linux-kernel - Re: [PATCH v4 5/7] iommu/dma: Make limit checks self-contained

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Date: Mon, 3 Jun 2024 20:46:48 +0100
From: Robin Murphy <robin.murphy@....com>
To: Jens Glathe <jens.glathe@...schoolsolutions.biz>,
 Joerg Roedel <joro@...tes.org>, Christoph Hellwig <hch@....de>
Cc: Vineet Gupta <vgupta@...nel.org>, Russell King <linux@...linux.org.uk>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Hanjun Guo
 <guohanjun@...wei.com>, Sudeep Holla <sudeep.holla@....com>,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>,
 Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
 David Woodhouse <dwmw2@...radead.org>, Lu Baolu <baolu.lu@...ux.intel.com>,
 Niklas Schnelle <schnelle@...ux.ibm.com>,
 Matthew Rosato <mjrosato@...ux.ibm.com>,
 Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>,
 Rob Herring <robh+dt@...nel.org>, Frank Rowand <frowand.list@...il.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>, Jason Gunthorpe <jgg@...pe.ca>,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-acpi@...r.kernel.org, iommu@...ts.linux.dev,
 devicetree@...r.kernel.org, Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH v4 5/7] iommu/dma: Make limit checks self-contained

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.