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1223 lines · 29.5 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2
3#define pr_fmt(fmt) "DMI: " fmt
4
5#include <linux/types.h>
6#include <linux/string.h>
7#include <linux/init.h>
8#include <linux/module.h>
9#include <linux/ctype.h>
10#include <linux/dmi.h>
11#include <linux/efi.h>
12#include <linux/memblock.h>
13#include <linux/random.h>
14#include <asm/dmi.h>
15#include <linux/unaligned.h>
16
17#ifndef SMBIOS_ENTRY_POINT_SCAN_START
18#define SMBIOS_ENTRY_POINT_SCAN_START 0xF0000
19#endif
20
21struct kobject *dmi_kobj;
22EXPORT_SYMBOL_GPL(dmi_kobj);
23
24/*
25 * DMI stands for "Desktop Management Interface". It is part
26 * of and an antecedent to, SMBIOS, which stands for System
27 * Management BIOS. See further: https://www.dmtf.org/standards
28 */
29static const char dmi_empty_string[] = "";
30
31static u32 dmi_ver __initdata;
32static u32 dmi_len;
33static u16 dmi_num;
34static u8 smbios_entry_point[32];
35static int smbios_entry_point_size;
36
37/* DMI system identification string used during boot */
38static char dmi_ids_string[128] __initdata;
39
40static struct dmi_memdev_info {
41 const char *device;
42 const char *bank;
43 u64 size; /* bytes */
44 u16 handle;
45 u8 type; /* DDR2, DDR3, DDR4 etc */
46} *dmi_memdev;
47static int dmi_memdev_nr;
48static int dmi_memdev_populated_nr __initdata;
49
50const char *dmi_string_nosave(const struct dmi_header *dm, u8 s)
51{
52 const u8 *bp = ((u8 *) dm) + dm->length;
53 const u8 *nsp;
54
55 if (s) {
56 while (--s > 0 && *bp)
57 bp += strlen(bp) + 1;
58
59 /* Strings containing only spaces are considered empty */
60 nsp = bp;
61 while (*nsp == ' ')
62 nsp++;
63 if (*nsp != '\0')
64 return bp;
65 }
66
67 return dmi_empty_string;
68}
69EXPORT_SYMBOL_GPL(dmi_string_nosave);
70
71static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
72{
73 const char *bp = dmi_string_nosave(dm, s);
74 char *str;
75 size_t len;
76
77 if (bp == dmi_empty_string)
78 return dmi_empty_string;
79
80 len = strlen(bp) + 1;
81 str = dmi_alloc(len);
82 if (str != NULL)
83 strcpy(str, bp);
84
85 return str;
86}
87
88/*
89 * We have to be cautious here. We have seen BIOSes with DMI pointers
90 * pointing to completely the wrong place for example
91 */
92static void dmi_decode_table(u8 *buf,
93 void (*decode)(const struct dmi_header *, void *),
94 void *private_data)
95{
96 u8 *data = buf;
97 int i = 0;
98
99 /*
100 * Stop when we have seen all the items the table claimed to have
101 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
102 * >= 3.0 only) OR we run off the end of the table (should never
103 * happen but sometimes does on bogus implementations.)
104 */
105 while ((!dmi_num || i < dmi_num) &&
106 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
107 const struct dmi_header *dm = (const struct dmi_header *)data;
108
109 /*
110 * If a short entry is found (less than 4 bytes), not only it
111 * is invalid, but we cannot reliably locate the next entry.
112 */
113 if (dm->length < sizeof(struct dmi_header)) {
114 pr_warn(FW_BUG
115 "Corrupted DMI table, offset %zd (only %d entries processed)\n",
116 data - buf, i);
117 break;
118 }
119
120 /*
121 * We want to know the total length (formatted area and
122 * strings) before decoding to make sure we won't run off the
123 * table in dmi_decode or dmi_string
124 */
125 data += dm->length;
126 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
127 data++;
128 if (data - buf < dmi_len - 1)
129 decode(dm, private_data);
130
131 data += 2;
132 i++;
133
134 /*
135 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
136 * For tables behind a 64-bit entry point, we have no item
137 * count and no exact table length, so stop on end-of-table
138 * marker. For tables behind a 32-bit entry point, we have
139 * seen OEM structures behind the end-of-table marker on
140 * some systems, so don't trust it.
141 */
142 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
143 break;
144 }
145
146 /* Trim DMI table length if needed */
147 if (dmi_len > data - buf)
148 dmi_len = data - buf;
149}
150
151static phys_addr_t dmi_base;
152
153static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
154 void *))
155{
156 u8 *buf;
157 u32 orig_dmi_len = dmi_len;
158
159 buf = dmi_early_remap(dmi_base, orig_dmi_len);
160 if (buf == NULL)
161 return -ENOMEM;
162
163 dmi_decode_table(buf, decode, NULL);
164
165 add_device_randomness(buf, dmi_len);
166
167 dmi_early_unmap(buf, orig_dmi_len);
168 return 0;
169}
170
171static int __init dmi_checksum(const u8 *buf, u8 len)
172{
173 u8 sum = 0;
174 int a;
175
176 for (a = 0; a < len; a++)
177 sum += buf[a];
178
179 return sum == 0;
180}
181
182static const char *dmi_ident[DMI_STRING_MAX];
183static LIST_HEAD(dmi_devices);
184int dmi_available;
185EXPORT_SYMBOL_GPL(dmi_available);
186
187/*
188 * Save a DMI string
189 */
190static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
191 int string)
192{
193 const char *d = (const char *) dm;
194 const char *p;
195
196 if (dmi_ident[slot] || dm->length <= string)
197 return;
198
199 p = dmi_string(dm, d[string]);
200 if (p == NULL)
201 return;
202
203 dmi_ident[slot] = p;
204}
205
206static void __init dmi_save_release(const struct dmi_header *dm, int slot,
207 int index)
208{
209 const u8 *minor, *major;
210 char *s;
211
212 /* If the table doesn't have the field, let's return */
213 if (dmi_ident[slot] || dm->length < index)
214 return;
215
216 minor = (u8 *) dm + index;
217 major = (u8 *) dm + index - 1;
218
219 /* As per the spec, if the system doesn't support this field,
220 * the value is FF
221 */
222 if (*major == 0xFF && *minor == 0xFF)
223 return;
224
225 s = dmi_alloc(8);
226 if (!s)
227 return;
228
229 sprintf(s, "%u.%u", *major, *minor);
230
231 dmi_ident[slot] = s;
232}
233
234static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
235 int index)
236{
237 const u8 *d;
238 char *s;
239 int is_ff = 1, is_00 = 1, i;
240
241 if (dmi_ident[slot] || dm->length < index + 16)
242 return;
243
244 d = (u8 *) dm + index;
245 for (i = 0; i < 16 && (is_ff || is_00); i++) {
246 if (d[i] != 0x00)
247 is_00 = 0;
248 if (d[i] != 0xFF)
249 is_ff = 0;
250 }
251
252 if (is_ff || is_00)
253 return;
254
255 s = dmi_alloc(16*2+4+1);
256 if (!s)
257 return;
258
259 /*
260 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
261 * the UUID are supposed to be little-endian encoded. The specification
262 * says that this is the defacto standard.
263 */
264 if (dmi_ver >= 0x020600)
265 sprintf(s, "%pUl", d);
266 else
267 sprintf(s, "%pUb", d);
268
269 dmi_ident[slot] = s;
270}
271
272static void __init dmi_save_type(const struct dmi_header *dm, int slot,
273 int index)
274{
275 const u8 *d;
276 char *s;
277
278 if (dmi_ident[slot] || dm->length <= index)
279 return;
280
281 s = dmi_alloc(4);
282 if (!s)
283 return;
284
285 d = (u8 *) dm + index;
286 sprintf(s, "%u", *d & 0x7F);
287 dmi_ident[slot] = s;
288}
289
290static void __init dmi_save_one_device(int type, const char *name)
291{
292 struct dmi_device *dev;
293
294 /* No duplicate device */
295 if (dmi_find_device(type, name, NULL))
296 return;
297
298 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
299 if (!dev)
300 return;
301
302 dev->type = type;
303 strcpy((char *)(dev + 1), name);
304 dev->name = (char *)(dev + 1);
305 dev->device_data = NULL;
306 list_add(&dev->list, &dmi_devices);
307}
308
309static void __init dmi_save_devices(const struct dmi_header *dm)
310{
311 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
312
313 for (i = 0; i < count; i++) {
314 const char *d = (char *)(dm + 1) + (i * 2);
315
316 /* Skip disabled device */
317 if ((*d & 0x80) == 0)
318 continue;
319
320 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
321 }
322}
323
324static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
325{
326 int i, count;
327 struct dmi_device *dev;
328
329 if (dm->length < 0x05)
330 return;
331
332 count = *(u8 *)(dm + 1);
333 for (i = 1; i <= count; i++) {
334 const char *devname = dmi_string(dm, i);
335
336 if (devname == dmi_empty_string)
337 continue;
338
339 dev = dmi_alloc(sizeof(*dev));
340 if (!dev)
341 break;
342
343 dev->type = DMI_DEV_TYPE_OEM_STRING;
344 dev->name = devname;
345 dev->device_data = NULL;
346
347 list_add(&dev->list, &dmi_devices);
348 }
349}
350
351static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
352{
353 struct dmi_device *dev;
354 void *data;
355
356 data = dmi_alloc(dm->length);
357 if (data == NULL)
358 return;
359
360 memcpy(data, dm, dm->length);
361
362 dev = dmi_alloc(sizeof(*dev));
363 if (!dev)
364 return;
365
366 dev->type = DMI_DEV_TYPE_IPMI;
367 dev->name = "IPMI controller";
368 dev->device_data = data;
369
370 list_add_tail(&dev->list, &dmi_devices);
371}
372
373static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
374 int devfn, const char *name, int type)
375{
376 struct dmi_dev_onboard *dev;
377
378 /* Ignore invalid values */
379 if (type == DMI_DEV_TYPE_DEV_SLOT &&
380 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
381 return;
382
383 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
384 if (!dev)
385 return;
386
387 dev->instance = instance;
388 dev->segment = segment;
389 dev->bus = bus;
390 dev->devfn = devfn;
391
392 strcpy((char *)&dev[1], name);
393 dev->dev.type = type;
394 dev->dev.name = (char *)&dev[1];
395 dev->dev.device_data = dev;
396
397 list_add(&dev->dev.list, &dmi_devices);
398}
399
400static void __init dmi_save_extended_devices(const struct dmi_header *dm)
401{
402 const char *name;
403 const u8 *d = (u8 *)dm;
404
405 if (dm->length < 0x0B)
406 return;
407
408 /* Skip disabled device */
409 if ((d[0x5] & 0x80) == 0)
410 return;
411
412 name = dmi_string_nosave(dm, d[0x4]);
413 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
414 DMI_DEV_TYPE_DEV_ONBOARD);
415 dmi_save_one_device(d[0x5] & 0x7f, name);
416}
417
418static void __init dmi_save_system_slot(const struct dmi_header *dm)
419{
420 const u8 *d = (u8 *)dm;
421
422 /* Need SMBIOS 2.6+ structure */
423 if (dm->length < 0x11)
424 return;
425 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
426 d[0x10], dmi_string_nosave(dm, d[0x4]),
427 DMI_DEV_TYPE_DEV_SLOT);
428}
429
430static void __init count_mem_devices(const struct dmi_header *dm, void *v)
431{
432 if (dm->type != DMI_ENTRY_MEM_DEVICE)
433 return;
434 dmi_memdev_nr++;
435}
436
437static void __init save_mem_devices(const struct dmi_header *dm, void *v)
438{
439 const char *d = (const char *)dm;
440 static int nr;
441 u64 bytes;
442 u16 size;
443
444 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13)
445 return;
446 if (nr >= dmi_memdev_nr) {
447 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
448 return;
449 }
450 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
451 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
452 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
453 dmi_memdev[nr].type = d[0x12];
454
455 size = get_unaligned((u16 *)&d[0xC]);
456 if (size == 0)
457 bytes = 0;
458 else if (size == 0xffff)
459 bytes = ~0ull;
460 else if (size & 0x8000)
461 bytes = (u64)(size & 0x7fff) << 10;
462 else if (size != 0x7fff || dm->length < 0x20)
463 bytes = (u64)size << 20;
464 else
465 bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
466
467 if (bytes)
468 dmi_memdev_populated_nr++;
469
470 dmi_memdev[nr].size = bytes;
471 nr++;
472}
473
474static void __init dmi_memdev_walk(void)
475{
476 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
477 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
478 if (dmi_memdev)
479 dmi_walk_early(save_mem_devices);
480 }
481}
482
483/*
484 * Process a DMI table entry. Right now all we care about are the BIOS
485 * and machine entries. For 2.5 we should pull the smbus controller info
486 * out of here.
487 */
488static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
489{
490 switch (dm->type) {
491 case DMI_ENTRY_BIOS:
492 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
493 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
494 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
495 dmi_save_release(dm, DMI_BIOS_RELEASE, 21);
496 dmi_save_release(dm, DMI_EC_FIRMWARE_RELEASE, 23);
497 break;
498 case DMI_ENTRY_SYSTEM:
499 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
500 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
501 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
502 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
503 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
504 dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);
505 dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
506 break;
507 case DMI_ENTRY_BASEBOARD:
508 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
509 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
510 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
511 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
512 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
513 break;
514 case DMI_ENTRY_CHASSIS:
515 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
516 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
517 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
518 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
519 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
520 break;
521 case DMI_ENTRY_SYSTEM_SLOT:
522 dmi_save_system_slot(dm);
523 break;
524 case DMI_ENTRY_ONBOARD_DEVICE:
525 dmi_save_devices(dm);
526 break;
527 case DMI_ENTRY_OEMSTRINGS:
528 dmi_save_oem_strings_devices(dm);
529 break;
530 case DMI_ENTRY_IPMI_DEV:
531 dmi_save_ipmi_device(dm);
532 break;
533 case DMI_ENTRY_ONBOARD_DEV_EXT:
534 dmi_save_extended_devices(dm);
535 }
536}
537
538static int __init print_filtered(char *buf, size_t len, const char *info)
539{
540 int c = 0;
541 const char *p;
542
543 if (!info)
544 return c;
545
546 for (p = info; *p; p++)
547 if (isprint(*p))
548 c += scnprintf(buf + c, len - c, "%c", *p);
549 else
550 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
551 return c;
552}
553
554static void __init dmi_format_ids(char *buf, size_t len)
555{
556 int c = 0;
557 const char *board; /* Board Name is optional */
558
559 c += print_filtered(buf + c, len - c,
560 dmi_get_system_info(DMI_SYS_VENDOR));
561 c += scnprintf(buf + c, len - c, " ");
562 c += print_filtered(buf + c, len - c,
563 dmi_get_system_info(DMI_PRODUCT_NAME));
564
565 board = dmi_get_system_info(DMI_BOARD_NAME);
566 if (board) {
567 c += scnprintf(buf + c, len - c, "/");
568 c += print_filtered(buf + c, len - c, board);
569 }
570 c += scnprintf(buf + c, len - c, ", BIOS ");
571 c += print_filtered(buf + c, len - c,
572 dmi_get_system_info(DMI_BIOS_VERSION));
573 c += scnprintf(buf + c, len - c, " ");
574 c += print_filtered(buf + c, len - c,
575 dmi_get_system_info(DMI_BIOS_DATE));
576}
577
578/*
579 * Check for DMI/SMBIOS headers in the system firmware image. Any
580 * SMBIOS header must start 16 bytes before the DMI header, so take a
581 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
582 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
583 * takes precedence) and return 0. Otherwise return 1.
584 */
585static int __init dmi_present(const u8 *buf)
586{
587 u32 smbios_ver;
588
589 /*
590 * The size of this structure is 31 bytes, but we also accept value
591 * 30 due to a mistake in SMBIOS specification version 2.1.
592 */
593 if (memcmp(buf, "_SM_", 4) == 0 &&
594 buf[5] >= 30 && buf[5] <= 32 &&
595 dmi_checksum(buf, buf[5])) {
596 smbios_ver = get_unaligned_be16(buf + 6);
597 smbios_entry_point_size = buf[5];
598 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
599
600 /* Some BIOS report weird SMBIOS version, fix that up */
601 switch (smbios_ver) {
602 case 0x021F:
603 case 0x0221:
604 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
605 smbios_ver & 0xFF, 3);
606 smbios_ver = 0x0203;
607 break;
608 case 0x0233:
609 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
610 smbios_ver = 0x0206;
611 break;
612 }
613 } else {
614 smbios_ver = 0;
615 }
616
617 buf += 16;
618
619 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
620 if (smbios_ver)
621 dmi_ver = smbios_ver;
622 else
623 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
624 dmi_ver <<= 8;
625 dmi_num = get_unaligned_le16(buf + 12);
626 dmi_len = get_unaligned_le16(buf + 6);
627 dmi_base = get_unaligned_le32(buf + 8);
628
629 if (dmi_walk_early(dmi_decode) == 0) {
630 if (smbios_ver) {
631 pr_info("SMBIOS %d.%d present.\n",
632 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
633 } else {
634 smbios_entry_point_size = 15;
635 memcpy(smbios_entry_point, buf,
636 smbios_entry_point_size);
637 pr_info("Legacy DMI %d.%d present.\n",
638 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
639 }
640 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
641 pr_info("%s\n", dmi_ids_string);
642 return 0;
643 }
644 }
645
646 return 1;
647}
648
649/*
650 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
651 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
652 */
653static int __init dmi_smbios3_present(const u8 *buf)
654{
655 if (memcmp(buf, "_SM3_", 5) == 0 &&
656 buf[6] >= 24 && buf[6] <= 32 &&
657 dmi_checksum(buf, buf[6])) {
658 dmi_ver = get_unaligned_be24(buf + 7);
659 dmi_num = 0; /* No longer specified */
660 dmi_len = get_unaligned_le32(buf + 12);
661 dmi_base = get_unaligned_le64(buf + 16);
662 smbios_entry_point_size = buf[6];
663 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
664
665 if (dmi_walk_early(dmi_decode) == 0) {
666 pr_info("SMBIOS %d.%d.%d present.\n",
667 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
668 dmi_ver & 0xFF);
669 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
670 pr_info("%s\n", dmi_ids_string);
671 return 0;
672 }
673 }
674 return 1;
675}
676
677static void __init dmi_scan_machine(void)
678{
679 char __iomem *p, *q;
680 char buf[32];
681
682 if (efi_enabled(EFI_CONFIG_TABLES)) {
683 /*
684 * According to the DMTF SMBIOS reference spec v3.0.0, it is
685 * allowed to define both the 64-bit entry point (smbios3) and
686 * the 32-bit entry point (smbios), in which case they should
687 * either both point to the same SMBIOS structure table, or the
688 * table pointed to by the 64-bit entry point should contain a
689 * superset of the table contents pointed to by the 32-bit entry
690 * point (section 5.2)
691 * This implies that the 64-bit entry point should have
692 * precedence if it is defined and supported by the OS. If we
693 * have the 64-bit entry point, but fail to decode it, fall
694 * back to the legacy one (if available)
695 */
696 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
697 p = dmi_early_remap(efi.smbios3, 32);
698 if (p == NULL)
699 goto error;
700 memcpy_fromio(buf, p, 32);
701 dmi_early_unmap(p, 32);
702
703 if (!dmi_smbios3_present(buf)) {
704 dmi_available = 1;
705 return;
706 }
707 }
708 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
709 goto error;
710
711 /* This is called as a core_initcall() because it isn't
712 * needed during early boot. This also means we can
713 * iounmap the space when we're done with it.
714 */
715 p = dmi_early_remap(efi.smbios, 32);
716 if (p == NULL)
717 goto error;
718 memcpy_fromio(buf, p, 32);
719 dmi_early_unmap(p, 32);
720
721 if (!dmi_present(buf)) {
722 dmi_available = 1;
723 return;
724 }
725 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
726 p = dmi_early_remap(SMBIOS_ENTRY_POINT_SCAN_START, 0x10000);
727 if (p == NULL)
728 goto error;
729
730 /*
731 * Same logic as above, look for a 64-bit entry point
732 * first, and if not found, fall back to 32-bit entry point.
733 */
734 memcpy_fromio(buf, p, 16);
735 for (q = p + 16; q < p + 0x10000; q += 16) {
736 memcpy_fromio(buf + 16, q, 16);
737 if (!dmi_smbios3_present(buf)) {
738 dmi_available = 1;
739 dmi_early_unmap(p, 0x10000);
740 return;
741 }
742 memcpy(buf, buf + 16, 16);
743 }
744
745 /*
746 * Iterate over all possible DMI header addresses q.
747 * Maintain the 32 bytes around q in buf. On the
748 * first iteration, substitute zero for the
749 * out-of-range bytes so there is no chance of falsely
750 * detecting an SMBIOS header.
751 */
752 memset(buf, 0, 16);
753 for (q = p; q < p + 0x10000; q += 16) {
754 memcpy_fromio(buf + 16, q, 16);
755 if (!dmi_present(buf)) {
756 dmi_available = 1;
757 dmi_early_unmap(p, 0x10000);
758 return;
759 }
760 memcpy(buf, buf + 16, 16);
761 }
762 dmi_early_unmap(p, 0x10000);
763 }
764 error:
765 pr_info("not present or invalid.\n");
766}
767
768static __ro_after_init BIN_ATTR_SIMPLE_ADMIN_RO(smbios_entry_point);
769static __ro_after_init BIN_ATTR_SIMPLE_ADMIN_RO(DMI);
770
771static int __init dmi_init(void)
772{
773 struct kobject *tables_kobj;
774 u8 *dmi_table;
775 int ret = -ENOMEM;
776
777 if (!dmi_available)
778 return 0;
779
780 /*
781 * Set up dmi directory at /sys/firmware/dmi. This entry should stay
782 * even after farther error, as it can be used by other modules like
783 * dmi-sysfs.
784 */
785 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
786 if (!dmi_kobj)
787 goto err;
788
789 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
790 if (!tables_kobj)
791 goto err;
792
793 dmi_table = dmi_remap(dmi_base, dmi_len);
794 if (!dmi_table)
795 goto err_tables;
796
797 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
798 bin_attr_smbios_entry_point.private = smbios_entry_point;
799 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
800 if (ret)
801 goto err_unmap;
802
803 bin_attr_DMI.size = dmi_len;
804 bin_attr_DMI.private = dmi_table;
805 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
806 if (!ret)
807 return 0;
808
809 sysfs_remove_bin_file(tables_kobj,
810 &bin_attr_smbios_entry_point);
811 err_unmap:
812 dmi_unmap(dmi_table);
813 err_tables:
814 kobject_del(tables_kobj);
815 kobject_put(tables_kobj);
816 err:
817 pr_err("Firmware registration failed.\n");
818
819 return ret;
820}
821subsys_initcall(dmi_init);
822
823/**
824 * dmi_setup - scan and setup DMI system information
825 *
826 * Scan the DMI system information. This setups DMI identifiers
827 * (dmi_system_id) for printing it out on task dumps and prepares
828 * DIMM entry information (dmi_memdev_info) from the SMBIOS table
829 * for using this when reporting memory errors.
830 */
831void __init dmi_setup(void)
832{
833 dmi_scan_machine();
834 if (!dmi_available)
835 return;
836
837 dmi_memdev_walk();
838 pr_info("Memory slots populated: %d/%d\n",
839 dmi_memdev_populated_nr, dmi_memdev_nr);
840 dump_stack_set_arch_desc("%s", dmi_ids_string);
841}
842
843/**
844 * dmi_matches - check if dmi_system_id structure matches system DMI data
845 * @dmi: pointer to the dmi_system_id structure to check
846 */
847static bool dmi_matches(const struct dmi_system_id *dmi)
848{
849 int i;
850
851 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
852 int s = dmi->matches[i].slot;
853 if (s == DMI_NONE)
854 break;
855 if (s == DMI_OEM_STRING) {
856 /* DMI_OEM_STRING must be exact match */
857 const struct dmi_device *valid;
858
859 valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,
860 dmi->matches[i].substr, NULL);
861 if (valid)
862 continue;
863 } else if (dmi_ident[s]) {
864 if (dmi->matches[i].exact_match) {
865 if (!strcmp(dmi_ident[s],
866 dmi->matches[i].substr))
867 continue;
868 } else {
869 if (strstr(dmi_ident[s],
870 dmi->matches[i].substr))
871 continue;
872 }
873 }
874
875 /* No match */
876 return false;
877 }
878 return true;
879}
880
881/**
882 * dmi_is_end_of_table - check for end-of-table marker
883 * @dmi: pointer to the dmi_system_id structure to check
884 */
885static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
886{
887 return dmi->matches[0].slot == DMI_NONE;
888}
889
890/**
891 * dmi_check_system - check system DMI data
892 * @list: array of dmi_system_id structures to match against
893 * All non-null elements of the list must match
894 * their slot's (field index's) data (i.e., each
895 * list string must be a substring of the specified
896 * DMI slot's string data) to be considered a
897 * successful match.
898 *
899 * Walk the blacklist table running matching functions until someone
900 * returns non zero or we hit the end. Callback function is called for
901 * each successful match. Returns the number of matches.
902 *
903 * dmi_setup must be called before this function is called.
904 */
905int dmi_check_system(const struct dmi_system_id *list)
906{
907 int count = 0;
908 const struct dmi_system_id *d;
909
910 for (d = list; !dmi_is_end_of_table(d); d++)
911 if (dmi_matches(d)) {
912 count++;
913 if (d->callback && d->callback(d))
914 break;
915 }
916
917 return count;
918}
919EXPORT_SYMBOL(dmi_check_system);
920
921/**
922 * dmi_first_match - find dmi_system_id structure matching system DMI data
923 * @list: array of dmi_system_id structures to match against
924 * All non-null elements of the list must match
925 * their slot's (field index's) data (i.e., each
926 * list string must be a substring of the specified
927 * DMI slot's string data) to be considered a
928 * successful match.
929 *
930 * Walk the blacklist table until the first match is found. Return the
931 * pointer to the matching entry or NULL if there's no match.
932 *
933 * dmi_setup must be called before this function is called.
934 */
935const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
936{
937 const struct dmi_system_id *d;
938
939 for (d = list; !dmi_is_end_of_table(d); d++)
940 if (dmi_matches(d))
941 return d;
942
943 return NULL;
944}
945EXPORT_SYMBOL(dmi_first_match);
946
947/**
948 * dmi_get_system_info - return DMI data value
949 * @field: data index (see enum dmi_field)
950 *
951 * Returns one DMI data value, can be used to perform
952 * complex DMI data checks.
953 */
954const char *dmi_get_system_info(int field)
955{
956 return dmi_ident[field];
957}
958EXPORT_SYMBOL(dmi_get_system_info);
959
960/**
961 * dmi_name_in_serial - Check if string is in the DMI product serial information
962 * @str: string to check for
963 */
964int dmi_name_in_serial(const char *str)
965{
966 int f = DMI_PRODUCT_SERIAL;
967 if (dmi_ident[f] && strstr(dmi_ident[f], str))
968 return 1;
969 return 0;
970}
971
972/**
973 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
974 * @str: Case sensitive Name
975 */
976int dmi_name_in_vendors(const char *str)
977{
978 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
979 int i;
980 for (i = 0; fields[i] != DMI_NONE; i++) {
981 int f = fields[i];
982 if (dmi_ident[f] && strstr(dmi_ident[f], str))
983 return 1;
984 }
985 return 0;
986}
987EXPORT_SYMBOL(dmi_name_in_vendors);
988
989/**
990 * dmi_find_device - find onboard device by type/name
991 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
992 * @name: device name string or %NULL to match all
993 * @from: previous device found in search, or %NULL for new search.
994 *
995 * Iterates through the list of known onboard devices. If a device is
996 * found with a matching @type and @name, a pointer to its device
997 * structure is returned. Otherwise, %NULL is returned.
998 * A new search is initiated by passing %NULL as the @from argument.
999 * If @from is not %NULL, searches continue from next device.
1000 */
1001const struct dmi_device *dmi_find_device(int type, const char *name,
1002 const struct dmi_device *from)
1003{
1004 const struct list_head *head = from ? &from->list : &dmi_devices;
1005 struct list_head *d;
1006
1007 for (d = head->next; d != &dmi_devices; d = d->next) {
1008 const struct dmi_device *dev =
1009 list_entry(d, struct dmi_device, list);
1010
1011 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
1012 ((name == NULL) || (strcmp(dev->name, name) == 0)))
1013 return dev;
1014 }
1015
1016 return NULL;
1017}
1018EXPORT_SYMBOL(dmi_find_device);
1019
1020/**
1021 * dmi_get_date - parse a DMI date
1022 * @field: data index (see enum dmi_field)
1023 * @yearp: optional out parameter for the year
1024 * @monthp: optional out parameter for the month
1025 * @dayp: optional out parameter for the day
1026 *
1027 * The date field is assumed to be in the form resembling
1028 * [mm[/dd]]/yy[yy] and the result is stored in the out
1029 * parameters any or all of which can be omitted.
1030 *
1031 * If the field doesn't exist, all out parameters are set to zero
1032 * and false is returned. Otherwise, true is returned with any
1033 * invalid part of date set to zero.
1034 *
1035 * On return, year, month and day are guaranteed to be in the
1036 * range of [0,9999], [0,12] and [0,31] respectively.
1037 */
1038bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
1039{
1040 int year = 0, month = 0, day = 0;
1041 bool exists;
1042 const char *s, *y;
1043 char *e;
1044
1045 s = dmi_get_system_info(field);
1046 exists = s;
1047 if (!exists)
1048 goto out;
1049
1050 /*
1051 * Determine year first. We assume the date string resembles
1052 * mm/dd/yy[yy] but the original code extracted only the year
1053 * from the end. Keep the behavior in the spirit of no
1054 * surprises.
1055 */
1056 y = strrchr(s, '/');
1057 if (!y)
1058 goto out;
1059
1060 y++;
1061 year = simple_strtoul(y, &e, 10);
1062 if (y != e && year < 100) { /* 2-digit year */
1063 year += 1900;
1064 if (year < 1996) /* no dates < spec 1.0 */
1065 year += 100;
1066 }
1067 if (year > 9999) /* year should fit in %04d */
1068 year = 0;
1069
1070 /* parse the mm and dd */
1071 month = simple_strtoul(s, &e, 10);
1072 if (s == e || *e != '/' || !month || month > 12) {
1073 month = 0;
1074 goto out;
1075 }
1076
1077 s = e + 1;
1078 day = simple_strtoul(s, &e, 10);
1079 if (s == y || s == e || *e != '/' || day > 31)
1080 day = 0;
1081out:
1082 if (yearp)
1083 *yearp = year;
1084 if (monthp)
1085 *monthp = month;
1086 if (dayp)
1087 *dayp = day;
1088 return exists;
1089}
1090EXPORT_SYMBOL(dmi_get_date);
1091
1092/**
1093 * dmi_get_bios_year - get a year out of DMI_BIOS_DATE field
1094 *
1095 * Returns year on success, -ENXIO if DMI is not selected,
1096 * or a different negative error code if DMI field is not present
1097 * or not parseable.
1098 */
1099int dmi_get_bios_year(void)
1100{
1101 bool exists;
1102 int year;
1103
1104 exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
1105 if (!exists)
1106 return -ENODATA;
1107
1108 return year ? year : -ERANGE;
1109}
1110EXPORT_SYMBOL(dmi_get_bios_year);
1111
1112/**
1113 * dmi_walk - Walk the DMI table and get called back for every record
1114 * @decode: Callback function
1115 * @private_data: Private data to be passed to the callback function
1116 *
1117 * Returns 0 on success, -ENXIO if DMI is not selected or not present,
1118 * or a different negative error code if DMI walking fails.
1119 */
1120int dmi_walk(void (*decode)(const struct dmi_header *, void *),
1121 void *private_data)
1122{
1123 u8 *buf;
1124
1125 if (!dmi_available)
1126 return -ENXIO;
1127
1128 buf = dmi_remap(dmi_base, dmi_len);
1129 if (buf == NULL)
1130 return -ENOMEM;
1131
1132 dmi_decode_table(buf, decode, private_data);
1133
1134 dmi_unmap(buf);
1135 return 0;
1136}
1137EXPORT_SYMBOL_GPL(dmi_walk);
1138
1139/**
1140 * dmi_match - compare a string to the dmi field (if exists)
1141 * @f: DMI field identifier
1142 * @str: string to compare the DMI field to
1143 *
1144 * Returns true if the requested field equals to the str (including NULL).
1145 */
1146bool dmi_match(enum dmi_field f, const char *str)
1147{
1148 const char *info = dmi_get_system_info(f);
1149
1150 if (info == NULL || str == NULL)
1151 return info == str;
1152
1153 return !strcmp(info, str);
1154}
1155EXPORT_SYMBOL_GPL(dmi_match);
1156
1157void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1158{
1159 int n;
1160
1161 if (dmi_memdev == NULL)
1162 return;
1163
1164 for (n = 0; n < dmi_memdev_nr; n++) {
1165 if (handle == dmi_memdev[n].handle) {
1166 *bank = dmi_memdev[n].bank;
1167 *device = dmi_memdev[n].device;
1168 break;
1169 }
1170 }
1171}
1172EXPORT_SYMBOL_GPL(dmi_memdev_name);
1173
1174u64 dmi_memdev_size(u16 handle)
1175{
1176 int n;
1177
1178 if (dmi_memdev) {
1179 for (n = 0; n < dmi_memdev_nr; n++) {
1180 if (handle == dmi_memdev[n].handle)
1181 return dmi_memdev[n].size;
1182 }
1183 }
1184 return ~0ull;
1185}
1186EXPORT_SYMBOL_GPL(dmi_memdev_size);
1187
1188/**
1189 * dmi_memdev_type - get the memory type
1190 * @handle: DMI structure handle
1191 *
1192 * Return the DMI memory type of the module in the slot associated with the
1193 * given DMI handle, or 0x0 if no such DMI handle exists.
1194 */
1195u8 dmi_memdev_type(u16 handle)
1196{
1197 int n;
1198
1199 if (dmi_memdev) {
1200 for (n = 0; n < dmi_memdev_nr; n++) {
1201 if (handle == dmi_memdev[n].handle)
1202 return dmi_memdev[n].type;
1203 }
1204 }
1205 return 0x0; /* Not a valid value */
1206}
1207EXPORT_SYMBOL_GPL(dmi_memdev_type);
1208
1209/**
1210 * dmi_memdev_handle - get the DMI handle of a memory slot
1211 * @slot: slot number
1212 *
1213 * Return the DMI handle associated with a given memory slot, or %0xFFFF
1214 * if there is no such slot.
1215 */
1216u16 dmi_memdev_handle(int slot)
1217{
1218 if (dmi_memdev && slot >= 0 && slot < dmi_memdev_nr)
1219 return dmi_memdev[slot].handle;
1220
1221 return 0xffff; /* Not a valid value */
1222}
1223EXPORT_SYMBOL_GPL(dmi_memdev_handle);