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[PATCH v9 0/5] Support for Open-Channel SSDs

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  [PATCH v9 0/5] Support for Open-Channel SSDs Matias Bjørling <m@bjorling.me> - 2015-10-14 16:50 +0200
    [PATCH v9 2/5] gennvm: Generic NVM manager Matias Bjørling <m@bjorling.me> - 2015-10-14 16:50 +0200

#1246855 — [PATCH v9 0/5] Support for Open-Channel SSDs

This patchset implements support for Open-Channel SSDs.

Applies against Jens' for-next and is available through the lkml_v9 branch at:

  https://github.com/OpenChannelSSD/linux

Changes since v8:
 - Specification was changed to define a SSD configuration using a single entry.
   This replaces the per-lun specification with a single configuration. Easing
   the access to global geometry values and simplifies address calculations.
 - Implement PPA addressing modes. Encode NAND flash structure into physical
   page addresses. An address now has bits reserved for each part of the flash
   units (sectors, page, block, plane, lun, channels), replacing the linear
   address space previously found in the LightNVM specification.
 - Rename bm_hb to gennvm (generic nvm manager). This part now covers any type
   of non-volatile memory media. Thus, it is not only a block manager, but
   manages several pieces of core information.
 - Add detection for CNEX Westlake controller.
 - Completion of I/Os was previously directly completed in the target. Push
   completion through the media manager first and then target.
 - Rebased on top of latest changes to the NVMe device driver architecture.
 - Various fixes and refactoring.

Changes since v7:
 - The IOCTL management interface have been created. Devices can now be
   managed through the lightnvm-adm tool (ladm). This is available from:
     https://github.com/OpenChannelSSD/lightnvm-adm.git
 - The debugging management interface is now only available if debugging
   is enabled. (/sys/module/lnvm/parameters/configure_debug)
 - GCC compatibility fixes (Dongsheng Yang)
 - Fix for BM initialization (Dongsheng Yang)
 - Fix for error during rrpc init (Javier Gonzalez)
 - Refactor NVMe driver to not expect non-standard behavior. Added PCI
   id identification for selected devices (qemu-nvme and cnex).
 - Enable NVMe metadata to be passed from target.
 - Create ioctl interface for management.
 - Add NVM_DEBUG flag to explicit enable/diskable parameter
   configure_debug access. The interface is only available if debugging
   is enabled.
 - Add support for physical block address commands.
 - Added uapi/lightnvm.h header to expose ioctl interface.
 - Fix qemu-nvme initialization extensions regarding L2P translation
   support.
 - Clean up of dead code.
 - Updated e-mails, copyrights, etc.

Changes since v6:
 - Multipage support (Javier Gonzalez)
 - General code cleanups
 - Fixed memleak on register failure

Changes since v5:
Feedback from Christoph Hellwig.
 - Created new null_nvm from null_blk to register itself as a lightnvm
   device.
 - Changed the interface of register/unregister to only take disk_name.
   The gendisk alloc in nvme is kept. Most instantiations will
   involve the device gendisk, therefore wait with refactoring to a
   later time.
 - Renamed global parameters in core.c and rrpc.c

Changes since v4:
 - Remove gendisk->nvm dependency
 - Remove device driver rq private field dependency.
 - Update submission and completion. The flow is now
     Target -> Block Manager -> Device Driver, replacing callbacks in
     device driver.
 - Abstracted out the block manager into its own module. Other block
   managers can now be implemented. For example to support fully
   host-based SSDs.
 - No longer exposes the device driver gendisk to user-space.
 - Management is moved into /sys/modules/lnvm/parameters/configure_debug

Changes since v3:

 - Remove dependency on REQ_NVM_GC
 - Refactor nvme integration to use nvme_submit_sync_cmd for
   internal commands.
 - Fix race condition bug on multiple threads on RRPC target.
 - Rename sysfs entry under the block device from nvm to lightnvm.
   The configuration is found in /sys/block/*/lightnvm/

Changes since v2:

 Feedback from Paul Bolle:
 - Fix license to GPLv2, documentation, compilation.
 Feedback from Keith Busch:
 - nvme: Move lightnvm out and into nvme-lightnvm.c.
 - nvme: Set controller css on lightnvm command set.
 - nvme: Remove OACS.
 Feedback from Christoph Hellwig:
 - lightnvm: Move out of block layer into /drivers/lightnvm/core.c
 - lightnvm: refactor request->phys_sector into device drivers.
 - lightnvm: refactor prep/unprep into device drivers.
 - lightnvm: move nvm_dev from request_queue to gendisk.

 New
 - Bad block table support (From Javier).
 - Update maintainers file.

Changes since v1:

 - Splitted LightNVM into two parts. A get/put interface for flash
   blocks and the respective targets that implement flash translation
   layer logic.
 - Updated the patches according to the LightNVM specification changes.
 - Added interface to add/remove targets for a block device.

Thanks to Jens Axboe, Christoph Hellwig, Keith Busch, Paul Bolle,
Javier Gonzalez and Jesper Madsen for discussions and contributions.

Matias Bjørling (5):
  lightnvm: Support for Open-Channel SSDs
  gennvm: Generic NVM manager
  rrpc: Round-robin sector target with cost-based gc
  null_nvm: LightNVM test driver
  nvme: LightNVM support

 Documentation/ioctl/ioctl-number.txt |    1 +
 MAINTAINERS                          |    8 +
 drivers/Kconfig                      |    2 +
 drivers/Makefile                     |    1 +
 drivers/lightnvm/Kconfig             |   48 ++
 drivers/lightnvm/Makefile            |    8 +
 drivers/lightnvm/core.c              |  856 ++++++++++++++++++++++
 drivers/lightnvm/gennvm.c            |  467 ++++++++++++
 drivers/lightnvm/gennvm.h            |   46 ++
 drivers/lightnvm/null_nvm.c          |  463 ++++++++++++
 drivers/lightnvm/rrpc.c              | 1308 ++++++++++++++++++++++++++++++++++
 drivers/lightnvm/rrpc.h              |  239 +++++++
 drivers/nvme/host/Makefile           |    2 +-
 drivers/nvme/host/lightnvm.c         |  597 ++++++++++++++++
 drivers/nvme/host/nvme.h             |   10 +
 drivers/nvme/host/pci.c              |   39 +-
 include/linux/lightnvm.h             |  516 ++++++++++++++
 include/uapi/linux/lightnvm.h        |  130 ++++
 18 files changed, 4729 insertions(+), 12 deletions(-)
 create mode 100644 drivers/lightnvm/Kconfig
 create mode 100644 drivers/lightnvm/Makefile
 create mode 100644 drivers/lightnvm/core.c
 create mode 100644 drivers/lightnvm/gennvm.c
 create mode 100644 drivers/lightnvm/gennvm.h
 create mode 100644 drivers/lightnvm/null_nvm.c
 create mode 100644 drivers/lightnvm/rrpc.c
 create mode 100644 drivers/lightnvm/rrpc.h
 create mode 100644 drivers/nvme/host/lightnvm.c
 create mode 100644 include/linux/lightnvm.h
 create mode 100644 include/uapi/linux/lightnvm.h

-- 
2.1.4

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#1246857 — [PATCH v9 2/5] gennvm: Generic NVM manager

The implementation for Open-Channel SSDs is divided into media
management and targets. This patch implements a generic media manager
for open-channel SSDs. After a media manager has been initialized,
single or multiple targets can be instantiated with the media managed as
the backend.

Signed-off-by: Matias Bjørling <m@bjorling.me>
---
 drivers/lightnvm/Kconfig  |   7 +
 drivers/lightnvm/Makefile |   1 +
 drivers/lightnvm/gennvm.c | 467 ++++++++++++++++++++++++++++++++++++++++++++++
 drivers/lightnvm/gennvm.h |  46 +++++
 4 files changed, 521 insertions(+)
 create mode 100644 drivers/lightnvm/gennvm.c
 create mode 100644 drivers/lightnvm/gennvm.h

diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig
index d4f309f..2a27971 100644
--- a/drivers/lightnvm/Kconfig
+++ b/drivers/lightnvm/Kconfig
@@ -25,4 +25,11 @@ config NVM_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.
+
 endif # NVM
diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile
index 38185e9..e2428e0 100644
--- a/drivers/lightnvm/Makefile
+++ b/drivers/lightnvm/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_NVM)		:= core.o
+obj-$(CONFIG_NVM_GENNVM) 	+= gennvm.o
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
new file mode 100644
index 0000000..b12c1b2
--- /dev/null
+++ b/drivers/lightnvm/gennvm.c
@@ -0,0 +1,467 @@
+/*
+ * 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 *block;
+	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) {
+		block = &lun->vlun.blocks[i];
+		if (!block) {
+			pr_err("gen_nvm: BB data is out of bounds.\n");
+			return -EINVAL;
+		}
+		list_move_tail(&block->list, &lun->bb_list);
+	}
+
+	return 0;
+}
+
+static int gennvm_block_map(u64 slba, u64 nlb, u64 *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("gen_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]);
+
+		if (unlikely(pba >= max_pages && pba != U64_MAX)) {
+			pr_err("gen_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. It often holds internal device boot
+		 * information.
+		 */
+		if (!pba)
+			continue;
+
+		/* resolve block from physical address */
+		lun_id = 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[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("gen_nvm: 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("gen_nvm: could not read L2P table.\n");
+			pr_warn("gen_nvm: default block initialization");
+		}
+	}
+
+	return 0;
+}
+
+static int gennvm_register(struct nvm_dev *dev)
+{
+	struct gen_nvm *gn;
+	int ret;
+
+	if (!(dev->features.rsp & NVM_RSP_L2P))
+		return 0;
+
+	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("gen_nvm: could not initialize luns\n");
+		goto err;
+	}
+
+	ret = gennvm_blocks_init(dev, gn);
+	if (ret) {
+		pr_err("gen_nvm: 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;
+
+	BUG_ON(!lun);
+
+	spin_lock(&vlun->lock);
+
+	if (list_empty(&lun->free_list)) {
+		pr_err_ratelimited("gen_nvm: 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:
+		BUG();
+	}
+
+	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;
+
+	BUG_ON(ppa->g.ch > dev->nr_chnls);
+	BUG_ON(ppa->g.lun > dev->luns_per_chnl);
+	BUG_ON(ppa->g.blk > dev->blks_per_lun);
+
+	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 void gennvm_end_io(struct nvm_rq *rqd, int error)
+{
+	struct nvm_tgt_instance *ins = rqd->ins;
+
+	if (error == NVM_RSP_ERR_FAILWRITE)
+		gennvm_mark_blk_bad(rqd->dev, rqd);
+
+	ins->tt->end_io(rqd, error);
+}
+
+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("gen_nvm: 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("Block manager for Hybrid Open-Channel SSDs");
diff --git a/drivers/lightnvm/gennvm.h b/drivers/lightnvm/gennvm.h
new file mode 100644
index 0000000..d23bd35
--- /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_ */
-- 
2.1.4

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