On 2021-07-16 07:24, Christoph Hellwig wrote:
On Wed, Jul 14, 2021 at 07:19:50PM +0100, Robin Murphy wrote:
Even at the DMA API level you could hide *some* of it (at the cost of
effectively only having 1/4 of the usable address space), but there are
still cases like where v4l2 has a hard require
On Wed, Jul 14, 2021 at 07:19:50PM +0100, Robin Murphy wrote:
> Even at the DMA API level you could hide *some* of it (at the cost of
> effectively only having 1/4 of the usable address space), but there are
> still cases like where v4l2 has a hard requirement that a page-aligned
> scatterlist can
On Wed, Jul 14, 2021 at 10:51:34PM +0200, Arnd Bergmann wrote:
> The question is how we can best allow one but not the other.
By only allowing to allocate domains of type IDENTITY and DMA, but fail
to allocate UNMANAGED domains.
Regards,
Joerg
On Wed, Jul 14, 2021 at 8:21 PM Robin Murphy wrote:
>
> On 2021-06-27 15:34, Sven Peter wrote:
> [...]
> > In the long term, I'd like to extend the dma-iommu framework itself to
> > support iommu pagesizes with a larger granule than the CPU pagesize if that
> > is
> > something you agree with.
>
On 2021-06-27 15:34, Sven Peter wrote:
[...]
In the long term, I'd like to extend the dma-iommu framework itself to
support iommu pagesizes with a larger granule than the CPU pagesize if that is
something you agree with.
BTW this isn't something we can fully support in general. IOMMU API
users
