Hi! Sorry about the slow reply to this, been busy with a bunch of other pressing nouveau work lately. Anyway, the steps look pretty simple here so I can see if I can write up a patch shortly :) On Mon, 2022-07-11 at 10:26 +0200, Christoph Hellwig wrote: > Hi i915 and nouveau maintainers, > > any chance I could get some help to remove the remaining direct > driver calls into swiotlb, namely swiotlb_max_segment and > is_swiotlb_active. Either should not matter to a driver as they > should be written to the DMA API. > > In the i915 case it seems like the driver should use > dma_alloc_noncontiguous and/or dma_alloc_noncoherent to allocate > DMAable memory instead of using alloc_page and the streaming > dma mapping helpers. > > For the latter it seems like it should just stop passing > use_dma_alloc == true to ttm_device_init and/or that function > should switch to use dma_alloc_noncoherent. > -- Cheers, Lyude Paul (she/her) Software Engineer at Red Hat
