11 Jan
2022
11 Jan
'22
11:02 p.m.
On 2022-01-11 3:57 p.m., Jason Gunthorpe wrote:
On Tue, Jan 11, 2022 at 03:09:13PM -0700, Logan Gunthorpe wrote:
Either that, or we need a wrapper that allocates an appropriately sized SGL to pass to any dma_map implementation that doesn't support the new structures.
This is what I think we should do. If we start with RDMA then we can motivate the 4 main server IOMMU drivers to get updated ASAP, then it can acceptably start to spread to other users.
I suspect the preferred path forward is for the IOMMU drivers that don't use dma-iommu should be converted to use it. Then anything we do to dma-iommu will be applicable to the IOMMU drivers. Better than expecting them to implement a bunch of new functionality themselves.
Logan