summaryrefslogtreecommitdiffstats
path: root/platform-intel.c
blob: 757f0b1b8f4da6239883042167d3d2f27dd960f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
/*
 * Intel(R) Matrix Storage Manager hardware and firmware support routines
 *
 * Copyright (C) 2008 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */
#include "mdadm.h"
#include "platform-intel.h"
#include "probe_roms.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>

#define NVME_SUBSYS_PATH "/sys/devices/virtual/nvme-subsystem/"

static int devpath_to_ll(const char *dev_path, const char *entry,
			 unsigned long long *val);

static void free_sys_dev(struct sys_dev **list)
{
	while (*list) {
		struct sys_dev *next = (*list)->next;

		if ((*list)->path)
			free((*list)->path);
		free(*list);
		*list = next;
	}
}

struct sys_dev *find_driver_devices(const char *bus, const char *driver)
{
	/* search sysfs for devices driven by 'driver' */
	char path[PATH_MAX];
	char link[PATH_MAX];
	char *c, *p;
	DIR *driver_dir;
	struct dirent *de;
	struct sys_dev *head = NULL;
	struct sys_dev *list = NULL;
	struct sys_dev *vmd = NULL;
	enum sys_dev_type type;
	unsigned long long dev_id;
	unsigned long long class;

	if (strcmp(driver, "isci") == 0)
		type = SYS_DEV_SAS;
	else if (strcmp(driver, "ahci") == 0)
		type = SYS_DEV_SATA;
	else if (strcmp(driver, "nvme") == 0) {
		/* if looking for nvme devs, first look for vmd */
		vmd = find_driver_devices("pci", "vmd");
		type = SYS_DEV_NVME;
	} else if (strcmp(driver, "vmd") == 0)
		type = SYS_DEV_VMD;
	else
		type = SYS_DEV_UNKNOWN;

	sprintf(path, "/sys/bus/%s/drivers/%s", bus, driver);
	driver_dir = opendir(path);
	if (!driver_dir) {
		if (vmd)
			free_sys_dev(&vmd);
		return NULL;
	}
	for (de = readdir(driver_dir); de; de = readdir(driver_dir)) {
		int n;
		int skip = 0;

		/* is 'de' a device? check that the 'subsystem' link exists and
		 * that its target matches 'bus'
		 */
		sprintf(path, "/sys/bus/%s/drivers/%s/%s/subsystem",
			bus, driver, de->d_name);
		n = readlink(path, link, sizeof(link));
		if (n < 0 || n >= (int)sizeof(link))
			continue;
		link[n] = '\0';
		c = strrchr(link, '/');
		if (!c)
			continue;
		if (strncmp(bus, c+1, strlen(bus)) != 0)
			continue;

		sprintf(path, "/sys/bus/%s/drivers/%s/%s",
			bus, driver, de->d_name);

		/* if searching for nvme - skip vmd connected one */
		if (type == SYS_DEV_NVME) {
			struct sys_dev *dev;
			char *rp = realpath(path, NULL);
			for (dev = vmd; dev; dev = dev->next) {
				if ((strncmp(dev->path, rp, strlen(dev->path)) == 0))
					skip = 1;
			}
			free(rp);
		}

		/* if it's not Intel device or mark as VMD connected - skip it. */
		if (devpath_to_vendor(path) != 0x8086 || skip == 1)
			continue;

		if (devpath_to_ll(path, "device", &dev_id) != 0)
			continue;

		if (devpath_to_ll(path, "class", &class) != 0)
			continue;

		/*
		 * Each VMD device (domain) adds separate PCI bus, it is better
		 * to store path as a path to that bus (easier further
		 * determination which NVMe dev is connected to this particular
		 * VMD domain).
		 */
		if (type == SYS_DEV_VMD) {
			sprintf(path, "/sys/bus/%s/drivers/%s/%s/domain/device",
				bus, driver, de->d_name);
		}
		p = realpath(path, NULL);
		if (p == NULL) {
			pr_err("Unable to get real path for '%s'\n", path);
			continue;
		}

		/* start / add list entry */
		if (!head) {
			head = xmalloc(sizeof(*head));
			list = head;
		} else {
			list->next = xmalloc(sizeof(*head));
			list = list->next;
		}

		if (!list) {
			free_sys_dev(&head);
			break;
		}

		list->dev_id = (__u16) dev_id;
		list->class = (__u32) class;
		list->type = type;
		list->next = NULL;
		list->path = p;

		if ((list->pci_id = strrchr(list->path, '/')) != NULL)
			list->pci_id++;
	}
	closedir(driver_dir);

	if (vmd) {
		if (list)
			list->next = vmd;
		else
			head = vmd;
	}

	return head;
}

static struct sys_dev *intel_devices=NULL;
static time_t valid_time = 0;

struct sys_dev *device_by_id(__u16 device_id)
{
	struct sys_dev *iter;

	for (iter = intel_devices; iter != NULL; iter = iter->next)
		if (iter->dev_id == device_id)
			return iter;
	return NULL;
}

struct sys_dev *device_by_id_and_path(__u16 device_id, const char *path)
{
	struct sys_dev *iter;

	for (iter = intel_devices; iter != NULL; iter = iter->next)
		if ((iter->dev_id == device_id) && strstr(iter->path, path))
			return iter;
	return NULL;
}

static int devpath_to_ll(const char *dev_path, const char *entry, unsigned long long *val)
{
	char path[strlen(dev_path) + strlen(entry) + 2];
	int fd;
	int n;

	sprintf(path, "%s/%s", dev_path, entry);

	fd = open(path, O_RDONLY);
	if (fd < 0)
		return -1;
	n = sysfs_fd_get_ll(fd, val);
	close(fd);
	return n;
}

__u16 devpath_to_vendor(const char *dev_path)
{
	char path[strlen(dev_path) + strlen("/vendor") + 1];
	char vendor[7];
	int fd;
	__u16 id = 0xffff;
	int n;

	sprintf(path, "%s/vendor", dev_path);

	fd = open(path, O_RDONLY);
	if (fd < 0)
		return 0xffff;

	n = read(fd, vendor, sizeof(vendor));
	if (n == sizeof(vendor)) {
		vendor[n - 1] = '\0';
		id = strtoul(vendor, NULL, 16);
	}
	close(fd);

	return id;
}

/* Description: Read text value of dev_path/entry field
 * Parameters:
 *	dev_path - sysfs path to the device
 *	entry - entry to be read
 *	buf - buffer for read value
 *	len - size of buf
 *	verbose - error logging level
 */
int devpath_to_char(const char *dev_path, const char *entry, char *buf, int len,
		    int verbose)
{
	char path[PATH_MAX];

	snprintf(path, sizeof(path), "%s/%s", dev_path, entry);
	if (load_sys(path, buf, len)) {
		if (verbose)
			pr_err("Cannot read %s, aborting\n", path);
		return 1;
	}

	return 0;
}

struct sys_dev *find_intel_devices(void)
{
	struct sys_dev *ahci, *isci, *nvme;

	if (valid_time > time(0) - 10)
		return intel_devices;

	if (intel_devices)
		free_sys_dev(&intel_devices);

	isci = find_driver_devices("pci", "isci");
	ahci = find_driver_devices("pci", "ahci");
	/* Searching for NVMe will return list of NVMe and VMD controllers */
	nvme = find_driver_devices("pci", "nvme");

	if (!isci && !ahci) {
		ahci = nvme;
	} else if (!ahci) {
		ahci = isci;
		struct sys_dev *elem = ahci;
		while (elem->next)
			elem = elem->next;
		elem->next = nvme;
	} else {
		struct sys_dev *elem = ahci;
		while (elem->next)
			elem = elem->next;
		elem->next = isci;
		while (elem->next)
			elem = elem->next;
		elem->next = nvme;
	}
	intel_devices = ahci;
	valid_time = time(0);
	return intel_devices;
}

/*
 * PCI Expansion ROM Data Structure Format */
struct pciExpDataStructFormat {
	__u8  ver[4];
	__u16 vendorID;
	__u16 deviceID;
	__u16 devListOffset;
	__u16 pciDataStructLen;
	__u8 pciDataStructRev;
} __attribute__ ((packed));

struct orom_entry *orom_entries;

const struct orom_entry *get_orom_entry_by_device_id(__u16 dev_id)
{
	struct orom_entry *entry;
	struct devid_list *devid;

	for (entry = orom_entries; entry; entry = entry->next) {
		for (devid = entry->devid_list; devid; devid = devid->next) {
			if (devid->devid == dev_id)
				return entry;
		}
	}

	return NULL;
}

const struct imsm_orom *get_orom_by_device_id(__u16 dev_id)
{
	const struct orom_entry *entry = get_orom_entry_by_device_id(dev_id);

	if (entry)
		return &entry->orom;

	return NULL;
}

static struct orom_entry *add_orom(const struct imsm_orom *orom)
{
	struct orom_entry *list;
	struct orom_entry *prev = NULL;

	for (list = orom_entries; list; prev = list, list = list->next)
		;

	list = xmalloc(sizeof(struct orom_entry));
	list->orom = *orom;
	list->devid_list = NULL;
	list->next = NULL;

	if (prev == NULL)
		orom_entries = list;
	else
		prev->next = list;

	return list;
}

static void add_orom_device_id(struct orom_entry *entry, __u16 dev_id)
{
	struct devid_list *list;
	struct devid_list *prev = NULL;

	for (list = entry->devid_list; list; prev = list, list = list->next) {
		if (list->devid == dev_id)
			return;
	}
	list = xmalloc(sizeof(struct devid_list));
	list->devid = dev_id;
	list->next = NULL;

	if (prev == NULL)
		entry->devid_list = list;
	else
		prev->next = list;
}

static int scan(const void *start, const void *end, const void *data)
{
	int offset;
	const struct imsm_orom *imsm_mem = NULL;
	int len = (end - start);
	struct pciExpDataStructFormat *ptr= (struct pciExpDataStructFormat *)data;

	if (data + 0x18 > end) {
		dprintf("cannot find pciExpDataStruct \n");
		return 0;
	}

	dprintf("ptr->vendorID: %lx __le16_to_cpu(ptr->deviceID): %lx \n",
		(ulong) __le16_to_cpu(ptr->vendorID),
		(ulong) __le16_to_cpu(ptr->deviceID));

	if (__le16_to_cpu(ptr->vendorID) != 0x8086)
		return 0;

	if (get_orom_by_device_id(ptr->deviceID))
		return 0;

	for (offset = 0; offset < len; offset += 4) {
		const void *mem = start + offset;

		if ((memcmp(mem, IMSM_OROM_SIGNATURE, 4) == 0)) {
			imsm_mem = mem;
			break;
		}
	}

	if (!imsm_mem)
		return 0;

	struct orom_entry *orom = add_orom(imsm_mem);

	/* only PciDataStructure with revision 3 and above supports devices list. */
	if (ptr->pciDataStructRev >= 3 && ptr->devListOffset) {
		const __u16 *dev_list = (void *)ptr + ptr->devListOffset;
		int i;

		for (i = 0; dev_list[i] != 0; i++)
			add_orom_device_id(orom, dev_list[i]);
	} else {
		add_orom_device_id(orom, __le16_to_cpu(ptr->deviceID));
	}

	return 0;
}

const struct imsm_orom *imsm_platform_test(struct sys_dev *hba)
{
	struct imsm_orom orom = {
		.signature = IMSM_OROM_SIGNATURE,
		.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
					IMSM_OROM_RLC_RAID10 | IMSM_OROM_RLC_RAID5,
		.sss = IMSM_OROM_SSS_4kB | IMSM_OROM_SSS_8kB |
					IMSM_OROM_SSS_16kB | IMSM_OROM_SSS_32kB |
					IMSM_OROM_SSS_64kB | IMSM_OROM_SSS_128kB |
					IMSM_OROM_SSS_256kB | IMSM_OROM_SSS_512kB |
					IMSM_OROM_SSS_1MB | IMSM_OROM_SSS_2MB,
		.dpa = IMSM_OROM_DISKS_PER_ARRAY,
		.tds = IMSM_OROM_TOTAL_DISKS,
		.vpa = IMSM_OROM_VOLUMES_PER_ARRAY,
		.vphba = IMSM_OROM_VOLUMES_PER_HBA
	};
	orom.attr = orom.rlc | IMSM_OROM_ATTR_ChecksumVerify;

	if (check_env("IMSM_TEST_OROM_NORAID5")) {
		orom.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
				IMSM_OROM_RLC_RAID10;
	}
	if (check_env("IMSM_TEST_AHCI_EFI_NORAID5") && (hba->type == SYS_DEV_SAS)) {
		orom.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
				IMSM_OROM_RLC_RAID10;
	}
	if (check_env("IMSM_TEST_SCU_EFI_NORAID5") && (hba->type == SYS_DEV_SATA)) {
		orom.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
				IMSM_OROM_RLC_RAID10;
	}

	struct orom_entry *ret = add_orom(&orom);

	add_orom_device_id(ret, hba->dev_id);

	return &ret->orom;
}

static const struct imsm_orom *find_imsm_hba_orom(struct sys_dev *hba)
{
	unsigned long align;

	if (check_env("IMSM_TEST_OROM"))
		return imsm_platform_test(hba);

	/* return empty OROM capabilities in EFI test mode */
	if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
		return NULL;

	find_intel_devices();

	if (intel_devices == NULL)
		return NULL;

	/* scan option-rom memory looking for an imsm signature */
	if (check_env("IMSM_SAFE_OROM_SCAN"))
		align = 2048;
	else
		align = 512;
	if (probe_roms_init(align) != 0)
		return NULL;
	probe_roms();
	/* ignore return value - True is returned if both adapater roms are found */
	scan_adapter_roms(scan);
	probe_roms_exit();

	return get_orom_by_device_id(hba->dev_id);
}

#define GUID_STR_MAX	37  /* according to GUID format:
			     * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" */

#define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
((struct efi_guid) \
{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
  (b) & 0xff, ((b) >> 8) & 0xff, \
  (c) & 0xff, ((c) >> 8) & 0xff, \
  (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})

#define SYS_EFI_VAR_PATH "/sys/firmware/efi/vars"
#define SYS_EFIVARS_PATH "/sys/firmware/efi/efivars"
#define SCU_PROP "RstScuV"
#define AHCI_PROP "RstSataV"
#define AHCI_SSATA_PROP "RstsSatV"
#define AHCI_TSATA_PROP "RsttSatV"
#define VROC_VMD_PROP "RstUefiV"
#define RST_VMD_PROP "RstVmdV"

#define VENDOR_GUID \
	EFI_GUID(0x193dfefa, 0xa445, 0x4302, 0x99, 0xd8, 0xef, 0x3a, 0xad, 0x1a, 0x04, 0xc6)

#define PCI_CLASS_RAID_CNTRL 0x010400

static int read_efi_var(void *buffer, ssize_t buf_size,
			const char *variable_name, struct efi_guid guid)
{
	char path[PATH_MAX];
	char buf[GUID_STR_MAX];
	int fd;
	ssize_t n;

	snprintf(path, PATH_MAX, "%s/%s-%s", SYS_EFIVARS_PATH, variable_name, guid_str(buf, guid));

	fd = open(path, O_RDONLY);
	if (fd < 0)
		return 1;

	/* read the variable attributes and ignore it */
	n = read(fd, buf, sizeof(__u32));
	if (n < 0) {
		close(fd);
		return 1;
	}

	/* read the variable data */
	n = read(fd, buffer, buf_size);
	close(fd);
	if (n < buf_size)
		return 1;

	return 0;
}

static int read_efi_variable(void *buffer, ssize_t buf_size,
			     const char *variable_name, struct efi_guid guid)
{
	char path[PATH_MAX];
	char buf[GUID_STR_MAX];
	int dfd;
	ssize_t n, var_data_len;

	/* Try to read the variable using the new efivarfs interface first.
	 * If that fails, fall back to the old sysfs-efivars interface. */
	if (!read_efi_var(buffer, buf_size, variable_name, guid))
		return 0;

	snprintf(path, PATH_MAX, "%s/%s-%s/size", SYS_EFI_VAR_PATH, variable_name, guid_str(buf, guid));

	dprintf("EFI VAR: path=%s\n", path);
	/* get size of variable data */
	dfd = open(path, O_RDONLY);
	if (dfd < 0)
		return 1;

	n = read(dfd, &buf, sizeof(buf));
	close(dfd);
	if (n < 0)
		return 1;
	buf[n] = '\0';

	errno = 0;
	var_data_len = strtoul(buf, NULL, 16);
	if ((errno == ERANGE && (var_data_len == LONG_MAX)) ||
	    (errno != 0 && var_data_len == 0))
		return 1;

	/* get data */
	snprintf(path, PATH_MAX, "%s/%s-%s/data", SYS_EFI_VAR_PATH, variable_name, guid_str(buf, guid));

	dprintf("EFI VAR: path=%s\n", path);
	dfd = open(path, O_RDONLY);
	if (dfd < 0)
		return 1;

	n = read(dfd, buffer, buf_size);
	close(dfd);
	if (n != var_data_len || n < buf_size) {
		return 1;
	}

	return 0;
}

const struct imsm_orom *find_imsm_efi(struct sys_dev *hba)
{
	struct imsm_orom orom;
	struct orom_entry *ret;
	static const char * const sata_efivars[] = {AHCI_PROP, AHCI_SSATA_PROP,
						    AHCI_TSATA_PROP};
	static const char * const vmd_efivars[] = {VROC_VMD_PROP, RST_VMD_PROP};
	unsigned long i;

	if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
		return imsm_platform_test(hba);

	/* OROM test is set, return that there is no EFI capabilities */
	if (check_env("IMSM_TEST_OROM"))
		return NULL;

	switch (hba->type) {
	case SYS_DEV_SAS:
		if (!read_efi_variable(&orom, sizeof(orom), SCU_PROP,
				       VENDOR_GUID))
			break;

		return NULL;
	case SYS_DEV_SATA:
		if (hba->class != PCI_CLASS_RAID_CNTRL)
			return NULL;

		for (i = 0; i < ARRAY_SIZE(sata_efivars); i++) {
			if (!read_efi_variable(&orom, sizeof(orom),
						sata_efivars[i], VENDOR_GUID))
				break;

		}
		if (i == ARRAY_SIZE(sata_efivars))
			return NULL;

		break;
	case SYS_DEV_VMD:
		for (i = 0; i < ARRAY_SIZE(vmd_efivars); i++) {
			if (!read_efi_variable(&orom, sizeof(orom),
						vmd_efivars[i], VENDOR_GUID))
				break;
		}

		if (i == ARRAY_SIZE(vmd_efivars))
			return NULL;

		break;
	default:
		return NULL;
	}

	ret = add_orom(&orom);
	add_orom_device_id(ret, hba->dev_id);
	ret->type = hba->type;

	return &ret->orom;
}

const struct imsm_orom *find_imsm_nvme(struct sys_dev *hba)
{
	static struct orom_entry *nvme_orom;

	if (hba->type != SYS_DEV_NVME)
		return NULL;

	if (!nvme_orom) {
		struct imsm_orom nvme_orom_compat = {
			.signature = IMSM_NVME_OROM_COMPAT_SIGNATURE,
			.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
						IMSM_OROM_RLC_RAID10 | IMSM_OROM_RLC_RAID5,
			.sss = IMSM_OROM_SSS_4kB | IMSM_OROM_SSS_8kB |
						IMSM_OROM_SSS_16kB | IMSM_OROM_SSS_32kB |
						IMSM_OROM_SSS_64kB | IMSM_OROM_SSS_128kB,
			.dpa = IMSM_OROM_DISKS_PER_ARRAY_NVME,
			.tds = IMSM_OROM_TOTAL_DISKS_NVME,
			.vpa = IMSM_OROM_VOLUMES_PER_ARRAY,
			.vphba = IMSM_OROM_TOTAL_DISKS_NVME / 2 * IMSM_OROM_VOLUMES_PER_ARRAY,
			.attr = IMSM_OROM_ATTR_2TB | IMSM_OROM_ATTR_2TB_DISK,
			.driver_features = IMSM_OROM_CAPABILITIES_EnterpriseSystem
		};
		nvme_orom = add_orom(&nvme_orom_compat);
	}
	add_orom_device_id(nvme_orom, hba->dev_id);
	nvme_orom->type = SYS_DEV_NVME;
	return &nvme_orom->orom;
}

const struct imsm_orom *find_imsm_capability(struct sys_dev *hba)
{
	const struct imsm_orom *cap = get_orom_by_device_id(hba->dev_id);

	if (cap)
		return cap;

	if (hba->type == SYS_DEV_NVME)
		return find_imsm_nvme(hba);
	if ((cap = find_imsm_efi(hba)) != NULL)
		return cap;
	if ((cap = find_imsm_hba_orom(hba)) != NULL)
		return cap;

	return NULL;
}

/* Check whether the nvme device is represented by nvme subsytem,
 * if yes virtual path should be changed to hardware device path,
 * to allow IMSM capabilities detection.
 * Returns:
 *	hardware path to device - if the device is represented via
 *		nvme virtual subsytem
 *	NULL - if the device is not represented via nvme virtual subsytem
 */
char *get_nvme_multipath_dev_hw_path(const char *dev_path)
{
	DIR *dir;
	struct dirent *ent;
	char *rp = NULL;

	if (strncmp(dev_path, NVME_SUBSYS_PATH, strlen(NVME_SUBSYS_PATH)) != 0)
		return NULL;

	dir = opendir(dev_path);
	if (!dir)
		return NULL;

	for (ent = readdir(dir); ent; ent = readdir(dir)) {
		char buf[strlen(dev_path) + strlen(ent->d_name) + 1];

		/* Check if dir is a controller, ignore namespaces*/
		if (!(strncmp(ent->d_name, "nvme", 4) == 0) ||
		    (strrchr(ent->d_name, 'n') != &ent->d_name[0]))
			continue;

		sprintf(buf, "%s/%s", dev_path, ent->d_name);
		rp = realpath(buf, NULL);
		break;
	}

	closedir(dir);
	return rp;
}

/* Description: Return part or whole realpath for the dev
 * Parameters:
 *	dev - the device to be quered
 *	dev_level - level of "/device" entries. It allows to caller to access
 *		    virtual or physical devices which are on "path" to quered
 *		    one.
 *	buf - optional, must be PATH_MAX size. If set, then will be used.
 */
char *devt_to_devpath(dev_t dev, int dev_level, char *buf)
{
	char device[PATH_MAX];
	char *hw_path;
	int i;
	unsigned long device_free_len = sizeof(device) - 1;
	char dev_str[] = "/device";
	unsigned long dev_str_len = strlen(dev_str);

	snprintf(device, sizeof(device), "/sys/dev/block/%d:%d", major(dev),
		 minor(dev));

	/* If caller wants block device, return path to it even if it is exposed
	 * via virtual layer.
	 */
	if (dev_level == 0)
		return realpath(device, buf);

	device_free_len -= strlen(device);
	for (i = 0; i < dev_level; i++) {
		if (device_free_len < dev_str_len)
			return NULL;

		strncat(device, dev_str, device_free_len);

		/* Resolve nvme-subsystem abstraction if needed
		 */
		device_free_len -= dev_str_len;
		if (i == 0) {
			char rp[PATH_MAX];

			if (!realpath(device, rp))
				return NULL;
			hw_path = get_nvme_multipath_dev_hw_path(rp);
			if (hw_path) {
				strcpy(device, hw_path);
				device_free_len = sizeof(device) -
						  strlen(device) - 1;
				free(hw_path);
			}
		}
	}

	return realpath(device, buf);
}

char *diskfd_to_devpath(int fd, int dev_level, char *buf)
{
	/* return the device path for a disk, return NULL on error or fd
	 * refers to a partition
	 */
	struct stat st;

	if (fstat(fd, &st) != 0)
		return NULL;
	if (!S_ISBLK(st.st_mode))
		return NULL;

	return devt_to_devpath(st.st_rdev, dev_level, buf);
}

int path_attached_to_hba(const char *disk_path, const char *hba_path)
{
	int rc;

	if (check_env("IMSM_TEST_AHCI_DEV") ||
	    check_env("IMSM_TEST_SCU_DEV")) {
		return 1;
	}

	if (!disk_path || !hba_path)
		return 0;
	dprintf("hba: %s - disk: %s\n", hba_path, disk_path);
	if (strncmp(disk_path, hba_path, strlen(hba_path)) == 0)
		rc = 1;
	else
		rc = 0;

	return rc;
}

int devt_attached_to_hba(dev_t dev, const char *hba_path)
{
	char *disk_path = devt_to_devpath(dev, 1, NULL);
	int rc = path_attached_to_hba(disk_path, hba_path);

	if (disk_path)
		free(disk_path);

	return rc;
}

int disk_attached_to_hba(int fd, const char *hba_path)
{
	char *disk_path = diskfd_to_devpath(fd, 1, NULL);
	int rc = path_attached_to_hba(disk_path, hba_path);

	if (disk_path)
		free(disk_path);

	return rc;
}

char *vmd_domain_to_controller(struct sys_dev *hba, char *buf)
{
	struct dirent *ent;
	DIR *dir;
	char path[PATH_MAX];

	if (!hba)
		return NULL;

	if (hba->type != SYS_DEV_VMD)
		return NULL;

	dir = opendir("/sys/bus/pci/drivers/vmd");
	if (!dir)
		return NULL;

	for (ent = readdir(dir); ent; ent = readdir(dir)) {
		sprintf(path, "/sys/bus/pci/drivers/vmd/%s/domain/device",
			ent->d_name);

		if (!realpath(path, buf))
			continue;

		if (strncmp(buf, hba->path, strlen(buf)) == 0) {
			sprintf(path, "/sys/bus/pci/drivers/vmd/%s", ent->d_name);
			closedir(dir);
			return realpath(path, buf);
		}
	}

	closedir(dir);
	return NULL;
}

/* Scan over all controller's namespaces and compare nsid value to verify if
 * current one is supported. The routine doesn't check IMSM capabilities for
 * namespace. Only one nvme namespace is supported by IMSM.
 * Paramteres:
 *	fd - open descriptor to the nvme namespace
 *	verbose - error logging level
 * Returns:
 *	1 - if namespace is supported
 *	0 - otherwise
 */
int imsm_is_nvme_namespace_supported(int fd, int verbose)
{
	DIR *dir = NULL;
	struct dirent *ent;
	char cntrl_path[PATH_MAX];
	char ns_path[PATH_MAX];
	unsigned long long lowest_nsid = ULLONG_MAX;
	unsigned long long this_nsid;
	int rv = 0;


	if (!diskfd_to_devpath(fd, 1, cntrl_path) ||
	    !diskfd_to_devpath(fd, 0, ns_path)) {
		if (verbose)
			pr_err("Cannot get device paths\n");
		goto abort;
	}


	if (devpath_to_ll(ns_path, "nsid", &this_nsid)) {
		if (verbose)
			pr_err("Cannot read nsid value for %s",
			       basename(ns_path));
		goto abort;
	}

	dir = opendir(cntrl_path);
	if (!dir)
		goto abort;

	/* The lowest nvme namespace is supported */
	for (ent = readdir(dir); ent; ent = readdir(dir)) {
		unsigned long long curr_nsid;
		char curr_ns_path[PATH_MAX + 256];

		if (!strstr(ent->d_name, "nvme"))
			continue;

		snprintf(curr_ns_path, sizeof(curr_ns_path), "%s/%s",
			 cntrl_path, ent->d_name);

		if (devpath_to_ll(curr_ns_path, "nsid", &curr_nsid))
			goto abort;

		if (lowest_nsid > curr_nsid)
			lowest_nsid = curr_nsid;
	}

	if (this_nsid == lowest_nsid)
		rv = 1;
	else if (verbose)
		pr_err("IMSM is supported on the lowest NVMe namespace\n");

abort:
	if (dir)
		closedir(dir);

	return rv;
}

/* Verify if multipath is supported by NVMe controller
 * Returns:
 *	0 - not supported
 *	1 - supported
 */
int is_multipath_nvme(int disk_fd)
{
	char ns_path[PATH_MAX];

	if (!diskfd_to_devpath(disk_fd, 0, ns_path))
		return 0;

	if (strncmp(ns_path, NVME_SUBSYS_PATH, strlen(NVME_SUBSYS_PATH)) == 0)
		return 1;

	return 0;
}