userspace dma buffer driver · Maintained

Maintainers

• M Gerd Hoffmann <kraxel@redhat.com>
• M Vivek Kasireddy <vivek.kasireddy@intel.com>

Paths

• F drivers/dma-buf/udmabuf.c
• F include/uapi/linux/udmabuf.h

Last 30 days

Active reviewers (last 30 days)

• Christian König <christian.koenig@amd.com>
  1 attestation (1 Suggested-by) · last on 2026-06-24

Recent patches

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

• WARM3d [PATCH v1] udmabuf: Ensure to perform cache synchronisation in begin_cpu_udmabuf()
  2026-06-27 · Robert Mader <hidden>
• COOLING11d [PATCH v2] udmabuf: serialize the sg_table cache under the reservation lock
  2026-06-25 · Bryam Vargas via B4 Relay <devnull+hexlabsecurity.proton.me@kernel.org>
• COOLING11d [PATCH] dma-buf: udmabuf: make list limit unsigned
  2026-06-25 · Yousef Alhouseen <hidden>
• COOLING11d [PATCH] udmabuf: serialize the sg_table cache under the reservation lock
  2026-06-25 · Bryam Vargas <hidden>
• DORMANTno replies [PATCH v2] dma-buf: udmabuf: avoid list copy size overflow
  2026-06-24 · Yousef Alhouseen <hidden>
• COOLING10d [PATCH] dma-buf: udmabuf: avoid list copy size overflow
  2026-06-24 · Yousef Alhouseen <hidden>
• COLD20d [PATCH net-next v3 2/4] udmabuf: emit one sg entry per pinned folio
  2026-06-12 · Bobby Eshleman <hidden>
• COLD19d [PATCH net-next v2 2/4] udmabuf: emit one sg entry per pinned folio
  2026-06-11 · Bobby Eshleman <hidden>
• COLD30d [PATCH] dma-buf: udmabuf: validate create-list count before copying
  2026-06-05 · Samuel Moelius <hidden>
• COLD26d [PATCH net-next 2/4] udmabuf: emit one sg entry per pinned folio
  2026-06-04 · Bobby Eshleman <hidden>
• STALE67d [PATCH v2] dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning
  2026-03-31 · Mikhail Gavrilov <hidden>
• STALE97d [PATCH] dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning
  2026-03-17 · Mikhail Gavrilov <hidden>
• STALE96d [PATCH] udmabuf: fix DMA direction mismatch in release_udmabuf()
  2026-03-14 · Mikhail Gavrilov <hidden>
• STALE111d [PATCH] udmabuf: Do not create malformed scatterlists
  2026-03-13 · Jason Gunthorpe <jgg@nvidia.com>
• COLD55d [PATCH RFC 07/26] dma-buf: Convert all the simple exporters to use SGT mapping type
  2026-02-18 · Jason Gunthorpe <jgg@nvidia.com>
• STALE322d REVIEWED: 1 (1M) [PATCH v2 3/3] udmabuf: Use module_misc_device() to register this device
  2025-08-14 · Andrew Davis <hidden>
• STALE322d [PATCH v2 1/3] udmabuf: Keep track current device mappings
  2025-08-14 · Andrew Davis <hidden>
• STALE322d [PATCH v2 2/3] udmabuf: Sync buffer mappings for attached devices
  2025-08-14 · Andrew Davis <hidden>
• STALE385d [PATCH v4 3/4] udmabuf: Implement udmabuf direct I/O
  2025-06-03 · wangtao <hidden>
• STALE398d [PATCH v3 3/4] udmabuf: Implement udmabuf rw_file callback
  2025-05-30 · wangtao <hidden>
• STALE390d LANDED: 1 (1M) [PATCH v3 2/3] udmabuf: use sgtable-based scatterlist wrappers
  2025-05-07 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE424d REVIEWED: 1 (1M) [PATCH v2 2/3] udmabuf: use sgtable-based scatterlist wrappers
  2025-05-07 · Marek Szyprowski <m.szyprowski@samsung.com>
• STALE425d [PATCH 2/3] udmabuf: use sgtable-based scatterlist wrappers
  2025-05-06 · Marek Szyprowski <m.szyprowski@samsung.com>
• DORMANTno replies LANDED [PATCH v2 2/2] udmabuf: fix vmap missed offset page
  2025-04-28 · Huan Yang <hidden>
• STALE434d LANDED [PATCH v2 1/2] Revert "udmabuf: fix vmap_udmabuf error page set"
  2025-04-28 · Huan Yang <hidden>
• STALE434d REVIEWED: 1 (1M) Re: [PATCH 1/2] Revert "udmabuf: fix vmap_udmabuf error page set"
  2025-04-23 · Huan Yang <hidden>
• STALE434d [PATCH 2/2] udmabuf: fix vmap missed offset page
  2025-04-15 · Huan Yang <hidden>
• STALE434d [PATCH 1/2] Revert "udmabuf: fix vmap_udmabuf error page set"
  2025-04-15 · Huan Yang <hidden>
• STALE448d [PATCH AUTOSEL 5.4 2/5] udmabuf: fix a buf size overflow issue during udmabuf creation
  2025-04-14 · Sasha Levin <sashal@kernel.org>
• STALE448d [PATCH AUTOSEL 5.10 02/11] udmabuf: fix a buf size overflow issue during udmabuf creation
  2025-04-14 · Sasha Levin <sashal@kernel.org>

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.

• COLD55d [PATCH RFC 07/26] dma-buf: Convert all the simple exporters to use SGT mapping type
  2026-02-18 · Jason Gunthorpe <jgg@nvidia.com>