diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/Makefile | 1 | ||||
| -rw-r--r-- | drivers/lightnvm/Kconfig | 28 | ||||
| -rw-r--r-- | drivers/lightnvm/Makefile | 5 | ||||
| -rw-r--r-- | drivers/lightnvm/core.c | 826 |
5 files changed, 862 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index e69ec82ac80a..3a5ab4d5873d 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -44,6 +44,8 @@ source "drivers/net/Kconfig" source "drivers/isdn/Kconfig" +source "drivers/lightnvm/Kconfig" + # input before char - char/joystick depends on it. As does USB. source "drivers/input/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 42f9dd5f07c8..7f1b7c5a1cfd 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -70,6 +70,7 @@ obj-$(CONFIG_NUBUS) += nubus/ obj-y += macintosh/ obj-$(CONFIG_IDE) += ide/ obj-$(CONFIG_SCSI) += scsi/ +obj-$(CONFIG_NVM) += lightnvm/ obj-y += nvme/ obj-$(CONFIG_ATA) += ata/ obj-$(CONFIG_TARGET_CORE) += target/ diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig new file mode 100644 index 000000000000..d4f309f127cd --- /dev/null +++ b/drivers/lightnvm/Kconfig @@ -0,0 +1,28 @@ +# +# Open-Channel SSD NVM configuration +# + +menuconfig NVM + bool "Open-Channel SSD target support" + depends on BLOCK + help + Say Y here to get to enable Open-channel SSDs. + + Open-Channel SSDs implement a set of extension to SSDs, that + exposes direct access to the underlying non-volatile memory. + + If you say N, all options in this submenu will be skipped and disabled + only do this if you know what you are doing. + +if NVM + +config NVM_DEBUG + bool "Open-Channel SSD debugging support" + ---help--- + Exposes a debug management interface to create/remove targets at: + + /sys/module/lnvm/parameters/configure_debug + + It is required to create/remove targets without IOCTLs. + +endif # NVM diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile new file mode 100644 index 000000000000..38185e990d5d --- /dev/null +++ b/drivers/lightnvm/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for Open-Channel SSDs. +# + +obj-$(CONFIG_NVM) := core.o diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c new file mode 100644 index 000000000000..f659e605a406 --- /dev/null +++ b/drivers/lightnvm/core.c @@ -0,0 +1,826 @@ +/* + * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. + * Initial release: Matias Bjorling <m@bjorling.me> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + */ + +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/list.h> +#include <linux/types.h> +#include <linux/sem.h> +#include <linux/bitmap.h> +#include <linux/module.h> +#include <linux/miscdevice.h> +#include <linux/lightnvm.h> +#include <uapi/linux/lightnvm.h> + +static LIST_HEAD(nvm_targets); +static LIST_HEAD(nvm_mgrs); +static LIST_HEAD(nvm_devices); +static DECLARE_RWSEM(nvm_lock); + +static struct nvm_tgt_type *nvm_find_target_type(const char *name) +{ + struct nvm_tgt_type *tt; + + list_for_each_entry(tt, &nvm_targets, list) + if (!strcmp(name, tt->name)) + return tt; + + return NULL; +} + +int nvm_register_target(struct nvm_tgt_type *tt) +{ + int ret = 0; + + down_write(&nvm_lock); + if (nvm_find_target_type(tt->name)) + ret = -EEXIST; + else + list_add(&tt->list, &nvm_targets); + up_write(&nvm_lock); + + return ret; +} +EXPORT_SYMBOL(nvm_register_target); + +void nvm_unregister_target(struct nvm_tgt_type *tt) +{ + if (!tt) + return; + + down_write(&nvm_lock); + list_del(&tt->list); + up_write(&nvm_lock); +} +EXPORT_SYMBOL(nvm_unregister_target); + +void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, + dma_addr_t *dma_handler) +{ + return dev->ops->dev_dma_alloc(dev->q, dev->ppalist_pool, mem_flags, + dma_handler); +} +EXPORT_SYMBOL(nvm_dev_dma_alloc); + +void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list, + dma_addr_t dma_handler) +{ + dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler); +} +EXPORT_SYMBOL(nvm_dev_dma_free); + +static struct nvmm_type *nvm_find_mgr_type(const char *name) +{ + struct nvmm_type *mt; + + list_for_each_entry(mt, &nvm_mgrs, list) + if (!strcmp(name, mt->name)) + return mt; + + return NULL; +} + +int nvm_register_mgr(struct nvmm_type *mt) +{ + int ret = 0; + + down_write(&nvm_lock); + if (nvm_find_mgr_type(mt->name)) + ret = -EEXIST; + else + list_add(&mt->list, &nvm_mgrs); + up_write(&nvm_lock); + + return ret; +} +EXPORT_SYMBOL(nvm_register_mgr); + +void nvm_unregister_mgr(struct nvmm_type *mt) +{ + if (!mt) + return; + + down_write(&nvm_lock); + list_del(&mt->list); + up_write(&nvm_lock); +} +EXPORT_SYMBOL(nvm_unregister_mgr); + +static struct nvm_dev *nvm_find_nvm_dev(const char *name) +{ + struct nvm_dev *dev; + + list_for_each_entry(dev, &nvm_devices, devices) + if (!strcmp(name, dev->name)) + return dev; + + return NULL; +} + +struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun, + unsigned long flags) +{ + return dev->mt->get_blk(dev, lun, flags); +} +EXPORT_SYMBOL(nvm_get_blk); + +/* Assumes that all valid pages have already been moved on release to bm */ +void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) +{ + return dev->mt->put_blk(dev, blk); +} +EXPORT_SYMBOL(nvm_put_blk); + +int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + return dev->mt->submit_io(dev, rqd); +} +EXPORT_SYMBOL(nvm_submit_io); + +int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk) +{ + return dev->mt->erase_blk(dev, blk, 0); +} +EXPORT_SYMBOL(nvm_erase_blk); + +static void nvm_core_free(struct nvm_dev *dev) +{ + kfree(dev); +} + +static int nvm_core_init(struct nvm_dev *dev) +{ + struct nvm_id *id = &dev->identity; + struct nvm_id_group *grp = &id->groups[0]; + + /* device values */ + dev->nr_chnls = grp->num_ch; + dev->luns_per_chnl = grp->num_lun; + dev->pgs_per_blk = grp->num_pg; + dev->blks_per_lun = grp->num_blk; + dev->nr_planes = grp->num_pln; + dev->sec_size = grp->csecs; + dev->oob_size = grp->sos; + dev->sec_per_pg = grp->fpg_sz / grp->csecs; + dev->addr_mode = id->ppat; + dev->addr_format = id->ppaf; + + dev->plane_mode = NVM_PLANE_SINGLE; + dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size; + + if (grp->mpos & 0x020202) + dev->plane_mode = NVM_PLANE_DOUBLE; + if (grp->mpos & 0x040404) + dev->plane_mode = NVM_PLANE_QUAD; + + /* calculated values */ + dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes; + dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk; + dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun; + dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls; + + dev->total_blocks = dev->nr_planes * + dev->blks_per_lun * + dev->luns_per_chnl * + dev->nr_chnls; + dev->total_pages = dev->total_blocks * dev->pgs_per_blk; + INIT_LIST_HEAD(&dev->online_targets); + + return 0; +} + +static void nvm_free(struct nvm_dev *dev) +{ + if (!dev) + return; + + if (dev->mt) + dev->mt->unregister_mgr(dev); + + nvm_core_free(dev); +} + +static int nvm_init(struct nvm_dev *dev) +{ + struct nvmm_type *mt; + int ret = 0; + + if (!dev->q || !dev->ops) + return -EINVAL; + + if (dev->ops->identity(dev->q, &dev->identity)) { + pr_err("nvm: device could not be identified\n"); + ret = -EINVAL; + goto err; + } + + pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n", + dev->identity.ver_id, dev->identity.vmnt, + dev->identity.cgrps); + + if (dev->identity.ver_id != 1) { + pr_err("nvm: device not supported by kernel."); + goto err; + } + + if (dev->identity.cgrps != 1) { + pr_err("nvm: only one group configuration supported."); + goto err; + } + + ret = nvm_core_init(dev); + if (ret) { + pr_err("nvm: could not initialize core structures.\n"); + goto err; + } + + /* register with device with a supported manager */ + list_for_each_entry(mt, &nvm_mgrs, list) { + ret = mt->register_mgr(dev); + if (ret < 0) + goto err; /* initialization failed */ + if (ret > 0) { + dev->mt = mt; + break; /* successfully initialized */ + } + } + + if (!ret) { + pr_info("nvm: no compatible manager found.\n"); + return 0; + } + + pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n", + dev->name, dev->sec_per_pg, dev->nr_planes, + dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns, + dev->nr_chnls); + return 0; +err: + nvm_free(dev); + pr_err("nvm: failed to initialize nvm\n"); + return ret; +} + +static void nvm_exit(struct nvm_dev *dev) +{ + if (dev->ppalist_pool) + dev->ops->destroy_dma_pool(dev->ppalist_pool); + nvm_free(dev); + + pr_info("nvm: successfully unloaded\n"); +} + +int nvm_register(struct request_queue *q, char *disk_name, + struct nvm_dev_ops *ops) +{ + struct nvm_dev *dev; + int ret; + + if (!ops->identity) + return -EINVAL; + + dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + dev->q = q; + dev->ops = ops; + strncpy(dev->name, disk_name, DISK_NAME_LEN); + + ret = nvm_init(dev); + if (ret) + goto err_init; + + down_write(&nvm_lock); + list_add(&dev->devices, &nvm_devices); + up_write(&nvm_lock); + + if (dev->ops->max_phys_sect > 1) { + dev->ppalist_pool = dev->ops->create_dma_pool(dev->q, + "ppalist"); + if (!dev->ppalist_pool) { + pr_err("nvm: could not create ppa pool\n"); + return -ENOMEM; + } + } else if (dev->ops->max_phys_sect > 256) { + pr_info("nvm: max sectors supported is 256.\n"); + return -EINVAL; + } + + return 0; +err_init: + kfree(dev); + return ret; +} +EXPORT_SYMBOL(nvm_register); + +void nvm_unregister(char *disk_name) +{ + struct nvm_dev *dev = nvm_find_nvm_dev(disk_name); + + if (!dev) { + pr_err("nvm: could not find device %s to unregister\n", + disk_name); + return; + } + + nvm_exit(dev); + + down_write(&nvm_lock); + list_del(&dev->devices); + up_write(&nvm_lock); +} +EXPORT_SYMBOL(nvm_unregister); + +static const struct block_device_operations nvm_fops = { + .owner = THIS_MODULE, +}; + +static int nvm_create_target(struct nvm_dev *dev, + struct nvm_ioctl_create *create) +{ + struct nvm_ioctl_create_simple *s = &create->conf.s; + struct request_queue *tqueue; + struct nvmm_type *mt; + struct gendisk *tdisk; + struct nvm_tgt_type *tt; + struct nvm_target *t; + void *targetdata; + int ret = 0; + + if (!dev->mt) { + /* register with device with a supported NVM manager */ + list_for_each_entry(mt, &nvm_mgrs, list) { + ret = mt->register_mgr(dev); + if (ret < 0) + return ret; /* initialization failed */ + if (ret > 0) { + dev->mt = mt; + break; /* successfully initialized */ + } + } + + if (!ret) { + pr_info("nvm: no compatible nvm manager found.\n"); + return -ENODEV; + } + } + + tt = nvm_find_target_type(create->tgttype); + if (!tt) { + pr_err("nvm: target type %s not found\n", create->tgttype); + return -EINVAL; + } + + down_write(&nvm_lock); + list_for_each_entry(t, &dev->online_targets, list) { + if (!strcmp(create->tgtname, t->disk->disk_name)) { + pr_err("nvm: target name already exists.\n"); + up_write(&nvm_lock); + return -EINVAL; + } + } + up_write(&nvm_lock); + + t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); + if (!t) + return -ENOMEM; + + tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); + if (!tqueue) + goto err_t; + blk_queue_make_request(tqueue, tt->make_rq); + + tdisk = alloc_disk(0); + if (!tdisk) + goto err_queue; + + sprintf(tdisk->disk_name, "%s", create->tgtname); + tdisk->flags = GENHD_FL_EXT_DEVT; + tdisk->major = 0; + tdisk->first_minor = 0; + tdisk->fops = &nvm_fops; + tdisk->queue = tqueue; + + targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end); + if (IS_ERR(targetdata)) + goto err_init; + + tdisk->private_data = targetdata; + tqueue->queuedata = targetdata; + + blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect); + + set_capacity(tdisk, tt->capacity(targetdata)); + add_disk(tdisk); + + t->type = tt; + t->disk = tdisk; + + down_write(&nvm_lock); + list_add_tail(&t->list, &dev->online_targets); + up_write(&nvm_lock); + + return 0; +err_init: + put_disk(tdisk); +err_queue: + blk_cleanup_queue(tqueue); +err_t: + kfree(t); + return -ENOMEM; +} + +static void nvm_remove_target(struct nvm_target *t) +{ + struct nvm_tgt_type *tt = t->type; + struct gendisk *tdisk = t->disk; + struct request_queue *q = tdisk->queue; + + lockdep_assert_held(&nvm_lock); + + del_gendisk(tdisk); + if (tt->exit) + tt->exit(tdisk->private_data); + + blk_cleanup_queue(q); + + put_disk(tdisk); + + list_del(&t->list); + kfree(t); +} + +static int __nvm_configure_create(struct nvm_ioctl_create *create) +{ + struct nvm_dev *dev; + struct nvm_ioctl_create_simple *s; + + dev = nvm_find_nvm_dev(create->dev); + if (!dev) { + pr_err("nvm: device not found\n"); + return -EINVAL; + } + + if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) { + pr_err("nvm: config type not valid\n"); + return -EINVAL; + } + s = &create->conf.s; + + if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) { + pr_err("nvm: lun out of bound (%u:%u > %u)\n", + s->lun_begin, s->lun_end, dev->nr_luns); + return -EINVAL; + } + + return nvm_create_target(dev, create); +} + +static int __nvm_configure_remove(struct nvm_ioctl_remove *remove) +{ + struct nvm_target *t = NULL; + struct nvm_dev *dev; + int ret = -1; + + down_write(&nvm_lock); + list_for_each_entry(dev, &nvm_devices, devices) + list_for_each_entry(t, &dev->online_targets, list) { + if (!strcmp(remove->tgtname, t->disk->disk_name)) { + nvm_remove_target(t); + ret = 0; + break; + } + } + up_write(&nvm_lock); + + if (ret) { + pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname); + return -EINVAL; + } + + return 0; +} + +#ifdef CONFIG_NVM_DEBUG +static int nvm_configure_show(const char *val) +{ + struct nvm_dev *dev; + char opcode, devname[DISK_NAME_LEN]; + int ret; + + ret = sscanf(val, "%c %32s", &opcode, devname); + if (ret != 2) { + pr_err("nvm: invalid command. Use \"opcode devicename\".\n"); + return -EINVAL; + } + + dev = nvm_find_nvm_dev(devname); + if (!dev) { + pr_err("nvm: device not found\n"); + return -EINVAL; + } + + if (!dev->mt) + return 0; + + dev->mt->free_blocks_print(dev); + + return 0; +} + +static int nvm_configure_remove(const char *val) +{ + struct nvm_ioctl_remove remove; + char opcode; + int ret; + + ret = sscanf(val, "%c %256s", &opcode, remove.tgtname); + if (ret != 2) { + pr_err("nvm: invalid command. Use \"d targetname\".\n"); + return -EINVAL; + } + + remove.flags = 0; + + return __nvm_configure_remove(&remove); +} + +static int nvm_configure_create(const char *val) +{ + struct nvm_ioctl_create create; + char opcode; + int lun_begin, lun_end, ret; + + ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev, + create.tgtname, create.tgttype, + &lun_begin, &lun_end); + if (ret != 6) { + pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n"); + return -EINVAL; + } + + create.flags = 0; + create.conf.type = NVM_CONFIG_TYPE_SIMPLE; + create.conf.s.lun_begin = lun_begin; + create.conf.s.lun_end = lun_end; + + return __nvm_configure_create(&create); +} + + +/* Exposes administrative interface through /sys/module/lnvm/configure_by_str */ +static int nvm_configure_by_str_event(const char *val, + const struct kernel_param *kp) +{ + char opcode; + int ret; + + ret = sscanf(val, "%c", &opcode); + if (ret != 1) { + pr_err("nvm: string must have the format of \"cmd ...\"\n"); + return -EINVAL; + } + + switch (opcode) { + case 'a': + return nvm_configure_create(val); + case 'd': + return nvm_configure_remove(val); + case 's': + return nvm_configure_show(val); + default: + pr_err("nvm: invalid command\n"); + return -EINVAL; + } + + return 0; +} + +static int nvm_configure_get(char *buf, const struct kernel_param *kp) +{ + int sz = 0; + char *buf_start = buf; + struct nvm_dev *dev; + + buf += sprintf(buf, "available devices:\n"); + down_write(&nvm_lock); + list_for_each_entry(dev, &nvm_devices, devices) { + if (sz > 4095 - DISK_NAME_LEN) + break; + buf += sprintf(buf, " %32s\n", dev->name); + } + up_write(&nvm_lock); + + return buf - buf_start - 1; +} + +static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = { + .set = nvm_configure_by_str_event, + .get = nvm_configure_get, +}; + +#undef MODULE_PARAM_PREFIX +#define MODULE_PARAM_PREFIX "lnvm." + +module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL, + 0644); + +#endif /* CONFIG_NVM_DEBUG */ + +static long nvm_ioctl_info(struct file *file, void __user *arg) +{ + struct nvm_ioctl_info *info; + struct nvm_tgt_type *tt; + int tgt_iter = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); + if (IS_ERR(info)) + return -EFAULT; + + info->version[0] = NVM_VERSION_MAJOR; + info->version[1] = NVM_VERSION_MINOR; + info->version[2] = NVM_VERSION_PATCH; + + down_write(&nvm_lock); + list_for_each_entry(tt, &nvm_targets, list) { + struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; + + tgt->version[0] = tt->version[0]; + tgt->version[1] = tt->version[1]; + tgt->version[2] = tt->version[2]; + strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); + + tgt_iter++; + } + + info->tgtsize = tgt_iter; + up_write(&nvm_lock); + + if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) + return -EFAULT; + + kfree(info); + return 0; +} + +static long nvm_ioctl_get_devices(struct file *file, void __user *arg) +{ + struct nvm_ioctl_get_devices *devices; + struct nvm_dev *dev; + int i = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); + if (!devices) + return -ENOMEM; + + down_write(&nvm_lock); + list_for_each_entry(dev, &nvm_devices, devices) { + struct nvm_ioctl_device_info *info = &devices->info[i]; + + sprintf(info->devname, "%s", dev->name); + if (dev->mt) { + info->bmversion[0] = dev->mt->version[0]; + info->bmversion[1] = dev->mt->version[1]; + info->bmversion[2] = dev->mt->version[2]; + sprintf(info->bmname, "%s", dev->mt->name); + } else { + sprintf(info->bmname, "none"); + } + + i++; + if (i > 31) { + pr_err("nvm: max 31 devices can be reported.\n"); + break; + } + } + up_write(&nvm_lock); + + devices->nr_devices = i; + + if (copy_to_user(arg, devices, sizeof(struct nvm_ioctl_get_devices))) + return -EFAULT; + + kfree(devices); + return 0; +} + +static long nvm_ioctl_dev_create(struct file *file, void __user *arg) +{ + struct nvm_ioctl_create create; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) + return -EFAULT; + + create.dev[DISK_NAME_LEN - 1] = '\0'; + create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; + create.tgtname[DISK_NAME_LEN - 1] = '\0'; + + if (create.flags != 0) { + pr_err("nvm: no flags supported\n"); + return -EINVAL; + } + + return __nvm_configure_create(&create); +} + +static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) +{ + struct nvm_ioctl_remove remove; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) + return -EFAULT; + + remove.tgtname[DISK_NAME_LEN - 1] = '\0'; + + if (remove.flags != 0) { + pr_err("nvm: no flags supported\n"); + return -EINVAL; + } + + return __nvm_configure_remove(&remove); +} + +static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) +{ + void __user *argp = (void __user *)arg; + + switch (cmd) { + case NVM_INFO: + return nvm_ioctl_info(file, argp); + case NVM_GET_DEVICES: + return nvm_ioctl_get_devices(file, argp); + case NVM_DEV_CREATE: + return nvm_ioctl_dev_create(file, argp); + case NVM_DEV_REMOVE: + return nvm_ioctl_dev_remove(file, argp); + } + return 0; +} + +static const struct file_operations _ctl_fops = { + .open = nonseekable_open, + .unlocked_ioctl = nvm_ctl_ioctl, + .owner = THIS_MODULE, + .llseek = noop_llseek, +}; + +static struct miscdevice _nvm_misc = { + .minor = MISC_DYNAMIC_MINOR, + .name = "lightnvm", + .nodename = "lightnvm/control", + .fops = &_ctl_fops, +}; + +MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR); + +static int __init nvm_mod_init(void) +{ + int ret; + + ret = misc_register(&_nvm_misc); + if (ret) + pr_err("nvm: misc_register failed for control device"); + + return ret; +} + +static void __exit nvm_mod_exit(void) +{ + misc_deregister(&_nvm_misc); +} + +MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION("0.1"); +module_init(nvm_mod_init); +module_exit(nvm_mod_exit); |