Subject: Re: [PATCH 2/3] nvme: implement DMA_ATTR_NO_WARN

From: Gabriel Krisman Bertazi <[email-masked]>
Date: Wed, 06 Jul 2016 21:41:45 -0300

Mauricio Faria de Oliveira <[email-masked]> writes:

> Use the DMA_ATTR_NO_WARN attribute on dma_map_sg() calls of nvme driver.
>
> Signed-off-by: Mauricio Faria de Oliveira <[email-masked]>

checkpatch.pl complains about line wrapping.  Other than that, this
looks good to me.

Reviewed-by: Gabriel Krisman Bertazi <[email-masked]>

> ---
>  drivers/nvme/host/pci.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index d1a8259..c3c3348 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -18,6 +18,7 @@
>  #include <linux/blk-mq.h>
>  #include <linux/cpu.h>
>  #include <linux/delay.h>
> +#include <linux/dma-attrs.h>
>  #include <linux/errno.h>
>  #include <linux/fs.h>
>  #include <linux/genhd.h>
> @@ -65,6 +66,8 @@ MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes");
>
>  static struct workqueue_struct *nvme_workq;
>
> +static DEFINE_DMA_ATTRS(nvme_dma_attrs);
> +
>  struct nvme_dev;
>  struct nvme_queue;
>
> @@ -498,7 +501,7 @@ static int nvme_map_data(struct nvme_dev *dev, struct request *req,
>  		goto out;
>
>  	ret = BLK_MQ_RQ_QUEUE_BUSY;
> -	if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir))
> +	if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir, &nvme_dma_attrs))
>  		goto out;
>
>  	if (!nvme_setup_prps(dev, req, size))
> @@ -516,7 +519,7 @@ static int nvme_map_data(struct nvme_dev *dev, struct request *req,
>  		if (rq_data_dir(req))
>  			nvme_dif_remap(req, nvme_dif_prep);
>
> -		if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
> +		if (!dma_map_sg_attrs(dev->dev, &iod->meta_sg, 1, dma_dir, &nvme_dma_attrs))
>  			goto out_unmap;
>  	}
>
> @@ -2118,6 +2121,9 @@ static int __init nvme_init(void)
>  	result = pci_register_driver(&nvme_driver);
>  	if (result)
>  		destroy_workqueue(nvme_workq);
> +
> +	dma_set_attr(DMA_ATTR_NO_WARN, &nvme_dma_attrs);
> +
>  	return result;
>  }

-- 
Gabriel Krisman Bertazi