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dma-mapping fixes for Linux 7.3

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Two more fixes for the corner cases in the DMA-mapping SWIOTLB code
 (Peng Fan and Marek Szyprowski).
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Merge tag 'dma-mapping-7.3-2026-10-09' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux

Pull dma-mapping fixes from Marek Szyprowski:
 "Two more fixes for the corner cases in the DMA-mapping SWIOTLB code
  (Peng Fan and Marek Szyprowski)"

* tag 'dma-mapping-7.3-2026-10-09' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux:
  swiotlb: fix default_swiotlb_limit() for non-growable default pool
  iommu/dma: skip swiotlb bounce for DMA_ATTR_MMIO in iommu_dma_map_phys
This commit is contained in:
Linus Torvalds 2026-10-10 00:49:55 +02:00
commit c8d4256f10
2 changed files with 5 additions and 5 deletions
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4
drivers/iommu/dma-iommu.c
View File

@ -1228,9 +1228,9 @@ dma_addr_t iommu_dma_map_phys(struct device *dev, phys_addr_t phys, size_t size,
* If both the physical buffer start address and size are page aligned,
* we don't need to use a bounce page.
*/
if (dev_use_swiotlb(dev, size, dir) &&
if (!(attrs & DMA_ATTR_MMIO) && dev_use_swiotlb(dev, size, dir) &&
iova_unaligned(iovad, phys, size)) {
if (attrs & (DMA_ATTR_MMIO | DMA_ATTR_REQUIRE_COHERENT))
if (attrs & DMA_ATTR_REQUIRE_COHERENT)
return DMA_MAPPING_ERROR;
phys = iommu_dma_map_swiotlb(dev, phys, size, dir, attrs);

6
kernel/dma/swiotlb.c
View File

@ -1844,10 +1844,10 @@ phys_addr_t default_swiotlb_base(void)
phys_addr_t default_swiotlb_limit(void)
{
#ifdef CONFIG_SWIOTLB_DYNAMIC
return io_tlb_default_mem.phys_limit;
#else
return io_tlb_default_mem.defpool.end - 1;
if (io_tlb_default_mem.can_grow)
return io_tlb_default_mem.phys_limit;
#endif
return io_tlb_default_mem.defpool.end - 1;
}
#ifdef CONFIG_DEBUG_FS