1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright 2007-2010 Red Hat, Inc. 4 * by Peter Jones <pjones@redhat.com> 5 * Copyright 2008 IBM, Inc. 6 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 7 * Copyright 2008 8 * by Konrad Rzeszutek <ketuzsezr@darnok.org> 9 * 10 * This code exposes the iSCSI Boot Format Table to userland via sysfs. 11 * 12 * Changelog: 13 * 14 * 06 Jan 2010 - Peter Jones <pjones@redhat.com> 15 * New changelog entries are in the git log from now on. Not here. 16 * 17 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org> 18 * Updated comments and copyrights. (v0.4.9) 19 * 20 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 21 * Converted to using ibft_addr. (v0.4.8) 22 * 23 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 24 * Combined two functions in one: reserve_ibft_region. (v0.4.7) 25 * 26 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 27 * Added logic to handle IPv6 addresses. (v0.4.6) 28 * 29 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 30 * Added logic to handle badly not-to-spec iBFT. (v0.4.5) 31 * 32 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 33 * Added __init to function declarations. (v0.4.4) 34 * 35 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 36 * Updated kobject registration, combined unregister functions in one 37 * and code and style cleanup. (v0.4.3) 38 * 39 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 40 * Added end-markers to enums and re-organized kobject registration. (v0.4.2) 41 * 42 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 43 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1) 44 * 45 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 46 * Added sysfs-ibft documentation, moved 'find_ibft' function to 47 * in its own file and added text attributes for every struct field. (v0.4) 48 * 49 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 50 * Added text attributes emulating OpenFirmware /proc/device-tree naming. 51 * Removed binary /sysfs interface (v0.3) 52 * 53 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 54 * Added functionality in setup.c to reserve iBFT region. (v0.2) 55 * 56 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 57 * First version exposing iBFT data via a binary /sysfs. (v0.1) 58 */ 59 60 61#include <linux/blkdev.h> 62#include <linux/capability.h> 63#include <linux/ctype.h> 64#include <linux/device.h> 65#include <linux/err.h> 66#include <linux/init.h> 67#include <linux/iscsi_ibft.h> 68#include <linux/limits.h> 69#include <linux/module.h> 70#include <linux/pci.h> 71#include <linux/slab.h> 72#include <linux/stat.h> 73#include <linux/string.h> 74#include <linux/types.h> 75#include <linux/acpi.h> 76#include <linux/iscsi_boot_sysfs.h> 77 78#define IBFT_ISCSI_VERSION "0.5.0" 79#define IBFT_ISCSI_DATE "2010-Feb-25" 80 81MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and " 82 "Konrad Rzeszutek <ketuzsezr@darnok.org>"); 83MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information"); 84MODULE_LICENSE("GPL"); 85MODULE_VERSION(IBFT_ISCSI_VERSION); 86 87static struct acpi_table_ibft *ibft_addr; 88 89struct ibft_hdr { 90 u8 id; 91 u8 version; 92 u16 length; 93 u8 index; 94 u8 flags; 95} __attribute__((__packed__)); 96 97struct ibft_control { 98 struct ibft_hdr hdr; 99 u16 extensions; 100 u16 initiator_off; 101 u16 nic0_off; 102 u16 tgt0_off; 103 u16 nic1_off; 104 u16 tgt1_off; 105 u16 expansion[]; 106} __attribute__((__packed__)); 107 108struct ibft_initiator { 109 struct ibft_hdr hdr; 110 char isns_server[16]; 111 char slp_server[16]; 112 char pri_radius_server[16]; 113 char sec_radius_server[16]; 114 u16 initiator_name_len; 115 u16 initiator_name_off; 116} __attribute__((__packed__)); 117 118struct ibft_nic { 119 struct ibft_hdr hdr; 120 char ip_addr[16]; 121 u8 subnet_mask_prefix; 122 u8 origin; 123 char gateway[16]; 124 char primary_dns[16]; 125 char secondary_dns[16]; 126 char dhcp[16]; 127 u16 vlan; 128 char mac[6]; 129 u16 pci_bdf; 130 u16 hostname_len; 131 u16 hostname_off; 132} __attribute__((__packed__)); 133 134struct ibft_tgt { 135 struct ibft_hdr hdr; 136 char ip_addr[16]; 137 u16 port; 138 char lun[8]; 139 u8 chap_type; 140 u8 nic_assoc; 141 u16 tgt_name_len; 142 u16 tgt_name_off; 143 u16 chap_name_len; 144 u16 chap_name_off; 145 u16 chap_secret_len; 146 u16 chap_secret_off; 147 u16 rev_chap_name_len; 148 u16 rev_chap_name_off; 149 u16 rev_chap_secret_len; 150 u16 rev_chap_secret_off; 151} __attribute__((__packed__)); 152 153/* 154 * The kobject different types and its names. 155 * 156*/ 157enum ibft_id { 158 id_reserved = 0, /* We don't support. */ 159 id_control = 1, /* Should show up only once and is not exported. */ 160 id_initiator = 2, 161 id_nic = 3, 162 id_target = 4, 163 id_extensions = 5, /* We don't support. */ 164 id_end_marker, 165}; 166 167/* 168 * The kobject and attribute structures. 169 */ 170 171struct ibft_kobject { 172 struct acpi_table_ibft *header; 173 union { 174 struct ibft_initiator *initiator; 175 struct ibft_nic *nic; 176 struct ibft_tgt *tgt; 177 struct ibft_hdr *hdr; 178 }; 179}; 180 181static struct iscsi_boot_kset *boot_kset; 182 183/* fully null address */ 184static const char nulls[16]; 185 186/* IPv4-mapped IPv6 ::ffff:0.0.0.0 */ 187static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00, 188 0x00, 0x00, 0x00, 0x00, 189 0x00, 0x00, 0xff, 0xff, 190 0x00, 0x00, 0x00, 0x00 }; 191 192static int address_not_null(u8 *ip) 193{ 194 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16)); 195} 196 197/* 198 * Helper functions to parse data properly. 199 */ 200static ssize_t sprintf_ipaddr(char *buf, u8 *ip) 201{ 202 char *str = buf; 203 204 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 && 205 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 && 206 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) { 207 /* 208 * IPV4 209 */ 210 str += sprintf(buf, "%pI4", ip + 12); 211 } else { 212 /* 213 * IPv6 214 */ 215 str += sprintf(str, "%pI6", ip); 216 } 217 str += sprintf(str, "\n"); 218 return str - buf; 219} 220 221static ssize_t sprintf_string(char *str, int len, char *buf) 222{ 223 return sprintf(str, "%.*s\n", len, buf); 224} 225 226/* 227 * Helper function to verify the IBFT header. 228 */ 229static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length) 230{ 231 if (hdr->id != id) { 232 printk(KERN_ERR "iBFT error: We expected the %s " \ 233 "field header.id to have %d but " \ 234 "found %d instead!\n", t, id, hdr->id); 235 return -ENODEV; 236 } 237 if (length && hdr->length != length) { 238 printk(KERN_ERR "iBFT error: We expected the %s " \ 239 "field header.length to have %d but " \ 240 "found %d instead!\n", t, length, hdr->length); 241 return -ENODEV; 242 } 243 244 return 0; 245} 246 247/* 248 * Routines for parsing the iBFT data to be human readable. 249 */ 250static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf) 251{ 252 struct ibft_kobject *entry = data; 253 struct ibft_initiator *initiator = entry->initiator; 254 void *ibft_loc = entry->header; 255 char *str = buf; 256 257 if (!initiator) 258 return 0; 259 260 switch (type) { 261 case ISCSI_BOOT_INI_INDEX: 262 str += sprintf(str, "%d\n", initiator->hdr.index); 263 break; 264 case ISCSI_BOOT_INI_FLAGS: 265 str += sprintf(str, "%d\n", initiator->hdr.flags); 266 break; 267 case ISCSI_BOOT_INI_ISNS_SERVER: 268 str += sprintf_ipaddr(str, initiator->isns_server); 269 break; 270 case ISCSI_BOOT_INI_SLP_SERVER: 271 str += sprintf_ipaddr(str, initiator->slp_server); 272 break; 273 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 274 str += sprintf_ipaddr(str, initiator->pri_radius_server); 275 break; 276 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 277 str += sprintf_ipaddr(str, initiator->sec_radius_server); 278 break; 279 case ISCSI_BOOT_INI_INITIATOR_NAME: 280 str += sprintf_string(str, initiator->initiator_name_len, 281 (char *)ibft_loc + 282 initiator->initiator_name_off); 283 break; 284 default: 285 break; 286 } 287 288 return str - buf; 289} 290 291static ssize_t ibft_attr_show_nic(void *data, int type, char *buf) 292{ 293 struct ibft_kobject *entry = data; 294 struct ibft_nic *nic = entry->nic; 295 void *ibft_loc = entry->header; 296 char *str = buf; 297 __be32 val; 298 299 if (!nic) 300 return 0; 301 302 switch (type) { 303 case ISCSI_BOOT_ETH_INDEX: 304 str += sprintf(str, "%d\n", nic->hdr.index); 305 break; 306 case ISCSI_BOOT_ETH_FLAGS: 307 str += sprintf(str, "%d\n", nic->hdr.flags); 308 break; 309 case ISCSI_BOOT_ETH_IP_ADDR: 310 str += sprintf_ipaddr(str, nic->ip_addr); 311 break; 312 case ISCSI_BOOT_ETH_SUBNET_MASK: 313 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); 314 str += sprintf(str, "%pI4", &val); 315 break; 316 case ISCSI_BOOT_ETH_PREFIX_LEN: 317 str += sprintf(str, "%d\n", nic->subnet_mask_prefix); 318 break; 319 case ISCSI_BOOT_ETH_ORIGIN: 320 str += sprintf(str, "%d\n", nic->origin); 321 break; 322 case ISCSI_BOOT_ETH_GATEWAY: 323 str += sprintf_ipaddr(str, nic->gateway); 324 break; 325 case ISCSI_BOOT_ETH_PRIMARY_DNS: 326 str += sprintf_ipaddr(str, nic->primary_dns); 327 break; 328 case ISCSI_BOOT_ETH_SECONDARY_DNS: 329 str += sprintf_ipaddr(str, nic->secondary_dns); 330 break; 331 case ISCSI_BOOT_ETH_DHCP: 332 str += sprintf_ipaddr(str, nic->dhcp); 333 break; 334 case ISCSI_BOOT_ETH_VLAN: 335 str += sprintf(str, "%d\n", nic->vlan); 336 break; 337 case ISCSI_BOOT_ETH_MAC: 338 str += sprintf(str, "%pM\n", nic->mac); 339 break; 340 case ISCSI_BOOT_ETH_HOSTNAME: 341 str += sprintf_string(str, nic->hostname_len, 342 (char *)ibft_loc + nic->hostname_off); 343 break; 344 default: 345 break; 346 } 347 348 return str - buf; 349}; 350 351static ssize_t ibft_attr_show_target(void *data, int type, char *buf) 352{ 353 struct ibft_kobject *entry = data; 354 struct ibft_tgt *tgt = entry->tgt; 355 void *ibft_loc = entry->header; 356 char *str = buf; 357 int i; 358 359 if (!tgt) 360 return 0; 361 362 switch (type) { 363 case ISCSI_BOOT_TGT_INDEX: 364 str += sprintf(str, "%d\n", tgt->hdr.index); 365 break; 366 case ISCSI_BOOT_TGT_FLAGS: 367 str += sprintf(str, "%d\n", tgt->hdr.flags); 368 break; 369 case ISCSI_BOOT_TGT_IP_ADDR: 370 str += sprintf_ipaddr(str, tgt->ip_addr); 371 break; 372 case ISCSI_BOOT_TGT_PORT: 373 str += sprintf(str, "%d\n", tgt->port); 374 break; 375 case ISCSI_BOOT_TGT_LUN: 376 for (i = 0; i < 8; i++) 377 str += sprintf(str, "%x", (u8)tgt->lun[i]); 378 str += sprintf(str, "\n"); 379 break; 380 case ISCSI_BOOT_TGT_NIC_ASSOC: 381 str += sprintf(str, "%d\n", tgt->nic_assoc); 382 break; 383 case ISCSI_BOOT_TGT_CHAP_TYPE: 384 str += sprintf(str, "%d\n", tgt->chap_type); 385 break; 386 case ISCSI_BOOT_TGT_NAME: 387 str += sprintf_string(str, tgt->tgt_name_len, 388 (char *)ibft_loc + tgt->tgt_name_off); 389 break; 390 case ISCSI_BOOT_TGT_CHAP_NAME: 391 str += sprintf_string(str, tgt->chap_name_len, 392 (char *)ibft_loc + tgt->chap_name_off); 393 break; 394 case ISCSI_BOOT_TGT_CHAP_SECRET: 395 str += sprintf_string(str, tgt->chap_secret_len, 396 (char *)ibft_loc + tgt->chap_secret_off); 397 break; 398 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 399 str += sprintf_string(str, tgt->rev_chap_name_len, 400 (char *)ibft_loc + 401 tgt->rev_chap_name_off); 402 break; 403 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 404 str += sprintf_string(str, tgt->rev_chap_secret_len, 405 (char *)ibft_loc + 406 tgt->rev_chap_secret_off); 407 break; 408 default: 409 break; 410 } 411 412 return str - buf; 413} 414 415static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf) 416{ 417 struct ibft_kobject *entry = data; 418 char *str = buf; 419 420 switch (type) { 421 case ISCSI_BOOT_ACPITBL_SIGNATURE: 422 str += sprintf_string(str, ACPI_NAMESEG_SIZE, 423 entry->header->header.signature); 424 break; 425 case ISCSI_BOOT_ACPITBL_OEM_ID: 426 str += sprintf_string(str, ACPI_OEM_ID_SIZE, 427 entry->header->header.oem_id); 428 break; 429 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 430 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE, 431 entry->header->header.oem_table_id); 432 break; 433 default: 434 break; 435 } 436 437 return str - buf; 438} 439 440static int __init ibft_check_device(void) 441{ 442 int len; 443 u8 *pos; 444 u8 csum = 0; 445 446 len = ibft_addr->header.length; 447 448 /* Sanity checking of iBFT. */ 449 if (ibft_addr->header.revision != 1) { 450 printk(KERN_ERR "iBFT module supports only revision 1, " \ 451 "while this is %d.\n", 452 ibft_addr->header.revision); 453 return -ENOENT; 454 } 455 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 456 csum += *pos; 457 458 if (csum) { 459 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 460 return -ENOENT; 461 } 462 463 return 0; 464} 465 466/* 467 * Helper routiners to check to determine if the entry is valid 468 * in the proper iBFT structure. 469 */ 470static umode_t ibft_check_nic_for(void *data, int type) 471{ 472 struct ibft_kobject *entry = data; 473 struct ibft_nic *nic = entry->nic; 474 umode_t rc = 0; 475 476 switch (type) { 477 case ISCSI_BOOT_ETH_INDEX: 478 case ISCSI_BOOT_ETH_FLAGS: 479 rc = S_IRUGO; 480 break; 481 case ISCSI_BOOT_ETH_IP_ADDR: 482 if (address_not_null(nic->ip_addr)) 483 rc = S_IRUGO; 484 break; 485 case ISCSI_BOOT_ETH_PREFIX_LEN: 486 case ISCSI_BOOT_ETH_SUBNET_MASK: 487 if (nic->subnet_mask_prefix) 488 rc = S_IRUGO; 489 break; 490 case ISCSI_BOOT_ETH_ORIGIN: 491 rc = S_IRUGO; 492 break; 493 case ISCSI_BOOT_ETH_GATEWAY: 494 if (address_not_null(nic->gateway)) 495 rc = S_IRUGO; 496 break; 497 case ISCSI_BOOT_ETH_PRIMARY_DNS: 498 if (address_not_null(nic->primary_dns)) 499 rc = S_IRUGO; 500 break; 501 case ISCSI_BOOT_ETH_SECONDARY_DNS: 502 if (address_not_null(nic->secondary_dns)) 503 rc = S_IRUGO; 504 break; 505 case ISCSI_BOOT_ETH_DHCP: 506 if (address_not_null(nic->dhcp)) 507 rc = S_IRUGO; 508 break; 509 case ISCSI_BOOT_ETH_VLAN: 510 case ISCSI_BOOT_ETH_MAC: 511 rc = S_IRUGO; 512 break; 513 case ISCSI_BOOT_ETH_HOSTNAME: 514 if (nic->hostname_off) 515 rc = S_IRUGO; 516 break; 517 default: 518 break; 519 } 520 521 return rc; 522} 523 524static umode_t __init ibft_check_tgt_for(void *data, int type) 525{ 526 struct ibft_kobject *entry = data; 527 struct ibft_tgt *tgt = entry->tgt; 528 umode_t rc = 0; 529 530 switch (type) { 531 case ISCSI_BOOT_TGT_INDEX: 532 case ISCSI_BOOT_TGT_FLAGS: 533 case ISCSI_BOOT_TGT_IP_ADDR: 534 case ISCSI_BOOT_TGT_PORT: 535 case ISCSI_BOOT_TGT_LUN: 536 case ISCSI_BOOT_TGT_NIC_ASSOC: 537 case ISCSI_BOOT_TGT_CHAP_TYPE: 538 rc = S_IRUGO; 539 break; 540 case ISCSI_BOOT_TGT_NAME: 541 if (tgt->tgt_name_len) 542 rc = S_IRUGO; 543 break; 544 case ISCSI_BOOT_TGT_CHAP_NAME: 545 case ISCSI_BOOT_TGT_CHAP_SECRET: 546 if (tgt->chap_name_len) 547 rc = S_IRUGO; 548 break; 549 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 550 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 551 if (tgt->rev_chap_name_len) 552 rc = S_IRUGO; 553 break; 554 default: 555 break; 556 } 557 558 return rc; 559} 560 561static umode_t __init ibft_check_initiator_for(void *data, int type) 562{ 563 struct ibft_kobject *entry = data; 564 struct ibft_initiator *init = entry->initiator; 565 umode_t rc = 0; 566 567 switch (type) { 568 case ISCSI_BOOT_INI_INDEX: 569 case ISCSI_BOOT_INI_FLAGS: 570 rc = S_IRUGO; 571 break; 572 case ISCSI_BOOT_INI_ISNS_SERVER: 573 if (address_not_null(init->isns_server)) 574 rc = S_IRUGO; 575 break; 576 case ISCSI_BOOT_INI_SLP_SERVER: 577 if (address_not_null(init->slp_server)) 578 rc = S_IRUGO; 579 break; 580 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 581 if (address_not_null(init->pri_radius_server)) 582 rc = S_IRUGO; 583 break; 584 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 585 if (address_not_null(init->sec_radius_server)) 586 rc = S_IRUGO; 587 break; 588 case ISCSI_BOOT_INI_INITIATOR_NAME: 589 if (init->initiator_name_len) 590 rc = S_IRUGO; 591 break; 592 default: 593 break; 594 } 595 596 return rc; 597} 598 599static umode_t __init ibft_check_acpitbl_for(void *data, int type) 600{ 601 602 umode_t rc = 0; 603 604 switch (type) { 605 case ISCSI_BOOT_ACPITBL_SIGNATURE: 606 case ISCSI_BOOT_ACPITBL_OEM_ID: 607 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 608 rc = S_IRUGO; 609 break; 610 default: 611 break; 612 } 613 614 return rc; 615} 616 617static void ibft_kobj_release(void *data) 618{ 619 kfree(data); 620} 621 622/* 623 * Helper function for ibft_register_kobjects. 624 */ 625static int __init ibft_create_kobject(struct acpi_table_ibft *header, 626 struct ibft_hdr *hdr) 627{ 628 struct iscsi_boot_kobj *boot_kobj = NULL; 629 struct ibft_kobject *ibft_kobj = NULL; 630 struct ibft_nic *nic = (struct ibft_nic *)hdr; 631 struct pci_dev *pci_dev; 632 int rc = 0; 633 634 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 635 if (!ibft_kobj) 636 return -ENOMEM; 637 638 ibft_kobj->header = header; 639 ibft_kobj->hdr = hdr; 640 641 switch (hdr->id) { 642 case id_initiator: 643 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 644 sizeof(*ibft_kobj->initiator)); 645 if (rc) 646 break; 647 648 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 649 ibft_kobj, 650 ibft_attr_show_initiator, 651 ibft_check_initiator_for, 652 ibft_kobj_release); 653 if (!boot_kobj) { 654 rc = -ENOMEM; 655 goto free_ibft_obj; 656 } 657 break; 658 case id_nic: 659 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 660 sizeof(*ibft_kobj->nic)); 661 if (rc) 662 break; 663 664 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 665 ibft_kobj, 666 ibft_attr_show_nic, 667 ibft_check_nic_for, 668 ibft_kobj_release); 669 if (!boot_kobj) { 670 rc = -ENOMEM; 671 goto free_ibft_obj; 672 } 673 break; 674 case id_target: 675 rc = ibft_verify_hdr("target", hdr, id_target, 676 sizeof(*ibft_kobj->tgt)); 677 if (rc) 678 break; 679 680 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 681 ibft_kobj, 682 ibft_attr_show_target, 683 ibft_check_tgt_for, 684 ibft_kobj_release); 685 if (!boot_kobj) { 686 rc = -ENOMEM; 687 goto free_ibft_obj; 688 } 689 break; 690 case id_reserved: 691 case id_control: 692 case id_extensions: 693 /* Fields which we don't support. Ignore them */ 694 rc = 1; 695 break; 696 default: 697 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 698 "Report this bug to %.6s!\n", hdr->id, 699 header->header.oem_id); 700 rc = 1; 701 break; 702 } 703 704 if (rc) { 705 /* Skip adding this kobject, but exit with non-fatal error. */ 706 rc = 0; 707 goto free_ibft_obj; 708 } 709 710 if (hdr->id == id_nic) { 711 /* 712 * We don't search for the device in other domains than 713 * zero. This is because on x86 platforms the BIOS 714 * executes only devices which are in domain 0. Furthermore, the 715 * iBFT spec doesn't have a domain id field :-( 716 */ 717 pci_dev = pci_get_domain_bus_and_slot(0, 718 (nic->pci_bdf & 0xff00) >> 8, 719 (nic->pci_bdf & 0xff)); 720 if (pci_dev) { 721 rc = sysfs_create_link(&boot_kobj->kobj, 722 &pci_dev->dev.kobj, "device"); 723 pci_dev_put(pci_dev); 724 } 725 } 726 return 0; 727 728free_ibft_obj: 729 kfree(ibft_kobj); 730 return rc; 731} 732 733/* 734 * Scan the IBFT table structure for the NIC and Target fields. When 735 * found add them on the passed-in list. We do not support the other 736 * fields at this point, so they are skipped. 737 */ 738static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 739{ 740 struct ibft_control *control = NULL; 741 struct iscsi_boot_kobj *boot_kobj; 742 struct ibft_kobject *ibft_kobj; 743 void *ptr, *end; 744 int rc = 0; 745 u16 offset; 746 u16 eot_offset; 747 748 control = (void *)header + sizeof(*header); 749 end = (void *)control + control->hdr.length; 750 eot_offset = (void *)header + header->header.length - (void *)control; 751 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0); 752 753 /* iBFT table safety checking */ 754 rc |= ((control->hdr.index) ? -ENODEV : 0); 755 rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0); 756 if (rc) { 757 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 758 return rc; 759 } 760 for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) { 761 offset = *(u16 *)ptr; 762 if (offset && offset < header->header.length && 763 offset < eot_offset) { 764 rc = ibft_create_kobject(header, 765 (void *)header + offset); 766 if (rc) 767 break; 768 } 769 } 770 if (rc) 771 return rc; 772 773 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 774 if (!ibft_kobj) 775 return -ENOMEM; 776 777 ibft_kobj->header = header; 778 ibft_kobj->hdr = NULL; /*for ibft_unregister*/ 779 780 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0, 781 ibft_kobj, 782 ibft_attr_show_acpitbl, 783 ibft_check_acpitbl_for, 784 ibft_kobj_release); 785 if (!boot_kobj) { 786 kfree(ibft_kobj); 787 rc = -ENOMEM; 788 } 789 790 return rc; 791} 792 793static void ibft_unregister(void) 794{ 795 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 796 struct ibft_kobject *ibft_kobj; 797 798 list_for_each_entry_safe(boot_kobj, tmp_kobj, 799 &boot_kset->kobj_list, list) { 800 ibft_kobj = boot_kobj->data; 801 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic) 802 sysfs_remove_link(&boot_kobj->kobj, "device"); 803 }; 804} 805 806static void ibft_cleanup(void) 807{ 808 if (boot_kset) { 809 ibft_unregister(); 810 iscsi_boot_destroy_kset(boot_kset); 811 } 812} 813 814static void __exit ibft_exit(void) 815{ 816 ibft_cleanup(); 817} 818 819#ifdef CONFIG_ACPI 820static const struct { 821 char *sign; 822} ibft_signs[] = { 823 /* 824 * One spec says "IBFT", the other says "iBFT". We have to check 825 * for both. 826 */ 827 { ACPI_SIG_IBFT }, 828 { "iBFT" }, 829 { "BIFT" }, /* Broadcom iSCSI Offload */ 830}; 831 832static void __init acpi_find_ibft_region(void) 833{ 834 int i; 835 struct acpi_table_header *table = NULL; 836 837 if (acpi_disabled) 838 return; 839 840 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 841 acpi_get_table(ibft_signs[i].sign, 0, &table); 842 ibft_addr = (struct acpi_table_ibft *)table; 843 } 844} 845#else 846static void __init acpi_find_ibft_region(void) 847{ 848} 849#endif 850#ifdef CONFIG_ISCSI_IBFT_FIND 851static int __init acpi_find_isa_region(void) 852{ 853 if (ibft_phys_addr) { 854 ibft_addr = isa_bus_to_virt(ibft_phys_addr); 855 return 0; 856 } 857 return -ENODEV; 858} 859#else 860static int __init acpi_find_isa_region(void) 861{ 862 return -ENODEV; 863} 864#endif 865/* 866 * ibft_init() - creates sysfs tree entries for the iBFT data. 867 */ 868static int __init ibft_init(void) 869{ 870 int rc = 0; 871 872 /* 873 As on UEFI systems the setup_arch()/reserve_ibft_region() 874 is called before ACPI tables are parsed and it only does 875 legacy finding. 876 */ 877 if (acpi_find_isa_region()) 878 acpi_find_ibft_region(); 879 880 if (ibft_addr) { 881 pr_info("iBFT detected.\n"); 882 883 rc = ibft_check_device(); 884 if (rc) 885 return rc; 886 887 boot_kset = iscsi_boot_create_kset("ibft"); 888 if (!boot_kset) 889 return -ENOMEM; 890 891 /* Scan the IBFT for data and register the kobjects. */ 892 rc = ibft_register_kobjects(ibft_addr); 893 if (rc) 894 goto out_free; 895 } else 896 printk(KERN_INFO "No iBFT detected.\n"); 897 898 return 0; 899 900out_free: 901 ibft_cleanup(); 902 return rc; 903} 904 905module_init(ibft_init); 906module_exit(ibft_exit); 907