path: root/include/linux/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,
};

/* common format */
#define NVM_GEN_CH_BITS  (8)
#define NVM_GEN_LUN_BITS (8)
#define NVM_GEN_BLK_BITS (16)
#define NVM_GEN_RESERVED (32)

/* 1.2 format */
#define NVM_12_PG_BITS  (16)
#define NVM_12_PL_BITS  (4)
#define NVM_12_SEC_BITS (4)
#define NVM_12_RESERVED (8)

/* 2.0 format */
#define NVM_20_SEC_BITS (24)
#define NVM_20_RESERVED (8)

enum {
	NVM_OCSSD_SPEC_12 = 12,
	NVM_OCSSD_SPEC_20 = 20,
};

struct ppa_addr {
	/* Generic structure for all addresses */
	union {
		/* generic device format */
		struct {
			u64 ch		: NVM_GEN_CH_BITS;
			u64 lun		: NVM_GEN_LUN_BITS;
			u64 blk		: NVM_GEN_BLK_BITS;
			u64 reserved	: NVM_GEN_RESERVED;
		} a;

		/* 1.2 device format */
		struct {
			u64 ch		: NVM_GEN_CH_BITS;
			u64 lun		: NVM_GEN_LUN_BITS;
			u64 blk		: NVM_GEN_BLK_BITS;
			u64 pg		: NVM_12_PG_BITS;
			u64 pl		: NVM_12_PL_BITS;
			u64 sec		: NVM_12_SEC_BITS;
			u64 reserved	: NVM_12_RESERVED;
		} g;

		/* 2.0 device format */
		struct {
			u64 grp		: NVM_GEN_CH_BITS;
			u64 pu		: NVM_GEN_LUN_BITS;
			u64 chk		: NVM_GEN_BLK_BITS;
			u64 sec		: NVM_20_SEC_BITS;
			u64 reserved	: NVM_20_RESERVED;
		} m;

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

		u64 ppa;
	};
};

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

typedef int (nvm_id_fn)(struct nvm_dev *);
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_get_chk_meta_fn)(struct nvm_dev *, sector_t, int,
							struct nvm_chk_meta *);
typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *, int);
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_op_bb_tbl_fn	*get_bb_tbl;
	nvm_op_set_bb_fn	*set_bb_tbl;

	nvm_get_chk_meta_fn	*get_chk_meta;

	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;
};

#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_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_addrf_12 {
	u8	ch_len;
	u8	lun_len;
	u8	blk_len;
	u8	pg_len;
	u8	pln_len;
	u8	sec_len;

	u8	ch_offset;
	u8	lun_offset;
	u8	blk_offset;
	u8	pg_offset;
	u8	pln_offset;
	u8	sec_offset;

	u64	ch_mask;
	u64	lun_mask;
	u64	blk_mask;
	u64	pg_mask;
	u64	pln_mask;
	u64	sec_mask;
};

struct nvm_addrf {
	u8	ch_len;
	u8	lun_len;
	u8	chk_len;
	u8	sec_len;
	u8	rsv_len[2];

	u8	ch_offset;
	u8	lun_offset;
	u8	chk_offset;
	u8	sec_offset;
	u8	rsv_off[2];

	u64	ch_mask;
	u64	lun_mask;
	u64	chk_mask;
	u64	sec_mask;
	u64	rsv_mask[2];
};

enum {
	/* Chunk states */
	NVM_CHK_ST_FREE =	1 << 0,
	NVM_CHK_ST_CLOSED =	1 << 1,
	NVM_CHK_ST_OPEN =	1 << 2,
	NVM_CHK_ST_OFFLINE =	1 << 3,

	/* Chunk types */
	NVM_CHK_TP_W_SEQ =	1 << 0,
	NVM_CHK_TP_W_RAN =	1 << 1,
	NVM_CHK_TP_SZ_SPEC =	1 << 4,
};

/*
 * Note: The structure size is linked to nvme_nvm_chk_meta such that the same
 * buffer can be used when converting from little endian to cpu addressing.
 */
struct nvm_chk_meta {
	u8	state;
	u8	type;
	u8	wi;
	u8	rsvd[5];
	u64	slba;
	u64	cnlb;
	u64	wp;
};

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_TARGET_DEFAULT_OP (101)
#define NVM_TARGET_MIN_OP (3)
#define NVM_TARGET_MAX_OP (80)

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

#define NVM_MAX_VLBA (64) /* max logical blocks in a vector command */

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;

	nvm_end_io_fn *end_io;

	uint8_t opcode;
	uint16_t nr_ppas;
	uint16_t flags;

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

	int is_seq; /* Sequential hint flag. 1.2 only */

	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;
}

static inline struct ppa_addr *nvm_rq_to_ppa_list(struct nvm_rq *rqd)
{
	return (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
}

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 */
};

/* Instance geometry */
struct nvm_geo {
	/* device reported version */
	u8	major_ver_id;
	u8	minor_ver_id;

	/* kernel short version */
	u8	version;

	/* instance specific geometry */
	int num_ch;
	int num_lun;		/* per channel */

	/* calculated values */
	int all_luns;		/* across channels */
	int all_chunks;		/* across channels */

	int op;			/* over-provision in instance */

	sector_t total_secs;	/* across channels */

	/* chunk geometry */
	u32	num_chk;	/* chunks per lun */
	u32	clba;		/* sectors per chunk */
	u16	csecs;		/* sector size */
	u16	sos;		/* out-of-band area size */
	bool	ext;		/* metadata in extended data buffer */
	u32	mdts;		/* Max data transfer size*/

	/* device write constrains */
	u32	ws_min;		/* minimum write size */
	u32	ws_opt;		/* optimal write size */
	u32	mw_cunits;	/* distance required for successful read */
	u32	maxoc;		/* maximum open chunks */
	u32	maxocpu;	/* maximum open chunks per parallel unit */

	/* device capabilities */
	u32	mccap;

	/* device timings */
	u32	trdt;		/* Avg. Tread (ns) */
	u32	trdm;		/* Max Tread (ns) */
	u32	tprt;		/* Avg. Tprog (ns) */
	u32	tprm;		/* Max Tprog (ns) */