pblk-core.c 45.8 KB
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/*
 * Copyright (C) 2016 CNEX Labs
 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
 *                  Matias Bjorling <matias@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.
 *
 * pblk-core.c - pblk's core functionality
 *
 */

#include "pblk.h"

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static void pblk_line_mark_bb(struct work_struct *work)
{
	struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
									ws);
	struct pblk *pblk = line_ws->pblk;
	struct nvm_tgt_dev *dev = pblk->dev;
	struct ppa_addr *ppa = line_ws->priv;
	int ret;

	ret = nvm_set_tgt_bb_tbl(dev, ppa, 1, NVM_BLK_T_GRWN_BAD);
	if (ret) {
		struct pblk_line *line;
		int pos;

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		line = &pblk->lines[pblk_ppa_to_line(*ppa)];
		pos = pblk_ppa_to_pos(&dev->geo, *ppa);
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		pr_err("pblk: failed to mark bb, line:%d, pos:%d\n",
				line->id, pos);
	}

	kfree(ppa);
	mempool_free(line_ws, pblk->gen_ws_pool);
}

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static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
			 struct ppa_addr *ppa)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
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	int pos = pblk_ppa_to_pos(geo, *ppa);
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	pr_debug("pblk: erase failed: line:%d, pos:%d\n", line->id, pos);
	atomic_long_inc(&pblk->erase_failed);

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	atomic_dec(&line->blk_in_line);
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	if (test_and_set_bit(pos, line->blk_bitmap))
		pr_err("pblk: attempted to erase bb: line:%d, pos:%d\n",
							line->id, pos);

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	pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb,
						GFP_ATOMIC, pblk->bb_wq);
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}

static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
{
	struct pblk_line *line;

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	line = &pblk->lines[pblk_ppa_to_line(rqd->ppa_addr)];
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	atomic_dec(&line->left_seblks);

	if (rqd->error) {
		struct ppa_addr *ppa;

		ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
		if (!ppa)
			return;

		*ppa = rqd->ppa_addr;
		pblk_mark_bb(pblk, line, ppa);
	}
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	atomic_dec(&pblk->inflight_io);
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}

/* Erase completion assumes that only one block is erased at the time */
static void pblk_end_io_erase(struct nvm_rq *rqd)
{
	struct pblk *pblk = rqd->private;

	__pblk_end_io_erase(pblk, rqd);
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	mempool_free(rqd, pblk->e_rq_pool);
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}

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void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
			   u64 paddr)
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{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct list_head *move_list = NULL;

	/* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P
	 * table is modified with reclaimed sectors, a check is done to endure
	 * that newer updates are not overwritten.
	 */
	spin_lock(&line->lock);
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	WARN_ON(line->state == PBLK_LINESTATE_FREE);
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	if (test_and_set_bit(paddr, line->invalid_bitmap)) {
		WARN_ONCE(1, "pblk: double invalidate\n");
		spin_unlock(&line->lock);
		return;
	}
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	le32_add_cpu(line->vsc, -1);
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	if (line->state == PBLK_LINESTATE_CLOSED)
		move_list = pblk_line_gc_list(pblk, line);
	spin_unlock(&line->lock);

	if (move_list) {
		spin_lock(&l_mg->gc_lock);
		spin_lock(&line->lock);
		/* Prevent moving a line that has just been chosen for GC */
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		if (line->state == PBLK_LINESTATE_GC) {
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			spin_unlock(&line->lock);
			spin_unlock(&l_mg->gc_lock);
			return;
		}
		spin_unlock(&line->lock);

		list_move_tail(&line->list, move_list);
		spin_unlock(&l_mg->gc_lock);
	}
}

void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
{
	struct pblk_line *line;
	u64 paddr;
	int line_id;

#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a device address */
	BUG_ON(pblk_addr_in_cache(ppa));
	BUG_ON(pblk_ppa_empty(ppa));
#endif

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	line_id = pblk_ppa_to_line(ppa);
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	line = &pblk->lines[line_id];
	paddr = pblk_dev_ppa_to_line_addr(pblk, ppa);

	__pblk_map_invalidate(pblk, line, paddr);
}

static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
				  unsigned int nr_secs)
{
	sector_t lba;

	spin_lock(&pblk->trans_lock);
	for (lba = slba; lba < slba + nr_secs; lba++) {
		struct ppa_addr ppa;

		ppa = pblk_trans_map_get(pblk, lba);

		if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa))
			pblk_map_invalidate(pblk, ppa);

		pblk_ppa_set_empty(&ppa);
		pblk_trans_map_set(pblk, lba, ppa);
	}
	spin_unlock(&pblk->trans_lock);
}

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/* Caller must guarantee that the request is a valid type */
struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type)
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{
	mempool_t *pool;
	struct nvm_rq *rqd;
	int rq_size;

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	switch (type) {
	case PBLK_WRITE:
	case PBLK_WRITE_INT:
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		pool = pblk->w_rq_pool;
		rq_size = pblk_w_rq_size;
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		break;
	case PBLK_READ:
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		pool = pblk->r_rq_pool;
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		rq_size = pblk_g_rq_size;
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		break;
	default:
		pool = pblk->e_rq_pool;
		rq_size = pblk_g_rq_size;
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	}

	rqd = mempool_alloc(pool, GFP_KERNEL);
	memset(rqd, 0, rq_size);

	return rqd;
}

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/* Typically used on completion path. Cannot guarantee request consistency */
void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
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{
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	struct nvm_tgt_dev *dev = pblk->dev;
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	mempool_t *pool;

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	switch (type) {
	case PBLK_WRITE:
		kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap);
	case PBLK_WRITE_INT:
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		pool = pblk->w_rq_pool;
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		break;
	case PBLK_READ:
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		pool = pblk->r_rq_pool;
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		break;
	case PBLK_ERASE:
		pool = pblk->e_rq_pool;
		break;
	default:
		pr_err("pblk: trying to free unknown rqd type\n");
		return;
	}
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	nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
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	mempool_free(rqd, pool);
}

void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
			 int nr_pages)
{
	struct bio_vec bv;
	int i;

	WARN_ON(off + nr_pages != bio->bi_vcnt);

	for (i = off; i < nr_pages + off; i++) {
		bv = bio->bi_io_vec[i];
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		mempool_free(bv.bv_page, pblk->page_bio_pool);
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	}
}

int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
		       int nr_pages)
{
	struct request_queue *q = pblk->dev->q;
	struct page *page;
	int i, ret;

	for (i = 0; i < nr_pages; i++) {
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		page = mempool_alloc(pblk->page_bio_pool, flags);
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		ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
		if (ret != PBLK_EXPOSED_PAGE_SIZE) {
			pr_err("pblk: could not add page to bio\n");
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			mempool_free(page, pblk->page_bio_pool);
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			goto err;
		}
	}

	return 0;
err:
	pblk_bio_free_pages(pblk, bio, 0, i - 1);
	return -1;
}

static void pblk_write_kick(struct pblk *pblk)
{
	wake_up_process(pblk->writer_ts);
	mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000));
}

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void pblk_write_timer_fn(struct timer_list *t)
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{
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	struct pblk *pblk = from_timer(pblk, t, wtimer);
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	/* kick the write thread every tick to flush outstanding data */
	pblk_write_kick(pblk);
}

void pblk_write_should_kick(struct pblk *pblk)
{
	unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb);

	if (secs_avail >= pblk->min_write_pgs)
		pblk_write_kick(pblk);
}

void pblk_end_io_sync(struct nvm_rq *rqd)
{
	struct completion *waiting = rqd->private;

	complete(waiting);
}

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static void pblk_wait_for_meta(struct pblk *pblk)
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{
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	do {
		if (!atomic_read(&pblk->inflight_io))
			break;
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		schedule();
	} while (1);
}
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static void pblk_flush_writer(struct pblk *pblk)
{
	pblk_rb_flush(&pblk->rwb);
	do {
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		if (!pblk_rb_sync_count(&pblk->rwb))
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			break;
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		pblk_write_kick(pblk);
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		schedule();
	} while (1);
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}

struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct list_head *move_list = NULL;
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	int vsc = le32_to_cpu(*line->vsc);
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	lockdep_assert_held(&line->lock);

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	if (!vsc) {
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		if (line->gc_group != PBLK_LINEGC_FULL) {
			line->gc_group = PBLK_LINEGC_FULL;
			move_list = &l_mg->gc_full_list;
		}
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	} else if (vsc < lm->high_thrs) {
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		if (line->gc_group != PBLK_LINEGC_HIGH) {
			line->gc_group = PBLK_LINEGC_HIGH;
			move_list = &l_mg->gc_high_list;
		}
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	} else if (vsc < lm->mid_thrs) {
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		if (line->gc_group != PBLK_LINEGC_MID) {
			line->gc_group = PBLK_LINEGC_MID;
			move_list = &l_mg->gc_mid_list;
		}
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	} else if (vsc < line->sec_in_line) {
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		if (line->gc_group != PBLK_LINEGC_LOW) {
			line->gc_group = PBLK_LINEGC_LOW;
			move_list = &l_mg->gc_low_list;
		}
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	} else if (vsc == line->sec_in_line) {
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		if (line->gc_group != PBLK_LINEGC_EMPTY) {
			line->gc_group = PBLK_LINEGC_EMPTY;
			move_list = &l_mg->gc_empty_list;
		}
	} else {
		line->state = PBLK_LINESTATE_CORRUPT;
		line->gc_group = PBLK_LINEGC_NONE;
		move_list =  &l_mg->corrupt_list;
		pr_err("pblk: corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n",
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						line->id, vsc,
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						line->sec_in_line,
						lm->high_thrs, lm->mid_thrs);
	}

	return move_list;
}

void pblk_discard(struct pblk *pblk, struct bio *bio)
{
	sector_t slba = pblk_get_lba(bio);
	sector_t nr_secs = pblk_get_secs(bio);

	pblk_invalidate_range(pblk, slba, nr_secs);
}

void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd)
{
	atomic_long_inc(&pblk->write_failed);
#ifdef CONFIG_NVM_DEBUG
	pblk_print_failed_rqd(pblk, rqd, rqd->error);
#endif
}

void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
{
	/* Empty page read is not necessarily an error (e.g., L2P recovery) */
	if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
		atomic_long_inc(&pblk->read_empty);
		return;
	}

	switch (rqd->error) {
	case NVM_RSP_WARN_HIGHECC:
		atomic_long_inc(&pblk->read_high_ecc);
		break;
	case NVM_RSP_ERR_FAILECC:
	case NVM_RSP_ERR_FAILCRC:
		atomic_long_inc(&pblk->read_failed);
		break;
	default:
		pr_err("pblk: unknown read error:%d\n", rqd->error);
	}
#ifdef CONFIG_NVM_DEBUG
	pblk_print_failed_rqd(pblk, rqd, rqd->error);
#endif
}

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void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
{
	pblk->sec_per_write = sec_per_write;
}

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int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
{
	struct nvm_tgt_dev *dev = pblk->dev;

#ifdef CONFIG_NVM_DEBUG
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	int ret;
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	ret = pblk_check_io(pblk, rqd);
	if (ret)
		return ret;
#endif
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	atomic_inc(&pblk->inflight_io);
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	return nvm_submit_io(dev, rqd);
}
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int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
{
	struct nvm_tgt_dev *dev = pblk->dev;

#ifdef CONFIG_NVM_DEBUG
	int ret;

	ret = pblk_check_io(pblk, rqd);
	if (ret)
		return ret;
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#endif
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	atomic_inc(&pblk->inflight_io);

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	return nvm_submit_io_sync(dev, rqd);
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}

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static void pblk_bio_map_addr_endio(struct bio *bio)
{
	bio_put(bio);
}

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struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
			      unsigned int nr_secs, unsigned int len,
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			      int alloc_type, gfp_t gfp_mask)
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{
	struct nvm_tgt_dev *dev = pblk->dev;
	void *kaddr = data;
	struct page *page;
	struct bio *bio;
	int i, ret;

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	if (alloc_type == PBLK_KMALLOC_META)
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		return bio_map_kern(dev->q, kaddr, len, gfp_mask);

	bio = bio_kmalloc(gfp_mask, nr_secs);
	if (!bio)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < nr_secs; i++) {
		page = vmalloc_to_page(kaddr);
		if (!page) {
			pr_err("pblk: could not map vmalloc bio\n");
			bio_put(bio);
			bio = ERR_PTR(-ENOMEM);
			goto out;
		}

		ret = bio_add_pc_page(dev->q, bio, page, PAGE_SIZE, 0);
		if (ret != PAGE_SIZE) {
			pr_err("pblk: could not add page to bio\n");
			bio_put(bio);
			bio = ERR_PTR(-ENOMEM);
			goto out;
		}

		kaddr += PAGE_SIZE;
	}
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	bio->bi_end_io = pblk_bio_map_addr_endio;
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out:
	return bio;
}

int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
		   unsigned long secs_to_flush)
{
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	int max = pblk->sec_per_write;
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	int min = pblk->min_write_pgs;
	int secs_to_sync = 0;

	if (secs_avail >= max)
		secs_to_sync = max;
	else if (secs_avail >= min)
		secs_to_sync = min * (secs_avail / min);
	else if (secs_to_flush)
		secs_to_sync = min;

	return secs_to_sync;
}

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void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
{
	u64 addr;
	int i;

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	spin_lock(&line->lock);
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	addr = find_next_zero_bit(line->map_bitmap,
					pblk->lm.sec_per_line, line->cur_sec);
	line->cur_sec = addr - nr_secs;

	for (i = 0; i < nr_secs; i++, line->cur_sec--)
		WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
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	spin_unlock(&line->lock);
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}

u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
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{
	u64 addr;
	int i;

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	lockdep_assert_held(&line->lock);

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	/* logic error: ppa out-of-bounds. Prevent generating bad address */
	if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) {
		WARN(1, "pblk: page allocation out of bounds\n");
		nr_secs = pblk->lm.sec_per_line - line->cur_sec;
	}

	line->cur_sec = addr = find_next_zero_bit(line->map_bitmap,
					pblk->lm.sec_per_line, line->cur_sec);
	for (i = 0; i < nr_secs; i++, line->cur_sec++)
		WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap));

	return addr;
}

u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
{
	u64 addr;

	/* Lock needed in case a write fails and a recovery needs to remap
	 * failed write buffer entries
	 */
	spin_lock(&line->lock);
	addr = __pblk_alloc_page(pblk, line, nr_secs);
	line->left_msecs -= nr_secs;
	WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n");
	spin_unlock(&line->lock);

	return addr;
}

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u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line)
{
	u64 paddr;

	spin_lock(&line->lock);
	paddr = find_next_zero_bit(line->map_bitmap,
					pblk->lm.sec_per_line, line->cur_sec);
	spin_unlock(&line->lock);

	return paddr;
}

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/*
 * Submit emeta to one LUN in the raid line at the time to avoid a deadlock when
 * taking the per LUN semaphore.
 */
static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
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				     void *emeta_buf, u64 paddr, int dir)
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{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
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	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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	struct pblk_line_meta *lm = &pblk->lm;
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	void *ppa_list, *meta_list;
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	struct bio *bio;
	struct nvm_rq rqd;
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	dma_addr_t dma_ppa_list, dma_meta_list;
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	int min = pblk->min_write_pgs;
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	int left_ppas = lm->emeta_sec[0];
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	int id = line->id;
	int rq_ppas, rq_len;
	int cmd_op, bio_op;
	int i, j;
	int ret;

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	if (dir == PBLK_WRITE) {
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		bio_op = REQ_OP_WRITE;
		cmd_op = NVM_OP_PWRITE;
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	} else if (dir == PBLK_READ) {
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		bio_op = REQ_OP_READ;
		cmd_op = NVM_OP_PREAD;
	} else
		return -EINVAL;

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	meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
							&dma_meta_list);
	if (!meta_list)
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		return -ENOMEM;

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	ppa_list = meta_list + pblk_dma_meta_size;
	dma_ppa_list = dma_meta_list + pblk_dma_meta_size;

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next_rq:
	memset(&rqd, 0, sizeof(struct nvm_rq));

	rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
	rq_len = rq_ppas * geo->sec_size;

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	bio = pblk_bio_map_addr(pblk, emeta_buf, rq_ppas, rq_len,
					l_mg->emeta_alloc_type, GFP_KERNEL);
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	if (IS_ERR(bio)) {
		ret = PTR_ERR(bio);
		goto free_rqd_dma;
	}

	bio->bi_iter.bi_sector = 0; /* internal bio */
	bio_set_op_attrs(bio, bio_op, 0);

	rqd.bio = bio;
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	rqd.meta_list = meta_list;
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	rqd.ppa_list = ppa_list;
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	rqd.dma_meta_list = dma_meta_list;
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	rqd.dma_ppa_list = dma_ppa_list;
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	rqd.opcode = cmd_op;
	rqd.nr_ppas = rq_ppas;
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	if (dir == PBLK_WRITE) {
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		struct pblk_sec_meta *meta_list = rqd.meta_list;

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		rqd.flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
640 641 642 643
		for (i = 0; i < rqd.nr_ppas; ) {
			spin_lock(&line->lock);
			paddr = __pblk_alloc_page(pblk, line, min);
			spin_unlock(&line->lock);
644 645
			for (j = 0; j < min; j++, i++, paddr++) {
				meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
646 647
				rqd.ppa_list[i] =
					addr_to_gen_ppa(pblk, paddr, id);
648
			}
649 650 651 652
		}
	} else {
		for (i = 0; i < rqd.nr_ppas; ) {
			struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, id);
653
			int pos = pblk_ppa_to_pos(geo, ppa);
654 655 656 657 658
			int read_type = PBLK_READ_RANDOM;

			if (pblk_io_aligned(pblk, rq_ppas))
				read_type = PBLK_READ_SEQUENTIAL;
			rqd.flags = pblk_set_read_mode(pblk, read_type);
659 660 661 662 663 664 665 666 667 668 669 670

			while (test_bit(pos, line->blk_bitmap)) {
				paddr += min;
				if (pblk_boundary_paddr_checks(pblk, paddr)) {
					pr_err("pblk: corrupt emeta line:%d\n",
								line->id);
					bio_put(bio);
					ret = -EINTR;
					goto free_rqd_dma;
				}

				ppa = addr_to_gen_ppa(pblk, paddr, id);
671
				pos = pblk_ppa_to_pos(geo, ppa);
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
			}

			if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
				pr_err("pblk: corrupt emeta line:%d\n",
								line->id);
				bio_put(bio);
				ret = -EINTR;
				goto free_rqd_dma;
			}

			for (j = 0; j < min; j++, i++, paddr++)
				rqd.ppa_list[i] =
					addr_to_gen_ppa(pblk, paddr, line->id);
		}
	}

688
	ret = pblk_submit_io_sync(pblk, &rqd);
689 690 691 692 693 694
	if (ret) {
		pr_err("pblk: emeta I/O submission failed: %d\n", ret);
		bio_put(bio);
		goto free_rqd_dma;
	}

695
	atomic_dec(&pblk->inflight_io);
696 697

	if (rqd.error) {
698
		if (dir == PBLK_WRITE)
699 700 701 702 703
			pblk_log_write_err(pblk, &rqd);
		else
			pblk_log_read_err(pblk, &rqd);
	}

704
	emeta_buf += rq_len;
705 706 707 708
	left_ppas -= rq_ppas;
	if (left_ppas)
		goto next_rq;
free_rqd_dma:
709
	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
	return ret;
}

u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	int bit;

	/* This usually only happens on bad lines */
	bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
	if (bit >= lm->blk_per_line)
		return -1;

	return bit * geo->sec_per_pl;
}

static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line,
				     u64 paddr, int dir)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct pblk_line_meta *lm = &pblk->lm;
	struct bio *bio;
	struct nvm_rq rqd;
	__le64 *lba_list = NULL;
	int i, ret;
	int cmd_op, bio_op;
	int flags;

740
	if (dir == PBLK_WRITE) {
741 742
		bio_op = REQ_OP_WRITE;
		cmd_op = NVM_OP_PWRITE;
743
		flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
744
		lba_list = emeta_to_lbas(pblk, line->emeta->buf);
745
	} else if (dir == PBLK_READ_RECOV || dir == PBLK_READ) {
746 747
		bio_op = REQ_OP_READ;
		cmd_op = NVM_OP_PREAD;
748
		flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
749 750 751 752 753
	} else
		return -EINVAL;

	memset(&rqd, 0, sizeof(struct nvm_rq));

754 755 756
	rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
							&rqd.dma_meta_list);
	if (!rqd.meta_list)
757 758
		return -ENOMEM;

759 760 761
	rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
	rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;

762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
	bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
	if (IS_ERR(bio)) {
		ret = PTR_ERR(bio);
		goto free_ppa_list;
	}

	bio->bi_iter.bi_sector = 0; /* internal bio */
	bio_set_op_attrs(bio, bio_op, 0);

	rqd.bio = bio;
	rqd.opcode = cmd_op;
	rqd.flags = flags;
	rqd.nr_ppas = lm->smeta_sec;

	for (i = 0; i < lm->smeta_sec; i++, paddr++) {
777 778
		struct pblk_sec_meta *meta_list = rqd.meta_list;

779
		rqd.ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
780

781
		if (dir == PBLK_WRITE) {
782
			__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
783 784 785

			meta_list[i].lba = lba_list[paddr] = addr_empty;
		}
786 787 788 789 790 791 792
	}

	/*
	 * This I/O is sent by the write thread when a line is replace. Since
	 * the write thread is the only one sending write and erase commands,
	 * there is no need to take the LUN semaphore.
	 */
793
	ret = pblk_submit_io_sync(pblk, &rqd);
794 795 796 797 798 799
	if (ret) {
		pr_err("pblk: smeta I/O submission failed: %d\n", ret);
		bio_put(bio);
		goto free_ppa_list;
	}

800
	atomic_dec(&pblk->inflight_io);
801 802

	if (rqd.error) {
803
		if (dir == PBLK_WRITE)
804
			pblk_log_write_err(pblk, &rqd);
805
		else if (dir == PBLK_READ)
806 807 808 809
			pblk_log_read_err(pblk, &rqd);
	}

free_ppa_list:
810
	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
811 812 813 814 815 816 817 818

	return ret;
}

int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line)
{
	u64 bpaddr = pblk_line_smeta_start(pblk, line);

819
	return pblk_line_submit_smeta_io(pblk, line, bpaddr, PBLK_READ_RECOV);
820 821
}

822 823
int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line,
			 void *emeta_buf)
824
{
825
	return pblk_line_submit_emeta_io(pblk, line, emeta_buf,
826
						line->emeta_ssec, PBLK_READ);
827 828 829 830 831 832 833 834
}

static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd,
			    struct ppa_addr ppa)
{
	rqd->opcode = NVM_OP_ERASE;
	rqd->ppa_addr = ppa;
	rqd->nr_ppas = 1;
835
	rqd->flags = pblk_set_progr_mode(pblk, PBLK_ERASE);
836 837 838 839 840 841
	rqd->bio = NULL;
}

static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
{
	struct nvm_rq rqd;
842
	int ret = 0;
843 844 845 846 847 848 849 850

	memset(&rqd, 0, sizeof(struct nvm_rq));

	pblk_setup_e_rq(pblk, &rqd, ppa);

	/* The write thread schedules erases so that it minimizes disturbances
	 * with writes. Thus, there is no need to take the LUN semaphore.
	 */
851
	ret = pblk_submit_io_sync(pblk, &rqd);
852 853 854 855 856
	if (ret) {
		struct nvm_tgt_dev *dev = pblk->dev;
		struct nvm_geo *geo = &dev->geo;

		pr_err("pblk: could not sync erase line:%d,blk:%d\n",
857 858
					pblk_ppa_to_line(ppa),
					pblk_ppa_to_pos(geo, ppa));
859 860 861 862 863 864 865 866 867

		rqd.error = ret;
		goto out;
	}

out:
	rqd.private = pblk;
	__pblk_end_io_erase(pblk, &rqd);

868
	return ret;
869 870 871 872 873 874
}

int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_meta *lm = &pblk->lm;
	struct ppa_addr ppa;
875
	int ret, bit = -1;
876

877 878 879 880 881 882 883 884 885 886
	/* Erase only good blocks, one at a time */
	do {
		spin_lock(&line->lock);
		bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line,
								bit + 1);
		if (bit >= lm->blk_per_line) {
			spin_unlock(&line->lock);
			break;
		}

887 888 889
		ppa = pblk->luns[bit].bppa; /* set ch and lun */
		ppa.g.blk = line->id;

890
		atomic_dec(&line->left_eblks);
891
		WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
892
		spin_unlock(&line->lock);
893

894 895
		ret = pblk_blk_erase_sync(pblk, ppa);
		if (ret) {
896
			pr_err("pblk: failed to erase line %d\n", line->id);
897
			return ret;
898
		}
899
	} while (1);
900 901 902 903

	return 0;
}

904 905 906 907 908 909
static void pblk_line_setup_metadata(struct pblk_line *line,
				     struct pblk_line_mgmt *l_mg,
				     struct pblk_line_meta *lm)
{
	int meta_line;

910 911
	lockdep_assert_held(&l_mg->free_lock);

912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
retry_meta:
	meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
	if (meta_line == PBLK_DATA_LINES) {
		spin_unlock(&l_mg->free_lock);
		io_schedule();
		spin_lock(&l_mg->free_lock);
		goto retry_meta;
	}

	set_bit(meta_line, &l_mg->meta_bitmap);
	line->meta_line = meta_line;

	line->smeta = l_mg->sline_meta[meta_line];
	line->emeta = l_mg->eline_meta[meta_line];

	memset(line->smeta, 0, lm->smeta_len);
	memset(line->emeta->buf, 0, lm->emeta_len[0]);

	line->emeta->mem = 0;
	atomic_set(&line->emeta->sync, 0);
}

934 935 936
/* For now lines are always assumed full lines. Thus, smeta former and current
 * lun bitmaps are omitted.
 */
937
static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
938 939 940 941 942 943
				  struct pblk_line *cur)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
944 945 946
	struct pblk_emeta *emeta = line->emeta;
	struct line_emeta *emeta_buf = emeta->buf;
	struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968
	int nr_blk_line;

	/* After erasing the line, new bad blocks might appear and we risk
	 * having an invalid line
	 */
	nr_blk_line = lm->blk_per_line -
			bitmap_weight(line->blk_bitmap, lm->blk_per_line);
	if (nr_blk_line < lm->min_blk_line) {
		spin_lock(&l_mg->free_lock);
		spin_lock(&line->lock);
		line->state = PBLK_LINESTATE_BAD;
		spin_unlock(&line->lock);

		list_add_tail(&line->list, &l_mg->bad_list);
		spin_unlock(&l_mg->free_lock);

		pr_debug("pblk: line %d is bad\n", line->id);

		return 0;
	}

	/* Run-time metadata */
969
	line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
970 971 972 973

	/* Mark LUNs allocated in this line (all for now) */
	bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len);

974 975 976 977
	smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
	memcpy(smeta_buf->header.uuid, pblk->instance_uuid, 16);
	smeta_buf->header.id = cpu_to_le32(line->id);
	smeta_buf->header.type = cpu_to_le16(line->type);
978 979
	smeta_buf->header.version_major = SMETA_VERSION_MAJOR;
	smeta_buf->header.version_minor = SMETA_VERSION_MINOR;
980 981

	/* Start metadata */
982
	smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
983
	smeta_buf->window_wr_lun = cpu_to_le32(geo->all_luns);
984 985 986 987

	/* Fill metadata among lines */
	if (cur) {
		memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
988 989
		smeta_buf->prev_id = cpu_to_le32(cur->id);
		cur->emeta->buf->next_id = cpu_to_le32(line->id);
990
	} else {
991
		smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
992 993 994
	}

	/* All smeta must be set at this point */
995 996 997
	smeta_buf->header.crc = cpu_to_le32(
			pblk_calc_meta_header_crc(pblk, &smeta_buf->header));
	smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf));
998 999

	/* End metadata */
1000 1001
	memcpy(&emeta_buf->header, &smeta_buf->header,
						sizeof(struct line_header));
1002 1003 1004 1005 1006 1007

	emeta_buf->header.version_major = EMETA_VERSION_MAJOR;
	emeta_buf->header.version_minor = EMETA_VERSION_MINOR;
	emeta_buf->header.crc = cpu_to_le32(
			pblk_calc_meta_header_crc(pblk, &emeta_buf->header));

1008 1009 1010 1011 1012 1013
	emeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
	emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line);
	emeta_buf->nr_valid_lbas = cpu_to_le64(0);
	emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY);
	emeta_buf->crc = cpu_to_le32(0);
	emeta_buf->prev_id = smeta_buf->prev_id;
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029

	return 1;
}

/* For now lines are always assumed full lines. Thus, smeta former and current
 * lun bitmaps are omitted.
 */
static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
			     int init)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	u64 off;
	int bit = -1;
1030
	int emeta_secs;
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041

	line->sec_in_line = lm->sec_per_line;

	/* Capture bad block information on line mapping bitmaps */
	while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line,
					bit + 1)) < lm->blk_per_line) {
		off = bit * geo->sec_per_pl;
		bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off,
							lm->sec_per_line);
		bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux,
							lm->sec_per_line);
1042
		line->sec_in_line -= geo->sec_per_chk;
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
	}

	/* Mark smeta metadata sectors as bad sectors */
	bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
	off = bit * geo->sec_per_pl;
	bitmap_set(line->map_bitmap, off, lm->smeta_sec);
	line->sec_in_line -= lm->smeta_sec;
	line->smeta_ssec = off;
	line->cur_sec = off + lm->smeta_sec;

1053
	if (init && pblk_line_submit_smeta_io(pblk, line, off, PBLK_WRITE)) {
1054
		pr_debug("pblk: line smeta I/O failed. Retry\n");
1055
		return 1;
1056 1057 1058 1059 1060 1061 1062
	}

	bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line);

	/* Mark emeta metadata sectors as bad sectors. We need to consider bad
	 * blocks to make sure that there are enough sectors to store emeta
	 */
1063 1064 1065
	emeta_secs = lm->emeta_sec[0];
	off = lm->sec_per_line;
	while (emeta_secs) {
1066 1067 1068
		off -= geo->sec_per_pl;
		if (!test_bit(off, line->invalid_bitmap)) {
			bitmap_set(line->invalid_bitmap, off, geo->sec_per_pl);
1069
			emeta_secs -= geo->sec_per_pl;
1070 1071 1072 1073
		}
	}

	line->emeta_ssec = off;
1074
	line->sec_in_line -= lm->emeta_sec[0];
1075
	line->nr_valid_lbas = 0;
1076
	line->left_msecs = line->sec_in_line;
1077
	*line->vsc = cpu_to_le32(line->sec_in_line);
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096

	if (lm->sec_per_line - line->sec_in_line !=
		bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) {
		spin_lock(&line->lock);
		line->state = PBLK_LINESTATE_BAD;
		spin_unlock(&line->lock);

		list_add_tail(&line->list, &l_mg->bad_list);
		pr_err("pblk: unexpected line %d is bad\n", line->id);

		return 0;
	}

	return 1;
}

static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_meta *lm = &pblk->lm;
1097
	int blk_in_line = atomic_read(&line->blk_in_line);
1098

1099
	line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC);
1100 1101 1102
	if (!line->map_bitmap)
		return -ENOMEM;

1103 1104
	/* will be initialized using bb info from map_bitmap */
	line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC);
1105
	if (!line->invalid_bitmap) {
1106
		kfree(line->map_bitmap);
1107 1108 1109 1110 1111
		return -ENOMEM;
	}

	spin_lock(&line->lock);
	if (line->state != PBLK_LINESTATE_FREE) {
1112 1113
		kfree(line->map_bitmap);
		kfree(line->invalid_bitmap);
1114
		spin_unlock(&line->lock);
1115 1116 1117
		WARN(1, "pblk: corrupted line %d, state %d\n",
							line->id, line->state);
		return -EAGAIN;
1118
	}
1119

1120
	line->state = PBLK_LINESTATE_OPEN;
1121 1122 1123

	atomic_set(&line->left_eblks, blk_in_line);
	atomic_set(&line->left_seblks, blk_in_line);
1124 1125

	line->meta_distance = lm->meta_distance;
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	spin_unlock(&line->lock);

	/* Bad blocks do not need to be erased */
	bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);

	kref_init(&line->ref);

	return 0;
}

int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	int ret;

	spin_lock(&l_mg->free_lock);
	l_mg->data_line = line;
	list_del(&line->list);

	ret = pblk_line_prepare(pblk, line);
	if (ret) {
		list_add(&line->list, &l_mg->free_list);
1148
		spin_unlock(&l_mg->free_lock);
1149 1150
		return ret;
	}
1151
	spin_unlock(&l_mg->free_lock);
1152

1153
	pblk_rl_free_lines_dec(&pblk->rl, line, true);
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164

	if (!pblk_line_init_bb(pblk, line, 0)) {
		list_add(&line->list, &l_mg->free_list);
		return -EINTR;
	}

	return 0;
}

void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
{
1165
	kfree(line->map_bitmap);
1166 1167 1168 1169 1170 1171 1172 1173 1174
	line->map_bitmap = NULL;
	line->smeta = NULL;
	line->emeta = NULL;
}

struct pblk_line *pblk_line_get(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line_meta *lm = &pblk->lm;
1175 1176
	struct pblk_line *line;
	int ret, bit;
1177 1178 1179

	lockdep_assert_held(&l_mg->free_lock);

1180
retry:
1181 1182
	if (list_empty(&l_mg->free_list)) {
		pr_err("pblk: no free lines\n");
1183
		return NULL;
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
	}

	line = list_first_entry(&l_mg->free_list, struct pblk_line, list);
	list_del(&line->list);
	l_mg->nr_free_lines--;

	bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
	if (unlikely(bit >= lm->blk_per_line)) {
		spin_lock(&line->lock);
		line->state = PBLK_LINESTATE_BAD;
		spin_unlock(&line->lock);

		list_add_tail(&line->list, &l_mg->bad_list);

		pr_debug("pblk: line %d is bad\n", line->id);
1199
		goto retry;
1200 1201
	}

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
	ret = pblk_line_prepare(pblk, line);
	if (ret) {
		if (ret == -EAGAIN) {
			list_add(&line->list, &l_mg->corrupt_list);
			goto retry;
		} else {
			pr_err("pblk: failed to prepare line %d\n", line->id);
			list_add(&line->list, &l_mg->free_list);
			l_mg->nr_free_lines++;
			return NULL;
		}
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
	}

	return line;
}

static struct pblk_line *pblk_line_retry(struct pblk *pblk,
					 struct pblk_line *line)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *retry_line;

1224
retry:
1225 1226 1227
	spin_lock(&l_mg->free_lock);
	retry_line = pblk_line_get(pblk);
	if (!retry_line) {
1228
		l_mg->data_line = NULL;
1229 1230 1231 1232 1233 1234 1235 1236
		spin_unlock(&l_mg->free_lock);
		return NULL;
	}

	retry_line->smeta = line->smeta;
	retry_line->emeta = line->emeta;
	retry_line->meta_line = line->meta_line;

1237
	pblk_line_free(pblk, line);
1238
	l_mg->data_line = retry_line;
1239 1240
	spin_unlock(&l_mg->free_lock);

1241
	pblk_rl_free_lines_dec(&pblk->rl, line, false);
1242

1243 1244 1245
	if (pblk_line_erase(pblk, retry_line))
		goto retry;

1246 1247 1248
	return retry_line;
}

1249 1250 1251 1252 1253 1254 1255
static void pblk_set_space_limit(struct pblk *pblk)
{
	struct pblk_rl *rl = &pblk->rl;

	atomic_set(&rl->rb_space, 0);
}

1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *line;

	spin_lock(&l_mg->free_lock);
	line = pblk_line_get(pblk);
	if (!line) {
		spin_unlock(&l_mg->free_lock);
		return NULL;
	}

	line->seq_nr = l_mg->d_seq_nr++;
	line->type = PBLK_LINETYPE_DATA;
	l_mg->data_line = line;

1272
	pblk_line_setup_metadata(line, l_mg, &pblk->lm);
1273 1274 1275

	/* Allocate next line for preparation */
	l_mg->data_next = pblk_line_get(pblk);
1276 1277 1278 1279 1280 1281 1282 1283 1284
	if (!l_mg->data_next) {
		/* If we cannot get a new line, we need to stop the pipeline.
		 * Only allow as many writes in as we can store safely and then
		 * fail gracefully
		 */
		pblk_set_space_limit(pblk);

		l_mg->data_next = NULL;
	} else {
1285 1286 1287 1288 1289
		l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
		l_mg->data_next->type = PBLK_LINETYPE_DATA;
	}
	spin_unlock(&l_mg->free_lock);

1290 1291 1292 1293 1294 1295
	if (pblk_line_erase(pblk, line)) {
		line = pblk_line_retry(pblk, line);
		if (!line)
			return NULL;
	}

1296
retry_setup:
1297
	if (!pblk_line_init_metadata(pblk, line, NULL)) {
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
		line = pblk_line_retry(pblk, line);
		if (!line)
			return NULL;

		goto retry_setup;
	}

	if (!pblk_line_init_bb(pblk, line, 1)) {
		line = pblk_line_retry(pblk, line);
		if (!line)
			return NULL;

		goto retry_setup;
	}

1313 1314
	pblk_rl_free_lines_dec(&pblk->rl, line, true);

1315 1316 1317
	return line;
}

1318 1319 1320 1321 1322 1323 1324 1325
static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line)
{
	lockdep_assert_held(&pblk->l_mg.free_lock);

	pblk_set_space_limit(pblk);
	pblk->state = PBLK_STATE_STOPPING;
}

1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
static void pblk_line_close_meta_sync(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_line *line, *tline;
	LIST_HEAD(list);

	spin_lock(&l_mg->close_lock);
	if (list_empty(&l_mg->emeta_list)) {
		spin_unlock(&l_mg->close_lock);
		return;
	}

	list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev);
	spin_unlock(&l_mg->close_lock);

	list_for_each_entry_safe(line, tline, &list, list) {
		struct pblk_emeta *emeta = line->emeta;

		while (emeta->mem < lm->emeta_len[0]) {
			int ret;

			ret = pblk_submit_meta_io(pblk, line);
			if (ret) {
				pr_err("pblk: sync meta line %d failed (%d)\n",
							line->id, ret);
				return;
			}
		}
	}

	pblk_wait_for_meta(pblk);
	flush_workqueue(pblk->close_wq);
}

1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
void pblk_pipeline_stop(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	int ret;

	spin_lock(&l_mg->free_lock);
	if (pblk->state == PBLK_STATE_RECOVERING ||
					pblk->state == PBLK_STATE_STOPPED) {
		spin_unlock(&l_mg->free_lock);
		return;
	}
	pblk->state = PBLK_STATE_RECOVERING;
	spin_unlock(&l_mg->free_lock);

	pblk_flush_writer(pblk);
	pblk_wait_for_meta(pblk);

	ret = pblk_recov_pad(pblk);
	if (ret) {
		pr_err("pblk: could not close data on teardown(%d)\n", ret);
		return;
	}

1384
	flush_workqueue(pblk->bb_wq);
1385 1386 1387 1388 1389 1390 1391 1392 1393
	pblk_line_close_meta_sync(pblk);

	spin_lock(&l_mg->free_lock);
	pblk->state = PBLK_STATE_STOPPED;
	l_mg->data_line = NULL;
	l_mg->data_next = NULL;
	spin_unlock(&l_mg->free_lock);
}

1394
struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
1395 1396
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1397
	struct pblk_line *cur, *new = NULL;
1398 1399 1400 1401 1402
	unsigned int left_seblks;

	cur = l_mg->data_line;
	new = l_mg->data_next;
	if (!new)
1403
		goto out;
1404 1405
	l_mg->data_line = new;

1406 1407 1408 1409 1410
	spin_lock(&l_mg->free_lock);
	pblk_line_setup_metadata(new, l_mg, &pblk->lm);
	spin_unlock(&l_mg->free_lock);

retry_erase:
1411 1412 1413
	left_seblks = atomic_read(&new->left_seblks);
	if (left_seblks) {
		/* If line is not fully erased, erase it */
1414
		if (atomic_read(&new->left_eblks)) {
1415
			if (pblk_line_erase(pblk, new))
1416
				goto out;
1417 1418 1419
		} else {
			io_schedule();
		}
1420
		goto retry_erase;
1421 1422 1423
	}

retry_setup:
1424
	if (!pblk_line_init_metadata(pblk, new, cur)) {
1425
		new = pblk_line_retry(pblk, new);
1426
		if (!new)
1427
			goto out;
1428 1429 1430 1431 1432 1433 1434

		goto retry_setup;
	}

	if (!pblk_line_init_bb(pblk, new, 1)) {
		new = pblk_line_retry(pblk, new);
		if (!new)
1435
			goto out;
1436 1437 1438 1439

		goto retry_setup;
	}

1440 1441
	pblk_rl_free_lines_dec(&pblk->rl, new, true);

1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
	/* Allocate next line for preparation */
	spin_lock(&l_mg->free_lock);
	l_mg->data_next = pblk_line_get(pblk);
	if (!l_mg->data_next) {
		/* If we cannot get a new line, we need to stop the pipeline.
		 * Only allow as many writes in as we can store safely and then
		 * fail gracefully
		 */
		pblk_stop_writes(pblk, new);
		l_mg->data_next = NULL;
	} else {
		l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
		l_mg->data_next->type = PBLK_LINETYPE_DATA;
	}
	spin_unlock(&l_mg->free_lock);

1458 1459
out:
	return new;
1460 1461 1462 1463
}

void pblk_line_free(struct pblk *pblk, struct pblk_line *line)
{
1464 1465
	kfree(line->map_bitmap);
	kfree(line->invalid_bitmap);
1466

1467 1468
	*line->vsc = cpu_to_le32(EMPTY_ENTRY);

1469 1470
	line->map_bitmap = NULL;
	line->invalid_bitmap = NULL;
1471 1472
	line->smeta = NULL;
	line->emeta = NULL;
1473 1474
}

1475
static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
1476 1477
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1478
	struct pblk_gc *gc = &pblk->gc;
1479 1480 1481 1482 1483 1484 1485 1486

	spin_lock(&line->lock);
	WARN_ON(line->state != PBLK_LINESTATE_GC);
	line->state = PBLK_LINESTATE_FREE;
	line->gc_group = PBLK_LINEGC_NONE;
	pblk_line_free(pblk, line);
	spin_unlock(&line->lock);

1487 1488
	atomic_dec(&gc->pipeline_gc);

1489 1490 1491 1492 1493 1494 1495 1496
	spin_lock(&l_mg->free_lock);
	list_add_tail(&line->list, &l_mg->free_list);
	l_mg->nr_free_lines++;
	spin_unlock(&l_mg->free_lock);

	pblk_rl_free_lines_inc(&pblk->rl, line);
}

1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
static void pblk_line_put_ws(struct work_struct *work)
{
	struct pblk_line_ws *line_put_ws = container_of(work,
						struct pblk_line_ws, ws);
	struct pblk *pblk = line_put_ws->pblk;
	struct pblk_line *line = line_put_ws->line;

	__pblk_line_put(pblk, line);
	mempool_free(line_put_ws, pblk->gen_ws_pool);
}

void pblk_line_put(struct kref *ref)
{
	struct pblk_line *line = container_of(ref, struct pblk_line, ref);
	struct pblk *pblk = line->pblk;

	__pblk_line_put(pblk, line);
}

void pblk_line_put_wq(struct kref *ref)
{
	struct pblk_line *line = container_of(ref, struct pblk_line, ref);
	struct pblk *pblk = line->pblk;
	struct pblk_line_ws *line_put_ws;

	line_put_ws = mempool_alloc(pblk->gen_ws_pool, GFP_ATOMIC);
	if (!line_put_ws)
		return;

	line_put_ws->pblk = pblk;
	line_put_ws->line = line;
	line_put_ws->priv = NULL;

	INIT_WORK(&line_put_ws->ws, pblk_line_put_ws);
	queue_work(pblk->r_end_wq, &line_put_ws->ws);
}

1534 1535 1536 1537 1538
int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
{
	struct nvm_rq *rqd;
	int err;

1539
	rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);
1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554

	pblk_setup_e_rq(pblk, rqd, ppa);

	rqd->end_io = pblk_end_io_erase;
	rqd->private = pblk;

	/* The write thread schedules erases so that it minimizes disturbances
	 * with writes. Thus, there is no need to take the LUN semaphore.
	 */
	err = pblk_submit_io(pblk, rqd);
	if (err) {
		struct nvm_tgt_dev *dev = pblk->dev;
		struct nvm_geo *geo = &dev->geo;

		pr_err("pblk: could not async erase line:%d,blk:%d\n",
1555 1556
					pblk_ppa_to_line(ppa),
					pblk_ppa_to_pos(geo, ppa));
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
	}

	return err;
}

struct pblk_line *pblk_line_get_data(struct pblk *pblk)
{
	return pblk->l_mg.data_line;
}

1567 1568
/* For now, always erase next line */
struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
1569 1570 1571 1572 1573 1574 1575 1576 1577
{
	return pblk->l_mg.data_next;
}

int pblk_line_is_full(struct pblk_line *line)
{
	return (line->left_msecs == 0);
}

1578 1579 1580 1581 1582 1583
static void pblk_line_should_sync_meta(struct pblk *pblk)
{
	if (pblk_rl_is_limit(&pblk->rl))
		pblk_line_close_meta_sync(pblk);
}

1584 1585 1586 1587 1588
void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct list_head *move_list;

1589 1590 1591
#ifdef CONFIG_NVM_DEBUG
	struct pblk_line_meta *lm = &pblk->lm;

1592
	WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
1593
				"pblk: corrupt closed line %d\n", line->id);
1594
#endif
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607

	spin_lock(&l_mg->free_lock);
	WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap));
	spin_unlock(&l_mg->free_lock);

	spin_lock(&l_mg->gc_lock);
	spin_lock(&line->lock);
	WARN_ON(line->state != PBLK_LINESTATE_OPEN);
	line->state = PBLK_LINESTATE_CLOSED;
	move_list = pblk_line_gc_list(pblk, line);

	list_add_tail(&line->list, move_list);

1608
	kfree(line->map_bitmap);
1609 1610 1611 1612 1613 1614 1615 1616
	line->map_bitmap = NULL;
	line->smeta = NULL;
	line->emeta = NULL;

	spin_unlock(&line->lock);
	spin_unlock(&l_mg->gc_lock);
}

1617 1618 1619 1620 1621 1622
void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_emeta *emeta = line->emeta;
	struct line_emeta *emeta_buf = emeta->buf;
1623
	struct wa_counters *wa = emeta_to_wa(lm, emeta_buf);
1624

1625
	/* No need for exact vsc value; avoid a big line lock and take aprox. */
1626 1627 1628
	memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len);
	memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len);

1629 1630 1631 1632
	wa->user = cpu_to_le64(atomic64_read(&pblk->user_wa));
	wa->pad = cpu_to_le64(atomic64_read(&pblk->pad_wa));
	wa->gc = cpu_to_le64(atomic64_read(&pblk->gc_wa));

1633 1634 1635 1636 1637 1638 1639 1640
	emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas);
	emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf));

	spin_lock(&l_mg->close_lock);
	spin_lock(&line->lock);
	list_add_tail(&line->list, &l_mg->emeta_list);
	spin_unlock(&line->lock);
	spin_unlock(&l_mg->close_lock);
1641 1642

	pblk_line_should_sync_meta(pblk);
1643 1644
}

1645 1646 1647 1648 1649 1650 1651 1652
void pblk_line_close_ws(struct work_struct *work)
{
	struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
									ws);
	struct pblk *pblk = line_ws->pblk;
	struct pblk_line *line = line_ws->line;

	pblk_line_close(pblk, line);
1653
	mempool_free(line_ws, pblk->gen_ws_pool);
1654 1655
}

1656 1657
void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
		      void (*work)(struct work_struct *), gfp_t gfp_mask,
1658
		      struct workqueue_struct *wq)
1659 1660 1661
{
	struct pblk_line_ws *line_ws;

1662
	line_ws = mempool_alloc(pblk->gen_ws_pool, gfp_mask);
1663 1664 1665 1666 1667 1668

	line_ws->pblk = pblk;
	line_ws->line = line;
	line_ws->priv = priv;

	INIT_WORK(&line_ws->ws, work);
1669
	queue_work(wq, &line_ws->ws);
1670 1671
}

1672 1673
static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
			     int nr_ppas, int pos)
1674
{
1675
	struct pblk_lun *rlun = &pblk->luns[pos];
1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
	int ret;

	/*
	 * Only send one inflight I/O per LUN. Since we map at a page
	 * granurality, all ppas in the I/O will map to the same LUN
	 */
#ifdef CONFIG_NVM_DEBUG
	int i;

	for (i = 1; i < nr_ppas; i++)
		WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
				ppa_list[0].g.ch != ppa_list[i].g.ch);
#endif

1690
	ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
1691 1692
	if (ret == -ETIME || ret == -EINTR)
		pr_err("pblk: taking lun semaphore timed out: err %d\n", -ret);
1693 1694
}

1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	int pos = pblk_ppa_to_pos(geo, ppa_list[0]);

	__pblk_down_page(pblk, ppa_list, nr_ppas, pos);
}

void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
		  unsigned long *lun_bitmap)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	int pos = pblk_ppa_to_pos(geo, ppa_list[0]);

	/* If the LUN has been locked for this same request, do no attempt to
	 * lock it again
	 */
	if (test_and_set_bit(pos, lun_bitmap))
		return;

	__pblk_down_page(pblk, ppa_list, nr_ppas, pos);
}

void pblk_up_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_lun *rlun;
	int pos = pblk_ppa_to_pos(geo, ppa_list[0]);

#ifdef CONFIG_NVM_DEBUG
	int i;

	for (i = 1; i < nr_ppas; i++)
		WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
				ppa_list[0].g.ch != ppa_list[i].g.ch);
#endif

	rlun = &pblk->luns[pos];
	up(&rlun->wr_sem);
}

1739 1740 1741 1742 1743 1744
void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
		unsigned long *lun_bitmap)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_lun *rlun;
1745
	int nr_luns = geo->all_luns;
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
	int bit = -1;

	while ((bit = find_next_bit(lun_bitmap, nr_luns, bit + 1)) < nr_luns) {
		rlun = &pblk->luns[bit];
		up(&rlun->wr_sem);
	}
}

void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
{
1756
	struct ppa_addr ppa_l2p;
1757 1758 1759 1760 1761 1762 1763 1764

	/* logic error: lba out-of-bounds. Ignore update */
	if (!(lba < pblk->rl.nr_secs)) {
		WARN(1, "pblk: corrupted L2P map request\n");
		return;
	}

	spin_lock(&pblk->trans_lock);
1765
	ppa_l2p = pblk_trans_map_get(pblk, lba);
1766

1767 1768
	if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p))
		pblk_map_invalidate(pblk, ppa_l2p);
1769 1770 1771 1772 1773 1774 1775

	pblk_trans_map_set(pblk, lba, ppa);
	spin_unlock(&pblk->trans_lock);
}

void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
{
1776

1777 1778 1779 1780 1781 1782 1783 1784 1785
#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a cache address */
	BUG_ON(!pblk_addr_in_cache(ppa));
	BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
#endif

	pblk_update_map(pblk, lba, ppa);
}

1786
int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
1787
		       struct pblk_line *gc_line, u64 paddr_gc)
1788
{
1789
	struct ppa_addr ppa_l2p, ppa_gc;
1790 1791 1792 1793
	int ret = 1;

#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a cache address */
1794 1795
	BUG_ON(!pblk_addr_in_cache(ppa_new));
	BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new)));
1796 1797 1798 1799 1800 1801 1802 1803 1804
#endif

	/* logic error: lba out-of-bounds. Ignore update */
	if (!(lba < pblk->rl.nr_secs)) {
		WARN(1, "pblk: corrupted L2P map request\n");
		return 0;
	}

	spin_lock(&pblk->trans_lock);
1805
	ppa_l2p = pblk_trans_map_get(pblk, lba);
1806
	ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id);
1807

1808 1809 1810 1811 1812
	if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) {
		spin_lock(&gc_line->lock);
		WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap),
						"pblk: corrupted GC update");
		spin_unlock(&gc_line->lock);
1813

1814 1815 1816 1817
		ret = 0;
		goto out;
	}

1818
	pblk_trans_map_set(pblk, lba, ppa_new);
1819 1820 1821 1822 1823
out:
	spin_unlock(&pblk->trans_lock);
	return ret;
}

1824 1825
void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
			 struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache)
1826
{
1827
	struct ppa_addr ppa_l2p;
1828 1829 1830

#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a device address */
1831
	BUG_ON(pblk_addr_in_cache(ppa_mapped));
1832 1833 1834
#endif
	/* Invalidate and discard padded entries */
	if (lba == ADDR_EMPTY) {
1835
		atomic64_inc(&pblk->pad_wa);
1836 1837 1838
#ifdef CONFIG_NVM_DEBUG
		atomic_long_inc(&pblk->padded_wb);
#endif
1839 1840
		if (!pblk_ppa_empty(ppa_mapped))
			pblk_map_invalidate(pblk, ppa_mapped);
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
		return;
	}

	/* logic error: lba out-of-bounds. Ignore update */
	if (!(lba < pblk->rl.nr_secs)) {
		WARN(1, "pblk: corrupted L2P map request\n");
		return;
	}

	spin_lock(&pblk->trans_lock);
1851
	ppa_l2p = pblk_trans_map_get(pblk, lba);
1852 1853 1854 1855

	/* Do not update L2P if the cacheline has been updated. In this case,
	 * the mapped ppa must be invalidated
	 */
1856 1857 1858
	if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) {
		if (!pblk_ppa_empty(ppa_mapped))
			pblk_map_invalidate(pblk, ppa_mapped);
1859 1860 1861 1862
		goto out;
	}

#ifdef CONFIG_NVM_DEBUG
1863
	WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p));
1864 1865
#endif

1866
	pblk_trans_map_set(pblk, lba, ppa_mapped);
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
out:
	spin_unlock(&pblk->trans_lock);
}

void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
			 sector_t blba, int nr_secs)
{
	int i;

	spin_lock(&pblk->trans_lock);
1877 1878 1879 1880 1881 1882 1883
	for (i = 0; i < nr_secs; i++) {
		struct ppa_addr ppa;

		ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i);

		/* If the L2P entry maps to a line, the reference is valid */
		if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) {
1884
			int line_id = pblk_ppa_to_line(ppa);
1885 1886 1887 1888 1889
			struct pblk_line *line = &pblk->lines[line_id];

			kref_get(&line->ref);
		}
	}
1890 1891 1892 1893 1894 1895
	spin_unlock(&pblk->trans_lock);
}

void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
			  u64 *lba_list, int nr_secs)
{
1896
	u64 lba;
1897 1898 1899 1900 1901
	int i;

	spin_lock(&pblk->trans_lock);
	for (i = 0; i < nr_secs; i++) {
		lba = lba_list[i];
1902
		if (lba != ADDR_EMPTY) {
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
			/* logic error: lba out-of-bounds. Ignore update */
			if (!(lba < pblk->rl.nr_secs)) {
				WARN(1, "pblk: corrupted L2P map request\n");
				continue;
			}
			ppas[i] = pblk_trans_map_get(pblk, lba);
		}
	}
	spin_unlock(&pblk->trans_lock);
}