1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2015 IT University of Copenhagen (rrpc.h)
4 * Copyright (C) 2016 CNEX Labs
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * Implementation of a Physical Block-device target for Open-channel SSDs.
24 #include <linux/blkdev.h>
25 #include <linux/blk-mq.h>
26 #include <linux/bio.h>
27 #include <linux/module.h>
28 #include <linux/kthread.h>
29 #include <linux/vmalloc.h>
30 #include <linux/crc32.h>
31 #include <linux/uuid.h>
33 #include <linux/lightnvm.h>
35 /* Run only GC if less than 1/X blocks are free */
36 #define GC_LIMIT_INVERSE 5
37 #define GC_TIME_MSECS 1000
39 #define PBLK_SECTOR (512)
40 #define PBLK_EXPOSED_PAGE_SIZE (4096)
42 #define PBLK_NR_CLOSE_JOBS (4)
44 #define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16)
46 #define PBLK_COMMAND_TIMEOUT_MS 30000
48 /* Max 512 LUNs per device */
49 #define PBLK_MAX_LUNS_BITMAP (4)
51 #define NR_PHY_IN_LOG (PBLK_EXPOSED_PAGE_SIZE / PBLK_SECTOR)
53 /* Static pool sizes */
54 #define PBLK_GEN_WS_POOL_SIZE (2)
56 #define PBLK_DEFAULT_OP (11)
60 PBLK_WRITE = WRITE,/* Write from write buffer */
61 PBLK_WRITE_INT, /* Internal write - no write buffer */
62 PBLK_READ_RECOV, /* Recovery read - errors allowed */
68 PBLK_IOTYPE_USER = 1 << 0,
69 PBLK_IOTYPE_GC = 1 << 1,
71 /* Write buffer flags */
72 PBLK_FLUSH_ENTRY = 1 << 2,
73 PBLK_WRITTEN_DATA = 1 << 3,
74 PBLK_SUBMITTED_ENTRY = 1 << 4,
75 PBLK_WRITABLE_ENTRY = 1 << 5,
79 PBLK_BLK_ST_OPEN = 0x1,
80 PBLK_BLK_ST_CLOSED = 0x2,
84 PBLK_CHUNK_RESET_START,
85 PBLK_CHUNK_RESET_DONE,
86 PBLK_CHUNK_RESET_FAILED,
89 struct pblk_sec_meta {
94 /* The number of GC lists and the rate-limiter states go together. This way the
95 * rate-limiter can dictate how much GC is needed based on resource utilization.
97 #define PBLK_GC_NR_LISTS 4
107 #define pblk_dma_ppa_size (sizeof(u64) * NVM_MAX_VLBA)
109 /* write buffer completion context */
111 struct list_head list; /* Head for out-of-order completion */
113 unsigned long *lun_bitmap; /* Luns used on current request */
115 unsigned int nr_valid;
116 unsigned int nr_padded;
122 unsigned long start_time;
126 /* partial read context */
128 struct bio *orig_bio;
129 DECLARE_BITMAP(bitmap, NVM_MAX_VLBA);
130 unsigned int orig_nr_secs;
131 unsigned int bio_init_idx;
133 dma_addr_t dma_ppa_list;
134 __le64 lba_list_mem[NVM_MAX_VLBA];
135 __le64 lba_list_media[NVM_MAX_VLBA];
141 struct completion wait;
145 /* Recovery context */
146 struct pblk_rec_ctx {
149 struct work_struct ws_rec;
154 struct bio_list bios; /* Original bios - used for completion
155 * in REQ_FUA, REQ_FLUSH case
157 u64 lba; /* Logic addr. associated with entry */
158 struct ppa_addr ppa; /* Physic addr. associated with entry */
159 int flags; /* Write context flags */
162 struct pblk_rb_entry {
163 struct ppa_addr cacheline; /* Cacheline for this entry */
164 void *data; /* Pointer to data on this entry */
165 struct pblk_w_ctx w_ctx; /* Context for this entry */
166 struct list_head index; /* List head to enable indexes */
169 #define EMPTY_ENTRY (~0U)
171 struct pblk_rb_pages {
174 struct list_head list;
178 struct pblk_rb_entry *entries; /* Ring buffer entries */
179 unsigned int mem; /* Write offset - points to next
180 * writable entry in memory
182 unsigned int subm; /* Read offset - points to last entry
183 * that has been submitted to the media
186 unsigned int sync; /* Synced - backpointer that signals
187 * the last submitted entry that has
188 * been successfully persisted to media
190 unsigned int flush_point; /* Sync point - last entry that must be
191 * flushed to the media. Used with
192 * REQ_FLUSH and REQ_FUA
194 unsigned int l2p_update; /* l2p update point - next entry for
195 * which l2p mapping will be updated to
196 * contain a device ppa address (instead
199 unsigned int nr_entries; /* Number of entries in write buffer -
200 * must be a power of two
202 unsigned int seg_size; /* Size of the data segments being
203 * stored on each entry. Typically this
207 unsigned int back_thres; /* Threshold that shall be maintained by
208 * the backpointer in order to respect
209 * geo->mw_cunits on a per chunk basis
212 struct list_head pages; /* List of data pages */
214 spinlock_t w_lock; /* Write lock */
215 spinlock_t s_lock; /* Sync lock */
217 #ifdef CONFIG_NVM_PBLK_DEBUG
218 atomic_t inflight_flush_point; /* Not served REQ_FLUSH | REQ_FUA */
222 #define PBLK_RECOVERY_SECTORS 16
225 struct ppa_addr bppa;
226 struct semaphore wr_sem;
230 struct pblk_line *line;
232 u64 paddr_list[NVM_MAX_VLBA];
233 u64 lba_list[NVM_MAX_VLBA];
236 struct list_head list;
240 /* These states are not protected by a lock since (i) they are in the
241 * fast path, and (ii) they are not critical.
247 struct task_struct *gc_ts;
248 struct task_struct *gc_writer_ts;
249 struct task_struct *gc_reader_ts;
251 struct workqueue_struct *gc_line_reader_wq;
252 struct workqueue_struct *gc_reader_wq;
254 struct timer_list gc_timer;
256 struct semaphore gc_sem;
257 atomic_t read_inflight_gc; /* Number of lines with inflight GC reads */
258 atomic_t pipeline_gc; /* Number of lines in the GC pipeline -
259 * started reads to finished writes
263 struct list_head w_list;
264 struct list_head r_list;
272 unsigned int high; /* Upper threshold for rate limiter (free run -
273 * user I/O rate limiter
275 unsigned int high_pw; /* High rounded up as a power of 2 */
277 #define PBLK_USER_HIGH_THRS 8 /* Begin write limit at 12% available blks */
278 #define PBLK_USER_LOW_THRS 10 /* Aggressive GC at 10% available blocks */
280 int rb_windows_pw; /* Number of rate windows in the write buffer
281 * given as a power-of-2. This guarantees that
282 * when user I/O is being rate limited, there
283 * will be reserved enough space for the GC to
284 * place its payload. A window is of
285 * pblk->max_write_pgs size, which in NVMe is
288 int rb_budget; /* Total number of entries available for I/O */
289 int rb_user_max; /* Max buffer entries available for user I/O */
290 int rb_gc_max; /* Max buffer entries available for GC I/O */
291 int rb_gc_rsv; /* Reserved buffer entries for GC I/O */
292 int rb_state; /* Rate-limiter current state */
293 int rb_max_io; /* Maximum size for an I/O giving the config */
295 atomic_t rb_user_cnt; /* User I/O buffer counter */
296 atomic_t rb_gc_cnt; /* GC I/O buffer counter */
297 atomic_t rb_space; /* Space limit in case of reaching capacity */
299 int rsv_blocks; /* Reserved blocks for GC */
304 atomic_t werr_lines; /* Number of write error lines that needs gc */
306 struct timer_list u_timer;
308 unsigned long long nr_secs;
309 unsigned long total_blocks;
311 atomic_t free_blocks; /* Total number of free blocks (+ OP) */
312 atomic_t free_user_blocks; /* Number of user free blocks (no OP) */
315 #define PBLK_LINE_EMPTY (~0U)
319 PBLK_LINETYPE_FREE = 0,
320 PBLK_LINETYPE_LOG = 1,
321 PBLK_LINETYPE_DATA = 2,
324 PBLK_LINESTATE_NEW = 9,
325 PBLK_LINESTATE_FREE = 10,
326 PBLK_LINESTATE_OPEN = 11,
327 PBLK_LINESTATE_CLOSED = 12,
328 PBLK_LINESTATE_GC = 13,
329 PBLK_LINESTATE_BAD = 14,
330 PBLK_LINESTATE_CORRUPT = 15,
333 PBLK_LINEGC_NONE = 20,
334 PBLK_LINEGC_EMPTY = 21,
335 PBLK_LINEGC_LOW = 22,
336 PBLK_LINEGC_MID = 23,
337 PBLK_LINEGC_HIGH = 24,
338 PBLK_LINEGC_FULL = 25,
339 PBLK_LINEGC_WERR = 26
342 #define PBLK_MAGIC 0x70626c6b /*pblk*/
344 /* emeta/smeta persistent storage format versions:
345 * Changes in major version requires offline migration.
346 * Changes in minor version are handled automatically during
350 #define SMETA_VERSION_MAJOR (0)
351 #define SMETA_VERSION_MINOR (1)
353 #define EMETA_VERSION_MAJOR (0)
354 #define EMETA_VERSION_MINOR (2)
358 __le32 identifier; /* pblk identifier */
359 __u8 uuid[16]; /* instance uuid */
360 __le16 type; /* line type */
361 __u8 version_major; /* version major */
362 __u8 version_minor; /* version minor */
363 __le32 id; /* line id for current line */
367 struct line_header header;
369 __le32 crc; /* Full structure including struct crc */
370 /* Previous line metadata */
371 __le32 prev_id; /* Line id for previous line */
373 /* Current line metadata */
374 __le64 seq_nr; /* Sequence number for current line */
377 __le32 window_wr_lun; /* Number of parallel LUNs to write */
386 * Metadata layout in media:
388 * 1. struct line_emeta
389 * 2. bad block bitmap (u64 * window_wr_lun)
390 * 3. write amplification counters
391 * Mid sectors (start at lbas_sector):
392 * 3. nr_lbas (u64) forming lba list
393 * Last sectors (start at vsc_sector):
394 * 4. u32 valid sector count (vsc) for all lines (~0U: free line)
397 struct line_header header;
399 __le32 crc; /* Full structure including struct crc */
401 /* Previous line metadata */
402 __le32 prev_id; /* Line id for prev line */
404 /* Current line metadata */
405 __le64 seq_nr; /* Sequence number for current line */
408 __le32 window_wr_lun; /* Number of parallel LUNs to write */
410 /* Bookkeeping for recovery */
411 __le32 next_id; /* Line id for next line */
412 __le64 nr_lbas; /* Number of lbas mapped in line */
413 __le64 nr_valid_lbas; /* Number of valid lbas mapped in line */
414 __le64 bb_bitmap[]; /* Updated bad block bitmap for line */
418 /* Write amplification counters stored on media */
420 __le64 user; /* Number of user written sectors */
421 __le64 gc; /* Number of sectors written by GC*/
422 __le64 pad; /* Number of padded sectors */
426 struct line_emeta *buf; /* emeta buffer in media format */
427 int mem; /* Write offset - points to next
428 * writable entry in memory
430 atomic_t sync; /* Synced - backpointer that signals the
431 * last entry that has been successfully
434 unsigned int nr_entries; /* Number of emeta entries */
438 struct line_smeta *buf; /* smeta buffer in persistent format */
441 struct pblk_w_err_gc {
448 unsigned int id; /* Line number corresponds to the
451 unsigned int seq_nr; /* Unique line sequence number */
453 int state; /* PBLK_LINESTATE_X */
454 int type; /* PBLK_LINETYPE_X */
455 int gc_group; /* PBLK_LINEGC_X */
456 struct list_head list; /* Free, GC lists */
458 unsigned long *lun_bitmap; /* Bitmap for LUNs mapped in line */
460 struct nvm_chk_meta *chks; /* Chunks forming line */
462 struct pblk_smeta *smeta; /* Start metadata */
463 struct pblk_emeta *emeta; /* End medatada */
465 int meta_line; /* Metadata line id */
466 int meta_distance; /* Distance between data and metadata */
468 u64 smeta_ssec; /* Sector where smeta starts */
469 u64 emeta_ssec; /* Sector where emeta starts */
471 unsigned int sec_in_line; /* Number of usable secs in line */
473 atomic_t blk_in_line; /* Number of good blocks in line */
474 unsigned long *blk_bitmap; /* Bitmap for valid/invalid blocks */
475 unsigned long *erase_bitmap; /* Bitmap for erased blocks */
477 unsigned long *map_bitmap; /* Bitmap for mapped sectors in line */
478 unsigned long *invalid_bitmap; /* Bitmap for invalid sectors in line */
480 atomic_t left_eblks; /* Blocks left for erasing */
481 atomic_t left_seblks; /* Blocks left for sync erasing */
483 int left_msecs; /* Sectors left for mapping */
484 unsigned int cur_sec; /* Sector map pointer */
485 unsigned int nr_valid_lbas; /* Number of valid lbas in line */
487 __le32 *vsc; /* Valid sector count in line */
489 struct kref ref; /* Write buffer L2P references */
491 struct pblk_w_err_gc *w_err_gc; /* Write error gc recovery metadata */
493 spinlock_t lock; /* Necessary for invalid_bitmap only */
496 #define PBLK_DATA_LINES 4
499 PBLK_KMALLOC_META = 1,
500 PBLK_VMALLOC_META = 2,
504 PBLK_EMETA_TYPE_HEADER = 1, /* struct line_emeta first sector */
505 PBLK_EMETA_TYPE_LLBA = 2, /* lba list - type: __le64 */
506 PBLK_EMETA_TYPE_VSC = 3, /* vsc list - type: __le32 */
509 struct pblk_line_mgmt {
510 int nr_lines; /* Total number of full lines */
511 int nr_free_lines; /* Number of full lines in free list */
513 /* Free lists - use free_lock */
514 struct list_head free_list; /* Full lines ready to use */
515 struct list_head corrupt_list; /* Full lines corrupted */
516 struct list_head bad_list; /* Full lines bad */
518 /* GC lists - use gc_lock */
519 struct list_head *gc_lists[PBLK_GC_NR_LISTS];
520 struct list_head gc_high_list; /* Full lines ready to GC, high isc */
521 struct list_head gc_mid_list; /* Full lines ready to GC, mid isc */
522 struct list_head gc_low_list; /* Full lines ready to GC, low isc */
524 struct list_head gc_werr_list; /* Write err recovery list */
526 struct list_head gc_full_list; /* Full lines ready to GC, no valid */
527 struct list_head gc_empty_list; /* Full lines close, all valid */
529 struct pblk_line *log_line; /* Current FTL log line */
530 struct pblk_line *data_line; /* Current data line */
531 struct pblk_line *log_next; /* Next FTL log line */
532 struct pblk_line *data_next; /* Next data line */
534 struct list_head emeta_list; /* Lines queued to schedule emeta */
536 __le32 *vsc_list; /* Valid sector counts for all lines */
538 /* Metadata allocation type: VMALLOC | KMALLOC */
539 int emeta_alloc_type;
541 /* Pre-allocated metadata for data lines */
542 struct pblk_smeta *sline_meta[PBLK_DATA_LINES];
543 struct pblk_emeta *eline_meta[PBLK_DATA_LINES];
544 unsigned long meta_bitmap;
546 /* Cache and mempool for map/invalid bitmaps */
547 struct kmem_cache *bitmap_cache;
548 mempool_t *bitmap_pool;
550 /* Helpers for fast bitmap calculations */
551 unsigned long *bb_template;
552 unsigned long *bb_aux;
554 unsigned long d_seq_nr; /* Data line unique sequence number */
555 unsigned long l_seq_nr; /* Log line unique sequence number */
557 spinlock_t free_lock;
558 spinlock_t close_lock;
562 struct pblk_line_meta {
563 unsigned int smeta_len; /* Total length for smeta */
564 unsigned int smeta_sec; /* Sectors needed for smeta */
566 unsigned int emeta_len[4]; /* Lengths for emeta:
568 * [1]: struct line_emeta +
569 * bb_bitmap + struct wa_counters
573 unsigned int emeta_sec[4]; /* Sectors needed for emeta. Same layout
577 unsigned int emeta_bb; /* Boundary for bb that affects emeta */
579 unsigned int vsc_list_len; /* Length for vsc list */
580 unsigned int sec_bitmap_len; /* Length for sector bitmap in line */
581 unsigned int blk_bitmap_len; /* Length for block bitmap in line */
582 unsigned int lun_bitmap_len; /* Length for lun bitmap in line */
584 unsigned int blk_per_line; /* Number of blocks in a full line */
585 unsigned int sec_per_line; /* Number of sectors in a line */
586 unsigned int dsec_per_line; /* Number of data sectors in a line */
587 unsigned int min_blk_line; /* Min. number of good blocks in line */
589 unsigned int mid_thrs; /* Threshold for GC mid list */
590 unsigned int high_thrs; /* Threshold for GC high list */
592 unsigned int meta_distance; /* Distance between data and metadata */
596 PBLK_STATE_RUNNING = 0,
597 PBLK_STATE_STOPPING = 1,
598 PBLK_STATE_RECOVERING = 2,
599 PBLK_STATE_STOPPED = 3,
602 /* Internal format to support not power-of-2 device formats */
615 struct nvm_tgt_dev *dev;
616 struct gendisk *disk;
620 struct pblk_lun *luns;
622 struct pblk_line *lines; /* Line array */
623 struct pblk_line_mgmt l_mg; /* Line management */
624 struct pblk_line_meta lm; /* Line metadata */
626 struct nvm_addrf addrf; /* Aligned address format */
627 struct pblk_addrf uaddrf; /* Unaligned address format */
632 int state; /* pblk line state */
634 int min_write_pgs; /* Minimum amount of pages required by controller */
635 int min_write_pgs_data; /* Minimum amount of payload pages */
636 int max_write_pgs; /* Maximum amount of pages supported by controller */
637 int oob_meta_size; /* Size of OOB sector metadata */
639 sector_t capacity; /* Device capacity when bad blocks are subtracted */
641 int op; /* Percentage of device used for over-provisioning */
642 int op_blks; /* Number of blocks used for over-provisioning */
644 /* pblk provisioning values. Used by rate limiter */
649 unsigned char instance_uuid[16];
651 /* Persistent write amplification counters, 4kb sector I/Os */
652 atomic64_t user_wa; /* Sectors written by user */
653 atomic64_t gc_wa; /* Sectors written by GC */
654 atomic64_t pad_wa; /* Padded sectors written */
656 /* Reset values for delta write amplification measurements */
661 /* Counters used for calculating padding distribution */
662 atomic64_t *pad_dist; /* Padding distribution buckets */
663 u64 nr_flush_rst; /* Flushes reset value for pad dist.*/
664 atomic64_t nr_flush; /* Number of flush/fua I/O */
666 #ifdef CONFIG_NVM_PBLK_DEBUG
667 /* Non-persistent debug counters, 4kb sector I/Os */
668 atomic_long_t inflight_writes; /* Inflight writes (user and gc) */
669 atomic_long_t padded_writes; /* Sectors padded due to flush/fua */
670 atomic_long_t padded_wb; /* Sectors padded in write buffer */
671 atomic_long_t req_writes; /* Sectors stored on write buffer */
672 atomic_long_t sub_writes; /* Sectors submitted from buffer */
673 atomic_long_t sync_writes; /* Sectors synced to media */
674 atomic_long_t inflight_reads; /* Inflight sector read requests */
675 atomic_long_t cache_reads; /* Read requests that hit the cache */
676 atomic_long_t sync_reads; /* Completed sector read requests */
677 atomic_long_t recov_writes; /* Sectors submitted from recovery */
678 atomic_long_t recov_gc_writes; /* Sectors submitted from write GC */
679 atomic_long_t recov_gc_reads; /* Sectors submitted from read GC */
684 atomic_long_t read_failed;
685 atomic_long_t read_empty;
686 atomic_long_t read_high_ecc;
687 atomic_long_t read_failed_gc;
688 atomic_long_t write_failed;
689 atomic_long_t erase_failed;
691 atomic_t inflight_io; /* General inflight I/O counter */
693 struct task_struct *writer_ts;
695 /* Simple translation map of logical addresses to physical addresses.
696 * The logical addresses is known by the host system, while the physical
697 * addresses are used when writing to the disk block device.
699 unsigned char *trans_map;
700 spinlock_t trans_lock;
702 struct list_head compl_list;
704 spinlock_t resubmit_lock; /* Resubmit list lock */
705 struct list_head resubmit_list; /* Resubmit list for failed writes*/
707 mempool_t page_bio_pool;
708 mempool_t gen_ws_pool;
714 struct workqueue_struct *close_wq;
715 struct workqueue_struct *bb_wq;
716 struct workqueue_struct *r_end_wq;
718 struct timer_list wtimer;
723 struct pblk_line_ws {
725 struct pblk_line *line;
727 struct work_struct ws;
730 #define pblk_g_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_g_ctx))
731 #define pblk_w_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_c_ctx))
733 #define pblk_err(pblk, fmt, ...) \
734 pr_err("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
735 #define pblk_info(pblk, fmt, ...) \
736 pr_info("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
737 #define pblk_warn(pblk, fmt, ...) \
738 pr_warn("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
739 #define pblk_debug(pblk, fmt, ...) \
740 pr_debug("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
743 * pblk ring buffer operations
745 int pblk_rb_init(struct pblk_rb *rb, unsigned int size, unsigned int threshold,
746 unsigned int seg_sz);
747 int pblk_rb_may_write_user(struct pblk_rb *rb, struct bio *bio,
748 unsigned int nr_entries, unsigned int *pos);
749 int pblk_rb_may_write_gc(struct pblk_rb *rb, unsigned int nr_entries,
751 void pblk_rb_write_entry_user(struct pblk_rb *rb, void *data,
752 struct pblk_w_ctx w_ctx, unsigned int pos);
753 void pblk_rb_write_entry_gc(struct pblk_rb *rb, void *data,
754 struct pblk_w_ctx w_ctx, struct pblk_line *line,
755 u64 paddr, unsigned int pos);
756 struct pblk_w_ctx *pblk_rb_w_ctx(struct pblk_rb *rb, unsigned int pos);
757 void pblk_rb_flush(struct pblk_rb *rb);
759 void pblk_rb_sync_l2p(struct pblk_rb *rb);
760 unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
761 unsigned int pos, unsigned int nr_entries,
763 int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
764 struct ppa_addr ppa, int bio_iter, bool advanced_bio);
765 unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int entries);
767 unsigned int pblk_rb_sync_init(struct pblk_rb *rb, unsigned long *flags);
768 unsigned int pblk_rb_sync_advance(struct pblk_rb *rb, unsigned int nr_entries);
769 unsigned int pblk_rb_ptr_wrap(struct pblk_rb *rb, unsigned int p,
770 unsigned int nr_entries);
771 void pblk_rb_sync_end(struct pblk_rb *rb, unsigned long *flags);
772 unsigned int pblk_rb_flush_point_count(struct pblk_rb *rb);
774 unsigned int pblk_rb_read_count(struct pblk_rb *rb);
775 unsigned int pblk_rb_sync_count(struct pblk_rb *rb);
776 unsigned int pblk_rb_wrap_pos(struct pblk_rb *rb, unsigned int pos);
778 int pblk_rb_tear_down_check(struct pblk_rb *rb);
779 int pblk_rb_pos_oob(struct pblk_rb *rb, u64 pos);
780 void pblk_rb_free(struct pblk_rb *rb);
781 ssize_t pblk_rb_sysfs(struct pblk_rb *rb, char *buf);
786 struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type);
787 void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type);
788 int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd);
789 void pblk_free_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd);
790 void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write);
791 int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd,
792 struct pblk_c_ctx *c_ctx);
793 void pblk_discard(struct pblk *pblk, struct bio *bio);
794 struct nvm_chk_meta *pblk_get_chunk_meta(struct pblk *pblk);
795 struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
796 struct nvm_chk_meta *lp,
797 struct ppa_addr ppa);
798 void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd);
799 void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd);
800 int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd);
801 int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd);
802 int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd);
803 int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line);
804 void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd);
805 struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
806 unsigned int nr_secs, unsigned int len,
807 int alloc_type, gfp_t gfp_mask);
808 struct pblk_line *pblk_line_get(struct pblk *pblk);
809 struct pblk_line *pblk_line_get_first_data(struct pblk *pblk);
810 struct pblk_line *pblk_line_replace_data(struct pblk *pblk);
811 void pblk_ppa_to_line_put(struct pblk *pblk, struct ppa_addr ppa);
812 void pblk_rq_to_line_put(struct pblk *pblk, struct nvm_rq *rqd);
813 int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line);
814 void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line);
815 struct pblk_line *pblk_line_get_data(struct pblk *pblk);
816 struct pblk_line *pblk_line_get_erase(struct pblk *pblk);
817 int pblk_line_erase(struct pblk *pblk, struct pblk_line *line);
818 int pblk_line_is_full(struct pblk_line *line);
819 void pblk_line_free(struct pblk_line *line);
820 void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line);
821 void pblk_line_close(struct pblk *pblk, struct pblk_line *line);
822 void pblk_line_close_ws(struct work_struct *work);
823 void pblk_pipeline_stop(struct pblk *pblk);
824 void __pblk_pipeline_stop(struct pblk *pblk);
825 void __pblk_pipeline_flush(struct pblk *pblk);
826 void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
827 void (*work)(struct work_struct *), gfp_t gfp_mask,
828 struct workqueue_struct *wq);
829 u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line);
830 int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line);
831 int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
833 int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr erase_ppa);
834 void pblk_line_put(struct kref *ref);
835 void pblk_line_put_wq(struct kref *ref);
836 struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line);
837 u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line);
838 void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
839 u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
840 u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
841 int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
842 unsigned long secs_to_flush, bool skip_meta);
843 void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa,
844 unsigned long *lun_bitmap);
845 void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa);
846 void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa);
847 void pblk_up_rq(struct pblk *pblk, unsigned long *lun_bitmap);
848 int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
850 void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
852 void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa);
853 void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
855 void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa);
856 void pblk_update_map_cache(struct pblk *pblk, sector_t lba,
857 struct ppa_addr ppa);
858 void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
859 struct ppa_addr ppa, struct ppa_addr entry_line);
860 int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa,
861 struct pblk_line *gc_line, u64 paddr);
862 void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
863 u64 *lba_list, int nr_secs);
864 void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
865 sector_t blba, int nr_secs);
866 void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd);
867 void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd);
870 * pblk user I/O write path
872 int pblk_write_to_cache(struct pblk *pblk, struct bio *bio,
873 unsigned long flags);
874 int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq);
879 int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,
880 unsigned int sentry, unsigned long *lun_bitmap,
881 unsigned int valid_secs, struct ppa_addr *erase_ppa);
882 int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,
883 unsigned long *lun_bitmap, unsigned int valid_secs,
889 int pblk_write_ts(void *data);
890 void pblk_write_timer_fn(struct timer_list *t);
891 void pblk_write_should_kick(struct pblk *pblk);
892 void pblk_write_kick(struct pblk *pblk);
897 extern struct bio_set pblk_bio_set;
898 int pblk_submit_read(struct pblk *pblk, struct bio *bio);
899 int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq);
903 struct pblk_line *pblk_recov_l2p(struct pblk *pblk);
904 int pblk_recov_pad(struct pblk *pblk);
905 int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta);
910 #define PBLK_GC_MAX_READERS 8 /* Max number of outstanding GC reader jobs */
911 #define PBLK_GC_RQ_QD 128 /* Queue depth for inflight GC requests */
912 #define PBLK_GC_L_QD 4 /* Queue depth for inflight GC lines */
914 int pblk_gc_init(struct pblk *pblk);
915 void pblk_gc_exit(struct pblk *pblk, bool graceful);
916 void pblk_gc_should_start(struct pblk *pblk);
917 void pblk_gc_should_stop(struct pblk *pblk);
918 void pblk_gc_should_kick(struct pblk *pblk);
919 void pblk_gc_free_full_lines(struct pblk *pblk);
920 void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled,
922 int pblk_gc_sysfs_force(struct pblk *pblk, int force);
927 void pblk_rl_init(struct pblk_rl *rl, int budget);
928 void pblk_rl_free(struct pblk_rl *rl);
929 void pblk_rl_update_rates(struct pblk_rl *rl);
930 int pblk_rl_high_thrs(struct pblk_rl *rl);
931 unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl);
932 unsigned long pblk_rl_nr_user_free_blks(struct pblk_rl *rl);
933 int pblk_rl_user_may_insert(struct pblk_rl *rl, int nr_entries);
934 void pblk_rl_inserted(struct pblk_rl *rl, int nr_entries);
935 void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries);
936 int pblk_rl_gc_may_insert(struct pblk_rl *rl, int nr_entries);
937 void pblk_rl_gc_in(struct pblk_rl *rl, int nr_entries);
938 void pblk_rl_out(struct pblk_rl *rl, int nr_user, int nr_gc);
939 int pblk_rl_max_io(struct pblk_rl *rl);
940 void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line);
941 void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line,
943 int pblk_rl_is_limit(struct pblk_rl *rl);
945 void pblk_rl_werr_line_in(struct pblk_rl *rl);
946 void pblk_rl_werr_line_out(struct pblk_rl *rl);
951 int pblk_sysfs_init(struct gendisk *tdisk);
952 void pblk_sysfs_exit(struct gendisk *tdisk);
954 static inline void *pblk_malloc(size_t size, int type, gfp_t flags)
956 if (type == PBLK_KMALLOC_META)
957 return kmalloc(size, flags);
958 return vmalloc(size);
961 static inline void pblk_mfree(void *ptr, int type)
963 if (type == PBLK_KMALLOC_META)
969 static inline struct nvm_rq *nvm_rq_from_c_ctx(void *c_ctx)
971 return c_ctx - sizeof(struct nvm_rq);
974 static inline void *emeta_to_bb(struct line_emeta *emeta)
976 return emeta->bb_bitmap;
979 static inline void *emeta_to_wa(struct pblk_line_meta *lm,
980 struct line_emeta *emeta)
982 return emeta->bb_bitmap + lm->blk_bitmap_len;
985 static inline void *emeta_to_lbas(struct pblk *pblk, struct line_emeta *emeta)
987 return ((void *)emeta + pblk->lm.emeta_len[1]);
990 static inline void *emeta_to_vsc(struct pblk *pblk, struct line_emeta *emeta)
992 return (emeta_to_lbas(pblk, emeta) + pblk->lm.emeta_len[2]);
995 static inline int pblk_line_vsc(struct pblk_line *line)
997 return le32_to_cpu(*line->vsc);
1000 static inline int pblk_ppa_to_line_id(struct ppa_addr p)
1005 static inline struct pblk_line *pblk_ppa_to_line(struct pblk *pblk,
1008 return &pblk->lines[pblk_ppa_to_line_id(p)];
1011 static inline int pblk_ppa_to_pos(struct nvm_geo *geo, struct ppa_addr p)
1013 return p.a.lun * geo->num_ch + p.a.ch;
1016 static inline struct ppa_addr addr_to_gen_ppa(struct pblk *pblk, u64 paddr,
1019 struct nvm_tgt_dev *dev = pblk->dev;
1020 struct nvm_geo *geo = &dev->geo;
1021 struct ppa_addr ppa;
1023 if (geo->version == NVM_OCSSD_SPEC_12) {
1024 struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&pblk->addrf;
1027 ppa.g.blk = line_id;
1028 ppa.g.pg = (paddr & ppaf->pg_mask) >> ppaf->pg_offset;
1029 ppa.g.lun = (paddr & ppaf->lun_mask) >> ppaf->lun_offset;
1030 ppa.g.ch = (paddr & ppaf->ch_mask) >> ppaf->ch_offset;
1031 ppa.g.pl = (paddr & ppaf->pln_mask) >> ppaf->pln_offset;
1032 ppa.g.sec = (paddr & ppaf->sec_mask) >> ppaf->sec_offset;
1034 struct pblk_addrf *uaddrf = &pblk->uaddrf;
1035 int secs, chnls, luns;
1039 ppa.m.chk = line_id;
1041 paddr = div_u64_rem(paddr, uaddrf->sec_stripe, &secs);
1044 paddr = div_u64_rem(paddr, uaddrf->ch_stripe, &chnls);
1047 paddr = div_u64_rem(paddr, uaddrf->lun_stripe, &luns);
1050 ppa.m.sec += uaddrf->sec_stripe * paddr;
1056 static inline struct nvm_chk_meta *pblk_dev_ppa_to_chunk(struct pblk *pblk,
1059 struct nvm_tgt_dev *dev = pblk->dev;
1060 struct nvm_geo *geo = &dev->geo;
1061 struct pblk_line *line = pblk_ppa_to_line(pblk, p);
1062 int pos = pblk_ppa_to_pos(geo, p);
1064 return &line->chks[pos];
1067 static inline u64 pblk_dev_ppa_to_chunk_addr(struct pblk *pblk,
1070 struct nvm_tgt_dev *dev = pblk->dev;
1072 return dev_to_chunk_addr(dev->parent, &pblk->addrf, p);
1075 static inline u64 pblk_dev_ppa_to_line_addr(struct pblk *pblk,
1078 struct nvm_tgt_dev *dev = pblk->dev;
1079 struct nvm_geo *geo = &dev->geo;
1082 if (geo->version == NVM_OCSSD_SPEC_12) {
1083 struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&pblk->addrf;
1085 paddr = (u64)p.g.ch << ppaf->ch_offset;
1086 paddr |= (u64)p.g.lun << ppaf->lun_offset;
1087 paddr |= (u64)p.g.pg << ppaf->pg_offset;
1088 paddr |= (u64)p.g.pl << ppaf->pln_offset;
1089 paddr |= (u64)p.g.sec << ppaf->sec_offset;
1091 struct pblk_addrf *uaddrf = &pblk->uaddrf;
1095 paddr = (u64)p.m.grp * uaddrf->sec_stripe;
1096 paddr += (u64)p.m.pu * uaddrf->sec_lun_stripe;
1098 secs = div_u64_rem(secs, uaddrf->sec_stripe, &sec_stripe);
1099 paddr += secs * uaddrf->sec_ws_stripe;
1100 paddr += sec_stripe;
1106 static inline struct ppa_addr pblk_ppa32_to_ppa64(struct pblk *pblk, u32 ppa32)
1108 struct nvm_tgt_dev *dev = pblk->dev;
1110 return nvm_ppa32_to_ppa64(dev->parent, &pblk->addrf, ppa32);
1113 static inline u32 pblk_ppa64_to_ppa32(struct pblk *pblk, struct ppa_addr ppa64)
1115 struct nvm_tgt_dev *dev = pblk->dev;
1117 return nvm_ppa64_to_ppa32(dev->parent, &pblk->addrf, ppa64);
1120 static inline struct ppa_addr pblk_trans_map_get(struct pblk *pblk,
1123 struct ppa_addr ppa;
1125 if (pblk->addrf_len < 32) {
1126 u32 *map = (u32 *)pblk->trans_map;
1128 ppa = pblk_ppa32_to_ppa64(pblk, map[lba]);
1130 struct ppa_addr *map = (struct ppa_addr *)pblk->trans_map;
1138 static inline void pblk_trans_map_set(struct pblk *pblk, sector_t lba,
1139 struct ppa_addr ppa)
1141 if (pblk->addrf_len < 32) {
1142 u32 *map = (u32 *)pblk->trans_map;
1144 map[lba] = pblk_ppa64_to_ppa32(pblk, ppa);
1146 u64 *map = (u64 *)pblk->trans_map;
1152 static inline int pblk_ppa_empty(struct ppa_addr ppa_addr)
1154 return (ppa_addr.ppa == ADDR_EMPTY);
1157 static inline void pblk_ppa_set_empty(struct ppa_addr *ppa_addr)
1159 ppa_addr->ppa = ADDR_EMPTY;
1162 static inline bool pblk_ppa_comp(struct ppa_addr lppa, struct ppa_addr rppa)
1164 return (lppa.ppa == rppa.ppa);
1167 static inline int pblk_addr_in_cache(struct ppa_addr ppa)
1169 return (ppa.ppa != ADDR_EMPTY && ppa.c.is_cached);
1172 static inline int pblk_addr_to_cacheline(struct ppa_addr ppa)
1177 static inline struct ppa_addr pblk_cacheline_to_addr(int addr)
1187 static inline u32 pblk_calc_meta_header_crc(struct pblk *pblk,
1188 struct line_header *header)
1192 crc = crc32_le(crc, (unsigned char *)header + sizeof(crc),
1193 sizeof(struct line_header) - sizeof(crc));
1198 static inline u32 pblk_calc_smeta_crc(struct pblk *pblk,
1199 struct line_smeta *smeta)
1201 struct pblk_line_meta *lm = &pblk->lm;
1204 crc = crc32_le(crc, (unsigned char *)smeta +
1205 sizeof(struct line_header) + sizeof(crc),
1207 sizeof(struct line_header) - sizeof(crc));
1212 static inline u32 pblk_calc_emeta_crc(struct pblk *pblk,
1213 struct line_emeta *emeta)
1215 struct pblk_line_meta *lm = &pblk->lm;
1218 crc = crc32_le(crc, (unsigned char *)emeta +
1219 sizeof(struct line_header) + sizeof(crc),
1221 sizeof(struct line_header) - sizeof(crc));
1226 static inline int pblk_io_aligned(struct pblk *pblk, int nr_secs)
1228 return !(nr_secs % pblk->min_write_pgs);
1231 #ifdef CONFIG_NVM_PBLK_DEBUG
1232 static inline void print_ppa(struct pblk *pblk, struct ppa_addr *p,
1233 char *msg, int error)
1235 struct nvm_geo *geo = &pblk->dev->geo;
1237 if (p->c.is_cached) {
1238 pblk_err(pblk, "ppa: (%s: %x) cache line: %llu\n",
1239 msg, error, (u64)p->c.line);
1240 } else if (geo->version == NVM_OCSSD_SPEC_12) {
1241 pblk_err(pblk, "ppa: (%s: %x):ch:%d,lun:%d,blk:%d,pg:%d,pl:%d,sec:%d\n",
1243 p->g.ch, p->g.lun, p->g.blk,
1244 p->g.pg, p->g.pl, p->g.sec);
1246 pblk_err(pblk, "ppa: (%s: %x):ch:%d,lun:%d,chk:%d,sec:%d\n",
1248 p->m.grp, p->m.pu, p->m.chk, p->m.sec);
1252 static inline void pblk_print_failed_rqd(struct pblk *pblk, struct nvm_rq *rqd,
1257 if (rqd->nr_ppas == 1) {
1258 print_ppa(pblk, &rqd->ppa_addr, "rqd", error);
1262 while ((bit = find_next_bit((void *)&rqd->ppa_status, rqd->nr_ppas,
1263 bit + 1)) < rqd->nr_ppas) {
1264 print_ppa(pblk, &rqd->ppa_list[bit], "rqd", error);
1267 pblk_err(pblk, "error:%d, ppa_status:%llx\n", error, rqd->ppa_status);
1270 static inline int pblk_boundary_ppa_checks(struct nvm_tgt_dev *tgt_dev,
1271 struct ppa_addr *ppas, int nr_ppas)
1273 struct nvm_geo *geo = &tgt_dev->geo;
1274 struct ppa_addr *ppa;
1277 for (i = 0; i < nr_ppas; i++) {
1280 if (geo->version == NVM_OCSSD_SPEC_12) {
1281 if (!ppa->c.is_cached &&
1282 ppa->g.ch < geo->num_ch &&
1283 ppa->g.lun < geo->num_lun &&
1284 ppa->g.pl < geo->num_pln &&
1285 ppa->g.blk < geo->num_chk &&
1286 ppa->g.pg < geo->num_pg &&
1287 ppa->g.sec < geo->ws_min)
1290 if (!ppa->c.is_cached &&
1291 ppa->m.grp < geo->num_ch &&
1292 ppa->m.pu < geo->num_lun &&
1293 ppa->m.chk < geo->num_chk &&
1294 ppa->m.sec < geo->clba)
1298 print_ppa(tgt_dev->q->queuedata, ppa, "boundary", i);
1305 static inline int pblk_check_io(struct pblk *pblk, struct nvm_rq *rqd)
1307 struct nvm_tgt_dev *dev = pblk->dev;
1308 struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
1310 if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) {
1315 if (rqd->opcode == NVM_OP_PWRITE) {
1316 struct pblk_line *line;
1319 for (i = 0; i < rqd->nr_ppas; i++) {
1320 line = pblk_ppa_to_line(pblk, ppa_list[i]);
1322 spin_lock(&line->lock);
1323 if (line->state != PBLK_LINESTATE_OPEN) {
1324 pblk_err(pblk, "bad ppa: line:%d,state:%d\n",
1325 line->id, line->state);
1327 spin_unlock(&line->lock);
1330 spin_unlock(&line->lock);
1338 static inline int pblk_boundary_paddr_checks(struct pblk *pblk, u64 paddr)
1340 struct pblk_line_meta *lm = &pblk->lm;
1342 if (paddr > lm->sec_per_line)
1348 static inline unsigned int pblk_get_bi_idx(struct bio *bio)
1350 return bio->bi_iter.bi_idx;
1353 static inline sector_t pblk_get_lba(struct bio *bio)
1355 return bio->bi_iter.bi_sector / NR_PHY_IN_LOG;
1358 static inline unsigned int pblk_get_secs(struct bio *bio)
1360 return bio->bi_iter.bi_size / PBLK_EXPOSED_PAGE_SIZE;
1363 static inline void pblk_setup_uuid(struct pblk *pblk)
1368 memcpy(pblk->instance_uuid, uuid.b, 16);
1371 static inline char *pblk_disk_name(struct pblk *pblk)
1373 struct gendisk *disk = pblk->disk;
1375 return disk->disk_name;
1378 static inline unsigned int pblk_get_min_chks(struct pblk *pblk)
1380 struct pblk_line_meta *lm = &pblk->lm;
1381 /* In a worst-case scenario every line will have OP invalid sectors.
1382 * We will then need a minimum of 1/OP lines to free up a single line
1385 return DIV_ROUND_UP(100, pblk->op) * lm->blk_per_line;
1388 static inline struct pblk_sec_meta *pblk_get_meta(struct pblk *pblk,
1389 void *meta, int index)
1392 max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size)
1396 static inline int pblk_dma_meta_size(struct pblk *pblk)
1398 return max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size)
1402 static inline int pblk_is_oob_meta_supported(struct pblk *pblk)
1404 return pblk->oob_meta_size >= sizeof(struct pblk_sec_meta);
1406 #endif /* PBLK_H_ */