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
nvm_find_target_type(const char * name)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
nvm_register_target(struct nvm_tgt_type * tt)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
nvm_unregister_target(struct nvm_tgt_type * tt)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
nvm_dev_dma_alloc(struct nvm_dev * dev,gfp_t mem_flags,dma_addr_t * dma_handler)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, dev->ppalist_pool, mem_flags,
78 dma_handler);
79 }
80 EXPORT_SYMBOL(nvm_dev_dma_alloc);
81
nvm_dev_dma_free(struct nvm_dev * dev,void * ppa_list,dma_addr_t dma_handler)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
nvm_find_mgr_type(const char * name)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
nvm_init_mgr(struct nvm_dev * dev)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
nvm_register_mgr(struct nvmm_type * mt)120 int nvm_register_mgr(struct nvmm_type *mt)
121 {
122 struct nvm_dev *dev;
123 int ret = 0;
124
125 down_write(&nvm_lock);
126 if (nvm_find_mgr_type(mt->name)) {
127 ret = -EEXIST;
128 goto finish;
129 } else {
130 list_add(&mt->list, &nvm_mgrs);
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:
141 up_write(&nvm_lock);
142
143 return ret;
144 }
145 EXPORT_SYMBOL(nvm_register_mgr);
146
nvm_unregister_mgr(struct nvmm_type * mt)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
nvm_find_nvm_dev(const char * name)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
nvm_get_blk(struct nvm_dev * dev,struct nvm_lun * lun,unsigned long flags)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 */
nvm_put_blk(struct nvm_dev * dev,struct nvm_block * blk)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
nvm_submit_io(struct nvm_dev * dev,struct nvm_rq * rqd)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
nvm_erase_blk(struct nvm_dev * dev,struct nvm_block * blk)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
nvm_core_init(struct nvm_dev * dev)195 static int nvm_core_init(struct nvm_dev *dev)
196 {
197 struct nvm_id *id = &dev->identity;
198 struct nvm_id_group *grp = &id->groups[0];
199
200 /* device values */
201 dev->nr_chnls = grp->num_ch;
202 dev->luns_per_chnl = grp->num_lun;
203 dev->pgs_per_blk = grp->num_pg;
204 dev->blks_per_lun = grp->num_blk;
205 dev->nr_planes = grp->num_pln;
206 dev->sec_size = grp->csecs;
207 dev->oob_size = grp->sos;
208 dev->sec_per_pg = grp->fpg_sz / grp->csecs;
209 memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
210
211 dev->plane_mode = NVM_PLANE_SINGLE;
212 dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
213
214 if (grp->mtype != 0) {
215 pr_err("nvm: memory type not supported\n");
216 return -EINVAL;
217 }
218
219 if (grp->fmtype != 0 && grp->fmtype != 1) {
220 pr_err("nvm: flash type not supported\n");
221 return -EINVAL;
222 }
223
224 if (grp->mpos & 0x020202)
225 dev->plane_mode = NVM_PLANE_DOUBLE;
226 if (grp->mpos & 0x040404)
227 dev->plane_mode = NVM_PLANE_QUAD;
228
229 /* calculated values */
230 dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
231 dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
232 dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
233 dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
234
235 dev->total_blocks = dev->nr_planes *
236 dev->blks_per_lun *
237 dev->luns_per_chnl *
238 dev->nr_chnls;
239 dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
240 INIT_LIST_HEAD(&dev->online_targets);
241
242 return 0;
243 }
244
nvm_free(struct nvm_dev * dev)245 static void nvm_free(struct nvm_dev *dev)
246 {
247 if (!dev)
248 return;
249
250 if (dev->mt)
251 dev->mt->unregister_mgr(dev);
252 }
253
nvm_init(struct nvm_dev * dev)254 static int nvm_init(struct nvm_dev *dev)
255 {
256 int ret = -EINVAL;
257
258 if (!dev->q || !dev->ops)
259 return ret;
260
261 if (dev->ops->identity(dev, &dev->identity)) {
262 pr_err("nvm: device could not be identified\n");
263 goto err;
264 }
265
266 pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
267 dev->identity.ver_id, dev->identity.vmnt,
268 dev->identity.cgrps);
269
270 if (dev->identity.ver_id != 1) {
271 pr_err("nvm: device not supported by kernel.");
272 goto err;
273 }
274
275 if (dev->identity.cgrps != 1) {
276 pr_err("nvm: only one group configuration supported.");
277 goto err;
278 }
279
280 ret = nvm_core_init(dev);
281 if (ret) {
282 pr_err("nvm: could not initialize core structures.\n");
283 goto err;
284 }
285
286 pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
287 dev->name, dev->sec_per_pg, dev->nr_planes,
288 dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
289 dev->nr_chnls);
290 return 0;
291 err:
292 pr_err("nvm: failed to initialize nvm\n");
293 return ret;
294 }
295
nvm_exit(struct nvm_dev * dev)296 static void nvm_exit(struct nvm_dev *dev)
297 {
298 if (dev->ppalist_pool)
299 dev->ops->destroy_dma_pool(dev->ppalist_pool);
300 nvm_free(dev);
301
302 pr_info("nvm: successfully unloaded\n");
303 }
304
nvm_register(struct request_queue * q,char * disk_name,struct nvm_dev_ops * ops)305 int nvm_register(struct request_queue *q, char *disk_name,
306 struct nvm_dev_ops *ops)
307 {
308 struct nvm_dev *dev;
309 int ret;
310
311 if (!ops->identity)
312 return -EINVAL;
313
314 dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
315 if (!dev)
316 return -ENOMEM;
317
318 dev->q = q;
319 dev->ops = ops;
320 strncpy(dev->name, disk_name, DISK_NAME_LEN);
321
322 ret = nvm_init(dev);
323 if (ret)
324 goto err_init;
325
326 if (dev->ops->max_phys_sect > 256) {
327 pr_info("nvm: max sectors supported is 256.\n");
328 ret = -EINVAL;
329 goto err_init;
330 }
331
332 if (dev->ops->max_phys_sect > 1) {
333 dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist");
334 if (!dev->ppalist_pool) {
335 pr_err("nvm: could not create ppa pool\n");
336 ret = -ENOMEM;
337 goto err_init;
338 }
339 }
340
341 /* register device with a supported media manager */
342 down_write(&nvm_lock);
343 dev->mt = nvm_init_mgr(dev);
344 list_add(&dev->devices, &nvm_devices);
345 up_write(&nvm_lock);
346
347 return 0;
348 err_init:
349 kfree(dev);
350 return ret;
351 }
352 EXPORT_SYMBOL(nvm_register);
353
nvm_unregister(char * disk_name)354 void nvm_unregister(char *disk_name)
355 {
356 struct nvm_dev *dev;
357
358 down_write(&nvm_lock);
359 dev = nvm_find_nvm_dev(disk_name);
360 if (!dev) {
361 pr_err("nvm: could not find device %s to unregister\n",
362 disk_name);
363 up_write(&nvm_lock);
364 return;
365 }
366
367 list_del(&dev->devices);
368 up_write(&nvm_lock);
369
370 nvm_exit(dev);
371 kfree(dev);
372 }
373 EXPORT_SYMBOL(nvm_unregister);
374
375 static const struct block_device_operations nvm_fops = {
376 .owner = THIS_MODULE,
377 };
378
nvm_create_target(struct nvm_dev * dev,struct nvm_ioctl_create * create)379 static int nvm_create_target(struct nvm_dev *dev,
380 struct nvm_ioctl_create *create)
381 {
382 struct nvm_ioctl_create_simple *s = &create->conf.s;
383 struct request_queue *tqueue;
384 struct gendisk *tdisk;
385 struct nvm_tgt_type *tt;
386 struct nvm_target *t;
387 void *targetdata;
388
389 if (!dev->mt) {
390 pr_info("nvm: device has no media manager registered.\n");
391 return -ENODEV;
392 }
393
394 down_write(&nvm_lock);
395 tt = nvm_find_target_type(create->tgttype);
396 if (!tt) {
397 pr_err("nvm: target type %s not found\n", create->tgttype);
398 up_write(&nvm_lock);
399 return -EINVAL;
400 }
401
402 list_for_each_entry(t, &dev->online_targets, list) {
403 if (!strcmp(create->tgtname, t->disk->disk_name)) {
404 pr_err("nvm: target name already exists.\n");
405 up_write(&nvm_lock);
406 return -EINVAL;
407 }
408 }
409 up_write(&nvm_lock);
410
411 t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
412 if (!t)
413 return -ENOMEM;
414
415 tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
416 if (!tqueue)
417 goto err_t;
418 blk_queue_make_request(tqueue, tt->make_rq);
419
420 tdisk = alloc_disk(0);
421 if (!tdisk)
422 goto err_queue;
423
424 sprintf(tdisk->disk_name, "%s", create->tgtname);
425 tdisk->flags = GENHD_FL_EXT_DEVT;
426 tdisk->major = 0;
427 tdisk->first_minor = 0;
428 tdisk->fops = &nvm_fops;
429 tdisk->queue = tqueue;
430
431 targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
432 if (IS_ERR(targetdata))
433 goto err_init;
434
435 tdisk->private_data = targetdata;
436 tqueue->queuedata = targetdata;
437
438 blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
439
440 set_capacity(tdisk, tt->capacity(targetdata));
441 add_disk(tdisk);
442
443 t->type = tt;
444 t->disk = tdisk;
445
446 down_write(&nvm_lock);
447 list_add_tail(&t->list, &dev->online_targets);
448 up_write(&nvm_lock);
449
450 return 0;
451 err_init:
452 put_disk(tdisk);
453 err_queue:
454 blk_cleanup_queue(tqueue);
455 err_t:
456 kfree(t);
457 return -ENOMEM;
458 }
459
nvm_remove_target(struct nvm_target * t)460 static void nvm_remove_target(struct nvm_target *t)
461 {
462 struct nvm_tgt_type *tt = t->type;
463 struct gendisk *tdisk = t->disk;
464 struct request_queue *q = tdisk->queue;
465
466 lockdep_assert_held(&nvm_lock);
467
468 del_gendisk(tdisk);
469 blk_cleanup_queue(q);
470
471 if (tt->exit)
472 tt->exit(tdisk->private_data);
473
474 put_disk(tdisk);
475
476 list_del(&t->list);
477 kfree(t);
478 }
479
__nvm_configure_create(struct nvm_ioctl_create * create)480 static int __nvm_configure_create(struct nvm_ioctl_create *create)
481 {
482 struct nvm_dev *dev;
483 struct nvm_ioctl_create_simple *s;
484
485 down_write(&nvm_lock);
486 dev = nvm_find_nvm_dev(create->dev);
487 up_write(&nvm_lock);
488 if (!dev) {
489 pr_err("nvm: device not found\n");
490 return -EINVAL;
491 }
492
493 if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
494 pr_err("nvm: config type not valid\n");
495 return -EINVAL;
496 }
497 s = &create->conf.s;
498
499 if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
500 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
501 s->lun_begin, s->lun_end, dev->nr_luns);
502 return -EINVAL;
503 }
504
505 return nvm_create_target(dev, create);
506 }
507
__nvm_configure_remove(struct nvm_ioctl_remove * remove)508 static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
509 {
510 struct nvm_target *t = NULL;
511 struct nvm_dev *dev;
512 int ret = -1;
513
514 down_write(&nvm_lock);
515 list_for_each_entry(dev, &nvm_devices, devices)
516 list_for_each_entry(t, &dev->online_targets, list) {
517 if (!strcmp(remove->tgtname, t->disk->disk_name)) {
518 nvm_remove_target(t);
519 ret = 0;
520 break;
521 }
522 }
523 up_write(&nvm_lock);
524
525 if (ret) {
526 pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
527 return -EINVAL;
528 }
529
530 return 0;
531 }
532
533 #ifdef CONFIG_NVM_DEBUG
nvm_configure_show(const char * val)534 static int nvm_configure_show(const char *val)
535 {
536 struct nvm_dev *dev;
537 char opcode, devname[DISK_NAME_LEN];
538 int ret;
539
540 ret = sscanf(val, "%c %32s", &opcode, devname);
541 if (ret != 2) {
542 pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
543 return -EINVAL;
544 }
545
546 down_write(&nvm_lock);
547 dev = nvm_find_nvm_dev(devname);
548 up_write(&nvm_lock);
549 if (!dev) {
550 pr_err("nvm: device not found\n");
551 return -EINVAL;
552 }
553
554 if (!dev->mt)
555 return 0;
556
557 dev->mt->lun_info_print(dev);
558
559 return 0;
560 }
561
nvm_configure_remove(const char * val)562 static int nvm_configure_remove(const char *val)
563 {
564 struct nvm_ioctl_remove remove;
565 char opcode;
566 int ret;
567
568 ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
569 if (ret != 2) {
570 pr_err("nvm: invalid command. Use \"d targetname\".\n");
571 return -EINVAL;
572 }
573
574 remove.flags = 0;
575
576 return __nvm_configure_remove(&remove);
577 }
578
nvm_configure_create(const char * val)579 static int nvm_configure_create(const char *val)
580 {
581 struct nvm_ioctl_create create;
582 char opcode;
583 int lun_begin, lun_end, ret;
584
585 ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
586 create.tgtname, create.tgttype,
587 &lun_begin, &lun_end);
588 if (ret != 6) {
589 pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
590 return -EINVAL;
591 }
592
593 create.flags = 0;
594 create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
595 create.conf.s.lun_begin = lun_begin;
596 create.conf.s.lun_end = lun_end;
597
598 return __nvm_configure_create(&create);
599 }
600
601
602 /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
nvm_configure_by_str_event(const char * val,const struct kernel_param * kp)603 static int nvm_configure_by_str_event(const char *val,
604 const struct kernel_param *kp)
605 {
606 char opcode;
607 int ret;
608
609 ret = sscanf(val, "%c", &opcode);
610 if (ret != 1) {
611 pr_err("nvm: string must have the format of \"cmd ...\"\n");
612 return -EINVAL;
613 }
614
615 switch (opcode) {
616 case 'a':
617 return nvm_configure_create(val);
618 case 'd':
619 return nvm_configure_remove(val);
620 case 's':
621 return nvm_configure_show(val);
622 default:
623 pr_err("nvm: invalid command\n");
624 return -EINVAL;
625 }
626
627 return 0;
628 }
629
nvm_configure_get(char * buf,const struct kernel_param * kp)630 static int nvm_configure_get(char *buf, const struct kernel_param *kp)
631 {
632 int sz = 0;
633 char *buf_start = buf;
634 struct nvm_dev *dev;
635
636 buf += sprintf(buf, "available devices:\n");
637 down_write(&nvm_lock);
638 list_for_each_entry(dev, &nvm_devices, devices) {
639 if (sz > 4095 - DISK_NAME_LEN)
640 break;
641 buf += sprintf(buf, " %32s\n", dev->name);
642 }
643 up_write(&nvm_lock);
644
645 return buf - buf_start - 1;
646 }
647
648 static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
649 .set = nvm_configure_by_str_event,
650 .get = nvm_configure_get,
651 };
652
653 #undef MODULE_PARAM_PREFIX
654 #define MODULE_PARAM_PREFIX "lnvm."
655
656 module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
657 0644);
658
659 #endif /* CONFIG_NVM_DEBUG */
660
nvm_ioctl_info(struct file * file,void __user * arg)661 static long nvm_ioctl_info(struct file *file, void __user *arg)
662 {
663 struct nvm_ioctl_info *info;
664 struct nvm_tgt_type *tt;
665 int tgt_iter = 0;
666
667 if (!capable(CAP_SYS_ADMIN))
668 return -EPERM;
669
670 info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
671 if (IS_ERR(info))
672 return -EFAULT;
673
674 info->version[0] = NVM_VERSION_MAJOR;
675 info->version[1] = NVM_VERSION_MINOR;
676 info->version[2] = NVM_VERSION_PATCH;
677
678 down_write(&nvm_lock);
679 list_for_each_entry(tt, &nvm_targets, list) {
680 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
681
682 tgt->version[0] = tt->version[0];
683 tgt->version[1] = tt->version[1];
684 tgt->version[2] = tt->version[2];
685 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
686
687 tgt_iter++;
688 }
689
690 info->tgtsize = tgt_iter;
691 up_write(&nvm_lock);
692
693 if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
694 kfree(info);
695 return -EFAULT;
696 }
697
698 kfree(info);
699 return 0;
700 }
701
nvm_ioctl_get_devices(struct file * file,void __user * arg)702 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
703 {
704 struct nvm_ioctl_get_devices *devices;
705 struct nvm_dev *dev;
706 int i = 0;
707
708 if (!capable(CAP_SYS_ADMIN))
709 return -EPERM;
710
711 devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
712 if (!devices)
713 return -ENOMEM;
714
715 down_write(&nvm_lock);
716 list_for_each_entry(dev, &nvm_devices, devices) {
717 struct nvm_ioctl_device_info *info = &devices->info[i];
718
719 sprintf(info->devname, "%s", dev->name);
720 if (dev->mt) {
721 info->bmversion[0] = dev->mt->version[0];
722 info->bmversion[1] = dev->mt->version[1];
723 info->bmversion[2] = dev->mt->version[2];
724 sprintf(info->bmname, "%s", dev->mt->name);
725 } else {
726 sprintf(info->bmname, "none");
727 }
728
729 i++;
730 if (i > 31) {
731 pr_err("nvm: max 31 devices can be reported.\n");
732 break;
733 }
734 }
735 up_write(&nvm_lock);
736
737 devices->nr_devices = i;
738
739 if (copy_to_user(arg, devices,
740 sizeof(struct nvm_ioctl_get_devices))) {
741 kfree(devices);
742 return -EFAULT;
743 }
744
745 kfree(devices);
746 return 0;
747 }
748
nvm_ioctl_dev_create(struct file * file,void __user * arg)749 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
750 {
751 struct nvm_ioctl_create create;
752
753 if (!capable(CAP_SYS_ADMIN))
754 return -EPERM;
755
756 if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
757 return -EFAULT;
758
759 create.dev[DISK_NAME_LEN - 1] = '\0';
760 create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
761 create.tgtname[DISK_NAME_LEN - 1] = '\0';
762
763 if (create.flags != 0) {
764 pr_err("nvm: no flags supported\n");
765 return -EINVAL;
766 }
767
768 return __nvm_configure_create(&create);
769 }
770
nvm_ioctl_dev_remove(struct file * file,void __user * arg)771 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
772 {
773 struct nvm_ioctl_remove remove;
774
775 if (!capable(CAP_SYS_ADMIN))
776 return -EPERM;
777
778 if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
779 return -EFAULT;
780
781 remove.tgtname[DISK_NAME_LEN - 1] = '\0';
782
783 if (remove.flags != 0) {
784 pr_err("nvm: no flags supported\n");
785 return -EINVAL;
786 }
787
788 return __nvm_configure_remove(&remove);
789 }
790
nvm_ctl_ioctl(struct file * file,uint cmd,unsigned long arg)791 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
792 {
793 void __user *argp = (void __user *)arg;
794
795 switch (cmd) {
796 case NVM_INFO:
797 return nvm_ioctl_info(file, argp);
798 case NVM_GET_DEVICES:
799 return nvm_ioctl_get_devices(file, argp);
800 case NVM_DEV_CREATE:
801 return nvm_ioctl_dev_create(file, argp);
802 case NVM_DEV_REMOVE:
803 return nvm_ioctl_dev_remove(file, argp);
804 }
805 return 0;
806 }
807
808 static const struct file_operations _ctl_fops = {
809 .open = nonseekable_open,
810 .unlocked_ioctl = nvm_ctl_ioctl,
811 .owner = THIS_MODULE,
812 .llseek = noop_llseek,
813 };
814
815 static struct miscdevice _nvm_misc = {
816 .minor = MISC_DYNAMIC_MINOR,
817 .name = "lightnvm",
818 .nodename = "lightnvm/control",
819 .fops = &_ctl_fops,
820 };
821
822 MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
823
nvm_mod_init(void)824 static int __init nvm_mod_init(void)
825 {
826 int ret;
827
828 ret = misc_register(&_nvm_misc);
829 if (ret)
830 pr_err("nvm: misc_register failed for control device");
831
832 return ret;
833 }
834
nvm_mod_exit(void)835 static void __exit nvm_mod_exit(void)
836 {
837 misc_deregister(&_nvm_misc);
838 }
839
840 MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
841 MODULE_LICENSE("GPL v2");
842 MODULE_VERSION("0.1");
843 module_init(nvm_mod_init);
844 module_exit(nvm_mod_exit);
845