linux-kernel - Re: [PATCH 4/5] virtio: Introduce virtio_max_dma

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Date:   Tue, 29 Jan 2019 18:13:34 +0100
From:   Christoph Hellwig <hch@....de>
To:     Joerg Roedel <joro@...tes.org>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jfehlig@...e.com,
        jon.grimm@....com, brijesh.singh@....com, jroedel@...e.de
Subject: Re: [PATCH 4/5] virtio: Introduce virtio_max_dma_size()

On Tue, Jan 29, 2019 at 09:43:41AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> This function returns the maximum segment size for a single
> dma transaction of a virtio device. The possible limit comes
> from the SWIOTLB implementation in the Linux kernel, that
> has an upper limit of (currently) 256kb of contiguous
> memory it can map. Other DMA-API implementations might also
> have limits.
> 
> Use the new dma_max_mapping_size() function to determine the
> maximum mapping size when DMA-API is in use for virtio.
> 
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>