) | |
949 | { | |
950 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 951 | platform_device_unregister(dummy); |
13aefd72 | 952 | kfree(dummy_data); |
c3b92ce9 | 953 | } |
56d611a0 MS |
954 | module_exit(ramoops_exit); |
955 | ||
956 | MODULE_LICENSE("GPL"); | |
957 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
958 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |