Will Deacon 18c288992d swiotlb: Fix alignment checks when both allocation and DMA masks are present ... [ Upstream commit 51b30ecb73 ] Nicolin reports that swiotlb buffer allocations fail for an NVME device behind an IOMMU using 64KiB pages. This is because we end up with a minimum allocation alignment of 64KiB (for the IOMMU to map the buffer safely) but a minimum DMA alignment mask corresponding to a 4KiB NVME page (i.e. preserving the 4KiB page offset from the original allocation). If the original address is not 4KiB-aligned, the allocation will fail because swiotlb_search_pool_area() erroneously compares these unmasked bits with the 64KiB-aligned candidate allocation. Tweak swiotlb_search_pool_area() so that the DMA alignment mask is reduced based on the required alignment of the allocation. Fixes: 82612d66d5 ("iommu: Allow the dma-iommu api to use bounce buffers") Link: https://lore.kernel.org/r/cover.1707851466.git.nicolinc@nvidia.com Reported-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Will Deacon <will@kernel.org> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Tested-by: Michael Kelley <mhklinux@outlook.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-03 15:11:43 +02:00
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Kconfig	dma-direct: add a CONFIG_ARCH_HAS_DMA_ALLOC symbol	2023-10-22 16:38:54 +02:00
Makefile	…
coherent.c	dma-mapping: clear dev->dma_mem to NULL after freeing it	2024-01-25 15:44:53 -08:00
contiguous.c	Revert "dma-contiguous: check for memory region overlap"	2023-09-08 05:58:32 -03:00
debug.c	dma-debug: Fix a typo in a debugging eye-catcher	2023-10-23 07:52:54 +02:00
debug.h	…
direct.c	dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM	2023-11-06 08:38:16 +01:00
direct.h	dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM	2023-11-06 08:38:16 +01:00
dummy.c	…
map_benchmark.c	dma-mapping: benchmark: remove MODULE_LICENSE in non-modules	2023-04-13 13:13:51 -07:00
mapping.c	dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM	2023-11-06 08:38:16 +01:00
ops_helpers.c	…
pool.c	dma-pool: remove a __maybe_unused label in atomic_pool_expand	2023-08-31 14:12:37 +02:00
remap.c	dma-remap: use kvmalloc_array/kvfree for larger dma memory remap	2023-06-07 15:06:28 +02:00
swiotlb.c	swiotlb: Fix alignment checks when both allocation and DMA masks are present	2024-04-03 15:11:43 +02:00