From: Janne Grunau <j@jannau.net>
To: Sven Peter <sven@kernel.org>
Cc: Neal Gompa <neal@gompa.dev>,
"Joerg Roedel (AMD)" <joro@8bytes.org>,
Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
iommu@lists.linux.dev, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, Hector Martin <marcan@marcan.st>
Subject: Re: [PATCH v2 2/2] iommu: apple-dart: Support specifying the DMA aperture in the DT
Date: Wed, 2 Sep 2026 21:17:50 +0200 [thread overview]
Message-ID: <20260902191750.GA2760037@robin.jannau.net> (raw)
In-Reply-To: <2b95fa20-22a5-4ef2-9ea6-c6fb7d1f16ac@kernel.org>
On Tue, Sep 01, 2026 at 10:45:52PM +0200, Sven Peter wrote:
> Hi,
>
> On 8/31/26 15:46, Janne Grunau wrote:
> > Apple DARTs are often connected directly to devices that expect only a
> > portion of their address space to be used for DMA (for example, because
> > other ranges are mapped directly to something else). Devices can specify
> > the start and end of the aperture via "iommus" args if the DART device
> > node specifies "#iommu-cells = <5>. Aperture start and length are 64-bit
> > values as apertures above and larger than 4GB are used.
> > Limit compile testing to 64-bit architectures to avoid warnings in the
> > calculation of 64-bit dma_addr_t values.
>
> I don't see any Kconfig hunk below, did you drop it by accident?
yes, I accidentally removed the Kconfig change and then confused myself
with the `b4 prep --compare-to v1` into thinking I added it.
> Otherwise:
>
> Reviewed-by: Sven Peter <sven@kernel.org>
thanks
Janne
next prev parent reply other threads:[~2026-09-02 19:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-31 13:46 [PATCH v2 0/2] iommu: apple-dart: device specific DMA aperture support Janne Grunau
2026-08-31 13:46 ` [PATCH v2 1/2] dt-bindings: iommu: dart: Support specifying the DMA aperture Janne Grunau
2026-08-31 13:46 ` [PATCH v2 2/2] iommu: apple-dart: Support specifying the DMA aperture in the DT Janne Grunau
2026-08-31 16:29 ` sashiko-bot
2026-09-01 20:45 ` Sven Peter
2026-09-02 19:17 ` Janne Grunau [this message]
2026-09-24 11:34 ` [PATCH v2 0/2] iommu: apple-dart: device specific DMA aperture support Joerg Roedel (AMD)
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