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1 | /* |
2 | * Copyright (C) 2015 Matias Bjorling. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License version | |
6 | * 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
16 | * USA. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/lightnvm.h> | |
21 | ||
22 | #define MAX_SYSBLKS 3 /* remember to update mapping scheme on change */ | |
23 | #define MAX_BLKS_PR_SYSBLK 2 /* 2 blks with 256 pages and 3000 erases | |
24 | * enables ~1.5M updates per sysblk unit | |
25 | */ | |
26 | ||
27 | struct sysblk_scan { | |
28 | /* A row is a collection of flash blocks for a system block. */ | |
29 | int nr_rows; | |
30 | int row; | |
31 | int act_blk[MAX_SYSBLKS]; | |
32 | ||
33 | int nr_ppas; | |
34 | struct ppa_addr ppas[MAX_SYSBLKS * MAX_BLKS_PR_SYSBLK];/* all sysblks */ | |
35 | }; | |
36 | ||
37 | static inline int scan_ppa_idx(int row, int blkid) | |
38 | { | |
39 | return (row * MAX_BLKS_PR_SYSBLK) + blkid; | |
40 | } | |
41 | ||
42 | void nvm_sysblk_to_cpu(struct nvm_sb_info *info, struct nvm_system_block *sb) | |
43 | { | |
44 | info->seqnr = be32_to_cpu(sb->seqnr); | |
45 | info->erase_cnt = be32_to_cpu(sb->erase_cnt); | |
46 | info->version = be16_to_cpu(sb->version); | |
47 | strncpy(info->mmtype, sb->mmtype, NVM_MMTYPE_LEN); | |
48 | info->fs_ppa.ppa = be64_to_cpu(sb->fs_ppa); | |
49 | } | |
50 | ||
51 | void nvm_cpu_to_sysblk(struct nvm_system_block *sb, struct nvm_sb_info *info) | |
52 | { | |
53 | sb->magic = cpu_to_be32(NVM_SYSBLK_MAGIC); | |
54 | sb->seqnr = cpu_to_be32(info->seqnr); | |
55 | sb->erase_cnt = cpu_to_be32(info->erase_cnt); | |
56 | sb->version = cpu_to_be16(info->version); | |
57 | strncpy(sb->mmtype, info->mmtype, NVM_MMTYPE_LEN); | |
58 | sb->fs_ppa = cpu_to_be64(info->fs_ppa.ppa); | |
59 | } | |
60 | ||
61 | static int nvm_setup_sysblks(struct nvm_dev *dev, struct ppa_addr *sysblk_ppas) | |
62 | { | |
63 | int nr_rows = min_t(int, MAX_SYSBLKS, dev->nr_chnls); | |
64 | int i; | |
65 | ||
66 | for (i = 0; i < nr_rows; i++) | |
67 | sysblk_ppas[i].ppa = 0; | |
68 | ||
69 | /* if possible, place sysblk at first channel, middle channel and last | |
70 | * channel of the device. If not, create only one or two sys blocks | |
71 | */ | |
72 | switch (dev->nr_chnls) { | |
73 | case 2: | |
74 | sysblk_ppas[1].g.ch = 1; | |
75 | /* fall-through */ | |
76 | case 1: | |
77 | sysblk_ppas[0].g.ch = 0; | |
78 | break; | |
79 | default: | |
80 | sysblk_ppas[0].g.ch = 0; | |
81 | sysblk_ppas[1].g.ch = dev->nr_chnls / 2; | |
82 | sysblk_ppas[2].g.ch = dev->nr_chnls - 1; | |
83 | break; | |
84 | } | |
85 | ||
86 | return nr_rows; | |
87 | } | |
88 | ||
89 | void nvm_setup_sysblk_scan(struct nvm_dev *dev, struct sysblk_scan *s, | |
90 | struct ppa_addr *sysblk_ppas) | |
91 | { | |
92 | memset(s, 0, sizeof(struct sysblk_scan)); | |
93 | s->nr_rows = nvm_setup_sysblks(dev, sysblk_ppas); | |
94 | } | |
95 | ||
96 | static int sysblk_get_host_blks(struct ppa_addr ppa, int nr_blks, u8 *blks, | |
97 | void *private) | |
98 | { | |
99 | struct sysblk_scan *s = private; | |
100 | int i, nr_sysblk = 0; | |
101 | ||
102 | for (i = 0; i < nr_blks; i++) { | |
103 | if (blks[i] != NVM_BLK_T_HOST) | |
104 | continue; | |
105 | ||
106 | if (s->nr_ppas == MAX_BLKS_PR_SYSBLK * MAX_SYSBLKS) { | |
107 | pr_err("nvm: too many host blks\n"); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | ppa.g.blk = i; | |
112 | ||
113 | s->ppas[scan_ppa_idx(s->row, nr_sysblk)] = ppa; | |
114 | s->nr_ppas++; | |
115 | nr_sysblk++; | |
116 | } | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int nvm_get_all_sysblks(struct nvm_dev *dev, struct sysblk_scan *s, | |
122 | struct ppa_addr *ppas, nvm_bb_update_fn *fn) | |
123 | { | |
124 | struct ppa_addr dppa; | |
57aac2f1 | 125 | int i, ret = 0; |
e3eb3799 MB |
126 | |
127 | s->nr_ppas = 0; | |
128 | ||
129 | for (i = 0; i < s->nr_rows; i++) { | |
130 | dppa = generic_to_dev_addr(dev, ppas[i]); | |
131 | s->row = i; | |
132 | ||
133 | ret = dev->ops->get_bb_tbl(dev, dppa, dev->blks_per_lun, fn, s); | |
134 | if (ret) { | |
135 | pr_err("nvm: failed bb tbl for ppa (%u %u)\n", | |
136 | ppas[i].g.ch, | |
137 | ppas[i].g.blk); | |
138 | return ret; | |
139 | } | |
140 | } | |
141 | ||
142 | return ret; | |
143 | } | |
144 | ||
145 | /* | |
146 | * scans a block for latest sysblk. | |
147 | * Returns: | |
148 | * 0 - newer sysblk not found. PPA is updated to latest page. | |
149 | * 1 - newer sysblk found and stored in *cur. PPA is updated to | |
150 | * next valid page. | |
151 | * <0- error. | |
152 | */ | |
153 | static int nvm_scan_block(struct nvm_dev *dev, struct ppa_addr *ppa, | |
154 | struct nvm_system_block *sblk) | |
155 | { | |
156 | struct nvm_system_block *cur; | |
4891d120 | 157 | int pg, ret, found = 0; |
e3eb3799 MB |
158 | |
159 | /* the full buffer for a flash page is allocated. Only the first of it | |
160 | * contains the system block information | |
161 | */ | |
4891d120 | 162 | cur = kmalloc(dev->pfpg_size, GFP_KERNEL); |
e3eb3799 MB |
163 | if (!cur) |
164 | return -ENOMEM; | |
165 | ||
166 | /* perform linear scan through the block */ | |
167 | for (pg = 0; pg < dev->lps_per_blk; pg++) { | |
168 | ppa->g.pg = ppa_to_slc(dev, pg); | |
169 | ||
170 | ret = nvm_submit_ppa(dev, ppa, 1, NVM_OP_PREAD, NVM_IO_SLC_MODE, | |
4891d120 | 171 | cur, dev->pfpg_size); |
e3eb3799 MB |
172 | if (ret) { |
173 | if (ret == NVM_RSP_ERR_EMPTYPAGE) { | |
174 | pr_debug("nvm: sysblk scan empty ppa (%u %u %u %u)\n", | |
175 | ppa->g.ch, | |
176 | ppa->g.lun, | |
177 | ppa->g.blk, | |
178 | ppa->g.pg); | |
179 | break; | |
180 | } | |
181 | pr_err("nvm: read failed (%x) for ppa (%u %u %u %u)", | |
182 | ret, | |
183 | ppa->g.ch, | |
184 | ppa->g.lun, | |
185 | ppa->g.blk, | |
186 | ppa->g.pg); | |
187 | break; /* if we can't read a page, continue to the | |
188 | * next blk | |
189 | */ | |
190 | } | |
191 | ||
192 | if (be32_to_cpu(cur->magic) != NVM_SYSBLK_MAGIC) { | |
193 | pr_debug("nvm: scan break for ppa (%u %u %u %u)\n", | |
194 | ppa->g.ch, | |
195 | ppa->g.lun, | |
196 | ppa->g.blk, | |
197 | ppa->g.pg); | |
198 | break; /* last valid page already found */ | |
199 | } | |
200 | ||
201 | if (be32_to_cpu(cur->seqnr) < be32_to_cpu(sblk->seqnr)) | |
202 | continue; | |
203 | ||
204 | memcpy(sblk, cur, sizeof(struct nvm_system_block)); | |
205 | found = 1; | |
206 | } | |
207 | ||
208 | kfree(cur); | |
209 | ||
210 | return found; | |
211 | } | |
212 | ||
213 | static int nvm_set_bb_tbl(struct nvm_dev *dev, struct sysblk_scan *s, int type) | |
214 | { | |
215 | struct nvm_rq rqd; | |
216 | int ret; | |
217 | ||
218 | if (s->nr_ppas > dev->ops->max_phys_sect) { | |
219 | pr_err("nvm: unable to update all sysblocks atomically\n"); | |
220 | return -EINVAL; | |
221 | } | |
222 | ||
223 | memset(&rqd, 0, sizeof(struct nvm_rq)); | |
224 | ||
225 | nvm_set_rqd_ppalist(dev, &rqd, s->ppas, s->nr_ppas); | |
226 | nvm_generic_to_addr_mode(dev, &rqd); | |
227 | ||
228 | ret = dev->ops->set_bb_tbl(dev, &rqd, type); | |
229 | nvm_free_rqd_ppalist(dev, &rqd); | |
230 | if (ret) { | |
231 | pr_err("nvm: sysblk failed bb mark\n"); | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int sysblk_get_free_blks(struct ppa_addr ppa, int nr_blks, u8 *blks, | |
239 | void *private) | |
240 | { | |
241 | struct sysblk_scan *s = private; | |
242 | struct ppa_addr *sppa; | |
243 | int i, blkid = 0; | |
244 | ||
245 | for (i = 0; i < nr_blks; i++) { | |
246 | if (blks[i] == NVM_BLK_T_HOST) | |
247 | return -EEXIST; | |
248 | ||
249 | if (blks[i] != NVM_BLK_T_FREE) | |
250 | continue; | |
251 | ||
252 | sppa = &s->ppas[scan_ppa_idx(s->row, blkid)]; | |
253 | sppa->g.ch = ppa.g.ch; | |
254 | sppa->g.lun = ppa.g.lun; | |
255 | sppa->g.blk = i; | |
256 | s->nr_ppas++; | |
257 | blkid++; | |
258 | ||
259 | pr_debug("nvm: use (%u %u %u) as sysblk\n", | |
260 | sppa->g.ch, sppa->g.lun, sppa->g.blk); | |
261 | if (blkid > MAX_BLKS_PR_SYSBLK - 1) | |
262 | return 0; | |
263 | } | |
264 | ||
265 | pr_err("nvm: sysblk failed get sysblk\n"); | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | static int nvm_write_and_verify(struct nvm_dev *dev, struct nvm_sb_info *info, | |
270 | struct sysblk_scan *s) | |
271 | { | |
272 | struct nvm_system_block nvmsb; | |
273 | void *buf; | |
4891d120 | 274 | int i, sect, ret = 0; |
e3eb3799 MB |
275 | struct ppa_addr *ppas; |
276 | ||
277 | nvm_cpu_to_sysblk(&nvmsb, info); | |
278 | ||
4891d120 | 279 | buf = kzalloc(dev->pfpg_size, GFP_KERNEL); |
e3eb3799 MB |
280 | if (!buf) |
281 | return -ENOMEM; | |
282 | memcpy(buf, &nvmsb, sizeof(struct nvm_system_block)); | |
283 | ||
284 | ppas = kcalloc(dev->sec_per_pg, sizeof(struct ppa_addr), GFP_KERNEL); | |
285 | if (!ppas) { | |
286 | ret = -ENOMEM; | |
287 | goto err; | |
288 | } | |
289 | ||
290 | /* Write and verify */ | |
291 | for (i = 0; i < s->nr_rows; i++) { | |
292 | ppas[0] = s->ppas[scan_ppa_idx(i, s->act_blk[i])]; | |
293 | ||
294 | pr_debug("nvm: writing sysblk to ppa (%u %u %u %u)\n", | |
295 | ppas[0].g.ch, | |
296 | ppas[0].g.lun, | |
297 | ppas[0].g.blk, | |
298 | ppas[0].g.pg); | |
299 | ||
300 | /* Expand to all sectors within a flash page */ | |
301 | if (dev->sec_per_pg > 1) { | |
302 | for (sect = 1; sect < dev->sec_per_pg; sect++) { | |
303 | ppas[sect].ppa = ppas[0].ppa; | |
304 | ppas[sect].g.sec = sect; | |
305 | } | |
306 | } | |
307 | ||
308 | ret = nvm_submit_ppa(dev, ppas, dev->sec_per_pg, NVM_OP_PWRITE, | |
4891d120 | 309 | NVM_IO_SLC_MODE, buf, dev->pfpg_size); |
e3eb3799 MB |
310 | if (ret) { |
311 | pr_err("nvm: sysblk failed program (%u %u %u)\n", | |
312 | ppas[0].g.ch, | |
313 | ppas[0].g.lun, | |
314 | ppas[0].g.blk); | |
315 | break; | |
316 | } | |
317 | ||
318 | ret = nvm_submit_ppa(dev, ppas, dev->sec_per_pg, NVM_OP_PREAD, | |
4891d120 | 319 | NVM_IO_SLC_MODE, buf, dev->pfpg_size); |
e3eb3799 MB |
320 | if (ret) { |
321 | pr_err("nvm: sysblk failed read (%u %u %u)\n", | |
322 | ppas[0].g.ch, | |
323 | ppas[0].g.lun, | |
324 | ppas[0].g.blk); | |
325 | break; | |
326 | } | |
327 | ||
328 | if (memcmp(buf, &nvmsb, sizeof(struct nvm_system_block))) { | |
329 | pr_err("nvm: sysblk failed verify (%u %u %u)\n", | |
330 | ppas[0].g.ch, | |
331 | ppas[0].g.lun, | |
332 | ppas[0].g.blk); | |
333 | ret = -EINVAL; | |
334 | break; | |
335 | } | |
336 | } | |
337 | ||
338 | kfree(ppas); | |
339 | err: | |
340 | kfree(buf); | |
341 | ||
342 | return ret; | |
343 | } | |
344 | ||
345 | static int nvm_prepare_new_sysblks(struct nvm_dev *dev, struct sysblk_scan *s) | |
346 | { | |
347 | int i, ret; | |
348 | unsigned long nxt_blk; | |
349 | struct ppa_addr *ppa; | |
350 | ||
351 | for (i = 0; i < s->nr_rows; i++) { | |
352 | nxt_blk = (s->act_blk[i] + 1) % MAX_BLKS_PR_SYSBLK; | |
353 | ppa = &s->ppas[scan_ppa_idx(i, nxt_blk)]; | |
354 | ppa->g.pg = ppa_to_slc(dev, 0); | |
355 | ||
356 | ret = nvm_erase_ppa(dev, ppa, 1); | |
357 | if (ret) | |
358 | return ret; | |
359 | ||
360 | s->act_blk[i] = nxt_blk; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | int nvm_get_sysblock(struct nvm_dev *dev, struct nvm_sb_info *info) | |
367 | { | |
368 | struct ppa_addr sysblk_ppas[MAX_SYSBLKS]; | |
369 | struct sysblk_scan s; | |
370 | struct nvm_system_block *cur; | |
371 | int i, j, found = 0; | |
372 | int ret = -ENOMEM; | |
373 | ||
374 | /* | |
375 | * 1. setup sysblk locations | |
376 | * 2. get bad block list | |
377 | * 3. filter on host-specific (type 3) | |
378 | * 4. iterate through all and find the highest seq nr. | |
379 | * 5. return superblock information | |
380 | */ | |
381 | ||
382 | if (!dev->ops->get_bb_tbl) | |
383 | return -EINVAL; | |
384 | ||
385 | nvm_setup_sysblk_scan(dev, &s, sysblk_ppas); | |
386 | ||
387 | mutex_lock(&dev->mlock); | |
388 | ret = nvm_get_all_sysblks(dev, &s, sysblk_ppas, sysblk_get_host_blks); | |
389 | if (ret) | |
390 | goto err_sysblk; | |
391 | ||
392 | /* no sysblocks initialized */ | |
393 | if (!s.nr_ppas) | |
394 | goto err_sysblk; | |
395 | ||
396 | cur = kzalloc(sizeof(struct nvm_system_block), GFP_KERNEL); | |
397 | if (!cur) | |
398 | goto err_sysblk; | |
399 | ||
400 | /* find the latest block across all sysblocks */ | |
401 | for (i = 0; i < s.nr_rows; i++) { | |
402 | for (j = 0; j < MAX_BLKS_PR_SYSBLK; j++) { | |
403 | struct ppa_addr ppa = s.ppas[scan_ppa_idx(i, j)]; | |
404 | ||
405 | ret = nvm_scan_block(dev, &ppa, cur); | |
406 | if (ret > 0) | |
407 | found = 1; | |
408 | else if (ret < 0) | |
409 | break; | |
410 | } | |
411 | } | |
412 | ||
413 | nvm_sysblk_to_cpu(info, cur); | |
414 | ||
415 | kfree(cur); | |
416 | err_sysblk: | |
417 | mutex_unlock(&dev->mlock); | |
418 | ||
419 | if (found) | |
420 | return 1; | |
421 | return ret; | |
422 | } | |
423 | ||
424 | int nvm_update_sysblock(struct nvm_dev *dev, struct nvm_sb_info *new) | |
425 | { | |
426 | /* 1. for each latest superblock | |
427 | * 2. if room | |
428 | * a. write new flash page entry with the updated information | |
429 | * 3. if no room | |
430 | * a. find next available block on lun (linear search) | |
431 | * if none, continue to next lun | |
432 | * if none at all, report error. also report that it wasn't | |
433 | * possible to write to all superblocks. | |
434 | * c. write data to block. | |
435 | */ | |
436 | struct ppa_addr sysblk_ppas[MAX_SYSBLKS]; | |
437 | struct sysblk_scan s; | |
438 | struct nvm_system_block *cur; | |
439 | int i, j, ppaidx, found = 0; | |
440 | int ret = -ENOMEM; | |
441 | ||
442 | if (!dev->ops->get_bb_tbl) | |
443 | return -EINVAL; | |
444 | ||
445 | nvm_setup_sysblk_scan(dev, &s, sysblk_ppas); | |
446 | ||
447 | mutex_lock(&dev->mlock); | |
448 | ret = nvm_get_all_sysblks(dev, &s, sysblk_ppas, sysblk_get_host_blks); | |
449 | if (ret) | |
450 | goto err_sysblk; | |
451 | ||
452 | cur = kzalloc(sizeof(struct nvm_system_block), GFP_KERNEL); | |
453 | if (!cur) | |
454 | goto err_sysblk; | |
455 | ||
456 | /* Get the latest sysblk for each sysblk row */ | |
457 | for (i = 0; i < s.nr_rows; i++) { | |
458 | found = 0; | |
459 | for (j = 0; j < MAX_BLKS_PR_SYSBLK; j++) { | |
460 | ppaidx = scan_ppa_idx(i, j); | |
461 | ret = nvm_scan_block(dev, &s.ppas[ppaidx], cur); | |
462 | if (ret > 0) { | |
463 | s.act_blk[i] = j; | |
464 | found = 1; | |
465 | } else if (ret < 0) | |
466 | break; | |
467 | } | |
468 | } | |
469 | ||
470 | if (!found) { | |
471 | pr_err("nvm: no valid sysblks found to update\n"); | |
472 | ret = -EINVAL; | |
473 | goto err_cur; | |
474 | } | |
475 | ||
476 | /* | |
477 | * All sysblocks found. Check that they have same page id in their flash | |
478 | * blocks | |
479 | */ | |
480 | for (i = 1; i < s.nr_rows; i++) { | |
481 | struct ppa_addr l = s.ppas[scan_ppa_idx(0, s.act_blk[0])]; | |
482 | struct ppa_addr r = s.ppas[scan_ppa_idx(i, s.act_blk[i])]; | |
483 | ||
484 | if (l.g.pg != r.g.pg) { | |
485 | pr_err("nvm: sysblks not on same page. Previous update failed.\n"); | |
486 | ret = -EINVAL; | |
487 | goto err_cur; | |
488 | } | |
489 | } | |
490 | ||
491 | /* | |
492 | * Check that there haven't been another update to the seqnr since we | |
493 | * began | |
494 | */ | |
495 | if ((new->seqnr - 1) != be32_to_cpu(cur->seqnr)) { | |
496 | pr_err("nvm: seq is not sequential\n"); | |
497 | ret = -EINVAL; | |
498 | goto err_cur; | |
499 | } | |
500 | ||
501 | /* | |
502 | * When all pages in a block has been written, a new block is selected | |
503 | * and writing is performed on the new block. | |
504 | */ | |
505 | if (s.ppas[scan_ppa_idx(0, s.act_blk[0])].g.pg == | |
506 | dev->lps_per_blk - 1) { | |
507 | ret = nvm_prepare_new_sysblks(dev, &s); | |
508 | if (ret) | |
509 | goto err_cur; | |
510 | } | |
511 | ||
512 | ret = nvm_write_and_verify(dev, new, &s); | |
513 | err_cur: | |
514 | kfree(cur); | |
515 | err_sysblk: | |
516 | mutex_unlock(&dev->mlock); | |
517 | ||
518 | return ret; | |
519 | } | |
520 | ||
521 | int nvm_init_sysblock(struct nvm_dev *dev, struct nvm_sb_info *info) | |
522 | { | |
523 | struct ppa_addr sysblk_ppas[MAX_SYSBLKS]; | |
524 | struct sysblk_scan s; | |
525 | int ret; | |
526 | ||
527 | /* | |
528 | * 1. select master blocks and select first available blks | |
529 | * 2. get bad block list | |
530 | * 3. mark MAX_SYSBLKS block as host-based device allocated. | |
531 | * 4. write and verify data to block | |
532 | */ | |
533 | ||
534 | if (!dev->ops->get_bb_tbl || !dev->ops->set_bb_tbl) | |
535 | return -EINVAL; | |
536 | ||
537 | if (!(dev->mccap & NVM_ID_CAP_SLC) || !dev->lps_per_blk) { | |
538 | pr_err("nvm: memory does not support SLC access\n"); | |
539 | return -EINVAL; | |
540 | } | |
541 | ||
542 | /* Index all sysblocks and mark them as host-driven */ | |
543 | nvm_setup_sysblk_scan(dev, &s, sysblk_ppas); | |
544 | ||
545 | mutex_lock(&dev->mlock); | |
546 | ret = nvm_get_all_sysblks(dev, &s, sysblk_ppas, sysblk_get_free_blks); | |
547 | if (ret) | |
548 | goto err_mark; | |
549 | ||
550 | ret = nvm_set_bb_tbl(dev, &s, NVM_BLK_T_HOST); | |
551 | if (ret) | |
552 | goto err_mark; | |
553 | ||
554 | /* Write to the first block of each row */ | |
555 | ret = nvm_write_and_verify(dev, info, &s); | |
556 | err_mark: | |
557 | mutex_unlock(&dev->mlock); | |
558 | return ret; | |
559 | } | |
8b4970c4 MB |
560 | |
561 | struct factory_blks { | |
562 | struct nvm_dev *dev; | |
563 | int flags; | |
564 | unsigned long *blks; | |
565 | }; | |
566 | ||
567 | static int factory_nblks(int nblks) | |
568 | { | |
569 | /* Round up to nearest BITS_PER_LONG */ | |
570 | return (nblks + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); | |
571 | } | |
572 | ||
573 | static unsigned int factory_blk_offset(struct nvm_dev *dev, int ch, int lun) | |
574 | { | |
575 | int nblks = factory_nblks(dev->blks_per_lun); | |
576 | ||
577 | return ((ch * dev->luns_per_chnl * nblks) + (lun * nblks)) / | |
578 | BITS_PER_LONG; | |
579 | } | |
580 | ||
581 | static int nvm_factory_blks(struct ppa_addr ppa, int nr_blks, u8 *blks, | |
582 | void *private) | |
583 | { | |
584 | struct factory_blks *f = private; | |
585 | struct nvm_dev *dev = f->dev; | |
586 | int i, lunoff; | |
587 | ||
588 | lunoff = factory_blk_offset(dev, ppa.g.ch, ppa.g.lun); | |
589 | ||
590 | /* non-set bits correspond to the block must be erased */ | |
591 | for (i = 0; i < nr_blks; i++) { | |
592 | switch (blks[i]) { | |
593 | case NVM_BLK_T_FREE: | |
594 | if (f->flags & NVM_FACTORY_ERASE_ONLY_USER) | |
595 | set_bit(i, &f->blks[lunoff]); | |
596 | break; | |
597 | case NVM_BLK_T_HOST: | |
598 | if (!(f->flags & NVM_FACTORY_RESET_HOST_BLKS)) | |
599 | set_bit(i, &f->blks[lunoff]); | |
600 | break; | |
601 | case NVM_BLK_T_GRWN_BAD: | |
602 | if (!(f->flags & NVM_FACTORY_RESET_GRWN_BBLKS)) | |
603 | set_bit(i, &f->blks[lunoff]); | |
604 | break; | |
605 | default: | |
606 | set_bit(i, &f->blks[lunoff]); | |
607 | break; | |
608 | } | |
609 | } | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | static int nvm_fact_get_blks(struct nvm_dev *dev, struct ppa_addr *erase_list, | |
615 | int max_ppas, struct factory_blks *f) | |
616 | { | |
617 | struct ppa_addr ppa; | |
618 | int ch, lun, blkid, idx, done = 0, ppa_cnt = 0; | |
619 | unsigned long *offset; | |
620 | ||
621 | while (!done) { | |
622 | done = 1; | |
623 | for (ch = 0; ch < dev->nr_chnls; ch++) { | |
624 | for (lun = 0; lun < dev->luns_per_chnl; lun++) { | |
625 | idx = factory_blk_offset(dev, ch, lun); | |
626 | offset = &f->blks[idx]; | |
627 | ||
628 | blkid = find_first_zero_bit(offset, | |
629 | dev->blks_per_lun); | |
630 | if (blkid >= dev->blks_per_lun) | |
631 | continue; | |
632 | set_bit(blkid, offset); | |
633 | ||
634 | ppa.ppa = 0; | |
635 | ppa.g.ch = ch; | |
636 | ppa.g.lun = lun; | |
637 | ppa.g.blk = blkid; | |
638 | pr_debug("nvm: erase ppa (%u %u %u)\n", | |
639 | ppa.g.ch, | |
640 | ppa.g.lun, | |
641 | ppa.g.blk); | |
642 | ||
643 | erase_list[ppa_cnt] = ppa; | |
644 | ppa_cnt++; | |
645 | done = 0; | |
646 | ||
647 | if (ppa_cnt == max_ppas) | |
648 | return ppa_cnt; | |
649 | } | |
650 | } | |
651 | } | |
652 | ||
653 | return ppa_cnt; | |
654 | } | |
655 | ||
656 | static int nvm_fact_get_bb_tbl(struct nvm_dev *dev, struct ppa_addr ppa, | |
657 | nvm_bb_update_fn *fn, void *priv) | |
658 | { | |
659 | struct ppa_addr dev_ppa; | |
660 | int ret; | |
661 | ||
662 | dev_ppa = generic_to_dev_addr(dev, ppa); | |
663 | ||
664 | ret = dev->ops->get_bb_tbl(dev, dev_ppa, dev->blks_per_lun, fn, priv); | |
665 | if (ret) | |
666 | pr_err("nvm: failed bb tbl for ch%u lun%u\n", | |
667 | ppa.g.ch, ppa.g.blk); | |
668 | return ret; | |
669 | } | |
670 | ||
671 | static int nvm_fact_select_blks(struct nvm_dev *dev, struct factory_blks *f) | |
672 | { | |
673 | int ch, lun, ret; | |
674 | struct ppa_addr ppa; | |
675 | ||
676 | ppa.ppa = 0; | |
677 | for (ch = 0; ch < dev->nr_chnls; ch++) { | |
678 | for (lun = 0; lun < dev->luns_per_chnl; lun++) { | |
679 | ppa.g.ch = ch; | |
680 | ppa.g.lun = lun; | |
681 | ||
682 | ret = nvm_fact_get_bb_tbl(dev, ppa, nvm_factory_blks, | |
683 | f); | |
684 | if (ret) | |
685 | return ret; | |
686 | } | |
687 | } | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | int nvm_dev_factory(struct nvm_dev *dev, int flags) | |
693 | { | |
694 | struct factory_blks f; | |
695 | struct ppa_addr *ppas; | |
696 | int ppa_cnt, ret = -ENOMEM; | |
697 | int max_ppas = dev->ops->max_phys_sect / dev->nr_planes; | |
698 | struct ppa_addr sysblk_ppas[MAX_SYSBLKS]; | |
699 | struct sysblk_scan s; | |
700 | ||
701 | f.blks = kzalloc(factory_nblks(dev->blks_per_lun) * dev->nr_luns, | |
702 | GFP_KERNEL); | |
703 | if (!f.blks) | |
704 | return ret; | |
705 | ||
706 | ppas = kcalloc(max_ppas, sizeof(struct ppa_addr), GFP_KERNEL); | |
707 | if (!ppas) | |
708 | goto err_blks; | |
709 | ||
710 | f.dev = dev; | |
711 | f.flags = flags; | |
712 | ||
713 | /* create list of blks to be erased */ | |
714 | ret = nvm_fact_select_blks(dev, &f); | |
715 | if (ret) | |
716 | goto err_ppas; | |
717 | ||
718 | /* continue to erase until list of blks until empty */ | |
719 | while ((ppa_cnt = nvm_fact_get_blks(dev, ppas, max_ppas, &f)) > 0) | |
720 | nvm_erase_ppa(dev, ppas, ppa_cnt); | |
721 | ||
722 | /* mark host reserved blocks free */ | |
723 | if (flags & NVM_FACTORY_RESET_HOST_BLKS) { | |
724 | nvm_setup_sysblk_scan(dev, &s, sysblk_ppas); | |
725 | mutex_lock(&dev->mlock); | |
726 | ret = nvm_get_all_sysblks(dev, &s, sysblk_ppas, | |
727 | sysblk_get_host_blks); | |
728 | if (!ret) | |
729 | ret = nvm_set_bb_tbl(dev, &s, NVM_BLK_T_FREE); | |
730 | mutex_unlock(&dev->mlock); | |
731 | } | |
732 | err_ppas: | |
733 | kfree(ppas); | |
734 | err_blks: | |
735 | kfree(f.blks); | |
736 | return ret; | |
737 | } | |
738 | EXPORT_SYMBOL(nvm_dev_factory); |