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 | ||
9d5438f4 MS |
54 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
55 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
56 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
57 | ||
56d611a0 MS |
58 | static ulong mem_address; |
59 | module_param(mem_address, ulong, 0400); | |
60 | MODULE_PARM_DESC(mem_address, | |
61 | "start of reserved RAM used to store oops/panic logs"); | |
62 | ||
63 | static ulong mem_size; | |
64 | module_param(mem_size, ulong, 0400); | |
65 | MODULE_PARM_DESC(mem_size, | |
66 | "size of reserved RAM used to store oops/panic logs"); | |
67 | ||
027bc8b0 TL |
68 | static unsigned int mem_type; |
69 | module_param(mem_type, uint, 0600); | |
70 | MODULE_PARM_DESC(mem_type, | |
71 | "set to 1 to try to use unbuffered memory (default 0)"); | |
72 | ||
56d611a0 MS |
73 | static int dump_oops = 1; |
74 | module_param(dump_oops, int, 0600); | |
75 | MODULE_PARM_DESC(dump_oops, | |
76 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
77 | ||
39eb7e97 AV |
78 | static int ramoops_ecc; |
79 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
80 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
81 | "if non-zero, the option enables ECC support and specifies " |
82 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
83 | "bytes ECC)"); | |
39eb7e97 | 84 | |
9ba80d99 | 85 | struct ramoops_context { |
896fc1f0 | 86 | struct persistent_ram_zone **przs; |
b5d38e9b | 87 | struct persistent_ram_zone *cprz; |
a694d1b5 | 88 | struct persistent_ram_zone *fprz; |
9d5438f4 | 89 | struct persistent_ram_zone *mprz; |
56d611a0 MS |
90 | phys_addr_t phys_addr; |
91 | unsigned long size; | |
027bc8b0 | 92 | unsigned int memtype; |
9ba80d99 | 93 | size_t record_size; |
b5d38e9b | 94 | size_t console_size; |
a694d1b5 | 95 | size_t ftrace_size; |
9d5438f4 | 96 | size_t pmsg_size; |
6b4d2a27 | 97 | int dump_oops; |
c31ad081 | 98 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
99 | unsigned int max_dump_cnt; |
100 | unsigned int dump_write_cnt; | |
57fd8353 | 101 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 102 | unsigned int dump_read_cnt; |
b5d38e9b | 103 | unsigned int console_read_cnt; |
a694d1b5 | 104 | unsigned int ftrace_read_cnt; |
9d5438f4 | 105 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
106 | struct pstore_info pstore; |
107 | }; | |
56d611a0 | 108 | |
13aefd72 MS |
109 | static struct platform_device *dummy; |
110 | static struct ramoops_platform_data *dummy_data; | |
111 | ||
9ba80d99 KC |
112 | static int ramoops_pstore_open(struct pstore_info *psi) |
113 | { | |
114 | struct ramoops_context *cxt = psi->data; | |
115 | ||
cac2eb7b | 116 | cxt->dump_read_cnt = 0; |
b5d38e9b | 117 | cxt->console_read_cnt = 0; |
57fd8353 | 118 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 119 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
120 | return 0; |
121 | } | |
122 | ||
755d66b4 AV |
123 | static struct persistent_ram_zone * |
124 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
125 | u64 *id, | |
126 | enum pstore_type_id *typep, enum pstore_type_id type, | |
127 | bool update) | |
128 | { | |
129 | struct persistent_ram_zone *prz; | |
130 | int i = (*c)++; | |
131 | ||
132 | if (i >= max) | |
133 | return NULL; | |
134 | ||
135 | prz = przs[i]; | |
b0aa931f LS |
136 | if (!prz) |
137 | return NULL; | |
755d66b4 | 138 | |
aa9a4a1e LS |
139 | /* Update old/shadowed buffer. */ |
140 | if (update) | |
755d66b4 | 141 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
142 | |
143 | if (!persistent_ram_old_size(prz)) | |
144 | return NULL; | |
755d66b4 AV |
145 | |
146 | *typep = type; | |
147 | *id = i; | |
148 | ||
149 | return prz; | |
150 | } | |
151 | ||
a28726b4 | 152 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
3f8f80f0 AB |
153 | bool *compressed) |
154 | { | |
155 | char data_type; | |
a28726b4 | 156 | int header_length = 0; |
3f8f80f0 | 157 | |
a28726b4 BZ |
158 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
159 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
3f8f80f0 AB |
160 | if (data_type == 'C') |
161 | *compressed = true; | |
162 | else | |
163 | *compressed = false; | |
a28726b4 BZ |
164 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
165 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
3f8f80f0 AB |
166 | *compressed = false; |
167 | } else { | |
168 | time->tv_sec = 0; | |
169 | time->tv_nsec = 0; | |
170 | *compressed = false; | |
171 | } | |
a28726b4 | 172 | return header_length; |
3f8f80f0 AB |
173 | } |
174 | ||
f44f9652 MS |
175 | static bool prz_ok(struct persistent_ram_zone *prz) |
176 | { | |
177 | return !!prz && !!(persistent_ram_old_size(prz) + | |
178 | persistent_ram_ecc_string(prz, NULL, 0)); | |
179 | } | |
180 | ||
9ba80d99 | 181 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 | 182 | int *count, struct timespec *time, |
9a4e1398 AB |
183 | char **buf, bool *compressed, |
184 | struct pstore_info *psi) | |
56d611a0 | 185 | { |
9ba80d99 | 186 | ssize_t size; |
bd08ec33 | 187 | ssize_t ecc_notice_size; |
9ba80d99 | 188 | struct ramoops_context *cxt = psi->data; |
e036bd33 BZ |
189 | struct persistent_ram_zone *prz = NULL; |
190 | int header_length = 0; | |
191 | ||
192 | /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
193 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have | |
194 | * valid time stamps, so it is initialized to zero. | |
195 | */ | |
196 | time->tv_sec = 0; | |
197 | time->tv_nsec = 0; | |
198 | *compressed = false; | |
199 | ||
200 | /* Find the next valid persistent_ram_zone for DMESG */ | |
201 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
202 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, | |
203 | cxt->max_dump_cnt, id, type, | |
204 | PSTORE_TYPE_DMESG, 1); | |
205 | if (!prz_ok(prz)) | |
206 | continue; | |
207 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
208 | time, compressed); | |
209 | /* Clear and skip this DMESG record if it has no valid header */ | |
210 | if (!header_length) { | |
211 | persistent_ram_free_old(prz); | |
212 | persistent_ram_zap(prz); | |
213 | prz = NULL; | |
214 | } | |
215 | } | |
9ba80d99 | 216 | |
f44f9652 | 217 | if (!prz_ok(prz)) |
b5d38e9b AV |
218 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
219 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
f44f9652 | 220 | if (!prz_ok(prz)) |
a694d1b5 AV |
221 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, |
222 | 1, id, type, PSTORE_TYPE_FTRACE, 0); | |
9d5438f4 MS |
223 | if (!prz_ok(prz)) |
224 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, | |
225 | 1, id, type, PSTORE_TYPE_PMSG, 0); | |
f44f9652 | 226 | if (!prz_ok(prz)) |
755d66b4 | 227 | return 0; |
896fc1f0 | 228 | |
e036bd33 | 229 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
230 | |
231 | /* ECC correction notice */ | |
232 | ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); | |
233 | ||
234 | *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL); | |
9ba80d99 KC |
235 | if (*buf == NULL) |
236 | return -ENOMEM; | |
9ba80d99 | 237 | |
a28726b4 | 238 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); |
bd08ec33 AH |
239 | persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1); |
240 | ||
241 | return size + ecc_notice_size; | |
9ba80d99 KC |
242 | } |
243 | ||
3f8f80f0 AB |
244 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
245 | bool compressed) | |
896fc1f0 AV |
246 | { |
247 | char *hdr; | |
1e817fb6 | 248 | struct timespec timestamp; |
896fc1f0 AV |
249 | size_t len; |
250 | ||
1e817fb6 KC |
251 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
252 | if (__getnstimeofday(×tamp)) { | |
253 | timestamp.tv_sec = 0; | |
254 | timestamp.tv_nsec = 0; | |
255 | } | |
3f8f80f0 AB |
256 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
257 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
258 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
259 | WARN_ON_ONCE(!hdr); |
260 | len = hdr ? strlen(hdr) : 0; | |
261 | persistent_ram_write(prz, hdr, len); | |
262 | kfree(hdr); | |
263 | ||
264 | return len; | |
265 | } | |
266 | ||
24203036 AV |
267 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
268 | enum kmsg_dump_reason reason, | |
269 | u64 *id, unsigned int part, | |
6bbbca73 | 270 | const char *buf, |
b3b515bb | 271 | bool compressed, size_t size, |
24203036 | 272 | struct pstore_info *psi) |
9ba80d99 | 273 | { |
9ba80d99 | 274 | struct ramoops_context *cxt = psi->data; |
c6289378 | 275 | struct persistent_ram_zone *prz; |
896fc1f0 | 276 | size_t hlen; |
9ba80d99 | 277 | |
b5d38e9b AV |
278 | if (type == PSTORE_TYPE_CONSOLE) { |
279 | if (!cxt->cprz) | |
280 | return -ENOMEM; | |
c2b71132 | 281 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 282 | return 0; |
a694d1b5 AV |
283 | } else if (type == PSTORE_TYPE_FTRACE) { |
284 | if (!cxt->fprz) | |
285 | return -ENOMEM; | |
286 | persistent_ram_write(cxt->fprz, buf, size); | |
287 | return 0; | |
9d5438f4 MS |
288 | } else if (type == PSTORE_TYPE_PMSG) { |
289 | if (!cxt->mprz) | |
290 | return -ENOMEM; | |
291 | persistent_ram_write(cxt->mprz, buf, size); | |
292 | return 0; | |
b5d38e9b AV |
293 | } |
294 | ||
9ba80d99 KC |
295 | if (type != PSTORE_TYPE_DMESG) |
296 | return -EINVAL; | |
56d611a0 | 297 | |
9ba80d99 KC |
298 | /* Out of the various dmesg dump types, ramoops is currently designed |
299 | * to only store crash logs, rather than storing general kernel logs. | |
300 | */ | |
fc2d557c | 301 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 302 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 303 | return -EINVAL; |
fc2d557c | 304 | |
9ba80d99 | 305 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 306 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
307 | return -EINVAL; |
308 | ||
309 | /* Explicitly only take the first part of any new crash. | |
310 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
311 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
312 | * report split across multiple records. | |
313 | */ | |
314 | if (part != 1) | |
315 | return -ENOSPC; | |
56d611a0 | 316 | |
c6289378 AH |
317 | if (!cxt->przs) |
318 | return -ENOSPC; | |
319 | ||
320 | prz = cxt->przs[cxt->dump_write_cnt]; | |
321 | ||
3f8f80f0 | 322 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
896fc1f0 AV |
323 | if (size + hlen > prz->buffer_size) |
324 | size = prz->buffer_size - hlen; | |
c2b71132 | 325 | persistent_ram_write(prz, buf, size); |
56d611a0 | 326 | |
cac2eb7b | 327 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
328 | |
329 | return 0; | |
330 | } | |
331 | ||
755d4fe4 | 332 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 333 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 334 | { |
9ba80d99 | 335 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 336 | struct persistent_ram_zone *prz; |
9ba80d99 | 337 | |
b5d38e9b AV |
338 | switch (type) { |
339 | case PSTORE_TYPE_DMESG: | |
340 | if (id >= cxt->max_dump_cnt) | |
341 | return -EINVAL; | |
342 | prz = cxt->przs[id]; | |
343 | break; | |
344 | case PSTORE_TYPE_CONSOLE: | |
345 | prz = cxt->cprz; | |
346 | break; | |
a694d1b5 AV |
347 | case PSTORE_TYPE_FTRACE: |
348 | prz = cxt->fprz; | |
349 | break; | |
9d5438f4 MS |
350 | case PSTORE_TYPE_PMSG: |
351 | prz = cxt->mprz; | |
352 | break; | |
b5d38e9b | 353 | default: |
9ba80d99 | 354 | return -EINVAL; |
b5d38e9b | 355 | } |
9ba80d99 | 356 | |
b5d38e9b AV |
357 | persistent_ram_free_old(prz); |
358 | persistent_ram_zap(prz); | |
9ba80d99 KC |
359 | |
360 | return 0; | |
56d611a0 MS |
361 | } |
362 | ||
9ba80d99 KC |
363 | static struct ramoops_context oops_cxt = { |
364 | .pstore = { | |
365 | .owner = THIS_MODULE, | |
366 | .name = "ramoops", | |
367 | .open = ramoops_pstore_open, | |
368 | .read = ramoops_pstore_read, | |
c2b71132 | 369 | .write_buf = ramoops_pstore_write_buf, |
9ba80d99 KC |
370 | .erase = ramoops_pstore_erase, |
371 | }, | |
372 | }; | |
373 | ||
f4c5d242 AV |
374 | static void ramoops_free_przs(struct ramoops_context *cxt) |
375 | { | |
376 | int i; | |
377 | ||
34f0ec82 | 378 | cxt->max_dump_cnt = 0; |
f4c5d242 AV |
379 | if (!cxt->przs) |
380 | return; | |
381 | ||
90b58d96 | 382 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
383 | persistent_ram_free(cxt->przs[i]); |
384 | kfree(cxt->przs); | |
385 | } | |
386 | ||
f568f6ca GKH |
387 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
388 | phys_addr_t *paddr, size_t dump_mem_sz) | |
f4c5d242 AV |
389 | { |
390 | int err = -ENOMEM; | |
391 | int i; | |
392 | ||
393 | if (!cxt->record_size) | |
394 | return 0; | |
395 | ||
c6289378 AH |
396 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
397 | dev_err(dev, "no room for dumps\n"); | |
398 | return -ENOMEM; | |
399 | } | |
400 | ||
f4c5d242 AV |
401 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
402 | if (!cxt->max_dump_cnt) | |
403 | return -ENOMEM; | |
404 | ||
405 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
406 | GFP_KERNEL); | |
407 | if (!cxt->przs) { | |
408 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
34f0ec82 | 409 | goto fail_prz; |
f4c5d242 AV |
410 | } |
411 | ||
412 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
07239fc8 | 413 | cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0, |
027bc8b0 TL |
414 | &cxt->ecc_info, |
415 | cxt->memtype); | |
f4c5d242 AV |
416 | if (IS_ERR(cxt->przs[i])) { |
417 | err = PTR_ERR(cxt->przs[i]); | |
418 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
07239fc8 | 419 | cxt->record_size, (unsigned long long)*paddr, err); |
f4c5d242 AV |
420 | goto fail_prz; |
421 | } | |
07239fc8 | 422 | *paddr += cxt->record_size; |
f4c5d242 AV |
423 | } |
424 | ||
425 | return 0; | |
426 | fail_prz: | |
427 | ramoops_free_przs(cxt); | |
428 | return err; | |
429 | } | |
430 | ||
f568f6ca GKH |
431 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
432 | struct persistent_ram_zone **prz, | |
433 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
434 | { |
435 | if (!sz) | |
436 | return 0; | |
437 | ||
c6289378 AH |
438 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
439 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
440 | sz, (unsigned long long)*paddr, | |
441 | cxt->size, (unsigned long long)cxt->phys_addr); | |
b5d38e9b | 442 | return -ENOMEM; |
c6289378 | 443 | } |
b5d38e9b | 444 | |
027bc8b0 | 445 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype); |
b5d38e9b AV |
446 | if (IS_ERR(*prz)) { |
447 | int err = PTR_ERR(*prz); | |
448 | ||
449 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
450 | sz, (unsigned long long)*paddr, err); | |
451 | return err; | |
452 | } | |
453 | ||
454 | persistent_ram_zap(*prz); | |
455 | ||
456 | *paddr += sz; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
f568f6ca | 461 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 462 | { |
896fc1f0 | 463 | struct device *dev = &pdev->dev; |
c3b92ce9 | 464 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 | 465 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
466 | size_t dump_mem_sz; |
467 | phys_addr_t paddr; | |
56d611a0 MS |
468 | int err = -EINVAL; |
469 | ||
9ba80d99 KC |
470 | /* Only a single ramoops area allowed at a time, so fail extra |
471 | * probes. | |
472 | */ | |
cac2eb7b | 473 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
474 | goto fail_out; |
475 | ||
a694d1b5 | 476 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 477 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 478 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 479 | "non-zero\n"); |
9ba80d99 | 480 | goto fail_out; |
56d611a0 MS |
481 | } |
482 | ||
3bd11cf5 | 483 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 484 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 485 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 486 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 487 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 488 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
489 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
490 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 491 | |
13aefd72 MS |
492 | cxt->size = pdata->mem_size; |
493 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 494 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 495 | cxt->record_size = pdata->record_size; |
b5d38e9b | 496 | cxt->console_size = pdata->console_size; |
a694d1b5 | 497 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 498 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 499 | cxt->dump_oops = pdata->dump_oops; |
c31ad081 | 500 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 501 | |
f4c5d242 | 502 | paddr = cxt->phys_addr; |
896fc1f0 | 503 | |
9d5438f4 MS |
504 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
505 | - cxt->pmsg_size; | |
f4c5d242 | 506 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
507 | if (err) |
508 | goto fail_out; | |
509 | ||
cbe7cbf5 AV |
510 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
511 | cxt->console_size, 0); | |
b5d38e9b AV |
512 | if (err) |
513 | goto fail_init_cprz; | |
514 | ||
cbe7cbf5 AV |
515 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
516 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
517 | if (err) |
518 | goto fail_init_fprz; | |
519 | ||
9d5438f4 MS |
520 | err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0); |
521 | if (err) | |
522 | goto fail_init_mprz; | |
523 | ||
9ba80d99 | 524 | cxt->pstore.data = cxt; |
b5d38e9b | 525 | /* |
a384f641 AV |
526 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
527 | * have to handle dumps, we must have at least record_size buffer. And | |
528 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
529 | * ZERO_SIZE_PTR). | |
b5d38e9b | 530 | */ |
a384f641 AV |
531 | if (cxt->console_size) |
532 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
533 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 KC |
534 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
535 | spin_lock_init(&cxt->pstore.buf_lock); | |
536 | if (!cxt->pstore.buf) { | |
537 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 538 | err = -ENOMEM; |
9ba80d99 KC |
539 | goto fail_clear; |
540 | } | |
541 | ||
9ba80d99 | 542 | err = pstore_register(&cxt->pstore); |
56d611a0 | 543 | if (err) { |
9ba80d99 | 544 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 545 | goto fail_buf; |
56d611a0 MS |
546 | } |
547 | ||
c755201e KC |
548 | /* |
549 | * Update the module parameter variables as well so they are visible | |
550 | * through /sys/module/ramoops/parameters/ | |
551 | */ | |
552 | mem_size = pdata->mem_size; | |
553 | mem_address = pdata->mem_address; | |
554 | record_size = pdata->record_size; | |
555 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
556 | ramoops_console_size = pdata->console_size; |
557 | ramoops_pmsg_size = pdata->pmsg_size; | |
558 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 559 | |
c31ad081 | 560 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 561 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 562 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 563 | |
56d611a0 MS |
564 | return 0; |
565 | ||
9ba80d99 KC |
566 | fail_buf: |
567 | kfree(cxt->pstore.buf); | |
568 | fail_clear: | |
569 | cxt->pstore.bufsize = 0; | |
9d5438f4 MS |
570 | kfree(cxt->mprz); |
571 | fail_init_mprz: | |
a694d1b5 AV |
572 | kfree(cxt->fprz); |
573 | fail_init_fprz: | |
b5d38e9b AV |
574 | kfree(cxt->cprz); |
575 | fail_init_cprz: | |
f4c5d242 | 576 | ramoops_free_przs(cxt); |
9ba80d99 | 577 | fail_out: |
56d611a0 MS |
578 | return err; |
579 | } | |
580 | ||
ee1d2674 | 581 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
582 | { |
583 | struct ramoops_context *cxt = &oops_cxt; | |
584 | ||
ee1d2674 | 585 | pstore_unregister(&cxt->pstore); |
cac2eb7b | 586 | cxt->max_dump_cnt = 0; |
9ba80d99 | 587 | |
9ba80d99 KC |
588 | kfree(cxt->pstore.buf); |
589 | cxt->pstore.bufsize = 0; | |
590 | ||
ee1d2674 GT |
591 | persistent_ram_free(cxt->mprz); |
592 | persistent_ram_free(cxt->fprz); | |
593 | persistent_ram_free(cxt->cprz); | |
594 | ramoops_free_przs(cxt); | |
595 | ||
c3b92ce9 | 596 | return 0; |
56d611a0 MS |
597 | } |
598 | ||
c3b92ce9 | 599 | static struct platform_driver ramoops_driver = { |
924d3711 | 600 | .probe = ramoops_probe, |
ee1d2674 | 601 | .remove = ramoops_remove, |
c3b92ce9 KP |
602 | .driver = { |
603 | .name = "ramoops", | |
c3b92ce9 KP |
604 | }, |
605 | }; | |
606 | ||
924d3711 | 607 | static void ramoops_register_dummy(void) |
c3b92ce9 | 608 | { |
924d3711 AV |
609 | if (!mem_size) |
610 | return; | |
611 | ||
612 | pr_info("using module parameters\n"); | |
613 | ||
614 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
615 | if (!dummy_data) { | |
616 | pr_info("could not allocate pdata\n"); | |
617 | return; | |
13aefd72 MS |
618 | } |
619 | ||
924d3711 AV |
620 | dummy_data->mem_size = mem_size; |
621 | dummy_data->mem_address = mem_address; | |
07855056 | 622 | dummy_data->mem_type = mem_type; |
924d3711 AV |
623 | dummy_data->record_size = record_size; |
624 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 625 | dummy_data->ftrace_size = ramoops_ftrace_size; |
9d5438f4 | 626 | dummy_data->pmsg_size = ramoops_pmsg_size; |
924d3711 | 627 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
628 | /* |
629 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
630 | * (using 1 byte for ECC isn't much of use anyway). | |
631 | */ | |
c31ad081 | 632 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
633 | |
634 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
635 | dummy_data, sizeof(struct ramoops_platform_data)); | |
636 | if (IS_ERR(dummy)) { | |
637 | pr_info("could not create platform device: %ld\n", | |
638 | PTR_ERR(dummy)); | |
639 | } | |
640 | } | |
641 | ||
642 | static int __init ramoops_init(void) | |
643 | { | |
644 | ramoops_register_dummy(); | |
645 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 646 | } |
924d3711 | 647 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
648 | |
649 | static void __exit ramoops_exit(void) | |
650 | { | |
651 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 652 | platform_device_unregister(dummy); |
13aefd72 | 653 | kfree(dummy_data); |
c3b92ce9 | 654 | } |
56d611a0 MS |
655 | module_exit(ramoops_exit); |
656 | ||
657 | MODULE_LICENSE("GPL"); | |
658 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
659 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |