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

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Date: Mon, 20 May 2024 19:11:06 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Robin Murphy <robin.murphy@....com>, 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>,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 5/7] iommu/dma: Make limit checks self-contained

Hi Robin,

On 17/05/2024 16:03, Robin Murphy wrote:

..

> Thanks. From staring at the code I think I've spotted one subtlety which
> may not be quite as intended - can you see if the diff below helps? It
> occurs to me that suspend and CPU hotplug may not *cause* the symptom,
> but they could certainly stall if one or more relevant CPUs is *already*
> stuck in a loop somewhere...
> 
> Thanks,
> Robin.
> 
> ----->8-----
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index 89a53c2f2cf9..85eb1846c637 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -686,6 +686,7 @@ static int iommu_dma_init_domain(struct iommu_domain 
> *domain, struct device *dev
>       /* Check the domain allows at least some access to the device... */
>       if (map) {
>           dma_addr_t base = dma_range_map_min(map);
> +        base = max(base, (dma_addr_t)1 << order);
>           if (base > domain->geometry.aperture_end ||
>               dma_range_map_max(map) < domain->geometry.aperture_start) {
>               pr_warn("specified DMA range outside IOMMU capability\n");

That fixes it for me!

Tested-by: Jon Hunter <jonathanh@...dia.com>

Thanks!
Jon

-- 
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