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 90MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and " 91 "Konrad Rzeszutek <ketuzsezr@darnok.org>"); 92MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information"); 93MODULE_LICENSE("GPL"); 94MODULE_VERSION(IBFT_ISCSI_VERSION); 95 96struct ibft_hdr { 97 u8 id; 98 u8 version; 99 u16 length; 100 u8 index; 101 u8 flags; 102} __attribute__((__packed__)); 103 104struct 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 114struct 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 124struct 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 140struct 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*/ 163enum 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 177struct 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 187static struct iscsi_boot_kset *boot_kset; 188 189/* fully null address */ 190static const char nulls[16]; 191 192/* IPv4-mapped IPv6 ::ffff:0.0.0.0 */ 193static 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 198static 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 */ 206static 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 227static 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 */ 235static 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 */ 256static 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 297static 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_ORIGIN: 323 str += sprintf(str, "%d\n", nic->origin); 324 break; 325 case ISCSI_BOOT_ETH_GATEWAY: 326 str += sprintf_ipaddr(str, nic->gateway); 327 break; 328 case ISCSI_BOOT_ETH_PRIMARY_DNS: 329 str += sprintf_ipaddr(str, nic->primary_dns); 330 break; 331 case ISCSI_BOOT_ETH_SECONDARY_DNS: 332 str += sprintf_ipaddr(str, nic->secondary_dns); 333 break; 334 case ISCSI_BOOT_ETH_DHCP: 335 str += sprintf_ipaddr(str, nic->dhcp); 336 break; 337 case ISCSI_BOOT_ETH_VLAN: 338 str += sprintf(str, "%d\n", nic->vlan); 339 break; 340 case ISCSI_BOOT_ETH_MAC: 341 str += sprintf(str, "%pM\n", nic->mac); 342 break; 343 case ISCSI_BOOT_ETH_HOSTNAME: 344 str += sprintf_string(str, nic->hostname_len, 345 (char *)ibft_loc + nic->hostname_off); 346 break; 347 default: 348 break; 349 } 350 351 return str - buf; 352}; 353 354static ssize_t ibft_attr_show_target(void *data, int type, char *buf) 355{ 356 struct ibft_kobject *entry = data; 357 struct ibft_tgt *tgt = entry->tgt; 358 void *ibft_loc = entry->header; 359 char *str = buf; 360 int i; 361 362 if (!tgt) 363 return 0; 364 365 switch (type) { 366 case ISCSI_BOOT_TGT_INDEX: 367 str += sprintf(str, "%d\n", tgt->hdr.index); 368 break; 369 case ISCSI_BOOT_TGT_FLAGS: 370 str += sprintf(str, "%d\n", tgt->hdr.flags); 371 break; 372 case ISCSI_BOOT_TGT_IP_ADDR: 373 str += sprintf_ipaddr(str, tgt->ip_addr); 374 break; 375 case ISCSI_BOOT_TGT_PORT: 376 str += sprintf(str, "%d\n", tgt->port); 377 break; 378 case ISCSI_BOOT_TGT_LUN: 379 for (i = 0; i < 8; i++) 380 str += sprintf(str, "%x", (u8)tgt->lun[i]); 381 str += sprintf(str, "\n"); 382 break; 383 case ISCSI_BOOT_TGT_NIC_ASSOC: 384 str += sprintf(str, "%d\n", tgt->nic_assoc); 385 break; 386 case ISCSI_BOOT_TGT_CHAP_TYPE: 387 str += sprintf(str, "%d\n", tgt->chap_type); 388 break; 389 case ISCSI_BOOT_TGT_NAME: 390 str += sprintf_string(str, tgt->tgt_name_len, 391 (char *)ibft_loc + tgt->tgt_name_off); 392 break; 393 case ISCSI_BOOT_TGT_CHAP_NAME: 394 str += sprintf_string(str, tgt->chap_name_len, 395 (char *)ibft_loc + tgt->chap_name_off); 396 break; 397 case ISCSI_BOOT_TGT_CHAP_SECRET: 398 str += sprintf_string(str, tgt->chap_secret_len, 399 (char *)ibft_loc + tgt->chap_secret_off); 400 break; 401 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 402 str += sprintf_string(str, tgt->rev_chap_name_len, 403 (char *)ibft_loc + 404 tgt->rev_chap_name_off); 405 break; 406 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 407 str += sprintf_string(str, tgt->rev_chap_secret_len, 408 (char *)ibft_loc + 409 tgt->rev_chap_secret_off); 410 break; 411 default: 412 break; 413 } 414 415 return str - buf; 416} 417 418static int __init ibft_check_device(void) 419{ 420 int len; 421 u8 *pos; 422 u8 csum = 0; 423 424 len = ibft_addr->header.length; 425 426 /* Sanity checking of iBFT. */ 427 if (ibft_addr->header.revision != 1) { 428 printk(KERN_ERR "iBFT module supports only revision 1, " \ 429 "while this is %d.\n", 430 ibft_addr->header.revision); 431 return -ENOENT; 432 } 433 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 434 csum += *pos; 435 436 if (csum) { 437 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 438 return -ENOENT; 439 } 440 441 return 0; 442} 443 444/* 445 * Helper routiners to check to determine if the entry is valid 446 * in the proper iBFT structure. 447 */ 448static umode_t ibft_check_nic_for(void *data, int type) 449{ 450 struct ibft_kobject *entry = data; 451 struct ibft_nic *nic = entry->nic; 452 umode_t rc = 0; 453 454 switch (type) { 455 case ISCSI_BOOT_ETH_INDEX: 456 case ISCSI_BOOT_ETH_FLAGS: 457 rc = S_IRUGO; 458 break; 459 case ISCSI_BOOT_ETH_IP_ADDR: 460 if (address_not_null(nic->ip_addr)) 461 rc = S_IRUGO; 462 break; 463 case ISCSI_BOOT_ETH_SUBNET_MASK: 464 if (nic->subnet_mask_prefix) 465 rc = S_IRUGO; 466 break; 467 case ISCSI_BOOT_ETH_ORIGIN: 468 rc = S_IRUGO; 469 break; 470 case ISCSI_BOOT_ETH_GATEWAY: 471 if (address_not_null(nic->gateway)) 472 rc = S_IRUGO; 473 break; 474 case ISCSI_BOOT_ETH_PRIMARY_DNS: 475 if (address_not_null(nic->primary_dns)) 476 rc = S_IRUGO; 477 break; 478 case ISCSI_BOOT_ETH_SECONDARY_DNS: 479 if (address_not_null(nic->secondary_dns)) 480 rc = S_IRUGO; 481 break; 482 case ISCSI_BOOT_ETH_DHCP: 483 if (address_not_null(nic->dhcp)) 484 rc = S_IRUGO; 485 break; 486 case ISCSI_BOOT_ETH_VLAN: 487 case ISCSI_BOOT_ETH_MAC: 488 rc = S_IRUGO; 489 break; 490 case ISCSI_BOOT_ETH_HOSTNAME: 491 if (nic->hostname_off) 492 rc = S_IRUGO; 493 break; 494 default: 495 break; 496 } 497 498 return rc; 499} 500 501static umode_t __init ibft_check_tgt_for(void *data, int type) 502{ 503 struct ibft_kobject *entry = data; 504 struct ibft_tgt *tgt = entry->tgt; 505 umode_t rc = 0; 506 507 switch (type) { 508 case ISCSI_BOOT_TGT_INDEX: 509 case ISCSI_BOOT_TGT_FLAGS: 510 case ISCSI_BOOT_TGT_IP_ADDR: 511 case ISCSI_BOOT_TGT_PORT: 512 case ISCSI_BOOT_TGT_LUN: 513 case ISCSI_BOOT_TGT_NIC_ASSOC: 514 case ISCSI_BOOT_TGT_CHAP_TYPE: 515 rc = S_IRUGO; 516 case ISCSI_BOOT_TGT_NAME: 517 if (tgt->tgt_name_len) 518 rc = S_IRUGO; 519 break; 520 case ISCSI_BOOT_TGT_CHAP_NAME: 521 case ISCSI_BOOT_TGT_CHAP_SECRET: 522 if (tgt->chap_name_len) 523 rc = S_IRUGO; 524 break; 525 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 526 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 527 if (tgt->rev_chap_name_len) 528 rc = S_IRUGO; 529 break; 530 default: 531 break; 532 } 533 534 return rc; 535} 536 537static umode_t __init ibft_check_initiator_for(void *data, int type) 538{ 539 struct ibft_kobject *entry = data; 540 struct ibft_initiator *init = entry->initiator; 541 umode_t rc = 0; 542 543 switch (type) { 544 case ISCSI_BOOT_INI_INDEX: 545 case ISCSI_BOOT_INI_FLAGS: 546 rc = S_IRUGO; 547 break; 548 case ISCSI_BOOT_INI_ISNS_SERVER: 549 if (address_not_null(init->isns_server)) 550 rc = S_IRUGO; 551 break; 552 case ISCSI_BOOT_INI_SLP_SERVER: 553 if (address_not_null(init->slp_server)) 554 rc = S_IRUGO; 555 break; 556 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 557 if (address_not_null(init->pri_radius_server)) 558 rc = S_IRUGO; 559 break; 560 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 561 if (address_not_null(init->sec_radius_server)) 562 rc = S_IRUGO; 563 break; 564 case ISCSI_BOOT_INI_INITIATOR_NAME: 565 if (init->initiator_name_len) 566 rc = S_IRUGO; 567 break; 568 default: 569 break; 570 } 571 572 return rc; 573} 574 575static void ibft_kobj_release(void *data) 576{ 577 kfree(data); 578} 579 580/* 581 * Helper function for ibft_register_kobjects. 582 */ 583static int __init ibft_create_kobject(struct acpi_table_ibft *header, 584 struct ibft_hdr *hdr) 585{ 586 struct iscsi_boot_kobj *boot_kobj = NULL; 587 struct ibft_kobject *ibft_kobj = NULL; 588 struct ibft_nic *nic = (struct ibft_nic *)hdr; 589 struct pci_dev *pci_dev; 590 int rc = 0; 591 592 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 593 if (!ibft_kobj) 594 return -ENOMEM; 595 596 ibft_kobj->header = header; 597 ibft_kobj->hdr = hdr; 598 599 switch (hdr->id) { 600 case id_initiator: 601 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 602 sizeof(*ibft_kobj->initiator)); 603 if (rc) 604 break; 605 606 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 607 ibft_kobj, 608 ibft_attr_show_initiator, 609 ibft_check_initiator_for, 610 ibft_kobj_release); 611 if (!boot_kobj) { 612 rc = -ENOMEM; 613 goto free_ibft_obj; 614 } 615 break; 616 case id_nic: 617 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 618 sizeof(*ibft_kobj->nic)); 619 if (rc) 620 break; 621 622 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 623 ibft_kobj, 624 ibft_attr_show_nic, 625 ibft_check_nic_for, 626 ibft_kobj_release); 627 if (!boot_kobj) { 628 rc = -ENOMEM; 629 goto free_ibft_obj; 630 } 631 break; 632 case id_target: 633 rc = ibft_verify_hdr("target", hdr, id_target, 634 sizeof(*ibft_kobj->tgt)); 635 if (rc) 636 break; 637 638 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 639 ibft_kobj, 640 ibft_attr_show_target, 641 ibft_check_tgt_for, 642 ibft_kobj_release); 643 if (!boot_kobj) { 644 rc = -ENOMEM; 645 goto free_ibft_obj; 646 } 647 break; 648 case id_reserved: 649 case id_control: 650 case id_extensions: 651 /* Fields which we don't support. Ignore them */ 652 rc = 1; 653 break; 654 default: 655 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 656 "Report this bug to %.6s!\n", hdr->id, 657 header->header.oem_id); 658 rc = 1; 659 break; 660 } 661 662 if (rc) { 663 /* Skip adding this kobject, but exit with non-fatal error. */ 664 rc = 0; 665 goto free_ibft_obj; 666 } 667 668 if (hdr->id == id_nic) { 669 /* 670 * We don't search for the device in other domains than 671 * zero. This is because on x86 platforms the BIOS 672 * executes only devices which are in domain 0. Furthermore, the 673 * iBFT spec doesn't have a domain id field :-( 674 */ 675 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8, 676 (nic->pci_bdf & 0xff)); 677 if (pci_dev) { 678 rc = sysfs_create_link(&boot_kobj->kobj, 679 &pci_dev->dev.kobj, "device"); 680 pci_dev_put(pci_dev); 681 } 682 } 683 return 0; 684 685free_ibft_obj: 686 kfree(ibft_kobj); 687 return rc; 688} 689 690/* 691 * Scan the IBFT table structure for the NIC and Target fields. When 692 * found add them on the passed-in list. We do not support the other 693 * fields at this point, so they are skipped. 694 */ 695static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 696{ 697 struct ibft_control *control = NULL; 698 void *ptr, *end; 699 int rc = 0; 700 u16 offset; 701 u16 eot_offset; 702 703 control = (void *)header + sizeof(*header); 704 end = (void *)control + control->hdr.length; 705 eot_offset = (void *)header + header->header.length - (void *)control; 706 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 707 sizeof(*control)); 708 709 /* iBFT table safety checking */ 710 rc |= ((control->hdr.index) ? -ENODEV : 0); 711 if (rc) { 712 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 713 return rc; 714 } 715 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) { 716 offset = *(u16 *)ptr; 717 if (offset && offset < header->header.length && 718 offset < eot_offset) { 719 rc = ibft_create_kobject(header, 720 (void *)header + offset); 721 if (rc) 722 break; 723 } 724 } 725 726 return rc; 727} 728 729static void ibft_unregister(void) 730{ 731 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 732 struct ibft_kobject *ibft_kobj; 733 734 list_for_each_entry_safe(boot_kobj, tmp_kobj, 735 &boot_kset->kobj_list, list) { 736 ibft_kobj = boot_kobj->data; 737 if (ibft_kobj->hdr->id == id_nic) 738 sysfs_remove_link(&boot_kobj->kobj, "device"); 739 }; 740} 741 742static void ibft_cleanup(void) 743{ 744 if (boot_kset) { 745 ibft_unregister(); 746 iscsi_boot_destroy_kset(boot_kset); 747 } 748} 749 750static void __exit ibft_exit(void) 751{ 752 ibft_cleanup(); 753} 754 755#ifdef CONFIG_ACPI 756static const struct { 757 char *sign; 758} ibft_signs[] = { 759 /* 760 * One spec says "IBFT", the other says "iBFT". We have to check 761 * for both. 762 */ 763 { ACPI_SIG_IBFT }, 764 { "iBFT" }, 765 { "BIFT" }, /* Broadcom iSCSI Offload */ 766}; 767 768static void __init acpi_find_ibft_region(void) 769{ 770 int i; 771 struct acpi_table_header *table = NULL; 772 773 if (acpi_disabled) 774 return; 775 776 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 777 acpi_get_table(ibft_signs[i].sign, 0, &table); 778 ibft_addr = (struct acpi_table_ibft *)table; 779 } 780} 781#else 782static void __init acpi_find_ibft_region(void) 783{ 784} 785#endif 786 787/* 788 * ibft_init() - creates sysfs tree entries for the iBFT data. 789 */ 790static int __init ibft_init(void) 791{ 792 int rc = 0; 793 794 /* 795 As on UEFI systems the setup_arch()/find_ibft_region() 796 is called before ACPI tables are parsed and it only does 797 legacy finding. 798 */ 799 if (!ibft_addr) 800 acpi_find_ibft_region(); 801 802 if (ibft_addr) { 803 pr_info("iBFT detected.\n"); 804 805 rc = ibft_check_device(); 806 if (rc) 807 return rc; 808 809 boot_kset = iscsi_boot_create_kset("ibft"); 810 if (!boot_kset) 811 return -ENOMEM; 812 813 /* Scan the IBFT for data and register the kobjects. */ 814 rc = ibft_register_kobjects(ibft_addr); 815 if (rc) 816 goto out_free; 817 } else 818 printk(KERN_INFO "No iBFT detected.\n"); 819 820 return 0; 821 822out_free: 823 ibft_cleanup(); 824 return rc; 825} 826 827module_init(ibft_init); 828module_exit(ibft_exit); 829