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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
4 * Copyright (C) 2016 CNEX Labs
5 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
6 * Matias Bjorling <matias@cnexlabs.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * Implementation of a physical block-device target for Open-channel SSDs.
18 *
19 * pblk-init.c - pblk's initialization.
20 */
21
22#include "pblk.h"
23#include "pblk-trace.h"
24
25static unsigned int write_buffer_size;
26
27module_param(write_buffer_size, uint, 0644);
28MODULE_PARM_DESC(write_buffer_size, "number of entries in a write buffer");
29
30struct pblk_global_caches {
31 struct kmem_cache *ws;
32 struct kmem_cache *rec;
33 struct kmem_cache *g_rq;
34 struct kmem_cache *w_rq;
35
36 struct kref kref;
37
38 struct mutex mutex; /* Ensures consistency between
39 * caches and kref
40 */
41};
42
43static struct pblk_global_caches pblk_caches = {
44 .mutex = __MUTEX_INITIALIZER(pblk_caches.mutex),
45 .kref = KREF_INIT(0),
46};
47
48struct bio_set pblk_bio_set;
49
50static blk_qc_t pblk_submit_bio(struct bio *bio)
51{
52 struct pblk *pblk = bio->bi_disk->queue->queuedata;
53
54 if (bio_op(bio) == REQ_OP_DISCARD) {
55 pblk_discard(pblk, bio);
56 if (!(bio->bi_opf & REQ_PREFLUSH)) {
57 bio_endio(bio);
58 return BLK_QC_T_NONE;
59 }
60 }
61
62 /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
63 * constraint. Writes can be of arbitrary size.
64 */
65 if (bio_data_dir(bio) == READ) {
66 blk_queue_split(&bio);
67 pblk_submit_read(pblk, bio);
68 } else {
69 /* Prevent deadlock in the case of a modest LUN configuration
70 * and large user I/Os. Unless stalled, the rate limiter
71 * leaves at least 256KB available for user I/O.
72 */
73 if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
74 blk_queue_split(&bio);
75
76 pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
77 }
78
79 return BLK_QC_T_NONE;
80}
81
82static const struct block_device_operations pblk_bops = {
83 .owner = THIS_MODULE,
84 .submit_bio = pblk_submit_bio,
85};
86
87
88static size_t pblk_trans_map_size(struct pblk *pblk)
89{
90 int entry_size = 8;
91
92 if (pblk->addrf_len < 32)
93 entry_size = 4;
94
95 return entry_size * pblk->capacity;
96}
97
98#ifdef CONFIG_NVM_PBLK_DEBUG
99static u32 pblk_l2p_crc(struct pblk *pblk)
100{
101 size_t map_size;
102 u32 crc = ~(u32)0;
103
104 map_size = pblk_trans_map_size(pblk);
105 crc = crc32_le(crc, pblk->trans_map, map_size);
106 return crc;
107}
108#endif
109
110static void pblk_l2p_free(struct pblk *pblk)
111{
112 vfree(pblk->trans_map);
113}
114
115static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
116{
117 struct pblk_line *line = NULL;
118
119 if (factory_init) {
120 guid_gen(&pblk->instance_uuid);
121 } else {
122 line = pblk_recov_l2p(pblk);
123 if (IS_ERR(line)) {
124 pblk_err(pblk, "could not recover l2p table\n");
125 return -EFAULT;
126 }
127 }
128
129#ifdef CONFIG_NVM_PBLK_DEBUG
130 pblk_info(pblk, "init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
131#endif
132
133 /* Free full lines directly as GC has not been started yet */
134 pblk_gc_free_full_lines(pblk);
135
136 if (!line) {
137 /* Configure next line for user data */
138 line = pblk_line_get_first_data(pblk);
139 if (!line)
140 return -EFAULT;
141 }
142
143 return 0;
144}
145
146static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
147{
148 sector_t i;
149 struct ppa_addr ppa;
150 size_t map_size;
151 int ret = 0;
152
153 map_size = pblk_trans_map_size(pblk);
154 pblk->trans_map = __vmalloc(map_size, GFP_KERNEL | __GFP_NOWARN |
155 __GFP_RETRY_MAYFAIL | __GFP_HIGHMEM);
156 if (!pblk->trans_map) {
157 pblk_err(pblk, "failed to allocate L2P (need %zu of memory)\n",
158 map_size);
159 return -ENOMEM;
160 }
161
162 pblk_ppa_set_empty(&ppa);
163
164 for (i = 0; i < pblk->capacity; i++)
165 pblk_trans_map_set(pblk, i, ppa);
166
167 ret = pblk_l2p_recover(pblk, factory_init);
168 if (ret)
169 vfree(pblk->trans_map);
170
171 return ret;
172}
173
174static void pblk_rwb_free(struct pblk *pblk)
175{
176 if (pblk_rb_tear_down_check(&pblk->rwb))
177 pblk_err(pblk, "write buffer error on tear down\n");
178
179 pblk_rb_free(&pblk->rwb);
180}
181
182static int pblk_rwb_init(struct pblk *pblk)
183{
184 struct nvm_tgt_dev *dev = pblk->dev;
185 struct nvm_geo *geo = &dev->geo;
186 unsigned long buffer_size;
187 int pgs_in_buffer, threshold;
188
189 threshold = geo->mw_cunits * geo->all_luns;
190 pgs_in_buffer = (max(geo->mw_cunits, geo->ws_opt) + geo->ws_opt)
191 * geo->all_luns;
192
193 if (write_buffer_size && (write_buffer_size > pgs_in_buffer))
194 buffer_size = write_buffer_size;
195 else
196 buffer_size = pgs_in_buffer;
197
198 return pblk_rb_init(&pblk->rwb, buffer_size, threshold, geo->csecs);
199}
200
201static int pblk_set_addrf_12(struct pblk *pblk, struct nvm_geo *geo,
202 struct nvm_addrf_12 *dst)
203{
204 struct nvm_addrf_12 *src = (struct nvm_addrf_12 *)&geo->addrf;
205 int power_len;
206
207 /* Re-calculate channel and lun format to adapt to configuration */
208 power_len = get_count_order(geo->num_ch);
209 if (1 << power_len != geo->num_ch) {
210 pblk_err(pblk, "supports only power-of-two channel config.\n");
211 return -EINVAL;
212 }
213 dst->ch_len = power_len;
214
215 power_len = get_count_order(geo->num_lun);
216 if (1 << power_len != geo->num_lun) {
217 pblk_err(pblk, "supports only power-of-two LUN config.\n");
218 return -EINVAL;
219 }
220 dst->lun_len = power_len;
221
222 dst->blk_len = src->blk_len;
223 dst->pg_len = src->pg_len;
224 dst->pln_len = src->pln_len;
225 dst->sec_len = src->sec_len;
226
227 dst->sec_offset = 0;
228 dst->pln_offset = dst->sec_len;
229 dst->ch_offset = dst->pln_offset + dst->pln_len;
230 dst->lun_offset = dst->ch_offset + dst->ch_len;
231 dst->pg_offset = dst->lun_offset + dst->lun_len;
232 dst->blk_offset = dst->pg_offset + dst->pg_len;
233
234 dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
235 dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
236 dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
237 dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
238 dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
239 dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;
240
241 return dst->blk_offset + src->blk_len;
242}
243
244static int pblk_set_addrf_20(struct nvm_geo *geo, struct nvm_addrf *adst,
245 struct pblk_addrf *udst)
246{
247 struct nvm_addrf *src = &geo->addrf;
248
249 adst->ch_len = get_count_order(geo->num_ch);
250 adst->lun_len = get_count_order(geo->num_lun);
251 adst->chk_len = src->chk_len;
252 adst->sec_len = src->sec_len;
253
254 adst->sec_offset = 0;
255 adst->ch_offset = adst->sec_len;
256 adst->lun_offset = adst->ch_offset + adst->ch_len;
257 adst->chk_offset = adst->lun_offset + adst->lun_len;
258
259 adst->sec_mask = ((1ULL << adst->sec_len) - 1) << adst->sec_offset;
260 adst->chk_mask = ((1ULL << adst->chk_len) - 1) << adst->chk_offset;
261 adst->lun_mask = ((1ULL << adst->lun_len) - 1) << adst->lun_offset;
262 adst->ch_mask = ((1ULL << adst->ch_len) - 1) << adst->ch_offset;
263
264 udst->sec_stripe = geo->ws_opt;
265 udst->ch_stripe = geo->num_ch;
266 udst->lun_stripe = geo->num_lun;
267
268 udst->sec_lun_stripe = udst->sec_stripe * udst->ch_stripe;
269 udst->sec_ws_stripe = udst->sec_lun_stripe * udst->lun_stripe;
270
271 return adst->chk_offset + adst->chk_len;
272}
273
274static int pblk_set_addrf(struct pblk *pblk)
275{
276 struct nvm_tgt_dev *dev = pblk->dev;
277 struct nvm_geo *geo = &dev->geo;
278 int mod;
279
280 switch (geo->version) {
281 case NVM_OCSSD_SPEC_12:
282 div_u64_rem(geo->clba, pblk->min_write_pgs, &mod);
283 if (mod) {
284 pblk_err(pblk, "bad configuration of sectors/pages\n");
285 return -EINVAL;
286 }
287
288 pblk->addrf_len = pblk_set_addrf_12(pblk, geo,
289 (void *)&pblk->addrf);
290 break;
291 case NVM_OCSSD_SPEC_20:
292 pblk->addrf_len = pblk_set_addrf_20(geo, (void *)&pblk->addrf,
293 &pblk->uaddrf);
294 break;
295 default:
296 pblk_err(pblk, "OCSSD revision not supported (%d)\n",
297 geo->version);
298 return -EINVAL;
299 }
300
301 return 0;
302}
303
304static int pblk_create_global_caches(void)
305{
306
307 pblk_caches.ws = kmem_cache_create("pblk_blk_ws",
308 sizeof(struct pblk_line_ws), 0, 0, NULL);
309 if (!pblk_caches.ws)
310 return -ENOMEM;
311
312 pblk_caches.rec = kmem_cache_create("pblk_rec",
313 sizeof(struct pblk_rec_ctx), 0, 0, NULL);
314 if (!pblk_caches.rec)
315 goto fail_destroy_ws;
316
317 pblk_caches.g_rq = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
318 0, 0, NULL);
319 if (!pblk_caches.g_rq)
320 goto fail_destroy_rec;
321
322 pblk_caches.w_rq = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
323 0, 0, NULL);
324 if (!pblk_caches.w_rq)
325 goto fail_destroy_g_rq;
326
327 return 0;
328
329fail_destroy_g_rq:
330 kmem_cache_destroy(pblk_caches.g_rq);
331fail_destroy_rec:
332 kmem_cache_destroy(pblk_caches.rec);
333fail_destroy_ws:
334 kmem_cache_destroy(pblk_caches.ws);
335
336 return -ENOMEM;
337}
338
339static int pblk_get_global_caches(void)
340{
341 int ret = 0;
342
343 mutex_lock(&pblk_caches.mutex);
344
345 if (kref_get_unless_zero(&pblk_caches.kref))
346 goto out;
347
348 ret = pblk_create_global_caches();
349 if (!ret)
350 kref_init(&pblk_caches.kref);
351
352out:
353 mutex_unlock(&pblk_caches.mutex);
354 return ret;
355}
356
357static void pblk_destroy_global_caches(struct kref *ref)
358{
359 struct pblk_global_caches *c;
360
361 c = container_of(ref, struct pblk_global_caches, kref);
362
363 kmem_cache_destroy(c->ws);
364 kmem_cache_destroy(c->rec);
365 kmem_cache_destroy(c->g_rq);
366 kmem_cache_destroy(c->w_rq);
367}
368
369static void pblk_put_global_caches(void)
370{
371 mutex_lock(&pblk_caches.mutex);
372 kref_put(&pblk_caches.kref, pblk_destroy_global_caches);
373 mutex_unlock(&pblk_caches.mutex);
374}
375
376static int pblk_core_init(struct pblk *pblk)
377{
378 struct nvm_tgt_dev *dev = pblk->dev;
379 struct nvm_geo *geo = &dev->geo;
380 int ret, max_write_ppas;
381
382 atomic64_set(&pblk->user_wa, 0);
383 atomic64_set(&pblk->pad_wa, 0);
384 atomic64_set(&pblk->gc_wa, 0);
385 pblk->user_rst_wa = 0;
386 pblk->pad_rst_wa = 0;
387 pblk->gc_rst_wa = 0;
388
389 atomic64_set(&pblk->nr_flush, 0);
390 pblk->nr_flush_rst = 0;
391
392 pblk->min_write_pgs = geo->ws_opt;
393 pblk->min_write_pgs_data = pblk->min_write_pgs;
394 max_write_ppas = pblk->min_write_pgs * geo->all_luns;
395 pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
396 pblk->max_write_pgs = min_t(int, pblk->max_write_pgs,
397 queue_max_hw_sectors(dev->q) / (geo->csecs >> SECTOR_SHIFT));
398 pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
399
400 pblk->oob_meta_size = geo->sos;
401 if (!pblk_is_oob_meta_supported(pblk)) {
402 /* For drives which does not have OOB metadata feature
403 * in order to support recovery feature we need to use
404 * so called packed metadata. Packed metada will store
405 * the same information as OOB metadata (l2p table mapping,
406 * but in the form of the single page at the end of
407 * every write request.
408 */
409 if (pblk->min_write_pgs
410 * sizeof(struct pblk_sec_meta) > PAGE_SIZE) {
411 /* We want to keep all the packed metadata on single
412 * page per write requests. So we need to ensure that
413 * it will fit.
414 *
415 * This is more like sanity check, since there is
416 * no device with such a big minimal write size
417 * (above 1 metabytes).
418 */
419 pblk_err(pblk, "Not supported min write size\n");
420 return -EINVAL;
421 }
422 /* For packed meta approach we do some simplification.
423 * On read path we always issue requests which size
424 * equal to max_write_pgs, with all pages filled with
425 * user payload except of last one page which will be
426 * filled with packed metadata.
427 */
428 pblk->max_write_pgs = pblk->min_write_pgs;
429 pblk->min_write_pgs_data = pblk->min_write_pgs - 1;
430 }
431
432 pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t),
433 GFP_KERNEL);
434 if (!pblk->pad_dist)
435 return -ENOMEM;
436
437 if (pblk_get_global_caches())
438 goto fail_free_pad_dist;
439
440 /* Internal bios can be at most the sectors signaled by the device. */
441 ret = mempool_init_page_pool(&pblk->page_bio_pool, NVM_MAX_VLBA, 0);
442 if (ret)
443 goto free_global_caches;
444
445 ret = mempool_init_slab_pool(&pblk->gen_ws_pool, PBLK_GEN_WS_POOL_SIZE,
446 pblk_caches.ws);
447 if (ret)
448 goto free_page_bio_pool;
449
450 ret = mempool_init_slab_pool(&pblk->rec_pool, geo->all_luns,
451 pblk_caches.rec);
452 if (ret)
453 goto free_gen_ws_pool;
454
455 ret = mempool_init_slab_pool(&pblk->r_rq_pool, geo->all_luns,
456 pblk_caches.g_rq);
457 if (ret)
458 goto free_rec_pool;
459
460 ret = mempool_init_slab_pool(&pblk->e_rq_pool, geo->all_luns,
461 pblk_caches.g_rq);
462 if (ret)
463 goto free_r_rq_pool;
464
465 ret = mempool_init_slab_pool(&pblk->w_rq_pool, geo->all_luns,
466 pblk_caches.w_rq);
467 if (ret)
468 goto free_e_rq_pool;
469
470 pblk->close_wq = alloc_workqueue("pblk-close-wq",
471 WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
472 if (!pblk->close_wq)
473 goto free_w_rq_pool;
474
475 pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
476 WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
477 if (!pblk->bb_wq)
478 goto free_close_wq;
479
480 pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
481 WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
482 if (!pblk->r_end_wq)
483 goto free_bb_wq;
484
485 if (pblk_set_addrf(pblk))
486 goto free_r_end_wq;
487
488 INIT_LIST_HEAD(&pblk->compl_list);
489 INIT_LIST_HEAD(&pblk->resubmit_list);
490
491 return 0;
492
493free_r_end_wq:
494 destroy_workqueue(pblk->r_end_wq);
495free_bb_wq:
496 destroy_workqueue(pblk->bb_wq);
497free_close_wq:
498 destroy_workqueue(pblk->close_wq);
499free_w_rq_pool:
500 mempool_exit(&pblk->w_rq_pool);
501free_e_rq_pool:
502 mempool_exit(&pblk->e_rq_pool);
503free_r_rq_pool:
504 mempool_exit(&pblk->r_rq_pool);
505free_rec_pool:
506 mempool_exit(&pblk->rec_pool);
507free_gen_ws_pool:
508 mempool_exit(&pblk->gen_ws_pool);
509free_page_bio_pool:
510 mempool_exit(&pblk->page_bio_pool);
511free_global_caches:
512 pblk_put_global_caches();
513fail_free_pad_dist:
514 kfree(pblk->pad_dist);
515 return -ENOMEM;
516}
517
518static void pblk_core_free(struct pblk *pblk)
519{
520 if (pblk->close_wq)
521 destroy_workqueue(pblk->close_wq);
522
523 if (pblk->r_end_wq)
524 destroy_workqueue(pblk->r_end_wq);
525
526 if (pblk->bb_wq)
527 destroy_workqueue(pblk->bb_wq);
528
529 mempool_exit(&pblk->page_bio_pool);
530 mempool_exit(&pblk->gen_ws_pool);
531 mempool_exit(&pblk->rec_pool);
532 mempool_exit(&pblk->r_rq_pool);
533 mempool_exit(&pblk->e_rq_pool);
534 mempool_exit(&pblk->w_rq_pool);
535
536 pblk_put_global_caches();
537 kfree(pblk->pad_dist);
538}
539
540static void pblk_line_mg_free(struct pblk *pblk)
541{
542 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
543 int i;
544
545 kfree(l_mg->bb_template);
546 kfree(l_mg->bb_aux);
547 kfree(l_mg->vsc_list);
548
549 for (i = 0; i < PBLK_DATA_LINES; i++) {
550 kfree(l_mg->sline_meta[i]);
551 kvfree(l_mg->eline_meta[i]->buf);
552 kfree(l_mg->eline_meta[i]);
553 }
554
555 mempool_destroy(l_mg->bitmap_pool);
556 kmem_cache_destroy(l_mg->bitmap_cache);
557}
558
559static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
560 struct pblk_line *line)
561{
562 struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
563
564 kfree(line->blk_bitmap);
565 kfree(line->erase_bitmap);
566 kfree(line->chks);
567
568 kvfree(w_err_gc->lba_list);
569 kfree(w_err_gc);
570}
571
572static void pblk_lines_free(struct pblk *pblk)
573{
574 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
575 struct pblk_line *line;
576 int i;
577
578 for (i = 0; i < l_mg->nr_lines; i++) {
579 line = &pblk->lines[i];
580
581 pblk_line_free(line);
582 pblk_line_meta_free(l_mg, line);
583 }
584
585 pblk_line_mg_free(pblk);
586
587 kfree(pblk->luns);
588 kfree(pblk->lines);
589}
590
591static int pblk_luns_init(struct pblk *pblk)
592{
593 struct nvm_tgt_dev *dev = pblk->dev;
594 struct nvm_geo *geo = &dev->geo;
595 struct pblk_lun *rlun;
596 int i;
597
598 /* TODO: Implement unbalanced LUN support */
599 if (geo->num_lun < 0) {
600 pblk_err(pblk, "unbalanced LUN config.\n");
601 return -EINVAL;
602 }
603
604 pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
605 GFP_KERNEL);
606 if (!pblk->luns)
607 return -ENOMEM;
608
609 for (i = 0; i < geo->all_luns; i++) {
610 /* Stripe across channels */
611 int ch = i % geo->num_ch;
612 int lun_raw = i / geo->num_ch;
613 int lunid = lun_raw + ch * geo->num_lun;
614
615 rlun = &pblk->luns[i];
616 rlun->bppa = dev->luns[lunid];
617
618 sema_init(&rlun->wr_sem, 1);
619 }
620
621 return 0;
622}
623
624/* See comment over struct line_emeta definition */
625static unsigned int calc_emeta_len(struct pblk *pblk)
626{
627 struct pblk_line_meta *lm = &pblk->lm;
628 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
629 struct nvm_tgt_dev *dev = pblk->dev;
630 struct nvm_geo *geo = &dev->geo;
631
632 /* Round to sector size so that lba_list starts on its own sector */
633 lm->emeta_sec[1] = DIV_ROUND_UP(
634 sizeof(struct line_emeta) + lm->blk_bitmap_len +
635 sizeof(struct wa_counters), geo->csecs);
636 lm->emeta_len[1] = lm->emeta_sec[1] * geo->csecs;
637
638 /* Round to sector size so that vsc_list starts on its own sector */
639 lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
640 lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
641 geo->csecs);
642 lm->emeta_len[2] = lm->emeta_sec[2] * geo->csecs;
643
644 lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
645 geo->csecs);
646 lm->emeta_len[3] = lm->emeta_sec[3] * geo->csecs;
647
648 lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);
649
650 return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
651}
652
653static int pblk_set_provision(struct pblk *pblk, int nr_free_chks)
654{
655 struct nvm_tgt_dev *dev = pblk->dev;
656 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
657 struct pblk_line_meta *lm = &pblk->lm;
658 struct nvm_geo *geo = &dev->geo;
659 sector_t provisioned;
660 int sec_meta, blk_meta, clba;
661 int minimum;
662
663 if (geo->op == NVM_TARGET_DEFAULT_OP)
664 pblk->op = PBLK_DEFAULT_OP;
665 else
666 pblk->op = geo->op;
667
668 minimum = pblk_get_min_chks(pblk);
669 provisioned = nr_free_chks;
670 provisioned *= (100 - pblk->op);
671 sector_div(provisioned, 100);
672
673 if ((nr_free_chks - provisioned) < minimum) {
674 if (geo->op != NVM_TARGET_DEFAULT_OP) {
675 pblk_err(pblk, "OP too small to create a sane instance\n");
676 return -EINTR;
677 }
678
679 /* If the user did not specify an OP value, and PBLK_DEFAULT_OP
680 * is not enough, calculate and set sane value
681 */
682
683 provisioned = nr_free_chks - minimum;
684 pblk->op = (100 * minimum) / nr_free_chks;
685 pblk_info(pblk, "Default OP insufficient, adjusting OP to %d\n",
686 pblk->op);
687 }
688
689 pblk->op_blks = nr_free_chks - provisioned;
690
691 /* Internally pblk manages all free blocks, but all calculations based
692 * on user capacity consider only provisioned blocks
693 */
694 pblk->rl.total_blocks = nr_free_chks;
695
696 /* Consider sectors used for metadata */
697 sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
698 blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);
699
700 clba = (geo->clba / pblk->min_write_pgs) * pblk->min_write_pgs_data;
701 pblk->capacity = (provisioned - blk_meta) * clba;
702
703 atomic_set(&pblk->rl.free_blocks, nr_free_chks);
704 atomic_set(&pblk->rl.free_user_blocks, nr_free_chks);
705
706 return 0;
707}
708
709static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
710 struct nvm_chk_meta *meta)
711{
712 struct nvm_tgt_dev *dev = pblk->dev;
713 struct nvm_geo *geo = &dev->geo;
714 struct pblk_line_meta *lm = &pblk->lm;
715 int i, nr_bad_chks = 0;
716
717 for (i = 0; i < lm->blk_per_line; i++) {
718 struct pblk_lun *rlun = &pblk->luns[i];
719 struct nvm_chk_meta *chunk;
720 struct nvm_chk_meta *chunk_meta;
721 struct ppa_addr ppa;
722 int pos;
723
724 ppa = rlun->bppa;
725 pos = pblk_ppa_to_pos(geo, ppa);
726 chunk = &line->chks[pos];
727
728 ppa.m.chk = line->id;
729 chunk_meta = pblk_chunk_get_off(pblk, meta, ppa);
730
731 chunk->state = chunk_meta->state;
732 chunk->type = chunk_meta->type;
733 chunk->wi = chunk_meta->wi;
734 chunk->slba = chunk_meta->slba;
735 chunk->cnlb = chunk_meta->cnlb;
736 chunk->wp = chunk_meta->wp;
737
738 trace_pblk_chunk_state(pblk_disk_name(pblk), &ppa,
739 chunk->state);
740
741 if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
742 WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
743 continue;
744 }
745
746 if (!(chunk->state & NVM_CHK_ST_OFFLINE))
747 continue;
748
749 set_bit(pos, line->blk_bitmap);
750 nr_bad_chks++;
751 }
752
753 return nr_bad_chks;
754}
755
756static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
757 void *chunk_meta, int line_id)
758{
759 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
760 struct pblk_line_meta *lm = &pblk->lm;
761 long nr_bad_chks, chk_in_line;
762
763 line->pblk = pblk;
764 line->id = line_id;
765 line->type = PBLK_LINETYPE_FREE;
766 line->state = PBLK_LINESTATE_NEW;
767 line->gc_group = PBLK_LINEGC_NONE;
768 line->vsc = &l_mg->vsc_list[line_id];
769 spin_lock_init(&line->lock);
770
771 nr_bad_chks = pblk_setup_line_meta_chk(pblk, line, chunk_meta);
772
773 chk_in_line = lm->blk_per_line - nr_bad_chks;
774 if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
775 chk_in_line < lm->min_blk_line) {
776 line->state = PBLK_LINESTATE_BAD;
777 list_add_tail(&line->list, &l_mg->bad_list);
778 return 0;
779 }
780
781 atomic_set(&line->blk_in_line, chk_in_line);
782 list_add_tail(&line->list, &l_mg->free_list);
783 l_mg->nr_free_lines++;
784
785 return chk_in_line;
786}
787
788static int pblk_alloc_line_meta(struct pblk *pblk, struct pblk_line *line)
789{
790 struct pblk_line_meta *lm = &pblk->lm;
791
792 line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
793 if (!line->blk_bitmap)
794 return -ENOMEM;
795
796 line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
797 if (!line->erase_bitmap)
798 goto free_blk_bitmap;
799
800
801 line->chks = kmalloc_array(lm->blk_per_line,
802 sizeof(struct nvm_chk_meta), GFP_KERNEL);
803 if (!line->chks)
804 goto free_erase_bitmap;
805
806 line->w_err_gc = kzalloc(sizeof(struct pblk_w_err_gc), GFP_KERNEL);
807 if (!line->w_err_gc)
808 goto free_chks;
809
810 return 0;
811
812free_chks:
813 kfree(line->chks);
814free_erase_bitmap:
815 kfree(line->erase_bitmap);
816free_blk_bitmap:
817 kfree(line->blk_bitmap);
818 return -ENOMEM;
819}
820
821static int pblk_line_mg_init(struct pblk *pblk)
822{
823 struct nvm_tgt_dev *dev = pblk->dev;
824 struct nvm_geo *geo = &dev->geo;
825 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
826 struct pblk_line_meta *lm = &pblk->lm;
827 int i, bb_distance;
828
829 l_mg->nr_lines = geo->num_chk;
830 l_mg->log_line = l_mg->data_line = NULL;
831 l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
832 l_mg->nr_free_lines = 0;
833 bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
834
835 INIT_LIST_HEAD(&l_mg->free_list);
836 INIT_LIST_HEAD(&l_mg->corrupt_list);
837 INIT_LIST_HEAD(&l_mg->bad_list);
838 INIT_LIST_HEAD(&l_mg->gc_full_list);
839 INIT_LIST_HEAD(&l_mg->gc_high_list);
840 INIT_LIST_HEAD(&l_mg->gc_mid_list);
841 INIT_LIST_HEAD(&l_mg->gc_low_list);
842 INIT_LIST_HEAD(&l_mg->gc_empty_list);
843 INIT_LIST_HEAD(&l_mg->gc_werr_list);
844
845 INIT_LIST_HEAD(&l_mg->emeta_list);
846
847 l_mg->gc_lists[0] = &l_mg->gc_werr_list;
848 l_mg->gc_lists[1] = &l_mg->gc_high_list;
849 l_mg->gc_lists[2] = &l_mg->gc_mid_list;
850 l_mg->gc_lists[3] = &l_mg->gc_low_list;
851
852 spin_lock_init(&l_mg->free_lock);
853 spin_lock_init(&l_mg->close_lock);
854 spin_lock_init(&l_mg->gc_lock);
855
856 l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
857 if (!l_mg->vsc_list)
858 goto fail;
859
860 l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
861 if (!l_mg->bb_template)
862 goto fail_free_vsc_list;
863
864 l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
865 if (!l_mg->bb_aux)
866 goto fail_free_bb_template;
867
868 /* smeta is always small enough to fit on a kmalloc memory allocation,
869 * emeta depends on the number of LUNs allocated to the pblk instance
870 */
871 for (i = 0; i < PBLK_DATA_LINES; i++) {
872 l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
873 if (!l_mg->sline_meta[i])
874 goto fail_free_smeta;
875 }
876
877 l_mg->bitmap_cache = kmem_cache_create("pblk_lm_bitmap",
878 lm->sec_bitmap_len, 0, 0, NULL);
879 if (!l_mg->bitmap_cache)
880 goto fail_free_smeta;
881
882 /* the bitmap pool is used for both valid and map bitmaps */
883 l_mg->bitmap_pool = mempool_create_slab_pool(PBLK_DATA_LINES * 2,
884 l_mg->bitmap_cache);
885 if (!l_mg->bitmap_pool)
886 goto fail_destroy_bitmap_cache;
887
888 /* emeta allocates three different buffers for managing metadata with
889 * in-memory and in-media layouts
890 */
891 for (i = 0; i < PBLK_DATA_LINES; i++) {
892 struct pblk_emeta *emeta;
893
894 emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
895 if (!emeta)
896 goto fail_free_emeta;
897
898 emeta->buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
899 if (!emeta->buf) {
900 kfree(emeta);
901 goto fail_free_emeta;
902 }
903
904 emeta->nr_entries = lm->emeta_sec[0];
905 l_mg->eline_meta[i] = emeta;
906 }
907
908 for (i = 0; i < l_mg->nr_lines; i++)
909 l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
910
911 bb_distance = (geo->all_luns) * geo->ws_opt;
912 for (i = 0; i < lm->sec_per_line; i += bb_distance)
913 bitmap_set(l_mg->bb_template, i, geo->ws_opt);
914
915 return 0;
916
917fail_free_emeta:
918 while (--i >= 0) {
919 kvfree(l_mg->eline_meta[i]->buf);
920 kfree(l_mg->eline_meta[i]);
921 }
922
923 mempool_destroy(l_mg->bitmap_pool);
924fail_destroy_bitmap_cache:
925 kmem_cache_destroy(l_mg->bitmap_cache);
926fail_free_smeta:
927 for (i = 0; i < PBLK_DATA_LINES; i++)
928 kfree(l_mg->sline_meta[i]);
929 kfree(l_mg->bb_aux);
930fail_free_bb_template:
931 kfree(l_mg->bb_template);
932fail_free_vsc_list:
933 kfree(l_mg->vsc_list);
934fail:
935 return -ENOMEM;
936}
937
938static int pblk_line_meta_init(struct pblk *pblk)
939{
940 struct nvm_tgt_dev *dev = pblk->dev;
941 struct nvm_geo *geo = &dev->geo;
942 struct pblk_line_meta *lm = &pblk->lm;
943 unsigned int smeta_len, emeta_len;
944 int i;
945
946 lm->sec_per_line = geo->clba * geo->all_luns;
947 lm->blk_per_line = geo->all_luns;
948 lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
949 lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
950 lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
951 lm->mid_thrs = lm->sec_per_line / 2;
952 lm->high_thrs = lm->sec_per_line / 4;
953 lm->meta_distance = (geo->all_luns / 2) * pblk->min_write_pgs;
954
955 /* Calculate necessary pages for smeta. See comment over struct
956 * line_smeta definition
957 */
958 i = 1;
959add_smeta_page:
960 lm->smeta_sec = i * geo->ws_opt;
961 lm->smeta_len = lm->smeta_sec * geo->csecs;
962
963 smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
964 if (smeta_len > lm->smeta_len) {
965 i++;
966 goto add_smeta_page;
967 }
968
969 /* Calculate necessary pages for emeta. See comment over struct
970 * line_emeta definition
971 */
972 i = 1;
973add_emeta_page:
974 lm->emeta_sec[0] = i * geo->ws_opt;
975 lm->emeta_len[0] = lm->emeta_sec[0] * geo->csecs;
976
977 emeta_len = calc_emeta_len(pblk);
978 if (emeta_len > lm->emeta_len[0]) {
979 i++;
980 goto add_emeta_page;
981 }
982
983 lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;
984
985 lm->min_blk_line = 1;
986 if (geo->all_luns > 1)
987 lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
988 lm->emeta_sec[0], geo->clba);
989
990 if (lm->min_blk_line > lm->blk_per_line) {
991 pblk_err(pblk, "config. not supported. Min. LUN in line:%d\n",
992 lm->blk_per_line);
993 return -EINVAL;
994 }
995
996 return 0;
997}
998
999static int pblk_lines_init(struct pblk *pblk)
1000{
1001 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1002 struct pblk_line *line;
1003 void *chunk_meta;
1004 int nr_free_chks = 0;
1005 int i, ret;
1006
1007 ret = pblk_line_meta_init(pblk);
1008 if (ret)
1009 return ret;
1010
1011 ret = pblk_line_mg_init(pblk);
1012 if (ret)
1013 return ret;
1014
1015 ret = pblk_luns_init(pblk);
1016 if (ret)
1017 goto fail_free_meta;
1018
1019 chunk_meta = pblk_get_chunk_meta(pblk);
1020 if (IS_ERR(chunk_meta)) {
1021 ret = PTR_ERR(chunk_meta);
1022 goto fail_free_luns;
1023 }
1024
1025 pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
1026 GFP_KERNEL);
1027 if (!pblk->lines) {
1028 ret = -ENOMEM;
1029 goto fail_free_chunk_meta;
1030 }
1031
1032 for (i = 0; i < l_mg->nr_lines; i++) {
1033 line = &pblk->lines[i];
1034
1035 ret = pblk_alloc_line_meta(pblk, line);
1036 if (ret)
1037 goto fail_free_lines;
1038
1039 nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
1040
1041 trace_pblk_line_state(pblk_disk_name(pblk), line->id,
1042 line->state);
1043 }
1044
1045 if (!nr_free_chks) {
1046 pblk_err(pblk, "too many bad blocks prevent for sane instance\n");
1047 ret = -EINTR;
1048 goto fail_free_lines;
1049 }
1050
1051 ret = pblk_set_provision(pblk, nr_free_chks);
1052 if (ret)
1053 goto fail_free_lines;
1054
1055 vfree(chunk_meta);
1056 return 0;
1057
1058fail_free_lines:
1059 while (--i >= 0)
1060 pblk_line_meta_free(l_mg, &pblk->lines[i]);
1061 kfree(pblk->lines);
1062fail_free_chunk_meta:
1063 vfree(chunk_meta);
1064fail_free_luns:
1065 kfree(pblk->luns);
1066fail_free_meta:
1067 pblk_line_mg_free(pblk);
1068
1069 return ret;
1070}
1071
1072static int pblk_writer_init(struct pblk *pblk)
1073{
1074 pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
1075 if (IS_ERR(pblk->writer_ts)) {
1076 int err = PTR_ERR(pblk->writer_ts);
1077
1078 if (err != -EINTR)
1079 pblk_err(pblk, "could not allocate writer kthread (%d)\n",
1080 err);
1081 return err;
1082 }
1083
1084 timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
1085 mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
1086
1087 return 0;
1088}
1089
1090static void pblk_writer_stop(struct pblk *pblk)
1091{
1092 /* The pipeline must be stopped and the write buffer emptied before the
1093 * write thread is stopped
1094 */
1095 WARN(pblk_rb_read_count(&pblk->rwb),
1096 "Stopping not fully persisted write buffer\n");
1097
1098 WARN(pblk_rb_sync_count(&pblk->rwb),
1099 "Stopping not fully synced write buffer\n");
1100
1101 del_timer_sync(&pblk->wtimer);
1102 if (pblk->writer_ts)
1103 kthread_stop(pblk->writer_ts);
1104}
1105
1106static void pblk_free(struct pblk *pblk)
1107{
1108 pblk_lines_free(pblk);
1109 pblk_l2p_free(pblk);
1110 pblk_rwb_free(pblk);
1111 pblk_core_free(pblk);
1112
1113 kfree(pblk);
1114}
1115
1116static void pblk_tear_down(struct pblk *pblk, bool graceful)
1117{
1118 if (graceful)
1119 __pblk_pipeline_flush(pblk);
1120 __pblk_pipeline_stop(pblk);
1121 pblk_writer_stop(pblk);
1122 pblk_rb_sync_l2p(&pblk->rwb);
1123 pblk_rl_free(&pblk->rl);
1124
1125 pblk_debug(pblk, "consistent tear down (graceful:%d)\n", graceful);
1126}
1127
1128static void pblk_exit(void *private, bool graceful)
1129{
1130 struct pblk *pblk = private;
1131
1132 pblk_gc_exit(pblk, graceful);
1133 pblk_tear_down(pblk, graceful);
1134
1135#ifdef CONFIG_NVM_PBLK_DEBUG
1136 pblk_info(pblk, "exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
1137#endif
1138
1139 pblk_free(pblk);
1140}
1141
1142static sector_t pblk_capacity(void *private)
1143{
1144 struct pblk *pblk = private;
1145
1146 return pblk->capacity * NR_PHY_IN_LOG;
1147}
1148
1149static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
1150 int flags)
1151{
1152 struct nvm_geo *geo = &dev->geo;
1153 struct request_queue *bqueue = dev->q;
1154 struct request_queue *tqueue = tdisk->queue;
1155 struct pblk *pblk;
1156 int ret;
1157
1158 pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
1159 if (!pblk)
1160 return ERR_PTR(-ENOMEM);
1161
1162 pblk->dev = dev;
1163 pblk->disk = tdisk;
1164 pblk->state = PBLK_STATE_RUNNING;
1165 trace_pblk_state(pblk_disk_name(pblk), pblk->state);
1166 pblk->gc.gc_enabled = 0;
1167
1168 if (!(geo->version == NVM_OCSSD_SPEC_12 ||
1169 geo->version == NVM_OCSSD_SPEC_20)) {
1170 pblk_err(pblk, "OCSSD version not supported (%u)\n",
1171 geo->version);
1172 kfree(pblk);
1173 return ERR_PTR(-EINVAL);
1174 }
1175
1176 if (geo->ext) {
1177 pblk_err(pblk, "extended metadata not supported\n");
1178 kfree(pblk);
1179 return ERR_PTR(-EINVAL);
1180 }
1181
1182 spin_lock_init(&pblk->resubmit_lock);
1183 spin_lock_init(&pblk->trans_lock);
1184 spin_lock_init(&pblk->lock);
1185
1186#ifdef CONFIG_NVM_PBLK_DEBUG
1187 atomic_long_set(&pblk->inflight_writes, 0);
1188 atomic_long_set(&pblk->padded_writes, 0);
1189 atomic_long_set(&pblk->padded_wb, 0);
1190 atomic_long_set(&pblk->req_writes, 0);
1191 atomic_long_set(&pblk->sub_writes, 0);
1192 atomic_long_set(&pblk->sync_writes, 0);
1193 atomic_long_set(&pblk->inflight_reads, 0);
1194 atomic_long_set(&pblk->cache_reads, 0);
1195 atomic_long_set(&pblk->sync_reads, 0);
1196 atomic_long_set(&pblk->recov_writes, 0);
1197 atomic_long_set(&pblk->recov_writes, 0);
1198 atomic_long_set(&pblk->recov_gc_writes, 0);
1199 atomic_long_set(&pblk->recov_gc_reads, 0);
1200#endif
1201
1202 atomic_long_set(&pblk->read_failed, 0);
1203 atomic_long_set(&pblk->read_empty, 0);
1204 atomic_long_set(&pblk->read_high_ecc, 0);
1205 atomic_long_set(&pblk->read_failed_gc, 0);
1206 atomic_long_set(&pblk->write_failed, 0);
1207 atomic_long_set(&pblk->erase_failed, 0);
1208
1209 ret = pblk_core_init(pblk);
1210 if (ret) {
1211 pblk_err(pblk, "could not initialize core\n");
1212 goto fail;
1213 }
1214
1215 ret = pblk_lines_init(pblk);
1216 if (ret) {
1217 pblk_err(pblk, "could not initialize lines\n");
1218 goto fail_free_core;
1219 }
1220
1221 ret = pblk_rwb_init(pblk);
1222 if (ret) {
1223 pblk_err(pblk, "could not initialize write buffer\n");
1224 goto fail_free_lines;
1225 }
1226
1227 ret = pblk_l2p_init(pblk, flags & NVM_TARGET_FACTORY);
1228 if (ret) {
1229 pblk_err(pblk, "could not initialize maps\n");
1230 goto fail_free_rwb;
1231 }
1232
1233 ret = pblk_writer_init(pblk);
1234 if (ret) {
1235 if (ret != -EINTR)
1236 pblk_err(pblk, "could not initialize write thread\n");
1237 goto fail_free_l2p;
1238 }
1239
1240 ret = pblk_gc_init(pblk);
1241 if (ret) {
1242 pblk_err(pblk, "could not initialize gc\n");
1243 goto fail_stop_writer;
1244 }
1245
1246 /* inherit the size from the underlying device */
1247 blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
1248 blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
1249
1250 blk_queue_write_cache(tqueue, true, false);
1251
1252 tqueue->limits.discard_granularity = geo->clba * geo->csecs;
1253 tqueue->limits.discard_alignment = 0;
1254 blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
1255 blk_queue_flag_set(QUEUE_FLAG_DISCARD, tqueue);
1256
1257 pblk_info(pblk, "luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
1258 geo->all_luns, pblk->l_mg.nr_lines,
1259 (unsigned long long)pblk->capacity,
1260 pblk->rwb.nr_entries);
1261
1262 wake_up_process(pblk->writer_ts);
1263
1264 /* Check if we need to start GC */
1265 pblk_gc_should_kick(pblk);
1266
1267 return pblk;
1268
1269fail_stop_writer:
1270 pblk_writer_stop(pblk);
1271fail_free_l2p:
1272 pblk_l2p_free(pblk);
1273fail_free_rwb:
1274 pblk_rwb_free(pblk);
1275fail_free_lines:
1276 pblk_lines_free(pblk);
1277fail_free_core:
1278 pblk_core_free(pblk);
1279fail:
1280 kfree(pblk);
1281 return ERR_PTR(ret);
1282}
1283
1284/* physical block device target */
1285static struct nvm_tgt_type tt_pblk = {
1286 .name = "pblk",
1287 .version = {1, 0, 0},
1288
1289 .bops = &pblk_bops,
1290 .capacity = pblk_capacity,
1291
1292 .init = pblk_init,
1293 .exit = pblk_exit,
1294
1295 .sysfs_init = pblk_sysfs_init,
1296 .sysfs_exit = pblk_sysfs_exit,
1297 .owner = THIS_MODULE,
1298};
1299
1300static int __init pblk_module_init(void)
1301{
1302 int ret;
1303
1304 ret = bioset_init(&pblk_bio_set, BIO_POOL_SIZE, 0, 0);
1305 if (ret)
1306 return ret;
1307 ret = nvm_register_tgt_type(&tt_pblk);
1308 if (ret)
1309 bioset_exit(&pblk_bio_set);
1310 return ret;
1311}
1312
1313static void pblk_module_exit(void)
1314{
1315 bioset_exit(&pblk_bio_set);
1316 nvm_unregister_tgt_type(&tt_pblk);
1317}
1318
1319module_init(pblk_module_init);
1320module_exit(pblk_module_exit);
1321MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
1322MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
1323MODULE_LICENSE("GPL v2");
1324MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");