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 ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, 335 struct timespec time, struct pstore_info *psi) 336 { 337 struct ramoops_context *cxt = psi->data; 338 struct persistent_ram_zone *prz; 339 340 switch (type) { 341 case PSTORE_TYPE_DMESG: 342 if (id >= cxt->max_dump_cnt) 343 return -EINVAL; 344 prz = cxt->przs[id]; 345 break; 346 case PSTORE_TYPE_CONSOLE: 347 prz = cxt->cprz; 348 break; 349 case PSTORE_TYPE_FTRACE: 350 prz = cxt->fprz; 351 break; 352 case PSTORE_TYPE_PMSG: 353 prz = cxt->mprz; 354 break; 355 default: 356 return -EINVAL; 357 } 358 359 persistent_ram_free_old(prz); 360 persistent_ram_zap(prz); 361 362 return 0; 363 } 364 365 static struct ramoops_context oops_cxt = { 366 .pstore = { 367 .owner = THIS_MODULE, 368 .name = "ramoops", 369 .open = ramoops_pstore_open, 370 .read = ramoops_pstore_read, 371 .write_buf = ramoops_pstore_write_buf, 372 .erase = ramoops_pstore_erase, 373 }, 374 }; 375 376 static void ramoops_free_przs(struct ramoops_context *cxt) 377 { 378 int i; 379 380 cxt->max_dump_cnt = 0; 381 if (!cxt->przs) 382 return; 383 384 for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) 385 persistent_ram_free(cxt->przs[i]); 386 kfree(cxt->przs); 387 } 388 389 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, 390 phys_addr_t *paddr, size_t dump_mem_sz) 391 { 392 int err = -ENOMEM; 393 int i; 394 395 if (!cxt->record_size) 396 return 0; 397 398 if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { 399 dev_err(dev, "no room for dumps\n"); 400 return -ENOMEM; 401 } 402 403 cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; 404 if (!cxt->max_dump_cnt) 405 return -ENOMEM; 406 407 cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, 408 GFP_KERNEL); 409 if (!cxt->przs) { 410 dev_err(dev, "failed to initialize a prz array for dumps\n"); 411 goto fail_prz; 412 } 413 414 for (i = 0; i < cxt->max_dump_cnt; i++) { 415 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0, 416 &cxt->ecc_info, 417 cxt->memtype); 418 if (IS_ERR(cxt->przs[i])) { 419 err = PTR_ERR(cxt->przs[i]); 420 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", 421 cxt->record_size, (unsigned long long)*paddr, err); 422 goto fail_prz; 423 } 424 *paddr += cxt->record_size; 425 } 426 427 return 0; 428 fail_prz: 429 ramoops_free_przs(cxt); 430 return err; 431 } 432 433 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, 434 struct persistent_ram_zone **prz, 435 phys_addr_t *paddr, size_t sz, u32 sig) 436 { 437 if (!sz) 438 return 0; 439 440 if (*paddr + sz - cxt->phys_addr > cxt->size) { 441 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", 442 sz, (unsigned long long)*paddr, 443 cxt->size, (unsigned long long)cxt->phys_addr); 444 return -ENOMEM; 445 } 446 447 *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype); 448 if (IS_ERR(*prz)) { 449 int err = PTR_ERR(*prz); 450 451 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", 452 sz, (unsigned long long)*paddr, err); 453 return err; 454 } 455 456 persistent_ram_zap(*prz); 457 458 *paddr += sz; 459 460 return 0; 461 } 462 463 static int ramoops_parse_dt_size(struct platform_device *pdev, 464 const char *propname, u32 *value) 465 { 466 u32 val32 = 0; 467 int ret; 468 469 ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); 470 if (ret < 0 && ret != -EINVAL) { 471 dev_err(&pdev->dev, "failed to parse property %s: %d\n", 472 propname, ret); 473 return ret; 474 } 475 476 if (val32 > INT_MAX) { 477 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); 478 return -EOVERFLOW; 479 } 480 481 *value = val32; 482 return 0; 483 } 484 485 static int ramoops_parse_dt(struct platform_device *pdev, 486 struct ramoops_platform_data *pdata) 487 { 488 struct device_node *of_node = pdev->dev.of_node; 489 struct resource *res; 490 u32 value; 491 int ret; 492 493 dev_dbg(&pdev->dev, "using Device Tree\n"); 494 495 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 496 if (!res) { 497 dev_err(&pdev->dev, 498 "failed to locate DT /reserved-memory resource\n"); 499 return -EINVAL; 500 } 501 502 pdata->mem_size = resource_size(res); 503 pdata->mem_address = res->start; 504 pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); 505 pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); 506 507 #define parse_size(name, field) { \ 508 ret = ramoops_parse_dt_size(pdev, name, &value); \ 509 if (ret < 0) \ 510 return ret; \ 511 field = value; \ 512 } 513 514 parse_size("record-size", pdata->record_size); 515 parse_size("console-size", pdata->console_size); 516 parse_size("ftrace-size", pdata->ftrace_size); 517 parse_size("pmsg-size", pdata->pmsg_size); 518 parse_size("ecc-size", pdata->ecc_info.ecc_size); 519 520 #undef parse_size 521 522 return 0; 523 } 524 525 static int ramoops_probe(struct platform_device *pdev) 526 { 527 struct device *dev = &pdev->dev; 528 struct ramoops_platform_data *pdata = dev->platform_data; 529 struct ramoops_context *cxt = &oops_cxt; 530 size_t dump_mem_sz; 531 phys_addr_t paddr; 532 int err = -EINVAL; 533 534 if (dev_of_node(dev) && !pdata) { 535 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 536 if (!pdata) { 537 err = -ENOMEM; 538 goto fail_out; 539 } 540 541 err = ramoops_parse_dt(pdev, pdata); 542 if (err < 0) 543 goto fail_out; 544 } 545 546 /* Only a single ramoops area allowed at a time, so fail extra 547 * probes. 548 */ 549 if (cxt->max_dump_cnt) 550 goto fail_out; 551 552 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && 553 !pdata->ftrace_size && !pdata->pmsg_size)) { 554 pr_err("The memory size and the record/console size must be " 555 "non-zero\n"); 556 goto fail_out; 557 } 558 559 if (pdata->record_size && !is_power_of_2(pdata->record_size)) 560 pdata->record_size = rounddown_pow_of_two(pdata->record_size); 561 if (pdata->console_size && !is_power_of_2(pdata->console_size)) 562 pdata->console_size = rounddown_pow_of_two(pdata->console_size); 563 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) 564 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); 565 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) 566 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); 567 568 cxt->size = pdata->mem_size; 569 cxt->phys_addr = pdata->mem_address; 570 cxt->memtype = pdata->mem_type; 571 cxt->record_size = pdata->record_size; 572 cxt->console_size = pdata->console_size; 573 cxt->ftrace_size = pdata->ftrace_size; 574 cxt->pmsg_size = pdata->pmsg_size; 575 cxt->dump_oops = pdata->dump_oops; 576 cxt->ecc_info = pdata->ecc_info; 577 578 paddr = cxt->phys_addr; 579 580 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size 581 - cxt->pmsg_size; 582 err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); 583 if (err) 584 goto fail_out; 585 586 err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, 587 cxt->console_size, 0); 588 if (err) 589 goto fail_init_cprz; 590 591 err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, 592 LINUX_VERSION_CODE); 593 if (err) 594 goto fail_init_fprz; 595 596 err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0); 597 if (err) 598 goto fail_init_mprz; 599 600 cxt->pstore.data = cxt; 601 /* 602 * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we 603 * have to handle dumps, we must have at least record_size buffer. And 604 * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be 605 * ZERO_SIZE_PTR). 606 */ 607 if (cxt->console_size) 608 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ 609 cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); 610 cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); 611 spin_lock_init(&cxt->pstore.buf_lock); 612 if (!cxt->pstore.buf) { 613 pr_err("cannot allocate pstore buffer\n"); 614 err = -ENOMEM; 615 goto fail_clear; 616 } 617 618 err = pstore_register(&cxt->pstore); 619 if (err) { 620 pr_err("registering with pstore failed\n"); 621 goto fail_buf; 622 } 623 624 /* 625 * Update the module parameter variables as well so they are visible 626 * through /sys/module/ramoops/parameters/ 627 */ 628 mem_size = pdata->mem_size; 629 mem_address = pdata->mem_address; 630 record_size = pdata->record_size; 631 dump_oops = pdata->dump_oops; 632 ramoops_console_size = pdata->console_size; 633 ramoops_pmsg_size = pdata->pmsg_size; 634 ramoops_ftrace_size = pdata->ftrace_size; 635 636 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", 637 cxt->size, (unsigned long long)cxt->phys_addr, 638 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); 639 640 return 0; 641 642 fail_buf: 643 kfree(cxt->pstore.buf); 644 fail_clear: 645 cxt->pstore.bufsize = 0; 646 persistent_ram_free(cxt->mprz); 647 fail_init_mprz: 648 persistent_ram_free(cxt->fprz); 649 fail_init_fprz: 650 persistent_ram_free(cxt->cprz); 651 fail_init_cprz: 652 ramoops_free_przs(cxt); 653 fail_out: 654 return err; 655 } 656 657 static int ramoops_remove(struct platform_device *pdev) 658 { 659 struct ramoops_context *cxt = &oops_cxt; 660 661 pstore_unregister(&cxt->pstore); 662 cxt->max_dump_cnt = 0; 663 664 kfree(cxt->pstore.buf); 665 cxt->pstore.bufsize = 0; 666 667 persistent_ram_free(cxt->mprz); 668 persistent_ram_free(cxt->fprz); 669 persistent_ram_free(cxt->cprz); 670 ramoops_free_przs(cxt); 671 672 return 0; 673 } 674 675 static const struct of_device_id dt_match[] = { 676 { .compatible = "ramoops" }, 677 {} 678 }; 679 680 static struct platform_driver ramoops_driver = { 681 .probe = ramoops_probe, 682 .remove = ramoops_remove, 683 .driver = { 684 .name = "ramoops", 685 .of_match_table = dt_match, 686 }, 687 }; 688 689 static void ramoops_register_dummy(void) 690 { 691 if (!mem_size) 692 return; 693 694 pr_info("using module parameters\n"); 695 696 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); 697 if (!dummy_data) { 698 pr_info("could not allocate pdata\n"); 699 return; 700 } 701 702 dummy_data->mem_size = mem_size; 703 dummy_data->mem_address = mem_address; 704 dummy_data->mem_type = mem_type; 705 dummy_data->record_size = record_size; 706 dummy_data->console_size = ramoops_console_size; 707 dummy_data->ftrace_size = ramoops_ftrace_size; 708 dummy_data->pmsg_size = ramoops_pmsg_size; 709 dummy_data->dump_oops = dump_oops; 710 /* 711 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC 712 * (using 1 byte for ECC isn't much of use anyway). 713 */ 714 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; 715 716 dummy = platform_device_register_data(NULL, "ramoops", -1, 717 dummy_data, sizeof(struct ramoops_platform_data)); 718 if (IS_ERR(dummy)) { 719 pr_info("could not create platform device: %ld\n", 720 PTR_ERR(dummy)); 721 } 722 } 723 724 static int __init ramoops_init(void) 725 { 726 ramoops_register_dummy(); 727 return platform_driver_register(&ramoops_driver); 728 } 729 postcore_initcall(ramoops_init); 730 731 static void __exit ramoops_exit(void) 732 { 733 platform_driver_unregister(&ramoops_driver); 734 platform_device_unregister(dummy); 735 kfree(dummy_data); 736 } 737 module_exit(ramoops_exit); 738 739 MODULE_LICENSE("GPL"); 740 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); 741 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); 742