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Date:   Wed, 6 Apr 2022 18:10:31 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Jason Gunthorpe <jgg@nvidia.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Robin Murphy <robin.murphy@arm.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Christian Benvenuti <benve@cisco.com>,
        Cornelia Huck <cohuck@redhat.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
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        Matthew Rosato <mjrosato@linux.ibm.com>,
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        Rob Clark <robdclark@gmail.com>,
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        virtualization@lists.linux-foundation.org,
        Will Deacon <will@kernel.org>,
        "Tian, Kevin" <kevin.tian@intel.com>
Subject: Re: [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY
 with dev_is_dma_coherent()
Message-ID: <20220406161031.GA31790@lst.de>
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> <20220406155056.GA30433@lst.de> <20220406160623.GI2120790@nvidia.com>
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On Wed, Apr 06, 2022 at 01:06:23PM -0300, Jason Gunthorpe wrote:
> On Wed, Apr 06, 2022 at 05:50:56PM +0200, Christoph Hellwig wrote:
> > 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.
> 
> I saw that, but I spent some time searching and could not find an
> iommu driver that would load independently of OF or ACPI. ie no IOMMU
> platform drivers are created by board files. Things like Intel/AMD
> discover only from ACPI, etc.

s390?