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 *fprz;
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 struct persistent_ram_ecc_info ecc_info;
101 unsigned int max_dump_cnt;
102 unsigned int dump_write_cnt;
103 /* _read_cnt need clear on ramoops_pstore_open */
104 unsigned int dump_read_cnt;
105 unsigned int console_read_cnt;
106 unsigned int ftrace_read_cnt;
107 unsigned int pmsg_read_cnt;
108 struct pstore_info pstore;
109 };
110
111 static struct platform_device *dummy;
112 static struct ramoops_platform_data *dummy_data;
113
ramoops_pstore_open(struct pstore_info * psi)114 static int ramoops_pstore_open(struct pstore_info *psi)
115 {
116 struct ramoops_context *cxt = psi->data;
117
118 cxt->dump_read_cnt = 0;
119 cxt->console_read_cnt = 0;
120 cxt->ftrace_read_cnt = 0;
121 cxt->pmsg_read_cnt = 0;
122 return 0;
123 }
124
125 static struct persistent_ram_zone *
ramoops_get_next_prz(struct persistent_ram_zone * przs[],uint * c,uint max,u64 * id,enum pstore_type_id * typep,enum pstore_type_id type,bool update)126 ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
127 u64 *id,
128 enum pstore_type_id *typep, enum pstore_type_id type,
129 bool update)
130 {
131 struct persistent_ram_zone *prz;
132 int i = (*c)++;
133
134 if (i >= max)
135 return NULL;
136
137 prz = przs[i];
138 if (!prz)
139 return NULL;
140
141 /* Update old/shadowed buffer. */
142 if (update)
143 persistent_ram_save_old(prz);
144
145 if (!persistent_ram_old_size(prz))
146 return NULL;
147
148 *typep = type;
149 *id = i;
150
151 return prz;
152 }
153
ramoops_read_kmsg_hdr(char * buffer,struct timespec * time,bool * compressed)154 static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
155 bool *compressed)
156 {
157 char data_type;
158 int header_length = 0;
159
160 if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
161 &time->tv_nsec, &data_type, &header_length) == 3) {
162 if (data_type == 'C')
163 *compressed = true;
164 else
165 *compressed = false;
166 } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
167 &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
168 *compressed = false;
169 } else {
170 time->tv_sec = 0;
171 time->tv_nsec = 0;
172 *compressed = false;
173 }
174 return header_length;
175 }
176
prz_ok(struct persistent_ram_zone * prz)177 static bool prz_ok(struct persistent_ram_zone *prz)
178 {
179 return !!prz && !!(persistent_ram_old_size(prz) +
180 persistent_ram_ecc_string(prz, NULL, 0));
181 }
182
ramoops_pstore_read(u64 * id,enum pstore_type_id * type,int * count,struct timespec * time,char ** buf,bool * compressed,ssize_t * ecc_notice_size,struct pstore_info * psi)183 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
184 int *count, struct timespec *time,
185 char **buf, bool *compressed,
186 ssize_t *ecc_notice_size,
187 struct pstore_info *psi)
188 {
189 ssize_t size;
190 struct ramoops_context *cxt = psi->data;
191 struct persistent_ram_zone *prz = NULL;
192 int header_length = 0;
193
194 /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
195 * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
196 * valid time stamps, so it is initialized to zero.
197 */
198 time->tv_sec = 0;
199 time->tv_nsec = 0;
200 *compressed = false;
201
202 /* Find the next valid persistent_ram_zone for DMESG */
203 while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
204 prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
205 cxt->max_dump_cnt, id, type,
206 PSTORE_TYPE_DMESG, 1);
207 if (!prz_ok(prz))
208 continue;
209 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
210 time, compressed);
211 /* Clear and skip this DMESG record if it has no valid header */
212 if (!header_length) {
213 persistent_ram_free_old(prz);
214 persistent_ram_zap(prz);
215 prz = NULL;
216 }
217 }
218
219 if (!prz_ok(prz))
220 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
221 1, id, type, PSTORE_TYPE_CONSOLE, 0);
222 if (!prz_ok(prz))
223 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
224 1, id, type, PSTORE_TYPE_FTRACE, 0);
225 if (!prz_ok(prz))
226 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
227 1, id, type, PSTORE_TYPE_PMSG, 0);
228 if (!prz_ok(prz))
229 return 0;
230
231 size = persistent_ram_old_size(prz) - header_length;
232
233 /* ECC correction notice */
234 *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
235
236 *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
237 if (*buf == NULL)
238 return -ENOMEM;
239
240 memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
241 persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
242
243 return size;
244 }
245
ramoops_write_kmsg_hdr(struct persistent_ram_zone * prz,bool compressed)246 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
247 bool compressed)
248 {
249 char *hdr;
250 struct timespec timestamp;
251 size_t len;
252
253 /* Report zeroed timestamp if called before timekeeping has resumed. */
254 if (__getnstimeofday(×tamp)) {
255 timestamp.tv_sec = 0;
256 timestamp.tv_nsec = 0;
257 }
258 hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
259 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
260 compressed ? 'C' : 'D');
261 WARN_ON_ONCE(!hdr);
262 len = hdr ? strlen(hdr) : 0;
263 persistent_ram_write(prz, hdr, len);
264 kfree(hdr);
265
266 return len;
267 }
268
ramoops_pstore_write_buf(enum pstore_type_id type,enum kmsg_dump_reason reason,u64 * id,unsigned int part,const char * buf,bool compressed,size_t size,struct pstore_info * psi)269 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
270 enum kmsg_dump_reason reason,
271 u64 *id, unsigned int part,
272 const char *buf,
273 bool compressed, size_t size,
274 struct pstore_info *psi)
275 {
276 struct ramoops_context *cxt = psi->data;
277 struct persistent_ram_zone *prz;
278 size_t hlen;
279
280 if (type == PSTORE_TYPE_CONSOLE) {
281 if (!cxt->cprz)
282 return -ENOMEM;
283 persistent_ram_write(cxt->cprz, buf, size);
284 return 0;
285 } else if (type == PSTORE_TYPE_FTRACE) {
286 if (!cxt->fprz)
287 return -ENOMEM;
288 persistent_ram_write(cxt->fprz, buf, size);
289 return 0;
290 } else if (type == PSTORE_TYPE_PMSG) {
291 if (!cxt->mprz)
292 return -ENOMEM;
293 persistent_ram_write(cxt->mprz, buf, size);
294 return 0;
295 }
296
297 if (type != PSTORE_TYPE_DMESG)
298 return -EINVAL;
299
300 /* Out of the various dmesg dump types, ramoops is currently designed
301 * to only store crash logs, rather than storing general kernel logs.
302 */
303 if (reason != KMSG_DUMP_OOPS &&
304 reason != KMSG_DUMP_PANIC)
305 return -EINVAL;
306
307 /* Skip Oopes when configured to do so. */
308 if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
309 return -EINVAL;
310
311 /* Explicitly only take the first part of any new crash.
312 * If our buffer is larger than kmsg_bytes, this can never happen,
313 * and if our buffer is smaller than kmsg_bytes, we don't want the
314 * report split across multiple records.
315 */
316 if (part != 1)
317 return -ENOSPC;
318
319 if (!cxt->przs)
320 return -ENOSPC;
321
322 prz = cxt->przs[cxt->dump_write_cnt];
323
324 hlen = ramoops_write_kmsg_hdr(prz, compressed);
325 if (size + hlen > prz->buffer_size)
326 size = prz->buffer_size - hlen;
327 persistent_ram_write(prz, buf, size);
328
329 cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
330
331 return 0;
332 }
333
ramoops_pstore_write_buf_user(enum pstore_type_id type,enum kmsg_dump_reason reason,u64 * id,unsigned int part,const char __user * buf,bool compressed,size_t size,struct pstore_info * psi)334 static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
335 enum kmsg_dump_reason reason,
336 u64 *id, unsigned int part,
337 const char __user *buf,
338 bool compressed, size_t size,
339 struct pstore_info *psi)
340 {
341 if (type == PSTORE_TYPE_PMSG) {
342 struct ramoops_context *cxt = psi->data;
343
344 if (!cxt->mprz)
345 return -ENOMEM;
346 return persistent_ram_write_user(cxt->mprz, buf, size);
347 }
348
349 return -EINVAL;
350 }
351
ramoops_pstore_erase(enum pstore_type_id type,u64 id,int count,struct timespec time,struct pstore_info * psi)352 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
353 struct timespec time, struct pstore_info *psi)
354 {
355 struct ramoops_context *cxt = psi->data;
356 struct persistent_ram_zone *prz;
357
358 switch (type) {
359 case PSTORE_TYPE_DMESG:
360 if (id >= cxt->max_dump_cnt)
361 return -EINVAL;
362 prz = cxt->przs[id];
363 break;
364 case PSTORE_TYPE_CONSOLE:
365 prz = cxt->cprz;
366 break;
367 case PSTORE_TYPE_FTRACE:
368 prz = cxt->fprz;
369 break;
370 case PSTORE_TYPE_PMSG:
371 prz = cxt->mprz;
372 break;
373 default:
374 return -EINVAL;
375 }
376
377 persistent_ram_free_old(prz);
378 persistent_ram_zap(prz);
379
380 return 0;
381 }
382
383 static struct ramoops_context oops_cxt = {
384 .pstore = {
385 .owner = THIS_MODULE,
386 .name = "ramoops",
387 .open = ramoops_pstore_open,
388 .read = ramoops_pstore_read,
389 .write_buf = ramoops_pstore_write_buf,
390 .write_buf_user = ramoops_pstore_write_buf_user,
391 .erase = ramoops_pstore_erase,
392 },
393 };
394
ramoops_free_przs(struct ramoops_context * cxt)395 static void ramoops_free_przs(struct ramoops_context *cxt)
396 {
397 int i;
398
399 if (!cxt->przs)
400 return;
401
402 for (i = 0; i < cxt->max_dump_cnt; i++)
403 persistent_ram_free(cxt->przs[i]);
404
405 kfree(cxt->przs);
406 cxt->max_dump_cnt = 0;
407 }
408
ramoops_init_przs(struct device * dev,struct ramoops_context * cxt,phys_addr_t * paddr,size_t dump_mem_sz)409 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
410 phys_addr_t *paddr, size_t dump_mem_sz)
411 {
412 int err = -ENOMEM;
413 int i;
414
415 if (!cxt->record_size)
416 return 0;
417
418 if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
419 dev_err(dev, "no room for dumps\n");
420 return -ENOMEM;
421 }
422
423 cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
424 if (!cxt->max_dump_cnt)
425 return -ENOMEM;
426
427 cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
428 GFP_KERNEL);
429 if (!cxt->przs) {
430 dev_err(dev, "failed to initialize a prz array for dumps\n");
431 goto fail_mem;
432 }
433
434 for (i = 0; i < cxt->max_dump_cnt; i++) {
435 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
436 &cxt->ecc_info,
437 cxt->memtype, 0);
438 if (IS_ERR(cxt->przs[i])) {
439 err = PTR_ERR(cxt->przs[i]);
440 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
441 cxt->record_size, (unsigned long long)*paddr, err);
442
443 while (i > 0) {
444 i--;
445 persistent_ram_free(cxt->przs[i]);
446 }
447 goto fail_prz;
448 }
449 *paddr += cxt->record_size;
450 }
451
452 return 0;
453 fail_prz:
454 kfree(cxt->przs);
455 fail_mem:
456 cxt->max_dump_cnt = 0;
457 return err;
458 }
459
ramoops_init_prz(struct device * dev,struct ramoops_context * cxt,struct persistent_ram_zone ** prz,phys_addr_t * paddr,size_t sz,u32 sig)460 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
461 struct persistent_ram_zone **prz,
462 phys_addr_t *paddr, size_t sz, u32 sig)
463 {
464 if (!sz)
465 return 0;
466
467 if (*paddr + sz - cxt->phys_addr > cxt->size) {
468 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
469 sz, (unsigned long long)*paddr,
470 cxt->size, (unsigned long long)cxt->phys_addr);
471 return -ENOMEM;
472 }
473
474 *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
475 cxt->memtype, 0);
476 if (IS_ERR(*prz)) {
477 int err = PTR_ERR(*prz);
478
479 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
480 sz, (unsigned long long)*paddr, err);
481 return err;
482 }
483
484 persistent_ram_zap(*prz);
485
486 *paddr += sz;
487
488 return 0;
489 }
490
ramoops_parse_dt_size(struct platform_device * pdev,const char * propname,u32 * value)491 static int ramoops_parse_dt_size(struct platform_device *pdev,
492 const char *propname, u32 *value)
493 {
494 u32 val32 = 0;
495 int ret;
496
497 ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
498 if (ret < 0 && ret != -EINVAL) {
499 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
500 propname, ret);
501 return ret;
502 }
503
504 if (val32 > INT_MAX) {
505 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
506 return -EOVERFLOW;
507 }
508
509 *value = val32;
510 return 0;
511 }
512
ramoops_parse_dt(struct platform_device * pdev,struct ramoops_platform_data * pdata)513 static int ramoops_parse_dt(struct platform_device *pdev,
514 struct ramoops_platform_data *pdata)
515 {
516 struct device_node *of_node = pdev->dev.of_node;
517 struct resource *res;
518 u32 value;
519 int ret;
520
521 dev_dbg(&pdev->dev, "using Device Tree\n");
522
523 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
524 if (!res) {
525 dev_err(&pdev->dev,
526 "failed to locate DT /reserved-memory resource\n");
527 return -EINVAL;
528 }
529
530 pdata->mem_size = resource_size(res);
531 pdata->mem_address = res->start;
532 pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
533 pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
534
535 #define parse_size(name, field) { \
536 ret = ramoops_parse_dt_size(pdev, name, &value); \
537 if (ret < 0) \
538 return ret; \
539 field = value; \
540 }
541
542 parse_size("record-size", pdata->record_size);
543 parse_size("console-size", pdata->console_size);
544 parse_size("ftrace-size", pdata->ftrace_size);
545 parse_size("pmsg-size", pdata->pmsg_size);
546 parse_size("ecc-size", pdata->ecc_info.ecc_size);
547
548 #undef parse_size
549
550 return 0;
551 }
552
ramoops_console_write_buf(const char * buf,size_t size)553 void notrace ramoops_console_write_buf(const char *buf, size_t size)
554 {
555 struct ramoops_context *cxt = &oops_cxt;
556 persistent_ram_write(cxt->cprz, buf, size);
557 }
558
ramoops_probe(struct platform_device * pdev)559 static int ramoops_probe(struct platform_device *pdev)
560 {
561 struct device *dev = &pdev->dev;
562 struct ramoops_platform_data *pdata = dev->platform_data;
563 struct ramoops_context *cxt = &oops_cxt;
564 size_t dump_mem_sz;
565 phys_addr_t paddr;
566 int err = -EINVAL;
567
568 if (dev_of_node(dev) && !pdata) {
569 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
570 if (!pdata) {
571 err = -ENOMEM;
572 goto fail_out;
573 }
574
575 err = ramoops_parse_dt(pdev, pdata);
576 if (err < 0)
577 goto fail_out;
578 }
579
580 /* Only a single ramoops area allowed at a time, so fail extra
581 * probes.
582 */
583 if (cxt->max_dump_cnt)
584 goto fail_out;
585
586 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
587 !pdata->ftrace_size && !pdata->pmsg_size)) {
588 pr_err("The memory size and the record/console size must be "
589 "non-zero\n");
590 goto fail_out;
591 }
592
593 if (pdata->record_size && !is_power_of_2(pdata->record_size))
594 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
595 if (pdata->console_size && !is_power_of_2(pdata->console_size))
596 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
597 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
598 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
599 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
600 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
601
602 cxt->size = pdata->mem_size;
603 cxt->phys_addr = pdata->mem_address;
604 cxt->memtype = pdata->mem_type;
605 cxt->record_size = pdata->record_size;
606 cxt->console_size = pdata->console_size;
607 cxt->ftrace_size = pdata->ftrace_size;
608 cxt->pmsg_size = pdata->pmsg_size;
609 cxt->dump_oops = pdata->dump_oops;
610 cxt->ecc_info = pdata->ecc_info;
611
612 paddr = cxt->phys_addr;
613
614 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
615 - cxt->pmsg_size;
616 err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
617 if (err)
618 goto fail_out;
619
620 err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
621 cxt->console_size, 0);
622 if (err)
623 goto fail_init_cprz;
624
625 err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
626 LINUX_VERSION_CODE);
627 if (err)
628 goto fail_init_fprz;
629
630 err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
631 if (err)
632 goto fail_init_mprz;
633
634 cxt->pstore.data = cxt;
635 /*
636 * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
637 * have to handle dumps, we must have at least record_size buffer. And
638 * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
639 * ZERO_SIZE_PTR).
640 */
641 if (cxt->console_size)
642 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
643 cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
644 cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
645 if (!cxt->pstore.buf) {
646 pr_err("cannot allocate pstore buffer\n");
647 err = -ENOMEM;
648 goto fail_clear;
649 }
650 spin_lock_init(&cxt->pstore.buf_lock);
651
652 cxt->pstore.flags = PSTORE_FLAGS_DMESG;
653 if (cxt->console_size)
654 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
655 if (cxt->ftrace_size)
656 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
657 if (cxt->pmsg_size)
658 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
659
660 err = pstore_register(&cxt->pstore);
661 if (err) {
662 pr_err("registering with pstore failed\n");
663 goto fail_buf;
664 }
665
666 /*
667 * Update the module parameter variables as well so they are visible
668 * through /sys/module/ramoops/parameters/
669 */
670 mem_size = pdata->mem_size;
671 mem_address = pdata->mem_address;
672 record_size = pdata->record_size;
673 dump_oops = pdata->dump_oops;
674 ramoops_console_size = pdata->console_size;
675 ramoops_pmsg_size = pdata->pmsg_size;
676 ramoops_ftrace_size = pdata->ftrace_size;
677
678 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
679 cxt->size, (unsigned long long)cxt->phys_addr,
680 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
681
682 return 0;
683
684 fail_buf:
685 kfree(cxt->pstore.buf);
686 fail_clear:
687 cxt->pstore.bufsize = 0;
688 persistent_ram_free(cxt->mprz);
689 fail_init_mprz:
690 persistent_ram_free(cxt->fprz);
691 fail_init_fprz:
692 persistent_ram_free(cxt->cprz);
693 fail_init_cprz:
694 ramoops_free_przs(cxt);
695 fail_out:
696 return err;
697 }
698
ramoops_remove(struct platform_device * pdev)699 static int ramoops_remove(struct platform_device *pdev)
700 {
701 struct ramoops_context *cxt = &oops_cxt;
702
703 pstore_unregister(&cxt->pstore);
704
705 kfree(cxt->pstore.buf);
706 cxt->pstore.bufsize = 0;
707
708 persistent_ram_free(cxt->mprz);
709 persistent_ram_free(cxt->fprz);
710 persistent_ram_free(cxt->cprz);
711 ramoops_free_przs(cxt);
712
713 return 0;
714 }
715
716 static const struct of_device_id dt_match[] = {
717 { .compatible = "ramoops" },
718 {}
719 };
720
721 static struct platform_driver ramoops_driver = {
722 .probe = ramoops_probe,
723 .remove = ramoops_remove,
724 .driver = {
725 .name = "ramoops",
726 .of_match_table = dt_match,
727 },
728 };
729
ramoops_register_dummy(void)730 static void ramoops_register_dummy(void)
731 {
732 if (!mem_size)
733 return;
734
735 pr_info("using module parameters\n");
736
737 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
738 if (!dummy_data) {
739 pr_info("could not allocate pdata\n");
740 return;
741 }
742
743 dummy_data->mem_size = mem_size;
744 dummy_data->mem_address = mem_address;
745 dummy_data->mem_type = mem_type;
746 dummy_data->record_size = record_size;
747 dummy_data->console_size = ramoops_console_size;
748 dummy_data->ftrace_size = ramoops_ftrace_size;
749 dummy_data->pmsg_size = ramoops_pmsg_size;
750 dummy_data->dump_oops = dump_oops;
751 /*
752 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
753 * (using 1 byte for ECC isn't much of use anyway).
754 */
755 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
756
757 dummy = platform_device_register_data(NULL, "ramoops", -1,
758 dummy_data, sizeof(struct ramoops_platform_data));
759 if (IS_ERR(dummy)) {
760 pr_info("could not create platform device: %ld\n",
761 PTR_ERR(dummy));
762 }
763 }
764
ramoops_init(void)765 static int __init ramoops_init(void)
766 {
767 ramoops_register_dummy();
768 return platform_driver_register(&ramoops_driver);
769 }
770 postcore_initcall(ramoops_init);
771
ramoops_exit(void)772 static void __exit ramoops_exit(void)
773 {
774 platform_driver_unregister(&ramoops_driver);
775 platform_device_unregister(dummy);
776 kfree(dummy_data);
777 }
778 module_exit(ramoops_exit);
779
780 MODULE_LICENSE("GPL");
781 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
782 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
783