Commit | Line | Data |
---|---|---|
cd9e9808 MB |
1 | /* |
2 | * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. | |
3 | * Initial release: Matias Bjorling <m@bjorling.me> | |
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 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; see the file COPYING. If not, write to | |
16 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
17 | * USA. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/blkdev.h> | |
22 | #include <linux/blk-mq.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/sem.h> | |
26 | #include <linux/bitmap.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/miscdevice.h> | |
29 | #include <linux/lightnvm.h> | |
30 | #include <uapi/linux/lightnvm.h> | |
31 | ||
32 | static LIST_HEAD(nvm_targets); | |
33 | static LIST_HEAD(nvm_mgrs); | |
34 | static LIST_HEAD(nvm_devices); | |
35 | static DECLARE_RWSEM(nvm_lock); | |
36 | ||
37 | static struct nvm_tgt_type *nvm_find_target_type(const char *name) | |
38 | { | |
39 | struct nvm_tgt_type *tt; | |
40 | ||
41 | list_for_each_entry(tt, &nvm_targets, list) | |
42 | if (!strcmp(name, tt->name)) | |
43 | return tt; | |
44 | ||
45 | return NULL; | |
46 | } | |
47 | ||
48 | int nvm_register_target(struct nvm_tgt_type *tt) | |
49 | { | |
50 | int ret = 0; | |
51 | ||
52 | down_write(&nvm_lock); | |
53 | if (nvm_find_target_type(tt->name)) | |
54 | ret = -EEXIST; | |
55 | else | |
56 | list_add(&tt->list, &nvm_targets); | |
57 | up_write(&nvm_lock); | |
58 | ||
59 | return ret; | |
60 | } | |
61 | EXPORT_SYMBOL(nvm_register_target); | |
62 | ||
63 | void nvm_unregister_target(struct nvm_tgt_type *tt) | |
64 | { | |
65 | if (!tt) | |
66 | return; | |
67 | ||
68 | down_write(&nvm_lock); | |
69 | list_del(&tt->list); | |
70 | up_write(&nvm_lock); | |
71 | } | |
72 | EXPORT_SYMBOL(nvm_unregister_target); | |
73 | ||
74 | void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, | |
75 | dma_addr_t *dma_handler) | |
76 | { | |
16f26c3a | 77 | return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags, |
cd9e9808 MB |
78 | dma_handler); |
79 | } | |
80 | EXPORT_SYMBOL(nvm_dev_dma_alloc); | |
81 | ||
82 | void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list, | |
83 | dma_addr_t dma_handler) | |
84 | { | |
85 | dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler); | |
86 | } | |
87 | EXPORT_SYMBOL(nvm_dev_dma_free); | |
88 | ||
89 | static struct nvmm_type *nvm_find_mgr_type(const char *name) | |
90 | { | |
91 | struct nvmm_type *mt; | |
92 | ||
93 | list_for_each_entry(mt, &nvm_mgrs, list) | |
94 | if (!strcmp(name, mt->name)) | |
95 | return mt; | |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
762796bc MB |
100 | struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev) |
101 | { | |
102 | struct nvmm_type *mt; | |
103 | int ret; | |
104 | ||
105 | lockdep_assert_held(&nvm_lock); | |
106 | ||
107 | list_for_each_entry(mt, &nvm_mgrs, list) { | |
108 | ret = mt->register_mgr(dev); | |
109 | if (ret < 0) { | |
110 | pr_err("nvm: media mgr failed to init (%d) on dev %s\n", | |
111 | ret, dev->name); | |
112 | return NULL; /* initialization failed */ | |
113 | } else if (ret > 0) | |
114 | return mt; | |
115 | } | |
116 | ||
117 | return NULL; | |
118 | } | |
119 | ||
cd9e9808 MB |
120 | int nvm_register_mgr(struct nvmm_type *mt) |
121 | { | |
762796bc | 122 | struct nvm_dev *dev; |
cd9e9808 MB |
123 | int ret = 0; |
124 | ||
125 | down_write(&nvm_lock); | |
762796bc | 126 | if (nvm_find_mgr_type(mt->name)) { |
cd9e9808 | 127 | ret = -EEXIST; |
762796bc MB |
128 | goto finish; |
129 | } else { | |
cd9e9808 | 130 | list_add(&mt->list, &nvm_mgrs); |
762796bc MB |
131 | } |
132 | ||
133 | /* try to register media mgr if any device have none configured */ | |
134 | list_for_each_entry(dev, &nvm_devices, devices) { | |
135 | if (dev->mt) | |
136 | continue; | |
137 | ||
138 | dev->mt = nvm_init_mgr(dev); | |
139 | } | |
140 | finish: | |
cd9e9808 MB |
141 | up_write(&nvm_lock); |
142 | ||
143 | return ret; | |
144 | } | |
145 | EXPORT_SYMBOL(nvm_register_mgr); | |
146 | ||
147 | void nvm_unregister_mgr(struct nvmm_type *mt) | |
148 | { | |
149 | if (!mt) | |
150 | return; | |
151 | ||
152 | down_write(&nvm_lock); | |
153 | list_del(&mt->list); | |
154 | up_write(&nvm_lock); | |
155 | } | |
156 | EXPORT_SYMBOL(nvm_unregister_mgr); | |
157 | ||
158 | static struct nvm_dev *nvm_find_nvm_dev(const char *name) | |
159 | { | |
160 | struct nvm_dev *dev; | |
161 | ||
162 | list_for_each_entry(dev, &nvm_devices, devices) | |
163 | if (!strcmp(name, dev->name)) | |
164 | return dev; | |
165 | ||
166 | return NULL; | |
167 | } | |
168 | ||
169 | struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun, | |
170 | unsigned long flags) | |
171 | { | |
172 | return dev->mt->get_blk(dev, lun, flags); | |
173 | } | |
174 | EXPORT_SYMBOL(nvm_get_blk); | |
175 | ||
176 | /* Assumes that all valid pages have already been moved on release to bm */ | |
177 | void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
178 | { | |
179 | return dev->mt->put_blk(dev, blk); | |
180 | } | |
181 | EXPORT_SYMBOL(nvm_put_blk); | |
182 | ||
183 | int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) | |
184 | { | |
185 | return dev->mt->submit_io(dev, rqd); | |
186 | } | |
187 | EXPORT_SYMBOL(nvm_submit_io); | |
188 | ||
189 | int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
190 | { | |
191 | return dev->mt->erase_blk(dev, blk, 0); | |
192 | } | |
193 | EXPORT_SYMBOL(nvm_erase_blk); | |
194 | ||
069368e9 MB |
195 | void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd) |
196 | { | |
197 | int i; | |
198 | ||
199 | if (rqd->nr_pages > 1) { | |
200 | for (i = 0; i < rqd->nr_pages; i++) | |
201 | rqd->ppa_list[i] = dev_to_generic_addr(dev, | |
202 | rqd->ppa_list[i]); | |
203 | } else { | |
204 | rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr); | |
205 | } | |
206 | } | |
207 | EXPORT_SYMBOL(nvm_addr_to_generic_mode); | |
208 | ||
209 | void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd) | |
210 | { | |
211 | int i; | |
212 | ||
213 | if (rqd->nr_pages > 1) { | |
214 | for (i = 0; i < rqd->nr_pages; i++) | |
215 | rqd->ppa_list[i] = generic_to_dev_addr(dev, | |
216 | rqd->ppa_list[i]); | |
217 | } else { | |
218 | rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr); | |
219 | } | |
220 | } | |
221 | EXPORT_SYMBOL(nvm_generic_to_addr_mode); | |
222 | ||
abd805ec MB |
223 | int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd, |
224 | struct ppa_addr *ppas, int nr_ppas) | |
069368e9 | 225 | { |
abd805ec MB |
226 | int i, plane_cnt, pl_idx; |
227 | ||
228 | if (dev->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { | |
229 | rqd->nr_pages = 1; | |
230 | rqd->ppa_addr = ppas[0]; | |
069368e9 | 231 | |
069368e9 | 232 | return 0; |
abd805ec | 233 | } |
069368e9 | 234 | |
abd805ec MB |
235 | plane_cnt = (1 << dev->plane_mode); |
236 | rqd->nr_pages = plane_cnt * nr_ppas; | |
069368e9 | 237 | |
abd805ec MB |
238 | if (dev->ops->max_phys_sect < rqd->nr_pages) |
239 | return -EINVAL; | |
240 | ||
241 | rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); | |
242 | if (!rqd->ppa_list) { | |
243 | pr_err("nvm: failed to allocate dma memory\n"); | |
244 | return -ENOMEM; | |
245 | } | |
246 | ||
247 | for (i = 0; i < nr_ppas; i++) { | |
069368e9 | 248 | for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { |
abd805ec MB |
249 | ppas[i].g.pl = pl_idx; |
250 | rqd->ppa_list[(i * plane_cnt) + pl_idx] = ppas[i]; | |
069368e9 MB |
251 | } |
252 | } | |
253 | ||
abd805ec MB |
254 | return 0; |
255 | } | |
256 | EXPORT_SYMBOL(nvm_set_rqd_ppalist); | |
257 | ||
258 | void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd) | |
259 | { | |
260 | if (!rqd->ppa_list) | |
261 | return; | |
262 | ||
263 | nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list); | |
264 | } | |
265 | EXPORT_SYMBOL(nvm_free_rqd_ppalist); | |
266 | ||
267 | int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr ppa) | |
268 | { | |
269 | struct nvm_rq rqd; | |
270 | int ret; | |
271 | ||
272 | if (!dev->ops->erase_block) | |
273 | return 0; | |
274 | ||
275 | memset(&rqd, 0, sizeof(struct nvm_rq)); | |
276 | ||
277 | ret = nvm_set_rqd_ppalist(dev, &rqd, &ppa, 1); | |
278 | if (ret) | |
279 | return ret; | |
280 | ||
069368e9 MB |
281 | nvm_generic_to_addr_mode(dev, &rqd); |
282 | ||
283 | ret = dev->ops->erase_block(dev, &rqd); | |
284 | ||
abd805ec | 285 | nvm_free_rqd_ppalist(dev, &rqd); |
069368e9 MB |
286 | |
287 | return ret; | |
288 | } | |
289 | EXPORT_SYMBOL(nvm_erase_ppa); | |
290 | ||
cd9e9808 MB |
291 | static int nvm_core_init(struct nvm_dev *dev) |
292 | { | |
293 | struct nvm_id *id = &dev->identity; | |
294 | struct nvm_id_group *grp = &id->groups[0]; | |
295 | ||
296 | /* device values */ | |
297 | dev->nr_chnls = grp->num_ch; | |
298 | dev->luns_per_chnl = grp->num_lun; | |
299 | dev->pgs_per_blk = grp->num_pg; | |
300 | dev->blks_per_lun = grp->num_blk; | |
301 | dev->nr_planes = grp->num_pln; | |
302 | dev->sec_size = grp->csecs; | |
303 | dev->oob_size = grp->sos; | |
304 | dev->sec_per_pg = grp->fpg_sz / grp->csecs; | |
7386af27 | 305 | memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format)); |
cd9e9808 MB |
306 | |
307 | dev->plane_mode = NVM_PLANE_SINGLE; | |
308 | dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size; | |
309 | ||
4264c980 MB |
310 | if (grp->mtype != 0) { |
311 | pr_err("nvm: memory type not supported\n"); | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | if (grp->fmtype != 0 && grp->fmtype != 1) { | |
316 | pr_err("nvm: flash type not supported\n"); | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
cd9e9808 MB |
320 | if (grp->mpos & 0x020202) |
321 | dev->plane_mode = NVM_PLANE_DOUBLE; | |
322 | if (grp->mpos & 0x040404) | |
323 | dev->plane_mode = NVM_PLANE_QUAD; | |
324 | ||
325 | /* calculated values */ | |
326 | dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes; | |
327 | dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk; | |
328 | dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun; | |
329 | dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls; | |
330 | ||
331 | dev->total_blocks = dev->nr_planes * | |
332 | dev->blks_per_lun * | |
333 | dev->luns_per_chnl * | |
334 | dev->nr_chnls; | |
335 | dev->total_pages = dev->total_blocks * dev->pgs_per_blk; | |
336 | INIT_LIST_HEAD(&dev->online_targets); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static void nvm_free(struct nvm_dev *dev) | |
342 | { | |
343 | if (!dev) | |
344 | return; | |
345 | ||
346 | if (dev->mt) | |
347 | dev->mt->unregister_mgr(dev); | |
cd9e9808 MB |
348 | } |
349 | ||
350 | static int nvm_init(struct nvm_dev *dev) | |
351 | { | |
480fc0db | 352 | int ret = -EINVAL; |
cd9e9808 MB |
353 | |
354 | if (!dev->q || !dev->ops) | |
480fc0db | 355 | return ret; |
cd9e9808 | 356 | |
16f26c3a | 357 | if (dev->ops->identity(dev, &dev->identity)) { |
cd9e9808 | 358 | pr_err("nvm: device could not be identified\n"); |
cd9e9808 MB |
359 | goto err; |
360 | } | |
361 | ||
362 | pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n", | |
363 | dev->identity.ver_id, dev->identity.vmnt, | |
364 | dev->identity.cgrps); | |
365 | ||
366 | if (dev->identity.ver_id != 1) { | |
367 | pr_err("nvm: device not supported by kernel."); | |
368 | goto err; | |
369 | } | |
370 | ||
371 | if (dev->identity.cgrps != 1) { | |
372 | pr_err("nvm: only one group configuration supported."); | |
373 | goto err; | |
374 | } | |
375 | ||
376 | ret = nvm_core_init(dev); | |
377 | if (ret) { | |
378 | pr_err("nvm: could not initialize core structures.\n"); | |
379 | goto err; | |
380 | } | |
381 | ||
cd9e9808 MB |
382 | pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n", |
383 | dev->name, dev->sec_per_pg, dev->nr_planes, | |
384 | dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns, | |
385 | dev->nr_chnls); | |
386 | return 0; | |
387 | err: | |
cd9e9808 MB |
388 | pr_err("nvm: failed to initialize nvm\n"); |
389 | return ret; | |
390 | } | |
391 | ||
392 | static void nvm_exit(struct nvm_dev *dev) | |
393 | { | |
394 | if (dev->ppalist_pool) | |
395 | dev->ops->destroy_dma_pool(dev->ppalist_pool); | |
396 | nvm_free(dev); | |
397 | ||
398 | pr_info("nvm: successfully unloaded\n"); | |
399 | } | |
400 | ||
401 | int nvm_register(struct request_queue *q, char *disk_name, | |
402 | struct nvm_dev_ops *ops) | |
403 | { | |
404 | struct nvm_dev *dev; | |
405 | int ret; | |
406 | ||
407 | if (!ops->identity) | |
408 | return -EINVAL; | |
409 | ||
410 | dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL); | |
411 | if (!dev) | |
412 | return -ENOMEM; | |
413 | ||
414 | dev->q = q; | |
415 | dev->ops = ops; | |
416 | strncpy(dev->name, disk_name, DISK_NAME_LEN); | |
417 | ||
418 | ret = nvm_init(dev); | |
419 | if (ret) | |
420 | goto err_init; | |
421 | ||
d160147b WT |
422 | if (dev->ops->max_phys_sect > 256) { |
423 | pr_info("nvm: max sectors supported is 256.\n"); | |
424 | ret = -EINVAL; | |
425 | goto err_init; | |
426 | } | |
427 | ||
cd9e9808 | 428 | if (dev->ops->max_phys_sect > 1) { |
16f26c3a | 429 | dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist"); |
cd9e9808 MB |
430 | if (!dev->ppalist_pool) { |
431 | pr_err("nvm: could not create ppa pool\n"); | |
93e70c1f MB |
432 | ret = -ENOMEM; |
433 | goto err_init; | |
cd9e9808 | 434 | } |
cd9e9808 MB |
435 | } |
436 | ||
762796bc | 437 | /* register device with a supported media manager */ |
edad2e66 | 438 | down_write(&nvm_lock); |
762796bc | 439 | dev->mt = nvm_init_mgr(dev); |
edad2e66 MB |
440 | list_add(&dev->devices, &nvm_devices); |
441 | up_write(&nvm_lock); | |
442 | ||
cd9e9808 MB |
443 | return 0; |
444 | err_init: | |
445 | kfree(dev); | |
446 | return ret; | |
447 | } | |
448 | EXPORT_SYMBOL(nvm_register); | |
449 | ||
450 | void nvm_unregister(char *disk_name) | |
451 | { | |
d0a712ce | 452 | struct nvm_dev *dev; |
cd9e9808 | 453 | |
d0a712ce WT |
454 | down_write(&nvm_lock); |
455 | dev = nvm_find_nvm_dev(disk_name); | |
cd9e9808 MB |
456 | if (!dev) { |
457 | pr_err("nvm: could not find device %s to unregister\n", | |
458 | disk_name); | |
d0a712ce | 459 | up_write(&nvm_lock); |
cd9e9808 MB |
460 | return; |
461 | } | |
462 | ||
cd9e9808 MB |
463 | list_del(&dev->devices); |
464 | up_write(&nvm_lock); | |
c1480ad5 MB |
465 | |
466 | nvm_exit(dev); | |
467 | kfree(dev); | |
cd9e9808 MB |
468 | } |
469 | EXPORT_SYMBOL(nvm_unregister); | |
470 | ||
471 | static const struct block_device_operations nvm_fops = { | |
472 | .owner = THIS_MODULE, | |
473 | }; | |
474 | ||
475 | static int nvm_create_target(struct nvm_dev *dev, | |
476 | struct nvm_ioctl_create *create) | |
477 | { | |
478 | struct nvm_ioctl_create_simple *s = &create->conf.s; | |
479 | struct request_queue *tqueue; | |
cd9e9808 MB |
480 | struct gendisk *tdisk; |
481 | struct nvm_tgt_type *tt; | |
482 | struct nvm_target *t; | |
483 | void *targetdata; | |
cd9e9808 MB |
484 | |
485 | if (!dev->mt) { | |
762796bc MB |
486 | pr_info("nvm: device has no media manager registered.\n"); |
487 | return -ENODEV; | |
cd9e9808 MB |
488 | } |
489 | ||
762796bc | 490 | down_write(&nvm_lock); |
cd9e9808 MB |
491 | tt = nvm_find_target_type(create->tgttype); |
492 | if (!tt) { | |
493 | pr_err("nvm: target type %s not found\n", create->tgttype); | |
d0a712ce | 494 | up_write(&nvm_lock); |
cd9e9808 MB |
495 | return -EINVAL; |
496 | } | |
497 | ||
cd9e9808 MB |
498 | list_for_each_entry(t, &dev->online_targets, list) { |
499 | if (!strcmp(create->tgtname, t->disk->disk_name)) { | |
500 | pr_err("nvm: target name already exists.\n"); | |
501 | up_write(&nvm_lock); | |
502 | return -EINVAL; | |
503 | } | |
504 | } | |
505 | up_write(&nvm_lock); | |
506 | ||
507 | t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); | |
508 | if (!t) | |
509 | return -ENOMEM; | |
510 | ||
511 | tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); | |
512 | if (!tqueue) | |
513 | goto err_t; | |
514 | blk_queue_make_request(tqueue, tt->make_rq); | |
515 | ||
516 | tdisk = alloc_disk(0); | |
517 | if (!tdisk) | |
518 | goto err_queue; | |
519 | ||
520 | sprintf(tdisk->disk_name, "%s", create->tgtname); | |
521 | tdisk->flags = GENHD_FL_EXT_DEVT; | |
522 | tdisk->major = 0; | |
523 | tdisk->first_minor = 0; | |
524 | tdisk->fops = &nvm_fops; | |
525 | tdisk->queue = tqueue; | |
526 | ||
527 | targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end); | |
528 | if (IS_ERR(targetdata)) | |
529 | goto err_init; | |
530 | ||
531 | tdisk->private_data = targetdata; | |
532 | tqueue->queuedata = targetdata; | |
533 | ||
534 | blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect); | |
535 | ||
536 | set_capacity(tdisk, tt->capacity(targetdata)); | |
537 | add_disk(tdisk); | |
538 | ||
539 | t->type = tt; | |
540 | t->disk = tdisk; | |
541 | ||
542 | down_write(&nvm_lock); | |
543 | list_add_tail(&t->list, &dev->online_targets); | |
544 | up_write(&nvm_lock); | |
545 | ||
546 | return 0; | |
547 | err_init: | |
548 | put_disk(tdisk); | |
549 | err_queue: | |
550 | blk_cleanup_queue(tqueue); | |
551 | err_t: | |
552 | kfree(t); | |
553 | return -ENOMEM; | |
554 | } | |
555 | ||
556 | static void nvm_remove_target(struct nvm_target *t) | |
557 | { | |
558 | struct nvm_tgt_type *tt = t->type; | |
559 | struct gendisk *tdisk = t->disk; | |
560 | struct request_queue *q = tdisk->queue; | |
561 | ||
562 | lockdep_assert_held(&nvm_lock); | |
563 | ||
564 | del_gendisk(tdisk); | |
d09f9581 JG |
565 | blk_cleanup_queue(q); |
566 | ||
cd9e9808 MB |
567 | if (tt->exit) |
568 | tt->exit(tdisk->private_data); | |
569 | ||
cd9e9808 MB |
570 | put_disk(tdisk); |
571 | ||
572 | list_del(&t->list); | |
573 | kfree(t); | |
574 | } | |
575 | ||
576 | static int __nvm_configure_create(struct nvm_ioctl_create *create) | |
577 | { | |
578 | struct nvm_dev *dev; | |
579 | struct nvm_ioctl_create_simple *s; | |
580 | ||
d0a712ce | 581 | down_write(&nvm_lock); |
cd9e9808 | 582 | dev = nvm_find_nvm_dev(create->dev); |
d0a712ce | 583 | up_write(&nvm_lock); |
cd9e9808 MB |
584 | if (!dev) { |
585 | pr_err("nvm: device not found\n"); | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) { | |
590 | pr_err("nvm: config type not valid\n"); | |
591 | return -EINVAL; | |
592 | } | |
593 | s = &create->conf.s; | |
594 | ||
595 | if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) { | |
596 | pr_err("nvm: lun out of bound (%u:%u > %u)\n", | |
597 | s->lun_begin, s->lun_end, dev->nr_luns); | |
598 | return -EINVAL; | |
599 | } | |
600 | ||
601 | return nvm_create_target(dev, create); | |
602 | } | |
603 | ||
604 | static int __nvm_configure_remove(struct nvm_ioctl_remove *remove) | |
605 | { | |
606 | struct nvm_target *t = NULL; | |
607 | struct nvm_dev *dev; | |
608 | int ret = -1; | |
609 | ||
610 | down_write(&nvm_lock); | |
611 | list_for_each_entry(dev, &nvm_devices, devices) | |
612 | list_for_each_entry(t, &dev->online_targets, list) { | |
613 | if (!strcmp(remove->tgtname, t->disk->disk_name)) { | |
614 | nvm_remove_target(t); | |
615 | ret = 0; | |
616 | break; | |
617 | } | |
618 | } | |
619 | up_write(&nvm_lock); | |
620 | ||
621 | if (ret) { | |
622 | pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname); | |
623 | return -EINVAL; | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | #ifdef CONFIG_NVM_DEBUG | |
630 | static int nvm_configure_show(const char *val) | |
631 | { | |
632 | struct nvm_dev *dev; | |
633 | char opcode, devname[DISK_NAME_LEN]; | |
634 | int ret; | |
635 | ||
636 | ret = sscanf(val, "%c %32s", &opcode, devname); | |
637 | if (ret != 2) { | |
638 | pr_err("nvm: invalid command. Use \"opcode devicename\".\n"); | |
639 | return -EINVAL; | |
640 | } | |
641 | ||
d0a712ce | 642 | down_write(&nvm_lock); |
cd9e9808 | 643 | dev = nvm_find_nvm_dev(devname); |
d0a712ce | 644 | up_write(&nvm_lock); |
cd9e9808 MB |
645 | if (!dev) { |
646 | pr_err("nvm: device not found\n"); | |
647 | return -EINVAL; | |
648 | } | |
649 | ||
650 | if (!dev->mt) | |
651 | return 0; | |
652 | ||
2fde0e48 | 653 | dev->mt->lun_info_print(dev); |
cd9e9808 MB |
654 | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int nvm_configure_remove(const char *val) | |
659 | { | |
660 | struct nvm_ioctl_remove remove; | |
661 | char opcode; | |
662 | int ret; | |
663 | ||
664 | ret = sscanf(val, "%c %256s", &opcode, remove.tgtname); | |
665 | if (ret != 2) { | |
666 | pr_err("nvm: invalid command. Use \"d targetname\".\n"); | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
670 | remove.flags = 0; | |
671 | ||
672 | return __nvm_configure_remove(&remove); | |
673 | } | |
674 | ||
675 | static int nvm_configure_create(const char *val) | |
676 | { | |
677 | struct nvm_ioctl_create create; | |
678 | char opcode; | |
679 | int lun_begin, lun_end, ret; | |
680 | ||
681 | ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev, | |
682 | create.tgtname, create.tgttype, | |
683 | &lun_begin, &lun_end); | |
684 | if (ret != 6) { | |
685 | pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n"); | |
686 | return -EINVAL; | |
687 | } | |
688 | ||
689 | create.flags = 0; | |
690 | create.conf.type = NVM_CONFIG_TYPE_SIMPLE; | |
691 | create.conf.s.lun_begin = lun_begin; | |
692 | create.conf.s.lun_end = lun_end; | |
693 | ||
694 | return __nvm_configure_create(&create); | |
695 | } | |
696 | ||
697 | ||
698 | /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */ | |
699 | static int nvm_configure_by_str_event(const char *val, | |
700 | const struct kernel_param *kp) | |
701 | { | |
702 | char opcode; | |
703 | int ret; | |
704 | ||
705 | ret = sscanf(val, "%c", &opcode); | |
706 | if (ret != 1) { | |
707 | pr_err("nvm: string must have the format of \"cmd ...\"\n"); | |
708 | return -EINVAL; | |
709 | } | |
710 | ||
711 | switch (opcode) { | |
712 | case 'a': | |
713 | return nvm_configure_create(val); | |
714 | case 'd': | |
715 | return nvm_configure_remove(val); | |
716 | case 's': | |
717 | return nvm_configure_show(val); | |
718 | default: | |
719 | pr_err("nvm: invalid command\n"); | |
720 | return -EINVAL; | |
721 | } | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | static int nvm_configure_get(char *buf, const struct kernel_param *kp) | |
727 | { | |
728 | int sz = 0; | |
729 | char *buf_start = buf; | |
730 | struct nvm_dev *dev; | |
731 | ||
732 | buf += sprintf(buf, "available devices:\n"); | |
733 | down_write(&nvm_lock); | |
734 | list_for_each_entry(dev, &nvm_devices, devices) { | |
735 | if (sz > 4095 - DISK_NAME_LEN) | |
736 | break; | |
737 | buf += sprintf(buf, " %32s\n", dev->name); | |
738 | } | |
739 | up_write(&nvm_lock); | |
740 | ||
741 | return buf - buf_start - 1; | |
742 | } | |
743 | ||
744 | static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = { | |
745 | .set = nvm_configure_by_str_event, | |
746 | .get = nvm_configure_get, | |
747 | }; | |
748 | ||
749 | #undef MODULE_PARAM_PREFIX | |
750 | #define MODULE_PARAM_PREFIX "lnvm." | |
751 | ||
752 | module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL, | |
753 | 0644); | |
754 | ||
755 | #endif /* CONFIG_NVM_DEBUG */ | |
756 | ||
757 | static long nvm_ioctl_info(struct file *file, void __user *arg) | |
758 | { | |
759 | struct nvm_ioctl_info *info; | |
760 | struct nvm_tgt_type *tt; | |
761 | int tgt_iter = 0; | |
762 | ||
763 | if (!capable(CAP_SYS_ADMIN)) | |
764 | return -EPERM; | |
765 | ||
766 | info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); | |
767 | if (IS_ERR(info)) | |
768 | return -EFAULT; | |
769 | ||
770 | info->version[0] = NVM_VERSION_MAJOR; | |
771 | info->version[1] = NVM_VERSION_MINOR; | |
772 | info->version[2] = NVM_VERSION_PATCH; | |
773 | ||
774 | down_write(&nvm_lock); | |
775 | list_for_each_entry(tt, &nvm_targets, list) { | |
776 | struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; | |
777 | ||
778 | tgt->version[0] = tt->version[0]; | |
779 | tgt->version[1] = tt->version[1]; | |
780 | tgt->version[2] = tt->version[2]; | |
781 | strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); | |
782 | ||
783 | tgt_iter++; | |
784 | } | |
785 | ||
786 | info->tgtsize = tgt_iter; | |
787 | up_write(&nvm_lock); | |
788 | ||
76e25081 SM |
789 | if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { |
790 | kfree(info); | |
cd9e9808 | 791 | return -EFAULT; |
76e25081 | 792 | } |
cd9e9808 MB |
793 | |
794 | kfree(info); | |
795 | return 0; | |
796 | } | |
797 | ||
798 | static long nvm_ioctl_get_devices(struct file *file, void __user *arg) | |
799 | { | |
800 | struct nvm_ioctl_get_devices *devices; | |
801 | struct nvm_dev *dev; | |
802 | int i = 0; | |
803 | ||
804 | if (!capable(CAP_SYS_ADMIN)) | |
805 | return -EPERM; | |
806 | ||
807 | devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); | |
808 | if (!devices) | |
809 | return -ENOMEM; | |
810 | ||
811 | down_write(&nvm_lock); | |
812 | list_for_each_entry(dev, &nvm_devices, devices) { | |
813 | struct nvm_ioctl_device_info *info = &devices->info[i]; | |
814 | ||
815 | sprintf(info->devname, "%s", dev->name); | |
816 | if (dev->mt) { | |
817 | info->bmversion[0] = dev->mt->version[0]; | |
818 | info->bmversion[1] = dev->mt->version[1]; | |
819 | info->bmversion[2] = dev->mt->version[2]; | |
820 | sprintf(info->bmname, "%s", dev->mt->name); | |
821 | } else { | |
822 | sprintf(info->bmname, "none"); | |
823 | } | |
824 | ||
825 | i++; | |
826 | if (i > 31) { | |
827 | pr_err("nvm: max 31 devices can be reported.\n"); | |
828 | break; | |
829 | } | |
830 | } | |
831 | up_write(&nvm_lock); | |
832 | ||
833 | devices->nr_devices = i; | |
834 | ||
76e25081 SM |
835 | if (copy_to_user(arg, devices, |
836 | sizeof(struct nvm_ioctl_get_devices))) { | |
837 | kfree(devices); | |
cd9e9808 | 838 | return -EFAULT; |
76e25081 | 839 | } |
cd9e9808 MB |
840 | |
841 | kfree(devices); | |
842 | return 0; | |
843 | } | |
844 | ||
845 | static long nvm_ioctl_dev_create(struct file *file, void __user *arg) | |
846 | { | |
847 | struct nvm_ioctl_create create; | |
848 | ||
849 | if (!capable(CAP_SYS_ADMIN)) | |
850 | return -EPERM; | |
851 | ||
852 | if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) | |
853 | return -EFAULT; | |
854 | ||
855 | create.dev[DISK_NAME_LEN - 1] = '\0'; | |
856 | create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; | |
857 | create.tgtname[DISK_NAME_LEN - 1] = '\0'; | |
858 | ||
859 | if (create.flags != 0) { | |
860 | pr_err("nvm: no flags supported\n"); | |
861 | return -EINVAL; | |
862 | } | |
863 | ||
864 | return __nvm_configure_create(&create); | |
865 | } | |
866 | ||
867 | static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) | |
868 | { | |
869 | struct nvm_ioctl_remove remove; | |
870 | ||
871 | if (!capable(CAP_SYS_ADMIN)) | |
872 | return -EPERM; | |
873 | ||
874 | if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) | |
875 | return -EFAULT; | |
876 | ||
877 | remove.tgtname[DISK_NAME_LEN - 1] = '\0'; | |
878 | ||
879 | if (remove.flags != 0) { | |
880 | pr_err("nvm: no flags supported\n"); | |
881 | return -EINVAL; | |
882 | } | |
883 | ||
884 | return __nvm_configure_remove(&remove); | |
885 | } | |
886 | ||
887 | static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) | |
888 | { | |
889 | void __user *argp = (void __user *)arg; | |
890 | ||
891 | switch (cmd) { | |
892 | case NVM_INFO: | |
893 | return nvm_ioctl_info(file, argp); | |
894 | case NVM_GET_DEVICES: | |
895 | return nvm_ioctl_get_devices(file, argp); | |
896 | case NVM_DEV_CREATE: | |
897 | return nvm_ioctl_dev_create(file, argp); | |
898 | case NVM_DEV_REMOVE: | |
899 | return nvm_ioctl_dev_remove(file, argp); | |
900 | } | |
901 | return 0; | |
902 | } | |
903 | ||
904 | static const struct file_operations _ctl_fops = { | |
905 | .open = nonseekable_open, | |
906 | .unlocked_ioctl = nvm_ctl_ioctl, | |
907 | .owner = THIS_MODULE, | |
908 | .llseek = noop_llseek, | |
909 | }; | |
910 | ||
911 | static struct miscdevice _nvm_misc = { | |
912 | .minor = MISC_DYNAMIC_MINOR, | |
913 | .name = "lightnvm", | |
914 | .nodename = "lightnvm/control", | |
915 | .fops = &_ctl_fops, | |
916 | }; | |
917 | ||
918 | MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR); | |
919 | ||
920 | static int __init nvm_mod_init(void) | |
921 | { | |
922 | int ret; | |
923 | ||
924 | ret = misc_register(&_nvm_misc); | |
925 | if (ret) | |
926 | pr_err("nvm: misc_register failed for control device"); | |
927 | ||
928 | return ret; | |
929 | } | |
930 | ||
931 | static void __exit nvm_mod_exit(void) | |
932 | { | |
933 | misc_deregister(&_nvm_misc); | |
934 | } | |
935 | ||
936 | MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>"); | |
937 | MODULE_LICENSE("GPL v2"); | |
938 | MODULE_VERSION("0.1"); | |
939 | module_init(nvm_mod_init); | |
940 | module_exit(nvm_mod_exit); |