aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/lightnvm/pblk-init.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/lightnvm/pblk-init.c')
-rw-r--r--drivers/lightnvm/pblk-init.c949
1 files changed, 949 insertions, 0 deletions
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
new file mode 100644
index 000000000000..94653b1f1300
--- /dev/null
+++ b/drivers/lightnvm/pblk-init.c
@@ -0,0 +1,949 @@
1/*
2 * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
3 * Copyright (C) 2016 CNEX Labs
4 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
5 * Matias Bjorling <matias@cnexlabs.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * Implementation of a physical block-device target for Open-channel SSDs.
17 *
18 * pblk-init.c - pblk's initialization.
19 */
20
21#include "pblk.h"
22
23static struct kmem_cache *pblk_blk_ws_cache, *pblk_rec_cache, *pblk_r_rq_cache,
24 *pblk_w_rq_cache, *pblk_line_meta_cache;
25static DECLARE_RWSEM(pblk_lock);
26
27static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
28 struct bio *bio)
29{
30 int ret;
31
32 /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
33 * constraint. Writes can be of arbitrary size.
34 */
35 if (bio_data_dir(bio) == READ) {
36 blk_queue_split(q, &bio, q->bio_split);
37 ret = pblk_submit_read(pblk, bio);
38 if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
39 bio_put(bio);
40
41 return ret;
42 }
43
44 /* Prevent deadlock in the case of a modest LUN configuration and large
45 * user I/Os. Unless stalled, the rate limiter leaves at least 256KB
46 * available for user I/O.
47 */
48 if (unlikely(pblk_get_secs(bio) >= pblk_rl_sysfs_rate_show(&pblk->rl)))
49 blk_queue_split(q, &bio, q->bio_split);
50
51 return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
52}
53
54static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
55{
56 struct pblk *pblk = q->queuedata;
57
58 if (bio_op(bio) == REQ_OP_DISCARD) {
59 pblk_discard(pblk, bio);
60 if (!(bio->bi_opf & REQ_PREFLUSH)) {
61 bio_endio(bio);
62 return BLK_QC_T_NONE;
63 }
64 }
65
66 switch (pblk_rw_io(q, pblk, bio)) {
67 case NVM_IO_ERR:
68 bio_io_error(bio);
69 break;
70 case NVM_IO_DONE:
71 bio_endio(bio);
72 break;
73 }
74
75 return BLK_QC_T_NONE;
76}
77
78static void pblk_l2p_free(struct pblk *pblk)
79{
80 vfree(pblk->trans_map);
81}
82
83static int pblk_l2p_init(struct pblk *pblk)
84{
85 sector_t i;
86 struct ppa_addr ppa;
87 int entry_size = 8;
88
89 if (pblk->ppaf_bitsize < 32)
90 entry_size = 4;
91
92 pblk->trans_map = vmalloc(entry_size * pblk->rl.nr_secs);
93 if (!pblk->trans_map)
94 return -ENOMEM;
95
96 pblk_ppa_set_empty(&ppa);
97
98 for (i = 0; i < pblk->rl.nr_secs; i++)
99 pblk_trans_map_set(pblk, i, ppa);
100
101 return 0;
102}
103
104static void pblk_rwb_free(struct pblk *pblk)
105{
106 if (pblk_rb_tear_down_check(&pblk->rwb))
107 pr_err("pblk: write buffer error on tear down\n");
108
109 pblk_rb_data_free(&pblk->rwb);
110 vfree(pblk_rb_entries_ref(&pblk->rwb));
111}
112
113static int pblk_rwb_init(struct pblk *pblk)
114{
115 struct nvm_tgt_dev *dev = pblk->dev;
116 struct nvm_geo *geo = &dev->geo;
117 struct pblk_rb_entry *entries;
118 unsigned long nr_entries;
119 unsigned int power_size, power_seg_sz;
120
121 nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer);
122
123 entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry));
124 if (!entries)
125 return -ENOMEM;
126
127 power_size = get_count_order(nr_entries);
128 power_seg_sz = get_count_order(geo->sec_size);
129
130 return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
131}
132
133/* Minimum pages needed within a lun */
134#define PAGE_POOL_SIZE 16
135#define ADDR_POOL_SIZE 64
136
137static int pblk_set_ppaf(struct pblk *pblk)
138{
139 struct nvm_tgt_dev *dev = pblk->dev;
140 struct nvm_geo *geo = &dev->geo;
141 struct nvm_addr_format ppaf = geo->ppaf;
142 int power_len;
143
144 /* Re-calculate channel and lun format to adapt to configuration */
145 power_len = get_count_order(geo->nr_chnls);
146 if (1 << power_len != geo->nr_chnls) {
147 pr_err("pblk: supports only power-of-two channel config.\n");
148 return -EINVAL;
149 }
150 ppaf.ch_len = power_len;
151
152 power_len = get_count_order(geo->luns_per_chnl);
153 if (1 << power_len != geo->luns_per_chnl) {
154 pr_err("pblk: supports only power-of-two LUN config.\n");
155 return -EINVAL;
156 }
157 ppaf.lun_len = power_len;
158
159 pblk->ppaf.sec_offset = 0;
160 pblk->ppaf.pln_offset = ppaf.sect_len;
161 pblk->ppaf.ch_offset = pblk->ppaf.pln_offset + ppaf.pln_len;
162 pblk->ppaf.lun_offset = pblk->ppaf.ch_offset + ppaf.ch_len;
163 pblk->ppaf.pg_offset = pblk->ppaf.lun_offset + ppaf.lun_len;
164 pblk->ppaf.blk_offset = pblk->ppaf.pg_offset + ppaf.pg_len;
165 pblk->ppaf.sec_mask = (1ULL << ppaf.sect_len) - 1;
166 pblk->ppaf.pln_mask = ((1ULL << ppaf.pln_len) - 1) <<
167 pblk->ppaf.pln_offset;
168 pblk->ppaf.ch_mask = ((1ULL << ppaf.ch_len) - 1) <<
169 pblk->ppaf.ch_offset;
170 pblk->ppaf.lun_mask = ((1ULL << ppaf.lun_len) - 1) <<
171 pblk->ppaf.lun_offset;
172 pblk->ppaf.pg_mask = ((1ULL << ppaf.pg_len) - 1) <<
173 pblk->ppaf.pg_offset;
174 pblk->ppaf.blk_mask = ((1ULL << ppaf.blk_len) - 1) <<
175 pblk->ppaf.blk_offset;
176
177 pblk->ppaf_bitsize = pblk->ppaf.blk_offset + ppaf.blk_len;
178
179 return 0;
180}
181
182static int pblk_init_global_caches(struct pblk *pblk)
183{
184 char cache_name[PBLK_CACHE_NAME_LEN];
185
186 down_write(&pblk_lock);
187 pblk_blk_ws_cache = kmem_cache_create("pblk_blk_ws",
188 sizeof(struct pblk_line_ws), 0, 0, NULL);
189 if (!pblk_blk_ws_cache) {
190 up_write(&pblk_lock);
191 return -ENOMEM;
192 }
193
194 pblk_rec_cache = kmem_cache_create("pblk_rec",
195 sizeof(struct pblk_rec_ctx), 0, 0, NULL);
196 if (!pblk_rec_cache) {
197 kmem_cache_destroy(pblk_blk_ws_cache);
198 up_write(&pblk_lock);
199 return -ENOMEM;
200 }
201
202 pblk_r_rq_cache = kmem_cache_create("pblk_r_rq", pblk_r_rq_size,
203 0, 0, NULL);
204 if (!pblk_r_rq_cache) {
205 kmem_cache_destroy(pblk_blk_ws_cache);
206 kmem_cache_destroy(pblk_rec_cache);
207 up_write(&pblk_lock);
208 return -ENOMEM;
209 }
210
211 pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
212 0, 0, NULL);
213 if (!pblk_w_rq_cache) {
214 kmem_cache_destroy(pblk_blk_ws_cache);
215 kmem_cache_destroy(pblk_rec_cache);
216 kmem_cache_destroy(pblk_r_rq_cache);
217 up_write(&pblk_lock);
218 return -ENOMEM;
219 }
220
221 snprintf(cache_name, sizeof(cache_name), "pblk_line_m_%s",
222 pblk->disk->disk_name);
223 pblk_line_meta_cache = kmem_cache_create(cache_name,
224 pblk->lm.sec_bitmap_len, 0, 0, NULL);
225 if (!pblk_line_meta_cache) {
226 kmem_cache_destroy(pblk_blk_ws_cache);
227 kmem_cache_destroy(pblk_rec_cache);
228 kmem_cache_destroy(pblk_r_rq_cache);
229 kmem_cache_destroy(pblk_w_rq_cache);
230 up_write(&pblk_lock);
231 return -ENOMEM;
232 }
233 up_write(&pblk_lock);
234
235 return 0;
236}
237
238static int pblk_core_init(struct pblk *pblk)
239{
240 struct nvm_tgt_dev *dev = pblk->dev;
241 struct nvm_geo *geo = &dev->geo;
242 int max_write_ppas;
243 int mod;
244
245 pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE);
246 max_write_ppas = pblk->min_write_pgs * geo->nr_luns;
247 pblk->max_write_pgs = (max_write_ppas < nvm_max_phys_sects(dev)) ?
248 max_write_ppas : nvm_max_phys_sects(dev);
249 pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg *
250 geo->nr_planes * geo->nr_luns;
251
252 if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
253 pr_err("pblk: cannot support device max_phys_sect\n");
254 return -EINVAL;
255 }
256
257 div_u64_rem(geo->sec_per_blk, pblk->min_write_pgs, &mod);
258 if (mod) {
259 pr_err("pblk: bad configuration of sectors/pages\n");
260 return -EINVAL;
261 }
262
263 if (pblk_init_global_caches(pblk))
264 return -ENOMEM;
265
266 pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0);
267 if (!pblk->page_pool)
268 return -ENOMEM;
269
270 pblk->line_ws_pool = mempool_create_slab_pool(geo->nr_luns,
271 pblk_blk_ws_cache);
272 if (!pblk->line_ws_pool)
273 goto free_page_pool;
274
275 pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache);
276 if (!pblk->rec_pool)
277 goto free_blk_ws_pool;
278
279 pblk->r_rq_pool = mempool_create_slab_pool(64, pblk_r_rq_cache);
280 if (!pblk->r_rq_pool)
281 goto free_rec_pool;
282
283 pblk->w_rq_pool = mempool_create_slab_pool(64, pblk_w_rq_cache);
284 if (!pblk->w_rq_pool)
285 goto free_r_rq_pool;
286
287 pblk->line_meta_pool =
288 mempool_create_slab_pool(16, pblk_line_meta_cache);
289 if (!pblk->line_meta_pool)
290 goto free_w_rq_pool;
291
292 pblk->kw_wq = alloc_workqueue("pblk-aux-wq",
293 WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
294 if (!pblk->kw_wq)
295 goto free_line_meta_pool;
296
297 if (pblk_set_ppaf(pblk))
298 goto free_kw_wq;
299
300 if (pblk_rwb_init(pblk))
301 goto free_kw_wq;
302
303 INIT_LIST_HEAD(&pblk->compl_list);
304 return 0;
305
306free_kw_wq:
307 destroy_workqueue(pblk->kw_wq);
308free_line_meta_pool:
309 mempool_destroy(pblk->line_meta_pool);
310free_w_rq_pool:
311 mempool_destroy(pblk->w_rq_pool);
312free_r_rq_pool:
313 mempool_destroy(pblk->r_rq_pool);
314free_rec_pool:
315 mempool_destroy(pblk->rec_pool);
316free_blk_ws_pool:
317 mempool_destroy(pblk->line_ws_pool);
318free_page_pool:
319 mempool_destroy(pblk->page_pool);
320 return -ENOMEM;
321}
322
323static void pblk_core_free(struct pblk *pblk)
324{
325 if (pblk->kw_wq)
326 destroy_workqueue(pblk->kw_wq);
327
328 mempool_destroy(pblk->page_pool);
329 mempool_destroy(pblk->line_ws_pool);
330 mempool_destroy(pblk->rec_pool);
331 mempool_destroy(pblk->r_rq_pool);
332 mempool_destroy(pblk->w_rq_pool);
333 mempool_destroy(pblk->line_meta_pool);
334
335 kmem_cache_destroy(pblk_blk_ws_cache);
336 kmem_cache_destroy(pblk_rec_cache);
337 kmem_cache_destroy(pblk_r_rq_cache);
338 kmem_cache_destroy(pblk_w_rq_cache);
339 kmem_cache_destroy(pblk_line_meta_cache);
340}
341
342static void pblk_luns_free(struct pblk *pblk)
343{
344 kfree(pblk->luns);
345}
346
347static void pblk_lines_free(struct pblk *pblk)
348{
349 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
350 struct pblk_line *line;
351 int i;
352
353 spin_lock(&l_mg->free_lock);
354 for (i = 0; i < l_mg->nr_lines; i++) {
355 line = &pblk->lines[i];
356
357 pblk_line_free(pblk, line);
358 kfree(line->blk_bitmap);
359 kfree(line->erase_bitmap);
360 }
361 spin_unlock(&l_mg->free_lock);
362}
363
364static void pblk_line_meta_free(struct pblk *pblk)
365{
366 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
367 int i;
368
369 kfree(l_mg->bb_template);
370 kfree(l_mg->bb_aux);
371
372 for (i = 0; i < PBLK_DATA_LINES; i++) {
373 pblk_mfree(l_mg->sline_meta[i].meta, l_mg->smeta_alloc_type);
374 pblk_mfree(l_mg->eline_meta[i].meta, l_mg->emeta_alloc_type);
375 }
376
377 kfree(pblk->lines);
378}
379
380static int pblk_bb_discovery(struct nvm_tgt_dev *dev, struct pblk_lun *rlun)
381{
382 struct nvm_geo *geo = &dev->geo;
383 struct ppa_addr ppa;
384 u8 *blks;
385 int nr_blks, ret;
386
387 nr_blks = geo->blks_per_lun * geo->plane_mode;
388 blks = kmalloc(nr_blks, GFP_KERNEL);
389 if (!blks)
390 return -ENOMEM;
391
392 ppa.ppa = 0;
393 ppa.g.ch = rlun->bppa.g.ch;
394 ppa.g.lun = rlun->bppa.g.lun;
395
396 ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
397 if (ret)
398 goto out;
399
400 nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
401 if (nr_blks < 0) {
402 kfree(blks);
403 ret = nr_blks;
404 }
405
406 rlun->bb_list = blks;
407
408out:
409 return ret;
410}
411
412static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line)
413{
414 struct pblk_line_meta *lm = &pblk->lm;
415 struct pblk_lun *rlun;
416 int bb_cnt = 0;
417 int i;
418
419 line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
420 if (!line->blk_bitmap)
421 return -ENOMEM;
422
423 line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
424 if (!line->erase_bitmap) {
425 kfree(line->blk_bitmap);
426 return -ENOMEM;
427 }
428
429 for (i = 0; i < lm->blk_per_line; i++) {
430 rlun = &pblk->luns[i];
431 if (rlun->bb_list[line->id] == NVM_BLK_T_FREE)
432 continue;
433
434 set_bit(i, line->blk_bitmap);
435 bb_cnt++;
436 }
437
438 return bb_cnt;
439}
440
441static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
442{
443 struct nvm_tgt_dev *dev = pblk->dev;
444 struct nvm_geo *geo = &dev->geo;
445 struct pblk_lun *rlun;
446 int i, ret;
447
448 /* TODO: Implement unbalanced LUN support */
449 if (geo->luns_per_chnl < 0) {
450 pr_err("pblk: unbalanced LUN config.\n");
451 return -EINVAL;
452 }
453
454 pblk->luns = kcalloc(geo->nr_luns, sizeof(struct pblk_lun), GFP_KERNEL);
455 if (!pblk->luns)
456 return -ENOMEM;
457
458 for (i = 0; i < geo->nr_luns; i++) {
459 /* Stripe across channels */
460 int ch = i % geo->nr_chnls;
461 int lun_raw = i / geo->nr_chnls;
462 int lunid = lun_raw + ch * geo->luns_per_chnl;
463
464 rlun = &pblk->luns[i];
465 rlun->bppa = luns[lunid];
466
467 sema_init(&rlun->wr_sem, 1);
468
469 ret = pblk_bb_discovery(dev, rlun);
470 if (ret) {
471 while (--i >= 0)
472 kfree(pblk->luns[i].bb_list);
473 return ret;
474 }
475 }
476
477 return 0;
478}
479
480static int pblk_lines_configure(struct pblk *pblk, int flags)
481{
482 struct pblk_line *line = NULL;
483 int ret = 0;
484
485 if (!(flags & NVM_TARGET_FACTORY)) {
486 line = pblk_recov_l2p(pblk);
487 if (IS_ERR(line)) {
488 pr_err("pblk: could not recover l2p table\n");
489 ret = -EFAULT;
490 }
491 }
492
493 if (!line) {
494 /* Configure next line for user data */
495 line = pblk_line_get_first_data(pblk);
496 if (!line) {
497 pr_err("pblk: line list corrupted\n");
498 ret = -EFAULT;
499 }
500 }
501
502 return ret;
503}
504
505/* See comment over struct line_emeta definition */
506static unsigned int calc_emeta_len(struct pblk *pblk, struct pblk_line_meta *lm)
507{
508 return (sizeof(struct line_emeta) +
509 ((lm->sec_per_line - lm->emeta_sec) * sizeof(u64)) +
510 (pblk->l_mg.nr_lines * sizeof(u32)) +
511 lm->blk_bitmap_len);
512}
513
514static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
515{
516 struct nvm_tgt_dev *dev = pblk->dev;
517 struct nvm_geo *geo = &dev->geo;
518 sector_t provisioned;
519
520 pblk->over_pct = 20;
521
522 provisioned = nr_free_blks;
523 provisioned *= (100 - pblk->over_pct);
524 sector_div(provisioned, 100);
525
526 /* Internally pblk manages all free blocks, but all calculations based
527 * on user capacity consider only provisioned blocks
528 */
529 pblk->rl.total_blocks = nr_free_blks;
530 pblk->rl.nr_secs = nr_free_blks * geo->sec_per_blk;
531 pblk->capacity = provisioned * geo->sec_per_blk;
532 atomic_set(&pblk->rl.free_blocks, nr_free_blks);
533}
534
535static int pblk_lines_init(struct pblk *pblk)
536{
537 struct nvm_tgt_dev *dev = pblk->dev;
538 struct nvm_geo *geo = &dev->geo;
539 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
540 struct pblk_line_meta *lm = &pblk->lm;
541 struct pblk_line *line;
542 unsigned int smeta_len, emeta_len;
543 long nr_bad_blks, nr_meta_blks, nr_free_blks;
544 int bb_distance;
545 int i;
546 int ret = 0;
547
548 lm->sec_per_line = geo->sec_per_blk * geo->nr_luns;
549 lm->blk_per_line = geo->nr_luns;
550 lm->blk_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long);
551 lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
552 lm->lun_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long);
553 lm->high_thrs = lm->sec_per_line / 2;
554 lm->mid_thrs = lm->sec_per_line / 4;
555
556 /* Calculate necessary pages for smeta. See comment over struct
557 * line_smeta definition
558 */
559 lm->smeta_len = sizeof(struct line_smeta) +
560 PBLK_LINE_NR_LUN_BITMAP * lm->lun_bitmap_len;
561
562 i = 1;
563add_smeta_page:
564 lm->smeta_sec = i * geo->sec_per_pl;
565 lm->smeta_len = lm->smeta_sec * geo->sec_size;
566
567 smeta_len = sizeof(struct line_smeta) +
568 PBLK_LINE_NR_LUN_BITMAP * lm->lun_bitmap_len;
569 if (smeta_len > lm->smeta_len) {
570 i++;
571 goto add_smeta_page;
572 }
573
574 /* Calculate necessary pages for emeta. See comment over struct
575 * line_emeta definition
576 */
577 i = 1;
578add_emeta_page:
579 lm->emeta_sec = i * geo->sec_per_pl;
580 lm->emeta_len = lm->emeta_sec * geo->sec_size;
581
582 emeta_len = calc_emeta_len(pblk, lm);
583 if (emeta_len > lm->emeta_len) {
584 i++;
585 goto add_emeta_page;
586 }
587 lm->emeta_bb = geo->nr_luns - i;
588
589 nr_meta_blks = (lm->smeta_sec + lm->emeta_sec +
590 (geo->sec_per_blk / 2)) / geo->sec_per_blk;
591 lm->min_blk_line = nr_meta_blks + 1;
592
593 l_mg->nr_lines = geo->blks_per_lun;
594 l_mg->log_line = l_mg->data_line = NULL;
595 l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
596 l_mg->nr_free_lines = 0;
597 bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
598
599 /* smeta is always small enough to fit on a kmalloc memory allocation,
600 * emeta depends on the number of LUNs allocated to the pblk instance
601 */
602 l_mg->smeta_alloc_type = PBLK_KMALLOC_META;
603 for (i = 0; i < PBLK_DATA_LINES; i++) {
604 l_mg->sline_meta[i].meta = kmalloc(lm->smeta_len, GFP_KERNEL);
605 if (!l_mg->sline_meta[i].meta)
606 while (--i >= 0) {
607 kfree(l_mg->sline_meta[i].meta);
608 ret = -ENOMEM;
609 goto fail;
610 }
611 }
612
613 if (lm->emeta_len > KMALLOC_MAX_CACHE_SIZE) {
614 l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
615
616 for (i = 0; i < PBLK_DATA_LINES; i++) {
617 l_mg->eline_meta[i].meta = vmalloc(lm->emeta_len);
618 if (!l_mg->eline_meta[i].meta)
619 while (--i >= 0) {
620 vfree(l_mg->eline_meta[i].meta);
621 ret = -ENOMEM;
622 goto fail;
623 }
624 }
625 } else {
626 l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
627
628 for (i = 0; i < PBLK_DATA_LINES; i++) {
629 l_mg->eline_meta[i].meta =
630 kmalloc(lm->emeta_len, GFP_KERNEL);
631 if (!l_mg->eline_meta[i].meta)
632 while (--i >= 0) {
633 kfree(l_mg->eline_meta[i].meta);
634 ret = -ENOMEM;
635 goto fail;
636 }
637 }
638 }
639
640 l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
641 if (!l_mg->bb_template)
642 goto fail_free_meta;
643
644 l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
645 if (!l_mg->bb_aux)
646 goto fail_free_bb_template;
647
648 bb_distance = (geo->nr_luns) * geo->sec_per_pl;
649 for (i = 0; i < lm->sec_per_line; i += bb_distance)
650 bitmap_set(l_mg->bb_template, i, geo->sec_per_pl);
651
652 INIT_LIST_HEAD(&l_mg->free_list);
653 INIT_LIST_HEAD(&l_mg->corrupt_list);
654 INIT_LIST_HEAD(&l_mg->bad_list);
655 INIT_LIST_HEAD(&l_mg->gc_full_list);
656 INIT_LIST_HEAD(&l_mg->gc_high_list);
657 INIT_LIST_HEAD(&l_mg->gc_mid_list);
658 INIT_LIST_HEAD(&l_mg->gc_low_list);
659 INIT_LIST_HEAD(&l_mg->gc_empty_list);
660
661 l_mg->gc_lists[0] = &l_mg->gc_high_list;
662 l_mg->gc_lists[1] = &l_mg->gc_mid_list;
663 l_mg->gc_lists[2] = &l_mg->gc_low_list;
664
665 spin_lock_init(&l_mg->free_lock);
666 spin_lock_init(&l_mg->gc_lock);
667
668 pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
669 GFP_KERNEL);
670 if (!pblk->lines)
671 goto fail_free_bb_aux;
672
673 nr_free_blks = 0;
674 for (i = 0; i < l_mg->nr_lines; i++) {
675 line = &pblk->lines[i];
676
677 line->pblk = pblk;
678 line->id = i;
679 line->type = PBLK_LINETYPE_FREE;
680 line->state = PBLK_LINESTATE_FREE;
681 line->gc_group = PBLK_LINEGC_NONE;
682 spin_lock_init(&line->lock);
683
684 nr_bad_blks = pblk_bb_line(pblk, line);
685 if (nr_bad_blks < 0 || nr_bad_blks > lm->blk_per_line)
686 goto fail_free_lines;
687
688 line->blk_in_line = lm->blk_per_line - nr_bad_blks;
689 if (line->blk_in_line < lm->min_blk_line) {
690 line->state = PBLK_LINESTATE_BAD;
691 list_add_tail(&line->list, &l_mg->bad_list);
692 continue;
693 }
694
695 nr_free_blks += line->blk_in_line;
696
697 l_mg->nr_free_lines++;
698 list_add_tail(&line->list, &l_mg->free_list);
699 }
700
701 pblk_set_provision(pblk, nr_free_blks);
702
703 sema_init(&pblk->erase_sem, 1);
704
705 /* Cleanup per-LUN bad block lists - managed within lines on run-time */
706 for (i = 0; i < geo->nr_luns; i++)
707 kfree(pblk->luns[i].bb_list);
708
709 return 0;
710fail_free_lines:
711 kfree(pblk->lines);
712fail_free_bb_aux:
713 kfree(l_mg->bb_aux);
714fail_free_bb_template:
715 kfree(l_mg->bb_template);
716fail_free_meta:
717 for (i = 0; i < PBLK_DATA_LINES; i++) {
718 pblk_mfree(l_mg->sline_meta[i].meta, l_mg->smeta_alloc_type);
719 pblk_mfree(l_mg->eline_meta[i].meta, l_mg->emeta_alloc_type);
720 }
721fail:
722 for (i = 0; i < geo->nr_luns; i++)
723 kfree(pblk->luns[i].bb_list);
724
725 return ret;
726}
727
728static int pblk_writer_init(struct pblk *pblk)
729{
730 setup_timer(&pblk->wtimer, pblk_write_timer_fn, (unsigned long)pblk);
731 mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
732
733 pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
734 if (IS_ERR(pblk->writer_ts)) {
735 pr_err("pblk: could not allocate writer kthread\n");
736 return 1;
737 }
738
739 return 0;
740}
741
742static void pblk_writer_stop(struct pblk *pblk)
743{
744 if (pblk->writer_ts)
745 kthread_stop(pblk->writer_ts);
746 del_timer(&pblk->wtimer);
747}
748
749static void pblk_free(struct pblk *pblk)
750{
751 pblk_luns_free(pblk);
752 pblk_lines_free(pblk);
753 pblk_line_meta_free(pblk);
754 pblk_core_free(pblk);
755 pblk_l2p_free(pblk);
756
757 kfree(pblk);
758}
759
760static void pblk_tear_down(struct pblk *pblk)
761{
762 pblk_flush_writer(pblk);
763 pblk_writer_stop(pblk);
764 pblk_rb_sync_l2p(&pblk->rwb);
765 pblk_recov_pad(pblk);
766 pblk_rwb_free(pblk);
767 pblk_rl_free(&pblk->rl);
768
769 pr_debug("pblk: consistent tear down\n");
770}
771
772static void pblk_exit(void *private)
773{
774 struct pblk *pblk = private;
775
776 down_write(&pblk_lock);
777 pblk_gc_exit(pblk);
778 pblk_tear_down(pblk);
779 pblk_free(pblk);
780 up_write(&pblk_lock);
781}
782
783static sector_t pblk_capacity(void *private)
784{
785 struct pblk *pblk = private;
786
787 return pblk->capacity * NR_PHY_IN_LOG;
788}
789
790static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
791 int flags)
792{
793 struct nvm_geo *geo = &dev->geo;
794 struct request_queue *bqueue = dev->q;
795 struct request_queue *tqueue = tdisk->queue;
796 struct pblk *pblk;
797 int ret;
798
799 if (dev->identity.dom & NVM_RSP_L2P) {
800 pr_err("pblk: device-side L2P table not supported. (%x)\n",
801 dev->identity.dom);
802 return ERR_PTR(-EINVAL);
803 }
804
805 pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
806 if (!pblk)
807 return ERR_PTR(-ENOMEM);
808
809 pblk->dev = dev;
810 pblk->disk = tdisk;
811
812 spin_lock_init(&pblk->trans_lock);
813 spin_lock_init(&pblk->lock);
814
815 if (flags & NVM_TARGET_FACTORY)
816 pblk_setup_uuid(pblk);
817
818#ifdef CONFIG_NVM_DEBUG
819 atomic_long_set(&pblk->inflight_writes, 0);
820 atomic_long_set(&pblk->padded_writes, 0);
821 atomic_long_set(&pblk->padded_wb, 0);
822 atomic_long_set(&pblk->nr_flush, 0);
823 atomic_long_set(&pblk->req_writes, 0);
824 atomic_long_set(&pblk->sub_writes, 0);
825 atomic_long_set(&pblk->sync_writes, 0);
826 atomic_long_set(&pblk->compl_writes, 0);
827 atomic_long_set(&pblk->inflight_reads, 0);
828 atomic_long_set(&pblk->sync_reads, 0);
829 atomic_long_set(&pblk->recov_writes, 0);
830 atomic_long_set(&pblk->recov_writes, 0);
831 atomic_long_set(&pblk->recov_gc_writes, 0);
832#endif
833
834 atomic_long_set(&pblk->read_failed, 0);
835 atomic_long_set(&pblk->read_empty, 0);
836 atomic_long_set(&pblk->read_high_ecc, 0);
837 atomic_long_set(&pblk->read_failed_gc, 0);
838 atomic_long_set(&pblk->write_failed, 0);
839 atomic_long_set(&pblk->erase_failed, 0);
840
841 ret = pblk_luns_init(pblk, dev->luns);
842 if (ret) {
843 pr_err("pblk: could not initialize luns\n");
844 goto fail;
845 }
846
847 ret = pblk_lines_init(pblk);
848 if (ret) {
849 pr_err("pblk: could not initialize lines\n");
850 goto fail_free_luns;
851 }
852
853 ret = pblk_core_init(pblk);
854 if (ret) {
855 pr_err("pblk: could not initialize core\n");
856 goto fail_free_line_meta;
857 }
858
859 ret = pblk_l2p_init(pblk);
860 if (ret) {
861 pr_err("pblk: could not initialize maps\n");
862 goto fail_free_core;
863 }
864
865 ret = pblk_lines_configure(pblk, flags);
866 if (ret) {
867 pr_err("pblk: could not configure lines\n");
868 goto fail_free_l2p;
869 }
870
871 ret = pblk_writer_init(pblk);
872 if (ret) {
873 pr_err("pblk: could not initialize write thread\n");
874 goto fail_free_lines;
875 }
876
877 ret = pblk_gc_init(pblk);
878 if (ret) {
879 pr_err("pblk: could not initialize gc\n");
880 goto fail_stop_writer;
881 }
882
883 /* inherit the size from the underlying device */
884 blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
885 blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
886
887 blk_queue_write_cache(tqueue, true, false);
888
889 tqueue->limits.discard_granularity = geo->pgs_per_blk * geo->pfpg_size;
890 tqueue->limits.discard_alignment = 0;
891 blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
892 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, tqueue);
893
894 pr_info("pblk init: luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
895 geo->nr_luns, pblk->l_mg.nr_lines,
896 (unsigned long long)pblk->rl.nr_secs,
897 pblk->rwb.nr_entries);
898
899 wake_up_process(pblk->writer_ts);
900 return pblk;
901
902fail_stop_writer:
903 pblk_writer_stop(pblk);
904fail_free_lines:
905 pblk_lines_free(pblk);
906fail_free_l2p:
907 pblk_l2p_free(pblk);
908fail_free_core:
909 pblk_core_free(pblk);
910fail_free_line_meta:
911 pblk_line_meta_free(pblk);
912fail_free_luns:
913 pblk_luns_free(pblk);
914fail:
915 kfree(pblk);
916 return ERR_PTR(ret);
917}
918
919/* physical block device target */
920static struct nvm_tgt_type tt_pblk = {
921 .name = "pblk",
922 .version = {1, 0, 0},
923
924 .make_rq = pblk_make_rq,
925 .capacity = pblk_capacity,
926
927 .init = pblk_init,
928 .exit = pblk_exit,
929
930 .sysfs_init = pblk_sysfs_init,
931 .sysfs_exit = pblk_sysfs_exit,
932};
933
934static int __init pblk_module_init(void)
935{
936 return nvm_register_tgt_type(&tt_pblk);
937}
938
939static void pblk_module_exit(void)
940{
941 nvm_unregister_tgt_type(&tt_pblk);
942}
943
944module_init(pblk_module_init);
945module_exit(pblk_module_exit);
946MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
947MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
948MODULE_LICENSE("GPL v2");
949MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-27 11:09:33 -0400