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48add0f5 MB |
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 | * | |
5e60edb7 | 18 | * Implementation of a general nvm manager for Open-Channel SSDs. |
48add0f5 MB |
19 | */ |
20 | ||
21 | #include "gennvm.h" | |
22 | ||
b76eb20b MB |
23 | static struct nvm_target *gen_find_target(struct gen_dev *gn, const char *name) |
24 | { | |
25 | struct nvm_target *tgt; | |
26 | ||
27 | list_for_each_entry(tgt, &gn->targets, list) | |
28 | if (!strcmp(name, tgt->disk->disk_name)) | |
29 | return tgt; | |
30 | ||
31 | return NULL; | |
32 | } | |
33 | ||
34 | static const struct block_device_operations gen_fops = { | |
35 | .owner = THIS_MODULE, | |
36 | }; | |
37 | ||
8176117b JG |
38 | static int gen_reserve_luns(struct nvm_dev *dev, struct nvm_target *t, |
39 | int lun_begin, int lun_end) | |
40 | { | |
8176117b JG |
41 | int i; |
42 | ||
43 | for (i = lun_begin; i <= lun_end; i++) { | |
44 | if (test_and_set_bit(i, dev->lun_map)) { | |
45 | pr_err("nvm: lun %d already allocated\n", i); | |
46 | goto err; | |
47 | } | |
8176117b JG |
48 | } |
49 | ||
50 | return 0; | |
51 | ||
52 | err: | |
8e53624d | 53 | while (--i > lun_begin) |
8176117b | 54 | clear_bit(i, dev->lun_map); |
8176117b JG |
55 | |
56 | return -EBUSY; | |
57 | } | |
58 | ||
8e53624d JG |
59 | static void gen_release_luns_err(struct nvm_dev *dev, int lun_begin, |
60 | int lun_end) | |
8176117b | 61 | { |
8e53624d | 62 | int i; |
8176117b | 63 | |
8e53624d JG |
64 | for (i = lun_begin; i <= lun_end; i++) |
65 | WARN_ON(!test_and_clear_bit(i, dev->lun_map)); | |
8176117b JG |
66 | } |
67 | ||
8e79b5cb JG |
68 | static void gen_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev) |
69 | { | |
8e53624d JG |
70 | struct nvm_dev *dev = tgt_dev->parent; |
71 | struct gen_dev_map *dev_map = tgt_dev->map; | |
72 | int i, j; | |
73 | ||
74 | for (i = 0; i < dev_map->nr_chnls; i++) { | |
75 | struct gen_ch_map *ch_map = &dev_map->chnls[i]; | |
76 | int *lun_offs = ch_map->lun_offs; | |
77 | int ch = i + ch_map->ch_off; | |
78 | ||
79 | for (j = 0; j < ch_map->nr_luns; j++) { | |
80 | int lun = j + lun_offs[j]; | |
81 | int lunid = (ch * dev->geo.luns_per_chnl) + lun; | |
82 | ||
83 | WARN_ON(!test_and_clear_bit(lunid, dev->lun_map)); | |
84 | } | |
85 | ||
86 | kfree(ch_map->lun_offs); | |
87 | } | |
88 | ||
89 | kfree(dev_map->chnls); | |
90 | kfree(dev_map); | |
91 | kfree(tgt_dev->luns); | |
8e79b5cb JG |
92 | kfree(tgt_dev); |
93 | } | |
94 | ||
95 | static struct nvm_tgt_dev *gen_create_tgt_dev(struct nvm_dev *dev, | |
96 | int lun_begin, int lun_end) | |
97 | { | |
98 | struct nvm_tgt_dev *tgt_dev = NULL; | |
8e53624d JG |
99 | struct gen_dev_map *dev_rmap = dev->rmap; |
100 | struct gen_dev_map *dev_map; | |
101 | struct ppa_addr *luns; | |
8e79b5cb | 102 | int nr_luns = lun_end - lun_begin + 1; |
8e53624d JG |
103 | int luns_left = nr_luns; |
104 | int nr_chnls = nr_luns / dev->geo.luns_per_chnl; | |
105 | int nr_chnls_mod = nr_luns % dev->geo.luns_per_chnl; | |
106 | int bch = lun_begin / dev->geo.luns_per_chnl; | |
107 | int blun = lun_begin % dev->geo.luns_per_chnl; | |
108 | int lunid = 0; | |
109 | int lun_balanced = 1; | |
110 | int prev_nr_luns; | |
111 | int i, j; | |
112 | ||
113 | nr_chnls = nr_luns / dev->geo.luns_per_chnl; | |
114 | nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1; | |
115 | ||
116 | dev_map = kmalloc(sizeof(struct gen_dev_map), GFP_KERNEL); | |
117 | if (!dev_map) | |
118 | goto err_dev; | |
119 | ||
120 | dev_map->chnls = kcalloc(nr_chnls, sizeof(struct gen_ch_map), | |
121 | GFP_KERNEL); | |
122 | if (!dev_map->chnls) | |
123 | goto err_chnls; | |
124 | ||
125 | luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL); | |
126 | if (!luns) | |
127 | goto err_luns; | |
128 | ||
129 | prev_nr_luns = (luns_left > dev->geo.luns_per_chnl) ? | |
130 | dev->geo.luns_per_chnl : luns_left; | |
131 | for (i = 0; i < nr_chnls; i++) { | |
132 | struct gen_ch_map *ch_rmap = &dev_rmap->chnls[i + bch]; | |
133 | int *lun_roffs = ch_rmap->lun_offs; | |
134 | struct gen_ch_map *ch_map = &dev_map->chnls[i]; | |
135 | int *lun_offs; | |
136 | int luns_in_chnl = (luns_left > dev->geo.luns_per_chnl) ? | |
137 | dev->geo.luns_per_chnl : luns_left; | |
138 | ||
139 | if (lun_balanced && prev_nr_luns != luns_in_chnl) | |
140 | lun_balanced = 0; | |
141 | ||
142 | ch_map->ch_off = ch_rmap->ch_off = bch; | |
143 | ch_map->nr_luns = luns_in_chnl; | |
144 | ||
145 | lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); | |
146 | if (!lun_offs) | |
147 | goto err_ch; | |
148 | ||
149 | for (j = 0; j < luns_in_chnl; j++) { | |
150 | luns[lunid].ppa = 0; | |
151 | luns[lunid].g.ch = i; | |
152 | luns[lunid++].g.lun = j; | |
153 | ||
154 | lun_offs[j] = blun; | |
155 | lun_roffs[j + blun] = blun; | |
156 | } | |
157 | ||
158 | ch_map->lun_offs = lun_offs; | |
159 | ||
160 | /* when starting a new channel, lun offset is reset */ | |
161 | blun = 0; | |
162 | luns_left -= luns_in_chnl; | |
163 | } | |
164 | ||
165 | dev_map->nr_chnls = nr_chnls; | |
8e79b5cb JG |
166 | |
167 | tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL); | |
168 | if (!tgt_dev) | |
8e53624d | 169 | goto err_ch; |
8e79b5cb JG |
170 | |
171 | memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo)); | |
8e53624d JG |
172 | /* Target device only owns a portion of the physical device */ |
173 | tgt_dev->geo.nr_chnls = nr_chnls; | |
8e79b5cb | 174 | tgt_dev->geo.nr_luns = nr_luns; |
8e53624d | 175 | tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1; |
8e79b5cb JG |
176 | tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun; |
177 | tgt_dev->q = dev->q; | |
8e53624d JG |
178 | tgt_dev->map = dev_map; |
179 | tgt_dev->luns = luns; | |
8e79b5cb JG |
180 | memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id)); |
181 | ||
182 | tgt_dev->parent = dev; | |
183 | ||
8e53624d JG |
184 | return tgt_dev; |
185 | err_ch: | |
186 | while (--i > 0) | |
187 | kfree(dev_map->chnls[i].lun_offs); | |
188 | kfree(luns); | |
189 | err_luns: | |
190 | kfree(dev_map->chnls); | |
191 | err_chnls: | |
192 | kfree(dev_map); | |
193 | err_dev: | |
8e79b5cb JG |
194 | return tgt_dev; |
195 | } | |
196 | ||
b76eb20b MB |
197 | static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) |
198 | { | |
199 | struct gen_dev *gn = dev->mp; | |
200 | struct nvm_ioctl_create_simple *s = &create->conf.s; | |
201 | struct request_queue *tqueue; | |
202 | struct gendisk *tdisk; | |
203 | struct nvm_tgt_type *tt; | |
204 | struct nvm_target *t; | |
8e79b5cb | 205 | struct nvm_tgt_dev *tgt_dev; |
b76eb20b MB |
206 | void *targetdata; |
207 | ||
208 | tt = nvm_find_target_type(create->tgttype, 1); | |
209 | if (!tt) { | |
210 | pr_err("nvm: target type %s not found\n", create->tgttype); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | mutex_lock(&gn->lock); | |
215 | t = gen_find_target(gn, create->tgtname); | |
216 | if (t) { | |
217 | pr_err("nvm: target name already exists.\n"); | |
218 | mutex_unlock(&gn->lock); | |
219 | return -EINVAL; | |
220 | } | |
221 | mutex_unlock(&gn->lock); | |
222 | ||
223 | t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); | |
224 | if (!t) | |
225 | return -ENOMEM; | |
226 | ||
8176117b JG |
227 | if (gen_reserve_luns(dev, t, s->lun_begin, s->lun_end)) |
228 | goto err_t; | |
229 | ||
8e79b5cb | 230 | tgt_dev = gen_create_tgt_dev(dev, s->lun_begin, s->lun_end); |
8e53624d JG |
231 | if (!tgt_dev) { |
232 | pr_err("nvm: could not create target device\n"); | |
8e79b5cb | 233 | goto err_reserve; |
8e53624d | 234 | } |
8e79b5cb | 235 | |
b76eb20b MB |
236 | tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); |
237 | if (!tqueue) | |
8e79b5cb | 238 | goto err_dev; |
b76eb20b MB |
239 | blk_queue_make_request(tqueue, tt->make_rq); |
240 | ||
241 | tdisk = alloc_disk(0); | |
242 | if (!tdisk) | |
243 | goto err_queue; | |
244 | ||
245 | sprintf(tdisk->disk_name, "%s", create->tgtname); | |
246 | tdisk->flags = GENHD_FL_EXT_DEVT; | |
247 | tdisk->major = 0; | |
248 | tdisk->first_minor = 0; | |
249 | tdisk->fops = &gen_fops; | |
250 | tdisk->queue = tqueue; | |
251 | ||
8e53624d | 252 | targetdata = tt->init(tgt_dev, tdisk); |
b76eb20b MB |
253 | if (IS_ERR(targetdata)) |
254 | goto err_init; | |
255 | ||
256 | tdisk->private_data = targetdata; | |
257 | tqueue->queuedata = targetdata; | |
258 | ||
259 | blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect); | |
260 | ||
261 | set_capacity(tdisk, tt->capacity(targetdata)); | |
262 | add_disk(tdisk); | |
263 | ||
264 | t->type = tt; | |
265 | t->disk = tdisk; | |
8e79b5cb | 266 | t->dev = tgt_dev; |
b76eb20b MB |
267 | |
268 | mutex_lock(&gn->lock); | |
269 | list_add_tail(&t->list, &gn->targets); | |
270 | mutex_unlock(&gn->lock); | |
271 | ||
272 | return 0; | |
273 | err_init: | |
274 | put_disk(tdisk); | |
275 | err_queue: | |
276 | blk_cleanup_queue(tqueue); | |
8e79b5cb JG |
277 | err_dev: |
278 | kfree(tgt_dev); | |
8176117b | 279 | err_reserve: |
8e53624d | 280 | gen_release_luns_err(dev, s->lun_begin, s->lun_end); |
b76eb20b MB |
281 | err_t: |
282 | kfree(t); | |
283 | return -ENOMEM; | |
284 | } | |
285 | ||
286 | static void __gen_remove_target(struct nvm_target *t) | |
287 | { | |
288 | struct nvm_tgt_type *tt = t->type; | |
289 | struct gendisk *tdisk = t->disk; | |
290 | struct request_queue *q = tdisk->queue; | |
291 | ||
292 | del_gendisk(tdisk); | |
293 | blk_cleanup_queue(q); | |
294 | ||
295 | if (tt->exit) | |
296 | tt->exit(tdisk->private_data); | |
297 | ||
8e79b5cb | 298 | gen_remove_tgt_dev(t->dev); |
b76eb20b MB |
299 | put_disk(tdisk); |
300 | ||
301 | list_del(&t->list); | |
302 | kfree(t); | |
303 | } | |
304 | ||
305 | /** | |
306 | * gen_remove_tgt - Removes a target from the media manager | |
307 | * @dev: device | |
308 | * @remove: ioctl structure with target name to remove. | |
309 | * | |
310 | * Returns: | |
311 | * 0: on success | |
312 | * 1: on not found | |
313 | * <0: on error | |
314 | */ | |
315 | static int gen_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove) | |
316 | { | |
317 | struct gen_dev *gn = dev->mp; | |
318 | struct nvm_target *t; | |
319 | ||
320 | if (!gn) | |
321 | return 1; | |
322 | ||
323 | mutex_lock(&gn->lock); | |
324 | t = gen_find_target(gn, remove->tgtname); | |
325 | if (!t) { | |
326 | mutex_unlock(&gn->lock); | |
327 | return 1; | |
328 | } | |
329 | __gen_remove_target(t); | |
330 | mutex_unlock(&gn->lock); | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
5e60edb7 | 335 | static int gen_get_area(struct nvm_dev *dev, sector_t *lba, sector_t len) |
4c9dacb8 | 336 | { |
8e79b5cb | 337 | struct nvm_geo *geo = &dev->geo; |
5e60edb7 MB |
338 | struct gen_dev *gn = dev->mp; |
339 | struct gen_area *area, *prev, *next; | |
4c9dacb8 | 340 | sector_t begin = 0; |
8e79b5cb | 341 | sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9; |
4c9dacb8 WT |
342 | |
343 | if (len > max_sectors) | |
344 | return -EINVAL; | |
345 | ||
5e60edb7 | 346 | area = kmalloc(sizeof(struct gen_area), GFP_KERNEL); |
4c9dacb8 WT |
347 | if (!area) |
348 | return -ENOMEM; | |
349 | ||
350 | prev = NULL; | |
351 | ||
352 | spin_lock(&dev->lock); | |
353 | list_for_each_entry(next, &gn->area_list, list) { | |
354 | if (begin + len > next->begin) { | |
355 | begin = next->end; | |
356 | prev = next; | |
357 | continue; | |
358 | } | |
359 | break; | |
360 | } | |
361 | ||
362 | if ((begin + len) > max_sectors) { | |
363 | spin_unlock(&dev->lock); | |
364 | kfree(area); | |
365 | return -EINVAL; | |
366 | } | |
367 | ||
368 | area->begin = *lba = begin; | |
369 | area->end = begin + len; | |
370 | ||
371 | if (prev) /* insert into sorted order */ | |
372 | list_add(&area->list, &prev->list); | |
373 | else | |
374 | list_add(&area->list, &gn->area_list); | |
375 | spin_unlock(&dev->lock); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
5e60edb7 | 380 | static void gen_put_area(struct nvm_dev *dev, sector_t begin) |
4c9dacb8 | 381 | { |
5e60edb7 MB |
382 | struct gen_dev *gn = dev->mp; |
383 | struct gen_area *area; | |
4c9dacb8 WT |
384 | |
385 | spin_lock(&dev->lock); | |
386 | list_for_each_entry(area, &gn->area_list, list) { | |
387 | if (area->begin != begin) | |
388 | continue; | |
389 | ||
390 | list_del(&area->list); | |
391 | spin_unlock(&dev->lock); | |
392 | kfree(area); | |
393 | return; | |
394 | } | |
395 | spin_unlock(&dev->lock); | |
396 | } | |
397 | ||
5e60edb7 | 398 | static void gen_free(struct nvm_dev *dev) |
8261bd48 | 399 | { |
8261bd48 | 400 | kfree(dev->mp); |
8e53624d | 401 | kfree(dev->rmap); |
8261bd48 WT |
402 | dev->mp = NULL; |
403 | } | |
404 | ||
5e60edb7 | 405 | static int gen_register(struct nvm_dev *dev) |
48add0f5 | 406 | { |
5e60edb7 | 407 | struct gen_dev *gn; |
8e53624d JG |
408 | struct gen_dev_map *dev_rmap; |
409 | int i, j; | |
48add0f5 | 410 | |
008b7443 MB |
411 | if (!try_module_get(THIS_MODULE)) |
412 | return -ENODEV; | |
413 | ||
5e60edb7 | 414 | gn = kzalloc(sizeof(struct gen_dev), GFP_KERNEL); |
48add0f5 | 415 | if (!gn) |
8e53624d JG |
416 | goto err_gn; |
417 | ||
418 | dev_rmap = kmalloc(sizeof(struct gen_dev_map), GFP_KERNEL); | |
419 | if (!dev_rmap) | |
420 | goto err_rmap; | |
421 | ||
422 | dev_rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct gen_ch_map), | |
423 | GFP_KERNEL); | |
424 | if (!dev_rmap->chnls) | |
425 | goto err_chnls; | |
426 | ||
427 | for (i = 0; i < dev->geo.nr_chnls; i++) { | |
428 | struct gen_ch_map *ch_rmap; | |
429 | int *lun_roffs; | |
430 | int luns_in_chnl = dev->geo.luns_per_chnl; | |
431 | ||
432 | ch_rmap = &dev_rmap->chnls[i]; | |
433 | ||
434 | ch_rmap->ch_off = -1; | |
435 | ch_rmap->nr_luns = luns_in_chnl; | |
436 | ||
437 | lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); | |
438 | if (!lun_roffs) | |
439 | goto err_ch; | |
440 | ||
441 | for (j = 0; j < luns_in_chnl; j++) | |
442 | lun_roffs[j] = -1; | |
443 | ||
444 | ch_rmap->lun_offs = lun_roffs; | |
445 | } | |
48add0f5 | 446 | |
11450469 | 447 | gn->dev = dev; |
8e79b5cb | 448 | gn->nr_luns = dev->geo.nr_luns; |
4c9dacb8 | 449 | INIT_LIST_HEAD(&gn->area_list); |
b76eb20b MB |
450 | mutex_init(&gn->lock); |
451 | INIT_LIST_HEAD(&gn->targets); | |
48add0f5 | 452 | dev->mp = gn; |
8e53624d | 453 | dev->rmap = dev_rmap; |
48add0f5 | 454 | |
48add0f5 | 455 | return 1; |
8e53624d JG |
456 | err_ch: |
457 | while (--i >= 0) | |
458 | kfree(dev_rmap->chnls[i].lun_offs); | |
459 | err_chnls: | |
460 | kfree(dev_rmap); | |
461 | err_rmap: | |
5e60edb7 | 462 | gen_free(dev); |
8e53624d | 463 | err_gn: |
008b7443 | 464 | module_put(THIS_MODULE); |
8e53624d | 465 | return -ENOMEM; |
48add0f5 MB |
466 | } |
467 | ||
5e60edb7 | 468 | static void gen_unregister(struct nvm_dev *dev) |
48add0f5 | 469 | { |
b76eb20b MB |
470 | struct gen_dev *gn = dev->mp; |
471 | struct nvm_target *t, *tmp; | |
472 | ||
473 | mutex_lock(&gn->lock); | |
474 | list_for_each_entry_safe(t, tmp, &gn->targets, list) { | |
8e79b5cb | 475 | if (t->dev->parent != dev) |
b76eb20b MB |
476 | continue; |
477 | __gen_remove_target(t); | |
478 | } | |
479 | mutex_unlock(&gn->lock); | |
480 | ||
5e60edb7 | 481 | gen_free(dev); |
008b7443 | 482 | module_put(THIS_MODULE); |
48add0f5 MB |
483 | } |
484 | ||
8e53624d JG |
485 | static int gen_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) |
486 | { | |
487 | struct gen_dev_map *dev_map = tgt_dev->map; | |
488 | struct gen_ch_map *ch_map = &dev_map->chnls[p->g.ch]; | |
489 | int lun_off = ch_map->lun_offs[p->g.lun]; | |
490 | struct nvm_dev *dev = tgt_dev->parent; | |
491 | struct gen_dev_map *dev_rmap = dev->rmap; | |
492 | struct gen_ch_map *ch_rmap; | |
493 | int lun_roff; | |
494 | ||
495 | p->g.ch += ch_map->ch_off; | |
496 | p->g.lun += lun_off; | |
497 | ||
498 | ch_rmap = &dev_rmap->chnls[p->g.ch]; | |
499 | lun_roff = ch_rmap->lun_offs[p->g.lun]; | |
500 | ||
501 | if (unlikely(ch_rmap->ch_off < 0 || lun_roff < 0)) { | |
502 | pr_err("nvm: corrupted device partition table\n"); | |
503 | return -EINVAL; | |
504 | } | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static int gen_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) | |
510 | { | |
511 | struct nvm_dev *dev = tgt_dev->parent; | |
512 | struct gen_dev_map *dev_rmap = dev->rmap; | |
513 | struct gen_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch]; | |
514 | int lun_roff = ch_rmap->lun_offs[p->g.lun]; | |
515 | ||
516 | p->g.ch -= ch_rmap->ch_off; | |
517 | p->g.lun -= lun_roff; | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | static int gen_trans_rq(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, | |
523 | int flag) | |
524 | { | |
525 | gen_trans_fn *f; | |
526 | int i; | |
527 | int ret = 0; | |
528 | ||
529 | f = (flag == TRANS_TGT_TO_DEV) ? gen_map_to_dev : gen_map_to_tgt; | |
530 | ||
531 | if (rqd->nr_ppas == 1) | |
532 | return f(tgt_dev, &rqd->ppa_addr); | |
533 | ||
534 | for (i = 0; i < rqd->nr_ppas; i++) { | |
535 | ret = f(tgt_dev, &rqd->ppa_list[i]); | |
536 | if (ret) | |
537 | goto out; | |
538 | } | |
539 | ||
540 | out: | |
541 | return ret; | |
542 | } | |
543 | ||
5e60edb7 | 544 | static void gen_end_io(struct nvm_rq *rqd) |
48add0f5 | 545 | { |
8e53624d | 546 | struct nvm_tgt_dev *tgt_dev = rqd->dev; |
48add0f5 | 547 | struct nvm_tgt_instance *ins = rqd->ins; |
48add0f5 | 548 | |
8e53624d JG |
549 | /* Convert address space */ |
550 | if (tgt_dev) | |
551 | gen_trans_rq(tgt_dev, rqd, TRANS_DEV_TO_TGT); | |
552 | ||
72d256ec | 553 | ins->tt->end_io(rqd); |
91276162 | 554 | } |
48add0f5 | 555 | |
8e53624d | 556 | static int gen_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) |
91276162 | 557 | { |
8e53624d JG |
558 | struct nvm_dev *dev = tgt_dev->parent; |
559 | ||
91276162 MB |
560 | if (!dev->ops->submit_io) |
561 | return -ENODEV; | |
562 | ||
563 | /* Convert address space */ | |
8e53624d | 564 | gen_trans_rq(tgt_dev, rqd, TRANS_TGT_TO_DEV); |
91276162 MB |
565 | nvm_generic_to_addr_mode(dev, rqd); |
566 | ||
8e53624d | 567 | rqd->dev = tgt_dev; |
5e60edb7 | 568 | rqd->end_io = gen_end_io; |
91276162 | 569 | return dev->ops->submit_io(dev, rqd); |
48add0f5 MB |
570 | } |
571 | ||
8e53624d JG |
572 | static int gen_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p, |
573 | int flags) | |
48add0f5 | 574 | { |
8e53624d JG |
575 | /* Convert address space */ |
576 | gen_map_to_dev(tgt_dev, p); | |
577 | ||
578 | return nvm_erase_ppa(tgt_dev->parent, p, 1, flags); | |
579 | } | |
580 | ||
333ba053 JG |
581 | static struct ppa_addr gen_trans_ppa(struct nvm_tgt_dev *tgt_dev, |
582 | struct ppa_addr p, int direction) | |
583 | { | |
584 | gen_trans_fn *f; | |
585 | struct ppa_addr ppa = p; | |
586 | ||
587 | f = (direction == TRANS_TGT_TO_DEV) ? gen_map_to_dev : gen_map_to_tgt; | |
588 | f(tgt_dev, &ppa); | |
589 | ||
590 | return ppa; | |
591 | } | |
592 | ||
8e53624d JG |
593 | static void gen_part_to_tgt(struct nvm_dev *dev, sector_t *entries, |
594 | int len) | |
595 | { | |
596 | struct nvm_geo *geo = &dev->geo; | |
597 | struct gen_dev_map *dev_rmap = dev->rmap; | |
598 | u64 i; | |
599 | ||
600 | for (i = 0; i < len; i++) { | |
601 | struct gen_ch_map *ch_rmap; | |
602 | int *lun_roffs; | |
603 | struct ppa_addr gaddr; | |
604 | u64 pba = le64_to_cpu(entries[i]); | |
605 | int off; | |
606 | u64 diff; | |
607 | ||
608 | if (!pba) | |
609 | continue; | |
610 | ||
611 | gaddr = linear_to_generic_addr(geo, pba); | |
612 | ch_rmap = &dev_rmap->chnls[gaddr.g.ch]; | |
613 | lun_roffs = ch_rmap->lun_offs; | |
614 | ||
615 | off = gaddr.g.ch * geo->luns_per_chnl + gaddr.g.lun; | |
616 | ||
617 | diff = ((ch_rmap->ch_off * geo->luns_per_chnl) + | |
618 | (lun_roffs[gaddr.g.lun])) * geo->sec_per_lun; | |
619 | ||
620 | entries[i] -= cpu_to_le64(diff); | |
621 | } | |
48add0f5 MB |
622 | } |
623 | ||
5e60edb7 | 624 | static struct nvmm_type gen = { |
ff0e498b JG |
625 | .name = "gennvm", |
626 | .version = {0, 1, 0}, | |
627 | ||
5e60edb7 MB |
628 | .register_mgr = gen_register, |
629 | .unregister_mgr = gen_unregister, | |
48add0f5 | 630 | |
b76eb20b MB |
631 | .create_tgt = gen_create_tgt, |
632 | .remove_tgt = gen_remove_tgt, | |
633 | ||
5e60edb7 MB |
634 | .submit_io = gen_submit_io, |
635 | .erase_blk = gen_erase_blk, | |
48add0f5 | 636 | |
5e60edb7 MB |
637 | .get_area = gen_get_area, |
638 | .put_area = gen_put_area, | |
4c9dacb8 | 639 | |
333ba053 | 640 | .trans_ppa = gen_trans_ppa, |
8e53624d | 641 | .part_to_tgt = gen_part_to_tgt, |
48add0f5 MB |
642 | }; |
643 | ||
5e60edb7 | 644 | static int __init gen_module_init(void) |
48add0f5 | 645 | { |
5e60edb7 | 646 | return nvm_register_mgr(&gen); |
48add0f5 MB |
647 | } |
648 | ||
5e60edb7 | 649 | static void gen_module_exit(void) |
48add0f5 | 650 | { |
5e60edb7 | 651 | nvm_unregister_mgr(&gen); |
48add0f5 MB |
652 | } |
653 | ||
5e60edb7 MB |
654 | module_init(gen_module_init); |
655 | module_exit(gen_module_exit); | |
48add0f5 | 656 | MODULE_LICENSE("GPL v2"); |
5e60edb7 | 657 | MODULE_DESCRIPTION("General media manager for Open-Channel SSDs"); |