xref: /openbmc/linux/drivers/firmware/iscsi_ibft.c (revision 799206c1)
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 struct ibft_hdr {
90 	u8 id;
91 	u8 version;
92 	u16 length;
93 	u8 index;
94 	u8 flags;
95 } __attribute__((__packed__));
96 
97 struct 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 
108 struct 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 
118 struct 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 
134 struct 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 */
157 enum 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 
171 struct 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 
181 static struct iscsi_boot_kset *boot_kset;
182 
183 /* fully null address */
184 static const char nulls[16];
185 
186 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
187 static 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 
address_not_null(u8 * ip)192 static 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  */
sprintf_ipaddr(char * buf,u8 * ip)200 static 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 
sprintf_string(char * str,int len,char * buf)221 static 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  */
ibft_verify_hdr(char * t,struct ibft_hdr * hdr,int id,int length)229 static 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  */
ibft_attr_show_initiator(void * data,int type,char * buf)250 static 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 
ibft_attr_show_nic(void * data,int type,char * buf)291 static 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 
ibft_attr_show_target(void * data,int type,char * buf)351 static 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 
ibft_attr_show_acpitbl(void * data,int type,char * buf)415 static 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 
ibft_check_device(void)440 static 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  */
ibft_check_nic_for(void * data,int type)470 static 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 
ibft_check_tgt_for(void * data,int type)524 static 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 
ibft_check_initiator_for(void * data,int type)561 static 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 
ibft_check_acpitbl_for(void * data,int type)599 static 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 
ibft_kobj_release(void * data)617 static void ibft_kobj_release(void *data)
618 {
619 	kfree(data);
620 }
621 
622 /*
623  * Helper function for ibft_register_kobjects.
624  */
ibft_create_kobject(struct acpi_table_ibft * header,struct ibft_hdr * hdr)625 static 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 
728 free_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  */
ibft_register_kobjects(struct acpi_table_ibft * header)738 static 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 
ibft_unregister(void)793 static 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 
ibft_cleanup(void)806 static void ibft_cleanup(void)
807 {
808 	if (boot_kset) {
809 		ibft_unregister();
810 		iscsi_boot_destroy_kset(boot_kset);
811 	}
812 }
813 
ibft_exit(void)814 static void __exit ibft_exit(void)
815 {
816 	ibft_cleanup();
817 }
818 
819 #ifdef CONFIG_ACPI
820 static 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 
acpi_find_ibft_region(void)832 static 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
acpi_find_ibft_region(void)846 static void __init acpi_find_ibft_region(void)
847 {
848 }
849 #endif
850 #ifdef CONFIG_ISCSI_IBFT_FIND
acpi_find_isa_region(void)851 static 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
acpi_find_isa_region(void)860 static 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  */
ibft_init(void)868 static 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 
900 out_free:
901 	ibft_cleanup();
902 	return rc;
903 }
904 
905 module_init(ibft_init);
906 module_exit(ibft_exit);
907