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 [PATCH v7 00/19] PCI/P2PDMA: Route peer-to-peer DMA by TLP class
  2026-09-20 11:42 · 1 reply in 7d · Leon Romanovsky <leon@kernel.org>

Active reviewers (last 30 days)

• Tushar Dave <hidden>
  1 attestation (1 Tested-by) · last on 2026-09-20

Recent patches

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

• COOLING4d REVIEWED: 1 (0M) [PATCH v7 16/19] dma-buf: Let importers ask how peer-to-peer traffic is routed
  2026-09-20 · Leon Romanovsky <leon@kernel.org>
• COOLING5d [PATCH v6 17/18] dma-buf: Let importers ask how peer-to-peer traffic is routed
  2026-09-14 · Leon Romanovsky <leon@kernel.org>
• COLD15d [PATCH v5 17/18] dma-buf: Let importers ask how peer-to-peer traffic is routed
  2026-09-10 · Leon Romanovsky <leon@kernel.org>
• DORMANTno replies [PATCH v2] dma-buf: Document how exporters and importers agree on mapping lifetime
  2026-09-06 · Leon Romanovsky <leon@kernel.org>
• COLD22d [PATCH 2/2] dma-buf: Document how exporters and importers agree on mapping lifetime
  2026-08-25 · Leon Romanovsky <leon@kernel.org>
• COLD26d [PATCH v19 28/40] dept: assign unique dept_key to each distinct dma fence caller
  2026-07-06 · Byungchul Park <byungchul@sk.com>
• COLD26d [PATCH v19 20/40] dept: apply timeout consideration to dma fence wait
  2026-07-06 · Byungchul Park <byungchul@sk.com>
• COLD26d [PATCH v19 14/40] dept: apply sdt_might_sleep_{start,end}() to dma fence
  2026-07-06 · Byungchul Park <byungchul@sk.com>
• STALE130d [PATCH RFC 3/5] security: dma-heap: Add dma_heap_alloc LSM hook
  2026-05-12 · Albert Esteve <hidden>
• STALE130d [PATCH RFC 2/5] dma-heap: charge dma-buf memory via explicit memcg
  2026-05-12 · Albert Esteve <hidden>
• STALE130d [PATCH RFC 1/5] memcg: Track exported dma-buffers
  2026-05-12 · Albert Esteve <hidden>
• STALE130d [PATCH 2/8] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps
  2026-05-05 · Ketil Johnsen <hidden>
• STALE130d [PATCH 1/8] dma-heap: Add proper kref handling on dma-buf heaps
  2026-05-05 · Ketil Johnsen <hidden>
• STALE248d [PATCH] dma-buf: Remove DMA-BUF sysfs stats
  2026-01-16 · "T.J. Mercier" <tjmercier@google.com>
• STALE82d [PATCH v18 28/42] dept: assign unique dept_key to each distinct dma fence caller
  2025-12-05 · Byungchul Park <byungchul@sk.com>
• STALE82d [PATCH v18 20/42] dept: apply timeout consideration to dma fence wait
  2025-12-05 · Byungchul Park <byungchul@sk.com>
• STALE82d [PATCH v18 14/42] dept: apply sdt_might_sleep_{start,end}() to dma fence
  2025-12-05 · Byungchul Park <byungchul@sk.com>
• STALE266d LANDED: 11 (8M) [PATCH v9 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine
  2025-11-20 · Leon Romanovsky <leon@kernel.org>
• STALE310d Re: [Linaro-mm-sig] [PATCH v8 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine
  2025-11-20 · Leon Romanovsky <leon@kernel.org>
• STALE311d REVIEWED: 9 (9M) [PATCH v3 04/21] dma-buf: Switch to use %ptSp
  2025-11-13 · Andy Shevchenko <andriy.shevchenko@linux.intel.com>
• STALE317d REVIEWED: 3 (3M) [PATCH v2 04/21] dma-buf: Switch to use %ptSp
  2025-11-11 · Andy Shevchenko <andriy.shevchenko@linux.intel.com>
• STALE310d REVIEWED: 2 (0M) [PATCH v8 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine
  2025-11-11 · Leon Romanovsky <leon@kernel.org>
• STALE319d [PATCH v1 05/23] dma-buf: Switch to use %ptSp
  2025-11-10 · Andy Shevchenko <andriy.shevchenko@linux.intel.com>
• STALE312d REVIEWED: 2 (0M) [PATCH v7 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine
  2025-11-06 · Leon Romanovsky <leon@kernel.org>
• STALE282d [PATCH v6 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine
  2025-11-02 · Leon Romanovsky <leon@kernel.org>
• STALE343d LANDED: 1 (1M) [PATCH v8 5/5] dma-buf: heaps: cma: Create CMA heap for each CMA reserved region
  2025-10-13 · Maxime Ripard <mripard@kernel.org>
• STALE343d LANDED: 1 (1M) [PATCH v8 2/5] dma-buf: heaps: cma: Register list of CMA regions at boot
  2025-10-13 · Maxime Ripard <mripard@kernel.org>
• STALE299d [PATCH v17 32/47] dept: assign unique dept_key to each distinct dma fence caller
  2025-10-02 · Byungchul Park <byungchul@sk.com>
• STALE299d [PATCH v17 23/47] dept: apply timeout consideration to dma fence wait
  2025-10-02 · Byungchul Park <byungchul@sk.com>
• STALE299d [PATCH v17 17/47] dept: apply sdt_might_sleep_{start,end}() to dma fence
  2025-10-02 · Byungchul Park <byungchul@sk.com>

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.

• STALE130d [PATCH RFC 1/5] memcg: Track exported dma-buffers
  2026-05-12 · Albert Esteve <hidden>
• STALE130d [PATCH RFC 3/5] security: dma-heap: Add dma_heap_alloc LSM hook
  2026-05-12 · Albert Esteve <hidden>
• COLD26d [PATCH v19 14/40] dept: apply sdt_might_sleep_{start,end}() to dma fence
  2026-07-06 · Byungchul Park <byungchul@sk.com>
• COLD26d [PATCH v19 20/40] dept: apply timeout consideration to dma fence wait
  2026-07-06 · Byungchul Park <byungchul@sk.com>