1 /*
2 * Copyright (C) 2016 CNEX Labs
3 * Initial: Javier Gonzalez <javier@cnexlabs.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version
7 * 2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * pblk-recovery.c - pblk's recovery path
15 */
16
17 #include "pblk.h"
18
pblk_recov_check_emeta(struct pblk * pblk,struct line_emeta * emeta_buf)19 int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf)
20 {
21 u32 crc;
22
23 crc = pblk_calc_emeta_crc(pblk, emeta_buf);
24 if (le32_to_cpu(emeta_buf->crc) != crc)
25 return 1;
26
27 if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC)
28 return 1;
29
30 return 0;
31 }
32
pblk_recov_l2p_from_emeta(struct pblk * pblk,struct pblk_line * line)33 static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line)
34 {
35 struct nvm_tgt_dev *dev = pblk->dev;
36 struct nvm_geo *geo = &dev->geo;
37 struct pblk_line_meta *lm = &pblk->lm;
38 struct pblk_emeta *emeta = line->emeta;
39 struct line_emeta *emeta_buf = emeta->buf;
40 __le64 *lba_list;
41 u64 data_start, data_end;
42 u64 nr_valid_lbas, nr_lbas = 0;
43 u64 i;
44
45 lba_list = emeta_to_lbas(pblk, emeta_buf);
46 if (!lba_list)
47 return 1;
48
49 data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec;
50 data_end = line->emeta_ssec;
51 nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas);
52
53 for (i = data_start; i < data_end; i++) {
54 struct ppa_addr ppa;
55 int pos;
56
57 ppa = addr_to_gen_ppa(pblk, i, line->id);
58 pos = pblk_ppa_to_pos(geo, ppa);
59
60 /* Do not update bad blocks */
61 if (test_bit(pos, line->blk_bitmap))
62 continue;
63
64 if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) {
65 spin_lock(&line->lock);
66 if (test_and_set_bit(i, line->invalid_bitmap))
67 WARN_ONCE(1, "pblk: rec. double invalidate:\n");
68 else
69 le32_add_cpu(line->vsc, -1);
70 spin_unlock(&line->lock);
71
72 continue;
73 }
74
75 pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa);
76 nr_lbas++;
77 }
78
79 if (nr_valid_lbas != nr_lbas)
80 pblk_err(pblk, "line %d - inconsistent lba list(%llu/%llu)\n",
81 line->id, nr_valid_lbas, nr_lbas);
82
83 line->left_msecs = 0;
84
85 return 0;
86 }
87
pblk_calc_sec_in_line(struct pblk * pblk,struct pblk_line * line)88 static int pblk_calc_sec_in_line(struct pblk *pblk, struct pblk_line *line)
89 {
90 struct nvm_tgt_dev *dev = pblk->dev;
91 struct nvm_geo *geo = &dev->geo;
92 struct pblk_line_meta *lm = &pblk->lm;
93 int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line);
94
95 return lm->sec_per_line - lm->smeta_sec - lm->emeta_sec[0] -
96 nr_bb * geo->clba;
97 }
98
99 struct pblk_recov_alloc {
100 struct ppa_addr *ppa_list;
101 struct pblk_sec_meta *meta_list;
102 struct nvm_rq *rqd;
103 void *data;
104 dma_addr_t dma_ppa_list;
105 dma_addr_t dma_meta_list;
106 };
107
pblk_recov_read_oob(struct pblk * pblk,struct pblk_line * line,struct pblk_recov_alloc p,u64 r_ptr)108 static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line,
109 struct pblk_recov_alloc p, u64 r_ptr)
110 {
111 struct nvm_tgt_dev *dev = pblk->dev;
112 struct nvm_geo *geo = &dev->geo;
113 struct ppa_addr *ppa_list;
114 struct pblk_sec_meta *meta_list;
115 struct nvm_rq *rqd;
116 struct bio *bio;
117 void *data;
118 dma_addr_t dma_ppa_list, dma_meta_list;
119 u64 r_ptr_int;
120 int left_ppas;
121 int rq_ppas, rq_len;
122 int i, j;
123 int ret = 0;
124
125 ppa_list = p.ppa_list;
126 meta_list = p.meta_list;
127 rqd = p.rqd;
128 data = p.data;
129 dma_ppa_list = p.dma_ppa_list;
130 dma_meta_list = p.dma_meta_list;
131
132 left_ppas = line->cur_sec - r_ptr;
133 if (!left_ppas)
134 return 0;
135
136 r_ptr_int = r_ptr;
137
138 next_read_rq:
139 memset(rqd, 0, pblk_g_rq_size);
140
141 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
142 if (!rq_ppas)
143 rq_ppas = pblk->min_write_pgs;
144 rq_len = rq_ppas * geo->csecs;
145
146 bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
147 if (IS_ERR(bio))
148 return PTR_ERR(bio);
149
150 bio->bi_iter.bi_sector = 0; /* internal bio */
151 bio_set_op_attrs(bio, REQ_OP_READ, 0);
152
153 rqd->bio = bio;
154 rqd->opcode = NVM_OP_PREAD;
155 rqd->meta_list = meta_list;
156 rqd->nr_ppas = rq_ppas;
157 rqd->ppa_list = ppa_list;
158 rqd->dma_ppa_list = dma_ppa_list;
159 rqd->dma_meta_list = dma_meta_list;
160
161 if (pblk_io_aligned(pblk, rq_ppas))
162 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
163 else
164 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
165
166 for (i = 0; i < rqd->nr_ppas; ) {
167 struct ppa_addr ppa;
168 int pos;
169
170 ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
171 pos = pblk_ppa_to_pos(geo, ppa);
172
173 while (test_bit(pos, line->blk_bitmap)) {
174 r_ptr_int += pblk->min_write_pgs;
175 ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
176 pos = pblk_ppa_to_pos(geo, ppa);
177 }
178
179 for (j = 0; j < pblk->min_write_pgs; j++, i++, r_ptr_int++)
180 rqd->ppa_list[i] =
181 addr_to_gen_ppa(pblk, r_ptr_int, line->id);
182 }
183
184 /* If read fails, more padding is needed */
185 ret = pblk_submit_io_sync(pblk, rqd);
186 if (ret) {
187 pblk_err(pblk, "I/O submission failed: %d\n", ret);
188 return ret;
189 }
190
191 atomic_dec(&pblk->inflight_io);
192
193 /* At this point, the read should not fail. If it does, it is a problem
194 * we cannot recover from here. Need FTL log.
195 */
196 if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) {
197 pblk_err(pblk, "L2P recovery failed (%d)\n", rqd->error);
198 return -EINTR;
199 }
200
201 for (i = 0; i < rqd->nr_ppas; i++) {
202 u64 lba = le64_to_cpu(meta_list[i].lba);
203
204 if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
205 continue;
206
207 pblk_update_map(pblk, lba, rqd->ppa_list[i]);
208 }
209
210 left_ppas -= rq_ppas;
211 if (left_ppas > 0)
212 goto next_read_rq;
213
214 return 0;
215 }
216
pblk_recov_complete(struct kref * ref)217 static void pblk_recov_complete(struct kref *ref)
218 {
219 struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref);
220
221 complete(&pad_rq->wait);
222 }
223
pblk_end_io_recov(struct nvm_rq * rqd)224 static void pblk_end_io_recov(struct nvm_rq *rqd)
225 {
226 struct pblk_pad_rq *pad_rq = rqd->private;
227 struct pblk *pblk = pad_rq->pblk;
228
229 pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
230
231 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
232
233 atomic_dec(&pblk->inflight_io);
234 kref_put(&pad_rq->ref, pblk_recov_complete);
235 }
236
pblk_recov_pad_oob(struct pblk * pblk,struct pblk_line * line,int left_ppas)237 static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
238 int left_ppas)
239 {
240 struct nvm_tgt_dev *dev = pblk->dev;
241 struct nvm_geo *geo = &dev->geo;
242 struct ppa_addr *ppa_list;
243 struct pblk_sec_meta *meta_list;
244 struct pblk_pad_rq *pad_rq;
245 struct nvm_rq *rqd;
246 struct bio *bio;
247 void *data;
248 dma_addr_t dma_ppa_list, dma_meta_list;
249 __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
250 u64 w_ptr = line->cur_sec;
251 int left_line_ppas, rq_ppas, rq_len;
252 int i, j;
253 int ret = 0;
254
255 spin_lock(&line->lock);
256 left_line_ppas = line->left_msecs;
257 spin_unlock(&line->lock);
258
259 pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL);
260 if (!pad_rq)
261 return -ENOMEM;
262
263 data = vzalloc(array_size(pblk->max_write_pgs, geo->csecs));
264 if (!data) {
265 ret = -ENOMEM;
266 goto free_rq;
267 }
268
269 pad_rq->pblk = pblk;
270 init_completion(&pad_rq->wait);
271 kref_init(&pad_rq->ref);
272
273 next_pad_rq:
274 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
275 if (rq_ppas < pblk->min_write_pgs) {
276 pblk_err(pblk, "corrupted pad line %d\n", line->id);
277 goto fail_free_pad;
278 }
279
280 rq_len = rq_ppas * geo->csecs;
281
282 meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
283 if (!meta_list) {
284 ret = -ENOMEM;
285 goto fail_free_pad;
286 }
287
288 ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
289 dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
290
291 bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
292 PBLK_VMALLOC_META, GFP_KERNEL);
293 if (IS_ERR(bio)) {
294 ret = PTR_ERR(bio);
295 goto fail_free_meta;
296 }
297
298 bio->bi_iter.bi_sector = 0; /* internal bio */
299 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
300
301 rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
302
303 rqd->bio = bio;
304 rqd->opcode = NVM_OP_PWRITE;
305 rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
306 rqd->meta_list = meta_list;
307 rqd->nr_ppas = rq_ppas;
308 rqd->ppa_list = ppa_list;
309 rqd->dma_ppa_list = dma_ppa_list;
310 rqd->dma_meta_list = dma_meta_list;
311 rqd->end_io = pblk_end_io_recov;
312 rqd->private = pad_rq;
313
314 for (i = 0; i < rqd->nr_ppas; ) {
315 struct ppa_addr ppa;
316 int pos;
317
318 w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
319 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
320 pos = pblk_ppa_to_pos(geo, ppa);
321
322 while (test_bit(pos, line->blk_bitmap)) {
323 w_ptr += pblk->min_write_pgs;
324 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
325 pos = pblk_ppa_to_pos(geo, ppa);
326 }
327
328 for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) {
329 struct ppa_addr dev_ppa;
330 __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
331
332 dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
333
334 pblk_map_invalidate(pblk, dev_ppa);
335 lba_list[w_ptr] = meta_list[i].lba = addr_empty;
336 rqd->ppa_list[i] = dev_ppa;
337 }
338 }
339
340 kref_get(&pad_rq->ref);
341 pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas);
342
343 ret = pblk_submit_io(pblk, rqd);
344 if (ret) {
345 pblk_err(pblk, "I/O submission failed: %d\n", ret);
346 pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
347 goto fail_free_bio;
348 }
349
350 left_line_ppas -= rq_ppas;
351 left_ppas -= rq_ppas;
352 if (left_ppas && left_line_ppas)
353 goto next_pad_rq;
354
355 kref_put(&pad_rq->ref, pblk_recov_complete);
356
357 if (!wait_for_completion_io_timeout(&pad_rq->wait,
358 msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
359 pblk_err(pblk, "pad write timed out\n");
360 ret = -ETIME;
361 }
362
363 if (!pblk_line_is_full(line))
364 pblk_err(pblk, "corrupted padded line: %d\n", line->id);
365
366 vfree(data);
367 free_rq:
368 kfree(pad_rq);
369 return ret;
370
371 fail_free_bio:
372 bio_put(bio);
373 fail_free_meta:
374 nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
375 fail_free_pad:
376 kfree(pad_rq);
377 vfree(data);
378 return ret;
379 }
380
381 /* When this function is called, it means that not all upper pages have been
382 * written in a page that contains valid data. In order to recover this data, we
383 * first find the write pointer on the device, then we pad all necessary
384 * sectors, and finally attempt to read the valid data
385 */
pblk_recov_scan_all_oob(struct pblk * pblk,struct pblk_line * line,struct pblk_recov_alloc p)386 static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
387 struct pblk_recov_alloc p)
388 {
389 struct nvm_tgt_dev *dev = pblk->dev;
390 struct nvm_geo *geo = &dev->geo;
391 struct ppa_addr *ppa_list;
392 struct pblk_sec_meta *meta_list;
393 struct nvm_rq *rqd;
394 struct bio *bio;
395 void *data;
396 dma_addr_t dma_ppa_list, dma_meta_list;
397 u64 w_ptr = 0, r_ptr;
398 int rq_ppas, rq_len;
399 int i, j;
400 int ret = 0;
401 int rec_round;
402 int left_ppas = pblk_calc_sec_in_line(pblk, line) - line->cur_sec;
403
404 ppa_list = p.ppa_list;
405 meta_list = p.meta_list;
406 rqd = p.rqd;
407 data = p.data;
408 dma_ppa_list = p.dma_ppa_list;
409 dma_meta_list = p.dma_meta_list;
410
411 /* we could recover up until the line write pointer */
412 r_ptr = line->cur_sec;
413 rec_round = 0;
414
415 next_rq:
416 memset(rqd, 0, pblk_g_rq_size);
417
418 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
419 if (!rq_ppas)
420 rq_ppas = pblk->min_write_pgs;
421 rq_len = rq_ppas * geo->csecs;
422
423 bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
424 if (IS_ERR(bio))
425 return PTR_ERR(bio);
426
427 bio->bi_iter.bi_sector = 0; /* internal bio */
428 bio_set_op_attrs(bio, REQ_OP_READ, 0);
429
430 rqd->bio = bio;
431 rqd->opcode = NVM_OP_PREAD;
432 rqd->meta_list = meta_list;
433 rqd->nr_ppas = rq_ppas;
434 rqd->ppa_list = ppa_list;
435 rqd->dma_ppa_list = dma_ppa_list;
436 rqd->dma_meta_list = dma_meta_list;
437
438 if (pblk_io_aligned(pblk, rq_ppas))
439 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
440 else
441 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
442
443 for (i = 0; i < rqd->nr_ppas; ) {
444 struct ppa_addr ppa;
445 int pos;
446
447 w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
448 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
449 pos = pblk_ppa_to_pos(geo, ppa);
450
451 while (test_bit(pos, line->blk_bitmap)) {
452 w_ptr += pblk->min_write_pgs;
453 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
454 pos = pblk_ppa_to_pos(geo, ppa);
455 }
456
457 for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++)
458 rqd->ppa_list[i] =
459 addr_to_gen_ppa(pblk, w_ptr, line->id);
460 }
461
462 ret = pblk_submit_io_sync(pblk, rqd);
463 if (ret) {
464 pblk_err(pblk, "I/O submission failed: %d\n", ret);
465 return ret;
466 }
467
468 atomic_dec(&pblk->inflight_io);
469
470 /* This should not happen since the read failed during normal recovery,
471 * but the media works funny sometimes...
472 */
473 if (!rec_round++ && !rqd->error) {
474 rec_round = 0;
475 for (i = 0; i < rqd->nr_ppas; i++, r_ptr++) {
476 u64 lba = le64_to_cpu(meta_list[i].lba);
477
478 if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
479 continue;
480
481 pblk_update_map(pblk, lba, rqd->ppa_list[i]);
482 }
483 }
484
485 /* Reached the end of the written line */
486 if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
487 int pad_secs, nr_error_bits, bit;
488 int ret;
489
490 bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas);
491 nr_error_bits = rqd->nr_ppas - bit;
492
493 /* Roll back failed sectors */
494 line->cur_sec -= nr_error_bits;
495 line->left_msecs += nr_error_bits;
496 bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
497
498 pad_secs = pblk_pad_distance(pblk);
499 if (pad_secs > line->left_msecs)
500 pad_secs = line->left_msecs;
501
502 ret = pblk_recov_pad_oob(pblk, line, pad_secs);
503 if (ret)
504 pblk_err(pblk, "OOB padding failed (err:%d)\n", ret);
505
506 ret = pblk_recov_read_oob(pblk, line, p, r_ptr);
507 if (ret)
508 pblk_err(pblk, "OOB read failed (err:%d)\n", ret);
509
510 left_ppas = 0;
511 }
512
513 left_ppas -= rq_ppas;
514 if (left_ppas > 0)
515 goto next_rq;
516
517 return ret;
518 }
519
pblk_recov_scan_oob(struct pblk * pblk,struct pblk_line * line,struct pblk_recov_alloc p,int * done)520 static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
521 struct pblk_recov_alloc p, int *done)
522 {
523 struct nvm_tgt_dev *dev = pblk->dev;
524 struct nvm_geo *geo = &dev->geo;
525 struct ppa_addr *ppa_list;
526 struct pblk_sec_meta *meta_list;
527 struct nvm_rq *rqd;
528 struct bio *bio;
529 void *data;
530 dma_addr_t dma_ppa_list, dma_meta_list;
531 u64 paddr;
532 int rq_ppas, rq_len;
533 int i, j;
534 int ret = 0;
535 int left_ppas = pblk_calc_sec_in_line(pblk, line);
536
537 ppa_list = p.ppa_list;
538 meta_list = p.meta_list;
539 rqd = p.rqd;
540 data = p.data;
541 dma_ppa_list = p.dma_ppa_list;
542 dma_meta_list = p.dma_meta_list;
543
544 *done = 1;
545
546 next_rq:
547 memset(rqd, 0, pblk_g_rq_size);
548
549 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
550 if (!rq_ppas)
551 rq_ppas = pblk->min_write_pgs;
552 rq_len = rq_ppas * geo->csecs;
553
554 bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
555 if (IS_ERR(bio))
556 return PTR_ERR(bio);
557
558 bio->bi_iter.bi_sector = 0; /* internal bio */
559 bio_set_op_attrs(bio, REQ_OP_READ, 0);
560
561 rqd->bio = bio;
562 rqd->opcode = NVM_OP_PREAD;
563 rqd->meta_list = meta_list;
564 rqd->nr_ppas = rq_ppas;
565 rqd->ppa_list = ppa_list;
566 rqd->dma_ppa_list = dma_ppa_list;
567 rqd->dma_meta_list = dma_meta_list;
568
569 if (pblk_io_aligned(pblk, rq_ppas))
570 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
571 else
572 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
573
574 for (i = 0; i < rqd->nr_ppas; ) {
575 struct ppa_addr ppa;
576 int pos;
577
578 paddr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
579 ppa = addr_to_gen_ppa(pblk, paddr, line->id);
580 pos = pblk_ppa_to_pos(geo, ppa);
581
582 while (test_bit(pos, line->blk_bitmap)) {
583 paddr += pblk->min_write_pgs;
584 ppa = addr_to_gen_ppa(pblk, paddr, line->id);
585 pos = pblk_ppa_to_pos(geo, ppa);
586 }
587
588 for (j = 0; j < pblk->min_write_pgs; j++, i++, paddr++)
589 rqd->ppa_list[i] =
590 addr_to_gen_ppa(pblk, paddr, line->id);
591 }
592
593 ret = pblk_submit_io_sync(pblk, rqd);
594 if (ret) {
595 pblk_err(pblk, "I/O submission failed: %d\n", ret);
596 bio_put(bio);
597 return ret;
598 }
599
600 atomic_dec(&pblk->inflight_io);
601
602 /* Reached the end of the written line */
603 if (rqd->error) {
604 int nr_error_bits, bit;
605
606 bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas);
607 nr_error_bits = rqd->nr_ppas - bit;
608
609 /* Roll back failed sectors */
610 line->cur_sec -= nr_error_bits;
611 line->left_msecs += nr_error_bits;
612 bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
613
614 left_ppas = 0;
615 rqd->nr_ppas = bit;
616
617 if (rqd->error != NVM_RSP_ERR_EMPTYPAGE)
618 *done = 0;
619 }
620
621 for (i = 0; i < rqd->nr_ppas; i++) {
622 u64 lba = le64_to_cpu(meta_list[i].lba);
623
624 if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
625 continue;
626
627 pblk_update_map(pblk, lba, rqd->ppa_list[i]);
628 }
629
630 left_ppas -= rq_ppas;
631 if (left_ppas > 0)
632 goto next_rq;
633
634 return ret;
635 }
636
637 /* Scan line for lbas on out of bound area */
pblk_recov_l2p_from_oob(struct pblk * pblk,struct pblk_line * line)638 static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line)
639 {
640 struct nvm_tgt_dev *dev = pblk->dev;
641 struct nvm_geo *geo = &dev->geo;
642 struct nvm_rq *rqd;
643 struct ppa_addr *ppa_list;
644 struct pblk_sec_meta *meta_list;
645 struct pblk_recov_alloc p;
646 void *data;
647 dma_addr_t dma_ppa_list, dma_meta_list;
648 int done, ret = 0;
649
650 meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
651 if (!meta_list)
652 return -ENOMEM;
653
654 ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
655 dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
656
657 data = kcalloc(pblk->max_write_pgs, geo->csecs, GFP_KERNEL);
658 if (!data) {
659 ret = -ENOMEM;
660 goto free_meta_list;
661 }
662
663 rqd = pblk_alloc_rqd(pblk, PBLK_READ);
664
665 p.ppa_list = ppa_list;
666 p.meta_list = meta_list;
667 p.rqd = rqd;
668 p.data = data;
669 p.dma_ppa_list = dma_ppa_list;
670 p.dma_meta_list = dma_meta_list;
671
672 ret = pblk_recov_scan_oob(pblk, line, p, &done);
673 if (ret) {
674 pblk_err(pblk, "could not recover L2P from OOB\n");
675 goto out;
676 }
677
678 if (!done) {
679 ret = pblk_recov_scan_all_oob(pblk, line, p);
680 if (ret) {
681 pblk_err(pblk, "could not recover L2P from OOB\n");
682 goto out;
683 }
684 }
685
686 if (pblk_line_is_full(line))
687 pblk_line_recov_close(pblk, line);
688
689 out:
690 kfree(data);
691 free_meta_list:
692 nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
693
694 return ret;
695 }
696
697 /* Insert lines ordered by sequence number (seq_num) on list */
pblk_recov_line_add_ordered(struct list_head * head,struct pblk_line * line)698 static void pblk_recov_line_add_ordered(struct list_head *head,
699 struct pblk_line *line)
700 {
701 struct pblk_line *t = NULL;
702
703 list_for_each_entry(t, head, list)
704 if (t->seq_nr > line->seq_nr)
705 break;
706
707 __list_add(&line->list, t->list.prev, &t->list);
708 }
709
pblk_line_emeta_start(struct pblk * pblk,struct pblk_line * line)710 static u64 pblk_line_emeta_start(struct pblk *pblk, struct pblk_line *line)
711 {
712 struct nvm_tgt_dev *dev = pblk->dev;
713 struct nvm_geo *geo = &dev->geo;
714 struct pblk_line_meta *lm = &pblk->lm;
715 unsigned int emeta_secs;
716 u64 emeta_start;
717 struct ppa_addr ppa;
718 int pos;
719
720 emeta_secs = lm->emeta_sec[0];
721 emeta_start = lm->sec_per_line;
722
723 while (emeta_secs) {
724 emeta_start--;
725 ppa = addr_to_gen_ppa(pblk, emeta_start, line->id);
726 pos = pblk_ppa_to_pos(geo, ppa);
727 if (!test_bit(pos, line->blk_bitmap))
728 emeta_secs--;
729 }
730
731 return emeta_start;
732 }
733
pblk_recov_check_line_version(struct pblk * pblk,struct line_emeta * emeta)734 static int pblk_recov_check_line_version(struct pblk *pblk,
735 struct line_emeta *emeta)
736 {
737 struct line_header *header = &emeta->header;
738
739 if (header->version_major != EMETA_VERSION_MAJOR) {
740 pblk_err(pblk, "line major version mismatch: %d, expected: %d\n",
741 header->version_major, EMETA_VERSION_MAJOR);
742 return 1;
743 }
744
745 #ifdef CONFIG_NVM_PBLK_DEBUG
746 if (header->version_minor > EMETA_VERSION_MINOR)
747 pblk_info(pblk, "newer line minor version found: %d\n",
748 header->version_minor);
749 #endif
750
751 return 0;
752 }
753
pblk_recov_wa_counters(struct pblk * pblk,struct line_emeta * emeta)754 static void pblk_recov_wa_counters(struct pblk *pblk,
755 struct line_emeta *emeta)
756 {
757 struct pblk_line_meta *lm = &pblk->lm;
758 struct line_header *header = &emeta->header;
759 struct wa_counters *wa = emeta_to_wa(lm, emeta);
760
761 /* WA counters were introduced in emeta version 0.2 */
762 if (header->version_major > 0 || header->version_minor >= 2) {
763 u64 user = le64_to_cpu(wa->user);
764 u64 pad = le64_to_cpu(wa->pad);
765 u64 gc = le64_to_cpu(wa->gc);
766
767 atomic64_set(&pblk->user_wa, user);
768 atomic64_set(&pblk->pad_wa, pad);
769 atomic64_set(&pblk->gc_wa, gc);
770
771 pblk->user_rst_wa = user;
772 pblk->pad_rst_wa = pad;
773 pblk->gc_rst_wa = gc;
774 }
775 }
776
pblk_line_was_written(struct pblk_line * line,struct pblk * pblk)777 static int pblk_line_was_written(struct pblk_line *line,
778 struct pblk *pblk)
779 {
780
781 struct pblk_line_meta *lm = &pblk->lm;
782 struct nvm_tgt_dev *dev = pblk->dev;
783 struct nvm_geo *geo = &dev->geo;
784 struct nvm_chk_meta *chunk;
785 struct ppa_addr bppa;
786 int smeta_blk;
787
788 if (line->state == PBLK_LINESTATE_BAD)
789 return 0;
790
791 smeta_blk = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
792 if (smeta_blk >= lm->blk_per_line)
793 return 0;
794
795 bppa = pblk->luns[smeta_blk].bppa;
796 chunk = &line->chks[pblk_ppa_to_pos(geo, bppa)];
797
798 if (chunk->state & NVM_CHK_ST_FREE)
799 return 0;
800
801 return 1;
802 }
803
pblk_recov_l2p(struct pblk * pblk)804 struct pblk_line *pblk_recov_l2p(struct pblk *pblk)
805 {
806 struct pblk_line_meta *lm = &pblk->lm;
807 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
808 struct pblk_line *line, *tline, *data_line = NULL;
809 struct pblk_smeta *smeta;
810 struct pblk_emeta *emeta;
811 struct line_smeta *smeta_buf;
812 int found_lines = 0, recovered_lines = 0, open_lines = 0;
813 int is_next = 0;
814 int meta_line;
815 int i, valid_uuid = 0;
816 LIST_HEAD(recov_list);
817
818 /* TODO: Implement FTL snapshot */
819
820 /* Scan recovery - takes place when FTL snapshot fails */
821 spin_lock(&l_mg->free_lock);
822 meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
823 set_bit(meta_line, &l_mg->meta_bitmap);
824 smeta = l_mg->sline_meta[meta_line];
825 emeta = l_mg->eline_meta[meta_line];
826 smeta_buf = (struct line_smeta *)smeta;
827 spin_unlock(&l_mg->free_lock);
828
829 /* Order data lines using their sequence number */
830 for (i = 0; i < l_mg->nr_lines; i++) {
831 u32 crc;
832
833 line = &pblk->lines[i];
834
835 memset(smeta, 0, lm->smeta_len);
836 line->smeta = smeta;
837 line->lun_bitmap = ((void *)(smeta_buf)) +
838 sizeof(struct line_smeta);
839
840 if (!pblk_line_was_written(line, pblk))
841 continue;
842
843 /* Lines that cannot be read are assumed as not written here */
844 if (pblk_line_read_smeta(pblk, line))
845 continue;
846
847 crc = pblk_calc_smeta_crc(pblk, smeta_buf);
848 if (le32_to_cpu(smeta_buf->crc) != crc)
849 continue;
850
851 if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC)
852 continue;
853
854 if (smeta_buf->header.version_major != SMETA_VERSION_MAJOR) {
855 pblk_err(pblk, "found incompatible line version %u\n",
856 smeta_buf->header.version_major);
857 return ERR_PTR(-EINVAL);
858 }
859
860 /* The first valid instance uuid is used for initialization */
861 if (!valid_uuid) {
862 memcpy(pblk->instance_uuid, smeta_buf->header.uuid, 16);
863 valid_uuid = 1;
864 }
865
866 if (memcmp(pblk->instance_uuid, smeta_buf->header.uuid, 16)) {
867 pblk_debug(pblk, "ignore line %u due to uuid mismatch\n",
868 i);
869 continue;
870 }
871
872 /* Update line metadata */
873 spin_lock(&line->lock);
874 line->id = le32_to_cpu(smeta_buf->header.id);
875 line->type = le16_to_cpu(smeta_buf->header.type);
876 line->seq_nr = le64_to_cpu(smeta_buf->seq_nr);
877 spin_unlock(&line->lock);
878
879 /* Update general metadata */
880 spin_lock(&l_mg->free_lock);
881 if (line->seq_nr >= l_mg->d_seq_nr)
882 l_mg->d_seq_nr = line->seq_nr + 1;
883 l_mg->nr_free_lines--;
884 spin_unlock(&l_mg->free_lock);
885
886 if (pblk_line_recov_alloc(pblk, line))
887 goto out;
888
889 pblk_recov_line_add_ordered(&recov_list, line);
890 found_lines++;
891 pblk_debug(pblk, "recovering data line %d, seq:%llu\n",
892 line->id, smeta_buf->seq_nr);
893 }
894
895 if (!found_lines) {
896 pblk_setup_uuid(pblk);
897
898 spin_lock(&l_mg->free_lock);
899 WARN_ON_ONCE(!test_and_clear_bit(meta_line,
900 &l_mg->meta_bitmap));
901 spin_unlock(&l_mg->free_lock);
902
903 goto out;
904 }
905
906 /* Verify closed blocks and recover this portion of L2P table*/
907 list_for_each_entry_safe(line, tline, &recov_list, list) {
908 recovered_lines++;
909
910 line->emeta_ssec = pblk_line_emeta_start(pblk, line);
911 line->emeta = emeta;
912 memset(line->emeta->buf, 0, lm->emeta_len[0]);
913
914 if (pblk_line_read_emeta(pblk, line, line->emeta->buf)) {
915 pblk_recov_l2p_from_oob(pblk, line);
916 goto next;
917 }
918
919 if (pblk_recov_check_emeta(pblk, line->emeta->buf)) {
920 pblk_recov_l2p_from_oob(pblk, line);
921 goto next;
922 }
923
924 if (pblk_recov_check_line_version(pblk, line->emeta->buf))
925 return ERR_PTR(-EINVAL);
926
927 pblk_recov_wa_counters(pblk, line->emeta->buf);
928
929 if (pblk_recov_l2p_from_emeta(pblk, line))
930 pblk_recov_l2p_from_oob(pblk, line);
931
932 next:
933 if (pblk_line_is_full(line)) {
934 struct list_head *move_list;
935
936 spin_lock(&line->lock);
937 line->state = PBLK_LINESTATE_CLOSED;
938 move_list = pblk_line_gc_list(pblk, line);
939 spin_unlock(&line->lock);
940
941 spin_lock(&l_mg->gc_lock);
942 list_move_tail(&line->list, move_list);
943 spin_unlock(&l_mg->gc_lock);
944
945 kfree(line->map_bitmap);
946 line->map_bitmap = NULL;
947 line->smeta = NULL;
948 line->emeta = NULL;
949 } else {
950 if (open_lines > 1)
951 pblk_err(pblk, "failed to recover L2P\n");
952
953 open_lines++;
954 line->meta_line = meta_line;
955 data_line = line;
956 }
957 }
958
959 if (!open_lines) {
960 spin_lock(&l_mg->free_lock);
961 WARN_ON_ONCE(!test_and_clear_bit(meta_line,
962 &l_mg->meta_bitmap));
963 spin_unlock(&l_mg->free_lock);
964 pblk_line_replace_data(pblk);
965 } else {
966 spin_lock(&l_mg->free_lock);
967 /* Allocate next line for preparation */
968 l_mg->data_next = pblk_line_get(pblk);
969 if (l_mg->data_next) {
970 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
971 l_mg->data_next->type = PBLK_LINETYPE_DATA;
972 is_next = 1;
973 }
974 spin_unlock(&l_mg->free_lock);
975 }
976
977 if (is_next)
978 pblk_line_erase(pblk, l_mg->data_next);
979
980 out:
981 if (found_lines != recovered_lines)
982 pblk_err(pblk, "failed to recover all found lines %d/%d\n",
983 found_lines, recovered_lines);
984
985 return data_line;
986 }
987
988 /*
989 * Pad current line
990 */
pblk_recov_pad(struct pblk * pblk)991 int pblk_recov_pad(struct pblk *pblk)
992 {
993 struct pblk_line *line;
994 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
995 int left_msecs;
996 int ret = 0;
997
998 spin_lock(&l_mg->free_lock);
999 line = l_mg->data_line;
1000 left_msecs = line->left_msecs;
1001 spin_unlock(&l_mg->free_lock);
1002
1003 ret = pblk_recov_pad_oob(pblk, line, left_msecs);
1004 if (ret) {
1005 pblk_err(pblk, "tear down padding failed (%d)\n", ret);
1006 return ret;
1007 }
1008
1009 pblk_line_close_meta(pblk, line);
1010 return ret;
1011 }
1012