remove the lightnvm subsystem

Lightnvm supports the OCSSD 1.x and 2.0 specs which were early attempts
to produce Open Channel SSDs and never made it into the NVMe spec
proper.  They have since been superceeded by NVMe enhancements such
as ZNS support.  Remove the support per the deprecation schedule.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210812132308.38486-1-hch@lst.de
Reviewed-by: Matias Bjørling <mb@lightnvm.io>
Reviewed-by: Javier González <javier@javigon.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 0 insertions, 474 deletions

diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
deleted file mode 100644
index c28537a489bc..000000000000
--- a/drivers/lightnvm/pblk-read.c
+++ /dev/null
@@ -1,474 +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 pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
-	struct bio *int_bio = rqd->bio;
-	unsigned long start_time = r_ctx->start_time;
-
-	bio_end_io_acct(int_bio, 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)
-{
-	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;
-	unsigned long start_time;
-
-	start_time = bio_start_io_acct(bio);
-
-	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 = start_time;
-	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);
-		submit_bio_noacct(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;
-}