On Wed, Dec 13, 2006 at 10:15:47PM +0100, Arjan van de Ven wrote:
> with DRI you have the case where "something" needs to do security
> validation of the commands that are sent to the card. (to avoid a
> non-privileged user to DMA all over your memory)
We also have the interesting case where your card is behind an
isolation-capable IOMMU, so if you let userspace program it, you need
a userspace-accessible DMA-API for IOMMU mappings (or to pre-map
everything in the IOMMU, which loses on some of the benefits of
isolation-capable IOMMUs (i.e., only map what you need to use right
now)).
Cheers,
Muli
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