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alistair23-linux/include/linux/lightnvm.h
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

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/* 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 */
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