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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / fs / pstore / ram.c
blob27c059e1760a8918a0dde19cb884c5ff4563606c
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 **dprzs; /* Oops dump zones */
89 struct persistent_ram_zone *cprz; /* Console zone */
90 struct persistent_ram_zone **fprzs; /* Ftrace zones */
91 struct persistent_ram_zone *mprz; /* PMSG zone */
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->dprzs, &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(&timestamp)) {
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->dprzs)
434 return -ENOSPC;
435
436 prz = cxt->dprzs[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->dprzs[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->dprzs) {
517 for (i = 0; i < cxt->max_dump_cnt; i++)
518 persistent_ram_free(cxt->dprzs[i]);
519
520 kfree(cxt->dprzs);
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 /*
738 * Only a single ramoops area allowed at a time, so fail extra
739 * probes.
740 */
741 if (cxt->max_dump_cnt) {
742 pr_err("already initialized\n");
743 goto fail_out;
744 }
745
746 /* Make sure we didn't get bogus platform data pointer. */
747 if (!pdata) {
748 pr_err("NULL platform data\n");
749 goto fail_out;
750 }
751
752 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
753 !pdata->ftrace_size && !pdata->pmsg_size)) {
754 pr_err("The memory size and the record/console size must be "
755 "non-zero\n");
756 goto fail_out;
757 }
758
759 if (pdata->record_size && !is_power_of_2(pdata->record_size))
760 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
761 if (pdata->console_size && !is_power_of_2(pdata->console_size))
762 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
763 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
764 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
765 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
766 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
767
768 cxt->size = pdata->mem_size;
769 cxt->phys_addr = pdata->mem_address;
770 cxt->memtype = pdata->mem_type;
771 cxt->record_size = pdata->record_size;
772 cxt->console_size = pdata->console_size;
773 cxt->ftrace_size = pdata->ftrace_size;
774 cxt->pmsg_size = pdata->pmsg_size;
775 cxt->dump_oops = pdata->dump_oops;
776 cxt->flags = pdata->flags;
777 cxt->ecc_info = pdata->ecc_info;
778
779 paddr = cxt->phys_addr;
780
781 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
782 - cxt->pmsg_size;
783 err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
784 dump_mem_sz, cxt->record_size,
785 &cxt->max_dump_cnt, 0, 0);
786 if (err)
787 goto fail_out;
788
789 err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
790 cxt->console_size, 0);
791 if (err)
792 goto fail_init_cprz;
793
794 cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
795 ? nr_cpu_ids
796 : 1;
797 err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
798 cxt->ftrace_size, -1,
799 &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
800 (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
801 ? PRZ_FLAG_NO_LOCK : 0);
802 if (err)
803 goto fail_init_fprz;
804
805 err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
806 cxt->pmsg_size, 0);
807 if (err)
808 goto fail_init_mprz;
809
810 cxt->pstore.data = cxt;
811 /*
812 * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
813 * have to handle dumps, we must have at least record_size buffer. And
814 * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
815 * ZERO_SIZE_PTR).
816 */
817 if (cxt->console_size)
818 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
819 cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
820 cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
821 if (!cxt->pstore.buf) {
822 pr_err("cannot allocate pstore buffer\n");
823 err = -ENOMEM;
824 goto fail_clear;
825 }
826 spin_lock_init(&cxt->pstore.buf_lock);
827
828 cxt->pstore.flags = PSTORE_FLAGS_DMESG;
829 if (cxt->console_size)
830 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
831 if (cxt->ftrace_size)
832 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
833 if (cxt->pmsg_size)
834 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
835
836 err = pstore_register(&cxt->pstore);
837 if (err) {
838 pr_err("registering with pstore failed\n");
839 goto fail_buf;
840 }
841
842 /*
843 * Update the module parameter variables as well so they are visible
844 * through /sys/module/ramoops/parameters/
845 */
846 mem_size = pdata->mem_size;
847 mem_address = pdata->mem_address;
848 record_size = pdata->record_size;
849 dump_oops = pdata->dump_oops;
850 ramoops_console_size = pdata->console_size;
851 ramoops_pmsg_size = pdata->pmsg_size;
852 ramoops_ftrace_size = pdata->ftrace_size;
853
854 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
855 cxt->size, (unsigned long long)cxt->phys_addr,
856 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
857
858 return 0;
859
860 fail_buf:
861 kfree(cxt->pstore.buf);
862 fail_clear:
863 cxt->pstore.bufsize = 0;
864 persistent_ram_free(cxt->mprz);
865 fail_init_mprz:
866 fail_init_fprz:
867 persistent_ram_free(cxt->cprz);
868 fail_init_cprz:
869 ramoops_free_przs(cxt);
870 fail_out:
871 return err;
872 }
873
874 static int ramoops_remove(struct platform_device *pdev)
875 {
876 struct ramoops_context *cxt = &oops_cxt;
877
878 pstore_unregister(&cxt->pstore);
879
880 kfree(cxt->pstore.buf);
881 cxt->pstore.bufsize = 0;
882
883 persistent_ram_free(cxt->mprz);
884 persistent_ram_free(cxt->cprz);
885 ramoops_free_przs(cxt);
886
887 return 0;
888 }
889
890 static const struct of_device_id dt_match[] = {
891 { .compatible = "ramoops" },
892 {}
893 };
894
895 static struct platform_driver ramoops_driver = {
896 .probe = ramoops_probe,
897 .remove = ramoops_remove,
898 .driver = {
899 .name = "ramoops",
900 .of_match_table = dt_match,
901 },
902 };
903
904 static void ramoops_register_dummy(void)
905 {
906 if (!mem_size)
907 return;
908
909 pr_info("using module parameters\n");
910
911 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
912 if (!dummy_data) {
913 pr_info("could not allocate pdata\n");
914 return;
915 }
916
917 dummy_data->mem_size = mem_size;
918 dummy_data->mem_address = mem_address;
919 dummy_data->mem_type = mem_type;
920 dummy_data->record_size = record_size;
921 dummy_data->console_size = ramoops_console_size;
922 dummy_data->ftrace_size = ramoops_ftrace_size;
923 dummy_data->pmsg_size = ramoops_pmsg_size;
924 dummy_data->dump_oops = dump_oops;
925 dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
926
927 /*
928 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
929 * (using 1 byte for ECC isn't much of use anyway).
930 */
931 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
932
933 dummy = platform_device_register_data(NULL, "ramoops", -1,
934 dummy_data, sizeof(struct ramoops_platform_data));
935 if (IS_ERR(dummy)) {
936 pr_info("could not create platform device: %ld\n",
937 PTR_ERR(dummy));
938 }
939 }
940
941 static int __init ramoops_init(void)
942 {
943 ramoops_register_dummy();
944 return platform_driver_register(&ramoops_driver);
945 }
946 postcore_initcall(ramoops_init);
947
948 static void __exit ramoops_exit(void)
949 {
950 platform_driver_unregister(&ramoops_driver);
951 platform_device_unregister(dummy);
952 kfree(dummy_data);
953 }
954 module_exit(ramoops_exit);
955
956 MODULE_LICENSE("GPL");
957 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
958 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
Linux with added FPC-III support