[linux-block.git] / drivers / lightnvm / pblk-read.c

/*
 * 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-read.c - pblk's read path
 */

#include "pblk.h"

/*
 * There is no guarantee that the value read from cache has not been updated and
 * resides at another location in the cache. We guarantee though that if the
 * value is read from the cache, it belongs to the mapped lba. In order to
 * guarantee and order between writes and reads are ordered, a flush must be
 * issued.
 */
static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio,
				sector_t lba, struct ppa_addr ppa,
				int bio_iter, bool advanced_bio)
{
#ifdef CONFIG_NVM_DEBUG
	/* Callers must ensure that the ppa points to a cache address */
	BUG_ON(pblk_ppa_empty(ppa));
	BUG_ON(!pblk_addr_in_cache(ppa));
#endif

	return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa,
						bio_iter, advanced_bio);
}

static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
				 sector_t blba, unsigned long *read_bitmap)
{
	struct pblk_sec_meta *meta_list = rqd->meta_list;
	struct bio *bio = rqd->bio;
	struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS];
	int nr_secs = rqd->nr_ppas;
	bool advanced_bio = false;
	int i, j = 0;

	pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs);

	for (i = 0; i < nr_secs; i++) {
		struct ppa_addr p = ppas[i];
		sector_t lba = blba + i;

retry:
		if (pblk_ppa_empty(p)) {
			WARN_ON(test_and_set_bit(i, read_bitmap));
			meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);

			if (unlikely(!advanced_bio)) {
				bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE);
				advanced_bio = true;
			}

			goto next;
		}

		/* Try to read from write buffer. The address is later checked
		 * on the write buffer to prevent retrieving overwritten data.
		 */
		if (pblk_addr_in_cache(p)) {
			if (!pblk_read_from_cache(pblk, bio, lba, p, i,
								advanced_bio)) {
				pblk_lookup_l2p_seq(pblk, &p, lba, 1);
				goto retry;
			}
			WARN_ON(test_and_set_bit(i, read_bitmap));
			meta_list[i].lba = cpu_to_le64(lba);
			advanced_bio = true;
#ifdef CONFIG_NVM_DEBUG
			atomic_long_inc(&pblk->cache_reads);
#endif
		} else {
			/* Read from media non-cached sectors */
			rqd->ppa_list[j++] = p;
		}

next:
		if (advanced_bio)
			bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
	}

	if (pblk_io_aligned(pblk, nr_secs))
		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
	else
		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);

#ifdef CONFIG_NVM_DEBUG
	atomic_long_add(nr_secs, &pblk->inflight_reads);
#endif
}

static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd)
{
	int err;

	err = pblk_submit_io(pblk, rqd);
	if (err)
		return NVM_IO_ERR;

	return NVM_IO_OK;
}

static void pblk_read_check_seq(struct pblk *pblk, void *meta_list,
				sector_t blba, int nr_lbas)
{
	struct pblk_sec_meta *meta_lba_list = meta_list;
	int i;

	for (i = 0; i < nr_lbas; i++) {
		u64 lba = le64_to_cpu(meta_lba_list[i].lba);

		if (lba == ADDR_EMPTY)
			continue;

		WARN(lba != blba + i, "pblk: corrupted read LBA\n");
	}
}

/*
 * There can be holes in the lba list.
 */
static void pblk_read_check_rand(struct pblk *pblk, void *meta_list,
				u64 *lba_list, int nr_lbas)
{
	struct pblk_sec_meta *meta_lba_list = meta_list;
	int i, j;

	for (i = 0, j = 0; i < nr_lbas; i++) {
		u64 lba = lba_list[i];
		u64 meta_lba;

		if (lba == ADDR_EMPTY)
			continue;

		meta_lba = le64_to_cpu(meta_lba_list[j++].lba);

		if (lba != meta_lba) {
			pr_err("pblk: corrupted read LBA (%llu/%llu)\n",
								lba, meta_lba);
			WARN_ON(1);
		}
	}
}

static void pblk_read_put_rqd_kref(struct pblk *pblk, struct nvm_rq *rqd)
{
	struct ppa_addr *ppa_list;
	int i;

	ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;

	for (i = 0; i < rqd->nr_ppas; i++) {
		struct ppa_addr ppa = ppa_list[i];
		struct pblk_line *line;

		line = &pblk->lines[pblk_ppa_to_line(ppa)];
		kref_put(&line->ref, pblk_line_put_wq);
	}
}

static void pblk_end_user_read(struct bio *bio)
{
#ifdef CONFIG_NVM_DEBUG
	WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n");
#endif
	bio_endio(bio);
	bio_put(bio);
}

static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd,
			       bool put_line)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
	struct bio *bio = rqd->bio;
	unsigned long start_time = r_ctx->start_time;

	generic_end_io_acct(dev->q, READ, &pblk->disk->part0, start_time);

	if (rqd->error)
		pblk_log_read_err(pblk, rqd);
#ifdef CONFIG_NVM_DEBUG
	else
		WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n");
#endif

	pblk_read_check_seq(pblk, rqd->meta_list, r_ctx->lba, rqd->nr_ppas);

	bio_put(bio);
	if (r_ctx->private)
		pblk_end_user_read((struct bio *)r_ctx->private);

	if (put_line)
		pblk_read_put_rqd_kref(pblk, rqd);

#ifdef CONFIG_NVM_DEBUG
	atomic_long_add(rqd->nr_ppas, &pblk->sync_reads);
	atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads);
#endif

	pblk_free_rqd(pblk, rqd, PBLK_READ);
	atomic_dec(&pblk->inflight_io);
}

static void pblk_end_io_read(struct nvm_rq *rqd)
{
	struct pblk *pblk = rqd->private;

	__pblk_end_io_read(pblk, rqd, true);
}

static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
				 unsigned int bio_init_idx,
				 unsigned long *read_bitmap)
{
	struct bio *new_bio, *bio = rqd->bio;
	struct pblk_sec_meta *meta_list = rqd->meta_list;
	struct bio_vec src_bv, dst_bv;
	void *ppa_ptr = NULL;
	void *src_p, *dst_p;
	dma_addr_t dma_ppa_list = 0;
	__le64 *lba_list_mem, *lba_list_media;
	int nr_secs = rqd->nr_ppas;
	int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
	int i, ret, hole;

	/* Re-use allocated memory for intermediate lbas */
	lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size);
	lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size);

	new_bio = bio_alloc(GFP_KERNEL, nr_holes);

	if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
		goto err;

	if (nr_holes != new_bio->bi_vcnt) {
		pr_err("pblk: malformed bio\n");
		goto err;
	}

	for (i = 0; i < nr_secs; i++)
		lba_list_mem[i] = meta_list[i].lba;

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

	rqd->bio = new_bio;
	rqd->nr_ppas = nr_holes;
	rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);

	if (unlikely(nr_holes == 1)) {
		ppa_ptr = rqd->ppa_list;
		dma_ppa_list = rqd->dma_ppa_list;
		rqd->ppa_addr = rqd->ppa_list[0];
	}

	ret = pblk_submit_io_sync(pblk, rqd);
	if (ret) {
		bio_put(rqd->bio);
		pr_err("pblk: sync read IO submission failed\n");
		goto err;
	}

	if (rqd->error) {
		atomic_long_inc(&pblk->read_failed);
#ifdef CONFIG_NVM_DEBUG
		pblk_print_failed_rqd(pblk, rqd, rqd->error);
#endif
	}

	if (unlikely(nr_holes == 1)) {
		struct ppa_addr ppa;

		ppa = rqd->ppa_addr;
		rqd->ppa_list = ppa_ptr;
		rqd->dma_ppa_list = dma_ppa_list;
		rqd->ppa_list[0] = ppa;
	}

	for (i = 0; i < nr_secs; i++) {
		lba_list_media[i] = meta_list[i].lba;
		meta_list[i].lba = lba_list_mem[i];
	}

	/* Fill the holes in the original bio */
	i = 0;
	hole = find_first_zero_bit(read_bitmap, nr_secs);
	do {
		int line_id = pblk_ppa_to_line(rqd->ppa_list[i]);
		struct pblk_line *line = &pblk->lines[line_id];

		kref_put(&line->ref, pblk_line_put);

		meta_list[hole].lba = lba_list_media[i];

		src_bv = new_bio->bi_io_vec[i++];
		dst_bv = bio->bi_io_vec[bio_init_idx + hole];

		src_p = kmap_atomic(src_bv.bv_page);
		dst_p = kmap_atomic(dst_bv.bv_page);

		memcpy(dst_p + dst_bv.bv_offset,
			src_p + src_bv.bv_offset,
			PBLK_EXPOSED_PAGE_SIZE);

		kunmap_atomic(src_p);
		kunmap_atomic(dst_p);

		mempool_free(src_bv.bv_page, &pblk->page_bio_pool);

		hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
	} while (hole < nr_secs);

	bio_put(new_bio);

	/* Complete the original bio and associated request */
	bio_endio(bio);
	rqd->bio = bio;
	rqd->nr_ppas = nr_secs;

	__pblk_end_io_read(pblk, rqd, false);
	return NVM_IO_OK;

err:
	pr_err("pblk: failed to perform partial read\n");

	/* Free allocated pages in new bio */
	pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt);
	__pblk_end_io_read(pblk, rqd, false);
	return NVM_IO_ERR;
}

static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd,
			 sector_t lba, unsigned long *read_bitmap)
{
	struct pblk_sec_meta *meta_list = rqd->meta_list;
	struct bio *bio = rqd->bio;
	struct ppa_addr ppa;

	pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);

#ifdef CONFIG_NVM_DEBUG
	atomic_long_inc(&pblk->inflight_reads);
#endif

retry:
	if (pblk_ppa_empty(ppa)) {
		WARN_ON(test_and_set_bit(0, read_bitmap));
		meta_list[0].lba = cpu_to_le64(ADDR_EMPTY);
		return;
	}

	/* Try to read from write buffer. The address is later checked on the
	 * write buffer to prevent retrieving overwritten data.
	 */
	if (pblk_addr_in_cache(ppa)) {
		if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) {
			pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
			goto retry;
		}

		WARN_ON(test_and_set_bit(0, read_bitmap));
		meta_list[0].lba = cpu_to_le64(lba);

#ifdef CONFIG_NVM_DEBUG
		atomic_long_inc(&pblk->cache_reads);
#endif
	} else {
		rqd->ppa_addr = ppa;
	}

	rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
}

int pblk_submit_read(struct pblk *pblk, struct bio *bio)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct request_queue *q = dev->q;
	sector_t blba = pblk_get_lba(bio);
	unsigned int nr_secs = pblk_get_secs(bio);
	struct pblk_g_ctx *r_ctx;
	struct nvm_rq *rqd;
	unsigned int bio_init_idx;
	unsigned long read_bitmap; /* Max 64 ppas per request */
	int ret = NVM_IO_ERR;

	/* logic error: lba out-of-bounds. Ignore read request */
	if (blba >= pblk->rl.nr_secs || nr_secs > PBLK_MAX_REQ_ADDRS) {
		WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n",
					(unsigned long long)blba, nr_secs);
		return NVM_IO_ERR;
	}

	generic_start_io_acct(q, READ, bio_sectors(bio), &pblk->disk->part0);

	bitmap_zero(&read_bitmap, nr_secs);

	rqd = pblk_alloc_rqd(pblk, PBLK_READ);

	rqd->opcode = NVM_OP_PREAD;
	rqd->bio = bio;
	rqd->nr_ppas = nr_secs;
	rqd->private = pblk;
	rqd->end_io = pblk_end_io_read;

	r_ctx = nvm_rq_to_pdu(rqd);
	r_ctx->start_time = jiffies;
	r_ctx->lba = blba;

	/* Save the index for this bio's start. This is needed in case
	 * we need to fill a partial read.
	 */
	bio_init_idx = pblk_get_bi_idx(bio);

	rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
							&rqd->dma_meta_list);
	if (!rqd->meta_list) {
		pr_err("pblk: not able to allocate ppa list\n");
		goto fail_rqd_free;
	}

	if (nr_secs > 1) {
		rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
		rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;

		pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap);
	} else {
		pblk_read_rq(pblk, rqd, blba, &read_bitmap);
	}

	bio_get(bio);
	if (bitmap_full(&read_bitmap, nr_secs)) {
		bio_endio(bio);
		atomic_inc(&pblk->inflight_io);
		__pblk_end_io_read(pblk, rqd, false);
		return NVM_IO_OK;
	}

	/* All sectors are to be read from the device */
	if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) {
		struct bio *int_bio = NULL;

		/* Clone read bio to deal with read errors internally */
		int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
		if (!int_bio) {
			pr_err("pblk: could not clone read bio\n");
			goto fail_end_io;
		}

		rqd->bio = int_bio;
		r_ctx->private = bio;

		ret = pblk_submit_read_io(pblk, rqd);
		if (ret) {
			pr_err("pblk: read IO submission failed\n");
			if (int_bio)
				bio_put(int_bio);
			goto fail_end_io;
		}

		return NVM_IO_OK;
	}

	/* The read bio request could be partially filled by the write buffer,
	 * but there are some holes that need to be read from the drive.
	 */
	return pblk_partial_read_bio(pblk, rqd, bio_init_idx, &read_bitmap);

fail_rqd_free:
	pblk_free_rqd(pblk, rqd, PBLK_READ);
	return ret;
fail_end_io:
	__pblk_end_io_read(pblk, rqd, false);
	return ret;
}

static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
			      struct pblk_line *line, u64 *lba_list,
			      u64 *paddr_list_gc, unsigned int nr_secs)
{
	struct ppa_addr ppa_list_l2p[PBLK_MAX_REQ_ADDRS];
	struct ppa_addr ppa_gc;
	int valid_secs = 0;
	int i;

	pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs);

	for (i = 0; i < nr_secs; i++) {
		if (lba_list[i] == ADDR_EMPTY)
			continue;

		ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id);
		if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) {
			paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY;
			continue;
		}

		rqd->ppa_list[valid_secs++] = ppa_list_l2p[i];
	}

#ifdef CONFIG_NVM_DEBUG
	atomic_long_add(valid_secs, &pblk->inflight_reads);
#endif

	return valid_secs;
}

static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
		      struct pblk_line *line, sector_t lba,
		      u64 paddr_gc)
{
	struct ppa_addr ppa_l2p, ppa_gc;
	int valid_secs = 0;

	if (lba == ADDR_EMPTY)
		goto out;

	/* logic error: lba out-of-bounds */
	if (lba >= pblk->rl.nr_secs) {
		WARN(1, "pblk: read lba out of bounds\n");
		goto out;
	}

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

	ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id);
	if (!pblk_ppa_comp(ppa_l2p, ppa_gc))
		goto out;

	rqd->ppa_addr = ppa_l2p;
	valid_secs = 1;

#ifdef CONFIG_NVM_DEBUG
	atomic_long_inc(&pblk->inflight_reads);
#endif

out:
	return valid_secs;
}

int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct bio *bio;
	struct nvm_rq rqd;
	int data_len;
	int ret = NVM_IO_OK;

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

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

	if (gc_rq->nr_secs > 1) {
		rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
		rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;

		gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line,
							gc_rq->lba_list,
							gc_rq->paddr_list,
							gc_rq->nr_secs);
		if (gc_rq->secs_to_gc == 1)
			rqd.ppa_addr = rqd.ppa_list[0];
	} else {
		gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line,
							gc_rq->lba_list[0],
							gc_rq->paddr_list[0]);
	}

	if (!(gc_rq->secs_to_gc))
		goto out;

	data_len = (gc_rq->secs_to_gc) * geo->csecs;
	bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len,
						PBLK_VMALLOC_META, GFP_KERNEL);
	if (IS_ERR(bio)) {
		pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio));
		goto err_free_dma;
	}

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

	rqd.opcode = NVM_OP_PREAD;
	rqd.nr_ppas = gc_rq->secs_to_gc;
	rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
	rqd.bio = bio;

	if (pblk_submit_io_sync(pblk, &rqd)) {
		ret = -EIO;
		pr_err("pblk: GC read request failed\n");
		goto err_free_bio;
	}

	pblk_read_check_rand(pblk, rqd.meta_list, gc_rq->lba_list, rqd.nr_ppas);

	atomic_dec(&pblk->inflight_io);

	if (rqd.error) {
		atomic_long_inc(&pblk->read_failed_gc);
#ifdef CONFIG_NVM_DEBUG
		pblk_print_failed_rqd(pblk, &rqd, rqd.error);
#endif
	}

#ifdef CONFIG_NVM_DEBUG
	atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads);
	atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads);
	atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads);
#endif

out:
	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
	return ret;

err_free_bio:
	bio_put(bio);
err_free_dma:
	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
	return ret;
}
Commit	Line	Data
a4bd217b JG	1	/*
	2	* Copyright (C) 2016 CNEX Labs
	3	* Initial release: Javier Gonzalez <javier@cnexlabs.com>
	4	* Matias Bjorling <matias@cnexlabs.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version
	8	* 2 as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*
	15	* pblk-read.c - pblk's read path
	16	*/
	17
	18	#include "pblk.h"
	19
	20	/*
	21	* There is no guarantee that the value read from cache has not been updated and
	22	* resides at another location in the cache. We guarantee though that if the
	23	* value is read from the cache, it belongs to the mapped lba. In order to
	24	* guarantee and order between writes and reads are ordered, a flush must be
	25	* issued.
	26	*/
	27	static int pblk_read_from_cache(struct pblk pblk, struct bio bio,
	28	sector_t lba, struct ppa_addr ppa,
75cb8e93	29	int bio_iter, bool advanced_bio)
a4bd217b JG	30	{
	31	#ifdef CONFIG_NVM_DEBUG
	32	/* Callers must ensure that the ppa points to a cache address */
	33	BUG_ON(pblk_ppa_empty(ppa));
	34	BUG_ON(!pblk_addr_in_cache(ppa));
	35	#endif
	36
75cb8e93 JG	37	return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa,
75cb8e93 JG	38	bio_iter, advanced_bio);
a4bd217b JG	39	}
	40
	41	static void pblk_read_ppalist_rq(struct pblk pblk, struct nvm_rq rqd,
84454e6d	42	sector_t blba, unsigned long *read_bitmap)
a4bd217b	43	{
a4809fee	44	struct pblk_sec_meta *meta_list = rqd->meta_list;
a4bd217b JG	45	struct bio *bio = rqd->bio;
a4bd217b JG	46	struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS];
a4bd217b	47	int nr_secs = rqd->nr_ppas;
75cb8e93	48	bool advanced_bio = false;
a4bd217b JG	49	int i, j = 0;
a4bd217b JG	50
a4bd217b JG	51	pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs);
	52
	53	for (i = 0; i < nr_secs; i++) {
	54	struct ppa_addr p = ppas[i];
	55	sector_t lba = blba + i;
	56
	57	retry:
	58	if (pblk_ppa_empty(p)) {
	59	WARN_ON(test_and_set_bit(i, read_bitmap));
a4809fee	60	meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
75cb8e93 JG	61
	62	if (unlikely(!advanced_bio)) {
	63	bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE);
	64	advanced_bio = true;
	65	}
	66
	67	goto next;
a4bd217b JG	68	}
	69
	70	/* Try to read from write buffer. The address is later checked
	71	* on the write buffer to prevent retrieving overwritten data.
	72	*/
	73	if (pblk_addr_in_cache(p)) {
75cb8e93 JG	74	if (!pblk_read_from_cache(pblk, bio, lba, p, i,
75cb8e93 JG	75	advanced_bio)) {
a4bd217b JG	76	pblk_lookup_l2p_seq(pblk, &p, lba, 1);
	77	goto retry;
	78	}
	79	WARN_ON(test_and_set_bit(i, read_bitmap));
a4809fee	80	meta_list[i].lba = cpu_to_le64(lba);
75cb8e93	81	advanced_bio = true;
db7ada33 JG	82	#ifdef CONFIG_NVM_DEBUG
	83	atomic_long_inc(&pblk->cache_reads);
	84	#endif
a4bd217b JG	85	} else {
	86	/* Read from media non-cached sectors */
	87	rqd->ppa_list[j++] = p;
	88	}
	89
75cb8e93	90	next:
a4bd217b JG	91	if (advanced_bio)
	92	bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
	93	}
	94
f9c10152 JG	95	if (pblk_io_aligned(pblk, nr_secs))
	96	rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
	97	else
	98	rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
	99
a4bd217b JG	100	#ifdef CONFIG_NVM_DEBUG
	101	atomic_long_add(nr_secs, &pblk->inflight_reads);
	102	#endif
	103	}
	104
	105	static int pblk_submit_read_io(struct pblk pblk, struct nvm_rq rqd)
	106	{
	107	int err;
	108
a4bd217b JG	109	err = pblk_submit_io(pblk, rqd);
	110	if (err)
	111	return NVM_IO_ERR;
	112
	113	return NVM_IO_OK;
	114	}
	115
310df582 JG	116	static void pblk_read_check_seq(struct pblk pblk, void meta_list,
310df582 JG	117	sector_t blba, int nr_lbas)
a4809fee	118	{
310df582	119	struct pblk_sec_meta *meta_lba_list = meta_list;
a4809fee JG	120	int i;
	121
	122	for (i = 0; i < nr_lbas; i++) {
310df582	123	u64 lba = le64_to_cpu(meta_lba_list[i].lba);
a4809fee JG	124
	125	if (lba == ADDR_EMPTY)
	126	continue;
	127
	128	WARN(lba != blba + i, "pblk: corrupted read LBA\n");
	129	}
	130	}
	131
310df582 JG	132	/*
	133	* There can be holes in the lba list.
	134	*/
	135	static void pblk_read_check_rand(struct pblk pblk, void meta_list,
	136	u64 *lba_list, int nr_lbas)
	137	{
	138	struct pblk_sec_meta *meta_lba_list = meta_list;
	139	int i, j;
	140
	141	for (i = 0, j = 0; i < nr_lbas; i++) {
	142	u64 lba = lba_list[i];
	143	u64 meta_lba;
	144
	145	if (lba == ADDR_EMPTY)
	146	continue;
	147
	148	meta_lba = le64_to_cpu(meta_lba_list[j++].lba);
	149
	150	if (lba != meta_lba) {
	151	pr_err("pblk: corrupted read LBA (%llu/%llu)\n",
	152	lba, meta_lba);
	153	WARN_ON(1);
	154	}
	155	}
	156	}
	157
7bd4d370 JG	158	static void pblk_read_put_rqd_kref(struct pblk pblk, struct nvm_rq rqd)
	159	{
	160	struct ppa_addr *ppa_list;
	161	int i;
	162
	163	ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
	164
	165	for (i = 0; i < rqd->nr_ppas; i++) {
	166	struct ppa_addr ppa = ppa_list[i];
	167	struct pblk_line *line;
	168
b1bcfda1	169	line = &pblk->lines[pblk_ppa_to_line(ppa)];
7bd4d370 JG	170	kref_put(&line->ref, pblk_line_put_wq);
	171	}
	172	}
	173
	174	static void pblk_end_user_read(struct bio *bio)
	175	{
	176	#ifdef CONFIG_NVM_DEBUG
	177	WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n");
	178	#endif
	179	bio_endio(bio);
	180	bio_put(bio);
	181	}
	182
	183	static void __pblk_end_io_read(struct pblk pblk, struct nvm_rq rqd,
	184	bool put_line)
a4bd217b	185	{
998ba629	186	struct nvm_tgt_dev *dev = pblk->dev;
084ec9ba	187	struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
a4bd217b	188	struct bio *bio = rqd->bio;
998ba629 JG	189	unsigned long start_time = r_ctx->start_time;
	190
	191	generic_end_io_acct(dev->q, READ, &pblk->disk->part0, start_time);
a4bd217b JG	192
	193	if (rqd->error)
	194	pblk_log_read_err(pblk, rqd);
	195	#ifdef CONFIG_NVM_DEBUG
	196	else
4e4cbee9	197	WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n");
a4bd217b JG	198	#endif
a4bd217b JG	199
310df582	200	pblk_read_check_seq(pblk, rqd->meta_list, r_ctx->lba, rqd->nr_ppas);
a4809fee	201
a4bd217b	202	bio_put(bio);
7bd4d370 JG	203	if (r_ctx->private)
7bd4d370 JG	204	pblk_end_user_read((struct bio *)r_ctx->private);
084ec9ba	205
7bd4d370 JG	206	if (put_line)
7bd4d370 JG	207	pblk_read_put_rqd_kref(pblk, rqd);
a4bd217b JG	208
	209	#ifdef CONFIG_NVM_DEBUG
	210	atomic_long_add(rqd->nr_ppas, &pblk->sync_reads);
	211	atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads);
	212	#endif
	213
e2cddf20	214	pblk_free_rqd(pblk, rqd, PBLK_READ);
588726d3	215	atomic_dec(&pblk->inflight_io);
a4bd217b JG	216	}
a4bd217b JG	217
7bd4d370 JG	218	static void pblk_end_io_read(struct nvm_rq *rqd)
	219	{
	220	struct pblk *pblk = rqd->private;
	221
	222	__pblk_end_io_read(pblk, rqd, true);
	223	}
	224
998ba629 JG	225	static int pblk_partial_read_bio(struct pblk pblk, struct nvm_rq rqd,
	226	unsigned int bio_init_idx,
	227	unsigned long *read_bitmap)
a4bd217b JG	228	{
a4bd217b JG	229	struct bio new_bio, bio = rqd->bio;
a4809fee	230	struct pblk_sec_meta *meta_list = rqd->meta_list;
a4bd217b JG	231	struct bio_vec src_bv, dst_bv;
	232	void *ppa_ptr = NULL;
	233	void src_p, dst_p;
	234	dma_addr_t dma_ppa_list = 0;
a4809fee	235	__le64 lba_list_mem, lba_list_media;
a4bd217b JG	236	int nr_secs = rqd->nr_ppas;
	237	int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
	238	int i, ret, hole;
a4bd217b	239
a4809fee JG	240	/* Re-use allocated memory for intermediate lbas */
	241	lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size);
	242	lba_list_media = (((void )rqd->ppa_list) + 2 pblk_dma_ppa_size);
	243
a4bd217b	244	new_bio = bio_alloc(GFP_KERNEL, nr_holes);
a4bd217b JG	245
	246	if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
	247	goto err;
	248
	249	if (nr_holes != new_bio->bi_vcnt) {
	250	pr_err("pblk: malformed bio\n");
	251	goto err;
	252	}
	253
a4809fee JG	254	for (i = 0; i < nr_secs; i++)
	255	lba_list_mem[i] = meta_list[i].lba;
	256
a4bd217b JG	257	new_bio->bi_iter.bi_sector = 0; /* internal bio */
a4bd217b JG	258	bio_set_op_attrs(new_bio, REQ_OP_READ, 0);
a4bd217b JG	259
	260	rqd->bio = new_bio;
	261	rqd->nr_ppas = nr_holes;
f9c10152	262	rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
a4bd217b	263
0f9248cf	264	if (unlikely(nr_holes == 1)) {
a4bd217b JG	265	ppa_ptr = rqd->ppa_list;
	266	dma_ppa_list = rqd->dma_ppa_list;
	267	rqd->ppa_addr = rqd->ppa_list[0];
	268	}
	269
1a94b2d4	270	ret = pblk_submit_io_sync(pblk, rqd);
a4bd217b JG	271	if (ret) {
a4bd217b JG	272	bio_put(rqd->bio);
1a94b2d4	273	pr_err("pblk: sync read IO submission failed\n");
a4bd217b JG	274	goto err;
	275	}
	276
a4bd217b JG	277	if (rqd->error) {
	278	atomic_long_inc(&pblk->read_failed);
	279	#ifdef CONFIG_NVM_DEBUG
	280	pblk_print_failed_rqd(pblk, rqd, rqd->error);
	281	#endif
	282	}
	283
0f9248cf	284	if (unlikely(nr_holes == 1)) {
7bd4d370 JG	285	struct ppa_addr ppa;
	286
	287	ppa = rqd->ppa_addr;
a4bd217b JG	288	rqd->ppa_list = ppa_ptr;
a4bd217b JG	289	rqd->dma_ppa_list = dma_ppa_list;
7bd4d370	290	rqd->ppa_list[0] = ppa;
a4bd217b JG	291	}
a4bd217b JG	292
a4809fee JG	293	for (i = 0; i < nr_secs; i++) {
	294	lba_list_media[i] = meta_list[i].lba;
	295	meta_list[i].lba = lba_list_mem[i];
	296	}
	297
a4bd217b JG	298	/* Fill the holes in the original bio */
	299	i = 0;
	300	hole = find_first_zero_bit(read_bitmap, nr_secs);
	301	do {
b1bcfda1	302	int line_id = pblk_ppa_to_line(rqd->ppa_list[i]);
7bd4d370 JG	303	struct pblk_line *line = &pblk->lines[line_id];
	304
	305	kref_put(&line->ref, pblk_line_put);
	306
a4809fee JG	307	meta_list[hole].lba = lba_list_media[i];
a4809fee JG	308
a4bd217b JG	309	src_bv = new_bio->bi_io_vec[i++];
	310	dst_bv = bio->bi_io_vec[bio_init_idx + hole];
	311
	312	src_p = kmap_atomic(src_bv.bv_page);
	313	dst_p = kmap_atomic(dst_bv.bv_page);
	314
	315	memcpy(dst_p + dst_bv.bv_offset,
	316	src_p + src_bv.bv_offset,
	317	PBLK_EXPOSED_PAGE_SIZE);
	318
	319	kunmap_atomic(src_p);
	320	kunmap_atomic(dst_p);
	321
b906bbb6	322	mempool_free(src_bv.bv_page, &pblk->page_bio_pool);
a4bd217b JG	323
	324	hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
	325	} while (hole < nr_secs);
	326
	327	bio_put(new_bio);
	328
	329	/* Complete the original bio and associated request */
7bd4d370	330	bio_endio(bio);
a4bd217b JG	331	rqd->bio = bio;
a4bd217b JG	332	rqd->nr_ppas = nr_secs;
a4bd217b	333
7bd4d370	334	__pblk_end_io_read(pblk, rqd, false);
a4bd217b JG	335	return NVM_IO_OK;
	336
	337	err:
998ba629 JG	338	pr_err("pblk: failed to perform partial read\n");
998ba629 JG	339
a4bd217b JG	340	/* Free allocated pages in new bio */
a4bd217b JG	341	pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt);
7bd4d370	342	__pblk_end_io_read(pblk, rqd, false);
a4bd217b JG	343	return NVM_IO_ERR;
	344	}
	345
	346	static void pblk_read_rq(struct pblk pblk, struct nvm_rq rqd,
84454e6d	347	sector_t lba, unsigned long *read_bitmap)
a4bd217b	348	{
a4809fee	349	struct pblk_sec_meta *meta_list = rqd->meta_list;
a4bd217b JG	350	struct bio *bio = rqd->bio;
a4bd217b JG	351	struct ppa_addr ppa;
a4bd217b JG	352
	353	pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
	354
	355	#ifdef CONFIG_NVM_DEBUG
	356	atomic_long_inc(&pblk->inflight_reads);
	357	#endif
	358
	359	retry:
	360	if (pblk_ppa_empty(ppa)) {
	361	WARN_ON(test_and_set_bit(0, read_bitmap));
a4809fee	362	meta_list[0].lba = cpu_to_le64(ADDR_EMPTY);
a4bd217b JG	363	return;
	364	}
	365
	366	/* Try to read from write buffer. The address is later checked on the
	367	* write buffer to prevent retrieving overwritten data.
	368	*/
	369	if (pblk_addr_in_cache(ppa)) {
75cb8e93	370	if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) {
a4bd217b JG	371	pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
	372	goto retry;
	373	}
a4809fee	374
7bd4d370	375	WARN_ON(test_and_set_bit(0, read_bitmap));
a4809fee JG	376	meta_list[0].lba = cpu_to_le64(lba);
a4809fee JG	377
db7ada33	378	#ifdef CONFIG_NVM_DEBUG
7bd4d370	379	atomic_long_inc(&pblk->cache_reads);
db7ada33	380	#endif
a4bd217b JG	381	} else {
	382	rqd->ppa_addr = ppa;
	383	}
f9c10152 JG	384
f9c10152 JG	385	rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
a4bd217b JG	386	}
	387
	388	int pblk_submit_read(struct pblk pblk, struct bio bio)
	389	{
	390	struct nvm_tgt_dev *dev = pblk->dev;
998ba629	391	struct request_queue *q = dev->q;
84454e6d	392	sector_t blba = pblk_get_lba(bio);
5bf1e1ee	393	unsigned int nr_secs = pblk_get_secs(bio);
a4809fee	394	struct pblk_g_ctx *r_ctx;
a4bd217b	395	struct nvm_rq *rqd;
a4bd217b	396	unsigned int bio_init_idx;
a4809fee	397	unsigned long read_bitmap; /* Max 64 ppas per request */
a4bd217b JG	398	int ret = NVM_IO_ERR;
a4bd217b JG	399
84454e6d JG	400	/* logic error: lba out-of-bounds. Ignore read request */
	401	if (blba >= pblk->rl.nr_secs \|\| nr_secs > PBLK_MAX_REQ_ADDRS) {
	402	WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n",
	403	(unsigned long long)blba, nr_secs);
a4bd217b	404	return NVM_IO_ERR;
84454e6d	405	}
a4bd217b	406
998ba629 JG	407	generic_start_io_acct(q, READ, bio_sectors(bio), &pblk->disk->part0);
998ba629 JG	408
a4bd217b JG	409	bitmap_zero(&read_bitmap, nr_secs);
a4bd217b JG	410
e2cddf20	411	rqd = pblk_alloc_rqd(pblk, PBLK_READ);
a4bd217b JG	412
	413	rqd->opcode = NVM_OP_PREAD;
	414	rqd->bio = bio;
	415	rqd->nr_ppas = nr_secs;
	416	rqd->private = pblk;
	417	rqd->end_io = pblk_end_io_read;
	418
a4809fee	419	r_ctx = nvm_rq_to_pdu(rqd);
998ba629	420	r_ctx->start_time = jiffies;
a4809fee JG	421	r_ctx->lba = blba;
a4809fee JG	422
a4bd217b JG	423	/* Save the index for this bio's start. This is needed in case
	424	* we need to fill a partial read.
	425	*/
	426	bio_init_idx = pblk_get_bi_idx(bio);
	427
63e3809c JG	428	rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
	429	&rqd->dma_meta_list);
	430	if (!rqd->meta_list) {
	431	pr_err("pblk: not able to allocate ppa list\n");
	432	goto fail_rqd_free;
	433	}
	434
a4bd217b	435	if (nr_secs > 1) {
63e3809c JG	436	rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
63e3809c JG	437	rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;
a4bd217b	438
84454e6d	439	pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap);
a4bd217b	440	} else {
84454e6d	441	pblk_read_rq(pblk, rqd, blba, &read_bitmap);
a4bd217b JG	442	}
	443
	444	bio_get(bio);
	445	if (bitmap_full(&read_bitmap, nr_secs)) {
	446	bio_endio(bio);
588726d3	447	atomic_inc(&pblk->inflight_io);
7bd4d370	448	__pblk_end_io_read(pblk, rqd, false);
a4bd217b JG	449	return NVM_IO_OK;
	450	}
	451
	452	/* All sectors are to be read from the device */
	453	if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) {
	454	struct bio *int_bio = NULL;
a4bd217b JG	455
a4bd217b JG	456	/* Clone read bio to deal with read errors internally */
b906bbb6	457	int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
a4bd217b JG	458	if (!int_bio) {
a4bd217b JG	459	pr_err("pblk: could not clone read bio\n");
998ba629	460	goto fail_end_io;
a4bd217b JG	461	}
	462
	463	rqd->bio = int_bio;
084ec9ba	464	r_ctx->private = bio;
a4bd217b JG	465
	466	ret = pblk_submit_read_io(pblk, rqd);
	467	if (ret) {
	468	pr_err("pblk: read IO submission failed\n");
	469	if (int_bio)
	470	bio_put(int_bio);
998ba629	471	goto fail_end_io;
a4bd217b JG	472	}
	473
	474	return NVM_IO_OK;
	475	}
	476
	477	/* The read bio request could be partially filled by the write buffer,
	478	* but there are some holes that need to be read from the drive.
	479	*/
998ba629	480	return pblk_partial_read_bio(pblk, rqd, bio_init_idx, &read_bitmap);
a4bd217b JG	481
a4bd217b JG	482	fail_rqd_free:
e2cddf20	483	pblk_free_rqd(pblk, rqd, PBLK_READ);
a4bd217b	484	return ret;
998ba629 JG	485	fail_end_io:
	486	__pblk_end_io_read(pblk, rqd, false);
	487	return ret;
a4bd217b JG	488	}
	489
	490	static int read_ppalist_rq_gc(struct pblk pblk, struct nvm_rq rqd,
	491	struct pblk_line line, u64 lba_list,
d340121e	492	u64 *paddr_list_gc, unsigned int nr_secs)
a4bd217b	493	{
d340121e JG	494	struct ppa_addr ppa_list_l2p[PBLK_MAX_REQ_ADDRS];
d340121e JG	495	struct ppa_addr ppa_gc;
a4bd217b JG	496	int valid_secs = 0;
	497	int i;
	498
d340121e	499	pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs);
a4bd217b JG	500
a4bd217b JG	501	for (i = 0; i < nr_secs; i++) {
d340121e JG	502	if (lba_list[i] == ADDR_EMPTY)
	503	continue;
	504
	505	ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id);
	506	if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) {
	507	paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY;
a4bd217b JG	508	continue;
	509	}
	510
d340121e	511	rqd->ppa_list[valid_secs++] = ppa_list_l2p[i];
a4bd217b JG	512	}
	513
	514	#ifdef CONFIG_NVM_DEBUG
	515	atomic_long_add(valid_secs, &pblk->inflight_reads);
	516	#endif
d340121e	517
a4bd217b JG	518	return valid_secs;
	519	}
	520
	521	static int read_rq_gc(struct pblk pblk, struct nvm_rq rqd,
d340121e JG	522	struct pblk_line *line, sector_t lba,
d340121e JG	523	u64 paddr_gc)
a4bd217b	524	{
d340121e	525	struct ppa_addr ppa_l2p, ppa_gc;
a4bd217b JG	526	int valid_secs = 0;
a4bd217b JG	527
659226eb DC	528	if (lba == ADDR_EMPTY)
	529	goto out;
	530
a4bd217b	531	/* logic error: lba out-of-bounds */
2a79efd8 DC	532	if (lba >= pblk->rl.nr_secs) {
2a79efd8 DC	533	WARN(1, "pblk: read lba out of bounds\n");
a4bd217b JG	534	goto out;
	535	}
	536
a4bd217b	537	spin_lock(&pblk->trans_lock);
d340121e	538	ppa_l2p = pblk_trans_map_get(pblk, lba);
a4bd217b JG	539	spin_unlock(&pblk->trans_lock);
a4bd217b JG	540
d340121e JG	541	ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id);
d340121e JG	542	if (!pblk_ppa_comp(ppa_l2p, ppa_gc))
a4bd217b JG	543	goto out;
a4bd217b JG	544
d340121e	545	rqd->ppa_addr = ppa_l2p;
a4bd217b JG	546	valid_secs = 1;
	547
	548	#ifdef CONFIG_NVM_DEBUG
	549	atomic_long_inc(&pblk->inflight_reads);
	550	#endif
	551
	552	out:
	553	return valid_secs;
	554	}
	555
d340121e	556	int pblk_submit_read_gc(struct pblk pblk, struct pblk_gc_rq gc_rq)
a4bd217b JG	557	{
	558	struct nvm_tgt_dev *dev = pblk->dev;
	559	struct nvm_geo *geo = &dev->geo;
a4bd217b JG	560	struct bio *bio;
a4bd217b JG	561	struct nvm_rq rqd;
d340121e JG	562	int data_len;
d340121e JG	563	int ret = NVM_IO_OK;
a4bd217b JG	564
	565	memset(&rqd, 0, sizeof(struct nvm_rq));
	566
63e3809c JG	567	rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
	568	&rqd.dma_meta_list);
	569	if (!rqd.meta_list)
d340121e	570	return -ENOMEM;
63e3809c	571
d340121e	572	if (gc_rq->nr_secs > 1) {
63e3809c JG	573	rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
63e3809c JG	574	rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;
a4bd217b	575
d340121e JG	576	gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line,
	577	gc_rq->lba_list,
	578	gc_rq->paddr_list,
	579	gc_rq->nr_secs);
	580	if (gc_rq->secs_to_gc == 1)
63e3809c	581	rqd.ppa_addr = rqd.ppa_list[0];
a4bd217b	582	} else {
d340121e JG	583	gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line,
	584	gc_rq->lba_list[0],
	585	gc_rq->paddr_list[0]);
a4bd217b JG	586	}
a4bd217b JG	587
d340121e	588	if (!(gc_rq->secs_to_gc))
a4bd217b JG	589	goto out;
a4bd217b JG	590
e46f4e48	591	data_len = (gc_rq->secs_to_gc) * geo->csecs;
d340121e	592	bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len,
7d327a9e	593	PBLK_VMALLOC_META, GFP_KERNEL);
a4bd217b JG	594	if (IS_ERR(bio)) {
	595	pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio));
	596	goto err_free_dma;
	597	}
	598
	599	bio->bi_iter.bi_sector = 0; /* internal bio */
	600	bio_set_op_attrs(bio, REQ_OP_READ, 0);
	601
	602	rqd.opcode = NVM_OP_PREAD;
d340121e	603	rqd.nr_ppas = gc_rq->secs_to_gc;
f9c10152	604	rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
a4bd217b JG	605	rqd.bio = bio;
a4bd217b JG	606
1a94b2d4	607	if (pblk_submit_io_sync(pblk, &rqd)) {
d340121e	608	ret = -EIO;
a4bd217b	609	pr_err("pblk: GC read request failed\n");
7d327a9e	610	goto err_free_bio;
a4bd217b JG	611	}
a4bd217b JG	612
310df582 JG	613	pblk_read_check_rand(pblk, rqd.meta_list, gc_rq->lba_list, rqd.nr_ppas);
310df582 JG	614
588726d3	615	atomic_dec(&pblk->inflight_io);
a4bd217b JG	616
	617	if (rqd.error) {
	618	atomic_long_inc(&pblk->read_failed_gc);
	619	#ifdef CONFIG_NVM_DEBUG
	620	pblk_print_failed_rqd(pblk, &rqd, rqd.error);
	621	#endif
	622	}
	623
	624	#ifdef CONFIG_NVM_DEBUG
d340121e JG	625	atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads);
	626	atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads);
	627	atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads);
a4bd217b JG	628	#endif
	629
	630	out:
63e3809c	631	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
d340121e	632	return ret;
a4bd217b	633
7d327a9e JG	634	err_free_bio:
7d327a9e JG	635	bio_put(bio);
a4bd217b	636	err_free_dma:
63e3809c	637	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
d340121e	638	return ret;
a4bd217b	639	}