Merge branch 'for-4.4/lightnvm' of git://git.kernel.dk/linux-block

Pull lightnvm support from Jens Axboe:
 "This adds support for lightnvm, and adds support to NVMe as well.
  This is pretty exciting, in that it enables new and interesting use
  cases for compatible flash devices.  There's a LWN writeup about an
  earlier posting here:

      https://lwn.net/Articles/641247/

  This has been underway for a while, and should be ready for merging at
  this point"

* 'for-4.4/lightnvm' of git://git.kernel.dk/linux-block:
  nvme: lightnvm: clean up a data type
  lightnvm: refactor phys addrs type to u64
  nvme: LightNVM support
  rrpc: Round-robin sector target with cost-based gc
  gennvm: Generic NVM manager
  lightnvm: Support for Open-Channel SSDs

17 files changed, 4197 insertions, 12 deletions

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index df1b25eb8382..8a44d44cf901 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -149,6 +149,7 @@ Code  Seq#(hex)	Include File		Comments
 'K'     all     linux/kd.h
 'L'     00-1F   linux/loop.h            conflict!
 'L'     10-1F   drivers/scsi/mpt2sas/mpt2sas_ctl.h      conflict!
+'L'     20-2F   linux/lightnvm.h
 'L'     E0-FF   linux/ppdd.h            encrypted disk device driver
                                         <http://linux01.gwdg.de/~alatham/ppdd.html>
 'M'     all     linux/soundcard.h       conflict!
diff --git a/MAINTAINERS b/MAINTAINERS
index 249f96923642..ed6dccf2bfa0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6279,6 +6279,14 @@ F:	drivers/nvdimm/pmem.c
 F:      include/linux/pmem.h
 F:      arch/*/include/asm/pmem.h
 
+LIGHTNVM PLATFORM SUPPORT
+M:      Matias Bjorling <mb@lightnvm.io>
+W:      http://github/OpenChannelSSD
+S:      Maintained
+F:      drivers/lightnvm/
+F:      include/linux/lightnvm.h
+F:      include/uapi/linux/lightnvm.h
+
 LINUX FOR IBM pSERIES (RS/6000)
 M:      Paul Mackerras <paulus@au.ibm.com>
 W:      http://www.ibm.com/linux/ltc/projects/ppc
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..a16bf56d3f28
--- /dev/null
+++ b/drivers/lightnvm/Kconfig
@@ -0,0 +1,42 @@
+#
+# 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.
+
+config NVM_GENNVM
+        tristate "Generic NVM manager for Open-Channel SSDs"
+        ---help---
+        NVM media manager for Open-Channel SSDs that offload management
+        functionality to device, while keeping data placement and garbage
+        collection decisions on the host.
+
+config NVM_RRPC
+        tristate "Round-robin Hybrid Open-Channel SSD target"
+        ---help---
+        Allows an open-channel SSD to be exposed as a block device to the
+        host. The target is implemented using a linear mapping table and
+        cost-based garbage collection. It is optimized for 4K IO sizes.
+
+endif # NVM
diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile
new file mode 100644
index 000000000000..7e0f42acb737
--- /dev/null
+++ b/drivers/lightnvm/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for Open-Channel SSDs.
+#
+
+obj-$(CONFIG_NVM)               := core.o
+obj-$(CONFIG_NVM_GENNVM)        += gennvm.o
+obj-$(CONFIG_NVM_RRPC)          += rrpc.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);
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
new file mode 100644
index 000000000000..ae1fb2bdc5f4
--- /dev/null
+++ b/drivers/lightnvm/gennvm.c
@@ -0,0 +1,485 @@
+/*
+ * Copyright (C) 2015 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.
+ *
+ * Implementation of a generic nvm manager for Open-Channel SSDs.
+ */
+
+#include "gennvm.h"
+
+static void gennvm_blocks_free(struct nvm_dev *dev)
+{
+        struct gen_nvm *gn = dev->mp;
+        struct gen_lun *lun;
+        int i;
+
+        gennvm_for_each_lun(gn, lun, i) {
+                if (!lun->vlun.blocks)
+                        break;
+                vfree(lun->vlun.blocks);
+        }
+}
+
+static void gennvm_luns_free(struct nvm_dev *dev)
+{
+        struct gen_nvm *gn = dev->mp;
+
+        kfree(gn->luns);
+}
+
+static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn)
+{
+        struct gen_lun *lun;
+        int i;
+
+        gn->luns = kcalloc(dev->nr_luns, sizeof(struct gen_lun), GFP_KERNEL);
+        if (!gn->luns)
+                return -ENOMEM;
+
+        gennvm_for_each_lun(gn, lun, i) {
+                spin_lock_init(&lun->vlun.lock);
+                INIT_LIST_HEAD(&lun->free_list);
+                INIT_LIST_HEAD(&lun->used_list);
+                INIT_LIST_HEAD(&lun->bb_list);
+
+                lun->reserved_blocks = 2; /* for GC only */
+                lun->vlun.id = i;
+                lun->vlun.lun_id = i % dev->luns_per_chnl;
+                lun->vlun.chnl_id = i / dev->luns_per_chnl;
+                lun->vlun.nr_free_blocks = dev->blks_per_lun;
+        }
+        return 0;
+}
+
+static int gennvm_block_bb(u32 lun_id, void *bb_bitmap, unsigned int nr_blocks,
+                                                                void *private)
+{
+        struct gen_nvm *gn = private;
+        struct gen_lun *lun = &gn->luns[lun_id];
+        struct nvm_block *blk;
+        int i;
+
+        if (unlikely(bitmap_empty(bb_bitmap, nr_blocks)))
+                return 0;
+
+        i = -1;
+        while ((i = find_next_bit(bb_bitmap, nr_blocks, i + 1)) < nr_blocks) {
+                blk = &lun->vlun.blocks[i];
+                if (!blk) {
+                        pr_err("gennvm: BB data is out of bounds.\n");
+                        return -EINVAL;
+                }
+
+                list_move_tail(&blk->list, &lun->bb_list);
+        }
+
+        return 0;
+}
+
+static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
+{
+        struct nvm_dev *dev = private;
+        struct gen_nvm *gn = dev->mp;
+        sector_t max_pages = dev->total_pages * (dev->sec_size >> 9);
+        u64 elba = slba + nlb;
+        struct gen_lun *lun;
+        struct nvm_block *blk;
+        u64 i;
+        int lun_id;
+
+        if (unlikely(elba > dev->total_pages)) {
+                pr_err("gennvm: L2P data from device is out of bounds!\n");
+                return -EINVAL;
+        }
+
+        for (i = 0; i < nlb; i++) {
+                u64 pba = le64_to_cpu(entries[i]);
+
+                if (unlikely(pba >= max_pages && pba != U64_MAX)) {
+                        pr_err("gennvm: L2P data entry is out of bounds!\n");
+                        return -EINVAL;
+                }
+
+                /* Address zero is a special one. The first page on a disk is
+                 * protected. It often holds internal device boot
+                 * information.
+                 */
+                if (!pba)
+                        continue;
+
+                /* resolve block from physical address */
+                lun_id = div_u64(pba, dev->sec_per_lun);
+                lun = &gn->luns[lun_id];
+
+                /* Calculate block offset into lun */
+                pba = pba - (dev->sec_per_lun * lun_id);
+                blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];
+
+                if (!blk->type) {
+                        /* at this point, we don't know anything about the
+                         * block. It's up to the FTL on top to re-etablish the
+                         * block state
+                         */
+                        list_move_tail(&blk->list, &lun->used_list);
+                        blk->type = 1;
+                        lun->vlun.nr_free_blocks--;
+                }
+        }
+
+        return 0;
+}
+
+static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
+{
+        struct gen_lun *lun;
+        struct nvm_block *block;
+        sector_t lun_iter, blk_iter, cur_block_id = 0;
+        int ret;
+
+        gennvm_for_each_lun(gn, lun, lun_iter) {
+                lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) *
+                                                        dev->blks_per_lun);
+                if (!lun->vlun.blocks)
+                        return -ENOMEM;
+
+                for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) {
+                        block = &lun->vlun.blocks[blk_iter];
+
+                        INIT_LIST_HEAD(&block->list);
+
+                        block->lun = &lun->vlun;
+                        block->id = cur_block_id++;
+
+                        /* First block is reserved for device */
+                        if (unlikely(lun_iter == 0 && blk_iter == 0))
+                                continue;
+
+                        list_add_tail(&block->list, &lun->free_list);
+                }
+
+                if (dev->ops->get_bb_tbl) {
+                        ret = dev->ops->get_bb_tbl(dev->q, lun->vlun.id,
+                                        dev->blks_per_lun, gennvm_block_bb, gn);
+                        if (ret)
+                                pr_err("gennvm: could not read BB table\n");
+                }
+        }
+
+        if (dev->ops->get_l2p_tbl) {
+                ret = dev->ops->get_l2p_tbl(dev->q, 0, dev->total_pages,
+                                                        gennvm_block_map, dev);
+                if (ret) {
+                        pr_err("gennvm: could not read L2P table.\n");
+                        pr_warn("gennvm: default block initialization");
+                }
+        }
+
+        return 0;
+}
+
+static int gennvm_register(struct nvm_dev *dev)
+{
+        struct gen_nvm *gn;
+        int ret;
+
+        gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL);
+        if (!gn)
+                return -ENOMEM;
+
+        gn->nr_luns = dev->nr_luns;
+        dev->mp = gn;
+
+        ret = gennvm_luns_init(dev, gn);
+        if (ret) {
+                pr_err("gennvm: could not initialize luns\n");
+                goto err;
+        }
+
+        ret = gennvm_blocks_init(dev, gn);
+        if (ret) {
+                pr_err("gennvm: could not initialize blocks\n");
+                goto err;
+        }
+
+        return 1;
+err:
+        kfree(gn);
+        return ret;
+}
+
+static void gennvm_unregister(struct nvm_dev *dev)
+{
+        gennvm_blocks_free(dev);
+        gennvm_luns_free(dev);
+        kfree(dev->mp);
+        dev->mp = NULL;
+}
+
+static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
+                                struct nvm_lun *vlun, unsigned long flags)
+{
+        struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
+        struct nvm_block *blk = NULL;
+        int is_gc = flags & NVM_IOTYPE_GC;
+
+        spin_lock(&vlun->lock);
+
+        if (list_empty(&lun->free_list)) {
+                pr_err_ratelimited("gennvm: lun %u have no free pages available",
+                                                                lun->vlun.id);
+                spin_unlock(&vlun->lock);
+                goto out;
+        }
+
+        while (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks) {
+                spin_unlock(&vlun->lock);
+                goto out;
+        }
+
+        blk = list_first_entry(&lun->free_list, struct nvm_block, list);
+        list_move_tail(&blk->list, &lun->used_list);
+        blk->type = 1;
+
+        lun->vlun.nr_free_blocks--;
+
+        spin_unlock(&vlun->lock);
+out:
+        return blk;
+}
+
+static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
+{
+        struct nvm_lun *vlun = blk->lun;
+        struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
+
+        spin_lock(&vlun->lock);
+
+        switch (blk->type) {
+        case 1:
+                list_move_tail(&blk->list, &lun->free_list);
+                lun->vlun.nr_free_blocks++;
+                blk->type = 0;
+                break;
+        case 2:
+                list_move_tail(&blk->list, &lun->bb_list);
+                break;
+        default:
+                WARN_ON_ONCE(1);
+                pr_err("gennvm: erroneous block type (%lu -> %u)\n",
+                                                        blk->id, blk->type);
+                list_move_tail(&blk->list, &lun->bb_list);
+        }
+
+        spin_unlock(&vlun->lock);
+}
+
+static void gennvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+        int i;
+
+        if (rqd->nr_pages > 1) {
+                for (i = 0; i < rqd->nr_pages; i++)
+                        rqd->ppa_list[i] = addr_to_generic_mode(dev,
+                                                        rqd->ppa_list[i]);
+        } else {
+                rqd->ppa_addr = addr_to_generic_mode(dev, rqd->ppa_addr);
+        }
+}
+
+static void gennvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+        int i;
+
+        if (rqd->nr_pages > 1) {
+                for (i = 0; i < rqd->nr_pages; i++)
+                        rqd->ppa_list[i] = generic_to_addr_mode(dev,
+                                                        rqd->ppa_list[i]);
+        } else {
+                rqd->ppa_addr = generic_to_addr_mode(dev, rqd->ppa_addr);
+        }
+}
+
+static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+        if (!dev->ops->submit_io)
+                return 0;
+
+        /* Convert address space */
+        gennvm_generic_to_addr_mode(dev, rqd);
+
+        rqd->dev = dev;
+        return dev->ops->submit_io(dev->q, rqd);
+}
+
+static void gennvm_blk_set_type(struct nvm_dev *dev, struct ppa_addr *ppa,
+                                                                int type)
+{
+        struct gen_nvm *gn = dev->mp;
+        struct gen_lun *lun;
+        struct nvm_block *blk;
+
+        if (unlikely(ppa->g.ch > dev->nr_chnls ||
+                                        ppa->g.lun > dev->luns_per_chnl ||
+                                        ppa->g.blk > dev->blks_per_lun)) {
+                WARN_ON_ONCE(1);
+                pr_err("gennvm: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u",
+                                ppa->g.ch, dev->nr_chnls,
+                                ppa->g.lun, dev->luns_per_chnl,
+                                ppa->g.blk, dev->blks_per_lun);
+                return;
+        }
+
+        lun = &gn->luns[ppa->g.lun * ppa->g.ch];
+        blk = &lun->vlun.blocks[ppa->g.blk];
+
+        /* will be moved to bb list on put_blk from target */
+        blk->type = type;
+}
+
+/* mark block bad. It is expected the target recover from the error. */
+static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+        int i;
+
+        if (!dev->ops->set_bb)
+                return;
+
+        if (dev->ops->set_bb(dev->q, rqd, 1))
+                return;
+
+        gennvm_addr_to_generic_mode(dev, rqd);
+
+        /* look up blocks and mark them as bad */
+        if (rqd->nr_pages > 1)
+                for (i = 0; i < rqd->nr_pages; i++)
+                        gennvm_blk_set_type(dev, &rqd->ppa_list[i], 2);
+        else
+                gennvm_blk_set_type(dev, &rqd->ppa_addr, 2);
+}
+
+static int gennvm_end_io(struct nvm_rq *rqd, int error)
+{
+        struct nvm_tgt_instance *ins = rqd->ins;
+        int ret = 0;
+
+        switch (error) {
+        case NVM_RSP_SUCCESS:
+                break;
+        case NVM_RSP_ERR_EMPTYPAGE:
+                break;
+        case NVM_RSP_ERR_FAILWRITE:
+                gennvm_mark_blk_bad(rqd->dev, rqd);
+        default:
+                ret++;
+        }
+
+        ret += ins->tt->end_io(rqd, error);
+
+        return ret;
+}
+
+static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
+                                                        unsigned long flags)
+{
+        int plane_cnt = 0, pl_idx, ret;
+        struct ppa_addr addr;
+        struct nvm_rq rqd;
+
+        if (!dev->ops->erase_block)
+                return 0;
+
+        addr = block_to_ppa(dev, blk);
+
+        if (dev->plane_mode == NVM_PLANE_SINGLE) {
+                rqd.nr_pages = 1;
+                rqd.ppa_addr = addr;
+        } else {
+                plane_cnt = (1 << dev->plane_mode);
+                rqd.nr_pages = plane_cnt;
+
+                rqd.ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL,
+                                                        &rqd.dma_ppa_list);
+                if (!rqd.ppa_list) {
+                        pr_err("gennvm: failed to allocate dma memory\n");
+                        return -ENOMEM;
+                }
+
+                for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
+                        addr.g.pl = pl_idx;
+                        rqd.ppa_list[pl_idx] = addr;
+                }
+        }
+
+        gennvm_generic_to_addr_mode(dev, &rqd);
+
+        ret = dev->ops->erase_block(dev->q, &rqd);
+
+        if (plane_cnt)
+                nvm_dev_dma_free(dev, rqd.ppa_list, rqd.dma_ppa_list);
+
+        return ret;
+}
+
+static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
+{
+        struct gen_nvm *gn = dev->mp;
+
+        return &gn->luns[lunid].vlun;
+}
+
+static void gennvm_free_blocks_print(struct nvm_dev *dev)
+{
+        struct gen_nvm *gn = dev->mp;
+        struct gen_lun *lun;
+        unsigned int i;
+
+        gennvm_for_each_lun(gn, lun, i)
+                pr_info("%s: lun%8u\t%u\n",
+                                        dev->name, i, lun->vlun.nr_free_blocks);
+}
+
+static struct nvmm_type gennvm = {
+        .name           = "gennvm",
+        .version        = {0, 1, 0},
+
+        .register_mgr   = gennvm_register,
+        .unregister_mgr = gennvm_unregister,
+
+        .get_blk        = gennvm_get_blk,
+        .put_blk        = gennvm_put_blk,
+
+        .submit_io      = gennvm_submit_io,
+        .end_io         = gennvm_end_io,
+        .erase_blk      = gennvm_erase_blk,
+
+        .get_lun        = gennvm_get_lun,
+        .free_blocks_print = gennvm_free_blocks_print,
+};
+
+static int __init gennvm_module_init(void)
+{
+        return nvm_register_mgr(&gennvm);
+}
+
+static void gennvm_module_exit(void)
+{
+        nvm_unregister_mgr(&gennvm);
+}
+
+module_init(gennvm_module_init);
+module_exit(gennvm_module_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Generic media manager for Open-Channel SSDs");
diff --git a/drivers/lightnvm/gennvm.h b/drivers/lightnvm/gennvm.h
new file mode 100644
index 000000000000..d23bd3501ddc
--- /dev/null
+++ b/drivers/lightnvm/gennvm.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright: Matias Bjorling <mb@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.
+ *
+ */
+
+#ifndef GENNVM_H_
+#define GENNVM_H_
+
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+
+#include <linux/lightnvm.h>
+
+struct gen_lun {
+        struct nvm_lun vlun;
+
+        int reserved_blocks;
+        /* lun block lists */
+        struct list_head used_list;     /* In-use blocks */
+        struct list_head free_list;     /* Not used blocks i.e. released
+                                         * and ready for use
+                                         */
+        struct list_head bb_list;       /* Bad blocks. Mutually exclusive with
+                                         * free_list and used_list
+                                         */
+};
+
+struct gen_nvm {
+        int nr_luns;
+        struct gen_lun *luns;
+};
+
+#define gennvm_for_each_lun(bm, lun, i) \
+                for ((i) = 0, lun = &(bm)->luns[0]; \
+                        (i) < (bm)->nr_luns; (i)++, lun = &(bm)->luns[(i)])
+
+#endif /* GENNVM_H_ */
diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
new file mode 100644
index 000000000000..64a888a5e9b3
--- /dev/null
+++ b/drivers/lightnvm/rrpc.c
@@ -0,0 +1,1323 @@
+/*
+ * Copyright (C) 2015 IT University of Copenhagen
+ * 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.
+ *
+ * Implementation of a Round-robin page-based Hybrid FTL for Open-channel SSDs.
+ */
+
+#include "rrpc.h"
+
+static struct kmem_cache *rrpc_gcb_cache, *rrpc_rq_cache;
+static DECLARE_RWSEM(rrpc_lock);
+
+static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
+                                struct nvm_rq *rqd, unsigned long flags);
+
+#define rrpc_for_each_lun(rrpc, rlun, i) \
+                for ((i) = 0, rlun = &(rrpc)->luns[0]; \
+                        (i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)])
+
+static void rrpc_page_invalidate(struct rrpc *rrpc, struct rrpc_addr *a)
+{
+        struct rrpc_block *rblk = a->rblk;
+        unsigned int pg_offset;
+
+        lockdep_assert_held(&rrpc->rev_lock);
+
+        if (a->addr == ADDR_EMPTY || !rblk)
+                return;
+
+        spin_lock(&rblk->lock);
+
+        div_u64_rem(a->addr, rrpc->dev->pgs_per_blk, &pg_offset);
+        WARN_ON(test_and_set_bit(pg_offset, rblk->invalid_pages));
+        rblk->nr_invalid_pages++;
+
+        spin_unlock(&rblk->lock);
+
+        rrpc->rev_trans_map[a->addr - rrpc->poffset].addr = ADDR_EMPTY;
+}
+
+static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba,
+                                                                unsigned len)
+{
+        sector_t i;
+
+        spin_lock(&rrpc->rev_lock);
+        for (i = slba; i < slba + len; i++) {
+                struct rrpc_addr *gp = &rrpc->trans_map[i];
+
+                rrpc_page_invalidate(rrpc, gp);
+                gp->rblk = NULL;
+        }
+        spin_unlock(&rrpc->rev_lock);
+}
+
+static struct nvm_rq *rrpc_inflight_laddr_acquire(struct rrpc *rrpc,
+                                        sector_t laddr, unsigned int pages)
+{
+        struct nvm_rq *rqd;
+        struct rrpc_inflight_rq *inf;
+
+        rqd = mempool_alloc(rrpc->rq_pool, GFP_ATOMIC);
+        if (!rqd)
+                return ERR_PTR(-ENOMEM);
+
+        inf = rrpc_get_inflight_rq(rqd);
+        if (rrpc_lock_laddr(rrpc, laddr, pages, inf)) {
+                mempool_free(rqd, rrpc->rq_pool);
+                return NULL;
+        }
+
+        return rqd;
+}
+
+static void rrpc_inflight_laddr_release(struct rrpc *rrpc, struct nvm_rq *rqd)
+{
+        struct rrpc_inflight_rq *inf = rrpc_get_inflight_rq(rqd);
+
+        rrpc_unlock_laddr(rrpc, inf);
+
+        mempool_free(rqd, rrpc->rq_pool);
+}
+
+static void rrpc_discard(struct rrpc *rrpc, struct bio *bio)
+{
+        sector_t slba = bio->bi_iter.bi_sector / NR_PHY_IN_LOG;
+        sector_t len = bio->bi_iter.bi_size / RRPC_EXPOSED_PAGE_SIZE;
+        struct nvm_rq *rqd;
+
+        do {
+                rqd = rrpc_inflight_laddr_acquire(rrpc, slba, len);
+                schedule();
+        } while (!rqd);
+
+        if (IS_ERR(rqd)) {
+                pr_err("rrpc: unable to acquire inflight IO\n");
+                bio_io_error(bio);
+                return;
+        }
+
+        rrpc_invalidate_range(rrpc, slba, len);
+        rrpc_inflight_laddr_release(rrpc, rqd);
+}
+
+static int block_is_full(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        return (rblk->next_page == rrpc->dev->pgs_per_blk);
+}
+
+static u64 block_to_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        struct nvm_block *blk = rblk->parent;
+
+        return blk->id * rrpc->dev->pgs_per_blk;
+}
+
+static struct ppa_addr rrpc_ppa_to_gaddr(struct nvm_dev *dev, u64 addr)
+{
+        struct ppa_addr paddr;
+
+        paddr.ppa = addr;
+        return __linear_to_generic_addr(dev, paddr);
+}
+
+/* requires lun->lock taken */
+static void rrpc_set_lun_cur(struct rrpc_lun *rlun, struct rrpc_block *rblk)
+{
+        struct rrpc *rrpc = rlun->rrpc;
+
+        BUG_ON(!rblk);
+
+        if (rlun->cur) {
+                spin_lock(&rlun->cur->lock);
+                WARN_ON(!block_is_full(rrpc, rlun->cur));
+                spin_unlock(&rlun->cur->lock);
+        }
+        rlun->cur = rblk;
+}
+
+static struct rrpc_block *rrpc_get_blk(struct rrpc *rrpc, struct rrpc_lun *rlun,
+                                                        unsigned long flags)
+{
+        struct nvm_block *blk;
+        struct rrpc_block *rblk;
+
+        blk = nvm_get_blk(rrpc->dev, rlun->parent, 0);
+        if (!blk)
+                return NULL;
+
+        rblk = &rlun->blocks[blk->id];
+        blk->priv = rblk;
+
+        bitmap_zero(rblk->invalid_pages, rrpc->dev->pgs_per_blk);
+        rblk->next_page = 0;
+        rblk->nr_invalid_pages = 0;
+        atomic_set(&rblk->data_cmnt_size, 0);
+
+        return rblk;
+}
+
+static void rrpc_put_blk(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        nvm_put_blk(rrpc->dev, rblk->parent);
+}
+
+static struct rrpc_lun *get_next_lun(struct rrpc *rrpc)
+{
+        int next = atomic_inc_return(&rrpc->next_lun);
+
+        return &rrpc->luns[next % rrpc->nr_luns];
+}
+
+static void rrpc_gc_kick(struct rrpc *rrpc)
+{
+        struct rrpc_lun *rlun;
+        unsigned int i;
+
+        for (i = 0; i < rrpc->nr_luns; i++) {
+                rlun = &rrpc->luns[i];
+                queue_work(rrpc->krqd_wq, &rlun->ws_gc);
+        }
+}
+
+/*
+ * timed GC every interval.
+ */
+static void rrpc_gc_timer(unsigned long data)
+{
+        struct rrpc *rrpc = (struct rrpc *)data;
+
+        rrpc_gc_kick(rrpc);
+        mod_timer(&rrpc->gc_timer, jiffies + msecs_to_jiffies(10));
+}
+
+static void rrpc_end_sync_bio(struct bio *bio)
+{
+        struct completion *waiting = bio->bi_private;
+
+        if (bio->bi_error)
+                pr_err("nvm: gc request failed (%u).\n", bio->bi_error);
+
+        complete(waiting);
+}
+
+/*
+ * rrpc_move_valid_pages -- migrate live data off the block
+ * @rrpc: the 'rrpc' structure
+ * @block: the block from which to migrate live pages
+ *
+ * Description:
+ *   GC algorithms may call this function to migrate remaining live
+ *   pages off the block prior to erasing it. This function blocks
+ *   further execution until the operation is complete.
+ */
+static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        struct request_queue *q = rrpc->dev->q;
+        struct rrpc_rev_addr *rev;
+        struct nvm_rq *rqd;
+        struct bio *bio;
+        struct page *page;
+        int slot;
+        int nr_pgs_per_blk = rrpc->dev->pgs_per_blk;
+        u64 phys_addr;
+        DECLARE_COMPLETION_ONSTACK(wait);
+
+        if (bitmap_full(rblk->invalid_pages, nr_pgs_per_blk))
+                return 0;
+
+        bio = bio_alloc(GFP_NOIO, 1);
+        if (!bio) {
+                pr_err("nvm: could not alloc bio to gc\n");
+                return -ENOMEM;
+        }
+
+        page = mempool_alloc(rrpc->page_pool, GFP_NOIO);
+
+        while ((slot = find_first_zero_bit(rblk->invalid_pages,
+                                            nr_pgs_per_blk)) < nr_pgs_per_blk) {
+
+                /* Lock laddr */
+                phys_addr = (rblk->parent->id * nr_pgs_per_blk) + slot;
+
+try:
+                spin_lock(&rrpc->rev_lock);
+                /* Get logical address from physical to logical table */
+                rev = &rrpc->rev_trans_map[phys_addr - rrpc->poffset];
+                /* already updated by previous regular write */
+                if (rev->addr == ADDR_EMPTY) {
+                        spin_unlock(&rrpc->rev_lock);
+                        continue;
+                }
+
+                rqd = rrpc_inflight_laddr_acquire(rrpc, rev->addr, 1);
+                if (IS_ERR_OR_NULL(rqd)) {
+                        spin_unlock(&rrpc->rev_lock);
+                        schedule();
+                        goto try;
+                }
+
+                spin_unlock(&rrpc->rev_lock);
+
+                /* Perform read to do GC */
+                bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr);
+                bio->bi_rw = READ;
+                bio->bi_private = &wait;
+                bio->bi_end_io = rrpc_end_sync_bio;
+
+                /* TODO: may fail when EXP_PG_SIZE > PAGE_SIZE */
+                bio_add_pc_page(q, bio, page, RRPC_EXPOSED_PAGE_SIZE, 0);
+
+                if (rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_GC)) {
+                        pr_err("rrpc: gc read failed.\n");
+                        rrpc_inflight_laddr_release(rrpc, rqd);
+                        goto finished;
+                }
+                wait_for_completion_io(&wait);
+
+                bio_reset(bio);
+                reinit_completion(&wait);
+
+                bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr);
+                bio->bi_rw = WRITE;
+                bio->bi_private = &wait;
+                bio->bi_end_io = rrpc_end_sync_bio;
+
+                bio_add_pc_page(q, bio, page, RRPC_EXPOSED_PAGE_SIZE, 0);
+
+                /* turn the command around and write the data back to a new
+                 * address
+                 */
+                if (rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_GC)) {
+                        pr_err("rrpc: gc write failed.\n");
+                        rrpc_inflight_laddr_release(rrpc, rqd);
+                        goto finished;
+                }
+                wait_for_completion_io(&wait);
+
+                rrpc_inflight_laddr_release(rrpc, rqd);
+
+                bio_reset(bio);
+        }
+
+finished:
+        mempool_free(page, rrpc->page_pool);
+        bio_put(bio);
+
+        if (!bitmap_full(rblk->invalid_pages, nr_pgs_per_blk)) {
+                pr_err("nvm: failed to garbage collect block\n");
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static void rrpc_block_gc(struct work_struct *work)
+{
+        struct rrpc_block_gc *gcb = container_of(work, struct rrpc_block_gc,
+                                                                        ws_gc);
+        struct rrpc *rrpc = gcb->rrpc;
+        struct rrpc_block *rblk = gcb->rblk;
+        struct nvm_dev *dev = rrpc->dev;
+
+        pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id);
+
+        if (rrpc_move_valid_pages(rrpc, rblk))
+                goto done;
+
+        nvm_erase_blk(dev, rblk->parent);
+        rrpc_put_blk(rrpc, rblk);
+done:
+        mempool_free(gcb, rrpc->gcb_pool);
+}
+
+/* the block with highest number of invalid pages, will be in the beginning
+ * of the list
+ */
+static struct rrpc_block *rblock_max_invalid(struct rrpc_block *ra,
+                                                        struct rrpc_block *rb)
+{
+        if (ra->nr_invalid_pages == rb->nr_invalid_pages)
+                return ra;
+
+        return (ra->nr_invalid_pages < rb->nr_invalid_pages) ? rb : ra;
+}
+
+/* linearly find the block with highest number of invalid pages
+ * requires lun->lock
+ */
+static struct rrpc_block *block_prio_find_max(struct rrpc_lun *rlun)
+{
+        struct list_head *prio_list = &rlun->prio_list;
+        struct rrpc_block *rblock, *max;
+
+        BUG_ON(list_empty(prio_list));
+
+        max = list_first_entry(prio_list, struct rrpc_block, prio);
+        list_for_each_entry(rblock, prio_list, prio)
+                max = rblock_max_invalid(max, rblock);
+
+        return max;
+}
+
+static void rrpc_lun_gc(struct work_struct *work)
+{
+        struct rrpc_lun *rlun = container_of(work, struct rrpc_lun, ws_gc);
+        struct rrpc *rrpc = rlun->rrpc;
+        struct nvm_lun *lun = rlun->parent;
+        struct rrpc_block_gc *gcb;
+        unsigned int nr_blocks_need;
+
+        nr_blocks_need = rrpc->dev->blks_per_lun / GC_LIMIT_INVERSE;
+
+        if (nr_blocks_need < rrpc->nr_luns)
+                nr_blocks_need = rrpc->nr_luns;
+
+        spin_lock(&lun->lock);
+        while (nr_blocks_need > lun->nr_free_blocks &&
+                                        !list_empty(&rlun->prio_list)) {
+                struct rrpc_block *rblock = block_prio_find_max(rlun);
+                struct nvm_block *block = rblock->parent;
+
+                if (!rblock->nr_invalid_pages)
+                        break;
+
+                list_del_init(&rblock->prio);
+
+                BUG_ON(!block_is_full(rrpc, rblock));
+
+                pr_debug("rrpc: selected block '%lu' for GC\n", block->id);
+
+                gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
+                if (!gcb)
+                        break;
+
+                gcb->rrpc = rrpc;
+                gcb->rblk = rblock;
+                INIT_WORK(&gcb->ws_gc, rrpc_block_gc);
+
+                queue_work(rrpc->kgc_wq, &gcb->ws_gc);
+
+                nr_blocks_need--;
+        }
+        spin_unlock(&lun->lock);
+
+        /* TODO: Hint that request queue can be started again */
+}
+
+static void rrpc_gc_queue(struct work_struct *work)
+{
+        struct rrpc_block_gc *gcb = container_of(work, struct rrpc_block_gc,
+                                                                        ws_gc);
+        struct rrpc *rrpc = gcb->rrpc;
+        struct rrpc_block *rblk = gcb->rblk;
+        struct nvm_lun *lun = rblk->parent->lun;
+        struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
+
+        spin_lock(&rlun->lock);
+        list_add_tail(&rblk->prio, &rlun->prio_list);
+        spin_unlock(&rlun->lock);
+
+        mempool_free(gcb, rrpc->gcb_pool);
+        pr_debug("nvm: block '%lu' is full, allow GC (sched)\n",
+                                                        rblk->parent->id);
+}
+
+static const struct block_device_operations rrpc_fops = {
+        .owner          = THIS_MODULE,
+};
+
+static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc)
+{
+        unsigned int i;
+        struct rrpc_lun *rlun, *max_free;
+
+        if (!is_gc)
+                return get_next_lun(rrpc);
+
+        /* during GC, we don't care about RR, instead we want to make
+         * sure that we maintain evenness between the block luns.
+         */
+        max_free = &rrpc->luns[0];
+        /* prevent GC-ing lun from devouring pages of a lun with
+         * little free blocks. We don't take the lock as we only need an
+         * estimate.
+         */
+        rrpc_for_each_lun(rrpc, rlun, i) {
+                if (rlun->parent->nr_free_blocks >
+                                        max_free->parent->nr_free_blocks)
+                        max_free = rlun;
+        }
+
+        return max_free;
+}
+
+static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr,
+                                        struct rrpc_block *rblk, u64 paddr)
+{
+        struct rrpc_addr *gp;
+        struct rrpc_rev_addr *rev;
+
+        BUG_ON(laddr >= rrpc->nr_pages);
+
+        gp = &rrpc->trans_map[laddr];
+        spin_lock(&rrpc->rev_lock);
+        if (gp->rblk)
+                rrpc_page_invalidate(rrpc, gp);
+
+        gp->addr = paddr;
+        gp->rblk = rblk;
+
+        rev = &rrpc->rev_trans_map[gp->addr - rrpc->poffset];
+        rev->addr = laddr;
+        spin_unlock(&rrpc->rev_lock);
+
+        return gp;
+}
+
+static u64 rrpc_alloc_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        u64 addr = ADDR_EMPTY;
+
+        spin_lock(&rblk->lock);
+        if (block_is_full(rrpc, rblk))
+                goto out;
+
+        addr = block_to_addr(rrpc, rblk) + rblk->next_page;
+
+        rblk->next_page++;
+out:
+        spin_unlock(&rblk->lock);
+        return addr;
+}
+
+/* Simple round-robin Logical to physical address translation.
+ *
+ * Retrieve the mapping using the active append point. Then update the ap for
+ * the next write to the disk.
+ *
+ * Returns rrpc_addr with the physical address and block. Remember to return to
+ * rrpc->addr_cache when request is finished.
+ */
+static struct rrpc_addr *rrpc_map_page(struct rrpc *rrpc, sector_t laddr,
+                                                                int is_gc)
+{
+        struct rrpc_lun *rlun;
+        struct rrpc_block *rblk;
+        struct nvm_lun *lun;
+        u64 paddr;
+
+        rlun = rrpc_get_lun_rr(rrpc, is_gc);
+        lun = rlun->parent;
+
+        if (!is_gc && lun->nr_free_blocks < rrpc->nr_luns * 4)
+                return NULL;
+
+        spin_lock(&rlun->lock);
+
+        rblk = rlun->cur;
+retry:
+        paddr = rrpc_alloc_addr(rrpc, rblk);
+
+        if (paddr == ADDR_EMPTY) {
+                rblk = rrpc_get_blk(rrpc, rlun, 0);
+                if (rblk) {
+                        rrpc_set_lun_cur(rlun, rblk);
+                        goto retry;
+                }
+
+                if (is_gc) {
+                        /* retry from emergency gc block */
+                        paddr = rrpc_alloc_addr(rrpc, rlun->gc_cur);
+                        if (paddr == ADDR_EMPTY) {
+                                rblk = rrpc_get_blk(rrpc, rlun, 1);
+                                if (!rblk) {
+                                        pr_err("rrpc: no more blocks");
+                                        goto err;
+                                }
+
+                                rlun->gc_cur = rblk;
+                                paddr = rrpc_alloc_addr(rrpc, rlun->gc_cur);
+                        }
+                        rblk = rlun->gc_cur;
+                }
+        }
+
+        spin_unlock(&rlun->lock);
+        return rrpc_update_map(rrpc, laddr, rblk, paddr);
+err:
+        spin_unlock(&rlun->lock);
+        return NULL;
+}
+
+static void rrpc_run_gc(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        struct rrpc_block_gc *gcb;
+
+        gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
+        if (!gcb) {
+                pr_err("rrpc: unable to queue block for gc.");
+                return;
+        }
+
+        gcb->rrpc = rrpc;
+        gcb->rblk = rblk;
+
+        INIT_WORK(&gcb->ws_gc, rrpc_gc_queue);
+        queue_work(rrpc->kgc_wq, &gcb->ws_gc);
+}
+
+static void rrpc_end_io_write(struct rrpc *rrpc, struct rrpc_rq *rrqd,
+                                                sector_t laddr, uint8_t npages)
+{
+        struct rrpc_addr *p;
+        struct rrpc_block *rblk;
+        struct nvm_lun *lun;
+        int cmnt_size, i;
+
+        for (i = 0; i < npages; i++) {
+                p = &rrpc->trans_map[laddr + i];
+                rblk = p->rblk;
+                lun = rblk->parent->lun;
+
+                cmnt_size = atomic_inc_return(&rblk->data_cmnt_size);
+                if (unlikely(cmnt_size == rrpc->dev->pgs_per_blk))
+                        rrpc_run_gc(rrpc, rblk);
+        }
+}
+
+static int rrpc_end_io(struct nvm_rq *rqd, int error)
+{
+        struct rrpc *rrpc = container_of(rqd->ins, struct rrpc, instance);
+        struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
+        uint8_t npages = rqd->nr_pages;
+        sector_t laddr = rrpc_get_laddr(rqd->bio) - npages;
+
+        if (bio_data_dir(rqd->bio) == WRITE)
+                rrpc_end_io_write(rrpc, rrqd, laddr, npages);
+
+        if (rrqd->flags & NVM_IOTYPE_GC)
+                return 0;
+
+        rrpc_unlock_rq(rrpc, rqd);
+        bio_put(rqd->bio);
+
+        if (npages > 1)
+                nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list);
+        if (rqd->metadata)
+                nvm_dev_dma_free(rrpc->dev, rqd->metadata, rqd->dma_metadata);
+
+        mempool_free(rqd, rrpc->rq_pool);
+
+        return 0;
+}
+
+static int rrpc_read_ppalist_rq(struct rrpc *rrpc, struct bio *bio,
+                        struct nvm_rq *rqd, unsigned long flags, int npages)
+{
+        struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
+        struct rrpc_addr *gp;
+        sector_t laddr = rrpc_get_laddr(bio);
+        int is_gc = flags & NVM_IOTYPE_GC;
+        int i;
+
+        if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) {
+                nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list);
+                return NVM_IO_REQUEUE;
+        }
+
+        for (i = 0; i < npages; i++) {
+                /* We assume that mapping occurs at 4KB granularity */
+                BUG_ON(!(laddr + i >= 0 && laddr + i < rrpc->nr_pages));
+                gp = &rrpc->trans_map[laddr + i];
+
+                if (gp->rblk) {
+                        rqd->ppa_list[i] = rrpc_ppa_to_gaddr(rrpc->dev,
+                                                                gp->addr);
+                } else {
+                        BUG_ON(is_gc);
+                        rrpc_unlock_laddr(rrpc, r);
+                        nvm_dev_dma_free(rrpc->dev, rqd->ppa_list,
+                                                        rqd->dma_ppa_list);
+                        return NVM_IO_DONE;
+                }
+        }
+
+        rqd->opcode = NVM_OP_HBREAD;
+
+        return NVM_IO_OK;
+}
+
+static int rrpc_read_rq(struct rrpc *rrpc, struct bio *bio, struct nvm_rq *rqd,
+                                                        unsigned long flags)
+{
+        struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
+        int is_gc = flags & NVM_IOTYPE_GC;
+        sector_t laddr = rrpc_get_laddr(bio);
+        struct rrpc_addr *gp;
+
+        if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd))
+                return NVM_IO_REQUEUE;
+
+        BUG_ON(!(laddr >= 0 && laddr < rrpc->nr_pages));
+        gp = &rrpc->trans_map[laddr];
+
+        if (gp->rblk) {
+                rqd->ppa_addr = rrpc_ppa_to_gaddr(rrpc->dev, gp->addr);
+        } else {
+                BUG_ON(is_gc);
+                rrpc_unlock_rq(rrpc, rqd);
+                return NVM_IO_DONE;
+        }
+
+        rqd->opcode = NVM_OP_HBREAD;
+        rrqd->addr = gp;
+
+        return NVM_IO_OK;
+}
+
+static int rrpc_write_ppalist_rq(struct rrpc *rrpc, struct bio *bio,
+                        struct nvm_rq *rqd, unsigned long flags, int npages)
+{
+        struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
+        struct rrpc_addr *p;
+        sector_t laddr = rrpc_get_laddr(bio);
+        int is_gc = flags & NVM_IOTYPE_GC;
+        int i;
+
+        if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) {
+                nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list);
+                return NVM_IO_REQUEUE;
+        }
+
+        for (i = 0; i < npages; i++) {
+                /* We assume that mapping occurs at 4KB granularity */
+                p = rrpc_map_page(rrpc, laddr + i, is_gc);
+                if (!p) {
+                        BUG_ON(is_gc);
+                        rrpc_unlock_laddr(rrpc, r);
+                        nvm_dev_dma_free(rrpc->dev, rqd->ppa_list,
+                                                        rqd->dma_ppa_list);
+                        rrpc_gc_kick(rrpc);
+                        return NVM_IO_REQUEUE;
+                }
+
+                rqd->ppa_list[i] = rrpc_ppa_to_gaddr(rrpc->dev,
+                                                                p->addr);
+        }
+
+        rqd->opcode = NVM_OP_HBWRITE;
+
+        return NVM_IO_OK;
+}
+
+static int rrpc_write_rq(struct rrpc *rrpc, struct bio *bio,
+                                struct nvm_rq *rqd, unsigned long flags)
+{
+        struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
+        struct rrpc_addr *p;
+        int is_gc = flags & NVM_IOTYPE_GC;
+        sector_t laddr = rrpc_get_laddr(bio);
+
+        if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd))
+                return NVM_IO_REQUEUE;
+
+        p = rrpc_map_page(rrpc, laddr, is_gc);
+        if (!p) {
+                BUG_ON(is_gc);
+                rrpc_unlock_rq(rrpc, rqd);
+                rrpc_gc_kick(rrpc);
+                return NVM_IO_REQUEUE;
+        }
+
+        rqd->ppa_addr = rrpc_ppa_to_gaddr(rrpc->dev, p->addr);
+        rqd->opcode = NVM_OP_HBWRITE;
+        rrqd->addr = p;
+
+        return NVM_IO_OK;
+}
+
+static int rrpc_setup_rq(struct rrpc *rrpc, struct bio *bio,
+                        struct nvm_rq *rqd, unsigned long flags, uint8_t npages)
+{
+        if (npages > 1) {
+                rqd->ppa_list = nvm_dev_dma_alloc(rrpc->dev, GFP_KERNEL,
+                                                        &rqd->dma_ppa_list);
+                if (!rqd->ppa_list) {
+                        pr_err("rrpc: not able to allocate ppa list\n");
+                        return NVM_IO_ERR;
+                }
+
+                if (bio_rw(bio) == WRITE)
+                        return rrpc_write_ppalist_rq(rrpc, bio, rqd, flags,
+                                                                        npages);
+
+                return rrpc_read_ppalist_rq(rrpc, bio, rqd, flags, npages);
+        }
+
+        if (bio_rw(bio) == WRITE)
+                return rrpc_write_rq(rrpc, bio, rqd, flags);
+
+        return rrpc_read_rq(rrpc, bio, rqd, flags);
+}
+
+static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
+                                struct nvm_rq *rqd, unsigned long flags)
+{
+        int err;
+        struct rrpc_rq *rrq = nvm_rq_to_pdu(rqd);
+        uint8_t nr_pages = rrpc_get_pages(bio);
+        int bio_size = bio_sectors(bio) << 9;
+
+        if (bio_size < rrpc->dev->sec_size)
+                return NVM_IO_ERR;
+        else if (bio_size > rrpc->dev->max_rq_size)
+                return NVM_IO_ERR;
+
+        err = rrpc_setup_rq(rrpc, bio, rqd, flags, nr_pages);
+        if (err)
+                return err;
+
+        bio_get(bio);
+        rqd->bio = bio;
+        rqd->ins = &rrpc->instance;
+        rqd->nr_pages = nr_pages;
+        rrq->flags = flags;
+
+        err = nvm_submit_io(rrpc->dev, rqd);
+        if (err) {
+                pr_err("rrpc: I/O submission failed: %d\n", err);
+                return NVM_IO_ERR;
+        }
+
+        return NVM_IO_OK;
+}
+
+static void rrpc_make_rq(struct request_queue *q, struct bio *bio)
+{
+        struct rrpc *rrpc = q->queuedata;
+        struct nvm_rq *rqd;
+        int err;
+
+        if (bio->bi_rw & REQ_DISCARD) {
+                rrpc_discard(rrpc, bio);
+                return;
+        }
+
+        rqd = mempool_alloc(rrpc->rq_pool, GFP_KERNEL);
+        if (!rqd) {
+                pr_err_ratelimited("rrpc: not able to queue bio.");
+                bio_io_error(bio);
+                return;
+        }
+        memset(rqd, 0, sizeof(struct nvm_rq));
+
+        err = rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_NONE);
+        switch (err) {
+        case NVM_IO_OK:
+                return;
+        case NVM_IO_ERR:
+                bio_io_error(bio);
+                break;
+        case NVM_IO_DONE:
+                bio_endio(bio);
+                break;
+        case NVM_IO_REQUEUE:
+                spin_lock(&rrpc->bio_lock);
+                bio_list_add(&rrpc->requeue_bios, bio);
+                spin_unlock(&rrpc->bio_lock);
+                queue_work(rrpc->kgc_wq, &rrpc->ws_requeue);
+                break;
+        }
+
+        mempool_free(rqd, rrpc->rq_pool);
+}
+
+static void rrpc_requeue(struct work_struct *work)
+{
+        struct rrpc *rrpc = container_of(work, struct rrpc, ws_requeue);
+        struct bio_list bios;
+        struct bio *bio;
+
+        bio_list_init(&bios);
+
+        spin_lock(&rrpc->bio_lock);
+        bio_list_merge(&bios, &rrpc->requeue_bios);
+        bio_list_init(&rrpc->requeue_bios);
+        spin_unlock(&rrpc->bio_lock);
+
+        while ((bio = bio_list_pop(&bios)))
+                rrpc_make_rq(rrpc->disk->queue, bio);
+}
+
+static void rrpc_gc_free(struct rrpc *rrpc)
+{
+        struct rrpc_lun *rlun;
+        int i;
+
+        if (rrpc->krqd_wq)
+                destroy_workqueue(rrpc->krqd_wq);
+
+        if (rrpc->kgc_wq)
+                destroy_workqueue(rrpc->kgc_wq);
+
+        if (!rrpc->luns)
+                return;
+
+        for (i = 0; i < rrpc->nr_luns; i++) {
+                rlun = &rrpc->luns[i];
+
+                if (!rlun->blocks)
+                        break;
+                vfree(rlun->blocks);
+        }
+}
+
+static int rrpc_gc_init(struct rrpc *rrpc)
+{
+        rrpc->krqd_wq = alloc_workqueue("rrpc-lun", WQ_MEM_RECLAIM|WQ_UNBOUND,
+                                                                rrpc->nr_luns);
+        if (!rrpc->krqd_wq)
+                return -ENOMEM;
+
+        rrpc->kgc_wq = alloc_workqueue("rrpc-bg", WQ_MEM_RECLAIM, 1);
+        if (!rrpc->kgc_wq)
+                return -ENOMEM;
+
+        setup_timer(&rrpc->gc_timer, rrpc_gc_timer, (unsigned long)rrpc);
+
+        return 0;
+}
+
+static void rrpc_map_free(struct rrpc *rrpc)
+{
+        vfree(rrpc->rev_trans_map);
+        vfree(rrpc->trans_map);
+}
+
+static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
+{
+        struct rrpc *rrpc = (struct rrpc *)private;
+        struct nvm_dev *dev = rrpc->dev;
+        struct rrpc_addr *addr = rrpc->trans_map + slba;
+        struct rrpc_rev_addr *raddr = rrpc->rev_trans_map;
+        sector_t max_pages = dev->total_pages * (dev->sec_size >> 9);
+        u64 elba = slba + nlb;
+        u64 i;
+
+        if (unlikely(elba > dev->total_pages)) {
+                pr_err("nvm: L2P data from device is out of bounds!\n");
+                return -EINVAL;
+        }
+
+        for (i = 0; i < nlb; i++) {
+                u64 pba = le64_to_cpu(entries[i]);
+                /* LNVM treats address-spaces as silos, LBA and PBA are
+                 * equally large and zero-indexed.
+                 */
+                if (unlikely(pba >= max_pages && pba != U64_MAX)) {
+                        pr_err("nvm: L2P data entry is out of bounds!\n");
+                        return -EINVAL;
+                }
+
+                /* Address zero is a special one. The first page on a disk is
+                 * protected. As it often holds internal device boot
+                 * information.
+                 */
+                if (!pba)
+                        continue;
+
+                addr[i].addr = pba;
+                raddr[pba].addr = slba + i;
+        }
+
+        return 0;
+}
+
+static int rrpc_map_init(struct rrpc *rrpc)
+{
+        struct nvm_dev *dev = rrpc->dev;
+        sector_t i;
+        int ret;
+
+        rrpc->trans_map = vzalloc(sizeof(struct rrpc_addr) * rrpc->nr_pages);
+        if (!rrpc->trans_map)
+                return -ENOMEM;
+
+        rrpc->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr)
+                                                        * rrpc->nr_pages);
+        if (!rrpc->rev_trans_map)
+                return -ENOMEM;
+
+        for (i = 0; i < rrpc->nr_pages; i++) {
+                struct rrpc_addr *p = &rrpc->trans_map[i];
+                struct rrpc_rev_addr *r = &rrpc->rev_trans_map[i];
+
+                p->addr = ADDR_EMPTY;
+                r->addr = ADDR_EMPTY;
+        }
+
+        if (!dev->ops->get_l2p_tbl)
+                return 0;
+
+        /* Bring up the mapping table from device */
+        ret = dev->ops->get_l2p_tbl(dev->q, 0, dev->total_pages,
+                                                        rrpc_l2p_update, rrpc);
+        if (ret) {
+                pr_err("nvm: rrpc: could not read L2P table.\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+
+/* Minimum pages needed within a lun */
+#define PAGE_POOL_SIZE 16
+#define ADDR_POOL_SIZE 64
+
+static int rrpc_core_init(struct rrpc *rrpc)
+{
+        down_write(&rrpc_lock);
+        if (!rrpc_gcb_cache) {
+                rrpc_gcb_cache = kmem_cache_create("rrpc_gcb",
+                                sizeof(struct rrpc_block_gc), 0, 0, NULL);
+                if (!rrpc_gcb_cache) {
+                        up_write(&rrpc_lock);
+                        return -ENOMEM;
+                }
+
+                rrpc_rq_cache = kmem_cache_create("rrpc_rq",
+                                sizeof(struct nvm_rq) + sizeof(struct rrpc_rq),
+                                0, 0, NULL);
+                if (!rrpc_rq_cache) {
+                        kmem_cache_destroy(rrpc_gcb_cache);
+                        up_write(&rrpc_lock);
+                        return -ENOMEM;
+                }
+        }
+        up_write(&rrpc_lock);
+
+        rrpc->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0);
+        if (!rrpc->page_pool)
+                return -ENOMEM;
+
+        rrpc->gcb_pool = mempool_create_slab_pool(rrpc->dev->nr_luns,
+                                                                rrpc_gcb_cache);
+        if (!rrpc->gcb_pool)
+                return -ENOMEM;
+
+        rrpc->rq_pool = mempool_create_slab_pool(64, rrpc_rq_cache);
+        if (!rrpc->rq_pool)
+                return -ENOMEM;
+
+        spin_lock_init(&rrpc->inflights.lock);
+        INIT_LIST_HEAD(&rrpc->inflights.reqs);
+
+        return 0;
+}
+
+static void rrpc_core_free(struct rrpc *rrpc)
+{
+        mempool_destroy(rrpc->page_pool);
+        mempool_destroy(rrpc->gcb_pool);
+        mempool_destroy(rrpc->rq_pool);
+}
+
+static void rrpc_luns_free(struct rrpc *rrpc)
+{
+        kfree(rrpc->luns);
+}
+
+static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
+{
+        struct nvm_dev *dev = rrpc->dev;
+        struct rrpc_lun *rlun;
+        int i, j;
+
+        spin_lock_init(&rrpc->rev_lock);
+
+        rrpc->luns = kcalloc(rrpc->nr_luns, sizeof(struct rrpc_lun),
+                                                                GFP_KERNEL);
+        if (!rrpc->luns)
+                return -ENOMEM;
+
+        /* 1:1 mapping */
+        for (i = 0; i < rrpc->nr_luns; i++) {
+                struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i);
+
+                if (dev->pgs_per_blk >
+                                MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
+                        pr_err("rrpc: number of pages per block too high.");
+                        goto err;
+                }
+
+                rlun = &rrpc->luns[i];
+                rlun->rrpc = rrpc;
+                rlun->parent = lun;
+                INIT_LIST_HEAD(&rlun->prio_list);
+                INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
+                spin_lock_init(&rlun->lock);
+
+                rrpc->total_blocks += dev->blks_per_lun;
+                rrpc->nr_pages += dev->sec_per_lun;
+
+                rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
+                                                rrpc->dev->blks_per_lun);
+                if (!rlun->blocks)
+                        goto err;
+
+                for (j = 0; j < rrpc->dev->blks_per_lun; j++) {
+                        struct rrpc_block *rblk = &rlun->blocks[j];
+                        struct nvm_block *blk = &lun->blocks[j];
+
+                        rblk->parent = blk;
+                        INIT_LIST_HEAD(&rblk->prio);
+                        spin_lock_init(&rblk->lock);
+                }
+        }
+
+        return 0;
+err:
+        return -ENOMEM;
+}
+
+static void rrpc_free(struct rrpc *rrpc)
+{
+        rrpc_gc_free(rrpc);
+        rrpc_map_free(rrpc);
+        rrpc_core_free(rrpc);
+        rrpc_luns_free(rrpc);
+
+        kfree(rrpc);
+}
+
+static void rrpc_exit(void *private)
+{
+        struct rrpc *rrpc = private;
+
+        del_timer(&rrpc->gc_timer);
+
+        flush_workqueue(rrpc->krqd_wq);
+        flush_workqueue(rrpc->kgc_wq);
+
+        rrpc_free(rrpc);
+}
+
+static sector_t rrpc_capacity(void *private)
+{
+        struct rrpc *rrpc = private;
+        struct nvm_dev *dev = rrpc->dev;
+        sector_t reserved, provisioned;
+
+        /* cur, gc, and two emergency blocks for each lun */
+        reserved = rrpc->nr_luns * dev->max_pages_per_blk * 4;
+        provisioned = rrpc->nr_pages - reserved;
+
+        if (reserved > rrpc->nr_pages) {
+                pr_err("rrpc: not enough space available to expose storage.\n");
+                return 0;
+        }
+
+        sector_div(provisioned, 10);
+        return provisioned * 9 * NR_PHY_IN_LOG;
+}
+
+/*
+ * Looks up the logical address from reverse trans map and check if its valid by
+ * comparing the logical to physical address with the physical address.
+ * Returns 0 on free, otherwise 1 if in use
+ */
+static void rrpc_block_map_update(struct rrpc *rrpc, struct rrpc_block *rblk)
+{
+        struct nvm_dev *dev = rrpc->dev;
+        int offset;
+        struct rrpc_addr *laddr;
+        u64 paddr, pladdr;
+
+        for (offset = 0; offset < dev->pgs_per_blk; offset++) {
+                paddr = block_to_addr(rrpc, rblk) + offset;
+
+                pladdr = rrpc->rev_trans_map[paddr].addr;
+                if (pladdr == ADDR_EMPTY)
+                        continue;
+
+                laddr = &rrpc->trans_map[pladdr];
+
+                if (paddr == laddr->addr) {
+                        laddr->rblk = rblk;
+                } else {
+                        set_bit(offset, rblk->invalid_pages);
+                        rblk->nr_invalid_pages++;
+                }
+        }
+}
+
+static int rrpc_blocks_init(struct rrpc *rrpc)
+{
+        struct rrpc_lun *rlun;
+        struct rrpc_block *rblk;
+        int lun_iter, blk_iter;
+
+        for (lun_iter = 0; lun_iter < rrpc->nr_luns; lun_iter++) {
+                rlun = &rrpc->luns[lun_iter];
+
+                for (blk_iter = 0; blk_iter < rrpc->dev->blks_per_lun;
+                                                                blk_iter++) {
+                        rblk = &rlun->blocks[blk_iter];
+                        rrpc_block_map_update(rrpc, rblk);
+                }
+        }
+
+        return 0;
+}
+
+static int rrpc_luns_configure(struct rrpc *rrpc)
+{
+        struct rrpc_lun *rlun;
+        struct rrpc_block *rblk;
+        int i;
+
+        for (i = 0; i < rrpc->nr_luns; i++) {
+                rlun = &rrpc->luns[i];
+
+                rblk = rrpc_get_blk(rrpc, rlun, 0);
+                if (!rblk)
+                        return -EINVAL;
+
+                rrpc_set_lun_cur(rlun, rblk);
+
+                /* Emergency gc block */
+                rblk = rrpc_get_blk(rrpc, rlun, 1);
+                if (!rblk)
+                        return -EINVAL;
+                rlun->gc_cur = rblk;
+        }
+
+        return 0;
+}
+
+static struct nvm_tgt_type tt_rrpc;
+
+static void *rrpc_init(struct nvm_dev *dev, struct gendisk *tdisk,
+                                                int lun_begin, int lun_end)
+{
+        struct request_queue *bqueue = dev->q;
+        struct request_queue *tqueue = tdisk->queue;
+        struct rrpc *rrpc;
+        int ret;
+
+        if (!(dev->identity.dom & NVM_RSP_L2P)) {
+                pr_err("nvm: rrpc: device does not support l2p (%x)\n",
+                                                        dev->identity.dom);
+                return ERR_PTR(-EINVAL);
+        }
+
+        rrpc = kzalloc(sizeof(struct rrpc), GFP_KERNEL);
+        if (!rrpc)
+                return ERR_PTR(-ENOMEM);
+
+        rrpc->instance.tt = &tt_rrpc;
+        rrpc->dev = dev;
+        rrpc->disk = tdisk;
+
+        bio_list_init(&rrpc->requeue_bios);
+        spin_lock_init(&rrpc->bio_lock);
+        INIT_WORK(&rrpc->ws_requeue, rrpc_requeue);
+
+        rrpc->nr_luns = lun_end - lun_begin + 1;
+
+        /* simple round-robin strategy */
+        atomic_set(&rrpc->next_lun, -1);
+
+        ret = rrpc_luns_init(rrpc, lun_begin, lun_end);
+        if (ret) {
+                pr_err("nvm: rrpc: could not initialize luns\n");
+                goto err;
+        }
+
+        rrpc->poffset = dev->sec_per_lun * lun_begin;
+        rrpc->lun_offset = lun_begin;
+
+        ret = rrpc_core_init(rrpc);
+        if (ret) {
+                pr_err("nvm: rrpc: could not initialize core\n");
+                goto err;
+        }
+
+        ret = rrpc_map_init(rrpc);
+        if (ret) {
+                pr_err("nvm: rrpc: could not initialize maps\n");
+                goto err;
+        }
+
+        ret = rrpc_blocks_init(rrpc);
+        if (ret) {
+                pr_err("nvm: rrpc: could not initialize state for blocks\n");
+                goto err;
+        }
+
+        ret = rrpc_luns_configure(rrpc);
+        if (ret) {
+                pr_err("nvm: rrpc: not enough blocks available in LUNs.\n");
+                goto err;
+        }
+
+        ret = rrpc_gc_init(rrpc);
+        if (ret) {
+                pr_err("nvm: rrpc: could not initialize gc\n");
+                goto err;
+        }
+
+        /* inherit the size from the underlying device */
+        blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
+        blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
+
+        pr_info("nvm: rrpc initialized with %u luns and %llu pages.\n",
+                        rrpc->nr_luns, (unsigned long long)rrpc->nr_pages);
+
+        mod_timer(&rrpc->gc_timer, jiffies + msecs_to_jiffies(10));
+
+        return rrpc;
+err:
+        rrpc_free(rrpc);
+        return ERR_PTR(ret);
+}
+
+/* round robin, page-based FTL, and cost-based GC */
+static struct nvm_tgt_type tt_rrpc = {
+        .name           = "rrpc",
+        .version        = {1, 0, 0},
+
+        .make_rq        = rrpc_make_rq,
+        .capacity       = rrpc_capacity,
+        .end_io         = rrpc_end_io,
+
+        .init           = rrpc_init,
+        .exit           = rrpc_exit,
+};
+
+static int __init rrpc_module_init(void)
+{
+        return nvm_register_target(&tt_rrpc);
+}
+
+static void rrpc_module_exit(void)
+{
+        nvm_unregister_target(&tt_rrpc);
+}
+
+module_init(rrpc_module_init);
+module_exit(rrpc_module_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Block-Device Target for Open-Channel SSDs");
diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h
new file mode 100644
index 000000000000..a9696a06c38c
--- /dev/null
+++ b/drivers/lightnvm/rrpc.h
@@ -0,0 +1,239 @@
+/*
+ * Copyright (C) 2015 IT University of Copenhagen
+ * 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.
+ *
+ * Implementation of a Round-robin page-based Hybrid FTL for Open-channel SSDs.
+ */
+
+#ifndef RRPC_H_
+#define RRPC_H_
+
+#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
+#include <linux/bio.h>
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <linux/vmalloc.h>
+
+#include <linux/lightnvm.h>
+
+/* Run only GC if less than 1/X blocks are free */
+#define GC_LIMIT_INVERSE 10
+#define GC_TIME_SECS 100
+
+#define RRPC_SECTOR (512)
+#define RRPC_EXPOSED_PAGE_SIZE (4096)
+
+#define NR_PHY_IN_LOG (RRPC_EXPOSED_PAGE_SIZE / RRPC_SECTOR)
+
+struct rrpc_inflight {
+        struct list_head reqs;
+        spinlock_t lock;
+};
+
+struct rrpc_inflight_rq {
+        struct list_head list;
+        sector_t l_start;
+        sector_t l_end;
+};
+
+struct rrpc_rq {
+        struct rrpc_inflight_rq inflight_rq;
+        struct rrpc_addr *addr;
+        unsigned long flags;
+};
+
+struct rrpc_block {
+        struct nvm_block *parent;
+        struct list_head prio;
+
+#define MAX_INVALID_PAGES_STORAGE 8
+        /* Bitmap for invalid page intries */
+        unsigned long invalid_pages[MAX_INVALID_PAGES_STORAGE];
+        /* points to the next writable page within a block */
+        unsigned int next_page;
+        /* number of pages that are invalid, wrt host page size */
+        unsigned int nr_invalid_pages;
+
+        spinlock_t lock;
+        atomic_t data_cmnt_size; /* data pages committed to stable storage */
+};
+
+struct rrpc_lun {
+        struct rrpc *rrpc;
+        struct nvm_lun *parent;
+        struct rrpc_block *cur, *gc_cur;
+        struct rrpc_block *blocks;      /* Reference to block allocation */
+        struct list_head prio_list;             /* Blocks that may be GC'ed */
+        struct work_struct ws_gc;
+
+        spinlock_t lock;
+};
+
+struct rrpc {
+        /* instance must be kept in top to resolve rrpc in unprep */
+        struct nvm_tgt_instance instance;
+
+        struct nvm_dev *dev;
+        struct gendisk *disk;
+
+        u64 poffset; /* physical page offset */
+        int lun_offset;
+
+        int nr_luns;
+        struct rrpc_lun *luns;
+
+        /* calculated values */
+        unsigned long long nr_pages;
+        unsigned long total_blocks;
+
+        /* Write strategy variables. Move these into each for structure for each
+         * strategy
+         */
+        atomic_t next_lun; /* Whenever a page is written, this is updated
+                            * to point to the next write lun
+                            */
+
+        spinlock_t bio_lock;
+        struct bio_list requeue_bios;
+        struct work_struct ws_requeue;
+
+        /* Simple translation map of logical addresses to physical addresses.
+         * The logical addresses is known by the host system, while the physical
+         * addresses are used when writing to the disk block device.
+         */
+        struct rrpc_addr *trans_map;
+        /* also store a reverse map for garbage collection */
+        struct rrpc_rev_addr *rev_trans_map;
+        spinlock_t rev_lock;
+
+        struct rrpc_inflight inflights;
+
+        mempool_t *addr_pool;
+        mempool_t *page_pool;
+        mempool_t *gcb_pool;
+        mempool_t *rq_pool;
+
+        struct timer_list gc_timer;
+        struct workqueue_struct *krqd_wq;
+        struct workqueue_struct *kgc_wq;
+};
+
+struct rrpc_block_gc {
+        struct rrpc *rrpc;
+        struct rrpc_block *rblk;
+        struct work_struct ws_gc;
+};
+
+/* Logical to physical mapping */
+struct rrpc_addr {
+        u64 addr;
+        struct rrpc_block *rblk;
+};
+
+/* Physical to logical mapping */
+struct rrpc_rev_addr {
+        u64 addr;
+};
+
+static inline sector_t rrpc_get_laddr(struct bio *bio)
+{
+        return bio->bi_iter.bi_sector / NR_PHY_IN_LOG;
+}
+
+static inline unsigned int rrpc_get_pages(struct bio *bio)
+{
+        return  bio->bi_iter.bi_size / RRPC_EXPOSED_PAGE_SIZE;
+}
+
+static inline sector_t rrpc_get_sector(sector_t laddr)
+{
+        return laddr * NR_PHY_IN_LOG;
+}
+
+static inline int request_intersects(struct rrpc_inflight_rq *r,
+                                sector_t laddr_start, sector_t laddr_end)
+{
+        return (laddr_end >= r->l_start && laddr_end <= r->l_end) &&
+                (laddr_start >= r->l_start && laddr_start <= r->l_end);
+}
+
+static int __rrpc_lock_laddr(struct rrpc *rrpc, sector_t laddr,
+                             unsigned pages, struct rrpc_inflight_rq *r)
+{
+        sector_t laddr_end = laddr + pages - 1;
+        struct rrpc_inflight_rq *rtmp;
+
+        spin_lock_irq(&rrpc->inflights.lock);
+        list_for_each_entry(rtmp, &rrpc->inflights.reqs, list) {
+                if (unlikely(request_intersects(rtmp, laddr, laddr_end))) {
+                        /* existing, overlapping request, come back later */
+                        spin_unlock_irq(&rrpc->inflights.lock);
+                        return 1;
+                }
+        }
+
+        r->l_start = laddr;
+        r->l_end = laddr_end;
+
+        list_add_tail(&r->list, &rrpc->inflights.reqs);
+        spin_unlock_irq(&rrpc->inflights.lock);
+        return 0;
+}
+
+static inline int rrpc_lock_laddr(struct rrpc *rrpc, sector_t laddr,
+                                 unsigned pages,
+                                 struct rrpc_inflight_rq *r)
+{
+        BUG_ON((laddr + pages) > rrpc->nr_pages);
+
+        return __rrpc_lock_laddr(rrpc, laddr, pages, r);
+}
+
+static inline struct rrpc_inflight_rq *rrpc_get_inflight_rq(struct nvm_rq *rqd)
+{
+        struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
+
+        return &rrqd->inflight_rq;
+}
+
+static inline int rrpc_lock_rq(struct rrpc *rrpc, struct bio *bio,
+                                                        struct nvm_rq *rqd)
+{
+        sector_t laddr = rrpc_get_laddr(bio);
+        unsigned int pages = rrpc_get_pages(bio);
+        struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
+
+        return rrpc_lock_laddr(rrpc, laddr, pages, r);
+}
+
+static inline void rrpc_unlock_laddr(struct rrpc *rrpc,
+                                                struct rrpc_inflight_rq *r)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&rrpc->inflights.lock, flags);
+        list_del_init(&r->list);
+        spin_unlock_irqrestore(&rrpc->inflights.lock, flags);
+}
+
+static inline void rrpc_unlock_rq(struct rrpc *rrpc, struct nvm_rq *rqd)
+{
+        struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
+        uint8_t pages = rqd->nr_pages;
+
+        BUG_ON((r->l_start + pages) > rrpc->nr_pages);
+
+        rrpc_unlock_laddr(rrpc, r);
+}
+
+#endif /* RRPC_H_ */
diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile
index cfb6679ec245..219dc206fa5f 100644
--- a/drivers/nvme/host/Makefile
+++ b/drivers/nvme/host/Makefile
@@ -1,4 +1,4 @@
 
 obj-$(CONFIG_BLK_DEV_NVME)     += nvme.o
 
-nvme-y          += pci.o scsi.o
+nvme-y          += pci.o scsi.o lightnvm.o
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
new file mode 100644
index 000000000000..e0b7b95813bc
--- /dev/null
+++ b/drivers/nvme/host/lightnvm.c
@@ -0,0 +1,526 @@
+/*
+ * nvme-lightnvm.c - LightNVM NVMe device
+ *
+ * Copyright (C) 2014-2015 IT University of Copenhagen
+ * Initial release: Matias Bjorling <mb@lightnvm.io>
+ *
+ * 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 "nvme.h"
+
+#ifdef CONFIG_NVM
+
+#include <linux/nvme.h>
+#include <linux/bitops.h>
+#include <linux/lightnvm.h>
+#include <linux/vmalloc.h>
+
+enum nvme_nvm_admin_opcode {
+        nvme_nvm_admin_identity         = 0xe2,
+        nvme_nvm_admin_get_l2p_tbl      = 0xea,
+        nvme_nvm_admin_get_bb_tbl       = 0xf2,
+        nvme_nvm_admin_set_bb_tbl       = 0xf1,
+};
+
+struct nvme_nvm_hb_rw {
+        __u8                    opcode;
+        __u8                    flags;
+        __u16                   command_id;
+        __le32                  nsid;
+        __u64                   rsvd2;
+        __le64                  metadata;
+        __le64                  prp1;
+        __le64                  prp2;
+        __le64                  spba;
+        __le16                  length;
+        __le16                  control;
+        __le32                  dsmgmt;
+        __le64                  slba;
+};
+
+struct nvme_nvm_ph_rw {
+        __u8                    opcode;
+        __u8                    flags;
+        __u16                   command_id;
+        __le32                  nsid;
+        __u64                   rsvd2;
+        __le64                  metadata;
+        __le64                  prp1;
+        __le64                  prp2;
+        __le64                  spba;
+        __le16                  length;
+        __le16                  control;
+        __le32                  dsmgmt;
+        __le64                  resv;
+};
+
+struct nvme_nvm_identity {
+        __u8                    opcode;
+        __u8                    flags;
+        __u16                   command_id;
+        __le32                  nsid;
+        __u64                   rsvd[2];
+        __le64                  prp1;
+        __le64                  prp2;
+        __le32                  chnl_off;
+        __u32                   rsvd11[5];
+};
+
+struct nvme_nvm_l2ptbl {
+        __u8                    opcode;
+        __u8                    flags;
+        __u16                   command_id;
+        __le32                  nsid;
+        __le32                  cdw2[4];
+        __le64                  prp1;
+        __le64                  prp2;
+        __le64                  slba;
+        __le32                  nlb;
+        __le16                  cdw14[6];
+};
+
+struct nvme_nvm_bbtbl {
+        __u8                    opcode;
+        __u8                    flags;
+        __u16                   command_id;
+        __le32                  nsid;
+        __u64                   rsvd[2];
+        __le64                  prp1;
+        __le64                  prp2;
+        __le32                  prp1_len;
+        __le32                  prp2_len;
+        __le32                  lbb;
+        __u32                   rsvd11[3];
+};
+
+struct nvme_nvm_erase_blk {
+        __u8                    opcode;
+        __u8                    flags;
+        __u16                   command_id;
+        __le32                  nsid;
+        __u64                   rsvd[2];
+        __le64                  prp1;
+        __le64                  prp2;
+        __le64                  spba;
+        __le16                  length;
+        __le16                  control;
+        __le32                  dsmgmt;
+        __le64                  resv;
+};
+
+struct nvme_nvm_command {
+        union {
+                struct nvme_common_command common;
+                struct nvme_nvm_identity identity;
+                struct nvme_nvm_hb_rw hb_rw;
+                struct nvme_nvm_ph_rw ph_rw;
+                struct nvme_nvm_l2ptbl l2p;
+                struct nvme_nvm_bbtbl get_bb;
+                struct nvme_nvm_bbtbl set_bb;
+                struct nvme_nvm_erase_blk erase;
+        };
+};
+
+struct nvme_nvm_id_group {
+        __u8                    mtype;
+        __u8                    fmtype;
+        __le16                  res16;
+        __u8                    num_ch;
+        __u8                    num_lun;
+        __u8                    num_pln;
+        __le16                  num_blk;
+        __le16                  num_pg;
+        __le16                  fpg_sz;
+        __le16                  csecs;
+        __le16                  sos;
+        __le32                  trdt;
+        __le32                  trdm;
+        __le32                  tprt;
+        __le32                  tprm;
+        __le32                  tbet;
+        __le32                  tbem;
+        __le32                  mpos;
+        __le16                  cpar;
+        __u8                    reserved[913];
+} __packed;
+
+struct nvme_nvm_addr_format {
+        __u8                    ch_offset;
+        __u8                    ch_len;
+        __u8                    lun_offset;
+        __u8                    lun_len;
+        __u8                    pln_offset;
+        __u8                    pln_len;
+        __u8                    blk_offset;
+        __u8                    blk_len;
+        __u8                    pg_offset;
+        __u8                    pg_len;
+        __u8                    sect_offset;
+        __u8                    sect_len;
+        __u8                    res[4];
+} __packed;
+
+struct nvme_nvm_id {
+        __u8                    ver_id;
+        __u8                    vmnt;
+        __u8                    cgrps;
+        __u8                    res[5];
+        __le32                  cap;
+        __le32                  dom;
+        struct nvme_nvm_addr_format ppaf;
+        __u8                    ppat;
+        __u8                    resv[223];
+        struct nvme_nvm_id_group groups[4];
+} __packed;
+
+/*
+ * Check we didn't inadvertently grow the command struct
+ */
+static inline void _nvme_nvm_check_size(void)
+{
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_hb_rw) != 64);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_bbtbl) != 64);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_l2ptbl) != 64);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_id_group) != 960);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_addr_format) != 128);
+        BUILD_BUG_ON(sizeof(struct nvme_nvm_id) != 4096);
+}
+
+static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id)
+{
+        struct nvme_nvm_id_group *src;
+        struct nvm_id_group *dst;
+        int i, end;
+
+        end = min_t(u32, 4, nvm_id->cgrps);
+
+        for (i = 0; i < end; i++) {
+                src = &nvme_nvm_id->groups[i];
+                dst = &nvm_id->groups[i];
+
+                dst->mtype = src->mtype;
+                dst->fmtype = src->fmtype;
+                dst->num_ch = src->num_ch;
+                dst->num_lun = src->num_lun;
+                dst->num_pln = src->num_pln;
+
+                dst->num_pg = le16_to_cpu(src->num_pg);
+                dst->num_blk = le16_to_cpu(src->num_blk);
+                dst->fpg_sz = le16_to_cpu(src->fpg_sz);
+                dst->csecs = le16_to_cpu(src->csecs);
+                dst->sos = le16_to_cpu(src->sos);
+
+                dst->trdt = le32_to_cpu(src->trdt);
+                dst->trdm = le32_to_cpu(src->trdm);
+                dst->tprt = le32_to_cpu(src->tprt);
+                dst->tprm = le32_to_cpu(src->tprm);
+                dst->tbet = le32_to_cpu(src->tbet);
+                dst->tbem = le32_to_cpu(src->tbem);
+                dst->mpos = le32_to_cpu(src->mpos);
+
+                dst->cpar = le16_to_cpu(src->cpar);
+        }
+
+        return 0;
+}
+
+static int nvme_nvm_identity(struct request_queue *q, struct nvm_id *nvm_id)
+{
+        struct nvme_ns *ns = q->queuedata;
+        struct nvme_nvm_id *nvme_nvm_id;
+        struct nvme_nvm_command c = {};
+        int ret;
+
+        c.identity.opcode = nvme_nvm_admin_identity;
+        c.identity.nsid = cpu_to_le32(ns->ns_id);
+        c.identity.chnl_off = 0;
+
+        nvme_nvm_id = kmalloc(sizeof(struct nvme_nvm_id), GFP_KERNEL);
+        if (!nvme_nvm_id)
+                return -ENOMEM;
+
+        ret = nvme_submit_sync_cmd(q, (struct nvme_command *)&c, nvme_nvm_id,
+                                                sizeof(struct nvme_nvm_id));
+        if (ret) {
+                ret = -EIO;
+                goto out;
+        }
+
+        nvm_id->ver_id = nvme_nvm_id->ver_id;
+        nvm_id->vmnt = nvme_nvm_id->vmnt;
+        nvm_id->cgrps = nvme_nvm_id->cgrps;
+        nvm_id->cap = le32_to_cpu(nvme_nvm_id->cap);
+        nvm_id->dom = le32_to_cpu(nvme_nvm_id->dom);
+
+        ret = init_grps(nvm_id, nvme_nvm_id);
+out:
+        kfree(nvme_nvm_id);
+        return ret;
+}
+
+static int nvme_nvm_get_l2p_tbl(struct request_queue *q, u64 slba, u32 nlb,
+                                nvm_l2p_update_fn *update_l2p, void *priv)
+{
+        struct nvme_ns *ns = q->queuedata;
+        struct nvme_dev *dev = ns->dev;
+        struct nvme_nvm_command c = {};
+        u32 len = queue_max_hw_sectors(q) << 9;
+        u32 nlb_pr_rq = len / sizeof(u64);
+        u64 cmd_slba = slba;
+        void *entries;
+        int ret = 0;
+
+        c.l2p.opcode = nvme_nvm_admin_get_l2p_tbl;
+        c.l2p.nsid = cpu_to_le32(ns->ns_id);
+        entries = kmalloc(len, GFP_KERNEL);
+        if (!entries)
+                return -ENOMEM;
+
+        while (nlb) {
+                u32 cmd_nlb = min(nlb_pr_rq, nlb);
+
+                c.l2p.slba = cpu_to_le64(cmd_slba);
+                c.l2p.nlb = cpu_to_le32(cmd_nlb);
+
+                ret = nvme_submit_sync_cmd(q, (struct nvme_command *)&c,
+                                                                entries, len);
+                if (ret) {
+                        dev_err(dev->dev, "L2P table transfer failed (%d)\n",
+                                                                        ret);
+                        ret = -EIO;
+                        goto out;
+                }
+
+                if (update_l2p(cmd_slba, cmd_nlb, entries, priv)) {
+                        ret = -EINTR;
+                        goto out;
+                }
+
+                cmd_slba += cmd_nlb;
+                nlb -= cmd_nlb;
+        }
+
+out:
+        kfree(entries);
+        return ret;
+}
+
+static int nvme_nvm_get_bb_tbl(struct request_queue *q, int lunid,
+                                unsigned int nr_blocks,
+                                nvm_bb_update_fn *update_bbtbl, void *priv)
+{
+        struct nvme_ns *ns = q->queuedata;
+        struct nvme_dev *dev = ns->dev;
+        struct nvme_nvm_command c = {};
+        void *bb_bitmap;
+        u16 bb_bitmap_size;
+        int ret = 0;
+
+        c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl;
+        c.get_bb.nsid = cpu_to_le32(ns->ns_id);
+        c.get_bb.lbb = cpu_to_le32(lunid);
+        bb_bitmap_size = ((nr_blocks >> 15) + 1) * PAGE_SIZE;
+        bb_bitmap = kmalloc(bb_bitmap_size, GFP_KERNEL);
+        if (!bb_bitmap)
+                return -ENOMEM;
+
+        bitmap_zero(bb_bitmap, nr_blocks);
+
+        ret = nvme_submit_sync_cmd(q, (struct nvme_command *)&c, bb_bitmap,
+                                                                bb_bitmap_size);
+        if (ret) {
+                dev_err(dev->dev, "get bad block table failed (%d)\n", ret);
+                ret = -EIO;
+                goto out;
+        }
+
+        ret = update_bbtbl(lunid, bb_bitmap, nr_blocks, priv);
+        if (ret) {
+                ret = -EINTR;
+                goto out;
+        }
+
+out:
+        kfree(bb_bitmap);
+        return ret;
+}
+
+static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
+                                struct nvme_ns *ns, struct nvme_nvm_command *c)
+{
+        c->ph_rw.opcode = rqd->opcode;
+        c->ph_rw.nsid = cpu_to_le32(ns->ns_id);
+        c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa);
+        c->ph_rw.control = cpu_to_le16(rqd->flags);
+        c->ph_rw.length = cpu_to_le16(rqd->nr_pages - 1);
+
+        if (rqd->opcode == NVM_OP_HBWRITE || rqd->opcode == NVM_OP_HBREAD)
+                c->hb_rw.slba = cpu_to_le64(nvme_block_nr(ns,
+                                                rqd->bio->bi_iter.bi_sector));
+}
+
+static void nvme_nvm_end_io(struct request *rq, int error)
+{
+        struct nvm_rq *rqd = rq->end_io_data;
+        struct nvm_dev *dev = rqd->dev;
+
+        if (dev->mt->end_io(rqd, error))
+                pr_err("nvme: err status: %x result: %lx\n",
+                                rq->errors, (unsigned long)rq->special);
+
+        kfree(rq->cmd);
+        blk_mq_free_request(rq);
+}
+
+static int nvme_nvm_submit_io(struct request_queue *q, struct nvm_rq *rqd)
+{
+        struct nvme_ns *ns = q->queuedata;
+        struct request *rq;
+        struct bio *bio = rqd->bio;
+        struct nvme_nvm_command *cmd;
+
+        rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0);
+        if (IS_ERR(rq))
+                return -ENOMEM;
+
+        cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
+        if (!cmd) {
+                blk_mq_free_request(rq);
+                return -ENOMEM;
+        }
+
+        rq->cmd_type = REQ_TYPE_DRV_PRIV;
+        rq->ioprio = bio_prio(bio);
+
+        if (bio_has_data(bio))
+                rq->nr_phys_segments = bio_phys_segments(q, bio);
+
+        rq->__data_len = bio->bi_iter.bi_size;
+        rq->bio = rq->biotail = bio;
+
+        nvme_nvm_rqtocmd(rq, rqd, ns, cmd);
+
+        rq->cmd = (unsigned char *)cmd;
+        rq->cmd_len = sizeof(struct nvme_nvm_command);
+        rq->special = (void *)0;
+
+        rq->end_io_data = rqd;
+
+        blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io);
+
+        return 0;
+}
+
+static int nvme_nvm_erase_block(struct request_queue *q, struct nvm_rq *rqd)
+{
+        struct nvme_ns *ns = q->queuedata;
+        struct nvme_nvm_command c = {};
+
+        c.erase.opcode = NVM_OP_ERASE;
+        c.erase.nsid = cpu_to_le32(ns->ns_id);
+        c.erase.spba = cpu_to_le64(rqd->ppa_addr.ppa);
+        c.erase.length = cpu_to_le16(rqd->nr_pages - 1);
+
+        return nvme_submit_sync_cmd(q, (struct nvme_command *)&c, NULL, 0);
+}
+
+static void *nvme_nvm_create_dma_pool(struct request_queue *q, char *name)
+{
+        struct nvme_ns *ns = q->queuedata;
+        struct nvme_dev *dev = ns->dev;
+
+        return dma_pool_create(name, dev->dev, PAGE_SIZE, PAGE_SIZE, 0);
+}
+
+static void nvme_nvm_destroy_dma_pool(void *pool)
+{
+        struct dma_pool *dma_pool = pool;
+
+        dma_pool_destroy(dma_pool);
+}
+
+static void *nvme_nvm_dev_dma_alloc(struct request_queue *q, void *pool,
+                                    gfp_t mem_flags, dma_addr_t *dma_handler)
+{
+        return dma_pool_alloc(pool, mem_flags, dma_handler);
+}
+
+static void nvme_nvm_dev_dma_free(void *pool, void *ppa_list,
+                                                        dma_addr_t dma_handler)
+{
+        dma_pool_free(pool, ppa_list, dma_handler);
+}
+
+static struct nvm_dev_ops nvme_nvm_dev_ops = {
+        .identity               = nvme_nvm_identity,
+
+        .get_l2p_tbl            = nvme_nvm_get_l2p_tbl,
+
+        .get_bb_tbl             = nvme_nvm_get_bb_tbl,
+
+        .submit_io              = nvme_nvm_submit_io,
+        .erase_block            = nvme_nvm_erase_block,
+
+        .create_dma_pool        = nvme_nvm_create_dma_pool,
+        .destroy_dma_pool       = nvme_nvm_destroy_dma_pool,
+        .dev_dma_alloc          = nvme_nvm_dev_dma_alloc,
+        .dev_dma_free           = nvme_nvm_dev_dma_free,
+
+        .max_phys_sect          = 64,
+};
+
+int nvme_nvm_register(struct request_queue *q, char *disk_name)
+{
+        return nvm_register(q, disk_name, &nvme_nvm_dev_ops);
+}
+
+void nvme_nvm_unregister(struct request_queue *q, char *disk_name)
+{
+        nvm_unregister(disk_name);
+}
+
+int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
+{
+        struct nvme_dev *dev = ns->dev;
+        struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+        /* QEMU NVMe simulator - PCI ID + Vendor specific bit */
+        if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x5845 &&
+                                                        id->vs[0] == 0x1)
+                return 1;
+
+        /* CNEX Labs - PCI ID + Vendor specific bit */
+        if (pdev->vendor == 0x1d1d && pdev->device == 0x2807 &&
+                                                        id->vs[0] == 0x1)
+                return 1;
+
+        return 0;
+}
+#else
+int nvme_nvm_register(struct request_queue *q, char *disk_name)
+{
+        return 0;
+}
+void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};
+int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
+{
+        return 0;
+}
+#endif /* CONFIG_NVM */
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index c1f41bf3c0f2..fdb4e5bad9ac 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -22,6 +22,11 @@
 extern unsigned char nvme_io_timeout;
 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
 
+enum {
+        NVME_NS_LBA             = 0,
+        NVME_NS_LIGHTNVM        = 1,
+};
+
 /*
  * Represents an NVM Express device.  Each nvme_dev is a PCI function.
  */
@@ -84,6 +89,7 @@ struct nvme_ns {
         u16 ms;
         bool ext;
         u8 pi_type;
+        int type;
         u64 mode_select_num_blocks;
         u32 mode_select_block_len;
 };
@@ -130,4 +136,8 @@ int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
 int nvme_sg_get_version_num(int __user *ip);
 
+int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
+int nvme_nvm_register(struct request_queue *q, char *disk_name);
+void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
+
 #endif /* _NVME_H */
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 0a179ed9ddef..6c0d0fecaeb3 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1952,6 +1952,9 @@ static void nvme_free_ns(struct kref *kref)
 {
         struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
 
+        if (ns->type == NVME_NS_LIGHTNVM)
+                nvme_nvm_unregister(ns->queue, ns->disk->disk_name);
+
         spin_lock(&dev_list_lock);
         ns->disk->private_data = NULL;
         spin_unlock(&dev_list_lock);
@@ -2021,6 +2024,16 @@ static int nvme_revalidate_disk(struct gendisk *disk)
                 return -ENODEV;
         }
 
+        if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
+                if (nvme_nvm_register(ns->queue, disk->disk_name)) {
+                        dev_warn(dev->dev,
+                                "%s: LightNVM init failure\n", __func__);
+                        kfree(id);
+                        return -ENODEV;
+                }
+                ns->type = NVME_NS_LIGHTNVM;
+        }
+
         old_ms = ns->ms;
         lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
         ns->lba_shift = id->lbaf[lbaf].ds;
@@ -2052,7 +2065,9 @@ static int nvme_revalidate_disk(struct gendisk *disk)
                                                                 !ns->ext)
                 nvme_init_integrity(ns);
 
-        if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
+        if ((ns->ms && !(ns->ms == 8 && ns->pi_type) &&
+                                                !blk_get_integrity(disk)) ||
+                                                ns->type == NVME_NS_LIGHTNVM)
                 set_capacity(disk, 0);
         else
                 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
@@ -2175,17 +2190,19 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
                 goto out_free_disk;
 
         kref_get(&dev->kref);
-        add_disk(ns->disk);
-        if (ns->ms) {
-                struct block_device *bd = bdget_disk(ns->disk, 0);
-                if (!bd)
-                        return;
-                if (blkdev_get(bd, FMODE_READ, NULL)) {
-                        bdput(bd);
-                        return;
+        if (ns->type != NVME_NS_LIGHTNVM) {
+                add_disk(ns->disk);
+                if (ns->ms) {
+                        struct block_device *bd = bdget_disk(ns->disk, 0);
+                        if (!bd)
+                                return;
+                        if (blkdev_get(bd, FMODE_READ, NULL)) {
+                                bdput(bd);
+                                return;
+                        }
+                        blkdev_reread_part(bd);
+                        blkdev_put(bd, FMODE_READ);
                 }
-                blkdev_reread_part(bd);
-                blkdev_put(bd, FMODE_READ);
         }
         return;
  out_free_disk:
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
new file mode 100644
index 000000000000..5ebd70d12f35
--- /dev/null
+++ b/include/linux/lightnvm.h
@@ -0,0 +1,522 @@
+#ifndef NVM_H
+#define NVM_H
+
+enum {
+        NVM_IO_OK = 0,
+        NVM_IO_REQUEUE = 1,
+        NVM_IO_DONE = 2,
+        NVM_IO_ERR = 3,
+
+        NVM_IOTYPE_NONE = 0,
+        NVM_IOTYPE_GC = 1,
+};
+
+#ifdef CONFIG_NVM
+
+#include <linux/blkdev.h>
+#include <linux/types.h>
+#include <linux/file.h>
+#include <linux/dmapool.h>
+
+enum {
+        /* HW Responsibilities */
+        NVM_RSP_L2P     = 1 << 0,
+        NVM_RSP_ECC     = 1 << 1,
+
+        /* Physical Adressing Mode */
+        NVM_ADDRMODE_LINEAR     = 0,
+        NVM_ADDRMODE_CHANNEL    = 1,
+
+        /* Plane programming mode for LUN */
+        NVM_PLANE_SINGLE        = 0,
+        NVM_PLANE_DOUBLE        = 1,
+        NVM_PLANE_QUAD          = 2,
+
+        /* Status codes */
+        NVM_RSP_SUCCESS         = 0x0,
+        NVM_RSP_NOT_CHANGEABLE  = 0x1,
+        NVM_RSP_ERR_FAILWRITE   = 0x40ff,
+        NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
+
+        /* Device opcodes */
+        NVM_OP_HBREAD           = 0x02,
+        NVM_OP_HBWRITE          = 0x81,
+        NVM_OP_PWRITE           = 0x91,
+        NVM_OP_PREAD            = 0x92,
+        NVM_OP_ERASE            = 0x90,
+
+        /* PPA Command Flags */
+        NVM_IO_SNGL_ACCESS      = 0x0,
+        NVM_IO_DUAL_ACCESS      = 0x1,
+        NVM_IO_QUAD_ACCESS      = 0x2,
+
+        NVM_IO_SUSPEND          = 0x80,
+        NVM_IO_SLC_MODE         = 0x100,
+        NVM_IO_SCRAMBLE_DISABLE = 0x200,
+};
+
+struct nvm_id_group {
+        u8      mtype;
+        u8      fmtype;
+        u16     res16;
+        u8      num_ch;
+        u8      num_lun;
+        u8      num_pln;
+        u16     num_blk;
+        u16     num_pg;
+        u16     fpg_sz;
+        u16     csecs;
+        u16     sos;
+        u32     trdt;
+        u32     trdm;
+        u32     tprt;
+        u32     tprm;
+        u32     tbet;
+        u32     tbem;
+        u32     mpos;
+        u16     cpar;
+        u8      res[913];
+} __packed;
+
+struct nvm_addr_format {
+        u8      ch_offset;
+        u8      ch_len;
+        u8      lun_offset;
+        u8      lun_len;
+        u8      pln_offset;
+        u8      pln_len;
+        u8      blk_offset;
+        u8      blk_len;
+        u8      pg_offset;
+        u8      pg_len;
+        u8      sect_offset;
+        u8      sect_len;
+        u8      res[4];
+};
+
+struct nvm_id {
+        u8      ver_id;
+        u8      vmnt;
+        u8      cgrps;
+        u8      res[5];
+        u32     cap;
+        u32     dom;
+        struct nvm_addr_format ppaf;
+        u8      ppat;
+        u8      resv[224];
+        struct nvm_id_group groups[4];
+} __packed;
+
+struct nvm_target {
+        struct list_head list;
+        struct nvm_tgt_type *type;
+        struct gendisk *disk;
+};
+
+struct nvm_tgt_instance {
+        struct nvm_tgt_type *tt;
+};
+
+#define ADDR_EMPTY (~0ULL)
+
+#define NVM_VERSION_MAJOR 1
+#define NVM_VERSION_MINOR 0
+#define NVM_VERSION_PATCH 0
+
+#define NVM_SEC_BITS (8)
+#define NVM_PL_BITS  (6)
+#define NVM_PG_BITS  (16)
+#define NVM_BLK_BITS (16)
+#define NVM_LUN_BITS (10)
+#define NVM_CH_BITS  (8)
+
+struct ppa_addr {
+        union {
+                /* Channel-based PPA format in nand 4x2x2x2x8x10 */
+                struct {
+                        u64 ch          : 4;
+                        u64 sec         : 2; /* 4 sectors per page */
+                        u64 pl          : 2; /* 4 planes per LUN */
+                        u64 lun         : 2; /* 4 LUNs per channel */
+                        u64 pg          : 8; /* 256 pages per block */
+                        u64 blk         : 10;/* 1024 blocks per plane */
+                        u64 resved              : 36;
+                } chnl;
+
+                /* Generic structure for all addresses */
+                struct {
+                        u64 sec         : NVM_SEC_BITS;
+                        u64 pl          : NVM_PL_BITS;
+                        u64 pg          : NVM_PG_BITS;
+                        u64 blk         : NVM_BLK_BITS;
+                        u64 lun         : NVM_LUN_BITS;
+                        u64 ch          : NVM_CH_BITS;
+                } g;
+
+                u64 ppa;
+        };
+} __packed;
+
+struct nvm_rq {
+        struct nvm_tgt_instance *ins;
+        struct nvm_dev *dev;
+
+        struct bio *bio;
+
+        union {
+                struct ppa_addr ppa_addr;
+                dma_addr_t dma_ppa_list;
+        };
+
+        struct ppa_addr *ppa_list;
+
+        void *metadata;
+        dma_addr_t dma_metadata;
+
+        uint8_t opcode;
+        uint16_t nr_pages;
+        uint16_t flags;
+};
+
+static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
+{
+        return pdu - sizeof(struct nvm_rq);
+}
+
+static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
+{
+        return rqdata + 1;
+}
+
+struct nvm_block;
+
+typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
+typedef int (nvm_bb_update_fn)(u32, void *, unsigned int, void *);
+typedef int (nvm_id_fn)(struct request_queue *, struct nvm_id *);
+typedef int (nvm_get_l2p_tbl_fn)(struct request_queue *, u64, u32,
+                                nvm_l2p_update_fn *, void *);
+typedef int (nvm_op_bb_tbl_fn)(struct request_queue *, int, unsigned int,
+                                nvm_bb_update_fn *, void *);
+typedef int (nvm_op_set_bb_fn)(struct request_queue *, struct nvm_rq *, int);
+typedef int (nvm_submit_io_fn)(struct request_queue *, struct nvm_rq *);
+typedef int (nvm_erase_blk_fn)(struct request_queue *, struct nvm_rq *);
+typedef void *(nvm_create_dma_pool_fn)(struct request_queue *, char *);
+typedef void (nvm_destroy_dma_pool_fn)(void *);
+typedef void *(nvm_dev_dma_alloc_fn)(struct request_queue *, void *, gfp_t,
+                                                                dma_addr_t *);
+typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
+
+struct nvm_dev_ops {
+        nvm_id_fn               *identity;
+        nvm_get_l2p_tbl_fn      *get_l2p_tbl;
+        nvm_op_bb_tbl_fn        *get_bb_tbl;
+        nvm_op_set_bb_fn        *set_bb;
+
+        nvm_submit_io_fn        *submit_io;
+        nvm_erase_blk_fn        *erase_block;
+
+        nvm_create_dma_pool_fn  *create_dma_pool;
+        nvm_destroy_dma_pool_fn *destroy_dma_pool;
+        nvm_dev_dma_alloc_fn    *dev_dma_alloc;
+        nvm_dev_dma_free_fn     *dev_dma_free;
+
+        uint8_t                 max_phys_sect;
+};
+
+struct nvm_lun {
+        int id;
+
+        int lun_id;
+        int chnl_id;
+
+        unsigned int nr_free_blocks;    /* Number of unused blocks */
+        struct nvm_block *blocks;
+
+        spinlock_t lock;
+};
+
+struct nvm_block {
+        struct list_head list;
+        struct nvm_lun *lun;
+        unsigned long id;
+
+        void *priv;
+        int type;
+};
+
+struct nvm_dev {
+        struct nvm_dev_ops *ops;
+
+        struct list_head devices;
+        struct list_head online_targets;
+
+        /* Media manager */
+        struct nvmm_type *mt;
+        void *mp;
+
+        /* Device information */
+        int nr_chnls;
+        int nr_planes;
+        int luns_per_chnl;
+        int sec_per_pg; /* only sectors for a single page */
+        int pgs_per_blk;
+        int blks_per_lun;
+        int sec_size;
+        int oob_size;
+        int addr_mode;
+        struct nvm_addr_format addr_format;
+
+        /* Calculated/Cached values. These do not reflect the actual usable
+         * blocks at run-time.
+         */
+        int max_rq_size;
+        int plane_mode; /* drive device in single, double or quad mode */
+
+        int sec_per_pl; /* all sectors across planes */
+        int sec_per_blk;
+        int sec_per_lun;
+
+        unsigned long total_pages;
+        unsigned long total_blocks;
+        int nr_luns;
+        unsigned max_pages_per_blk;
+
+        void *ppalist_pool;
+
+        struct nvm_id identity;
+
+        /* Backend device */
+        struct request_queue *q;
+        char name[DISK_NAME_LEN];
+};
+
+/* fallback conversion */
+static struct ppa_addr __generic_to_linear_addr(struct nvm_dev *dev,
+                                                        struct ppa_addr r)
+{
+        struct ppa_addr l;
+
+        l.ppa = r.g.sec +
+                r.g.pg  * dev->sec_per_pg +
+                r.g.blk * (dev->pgs_per_blk *
+                                dev->sec_per_pg) +
+                r.g.lun * (dev->blks_per_lun *
+                                dev->pgs_per_blk *
+                                dev->sec_per_pg) +
+                r.g.ch * (dev->blks_per_lun *
+                                dev->pgs_per_blk *
+                                dev->luns_per_chnl *
+                                dev->sec_per_pg);
+
+        return l;
+}
+
+/* fallback conversion */
+static struct ppa_addr __linear_to_generic_addr(struct nvm_dev *dev,
+                                                        struct ppa_addr r)
+{
+        struct ppa_addr l;
+        int secs, pgs, blks, luns;
+        sector_t ppa = r.ppa;
+
+        l.ppa = 0;
+
+        div_u64_rem(ppa, dev->sec_per_pg, &secs);
+        l.g.sec = secs;
+
+        sector_div(ppa, dev->sec_per_pg);
+        div_u64_rem(ppa, dev->sec_per_blk, &pgs);
+        l.g.pg = pgs;
+
+        sector_div(ppa, dev->pgs_per_blk);
+        div_u64_rem(ppa, dev->blks_per_lun, &blks);
+        l.g.blk = blks;
+
+        sector_div(ppa, dev->blks_per_lun);
+        div_u64_rem(ppa, dev->luns_per_chnl, &luns);
+        l.g.lun = luns;
+
+        sector_div(ppa, dev->luns_per_chnl);
+        l.g.ch = ppa;
+
+        return l;
+}
+
+static struct ppa_addr __generic_to_chnl_addr(struct ppa_addr r)
+{
+        struct ppa_addr l;
+
+        l.ppa = 0;
+
+        l.chnl.sec = r.g.sec;
+        l.chnl.pl = r.g.pl;
+        l.chnl.pg = r.g.pg;
+        l.chnl.blk = r.g.blk;
+        l.chnl.lun = r.g.lun;
+        l.chnl.ch = r.g.ch;
+
+        return l;
+}
+
+static struct ppa_addr __chnl_to_generic_addr(struct ppa_addr r)
+{
+        struct ppa_addr l;
+
+        l.ppa = 0;
+
+        l.g.sec = r.chnl.sec;
+        l.g.pl = r.chnl.pl;
+        l.g.pg = r.chnl.pg;
+        l.g.blk = r.chnl.blk;
+        l.g.lun = r.chnl.lun;
+        l.g.ch = r.chnl.ch;
+
+        return l;
+}
+
+static inline struct ppa_addr addr_to_generic_mode(struct nvm_dev *dev,
+                                                struct ppa_addr gppa)
+{
+        switch (dev->addr_mode) {
+        case NVM_ADDRMODE_LINEAR:
+                return __linear_to_generic_addr(dev, gppa);
+        case NVM_ADDRMODE_CHANNEL:
+                return __chnl_to_generic_addr(gppa);
+        default:
+                BUG();
+        }
+        return gppa;
+}
+
+static inline struct ppa_addr generic_to_addr_mode(struct nvm_dev *dev,
+                                                struct ppa_addr gppa)
+{
+        switch (dev->addr_mode) {
+        case NVM_ADDRMODE_LINEAR:
+                return __generic_to_linear_addr(dev, gppa);
+        case NVM_ADDRMODE_CHANNEL:
+                return __generic_to_chnl_addr(gppa);
+        default:
+                BUG();
+        }
+        return gppa;
+}
+
+static inline int ppa_empty(struct ppa_addr ppa_addr)
+{
+        return (ppa_addr.ppa == ADDR_EMPTY);
+}
+
+static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
+{
+        ppa_addr->ppa = ADDR_EMPTY;
+}
+
+static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev,
+                                                        struct nvm_block *blk)
+{
+        struct ppa_addr ppa;
+        struct nvm_lun *lun = blk->lun;
+
+        ppa.ppa = 0;
+        ppa.g.blk = blk->id % dev->blks_per_lun;
+        ppa.g.lun = lun->lun_id;
+        ppa.g.ch = lun->chnl_id;
+
+        return ppa;
+}
+
+typedef void (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
+typedef sector_t (nvm_tgt_capacity_fn)(void *);
+typedef int (nvm_tgt_end_io_fn)(struct nvm_rq *, int);
+typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int);
+typedef void (nvm_tgt_exit_fn)(void *);
+
+struct nvm_tgt_type {
+        const char *name;
+        unsigned int version[3];
+
+        /* target entry points */
+        nvm_tgt_make_rq_fn *make_rq;
+        nvm_tgt_capacity_fn *capacity;
+        nvm_tgt_end_io_fn *end_io;
+
+        /* module-specific init/teardown */
+        nvm_tgt_init_fn *init;
+        nvm_tgt_exit_fn *exit;
+
+        /* For internal use */
+        struct list_head list;
+};
+
+extern int nvm_register_target(struct nvm_tgt_type *);
+extern void nvm_unregister_target(struct nvm_tgt_type *);
+
+extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
+extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
+
+typedef int (nvmm_register_fn)(struct nvm_dev *);
+typedef void (nvmm_unregister_fn)(struct nvm_dev *);
+typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *,
+                                              struct nvm_lun *, unsigned long);
+typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
+typedef int (nvmm_end_io_fn)(struct nvm_rq *, int);
+typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
+                                                                unsigned long);
+typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
+typedef void (nvmm_free_blocks_print_fn)(struct nvm_dev *);
+
+struct nvmm_type {
+        const char *name;
+        unsigned int version[3];
+
+        nvmm_register_fn *register_mgr;
+        nvmm_unregister_fn *unregister_mgr;
+
+        /* Block administration callbacks */
+        nvmm_get_blk_fn *get_blk;
+        nvmm_put_blk_fn *put_blk;
+        nvmm_open_blk_fn *open_blk;
+        nvmm_close_blk_fn *close_blk;
+        nvmm_flush_blk_fn *flush_blk;
+
+        nvmm_submit_io_fn *submit_io;
+        nvmm_end_io_fn *end_io;
+        nvmm_erase_blk_fn *erase_blk;
+
+        /* Configuration management */
+        nvmm_get_lun_fn *get_lun;
+
+        /* Statistics */
+        nvmm_free_blocks_print_fn *free_blocks_print;
+        struct list_head list;
+};
+
+extern int nvm_register_mgr(struct nvmm_type *);
+extern void nvm_unregister_mgr(struct nvmm_type *);
+
+extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *,
+                                                                unsigned long);
+extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *);
+
+extern int nvm_register(struct request_queue *, char *,
+                                                struct nvm_dev_ops *);
+extern void nvm_unregister(char *);
+
+extern int nvm_submit_io(struct nvm_dev *, struct nvm_rq *);
+extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
+#else /* CONFIG_NVM */
+struct nvm_dev_ops;
+
+static inline int nvm_register(struct request_queue *q, char *disk_name,
+                                                        struct nvm_dev_ops *ops)
+{
+        return -EINVAL;
+}
+static inline void nvm_unregister(char *disk_name) {}
+#endif /* CONFIG_NVM */
+#endif /* LIGHTNVM.H */
diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h
new file mode 100644
index 000000000000..928f98997d8a
--- /dev/null
+++ b/include/uapi/linux/lightnvm.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2015 CNEX Labs.  All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef _UAPI_LINUX_LIGHTNVM_H
+#define _UAPI_LINUX_LIGHTNVM_H
+
+#ifdef __KERNEL__
+#include <linux/kernel.h>
+#include <linux/ioctl.h>
+#else /* __KERNEL__ */
+#include <stdio.h>
+#include <sys/ioctl.h>
+#define DISK_NAME_LEN 32
+#endif /* __KERNEL__ */
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define NVM_TTYPE_NAME_MAX 48
+#define NVM_TTYPE_MAX 63
+
+#define NVM_CTRL_FILE "/dev/lightnvm/control"
+
+struct nvm_ioctl_info_tgt {
+        __u32 version[3];
+        __u32 reserved;
+        char tgtname[NVM_TTYPE_NAME_MAX];
+};
+
+struct nvm_ioctl_info {
+        __u32 version[3];       /* in/out - major, minor, patch */
+        __u16 tgtsize;          /* number of targets */
+        __u16 reserved16;       /* pad to 4K page */
+        __u32 reserved[12];
+        struct nvm_ioctl_info_tgt tgts[NVM_TTYPE_MAX];
+};
+
+enum {
+        NVM_DEVICE_ACTIVE = 1 << 0,
+};
+
+struct nvm_ioctl_device_info {
+        char devname[DISK_NAME_LEN];
+        char bmname[NVM_TTYPE_NAME_MAX];
+        __u32 bmversion[3];
+        __u32 flags;
+        __u32 reserved[8];
+};
+
+struct nvm_ioctl_get_devices {
+        __u32 nr_devices;
+        __u32 reserved[31];
+        struct nvm_ioctl_device_info info[31];
+};
+
+struct nvm_ioctl_create_simple {
+        __u32 lun_begin;
+        __u32 lun_end;
+};
+
+enum {
+        NVM_CONFIG_TYPE_SIMPLE = 0,
+};
+
+struct nvm_ioctl_create_conf {
+        __u32 type;
+        union {
+                struct nvm_ioctl_create_simple s;
+        };
+};
+
+struct nvm_ioctl_create {
+        char dev[DISK_NAME_LEN];                /* open-channel SSD device */
+        char tgttype[NVM_TTYPE_NAME_MAX];       /* target type name */
+        char tgtname[DISK_NAME_LEN];            /* dev to expose target as */
+
+        __u32 flags;
+
+        struct nvm_ioctl_create_conf conf;
+};
+
+struct nvm_ioctl_remove {
+        char tgtname[DISK_NAME_LEN];
+
+        __u32 flags;
+};
+
+
+/* The ioctl type, 'L', 0x20 - 0x2F documented in ioctl-number.txt */
+enum {
+        /* top level cmds */
+        NVM_INFO_CMD = 0x20,
+        NVM_GET_DEVICES_CMD,
+
+        /* device level cmds */
+        NVM_DEV_CREATE_CMD,
+        NVM_DEV_REMOVE_CMD,
+};
+
+#define NVM_IOCTL 'L' /* 0x4c */
+
+#define NVM_INFO                _IOWR(NVM_IOCTL, NVM_INFO_CMD, \
+                                                struct nvm_ioctl_info)
+#define NVM_GET_DEVICES         _IOR(NVM_IOCTL, NVM_GET_DEVICES_CMD, \
+                                                struct nvm_ioctl_get_devices)
+#define NVM_DEV_CREATE          _IOW(NVM_IOCTL, NVM_DEV_CREATE_CMD, \
+                                                struct nvm_ioctl_create)
+#define NVM_DEV_REMOVE          _IOW(NVM_IOCTL, NVM_DEV_REMOVE_CMD, \
+                                                struct nvm_ioctl_remove)
+
+#define NVM_VERSION_MAJOR       1
+#define NVM_VERSION_MINOR       0
+#define NVM_VERSION_PATCHLEVEL  0
+
+#endif