1 /* 2 * RAM Oops/Panic logger 3 * 4 * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> 5 * Copyright (C) 2011 Kees Cook <keescook@chromium.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2 as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 19 * 02110-1301 USA 20 * 21 */ 22 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #include <linux/kernel.h> 26 #include <linux/err.h> 27 #include <linux/module.h> 28 #include <linux/version.h> 29 #include <linux/pstore.h> 30 #include <linux/time.h> 31 #include <linux/io.h> 32 #include <linux/ioport.h> 33 #include <linux/platform_device.h> 34 #include <linux/slab.h> 35 #include <linux/compiler.h> 36 #include <linux/pstore_ram.h> 37 #include <linux/of.h> 38 #include <linux/of_address.h> 39 40 #define RAMOOPS_KERNMSG_HDR "====" 41 #define MIN_MEM_SIZE 4096UL 42 43 static ulong record_size = MIN_MEM_SIZE; 44 module_param(record_size, ulong, 0400); 45 MODULE_PARM_DESC(record_size, 46 "size of each dump done on oops/panic"); 47 48 static ulong ramoops_console_size = MIN_MEM_SIZE; 49 module_param_named(console_size, ramoops_console_size, ulong, 0400); 50 MODULE_PARM_DESC(console_size, "size of kernel console log"); 51 52 static ulong ramoops_ftrace_size = MIN_MEM_SIZE; 53 module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); 54 MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); 55 56 static ulong ramoops_pmsg_size = MIN_MEM_SIZE; 57 module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); 58 MODULE_PARM_DESC(pmsg_size, "size of user space message log"); 59 60 static unsigned long long mem_address; 61 module_param(mem_address, ullong, 0400); 62 MODULE_PARM_DESC(mem_address, 63 "start of reserved RAM used to store oops/panic logs"); 64 65 static ulong mem_size; 66 module_param(mem_size, ulong, 0400); 67 MODULE_PARM_DESC(mem_size, 68 "size of reserved RAM used to store oops/panic logs"); 69 70 static unsigned int mem_type; 71 module_param(mem_type, uint, 0600); 72 MODULE_PARM_DESC(mem_type, 73 "set to 1 to try to use unbuffered memory (default 0)"); 74 75 static int dump_oops = 1; 76 module_param(dump_oops, int, 0600); 77 MODULE_PARM_DESC(dump_oops, 78 "set to 1 to dump oopses, 0 to only dump panics (default 1)"); 79 80 static int ramoops_ecc; 81 module_param_named(ecc, ramoops_ecc, int, 0600); 82 MODULE_PARM_DESC(ramoops_ecc, 83 "if non-zero, the option enables ECC support and specifies " 84 "ECC buffer size in bytes (1 is a special value, means 16 " 85 "bytes ECC)"); 86 87 struct ramoops_context { 88 struct persistent_ram_zone **przs; 89 struct persistent_ram_zone *cprz; 90 struct persistent_ram_zone *fprz; 91 struct persistent_ram_zone *mprz; 92 phys_addr_t phys_addr; 93 unsigned long size; 94 unsigned int memtype; 95 size_t record_size; 96 size_t console_size; 97 size_t ftrace_size; 98 size_t pmsg_size; 99 int dump_oops; 100 struct persistent_ram_ecc_info ecc_info; 101 unsigned int max_dump_cnt; 102 unsigned int dump_write_cnt; 103 /* _read_cnt need clear on ramoops_pstore_open */ 104 unsigned int dump_read_cnt; 105 unsigned int console_read_cnt; 106 unsigned int ftrace_read_cnt; 107 unsigned int pmsg_read_cnt; 108 struct pstore_info pstore; 109 }; 110 111 static struct platform_device *dummy; 112 static struct ramoops_platform_data *dummy_data; 113 114 static int ramoops_pstore_open(struct pstore_info *psi) 115 { 116 struct ramoops_context *cxt = psi->data; 117 118 cxt->dump_read_cnt = 0; 119 cxt->console_read_cnt = 0; 120 cxt->ftrace_read_cnt = 0; 121 cxt->pmsg_read_cnt = 0; 122 return 0; 123 } 124 125 static struct persistent_ram_zone * 126 ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, 127 u64 *id, 128 enum pstore_type_id *typep, enum pstore_type_id type, 129 bool update) 130 { 131 struct persistent_ram_zone *prz; 132 int i = (*c)++; 133 134 if (i >= max) 135 return NULL; 136 137 prz = przs[i]; 138 if (!prz) 139 return NULL; 140 141 /* Update old/shadowed buffer. */ 142 if (update) 143 persistent_ram_save_old(prz); 144 145 if (!persistent_ram_old_size(prz)) 146 return NULL; 147 148 *typep = type; 149 *id = i; 150 151 return prz; 152 } 153 154 static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, 155 bool *compressed) 156 { 157 char data_type; 158 int header_length = 0; 159 160 if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, 161 &time->tv_nsec, &data_type, &header_length) == 3) { 162 if (data_type == 'C') 163 *compressed = true; 164 else 165 *compressed = false; 166 } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", 167 &time->tv_sec, &time->tv_nsec, &header_length) == 2) { 168 *compressed = false; 169 } else { 170 time->tv_sec = 0; 171 time->tv_nsec = 0; 172 *compressed = false; 173 } 174 return header_length; 175 } 176 177 static bool prz_ok(struct persistent_ram_zone *prz) 178 { 179 return !!prz && !!(persistent_ram_old_size(prz) + 180 persistent_ram_ecc_string(prz, NULL, 0)); 181 } 182 183 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, 184 int *count, struct timespec *time, 185 char **buf, bool *compressed, 186 ssize_t *ecc_notice_size, 187 struct pstore_info *psi) 188 { 189 ssize_t size; 190 struct ramoops_context *cxt = psi->data; 191 struct persistent_ram_zone *prz = NULL; 192 int header_length = 0; 193 194 /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but 195 * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have 196 * valid time stamps, so it is initialized to zero. 197 */ 198 time->tv_sec = 0; 199 time->tv_nsec = 0; 200 *compressed = false; 201 202 /* Find the next valid persistent_ram_zone for DMESG */ 203 while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { 204 prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, 205 cxt->max_dump_cnt, id, type, 206 PSTORE_TYPE_DMESG, 1); 207 if (!prz_ok(prz)) 208 continue; 209 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), 210 time, compressed); 211 /* Clear and skip this DMESG record if it has no valid header */ 212 if (!header_length) { 213 persistent_ram_free_old(prz); 214 persistent_ram_zap(prz); 215 prz = NULL; 216 } 217 } 218 219 if (!prz_ok(prz)) 220 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, 221 1, id, type, PSTORE_TYPE_CONSOLE, 0); 222 if (!prz_ok(prz)) 223 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, 224 1, id, type, PSTORE_TYPE_FTRACE, 0); 225 if (!prz_ok(prz)) 226 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, 227 1, id, type, PSTORE_TYPE_PMSG, 0); 228 if (!prz_ok(prz)) 229 return 0; 230 231 size = persistent_ram_old_size(prz) - header_length; 232 233 /* ECC correction notice */ 234 *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); 235 236 *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL); 237 if (*buf == NULL) 238 return -ENOMEM; 239 240 memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); 241 persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1); 242 243 return size; 244 } 245 246 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, 247 bool compressed) 248 { 249 char *hdr; 250 struct timespec timestamp; 251 size_t len; 252 253 /* Report zeroed timestamp if called before timekeeping has resumed. */ 254 if (__getnstimeofday(×tamp)) { 255 timestamp.tv_sec = 0; 256 timestamp.tv_nsec = 0; 257 } 258 hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", 259 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), 260 compressed ? 'C' : 'D'); 261 WARN_ON_ONCE(!hdr); 262 len = hdr ? strlen(hdr) : 0; 263 persistent_ram_write(prz, hdr, len); 264 kfree(hdr); 265 266 return len; 267 } 268 269 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, 270 enum kmsg_dump_reason reason, 271 u64 *id, unsigned int part, 272 const char *buf, 273 bool compressed, size_t size, 274 struct pstore_info *psi) 275 { 276 struct ramoops_context *cxt = psi->data; 277 struct persistent_ram_zone *prz; 278 size_t hlen; 279 280 if (type == PSTORE_TYPE_CONSOLE) { 281 if (!cxt->cprz) 282 return -ENOMEM; 283 persistent_ram_write(cxt->cprz, buf, size); 284 return 0; 285 } else if (type == PSTORE_TYPE_FTRACE) { 286 if (!cxt->fprz) 287 return -ENOMEM; 288 persistent_ram_write(cxt->fprz, buf, size); 289 return 0; 290 } else if (type == PSTORE_TYPE_PMSG) { 291 if (!cxt->mprz) 292 return -ENOMEM; 293 persistent_ram_write(cxt->mprz, buf, size); 294 return 0; 295 } 296 297 if (type != PSTORE_TYPE_DMESG) 298 return -EINVAL; 299 300 /* Out of the various dmesg dump types, ramoops is currently designed 301 * to only store crash logs, rather than storing general kernel logs. 302 */ 303 if (reason != KMSG_DUMP_OOPS && 304 reason != KMSG_DUMP_PANIC) 305 return -EINVAL; 306 307 /* Skip Oopes when configured to do so. */ 308 if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) 309 return -EINVAL; 310 311 /* Explicitly only take the first part of any new crash. 312 * If our buffer is larger than kmsg_bytes, this can never happen, 313 * and if our buffer is smaller than kmsg_bytes, we don't want the 314 * report split across multiple records. 315 */ 316 if (part != 1) 317 return -ENOSPC; 318 319 if (!cxt->przs) 320 return -ENOSPC; 321 322 prz = cxt->przs[cxt->dump_write_cnt]; 323 324 hlen = ramoops_write_kmsg_hdr(prz, compressed); 325 if (size + hlen > prz->buffer_size) 326 size = prz->buffer_size - hlen; 327 persistent_ram_write(prz, buf, size); 328 329 cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; 330 331 return 0; 332 } 333 334 static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type, 335 enum kmsg_dump_reason reason, 336 u64 *id, unsigned int part, 337 const char __user *buf, 338 bool compressed, size_t size, 339 struct pstore_info *psi) 340 { 341 if (type == PSTORE_TYPE_PMSG) { 342 struct ramoops_context *cxt = psi->data; 343 344 if (!cxt->mprz) 345 return -ENOMEM; 346 return persistent_ram_write_user(cxt->mprz, buf, size); 347 } 348 349 return -EINVAL; 350 } 351 352 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, 353 struct timespec time, struct pstore_info *psi) 354 { 355 struct ramoops_context *cxt = psi->data; 356 struct persistent_ram_zone *prz; 357 358 switch (type) { 359 case PSTORE_TYPE_DMESG: 360 if (id >= cxt->max_dump_cnt) 361 return -EINVAL; 362 prz = cxt->przs[id]; 363 break; 364 case PSTORE_TYPE_CONSOLE: 365 prz = cxt->cprz; 366 break; 367 case PSTORE_TYPE_FTRACE: 368 prz = cxt->fprz; 369 break; 370 case PSTORE_TYPE_PMSG: 371 prz = cxt->mprz; 372 break; 373 default: 374 return -EINVAL; 375 } 376 377 persistent_ram_free_old(prz); 378 persistent_ram_zap(prz); 379 380 return 0; 381 } 382 383 static struct ramoops_context oops_cxt = { 384 .pstore = { 385 .owner = THIS_MODULE, 386 .name = "ramoops", 387 .open = ramoops_pstore_open, 388 .read = ramoops_pstore_read, 389 .write_buf = ramoops_pstore_write_buf, 390 .write_buf_user = ramoops_pstore_write_buf_user, 391 .erase = ramoops_pstore_erase, 392 }, 393 }; 394 395 static void ramoops_free_przs(struct ramoops_context *cxt) 396 { 397 int i; 398 399 if (!cxt->przs) 400 return; 401 402 for (i = 0; i < cxt->max_dump_cnt; i++) 403 persistent_ram_free(cxt->przs[i]); 404 405 kfree(cxt->przs); 406 cxt->max_dump_cnt = 0; 407 } 408 409 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, 410 phys_addr_t *paddr, size_t dump_mem_sz) 411 { 412 int err = -ENOMEM; 413 int i; 414 415 if (!cxt->record_size) 416 return 0; 417 418 if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { 419 dev_err(dev, "no room for dumps\n"); 420 return -ENOMEM; 421 } 422 423 cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; 424 if (!cxt->max_dump_cnt) 425 return -ENOMEM; 426 427 cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, 428 GFP_KERNEL); 429 if (!cxt->przs) { 430 dev_err(dev, "failed to initialize a prz array for dumps\n"); 431 goto fail_mem; 432 } 433 434 for (i = 0; i < cxt->max_dump_cnt; i++) { 435 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0, 436 &cxt->ecc_info, 437 cxt->memtype); 438 if (IS_ERR(cxt->przs[i])) { 439 err = PTR_ERR(cxt->przs[i]); 440 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", 441 cxt->record_size, (unsigned long long)*paddr, err); 442 443 while (i > 0) { 444 i--; 445 persistent_ram_free(cxt->przs[i]); 446 } 447 goto fail_prz; 448 } 449 *paddr += cxt->record_size; 450 } 451 452 return 0; 453 fail_prz: 454 kfree(cxt->przs); 455 fail_mem: 456 cxt->max_dump_cnt = 0; 457 return err; 458 } 459 460 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, 461 struct persistent_ram_zone **prz, 462 phys_addr_t *paddr, size_t sz, u32 sig) 463 { 464 if (!sz) 465 return 0; 466 467 if (*paddr + sz - cxt->phys_addr > cxt->size) { 468 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", 469 sz, (unsigned long long)*paddr, 470 cxt->size, (unsigned long long)cxt->phys_addr); 471 return -ENOMEM; 472 } 473 474 *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype); 475 if (IS_ERR(*prz)) { 476 int err = PTR_ERR(*prz); 477 478 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", 479 sz, (unsigned long long)*paddr, err); 480 return err; 481 } 482 483 persistent_ram_zap(*prz); 484 485 *paddr += sz; 486 487 return 0; 488 } 489 490 static int ramoops_parse_dt_size(struct platform_device *pdev, 491 const char *propname, u32 *value) 492 { 493 u32 val32 = 0; 494 int ret; 495 496 ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); 497 if (ret < 0 && ret != -EINVAL) { 498 dev_err(&pdev->dev, "failed to parse property %s: %d\n", 499 propname, ret); 500 return ret; 501 } 502 503 if (val32 > INT_MAX) { 504 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); 505 return -EOVERFLOW; 506 } 507 508 *value = val32; 509 return 0; 510 } 511 512 static int ramoops_parse_dt(struct platform_device *pdev, 513 struct ramoops_platform_data *pdata) 514 { 515 struct device_node *of_node = pdev->dev.of_node; 516 struct resource *res; 517 u32 value; 518 int ret; 519 520 dev_dbg(&pdev->dev, "using Device Tree\n"); 521 522 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 523 if (!res) { 524 dev_err(&pdev->dev, 525 "failed to locate DT /reserved-memory resource\n"); 526 return -EINVAL; 527 } 528 529 pdata->mem_size = resource_size(res); 530 pdata->mem_address = res->start; 531 pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); 532 pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); 533 534 #define parse_size(name, field) { \ 535 ret = ramoops_parse_dt_size(pdev, name, &value); \ 536 if (ret < 0) \ 537 return ret; \ 538 field = value; \ 539 } 540 541 parse_size("record-size", pdata->record_size); 542 parse_size("console-size", pdata->console_size); 543 parse_size("ftrace-size", pdata->ftrace_size); 544 parse_size("pmsg-size", pdata->pmsg_size); 545 parse_size("ecc-size", pdata->ecc_info.ecc_size); 546 547 #undef parse_size 548 549 return 0; 550 } 551 552 static int ramoops_probe(struct platform_device *pdev) 553 { 554 struct device *dev = &pdev->dev; 555 struct ramoops_platform_data *pdata = dev->platform_data; 556 struct ramoops_context *cxt = &oops_cxt; 557 size_t dump_mem_sz; 558 phys_addr_t paddr; 559 int err = -EINVAL; 560 561 if (dev_of_node(dev) && !pdata) { 562 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 563 if (!pdata) { 564 err = -ENOMEM; 565 goto fail_out; 566 } 567 568 err = ramoops_parse_dt(pdev, pdata); 569 if (err < 0) 570 goto fail_out; 571 } 572 573 /* Only a single ramoops area allowed at a time, so fail extra 574 * probes. 575 */ 576 if (cxt->max_dump_cnt) 577 goto fail_out; 578 579 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && 580 !pdata->ftrace_size && !pdata->pmsg_size)) { 581 pr_err("The memory size and the record/console size must be " 582 "non-zero\n"); 583 goto fail_out; 584 } 585 586 if (pdata->record_size && !is_power_of_2(pdata->record_size)) 587 pdata->record_size = rounddown_pow_of_two(pdata->record_size); 588 if (pdata->console_size && !is_power_of_2(pdata->console_size)) 589 pdata->console_size = rounddown_pow_of_two(pdata->console_size); 590 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) 591 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); 592 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) 593 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); 594 595 cxt->size = pdata->mem_size; 596 cxt->phys_addr = pdata->mem_address; 597 cxt->memtype = pdata->mem_type; 598 cxt->record_size = pdata->record_size; 599 cxt->console_size = pdata->console_size; 600 cxt->ftrace_size = pdata->ftrace_size; 601 cxt->pmsg_size = pdata->pmsg_size; 602 cxt->dump_oops = pdata->dump_oops; 603 cxt->ecc_info = pdata->ecc_info; 604 605 paddr = cxt->phys_addr; 606 607 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size 608 - cxt->pmsg_size; 609 err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); 610 if (err) 611 goto fail_out; 612 613 err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, 614 cxt->console_size, 0); 615 if (err) 616 goto fail_init_cprz; 617 618 err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, 619 LINUX_VERSION_CODE); 620 if (err) 621 goto fail_init_fprz; 622 623 err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0); 624 if (err) 625 goto fail_init_mprz; 626 627 cxt->pstore.data = cxt; 628 /* 629 * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we 630 * have to handle dumps, we must have at least record_size buffer. And 631 * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be 632 * ZERO_SIZE_PTR). 633 */ 634 if (cxt->console_size) 635 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ 636 cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); 637 cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); 638 if (!cxt->pstore.buf) { 639 pr_err("cannot allocate pstore buffer\n"); 640 err = -ENOMEM; 641 goto fail_clear; 642 } 643 spin_lock_init(&cxt->pstore.buf_lock); 644 645 cxt->pstore.flags = PSTORE_FLAGS_DMESG; 646 if (cxt->console_size) 647 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; 648 if (cxt->ftrace_size) 649 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; 650 if (cxt->pmsg_size) 651 cxt->pstore.flags |= PSTORE_FLAGS_PMSG; 652 653 err = pstore_register(&cxt->pstore); 654 if (err) { 655 pr_err("registering with pstore failed\n"); 656 goto fail_buf; 657 } 658 659 /* 660 * Update the module parameter variables as well so they are visible 661 * through /sys/module/ramoops/parameters/ 662 */ 663 mem_size = pdata->mem_size; 664 mem_address = pdata->mem_address; 665 record_size = pdata->record_size; 666 dump_oops = pdata->dump_oops; 667 ramoops_console_size = pdata->console_size; 668 ramoops_pmsg_size = pdata->pmsg_size; 669 ramoops_ftrace_size = pdata->ftrace_size; 670 671 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", 672 cxt->size, (unsigned long long)cxt->phys_addr, 673 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); 674 675 return 0; 676 677 fail_buf: 678 kfree(cxt->pstore.buf); 679 fail_clear: 680 cxt->pstore.bufsize = 0; 681 persistent_ram_free(cxt->mprz); 682 fail_init_mprz: 683 persistent_ram_free(cxt->fprz); 684 fail_init_fprz: 685 persistent_ram_free(cxt->cprz); 686 fail_init_cprz: 687 ramoops_free_przs(cxt); 688 fail_out: 689 return err; 690 } 691 692 static int ramoops_remove(struct platform_device *pdev) 693 { 694 struct ramoops_context *cxt = &oops_cxt; 695 696 pstore_unregister(&cxt->pstore); 697 698 kfree(cxt->pstore.buf); 699 cxt->pstore.bufsize = 0; 700 701 persistent_ram_free(cxt->mprz); 702 persistent_ram_free(cxt->fprz); 703 persistent_ram_free(cxt->cprz); 704 ramoops_free_przs(cxt); 705 706 return 0; 707 } 708 709 static const struct of_device_id dt_match[] = { 710 { .compatible = "ramoops" }, 711 {} 712 }; 713 714 static struct platform_driver ramoops_driver = { 715 .probe = ramoops_probe, 716 .remove = ramoops_remove, 717 .driver = { 718 .name = "ramoops", 719 .of_match_table = dt_match, 720 }, 721 }; 722 723 static void ramoops_register_dummy(void) 724 { 725 if (!mem_size) 726 return; 727 728 pr_info("using module parameters\n"); 729 730 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); 731 if (!dummy_data) { 732 pr_info("could not allocate pdata\n"); 733 return; 734 } 735 736 dummy_data->mem_size = mem_size; 737 dummy_data->mem_address = mem_address; 738 dummy_data->mem_type = mem_type; 739 dummy_data->record_size = record_size; 740 dummy_data->console_size = ramoops_console_size; 741 dummy_data->ftrace_size = ramoops_ftrace_size; 742 dummy_data->pmsg_size = ramoops_pmsg_size; 743 dummy_data->dump_oops = dump_oops; 744 /* 745 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC 746 * (using 1 byte for ECC isn't much of use anyway). 747 */ 748 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; 749 750 dummy = platform_device_register_data(NULL, "ramoops", -1, 751 dummy_data, sizeof(struct ramoops_platform_data)); 752 if (IS_ERR(dummy)) { 753 pr_info("could not create platform device: %ld\n", 754 PTR_ERR(dummy)); 755 } 756 } 757 758 static int __init ramoops_init(void) 759 { 760 ramoops_register_dummy(); 761 return platform_driver_register(&ramoops_driver); 762 } 763 postcore_initcall(ramoops_init); 764 765 static void __exit ramoops_exit(void) 766 { 767 platform_driver_unregister(&ramoops_driver); 768 platform_device_unregister(dummy); 769 kfree(dummy_data); 770 } 771 module_exit(ramoops_exit); 772 773 MODULE_LICENSE("GPL"); 774 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); 775 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); 776