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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> |
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; |
c31ad081 | 86 | struct persistent_ram_ecc_info ecc_info; |
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 | ||
3f8f80f0 AB |
134 | static void ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
135 | bool *compressed) | |
136 | { | |
137 | char data_type; | |
138 | ||
139 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", | |
140 | &time->tv_sec, &time->tv_nsec, &data_type) == 3) { | |
141 | if (data_type == 'C') | |
142 | *compressed = true; | |
143 | else | |
144 | *compressed = false; | |
145 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n", | |
146 | &time->tv_sec, &time->tv_nsec) == 2) { | |
147 | *compressed = false; | |
148 | } else { | |
149 | time->tv_sec = 0; | |
150 | time->tv_nsec = 0; | |
151 | *compressed = false; | |
152 | } | |
153 | } | |
154 | ||
9ba80d99 | 155 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 | 156 | int *count, struct timespec *time, |
9a4e1398 AB |
157 | char **buf, bool *compressed, |
158 | struct pstore_info *psi) | |
56d611a0 | 159 | { |
9ba80d99 | 160 | ssize_t size; |
bd08ec33 | 161 | ssize_t ecc_notice_size; |
9ba80d99 | 162 | struct ramoops_context *cxt = psi->data; |
896fc1f0 | 163 | struct persistent_ram_zone *prz; |
9ba80d99 | 164 | |
755d66b4 AV |
165 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, |
166 | cxt->max_dump_cnt, id, type, | |
167 | PSTORE_TYPE_DMESG, 1); | |
b5d38e9b AV |
168 | if (!prz) |
169 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, | |
170 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
a694d1b5 AV |
171 | if (!prz) |
172 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, | |
173 | 1, id, type, PSTORE_TYPE_FTRACE, 0); | |
755d66b4 AV |
174 | if (!prz) |
175 | return 0; | |
896fc1f0 | 176 | |
896fc1f0 | 177 | size = persistent_ram_old_size(prz); |
bd08ec33 AH |
178 | |
179 | /* ECC correction notice */ | |
180 | ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); | |
181 | ||
182 | *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL); | |
9ba80d99 KC |
183 | if (*buf == NULL) |
184 | return -ENOMEM; | |
9ba80d99 | 185 | |
bd08ec33 | 186 | memcpy(*buf, persistent_ram_old(prz), size); |
3f8f80f0 | 187 | ramoops_read_kmsg_hdr(*buf, time, compressed); |
bd08ec33 AH |
188 | persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1); |
189 | ||
190 | return size + ecc_notice_size; | |
9ba80d99 KC |
191 | } |
192 | ||
3f8f80f0 AB |
193 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
194 | bool compressed) | |
896fc1f0 AV |
195 | { |
196 | char *hdr; | |
1e817fb6 | 197 | struct timespec timestamp; |
896fc1f0 AV |
198 | size_t len; |
199 | ||
1e817fb6 KC |
200 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
201 | if (__getnstimeofday(×tamp)) { | |
202 | timestamp.tv_sec = 0; | |
203 | timestamp.tv_nsec = 0; | |
204 | } | |
3f8f80f0 AB |
205 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
206 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
207 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
208 | WARN_ON_ONCE(!hdr); |
209 | len = hdr ? strlen(hdr) : 0; | |
210 | persistent_ram_write(prz, hdr, len); | |
211 | kfree(hdr); | |
212 | ||
213 | return len; | |
214 | } | |
215 | ||
24203036 AV |
216 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
217 | enum kmsg_dump_reason reason, | |
218 | u64 *id, unsigned int part, | |
6bbbca73 | 219 | const char *buf, |
b3b515bb | 220 | bool compressed, size_t size, |
24203036 | 221 | struct pstore_info *psi) |
9ba80d99 | 222 | { |
9ba80d99 | 223 | struct ramoops_context *cxt = psi->data; |
c6289378 | 224 | struct persistent_ram_zone *prz; |
896fc1f0 | 225 | size_t hlen; |
9ba80d99 | 226 | |
b5d38e9b AV |
227 | if (type == PSTORE_TYPE_CONSOLE) { |
228 | if (!cxt->cprz) | |
229 | return -ENOMEM; | |
c2b71132 | 230 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 231 | return 0; |
a694d1b5 AV |
232 | } else if (type == PSTORE_TYPE_FTRACE) { |
233 | if (!cxt->fprz) | |
234 | return -ENOMEM; | |
235 | persistent_ram_write(cxt->fprz, buf, size); | |
236 | return 0; | |
b5d38e9b AV |
237 | } |
238 | ||
9ba80d99 KC |
239 | if (type != PSTORE_TYPE_DMESG) |
240 | return -EINVAL; | |
56d611a0 | 241 | |
9ba80d99 KC |
242 | /* Out of the various dmesg dump types, ramoops is currently designed |
243 | * to only store crash logs, rather than storing general kernel logs. | |
244 | */ | |
fc2d557c | 245 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 246 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 247 | return -EINVAL; |
fc2d557c | 248 | |
9ba80d99 | 249 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 250 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
251 | return -EINVAL; |
252 | ||
253 | /* Explicitly only take the first part of any new crash. | |
254 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
255 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
256 | * report split across multiple records. | |
257 | */ | |
258 | if (part != 1) | |
259 | return -ENOSPC; | |
56d611a0 | 260 | |
c6289378 AH |
261 | if (!cxt->przs) |
262 | return -ENOSPC; | |
263 | ||
264 | prz = cxt->przs[cxt->dump_write_cnt]; | |
265 | ||
3f8f80f0 | 266 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
896fc1f0 AV |
267 | if (size + hlen > prz->buffer_size) |
268 | size = prz->buffer_size - hlen; | |
c2b71132 | 269 | persistent_ram_write(prz, buf, size); |
56d611a0 | 270 | |
cac2eb7b | 271 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
272 | |
273 | return 0; | |
274 | } | |
275 | ||
755d4fe4 | 276 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 277 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 278 | { |
9ba80d99 | 279 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 280 | struct persistent_ram_zone *prz; |
9ba80d99 | 281 | |
b5d38e9b AV |
282 | switch (type) { |
283 | case PSTORE_TYPE_DMESG: | |
284 | if (id >= cxt->max_dump_cnt) | |
285 | return -EINVAL; | |
286 | prz = cxt->przs[id]; | |
287 | break; | |
288 | case PSTORE_TYPE_CONSOLE: | |
289 | prz = cxt->cprz; | |
290 | break; | |
a694d1b5 AV |
291 | case PSTORE_TYPE_FTRACE: |
292 | prz = cxt->fprz; | |
293 | break; | |
b5d38e9b | 294 | default: |
9ba80d99 | 295 | return -EINVAL; |
b5d38e9b | 296 | } |
9ba80d99 | 297 | |
b5d38e9b AV |
298 | persistent_ram_free_old(prz); |
299 | persistent_ram_zap(prz); | |
9ba80d99 KC |
300 | |
301 | return 0; | |
56d611a0 MS |
302 | } |
303 | ||
9ba80d99 KC |
304 | static struct ramoops_context oops_cxt = { |
305 | .pstore = { | |
306 | .owner = THIS_MODULE, | |
307 | .name = "ramoops", | |
308 | .open = ramoops_pstore_open, | |
309 | .read = ramoops_pstore_read, | |
c2b71132 | 310 | .write_buf = ramoops_pstore_write_buf, |
9ba80d99 KC |
311 | .erase = ramoops_pstore_erase, |
312 | }, | |
313 | }; | |
314 | ||
f4c5d242 AV |
315 | static void ramoops_free_przs(struct ramoops_context *cxt) |
316 | { | |
317 | int i; | |
318 | ||
319 | if (!cxt->przs) | |
320 | return; | |
321 | ||
90b58d96 | 322 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
323 | persistent_ram_free(cxt->przs[i]); |
324 | kfree(cxt->przs); | |
325 | } | |
326 | ||
f568f6ca GKH |
327 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
328 | phys_addr_t *paddr, size_t dump_mem_sz) | |
f4c5d242 AV |
329 | { |
330 | int err = -ENOMEM; | |
331 | int i; | |
332 | ||
333 | if (!cxt->record_size) | |
334 | return 0; | |
335 | ||
c6289378 AH |
336 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
337 | dev_err(dev, "no room for dumps\n"); | |
338 | return -ENOMEM; | |
339 | } | |
340 | ||
f4c5d242 AV |
341 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
342 | if (!cxt->max_dump_cnt) | |
343 | return -ENOMEM; | |
344 | ||
345 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
346 | GFP_KERNEL); | |
347 | if (!cxt->przs) { | |
348 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
349 | return -ENOMEM; | |
350 | } | |
351 | ||
352 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
353 | size_t sz = cxt->record_size; | |
354 | ||
c31ad081 AH |
355 | cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, |
356 | &cxt->ecc_info); | |
f4c5d242 AV |
357 | if (IS_ERR(cxt->przs[i])) { |
358 | err = PTR_ERR(cxt->przs[i]); | |
359 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
360 | sz, (unsigned long long)*paddr, err); | |
361 | goto fail_prz; | |
362 | } | |
363 | *paddr += sz; | |
364 | } | |
365 | ||
366 | return 0; | |
367 | fail_prz: | |
368 | ramoops_free_przs(cxt); | |
369 | return err; | |
370 | } | |
371 | ||
f568f6ca GKH |
372 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
373 | struct persistent_ram_zone **prz, | |
374 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
375 | { |
376 | if (!sz) | |
377 | return 0; | |
378 | ||
c6289378 AH |
379 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
380 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
381 | sz, (unsigned long long)*paddr, | |
382 | cxt->size, (unsigned long long)cxt->phys_addr); | |
b5d38e9b | 383 | return -ENOMEM; |
c6289378 | 384 | } |
b5d38e9b | 385 | |
c31ad081 | 386 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info); |
b5d38e9b AV |
387 | if (IS_ERR(*prz)) { |
388 | int err = PTR_ERR(*prz); | |
389 | ||
390 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
391 | sz, (unsigned long long)*paddr, err); | |
392 | return err; | |
393 | } | |
394 | ||
395 | persistent_ram_zap(*prz); | |
396 | ||
397 | *paddr += sz; | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
f568f6ca | 402 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 403 | { |
896fc1f0 | 404 | struct device *dev = &pdev->dev; |
c3b92ce9 | 405 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 | 406 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
407 | size_t dump_mem_sz; |
408 | phys_addr_t paddr; | |
56d611a0 MS |
409 | int err = -EINVAL; |
410 | ||
9ba80d99 KC |
411 | /* Only a single ramoops area allowed at a time, so fail extra |
412 | * probes. | |
413 | */ | |
cac2eb7b | 414 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
415 | goto fail_out; |
416 | ||
a694d1b5 AV |
417 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
418 | !pdata->ftrace_size)) { | |
b5d38e9b | 419 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 420 | "non-zero\n"); |
9ba80d99 | 421 | goto fail_out; |
56d611a0 MS |
422 | } |
423 | ||
3bd11cf5 | 424 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 425 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 426 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 427 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 428 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 429 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
56d611a0 | 430 | |
cac2eb7b | 431 | cxt->dump_read_cnt = 0; |
13aefd72 MS |
432 | cxt->size = pdata->mem_size; |
433 | cxt->phys_addr = pdata->mem_address; | |
3e5c4fad | 434 | cxt->record_size = pdata->record_size; |
b5d38e9b | 435 | cxt->console_size = pdata->console_size; |
a694d1b5 | 436 | cxt->ftrace_size = pdata->ftrace_size; |
6b4d2a27 | 437 | cxt->dump_oops = pdata->dump_oops; |
c31ad081 | 438 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 439 | |
f4c5d242 | 440 | paddr = cxt->phys_addr; |
896fc1f0 | 441 | |
a694d1b5 | 442 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size; |
f4c5d242 | 443 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
444 | if (err) |
445 | goto fail_out; | |
446 | ||
cbe7cbf5 AV |
447 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
448 | cxt->console_size, 0); | |
b5d38e9b AV |
449 | if (err) |
450 | goto fail_init_cprz; | |
451 | ||
cbe7cbf5 AV |
452 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
453 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
454 | if (err) |
455 | goto fail_init_fprz; | |
456 | ||
457 | if (!cxt->przs && !cxt->cprz && !cxt->fprz) { | |
0427193b | 458 | pr_err("memory size too small, minimum is %zu\n", |
a694d1b5 AV |
459 | cxt->console_size + cxt->record_size + |
460 | cxt->ftrace_size); | |
47110b88 | 461 | err = -EINVAL; |
b5d38e9b | 462 | goto fail_cnt; |
896fc1f0 AV |
463 | } |
464 | ||
9ba80d99 | 465 | cxt->pstore.data = cxt; |
b5d38e9b | 466 | /* |
a384f641 AV |
467 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
468 | * have to handle dumps, we must have at least record_size buffer. And | |
469 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
470 | * ZERO_SIZE_PTR). | |
b5d38e9b | 471 | */ |
a384f641 AV |
472 | if (cxt->console_size) |
473 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
474 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 KC |
475 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
476 | spin_lock_init(&cxt->pstore.buf_lock); | |
477 | if (!cxt->pstore.buf) { | |
478 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 479 | err = -ENOMEM; |
9ba80d99 KC |
480 | goto fail_clear; |
481 | } | |
482 | ||
9ba80d99 | 483 | err = pstore_register(&cxt->pstore); |
56d611a0 | 484 | if (err) { |
9ba80d99 | 485 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 486 | goto fail_buf; |
56d611a0 MS |
487 | } |
488 | ||
c755201e KC |
489 | /* |
490 | * Update the module parameter variables as well so they are visible | |
491 | * through /sys/module/ramoops/parameters/ | |
492 | */ | |
493 | mem_size = pdata->mem_size; | |
494 | mem_address = pdata->mem_address; | |
495 | record_size = pdata->record_size; | |
496 | dump_oops = pdata->dump_oops; | |
497 | ||
c31ad081 | 498 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 499 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 500 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 501 | |
56d611a0 MS |
502 | return 0; |
503 | ||
9ba80d99 KC |
504 | fail_buf: |
505 | kfree(cxt->pstore.buf); | |
506 | fail_clear: | |
507 | cxt->pstore.bufsize = 0; | |
cac2eb7b | 508 | cxt->max_dump_cnt = 0; |
b5d38e9b | 509 | fail_cnt: |
a694d1b5 AV |
510 | kfree(cxt->fprz); |
511 | fail_init_fprz: | |
b5d38e9b AV |
512 | kfree(cxt->cprz); |
513 | fail_init_cprz: | |
f4c5d242 | 514 | ramoops_free_przs(cxt); |
9ba80d99 | 515 | fail_out: |
56d611a0 MS |
516 | return err; |
517 | } | |
518 | ||
c3b92ce9 | 519 | static int __exit ramoops_remove(struct platform_device *pdev) |
56d611a0 | 520 | { |
9ba80d99 KC |
521 | #if 0 |
522 | /* TODO(kees): We cannot unload ramoops since pstore doesn't support | |
523 | * unregistering yet. | |
524 | */ | |
56d611a0 MS |
525 | struct ramoops_context *cxt = &oops_cxt; |
526 | ||
56d611a0 MS |
527 | iounmap(cxt->virt_addr); |
528 | release_mem_region(cxt->phys_addr, cxt->size); | |
cac2eb7b | 529 | cxt->max_dump_cnt = 0; |
9ba80d99 KC |
530 | |
531 | /* TODO(kees): When pstore supports unregistering, call it here. */ | |
532 | kfree(cxt->pstore.buf); | |
533 | cxt->pstore.bufsize = 0; | |
534 | ||
c3b92ce9 | 535 | return 0; |
9ba80d99 KC |
536 | #endif |
537 | return -EBUSY; | |
56d611a0 MS |
538 | } |
539 | ||
c3b92ce9 | 540 | static struct platform_driver ramoops_driver = { |
924d3711 | 541 | .probe = ramoops_probe, |
c3b92ce9 KP |
542 | .remove = __exit_p(ramoops_remove), |
543 | .driver = { | |
544 | .name = "ramoops", | |
545 | .owner = THIS_MODULE, | |
546 | }, | |
547 | }; | |
548 | ||
924d3711 | 549 | static void ramoops_register_dummy(void) |
c3b92ce9 | 550 | { |
924d3711 AV |
551 | if (!mem_size) |
552 | return; | |
553 | ||
554 | pr_info("using module parameters\n"); | |
555 | ||
556 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
557 | if (!dummy_data) { | |
558 | pr_info("could not allocate pdata\n"); | |
559 | return; | |
13aefd72 MS |
560 | } |
561 | ||
924d3711 AV |
562 | dummy_data->mem_size = mem_size; |
563 | dummy_data->mem_address = mem_address; | |
564 | dummy_data->record_size = record_size; | |
565 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 566 | dummy_data->ftrace_size = ramoops_ftrace_size; |
924d3711 | 567 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
568 | /* |
569 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
570 | * (using 1 byte for ECC isn't much of use anyway). | |
571 | */ | |
c31ad081 | 572 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
573 | |
574 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
575 | dummy_data, sizeof(struct ramoops_platform_data)); | |
576 | if (IS_ERR(dummy)) { | |
577 | pr_info("could not create platform device: %ld\n", | |
578 | PTR_ERR(dummy)); | |
579 | } | |
580 | } | |
581 | ||
582 | static int __init ramoops_init(void) | |
583 | { | |
584 | ramoops_register_dummy(); | |
585 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 586 | } |
924d3711 | 587 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
588 | |
589 | static void __exit ramoops_exit(void) | |
590 | { | |
591 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 592 | platform_device_unregister(dummy); |
13aefd72 | 593 | kfree(dummy_data); |
c3b92ce9 | 594 | } |
56d611a0 MS |
595 | module_exit(ramoops_exit); |
596 | ||
597 | MODULE_LICENSE("GPL"); | |
598 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
599 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |