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f81232: switch to ->get_serial()
[linux/fpc-iii.git] / drivers / lightnvm / pblk-core.c
blob00984b486fea72a953652385c6133468f6f96810
1 /*
2 * Copyright (C) 2016 CNEX Labs
3 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
4 * Matias Bjorling <matias@cnexlabs.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * pblk-core.c - pblk's core functionality
16 *
17 */
18
19 #include "pblk.h"
20
21 static void pblk_line_mark_bb(struct work_struct *work)
22 {
23 struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
24 ws);
25 struct pblk *pblk = line_ws->pblk;
26 struct nvm_tgt_dev *dev = pblk->dev;
27 struct ppa_addr *ppa = line_ws->priv;
28 int ret;
29
30 ret = nvm_set_tgt_bb_tbl(dev, ppa, 1, NVM_BLK_T_GRWN_BAD);
31 if (ret) {
32 struct pblk_line *line;
33 int pos;
34
35 line = &pblk->lines[pblk_ppa_to_line(*ppa)];
36 pos = pblk_ppa_to_pos(&dev->geo, *ppa);
37
38 pblk_err(pblk, "failed to mark bb, line:%d, pos:%d\n",
39 line->id, pos);
40 }
41
42 kfree(ppa);
43 mempool_free(line_ws, &pblk->gen_ws_pool);
44 }
45
46 static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
47 struct ppa_addr ppa_addr)
48 {
49 struct nvm_tgt_dev *dev = pblk->dev;
50 struct nvm_geo *geo = &dev->geo;
51 struct ppa_addr *ppa;
52 int pos = pblk_ppa_to_pos(geo, ppa_addr);
53
54 pblk_debug(pblk, "erase failed: line:%d, pos:%d\n", line->id, pos);
55 atomic_long_inc(&pblk->erase_failed);
56
57 atomic_dec(&line->blk_in_line);
58 if (test_and_set_bit(pos, line->blk_bitmap))
59 pblk_err(pblk, "attempted to erase bb: line:%d, pos:%d\n",
60 line->id, pos);
61
62 /* Not necessary to mark bad blocks on 2.0 spec. */
63 if (geo->version == NVM_OCSSD_SPEC_20)
64 return;
65
66 ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
67 if (!ppa)
68 return;
69
70 *ppa = ppa_addr;
71 pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb,
72 GFP_ATOMIC, pblk->bb_wq);
73 }
74
75 static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
76 {
77 struct nvm_tgt_dev *dev = pblk->dev;
78 struct nvm_geo *geo = &dev->geo;
79 struct nvm_chk_meta *chunk;
80 struct pblk_line *line;
81 int pos;
82
83 line = &pblk->lines[pblk_ppa_to_line(rqd->ppa_addr)];
84 pos = pblk_ppa_to_pos(geo, rqd->ppa_addr);
85 chunk = &line->chks[pos];
86
87 atomic_dec(&line->left_seblks);
88
89 if (rqd->error) {
90 chunk->state = NVM_CHK_ST_OFFLINE;
91 pblk_mark_bb(pblk, line, rqd->ppa_addr);
92 } else {
93 chunk->state = NVM_CHK_ST_FREE;
94 }
95
96 atomic_dec(&pblk->inflight_io);
97 }
98
99 /* Erase completion assumes that only one block is erased at the time */
100 static void pblk_end_io_erase(struct nvm_rq *rqd)
101 {
102 struct pblk *pblk = rqd->private;
103
104 __pblk_end_io_erase(pblk, rqd);
105 mempool_free(rqd, &pblk->e_rq_pool);
106 }
107
108 /*
109 * Get information for all chunks from the device.
110 *
111 * The caller is responsible for freeing the returned structure
112 */
113 struct nvm_chk_meta *pblk_chunk_get_info(struct pblk *pblk)
114 {
115 struct nvm_tgt_dev *dev = pblk->dev;
116 struct nvm_geo *geo = &dev->geo;
117 struct nvm_chk_meta *meta;
118 struct ppa_addr ppa;
119 unsigned long len;
120 int ret;
121
122 ppa.ppa = 0;
123
124 len = geo->all_chunks * sizeof(*meta);
125 meta = kzalloc(len, GFP_KERNEL);
126 if (!meta)
127 return ERR_PTR(-ENOMEM);
128
129 ret = nvm_get_chunk_meta(dev, meta, ppa, geo->all_chunks);
130 if (ret) {
131 kfree(meta);
132 return ERR_PTR(-EIO);
133 }
134
135 return meta;
136 }
137
138 struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
139 struct nvm_chk_meta *meta,
140 struct ppa_addr ppa)
141 {
142 struct nvm_tgt_dev *dev = pblk->dev;
143 struct nvm_geo *geo = &dev->geo;
144 int ch_off = ppa.m.grp * geo->num_chk * geo->num_lun;
145 int lun_off = ppa.m.pu * geo->num_chk;
146 int chk_off = ppa.m.chk;
147
148 return meta + ch_off + lun_off + chk_off;
149 }
150
151 void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
152 u64 paddr)
153 {
154 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
155 struct list_head *move_list = NULL;
156
157 /* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P
158 * table is modified with reclaimed sectors, a check is done to endure
159 * that newer updates are not overwritten.
160 */
161 spin_lock(&line->lock);
162 WARN_ON(line->state == PBLK_LINESTATE_FREE);
163
164 if (test_and_set_bit(paddr, line->invalid_bitmap)) {
165 WARN_ONCE(1, "pblk: double invalidate\n");
166 spin_unlock(&line->lock);
167 return;
168 }
169 le32_add_cpu(line->vsc, -1);
170
171 if (line->state == PBLK_LINESTATE_CLOSED)
172 move_list = pblk_line_gc_list(pblk, line);
173 spin_unlock(&line->lock);
174
175 if (move_list) {
176 spin_lock(&l_mg->gc_lock);
177 spin_lock(&line->lock);
178 /* Prevent moving a line that has just been chosen for GC */
179 if (line->state == PBLK_LINESTATE_GC) {
180 spin_unlock(&line->lock);
181 spin_unlock(&l_mg->gc_lock);
182 return;
183 }
184 spin_unlock(&line->lock);
185
186 list_move_tail(&line->list, move_list);
187 spin_unlock(&l_mg->gc_lock);
188 }
189 }
190
191 void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
192 {
193 struct pblk_line *line;
194 u64 paddr;
195 int line_id;
196
197 #ifdef CONFIG_NVM_PBLK_DEBUG
198 /* Callers must ensure that the ppa points to a device address */
199 BUG_ON(pblk_addr_in_cache(ppa));
200 BUG_ON(pblk_ppa_empty(ppa));
201 #endif
202
203 line_id = pblk_ppa_to_line(ppa);
204 line = &pblk->lines[line_id];
205 paddr = pblk_dev_ppa_to_line_addr(pblk, ppa);
206
207 __pblk_map_invalidate(pblk, line, paddr);
208 }
209
210 static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
211 unsigned int nr_secs)
212 {
213 sector_t lba;
214
215 spin_lock(&pblk->trans_lock);
216 for (lba = slba; lba < slba + nr_secs; lba++) {
217 struct ppa_addr ppa;
218
219 ppa = pblk_trans_map_get(pblk, lba);
220
221 if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa))
222 pblk_map_invalidate(pblk, ppa);
223
224 pblk_ppa_set_empty(&ppa);
225 pblk_trans_map_set(pblk, lba, ppa);
226 }
227 spin_unlock(&pblk->trans_lock);
228 }
229
230 /* Caller must guarantee that the request is a valid type */
231 struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type)
232 {
233 mempool_t *pool;
234 struct nvm_rq *rqd;
235 int rq_size;
236
237 switch (type) {
238 case PBLK_WRITE:
239 case PBLK_WRITE_INT:
240 pool = &pblk->w_rq_pool;
241 rq_size = pblk_w_rq_size;
242 break;
243 case PBLK_READ:
244 pool = &pblk->r_rq_pool;
245 rq_size = pblk_g_rq_size;
246 break;
247 default:
248 pool = &pblk->e_rq_pool;
249 rq_size = pblk_g_rq_size;
250 }
251
252 rqd = mempool_alloc(pool, GFP_KERNEL);
253 memset(rqd, 0, rq_size);
254
255 return rqd;
256 }
257
258 /* Typically used on completion path. Cannot guarantee request consistency */
259 void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
260 {
261 struct nvm_tgt_dev *dev = pblk->dev;
262 mempool_t *pool;
263
264 switch (type) {
265 case PBLK_WRITE:
266 kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap);
267 /* fall through */
268 case PBLK_WRITE_INT:
269 pool = &pblk->w_rq_pool;
270 break;
271 case PBLK_READ:
272 pool = &pblk->r_rq_pool;
273 break;
274 case PBLK_ERASE:
275 pool = &pblk->e_rq_pool;
276 break;
277 default:
278 pblk_err(pblk, "trying to free unknown rqd type\n");
279 return;
280 }
281
282 if (rqd->meta_list)
283 nvm_dev_dma_free(dev->parent, rqd->meta_list,
284 rqd->dma_meta_list);
285 mempool_free(rqd, pool);
286 }
287
288 void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
289 int nr_pages)
290 {
291 struct bio_vec bv;
292 int i;
293
294 WARN_ON(off + nr_pages != bio->bi_vcnt);
295
296 for (i = off; i < nr_pages + off; i++) {
297 bv = bio->bi_io_vec[i];
298 mempool_free(bv.bv_page, &pblk->page_bio_pool);
299 }
300 }
301
302 int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
303 int nr_pages)
304 {
305 struct request_queue *q = pblk->dev->q;
306 struct page *page;
307 int i, ret;
308
309 for (i = 0; i < nr_pages; i++) {
310 page = mempool_alloc(&pblk->page_bio_pool, flags);
311
312 ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
313 if (ret != PBLK_EXPOSED_PAGE_SIZE) {
314 pblk_err(pblk, "could not add page to bio\n");
315 mempool_free(page, &pblk->page_bio_pool);
316 goto err;
317 }
318 }
319
320 return 0;
321 err:
322 pblk_bio_free_pages(pblk, bio, (bio->bi_vcnt - i), i);
323 return -1;
324 }
325
326 void pblk_write_kick(struct pblk *pblk)
327 {
328 wake_up_process(pblk->writer_ts);
329 mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000));
330 }
331
332 void pblk_write_timer_fn(struct timer_list *t)
333 {
334 struct pblk *pblk = from_timer(pblk, t, wtimer);
335
336 /* kick the write thread every tick to flush outstanding data */
337 pblk_write_kick(pblk);
338 }
339
340 void pblk_write_should_kick(struct pblk *pblk)
341 {
342 unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb);
343
344 if (secs_avail >= pblk->min_write_pgs)
345 pblk_write_kick(pblk);
346 }
347
348 static void pblk_wait_for_meta(struct pblk *pblk)
349 {
350 do {
351 if (!atomic_read(&pblk->inflight_io))
352 break;
353
354 schedule();
355 } while (1);
356 }
357
358 static void pblk_flush_writer(struct pblk *pblk)
359 {
360 pblk_rb_flush(&pblk->rwb);
361 do {
362 if (!pblk_rb_sync_count(&pblk->rwb))
363 break;
364
365 pblk_write_kick(pblk);
366 schedule();
367 } while (1);
368 }
369
370 struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
371 {
372 struct pblk_line_meta *lm = &pblk->lm;
373 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
374 struct list_head *move_list = NULL;
375 int vsc = le32_to_cpu(*line->vsc);
376
377 lockdep_assert_held(&line->lock);
378
379 if (line->w_err_gc->has_write_err) {
380 if (line->gc_group != PBLK_LINEGC_WERR) {
381 line->gc_group = PBLK_LINEGC_WERR;
382 move_list = &l_mg->gc_werr_list;
383 pblk_rl_werr_line_in(&pblk->rl);
384 }
385 } else if (!vsc) {
386 if (line->gc_group != PBLK_LINEGC_FULL) {
387 line->gc_group = PBLK_LINEGC_FULL;
388 move_list = &l_mg->gc_full_list;
389 }
390 } else if (vsc < lm->high_thrs) {
391 if (line->gc_group != PBLK_LINEGC_HIGH) {
392 line->gc_group = PBLK_LINEGC_HIGH;
393 move_list = &l_mg->gc_high_list;
394 }
395 } else if (vsc < lm->mid_thrs) {
396 if (line->gc_group != PBLK_LINEGC_MID) {
397 line->gc_group = PBLK_LINEGC_MID;
398 move_list = &l_mg->gc_mid_list;
399 }
400 } else if (vsc < line->sec_in_line) {
401 if (line->gc_group != PBLK_LINEGC_LOW) {
402 line->gc_group = PBLK_LINEGC_LOW;
403 move_list = &l_mg->gc_low_list;
404 }
405 } else if (vsc == line->sec_in_line) {
406 if (line->gc_group != PBLK_LINEGC_EMPTY) {
407 line->gc_group = PBLK_LINEGC_EMPTY;
408 move_list = &l_mg->gc_empty_list;
409 }
410 } else {
411 line->state = PBLK_LINESTATE_CORRUPT;
412 line->gc_group = PBLK_LINEGC_NONE;
413 move_list = &l_mg->corrupt_list;
414 pblk_err(pblk, "corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n",
415 line->id, vsc,
416 line->sec_in_line,
417 lm->high_thrs, lm->mid_thrs);
418 }
419
420 return move_list;
421 }
422
423 void pblk_discard(struct pblk *pblk, struct bio *bio)
424 {
425 sector_t slba = pblk_get_lba(bio);
426 sector_t nr_secs = pblk_get_secs(bio);
427
428 pblk_invalidate_range(pblk, slba, nr_secs);
429 }
430
431 void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd)
432 {
433 atomic_long_inc(&pblk->write_failed);
434 #ifdef CONFIG_NVM_PBLK_DEBUG
435 pblk_print_failed_rqd(pblk, rqd, rqd->error);
436 #endif
437 }
438
439 void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
440 {
441 /* Empty page read is not necessarily an error (e.g., L2P recovery) */
442 if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
443 atomic_long_inc(&pblk->read_empty);
444 return;
445 }
446
447 switch (rqd->error) {
448 case NVM_RSP_WARN_HIGHECC:
449 atomic_long_inc(&pblk->read_high_ecc);
450 break;
451 case NVM_RSP_ERR_FAILECC:
452 case NVM_RSP_ERR_FAILCRC:
453 atomic_long_inc(&pblk->read_failed);
454 break;
455 default:
456 pblk_err(pblk, "unknown read error:%d\n", rqd->error);
457 }
458 #ifdef CONFIG_NVM_PBLK_DEBUG
459 pblk_print_failed_rqd(pblk, rqd, rqd->error);
460 #endif
461 }
462
463 void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
464 {
465 pblk->sec_per_write = sec_per_write;
466 }
467
468 int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
469 {
470 struct nvm_tgt_dev *dev = pblk->dev;
471
472 atomic_inc(&pblk->inflight_io);
473
474 #ifdef CONFIG_NVM_PBLK_DEBUG
475 if (pblk_check_io(pblk, rqd))
476 return NVM_IO_ERR;
477 #endif
478
479 return nvm_submit_io(dev, rqd);
480 }
481
482 int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
483 {
484 struct nvm_tgt_dev *dev = pblk->dev;
485
486 atomic_inc(&pblk->inflight_io);
487
488 #ifdef CONFIG_NVM_PBLK_DEBUG
489 if (pblk_check_io(pblk, rqd))
490 return NVM_IO_ERR;
491 #endif
492
493 return nvm_submit_io_sync(dev, rqd);
494 }
495
496 static void pblk_bio_map_addr_endio(struct bio *bio)
497 {
498 bio_put(bio);
499 }
500
501 struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
502 unsigned int nr_secs, unsigned int len,
503 int alloc_type, gfp_t gfp_mask)
504 {
505 struct nvm_tgt_dev *dev = pblk->dev;
506 void *kaddr = data;
507 struct page *page;
508 struct bio *bio;
509 int i, ret;
510
511 if (alloc_type == PBLK_KMALLOC_META)
512 return bio_map_kern(dev->q, kaddr, len, gfp_mask);
513
514 bio = bio_kmalloc(gfp_mask, nr_secs);
515 if (!bio)
516 return ERR_PTR(-ENOMEM);
517
518 for (i = 0; i < nr_secs; i++) {
519 page = vmalloc_to_page(kaddr);
520 if (!page) {
521 pblk_err(pblk, "could not map vmalloc bio\n");
522 bio_put(bio);
523 bio = ERR_PTR(-ENOMEM);
524 goto out;
525 }
526
527 ret = bio_add_pc_page(dev->q, bio, page, PAGE_SIZE, 0);
528 if (ret != PAGE_SIZE) {
529 pblk_err(pblk, "could not add page to bio\n");
530 bio_put(bio);
531 bio = ERR_PTR(-ENOMEM);
532 goto out;
533 }
534
535 kaddr += PAGE_SIZE;
536 }
537
538 bio->bi_end_io = pblk_bio_map_addr_endio;
539 out:
540 return bio;
541 }
542
543 int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
544 unsigned long secs_to_flush)
545 {
546 int max = pblk->sec_per_write;
547 int min = pblk->min_write_pgs;
548 int secs_to_sync = 0;
549
550 if (secs_avail >= max)
551 secs_to_sync = max;
552 else if (secs_avail >= min)
553 secs_to_sync = min * (secs_avail / min);
554 else if (secs_to_flush)
555 secs_to_sync = min;
556
557 return secs_to_sync;
558 }
559
560 void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
561 {
562 u64 addr;
563 int i;
564
565 spin_lock(&line->lock);
566 addr = find_next_zero_bit(line->map_bitmap,
567 pblk->lm.sec_per_line, line->cur_sec);
568 line->cur_sec = addr - nr_secs;
569
570 for (i = 0; i < nr_secs; i++, line->cur_sec--)
571 WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
572 spin_unlock(&line->lock);
573 }
574
575 u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
576 {
577 u64 addr;
578 int i;
579
580 lockdep_assert_held(&line->lock);
581
582 /* logic error: ppa out-of-bounds. Prevent generating bad address */
583 if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) {
584 WARN(1, "pblk: page allocation out of bounds\n");
585 nr_secs = pblk->lm.sec_per_line - line->cur_sec;
586 }
587
588 line->cur_sec = addr = find_next_zero_bit(line->map_bitmap,
589 pblk->lm.sec_per_line, line->cur_sec);
590 for (i = 0; i < nr_secs; i++, line->cur_sec++)
591 WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap));
592
593 return addr;
594 }
595
596 u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
597 {
598 u64 addr;
599
600 /* Lock needed in case a write fails and a recovery needs to remap
601 * failed write buffer entries
602 */
603 spin_lock(&line->lock);
604 addr = __pblk_alloc_page(pblk, line, nr_secs);
605 line->left_msecs -= nr_secs;
606 WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n");
607 spin_unlock(&line->lock);
608
609 return addr;
610 }
611
612 u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line)
613 {
614 u64 paddr;
615
616 spin_lock(&line->lock);
617 paddr = find_next_zero_bit(line->map_bitmap,
618 pblk->lm.sec_per_line, line->cur_sec);
619 spin_unlock(&line->lock);
620
621 return paddr;
622 }
623
624 /*
625 * Submit emeta to one LUN in the raid line at the time to avoid a deadlock when
626 * taking the per LUN semaphore.
627 */
628 static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
629 void *emeta_buf, u64 paddr, int dir)
630 {
631 struct nvm_tgt_dev *dev = pblk->dev;
632 struct nvm_geo *geo = &dev->geo;
633 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
634 struct pblk_line_meta *lm = &pblk->lm;
635 void *ppa_list, *meta_list;
636 struct bio *bio;
637 struct nvm_rq rqd;
638 dma_addr_t dma_ppa_list, dma_meta_list;
639 int min = pblk->min_write_pgs;
640 int left_ppas = lm->emeta_sec[0];
641 int id = line->id;
642 int rq_ppas, rq_len;
643 int cmd_op, bio_op;
644 int i, j;
645 int ret;
646
647 if (dir == PBLK_WRITE) {
648 bio_op = REQ_OP_WRITE;
649 cmd_op = NVM_OP_PWRITE;
650 } else if (dir == PBLK_READ) {
651 bio_op = REQ_OP_READ;
652 cmd_op = NVM_OP_PREAD;
653 } else
654 return -EINVAL;
655
656 meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
657 &dma_meta_list);
658 if (!meta_list)
659 return -ENOMEM;
660
661 ppa_list = meta_list + pblk_dma_meta_size;
662 dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
663
664 next_rq:
665 memset(&rqd, 0, sizeof(struct nvm_rq));
666
667 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
668 rq_len = rq_ppas * geo->csecs;
669
670 bio = pblk_bio_map_addr(pblk, emeta_buf, rq_ppas, rq_len,
671 l_mg->emeta_alloc_type, GFP_KERNEL);
672 if (IS_ERR(bio)) {
673 ret = PTR_ERR(bio);
674 goto free_rqd_dma;
675 }
676
677 bio->bi_iter.bi_sector = 0; /* internal bio */
678 bio_set_op_attrs(bio, bio_op, 0);
679
680 rqd.bio = bio;
681 rqd.meta_list = meta_list;
682 rqd.ppa_list = ppa_list;
683 rqd.dma_meta_list = dma_meta_list;
684 rqd.dma_ppa_list = dma_ppa_list;
685 rqd.opcode = cmd_op;
686 rqd.nr_ppas = rq_ppas;
687
688 if (dir == PBLK_WRITE) {
689 struct pblk_sec_meta *meta_list = rqd.meta_list;
690
691 rqd.flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
692 for (i = 0; i < rqd.nr_ppas; ) {
693 spin_lock(&line->lock);
694 paddr = __pblk_alloc_page(pblk, line, min);
695 spin_unlock(&line->lock);
696 for (j = 0; j < min; j++, i++, paddr++) {
697 meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
698 rqd.ppa_list[i] =
699 addr_to_gen_ppa(pblk, paddr, id);
700 }
701 }
702 } else {
703 for (i = 0; i < rqd.nr_ppas; ) {
704 struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, id);
705 int pos = pblk_ppa_to_pos(geo, ppa);
706 int read_type = PBLK_READ_RANDOM;
707
708 if (pblk_io_aligned(pblk, rq_ppas))
709 read_type = PBLK_READ_SEQUENTIAL;
710 rqd.flags = pblk_set_read_mode(pblk, read_type);
711
712 while (test_bit(pos, line->blk_bitmap)) {
713 paddr += min;
714 if (pblk_boundary_paddr_checks(pblk, paddr)) {
715 pblk_err(pblk, "corrupt emeta line:%d\n",
716 line->id);
717 bio_put(bio);
718 ret = -EINTR;
719 goto free_rqd_dma;
720 }
721
722 ppa = addr_to_gen_ppa(pblk, paddr, id);
723 pos = pblk_ppa_to_pos(geo, ppa);
724 }
725
726 if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
727 pblk_err(pblk, "corrupt emeta line:%d\n",
728 line->id);
729 bio_put(bio);
730 ret = -EINTR;
731 goto free_rqd_dma;
732 }
733
734 for (j = 0; j < min; j++, i++, paddr++)
735 rqd.ppa_list[i] =
736 addr_to_gen_ppa(pblk, paddr, line->id);
737 }
738 }
739
740 ret = pblk_submit_io_sync(pblk, &rqd);
741 if (ret) {
742 pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
743 bio_put(bio);
744 goto free_rqd_dma;
745 }
746
747 atomic_dec(&pblk->inflight_io);
748
749 if (rqd.error) {
750 if (dir == PBLK_WRITE)
751 pblk_log_write_err(pblk, &rqd);
752 else
753 pblk_log_read_err(pblk, &rqd);
754 }
755
756 emeta_buf += rq_len;
757 left_ppas -= rq_ppas;
758 if (left_ppas)
759 goto next_rq;
760 free_rqd_dma:
761 nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
762 return ret;
763 }
764
765 u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line)
766 {
767 struct nvm_tgt_dev *dev = pblk->dev;
768 struct nvm_geo *geo = &dev->geo;
769 struct pblk_line_meta *lm = &pblk->lm;
770 int bit;
771
772 /* This usually only happens on bad lines */
773 bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
774 if (bit >= lm->blk_per_line)
775 return -1;
776
777 return bit * geo->ws_opt;
778 }
779
780 static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line,
781 u64 paddr, int dir)
782 {
783 struct nvm_tgt_dev *dev = pblk->dev;
784 struct pblk_line_meta *lm = &pblk->lm;
785 struct bio *bio;
786 struct nvm_rq rqd;
787 __le64 *lba_list = NULL;
788 int i, ret;
789 int cmd_op, bio_op;
790 int flags;
791
792 if (dir == PBLK_WRITE) {
793 bio_op = REQ_OP_WRITE;
794 cmd_op = NVM_OP_PWRITE;
795 flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
796 lba_list = emeta_to_lbas(pblk, line->emeta->buf);
797 } else if (dir == PBLK_READ_RECOV || dir == PBLK_READ) {
798 bio_op = REQ_OP_READ;
799 cmd_op = NVM_OP_PREAD;
800 flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
801 } else
802 return -EINVAL;
803
804 memset(&rqd, 0, sizeof(struct nvm_rq));
805
806 rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
807 &rqd.dma_meta_list);
808 if (!rqd.meta_list)
809 return -ENOMEM;
810
811 rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
812 rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;
813
814 bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
815 if (IS_ERR(bio)) {
816 ret = PTR_ERR(bio);
817 goto free_ppa_list;
818 }
819
820 bio->bi_iter.bi_sector = 0; /* internal bio */
821 bio_set_op_attrs(bio, bio_op, 0);
822
823 rqd.bio = bio;
824 rqd.opcode = cmd_op;
825 rqd.flags = flags;
826 rqd.nr_ppas = lm->smeta_sec;
827
828 for (i = 0; i < lm->smeta_sec; i++, paddr++) {
829 struct pblk_sec_meta *meta_list = rqd.meta_list;
830
831 rqd.ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
832
833 if (dir == PBLK_WRITE) {
834 __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
835
836 meta_list[i].lba = lba_list[paddr] = addr_empty;
837 }
838 }
839
840 /*
841 * This I/O is sent by the write thread when a line is replace. Since
842 * the write thread is the only one sending write and erase commands,
843 * there is no need to take the LUN semaphore.
844 */
845 ret = pblk_submit_io_sync(pblk, &rqd);
846 if (ret) {
847 pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
848 bio_put(bio);
849 goto free_ppa_list;
850 }
851
852 atomic_dec(&pblk->inflight_io);
853
854 if (rqd.error) {
855 if (dir == PBLK_WRITE) {
856 pblk_log_write_err(pblk, &rqd);
857 ret = 1;
858 } else if (dir == PBLK_READ)
859 pblk_log_read_err(pblk, &rqd);
860 }
861
862 free_ppa_list:
863 nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
864
865 return ret;
866 }
867
868 int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line)
869 {
870 u64 bpaddr = pblk_line_smeta_start(pblk, line);
871
872 return pblk_line_submit_smeta_io(pblk, line, bpaddr, PBLK_READ_RECOV);
873 }
874
875 int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line,
876 void *emeta_buf)
877 {
878 return pblk_line_submit_emeta_io(pblk, line, emeta_buf,
879 line->emeta_ssec, PBLK_READ);
880 }
881
882 static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd,
883 struct ppa_addr ppa)
884 {
885 rqd->opcode = NVM_OP_ERASE;
886 rqd->ppa_addr = ppa;
887 rqd->nr_ppas = 1;
888 rqd->flags = pblk_set_progr_mode(pblk, PBLK_ERASE);
889 rqd->bio = NULL;
890 }
891
892 static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
893 {
894 struct nvm_rq rqd;
895 int ret = 0;
896
897 memset(&rqd, 0, sizeof(struct nvm_rq));
898
899 pblk_setup_e_rq(pblk, &rqd, ppa);
900
901 /* The write thread schedules erases so that it minimizes disturbances
902 * with writes. Thus, there is no need to take the LUN semaphore.
903 */
904 ret = pblk_submit_io_sync(pblk, &rqd);
905 if (ret) {
906 struct nvm_tgt_dev *dev = pblk->dev;
907 struct nvm_geo *geo = &dev->geo;
908
909 pblk_err(pblk, "could not sync erase line:%d,blk:%d\n",
910 pblk_ppa_to_line(ppa),
911 pblk_ppa_to_pos(geo, ppa));
912
913 rqd.error = ret;
914 goto out;
915 }
916
917 out:
918 rqd.private = pblk;
919 __pblk_end_io_erase(pblk, &rqd);
920
921 return ret;
922 }
923
924 int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
925 {
926 struct pblk_line_meta *lm = &pblk->lm;
927 struct ppa_addr ppa;
928 int ret, bit = -1;
929
930 /* Erase only good blocks, one at a time */
931 do {
932 spin_lock(&line->lock);
933 bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line,
934 bit + 1);
935 if (bit >= lm->blk_per_line) {
936 spin_unlock(&line->lock);
937 break;
938 }
939
940 ppa = pblk->luns[bit].bppa; /* set ch and lun */
941 ppa.a.blk = line->id;
942
943 atomic_dec(&line->left_eblks);
944 WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
945 spin_unlock(&line->lock);
946
947 ret = pblk_blk_erase_sync(pblk, ppa);
948 if (ret) {
949 pblk_err(pblk, "failed to erase line %d\n", line->id);
950 return ret;
951 }
952 } while (1);
953
954 return 0;
955 }
956
957 static void pblk_line_setup_metadata(struct pblk_line *line,
958 struct pblk_line_mgmt *l_mg,
959 struct pblk_line_meta *lm)
960 {
961 int meta_line;
962
963 lockdep_assert_held(&l_mg->free_lock);
964
965 retry_meta:
966 meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
967 if (meta_line == PBLK_DATA_LINES) {
968 spin_unlock(&l_mg->free_lock);
969 io_schedule();
970 spin_lock(&l_mg->free_lock);
971 goto retry_meta;
972 }
973
974 set_bit(meta_line, &l_mg->meta_bitmap);
975 line->meta_line = meta_line;
976
977 line->smeta = l_mg->sline_meta[meta_line];
978 line->emeta = l_mg->eline_meta[meta_line];
979
980 memset(line->smeta, 0, lm->smeta_len);
981 memset(line->emeta->buf, 0, lm->emeta_len[0]);
982
983 line->emeta->mem = 0;
984 atomic_set(&line->emeta->sync, 0);
985 }
986
987 /* For now lines are always assumed full lines. Thus, smeta former and current
988 * lun bitmaps are omitted.
989 */
990 static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
991 struct pblk_line *cur)
992 {
993 struct nvm_tgt_dev *dev = pblk->dev;
994 struct nvm_geo *geo = &dev->geo;
995 struct pblk_line_meta *lm = &pblk->lm;
996 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
997 struct pblk_emeta *emeta = line->emeta;
998 struct line_emeta *emeta_buf = emeta->buf;
999 struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
1000 int nr_blk_line;
1001
1002 /* After erasing the line, new bad blocks might appear and we risk
1003 * having an invalid line
1004 */
1005 nr_blk_line = lm->blk_per_line -
1006 bitmap_weight(line->blk_bitmap, lm->blk_per_line);
1007 if (nr_blk_line < lm->min_blk_line) {
1008 spin_lock(&l_mg->free_lock);
1009 spin_lock(&line->lock);
1010 line->state = PBLK_LINESTATE_BAD;
1011 spin_unlock(&line->lock);
1012
1013 list_add_tail(&line->list, &l_mg->bad_list);
1014 spin_unlock(&l_mg->free_lock);
1015
1016 pblk_debug(pblk, "line %d is bad\n", line->id);
1017
1018 return 0;
1019 }
1020
1021 /* Run-time metadata */
1022 line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
1023
1024 /* Mark LUNs allocated in this line (all for now) */
1025 bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len);
1026
1027 smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
1028 memcpy(smeta_buf->header.uuid, pblk->instance_uuid, 16);
1029 smeta_buf->header.id = cpu_to_le32(line->id);
1030 smeta_buf->header.type = cpu_to_le16(line->type);
1031 smeta_buf->header.version_major = SMETA_VERSION_MAJOR;
1032 smeta_buf->header.version_minor = SMETA_VERSION_MINOR;
1033
1034 /* Start metadata */
1035 smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
1036 smeta_buf->window_wr_lun = cpu_to_le32(geo->all_luns);
1037
1038 /* Fill metadata among lines */
1039 if (cur) {
1040 memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
1041 smeta_buf->prev_id = cpu_to_le32(cur->id);
1042 cur->emeta->buf->next_id = cpu_to_le32(line->id);
1043 } else {
1044 smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
1045 }
1046
1047 /* All smeta must be set at this point */
1048 smeta_buf->header.crc = cpu_to_le32(
1049 pblk_calc_meta_header_crc(pblk, &smeta_buf->header));
1050 smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf));
1051
1052 /* End metadata */
1053 memcpy(&emeta_buf->header, &smeta_buf->header,
1054 sizeof(struct line_header));
1055
1056 emeta_buf->header.version_major = EMETA_VERSION_MAJOR;
1057 emeta_buf->header.version_minor = EMETA_VERSION_MINOR;
1058 emeta_buf->header.crc = cpu_to_le32(
1059 pblk_calc_meta_header_crc(pblk, &emeta_buf->header));
1060
1061 emeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
1062 emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line);
1063 emeta_buf->nr_valid_lbas = cpu_to_le64(0);
1064 emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY);
1065 emeta_buf->crc = cpu_to_le32(0);
1066 emeta_buf->prev_id = smeta_buf->prev_id;
1067
1068 return 1;
1069 }
1070
1071 static int pblk_line_alloc_bitmaps(struct pblk *pblk, struct pblk_line *line)
1072 {
1073 struct pblk_line_meta *lm = &pblk->lm;
1074
1075 line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
1076 if (!line->map_bitmap)
1077 return -ENOMEM;
1078
1079 /* will be initialized using bb info from map_bitmap */
1080 line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_KERNEL);
1081 if (!line->invalid_bitmap) {
1082 kfree(line->map_bitmap);
1083 line->map_bitmap = NULL;
1084 return -ENOMEM;
1085 }
1086
1087 return 0;
1088 }
1089
1090 /* For now lines are always assumed full lines. Thus, smeta former and current
1091 * lun bitmaps are omitted.
1092 */
1093 static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
1094 int init)
1095 {
1096 struct nvm_tgt_dev *dev = pblk->dev;
1097 struct nvm_geo *geo = &dev->geo;
1098 struct pblk_line_meta *lm = &pblk->lm;
1099 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1100 u64 off;
1101 int bit = -1;
1102 int emeta_secs;
1103
1104 line->sec_in_line = lm->sec_per_line;
1105
1106 /* Capture bad block information on line mapping bitmaps */
1107 while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line,
1108 bit + 1)) < lm->blk_per_line) {
1109 off = bit * geo->ws_opt;
1110 bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off,
1111 lm->sec_per_line);
1112 bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux,
1113 lm->sec_per_line);
1114 line->sec_in_line -= geo->clba;
1115 }
1116
1117 /* Mark smeta metadata sectors as bad sectors */
1118 bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
1119 off = bit * geo->ws_opt;
1120 bitmap_set(line->map_bitmap, off, lm->smeta_sec);
1121 line->sec_in_line -= lm->smeta_sec;
1122 line->smeta_ssec = off;
1123 line->cur_sec = off + lm->smeta_sec;
1124
1125 if (init && pblk_line_submit_smeta_io(pblk, line, off, PBLK_WRITE)) {
1126 pblk_debug(pblk, "line smeta I/O failed. Retry\n");
1127 return 0;
1128 }
1129
1130 bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line);
1131
1132 /* Mark emeta metadata sectors as bad sectors. We need to consider bad
1133 * blocks to make sure that there are enough sectors to store emeta
1134 */
1135 emeta_secs = lm->emeta_sec[0];
1136 off = lm->sec_per_line;
1137 while (emeta_secs) {
1138 off -= geo->ws_opt;
1139 if (!test_bit(off, line->invalid_bitmap)) {
1140 bitmap_set(line->invalid_bitmap, off, geo->ws_opt);
1141 emeta_secs -= geo->ws_opt;
1142 }
1143 }
1144
1145 line->emeta_ssec = off;
1146 line->sec_in_line -= lm->emeta_sec[0];
1147 line->nr_valid_lbas = 0;
1148 line->left_msecs = line->sec_in_line;
1149 *line->vsc = cpu_to_le32(line->sec_in_line);
1150
1151 if (lm->sec_per_line - line->sec_in_line !=
1152 bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) {
1153 spin_lock(&line->lock);
1154 line->state = PBLK_LINESTATE_BAD;
1155 spin_unlock(&line->lock);
1156
1157 list_add_tail(&line->list, &l_mg->bad_list);
1158 pblk_err(pblk, "unexpected line %d is bad\n", line->id);
1159
1160 return 0;
1161 }
1162
1163 return 1;
1164 }
1165
1166 static int pblk_prepare_new_line(struct pblk *pblk, struct pblk_line *line)
1167 {
1168 struct pblk_line_meta *lm = &pblk->lm;
1169 struct nvm_tgt_dev *dev = pblk->dev;
1170 struct nvm_geo *geo = &dev->geo;
1171 int blk_to_erase = atomic_read(&line->blk_in_line);
1172 int i;
1173
1174 for (i = 0; i < lm->blk_per_line; i++) {
1175 struct pblk_lun *rlun = &pblk->luns[i];
1176 int pos = pblk_ppa_to_pos(geo, rlun->bppa);
1177 int state = line->chks[pos].state;
1178
1179 /* Free chunks should not be erased */
1180 if (state & NVM_CHK_ST_FREE) {
1181 set_bit(pblk_ppa_to_pos(geo, rlun->bppa),
1182 line->erase_bitmap);
1183 blk_to_erase--;
1184 }
1185 }
1186
1187 return blk_to_erase;
1188 }
1189
1190 static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
1191 {
1192 struct pblk_line_meta *lm = &pblk->lm;
1193 int blk_in_line = atomic_read(&line->blk_in_line);
1194 int blk_to_erase;
1195
1196 /* Bad blocks do not need to be erased */
1197 bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
1198
1199 spin_lock(&line->lock);
1200
1201 /* If we have not written to this line, we need to mark up free chunks
1202 * as already erased
1203 */
1204 if (line->state == PBLK_LINESTATE_NEW) {
1205 blk_to_erase = pblk_prepare_new_line(pblk, line);
1206 line->state = PBLK_LINESTATE_FREE;
1207 } else {
1208 blk_to_erase = blk_in_line;
1209 }
1210
1211 if (blk_in_line < lm->min_blk_line) {
1212 spin_unlock(&line->lock);
1213 return -EAGAIN;
1214 }
1215
1216 if (line->state != PBLK_LINESTATE_FREE) {
1217 WARN(1, "pblk: corrupted line %d, state %d\n",
1218 line->id, line->state);
1219 spin_unlock(&line->lock);
1220 return -EINTR;
1221 }
1222
1223 line->state = PBLK_LINESTATE_OPEN;
1224
1225 atomic_set(&line->left_eblks, blk_to_erase);
1226 atomic_set(&line->left_seblks, blk_to_erase);
1227
1228 line->meta_distance = lm->meta_distance;
1229 spin_unlock(&line->lock);
1230
1231 kref_init(&line->ref);
1232
1233 return 0;
1234 }
1235
1236 int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
1237 {
1238 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1239 int ret;
1240
1241 spin_lock(&l_mg->free_lock);
1242 l_mg->data_line = line;
1243 list_del(&line->list);
1244
1245 ret = pblk_line_prepare(pblk, line);
1246 if (ret) {
1247 list_add(&line->list, &l_mg->free_list);
1248 spin_unlock(&l_mg->free_lock);
1249 return ret;
1250 }
1251 spin_unlock(&l_mg->free_lock);
1252
1253 ret = pblk_line_alloc_bitmaps(pblk, line);
1254 if (ret)
1255 return ret;
1256
1257 if (!pblk_line_init_bb(pblk, line, 0)) {
1258 list_add(&line->list, &l_mg->free_list);
1259 return -EINTR;
1260 }
1261
1262 pblk_rl_free_lines_dec(&pblk->rl, line, true);
1263 return 0;
1264 }
1265
1266 void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
1267 {
1268 kfree(line->map_bitmap);
1269 line->map_bitmap = NULL;
1270 line->smeta = NULL;
1271 line->emeta = NULL;
1272 }
1273
1274 static void pblk_line_reinit(struct pblk_line *line)
1275 {
1276 *line->vsc = cpu_to_le32(EMPTY_ENTRY);
1277
1278 line->map_bitmap = NULL;
1279 line->invalid_bitmap = NULL;
1280 line->smeta = NULL;
1281 line->emeta = NULL;
1282 }
1283
1284 void pblk_line_free(struct pblk_line *line)
1285 {
1286 kfree(line->map_bitmap);
1287 kfree(line->invalid_bitmap);
1288
1289 pblk_line_reinit(line);
1290 }
1291
1292 struct pblk_line *pblk_line_get(struct pblk *pblk)
1293 {
1294 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1295 struct pblk_line_meta *lm = &pblk->lm;
1296 struct pblk_line *line;
1297 int ret, bit;
1298
1299 lockdep_assert_held(&l_mg->free_lock);
1300
1301 retry:
1302 if (list_empty(&l_mg->free_list)) {
1303 pblk_err(pblk, "no free lines\n");
1304 return NULL;
1305 }
1306
1307 line = list_first_entry(&l_mg->free_list, struct pblk_line, list);
1308 list_del(&line->list);
1309 l_mg->nr_free_lines--;
1310
1311 bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
1312 if (unlikely(bit >= lm->blk_per_line)) {
1313 spin_lock(&line->lock);
1314 line->state = PBLK_LINESTATE_BAD;
1315 spin_unlock(&line->lock);
1316
1317 list_add_tail(&line->list, &l_mg->bad_list);
1318
1319 pblk_debug(pblk, "line %d is bad\n", line->id);
1320 goto retry;
1321 }
1322
1323 ret = pblk_line_prepare(pblk, line);
1324 if (ret) {
1325 switch (ret) {
1326 case -EAGAIN:
1327 list_add(&line->list, &l_mg->bad_list);
1328 goto retry;
1329 case -EINTR:
1330 list_add(&line->list, &l_mg->corrupt_list);
1331 goto retry;
1332 default:
1333 pblk_err(pblk, "failed to prepare line %d\n", line->id);
1334 list_add(&line->list, &l_mg->free_list);
1335 l_mg->nr_free_lines++;
1336 return NULL;
1337 }
1338 }
1339
1340 return line;
1341 }
1342
1343 static struct pblk_line *pblk_line_retry(struct pblk *pblk,
1344 struct pblk_line *line)
1345 {
1346 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1347 struct pblk_line *retry_line;
1348
1349 retry:
1350 spin_lock(&l_mg->free_lock);
1351 retry_line = pblk_line_get(pblk);
1352 if (!retry_line) {
1353 l_mg->data_line = NULL;
1354 spin_unlock(&l_mg->free_lock);
1355 return NULL;
1356 }
1357
1358 retry_line->map_bitmap = line->map_bitmap;
1359 retry_line->invalid_bitmap = line->invalid_bitmap;
1360 retry_line->smeta = line->smeta;
1361 retry_line->emeta = line->emeta;
1362 retry_line->meta_line = line->meta_line;
1363
1364 pblk_line_reinit(line);
1365
1366 l_mg->data_line = retry_line;
1367 spin_unlock(&l_mg->free_lock);
1368
1369 pblk_rl_free_lines_dec(&pblk->rl, line, false);
1370
1371 if (pblk_line_erase(pblk, retry_line))
1372 goto retry;
1373
1374 return retry_line;
1375 }
1376
1377 static void pblk_set_space_limit(struct pblk *pblk)
1378 {
1379 struct pblk_rl *rl = &pblk->rl;
1380
1381 atomic_set(&rl->rb_space, 0);
1382 }
1383
1384 struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
1385 {
1386 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1387 struct pblk_line *line;
1388
1389 spin_lock(&l_mg->free_lock);
1390 line = pblk_line_get(pblk);
1391 if (!line) {
1392 spin_unlock(&l_mg->free_lock);
1393 return NULL;
1394 }
1395
1396 line->seq_nr = l_mg->d_seq_nr++;
1397 line->type = PBLK_LINETYPE_DATA;
1398 l_mg->data_line = line;
1399
1400 pblk_line_setup_metadata(line, l_mg, &pblk->lm);
1401
1402 /* Allocate next line for preparation */
1403 l_mg->data_next = pblk_line_get(pblk);
1404 if (!l_mg->data_next) {
1405 /* If we cannot get a new line, we need to stop the pipeline.
1406 * Only allow as many writes in as we can store safely and then
1407 * fail gracefully
1408 */
1409 pblk_set_space_limit(pblk);
1410
1411 l_mg->data_next = NULL;
1412 } else {
1413 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
1414 l_mg->data_next->type = PBLK_LINETYPE_DATA;
1415 }
1416 spin_unlock(&l_mg->free_lock);
1417
1418 if (pblk_line_alloc_bitmaps(pblk, line))
1419 return NULL;
1420
1421 if (pblk_line_erase(pblk, line)) {
1422 line = pblk_line_retry(pblk, line);
1423 if (!line)
1424 return NULL;
1425 }
1426
1427 retry_setup:
1428 if (!pblk_line_init_metadata(pblk, line, NULL)) {
1429 line = pblk_line_retry(pblk, line);
1430 if (!line)
1431 return NULL;
1432
1433 goto retry_setup;
1434 }
1435
1436 if (!pblk_line_init_bb(pblk, line, 1)) {
1437 line = pblk_line_retry(pblk, line);
1438 if (!line)
1439 return NULL;
1440
1441 goto retry_setup;
1442 }
1443
1444 pblk_rl_free_lines_dec(&pblk->rl, line, true);
1445
1446 return line;
1447 }
1448
1449 static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line)
1450 {
1451 lockdep_assert_held(&pblk->l_mg.free_lock);
1452
1453 pblk_set_space_limit(pblk);
1454 pblk->state = PBLK_STATE_STOPPING;
1455 }
1456
1457 static void pblk_line_close_meta_sync(struct pblk *pblk)
1458 {
1459 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1460 struct pblk_line_meta *lm = &pblk->lm;
1461 struct pblk_line *line, *tline;
1462 LIST_HEAD(list);
1463
1464 spin_lock(&l_mg->close_lock);
1465 if (list_empty(&l_mg->emeta_list)) {
1466 spin_unlock(&l_mg->close_lock);
1467 return;
1468 }
1469
1470 list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev);
1471 spin_unlock(&l_mg->close_lock);
1472
1473 list_for_each_entry_safe(line, tline, &list, list) {
1474 struct pblk_emeta *emeta = line->emeta;
1475
1476 while (emeta->mem < lm->emeta_len[0]) {
1477 int ret;
1478
1479 ret = pblk_submit_meta_io(pblk, line);
1480 if (ret) {
1481 pblk_err(pblk, "sync meta line %d failed (%d)\n",
1482 line->id, ret);
1483 return;
1484 }
1485 }
1486 }
1487
1488 pblk_wait_for_meta(pblk);
1489 flush_workqueue(pblk->close_wq);
1490 }
1491
1492 void __pblk_pipeline_flush(struct pblk *pblk)
1493 {
1494 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1495 int ret;
1496
1497 spin_lock(&l_mg->free_lock);
1498 if (pblk->state == PBLK_STATE_RECOVERING ||
1499 pblk->state == PBLK_STATE_STOPPED) {
1500 spin_unlock(&l_mg->free_lock);
1501 return;
1502 }
1503 pblk->state = PBLK_STATE_RECOVERING;
1504 spin_unlock(&l_mg->free_lock);
1505
1506 pblk_flush_writer(pblk);
1507 pblk_wait_for_meta(pblk);
1508
1509 ret = pblk_recov_pad(pblk);
1510 if (ret) {
1511 pblk_err(pblk, "could not close data on teardown(%d)\n", ret);
1512 return;
1513 }
1514
1515 flush_workqueue(pblk->bb_wq);
1516 pblk_line_close_meta_sync(pblk);
1517 }
1518
1519 void __pblk_pipeline_stop(struct pblk *pblk)
1520 {
1521 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1522
1523 spin_lock(&l_mg->free_lock);
1524 pblk->state = PBLK_STATE_STOPPED;
1525 l_mg->data_line = NULL;
1526 l_mg->data_next = NULL;
1527 spin_unlock(&l_mg->free_lock);
1528 }
1529
1530 void pblk_pipeline_stop(struct pblk *pblk)
1531 {
1532 __pblk_pipeline_flush(pblk);
1533 __pblk_pipeline_stop(pblk);
1534 }
1535
1536 struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
1537 {
1538 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1539 struct pblk_line *cur, *new = NULL;
1540 unsigned int left_seblks;
1541
1542 cur = l_mg->data_line;
1543 new = l_mg->data_next;
1544 if (!new)
1545 goto out;
1546 l_mg->data_line = new;
1547
1548 spin_lock(&l_mg->free_lock);
1549 pblk_line_setup_metadata(new, l_mg, &pblk->lm);
1550 spin_unlock(&l_mg->free_lock);
1551
1552 retry_erase:
1553 left_seblks = atomic_read(&new->left_seblks);
1554 if (left_seblks) {
1555 /* If line is not fully erased, erase it */
1556 if (atomic_read(&new->left_eblks)) {
1557 if (pblk_line_erase(pblk, new))
1558 goto out;
1559 } else {
1560 io_schedule();
1561 }
1562 goto retry_erase;
1563 }
1564
1565 if (pblk_line_alloc_bitmaps(pblk, new))
1566 return NULL;
1567
1568 retry_setup:
1569 if (!pblk_line_init_metadata(pblk, new, cur)) {
1570 new = pblk_line_retry(pblk, new);
1571 if (!new)
1572 goto out;
1573
1574 goto retry_setup;
1575 }
1576
1577 if (!pblk_line_init_bb(pblk, new, 1)) {
1578 new = pblk_line_retry(pblk, new);
1579 if (!new)
1580 goto out;
1581
1582 goto retry_setup;
1583 }
1584
1585 pblk_rl_free_lines_dec(&pblk->rl, new, true);
1586
1587 /* Allocate next line for preparation */
1588 spin_lock(&l_mg->free_lock);
1589 l_mg->data_next = pblk_line_get(pblk);
1590 if (!l_mg->data_next) {
1591 /* If we cannot get a new line, we need to stop the pipeline.
1592 * Only allow as many writes in as we can store safely and then
1593 * fail gracefully
1594 */
1595 pblk_stop_writes(pblk, new);
1596 l_mg->data_next = NULL;
1597 } else {
1598 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
1599 l_mg->data_next->type = PBLK_LINETYPE_DATA;
1600 }
1601 spin_unlock(&l_mg->free_lock);
1602
1603 out:
1604 return new;
1605 }
1606
1607 static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
1608 {
1609 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1610 struct pblk_gc *gc = &pblk->gc;
1611
1612 spin_lock(&line->lock);
1613 WARN_ON(line->state != PBLK_LINESTATE_GC);
1614 line->state = PBLK_LINESTATE_FREE;
1615 line->gc_group = PBLK_LINEGC_NONE;
1616 pblk_line_free(line);
1617
1618 if (line->w_err_gc->has_write_err) {
1619 pblk_rl_werr_line_out(&pblk->rl);
1620 line->w_err_gc->has_write_err = 0;
1621 }
1622
1623 spin_unlock(&line->lock);
1624 atomic_dec(&gc->pipeline_gc);
1625
1626 spin_lock(&l_mg->free_lock);
1627 list_add_tail(&line->list, &l_mg->free_list);
1628 l_mg->nr_free_lines++;
1629 spin_unlock(&l_mg->free_lock);
1630
1631 pblk_rl_free_lines_inc(&pblk->rl, line);
1632 }
1633
1634 static void pblk_line_put_ws(struct work_struct *work)
1635 {
1636 struct pblk_line_ws *line_put_ws = container_of(work,
1637 struct pblk_line_ws, ws);
1638 struct pblk *pblk = line_put_ws->pblk;
1639 struct pblk_line *line = line_put_ws->line;
1640
1641 __pblk_line_put(pblk, line);
1642 mempool_free(line_put_ws, &pblk->gen_ws_pool);
1643 }
1644
1645 void pblk_line_put(struct kref *ref)
1646 {
1647 struct pblk_line *line = container_of(ref, struct pblk_line, ref);
1648 struct pblk *pblk = line->pblk;
1649
1650 __pblk_line_put(pblk, line);
1651 }
1652
1653 void pblk_line_put_wq(struct kref *ref)
1654 {
1655 struct pblk_line *line = container_of(ref, struct pblk_line, ref);
1656 struct pblk *pblk = line->pblk;
1657 struct pblk_line_ws *line_put_ws;
1658
1659 line_put_ws = mempool_alloc(&pblk->gen_ws_pool, GFP_ATOMIC);
1660 if (!line_put_ws)
1661 return;
1662
1663 line_put_ws->pblk = pblk;
1664 line_put_ws->line = line;
1665 line_put_ws->priv = NULL;
1666
1667 INIT_WORK(&line_put_ws->ws, pblk_line_put_ws);
1668 queue_work(pblk->r_end_wq, &line_put_ws->ws);
1669 }
1670
1671 int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
1672 {
1673 struct nvm_rq *rqd;
1674 int err;
1675
1676 rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);
1677
1678 pblk_setup_e_rq(pblk, rqd, ppa);
1679
1680 rqd->end_io = pblk_end_io_erase;
1681 rqd->private = pblk;
1682
1683 /* The write thread schedules erases so that it minimizes disturbances
1684 * with writes. Thus, there is no need to take the LUN semaphore.
1685 */
1686 err = pblk_submit_io(pblk, rqd);
1687 if (err) {
1688 struct nvm_tgt_dev *dev = pblk->dev;
1689 struct nvm_geo *geo = &dev->geo;
1690
1691 pblk_err(pblk, "could not async erase line:%d,blk:%d\n",
1692 pblk_ppa_to_line(ppa),
1693 pblk_ppa_to_pos(geo, ppa));
1694 }
1695
1696 return err;
1697 }
1698
1699 struct pblk_line *pblk_line_get_data(struct pblk *pblk)
1700 {
1701 return pblk->l_mg.data_line;
1702 }
1703
1704 /* For now, always erase next line */
1705 struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
1706 {
1707 return pblk->l_mg.data_next;
1708 }
1709
1710 int pblk_line_is_full(struct pblk_line *line)
1711 {
1712 return (line->left_msecs == 0);
1713 }
1714
1715 static void pblk_line_should_sync_meta(struct pblk *pblk)
1716 {
1717 if (pblk_rl_is_limit(&pblk->rl))
1718 pblk_line_close_meta_sync(pblk);
1719 }
1720
1721 void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
1722 {
1723 struct nvm_tgt_dev *dev = pblk->dev;
1724 struct nvm_geo *geo = &dev->geo;
1725 struct pblk_line_meta *lm = &pblk->lm;
1726 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1727 struct list_head *move_list;
1728 int i;
1729
1730 #ifdef CONFIG_NVM_PBLK_DEBUG
1731 WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
1732 "pblk: corrupt closed line %d\n", line->id);
1733 #endif
1734
1735 spin_lock(&l_mg->free_lock);
1736 WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap));
1737 spin_unlock(&l_mg->free_lock);
1738
1739 spin_lock(&l_mg->gc_lock);
1740 spin_lock(&line->lock);
1741 WARN_ON(line->state != PBLK_LINESTATE_OPEN);
1742 line->state = PBLK_LINESTATE_CLOSED;
1743 move_list = pblk_line_gc_list(pblk, line);
1744
1745 list_add_tail(&line->list, move_list);
1746
1747 kfree(line->map_bitmap);
1748 line->map_bitmap = NULL;
1749 line->smeta = NULL;
1750 line->emeta = NULL;
1751
1752 for (i = 0; i < lm->blk_per_line; i++) {
1753 struct pblk_lun *rlun = &pblk->luns[i];
1754 int pos = pblk_ppa_to_pos(geo, rlun->bppa);
1755 int state = line->chks[pos].state;
1756
1757 if (!(state & NVM_CHK_ST_OFFLINE))
1758 state = NVM_CHK_ST_CLOSED;
1759 }
1760
1761 spin_unlock(&line->lock);
1762 spin_unlock(&l_mg->gc_lock);
1763 }
1764
1765 void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
1766 {
1767 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1768 struct pblk_line_meta *lm = &pblk->lm;
1769 struct pblk_emeta *emeta = line->emeta;
1770 struct line_emeta *emeta_buf = emeta->buf;
1771 struct wa_counters *wa = emeta_to_wa(lm, emeta_buf);
1772
1773 /* No need for exact vsc value; avoid a big line lock and take aprox. */
1774 memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len);
1775 memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len);
1776
1777 wa->user = cpu_to_le64(atomic64_read(&pblk->user_wa));
1778 wa->pad = cpu_to_le64(atomic64_read(&pblk->pad_wa));
1779 wa->gc = cpu_to_le64(atomic64_read(&pblk->gc_wa));
1780
1781 emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas);
1782 emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf));
1783
1784 spin_lock(&l_mg->close_lock);
1785 spin_lock(&line->lock);
1786
1787 /* Update the in-memory start address for emeta, in case it has
1788 * shifted due to write errors
1789 */
1790 if (line->emeta_ssec != line->cur_sec)
1791 line->emeta_ssec = line->cur_sec;
1792
1793 list_add_tail(&line->list, &l_mg->emeta_list);
1794 spin_unlock(&line->lock);
1795 spin_unlock(&l_mg->close_lock);
1796
1797 pblk_line_should_sync_meta(pblk);
1798
1799
1800 }
1801
1802 static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
1803 {
1804 struct pblk_line_meta *lm = &pblk->lm;
1805 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1806 unsigned int lba_list_size = lm->emeta_len[2];
1807 struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
1808 struct pblk_emeta *emeta = line->emeta;
1809
1810 w_err_gc->lba_list = pblk_malloc(lba_list_size,
1811 l_mg->emeta_alloc_type, GFP_KERNEL);
1812 memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf),
1813 lba_list_size);
1814 }
1815
1816 void pblk_line_close_ws(struct work_struct *work)
1817 {
1818 struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
1819 ws);
1820 struct pblk *pblk = line_ws->pblk;
1821 struct pblk_line *line = line_ws->line;
1822 struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
1823
1824 /* Write errors makes the emeta start address stored in smeta invalid,
1825 * so keep a copy of the lba list until we've gc'd the line
1826 */
1827 if (w_err_gc->has_write_err)
1828 pblk_save_lba_list(pblk, line);
1829
1830 pblk_line_close(pblk, line);
1831 mempool_free(line_ws, &pblk->gen_ws_pool);
1832 }
1833
1834 void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
1835 void (*work)(struct work_struct *), gfp_t gfp_mask,
1836 struct workqueue_struct *wq)
1837 {
1838 struct pblk_line_ws *line_ws;
1839
1840 line_ws = mempool_alloc(&pblk->gen_ws_pool, gfp_mask);
1841
1842 line_ws->pblk = pblk;
1843 line_ws->line = line;
1844 line_ws->priv = priv;
1845
1846 INIT_WORK(&line_ws->ws, work);
1847 queue_work(wq, &line_ws->ws);
1848 }
1849
1850 static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
1851 int nr_ppas, int pos)
1852 {
1853 struct pblk_lun *rlun = &pblk->luns[pos];
1854 int ret;
1855
1856 /*
1857 * Only send one inflight I/O per LUN. Since we map at a page
1858 * granurality, all ppas in the I/O will map to the same LUN
1859 */
1860 #ifdef CONFIG_NVM_PBLK_DEBUG
1861 int i;
1862
1863 for (i = 1; i < nr_ppas; i++)
1864 WARN_ON(ppa_list[0].a.lun != ppa_list[i].a.lun ||
1865 ppa_list[0].a.ch != ppa_list[i].a.ch);
1866 #endif
1867
1868 ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
1869 if (ret == -ETIME || ret == -EINTR)
1870 pblk_err(pblk, "taking lun semaphore timed out: err %d\n",
1871 -ret);
1872 }
1873
1874 void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
1875 {
1876 struct nvm_tgt_dev *dev = pblk->dev;
1877 struct nvm_geo *geo = &dev->geo;
1878 int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1879
1880 __pblk_down_page(pblk, ppa_list, nr_ppas, pos);
1881 }
1882
1883 void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
1884 unsigned long *lun_bitmap)
1885 {
1886 struct nvm_tgt_dev *dev = pblk->dev;
1887 struct nvm_geo *geo = &dev->geo;
1888 int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1889
1890 /* If the LUN has been locked for this same request, do no attempt to
1891 * lock it again
1892 */
1893 if (test_and_set_bit(pos, lun_bitmap))
1894 return;
1895
1896 __pblk_down_page(pblk, ppa_list, nr_ppas, pos);
1897 }
1898
1899 void pblk_up_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
1900 {
1901 struct nvm_tgt_dev *dev = pblk->dev;
1902 struct nvm_geo *geo = &dev->geo;
1903 struct pblk_lun *rlun;
1904 int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1905
1906 #ifdef CONFIG_NVM_PBLK_DEBUG
1907 int i;
1908
1909 for (i = 1; i < nr_ppas; i++)
1910 WARN_ON(ppa_list[0].a.lun != ppa_list[i].a.lun ||
1911 ppa_list[0].a.ch != ppa_list[i].a.ch);
1912 #endif
1913
1914 rlun = &pblk->luns[pos];
1915 up(&rlun->wr_sem);
1916 }
1917
1918 void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
1919 unsigned long *lun_bitmap)
1920 {
1921 struct nvm_tgt_dev *dev = pblk->dev;
1922 struct nvm_geo *geo = &dev->geo;
1923 struct pblk_lun *rlun;
1924 int num_lun = geo->all_luns;
1925 int bit = -1;
1926
1927 while ((bit = find_next_bit(lun_bitmap, num_lun, bit + 1)) < num_lun) {
1928 rlun = &pblk->luns[bit];
1929 up(&rlun->wr_sem);
1930 }
1931 }
1932
1933 void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
1934 {
1935 struct ppa_addr ppa_l2p;
1936
1937 /* logic error: lba out-of-bounds. Ignore update */
1938 if (!(lba < pblk->rl.nr_secs)) {
1939 WARN(1, "pblk: corrupted L2P map request\n");
1940 return;
1941 }
1942
1943 spin_lock(&pblk->trans_lock);
1944 ppa_l2p = pblk_trans_map_get(pblk, lba);
1945
1946 if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p))
1947 pblk_map_invalidate(pblk, ppa_l2p);
1948
1949 pblk_trans_map_set(pblk, lba, ppa);
1950 spin_unlock(&pblk->trans_lock);
1951 }
1952
1953 void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
1954 {
1955
1956 #ifdef CONFIG_NVM_PBLK_DEBUG
1957 /* Callers must ensure that the ppa points to a cache address */
1958 BUG_ON(!pblk_addr_in_cache(ppa));
1959 BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
1960 #endif
1961
1962 pblk_update_map(pblk, lba, ppa);
1963 }
1964
1965 int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
1966 struct pblk_line *gc_line, u64 paddr_gc)
1967 {
1968 struct ppa_addr ppa_l2p, ppa_gc;
1969 int ret = 1;
1970
1971 #ifdef CONFIG_NVM_PBLK_DEBUG
1972 /* Callers must ensure that the ppa points to a cache address */
1973 BUG_ON(!pblk_addr_in_cache(ppa_new));
1974 BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new)));
1975 #endif
1976
1977 /* logic error: lba out-of-bounds. Ignore update */
1978 if (!(lba < pblk->rl.nr_secs)) {
1979 WARN(1, "pblk: corrupted L2P map request\n");
1980 return 0;
1981 }
1982
1983 spin_lock(&pblk->trans_lock);
1984 ppa_l2p = pblk_trans_map_get(pblk, lba);
1985 ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id);
1986
1987 if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) {
1988 spin_lock(&gc_line->lock);
1989 WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap),
1990 "pblk: corrupted GC update");
1991 spin_unlock(&gc_line->lock);
1992
1993 ret = 0;
1994 goto out;
1995 }
1996
1997 pblk_trans_map_set(pblk, lba, ppa_new);
1998 out:
1999 spin_unlock(&pblk->trans_lock);
2000 return ret;
2001 }
2002
2003 void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
2004 struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache)
2005 {
2006 struct ppa_addr ppa_l2p;
2007
2008 #ifdef CONFIG_NVM_PBLK_DEBUG
2009 /* Callers must ensure that the ppa points to a device address */
2010 BUG_ON(pblk_addr_in_cache(ppa_mapped));
2011 #endif
2012 /* Invalidate and discard padded entries */
2013 if (lba == ADDR_EMPTY) {
2014 atomic64_inc(&pblk->pad_wa);
2015 #ifdef CONFIG_NVM_PBLK_DEBUG
2016 atomic_long_inc(&pblk->padded_wb);
2017 #endif
2018 if (!pblk_ppa_empty(ppa_mapped))
2019 pblk_map_invalidate(pblk, ppa_mapped);
2020 return;
2021 }
2022
2023 /* logic error: lba out-of-bounds. Ignore update */
2024 if (!(lba < pblk->rl.nr_secs)) {
2025 WARN(1, "pblk: corrupted L2P map request\n");
2026 return;
2027 }
2028
2029 spin_lock(&pblk->trans_lock);
2030 ppa_l2p = pblk_trans_map_get(pblk, lba);
2031
2032 /* Do not update L2P if the cacheline has been updated. In this case,
2033 * the mapped ppa must be invalidated
2034 */
2035 if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) {
2036 if (!pblk_ppa_empty(ppa_mapped))
2037 pblk_map_invalidate(pblk, ppa_mapped);
2038 goto out;
2039 }
2040
2041 #ifdef CONFIG_NVM_PBLK_DEBUG
2042 WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p));
2043 #endif
2044
2045 pblk_trans_map_set(pblk, lba, ppa_mapped);
2046 out:
2047 spin_unlock(&pblk->trans_lock);
2048 }
2049
2050 void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
2051 sector_t blba, int nr_secs)
2052 {
2053 int i;
2054
2055 spin_lock(&pblk->trans_lock);
2056 for (i = 0; i < nr_secs; i++) {
2057 struct ppa_addr ppa;
2058
2059 ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i);
2060
2061 /* If the L2P entry maps to a line, the reference is valid */
2062 if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) {
2063 int line_id = pblk_ppa_to_line(ppa);
2064 struct pblk_line *line = &pblk->lines[line_id];
2065
2066 kref_get(&line->ref);
2067 }
2068 }
2069 spin_unlock(&pblk->trans_lock);
2070 }
2071
2072 void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
2073 u64 *lba_list, int nr_secs)
2074 {
2075 u64 lba;
2076 int i;
2077
2078 spin_lock(&pblk->trans_lock);
2079 for (i = 0; i < nr_secs; i++) {
2080 lba = lba_list[i];
2081 if (lba != ADDR_EMPTY) {
2082 /* logic error: lba out-of-bounds. Ignore update */
2083 if (!(lba < pblk->rl.nr_secs)) {
2084 WARN(1, "pblk: corrupted L2P map request\n");
2085 continue;
2086 }
2087 ppas[i] = pblk_trans_map_get(pblk, lba);
2088 }
2089 }
2090 spin_unlock(&pblk->trans_lock);
2091 }
Linux with added FPC-III support