From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v4 18/20] iommu/tegra: gart: Don't detach devices from
	inactive domains
Date: Tue, 25 Sep 2018 16:41:55 +0300
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To: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jonathan Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
List-Id: linux-tegra@vger.kernel.org

On 9/25/18 1:04 PM, Thierry Reding wrote:
> On Mon, Sep 24, 2018 at 09:05:48PM +0300, Dmitry Osipenko wrote:
>> On 9/24/18 2:00 PM, Thierry Reding wrote:
>>> On Mon, Sep 24, 2018 at 03:41:51AM +0300, Dmitry Osipenko wrote:
>>>> There could be unlimited number of allocated domains, but only one domain
>>>> can be active at a time. Hence devices must be detached only from the
>>>> active domain.
>>>>
>>>> Signed-off-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>>>> ---
>>>>  drivers/iommu/tegra-gart.c | 8 +++++---
>>>>  1 file changed, 5 insertions(+), 3 deletions(-)
>>>
>>> Do we have a mechanism of switching out different domains? I don't think
>>> we do, so I'm wondering if perhaps a better solution to this would be to
>>> just refuse to create more than one domain in the first place. That
>>> would also allow us to get rid of the global variable gart_handle.
>>
>> That's what was done in v1, Robin Murphy suggested that it will be
>> better not to restrict allocation of unpopulated domains. It is
>> mentioned in the changelog, see comment to v2 changes.
> 
> Okay, fine.

Thanks, taking as ACK.