linux-kernel - Re: [PATCH 2/4] drm/ttm: introduce dma cache sync helpers

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Date:	Mon, 19 May 2014 10:33:56 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	David Airlie <airlied@...ux.ie>, Ben Skeggs <bskeggs@...hat.com>,
	Lucas Stach <dev@...xeye.de>, nouveau@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, gnurou@...il.com
Subject: Re: [PATCH 2/4] drm/ttm: introduce dma cache sync helpers

On Mon, May 19, 2014 at 04:10:56PM +0900, Alexandre Courbot wrote:
> From: Lucas Stach <dev@...xeye.de>
> 
> On arches with non-coherent PCI,

I guess since this applies to gk20a

> we need to flush caches ourselfes at

"ourselves". Or perhaps even reword to something like: "..., caches need
to be flushed and invalidated explicitly", since dma_sync_for_cpu() does
invalidate rather than flush.

> the appropriate places. Introduce two small helpers to make things easy
> for TTM based drivers.
> 
> Signed-off-by: Lucas Stach <dev@...xeye.de>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  drivers/gpu/drm/ttm/ttm_tt.c    | 25 +++++++++++++++++++++++++
>  include/drm/ttm/ttm_bo_driver.h | 28 ++++++++++++++++++++++++++++
>  2 files changed, 53 insertions(+)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
[...]
> +void ttm_dma_tt_cache_sync_for_device(struct ttm_dma_tt *ttm_dma,
> +				      struct device *dev)
> +{
> +	int i;

This should probably be unsigned long to match the type of
ttm_dma->ttm.num_pages.

Thierry

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