linux/drivers/firmware/iscsi_ibft.c
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   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
 189static const char nulls[16];
 190
 191/*
 192 * Helper functions to parse data properly.
 193 */
 194static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
 195{
 196        char *str = buf;
 197
 198        if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
 199            ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
 200            ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
 201                /*
 202                 * IPV4
 203                 */
 204                str += sprintf(buf, "%pI4", ip + 12);
 205        } else {
 206                /*
 207                 * IPv6
 208                 */
 209                str += sprintf(str, "%pI6", ip);
 210        }
 211        str += sprintf(str, "\n");
 212        return str - buf;
 213}
 214
 215static ssize_t sprintf_string(char *str, int len, char *buf)
 216{
 217        return sprintf(str, "%.*s\n", len, buf);
 218}
 219
 220/*
 221 * Helper function to verify the IBFT header.
 222 */
 223static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
 224{
 225        if (hdr->id != id) {
 226                printk(KERN_ERR "iBFT error: We expected the %s " \
 227                                "field header.id to have %d but " \
 228                                "found %d instead!\n", t, id, hdr->id);
 229                return -ENODEV;
 230        }
 231        if (hdr->length != length) {
 232                printk(KERN_ERR "iBFT error: We expected the %s " \
 233                                "field header.length to have %d but " \
 234                                "found %d instead!\n", t, length, hdr->length);
 235                return -ENODEV;
 236        }
 237
 238        return 0;
 239}
 240
 241/*
 242 *  Routines for parsing the iBFT data to be human readable.
 243 */
 244static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
 245{
 246        struct ibft_kobject *entry = data;
 247        struct ibft_initiator *initiator = entry->initiator;
 248        void *ibft_loc = entry->header;
 249        char *str = buf;
 250
 251        if (!initiator)
 252                return 0;
 253
 254        switch (type) {
 255        case ISCSI_BOOT_INI_INDEX:
 256                str += sprintf(str, "%d\n", initiator->hdr.index);
 257                break;
 258        case ISCSI_BOOT_INI_FLAGS:
 259                str += sprintf(str, "%d\n", initiator->hdr.flags);
 260                break;
 261        case ISCSI_BOOT_INI_ISNS_SERVER:
 262                str += sprintf_ipaddr(str, initiator->isns_server);
 263                break;
 264        case ISCSI_BOOT_INI_SLP_SERVER:
 265                str += sprintf_ipaddr(str, initiator->slp_server);
 266                break;
 267        case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
 268                str += sprintf_ipaddr(str, initiator->pri_radius_server);
 269                break;
 270        case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
 271                str += sprintf_ipaddr(str, initiator->sec_radius_server);
 272                break;
 273        case ISCSI_BOOT_INI_INITIATOR_NAME:
 274                str += sprintf_string(str, initiator->initiator_name_len,
 275                                      (char *)ibft_loc +
 276                                      initiator->initiator_name_off);
 277                break;
 278        default:
 279                break;
 280        }
 281
 282        return str - buf;
 283}
 284
 285static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
 286{
 287        struct ibft_kobject *entry = data;
 288        struct ibft_nic *nic = entry->nic;
 289        void *ibft_loc = entry->header;
 290        char *str = buf;
 291        __be32 val;
 292
 293        if (!nic)
 294                return 0;
 295
 296        switch (type) {
 297        case ISCSI_BOOT_ETH_INDEX:
 298                str += sprintf(str, "%d\n", nic->hdr.index);
 299                break;
 300        case ISCSI_BOOT_ETH_FLAGS:
 301                str += sprintf(str, "%d\n", nic->hdr.flags);
 302                break;
 303        case ISCSI_BOOT_ETH_IP_ADDR:
 304                str += sprintf_ipaddr(str, nic->ip_addr);
 305                break;
 306        case ISCSI_BOOT_ETH_SUBNET_MASK:
 307                val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
 308                str += sprintf(str, "%pI4", &val);
 309                break;
 310        case ISCSI_BOOT_ETH_ORIGIN:
 311                str += sprintf(str, "%d\n", nic->origin);
 312                break;
 313        case ISCSI_BOOT_ETH_GATEWAY:
 314                str += sprintf_ipaddr(str, nic->gateway);
 315                break;
 316        case ISCSI_BOOT_ETH_PRIMARY_DNS:
 317                str += sprintf_ipaddr(str, nic->primary_dns);
 318                break;
 319        case ISCSI_BOOT_ETH_SECONDARY_DNS:
 320                str += sprintf_ipaddr(str, nic->secondary_dns);
 321                break;
 322        case ISCSI_BOOT_ETH_DHCP:
 323                str += sprintf_ipaddr(str, nic->dhcp);
 324                break;
 325        case ISCSI_BOOT_ETH_VLAN:
 326                str += sprintf(str, "%d\n", nic->vlan);
 327                break;
 328        case ISCSI_BOOT_ETH_MAC:
 329                str += sprintf(str, "%pM\n", nic->mac);
 330                break;
 331        case ISCSI_BOOT_ETH_HOSTNAME:
 332                str += sprintf_string(str, nic->hostname_len,
 333                                      (char *)ibft_loc + nic->hostname_off);
 334                break;
 335        default:
 336                break;
 337        }
 338
 339        return str - buf;
 340};
 341
 342static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
 343{
 344        struct ibft_kobject *entry = data;
 345        struct ibft_tgt *tgt = entry->tgt;
 346        void *ibft_loc = entry->header;
 347        char *str = buf;
 348        int i;
 349
 350        if (!tgt)
 351                return 0;
 352
 353        switch (type) {
 354        case ISCSI_BOOT_TGT_INDEX:
 355                str += sprintf(str, "%d\n", tgt->hdr.index);
 356                break;
 357        case ISCSI_BOOT_TGT_FLAGS:
 358                str += sprintf(str, "%d\n", tgt->hdr.flags);
 359                break;
 360        case ISCSI_BOOT_TGT_IP_ADDR:
 361                str += sprintf_ipaddr(str, tgt->ip_addr);
 362                break;
 363        case ISCSI_BOOT_TGT_PORT:
 364                str += sprintf(str, "%d\n", tgt->port);
 365                break;
 366        case ISCSI_BOOT_TGT_LUN:
 367                for (i = 0; i < 8; i++)
 368                        str += sprintf(str, "%x", (u8)tgt->lun[i]);
 369                str += sprintf(str, "\n");
 370                break;
 371        case ISCSI_BOOT_TGT_NIC_ASSOC:
 372                str += sprintf(str, "%d\n", tgt->nic_assoc);
 373                break;
 374        case ISCSI_BOOT_TGT_CHAP_TYPE:
 375                str += sprintf(str, "%d\n", tgt->chap_type);
 376                break;
 377        case ISCSI_BOOT_TGT_NAME:
 378                str += sprintf_string(str, tgt->tgt_name_len,
 379                                      (char *)ibft_loc + tgt->tgt_name_off);
 380                break;
 381        case ISCSI_BOOT_TGT_CHAP_NAME:
 382                str += sprintf_string(str, tgt->chap_name_len,
 383                                      (char *)ibft_loc + tgt->chap_name_off);
 384                break;
 385        case ISCSI_BOOT_TGT_CHAP_SECRET:
 386                str += sprintf_string(str, tgt->chap_secret_len,
 387                                      (char *)ibft_loc + tgt->chap_secret_off);
 388                break;
 389        case ISCSI_BOOT_TGT_REV_CHAP_NAME:
 390                str += sprintf_string(str, tgt->rev_chap_name_len,
 391                                      (char *)ibft_loc +
 392                                      tgt->rev_chap_name_off);
 393                break;
 394        case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
 395                str += sprintf_string(str, tgt->rev_chap_secret_len,
 396                                      (char *)ibft_loc +
 397                                      tgt->rev_chap_secret_off);
 398                break;
 399        default:
 400                break;
 401        }
 402
 403        return str - buf;
 404}
 405
 406static int __init ibft_check_device(void)
 407{
 408        int len;
 409        u8 *pos;
 410        u8 csum = 0;
 411
 412        len = ibft_addr->header.length;
 413
 414        /* Sanity checking of iBFT. */
 415        if (ibft_addr->header.revision != 1) {
 416                printk(KERN_ERR "iBFT module supports only revision 1, " \
 417                                "while this is %d.\n",
 418                                ibft_addr->header.revision);
 419                return -ENOENT;
 420        }
 421        for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
 422                csum += *pos;
 423
 424        if (csum) {
 425                printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
 426                return -ENOENT;
 427        }
 428
 429        return 0;
 430}
 431
 432/*
 433 * Helper routiners to check to determine if the entry is valid
 434 * in the proper iBFT structure.
 435 */
 436static umode_t ibft_check_nic_for(void *data, int type)
 437{
 438        struct ibft_kobject *entry = data;
 439        struct ibft_nic *nic = entry->nic;
 440        umode_t rc = 0;
 441
 442        switch (type) {
 443        case ISCSI_BOOT_ETH_INDEX:
 444        case ISCSI_BOOT_ETH_FLAGS:
 445                rc = S_IRUGO;
 446                break;
 447        case ISCSI_BOOT_ETH_IP_ADDR:
 448                if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr)))
 449                        rc = S_IRUGO;
 450                break;
 451        case ISCSI_BOOT_ETH_SUBNET_MASK:
 452                if (nic->subnet_mask_prefix)
 453                        rc = S_IRUGO;
 454                break;
 455        case ISCSI_BOOT_ETH_ORIGIN:
 456                rc = S_IRUGO;
 457                break;
 458        case ISCSI_BOOT_ETH_GATEWAY:
 459                if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
 460                        rc = S_IRUGO;
 461                break;
 462        case ISCSI_BOOT_ETH_PRIMARY_DNS:
 463                if (memcmp(nic->primary_dns, nulls,
 464                           sizeof(nic->primary_dns)))
 465                        rc = S_IRUGO;
 466                break;
 467        case ISCSI_BOOT_ETH_SECONDARY_DNS:
 468                if (memcmp(nic->secondary_dns, nulls,
 469                           sizeof(nic->secondary_dns)))
 470                        rc = S_IRUGO;
 471                break;
 472        case ISCSI_BOOT_ETH_DHCP:
 473                if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
 474                        rc = S_IRUGO;
 475                break;
 476        case ISCSI_BOOT_ETH_VLAN:
 477        case ISCSI_BOOT_ETH_MAC:
 478                rc = S_IRUGO;
 479                break;
 480        case ISCSI_BOOT_ETH_HOSTNAME:
 481                if (nic->hostname_off)
 482                        rc = S_IRUGO;
 483                break;
 484        default:
 485                break;
 486        }
 487
 488        return rc;
 489}
 490
 491static umode_t __init ibft_check_tgt_for(void *data, int type)
 492{
 493        struct ibft_kobject *entry = data;
 494        struct ibft_tgt *tgt = entry->tgt;
 495        umode_t rc = 0;
 496
 497        switch (type) {
 498        case ISCSI_BOOT_TGT_INDEX:
 499        case ISCSI_BOOT_TGT_FLAGS:
 500        case ISCSI_BOOT_TGT_IP_ADDR:
 501        case ISCSI_BOOT_TGT_PORT:
 502        case ISCSI_BOOT_TGT_LUN:
 503        case ISCSI_BOOT_TGT_NIC_ASSOC:
 504        case ISCSI_BOOT_TGT_CHAP_TYPE:
 505                rc = S_IRUGO;
 506        case ISCSI_BOOT_TGT_NAME:
 507                if (tgt->tgt_name_len)
 508                        rc = S_IRUGO;
 509                break;
 510        case ISCSI_BOOT_TGT_CHAP_NAME:
 511        case ISCSI_BOOT_TGT_CHAP_SECRET:
 512                if (tgt->chap_name_len)
 513                        rc = S_IRUGO;
 514                break;
 515        case ISCSI_BOOT_TGT_REV_CHAP_NAME:
 516        case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
 517                if (tgt->rev_chap_name_len)
 518                        rc = S_IRUGO;
 519                break;
 520        default:
 521                break;
 522        }
 523
 524        return rc;
 525}
 526
 527static umode_t __init ibft_check_initiator_for(void *data, int type)
 528{
 529        struct ibft_kobject *entry = data;
 530        struct ibft_initiator *init = entry->initiator;
 531        umode_t rc = 0;
 532
 533        switch (type) {
 534        case ISCSI_BOOT_INI_INDEX:
 535        case ISCSI_BOOT_INI_FLAGS:
 536                rc = S_IRUGO;
 537                break;
 538        case ISCSI_BOOT_INI_ISNS_SERVER:
 539                if (memcmp(init->isns_server, nulls,
 540                           sizeof(init->isns_server)))
 541                        rc = S_IRUGO;
 542                break;
 543        case ISCSI_BOOT_INI_SLP_SERVER:
 544                if (memcmp(init->slp_server, nulls,
 545                           sizeof(init->slp_server)))
 546                        rc = S_IRUGO;
 547                break;
 548        case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
 549                if (memcmp(init->pri_radius_server, nulls,
 550                           sizeof(init->pri_radius_server)))
 551                        rc = S_IRUGO;
 552                break;
 553        case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
 554                if (memcmp(init->sec_radius_server, nulls,
 555                           sizeof(init->sec_radius_server)))
 556                        rc = S_IRUGO;
 557                break;
 558        case ISCSI_BOOT_INI_INITIATOR_NAME:
 559                if (init->initiator_name_len)
 560                        rc = S_IRUGO;
 561                break;
 562        default:
 563                break;
 564        }
 565
 566        return rc;
 567}
 568
 569static void ibft_kobj_release(void *data)
 570{
 571        kfree(data);
 572}
 573
 574/*
 575 * Helper function for ibft_register_kobjects.
 576 */
 577static int __init ibft_create_kobject(struct acpi_table_ibft *header,
 578                                      struct ibft_hdr *hdr)
 579{
 580        struct iscsi_boot_kobj *boot_kobj = NULL;
 581        struct ibft_kobject *ibft_kobj = NULL;
 582        struct ibft_nic *nic = (struct ibft_nic *)hdr;
 583        struct pci_dev *pci_dev;
 584        int rc = 0;
 585
 586        ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
 587        if (!ibft_kobj)
 588                return -ENOMEM;
 589
 590        ibft_kobj->header = header;
 591        ibft_kobj->hdr = hdr;
 592
 593        switch (hdr->id) {
 594        case id_initiator:
 595                rc = ibft_verify_hdr("initiator", hdr, id_initiator,
 596                                     sizeof(*ibft_kobj->initiator));
 597                if (rc)
 598                        break;
 599
 600                boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
 601                                                ibft_kobj,
 602                                                ibft_attr_show_initiator,
 603                                                ibft_check_initiator_for,
 604                                                ibft_kobj_release);
 605                if (!boot_kobj) {
 606                        rc = -ENOMEM;
 607                        goto free_ibft_obj;
 608                }
 609                break;
 610        case id_nic:
 611                rc = ibft_verify_hdr("ethernet", hdr, id_nic,
 612                                     sizeof(*ibft_kobj->nic));
 613                if (rc)
 614                        break;
 615
 616                boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
 617                                                       ibft_kobj,
 618                                                       ibft_attr_show_nic,
 619                                                       ibft_check_nic_for,
 620                                                       ibft_kobj_release);
 621                if (!boot_kobj) {
 622                        rc = -ENOMEM;
 623                        goto free_ibft_obj;
 624                }
 625                break;
 626        case id_target:
 627                rc = ibft_verify_hdr("target", hdr, id_target,
 628                                     sizeof(*ibft_kobj->tgt));
 629                if (rc)
 630                        break;
 631
 632                boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
 633                                                     ibft_kobj,
 634                                                     ibft_attr_show_target,
 635                                                     ibft_check_tgt_for,
 636                                                     ibft_kobj_release);
 637                if (!boot_kobj) {
 638                        rc = -ENOMEM;
 639                        goto free_ibft_obj;
 640                }
 641                break;
 642        case id_reserved:
 643        case id_control:
 644        case id_extensions:
 645                /* Fields which we don't support. Ignore them */
 646                rc = 1;
 647                break;
 648        default:
 649                printk(KERN_ERR "iBFT has unknown structure type (%d). " \
 650                                "Report this bug to %.6s!\n", hdr->id,
 651                                header->header.oem_id);
 652                rc = 1;
 653                break;
 654        }
 655
 656        if (rc) {
 657                /* Skip adding this kobject, but exit with non-fatal error. */
 658                rc = 0;
 659                goto free_ibft_obj;
 660        }
 661
 662        if (hdr->id == id_nic) {
 663                /*
 664                * We don't search for the device in other domains than
 665                * zero. This is because on x86 platforms the BIOS
 666                * executes only devices which are in domain 0. Furthermore, the
 667                * iBFT spec doesn't have a domain id field :-(
 668                */
 669                pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
 670                                               (nic->pci_bdf & 0xff));
 671                if (pci_dev) {
 672                        rc = sysfs_create_link(&boot_kobj->kobj,
 673                                               &pci_dev->dev.kobj, "device");
 674                        pci_dev_put(pci_dev);
 675                }
 676        }
 677        return 0;
 678
 679free_ibft_obj:
 680        kfree(ibft_kobj);
 681        return rc;
 682}
 683
 684/*
 685 * Scan the IBFT table structure for the NIC and Target fields. When
 686 * found add them on the passed-in list. We do not support the other
 687 * fields at this point, so they are skipped.
 688 */
 689static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
 690{
 691        struct ibft_control *control = NULL;
 692        void *ptr, *end;
 693        int rc = 0;
 694        u16 offset;
 695        u16 eot_offset;
 696
 697        control = (void *)header + sizeof(*header);
 698        end = (void *)control + control->hdr.length;
 699        eot_offset = (void *)header + header->header.length - (void *)control;
 700        rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
 701                             sizeof(*control));
 702
 703        /* iBFT table safety checking */
 704        rc |= ((control->hdr.index) ? -ENODEV : 0);
 705        if (rc) {
 706                printk(KERN_ERR "iBFT error: Control header is invalid!\n");
 707                return rc;
 708        }
 709        for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
 710                offset = *(u16 *)ptr;
 711                if (offset && offset < header->header.length &&
 712                                                offset < eot_offset) {
 713                        rc = ibft_create_kobject(header,
 714                                                 (void *)header + offset);
 715                        if (rc)
 716                                break;
 717                }
 718        }
 719
 720        return rc;
 721}
 722
 723static void ibft_unregister(void)
 724{
 725        struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
 726        struct ibft_kobject *ibft_kobj;
 727
 728        list_for_each_entry_safe(boot_kobj, tmp_kobj,
 729                                 &boot_kset->kobj_list, list) {
 730                ibft_kobj = boot_kobj->data;
 731                if (ibft_kobj->hdr->id == id_nic)
 732                        sysfs_remove_link(&boot_kobj->kobj, "device");
 733        };
 734}
 735
 736static void ibft_cleanup(void)
 737{
 738        if (boot_kset) {
 739                ibft_unregister();
 740                iscsi_boot_destroy_kset(boot_kset);
 741        }
 742}
 743
 744static void __exit ibft_exit(void)
 745{
 746        ibft_cleanup();
 747}
 748
 749#ifdef CONFIG_ACPI
 750static const struct {
 751        char *sign;
 752} ibft_signs[] = {
 753        /*
 754         * One spec says "IBFT", the other says "iBFT". We have to check
 755         * for both.
 756         */
 757        { ACPI_SIG_IBFT },
 758        { "iBFT" },
 759};
 760
 761static void __init acpi_find_ibft_region(void)
 762{
 763        int i;
 764        struct acpi_table_header *table = NULL;
 765
 766        if (acpi_disabled)
 767                return;
 768
 769        for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
 770                acpi_get_table(ibft_signs[i].sign, 0, &table);
 771                ibft_addr = (struct acpi_table_ibft *)table;
 772        }
 773}
 774#else
 775static void __init acpi_find_ibft_region(void)
 776{
 777}
 778#endif
 779
 780/*
 781 * ibft_init() - creates sysfs tree entries for the iBFT data.
 782 */
 783static int __init ibft_init(void)
 784{
 785        int rc = 0;
 786
 787        /*
 788           As on UEFI systems the setup_arch()/find_ibft_region()
 789           is called before ACPI tables are parsed and it only does
 790           legacy finding.
 791        */
 792        if (!ibft_addr)
 793                acpi_find_ibft_region();
 794
 795        if (ibft_addr) {
 796                pr_info("iBFT detected.\n");
 797
 798                rc = ibft_check_device();
 799                if (rc)
 800                        return rc;
 801
 802                boot_kset = iscsi_boot_create_kset("ibft");
 803                if (!boot_kset)
 804                        return -ENOMEM;
 805
 806                /* Scan the IBFT for data and register the kobjects. */
 807                rc = ibft_register_kobjects(ibft_addr);
 808                if (rc)
 809                        goto out_free;
 810        } else
 811                printk(KERN_INFO "No iBFT detected.\n");
 812
 813        return 0;
 814
 815out_free:
 816        ibft_cleanup();
 817        return rc;
 818}
 819
 820module_init(ibft_init);
 821module_exit(ibft_exit);
 822
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