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alistair23-linux/include/linux/lightnvm.h
Matias Bjørling ca5927e7ab lightnvm: introduce mlc lower page table mappings 
NAND MLC memories have both lower and upper pages. When programming,
both of these must be written, before data can be read. However,
these lower and upper pages might not placed at even and odd flash
pages, but can be skipped. Therefore each flash memory has its lower
pages defined, which can then be used when programming and to know when
padding are necessary.

This patch implements the lower page definition in the specification,
and exposes it through a simple lookup table at dev->lptbl.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-01-12 08:21:17 -07:00

503 lines
12 KiB
C
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#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,
/* NAND Access Modes */
NVM_IO_SUSPEND = 0x80,
NVM_IO_SLC_MODE = 0x100,
NVM_IO_SCRAMBLE_DISABLE = 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,
};
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;
u8 cgrps;
u32 cap;
u32 dom;
struct nvm_addr_format ppaf;
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_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 (8)
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;
} g;
u64 ppa;
};
};
struct nvm_rq;
typedef void (nvm_end_io_fn)(struct nvm_rq *);
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;
struct completion *wait;
nvm_end_io_fn *end_io;
uint8_t opcode;
uint16_t nr_pages;
uint16_t flags;
int error;
};
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)(struct ppa_addr, int, u8 *, 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, int,
nvm_bb_update_fn *, void *);
typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct nvm_rq *, int);
typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
typedef int (nvm_erase_blk_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_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;
unsigned int max_phys_sect;
};
struct nvm_lun {
int id;
int lun_id;
int chnl_id;
/* It is up to the target to mark blocks as closed. If the target does
* not do it, all blocks are marked as open, and nr_open_blocks
* represents the number of blocks in use
*/
unsigned int nr_open_blocks; /* Number of used, writable blocks */
unsigned int nr_closed_blocks; /* Number of used, read-only blocks */
unsigned int nr_free_blocks; /* Number of unused blocks */
unsigned int nr_bad_blocks; /* Number of bad blocks */
spinlock_t lock;
struct nvm_block *blocks;
};
enum {
NVM_BLK_ST_FREE = 0x1, /* Free block */
NVM_BLK_ST_OPEN = 0x2, /* Open block - read-write */
NVM_BLK_ST_CLOSED = 0x4, /* Closed block - read-only */
NVM_BLK_ST_BAD = 0x8, /* Bad block */
};
struct nvm_block {
struct list_head list;
struct nvm_lun *lun;
unsigned long id;
void *priv;
int state;
};
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 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;
/* lower page table */
int lps_per_blk;
int *lptbl;
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];
};
static inline struct ppa_addr generic_to_dev_addr(struct nvm_dev *dev,
struct ppa_addr r)
{
struct ppa_addr l;
l.ppa = ((u64)r.g.blk) << dev->ppaf.blk_offset;
l.ppa |= ((u64)r.g.pg) << dev->ppaf.pg_offset;
l.ppa |= ((u64)r.g.sec) << dev->ppaf.sect_offset;
l.ppa |= ((u64)r.g.pl) << dev->ppaf.pln_offset;
l.ppa |= ((u64)r.g.lun) << dev->ppaf.lun_offset;
l.ppa |= ((u64)r.g.ch) << dev->ppaf.ch_offset;
return l;
}
static inline struct ppa_addr dev_to_generic_addr(struct nvm_dev *dev,
struct ppa_addr r)
{
struct ppa_addr l;
/*
* (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
*/
l.g.blk = (r.ppa >> dev->ppaf.blk_offset) &
(((1 << dev->ppaf.blk_len) - 1));
l.g.pg |= (r.ppa >> dev->ppaf.pg_offset) &
(((1 << dev->ppaf.pg_len) - 1));
l.g.sec |= (r.ppa >> dev->ppaf.sect_offset) &
(((1 << dev->ppaf.sect_len) - 1));
l.g.pl |= (r.ppa >> dev->ppaf.pln_offset) &
(((1 << dev->ppaf.pln_len) - 1));
l.g.lun |= (r.ppa >> dev->ppaf.lun_offset) &
(((1 << dev->ppaf.lun_len) - 1));
l.g.ch |= (r.ppa >> dev->ppaf.ch_offset) &
(((1 << dev->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 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 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_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_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_lun_info_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_unlocked;
nvmm_put_blk_fn *put_blk_unlocked;
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_erase_blk_fn *erase_blk;
/* Configuration management */
nvmm_get_lun_fn *get_lun;
/* Statistics */
nvmm_lun_info_print_fn *lun_info_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_unlocked(struct nvm_dev *,
struct nvm_lun *, unsigned long);
extern void nvm_put_blk_unlocked(struct nvm_dev *, struct nvm_block *);
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 void nvm_generic_to_addr_mode(struct nvm_dev *, struct nvm_rq *);
extern void nvm_addr_to_generic_mode(struct nvm_dev *, struct nvm_rq *);
extern int nvm_set_rqd_ppalist(struct nvm_dev *, struct nvm_rq *,
struct ppa_addr *, int);
extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
extern int nvm_erase_ppa(struct nvm_dev *, struct ppa_addr *, int);
extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
extern void nvm_end_io(struct nvm_rq *, int);
extern int nvm_submit_ppa(struct nvm_dev *, struct ppa_addr *, int, int, int,
void *, int);
#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 */
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