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