Will Deacon f8f86b5eec 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 15:32:33 +02:00
..
coherent.c	dma-mapping: clear dev->dma_mem to NULL after freeing it	2023-12-15 12:32:45 +01:00
contiguous.c	Revert "dma-contiguous: check for memory region overlap"	2023-09-08 05:58:32 -03:00
debug.c	dma-mapping fixes for Linux 6.8	2024-01-18 16:49:34 -08:00
debug.h	dma-debug: teach add_dma_entry() about DMA_ATTR_SKIP_CPU_SYNC	2021-10-18 12:46:45 +02:00
direct.c	dma-mapping: don't store redundant offsets	2023-12-15 12:32:42 +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	dma-mapping: return error code from dma_dummy_map_sg()	2021-08-09 17:13:06 +02:00
Kconfig	dma-direct: add a CONFIG_ARCH_HAS_DMA_ALLOC symbol	2023-10-22 16:38:54 +02:00
Makefile	dma-mapping: remove CONFIG_DMA_REMAP	2022-03-03 14:00:57 +03:00
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	dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable}	2021-07-16 11:30:26 +02:00
pool.c	mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER	2024-01-08 15:27:15 -08:00
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 15:32:33 +02:00