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2cb79266 MO |
1 | /* |
2 | * CXL Flash Device Driver | |
3 | * | |
4 | * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation | |
5 | * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation | |
6 | * | |
7 | * Copyright (C) 2015 IBM Corporation | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/syscalls.h> | |
16 | #include <misc/cxl.h> | |
17 | #include <asm/unaligned.h> | |
18 | #include <asm/bitsperlong.h> | |
19 | ||
20 | #include <scsi/scsi_cmnd.h> | |
21 | #include <scsi/scsi_host.h> | |
22 | #include <uapi/scsi/cxlflash_ioctl.h> | |
23 | ||
24 | #include "sislite.h" | |
25 | #include "common.h" | |
26 | #include "vlun.h" | |
27 | #include "superpipe.h" | |
28 | ||
29 | /** | |
30 | * marshal_virt_to_resize() - translate uvirtual to resize structure | |
31 | * @virt: Source structure from which to translate/copy. | |
32 | * @resize: Destination structure for the translate/copy. | |
33 | */ | |
34 | static void marshal_virt_to_resize(struct dk_cxlflash_uvirtual *virt, | |
35 | struct dk_cxlflash_resize *resize) | |
36 | { | |
37 | resize->hdr = virt->hdr; | |
38 | resize->context_id = virt->context_id; | |
39 | resize->rsrc_handle = virt->rsrc_handle; | |
40 | resize->req_size = virt->lun_size; | |
41 | resize->last_lba = virt->last_lba; | |
42 | } | |
43 | ||
44 | /** | |
45 | * marshal_clone_to_rele() - translate clone to release structure | |
46 | * @clone: Source structure from which to translate/copy. | |
47 | * @rele: Destination structure for the translate/copy. | |
48 | */ | |
49 | static void marshal_clone_to_rele(struct dk_cxlflash_clone *clone, | |
50 | struct dk_cxlflash_release *release) | |
51 | { | |
52 | release->hdr = clone->hdr; | |
53 | release->context_id = clone->context_id_dst; | |
54 | } | |
55 | ||
56 | /** | |
57 | * ba_init() - initializes a block allocator | |
58 | * @ba_lun: Block allocator to initialize. | |
59 | * | |
60 | * Return: 0 on success, -errno on failure | |
61 | */ | |
62 | static int ba_init(struct ba_lun *ba_lun) | |
63 | { | |
64 | struct ba_lun_info *bali = NULL; | |
65 | int lun_size_au = 0, i = 0; | |
66 | int last_word_underflow = 0; | |
67 | u64 *lam; | |
68 | ||
69 | pr_debug("%s: Initializing LUN: lun_id = %llX, " | |
70 | "ba_lun->lsize = %lX, ba_lun->au_size = %lX\n", | |
71 | __func__, ba_lun->lun_id, ba_lun->lsize, ba_lun->au_size); | |
72 | ||
73 | /* Calculate bit map size */ | |
74 | lun_size_au = ba_lun->lsize / ba_lun->au_size; | |
75 | if (lun_size_au == 0) { | |
76 | pr_debug("%s: Requested LUN size of 0!\n", __func__); | |
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | /* Allocate lun information container */ | |
81 | bali = kzalloc(sizeof(struct ba_lun_info), GFP_KERNEL); | |
82 | if (unlikely(!bali)) { | |
83 | pr_err("%s: Failed to allocate lun_info for lun_id %llX\n", | |
84 | __func__, ba_lun->lun_id); | |
85 | return -ENOMEM; | |
86 | } | |
87 | ||
88 | bali->total_aus = lun_size_au; | |
89 | bali->lun_bmap_size = lun_size_au / BITS_PER_LONG; | |
90 | ||
91 | if (lun_size_au % BITS_PER_LONG) | |
92 | bali->lun_bmap_size++; | |
93 | ||
94 | /* Allocate bitmap space */ | |
95 | bali->lun_alloc_map = kzalloc((bali->lun_bmap_size * sizeof(u64)), | |
96 | GFP_KERNEL); | |
97 | if (unlikely(!bali->lun_alloc_map)) { | |
98 | pr_err("%s: Failed to allocate lun allocation map: " | |
99 | "lun_id = %llX\n", __func__, ba_lun->lun_id); | |
100 | kfree(bali); | |
101 | return -ENOMEM; | |
102 | } | |
103 | ||
104 | /* Initialize the bit map size and set all bits to '1' */ | |
105 | bali->free_aun_cnt = lun_size_au; | |
106 | ||
107 | for (i = 0; i < bali->lun_bmap_size; i++) | |
108 | bali->lun_alloc_map[i] = 0xFFFFFFFFFFFFFFFFULL; | |
109 | ||
110 | /* If the last word not fully utilized, mark extra bits as allocated */ | |
111 | last_word_underflow = (bali->lun_bmap_size * BITS_PER_LONG); | |
112 | last_word_underflow -= bali->free_aun_cnt; | |
113 | if (last_word_underflow > 0) { | |
114 | lam = &bali->lun_alloc_map[bali->lun_bmap_size - 1]; | |
115 | for (i = (HIBIT - last_word_underflow + 1); | |
116 | i < BITS_PER_LONG; | |
117 | i++) | |
118 | clear_bit(i, (ulong *)lam); | |
119 | } | |
120 | ||
121 | /* Initialize high elevator index, low/curr already at 0 from kzalloc */ | |
122 | bali->free_high_idx = bali->lun_bmap_size; | |
123 | ||
124 | /* Allocate clone map */ | |
125 | bali->aun_clone_map = kzalloc((bali->total_aus * sizeof(u8)), | |
126 | GFP_KERNEL); | |
127 | if (unlikely(!bali->aun_clone_map)) { | |
128 | pr_err("%s: Failed to allocate clone map: lun_id = %llX\n", | |
129 | __func__, ba_lun->lun_id); | |
130 | kfree(bali->lun_alloc_map); | |
131 | kfree(bali); | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
135 | /* Pass the allocated lun info as a handle to the user */ | |
136 | ba_lun->ba_lun_handle = bali; | |
137 | ||
138 | pr_debug("%s: Successfully initialized the LUN: " | |
139 | "lun_id = %llX, bitmap size = %X, free_aun_cnt = %llX\n", | |
140 | __func__, ba_lun->lun_id, bali->lun_bmap_size, | |
141 | bali->free_aun_cnt); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | /** | |
146 | * find_free_range() - locates a free bit within the block allocator | |
147 | * @low: First word in block allocator to start search. | |
148 | * @high: Last word in block allocator to search. | |
149 | * @bali: LUN information structure owning the block allocator to search. | |
150 | * @bit_word: Passes back the word in the block allocator owning the free bit. | |
151 | * | |
152 | * Return: The bit position within the passed back word, -1 on failure | |
153 | */ | |
154 | static int find_free_range(u32 low, | |
155 | u32 high, | |
156 | struct ba_lun_info *bali, int *bit_word) | |
157 | { | |
158 | int i; | |
159 | u64 bit_pos = -1; | |
160 | ulong *lam, num_bits; | |
161 | ||
162 | for (i = low; i < high; i++) | |
163 | if (bali->lun_alloc_map[i] != 0) { | |
164 | lam = (ulong *)&bali->lun_alloc_map[i]; | |
165 | num_bits = (sizeof(*lam) * BITS_PER_BYTE); | |
166 | bit_pos = find_first_bit(lam, num_bits); | |
167 | ||
168 | pr_devel("%s: Found free bit %llX in lun " | |
169 | "map entry %llX at bitmap index = %X\n", | |
170 | __func__, bit_pos, bali->lun_alloc_map[i], | |
171 | i); | |
172 | ||
173 | *bit_word = i; | |
174 | bali->free_aun_cnt--; | |
175 | clear_bit(bit_pos, lam); | |
176 | break; | |
177 | } | |
178 | ||
179 | return bit_pos; | |
180 | } | |
181 | ||
182 | /** | |
183 | * ba_alloc() - allocates a block from the block allocator | |
184 | * @ba_lun: Block allocator from which to allocate a block. | |
185 | * | |
186 | * Return: The allocated block, -1 on failure | |
187 | */ | |
188 | static u64 ba_alloc(struct ba_lun *ba_lun) | |
189 | { | |
190 | u64 bit_pos = -1; | |
191 | int bit_word = 0; | |
192 | struct ba_lun_info *bali = NULL; | |
193 | ||
194 | bali = ba_lun->ba_lun_handle; | |
195 | ||
196 | pr_debug("%s: Received block allocation request: " | |
197 | "lun_id = %llX, free_aun_cnt = %llX\n", | |
198 | __func__, ba_lun->lun_id, bali->free_aun_cnt); | |
199 | ||
200 | if (bali->free_aun_cnt == 0) { | |
201 | pr_debug("%s: No space left on LUN: lun_id = %llX\n", | |
202 | __func__, ba_lun->lun_id); | |
203 | return -1ULL; | |
204 | } | |
205 | ||
206 | /* Search to find a free entry, curr->high then low->curr */ | |
207 | bit_pos = find_free_range(bali->free_curr_idx, | |
208 | bali->free_high_idx, bali, &bit_word); | |
209 | if (bit_pos == -1) { | |
210 | bit_pos = find_free_range(bali->free_low_idx, | |
211 | bali->free_curr_idx, | |
212 | bali, &bit_word); | |
213 | if (bit_pos == -1) { | |
214 | pr_debug("%s: Could not find an allocation unit on LUN:" | |
215 | " lun_id = %llX\n", __func__, ba_lun->lun_id); | |
216 | return -1ULL; | |
217 | } | |
218 | } | |
219 | ||
220 | /* Update the free_curr_idx */ | |
221 | if (bit_pos == HIBIT) | |
222 | bali->free_curr_idx = bit_word + 1; | |
223 | else | |
224 | bali->free_curr_idx = bit_word; | |
225 | ||
226 | pr_debug("%s: Allocating AU number %llX, on lun_id %llX, " | |
227 | "free_aun_cnt = %llX\n", __func__, | |
228 | ((bit_word * BITS_PER_LONG) + bit_pos), ba_lun->lun_id, | |
229 | bali->free_aun_cnt); | |
230 | ||
231 | return (u64) ((bit_word * BITS_PER_LONG) + bit_pos); | |
232 | } | |
233 | ||
234 | /** | |
235 | * validate_alloc() - validates the specified block has been allocated | |
236 | * @ba_lun_info: LUN info owning the block allocator. | |
237 | * @aun: Block to validate. | |
238 | * | |
239 | * Return: 0 on success, -1 on failure | |
240 | */ | |
241 | static int validate_alloc(struct ba_lun_info *bali, u64 aun) | |
242 | { | |
243 | int idx = 0, bit_pos = 0; | |
244 | ||
245 | idx = aun / BITS_PER_LONG; | |
246 | bit_pos = aun % BITS_PER_LONG; | |
247 | ||
248 | if (test_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx])) | |
249 | return -1; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | /** | |
255 | * ba_free() - frees a block from the block allocator | |
256 | * @ba_lun: Block allocator from which to allocate a block. | |
257 | * @to_free: Block to free. | |
258 | * | |
259 | * Return: 0 on success, -1 on failure | |
260 | */ | |
261 | static int ba_free(struct ba_lun *ba_lun, u64 to_free) | |
262 | { | |
263 | int idx = 0, bit_pos = 0; | |
264 | struct ba_lun_info *bali = NULL; | |
265 | ||
266 | bali = ba_lun->ba_lun_handle; | |
267 | ||
268 | if (validate_alloc(bali, to_free)) { | |
269 | pr_debug("%s: The AUN %llX is not allocated on lun_id %llX\n", | |
270 | __func__, to_free, ba_lun->lun_id); | |
271 | return -1; | |
272 | } | |
273 | ||
274 | pr_debug("%s: Received a request to free AU %llX on lun_id %llX, " | |
275 | "free_aun_cnt = %llX\n", __func__, to_free, ba_lun->lun_id, | |
276 | bali->free_aun_cnt); | |
277 | ||
278 | if (bali->aun_clone_map[to_free] > 0) { | |
279 | pr_debug("%s: AUN %llX on lun_id %llX has been cloned. Clone " | |
280 | "count = %X\n", __func__, to_free, ba_lun->lun_id, | |
281 | bali->aun_clone_map[to_free]); | |
282 | bali->aun_clone_map[to_free]--; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | idx = to_free / BITS_PER_LONG; | |
287 | bit_pos = to_free % BITS_PER_LONG; | |
288 | ||
289 | set_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx]); | |
290 | bali->free_aun_cnt++; | |
291 | ||
292 | if (idx < bali->free_low_idx) | |
293 | bali->free_low_idx = idx; | |
294 | else if (idx > bali->free_high_idx) | |
295 | bali->free_high_idx = idx; | |
296 | ||
297 | pr_debug("%s: Successfully freed AU at bit_pos %X, bit map index %X on " | |
298 | "lun_id %llX, free_aun_cnt = %llX\n", __func__, bit_pos, idx, | |
299 | ba_lun->lun_id, bali->free_aun_cnt); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | /** | |
305 | * ba_clone() - Clone a chunk of the block allocation table | |
306 | * @ba_lun: Block allocator from which to allocate a block. | |
307 | * @to_free: Block to free. | |
308 | * | |
309 | * Return: 0 on success, -1 on failure | |
310 | */ | |
311 | static int ba_clone(struct ba_lun *ba_lun, u64 to_clone) | |
312 | { | |
313 | struct ba_lun_info *bali = ba_lun->ba_lun_handle; | |
314 | ||
315 | if (validate_alloc(bali, to_clone)) { | |
316 | pr_debug("%s: AUN %llX is not allocated on lun_id %llX\n", | |
317 | __func__, to_clone, ba_lun->lun_id); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | pr_debug("%s: Received a request to clone AUN %llX on lun_id %llX\n", | |
322 | __func__, to_clone, ba_lun->lun_id); | |
323 | ||
324 | if (bali->aun_clone_map[to_clone] == MAX_AUN_CLONE_CNT) { | |
325 | pr_debug("%s: AUN %llX on lun_id %llX hit max clones already\n", | |
326 | __func__, to_clone, ba_lun->lun_id); | |
327 | return -1; | |
328 | } | |
329 | ||
330 | bali->aun_clone_map[to_clone]++; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | /** | |
336 | * ba_space() - returns the amount of free space left in the block allocator | |
337 | * @ba_lun: Block allocator. | |
338 | * | |
339 | * Return: Amount of free space in block allocator | |
340 | */ | |
341 | static u64 ba_space(struct ba_lun *ba_lun) | |
342 | { | |
343 | struct ba_lun_info *bali = ba_lun->ba_lun_handle; | |
344 | ||
345 | return bali->free_aun_cnt; | |
346 | } | |
347 | ||
348 | /** | |
349 | * cxlflash_ba_terminate() - frees resources associated with the block allocator | |
350 | * @ba_lun: Block allocator. | |
351 | * | |
352 | * Safe to call in a partially allocated state. | |
353 | */ | |
354 | void cxlflash_ba_terminate(struct ba_lun *ba_lun) | |
355 | { | |
356 | struct ba_lun_info *bali = ba_lun->ba_lun_handle; | |
357 | ||
358 | if (bali) { | |
359 | kfree(bali->aun_clone_map); | |
360 | kfree(bali->lun_alloc_map); | |
361 | kfree(bali); | |
362 | ba_lun->ba_lun_handle = NULL; | |
363 | } | |
364 | } | |
365 | ||
366 | /** | |
367 | * init_vlun() - initializes a LUN for virtual use | |
368 | * @lun_info: LUN information structure that owns the block allocator. | |
369 | * | |
370 | * Return: 0 on success, -errno on failure | |
371 | */ | |
372 | static int init_vlun(struct llun_info *lli) | |
373 | { | |
374 | int rc = 0; | |
375 | struct glun_info *gli = lli->parent; | |
376 | struct blka *blka = &gli->blka; | |
377 | ||
378 | memset(blka, 0, sizeof(*blka)); | |
379 | mutex_init(&blka->mutex); | |
380 | ||
381 | /* LUN IDs are unique per port, save the index instead */ | |
382 | blka->ba_lun.lun_id = lli->lun_index; | |
383 | blka->ba_lun.lsize = gli->max_lba + 1; | |
384 | blka->ba_lun.lba_size = gli->blk_len; | |
385 | ||
386 | blka->ba_lun.au_size = MC_CHUNK_SIZE; | |
387 | blka->nchunk = blka->ba_lun.lsize / MC_CHUNK_SIZE; | |
388 | ||
389 | rc = ba_init(&blka->ba_lun); | |
390 | if (unlikely(rc)) | |
391 | pr_debug("%s: cannot init block_alloc, rc=%d\n", __func__, rc); | |
392 | ||
393 | pr_debug("%s: returning rc=%d lli=%p\n", __func__, rc, lli); | |
394 | return rc; | |
395 | } | |
396 | ||
397 | /** | |
398 | * write_same16() - sends a SCSI WRITE_SAME16 (0) command to specified LUN | |
399 | * @sdev: SCSI device associated with LUN. | |
400 | * @lba: Logical block address to start write same. | |
401 | * @nblks: Number of logical blocks to write same. | |
402 | * | |
403 | * Return: 0 on success, -errno on failure | |
404 | */ | |
405 | static int write_same16(struct scsi_device *sdev, | |
406 | u64 lba, | |
407 | u32 nblks) | |
408 | { | |
409 | u8 *cmd_buf = NULL; | |
410 | u8 *scsi_cmd = NULL; | |
411 | u8 *sense_buf = NULL; | |
412 | int rc = 0; | |
413 | int result = 0; | |
414 | int ws_limit = SISLITE_MAX_WS_BLOCKS; | |
415 | u64 offset = lba; | |
416 | int left = nblks; | |
417 | u32 tout = sdev->request_queue->rq_timeout; | |
418 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
419 | struct device *dev = &cfg->dev->dev; | |
420 | ||
421 | cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL); | |
422 | scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL); | |
423 | sense_buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL); | |
424 | if (unlikely(!cmd_buf || !scsi_cmd || !sense_buf)) { | |
425 | rc = -ENOMEM; | |
426 | goto out; | |
427 | } | |
428 | ||
429 | while (left > 0) { | |
430 | ||
431 | scsi_cmd[0] = WRITE_SAME_16; | |
432 | put_unaligned_be64(offset, &scsi_cmd[2]); | |
433 | put_unaligned_be32(ws_limit < left ? ws_limit : left, | |
434 | &scsi_cmd[10]); | |
435 | ||
436 | result = scsi_execute(sdev, scsi_cmd, DMA_TO_DEVICE, cmd_buf, | |
437 | CMD_BUFSIZE, sense_buf, tout, 5, 0, NULL); | |
438 | if (result) { | |
439 | dev_err_ratelimited(dev, "%s: command failed for " | |
440 | "offset %lld result=0x%x\n", | |
441 | __func__, offset, result); | |
442 | rc = -EIO; | |
443 | goto out; | |
444 | } | |
445 | left -= ws_limit; | |
446 | offset += ws_limit; | |
447 | } | |
448 | ||
449 | out: | |
450 | kfree(cmd_buf); | |
451 | kfree(scsi_cmd); | |
452 | kfree(sense_buf); | |
453 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
454 | return rc; | |
455 | } | |
456 | ||
457 | /** | |
458 | * grow_lxt() - expands the translation table associated with the specified RHTE | |
459 | * @afu: AFU associated with the host. | |
460 | * @sdev: SCSI device associated with LUN. | |
461 | * @ctxid: Context ID of context owning the RHTE. | |
462 | * @rhndl: Resource handle associated with the RHTE. | |
463 | * @rhte: Resource handle entry (RHTE). | |
464 | * @new_size: Number of translation entries associated with RHTE. | |
465 | * | |
466 | * By design, this routine employs a 'best attempt' allocation and will | |
467 | * truncate the requested size down if there is not sufficient space in | |
468 | * the block allocator to satisfy the request but there does exist some | |
469 | * amount of space. The user is made aware of this by returning the size | |
470 | * allocated. | |
471 | * | |
472 | * Return: 0 on success, -errno on failure | |
473 | */ | |
474 | static int grow_lxt(struct afu *afu, | |
475 | struct scsi_device *sdev, | |
476 | ctx_hndl_t ctxid, | |
477 | res_hndl_t rhndl, | |
478 | struct sisl_rht_entry *rhte, | |
479 | u64 *new_size) | |
480 | { | |
481 | struct sisl_lxt_entry *lxt = NULL, *lxt_old = NULL; | |
482 | struct llun_info *lli = sdev->hostdata; | |
483 | struct glun_info *gli = lli->parent; | |
484 | struct blka *blka = &gli->blka; | |
485 | u32 av_size; | |
486 | u32 ngrps, ngrps_old; | |
487 | u64 aun; /* chunk# allocated by block allocator */ | |
488 | u64 delta = *new_size - rhte->lxt_cnt; | |
489 | u64 my_new_size; | |
490 | int i, rc = 0; | |
491 | ||
492 | /* | |
493 | * Check what is available in the block allocator before re-allocating | |
494 | * LXT array. This is done up front under the mutex which must not be | |
495 | * released until after allocation is complete. | |
496 | */ | |
497 | mutex_lock(&blka->mutex); | |
498 | av_size = ba_space(&blka->ba_lun); | |
499 | if (unlikely(av_size <= 0)) { | |
500 | pr_debug("%s: ba_space error: av_size %d\n", __func__, av_size); | |
501 | mutex_unlock(&blka->mutex); | |
502 | rc = -ENOSPC; | |
503 | goto out; | |
504 | } | |
505 | ||
506 | if (av_size < delta) | |
507 | delta = av_size; | |
508 | ||
509 | lxt_old = rhte->lxt_start; | |
510 | ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt); | |
511 | ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt + delta); | |
512 | ||
513 | if (ngrps != ngrps_old) { | |
514 | /* reallocate to fit new size */ | |
515 | lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), | |
516 | GFP_KERNEL); | |
517 | if (unlikely(!lxt)) { | |
518 | mutex_unlock(&blka->mutex); | |
519 | rc = -ENOMEM; | |
520 | goto out; | |
521 | } | |
522 | ||
523 | /* copy over all old entries */ | |
524 | memcpy(lxt, lxt_old, (sizeof(*lxt) * rhte->lxt_cnt)); | |
525 | } else | |
526 | lxt = lxt_old; | |
527 | ||
528 | /* nothing can fail from now on */ | |
529 | my_new_size = rhte->lxt_cnt + delta; | |
530 | ||
531 | /* add new entries to the end */ | |
532 | for (i = rhte->lxt_cnt; i < my_new_size; i++) { | |
533 | /* | |
534 | * Due to the earlier check of available space, ba_alloc | |
535 | * cannot fail here. If it did due to internal error, | |
536 | * leave a rlba_base of -1u which will likely be a | |
537 | * invalid LUN (too large). | |
538 | */ | |
539 | aun = ba_alloc(&blka->ba_lun); | |
540 | if ((aun == -1ULL) || (aun >= blka->nchunk)) | |
541 | pr_debug("%s: ba_alloc error: allocated chunk# %llX, " | |
542 | "max %llX\n", __func__, aun, blka->nchunk - 1); | |
543 | ||
544 | /* select both ports, use r/w perms from RHT */ | |
545 | lxt[i].rlba_base = ((aun << MC_CHUNK_SHIFT) | | |
546 | (lli->lun_index << LXT_LUNIDX_SHIFT) | | |
547 | (RHT_PERM_RW << LXT_PERM_SHIFT | | |
548 | lli->port_sel)); | |
549 | } | |
550 | ||
551 | mutex_unlock(&blka->mutex); | |
552 | ||
553 | /* | |
554 | * The following sequence is prescribed in the SISlite spec | |
555 | * for syncing up with the AFU when adding LXT entries. | |
556 | */ | |
557 | dma_wmb(); /* Make LXT updates are visible */ | |
558 | ||
559 | rhte->lxt_start = lxt; | |
560 | dma_wmb(); /* Make RHT entry's LXT table update visible */ | |
561 | ||
562 | rhte->lxt_cnt = my_new_size; | |
563 | dma_wmb(); /* Make RHT entry's LXT table size update visible */ | |
564 | ||
565 | cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC); | |
566 | ||
567 | /* free old lxt if reallocated */ | |
568 | if (lxt != lxt_old) | |
569 | kfree(lxt_old); | |
570 | *new_size = my_new_size; | |
571 | out: | |
572 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
573 | return rc; | |
574 | } | |
575 | ||
576 | /** | |
577 | * shrink_lxt() - reduces translation table associated with the specified RHTE | |
578 | * @afu: AFU associated with the host. | |
579 | * @sdev: SCSI device associated with LUN. | |
580 | * @rhndl: Resource handle associated with the RHTE. | |
581 | * @rhte: Resource handle entry (RHTE). | |
582 | * @ctxi: Context owning resources. | |
583 | * @new_size: Number of translation entries associated with RHTE. | |
584 | * | |
585 | * Return: 0 on success, -errno on failure | |
586 | */ | |
587 | static int shrink_lxt(struct afu *afu, | |
588 | struct scsi_device *sdev, | |
589 | res_hndl_t rhndl, | |
590 | struct sisl_rht_entry *rhte, | |
591 | struct ctx_info *ctxi, | |
592 | u64 *new_size) | |
593 | { | |
594 | struct sisl_lxt_entry *lxt, *lxt_old; | |
595 | struct llun_info *lli = sdev->hostdata; | |
596 | struct glun_info *gli = lli->parent; | |
597 | struct blka *blka = &gli->blka; | |
598 | ctx_hndl_t ctxid = DECODE_CTXID(ctxi->ctxid); | |
599 | bool needs_ws = ctxi->rht_needs_ws[rhndl]; | |
600 | bool needs_sync = !ctxi->err_recovery_active; | |
601 | u32 ngrps, ngrps_old; | |
602 | u64 aun; /* chunk# allocated by block allocator */ | |
603 | u64 delta = rhte->lxt_cnt - *new_size; | |
604 | u64 my_new_size; | |
605 | int i, rc = 0; | |
606 | ||
607 | lxt_old = rhte->lxt_start; | |
608 | ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt); | |
609 | ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt - delta); | |
610 | ||
611 | if (ngrps != ngrps_old) { | |
612 | /* Reallocate to fit new size unless new size is 0 */ | |
613 | if (ngrps) { | |
614 | lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), | |
615 | GFP_KERNEL); | |
616 | if (unlikely(!lxt)) { | |
617 | rc = -ENOMEM; | |
618 | goto out; | |
619 | } | |
620 | ||
621 | /* Copy over old entries that will remain */ | |
622 | memcpy(lxt, lxt_old, | |
623 | (sizeof(*lxt) * (rhte->lxt_cnt - delta))); | |
624 | } else | |
625 | lxt = NULL; | |
626 | } else | |
627 | lxt = lxt_old; | |
628 | ||
629 | /* Nothing can fail from now on */ | |
630 | my_new_size = rhte->lxt_cnt - delta; | |
631 | ||
632 | /* | |
633 | * The following sequence is prescribed in the SISlite spec | |
634 | * for syncing up with the AFU when removing LXT entries. | |
635 | */ | |
636 | rhte->lxt_cnt = my_new_size; | |
637 | dma_wmb(); /* Make RHT entry's LXT table size update visible */ | |
638 | ||
639 | rhte->lxt_start = lxt; | |
640 | dma_wmb(); /* Make RHT entry's LXT table update visible */ | |
641 | ||
642 | if (needs_sync) | |
643 | cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); | |
644 | ||
645 | if (needs_ws) { | |
646 | /* | |
647 | * Mark the context as unavailable, so that we can release | |
648 | * the mutex safely. | |
649 | */ | |
650 | ctxi->unavail = true; | |
651 | mutex_unlock(&ctxi->mutex); | |
652 | } | |
653 | ||
654 | /* Free LBAs allocated to freed chunks */ | |
655 | mutex_lock(&blka->mutex); | |
656 | for (i = delta - 1; i >= 0; i--) { | |
657 | /* Mask the higher 48 bits before shifting, even though | |
658 | * it is a noop | |
659 | */ | |
660 | aun = (lxt_old[my_new_size + i].rlba_base & SISL_ASTATUS_MASK); | |
661 | aun = (aun >> MC_CHUNK_SHIFT); | |
662 | if (needs_ws) | |
663 | write_same16(sdev, aun, MC_CHUNK_SIZE); | |
664 | ba_free(&blka->ba_lun, aun); | |
665 | } | |
666 | mutex_unlock(&blka->mutex); | |
667 | ||
668 | if (needs_ws) { | |
669 | /* Make the context visible again */ | |
670 | mutex_lock(&ctxi->mutex); | |
671 | ctxi->unavail = false; | |
672 | } | |
673 | ||
674 | /* Free old lxt if reallocated */ | |
675 | if (lxt != lxt_old) | |
676 | kfree(lxt_old); | |
677 | *new_size = my_new_size; | |
678 | out: | |
679 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
680 | return rc; | |
681 | } | |
682 | ||
683 | /** | |
684 | * _cxlflash_vlun_resize() - changes the size of a virtual lun | |
685 | * @sdev: SCSI device associated with LUN owning virtual LUN. | |
686 | * @ctxi: Context owning resources. | |
687 | * @resize: Resize ioctl data structure. | |
688 | * | |
689 | * On successful return, the user is informed of the new size (in blocks) | |
690 | * of the virtual lun in last LBA format. When the size of the virtual | |
691 | * lun is zero, the last LBA is reflected as -1. See comment in the | |
692 | * prologue for _cxlflash_disk_release() regarding AFU syncs and contexts | |
693 | * on the error recovery list. | |
694 | * | |
695 | * Return: 0 on success, -errno on failure | |
696 | */ | |
697 | int _cxlflash_vlun_resize(struct scsi_device *sdev, | |
698 | struct ctx_info *ctxi, | |
699 | struct dk_cxlflash_resize *resize) | |
700 | { | |
701 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
702 | struct llun_info *lli = sdev->hostdata; | |
703 | struct glun_info *gli = lli->parent; | |
704 | struct afu *afu = cfg->afu; | |
705 | bool put_ctx = false; | |
706 | ||
707 | res_hndl_t rhndl = resize->rsrc_handle; | |
708 | u64 new_size; | |
709 | u64 nsectors; | |
710 | u64 ctxid = DECODE_CTXID(resize->context_id), | |
711 | rctxid = resize->context_id; | |
712 | ||
713 | struct sisl_rht_entry *rhte; | |
714 | ||
715 | int rc = 0; | |
716 | ||
717 | /* | |
718 | * The requested size (req_size) is always assumed to be in 4k blocks, | |
719 | * so we have to convert it here from 4k to chunk size. | |
720 | */ | |
721 | nsectors = (resize->req_size * CXLFLASH_BLOCK_SIZE) / gli->blk_len; | |
722 | new_size = DIV_ROUND_UP(nsectors, MC_CHUNK_SIZE); | |
723 | ||
724 | pr_debug("%s: ctxid=%llu rhndl=0x%llx, req_size=0x%llx," | |
725 | "new_size=%llx\n", __func__, ctxid, resize->rsrc_handle, | |
726 | resize->req_size, new_size); | |
727 | ||
728 | if (unlikely(gli->mode != MODE_VIRTUAL)) { | |
729 | pr_debug("%s: LUN mode does not support resize! (%d)\n", | |
730 | __func__, gli->mode); | |
731 | rc = -EINVAL; | |
732 | goto out; | |
733 | ||
734 | } | |
735 | ||
736 | if (!ctxi) { | |
737 | ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); | |
738 | if (unlikely(!ctxi)) { | |
739 | pr_debug("%s: Bad context! (%llu)\n", __func__, ctxid); | |
740 | rc = -EINVAL; | |
741 | goto out; | |
742 | } | |
743 | ||
744 | put_ctx = true; | |
745 | } | |
746 | ||
747 | rhte = get_rhte(ctxi, rhndl, lli); | |
748 | if (unlikely(!rhte)) { | |
749 | pr_debug("%s: Bad resource handle! (%u)\n", __func__, rhndl); | |
750 | rc = -EINVAL; | |
751 | goto out; | |
752 | } | |
753 | ||
754 | if (new_size > rhte->lxt_cnt) | |
755 | rc = grow_lxt(afu, sdev, ctxid, rhndl, rhte, &new_size); | |
756 | else if (new_size < rhte->lxt_cnt) | |
757 | rc = shrink_lxt(afu, sdev, rhndl, rhte, ctxi, &new_size); | |
758 | ||
759 | resize->hdr.return_flags = 0; | |
760 | resize->last_lba = (new_size * MC_CHUNK_SIZE * gli->blk_len); | |
761 | resize->last_lba /= CXLFLASH_BLOCK_SIZE; | |
762 | resize->last_lba--; | |
763 | ||
764 | out: | |
765 | if (put_ctx) | |
766 | put_context(ctxi); | |
767 | pr_debug("%s: resized to %lld returning rc=%d\n", | |
768 | __func__, resize->last_lba, rc); | |
769 | return rc; | |
770 | } | |
771 | ||
772 | int cxlflash_vlun_resize(struct scsi_device *sdev, | |
773 | struct dk_cxlflash_resize *resize) | |
774 | { | |
775 | return _cxlflash_vlun_resize(sdev, NULL, resize); | |
776 | } | |
777 | ||
778 | /** | |
779 | * cxlflash_restore_luntable() - Restore LUN table to prior state | |
780 | * @cfg: Internal structure associated with the host. | |
781 | */ | |
782 | void cxlflash_restore_luntable(struct cxlflash_cfg *cfg) | |
783 | { | |
784 | struct llun_info *lli, *temp; | |
785 | u32 chan; | |
786 | u32 lind; | |
787 | struct afu *afu = cfg->afu; | |
788 | struct sisl_global_map *agm = &afu->afu_map->global; | |
789 | ||
790 | mutex_lock(&global.mutex); | |
791 | ||
792 | list_for_each_entry_safe(lli, temp, &cfg->lluns, list) { | |
793 | if (!lli->in_table) | |
794 | continue; | |
795 | ||
796 | lind = lli->lun_index; | |
797 | ||
798 | if (lli->port_sel == BOTH_PORTS) { | |
799 | writeq_be(lli->lun_id[0], &agm->fc_port[0][lind]); | |
800 | writeq_be(lli->lun_id[1], &agm->fc_port[1][lind]); | |
801 | pr_debug("%s: Virtual LUN on slot %d id0=%llx, " | |
802 | "id1=%llx\n", __func__, lind, | |
803 | lli->lun_id[0], lli->lun_id[1]); | |
804 | } else { | |
805 | chan = PORT2CHAN(lli->port_sel); | |
806 | writeq_be(lli->lun_id[chan], &agm->fc_port[chan][lind]); | |
807 | pr_debug("%s: Virtual LUN on slot %d chan=%d, " | |
808 | "id=%llx\n", __func__, lind, chan, | |
809 | lli->lun_id[chan]); | |
810 | } | |
811 | } | |
812 | ||
813 | mutex_unlock(&global.mutex); | |
814 | } | |
815 | ||
816 | /** | |
817 | * init_luntable() - write an entry in the LUN table | |
818 | * @cfg: Internal structure associated with the host. | |
819 | * @lli: Per adapter LUN information structure. | |
820 | * | |
821 | * On successful return, a LUN table entry is created. | |
822 | * At the top for LUNs visible on both ports. | |
823 | * At the bottom for LUNs visible only on one port. | |
824 | * | |
825 | * Return: 0 on success, -errno on failure | |
826 | */ | |
827 | static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli) | |
828 | { | |
829 | u32 chan; | |
830 | u32 lind; | |
831 | int rc = 0; | |
832 | struct afu *afu = cfg->afu; | |
833 | struct sisl_global_map *agm = &afu->afu_map->global; | |
834 | ||
835 | mutex_lock(&global.mutex); | |
836 | ||
837 | if (lli->in_table) | |
838 | goto out; | |
839 | ||
840 | if (lli->port_sel == BOTH_PORTS) { | |
841 | /* | |
842 | * If this LUN is visible from both ports, we will put | |
843 | * it in the top half of the LUN table. | |
844 | */ | |
845 | if ((cfg->promote_lun_index == cfg->last_lun_index[0]) || | |
846 | (cfg->promote_lun_index == cfg->last_lun_index[1])) { | |
847 | rc = -ENOSPC; | |
848 | goto out; | |
849 | } | |
850 | ||
851 | lind = lli->lun_index = cfg->promote_lun_index; | |
852 | writeq_be(lli->lun_id[0], &agm->fc_port[0][lind]); | |
853 | writeq_be(lli->lun_id[1], &agm->fc_port[1][lind]); | |
854 | cfg->promote_lun_index++; | |
855 | pr_debug("%s: Virtual LUN on slot %d id0=%llx, id1=%llx\n", | |
856 | __func__, lind, lli->lun_id[0], lli->lun_id[1]); | |
857 | } else { | |
858 | /* | |
859 | * If this LUN is visible only from one port, we will put | |
860 | * it in the bottom half of the LUN table. | |
861 | */ | |
862 | chan = PORT2CHAN(lli->port_sel); | |
863 | if (cfg->promote_lun_index == cfg->last_lun_index[chan]) { | |
864 | rc = -ENOSPC; | |
865 | goto out; | |
866 | } | |
867 | ||
868 | lind = lli->lun_index = cfg->last_lun_index[chan]; | |
869 | writeq_be(lli->lun_id[chan], &agm->fc_port[chan][lind]); | |
870 | cfg->last_lun_index[chan]--; | |
871 | pr_debug("%s: Virtual LUN on slot %d chan=%d, id=%llx\n", | |
872 | __func__, lind, chan, lli->lun_id[chan]); | |
873 | } | |
874 | ||
875 | lli->in_table = true; | |
876 | out: | |
877 | mutex_unlock(&global.mutex); | |
878 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
879 | return rc; | |
880 | } | |
881 | ||
882 | /** | |
883 | * cxlflash_disk_virtual_open() - open a virtual disk of specified size | |
884 | * @sdev: SCSI device associated with LUN owning virtual LUN. | |
885 | * @arg: UVirtual ioctl data structure. | |
886 | * | |
887 | * On successful return, the user is informed of the resource handle | |
888 | * to be used to identify the virtual lun and the size (in blocks) of | |
889 | * the virtual lun in last LBA format. When the size of the virtual lun | |
890 | * is zero, the last LBA is reflected as -1. | |
891 | * | |
892 | * Return: 0 on success, -errno on failure | |
893 | */ | |
894 | int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg) | |
895 | { | |
896 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
897 | struct device *dev = &cfg->dev->dev; | |
898 | struct llun_info *lli = sdev->hostdata; | |
899 | struct glun_info *gli = lli->parent; | |
900 | ||
901 | struct dk_cxlflash_uvirtual *virt = (struct dk_cxlflash_uvirtual *)arg; | |
902 | struct dk_cxlflash_resize resize; | |
903 | ||
904 | u64 ctxid = DECODE_CTXID(virt->context_id), | |
905 | rctxid = virt->context_id; | |
906 | u64 lun_size = virt->lun_size; | |
907 | u64 last_lba = 0; | |
908 | u64 rsrc_handle = -1; | |
909 | ||
910 | int rc = 0; | |
911 | ||
912 | struct ctx_info *ctxi = NULL; | |
913 | struct sisl_rht_entry *rhte = NULL; | |
914 | ||
915 | pr_debug("%s: ctxid=%llu ls=0x%llx\n", __func__, ctxid, lun_size); | |
916 | ||
917 | mutex_lock(&gli->mutex); | |
918 | if (gli->mode == MODE_NONE) { | |
919 | /* Setup the LUN table and block allocator on first call */ | |
920 | rc = init_luntable(cfg, lli); | |
921 | if (rc) { | |
922 | dev_err(dev, "%s: call to init_luntable failed " | |
923 | "rc=%d!\n", __func__, rc); | |
924 | goto err0; | |
925 | } | |
926 | ||
927 | rc = init_vlun(lli); | |
928 | if (rc) { | |
929 | dev_err(dev, "%s: call to init_vlun failed rc=%d!\n", | |
930 | __func__, rc); | |
931 | rc = -ENOMEM; | |
932 | goto err0; | |
933 | } | |
934 | } | |
935 | ||
936 | rc = cxlflash_lun_attach(gli, MODE_VIRTUAL, true); | |
937 | if (unlikely(rc)) { | |
938 | dev_err(dev, "%s: Failed to attach to LUN! (VIRTUAL)\n", | |
939 | __func__); | |
940 | goto err0; | |
941 | } | |
942 | mutex_unlock(&gli->mutex); | |
943 | ||
944 | ctxi = get_context(cfg, rctxid, lli, 0); | |
945 | if (unlikely(!ctxi)) { | |
946 | dev_err(dev, "%s: Bad context! (%llu)\n", __func__, ctxid); | |
947 | rc = -EINVAL; | |
948 | goto err1; | |
949 | } | |
950 | ||
951 | rhte = rhte_checkout(ctxi, lli); | |
952 | if (unlikely(!rhte)) { | |
953 | dev_err(dev, "%s: too many opens for this context\n", __func__); | |
954 | rc = -EMFILE; /* too many opens */ | |
955 | goto err1; | |
956 | } | |
957 | ||
958 | rsrc_handle = (rhte - ctxi->rht_start); | |
959 | ||
960 | /* Populate RHT format 0 */ | |
961 | rhte->nmask = MC_RHT_NMASK; | |
962 | rhte->fp = SISL_RHT_FP(0U, ctxi->rht_perms); | |
963 | ||
964 | /* Resize even if requested size is 0 */ | |
965 | marshal_virt_to_resize(virt, &resize); | |
966 | resize.rsrc_handle = rsrc_handle; | |
967 | rc = _cxlflash_vlun_resize(sdev, ctxi, &resize); | |
968 | if (rc) { | |
969 | dev_err(dev, "%s: resize failed rc %d\n", __func__, rc); | |
970 | goto err2; | |
971 | } | |
972 | last_lba = resize.last_lba; | |
973 | ||
974 | if (virt->hdr.flags & DK_CXLFLASH_UVIRTUAL_NEED_WRITE_SAME) | |
975 | ctxi->rht_needs_ws[rsrc_handle] = true; | |
976 | ||
977 | virt->hdr.return_flags = 0; | |
978 | virt->last_lba = last_lba; | |
979 | virt->rsrc_handle = rsrc_handle; | |
980 | ||
981 | out: | |
982 | if (likely(ctxi)) | |
983 | put_context(ctxi); | |
984 | pr_debug("%s: returning handle 0x%llx rc=%d llba %lld\n", | |
985 | __func__, rsrc_handle, rc, last_lba); | |
986 | return rc; | |
987 | ||
988 | err2: | |
989 | rhte_checkin(ctxi, rhte); | |
990 | err1: | |
991 | cxlflash_lun_detach(gli); | |
992 | goto out; | |
993 | err0: | |
994 | /* Special common cleanup prior to successful LUN attach */ | |
995 | cxlflash_ba_terminate(&gli->blka.ba_lun); | |
996 | mutex_unlock(&gli->mutex); | |
997 | goto out; | |
998 | } | |
999 | ||
1000 | /** | |
1001 | * clone_lxt() - copies translation tables from source to destination RHTE | |
1002 | * @afu: AFU associated with the host. | |
1003 | * @blka: Block allocator associated with LUN. | |
1004 | * @ctxid: Context ID of context owning the RHTE. | |
1005 | * @rhndl: Resource handle associated with the RHTE. | |
1006 | * @rhte: Destination resource handle entry (RHTE). | |
1007 | * @rhte_src: Source resource handle entry (RHTE). | |
1008 | * | |
1009 | * Return: 0 on success, -errno on failure | |
1010 | */ | |
1011 | static int clone_lxt(struct afu *afu, | |
1012 | struct blka *blka, | |
1013 | ctx_hndl_t ctxid, | |
1014 | res_hndl_t rhndl, | |
1015 | struct sisl_rht_entry *rhte, | |
1016 | struct sisl_rht_entry *rhte_src) | |
1017 | { | |
1018 | struct sisl_lxt_entry *lxt; | |
1019 | u32 ngrps; | |
1020 | u64 aun; /* chunk# allocated by block allocator */ | |
1021 | int i, j; | |
1022 | ||
1023 | ngrps = LXT_NUM_GROUPS(rhte_src->lxt_cnt); | |
1024 | ||
1025 | if (ngrps) { | |
1026 | /* allocate new LXTs for clone */ | |
1027 | lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), | |
1028 | GFP_KERNEL); | |
1029 | if (unlikely(!lxt)) | |
1030 | return -ENOMEM; | |
1031 | ||
1032 | /* copy over */ | |
1033 | memcpy(lxt, rhte_src->lxt_start, | |
1034 | (sizeof(*lxt) * rhte_src->lxt_cnt)); | |
1035 | ||
1036 | /* clone the LBAs in block allocator via ref_cnt */ | |
1037 | mutex_lock(&blka->mutex); | |
1038 | for (i = 0; i < rhte_src->lxt_cnt; i++) { | |
1039 | aun = (lxt[i].rlba_base >> MC_CHUNK_SHIFT); | |
1040 | if (ba_clone(&blka->ba_lun, aun) == -1ULL) { | |
1041 | /* free the clones already made */ | |
1042 | for (j = 0; j < i; j++) { | |
1043 | aun = (lxt[j].rlba_base >> | |
1044 | MC_CHUNK_SHIFT); | |
1045 | ba_free(&blka->ba_lun, aun); | |
1046 | } | |
1047 | ||
1048 | mutex_unlock(&blka->mutex); | |
1049 | kfree(lxt); | |
1050 | return -EIO; | |
1051 | } | |
1052 | } | |
1053 | mutex_unlock(&blka->mutex); | |
1054 | } else { | |
1055 | lxt = NULL; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * The following sequence is prescribed in the SISlite spec | |
1060 | * for syncing up with the AFU when adding LXT entries. | |
1061 | */ | |
1062 | dma_wmb(); /* Make LXT updates are visible */ | |
1063 | ||
1064 | rhte->lxt_start = lxt; | |
1065 | dma_wmb(); /* Make RHT entry's LXT table update visible */ | |
1066 | ||
1067 | rhte->lxt_cnt = rhte_src->lxt_cnt; | |
1068 | dma_wmb(); /* Make RHT entry's LXT table size update visible */ | |
1069 | ||
1070 | cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC); | |
1071 | ||
1072 | pr_debug("%s: returning\n", __func__); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * cxlflash_disk_clone() - clone a context by making snapshot of another | |
1078 | * @sdev: SCSI device associated with LUN owning virtual LUN. | |
1079 | * @clone: Clone ioctl data structure. | |
1080 | * | |
1081 | * This routine effectively performs cxlflash_disk_open operation for each | |
1082 | * in-use virtual resource in the source context. Note that the destination | |
1083 | * context must be in pristine state and cannot have any resource handles | |
1084 | * open at the time of the clone. | |
1085 | * | |
1086 | * Return: 0 on success, -errno on failure | |
1087 | */ | |
1088 | int cxlflash_disk_clone(struct scsi_device *sdev, | |
1089 | struct dk_cxlflash_clone *clone) | |
1090 | { | |
1091 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1092 | struct llun_info *lli = sdev->hostdata; | |
1093 | struct glun_info *gli = lli->parent; | |
1094 | struct blka *blka = &gli->blka; | |
1095 | struct afu *afu = cfg->afu; | |
1096 | struct dk_cxlflash_release release = { { 0 }, 0 }; | |
1097 | ||
1098 | struct ctx_info *ctxi_src = NULL, | |
1099 | *ctxi_dst = NULL; | |
1100 | struct lun_access *lun_access_src, *lun_access_dst; | |
1101 | u32 perms; | |
1102 | u64 ctxid_src = DECODE_CTXID(clone->context_id_src), | |
1103 | ctxid_dst = DECODE_CTXID(clone->context_id_dst), | |
1104 | rctxid_src = clone->context_id_src, | |
1105 | rctxid_dst = clone->context_id_dst; | |
1106 | int adap_fd_src = clone->adap_fd_src; | |
1107 | int i, j; | |
1108 | int rc = 0; | |
1109 | bool found; | |
1110 | LIST_HEAD(sidecar); | |
1111 | ||
1112 | pr_debug("%s: ctxid_src=%llu ctxid_dst=%llu adap_fd_src=%d\n", | |
1113 | __func__, ctxid_src, ctxid_dst, adap_fd_src); | |
1114 | ||
1115 | /* Do not clone yourself */ | |
1116 | if (unlikely(rctxid_src == rctxid_dst)) { | |
1117 | rc = -EINVAL; | |
1118 | goto out; | |
1119 | } | |
1120 | ||
1121 | if (unlikely(gli->mode != MODE_VIRTUAL)) { | |
1122 | rc = -EINVAL; | |
1123 | pr_debug("%s: Clone not supported on physical LUNs! (%d)\n", | |
1124 | __func__, gli->mode); | |
1125 | goto out; | |
1126 | } | |
1127 | ||
1128 | ctxi_src = get_context(cfg, rctxid_src, lli, CTX_CTRL_CLONE); | |
1129 | ctxi_dst = get_context(cfg, rctxid_dst, lli, 0); | |
1130 | if (unlikely(!ctxi_src || !ctxi_dst)) { | |
1131 | pr_debug("%s: Bad context! (%llu,%llu)\n", __func__, | |
1132 | ctxid_src, ctxid_dst); | |
1133 | rc = -EINVAL; | |
1134 | goto out; | |
1135 | } | |
1136 | ||
1137 | if (unlikely(adap_fd_src != ctxi_src->lfd)) { | |
1138 | pr_debug("%s: Invalid source adapter fd! (%d)\n", | |
1139 | __func__, adap_fd_src); | |
1140 | rc = -EINVAL; | |
1141 | goto out; | |
1142 | } | |
1143 | ||
1144 | /* Verify there is no open resource handle in the destination context */ | |
1145 | for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) | |
1146 | if (ctxi_dst->rht_start[i].nmask != 0) { | |
1147 | rc = -EINVAL; | |
1148 | goto out; | |
1149 | } | |
1150 | ||
1151 | /* Clone LUN access list */ | |
1152 | list_for_each_entry(lun_access_src, &ctxi_src->luns, list) { | |
1153 | found = false; | |
1154 | list_for_each_entry(lun_access_dst, &ctxi_dst->luns, list) | |
1155 | if (lun_access_dst->sdev == lun_access_src->sdev) { | |
1156 | found = true; | |
1157 | break; | |
1158 | } | |
1159 | ||
1160 | if (!found) { | |
1161 | lun_access_dst = kzalloc(sizeof(*lun_access_dst), | |
1162 | GFP_KERNEL); | |
1163 | if (unlikely(!lun_access_dst)) { | |
1164 | pr_err("%s: Unable to allocate lun_access!\n", | |
1165 | __func__); | |
1166 | rc = -ENOMEM; | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | *lun_access_dst = *lun_access_src; | |
1171 | list_add(&lun_access_dst->list, &sidecar); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | if (unlikely(!ctxi_src->rht_out)) { | |
1176 | pr_debug("%s: Nothing to clone!\n", __func__); | |
1177 | goto out_success; | |
1178 | } | |
1179 | ||
1180 | /* User specified permission on attach */ | |
1181 | perms = ctxi_dst->rht_perms; | |
1182 | ||
1183 | /* | |
1184 | * Copy over checked-out RHT (and their associated LXT) entries by | |
1185 | * hand, stopping after we've copied all outstanding entries and | |
1186 | * cleaning up if the clone fails. | |
1187 | * | |
1188 | * Note: This loop is equivalent to performing cxlflash_disk_open and | |
1189 | * cxlflash_vlun_resize. As such, LUN accounting needs to be taken into | |
1190 | * account by attaching after each successful RHT entry clone. In the | |
1191 | * event that a clone failure is experienced, the LUN detach is handled | |
1192 | * via the cleanup performed by _cxlflash_disk_release. | |
1193 | */ | |
1194 | for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) { | |
1195 | if (ctxi_src->rht_out == ctxi_dst->rht_out) | |
1196 | break; | |
1197 | if (ctxi_src->rht_start[i].nmask == 0) | |
1198 | continue; | |
1199 | ||
1200 | /* Consume a destination RHT entry */ | |
1201 | ctxi_dst->rht_out++; | |
1202 | ctxi_dst->rht_start[i].nmask = ctxi_src->rht_start[i].nmask; | |
1203 | ctxi_dst->rht_start[i].fp = | |
1204 | SISL_RHT_FP_CLONE(ctxi_src->rht_start[i].fp, perms); | |
1205 | ctxi_dst->rht_lun[i] = ctxi_src->rht_lun[i]; | |
1206 | ||
1207 | rc = clone_lxt(afu, blka, ctxid_dst, i, | |
1208 | &ctxi_dst->rht_start[i], | |
1209 | &ctxi_src->rht_start[i]); | |
1210 | if (rc) { | |
1211 | marshal_clone_to_rele(clone, &release); | |
1212 | for (j = 0; j < i; j++) { | |
1213 | release.rsrc_handle = j; | |
1214 | _cxlflash_disk_release(sdev, ctxi_dst, | |
1215 | &release); | |
1216 | } | |
1217 | ||
1218 | /* Put back the one we failed on */ | |
1219 | rhte_checkin(ctxi_dst, &ctxi_dst->rht_start[i]); | |
1220 | goto err; | |
1221 | } | |
1222 | ||
1223 | cxlflash_lun_attach(gli, gli->mode, false); | |
1224 | } | |
1225 | ||
1226 | out_success: | |
1227 | list_splice(&sidecar, &ctxi_dst->luns); | |
1228 | sys_close(adap_fd_src); | |
1229 | ||
1230 | /* fall through */ | |
1231 | out: | |
1232 | if (ctxi_src) | |
1233 | put_context(ctxi_src); | |
1234 | if (ctxi_dst) | |
1235 | put_context(ctxi_dst); | |
1236 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1237 | return rc; | |
1238 | ||
1239 | err: | |
1240 | list_for_each_entry_safe(lun_access_src, lun_access_dst, &sidecar, list) | |
1241 | kfree(lun_access_src); | |
1242 | goto out; | |
1243 | } |