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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> | |
91276162 | 30 | #include <linux/sched/sysctl.h> |
cd9e9808 MB |
31 | #include <uapi/linux/lightnvm.h> |
32 | ||
33 | static LIST_HEAD(nvm_targets); | |
34 | static LIST_HEAD(nvm_mgrs); | |
35 | static LIST_HEAD(nvm_devices); | |
36 | static DECLARE_RWSEM(nvm_lock); | |
37 | ||
38 | static struct nvm_tgt_type *nvm_find_target_type(const char *name) | |
39 | { | |
40 | struct nvm_tgt_type *tt; | |
41 | ||
42 | list_for_each_entry(tt, &nvm_targets, list) | |
43 | if (!strcmp(name, tt->name)) | |
44 | return tt; | |
45 | ||
46 | return NULL; | |
47 | } | |
48 | ||
49 | int nvm_register_target(struct nvm_tgt_type *tt) | |
50 | { | |
51 | int ret = 0; | |
52 | ||
53 | down_write(&nvm_lock); | |
54 | if (nvm_find_target_type(tt->name)) | |
55 | ret = -EEXIST; | |
56 | else | |
57 | list_add(&tt->list, &nvm_targets); | |
58 | up_write(&nvm_lock); | |
59 | ||
60 | return ret; | |
61 | } | |
62 | EXPORT_SYMBOL(nvm_register_target); | |
63 | ||
64 | void nvm_unregister_target(struct nvm_tgt_type *tt) | |
65 | { | |
66 | if (!tt) | |
67 | return; | |
68 | ||
69 | down_write(&nvm_lock); | |
70 | list_del(&tt->list); | |
71 | up_write(&nvm_lock); | |
72 | } | |
73 | EXPORT_SYMBOL(nvm_unregister_target); | |
74 | ||
75 | void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, | |
76 | dma_addr_t *dma_handler) | |
77 | { | |
16f26c3a | 78 | return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags, |
cd9e9808 MB |
79 | dma_handler); |
80 | } | |
81 | EXPORT_SYMBOL(nvm_dev_dma_alloc); | |
82 | ||
83 | void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list, | |
84 | dma_addr_t dma_handler) | |
85 | { | |
86 | dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler); | |
87 | } | |
88 | EXPORT_SYMBOL(nvm_dev_dma_free); | |
89 | ||
90 | static struct nvmm_type *nvm_find_mgr_type(const char *name) | |
91 | { | |
92 | struct nvmm_type *mt; | |
93 | ||
94 | list_for_each_entry(mt, &nvm_mgrs, list) | |
95 | if (!strcmp(name, mt->name)) | |
96 | return mt; | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
762796bc MB |
101 | struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev) |
102 | { | |
103 | struct nvmm_type *mt; | |
104 | int ret; | |
105 | ||
106 | lockdep_assert_held(&nvm_lock); | |
107 | ||
108 | list_for_each_entry(mt, &nvm_mgrs, list) { | |
109 | ret = mt->register_mgr(dev); | |
110 | if (ret < 0) { | |
111 | pr_err("nvm: media mgr failed to init (%d) on dev %s\n", | |
112 | ret, dev->name); | |
113 | return NULL; /* initialization failed */ | |
114 | } else if (ret > 0) | |
115 | return mt; | |
116 | } | |
117 | ||
118 | return NULL; | |
119 | } | |
120 | ||
cd9e9808 MB |
121 | int nvm_register_mgr(struct nvmm_type *mt) |
122 | { | |
762796bc | 123 | struct nvm_dev *dev; |
cd9e9808 MB |
124 | int ret = 0; |
125 | ||
126 | down_write(&nvm_lock); | |
762796bc | 127 | if (nvm_find_mgr_type(mt->name)) { |
cd9e9808 | 128 | ret = -EEXIST; |
762796bc MB |
129 | goto finish; |
130 | } else { | |
cd9e9808 | 131 | list_add(&mt->list, &nvm_mgrs); |
762796bc MB |
132 | } |
133 | ||
134 | /* try to register media mgr if any device have none configured */ | |
135 | list_for_each_entry(dev, &nvm_devices, devices) { | |
136 | if (dev->mt) | |
137 | continue; | |
138 | ||
139 | dev->mt = nvm_init_mgr(dev); | |
140 | } | |
141 | finish: | |
cd9e9808 MB |
142 | up_write(&nvm_lock); |
143 | ||
144 | return ret; | |
145 | } | |
146 | EXPORT_SYMBOL(nvm_register_mgr); | |
147 | ||
148 | void nvm_unregister_mgr(struct nvmm_type *mt) | |
149 | { | |
150 | if (!mt) | |
151 | return; | |
152 | ||
153 | down_write(&nvm_lock); | |
154 | list_del(&mt->list); | |
155 | up_write(&nvm_lock); | |
156 | } | |
157 | EXPORT_SYMBOL(nvm_unregister_mgr); | |
158 | ||
159 | static struct nvm_dev *nvm_find_nvm_dev(const char *name) | |
160 | { | |
161 | struct nvm_dev *dev; | |
162 | ||
163 | list_for_each_entry(dev, &nvm_devices, devices) | |
164 | if (!strcmp(name, dev->name)) | |
165 | return dev; | |
166 | ||
167 | return NULL; | |
168 | } | |
169 | ||
170 | struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun, | |
171 | unsigned long flags) | |
172 | { | |
173 | return dev->mt->get_blk(dev, lun, flags); | |
174 | } | |
175 | EXPORT_SYMBOL(nvm_get_blk); | |
176 | ||
177 | /* Assumes that all valid pages have already been moved on release to bm */ | |
178 | void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
179 | { | |
180 | return dev->mt->put_blk(dev, blk); | |
181 | } | |
182 | EXPORT_SYMBOL(nvm_put_blk); | |
183 | ||
184 | int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) | |
185 | { | |
186 | return dev->mt->submit_io(dev, rqd); | |
187 | } | |
188 | EXPORT_SYMBOL(nvm_submit_io); | |
189 | ||
190 | int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
191 | { | |
192 | return dev->mt->erase_blk(dev, blk, 0); | |
193 | } | |
194 | EXPORT_SYMBOL(nvm_erase_blk); | |
195 | ||
069368e9 MB |
196 | void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd) |
197 | { | |
198 | int i; | |
199 | ||
200 | if (rqd->nr_pages > 1) { | |
201 | for (i = 0; i < rqd->nr_pages; i++) | |
202 | rqd->ppa_list[i] = dev_to_generic_addr(dev, | |
203 | rqd->ppa_list[i]); | |
204 | } else { | |
205 | rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr); | |
206 | } | |
207 | } | |
208 | EXPORT_SYMBOL(nvm_addr_to_generic_mode); | |
209 | ||
210 | void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd) | |
211 | { | |
212 | int i; | |
213 | ||
214 | if (rqd->nr_pages > 1) { | |
215 | for (i = 0; i < rqd->nr_pages; i++) | |
216 | rqd->ppa_list[i] = generic_to_dev_addr(dev, | |
217 | rqd->ppa_list[i]); | |
218 | } else { | |
219 | rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr); | |
220 | } | |
221 | } | |
222 | EXPORT_SYMBOL(nvm_generic_to_addr_mode); | |
223 | ||
abd805ec MB |
224 | int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd, |
225 | struct ppa_addr *ppas, int nr_ppas) | |
069368e9 | 226 | { |
abd805ec MB |
227 | int i, plane_cnt, pl_idx; |
228 | ||
229 | if (dev->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { | |
230 | rqd->nr_pages = 1; | |
231 | rqd->ppa_addr = ppas[0]; | |
069368e9 | 232 | |
069368e9 | 233 | return 0; |
abd805ec | 234 | } |
069368e9 | 235 | |
abd805ec MB |
236 | plane_cnt = (1 << dev->plane_mode); |
237 | rqd->nr_pages = plane_cnt * nr_ppas; | |
069368e9 | 238 | |
abd805ec MB |
239 | if (dev->ops->max_phys_sect < rqd->nr_pages) |
240 | return -EINVAL; | |
241 | ||
242 | rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); | |
243 | if (!rqd->ppa_list) { | |
244 | pr_err("nvm: failed to allocate dma memory\n"); | |
245 | return -ENOMEM; | |
246 | } | |
247 | ||
556755e9 MB |
248 | for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { |
249 | for (i = 0; i < nr_ppas; i++) { | |
abd805ec | 250 | ppas[i].g.pl = pl_idx; |
556755e9 | 251 | rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppas[i]; |
069368e9 MB |
252 | } |
253 | } | |
254 | ||
abd805ec MB |
255 | return 0; |
256 | } | |
257 | EXPORT_SYMBOL(nvm_set_rqd_ppalist); | |
258 | ||
259 | void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd) | |
260 | { | |
261 | if (!rqd->ppa_list) | |
262 | return; | |
263 | ||
264 | nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list); | |
265 | } | |
266 | EXPORT_SYMBOL(nvm_free_rqd_ppalist); | |
267 | ||
81e681d3 | 268 | int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas) |
abd805ec MB |
269 | { |
270 | struct nvm_rq rqd; | |
271 | int ret; | |
272 | ||
273 | if (!dev->ops->erase_block) | |
274 | return 0; | |
275 | ||
276 | memset(&rqd, 0, sizeof(struct nvm_rq)); | |
277 | ||
81e681d3 | 278 | ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas); |
abd805ec MB |
279 | if (ret) |
280 | return ret; | |
281 | ||
069368e9 MB |
282 | nvm_generic_to_addr_mode(dev, &rqd); |
283 | ||
284 | ret = dev->ops->erase_block(dev, &rqd); | |
285 | ||
abd805ec | 286 | nvm_free_rqd_ppalist(dev, &rqd); |
069368e9 MB |
287 | |
288 | return ret; | |
289 | } | |
290 | EXPORT_SYMBOL(nvm_erase_ppa); | |
291 | ||
91276162 MB |
292 | void nvm_end_io(struct nvm_rq *rqd, int error) |
293 | { | |
72d256ec MB |
294 | rqd->error = error; |
295 | rqd->end_io(rqd); | |
91276162 MB |
296 | } |
297 | EXPORT_SYMBOL(nvm_end_io); | |
298 | ||
299 | static void nvm_end_io_sync(struct nvm_rq *rqd, int errors) | |
300 | { | |
301 | struct completion *waiting = rqd->wait; | |
302 | ||
303 | rqd->wait = NULL; | |
304 | ||
305 | complete(waiting); | |
306 | } | |
307 | ||
cd9e9808 MB |
308 | static int nvm_core_init(struct nvm_dev *dev) |
309 | { | |
310 | struct nvm_id *id = &dev->identity; | |
311 | struct nvm_id_group *grp = &id->groups[0]; | |
312 | ||
313 | /* device values */ | |
314 | dev->nr_chnls = grp->num_ch; | |
315 | dev->luns_per_chnl = grp->num_lun; | |
316 | dev->pgs_per_blk = grp->num_pg; | |
317 | dev->blks_per_lun = grp->num_blk; | |
318 | dev->nr_planes = grp->num_pln; | |
319 | dev->sec_size = grp->csecs; | |
320 | dev->oob_size = grp->sos; | |
321 | dev->sec_per_pg = grp->fpg_sz / grp->csecs; | |
7386af27 | 322 | memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format)); |
cd9e9808 MB |
323 | |
324 | dev->plane_mode = NVM_PLANE_SINGLE; | |
325 | dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size; | |
326 | ||
4264c980 MB |
327 | if (grp->mtype != 0) { |
328 | pr_err("nvm: memory type not supported\n"); | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | if (grp->fmtype != 0 && grp->fmtype != 1) { | |
333 | pr_err("nvm: flash type not supported\n"); | |
334 | return -EINVAL; | |
335 | } | |
336 | ||
cd9e9808 MB |
337 | if (grp->mpos & 0x020202) |
338 | dev->plane_mode = NVM_PLANE_DOUBLE; | |
339 | if (grp->mpos & 0x040404) | |
340 | dev->plane_mode = NVM_PLANE_QUAD; | |
341 | ||
342 | /* calculated values */ | |
343 | dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes; | |
344 | dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk; | |
345 | dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun; | |
346 | dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls; | |
347 | ||
348 | dev->total_blocks = dev->nr_planes * | |
349 | dev->blks_per_lun * | |
350 | dev->luns_per_chnl * | |
351 | dev->nr_chnls; | |
352 | dev->total_pages = dev->total_blocks * dev->pgs_per_blk; | |
353 | INIT_LIST_HEAD(&dev->online_targets); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static void nvm_free(struct nvm_dev *dev) | |
359 | { | |
360 | if (!dev) | |
361 | return; | |
362 | ||
363 | if (dev->mt) | |
364 | dev->mt->unregister_mgr(dev); | |
cd9e9808 MB |
365 | } |
366 | ||
367 | static int nvm_init(struct nvm_dev *dev) | |
368 | { | |
480fc0db | 369 | int ret = -EINVAL; |
cd9e9808 MB |
370 | |
371 | if (!dev->q || !dev->ops) | |
480fc0db | 372 | return ret; |
cd9e9808 | 373 | |
16f26c3a | 374 | if (dev->ops->identity(dev, &dev->identity)) { |
cd9e9808 | 375 | pr_err("nvm: device could not be identified\n"); |
cd9e9808 MB |
376 | goto err; |
377 | } | |
378 | ||
379 | pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n", | |
380 | dev->identity.ver_id, dev->identity.vmnt, | |
381 | dev->identity.cgrps); | |
382 | ||
383 | if (dev->identity.ver_id != 1) { | |
384 | pr_err("nvm: device not supported by kernel."); | |
385 | goto err; | |
386 | } | |
387 | ||
388 | if (dev->identity.cgrps != 1) { | |
389 | pr_err("nvm: only one group configuration supported."); | |
390 | goto err; | |
391 | } | |
392 | ||
393 | ret = nvm_core_init(dev); | |
394 | if (ret) { | |
395 | pr_err("nvm: could not initialize core structures.\n"); | |
396 | goto err; | |
397 | } | |
398 | ||
cd9e9808 MB |
399 | pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n", |
400 | dev->name, dev->sec_per_pg, dev->nr_planes, | |
401 | dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns, | |
402 | dev->nr_chnls); | |
403 | return 0; | |
404 | err: | |
cd9e9808 MB |
405 | pr_err("nvm: failed to initialize nvm\n"); |
406 | return ret; | |
407 | } | |
408 | ||
409 | static void nvm_exit(struct nvm_dev *dev) | |
410 | { | |
411 | if (dev->ppalist_pool) | |
412 | dev->ops->destroy_dma_pool(dev->ppalist_pool); | |
413 | nvm_free(dev); | |
414 | ||
415 | pr_info("nvm: successfully unloaded\n"); | |
416 | } | |
417 | ||
418 | int nvm_register(struct request_queue *q, char *disk_name, | |
419 | struct nvm_dev_ops *ops) | |
420 | { | |
421 | struct nvm_dev *dev; | |
422 | int ret; | |
423 | ||
424 | if (!ops->identity) | |
425 | return -EINVAL; | |
426 | ||
427 | dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL); | |
428 | if (!dev) | |
429 | return -ENOMEM; | |
430 | ||
431 | dev->q = q; | |
432 | dev->ops = ops; | |
433 | strncpy(dev->name, disk_name, DISK_NAME_LEN); | |
434 | ||
435 | ret = nvm_init(dev); | |
436 | if (ret) | |
437 | goto err_init; | |
438 | ||
d160147b WT |
439 | if (dev->ops->max_phys_sect > 256) { |
440 | pr_info("nvm: max sectors supported is 256.\n"); | |
441 | ret = -EINVAL; | |
442 | goto err_init; | |
443 | } | |
444 | ||
cd9e9808 | 445 | if (dev->ops->max_phys_sect > 1) { |
16f26c3a | 446 | dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist"); |
cd9e9808 MB |
447 | if (!dev->ppalist_pool) { |
448 | pr_err("nvm: could not create ppa pool\n"); | |
93e70c1f MB |
449 | ret = -ENOMEM; |
450 | goto err_init; | |
cd9e9808 | 451 | } |
cd9e9808 MB |
452 | } |
453 | ||
762796bc | 454 | /* register device with a supported media manager */ |
edad2e66 | 455 | down_write(&nvm_lock); |
762796bc | 456 | dev->mt = nvm_init_mgr(dev); |
edad2e66 MB |
457 | list_add(&dev->devices, &nvm_devices); |
458 | up_write(&nvm_lock); | |
459 | ||
cd9e9808 MB |
460 | return 0; |
461 | err_init: | |
462 | kfree(dev); | |
463 | return ret; | |
464 | } | |
465 | EXPORT_SYMBOL(nvm_register); | |
466 | ||
467 | void nvm_unregister(char *disk_name) | |
468 | { | |
d0a712ce | 469 | struct nvm_dev *dev; |
cd9e9808 | 470 | |
d0a712ce WT |
471 | down_write(&nvm_lock); |
472 | dev = nvm_find_nvm_dev(disk_name); | |
cd9e9808 MB |
473 | if (!dev) { |
474 | pr_err("nvm: could not find device %s to unregister\n", | |
475 | disk_name); | |
d0a712ce | 476 | up_write(&nvm_lock); |
cd9e9808 MB |
477 | return; |
478 | } | |
479 | ||
cd9e9808 MB |
480 | list_del(&dev->devices); |
481 | up_write(&nvm_lock); | |
c1480ad5 MB |
482 | |
483 | nvm_exit(dev); | |
484 | kfree(dev); | |
cd9e9808 MB |
485 | } |
486 | EXPORT_SYMBOL(nvm_unregister); | |
487 | ||
488 | static const struct block_device_operations nvm_fops = { | |
489 | .owner = THIS_MODULE, | |
490 | }; | |
491 | ||
492 | static int nvm_create_target(struct nvm_dev *dev, | |
493 | struct nvm_ioctl_create *create) | |
494 | { | |
495 | struct nvm_ioctl_create_simple *s = &create->conf.s; | |
496 | struct request_queue *tqueue; | |
cd9e9808 MB |
497 | struct gendisk *tdisk; |
498 | struct nvm_tgt_type *tt; | |
499 | struct nvm_target *t; | |
500 | void *targetdata; | |
cd9e9808 MB |
501 | |
502 | if (!dev->mt) { | |
762796bc MB |
503 | pr_info("nvm: device has no media manager registered.\n"); |
504 | return -ENODEV; | |
cd9e9808 MB |
505 | } |
506 | ||
762796bc | 507 | down_write(&nvm_lock); |
cd9e9808 MB |
508 | tt = nvm_find_target_type(create->tgttype); |
509 | if (!tt) { | |
510 | pr_err("nvm: target type %s not found\n", create->tgttype); | |
d0a712ce | 511 | up_write(&nvm_lock); |
cd9e9808 MB |
512 | return -EINVAL; |
513 | } | |
514 | ||
cd9e9808 MB |
515 | list_for_each_entry(t, &dev->online_targets, list) { |
516 | if (!strcmp(create->tgtname, t->disk->disk_name)) { | |
517 | pr_err("nvm: target name already exists.\n"); | |
518 | up_write(&nvm_lock); | |
519 | return -EINVAL; | |
520 | } | |
521 | } | |
522 | up_write(&nvm_lock); | |
523 | ||
524 | t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); | |
525 | if (!t) | |
526 | return -ENOMEM; | |
527 | ||
528 | tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); | |
529 | if (!tqueue) | |
530 | goto err_t; | |
531 | blk_queue_make_request(tqueue, tt->make_rq); | |
532 | ||
533 | tdisk = alloc_disk(0); | |
534 | if (!tdisk) | |
535 | goto err_queue; | |
536 | ||
537 | sprintf(tdisk->disk_name, "%s", create->tgtname); | |
538 | tdisk->flags = GENHD_FL_EXT_DEVT; | |
539 | tdisk->major = 0; | |
540 | tdisk->first_minor = 0; | |
541 | tdisk->fops = &nvm_fops; | |
542 | tdisk->queue = tqueue; | |
543 | ||
544 | targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end); | |
545 | if (IS_ERR(targetdata)) | |
546 | goto err_init; | |
547 | ||
548 | tdisk->private_data = targetdata; | |
549 | tqueue->queuedata = targetdata; | |
550 | ||
551 | blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect); | |
552 | ||
553 | set_capacity(tdisk, tt->capacity(targetdata)); | |
554 | add_disk(tdisk); | |
555 | ||
556 | t->type = tt; | |
557 | t->disk = tdisk; | |
558 | ||
559 | down_write(&nvm_lock); | |
560 | list_add_tail(&t->list, &dev->online_targets); | |
561 | up_write(&nvm_lock); | |
562 | ||
563 | return 0; | |
564 | err_init: | |
565 | put_disk(tdisk); | |
566 | err_queue: | |
567 | blk_cleanup_queue(tqueue); | |
568 | err_t: | |
569 | kfree(t); | |
570 | return -ENOMEM; | |
571 | } | |
572 | ||
573 | static void nvm_remove_target(struct nvm_target *t) | |
574 | { | |
575 | struct nvm_tgt_type *tt = t->type; | |
576 | struct gendisk *tdisk = t->disk; | |
577 | struct request_queue *q = tdisk->queue; | |
578 | ||
579 | lockdep_assert_held(&nvm_lock); | |
580 | ||
581 | del_gendisk(tdisk); | |
d09f9581 JG |
582 | blk_cleanup_queue(q); |
583 | ||
cd9e9808 MB |
584 | if (tt->exit) |
585 | tt->exit(tdisk->private_data); | |
586 | ||
cd9e9808 MB |
587 | put_disk(tdisk); |
588 | ||
589 | list_del(&t->list); | |
590 | kfree(t); | |
591 | } | |
592 | ||
593 | static int __nvm_configure_create(struct nvm_ioctl_create *create) | |
594 | { | |
595 | struct nvm_dev *dev; | |
596 | struct nvm_ioctl_create_simple *s; | |
597 | ||
d0a712ce | 598 | down_write(&nvm_lock); |
cd9e9808 | 599 | dev = nvm_find_nvm_dev(create->dev); |
d0a712ce | 600 | up_write(&nvm_lock); |
cd9e9808 MB |
601 | if (!dev) { |
602 | pr_err("nvm: device not found\n"); | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
606 | if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) { | |
607 | pr_err("nvm: config type not valid\n"); | |
608 | return -EINVAL; | |
609 | } | |
610 | s = &create->conf.s; | |
611 | ||
612 | if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) { | |
613 | pr_err("nvm: lun out of bound (%u:%u > %u)\n", | |
614 | s->lun_begin, s->lun_end, dev->nr_luns); | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
618 | return nvm_create_target(dev, create); | |
619 | } | |
620 | ||
621 | static int __nvm_configure_remove(struct nvm_ioctl_remove *remove) | |
622 | { | |
623 | struct nvm_target *t = NULL; | |
624 | struct nvm_dev *dev; | |
625 | int ret = -1; | |
626 | ||
627 | down_write(&nvm_lock); | |
628 | list_for_each_entry(dev, &nvm_devices, devices) | |
629 | list_for_each_entry(t, &dev->online_targets, list) { | |
630 | if (!strcmp(remove->tgtname, t->disk->disk_name)) { | |
631 | nvm_remove_target(t); | |
632 | ret = 0; | |
633 | break; | |
634 | } | |
635 | } | |
636 | up_write(&nvm_lock); | |
637 | ||
638 | if (ret) { | |
639 | pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname); | |
640 | return -EINVAL; | |
641 | } | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | #ifdef CONFIG_NVM_DEBUG | |
647 | static int nvm_configure_show(const char *val) | |
648 | { | |
649 | struct nvm_dev *dev; | |
650 | char opcode, devname[DISK_NAME_LEN]; | |
651 | int ret; | |
652 | ||
653 | ret = sscanf(val, "%c %32s", &opcode, devname); | |
654 | if (ret != 2) { | |
655 | pr_err("nvm: invalid command. Use \"opcode devicename\".\n"); | |
656 | return -EINVAL; | |
657 | } | |
658 | ||
d0a712ce | 659 | down_write(&nvm_lock); |
cd9e9808 | 660 | dev = nvm_find_nvm_dev(devname); |
d0a712ce | 661 | up_write(&nvm_lock); |
cd9e9808 MB |
662 | if (!dev) { |
663 | pr_err("nvm: device not found\n"); | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | if (!dev->mt) | |
668 | return 0; | |
669 | ||
2fde0e48 | 670 | dev->mt->lun_info_print(dev); |
cd9e9808 MB |
671 | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static int nvm_configure_remove(const char *val) | |
676 | { | |
677 | struct nvm_ioctl_remove remove; | |
678 | char opcode; | |
679 | int ret; | |
680 | ||
681 | ret = sscanf(val, "%c %256s", &opcode, remove.tgtname); | |
682 | if (ret != 2) { | |
683 | pr_err("nvm: invalid command. Use \"d targetname\".\n"); | |
684 | return -EINVAL; | |
685 | } | |
686 | ||
687 | remove.flags = 0; | |
688 | ||
689 | return __nvm_configure_remove(&remove); | |
690 | } | |
691 | ||
692 | static int nvm_configure_create(const char *val) | |
693 | { | |
694 | struct nvm_ioctl_create create; | |
695 | char opcode; | |
696 | int lun_begin, lun_end, ret; | |
697 | ||
698 | ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev, | |
699 | create.tgtname, create.tgttype, | |
700 | &lun_begin, &lun_end); | |
701 | if (ret != 6) { | |
702 | pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n"); | |
703 | return -EINVAL; | |
704 | } | |
705 | ||
706 | create.flags = 0; | |
707 | create.conf.type = NVM_CONFIG_TYPE_SIMPLE; | |
708 | create.conf.s.lun_begin = lun_begin; | |
709 | create.conf.s.lun_end = lun_end; | |
710 | ||
711 | return __nvm_configure_create(&create); | |
712 | } | |
713 | ||
714 | ||
715 | /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */ | |
716 | static int nvm_configure_by_str_event(const char *val, | |
717 | const struct kernel_param *kp) | |
718 | { | |
719 | char opcode; | |
720 | int ret; | |
721 | ||
722 | ret = sscanf(val, "%c", &opcode); | |
723 | if (ret != 1) { | |
724 | pr_err("nvm: string must have the format of \"cmd ...\"\n"); | |
725 | return -EINVAL; | |
726 | } | |
727 | ||
728 | switch (opcode) { | |
729 | case 'a': | |
730 | return nvm_configure_create(val); | |
731 | case 'd': | |
732 | return nvm_configure_remove(val); | |
733 | case 's': | |
734 | return nvm_configure_show(val); | |
735 | default: | |
736 | pr_err("nvm: invalid command\n"); | |
737 | return -EINVAL; | |
738 | } | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | static int nvm_configure_get(char *buf, const struct kernel_param *kp) | |
744 | { | |
745 | int sz = 0; | |
746 | char *buf_start = buf; | |
747 | struct nvm_dev *dev; | |
748 | ||
749 | buf += sprintf(buf, "available devices:\n"); | |
750 | down_write(&nvm_lock); | |
751 | list_for_each_entry(dev, &nvm_devices, devices) { | |
752 | if (sz > 4095 - DISK_NAME_LEN) | |
753 | break; | |
754 | buf += sprintf(buf, " %32s\n", dev->name); | |
755 | } | |
756 | up_write(&nvm_lock); | |
757 | ||
758 | return buf - buf_start - 1; | |
759 | } | |
760 | ||
761 | static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = { | |
762 | .set = nvm_configure_by_str_event, | |
763 | .get = nvm_configure_get, | |
764 | }; | |
765 | ||
766 | #undef MODULE_PARAM_PREFIX | |
767 | #define MODULE_PARAM_PREFIX "lnvm." | |
768 | ||
769 | module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL, | |
770 | 0644); | |
771 | ||
772 | #endif /* CONFIG_NVM_DEBUG */ | |
773 | ||
774 | static long nvm_ioctl_info(struct file *file, void __user *arg) | |
775 | { | |
776 | struct nvm_ioctl_info *info; | |
777 | struct nvm_tgt_type *tt; | |
778 | int tgt_iter = 0; | |
779 | ||
780 | if (!capable(CAP_SYS_ADMIN)) | |
781 | return -EPERM; | |
782 | ||
783 | info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); | |
784 | if (IS_ERR(info)) | |
785 | return -EFAULT; | |
786 | ||
787 | info->version[0] = NVM_VERSION_MAJOR; | |
788 | info->version[1] = NVM_VERSION_MINOR; | |
789 | info->version[2] = NVM_VERSION_PATCH; | |
790 | ||
791 | down_write(&nvm_lock); | |
792 | list_for_each_entry(tt, &nvm_targets, list) { | |
793 | struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; | |
794 | ||
795 | tgt->version[0] = tt->version[0]; | |
796 | tgt->version[1] = tt->version[1]; | |
797 | tgt->version[2] = tt->version[2]; | |
798 | strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); | |
799 | ||
800 | tgt_iter++; | |
801 | } | |
802 | ||
803 | info->tgtsize = tgt_iter; | |
804 | up_write(&nvm_lock); | |
805 | ||
76e25081 SM |
806 | if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { |
807 | kfree(info); | |
cd9e9808 | 808 | return -EFAULT; |
76e25081 | 809 | } |
cd9e9808 MB |
810 | |
811 | kfree(info); | |
812 | return 0; | |
813 | } | |
814 | ||
815 | static long nvm_ioctl_get_devices(struct file *file, void __user *arg) | |
816 | { | |
817 | struct nvm_ioctl_get_devices *devices; | |
818 | struct nvm_dev *dev; | |
819 | int i = 0; | |
820 | ||
821 | if (!capable(CAP_SYS_ADMIN)) | |
822 | return -EPERM; | |
823 | ||
824 | devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); | |
825 | if (!devices) | |
826 | return -ENOMEM; | |
827 | ||
828 | down_write(&nvm_lock); | |
829 | list_for_each_entry(dev, &nvm_devices, devices) { | |
830 | struct nvm_ioctl_device_info *info = &devices->info[i]; | |
831 | ||
832 | sprintf(info->devname, "%s", dev->name); | |
833 | if (dev->mt) { | |
834 | info->bmversion[0] = dev->mt->version[0]; | |
835 | info->bmversion[1] = dev->mt->version[1]; | |
836 | info->bmversion[2] = dev->mt->version[2]; | |
837 | sprintf(info->bmname, "%s", dev->mt->name); | |
838 | } else { | |
839 | sprintf(info->bmname, "none"); | |
840 | } | |
841 | ||
842 | i++; | |
843 | if (i > 31) { | |
844 | pr_err("nvm: max 31 devices can be reported.\n"); | |
845 | break; | |
846 | } | |
847 | } | |
848 | up_write(&nvm_lock); | |
849 | ||
850 | devices->nr_devices = i; | |
851 | ||
76e25081 SM |
852 | if (copy_to_user(arg, devices, |
853 | sizeof(struct nvm_ioctl_get_devices))) { | |
854 | kfree(devices); | |
cd9e9808 | 855 | return -EFAULT; |
76e25081 | 856 | } |
cd9e9808 MB |
857 | |
858 | kfree(devices); | |
859 | return 0; | |
860 | } | |
861 | ||
862 | static long nvm_ioctl_dev_create(struct file *file, void __user *arg) | |
863 | { | |
864 | struct nvm_ioctl_create create; | |
865 | ||
866 | if (!capable(CAP_SYS_ADMIN)) | |
867 | return -EPERM; | |
868 | ||
869 | if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) | |
870 | return -EFAULT; | |
871 | ||
872 | create.dev[DISK_NAME_LEN - 1] = '\0'; | |
873 | create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; | |
874 | create.tgtname[DISK_NAME_LEN - 1] = '\0'; | |
875 | ||
876 | if (create.flags != 0) { | |
877 | pr_err("nvm: no flags supported\n"); | |
878 | return -EINVAL; | |
879 | } | |
880 | ||
881 | return __nvm_configure_create(&create); | |
882 | } | |
883 | ||
884 | static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) | |
885 | { | |
886 | struct nvm_ioctl_remove remove; | |
887 | ||
888 | if (!capable(CAP_SYS_ADMIN)) | |
889 | return -EPERM; | |
890 | ||
891 | if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) | |
892 | return -EFAULT; | |
893 | ||
894 | remove.tgtname[DISK_NAME_LEN - 1] = '\0'; | |
895 | ||
896 | if (remove.flags != 0) { | |
897 | pr_err("nvm: no flags supported\n"); | |
898 | return -EINVAL; | |
899 | } | |
900 | ||
901 | return __nvm_configure_remove(&remove); | |
902 | } | |
903 | ||
904 | static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) | |
905 | { | |
906 | void __user *argp = (void __user *)arg; | |
907 | ||
908 | switch (cmd) { | |
909 | case NVM_INFO: | |
910 | return nvm_ioctl_info(file, argp); | |
911 | case NVM_GET_DEVICES: | |
912 | return nvm_ioctl_get_devices(file, argp); | |
913 | case NVM_DEV_CREATE: | |
914 | return nvm_ioctl_dev_create(file, argp); | |
915 | case NVM_DEV_REMOVE: | |
916 | return nvm_ioctl_dev_remove(file, argp); | |
917 | } | |
918 | return 0; | |
919 | } | |
920 | ||
921 | static const struct file_operations _ctl_fops = { | |
922 | .open = nonseekable_open, | |
923 | .unlocked_ioctl = nvm_ctl_ioctl, | |
924 | .owner = THIS_MODULE, | |
925 | .llseek = noop_llseek, | |
926 | }; | |
927 | ||
928 | static struct miscdevice _nvm_misc = { | |
929 | .minor = MISC_DYNAMIC_MINOR, | |
930 | .name = "lightnvm", | |
931 | .nodename = "lightnvm/control", | |
932 | .fops = &_ctl_fops, | |
933 | }; | |
934 | ||
935 | MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR); | |
936 | ||
937 | static int __init nvm_mod_init(void) | |
938 | { | |
939 | int ret; | |
940 | ||
941 | ret = misc_register(&_nvm_misc); | |
942 | if (ret) | |
943 | pr_err("nvm: misc_register failed for control device"); | |
944 | ||
945 | return ret; | |
946 | } | |
947 | ||
948 | static void __exit nvm_mod_exit(void) | |
949 | { | |
950 | misc_deregister(&_nvm_misc); | |
951 | } | |
952 | ||
953 | MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>"); | |
954 | MODULE_LICENSE("GPL v2"); | |
955 | MODULE_VERSION("0.1"); | |
956 | module_init(nvm_mod_init); | |
957 | module_exit(nvm_mod_exit); |