vlun.c 33.6 KB
Newer Older
M
Matthew R. Ochs 已提交
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
/*
 * CXL Flash Device Driver
 *
 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
 *             Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
 *
 * Copyright (C) 2015 IBM Corporation
 *
 * 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.
 */

#include <linux/syscalls.h>
#include <misc/cxl.h>
#include <asm/unaligned.h>
#include <asm/bitsperlong.h>

#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <uapi/scsi/cxlflash_ioctl.h>

#include "sislite.h"
#include "common.h"
#include "vlun.h"
#include "superpipe.h"

/**
 * marshal_virt_to_resize() - translate uvirtual to resize structure
 * @virt:	Source structure from which to translate/copy.
 * @resize:	Destination structure for the translate/copy.
 */
static void marshal_virt_to_resize(struct dk_cxlflash_uvirtual *virt,
				   struct dk_cxlflash_resize *resize)
{
	resize->hdr = virt->hdr;
	resize->context_id = virt->context_id;
	resize->rsrc_handle = virt->rsrc_handle;
	resize->req_size = virt->lun_size;
	resize->last_lba = virt->last_lba;
}

/**
 * marshal_clone_to_rele() - translate clone to release structure
 * @clone:	Source structure from which to translate/copy.
 * @rele:	Destination structure for the translate/copy.
 */
static void marshal_clone_to_rele(struct dk_cxlflash_clone *clone,
				  struct dk_cxlflash_release *release)
{
	release->hdr = clone->hdr;
	release->context_id = clone->context_id_dst;
}

/**
 * ba_init() - initializes a block allocator
 * @ba_lun:	Block allocator to initialize.
 *
 * Return: 0 on success, -errno on failure
 */
static int ba_init(struct ba_lun *ba_lun)
{
	struct ba_lun_info *bali = NULL;
	int lun_size_au = 0, i = 0;
	int last_word_underflow = 0;
	u64 *lam;

	pr_debug("%s: Initializing LUN: lun_id = %llX, "
		 "ba_lun->lsize = %lX, ba_lun->au_size = %lX\n",
		__func__, ba_lun->lun_id, ba_lun->lsize, ba_lun->au_size);

	/* Calculate bit map size */
	lun_size_au = ba_lun->lsize / ba_lun->au_size;
	if (lun_size_au == 0) {
		pr_debug("%s: Requested LUN size of 0!\n", __func__);
		return -EINVAL;
	}

	/* Allocate lun information container */
	bali = kzalloc(sizeof(struct ba_lun_info), GFP_KERNEL);
	if (unlikely(!bali)) {
		pr_err("%s: Failed to allocate lun_info for lun_id %llX\n",
		       __func__, ba_lun->lun_id);
		return -ENOMEM;
	}

	bali->total_aus = lun_size_au;
	bali->lun_bmap_size = lun_size_au / BITS_PER_LONG;

	if (lun_size_au % BITS_PER_LONG)
		bali->lun_bmap_size++;

	/* Allocate bitmap space */
	bali->lun_alloc_map = kzalloc((bali->lun_bmap_size * sizeof(u64)),
				      GFP_KERNEL);
	if (unlikely(!bali->lun_alloc_map)) {
		pr_err("%s: Failed to allocate lun allocation map: "
		       "lun_id = %llX\n", __func__, ba_lun->lun_id);
		kfree(bali);
		return -ENOMEM;
	}

	/* Initialize the bit map size and set all bits to '1' */
	bali->free_aun_cnt = lun_size_au;

	for (i = 0; i < bali->lun_bmap_size; i++)
		bali->lun_alloc_map[i] = 0xFFFFFFFFFFFFFFFFULL;

	/* If the last word not fully utilized, mark extra bits as allocated */
	last_word_underflow = (bali->lun_bmap_size * BITS_PER_LONG);
	last_word_underflow -= bali->free_aun_cnt;
	if (last_word_underflow > 0) {
		lam = &bali->lun_alloc_map[bali->lun_bmap_size - 1];
		for (i = (HIBIT - last_word_underflow + 1);
		     i < BITS_PER_LONG;
		     i++)
			clear_bit(i, (ulong *)lam);
	}

	/* Initialize high elevator index, low/curr already at 0 from kzalloc */
	bali->free_high_idx = bali->lun_bmap_size;

	/* Allocate clone map */
	bali->aun_clone_map = kzalloc((bali->total_aus * sizeof(u8)),
				      GFP_KERNEL);
	if (unlikely(!bali->aun_clone_map)) {
		pr_err("%s: Failed to allocate clone map: lun_id = %llX\n",
		       __func__, ba_lun->lun_id);
		kfree(bali->lun_alloc_map);
		kfree(bali);
		return -ENOMEM;
	}

	/* Pass the allocated lun info as a handle to the user */
	ba_lun->ba_lun_handle = bali;

	pr_debug("%s: Successfully initialized the LUN: "
		 "lun_id = %llX, bitmap size = %X, free_aun_cnt = %llX\n",
		__func__, ba_lun->lun_id, bali->lun_bmap_size,
		bali->free_aun_cnt);
	return 0;
}

/**
 * find_free_range() - locates a free bit within the block allocator
 * @low:	First word in block allocator to start search.
 * @high:	Last word in block allocator to search.
 * @bali:	LUN information structure owning the block allocator to search.
 * @bit_word:	Passes back the word in the block allocator owning the free bit.
 *
 * Return: The bit position within the passed back word, -1 on failure
 */
static int find_free_range(u32 low,
			   u32 high,
			   struct ba_lun_info *bali, int *bit_word)
{
	int i;
	u64 bit_pos = -1;
	ulong *lam, num_bits;

	for (i = low; i < high; i++)
		if (bali->lun_alloc_map[i] != 0) {
			lam = (ulong *)&bali->lun_alloc_map[i];
			num_bits = (sizeof(*lam) * BITS_PER_BYTE);
			bit_pos = find_first_bit(lam, num_bits);

			pr_devel("%s: Found free bit %llX in lun "
				 "map entry %llX at bitmap index = %X\n",
				 __func__, bit_pos, bali->lun_alloc_map[i],
				 i);

			*bit_word = i;
			bali->free_aun_cnt--;
			clear_bit(bit_pos, lam);
			break;
		}

	return bit_pos;
}

/**
 * ba_alloc() - allocates a block from the block allocator
 * @ba_lun:	Block allocator from which to allocate a block.
 *
 * Return: The allocated block, -1 on failure
 */
static u64 ba_alloc(struct ba_lun *ba_lun)
{
	u64 bit_pos = -1;
	int bit_word = 0;
	struct ba_lun_info *bali = NULL;

	bali = ba_lun->ba_lun_handle;

	pr_debug("%s: Received block allocation request: "
		 "lun_id = %llX, free_aun_cnt = %llX\n",
		 __func__, ba_lun->lun_id, bali->free_aun_cnt);

	if (bali->free_aun_cnt == 0) {
		pr_debug("%s: No space left on LUN: lun_id = %llX\n",
			 __func__, ba_lun->lun_id);
		return -1ULL;
	}

	/* Search to find a free entry, curr->high then low->curr */
	bit_pos = find_free_range(bali->free_curr_idx,
				  bali->free_high_idx, bali, &bit_word);
	if (bit_pos == -1) {
		bit_pos = find_free_range(bali->free_low_idx,
					  bali->free_curr_idx,
					  bali, &bit_word);
		if (bit_pos == -1) {
			pr_debug("%s: Could not find an allocation unit on LUN:"
				 " lun_id = %llX\n", __func__, ba_lun->lun_id);
			return -1ULL;
		}
	}

	/* Update the free_curr_idx */
	if (bit_pos == HIBIT)
		bali->free_curr_idx = bit_word + 1;
	else
		bali->free_curr_idx = bit_word;

	pr_debug("%s: Allocating AU number %llX, on lun_id %llX, "
		 "free_aun_cnt = %llX\n", __func__,
		 ((bit_word * BITS_PER_LONG) + bit_pos), ba_lun->lun_id,
		 bali->free_aun_cnt);

	return (u64) ((bit_word * BITS_PER_LONG) + bit_pos);
}

/**
 * validate_alloc() - validates the specified block has been allocated
 * @ba_lun_info:	LUN info owning the block allocator.
 * @aun:		Block to validate.
 *
 * Return: 0 on success, -1 on failure
 */
static int validate_alloc(struct ba_lun_info *bali, u64 aun)
{
	int idx = 0, bit_pos = 0;

	idx = aun / BITS_PER_LONG;
	bit_pos = aun % BITS_PER_LONG;

	if (test_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx]))
		return -1;

	return 0;
}

/**
 * ba_free() - frees a block from the block allocator
 * @ba_lun:	Block allocator from which to allocate a block.
 * @to_free:	Block to free.
 *
 * Return: 0 on success, -1 on failure
 */
static int ba_free(struct ba_lun *ba_lun, u64 to_free)
{
	int idx = 0, bit_pos = 0;
	struct ba_lun_info *bali = NULL;

	bali = ba_lun->ba_lun_handle;

	if (validate_alloc(bali, to_free)) {
		pr_debug("%s: The AUN %llX is not allocated on lun_id %llX\n",
			 __func__, to_free, ba_lun->lun_id);
		return -1;
	}

	pr_debug("%s: Received a request to free AU %llX on lun_id %llX, "
		 "free_aun_cnt = %llX\n", __func__, to_free, ba_lun->lun_id,
		 bali->free_aun_cnt);

	if (bali->aun_clone_map[to_free] > 0) {
		pr_debug("%s: AUN %llX on lun_id %llX has been cloned. Clone "
			 "count = %X\n", __func__, to_free, ba_lun->lun_id,
			 bali->aun_clone_map[to_free]);
		bali->aun_clone_map[to_free]--;
		return 0;
	}

	idx = to_free / BITS_PER_LONG;
	bit_pos = to_free % BITS_PER_LONG;

	set_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx]);
	bali->free_aun_cnt++;

	if (idx < bali->free_low_idx)
		bali->free_low_idx = idx;
	else if (idx > bali->free_high_idx)
		bali->free_high_idx = idx;

	pr_debug("%s: Successfully freed AU at bit_pos %X, bit map index %X on "
		 "lun_id %llX, free_aun_cnt = %llX\n", __func__, bit_pos, idx,
		 ba_lun->lun_id, bali->free_aun_cnt);

	return 0;
}

/**
 * ba_clone() - Clone a chunk of the block allocation table
 * @ba_lun:	Block allocator from which to allocate a block.
 * @to_free:	Block to free.
 *
 * Return: 0 on success, -1 on failure
 */
static int ba_clone(struct ba_lun *ba_lun, u64 to_clone)
{
	struct ba_lun_info *bali = ba_lun->ba_lun_handle;

	if (validate_alloc(bali, to_clone)) {
		pr_debug("%s: AUN %llX is not allocated on lun_id %llX\n",
			 __func__, to_clone, ba_lun->lun_id);
		return -1;
	}

	pr_debug("%s: Received a request to clone AUN %llX on lun_id %llX\n",
		 __func__, to_clone, ba_lun->lun_id);

	if (bali->aun_clone_map[to_clone] == MAX_AUN_CLONE_CNT) {
		pr_debug("%s: AUN %llX on lun_id %llX hit max clones already\n",
			 __func__, to_clone, ba_lun->lun_id);
		return -1;
	}

	bali->aun_clone_map[to_clone]++;

	return 0;
}

/**
 * ba_space() - returns the amount of free space left in the block allocator
 * @ba_lun:	Block allocator.
 *
 * Return: Amount of free space in block allocator
 */
static u64 ba_space(struct ba_lun *ba_lun)
{
	struct ba_lun_info *bali = ba_lun->ba_lun_handle;

	return bali->free_aun_cnt;
}

/**
 * cxlflash_ba_terminate() - frees resources associated with the block allocator
 * @ba_lun:	Block allocator.
 *
 * Safe to call in a partially allocated state.
 */
void cxlflash_ba_terminate(struct ba_lun *ba_lun)
{
	struct ba_lun_info *bali = ba_lun->ba_lun_handle;

	if (bali) {
		kfree(bali->aun_clone_map);
		kfree(bali->lun_alloc_map);
		kfree(bali);
		ba_lun->ba_lun_handle = NULL;
	}
}

/**
 * init_vlun() - initializes a LUN for virtual use
 * @lun_info:	LUN information structure that owns the block allocator.
 *
 * Return: 0 on success, -errno on failure
 */
static int init_vlun(struct llun_info *lli)
{
	int rc = 0;
	struct glun_info *gli = lli->parent;
	struct blka *blka = &gli->blka;

	memset(blka, 0, sizeof(*blka));
	mutex_init(&blka->mutex);

	/* LUN IDs are unique per port, save the index instead */
	blka->ba_lun.lun_id = lli->lun_index;
	blka->ba_lun.lsize = gli->max_lba + 1;
	blka->ba_lun.lba_size = gli->blk_len;

	blka->ba_lun.au_size = MC_CHUNK_SIZE;
	blka->nchunk = blka->ba_lun.lsize / MC_CHUNK_SIZE;

	rc = ba_init(&blka->ba_lun);
	if (unlikely(rc))
		pr_debug("%s: cannot init block_alloc, rc=%d\n", __func__, rc);

	pr_debug("%s: returning rc=%d lli=%p\n", __func__, rc, lli);
	return rc;
}

/**
 * write_same16() - sends a SCSI WRITE_SAME16 (0) command to specified LUN
 * @sdev:	SCSI device associated with LUN.
 * @lba:	Logical block address to start write same.
 * @nblks:	Number of logical blocks to write same.
 *
 * Return: 0 on success, -errno on failure
 */
static int write_same16(struct scsi_device *sdev,
			u64 lba,
			u32 nblks)
{
	u8 *cmd_buf = NULL;
	u8 *scsi_cmd = NULL;
	u8 *sense_buf = NULL;
	int rc = 0;
	int result = 0;
	int ws_limit = SISLITE_MAX_WS_BLOCKS;
	u64 offset = lba;
	int left = nblks;
M
Manoj Kumar 已提交
417
	u32 to = sdev->request_queue->rq_timeout;
M
Matthew R. Ochs 已提交
418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436
	struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
	struct device *dev = &cfg->dev->dev;

	cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL);
	scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL);
	sense_buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
	if (unlikely(!cmd_buf || !scsi_cmd || !sense_buf)) {
		rc = -ENOMEM;
		goto out;
	}

	while (left > 0) {

		scsi_cmd[0] = WRITE_SAME_16;
		put_unaligned_be64(offset, &scsi_cmd[2]);
		put_unaligned_be32(ws_limit < left ? ws_limit : left,
				   &scsi_cmd[10]);

		result = scsi_execute(sdev, scsi_cmd, DMA_TO_DEVICE, cmd_buf,
M
Manoj Kumar 已提交
437
				      CMD_BUFSIZE, sense_buf, to, CMD_RETRIES,
438
				      0, NULL);
M
Matthew R. Ochs 已提交
439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
		if (result) {
			dev_err_ratelimited(dev, "%s: command failed for "
					    "offset %lld result=0x%x\n",
					    __func__, offset, result);
			rc = -EIO;
			goto out;
		}
		left -= ws_limit;
		offset += ws_limit;
	}

out:
	kfree(cmd_buf);
	kfree(scsi_cmd);
	kfree(sense_buf);
	pr_debug("%s: returning rc=%d\n", __func__, rc);
	return rc;
}

/**
 * grow_lxt() - expands the translation table associated with the specified RHTE
 * @afu:	AFU associated with the host.
 * @sdev:	SCSI device associated with LUN.
 * @ctxid:	Context ID of context owning the RHTE.
 * @rhndl:	Resource handle associated with the RHTE.
 * @rhte:	Resource handle entry (RHTE).
 * @new_size:	Number of translation entries associated with RHTE.
 *
 * By design, this routine employs a 'best attempt' allocation and will
 * truncate the requested size down if there is not sufficient space in
 * the block allocator to satisfy the request but there does exist some
 * amount of space. The user is made aware of this by returning the size
 * allocated.
 *
 * Return: 0 on success, -errno on failure
 */
static int grow_lxt(struct afu *afu,
		    struct scsi_device *sdev,
		    ctx_hndl_t ctxid,
		    res_hndl_t rhndl,
		    struct sisl_rht_entry *rhte,
		    u64 *new_size)
{
	struct sisl_lxt_entry *lxt = NULL, *lxt_old = NULL;
	struct llun_info *lli = sdev->hostdata;
	struct glun_info *gli = lli->parent;
	struct blka *blka = &gli->blka;
	u32 av_size;
	u32 ngrps, ngrps_old;
	u64 aun;		/* chunk# allocated by block allocator */
	u64 delta = *new_size - rhte->lxt_cnt;
	u64 my_new_size;
	int i, rc = 0;

	/*
	 * Check what is available in the block allocator before re-allocating
	 * LXT array. This is done up front under the mutex which must not be
	 * released until after allocation is complete.
	 */
	mutex_lock(&blka->mutex);
	av_size = ba_space(&blka->ba_lun);
	if (unlikely(av_size <= 0)) {
		pr_debug("%s: ba_space error: av_size %d\n", __func__, av_size);
		mutex_unlock(&blka->mutex);
		rc = -ENOSPC;
		goto out;
	}

	if (av_size < delta)
		delta = av_size;

	lxt_old = rhte->lxt_start;
	ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt);
	ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt + delta);

	if (ngrps != ngrps_old) {
		/* reallocate to fit new size */
		lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps),
			      GFP_KERNEL);
		if (unlikely(!lxt)) {
			mutex_unlock(&blka->mutex);
			rc = -ENOMEM;
			goto out;
		}

		/* copy over all old entries */
		memcpy(lxt, lxt_old, (sizeof(*lxt) * rhte->lxt_cnt));
	} else
		lxt = lxt_old;

	/* nothing can fail from now on */
	my_new_size = rhte->lxt_cnt + delta;

	/* add new entries to the end */
	for (i = rhte->lxt_cnt; i < my_new_size; i++) {
		/*
		 * Due to the earlier check of available space, ba_alloc
		 * cannot fail here. If it did due to internal error,
		 * leave a rlba_base of -1u which will likely be a
		 * invalid LUN (too large).
		 */
		aun = ba_alloc(&blka->ba_lun);
		if ((aun == -1ULL) || (aun >= blka->nchunk))
			pr_debug("%s: ba_alloc error: allocated chunk# %llX, "
				 "max %llX\n", __func__, aun, blka->nchunk - 1);

		/* select both ports, use r/w perms from RHT */
		lxt[i].rlba_base = ((aun << MC_CHUNK_SHIFT) |
				    (lli->lun_index << LXT_LUNIDX_SHIFT) |
				    (RHT_PERM_RW << LXT_PERM_SHIFT |
				     lli->port_sel));
	}

	mutex_unlock(&blka->mutex);

	/*
	 * The following sequence is prescribed in the SISlite spec
	 * for syncing up with the AFU when adding LXT entries.
	 */
	dma_wmb(); /* Make LXT updates are visible */

	rhte->lxt_start = lxt;
	dma_wmb(); /* Make RHT entry's LXT table update visible */

	rhte->lxt_cnt = my_new_size;
	dma_wmb(); /* Make RHT entry's LXT table size update visible */

	cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC);

	/* free old lxt if reallocated */
	if (lxt != lxt_old)
		kfree(lxt_old);
	*new_size = my_new_size;
out:
	pr_debug("%s: returning rc=%d\n", __func__, rc);
	return rc;
}

/**
 * shrink_lxt() - reduces translation table associated with the specified RHTE
 * @afu:	AFU associated with the host.
 * @sdev:	SCSI device associated with LUN.
 * @rhndl:	Resource handle associated with the RHTE.
 * @rhte:	Resource handle entry (RHTE).
 * @ctxi:	Context owning resources.
 * @new_size:	Number of translation entries associated with RHTE.
 *
 * Return: 0 on success, -errno on failure
 */
static int shrink_lxt(struct afu *afu,
		      struct scsi_device *sdev,
		      res_hndl_t rhndl,
		      struct sisl_rht_entry *rhte,
		      struct ctx_info *ctxi,
		      u64 *new_size)
{
	struct sisl_lxt_entry *lxt, *lxt_old;
	struct llun_info *lli = sdev->hostdata;
	struct glun_info *gli = lli->parent;
	struct blka *blka = &gli->blka;
	ctx_hndl_t ctxid = DECODE_CTXID(ctxi->ctxid);
	bool needs_ws = ctxi->rht_needs_ws[rhndl];
	bool needs_sync = !ctxi->err_recovery_active;
	u32 ngrps, ngrps_old;
	u64 aun;		/* chunk# allocated by block allocator */
	u64 delta = rhte->lxt_cnt - *new_size;
	u64 my_new_size;
	int i, rc = 0;

	lxt_old = rhte->lxt_start;
	ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt);
	ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt - delta);

	if (ngrps != ngrps_old) {
		/* Reallocate to fit new size unless new size is 0 */
		if (ngrps) {
			lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps),
				      GFP_KERNEL);
			if (unlikely(!lxt)) {
				rc = -ENOMEM;
				goto out;
			}

			/* Copy over old entries that will remain */
			memcpy(lxt, lxt_old,
			       (sizeof(*lxt) * (rhte->lxt_cnt - delta)));
		} else
			lxt = NULL;
	} else
		lxt = lxt_old;

	/* Nothing can fail from now on */
	my_new_size = rhte->lxt_cnt - delta;

	/*
	 * The following sequence is prescribed in the SISlite spec
	 * for syncing up with the AFU when removing LXT entries.
	 */
	rhte->lxt_cnt = my_new_size;
	dma_wmb(); /* Make RHT entry's LXT table size update visible */

	rhte->lxt_start = lxt;
	dma_wmb(); /* Make RHT entry's LXT table update visible */

	if (needs_sync)
		cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC);

	if (needs_ws) {
		/*
		 * Mark the context as unavailable, so that we can release
		 * the mutex safely.
		 */
		ctxi->unavail = true;
		mutex_unlock(&ctxi->mutex);
	}

	/* Free LBAs allocated to freed chunks */
	mutex_lock(&blka->mutex);
	for (i = delta - 1; i >= 0; i--) {
		/* Mask the higher 48 bits before shifting, even though
		 * it is a noop
		 */
		aun = (lxt_old[my_new_size + i].rlba_base & SISL_ASTATUS_MASK);
		aun = (aun >> MC_CHUNK_SHIFT);
		if (needs_ws)
			write_same16(sdev, aun, MC_CHUNK_SIZE);
		ba_free(&blka->ba_lun, aun);
	}
	mutex_unlock(&blka->mutex);

	if (needs_ws) {
		/* Make the context visible again */
		mutex_lock(&ctxi->mutex);
		ctxi->unavail = false;
	}

	/* Free old lxt if reallocated */
	if (lxt != lxt_old)
		kfree(lxt_old);
	*new_size = my_new_size;
out:
	pr_debug("%s: returning rc=%d\n", __func__, rc);
	return rc;
}

/**
 * _cxlflash_vlun_resize() - changes the size of a virtual lun
 * @sdev:	SCSI device associated with LUN owning virtual LUN.
 * @ctxi:	Context owning resources.
 * @resize:	Resize ioctl data structure.
 *
 * On successful return, the user is informed of the new size (in blocks)
 * of the virtual lun in last LBA format. When the size of the virtual
 * lun is zero, the last LBA is reflected as -1. See comment in the
 * prologue for _cxlflash_disk_release() regarding AFU syncs and contexts
 * on the error recovery list.
 *
 * Return: 0 on success, -errno on failure
 */
int _cxlflash_vlun_resize(struct scsi_device *sdev,
			  struct ctx_info *ctxi,
			  struct dk_cxlflash_resize *resize)
{
	struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
	struct llun_info *lli = sdev->hostdata;
	struct glun_info *gli = lli->parent;
	struct afu *afu = cfg->afu;
	bool put_ctx = false;

	res_hndl_t rhndl = resize->rsrc_handle;
	u64 new_size;
	u64 nsectors;
	u64 ctxid = DECODE_CTXID(resize->context_id),
	    rctxid = resize->context_id;

	struct sisl_rht_entry *rhte;

	int rc = 0;

	/*
	 * The requested size (req_size) is always assumed to be in 4k blocks,
	 * so we have to convert it here from 4k to chunk size.
	 */
	nsectors = (resize->req_size * CXLFLASH_BLOCK_SIZE) / gli->blk_len;
	new_size = DIV_ROUND_UP(nsectors, MC_CHUNK_SIZE);

	pr_debug("%s: ctxid=%llu rhndl=0x%llx, req_size=0x%llx,"
		 "new_size=%llx\n", __func__, ctxid, resize->rsrc_handle,
		 resize->req_size, new_size);

	if (unlikely(gli->mode != MODE_VIRTUAL)) {
		pr_debug("%s: LUN mode does not support resize! (%d)\n",
			 __func__, gli->mode);
		rc = -EINVAL;
		goto out;

	}

	if (!ctxi) {
		ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK);
		if (unlikely(!ctxi)) {
			pr_debug("%s: Bad context! (%llu)\n", __func__, ctxid);
			rc = -EINVAL;
			goto out;
		}

		put_ctx = true;
	}

	rhte = get_rhte(ctxi, rhndl, lli);
	if (unlikely(!rhte)) {
		pr_debug("%s: Bad resource handle! (%u)\n", __func__, rhndl);
		rc = -EINVAL;
		goto out;
	}

	if (new_size > rhte->lxt_cnt)
		rc = grow_lxt(afu, sdev, ctxid, rhndl, rhte, &new_size);
	else if (new_size < rhte->lxt_cnt)
		rc = shrink_lxt(afu, sdev, rhndl, rhte, ctxi, &new_size);

	resize->hdr.return_flags = 0;
	resize->last_lba = (new_size * MC_CHUNK_SIZE * gli->blk_len);
	resize->last_lba /= CXLFLASH_BLOCK_SIZE;
	resize->last_lba--;

out:
	if (put_ctx)
		put_context(ctxi);
	pr_debug("%s: resized to %lld returning rc=%d\n",
		 __func__, resize->last_lba, rc);
	return rc;
}

int cxlflash_vlun_resize(struct scsi_device *sdev,
			 struct dk_cxlflash_resize *resize)
{
	return _cxlflash_vlun_resize(sdev, NULL, resize);
}

/**
 * cxlflash_restore_luntable() - Restore LUN table to prior state
 * @cfg:	Internal structure associated with the host.
 */
void cxlflash_restore_luntable(struct cxlflash_cfg *cfg)
{
	struct llun_info *lli, *temp;
	u32 chan;
	u32 lind;
	struct afu *afu = cfg->afu;
	struct sisl_global_map *agm = &afu->afu_map->global;

	mutex_lock(&global.mutex);

	list_for_each_entry_safe(lli, temp, &cfg->lluns, list) {
		if (!lli->in_table)
			continue;

		lind = lli->lun_index;

		if (lli->port_sel == BOTH_PORTS) {
			writeq_be(lli->lun_id[0], &agm->fc_port[0][lind]);
			writeq_be(lli->lun_id[1], &agm->fc_port[1][lind]);
			pr_debug("%s: Virtual LUN on slot %d  id0=%llx, "
				 "id1=%llx\n", __func__, lind,
				 lli->lun_id[0], lli->lun_id[1]);
		} else {
			chan = PORT2CHAN(lli->port_sel);
			writeq_be(lli->lun_id[chan], &agm->fc_port[chan][lind]);
			pr_debug("%s: Virtual LUN on slot %d chan=%d, "
				 "id=%llx\n", __func__, lind, chan,
				 lli->lun_id[chan]);
		}
	}

	mutex_unlock(&global.mutex);
}

/**
 * init_luntable() - write an entry in the LUN table
 * @cfg:	Internal structure associated with the host.
 * @lli:	Per adapter LUN information structure.
 *
 * On successful return, a LUN table entry is created.
 * At the top for LUNs visible on both ports.
 * At the bottom for LUNs visible only on one port.
 *
 * Return: 0 on success, -errno on failure
 */
static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli)
{
	u32 chan;
	u32 lind;
	int rc = 0;
	struct afu *afu = cfg->afu;
	struct sisl_global_map *agm = &afu->afu_map->global;

	mutex_lock(&global.mutex);

	if (lli->in_table)
		goto out;

	if (lli->port_sel == BOTH_PORTS) {
		/*
		 * If this LUN is visible from both ports, we will put
		 * it in the top half of the LUN table.
		 */
		if ((cfg->promote_lun_index == cfg->last_lun_index[0]) ||
		    (cfg->promote_lun_index == cfg->last_lun_index[1])) {
			rc = -ENOSPC;
			goto out;
		}

		lind = lli->lun_index = cfg->promote_lun_index;
		writeq_be(lli->lun_id[0], &agm->fc_port[0][lind]);
		writeq_be(lli->lun_id[1], &agm->fc_port[1][lind]);
		cfg->promote_lun_index++;
		pr_debug("%s: Virtual LUN on slot %d  id0=%llx, id1=%llx\n",
			 __func__, lind, lli->lun_id[0], lli->lun_id[1]);
	} else {
		/*
		 * If this LUN is visible only from one port, we will put
		 * it in the bottom half of the LUN table.
		 */
		chan = PORT2CHAN(lli->port_sel);
		if (cfg->promote_lun_index == cfg->last_lun_index[chan]) {
			rc = -ENOSPC;
			goto out;
		}

		lind = lli->lun_index = cfg->last_lun_index[chan];
		writeq_be(lli->lun_id[chan], &agm->fc_port[chan][lind]);
		cfg->last_lun_index[chan]--;
		pr_debug("%s: Virtual LUN on slot %d  chan=%d, id=%llx\n",
			 __func__, lind, chan, lli->lun_id[chan]);
	}

	lli->in_table = true;
out:
	mutex_unlock(&global.mutex);
	pr_debug("%s: returning rc=%d\n", __func__, rc);
	return rc;
}

/**
 * cxlflash_disk_virtual_open() - open a virtual disk of specified size
 * @sdev:	SCSI device associated with LUN owning virtual LUN.
 * @arg:	UVirtual ioctl data structure.
 *
 * On successful return, the user is informed of the resource handle
 * to be used to identify the virtual lun and the size (in blocks) of
 * the virtual lun in last LBA format. When the size of the virtual lun
 * is zero, the last LBA is reflected as -1.
 *
 * Return: 0 on success, -errno on failure
 */
int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg)
{
	struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
	struct device *dev = &cfg->dev->dev;
	struct llun_info *lli = sdev->hostdata;
	struct glun_info *gli = lli->parent;

	struct dk_cxlflash_uvirtual *virt = (struct dk_cxlflash_uvirtual *)arg;
	struct dk_cxlflash_resize resize;

	u64 ctxid = DECODE_CTXID(virt->context_id),
	    rctxid = virt->context_id;
	u64 lun_size = virt->lun_size;
	u64 last_lba = 0;
	u64 rsrc_handle = -1;

	int rc = 0;

	struct ctx_info *ctxi = NULL;
	struct sisl_rht_entry *rhte = NULL;

	pr_debug("%s: ctxid=%llu ls=0x%llx\n", __func__, ctxid, lun_size);

	mutex_lock(&gli->mutex);
	if (gli->mode == MODE_NONE) {
		/* Setup the LUN table and block allocator on first call */
		rc = init_luntable(cfg, lli);
		if (rc) {
			dev_err(dev, "%s: call to init_luntable failed "
				"rc=%d!\n", __func__, rc);
			goto err0;
		}

		rc = init_vlun(lli);
		if (rc) {
			dev_err(dev, "%s: call to init_vlun failed rc=%d!\n",
				__func__, rc);
			rc = -ENOMEM;
			goto err0;
		}
	}

	rc = cxlflash_lun_attach(gli, MODE_VIRTUAL, true);
	if (unlikely(rc)) {
		dev_err(dev, "%s: Failed to attach to LUN! (VIRTUAL)\n",
			__func__);
		goto err0;
	}
	mutex_unlock(&gli->mutex);

	ctxi = get_context(cfg, rctxid, lli, 0);
	if (unlikely(!ctxi)) {
		dev_err(dev, "%s: Bad context! (%llu)\n", __func__, ctxid);
		rc = -EINVAL;
		goto err1;
	}

	rhte = rhte_checkout(ctxi, lli);
	if (unlikely(!rhte)) {
		dev_err(dev, "%s: too many opens for this context\n", __func__);
		rc = -EMFILE;	/* too many opens  */
		goto err1;
	}

	rsrc_handle = (rhte - ctxi->rht_start);

	/* Populate RHT format 0 */
	rhte->nmask = MC_RHT_NMASK;
	rhte->fp = SISL_RHT_FP(0U, ctxi->rht_perms);

	/* Resize even if requested size is 0 */
	marshal_virt_to_resize(virt, &resize);
	resize.rsrc_handle = rsrc_handle;
	rc = _cxlflash_vlun_resize(sdev, ctxi, &resize);
	if (rc) {
		dev_err(dev, "%s: resize failed rc %d\n", __func__, rc);
		goto err2;
	}
	last_lba = resize.last_lba;

	if (virt->hdr.flags & DK_CXLFLASH_UVIRTUAL_NEED_WRITE_SAME)
		ctxi->rht_needs_ws[rsrc_handle] = true;

	virt->hdr.return_flags = 0;
	virt->last_lba = last_lba;
	virt->rsrc_handle = rsrc_handle;

out:
	if (likely(ctxi))
		put_context(ctxi);
	pr_debug("%s: returning handle 0x%llx rc=%d llba %lld\n",
		 __func__, rsrc_handle, rc, last_lba);
	return rc;

err2:
	rhte_checkin(ctxi, rhte);
err1:
	cxlflash_lun_detach(gli);
	goto out;
err0:
	/* Special common cleanup prior to successful LUN attach */
	cxlflash_ba_terminate(&gli->blka.ba_lun);
	mutex_unlock(&gli->mutex);
	goto out;
}

/**
 * clone_lxt() - copies translation tables from source to destination RHTE
 * @afu:	AFU associated with the host.
 * @blka:	Block allocator associated with LUN.
 * @ctxid:	Context ID of context owning the RHTE.
 * @rhndl:	Resource handle associated with the RHTE.
 * @rhte:	Destination resource handle entry (RHTE).
 * @rhte_src:	Source resource handle entry (RHTE).
 *
 * Return: 0 on success, -errno on failure
 */
static int clone_lxt(struct afu *afu,
		     struct blka *blka,
		     ctx_hndl_t ctxid,
		     res_hndl_t rhndl,
		     struct sisl_rht_entry *rhte,
		     struct sisl_rht_entry *rhte_src)
{
	struct sisl_lxt_entry *lxt;
	u32 ngrps;
	u64 aun;		/* chunk# allocated by block allocator */
	int i, j;

	ngrps = LXT_NUM_GROUPS(rhte_src->lxt_cnt);

	if (ngrps) {
		/* allocate new LXTs for clone */
		lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps),
				GFP_KERNEL);
		if (unlikely(!lxt))
			return -ENOMEM;

		/* copy over */
		memcpy(lxt, rhte_src->lxt_start,
		       (sizeof(*lxt) * rhte_src->lxt_cnt));

		/* clone the LBAs in block allocator via ref_cnt */
		mutex_lock(&blka->mutex);
		for (i = 0; i < rhte_src->lxt_cnt; i++) {
			aun = (lxt[i].rlba_base >> MC_CHUNK_SHIFT);
			if (ba_clone(&blka->ba_lun, aun) == -1ULL) {
				/* free the clones already made */
				for (j = 0; j < i; j++) {
					aun = (lxt[j].rlba_base >>
					       MC_CHUNK_SHIFT);
					ba_free(&blka->ba_lun, aun);
				}

				mutex_unlock(&blka->mutex);
				kfree(lxt);
				return -EIO;
			}
		}
		mutex_unlock(&blka->mutex);
	} else {
		lxt = NULL;
	}

	/*
	 * The following sequence is prescribed in the SISlite spec
	 * for syncing up with the AFU when adding LXT entries.
	 */
	dma_wmb(); /* Make LXT updates are visible */

	rhte->lxt_start = lxt;
	dma_wmb(); /* Make RHT entry's LXT table update visible */

	rhte->lxt_cnt = rhte_src->lxt_cnt;
	dma_wmb(); /* Make RHT entry's LXT table size update visible */

	cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC);

	pr_debug("%s: returning\n", __func__);
	return 0;
}

/**
 * cxlflash_disk_clone() - clone a context by making snapshot of another
 * @sdev:	SCSI device associated with LUN owning virtual LUN.
 * @clone:	Clone ioctl data structure.
 *
 * This routine effectively performs cxlflash_disk_open operation for each
 * in-use virtual resource in the source context. Note that the destination
 * context must be in pristine state and cannot have any resource handles
 * open at the time of the clone.
 *
 * Return: 0 on success, -errno on failure
 */
int cxlflash_disk_clone(struct scsi_device *sdev,
			struct dk_cxlflash_clone *clone)
{
	struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
	struct llun_info *lli = sdev->hostdata;
	struct glun_info *gli = lli->parent;
	struct blka *blka = &gli->blka;
	struct afu *afu = cfg->afu;
	struct dk_cxlflash_release release = { { 0 }, 0 };

	struct ctx_info *ctxi_src = NULL,
			*ctxi_dst = NULL;
	struct lun_access *lun_access_src, *lun_access_dst;
	u32 perms;
	u64 ctxid_src = DECODE_CTXID(clone->context_id_src),
	    ctxid_dst = DECODE_CTXID(clone->context_id_dst),
	    rctxid_src = clone->context_id_src,
	    rctxid_dst = clone->context_id_dst;
	int adap_fd_src = clone->adap_fd_src;
	int i, j;
	int rc = 0;
	bool found;
	LIST_HEAD(sidecar);

	pr_debug("%s: ctxid_src=%llu ctxid_dst=%llu adap_fd_src=%d\n",
		 __func__, ctxid_src, ctxid_dst, adap_fd_src);

	/* Do not clone yourself */
	if (unlikely(rctxid_src == rctxid_dst)) {
		rc = -EINVAL;
		goto out;
	}

	if (unlikely(gli->mode != MODE_VIRTUAL)) {
		rc = -EINVAL;
		pr_debug("%s: Clone not supported on physical LUNs! (%d)\n",
			 __func__, gli->mode);
		goto out;
	}

	ctxi_src = get_context(cfg, rctxid_src, lli, CTX_CTRL_CLONE);
	ctxi_dst = get_context(cfg, rctxid_dst, lli, 0);
	if (unlikely(!ctxi_src || !ctxi_dst)) {
		pr_debug("%s: Bad context! (%llu,%llu)\n", __func__,
			 ctxid_src, ctxid_dst);
		rc = -EINVAL;
		goto out;
	}

	if (unlikely(adap_fd_src != ctxi_src->lfd)) {
		pr_debug("%s: Invalid source adapter fd! (%d)\n",
			 __func__, adap_fd_src);
		rc = -EINVAL;
		goto out;
	}

	/* Verify there is no open resource handle in the destination context */
	for (i = 0; i < MAX_RHT_PER_CONTEXT; i++)
		if (ctxi_dst->rht_start[i].nmask != 0) {
			rc = -EINVAL;
			goto out;
		}

	/* Clone LUN access list */
	list_for_each_entry(lun_access_src, &ctxi_src->luns, list) {
		found = false;
		list_for_each_entry(lun_access_dst, &ctxi_dst->luns, list)
			if (lun_access_dst->sdev == lun_access_src->sdev) {
				found = true;
				break;
			}

		if (!found) {
			lun_access_dst = kzalloc(sizeof(*lun_access_dst),
						 GFP_KERNEL);
			if (unlikely(!lun_access_dst)) {
				pr_err("%s: Unable to allocate lun_access!\n",
				       __func__);
				rc = -ENOMEM;
				goto out;
			}

			*lun_access_dst = *lun_access_src;
			list_add(&lun_access_dst->list, &sidecar);
		}
	}

	if (unlikely(!ctxi_src->rht_out)) {
		pr_debug("%s: Nothing to clone!\n", __func__);
		goto out_success;
	}

	/* User specified permission on attach */
	perms = ctxi_dst->rht_perms;

	/*
	 * Copy over checked-out RHT (and their associated LXT) entries by
	 * hand, stopping after we've copied all outstanding entries and
	 * cleaning up if the clone fails.
	 *
	 * Note: This loop is equivalent to performing cxlflash_disk_open and
	 * cxlflash_vlun_resize. As such, LUN accounting needs to be taken into
	 * account by attaching after each successful RHT entry clone. In the
	 * event that a clone failure is experienced, the LUN detach is handled
	 * via the cleanup performed by _cxlflash_disk_release.
	 */
	for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) {
		if (ctxi_src->rht_out == ctxi_dst->rht_out)
			break;
		if (ctxi_src->rht_start[i].nmask == 0)
			continue;

		/* Consume a destination RHT entry */
		ctxi_dst->rht_out++;
		ctxi_dst->rht_start[i].nmask = ctxi_src->rht_start[i].nmask;
		ctxi_dst->rht_start[i].fp =
		    SISL_RHT_FP_CLONE(ctxi_src->rht_start[i].fp, perms);
		ctxi_dst->rht_lun[i] = ctxi_src->rht_lun[i];

		rc = clone_lxt(afu, blka, ctxid_dst, i,
			       &ctxi_dst->rht_start[i],
			       &ctxi_src->rht_start[i]);
		if (rc) {
			marshal_clone_to_rele(clone, &release);
			for (j = 0; j < i; j++) {
				release.rsrc_handle = j;
				_cxlflash_disk_release(sdev, ctxi_dst,
						       &release);
			}

			/* Put back the one we failed on */
			rhte_checkin(ctxi_dst, &ctxi_dst->rht_start[i]);
			goto err;
		}

		cxlflash_lun_attach(gli, gli->mode, false);
	}

out_success:
	list_splice(&sidecar, &ctxi_dst->luns);
	sys_close(adap_fd_src);

	/* fall through */
out:
	if (ctxi_src)
		put_context(ctxi_src);
	if (ctxi_dst)
		put_context(ctxi_dst);
	pr_debug("%s: returning rc=%d\n", __func__, rc);
	return rc;

err:
	list_for_each_entry_safe(lun_access_src, lun_access_dst, &sidecar, list)
		kfree(lun_access_src);
	goto out;
}