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 = 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_secs = dev->nr_luns * dev->sec_per_lun;
467 INIT_LIST_HEAD(&dev->online_targets);
468 mutex_init(&dev->mlock);
469 spin_lock_init(&dev->lock);
474 static void nvm_free(struct nvm_dev *dev)
480 dev->mt->unregister_mgr(dev);
485 static int nvm_init(struct nvm_dev *dev)
489 if (!dev->q || !dev->ops)
492 if (dev->ops->identity(dev, &dev->identity)) {
493 pr_err("nvm: device could not be identified\n");
497 pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
498 dev->identity.ver_id, dev->identity.vmnt,
499 dev->identity.cgrps);
501 if (dev->identity.ver_id != 1) {
502 pr_err("nvm: device not supported by kernel.");
506 if (dev->identity.cgrps != 1) {
507 pr_err("nvm: only one group configuration supported.");
511 ret = nvm_core_init(dev);
513 pr_err("nvm: could not initialize core structures.\n");
517 pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
518 dev->name, dev->sec_per_pg, dev->nr_planes,
519 dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
523 pr_err("nvm: failed to initialize nvm\n");
527 static void nvm_exit(struct nvm_dev *dev)
529 if (dev->ppalist_pool)
530 dev->ops->destroy_dma_pool(dev->ppalist_pool);
533 pr_info("nvm: successfully unloaded\n");
536 int nvm_register(struct request_queue *q, char *disk_name,
537 struct nvm_dev_ops *ops)
545 dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
551 strncpy(dev->name, disk_name, DISK_NAME_LEN);
557 if (dev->ops->max_phys_sect > 256) {
558 pr_info("nvm: max sectors supported is 256.\n");
563 if (dev->ops->max_phys_sect > 1) {
564 dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist");
565 if (!dev->ppalist_pool) {
566 pr_err("nvm: could not create ppa pool\n");
572 if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
573 ret = nvm_get_sysblock(dev, &dev->sb);
575 pr_err("nvm: device not initialized.\n");
577 pr_err("nvm: err (%d) on device initialization\n", ret);
580 /* register device with a supported media manager */
581 down_write(&nvm_lock);
583 dev->mt = nvm_init_mgr(dev);
584 list_add(&dev->devices, &nvm_devices);
592 EXPORT_SYMBOL(nvm_register);
594 void nvm_unregister(char *disk_name)
598 down_write(&nvm_lock);
599 dev = nvm_find_nvm_dev(disk_name);
601 pr_err("nvm: could not find device %s to unregister\n",
607 list_del(&dev->devices);
613 EXPORT_SYMBOL(nvm_unregister);
615 static const struct block_device_operations nvm_fops = {
616 .owner = THIS_MODULE,
619 static int nvm_create_target(struct nvm_dev *dev,
620 struct nvm_ioctl_create *create)
622 struct nvm_ioctl_create_simple *s = &create->conf.s;
623 struct request_queue *tqueue;
624 struct gendisk *tdisk;
625 struct nvm_tgt_type *tt;
626 struct nvm_target *t;
630 pr_info("nvm: device has no media manager registered.\n");
634 down_write(&nvm_lock);
635 tt = nvm_find_target_type(create->tgttype);
637 pr_err("nvm: target type %s not found\n", create->tgttype);
642 list_for_each_entry(t, &dev->online_targets, list) {
643 if (!strcmp(create->tgtname, t->disk->disk_name)) {
644 pr_err("nvm: target name already exists.\n");
651 t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
655 tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
658 blk_queue_make_request(tqueue, tt->make_rq);
660 tdisk = alloc_disk(0);
664 sprintf(tdisk->disk_name, "%s", create->tgtname);
665 tdisk->flags = GENHD_FL_EXT_DEVT;
667 tdisk->first_minor = 0;
668 tdisk->fops = &nvm_fops;
669 tdisk->queue = tqueue;
671 targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
672 if (IS_ERR(targetdata))
675 tdisk->private_data = targetdata;
676 tqueue->queuedata = targetdata;
678 blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
680 set_capacity(tdisk, tt->capacity(targetdata));
686 down_write(&nvm_lock);
687 list_add_tail(&t->list, &dev->online_targets);
694 blk_cleanup_queue(tqueue);
700 static void nvm_remove_target(struct nvm_target *t)
702 struct nvm_tgt_type *tt = t->type;
703 struct gendisk *tdisk = t->disk;
704 struct request_queue *q = tdisk->queue;
706 lockdep_assert_held(&nvm_lock);
709 blk_cleanup_queue(q);
712 tt->exit(tdisk->private_data);
720 static int __nvm_configure_create(struct nvm_ioctl_create *create)
723 struct nvm_ioctl_create_simple *s;
725 down_write(&nvm_lock);
726 dev = nvm_find_nvm_dev(create->dev);
729 pr_err("nvm: device not found\n");
733 if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
734 pr_err("nvm: config type not valid\n");
739 if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
740 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
741 s->lun_begin, s->lun_end, dev->nr_luns);
745 return nvm_create_target(dev, create);
748 static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
750 struct nvm_target *t = NULL;
754 down_write(&nvm_lock);
755 list_for_each_entry(dev, &nvm_devices, devices)
756 list_for_each_entry(t, &dev->online_targets, list) {
757 if (!strcmp(remove->tgtname, t->disk->disk_name)) {
758 nvm_remove_target(t);
766 pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
773 #ifdef CONFIG_NVM_DEBUG
774 static int nvm_configure_show(const char *val)
777 char opcode, devname[DISK_NAME_LEN];
780 ret = sscanf(val, "%c %32s", &opcode, devname);
782 pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
786 down_write(&nvm_lock);
787 dev = nvm_find_nvm_dev(devname);
790 pr_err("nvm: device not found\n");
797 dev->mt->lun_info_print(dev);
802 static int nvm_configure_remove(const char *val)
804 struct nvm_ioctl_remove remove;
808 ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
810 pr_err("nvm: invalid command. Use \"d targetname\".\n");
816 return __nvm_configure_remove(&remove);
819 static int nvm_configure_create(const char *val)
821 struct nvm_ioctl_create create;
823 int lun_begin, lun_end, ret;
825 ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
826 create.tgtname, create.tgttype,
827 &lun_begin, &lun_end);
829 pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
834 create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
835 create.conf.s.lun_begin = lun_begin;
836 create.conf.s.lun_end = lun_end;
838 return __nvm_configure_create(&create);
842 /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
843 static int nvm_configure_by_str_event(const char *val,
844 const struct kernel_param *kp)
849 ret = sscanf(val, "%c", &opcode);
851 pr_err("nvm: string must have the format of \"cmd ...\"\n");
857 return nvm_configure_create(val);
859 return nvm_configure_remove(val);
861 return nvm_configure_show(val);
863 pr_err("nvm: invalid command\n");
870 static int nvm_configure_get(char *buf, const struct kernel_param *kp)
875 sz = sprintf(buf, "available devices:\n");
876 down_write(&nvm_lock);
877 list_for_each_entry(dev, &nvm_devices, devices) {
878 if (sz > 4095 - DISK_NAME_LEN - 2)
880 sz += sprintf(buf + sz, " %32s\n", dev->name);
887 static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
888 .set = nvm_configure_by_str_event,
889 .get = nvm_configure_get,
892 #undef MODULE_PARAM_PREFIX
893 #define MODULE_PARAM_PREFIX "lnvm."
895 module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
898 #endif /* CONFIG_NVM_DEBUG */
900 static long nvm_ioctl_info(struct file *file, void __user *arg)
902 struct nvm_ioctl_info *info;
903 struct nvm_tgt_type *tt;
906 if (!capable(CAP_SYS_ADMIN))
909 info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
913 info->version[0] = NVM_VERSION_MAJOR;
914 info->version[1] = NVM_VERSION_MINOR;
915 info->version[2] = NVM_VERSION_PATCH;
917 down_write(&nvm_lock);
918 list_for_each_entry(tt, &nvm_targets, list) {
919 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
921 tgt->version[0] = tt->version[0];
922 tgt->version[1] = tt->version[1];
923 tgt->version[2] = tt->version[2];
924 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
929 info->tgtsize = tgt_iter;
932 if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
941 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
943 struct nvm_ioctl_get_devices *devices;
947 if (!capable(CAP_SYS_ADMIN))
950 devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
954 down_write(&nvm_lock);
955 list_for_each_entry(dev, &nvm_devices, devices) {
956 struct nvm_ioctl_device_info *info = &devices->info[i];
958 sprintf(info->devname, "%s", dev->name);
960 info->bmversion[0] = dev->mt->version[0];
961 info->bmversion[1] = dev->mt->version[1];
962 info->bmversion[2] = dev->mt->version[2];
963 sprintf(info->bmname, "%s", dev->mt->name);
965 sprintf(info->bmname, "none");
970 pr_err("nvm: max 31 devices can be reported.\n");
976 devices->nr_devices = i;
978 if (copy_to_user(arg, devices,
979 sizeof(struct nvm_ioctl_get_devices))) {
988 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
990 struct nvm_ioctl_create create;
992 if (!capable(CAP_SYS_ADMIN))
995 if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
998 create.dev[DISK_NAME_LEN - 1] = '\0';
999 create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1000 create.tgtname[DISK_NAME_LEN - 1] = '\0';
1002 if (create.flags != 0) {
1003 pr_err("nvm: no flags supported\n");
1007 return __nvm_configure_create(&create);
1010 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1012 struct nvm_ioctl_remove remove;
1014 if (!capable(CAP_SYS_ADMIN))
1017 if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1020 remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1022 if (remove.flags != 0) {
1023 pr_err("nvm: no flags supported\n");
1027 return __nvm_configure_remove(&remove);
1030 static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
1033 info->erase_cnt = 0;
1037 static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
1039 struct nvm_dev *dev;
1040 struct nvm_sb_info info;
1043 down_write(&nvm_lock);
1044 dev = nvm_find_nvm_dev(init->dev);
1045 up_write(&nvm_lock);
1047 pr_err("nvm: device not found\n");
1051 nvm_setup_nvm_sb_info(&info);
1053 strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
1054 info.fs_ppa.ppa = -1;
1056 if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
1057 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 if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT)
1121 return nvm_dev_factory(dev, fact.flags);
1126 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1128 void __user *argp = (void __user *)arg;
1132 return nvm_ioctl_info(file, argp);
1133 case NVM_GET_DEVICES:
1134 return nvm_ioctl_get_devices(file, argp);
1135 case NVM_DEV_CREATE:
1136 return nvm_ioctl_dev_create(file, argp);
1137 case NVM_DEV_REMOVE:
1138 return nvm_ioctl_dev_remove(file, argp);
1140 return nvm_ioctl_dev_init(file, argp);
1141 case NVM_DEV_FACTORY:
1142 return nvm_ioctl_dev_factory(file, argp);
1147 static const struct file_operations _ctl_fops = {
1148 .open = nonseekable_open,
1149 .unlocked_ioctl = nvm_ctl_ioctl,
1150 .owner = THIS_MODULE,
1151 .llseek = noop_llseek,
1154 static struct miscdevice _nvm_misc = {
1155 .minor = MISC_DYNAMIC_MINOR,
1157 .nodename = "lightnvm/control",
1161 MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
1163 static int __init nvm_mod_init(void)
1167 ret = misc_register(&_nvm_misc);
1169 pr_err("nvm: misc_register failed for control device");
1174 static void __exit nvm_mod_exit(void)
1176 misc_deregister(&_nvm_misc);
1179 MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
1180 MODULE_LICENSE("GPL v2");
1181 MODULE_VERSION("0.1");
1182 module_init(nvm_mod_init);
1183 module_exit(nvm_mod_exit);