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    Subject[GIT PULL 02/25] lightnvm: remove rrpc
    Date
    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: Matias Bjørling <m@bjorling.me>
    ---
    drivers/lightnvm/Kconfig | 7 -
    drivers/lightnvm/Makefile | 1 -
    drivers/lightnvm/rrpc.c | 1625 ---------------------------------------------
    drivers/lightnvm/rrpc.h | 290 --------
    4 files changed, 1923 deletions(-)
    delete mode 100644 drivers/lightnvm/rrpc.c
    delete mode 100644 drivers/lightnvm/rrpc.h

    diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig
    index 2a953ef..10c0898 100644
    --- a/drivers/lightnvm/Kconfig
    +++ b/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---
    diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile
    index 2c3fd9d..97d9d7c 100644
    --- a/drivers/lightnvm/Makefile
    +++ b/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 \
    diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
    deleted file mode 100644
    index 0993c14..0000000
    --- a/drivers/lightnvm/rrpc.c
    +++ /dev/null
    @@ -1,1625 +0,0 @@
    -/*
    - * 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.
    - */
    -
    -#include "rrpc.h"
    -
    -static struct kmem_cache *rrpc_gcb_cache, *rrpc_rq_cache;
    -static DECLARE_RWSEM(rrpc_lock);
    -
    -static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
    - struct nvm_rq *rqd, unsigned long flags);
    -
    -#define rrpc_for_each_lun(rrpc, rlun, i) \
    - for ((i) = 0, rlun = &(rrpc)->luns[0]; \
    - (i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)])
    -
    -static void rrpc_page_invalidate(struct rrpc *rrpc, struct rrpc_addr *a)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_block *rblk = a->rblk;
    - unsigned int pg_offset;
    -
    - lockdep_assert_held(&rrpc->rev_lock);
    -
    - if (a->addr == ADDR_EMPTY || !rblk)
    - return;
    -
    - spin_lock(&rblk->lock);
    -
    - div_u64_rem(a->addr, dev->geo.sec_per_blk, &pg_offset);
    - WARN_ON(test_and_set_bit(pg_offset, rblk->invalid_pages));
    - rblk->nr_invalid_pages++;
    -
    - spin_unlock(&rblk->lock);
    -
    - rrpc->rev_trans_map[a->addr].addr = ADDR_EMPTY;
    -}
    -
    -static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba,
    - unsigned int len)
    -{
    - sector_t i;
    -
    - spin_lock(&rrpc->rev_lock);
    - for (i = slba; i < slba + len; i++) {
    - struct rrpc_addr *gp = &rrpc->trans_map[i];
    -
    - rrpc_page_invalidate(rrpc, gp);
    - gp->rblk = NULL;
    - }
    - spin_unlock(&rrpc->rev_lock);
    -}
    -
    -static struct nvm_rq *rrpc_inflight_laddr_acquire(struct rrpc *rrpc,
    - sector_t laddr, unsigned int pages)
    -{
    - struct nvm_rq *rqd;
    - struct rrpc_inflight_rq *inf;
    -
    - rqd = mempool_alloc(rrpc->rq_pool, GFP_ATOMIC);
    - if (!rqd)
    - return ERR_PTR(-ENOMEM);
    -
    - inf = rrpc_get_inflight_rq(rqd);
    - if (rrpc_lock_laddr(rrpc, laddr, pages, inf)) {
    - mempool_free(rqd, rrpc->rq_pool);
    - return NULL;
    - }
    -
    - return rqd;
    -}
    -
    -static void rrpc_inflight_laddr_release(struct rrpc *rrpc, struct nvm_rq *rqd)
    -{
    - struct rrpc_inflight_rq *inf = rrpc_get_inflight_rq(rqd);
    -
    - rrpc_unlock_laddr(rrpc, inf);
    -
    - mempool_free(rqd, rrpc->rq_pool);
    -}
    -
    -static void rrpc_discard(struct rrpc *rrpc, struct bio *bio)
    -{
    - sector_t slba = bio->bi_iter.bi_sector / NR_PHY_IN_LOG;
    - sector_t len = bio->bi_iter.bi_size / RRPC_EXPOSED_PAGE_SIZE;
    - struct nvm_rq *rqd;
    -
    - while (1) {
    - rqd = rrpc_inflight_laddr_acquire(rrpc, slba, len);
    - if (rqd)
    - break;
    -
    - schedule();
    - }
    -
    - if (IS_ERR(rqd)) {
    - pr_err("rrpc: unable to acquire inflight IO\n");
    - bio_io_error(bio);
    - return;
    - }
    -
    - rrpc_invalidate_range(rrpc, slba, len);
    - rrpc_inflight_laddr_release(rrpc, rqd);
    -}
    -
    -static int block_is_full(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    -
    - return (rblk->next_page == dev->geo.sec_per_blk);
    -}
    -
    -/* Calculate relative addr for the given block, considering instantiated LUNs */
    -static u64 block_to_rel_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_lun *rlun = rblk->rlun;
    -
    - return rlun->id * dev->geo.sec_per_blk;
    -}
    -
    -static struct ppa_addr rrpc_ppa_to_gaddr(struct nvm_tgt_dev *dev,
    - struct rrpc_addr *gp)
    -{
    - struct rrpc_block *rblk = gp->rblk;
    - struct rrpc_lun *rlun = rblk->rlun;
    - u64 addr = gp->addr;
    - struct ppa_addr paddr;
    -
    - paddr.ppa = addr;
    - paddr = rrpc_linear_to_generic_addr(&dev->geo, paddr);
    - paddr.g.ch = rlun->bppa.g.ch;
    - paddr.g.lun = rlun->bppa.g.lun;
    - paddr.g.blk = rblk->id;
    -
    - return paddr;
    -}
    -
    -/* requires lun->lock taken */
    -static void rrpc_set_lun_cur(struct rrpc_lun *rlun, struct rrpc_block *new_rblk,
    - struct rrpc_block **cur_rblk)
    -{
    - struct rrpc *rrpc = rlun->rrpc;
    -
    - if (*cur_rblk) {
    - spin_lock(&(*cur_rblk)->lock);
    - WARN_ON(!block_is_full(rrpc, *cur_rblk));
    - spin_unlock(&(*cur_rblk)->lock);
    - }
    - *cur_rblk = new_rblk;
    -}
    -
    -static struct rrpc_block *__rrpc_get_blk(struct rrpc *rrpc,
    - struct rrpc_lun *rlun)
    -{
    - struct rrpc_block *rblk = NULL;
    -
    - if (list_empty(&rlun->free_list))
    - goto out;
    -
    - rblk = list_first_entry(&rlun->free_list, struct rrpc_block, list);
    -
    - list_move_tail(&rblk->list, &rlun->used_list);
    - rblk->state = NVM_BLK_ST_TGT;
    - rlun->nr_free_blocks--;
    -
    -out:
    - return rblk;
    -}
    -
    -static struct rrpc_block *rrpc_get_blk(struct rrpc *rrpc, struct rrpc_lun *rlun,
    - unsigned long flags)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_block *rblk;
    - int is_gc = flags & NVM_IOTYPE_GC;
    -
    - spin_lock(&rlun->lock);
    - if (!is_gc && rlun->nr_free_blocks < rlun->reserved_blocks) {
    - pr_err("nvm: rrpc: cannot give block to non GC request\n");
    - spin_unlock(&rlun->lock);
    - return NULL;
    - }
    -
    - rblk = __rrpc_get_blk(rrpc, rlun);
    - if (!rblk) {
    - pr_err("nvm: rrpc: cannot get new block\n");
    - spin_unlock(&rlun->lock);
    - return NULL;
    - }
    - spin_unlock(&rlun->lock);
    -
    - bitmap_zero(rblk->invalid_pages, dev->geo.sec_per_blk);
    - rblk->next_page = 0;
    - rblk->nr_invalid_pages = 0;
    - atomic_set(&rblk->data_cmnt_size, 0);
    -
    - return rblk;
    -}
    -
    -static void rrpc_put_blk(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - struct rrpc_lun *rlun = rblk->rlun;
    -
    - spin_lock(&rlun->lock);
    - if (rblk->state & NVM_BLK_ST_TGT) {
    - list_move_tail(&rblk->list, &rlun->free_list);
    - rlun->nr_free_blocks++;
    - rblk->state = NVM_BLK_ST_FREE;
    - } else if (rblk->state & NVM_BLK_ST_BAD) {
    - list_move_tail(&rblk->list, &rlun->bb_list);
    - rblk->state = NVM_BLK_ST_BAD;
    - } else {
    - WARN_ON_ONCE(1);
    - pr_err("rrpc: erroneous type (ch:%d,lun:%d,blk%d-> %u)\n",
    - rlun->bppa.g.ch, rlun->bppa.g.lun,
    - rblk->id, rblk->state);
    - list_move_tail(&rblk->list, &rlun->bb_list);
    - }
    - spin_unlock(&rlun->lock);
    -}
    -
    -static void rrpc_put_blks(struct rrpc *rrpc)
    -{
    - struct rrpc_lun *rlun;
    - int i;
    -
    - for (i = 0; i < rrpc->nr_luns; i++) {
    - rlun = &rrpc->luns[i];
    - if (rlun->cur)
    - rrpc_put_blk(rrpc, rlun->cur);
    - if (rlun->gc_cur)
    - rrpc_put_blk(rrpc, rlun->gc_cur);
    - }
    -}
    -
    -static struct rrpc_lun *get_next_lun(struct rrpc *rrpc)
    -{
    - int next = atomic_inc_return(&rrpc->next_lun);
    -
    - return &rrpc->luns[next % rrpc->nr_luns];
    -}
    -
    -static void rrpc_gc_kick(struct rrpc *rrpc)
    -{
    - struct rrpc_lun *rlun;
    - unsigned int i;
    -
    - for (i = 0; i < rrpc->nr_luns; i++) {
    - rlun = &rrpc->luns[i];
    - queue_work(rrpc->krqd_wq, &rlun->ws_gc);
    - }
    -}
    -
    -/*
    - * timed GC every interval.
    - */
    -static void rrpc_gc_timer(struct timer_list *t)
    -{
    - struct rrpc *rrpc = from_timer(rrpc, t, gc_timer);
    -
    - rrpc_gc_kick(rrpc);
    - mod_timer(&rrpc->gc_timer, jiffies + msecs_to_jiffies(10));
    -}
    -
    -static void rrpc_end_sync_bio(struct bio *bio)
    -{
    - struct completion *waiting = bio->bi_private;
    -
    - if (bio->bi_status)
    - pr_err("nvm: gc request failed (%u).\n", bio->bi_status);
    -
    - complete(waiting);
    -}
    -
    -/*
    - * rrpc_move_valid_pages -- migrate live data off the block
    - * @rrpc: the 'rrpc' structure
    - * @block: the block from which to migrate live pages
    - *
    - * Description:
    - * GC algorithms may call this function to migrate remaining live
    - * pages off the block prior to erasing it. This function blocks
    - * further execution until the operation is complete.
    - */
    -static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct request_queue *q = dev->q;
    - struct rrpc_rev_addr *rev;
    - struct nvm_rq *rqd;
    - struct bio *bio;
    - struct page *page;
    - int slot;
    - int nr_sec_per_blk = dev->geo.sec_per_blk;
    - u64 phys_addr;
    - DECLARE_COMPLETION_ONSTACK(wait);
    -
    - if (bitmap_full(rblk->invalid_pages, nr_sec_per_blk))
    - return 0;
    -
    - bio = bio_alloc(GFP_NOIO, 1);
    - if (!bio) {
    - pr_err("nvm: could not alloc bio to gc\n");
    - return -ENOMEM;
    - }
    -
    - page = mempool_alloc(rrpc->page_pool, GFP_NOIO);
    -
    - while ((slot = find_first_zero_bit(rblk->invalid_pages,
    - nr_sec_per_blk)) < nr_sec_per_blk) {
    -
    - /* Lock laddr */
    - phys_addr = rrpc_blk_to_ppa(rrpc, rblk) + slot;
    -
    -try:
    - spin_lock(&rrpc->rev_lock);
    - /* Get logical address from physical to logical table */
    - rev = &rrpc->rev_trans_map[phys_addr];
    - /* already updated by previous regular write */
    - if (rev->addr == ADDR_EMPTY) {
    - spin_unlock(&rrpc->rev_lock);
    - continue;
    - }
    -
    - rqd = rrpc_inflight_laddr_acquire(rrpc, rev->addr, 1);
    - if (IS_ERR_OR_NULL(rqd)) {
    - spin_unlock(&rrpc->rev_lock);
    - schedule();
    - goto try;
    - }
    -
    - spin_unlock(&rrpc->rev_lock);
    -
    - /* Perform read to do GC */
    - bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr);
    - bio_set_op_attrs(bio, REQ_OP_READ, 0);
    - bio->bi_private = &wait;
    - bio->bi_end_io = rrpc_end_sync_bio;
    -
    - /* TODO: may fail when EXP_PG_SIZE > PAGE_SIZE */
    - bio_add_pc_page(q, bio, page, RRPC_EXPOSED_PAGE_SIZE, 0);
    -
    - if (rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_GC)) {
    - pr_err("rrpc: gc read failed.\n");
    - rrpc_inflight_laddr_release(rrpc, rqd);
    - goto finished;
    - }
    - wait_for_completion_io(&wait);
    - if (bio->bi_status) {
    - rrpc_inflight_laddr_release(rrpc, rqd);
    - goto finished;
    - }
    -
    - bio_reset(bio);
    - reinit_completion(&wait);
    -
    - bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr);
    - bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
    - bio->bi_private = &wait;
    - bio->bi_end_io = rrpc_end_sync_bio;
    -
    - bio_add_pc_page(q, bio, page, RRPC_EXPOSED_PAGE_SIZE, 0);
    -
    - /* turn the command around and write the data back to a new
    - * address
    - */
    - if (rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_GC)) {
    - pr_err("rrpc: gc write failed.\n");
    - rrpc_inflight_laddr_release(rrpc, rqd);
    - goto finished;
    - }
    - wait_for_completion_io(&wait);
    -
    - rrpc_inflight_laddr_release(rrpc, rqd);
    - if (bio->bi_status)
    - goto finished;
    -
    - bio_reset(bio);
    - }
    -
    -finished:
    - mempool_free(page, rrpc->page_pool);
    - bio_put(bio);
    -
    - if (!bitmap_full(rblk->invalid_pages, nr_sec_per_blk)) {
    - pr_err("nvm: failed to garbage collect block\n");
    - return -EIO;
    - }
    -
    - return 0;
    -}
    -
    -static void rrpc_block_gc(struct work_struct *work)
    -{
    - struct rrpc_block_gc *gcb = container_of(work, struct rrpc_block_gc,
    - ws_gc);
    - struct rrpc *rrpc = gcb->rrpc;
    - struct rrpc_block *rblk = gcb->rblk;
    - struct rrpc_lun *rlun = rblk->rlun;
    - struct ppa_addr ppa;
    -
    - mempool_free(gcb, rrpc->gcb_pool);
    - pr_debug("nvm: block 'ch:%d,lun:%d,blk:%d' being reclaimed\n",
    - rlun->bppa.g.ch, rlun->bppa.g.lun,
    - rblk->id);
    -
    - if (rrpc_move_valid_pages(rrpc, rblk))
    - goto put_back;
    -
    - ppa.ppa = 0;
    - ppa.g.ch = rlun->bppa.g.ch;
    - ppa.g.lun = rlun->bppa.g.lun;
    - ppa.g.blk = rblk->id;
    -
    - if (nvm_erase_sync(rrpc->dev, &ppa, 1))
    - goto put_back;
    -
    - rrpc_put_blk(rrpc, rblk);
    -
    - return;
    -
    -put_back:
    - spin_lock(&rlun->lock);
    - list_add_tail(&rblk->prio, &rlun->prio_list);
    - spin_unlock(&rlun->lock);
    -}
    -
    -/* the block with highest number of invalid pages, will be in the beginning
    - * of the list
    - */
    -static struct rrpc_block *rblk_max_invalid(struct rrpc_block *ra,
    - struct rrpc_block *rb)
    -{
    - if (ra->nr_invalid_pages == rb->nr_invalid_pages)
    - return ra;
    -
    - return (ra->nr_invalid_pages < rb->nr_invalid_pages) ? rb : ra;
    -}
    -
    -/* linearly find the block with highest number of invalid pages
    - * requires lun->lock
    - */
    -static struct rrpc_block *block_prio_find_max(struct rrpc_lun *rlun)
    -{
    - struct list_head *prio_list = &rlun->prio_list;
    - struct rrpc_block *rblk, *max;
    -
    - BUG_ON(list_empty(prio_list));
    -
    - max = list_first_entry(prio_list, struct rrpc_block, prio);
    - list_for_each_entry(rblk, prio_list, prio)
    - max = rblk_max_invalid(max, rblk);
    -
    - return max;
    -}
    -
    -static void rrpc_lun_gc(struct work_struct *work)
    -{
    - struct rrpc_lun *rlun = container_of(work, struct rrpc_lun, ws_gc);
    - struct rrpc *rrpc = rlun->rrpc;
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_block_gc *gcb;
    - unsigned int nr_blocks_need;
    -
    - nr_blocks_need = dev->geo.blks_per_lun / GC_LIMIT_INVERSE;
    -
    - if (nr_blocks_need < rrpc->nr_luns)
    - nr_blocks_need = rrpc->nr_luns;
    -
    - spin_lock(&rlun->lock);
    - while (nr_blocks_need > rlun->nr_free_blocks &&
    - !list_empty(&rlun->prio_list)) {
    - struct rrpc_block *rblk = block_prio_find_max(rlun);
    -
    - if (!rblk->nr_invalid_pages)
    - break;
    -
    - gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
    - if (!gcb)
    - break;
    -
    - list_del_init(&rblk->prio);
    -
    - WARN_ON(!block_is_full(rrpc, rblk));
    -
    - pr_debug("rrpc: selected block 'ch:%d,lun:%d,blk:%d' for GC\n",
    - rlun->bppa.g.ch, rlun->bppa.g.lun,
    - rblk->id);
    -
    - gcb->rrpc = rrpc;
    - gcb->rblk = rblk;
    - INIT_WORK(&gcb->ws_gc, rrpc_block_gc);
    -
    - queue_work(rrpc->kgc_wq, &gcb->ws_gc);
    -
    - nr_blocks_need--;
    - }
    - spin_unlock(&rlun->lock);
    -
    - /* TODO: Hint that request queue can be started again */
    -}
    -
    -static void rrpc_gc_queue(struct work_struct *work)
    -{
    - struct rrpc_block_gc *gcb = container_of(work, struct rrpc_block_gc,
    - ws_gc);
    - struct rrpc *rrpc = gcb->rrpc;
    - struct rrpc_block *rblk = gcb->rblk;
    - struct rrpc_lun *rlun = rblk->rlun;
    -
    - spin_lock(&rlun->lock);
    - list_add_tail(&rblk->prio, &rlun->prio_list);
    - spin_unlock(&rlun->lock);
    -
    - mempool_free(gcb, rrpc->gcb_pool);
    - pr_debug("nvm: block 'ch:%d,lun:%d,blk:%d' full, allow GC (sched)\n",
    - rlun->bppa.g.ch, rlun->bppa.g.lun,
    - rblk->id);
    -}
    -
    -static const struct block_device_operations rrpc_fops = {
    - .owner = THIS_MODULE,
    -};
    -
    -static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc)
    -{
    - unsigned int i;
    - struct rrpc_lun *rlun, *max_free;
    -
    - if (!is_gc)
    - return get_next_lun(rrpc);
    -
    - /* during GC, we don't care about RR, instead we want to make
    - * sure that we maintain evenness between the block luns.
    - */
    - max_free = &rrpc->luns[0];
    - /* prevent GC-ing lun from devouring pages of a lun with
    - * little free blocks. We don't take the lock as we only need an
    - * estimate.
    - */
    - rrpc_for_each_lun(rrpc, rlun, i) {
    - if (rlun->nr_free_blocks > max_free->nr_free_blocks)
    - max_free = rlun;
    - }
    -
    - return max_free;
    -}
    -
    -static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr,
    - struct rrpc_block *rblk, u64 paddr)
    -{
    - struct rrpc_addr *gp;
    - struct rrpc_rev_addr *rev;
    -
    - BUG_ON(laddr >= rrpc->nr_sects);
    -
    - gp = &rrpc->trans_map[laddr];
    - spin_lock(&rrpc->rev_lock);
    - if (gp->rblk)
    - rrpc_page_invalidate(rrpc, gp);
    -
    - gp->addr = paddr;
    - gp->rblk = rblk;
    -
    - rev = &rrpc->rev_trans_map[gp->addr];
    - rev->addr = laddr;
    - spin_unlock(&rrpc->rev_lock);
    -
    - return gp;
    -}
    -
    -static u64 rrpc_alloc_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - u64 addr = ADDR_EMPTY;
    -
    - spin_lock(&rblk->lock);
    - if (block_is_full(rrpc, rblk))
    - goto out;
    -
    - addr = rblk->next_page;
    -
    - rblk->next_page++;
    -out:
    - spin_unlock(&rblk->lock);
    - return addr;
    -}
    -
    -/* Map logical address to a physical page. The mapping implements a round robin
    - * approach and allocates a page from the next lun available.
    - *
    - * Returns rrpc_addr with the physical address and block. Returns NULL if no
    - * blocks in the next rlun are available.
    - */
    -static struct ppa_addr rrpc_map_page(struct rrpc *rrpc, sector_t laddr,
    - int is_gc)
    -{
    - struct nvm_tgt_dev *tgt_dev = rrpc->dev;
    - struct rrpc_lun *rlun;
    - struct rrpc_block *rblk, **cur_rblk;
    - struct rrpc_addr *p;
    - struct ppa_addr ppa;
    - u64 paddr;
    - int gc_force = 0;
    -
    - ppa.ppa = ADDR_EMPTY;
    - rlun = rrpc_get_lun_rr(rrpc, is_gc);
    -
    - if (!is_gc && rlun->nr_free_blocks < rrpc->nr_luns * 4)
    - return ppa;
    -
    - /*
    - * page allocation steps:
    - * 1. Try to allocate new page from current rblk
    - * 2a. If succeed, proceed to map it in and return
    - * 2b. If fail, first try to allocate a new block from media manger,
    - * and then retry step 1. Retry until the normal block pool is
    - * exhausted.
    - * 3. If exhausted, and garbage collector is requesting the block,
    - * go to the reserved block and retry step 1.
    - * In the case that this fails as well, or it is not GC
    - * requesting, report not able to retrieve a block and let the
    - * caller handle further processing.
    - */
    -
    - spin_lock(&rlun->lock);
    - cur_rblk = &rlun->cur;
    - rblk = rlun->cur;
    -retry:
    - paddr = rrpc_alloc_addr(rrpc, rblk);
    -
    - if (paddr != ADDR_EMPTY)
    - goto done;
    -
    - if (!list_empty(&rlun->wblk_list)) {
    -new_blk:
    - rblk = list_first_entry(&rlun->wblk_list, struct rrpc_block,
    - prio);
    - rrpc_set_lun_cur(rlun, rblk, cur_rblk);
    - list_del(&rblk->prio);
    - goto retry;
    - }
    - spin_unlock(&rlun->lock);
    -
    - rblk = rrpc_get_blk(rrpc, rlun, gc_force);
    - if (rblk) {
    - spin_lock(&rlun->lock);
    - list_add_tail(&rblk->prio, &rlun->wblk_list);
    - /*
    - * another thread might already have added a new block,
    - * Therefore, make sure that one is used, instead of the
    - * one just added.
    - */
    - goto new_blk;
    - }
    -
    - if (unlikely(is_gc) && !gc_force) {
    - /* retry from emergency gc block */
    - cur_rblk = &rlun->gc_cur;
    - rblk = rlun->gc_cur;
    - gc_force = 1;
    - spin_lock(&rlun->lock);
    - goto retry;
    - }
    -
    - pr_err("rrpc: failed to allocate new block\n");
    - return ppa;
    -done:
    - spin_unlock(&rlun->lock);
    - p = rrpc_update_map(rrpc, laddr, rblk, paddr);
    - if (!p)
    - return ppa;
    -
    - /* return global address */
    - return rrpc_ppa_to_gaddr(tgt_dev, p);
    -}
    -
    -static void rrpc_run_gc(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - struct rrpc_block_gc *gcb;
    -
    - gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
    - if (!gcb) {
    - pr_err("rrpc: unable to queue block for gc.");
    - return;
    - }
    -
    - gcb->rrpc = rrpc;
    - gcb->rblk = rblk;
    -
    - INIT_WORK(&gcb->ws_gc, rrpc_gc_queue);
    - queue_work(rrpc->kgc_wq, &gcb->ws_gc);
    -}
    -
    -static struct rrpc_lun *rrpc_ppa_to_lun(struct rrpc *rrpc, struct ppa_addr p)
    -{
    - struct rrpc_lun *rlun = NULL;
    - int i;
    -
    - for (i = 0; i < rrpc->nr_luns; i++) {
    - if (rrpc->luns[i].bppa.g.ch == p.g.ch &&
    - rrpc->luns[i].bppa.g.lun == p.g.lun) {
    - rlun = &rrpc->luns[i];
    - break;
    - }
    - }
    -
    - return rlun;
    -}
    -
    -static void __rrpc_mark_bad_block(struct rrpc *rrpc, struct ppa_addr ppa)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_lun *rlun;
    - struct rrpc_block *rblk;
    -
    - rlun = rrpc_ppa_to_lun(rrpc, ppa);
    - rblk = &rlun->blocks[ppa.g.blk];
    - rblk->state = NVM_BLK_ST_BAD;
    -
    - nvm_set_tgt_bb_tbl(dev, &ppa, 1, NVM_BLK_T_GRWN_BAD);
    -}
    -
    -static void rrpc_mark_bad_block(struct rrpc *rrpc, struct nvm_rq *rqd)
    -{
    - void *comp_bits = &rqd->ppa_status;
    - struct ppa_addr ppa, prev_ppa;
    - int nr_ppas = rqd->nr_ppas;
    - int bit;
    -
    - if (rqd->nr_ppas == 1)
    - __rrpc_mark_bad_block(rrpc, rqd->ppa_addr);
    -
    - ppa_set_empty(&prev_ppa);
    - bit = -1;
    - while ((bit = find_next_bit(comp_bits, nr_ppas, bit + 1)) < nr_ppas) {
    - ppa = rqd->ppa_list[bit];
    - if (ppa_cmp_blk(ppa, prev_ppa))
    - continue;
    -
    - __rrpc_mark_bad_block(rrpc, ppa);
    - }
    -}
    -
    -static void rrpc_end_io_write(struct rrpc *rrpc, struct rrpc_rq *rrqd,
    - sector_t laddr, uint8_t npages)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_addr *p;
    - struct rrpc_block *rblk;
    - int cmnt_size, i;
    -
    - for (i = 0; i < npages; i++) {
    - p = &rrpc->trans_map[laddr + i];
    - rblk = p->rblk;
    -
    - cmnt_size = atomic_inc_return(&rblk->data_cmnt_size);
    - if (unlikely(cmnt_size == dev->geo.sec_per_blk))
    - rrpc_run_gc(rrpc, rblk);
    - }
    -}
    -
    -static void rrpc_end_io(struct nvm_rq *rqd)
    -{
    - struct rrpc *rrpc = rqd->private;
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
    - uint8_t npages = rqd->nr_ppas;
    - sector_t laddr = rrpc_get_laddr(rqd->bio) - npages;
    -
    - if (bio_data_dir(rqd->bio) == WRITE) {
    - if (rqd->error == NVM_RSP_ERR_FAILWRITE)
    - rrpc_mark_bad_block(rrpc, rqd);
    -
    - rrpc_end_io_write(rrpc, rrqd, laddr, npages);
    - }
    -
    - bio_put(rqd->bio);
    -
    - if (rrqd->flags & NVM_IOTYPE_GC)
    - return;
    -
    - rrpc_unlock_rq(rrpc, rqd);
    -
    - if (npages > 1)
    - nvm_dev_dma_free(dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
    -
    - mempool_free(rqd, rrpc->rq_pool);
    -}
    -
    -static int rrpc_read_ppalist_rq(struct rrpc *rrpc, struct bio *bio,
    - struct nvm_rq *rqd, unsigned long flags, int npages)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
    - struct rrpc_addr *gp;
    - sector_t laddr = rrpc_get_laddr(bio);
    - int is_gc = flags & NVM_IOTYPE_GC;
    - int i;
    -
    - if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) {
    - nvm_dev_dma_free(dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
    - return NVM_IO_REQUEUE;
    - }
    -
    - for (i = 0; i < npages; i++) {
    - /* We assume that mapping occurs at 4KB granularity */
    - BUG_ON(!(laddr + i < rrpc->nr_sects));
    - gp = &rrpc->trans_map[laddr + i];
    -
    - if (gp->rblk) {
    - rqd->ppa_list[i] = rrpc_ppa_to_gaddr(dev, gp);
    - } else {
    - BUG_ON(is_gc);
    - rrpc_unlock_laddr(rrpc, r);
    - nvm_dev_dma_free(dev->parent, rqd->ppa_list,
    - rqd->dma_ppa_list);
    - return NVM_IO_DONE;
    - }
    - }
    -
    - rqd->opcode = NVM_OP_HBREAD;
    -
    - return NVM_IO_OK;
    -}
    -
    -static int rrpc_read_rq(struct rrpc *rrpc, struct bio *bio, struct nvm_rq *rqd,
    - unsigned long flags)
    -{
    - int is_gc = flags & NVM_IOTYPE_GC;
    - sector_t laddr = rrpc_get_laddr(bio);
    - struct rrpc_addr *gp;
    -
    - if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd))
    - return NVM_IO_REQUEUE;
    -
    - BUG_ON(!(laddr < rrpc->nr_sects));
    - gp = &rrpc->trans_map[laddr];
    -
    - if (gp->rblk) {
    - rqd->ppa_addr = rrpc_ppa_to_gaddr(rrpc->dev, gp);
    - } else {
    - BUG_ON(is_gc);
    - rrpc_unlock_rq(rrpc, rqd);
    - return NVM_IO_DONE;
    - }
    -
    - rqd->opcode = NVM_OP_HBREAD;
    -
    - return NVM_IO_OK;
    -}
    -
    -static int rrpc_write_ppalist_rq(struct rrpc *rrpc, struct bio *bio,
    - struct nvm_rq *rqd, unsigned long flags, int npages)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd);
    - struct ppa_addr p;
    - sector_t laddr = rrpc_get_laddr(bio);
    - int is_gc = flags & NVM_IOTYPE_GC;
    - int i;
    -
    - if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) {
    - nvm_dev_dma_free(dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
    - return NVM_IO_REQUEUE;
    - }
    -
    - for (i = 0; i < npages; i++) {
    - /* We assume that mapping occurs at 4KB granularity */
    - p = rrpc_map_page(rrpc, laddr + i, is_gc);
    - if (p.ppa == ADDR_EMPTY) {
    - BUG_ON(is_gc);
    - rrpc_unlock_laddr(rrpc, r);
    - nvm_dev_dma_free(dev->parent, rqd->ppa_list,
    - rqd->dma_ppa_list);
    - rrpc_gc_kick(rrpc);
    - return NVM_IO_REQUEUE;
    - }
    -
    - rqd->ppa_list[i] = p;
    - }
    -
    - rqd->opcode = NVM_OP_HBWRITE;
    -
    - return NVM_IO_OK;
    -}
    -
    -static int rrpc_write_rq(struct rrpc *rrpc, struct bio *bio,
    - struct nvm_rq *rqd, unsigned long flags)
    -{
    - struct ppa_addr p;
    - int is_gc = flags & NVM_IOTYPE_GC;
    - sector_t laddr = rrpc_get_laddr(bio);
    -
    - if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd))
    - return NVM_IO_REQUEUE;
    -
    - p = rrpc_map_page(rrpc, laddr, is_gc);
    - if (p.ppa == ADDR_EMPTY) {
    - BUG_ON(is_gc);
    - rrpc_unlock_rq(rrpc, rqd);
    - rrpc_gc_kick(rrpc);
    - return NVM_IO_REQUEUE;
    - }
    -
    - rqd->ppa_addr = p;
    - rqd->opcode = NVM_OP_HBWRITE;
    -
    - return NVM_IO_OK;
    -}
    -
    -static int rrpc_setup_rq(struct rrpc *rrpc, struct bio *bio,
    - struct nvm_rq *rqd, unsigned long flags, uint8_t npages)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    -
    - if (npages > 1) {
    - rqd->ppa_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
    - &rqd->dma_ppa_list);
    - if (!rqd->ppa_list) {
    - pr_err("rrpc: not able to allocate ppa list\n");
    - return NVM_IO_ERR;
    - }
    -
    - if (bio_op(bio) == REQ_OP_WRITE)
    - return rrpc_write_ppalist_rq(rrpc, bio, rqd, flags,
    - npages);
    -
    - return rrpc_read_ppalist_rq(rrpc, bio, rqd, flags, npages);
    - }
    -
    - if (bio_op(bio) == REQ_OP_WRITE)
    - return rrpc_write_rq(rrpc, bio, rqd, flags);
    -
    - return rrpc_read_rq(rrpc, bio, rqd, flags);
    -}
    -
    -static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
    - struct nvm_rq *rqd, unsigned long flags)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_rq *rrq = nvm_rq_to_pdu(rqd);
    - uint8_t nr_pages = rrpc_get_pages(bio);
    - int bio_size = bio_sectors(bio) << 9;
    - int err;
    -
    - if (bio_size < dev->geo.sec_size)
    - return NVM_IO_ERR;
    - else if (bio_size > dev->geo.max_rq_size)
    - return NVM_IO_ERR;
    -
    - err = rrpc_setup_rq(rrpc, bio, rqd, flags, nr_pages);
    - if (err)
    - return err;
    -
    - bio_get(bio);
    - rqd->bio = bio;
    - rqd->private = rrpc;
    - rqd->nr_ppas = nr_pages;
    - rqd->end_io = rrpc_end_io;
    - rrq->flags = flags;
    -
    - err = nvm_submit_io(dev, rqd);
    - if (err) {
    - pr_err("rrpc: I/O submission failed: %d\n", err);
    - bio_put(bio);
    - if (!(flags & NVM_IOTYPE_GC)) {
    - rrpc_unlock_rq(rrpc, rqd);
    - if (rqd->nr_ppas > 1)
    - nvm_dev_dma_free(dev->parent, rqd->ppa_list,
    - rqd->dma_ppa_list);
    - }
    - return NVM_IO_ERR;
    - }
    -
    - return NVM_IO_OK;
    -}
    -
    -static blk_qc_t rrpc_make_rq(struct request_queue *q, struct bio *bio)
    -{
    - struct rrpc *rrpc = q->queuedata;
    - struct nvm_rq *rqd;
    - int err;
    -
    - blk_queue_split(q, &bio);
    -
    - if (bio_op(bio) == REQ_OP_DISCARD) {
    - rrpc_discard(rrpc, bio);
    - return BLK_QC_T_NONE;
    - }
    -
    - rqd = mempool_alloc(rrpc->rq_pool, GFP_KERNEL);
    - memset(rqd, 0, sizeof(struct nvm_rq));
    -
    - err = rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_NONE);
    - switch (err) {
    - case NVM_IO_OK:
    - return BLK_QC_T_NONE;
    - case NVM_IO_ERR:
    - bio_io_error(bio);
    - break;
    - case NVM_IO_DONE:
    - bio_endio(bio);
    - break;
    - case NVM_IO_REQUEUE:
    - spin_lock(&rrpc->bio_lock);
    - bio_list_add(&rrpc->requeue_bios, bio);
    - spin_unlock(&rrpc->bio_lock);
    - queue_work(rrpc->kgc_wq, &rrpc->ws_requeue);
    - break;
    - }
    -
    - mempool_free(rqd, rrpc->rq_pool);
    - return BLK_QC_T_NONE;
    -}
    -
    -static void rrpc_requeue(struct work_struct *work)
    -{
    - struct rrpc *rrpc = container_of(work, struct rrpc, ws_requeue);
    - struct bio_list bios;
    - struct bio *bio;
    -
    - bio_list_init(&bios);
    -
    - spin_lock(&rrpc->bio_lock);
    - bio_list_merge(&bios, &rrpc->requeue_bios);
    - bio_list_init(&rrpc->requeue_bios);
    - spin_unlock(&rrpc->bio_lock);
    -
    - while ((bio = bio_list_pop(&bios)))
    - rrpc_make_rq(rrpc->disk->queue, bio);
    -}
    -
    -static void rrpc_gc_free(struct rrpc *rrpc)
    -{
    - if (rrpc->krqd_wq)
    - destroy_workqueue(rrpc->krqd_wq);
    -
    - if (rrpc->kgc_wq)
    - destroy_workqueue(rrpc->kgc_wq);
    -}
    -
    -static int rrpc_gc_init(struct rrpc *rrpc)
    -{
    - rrpc->krqd_wq = alloc_workqueue("rrpc-lun", WQ_MEM_RECLAIM|WQ_UNBOUND,
    - rrpc->nr_luns);
    - if (!rrpc->krqd_wq)
    - return -ENOMEM;
    -
    - rrpc->kgc_wq = alloc_workqueue("rrpc-bg", WQ_MEM_RECLAIM, 1);
    - if (!rrpc->kgc_wq)
    - return -ENOMEM;
    -
    - timer_setup(&rrpc->gc_timer, rrpc_gc_timer, 0);
    -
    - return 0;
    -}
    -
    -static void rrpc_map_free(struct rrpc *rrpc)
    -{
    - vfree(rrpc->rev_trans_map);
    - vfree(rrpc->trans_map);
    -}
    -
    -static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
    -{
    - struct rrpc *rrpc = (struct rrpc *)private;
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_addr *addr = rrpc->trans_map + slba;
    - struct rrpc_rev_addr *raddr = rrpc->rev_trans_map;
    - struct rrpc_lun *rlun;
    - struct rrpc_block *rblk;
    - u64 i;
    -
    - for (i = 0; i < nlb; i++) {
    - struct ppa_addr gaddr;
    - u64 pba = le64_to_cpu(entries[i]);
    - unsigned int mod;
    -
    - /* LNVM treats address-spaces as silos, LBA and PBA are
    - * equally large and zero-indexed.
    - */
    - if (unlikely(pba >= dev->total_secs && pba != U64_MAX)) {
    - pr_err("nvm: L2P data entry is out of bounds!\n");
    - pr_err("nvm: Maybe loaded an old target L2P\n");
    - return -EINVAL;
    - }
    -
    - /* Address zero is a special one. The first page on a disk is
    - * protected. As it often holds internal device boot
    - * information.
    - */
    - if (!pba)
    - continue;
    -
    - div_u64_rem(pba, rrpc->nr_sects, &mod);
    -
    - gaddr = rrpc_recov_addr(dev, pba);
    - rlun = rrpc_ppa_to_lun(rrpc, gaddr);
    - if (!rlun) {
    - pr_err("rrpc: l2p corruption on lba %llu\n",
    - slba + i);
    - return -EINVAL;
    - }
    -
    - rblk = &rlun->blocks[gaddr.g.blk];
    - if (!rblk->state) {
    - /* at this point, we don't know anything about the
    - * block. It's up to the FTL on top to re-etablish the
    - * block state. The block is assumed to be open.
    - */
    - list_move_tail(&rblk->list, &rlun->used_list);
    - rblk->state = NVM_BLK_ST_TGT;
    - rlun->nr_free_blocks--;
    - }
    -
    - addr[i].addr = pba;
    - addr[i].rblk = rblk;
    - raddr[mod].addr = slba + i;
    - }
    -
    - return 0;
    -}
    -
    -static int rrpc_map_init(struct rrpc *rrpc)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - sector_t i;
    - int ret;
    -
    - rrpc->trans_map = vzalloc(sizeof(struct rrpc_addr) * rrpc->nr_sects);
    - if (!rrpc->trans_map)
    - return -ENOMEM;
    -
    - rrpc->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr)
    - * rrpc->nr_sects);
    - if (!rrpc->rev_trans_map)
    - return -ENOMEM;
    -
    - for (i = 0; i < rrpc->nr_sects; i++) {
    - struct rrpc_addr *p = &rrpc->trans_map[i];
    - struct rrpc_rev_addr *r = &rrpc->rev_trans_map[i];
    -
    - p->addr = ADDR_EMPTY;
    - r->addr = ADDR_EMPTY;
    - }
    -
    - /* Bring up the mapping table from device */
    - ret = nvm_get_l2p_tbl(dev, rrpc->soffset, rrpc->nr_sects,
    - rrpc_l2p_update, rrpc);
    - if (ret) {
    - pr_err("nvm: rrpc: could not read L2P table.\n");
    - return -EINVAL;
    - }
    -
    - return 0;
    -}
    -
    -/* Minimum pages needed within a lun */
    -#define PAGE_POOL_SIZE 16
    -#define ADDR_POOL_SIZE 64
    -
    -static int rrpc_core_init(struct rrpc *rrpc)
    -{
    - down_write(&rrpc_lock);
    - if (!rrpc_gcb_cache) {
    - rrpc_gcb_cache = kmem_cache_create("rrpc_gcb",
    - sizeof(struct rrpc_block_gc), 0, 0, NULL);
    - if (!rrpc_gcb_cache) {
    - up_write(&rrpc_lock);
    - return -ENOMEM;
    - }
    -
    - rrpc_rq_cache = kmem_cache_create("rrpc_rq",
    - sizeof(struct nvm_rq) + sizeof(struct rrpc_rq),
    - 0, 0, NULL);
    - if (!rrpc_rq_cache) {
    - kmem_cache_destroy(rrpc_gcb_cache);
    - up_write(&rrpc_lock);
    - return -ENOMEM;
    - }
    - }
    - up_write(&rrpc_lock);
    -
    - rrpc->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0);
    - if (!rrpc->page_pool)
    - return -ENOMEM;
    -
    - rrpc->gcb_pool = mempool_create_slab_pool(rrpc->dev->geo.nr_luns,
    - rrpc_gcb_cache);
    - if (!rrpc->gcb_pool)
    - return -ENOMEM;
    -
    - rrpc->rq_pool = mempool_create_slab_pool(64, rrpc_rq_cache);
    - if (!rrpc->rq_pool)
    - return -ENOMEM;
    -
    - spin_lock_init(&rrpc->inflights.lock);
    - INIT_LIST_HEAD(&rrpc->inflights.reqs);
    -
    - return 0;
    -}
    -
    -static void rrpc_core_free(struct rrpc *rrpc)
    -{
    - mempool_destroy(rrpc->page_pool);
    - mempool_destroy(rrpc->gcb_pool);
    - mempool_destroy(rrpc->rq_pool);
    -}
    -
    -static void rrpc_luns_free(struct rrpc *rrpc)
    -{
    - struct rrpc_lun *rlun;
    - int i;
    -
    - if (!rrpc->luns)
    - return;
    -
    - for (i = 0; i < rrpc->nr_luns; i++) {
    - rlun = &rrpc->luns[i];
    - vfree(rlun->blocks);
    - }
    -
    - kfree(rrpc->luns);
    -}
    -
    -static int rrpc_bb_discovery(struct nvm_tgt_dev *dev, struct rrpc_lun *rlun)
    -{
    - struct nvm_geo *geo = &dev->geo;
    - struct rrpc_block *rblk;
    - struct ppa_addr ppa;
    - u8 *blks;
    - int nr_blks;
    - int i;
    - int ret;
    -
    - if (!dev->parent->ops->get_bb_tbl)
    - return 0;
    -
    - nr_blks = geo->blks_per_lun * geo->plane_mode;
    - blks = kmalloc(nr_blks, GFP_KERNEL);
    - if (!blks)
    - return -ENOMEM;
    -
    - ppa.ppa = 0;
    - ppa.g.ch = rlun->bppa.g.ch;
    - ppa.g.lun = rlun->bppa.g.lun;
    -
    - ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
    - if (ret) {
    - pr_err("rrpc: could not get BB table\n");
    - goto out;
    - }
    -
    - nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
    - if (nr_blks < 0) {
    - ret = nr_blks;
    - goto out;
    - }
    -
    - for (i = 0; i < nr_blks; i++) {
    - if (blks[i] == NVM_BLK_T_FREE)
    - continue;
    -
    - rblk = &rlun->blocks[i];
    - list_move_tail(&rblk->list, &rlun->bb_list);
    - rblk->state = NVM_BLK_ST_BAD;
    - rlun->nr_free_blocks--;
    - }
    -
    -out:
    - kfree(blks);
    - return ret;
    -}
    -
    -static void rrpc_set_lun_ppa(struct rrpc_lun *rlun, struct ppa_addr ppa)
    -{
    - rlun->bppa.ppa = 0;
    - rlun->bppa.g.ch = ppa.g.ch;
    - rlun->bppa.g.lun = ppa.g.lun;
    -}
    -
    -static int rrpc_luns_init(struct rrpc *rrpc, struct ppa_addr *luns)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct nvm_geo *geo = &dev->geo;
    - struct rrpc_lun *rlun;
    - int i, j, ret = -EINVAL;
    -
    - if (geo->sec_per_blk > MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
    - pr_err("rrpc: number of pages per block too high.");
    - return -EINVAL;
    - }
    -
    - spin_lock_init(&rrpc->rev_lock);
    -
    - rrpc->luns = kcalloc(rrpc->nr_luns, sizeof(struct rrpc_lun),
    - GFP_KERNEL);
    - if (!rrpc->luns)
    - return -ENOMEM;
    -
    - /* 1:1 mapping */
    - for (i = 0; i < rrpc->nr_luns; i++) {
    - rlun = &rrpc->luns[i];
    - rlun->id = i;
    - rrpc_set_lun_ppa(rlun, luns[i]);
    - rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
    - geo->blks_per_lun);
    - if (!rlun->blocks) {
    - ret = -ENOMEM;
    - goto err;
    - }
    -
    - INIT_LIST_HEAD(&rlun->free_list);
    - INIT_LIST_HEAD(&rlun->used_list);
    - INIT_LIST_HEAD(&rlun->bb_list);
    -
    - for (j = 0; j < geo->blks_per_lun; j++) {
    - struct rrpc_block *rblk = &rlun->blocks[j];
    -
    - rblk->id = j;
    - rblk->rlun = rlun;
    - rblk->state = NVM_BLK_T_FREE;
    - INIT_LIST_HEAD(&rblk->prio);
    - INIT_LIST_HEAD(&rblk->list);
    - spin_lock_init(&rblk->lock);
    -
    - list_add_tail(&rblk->list, &rlun->free_list);
    - }
    -
    - rlun->rrpc = rrpc;
    - rlun->nr_free_blocks = geo->blks_per_lun;
    - rlun->reserved_blocks = 2; /* for GC only */
    -
    - INIT_LIST_HEAD(&rlun->prio_list);
    - INIT_LIST_HEAD(&rlun->wblk_list);
    -
    - INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
    - spin_lock_init(&rlun->lock);
    -
    - if (rrpc_bb_discovery(dev, rlun))
    - goto err;
    -
    - }
    -
    - return 0;
    -err:
    - return ret;
    -}
    -
    -/* returns 0 on success and stores the beginning address in *begin */
    -static int rrpc_area_init(struct rrpc *rrpc, sector_t *begin)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - sector_t size = rrpc->nr_sects * dev->geo.sec_size;
    - int ret;
    -
    - size >>= 9;
    -
    - ret = nvm_get_area(dev, begin, size);
    - if (!ret)
    - *begin >>= (ilog2(dev->geo.sec_size) - 9);
    -
    - return ret;
    -}
    -
    -static void rrpc_area_free(struct rrpc *rrpc)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - sector_t begin = rrpc->soffset << (ilog2(dev->geo.sec_size) - 9);
    -
    - nvm_put_area(dev, begin);
    -}
    -
    -static void rrpc_free(struct rrpc *rrpc)
    -{
    - rrpc_gc_free(rrpc);
    - rrpc_map_free(rrpc);
    - rrpc_core_free(rrpc);
    - rrpc_luns_free(rrpc);
    - rrpc_area_free(rrpc);
    -
    - kfree(rrpc);
    -}
    -
    -static void rrpc_exit(void *private)
    -{
    - struct rrpc *rrpc = private;
    -
    - del_timer(&rrpc->gc_timer);
    -
    - flush_workqueue(rrpc->krqd_wq);
    - flush_workqueue(rrpc->kgc_wq);
    -
    - rrpc_free(rrpc);
    -}
    -
    -static sector_t rrpc_capacity(void *private)
    -{
    - struct rrpc *rrpc = private;
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - sector_t reserved, provisioned;
    -
    - /* cur, gc, and two emergency blocks for each lun */
    - reserved = rrpc->nr_luns * dev->geo.sec_per_blk * 4;
    - provisioned = rrpc->nr_sects - reserved;
    -
    - if (reserved > rrpc->nr_sects) {
    - pr_err("rrpc: not enough space available to expose storage.\n");
    - return 0;
    - }
    -
    - sector_div(provisioned, 10);
    - return provisioned * 9 * NR_PHY_IN_LOG;
    -}
    -
    -/*
    - * Looks up the logical address from reverse trans map and check if its valid by
    - * comparing the logical to physical address with the physical address.
    - * Returns 0 on free, otherwise 1 if in use
    - */
    -static void rrpc_block_map_update(struct rrpc *rrpc, struct rrpc_block *rblk)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - int offset;
    - struct rrpc_addr *laddr;
    - u64 bpaddr, paddr, pladdr;
    -
    - bpaddr = block_to_rel_addr(rrpc, rblk);
    - for (offset = 0; offset < dev->geo.sec_per_blk; offset++) {
    - paddr = bpaddr + offset;
    -
    - pladdr = rrpc->rev_trans_map[paddr].addr;
    - if (pladdr == ADDR_EMPTY)
    - continue;
    -
    - laddr = &rrpc->trans_map[pladdr];
    -
    - if (paddr == laddr->addr) {
    - laddr->rblk = rblk;
    - } else {
    - set_bit(offset, rblk->invalid_pages);
    - rblk->nr_invalid_pages++;
    - }
    - }
    -}
    -
    -static int rrpc_blocks_init(struct rrpc *rrpc)
    -{
    - struct nvm_tgt_dev *dev = rrpc->dev;
    - struct rrpc_lun *rlun;
    - struct rrpc_block *rblk;
    - int lun_iter, blk_iter;
    -
    - for (lun_iter = 0; lun_iter < rrpc->nr_luns; lun_iter++) {
    - rlun = &rrpc->luns[lun_iter];
    -
    - for (blk_iter = 0; blk_iter < dev->geo.blks_per_lun;
    - blk_iter++) {
    - rblk = &rlun->blocks[blk_iter];
    - rrpc_block_map_update(rrpc, rblk);
    - }
    - }
    -
    - return 0;
    -}
    -
    -static int rrpc_luns_configure(struct rrpc *rrpc)
    -{
    - struct rrpc_lun *rlun;
    - struct rrpc_block *rblk;
    - int i;
    -
    - for (i = 0; i < rrpc->nr_luns; i++) {
    - rlun = &rrpc->luns[i];
    -
    - rblk = rrpc_get_blk(rrpc, rlun, 0);
    - if (!rblk)
    - goto err;
    - rrpc_set_lun_cur(rlun, rblk, &rlun->cur);
    -
    - /* Emergency gc block */
    - rblk = rrpc_get_blk(rrpc, rlun, 1);
    - if (!rblk)
    - goto err;
    - rrpc_set_lun_cur(rlun, rblk, &rlun->gc_cur);
    - }
    -
    - return 0;
    -err:
    - rrpc_put_blks(rrpc);
    - return -EINVAL;
    -}
    -
    -static struct nvm_tgt_type tt_rrpc;
    -
    -static void *rrpc_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
    - int flags)
    -{
    - struct request_queue *bqueue = dev->q;
    - struct request_queue *tqueue = tdisk->queue;
    - struct nvm_geo *geo = &dev->geo;
    - struct rrpc *rrpc;
    - sector_t soffset;
    - int ret;
    -
    - if (!(dev->identity.dom & NVM_RSP_L2P)) {
    - pr_err("nvm: rrpc: device does not support l2p (%x)\n",
    - dev->identity.dom);
    - return ERR_PTR(-EINVAL);
    - }
    -
    - rrpc = kzalloc(sizeof(struct rrpc), GFP_KERNEL);
    - if (!rrpc)
    - return ERR_PTR(-ENOMEM);
    -
    - rrpc->dev = dev;
    - rrpc->disk = tdisk;
    -
    - bio_list_init(&rrpc->requeue_bios);
    - spin_lock_init(&rrpc->bio_lock);
    - INIT_WORK(&rrpc->ws_requeue, rrpc_requeue);
    -
    - rrpc->nr_luns = geo->nr_luns;
    - rrpc->nr_sects = (unsigned long long)geo->sec_per_lun * rrpc->nr_luns;
    -
    - /* simple round-robin strategy */
    - atomic_set(&rrpc->next_lun, -1);
    -
    - ret = rrpc_area_init(rrpc, &soffset);
    - if (ret < 0) {
    - pr_err("nvm: rrpc: could not initialize area\n");
    - return ERR_PTR(ret);
    - }
    - rrpc->soffset = soffset;
    -
    - ret = rrpc_luns_init(rrpc, dev->luns);
    - if (ret) {
    - pr_err("nvm: rrpc: could not initialize luns\n");
    - goto err;
    - }
    -
    - ret = rrpc_core_init(rrpc);
    - if (ret) {
    - pr_err("nvm: rrpc: could not initialize core\n");
    - goto err;
    - }
    -
    - ret = rrpc_map_init(rrpc);
    - if (ret) {
    - pr_err("nvm: rrpc: could not initialize maps\n");
    - goto err;
    - }
    -
    - ret = rrpc_blocks_init(rrpc);
    - if (ret) {
    - pr_err("nvm: rrpc: could not initialize state for blocks\n");
    - goto err;
    - }
    -
    - ret = rrpc_luns_configure(rrpc);
    - if (ret) {
    - pr_err("nvm: rrpc: not enough blocks available in LUNs.\n");
    - goto err;
    - }
    -
    - ret = rrpc_gc_init(rrpc);
    - if (ret) {
    - pr_err("nvm: rrpc: could not initialize gc\n");
    - goto err;
    - }
    -
    - /* inherit the size from the underlying device */
    - blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
    - blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
    -
    - pr_info("nvm: rrpc initialized with %u luns and %llu pages.\n",
    - rrpc->nr_luns, (unsigned long long)rrpc->nr_sects);
    -
    - mod_timer(&rrpc->gc_timer, jiffies + msecs_to_jiffies(10));
    -
    - return rrpc;
    -err:
    - rrpc_free(rrpc);
    - return ERR_PTR(ret);
    -}
    -
    -/* round robin, page-based FTL, and cost-based GC */
    -static struct nvm_tgt_type tt_rrpc = {
    - .name = "rrpc",
    - .version = {1, 0, 0},
    -
    - .make_rq = rrpc_make_rq,
    - .capacity = rrpc_capacity,
    -
    - .init = rrpc_init,
    - .exit = rrpc_exit,
    -};
    -
    -static int __init rrpc_module_init(void)
    -{
    - return nvm_register_tgt_type(&tt_rrpc);
    -}
    -
    -static void rrpc_module_exit(void)
    -{
    - nvm_unregister_tgt_type(&tt_rrpc);
    -}
    -
    -module_init(rrpc_module_init);
    -module_exit(rrpc_module_exit);
    -MODULE_LICENSE("GPL v2");
    -MODULE_DESCRIPTION("Block-Device Target for Open-Channel SSDs");
    diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h
    deleted file mode 100644
    index fdb6ff9..0000000
    --- a/drivers/lightnvm/rrpc.h
    +++ /dev/null
    @@ -1,290 +0,0 @@
    -/*
    - * 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_ */
    --
    2.9.3
    \
     
     \ /
      Last update: 2018-01-05 14:21    [W:4.930 / U:0.320 seconds]
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