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
32static LIST_HEAD(nvm_targets);
33static LIST_HEAD(nvm_mgrs);
34static LIST_HEAD(nvm_devices);
35static DECLARE_RWSEM(nvm_lock);
36
37static 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
48int 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}
61EXPORT_SYMBOL(nvm_register_target);
62
63void 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}
72EXPORT_SYMBOL(nvm_unregister_target);
73
74void *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}
80EXPORT_SYMBOL(nvm_dev_dma_alloc);
81
82void 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}
87EXPORT_SYMBOL(nvm_dev_dma_free);
88
89static 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
100struct 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
120int 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	}
140finish:
141	up_write(&nvm_lock);
142
143	return ret;
144}
145EXPORT_SYMBOL(nvm_register_mgr);
146
147void 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}
156EXPORT_SYMBOL(nvm_unregister_mgr);
157
158static 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
169struct 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}
174EXPORT_SYMBOL(nvm_get_blk);
175
176/* Assumes that all valid pages have already been moved on release to bm */
177void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
178{
179	return dev->mt->put_blk(dev, blk);
180}
181EXPORT_SYMBOL(nvm_put_blk);
182
183int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
184{
185	return dev->mt->submit_io(dev, rqd);
186}
187EXPORT_SYMBOL(nvm_submit_io);
188
189int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
190{
191	return dev->mt->erase_blk(dev, blk, 0);
192}
193EXPORT_SYMBOL(nvm_erase_blk);
194
195static 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
245static 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
254static 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;
291err:
292	pr_err("nvm: failed to initialize nvm\n");
293	return ret;
294}
295
296static 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
305int 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;
348err_init:
349	kfree(dev);
350	return ret;
351}
352EXPORT_SYMBOL(nvm_register);
353
354void 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}
373EXPORT_SYMBOL(nvm_unregister);
374
375static const struct block_device_operations nvm_fops = {
376	.owner		= THIS_MODULE,
377};
378
379static 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;
451err_init:
452	put_disk(tdisk);
453err_queue:
454	blk_cleanup_queue(tqueue);
455err_t:
456	kfree(t);
457	return -ENOMEM;
458}
459
460static 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
480static 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
508static 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
534static 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
562static 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
579static 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 */
603static 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
630static 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
648static 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
656module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
657									0644);
658
659#endif /* CONFIG_NVM_DEBUG */
660
661static 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
702static 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
749static 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
771static 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
791static 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
808static 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
815static struct miscdevice _nvm_misc = {
816	.minor		= MISC_DYNAMIC_MINOR,
817	.name		= "lightnvm",
818	.nodename	= "lightnvm/control",
819	.fops		= &_ctl_fops,
820};
821
822MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
823
824static 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
835static void __exit nvm_mod_exit(void)
836{
837	misc_deregister(&_nvm_misc);
838}
839
840MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
841MODULE_LICENSE("GPL v2");
842MODULE_VERSION("0.1");
843module_init(nvm_mod_init);
844module_exit(nvm_mod_exit);
845