pblk-core.c 45.6 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"

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;
	int pos = pblk_dev_ppa_to_pos(geo, *ppa);

	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;

	line = &pblk->lines[pblk_dev_ppa_to_line(rqd->ppa_addr)];
	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

	line_id = pblk_tgt_ppa_to_line(ppa);
	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));
}

void pblk_write_timer_fn(unsigned long data)
{
	struct pblk *pblk = (struct pblk *)data;

	/* 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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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);
}

struct ppa_addr pblk_get_lba_map(struct pblk *pblk, sector_t lba)
{
	struct ppa_addr ppa;

	spin_lock(&pblk->trans_lock);
	ppa = pblk_trans_map_get(pblk, lba);
	spin_unlock(&pblk->trans_lock);

	return ppa;
}

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
	struct ppa_addr *ppa_list;

	ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
	if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) {
		WARN_ON(1);
		return -EINVAL;
	}

	if (rqd->opcode == NVM_OP_PWRITE) {
		struct pblk_line *line;
		struct ppa_addr ppa;
		int i;

		for (i = 0; i < rqd->nr_ppas; i++) {
			ppa = ppa_list[i];
			line = &pblk->lines[pblk_dev_ppa_to_line(ppa)];

			spin_lock(&line->lock);
			if (line->state != PBLK_LINESTATE_OPEN) {
				pr_err("pblk: bad ppa: line:%d,state:%d\n",
							line->id, line->state);
				WARN_ON(1);
				spin_unlock(&line->lock);
				return -EINVAL;
			}
			spin_unlock(&line->lock);
		}
	}
#endif
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	atomic_inc(&pblk->inflight_io);

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	return nvm_submit_io(dev, rqd);
}

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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;
	DECLARE_COMPLETION_ONSTACK(wait);

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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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	rqd.end_io = pblk_end_io_sync;
	rqd.private = &wait;

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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);
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		for (i = 0; i < rqd.nr_ppas; ) {
			spin_lock(&line->lock);
			paddr = __pblk_alloc_page(pblk, line, min);
			spin_unlock(&line->lock);
639 640
			for (j = 0; j < min; j++, i++, paddr++) {
				meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
641 642
				rqd.ppa_list[i] =
					addr_to_gen_ppa(pblk, paddr, id);
643
			}
644 645 646 647 648
		}
	} else {
		for (i = 0; i < rqd.nr_ppas; ) {
			struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, id);
			int pos = pblk_dev_ppa_to_pos(geo, ppa);
649 650 651 652 653
			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);
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693

			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);
				pos = pblk_dev_ppa_to_pos(geo, ppa);
			}

			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);
		}
	}

	ret = pblk_submit_io(pblk, &rqd);
	if (ret) {
		pr_err("pblk: emeta I/O submission failed: %d\n", ret);
		bio_put(bio);
		goto free_rqd_dma;
	}

	if (!wait_for_completion_io_timeout(&wait,
				msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
		pr_err("pblk: emeta I/O timed out\n");
	}
694
	atomic_dec(&pblk->inflight_io);
695 696 697
	reinit_completion(&wait);

	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);
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
	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;
	DECLARE_COMPLETION_ONSTACK(wait);

741
	if (dir == PBLK_WRITE) {
742 743
		bio_op = REQ_OP_WRITE;
		cmd_op = NVM_OP_PWRITE;
744
		flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
745
		lba_list = emeta_to_lbas(pblk, line->emeta->buf);
746
	} else if (dir == PBLK_READ) {
747 748
		bio_op = REQ_OP_READ;
		cmd_op = NVM_OP_PREAD;
749
		flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
750 751 752 753 754
	} else
		return -EINVAL;

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

755 756 757
	rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
							&rqd.dma_meta_list);
	if (!rqd.meta_list)
758 759
		return -ENOMEM;

760 761 762
	rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
	rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;

763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
	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;
	rqd.end_io = pblk_end_io_sync;
	rqd.private = &wait;

	for (i = 0; i < lm->smeta_sec; i++, paddr++) {
780 781
		struct pblk_sec_meta *meta_list = rqd.meta_list;

782
		rqd.ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
783

784
		if (dir == PBLK_WRITE) {
785
			__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
786 787 788

			meta_list[i].lba = lba_list[paddr] = addr_empty;
		}
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806
	}

	/*
	 * 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.
	 */
	ret = pblk_submit_io(pblk, &rqd);
	if (ret) {
		pr_err("pblk: smeta I/O submission failed: %d\n", ret);
		bio_put(bio);
		goto free_ppa_list;
	}

	if (!wait_for_completion_io_timeout(&wait,
				msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
		pr_err("pblk: smeta I/O timed out\n");
	}
807
	atomic_dec(&pblk->inflight_io);
808 809

	if (rqd.error) {
810
		if (dir == PBLK_WRITE)
811 812 813 814 815 816
			pblk_log_write_err(pblk, &rqd);
		else
			pblk_log_read_err(pblk, &rqd);
	}

free_ppa_list:
817
	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
818 819 820 821 822 823 824 825

	return ret;
}

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

826
	return pblk_line_submit_smeta_io(pblk, line, bpaddr, PBLK_READ);
827 828
}

829 830
int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line,
			 void *emeta_buf)
831
{
832
	return pblk_line_submit_emeta_io(pblk, line, emeta_buf,
833
						line->emeta_ssec, PBLK_READ);
834 835 836 837 838 839 840 841
}

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;
842
	rqd->flags = pblk_set_progr_mode(pblk, PBLK_ERASE);
843 844 845 846 847 848
	rqd->bio = NULL;
}

static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
{
	struct nvm_rq rqd;
849
	int ret = 0;
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
	DECLARE_COMPLETION_ONSTACK(wait);

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

	pblk_setup_e_rq(pblk, &rqd, ppa);

	rqd.end_io = pblk_end_io_sync;
	rqd.private = &wait;

	/* The write thread schedules erases so that it minimizes disturbances
	 * with writes. Thus, there is no need to take the LUN semaphore.
	 */
	ret = pblk_submit_io(pblk, &rqd);
	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",
					pblk_dev_ppa_to_line(ppa),
					pblk_dev_ppa_to_pos(geo, ppa));

		rqd.error = ret;
		goto out;
	}

	if (!wait_for_completion_io_timeout(&wait,
				msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
		pr_err("pblk: sync erase timed out\n");
	}

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

884
	return ret;
885 886 887 888 889 890
}

int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_meta *lm = &pblk->lm;
	struct ppa_addr ppa;
891
	int ret, bit = -1;
892

893 894 895 896 897 898 899 900 901 902
	/* 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;
		}

903 904 905
		ppa = pblk->luns[bit].bppa; /* set ch and lun */
		ppa.g.blk = line->id;

906
		atomic_dec(&line->left_eblks);
907
		WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
908
		spin_unlock(&line->lock);
909

910 911
		ret = pblk_blk_erase_sync(pblk, ppa);
		if (ret) {
912
			pr_err("pblk: failed to erase line %d\n", line->id);
913
			return ret;
914
		}
915
	} while (1);
916 917 918 919

	return 0;
}

920 921 922 923 924 925
static void pblk_line_setup_metadata(struct pblk_line *line,
				     struct pblk_line_mgmt *l_mg,
				     struct pblk_line_meta *lm)
{
	int meta_line;

926 927
	lockdep_assert_held(&l_mg->free_lock);

928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
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);
}

950 951 952
/* For now lines are always assumed full lines. Thus, smeta former and current
 * lun bitmaps are omitted.
 */
953
static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
954 955 956 957 958 959
				  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;
960 961 962
	struct pblk_emeta *emeta = line->emeta;
	struct line_emeta *emeta_buf = emeta->buf;
	struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
	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 */
985
	line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
986 987 988 989

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

990 991 992 993
	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);
994
	smeta_buf->header.version = SMETA_VERSION;
995 996

	/* Start metadata */
997 998
	smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
	smeta_buf->window_wr_lun = cpu_to_le32(geo->nr_luns);
999 1000 1001 1002

	/* Fill metadata among lines */
	if (cur) {
		memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
1003 1004
		smeta_buf->prev_id = cpu_to_le32(cur->id);
		cur->emeta->buf->next_id = cpu_to_le32(line->id);
1005
	} else {
1006
		smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
1007 1008 1009
	}

	/* All smeta must be set at this point */
1010 1011 1012
	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));
1013 1014

	/* End metadata */
1015 1016 1017 1018 1019 1020 1021 1022
	memcpy(&emeta_buf->header, &smeta_buf->header,
						sizeof(struct line_header));
	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;
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

	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;
	int nr_bb = 0;
	u64 off;
	int bit = -1;

	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);
		line->sec_in_line -= geo->sec_per_blk;
		if (bit >= lm->emeta_bb)
			nr_bb++;
	}

	/* 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;

1064
	if (init && pblk_line_submit_smeta_io(pblk, line, off, PBLK_WRITE)) {
1065
		pr_debug("pblk: line smeta I/O failed. Retry\n");
1066
		return 1;
1067 1068 1069 1070 1071 1072 1073 1074
	}

	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
	 */
	bit = lm->sec_per_line;
1075 1076
	off = lm->sec_per_line - lm->emeta_sec[0];
	bitmap_set(line->invalid_bitmap, off, lm->emeta_sec[0]);
1077 1078 1079 1080 1081 1082 1083 1084
	while (nr_bb) {
		off -= geo->sec_per_pl;
		if (!test_bit(off, line->invalid_bitmap)) {
			bitmap_set(line->invalid_bitmap, off, geo->sec_per_pl);
			nr_bb--;
		}
	}

1085
	line->sec_in_line -= lm->emeta_sec[0];
1086
	line->emeta_ssec = off;
1087
	line->nr_valid_lbas = 0;
1088
	line->left_msecs = line->sec_in_line;
1089
	*line->vsc = cpu_to_le32(line->sec_in_line);
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108

	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;
1109
	int blk_in_line = atomic_read(&line->blk_in_line);
1110

1111
	line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC);
1112 1113 1114
	if (!line->map_bitmap)
		return -ENOMEM;

1115 1116
	/* will be initialized using bb info from map_bitmap */
	line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC);
1117
	if (!line->invalid_bitmap) {
1118
		kfree(line->map_bitmap);
1119 1120 1121 1122 1123
		return -ENOMEM;
	}

	spin_lock(&line->lock);
	if (line->state != PBLK_LINESTATE_FREE) {
1124 1125
		kfree(line->map_bitmap);
		kfree(line->invalid_bitmap);
1126
		spin_unlock(&line->lock);
1127 1128 1129
		WARN(1, "pblk: corrupted line %d, state %d\n",
							line->id, line->state);
		return -EAGAIN;
1130
	}
1131

1132
	line->state = PBLK_LINESTATE_OPEN;
1133 1134 1135

	atomic_set(&line->left_eblks, blk_in_line);
	atomic_set(&line->left_seblks, blk_in_line);
1136 1137

	line->meta_distance = lm->meta_distance;
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
	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);
1160
		spin_unlock(&l_mg->free_lock);
1161 1162
		return ret;
	}
1163
	spin_unlock(&l_mg->free_lock);
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176

	pblk_rl_free_lines_dec(&pblk->rl, line);

	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)
{
1177
	kfree(line->map_bitmap);
1178 1179 1180 1181 1182 1183 1184 1185 1186
	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;
1187 1188
	struct pblk_line *line;
	int ret, bit;
1189 1190 1191

	lockdep_assert_held(&l_mg->free_lock);

1192
retry:
1193 1194
	if (list_empty(&l_mg->free_list)) {
		pr_err("pblk: no free lines\n");
1195
		return NULL;
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
	}

	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);
1211
		goto retry;
1212 1213
	}

1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
	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;
		}
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
	}

	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;

1236
retry:
1237 1238 1239
	spin_lock(&l_mg->free_lock);
	retry_line = pblk_line_get(pblk);
	if (!retry_line) {
1240
		l_mg->data_line = NULL;
1241 1242 1243 1244 1245 1246 1247 1248
		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;

1249
	pblk_line_free(pblk, line);
1250
	l_mg->data_line = retry_line;
1251 1252 1253 1254
	spin_unlock(&l_mg->free_lock);

	pblk_rl_free_lines_dec(&pblk->rl, retry_line);

1255 1256 1257
	if (pblk_line_erase(pblk, retry_line))
		goto retry;

1258 1259 1260
	return retry_line;
}

1261 1262 1263 1264 1265 1266 1267
static void pblk_set_space_limit(struct pblk *pblk)
{
	struct pblk_rl *rl = &pblk->rl;

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

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *line;
	int is_next = 0;

	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;

1285
	pblk_line_setup_metadata(line, l_mg, &pblk->lm);
1286 1287 1288

	/* Allocate next line for preparation */
	l_mg->data_next = pblk_line_get(pblk);
1289 1290 1291 1292 1293 1294 1295 1296 1297
	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 {
1298 1299 1300 1301 1302 1303
		l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
		l_mg->data_next->type = PBLK_LINETYPE_DATA;
		is_next = 1;
	}
	spin_unlock(&l_mg->free_lock);

1304 1305 1306 1307 1308 1309
	if (pblk_line_erase(pblk, line)) {
		line = pblk_line_retry(pblk, line);
		if (!line)
			return NULL;
	}

1310 1311 1312 1313 1314
	pblk_rl_free_lines_dec(&pblk->rl, line);
	if (is_next)
		pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next);

retry_setup:
1315
	if (!pblk_line_init_metadata(pblk, line, NULL)) {
1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
		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;
	}

	return line;
}

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 1361 1362 1363 1364
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;
}

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;
	}

1365
	flush_workqueue(pblk->bb_wq);
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	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);
}

void pblk_line_replace_data(struct pblk *pblk)
1376 1377 1378 1379 1380 1381 1382 1383 1384
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *cur, *new;
	unsigned int left_seblks;
	int is_next = 0;

	cur = l_mg->data_line;
	new = l_mg->data_next;
	if (!new)
1385
		return;
1386 1387
	l_mg->data_line = new;

1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
	spin_lock(&l_mg->free_lock);
	if (pblk->state != PBLK_STATE_RUNNING) {
		l_mg->data_line = NULL;
		l_mg->data_next = NULL;
		spin_unlock(&l_mg->free_lock);
		return;
	}

	pblk_line_setup_metadata(new, l_mg, &pblk->lm);
	spin_unlock(&l_mg->free_lock);

retry_erase:
1400 1401 1402
	left_seblks = atomic_read(&new->left_seblks);
	if (left_seblks) {
		/* If line is not fully erased, erase it */
1403
		if (atomic_read(&new->left_eblks)) {
1404
			if (pblk_line_erase(pblk, new))
1405
				return;
1406 1407 1408
		} else {
			io_schedule();
		}
1409
		goto retry_erase;
1410 1411 1412
	}

retry_setup:
1413
	if (!pblk_line_init_metadata(pblk, new, cur)) {
1414
		new = pblk_line_retry(pblk, new);
1415
		if (!new)
1416
			return;
1417 1418 1419 1420 1421 1422 1423

		goto retry_setup;
	}

	if (!pblk_line_init_bb(pblk, new, 1)) {
		new = pblk_line_retry(pblk, new);
		if (!new)
1424
			return;
1425 1426 1427 1428

		goto retry_setup;
	}

1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	/* 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;
		is_next = 1;
	}
	spin_unlock(&l_mg->free_lock);

	if (is_next)
		pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next);
1448 1449 1450 1451
}

void pblk_line_free(struct pblk *pblk, struct pblk_line *line)
{
1452 1453
	kfree(line->map_bitmap);
	kfree(line->invalid_bitmap);
1454

1455 1456
	*line->vsc = cpu_to_le32(EMPTY_ENTRY);

1457 1458
	line->map_bitmap = NULL;
	line->invalid_bitmap = NULL;
1459 1460
	line->smeta = NULL;
	line->emeta = NULL;
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488
}

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

	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);

	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);
}

int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
{
	struct nvm_rq *rqd;
	int err;

1489
	rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516

	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",
					pblk_dev_ppa_to_line(ppa),
					pblk_dev_ppa_to_pos(geo, ppa));
	}

	return err;
}

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

1517 1518
/* For now, always erase next line */
struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
1519 1520 1521 1522 1523 1524 1525 1526 1527
{
	return pblk->l_mg.data_next;
}

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

1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
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);
1560
	flush_workqueue(pblk->close_wq);
1561 1562 1563 1564 1565 1566 1567 1568
}

static void pblk_line_should_sync_meta(struct pblk *pblk)
{
	if (pblk_rl_is_limit(&pblk->rl))
		pblk_line_close_meta_sync(pblk);
}

1569 1570 1571 1572 1573
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;

1574 1575 1576
#ifdef CONFIG_NVM_DEBUG
	struct pblk_line_meta *lm = &pblk->lm;

1577
	WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
1578
				"pblk: corrupt closed line %d\n", line->id);
1579
#endif
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592

	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);

1593
	kfree(line->map_bitmap);
1594 1595 1596 1597 1598 1599 1600 1601
	line->map_bitmap = NULL;
	line->smeta = NULL;
	line->emeta = NULL;

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

1602 1603 1604 1605 1606 1607 1608
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;

1609
	/* No need for exact vsc value; avoid a big line lock and take aprox. */
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
	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);

	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);
1621 1622

	pblk_line_should_sync_meta(pblk);
1623 1624
}

1625 1626 1627 1628 1629 1630 1631 1632
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);
1633
	mempool_free(line_ws, pblk->gen_ws_pool);
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657
}

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;

		line = &pblk->lines[pblk_dev_ppa_to_line(*ppa)];
		pos = pblk_dev_ppa_to_pos(&dev->geo, *ppa);

		pr_err("pblk: failed to mark bb, line:%d, pos:%d\n",
				line->id, pos);
	}

	kfree(ppa);
1658
	mempool_free(line_ws, pblk->gen_ws_pool);
1659 1660
}

1661 1662
void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
		      void (*work)(struct work_struct *), gfp_t gfp_mask,
1663
		      struct workqueue_struct *wq)
1664 1665 1666
{
	struct pblk_line_ws *line_ws;

1667
	line_ws = mempool_alloc(pblk->gen_ws_pool, gfp_mask);
1668 1669 1670 1671 1672 1673

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

	INIT_WORK(&line_ws->ws, work);
1674
	queue_work(wq, &line_ws->ws);
1675 1676
}

1677 1678
static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
			     int nr_ppas, int pos)
1679
{
1680
	struct pblk_lun *rlun = &pblk->luns[pos];
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
	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

1695
	ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
1696 1697
	if (ret == -ETIME || ret == -EINTR)
		pr_err("pblk: taking lun semaphore timed out: err %d\n", -ret);
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 1739 1740 1741 1742 1743
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);
}

1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
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;
	int nr_luns = geo->nr_luns;
	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)
{
1761
	struct ppa_addr ppa_l2p;
1762 1763 1764 1765 1766 1767 1768 1769

	/* 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);
1770
	ppa_l2p = pblk_trans_map_get(pblk, lba);
1771

1772 1773
	if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p))
		pblk_map_invalidate(pblk, ppa_l2p);
1774 1775 1776 1777 1778 1779 1780

	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)
{
1781

1782 1783 1784 1785 1786 1787 1788 1789 1790
#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);
}

1791
int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
1792
		       struct pblk_line *gc_line, u64 paddr_gc)
1793
{
1794
	struct ppa_addr ppa_l2p, ppa_gc;
1795 1796 1797 1798
	int ret = 1;

#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a cache address */
1799 1800
	BUG_ON(!pblk_addr_in_cache(ppa_new));
	BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new)));
1801 1802 1803 1804 1805 1806 1807 1808 1809
#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);
1810
	ppa_l2p = pblk_trans_map_get(pblk, lba);
1811
	ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id);
1812

1813 1814 1815 1816 1817
	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);
1818

1819 1820 1821 1822
		ret = 0;
		goto out;
	}

1823
	pblk_trans_map_set(pblk, lba, ppa_new);
1824 1825 1826 1827 1828
out:
	spin_unlock(&pblk->trans_lock);
	return ret;
}

1829 1830
void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
			 struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache)
1831
{
1832
	struct ppa_addr ppa_l2p;
1833 1834 1835

#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a device address */
1836
	BUG_ON(pblk_addr_in_cache(ppa_mapped));
1837 1838 1839 1840 1841 1842
#endif
	/* Invalidate and discard padded entries */
	if (lba == ADDR_EMPTY) {
#ifdef CONFIG_NVM_DEBUG
		atomic_long_inc(&pblk->padded_wb);
#endif
1843 1844
		if (!pblk_ppa_empty(ppa_mapped))
			pblk_map_invalidate(pblk, ppa_mapped);
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
		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);
1855
	ppa_l2p = pblk_trans_map_get(pblk, lba);
1856 1857 1858 1859

	/* Do not update L2P if the cacheline has been updated. In this case,
	 * the mapped ppa must be invalidated
	 */
1860 1861 1862
	if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) {
		if (!pblk_ppa_empty(ppa_mapped))
			pblk_map_invalidate(pblk, ppa_mapped);
1863 1864 1865 1866
		goto out;
	}

#ifdef CONFIG_NVM_DEBUG
1867
	WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p));
1868 1869
#endif

1870
	pblk_trans_map_set(pblk, lba, ppa_mapped);
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
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);
	for (i = 0; i < nr_secs; i++)
		ppas[i] = pblk_trans_map_get(pblk, blba + i);
	spin_unlock(&pblk->trans_lock);
}

void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
			  u64 *lba_list, int nr_secs)
{
1889
	u64 lba;
1890 1891 1892 1893 1894
	int i;

	spin_lock(&pblk->trans_lock);
	for (i = 0; i < nr_secs; i++) {
		lba = lba_list[i];
1895
		if (lba != ADDR_EMPTY) {
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
			/* 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);
}