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> |
56d611a0 MS |
37 | |
38 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 39 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 40 | |
3e5c4fad SI |
41 | static ulong record_size = MIN_MEM_SIZE; |
42 | module_param(record_size, ulong, 0400); | |
43 | MODULE_PARM_DESC(record_size, | |
44 | "size of each dump done on oops/panic"); | |
56d611a0 | 45 | |
b5d38e9b AV |
46 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
47 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
48 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
49 | ||
a694d1b5 AV |
50 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
51 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
52 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
53 | ||
56d611a0 MS |
54 | static ulong mem_address; |
55 | module_param(mem_address, ulong, 0400); | |
56 | MODULE_PARM_DESC(mem_address, | |
57 | "start of reserved RAM used to store oops/panic logs"); | |
58 | ||
59 | static ulong mem_size; | |
60 | module_param(mem_size, ulong, 0400); | |
61 | MODULE_PARM_DESC(mem_size, | |
62 | "size of reserved RAM used to store oops/panic logs"); | |
63 | ||
64 | static int dump_oops = 1; | |
65 | module_param(dump_oops, int, 0600); | |
66 | MODULE_PARM_DESC(dump_oops, | |
67 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
68 | ||
39eb7e97 AV |
69 | static int ramoops_ecc; |
70 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
71 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
72 | "if non-zero, the option enables ECC support and specifies " |
73 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
74 | "bytes ECC)"); | |
39eb7e97 | 75 | |
9ba80d99 | 76 | struct ramoops_context { |
896fc1f0 | 77 | struct persistent_ram_zone **przs; |
b5d38e9b | 78 | struct persistent_ram_zone *cprz; |
a694d1b5 | 79 | struct persistent_ram_zone *fprz; |
56d611a0 MS |
80 | phys_addr_t phys_addr; |
81 | unsigned long size; | |
9ba80d99 | 82 | size_t record_size; |
b5d38e9b | 83 | size_t console_size; |
a694d1b5 | 84 | size_t ftrace_size; |
6b4d2a27 | 85 | int dump_oops; |
5ca5d4e6 | 86 | int ecc_size; |
cac2eb7b AV |
87 | unsigned int max_dump_cnt; |
88 | unsigned int dump_write_cnt; | |
89 | unsigned int dump_read_cnt; | |
b5d38e9b | 90 | unsigned int console_read_cnt; |
a694d1b5 | 91 | unsigned int ftrace_read_cnt; |
9ba80d99 KC |
92 | struct pstore_info pstore; |
93 | }; | |
56d611a0 | 94 | |
13aefd72 MS |
95 | static struct platform_device *dummy; |
96 | static struct ramoops_platform_data *dummy_data; | |
97 | ||
9ba80d99 KC |
98 | static int ramoops_pstore_open(struct pstore_info *psi) |
99 | { | |
100 | struct ramoops_context *cxt = psi->data; | |
101 | ||
cac2eb7b | 102 | cxt->dump_read_cnt = 0; |
b5d38e9b | 103 | cxt->console_read_cnt = 0; |
9ba80d99 KC |
104 | return 0; |
105 | } | |
106 | ||
755d66b4 AV |
107 | static struct persistent_ram_zone * |
108 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
109 | u64 *id, | |
110 | enum pstore_type_id *typep, enum pstore_type_id type, | |
111 | bool update) | |
112 | { | |
113 | struct persistent_ram_zone *prz; | |
114 | int i = (*c)++; | |
115 | ||
116 | if (i >= max) | |
117 | return NULL; | |
118 | ||
119 | prz = przs[i]; | |
120 | ||
121 | if (update) { | |
122 | /* Update old/shadowed buffer. */ | |
123 | persistent_ram_save_old(prz); | |
124 | if (!persistent_ram_old_size(prz)) | |
125 | return NULL; | |
126 | } | |
127 | ||
128 | *typep = type; | |
129 | *id = i; | |
130 | ||
131 | return prz; | |
132 | } | |
133 | ||
9ba80d99 | 134 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 SA |
135 | int *count, struct timespec *time, |
136 | char **buf, 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 | ||
24203036 AV |
184 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
185 | enum kmsg_dump_reason reason, | |
186 | u64 *id, unsigned int part, | |
187 | const char *buf, size_t size, | |
188 | struct pstore_info *psi) | |
9ba80d99 | 189 | { |
9ba80d99 | 190 | struct ramoops_context *cxt = psi->data; |
c6289378 | 191 | struct persistent_ram_zone *prz; |
896fc1f0 | 192 | size_t hlen; |
9ba80d99 | 193 | |
b5d38e9b AV |
194 | if (type == PSTORE_TYPE_CONSOLE) { |
195 | if (!cxt->cprz) | |
196 | return -ENOMEM; | |
c2b71132 | 197 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 198 | return 0; |
a694d1b5 AV |
199 | } else if (type == PSTORE_TYPE_FTRACE) { |
200 | if (!cxt->fprz) | |
201 | return -ENOMEM; | |
202 | persistent_ram_write(cxt->fprz, buf, size); | |
203 | return 0; | |
b5d38e9b AV |
204 | } |
205 | ||
9ba80d99 KC |
206 | if (type != PSTORE_TYPE_DMESG) |
207 | return -EINVAL; | |
56d611a0 | 208 | |
9ba80d99 KC |
209 | /* Out of the various dmesg dump types, ramoops is currently designed |
210 | * to only store crash logs, rather than storing general kernel logs. | |
211 | */ | |
fc2d557c | 212 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 213 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 214 | return -EINVAL; |
fc2d557c | 215 | |
9ba80d99 | 216 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 217 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
218 | return -EINVAL; |
219 | ||
220 | /* Explicitly only take the first part of any new crash. | |
221 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
222 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
223 | * report split across multiple records. | |
224 | */ | |
225 | if (part != 1) | |
226 | return -ENOSPC; | |
56d611a0 | 227 | |
c6289378 AH |
228 | if (!cxt->przs) |
229 | return -ENOSPC; | |
230 | ||
231 | prz = cxt->przs[cxt->dump_write_cnt]; | |
232 | ||
896fc1f0 AV |
233 | hlen = ramoops_write_kmsg_hdr(prz); |
234 | if (size + hlen > prz->buffer_size) | |
235 | size = prz->buffer_size - hlen; | |
c2b71132 | 236 | persistent_ram_write(prz, buf, size); |
56d611a0 | 237 | |
cac2eb7b | 238 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
755d4fe4 | 243 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 244 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 245 | { |
9ba80d99 | 246 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 247 | struct persistent_ram_zone *prz; |
9ba80d99 | 248 | |
b5d38e9b AV |
249 | switch (type) { |
250 | case PSTORE_TYPE_DMESG: | |
251 | if (id >= cxt->max_dump_cnt) | |
252 | return -EINVAL; | |
253 | prz = cxt->przs[id]; | |
254 | break; | |
255 | case PSTORE_TYPE_CONSOLE: | |
256 | prz = cxt->cprz; | |
257 | break; | |
a694d1b5 AV |
258 | case PSTORE_TYPE_FTRACE: |
259 | prz = cxt->fprz; | |
260 | break; | |
b5d38e9b | 261 | default: |
9ba80d99 | 262 | return -EINVAL; |
b5d38e9b | 263 | } |
9ba80d99 | 264 | |
b5d38e9b AV |
265 | persistent_ram_free_old(prz); |
266 | persistent_ram_zap(prz); | |
9ba80d99 KC |
267 | |
268 | return 0; | |
56d611a0 MS |
269 | } |
270 | ||
9ba80d99 KC |
271 | static struct ramoops_context oops_cxt = { |
272 | .pstore = { | |
273 | .owner = THIS_MODULE, | |
274 | .name = "ramoops", | |
275 | .open = ramoops_pstore_open, | |
276 | .read = ramoops_pstore_read, | |
c2b71132 | 277 | .write_buf = ramoops_pstore_write_buf, |
9ba80d99 KC |
278 | .erase = ramoops_pstore_erase, |
279 | }, | |
280 | }; | |
281 | ||
f4c5d242 AV |
282 | static void ramoops_free_przs(struct ramoops_context *cxt) |
283 | { | |
284 | int i; | |
285 | ||
286 | if (!cxt->przs) | |
287 | return; | |
288 | ||
90b58d96 | 289 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
290 | persistent_ram_free(cxt->przs[i]); |
291 | kfree(cxt->przs); | |
292 | } | |
293 | ||
f568f6ca GKH |
294 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
295 | phys_addr_t *paddr, size_t dump_mem_sz) | |
f4c5d242 AV |
296 | { |
297 | int err = -ENOMEM; | |
298 | int i; | |
299 | ||
300 | if (!cxt->record_size) | |
301 | return 0; | |
302 | ||
c6289378 AH |
303 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
304 | dev_err(dev, "no room for dumps\n"); | |
305 | return -ENOMEM; | |
306 | } | |
307 | ||
f4c5d242 AV |
308 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
309 | if (!cxt->max_dump_cnt) | |
310 | return -ENOMEM; | |
311 | ||
312 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
313 | GFP_KERNEL); | |
314 | if (!cxt->przs) { | |
315 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
316 | return -ENOMEM; | |
317 | } | |
318 | ||
319 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
320 | size_t sz = cxt->record_size; | |
321 | ||
cbe7cbf5 | 322 | cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, cxt->ecc_size); |
f4c5d242 AV |
323 | if (IS_ERR(cxt->przs[i])) { |
324 | err = PTR_ERR(cxt->przs[i]); | |
325 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
326 | sz, (unsigned long long)*paddr, err); | |
327 | goto fail_prz; | |
328 | } | |
329 | *paddr += sz; | |
330 | } | |
331 | ||
332 | return 0; | |
333 | fail_prz: | |
334 | ramoops_free_przs(cxt); | |
335 | return err; | |
336 | } | |
337 | ||
f568f6ca GKH |
338 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
339 | struct persistent_ram_zone **prz, | |
340 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
341 | { |
342 | if (!sz) | |
343 | return 0; | |
344 | ||
c6289378 AH |
345 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
346 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
347 | sz, (unsigned long long)*paddr, | |
348 | cxt->size, (unsigned long long)cxt->phys_addr); | |
b5d38e9b | 349 | return -ENOMEM; |
c6289378 | 350 | } |
b5d38e9b | 351 | |
cbe7cbf5 | 352 | *prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size); |
b5d38e9b AV |
353 | if (IS_ERR(*prz)) { |
354 | int err = PTR_ERR(*prz); | |
355 | ||
356 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
357 | sz, (unsigned long long)*paddr, err); | |
358 | return err; | |
359 | } | |
360 | ||
361 | persistent_ram_zap(*prz); | |
362 | ||
363 | *paddr += sz; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
f568f6ca | 368 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 369 | { |
896fc1f0 | 370 | struct device *dev = &pdev->dev; |
c3b92ce9 | 371 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 | 372 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
373 | size_t dump_mem_sz; |
374 | phys_addr_t paddr; | |
56d611a0 MS |
375 | int err = -EINVAL; |
376 | ||
9ba80d99 KC |
377 | /* Only a single ramoops area allowed at a time, so fail extra |
378 | * probes. | |
379 | */ | |
cac2eb7b | 380 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
381 | goto fail_out; |
382 | ||
a694d1b5 AV |
383 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
384 | !pdata->ftrace_size)) { | |
b5d38e9b | 385 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 386 | "non-zero\n"); |
9ba80d99 | 387 | goto fail_out; |
56d611a0 MS |
388 | } |
389 | ||
b042e474 MB |
390 | if (!is_power_of_2(pdata->mem_size)) |
391 | pdata->mem_size = rounddown_pow_of_two(pdata->mem_size); | |
392 | if (!is_power_of_2(pdata->record_size)) | |
393 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); | |
394 | if (!is_power_of_2(pdata->console_size)) | |
395 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); | |
396 | if (!is_power_of_2(pdata->ftrace_size)) | |
397 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); | |
56d611a0 | 398 | |
cac2eb7b | 399 | cxt->dump_read_cnt = 0; |
13aefd72 MS |
400 | cxt->size = pdata->mem_size; |
401 | cxt->phys_addr = pdata->mem_address; | |
3e5c4fad | 402 | cxt->record_size = pdata->record_size; |
b5d38e9b | 403 | cxt->console_size = pdata->console_size; |
a694d1b5 | 404 | cxt->ftrace_size = pdata->ftrace_size; |
6b4d2a27 | 405 | cxt->dump_oops = pdata->dump_oops; |
5ca5d4e6 | 406 | cxt->ecc_size = pdata->ecc_size; |
56d611a0 | 407 | |
f4c5d242 | 408 | paddr = cxt->phys_addr; |
896fc1f0 | 409 | |
a694d1b5 | 410 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size; |
f4c5d242 | 411 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
412 | if (err) |
413 | goto fail_out; | |
414 | ||
cbe7cbf5 AV |
415 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
416 | cxt->console_size, 0); | |
b5d38e9b AV |
417 | if (err) |
418 | goto fail_init_cprz; | |
419 | ||
cbe7cbf5 AV |
420 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
421 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
422 | if (err) |
423 | goto fail_init_fprz; | |
424 | ||
425 | if (!cxt->przs && !cxt->cprz && !cxt->fprz) { | |
0427193b | 426 | pr_err("memory size too small, minimum is %zu\n", |
a694d1b5 AV |
427 | cxt->console_size + cxt->record_size + |
428 | cxt->ftrace_size); | |
b5d38e9b | 429 | goto fail_cnt; |
896fc1f0 AV |
430 | } |
431 | ||
9ba80d99 | 432 | cxt->pstore.data = cxt; |
b5d38e9b | 433 | /* |
a384f641 AV |
434 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
435 | * have to handle dumps, we must have at least record_size buffer. And | |
436 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
437 | * ZERO_SIZE_PTR). | |
b5d38e9b | 438 | */ |
a384f641 AV |
439 | if (cxt->console_size) |
440 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
441 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 KC |
442 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
443 | spin_lock_init(&cxt->pstore.buf_lock); | |
444 | if (!cxt->pstore.buf) { | |
445 | pr_err("cannot allocate pstore buffer\n"); | |
446 | goto fail_clear; | |
447 | } | |
448 | ||
9ba80d99 | 449 | err = pstore_register(&cxt->pstore); |
56d611a0 | 450 | if (err) { |
9ba80d99 | 451 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 452 | goto fail_buf; |
56d611a0 MS |
453 | } |
454 | ||
c755201e KC |
455 | /* |
456 | * Update the module parameter variables as well so they are visible | |
457 | * through /sys/module/ramoops/parameters/ | |
458 | */ | |
459 | mem_size = pdata->mem_size; | |
460 | mem_address = pdata->mem_address; | |
461 | record_size = pdata->record_size; | |
462 | dump_oops = pdata->dump_oops; | |
463 | ||
5ca5d4e6 | 464 | pr_info("attached 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 465 | cxt->size, (unsigned long long)cxt->phys_addr, |
5ca5d4e6 | 466 | cxt->ecc_size); |
9ba80d99 | 467 | |
56d611a0 MS |
468 | return 0; |
469 | ||
9ba80d99 KC |
470 | fail_buf: |
471 | kfree(cxt->pstore.buf); | |
472 | fail_clear: | |
473 | cxt->pstore.bufsize = 0; | |
cac2eb7b | 474 | cxt->max_dump_cnt = 0; |
b5d38e9b | 475 | fail_cnt: |
a694d1b5 AV |
476 | kfree(cxt->fprz); |
477 | fail_init_fprz: | |
b5d38e9b AV |
478 | kfree(cxt->cprz); |
479 | fail_init_cprz: | |
f4c5d242 | 480 | ramoops_free_przs(cxt); |
9ba80d99 | 481 | fail_out: |
56d611a0 MS |
482 | return err; |
483 | } | |
484 | ||
c3b92ce9 | 485 | static int __exit ramoops_remove(struct platform_device *pdev) |
56d611a0 | 486 | { |
9ba80d99 KC |
487 | #if 0 |
488 | /* TODO(kees): We cannot unload ramoops since pstore doesn't support | |
489 | * unregistering yet. | |
490 | */ | |
56d611a0 MS |
491 | struct ramoops_context *cxt = &oops_cxt; |
492 | ||
56d611a0 MS |
493 | iounmap(cxt->virt_addr); |
494 | release_mem_region(cxt->phys_addr, cxt->size); | |
cac2eb7b | 495 | cxt->max_dump_cnt = 0; |
9ba80d99 KC |
496 | |
497 | /* TODO(kees): When pstore supports unregistering, call it here. */ | |
498 | kfree(cxt->pstore.buf); | |
499 | cxt->pstore.bufsize = 0; | |
500 | ||
c3b92ce9 | 501 | return 0; |
9ba80d99 KC |
502 | #endif |
503 | return -EBUSY; | |
56d611a0 MS |
504 | } |
505 | ||
c3b92ce9 | 506 | static struct platform_driver ramoops_driver = { |
924d3711 | 507 | .probe = ramoops_probe, |
c3b92ce9 KP |
508 | .remove = __exit_p(ramoops_remove), |
509 | .driver = { | |
510 | .name = "ramoops", | |
511 | .owner = THIS_MODULE, | |
512 | }, | |
513 | }; | |
514 | ||
924d3711 | 515 | static void ramoops_register_dummy(void) |
c3b92ce9 | 516 | { |
924d3711 AV |
517 | if (!mem_size) |
518 | return; | |
519 | ||
520 | pr_info("using module parameters\n"); | |
521 | ||
522 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
523 | if (!dummy_data) { | |
524 | pr_info("could not allocate pdata\n"); | |
525 | return; | |
13aefd72 MS |
526 | } |
527 | ||
924d3711 AV |
528 | dummy_data->mem_size = mem_size; |
529 | dummy_data->mem_address = mem_address; | |
530 | dummy_data->record_size = record_size; | |
531 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 532 | dummy_data->ftrace_size = ramoops_ftrace_size; |
924d3711 | 533 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
534 | /* |
535 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
536 | * (using 1 byte for ECC isn't much of use anyway). | |
537 | */ | |
538 | dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; | |
924d3711 AV |
539 | |
540 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
541 | dummy_data, sizeof(struct ramoops_platform_data)); | |
542 | if (IS_ERR(dummy)) { | |
543 | pr_info("could not create platform device: %ld\n", | |
544 | PTR_ERR(dummy)); | |
545 | } | |
546 | } | |
547 | ||
548 | static int __init ramoops_init(void) | |
549 | { | |
550 | ramoops_register_dummy(); | |
551 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 552 | } |
924d3711 | 553 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
554 | |
555 | static void __exit ramoops_exit(void) | |
556 | { | |
557 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 558 | platform_device_unregister(dummy); |
13aefd72 | 559 | kfree(dummy_data); |
c3b92ce9 | 560 | } |
56d611a0 MS |
561 | module_exit(ramoops_exit); |
562 | ||
563 | MODULE_LICENSE("GPL"); | |
564 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
565 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |