include/linux/lightnvm.h - arm/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef NVM_H
 #define NVM_H

 #include <linux/blkdev.h>
 #include <linux/types.h>
 #include <uapi/linux/lightnvm.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,
 };

 #define NVM_BLK_BITS (16)
 #define NVM_PG_BITS  (16)
 #define NVM_SEC_BITS (8)
 #define NVM_PL_BITS  (8)
 #define NVM_LUN_BITS (8)
 #define NVM_CH_BITS  (7)

 struct ppa_addr {
 	/* Generic structure for all addresses */
 	union {
 		struct {
 			u64 blk		: NVM_BLK_BITS;
 			u64 pg		: NVM_PG_BITS;
 			u64 sec		: NVM_SEC_BITS;
 			u64 pl		: NVM_PL_BITS;
 			u64 lun		: NVM_LUN_BITS;
 			u64 ch		: NVM_CH_BITS;
 			u64 reserved	: 1;
 		} g;

 		struct {
 			u64 line	: 63;
 			u64 is_cached	: 1;
 		} c;

 		u64 ppa;
 	};
 };

 struct nvm_rq;
 struct nvm_id;
 struct nvm_dev;
 struct nvm_tgt_dev;

 typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
 typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
 typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
 				nvm_l2p_update_fn *, void *);
 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
 typedef void (nvm_destroy_dma_pool_fn)(void *);
 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, 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_tbl;

 	nvm_submit_io_fn	*submit_io;

 	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;

 	unsigned int		max_phys_sect;
 };

 #ifdef CONFIG_NVM

 #include <linux/blkdev.h>
 #include <linux/file.h>
 #include <linux/dmapool.h>
 #include <uapi/linux/lightnvm.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	= 1,
 	NVM_PLANE_DOUBLE	= 2,
 	NVM_PLANE_QUAD		= 4,

 	/* Status codes */
 	NVM_RSP_SUCCESS		= 0x0,
 	NVM_RSP_NOT_CHANGEABLE	= 0x1,
 	NVM_RSP_ERR_FAILWRITE	= 0x40ff,
 	NVM_RSP_ERR_EMPTYPAGE	= 0x42ff,
 	NVM_RSP_ERR_FAILECC	= 0x4281,
 	NVM_RSP_ERR_FAILCRC	= 0x4004,
 	NVM_RSP_WARN_HIGHECC	= 0x4700,

 	/* 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,

 	/* NAND Access Modes */
 	NVM_IO_SUSPEND		= 0x80,
 	NVM_IO_SLC_MODE		= 0x100,
 	NVM_IO_SCRAMBLE_ENABLE	= 0x200,

 	/* Block Types */
 	NVM_BLK_T_FREE		= 0x0,
 	NVM_BLK_T_BAD		= 0x1,
 	NVM_BLK_T_GRWN_BAD	= 0x2,
 	NVM_BLK_T_DEV		= 0x4,
 	NVM_BLK_T_HOST		= 0x8,

 	/* Memory capabilities */
 	NVM_ID_CAP_SLC		= 0x1,
 	NVM_ID_CAP_CMD_SUSPEND	= 0x2,
 	NVM_ID_CAP_SCRAMBLE	= 0x4,
 	NVM_ID_CAP_ENCRYPT	= 0x8,

 	/* Memory types */
 	NVM_ID_FMTYPE_SLC	= 0,
 	NVM_ID_FMTYPE_MLC	= 1,

 	/* Device capabilities */
 	NVM_ID_DCAP_BBLKMGMT	= 0x1,
 	NVM_UD_DCAP_ECC		= 0x2,
 };

 struct nvm_id_lp_mlc {
 	u16	num_pairs;
 	u8	pairs[886];
 };

 struct nvm_id_lp_tbl {
 	__u8	id[8];
 	struct nvm_id_lp_mlc mlc;
 };

 struct nvm_id_group {
 	u8	mtype;
 	u8	fmtype;
 	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;
 	u32	mccap;
 	u16	cpar;

 	struct nvm_id_lp_tbl lptbl;
 };

 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;
 };

 struct nvm_id {
 	u8	ver_id;
 	u8	vmnt;
 	u32	cap;
 	u32	dom;
 	struct nvm_addr_format ppaf;
 	struct nvm_id_group grp;
 } __packed;

 struct nvm_target {
 	struct list_head list;
 	struct nvm_tgt_dev *dev;
 	struct nvm_tgt_type *type;
 	struct gendisk *disk;
 };

 #define ADDR_EMPTY (~0ULL)

 #define NVM_VERSION_MAJOR 1
 #define NVM_VERSION_MINOR 0
 #define NVM_VERSION_PATCH 0

 struct nvm_rq;
 typedef void (nvm_end_io_fn)(struct nvm_rq *);

 struct nvm_rq {
 	struct nvm_tgt_dev *dev;

 	struct bio *bio;

 	union {
 		struct ppa_addr ppa_addr;
 		dma_addr_t dma_ppa_list;
 	};

 	struct ppa_addr *ppa_list;

 	void *meta_list;
 	dma_addr_t dma_meta_list;

 	struct completion *wait;
 	nvm_end_io_fn *end_io;

 	uint8_t opcode;
 	uint16_t nr_ppas;
 	uint16_t flags;

 	u64 ppa_status; /* ppa media status */
 	int error;

 	void *private;
 };

 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;
 }

 enum {
 	NVM_BLK_ST_FREE =	0x1,	/* Free block */
 	NVM_BLK_ST_TGT =	0x2,	/* Block in use by target */
 	NVM_BLK_ST_BAD =	0x8,	/* Bad block */
 };

 /* Device generic information */
 struct nvm_geo {
 	int nr_chnls;
 	int nr_luns;
 	int luns_per_chnl; /* -1 if channels are not symmetric */
 	int nr_planes;
 	int sec_per_pg; /* only sectors for a single page */
 	int pgs_per_blk;
 	int blks_per_lun;
 	int fpg_size;
 	int pfpg_size; /* size of buffer if all pages are to be read */
 	int sec_size;
 	int oob_size;
 	int mccap;
 	struct nvm_addr_format ppaf;

 	/* 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;
 };

 /* sub-device structure */
 struct nvm_tgt_dev {
 	/* Device information */
 	struct nvm_geo geo;

 	/* Base ppas for target LUNs */
 	struct ppa_addr *luns;

 	sector_t total_secs;

 	struct nvm_id identity;
 	struct request_queue *q;

 	struct nvm_dev *parent;
 	void *map;
 };

 struct nvm_dev {
 	struct nvm_dev_ops *ops;

 	struct list_head devices;

 	/* Device information */
 	struct nvm_geo geo;

 	  /* lower page table */
 	int lps_per_blk;
 	int *lptbl;

 	unsigned long total_secs;

 	unsigned long *lun_map;
 	void *dma_pool;

 	struct nvm_id identity;

 	/* Backend device */
 	struct request_queue *q;
 	char name[DISK_NAME_LEN];
 	void *private_data;

 	void *rmap;

 	struct mutex mlock;
 	spinlock_t lock;

 	/* target management */
 	struct list_head area_list;
 	struct list_head targets;
 };

 static inline struct ppa_addr linear_to_generic_addr(struct nvm_geo *geo,
 						     u64 pba)
 {
 	struct ppa_addr l;
 	int secs, pgs, blks, luns;
 	sector_t ppa = pba;

 	l.ppa = 0;

 	div_u64_rem(ppa, geo->sec_per_pg, &secs);
 	l.g.sec = secs;

 	sector_div(ppa, geo->sec_per_pg);
 	div_u64_rem(ppa, geo->pgs_per_blk, &pgs);
 	l.g.pg = pgs;

 	sector_div(ppa, geo->pgs_per_blk);
 	div_u64_rem(ppa, geo->blks_per_lun, &blks);
 	l.g.blk = blks;

 	sector_div(ppa, geo->blks_per_lun);
 	div_u64_rem(ppa, geo->luns_per_chnl, &luns);
 	l.g.lun = luns;

 	sector_div(ppa, geo->luns_per_chnl);
 	l.g.ch = ppa;

 	return l;
 }

 static inline struct ppa_addr generic_to_dev_addr(struct nvm_tgt_dev *tgt_dev,
 						  struct ppa_addr r)
 {
 	struct nvm_geo *geo = &tgt_dev->geo;
 	struct ppa_addr l;

 	l.ppa = ((u64)r.g.blk) << geo->ppaf.blk_offset;
 	l.ppa |= ((u64)r.g.pg) << geo->ppaf.pg_offset;
 	l.ppa |= ((u64)r.g.sec) << geo->ppaf.sect_offset;
 	l.ppa |= ((u64)r.g.pl) << geo->ppaf.pln_offset;
 	l.ppa |= ((u64)r.g.lun) << geo->ppaf.lun_offset;
 	l.ppa |= ((u64)r.g.ch) << geo->ppaf.ch_offset;

 	return l;
 }

 static inline struct ppa_addr dev_to_generic_addr(struct nvm_tgt_dev *tgt_dev,
 						  struct ppa_addr r)
 {
 	struct nvm_geo *geo = &tgt_dev->geo;
 	struct ppa_addr l;

 	l.ppa = 0;
 	/*
 	 * (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
 	 */
 	l.g.blk = (r.ppa >> geo->ppaf.blk_offset) &
 					(((1 << geo->ppaf.blk_len) - 1));
 	l.g.pg |= (r.ppa >> geo->ppaf.pg_offset) &
 					(((1 << geo->ppaf.pg_len) - 1));
 	l.g.sec |= (r.ppa >> geo->ppaf.sect_offset) &
 					(((1 << geo->ppaf.sect_len) - 1));
 	l.g.pl |= (r.ppa >> geo->ppaf.pln_offset) &
 					(((1 << geo->ppaf.pln_len) - 1));
 	l.g.lun |= (r.ppa >> geo->ppaf.lun_offset) &
 					(((1 << geo->ppaf.lun_len) - 1));
 	l.g.ch |= (r.ppa >> geo->ppaf.ch_offset) &
 					(((1 << geo->ppaf.ch_len) - 1));

 	return l;
 }

 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 int ppa_cmp_blk(struct ppa_addr ppa1, struct ppa_addr ppa2)
 {
 	if (ppa_empty(ppa1) || ppa_empty(ppa2))
 		return 0;

 	return ((ppa1.g.ch == ppa2.g.ch) && (ppa1.g.lun == ppa2.g.lun) &&
 					(ppa1.g.blk == ppa2.g.blk));
 }

 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 typedef sector_t (nvm_tgt_capacity_fn)(void *);
 typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *,
 				int flags);
 typedef void (nvm_tgt_exit_fn)(void *);
 typedef int (nvm_tgt_sysfs_init_fn)(struct gendisk *);
 typedef void (nvm_tgt_sysfs_exit_fn)(struct gendisk *);

 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;

 	/* module-specific init/teardown */
 	nvm_tgt_init_fn *init;
 	nvm_tgt_exit_fn *exit;

 	/* sysfs */
 	nvm_tgt_sysfs_init_fn *sysfs_init;
 	nvm_tgt_sysfs_exit_fn *sysfs_exit;

 	/* For internal use */
 	struct list_head list;
 };

 extern struct nvm_tgt_type *nvm_find_target_type(const char *, int);

 extern int nvm_register_tgt_type(struct nvm_tgt_type *);
 extern void nvm_unregister_tgt_type(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);

 extern struct nvm_dev *nvm_alloc_dev(int);
 extern int nvm_register(struct nvm_dev *);
 extern void nvm_unregister(struct nvm_dev *);

 extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *,
 			      int, int);
 extern int nvm_max_phys_sects(struct nvm_tgt_dev *);
 extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *);
 extern int nvm_erase_sync(struct nvm_tgt_dev *, struct ppa_addr *, int);
 extern int nvm_set_rqd_ppalist(struct nvm_tgt_dev *, struct nvm_rq *,
 					const struct ppa_addr *, int, int);
 extern void nvm_free_rqd_ppalist(struct nvm_tgt_dev *, struct nvm_rq *);
 extern int nvm_get_l2p_tbl(struct nvm_tgt_dev *, u64, u32, nvm_l2p_update_fn *,
 			   void *);
 extern int nvm_get_area(struct nvm_tgt_dev *, sector_t *, sector_t);
 extern void nvm_put_area(struct nvm_tgt_dev *, sector_t);
 extern void nvm_end_io(struct nvm_rq *);
 extern int nvm_bb_tbl_fold(struct nvm_dev *, u8 *, int);
 extern int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr, u8 *);

 extern int nvm_dev_factory(struct nvm_dev *, int flags);

 extern void nvm_part_to_tgt(struct nvm_dev *, sector_t *, int);

 #else /* CONFIG_NVM */
 struct nvm_dev_ops;

 static inline struct nvm_dev *nvm_alloc_dev(int node)
 {
 	return ERR_PTR(-EINVAL);
 }
 static inline int nvm_register(struct nvm_dev *dev)
 {
 	return -EINVAL;
 }
 static inline void nvm_unregister(struct nvm_dev *dev) {}
 #endif /* CONFIG_NVM */
 #endif /* LIGHTNVM.H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef NVM_H
	#define NVM_H

	#include <linux/blkdev.h>
	#include <linux/types.h>
	#include <uapi/linux/lightnvm.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,
	};

	#define NVM_BLK_BITS (16)
	#define NVM_PG_BITS (16)
	#define NVM_SEC_BITS (8)
	#define NVM_PL_BITS (8)
	#define NVM_LUN_BITS (8)
	#define NVM_CH_BITS (7)

	struct ppa_addr {
	/* Generic structure for all addresses */
	union {
	struct {
	u64 blk : NVM_BLK_BITS;
	u64 pg : NVM_PG_BITS;
	u64 sec : NVM_SEC_BITS;
	u64 pl : NVM_PL_BITS;
	u64 lun : NVM_LUN_BITS;
	u64 ch : NVM_CH_BITS;
	u64 reserved : 1;
	} g;

	struct {
	u64 line : 63;
	u64 is_cached : 1;
	} c;

	u64 ppa;
	};
	};

	struct nvm_rq;
	struct nvm_id;
	struct nvm_dev;
	struct nvm_tgt_dev;

	typedef int (nvm_l2p_update_fn)(u64, u32, __le64 , void );
	typedef int (nvm_id_fn)(struct nvm_dev , struct nvm_id );
	typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
	nvm_l2p_update_fn , void );
	typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev , struct ppa_addr, u8 );
	typedef int (nvm_op_set_bb_fn)(struct nvm_dev , struct ppa_addr , int, int);
	typedef int (nvm_submit_io_fn)(struct nvm_dev , struct nvm_rq );
	typedef void (nvm_create_dma_pool_fn)(struct nvm_dev , char *);
	typedef void (nvm_destroy_dma_pool_fn)(void *);
	typedef void (nvm_dev_dma_alloc_fn)(struct nvm_dev , 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_tbl;

	nvm_submit_io_fn *submit_io;

	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;

	unsigned int max_phys_sect;
	};

	#ifdef CONFIG_NVM

	#include <linux/blkdev.h>
	#include <linux/file.h>
	#include <linux/dmapool.h>
	#include <uapi/linux/lightnvm.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 = 1,
	NVM_PLANE_DOUBLE = 2,
	NVM_PLANE_QUAD = 4,

	/* Status codes */
	NVM_RSP_SUCCESS = 0x0,
	NVM_RSP_NOT_CHANGEABLE = 0x1,
	NVM_RSP_ERR_FAILWRITE = 0x40ff,
	NVM_RSP_ERR_EMPTYPAGE = 0x42ff,
	NVM_RSP_ERR_FAILECC = 0x4281,
	NVM_RSP_ERR_FAILCRC = 0x4004,
	NVM_RSP_WARN_HIGHECC = 0x4700,

	/* 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,

	/* NAND Access Modes */
	NVM_IO_SUSPEND = 0x80,
	NVM_IO_SLC_MODE = 0x100,
	NVM_IO_SCRAMBLE_ENABLE = 0x200,

	/* Block Types */
	NVM_BLK_T_FREE = 0x0,
	NVM_BLK_T_BAD = 0x1,
	NVM_BLK_T_GRWN_BAD = 0x2,
	NVM_BLK_T_DEV = 0x4,
	NVM_BLK_T_HOST = 0x8,

	/* Memory capabilities */
	NVM_ID_CAP_SLC = 0x1,
	NVM_ID_CAP_CMD_SUSPEND = 0x2,
	NVM_ID_CAP_SCRAMBLE = 0x4,
	NVM_ID_CAP_ENCRYPT = 0x8,

	/* Memory types */
	NVM_ID_FMTYPE_SLC = 0,
	NVM_ID_FMTYPE_MLC = 1,

	/* Device capabilities */
	NVM_ID_DCAP_BBLKMGMT = 0x1,
	NVM_UD_DCAP_ECC = 0x2,
	};

	struct nvm_id_lp_mlc {
	u16 num_pairs;
	u8 pairs[886];
	};

	struct nvm_id_lp_tbl {
	__u8 id[8];
	struct nvm_id_lp_mlc mlc;
	};

	struct nvm_id_group {
	u8 mtype;
	u8 fmtype;
	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;
	u32 mccap;
	u16 cpar;

	struct nvm_id_lp_tbl lptbl;
	};

	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;
	};

	struct nvm_id {
	u8 ver_id;
	u8 vmnt;
	u32 cap;
	u32 dom;
	struct nvm_addr_format ppaf;
	struct nvm_id_group grp;
	} __packed;

	struct nvm_target {
	struct list_head list;
	struct nvm_tgt_dev *dev;
	struct nvm_tgt_type *type;
	struct gendisk *disk;
	};

	#define ADDR_EMPTY (~0ULL)

	#define NVM_VERSION_MAJOR 1
	#define NVM_VERSION_MINOR 0
	#define NVM_VERSION_PATCH 0

	struct nvm_rq;
	typedef void (nvm_end_io_fn)(struct nvm_rq *);

	struct nvm_rq {
	struct nvm_tgt_dev *dev;

	struct bio *bio;

	union {
	struct ppa_addr ppa_addr;
	dma_addr_t dma_ppa_list;
	};

	struct ppa_addr *ppa_list;

	void *meta_list;
	dma_addr_t dma_meta_list;

	struct completion *wait;
	nvm_end_io_fn *end_io;

	uint8_t opcode;
	uint16_t nr_ppas;
	uint16_t flags;

	u64 ppa_status; /* ppa media status */
	int error;

	void *private;
	};

	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;
	}

	enum {
	NVM_BLK_ST_FREE = 0x1, /* Free block */
	NVM_BLK_ST_TGT = 0x2, /* Block in use by target */
	NVM_BLK_ST_BAD = 0x8, /* Bad block */
	};

	/* Device generic information */
	struct nvm_geo {
	int nr_chnls;
	int nr_luns;
	int luns_per_chnl; /* -1 if channels are not symmetric */
	int nr_planes;
	int sec_per_pg; /* only sectors for a single page */
	int pgs_per_blk;
	int blks_per_lun;
	int fpg_size;
	int pfpg_size; /* size of buffer if all pages are to be read */
	int sec_size;
	int oob_size;
	int mccap;
	struct nvm_addr_format ppaf;

	/* 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;
	};

	/* sub-device structure */
	struct nvm_tgt_dev {
	/* Device information */
	struct nvm_geo geo;

	/* Base ppas for target LUNs */
	struct ppa_addr *luns;

	sector_t total_secs;

	struct nvm_id identity;
	struct request_queue *q;

	struct nvm_dev *parent;
	void *map;
	};

	struct nvm_dev {
	struct nvm_dev_ops *ops;

	struct list_head devices;

	/* Device information */
	struct nvm_geo geo;

	/* lower page table */
	int lps_per_blk;
	int *lptbl;

	unsigned long total_secs;

	unsigned long *lun_map;
	void *dma_pool;

	struct nvm_id identity;

	/* Backend device */
	struct request_queue *q;
	char name[DISK_NAME_LEN];
	void *private_data;

	void *rmap;

	struct mutex mlock;
	spinlock_t lock;

	/* target management */
	struct list_head area_list;
	struct list_head targets;
	};

	static inline struct ppa_addr linear_to_generic_addr(struct nvm_geo *geo,
	u64 pba)
	{
	struct ppa_addr l;
	int secs, pgs, blks, luns;
	sector_t ppa = pba;

	l.ppa = 0;

	div_u64_rem(ppa, geo->sec_per_pg, &secs);
	l.g.sec = secs;

	sector_div(ppa, geo->sec_per_pg);
	div_u64_rem(ppa, geo->pgs_per_blk, &pgs);
	l.g.pg = pgs;

	sector_div(ppa, geo->pgs_per_blk);
	div_u64_rem(ppa, geo->blks_per_lun, &blks);
	l.g.blk = blks;

	sector_div(ppa, geo->blks_per_lun);
	div_u64_rem(ppa, geo->luns_per_chnl, &luns);
	l.g.lun = luns;

	sector_div(ppa, geo->luns_per_chnl);
	l.g.ch = ppa;

	return l;
	}

	static inline struct ppa_addr generic_to_dev_addr(struct nvm_tgt_dev *tgt_dev,
	struct ppa_addr r)
	{
	struct nvm_geo *geo = &tgt_dev->geo;
	struct ppa_addr l;

	l.ppa = ((u64)r.g.blk) << geo->ppaf.blk_offset;
	l.ppa \|= ((u64)r.g.pg) << geo->ppaf.pg_offset;
	l.ppa \|= ((u64)r.g.sec) << geo->ppaf.sect_offset;
	l.ppa \|= ((u64)r.g.pl) << geo->ppaf.pln_offset;
	l.ppa \|= ((u64)r.g.lun) << geo->ppaf.lun_offset;
	l.ppa \|= ((u64)r.g.ch) << geo->ppaf.ch_offset;

	return l;
	}

	static inline struct ppa_addr dev_to_generic_addr(struct nvm_tgt_dev *tgt_dev,
	struct ppa_addr r)
	{
	struct nvm_geo *geo = &tgt_dev->geo;
	struct ppa_addr l;

	l.ppa = 0;
	/*
	* (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
	*/
	l.g.blk = (r.ppa >> geo->ppaf.blk_offset) &
	(((1 << geo->ppaf.blk_len) - 1));
	l.g.pg \|= (r.ppa >> geo->ppaf.pg_offset) &
	(((1 << geo->ppaf.pg_len) - 1));
	l.g.sec \|= (r.ppa >> geo->ppaf.sect_offset) &
	(((1 << geo->ppaf.sect_len) - 1));
	l.g.pl \|= (r.ppa >> geo->ppaf.pln_offset) &
	(((1 << geo->ppaf.pln_len) - 1));
	l.g.lun \|= (r.ppa >> geo->ppaf.lun_offset) &
	(((1 << geo->ppaf.lun_len) - 1));
	l.g.ch \|= (r.ppa >> geo->ppaf.ch_offset) &
	(((1 << geo->ppaf.ch_len) - 1));

	return l;
	}

	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 int ppa_cmp_blk(struct ppa_addr ppa1, struct ppa_addr ppa2)
	{
	if (ppa_empty(ppa1) \|\| ppa_empty(ppa2))
	return 0;

	return ((ppa1.g.ch == ppa2.g.ch) && (ppa1.g.lun == ppa2.g.lun) &&
	(ppa1.g.blk == ppa2.g.blk));
	}

	typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue , struct bio );
	typedef sector_t (nvm_tgt_capacity_fn)(void *);
	typedef void (nvm_tgt_init_fn)(struct nvm_tgt_dev , struct gendisk *,
	int flags);
	typedef void (nvm_tgt_exit_fn)(void *);
	typedef int (nvm_tgt_sysfs_init_fn)(struct gendisk *);
	typedef void (nvm_tgt_sysfs_exit_fn)(struct gendisk *);

	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;

	/* module-specific init/teardown */
	nvm_tgt_init_fn *init;
	nvm_tgt_exit_fn *exit;

	/* sysfs */
	nvm_tgt_sysfs_init_fn *sysfs_init;
	nvm_tgt_sysfs_exit_fn *sysfs_exit;

	/* For internal use */
	struct list_head list;
	};

	extern struct nvm_tgt_type nvm_find_target_type(const char , int);

	extern int nvm_register_tgt_type(struct nvm_tgt_type *);
	extern void nvm_unregister_tgt_type(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);

	extern struct nvm_dev *nvm_alloc_dev(int);
	extern int nvm_register(struct nvm_dev *);
	extern void nvm_unregister(struct nvm_dev *);

	extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev , struct ppa_addr ,
	int, int);
	extern int nvm_max_phys_sects(struct nvm_tgt_dev *);
	extern int nvm_submit_io(struct nvm_tgt_dev , struct nvm_rq );
	extern int nvm_erase_sync(struct nvm_tgt_dev , struct ppa_addr , int);
	extern int nvm_set_rqd_ppalist(struct nvm_tgt_dev , struct nvm_rq ,
	const struct ppa_addr *, int, int);
	extern void nvm_free_rqd_ppalist(struct nvm_tgt_dev , struct nvm_rq );
	extern int nvm_get_l2p_tbl(struct nvm_tgt_dev , u64, u32, nvm_l2p_update_fn ,
	void *);
	extern int nvm_get_area(struct nvm_tgt_dev , sector_t , sector_t);
	extern void nvm_put_area(struct nvm_tgt_dev *, sector_t);
	extern void nvm_end_io(struct nvm_rq *);
	extern int nvm_bb_tbl_fold(struct nvm_dev , u8 , int);
	extern int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev , struct ppa_addr, u8 );

	extern int nvm_dev_factory(struct nvm_dev *, int flags);

	extern void nvm_part_to_tgt(struct nvm_dev , sector_t , int);

	#else /* CONFIG_NVM */
	struct nvm_dev_ops;

	static inline struct nvm_dev *nvm_alloc_dev(int node)
	{
	return ERR_PTR(-EINVAL);
	}
	static inline int nvm_register(struct nvm_dev *dev)
	{
	return -EINVAL;
	}
	static inline void nvm_unregister(struct nvm_dev *dev) {}
	#endif /* CONFIG_NVM */
	#endif /* LIGHTNVM.H */