summaryrefslogtreecommitdiff
path: root/drivers/target/target_core_rd.c
blob: 98e83ac5661bcfe5b3b7b98d6c9fbf21bb27c14e (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
/*******************************************************************************
 * Filename:  target_core_rd.c
 *
 * This file contains the Storage Engine <-> Ramdisk transport
 * specific functions.
 *
 * (c) Copyright 2003-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 ******************************************************************************/

#include <linux/string.h>
#include <linux/parser.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_backend_configfs.h>

#include "target_core_rd.h"

static inline struct rd_dev *RD_DEV(struct se_device *dev)
{
	return container_of(dev, struct rd_dev, dev);
}

/*	rd_attach_hba(): (Part of se_subsystem_api_t template)
 *
 *
 */
static int rd_attach_hba(struct se_hba *hba, u32 host_id)
{
	struct rd_host *rd_host;

	rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
	if (!rd_host) {
		pr_err("Unable to allocate memory for struct rd_host\n");
		return -ENOMEM;
	}

	rd_host->rd_host_id = host_id;

	hba->hba_ptr = rd_host;

	pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
		" Generic Target Core Stack %s\n", hba->hba_id,
		RD_HBA_VERSION, TARGET_CORE_MOD_VERSION);

	return 0;
}

static void rd_detach_hba(struct se_hba *hba)
{
	struct rd_host *rd_host = hba->hba_ptr;

	pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
		" Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);

	kfree(rd_host);
	hba->hba_ptr = NULL;
}

static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
				 u32 sg_table_count)
{
	struct page *pg;
	struct scatterlist *sg;
	u32 i, j, page_count = 0, sg_per_table;

	for (i = 0; i < sg_table_count; i++) {
		sg = sg_table[i].sg_table;
		sg_per_table = sg_table[i].rd_sg_count;

		for (j = 0; j < sg_per_table; j++) {
			pg = sg_page(&sg[j]);
			if (pg) {
				__free_page(pg);
				page_count++;
			}
		}
		kfree(sg);
	}

	kfree(sg_table);
	return page_count;
}

static void rd_release_device_space(struct rd_dev *rd_dev)
{
	u32 page_count;

	if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
		return;

	page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
					  rd_dev->sg_table_count);

	pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
		" Device ID: %u, pages %u in %u tables total bytes %lu\n",
		rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
		rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);

	rd_dev->sg_table_array = NULL;
	rd_dev->sg_table_count = 0;
}


/*	rd_build_device_space():
 *
 *
 */
static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
				 u32 total_sg_needed, unsigned char init_payload)
{
	u32 i = 0, j, page_offset = 0, sg_per_table;
	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
				sizeof(struct scatterlist));
	struct page *pg;
	struct scatterlist *sg;
	unsigned char *p;

	while (total_sg_needed) {
		sg_per_table = (total_sg_needed > max_sg_per_table) ?
			max_sg_per_table : total_sg_needed;

		sg = kzalloc(sg_per_table * sizeof(struct scatterlist),
				GFP_KERNEL);
		if (!sg) {
			pr_err("Unable to allocate scatterlist array"
				" for struct rd_dev\n");
			return -ENOMEM;
		}

		sg_init_table(sg, sg_per_table);

		sg_table[i].sg_table = sg;
		sg_table[i].rd_sg_count = sg_per_table;
		sg_table[i].page_start_offset = page_offset;
		sg_table[i++].page_end_offset = (page_offset + sg_per_table)
						- 1;

		for (j = 0; j < sg_per_table; j++) {
			pg = alloc_pages(GFP_KERNEL, 0);
			if (!pg) {
				pr_err("Unable to allocate scatterlist"
					" pages for struct rd_dev_sg_table\n");
				return -ENOMEM;
			}
			sg_assign_page(&sg[j], pg);
			sg[j].length = PAGE_SIZE;

			p = kmap(pg);
			memset(p, init_payload, PAGE_SIZE);
			kunmap(pg);
		}

		page_offset += sg_per_table;
		total_sg_needed -= sg_per_table;
	}

	return 0;
}

static int rd_build_device_space(struct rd_dev *rd_dev)
{
	struct rd_dev_sg_table *sg_table;
	u32 sg_tables, total_sg_needed;
	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
				sizeof(struct scatterlist));
	int rc;

	if (rd_dev->rd_page_count <= 0) {
		pr_err("Illegal page count: %u for Ramdisk device\n",
		       rd_dev->rd_page_count);
		return -EINVAL;
	}

	/* Don't need backing pages for NULLIO */
	if (rd_dev->rd_flags & RDF_NULLIO)
		return 0;

	total_sg_needed = rd_dev->rd_page_count;

	sg_tables = (total_sg_needed / max_sg_per_table) + 1;

	sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
	if (!sg_table) {
		pr_err("Unable to allocate memory for Ramdisk"
		       " scatterlist tables\n");
		return -ENOMEM;
	}

	rd_dev->sg_table_array = sg_table;
	rd_dev->sg_table_count = sg_tables;

	rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
	if (rc)
		return rc;

	pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
		 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
		 rd_dev->rd_dev_id, rd_dev->rd_page_count,
		 rd_dev->sg_table_count);

	return 0;
}

static void rd_release_prot_space(struct rd_dev *rd_dev)
{
	u32 page_count;

	if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count)
		return;

	page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array,
					  rd_dev->sg_prot_count);

	pr_debug("CORE_RD[%u] - Released protection space for Ramdisk"
		 " Device ID: %u, pages %u in %u tables total bytes %lu\n",
		 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
		 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);

	rd_dev->sg_prot_array = NULL;
	rd_dev->sg_prot_count = 0;
}

static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size)
{
	struct rd_dev_sg_table *sg_table;
	u32 total_sg_needed, sg_tables;
	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
				sizeof(struct scatterlist));
	int rc;

	if (rd_dev->rd_flags & RDF_NULLIO)
		return 0;
	/*
	 * prot_length=8byte dif data
	 * tot sg needed = rd_page_count * (PGSZ/block_size) *
	 * 		   (prot_length/block_size) + pad
	 * PGSZ canceled each other.
	 */
	total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;

	sg_tables = (total_sg_needed / max_sg_per_table) + 1;

	sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
	if (!sg_table) {
		pr_err("Unable to allocate memory for Ramdisk protection"
		       " scatterlist tables\n");
		return -ENOMEM;
	}

	rd_dev->sg_prot_array = sg_table;
	rd_dev->sg_prot_count = sg_tables;

	rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff);
	if (rc)
		return rc;

	pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of"
		 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
		 rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count);

	return 0;
}

static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
{
	struct rd_dev *rd_dev;
	struct rd_host *rd_host = hba->hba_ptr;

	rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
	if (!rd_dev) {
		pr_err("Unable to allocate memory for struct rd_dev\n");
		return NULL;
	}

	rd_dev->rd_host = rd_host;

	return &rd_dev->dev;
}

static int rd_configure_device(struct se_device *dev)
{
	struct rd_dev *rd_dev = RD_DEV(dev);
	struct rd_host *rd_host = dev->se_hba->hba_ptr;
	int ret;

	if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
		pr_debug("Missing rd_pages= parameter\n");
		return -EINVAL;
	}

	ret = rd_build_device_space(rd_dev);
	if (ret < 0)
		goto fail;

	dev->dev_attrib.hw_block_size = RD_BLOCKSIZE;
	dev->dev_attrib.hw_max_sectors = UINT_MAX;
	dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;

	rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;

	pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
		" %u pages in %u tables, %lu total bytes\n",
		rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
		rd_dev->sg_table_count,
		(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));

	return 0;

fail:
	rd_release_device_space(rd_dev);
	return ret;
}

static void rd_free_device(struct se_device *dev)
{
	struct rd_dev *rd_dev = RD_DEV(dev);

	rd_release_device_space(rd_dev);
	kfree(rd_dev);
}

static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
{
	struct rd_dev_sg_table *sg_table;
	u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
				sizeof(struct scatterlist));

	i = page / sg_per_table;
	if (i < rd_dev->sg_table_count) {
		sg_table = &rd_dev->sg_table_array[i];
		if ((sg_table->page_start_offset <= page) &&
		    (sg_table->page_end_offset >= page))
			return sg_table;
	}

	pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n",
			page);

	return NULL;
}

static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page)
{
	struct rd_dev_sg_table *sg_table;
	u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
				sizeof(struct scatterlist));

	i = page / sg_per_table;
	if (i < rd_dev->sg_prot_count) {
		sg_table = &rd_dev->sg_prot_array[i];
		if ((sg_table->page_start_offset <= page) &&
		     (sg_table->page_end_offset >= page))
			return sg_table;
	}

	pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n",
			page);

	return NULL;
}

static sense_reason_t
rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
	      enum dma_data_direction data_direction)
{
	struct se_device *se_dev = cmd->se_dev;
	struct rd_dev *dev = RD_DEV(se_dev);
	struct rd_dev_sg_table *table;
	struct scatterlist *rd_sg;
	struct sg_mapping_iter m;
	u32 rd_offset;
	u32 rd_size;
	u32 rd_page;
	u32 src_len;
	u64 tmp;
	sense_reason_t rc;

	if (dev->rd_flags & RDF_NULLIO) {
		target_complete_cmd(cmd, SAM_STAT_GOOD);
		return 0;
	}

	tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size;
	rd_offset = do_div(tmp, PAGE_SIZE);
	rd_page = tmp;
	rd_size = cmd->data_length;

	table = rd_get_sg_table(dev, rd_page);
	if (!table)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

	rd_sg = &table->sg_table[rd_page - table->page_start_offset];

	pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
			dev->rd_dev_id,
			data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
			cmd->t_task_lba, rd_size, rd_page, rd_offset);

	if (cmd->prot_type && data_direction == DMA_TO_DEVICE) {
		struct rd_dev_sg_table *prot_table;
		struct scatterlist *prot_sg;
		u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
		u32 prot_offset, prot_page;

		tmp = cmd->t_task_lba * se_dev->prot_length;
		prot_offset = do_div(tmp, PAGE_SIZE);
		prot_page = tmp;

		prot_table = rd_get_prot_table(dev, prot_page);
		if (!prot_table)
			return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

		prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];

		rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0,
					  prot_sg, prot_offset);
		if (rc)
			return rc;
	}

	src_len = PAGE_SIZE - rd_offset;
	sg_miter_start(&m, sgl, sgl_nents,
			data_direction == DMA_FROM_DEVICE ?
				SG_MITER_TO_SG : SG_MITER_FROM_SG);
	while (rd_size) {
		u32 len;
		void *rd_addr;

		sg_miter_next(&m);
		if (!(u32)m.length) {
			pr_debug("RD[%u]: invalid sgl %p len %zu\n",
				 dev->rd_dev_id, m.addr, m.length);
			sg_miter_stop(&m);
			return TCM_INCORRECT_AMOUNT_OF_DATA;
		}
		len = min((u32)m.length, src_len);
		if (len > rd_size) {
			pr_debug("RD[%u]: size underrun page %d offset %d "
				 "size %d\n", dev->rd_dev_id,
				 rd_page, rd_offset, rd_size);
			len = rd_size;
		}
		m.consumed = len;

		rd_addr = sg_virt(rd_sg) + rd_offset;

		if (data_direction == DMA_FROM_DEVICE)
			memcpy(m.addr, rd_addr, len);
		else
			memcpy(rd_addr, m.addr, len);

		rd_size -= len;
		if (!rd_size)
			continue;

		src_len -= len;
		if (src_len) {
			rd_offset += len;
			continue;
		}

		/* rd page completed, next one please */
		rd_page++;
		rd_offset = 0;
		src_len = PAGE_SIZE;
		if (rd_page <= table->page_end_offset) {
			rd_sg++;
			continue;
		}

		table = rd_get_sg_table(dev, rd_page);
		if (!table) {
			sg_miter_stop(&m);
			return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
		}

		/* since we increment, the first sg entry is correct */
		rd_sg = table->sg_table;
	}
	sg_miter_stop(&m);

	if (cmd->prot_type && data_direction == DMA_FROM_DEVICE) {
		struct rd_dev_sg_table *prot_table;
		struct scatterlist *prot_sg;
		u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
		u32 prot_offset, prot_page;

		tmp = cmd->t_task_lba * se_dev->prot_length;
		prot_offset = do_div(tmp, PAGE_SIZE);
		prot_page = tmp;

		prot_table = rd_get_prot_table(dev, prot_page);
		if (!prot_table)
			return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

		prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];

		rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
					 prot_sg, prot_offset);
		if (rc)
			return rc;
	}

	target_complete_cmd(cmd, SAM_STAT_GOOD);
	return 0;
}

enum {
	Opt_rd_pages, Opt_rd_nullio, Opt_err
};

static match_table_t tokens = {
	{Opt_rd_pages, "rd_pages=%d"},
	{Opt_rd_nullio, "rd_nullio=%d"},
	{Opt_err, NULL}
};

static ssize_t rd_set_configfs_dev_params(struct se_device *dev,
		const char *page, ssize_t count)
{
	struct rd_dev *rd_dev = RD_DEV(dev);
	char *orig, *ptr, *opts;
	substring_t args[MAX_OPT_ARGS];
	int ret = 0, arg, token;

	opts = kstrdup(page, GFP_KERNEL);
	if (!opts)
		return -ENOMEM;

	orig = opts;

	while ((ptr = strsep(&opts, ",\n")) != NULL) {
		if (!*ptr)
			continue;

		token = match_token(ptr, tokens, args);
		switch (token) {
		case Opt_rd_pages:
			match_int(args, &arg);
			rd_dev->rd_page_count = arg;
			pr_debug("RAMDISK: Referencing Page"
				" Count: %u\n", rd_dev->rd_page_count);
			rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
			break;
		case Opt_rd_nullio:
			match_int(args, &arg);
			if (arg != 1)
				break;

			pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg);
			rd_dev->rd_flags |= RDF_NULLIO;
			break;
		default:
			break;
		}
	}

	kfree(orig);
	return (!ret) ? count : ret;
}

static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b)
{
	struct rd_dev *rd_dev = RD_DEV(dev);

	ssize_t bl = sprintf(b, "TCM RamDisk ID: %u  RamDisk Makeup: rd_mcp\n",
			rd_dev->rd_dev_id);
	bl += sprintf(b + bl, "        PAGES/PAGE_SIZE: %u*%lu"
			"  SG_table_count: %u  nullio: %d\n", rd_dev->rd_page_count,
			PAGE_SIZE, rd_dev->sg_table_count,
			!!(rd_dev->rd_flags & RDF_NULLIO));
	return bl;
}

static sector_t rd_get_blocks(struct se_device *dev)
{
	struct rd_dev *rd_dev = RD_DEV(dev);

	unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
			dev->dev_attrib.block_size) - 1;

	return blocks_long;
}

static int rd_init_prot(struct se_device *dev)
{
	struct rd_dev *rd_dev = RD_DEV(dev);

        if (!dev->dev_attrib.pi_prot_type)
		return 0;

	return rd_build_prot_space(rd_dev, dev->prot_length,
				   dev->dev_attrib.block_size);
}

static void rd_free_prot(struct se_device *dev)
{
	struct rd_dev *rd_dev = RD_DEV(dev);

	rd_release_prot_space(rd_dev);
}

static struct sbc_ops rd_sbc_ops = {
	.execute_rw		= rd_execute_rw,
};

static sense_reason_t
rd_parse_cdb(struct se_cmd *cmd)
{
	return sbc_parse_cdb(cmd, &rd_sbc_ops);
}

DEF_TB_DEFAULT_ATTRIBS(rd_mcp);

static struct configfs_attribute *rd_mcp_backend_dev_attrs[] = {
	&rd_mcp_dev_attrib_emulate_model_alias.attr,
	&rd_mcp_dev_attrib_emulate_dpo.attr,
	&rd_mcp_dev_attrib_emulate_fua_write.attr,
	&rd_mcp_dev_attrib_emulate_fua_read.attr,
	&rd_mcp_dev_attrib_emulate_write_cache.attr,
	&rd_mcp_dev_attrib_emulate_ua_intlck_ctrl.attr,
	&rd_mcp_dev_attrib_emulate_tas.attr,
	&rd_mcp_dev_attrib_emulate_tpu.attr,
	&rd_mcp_dev_attrib_emulate_tpws.attr,
	&rd_mcp_dev_attrib_emulate_caw.attr,
	&rd_mcp_dev_attrib_emulate_3pc.attr,
	&rd_mcp_dev_attrib_pi_prot_type.attr,
	&rd_mcp_dev_attrib_hw_pi_prot_type.attr,
	&rd_mcp_dev_attrib_pi_prot_format.attr,
	&rd_mcp_dev_attrib_enforce_pr_isids.attr,
	&rd_mcp_dev_attrib_is_nonrot.attr,
	&rd_mcp_dev_attrib_emulate_rest_reord.attr,
	&rd_mcp_dev_attrib_force_pr_aptpl.attr,
	&rd_mcp_dev_attrib_hw_block_size.attr,
	&rd_mcp_dev_attrib_block_size.attr,
	&rd_mcp_dev_attrib_hw_max_sectors.attr,
	&rd_mcp_dev_attrib_optimal_sectors.attr,
	&rd_mcp_dev_attrib_hw_queue_depth.attr,
	&rd_mcp_dev_attrib_queue_depth.attr,
	&rd_mcp_dev_attrib_max_unmap_lba_count.attr,
	&rd_mcp_dev_attrib_max_unmap_block_desc_count.attr,
	&rd_mcp_dev_attrib_unmap_granularity.attr,
	&rd_mcp_dev_attrib_unmap_granularity_alignment.attr,
	&rd_mcp_dev_attrib_max_write_same_len.attr,
	NULL,
};

static struct se_subsystem_api rd_mcp_template = {
	.name			= "rd_mcp",
	.inquiry_prod		= "RAMDISK-MCP",
	.inquiry_rev		= RD_MCP_VERSION,
	.transport_type		= TRANSPORT_PLUGIN_VHBA_VDEV,
	.attach_hba		= rd_attach_hba,
	.detach_hba		= rd_detach_hba,
	.alloc_device		= rd_alloc_device,
	.configure_device	= rd_configure_device,
	.free_device		= rd_free_device,
	.parse_cdb		= rd_parse_cdb,
	.set_configfs_dev_params = rd_set_configfs_dev_params,
	.show_configfs_dev_params = rd_show_configfs_dev_params,
	.get_device_type	= sbc_get_device_type,
	.get_blocks		= rd_get_blocks,
	.init_prot		= rd_init_prot,
	.free_prot		= rd_free_prot,
};

int __init rd_module_init(void)
{
	struct target_backend_cits *tbc = &rd_mcp_template.tb_cits;
	int ret;

	target_core_setup_sub_cits(&rd_mcp_template);
	tbc->tb_dev_attrib_cit.ct_attrs = rd_mcp_backend_dev_attrs;

	ret = transport_subsystem_register(&rd_mcp_template);
	if (ret < 0) {
		return ret;
	}

	return 0;
}

void rd_module_exit(void)
{
	transport_subsystem_release(&rd_mcp_template);
}