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