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

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Message-ID: <20180924110047.GO21032@ulmo>
Date:   Mon, 24 Sep 2018 13:00:47 +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 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.

Thierry

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