GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / firmware / iscsi_ibft.c
1 /*
2  *  Copyright 2007-2010 Red Hat, Inc.
3  *  by Peter Jones <pjones@redhat.com>
4  *  Copyright 2008 IBM, Inc.
5  *  by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
6  *  Copyright 2008
7  *  by Konrad Rzeszutek <ketuzsezr@darnok.org>
8  *
9  * This code exposes the iSCSI Boot Format Table to userland via sysfs.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License v2.0 as published by
13  * the Free Software Foundation
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * Changelog:
21  *
22  *  06 Jan 2010 - Peter Jones <pjones@redhat.com>
23  *    New changelog entries are in the git log from now on.  Not here.
24  *
25  *  14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
26  *    Updated comments and copyrights. (v0.4.9)
27  *
28  *  11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
29  *    Converted to using ibft_addr. (v0.4.8)
30  *
31  *   8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
32  *    Combined two functions in one: reserve_ibft_region. (v0.4.7)
33  *
34  *  30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
35  *   Added logic to handle IPv6 addresses. (v0.4.6)
36  *
37  *  25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
38  *   Added logic to handle badly not-to-spec iBFT. (v0.4.5)
39  *
40  *   4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
41  *   Added __init to function declarations. (v0.4.4)
42  *
43  *  21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
44  *   Updated kobject registration, combined unregister functions in one
45  *   and code and style cleanup. (v0.4.3)
46  *
47  *   5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
48  *   Added end-markers to enums and re-organized kobject registration. (v0.4.2)
49  *
50  *   4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
51  *   Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
52  *
53  *  28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
54  *   Added sysfs-ibft documentation, moved 'find_ibft' function to
55  *   in its own file and added text attributes for every struct field.  (v0.4)
56  *
57  *  21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
58  *   Added text attributes emulating OpenFirmware /proc/device-tree naming.
59  *   Removed binary /sysfs interface (v0.3)
60  *
61  *  29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
62  *   Added functionality in setup.c to reserve iBFT region. (v0.2)
63  *
64  *  27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
65  *   First version exposing iBFT data via a binary /sysfs. (v0.1)
66  *
67  */
68
69
70 #include <linux/blkdev.h>
71 #include <linux/capability.h>
72 #include <linux/ctype.h>
73 #include <linux/device.h>
74 #include <linux/err.h>
75 #include <linux/init.h>
76 #include <linux/iscsi_ibft.h>
77 #include <linux/limits.h>
78 #include <linux/module.h>
79 #include <linux/pci.h>
80 #include <linux/slab.h>
81 #include <linux/stat.h>
82 #include <linux/string.h>
83 #include <linux/types.h>
84 #include <linux/acpi.h>
85 #include <linux/iscsi_boot_sysfs.h>
86
87 #define IBFT_ISCSI_VERSION "0.5.0"
88 #define IBFT_ISCSI_DATE "2010-Feb-25"
89
90 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
91               "Konrad Rzeszutek <ketuzsezr@darnok.org>");
92 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(IBFT_ISCSI_VERSION);
95
96 #ifndef CONFIG_ISCSI_IBFT_FIND
97 struct acpi_table_ibft *ibft_addr;
98 #endif
99
100 struct ibft_hdr {
101         u8 id;
102         u8 version;
103         u16 length;
104         u8 index;
105         u8 flags;
106 } __attribute__((__packed__));
107
108 struct ibft_control {
109         struct ibft_hdr hdr;
110         u16 extensions;
111         u16 initiator_off;
112         u16 nic0_off;
113         u16 tgt0_off;
114         u16 nic1_off;
115         u16 tgt1_off;
116 } __attribute__((__packed__));
117
118 struct ibft_initiator {
119         struct ibft_hdr hdr;
120         char isns_server[16];
121         char slp_server[16];
122         char pri_radius_server[16];
123         char sec_radius_server[16];
124         u16 initiator_name_len;
125         u16 initiator_name_off;
126 } __attribute__((__packed__));
127
128 struct ibft_nic {
129         struct ibft_hdr hdr;
130         char ip_addr[16];
131         u8 subnet_mask_prefix;
132         u8 origin;
133         char gateway[16];
134         char primary_dns[16];
135         char secondary_dns[16];
136         char dhcp[16];
137         u16 vlan;
138         char mac[6];
139         u16 pci_bdf;
140         u16 hostname_len;
141         u16 hostname_off;
142 } __attribute__((__packed__));
143
144 struct ibft_tgt {
145         struct ibft_hdr hdr;
146         char ip_addr[16];
147         u16 port;
148         char lun[8];
149         u8 chap_type;
150         u8 nic_assoc;
151         u16 tgt_name_len;
152         u16 tgt_name_off;
153         u16 chap_name_len;
154         u16 chap_name_off;
155         u16 chap_secret_len;
156         u16 chap_secret_off;
157         u16 rev_chap_name_len;
158         u16 rev_chap_name_off;
159         u16 rev_chap_secret_len;
160         u16 rev_chap_secret_off;
161 } __attribute__((__packed__));
162
163 /*
164  * The kobject different types and its names.
165  *
166 */
167 enum ibft_id {
168         id_reserved = 0, /* We don't support. */
169         id_control = 1, /* Should show up only once and is not exported. */
170         id_initiator = 2,
171         id_nic = 3,
172         id_target = 4,
173         id_extensions = 5, /* We don't support. */
174         id_end_marker,
175 };
176
177 /*
178  * The kobject and attribute structures.
179  */
180
181 struct ibft_kobject {
182         struct acpi_table_ibft *header;
183         union {
184                 struct ibft_initiator *initiator;
185                 struct ibft_nic *nic;
186                 struct ibft_tgt *tgt;
187                 struct ibft_hdr *hdr;
188         };
189 };
190
191 static struct iscsi_boot_kset *boot_kset;
192
193 /* fully null address */
194 static const char nulls[16];
195
196 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
197 static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,
198                                        0x00, 0x00, 0x00, 0x00,
199                                        0x00, 0x00, 0xff, 0xff,
200                                        0x00, 0x00, 0x00, 0x00 };
201
202 static int address_not_null(u8 *ip)
203 {
204         return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));
205 }
206
207 /*
208  * Helper functions to parse data properly.
209  */
210 static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
211 {
212         char *str = buf;
213
214         if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
215             ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
216             ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
217                 /*
218                  * IPV4
219                  */
220                 str += sprintf(buf, "%pI4", ip + 12);
221         } else {
222                 /*
223                  * IPv6
224                  */
225                 str += sprintf(str, "%pI6", ip);
226         }
227         str += sprintf(str, "\n");
228         return str - buf;
229 }
230
231 static ssize_t sprintf_string(char *str, int len, char *buf)
232 {
233         return sprintf(str, "%.*s\n", len, buf);
234 }
235
236 /*
237  * Helper function to verify the IBFT header.
238  */
239 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
240 {
241         if (hdr->id != id) {
242                 printk(KERN_ERR "iBFT error: We expected the %s " \
243                                 "field header.id to have %d but " \
244                                 "found %d instead!\n", t, id, hdr->id);
245                 return -ENODEV;
246         }
247         if (hdr->length != length) {
248                 printk(KERN_ERR "iBFT error: We expected the %s " \
249                                 "field header.length to have %d but " \
250                                 "found %d instead!\n", t, length, hdr->length);
251                 return -ENODEV;
252         }
253
254         return 0;
255 }
256
257 /*
258  *  Routines for parsing the iBFT data to be human readable.
259  */
260 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
261 {
262         struct ibft_kobject *entry = data;
263         struct ibft_initiator *initiator = entry->initiator;
264         void *ibft_loc = entry->header;
265         char *str = buf;
266
267         if (!initiator)
268                 return 0;
269
270         switch (type) {
271         case ISCSI_BOOT_INI_INDEX:
272                 str += sprintf(str, "%d\n", initiator->hdr.index);
273                 break;
274         case ISCSI_BOOT_INI_FLAGS:
275                 str += sprintf(str, "%d\n", initiator->hdr.flags);
276                 break;
277         case ISCSI_BOOT_INI_ISNS_SERVER:
278                 str += sprintf_ipaddr(str, initiator->isns_server);
279                 break;
280         case ISCSI_BOOT_INI_SLP_SERVER:
281                 str += sprintf_ipaddr(str, initiator->slp_server);
282                 break;
283         case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
284                 str += sprintf_ipaddr(str, initiator->pri_radius_server);
285                 break;
286         case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
287                 str += sprintf_ipaddr(str, initiator->sec_radius_server);
288                 break;
289         case ISCSI_BOOT_INI_INITIATOR_NAME:
290                 str += sprintf_string(str, initiator->initiator_name_len,
291                                       (char *)ibft_loc +
292                                       initiator->initiator_name_off);
293                 break;
294         default:
295                 break;
296         }
297
298         return str - buf;
299 }
300
301 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
302 {
303         struct ibft_kobject *entry = data;
304         struct ibft_nic *nic = entry->nic;
305         void *ibft_loc = entry->header;
306         char *str = buf;
307         __be32 val;
308
309         if (!nic)
310                 return 0;
311
312         switch (type) {
313         case ISCSI_BOOT_ETH_INDEX:
314                 str += sprintf(str, "%d\n", nic->hdr.index);
315                 break;
316         case ISCSI_BOOT_ETH_FLAGS:
317                 str += sprintf(str, "%d\n", nic->hdr.flags);
318                 break;
319         case ISCSI_BOOT_ETH_IP_ADDR:
320                 str += sprintf_ipaddr(str, nic->ip_addr);
321                 break;
322         case ISCSI_BOOT_ETH_SUBNET_MASK:
323                 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
324                 str += sprintf(str, "%pI4", &val);
325                 break;
326         case ISCSI_BOOT_ETH_ORIGIN:
327                 str += sprintf(str, "%d\n", nic->origin);
328                 break;
329         case ISCSI_BOOT_ETH_GATEWAY:
330                 str += sprintf_ipaddr(str, nic->gateway);
331                 break;
332         case ISCSI_BOOT_ETH_PRIMARY_DNS:
333                 str += sprintf_ipaddr(str, nic->primary_dns);
334                 break;
335         case ISCSI_BOOT_ETH_SECONDARY_DNS:
336                 str += sprintf_ipaddr(str, nic->secondary_dns);
337                 break;
338         case ISCSI_BOOT_ETH_DHCP:
339                 str += sprintf_ipaddr(str, nic->dhcp);
340                 break;
341         case ISCSI_BOOT_ETH_VLAN:
342                 str += sprintf(str, "%d\n", nic->vlan);
343                 break;
344         case ISCSI_BOOT_ETH_MAC:
345                 str += sprintf(str, "%pM\n", nic->mac);
346                 break;
347         case ISCSI_BOOT_ETH_HOSTNAME:
348                 str += sprintf_string(str, nic->hostname_len,
349                                       (char *)ibft_loc + nic->hostname_off);
350                 break;
351         default:
352                 break;
353         }
354
355         return str - buf;
356 };
357
358 static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
359 {
360         struct ibft_kobject *entry = data;
361         struct ibft_tgt *tgt = entry->tgt;
362         void *ibft_loc = entry->header;
363         char *str = buf;
364         int i;
365
366         if (!tgt)
367                 return 0;
368
369         switch (type) {
370         case ISCSI_BOOT_TGT_INDEX:
371                 str += sprintf(str, "%d\n", tgt->hdr.index);
372                 break;
373         case ISCSI_BOOT_TGT_FLAGS:
374                 str += sprintf(str, "%d\n", tgt->hdr.flags);
375                 break;
376         case ISCSI_BOOT_TGT_IP_ADDR:
377                 str += sprintf_ipaddr(str, tgt->ip_addr);
378                 break;
379         case ISCSI_BOOT_TGT_PORT:
380                 str += sprintf(str, "%d\n", tgt->port);
381                 break;
382         case ISCSI_BOOT_TGT_LUN:
383                 for (i = 0; i < 8; i++)
384                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
385                 str += sprintf(str, "\n");
386                 break;
387         case ISCSI_BOOT_TGT_NIC_ASSOC:
388                 str += sprintf(str, "%d\n", tgt->nic_assoc);
389                 break;
390         case ISCSI_BOOT_TGT_CHAP_TYPE:
391                 str += sprintf(str, "%d\n", tgt->chap_type);
392                 break;
393         case ISCSI_BOOT_TGT_NAME:
394                 str += sprintf_string(str, tgt->tgt_name_len,
395                                       (char *)ibft_loc + tgt->tgt_name_off);
396                 break;
397         case ISCSI_BOOT_TGT_CHAP_NAME:
398                 str += sprintf_string(str, tgt->chap_name_len,
399                                       (char *)ibft_loc + tgt->chap_name_off);
400                 break;
401         case ISCSI_BOOT_TGT_CHAP_SECRET:
402                 str += sprintf_string(str, tgt->chap_secret_len,
403                                       (char *)ibft_loc + tgt->chap_secret_off);
404                 break;
405         case ISCSI_BOOT_TGT_REV_CHAP_NAME:
406                 str += sprintf_string(str, tgt->rev_chap_name_len,
407                                       (char *)ibft_loc +
408                                       tgt->rev_chap_name_off);
409                 break;
410         case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
411                 str += sprintf_string(str, tgt->rev_chap_secret_len,
412                                       (char *)ibft_loc +
413                                       tgt->rev_chap_secret_off);
414                 break;
415         default:
416                 break;
417         }
418
419         return str - buf;
420 }
421
422 static int __init ibft_check_device(void)
423 {
424         int len;
425         u8 *pos;
426         u8 csum = 0;
427
428         len = ibft_addr->header.length;
429
430         /* Sanity checking of iBFT. */
431         if (ibft_addr->header.revision != 1) {
432                 printk(KERN_ERR "iBFT module supports only revision 1, " \
433                                 "while this is %d.\n",
434                                 ibft_addr->header.revision);
435                 return -ENOENT;
436         }
437         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
438                 csum += *pos;
439
440         if (csum) {
441                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
442                 return -ENOENT;
443         }
444
445         return 0;
446 }
447
448 /*
449  * Helper routiners to check to determine if the entry is valid
450  * in the proper iBFT structure.
451  */
452 static umode_t ibft_check_nic_for(void *data, int type)
453 {
454         struct ibft_kobject *entry = data;
455         struct ibft_nic *nic = entry->nic;
456         umode_t rc = 0;
457
458         switch (type) {
459         case ISCSI_BOOT_ETH_INDEX:
460         case ISCSI_BOOT_ETH_FLAGS:
461                 rc = S_IRUGO;
462                 break;
463         case ISCSI_BOOT_ETH_IP_ADDR:
464                 if (address_not_null(nic->ip_addr))
465                         rc = S_IRUGO;
466                 break;
467         case ISCSI_BOOT_ETH_SUBNET_MASK:
468                 if (nic->subnet_mask_prefix)
469                         rc = S_IRUGO;
470                 break;
471         case ISCSI_BOOT_ETH_ORIGIN:
472                 rc = S_IRUGO;
473                 break;
474         case ISCSI_BOOT_ETH_GATEWAY:
475                 if (address_not_null(nic->gateway))
476                         rc = S_IRUGO;
477                 break;
478         case ISCSI_BOOT_ETH_PRIMARY_DNS:
479                 if (address_not_null(nic->primary_dns))
480                         rc = S_IRUGO;
481                 break;
482         case ISCSI_BOOT_ETH_SECONDARY_DNS:
483                 if (address_not_null(nic->secondary_dns))
484                         rc = S_IRUGO;
485                 break;
486         case ISCSI_BOOT_ETH_DHCP:
487                 if (address_not_null(nic->dhcp))
488                         rc = S_IRUGO;
489                 break;
490         case ISCSI_BOOT_ETH_VLAN:
491         case ISCSI_BOOT_ETH_MAC:
492                 rc = S_IRUGO;
493                 break;
494         case ISCSI_BOOT_ETH_HOSTNAME:
495                 if (nic->hostname_off)
496                         rc = S_IRUGO;
497                 break;
498         default:
499                 break;
500         }
501
502         return rc;
503 }
504
505 static umode_t __init ibft_check_tgt_for(void *data, int type)
506 {
507         struct ibft_kobject *entry = data;
508         struct ibft_tgt *tgt = entry->tgt;
509         umode_t rc = 0;
510
511         switch (type) {
512         case ISCSI_BOOT_TGT_INDEX:
513         case ISCSI_BOOT_TGT_FLAGS:
514         case ISCSI_BOOT_TGT_IP_ADDR:
515         case ISCSI_BOOT_TGT_PORT:
516         case ISCSI_BOOT_TGT_LUN:
517         case ISCSI_BOOT_TGT_NIC_ASSOC:
518         case ISCSI_BOOT_TGT_CHAP_TYPE:
519                 rc = S_IRUGO;
520                 break;
521         case ISCSI_BOOT_TGT_NAME:
522                 if (tgt->tgt_name_len)
523                         rc = S_IRUGO;
524                 break;
525         case ISCSI_BOOT_TGT_CHAP_NAME:
526         case ISCSI_BOOT_TGT_CHAP_SECRET:
527                 if (tgt->chap_name_len)
528                         rc = S_IRUGO;
529                 break;
530         case ISCSI_BOOT_TGT_REV_CHAP_NAME:
531         case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
532                 if (tgt->rev_chap_name_len)
533                         rc = S_IRUGO;
534                 break;
535         default:
536                 break;
537         }
538
539         return rc;
540 }
541
542 static umode_t __init ibft_check_initiator_for(void *data, int type)
543 {
544         struct ibft_kobject *entry = data;
545         struct ibft_initiator *init = entry->initiator;
546         umode_t rc = 0;
547
548         switch (type) {
549         case ISCSI_BOOT_INI_INDEX:
550         case ISCSI_BOOT_INI_FLAGS:
551                 rc = S_IRUGO;
552                 break;
553         case ISCSI_BOOT_INI_ISNS_SERVER:
554                 if (address_not_null(init->isns_server))
555                         rc = S_IRUGO;
556                 break;
557         case ISCSI_BOOT_INI_SLP_SERVER:
558                 if (address_not_null(init->slp_server))
559                         rc = S_IRUGO;
560                 break;
561         case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
562                 if (address_not_null(init->pri_radius_server))
563                         rc = S_IRUGO;
564                 break;
565         case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
566                 if (address_not_null(init->sec_radius_server))
567                         rc = S_IRUGO;
568                 break;
569         case ISCSI_BOOT_INI_INITIATOR_NAME:
570                 if (init->initiator_name_len)
571                         rc = S_IRUGO;
572                 break;
573         default:
574                 break;
575         }
576
577         return rc;
578 }
579
580 static void ibft_kobj_release(void *data)
581 {
582         kfree(data);
583 }
584
585 /*
586  * Helper function for ibft_register_kobjects.
587  */
588 static int __init ibft_create_kobject(struct acpi_table_ibft *header,
589                                       struct ibft_hdr *hdr)
590 {
591         struct iscsi_boot_kobj *boot_kobj = NULL;
592         struct ibft_kobject *ibft_kobj = NULL;
593         struct ibft_nic *nic = (struct ibft_nic *)hdr;
594         struct pci_dev *pci_dev;
595         int rc = 0;
596
597         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
598         if (!ibft_kobj)
599                 return -ENOMEM;
600
601         ibft_kobj->header = header;
602         ibft_kobj->hdr = hdr;
603
604         switch (hdr->id) {
605         case id_initiator:
606                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
607                                      sizeof(*ibft_kobj->initiator));
608                 if (rc)
609                         break;
610
611                 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
612                                                 ibft_kobj,
613                                                 ibft_attr_show_initiator,
614                                                 ibft_check_initiator_for,
615                                                 ibft_kobj_release);
616                 if (!boot_kobj) {
617                         rc = -ENOMEM;
618                         goto free_ibft_obj;
619                 }
620                 break;
621         case id_nic:
622                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
623                                      sizeof(*ibft_kobj->nic));
624                 if (rc)
625                         break;
626
627                 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
628                                                        ibft_kobj,
629                                                        ibft_attr_show_nic,
630                                                        ibft_check_nic_for,
631                                                        ibft_kobj_release);
632                 if (!boot_kobj) {
633                         rc = -ENOMEM;
634                         goto free_ibft_obj;
635                 }
636                 break;
637         case id_target:
638                 rc = ibft_verify_hdr("target", hdr, id_target,
639                                      sizeof(*ibft_kobj->tgt));
640                 if (rc)
641                         break;
642
643                 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
644                                                      ibft_kobj,
645                                                      ibft_attr_show_target,
646                                                      ibft_check_tgt_for,
647                                                      ibft_kobj_release);
648                 if (!boot_kobj) {
649                         rc = -ENOMEM;
650                         goto free_ibft_obj;
651                 }
652                 break;
653         case id_reserved:
654         case id_control:
655         case id_extensions:
656                 /* Fields which we don't support. Ignore them */
657                 rc = 1;
658                 break;
659         default:
660                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
661                                 "Report this bug to %.6s!\n", hdr->id,
662                                 header->header.oem_id);
663                 rc = 1;
664                 break;
665         }
666
667         if (rc) {
668                 /* Skip adding this kobject, but exit with non-fatal error. */
669                 rc = 0;
670                 goto free_ibft_obj;
671         }
672
673         if (hdr->id == id_nic) {
674                 /*
675                 * We don't search for the device in other domains than
676                 * zero. This is because on x86 platforms the BIOS
677                 * executes only devices which are in domain 0. Furthermore, the
678                 * iBFT spec doesn't have a domain id field :-(
679                 */
680                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
681                                                (nic->pci_bdf & 0xff));
682                 if (pci_dev) {
683                         rc = sysfs_create_link(&boot_kobj->kobj,
684                                                &pci_dev->dev.kobj, "device");
685                         pci_dev_put(pci_dev);
686                 }
687         }
688         return 0;
689
690 free_ibft_obj:
691         kfree(ibft_kobj);
692         return rc;
693 }
694
695 /*
696  * Scan the IBFT table structure for the NIC and Target fields. When
697  * found add them on the passed-in list. We do not support the other
698  * fields at this point, so they are skipped.
699  */
700 static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
701 {
702         struct ibft_control *control = NULL;
703         void *ptr, *end;
704         int rc = 0;
705         u16 offset;
706         u16 eot_offset;
707
708         control = (void *)header + sizeof(*header);
709         end = (void *)control + control->hdr.length;
710         eot_offset = (void *)header + header->header.length - (void *)control;
711         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
712                              sizeof(*control));
713
714         /* iBFT table safety checking */
715         rc |= ((control->hdr.index) ? -ENODEV : 0);
716         if (rc) {
717                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
718                 return rc;
719         }
720         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
721                 offset = *(u16 *)ptr;
722                 if (offset && offset < header->header.length &&
723                                                 offset < eot_offset) {
724                         rc = ibft_create_kobject(header,
725                                                  (void *)header + offset);
726                         if (rc)
727                                 break;
728                 }
729         }
730
731         return rc;
732 }
733
734 static void ibft_unregister(void)
735 {
736         struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
737         struct ibft_kobject *ibft_kobj;
738
739         list_for_each_entry_safe(boot_kobj, tmp_kobj,
740                                  &boot_kset->kobj_list, list) {
741                 ibft_kobj = boot_kobj->data;
742                 if (ibft_kobj->hdr->id == id_nic)
743                         sysfs_remove_link(&boot_kobj->kobj, "device");
744         };
745 }
746
747 static void ibft_cleanup(void)
748 {
749         if (boot_kset) {
750                 ibft_unregister();
751                 iscsi_boot_destroy_kset(boot_kset);
752         }
753 }
754
755 static void __exit ibft_exit(void)
756 {
757         ibft_cleanup();
758 }
759
760 #ifdef CONFIG_ACPI
761 static const struct {
762         char *sign;
763 } ibft_signs[] = {
764         /*
765          * One spec says "IBFT", the other says "iBFT". We have to check
766          * for both.
767          */
768         { ACPI_SIG_IBFT },
769         { "iBFT" },
770         { "BIFT" },     /* Broadcom iSCSI Offload */
771 };
772
773 static void __init acpi_find_ibft_region(void)
774 {
775         int i;
776         struct acpi_table_header *table = NULL;
777
778         if (acpi_disabled)
779                 return;
780
781         for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
782                 acpi_get_table(ibft_signs[i].sign, 0, &table);
783                 ibft_addr = (struct acpi_table_ibft *)table;
784         }
785 }
786 #else
787 static void __init acpi_find_ibft_region(void)
788 {
789 }
790 #endif
791
792 /*
793  * ibft_init() - creates sysfs tree entries for the iBFT data.
794  */
795 static int __init ibft_init(void)
796 {
797         int rc = 0;
798
799         /*
800            As on UEFI systems the setup_arch()/find_ibft_region()
801            is called before ACPI tables are parsed and it only does
802            legacy finding.
803         */
804         if (!ibft_addr)
805                 acpi_find_ibft_region();
806
807         if (ibft_addr) {
808                 pr_info("iBFT detected.\n");
809
810                 rc = ibft_check_device();
811                 if (rc)
812                         return rc;
813
814                 boot_kset = iscsi_boot_create_kset("ibft");
815                 if (!boot_kset)
816                         return -ENOMEM;
817
818                 /* Scan the IBFT for data and register the kobjects. */
819                 rc = ibft_register_kobjects(ibft_addr);
820                 if (rc)
821                         goto out_free;
822         } else
823                 printk(KERN_INFO "No iBFT detected.\n");
824
825         return 0;
826
827 out_free:
828         ibft_cleanup();
829         return rc;
830 }
831
832 module_init(ibft_init);
833 module_exit(ibft_exit);