2 * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
3 * Initial release: Matias Bjorling <m@bjorling.me>
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.
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.
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,
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 <linux/sched/sysctl.h>
31 #include <uapi/linux/lightnvm.h>
33 static LIST_HEAD(nvm_targets);
34 static LIST_HEAD(nvm_mgrs);
35 static LIST_HEAD(nvm_devices);
36 static DECLARE_RWSEM(nvm_lock);
38 static struct nvm_tgt_type *nvm_find_target_type(const char *name)
40 struct nvm_tgt_type *tt;
42 list_for_each_entry(tt, &nvm_targets, list)
43 if (!strcmp(name, tt->name))
49 int nvm_register_target(struct nvm_tgt_type *tt)
53 down_write(&nvm_lock);
54 if (nvm_find_target_type(tt->name))
57 list_add(&tt->list, &nvm_targets);
62 EXPORT_SYMBOL(nvm_register_target);
64 void nvm_unregister_target(struct nvm_tgt_type *tt)
69 down_write(&nvm_lock);
73 EXPORT_SYMBOL(nvm_unregister_target);
75 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
76 dma_addr_t *dma_handler)
78 return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags,
81 EXPORT_SYMBOL(nvm_dev_dma_alloc);
83 void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list,
84 dma_addr_t dma_handler)
86 dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler);
88 EXPORT_SYMBOL(nvm_dev_dma_free);
90 static struct nvmm_type *nvm_find_mgr_type(const char *name)
94 list_for_each_entry(mt, &nvm_mgrs, list)
95 if (!strcmp(name, mt->name))
101 struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev)
103 struct nvmm_type *mt;
106 lockdep_assert_held(&nvm_lock);
108 list_for_each_entry(mt, &nvm_mgrs, list) {
109 if (strncmp(dev->sb.mmtype, mt->name, NVM_MMTYPE_LEN))
112 ret = mt->register_mgr(dev);
114 pr_err("nvm: media mgr failed to init (%d) on dev %s\n",
116 return NULL; /* initialization failed */
124 int nvm_register_mgr(struct nvmm_type *mt)
129 down_write(&nvm_lock);
130 if (nvm_find_mgr_type(mt->name)) {
134 list_add(&mt->list, &nvm_mgrs);
137 /* try to register media mgr if any device have none configured */
138 list_for_each_entry(dev, &nvm_devices, devices) {
142 dev->mt = nvm_init_mgr(dev);
149 EXPORT_SYMBOL(nvm_register_mgr);
151 void nvm_unregister_mgr(struct nvmm_type *mt)
156 down_write(&nvm_lock);
160 EXPORT_SYMBOL(nvm_unregister_mgr);
162 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
166 list_for_each_entry(dev, &nvm_devices, devices)
167 if (!strcmp(name, dev->name))
173 struct nvm_block *nvm_get_blk_unlocked(struct nvm_dev *dev, struct nvm_lun *lun,
176 return dev->mt->get_blk_unlocked(dev, lun, flags);
178 EXPORT_SYMBOL(nvm_get_blk_unlocked);
180 /* Assumes that all valid pages have already been moved on release to bm */
181 void nvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk)
183 return dev->mt->put_blk_unlocked(dev, blk);
185 EXPORT_SYMBOL(nvm_put_blk_unlocked);
187 struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun,
190 return dev->mt->get_blk(dev, lun, flags);
192 EXPORT_SYMBOL(nvm_get_blk);
194 /* Assumes that all valid pages have already been moved on release to bm */
195 void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
197 return dev->mt->put_blk(dev, blk);
199 EXPORT_SYMBOL(nvm_put_blk);
201 int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
203 return dev->mt->submit_io(dev, rqd);
205 EXPORT_SYMBOL(nvm_submit_io);
207 int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
209 return dev->mt->erase_blk(dev, blk, 0);
211 EXPORT_SYMBOL(nvm_erase_blk);
213 void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
217 if (rqd->nr_pages > 1) {
218 for (i = 0; i < rqd->nr_pages; i++)
219 rqd->ppa_list[i] = dev_to_generic_addr(dev,
222 rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr);
225 EXPORT_SYMBOL(nvm_addr_to_generic_mode);
227 void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
231 if (rqd->nr_pages > 1) {
232 for (i = 0; i < rqd->nr_pages; i++)
233 rqd->ppa_list[i] = generic_to_dev_addr(dev,
236 rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
239 EXPORT_SYMBOL(nvm_generic_to_addr_mode);
241 int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
242 struct ppa_addr *ppas, int nr_ppas)
244 int i, plane_cnt, pl_idx;
246 if (dev->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
248 rqd->ppa_addr = ppas[0];
253 plane_cnt = (1 << dev->plane_mode);
254 rqd->nr_pages = plane_cnt * nr_ppas;
256 if (dev->ops->max_phys_sect < rqd->nr_pages)
259 rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
260 if (!rqd->ppa_list) {
261 pr_err("nvm: failed to allocate dma memory\n");
265 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
266 for (i = 0; i < nr_ppas; i++) {
267 ppas[i].g.pl = pl_idx;
268 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppas[i];
274 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
276 void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
281 nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
283 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
285 int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas)
290 if (!dev->ops->erase_block)
293 memset(&rqd, 0, sizeof(struct nvm_rq));
295 ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas);
299 nvm_generic_to_addr_mode(dev, &rqd);
301 ret = dev->ops->erase_block(dev, &rqd);
303 nvm_free_rqd_ppalist(dev, &rqd);
307 EXPORT_SYMBOL(nvm_erase_ppa);
309 void nvm_end_io(struct nvm_rq *rqd, int error)
314 EXPORT_SYMBOL(nvm_end_io);
316 static void nvm_end_io_sync(struct nvm_rq *rqd)
318 struct completion *waiting = rqd->wait;
325 int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas,
326 int opcode, int flags, void *buf, int len)
328 DECLARE_COMPLETION_ONSTACK(wait);
332 unsigned long hang_check;
334 bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL);
335 if (IS_ERR_OR_NULL(bio))
338 memset(&rqd, 0, sizeof(struct nvm_rq));
339 ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas);
349 rqd.end_io = nvm_end_io_sync;
351 nvm_generic_to_addr_mode(dev, &rqd);
353 ret = dev->ops->submit_io(dev, &rqd);
355 /* Prevent hang_check timer from firing at us during very long I/O */
356 hang_check = sysctl_hung_task_timeout_secs;
358 while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
360 wait_for_completion_io(&wait);
362 nvm_free_rqd_ppalist(dev, &rqd);
366 EXPORT_SYMBOL(nvm_submit_ppa);
368 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
372 dev->lps_per_blk = dev->pgs_per_blk;
373 dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
377 /* Just a linear array */
378 for (i = 0; i < dev->lps_per_blk; i++)
384 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
387 struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
392 dev->lps_per_blk = mlc->num_pairs;
393 dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
397 /* The lower page table encoding consists of a list of bytes, where each
398 * has a lower and an upper half. The first half byte maintains the
399 * increment value and every value after is an offset added to the
400 * previous incrementation value */
401 dev->lptbl[0] = mlc->pairs[0] & 0xF;
402 for (i = 1; i < dev->lps_per_blk; i++) {
403 p = mlc->pairs[i >> 1];
404 if (i & 0x1) /* upper */
405 dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
407 dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
413 static int nvm_core_init(struct nvm_dev *dev)
415 struct nvm_id *id = &dev->identity;
416 struct nvm_id_group *grp = &id->groups[0];
419 dev->nr_chnls = grp->num_ch;
420 dev->luns_per_chnl = grp->num_lun;
421 dev->pgs_per_blk = grp->num_pg;
422 dev->blks_per_lun = grp->num_blk;
423 dev->nr_planes = grp->num_pln;
424 dev->sec_size = grp->csecs;
425 dev->oob_size = grp->sos;
426 dev->sec_per_pg = grp->fpg_sz / grp->csecs;
427 dev->mccap = grp->mccap;
428 memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
430 dev->plane_mode = NVM_PLANE_SINGLE;
431 dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
433 if (grp->mtype != 0) {
434 pr_err("nvm: memory type not supported\n");
438 switch (grp->fmtype) {
439 case NVM_ID_FMTYPE_SLC:
440 if (nvm_init_slc_tbl(dev, grp))
443 case NVM_ID_FMTYPE_MLC:
444 if (nvm_init_mlc_tbl(dev, grp))
448 pr_err("nvm: flash type not supported\n");
452 if (!dev->lps_per_blk)
453 pr_info("nvm: lower page programming table missing\n");
455 if (grp->mpos & 0x020202)
456 dev->plane_mode = NVM_PLANE_DOUBLE;
457 if (grp->mpos & 0x040404)
458 dev->plane_mode = NVM_PLANE_QUAD;
460 /* calculated values */
461 dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
462 dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
463 dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
464 dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
466 dev->total_blocks = dev->nr_planes *
470 dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
471 INIT_LIST_HEAD(&dev->online_targets);
472 mutex_init(&dev->mlock);
477 static void nvm_free(struct nvm_dev *dev)
483 dev->mt->unregister_mgr(dev);
488 static int nvm_init(struct nvm_dev *dev)
492 if (!dev->q || !dev->ops)
495 if (dev->ops->identity(dev, &dev->identity)) {
496 pr_err("nvm: device could not be identified\n");
500 pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
501 dev->identity.ver_id, dev->identity.vmnt,
502 dev->identity.cgrps);
504 if (dev->identity.ver_id != 1) {
505 pr_err("nvm: device not supported by kernel.");
509 if (dev->identity.cgrps != 1) {
510 pr_err("nvm: only one group configuration supported.");
514 ret = nvm_core_init(dev);
516 pr_err("nvm: could not initialize core structures.\n");
520 pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
521 dev->name, dev->sec_per_pg, dev->nr_planes,
522 dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
526 pr_err("nvm: failed to initialize nvm\n");
530 static void nvm_exit(struct nvm_dev *dev)
532 if (dev->ppalist_pool)
533 dev->ops->destroy_dma_pool(dev->ppalist_pool);
536 pr_info("nvm: successfully unloaded\n");
539 int nvm_register(struct request_queue *q, char *disk_name,
540 struct nvm_dev_ops *ops)
548 dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
554 strncpy(dev->name, disk_name, DISK_NAME_LEN);
560 if (dev->ops->max_phys_sect > 256) {
561 pr_info("nvm: max sectors supported is 256.\n");
566 if (dev->ops->max_phys_sect > 1) {
567 dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist");
568 if (!dev->ppalist_pool) {
569 pr_err("nvm: could not create ppa pool\n");
575 ret = nvm_get_sysblock(dev, &dev->sb);
577 pr_err("nvm: device not initialized.\n");
579 pr_err("nvm: err (%d) on device initialization\n", ret);
581 /* register device with a supported media manager */
582 down_write(&nvm_lock);
584 dev->mt = nvm_init_mgr(dev);
585 list_add(&dev->devices, &nvm_devices);
593 EXPORT_SYMBOL(nvm_register);
595 void nvm_unregister(char *disk_name)
599 down_write(&nvm_lock);
600 dev = nvm_find_nvm_dev(disk_name);
602 pr_err("nvm: could not find device %s to unregister\n",
608 list_del(&dev->devices);
614 EXPORT_SYMBOL(nvm_unregister);
616 static const struct block_device_operations nvm_fops = {
617 .owner = THIS_MODULE,
620 static int nvm_create_target(struct nvm_dev *dev,
621 struct nvm_ioctl_create *create)
623 struct nvm_ioctl_create_simple *s = &create->conf.s;
624 struct request_queue *tqueue;
625 struct gendisk *tdisk;
626 struct nvm_tgt_type *tt;
627 struct nvm_target *t;
631 pr_info("nvm: device has no media manager registered.\n");
635 down_write(&nvm_lock);
636 tt = nvm_find_target_type(create->tgttype);
638 pr_err("nvm: target type %s not found\n", create->tgttype);
643 list_for_each_entry(t, &dev->online_targets, list) {
644 if (!strcmp(create->tgtname, t->disk->disk_name)) {
645 pr_err("nvm: target name already exists.\n");
652 t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
656 tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
659 blk_queue_make_request(tqueue, tt->make_rq);
661 tdisk = alloc_disk(0);
665 sprintf(tdisk->disk_name, "%s", create->tgtname);
666 tdisk->flags = GENHD_FL_EXT_DEVT;
668 tdisk->first_minor = 0;
669 tdisk->fops = &nvm_fops;
670 tdisk->queue = tqueue;
672 targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
673 if (IS_ERR(targetdata))
676 tdisk->private_data = targetdata;
677 tqueue->queuedata = targetdata;
679 blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
681 set_capacity(tdisk, tt->capacity(targetdata));
687 down_write(&nvm_lock);
688 list_add_tail(&t->list, &dev->online_targets);
695 blk_cleanup_queue(tqueue);
701 static void nvm_remove_target(struct nvm_target *t)
703 struct nvm_tgt_type *tt = t->type;
704 struct gendisk *tdisk = t->disk;
705 struct request_queue *q = tdisk->queue;
707 lockdep_assert_held(&nvm_lock);
710 blk_cleanup_queue(q);
713 tt->exit(tdisk->private_data);
721 static int __nvm_configure_create(struct nvm_ioctl_create *create)
724 struct nvm_ioctl_create_simple *s;
726 down_write(&nvm_lock);
727 dev = nvm_find_nvm_dev(create->dev);
730 pr_err("nvm: device not found\n");
734 if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
735 pr_err("nvm: config type not valid\n");
740 if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
741 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
742 s->lun_begin, s->lun_end, dev->nr_luns);
746 return nvm_create_target(dev, create);
749 static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
751 struct nvm_target *t = NULL;
755 down_write(&nvm_lock);
756 list_for_each_entry(dev, &nvm_devices, devices)
757 list_for_each_entry(t, &dev->online_targets, list) {
758 if (!strcmp(remove->tgtname, t->disk->disk_name)) {
759 nvm_remove_target(t);
767 pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
774 #ifdef CONFIG_NVM_DEBUG
775 static int nvm_configure_show(const char *val)
778 char opcode, devname[DISK_NAME_LEN];
781 ret = sscanf(val, "%c %32s", &opcode, devname);
783 pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
787 down_write(&nvm_lock);
788 dev = nvm_find_nvm_dev(devname);
791 pr_err("nvm: device not found\n");
798 dev->mt->lun_info_print(dev);
803 static int nvm_configure_remove(const char *val)
805 struct nvm_ioctl_remove remove;
809 ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
811 pr_err("nvm: invalid command. Use \"d targetname\".\n");
817 return __nvm_configure_remove(&remove);
820 static int nvm_configure_create(const char *val)
822 struct nvm_ioctl_create create;
824 int lun_begin, lun_end, ret;
826 ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
827 create.tgtname, create.tgttype,
828 &lun_begin, &lun_end);
830 pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
835 create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
836 create.conf.s.lun_begin = lun_begin;
837 create.conf.s.lun_end = lun_end;
839 return __nvm_configure_create(&create);
843 /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
844 static int nvm_configure_by_str_event(const char *val,
845 const struct kernel_param *kp)
850 ret = sscanf(val, "%c", &opcode);
852 pr_err("nvm: string must have the format of \"cmd ...\"\n");
858 return nvm_configure_create(val);
860 return nvm_configure_remove(val);
862 return nvm_configure_show(val);
864 pr_err("nvm: invalid command\n");
871 static int nvm_configure_get(char *buf, const struct kernel_param *kp)
874 char *buf_start = buf;
877 buf += sprintf(buf, "available devices:\n");
878 down_write(&nvm_lock);
879 list_for_each_entry(dev, &nvm_devices, devices) {
880 if (sz > 4095 - DISK_NAME_LEN)
882 buf += sprintf(buf, " %32s\n", dev->name);
886 return buf - buf_start - 1;
889 static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
890 .set = nvm_configure_by_str_event,
891 .get = nvm_configure_get,
894 #undef MODULE_PARAM_PREFIX
895 #define MODULE_PARAM_PREFIX "lnvm."
897 module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
900 #endif /* CONFIG_NVM_DEBUG */
902 static long nvm_ioctl_info(struct file *file, void __user *arg)
904 struct nvm_ioctl_info *info;
905 struct nvm_tgt_type *tt;
908 if (!capable(CAP_SYS_ADMIN))
911 info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
915 info->version[0] = NVM_VERSION_MAJOR;
916 info->version[1] = NVM_VERSION_MINOR;
917 info->version[2] = NVM_VERSION_PATCH;
919 down_write(&nvm_lock);
920 list_for_each_entry(tt, &nvm_targets, list) {
921 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
923 tgt->version[0] = tt->version[0];
924 tgt->version[1] = tt->version[1];
925 tgt->version[2] = tt->version[2];
926 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
931 info->tgtsize = tgt_iter;
934 if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
943 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
945 struct nvm_ioctl_get_devices *devices;
949 if (!capable(CAP_SYS_ADMIN))
952 devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
956 down_write(&nvm_lock);
957 list_for_each_entry(dev, &nvm_devices, devices) {
958 struct nvm_ioctl_device_info *info = &devices->info[i];
960 sprintf(info->devname, "%s", dev->name);
962 info->bmversion[0] = dev->mt->version[0];
963 info->bmversion[1] = dev->mt->version[1];
964 info->bmversion[2] = dev->mt->version[2];
965 sprintf(info->bmname, "%s", dev->mt->name);
967 sprintf(info->bmname, "none");
972 pr_err("nvm: max 31 devices can be reported.\n");
978 devices->nr_devices = i;
980 if (copy_to_user(arg, devices,
981 sizeof(struct nvm_ioctl_get_devices))) {
990 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
992 struct nvm_ioctl_create create;
994 if (!capable(CAP_SYS_ADMIN))
997 if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1000 create.dev[DISK_NAME_LEN - 1] = '\0';
1001 create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1002 create.tgtname[DISK_NAME_LEN - 1] = '\0';
1004 if (create.flags != 0) {
1005 pr_err("nvm: no flags supported\n");
1009 return __nvm_configure_create(&create);
1012 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1014 struct nvm_ioctl_remove remove;
1016 if (!capable(CAP_SYS_ADMIN))
1019 if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1022 remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1024 if (remove.flags != 0) {
1025 pr_err("nvm: no flags supported\n");
1029 return __nvm_configure_remove(&remove);
1032 static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
1035 info->erase_cnt = 0;
1039 static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
1041 struct nvm_dev *dev;
1042 struct nvm_sb_info info;
1045 down_write(&nvm_lock);
1046 dev = nvm_find_nvm_dev(init->dev);
1047 up_write(&nvm_lock);
1049 pr_err("nvm: device not found\n");
1053 nvm_setup_nvm_sb_info(&info);
1055 strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
1056 info.fs_ppa.ppa = -1;
1058 ret = nvm_init_sysblock(dev, &info);
1062 memcpy(&dev->sb, &info, sizeof(struct nvm_sb_info));
1064 down_write(&nvm_lock);
1065 dev->mt = nvm_init_mgr(dev);
1066 up_write(&nvm_lock);
1071 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1073 struct nvm_ioctl_dev_init init;
1075 if (!capable(CAP_SYS_ADMIN))
1078 if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1081 if (init.flags != 0) {
1082 pr_err("nvm: no flags supported\n");
1086 init.dev[DISK_NAME_LEN - 1] = '\0';
1088 return __nvm_ioctl_dev_init(&init);
1091 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1093 struct nvm_ioctl_dev_factory fact;
1094 struct nvm_dev *dev;
1096 if (!capable(CAP_SYS_ADMIN))
1099 if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1102 fact.dev[DISK_NAME_LEN - 1] = '\0';
1104 if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1107 down_write(&nvm_lock);
1108 dev = nvm_find_nvm_dev(fact.dev);
1109 up_write(&nvm_lock);
1111 pr_err("nvm: device not found\n");
1116 dev->mt->unregister_mgr(dev);
1120 return nvm_dev_factory(dev, fact.flags);
1123 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1125 void __user *argp = (void __user *)arg;
1129 return nvm_ioctl_info(file, argp);
1130 case NVM_GET_DEVICES:
1131 return nvm_ioctl_get_devices(file, argp);
1132 case NVM_DEV_CREATE:
1133 return nvm_ioctl_dev_create(file, argp);
1134 case NVM_DEV_REMOVE:
1135 return nvm_ioctl_dev_remove(file, argp);
1137 return nvm_ioctl_dev_init(file, argp);
1138 case NVM_DEV_FACTORY:
1139 return nvm_ioctl_dev_factory(file, argp);
1144 static const struct file_operations _ctl_fops = {
1145 .open = nonseekable_open,
1146 .unlocked_ioctl = nvm_ctl_ioctl,
1147 .owner = THIS_MODULE,
1148 .llseek = noop_llseek,
1151 static struct miscdevice _nvm_misc = {
1152 .minor = MISC_DYNAMIC_MINOR,
1154 .nodename = "lightnvm/control",
1158 MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
1160 static int __init nvm_mod_init(void)
1164 ret = misc_register(&_nvm_misc);
1166 pr_err("nvm: misc_register failed for control device");
1171 static void __exit nvm_mod_exit(void)
1173 misc_deregister(&_nvm_misc);
1176 MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
1177 MODULE_LICENSE("GPL v2");
1178 MODULE_VERSION("0.1");
1179 module_init(nvm_mod_init);
1180 module_exit(nvm_mod_exit);