linux-kernel - Re: [PATCH rdma-next 2/2] RDMA: Use dma_map

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Date:   Tue, 22 Jun 2021 10:18:16 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>, Christoph Hellwig <hch@....de>,
        Maor Gottlieb <maorg@...dia.com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Zhu Yanjun <zyjzyj2000@...il.com>
Subject: Re: [PATCH rdma-next 2/2] RDMA: Use dma_map_sgtable for map umem
 pages

On Tue, Jun 22, 2021 at 02:39:42PM +0300, Leon Romanovsky wrote:

> diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
> index 0eb40025075f..a76ef6a6bac5 100644
> +++ b/drivers/infiniband/core/umem.c
> @@ -51,11 +51,11 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
>  	struct scatterlist *sg;
>  	unsigned int i;
>  
> -	if (umem->nmap > 0)
> -		ib_dma_unmap_sg(dev, umem->sg_head.sgl, umem->sg_nents,
> -				DMA_BIDIRECTIONAL);
> +	if (dirty)
> +		ib_dma_unmap_sgtable_attrs(dev, &umem->sg_head,
> +					   DMA_BIDIRECTIONAL, 0);
>  
> -	for_each_sg(umem->sg_head.sgl, sg, umem->sg_nents, i)
> +	for_each_sgtable_dma_sg(&umem->sg_head, sg, i)
>  		unpin_user_page_range_dirty_lock(sg_page(sg),
>  			DIV_ROUND_UP(sg->length, PAGE_SIZE), make_dirty);

This isn't right, can't mix sg_page with a _dma_ API

Jason