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 int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
51 struct bio *bio)
52{
53 int ret;
54
55 /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
56 * constraint. Writes can be of arbitrary size.
57 */
58 if (bio_data_dir(bio) == READ) {
59 blk_queue_split(q, &bio);
60 ret = pblk_submit_read(pblk, bio);
61 if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
62 bio_put(bio);
63
64 return ret;
65 }
66
67 /* Prevent deadlock in the case of a modest LUN configuration and large
68 * user I/Os. Unless stalled, the rate limiter leaves at least 256KB
69 * available for user I/O.
70 */
71 if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
72 blk_queue_split(q, &bio);
73
74 return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
75}
76
77static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
78{
79 struct pblk *pblk = q->queuedata;
80
81 if (bio_op(bio) == REQ_OP_DISCARD) {
82 pblk_discard(pblk, bio);
83 if (!(bio->bi_opf & REQ_PREFLUSH)) {
84 bio_endio(bio);
85 return BLK_QC_T_NONE;
86 }
87 }
88
89 switch (pblk_rw_io(q, pblk, bio)) {
90 case NVM_IO_ERR:
91 bio_io_error(bio);
92 break;
93 case NVM_IO_DONE:
94 bio_endio(bio);
95 break;
96 }
97
98 return BLK_QC_T_NONE;
99}
100
101static size_t pblk_trans_map_size(struct pblk *pblk)
102{
103 int entry_size = 8;
104
105 if (pblk->addrf_len < 32)
106 entry_size = 4;
107
108 return entry_size * pblk->rl.nr_secs;
109}
110
111#ifdef CONFIG_NVM_PBLK_DEBUG
112static u32 pblk_l2p_crc(struct pblk *pblk)
113{
114 size_t map_size;
115 u32 crc = ~(u32)0;
116
117 map_size = pblk_trans_map_size(pblk);
118 crc = crc32_le(crc, pblk->trans_map, map_size);
119 return crc;
120}
121#endif
122
123static void pblk_l2p_free(struct pblk *pblk)
124{
125 vfree(pblk->trans_map);
126}
127
128static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
129{
130 struct pblk_line *line = NULL;
131
132 if (factory_init) {
133 guid_gen(&pblk->instance_uuid);
134 } else {
135 line = pblk_recov_l2p(pblk);
136 if (IS_ERR(line)) {
137 pblk_err(pblk, "could not recover l2p table\n");
138 return -EFAULT;
139 }
140 }
141
142#ifdef CONFIG_NVM_PBLK_DEBUG
143 pblk_info(pblk, "init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
144#endif
145
146 /* Free full lines directly as GC has not been started yet */
147 pblk_gc_free_full_lines(pblk);
148
149 if (!line) {
150 /* Configure next line for user data */
151 line = pblk_line_get_first_data(pblk);
152 if (!line)
153 return -EFAULT;
154 }
155
156 return 0;
157}
158
159static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
160{
161 sector_t i;
162 struct ppa_addr ppa;
163 size_t map_size;
164 int ret = 0;
165
166 map_size = pblk_trans_map_size(pblk);
167 pblk->trans_map = vmalloc(map_size);
168 if (!pblk->trans_map)
169 return -ENOMEM;
170
171 pblk_ppa_set_empty(&ppa);
172
173 for (i = 0; i < pblk->rl.nr_secs; i++)
174 pblk_trans_map_set(pblk, i, ppa);
175
176 ret = pblk_l2p_recover(pblk, factory_init);
177 if (ret)
178 vfree(pblk->trans_map);
179
180 return ret;
181}
182
183static void pblk_rwb_free(struct pblk *pblk)
184{
185 if (pblk_rb_tear_down_check(&pblk->rwb))
186 pblk_err(pblk, "write buffer error on tear down\n");
187
188 pblk_rb_free(&pblk->rwb);
189}
190
191static int pblk_rwb_init(struct pblk *pblk)
192{
193 struct nvm_tgt_dev *dev = pblk->dev;
194 struct nvm_geo *geo = &dev->geo;
195 unsigned long buffer_size;
196 int pgs_in_buffer, threshold;
197
198 threshold = geo->mw_cunits * geo->all_luns;
199 pgs_in_buffer = (max(geo->mw_cunits, geo->ws_opt) + geo->ws_opt)
200 * geo->all_luns;
201
202 if (write_buffer_size && (write_buffer_size > pgs_in_buffer))
203 buffer_size = write_buffer_size;
204 else
205 buffer_size = pgs_in_buffer;
206
207 return pblk_rb_init(&pblk->rwb, buffer_size, threshold, geo->csecs);
208}
209
210static int pblk_set_addrf_12(struct pblk *pblk, struct nvm_geo *geo,
211 struct nvm_addrf_12 *dst)
212{
213 struct nvm_addrf_12 *src = (struct nvm_addrf_12 *)&geo->addrf;
214 int power_len;
215
216 /* Re-calculate channel and lun format to adapt to configuration */
217 power_len = get_count_order(geo->num_ch);
218 if (1 << power_len != geo->num_ch) {
219 pblk_err(pblk, "supports only power-of-two channel config.\n");
220 return -EINVAL;
221 }
222 dst->ch_len = power_len;
223
224 power_len = get_count_order(geo->num_lun);
225 if (1 << power_len != geo->num_lun) {
226 pblk_err(pblk, "supports only power-of-two LUN config.\n");
227 return -EINVAL;
228 }
229 dst->lun_len = power_len;
230
231 dst->blk_len = src->blk_len;
232 dst->pg_len = src->pg_len;
233 dst->pln_len = src->pln_len;
234 dst->sec_len = src->sec_len;
235
236 dst->sec_offset = 0;
237 dst->pln_offset = dst->sec_len;
238 dst->ch_offset = dst->pln_offset + dst->pln_len;
239 dst->lun_offset = dst->ch_offset + dst->ch_len;
240 dst->pg_offset = dst->lun_offset + dst->lun_len;
241 dst->blk_offset = dst->pg_offset + dst->pg_len;
242
243 dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
244 dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
245 dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
246 dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
247 dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
248 dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;
249
250 return dst->blk_offset + src->blk_len;
251}
252
253static int pblk_set_addrf_20(struct nvm_geo *geo, struct nvm_addrf *adst,
254 struct pblk_addrf *udst)
255{
256 struct nvm_addrf *src = &geo->addrf;
257
258 adst->ch_len = get_count_order(geo->num_ch);
259 adst->lun_len = get_count_order(geo->num_lun);
260 adst->chk_len = src->chk_len;
261 adst->sec_len = src->sec_len;
262
263 adst->sec_offset = 0;
264 adst->ch_offset = adst->sec_len;
265 adst->lun_offset = adst->ch_offset + adst->ch_len;
266 adst->chk_offset = adst->lun_offset + adst->lun_len;
267
268 adst->sec_mask = ((1ULL << adst->sec_len) - 1) << adst->sec_offset;
269 adst->chk_mask = ((1ULL << adst->chk_len) - 1) << adst->chk_offset;
270 adst->lun_mask = ((1ULL << adst->lun_len) - 1) << adst->lun_offset;
271 adst->ch_mask = ((1ULL << adst->ch_len) - 1) << adst->ch_offset;
272
273 udst->sec_stripe = geo->ws_opt;
274 udst->ch_stripe = geo->num_ch;
275 udst->lun_stripe = geo->num_lun;
276
277 udst->sec_lun_stripe = udst->sec_stripe * udst->ch_stripe;
278 udst->sec_ws_stripe = udst->sec_lun_stripe * udst->lun_stripe;
279
280 return adst->chk_offset + adst->chk_len;
281}
282
283static int pblk_set_addrf(struct pblk *pblk)
284{
285 struct nvm_tgt_dev *dev = pblk->dev;
286 struct nvm_geo *geo = &dev->geo;
287 int mod;
288
289 switch (geo->version) {
290 case NVM_OCSSD_SPEC_12:
291 div_u64_rem(geo->clba, pblk->min_write_pgs, &mod);
292 if (mod) {
293 pblk_err(pblk, "bad configuration of sectors/pages\n");
294 return -EINVAL;
295 }
296
297 pblk->addrf_len = pblk_set_addrf_12(pblk, geo,
298 (void *)&pblk->addrf);
299 break;
300 case NVM_OCSSD_SPEC_20:
301 pblk->addrf_len = pblk_set_addrf_20(geo, (void *)&pblk->addrf,
302 &pblk->uaddrf);
303 break;
304 default:
305 pblk_err(pblk, "OCSSD revision not supported (%d)\n",
306 geo->version);
307 return -EINVAL;
308 }
309
310 return 0;
311}
312
313static int pblk_create_global_caches(void)
314{
315
316 pblk_caches.ws = kmem_cache_create("pblk_blk_ws",
317 sizeof(struct pblk_line_ws), 0, 0, NULL);
318 if (!pblk_caches.ws)
319 return -ENOMEM;
320
321 pblk_caches.rec = kmem_cache_create("pblk_rec",
322 sizeof(struct pblk_rec_ctx), 0, 0, NULL);
323 if (!pblk_caches.rec)
324 goto fail_destroy_ws;
325
326 pblk_caches.g_rq = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
327 0, 0, NULL);
328 if (!pblk_caches.g_rq)
329 goto fail_destroy_rec;
330
331 pblk_caches.w_rq = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
332 0, 0, NULL);
333 if (!pblk_caches.w_rq)
334 goto fail_destroy_g_rq;
335
336 return 0;
337
338fail_destroy_g_rq:
339 kmem_cache_destroy(pblk_caches.g_rq);
340fail_destroy_rec:
341 kmem_cache_destroy(pblk_caches.rec);
342fail_destroy_ws:
343 kmem_cache_destroy(pblk_caches.ws);
344
345 return -ENOMEM;
346}
347
348static int pblk_get_global_caches(void)
349{
350 int ret = 0;
351
352 mutex_lock(&pblk_caches.mutex);
353
354 if (kref_get_unless_zero(&pblk_caches.kref))
355 goto out;
356
357 ret = pblk_create_global_caches();
358 if (!ret)
359 kref_init(&pblk_caches.kref);
360
361out:
362 mutex_unlock(&pblk_caches.mutex);
363 return ret;
364}
365
366static void pblk_destroy_global_caches(struct kref *ref)
367{
368 struct pblk_global_caches *c;
369
370 c = container_of(ref, struct pblk_global_caches, kref);
371
372 kmem_cache_destroy(c->ws);
373 kmem_cache_destroy(c->rec);
374 kmem_cache_destroy(c->g_rq);
375 kmem_cache_destroy(c->w_rq);
376}
377
378static void pblk_put_global_caches(void)
379{
380 mutex_lock(&pblk_caches.mutex);
381 kref_put(&pblk_caches.kref, pblk_destroy_global_caches);
382 mutex_unlock(&pblk_caches.mutex);
383}
384
385static int pblk_core_init(struct pblk *pblk)
386{
387 struct nvm_tgt_dev *dev = pblk->dev;
388 struct nvm_geo *geo = &dev->geo;
389 int ret, max_write_ppas;
390
391 atomic64_set(&pblk->user_wa, 0);
392 atomic64_set(&pblk->pad_wa, 0);
393 atomic64_set(&pblk->gc_wa, 0);
394 pblk->user_rst_wa = 0;
395 pblk->pad_rst_wa = 0;
396 pblk->gc_rst_wa = 0;
397
398 atomic64_set(&pblk->nr_flush, 0);
399 pblk->nr_flush_rst = 0;
400
401 pblk->min_write_pgs = geo->ws_opt;
402 pblk->min_write_pgs_data = pblk->min_write_pgs;
403 max_write_ppas = pblk->min_write_pgs * geo->all_luns;
404 pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
405 pblk->max_write_pgs = min_t(int, pblk->max_write_pgs,
406 queue_max_hw_sectors(dev->q) / (geo->csecs >> SECTOR_SHIFT));
407 pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
408
409 pblk->oob_meta_size = geo->sos;
410 if (!pblk_is_oob_meta_supported(pblk)) {
411 /* For drives which does not have OOB metadata feature
412 * in order to support recovery feature we need to use
413 * so called packed metadata. Packed metada will store
414 * the same information as OOB metadata (l2p table mapping,
415 * but in the form of the single page at the end of
416 * every write request.
417 */
418 if (pblk->min_write_pgs
419 * sizeof(struct pblk_sec_meta) > PAGE_SIZE) {
420 /* We want to keep all the packed metadata on single
421 * page per write requests. So we need to ensure that
422 * it will fit.
423 *
424 * This is more like sanity check, since there is
425 * no device with such a big minimal write size
426 * (above 1 metabytes).
427 */
428 pblk_err(pblk, "Not supported min write size\n");
429 return -EINVAL;
430 }
431 /* For packed meta approach we do some simplification.
432 * On read path we always issue requests which size
433 * equal to max_write_pgs, with all pages filled with
434 * user payload except of last one page which will be
435 * filled with packed metadata.
436 */
437 pblk->max_write_pgs = pblk->min_write_pgs;
438 pblk->min_write_pgs_data = pblk->min_write_pgs - 1;
439 }
440
441 pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t),
442 GFP_KERNEL);
443 if (!pblk->pad_dist)
444 return -ENOMEM;
445
446 if (pblk_get_global_caches())
447 goto fail_free_pad_dist;
448
449 /* Internal bios can be at most the sectors signaled by the device. */
450 ret = mempool_init_page_pool(&pblk->page_bio_pool, NVM_MAX_VLBA, 0);
451 if (ret)
452 goto free_global_caches;
453
454 ret = mempool_init_slab_pool(&pblk->gen_ws_pool, PBLK_GEN_WS_POOL_SIZE,
455 pblk_caches.ws);
456 if (ret)
457 goto free_page_bio_pool;
458
459 ret = mempool_init_slab_pool(&pblk->rec_pool, geo->all_luns,
460 pblk_caches.rec);
461 if (ret)
462 goto free_gen_ws_pool;
463
464 ret = mempool_init_slab_pool(&pblk->r_rq_pool, geo->all_luns,
465 pblk_caches.g_rq);
466 if (ret)
467 goto free_rec_pool;
468
469 ret = mempool_init_slab_pool(&pblk->e_rq_pool, geo->all_luns,
470 pblk_caches.g_rq);
471 if (ret)
472 goto free_r_rq_pool;
473
474 ret = mempool_init_slab_pool(&pblk->w_rq_pool, geo->all_luns,
475 pblk_caches.w_rq);
476 if (ret)
477 goto free_e_rq_pool;
478
479 pblk->close_wq = alloc_workqueue("pblk-close-wq",
480 WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
481 if (!pblk->close_wq)
482 goto free_w_rq_pool;
483
484 pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
485 WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
486 if (!pblk->bb_wq)
487 goto free_close_wq;
488
489 pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
490 WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
491 if (!pblk->r_end_wq)
492 goto free_bb_wq;
493
494 if (pblk_set_addrf(pblk))
495 goto free_r_end_wq;
496
497 INIT_LIST_HEAD(&pblk->compl_list);
498 INIT_LIST_HEAD(&pblk->resubmit_list);
499
500 return 0;
501
502free_r_end_wq:
503 destroy_workqueue(pblk->r_end_wq);
504free_bb_wq:
505 destroy_workqueue(pblk->bb_wq);
506free_close_wq:
507 destroy_workqueue(pblk->close_wq);
508free_w_rq_pool:
509 mempool_exit(&pblk->w_rq_pool);
510free_e_rq_pool:
511 mempool_exit(&pblk->e_rq_pool);
512free_r_rq_pool:
513 mempool_exit(&pblk->r_rq_pool);
514free_rec_pool:
515 mempool_exit(&pblk->rec_pool);
516free_gen_ws_pool:
517 mempool_exit(&pblk->gen_ws_pool);
518free_page_bio_pool:
519 mempool_exit(&pblk->page_bio_pool);
520free_global_caches:
521 pblk_put_global_caches();
522fail_free_pad_dist:
523 kfree(pblk->pad_dist);
524 return -ENOMEM;
525}
526
527static void pblk_core_free(struct pblk *pblk)
528{
529 if (pblk->close_wq)
530 destroy_workqueue(pblk->close_wq);
531
532 if (pblk->r_end_wq)
533 destroy_workqueue(pblk->r_end_wq);
534
535 if (pblk->bb_wq)
536 destroy_workqueue(pblk->bb_wq);
537
538 mempool_exit(&pblk->page_bio_pool);
539 mempool_exit(&pblk->gen_ws_pool);
540 mempool_exit(&pblk->rec_pool);
541 mempool_exit(&pblk->r_rq_pool);
542 mempool_exit(&pblk->e_rq_pool);
543 mempool_exit(&pblk->w_rq_pool);
544
545 pblk_put_global_caches();
546 kfree(pblk->pad_dist);
547}
548
549static void pblk_line_mg_free(struct pblk *pblk)
550{
551 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
552 int i;
553
554 kfree(l_mg->bb_template);
555 kfree(l_mg->bb_aux);
556 kfree(l_mg->vsc_list);
557
558 for (i = 0; i < PBLK_DATA_LINES; i++) {
559 kfree(l_mg->sline_meta[i]);
560 pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
561 kfree(l_mg->eline_meta[i]);
562 }
563
564 mempool_destroy(l_mg->bitmap_pool);
565 kmem_cache_destroy(l_mg->bitmap_cache);
566}
567
568static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
569 struct pblk_line *line)
570{
571 struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
572
573 kfree(line->blk_bitmap);
574 kfree(line->erase_bitmap);
575 kfree(line->chks);
576
577 pblk_mfree(w_err_gc->lba_list, l_mg->emeta_alloc_type);
578 kfree(w_err_gc);
579}
580
581static void pblk_lines_free(struct pblk *pblk)
582{
583 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
584 struct pblk_line *line;
585 int i;
586
587 for (i = 0; i < l_mg->nr_lines; i++) {
588 line = &pblk->lines[i];
589
590 pblk_line_free(line);
591 pblk_line_meta_free(l_mg, line);
592 }
593
594 pblk_line_mg_free(pblk);
595
596 kfree(pblk->luns);
597 kfree(pblk->lines);
598}
599
600static int pblk_luns_init(struct pblk *pblk)
601{
602 struct nvm_tgt_dev *dev = pblk->dev;
603 struct nvm_geo *geo = &dev->geo;
604 struct pblk_lun *rlun;
605 int i;
606
607 /* TODO: Implement unbalanced LUN support */
608 if (geo->num_lun < 0) {
609 pblk_err(pblk, "unbalanced LUN config.\n");
610 return -EINVAL;
611 }
612
613 pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
614 GFP_KERNEL);
615 if (!pblk->luns)
616 return -ENOMEM;
617
618 for (i = 0; i < geo->all_luns; i++) {
619 /* Stripe across channels */
620 int ch = i % geo->num_ch;
621 int lun_raw = i / geo->num_ch;
622 int lunid = lun_raw + ch * geo->num_lun;
623
624 rlun = &pblk->luns[i];
625 rlun->bppa = dev->luns[lunid];
626
627 sema_init(&rlun->wr_sem, 1);
628 }
629
630 return 0;
631}
632
633/* See comment over struct line_emeta definition */
634static unsigned int calc_emeta_len(struct pblk *pblk)
635{
636 struct pblk_line_meta *lm = &pblk->lm;
637 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
638 struct nvm_tgt_dev *dev = pblk->dev;
639 struct nvm_geo *geo = &dev->geo;
640
641 /* Round to sector size so that lba_list starts on its own sector */
642 lm->emeta_sec[1] = DIV_ROUND_UP(
643 sizeof(struct line_emeta) + lm->blk_bitmap_len +
644 sizeof(struct wa_counters), geo->csecs);
645 lm->emeta_len[1] = lm->emeta_sec[1] * geo->csecs;
646
647 /* Round to sector size so that vsc_list starts on its own sector */
648 lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
649 lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
650 geo->csecs);
651 lm->emeta_len[2] = lm->emeta_sec[2] * geo->csecs;
652
653 lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
654 geo->csecs);
655 lm->emeta_len[3] = lm->emeta_sec[3] * geo->csecs;
656
657 lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);
658
659 return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
660}
661
662static int pblk_set_provision(struct pblk *pblk, int nr_free_chks)
663{
664 struct nvm_tgt_dev *dev = pblk->dev;
665 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
666 struct pblk_line_meta *lm = &pblk->lm;
667 struct nvm_geo *geo = &dev->geo;
668 sector_t provisioned;
669 int sec_meta, blk_meta, clba;
670 int minimum;
671
672 if (geo->op == NVM_TARGET_DEFAULT_OP)
673 pblk->op = PBLK_DEFAULT_OP;
674 else
675 pblk->op = geo->op;
676
677 minimum = pblk_get_min_chks(pblk);
678 provisioned = nr_free_chks;
679 provisioned *= (100 - pblk->op);
680 sector_div(provisioned, 100);
681
682 if ((nr_free_chks - provisioned) < minimum) {
683 if (geo->op != NVM_TARGET_DEFAULT_OP) {
684 pblk_err(pblk, "OP too small to create a sane instance\n");
685 return -EINTR;
686 }
687
688 /* If the user did not specify an OP value, and PBLK_DEFAULT_OP
689 * is not enough, calculate and set sane value
690 */
691
692 provisioned = nr_free_chks - minimum;
693 pblk->op = (100 * minimum) / nr_free_chks;
694 pblk_info(pblk, "Default OP insufficient, adjusting OP to %d\n",
695 pblk->op);
696 }
697
698 pblk->op_blks = nr_free_chks - provisioned;
699
700 /* Internally pblk manages all free blocks, but all calculations based
701 * on user capacity consider only provisioned blocks
702 */
703 pblk->rl.total_blocks = nr_free_chks;
704 pblk->rl.nr_secs = nr_free_chks * geo->clba;
705
706 /* Consider sectors used for metadata */
707 sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
708 blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);
709
710 clba = (geo->clba / pblk->min_write_pgs) * pblk->min_write_pgs_data;
711 pblk->capacity = (provisioned - blk_meta) * clba;
712
713 atomic_set(&pblk->rl.free_blocks, nr_free_chks);
714 atomic_set(&pblk->rl.free_user_blocks, nr_free_chks);
715
716 return 0;
717}
718
719static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
720 struct nvm_chk_meta *meta)
721{
722 struct nvm_tgt_dev *dev = pblk->dev;
723 struct nvm_geo *geo = &dev->geo;
724 struct pblk_line_meta *lm = &pblk->lm;
725 int i, nr_bad_chks = 0;
726
727 for (i = 0; i < lm->blk_per_line; i++) {
728 struct pblk_lun *rlun = &pblk->luns[i];
729 struct nvm_chk_meta *chunk;
730 struct nvm_chk_meta *chunk_meta;
731 struct ppa_addr ppa;
732 int pos;
733
734 ppa = rlun->bppa;
735 pos = pblk_ppa_to_pos(geo, ppa);
736 chunk = &line->chks[pos];
737
738 ppa.m.chk = line->id;
739 chunk_meta = pblk_chunk_get_off(pblk, meta, ppa);
740
741 chunk->state = chunk_meta->state;
742 chunk->type = chunk_meta->type;
743 chunk->wi = chunk_meta->wi;
744 chunk->slba = chunk_meta->slba;
745 chunk->cnlb = chunk_meta->cnlb;
746 chunk->wp = chunk_meta->wp;
747
748 trace_pblk_chunk_state(pblk_disk_name(pblk), &ppa,
749 chunk->state);
750
751 if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
752 WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
753 continue;
754 }
755
756 if (!(chunk->state & NVM_CHK_ST_OFFLINE))
757 continue;
758
759 set_bit(pos, line->blk_bitmap);
760 nr_bad_chks++;
761 }
762
763 return nr_bad_chks;
764}
765
766static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
767 void *chunk_meta, int line_id)
768{
769 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
770 struct pblk_line_meta *lm = &pblk->lm;
771 long nr_bad_chks, chk_in_line;
772
773 line->pblk = pblk;
774 line->id = line_id;
775 line->type = PBLK_LINETYPE_FREE;
776 line->state = PBLK_LINESTATE_NEW;
777 line->gc_group = PBLK_LINEGC_NONE;
778 line->vsc = &l_mg->vsc_list[line_id];
779 spin_lock_init(&line->lock);
780
781 nr_bad_chks = pblk_setup_line_meta_chk(pblk, line, chunk_meta);
782
783 chk_in_line = lm->blk_per_line - nr_bad_chks;
784 if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
785 chk_in_line < lm->min_blk_line) {
786 line->state = PBLK_LINESTATE_BAD;
787 list_add_tail(&line->list, &l_mg->bad_list);
788 return 0;
789 }
790
791 atomic_set(&line->blk_in_line, chk_in_line);
792 list_add_tail(&line->list, &l_mg->free_list);
793 l_mg->nr_free_lines++;
794
795 return chk_in_line;
796}
797
798static int pblk_alloc_line_meta(struct pblk *pblk, struct pblk_line *line)
799{
800 struct pblk_line_meta *lm = &pblk->lm;
801
802 line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
803 if (!line->blk_bitmap)
804 return -ENOMEM;
805
806 line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
807 if (!line->erase_bitmap)
808 goto free_blk_bitmap;
809
810
811 line->chks = kmalloc_array(lm->blk_per_line,
812 sizeof(struct nvm_chk_meta), GFP_KERNEL);
813 if (!line->chks)
814 goto free_erase_bitmap;
815
816 line->w_err_gc = kzalloc(sizeof(struct pblk_w_err_gc), GFP_KERNEL);
817 if (!line->w_err_gc)
818 goto free_chks;
819
820 return 0;
821
822free_chks:
823 kfree(line->chks);
824free_erase_bitmap:
825 kfree(line->erase_bitmap);
826free_blk_bitmap:
827 kfree(line->blk_bitmap);
828 return -ENOMEM;
829}
830
831static int pblk_line_mg_init(struct pblk *pblk)
832{
833 struct nvm_tgt_dev *dev = pblk->dev;
834 struct nvm_geo *geo = &dev->geo;
835 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
836 struct pblk_line_meta *lm = &pblk->lm;
837 int i, bb_distance;
838
839 l_mg->nr_lines = geo->num_chk;
840 l_mg->log_line = l_mg->data_line = NULL;
841 l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
842 l_mg->nr_free_lines = 0;
843 bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
844
845 INIT_LIST_HEAD(&l_mg->free_list);
846 INIT_LIST_HEAD(&l_mg->corrupt_list);
847 INIT_LIST_HEAD(&l_mg->bad_list);
848 INIT_LIST_HEAD(&l_mg->gc_full_list);
849 INIT_LIST_HEAD(&l_mg->gc_high_list);
850 INIT_LIST_HEAD(&l_mg->gc_mid_list);
851 INIT_LIST_HEAD(&l_mg->gc_low_list);
852 INIT_LIST_HEAD(&l_mg->gc_empty_list);
853 INIT_LIST_HEAD(&l_mg->gc_werr_list);
854
855 INIT_LIST_HEAD(&l_mg->emeta_list);
856
857 l_mg->gc_lists[0] = &l_mg->gc_werr_list;
858 l_mg->gc_lists[1] = &l_mg->gc_high_list;
859 l_mg->gc_lists[2] = &l_mg->gc_mid_list;
860 l_mg->gc_lists[3] = &l_mg->gc_low_list;
861
862 spin_lock_init(&l_mg->free_lock);
863 spin_lock_init(&l_mg->close_lock);
864 spin_lock_init(&l_mg->gc_lock);
865
866 l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
867 if (!l_mg->vsc_list)
868 goto fail;
869
870 l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
871 if (!l_mg->bb_template)
872 goto fail_free_vsc_list;
873
874 l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
875 if (!l_mg->bb_aux)
876 goto fail_free_bb_template;
877
878 /* smeta is always small enough to fit on a kmalloc memory allocation,
879 * emeta depends on the number of LUNs allocated to the pblk instance
880 */
881 for (i = 0; i < PBLK_DATA_LINES; i++) {
882 l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
883 if (!l_mg->sline_meta[i])
884 goto fail_free_smeta;
885 }
886
887 l_mg->bitmap_cache = kmem_cache_create("pblk_lm_bitmap",
888 lm->sec_bitmap_len, 0, 0, NULL);
889 if (!l_mg->bitmap_cache)
890 goto fail_free_smeta;
891
892 /* the bitmap pool is used for both valid and map bitmaps */
893 l_mg->bitmap_pool = mempool_create_slab_pool(PBLK_DATA_LINES * 2,
894 l_mg->bitmap_cache);
895 if (!l_mg->bitmap_pool)
896 goto fail_destroy_bitmap_cache;
897
898 /* emeta allocates three different buffers for managing metadata with
899 * in-memory and in-media layouts
900 */
901 for (i = 0; i < PBLK_DATA_LINES; i++) {
902 struct pblk_emeta *emeta;
903
904 emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
905 if (!emeta)
906 goto fail_free_emeta;
907
908 if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
909 l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
910
911 emeta->buf = vmalloc(lm->emeta_len[0]);
912 if (!emeta->buf) {
913 kfree(emeta);
914 goto fail_free_emeta;
915 }
916
917 emeta->nr_entries = lm->emeta_sec[0];
918 l_mg->eline_meta[i] = emeta;
919 } else {
920 l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
921
922 emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
923 if (!emeta->buf) {
924 kfree(emeta);
925 goto fail_free_emeta;
926 }
927
928 emeta->nr_entries = lm->emeta_sec[0];
929 l_mg->eline_meta[i] = emeta;
930 }
931 }
932
933 for (i = 0; i < l_mg->nr_lines; i++)
934 l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
935
936 bb_distance = (geo->all_luns) * geo->ws_opt;
937 for (i = 0; i < lm->sec_per_line; i += bb_distance)
938 bitmap_set(l_mg->bb_template, i, geo->ws_opt);
939
940 return 0;
941
942fail_free_emeta:
943 while (--i >= 0) {
944 if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
945 vfree(l_mg->eline_meta[i]->buf);
946 else
947 kfree(l_mg->eline_meta[i]->buf);
948 kfree(l_mg->eline_meta[i]);
949 }
950
951 mempool_destroy(l_mg->bitmap_pool);
952fail_destroy_bitmap_cache:
953 kmem_cache_destroy(l_mg->bitmap_cache);
954fail_free_smeta:
955 for (i = 0; i < PBLK_DATA_LINES; i++)
956 kfree(l_mg->sline_meta[i]);
957 kfree(l_mg->bb_aux);
958fail_free_bb_template:
959 kfree(l_mg->bb_template);
960fail_free_vsc_list:
961 kfree(l_mg->vsc_list);
962fail:
963 return -ENOMEM;
964}
965
966static int pblk_line_meta_init(struct pblk *pblk)
967{
968 struct nvm_tgt_dev *dev = pblk->dev;
969 struct nvm_geo *geo = &dev->geo;
970 struct pblk_line_meta *lm = &pblk->lm;
971 unsigned int smeta_len, emeta_len;
972 int i;
973
974 lm->sec_per_line = geo->clba * geo->all_luns;
975 lm->blk_per_line = geo->all_luns;
976 lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
977 lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
978 lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
979 lm->mid_thrs = lm->sec_per_line / 2;
980 lm->high_thrs = lm->sec_per_line / 4;
981 lm->meta_distance = (geo->all_luns / 2) * pblk->min_write_pgs;
982
983 /* Calculate necessary pages for smeta. See comment over struct
984 * line_smeta definition
985 */
986 i = 1;
987add_smeta_page:
988 lm->smeta_sec = i * geo->ws_opt;
989 lm->smeta_len = lm->smeta_sec * geo->csecs;
990
991 smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
992 if (smeta_len > lm->smeta_len) {
993 i++;
994 goto add_smeta_page;
995 }
996
997 /* Calculate necessary pages for emeta. See comment over struct
998 * line_emeta definition
999 */
1000 i = 1;
1001add_emeta_page:
1002 lm->emeta_sec[0] = i * geo->ws_opt;
1003 lm->emeta_len[0] = lm->emeta_sec[0] * geo->csecs;
1004
1005 emeta_len = calc_emeta_len(pblk);
1006 if (emeta_len > lm->emeta_len[0]) {
1007 i++;
1008 goto add_emeta_page;
1009 }
1010
1011 lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;
1012
1013 lm->min_blk_line = 1;
1014 if (geo->all_luns > 1)
1015 lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
1016 lm->emeta_sec[0], geo->clba);
1017
1018 if (lm->min_blk_line > lm->blk_per_line) {
1019 pblk_err(pblk, "config. not supported. Min. LUN in line:%d\n",
1020 lm->blk_per_line);
1021 return -EINVAL;
1022 }
1023
1024 return 0;
1025}
1026
1027static int pblk_lines_init(struct pblk *pblk)
1028{
1029 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1030 struct pblk_line *line;
1031 void *chunk_meta;
1032 int nr_free_chks = 0;
1033 int i, ret;
1034
1035 ret = pblk_line_meta_init(pblk);
1036 if (ret)
1037 return ret;
1038
1039 ret = pblk_line_mg_init(pblk);
1040 if (ret)
1041 return ret;
1042
1043 ret = pblk_luns_init(pblk);
1044 if (ret)
1045 goto fail_free_meta;
1046
1047 chunk_meta = pblk_get_chunk_meta(pblk);
1048 if (IS_ERR(chunk_meta)) {
1049 ret = PTR_ERR(chunk_meta);
1050 goto fail_free_luns;
1051 }
1052
1053 pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
1054 GFP_KERNEL);
1055 if (!pblk->lines) {
1056 ret = -ENOMEM;
1057 goto fail_free_chunk_meta;
1058 }
1059
1060 for (i = 0; i < l_mg->nr_lines; i++) {
1061 line = &pblk->lines[i];
1062
1063 ret = pblk_alloc_line_meta(pblk, line);
1064 if (ret)
1065 goto fail_free_lines;
1066
1067 nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
1068
1069 trace_pblk_line_state(pblk_disk_name(pblk), line->id,
1070 line->state);
1071 }
1072
1073 if (!nr_free_chks) {
1074 pblk_err(pblk, "too many bad blocks prevent for sane instance\n");
1075 ret = -EINTR;
1076 goto fail_free_lines;
1077 }
1078
1079 ret = pblk_set_provision(pblk, nr_free_chks);
1080 if (ret)
1081 goto fail_free_lines;
1082
1083 vfree(chunk_meta);
1084 return 0;
1085
1086fail_free_lines:
1087 while (--i >= 0)
1088 pblk_line_meta_free(l_mg, &pblk->lines[i]);
1089 kfree(pblk->lines);
1090fail_free_chunk_meta:
1091 vfree(chunk_meta);
1092fail_free_luns:
1093 kfree(pblk->luns);
1094fail_free_meta:
1095 pblk_line_mg_free(pblk);
1096
1097 return ret;
1098}
1099
1100static int pblk_writer_init(struct pblk *pblk)
1101{
1102 pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
1103 if (IS_ERR(pblk->writer_ts)) {
1104 int err = PTR_ERR(pblk->writer_ts);
1105
1106 if (err != -EINTR)
1107 pblk_err(pblk, "could not allocate writer kthread (%d)\n",
1108 err);
1109 return err;
1110 }
1111
1112 timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
1113 mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
1114
1115 return 0;
1116}
1117
1118static void pblk_writer_stop(struct pblk *pblk)
1119{
1120 /* The pipeline must be stopped and the write buffer emptied before the
1121 * write thread is stopped
1122 */
1123 WARN(pblk_rb_read_count(&pblk->rwb),
1124 "Stopping not fully persisted write buffer\n");
1125
1126 WARN(pblk_rb_sync_count(&pblk->rwb),
1127 "Stopping not fully synced write buffer\n");
1128
1129 del_timer_sync(&pblk->wtimer);
1130 if (pblk->writer_ts)
1131 kthread_stop(pblk->writer_ts);
1132}
1133
1134static void pblk_free(struct pblk *pblk)
1135{
1136 pblk_lines_free(pblk);
1137 pblk_l2p_free(pblk);
1138 pblk_rwb_free(pblk);
1139 pblk_core_free(pblk);
1140
1141 kfree(pblk);
1142}
1143
1144static void pblk_tear_down(struct pblk *pblk, bool graceful)
1145{
1146 if (graceful)
1147 __pblk_pipeline_flush(pblk);
1148 __pblk_pipeline_stop(pblk);
1149 pblk_writer_stop(pblk);
1150 pblk_rb_sync_l2p(&pblk->rwb);
1151 pblk_rl_free(&pblk->rl);
1152
1153 pblk_debug(pblk, "consistent tear down (graceful:%d)\n", graceful);
1154}
1155
1156static void pblk_exit(void *private, bool graceful)
1157{
1158 struct pblk *pblk = private;
1159
1160 pblk_gc_exit(pblk, graceful);
1161 pblk_tear_down(pblk, graceful);
1162
1163#ifdef CONFIG_NVM_PBLK_DEBUG
1164 pblk_info(pblk, "exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
1165#endif
1166
1167 pblk_free(pblk);
1168}
1169
1170static sector_t pblk_capacity(void *private)
1171{
1172 struct pblk *pblk = private;
1173
1174 return pblk->capacity * NR_PHY_IN_LOG;
1175}
1176
1177static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
1178 int flags)
1179{
1180 struct nvm_geo *geo = &dev->geo;
1181 struct request_queue *bqueue = dev->q;
1182 struct request_queue *tqueue = tdisk->queue;
1183 struct pblk *pblk;
1184 int ret;
1185
1186 pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
1187 if (!pblk)
1188 return ERR_PTR(-ENOMEM);
1189
1190 pblk->dev = dev;
1191 pblk->disk = tdisk;
1192 pblk->state = PBLK_STATE_RUNNING;
1193 trace_pblk_state(pblk_disk_name(pblk), pblk->state);
1194 pblk->gc.gc_enabled = 0;
1195
1196 if (!(geo->version == NVM_OCSSD_SPEC_12 ||
1197 geo->version == NVM_OCSSD_SPEC_20)) {
1198 pblk_err(pblk, "OCSSD version not supported (%u)\n",
1199 geo->version);
1200 kfree(pblk);
1201 return ERR_PTR(-EINVAL);
1202 }
1203
1204 if (geo->ext) {
1205 pblk_err(pblk, "extended metadata not supported\n");
1206 kfree(pblk);
1207 return ERR_PTR(-EINVAL);
1208 }
1209
1210 spin_lock_init(&pblk->resubmit_lock);
1211 spin_lock_init(&pblk->trans_lock);
1212 spin_lock_init(&pblk->lock);
1213
1214#ifdef CONFIG_NVM_PBLK_DEBUG
1215 atomic_long_set(&pblk->inflight_writes, 0);
1216 atomic_long_set(&pblk->padded_writes, 0);
1217 atomic_long_set(&pblk->padded_wb, 0);
1218 atomic_long_set(&pblk->req_writes, 0);
1219 atomic_long_set(&pblk->sub_writes, 0);
1220 atomic_long_set(&pblk->sync_writes, 0);
1221 atomic_long_set(&pblk->inflight_reads, 0);
1222 atomic_long_set(&pblk->cache_reads, 0);
1223 atomic_long_set(&pblk->sync_reads, 0);
1224 atomic_long_set(&pblk->recov_writes, 0);
1225 atomic_long_set(&pblk->recov_writes, 0);
1226 atomic_long_set(&pblk->recov_gc_writes, 0);
1227 atomic_long_set(&pblk->recov_gc_reads, 0);
1228#endif
1229
1230 atomic_long_set(&pblk->read_failed, 0);
1231 atomic_long_set(&pblk->read_empty, 0);
1232 atomic_long_set(&pblk->read_high_ecc, 0);
1233 atomic_long_set(&pblk->read_failed_gc, 0);
1234 atomic_long_set(&pblk->write_failed, 0);
1235 atomic_long_set(&pblk->erase_failed, 0);
1236
1237 ret = pblk_core_init(pblk);
1238 if (ret) {
1239 pblk_err(pblk, "could not initialize core\n");
1240 goto fail;
1241 }
1242
1243 ret = pblk_lines_init(pblk);
1244 if (ret) {
1245 pblk_err(pblk, "could not initialize lines\n");
1246 goto fail_free_core;
1247 }
1248
1249 ret = pblk_rwb_init(pblk);
1250 if (ret) {
1251 pblk_err(pblk, "could not initialize write buffer\n");
1252 goto fail_free_lines;
1253 }
1254
1255 ret = pblk_l2p_init(pblk, flags & NVM_TARGET_FACTORY);
1256 if (ret) {
1257 pblk_err(pblk, "could not initialize maps\n");
1258 goto fail_free_rwb;
1259 }
1260
1261 ret = pblk_writer_init(pblk);
1262 if (ret) {
1263 if (ret != -EINTR)
1264 pblk_err(pblk, "could not initialize write thread\n");
1265 goto fail_free_l2p;
1266 }
1267
1268 ret = pblk_gc_init(pblk);
1269 if (ret) {
1270 pblk_err(pblk, "could not initialize gc\n");
1271 goto fail_stop_writer;
1272 }
1273
1274 /* inherit the size from the underlying device */
1275 blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
1276 blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
1277
1278 blk_queue_write_cache(tqueue, true, false);
1279
1280 tqueue->limits.discard_granularity = geo->clba * geo->csecs;
1281 tqueue->limits.discard_alignment = 0;
1282 blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
1283 blk_queue_flag_set(QUEUE_FLAG_DISCARD, tqueue);
1284
1285 pblk_info(pblk, "luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
1286 geo->all_luns, pblk->l_mg.nr_lines,
1287 (unsigned long long)pblk->rl.nr_secs,
1288 pblk->rwb.nr_entries);
1289
1290 wake_up_process(pblk->writer_ts);
1291
1292 /* Check if we need to start GC */
1293 pblk_gc_should_kick(pblk);
1294
1295 return pblk;
1296
1297fail_stop_writer:
1298 pblk_writer_stop(pblk);
1299fail_free_l2p:
1300 pblk_l2p_free(pblk);
1301fail_free_rwb:
1302 pblk_rwb_free(pblk);
1303fail_free_lines:
1304 pblk_lines_free(pblk);
1305fail_free_core:
1306 pblk_core_free(pblk);
1307fail:
1308 kfree(pblk);
1309 return ERR_PTR(ret);
1310}
1311
1312/* physical block device target */
1313static struct nvm_tgt_type tt_pblk = {
1314 .name = "pblk",
1315 .version = {1, 0, 0},
1316
1317 .make_rq = pblk_make_rq,
1318 .capacity = pblk_capacity,
1319
1320 .init = pblk_init,
1321 .exit = pblk_exit,
1322
1323 .sysfs_init = pblk_sysfs_init,
1324 .sysfs_exit = pblk_sysfs_exit,
1325 .owner = THIS_MODULE,
1326};
1327
1328static int __init pblk_module_init(void)
1329{
1330 int ret;
1331
1332 ret = bioset_init(&pblk_bio_set, BIO_POOL_SIZE, 0, 0);
1333 if (ret)
1334 return ret;
1335 ret = nvm_register_tgt_type(&tt_pblk);
1336 if (ret)
1337 bioset_exit(&pblk_bio_set);
1338 return ret;
1339}
1340
1341static void pblk_module_exit(void)
1342{
1343 bioset_exit(&pblk_bio_set);
1344 nvm_unregister_tgt_type(&tt_pblk);
1345}
1346
1347module_init(pblk_module_init);
1348module_exit(pblk_module_exit);
1349MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
1350MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
1351MODULE_LICENSE("GPL v2");
1352MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");
1353