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