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Date: Mon, 3 Jun 2024 20:46:48 +0100
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Subject: Re: [PATCH v4 5/7] iommu/dma: Make limit checks self-contained
To: Jens Glathe <jens.glathe@oldschoolsolutions.biz>,
 Joerg Roedel <joro@8bytes.org>, Christoph Hellwig <hch@lst.de>
Cc: Vineet Gupta <vgupta@kernel.org>, Russell King <linux@armlinux.org.uk>,
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 <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>,
 Lorenzo Pieralisi <lpieralisi@kernel.org>, Hanjun Guo
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 Marek Szyprowski <m.szyprowski@samsung.com>, Jason Gunthorpe <jgg@ziepe.ca>,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-acpi@vger.kernel.org, iommu@lists.linux.dev,
 devicetree@vger.kernel.org, Jason Gunthorpe <jgg@nvidia.com>
References: <cover.1713523152.git.robin.murphy@arm.com>
 <e28a114243d1e79eb3609aded034f8529521333f.1713523152.git.robin.murphy@arm.com>
 <aeb13631-7504-4c3c-ba7b-812bf121a60f@oldschoolsolutions.biz>
From: Robin Murphy <robin.murphy@arm.com>
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Hi Jens,

On 2024-06-03 8:37 pm, Jens Glathe wrote:
> Hi Robin,
> 
> an observation from 6.10-rc1: On sc8280xp (Lenovo X13s, Windows Dev Kit
> 2023), when booted to EL2 with the arm-smmuv3 under control of Linux, it
> fails to set up DMA transfers to nvme. My box boots from nvme, so I only
> got a black screen. @craftyguy booted from USB, and got this:

Indeed, I see there's a dma-ranges property with a base of 0 in that DT, 
so all manner of hilarity may ensue. The fix is here, just waiting to be 
picked up:

https://lore.kernel.org/linux-iommu/159193e80b6a7701c61b32d6119ac68989d457bd.1716997607.git.robin.murphy@arm.com/

Thanks,
Robin.