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

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Date:   Wed, 31 Jul 2019 15:54:15 +0200
From:   Javier González <javier@...igon.com>
To:     Hans Holmberg <hans@...tronix.com>
Cc:     Matias Bjørling <mb@...htnvm.io>,
        Christoph Hellwig <hch@....de>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] lightnvm: remove nvm_submit_io_sync_fn

> On 31 Jul 2019, at 11.41, Hans Holmberg <hans@...tronix.com> wrote:
> 
> 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

Looks good to me. Thanks Hans.

Reviewed-by: Javier González <javier@...igon.com>


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