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