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Drivers have no business looking into dma-mapping internals and check what backend is used. Unfortunstely the DRM core is still broken and tries to do plain page allocations instead of using DMA API allocators by default and uses various bandaids on when to use dma_alloc_coherent. Switch nouveau to use the same (broken) scheme as amdgpu and radeon to remove the last driver user of is_swiotlb_active...

...first bad commit commit 0a2f6372a43ff5e948b8b10be34d4473f6c2ef6c Author: Christoph Hellwig <hch at lst.de> Date:?? Fri Apr 7 08:31:30 2023 +0200 ??? drm/nouveau: stop using is_swiotlb_active ??? Drivers have no business looking into dma-mapping internals and check ??? what backend is used.? Unfortunstely the DRM core is still broken and ??? tries to do plain page allocations instead of using DMA API allocators ??? by default and uses various bandaids on when to use dma_alloc_coherent. ??? Switch nouveau to use the same (broken) scheme as amdgpu and radeon ??? to remove the last driver user of i...

Hi all, this little series removes the last swiotlb API exposed to modules. Diffstat: arch/x86/include/asm/xen/swiotlb-xen.h | 6 ------ arch/x86/kernel/pci-dma.c | 28 ++++------------------------ drivers/gpu/drm/nouveau/nouveau_ttm.c | 10 +++------- drivers/pci/xen-pcifront.c | 6 ------ kernel/dma/swiotlb.c | 1 - 5 files changed, 7