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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.76 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/io.h>
 31 #include <linux/ioport.h>
 32 #include <linux/platform_device.h>
 33 #include <linux/slab.h>
 34 #include <linux/compiler.h>
 35 #include <linux/pstore_ram.h>
 36 #include <linux/of.h>
 37 #include <linux/of_address.h>
 38 
 39 #define RAMOOPS_KERNMSG_HDR "===="
 40 #define MIN_MEM_SIZE 4096UL
 41 
 42 static ulong record_size = MIN_MEM_SIZE;
 43 module_param(record_size, ulong, 0400);
 44 MODULE_PARM_DESC(record_size,
 45                 "size of each dump done on oops/panic");
 46 
 47 static ulong ramoops_console_size = MIN_MEM_SIZE;
 48 module_param_named(console_size, ramoops_console_size, ulong, 0400);
 49 MODULE_PARM_DESC(console_size, "size of kernel console log");
 50 
 51 static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
 52 module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
 53 MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
 54 
 55 static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
 56 module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
 57 MODULE_PARM_DESC(pmsg_size, "size of user space message log");
 58 
 59 static unsigned long long mem_address;
 60 module_param_hw(mem_address, ullong, other, 0400);
 61 MODULE_PARM_DESC(mem_address,
 62                 "start of reserved RAM used to store oops/panic logs");
 63 
 64 static ulong mem_size;
 65 module_param(mem_size, ulong, 0400);
 66 MODULE_PARM_DESC(mem_size,
 67                 "size of reserved RAM used to store oops/panic logs");
 68 
 69 static unsigned int mem_type;
 70 module_param(mem_type, uint, 0600);
 71 MODULE_PARM_DESC(mem_type,
 72                 "set to 1 to try to use unbuffered memory (default 0)");
 73 
 74 static int dump_oops = 1;
 75 module_param(dump_oops, int, 0600);
 76 MODULE_PARM_DESC(dump_oops,
 77                 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
 78 
 79 static int ramoops_ecc;
 80 module_param_named(ecc, ramoops_ecc, int, 0600);
 81 MODULE_PARM_DESC(ramoops_ecc,
 82                 "if non-zero, the option enables ECC support and specifies "
 83                 "ECC buffer size in bytes (1 is a special value, means 16 "
 84                 "bytes ECC)");
 85 
 86 struct ramoops_context {
 87         struct persistent_ram_zone **dprzs;     /* Oops dump zones */
 88         struct persistent_ram_zone *cprz;       /* Console zone */
 89         struct persistent_ram_zone **fprzs;     /* Ftrace zones */
 90         struct persistent_ram_zone *mprz;       /* PMSG zone */
 91         phys_addr_t phys_addr;
 92         unsigned long size;
 93         unsigned int memtype;
 94         size_t record_size;
 95         size_t console_size;
 96         size_t ftrace_size;
 97         size_t pmsg_size;
 98         int dump_oops;
 99         u32 flags;
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 max_ftrace_cnt;
107         unsigned int ftrace_read_cnt;
108         unsigned int pmsg_read_cnt;
109         struct pstore_info pstore;
110 };
111 
112 static struct platform_device *dummy;
113 static struct ramoops_platform_data *dummy_data;
114 
115 static int ramoops_pstore_open(struct pstore_info *psi)
116 {
117         struct ramoops_context *cxt = psi->data;
118 
119         cxt->dump_read_cnt = 0;
120         cxt->console_read_cnt = 0;
121         cxt->ftrace_read_cnt = 0;
122         cxt->pmsg_read_cnt = 0;
123         return 0;
124 }
125 
126 static struct persistent_ram_zone *
127 ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
128                      u64 *id,
129                      enum pstore_type_id *typep, enum pstore_type_id type,
130                      bool update)
131 {
132         struct persistent_ram_zone *prz;
133         int i = (*c)++;
134 
135         /* Give up if we never existed or have hit the end. */
136         if (!przs || 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(struct pstore_record *record)
238 {
239         ssize_t size = 0;
240         struct ramoops_context *cxt = record->psi->data;
241         struct persistent_ram_zone *prz = NULL;
242         int header_length = 0;
243         bool free_prz = false;
244 
245         /*
246          * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
247          * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
248          * valid time stamps, so it is initialized to zero.
249          */
250         record->time.tv_sec = 0;
251         record->time.tv_nsec = 0;
252         record->compressed = false;
253 
254         /* Find the next valid persistent_ram_zone for DMESG */
255         while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
256                 prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
257                                            cxt->max_dump_cnt, &record->id,
258                                            &record->type,
259                                            PSTORE_TYPE_DMESG, 1);
260                 if (!prz_ok(prz))
261                         continue;
262                 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
263                                                       &record->time,
264                                                       &record->compressed);
265                 /* Clear and skip this DMESG record if it has no valid header */
266                 if (!header_length) {
267                         persistent_ram_free_old(prz);
268                         persistent_ram_zap(prz);
269                         prz = NULL;
270                 }
271         }
272 
273         if (!prz_ok(prz))
274                 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
275                                            1, &record->id, &record->type,
276                                            PSTORE_TYPE_CONSOLE, 0);
277 
278         if (!prz_ok(prz))
279                 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
280                                            1, &record->id, &record->type,
281                                            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, &record->id,
288                                         &record->type, 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,
306                                                 &record->id,
307                                                 &record->type,
308                                                 PSTORE_TYPE_FTRACE, 0);
309 
310                                 if (!prz_ok(prz_next))
311                                         continue;
312 
313                                 tmp_prz->ecc_info = prz_next->ecc_info;
314                                 tmp_prz->corrected_bytes +=
315                                                 prz_next->corrected_bytes;
316                                 tmp_prz->bad_blocks += prz_next->bad_blocks;
317                                 size = ftrace_log_combine(tmp_prz, prz_next);
318                                 if (size)
319                                         goto out;
320                         }
321                         record->id = 0;
322                         prz = tmp_prz;
323                 }
324         }
325 
326         if (!prz_ok(prz)) {
327                 size = 0;
328                 goto out;
329         }
330 
331         size = persistent_ram_old_size(prz) - header_length;
332 
333         /* ECC correction notice */
334         record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
335 
336         record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
337         if (record->buf == NULL) {
338                 size = -ENOMEM;
339                 goto out;
340         }
341 
342         memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
343                size);
344 
345         persistent_ram_ecc_string(prz, record->buf + size,
346                                   record->ecc_notice_size + 1);
347 
348 out:
349         if (free_prz) {
350                 kfree(prz->old_log);
351                 kfree(prz);
352         }
353 
354         return size;
355 }
356 
357 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
358                                      struct pstore_record *record)
359 {
360         char *hdr;
361         size_t len;
362 
363         hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
364                 record->time.tv_sec,
365                 record->time.tv_nsec / 1000,
366                 record->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(struct pstore_record *record)
376 {
377         struct ramoops_context *cxt = record->psi->data;
378         struct persistent_ram_zone *prz;
379         size_t size, hlen;
380 
381         if (record->type == PSTORE_TYPE_CONSOLE) {
382                 if (!cxt->cprz)
383                         return -ENOMEM;
384                 persistent_ram_write(cxt->cprz, record->buf, record->size);
385                 return 0;
386         } else if (record->type == PSTORE_TYPE_FTRACE) {
387                 int zonenum;
388 
389                 if (!cxt->fprzs)
390                         return -ENOMEM;
391                 /*
392                  * Choose zone by if we're using per-cpu buffers.
393                  */
394                 if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
395                         zonenum = smp_processor_id();
396                 else
397                         zonenum = 0;
398 
399                 persistent_ram_write(cxt->fprzs[zonenum], record->buf,
400                                      record->size);
401                 return 0;
402         } else if (record->type == PSTORE_TYPE_PMSG) {
403                 pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
404                 return -EINVAL;
405         }
406 
407         if (record->type != PSTORE_TYPE_DMESG)
408                 return -EINVAL;
409 
410         /*
411          * Out of the various dmesg dump types, ramoops is currently designed
412          * to only store crash logs, rather than storing general kernel logs.
413          */
414         if (record->reason != KMSG_DUMP_OOPS &&
415             record->reason != KMSG_DUMP_PANIC)
416                 return -EINVAL;
417 
418         /* Skip Oopes when configured to do so. */
419         if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
420                 return -EINVAL;
421 
422         /*
423          * Explicitly only take the first part of any new crash.
424          * If our buffer is larger than kmsg_bytes, this can never happen,
425          * and if our buffer is smaller than kmsg_bytes, we don't want the
426          * report split across multiple records.
427          */
428         if (record->part != 1)
429                 return -ENOSPC;
430 
431         if (!cxt->dprzs)
432                 return -ENOSPC;
433 
434         prz = cxt->dprzs[cxt->dump_write_cnt];
435 
436         /* Build header and append record contents. */
437         hlen = ramoops_write_kmsg_hdr(prz, record);
438         size = record->size;
439         if (size + hlen > prz->buffer_size)
440                 size = prz->buffer_size - hlen;
441         persistent_ram_write(prz, record->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_user(struct pstore_record *record,
449                                              const char __user *buf)
450 {
451         if (record->type == PSTORE_TYPE_PMSG) {
452                 struct ramoops_context *cxt = record->psi->data;
453 
454                 if (!cxt->mprz)
455                         return -ENOMEM;
456                 return persistent_ram_write_user(cxt->mprz, buf, record->size);
457         }
458 
459         return -EINVAL;
460 }
461 
462 static int ramoops_pstore_erase(struct pstore_record *record)
463 {
464         struct ramoops_context *cxt = record->psi->data;
465         struct persistent_ram_zone *prz;
466 
467         switch (record->type) {
468         case PSTORE_TYPE_DMESG:
469                 if (record->id >= cxt->max_dump_cnt)
470                         return -EINVAL;
471                 prz = cxt->dprzs[record->id];
472                 break;
473         case PSTORE_TYPE_CONSOLE:
474                 prz = cxt->cprz;
475                 break;
476         case PSTORE_TYPE_FTRACE:
477                 if (record->id >= cxt->max_ftrace_cnt)
478                         return -EINVAL;
479                 prz = cxt->fprzs[record->id];
480                 break;
481         case PSTORE_TYPE_PMSG:
482                 prz = cxt->mprz;
483                 break;
484         default:
485                 return -EINVAL;
486         }
487 
488         persistent_ram_free_old(prz);
489         persistent_ram_zap(prz);
490 
491         return 0;
492 }
493 
494 static struct ramoops_context oops_cxt = {
495         .pstore = {
496                 .owner  = THIS_MODULE,
497                 .name   = "ramoops",
498                 .open   = ramoops_pstore_open,
499                 .read   = ramoops_pstore_read,
500                 .write  = ramoops_pstore_write,
501                 .write_user     = ramoops_pstore_write_user,
502                 .erase  = ramoops_pstore_erase,
503         },
504 };
505 
506 static void ramoops_free_przs(struct ramoops_context *cxt)
507 {
508         int i;
509 
510         /* Free dump PRZs */
511         if (cxt->dprzs) {
512                 for (i = 0; i < cxt->max_dump_cnt; i++)
513                         persistent_ram_free(cxt->dprzs[i]);
514 
515                 kfree(cxt->dprzs);
516                 cxt->max_dump_cnt = 0;
517         }
518 
519         /* Free ftrace PRZs */
520         if (cxt->fprzs) {
521                 for (i = 0; i < cxt->max_ftrace_cnt; i++)
522                         persistent_ram_free(cxt->fprzs[i]);
523                 kfree(cxt->fprzs);
524                 cxt->max_ftrace_cnt = 0;
525         }
526 }
527 
528 static int ramoops_init_przs(const char *name,
529                              struct device *dev, struct ramoops_context *cxt,
530                              struct persistent_ram_zone ***przs,
531                              phys_addr_t *paddr, size_t mem_sz,
532                              ssize_t record_size,
533                              unsigned int *cnt, u32 sig, u32 flags)
534 {
535         int err = -ENOMEM;
536         int i;
537         size_t zone_sz;
538         struct persistent_ram_zone **prz_ar;
539 
540         /* Allocate nothing for 0 mem_sz or 0 record_size. */
541         if (mem_sz == 0 || record_size == 0) {
542                 *cnt = 0;
543                 return 0;
544         }
545 
546         /*
547          * If we have a negative record size, calculate it based on
548          * mem_sz / *cnt. If we have a positive record size, calculate
549          * cnt from mem_sz / record_size.
550          */
551         if (record_size < 0) {
552                 if (*cnt == 0)
553                         return 0;
554                 record_size = mem_sz / *cnt;
555                 if (record_size == 0) {
556                         dev_err(dev, "%s record size == 0 (%zu / %u)\n",
557                                 name, mem_sz, *cnt);
558                         goto fail;
559                 }
560         } else {
561                 *cnt = mem_sz / record_size;
562                 if (*cnt == 0) {
563                         dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
564                                 name, mem_sz, record_size);
565                         goto fail;
566                 }
567         }
568 
569         if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
570                 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
571                         name,
572                         mem_sz, (unsigned long long)*paddr,
573                         cxt->size, (unsigned long long)cxt->phys_addr);
574                 goto fail;
575         }
576 
577         zone_sz = mem_sz / *cnt;
578         if (!zone_sz) {
579                 dev_err(dev, "%s zone size == 0\n", name);
580                 goto fail;
581         }
582 
583         prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
584         if (!prz_ar)
585                 goto fail;
586 
587         for (i = 0; i < *cnt; i++) {
588                 prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
589                                                   &cxt->ecc_info,
590                                                   cxt->memtype, flags);
591                 if (IS_ERR(prz_ar[i])) {
592                         err = PTR_ERR(prz_ar[i]);
593                         dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
594                                 name, record_size,
595                                 (unsigned long long)*paddr, err);
596 
597                         while (i > 0) {
598                                 i--;
599                                 persistent_ram_free(prz_ar[i]);
600                         }
601                         kfree(prz_ar);
602                         goto fail;
603                 }
604                 *paddr += zone_sz;
605         }
606 
607         *przs = prz_ar;
608         return 0;
609 
610 fail:
611         *cnt = 0;
612         return err;
613 }
614 
615 static int ramoops_init_prz(const char *name,
616                             struct device *dev, struct ramoops_context *cxt,
617                             struct persistent_ram_zone **prz,
618                             phys_addr_t *paddr, size_t sz, u32 sig)
619 {
620         if (!sz)
621                 return 0;
622 
623         if (*paddr + sz - cxt->phys_addr > cxt->size) {
624                 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
625                         name, sz, (unsigned long long)*paddr,
626                         cxt->size, (unsigned long long)cxt->phys_addr);
627                 return -ENOMEM;
628         }
629 
630         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
631                                   cxt->memtype, 0);
632         if (IS_ERR(*prz)) {
633                 int err = PTR_ERR(*prz);
634 
635                 dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
636                         name, sz, (unsigned long long)*paddr, err);
637                 return err;
638         }
639 
640         persistent_ram_zap(*prz);
641 
642         *paddr += sz;
643 
644         return 0;
645 }
646 
647 static int ramoops_parse_dt_size(struct platform_device *pdev,
648                                  const char *propname, u32 *value)
649 {
650         u32 val32 = 0;
651         int ret;
652 
653         ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
654         if (ret < 0 && ret != -EINVAL) {
655                 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
656                         propname, ret);
657                 return ret;
658         }
659 
660         if (val32 > INT_MAX) {
661                 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
662                 return -EOVERFLOW;
663         }
664 
665         *value = val32;
666         return 0;
667 }
668 
669 static int ramoops_parse_dt(struct platform_device *pdev,
670                             struct ramoops_platform_data *pdata)
671 {
672         struct device_node *of_node = pdev->dev.of_node;
673         struct resource *res;
674         u32 value;
675         int ret;
676 
677         dev_dbg(&pdev->dev, "using Device Tree\n");
678 
679         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
680         if (!res) {
681                 dev_err(&pdev->dev,
682                         "failed to locate DT /reserved-memory resource\n");
683                 return -EINVAL;
684         }
685 
686         pdata->mem_size = resource_size(res);
687         pdata->mem_address = res->start;
688         pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
689         pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
690 
691 #define parse_size(name, field) {                                       \
692                 ret = ramoops_parse_dt_size(pdev, name, &value);        \
693                 if (ret < 0)                                            \
694                         return ret;                                     \
695                 field = value;                                          \
696         }
697 
698         parse_size("record-size", pdata->record_size);
699         parse_size("console-size", pdata->console_size);
700         parse_size("ftrace-size", pdata->ftrace_size);
701         parse_size("pmsg-size", pdata->pmsg_size);
702         parse_size("ecc-size", pdata->ecc_info.ecc_size);
703         parse_size("flags", pdata->flags);
704 
705 #undef parse_size
706 
707         return 0;
708 }
709 
710 static int ramoops_probe(struct platform_device *pdev)
711 {
712         struct device *dev = &pdev->dev;
713         struct ramoops_platform_data *pdata = dev->platform_data;
714         struct ramoops_context *cxt = &oops_cxt;
715         size_t dump_mem_sz;
716         phys_addr_t paddr;
717         int err = -EINVAL;
718 
719         if (dev_of_node(dev) && !pdata) {
720                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
721                 if (!pdata) {
722                         pr_err("cannot allocate platform data buffer\n");
723                         err = -ENOMEM;
724                         goto fail_out;
725                 }
726 
727                 err = ramoops_parse_dt(pdev, pdata);
728                 if (err < 0)
729                         goto fail_out;
730         }
731 
732         /*
733          * Only a single ramoops area allowed at a time, so fail extra
734          * probes.
735          */
736         if (cxt->max_dump_cnt) {
737                 pr_err("already initialized\n");
738                 goto fail_out;
739         }
740 
741         /* Make sure we didn't get bogus platform data pointer. */
742         if (!pdata) {
743                 pr_err("NULL platform data\n");
744                 goto fail_out;
745         }
746 
747         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
748                         !pdata->ftrace_size && !pdata->pmsg_size)) {
749                 pr_err("The memory size and the record/console size must be "
750                         "non-zero\n");
751                 goto fail_out;
752         }
753 
754         if (pdata->record_size && !is_power_of_2(pdata->record_size))
755                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
756         if (pdata->console_size && !is_power_of_2(pdata->console_size))
757                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
758         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
759                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
760         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
761                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
762 
763         cxt->size = pdata->mem_size;
764         cxt->phys_addr = pdata->mem_address;
765         cxt->memtype = pdata->mem_type;
766         cxt->record_size = pdata->record_size;
767         cxt->console_size = pdata->console_size;
768         cxt->ftrace_size = pdata->ftrace_size;
769         cxt->pmsg_size = pdata->pmsg_size;
770         cxt->dump_oops = pdata->dump_oops;
771         cxt->flags = pdata->flags;
772         cxt->ecc_info = pdata->ecc_info;
773 
774         paddr = cxt->phys_addr;
775 
776         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
777                         - cxt->pmsg_size;
778         err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
779                                 dump_mem_sz, cxt->record_size,
780                                 &cxt->max_dump_cnt, 0, 0);
781         if (err)
782                 goto fail_out;
783 
784         err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
785                                cxt->console_size, 0);
786         if (err)
787                 goto fail_init_cprz;
788 
789         cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
790                                 ? nr_cpu_ids
791                                 : 1;
792         err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
793                                 cxt->ftrace_size, -1,
794                                 &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
795                                 (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
796                                         ? PRZ_FLAG_NO_LOCK : 0);
797         if (err)
798                 goto fail_init_fprz;
799 
800         err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
801                                 cxt->pmsg_size, 0);
802         if (err)
803                 goto fail_init_mprz;
804 
805         cxt->pstore.data = cxt;
806         /*
807          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
808          * have to handle dumps, we must have at least record_size buffer. And
809          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
810          * ZERO_SIZE_PTR).
811          */
812         if (cxt->console_size)
813                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
814         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
815         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
816         if (!cxt->pstore.buf) {
817                 pr_err("cannot allocate pstore buffer\n");
818                 err = -ENOMEM;
819                 goto fail_clear;
820         }
821         spin_lock_init(&cxt->pstore.buf_lock);
822 
823         cxt->pstore.flags = PSTORE_FLAGS_DMESG;
824         if (cxt->console_size)
825                 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
826         if (cxt->ftrace_size)
827                 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
828         if (cxt->pmsg_size)
829                 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
830 
831         err = pstore_register(&cxt->pstore);
832         if (err) {
833                 pr_err("registering with pstore failed\n");
834                 goto fail_buf;
835         }
836 
837         /*
838          * Update the module parameter variables as well so they are visible
839          * through /sys/module/ramoops/parameters/
840          */
841         mem_size = pdata->mem_size;
842         mem_address = pdata->mem_address;
843         record_size = pdata->record_size;
844         dump_oops = pdata->dump_oops;
845         ramoops_console_size = pdata->console_size;
846         ramoops_pmsg_size = pdata->pmsg_size;
847         ramoops_ftrace_size = pdata->ftrace_size;
848 
849         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
850                 cxt->size, (unsigned long long)cxt->phys_addr,
851                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
852 
853         return 0;
854 
855 fail_buf:
856         kfree(cxt->pstore.buf);
857 fail_clear:
858         cxt->pstore.bufsize = 0;
859         persistent_ram_free(cxt->mprz);
860 fail_init_mprz:
861 fail_init_fprz:
862         persistent_ram_free(cxt->cprz);
863 fail_init_cprz:
864         ramoops_free_przs(cxt);
865 fail_out:
866         return err;
867 }
868 
869 static int ramoops_remove(struct platform_device *pdev)
870 {
871         struct ramoops_context *cxt = &oops_cxt;
872 
873         pstore_unregister(&cxt->pstore);
874 
875         kfree(cxt->pstore.buf);
876         cxt->pstore.bufsize = 0;
877 
878         persistent_ram_free(cxt->mprz);
879         persistent_ram_free(cxt->cprz);
880         ramoops_free_przs(cxt);
881 
882         return 0;
883 }
884 
885 static const struct of_device_id dt_match[] = {
886         { .compatible = "ramoops" },
887         {}
888 };
889 
890 static struct platform_driver ramoops_driver = {
891         .probe          = ramoops_probe,
892         .remove         = ramoops_remove,
893         .driver         = {
894                 .name           = "ramoops",
895                 .of_match_table = dt_match,
896         },
897 };
898 
899 static void ramoops_register_dummy(void)
900 {
901         if (!mem_size)
902                 return;
903 
904         pr_info("using module parameters\n");
905 
906         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
907         if (!dummy_data) {
908                 pr_info("could not allocate pdata\n");
909                 return;
910         }
911 
912         dummy_data->mem_size = mem_size;
913         dummy_data->mem_address = mem_address;
914         dummy_data->mem_type = mem_type;
915         dummy_data->record_size = record_size;
916         dummy_data->console_size = ramoops_console_size;
917         dummy_data->ftrace_size = ramoops_ftrace_size;
918         dummy_data->pmsg_size = ramoops_pmsg_size;
919         dummy_data->dump_oops = dump_oops;
920         dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
921 
922         /*
923          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
924          * (using 1 byte for ECC isn't much of use anyway).
925          */
926         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
927 
928         dummy = platform_device_register_data(NULL, "ramoops", -1,
929                         dummy_data, sizeof(struct ramoops_platform_data));
930         if (IS_ERR(dummy)) {
931                 pr_info("could not create platform device: %ld\n",
932                         PTR_ERR(dummy));
933         }
934 }
935 
936 static int __init ramoops_init(void)
937 {
938         ramoops_register_dummy();
939         return platform_driver_register(&ramoops_driver);
940 }
941 postcore_initcall(ramoops_init);
942 
943 static void __exit ramoops_exit(void)
944 {
945         platform_driver_unregister(&ramoops_driver);
946         platform_device_unregister(dummy);
947         kfree(dummy_data);
948 }
949 module_exit(ramoops_exit);
950 
951 MODULE_LICENSE("GPL");
952 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
953 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
954 

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