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linux/drivers/lightnvm/pblk.h

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/* 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)
#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)
/* 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_meta_size (sizeof(struct pblk_sec_meta) * NVM_MAX_VLBA)
#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;
};
/* partial read context */
struct pblk_pr_ctx {
struct bio *orig_bio;
DECLARE_BITMAP(bitmap, NVM_MAX_VLBA);
unsigned int orig_nr_secs;
unsigned int bio_init_idx;
void *ppa_ptr;
dma_addr_t dma_ppa_list;
};
/* 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 long nr_secs;
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;
__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 smeta_ssec; /* Sector where smeta starts */
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 */
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_KMALLOC_META = 1,
PBLK_VMALLOC_META = 2,
};
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 */
/* Metadata allocation type: VMALLOC | KMALLOC */
int emeta_alloc_type;
/* 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 max_write_pgs; /* Maximum amount of pages supported by controller */
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;
unsigned char instance_uuid[16];
/* 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, int bio_iter, bool advanced_bio);
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);
int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd);
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 bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
unsigned int nr_secs, unsigned int len,
int alloc_type, 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);
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);
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);
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, struct pblk_gc_rq *gc_rq);
/*
* 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(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;
int 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 */
#define PBLK_GC_RSV_LINE 1 /* Reserved lines for GC */
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);
/*
* pblk rate limiter
*/
void pblk_rl_init(struct pblk_rl *rl, int budget);
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 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 *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 void pblk_setup_uuid(struct pblk *pblk)
{
uuid_le uuid;
uuid_le_gen(&uuid);
memcpy(pblk->instance_uuid, uuid.b, 16);
}
static inline char *pblk_disk_name(struct pblk *pblk)
{
struct gendisk *disk = pblk->disk;
return disk->disk_name;
}
#endif /* PBLK_H_ */
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