forked from Minki/linux
855cdd2c0b
The nvm_get_blk() function is called with rlun->lock held. This is ok when the media manager implementation doesn't go out of its atomic context. However, if a media manager persists its metadata, and guarantees that the block is given to the target, this is no longer a viable approach. Therefore, clean up the flow of rrpc_map_page, and make sure that nvm_get_blk() is called without any locks acquired. Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
255 lines
6.1 KiB
C
255 lines
6.1 KiB
C
/*
|
|
* Copyright (C) 2015 IT University of Copenhagen
|
|
* Initial release: Matias Bjorling <m@bjorling.me>
|
|
*
|
|
* 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 Round-robin page-based Hybrid FTL for Open-channel SSDs.
|
|
*/
|
|
|
|
#ifndef RRPC_H_
|
|
#define RRPC_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/lightnvm.h>
|
|
|
|
/* Run only GC if less than 1/X blocks are free */
|
|
#define GC_LIMIT_INVERSE 10
|
|
#define GC_TIME_SECS 100
|
|
|
|
#define RRPC_SECTOR (512)
|
|
#define RRPC_EXPOSED_PAGE_SIZE (4096)
|
|
|
|
#define NR_PHY_IN_LOG (RRPC_EXPOSED_PAGE_SIZE / RRPC_SECTOR)
|
|
|
|
struct rrpc_inflight {
|
|
struct list_head reqs;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
struct rrpc_inflight_rq {
|
|
struct list_head list;
|
|
sector_t l_start;
|
|
sector_t l_end;
|
|
};
|
|
|
|
struct rrpc_rq {
|
|
struct rrpc_inflight_rq inflight_rq;
|
|
struct rrpc_addr *addr;
|
|
unsigned long flags;
|
|
};
|
|
|
|
struct rrpc_block {
|
|
struct nvm_block *parent;
|
|
struct rrpc_lun *rlun;
|
|
struct list_head prio;
|
|
|
|
#define MAX_INVALID_PAGES_STORAGE 8
|
|
/* Bitmap for invalid page intries */
|
|
unsigned long invalid_pages[MAX_INVALID_PAGES_STORAGE];
|
|
/* points to the next writable page within a block */
|
|
unsigned int next_page;
|
|
/* number of pages that are invalid, wrt host page size */
|
|
unsigned int nr_invalid_pages;
|
|
|
|
spinlock_t lock;
|
|
atomic_t data_cmnt_size; /* data pages committed to stable storage */
|
|
};
|
|
|
|
struct rrpc_lun {
|
|
struct rrpc *rrpc;
|
|
struct nvm_lun *parent;
|
|
struct rrpc_block *cur, *gc_cur;
|
|
struct rrpc_block *blocks; /* Reference to block allocation */
|
|
|
|
struct list_head prio_list; /* Blocks that may be GC'ed */
|
|
struct list_head wblk_list; /* Queued blocks to be written to */
|
|
|
|
struct work_struct ws_gc;
|
|
|
|
spinlock_t lock;
|
|
};
|
|
|
|
struct rrpc {
|
|
/* instance must be kept in top to resolve rrpc in unprep */
|
|
struct nvm_tgt_instance instance;
|
|
|
|
struct nvm_dev *dev;
|
|
struct gendisk *disk;
|
|
|
|
sector_t soffset; /* logical sector offset */
|
|
u64 poffset; /* physical page offset */
|
|
int lun_offset;
|
|
|
|
int nr_luns;
|
|
struct rrpc_lun *luns;
|
|
|
|
/* calculated values */
|
|
unsigned long long nr_sects;
|
|
unsigned long total_blocks;
|
|
|
|
/* Write strategy variables. Move these into each for structure for each
|
|
* strategy
|
|
*/
|
|
atomic_t next_lun; /* Whenever a page is written, this is updated
|
|
* to point to the next write lun
|
|
*/
|
|
|
|
spinlock_t bio_lock;
|
|
struct bio_list requeue_bios;
|
|
struct work_struct ws_requeue;
|
|
|
|
/* 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.
|
|
*/
|
|
struct rrpc_addr *trans_map;
|
|
/* also store a reverse map for garbage collection */
|
|
struct rrpc_rev_addr *rev_trans_map;
|
|
spinlock_t rev_lock;
|
|
|
|
struct rrpc_inflight inflights;
|
|
|
|
mempool_t *addr_pool;
|
|
mempool_t *page_pool;
|
|
mempool_t *gcb_pool;
|
|
mempool_t *rq_pool;
|
|
|
|
struct timer_list gc_timer;
|
|
struct workqueue_struct *krqd_wq;
|
|
struct workqueue_struct *kgc_wq;
|
|
};
|
|
|
|
struct rrpc_block_gc {
|
|
struct rrpc *rrpc;
|
|
struct rrpc_block *rblk;
|
|
struct work_struct ws_gc;
|
|
};
|
|
|
|
/* Logical to physical mapping */
|
|
struct rrpc_addr {
|
|
u64 addr;
|
|
struct rrpc_block *rblk;
|
|
};
|
|
|
|
/* Physical to logical mapping */
|
|
struct rrpc_rev_addr {
|
|
u64 addr;
|
|
};
|
|
|
|
static inline struct rrpc_block *rrpc_get_rblk(struct rrpc_lun *rlun,
|
|
int blk_id)
|
|
{
|
|
struct rrpc *rrpc = rlun->rrpc;
|
|
int lun_blk = blk_id % rrpc->dev->blks_per_lun;
|
|
|
|
return &rlun->blocks[lun_blk];
|
|
}
|
|
|
|
static inline sector_t rrpc_get_laddr(struct bio *bio)
|
|
{
|
|
return bio->bi_iter.bi_sector / NR_PHY_IN_LOG;
|
|
}
|
|
|
|
static inline unsigned int rrpc_get_pages(struct bio *bio)
|
|
{
|
|
return bio->bi_iter.bi_size / RRPC_EXPOSED_PAGE_SIZE;
|
|
}
|
|
|
|
static inline sector_t rrpc_get_sector(sector_t laddr)
|
|
{
|
|
return laddr * NR_PHY_IN_LOG;
|
|
}
|
|
|
|
static inline int request_intersects(struct rrpc_inflight_rq *r,
|
|
sector_t laddr_start, sector_t laddr_end)
|
|
{
|
|
return (laddr_end >= r->l_start) && (laddr_start <= r->l_end);
|
|
}
|
|
|
|
static int __rrpc_lock_laddr(struct rrpc *rrpc, sector_t laddr,
|
|
unsigned int pages, struct rrpc_inflight_rq *r)
|
|
{
|
|
sector_t laddr_end = laddr + pages - 1;
|
|
struct rrpc_inflight_rq *rtmp;
|
|
|
|
WARN_ON(irqs_disabled());
|
|
|
|
spin_lock_irq(&rrpc->inflights.lock);
|
|
list_for_each_entry(rtmp, &rrpc->inflights.reqs, list) {
|
|
if (unlikely(request_intersects(rtmp, laddr, laddr_end))) {
|
|
/* existing, overlapping request, come back later */
|
|
spin_unlock_irq(&rrpc->inflights.lock);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
r->l_start = laddr;
|
|
r->l_end = laddr_end;
|
|
|
|
list_add_tail(&r->list, &rrpc->inflights.reqs);
|
|
spin_unlock_irq(&rrpc->inflights.lock);
|
|
return 0;
|
|
}
|
|
|
|
static inline int rrpc_lock_laddr(struct rrpc *rrpc, sector_t laddr,
|
|
unsigned int pages,
|
|
struct rrpc_inflight_rq *r)
|
|
{
|
|
BUG_ON((laddr + pages) > rrpc->nr_sects);
|
|
|
|
return __rrpc_lock_laddr(rrpc, laddr, pages, r);
|
|
}
|
|
|
|
static inline struct rrpc_inflight_rq *rrpc_get_inflight_rq(struct nvm_rq *rqd)
|
|
{
|
|
struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
|
|
|
|
return &rrqd->inflight_rq;
|
|
}
|
|
|
|
static inline int rrpc_lock_rq(struct rrpc *rrpc, struct bio *bio,
|
|
struct nvm_rq *rqd)
|
|
{
|
|
sector_t laddr = rrpc_get_laddr(bio);
|
|
unsigned int pages = rrpc_get_pages(bio);
|
|
struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
|
|
|
|
return rrpc_lock_laddr(rrpc, laddr, pages, r);
|
|
}
|
|
|
|
static inline void rrpc_unlock_laddr(struct rrpc *rrpc,
|
|
struct rrpc_inflight_rq *r)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&rrpc->inflights.lock, flags);
|
|
list_del_init(&r->list);
|
|
spin_unlock_irqrestore(&rrpc->inflights.lock, flags);
|
|
}
|
|
|
|
static inline void rrpc_unlock_rq(struct rrpc *rrpc, struct nvm_rq *rqd)
|
|
{
|
|
struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
|
|
uint8_t pages = rqd->nr_ppas;
|
|
|
|
BUG_ON((r->l_start + pages) > rrpc->nr_sects);
|
|
|
|
rrpc_unlock_laddr(rrpc, r);
|
|
}
|
|
|
|
#endif /* RRPC_H_ */
|