kernel/fs/pstore/ram.c

   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
  38 #define RAMOOPS_KERNMSG_HDR "===="
  39 #define MIN_MEM_SIZE 4096UL
  40
  41 static ulong record_size = MIN_MEM_SIZE;
  42 module_param(record_size, ulong, 0400);
  43 MODULE_PARM_DESC(record_size,
  44                 "size of each dump done on oops/panic");
  45
  46 static ulong ramoops_console_size = MIN_MEM_SIZE;
  47 module_param_named(console_size, ramoops_console_size, ulong, 0400);
  48 MODULE_PARM_DESC(console_size, "size of kernel console log");
  49
  50 static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
  51 module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
  52 MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
  53
  54 static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
  55 module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
  56 MODULE_PARM_DESC(pmsg_size, "size of user space message log");
  57
  58 static ulong mem_address;
  59 module_param(mem_address, ulong, 0400);
  60 MODULE_PARM_DESC(mem_address,
  61                 "start of reserved RAM used to store oops/panic logs");
  62
  63 static ulong mem_size;
  64 module_param(mem_size, ulong, 0400);
  65 MODULE_PARM_DESC(mem_size,
  66                 "size of reserved RAM used to store oops/panic logs");
  67
  68 static unsigned int mem_type;
  69 module_param(mem_type, uint, 0600);
  70 MODULE_PARM_DESC(mem_type,
  71                 "set to 1 to try to use unbuffered memory (default 0)");
  72
  73 static int dump_oops = 1;
  74 module_param(dump_oops, int, 0600);
  75 MODULE_PARM_DESC(dump_oops,
  76                 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
  77
  78 static int ramoops_ecc;
  79 module_param_named(ecc, ramoops_ecc, int, 0600);
  80 MODULE_PARM_DESC(ramoops_ecc,
  81                 "if non-zero, the option enables ECC support and specifies "
  82                 "ECC buffer size in bytes (1 is a special value, means 16 "
  83                 "bytes ECC)");
  84
  85 struct ramoops_context {
  86         struct persistent_ram_zone **przs;
  87         struct persistent_ram_zone *cprz;
  88         struct persistent_ram_zone *fprz;
  89         struct persistent_ram_zone *mprz;
  90         phys_addr_t phys_addr;
  91         unsigned long size;
  92         unsigned int memtype;
  93         size_t record_size;
  94         size_t console_size;
  95         size_t ftrace_size;
  96         size_t pmsg_size;
  97         int dump_oops;
  98         struct persistent_ram_ecc_info ecc_info;
  99         unsigned int max_dump_cnt;
 100         unsigned int dump_write_cnt;
 101         /* _read_cnt need clear on ramoops_pstore_open */
 102         unsigned int dump_read_cnt;
 103         unsigned int console_read_cnt;
 104         unsigned int ftrace_read_cnt;
 105         unsigned int pmsg_read_cnt;
 106         struct pstore_info pstore;
 107 };
 108
 109 static struct platform_device *dummy;
 110 static struct ramoops_platform_data *dummy_data;
 111
 112 static int ramoops_pstore_open(struct pstore_info *psi)
 113 {
 114         struct ramoops_context *cxt = psi->data;
 115
 116         cxt->dump_read_cnt = 0;
 117         cxt->console_read_cnt = 0;
 118         cxt->ftrace_read_cnt = 0;
 119         cxt->pmsg_read_cnt = 0;
 120         return 0;
 121 }
 122
 123 static struct persistent_ram_zone *
 124 ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
 125                      u64 *id,
 126                      enum pstore_type_id *typep, enum pstore_type_id type,
 127                      bool update)
 128 {
 129         struct persistent_ram_zone *prz;
 130         int i = (*c)++;
 131
 132         if (i >= max)
 133                 return NULL;
 134
 135         prz = przs[i];
 136         if (!prz)
 137                 return NULL;
 138
 139         /* Update old/shadowed buffer. */
 140         if (update)
 141                 persistent_ram_save_old(prz);
 142
 143         if (!persistent_ram_old_size(prz))
 144                 return NULL;
 145
 146         *typep = type;
 147         *id = i;
 148
 149         return prz;
 150 }
 151
 152 static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
 153                                   bool *compressed)
 154 {
 155         char data_type;
 156         int header_length = 0;
 157
 158         if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
 159                         &time->tv_nsec, &data_type, &header_length) == 3) {
 160                 if (data_type == 'C')
 161                         *compressed = true;
 162                 else
 163                         *compressed = false;
 164         } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
 165                         &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
 166                         *compressed = false;
 167         } else {
 168                 time->tv_sec = 0;
 169                 time->tv_nsec = 0;
 170                 *compressed = false;
 171         }
 172         return header_length;
 173 }
 174
 175 static bool prz_ok(struct persistent_ram_zone *prz)
 176 {
 177         return !!prz && !!(persistent_ram_old_size(prz) +
 178                            persistent_ram_ecc_string(prz, NULL, 0));
 179 }
 180
 181 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
 182                                    int *count, struct timespec *time,
 183                                    char **buf, bool *compressed,
 184                                    struct pstore_info *psi)
 185 {
 186         ssize_t size;
 187         ssize_t ecc_notice_size;
 188         struct ramoops_context *cxt = psi->data;
 189         struct persistent_ram_zone *prz = NULL;
 190         int header_length = 0;
 191
 192         /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
 193          * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
 194          * valid time stamps, so it is initialized to zero.
 195          */
 196         time->tv_sec = 0;
 197         time->tv_nsec = 0;
 198         *compressed = false;
 199
 200         /* Find the next valid persistent_ram_zone for DMESG */
 201         while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
 202                 prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
 203                                            cxt->max_dump_cnt, id, type,
 204                                            PSTORE_TYPE_DMESG, 1);
 205                 if (!prz_ok(prz))
 206                         continue;
 207                 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
 208                                                       time, compressed);
 209                 /* Clear and skip this DMESG record if it has no valid header */
 210                 if (!header_length) {
 211                         persistent_ram_free_old(prz);
 212                         persistent_ram_zap(prz);
 213                         prz = NULL;
 214                 }
 215         }
 216
 217         if (!prz_ok(prz))
 218                 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
 219                                            1, id, type, PSTORE_TYPE_CONSOLE, 0);
 220         if (!prz_ok(prz))
 221                 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
 222                                            1, id, type, PSTORE_TYPE_FTRACE, 0);
 223         if (!prz_ok(prz))
 224                 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
 225                                            1, id, type, PSTORE_TYPE_PMSG, 0);
 226         if (!prz_ok(prz))
 227                 return 0;
 228
 229         size = persistent_ram_old_size(prz) - header_length;
 230
 231         /* ECC correction notice */
 232         ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
 233
 234         *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
 235         if (*buf == NULL)
 236                 return -ENOMEM;
 237
 238         memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
 239         persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
 240
 241         return size + ecc_notice_size;
 242 }
 243
 244 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
 245                                      bool compressed)
 246 {
 247         char *hdr;
 248         struct timespec timestamp;
 249         size_t len;
 250
 251         /* Report zeroed timestamp if called before timekeeping has resumed. */
 252         if (__getnstimeofday(&timestamp)) {
 253                 timestamp.tv_sec = 0;
 254                 timestamp.tv_nsec = 0;
 255         }
 256         hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
 257                 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
 258                 compressed ? 'C' : 'D');
 259         WARN_ON_ONCE(!hdr);
 260         len = hdr ? strlen(hdr) : 0;
 261         persistent_ram_write(prz, hdr, len);
 262         kfree(hdr);
 263
 264         return len;
 265 }
 266
 267 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
 268                                             enum kmsg_dump_reason reason,
 269                                             u64 *id, unsigned int part,
 270                                             const char *buf,
 271                                             bool compressed, size_t size,
 272                                             struct pstore_info *psi)
 273 {
 274         struct ramoops_context *cxt = psi->data;
 275         struct persistent_ram_zone *prz;
 276         size_t hlen;
 277
 278         if (type == PSTORE_TYPE_CONSOLE) {
 279                 if (!cxt->cprz)
 280                         return -ENOMEM;
 281                 persistent_ram_write(cxt->cprz, buf, size);
 282                 return 0;
 283         } else if (type == PSTORE_TYPE_FTRACE) {
 284                 if (!cxt->fprz)
 285                         return -ENOMEM;
 286                 persistent_ram_write(cxt->fprz, buf, size);
 287                 return 0;
 288         } else if (type == PSTORE_TYPE_PMSG) {
 289                 if (!cxt->mprz)
 290                         return -ENOMEM;
 291                 persistent_ram_write(cxt->mprz, buf, size);
 292                 return 0;
 293         }
 294
 295         if (type != PSTORE_TYPE_DMESG)
 296                 return -EINVAL;
 297
 298         /* Out of the various dmesg dump types, ramoops is currently designed
 299          * to only store crash logs, rather than storing general kernel logs.
 300          */
 301         if (reason != KMSG_DUMP_OOPS &&
 302             reason != KMSG_DUMP_PANIC)
 303                 return -EINVAL;
 304
 305         /* Skip Oopes when configured to do so. */
 306         if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
 307                 return -EINVAL;
 308
 309         /* Explicitly only take the first part of any new crash.
 310          * If our buffer is larger than kmsg_bytes, this can never happen,
 311          * and if our buffer is smaller than kmsg_bytes, we don't want the
 312          * report split across multiple records.
 313          */
 314         if (part != 1)
 315                 return -ENOSPC;
 316
 317         if (!cxt->przs)
 318                 return -ENOSPC;
 319
 320         prz = cxt->przs[cxt->dump_write_cnt];
 321
 322         hlen = ramoops_write_kmsg_hdr(prz, compressed);
 323         if (size + hlen > prz->buffer_size)
 324                 size = prz->buffer_size - hlen;
 325         persistent_ram_write(prz, buf, size);
 326
 327         cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
 328
 329         return 0;
 330 }
 331
 332 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
 333                                 struct timespec time, struct pstore_info *psi)
 334 {
 335         struct ramoops_context *cxt = psi->data;
 336         struct persistent_ram_zone *prz;
 337
 338         switch (type) {
 339         case PSTORE_TYPE_DMESG:
 340                 if (id >= cxt->max_dump_cnt)
 341                         return -EINVAL;
 342                 prz = cxt->przs[id];
 343                 break;
 344         case PSTORE_TYPE_CONSOLE:
 345                 prz = cxt->cprz;
 346                 break;
 347         case PSTORE_TYPE_FTRACE:
 348                 prz = cxt->fprz;
 349                 break;
 350         case PSTORE_TYPE_PMSG:
 351                 prz = cxt->mprz;
 352                 break;
 353         default:
 354                 return -EINVAL;
 355         }
 356
 357         persistent_ram_free_old(prz);
 358         persistent_ram_zap(prz);
 359
 360         return 0;
 361 }
 362
 363 static struct ramoops_context oops_cxt = {
 364         .pstore = {
 365                 .owner  = THIS_MODULE,
 366                 .name   = "ramoops",
 367                 .open   = ramoops_pstore_open,
 368                 .read   = ramoops_pstore_read,
 369                 .write_buf      = ramoops_pstore_write_buf,
 370                 .erase  = ramoops_pstore_erase,
 371         },
 372 };
 373
 374 static void ramoops_free_przs(struct ramoops_context *cxt)
 375 {
 376         int i;
 377
 378         cxt->max_dump_cnt = 0;
 379         if (!cxt->przs)
 380                 return;
 381
 382         for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++)
 383                 persistent_ram_free(cxt->przs[i]);
 384         kfree(cxt->przs);
 385 }
 386
 387 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
 388                              phys_addr_t *paddr, size_t dump_mem_sz)
 389 {
 390         int err = -ENOMEM;
 391         int i;
 392
 393         if (!cxt->record_size)
 394                 return 0;
 395
 396         if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
 397                 dev_err(dev, "no room for dumps\n");
 398                 return -ENOMEM;
 399         }
 400
 401         cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
 402         if (!cxt->max_dump_cnt)
 403                 return -ENOMEM;
 404
 405         cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
 406                              GFP_KERNEL);
 407         if (!cxt->przs) {
 408                 dev_err(dev, "failed to initialize a prz array for dumps\n");
 409                 goto fail_prz;
 410         }
 411
 412         for (i = 0; i < cxt->max_dump_cnt; i++) {
 413                 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
 414                                                   &cxt->ecc_info,
 415                                                   cxt->memtype);
 416                 if (IS_ERR(cxt->przs[i])) {
 417                         err = PTR_ERR(cxt->przs[i]);
 418                         dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
 419                                 cxt->record_size, (unsigned long long)*paddr, err);
 420                         goto fail_prz;
 421                 }
 422                 *paddr += cxt->record_size;
 423         }
 424
 425         return 0;
 426 fail_prz:
 427         ramoops_free_przs(cxt);
 428         return err;
 429 }
 430
 431 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
 432                             struct persistent_ram_zone **prz,
 433                             phys_addr_t *paddr, size_t sz, u32 sig)
 434 {
 435         if (!sz)
 436                 return 0;
 437
 438         if (*paddr + sz - cxt->phys_addr > cxt->size) {
 439                 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
 440                         sz, (unsigned long long)*paddr,
 441                         cxt->size, (unsigned long long)cxt->phys_addr);
 442                 return -ENOMEM;
 443         }
 444
 445         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype);
 446         if (IS_ERR(*prz)) {
 447                 int err = PTR_ERR(*prz);
 448
 449                 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
 450                         sz, (unsigned long long)*paddr, err);
 451                 return err;
 452         }
 453
 454         persistent_ram_zap(*prz);
 455
 456         *paddr += sz;
 457
 458         return 0;
 459 }
 460
 461 static int ramoops_probe(struct platform_device *pdev)
 462 {
 463         struct device *dev = &pdev->dev;
 464         struct ramoops_platform_data *pdata = pdev->dev.platform_data;
 465         struct ramoops_context *cxt = &oops_cxt;
 466         size_t dump_mem_sz;
 467         phys_addr_t paddr;
 468         int err = -EINVAL;
 469
 470         /* Only a single ramoops area allowed at a time, so fail extra
 471          * probes.
 472          */
 473         if (cxt->max_dump_cnt)
 474                 goto fail_out;
 475
 476         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
 477                         !pdata->ftrace_size && !pdata->pmsg_size)) {
 478                 pr_err("The memory size and the record/console size must be "
 479                         "non-zero\n");
 480                 goto fail_out;
 481         }
 482
 483         if (pdata->record_size && !is_power_of_2(pdata->record_size))
 484                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
 485         if (pdata->console_size && !is_power_of_2(pdata->console_size))
 486                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
 487         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
 488                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
 489         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
 490                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
 491
 492         cxt->size = pdata->mem_size;
 493         cxt->phys_addr = pdata->mem_address;
 494         cxt->memtype = pdata->mem_type;
 495         cxt->record_size = pdata->record_size;
 496         cxt->console_size = pdata->console_size;
 497         cxt->ftrace_size = pdata->ftrace_size;
 498         cxt->pmsg_size = pdata->pmsg_size;
 499         cxt->dump_oops = pdata->dump_oops;
 500         cxt->ecc_info = pdata->ecc_info;
 501
 502         paddr = cxt->phys_addr;
 503
 504         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
 505                         - cxt->pmsg_size;
 506         err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
 507         if (err)
 508                 goto fail_out;
 509
 510         err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
 511                                cxt->console_size, 0);
 512         if (err)
 513                 goto fail_init_cprz;
 514
 515         err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
 516                                LINUX_VERSION_CODE);
 517         if (err)
 518                 goto fail_init_fprz;
 519
 520         err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
 521         if (err)
 522                 goto fail_init_mprz;
 523
 524         cxt->pstore.data = cxt;
 525         /*
 526          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
 527          * have to handle dumps, we must have at least record_size buffer. And
 528          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
 529          * ZERO_SIZE_PTR).
 530          */
 531         if (cxt->console_size)
 532                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
 533         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
 534         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
 535         spin_lock_init(&cxt->pstore.buf_lock);
 536         if (!cxt->pstore.buf) {
 537                 pr_err("cannot allocate pstore buffer\n");
 538                 err = -ENOMEM;
 539                 goto fail_clear;
 540         }
 541
 542         err = pstore_register(&cxt->pstore);
 543         if (err) {
 544                 pr_err("registering with pstore failed\n");
 545                 goto fail_buf;
 546         }
 547
 548         /*
 549          * Update the module parameter variables as well so they are visible
 550          * through /sys/module/ramoops/parameters/
 551          */
 552         mem_size = pdata->mem_size;
 553         mem_address = pdata->mem_address;
 554         record_size = pdata->record_size;
 555         dump_oops = pdata->dump_oops;
 556         ramoops_console_size = pdata->console_size;
 557         ramoops_pmsg_size = pdata->pmsg_size;
 558         ramoops_ftrace_size = pdata->ftrace_size;
 559
 560         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
 561                 cxt->size, (unsigned long long)cxt->phys_addr,
 562                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
 563
 564         return 0;
 565
 566 fail_buf:
 567         kfree(cxt->pstore.buf);
 568 fail_clear:
 569         cxt->pstore.bufsize = 0;
 570         kfree(cxt->mprz);
 571 fail_init_mprz:
 572         kfree(cxt->fprz);
 573 fail_init_fprz:
 574         kfree(cxt->cprz);
 575 fail_init_cprz:
 576         ramoops_free_przs(cxt);
 577 fail_out:
 578         return err;
 579 }
 580
 581 static int ramoops_remove(struct platform_device *pdev)
 582 {
 583         struct ramoops_context *cxt = &oops_cxt;
 584
 585         pstore_unregister(&cxt->pstore);
 586         cxt->max_dump_cnt = 0;
 587
 588         kfree(cxt->pstore.buf);
 589         cxt->pstore.bufsize = 0;
 590
 591         persistent_ram_free(cxt->mprz);
 592         persistent_ram_free(cxt->fprz);
 593         persistent_ram_free(cxt->cprz);
 594         ramoops_free_przs(cxt);
 595
 596         return 0;
 597 }
 598
 599 static struct platform_driver ramoops_driver = {
 600         .probe          = ramoops_probe,
 601         .remove         = ramoops_remove,
 602         .driver         = {
 603                 .name   = "ramoops",
 604         },
 605 };
 606
 607 static void ramoops_register_dummy(void)
 608 {
 609         if (!mem_size)
 610                 return;
 611
 612         pr_info("using module parameters\n");
 613
 614         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
 615         if (!dummy_data) {
 616                 pr_info("could not allocate pdata\n");
 617                 return;
 618         }
 619
 620         dummy_data->mem_size = mem_size;
 621         dummy_data->mem_address = mem_address;
 622         dummy_data->mem_type = mem_type;
 623         dummy_data->record_size = record_size;
 624         dummy_data->console_size = ramoops_console_size;
 625         dummy_data->ftrace_size = ramoops_ftrace_size;
 626         dummy_data->pmsg_size = ramoops_pmsg_size;
 627         dummy_data->dump_oops = dump_oops;
 628         /*
 629          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
 630          * (using 1 byte for ECC isn't much of use anyway).
 631          */
 632         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
 633
 634         dummy = platform_device_register_data(NULL, "ramoops", -1,
 635                         dummy_data, sizeof(struct ramoops_platform_data));
 636         if (IS_ERR(dummy)) {
 637                 pr_info("could not create platform device: %ld\n",
 638                         PTR_ERR(dummy));
 639         }
 640 }
 641
 642 static int __init ramoops_init(void)
 643 {
 644         ramoops_register_dummy();
 645         return platform_driver_register(&ramoops_driver);
 646 }
 647 postcore_initcall(ramoops_init);
 648
 649 static void __exit ramoops_exit(void)
 650 {
 651         platform_driver_unregister(&ramoops_driver);
 652         platform_device_unregister(dummy);
 653         kfree(dummy_data);
 654 }
 655 module_exit(ramoops_exit);
 656
 657 MODULE_LICENSE("GPL");
 658 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
 659 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");