On 4/27/26 5:04 AM, Maxime Ripard wrote:
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@li...
Signed-off-by: Maxime Ripard mripard@kernel.org
Changes in v5:
- Rebase on 7.1-rc1
- Add a patch to enable the heaps in arm64 defconfig
Could you do this for ARM (multi_v7_defconfig) also? Actually seems loongarch has Heaps enabled by default and I've seen it default enabled on some x86 distros too. Maybe someday having the base Heaps + System Heap set to "default y/m" as they should always exist for any arch would be an idea. Anyway for this series all LGTM,
Acked-by: Andrew Davis afd@ti.com
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-v3-0-24344812c70...
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-v2-0-454aee7e06c...
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-v1-0-2109225a090...
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,