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Matias Bjørlingcd9e9802015-10-28 19:54:55 +01001#ifndef NVM_H
2#define NVM_H
3
Jens Axboea7fd9a42016-01-13 13:04:11 -07004#include <linux/types.h>
5
Matias Bjørlingcd9e9802015-10-28 19:54:55 +01006enum {
7 NVM_IO_OK = 0,
8 NVM_IO_REQUEUE = 1,
9 NVM_IO_DONE = 2,
10 NVM_IO_ERR = 3,
11
12 NVM_IOTYPE_NONE = 0,
13 NVM_IOTYPE_GC = 1,
14};
15
Jens Axboea7fd9a42016-01-13 13:04:11 -070016#define NVM_BLK_BITS (16)
17#define NVM_PG_BITS (16)
18#define NVM_SEC_BITS (8)
19#define NVM_PL_BITS (8)
20#define NVM_LUN_BITS (8)
21#define NVM_CH_BITS (8)
22
23struct ppa_addr {
24 /* Generic structure for all addresses */
25 union {
26 struct {
27 u64 blk : NVM_BLK_BITS;
28 u64 pg : NVM_PG_BITS;
29 u64 sec : NVM_SEC_BITS;
30 u64 pl : NVM_PL_BITS;
31 u64 lun : NVM_LUN_BITS;
32 u64 ch : NVM_CH_BITS;
33 } g;
34
35 u64 ppa;
36 };
37};
38
39struct nvm_rq;
40struct nvm_id;
41struct nvm_dev;
42
43typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
44typedef int (nvm_bb_update_fn)(struct ppa_addr, int, u8 *, void *);
45typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
46typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
47 nvm_l2p_update_fn *, void *);
48typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, int,
49 nvm_bb_update_fn *, void *);
50typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct nvm_rq *, int);
51typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
52typedef int (nvm_erase_blk_fn)(struct nvm_dev *, struct nvm_rq *);
53typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
54typedef void (nvm_destroy_dma_pool_fn)(void *);
55typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
56 dma_addr_t *);
57typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
58
59struct nvm_dev_ops {
60 nvm_id_fn *identity;
61 nvm_get_l2p_tbl_fn *get_l2p_tbl;
62 nvm_op_bb_tbl_fn *get_bb_tbl;
63 nvm_op_set_bb_fn *set_bb_tbl;
64
65 nvm_submit_io_fn *submit_io;
66 nvm_erase_blk_fn *erase_block;
67
68 nvm_create_dma_pool_fn *create_dma_pool;
69 nvm_destroy_dma_pool_fn *destroy_dma_pool;
70 nvm_dev_dma_alloc_fn *dev_dma_alloc;
71 nvm_dev_dma_free_fn *dev_dma_free;
72
73 unsigned int max_phys_sect;
74};
75
76
77
Matias Bjørlingcd9e9802015-10-28 19:54:55 +010078#ifdef CONFIG_NVM
79
80#include <linux/blkdev.h>
Matias Bjørlingcd9e9802015-10-28 19:54:55 +010081#include <linux/file.h>
82#include <linux/dmapool.h>
Matias Bjørlinge3eb3792016-01-12 07:49:36 +010083#include <uapi/linux/lightnvm.h>
Matias Bjørlingcd9e9802015-10-28 19:54:55 +010084
85enum {
86 /* HW Responsibilities */
87 NVM_RSP_L2P = 1 << 0,
88 NVM_RSP_ECC = 1 << 1,
89
90 /* Physical Adressing Mode */
91 NVM_ADDRMODE_LINEAR = 0,
92 NVM_ADDRMODE_CHANNEL = 1,
93
94 /* Plane programming mode for LUN */
95 NVM_PLANE_SINGLE = 0,
96 NVM_PLANE_DOUBLE = 1,
97 NVM_PLANE_QUAD = 2,
98
99 /* Status codes */
100 NVM_RSP_SUCCESS = 0x0,
101 NVM_RSP_NOT_CHANGEABLE = 0x1,
102 NVM_RSP_ERR_FAILWRITE = 0x40ff,
103 NVM_RSP_ERR_EMPTYPAGE = 0x42ff,
104
105 /* Device opcodes */
106 NVM_OP_HBREAD = 0x02,
107 NVM_OP_HBWRITE = 0x81,
108 NVM_OP_PWRITE = 0x91,
109 NVM_OP_PREAD = 0x92,
110 NVM_OP_ERASE = 0x90,
111
112 /* PPA Command Flags */
113 NVM_IO_SNGL_ACCESS = 0x0,
114 NVM_IO_DUAL_ACCESS = 0x1,
115 NVM_IO_QUAD_ACCESS = 0x2,
116
Matias Bjørling57b4bd02015-12-06 11:25:47 +0100117 /* NAND Access Modes */
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100118 NVM_IO_SUSPEND = 0x80,
119 NVM_IO_SLC_MODE = 0x100,
120 NVM_IO_SCRAMBLE_DISABLE = 0x200,
Matias Bjørling57b4bd02015-12-06 11:25:47 +0100121
122 /* Block Types */
123 NVM_BLK_T_FREE = 0x0,
124 NVM_BLK_T_BAD = 0x1,
Matias Bjørlingb5d4acd2016-01-12 07:49:32 +0100125 NVM_BLK_T_GRWN_BAD = 0x2,
126 NVM_BLK_T_DEV = 0x4,
127 NVM_BLK_T_HOST = 0x8,
Matias Bjørlingf9a99952016-01-12 07:49:34 +0100128
129 /* Memory capabilities */
130 NVM_ID_CAP_SLC = 0x1,
131 NVM_ID_CAP_CMD_SUSPEND = 0x2,
132 NVM_ID_CAP_SCRAMBLE = 0x4,
133 NVM_ID_CAP_ENCRYPT = 0x8,
Matias Bjørlingca5927e2016-01-12 07:49:35 +0100134
135 /* Memory types */
136 NVM_ID_FMTYPE_SLC = 0,
137 NVM_ID_FMTYPE_MLC = 1,
138};
139
140struct nvm_id_lp_mlc {
141 u16 num_pairs;
142 u8 pairs[886];
143};
144
145struct nvm_id_lp_tbl {
146 __u8 id[8];
147 struct nvm_id_lp_mlc mlc;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100148};
149
150struct nvm_id_group {
151 u8 mtype;
152 u8 fmtype;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100153 u8 num_ch;
154 u8 num_lun;
155 u8 num_pln;
156 u16 num_blk;
157 u16 num_pg;
158 u16 fpg_sz;
159 u16 csecs;
160 u16 sos;
161 u32 trdt;
162 u32 trdm;
163 u32 tprt;
164 u32 tprm;
165 u32 tbet;
166 u32 tbem;
167 u32 mpos;
Matias Bjørling12be5ed2015-11-16 15:34:39 +0100168 u32 mccap;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100169 u16 cpar;
Matias Bjørlingca5927e2016-01-12 07:49:35 +0100170
171 struct nvm_id_lp_tbl lptbl;
Matias Bjørling73387e72015-11-16 15:34:40 +0100172};
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100173
174struct nvm_addr_format {
175 u8 ch_offset;
176 u8 ch_len;
177 u8 lun_offset;
178 u8 lun_len;
179 u8 pln_offset;
180 u8 pln_len;
181 u8 blk_offset;
182 u8 blk_len;
183 u8 pg_offset;
184 u8 pg_len;
185 u8 sect_offset;
186 u8 sect_len;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100187};
188
189struct nvm_id {
190 u8 ver_id;
191 u8 vmnt;
192 u8 cgrps;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100193 u32 cap;
194 u32 dom;
195 struct nvm_addr_format ppaf;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100196 struct nvm_id_group groups[4];
197} __packed;
198
199struct nvm_target {
200 struct list_head list;
201 struct nvm_tgt_type *type;
202 struct gendisk *disk;
203};
204
205struct nvm_tgt_instance {
206 struct nvm_tgt_type *tt;
207};
208
209#define ADDR_EMPTY (~0ULL)
210
211#define NVM_VERSION_MAJOR 1
212#define NVM_VERSION_MINOR 0
213#define NVM_VERSION_PATCH 0
214
Matias Bjørling912761622016-01-12 07:49:21 +0100215struct nvm_rq;
Matias Bjørling72d256e2016-01-12 07:49:29 +0100216typedef void (nvm_end_io_fn)(struct nvm_rq *);
Matias Bjørling912761622016-01-12 07:49:21 +0100217
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100218struct nvm_rq {
219 struct nvm_tgt_instance *ins;
220 struct nvm_dev *dev;
221
222 struct bio *bio;
223
224 union {
225 struct ppa_addr ppa_addr;
226 dma_addr_t dma_ppa_list;
227 };
228
229 struct ppa_addr *ppa_list;
230
231 void *metadata;
232 dma_addr_t dma_metadata;
233
Matias Bjørling912761622016-01-12 07:49:21 +0100234 struct completion *wait;
235 nvm_end_io_fn *end_io;
236
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100237 uint8_t opcode;
238 uint16_t nr_pages;
239 uint16_t flags;
Matias Bjørling72d256e2016-01-12 07:49:29 +0100240
241 int error;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100242};
243
244static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
245{
246 return pdu - sizeof(struct nvm_rq);
247}
248
249static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
250{
251 return rqdata + 1;
252}
253
254struct nvm_block;
255
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100256struct nvm_lun {
257 int id;
258
259 int lun_id;
260 int chnl_id;
261
Javier Gonzálezff0e4982016-01-12 07:49:33 +0100262 /* It is up to the target to mark blocks as closed. If the target does
263 * not do it, all blocks are marked as open, and nr_open_blocks
264 * represents the number of blocks in use
265 */
266 unsigned int nr_open_blocks; /* Number of used, writable blocks */
267 unsigned int nr_closed_blocks; /* Number of used, read-only blocks */
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100268 unsigned int nr_free_blocks; /* Number of unused blocks */
Javier Gonzalez0b597332015-11-20 13:47:56 +0100269 unsigned int nr_bad_blocks; /* Number of bad blocks */
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100270
271 spinlock_t lock;
Javier Gonzálezff0e4982016-01-12 07:49:33 +0100272
273 struct nvm_block *blocks;
274};
275
276enum {
277 NVM_BLK_ST_FREE = 0x1, /* Free block */
278 NVM_BLK_ST_OPEN = 0x2, /* Open block - read-write */
279 NVM_BLK_ST_CLOSED = 0x4, /* Closed block - read-only */
280 NVM_BLK_ST_BAD = 0x8, /* Bad block */
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100281};
282
283struct nvm_block {
284 struct list_head list;
285 struct nvm_lun *lun;
286 unsigned long id;
287
288 void *priv;
Javier Gonzálezff0e4982016-01-12 07:49:33 +0100289 int state;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100290};
291
Matias Bjørlinge3eb3792016-01-12 07:49:36 +0100292/* system block cpu representation */
293struct nvm_sb_info {
294 unsigned long seqnr;
295 unsigned long erase_cnt;
296 unsigned int version;
297 char mmtype[NVM_MMTYPE_LEN];
298 struct ppa_addr fs_ppa;
299};
300
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100301struct nvm_dev {
302 struct nvm_dev_ops *ops;
303
304 struct list_head devices;
305 struct list_head online_targets;
306
307 /* Media manager */
308 struct nvmm_type *mt;
309 void *mp;
310
Matias Bjørlingb7692072016-01-12 07:49:38 +0100311 /* System blocks */
312 struct nvm_sb_info sb;
313
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100314 /* Device information */
315 int nr_chnls;
316 int nr_planes;
317 int luns_per_chnl;
318 int sec_per_pg; /* only sectors for a single page */
319 int pgs_per_blk;
320 int blks_per_lun;
321 int sec_size;
322 int oob_size;
Matias Bjørlingf9a99952016-01-12 07:49:34 +0100323 int mccap;
Matias Bjørling7386af22015-11-16 15:34:44 +0100324 struct nvm_addr_format ppaf;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100325
326 /* Calculated/Cached values. These do not reflect the actual usable
327 * blocks at run-time.
328 */
329 int max_rq_size;
330 int plane_mode; /* drive device in single, double or quad mode */
331
332 int sec_per_pl; /* all sectors across planes */
333 int sec_per_blk;
334 int sec_per_lun;
335
Matias Bjørlingca5927e2016-01-12 07:49:35 +0100336 /* lower page table */
337 int lps_per_blk;
338 int *lptbl;
339
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100340 unsigned long total_pages;
341 unsigned long total_blocks;
342 int nr_luns;
343 unsigned max_pages_per_blk;
344
345 void *ppalist_pool;
346
347 struct nvm_id identity;
348
349 /* Backend device */
350 struct request_queue *q;
351 char name[DISK_NAME_LEN];
Matias Bjørlinge3eb3792016-01-12 07:49:36 +0100352
353 struct mutex mlock;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100354};
355
Matias Bjørling7386af22015-11-16 15:34:44 +0100356static inline struct ppa_addr generic_to_dev_addr(struct nvm_dev *dev,
357 struct ppa_addr r)
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100358{
359 struct ppa_addr l;
360
Matias Bjørling7386af22015-11-16 15:34:44 +0100361 l.ppa = ((u64)r.g.blk) << dev->ppaf.blk_offset;
362 l.ppa |= ((u64)r.g.pg) << dev->ppaf.pg_offset;
363 l.ppa |= ((u64)r.g.sec) << dev->ppaf.sect_offset;
364 l.ppa |= ((u64)r.g.pl) << dev->ppaf.pln_offset;
365 l.ppa |= ((u64)r.g.lun) << dev->ppaf.lun_offset;
366 l.ppa |= ((u64)r.g.ch) << dev->ppaf.ch_offset;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100367
368 return l;
369}
370
Matias Bjørling7386af22015-11-16 15:34:44 +0100371static inline struct ppa_addr dev_to_generic_addr(struct nvm_dev *dev,
372 struct ppa_addr r)
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100373{
374 struct ppa_addr l;
375
Matias Bjørling7386af22015-11-16 15:34:44 +0100376 /*
377 * (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
378 */
379 l.g.blk = (r.ppa >> dev->ppaf.blk_offset) &
380 (((1 << dev->ppaf.blk_len) - 1));
381 l.g.pg |= (r.ppa >> dev->ppaf.pg_offset) &
382 (((1 << dev->ppaf.pg_len) - 1));
383 l.g.sec |= (r.ppa >> dev->ppaf.sect_offset) &
384 (((1 << dev->ppaf.sect_len) - 1));
385 l.g.pl |= (r.ppa >> dev->ppaf.pln_offset) &
386 (((1 << dev->ppaf.pln_len) - 1));
387 l.g.lun |= (r.ppa >> dev->ppaf.lun_offset) &
388 (((1 << dev->ppaf.lun_len) - 1));
389 l.g.ch |= (r.ppa >> dev->ppaf.ch_offset) &
390 (((1 << dev->ppaf.ch_len) - 1));
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100391
392 return l;
393}
394
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100395static inline int ppa_empty(struct ppa_addr ppa_addr)
396{
397 return (ppa_addr.ppa == ADDR_EMPTY);
398}
399
400static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
401{
402 ppa_addr->ppa = ADDR_EMPTY;
403}
404
405static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev,
406 struct nvm_block *blk)
407{
408 struct ppa_addr ppa;
409 struct nvm_lun *lun = blk->lun;
410
411 ppa.ppa = 0;
412 ppa.g.blk = blk->id % dev->blks_per_lun;
413 ppa.g.lun = lun->lun_id;
414 ppa.g.ch = lun->chnl_id;
415
416 return ppa;
417}
418
Matias Bjørlinge3eb3792016-01-12 07:49:36 +0100419static inline int ppa_to_slc(struct nvm_dev *dev, int slc_pg)
420{
421 return dev->lptbl[slc_pg];
422}
423
Jens Axboedece1632015-11-05 10:41:16 -0700424typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100425typedef sector_t (nvm_tgt_capacity_fn)(void *);
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100426typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int);
427typedef void (nvm_tgt_exit_fn)(void *);
428
429struct nvm_tgt_type {
430 const char *name;
431 unsigned int version[3];
432
433 /* target entry points */
434 nvm_tgt_make_rq_fn *make_rq;
435 nvm_tgt_capacity_fn *capacity;
Matias Bjørling912761622016-01-12 07:49:21 +0100436 nvm_end_io_fn *end_io;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100437
438 /* module-specific init/teardown */
439 nvm_tgt_init_fn *init;
440 nvm_tgt_exit_fn *exit;
441
442 /* For internal use */
443 struct list_head list;
444};
445
446extern int nvm_register_target(struct nvm_tgt_type *);
447extern void nvm_unregister_target(struct nvm_tgt_type *);
448
449extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
450extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
451
452typedef int (nvmm_register_fn)(struct nvm_dev *);
453typedef void (nvmm_unregister_fn)(struct nvm_dev *);
454typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *,
455 struct nvm_lun *, unsigned long);
456typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *);
457typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *);
458typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *);
459typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
460typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100461typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
462 unsigned long);
463typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
Javier Gonzalez2fde0e42015-11-20 13:47:57 +0100464typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100465
466struct nvmm_type {
467 const char *name;
468 unsigned int version[3];
469
470 nvmm_register_fn *register_mgr;
471 nvmm_unregister_fn *unregister_mgr;
472
473 /* Block administration callbacks */
Javier Gonzálezff0e4982016-01-12 07:49:33 +0100474 nvmm_get_blk_fn *get_blk_unlocked;
475 nvmm_put_blk_fn *put_blk_unlocked;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100476 nvmm_get_blk_fn *get_blk;
477 nvmm_put_blk_fn *put_blk;
478 nvmm_open_blk_fn *open_blk;
479 nvmm_close_blk_fn *close_blk;
480 nvmm_flush_blk_fn *flush_blk;
481
482 nvmm_submit_io_fn *submit_io;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100483 nvmm_erase_blk_fn *erase_blk;
484
485 /* Configuration management */
486 nvmm_get_lun_fn *get_lun;
487
488 /* Statistics */
Javier Gonzalez2fde0e42015-11-20 13:47:57 +0100489 nvmm_lun_info_print_fn *lun_info_print;
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100490 struct list_head list;
491};
492
493extern int nvm_register_mgr(struct nvmm_type *);
494extern void nvm_unregister_mgr(struct nvmm_type *);
495
Javier Gonzálezff0e4982016-01-12 07:49:33 +0100496extern struct nvm_block *nvm_get_blk_unlocked(struct nvm_dev *,
497 struct nvm_lun *, unsigned long);
498extern void nvm_put_blk_unlocked(struct nvm_dev *, struct nvm_block *);
499
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100500extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *,
501 unsigned long);
502extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *);
503
504extern int nvm_register(struct request_queue *, char *,
505 struct nvm_dev_ops *);
506extern void nvm_unregister(char *);
507
508extern int nvm_submit_io(struct nvm_dev *, struct nvm_rq *);
Matias Bjørling069368e2016-01-12 07:49:19 +0100509extern void nvm_generic_to_addr_mode(struct nvm_dev *, struct nvm_rq *);
510extern void nvm_addr_to_generic_mode(struct nvm_dev *, struct nvm_rq *);
Matias Bjørlingabd805e2016-01-12 07:49:20 +0100511extern int nvm_set_rqd_ppalist(struct nvm_dev *, struct nvm_rq *,
512 struct ppa_addr *, int);
513extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
Matias Bjørling81e681d2016-01-12 07:49:28 +0100514extern int nvm_erase_ppa(struct nvm_dev *, struct ppa_addr *, int);
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100515extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
Matias Bjørling912761622016-01-12 07:49:21 +0100516extern void nvm_end_io(struct nvm_rq *, int);
Matias Bjørling09719b62016-01-12 07:49:30 +0100517extern int nvm_submit_ppa(struct nvm_dev *, struct ppa_addr *, int, int, int,
518 void *, int);
Matias Bjørlinge3eb3792016-01-12 07:49:36 +0100519
520/* sysblk.c */
521#define NVM_SYSBLK_MAGIC 0x4E564D53 /* "NVMS" */
522
523/* system block on disk representation */
524struct nvm_system_block {
525 __be32 magic; /* magic signature */
526 __be32 seqnr; /* sequence number */
527 __be32 erase_cnt; /* erase count */
528 __be16 version; /* version number */
529 u8 mmtype[NVM_MMTYPE_LEN]; /* media manager name */
530 __be64 fs_ppa; /* PPA for media manager
531 * superblock */
532};
533
534extern int nvm_get_sysblock(struct nvm_dev *, struct nvm_sb_info *);
535extern int nvm_update_sysblock(struct nvm_dev *, struct nvm_sb_info *);
536extern int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *);
Matias Bjørling8b4970c2016-01-12 07:49:39 +0100537
538extern int nvm_dev_factory(struct nvm_dev *, int flags);
Matias Bjørlingcd9e9802015-10-28 19:54:55 +0100539#else /* CONFIG_NVM */
540struct nvm_dev_ops;
541
542static inline int nvm_register(struct request_queue *q, char *disk_name,
543 struct nvm_dev_ops *ops)
544{
545 return -EINVAL;
546}
547static inline void nvm_unregister(char *disk_name) {}
548#endif /* CONFIG_NVM */
549#endif /* LIGHTNVM.H */