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

Christoph Hellwig hch at lst.de
Wed Apr 6 09:10:31 PDT 2022


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?



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