linux-kernel - Re: [PATCH v4 10/15] iommu/vt-d: Probe DMA-capable ACPI name space devices

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Message-ID: <20190529061626.GA26055@infradead.org>
Date:   Tue, 28 May 2019 23:16:26 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>, kevin.tian@...el.com,
        ashok.raj@...el.com, dima@...sta.com, tmurphy@...sta.com,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        jacob.jun.pan@...el.com
Subject: Re: [PATCH v4 10/15] iommu/vt-d: Probe DMA-capable ACPI name space
 devices

On Sat, May 25, 2019 at 01:41:31PM +0800, Lu Baolu wrote:
> Some platforms may support ACPI name-space enumerated devices
> that are capable of generating DMA requests. Platforms which
> support DMA remapping explicitly declares any such DMA-capable
> ACPI name-space devices in the platform through ACPI Name-space
> Device Declaration (ANDD) structure and enumerate them through
> the Device Scope of the appropriate remapping hardware unit.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Isn't this something that should be handled through the IOMMU API so
that it covers other IOMMU types as well?

How does this scheme compare to the one implemented in
drivers/acpi/arm64/iort.c?