linux-kernel - Re: [PATCH v4 18/20] iommu/tegra: gart: Don't detach devices from inactive domains

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Message-ID: <20180925100424.GG7097@ulmo>
Date:   Tue, 25 Sep 2018 12:04:24 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 18/20] iommu/tegra: gart: Don't detach devices from
 inactive domains

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@...il.com>
> >> ---
> >>  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.

Thierry

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