dma buffer sharing framework · Maintained

Maintainers

• M Sumit Semwal <sumit.semwal@linaro.org>
• M Christian König <christian.koenig@amd.com>

Paths

• F Documentation/driver-api/dma-buf.rst
• F Documentation/userspace-api/dma-buf-alloc-exchange.rst
• F drivers/dma-buf/
• F include/linux/*fence.h
• F include/linux/dma-buf.h
• F include/linux/dma-buf/
• F include/linux/dma-resv.h
• F rust/helpers/dma-resv.c

Last 30 days

Most active threads (last 7 days)

• COOLING4d [RFC PATCH v7 00/13] coco: guest: Add a shared-granule allocator for host-shared memory
  2026-09-21 14:50 · 2 replies in 7d · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>

Recent patches

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

• COOLING4d [RFC PATCH v7 12/13] dma-buf: system_heap: Allocate shared buffers using CoCo shared memory allocator
  2026-09-21 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COOLING4d [RFC PATCH v7 11/13] dma-buf: system_heap: Limit scatterlist entries to the buffer size
  2026-09-21 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COOLING11d [PATCH RFC POC 26/50] dma-buf: stop unwinding sync file descriptors by hand
  2026-09-15 · Christian Brauner <brauner@kernel.org>
• COOLING4d [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers
  2026-09-04 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COLD38d [PATCH v2 4/4] dma-buf: heaps: Fix shared system heap allocation rollback
  2026-08-20 · Steven Price <steven.price@arm.com>
• COLD38d REVIEWED: 6 (6M) [PATCH v2 3/4] dma-buf: heaps: Zero system shared heap pages after conversion
  2026-08-20 · Steven Price <steven.price@arm.com>
• COLD33d [PATCH 2/2] dma-buf: heaps: Zero system shared heap pages after conversion
  2026-08-20 · Steven Price <steven.price@arm.com>
• STALE73d Re: [PATCH v7 16/22] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
  2026-07-08 · Aneesh Kumar K.V <aneesh.kumar@kernel.org>
• STALE67d [PATCH v5 07/10] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers
  2026-07-06 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• STALE131d [PATCH 2/8] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps
  2026-05-05 · Ketil Johnsen <hidden>
• STALE131d [PATCH 1/8] dma-heap: Add proper kref handling on dma-buf heaps
  2026-05-05 · Ketil Johnsen <hidden>
• STALE359d REVIEWED: 8 (8M) [PATCH v12 2/9] dma-buf: dma-heap: export declared functions
  2025-09-11 · Jens Wiklander <hidden>
• STALE402d Re: [PATCH] arm64/dma-mapping: Fix arch_sync_dma_for_device to respect dir parameter
  2025-08-20 · Catalin Marinas <catalin.marinas@arm.com>
• STALE381d REVIEWED: 1 (1M) [PATCH v11 2/9] dma-buf: dma-heap: export declared functions
  2025-08-13 · Jens Wiklander <hidden>
• STALE445d [PATCH v10 2/9] dma-buf: dma-heap: export declared functions
  2025-06-10 · Jens Wiklander <hidden>
• STALE482d [PATCH v9 2/9] dma-buf: dma-heap: export declared functions
  2025-05-20 · Jens Wiklander <hidden>
• STALE508d [PATCH v8 05/14] dma-buf: dma-heap: export declared functions
  2025-05-02 · Jens Wiklander <hidden>
• STALE563d [RFC PATCH 2/5] cma-heap: Allow registration of custom cma heaps
  2025-01-30 · Florent Tomasin <hidden>
• STALE727d [RFC PATCH 4/4] dma-buf: heaps: add Linaro restricted dmabuf heap support
  2024-08-30 · Jens Wiklander <hidden>
• STALE727d [RFC PATCH 1/4] dma-buf: heaps: restricted_heap: add no_map attribute
  2024-08-30 · Jens Wiklander <hidden>
• STALE683d [PATCH v7 04/28] dma-buf: heaps: Deduplicate docs and adopt common format
  2024-07-20 · Yunfei Dong <yunfei.dong@mediatek.com>
• STALE683d [PATCH v7 06/28] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps
  2024-07-20 · Yunfei Dong <yunfei.dong@mediatek.com>
• STALE683d [PATCH v7 05/28] dma-heap: Add proper kref handling on dma-buf heaps
  2024-07-20 · Yunfei Dong <yunfei.dong@mediatek.com>
• STALE831d [PATCH v6,05/24] dma-buf: heaps: Deduplicate docs and adopt common format
  2024-05-16 · Yunfei Dong <yunfei.dong@mediatek.com>
• STALE831d [PATCH v6,07/24] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps
  2024-05-16 · Yunfei Dong <yunfei.dong@mediatek.com>
• STALE831d [PATCH v6,06/24] dma-heap: Add proper kref handling on dma-buf heaps
  2024-05-16 · Yunfei Dong <yunfei.dong@mediatek.com>
• STALE766d [PATCH v5 9/9] dma_buf: heaps: restricted_heap_mtk: Add a new CMA heap
  2024-05-15 · Yong Wu <yong.wu@mediatek.com>
• STALE766d [PATCH v5 8/9] dma-buf: heaps: restricted_heap_mtk: Add TEE memory service call
  2024-05-15 · Yong Wu <yong.wu@mediatek.com>
• STALE766d [PATCH v5 7/9] dma-buf: heaps: restricted_heap: Add MediaTek restricted heap and heap_init
  2024-05-15 · Yong Wu <yong.wu@mediatek.com>
• STALE766d [PATCH v5 6/9] dma-buf: heaps: restricted_heap: Add dma_ops
  2024-05-15 · Yong Wu <yong.wu@mediatek.com>

Needs attention (review trailers in, no pickup)

Patches with review trailers that haven't landed in mainline and haven't been Acked by a maintainer. Oldest first.

• COLD38d REVIEWED: 6 (6M) [PATCH v2 3/4] dma-buf: heaps: Zero system shared heap pages after conversion
  2026-08-20 · Steven Price <steven.price@arm.com> · 1 Reviewed-by

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.

• STALE67d [PATCH v5 07/10] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers
  2026-07-06 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• STALE73d Re: [PATCH v7 16/22] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
  2026-07-08 · Aneesh Kumar K.V <aneesh.kumar@kernel.org>