Re: [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY with dev_is_dma_coherent()

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To: Jason Gunthorpe <jgg@xxxxxxxxxx>
Subject: Re: [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY with dev_is_dma_coherent()
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 6 Apr 2022 17:50:56 +0200
Cc: Nelson Escobar <neescoba@xxxxxxxxx>, Matthew Rosato <mjrosato@xxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Will Deacon <will@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, linux-s390@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, Joerg Roedel <joro@xxxxxxxxxx>, Rob Clark <robdclark@xxxxxxxxx>, Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, linux-arm-msm@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, Cornelia Huck <cohuck@xxxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Christian Benvenuti <benve@xxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
In-reply-to: <20220406151823.GG2120790@nvidia.com>
References: <1-v1-ef02c60ddb76+12ca2-intel_no_snoop_jgg@nvidia.com> <db5a6daa-bfe9-744f-7fc5-d5167858bc3e@arm.com> <20220406142432.GF2120790@nvidia.com> <20220406151823.GG2120790@nvidia.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Wed, Apr 06, 2022 at 12:18:23PM -0300, Jason Gunthorpe wrote:
> > Oh, I didn't know about device_get_dma_attr()..

Which is completely broken for any non-OF, non-ACPI plaform.
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References:
- Re: [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY with dev_is_dma_coherent()
  - From: Robin Murphy

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