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1 | /* |
2 | * Copyright (C) 2015 Matias Bjorling <m@bjorling.me> | |
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 | * Implementation of a generic nvm manager for Open-Channel SSDs. | |
19 | */ | |
20 | ||
21 | #include "gennvm.h" | |
22 | ||
23 | static void gennvm_blocks_free(struct nvm_dev *dev) | |
24 | { | |
25 | struct gen_nvm *gn = dev->mp; | |
26 | struct gen_lun *lun; | |
27 | int i; | |
28 | ||
29 | gennvm_for_each_lun(gn, lun, i) { | |
30 | if (!lun->vlun.blocks) | |
31 | break; | |
32 | vfree(lun->vlun.blocks); | |
33 | } | |
34 | } | |
35 | ||
36 | static void gennvm_luns_free(struct nvm_dev *dev) | |
37 | { | |
38 | struct gen_nvm *gn = dev->mp; | |
39 | ||
40 | kfree(gn->luns); | |
41 | } | |
42 | ||
43 | static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn) | |
44 | { | |
45 | struct gen_lun *lun; | |
46 | int i; | |
47 | ||
48 | gn->luns = kcalloc(dev->nr_luns, sizeof(struct gen_lun), GFP_KERNEL); | |
49 | if (!gn->luns) | |
50 | return -ENOMEM; | |
51 | ||
52 | gennvm_for_each_lun(gn, lun, i) { | |
53 | spin_lock_init(&lun->vlun.lock); | |
54 | INIT_LIST_HEAD(&lun->free_list); | |
55 | INIT_LIST_HEAD(&lun->used_list); | |
56 | INIT_LIST_HEAD(&lun->bb_list); | |
57 | ||
58 | lun->reserved_blocks = 2; /* for GC only */ | |
59 | lun->vlun.id = i; | |
60 | lun->vlun.lun_id = i % dev->luns_per_chnl; | |
61 | lun->vlun.chnl_id = i / dev->luns_per_chnl; | |
62 | lun->vlun.nr_free_blocks = dev->blks_per_lun; | |
0b59733b JG |
63 | lun->vlun.nr_inuse_blocks = 0; |
64 | lun->vlun.nr_bad_blocks = 0; | |
48add0f5 MB |
65 | } |
66 | return 0; | |
67 | } | |
68 | ||
11450469 | 69 | static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks, |
48add0f5 MB |
70 | void *private) |
71 | { | |
72 | struct gen_nvm *gn = private; | |
11450469 MB |
73 | struct nvm_dev *dev = gn->dev; |
74 | struct gen_lun *lun; | |
48add0f5 MB |
75 | struct nvm_block *blk; |
76 | int i; | |
77 | ||
c3293a9a | 78 | lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun]; |
11450469 MB |
79 | |
80 | for (i = 0; i < nr_blocks; i++) { | |
81 | if (blks[i] == 0) | |
82 | continue; | |
48add0f5 | 83 | |
48add0f5 MB |
84 | blk = &lun->vlun.blocks[i]; |
85 | if (!blk) { | |
86 | pr_err("gennvm: BB data is out of bounds.\n"); | |
87 | return -EINVAL; | |
88 | } | |
89 | ||
90 | list_move_tail(&blk->list, &lun->bb_list); | |
0b59733b | 91 | lun->vlun.nr_bad_blocks++; |
bdded155 | 92 | lun->vlun.nr_free_blocks--; |
48add0f5 MB |
93 | } |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private) | |
99 | { | |
100 | struct nvm_dev *dev = private; | |
101 | struct gen_nvm *gn = dev->mp; | |
102 | sector_t max_pages = dev->total_pages * (dev->sec_size >> 9); | |
103 | u64 elba = slba + nlb; | |
104 | struct gen_lun *lun; | |
105 | struct nvm_block *blk; | |
106 | u64 i; | |
107 | int lun_id; | |
108 | ||
109 | if (unlikely(elba > dev->total_pages)) { | |
110 | pr_err("gennvm: L2P data from device is out of bounds!\n"); | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | for (i = 0; i < nlb; i++) { | |
115 | u64 pba = le64_to_cpu(entries[i]); | |
116 | ||
117 | if (unlikely(pba >= max_pages && pba != U64_MAX)) { | |
118 | pr_err("gennvm: L2P data entry is out of bounds!\n"); | |
119 | return -EINVAL; | |
120 | } | |
121 | ||
122 | /* Address zero is a special one. The first page on a disk is | |
123 | * protected. It often holds internal device boot | |
124 | * information. | |
125 | */ | |
126 | if (!pba) | |
127 | continue; | |
128 | ||
129 | /* resolve block from physical address */ | |
130 | lun_id = div_u64(pba, dev->sec_per_lun); | |
131 | lun = &gn->luns[lun_id]; | |
132 | ||
133 | /* Calculate block offset into lun */ | |
134 | pba = pba - (dev->sec_per_lun * lun_id); | |
135 | blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)]; | |
136 | ||
137 | if (!blk->type) { | |
138 | /* at this point, we don't know anything about the | |
139 | * block. It's up to the FTL on top to re-etablish the | |
140 | * block state | |
141 | */ | |
142 | list_move_tail(&blk->list, &lun->used_list); | |
143 | blk->type = 1; | |
144 | lun->vlun.nr_free_blocks--; | |
0b59733b | 145 | lun->vlun.nr_inuse_blocks++; |
48add0f5 MB |
146 | } |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn) | |
153 | { | |
154 | struct gen_lun *lun; | |
155 | struct nvm_block *block; | |
156 | sector_t lun_iter, blk_iter, cur_block_id = 0; | |
157 | int ret; | |
158 | ||
159 | gennvm_for_each_lun(gn, lun, lun_iter) { | |
160 | lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) * | |
161 | dev->blks_per_lun); | |
162 | if (!lun->vlun.blocks) | |
163 | return -ENOMEM; | |
164 | ||
165 | for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) { | |
166 | block = &lun->vlun.blocks[blk_iter]; | |
167 | ||
168 | INIT_LIST_HEAD(&block->list); | |
169 | ||
170 | block->lun = &lun->vlun; | |
171 | block->id = cur_block_id++; | |
172 | ||
173 | /* First block is reserved for device */ | |
0b59733b JG |
174 | if (unlikely(lun_iter == 0 && blk_iter == 0)) { |
175 | lun->vlun.nr_free_blocks--; | |
48add0f5 | 176 | continue; |
0b59733b | 177 | } |
48add0f5 MB |
178 | |
179 | list_add_tail(&block->list, &lun->free_list); | |
180 | } | |
181 | ||
182 | if (dev->ops->get_bb_tbl) { | |
11450469 MB |
183 | struct ppa_addr ppa; |
184 | ||
185 | ppa.ppa = 0; | |
186 | ppa.g.ch = lun->vlun.chnl_id; | |
187 | ppa.g.lun = lun->vlun.id; | |
7386af27 | 188 | ppa = generic_to_dev_addr(dev, ppa); |
11450469 | 189 | |
08236c6b | 190 | ret = dev->ops->get_bb_tbl(dev, ppa, |
11450469 MB |
191 | dev->blks_per_lun, |
192 | gennvm_block_bb, gn); | |
48add0f5 MB |
193 | if (ret) |
194 | pr_err("gennvm: could not read BB table\n"); | |
195 | } | |
196 | } | |
197 | ||
198 | if (dev->ops->get_l2p_tbl) { | |
16f26c3a | 199 | ret = dev->ops->get_l2p_tbl(dev, 0, dev->total_pages, |
48add0f5 MB |
200 | gennvm_block_map, dev); |
201 | if (ret) { | |
202 | pr_err("gennvm: could not read L2P table.\n"); | |
203 | pr_warn("gennvm: default block initialization"); | |
204 | } | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
8261bd48 WT |
210 | static void gennvm_free(struct nvm_dev *dev) |
211 | { | |
212 | gennvm_blocks_free(dev); | |
213 | gennvm_luns_free(dev); | |
214 | kfree(dev->mp); | |
215 | dev->mp = NULL; | |
216 | } | |
217 | ||
48add0f5 MB |
218 | static int gennvm_register(struct nvm_dev *dev) |
219 | { | |
220 | struct gen_nvm *gn; | |
221 | int ret; | |
222 | ||
008b7443 MB |
223 | if (!try_module_get(THIS_MODULE)) |
224 | return -ENODEV; | |
225 | ||
48add0f5 MB |
226 | gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL); |
227 | if (!gn) | |
228 | return -ENOMEM; | |
229 | ||
11450469 | 230 | gn->dev = dev; |
48add0f5 MB |
231 | gn->nr_luns = dev->nr_luns; |
232 | dev->mp = gn; | |
233 | ||
234 | ret = gennvm_luns_init(dev, gn); | |
235 | if (ret) { | |
236 | pr_err("gennvm: could not initialize luns\n"); | |
237 | goto err; | |
238 | } | |
239 | ||
240 | ret = gennvm_blocks_init(dev, gn); | |
241 | if (ret) { | |
242 | pr_err("gennvm: could not initialize blocks\n"); | |
243 | goto err; | |
244 | } | |
245 | ||
246 | return 1; | |
247 | err: | |
8261bd48 | 248 | gennvm_free(dev); |
008b7443 | 249 | module_put(THIS_MODULE); |
48add0f5 MB |
250 | return ret; |
251 | } | |
252 | ||
253 | static void gennvm_unregister(struct nvm_dev *dev) | |
254 | { | |
8261bd48 | 255 | gennvm_free(dev); |
008b7443 | 256 | module_put(THIS_MODULE); |
48add0f5 MB |
257 | } |
258 | ||
259 | static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev, | |
260 | struct nvm_lun *vlun, unsigned long flags) | |
261 | { | |
262 | struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun); | |
263 | struct nvm_block *blk = NULL; | |
264 | int is_gc = flags & NVM_IOTYPE_GC; | |
265 | ||
266 | spin_lock(&vlun->lock); | |
267 | ||
268 | if (list_empty(&lun->free_list)) { | |
269 | pr_err_ratelimited("gennvm: lun %u have no free pages available", | |
270 | lun->vlun.id); | |
48add0f5 MB |
271 | goto out; |
272 | } | |
273 | ||
e9b76a80 | 274 | if (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks) |
48add0f5 | 275 | goto out; |
48add0f5 MB |
276 | |
277 | blk = list_first_entry(&lun->free_list, struct nvm_block, list); | |
278 | list_move_tail(&blk->list, &lun->used_list); | |
279 | blk->type = 1; | |
280 | ||
281 | lun->vlun.nr_free_blocks--; | |
0b59733b | 282 | lun->vlun.nr_inuse_blocks++; |
48add0f5 | 283 | |
48add0f5 | 284 | out: |
e9b76a80 | 285 | spin_unlock(&vlun->lock); |
48add0f5 MB |
286 | return blk; |
287 | } | |
288 | ||
289 | static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
290 | { | |
291 | struct nvm_lun *vlun = blk->lun; | |
292 | struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun); | |
293 | ||
294 | spin_lock(&vlun->lock); | |
295 | ||
296 | switch (blk->type) { | |
297 | case 1: | |
298 | list_move_tail(&blk->list, &lun->free_list); | |
299 | lun->vlun.nr_free_blocks++; | |
0b59733b | 300 | lun->vlun.nr_inuse_blocks--; |
48add0f5 MB |
301 | blk->type = 0; |
302 | break; | |
303 | case 2: | |
304 | list_move_tail(&blk->list, &lun->bb_list); | |
0b59733b JG |
305 | lun->vlun.nr_bad_blocks++; |
306 | lun->vlun.nr_inuse_blocks--; | |
48add0f5 MB |
307 | break; |
308 | default: | |
309 | WARN_ON_ONCE(1); | |
310 | pr_err("gennvm: erroneous block type (%lu -> %u)\n", | |
311 | blk->id, blk->type); | |
312 | list_move_tail(&blk->list, &lun->bb_list); | |
0b59733b JG |
313 | lun->vlun.nr_bad_blocks++; |
314 | lun->vlun.nr_inuse_blocks--; | |
48add0f5 MB |
315 | } |
316 | ||
317 | spin_unlock(&vlun->lock); | |
318 | } | |
319 | ||
48add0f5 MB |
320 | static void gennvm_blk_set_type(struct nvm_dev *dev, struct ppa_addr *ppa, |
321 | int type) | |
322 | { | |
323 | struct gen_nvm *gn = dev->mp; | |
324 | struct gen_lun *lun; | |
325 | struct nvm_block *blk; | |
326 | ||
327 | if (unlikely(ppa->g.ch > dev->nr_chnls || | |
328 | ppa->g.lun > dev->luns_per_chnl || | |
329 | ppa->g.blk > dev->blks_per_lun)) { | |
330 | WARN_ON_ONCE(1); | |
331 | pr_err("gennvm: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u", | |
332 | ppa->g.ch, dev->nr_chnls, | |
333 | ppa->g.lun, dev->luns_per_chnl, | |
334 | ppa->g.blk, dev->blks_per_lun); | |
335 | return; | |
336 | } | |
337 | ||
338 | lun = &gn->luns[ppa->g.lun * ppa->g.ch]; | |
339 | blk = &lun->vlun.blocks[ppa->g.blk]; | |
340 | ||
341 | /* will be moved to bb list on put_blk from target */ | |
342 | blk->type = type; | |
343 | } | |
344 | ||
345 | /* mark block bad. It is expected the target recover from the error. */ | |
346 | static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd) | |
347 | { | |
348 | int i; | |
349 | ||
11450469 | 350 | if (!dev->ops->set_bb_tbl) |
48add0f5 MB |
351 | return; |
352 | ||
16f26c3a | 353 | if (dev->ops->set_bb_tbl(dev, rqd, 1)) |
48add0f5 MB |
354 | return; |
355 | ||
069368e9 | 356 | nvm_addr_to_generic_mode(dev, rqd); |
48add0f5 MB |
357 | |
358 | /* look up blocks and mark them as bad */ | |
359 | if (rqd->nr_pages > 1) | |
360 | for (i = 0; i < rqd->nr_pages; i++) | |
361 | gennvm_blk_set_type(dev, &rqd->ppa_list[i], 2); | |
362 | else | |
363 | gennvm_blk_set_type(dev, &rqd->ppa_addr, 2); | |
364 | } | |
365 | ||
91276162 | 366 | static void gennvm_end_io(struct nvm_rq *rqd, int error) |
48add0f5 MB |
367 | { |
368 | struct nvm_tgt_instance *ins = rqd->ins; | |
48add0f5 MB |
369 | |
370 | switch (error) { | |
371 | case NVM_RSP_SUCCESS: | |
48add0f5 MB |
372 | case NVM_RSP_ERR_EMPTYPAGE: |
373 | break; | |
374 | case NVM_RSP_ERR_FAILWRITE: | |
375 | gennvm_mark_blk_bad(rqd->dev, rqd); | |
48add0f5 MB |
376 | } |
377 | ||
91276162 MB |
378 | ins->tt->end_io(rqd, error); |
379 | } | |
48add0f5 | 380 | |
91276162 MB |
381 | static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) |
382 | { | |
383 | if (!dev->ops->submit_io) | |
384 | return -ENODEV; | |
385 | ||
386 | /* Convert address space */ | |
387 | nvm_generic_to_addr_mode(dev, rqd); | |
388 | ||
389 | rqd->dev = dev; | |
390 | rqd->end_io = gennvm_end_io; | |
391 | return dev->ops->submit_io(dev, rqd); | |
48add0f5 MB |
392 | } |
393 | ||
394 | static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, | |
395 | unsigned long flags) | |
396 | { | |
069368e9 | 397 | struct ppa_addr addr = block_to_ppa(dev, blk); |
48add0f5 | 398 | |
81e681d3 | 399 | return nvm_erase_ppa(dev, &addr, 1); |
48add0f5 MB |
400 | } |
401 | ||
402 | static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid) | |
403 | { | |
404 | struct gen_nvm *gn = dev->mp; | |
405 | ||
406 | return &gn->luns[lunid].vlun; | |
407 | } | |
408 | ||
2fde0e48 | 409 | static void gennvm_lun_info_print(struct nvm_dev *dev) |
48add0f5 MB |
410 | { |
411 | struct gen_nvm *gn = dev->mp; | |
412 | struct gen_lun *lun; | |
413 | unsigned int i; | |
414 | ||
2fde0e48 JG |
415 | |
416 | gennvm_for_each_lun(gn, lun, i) { | |
417 | spin_lock(&lun->vlun.lock); | |
418 | ||
419 | pr_info("%s: lun%8u\t%u\t%u\t%u\n", | |
420 | dev->name, i, | |
421 | lun->vlun.nr_free_blocks, | |
422 | lun->vlun.nr_inuse_blocks, | |
423 | lun->vlun.nr_bad_blocks); | |
424 | ||
425 | spin_unlock(&lun->vlun.lock); | |
426 | } | |
48add0f5 MB |
427 | } |
428 | ||
429 | static struct nvmm_type gennvm = { | |
430 | .name = "gennvm", | |
431 | .version = {0, 1, 0}, | |
432 | ||
433 | .register_mgr = gennvm_register, | |
434 | .unregister_mgr = gennvm_unregister, | |
435 | ||
436 | .get_blk = gennvm_get_blk, | |
437 | .put_blk = gennvm_put_blk, | |
438 | ||
439 | .submit_io = gennvm_submit_io, | |
48add0f5 MB |
440 | .erase_blk = gennvm_erase_blk, |
441 | ||
442 | .get_lun = gennvm_get_lun, | |
2fde0e48 | 443 | .lun_info_print = gennvm_lun_info_print, |
48add0f5 MB |
444 | }; |
445 | ||
446 | static int __init gennvm_module_init(void) | |
447 | { | |
448 | return nvm_register_mgr(&gennvm); | |
449 | } | |
450 | ||
451 | static void gennvm_module_exit(void) | |
452 | { | |
453 | nvm_unregister_mgr(&gennvm); | |
454 | } | |
455 | ||
456 | module_init(gennvm_module_init); | |
457 | module_exit(gennvm_module_exit); | |
458 | MODULE_LICENSE("GPL v2"); | |
459 | MODULE_DESCRIPTION("Generic media manager for Open-Channel SSDs"); |