| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Javier González | 5369 | 89.32% | 51 | 57.30% |
| Hans Holmberg | 337 | 5.61% | 18 | 20.22% |
| Igor Konopko | 158 | 2.63% | 7 | 7.87% |
| Matias Björling | 130 | 2.16% | 7 | 7.87% |
| Neil Brown | 5 | 0.08% | 1 | 1.12% |
| Heiner Litz | 4 | 0.07% | 1 | 1.12% |
| Kees Cook | 4 | 0.07% | 1 | 1.12% |
| Rakesh Pandit | 2 | 0.03% | 1 | 1.12% |
| Andy Shevchenko | 1 | 0.02% | 1 | 1.12% |
| Arnd Bergmann | 1 | 0.02% | 1 | 1.12% |
| Total | 6011 | 89 |
/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2015 IT University of Copenhagen (rrpc.h) * Copyright (C) 2016 CNEX Labs * Initial release: Matias Bjorling <matias@cnexlabs.com> * Write buffering: Javier Gonzalez <javier@cnexlabs.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * Implementation of a Physical Block-device target for Open-channel SSDs. * */ #ifndef PBLK_H_ #define PBLK_H_ #include <linux/blkdev.h> #include <linux/blk-mq.h> #include <linux/bio.h> #include <linux/module.h> #include <linux/kthread.h> #include <linux/vmalloc.h> #include <linux/crc32.h> #include <linux/uuid.h> #include <linux/lightnvm.h> /* Run only GC if less than 1/X blocks are free */ #define GC_LIMIT_INVERSE 5 #define GC_TIME_MSECS 1000 #define PBLK_SECTOR (512) #define PBLK_EXPOSED_PAGE_SIZE (4096) #define PBLK_NR_CLOSE_JOBS (4) #define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16) /* Max 512 LUNs per device */ #define PBLK_MAX_LUNS_BITMAP (4) #define NR_PHY_IN_LOG (PBLK_EXPOSED_PAGE_SIZE / PBLK_SECTOR) /* Static pool sizes */ #define PBLK_GEN_WS_POOL_SIZE (2) #define PBLK_DEFAULT_OP (11) enum { PBLK_READ = READ, PBLK_WRITE = WRITE,/* Write from write buffer */ PBLK_WRITE_INT, /* Internal write - no write buffer */ PBLK_READ_RECOV, /* Recovery read - errors allowed */ PBLK_ERASE, }; enum { /* IO Types */ PBLK_IOTYPE_USER = 1 << 0, PBLK_IOTYPE_GC = 1 << 1, /* Write buffer flags */ PBLK_FLUSH_ENTRY = 1 << 2, PBLK_WRITTEN_DATA = 1 << 3, PBLK_SUBMITTED_ENTRY = 1 << 4, PBLK_WRITABLE_ENTRY = 1 << 5, }; enum { PBLK_BLK_ST_OPEN = 0x1, PBLK_BLK_ST_CLOSED = 0x2, }; enum { PBLK_CHUNK_RESET_START, PBLK_CHUNK_RESET_DONE, PBLK_CHUNK_RESET_FAILED, }; struct pblk_sec_meta { u64 reserved; __le64 lba; }; /* The number of GC lists and the rate-limiter states go together. This way the * rate-limiter can dictate how much GC is needed based on resource utilization. */ #define PBLK_GC_NR_LISTS 4 enum { PBLK_RL_OFF = 0, PBLK_RL_WERR = 1, PBLK_RL_HIGH = 2, PBLK_RL_MID = 3, PBLK_RL_LOW = 4 }; #define pblk_dma_ppa_size (sizeof(u64) * NVM_MAX_VLBA) /* write buffer completion context */ struct pblk_c_ctx { struct list_head list; /* Head for out-of-order completion */ unsigned long *lun_bitmap; /* Luns used on current request */ unsigned int sentry; unsigned int nr_valid; unsigned int nr_padded; }; /* read context */ struct pblk_g_ctx { void *private; unsigned long start_time; u64 lba; }; /* Pad context */ struct pblk_pad_rq { struct pblk *pblk; struct completion wait; struct kref ref; }; /* Recovery context */ struct pblk_rec_ctx { struct pblk *pblk; struct nvm_rq *rqd; struct work_struct ws_rec; }; /* Write context */ struct pblk_w_ctx { struct bio_list bios; /* Original bios - used for completion * in REQ_FUA, REQ_FLUSH case */ u64 lba; /* Logic addr. associated with entry */ struct ppa_addr ppa; /* Physic addr. associated with entry */ int flags; /* Write context flags */ }; struct pblk_rb_entry { struct ppa_addr cacheline; /* Cacheline for this entry */ void *data; /* Pointer to data on this entry */ struct pblk_w_ctx w_ctx; /* Context for this entry */ struct list_head index; /* List head to enable indexes */ }; #define EMPTY_ENTRY (~0U) struct pblk_rb_pages { struct page *pages; int order; struct list_head list; }; struct pblk_rb { struct pblk_rb_entry *entries; /* Ring buffer entries */ unsigned int mem; /* Write offset - points to next * writable entry in memory */ unsigned int subm; /* Read offset - points to last entry * that has been submitted to the media * to be persisted */ unsigned int sync; /* Synced - backpointer that signals * the last submitted entry that has * been successfully persisted to media */ unsigned int flush_point; /* Sync point - last entry that must be * flushed to the media. Used with * REQ_FLUSH and REQ_FUA */ unsigned int l2p_update; /* l2p update point - next entry for * which l2p mapping will be updated to * contain a device ppa address (instead * of a cacheline */ unsigned int nr_entries; /* Number of entries in write buffer - * must be a power of two */ unsigned int seg_size; /* Size of the data segments being * stored on each entry. Typically this * will be 4KB */ unsigned int back_thres; /* Threshold that shall be maintained by * the backpointer in order to respect * geo->mw_cunits on a per chunk basis */ struct list_head pages; /* List of data pages */ spinlock_t w_lock; /* Write lock */ spinlock_t s_lock; /* Sync lock */ #ifdef CONFIG_NVM_PBLK_DEBUG atomic_t inflight_flush_point; /* Not served REQ_FLUSH | REQ_FUA */ #endif }; #define PBLK_RECOVERY_SECTORS 16 struct pblk_lun { struct ppa_addr bppa; struct semaphore wr_sem; }; struct pblk_gc_rq { struct pblk_line *line; void *data; u64 paddr_list[NVM_MAX_VLBA]; u64 lba_list[NVM_MAX_VLBA]; int nr_secs; int secs_to_gc; struct list_head list; }; struct pblk_gc { /* These states are not protected by a lock since (i) they are in the * fast path, and (ii) they are not critical. */ int gc_active; int gc_enabled; int gc_forced; struct task_struct *gc_ts; struct task_struct *gc_writer_ts; struct task_struct *gc_reader_ts; struct workqueue_struct *gc_line_reader_wq; struct workqueue_struct *gc_reader_wq; struct timer_list gc_timer; struct semaphore gc_sem; atomic_t read_inflight_gc; /* Number of lines with inflight GC reads */ atomic_t pipeline_gc; /* Number of lines in the GC pipeline - * started reads to finished writes */ int w_entries; struct list_head w_list; struct list_head r_list; spinlock_t lock; spinlock_t w_lock; spinlock_t r_lock; }; struct pblk_rl { unsigned int high; /* Upper threshold for rate limiter (free run - * user I/O rate limiter */ unsigned int high_pw; /* High rounded up as a power of 2 */ #define PBLK_USER_HIGH_THRS 8 /* Begin write limit at 12% available blks */ #define PBLK_USER_LOW_THRS 10 /* Aggressive GC at 10% available blocks */ int rb_windows_pw; /* Number of rate windows in the write buffer * given as a power-of-2. This guarantees that * when user I/O is being rate limited, there * will be reserved enough space for the GC to * place its payload. A window is of * pblk->max_write_pgs size, which in NVMe is * 64, i.e., 256kb. */ int rb_budget; /* Total number of entries available for I/O */ int rb_user_max; /* Max buffer entries available for user I/O */ int rb_gc_max; /* Max buffer entries available for GC I/O */ int rb_gc_rsv; /* Reserved buffer entries for GC I/O */ int rb_state; /* Rate-limiter current state */ int rb_max_io; /* Maximum size for an I/O giving the config */ atomic_t rb_user_cnt; /* User I/O buffer counter */ atomic_t rb_gc_cnt; /* GC I/O buffer counter */ atomic_t rb_space; /* Space limit in case of reaching capacity */ int rsv_blocks; /* Reserved blocks for GC */ int rb_user_active; int rb_gc_active; atomic_t werr_lines; /* Number of write error lines that needs gc */ struct timer_list u_timer; unsigned long total_blocks; atomic_t free_blocks; /* Total number of free blocks (+ OP) */ atomic_t free_user_blocks; /* Number of user free blocks (no OP) */ }; #define PBLK_LINE_EMPTY (~0U) enum { /* Line Types */ PBLK_LINETYPE_FREE = 0, PBLK_LINETYPE_LOG = 1, PBLK_LINETYPE_DATA = 2, /* Line state */ PBLK_LINESTATE_NEW = 9, PBLK_LINESTATE_FREE = 10, PBLK_LINESTATE_OPEN = 11, PBLK_LINESTATE_CLOSED = 12, PBLK_LINESTATE_GC = 13, PBLK_LINESTATE_BAD = 14, PBLK_LINESTATE_CORRUPT = 15, /* GC group */ PBLK_LINEGC_NONE = 20, PBLK_LINEGC_EMPTY = 21, PBLK_LINEGC_LOW = 22, PBLK_LINEGC_MID = 23, PBLK_LINEGC_HIGH = 24, PBLK_LINEGC_FULL = 25, PBLK_LINEGC_WERR = 26 }; #define PBLK_MAGIC 0x70626c6b /*pblk*/ /* emeta/smeta persistent storage format versions: * Changes in major version requires offline migration. * Changes in minor version are handled automatically during * recovery. */ #define SMETA_VERSION_MAJOR (0) #define SMETA_VERSION_MINOR (1) #define EMETA_VERSION_MAJOR (0) #define EMETA_VERSION_MINOR (2) struct line_header { __le32 crc; __le32 identifier; /* pblk identifier */ __u8 uuid[16]; /* instance uuid */ __le16 type; /* line type */ __u8 version_major; /* version major */ __u8 version_minor; /* version minor */ __le32 id; /* line id for current line */ }; struct line_smeta { struct line_header header; __le32 crc; /* Full structure including struct crc */ /* Previous line metadata */ __le32 prev_id; /* Line id for previous line */ /* Current line metadata */ __le64 seq_nr; /* Sequence number for current line */ /* Active writers */ __le32 window_wr_lun; /* Number of parallel LUNs to write */ __le32 rsvd[2]; __le64 lun_bitmap[]; }; /* * Metadata layout in media: * First sector: * 1. struct line_emeta * 2. bad block bitmap (u64 * window_wr_lun) * 3. write amplification counters * Mid sectors (start at lbas_sector): * 3. nr_lbas (u64) forming lba list * Last sectors (start at vsc_sector): * 4. u32 valid sector count (vsc) for all lines (~0U: free line) */ struct line_emeta { struct line_header header; __le32 crc; /* Full structure including struct crc */ /* Previous line metadata */ __le32 prev_id; /* Line id for prev line */ /* Current line metadata */ __le64 seq_nr; /* Sequence number for current line */ /* Active writers */ __le32 window_wr_lun; /* Number of parallel LUNs to write */ /* Bookkeeping for recovery */ __le32 next_id; /* Line id for next line */ __le64 nr_lbas; /* Number of lbas mapped in line */ __le64 nr_valid_lbas; /* Number of valid lbas mapped in line */ __le64 bb_bitmap[]; /* Updated bad block bitmap for line */ }; /* Write amplification counters stored on media */ struct wa_counters { __le64 user; /* Number of user written sectors */ __le64 gc; /* Number of sectors written by GC*/ __le64 pad; /* Number of padded sectors */ }; struct pblk_emeta { struct line_emeta *buf; /* emeta buffer in media format */ int mem; /* Write offset - points to next * writable entry in memory */ atomic_t sync; /* Synced - backpointer that signals the * last entry that has been successfully * persisted to media */ unsigned int nr_entries; /* Number of emeta entries */ }; struct pblk_smeta { struct line_smeta *buf; /* smeta buffer in persistent format */ }; struct pblk_w_err_gc { int has_write_err; int has_gc_err; __le64 *lba_list; }; struct pblk_line { struct pblk *pblk; unsigned int id; /* Line number corresponds to the * block line */ unsigned int seq_nr; /* Unique line sequence number */ int state; /* PBLK_LINESTATE_X */ int type; /* PBLK_LINETYPE_X */ int gc_group; /* PBLK_LINEGC_X */ struct list_head list; /* Free, GC lists */ unsigned long *lun_bitmap; /* Bitmap for LUNs mapped in line */ struct nvm_chk_meta *chks; /* Chunks forming line */ struct pblk_smeta *smeta; /* Start metadata */ struct pblk_emeta *emeta; /* End medatada */ int meta_line; /* Metadata line id */ int meta_distance; /* Distance between data and metadata */ u64 emeta_ssec; /* Sector where emeta starts */ unsigned int sec_in_line; /* Number of usable secs in line */ atomic_t blk_in_line; /* Number of good blocks in line */ unsigned long *blk_bitmap; /* Bitmap for valid/invalid blocks */ unsigned long *erase_bitmap; /* Bitmap for erased blocks */ unsigned long *map_bitmap; /* Bitmap for mapped sectors in line */ unsigned long *invalid_bitmap; /* Bitmap for invalid sectors in line */ atomic_t left_eblks; /* Blocks left for erasing */ atomic_t left_seblks; /* Blocks left for sync erasing */ int left_msecs; /* Sectors left for mapping */ unsigned int cur_sec; /* Sector map pointer */ unsigned int nr_valid_lbas; /* Number of valid lbas in line */ __le32 *vsc; /* Valid sector count in line */ struct kref ref; /* Write buffer L2P references */ atomic_t sec_to_update; /* Outstanding L2P updates to ppa */ struct pblk_w_err_gc *w_err_gc; /* Write error gc recovery metadata */ spinlock_t lock; /* Necessary for invalid_bitmap only */ }; #define PBLK_DATA_LINES 4 enum { PBLK_EMETA_TYPE_HEADER = 1, /* struct line_emeta first sector */ PBLK_EMETA_TYPE_LLBA = 2, /* lba list - type: __le64 */ PBLK_EMETA_TYPE_VSC = 3, /* vsc list - type: __le32 */ }; struct pblk_line_mgmt { int nr_lines; /* Total number of full lines */ int nr_free_lines; /* Number of full lines in free list */ /* Free lists - use free_lock */ struct list_head free_list; /* Full lines ready to use */ struct list_head corrupt_list; /* Full lines corrupted */ struct list_head bad_list; /* Full lines bad */ /* GC lists - use gc_lock */ struct list_head *gc_lists[PBLK_GC_NR_LISTS]; struct list_head gc_high_list; /* Full lines ready to GC, high isc */ struct list_head gc_mid_list; /* Full lines ready to GC, mid isc */ struct list_head gc_low_list; /* Full lines ready to GC, low isc */ struct list_head gc_werr_list; /* Write err recovery list */ struct list_head gc_full_list; /* Full lines ready to GC, no valid */ struct list_head gc_empty_list; /* Full lines close, all valid */ struct pblk_line *log_line; /* Current FTL log line */ struct pblk_line *data_line; /* Current data line */ struct pblk_line *log_next; /* Next FTL log line */ struct pblk_line *data_next; /* Next data line */ struct list_head emeta_list; /* Lines queued to schedule emeta */ __le32 *vsc_list; /* Valid sector counts for all lines */ /* Pre-allocated metadata for data lines */ struct pblk_smeta *sline_meta[PBLK_DATA_LINES]; struct pblk_emeta *eline_meta[PBLK_DATA_LINES]; unsigned long meta_bitmap; /* Cache and mempool for map/invalid bitmaps */ struct kmem_cache *bitmap_cache; mempool_t *bitmap_pool; /* Helpers for fast bitmap calculations */ unsigned long *bb_template; unsigned long *bb_aux; unsigned long d_seq_nr; /* Data line unique sequence number */ unsigned long l_seq_nr; /* Log line unique sequence number */ spinlock_t free_lock; spinlock_t close_lock; spinlock_t gc_lock; }; struct pblk_line_meta { unsigned int smeta_len; /* Total length for smeta */ unsigned int smeta_sec; /* Sectors needed for smeta */ unsigned int emeta_len[4]; /* Lengths for emeta: * [0]: Total * [1]: struct line_emeta + * bb_bitmap + struct wa_counters * [2]: L2P portion * [3]: vsc */ unsigned int emeta_sec[4]; /* Sectors needed for emeta. Same layout * as emeta_len */ unsigned int emeta_bb; /* Boundary for bb that affects emeta */ unsigned int vsc_list_len; /* Length for vsc list */ unsigned int sec_bitmap_len; /* Length for sector bitmap in line */ unsigned int blk_bitmap_len; /* Length for block bitmap in line */ unsigned int lun_bitmap_len; /* Length for lun bitmap in line */ unsigned int blk_per_line; /* Number of blocks in a full line */ unsigned int sec_per_line; /* Number of sectors in a line */ unsigned int dsec_per_line; /* Number of data sectors in a line */ unsigned int min_blk_line; /* Min. number of good blocks in line */ unsigned int mid_thrs; /* Threshold for GC mid list */ unsigned int high_thrs; /* Threshold for GC high list */ unsigned int meta_distance; /* Distance between data and metadata */ }; enum { PBLK_STATE_RUNNING = 0, PBLK_STATE_STOPPING = 1, PBLK_STATE_RECOVERING = 2, PBLK_STATE_STOPPED = 3, }; /* Internal format to support not power-of-2 device formats */ struct pblk_addrf { /* gen to dev */ int sec_stripe; int ch_stripe; int lun_stripe; /* dev to gen */ int sec_lun_stripe; int sec_ws_stripe; }; struct pblk { struct nvm_tgt_dev *dev; struct gendisk *disk; struct kobject kobj; struct pblk_lun *luns; struct pblk_line *lines; /* Line array */ struct pblk_line_mgmt l_mg; /* Line management */ struct pblk_line_meta lm; /* Line metadata */ struct nvm_addrf addrf; /* Aligned address format */ struct pblk_addrf uaddrf; /* Unaligned address format */ int addrf_len; struct pblk_rb rwb; int state; /* pblk line state */ int min_write_pgs; /* Minimum amount of pages required by controller */ int min_write_pgs_data; /* Minimum amount of payload pages */ int max_write_pgs; /* Maximum amount of pages supported by controller */ int oob_meta_size; /* Size of OOB sector metadata */ sector_t capacity; /* Device capacity when bad blocks are subtracted */ int op; /* Percentage of device used for over-provisioning */ int op_blks; /* Number of blocks used for over-provisioning */ /* pblk provisioning values. Used by rate limiter */ struct pblk_rl rl; int sec_per_write; guid_t instance_uuid; /* Persistent write amplification counters, 4kb sector I/Os */ atomic64_t user_wa; /* Sectors written by user */ atomic64_t gc_wa; /* Sectors written by GC */ atomic64_t pad_wa; /* Padded sectors written */ /* Reset values for delta write amplification measurements */ u64 user_rst_wa; u64 gc_rst_wa; u64 pad_rst_wa; /* Counters used for calculating padding distribution */ atomic64_t *pad_dist; /* Padding distribution buckets */ u64 nr_flush_rst; /* Flushes reset value for pad dist.*/ atomic64_t nr_flush; /* Number of flush/fua I/O */ #ifdef CONFIG_NVM_PBLK_DEBUG /* Non-persistent debug counters, 4kb sector I/Os */ atomic_long_t inflight_writes; /* Inflight writes (user and gc) */ atomic_long_t padded_writes; /* Sectors padded due to flush/fua */ atomic_long_t padded_wb; /* Sectors padded in write buffer */ atomic_long_t req_writes; /* Sectors stored on write buffer */ atomic_long_t sub_writes; /* Sectors submitted from buffer */ atomic_long_t sync_writes; /* Sectors synced to media */ atomic_long_t inflight_reads; /* Inflight sector read requests */ atomic_long_t cache_reads; /* Read requests that hit the cache */ atomic_long_t sync_reads; /* Completed sector read requests */ atomic_long_t recov_writes; /* Sectors submitted from recovery */ atomic_long_t recov_gc_writes; /* Sectors submitted from write GC */ atomic_long_t recov_gc_reads; /* Sectors submitted from read GC */ #endif spinlock_t lock; atomic_long_t read_failed; atomic_long_t read_empty; atomic_long_t read_high_ecc; atomic_long_t read_failed_gc; atomic_long_t write_failed; atomic_long_t erase_failed; atomic_t inflight_io; /* General inflight I/O counter */ struct task_struct *writer_ts; /* Simple translation map of logical addresses to physical addresses. * The logical addresses is known by the host system, while the physical * addresses are used when writing to the disk block device. */ unsigned char *trans_map; spinlock_t trans_lock; struct list_head compl_list; spinlock_t resubmit_lock; /* Resubmit list lock */ struct list_head resubmit_list; /* Resubmit list for failed writes*/ mempool_t page_bio_pool; mempool_t gen_ws_pool; mempool_t rec_pool; mempool_t r_rq_pool; mempool_t w_rq_pool; mempool_t e_rq_pool; struct workqueue_struct *close_wq; struct workqueue_struct *bb_wq; struct workqueue_struct *r_end_wq; struct timer_list wtimer; struct pblk_gc gc; }; struct pblk_line_ws { struct pblk *pblk; struct pblk_line *line; void *priv; struct work_struct ws; }; #define pblk_g_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_g_ctx)) #define pblk_w_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_c_ctx)) #define pblk_err(pblk, fmt, ...) \ pr_err("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__) #define pblk_info(pblk, fmt, ...) \ pr_info("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__) #define pblk_warn(pblk, fmt, ...) \ pr_warn("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__) #define pblk_debug(pblk, fmt, ...) \ pr_debug("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__) /* * pblk ring buffer operations */ int pblk_rb_init(struct pblk_rb *rb, unsigned int size, unsigned int threshold, unsigned int seg_sz); int pblk_rb_may_write_user(struct pblk_rb *rb, struct bio *bio, unsigned int nr_entries, unsigned int *pos); int pblk_rb_may_write_gc(struct pblk_rb *rb, unsigned int nr_entries, unsigned int *pos); void pblk_rb_write_entry_user(struct pblk_rb *rb, void *data, struct pblk_w_ctx w_ctx, unsigned int pos); void pblk_rb_write_entry_gc(struct pblk_rb *rb, void *data, struct pblk_w_ctx w_ctx, struct pblk_line *line, u64 paddr, unsigned int pos); struct pblk_w_ctx *pblk_rb_w_ctx(struct pblk_rb *rb, unsigned int pos); void pblk_rb_flush(struct pblk_rb *rb); void pblk_rb_sync_l2p(struct pblk_rb *rb); unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd, unsigned int pos, unsigned int nr_entries, unsigned int count); int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba, struct ppa_addr ppa); unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int entries); unsigned int pblk_rb_sync_init(struct pblk_rb *rb, unsigned long *flags); unsigned int pblk_rb_sync_advance(struct pblk_rb *rb, unsigned int nr_entries); unsigned int pblk_rb_ptr_wrap(struct pblk_rb *rb, unsigned int p, unsigned int nr_entries); void pblk_rb_sync_end(struct pblk_rb *rb, unsigned long *flags); unsigned int pblk_rb_flush_point_count(struct pblk_rb *rb); unsigned int pblk_rb_read_count(struct pblk_rb *rb); unsigned int pblk_rb_sync_count(struct pblk_rb *rb); unsigned int pblk_rb_wrap_pos(struct pblk_rb *rb, unsigned int pos); int pblk_rb_tear_down_check(struct pblk_rb *rb); int pblk_rb_pos_oob(struct pblk_rb *rb, u64 pos); void pblk_rb_free(struct pblk_rb *rb); ssize_t pblk_rb_sysfs(struct pblk_rb *rb, char *buf); /* * pblk core */ struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type); void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type); int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd); void pblk_free_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd); void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write); int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd, struct pblk_c_ctx *c_ctx); void pblk_discard(struct pblk *pblk, struct bio *bio); struct nvm_chk_meta *pblk_get_chunk_meta(struct pblk *pblk); struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk, struct nvm_chk_meta *lp, struct ppa_addr ppa); void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd); void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd); int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd, void *buf); int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd, void *buf); int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line); void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd); struct pblk_line *pblk_line_get(struct pblk *pblk); struct pblk_line *pblk_line_get_first_data(struct pblk *pblk); struct pblk_line *pblk_line_replace_data(struct pblk *pblk); void pblk_ppa_to_line_put(struct pblk *pblk, struct ppa_addr ppa); void pblk_rq_to_line_put(struct pblk *pblk, struct nvm_rq *rqd); int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line); void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line); struct pblk_line *pblk_line_get_data(struct pblk *pblk); struct pblk_line *pblk_line_get_erase(struct pblk *pblk); int pblk_line_erase(struct pblk *pblk, struct pblk_line *line); int pblk_line_is_full(struct pblk_line *line); void pblk_line_free(struct pblk_line *line); void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line); void pblk_line_close(struct pblk *pblk, struct pblk_line *line); void pblk_line_close_ws(struct work_struct *work); void pblk_pipeline_stop(struct pblk *pblk); void __pblk_pipeline_stop(struct pblk *pblk); void __pblk_pipeline_flush(struct pblk *pblk); void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, void (*work)(struct work_struct *), gfp_t gfp_mask, struct workqueue_struct *wq); u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line); int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line); int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line, void *emeta_buf); int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr erase_ppa); void pblk_line_put(struct kref *ref); void pblk_line_put_wq(struct kref *ref); struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line); u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line); void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs); u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs); u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs); int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail, unsigned long secs_to_flush, bool skip_meta); void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa, unsigned long *lun_bitmap); void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa); void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa); void pblk_up_rq(struct pblk *pblk, unsigned long *lun_bitmap); int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags, int nr_pages); void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off, int nr_pages); void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa); void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line, u64 paddr); void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa); void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa); void pblk_update_map_dev(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, struct ppa_addr entry_line); int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, struct pblk_line *gc_line, u64 paddr); void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas, u64 *lba_list, int nr_secs); int pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas, sector_t blba, int nr_secs, bool *from_cache); void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd); void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd); /* * pblk user I/O write path */ void pblk_write_to_cache(struct pblk *pblk, struct bio *bio, unsigned long flags); int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq); /* * pblk map */ int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry, unsigned long *lun_bitmap, unsigned int valid_secs, struct ppa_addr *erase_ppa); int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry, unsigned long *lun_bitmap, unsigned int valid_secs, unsigned int off); /* * pblk write thread */ int pblk_write_ts(void *data); void pblk_write_timer_fn(struct timer_list *t); void pblk_write_should_kick(struct pblk *pblk); void pblk_write_kick(struct pblk *pblk); /* * pblk read path */ extern struct bio_set pblk_bio_set; void pblk_submit_read(struct pblk *pblk, struct bio *bio); int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq); /* * pblk recovery */ struct pblk_line *pblk_recov_l2p(struct pblk *pblk); int pblk_recov_pad(struct pblk *pblk); int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta); /* * pblk gc */ #define PBLK_GC_MAX_READERS 8 /* Max number of outstanding GC reader jobs */ #define PBLK_GC_RQ_QD 128 /* Queue depth for inflight GC requests */ #define PBLK_GC_L_QD 4 /* Queue depth for inflight GC lines */ int pblk_gc_init(struct pblk *pblk); void pblk_gc_exit(struct pblk *pblk, bool graceful); void pblk_gc_should_start(struct pblk *pblk); void pblk_gc_should_stop(struct pblk *pblk); void pblk_gc_should_kick(struct pblk *pblk); void pblk_gc_free_full_lines(struct pblk *pblk); void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled, int *gc_active); int pblk_gc_sysfs_force(struct pblk *pblk, int force); void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line); /* * pblk rate limiter */ void pblk_rl_init(struct pblk_rl *rl, int budget, int threshold); void pblk_rl_free(struct pblk_rl *rl); void pblk_rl_update_rates(struct pblk_rl *rl); int pblk_rl_high_thrs(struct pblk_rl *rl); unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl); unsigned long pblk_rl_nr_user_free_blks(struct pblk_rl *rl); int pblk_rl_user_may_insert(struct pblk_rl *rl, int nr_entries); void pblk_rl_inserted(struct pblk_rl *rl, int nr_entries); void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries); int pblk_rl_gc_may_insert(struct pblk_rl *rl, int nr_entries); void pblk_rl_gc_in(struct pblk_rl *rl, int nr_entries); void pblk_rl_out(struct pblk_rl *rl, int nr_user, int nr_gc); int pblk_rl_max_io(struct pblk_rl *rl); void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line); void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line, bool used); int pblk_rl_is_limit(struct pblk_rl *rl); void pblk_rl_werr_line_in(struct pblk_rl *rl); void pblk_rl_werr_line_out(struct pblk_rl *rl); /* * pblk sysfs */ int pblk_sysfs_init(struct gendisk *tdisk); void pblk_sysfs_exit(struct gendisk *tdisk); static inline struct nvm_rq *nvm_rq_from_c_ctx(void *c_ctx) { return c_ctx - sizeof(struct nvm_rq); } static inline void *emeta_to_bb(struct line_emeta *emeta) { return emeta->bb_bitmap; } static inline void *emeta_to_wa(struct pblk_line_meta *lm, struct line_emeta *emeta) { return emeta->bb_bitmap + lm->blk_bitmap_len; } static inline void *emeta_to_lbas(struct pblk *pblk, struct line_emeta *emeta) { return ((void *)emeta + pblk->lm.emeta_len[1]); } static inline void *emeta_to_vsc(struct pblk *pblk, struct line_emeta *emeta) { return (emeta_to_lbas(pblk, emeta) + pblk->lm.emeta_len[2]); } static inline int pblk_line_vsc(struct pblk_line *line) { return le32_to_cpu(*line->vsc); } static inline int pblk_ppa_to_line_id(struct ppa_addr p) { return p.a.blk; } static inline struct pblk_line *pblk_ppa_to_line(struct pblk *pblk, struct ppa_addr p) { return &pblk->lines[pblk_ppa_to_line_id(p)]; } static inline int pblk_ppa_to_pos(struct nvm_geo *geo, struct ppa_addr p) { return p.a.lun * geo->num_ch + p.a.ch; } static inline struct ppa_addr addr_to_gen_ppa(struct pblk *pblk, u64 paddr, u64 line_id) { struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; struct ppa_addr ppa; if (geo->version == NVM_OCSSD_SPEC_12) { struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&pblk->addrf; ppa.ppa = 0; ppa.g.blk = line_id; ppa.g.pg = (paddr & ppaf->pg_mask) >> ppaf->pg_offset; ppa.g.lun = (paddr & ppaf->lun_mask) >> ppaf->lun_offset; ppa.g.ch = (paddr & ppaf->ch_mask) >> ppaf->ch_offset; ppa.g.pl = (paddr & ppaf->pln_mask) >> ppaf->pln_offset; ppa.g.sec = (paddr & ppaf->sec_mask) >> ppaf->sec_offset; } else { struct pblk_addrf *uaddrf = &pblk->uaddrf; int secs, chnls, luns; ppa.ppa = 0; ppa.m.chk = line_id; paddr = div_u64_rem(paddr, uaddrf->sec_stripe, &secs); ppa.m.sec = secs; paddr = div_u64_rem(paddr, uaddrf->ch_stripe, &chnls); ppa.m.grp = chnls; paddr = div_u64_rem(paddr, uaddrf->lun_stripe, &luns); ppa.m.pu = luns; ppa.m.sec += uaddrf->sec_stripe * paddr; } return ppa; } static inline struct nvm_chk_meta *pblk_dev_ppa_to_chunk(struct pblk *pblk, struct ppa_addr p) { struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; struct pblk_line *line = pblk_ppa_to_line(pblk, p); int pos = pblk_ppa_to_pos(geo, p); return &line->chks[pos]; } static inline u64 pblk_dev_ppa_to_chunk_addr(struct pblk *pblk, struct ppa_addr p) { struct nvm_tgt_dev *dev = pblk->dev; return dev_to_chunk_addr(dev->parent, &pblk->addrf, p); } static inline u64 pblk_dev_ppa_to_line_addr(struct pblk *pblk, struct ppa_addr p) { struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; u64 paddr; if (geo->version == NVM_OCSSD_SPEC_12) { struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&pblk->addrf; paddr = (u64)p.g.ch << ppaf->ch_offset; paddr |= (u64)p.g.lun << ppaf->lun_offset; paddr |= (u64)p.g.pg << ppaf->pg_offset; paddr |= (u64)p.g.pl << ppaf->pln_offset; paddr |= (u64)p.g.sec << ppaf->sec_offset; } else { struct pblk_addrf *uaddrf = &pblk->uaddrf; u64 secs = p.m.sec; int sec_stripe; paddr = (u64)p.m.grp * uaddrf->sec_stripe; paddr += (u64)p.m.pu * uaddrf->sec_lun_stripe; secs = div_u64_rem(secs, uaddrf->sec_stripe, &sec_stripe); paddr += secs * uaddrf->sec_ws_stripe; paddr += sec_stripe; } return paddr; } static inline struct ppa_addr pblk_ppa32_to_ppa64(struct pblk *pblk, u32 ppa32) { struct nvm_tgt_dev *dev = pblk->dev; return nvm_ppa32_to_ppa64(dev->parent, &pblk->addrf, ppa32); } static inline u32 pblk_ppa64_to_ppa32(struct pblk *pblk, struct ppa_addr ppa64) { struct nvm_tgt_dev *dev = pblk->dev; return nvm_ppa64_to_ppa32(dev->parent, &pblk->addrf, ppa64); } static inline struct ppa_addr pblk_trans_map_get(struct pblk *pblk, sector_t lba) { struct ppa_addr ppa; if (pblk->addrf_len < 32) { u32 *map = (u32 *)pblk->trans_map; ppa = pblk_ppa32_to_ppa64(pblk, map[lba]); } else { struct ppa_addr *map = (struct ppa_addr *)pblk->trans_map; ppa = map[lba]; } return ppa; } static inline void pblk_trans_map_set(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) { if (pblk->addrf_len < 32) { u32 *map = (u32 *)pblk->trans_map; map[lba] = pblk_ppa64_to_ppa32(pblk, ppa); } else { u64 *map = (u64 *)pblk->trans_map; map[lba] = ppa.ppa; } } static inline int pblk_ppa_empty(struct ppa_addr ppa_addr) { return (ppa_addr.ppa == ADDR_EMPTY); } static inline void pblk_ppa_set_empty(struct ppa_addr *ppa_addr) { ppa_addr->ppa = ADDR_EMPTY; } static inline bool pblk_ppa_comp(struct ppa_addr lppa, struct ppa_addr rppa) { return (lppa.ppa == rppa.ppa); } static inline int pblk_addr_in_cache(struct ppa_addr ppa) { return (ppa.ppa != ADDR_EMPTY && ppa.c.is_cached); } static inline int pblk_addr_to_cacheline(struct ppa_addr ppa) { return ppa.c.line; } static inline struct ppa_addr pblk_cacheline_to_addr(int addr) { struct ppa_addr p; p.c.line = addr; p.c.is_cached = 1; return p; } static inline u32 pblk_calc_meta_header_crc(struct pblk *pblk, struct line_header *header) { u32 crc = ~(u32)0; crc = crc32_le(crc, (unsigned char *)header + sizeof(crc), sizeof(struct line_header) - sizeof(crc)); return crc; } static inline u32 pblk_calc_smeta_crc(struct pblk *pblk, struct line_smeta *smeta) { struct pblk_line_meta *lm = &pblk->lm; u32 crc = ~(u32)0; crc = crc32_le(crc, (unsigned char *)smeta + sizeof(struct line_header) + sizeof(crc), lm->smeta_len - sizeof(struct line_header) - sizeof(crc)); return crc; } static inline u32 pblk_calc_emeta_crc(struct pblk *pblk, struct line_emeta *emeta) { struct pblk_line_meta *lm = &pblk->lm; u32 crc = ~(u32)0; crc = crc32_le(crc, (unsigned char *)emeta + sizeof(struct line_header) + sizeof(crc), lm->emeta_len[0] - sizeof(struct line_header) - sizeof(crc)); return crc; } static inline int pblk_io_aligned(struct pblk *pblk, int nr_secs) { return !(nr_secs % pblk->min_write_pgs); } #ifdef CONFIG_NVM_PBLK_DEBUG static inline void print_ppa(struct pblk *pblk, struct ppa_addr *p, char *msg, int error) { struct nvm_geo *geo = &pblk->dev->geo; if (p->c.is_cached) { pblk_err(pblk, "ppa: (%s: %x) cache line: %llu\n", msg, error, (u64)p->c.line); } else if (geo->version == NVM_OCSSD_SPEC_12) { pblk_err(pblk, "ppa: (%s: %x):ch:%d,lun:%d,blk:%d,pg:%d,pl:%d,sec:%d\n", msg, error, p->g.ch, p->g.lun, p->g.blk, p->g.pg, p->g.pl, p->g.sec); } else { pblk_err(pblk, "ppa: (%s: %x):ch:%d,lun:%d,chk:%d,sec:%d\n", msg, error, p->m.grp, p->m.pu, p->m.chk, p->m.sec); } } static inline void pblk_print_failed_rqd(struct pblk *pblk, struct nvm_rq *rqd, int error) { int bit = -1; if (rqd->nr_ppas == 1) { print_ppa(pblk, &rqd->ppa_addr, "rqd", error); return; } while ((bit = find_next_bit((void *)&rqd->ppa_status, rqd->nr_ppas, bit + 1)) < rqd->nr_ppas) { print_ppa(pblk, &rqd->ppa_list[bit], "rqd", error); } pblk_err(pblk, "error:%d, ppa_status:%llx\n", error, rqd->ppa_status); } static inline int pblk_boundary_ppa_checks(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int nr_ppas) { struct nvm_geo *geo = &tgt_dev->geo; struct ppa_addr *ppa; int i; for (i = 0; i < nr_ppas; i++) { ppa = &ppas[i]; if (geo->version == NVM_OCSSD_SPEC_12) { if (!ppa->c.is_cached && ppa->g.ch < geo->num_ch && ppa->g.lun < geo->num_lun && ppa->g.pl < geo->num_pln && ppa->g.blk < geo->num_chk && ppa->g.pg < geo->num_pg && ppa->g.sec < geo->ws_min) continue; } else { if (!ppa->c.is_cached && ppa->m.grp < geo->num_ch && ppa->m.pu < geo->num_lun && ppa->m.chk < geo->num_chk && ppa->m.sec < geo->clba) continue; } print_ppa(tgt_dev->q->queuedata, ppa, "boundary", i); return 1; } return 0; } static inline int pblk_check_io(struct pblk *pblk, struct nvm_rq *rqd) { struct nvm_tgt_dev *dev = pblk->dev; struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) { WARN_ON(1); return -EINVAL; } if (rqd->opcode == NVM_OP_PWRITE) { struct pblk_line *line; int i; for (i = 0; i < rqd->nr_ppas; i++) { line = pblk_ppa_to_line(pblk, ppa_list[i]); spin_lock(&line->lock); if (line->state != PBLK_LINESTATE_OPEN) { pblk_err(pblk, "bad ppa: line:%d,state:%d\n", line->id, line->state); WARN_ON(1); spin_unlock(&line->lock); return -EINVAL; } spin_unlock(&line->lock); } } return 0; } #endif static inline int pblk_boundary_paddr_checks(struct pblk *pblk, u64 paddr) { struct pblk_line_meta *lm = &pblk->lm; if (paddr > lm->sec_per_line) return 1; return 0; } static inline unsigned int pblk_get_bi_idx(struct bio *bio) { return bio->bi_iter.bi_idx; } static inline sector_t pblk_get_lba(struct bio *bio) { return bio->bi_iter.bi_sector / NR_PHY_IN_LOG; } static inline unsigned int pblk_get_secs(struct bio *bio) { return bio->bi_iter.bi_size / PBLK_EXPOSED_PAGE_SIZE; } static inline char *pblk_disk_name(struct pblk *pblk) { struct gendisk *disk = pblk->disk; return disk->disk_name; } static inline unsigned int pblk_get_min_chks(struct pblk *pblk) { struct pblk_line_meta *lm = &pblk->lm; /* In a worst-case scenario every line will have OP invalid sectors. * We will then need a minimum of 1/OP lines to free up a single line */ return DIV_ROUND_UP(100, pblk->op) * lm->blk_per_line; } static inline struct pblk_sec_meta *pblk_get_meta(struct pblk *pblk, void *meta, int index) { return meta + max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size) * index; } static inline int pblk_dma_meta_size(struct pblk *pblk) { return max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size) * NVM_MAX_VLBA; } static inline int pblk_is_oob_meta_supported(struct pblk *pblk) { return pblk->oob_meta_size >= sizeof(struct pblk_sec_meta); } #endif /* PBLK_H_ */
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