diff options
Diffstat (limited to 'drivers/lightnvm/pblk.h')
| -rw-r--r-- | drivers/lightnvm/pblk.h | 1121 |
1 files changed, 1121 insertions, 0 deletions
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h new file mode 100644 index 000000000000..c82120ce3be5 --- /dev/null +++ b/drivers/lightnvm/pblk.h @@ -0,0 +1,1121 @@ +/* + * 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_MAX_REQ_ADDRS (64) +#define PBLK_MAX_REQ_ADDRS_PW (6) + +#define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16) + +#define PBLK_COMMAND_TIMEOUT_MS 30000 + +/* Max 512 LUNs per device */ +#define PBLK_MAX_LUNS_BITMAP (4) + +#define NR_PHY_IN_LOG (PBLK_EXPOSED_PAGE_SIZE / PBLK_SECTOR) + +#define pblk_for_each_lun(pblk, rlun, i) \ + for ((i) = 0, rlun = &(pblk)->luns[0]; \ + (i) < (pblk)->nr_luns; (i)++, rlun = &(pblk)->luns[(i)]) + +#define ERASE 2 /* READ = 0, WRITE = 1 */ + +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, +}; + +/* 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_NR_GC_LISTS 3 +#define PBLK_MAX_GC_JOBS 32 + +enum { + PBLK_RL_HIGH = 1, + PBLK_RL_MID = 2, + PBLK_RL_LOW = 3, +}; + +struct pblk_sec_meta { + u64 reserved; + __le64 lba; +}; + +#define pblk_dma_meta_size (sizeof(struct pblk_sec_meta) * PBLK_MAX_REQ_ADDRS) + +/* write 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_r_ctx { + struct bio *orig_bio; +}; + +/* Recovery context */ +struct pblk_rec_ctx { + struct pblk *pblk; + struct nvm_rq *rqd; + struct list_head failed; + 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 + */ + sector_t 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 sync_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 + */ + + struct list_head pages; /* List of data pages */ + + spinlock_t w_lock; /* Write lock */ + spinlock_t s_lock; /* Sync lock */ + +#ifdef CONFIG_NVM_DEBUG + atomic_t inflight_sync_point; /* Not served REQ_FLUSH | REQ_FUA */ +#endif +}; + +#define PBLK_RECOVERY_SECTORS 16 + +struct pblk_lun { + struct ppa_addr bppa; + + u8 *bb_list; /* Bad block list for LUN. Only used on + * bring up. Bad blocks are managed + * within lines on run-time. + */ + + struct semaphore wr_sem; +}; + +struct pblk_gc_rq { + struct pblk_line *line; + void *data; + u64 *lba_list; + int nr_secs; + int secs_to_gc; + struct list_head list; +}; + +struct pblk_gc { + int gc_active; + int gc_enabled; + int gc_forced; + int gc_jobs_active; + atomic_t inflight_gc; + + struct task_struct *gc_ts; + struct task_struct *gc_writer_ts; + struct workqueue_struct *gc_reader_wq; + struct timer_list gc_timer; + + int w_entries; + struct list_head w_list; + + spinlock_t lock; + spinlock_t w_lock; +}; + +struct pblk_rl { + unsigned int high; /* Upper threshold for rate limiter (free run - + * user I/O rate limiter + */ + unsigned int low; /* Lower threshold for rate limiter (user I/O + * rate limiter - stall) + */ + unsigned int high_pw; /* High rounded up as a power of 2 */ + +#define PBLK_USER_HIGH_THRS 2 /* Begin write limit at 50 percent + * available blks + */ +#define PBLK_USER_LOW_THRS 20 /* Aggressive GC at 5% 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 */ + atomic_t rb_user_cnt; /* User I/O buffer counter */ + 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 */ + atomic_t rb_gc_cnt; /* GC I/O buffer counter */ + + int rb_user_active; + struct timer_list u_timer; + + unsigned long long nr_secs; + unsigned long total_blocks; + atomic_t free_blocks; +}; + +#define PBLK_LINE_NR_LUN_BITMAP 2 +#define PBLK_LINE_NR_SEC_BITMAP 2 +#define PBLK_LINE_EMPTY (~0U) + +enum { + /* Line Types */ + PBLK_LINETYPE_FREE = 0, + PBLK_LINETYPE_LOG = 1, + PBLK_LINETYPE_DATA = 2, + + /* Line state */ + 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, +}; + +#define PBLK_MAGIC 0x70626c6b /*pblk*/ + +struct line_header { + __le32 crc; + __le32 identifier; /* pblk identifier */ + __u8 uuid[16]; /* instance uuid */ + __le16 type; /* line type */ + __le16 version; /* type version */ + __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]; +}; + +/* + * Metadata Layout: + * 1. struct pblk_emeta + * 2. nr_lbas u64 forming lba list + * 3. nr_lines (all) u32 valid sector count (vsc) (~0U: non-alloc line) + * 4. nr_luns bits (u64 format) forming line bad block bitmap + * + * 3. and 4. will be part of FTL log + */ +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 */ +}; + +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 line_smeta *smeta; /* Start metadata */ + struct line_emeta *emeta; /* End metadata */ + int meta_line; /* Metadata line id */ + u64 smeta_ssec; /* Sector where smeta starts */ + u64 emeta_ssec; /* Sector where emeta starts */ + + unsigned int sec_in_line; /* Number of usable secs in line */ + + unsigned int 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 */ + + int left_eblks; /* Blocks left for erasing */ + atomic_t left_seblks; /* Blocks left for sync erasing */ + + int left_msecs; /* Sectors left for mapping */ + int left_ssecs; /* Sectors left to sync */ + unsigned int cur_sec; /* Sector map pointer */ + unsigned int vsc; /* Valid sector count in line */ + + struct kref ref; /* Write buffer L2P references */ + + spinlock_t lock; /* Necessary for invalid_bitmap only */ +}; + +#define PBLK_DATA_LINES 2 + +enum{ + PBLK_KMALLOC_META = 1, + PBLK_VMALLOC_META = 2, +}; + +struct pblk_line_metadata { + void *meta; +}; + +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_NR_GC_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_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 */ + + /* Metadata allocation type: VMALLOC | KMALLOC */ + int smeta_alloc_type; + int emeta_alloc_type; + + /* Pre-allocated metadata for data lines */ + struct pblk_line_metadata sline_meta[PBLK_DATA_LINES]; + struct pblk_line_metadata eline_meta[PBLK_DATA_LINES]; + unsigned long meta_bitmap; + + /* 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 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; /* Total length for emeta */ + unsigned int emeta_sec; /* Sectors needed for emeta*/ + unsigned int emeta_bb; /* Boundary for bb that affects emeta */ + 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 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 */ +}; + +struct pblk_addr_format { + u64 ch_mask; + u64 lun_mask; + u64 pln_mask; + u64 blk_mask; + u64 pg_mask; + u64 sec_mask; + u8 ch_offset; + u8 lun_offset; + u8 pln_offset; + u8 blk_offset; + u8 pg_offset; + u8 sec_offset; +}; + +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 */ + + int ppaf_bitsize; + struct pblk_addr_format ppaf; + + struct pblk_rb rwb; + + int min_write_pgs; /* Minimum amount of pages required by controller */ + int max_write_pgs; /* Maximum amount of pages supported by controller */ + int pgs_in_buffer; /* Number of pages that need to be held in buffer to + * guarantee successful reads. + */ + + sector_t capacity; /* Device capacity when bad blocks are subtracted */ + int over_pct; /* Percentage of device used for over-provisioning */ + + /* pblk provisioning values. Used by rate limiter */ + struct pblk_rl rl; + + struct semaphore erase_sem; + + unsigned char instance_uuid[16]; +#ifdef CONFIG_NVM_DEBUG + /* All debug counters apply to 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 nr_flush; /* Number of flush/fua I/O */ + 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 compl_writes; /* Sectors completed in write bio */ + atomic_long_t inflight_reads; /* Inflight sector read requests */ + 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; + + 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; + + mempool_t *page_pool; + mempool_t *line_ws_pool; + mempool_t *rec_pool; + mempool_t *r_rq_pool; + mempool_t *w_rq_pool; + mempool_t *line_meta_pool; + + struct workqueue_struct *kw_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_r_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_r_ctx)) +#define pblk_w_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_c_ctx)) + +/* + * pblk ring buffer operations + */ +int pblk_rb_init(struct pblk_rb *rb, struct pblk_rb_entry *rb_entry_base, + unsigned int power_size, unsigned int power_seg_sz); +unsigned int pblk_rb_calculate_size(unsigned int nr_entries); +void *pblk_rb_entries_ref(struct pblk_rb *rb); +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 *gc_line, + unsigned int pos); +struct pblk_w_ctx *pblk_rb_w_ctx(struct pblk_rb *rb, unsigned int pos); + +void pblk_rb_sync_l2p(struct pblk_rb *rb); +unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct bio *bio, + struct pblk_c_ctx *c_ctx, + unsigned int pos, + unsigned int nr_entries, + unsigned int count); +unsigned int pblk_rb_read_to_bio_list(struct pblk_rb *rb, struct bio *bio, + struct list_head *list, + unsigned int max); +int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba, + u64 pos, int bio_iter); +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); +struct pblk_rb_entry *pblk_rb_sync_scan_entry(struct pblk_rb *rb, + struct ppa_addr *ppa); +void pblk_rb_sync_end(struct pblk_rb *rb, unsigned long *flags); +unsigned int pblk_rb_sync_point_count(struct pblk_rb *rb); + +unsigned int pblk_rb_read_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_data_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 rw); +int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd, + struct pblk_c_ctx *c_ctx); +void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw); +void pblk_flush_writer(struct pblk *pblk); +struct ppa_addr pblk_get_lba_map(struct pblk *pblk, sector_t lba); +void pblk_discard(struct pblk *pblk, struct bio *bio); +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); +struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data, + unsigned int nr_secs, unsigned int len, + gfp_t gfp_mask); +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); +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_data_next(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 *pblk, struct pblk_line *line); +void pblk_line_close_ws(struct work_struct *work); +void pblk_line_close(struct pblk *pblk, struct pblk_line *line); +void pblk_line_mark_bb(struct work_struct *work); +void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, + void (*work)(struct work_struct *)); +u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line); +int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line); +int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line); +int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr erase_ppa); +void pblk_line_put(struct kref *ref); +struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line); +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); +void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas, + unsigned long *lun_bitmap); +void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas, + unsigned long *lun_bitmap); +void pblk_end_bio_sync(struct bio *bio); +void pblk_end_io_sync(struct nvm_rq *rqd); +int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags, + int nr_pages); +void pblk_map_pad_invalidate(struct pblk *pblk, struct pblk_line *line, + u64 paddr); +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_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); +void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas, + u64 *lba_list, int nr_secs); +void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas, + sector_t blba, int nr_secs); + +/* + * pblk user I/O write path + */ +int pblk_write_to_cache(struct pblk *pblk, struct bio *bio, + unsigned long flags); +int pblk_write_gc_to_cache(struct pblk *pblk, void *data, u64 *lba_list, + unsigned int nr_entries, unsigned int nr_rec_entries, + struct pblk_line *gc_line, unsigned long flags); + +/* + * pblk map + */ +void 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); +void 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(unsigned long data); +void pblk_write_should_kick(struct pblk *pblk); + +/* + * pblk read path + */ +int pblk_submit_read(struct pblk *pblk, struct bio *bio); +int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data, + unsigned int nr_secs, unsigned int *secs_to_gc, + struct pblk_line *line); +/* + * pblk recovery + */ +void pblk_submit_rec(struct work_struct *work); +struct pblk_line *pblk_recov_l2p(struct pblk *pblk); +void pblk_recov_pad(struct pblk *pblk); +__le64 *pblk_recov_get_lba_list(struct pblk *pblk, struct line_emeta *emeta); +int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx, + struct pblk_rec_ctx *recovery, u64 *comp_bits, + unsigned int comp); + +/* + * pblk gc + */ +#define PBLK_GC_TRIES 3 + +int pblk_gc_init(struct pblk *pblk); +void pblk_gc_exit(struct pblk *pblk); +void pblk_gc_should_start(struct pblk *pblk); +void pblk_gc_should_stop(struct pblk *pblk); +int pblk_gc_status(struct pblk *pblk); +void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled, + int *gc_active); +void pblk_gc_sysfs_force(struct pblk *pblk, int force); + +/* + * pblk rate limiter + */ +void pblk_rl_init(struct pblk_rl *rl, int budget); +void pblk_rl_free(struct pblk_rl *rl); +int pblk_rl_gc_thrs(struct pblk_rl *rl); +unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl); +int pblk_rl_user_may_insert(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); +void pblk_rl_set_gc_rsc(struct pblk_rl *rl, int rsv); +int pblk_rl_sysfs_rate_show(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); + +/* + * pblk sysfs + */ +int pblk_sysfs_init(struct gendisk *tdisk); +void pblk_sysfs_exit(struct gendisk *tdisk); + +static inline void *pblk_malloc(size_t size, int type, gfp_t flags) +{ + if (type == PBLK_KMALLOC_META) + return kmalloc(size, flags); + return vmalloc(size); +} + +static inline void pblk_mfree(void *ptr, int type) +{ + if (type == PBLK_KMALLOC_META) + kfree(ptr); + else + vfree(ptr); +} + +static inline struct nvm_rq *nvm_rq_from_c_ctx(void *c_ctx) +{ + return c_ctx - sizeof(struct nvm_rq); +} + +static inline void *pblk_line_emeta_to_lbas(struct line_emeta *emeta) +{ + return (emeta) + 1; +} + +#define NVM_MEM_PAGE_WRITE (8) + +static inline int pblk_pad_distance(struct pblk *pblk) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + + return NVM_MEM_PAGE_WRITE * geo->nr_luns * geo->sec_per_pl; +} + +static inline int pblk_dev_ppa_to_line(struct ppa_addr p) +{ + return p.g.blk; +} + +static inline int pblk_tgt_ppa_to_line(struct ppa_addr p) +{ + return p.g.blk; +} + +static inline int pblk_ppa_to_pos(struct nvm_geo *geo, struct ppa_addr p) +{ + return p.g.lun * geo->nr_chnls + p.g.ch; +} + +/* A block within a line corresponds to the lun */ +static inline int pblk_dev_ppa_to_pos(struct nvm_geo *geo, struct ppa_addr p) +{ + return p.g.lun * geo->nr_chnls + p.g.ch; +} + +static inline struct ppa_addr pblk_ppa32_to_ppa64(struct pblk *pblk, u32 ppa32) +{ + struct ppa_addr ppa64; + + ppa64.ppa = 0; + + if (ppa32 == -1) { + ppa64.ppa = ADDR_EMPTY; + } else if (ppa32 & (1U << 31)) { + ppa64.c.line = ppa32 & ((~0U) >> 1); + ppa64.c.is_cached = 1; + } else { + ppa64.g.blk = (ppa32 & pblk->ppaf.blk_mask) >> + pblk->ppaf.blk_offset; + ppa64.g.pg = (ppa32 & pblk->ppaf.pg_mask) >> + pblk->ppaf.pg_offset; + ppa64.g.lun = (ppa32 & pblk->ppaf.lun_mask) >> + pblk->ppaf.lun_offset; + ppa64.g.ch = (ppa32 & pblk->ppaf.ch_mask) >> + pblk->ppaf.ch_offset; + ppa64.g.pl = (ppa32 & pblk->ppaf.pln_mask) >> + pblk->ppaf.pln_offset; + ppa64.g.sec = (ppa32 & pblk->ppaf.sec_mask) >> + pblk->ppaf.sec_offset; + } + + return ppa64; +} + +static inline struct ppa_addr pblk_trans_map_get(struct pblk *pblk, + sector_t lba) +{ + struct ppa_addr ppa; + + if (pblk->ppaf_bitsize < 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 u32 pblk_ppa64_to_ppa32(struct pblk *pblk, struct ppa_addr ppa64) +{ + u32 ppa32 = 0; + + if (ppa64.ppa == ADDR_EMPTY) { + ppa32 = ~0U; + } else if (ppa64.c.is_cached) { + ppa32 |= ppa64.c.line; + ppa32 |= 1U << 31; + } else { + ppa32 |= ppa64.g.blk << pblk->ppaf.blk_offset; + ppa32 |= ppa64.g.pg << pblk->ppaf.pg_offset; + ppa32 |= ppa64.g.lun << pblk->ppaf.lun_offset; + ppa32 |= ppa64.g.ch << pblk->ppaf.ch_offset; + ppa32 |= ppa64.g.pl << pblk->ppaf.pln_offset; + ppa32 |= ppa64.g.sec << pblk->ppaf.sec_offset; + } + + return ppa32; +} + +static inline void pblk_trans_map_set(struct pblk *pblk, sector_t lba, + struct ppa_addr ppa) +{ + if (pblk->ppaf_bitsize < 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 u64 pblk_dev_ppa_to_line_addr(struct pblk *pblk, + struct ppa_addr p) +{ + u64 paddr; + + paddr = 0; + paddr |= (u64)p.g.pg << pblk->ppaf.pg_offset; + paddr |= (u64)p.g.lun << pblk->ppaf.lun_offset; + paddr |= (u64)p.g.ch << pblk->ppaf.ch_offset; + paddr |= (u64)p.g.pl << pblk->ppaf.pln_offset; + paddr |= (u64)p.g.sec << pblk->ppaf.sec_offset; + + return paddr; +} + +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 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 struct ppa_addr addr_to_gen_ppa(struct pblk *pblk, u64 paddr, + u64 line_id) +{ + struct ppa_addr ppa; + + ppa.ppa = 0; + ppa.g.blk = line_id; + ppa.g.pg = (paddr & pblk->ppaf.pg_mask) >> pblk->ppaf.pg_offset; + ppa.g.lun = (paddr & pblk->ppaf.lun_mask) >> pblk->ppaf.lun_offset; + ppa.g.ch = (paddr & pblk->ppaf.ch_mask) >> pblk->ppaf.ch_offset; + ppa.g.pl = (paddr & pblk->ppaf.pln_mask) >> pblk->ppaf.pln_offset; + ppa.g.sec = (paddr & pblk->ppaf.sec_mask) >> pblk->ppaf.sec_offset; + + return ppa; +} + +static inline struct ppa_addr addr_to_pblk_ppa(struct pblk *pblk, u64 paddr, + u64 line_id) +{ + struct ppa_addr ppa; + + ppa = addr_to_gen_ppa(pblk, paddr, line_id); + + return ppa; +} + +static inline u32 pblk_calc_meta_header_crc(struct pblk *pblk, + struct line_smeta *smeta) +{ + u32 crc = ~(u32)0; + + crc = crc32_le(crc, (unsigned char *)smeta + 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 - + sizeof(struct line_header) - sizeof(crc)); + + return crc; +} + +static inline int pblk_set_progr_mode(struct pblk *pblk, int type) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + int flags; + + flags = geo->plane_mode >> 1; + + if (type == WRITE) + flags |= NVM_IO_SCRAMBLE_ENABLE; + + return flags; +} + +static inline int pblk_set_read_mode(struct pblk *pblk) +{ + return NVM_IO_SNGL_ACCESS | NVM_IO_SUSPEND | NVM_IO_SCRAMBLE_ENABLE; +} + +#ifdef CONFIG_NVM_DEBUG +static inline void print_ppa(struct ppa_addr *p, char *msg, int error) +{ + if (p->c.is_cached) { + pr_err("ppa: (%s: %x) cache line: %llu\n", + msg, error, (u64)p->c.line); + } else { + pr_err("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); + } +} + +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(&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(&rqd->ppa_list[bit], "rqd", error); + } + + pr_err("error:%d, ppa_status:%llx\n", error, rqd->ppa_status); +} +#endif + +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 (!ppa->c.is_cached && + ppa->g.ch < geo->nr_chnls && + ppa->g.lun < geo->luns_per_chnl && + ppa->g.pl < geo->nr_planes && + ppa->g.blk < geo->blks_per_lun && + ppa->g.pg < geo->pgs_per_blk && + ppa->g.sec < geo->sec_per_pg) + continue; + +#ifdef CONFIG_NVM_DEBUG + print_ppa(ppa, "boundary", i); +#endif + return 1; + } + return 0; +} + +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 sector_t pblk_get_sector(sector_t lba) +{ + return lba * NR_PHY_IN_LOG; +} + +static inline void pblk_setup_uuid(struct pblk *pblk) +{ + uuid_le uuid; + + uuid_le_gen(&uuid); + memcpy(pblk->instance_uuid, uuid.b, 16); +} +#endif /* PBLK_H_ */ |