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