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

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Date:	Fri, 23 May 2014 09:31:59 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	David Airlie <airlied@...ux.ie>,
	Ben Skeggs <bskeggs@...hat.com>, Lucas Stach <dev@...xeye.de>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] drm/ttm: introduce dma cache sync helpers

On Fri, May 23, 2014 at 02:49:40PM +0900, Alexandre Courbot wrote:
> On Mon, May 19, 2014 at 5:33 PM, Thierry Reding
> <thierry.reding@...il.com> wrote:
> > 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.
> 
> Rephrased as "On arches for which access to GPU memory is non-coherent, caches
> need to be flushed and invalidated explicitly at the appropriate places."

Nit: s/arches/architectures/

Thierry

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