[PATCH v5 0/4] dma-buf: heaps: Turn heaps into modules

[Maxime Ripard]

Hi,

The recent introduction of heaps in the optee driver [1] made possible
the creation of heaps as modules.

It's generally a good idea if possible, including for the already
existing system and CMA heaps.

The system one is pretty trivial, the CMA is now easy too with the
reworks we got in 7.1-r1.

Let me know what you think,
Maxime

1: https://lore.kernel.org/dri-devel/20250911135007.1275833-4-jens.wiklander@xxxxxxxxxx/

Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx>
---
Changes in v5:
- Rebase on 7.1-rc1
- Add a patch to enable the heaps in arm64 defconfig
- Link to v4: https://lore.kernel.org/r/20260331-dma-buf-heaps-as-modules-v4-0-e18fda504419@xxxxxxxxxx

Changes in v4:
- Fix compilation failure
- Rework to take into account OF_RESERVED_MEM
- Fix regression making the default CMA area disappear if not created
  through the DT
- Added some documentation and comments
- Link to v3: https://lore.kernel.org/r/20260303-dma-buf-heaps-as-modules-v3-0-24344812c707@xxxxxxxxxx

Changes in v3:
- Squashed cma_get_name and cma_alloc/release patches
- Fixed typo in Export dev_get_cma_area commit title
- Fixed compilation failure with DMA_CMA but not OF_RESERVED_MEM
- Link to v2: https://lore.kernel.org/r/20260227-dma-buf-heaps-as-modules-v2-0-454aee7e06cc@xxxxxxxxxx

Changes in v2:
- Collect tags
- Don't export dma_contiguous_default_area anymore, but export
  dev_get_cma_area instead
- Mentioned that heap modules can't be removed
- Link to v1: https://lore.kernel.org/r/20260225-dma-buf-heaps-as-modules-v1-0-2109225a090d@xxxxxxxxxx

---
Maxime Ripard (4):
      dma-buf: heaps: Export mem_accounting parameter
      dma-buf: heaps: cma: Turn the heap into a module
      dma-buf: heaps: system: Turn the heap into a module
      arm64: defconfig: Enable dma-buf heaps

 arch/arm64/configs/defconfig        | 3 +++
 drivers/dma-buf/dma-heap.c          | 1 +
 drivers/dma-buf/heaps/Kconfig       | 4 ++--
 drivers/dma-buf/heaps/cma_heap.c    | 3 +++
 drivers/dma-buf/heaps/system_heap.c | 5 +++++
 5 files changed, 14 insertions(+), 2 deletions(-)
---
base-commit: 5e9b7d093f3f77cb0af4409559e3d139babfb443
change-id: 20260225-dma-buf-heaps-as-modules-1034b3ec9f2a

Best regards,
-- 
Maxime Ripard <mripard@xxxxxxxxxx>