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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/firmware/dmi_scan.c
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>
8 #include <linux/bootmem.h>
12 * DMI stands for "Desktop Management Interface". It is part
13 * of and an antecedent to, SMBIOS, which stands for System
14 * Management BIOS. See further: http://www.dmtf.org/standards
16 static char dmi_empty_string
[] = " ";
19 * Catch too early calls to dmi_check_system():
21 static int dmi_initialized
;
23 static const char * __init
dmi_string_nosave(const struct dmi_header
*dm
, u8 s
)
25 const u8
*bp
= ((u8
*) dm
) + dm
->length
;
29 while (s
> 0 && *bp
) {
35 size_t len
= strlen(bp
)+1;
36 size_t cmp_len
= len
> 8 ? 8 : len
;
38 if (!memcmp(bp
, dmi_empty_string
, cmp_len
))
39 return dmi_empty_string
;
47 static char * __init
dmi_string(const struct dmi_header
*dm
, u8 s
)
49 const char *bp
= dmi_string_nosave(dm
, s
);
53 if (bp
== dmi_empty_string
)
54 return dmi_empty_string
;
61 printk(KERN_ERR
"dmi_string: cannot allocate %Zu bytes.\n", len
);
67 * We have to be cautious here. We have seen BIOSes with DMI pointers
68 * pointing to completely the wrong place for example
70 static void dmi_table(u8
*buf
, int len
, int num
,
71 void (*decode
)(const struct dmi_header
*, void *),
78 * Stop when we see all the items the table claimed to have
79 * OR we run off the end of the table (also happens)
81 while ((i
< num
) && (data
- buf
+ sizeof(struct dmi_header
)) <= len
) {
82 const struct dmi_header
*dm
= (const struct dmi_header
*)data
;
85 * We want to know the total length (formatted area and
86 * strings) before decoding to make sure we won't run off the
87 * table in dmi_decode or dmi_string
90 while ((data
- buf
< len
- 1) && (data
[0] || data
[1]))
92 if (data
- buf
< len
- 1)
93 decode(dm
, private_data
);
103 static int __init
dmi_walk_early(void (*decode
)(const struct dmi_header
*,
108 buf
= dmi_ioremap(dmi_base
, dmi_len
);
112 dmi_table(buf
, dmi_len
, dmi_num
, decode
, NULL
);
114 dmi_iounmap(buf
, dmi_len
);
118 static int __init
dmi_checksum(const u8
*buf
)
123 for (a
= 0; a
< 15; a
++)
129 static char *dmi_ident
[DMI_STRING_MAX
];
130 static LIST_HEAD(dmi_devices
);
136 static void __init
dmi_save_ident(const struct dmi_header
*dm
, int slot
, int string
)
138 const char *d
= (const char*) dm
;
144 p
= dmi_string(dm
, d
[string
]);
151 static void __init
dmi_save_uuid(const struct dmi_header
*dm
, int slot
, int index
)
153 const u8
*d
= (u8
*) dm
+ index
;
155 int is_ff
= 1, is_00
= 1, i
;
160 for (i
= 0; i
< 16 && (is_ff
|| is_00
); i
++) {
161 if(d
[i
] != 0x00) is_ff
= 0;
162 if(d
[i
] != 0xFF) is_00
= 0;
168 s
= dmi_alloc(16*2+4+1);
172 sprintf(s
, "%pUB", d
);
177 static void __init
dmi_save_type(const struct dmi_header
*dm
, int slot
, int index
)
179 const u8
*d
= (u8
*) dm
+ index
;
189 sprintf(s
, "%u", *d
& 0x7F);
193 static void __init
dmi_save_one_device(int type
, const char *name
)
195 struct dmi_device
*dev
;
197 /* No duplicate device */
198 if (dmi_find_device(type
, name
, NULL
))
201 dev
= dmi_alloc(sizeof(*dev
) + strlen(name
) + 1);
203 printk(KERN_ERR
"dmi_save_one_device: out of memory.\n");
208 strcpy((char *)(dev
+ 1), name
);
209 dev
->name
= (char *)(dev
+ 1);
210 dev
->device_data
= NULL
;
211 list_add(&dev
->list
, &dmi_devices
);
214 static void __init
dmi_save_devices(const struct dmi_header
*dm
)
216 int i
, count
= (dm
->length
- sizeof(struct dmi_header
)) / 2;
218 for (i
= 0; i
< count
; i
++) {
219 const char *d
= (char *)(dm
+ 1) + (i
* 2);
221 /* Skip disabled device */
222 if ((*d
& 0x80) == 0)
225 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
+ 1)));
229 static void __init
dmi_save_oem_strings_devices(const struct dmi_header
*dm
)
231 int i
, count
= *(u8
*)(dm
+ 1);
232 struct dmi_device
*dev
;
234 for (i
= 1; i
<= count
; i
++) {
235 char *devname
= dmi_string(dm
, i
);
237 if (devname
== dmi_empty_string
)
240 dev
= dmi_alloc(sizeof(*dev
));
243 "dmi_save_oem_strings_devices: out of memory.\n");
247 dev
->type
= DMI_DEV_TYPE_OEM_STRING
;
249 dev
->device_data
= NULL
;
251 list_add(&dev
->list
, &dmi_devices
);
255 static void __init
dmi_save_ipmi_device(const struct dmi_header
*dm
)
257 struct dmi_device
*dev
;
260 data
= dmi_alloc(dm
->length
);
262 printk(KERN_ERR
"dmi_save_ipmi_device: out of memory.\n");
266 memcpy(data
, dm
, dm
->length
);
268 dev
= dmi_alloc(sizeof(*dev
));
270 printk(KERN_ERR
"dmi_save_ipmi_device: out of memory.\n");
274 dev
->type
= DMI_DEV_TYPE_IPMI
;
275 dev
->name
= "IPMI controller";
276 dev
->device_data
= data
;
278 list_add_tail(&dev
->list
, &dmi_devices
);
281 static void __init
dmi_save_dev_onboard(int instance
, int segment
, int bus
,
282 int devfn
, const char *name
)
284 struct dmi_dev_onboard
*onboard_dev
;
286 onboard_dev
= dmi_alloc(sizeof(*onboard_dev
) + strlen(name
) + 1);
288 printk(KERN_ERR
"dmi_save_dev_onboard: out of memory.\n");
291 onboard_dev
->instance
= instance
;
292 onboard_dev
->segment
= segment
;
293 onboard_dev
->bus
= bus
;
294 onboard_dev
->devfn
= devfn
;
296 strcpy((char *)&onboard_dev
[1], name
);
297 onboard_dev
->dev
.type
= DMI_DEV_TYPE_DEV_ONBOARD
;
298 onboard_dev
->dev
.name
= (char *)&onboard_dev
[1];
299 onboard_dev
->dev
.device_data
= onboard_dev
;
301 list_add(&onboard_dev
->dev
.list
, &dmi_devices
);
304 static void __init
dmi_save_extended_devices(const struct dmi_header
*dm
)
306 const u8
*d
= (u8
*) dm
+ 5;
308 /* Skip disabled device */
309 if ((*d
& 0x80) == 0)
312 dmi_save_dev_onboard(*(d
+1), *(u16
*)(d
+2), *(d
+4), *(d
+5),
313 dmi_string_nosave(dm
, *(d
-1)));
314 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
- 1)));
318 * Process a DMI table entry. Right now all we care about are the BIOS
319 * and machine entries. For 2.5 we should pull the smbus controller info
322 static void __init
dmi_decode(const struct dmi_header
*dm
, void *dummy
)
325 case 0: /* BIOS Information */
326 dmi_save_ident(dm
, DMI_BIOS_VENDOR
, 4);
327 dmi_save_ident(dm
, DMI_BIOS_VERSION
, 5);
328 dmi_save_ident(dm
, DMI_BIOS_DATE
, 8);
330 case 1: /* System Information */
331 dmi_save_ident(dm
, DMI_SYS_VENDOR
, 4);
332 dmi_save_ident(dm
, DMI_PRODUCT_NAME
, 5);
333 dmi_save_ident(dm
, DMI_PRODUCT_VERSION
, 6);
334 dmi_save_ident(dm
, DMI_PRODUCT_SERIAL
, 7);
335 dmi_save_uuid(dm
, DMI_PRODUCT_UUID
, 8);
337 case 2: /* Base Board Information */
338 dmi_save_ident(dm
, DMI_BOARD_VENDOR
, 4);
339 dmi_save_ident(dm
, DMI_BOARD_NAME
, 5);
340 dmi_save_ident(dm
, DMI_BOARD_VERSION
, 6);
341 dmi_save_ident(dm
, DMI_BOARD_SERIAL
, 7);
342 dmi_save_ident(dm
, DMI_BOARD_ASSET_TAG
, 8);
344 case 3: /* Chassis Information */
345 dmi_save_ident(dm
, DMI_CHASSIS_VENDOR
, 4);
346 dmi_save_type(dm
, DMI_CHASSIS_TYPE
, 5);
347 dmi_save_ident(dm
, DMI_CHASSIS_VERSION
, 6);
348 dmi_save_ident(dm
, DMI_CHASSIS_SERIAL
, 7);
349 dmi_save_ident(dm
, DMI_CHASSIS_ASSET_TAG
, 8);
351 case 10: /* Onboard Devices Information */
352 dmi_save_devices(dm
);
354 case 11: /* OEM Strings */
355 dmi_save_oem_strings_devices(dm
);
357 case 38: /* IPMI Device Information */
358 dmi_save_ipmi_device(dm
);
360 case 41: /* Onboard Devices Extended Information */
361 dmi_save_extended_devices(dm
);
365 static void __init
print_filtered(const char *info
)
372 for (p
= info
; *p
; p
++)
374 printk(KERN_CONT
"%c", *p
);
376 printk(KERN_CONT
"\\x%02x", *p
& 0xff);
379 static void __init
dmi_dump_ids(void)
381 const char *board
; /* Board Name is optional */
383 printk(KERN_DEBUG
"DMI: ");
384 print_filtered(dmi_get_system_info(DMI_SYS_VENDOR
));
385 printk(KERN_CONT
" ");
386 print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME
));
387 board
= dmi_get_system_info(DMI_BOARD_NAME
);
389 printk(KERN_CONT
"/");
390 print_filtered(board
);
392 printk(KERN_CONT
", BIOS ");
393 print_filtered(dmi_get_system_info(DMI_BIOS_VERSION
));
394 printk(KERN_CONT
" ");
395 print_filtered(dmi_get_system_info(DMI_BIOS_DATE
));
396 printk(KERN_CONT
"\n");
399 static int __init
dmi_present(const char __iomem
*p
)
403 memcpy_fromio(buf
, p
, 15);
404 if ((memcmp(buf
, "_DMI_", 5) == 0) && dmi_checksum(buf
)) {
405 dmi_num
= (buf
[13] << 8) | buf
[12];
406 dmi_len
= (buf
[7] << 8) | buf
[6];
407 dmi_base
= (buf
[11] << 24) | (buf
[10] << 16) |
408 (buf
[9] << 8) | buf
[8];
411 * DMI version 0.0 means that the real version is taken from
412 * the SMBIOS version, which we don't know at this point.
415 printk(KERN_INFO
"DMI %d.%d present.\n",
416 buf
[14] >> 4, buf
[14] & 0xF);
418 printk(KERN_INFO
"DMI present.\n");
419 if (dmi_walk_early(dmi_decode
) == 0) {
427 void __init
dmi_scan_machine(void)
433 if (efi
.smbios
== EFI_INVALID_TABLE_ADDR
)
436 /* This is called as a core_initcall() because it isn't
437 * needed during early boot. This also means we can
438 * iounmap the space when we're done with it.
440 p
= dmi_ioremap(efi
.smbios
, 32);
444 rc
= dmi_present(p
+ 0x10); /* offset of _DMI_ string */
453 * no iounmap() for that ioremap(); it would be a no-op, but
454 * it's so early in setup that sucker gets confused into doing
455 * what it shouldn't if we actually call it.
457 p
= dmi_ioremap(0xF0000, 0x10000);
461 for (q
= p
; q
< p
+ 0x10000; q
+= 16) {
465 dmi_iounmap(p
, 0x10000);
469 dmi_iounmap(p
, 0x10000);
472 printk(KERN_INFO
"DMI not present or invalid.\n");
478 * dmi_matches - check if dmi_system_id structure matches system DMI data
479 * @dmi: pointer to the dmi_system_id structure to check
481 static bool dmi_matches(const struct dmi_system_id
*dmi
)
485 WARN(!dmi_initialized
, KERN_ERR
"dmi check: not initialized yet.\n");
487 for (i
= 0; i
< ARRAY_SIZE(dmi
->matches
); i
++) {
488 int s
= dmi
->matches
[i
].slot
;
492 && strstr(dmi_ident
[s
], dmi
->matches
[i
].substr
))
501 * dmi_is_end_of_table - check for end-of-table marker
502 * @dmi: pointer to the dmi_system_id structure to check
504 static bool dmi_is_end_of_table(const struct dmi_system_id
*dmi
)
506 return dmi
->matches
[0].slot
== DMI_NONE
;
510 * dmi_check_system - check system DMI data
511 * @list: array of dmi_system_id structures to match against
512 * All non-null elements of the list must match
513 * their slot's (field index's) data (i.e., each
514 * list string must be a substring of the specified
515 * DMI slot's string data) to be considered a
518 * Walk the blacklist table running matching functions until someone
519 * returns non zero or we hit the end. Callback function is called for
520 * each successful match. Returns the number of matches.
522 int dmi_check_system(const struct dmi_system_id
*list
)
525 const struct dmi_system_id
*d
;
527 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
528 if (dmi_matches(d
)) {
530 if (d
->callback
&& d
->callback(d
))
536 EXPORT_SYMBOL(dmi_check_system
);
539 * dmi_first_match - find dmi_system_id structure matching system DMI data
540 * @list: array of dmi_system_id structures to match against
541 * All non-null elements of the list must match
542 * their slot's (field index's) data (i.e., each
543 * list string must be a substring of the specified
544 * DMI slot's string data) to be considered a
547 * Walk the blacklist table until the first match is found. Return the
548 * pointer to the matching entry or NULL if there's no match.
550 const struct dmi_system_id
*dmi_first_match(const struct dmi_system_id
*list
)
552 const struct dmi_system_id
*d
;
554 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
560 EXPORT_SYMBOL(dmi_first_match
);
563 * dmi_get_system_info - return DMI data value
564 * @field: data index (see enum dmi_field)
566 * Returns one DMI data value, can be used to perform
567 * complex DMI data checks.
569 const char *dmi_get_system_info(int field
)
571 return dmi_ident
[field
];
573 EXPORT_SYMBOL(dmi_get_system_info
);
576 * dmi_name_in_serial - Check if string is in the DMI product serial information
577 * @str: string to check for
579 int dmi_name_in_serial(const char *str
)
581 int f
= DMI_PRODUCT_SERIAL
;
582 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
588 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
589 * @str: Case sensitive Name
591 int dmi_name_in_vendors(const char *str
)
593 static int fields
[] = { DMI_BIOS_VENDOR
, DMI_BIOS_VERSION
, DMI_SYS_VENDOR
,
594 DMI_PRODUCT_NAME
, DMI_PRODUCT_VERSION
, DMI_BOARD_VENDOR
,
595 DMI_BOARD_NAME
, DMI_BOARD_VERSION
, DMI_NONE
};
597 for (i
= 0; fields
[i
] != DMI_NONE
; i
++) {
599 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
604 EXPORT_SYMBOL(dmi_name_in_vendors
);
607 * dmi_find_device - find onboard device by type/name
608 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
609 * @name: device name string or %NULL to match all
610 * @from: previous device found in search, or %NULL for new search.
612 * Iterates through the list of known onboard devices. If a device is
613 * found with a matching @vendor and @device, a pointer to its device
614 * structure is returned. Otherwise, %NULL is returned.
615 * A new search is initiated by passing %NULL as the @from argument.
616 * If @from is not %NULL, searches continue from next device.
618 const struct dmi_device
* dmi_find_device(int type
, const char *name
,
619 const struct dmi_device
*from
)
621 const struct list_head
*head
= from
? &from
->list
: &dmi_devices
;
624 for(d
= head
->next
; d
!= &dmi_devices
; d
= d
->next
) {
625 const struct dmi_device
*dev
=
626 list_entry(d
, struct dmi_device
, list
);
628 if (((type
== DMI_DEV_TYPE_ANY
) || (dev
->type
== type
)) &&
629 ((name
== NULL
) || (strcmp(dev
->name
, name
) == 0)))
635 EXPORT_SYMBOL(dmi_find_device
);
638 * dmi_get_date - parse a DMI date
639 * @field: data index (see enum dmi_field)
640 * @yearp: optional out parameter for the year
641 * @monthp: optional out parameter for the month
642 * @dayp: optional out parameter for the day
644 * The date field is assumed to be in the form resembling
645 * [mm[/dd]]/yy[yy] and the result is stored in the out
646 * parameters any or all of which can be omitted.
648 * If the field doesn't exist, all out parameters are set to zero
649 * and false is returned. Otherwise, true is returned with any
650 * invalid part of date set to zero.
652 * On return, year, month and day are guaranteed to be in the
653 * range of [0,9999], [0,12] and [0,31] respectively.
655 bool dmi_get_date(int field
, int *yearp
, int *monthp
, int *dayp
)
657 int year
= 0, month
= 0, day
= 0;
662 s
= dmi_get_system_info(field
);
668 * Determine year first. We assume the date string resembles
669 * mm/dd/yy[yy] but the original code extracted only the year
670 * from the end. Keep the behavior in the spirit of no
678 year
= simple_strtoul(y
, &e
, 10);
679 if (y
!= e
&& year
< 100) { /* 2-digit year */
681 if (year
< 1996) /* no dates < spec 1.0 */
684 if (year
> 9999) /* year should fit in %04d */
687 /* parse the mm and dd */
688 month
= simple_strtoul(s
, &e
, 10);
689 if (s
== e
|| *e
!= '/' || !month
|| month
> 12) {
695 day
= simple_strtoul(s
, &e
, 10);
696 if (s
== y
|| s
== e
|| *e
!= '/' || day
> 31)
707 EXPORT_SYMBOL(dmi_get_date
);
710 * dmi_walk - Walk the DMI table and get called back for every record
711 * @decode: Callback function
712 * @private_data: Private data to be passed to the callback function
714 * Returns -1 when the DMI table can't be reached, 0 on success.
716 int dmi_walk(void (*decode
)(const struct dmi_header
*, void *),
724 buf
= ioremap(dmi_base
, dmi_len
);
728 dmi_table(buf
, dmi_len
, dmi_num
, decode
, private_data
);
733 EXPORT_SYMBOL_GPL(dmi_walk
);
736 * dmi_match - compare a string to the dmi field (if exists)
737 * @f: DMI field identifier
738 * @str: string to compare the DMI field to
740 * Returns true if the requested field equals to the str (including NULL).
742 bool dmi_match(enum dmi_field f
, const char *str
)
744 const char *info
= dmi_get_system_info(f
);
746 if (info
== NULL
|| str
== NULL
)
749 return !strcmp(info
, str
);
751 EXPORT_SYMBOL_GPL(dmi_match
);