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

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Date:	Tue, 24 Jun 2014 11:02:20 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	David Airlie <airlied@...ux.ie>, Ben Skeggs <bskeggs@...hat.com>,
	Lucas Stach <dev@...xeye.de>,
	Thierry Reding <thierry.reding@...il.com>, gnurou@...il.com,
	nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] drm/ttm: introduce dma cache sync helpers

On Tue, Jun 24, 2014 at 06:54:26PM +0900, Alexandre Courbot wrote:
> From: Lucas Stach <dev@...xeye.de>
> 
> 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.

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