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

Christoph Hellwig
2022-04-06T17:58:12Z

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?