On 17/08/18 08:24, Christoph Hellwig wrote:
I plan to make the arm iommu dma ops generic and move them to
drivers/iommu for the 4.20 merge window.
You mean 32-bit arm? The only place that code should move to is
/dev/null ;) - the plan has always been to convert it to use groups and
default domains so it can just plug iommu-dma in. The tricky bit is
either weaning the users of the private arm_iommu_*() API onto generic
IOMMU API usage, or at least implementing transitional wrappers in a way
that doesn't break anything.
Because of that it would
be great to create a stable branch or even pull this in through
the dma-mapping tree entirely.
FWIW I might still need to tweak the first patch depending on how we
choose to resolve the interaction between DMA ops and unmanaged
domains[1] - if we want to add fallback paths to iommu-dma instead of
swizzling device ops then the assumptions for this hook change and it
will need to reference group->domain rather than group->default_domain.
Robin.
[1]
https://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg230275.html
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