linux-kernel - [PATCH 1/4] lightnvm: remove nvm_submit_io_sync

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Message-Id: <1564566096-28756-2-git-send-email-hans@owltronix.com>
Date:   Wed, 31 Jul 2019 11:41:33 +0200
From:   Hans Holmberg <hans@...tronix.com>
To:     Matias Bjorling <mb@...htnvm.io>
Cc:     Christoph Hellwig <hch@....de>,
        Javier González <javier@...igon.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Holmberg <hans@...tronix.com>
Subject: [PATCH 1/4] lightnvm: remove nvm_submit_io_sync_fn

Move the redundant sync handling interface and wait for a completion
in the lightnvm core instead.

Signed-off-by: Hans Holmberg <hans@...tronix.com>
---
 drivers/lightnvm/core.c      | 35 +++++++++++++++++++++++++++++------
 drivers/nvme/host/lightnvm.c | 29 -----------------------------
 include/linux/lightnvm.h     |  2 --
 3 files changed, 29 insertions(+), 37 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index a600934fdd9c..01d098fb96ac 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -752,12 +752,36 @@ int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 }
 EXPORT_SYMBOL(nvm_submit_io);
 
+static void nvm_sync_end_io(struct nvm_rq *rqd)
+{
+	struct completion *waiting = rqd->private;
+
+	complete(waiting);
+}
+
+static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+	DECLARE_COMPLETION_ONSTACK(wait);
+	int ret = 0;
+
+	rqd->end_io = nvm_sync_end_io;
+	rqd->private = &wait;
+
+	ret = dev->ops->submit_io(dev, rqd);
+	if (ret)
+		return ret;
+
+	wait_for_completion_io(&wait);
+
+	return 0;
+}
+
 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 {
 	struct nvm_dev *dev = tgt_dev->parent;
 	int ret;
 
-	if (!dev->ops->submit_io_sync)
+	if (!dev->ops->submit_io)
 		return -ENODEV;
 
 	nvm_rq_tgt_to_dev(tgt_dev, rqd);
@@ -765,9 +789,7 @@ int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 	rqd->dev = tgt_dev;
 	rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 
-	/* In case of error, fail with right address format */
-	ret = dev->ops->submit_io_sync(dev, rqd);
-	nvm_rq_dev_to_tgt(tgt_dev, rqd);
+	ret = nvm_submit_io_wait(dev, rqd);
 
 	return ret;
 }
@@ -788,12 +810,13 @@ EXPORT_SYMBOL(nvm_end_io);
 
 static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
 {
-	if (!dev->ops->submit_io_sync)
+	if (!dev->ops->submit_io)
 		return -ENODEV;
 
+	rqd->dev = NULL;
 	rqd->flags = nvm_set_flags(&dev->geo, rqd);
 
-	return dev->ops->submit_io_sync(dev, rqd);
+	return nvm_submit_io_wait(dev, rqd);
 }
 
 static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index ba009d4c9dfa..d6f121452d5d 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -690,34 +690,6 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
 	return 0;
 }
 
-static int nvme_nvm_submit_io_sync(struct nvm_dev *dev, struct nvm_rq *rqd)
-{
-	struct request_queue *q = dev->q;
-	struct request *rq;
-	struct nvme_nvm_command cmd;
-	int ret = 0;
-
-	memset(&cmd, 0, sizeof(struct nvme_nvm_command));
-
-	rq = nvme_nvm_alloc_request(q, rqd, &cmd);
-	if (IS_ERR(rq))
-		return PTR_ERR(rq);
-
-	/* I/Os can fail and the error is signaled through rqd. Callers must
-	 * handle the error accordingly.
-	 */
-	blk_execute_rq(q, NULL, rq, 0);
-	if (nvme_req(rq)->flags & NVME_REQ_CANCELLED)
-		ret = -EINTR;
-
-	rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64);
-	rqd->error = nvme_req(rq)->status;
-
-	blk_mq_free_request(rq);
-
-	return ret;
-}
-
 static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name,
 					int size)
 {
@@ -754,7 +726,6 @@ static struct nvm_dev_ops nvme_nvm_dev_ops = {
 	.get_chk_meta		= nvme_nvm_get_chk_meta,
 
 	.submit_io		= nvme_nvm_submit_io,
-	.submit_io_sync		= nvme_nvm_submit_io_sync,
 
 	.create_dma_pool	= nvme_nvm_create_dma_pool,
 	.destroy_dma_pool	= nvme_nvm_destroy_dma_pool,
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 4d0d5655c7b2..8891647b24b1 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -89,7 +89,6 @@ typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
 typedef int (nvm_get_chk_meta_fn)(struct nvm_dev *, sector_t, int,
 							struct nvm_chk_meta *);
 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
-typedef int (nvm_submit_io_sync_fn)(struct nvm_dev *, struct nvm_rq *);
 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *, int);
 typedef void (nvm_destroy_dma_pool_fn)(void *);
 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
@@ -104,7 +103,6 @@ struct nvm_dev_ops {
 	nvm_get_chk_meta_fn	*get_chk_meta;
 
 	nvm_submit_io_fn	*submit_io;
-	nvm_submit_io_sync_fn	*submit_io_sync;
 
 	nvm_create_dma_pool_fn	*create_dma_pool;
 	nvm_destroy_dma_pool_fn	*destroy_dma_pool;
-- 
2.7.4