This series of patches try to save single pages from CMA area bypassing all CMA single page alloctions and allocating normal pages instead, as all addresses within one single page are contiguous.
We had once applied the PATCH-5 but reverted it as actually not all the callers handled the fallback allocations. Per Robin's suggestion, let's stuff alloc_pages()/free_page() fallbacks to those callers before having PATCH-5. Nicolin Chen (5): ARM: dma-mapping: Add fallback normal page allocations dma-remap: Run alloc_pages() on failure iommu: amd_iommu: Add fallback normal page allocations arm64: dma-mapping: Add fallback normal page allocations dma-contiguous: Do not allocate a single page from CMA area arch/arm/mm/dma-mapping.c | 13 ++++++++++--- arch/arm64/mm/dma-mapping.c | 19 ++++++++++++------- drivers/iommu/amd_iommu.c | 3 +++ kernel/dma/contiguous.c | 22 +++++++++++++++++++--- kernel/dma/remap.c | 2 +- 5 files changed, 45 insertions(+), 14 deletions(-) -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
