]>
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 | ||
027bc8b0 TL |
64 | static unsigned int mem_type; |
65 | module_param(mem_type, uint, 0600); | |
66 | MODULE_PARM_DESC(mem_type, | |
67 | "set to 1 to try to use unbuffered memory (default 0)"); | |
68 | ||
56d611a0 MS |
69 | static int dump_oops = 1; |
70 | module_param(dump_oops, int, 0600); | |
71 | MODULE_PARM_DESC(dump_oops, | |
72 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
73 | ||
39eb7e97 AV |
74 | static int ramoops_ecc; |
75 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
76 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
77 | "if non-zero, the option enables ECC support and specifies " |
78 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
79 | "bytes ECC)"); | |
39eb7e97 | 80 | |
9ba80d99 | 81 | struct ramoops_context { |
896fc1f0 | 82 | struct persistent_ram_zone **przs; |
b5d38e9b | 83 | struct persistent_ram_zone *cprz; |
a694d1b5 | 84 | struct persistent_ram_zone *fprz; |
56d611a0 MS |
85 | phys_addr_t phys_addr; |
86 | unsigned long size; | |
027bc8b0 | 87 | unsigned int memtype; |
9ba80d99 | 88 | size_t record_size; |
b5d38e9b | 89 | size_t console_size; |
a694d1b5 | 90 | size_t ftrace_size; |
6b4d2a27 | 91 | int dump_oops; |
c31ad081 | 92 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
93 | unsigned int max_dump_cnt; |
94 | unsigned int dump_write_cnt; | |
57fd8353 | 95 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 96 | unsigned int dump_read_cnt; |
b5d38e9b | 97 | unsigned int console_read_cnt; |
a694d1b5 | 98 | unsigned int ftrace_read_cnt; |
9ba80d99 KC |
99 | struct pstore_info pstore; |
100 | }; | |
56d611a0 | 101 | |
13aefd72 MS |
102 | static struct platform_device *dummy; |
103 | static struct ramoops_platform_data *dummy_data; | |
104 | ||
9ba80d99 KC |
105 | static int ramoops_pstore_open(struct pstore_info *psi) |
106 | { | |
107 | struct ramoops_context *cxt = psi->data; | |
108 | ||
cac2eb7b | 109 | cxt->dump_read_cnt = 0; |
b5d38e9b | 110 | cxt->console_read_cnt = 0; |
57fd8353 | 111 | cxt->ftrace_read_cnt = 0; |
9ba80d99 KC |
112 | return 0; |
113 | } | |
114 | ||
755d66b4 AV |
115 | static struct persistent_ram_zone * |
116 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
117 | u64 *id, | |
118 | enum pstore_type_id *typep, enum pstore_type_id type, | |
119 | bool update) | |
120 | { | |
121 | struct persistent_ram_zone *prz; | |
122 | int i = (*c)++; | |
123 | ||
124 | if (i >= max) | |
125 | return NULL; | |
126 | ||
127 | prz = przs[i]; | |
b0aa931f LS |
128 | if (!prz) |
129 | return NULL; | |
755d66b4 | 130 | |
aa9a4a1e LS |
131 | /* Update old/shadowed buffer. */ |
132 | if (update) | |
755d66b4 | 133 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
134 | |
135 | if (!persistent_ram_old_size(prz)) | |
136 | return NULL; | |
755d66b4 AV |
137 | |
138 | *typep = type; | |
139 | *id = i; | |
140 | ||
141 | return prz; | |
142 | } | |
143 | ||
a28726b4 | 144 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
3f8f80f0 AB |
145 | bool *compressed) |
146 | { | |
147 | char data_type; | |
a28726b4 | 148 | int header_length = 0; |
3f8f80f0 | 149 | |
a28726b4 BZ |
150 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
151 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
3f8f80f0 AB |
152 | if (data_type == 'C') |
153 | *compressed = true; | |
154 | else | |
155 | *compressed = false; | |
a28726b4 BZ |
156 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
157 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
3f8f80f0 AB |
158 | *compressed = false; |
159 | } else { | |
160 | time->tv_sec = 0; | |
161 | time->tv_nsec = 0; | |
162 | *compressed = false; | |
163 | } | |
a28726b4 | 164 | return header_length; |
3f8f80f0 AB |
165 | } |
166 | ||
9ba80d99 | 167 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 | 168 | int *count, struct timespec *time, |
9a4e1398 AB |
169 | char **buf, bool *compressed, |
170 | struct pstore_info *psi) | |
56d611a0 | 171 | { |
9ba80d99 | 172 | ssize_t size; |
bd08ec33 | 173 | ssize_t ecc_notice_size; |
9ba80d99 | 174 | struct ramoops_context *cxt = psi->data; |
896fc1f0 | 175 | struct persistent_ram_zone *prz; |
a28726b4 | 176 | int header_length; |
9ba80d99 | 177 | |
755d66b4 AV |
178 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, |
179 | cxt->max_dump_cnt, id, type, | |
180 | PSTORE_TYPE_DMESG, 1); | |
b5d38e9b AV |
181 | if (!prz) |
182 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, | |
183 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
a694d1b5 AV |
184 | if (!prz) |
185 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, | |
186 | 1, id, type, PSTORE_TYPE_FTRACE, 0); | |
755d66b4 AV |
187 | if (!prz) |
188 | return 0; | |
896fc1f0 | 189 | |
a28726b4 BZ |
190 | if (!persistent_ram_old(prz)) |
191 | return 0; | |
192 | ||
896fc1f0 | 193 | size = persistent_ram_old_size(prz); |
a28726b4 BZ |
194 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), time, |
195 | compressed); | |
196 | size -= header_length; | |
bd08ec33 AH |
197 | |
198 | /* ECC correction notice */ | |
199 | ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); | |
200 | ||
201 | *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL); | |
9ba80d99 KC |
202 | if (*buf == NULL) |
203 | return -ENOMEM; | |
9ba80d99 | 204 | |
a28726b4 | 205 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); |
bd08ec33 AH |
206 | persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1); |
207 | ||
208 | return size + ecc_notice_size; | |
9ba80d99 KC |
209 | } |
210 | ||
3f8f80f0 AB |
211 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
212 | bool compressed) | |
896fc1f0 AV |
213 | { |
214 | char *hdr; | |
1e817fb6 | 215 | struct timespec timestamp; |
896fc1f0 AV |
216 | size_t len; |
217 | ||
1e817fb6 KC |
218 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
219 | if (__getnstimeofday(×tamp)) { | |
220 | timestamp.tv_sec = 0; | |
221 | timestamp.tv_nsec = 0; | |
222 | } | |
3f8f80f0 AB |
223 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
224 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
225 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
226 | WARN_ON_ONCE(!hdr); |
227 | len = hdr ? strlen(hdr) : 0; | |
228 | persistent_ram_write(prz, hdr, len); | |
229 | kfree(hdr); | |
230 | ||
231 | return len; | |
232 | } | |
233 | ||
24203036 AV |
234 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
235 | enum kmsg_dump_reason reason, | |
236 | u64 *id, unsigned int part, | |
6bbbca73 | 237 | const char *buf, |
b3b515bb | 238 | bool compressed, size_t size, |
24203036 | 239 | struct pstore_info *psi) |
9ba80d99 | 240 | { |
9ba80d99 | 241 | struct ramoops_context *cxt = psi->data; |
c6289378 | 242 | struct persistent_ram_zone *prz; |
896fc1f0 | 243 | size_t hlen; |
9ba80d99 | 244 | |
b5d38e9b AV |
245 | if (type == PSTORE_TYPE_CONSOLE) { |
246 | if (!cxt->cprz) | |
247 | return -ENOMEM; | |
c2b71132 | 248 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 249 | return 0; |
a694d1b5 AV |
250 | } else if (type == PSTORE_TYPE_FTRACE) { |
251 | if (!cxt->fprz) | |
252 | return -ENOMEM; | |
253 | persistent_ram_write(cxt->fprz, buf, size); | |
254 | return 0; | |
b5d38e9b AV |
255 | } |
256 | ||
9ba80d99 KC |
257 | if (type != PSTORE_TYPE_DMESG) |
258 | return -EINVAL; | |
56d611a0 | 259 | |
9ba80d99 KC |
260 | /* Out of the various dmesg dump types, ramoops is currently designed |
261 | * to only store crash logs, rather than storing general kernel logs. | |
262 | */ | |
fc2d557c | 263 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 264 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 265 | return -EINVAL; |
fc2d557c | 266 | |
9ba80d99 | 267 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 268 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
269 | return -EINVAL; |
270 | ||
271 | /* Explicitly only take the first part of any new crash. | |
272 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
273 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
274 | * report split across multiple records. | |
275 | */ | |
276 | if (part != 1) | |
277 | return -ENOSPC; | |
56d611a0 | 278 | |
c6289378 AH |
279 | if (!cxt->przs) |
280 | return -ENOSPC; | |
281 | ||
282 | prz = cxt->przs[cxt->dump_write_cnt]; | |
283 | ||
3f8f80f0 | 284 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
896fc1f0 AV |
285 | if (size + hlen > prz->buffer_size) |
286 | size = prz->buffer_size - hlen; | |
c2b71132 | 287 | persistent_ram_write(prz, buf, size); |
56d611a0 | 288 | |
cac2eb7b | 289 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
755d4fe4 | 294 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 295 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 296 | { |
9ba80d99 | 297 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 298 | struct persistent_ram_zone *prz; |
9ba80d99 | 299 | |
b5d38e9b AV |
300 | switch (type) { |
301 | case PSTORE_TYPE_DMESG: | |
302 | if (id >= cxt->max_dump_cnt) | |
303 | return -EINVAL; | |
304 | prz = cxt->przs[id]; | |
305 | break; | |
306 | case PSTORE_TYPE_CONSOLE: | |
307 | prz = cxt->cprz; | |
308 | break; | |
a694d1b5 AV |
309 | case PSTORE_TYPE_FTRACE: |
310 | prz = cxt->fprz; | |
311 | break; | |
b5d38e9b | 312 | default: |
9ba80d99 | 313 | return -EINVAL; |
b5d38e9b | 314 | } |
9ba80d99 | 315 | |
b5d38e9b AV |
316 | persistent_ram_free_old(prz); |
317 | persistent_ram_zap(prz); | |
9ba80d99 KC |
318 | |
319 | return 0; | |
56d611a0 MS |
320 | } |
321 | ||
9ba80d99 KC |
322 | static struct ramoops_context oops_cxt = { |
323 | .pstore = { | |
324 | .owner = THIS_MODULE, | |
325 | .name = "ramoops", | |
326 | .open = ramoops_pstore_open, | |
327 | .read = ramoops_pstore_read, | |
c2b71132 | 328 | .write_buf = ramoops_pstore_write_buf, |
9ba80d99 KC |
329 | .erase = ramoops_pstore_erase, |
330 | }, | |
331 | }; | |
332 | ||
f4c5d242 AV |
333 | static void ramoops_free_przs(struct ramoops_context *cxt) |
334 | { | |
335 | int i; | |
336 | ||
34f0ec82 | 337 | cxt->max_dump_cnt = 0; |
f4c5d242 AV |
338 | if (!cxt->przs) |
339 | return; | |
340 | ||
90b58d96 | 341 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
342 | persistent_ram_free(cxt->przs[i]); |
343 | kfree(cxt->przs); | |
344 | } | |
345 | ||
f568f6ca GKH |
346 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
347 | phys_addr_t *paddr, size_t dump_mem_sz) | |
f4c5d242 AV |
348 | { |
349 | int err = -ENOMEM; | |
350 | int i; | |
351 | ||
352 | if (!cxt->record_size) | |
353 | return 0; | |
354 | ||
c6289378 AH |
355 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
356 | dev_err(dev, "no room for dumps\n"); | |
357 | return -ENOMEM; | |
358 | } | |
359 | ||
f4c5d242 AV |
360 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
361 | if (!cxt->max_dump_cnt) | |
362 | return -ENOMEM; | |
363 | ||
364 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
365 | GFP_KERNEL); | |
366 | if (!cxt->przs) { | |
367 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
34f0ec82 | 368 | goto fail_prz; |
f4c5d242 AV |
369 | } |
370 | ||
371 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
372 | size_t sz = cxt->record_size; | |
373 | ||
c31ad081 | 374 | cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, |
027bc8b0 TL |
375 | &cxt->ecc_info, |
376 | cxt->memtype); | |
f4c5d242 AV |
377 | if (IS_ERR(cxt->przs[i])) { |
378 | err = PTR_ERR(cxt->przs[i]); | |
379 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
380 | sz, (unsigned long long)*paddr, err); | |
381 | goto fail_prz; | |
382 | } | |
383 | *paddr += sz; | |
384 | } | |
385 | ||
386 | return 0; | |
387 | fail_prz: | |
388 | ramoops_free_przs(cxt); | |
389 | return err; | |
390 | } | |
391 | ||
f568f6ca GKH |
392 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
393 | struct persistent_ram_zone **prz, | |
394 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
395 | { |
396 | if (!sz) | |
397 | return 0; | |
398 | ||
c6289378 AH |
399 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
400 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
401 | sz, (unsigned long long)*paddr, | |
402 | cxt->size, (unsigned long long)cxt->phys_addr); | |
b5d38e9b | 403 | return -ENOMEM; |
c6289378 | 404 | } |
b5d38e9b | 405 | |
027bc8b0 | 406 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype); |
b5d38e9b AV |
407 | if (IS_ERR(*prz)) { |
408 | int err = PTR_ERR(*prz); | |
409 | ||
410 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
411 | sz, (unsigned long long)*paddr, err); | |
412 | return err; | |
413 | } | |
414 | ||
415 | persistent_ram_zap(*prz); | |
416 | ||
417 | *paddr += sz; | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
f568f6ca | 422 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 423 | { |
896fc1f0 | 424 | struct device *dev = &pdev->dev; |
c3b92ce9 | 425 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 | 426 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
427 | size_t dump_mem_sz; |
428 | phys_addr_t paddr; | |
56d611a0 MS |
429 | int err = -EINVAL; |
430 | ||
9ba80d99 KC |
431 | /* Only a single ramoops area allowed at a time, so fail extra |
432 | * probes. | |
433 | */ | |
cac2eb7b | 434 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
435 | goto fail_out; |
436 | ||
a694d1b5 AV |
437 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
438 | !pdata->ftrace_size)) { | |
b5d38e9b | 439 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 440 | "non-zero\n"); |
9ba80d99 | 441 | goto fail_out; |
56d611a0 MS |
442 | } |
443 | ||
3bd11cf5 | 444 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 445 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 446 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 447 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 448 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 449 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
56d611a0 | 450 | |
13aefd72 MS |
451 | cxt->size = pdata->mem_size; |
452 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 453 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 454 | cxt->record_size = pdata->record_size; |
b5d38e9b | 455 | cxt->console_size = pdata->console_size; |
a694d1b5 | 456 | cxt->ftrace_size = pdata->ftrace_size; |
6b4d2a27 | 457 | cxt->dump_oops = pdata->dump_oops; |
c31ad081 | 458 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 459 | |
f4c5d242 | 460 | paddr = cxt->phys_addr; |
896fc1f0 | 461 | |
a694d1b5 | 462 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size; |
f4c5d242 | 463 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
464 | if (err) |
465 | goto fail_out; | |
466 | ||
cbe7cbf5 AV |
467 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
468 | cxt->console_size, 0); | |
b5d38e9b AV |
469 | if (err) |
470 | goto fail_init_cprz; | |
471 | ||
cbe7cbf5 AV |
472 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
473 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
474 | if (err) |
475 | goto fail_init_fprz; | |
476 | ||
477 | if (!cxt->przs && !cxt->cprz && !cxt->fprz) { | |
0427193b | 478 | pr_err("memory size too small, minimum is %zu\n", |
a694d1b5 AV |
479 | cxt->console_size + cxt->record_size + |
480 | cxt->ftrace_size); | |
47110b88 | 481 | err = -EINVAL; |
b5d38e9b | 482 | goto fail_cnt; |
896fc1f0 AV |
483 | } |
484 | ||
9ba80d99 | 485 | cxt->pstore.data = cxt; |
b5d38e9b | 486 | /* |
a384f641 AV |
487 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
488 | * have to handle dumps, we must have at least record_size buffer. And | |
489 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
490 | * ZERO_SIZE_PTR). | |
b5d38e9b | 491 | */ |
a384f641 AV |
492 | if (cxt->console_size) |
493 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
494 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 KC |
495 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
496 | spin_lock_init(&cxt->pstore.buf_lock); | |
497 | if (!cxt->pstore.buf) { | |
498 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 499 | err = -ENOMEM; |
9ba80d99 KC |
500 | goto fail_clear; |
501 | } | |
502 | ||
9ba80d99 | 503 | err = pstore_register(&cxt->pstore); |
56d611a0 | 504 | if (err) { |
9ba80d99 | 505 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 506 | goto fail_buf; |
56d611a0 MS |
507 | } |
508 | ||
c755201e KC |
509 | /* |
510 | * Update the module parameter variables as well so they are visible | |
511 | * through /sys/module/ramoops/parameters/ | |
512 | */ | |
513 | mem_size = pdata->mem_size; | |
514 | mem_address = pdata->mem_address; | |
515 | record_size = pdata->record_size; | |
516 | dump_oops = pdata->dump_oops; | |
517 | ||
c31ad081 | 518 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 519 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 520 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 521 | |
56d611a0 MS |
522 | return 0; |
523 | ||
9ba80d99 KC |
524 | fail_buf: |
525 | kfree(cxt->pstore.buf); | |
526 | fail_clear: | |
527 | cxt->pstore.bufsize = 0; | |
b5d38e9b | 528 | fail_cnt: |
a694d1b5 AV |
529 | kfree(cxt->fprz); |
530 | fail_init_fprz: | |
b5d38e9b AV |
531 | kfree(cxt->cprz); |
532 | fail_init_cprz: | |
f4c5d242 | 533 | ramoops_free_przs(cxt); |
9ba80d99 | 534 | fail_out: |
56d611a0 MS |
535 | return err; |
536 | } | |
537 | ||
c3b92ce9 | 538 | static int __exit ramoops_remove(struct platform_device *pdev) |
56d611a0 | 539 | { |
9ba80d99 KC |
540 | #if 0 |
541 | /* TODO(kees): We cannot unload ramoops since pstore doesn't support | |
542 | * unregistering yet. | |
543 | */ | |
56d611a0 MS |
544 | struct ramoops_context *cxt = &oops_cxt; |
545 | ||
56d611a0 MS |
546 | iounmap(cxt->virt_addr); |
547 | release_mem_region(cxt->phys_addr, cxt->size); | |
cac2eb7b | 548 | cxt->max_dump_cnt = 0; |
9ba80d99 KC |
549 | |
550 | /* TODO(kees): When pstore supports unregistering, call it here. */ | |
551 | kfree(cxt->pstore.buf); | |
552 | cxt->pstore.bufsize = 0; | |
553 | ||
c3b92ce9 | 554 | return 0; |
9ba80d99 KC |
555 | #endif |
556 | return -EBUSY; | |
56d611a0 MS |
557 | } |
558 | ||
c3b92ce9 | 559 | static struct platform_driver ramoops_driver = { |
924d3711 | 560 | .probe = ramoops_probe, |
c3b92ce9 KP |
561 | .remove = __exit_p(ramoops_remove), |
562 | .driver = { | |
563 | .name = "ramoops", | |
c3b92ce9 KP |
564 | }, |
565 | }; | |
566 | ||
924d3711 | 567 | static void ramoops_register_dummy(void) |
c3b92ce9 | 568 | { |
924d3711 AV |
569 | if (!mem_size) |
570 | return; | |
571 | ||
572 | pr_info("using module parameters\n"); | |
573 | ||
574 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
575 | if (!dummy_data) { | |
576 | pr_info("could not allocate pdata\n"); | |
577 | return; | |
13aefd72 MS |
578 | } |
579 | ||
924d3711 AV |
580 | dummy_data->mem_size = mem_size; |
581 | dummy_data->mem_address = mem_address; | |
027bc8b0 | 582 | dummy_data->mem_type = 0; |
924d3711 AV |
583 | dummy_data->record_size = record_size; |
584 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 585 | dummy_data->ftrace_size = ramoops_ftrace_size; |
924d3711 | 586 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
587 | /* |
588 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
589 | * (using 1 byte for ECC isn't much of use anyway). | |
590 | */ | |
c31ad081 | 591 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
592 | |
593 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
594 | dummy_data, sizeof(struct ramoops_platform_data)); | |
595 | if (IS_ERR(dummy)) { | |
596 | pr_info("could not create platform device: %ld\n", | |
597 | PTR_ERR(dummy)); | |
598 | } | |
599 | } | |
600 | ||
601 | static int __init ramoops_init(void) | |
602 | { | |
603 | ramoops_register_dummy(); | |
604 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 605 | } |
924d3711 | 606 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
607 | |
608 | static void __exit ramoops_exit(void) | |
609 | { | |
610 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 611 | platform_device_unregister(dummy); |
13aefd72 | 612 | kfree(dummy_data); |
c3b92ce9 | 613 | } |
56d611a0 MS |
614 | module_exit(ramoops_exit); |
615 | ||
616 | MODULE_LICENSE("GPL"); | |
617 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
618 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |