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kernel-ark/include/linux/lightnvm.h
Javier González 4af3f75d79 lightnvm: allow to init targets on factory mode 
Target initialization has two responsibilities: creating the target
partition and instantiating the target. This patch enables to create a
factory partition (e.g., do not trigger recovery on the given target).
This is useful for target development and for being able to restore the
device state at any moment in time without requiring a full-device
erase.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-16 10:06:25 -06:00

511 lines
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C
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#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 */
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