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)

• COOLING5d [RFC PATCH v8 00/14] coco: guest: Add a shared-granule allocator for host-shared memory
  2026-09-24 10:08 · 2 replies in 7d · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>

Recent patches

Most-recent 17 patches in this subsystem on linux-coco, ordered by date desc.

• COOLING5d [RFC PATCH v8 11/14] dma-buf: system_heap: Allocate shared buffers using CoCo shared memory allocator
  2026-09-24 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COOLING5d [RFC PATCH v8 10/14] dma-buf: system_heap: Limit scatterlist entries to the buffer size
  2026-09-24 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COOLING7d [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>
• COOLING7d [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>
• COOLING7d [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>
• STALE76d 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>
• STALE70d [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 Re: [PATCH v5 1/2] dma-mapping: introduce DMA_ATTR_CC_SHARED for shared memory
  2026-05-21 · Jason Gunthorpe <jgg@ziepe.ca>
• STALE131d LANDED [PATCH v5 2/2] dma-buf: heaps: system: add system_cc_shared heap for explicitly shared memory
  2026-03-25 · Jiri Pirko <jiri@resnulli.us>
• STALE190d [PATCH v4 2/2] dma-buf: heaps: system: add system_cc_decrypted heap for explicitly decrypted memory
  2026-03-16 · Jiri Pirko <jiri@resnulli.us>
• STALE190d [PATCH net-next v3 2/2] dma-buf: heaps: system: add system_cc_decrypted heap for explicitly decrypted memory
  2026-03-05 · Jiri Pirko <jiri@resnulli.us>
• STALE218d [PATCH v2 2/2] dma-buf: heaps: system: add system_cc_decrypted heap for explicitly decrypted memory
  2026-02-23 · Jiri Pirko <jiri@resnulli.us>
• STALE219d [PATCH 5/5] dma-buf: heaps: system: add an option to allocate explicitly decrypted memory
  2026-02-09 · Jiri Pirko <jiri@resnulli.us>
• STALE219d [PATCH 4/5] dma-buf: heaps: allow heap to specify valid heap flags
  2026-02-09 · Jiri Pirko <jiri@resnulli.us>
• STALE219d [PATCH 3/5] dma-buf: heaps: use designated initializer for exp_info
  2026-02-09 · Jiri Pirko <jiri@resnulli.us>
• COLD56d [RFC PATCH 01/30] HACK: dma-buf: Introduce dma_buf_get_pfn_unlocked() kAPI
  2025-05-29 · Xu Yilun <hidden>
• STALE141d [RFC PATCH 01/12] dma-buf: Introduce dma_buf_get_pfn_unlocked() kAPI
  2025-01-08 · Xu Yilun <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.

• STALE70d [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>
• STALE76d 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>