dma mapping helpers · Supported

Maintainers

• M Marek Szyprowski <m.szyprowski@samsung.com>
• R Robin Murphy <robin.murphy@arm.com>

Paths

• F include/asm-generic/dma-mapping.h
• F include/linux/dma-direct.h
• F include/linux/dma-map-ops.h
• F include/linux/dma-mapping.h
• F include/linux/swiotlb.h
• F kernel/dma/

Last 30 days

Active reviewers (last 30 days)

• Rob Herring <robh@kernel.org>
  1 attestation (1 Suggested-by) · last on 2026-06-30
• Meijing Zhao <hidden>
  1 attestation (1 Tested-by) · last on 2026-06-30
• Marek Szyprowski <m.szyprowski@samsung.com>
  1 attestation (1 Acked-by) · last on 2026-06-30

Recent patches

Most-recent 30 patches in this subsystem on linux-devicetree (capped at 30), ordered by date desc.

• HOTtoday [PATCH v3 06/11] mm/cma: Allow dynamically creating CMA areas
  2026-07-01 · Thierry Reding <thierry.reding@kernel.org>
• COOLING8d REVIEWED: 9 (8M) [PATCH v4 05/10] of: reserved_mem: add dumpable flag to opt-in vmcore
  2026-06-30 · Wandun Chen <hidden>
• COOLING12d REVIEWED: 9 (8M) [PATCH v3 06/11] of: reserved_mem: add dumpable flag to opt-in vmcore
  2026-05-27 · Wandun Chen <hidden>
• COLD47d REVIEWED: 1 (0M) [PATCH v2 3/8] of: reserved_mem: add dumpable flag to opt-in vmcore
  2026-05-20 · Wandun Chen <hidden>
• STALE104d [PATCH v3 4/7] of: reserved_mem: replace CMA quirks by generic methods
  2026-03-25 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE104d [PATCH v3 3/7] of: reserved_mem: switch to ops based OF_DECLARE()
  2026-03-25 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE104d [PATCH v3 2/7] of: reserved_mem: use -ENODEV instead of -ENOENT
  2026-03-25 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE104d [PATCH v3 1/7] of: reserved_mem: remove fdt node from the structure
  2026-03-25 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE105d [PATCH v2 4/7] of: reserved_mem: replace CMA quirks by generic methods
  2026-03-23 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE105d [PATCH v2 1/7] of: reserved_mem: remove fdt node from the structure
  2026-03-23 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE105d [PATCH v2 3/7] of: reserved_mem: switch to ops based OF_DECLARE()
  2026-03-23 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE105d [PATCH v2 2/7] of: reserved_mem: use -ENODEV instead of -ENOENT
  2026-03-23 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE100d [PATCH v2 8/9] memblock, treewide: make memblock_free() handle late freeing
  2026-03-23 · Mike Rapoport <rppt@kernel.org>
• STALE112d [PATCH 7/8] memblock, treewide: make memblock_free() handle late freeing
  2026-03-18 · Mike Rapoport <rppt@kernel.org>
• STALE107d Re: [PATCH 3/7] of: reserved_mem: switch to ops based OF_DECLARE()
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d [PATCH 4/7] of: reserved_mem: replace CMA quirks by generic methods
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d [PATCH 3/7] of: reserved_mem: switch to ops based OF_DECLARE()
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d [PATCH 2/7] of: reserved_mem: use -ENODEV instead of -ENOENT
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d [PATCH 1/7] of: reserved_mem: remove fdt node from the structure
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE97d [PATCH v3 4/6] dma: coherent: store reserved memory coherent regions
  2026-03-06 · Albert Esteve <hidden>
• STALE125d [PATCH v2 5/6] dma: coherent: register to coherent heap
  2026-03-03 · Albert Esteve <hidden>
• STALE125d [PATCH v2 4/6] dma-buf: heaps: Add Coherent heap to dmabuf heaps
  2026-03-03 · Albert Esteve <hidden>
• STALE203d LANDED [PATCH] of: reserved_mem: Allow reserved_mem framework detect "cma=" kernel param
  2025-12-10 · Oreoluwa Babatunde <hidden>
• STALE210d LANDED: 2 (2M) [PATCH v4] of: reserved_mem: Restructure call site for dma_contiguous_early_fixup()
  2025-08-06 · Oreoluwa Babatunde <hidden>
• STALE338d REVIEWED: 2 (2M) [PATCH v3] of: reserved_mem: Restructure call site for dma_contiguous_early_fixup()
  2025-07-30 · Oreoluwa Babatunde <hidden>
• STALE300d [PATCH v7 4/5] dma: contiguous: Reserve default CMA heap
  2025-07-21 · Maxime Ripard <mripard@kernel.org>
• STALE300d [PATCH v7 3/5] dma: contiguous: Register reusable CMA regions at boot
  2025-07-21 · Maxime Ripard <mripard@kernel.org>
• STALE345d [PATCH v2] of: reserved_mem: Restructure call site for dma_contiguous_early_fixup()
  2025-07-18 · Oreoluwa Babatunde <hidden>
• STALE362d [PATCH v6 1/2] dma/contiguous: Add helper to test reserved memory type
  2025-07-09 · Maxime Ripard <mripard@kernel.org>
• STALE364d [PATCH] of: reserved_mem: Restructure call site for dma_contiguous_early_fixup()
  2025-07-08 · Oreoluwa Babatunde <hidden>

Quiet for 30+ days

Patches with no review trailers and no replies. Either the author is heads-down elsewhere or these slipped through. Oldest first.

• STALE125d [PATCH v2 5/6] dma: coherent: register to coherent heap
  2026-03-03 · Albert Esteve <hidden>
• STALE97d [PATCH v3 4/6] dma: coherent: store reserved memory coherent regions
  2026-03-06 · Albert Esteve <hidden>
• STALE107d [PATCH 2/7] of: reserved_mem: use -ENODEV instead of -ENOENT
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d [PATCH 1/7] of: reserved_mem: remove fdt node from the structure
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d [PATCH 4/7] of: reserved_mem: replace CMA quirks by generic methods
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE107d Re: [PATCH 3/7] of: reserved_mem: switch to ops based OF_DECLARE()
  2026-03-13 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE112d [PATCH 7/8] memblock, treewide: make memblock_free() handle late freeing
  2026-03-18 · Mike Rapoport <rppt@kernel.org>
• STALE100d [PATCH v2 8/9] memblock, treewide: make memblock_free() handle late freeing
  2026-03-23 · Mike Rapoport <rppt@kernel.org>
• STALE105d [PATCH v2 2/7] of: reserved_mem: use -ENODEV instead of -ENOENT
  2026-03-23 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE105d [PATCH v2 3/7] of: reserved_mem: switch to ops based OF_DECLARE()
  2026-03-23 · Marek Szyprowski <m.szyprowski@samsung.com>