1 files changed, 0 insertions, 477 deletions

diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
deleted file mode 100644
index 8efd14e683dc..000000000000
--- a/drivers/lightnvm/pblk-read.c
+++ /dev/null
@@ -1,477 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * 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)
-{
-#ifdef CONFIG_NVM_PBLK_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);
-}
-
-static int pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
-				 struct bio *bio, sector_t blba,
-				 bool *from_cache)
-{
-	void *meta_list = rqd->meta_list;
-	int nr_secs, i;
-
-retry:
-	nr_secs = pblk_lookup_l2p_seq(pblk, rqd->ppa_list, blba, rqd->nr_ppas,
-					from_cache);
-
-	if (!*from_cache)
-		goto end;
-
-	for (i = 0; i < nr_secs; i++) {
-		struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
-		sector_t lba = blba + i;
-
-		if (pblk_ppa_empty(rqd->ppa_list[i])) {
-			__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
-
-			meta->lba = addr_empty;
-		} else if (pblk_addr_in_cache(rqd->ppa_list[i])) {
-			/*
-			 * Try to read from write buffer. The address is later
-			 * checked on the write buffer to prevent retrieving
-			 * overwritten data.
-			 */
-			if (!pblk_read_from_cache(pblk, bio, lba,
-							rqd->ppa_list[i])) {
-				if (i == 0) {
-					/*
-					 * We didn't call with bio_advance()
-					 * yet, so we can just retry.
-					 */
-					goto retry;
-				} else {
-					/*
-					 * We already call bio_advance()
-					 * so we cannot retry and we need
-					 * to quit that function in order
-					 * to allow caller to handle the bio
-					 * splitting in the current sector
-					 * position.
-					 */
-					nr_secs = i;
-					goto end;
-				}
-			}
-			meta->lba = cpu_to_le64(lba);
-#ifdef CONFIG_NVM_PBLK_DEBUG
-			atomic_long_inc(&pblk->cache_reads);
-#endif
-		}
-		bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
-	}
-
-end:
-	if (pblk_io_aligned(pblk, nr_secs))
-		rqd->is_seq = 1;
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
-	atomic_long_add(nr_secs, &pblk->inflight_reads);
-#endif
-
-	return nr_secs;
-}
-
-
-static void pblk_read_check_seq(struct pblk *pblk, struct nvm_rq *rqd,
-				sector_t blba)
-{
-	void *meta_list = rqd->meta_list;
-	int nr_lbas = rqd->nr_ppas;
-	int i;
-
-	if (!pblk_is_oob_meta_supported(pblk))
-		return;
-
-	for (i = 0; i < nr_lbas; i++) {
-		struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
-		u64 lba = le64_to_cpu(meta->lba);
-
-		if (lba == ADDR_EMPTY)
-			continue;
-
-		if (lba != blba + i) {
-#ifdef CONFIG_NVM_PBLK_DEBUG
-			struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
-
-			print_ppa(pblk, &ppa_list[i], "seq", i);
-#endif
-			pblk_err(pblk, "corrupted read LBA (%llu/%llu)\n",
-							lba, (u64)blba + i);
-			WARN_ON(1);
-		}
-	}
-}
-
-/*
- * There can be holes in the lba list.
- */
-static void pblk_read_check_rand(struct pblk *pblk, struct nvm_rq *rqd,
-				 u64 *lba_list, int nr_lbas)
-{
-	void *meta_lba_list = rqd->meta_list;
-	int i, j;
-
-	if (!pblk_is_oob_meta_supported(pblk))
-		return;
-
-	for (i = 0, j = 0; i < nr_lbas; i++) {
-		struct pblk_sec_meta *meta = pblk_get_meta(pblk,
-							   meta_lba_list, j);
-		u64 lba = lba_list[i];
-		u64 meta_lba;
-
-		if (lba == ADDR_EMPTY)
-			continue;
-
-		meta_lba = le64_to_cpu(meta->lba);
-
-		if (lba != meta_lba) {
-#ifdef CONFIG_NVM_PBLK_DEBUG
-			struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
-
-			print_ppa(pblk, &ppa_list[j], "rnd", j);
-#endif
-			pblk_err(pblk, "corrupted read LBA (%llu/%llu)\n",
-							meta_lba, lba);
-			WARN_ON(1);
-		}
-
-		j++;
-	}
-
-	WARN_ONCE(j != rqd->nr_ppas, "pblk: corrupted random request\n");
-}
-
-static void pblk_end_user_read(struct bio *bio, int error)
-{
-	if (error && error != NVM_RSP_WARN_HIGHECC)
-		bio_io_error(bio);
-	else
-		bio_endio(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 *int_bio = rqd->bio;
-	unsigned long start_time = r_ctx->start_time;
-
-	generic_end_io_acct(dev->q, REQ_OP_READ, &pblk->disk->part0, start_time);
-
-	if (rqd->error)
-		pblk_log_read_err(pblk, rqd);
-
-	pblk_read_check_seq(pblk, rqd, r_ctx->lba);
-	bio_put(int_bio);
-
-	if (put_line)
-		pblk_rq_to_line_put(pblk, rqd);
-
-#ifdef CONFIG_NVM_PBLK_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;
-	struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
-	struct bio *bio = (struct bio *)r_ctx->private;
-
-	pblk_end_user_read(bio, rqd->error);
-	__pblk_end_io_read(pblk, rqd, true);
-}
-
-static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, struct bio *bio,
-			 sector_t lba, bool *from_cache)
-{
-	struct pblk_sec_meta *meta = pblk_get_meta(pblk, rqd->meta_list, 0);
-	struct ppa_addr ppa;
-
-	pblk_lookup_l2p_seq(pblk, &ppa, lba, 1, from_cache);
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
-	atomic_long_inc(&pblk->inflight_reads);
-#endif
-
-retry:
-	if (pblk_ppa_empty(ppa)) {
-		__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
-
-		meta->lba = 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)) {
-			pblk_lookup_l2p_seq(pblk, &ppa, lba, 1, from_cache);
-			goto retry;
-		}
-
-		meta->lba = cpu_to_le64(lba);
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
-		atomic_long_inc(&pblk->cache_reads);
-#endif
-	} else {
-		rqd->ppa_addr = ppa;
-	}
-}
-
-void 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);
-	bool from_cache;
-	struct pblk_g_ctx *r_ctx;
-	struct nvm_rq *rqd;
-	struct bio *int_bio, *split_bio;
-
-	generic_start_io_acct(q, REQ_OP_READ, bio_sectors(bio),
-			      &pblk->disk->part0);
-
-	rqd = pblk_alloc_rqd(pblk, PBLK_READ);
-
-	rqd->opcode = NVM_OP_PREAD;
-	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;
-
-	if (pblk_alloc_rqd_meta(pblk, rqd)) {
-		bio_io_error(bio);
-		pblk_free_rqd(pblk, rqd, PBLK_READ);
-		return;
-	}
-
-	/* Clone read bio to deal internally with:
-	 * -read errors when reading from drive
-	 * -bio_advance() calls during cache reads
-	 */
-	int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
-
-	if (nr_secs > 1)
-		nr_secs = pblk_read_ppalist_rq(pblk, rqd, int_bio, blba,
-						&from_cache);
-	else
-		pblk_read_rq(pblk, rqd, int_bio, blba, &from_cache);
-
-split_retry:
-	r_ctx->private = bio; /* original bio */
-	rqd->bio = int_bio; /* internal bio */
-
-	if (from_cache && nr_secs == rqd->nr_ppas) {
-		/* All data was read from cache, we can complete the IO. */
-		pblk_end_user_read(bio, 0);
-		atomic_inc(&pblk->inflight_io);
-		__pblk_end_io_read(pblk, rqd, false);
-	} else if (nr_secs != rqd->nr_ppas) {
-		/* 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. In order to handle this, we will use block layer
-		 * mechanism to split this request in to smaller ones and make
-		 * a chain of it.
-		 */
-		split_bio = bio_split(bio, nr_secs * NR_PHY_IN_LOG, GFP_KERNEL,
-					&pblk_bio_set);
-		bio_chain(split_bio, bio);
-		generic_make_request(bio);
-
-		/* New bio contains first N sectors of the previous one, so
-		 * we can continue to use existing rqd, but we need to shrink
-		 * the number of PPAs in it. New bio is also guaranteed that
-		 * it contains only either data from cache or from drive, newer
-		 * mix of them.
-		 */
-		bio = split_bio;
-		rqd->nr_ppas = nr_secs;
-		if (rqd->nr_ppas == 1)
-			rqd->ppa_addr = rqd->ppa_list[0];
-
-		/* Recreate int_bio - existing might have some needed internal
-		 * fields modified already.
-		 */
-		bio_put(int_bio);
-		int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
-		goto split_retry;
-	} else if (pblk_submit_io(pblk, rqd, NULL)) {
-		/* Submitting IO to drive failed, let's report an error */
-		rqd->error = -ENODEV;
-		pblk_end_io_read(rqd);
-	}
-}
-
-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[NVM_MAX_VLBA];
-	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_PBLK_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->capacity) {
-		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_PBLK_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_rq rqd;
-	int ret = NVM_IO_OK;
-
-	memset(&rqd, 0, sizeof(struct nvm_rq));
-
-	ret = pblk_alloc_rqd_meta(pblk, &rqd);
-	if (ret)
-		return ret;
-
-	if (gc_rq->nr_secs > 1) {
-		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;
-
-	rqd.opcode = NVM_OP_PREAD;
-	rqd.nr_ppas = gc_rq->secs_to_gc;
-
-	if (pblk_submit_io_sync(pblk, &rqd, gc_rq->data)) {
-		ret = -EIO;
-		goto err_free_dma;
-	}
-
-	pblk_read_check_rand(pblk, &rqd, gc_rq->lba_list, gc_rq->nr_secs);
-
-	atomic_dec(&pblk->inflight_io);
-
-	if (rqd.error) {
-		atomic_long_inc(&pblk->read_failed_gc);
-#ifdef CONFIG_NVM_PBLK_DEBUG
-		pblk_print_failed_rqd(pblk, &rqd, rqd.error);
-#endif
-	}
-
-#ifdef CONFIG_NVM_PBLK_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:
-	pblk_free_rqd_meta(pblk, &rqd);
-	return ret;
-
-err_free_dma:
-	pblk_free_rqd_meta(pblk, &rqd);
-	return ret;
-}