Re: [PATCH v2 2/3] drm/ttm: introduce dma cache sync helpers

[Alexandre Courbot]

On 06/24/2014 07:02 PM, Russell King - ARM Linux wrote:
> On Tue, Jun 24, 2014 at 06:54:26PM +0900, Alexandre Courbot wrote:
> > From: Lucas Stach <dev@xxxxxxxxxx>
> >
> > On architectures for which access to GPU memory is non-coherent,
> > caches need to be flushed and invalidated explicitly at the
> > appropriate places. Introduce two small helpers to make things
> > easy for TTM-based drivers.
>
> Have you run this with DMA API debugging enabled?  I suspect you haven't,
> and I recommend that you do.

# cat /sys/kernel/debug/dma-api/error_count
162621

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