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xtensa: support DMA buffers in high memory
[cris-mirror.git] / drivers / lightnvm / pblk-init.c
blob93d671ca518e208b81c70fd5c276d1093487b918
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
23 static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
24 *pblk_w_rq_cache;
25 static DECLARE_RWSEM(pblk_lock);
26 struct bio_set *pblk_bio_set;
27
28 static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
29 struct bio *bio)
30 {
31 int ret;
32
33 /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
34 * constraint. Writes can be of arbitrary size.
35 */
36 if (bio_data_dir(bio) == READ) {
37 blk_queue_split(q, &bio);
38 ret = pblk_submit_read(pblk, bio);
39 if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
40 bio_put(bio);
41
42 return ret;
43 }
44
45 /* Prevent deadlock in the case of a modest LUN configuration and large
46 * user I/Os. Unless stalled, the rate limiter leaves at least 256KB
47 * available for user I/O.
48 */
49 if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
50 blk_queue_split(q, &bio);
51
52 return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
53 }
54
55 static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
56 {
57 struct pblk *pblk = q->queuedata;
58
59 if (bio_op(bio) == REQ_OP_DISCARD) {
60 pblk_discard(pblk, bio);
61 if (!(bio->bi_opf & REQ_PREFLUSH)) {
62 bio_endio(bio);
63 return BLK_QC_T_NONE;
64 }
65 }
66
67 switch (pblk_rw_io(q, pblk, bio)) {
68 case NVM_IO_ERR:
69 bio_io_error(bio);
70 break;
71 case NVM_IO_DONE:
72 bio_endio(bio);
73 break;
74 }
75
76 return BLK_QC_T_NONE;
77 }
78
79 static size_t pblk_trans_map_size(struct pblk *pblk)
80 {
81 int entry_size = 8;
82
83 if (pblk->ppaf_bitsize < 32)
84 entry_size = 4;
85
86 return entry_size * pblk->rl.nr_secs;
87 }
88
89 #ifdef CONFIG_NVM_DEBUG
90 static u32 pblk_l2p_crc(struct pblk *pblk)
91 {
92 size_t map_size;
93 u32 crc = ~(u32)0;
94
95 map_size = pblk_trans_map_size(pblk);
96 crc = crc32_le(crc, pblk->trans_map, map_size);
97 return crc;
98 }
99 #endif
100
101 static void pblk_l2p_free(struct pblk *pblk)
102 {
103 vfree(pblk->trans_map);
104 }
105
106 static int pblk_l2p_init(struct pblk *pblk)
107 {
108 sector_t i;
109 struct ppa_addr ppa;
110 size_t map_size;
111
112 map_size = pblk_trans_map_size(pblk);
113 pblk->trans_map = vmalloc(map_size);
114 if (!pblk->trans_map)
115 return -ENOMEM;
116
117 pblk_ppa_set_empty(&ppa);
118
119 for (i = 0; i < pblk->rl.nr_secs; i++)
120 pblk_trans_map_set(pblk, i, ppa);
121
122 return 0;
123 }
124
125 static void pblk_rwb_free(struct pblk *pblk)
126 {
127 if (pblk_rb_tear_down_check(&pblk->rwb))
128 pr_err("pblk: write buffer error on tear down\n");
129
130 pblk_rb_data_free(&pblk->rwb);
131 vfree(pblk_rb_entries_ref(&pblk->rwb));
132 }
133
134 static int pblk_rwb_init(struct pblk *pblk)
135 {
136 struct nvm_tgt_dev *dev = pblk->dev;
137 struct nvm_geo *geo = &dev->geo;
138 struct pblk_rb_entry *entries;
139 unsigned long nr_entries;
140 unsigned int power_size, power_seg_sz;
141
142 nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer);
143
144 entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry));
145 if (!entries)
146 return -ENOMEM;
147
148 power_size = get_count_order(nr_entries);
149 power_seg_sz = get_count_order(geo->sec_size);
150
151 return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
152 }
153
154 /* Minimum pages needed within a lun */
155 #define ADDR_POOL_SIZE 64
156
157 static int pblk_set_ppaf(struct pblk *pblk)
158 {
159 struct nvm_tgt_dev *dev = pblk->dev;
160 struct nvm_geo *geo = &dev->geo;
161 struct nvm_addr_format ppaf = geo->ppaf;
162 int power_len;
163
164 /* Re-calculate channel and lun format to adapt to configuration */
165 power_len = get_count_order(geo->nr_chnls);
166 if (1 << power_len != geo->nr_chnls) {
167 pr_err("pblk: supports only power-of-two channel config.\n");
168 return -EINVAL;
169 }
170 ppaf.ch_len = power_len;
171
172 power_len = get_count_order(geo->nr_luns);
173 if (1 << power_len != geo->nr_luns) {
174 pr_err("pblk: supports only power-of-two LUN config.\n");
175 return -EINVAL;
176 }
177 ppaf.lun_len = power_len;
178
179 pblk->ppaf.sec_offset = 0;
180 pblk->ppaf.pln_offset = ppaf.sect_len;
181 pblk->ppaf.ch_offset = pblk->ppaf.pln_offset + ppaf.pln_len;
182 pblk->ppaf.lun_offset = pblk->ppaf.ch_offset + ppaf.ch_len;
183 pblk->ppaf.pg_offset = pblk->ppaf.lun_offset + ppaf.lun_len;
184 pblk->ppaf.blk_offset = pblk->ppaf.pg_offset + ppaf.pg_len;
185 pblk->ppaf.sec_mask = (1ULL << ppaf.sect_len) - 1;
186 pblk->ppaf.pln_mask = ((1ULL << ppaf.pln_len) - 1) <<
187 pblk->ppaf.pln_offset;
188 pblk->ppaf.ch_mask = ((1ULL << ppaf.ch_len) - 1) <<
189 pblk->ppaf.ch_offset;
190 pblk->ppaf.lun_mask = ((1ULL << ppaf.lun_len) - 1) <<
191 pblk->ppaf.lun_offset;
192 pblk->ppaf.pg_mask = ((1ULL << ppaf.pg_len) - 1) <<
193 pblk->ppaf.pg_offset;
194 pblk->ppaf.blk_mask = ((1ULL << ppaf.blk_len) - 1) <<
195 pblk->ppaf.blk_offset;
196
197 pblk->ppaf_bitsize = pblk->ppaf.blk_offset + ppaf.blk_len;
198
199 return 0;
200 }
201
202 static int pblk_init_global_caches(struct pblk *pblk)
203 {
204 down_write(&pblk_lock);
205 pblk_ws_cache = kmem_cache_create("pblk_blk_ws",
206 sizeof(struct pblk_line_ws), 0, 0, NULL);
207 if (!pblk_ws_cache) {
208 up_write(&pblk_lock);
209 return -ENOMEM;
210 }
211
212 pblk_rec_cache = kmem_cache_create("pblk_rec",
213 sizeof(struct pblk_rec_ctx), 0, 0, NULL);
214 if (!pblk_rec_cache) {
215 kmem_cache_destroy(pblk_ws_cache);
216 up_write(&pblk_lock);
217 return -ENOMEM;
218 }
219
220 pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
221 0, 0, NULL);
222 if (!pblk_g_rq_cache) {
223 kmem_cache_destroy(pblk_ws_cache);
224 kmem_cache_destroy(pblk_rec_cache);
225 up_write(&pblk_lock);
226 return -ENOMEM;
227 }
228
229 pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
230 0, 0, NULL);
231 if (!pblk_w_rq_cache) {
232 kmem_cache_destroy(pblk_ws_cache);
233 kmem_cache_destroy(pblk_rec_cache);
234 kmem_cache_destroy(pblk_g_rq_cache);
235 up_write(&pblk_lock);
236 return -ENOMEM;
237 }
238 up_write(&pblk_lock);
239
240 return 0;
241 }
242
243 static void pblk_free_global_caches(struct pblk *pblk)
244 {
245 kmem_cache_destroy(pblk_ws_cache);
246 kmem_cache_destroy(pblk_rec_cache);
247 kmem_cache_destroy(pblk_g_rq_cache);
248 kmem_cache_destroy(pblk_w_rq_cache);
249 }
250
251 static int pblk_core_init(struct pblk *pblk)
252 {
253 struct nvm_tgt_dev *dev = pblk->dev;
254 struct nvm_geo *geo = &dev->geo;
255
256 pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg *
257 geo->nr_planes * geo->all_luns;
258
259 if (pblk_init_global_caches(pblk))
260 return -ENOMEM;
261
262 /* Internal bios can be at most the sectors signaled by the device. */
263 pblk->page_bio_pool = mempool_create_page_pool(nvm_max_phys_sects(dev),
264 0);
265 if (!pblk->page_bio_pool)
266 goto free_global_caches;
267
268 pblk->gen_ws_pool = mempool_create_slab_pool(PBLK_GEN_WS_POOL_SIZE,
269 pblk_ws_cache);
270 if (!pblk->gen_ws_pool)
271 goto free_page_bio_pool;
272
273 pblk->rec_pool = mempool_create_slab_pool(geo->all_luns,
274 pblk_rec_cache);
275 if (!pblk->rec_pool)
276 goto free_gen_ws_pool;
277
278 pblk->r_rq_pool = mempool_create_slab_pool(geo->all_luns,
279 pblk_g_rq_cache);
280 if (!pblk->r_rq_pool)
281 goto free_rec_pool;
282
283 pblk->e_rq_pool = mempool_create_slab_pool(geo->all_luns,
284 pblk_g_rq_cache);
285 if (!pblk->e_rq_pool)
286 goto free_r_rq_pool;
287
288 pblk->w_rq_pool = mempool_create_slab_pool(geo->all_luns,
289 pblk_w_rq_cache);
290 if (!pblk->w_rq_pool)
291 goto free_e_rq_pool;
292
293 pblk->close_wq = alloc_workqueue("pblk-close-wq",
294 WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
295 if (!pblk->close_wq)
296 goto free_w_rq_pool;
297
298 pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
299 WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
300 if (!pblk->bb_wq)
301 goto free_close_wq;
302
303 pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
304 WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
305 if (!pblk->r_end_wq)
306 goto free_bb_wq;
307
308 if (pblk_set_ppaf(pblk))
309 goto free_r_end_wq;
310
311 if (pblk_rwb_init(pblk))
312 goto free_r_end_wq;
313
314 INIT_LIST_HEAD(&pblk->compl_list);
315 return 0;
316
317 free_r_end_wq:
318 destroy_workqueue(pblk->r_end_wq);
319 free_bb_wq:
320 destroy_workqueue(pblk->bb_wq);
321 free_close_wq:
322 destroy_workqueue(pblk->close_wq);
323 free_w_rq_pool:
324 mempool_destroy(pblk->w_rq_pool);
325 free_e_rq_pool:
326 mempool_destroy(pblk->e_rq_pool);
327 free_r_rq_pool:
328 mempool_destroy(pblk->r_rq_pool);
329 free_rec_pool:
330 mempool_destroy(pblk->rec_pool);
331 free_gen_ws_pool:
332 mempool_destroy(pblk->gen_ws_pool);
333 free_page_bio_pool:
334 mempool_destroy(pblk->page_bio_pool);
335 free_global_caches:
336 pblk_free_global_caches(pblk);
337 return -ENOMEM;
338 }
339
340 static void pblk_core_free(struct pblk *pblk)
341 {
342 if (pblk->close_wq)
343 destroy_workqueue(pblk->close_wq);
344
345 if (pblk->r_end_wq)
346 destroy_workqueue(pblk->r_end_wq);
347
348 if (pblk->bb_wq)
349 destroy_workqueue(pblk->bb_wq);
350
351 mempool_destroy(pblk->page_bio_pool);
352 mempool_destroy(pblk->gen_ws_pool);
353 mempool_destroy(pblk->rec_pool);
354 mempool_destroy(pblk->r_rq_pool);
355 mempool_destroy(pblk->e_rq_pool);
356 mempool_destroy(pblk->w_rq_pool);
357
358 pblk_rwb_free(pblk);
359
360 pblk_free_global_caches(pblk);
361 }
362
363 static void pblk_luns_free(struct pblk *pblk)
364 {
365 kfree(pblk->luns);
366 }
367
368 static void pblk_free_line_bitmaps(struct pblk_line *line)
369 {
370 kfree(line->blk_bitmap);
371 kfree(line->erase_bitmap);
372 }
373
374 static void pblk_lines_free(struct pblk *pblk)
375 {
376 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
377 struct pblk_line *line;
378 int i;
379
380 spin_lock(&l_mg->free_lock);
381 for (i = 0; i < l_mg->nr_lines; i++) {
382 line = &pblk->lines[i];
383
384 pblk_line_free(pblk, line);
385 pblk_free_line_bitmaps(line);
386 }
387 spin_unlock(&l_mg->free_lock);
388 }
389
390 static void pblk_line_meta_free(struct pblk *pblk)
391 {
392 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
393 int i;
394
395 kfree(l_mg->bb_template);
396 kfree(l_mg->bb_aux);
397 kfree(l_mg->vsc_list);
398
399 for (i = 0; i < PBLK_DATA_LINES; i++) {
400 kfree(l_mg->sline_meta[i]);
401 pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
402 kfree(l_mg->eline_meta[i]);
403 }
404
405 kfree(pblk->lines);
406 }
407
408 static int pblk_bb_discovery(struct nvm_tgt_dev *dev, struct pblk_lun *rlun)
409 {
410 struct nvm_geo *geo = &dev->geo;
411 struct ppa_addr ppa;
412 u8 *blks;
413 int nr_blks, ret;
414
415 nr_blks = geo->nr_chks * geo->plane_mode;
416 blks = kmalloc(nr_blks, GFP_KERNEL);
417 if (!blks)
418 return -ENOMEM;
419
420 ppa.ppa = 0;
421 ppa.g.ch = rlun->bppa.g.ch;
422 ppa.g.lun = rlun->bppa.g.lun;
423
424 ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
425 if (ret)
426 goto out;
427
428 nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
429 if (nr_blks < 0) {
430 ret = nr_blks;
431 goto out;
432 }
433
434 rlun->bb_list = blks;
435
436 return 0;
437 out:
438 kfree(blks);
439 return ret;
440 }
441
442 static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line,
443 int blk_per_line)
444 {
445 struct nvm_tgt_dev *dev = pblk->dev;
446 struct nvm_geo *geo = &dev->geo;
447 struct pblk_lun *rlun;
448 int bb_cnt = 0;
449 int i;
450
451 for (i = 0; i < blk_per_line; i++) {
452 rlun = &pblk->luns[i];
453 if (rlun->bb_list[line->id] == NVM_BLK_T_FREE)
454 continue;
455
456 set_bit(pblk_ppa_to_pos(geo, rlun->bppa), line->blk_bitmap);
457 bb_cnt++;
458 }
459
460 return bb_cnt;
461 }
462
463 static int pblk_alloc_line_bitmaps(struct pblk *pblk, struct pblk_line *line)
464 {
465 struct pblk_line_meta *lm = &pblk->lm;
466
467 line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
468 if (!line->blk_bitmap)
469 return -ENOMEM;
470
471 line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
472 if (!line->erase_bitmap) {
473 kfree(line->blk_bitmap);
474 return -ENOMEM;
475 }
476
477 return 0;
478 }
479
480 static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
481 {
482 struct nvm_tgt_dev *dev = pblk->dev;
483 struct nvm_geo *geo = &dev->geo;
484 struct pblk_lun *rlun;
485 int i, ret;
486
487 /* TODO: Implement unbalanced LUN support */
488 if (geo->nr_luns < 0) {
489 pr_err("pblk: unbalanced LUN config.\n");
490 return -EINVAL;
491 }
492
493 pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
494 GFP_KERNEL);
495 if (!pblk->luns)
496 return -ENOMEM;
497
498 for (i = 0; i < geo->all_luns; i++) {
499 /* Stripe across channels */
500 int ch = i % geo->nr_chnls;
501 int lun_raw = i / geo->nr_chnls;
502 int lunid = lun_raw + ch * geo->nr_luns;
503
504 rlun = &pblk->luns[i];
505 rlun->bppa = luns[lunid];
506
507 sema_init(&rlun->wr_sem, 1);
508
509 ret = pblk_bb_discovery(dev, rlun);
510 if (ret) {
511 while (--i >= 0)
512 kfree(pblk->luns[i].bb_list);
513 return ret;
514 }
515 }
516
517 return 0;
518 }
519
520 static int pblk_lines_configure(struct pblk *pblk, int flags)
521 {
522 struct pblk_line *line = NULL;
523 int ret = 0;
524
525 if (!(flags & NVM_TARGET_FACTORY)) {
526 line = pblk_recov_l2p(pblk);
527 if (IS_ERR(line)) {
528 pr_err("pblk: could not recover l2p table\n");
529 ret = -EFAULT;
530 }
531 }
532
533 #ifdef CONFIG_NVM_DEBUG
534 pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
535 #endif
536
537 /* Free full lines directly as GC has not been started yet */
538 pblk_gc_free_full_lines(pblk);
539
540 if (!line) {
541 /* Configure next line for user data */
542 line = pblk_line_get_first_data(pblk);
543 if (!line) {
544 pr_err("pblk: line list corrupted\n");
545 ret = -EFAULT;
546 }
547 }
548
549 return ret;
550 }
551
552 /* See comment over struct line_emeta definition */
553 static unsigned int calc_emeta_len(struct pblk *pblk)
554 {
555 struct pblk_line_meta *lm = &pblk->lm;
556 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
557 struct nvm_tgt_dev *dev = pblk->dev;
558 struct nvm_geo *geo = &dev->geo;
559
560 /* Round to sector size so that lba_list starts on its own sector */
561 lm->emeta_sec[1] = DIV_ROUND_UP(
562 sizeof(struct line_emeta) + lm->blk_bitmap_len,
563 geo->sec_size);
564 lm->emeta_len[1] = lm->emeta_sec[1] * geo->sec_size;
565
566 /* Round to sector size so that vsc_list starts on its own sector */
567 lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
568 lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
569 geo->sec_size);
570 lm->emeta_len[2] = lm->emeta_sec[2] * geo->sec_size;
571
572 lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
573 geo->sec_size);
574 lm->emeta_len[3] = lm->emeta_sec[3] * geo->sec_size;
575
576 lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);
577
578 return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
579 }
580
581 static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
582 {
583 struct nvm_tgt_dev *dev = pblk->dev;
584 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
585 struct pblk_line_meta *lm = &pblk->lm;
586 struct nvm_geo *geo = &dev->geo;
587 sector_t provisioned;
588 int sec_meta, blk_meta;
589
590 if (geo->op == NVM_TARGET_DEFAULT_OP)
591 pblk->op = PBLK_DEFAULT_OP;
592 else
593 pblk->op = geo->op;
594
595 provisioned = nr_free_blks;
596 provisioned *= (100 - pblk->op);
597 sector_div(provisioned, 100);
598
599 pblk->op_blks = nr_free_blks - provisioned;
600
601 /* Internally pblk manages all free blocks, but all calculations based
602 * on user capacity consider only provisioned blocks
603 */
604 pblk->rl.total_blocks = nr_free_blks;
605 pblk->rl.nr_secs = nr_free_blks * geo->sec_per_chk;
606
607 /* Consider sectors used for metadata */
608 sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
609 blk_meta = DIV_ROUND_UP(sec_meta, geo->sec_per_chk);
610
611 pblk->capacity = (provisioned - blk_meta) * geo->sec_per_chk;
612
613 atomic_set(&pblk->rl.free_blocks, nr_free_blks);
614 atomic_set(&pblk->rl.free_user_blocks, nr_free_blks);
615 }
616
617 static int pblk_lines_alloc_metadata(struct pblk *pblk)
618 {
619 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
620 struct pblk_line_meta *lm = &pblk->lm;
621 int i;
622
623 /* smeta is always small enough to fit on a kmalloc memory allocation,
624 * emeta depends on the number of LUNs allocated to the pblk instance
625 */
626 for (i = 0; i < PBLK_DATA_LINES; i++) {
627 l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
628 if (!l_mg->sline_meta[i])
629 goto fail_free_smeta;
630 }
631
632 /* emeta allocates three different buffers for managing metadata with
633 * in-memory and in-media layouts
634 */
635 for (i = 0; i < PBLK_DATA_LINES; i++) {
636 struct pblk_emeta *emeta;
637
638 emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
639 if (!emeta)
640 goto fail_free_emeta;
641
642 if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
643 l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
644
645 emeta->buf = vmalloc(lm->emeta_len[0]);
646 if (!emeta->buf) {
647 kfree(emeta);
648 goto fail_free_emeta;
649 }
650
651 emeta->nr_entries = lm->emeta_sec[0];
652 l_mg->eline_meta[i] = emeta;
653 } else {
654 l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
655
656 emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
657 if (!emeta->buf) {
658 kfree(emeta);
659 goto fail_free_emeta;
660 }
661
662 emeta->nr_entries = lm->emeta_sec[0];
663 l_mg->eline_meta[i] = emeta;
664 }
665 }
666
667 l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
668 if (!l_mg->vsc_list)
669 goto fail_free_emeta;
670
671 for (i = 0; i < l_mg->nr_lines; i++)
672 l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
673
674 return 0;
675
676 fail_free_emeta:
677 while (--i >= 0) {
678 if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
679 vfree(l_mg->eline_meta[i]->buf);
680 else
681 kfree(l_mg->eline_meta[i]->buf);
682 kfree(l_mg->eline_meta[i]);
683 }
684
685 fail_free_smeta:
686 for (i = 0; i < PBLK_DATA_LINES; i++)
687 kfree(l_mg->sline_meta[i]);
688
689 return -ENOMEM;
690 }
691
692 static int pblk_lines_init(struct pblk *pblk)
693 {
694 struct nvm_tgt_dev *dev = pblk->dev;
695 struct nvm_geo *geo = &dev->geo;
696 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
697 struct pblk_line_meta *lm = &pblk->lm;
698 struct pblk_line *line;
699 unsigned int smeta_len, emeta_len;
700 long nr_bad_blks, nr_free_blks;
701 int bb_distance, max_write_ppas, mod;
702 int i, ret;
703
704 pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE);
705 max_write_ppas = pblk->min_write_pgs * geo->all_luns;
706 pblk->max_write_pgs = (max_write_ppas < nvm_max_phys_sects(dev)) ?
707 max_write_ppas : nvm_max_phys_sects(dev);
708 pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
709
710 if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
711 pr_err("pblk: cannot support device max_phys_sect\n");
712 return -EINVAL;
713 }
714
715 div_u64_rem(geo->sec_per_chk, pblk->min_write_pgs, &mod);
716 if (mod) {
717 pr_err("pblk: bad configuration of sectors/pages\n");
718 return -EINVAL;
719 }
720
721 l_mg->nr_lines = geo->nr_chks;
722 l_mg->log_line = l_mg->data_line = NULL;
723 l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
724 l_mg->nr_free_lines = 0;
725 bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
726
727 lm->sec_per_line = geo->sec_per_chk * geo->all_luns;
728 lm->blk_per_line = geo->all_luns;
729 lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
730 lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
731 lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
732 lm->mid_thrs = lm->sec_per_line / 2;
733 lm->high_thrs = lm->sec_per_line / 4;
734 lm->meta_distance = (geo->all_luns / 2) * pblk->min_write_pgs;
735
736 /* Calculate necessary pages for smeta. See comment over struct
737 * line_smeta definition
738 */
739 i = 1;
740 add_smeta_page:
741 lm->smeta_sec = i * geo->sec_per_pl;
742 lm->smeta_len = lm->smeta_sec * geo->sec_size;
743
744 smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
745 if (smeta_len > lm->smeta_len) {
746 i++;
747 goto add_smeta_page;
748 }
749
750 /* Calculate necessary pages for emeta. See comment over struct
751 * line_emeta definition
752 */
753 i = 1;
754 add_emeta_page:
755 lm->emeta_sec[0] = i * geo->sec_per_pl;
756 lm->emeta_len[0] = lm->emeta_sec[0] * geo->sec_size;
757
758 emeta_len = calc_emeta_len(pblk);
759 if (emeta_len > lm->emeta_len[0]) {
760 i++;
761 goto add_emeta_page;
762 }
763
764 lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;
765
766 lm->min_blk_line = 1;
767 if (geo->all_luns > 1)
768 lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
769 lm->emeta_sec[0], geo->sec_per_chk);
770
771 if (lm->min_blk_line > lm->blk_per_line) {
772 pr_err("pblk: config. not supported. Min. LUN in line:%d\n",
773 lm->blk_per_line);
774 ret = -EINVAL;
775 goto fail;
776 }
777
778 ret = pblk_lines_alloc_metadata(pblk);
779 if (ret)
780 goto fail;
781
782 l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
783 if (!l_mg->bb_template) {
784 ret = -ENOMEM;
785 goto fail_free_meta;
786 }
787
788 l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
789 if (!l_mg->bb_aux) {
790 ret = -ENOMEM;
791 goto fail_free_bb_template;
792 }
793
794 bb_distance = (geo->all_luns) * geo->sec_per_pl;
795 for (i = 0; i < lm->sec_per_line; i += bb_distance)
796 bitmap_set(l_mg->bb_template, i, geo->sec_per_pl);
797
798 INIT_LIST_HEAD(&l_mg->free_list);
799 INIT_LIST_HEAD(&l_mg->corrupt_list);
800 INIT_LIST_HEAD(&l_mg->bad_list);
801 INIT_LIST_HEAD(&l_mg->gc_full_list);
802 INIT_LIST_HEAD(&l_mg->gc_high_list);
803 INIT_LIST_HEAD(&l_mg->gc_mid_list);
804 INIT_LIST_HEAD(&l_mg->gc_low_list);
805 INIT_LIST_HEAD(&l_mg->gc_empty_list);
806
807 INIT_LIST_HEAD(&l_mg->emeta_list);
808
809 l_mg->gc_lists[0] = &l_mg->gc_high_list;
810 l_mg->gc_lists[1] = &l_mg->gc_mid_list;
811 l_mg->gc_lists[2] = &l_mg->gc_low_list;
812
813 spin_lock_init(&l_mg->free_lock);
814 spin_lock_init(&l_mg->close_lock);
815 spin_lock_init(&l_mg->gc_lock);
816
817 pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
818 GFP_KERNEL);
819 if (!pblk->lines) {
820 ret = -ENOMEM;
821 goto fail_free_bb_aux;
822 }
823
824 nr_free_blks = 0;
825 for (i = 0; i < l_mg->nr_lines; i++) {
826 int blk_in_line;
827
828 line = &pblk->lines[i];
829
830 line->pblk = pblk;
831 line->id = i;
832 line->type = PBLK_LINETYPE_FREE;
833 line->state = PBLK_LINESTATE_FREE;
834 line->gc_group = PBLK_LINEGC_NONE;
835 line->vsc = &l_mg->vsc_list[i];
836 spin_lock_init(&line->lock);
837
838 ret = pblk_alloc_line_bitmaps(pblk, line);
839 if (ret)
840 goto fail_free_lines;
841
842 nr_bad_blks = pblk_bb_line(pblk, line, lm->blk_per_line);
843 if (nr_bad_blks < 0 || nr_bad_blks > lm->blk_per_line) {
844 pblk_free_line_bitmaps(line);
845 ret = -EINVAL;
846 goto fail_free_lines;
847 }
848
849 blk_in_line = lm->blk_per_line - nr_bad_blks;
850 if (blk_in_line < lm->min_blk_line) {
851 line->state = PBLK_LINESTATE_BAD;
852 list_add_tail(&line->list, &l_mg->bad_list);
853 continue;
854 }
855
856 nr_free_blks += blk_in_line;
857 atomic_set(&line->blk_in_line, blk_in_line);
858
859 l_mg->nr_free_lines++;
860 list_add_tail(&line->list, &l_mg->free_list);
861 }
862
863 pblk_set_provision(pblk, nr_free_blks);
864
865 /* Cleanup per-LUN bad block lists - managed within lines on run-time */
866 for (i = 0; i < geo->all_luns; i++)
867 kfree(pblk->luns[i].bb_list);
868
869 return 0;
870 fail_free_lines:
871 while (--i >= 0)
872 pblk_free_line_bitmaps(&pblk->lines[i]);
873 fail_free_bb_aux:
874 kfree(l_mg->bb_aux);
875 fail_free_bb_template:
876 kfree(l_mg->bb_template);
877 fail_free_meta:
878 pblk_line_meta_free(pblk);
879 fail:
880 for (i = 0; i < geo->all_luns; i++)
881 kfree(pblk->luns[i].bb_list);
882
883 return ret;
884 }
885
886 static int pblk_writer_init(struct pblk *pblk)
887 {
888 pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
889 if (IS_ERR(pblk->writer_ts)) {
890 int err = PTR_ERR(pblk->writer_ts);
891
892 if (err != -EINTR)
893 pr_err("pblk: could not allocate writer kthread (%d)\n",
894 err);
895 return err;
896 }
897
898 timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
899 mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
900
901 return 0;
902 }
903
904 static void pblk_writer_stop(struct pblk *pblk)
905 {
906 /* The pipeline must be stopped and the write buffer emptied before the
907 * write thread is stopped
908 */
909 WARN(pblk_rb_read_count(&pblk->rwb),
910 "Stopping not fully persisted write buffer\n");
911
912 WARN(pblk_rb_sync_count(&pblk->rwb),
913 "Stopping not fully synced write buffer\n");
914
915 if (pblk->writer_ts)
916 kthread_stop(pblk->writer_ts);
917 del_timer(&pblk->wtimer);
918 }
919
920 static void pblk_free(struct pblk *pblk)
921 {
922 pblk_luns_free(pblk);
923 pblk_lines_free(pblk);
924 pblk_line_meta_free(pblk);
925 pblk_core_free(pblk);
926 pblk_l2p_free(pblk);
927
928 kfree(pblk);
929 }
930
931 static void pblk_tear_down(struct pblk *pblk)
932 {
933 pblk_pipeline_stop(pblk);
934 pblk_writer_stop(pblk);
935 pblk_rb_sync_l2p(&pblk->rwb);
936 pblk_rl_free(&pblk->rl);
937
938 pr_debug("pblk: consistent tear down\n");
939 }
940
941 static void pblk_exit(void *private)
942 {
943 struct pblk *pblk = private;
944
945 down_write(&pblk_lock);
946 pblk_gc_exit(pblk);
947 pblk_tear_down(pblk);
948
949 #ifdef CONFIG_NVM_DEBUG
950 pr_info("pblk exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
951 #endif
952
953 pblk_free(pblk);
954 up_write(&pblk_lock);
955 }
956
957 static sector_t pblk_capacity(void *private)
958 {
959 struct pblk *pblk = private;
960
961 return pblk->capacity * NR_PHY_IN_LOG;
962 }
963
964 static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
965 int flags)
966 {
967 struct nvm_geo *geo = &dev->geo;
968 struct request_queue *bqueue = dev->q;
969 struct request_queue *tqueue = tdisk->queue;
970 struct pblk *pblk;
971 int ret;
972
973 if (dev->identity.dom & NVM_RSP_L2P) {
974 pr_err("pblk: host-side L2P table not supported. (%x)\n",
975 dev->identity.dom);
976 return ERR_PTR(-EINVAL);
977 }
978
979 pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
980 if (!pblk)
981 return ERR_PTR(-ENOMEM);
982
983 pblk->dev = dev;
984 pblk->disk = tdisk;
985 pblk->state = PBLK_STATE_RUNNING;
986 pblk->gc.gc_enabled = 0;
987
988 spin_lock_init(&pblk->trans_lock);
989 spin_lock_init(&pblk->lock);
990
991 if (flags & NVM_TARGET_FACTORY)
992 pblk_setup_uuid(pblk);
993
994 #ifdef CONFIG_NVM_DEBUG
995 atomic_long_set(&pblk->inflight_writes, 0);
996 atomic_long_set(&pblk->padded_writes, 0);
997 atomic_long_set(&pblk->padded_wb, 0);
998 atomic_long_set(&pblk->nr_flush, 0);
999 atomic_long_set(&pblk->req_writes, 0);
1000 atomic_long_set(&pblk->sub_writes, 0);
1001 atomic_long_set(&pblk->sync_writes, 0);
1002 atomic_long_set(&pblk->inflight_reads, 0);
1003 atomic_long_set(&pblk->cache_reads, 0);
1004 atomic_long_set(&pblk->sync_reads, 0);
1005 atomic_long_set(&pblk->recov_writes, 0);
1006 atomic_long_set(&pblk->recov_writes, 0);
1007 atomic_long_set(&pblk->recov_gc_writes, 0);
1008 atomic_long_set(&pblk->recov_gc_reads, 0);
1009 #endif
1010
1011 atomic_long_set(&pblk->read_failed, 0);
1012 atomic_long_set(&pblk->read_empty, 0);
1013 atomic_long_set(&pblk->read_high_ecc, 0);
1014 atomic_long_set(&pblk->read_failed_gc, 0);
1015 atomic_long_set(&pblk->write_failed, 0);
1016 atomic_long_set(&pblk->erase_failed, 0);
1017
1018 ret = pblk_luns_init(pblk, dev->luns);
1019 if (ret) {
1020 pr_err("pblk: could not initialize luns\n");
1021 goto fail;
1022 }
1023
1024 ret = pblk_lines_init(pblk);
1025 if (ret) {
1026 pr_err("pblk: could not initialize lines\n");
1027 goto fail_free_luns;
1028 }
1029
1030 ret = pblk_core_init(pblk);
1031 if (ret) {
1032 pr_err("pblk: could not initialize core\n");
1033 goto fail_free_line_meta;
1034 }
1035
1036 ret = pblk_l2p_init(pblk);
1037 if (ret) {
1038 pr_err("pblk: could not initialize maps\n");
1039 goto fail_free_core;
1040 }
1041
1042 ret = pblk_lines_configure(pblk, flags);
1043 if (ret) {
1044 pr_err("pblk: could not configure lines\n");
1045 goto fail_free_l2p;
1046 }
1047
1048 ret = pblk_writer_init(pblk);
1049 if (ret) {
1050 if (ret != -EINTR)
1051 pr_err("pblk: could not initialize write thread\n");
1052 goto fail_free_lines;
1053 }
1054
1055 ret = pblk_gc_init(pblk);
1056 if (ret) {
1057 pr_err("pblk: could not initialize gc\n");
1058 goto fail_stop_writer;
1059 }
1060
1061 /* inherit the size from the underlying device */
1062 blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
1063 blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
1064
1065 blk_queue_write_cache(tqueue, true, false);
1066
1067 tqueue->limits.discard_granularity = geo->sec_per_chk * geo->sec_size;
1068 tqueue->limits.discard_alignment = 0;
1069 blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
1070 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, tqueue);
1071
1072 pr_info("pblk(%s): luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
1073 tdisk->disk_name,
1074 geo->all_luns, pblk->l_mg.nr_lines,
1075 (unsigned long long)pblk->rl.nr_secs,
1076 pblk->rwb.nr_entries);
1077
1078 wake_up_process(pblk->writer_ts);
1079
1080 /* Check if we need to start GC */
1081 pblk_gc_should_kick(pblk);
1082
1083 return pblk;
1084
1085 fail_stop_writer:
1086 pblk_writer_stop(pblk);
1087 fail_free_lines:
1088 pblk_lines_free(pblk);
1089 fail_free_l2p:
1090 pblk_l2p_free(pblk);
1091 fail_free_core:
1092 pblk_core_free(pblk);
1093 fail_free_line_meta:
1094 pblk_line_meta_free(pblk);
1095 fail_free_luns:
1096 pblk_luns_free(pblk);
1097 fail:
1098 kfree(pblk);
1099 return ERR_PTR(ret);
1100 }
1101
1102 /* physical block device target */
1103 static struct nvm_tgt_type tt_pblk = {
1104 .name = "pblk",
1105 .version = {1, 0, 0},
1106
1107 .make_rq = pblk_make_rq,
1108 .capacity = pblk_capacity,
1109
1110 .init = pblk_init,
1111 .exit = pblk_exit,
1112
1113 .sysfs_init = pblk_sysfs_init,
1114 .sysfs_exit = pblk_sysfs_exit,
1115 .owner = THIS_MODULE,
1116 };
1117
1118 static int __init pblk_module_init(void)
1119 {
1120 int ret;
1121
1122 pblk_bio_set = bioset_create(BIO_POOL_SIZE, 0, 0);
1123 if (!pblk_bio_set)
1124 return -ENOMEM;
1125 ret = nvm_register_tgt_type(&tt_pblk);
1126 if (ret)
1127 bioset_free(pblk_bio_set);
1128 return ret;
1129 }
1130
1131 static void pblk_module_exit(void)
1132 {
1133 bioset_free(pblk_bio_set);
1134 nvm_unregister_tgt_type(&tt_pblk);
1135 }
1136
1137 module_init(pblk_module_init);
1138 module_exit(pblk_module_exit);
1139 MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
1140 MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
1141 MODULE_LICENSE("GPL v2");
1142 MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");
CRIS linux kernel tree