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From: Thierry Reding <thierry.reding@gmail.com>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] gpu: host1x: Acquire a reference to the IOVA cache
Date: Mon, 14 May 2018 12:57:54 +0200	[thread overview]
Message-ID: <20180514105754.GE18312@ulmo> (raw)
In-Reply-To: <bf3e90f5-8111-6035-1313-e43fb5bd6baa@gmail.com>


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On Mon, May 14, 2018 at 01:34:27PM +0300, Dmitry Osipenko wrote:
> On 14.05.2018 13:13, Thierry Reding wrote:
> > From: Thierry Reding <treding@nvidia.com>
> > 
> > The IOVA API uses a memory cache to allocate IOVA nodes from. To make
> > sure that this cache is available, obtain a reference to it and release
> > the reference when the cache is no longer needed.
> > 
> > On 64-bit ARM this is hidden by the fact that the DMA mapping API gets
> > that reference and never releases it. On 32-bit ARM, this is papered
> > over by the Tegra DRM driver (the sole user of the host1x API requiring
> > the cache) acquiring a reference to the IOVA cache for its own purposes.
> > However, there may be additional users of this API in the future, so fix
> > this upfront to avoid surprises.
> > 
> > Fixes: 404bfb78daf3 ("gpu: host1x: Add IOMMU support")
> > Signed-off-by: Thierry Reding <treding@nvidia.com>
> > ---
> >  drivers/gpu/host1x/dev.c | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)

Applied, thanks.

Thierry

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      reply	other threads:[~2018-05-14 10:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-14 10:13 [PATCH] gpu: host1x: Acquire a reference to the IOVA cache Thierry Reding
2018-05-14 10:34 ` Dmitry Osipenko
2018-05-14 10:57   ` Thierry Reding [this message]

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