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1// SPDX-License-Identifier: GPL-2.0-only2#include <linux/types.h>3#include <linux/string.h>4#include <linux/init.h>5#include <linux/module.h>6#include <linux/ctype.h>7#include <linux/dmi.h>8#include <linux/efi.h>9#include <linux/memblock.h>10#include <linux/random.h>11#include <asm/dmi.h>12#include <linux/unaligned.h>13 14#ifndef SMBIOS_ENTRY_POINT_SCAN_START15#define SMBIOS_ENTRY_POINT_SCAN_START 0xF000016#endif17 18struct kobject *dmi_kobj;19EXPORT_SYMBOL_GPL(dmi_kobj);20 21/*22 * DMI stands for "Desktop Management Interface". It is part23 * of and an antecedent to, SMBIOS, which stands for System24 * Management BIOS. See further: https://www.dmtf.org/standards25 */26static const char dmi_empty_string[] = "";27 28static u32 dmi_ver __initdata;29static u32 dmi_len;30static u16 dmi_num;31static u8 smbios_entry_point[32];32static int smbios_entry_point_size;33 34/* DMI system identification string used during boot */35static char dmi_ids_string[128] __initdata;36 37static struct dmi_memdev_info {38 const char *device;39 const char *bank;40 u64 size; /* bytes */41 u16 handle;42 u8 type; /* DDR2, DDR3, DDR4 etc */43} *dmi_memdev;44static int dmi_memdev_nr;45static int dmi_memdev_populated_nr __initdata;46 47static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)48{49 const u8 *bp = ((u8 *) dm) + dm->length;50 const u8 *nsp;51 52 if (s) {53 while (--s > 0 && *bp)54 bp += strlen(bp) + 1;55 56 /* Strings containing only spaces are considered empty */57 nsp = bp;58 while (*nsp == ' ')59 nsp++;60 if (*nsp != '\0')61 return bp;62 }63 64 return dmi_empty_string;65}66 67static const char * __init dmi_string(const struct dmi_header *dm, u8 s)68{69 const char *bp = dmi_string_nosave(dm, s);70 char *str;71 size_t len;72 73 if (bp == dmi_empty_string)74 return dmi_empty_string;75 76 len = strlen(bp) + 1;77 str = dmi_alloc(len);78 if (str != NULL)79 strcpy(str, bp);80 81 return str;82}83 84/*85 * We have to be cautious here. We have seen BIOSes with DMI pointers86 * pointing to completely the wrong place for example87 */88static void dmi_decode_table(u8 *buf,89 void (*decode)(const struct dmi_header *, void *),90 void *private_data)91{92 u8 *data = buf;93 int i = 0;94 95 /*96 * Stop when we have seen all the items the table claimed to have97 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS98 * >= 3.0 only) OR we run off the end of the table (should never99 * happen but sometimes does on bogus implementations.)100 */101 while ((!dmi_num || i < dmi_num) &&102 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {103 const struct dmi_header *dm = (const struct dmi_header *)data;104 105 /*106 * If a short entry is found (less than 4 bytes), not only it107 * is invalid, but we cannot reliably locate the next entry.108 */109 if (dm->length < sizeof(struct dmi_header)) {110 pr_warn(FW_BUG111 "Corrupted DMI table, offset %zd (only %d entries processed)\n",112 data - buf, i);113 break;114 }115 116 /*117 * We want to know the total length (formatted area and118 * strings) before decoding to make sure we won't run off the119 * table in dmi_decode or dmi_string120 */121 data += dm->length;122 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))123 data++;124 if (data - buf < dmi_len - 1)125 decode(dm, private_data);126 127 data += 2;128 i++;129 130 /*131 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]132 * For tables behind a 64-bit entry point, we have no item133 * count and no exact table length, so stop on end-of-table134 * marker. For tables behind a 32-bit entry point, we have135 * seen OEM structures behind the end-of-table marker on136 * some systems, so don't trust it.137 */138 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)139 break;140 }141 142 /* Trim DMI table length if needed */143 if (dmi_len > data - buf)144 dmi_len = data - buf;145}146 147static phys_addr_t dmi_base;148 149static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,150 void *))151{152 u8 *buf;153 u32 orig_dmi_len = dmi_len;154 155 buf = dmi_early_remap(dmi_base, orig_dmi_len);156 if (buf == NULL)157 return -ENOMEM;158 159 dmi_decode_table(buf, decode, NULL);160 161 add_device_randomness(buf, dmi_len);162 163 dmi_early_unmap(buf, orig_dmi_len);164 return 0;165}166 167static int __init dmi_checksum(const u8 *buf, u8 len)168{169 u8 sum = 0;170 int a;171 172 for (a = 0; a < len; a++)173 sum += buf[a];174 175 return sum == 0;176}177 178static const char *dmi_ident[DMI_STRING_MAX];179static LIST_HEAD(dmi_devices);180int dmi_available;181EXPORT_SYMBOL_GPL(dmi_available);182 183/*184 * Save a DMI string185 */186static void __init dmi_save_ident(const struct dmi_header *dm, int slot,187 int string)188{189 const char *d = (const char *) dm;190 const char *p;191 192 if (dmi_ident[slot] || dm->length <= string)193 return;194 195 p = dmi_string(dm, d[string]);196 if (p == NULL)197 return;198 199 dmi_ident[slot] = p;200}201 202static void __init dmi_save_release(const struct dmi_header *dm, int slot,203 int index)204{205 const u8 *minor, *major;206 char *s;207 208 /* If the table doesn't have the field, let's return */209 if (dmi_ident[slot] || dm->length < index)210 return;211 212 minor = (u8 *) dm + index;213 major = (u8 *) dm + index - 1;214 215 /* As per the spec, if the system doesn't support this field,216 * the value is FF217 */218 if (*major == 0xFF && *minor == 0xFF)219 return;220 221 s = dmi_alloc(8);222 if (!s)223 return;224 225 sprintf(s, "%u.%u", *major, *minor);226 227 dmi_ident[slot] = s;228}229 230static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,231 int index)232{233 const u8 *d;234 char *s;235 int is_ff = 1, is_00 = 1, i;236 237 if (dmi_ident[slot] || dm->length < index + 16)238 return;239 240 d = (u8 *) dm + index;241 for (i = 0; i < 16 && (is_ff || is_00); i++) {242 if (d[i] != 0x00)243 is_00 = 0;244 if (d[i] != 0xFF)245 is_ff = 0;246 }247 248 if (is_ff || is_00)249 return;250 251 s = dmi_alloc(16*2+4+1);252 if (!s)253 return;254 255 /*256 * As of version 2.6 of the SMBIOS specification, the first 3 fields of257 * the UUID are supposed to be little-endian encoded. The specification258 * says that this is the defacto standard.259 */260 if (dmi_ver >= 0x020600)261 sprintf(s, "%pUl", d);262 else263 sprintf(s, "%pUb", d);264 265 dmi_ident[slot] = s;266}267 268static void __init dmi_save_type(const struct dmi_header *dm, int slot,269 int index)270{271 const u8 *d;272 char *s;273 274 if (dmi_ident[slot] || dm->length <= index)275 return;276 277 s = dmi_alloc(4);278 if (!s)279 return;280 281 d = (u8 *) dm + index;282 sprintf(s, "%u", *d & 0x7F);283 dmi_ident[slot] = s;284}285 286static void __init dmi_save_one_device(int type, const char *name)287{288 struct dmi_device *dev;289 290 /* No duplicate device */291 if (dmi_find_device(type, name, NULL))292 return;293 294 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);295 if (!dev)296 return;297 298 dev->type = type;299 strcpy((char *)(dev + 1), name);300 dev->name = (char *)(dev + 1);301 dev->device_data = NULL;302 list_add(&dev->list, &dmi_devices);303}304 305static void __init dmi_save_devices(const struct dmi_header *dm)306{307 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;308 309 for (i = 0; i < count; i++) {310 const char *d = (char *)(dm + 1) + (i * 2);311 312 /* Skip disabled device */313 if ((*d & 0x80) == 0)314 continue;315 316 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));317 }318}319 320static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)321{322 int i, count;323 struct dmi_device *dev;324 325 if (dm->length < 0x05)326 return;327 328 count = *(u8 *)(dm + 1);329 for (i = 1; i <= count; i++) {330 const char *devname = dmi_string(dm, i);331 332 if (devname == dmi_empty_string)333 continue;334 335 dev = dmi_alloc(sizeof(*dev));336 if (!dev)337 break;338 339 dev->type = DMI_DEV_TYPE_OEM_STRING;340 dev->name = devname;341 dev->device_data = NULL;342 343 list_add(&dev->list, &dmi_devices);344 }345}346 347static void __init dmi_save_ipmi_device(const struct dmi_header *dm)348{349 struct dmi_device *dev;350 void *data;351 352 data = dmi_alloc(dm->length);353 if (data == NULL)354 return;355 356 memcpy(data, dm, dm->length);357 358 dev = dmi_alloc(sizeof(*dev));359 if (!dev)360 return;361 362 dev->type = DMI_DEV_TYPE_IPMI;363 dev->name = "IPMI controller";364 dev->device_data = data;365 366 list_add_tail(&dev->list, &dmi_devices);367}368 369static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,370 int devfn, const char *name, int type)371{372 struct dmi_dev_onboard *dev;373 374 /* Ignore invalid values */375 if (type == DMI_DEV_TYPE_DEV_SLOT &&376 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)377 return;378 379 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);380 if (!dev)381 return;382 383 dev->instance = instance;384 dev->segment = segment;385 dev->bus = bus;386 dev->devfn = devfn;387 388 strcpy((char *)&dev[1], name);389 dev->dev.type = type;390 dev->dev.name = (char *)&dev[1];391 dev->dev.device_data = dev;392 393 list_add(&dev->dev.list, &dmi_devices);394}395 396static void __init dmi_save_extended_devices(const struct dmi_header *dm)397{398 const char *name;399 const u8 *d = (u8 *)dm;400 401 if (dm->length < 0x0B)402 return;403 404 /* Skip disabled device */405 if ((d[0x5] & 0x80) == 0)406 return;407 408 name = dmi_string_nosave(dm, d[0x4]);409 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,410 DMI_DEV_TYPE_DEV_ONBOARD);411 dmi_save_one_device(d[0x5] & 0x7f, name);412}413 414static void __init dmi_save_system_slot(const struct dmi_header *dm)415{416 const u8 *d = (u8 *)dm;417 418 /* Need SMBIOS 2.6+ structure */419 if (dm->length < 0x11)420 return;421 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],422 d[0x10], dmi_string_nosave(dm, d[0x4]),423 DMI_DEV_TYPE_DEV_SLOT);424}425 426static void __init count_mem_devices(const struct dmi_header *dm, void *v)427{428 if (dm->type != DMI_ENTRY_MEM_DEVICE)429 return;430 dmi_memdev_nr++;431}432 433static void __init save_mem_devices(const struct dmi_header *dm, void *v)434{435 const char *d = (const char *)dm;436 static int nr;437 u64 bytes;438 u16 size;439 440 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13)441 return;442 if (nr >= dmi_memdev_nr) {443 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");444 return;445 }446 dmi_memdev[nr].handle = get_unaligned(&dm->handle);447 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);448 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);449 dmi_memdev[nr].type = d[0x12];450 451 size = get_unaligned((u16 *)&d[0xC]);452 if (size == 0)453 bytes = 0;454 else if (size == 0xffff)455 bytes = ~0ull;456 else if (size & 0x8000)457 bytes = (u64)(size & 0x7fff) << 10;458 else if (size != 0x7fff || dm->length < 0x20)459 bytes = (u64)size << 20;460 else461 bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;462 463 if (bytes)464 dmi_memdev_populated_nr++;465 466 dmi_memdev[nr].size = bytes;467 nr++;468}469 470static void __init dmi_memdev_walk(void)471{472 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {473 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);474 if (dmi_memdev)475 dmi_walk_early(save_mem_devices);476 }477}478 479/*480 * Process a DMI table entry. Right now all we care about are the BIOS481 * and machine entries. For 2.5 we should pull the smbus controller info482 * out of here.483 */484static void __init dmi_decode(const struct dmi_header *dm, void *dummy)485{486 switch (dm->type) {487 case 0: /* BIOS Information */488 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);489 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);490 dmi_save_ident(dm, DMI_BIOS_DATE, 8);491 dmi_save_release(dm, DMI_BIOS_RELEASE, 21);492 dmi_save_release(dm, DMI_EC_FIRMWARE_RELEASE, 23);493 break;494 case 1: /* System Information */495 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);496 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);497 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);498 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);499 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);500 dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);501 dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);502 break;503 case 2: /* Base Board Information */504 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);505 dmi_save_ident(dm, DMI_BOARD_NAME, 5);506 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);507 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);508 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);509 break;510 case 3: /* Chassis Information */511 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);512 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);513 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);514 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);515 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);516 break;517 case 9: /* System Slots */518 dmi_save_system_slot(dm);519 break;520 case 10: /* Onboard Devices Information */521 dmi_save_devices(dm);522 break;523 case 11: /* OEM Strings */524 dmi_save_oem_strings_devices(dm);525 break;526 case 38: /* IPMI Device Information */527 dmi_save_ipmi_device(dm);528 break;529 case 41: /* Onboard Devices Extended Information */530 dmi_save_extended_devices(dm);531 }532}533 534static int __init print_filtered(char *buf, size_t len, const char *info)535{536 int c = 0;537 const char *p;538 539 if (!info)540 return c;541 542 for (p = info; *p; p++)543 if (isprint(*p))544 c += scnprintf(buf + c, len - c, "%c", *p);545 else546 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);547 return c;548}549 550static void __init dmi_format_ids(char *buf, size_t len)551{552 int c = 0;553 const char *board; /* Board Name is optional */554 555 c += print_filtered(buf + c, len - c,556 dmi_get_system_info(DMI_SYS_VENDOR));557 c += scnprintf(buf + c, len - c, " ");558 c += print_filtered(buf + c, len - c,559 dmi_get_system_info(DMI_PRODUCT_NAME));560 561 board = dmi_get_system_info(DMI_BOARD_NAME);562 if (board) {563 c += scnprintf(buf + c, len - c, "/");564 c += print_filtered(buf + c, len - c, board);565 }566 c += scnprintf(buf + c, len - c, ", BIOS ");567 c += print_filtered(buf + c, len - c,568 dmi_get_system_info(DMI_BIOS_VERSION));569 c += scnprintf(buf + c, len - c, " ");570 c += print_filtered(buf + c, len - c,571 dmi_get_system_info(DMI_BIOS_DATE));572}573 574/*575 * Check for DMI/SMBIOS headers in the system firmware image. Any576 * SMBIOS header must start 16 bytes before the DMI header, so take a577 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset578 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS579 * takes precedence) and return 0. Otherwise return 1.580 */581static int __init dmi_present(const u8 *buf)582{583 u32 smbios_ver;584 585 /*586 * The size of this structure is 31 bytes, but we also accept value587 * 30 due to a mistake in SMBIOS specification version 2.1.588 */589 if (memcmp(buf, "_SM_", 4) == 0 &&590 buf[5] >= 30 && buf[5] <= 32 &&591 dmi_checksum(buf, buf[5])) {592 smbios_ver = get_unaligned_be16(buf + 6);593 smbios_entry_point_size = buf[5];594 memcpy(smbios_entry_point, buf, smbios_entry_point_size);595 596 /* Some BIOS report weird SMBIOS version, fix that up */597 switch (smbios_ver) {598 case 0x021F:599 case 0x0221:600 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",601 smbios_ver & 0xFF, 3);602 smbios_ver = 0x0203;603 break;604 case 0x0233:605 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);606 smbios_ver = 0x0206;607 break;608 }609 } else {610 smbios_ver = 0;611 }612 613 buf += 16;614 615 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {616 if (smbios_ver)617 dmi_ver = smbios_ver;618 else619 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);620 dmi_ver <<= 8;621 dmi_num = get_unaligned_le16(buf + 12);622 dmi_len = get_unaligned_le16(buf + 6);623 dmi_base = get_unaligned_le32(buf + 8);624 625 if (dmi_walk_early(dmi_decode) == 0) {626 if (smbios_ver) {627 pr_info("SMBIOS %d.%d present.\n",628 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);629 } else {630 smbios_entry_point_size = 15;631 memcpy(smbios_entry_point, buf,632 smbios_entry_point_size);633 pr_info("Legacy DMI %d.%d present.\n",634 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);635 }636 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));637 pr_info("DMI: %s\n", dmi_ids_string);638 return 0;639 }640 }641 642 return 1;643}644 645/*646 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy647 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.648 */649static int __init dmi_smbios3_present(const u8 *buf)650{651 if (memcmp(buf, "_SM3_", 5) == 0 &&652 buf[6] >= 24 && buf[6] <= 32 &&653 dmi_checksum(buf, buf[6])) {654 dmi_ver = get_unaligned_be24(buf + 7);655 dmi_num = 0; /* No longer specified */656 dmi_len = get_unaligned_le32(buf + 12);657 dmi_base = get_unaligned_le64(buf + 16);658 smbios_entry_point_size = buf[6];659 memcpy(smbios_entry_point, buf, smbios_entry_point_size);660 661 if (dmi_walk_early(dmi_decode) == 0) {662 pr_info("SMBIOS %d.%d.%d present.\n",663 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,664 dmi_ver & 0xFF);665 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));666 pr_info("DMI: %s\n", dmi_ids_string);667 return 0;668 }669 }670 return 1;671}672 673static void __init dmi_scan_machine(void)674{675 char __iomem *p, *q;676 char buf[32];677 678 if (efi_enabled(EFI_CONFIG_TABLES)) {679 /*680 * According to the DMTF SMBIOS reference spec v3.0.0, it is681 * allowed to define both the 64-bit entry point (smbios3) and682 * the 32-bit entry point (smbios), in which case they should683 * either both point to the same SMBIOS structure table, or the684 * table pointed to by the 64-bit entry point should contain a685 * superset of the table contents pointed to by the 32-bit entry686 * point (section 5.2)687 * This implies that the 64-bit entry point should have688 * precedence if it is defined and supported by the OS. If we689 * have the 64-bit entry point, but fail to decode it, fall690 * back to the legacy one (if available)691 */692 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {693 p = dmi_early_remap(efi.smbios3, 32);694 if (p == NULL)695 goto error;696 memcpy_fromio(buf, p, 32);697 dmi_early_unmap(p, 32);698 699 if (!dmi_smbios3_present(buf)) {700 dmi_available = 1;701 return;702 }703 }704 if (efi.smbios == EFI_INVALID_TABLE_ADDR)705 goto error;706 707 /* This is called as a core_initcall() because it isn't708 * needed during early boot. This also means we can709 * iounmap the space when we're done with it.710 */711 p = dmi_early_remap(efi.smbios, 32);712 if (p == NULL)713 goto error;714 memcpy_fromio(buf, p, 32);715 dmi_early_unmap(p, 32);716 717 if (!dmi_present(buf)) {718 dmi_available = 1;719 return;720 }721 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {722 p = dmi_early_remap(SMBIOS_ENTRY_POINT_SCAN_START, 0x10000);723 if (p == NULL)724 goto error;725 726 /*727 * Same logic as above, look for a 64-bit entry point728 * first, and if not found, fall back to 32-bit entry point.729 */730 memcpy_fromio(buf, p, 16);731 for (q = p + 16; q < p + 0x10000; q += 16) {732 memcpy_fromio(buf + 16, q, 16);733 if (!dmi_smbios3_present(buf)) {734 dmi_available = 1;735 dmi_early_unmap(p, 0x10000);736 return;737 }738 memcpy(buf, buf + 16, 16);739 }740 741 /*742 * Iterate over all possible DMI header addresses q.743 * Maintain the 32 bytes around q in buf. On the744 * first iteration, substitute zero for the745 * out-of-range bytes so there is no chance of falsely746 * detecting an SMBIOS header.747 */748 memset(buf, 0, 16);749 for (q = p; q < p + 0x10000; q += 16) {750 memcpy_fromio(buf + 16, q, 16);751 if (!dmi_present(buf)) {752 dmi_available = 1;753 dmi_early_unmap(p, 0x10000);754 return;755 }756 memcpy(buf, buf + 16, 16);757 }758 dmi_early_unmap(p, 0x10000);759 }760 error:761 pr_info("DMI not present or invalid.\n");762}763 764static BIN_ATTR_SIMPLE_ADMIN_RO(smbios_entry_point);765static BIN_ATTR_SIMPLE_ADMIN_RO(DMI);766 767static int __init dmi_init(void)768{769 struct kobject *tables_kobj;770 u8 *dmi_table;771 int ret = -ENOMEM;772 773 if (!dmi_available)774 return 0;775 776 /*777 * Set up dmi directory at /sys/firmware/dmi. This entry should stay778 * even after farther error, as it can be used by other modules like779 * dmi-sysfs.780 */781 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);782 if (!dmi_kobj)783 goto err;784 785 tables_kobj = kobject_create_and_add("tables", dmi_kobj);786 if (!tables_kobj)787 goto err;788 789 dmi_table = dmi_remap(dmi_base, dmi_len);790 if (!dmi_table)791 goto err_tables;792 793 bin_attr_smbios_entry_point.size = smbios_entry_point_size;794 bin_attr_smbios_entry_point.private = smbios_entry_point;795 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);796 if (ret)797 goto err_unmap;798 799 bin_attr_DMI.size = dmi_len;800 bin_attr_DMI.private = dmi_table;801 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);802 if (!ret)803 return 0;804 805 sysfs_remove_bin_file(tables_kobj,806 &bin_attr_smbios_entry_point);807 err_unmap:808 dmi_unmap(dmi_table);809 err_tables:810 kobject_del(tables_kobj);811 kobject_put(tables_kobj);812 err:813 pr_err("dmi: Firmware registration failed.\n");814 815 return ret;816}817subsys_initcall(dmi_init);818 819/**820 * dmi_setup - scan and setup DMI system information821 *822 * Scan the DMI system information. This setups DMI identifiers823 * (dmi_system_id) for printing it out on task dumps and prepares824 * DIMM entry information (dmi_memdev_info) from the SMBIOS table825 * for using this when reporting memory errors.826 */827void __init dmi_setup(void)828{829 dmi_scan_machine();830 if (!dmi_available)831 return;832 833 dmi_memdev_walk();834 pr_info("DMI: Memory slots populated: %d/%d\n",835 dmi_memdev_populated_nr, dmi_memdev_nr);836 dump_stack_set_arch_desc("%s", dmi_ids_string);837}838 839/**840 * dmi_matches - check if dmi_system_id structure matches system DMI data841 * @dmi: pointer to the dmi_system_id structure to check842 */843static bool dmi_matches(const struct dmi_system_id *dmi)844{845 int i;846 847 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {848 int s = dmi->matches[i].slot;849 if (s == DMI_NONE)850 break;851 if (s == DMI_OEM_STRING) {852 /* DMI_OEM_STRING must be exact match */853 const struct dmi_device *valid;854 855 valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,856 dmi->matches[i].substr, NULL);857 if (valid)858 continue;859 } else if (dmi_ident[s]) {860 if (dmi->matches[i].exact_match) {861 if (!strcmp(dmi_ident[s],862 dmi->matches[i].substr))863 continue;864 } else {865 if (strstr(dmi_ident[s],866 dmi->matches[i].substr))867 continue;868 }869 }870 871 /* No match */872 return false;873 }874 return true;875}876 877/**878 * dmi_is_end_of_table - check for end-of-table marker879 * @dmi: pointer to the dmi_system_id structure to check880 */881static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)882{883 return dmi->matches[0].slot == DMI_NONE;884}885 886/**887 * dmi_check_system - check system DMI data888 * @list: array of dmi_system_id structures to match against889 * All non-null elements of the list must match890 * their slot's (field index's) data (i.e., each891 * list string must be a substring of the specified892 * DMI slot's string data) to be considered a893 * successful match.894 *895 * Walk the blacklist table running matching functions until someone896 * returns non zero or we hit the end. Callback function is called for897 * each successful match. Returns the number of matches.898 *899 * dmi_setup must be called before this function is called.900 */901int dmi_check_system(const struct dmi_system_id *list)902{903 int count = 0;904 const struct dmi_system_id *d;905 906 for (d = list; !dmi_is_end_of_table(d); d++)907 if (dmi_matches(d)) {908 count++;909 if (d->callback && d->callback(d))910 break;911 }912 913 return count;914}915EXPORT_SYMBOL(dmi_check_system);916 917/**918 * dmi_first_match - find dmi_system_id structure matching system DMI data919 * @list: array of dmi_system_id structures to match against920 * All non-null elements of the list must match921 * their slot's (field index's) data (i.e., each922 * list string must be a substring of the specified923 * DMI slot's string data) to be considered a924 * successful match.925 *926 * Walk the blacklist table until the first match is found. Return the927 * pointer to the matching entry or NULL if there's no match.928 *929 * dmi_setup must be called before this function is called.930 */931const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)932{933 const struct dmi_system_id *d;934 935 for (d = list; !dmi_is_end_of_table(d); d++)936 if (dmi_matches(d))937 return d;938 939 return NULL;940}941EXPORT_SYMBOL(dmi_first_match);942 943/**944 * dmi_get_system_info - return DMI data value945 * @field: data index (see enum dmi_field)946 *947 * Returns one DMI data value, can be used to perform948 * complex DMI data checks.949 */950const char *dmi_get_system_info(int field)951{952 return dmi_ident[field];953}954EXPORT_SYMBOL(dmi_get_system_info);955 956/**957 * dmi_name_in_serial - Check if string is in the DMI product serial information958 * @str: string to check for959 */960int dmi_name_in_serial(const char *str)961{962 int f = DMI_PRODUCT_SERIAL;963 if (dmi_ident[f] && strstr(dmi_ident[f], str))964 return 1;965 return 0;966}967 968/**969 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name970 * @str: Case sensitive Name971 */972int dmi_name_in_vendors(const char *str)973{974 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };975 int i;976 for (i = 0; fields[i] != DMI_NONE; i++) {977 int f = fields[i];978 if (dmi_ident[f] && strstr(dmi_ident[f], str))979 return 1;980 }981 return 0;982}983EXPORT_SYMBOL(dmi_name_in_vendors);984 985/**986 * dmi_find_device - find onboard device by type/name987 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types988 * @name: device name string or %NULL to match all989 * @from: previous device found in search, or %NULL for new search.990 *991 * Iterates through the list of known onboard devices. If a device is992 * found with a matching @type and @name, a pointer to its device993 * structure is returned. Otherwise, %NULL is returned.994 * A new search is initiated by passing %NULL as the @from argument.995 * If @from is not %NULL, searches continue from next device.996 */997const struct dmi_device *dmi_find_device(int type, const char *name,998 const struct dmi_device *from)999{1000 const struct list_head *head = from ? &from->list : &dmi_devices;1001 struct list_head *d;1002 1003 for (d = head->next; d != &dmi_devices; d = d->next) {1004 const struct dmi_device *dev =1005 list_entry(d, struct dmi_device, list);1006 1007 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&1008 ((name == NULL) || (strcmp(dev->name, name) == 0)))1009 return dev;1010 }1011 1012 return NULL;1013}1014EXPORT_SYMBOL(dmi_find_device);1015 1016/**1017 * dmi_get_date - parse a DMI date1018 * @field: data index (see enum dmi_field)1019 * @yearp: optional out parameter for the year1020 * @monthp: optional out parameter for the month1021 * @dayp: optional out parameter for the day1022 *1023 * The date field is assumed to be in the form resembling1024 * [mm[/dd]]/yy[yy] and the result is stored in the out1025 * parameters any or all of which can be omitted.1026 *1027 * If the field doesn't exist, all out parameters are set to zero1028 * and false is returned. Otherwise, true is returned with any1029 * invalid part of date set to zero.1030 *1031 * On return, year, month and day are guaranteed to be in the1032 * range of [0,9999], [0,12] and [0,31] respectively.1033 */1034bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)1035{1036 int year = 0, month = 0, day = 0;1037 bool exists;1038 const char *s, *y;1039 char *e;1040 1041 s = dmi_get_system_info(field);1042 exists = s;1043 if (!exists)1044 goto out;1045 1046 /*1047 * Determine year first. We assume the date string resembles1048 * mm/dd/yy[yy] but the original code extracted only the year1049 * from the end. Keep the behavior in the spirit of no1050 * surprises.1051 */1052 y = strrchr(s, '/');1053 if (!y)1054 goto out;1055 1056 y++;1057 year = simple_strtoul(y, &e, 10);1058 if (y != e && year < 100) { /* 2-digit year */1059 year += 1900;1060 if (year < 1996) /* no dates < spec 1.0 */1061 year += 100;1062 }1063 if (year > 9999) /* year should fit in %04d */1064 year = 0;1065 1066 /* parse the mm and dd */1067 month = simple_strtoul(s, &e, 10);1068 if (s == e || *e != '/' || !month || month > 12) {1069 month = 0;1070 goto out;1071 }1072 1073 s = e + 1;1074 day = simple_strtoul(s, &e, 10);1075 if (s == y || s == e || *e != '/' || day > 31)1076 day = 0;1077out:1078 if (yearp)1079 *yearp = year;1080 if (monthp)1081 *monthp = month;1082 if (dayp)1083 *dayp = day;1084 return exists;1085}1086EXPORT_SYMBOL(dmi_get_date);1087 1088/**1089 * dmi_get_bios_year - get a year out of DMI_BIOS_DATE field1090 *1091 * Returns year on success, -ENXIO if DMI is not selected,1092 * or a different negative error code if DMI field is not present1093 * or not parseable.1094 */1095int dmi_get_bios_year(void)1096{1097 bool exists;1098 int year;1099 1100 exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);1101 if (!exists)1102 return -ENODATA;1103 1104 return year ? year : -ERANGE;1105}1106EXPORT_SYMBOL(dmi_get_bios_year);1107 1108/**1109 * dmi_walk - Walk the DMI table and get called back for every record1110 * @decode: Callback function1111 * @private_data: Private data to be passed to the callback function1112 *1113 * Returns 0 on success, -ENXIO if DMI is not selected or not present,1114 * or a different negative error code if DMI walking fails.1115 */1116int dmi_walk(void (*decode)(const struct dmi_header *, void *),1117 void *private_data)1118{1119 u8 *buf;1120 1121 if (!dmi_available)1122 return -ENXIO;1123 1124 buf = dmi_remap(dmi_base, dmi_len);1125 if (buf == NULL)1126 return -ENOMEM;1127 1128 dmi_decode_table(buf, decode, private_data);1129 1130 dmi_unmap(buf);1131 return 0;1132}1133EXPORT_SYMBOL_GPL(dmi_walk);1134 1135/**1136 * dmi_match - compare a string to the dmi field (if exists)1137 * @f: DMI field identifier1138 * @str: string to compare the DMI field to1139 *1140 * Returns true if the requested field equals to the str (including NULL).1141 */1142bool dmi_match(enum dmi_field f, const char *str)1143{1144 const char *info = dmi_get_system_info(f);1145 1146 if (info == NULL || str == NULL)1147 return info == str;1148 1149 return !strcmp(info, str);1150}1151EXPORT_SYMBOL_GPL(dmi_match);1152 1153void dmi_memdev_name(u16 handle, const char **bank, const char **device)1154{1155 int n;1156 1157 if (dmi_memdev == NULL)1158 return;1159 1160 for (n = 0; n < dmi_memdev_nr; n++) {1161 if (handle == dmi_memdev[n].handle) {1162 *bank = dmi_memdev[n].bank;1163 *device = dmi_memdev[n].device;1164 break;1165 }1166 }1167}1168EXPORT_SYMBOL_GPL(dmi_memdev_name);1169 1170u64 dmi_memdev_size(u16 handle)1171{1172 int n;1173 1174 if (dmi_memdev) {1175 for (n = 0; n < dmi_memdev_nr; n++) {1176 if (handle == dmi_memdev[n].handle)1177 return dmi_memdev[n].size;1178 }1179 }1180 return ~0ull;1181}1182EXPORT_SYMBOL_GPL(dmi_memdev_size);1183 1184/**1185 * dmi_memdev_type - get the memory type1186 * @handle: DMI structure handle1187 *1188 * Return the DMI memory type of the module in the slot associated with the1189 * given DMI handle, or 0x0 if no such DMI handle exists.1190 */1191u8 dmi_memdev_type(u16 handle)1192{1193 int n;1194 1195 if (dmi_memdev) {1196 for (n = 0; n < dmi_memdev_nr; n++) {1197 if (handle == dmi_memdev[n].handle)1198 return dmi_memdev[n].type;1199 }1200 }1201 return 0x0; /* Not a valid value */1202}1203EXPORT_SYMBOL_GPL(dmi_memdev_type);1204 1205/**1206 * dmi_memdev_handle - get the DMI handle of a memory slot1207 * @slot: slot number1208 *1209 * Return the DMI handle associated with a given memory slot, or %0xFFFF1210 * if there is no such slot.1211 */1212u16 dmi_memdev_handle(int slot)1213{1214 if (dmi_memdev && slot >= 0 && slot < dmi_memdev_nr)1215 return dmi_memdev[slot].handle;1216 1217 return 0xffff; /* Not a valid value */1218}1219EXPORT_SYMBOL_GPL(dmi_memdev_handle);1220