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 int __init ibft_check_device(void) 422 { 423 int len; 424 u8 *pos; 425 u8 csum = 0; 426 427 len = ibft_addr->header.length; 428 429 /* Sanity checking of iBFT. */ 430 if (ibft_addr->header.revision != 1) { 431 printk(KERN_ERR "iBFT module supports only revision 1, " \ 432 "while this is %d.\n", 433 ibft_addr->header.revision); 434 return -ENOENT; 435 } 436 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 437 csum += *pos; 438 439 if (csum) { 440 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 441 return -ENOENT; 442 } 443 444 return 0; 445 } 446 447 /* 448 * Helper routiners to check to determine if the entry is valid 449 * in the proper iBFT structure. 450 */ 451 static umode_t ibft_check_nic_for(void *data, int type) 452 { 453 struct ibft_kobject *entry = data; 454 struct ibft_nic *nic = entry->nic; 455 umode_t rc = 0; 456 457 switch (type) { 458 case ISCSI_BOOT_ETH_INDEX: 459 case ISCSI_BOOT_ETH_FLAGS: 460 rc = S_IRUGO; 461 break; 462 case ISCSI_BOOT_ETH_IP_ADDR: 463 if (address_not_null(nic->ip_addr)) 464 rc = S_IRUGO; 465 break; 466 case ISCSI_BOOT_ETH_PREFIX_LEN: 467 case ISCSI_BOOT_ETH_SUBNET_MASK: 468 if (nic->subnet_mask_prefix) 469 rc = S_IRUGO; 470 break; 471 case ISCSI_BOOT_ETH_ORIGIN: 472 rc = S_IRUGO; 473 break; 474 case ISCSI_BOOT_ETH_GATEWAY: 475 if (address_not_null(nic->gateway)) 476 rc = S_IRUGO; 477 break; 478 case ISCSI_BOOT_ETH_PRIMARY_DNS: 479 if (address_not_null(nic->primary_dns)) 480 rc = S_IRUGO; 481 break; 482 case ISCSI_BOOT_ETH_SECONDARY_DNS: 483 if (address_not_null(nic->secondary_dns)) 484 rc = S_IRUGO; 485 break; 486 case ISCSI_BOOT_ETH_DHCP: 487 if (address_not_null(nic->dhcp)) 488 rc = S_IRUGO; 489 break; 490 case ISCSI_BOOT_ETH_VLAN: 491 case ISCSI_BOOT_ETH_MAC: 492 rc = S_IRUGO; 493 break; 494 case ISCSI_BOOT_ETH_HOSTNAME: 495 if (nic->hostname_off) 496 rc = S_IRUGO; 497 break; 498 default: 499 break; 500 } 501 502 return rc; 503 } 504 505 static umode_t __init ibft_check_tgt_for(void *data, int type) 506 { 507 struct ibft_kobject *entry = data; 508 struct ibft_tgt *tgt = entry->tgt; 509 umode_t rc = 0; 510 511 switch (type) { 512 case ISCSI_BOOT_TGT_INDEX: 513 case ISCSI_BOOT_TGT_FLAGS: 514 case ISCSI_BOOT_TGT_IP_ADDR: 515 case ISCSI_BOOT_TGT_PORT: 516 case ISCSI_BOOT_TGT_LUN: 517 case ISCSI_BOOT_TGT_NIC_ASSOC: 518 case ISCSI_BOOT_TGT_CHAP_TYPE: 519 rc = S_IRUGO; 520 case ISCSI_BOOT_TGT_NAME: 521 if (tgt->tgt_name_len) 522 rc = S_IRUGO; 523 break; 524 case ISCSI_BOOT_TGT_CHAP_NAME: 525 case ISCSI_BOOT_TGT_CHAP_SECRET: 526 if (tgt->chap_name_len) 527 rc = S_IRUGO; 528 break; 529 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 530 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 531 if (tgt->rev_chap_name_len) 532 rc = S_IRUGO; 533 break; 534 default: 535 break; 536 } 537 538 return rc; 539 } 540 541 static umode_t __init ibft_check_initiator_for(void *data, int type) 542 { 543 struct ibft_kobject *entry = data; 544 struct ibft_initiator *init = entry->initiator; 545 umode_t rc = 0; 546 547 switch (type) { 548 case ISCSI_BOOT_INI_INDEX: 549 case ISCSI_BOOT_INI_FLAGS: 550 rc = S_IRUGO; 551 break; 552 case ISCSI_BOOT_INI_ISNS_SERVER: 553 if (address_not_null(init->isns_server)) 554 rc = S_IRUGO; 555 break; 556 case ISCSI_BOOT_INI_SLP_SERVER: 557 if (address_not_null(init->slp_server)) 558 rc = S_IRUGO; 559 break; 560 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 561 if (address_not_null(init->pri_radius_server)) 562 rc = S_IRUGO; 563 break; 564 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 565 if (address_not_null(init->sec_radius_server)) 566 rc = S_IRUGO; 567 break; 568 case ISCSI_BOOT_INI_INITIATOR_NAME: 569 if (init->initiator_name_len) 570 rc = S_IRUGO; 571 break; 572 default: 573 break; 574 } 575 576 return rc; 577 } 578 579 static void ibft_kobj_release(void *data) 580 { 581 kfree(data); 582 } 583 584 /* 585 * Helper function for ibft_register_kobjects. 586 */ 587 static int __init ibft_create_kobject(struct acpi_table_ibft *header, 588 struct ibft_hdr *hdr) 589 { 590 struct iscsi_boot_kobj *boot_kobj = NULL; 591 struct ibft_kobject *ibft_kobj = NULL; 592 struct ibft_nic *nic = (struct ibft_nic *)hdr; 593 struct pci_dev *pci_dev; 594 int rc = 0; 595 596 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 597 if (!ibft_kobj) 598 return -ENOMEM; 599 600 ibft_kobj->header = header; 601 ibft_kobj->hdr = hdr; 602 603 switch (hdr->id) { 604 case id_initiator: 605 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 606 sizeof(*ibft_kobj->initiator)); 607 if (rc) 608 break; 609 610 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 611 ibft_kobj, 612 ibft_attr_show_initiator, 613 ibft_check_initiator_for, 614 ibft_kobj_release); 615 if (!boot_kobj) { 616 rc = -ENOMEM; 617 goto free_ibft_obj; 618 } 619 break; 620 case id_nic: 621 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 622 sizeof(*ibft_kobj->nic)); 623 if (rc) 624 break; 625 626 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 627 ibft_kobj, 628 ibft_attr_show_nic, 629 ibft_check_nic_for, 630 ibft_kobj_release); 631 if (!boot_kobj) { 632 rc = -ENOMEM; 633 goto free_ibft_obj; 634 } 635 break; 636 case id_target: 637 rc = ibft_verify_hdr("target", hdr, id_target, 638 sizeof(*ibft_kobj->tgt)); 639 if (rc) 640 break; 641 642 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 643 ibft_kobj, 644 ibft_attr_show_target, 645 ibft_check_tgt_for, 646 ibft_kobj_release); 647 if (!boot_kobj) { 648 rc = -ENOMEM; 649 goto free_ibft_obj; 650 } 651 break; 652 case id_reserved: 653 case id_control: 654 case id_extensions: 655 /* Fields which we don't support. Ignore them */ 656 rc = 1; 657 break; 658 default: 659 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 660 "Report this bug to %.6s!\n", hdr->id, 661 header->header.oem_id); 662 rc = 1; 663 break; 664 } 665 666 if (rc) { 667 /* Skip adding this kobject, but exit with non-fatal error. */ 668 rc = 0; 669 goto free_ibft_obj; 670 } 671 672 if (hdr->id == id_nic) { 673 /* 674 * We don't search for the device in other domains than 675 * zero. This is because on x86 platforms the BIOS 676 * executes only devices which are in domain 0. Furthermore, the 677 * iBFT spec doesn't have a domain id field :-( 678 */ 679 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8, 680 (nic->pci_bdf & 0xff)); 681 if (pci_dev) { 682 rc = sysfs_create_link(&boot_kobj->kobj, 683 &pci_dev->dev.kobj, "device"); 684 pci_dev_put(pci_dev); 685 } 686 } 687 return 0; 688 689 free_ibft_obj: 690 kfree(ibft_kobj); 691 return rc; 692 } 693 694 /* 695 * Scan the IBFT table structure for the NIC and Target fields. When 696 * found add them on the passed-in list. We do not support the other 697 * fields at this point, so they are skipped. 698 */ 699 static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 700 { 701 struct ibft_control *control = NULL; 702 void *ptr, *end; 703 int rc = 0; 704 u16 offset; 705 u16 eot_offset; 706 707 control = (void *)header + sizeof(*header); 708 end = (void *)control + control->hdr.length; 709 eot_offset = (void *)header + header->header.length - (void *)control; 710 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 711 sizeof(*control)); 712 713 /* iBFT table safety checking */ 714 rc |= ((control->hdr.index) ? -ENODEV : 0); 715 if (rc) { 716 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 717 return rc; 718 } 719 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) { 720 offset = *(u16 *)ptr; 721 if (offset && offset < header->header.length && 722 offset < eot_offset) { 723 rc = ibft_create_kobject(header, 724 (void *)header + offset); 725 if (rc) 726 break; 727 } 728 } 729 730 return rc; 731 } 732 733 static void ibft_unregister(void) 734 { 735 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 736 struct ibft_kobject *ibft_kobj; 737 738 list_for_each_entry_safe(boot_kobj, tmp_kobj, 739 &boot_kset->kobj_list, list) { 740 ibft_kobj = boot_kobj->data; 741 if (ibft_kobj->hdr->id == id_nic) 742 sysfs_remove_link(&boot_kobj->kobj, "device"); 743 }; 744 } 745 746 static void ibft_cleanup(void) 747 { 748 if (boot_kset) { 749 ibft_unregister(); 750 iscsi_boot_destroy_kset(boot_kset); 751 } 752 } 753 754 static void __exit ibft_exit(void) 755 { 756 ibft_cleanup(); 757 } 758 759 #ifdef CONFIG_ACPI 760 static const struct { 761 char *sign; 762 } ibft_signs[] = { 763 /* 764 * One spec says "IBFT", the other says "iBFT". We have to check 765 * for both. 766 */ 767 { ACPI_SIG_IBFT }, 768 { "iBFT" }, 769 { "BIFT" }, /* Broadcom iSCSI Offload */ 770 }; 771 772 static void __init acpi_find_ibft_region(void) 773 { 774 int i; 775 struct acpi_table_header *table = NULL; 776 777 if (acpi_disabled) 778 return; 779 780 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 781 acpi_get_table(ibft_signs[i].sign, 0, &table); 782 ibft_addr = (struct acpi_table_ibft *)table; 783 } 784 } 785 #else 786 static void __init acpi_find_ibft_region(void) 787 { 788 } 789 #endif 790 791 /* 792 * ibft_init() - creates sysfs tree entries for the iBFT data. 793 */ 794 static int __init ibft_init(void) 795 { 796 int rc = 0; 797 798 /* 799 As on UEFI systems the setup_arch()/find_ibft_region() 800 is called before ACPI tables are parsed and it only does 801 legacy finding. 802 */ 803 if (!ibft_addr) 804 acpi_find_ibft_region(); 805 806 if (ibft_addr) { 807 pr_info("iBFT detected.\n"); 808 809 rc = ibft_check_device(); 810 if (rc) 811 return rc; 812 813 boot_kset = iscsi_boot_create_kset("ibft"); 814 if (!boot_kset) 815 return -ENOMEM; 816 817 /* Scan the IBFT for data and register the kobjects. */ 818 rc = ibft_register_kobjects(ibft_addr); 819 if (rc) 820 goto out_free; 821 } else 822 printk(KERN_INFO "No iBFT detected.\n"); 823 824 return 0; 825 826 out_free: 827 ibft_cleanup(); 828 return rc; 829 } 830 831 module_init(ibft_init); 832 module_exit(ibft_exit); 833