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> |
1894a253 | 35 | #include <linux/pstore_ram.h> |
56d611a0 MS |
36 | |
37 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 38 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 39 | |
3e5c4fad SI |
40 | static ulong record_size = MIN_MEM_SIZE; |
41 | module_param(record_size, ulong, 0400); | |
42 | MODULE_PARM_DESC(record_size, | |
43 | "size of each dump done on oops/panic"); | |
56d611a0 | 44 | |
b5d38e9b AV |
45 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
46 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
47 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
48 | ||
a694d1b5 AV |
49 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
50 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
51 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
52 | ||
56d611a0 MS |
53 | static ulong mem_address; |
54 | module_param(mem_address, ulong, 0400); | |
55 | MODULE_PARM_DESC(mem_address, | |
56 | "start of reserved RAM used to store oops/panic logs"); | |
57 | ||
58 | static ulong mem_size; | |
59 | module_param(mem_size, ulong, 0400); | |
60 | MODULE_PARM_DESC(mem_size, | |
61 | "size of reserved RAM used to store oops/panic logs"); | |
62 | ||
63 | static int dump_oops = 1; | |
64 | module_param(dump_oops, int, 0600); | |
65 | MODULE_PARM_DESC(dump_oops, | |
66 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
67 | ||
39eb7e97 AV |
68 | static int ramoops_ecc; |
69 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
70 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
71 | "if non-zero, the option enables ECC support and specifies " |
72 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
73 | "bytes ECC)"); | |
39eb7e97 | 74 | |
9ba80d99 | 75 | struct ramoops_context { |
896fc1f0 | 76 | struct persistent_ram_zone **przs; |
b5d38e9b | 77 | struct persistent_ram_zone *cprz; |
a694d1b5 | 78 | struct persistent_ram_zone *fprz; |
56d611a0 MS |
79 | phys_addr_t phys_addr; |
80 | unsigned long size; | |
9ba80d99 | 81 | size_t record_size; |
b5d38e9b | 82 | size_t console_size; |
a694d1b5 | 83 | size_t ftrace_size; |
6b4d2a27 | 84 | int dump_oops; |
5ca5d4e6 | 85 | int ecc_size; |
cac2eb7b AV |
86 | unsigned int max_dump_cnt; |
87 | unsigned int dump_write_cnt; | |
88 | unsigned int dump_read_cnt; | |
b5d38e9b | 89 | unsigned int console_read_cnt; |
a694d1b5 | 90 | unsigned int ftrace_read_cnt; |
9ba80d99 KC |
91 | struct pstore_info pstore; |
92 | }; | |
56d611a0 | 93 | |
13aefd72 MS |
94 | static struct platform_device *dummy; |
95 | static struct ramoops_platform_data *dummy_data; | |
96 | ||
9ba80d99 KC |
97 | static int ramoops_pstore_open(struct pstore_info *psi) |
98 | { | |
99 | struct ramoops_context *cxt = psi->data; | |
100 | ||
cac2eb7b | 101 | cxt->dump_read_cnt = 0; |
b5d38e9b | 102 | cxt->console_read_cnt = 0; |
9ba80d99 KC |
103 | return 0; |
104 | } | |
105 | ||
755d66b4 AV |
106 | static struct persistent_ram_zone * |
107 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
108 | u64 *id, | |
109 | enum pstore_type_id *typep, enum pstore_type_id type, | |
110 | bool update) | |
111 | { | |
112 | struct persistent_ram_zone *prz; | |
113 | int i = (*c)++; | |
114 | ||
115 | if (i >= max) | |
116 | return NULL; | |
117 | ||
118 | prz = przs[i]; | |
119 | ||
120 | if (update) { | |
121 | /* Update old/shadowed buffer. */ | |
122 | persistent_ram_save_old(prz); | |
123 | if (!persistent_ram_old_size(prz)) | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | *typep = type; | |
128 | *id = i; | |
129 | ||
130 | return prz; | |
131 | } | |
132 | ||
9ba80d99 KC |
133 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
134 | struct timespec *time, | |
135 | char **buf, | |
136 | struct pstore_info *psi) | |
56d611a0 | 137 | { |
9ba80d99 | 138 | ssize_t size; |
9ba80d99 | 139 | struct ramoops_context *cxt = psi->data; |
896fc1f0 | 140 | struct persistent_ram_zone *prz; |
9ba80d99 | 141 | |
755d66b4 AV |
142 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, |
143 | cxt->max_dump_cnt, id, type, | |
144 | PSTORE_TYPE_DMESG, 1); | |
b5d38e9b AV |
145 | if (!prz) |
146 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, | |
147 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
a694d1b5 AV |
148 | if (!prz) |
149 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, | |
150 | 1, id, type, PSTORE_TYPE_FTRACE, 0); | |
755d66b4 AV |
151 | if (!prz) |
152 | return 0; | |
896fc1f0 | 153 | |
9ba80d99 KC |
154 | /* TODO(kees): Bogus time for the moment. */ |
155 | time->tv_sec = 0; | |
156 | time->tv_nsec = 0; | |
157 | ||
896fc1f0 | 158 | size = persistent_ram_old_size(prz); |
9ba80d99 KC |
159 | *buf = kmalloc(size, GFP_KERNEL); |
160 | if (*buf == NULL) | |
161 | return -ENOMEM; | |
896fc1f0 | 162 | memcpy(*buf, persistent_ram_old(prz), size); |
9ba80d99 KC |
163 | |
164 | return size; | |
165 | } | |
166 | ||
896fc1f0 AV |
167 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz) |
168 | { | |
169 | char *hdr; | |
170 | struct timeval timestamp; | |
171 | size_t len; | |
172 | ||
173 | do_gettimeofday(×tamp); | |
174 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n", | |
175 | (long)timestamp.tv_sec, (long)timestamp.tv_usec); | |
176 | WARN_ON_ONCE(!hdr); | |
177 | len = hdr ? strlen(hdr) : 0; | |
178 | persistent_ram_write(prz, hdr, len); | |
179 | kfree(hdr); | |
180 | ||
181 | return len; | |
182 | } | |
183 | ||
c2b71132 AV |
184 | |
185 | static int ramoops_pstore_write_buf(enum pstore_type_id type, | |
186 | enum kmsg_dump_reason reason, | |
187 | u64 *id, unsigned int part, | |
188 | const char *buf, size_t size, | |
189 | struct pstore_info *psi) | |
9ba80d99 | 190 | { |
9ba80d99 | 191 | struct ramoops_context *cxt = psi->data; |
cac2eb7b | 192 | struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt]; |
896fc1f0 | 193 | size_t hlen; |
9ba80d99 | 194 | |
b5d38e9b AV |
195 | if (type == PSTORE_TYPE_CONSOLE) { |
196 | if (!cxt->cprz) | |
197 | return -ENOMEM; | |
c2b71132 | 198 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 199 | return 0; |
a694d1b5 AV |
200 | } else if (type == PSTORE_TYPE_FTRACE) { |
201 | if (!cxt->fprz) | |
202 | return -ENOMEM; | |
203 | persistent_ram_write(cxt->fprz, buf, size); | |
204 | return 0; | |
b5d38e9b AV |
205 | } |
206 | ||
9ba80d99 KC |
207 | if (type != PSTORE_TYPE_DMESG) |
208 | return -EINVAL; | |
56d611a0 | 209 | |
9ba80d99 KC |
210 | /* Out of the various dmesg dump types, ramoops is currently designed |
211 | * to only store crash logs, rather than storing general kernel logs. | |
212 | */ | |
fc2d557c | 213 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 214 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 215 | return -EINVAL; |
fc2d557c | 216 | |
9ba80d99 | 217 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 218 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
219 | return -EINVAL; |
220 | ||
221 | /* Explicitly only take the first part of any new crash. | |
222 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
223 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
224 | * report split across multiple records. | |
225 | */ | |
226 | if (part != 1) | |
227 | return -ENOSPC; | |
56d611a0 | 228 | |
896fc1f0 AV |
229 | hlen = ramoops_write_kmsg_hdr(prz); |
230 | if (size + hlen > prz->buffer_size) | |
231 | size = prz->buffer_size - hlen; | |
c2b71132 | 232 | persistent_ram_write(prz, buf, size); |
56d611a0 | 233 | |
cac2eb7b | 234 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
235 | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, | |
240 | struct pstore_info *psi) | |
241 | { | |
9ba80d99 | 242 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 243 | struct persistent_ram_zone *prz; |
9ba80d99 | 244 | |
b5d38e9b AV |
245 | switch (type) { |
246 | case PSTORE_TYPE_DMESG: | |
247 | if (id >= cxt->max_dump_cnt) | |
248 | return -EINVAL; | |
249 | prz = cxt->przs[id]; | |
250 | break; | |
251 | case PSTORE_TYPE_CONSOLE: | |
252 | prz = cxt->cprz; | |
253 | break; | |
a694d1b5 AV |
254 | case PSTORE_TYPE_FTRACE: |
255 | prz = cxt->fprz; | |
256 | break; | |
b5d38e9b | 257 | default: |
9ba80d99 | 258 | return -EINVAL; |
b5d38e9b | 259 | } |
9ba80d99 | 260 | |
b5d38e9b AV |
261 | persistent_ram_free_old(prz); |
262 | persistent_ram_zap(prz); | |
9ba80d99 KC |
263 | |
264 | return 0; | |
56d611a0 MS |
265 | } |
266 | ||
9ba80d99 KC |
267 | static struct ramoops_context oops_cxt = { |
268 | .pstore = { | |
269 | .owner = THIS_MODULE, | |
270 | .name = "ramoops", | |
271 | .open = ramoops_pstore_open, | |
272 | .read = ramoops_pstore_read, | |
c2b71132 | 273 | .write_buf = ramoops_pstore_write_buf, |
9ba80d99 KC |
274 | .erase = ramoops_pstore_erase, |
275 | }, | |
276 | }; | |
277 | ||
f4c5d242 AV |
278 | static void ramoops_free_przs(struct ramoops_context *cxt) |
279 | { | |
280 | int i; | |
281 | ||
282 | if (!cxt->przs) | |
283 | return; | |
284 | ||
90b58d96 | 285 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
286 | persistent_ram_free(cxt->przs[i]); |
287 | kfree(cxt->przs); | |
288 | } | |
289 | ||
290 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, | |
291 | phys_addr_t *paddr, size_t dump_mem_sz) | |
292 | { | |
293 | int err = -ENOMEM; | |
294 | int i; | |
295 | ||
296 | if (!cxt->record_size) | |
297 | return 0; | |
298 | ||
299 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; | |
300 | if (!cxt->max_dump_cnt) | |
301 | return -ENOMEM; | |
302 | ||
303 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
304 | GFP_KERNEL); | |
305 | if (!cxt->przs) { | |
306 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
307 | return -ENOMEM; | |
308 | } | |
309 | ||
310 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
311 | size_t sz = cxt->record_size; | |
312 | ||
cbe7cbf5 | 313 | cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, cxt->ecc_size); |
f4c5d242 AV |
314 | if (IS_ERR(cxt->przs[i])) { |
315 | err = PTR_ERR(cxt->przs[i]); | |
316 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
317 | sz, (unsigned long long)*paddr, err); | |
318 | goto fail_prz; | |
319 | } | |
320 | *paddr += sz; | |
321 | } | |
322 | ||
323 | return 0; | |
324 | fail_prz: | |
325 | ramoops_free_przs(cxt); | |
326 | return err; | |
327 | } | |
328 | ||
b5d38e9b AV |
329 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
330 | struct persistent_ram_zone **prz, | |
cbe7cbf5 | 331 | phys_addr_t *paddr, size_t sz, u32 sig) |
b5d38e9b AV |
332 | { |
333 | if (!sz) | |
334 | return 0; | |
335 | ||
336 | if (*paddr + sz > *paddr + cxt->size) | |
337 | return -ENOMEM; | |
338 | ||
cbe7cbf5 | 339 | *prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size); |
b5d38e9b AV |
340 | if (IS_ERR(*prz)) { |
341 | int err = PTR_ERR(*prz); | |
342 | ||
343 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
344 | sz, (unsigned long long)*paddr, err); | |
345 | return err; | |
346 | } | |
347 | ||
348 | persistent_ram_zap(*prz); | |
349 | ||
350 | *paddr += sz; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
924d3711 | 355 | static int __devinit ramoops_probe(struct platform_device *pdev) |
56d611a0 | 356 | { |
896fc1f0 | 357 | struct device *dev = &pdev->dev; |
c3b92ce9 | 358 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 | 359 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
360 | size_t dump_mem_sz; |
361 | phys_addr_t paddr; | |
56d611a0 MS |
362 | int err = -EINVAL; |
363 | ||
9ba80d99 KC |
364 | /* Only a single ramoops area allowed at a time, so fail extra |
365 | * probes. | |
366 | */ | |
cac2eb7b | 367 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
368 | goto fail_out; |
369 | ||
a694d1b5 AV |
370 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
371 | !pdata->ftrace_size)) { | |
b5d38e9b | 372 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 373 | "non-zero\n"); |
9ba80d99 | 374 | goto fail_out; |
56d611a0 MS |
375 | } |
376 | ||
fdb59507 MS |
377 | pdata->mem_size = rounddown_pow_of_two(pdata->mem_size); |
378 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); | |
b5d38e9b | 379 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
a694d1b5 | 380 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
56d611a0 | 381 | |
cac2eb7b | 382 | cxt->dump_read_cnt = 0; |
13aefd72 MS |
383 | cxt->size = pdata->mem_size; |
384 | cxt->phys_addr = pdata->mem_address; | |
3e5c4fad | 385 | cxt->record_size = pdata->record_size; |
b5d38e9b | 386 | cxt->console_size = pdata->console_size; |
a694d1b5 | 387 | cxt->ftrace_size = pdata->ftrace_size; |
6b4d2a27 | 388 | cxt->dump_oops = pdata->dump_oops; |
5ca5d4e6 | 389 | cxt->ecc_size = pdata->ecc_size; |
56d611a0 | 390 | |
f4c5d242 | 391 | paddr = cxt->phys_addr; |
896fc1f0 | 392 | |
a694d1b5 | 393 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size; |
f4c5d242 | 394 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
395 | if (err) |
396 | goto fail_out; | |
397 | ||
cbe7cbf5 AV |
398 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
399 | cxt->console_size, 0); | |
b5d38e9b AV |
400 | if (err) |
401 | goto fail_init_cprz; | |
402 | ||
cbe7cbf5 AV |
403 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
404 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
405 | if (err) |
406 | goto fail_init_fprz; | |
407 | ||
408 | if (!cxt->przs && !cxt->cprz && !cxt->fprz) { | |
f4c5d242 | 409 | pr_err("memory size too small, minimum is %lu\n", |
a694d1b5 AV |
410 | cxt->console_size + cxt->record_size + |
411 | cxt->ftrace_size); | |
b5d38e9b | 412 | goto fail_cnt; |
896fc1f0 AV |
413 | } |
414 | ||
9ba80d99 | 415 | cxt->pstore.data = cxt; |
b5d38e9b AV |
416 | /* |
417 | * Console can handle any buffer size, so prefer dumps buffer | |
418 | * size since usually it is smaller. | |
419 | */ | |
420 | if (cxt->przs) | |
421 | cxt->pstore.bufsize = cxt->przs[0]->buffer_size; | |
422 | else | |
423 | cxt->pstore.bufsize = cxt->cprz->buffer_size; | |
9ba80d99 KC |
424 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
425 | spin_lock_init(&cxt->pstore.buf_lock); | |
426 | if (!cxt->pstore.buf) { | |
427 | pr_err("cannot allocate pstore buffer\n"); | |
428 | goto fail_clear; | |
429 | } | |
430 | ||
9ba80d99 | 431 | err = pstore_register(&cxt->pstore); |
56d611a0 | 432 | if (err) { |
9ba80d99 | 433 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 434 | goto fail_buf; |
56d611a0 MS |
435 | } |
436 | ||
c755201e KC |
437 | /* |
438 | * Update the module parameter variables as well so they are visible | |
439 | * through /sys/module/ramoops/parameters/ | |
440 | */ | |
441 | mem_size = pdata->mem_size; | |
442 | mem_address = pdata->mem_address; | |
443 | record_size = pdata->record_size; | |
444 | dump_oops = pdata->dump_oops; | |
445 | ||
5ca5d4e6 | 446 | pr_info("attached 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 447 | cxt->size, (unsigned long long)cxt->phys_addr, |
5ca5d4e6 | 448 | cxt->ecc_size); |
9ba80d99 | 449 | |
56d611a0 MS |
450 | return 0; |
451 | ||
9ba80d99 KC |
452 | fail_buf: |
453 | kfree(cxt->pstore.buf); | |
454 | fail_clear: | |
455 | cxt->pstore.bufsize = 0; | |
cac2eb7b | 456 | cxt->max_dump_cnt = 0; |
b5d38e9b | 457 | fail_cnt: |
a694d1b5 AV |
458 | kfree(cxt->fprz); |
459 | fail_init_fprz: | |
b5d38e9b AV |
460 | kfree(cxt->cprz); |
461 | fail_init_cprz: | |
f4c5d242 | 462 | ramoops_free_przs(cxt); |
9ba80d99 | 463 | fail_out: |
56d611a0 MS |
464 | return err; |
465 | } | |
466 | ||
c3b92ce9 | 467 | static int __exit ramoops_remove(struct platform_device *pdev) |
56d611a0 | 468 | { |
9ba80d99 KC |
469 | #if 0 |
470 | /* TODO(kees): We cannot unload ramoops since pstore doesn't support | |
471 | * unregistering yet. | |
472 | */ | |
56d611a0 MS |
473 | struct ramoops_context *cxt = &oops_cxt; |
474 | ||
56d611a0 MS |
475 | iounmap(cxt->virt_addr); |
476 | release_mem_region(cxt->phys_addr, cxt->size); | |
cac2eb7b | 477 | cxt->max_dump_cnt = 0; |
9ba80d99 KC |
478 | |
479 | /* TODO(kees): When pstore supports unregistering, call it here. */ | |
480 | kfree(cxt->pstore.buf); | |
481 | cxt->pstore.bufsize = 0; | |
482 | ||
c3b92ce9 | 483 | return 0; |
9ba80d99 KC |
484 | #endif |
485 | return -EBUSY; | |
56d611a0 MS |
486 | } |
487 | ||
c3b92ce9 | 488 | static struct platform_driver ramoops_driver = { |
924d3711 | 489 | .probe = ramoops_probe, |
c3b92ce9 KP |
490 | .remove = __exit_p(ramoops_remove), |
491 | .driver = { | |
492 | .name = "ramoops", | |
493 | .owner = THIS_MODULE, | |
494 | }, | |
495 | }; | |
496 | ||
924d3711 | 497 | static void ramoops_register_dummy(void) |
c3b92ce9 | 498 | { |
924d3711 AV |
499 | if (!mem_size) |
500 | return; | |
501 | ||
502 | pr_info("using module parameters\n"); | |
503 | ||
504 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
505 | if (!dummy_data) { | |
506 | pr_info("could not allocate pdata\n"); | |
507 | return; | |
13aefd72 MS |
508 | } |
509 | ||
924d3711 AV |
510 | dummy_data->mem_size = mem_size; |
511 | dummy_data->mem_address = mem_address; | |
512 | dummy_data->record_size = record_size; | |
513 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 514 | dummy_data->ftrace_size = ramoops_ftrace_size; |
924d3711 | 515 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
516 | /* |
517 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
518 | * (using 1 byte for ECC isn't much of use anyway). | |
519 | */ | |
520 | dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; | |
924d3711 AV |
521 | |
522 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
523 | dummy_data, sizeof(struct ramoops_platform_data)); | |
524 | if (IS_ERR(dummy)) { | |
525 | pr_info("could not create platform device: %ld\n", | |
526 | PTR_ERR(dummy)); | |
527 | } | |
528 | } | |
529 | ||
530 | static int __init ramoops_init(void) | |
531 | { | |
532 | ramoops_register_dummy(); | |
533 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 534 | } |
924d3711 | 535 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
536 | |
537 | static void __exit ramoops_exit(void) | |
538 | { | |
539 | platform_driver_unregister(&ramoops_driver); | |
13aefd72 | 540 | kfree(dummy_data); |
c3b92ce9 | 541 | } |
56d611a0 MS |
542 | module_exit(ramoops_exit); |
543 | ||
544 | MODULE_LICENSE("GPL"); | |
545 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
546 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |