This patchset consists of two parts, the first is from John and TJ. It adds some heap interfaces, then our kernel users could allocate buffer from special heap. The second part is adding MTK secure heap for SVP (Secure Video Path). A total of two heaps are added, one is mtk_svp and the other is mtk_svp_cma. The mtk_svp buffer is reserved for the secure world after bootup and it is used for ES/working buffer, while the mtk_svp_cma buffer is dynamically reserved for the secure world and will be get ready when we start playing secure videos, this heap is used for the frame buffer. Once the security video playing is complete, the CMA will be released.
For easier viewing, I've split the new heap file into several patches.
The consumers of new heap and new interfaces are our codec and drm which will send upstream soon, probably this week.
Base on v6.6-rc1.
John Stultz (2): dma-heap: Add proper kref handling on dma-buf heaps dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps
T.J. Mercier (1): dma-buf: heaps: Deduplicate docs and adopt common format
Yong Wu (6): dma-buf: heaps: Initialise MediaTek secure heap dma-buf: heaps: mtk_sec_heap: Initialise tee session dma-buf: heaps: mtk_sec_heap: Add tee service call for buffer allocating/freeing dma-buf: heaps: mtk_sec_heap: Add dma_ops dt-bindings: reserved-memory: MediaTek: Add reserved memory for SVP dma_buf: heaps: mtk_sec_heap: Add a new CMA heap
.../mediatek,secure_cma_chunkmem.yaml | 42 ++ drivers/dma-buf/dma-heap.c | 127 +++-- drivers/dma-buf/heaps/Kconfig | 8 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/mtk_secure_heap.c | 458 ++++++++++++++++++ include/linux/dma-heap.h | 42 +- 6 files changed, 630 insertions(+), 48 deletions(-) create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml create mode 100644 drivers/dma-buf/heaps/mtk_secure_heap.c