include/linux/lightnvm.h - kernel/msm-4.9 - Gitiles

 #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 blk_qc_t (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 */
	#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 blk_qc_t (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 */