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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 | ||
fb67d44d MO |
69 | pr_debug("%s: Initializing LUN: lun_id=%016llx " |
70 | "ba_lun->lsize=%lx ba_lun->au_size=%lX\n", | |
2cb79266 MO |
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)) { | |
fb67d44d | 83 | pr_err("%s: Failed to allocate lun_info lun_id=%016llx\n", |
2cb79266 MO |
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: " | |
fb67d44d | 99 | "lun_id=%016llx\n", __func__, ba_lun->lun_id); |
2cb79266 MO |
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)) { | |
fb67d44d | 128 | pr_err("%s: Failed to allocate clone map: lun_id=%016llx\n", |
2cb79266 MO |
129 | __func__, ba_lun->lun_id); |
130 | kfree(bali->lun_alloc_map); | |
131 | kfree(bali); | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
f15fbf8d | 135 | /* Pass the allocated LUN info as a handle to the user */ |
2cb79266 MO |
136 | ba_lun->ba_lun_handle = bali; |
137 | ||
138 | pr_debug("%s: Successfully initialized the LUN: " | |
fb67d44d | 139 | "lun_id=%016llx bitmap size=%x, free_aun_cnt=%llx\n", |
2cb79266 MO |
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 | ||
fb67d44d MO |
168 | pr_devel("%s: Found free bit %llu in LUN " |
169 | "map entry %016llx at bitmap index = %d\n", | |
170 | __func__, bit_pos, bali->lun_alloc_map[i], i); | |
2cb79266 MO |
171 | |
172 | *bit_word = i; | |
173 | bali->free_aun_cnt--; | |
174 | clear_bit(bit_pos, lam); | |
175 | break; | |
176 | } | |
177 | ||
178 | return bit_pos; | |
179 | } | |
180 | ||
181 | /** | |
182 | * ba_alloc() - allocates a block from the block allocator | |
183 | * @ba_lun: Block allocator from which to allocate a block. | |
184 | * | |
185 | * Return: The allocated block, -1 on failure | |
186 | */ | |
187 | static u64 ba_alloc(struct ba_lun *ba_lun) | |
188 | { | |
189 | u64 bit_pos = -1; | |
190 | int bit_word = 0; | |
191 | struct ba_lun_info *bali = NULL; | |
192 | ||
193 | bali = ba_lun->ba_lun_handle; | |
194 | ||
195 | pr_debug("%s: Received block allocation request: " | |
fb67d44d | 196 | "lun_id=%016llx free_aun_cnt=%llx\n", |
2cb79266 MO |
197 | __func__, ba_lun->lun_id, bali->free_aun_cnt); |
198 | ||
199 | if (bali->free_aun_cnt == 0) { | |
fb67d44d | 200 | pr_debug("%s: No space left on LUN: lun_id=%016llx\n", |
2cb79266 MO |
201 | __func__, ba_lun->lun_id); |
202 | return -1ULL; | |
203 | } | |
204 | ||
205 | /* Search to find a free entry, curr->high then low->curr */ | |
206 | bit_pos = find_free_range(bali->free_curr_idx, | |
207 | bali->free_high_idx, bali, &bit_word); | |
208 | if (bit_pos == -1) { | |
209 | bit_pos = find_free_range(bali->free_low_idx, | |
210 | bali->free_curr_idx, | |
211 | bali, &bit_word); | |
212 | if (bit_pos == -1) { | |
213 | pr_debug("%s: Could not find an allocation unit on LUN:" | |
fb67d44d | 214 | " lun_id=%016llx\n", __func__, ba_lun->lun_id); |
2cb79266 MO |
215 | return -1ULL; |
216 | } | |
217 | } | |
218 | ||
219 | /* Update the free_curr_idx */ | |
220 | if (bit_pos == HIBIT) | |
221 | bali->free_curr_idx = bit_word + 1; | |
222 | else | |
223 | bali->free_curr_idx = bit_word; | |
224 | ||
fb67d44d MO |
225 | pr_debug("%s: Allocating AU number=%llx lun_id=%016llx " |
226 | "free_aun_cnt=%llx\n", __func__, | |
2cb79266 MO |
227 | ((bit_word * BITS_PER_LONG) + bit_pos), ba_lun->lun_id, |
228 | bali->free_aun_cnt); | |
229 | ||
230 | return (u64) ((bit_word * BITS_PER_LONG) + bit_pos); | |
231 | } | |
232 | ||
233 | /** | |
234 | * validate_alloc() - validates the specified block has been allocated | |
235 | * @ba_lun_info: LUN info owning the block allocator. | |
236 | * @aun: Block to validate. | |
237 | * | |
238 | * Return: 0 on success, -1 on failure | |
239 | */ | |
240 | static int validate_alloc(struct ba_lun_info *bali, u64 aun) | |
241 | { | |
242 | int idx = 0, bit_pos = 0; | |
243 | ||
244 | idx = aun / BITS_PER_LONG; | |
245 | bit_pos = aun % BITS_PER_LONG; | |
246 | ||
247 | if (test_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx])) | |
248 | return -1; | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | /** | |
254 | * ba_free() - frees a block from the block allocator | |
255 | * @ba_lun: Block allocator from which to allocate a block. | |
256 | * @to_free: Block to free. | |
257 | * | |
258 | * Return: 0 on success, -1 on failure | |
259 | */ | |
260 | static int ba_free(struct ba_lun *ba_lun, u64 to_free) | |
261 | { | |
262 | int idx = 0, bit_pos = 0; | |
263 | struct ba_lun_info *bali = NULL; | |
264 | ||
265 | bali = ba_lun->ba_lun_handle; | |
266 | ||
267 | if (validate_alloc(bali, to_free)) { | |
fb67d44d | 268 | pr_debug("%s: AUN %llx is not allocated on lun_id=%016llx\n", |
2cb79266 MO |
269 | __func__, to_free, ba_lun->lun_id); |
270 | return -1; | |
271 | } | |
272 | ||
fb67d44d MO |
273 | pr_debug("%s: Received a request to free AU=%llx lun_id=%016llx " |
274 | "free_aun_cnt=%llx\n", __func__, to_free, ba_lun->lun_id, | |
2cb79266 MO |
275 | bali->free_aun_cnt); |
276 | ||
277 | if (bali->aun_clone_map[to_free] > 0) { | |
fb67d44d MO |
278 | pr_debug("%s: AUN %llx lun_id=%016llx cloned. Clone count=%x\n", |
279 | __func__, to_free, ba_lun->lun_id, | |
2cb79266 MO |
280 | bali->aun_clone_map[to_free]); |
281 | bali->aun_clone_map[to_free]--; | |
282 | return 0; | |
283 | } | |
284 | ||
285 | idx = to_free / BITS_PER_LONG; | |
286 | bit_pos = to_free % BITS_PER_LONG; | |
287 | ||
288 | set_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx]); | |
289 | bali->free_aun_cnt++; | |
290 | ||
291 | if (idx < bali->free_low_idx) | |
292 | bali->free_low_idx = idx; | |
293 | else if (idx > bali->free_high_idx) | |
294 | bali->free_high_idx = idx; | |
295 | ||
fb67d44d MO |
296 | pr_debug("%s: Successfully freed AU bit_pos=%x bit map index=%x " |
297 | "lun_id=%016llx free_aun_cnt=%llx\n", __func__, bit_pos, idx, | |
2cb79266 MO |
298 | ba_lun->lun_id, bali->free_aun_cnt); |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | /** | |
304 | * ba_clone() - Clone a chunk of the block allocation table | |
305 | * @ba_lun: Block allocator from which to allocate a block. | |
306 | * @to_free: Block to free. | |
307 | * | |
308 | * Return: 0 on success, -1 on failure | |
309 | */ | |
310 | static int ba_clone(struct ba_lun *ba_lun, u64 to_clone) | |
311 | { | |
312 | struct ba_lun_info *bali = ba_lun->ba_lun_handle; | |
313 | ||
314 | if (validate_alloc(bali, to_clone)) { | |
fb67d44d | 315 | pr_debug("%s: AUN=%llx not allocated on lun_id=%016llx\n", |
2cb79266 MO |
316 | __func__, to_clone, ba_lun->lun_id); |
317 | return -1; | |
318 | } | |
319 | ||
fb67d44d | 320 | pr_debug("%s: Received a request to clone AUN %llx on lun_id=%016llx\n", |
2cb79266 MO |
321 | __func__, to_clone, ba_lun->lun_id); |
322 | ||
323 | if (bali->aun_clone_map[to_clone] == MAX_AUN_CLONE_CNT) { | |
fb67d44d | 324 | pr_debug("%s: AUN %llx on lun_id=%016llx hit max clones already\n", |
2cb79266 MO |
325 | __func__, to_clone, ba_lun->lun_id); |
326 | return -1; | |
327 | } | |
328 | ||
329 | bali->aun_clone_map[to_clone]++; | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | /** | |
335 | * ba_space() - returns the amount of free space left in the block allocator | |
336 | * @ba_lun: Block allocator. | |
337 | * | |
338 | * Return: Amount of free space in block allocator | |
339 | */ | |
340 | static u64 ba_space(struct ba_lun *ba_lun) | |
341 | { | |
342 | struct ba_lun_info *bali = ba_lun->ba_lun_handle; | |
343 | ||
344 | return bali->free_aun_cnt; | |
345 | } | |
346 | ||
347 | /** | |
348 | * cxlflash_ba_terminate() - frees resources associated with the block allocator | |
349 | * @ba_lun: Block allocator. | |
350 | * | |
351 | * Safe to call in a partially allocated state. | |
352 | */ | |
353 | void cxlflash_ba_terminate(struct ba_lun *ba_lun) | |
354 | { | |
355 | struct ba_lun_info *bali = ba_lun->ba_lun_handle; | |
356 | ||
357 | if (bali) { | |
358 | kfree(bali->aun_clone_map); | |
359 | kfree(bali->lun_alloc_map); | |
360 | kfree(bali); | |
361 | ba_lun->ba_lun_handle = NULL; | |
362 | } | |
363 | } | |
364 | ||
365 | /** | |
366 | * init_vlun() - initializes a LUN for virtual use | |
367 | * @lun_info: LUN information structure that owns the block allocator. | |
368 | * | |
369 | * Return: 0 on success, -errno on failure | |
370 | */ | |
371 | static int init_vlun(struct llun_info *lli) | |
372 | { | |
373 | int rc = 0; | |
374 | struct glun_info *gli = lli->parent; | |
375 | struct blka *blka = &gli->blka; | |
376 | ||
377 | memset(blka, 0, sizeof(*blka)); | |
378 | mutex_init(&blka->mutex); | |
379 | ||
380 | /* LUN IDs are unique per port, save the index instead */ | |
381 | blka->ba_lun.lun_id = lli->lun_index; | |
382 | blka->ba_lun.lsize = gli->max_lba + 1; | |
383 | blka->ba_lun.lba_size = gli->blk_len; | |
384 | ||
385 | blka->ba_lun.au_size = MC_CHUNK_SIZE; | |
386 | blka->nchunk = blka->ba_lun.lsize / MC_CHUNK_SIZE; | |
387 | ||
388 | rc = ba_init(&blka->ba_lun); | |
389 | if (unlikely(rc)) | |
390 | pr_debug("%s: cannot init block_alloc, rc=%d\n", __func__, rc); | |
391 | ||
392 | pr_debug("%s: returning rc=%d lli=%p\n", __func__, rc, lli); | |
393 | return rc; | |
394 | } | |
395 | ||
396 | /** | |
397 | * write_same16() - sends a SCSI WRITE_SAME16 (0) command to specified LUN | |
398 | * @sdev: SCSI device associated with LUN. | |
399 | * @lba: Logical block address to start write same. | |
400 | * @nblks: Number of logical blocks to write same. | |
401 | * | |
aacb4ff6 MO |
402 | * The SCSI WRITE_SAME16 can take quite a while to complete. Should an EEH occur |
403 | * while in scsi_execute(), the EEH handler will attempt to recover. As part of | |
404 | * the recovery, the handler drains all currently running ioctls, waiting until | |
405 | * they have completed before proceeding with a reset. As this routine is used | |
406 | * on the ioctl path, this can create a condition where the EEH handler becomes | |
407 | * stuck, infinitely waiting for this ioctl thread. To avoid this behavior, | |
408 | * temporarily unmark this thread as an ioctl thread by releasing the ioctl read | |
409 | * semaphore. This will allow the EEH handler to proceed with a recovery while | |
410 | * this thread is still running. Once the scsi_execute() returns, reacquire the | |
411 | * ioctl read semaphore and check the adapter state in case it changed while | |
412 | * inside of scsi_execute(). The state check will wait if the adapter is still | |
413 | * being recovered or return a failure if the recovery failed. In the event that | |
414 | * the adapter reset failed, simply return the failure as the ioctl would be | |
415 | * unable to continue. | |
416 | * | |
417 | * Note that the above puts a requirement on this routine to only be called on | |
418 | * an ioctl thread. | |
419 | * | |
2cb79266 MO |
420 | * Return: 0 on success, -errno on failure |
421 | */ | |
422 | static int write_same16(struct scsi_device *sdev, | |
423 | u64 lba, | |
424 | u32 nblks) | |
425 | { | |
426 | u8 *cmd_buf = NULL; | |
427 | u8 *scsi_cmd = NULL; | |
428 | u8 *sense_buf = NULL; | |
429 | int rc = 0; | |
430 | int result = 0; | |
2cb79266 MO |
431 | u64 offset = lba; |
432 | int left = nblks; | |
fb67d44d | 433 | struct cxlflash_cfg *cfg = shost_priv(sdev->host); |
2cb79266 | 434 | struct device *dev = &cfg->dev->dev; |
9404e199 MO |
435 | const u32 s = ilog2(sdev->sector_size) - 9; |
436 | const u32 to = sdev->request_queue->rq_timeout; | |
437 | const u32 ws_limit = blk_queue_get_max_sectors(sdev->request_queue, | |
438 | REQ_OP_WRITE_SAME) >> s; | |
2cb79266 MO |
439 | |
440 | cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL); | |
441 | scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL); | |
442 | sense_buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL); | |
443 | if (unlikely(!cmd_buf || !scsi_cmd || !sense_buf)) { | |
444 | rc = -ENOMEM; | |
445 | goto out; | |
446 | } | |
447 | ||
448 | while (left > 0) { | |
449 | ||
450 | scsi_cmd[0] = WRITE_SAME_16; | |
3223c01a | 451 | scsi_cmd[1] = cfg->ws_unmap ? 0x8 : 0; |
2cb79266 MO |
452 | put_unaligned_be64(offset, &scsi_cmd[2]); |
453 | put_unaligned_be32(ws_limit < left ? ws_limit : left, | |
454 | &scsi_cmd[10]); | |
455 | ||
aacb4ff6 MO |
456 | /* Drop the ioctl read semahpore across lengthy call */ |
457 | up_read(&cfg->ioctl_rwsem); | |
2cb79266 | 458 | result = scsi_execute(sdev, scsi_cmd, DMA_TO_DEVICE, cmd_buf, |
76aaf87b CH |
459 | CMD_BUFSIZE, sense_buf, NULL, to, |
460 | CMD_RETRIES, 0, 0, NULL); | |
aacb4ff6 MO |
461 | down_read(&cfg->ioctl_rwsem); |
462 | rc = check_state(cfg); | |
463 | if (rc) { | |
fb67d44d | 464 | dev_err(dev, "%s: Failed state result=%08x\n", |
aacb4ff6 MO |
465 | __func__, result); |
466 | rc = -ENODEV; | |
467 | goto out; | |
468 | } | |
469 | ||
2cb79266 MO |
470 | if (result) { |
471 | dev_err_ratelimited(dev, "%s: command failed for " | |
fb67d44d | 472 | "offset=%lld result=%08x\n", |
2cb79266 MO |
473 | __func__, offset, result); |
474 | rc = -EIO; | |
475 | goto out; | |
476 | } | |
477 | left -= ws_limit; | |
478 | offset += ws_limit; | |
479 | } | |
480 | ||
481 | out: | |
482 | kfree(cmd_buf); | |
483 | kfree(scsi_cmd); | |
484 | kfree(sense_buf); | |
fb67d44d | 485 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
2cb79266 MO |
486 | return rc; |
487 | } | |
488 | ||
489 | /** | |
490 | * grow_lxt() - expands the translation table associated with the specified RHTE | |
491 | * @afu: AFU associated with the host. | |
492 | * @sdev: SCSI device associated with LUN. | |
493 | * @ctxid: Context ID of context owning the RHTE. | |
494 | * @rhndl: Resource handle associated with the RHTE. | |
495 | * @rhte: Resource handle entry (RHTE). | |
496 | * @new_size: Number of translation entries associated with RHTE. | |
497 | * | |
498 | * By design, this routine employs a 'best attempt' allocation and will | |
499 | * truncate the requested size down if there is not sufficient space in | |
500 | * the block allocator to satisfy the request but there does exist some | |
501 | * amount of space. The user is made aware of this by returning the size | |
502 | * allocated. | |
503 | * | |
504 | * Return: 0 on success, -errno on failure | |
505 | */ | |
506 | static int grow_lxt(struct afu *afu, | |
507 | struct scsi_device *sdev, | |
508 | ctx_hndl_t ctxid, | |
509 | res_hndl_t rhndl, | |
510 | struct sisl_rht_entry *rhte, | |
511 | u64 *new_size) | |
512 | { | |
fb67d44d MO |
513 | struct cxlflash_cfg *cfg = shost_priv(sdev->host); |
514 | struct device *dev = &cfg->dev->dev; | |
2cb79266 MO |
515 | struct sisl_lxt_entry *lxt = NULL, *lxt_old = NULL; |
516 | struct llun_info *lli = sdev->hostdata; | |
517 | struct glun_info *gli = lli->parent; | |
518 | struct blka *blka = &gli->blka; | |
519 | u32 av_size; | |
520 | u32 ngrps, ngrps_old; | |
521 | u64 aun; /* chunk# allocated by block allocator */ | |
522 | u64 delta = *new_size - rhte->lxt_cnt; | |
523 | u64 my_new_size; | |
524 | int i, rc = 0; | |
525 | ||
526 | /* | |
527 | * Check what is available in the block allocator before re-allocating | |
528 | * LXT array. This is done up front under the mutex which must not be | |
529 | * released until after allocation is complete. | |
530 | */ | |
531 | mutex_lock(&blka->mutex); | |
532 | av_size = ba_space(&blka->ba_lun); | |
533 | if (unlikely(av_size <= 0)) { | |
fb67d44d MO |
534 | dev_dbg(dev, "%s: ba_space error av_size=%d\n", |
535 | __func__, av_size); | |
2cb79266 MO |
536 | mutex_unlock(&blka->mutex); |
537 | rc = -ENOSPC; | |
538 | goto out; | |
539 | } | |
540 | ||
541 | if (av_size < delta) | |
542 | delta = av_size; | |
543 | ||
544 | lxt_old = rhte->lxt_start; | |
545 | ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt); | |
546 | ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt + delta); | |
547 | ||
548 | if (ngrps != ngrps_old) { | |
549 | /* reallocate to fit new size */ | |
550 | lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), | |
551 | GFP_KERNEL); | |
552 | if (unlikely(!lxt)) { | |
553 | mutex_unlock(&blka->mutex); | |
554 | rc = -ENOMEM; | |
555 | goto out; | |
556 | } | |
557 | ||
558 | /* copy over all old entries */ | |
559 | memcpy(lxt, lxt_old, (sizeof(*lxt) * rhte->lxt_cnt)); | |
560 | } else | |
561 | lxt = lxt_old; | |
562 | ||
563 | /* nothing can fail from now on */ | |
564 | my_new_size = rhte->lxt_cnt + delta; | |
565 | ||
566 | /* add new entries to the end */ | |
567 | for (i = rhte->lxt_cnt; i < my_new_size; i++) { | |
568 | /* | |
569 | * Due to the earlier check of available space, ba_alloc | |
570 | * cannot fail here. If it did due to internal error, | |
571 | * leave a rlba_base of -1u which will likely be a | |
572 | * invalid LUN (too large). | |
573 | */ | |
574 | aun = ba_alloc(&blka->ba_lun); | |
575 | if ((aun == -1ULL) || (aun >= blka->nchunk)) | |
fb67d44d MO |
576 | dev_dbg(dev, "%s: ba_alloc error allocated chunk=%llu " |
577 | "max=%llu\n", __func__, aun, blka->nchunk - 1); | |
2cb79266 MO |
578 | |
579 | /* select both ports, use r/w perms from RHT */ | |
580 | lxt[i].rlba_base = ((aun << MC_CHUNK_SHIFT) | | |
581 | (lli->lun_index << LXT_LUNIDX_SHIFT) | | |
582 | (RHT_PERM_RW << LXT_PERM_SHIFT | | |
583 | lli->port_sel)); | |
584 | } | |
585 | ||
586 | mutex_unlock(&blka->mutex); | |
587 | ||
588 | /* | |
589 | * The following sequence is prescribed in the SISlite spec | |
590 | * for syncing up with the AFU when adding LXT entries. | |
591 | */ | |
592 | dma_wmb(); /* Make LXT updates are visible */ | |
593 | ||
594 | rhte->lxt_start = lxt; | |
595 | dma_wmb(); /* Make RHT entry's LXT table update visible */ | |
596 | ||
597 | rhte->lxt_cnt = my_new_size; | |
598 | dma_wmb(); /* Make RHT entry's LXT table size update visible */ | |
599 | ||
c2c292f4 UK |
600 | rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC); |
601 | if (unlikely(rc)) | |
602 | rc = -EAGAIN; | |
2cb79266 MO |
603 | |
604 | /* free old lxt if reallocated */ | |
605 | if (lxt != lxt_old) | |
606 | kfree(lxt_old); | |
607 | *new_size = my_new_size; | |
608 | out: | |
fb67d44d | 609 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
2cb79266 MO |
610 | return rc; |
611 | } | |
612 | ||
613 | /** | |
614 | * shrink_lxt() - reduces translation table associated with the specified RHTE | |
615 | * @afu: AFU associated with the host. | |
616 | * @sdev: SCSI device associated with LUN. | |
617 | * @rhndl: Resource handle associated with the RHTE. | |
618 | * @rhte: Resource handle entry (RHTE). | |
619 | * @ctxi: Context owning resources. | |
620 | * @new_size: Number of translation entries associated with RHTE. | |
621 | * | |
622 | * Return: 0 on success, -errno on failure | |
623 | */ | |
624 | static int shrink_lxt(struct afu *afu, | |
625 | struct scsi_device *sdev, | |
626 | res_hndl_t rhndl, | |
627 | struct sisl_rht_entry *rhte, | |
628 | struct ctx_info *ctxi, | |
629 | u64 *new_size) | |
630 | { | |
fb67d44d MO |
631 | struct cxlflash_cfg *cfg = shost_priv(sdev->host); |
632 | struct device *dev = &cfg->dev->dev; | |
2cb79266 MO |
633 | struct sisl_lxt_entry *lxt, *lxt_old; |
634 | struct llun_info *lli = sdev->hostdata; | |
635 | struct glun_info *gli = lli->parent; | |
636 | struct blka *blka = &gli->blka; | |
637 | ctx_hndl_t ctxid = DECODE_CTXID(ctxi->ctxid); | |
638 | bool needs_ws = ctxi->rht_needs_ws[rhndl]; | |
639 | bool needs_sync = !ctxi->err_recovery_active; | |
640 | u32 ngrps, ngrps_old; | |
641 | u64 aun; /* chunk# allocated by block allocator */ | |
642 | u64 delta = rhte->lxt_cnt - *new_size; | |
643 | u64 my_new_size; | |
644 | int i, rc = 0; | |
645 | ||
646 | lxt_old = rhte->lxt_start; | |
647 | ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt); | |
648 | ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt - delta); | |
649 | ||
650 | if (ngrps != ngrps_old) { | |
651 | /* Reallocate to fit new size unless new size is 0 */ | |
652 | if (ngrps) { | |
653 | lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), | |
654 | GFP_KERNEL); | |
655 | if (unlikely(!lxt)) { | |
656 | rc = -ENOMEM; | |
657 | goto out; | |
658 | } | |
659 | ||
660 | /* Copy over old entries that will remain */ | |
661 | memcpy(lxt, lxt_old, | |
662 | (sizeof(*lxt) * (rhte->lxt_cnt - delta))); | |
663 | } else | |
664 | lxt = NULL; | |
665 | } else | |
666 | lxt = lxt_old; | |
667 | ||
668 | /* Nothing can fail from now on */ | |
669 | my_new_size = rhte->lxt_cnt - delta; | |
670 | ||
671 | /* | |
672 | * The following sequence is prescribed in the SISlite spec | |
673 | * for syncing up with the AFU when removing LXT entries. | |
674 | */ | |
675 | rhte->lxt_cnt = my_new_size; | |
676 | dma_wmb(); /* Make RHT entry's LXT table size update visible */ | |
677 | ||
678 | rhte->lxt_start = lxt; | |
679 | dma_wmb(); /* Make RHT entry's LXT table update visible */ | |
680 | ||
c2c292f4 UK |
681 | if (needs_sync) { |
682 | rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); | |
683 | if (unlikely(rc)) | |
684 | rc = -EAGAIN; | |
685 | } | |
2cb79266 MO |
686 | |
687 | if (needs_ws) { | |
688 | /* | |
689 | * Mark the context as unavailable, so that we can release | |
690 | * the mutex safely. | |
691 | */ | |
692 | ctxi->unavail = true; | |
693 | mutex_unlock(&ctxi->mutex); | |
694 | } | |
695 | ||
696 | /* Free LBAs allocated to freed chunks */ | |
697 | mutex_lock(&blka->mutex); | |
698 | for (i = delta - 1; i >= 0; i--) { | |
806240e2 | 699 | aun = lxt_old[my_new_size + i].rlba_base >> MC_CHUNK_SHIFT; |
2cb79266 MO |
700 | if (needs_ws) |
701 | write_same16(sdev, aun, MC_CHUNK_SIZE); | |
702 | ba_free(&blka->ba_lun, aun); | |
703 | } | |
704 | mutex_unlock(&blka->mutex); | |
705 | ||
706 | if (needs_ws) { | |
707 | /* Make the context visible again */ | |
708 | mutex_lock(&ctxi->mutex); | |
709 | ctxi->unavail = false; | |
710 | } | |
711 | ||
712 | /* Free old lxt if reallocated */ | |
713 | if (lxt != lxt_old) | |
714 | kfree(lxt_old); | |
715 | *new_size = my_new_size; | |
716 | out: | |
fb67d44d | 717 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
2cb79266 MO |
718 | return rc; |
719 | } | |
720 | ||
721 | /** | |
f15fbf8d | 722 | * _cxlflash_vlun_resize() - changes the size of a virtual LUN |
2cb79266 MO |
723 | * @sdev: SCSI device associated with LUN owning virtual LUN. |
724 | * @ctxi: Context owning resources. | |
725 | * @resize: Resize ioctl data structure. | |
726 | * | |
727 | * On successful return, the user is informed of the new size (in blocks) | |
f15fbf8d MO |
728 | * of the virtual LUN in last LBA format. When the size of the virtual |
729 | * LUN is zero, the last LBA is reflected as -1. See comment in the | |
2cb79266 MO |
730 | * prologue for _cxlflash_disk_release() regarding AFU syncs and contexts |
731 | * on the error recovery list. | |
732 | * | |
733 | * Return: 0 on success, -errno on failure | |
734 | */ | |
735 | int _cxlflash_vlun_resize(struct scsi_device *sdev, | |
736 | struct ctx_info *ctxi, | |
737 | struct dk_cxlflash_resize *resize) | |
738 | { | |
fb67d44d MO |
739 | struct cxlflash_cfg *cfg = shost_priv(sdev->host); |
740 | struct device *dev = &cfg->dev->dev; | |
2cb79266 MO |
741 | struct llun_info *lli = sdev->hostdata; |
742 | struct glun_info *gli = lli->parent; | |
743 | struct afu *afu = cfg->afu; | |
744 | bool put_ctx = false; | |
745 | ||
746 | res_hndl_t rhndl = resize->rsrc_handle; | |
747 | u64 new_size; | |
748 | u64 nsectors; | |
749 | u64 ctxid = DECODE_CTXID(resize->context_id), | |
750 | rctxid = resize->context_id; | |
751 | ||
752 | struct sisl_rht_entry *rhte; | |
753 | ||
754 | int rc = 0; | |
755 | ||
756 | /* | |
757 | * The requested size (req_size) is always assumed to be in 4k blocks, | |
758 | * so we have to convert it here from 4k to chunk size. | |
759 | */ | |
760 | nsectors = (resize->req_size * CXLFLASH_BLOCK_SIZE) / gli->blk_len; | |
761 | new_size = DIV_ROUND_UP(nsectors, MC_CHUNK_SIZE); | |
762 | ||
fb67d44d MO |
763 | dev_dbg(dev, "%s: ctxid=%llu rhndl=%llu req_size=%llu new_size=%llu\n", |
764 | __func__, ctxid, resize->rsrc_handle, resize->req_size, | |
765 | new_size); | |
2cb79266 MO |
766 | |
767 | if (unlikely(gli->mode != MODE_VIRTUAL)) { | |
fb67d44d MO |
768 | dev_dbg(dev, "%s: LUN mode does not support resize mode=%d\n", |
769 | __func__, gli->mode); | |
2cb79266 MO |
770 | rc = -EINVAL; |
771 | goto out; | |
772 | ||
773 | } | |
774 | ||
775 | if (!ctxi) { | |
776 | ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); | |
777 | if (unlikely(!ctxi)) { | |
fb67d44d MO |
778 | dev_dbg(dev, "%s: Bad context ctxid=%llu\n", |
779 | __func__, ctxid); | |
2cb79266 MO |
780 | rc = -EINVAL; |
781 | goto out; | |
782 | } | |
783 | ||
784 | put_ctx = true; | |
785 | } | |
786 | ||
787 | rhte = get_rhte(ctxi, rhndl, lli); | |
788 | if (unlikely(!rhte)) { | |
fb67d44d MO |
789 | dev_dbg(dev, "%s: Bad resource handle rhndl=%u\n", |
790 | __func__, rhndl); | |
2cb79266 MO |
791 | rc = -EINVAL; |
792 | goto out; | |
793 | } | |
794 | ||
795 | if (new_size > rhte->lxt_cnt) | |
796 | rc = grow_lxt(afu, sdev, ctxid, rhndl, rhte, &new_size); | |
797 | else if (new_size < rhte->lxt_cnt) | |
798 | rc = shrink_lxt(afu, sdev, rhndl, rhte, ctxi, &new_size); | |
c2c292f4 UK |
799 | else { |
800 | /* | |
801 | * Rare case where there is already sufficient space, just | |
802 | * need to perform a translation sync with the AFU. This | |
803 | * scenario likely follows a previous sync failure during | |
804 | * a resize operation. Accordingly, perform the heavyweight | |
805 | * form of translation sync as it is unknown which type of | |
806 | * resize failed previously. | |
807 | */ | |
808 | rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); | |
809 | if (unlikely(rc)) { | |
810 | rc = -EAGAIN; | |
811 | goto out; | |
812 | } | |
813 | } | |
2cb79266 MO |
814 | |
815 | resize->hdr.return_flags = 0; | |
816 | resize->last_lba = (new_size * MC_CHUNK_SIZE * gli->blk_len); | |
817 | resize->last_lba /= CXLFLASH_BLOCK_SIZE; | |
818 | resize->last_lba--; | |
819 | ||
820 | out: | |
821 | if (put_ctx) | |
822 | put_context(ctxi); | |
fb67d44d MO |
823 | dev_dbg(dev, "%s: resized to %llu returning rc=%d\n", |
824 | __func__, resize->last_lba, rc); | |
2cb79266 MO |
825 | return rc; |
826 | } | |
827 | ||
828 | int cxlflash_vlun_resize(struct scsi_device *sdev, | |
829 | struct dk_cxlflash_resize *resize) | |
830 | { | |
831 | return _cxlflash_vlun_resize(sdev, NULL, resize); | |
832 | } | |
833 | ||
834 | /** | |
835 | * cxlflash_restore_luntable() - Restore LUN table to prior state | |
836 | * @cfg: Internal structure associated with the host. | |
837 | */ | |
838 | void cxlflash_restore_luntable(struct cxlflash_cfg *cfg) | |
839 | { | |
840 | struct llun_info *lli, *temp; | |
2cb79266 | 841 | u32 lind; |
8fa4f177 | 842 | int k; |
fb67d44d | 843 | struct device *dev = &cfg->dev->dev; |
0aa14887 | 844 | __be64 __iomem *fc_port_luns; |
2cb79266 MO |
845 | |
846 | mutex_lock(&global.mutex); | |
847 | ||
848 | list_for_each_entry_safe(lli, temp, &cfg->lluns, list) { | |
849 | if (!lli->in_table) | |
850 | continue; | |
851 | ||
852 | lind = lli->lun_index; | |
8fa4f177 | 853 | dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n", __func__, lind); |
2cb79266 | 854 | |
8fa4f177 MO |
855 | for (k = 0; k < cfg->num_fc_ports; k++) |
856 | if (lli->port_sel & (1 << k)) { | |
0aa14887 MO |
857 | fc_port_luns = get_fc_port_luns(cfg, k); |
858 | writeq_be(lli->lun_id[k], &fc_port_luns[lind]); | |
8fa4f177 MO |
859 | dev_dbg(dev, "\t%d=%llx\n", k, lli->lun_id[k]); |
860 | } | |
2cb79266 MO |
861 | } |
862 | ||
863 | mutex_unlock(&global.mutex); | |
864 | } | |
865 | ||
8fa4f177 MO |
866 | /** |
867 | * get_num_ports() - compute number of ports from port selection mask | |
868 | * @psm: Port selection mask. | |
869 | * | |
870 | * Return: Population count of port selection mask | |
871 | */ | |
872 | static inline u8 get_num_ports(u32 psm) | |
873 | { | |
874 | static const u8 bits[16] = { 0, 1, 1, 2, 1, 2, 2, 3, | |
875 | 1, 2, 2, 3, 2, 3, 3, 4 }; | |
876 | ||
877 | return bits[psm & 0xf]; | |
878 | } | |
879 | ||
2cb79266 MO |
880 | /** |
881 | * init_luntable() - write an entry in the LUN table | |
882 | * @cfg: Internal structure associated with the host. | |
883 | * @lli: Per adapter LUN information structure. | |
884 | * | |
8fa4f177 MO |
885 | * On successful return, a LUN table entry is created: |
886 | * - at the top for LUNs visible on multiple ports. | |
887 | * - at the bottom for LUNs visible only on one port. | |
2cb79266 MO |
888 | * |
889 | * Return: 0 on success, -errno on failure | |
890 | */ | |
891 | static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli) | |
892 | { | |
893 | u32 chan; | |
894 | u32 lind; | |
8fa4f177 | 895 | u32 nports; |
2cb79266 | 896 | int rc = 0; |
8fa4f177 | 897 | int k; |
fb67d44d | 898 | struct device *dev = &cfg->dev->dev; |
0aa14887 | 899 | __be64 __iomem *fc_port_luns; |
2cb79266 MO |
900 | |
901 | mutex_lock(&global.mutex); | |
902 | ||
903 | if (lli->in_table) | |
904 | goto out; | |
905 | ||
8fa4f177 MO |
906 | nports = get_num_ports(lli->port_sel); |
907 | if (nports == 0 || nports > cfg->num_fc_ports) { | |
908 | WARN(1, "Unsupported port configuration nports=%u", nports); | |
909 | rc = -EIO; | |
910 | goto out; | |
911 | } | |
912 | ||
913 | if (nports > 1) { | |
2cb79266 | 914 | /* |
8fa4f177 | 915 | * When LUN is visible from multiple ports, we will put |
2cb79266 MO |
916 | * it in the top half of the LUN table. |
917 | */ | |
8fa4f177 MO |
918 | for (k = 0; k < cfg->num_fc_ports; k++) { |
919 | if (!(lli->port_sel & (1 << k))) | |
920 | continue; | |
921 | ||
922 | if (cfg->promote_lun_index == cfg->last_lun_index[k]) { | |
923 | rc = -ENOSPC; | |
924 | goto out; | |
925 | } | |
2cb79266 MO |
926 | } |
927 | ||
928 | lind = lli->lun_index = cfg->promote_lun_index; | |
8fa4f177 MO |
929 | dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n", __func__, lind); |
930 | ||
931 | for (k = 0; k < cfg->num_fc_ports; k++) { | |
932 | if (!(lli->port_sel & (1 << k))) | |
933 | continue; | |
934 | ||
0aa14887 MO |
935 | fc_port_luns = get_fc_port_luns(cfg, k); |
936 | writeq_be(lli->lun_id[k], &fc_port_luns[lind]); | |
8fa4f177 MO |
937 | dev_dbg(dev, "\t%d=%llx\n", k, lli->lun_id[k]); |
938 | } | |
939 | ||
2cb79266 | 940 | cfg->promote_lun_index++; |
2cb79266 MO |
941 | } else { |
942 | /* | |
8fa4f177 | 943 | * When LUN is visible only from one port, we will put |
2cb79266 MO |
944 | * it in the bottom half of the LUN table. |
945 | */ | |
8fa4f177 | 946 | chan = PORTMASK2CHAN(lli->port_sel); |
2cb79266 MO |
947 | if (cfg->promote_lun_index == cfg->last_lun_index[chan]) { |
948 | rc = -ENOSPC; | |
949 | goto out; | |
950 | } | |
951 | ||
952 | lind = lli->lun_index = cfg->last_lun_index[chan]; | |
0aa14887 MO |
953 | fc_port_luns = get_fc_port_luns(cfg, chan); |
954 | writeq_be(lli->lun_id[chan], &fc_port_luns[lind]); | |
2cb79266 | 955 | cfg->last_lun_index[chan]--; |
8fa4f177 | 956 | dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n\t%d=%llx\n", |
fb67d44d | 957 | __func__, lind, chan, lli->lun_id[chan]); |
2cb79266 MO |
958 | } |
959 | ||
960 | lli->in_table = true; | |
961 | out: | |
962 | mutex_unlock(&global.mutex); | |
fb67d44d | 963 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
2cb79266 MO |
964 | return rc; |
965 | } | |
966 | ||
967 | /** | |
968 | * cxlflash_disk_virtual_open() - open a virtual disk of specified size | |
969 | * @sdev: SCSI device associated with LUN owning virtual LUN. | |
970 | * @arg: UVirtual ioctl data structure. | |
971 | * | |
972 | * On successful return, the user is informed of the resource handle | |
f15fbf8d MO |
973 | * to be used to identify the virtual LUN and the size (in blocks) of |
974 | * the virtual LUN in last LBA format. When the size of the virtual LUN | |
2cb79266 MO |
975 | * is zero, the last LBA is reflected as -1. |
976 | * | |
977 | * Return: 0 on success, -errno on failure | |
978 | */ | |
979 | int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg) | |
980 | { | |
fb67d44d | 981 | struct cxlflash_cfg *cfg = shost_priv(sdev->host); |
2cb79266 MO |
982 | struct device *dev = &cfg->dev->dev; |
983 | struct llun_info *lli = sdev->hostdata; | |
984 | struct glun_info *gli = lli->parent; | |
985 | ||
986 | struct dk_cxlflash_uvirtual *virt = (struct dk_cxlflash_uvirtual *)arg; | |
987 | struct dk_cxlflash_resize resize; | |
988 | ||
989 | u64 ctxid = DECODE_CTXID(virt->context_id), | |
990 | rctxid = virt->context_id; | |
991 | u64 lun_size = virt->lun_size; | |
992 | u64 last_lba = 0; | |
993 | u64 rsrc_handle = -1; | |
994 | ||
995 | int rc = 0; | |
996 | ||
997 | struct ctx_info *ctxi = NULL; | |
998 | struct sisl_rht_entry *rhte = NULL; | |
999 | ||
fb67d44d | 1000 | dev_dbg(dev, "%s: ctxid=%llu ls=%llu\n", __func__, ctxid, lun_size); |
2cb79266 | 1001 | |
2843fdbd | 1002 | /* Setup the LUNs block allocator on first call */ |
2cb79266 MO |
1003 | mutex_lock(&gli->mutex); |
1004 | if (gli->mode == MODE_NONE) { | |
2cb79266 MO |
1005 | rc = init_vlun(lli); |
1006 | if (rc) { | |
fb67d44d | 1007 | dev_err(dev, "%s: init_vlun failed rc=%d\n", |
2cb79266 MO |
1008 | __func__, rc); |
1009 | rc = -ENOMEM; | |
1010 | goto err0; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | rc = cxlflash_lun_attach(gli, MODE_VIRTUAL, true); | |
1015 | if (unlikely(rc)) { | |
fb67d44d | 1016 | dev_err(dev, "%s: Failed attach to LUN (VIRTUAL)\n", __func__); |
2cb79266 MO |
1017 | goto err0; |
1018 | } | |
1019 | mutex_unlock(&gli->mutex); | |
1020 | ||
2843fdbd MO |
1021 | rc = init_luntable(cfg, lli); |
1022 | if (rc) { | |
fb67d44d | 1023 | dev_err(dev, "%s: init_luntable failed rc=%d\n", __func__, rc); |
2843fdbd MO |
1024 | goto err1; |
1025 | } | |
1026 | ||
2cb79266 MO |
1027 | ctxi = get_context(cfg, rctxid, lli, 0); |
1028 | if (unlikely(!ctxi)) { | |
fb67d44d | 1029 | dev_err(dev, "%s: Bad context ctxid=%llu\n", __func__, ctxid); |
2cb79266 MO |
1030 | rc = -EINVAL; |
1031 | goto err1; | |
1032 | } | |
1033 | ||
1034 | rhte = rhte_checkout(ctxi, lli); | |
1035 | if (unlikely(!rhte)) { | |
fb67d44d MO |
1036 | dev_err(dev, "%s: too many opens ctxid=%llu\n", |
1037 | __func__, ctxid); | |
2cb79266 MO |
1038 | rc = -EMFILE; /* too many opens */ |
1039 | goto err1; | |
1040 | } | |
1041 | ||
1042 | rsrc_handle = (rhte - ctxi->rht_start); | |
1043 | ||
1044 | /* Populate RHT format 0 */ | |
1045 | rhte->nmask = MC_RHT_NMASK; | |
1046 | rhte->fp = SISL_RHT_FP(0U, ctxi->rht_perms); | |
1047 | ||
1048 | /* Resize even if requested size is 0 */ | |
1049 | marshal_virt_to_resize(virt, &resize); | |
1050 | resize.rsrc_handle = rsrc_handle; | |
1051 | rc = _cxlflash_vlun_resize(sdev, ctxi, &resize); | |
1052 | if (rc) { | |
fb67d44d | 1053 | dev_err(dev, "%s: resize failed rc=%d\n", __func__, rc); |
2cb79266 MO |
1054 | goto err2; |
1055 | } | |
1056 | last_lba = resize.last_lba; | |
1057 | ||
1058 | if (virt->hdr.flags & DK_CXLFLASH_UVIRTUAL_NEED_WRITE_SAME) | |
1059 | ctxi->rht_needs_ws[rsrc_handle] = true; | |
1060 | ||
1061 | virt->hdr.return_flags = 0; | |
1062 | virt->last_lba = last_lba; | |
1063 | virt->rsrc_handle = rsrc_handle; | |
1064 | ||
8fa4f177 | 1065 | if (get_num_ports(lli->port_sel) > 1) |
d5e26bb1 | 1066 | virt->hdr.return_flags |= DK_CXLFLASH_ALL_PORTS_ACTIVE; |
2cb79266 MO |
1067 | out: |
1068 | if (likely(ctxi)) | |
1069 | put_context(ctxi); | |
fb67d44d MO |
1070 | dev_dbg(dev, "%s: returning handle=%llu rc=%d llba=%llu\n", |
1071 | __func__, rsrc_handle, rc, last_lba); | |
2cb79266 MO |
1072 | return rc; |
1073 | ||
1074 | err2: | |
1075 | rhte_checkin(ctxi, rhte); | |
1076 | err1: | |
1077 | cxlflash_lun_detach(gli); | |
1078 | goto out; | |
1079 | err0: | |
1080 | /* Special common cleanup prior to successful LUN attach */ | |
1081 | cxlflash_ba_terminate(&gli->blka.ba_lun); | |
1082 | mutex_unlock(&gli->mutex); | |
1083 | goto out; | |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * clone_lxt() - copies translation tables from source to destination RHTE | |
1088 | * @afu: AFU associated with the host. | |
1089 | * @blka: Block allocator associated with LUN. | |
1090 | * @ctxid: Context ID of context owning the RHTE. | |
1091 | * @rhndl: Resource handle associated with the RHTE. | |
1092 | * @rhte: Destination resource handle entry (RHTE). | |
1093 | * @rhte_src: Source resource handle entry (RHTE). | |
1094 | * | |
1095 | * Return: 0 on success, -errno on failure | |
1096 | */ | |
1097 | static int clone_lxt(struct afu *afu, | |
1098 | struct blka *blka, | |
1099 | ctx_hndl_t ctxid, | |
1100 | res_hndl_t rhndl, | |
1101 | struct sisl_rht_entry *rhte, | |
1102 | struct sisl_rht_entry *rhte_src) | |
1103 | { | |
fb67d44d MO |
1104 | struct cxlflash_cfg *cfg = afu->parent; |
1105 | struct device *dev = &cfg->dev->dev; | |
c2c292f4 UK |
1106 | struct sisl_lxt_entry *lxt = NULL; |
1107 | bool locked = false; | |
2cb79266 MO |
1108 | u32 ngrps; |
1109 | u64 aun; /* chunk# allocated by block allocator */ | |
c2c292f4 UK |
1110 | int j; |
1111 | int i = 0; | |
1112 | int rc = 0; | |
2cb79266 MO |
1113 | |
1114 | ngrps = LXT_NUM_GROUPS(rhte_src->lxt_cnt); | |
1115 | ||
1116 | if (ngrps) { | |
1117 | /* allocate new LXTs for clone */ | |
1118 | lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), | |
1119 | GFP_KERNEL); | |
c2c292f4 UK |
1120 | if (unlikely(!lxt)) { |
1121 | rc = -ENOMEM; | |
1122 | goto out; | |
1123 | } | |
2cb79266 MO |
1124 | |
1125 | /* copy over */ | |
1126 | memcpy(lxt, rhte_src->lxt_start, | |
1127 | (sizeof(*lxt) * rhte_src->lxt_cnt)); | |
1128 | ||
c2c292f4 UK |
1129 | /* clone the LBAs in block allocator via ref_cnt, note that the |
1130 | * block allocator mutex must be held until it is established | |
1131 | * that this routine will complete without the need for a | |
1132 | * cleanup. | |
1133 | */ | |
2cb79266 | 1134 | mutex_lock(&blka->mutex); |
c2c292f4 | 1135 | locked = true; |
2cb79266 MO |
1136 | for (i = 0; i < rhte_src->lxt_cnt; i++) { |
1137 | aun = (lxt[i].rlba_base >> MC_CHUNK_SHIFT); | |
1138 | if (ba_clone(&blka->ba_lun, aun) == -1ULL) { | |
c2c292f4 UK |
1139 | rc = -EIO; |
1140 | goto err; | |
2cb79266 MO |
1141 | } |
1142 | } | |
2cb79266 MO |
1143 | } |
1144 | ||
1145 | /* | |
1146 | * The following sequence is prescribed in the SISlite spec | |
1147 | * for syncing up with the AFU when adding LXT entries. | |
1148 | */ | |
1149 | dma_wmb(); /* Make LXT updates are visible */ | |
1150 | ||
1151 | rhte->lxt_start = lxt; | |
1152 | dma_wmb(); /* Make RHT entry's LXT table update visible */ | |
1153 | ||
1154 | rhte->lxt_cnt = rhte_src->lxt_cnt; | |
1155 | dma_wmb(); /* Make RHT entry's LXT table size update visible */ | |
1156 | ||
c2c292f4 UK |
1157 | rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC); |
1158 | if (unlikely(rc)) { | |
1159 | rc = -EAGAIN; | |
1160 | goto err2; | |
1161 | } | |
2cb79266 | 1162 | |
c2c292f4 UK |
1163 | out: |
1164 | if (locked) | |
1165 | mutex_unlock(&blka->mutex); | |
1166 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
1167 | return rc; | |
1168 | err2: | |
1169 | /* Reset the RHTE */ | |
1170 | rhte->lxt_cnt = 0; | |
1171 | dma_wmb(); | |
1172 | rhte->lxt_start = NULL; | |
1173 | dma_wmb(); | |
1174 | err: | |
1175 | /* free the clones already made */ | |
1176 | for (j = 0; j < i; j++) { | |
1177 | aun = (lxt[j].rlba_base >> MC_CHUNK_SHIFT); | |
1178 | ba_free(&blka->ba_lun, aun); | |
1179 | } | |
1180 | kfree(lxt); | |
1181 | goto out; | |
2cb79266 MO |
1182 | } |
1183 | ||
1184 | /** | |
1185 | * cxlflash_disk_clone() - clone a context by making snapshot of another | |
1186 | * @sdev: SCSI device associated with LUN owning virtual LUN. | |
1187 | * @clone: Clone ioctl data structure. | |
1188 | * | |
1189 | * This routine effectively performs cxlflash_disk_open operation for each | |
1190 | * in-use virtual resource in the source context. Note that the destination | |
1191 | * context must be in pristine state and cannot have any resource handles | |
1192 | * open at the time of the clone. | |
1193 | * | |
1194 | * Return: 0 on success, -errno on failure | |
1195 | */ | |
1196 | int cxlflash_disk_clone(struct scsi_device *sdev, | |
1197 | struct dk_cxlflash_clone *clone) | |
1198 | { | |
fb67d44d MO |
1199 | struct cxlflash_cfg *cfg = shost_priv(sdev->host); |
1200 | struct device *dev = &cfg->dev->dev; | |
2cb79266 MO |
1201 | struct llun_info *lli = sdev->hostdata; |
1202 | struct glun_info *gli = lli->parent; | |
1203 | struct blka *blka = &gli->blka; | |
1204 | struct afu *afu = cfg->afu; | |
1205 | struct dk_cxlflash_release release = { { 0 }, 0 }; | |
1206 | ||
1207 | struct ctx_info *ctxi_src = NULL, | |
1208 | *ctxi_dst = NULL; | |
1209 | struct lun_access *lun_access_src, *lun_access_dst; | |
1210 | u32 perms; | |
1211 | u64 ctxid_src = DECODE_CTXID(clone->context_id_src), | |
1212 | ctxid_dst = DECODE_CTXID(clone->context_id_dst), | |
1213 | rctxid_src = clone->context_id_src, | |
1214 | rctxid_dst = clone->context_id_dst; | |
2cb79266 MO |
1215 | int i, j; |
1216 | int rc = 0; | |
1217 | bool found; | |
1218 | LIST_HEAD(sidecar); | |
1219 | ||
fb67d44d MO |
1220 | dev_dbg(dev, "%s: ctxid_src=%llu ctxid_dst=%llu\n", |
1221 | __func__, ctxid_src, ctxid_dst); | |
2cb79266 MO |
1222 | |
1223 | /* Do not clone yourself */ | |
1224 | if (unlikely(rctxid_src == rctxid_dst)) { | |
1225 | rc = -EINVAL; | |
1226 | goto out; | |
1227 | } | |
1228 | ||
1229 | if (unlikely(gli->mode != MODE_VIRTUAL)) { | |
1230 | rc = -EINVAL; | |
fb67d44d MO |
1231 | dev_dbg(dev, "%s: Only supported on virtual LUNs mode=%u\n", |
1232 | __func__, gli->mode); | |
2cb79266 MO |
1233 | goto out; |
1234 | } | |
1235 | ||
1236 | ctxi_src = get_context(cfg, rctxid_src, lli, CTX_CTRL_CLONE); | |
1237 | ctxi_dst = get_context(cfg, rctxid_dst, lli, 0); | |
1238 | if (unlikely(!ctxi_src || !ctxi_dst)) { | |
fb67d44d MO |
1239 | dev_dbg(dev, "%s: Bad context ctxid_src=%llu ctxid_dst=%llu\n", |
1240 | __func__, ctxid_src, ctxid_dst); | |
2cb79266 MO |
1241 | rc = -EINVAL; |
1242 | goto out; | |
1243 | } | |
1244 | ||
2cb79266 MO |
1245 | /* Verify there is no open resource handle in the destination context */ |
1246 | for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) | |
1247 | if (ctxi_dst->rht_start[i].nmask != 0) { | |
1248 | rc = -EINVAL; | |
1249 | goto out; | |
1250 | } | |
1251 | ||
1252 | /* Clone LUN access list */ | |
1253 | list_for_each_entry(lun_access_src, &ctxi_src->luns, list) { | |
1254 | found = false; | |
1255 | list_for_each_entry(lun_access_dst, &ctxi_dst->luns, list) | |
1256 | if (lun_access_dst->sdev == lun_access_src->sdev) { | |
1257 | found = true; | |
1258 | break; | |
1259 | } | |
1260 | ||
1261 | if (!found) { | |
1262 | lun_access_dst = kzalloc(sizeof(*lun_access_dst), | |
1263 | GFP_KERNEL); | |
1264 | if (unlikely(!lun_access_dst)) { | |
fb67d44d MO |
1265 | dev_err(dev, "%s: lun_access allocation fail\n", |
1266 | __func__); | |
2cb79266 MO |
1267 | rc = -ENOMEM; |
1268 | goto out; | |
1269 | } | |
1270 | ||
1271 | *lun_access_dst = *lun_access_src; | |
1272 | list_add(&lun_access_dst->list, &sidecar); | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | if (unlikely(!ctxi_src->rht_out)) { | |
fb67d44d | 1277 | dev_dbg(dev, "%s: Nothing to clone\n", __func__); |
2cb79266 MO |
1278 | goto out_success; |
1279 | } | |
1280 | ||
1281 | /* User specified permission on attach */ | |
1282 | perms = ctxi_dst->rht_perms; | |
1283 | ||
1284 | /* | |
1285 | * Copy over checked-out RHT (and their associated LXT) entries by | |
1286 | * hand, stopping after we've copied all outstanding entries and | |
1287 | * cleaning up if the clone fails. | |
1288 | * | |
1289 | * Note: This loop is equivalent to performing cxlflash_disk_open and | |
1290 | * cxlflash_vlun_resize. As such, LUN accounting needs to be taken into | |
1291 | * account by attaching after each successful RHT entry clone. In the | |
1292 | * event that a clone failure is experienced, the LUN detach is handled | |
1293 | * via the cleanup performed by _cxlflash_disk_release. | |
1294 | */ | |
1295 | for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) { | |
1296 | if (ctxi_src->rht_out == ctxi_dst->rht_out) | |
1297 | break; | |
1298 | if (ctxi_src->rht_start[i].nmask == 0) | |
1299 | continue; | |
1300 | ||
1301 | /* Consume a destination RHT entry */ | |
1302 | ctxi_dst->rht_out++; | |
1303 | ctxi_dst->rht_start[i].nmask = ctxi_src->rht_start[i].nmask; | |
1304 | ctxi_dst->rht_start[i].fp = | |
1305 | SISL_RHT_FP_CLONE(ctxi_src->rht_start[i].fp, perms); | |
1306 | ctxi_dst->rht_lun[i] = ctxi_src->rht_lun[i]; | |
1307 | ||
1308 | rc = clone_lxt(afu, blka, ctxid_dst, i, | |
1309 | &ctxi_dst->rht_start[i], | |
1310 | &ctxi_src->rht_start[i]); | |
1311 | if (rc) { | |
1312 | marshal_clone_to_rele(clone, &release); | |
1313 | for (j = 0; j < i; j++) { | |
1314 | release.rsrc_handle = j; | |
1315 | _cxlflash_disk_release(sdev, ctxi_dst, | |
1316 | &release); | |
1317 | } | |
1318 | ||
1319 | /* Put back the one we failed on */ | |
1320 | rhte_checkin(ctxi_dst, &ctxi_dst->rht_start[i]); | |
1321 | goto err; | |
1322 | } | |
1323 | ||
1324 | cxlflash_lun_attach(gli, gli->mode, false); | |
1325 | } | |
1326 | ||
1327 | out_success: | |
1328 | list_splice(&sidecar, &ctxi_dst->luns); | |
2cb79266 MO |
1329 | |
1330 | /* fall through */ | |
1331 | out: | |
1332 | if (ctxi_src) | |
1333 | put_context(ctxi_src); | |
1334 | if (ctxi_dst) | |
1335 | put_context(ctxi_dst); | |
fb67d44d | 1336 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
2cb79266 MO |
1337 | return rc; |
1338 | ||
1339 | err: | |
1340 | list_for_each_entry_safe(lun_access_src, lun_access_dst, &sidecar, list) | |
1341 | kfree(lun_access_src); | |
1342 | goto out; | |
1343 | } |