1 /* 2 * Copyright 2007-2010 Red Hat, Inc. 3 * by Peter Jones <pjones@redhat.com> 4 * Copyright 2008 IBM, Inc. 5 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 6 * Copyright 2008 7 * by Konrad Rzeszutek <ketuzsezr@darnok.org> 8 * 9 * This code exposes the iSCSI Boot Format Table to userland via sysfs. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License v2.0 as published by 13 * the Free Software Foundation 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * Changelog: 21 * 22 * 06 Jan 2010 - Peter Jones <pjones@redhat.com> 23 * New changelog entries are in the git log from now on. Not here. 24 * 25 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org> 26 * Updated comments and copyrights. (v0.4.9) 27 * 28 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 29 * Converted to using ibft_addr. (v0.4.8) 30 * 31 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 32 * Combined two functions in one: reserve_ibft_region. (v0.4.7) 33 * 34 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 35 * Added logic to handle IPv6 addresses. (v0.4.6) 36 * 37 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 38 * Added logic to handle badly not-to-spec iBFT. (v0.4.5) 39 * 40 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 41 * Added __init to function declarations. (v0.4.4) 42 * 43 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 44 * Updated kobject registration, combined unregister functions in one 45 * and code and style cleanup. (v0.4.3) 46 * 47 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 48 * Added end-markers to enums and re-organized kobject registration. (v0.4.2) 49 * 50 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 51 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1) 52 * 53 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 54 * Added sysfs-ibft documentation, moved 'find_ibft' function to 55 * in its own file and added text attributes for every struct field. (v0.4) 56 * 57 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 58 * Added text attributes emulating OpenFirmware /proc/device-tree naming. 59 * Removed binary /sysfs interface (v0.3) 60 * 61 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 62 * Added functionality in setup.c to reserve iBFT region. (v0.2) 63 * 64 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 65 * First version exposing iBFT data via a binary /sysfs. (v0.1) 66 * 67 */ 68 69 70 #include <linux/blkdev.h> 71 #include <linux/capability.h> 72 #include <linux/ctype.h> 73 #include <linux/device.h> 74 #include <linux/err.h> 75 #include <linux/init.h> 76 #include <linux/iscsi_ibft.h> 77 #include <linux/limits.h> 78 #include <linux/module.h> 79 #include <linux/pci.h> 80 #include <linux/slab.h> 81 #include <linux/stat.h> 82 #include <linux/string.h> 83 #include <linux/types.h> 84 #include <linux/acpi.h> 85 #include <linux/iscsi_boot_sysfs.h> 86 87 #define IBFT_ISCSI_VERSION "0.5.0" 88 #define IBFT_ISCSI_DATE "2010-Feb-25" 89 90 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and " 91 "Konrad Rzeszutek <ketuzsezr@darnok.org>"); 92 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information"); 93 MODULE_LICENSE("GPL"); 94 MODULE_VERSION(IBFT_ISCSI_VERSION); 95 96 struct ibft_hdr { 97 u8 id; 98 u8 version; 99 u16 length; 100 u8 index; 101 u8 flags; 102 } __attribute__((__packed__)); 103 104 struct ibft_control { 105 struct ibft_hdr hdr; 106 u16 extensions; 107 u16 initiator_off; 108 u16 nic0_off; 109 u16 tgt0_off; 110 u16 nic1_off; 111 u16 tgt1_off; 112 } __attribute__((__packed__)); 113 114 struct ibft_initiator { 115 struct ibft_hdr hdr; 116 char isns_server[16]; 117 char slp_server[16]; 118 char pri_radius_server[16]; 119 char sec_radius_server[16]; 120 u16 initiator_name_len; 121 u16 initiator_name_off; 122 } __attribute__((__packed__)); 123 124 struct ibft_nic { 125 struct ibft_hdr hdr; 126 char ip_addr[16]; 127 u8 subnet_mask_prefix; 128 u8 origin; 129 char gateway[16]; 130 char primary_dns[16]; 131 char secondary_dns[16]; 132 char dhcp[16]; 133 u16 vlan; 134 char mac[6]; 135 u16 pci_bdf; 136 u16 hostname_len; 137 u16 hostname_off; 138 } __attribute__((__packed__)); 139 140 struct ibft_tgt { 141 struct ibft_hdr hdr; 142 char ip_addr[16]; 143 u16 port; 144 char lun[8]; 145 u8 chap_type; 146 u8 nic_assoc; 147 u16 tgt_name_len; 148 u16 tgt_name_off; 149 u16 chap_name_len; 150 u16 chap_name_off; 151 u16 chap_secret_len; 152 u16 chap_secret_off; 153 u16 rev_chap_name_len; 154 u16 rev_chap_name_off; 155 u16 rev_chap_secret_len; 156 u16 rev_chap_secret_off; 157 } __attribute__((__packed__)); 158 159 /* 160 * The kobject different types and its names. 161 * 162 */ 163 enum ibft_id { 164 id_reserved = 0, /* We don't support. */ 165 id_control = 1, /* Should show up only once and is not exported. */ 166 id_initiator = 2, 167 id_nic = 3, 168 id_target = 4, 169 id_extensions = 5, /* We don't support. */ 170 id_end_marker, 171 }; 172 173 /* 174 * The kobject and attribute structures. 175 */ 176 177 struct ibft_kobject { 178 struct acpi_table_ibft *header; 179 union { 180 struct ibft_initiator *initiator; 181 struct ibft_nic *nic; 182 struct ibft_tgt *tgt; 183 struct ibft_hdr *hdr; 184 }; 185 }; 186 187 static struct iscsi_boot_kset *boot_kset; 188 189 /* fully null address */ 190 static const char nulls[16]; 191 192 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */ 193 static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00, 194 0x00, 0x00, 0x00, 0x00, 195 0x00, 0x00, 0xff, 0xff, 196 0x00, 0x00, 0x00, 0x00 }; 197 198 static int address_not_null(u8 *ip) 199 { 200 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16)); 201 } 202 203 /* 204 * Helper functions to parse data properly. 205 */ 206 static ssize_t sprintf_ipaddr(char *buf, u8 *ip) 207 { 208 char *str = buf; 209 210 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 && 211 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 && 212 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) { 213 /* 214 * IPV4 215 */ 216 str += sprintf(buf, "%pI4", ip + 12); 217 } else { 218 /* 219 * IPv6 220 */ 221 str += sprintf(str, "%pI6", ip); 222 } 223 str += sprintf(str, "\n"); 224 return str - buf; 225 } 226 227 static ssize_t sprintf_string(char *str, int len, char *buf) 228 { 229 return sprintf(str, "%.*s\n", len, buf); 230 } 231 232 /* 233 * Helper function to verify the IBFT header. 234 */ 235 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length) 236 { 237 if (hdr->id != id) { 238 printk(KERN_ERR "iBFT error: We expected the %s " \ 239 "field header.id to have %d but " \ 240 "found %d instead!\n", t, id, hdr->id); 241 return -ENODEV; 242 } 243 if (hdr->length != length) { 244 printk(KERN_ERR "iBFT error: We expected the %s " \ 245 "field header.length to have %d but " \ 246 "found %d instead!\n", t, length, hdr->length); 247 return -ENODEV; 248 } 249 250 return 0; 251 } 252 253 /* 254 * Routines for parsing the iBFT data to be human readable. 255 */ 256 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf) 257 { 258 struct ibft_kobject *entry = data; 259 struct ibft_initiator *initiator = entry->initiator; 260 void *ibft_loc = entry->header; 261 char *str = buf; 262 263 if (!initiator) 264 return 0; 265 266 switch (type) { 267 case ISCSI_BOOT_INI_INDEX: 268 str += sprintf(str, "%d\n", initiator->hdr.index); 269 break; 270 case ISCSI_BOOT_INI_FLAGS: 271 str += sprintf(str, "%d\n", initiator->hdr.flags); 272 break; 273 case ISCSI_BOOT_INI_ISNS_SERVER: 274 str += sprintf_ipaddr(str, initiator->isns_server); 275 break; 276 case ISCSI_BOOT_INI_SLP_SERVER: 277 str += sprintf_ipaddr(str, initiator->slp_server); 278 break; 279 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 280 str += sprintf_ipaddr(str, initiator->pri_radius_server); 281 break; 282 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 283 str += sprintf_ipaddr(str, initiator->sec_radius_server); 284 break; 285 case ISCSI_BOOT_INI_INITIATOR_NAME: 286 str += sprintf_string(str, initiator->initiator_name_len, 287 (char *)ibft_loc + 288 initiator->initiator_name_off); 289 break; 290 default: 291 break; 292 } 293 294 return str - buf; 295 } 296 297 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf) 298 { 299 struct ibft_kobject *entry = data; 300 struct ibft_nic *nic = entry->nic; 301 void *ibft_loc = entry->header; 302 char *str = buf; 303 __be32 val; 304 305 if (!nic) 306 return 0; 307 308 switch (type) { 309 case ISCSI_BOOT_ETH_INDEX: 310 str += sprintf(str, "%d\n", nic->hdr.index); 311 break; 312 case ISCSI_BOOT_ETH_FLAGS: 313 str += sprintf(str, "%d\n", nic->hdr.flags); 314 break; 315 case ISCSI_BOOT_ETH_IP_ADDR: 316 str += sprintf_ipaddr(str, nic->ip_addr); 317 break; 318 case ISCSI_BOOT_ETH_SUBNET_MASK: 319 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); 320 str += sprintf(str, "%pI4", &val); 321 break; 322 case ISCSI_BOOT_ETH_PREFIX_LEN: 323 str += sprintf(str, "%d\n", nic->subnet_mask_prefix); 324 break; 325 case ISCSI_BOOT_ETH_ORIGIN: 326 str += sprintf(str, "%d\n", nic->origin); 327 break; 328 case ISCSI_BOOT_ETH_GATEWAY: 329 str += sprintf_ipaddr(str, nic->gateway); 330 break; 331 case ISCSI_BOOT_ETH_PRIMARY_DNS: 332 str += sprintf_ipaddr(str, nic->primary_dns); 333 break; 334 case ISCSI_BOOT_ETH_SECONDARY_DNS: 335 str += sprintf_ipaddr(str, nic->secondary_dns); 336 break; 337 case ISCSI_BOOT_ETH_DHCP: 338 str += sprintf_ipaddr(str, nic->dhcp); 339 break; 340 case ISCSI_BOOT_ETH_VLAN: 341 str += sprintf(str, "%d\n", nic->vlan); 342 break; 343 case ISCSI_BOOT_ETH_MAC: 344 str += sprintf(str, "%pM\n", nic->mac); 345 break; 346 case ISCSI_BOOT_ETH_HOSTNAME: 347 str += sprintf_string(str, nic->hostname_len, 348 (char *)ibft_loc + nic->hostname_off); 349 break; 350 default: 351 break; 352 } 353 354 return str - buf; 355 }; 356 357 static ssize_t ibft_attr_show_target(void *data, int type, char *buf) 358 { 359 struct ibft_kobject *entry = data; 360 struct ibft_tgt *tgt = entry->tgt; 361 void *ibft_loc = entry->header; 362 char *str = buf; 363 int i; 364 365 if (!tgt) 366 return 0; 367 368 switch (type) { 369 case ISCSI_BOOT_TGT_INDEX: 370 str += sprintf(str, "%d\n", tgt->hdr.index); 371 break; 372 case ISCSI_BOOT_TGT_FLAGS: 373 str += sprintf(str, "%d\n", tgt->hdr.flags); 374 break; 375 case ISCSI_BOOT_TGT_IP_ADDR: 376 str += sprintf_ipaddr(str, tgt->ip_addr); 377 break; 378 case ISCSI_BOOT_TGT_PORT: 379 str += sprintf(str, "%d\n", tgt->port); 380 break; 381 case ISCSI_BOOT_TGT_LUN: 382 for (i = 0; i < 8; i++) 383 str += sprintf(str, "%x", (u8)tgt->lun[i]); 384 str += sprintf(str, "\n"); 385 break; 386 case ISCSI_BOOT_TGT_NIC_ASSOC: 387 str += sprintf(str, "%d\n", tgt->nic_assoc); 388 break; 389 case ISCSI_BOOT_TGT_CHAP_TYPE: 390 str += sprintf(str, "%d\n", tgt->chap_type); 391 break; 392 case ISCSI_BOOT_TGT_NAME: 393 str += sprintf_string(str, tgt->tgt_name_len, 394 (char *)ibft_loc + tgt->tgt_name_off); 395 break; 396 case ISCSI_BOOT_TGT_CHAP_NAME: 397 str += sprintf_string(str, tgt->chap_name_len, 398 (char *)ibft_loc + tgt->chap_name_off); 399 break; 400 case ISCSI_BOOT_TGT_CHAP_SECRET: 401 str += sprintf_string(str, tgt->chap_secret_len, 402 (char *)ibft_loc + tgt->chap_secret_off); 403 break; 404 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 405 str += sprintf_string(str, tgt->rev_chap_name_len, 406 (char *)ibft_loc + 407 tgt->rev_chap_name_off); 408 break; 409 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 410 str += sprintf_string(str, tgt->rev_chap_secret_len, 411 (char *)ibft_loc + 412 tgt->rev_chap_secret_off); 413 break; 414 default: 415 break; 416 } 417 418 return str - buf; 419 } 420 421 static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf) 422 { 423 struct ibft_kobject *entry = data; 424 char *str = buf; 425 426 switch (type) { 427 case ISCSI_BOOT_ACPITBL_SIGNATURE: 428 str += sprintf_string(str, ACPI_NAME_SIZE, 429 entry->header->header.signature); 430 break; 431 case ISCSI_BOOT_ACPITBL_OEM_ID: 432 str += sprintf_string(str, ACPI_OEM_ID_SIZE, 433 entry->header->header.oem_id); 434 break; 435 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 436 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE, 437 entry->header->header.oem_table_id); 438 break; 439 default: 440 break; 441 } 442 443 return str - buf; 444 } 445 446 static int __init ibft_check_device(void) 447 { 448 int len; 449 u8 *pos; 450 u8 csum = 0; 451 452 len = ibft_addr->header.length; 453 454 /* Sanity checking of iBFT. */ 455 if (ibft_addr->header.revision != 1) { 456 printk(KERN_ERR "iBFT module supports only revision 1, " \ 457 "while this is %d.\n", 458 ibft_addr->header.revision); 459 return -ENOENT; 460 } 461 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 462 csum += *pos; 463 464 if (csum) { 465 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 466 return -ENOENT; 467 } 468 469 return 0; 470 } 471 472 /* 473 * Helper routiners to check to determine if the entry is valid 474 * in the proper iBFT structure. 475 */ 476 static umode_t ibft_check_nic_for(void *data, int type) 477 { 478 struct ibft_kobject *entry = data; 479 struct ibft_nic *nic = entry->nic; 480 umode_t rc = 0; 481 482 switch (type) { 483 case ISCSI_BOOT_ETH_INDEX: 484 case ISCSI_BOOT_ETH_FLAGS: 485 rc = S_IRUGO; 486 break; 487 case ISCSI_BOOT_ETH_IP_ADDR: 488 if (address_not_null(nic->ip_addr)) 489 rc = S_IRUGO; 490 break; 491 case ISCSI_BOOT_ETH_PREFIX_LEN: 492 case ISCSI_BOOT_ETH_SUBNET_MASK: 493 if (nic->subnet_mask_prefix) 494 rc = S_IRUGO; 495 break; 496 case ISCSI_BOOT_ETH_ORIGIN: 497 rc = S_IRUGO; 498 break; 499 case ISCSI_BOOT_ETH_GATEWAY: 500 if (address_not_null(nic->gateway)) 501 rc = S_IRUGO; 502 break; 503 case ISCSI_BOOT_ETH_PRIMARY_DNS: 504 if (address_not_null(nic->primary_dns)) 505 rc = S_IRUGO; 506 break; 507 case ISCSI_BOOT_ETH_SECONDARY_DNS: 508 if (address_not_null(nic->secondary_dns)) 509 rc = S_IRUGO; 510 break; 511 case ISCSI_BOOT_ETH_DHCP: 512 if (address_not_null(nic->dhcp)) 513 rc = S_IRUGO; 514 break; 515 case ISCSI_BOOT_ETH_VLAN: 516 case ISCSI_BOOT_ETH_MAC: 517 rc = S_IRUGO; 518 break; 519 case ISCSI_BOOT_ETH_HOSTNAME: 520 if (nic->hostname_off) 521 rc = S_IRUGO; 522 break; 523 default: 524 break; 525 } 526 527 return rc; 528 } 529 530 static umode_t __init ibft_check_tgt_for(void *data, int type) 531 { 532 struct ibft_kobject *entry = data; 533 struct ibft_tgt *tgt = entry->tgt; 534 umode_t rc = 0; 535 536 switch (type) { 537 case ISCSI_BOOT_TGT_INDEX: 538 case ISCSI_BOOT_TGT_FLAGS: 539 case ISCSI_BOOT_TGT_IP_ADDR: 540 case ISCSI_BOOT_TGT_PORT: 541 case ISCSI_BOOT_TGT_LUN: 542 case ISCSI_BOOT_TGT_NIC_ASSOC: 543 case ISCSI_BOOT_TGT_CHAP_TYPE: 544 rc = S_IRUGO; 545 case ISCSI_BOOT_TGT_NAME: 546 if (tgt->tgt_name_len) 547 rc = S_IRUGO; 548 break; 549 case ISCSI_BOOT_TGT_CHAP_NAME: 550 case ISCSI_BOOT_TGT_CHAP_SECRET: 551 if (tgt->chap_name_len) 552 rc = S_IRUGO; 553 break; 554 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 555 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 556 if (tgt->rev_chap_name_len) 557 rc = S_IRUGO; 558 break; 559 default: 560 break; 561 } 562 563 return rc; 564 } 565 566 static umode_t __init ibft_check_initiator_for(void *data, int type) 567 { 568 struct ibft_kobject *entry = data; 569 struct ibft_initiator *init = entry->initiator; 570 umode_t rc = 0; 571 572 switch (type) { 573 case ISCSI_BOOT_INI_INDEX: 574 case ISCSI_BOOT_INI_FLAGS: 575 rc = S_IRUGO; 576 break; 577 case ISCSI_BOOT_INI_ISNS_SERVER: 578 if (address_not_null(init->isns_server)) 579 rc = S_IRUGO; 580 break; 581 case ISCSI_BOOT_INI_SLP_SERVER: 582 if (address_not_null(init->slp_server)) 583 rc = S_IRUGO; 584 break; 585 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 586 if (address_not_null(init->pri_radius_server)) 587 rc = S_IRUGO; 588 break; 589 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 590 if (address_not_null(init->sec_radius_server)) 591 rc = S_IRUGO; 592 break; 593 case ISCSI_BOOT_INI_INITIATOR_NAME: 594 if (init->initiator_name_len) 595 rc = S_IRUGO; 596 break; 597 default: 598 break; 599 } 600 601 return rc; 602 } 603 604 static umode_t __init ibft_check_acpitbl_for(void *data, int type) 605 { 606 607 umode_t rc = 0; 608 609 switch (type) { 610 case ISCSI_BOOT_ACPITBL_SIGNATURE: 611 case ISCSI_BOOT_ACPITBL_OEM_ID: 612 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 613 rc = S_IRUGO; 614 break; 615 default: 616 break; 617 } 618 619 return rc; 620 } 621 622 static void ibft_kobj_release(void *data) 623 { 624 kfree(data); 625 } 626 627 /* 628 * Helper function for ibft_register_kobjects. 629 */ 630 static int __init ibft_create_kobject(struct acpi_table_ibft *header, 631 struct ibft_hdr *hdr) 632 { 633 struct iscsi_boot_kobj *boot_kobj = NULL; 634 struct ibft_kobject *ibft_kobj = NULL; 635 struct ibft_nic *nic = (struct ibft_nic *)hdr; 636 struct pci_dev *pci_dev; 637 int rc = 0; 638 639 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 640 if (!ibft_kobj) 641 return -ENOMEM; 642 643 ibft_kobj->header = header; 644 ibft_kobj->hdr = hdr; 645 646 switch (hdr->id) { 647 case id_initiator: 648 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 649 sizeof(*ibft_kobj->initiator)); 650 if (rc) 651 break; 652 653 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 654 ibft_kobj, 655 ibft_attr_show_initiator, 656 ibft_check_initiator_for, 657 ibft_kobj_release); 658 if (!boot_kobj) { 659 rc = -ENOMEM; 660 goto free_ibft_obj; 661 } 662 break; 663 case id_nic: 664 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 665 sizeof(*ibft_kobj->nic)); 666 if (rc) 667 break; 668 669 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 670 ibft_kobj, 671 ibft_attr_show_nic, 672 ibft_check_nic_for, 673 ibft_kobj_release); 674 if (!boot_kobj) { 675 rc = -ENOMEM; 676 goto free_ibft_obj; 677 } 678 break; 679 case id_target: 680 rc = ibft_verify_hdr("target", hdr, id_target, 681 sizeof(*ibft_kobj->tgt)); 682 if (rc) 683 break; 684 685 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 686 ibft_kobj, 687 ibft_attr_show_target, 688 ibft_check_tgt_for, 689 ibft_kobj_release); 690 if (!boot_kobj) { 691 rc = -ENOMEM; 692 goto free_ibft_obj; 693 } 694 break; 695 case id_reserved: 696 case id_control: 697 case id_extensions: 698 /* Fields which we don't support. Ignore them */ 699 rc = 1; 700 break; 701 default: 702 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 703 "Report this bug to %.6s!\n", hdr->id, 704 header->header.oem_id); 705 rc = 1; 706 break; 707 } 708 709 if (rc) { 710 /* Skip adding this kobject, but exit with non-fatal error. */ 711 rc = 0; 712 goto free_ibft_obj; 713 } 714 715 if (hdr->id == id_nic) { 716 /* 717 * We don't search for the device in other domains than 718 * zero. This is because on x86 platforms the BIOS 719 * executes only devices which are in domain 0. Furthermore, the 720 * iBFT spec doesn't have a domain id field :-( 721 */ 722 pci_dev = pci_get_domain_bus_and_slot(0, 723 (nic->pci_bdf & 0xff00) >> 8, 724 (nic->pci_bdf & 0xff)); 725 if (pci_dev) { 726 rc = sysfs_create_link(&boot_kobj->kobj, 727 &pci_dev->dev.kobj, "device"); 728 pci_dev_put(pci_dev); 729 } 730 } 731 return 0; 732 733 free_ibft_obj: 734 kfree(ibft_kobj); 735 return rc; 736 } 737 738 /* 739 * Scan the IBFT table structure for the NIC and Target fields. When 740 * found add them on the passed-in list. We do not support the other 741 * fields at this point, so they are skipped. 742 */ 743 static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 744 { 745 struct ibft_control *control = NULL; 746 struct iscsi_boot_kobj *boot_kobj; 747 struct ibft_kobject *ibft_kobj; 748 void *ptr, *end; 749 int rc = 0; 750 u16 offset; 751 u16 eot_offset; 752 753 control = (void *)header + sizeof(*header); 754 end = (void *)control + control->hdr.length; 755 eot_offset = (void *)header + header->header.length - (void *)control; 756 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 757 sizeof(*control)); 758 759 /* iBFT table safety checking */ 760 rc |= ((control->hdr.index) ? -ENODEV : 0); 761 if (rc) { 762 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 763 return rc; 764 } 765 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) { 766 offset = *(u16 *)ptr; 767 if (offset && offset < header->header.length && 768 offset < eot_offset) { 769 rc = ibft_create_kobject(header, 770 (void *)header + offset); 771 if (rc) 772 break; 773 } 774 } 775 if (rc) 776 return rc; 777 778 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 779 if (!ibft_kobj) 780 return -ENOMEM; 781 782 ibft_kobj->header = header; 783 ibft_kobj->hdr = NULL; /*for ibft_unregister*/ 784 785 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0, 786 ibft_kobj, 787 ibft_attr_show_acpitbl, 788 ibft_check_acpitbl_for, 789 ibft_kobj_release); 790 if (!boot_kobj) { 791 kfree(ibft_kobj); 792 rc = -ENOMEM; 793 } 794 795 return rc; 796 } 797 798 static void ibft_unregister(void) 799 { 800 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 801 struct ibft_kobject *ibft_kobj; 802 803 list_for_each_entry_safe(boot_kobj, tmp_kobj, 804 &boot_kset->kobj_list, list) { 805 ibft_kobj = boot_kobj->data; 806 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic) 807 sysfs_remove_link(&boot_kobj->kobj, "device"); 808 }; 809 } 810 811 static void ibft_cleanup(void) 812 { 813 if (boot_kset) { 814 ibft_unregister(); 815 iscsi_boot_destroy_kset(boot_kset); 816 } 817 } 818 819 static void __exit ibft_exit(void) 820 { 821 ibft_cleanup(); 822 } 823 824 #ifdef CONFIG_ACPI 825 static const struct { 826 char *sign; 827 } ibft_signs[] = { 828 /* 829 * One spec says "IBFT", the other says "iBFT". We have to check 830 * for both. 831 */ 832 { ACPI_SIG_IBFT }, 833 { "iBFT" }, 834 { "BIFT" }, /* Broadcom iSCSI Offload */ 835 }; 836 837 static void __init acpi_find_ibft_region(void) 838 { 839 int i; 840 struct acpi_table_header *table = NULL; 841 842 if (acpi_disabled) 843 return; 844 845 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 846 acpi_get_table(ibft_signs[i].sign, 0, &table); 847 ibft_addr = (struct acpi_table_ibft *)table; 848 } 849 } 850 #else 851 static void __init acpi_find_ibft_region(void) 852 { 853 } 854 #endif 855 856 /* 857 * ibft_init() - creates sysfs tree entries for the iBFT data. 858 */ 859 static int __init ibft_init(void) 860 { 861 int rc = 0; 862 863 /* 864 As on UEFI systems the setup_arch()/find_ibft_region() 865 is called before ACPI tables are parsed and it only does 866 legacy finding. 867 */ 868 if (!ibft_addr) 869 acpi_find_ibft_region(); 870 871 if (ibft_addr) { 872 pr_info("iBFT detected.\n"); 873 874 rc = ibft_check_device(); 875 if (rc) 876 return rc; 877 878 boot_kset = iscsi_boot_create_kset("ibft"); 879 if (!boot_kset) 880 return -ENOMEM; 881 882 /* Scan the IBFT for data and register the kobjects. */ 883 rc = ibft_register_kobjects(ibft_addr); 884 if (rc) 885 goto out_free; 886 } else 887 printk(KERN_INFO "No iBFT detected.\n"); 888 889 return 0; 890 891 out_free: 892 ibft_cleanup(); 893 return rc; 894 } 895 896 module_init(ibft_init); 897 module_exit(ibft_exit); 898