linux-kernel - Re: [PATCH v3 10/11] xen/arm: introduce phys/dma translations in xen_dma_sync_for

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Message-ID: <68f244b5-86e7-4c94-7a22-f9ca53311857@suse.com>
Date:   Tue, 4 Aug 2020 07:35:32 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        hch@...radead.org,
        Stefano Stabellini <stefano.stabellini@...inx.com>
Subject: Re: [PATCH v3 10/11] xen/arm: introduce phys/dma translations in
 xen_dma_sync_for_*

On 11.07.20 00:34, Stefano Stabellini wrote:
> From: Stefano Stabellini <stefano.stabellini@...inx.com>
> 
> xen_dma_sync_for_cpu, xen_dma_sync_for_device, xen_arch_need_swiotlb are
> getting called passing dma addresses. On some platforms dma addresses
> could be different from physical addresses. Before doing any operations
> on these addresses we need to convert them back to physical addresses
> using dma_to_phys.
> 
> Move the arch_sync_dma_for_cpu and arch_sync_dma_for_device calls from
> xen_dma_sync_for_cpu/device to swiotlb-xen.c, and add a call dma_to_phys
> to do address translations there.
> 
> dma_cache_maint is fixed by the next patch.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...inx.com>
> Tested-by: Corey Minyard <cminyard@...sta.com>
> Tested-by: Roman Shaposhnik <roman@...eda.com>

Acked-by: Juergen Gross <jgross@...e.com>


Juergen