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1 | /* | |
2 | * RAM Oops/Panic logger | |
3 | * | |
4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
5 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> | |
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 | ||
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/err.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/version.h> | |
29 | #include <linux/pstore.h> | |
30 | #include <linux/time.h> | |
31 | #include <linux/io.h> | |
32 | #include <linux/ioport.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/compiler.h> | |
36 | #include <linux/pstore_ram.h> | |
37 | #include <linux/of.h> | |
38 | #include <linux/of_address.h> | |
39 | ||
40 | #define RAMOOPS_KERNMSG_HDR "====" | |
41 | #define MIN_MEM_SIZE 4096UL | |
42 | ||
43 | static ulong record_size = MIN_MEM_SIZE; | |
44 | module_param(record_size, ulong, 0400); | |
45 | MODULE_PARM_DESC(record_size, | |
46 | "size of each dump done on oops/panic"); | |
47 | ||
48 | static ulong ramoops_console_size = MIN_MEM_SIZE; | |
49 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
50 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
51 | ||
52 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; | |
53 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
54 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
55 | ||
56 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; | |
57 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
58 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
59 | ||
60 | static unsigned long long mem_address; | |
61 | module_param(mem_address, ullong, 0400); | |
62 | MODULE_PARM_DESC(mem_address, | |
63 | "start of reserved RAM used to store oops/panic logs"); | |
64 | ||
65 | static ulong mem_size; | |
66 | module_param(mem_size, ulong, 0400); | |
67 | MODULE_PARM_DESC(mem_size, | |
68 | "size of reserved RAM used to store oops/panic logs"); | |
69 | ||
70 | static unsigned int mem_type; | |
71 | module_param(mem_type, uint, 0600); | |
72 | MODULE_PARM_DESC(mem_type, | |
73 | "set to 1 to try to use unbuffered memory (default 0)"); | |
74 | ||
75 | static int dump_oops = 1; | |
76 | module_param(dump_oops, int, 0600); | |
77 | MODULE_PARM_DESC(dump_oops, | |
78 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
79 | ||
80 | static int ramoops_ecc; | |
81 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
82 | MODULE_PARM_DESC(ramoops_ecc, | |
83 | "if non-zero, the option enables ECC support and specifies " | |
84 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
85 | "bytes ECC)"); | |
86 | ||
87 | struct ramoops_context { | |
88 | struct persistent_ram_zone **przs; | |
89 | struct persistent_ram_zone *cprz; | |
90 | struct persistent_ram_zone **fprzs; | |
91 | struct persistent_ram_zone *mprz; | |
92 | phys_addr_t phys_addr; | |
93 | unsigned long size; | |
94 | unsigned int memtype; | |
95 | size_t record_size; | |
96 | size_t console_size; | |
97 | size_t ftrace_size; | |
98 | size_t pmsg_size; | |
99 | int dump_oops; | |
100 | u32 flags; | |
101 | struct persistent_ram_ecc_info ecc_info; | |
102 | unsigned int max_dump_cnt; | |
103 | unsigned int dump_write_cnt; | |
104 | /* _read_cnt need clear on ramoops_pstore_open */ | |
105 | unsigned int dump_read_cnt; | |
106 | unsigned int console_read_cnt; | |
107 | unsigned int max_ftrace_cnt; | |
108 | unsigned int ftrace_read_cnt; | |
109 | unsigned int pmsg_read_cnt; | |
110 | struct pstore_info pstore; | |
111 | }; | |
112 | ||
113 | static struct platform_device *dummy; | |
114 | static struct ramoops_platform_data *dummy_data; | |
115 | ||
116 | static int ramoops_pstore_open(struct pstore_info *psi) | |
117 | { | |
118 | struct ramoops_context *cxt = psi->data; | |
119 | ||
120 | cxt->dump_read_cnt = 0; | |
121 | cxt->console_read_cnt = 0; | |
122 | cxt->ftrace_read_cnt = 0; | |
123 | cxt->pmsg_read_cnt = 0; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static struct persistent_ram_zone * | |
128 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
129 | u64 *id, | |
130 | enum pstore_type_id *typep, enum pstore_type_id type, | |
131 | bool update) | |
132 | { | |
133 | struct persistent_ram_zone *prz; | |
134 | int i = (*c)++; | |
135 | ||
136 | if (i >= max) | |
137 | return NULL; | |
138 | ||
139 | prz = przs[i]; | |
140 | if (!prz) | |
141 | return NULL; | |
142 | ||
143 | /* Update old/shadowed buffer. */ | |
144 | if (update) | |
145 | persistent_ram_save_old(prz); | |
146 | ||
147 | if (!persistent_ram_old_size(prz)) | |
148 | return NULL; | |
149 | ||
150 | *typep = type; | |
151 | *id = i; | |
152 | ||
153 | return prz; | |
154 | } | |
155 | ||
156 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, | |
157 | bool *compressed) | |
158 | { | |
159 | char data_type; | |
160 | int header_length = 0; | |
161 | ||
162 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, | |
163 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
164 | if (data_type == 'C') | |
165 | *compressed = true; | |
166 | else | |
167 | *compressed = false; | |
168 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", | |
169 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
170 | *compressed = false; | |
171 | } else { | |
172 | time->tv_sec = 0; | |
173 | time->tv_nsec = 0; | |
174 | *compressed = false; | |
175 | } | |
176 | return header_length; | |
177 | } | |
178 | ||
179 | static bool prz_ok(struct persistent_ram_zone *prz) | |
180 | { | |
181 | return !!prz && !!(persistent_ram_old_size(prz) + | |
182 | persistent_ram_ecc_string(prz, NULL, 0)); | |
183 | } | |
184 | ||
185 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, | |
186 | struct persistent_ram_zone *src) | |
187 | { | |
188 | size_t dest_size, src_size, total, dest_off, src_off; | |
189 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
190 | void *merged_buf; | |
191 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
192 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
193 | ||
194 | dest_off = dest->old_log_size % record_size; | |
195 | dest_size = dest->old_log_size - dest_off; | |
196 | ||
197 | src_off = src->old_log_size % record_size; | |
198 | src_size = src->old_log_size - src_off; | |
199 | ||
200 | total = dest_size + src_size; | |
201 | merged_buf = kmalloc(total, GFP_KERNEL); | |
202 | if (!merged_buf) | |
203 | return -ENOMEM; | |
204 | ||
205 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
206 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
207 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
208 | ||
209 | while (dest_size > 0 && src_size > 0) { | |
210 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
211 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
212 | mrec[merged_idx++] = drec[dest_idx++]; | |
213 | dest_size -= record_size; | |
214 | } else { | |
215 | mrec[merged_idx++] = srec[src_idx++]; | |
216 | src_size -= record_size; | |
217 | } | |
218 | } | |
219 | ||
220 | while (dest_size > 0) { | |
221 | mrec[merged_idx++] = drec[dest_idx++]; | |
222 | dest_size -= record_size; | |
223 | } | |
224 | ||
225 | while (src_size > 0) { | |
226 | mrec[merged_idx++] = srec[src_idx++]; | |
227 | src_size -= record_size; | |
228 | } | |
229 | ||
230 | kfree(dest->old_log); | |
231 | dest->old_log = merged_buf; | |
232 | dest->old_log_size = total; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, | |
238 | int *count, struct timespec *time, | |
239 | char **buf, bool *compressed, | |
240 | ssize_t *ecc_notice_size, | |
241 | struct pstore_info *psi) | |
242 | { | |
243 | ssize_t size = 0; | |
244 | struct ramoops_context *cxt = psi->data; | |
245 | struct persistent_ram_zone *prz = NULL; | |
246 | int header_length = 0; | |
247 | bool free_prz = false; | |
248 | ||
249 | /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
250 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have | |
251 | * valid time stamps, so it is initialized to zero. | |
252 | */ | |
253 | time->tv_sec = 0; | |
254 | time->tv_nsec = 0; | |
255 | *compressed = false; | |
256 | ||
257 | /* Find the next valid persistent_ram_zone for DMESG */ | |
258 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
259 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, | |
260 | cxt->max_dump_cnt, id, type, | |
261 | PSTORE_TYPE_DMESG, 1); | |
262 | if (!prz_ok(prz)) | |
263 | continue; | |
264 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
265 | time, compressed); | |
266 | /* Clear and skip this DMESG record if it has no valid header */ | |
267 | if (!header_length) { | |
268 | persistent_ram_free_old(prz); | |
269 | persistent_ram_zap(prz); | |
270 | prz = NULL; | |
271 | } | |
272 | } | |
273 | ||
274 | if (!prz_ok(prz)) | |
275 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, | |
276 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
277 | ||
278 | if (!prz_ok(prz)) | |
279 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, | |
280 | 1, id, type, PSTORE_TYPE_PMSG, 0); | |
281 | ||
282 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
283 | if (!prz_ok(prz)) { | |
284 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) { | |
285 | prz = ramoops_get_next_prz(cxt->fprzs, | |
286 | &cxt->ftrace_read_cnt, 1, id, type, | |
287 | PSTORE_TYPE_FTRACE, 0); | |
288 | } else { | |
289 | /* | |
290 | * Build a new dummy record which combines all the | |
291 | * per-cpu records including metadata and ecc info. | |
292 | */ | |
293 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
294 | ||
295 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
296 | GFP_KERNEL); | |
297 | if (!tmp_prz) | |
298 | return -ENOMEM; | |
299 | free_prz = true; | |
300 | ||
301 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
302 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
303 | &cxt->ftrace_read_cnt, | |
304 | cxt->max_ftrace_cnt, id, | |
305 | type, PSTORE_TYPE_FTRACE, 0); | |
306 | ||
307 | if (!prz_ok(prz_next)) | |
308 | continue; | |
309 | ||
310 | tmp_prz->ecc_info = prz_next->ecc_info; | |
311 | tmp_prz->corrected_bytes += | |
312 | prz_next->corrected_bytes; | |
313 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
314 | size = ftrace_log_combine(tmp_prz, prz_next); | |
315 | if (size) | |
316 | goto out; | |
317 | } | |
318 | *id = 0; | |
319 | prz = tmp_prz; | |
320 | } | |
321 | } | |
322 | ||
323 | if (!prz_ok(prz)) { | |
324 | size = 0; | |
325 | goto out; | |
326 | } | |
327 | ||
328 | size = persistent_ram_old_size(prz) - header_length; | |
329 | ||
330 | /* ECC correction notice */ | |
331 | *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); | |
332 | ||
333 | *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL); | |
334 | if (*buf == NULL) { | |
335 | size = -ENOMEM; | |
336 | goto out; | |
337 | } | |
338 | ||
339 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); | |
340 | ||
341 | persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1); | |
342 | ||
343 | out: | |
344 | if (free_prz) { | |
345 | kfree(prz->old_log); | |
346 | kfree(prz); | |
347 | } | |
348 | ||
349 | return size; | |
350 | } | |
351 | ||
352 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, | |
353 | bool compressed) | |
354 | { | |
355 | char *hdr; | |
356 | struct timespec timestamp; | |
357 | size_t len; | |
358 | ||
359 | /* Report zeroed timestamp if called before timekeeping has resumed. */ | |
360 | if (__getnstimeofday(×tamp)) { | |
361 | timestamp.tv_sec = 0; | |
362 | timestamp.tv_nsec = 0; | |
363 | } | |
364 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", | |
365 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
366 | compressed ? 'C' : 'D'); | |
367 | WARN_ON_ONCE(!hdr); | |
368 | len = hdr ? strlen(hdr) : 0; | |
369 | persistent_ram_write(prz, hdr, len); | |
370 | kfree(hdr); | |
371 | ||
372 | return len; | |
373 | } | |
374 | ||
375 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, | |
376 | enum kmsg_dump_reason reason, | |
377 | u64 *id, unsigned int part, | |
378 | const char *buf, | |
379 | bool compressed, size_t size, | |
380 | struct pstore_info *psi) | |
381 | { | |
382 | struct ramoops_context *cxt = psi->data; | |
383 | struct persistent_ram_zone *prz; | |
384 | size_t hlen; | |
385 | ||
386 | if (type == PSTORE_TYPE_CONSOLE) { | |
387 | if (!cxt->cprz) | |
388 | return -ENOMEM; | |
389 | persistent_ram_write(cxt->cprz, buf, size); | |
390 | return 0; | |
391 | } else if (type == PSTORE_TYPE_FTRACE) { | |
392 | int zonenum; | |
393 | ||
394 | if (!cxt->fprzs) | |
395 | return -ENOMEM; | |
396 | /* | |
397 | * Choose zone by if we're using per-cpu buffers. | |
398 | */ | |
399 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
400 | zonenum = smp_processor_id(); | |
401 | else | |
402 | zonenum = 0; | |
403 | ||
404 | persistent_ram_write(cxt->fprzs[zonenum], buf, size); | |
405 | return 0; | |
406 | } else if (type == PSTORE_TYPE_PMSG) { | |
407 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); | |
408 | return -EINVAL; | |
409 | } | |
410 | ||
411 | if (type != PSTORE_TYPE_DMESG) | |
412 | return -EINVAL; | |
413 | ||
414 | /* Out of the various dmesg dump types, ramoops is currently designed | |
415 | * to only store crash logs, rather than storing general kernel logs. | |
416 | */ | |
417 | if (reason != KMSG_DUMP_OOPS && | |
418 | reason != KMSG_DUMP_PANIC) | |
419 | return -EINVAL; | |
420 | ||
421 | /* Skip Oopes when configured to do so. */ | |
422 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) | |
423 | return -EINVAL; | |
424 | ||
425 | /* Explicitly only take the first part of any new crash. | |
426 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
427 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
428 | * report split across multiple records. | |
429 | */ | |
430 | if (part != 1) | |
431 | return -ENOSPC; | |
432 | ||
433 | if (!cxt->przs) | |
434 | return -ENOSPC; | |
435 | ||
436 | prz = cxt->przs[cxt->dump_write_cnt]; | |
437 | ||
438 | hlen = ramoops_write_kmsg_hdr(prz, compressed); | |
439 | if (size + hlen > prz->buffer_size) | |
440 | size = prz->buffer_size - hlen; | |
441 | persistent_ram_write(prz, buf, size); | |
442 | ||
443 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type, | |
449 | enum kmsg_dump_reason reason, | |
450 | u64 *id, unsigned int part, | |
451 | const char __user *buf, | |
452 | bool compressed, size_t size, | |
453 | struct pstore_info *psi) | |
454 | { | |
455 | if (type == PSTORE_TYPE_PMSG) { | |
456 | struct ramoops_context *cxt = psi->data; | |
457 | ||
458 | if (!cxt->mprz) | |
459 | return -ENOMEM; | |
460 | return persistent_ram_write_user(cxt->mprz, buf, size); | |
461 | } | |
462 | ||
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, | |
467 | struct timespec time, struct pstore_info *psi) | |
468 | { | |
469 | struct ramoops_context *cxt = psi->data; | |
470 | struct persistent_ram_zone *prz; | |
471 | ||
472 | switch (type) { | |
473 | case PSTORE_TYPE_DMESG: | |
474 | if (id >= cxt->max_dump_cnt) | |
475 | return -EINVAL; | |
476 | prz = cxt->przs[id]; | |
477 | break; | |
478 | case PSTORE_TYPE_CONSOLE: | |
479 | prz = cxt->cprz; | |
480 | break; | |
481 | case PSTORE_TYPE_FTRACE: | |
482 | if (id >= cxt->max_ftrace_cnt) | |
483 | return -EINVAL; | |
484 | prz = cxt->fprzs[id]; | |
485 | break; | |
486 | case PSTORE_TYPE_PMSG: | |
487 | prz = cxt->mprz; | |
488 | break; | |
489 | default: | |
490 | return -EINVAL; | |
491 | } | |
492 | ||
493 | persistent_ram_free_old(prz); | |
494 | persistent_ram_zap(prz); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static struct ramoops_context oops_cxt = { | |
500 | .pstore = { | |
501 | .owner = THIS_MODULE, | |
502 | .name = "ramoops", | |
503 | .open = ramoops_pstore_open, | |
504 | .read = ramoops_pstore_read, | |
505 | .write_buf = ramoops_pstore_write_buf, | |
506 | .write_buf_user = ramoops_pstore_write_buf_user, | |
507 | .erase = ramoops_pstore_erase, | |
508 | }, | |
509 | }; | |
510 | ||
511 | static void ramoops_free_przs(struct ramoops_context *cxt) | |
512 | { | |
513 | int i; | |
514 | ||
515 | /* Free dump PRZs */ | |
516 | if (cxt->przs) { | |
517 | for (i = 0; i < cxt->max_dump_cnt; i++) | |
518 | persistent_ram_free(cxt->przs[i]); | |
519 | ||
520 | kfree(cxt->przs); | |
521 | cxt->max_dump_cnt = 0; | |
522 | } | |
523 | ||
524 | /* Free ftrace PRZs */ | |
525 | if (cxt->fprzs) { | |
526 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
527 | persistent_ram_free(cxt->fprzs[i]); | |
528 | kfree(cxt->fprzs); | |
529 | cxt->max_ftrace_cnt = 0; | |
530 | } | |
531 | } | |
532 | ||
533 | static int ramoops_init_przs(const char *name, | |
534 | struct device *dev, struct ramoops_context *cxt, | |
535 | struct persistent_ram_zone ***przs, | |
536 | phys_addr_t *paddr, size_t mem_sz, | |
537 | ssize_t record_size, | |
538 | unsigned int *cnt, u32 sig, u32 flags) | |
539 | { | |
540 | int err = -ENOMEM; | |
541 | int i; | |
542 | size_t zone_sz; | |
543 | struct persistent_ram_zone **prz_ar; | |
544 | ||
545 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ | |
546 | if (mem_sz == 0 || record_size == 0) { | |
547 | *cnt = 0; | |
548 | return 0; | |
549 | } | |
550 | ||
551 | /* | |
552 | * If we have a negative record size, calculate it based on | |
553 | * mem_sz / *cnt. If we have a positive record size, calculate | |
554 | * cnt from mem_sz / record_size. | |
555 | */ | |
556 | if (record_size < 0) { | |
557 | if (*cnt == 0) | |
558 | return 0; | |
559 | record_size = mem_sz / *cnt; | |
560 | if (record_size == 0) { | |
561 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
562 | name, mem_sz, *cnt); | |
563 | goto fail; | |
564 | } | |
565 | } else { | |
566 | *cnt = mem_sz / record_size; | |
567 | if (*cnt == 0) { | |
568 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
569 | name, mem_sz, record_size); | |
570 | goto fail; | |
571 | } | |
572 | } | |
573 | ||
574 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { | |
575 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
576 | name, | |
577 | mem_sz, (unsigned long long)*paddr, | |
578 | cxt->size, (unsigned long long)cxt->phys_addr); | |
579 | goto fail; | |
580 | } | |
581 | ||
582 | zone_sz = mem_sz / *cnt; | |
583 | if (!zone_sz) { | |
584 | dev_err(dev, "%s zone size == 0\n", name); | |
585 | goto fail; | |
586 | } | |
587 | ||
588 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
589 | if (!prz_ar) | |
590 | goto fail; | |
591 | ||
592 | for (i = 0; i < *cnt; i++) { | |
593 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, | |
594 | &cxt->ecc_info, | |
595 | cxt->memtype, flags); | |
596 | if (IS_ERR(prz_ar[i])) { | |
597 | err = PTR_ERR(prz_ar[i]); | |
598 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", | |
599 | name, record_size, | |
600 | (unsigned long long)*paddr, err); | |
601 | ||
602 | while (i > 0) { | |
603 | i--; | |
604 | persistent_ram_free(prz_ar[i]); | |
605 | } | |
606 | kfree(prz_ar); | |
607 | goto fail; | |
608 | } | |
609 | *paddr += zone_sz; | |
610 | } | |
611 | ||
612 | *przs = prz_ar; | |
613 | return 0; | |
614 | ||
615 | fail: | |
616 | *cnt = 0; | |
617 | return err; | |
618 | } | |
619 | ||
620 | static int ramoops_init_prz(const char *name, | |
621 | struct device *dev, struct ramoops_context *cxt, | |
622 | struct persistent_ram_zone **prz, | |
623 | phys_addr_t *paddr, size_t sz, u32 sig) | |
624 | { | |
625 | if (!sz) | |
626 | return 0; | |
627 | ||
628 | if (*paddr + sz - cxt->phys_addr > cxt->size) { | |
629 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
630 | name, sz, (unsigned long long)*paddr, | |
631 | cxt->size, (unsigned long long)cxt->phys_addr); | |
632 | return -ENOMEM; | |
633 | } | |
634 | ||
635 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, | |
636 | cxt->memtype, 0); | |
637 | if (IS_ERR(*prz)) { | |
638 | int err = PTR_ERR(*prz); | |
639 | ||
640 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", | |
641 | name, sz, (unsigned long long)*paddr, err); | |
642 | return err; | |
643 | } | |
644 | ||
645 | persistent_ram_zap(*prz); | |
646 | ||
647 | *paddr += sz; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | static int ramoops_parse_dt_size(struct platform_device *pdev, | |
653 | const char *propname, u32 *value) | |
654 | { | |
655 | u32 val32 = 0; | |
656 | int ret; | |
657 | ||
658 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
659 | if (ret < 0 && ret != -EINVAL) { | |
660 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
661 | propname, ret); | |
662 | return ret; | |
663 | } | |
664 | ||
665 | if (val32 > INT_MAX) { | |
666 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
667 | return -EOVERFLOW; | |
668 | } | |
669 | ||
670 | *value = val32; | |
671 | return 0; | |
672 | } | |
673 | ||
674 | static int ramoops_parse_dt(struct platform_device *pdev, | |
675 | struct ramoops_platform_data *pdata) | |
676 | { | |
677 | struct device_node *of_node = pdev->dev.of_node; | |
678 | struct resource *res; | |
679 | u32 value; | |
680 | int ret; | |
681 | ||
682 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
683 | ||
684 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
685 | if (!res) { | |
686 | dev_err(&pdev->dev, | |
687 | "failed to locate DT /reserved-memory resource\n"); | |
688 | return -EINVAL; | |
689 | } | |
690 | ||
691 | pdata->mem_size = resource_size(res); | |
692 | pdata->mem_address = res->start; | |
693 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); | |
694 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
695 | ||
696 | #define parse_size(name, field) { \ | |
697 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
698 | if (ret < 0) \ | |
699 | return ret; \ | |
700 | field = value; \ | |
701 | } | |
702 | ||
703 | parse_size("record-size", pdata->record_size); | |
704 | parse_size("console-size", pdata->console_size); | |
705 | parse_size("ftrace-size", pdata->ftrace_size); | |
706 | parse_size("pmsg-size", pdata->pmsg_size); | |
707 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
708 | parse_size("flags", pdata->flags); | |
709 | ||
710 | #undef parse_size | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static int ramoops_probe(struct platform_device *pdev) | |
716 | { | |
717 | struct device *dev = &pdev->dev; | |
718 | struct ramoops_platform_data *pdata = dev->platform_data; | |
719 | struct ramoops_context *cxt = &oops_cxt; | |
720 | size_t dump_mem_sz; | |
721 | phys_addr_t paddr; | |
722 | int err = -EINVAL; | |
723 | ||
724 | if (dev_of_node(dev) && !pdata) { | |
725 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
726 | if (!pdata) { | |
727 | pr_err("cannot allocate platform data buffer\n"); | |
728 | err = -ENOMEM; | |
729 | goto fail_out; | |
730 | } | |
731 | ||
732 | err = ramoops_parse_dt(pdev, pdata); | |
733 | if (err < 0) | |
734 | goto fail_out; | |
735 | } | |
736 | ||
737 | /* Only a single ramoops area allowed at a time, so fail extra | |
738 | * probes. | |
739 | */ | |
740 | if (cxt->max_dump_cnt) | |
741 | goto fail_out; | |
742 | ||
743 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && | |
744 | !pdata->ftrace_size && !pdata->pmsg_size)) { | |
745 | pr_err("The memory size and the record/console size must be " | |
746 | "non-zero\n"); | |
747 | goto fail_out; | |
748 | } | |
749 | ||
750 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) | |
751 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); | |
752 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) | |
753 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); | |
754 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) | |
755 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); | |
756 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) | |
757 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
758 | ||
759 | cxt->size = pdata->mem_size; | |
760 | cxt->phys_addr = pdata->mem_address; | |
761 | cxt->memtype = pdata->mem_type; | |
762 | cxt->record_size = pdata->record_size; | |
763 | cxt->console_size = pdata->console_size; | |
764 | cxt->ftrace_size = pdata->ftrace_size; | |
765 | cxt->pmsg_size = pdata->pmsg_size; | |
766 | cxt->dump_oops = pdata->dump_oops; | |
767 | cxt->flags = pdata->flags; | |
768 | cxt->ecc_info = pdata->ecc_info; | |
769 | ||
770 | paddr = cxt->phys_addr; | |
771 | ||
772 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size | |
773 | - cxt->pmsg_size; | |
774 | err = ramoops_init_przs("dump", dev, cxt, &cxt->przs, &paddr, | |
775 | dump_mem_sz, cxt->record_size, | |
776 | &cxt->max_dump_cnt, 0, 0); | |
777 | if (err) | |
778 | goto fail_out; | |
779 | ||
780 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, | |
781 | cxt->console_size, 0); | |
782 | if (err) | |
783 | goto fail_init_cprz; | |
784 | ||
785 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
786 | ? nr_cpu_ids | |
787 | : 1; | |
788 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, | |
789 | cxt->ftrace_size, -1, | |
790 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
791 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
792 | ? PRZ_FLAG_NO_LOCK : 0); | |
793 | if (err) | |
794 | goto fail_init_fprz; | |
795 | ||
796 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, | |
797 | cxt->pmsg_size, 0); | |
798 | if (err) | |
799 | goto fail_init_mprz; | |
800 | ||
801 | cxt->pstore.data = cxt; | |
802 | /* | |
803 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we | |
804 | * have to handle dumps, we must have at least record_size buffer. And | |
805 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
806 | * ZERO_SIZE_PTR). | |
807 | */ | |
808 | if (cxt->console_size) | |
809 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
810 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
811 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); | |
812 | if (!cxt->pstore.buf) { | |
813 | pr_err("cannot allocate pstore buffer\n"); | |
814 | err = -ENOMEM; | |
815 | goto fail_clear; | |
816 | } | |
817 | spin_lock_init(&cxt->pstore.buf_lock); | |
818 | ||
819 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; | |
820 | if (cxt->console_size) | |
821 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
822 | if (cxt->ftrace_size) | |
823 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; | |
824 | if (cxt->pmsg_size) | |
825 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
826 | ||
827 | err = pstore_register(&cxt->pstore); | |
828 | if (err) { | |
829 | pr_err("registering with pstore failed\n"); | |
830 | goto fail_buf; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Update the module parameter variables as well so they are visible | |
835 | * through /sys/module/ramoops/parameters/ | |
836 | */ | |
837 | mem_size = pdata->mem_size; | |
838 | mem_address = pdata->mem_address; | |
839 | record_size = pdata->record_size; | |
840 | dump_oops = pdata->dump_oops; | |
841 | ramoops_console_size = pdata->console_size; | |
842 | ramoops_pmsg_size = pdata->pmsg_size; | |
843 | ramoops_ftrace_size = pdata->ftrace_size; | |
844 | ||
845 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", | |
846 | cxt->size, (unsigned long long)cxt->phys_addr, | |
847 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); | |
848 | ||
849 | return 0; | |
850 | ||
851 | fail_buf: | |
852 | kfree(cxt->pstore.buf); | |
853 | fail_clear: | |
854 | cxt->pstore.bufsize = 0; | |
855 | persistent_ram_free(cxt->mprz); | |
856 | fail_init_mprz: | |
857 | fail_init_fprz: | |
858 | persistent_ram_free(cxt->cprz); | |
859 | fail_init_cprz: | |
860 | ramoops_free_przs(cxt); | |
861 | fail_out: | |
862 | return err; | |
863 | } | |
864 | ||
865 | static int ramoops_remove(struct platform_device *pdev) | |
866 | { | |
867 | struct ramoops_context *cxt = &oops_cxt; | |
868 | ||
869 | pstore_unregister(&cxt->pstore); | |
870 | ||
871 | kfree(cxt->pstore.buf); | |
872 | cxt->pstore.bufsize = 0; | |
873 | ||
874 | persistent_ram_free(cxt->mprz); | |
875 | persistent_ram_free(cxt->cprz); | |
876 | ramoops_free_przs(cxt); | |
877 | ||
878 | return 0; | |
879 | } | |
880 | ||
881 | static const struct of_device_id dt_match[] = { | |
882 | { .compatible = "ramoops" }, | |
883 | {} | |
884 | }; | |
885 | ||
886 | static struct platform_driver ramoops_driver = { | |
887 | .probe = ramoops_probe, | |
888 | .remove = ramoops_remove, | |
889 | .driver = { | |
890 | .name = "ramoops", | |
891 | .of_match_table = dt_match, | |
892 | }, | |
893 | }; | |
894 | ||
895 | static void ramoops_register_dummy(void) | |
896 | { | |
897 | if (!mem_size) | |
898 | return; | |
899 | ||
900 | pr_info("using module parameters\n"); | |
901 | ||
902 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
903 | if (!dummy_data) { | |
904 | pr_info("could not allocate pdata\n"); | |
905 | return; | |
906 | } | |
907 | ||
908 | dummy_data->mem_size = mem_size; | |
909 | dummy_data->mem_address = mem_address; | |
910 | dummy_data->mem_type = mem_type; | |
911 | dummy_data->record_size = record_size; | |
912 | dummy_data->console_size = ramoops_console_size; | |
913 | dummy_data->ftrace_size = ramoops_ftrace_size; | |
914 | dummy_data->pmsg_size = ramoops_pmsg_size; | |
915 | dummy_data->dump_oops = dump_oops; | |
916 | dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU; | |
917 | ||
918 | /* | |
919 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
920 | * (using 1 byte for ECC isn't much of use anyway). | |
921 | */ | |
922 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; | |
923 | ||
924 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
925 | dummy_data, sizeof(struct ramoops_platform_data)); | |
926 | if (IS_ERR(dummy)) { | |
927 | pr_info("could not create platform device: %ld\n", | |
928 | PTR_ERR(dummy)); | |
929 | } | |
930 | } | |
931 | ||
932 | static int __init ramoops_init(void) | |
933 | { | |
934 | ramoops_register_dummy(); | |
935 | return platform_driver_register(&ramoops_driver); | |
936 | } | |
937 | postcore_initcall(ramoops_init); | |
938 | ||
939 | static void __exit ramoops_exit(void) | |
940 | { | |
941 | platform_driver_unregister(&ramoops_driver); | |
942 | platform_device_unregister(dummy); | |
943 | kfree(dummy_data); | |
944 | } | |
945 | module_exit(ramoops_exit); | |
946 | ||
947 | MODULE_LICENSE("GPL"); | |
948 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
949 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |