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1#include <linux/types.h>
2#include <linux/string.h>
3#include <linux/init.h>
4#include <linux/module.h>
5#include <linux/ctype.h>
6#include <linux/dmi.h>
7#include <linux/efi.h>
8#include <linux/bootmem.h>
9#include <linux/random.h>
10#include <asm/dmi.h>
11#include <asm/unaligned.h>
12
13struct kobject *dmi_kobj;
14EXPORT_SYMBOL_GPL(dmi_kobj);
15
16/*
17 * DMI stands for "Desktop Management Interface". It is part
18 * of and an antecedent to, SMBIOS, which stands for System
19 * Management BIOS. See further: http://www.dmtf.org/standards
20 */
21static const char dmi_empty_string[] = " ";
22
23static u32 dmi_ver __initdata;
24static u32 dmi_len;
25static u16 dmi_num;
26static u8 smbios_entry_point[32];
27static int smbios_entry_point_size;
28
29/*
30 * Catch too early calls to dmi_check_system():
31 */
32static int dmi_initialized;
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 u16 handle;
41} *dmi_memdev;
42static int dmi_memdev_nr;
43
44static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
45{
46 const u8 *bp = ((u8 *) dm) + dm->length;
47
48 if (s) {
49 s--;
50 while (s > 0 && *bp) {
51 bp += strlen(bp) + 1;
52 s--;
53 }
54
55 if (*bp != 0) {
56 size_t len = strlen(bp)+1;
57 size_t cmp_len = len > 8 ? 8 : len;
58
59 if (!memcmp(bp, dmi_empty_string, cmp_len))
60 return dmi_empty_string;
61 return bp;
62 }
63 }
64
65 return "";
66}
67
68static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
69{
70 const char *bp = dmi_string_nosave(dm, s);
71 char *str;
72 size_t len;
73
74 if (bp == dmi_empty_string)
75 return dmi_empty_string;
76
77 len = strlen(bp) + 1;
78 str = dmi_alloc(len);
79 if (str != NULL)
80 strcpy(str, bp);
81
82 return str;
83}
84
85/*
86 * We have to be cautious here. We have seen BIOSes with DMI pointers
87 * pointing to completely the wrong place for example
88 */
89static void dmi_decode_table(u8 *buf,
90 void (*decode)(const struct dmi_header *, void *),
91 void *private_data)
92{
93 u8 *data = buf;
94 int i = 0;
95
96 /*
97 * Stop when we have seen all the items the table claimed to have
98 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
99 * >= 3.0 only) OR we run off the end of the table (should never
100 * happen but sometimes does on bogus implementations.)
101 */
102 while ((!dmi_num || i < dmi_num) &&
103 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
104 const struct dmi_header *dm = (const struct dmi_header *)data;
105
106 /*
107 * We want to know the total length (formatted area and
108 * strings) before decoding to make sure we won't run off the
109 * table in dmi_decode or dmi_string
110 */
111 data += dm->length;
112 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
113 data++;
114 if (data - buf < dmi_len - 1)
115 decode(dm, private_data);
116
117 data += 2;
118 i++;
119
120 /*
121 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
122 * For tables behind a 64-bit entry point, we have no item
123 * count and no exact table length, so stop on end-of-table
124 * marker. For tables behind a 32-bit entry point, we have
125 * seen OEM structures behind the end-of-table marker on
126 * some systems, so don't trust it.
127 */
128 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
129 break;
130 }
131
132 /* Trim DMI table length if needed */
133 if (dmi_len > data - buf)
134 dmi_len = data - buf;
135}
136
137static phys_addr_t dmi_base;
138
139static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
140 void *))
141{
142 u8 *buf;
143 u32 orig_dmi_len = dmi_len;
144
145 buf = dmi_early_remap(dmi_base, orig_dmi_len);
146 if (buf == NULL)
147 return -1;
148
149 dmi_decode_table(buf, decode, NULL);
150
151 add_device_randomness(buf, dmi_len);
152
153 dmi_early_unmap(buf, orig_dmi_len);
154 return 0;
155}
156
157static int __init dmi_checksum(const u8 *buf, u8 len)
158{
159 u8 sum = 0;
160 int a;
161
162 for (a = 0; a < len; a++)
163 sum += buf[a];
164
165 return sum == 0;
166}
167
168static const char *dmi_ident[DMI_STRING_MAX];
169static LIST_HEAD(dmi_devices);
170int dmi_available;
171
172/*
173 * Save a DMI string
174 */
175static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
176 int string)
177{
178 const char *d = (const char *) dm;
179 const char *p;
180
181 if (dmi_ident[slot])
182 return;
183
184 p = dmi_string(dm, d[string]);
185 if (p == NULL)
186 return;
187
188 dmi_ident[slot] = p;
189}
190
191static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
192 int index)
193{
194 const u8 *d = (u8 *) dm + index;
195 char *s;
196 int is_ff = 1, is_00 = 1, i;
197
198 if (dmi_ident[slot])
199 return;
200
201 for (i = 0; i < 16 && (is_ff || is_00); i++) {
202 if (d[i] != 0x00)
203 is_00 = 0;
204 if (d[i] != 0xFF)
205 is_ff = 0;
206 }
207
208 if (is_ff || is_00)
209 return;
210
211 s = dmi_alloc(16*2+4+1);
212 if (!s)
213 return;
214
215 /*
216 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
217 * the UUID are supposed to be little-endian encoded. The specification
218 * says that this is the defacto standard.
219 */
220 if (dmi_ver >= 0x020600)
221 sprintf(s, "%pUL", d);
222 else
223 sprintf(s, "%pUB", d);
224
225 dmi_ident[slot] = s;
226}
227
228static void __init dmi_save_type(const struct dmi_header *dm, int slot,
229 int index)
230{
231 const u8 *d = (u8 *) dm + index;
232 char *s;
233
234 if (dmi_ident[slot])
235 return;
236
237 s = dmi_alloc(4);
238 if (!s)
239 return;
240
241 sprintf(s, "%u", *d & 0x7F);
242 dmi_ident[slot] = s;
243}
244
245static void __init dmi_save_one_device(int type, const char *name)
246{
247 struct dmi_device *dev;
248
249 /* No duplicate device */
250 if (dmi_find_device(type, name, NULL))
251 return;
252
253 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
254 if (!dev)
255 return;
256
257 dev->type = type;
258 strcpy((char *)(dev + 1), name);
259 dev->name = (char *)(dev + 1);
260 dev->device_data = NULL;
261 list_add(&dev->list, &dmi_devices);
262}
263
264static void __init dmi_save_devices(const struct dmi_header *dm)
265{
266 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
267
268 for (i = 0; i < count; i++) {
269 const char *d = (char *)(dm + 1) + (i * 2);
270
271 /* Skip disabled device */
272 if ((*d & 0x80) == 0)
273 continue;
274
275 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
276 }
277}
278
279static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
280{
281 int i, count = *(u8 *)(dm + 1);
282 struct dmi_device *dev;
283
284 for (i = 1; i <= count; i++) {
285 const char *devname = dmi_string(dm, i);
286
287 if (devname == dmi_empty_string)
288 continue;
289
290 dev = dmi_alloc(sizeof(*dev));
291 if (!dev)
292 break;
293
294 dev->type = DMI_DEV_TYPE_OEM_STRING;
295 dev->name = devname;
296 dev->device_data = NULL;
297
298 list_add(&dev->list, &dmi_devices);
299 }
300}
301
302static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
303{
304 struct dmi_device *dev;
305 void *data;
306
307 data = dmi_alloc(dm->length);
308 if (data == NULL)
309 return;
310
311 memcpy(data, dm, dm->length);
312
313 dev = dmi_alloc(sizeof(*dev));
314 if (!dev)
315 return;
316
317 dev->type = DMI_DEV_TYPE_IPMI;
318 dev->name = "IPMI controller";
319 dev->device_data = data;
320
321 list_add_tail(&dev->list, &dmi_devices);
322}
323
324static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
325 int devfn, const char *name, int type)
326{
327 struct dmi_dev_onboard *dev;
328
329 /* Ignore invalid values */
330 if (type == DMI_DEV_TYPE_DEV_SLOT &&
331 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
332 return;
333
334 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
335 if (!dev)
336 return;
337
338 dev->instance = instance;
339 dev->segment = segment;
340 dev->bus = bus;
341 dev->devfn = devfn;
342
343 strcpy((char *)&dev[1], name);
344 dev->dev.type = type;
345 dev->dev.name = (char *)&dev[1];
346 dev->dev.device_data = dev;
347
348 list_add(&dev->dev.list, &dmi_devices);
349}
350
351static void __init dmi_save_extended_devices(const struct dmi_header *dm)
352{
353 const char *name;
354 const u8 *d = (u8 *)dm;
355
356 /* Skip disabled device */
357 if ((d[0x5] & 0x80) == 0)
358 return;
359
360 name = dmi_string_nosave(dm, d[0x4]);
361 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
362 DMI_DEV_TYPE_DEV_ONBOARD);
363 dmi_save_one_device(d[0x5] & 0x7f, name);
364}
365
366static void __init dmi_save_system_slot(const struct dmi_header *dm)
367{
368 const u8 *d = (u8 *)dm;
369
370 /* Need SMBIOS 2.6+ structure */
371 if (dm->length < 0x11)
372 return;
373 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
374 d[0x10], dmi_string_nosave(dm, d[0x4]),
375 DMI_DEV_TYPE_DEV_SLOT);
376}
377
378static void __init count_mem_devices(const struct dmi_header *dm, void *v)
379{
380 if (dm->type != DMI_ENTRY_MEM_DEVICE)
381 return;
382 dmi_memdev_nr++;
383}
384
385static void __init save_mem_devices(const struct dmi_header *dm, void *v)
386{
387 const char *d = (const char *)dm;
388 static int nr;
389
390 if (dm->type != DMI_ENTRY_MEM_DEVICE)
391 return;
392 if (nr >= dmi_memdev_nr) {
393 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
394 return;
395 }
396 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
397 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
398 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
399 nr++;
400}
401
402void __init dmi_memdev_walk(void)
403{
404 if (!dmi_available)
405 return;
406
407 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
408 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
409 if (dmi_memdev)
410 dmi_walk_early(save_mem_devices);
411 }
412}
413
414/*
415 * Process a DMI table entry. Right now all we care about are the BIOS
416 * and machine entries. For 2.5 we should pull the smbus controller info
417 * out of here.
418 */
419static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
420{
421 switch (dm->type) {
422 case 0: /* BIOS Information */
423 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
424 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
425 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
426 break;
427 case 1: /* System Information */
428 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
429 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
430 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
431 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
432 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
433 break;
434 case 2: /* Base Board Information */
435 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
436 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
437 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
438 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
439 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
440 break;
441 case 3: /* Chassis Information */
442 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
443 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
444 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
445 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
446 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
447 break;
448 case 9: /* System Slots */
449 dmi_save_system_slot(dm);
450 break;
451 case 10: /* Onboard Devices Information */
452 dmi_save_devices(dm);
453 break;
454 case 11: /* OEM Strings */
455 dmi_save_oem_strings_devices(dm);
456 break;
457 case 38: /* IPMI Device Information */
458 dmi_save_ipmi_device(dm);
459 break;
460 case 41: /* Onboard Devices Extended Information */
461 dmi_save_extended_devices(dm);
462 }
463}
464
465static int __init print_filtered(char *buf, size_t len, const char *info)
466{
467 int c = 0;
468 const char *p;
469
470 if (!info)
471 return c;
472
473 for (p = info; *p; p++)
474 if (isprint(*p))
475 c += scnprintf(buf + c, len - c, "%c", *p);
476 else
477 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
478 return c;
479}
480
481static void __init dmi_format_ids(char *buf, size_t len)
482{
483 int c = 0;
484 const char *board; /* Board Name is optional */
485
486 c += print_filtered(buf + c, len - c,
487 dmi_get_system_info(DMI_SYS_VENDOR));
488 c += scnprintf(buf + c, len - c, " ");
489 c += print_filtered(buf + c, len - c,
490 dmi_get_system_info(DMI_PRODUCT_NAME));
491
492 board = dmi_get_system_info(DMI_BOARD_NAME);
493 if (board) {
494 c += scnprintf(buf + c, len - c, "/");
495 c += print_filtered(buf + c, len - c, board);
496 }
497 c += scnprintf(buf + c, len - c, ", BIOS ");
498 c += print_filtered(buf + c, len - c,
499 dmi_get_system_info(DMI_BIOS_VERSION));
500 c += scnprintf(buf + c, len - c, " ");
501 c += print_filtered(buf + c, len - c,
502 dmi_get_system_info(DMI_BIOS_DATE));
503}
504
505/*
506 * Check for DMI/SMBIOS headers in the system firmware image. Any
507 * SMBIOS header must start 16 bytes before the DMI header, so take a
508 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
509 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
510 * takes precedence) and return 0. Otherwise return 1.
511 */
512static int __init dmi_present(const u8 *buf)
513{
514 u32 smbios_ver;
515
516 if (memcmp(buf, "_SM_", 4) == 0 &&
517 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
518 smbios_ver = get_unaligned_be16(buf + 6);
519 smbios_entry_point_size = buf[5];
520 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
521
522 /* Some BIOS report weird SMBIOS version, fix that up */
523 switch (smbios_ver) {
524 case 0x021F:
525 case 0x0221:
526 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
527 smbios_ver & 0xFF, 3);
528 smbios_ver = 0x0203;
529 break;
530 case 0x0233:
531 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
532 smbios_ver = 0x0206;
533 break;
534 }
535 } else {
536 smbios_ver = 0;
537 }
538
539 buf += 16;
540
541 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
542 if (smbios_ver)
543 dmi_ver = smbios_ver;
544 else
545 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
546 dmi_ver <<= 8;
547 dmi_num = get_unaligned_le16(buf + 12);
548 dmi_len = get_unaligned_le16(buf + 6);
549 dmi_base = get_unaligned_le32(buf + 8);
550
551 if (dmi_walk_early(dmi_decode) == 0) {
552 if (smbios_ver) {
553 pr_info("SMBIOS %d.%d present.\n",
554 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
555 } else {
556 smbios_entry_point_size = 15;
557 memcpy(smbios_entry_point, buf,
558 smbios_entry_point_size);
559 pr_info("Legacy DMI %d.%d present.\n",
560 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
561 }
562 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
563 printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);
564 return 0;
565 }
566 }
567
568 return 1;
569}
570
571/*
572 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
573 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
574 */
575static int __init dmi_smbios3_present(const u8 *buf)
576{
577 if (memcmp(buf, "_SM3_", 5) == 0 &&
578 buf[6] < 32 && dmi_checksum(buf, buf[6])) {
579 dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
580 dmi_num = 0; /* No longer specified */
581 dmi_len = get_unaligned_le32(buf + 12);
582 dmi_base = get_unaligned_le64(buf + 16);
583 smbios_entry_point_size = buf[6];
584 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
585
586 if (dmi_walk_early(dmi_decode) == 0) {
587 pr_info("SMBIOS %d.%d.%d present.\n",
588 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
589 dmi_ver & 0xFF);
590 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
591 pr_debug("DMI: %s\n", dmi_ids_string);
592 return 0;
593 }
594 }
595 return 1;
596}
597
598void __init dmi_scan_machine(void)
599{
600 char __iomem *p, *q;
601 char buf[32];
602
603 if (efi_enabled(EFI_CONFIG_TABLES)) {
604 /*
605 * According to the DMTF SMBIOS reference spec v3.0.0, it is
606 * allowed to define both the 64-bit entry point (smbios3) and
607 * the 32-bit entry point (smbios), in which case they should
608 * either both point to the same SMBIOS structure table, or the
609 * table pointed to by the 64-bit entry point should contain a
610 * superset of the table contents pointed to by the 32-bit entry
611 * point (section 5.2)
612 * This implies that the 64-bit entry point should have
613 * precedence if it is defined and supported by the OS. If we
614 * have the 64-bit entry point, but fail to decode it, fall
615 * back to the legacy one (if available)
616 */
617 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
618 p = dmi_early_remap(efi.smbios3, 32);
619 if (p == NULL)
620 goto error;
621 memcpy_fromio(buf, p, 32);
622 dmi_early_unmap(p, 32);
623
624 if (!dmi_smbios3_present(buf)) {
625 dmi_available = 1;
626 goto out;
627 }
628 }
629 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
630 goto error;
631
632 /* This is called as a core_initcall() because it isn't
633 * needed during early boot. This also means we can
634 * iounmap the space when we're done with it.
635 */
636 p = dmi_early_remap(efi.smbios, 32);
637 if (p == NULL)
638 goto error;
639 memcpy_fromio(buf, p, 32);
640 dmi_early_unmap(p, 32);
641
642 if (!dmi_present(buf)) {
643 dmi_available = 1;
644 goto out;
645 }
646 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
647 p = dmi_early_remap(0xF0000, 0x10000);
648 if (p == NULL)
649 goto error;
650
651 /*
652 * Iterate over all possible DMI header addresses q.
653 * Maintain the 32 bytes around q in buf. On the
654 * first iteration, substitute zero for the
655 * out-of-range bytes so there is no chance of falsely
656 * detecting an SMBIOS header.
657 */
658 memset(buf, 0, 16);
659 for (q = p; q < p + 0x10000; q += 16) {
660 memcpy_fromio(buf + 16, q, 16);
661 if (!dmi_smbios3_present(buf) || !dmi_present(buf)) {
662 dmi_available = 1;
663 dmi_early_unmap(p, 0x10000);
664 goto out;
665 }
666 memcpy(buf, buf + 16, 16);
667 }
668 dmi_early_unmap(p, 0x10000);
669 }
670 error:
671 pr_info("DMI not present or invalid.\n");
672 out:
673 dmi_initialized = 1;
674}
675
676static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
677 struct bin_attribute *attr, char *buf,
678 loff_t pos, size_t count)
679{
680 memcpy(buf, attr->private + pos, count);
681 return count;
682}
683
684static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
685static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
686
687static int __init dmi_init(void)
688{
689 struct kobject *tables_kobj;
690 u8 *dmi_table;
691 int ret = -ENOMEM;
692
693 if (!dmi_available) {
694 ret = -ENODATA;
695 goto err;
696 }
697
698 /*
699 * Set up dmi directory at /sys/firmware/dmi. This entry should stay
700 * even after farther error, as it can be used by other modules like
701 * dmi-sysfs.
702 */
703 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
704 if (!dmi_kobj)
705 goto err;
706
707 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
708 if (!tables_kobj)
709 goto err;
710
711 dmi_table = dmi_remap(dmi_base, dmi_len);
712 if (!dmi_table)
713 goto err_tables;
714
715 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
716 bin_attr_smbios_entry_point.private = smbios_entry_point;
717 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
718 if (ret)
719 goto err_unmap;
720
721 bin_attr_DMI.size = dmi_len;
722 bin_attr_DMI.private = dmi_table;
723 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
724 if (!ret)
725 return 0;
726
727 sysfs_remove_bin_file(tables_kobj,
728 &bin_attr_smbios_entry_point);
729 err_unmap:
730 dmi_unmap(dmi_table);
731 err_tables:
732 kobject_del(tables_kobj);
733 kobject_put(tables_kobj);
734 err:
735 pr_err("dmi: Firmware registration failed.\n");
736
737 return ret;
738}
739subsys_initcall(dmi_init);
740
741/**
742 * dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
743 *
744 * Invoke dump_stack_set_arch_desc() with DMI system information so that
745 * DMI identifiers are printed out on task dumps. Arch boot code should
746 * call this function after dmi_scan_machine() if it wants to print out DMI
747 * identifiers on task dumps.
748 */
749void __init dmi_set_dump_stack_arch_desc(void)
750{
751 dump_stack_set_arch_desc("%s", dmi_ids_string);
752}
753
754/**
755 * dmi_matches - check if dmi_system_id structure matches system DMI data
756 * @dmi: pointer to the dmi_system_id structure to check
757 */
758static bool dmi_matches(const struct dmi_system_id *dmi)
759{
760 int i;
761
762 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
763
764 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
765 int s = dmi->matches[i].slot;
766 if (s == DMI_NONE)
767 break;
768 if (dmi_ident[s]) {
769 if (!dmi->matches[i].exact_match &&
770 strstr(dmi_ident[s], dmi->matches[i].substr))
771 continue;
772 else if (dmi->matches[i].exact_match &&
773 !strcmp(dmi_ident[s], dmi->matches[i].substr))
774 continue;
775 }
776
777 /* No match */
778 return false;
779 }
780 return true;
781}
782
783/**
784 * dmi_is_end_of_table - check for end-of-table marker
785 * @dmi: pointer to the dmi_system_id structure to check
786 */
787static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
788{
789 return dmi->matches[0].slot == DMI_NONE;
790}
791
792/**
793 * dmi_check_system - check system DMI data
794 * @list: array of dmi_system_id structures to match against
795 * All non-null elements of the list must match
796 * their slot's (field index's) data (i.e., each
797 * list string must be a substring of the specified
798 * DMI slot's string data) to be considered a
799 * successful match.
800 *
801 * Walk the blacklist table running matching functions until someone
802 * returns non zero or we hit the end. Callback function is called for
803 * each successful match. Returns the number of matches.
804 */
805int dmi_check_system(const struct dmi_system_id *list)
806{
807 int count = 0;
808 const struct dmi_system_id *d;
809
810 for (d = list; !dmi_is_end_of_table(d); d++)
811 if (dmi_matches(d)) {
812 count++;
813 if (d->callback && d->callback(d))
814 break;
815 }
816
817 return count;
818}
819EXPORT_SYMBOL(dmi_check_system);
820
821/**
822 * dmi_first_match - find dmi_system_id structure matching system DMI data
823 * @list: array of dmi_system_id structures to match against
824 * All non-null elements of the list must match
825 * their slot's (field index's) data (i.e., each
826 * list string must be a substring of the specified
827 * DMI slot's string data) to be considered a
828 * successful match.
829 *
830 * Walk the blacklist table until the first match is found. Return the
831 * pointer to the matching entry or NULL if there's no match.
832 */
833const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
834{
835 const struct dmi_system_id *d;
836
837 for (d = list; !dmi_is_end_of_table(d); d++)
838 if (dmi_matches(d))
839 return d;
840
841 return NULL;
842}
843EXPORT_SYMBOL(dmi_first_match);
844
845/**
846 * dmi_get_system_info - return DMI data value
847 * @field: data index (see enum dmi_field)
848 *
849 * Returns one DMI data value, can be used to perform
850 * complex DMI data checks.
851 */
852const char *dmi_get_system_info(int field)
853{
854 return dmi_ident[field];
855}
856EXPORT_SYMBOL(dmi_get_system_info);
857
858/**
859 * dmi_name_in_serial - Check if string is in the DMI product serial information
860 * @str: string to check for
861 */
862int dmi_name_in_serial(const char *str)
863{
864 int f = DMI_PRODUCT_SERIAL;
865 if (dmi_ident[f] && strstr(dmi_ident[f], str))
866 return 1;
867 return 0;
868}
869
870/**
871 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
872 * @str: Case sensitive Name
873 */
874int dmi_name_in_vendors(const char *str)
875{
876 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
877 int i;
878 for (i = 0; fields[i] != DMI_NONE; i++) {
879 int f = fields[i];
880 if (dmi_ident[f] && strstr(dmi_ident[f], str))
881 return 1;
882 }
883 return 0;
884}
885EXPORT_SYMBOL(dmi_name_in_vendors);
886
887/**
888 * dmi_find_device - find onboard device by type/name
889 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
890 * @name: device name string or %NULL to match all
891 * @from: previous device found in search, or %NULL for new search.
892 *
893 * Iterates through the list of known onboard devices. If a device is
894 * found with a matching @type and @name, a pointer to its device
895 * structure is returned. Otherwise, %NULL is returned.
896 * A new search is initiated by passing %NULL as the @from argument.
897 * If @from is not %NULL, searches continue from next device.
898 */
899const struct dmi_device *dmi_find_device(int type, const char *name,
900 const struct dmi_device *from)
901{
902 const struct list_head *head = from ? &from->list : &dmi_devices;
903 struct list_head *d;
904
905 for (d = head->next; d != &dmi_devices; d = d->next) {
906 const struct dmi_device *dev =
907 list_entry(d, struct dmi_device, list);
908
909 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
910 ((name == NULL) || (strcmp(dev->name, name) == 0)))
911 return dev;
912 }
913
914 return NULL;
915}
916EXPORT_SYMBOL(dmi_find_device);
917
918/**
919 * dmi_get_date - parse a DMI date
920 * @field: data index (see enum dmi_field)
921 * @yearp: optional out parameter for the year
922 * @monthp: optional out parameter for the month
923 * @dayp: optional out parameter for the day
924 *
925 * The date field is assumed to be in the form resembling
926 * [mm[/dd]]/yy[yy] and the result is stored in the out
927 * parameters any or all of which can be omitted.
928 *
929 * If the field doesn't exist, all out parameters are set to zero
930 * and false is returned. Otherwise, true is returned with any
931 * invalid part of date set to zero.
932 *
933 * On return, year, month and day are guaranteed to be in the
934 * range of [0,9999], [0,12] and [0,31] respectively.
935 */
936bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
937{
938 int year = 0, month = 0, day = 0;
939 bool exists;
940 const char *s, *y;
941 char *e;
942
943 s = dmi_get_system_info(field);
944 exists = s;
945 if (!exists)
946 goto out;
947
948 /*
949 * Determine year first. We assume the date string resembles
950 * mm/dd/yy[yy] but the original code extracted only the year
951 * from the end. Keep the behavior in the spirit of no
952 * surprises.
953 */
954 y = strrchr(s, '/');
955 if (!y)
956 goto out;
957
958 y++;
959 year = simple_strtoul(y, &e, 10);
960 if (y != e && year < 100) { /* 2-digit year */
961 year += 1900;
962 if (year < 1996) /* no dates < spec 1.0 */
963 year += 100;
964 }
965 if (year > 9999) /* year should fit in %04d */
966 year = 0;
967
968 /* parse the mm and dd */
969 month = simple_strtoul(s, &e, 10);
970 if (s == e || *e != '/' || !month || month > 12) {
971 month = 0;
972 goto out;
973 }
974
975 s = e + 1;
976 day = simple_strtoul(s, &e, 10);
977 if (s == y || s == e || *e != '/' || day > 31)
978 day = 0;
979out:
980 if (yearp)
981 *yearp = year;
982 if (monthp)
983 *monthp = month;
984 if (dayp)
985 *dayp = day;
986 return exists;
987}
988EXPORT_SYMBOL(dmi_get_date);
989
990/**
991 * dmi_walk - Walk the DMI table and get called back for every record
992 * @decode: Callback function
993 * @private_data: Private data to be passed to the callback function
994 *
995 * Returns -1 when the DMI table can't be reached, 0 on success.
996 */
997int dmi_walk(void (*decode)(const struct dmi_header *, void *),
998 void *private_data)
999{
1000 u8 *buf;
1001
1002 if (!dmi_available)
1003 return -1;
1004
1005 buf = dmi_remap(dmi_base, dmi_len);
1006 if (buf == NULL)
1007 return -1;
1008
1009 dmi_decode_table(buf, decode, private_data);
1010
1011 dmi_unmap(buf);
1012 return 0;
1013}
1014EXPORT_SYMBOL_GPL(dmi_walk);
1015
1016/**
1017 * dmi_match - compare a string to the dmi field (if exists)
1018 * @f: DMI field identifier
1019 * @str: string to compare the DMI field to
1020 *
1021 * Returns true if the requested field equals to the str (including NULL).
1022 */
1023bool dmi_match(enum dmi_field f, const char *str)
1024{
1025 const char *info = dmi_get_system_info(f);
1026
1027 if (info == NULL || str == NULL)
1028 return info == str;
1029
1030 return !strcmp(info, str);
1031}
1032EXPORT_SYMBOL_GPL(dmi_match);
1033
1034void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1035{
1036 int n;
1037
1038 if (dmi_memdev == NULL)
1039 return;
1040
1041 for (n = 0; n < dmi_memdev_nr; n++) {
1042 if (handle == dmi_memdev[n].handle) {
1043 *bank = dmi_memdev[n].bank;
1044 *device = dmi_memdev[n].device;
1045 break;
1046 }
1047 }
1048}
1049EXPORT_SYMBOL_GPL(dmi_memdev_name);
1// SPDX-License-Identifier: GPL-2.0-only
2#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 <asm/unaligned.h>
13
14struct kobject *dmi_kobj;
15EXPORT_SYMBOL_GPL(dmi_kobj);
16
17/*
18 * DMI stands for "Desktop Management Interface". It is part
19 * of and an antecedent to, SMBIOS, which stands for System
20 * Management BIOS. See further: http://www.dmtf.org/standards
21 */
22static const char dmi_empty_string[] = "";
23
24static u32 dmi_ver __initdata;
25static u32 dmi_len;
26static u16 dmi_num;
27static u8 smbios_entry_point[32];
28static int smbios_entry_point_size;
29
30/* DMI system identification string used during boot */
31static char dmi_ids_string[128] __initdata;
32
33static struct dmi_memdev_info {
34 const char *device;
35 const char *bank;
36 u64 size; /* bytes */
37 u16 handle;
38} *dmi_memdev;
39static int dmi_memdev_nr;
40
41static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
42{
43 const u8 *bp = ((u8 *) dm) + dm->length;
44 const u8 *nsp;
45
46 if (s) {
47 while (--s > 0 && *bp)
48 bp += strlen(bp) + 1;
49
50 /* Strings containing only spaces are considered empty */
51 nsp = bp;
52 while (*nsp == ' ')
53 nsp++;
54 if (*nsp != '\0')
55 return bp;
56 }
57
58 return dmi_empty_string;
59}
60
61static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
62{
63 const char *bp = dmi_string_nosave(dm, s);
64 char *str;
65 size_t len;
66
67 if (bp == dmi_empty_string)
68 return dmi_empty_string;
69
70 len = strlen(bp) + 1;
71 str = dmi_alloc(len);
72 if (str != NULL)
73 strcpy(str, bp);
74
75 return str;
76}
77
78/*
79 * We have to be cautious here. We have seen BIOSes with DMI pointers
80 * pointing to completely the wrong place for example
81 */
82static void dmi_decode_table(u8 *buf,
83 void (*decode)(const struct dmi_header *, void *),
84 void *private_data)
85{
86 u8 *data = buf;
87 int i = 0;
88
89 /*
90 * Stop when we have seen all the items the table claimed to have
91 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
92 * >= 3.0 only) OR we run off the end of the table (should never
93 * happen but sometimes does on bogus implementations.)
94 */
95 while ((!dmi_num || i < dmi_num) &&
96 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
97 const struct dmi_header *dm = (const struct dmi_header *)data;
98
99 /*
100 * We want to know the total length (formatted area and
101 * strings) before decoding to make sure we won't run off the
102 * table in dmi_decode or dmi_string
103 */
104 data += dm->length;
105 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
106 data++;
107 if (data - buf < dmi_len - 1)
108 decode(dm, private_data);
109
110 data += 2;
111 i++;
112
113 /*
114 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
115 * For tables behind a 64-bit entry point, we have no item
116 * count and no exact table length, so stop on end-of-table
117 * marker. For tables behind a 32-bit entry point, we have
118 * seen OEM structures behind the end-of-table marker on
119 * some systems, so don't trust it.
120 */
121 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
122 break;
123 }
124
125 /* Trim DMI table length if needed */
126 if (dmi_len > data - buf)
127 dmi_len = data - buf;
128}
129
130static phys_addr_t dmi_base;
131
132static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
133 void *))
134{
135 u8 *buf;
136 u32 orig_dmi_len = dmi_len;
137
138 buf = dmi_early_remap(dmi_base, orig_dmi_len);
139 if (buf == NULL)
140 return -ENOMEM;
141
142 dmi_decode_table(buf, decode, NULL);
143
144 add_device_randomness(buf, dmi_len);
145
146 dmi_early_unmap(buf, orig_dmi_len);
147 return 0;
148}
149
150static int __init dmi_checksum(const u8 *buf, u8 len)
151{
152 u8 sum = 0;
153 int a;
154
155 for (a = 0; a < len; a++)
156 sum += buf[a];
157
158 return sum == 0;
159}
160
161static const char *dmi_ident[DMI_STRING_MAX];
162static LIST_HEAD(dmi_devices);
163int dmi_available;
164
165/*
166 * Save a DMI string
167 */
168static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
169 int string)
170{
171 const char *d = (const char *) dm;
172 const char *p;
173
174 if (dmi_ident[slot] || dm->length <= string)
175 return;
176
177 p = dmi_string(dm, d[string]);
178 if (p == NULL)
179 return;
180
181 dmi_ident[slot] = p;
182}
183
184static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
185 int index)
186{
187 const u8 *d;
188 char *s;
189 int is_ff = 1, is_00 = 1, i;
190
191 if (dmi_ident[slot] || dm->length < index + 16)
192 return;
193
194 d = (u8 *) dm + index;
195 for (i = 0; i < 16 && (is_ff || is_00); i++) {
196 if (d[i] != 0x00)
197 is_00 = 0;
198 if (d[i] != 0xFF)
199 is_ff = 0;
200 }
201
202 if (is_ff || is_00)
203 return;
204
205 s = dmi_alloc(16*2+4+1);
206 if (!s)
207 return;
208
209 /*
210 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
211 * the UUID are supposed to be little-endian encoded. The specification
212 * says that this is the defacto standard.
213 */
214 if (dmi_ver >= 0x020600)
215 sprintf(s, "%pUl", d);
216 else
217 sprintf(s, "%pUb", d);
218
219 dmi_ident[slot] = s;
220}
221
222static void __init dmi_save_type(const struct dmi_header *dm, int slot,
223 int index)
224{
225 const u8 *d;
226 char *s;
227
228 if (dmi_ident[slot] || dm->length <= index)
229 return;
230
231 s = dmi_alloc(4);
232 if (!s)
233 return;
234
235 d = (u8 *) dm + index;
236 sprintf(s, "%u", *d & 0x7F);
237 dmi_ident[slot] = s;
238}
239
240static void __init dmi_save_one_device(int type, const char *name)
241{
242 struct dmi_device *dev;
243
244 /* No duplicate device */
245 if (dmi_find_device(type, name, NULL))
246 return;
247
248 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
249 if (!dev)
250 return;
251
252 dev->type = type;
253 strcpy((char *)(dev + 1), name);
254 dev->name = (char *)(dev + 1);
255 dev->device_data = NULL;
256 list_add(&dev->list, &dmi_devices);
257}
258
259static void __init dmi_save_devices(const struct dmi_header *dm)
260{
261 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
262
263 for (i = 0; i < count; i++) {
264 const char *d = (char *)(dm + 1) + (i * 2);
265
266 /* Skip disabled device */
267 if ((*d & 0x80) == 0)
268 continue;
269
270 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
271 }
272}
273
274static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
275{
276 int i, count;
277 struct dmi_device *dev;
278
279 if (dm->length < 0x05)
280 return;
281
282 count = *(u8 *)(dm + 1);
283 for (i = 1; i <= count; i++) {
284 const char *devname = dmi_string(dm, i);
285
286 if (devname == dmi_empty_string)
287 continue;
288
289 dev = dmi_alloc(sizeof(*dev));
290 if (!dev)
291 break;
292
293 dev->type = DMI_DEV_TYPE_OEM_STRING;
294 dev->name = devname;
295 dev->device_data = NULL;
296
297 list_add(&dev->list, &dmi_devices);
298 }
299}
300
301static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
302{
303 struct dmi_device *dev;
304 void *data;
305
306 data = dmi_alloc(dm->length);
307 if (data == NULL)
308 return;
309
310 memcpy(data, dm, dm->length);
311
312 dev = dmi_alloc(sizeof(*dev));
313 if (!dev)
314 return;
315
316 dev->type = DMI_DEV_TYPE_IPMI;
317 dev->name = "IPMI controller";
318 dev->device_data = data;
319
320 list_add_tail(&dev->list, &dmi_devices);
321}
322
323static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
324 int devfn, const char *name, int type)
325{
326 struct dmi_dev_onboard *dev;
327
328 /* Ignore invalid values */
329 if (type == DMI_DEV_TYPE_DEV_SLOT &&
330 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
331 return;
332
333 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
334 if (!dev)
335 return;
336
337 dev->instance = instance;
338 dev->segment = segment;
339 dev->bus = bus;
340 dev->devfn = devfn;
341
342 strcpy((char *)&dev[1], name);
343 dev->dev.type = type;
344 dev->dev.name = (char *)&dev[1];
345 dev->dev.device_data = dev;
346
347 list_add(&dev->dev.list, &dmi_devices);
348}
349
350static void __init dmi_save_extended_devices(const struct dmi_header *dm)
351{
352 const char *name;
353 const u8 *d = (u8 *)dm;
354
355 if (dm->length < 0x0B)
356 return;
357
358 /* Skip disabled device */
359 if ((d[0x5] & 0x80) == 0)
360 return;
361
362 name = dmi_string_nosave(dm, d[0x4]);
363 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
364 DMI_DEV_TYPE_DEV_ONBOARD);
365 dmi_save_one_device(d[0x5] & 0x7f, name);
366}
367
368static void __init dmi_save_system_slot(const struct dmi_header *dm)
369{
370 const u8 *d = (u8 *)dm;
371
372 /* Need SMBIOS 2.6+ structure */
373 if (dm->length < 0x11)
374 return;
375 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
376 d[0x10], dmi_string_nosave(dm, d[0x4]),
377 DMI_DEV_TYPE_DEV_SLOT);
378}
379
380static void __init count_mem_devices(const struct dmi_header *dm, void *v)
381{
382 if (dm->type != DMI_ENTRY_MEM_DEVICE)
383 return;
384 dmi_memdev_nr++;
385}
386
387static void __init save_mem_devices(const struct dmi_header *dm, void *v)
388{
389 const char *d = (const char *)dm;
390 static int nr;
391 u64 bytes;
392 u16 size;
393
394 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12)
395 return;
396 if (nr >= dmi_memdev_nr) {
397 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
398 return;
399 }
400 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
401 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
402 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
403
404 size = get_unaligned((u16 *)&d[0xC]);
405 if (size == 0)
406 bytes = 0;
407 else if (size == 0xffff)
408 bytes = ~0ull;
409 else if (size & 0x8000)
410 bytes = (u64)(size & 0x7fff) << 10;
411 else if (size != 0x7fff || dm->length < 0x20)
412 bytes = (u64)size << 20;
413 else
414 bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
415
416 dmi_memdev[nr].size = bytes;
417 nr++;
418}
419
420static void __init dmi_memdev_walk(void)
421{
422 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
423 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
424 if (dmi_memdev)
425 dmi_walk_early(save_mem_devices);
426 }
427}
428
429/*
430 * Process a DMI table entry. Right now all we care about are the BIOS
431 * and machine entries. For 2.5 we should pull the smbus controller info
432 * out of here.
433 */
434static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
435{
436 switch (dm->type) {
437 case 0: /* BIOS Information */
438 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
439 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
440 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
441 break;
442 case 1: /* System Information */
443 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
444 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
445 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
446 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
447 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
448 dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);
449 dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
450 break;
451 case 2: /* Base Board Information */
452 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
453 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
454 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
455 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
456 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
457 break;
458 case 3: /* Chassis Information */
459 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
460 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
461 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
462 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
463 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
464 break;
465 case 9: /* System Slots */
466 dmi_save_system_slot(dm);
467 break;
468 case 10: /* Onboard Devices Information */
469 dmi_save_devices(dm);
470 break;
471 case 11: /* OEM Strings */
472 dmi_save_oem_strings_devices(dm);
473 break;
474 case 38: /* IPMI Device Information */
475 dmi_save_ipmi_device(dm);
476 break;
477 case 41: /* Onboard Devices Extended Information */
478 dmi_save_extended_devices(dm);
479 }
480}
481
482static int __init print_filtered(char *buf, size_t len, const char *info)
483{
484 int c = 0;
485 const char *p;
486
487 if (!info)
488 return c;
489
490 for (p = info; *p; p++)
491 if (isprint(*p))
492 c += scnprintf(buf + c, len - c, "%c", *p);
493 else
494 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
495 return c;
496}
497
498static void __init dmi_format_ids(char *buf, size_t len)
499{
500 int c = 0;
501 const char *board; /* Board Name is optional */
502
503 c += print_filtered(buf + c, len - c,
504 dmi_get_system_info(DMI_SYS_VENDOR));
505 c += scnprintf(buf + c, len - c, " ");
506 c += print_filtered(buf + c, len - c,
507 dmi_get_system_info(DMI_PRODUCT_NAME));
508
509 board = dmi_get_system_info(DMI_BOARD_NAME);
510 if (board) {
511 c += scnprintf(buf + c, len - c, "/");
512 c += print_filtered(buf + c, len - c, board);
513 }
514 c += scnprintf(buf + c, len - c, ", BIOS ");
515 c += print_filtered(buf + c, len - c,
516 dmi_get_system_info(DMI_BIOS_VERSION));
517 c += scnprintf(buf + c, len - c, " ");
518 c += print_filtered(buf + c, len - c,
519 dmi_get_system_info(DMI_BIOS_DATE));
520}
521
522/*
523 * Check for DMI/SMBIOS headers in the system firmware image. Any
524 * SMBIOS header must start 16 bytes before the DMI header, so take a
525 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
526 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
527 * takes precedence) and return 0. Otherwise return 1.
528 */
529static int __init dmi_present(const u8 *buf)
530{
531 u32 smbios_ver;
532
533 if (memcmp(buf, "_SM_", 4) == 0 &&
534 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
535 smbios_ver = get_unaligned_be16(buf + 6);
536 smbios_entry_point_size = buf[5];
537 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
538
539 /* Some BIOS report weird SMBIOS version, fix that up */
540 switch (smbios_ver) {
541 case 0x021F:
542 case 0x0221:
543 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
544 smbios_ver & 0xFF, 3);
545 smbios_ver = 0x0203;
546 break;
547 case 0x0233:
548 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
549 smbios_ver = 0x0206;
550 break;
551 }
552 } else {
553 smbios_ver = 0;
554 }
555
556 buf += 16;
557
558 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
559 if (smbios_ver)
560 dmi_ver = smbios_ver;
561 else
562 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
563 dmi_ver <<= 8;
564 dmi_num = get_unaligned_le16(buf + 12);
565 dmi_len = get_unaligned_le16(buf + 6);
566 dmi_base = get_unaligned_le32(buf + 8);
567
568 if (dmi_walk_early(dmi_decode) == 0) {
569 if (smbios_ver) {
570 pr_info("SMBIOS %d.%d present.\n",
571 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
572 } else {
573 smbios_entry_point_size = 15;
574 memcpy(smbios_entry_point, buf,
575 smbios_entry_point_size);
576 pr_info("Legacy DMI %d.%d present.\n",
577 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
578 }
579 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
580 pr_info("DMI: %s\n", dmi_ids_string);
581 return 0;
582 }
583 }
584
585 return 1;
586}
587
588/*
589 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
590 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
591 */
592static int __init dmi_smbios3_present(const u8 *buf)
593{
594 if (memcmp(buf, "_SM3_", 5) == 0 &&
595 buf[6] < 32 && dmi_checksum(buf, buf[6])) {
596 dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
597 dmi_num = 0; /* No longer specified */
598 dmi_len = get_unaligned_le32(buf + 12);
599 dmi_base = get_unaligned_le64(buf + 16);
600 smbios_entry_point_size = buf[6];
601 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
602
603 if (dmi_walk_early(dmi_decode) == 0) {
604 pr_info("SMBIOS %d.%d.%d present.\n",
605 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
606 dmi_ver & 0xFF);
607 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
608 pr_info("DMI: %s\n", dmi_ids_string);
609 return 0;
610 }
611 }
612 return 1;
613}
614
615static void __init dmi_scan_machine(void)
616{
617 char __iomem *p, *q;
618 char buf[32];
619
620 if (efi_enabled(EFI_CONFIG_TABLES)) {
621 /*
622 * According to the DMTF SMBIOS reference spec v3.0.0, it is
623 * allowed to define both the 64-bit entry point (smbios3) and
624 * the 32-bit entry point (smbios), in which case they should
625 * either both point to the same SMBIOS structure table, or the
626 * table pointed to by the 64-bit entry point should contain a
627 * superset of the table contents pointed to by the 32-bit entry
628 * point (section 5.2)
629 * This implies that the 64-bit entry point should have
630 * precedence if it is defined and supported by the OS. If we
631 * have the 64-bit entry point, but fail to decode it, fall
632 * back to the legacy one (if available)
633 */
634 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
635 p = dmi_early_remap(efi.smbios3, 32);
636 if (p == NULL)
637 goto error;
638 memcpy_fromio(buf, p, 32);
639 dmi_early_unmap(p, 32);
640
641 if (!dmi_smbios3_present(buf)) {
642 dmi_available = 1;
643 return;
644 }
645 }
646 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
647 goto error;
648
649 /* This is called as a core_initcall() because it isn't
650 * needed during early boot. This also means we can
651 * iounmap the space when we're done with it.
652 */
653 p = dmi_early_remap(efi.smbios, 32);
654 if (p == NULL)
655 goto error;
656 memcpy_fromio(buf, p, 32);
657 dmi_early_unmap(p, 32);
658
659 if (!dmi_present(buf)) {
660 dmi_available = 1;
661 return;
662 }
663 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
664 p = dmi_early_remap(0xF0000, 0x10000);
665 if (p == NULL)
666 goto error;
667
668 /*
669 * Same logic as above, look for a 64-bit entry point
670 * first, and if not found, fall back to 32-bit entry point.
671 */
672 memcpy_fromio(buf, p, 16);
673 for (q = p + 16; q < p + 0x10000; q += 16) {
674 memcpy_fromio(buf + 16, q, 16);
675 if (!dmi_smbios3_present(buf)) {
676 dmi_available = 1;
677 dmi_early_unmap(p, 0x10000);
678 return;
679 }
680 memcpy(buf, buf + 16, 16);
681 }
682
683 /*
684 * Iterate over all possible DMI header addresses q.
685 * Maintain the 32 bytes around q in buf. On the
686 * first iteration, substitute zero for the
687 * out-of-range bytes so there is no chance of falsely
688 * detecting an SMBIOS header.
689 */
690 memset(buf, 0, 16);
691 for (q = p; q < p + 0x10000; q += 16) {
692 memcpy_fromio(buf + 16, q, 16);
693 if (!dmi_present(buf)) {
694 dmi_available = 1;
695 dmi_early_unmap(p, 0x10000);
696 return;
697 }
698 memcpy(buf, buf + 16, 16);
699 }
700 dmi_early_unmap(p, 0x10000);
701 }
702 error:
703 pr_info("DMI not present or invalid.\n");
704}
705
706static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
707 struct bin_attribute *attr, char *buf,
708 loff_t pos, size_t count)
709{
710 memcpy(buf, attr->private + pos, count);
711 return count;
712}
713
714static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
715static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
716
717static int __init dmi_init(void)
718{
719 struct kobject *tables_kobj;
720 u8 *dmi_table;
721 int ret = -ENOMEM;
722
723 if (!dmi_available)
724 return 0;
725
726 /*
727 * Set up dmi directory at /sys/firmware/dmi. This entry should stay
728 * even after farther error, as it can be used by other modules like
729 * dmi-sysfs.
730 */
731 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
732 if (!dmi_kobj)
733 goto err;
734
735 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
736 if (!tables_kobj)
737 goto err;
738
739 dmi_table = dmi_remap(dmi_base, dmi_len);
740 if (!dmi_table)
741 goto err_tables;
742
743 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
744 bin_attr_smbios_entry_point.private = smbios_entry_point;
745 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
746 if (ret)
747 goto err_unmap;
748
749 bin_attr_DMI.size = dmi_len;
750 bin_attr_DMI.private = dmi_table;
751 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
752 if (!ret)
753 return 0;
754
755 sysfs_remove_bin_file(tables_kobj,
756 &bin_attr_smbios_entry_point);
757 err_unmap:
758 dmi_unmap(dmi_table);
759 err_tables:
760 kobject_del(tables_kobj);
761 kobject_put(tables_kobj);
762 err:
763 pr_err("dmi: Firmware registration failed.\n");
764
765 return ret;
766}
767subsys_initcall(dmi_init);
768
769/**
770 * dmi_setup - scan and setup DMI system information
771 *
772 * Scan the DMI system information. This setups DMI identifiers
773 * (dmi_system_id) for printing it out on task dumps and prepares
774 * DIMM entry information (dmi_memdev_info) from the SMBIOS table
775 * for using this when reporting memory errors.
776 */
777void __init dmi_setup(void)
778{
779 dmi_scan_machine();
780 if (!dmi_available)
781 return;
782
783 dmi_memdev_walk();
784 dump_stack_set_arch_desc("%s", dmi_ids_string);
785}
786
787/**
788 * dmi_matches - check if dmi_system_id structure matches system DMI data
789 * @dmi: pointer to the dmi_system_id structure to check
790 */
791static bool dmi_matches(const struct dmi_system_id *dmi)
792{
793 int i;
794
795 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
796 int s = dmi->matches[i].slot;
797 if (s == DMI_NONE)
798 break;
799 if (s == DMI_OEM_STRING) {
800 /* DMI_OEM_STRING must be exact match */
801 const struct dmi_device *valid;
802
803 valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,
804 dmi->matches[i].substr, NULL);
805 if (valid)
806 continue;
807 } else if (dmi_ident[s]) {
808 if (dmi->matches[i].exact_match) {
809 if (!strcmp(dmi_ident[s],
810 dmi->matches[i].substr))
811 continue;
812 } else {
813 if (strstr(dmi_ident[s],
814 dmi->matches[i].substr))
815 continue;
816 }
817 }
818
819 /* No match */
820 return false;
821 }
822 return true;
823}
824
825/**
826 * dmi_is_end_of_table - check for end-of-table marker
827 * @dmi: pointer to the dmi_system_id structure to check
828 */
829static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
830{
831 return dmi->matches[0].slot == DMI_NONE;
832}
833
834/**
835 * dmi_check_system - check system DMI data
836 * @list: array of dmi_system_id structures to match against
837 * All non-null elements of the list must match
838 * their slot's (field index's) data (i.e., each
839 * list string must be a substring of the specified
840 * DMI slot's string data) to be considered a
841 * successful match.
842 *
843 * Walk the blacklist table running matching functions until someone
844 * returns non zero or we hit the end. Callback function is called for
845 * each successful match. Returns the number of matches.
846 *
847 * dmi_setup must be called before this function is called.
848 */
849int dmi_check_system(const struct dmi_system_id *list)
850{
851 int count = 0;
852 const struct dmi_system_id *d;
853
854 for (d = list; !dmi_is_end_of_table(d); d++)
855 if (dmi_matches(d)) {
856 count++;
857 if (d->callback && d->callback(d))
858 break;
859 }
860
861 return count;
862}
863EXPORT_SYMBOL(dmi_check_system);
864
865/**
866 * dmi_first_match - find dmi_system_id structure matching system DMI data
867 * @list: array of dmi_system_id structures to match against
868 * All non-null elements of the list must match
869 * their slot's (field index's) data (i.e., each
870 * list string must be a substring of the specified
871 * DMI slot's string data) to be considered a
872 * successful match.
873 *
874 * Walk the blacklist table until the first match is found. Return the
875 * pointer to the matching entry or NULL if there's no match.
876 *
877 * dmi_setup must be called before this function is called.
878 */
879const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
880{
881 const struct dmi_system_id *d;
882
883 for (d = list; !dmi_is_end_of_table(d); d++)
884 if (dmi_matches(d))
885 return d;
886
887 return NULL;
888}
889EXPORT_SYMBOL(dmi_first_match);
890
891/**
892 * dmi_get_system_info - return DMI data value
893 * @field: data index (see enum dmi_field)
894 *
895 * Returns one DMI data value, can be used to perform
896 * complex DMI data checks.
897 */
898const char *dmi_get_system_info(int field)
899{
900 return dmi_ident[field];
901}
902EXPORT_SYMBOL(dmi_get_system_info);
903
904/**
905 * dmi_name_in_serial - Check if string is in the DMI product serial information
906 * @str: string to check for
907 */
908int dmi_name_in_serial(const char *str)
909{
910 int f = DMI_PRODUCT_SERIAL;
911 if (dmi_ident[f] && strstr(dmi_ident[f], str))
912 return 1;
913 return 0;
914}
915
916/**
917 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
918 * @str: Case sensitive Name
919 */
920int dmi_name_in_vendors(const char *str)
921{
922 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
923 int i;
924 for (i = 0; fields[i] != DMI_NONE; i++) {
925 int f = fields[i];
926 if (dmi_ident[f] && strstr(dmi_ident[f], str))
927 return 1;
928 }
929 return 0;
930}
931EXPORT_SYMBOL(dmi_name_in_vendors);
932
933/**
934 * dmi_find_device - find onboard device by type/name
935 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
936 * @name: device name string or %NULL to match all
937 * @from: previous device found in search, or %NULL for new search.
938 *
939 * Iterates through the list of known onboard devices. If a device is
940 * found with a matching @type and @name, a pointer to its device
941 * structure is returned. Otherwise, %NULL is returned.
942 * A new search is initiated by passing %NULL as the @from argument.
943 * If @from is not %NULL, searches continue from next device.
944 */
945const struct dmi_device *dmi_find_device(int type, const char *name,
946 const struct dmi_device *from)
947{
948 const struct list_head *head = from ? &from->list : &dmi_devices;
949 struct list_head *d;
950
951 for (d = head->next; d != &dmi_devices; d = d->next) {
952 const struct dmi_device *dev =
953 list_entry(d, struct dmi_device, list);
954
955 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
956 ((name == NULL) || (strcmp(dev->name, name) == 0)))
957 return dev;
958 }
959
960 return NULL;
961}
962EXPORT_SYMBOL(dmi_find_device);
963
964/**
965 * dmi_get_date - parse a DMI date
966 * @field: data index (see enum dmi_field)
967 * @yearp: optional out parameter for the year
968 * @monthp: optional out parameter for the month
969 * @dayp: optional out parameter for the day
970 *
971 * The date field is assumed to be in the form resembling
972 * [mm[/dd]]/yy[yy] and the result is stored in the out
973 * parameters any or all of which can be omitted.
974 *
975 * If the field doesn't exist, all out parameters are set to zero
976 * and false is returned. Otherwise, true is returned with any
977 * invalid part of date set to zero.
978 *
979 * On return, year, month and day are guaranteed to be in the
980 * range of [0,9999], [0,12] and [0,31] respectively.
981 */
982bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
983{
984 int year = 0, month = 0, day = 0;
985 bool exists;
986 const char *s, *y;
987 char *e;
988
989 s = dmi_get_system_info(field);
990 exists = s;
991 if (!exists)
992 goto out;
993
994 /*
995 * Determine year first. We assume the date string resembles
996 * mm/dd/yy[yy] but the original code extracted only the year
997 * from the end. Keep the behavior in the spirit of no
998 * surprises.
999 */
1000 y = strrchr(s, '/');
1001 if (!y)
1002 goto out;
1003
1004 y++;
1005 year = simple_strtoul(y, &e, 10);
1006 if (y != e && year < 100) { /* 2-digit year */
1007 year += 1900;
1008 if (year < 1996) /* no dates < spec 1.0 */
1009 year += 100;
1010 }
1011 if (year > 9999) /* year should fit in %04d */
1012 year = 0;
1013
1014 /* parse the mm and dd */
1015 month = simple_strtoul(s, &e, 10);
1016 if (s == e || *e != '/' || !month || month > 12) {
1017 month = 0;
1018 goto out;
1019 }
1020
1021 s = e + 1;
1022 day = simple_strtoul(s, &e, 10);
1023 if (s == y || s == e || *e != '/' || day > 31)
1024 day = 0;
1025out:
1026 if (yearp)
1027 *yearp = year;
1028 if (monthp)
1029 *monthp = month;
1030 if (dayp)
1031 *dayp = day;
1032 return exists;
1033}
1034EXPORT_SYMBOL(dmi_get_date);
1035
1036/**
1037 * dmi_get_bios_year - get a year out of DMI_BIOS_DATE field
1038 *
1039 * Returns year on success, -ENXIO if DMI is not selected,
1040 * or a different negative error code if DMI field is not present
1041 * or not parseable.
1042 */
1043int dmi_get_bios_year(void)
1044{
1045 bool exists;
1046 int year;
1047
1048 exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
1049 if (!exists)
1050 return -ENODATA;
1051
1052 return year ? year : -ERANGE;
1053}
1054EXPORT_SYMBOL(dmi_get_bios_year);
1055
1056/**
1057 * dmi_walk - Walk the DMI table and get called back for every record
1058 * @decode: Callback function
1059 * @private_data: Private data to be passed to the callback function
1060 *
1061 * Returns 0 on success, -ENXIO if DMI is not selected or not present,
1062 * or a different negative error code if DMI walking fails.
1063 */
1064int dmi_walk(void (*decode)(const struct dmi_header *, void *),
1065 void *private_data)
1066{
1067 u8 *buf;
1068
1069 if (!dmi_available)
1070 return -ENXIO;
1071
1072 buf = dmi_remap(dmi_base, dmi_len);
1073 if (buf == NULL)
1074 return -ENOMEM;
1075
1076 dmi_decode_table(buf, decode, private_data);
1077
1078 dmi_unmap(buf);
1079 return 0;
1080}
1081EXPORT_SYMBOL_GPL(dmi_walk);
1082
1083/**
1084 * dmi_match - compare a string to the dmi field (if exists)
1085 * @f: DMI field identifier
1086 * @str: string to compare the DMI field to
1087 *
1088 * Returns true if the requested field equals to the str (including NULL).
1089 */
1090bool dmi_match(enum dmi_field f, const char *str)
1091{
1092 const char *info = dmi_get_system_info(f);
1093
1094 if (info == NULL || str == NULL)
1095 return info == str;
1096
1097 return !strcmp(info, str);
1098}
1099EXPORT_SYMBOL_GPL(dmi_match);
1100
1101void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1102{
1103 int n;
1104
1105 if (dmi_memdev == NULL)
1106 return;
1107
1108 for (n = 0; n < dmi_memdev_nr; n++) {
1109 if (handle == dmi_memdev[n].handle) {
1110 *bank = dmi_memdev[n].bank;
1111 *device = dmi_memdev[n].device;
1112 break;
1113 }
1114 }
1115}
1116EXPORT_SYMBOL_GPL(dmi_memdev_name);
1117
1118u64 dmi_memdev_size(u16 handle)
1119{
1120 int n;
1121
1122 if (dmi_memdev) {
1123 for (n = 0; n < dmi_memdev_nr; n++) {
1124 if (handle == dmi_memdev[n].handle)
1125 return dmi_memdev[n].size;
1126 }
1127 }
1128 return ~0ull;
1129}
1130EXPORT_SYMBOL_GPL(dmi_memdev_size);