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