linux-kernel - Re: [RFC PATCH v1 04/15] iommu: Add DOMAIN_ATTR

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Message-ID: <20190318095321.GA5417@8bytes.org>
Date:   Mon, 18 Mar 2019 10:53:21 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Jordan Crouse <jcrouse@...eaurora.org>
Cc:     freedreno@...ts.freedesktop.org, jean-philippe.brucker@....com,
        linux-arm-msm@...r.kernel.org, dianders@...omimum.org,
        hoegsberg@...gle.com, baolu.lu@...ux.intel.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 04/15] iommu: Add DOMAIN_ATTR_PTBASE

On Fri, Mar 01, 2019 at 12:38:26PM -0700, Jordan Crouse wrote:
> Add an attribute to return the base address of the pagetable. This is used
> by auxiliary domains from arm-smmu to return the address of the pagetable
> to the leaf driver so that it can set the appropriate pagetable through
> it's own means.

What is this going to be used for? Page-table management is supposed to
happen in the arm-smmu driver and the gpu driver only makes changes
through iommu_map/iommu_unmap calls.


Regards,

	Joerg