On Wed, Dec 04, 2019 at 12:42:32PM -0800, Ram Pai wrote: > > The other approach we could use for that - which would still allow > > H_PUT_TCE_INDIRECT, would be to allocate the TCE buffer page from the > > same pool that we use for the bounce buffers. I assume there must > > already be some sort of allocator for that? > > The allocator for swiotlb is buried deep in the swiotlb code. It is > not exposed to the outside-swiotlb world. Will have to do major surgery > to expose it.
I don't think it would require all that much changes, but I'd really hate the layering of calling into it directly. Do we have a struct device associated with the iommu that doesn't get iommu translations themselves? If we do a dma_alloc_coherent on that you'll get the memory pool for free.
