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TOMOYO Linux Cross Reference
Linux/fs/pstore/ram.c

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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 **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         /* Give up if we never existed or have hit the end. */
137         if (!przs || i >= max)
138                 return NULL;
139 
140         prz = przs[i];
141         if (!prz)
142                 return NULL;
143 
144         /* Update old/shadowed buffer. */
145         if (update)
146                 persistent_ram_save_old(prz);
147 
148         if (!persistent_ram_old_size(prz))
149                 return NULL;
150 
151         *typep = type;
152         *id = i;
153 
154         return prz;
155 }
156 
157 static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
158                                   bool *compressed)
159 {
160         char data_type;
161         int header_length = 0;
162 
163         if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
164                         &time->tv_nsec, &data_type, &header_length) == 3) {
165                 if (data_type == 'C')
166                         *compressed = true;
167                 else
168                         *compressed = false;
169         } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
170                         &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
171                         *compressed = false;
172         } else {
173                 time->tv_sec = 0;
174                 time->tv_nsec = 0;
175                 *compressed = false;
176         }
177         return header_length;
178 }
179 
180 static bool prz_ok(struct persistent_ram_zone *prz)
181 {
182         return !!prz && !!(persistent_ram_old_size(prz) +
183                            persistent_ram_ecc_string(prz, NULL, 0));
184 }
185 
186 static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
187                                   struct persistent_ram_zone *src)
188 {
189         size_t dest_size, src_size, total, dest_off, src_off;
190         size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
191         void *merged_buf;
192         struct pstore_ftrace_record *drec, *srec, *mrec;
193         size_t record_size = sizeof(struct pstore_ftrace_record);
194 
195         dest_off = dest->old_log_size % record_size;
196         dest_size = dest->old_log_size - dest_off;
197 
198         src_off = src->old_log_size % record_size;
199         src_size = src->old_log_size - src_off;
200 
201         total = dest_size + src_size;
202         merged_buf = kmalloc(total, GFP_KERNEL);
203         if (!merged_buf)
204                 return -ENOMEM;
205 
206         drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off);
207         srec = (struct pstore_ftrace_record *)(src->old_log + src_off);
208         mrec = (struct pstore_ftrace_record *)(merged_buf);
209 
210         while (dest_size > 0 && src_size > 0) {
211                 if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
212                     pstore_ftrace_read_timestamp(&srec[src_idx])) {
213                         mrec[merged_idx++] = drec[dest_idx++];
214                         dest_size -= record_size;
215                 } else {
216                         mrec[merged_idx++] = srec[src_idx++];
217                         src_size -= record_size;
218                 }
219         }
220 
221         while (dest_size > 0) {
222                 mrec[merged_idx++] = drec[dest_idx++];
223                 dest_size -= record_size;
224         }
225 
226         while (src_size > 0) {
227                 mrec[merged_idx++] = srec[src_idx++];
228                 src_size -= record_size;
229         }
230 
231         kfree(dest->old_log);
232         dest->old_log = merged_buf;
233         dest->old_log_size = total;
234 
235         return 0;
236 }
237 
238 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
239                                    int *count, struct timespec *time,
240                                    char **buf, bool *compressed,
241                                    ssize_t *ecc_notice_size,
242                                    struct pstore_info *psi)
243 {
244         ssize_t size = 0;
245         struct ramoops_context *cxt = psi->data;
246         struct persistent_ram_zone *prz = NULL;
247         int header_length = 0;
248         bool free_prz = false;
249 
250         /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
251          * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
252          * valid time stamps, so it is initialized to zero.
253          */
254         time->tv_sec = 0;
255         time->tv_nsec = 0;
256         *compressed = false;
257 
258         /* Find the next valid persistent_ram_zone for DMESG */
259         while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
260                 prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
261                                            cxt->max_dump_cnt, id, type,
262                                            PSTORE_TYPE_DMESG, 1);
263                 if (!prz_ok(prz))
264                         continue;
265                 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
266                                                       time, compressed);
267                 /* Clear and skip this DMESG record if it has no valid header */
268                 if (!header_length) {
269                         persistent_ram_free_old(prz);
270                         persistent_ram_zap(prz);
271                         prz = NULL;
272                 }
273         }
274 
275         if (!prz_ok(prz))
276                 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
277                                            1, id, type, PSTORE_TYPE_CONSOLE, 0);
278 
279         if (!prz_ok(prz))
280                 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
281                                            1, id, type, PSTORE_TYPE_PMSG, 0);
282 
283         /* ftrace is last since it may want to dynamically allocate memory. */
284         if (!prz_ok(prz)) {
285                 if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
286                         prz = ramoops_get_next_prz(cxt->fprzs,
287                                         &cxt->ftrace_read_cnt, 1, id, type,
288                                         PSTORE_TYPE_FTRACE, 0);
289                 } else {
290                         /*
291                          * Build a new dummy record which combines all the
292                          * per-cpu records including metadata and ecc info.
293                          */
294                         struct persistent_ram_zone *tmp_prz, *prz_next;
295 
296                         tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
297                                           GFP_KERNEL);
298                         if (!tmp_prz)
299                                 return -ENOMEM;
300                         free_prz = true;
301 
302                         while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
303                                 prz_next = ramoops_get_next_prz(cxt->fprzs,
304                                                 &cxt->ftrace_read_cnt,
305                                                 cxt->max_ftrace_cnt, id,
306                                                 type, PSTORE_TYPE_FTRACE, 0);
307 
308                                 if (!prz_ok(prz_next))
309                                         continue;
310 
311                                 tmp_prz->ecc_info = prz_next->ecc_info;
312                                 tmp_prz->corrected_bytes +=
313                                                 prz_next->corrected_bytes;
314                                 tmp_prz->bad_blocks += prz_next->bad_blocks;
315                                 size = ftrace_log_combine(tmp_prz, prz_next);
316                                 if (size)
317                                         goto out;
318                         }
319                         *id = 0;
320                         prz = tmp_prz;
321                 }
322         }
323 
324         if (!prz_ok(prz)) {
325                 size = 0;
326                 goto out;
327         }
328 
329         size = persistent_ram_old_size(prz) - header_length;
330 
331         /* ECC correction notice */
332         *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
333 
334         *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
335         if (*buf == NULL) {
336                 size = -ENOMEM;
337                 goto out;
338         }
339 
340         memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
341 
342         persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
343 
344 out:
345         if (free_prz) {
346                 kfree(prz->old_log);
347                 kfree(prz);
348         }
349 
350         return size;
351 }
352 
353 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
354                                      bool compressed)
355 {
356         char *hdr;
357         struct timespec timestamp;
358         size_t len;
359 
360         /* Report zeroed timestamp if called before timekeeping has resumed. */
361         if (__getnstimeofday(&timestamp)) {
362                 timestamp.tv_sec = 0;
363                 timestamp.tv_nsec = 0;
364         }
365         hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
366                 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
367                 compressed ? 'C' : 'D');
368         WARN_ON_ONCE(!hdr);
369         len = hdr ? strlen(hdr) : 0;
370         persistent_ram_write(prz, hdr, len);
371         kfree(hdr);
372 
373         return len;
374 }
375 
376 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
377                                             enum kmsg_dump_reason reason,
378                                             u64 *id, unsigned int part,
379                                             const char *buf,
380                                             bool compressed, size_t size,
381                                             struct pstore_info *psi)
382 {
383         struct ramoops_context *cxt = psi->data;
384         struct persistent_ram_zone *prz;
385         size_t hlen;
386 
387         if (type == PSTORE_TYPE_CONSOLE) {
388                 if (!cxt->cprz)
389                         return -ENOMEM;
390                 persistent_ram_write(cxt->cprz, buf, size);
391                 return 0;
392         } else if (type == PSTORE_TYPE_FTRACE) {
393                 int zonenum;
394 
395                 if (!cxt->fprzs)
396                         return -ENOMEM;
397                 /*
398                  * Choose zone by if we're using per-cpu buffers.
399                  */
400                 if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
401                         zonenum = smp_processor_id();
402                 else
403                         zonenum = 0;
404 
405                 persistent_ram_write(cxt->fprzs[zonenum], buf, size);
406                 return 0;
407         } else if (type == PSTORE_TYPE_PMSG) {
408                 pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
409                 return -EINVAL;
410         }
411 
412         if (type != PSTORE_TYPE_DMESG)
413                 return -EINVAL;
414 
415         /* Out of the various dmesg dump types, ramoops is currently designed
416          * to only store crash logs, rather than storing general kernel logs.
417          */
418         if (reason != KMSG_DUMP_OOPS &&
419             reason != KMSG_DUMP_PANIC)
420                 return -EINVAL;
421 
422         /* Skip Oopes when configured to do so. */
423         if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
424                 return -EINVAL;
425 
426         /* Explicitly only take the first part of any new crash.
427          * If our buffer is larger than kmsg_bytes, this can never happen,
428          * and if our buffer is smaller than kmsg_bytes, we don't want the
429          * report split across multiple records.
430          */
431         if (part != 1)
432                 return -ENOSPC;
433 
434         if (!cxt->dprzs)
435                 return -ENOSPC;
436 
437         prz = cxt->dprzs[cxt->dump_write_cnt];
438 
439         hlen = ramoops_write_kmsg_hdr(prz, compressed);
440         if (size + hlen > prz->buffer_size)
441                 size = prz->buffer_size - hlen;
442         persistent_ram_write(prz, buf, size);
443 
444         cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
445 
446         return 0;
447 }
448 
449 static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
450                                                  enum kmsg_dump_reason reason,
451                                                  u64 *id, unsigned int part,
452                                                  const char __user *buf,
453                                                  bool compressed, size_t size,
454                                                  struct pstore_info *psi)
455 {
456         if (type == PSTORE_TYPE_PMSG) {
457                 struct ramoops_context *cxt = psi->data;
458 
459                 if (!cxt->mprz)
460                         return -ENOMEM;
461                 return persistent_ram_write_user(cxt->mprz, buf, size);
462         }
463 
464         return -EINVAL;
465 }
466 
467 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
468                                 struct timespec time, struct pstore_info *psi)
469 {
470         struct ramoops_context *cxt = psi->data;
471         struct persistent_ram_zone *prz;
472 
473         switch (type) {
474         case PSTORE_TYPE_DMESG:
475                 if (id >= cxt->max_dump_cnt)
476                         return -EINVAL;
477                 prz = cxt->dprzs[id];
478                 break;
479         case PSTORE_TYPE_CONSOLE:
480                 prz = cxt->cprz;
481                 break;
482         case PSTORE_TYPE_FTRACE:
483                 if (id >= cxt->max_ftrace_cnt)
484                         return -EINVAL;
485                 prz = cxt->fprzs[id];
486                 break;
487         case PSTORE_TYPE_PMSG:
488                 prz = cxt->mprz;
489                 break;
490         default:
491                 return -EINVAL;
492         }
493 
494         persistent_ram_free_old(prz);
495         persistent_ram_zap(prz);
496 
497         return 0;
498 }
499 
500 static struct ramoops_context oops_cxt = {
501         .pstore = {
502                 .owner  = THIS_MODULE,
503                 .name   = "ramoops",
504                 .open   = ramoops_pstore_open,
505                 .read   = ramoops_pstore_read,
506                 .write_buf      = ramoops_pstore_write_buf,
507                 .write_buf_user = ramoops_pstore_write_buf_user,
508                 .erase  = ramoops_pstore_erase,
509         },
510 };
511 
512 static void ramoops_free_przs(struct ramoops_context *cxt)
513 {
514         int i;
515 
516         /* Free dump PRZs */
517         if (cxt->dprzs) {
518                 for (i = 0; i < cxt->max_dump_cnt; i++)
519                         persistent_ram_free(cxt->dprzs[i]);
520 
521                 kfree(cxt->dprzs);
522                 cxt->max_dump_cnt = 0;
523         }
524 
525         /* Free ftrace PRZs */
526         if (cxt->fprzs) {
527                 for (i = 0; i < cxt->max_ftrace_cnt; i++)
528                         persistent_ram_free(cxt->fprzs[i]);
529                 kfree(cxt->fprzs);
530                 cxt->max_ftrace_cnt = 0;
531         }
532 }
533 
534 static int ramoops_init_przs(const char *name,
535                              struct device *dev, struct ramoops_context *cxt,
536                              struct persistent_ram_zone ***przs,
537                              phys_addr_t *paddr, size_t mem_sz,
538                              ssize_t record_size,
539                              unsigned int *cnt, u32 sig, u32 flags)
540 {
541         int err = -ENOMEM;
542         int i;
543         size_t zone_sz;
544         struct persistent_ram_zone **prz_ar;
545 
546         /* Allocate nothing for 0 mem_sz or 0 record_size. */
547         if (mem_sz == 0 || record_size == 0) {
548                 *cnt = 0;
549                 return 0;
550         }
551 
552         /*
553          * If we have a negative record size, calculate it based on
554          * mem_sz / *cnt. If we have a positive record size, calculate
555          * cnt from mem_sz / record_size.
556          */
557         if (record_size < 0) {
558                 if (*cnt == 0)
559                         return 0;
560                 record_size = mem_sz / *cnt;
561                 if (record_size == 0) {
562                         dev_err(dev, "%s record size == 0 (%zu / %u)\n",
563                                 name, mem_sz, *cnt);
564                         goto fail;
565                 }
566         } else {
567                 *cnt = mem_sz / record_size;
568                 if (*cnt == 0) {
569                         dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
570                                 name, mem_sz, record_size);
571                         goto fail;
572                 }
573         }
574 
575         if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
576                 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
577                         name,
578                         mem_sz, (unsigned long long)*paddr,
579                         cxt->size, (unsigned long long)cxt->phys_addr);
580                 goto fail;
581         }
582 
583         zone_sz = mem_sz / *cnt;
584         if (!zone_sz) {
585                 dev_err(dev, "%s zone size == 0\n", name);
586                 goto fail;
587         }
588 
589         prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
590         if (!prz_ar)
591                 goto fail;
592 
593         for (i = 0; i < *cnt; i++) {
594                 prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
595                                                   &cxt->ecc_info,
596                                                   cxt->memtype, flags);
597                 if (IS_ERR(prz_ar[i])) {
598                         err = PTR_ERR(prz_ar[i]);
599                         dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
600                                 name, record_size,
601                                 (unsigned long long)*paddr, err);
602 
603                         while (i > 0) {
604                                 i--;
605                                 persistent_ram_free(prz_ar[i]);
606                         }
607                         kfree(prz_ar);
608                         goto fail;
609                 }
610                 *paddr += zone_sz;
611         }
612 
613         *przs = prz_ar;
614         return 0;
615 
616 fail:
617         *cnt = 0;
618         return err;
619 }
620 
621 static int ramoops_init_prz(const char *name,
622                             struct device *dev, struct ramoops_context *cxt,
623                             struct persistent_ram_zone **prz,
624                             phys_addr_t *paddr, size_t sz, u32 sig)
625 {
626         if (!sz)
627                 return 0;
628 
629         if (*paddr + sz - cxt->phys_addr > cxt->size) {
630                 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
631                         name, sz, (unsigned long long)*paddr,
632                         cxt->size, (unsigned long long)cxt->phys_addr);
633                 return -ENOMEM;
634         }
635 
636         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
637                                   cxt->memtype, 0);
638         if (IS_ERR(*prz)) {
639                 int err = PTR_ERR(*prz);
640 
641                 dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
642                         name, sz, (unsigned long long)*paddr, err);
643                 return err;
644         }
645 
646         persistent_ram_zap(*prz);
647 
648         *paddr += sz;
649 
650         return 0;
651 }
652 
653 static int ramoops_parse_dt_size(struct platform_device *pdev,
654                                  const char *propname, u32 *value)
655 {
656         u32 val32 = 0;
657         int ret;
658 
659         ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
660         if (ret < 0 && ret != -EINVAL) {
661                 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
662                         propname, ret);
663                 return ret;
664         }
665 
666         if (val32 > INT_MAX) {
667                 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
668                 return -EOVERFLOW;
669         }
670 
671         *value = val32;
672         return 0;
673 }
674 
675 static int ramoops_parse_dt(struct platform_device *pdev,
676                             struct ramoops_platform_data *pdata)
677 {
678         struct device_node *of_node = pdev->dev.of_node;
679         struct resource *res;
680         u32 value;
681         int ret;
682 
683         dev_dbg(&pdev->dev, "using Device Tree\n");
684 
685         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
686         if (!res) {
687                 dev_err(&pdev->dev,
688                         "failed to locate DT /reserved-memory resource\n");
689                 return -EINVAL;
690         }
691 
692         pdata->mem_size = resource_size(res);
693         pdata->mem_address = res->start;
694         pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
695         pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
696 
697 #define parse_size(name, field) {                                       \
698                 ret = ramoops_parse_dt_size(pdev, name, &value);        \
699                 if (ret < 0)                                            \
700                         return ret;                                     \
701                 field = value;                                          \
702         }
703 
704         parse_size("record-size", pdata->record_size);
705         parse_size("console-size", pdata->console_size);
706         parse_size("ftrace-size", pdata->ftrace_size);
707         parse_size("pmsg-size", pdata->pmsg_size);
708         parse_size("ecc-size", pdata->ecc_info.ecc_size);
709         parse_size("flags", pdata->flags);
710 
711 #undef parse_size
712 
713         return 0;
714 }
715 
716 static int ramoops_probe(struct platform_device *pdev)
717 {
718         struct device *dev = &pdev->dev;
719         struct ramoops_platform_data *pdata = dev->platform_data;
720         struct ramoops_context *cxt = &oops_cxt;
721         size_t dump_mem_sz;
722         phys_addr_t paddr;
723         int err = -EINVAL;
724 
725         if (dev_of_node(dev) && !pdata) {
726                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
727                 if (!pdata) {
728                         pr_err("cannot allocate platform data buffer\n");
729                         err = -ENOMEM;
730                         goto fail_out;
731                 }
732 
733                 err = ramoops_parse_dt(pdev, pdata);
734                 if (err < 0)
735                         goto fail_out;
736         }
737 
738         /*
739          * Only a single ramoops area allowed at a time, so fail extra
740          * probes.
741          */
742         if (cxt->max_dump_cnt) {
743                 pr_err("already initialized\n");
744                 goto fail_out;
745         }
746 
747         /* Make sure we didn't get bogus platform data pointer. */
748         if (!pdata) {
749                 pr_err("NULL platform data\n");
750                 goto fail_out;
751         }
752 
753         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
754                         !pdata->ftrace_size && !pdata->pmsg_size)) {
755                 pr_err("The memory size and the record/console size must be "
756                         "non-zero\n");
757                 goto fail_out;
758         }
759 
760         if (pdata->record_size && !is_power_of_2(pdata->record_size))
761                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
762         if (pdata->console_size && !is_power_of_2(pdata->console_size))
763                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
764         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
765                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
766         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
767                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
768 
769         cxt->size = pdata->mem_size;
770         cxt->phys_addr = pdata->mem_address;
771         cxt->memtype = pdata->mem_type;
772         cxt->record_size = pdata->record_size;
773         cxt->console_size = pdata->console_size;
774         cxt->ftrace_size = pdata->ftrace_size;
775         cxt->pmsg_size = pdata->pmsg_size;
776         cxt->dump_oops = pdata->dump_oops;
777         cxt->flags = pdata->flags;
778         cxt->ecc_info = pdata->ecc_info;
779 
780         paddr = cxt->phys_addr;
781 
782         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
783                         - cxt->pmsg_size;
784         err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
785                                 dump_mem_sz, cxt->record_size,
786                                 &cxt->max_dump_cnt, 0, 0);
787         if (err)
788                 goto fail_out;
789 
790         err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
791                                cxt->console_size, 0);
792         if (err)
793                 goto fail_init_cprz;
794 
795         cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
796                                 ? nr_cpu_ids
797                                 : 1;
798         err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
799                                 cxt->ftrace_size, -1,
800                                 &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
801                                 (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
802                                         ? PRZ_FLAG_NO_LOCK : 0);
803         if (err)
804                 goto fail_init_fprz;
805 
806         err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
807                                 cxt->pmsg_size, 0);
808         if (err)
809                 goto fail_init_mprz;
810 
811         cxt->pstore.data = cxt;
812         /*
813          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
814          * have to handle dumps, we must have at least record_size buffer. And
815          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
816          * ZERO_SIZE_PTR).
817          */
818         if (cxt->console_size)
819                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
820         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
821         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
822         if (!cxt->pstore.buf) {
823                 pr_err("cannot allocate pstore buffer\n");
824                 err = -ENOMEM;
825                 goto fail_clear;
826         }
827         spin_lock_init(&cxt->pstore.buf_lock);
828 
829         cxt->pstore.flags = PSTORE_FLAGS_DMESG;
830         if (cxt->console_size)
831                 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
832         if (cxt->ftrace_size)
833                 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
834         if (cxt->pmsg_size)
835                 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
836 
837         err = pstore_register(&cxt->pstore);
838         if (err) {
839                 pr_err("registering with pstore failed\n");
840                 goto fail_buf;
841         }
842 
843         /*
844          * Update the module parameter variables as well so they are visible
845          * through /sys/module/ramoops/parameters/
846          */
847         mem_size = pdata->mem_size;
848         mem_address = pdata->mem_address;
849         record_size = pdata->record_size;
850         dump_oops = pdata->dump_oops;
851         ramoops_console_size = pdata->console_size;
852         ramoops_pmsg_size = pdata->pmsg_size;
853         ramoops_ftrace_size = pdata->ftrace_size;
854 
855         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
856                 cxt->size, (unsigned long long)cxt->phys_addr,
857                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
858 
859         return 0;
860 
861 fail_buf:
862         kfree(cxt->pstore.buf);
863 fail_clear:
864         cxt->pstore.bufsize = 0;
865         persistent_ram_free(cxt->mprz);
866 fail_init_mprz:
867 fail_init_fprz:
868         persistent_ram_free(cxt->cprz);
869 fail_init_cprz:
870         ramoops_free_przs(cxt);
871 fail_out:
872         return err;
873 }
874 
875 static int ramoops_remove(struct platform_device *pdev)
876 {
877         struct ramoops_context *cxt = &oops_cxt;
878 
879         pstore_unregister(&cxt->pstore);
880 
881         kfree(cxt->pstore.buf);
882         cxt->pstore.bufsize = 0;
883 
884         persistent_ram_free(cxt->mprz);
885         persistent_ram_free(cxt->cprz);
886         ramoops_free_przs(cxt);
887 
888         return 0;
889 }
890 
891 static const struct of_device_id dt_match[] = {
892         { .compatible = "ramoops" },
893         {}
894 };
895 
896 static struct platform_driver ramoops_driver = {
897         .probe          = ramoops_probe,
898         .remove         = ramoops_remove,
899         .driver         = {
900                 .name           = "ramoops",
901                 .of_match_table = dt_match,
902         },
903 };
904 
905 static void ramoops_register_dummy(void)
906 {
907         if (!mem_size)
908                 return;
909 
910         pr_info("using module parameters\n");
911 
912         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
913         if (!dummy_data) {
914                 pr_info("could not allocate pdata\n");
915                 return;
916         }
917 
918         dummy_data->mem_size = mem_size;
919         dummy_data->mem_address = mem_address;
920         dummy_data->mem_type = mem_type;
921         dummy_data->record_size = record_size;
922         dummy_data->console_size = ramoops_console_size;
923         dummy_data->ftrace_size = ramoops_ftrace_size;
924         dummy_data->pmsg_size = ramoops_pmsg_size;
925         dummy_data->dump_oops = dump_oops;
926         dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
927 
928         /*
929          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
930          * (using 1 byte for ECC isn't much of use anyway).
931          */
932         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
933 
934         dummy = platform_device_register_data(NULL, "ramoops", -1,
935                         dummy_data, sizeof(struct ramoops_platform_data));
936         if (IS_ERR(dummy)) {
937                 pr_info("could not create platform device: %ld\n",
938                         PTR_ERR(dummy));
939         }
940 }
941 
942 static int __init ramoops_init(void)
943 {
944         ramoops_register_dummy();
945         return platform_driver_register(&ramoops_driver);
946 }
947 postcore_initcall(ramoops_init);
948 
949 static void __exit ramoops_exit(void)
950 {
951         platform_driver_unregister(&ramoops_driver);
952         platform_device_unregister(dummy);
953         kfree(dummy_data);
954 }
955 module_exit(ramoops_exit);
956 
957 MODULE_LICENSE("GPL");
958 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
959 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
960 

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