linux-kernel - Re: [PATCH v4 15/20] iommu/tegra: gart: Allow only one active domain at a time

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Date:   Mon, 24 Sep 2018 12:50:43 +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 15/20] iommu/tegra: gart: Allow only one active domain
 at a time

On Mon, Sep 24, 2018 at 03:41:48AM +0300, Dmitry Osipenko wrote:
> GART has a single address space that is shared by all devices, hence only
> one domain could be active at a time.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/iommu/tegra-gart.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
> index 1d45b023adea..9f7d3afb686f 100644
> --- a/drivers/iommu/tegra-gart.c
> +++ b/drivers/iommu/tegra-gart.c
> @@ -55,6 +55,7 @@ struct gart_device {
>  	spinlock_t		pte_lock;	/* for pagetable */
>  	struct list_head	client;
>  	spinlock_t		client_lock;	/* for client list */
> +	struct iommu_domain	*active_domain;	/* current active domain */

The active_ prefix seems a little unnecessary here, but either way:

Acked-by: Thierry Reding <treding@...dia.com>

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