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/dmi.h>
   6 #include <linux/efi.h>
   7 #include <linux/bootmem.h>
   8 #include <linux/slab.h>
   9 #include <asm/dmi.h>
  10
  11 static char dmi_empty_string[] = "        ";
  12
  13 static char * __init dmi_string(const struct dmi_header *dm, u8 s)
  14 {
  15         const u8 *bp = ((u8 *) dm) + dm->length;
  16         char *str = "";
  17
  18         if (s) {
  19                 s--;
  20                 while (s > 0 && *bp) {
  21                         bp += strlen(bp) + 1;
  22                         s--;
  23                 }
  24
  25                 if (*bp != 0) {
  26                         size_t len = strlen(bp)+1;
  27                         size_t cmp_len = len > 8 ? 8 : len;
  28
  29                         if (!memcmp(bp, dmi_empty_string, cmp_len))
  30                                 return dmi_empty_string;
  31                         str = dmi_alloc(len);
  32                         if (str != NULL)
  33                                 strcpy(str, bp);
  34                         else
  35                                 printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
  36                 }
  37         }
  38
  39         return str;
  40 }
  41
  42 /*
  43  *      We have to be cautious here. We have seen BIOSes with DMI pointers
  44  *      pointing to completely the wrong place for example
  45  */
  46 static int __init dmi_table(u32 base, int len, int num,
  47                             void (*decode)(const struct dmi_header *))
  48 {
  49         u8 *buf, *data;
  50         int i = 0;
  51
  52         buf = dmi_ioremap(base, len);
  53         if (buf == NULL)
  54                 return -1;
  55
  56         data = buf;
  57
  58         /*
  59          *      Stop when we see all the items the table claimed to have
  60          *      OR we run off the end of the table (also happens)
  61          */
  62         while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
  63                 const struct dmi_header *dm = (const struct dmi_header *)data;
  64
  65                 /*
  66                  *  We want to know the total length (formated area and strings)
  67                  *  before decoding to make sure we won't run off the table in
  68                  *  dmi_decode or dmi_string
  69                  */
  70                 data += dm->length;
  71                 while ((data - buf < len - 1) && (data[0] || data[1]))
  72                         data++;
  73                 if (data - buf < len - 1)
  74                         decode(dm);
  75                 data += 2;
  76                 i++;
  77         }
  78         dmi_iounmap(buf, len);
  79         return 0;
  80 }
  81
  82 static int __init dmi_checksum(const u8 *buf)
  83 {
  84         u8 sum = 0;
  85         int a;
  86
  87         for (a = 0; a < 15; a++)
  88                 sum += buf[a];
  89
  90         return sum == 0;
  91 }
  92
  93 static char *dmi_ident[DMI_STRING_MAX];
  94 static LIST_HEAD(dmi_devices);
  95 int dmi_available;
  96
  97 /*
  98  *      Save a DMI string
  99  */
 100 static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
 101 {
 102         const char *d = (const char*) dm;
 103         char *p;
 104
 105         if (dmi_ident[slot])
 106                 return;
 107
 108         p = dmi_string(dm, d[string]);
 109         if (p == NULL)
 110                 return;
 111
 112         dmi_ident[slot] = p;
 113 }
 114
 115 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
 116 {
 117         const u8 *d = (u8*) dm + index;
 118         char *s;
 119         int is_ff = 1, is_00 = 1, i;
 120
 121         if (dmi_ident[slot])
 122                 return;
 123
 124         for (i = 0; i < 16 && (is_ff || is_00); i++) {
 125                 if(d[i] != 0x00) is_ff = 0;
 126                 if(d[i] != 0xFF) is_00 = 0;
 127         }
 128
 129         if (is_ff || is_00)
 130                 return;
 131
 132         s = dmi_alloc(16*2+4+1);
 133         if (!s)
 134                 return;
 135
 136         sprintf(s,
 137                 "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
 138                 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
 139                 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
 140
 141         dmi_ident[slot] = s;
 142 }
 143
 144 static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
 145 {
 146         const u8 *d = (u8*) dm + index;
 147         char *s;
 148
 149         if (dmi_ident[slot])
 150                 return;
 151
 152         s = dmi_alloc(4);
 153         if (!s)
 154                 return;
 155
 156         sprintf(s, "%u", *d & 0x7F);
 157         dmi_ident[slot] = s;
 158 }
 159
 160 static void __init dmi_save_devices(const struct dmi_header *dm)
 161 {
 162         int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
 163         struct dmi_device *dev;
 164
 165         for (i = 0; i < count; i++) {
 166                 const char *d = (char *)(dm + 1) + (i * 2);
 167
 168                 /* Skip disabled device */
 169                 if ((*d & 0x80) == 0)
 170                         continue;
 171
 172                 dev = dmi_alloc(sizeof(*dev));
 173                 if (!dev) {
 174                         printk(KERN_ERR "dmi_save_devices: out of memory.\n");
 175                         break;
 176                 }
 177
 178                 dev->type = *d++ & 0x7f;
 179                 dev->name = dmi_string(dm, *d);
 180                 dev->device_data = NULL;
 181                 list_add(&dev->list, &dmi_devices);
 182         }
 183 }
 184
 185 static struct dmi_device empty_oem_string_dev = {
 186         .name = dmi_empty_string,
 187 };
 188
 189 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
 190 {
 191         int i, count = *(u8 *)(dm + 1);
 192         struct dmi_device *dev;
 193
 194         for (i = 1; i <= count; i++) {
 195                 char *devname = dmi_string(dm, i);
 196
 197                 if (!strcmp(devname, dmi_empty_string)) {
 198                         list_add(&empty_oem_string_dev.list, &dmi_devices);
 199                         continue;
 200                 }
 201
 202                 dev = dmi_alloc(sizeof(*dev));
 203                 if (!dev) {
 204                         printk(KERN_ERR
 205                            "dmi_save_oem_strings_devices: out of memory.\n");
 206                         break;
 207                 }
 208
 209                 dev->type = DMI_DEV_TYPE_OEM_STRING;
 210                 dev->name = devname;
 211                 dev->device_data = NULL;
 212
 213                 list_add(&dev->list, &dmi_devices);
 214         }
 215 }
 216
 217 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
 218 {
 219         struct dmi_device *dev;
 220         void * data;
 221
 222         data = dmi_alloc(dm->length);
 223         if (data == NULL) {
 224                 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
 225                 return;
 226         }
 227
 228         memcpy(data, dm, dm->length);
 229
 230         dev = dmi_alloc(sizeof(*dev));
 231         if (!dev) {
 232                 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
 233                 return;
 234         }
 235
 236         dev->type = DMI_DEV_TYPE_IPMI;
 237         dev->name = "IPMI controller";
 238         dev->device_data = data;
 239
 240         list_add(&dev->list, &dmi_devices);
 241 }
 242
 243 /*
 244  *      Process a DMI table entry. Right now all we care about are the BIOS
 245  *      and machine entries. For 2.5 we should pull the smbus controller info
 246  *      out of here.
 247  */
 248 static void __init dmi_decode(const struct dmi_header *dm)
 249 {
 250         switch(dm->type) {
 251         case 0:         /* BIOS Information */
 252                 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
 253                 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 254                 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
 255                 break;
 256         case 1:         /* System Information */
 257                 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
 258                 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
 259                 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
 260                 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
 261                 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
 262                 break;
 263         case 2:         /* Base Board Information */
 264                 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
 265                 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
 266                 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
 267                 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
 268                 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
 269                 break;
 270         case 3:         /* Chassis Information */
 271                 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
 272                 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
 273                 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
 274                 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
 275                 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
 276                 break;
 277         case 10:        /* Onboard Devices Information */
 278                 dmi_save_devices(dm);
 279                 break;
 280         case 11:        /* OEM Strings */
 281                 dmi_save_oem_strings_devices(dm);
 282                 break;
 283         case 38:        /* IPMI Device Information */
 284                 dmi_save_ipmi_device(dm);
 285         }
 286 }
 287
 288 static int __init dmi_present(const char __iomem *p)
 289 {
 290         u8 buf[15];
 291
 292         memcpy_fromio(buf, p, 15);
 293         if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
 294                 u16 num = (buf[13] << 8) | buf[12];
 295                 u16 len = (buf[7] << 8) | buf[6];
 296                 u32 base = (buf[11] << 24) | (buf[10] << 16) |
 297                         (buf[9] << 8) | buf[8];
 298
 299                 /*
 300                  * DMI version 0.0 means that the real version is taken from
 301                  * the SMBIOS version, which we don't know at this point.
 302                  */
 303                 if (buf[14] != 0)
 304                         printk(KERN_INFO "DMI %d.%d present.\n",
 305                                buf[14] >> 4, buf[14] & 0xF);
 306                 else
 307                         printk(KERN_INFO "DMI present.\n");
 308                 if (dmi_table(base,len, num, dmi_decode) == 0)
 309                         return 0;
 310         }
 311         return 1;
 312 }
 313
 314 void __init dmi_scan_machine(void)
 315 {
 316         char __iomem *p, *q;
 317         int rc;
 318
 319         if (efi_enabled) {
 320                 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
 321                         goto out;
 322
 323                 /* This is called as a core_initcall() because it isn't
 324                  * needed during early boot.  This also means we can
 325                  * iounmap the space when we're done with it.
 326                  */
 327                 p = dmi_ioremap(efi.smbios, 32);
 328                 if (p == NULL)
 329                         goto out;
 330
 331                 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
 332                 dmi_iounmap(p, 32);
 333                 if (!rc) {
 334                         dmi_available = 1;
 335                         return;
 336                 }
 337         }
 338         else {
 339                 /*
 340                  * no iounmap() for that ioremap(); it would be a no-op, but
 341                  * it's so early in setup that sucker gets confused into doing
 342                  * what it shouldn't if we actually call it.
 343                  */
 344                 p = dmi_ioremap(0xF0000, 0x10000);
 345                 if (p == NULL)
 346                         goto out;
 347
 348                 for (q = p; q < p + 0x10000; q += 16) {
 349                         rc = dmi_present(q);
 350                         if (!rc) {
 351                                 dmi_available = 1;
 352                                 dmi_iounmap(p, 0x10000);
 353                                 return;
 354                         }
 355                 }
 356                 dmi_iounmap(p, 0x10000);
 357         }
 358  out:   printk(KERN_INFO "DMI not present or invalid.\n");
 359 }
 360
 361 /**
 362  *      dmi_check_system - check system DMI data
 363  *      @list: array of dmi_system_id structures to match against
 364  *              All non-null elements of the list must match
 365  *              their slot's (field index's) data (i.e., each
 366  *              list string must be a substring of the specified
 367  *              DMI slot's string data) to be considered a
 368  *              successful match.
 369  *
 370  *      Walk the blacklist table running matching functions until someone
 371  *      returns non zero or we hit the end. Callback function is called for
 372  *      each successful match. Returns the number of matches.
 373  */
 374 int dmi_check_system(const struct dmi_system_id *list)
 375 {
 376         int i, count = 0;
 377         const struct dmi_system_id *d = list;
 378
 379         while (d->ident) {
 380                 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
 381                         int s = d->matches[i].slot;
 382                         if (s == DMI_NONE)
 383                                 continue;
 384                         if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
 385                                 continue;
 386                         /* No match */
 387                         goto fail;
 388                 }
 389                 count++;
 390                 if (d->callback && d->callback(d))
 391                         break;
 392 fail:           d++;
 393         }
 394
 395         return count;
 396 }
 397 EXPORT_SYMBOL(dmi_check_system);
 398
 399 /**
 400  *      dmi_get_system_info - return DMI data value
 401  *      @field: data index (see enum dmi_field)
 402  *
 403  *      Returns one DMI data value, can be used to perform
 404  *      complex DMI data checks.
 405  */
 406 const char *dmi_get_system_info(int field)
 407 {
 408         return dmi_ident[field];
 409 }
 410 EXPORT_SYMBOL(dmi_get_system_info);
 411
 412
 413 /**
 414  *      dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
 415  *      @str:   Case sensitive Name
 416  */
 417 int dmi_name_in_vendors(const char *str)
 418 {
 419         static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
 420                                 DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
 421                                 DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
 422         int i;
 423         for (i = 0; fields[i] != DMI_NONE; i++) {
 424                 int f = fields[i];
 425                 if (dmi_ident[f] && strstr(dmi_ident[f], str))
 426                         return 1;
 427         }
 428         return 0;
 429 }
 430 EXPORT_SYMBOL(dmi_name_in_vendors);
 431
 432 /**
 433  *      dmi_find_device - find onboard device by type/name
 434  *      @type: device type or %DMI_DEV_TYPE_ANY to match all device types
 435  *      @name: device name string or %NULL to match all
 436  *      @from: previous device found in search, or %NULL for new search.
 437  *
 438  *      Iterates through the list of known onboard devices. If a device is
 439  *      found with a matching @vendor and @device, a pointer to its device
 440  *      structure is returned.  Otherwise, %NULL is returned.
 441  *      A new search is initiated by passing %NULL as the @from argument.
 442  *      If @from is not %NULL, searches continue from next device.
 443  */
 444 const struct dmi_device * dmi_find_device(int type, const char *name,
 445                                     const struct dmi_device *from)
 446 {
 447         const struct list_head *head = from ? &from->list : &dmi_devices;
 448         struct list_head *d;
 449
 450         for(d = head->next; d != &dmi_devices; d = d->next) {
 451                 const struct dmi_device *dev =
 452                         list_entry(d, struct dmi_device, list);
 453
 454                 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
 455                     ((name == NULL) || (strcmp(dev->name, name) == 0)))
 456                         return dev;
 457         }
 458
 459         return NULL;
 460 }
 461 EXPORT_SYMBOL(dmi_find_device);
 462
 463 /**
 464  *      dmi_get_year - Return year of a DMI date
 465  *      @field: data index (like dmi_get_system_info)
 466  *
 467  *      Returns -1 when the field doesn't exist. 0 when it is broken.
 468  */
 469 int dmi_get_year(int field)
 470 {
 471         int year;
 472         const char *s = dmi_get_system_info(field);
 473
 474         if (!s)
 475                 return -1;
 476         if (*s == '\0')
 477                 return 0;
 478         s = strrchr(s, '/');
 479         if (!s)
 480                 return 0;
 481
 482         s += 1;
 483         year = simple_strtoul(s, NULL, 0);
 484         if (year && year < 100) {       /* 2-digit year */
 485                 year += 1900;
 486                 if (year < 1996)        /* no dates < spec 1.0 */
 487                         year += 100;
 488         }
 489
 490         return year;
 491 }