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Wed, 2 Sep 2026 15:17:52 -0400 (EDT) Date: Wed, 2 Sep 2026 21:17:50 +0200 From: Janne Grunau To: Sven Peter Cc: Neal Gompa , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , Rob Herring , Krzysztof Kozlowski , Conor Dooley , 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 Subject: Re: [PATCH v2 2/2] iommu: apple-dart: Support specifying the DMA aperture in the DT Message-ID: <20260902191750.GA2760037@robin.jannau.net> References: <20260831-iommu-apple-dart-aperture-v2-0-d16ce3770299@jannau.net> <20260831-iommu-apple-dart-aperture-v2-2-d16ce3770299@jannau.net> <2b95fa20-22a5-4ef2-9ea6-c6fb7d1f16ac@kernel.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline 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 thanks Janne