lightnvm: remove rrpc

The hybrid mode for 1.2 revision was deprecated, and have
no users. Remove to make it easier to move to the 2.0 revision.
Signed-off-by: NMatias Bjørling <m@bjorling.me>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/lightnvm/Kconfig

@@ -27,13 +27,6 @@ config NVM_DEBUG
 
 	It is required to create/remove targets without IOCTLs.
 
-config NVM_RRPC
-	tristate "Round-robin Hybrid Open-Channel SSD target"
-	---help---
-	Allows an open-channel SSD to be exposed as a block device to the
-	host. The target is implemented using a linear mapping table and
-	cost-based garbage collection. It is optimized for 4K IO sizes.
-
 config NVM_PBLK
 	tristate "Physical Block Device Open-Channel SSD target"
 	---help---

drivers/lightnvm/Makefile

@@ -4,7 +4,6 @@
 #
 
 obj-$(CONFIG_NVM)		:= core.o
-obj-$(CONFIG_NVM_RRPC)		+= rrpc.o
 obj-$(CONFIG_NVM_PBLK)		+= pblk.o
 pblk-y				:= pblk-init.o pblk-core.o pblk-rb.o \
 				   pblk-write.o pblk-cache.o pblk-read.o \

drivers/lightnvm/rrpc.h

-/*
- * 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;
-	unsigned long flags;
-};
-
-struct rrpc_block {
-	int id;				/* id inside of LUN */
-	struct rrpc_lun *rlun;
-
-	struct list_head prio;		/* LUN CG list */
-	struct list_head list;		/* LUN free, used, bb list */
-
-#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;
-
-	int state;
-
-	spinlock_t lock;
-	atomic_t data_cmnt_size; /* data pages committed to stable storage */
-};
-
-struct rrpc_lun {
-	struct rrpc *rrpc;
-
-	int id;
-	struct ppa_addr bppa;
-
-	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 */
-
-	/* lun block lists */
-	struct list_head used_list;	/* In-use blocks */
-	struct list_head free_list;	/* Not used blocks i.e. released
-					 * and ready for use
-					 */
-	struct list_head bb_list;	/* Bad blocks. Mutually exclusive with
-					 * free_list and used_list
-					 */
-	unsigned int nr_free_blocks;	/* Number of unused blocks */
-
-	struct work_struct ws_gc;
-
-	int reserved_blocks;
-
-	spinlock_t lock;
-};
-
-struct rrpc {
-	struct nvm_tgt_dev *dev;
-	struct gendisk *disk;
-
-	sector_t soffset; /* logical sector offset */
-
-	int nr_luns;
-	struct rrpc_lun *luns;
-
-	/* calculated values */
-	unsigned long long nr_sects;
-
-	/* 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 ppa_addr rrpc_linear_to_generic_addr(struct nvm_geo *geo,
-							  struct ppa_addr r)
-{
-	struct ppa_addr l;
-	int secs, pgs;
-	sector_t ppa = r.ppa;
-
-	l.ppa = 0;
-
-	div_u64_rem(ppa, geo->sec_per_pg, &secs);
-	l.g.sec = secs;
-
-	sector_div(ppa, geo->sec_per_pg);
-	div_u64_rem(ppa, geo->pgs_per_blk, &pgs);
-	l.g.pg = pgs;
-
-	return l;
-}
-
-static inline struct ppa_addr rrpc_recov_addr(struct nvm_tgt_dev *dev, u64 pba)
-{
-	return linear_to_generic_addr(&dev->geo, pba);
-}
-
-static inline u64 rrpc_blk_to_ppa(struct rrpc *rrpc, struct rrpc_block *rblk)
-{
-	struct nvm_tgt_dev *dev = rrpc->dev;
-	struct nvm_geo *geo = &dev->geo;
-	struct rrpc_lun *rlun = rblk->rlun;
-
-	return (rlun->id * geo->sec_per_lun) + (rblk->id * geo->sec_per_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_ */