This series adds support for the video protection region (VPR) used on Tegra SoC devices. It's a special region of memory that is protected from accesses by the CPU and used to store DRM protected content (both decrypted stream data as well as decoded video frames).
Patches 1 through 3 add DT binding documentation for the VPR and add the VPR to the list of memory-region items for display, host1x and NVDEC. Patch 4 adds bitmap_allocate(), which is like bitmap_allocate_region() but works on sizes that are not a power of two. Patch 5 introduces new APIs needed by the Tegra VPR implementation that allow memory to be allocated at a fixed offset within a CMA area. Tegra VPR needs this in order to implement its own allocator on top of CMA to meet the strict hardware requirements. This replaces the dynamic CMA area creation patch from earlier versions. Patch 6 adds some infrastructure for DMA heap implementations to provide information through debugfs. The Tegra VPR implementation is added in patch 7. See its commit message for more details about the specifics of this implementation. Finally, patches 8-10 add the VPR placeholder node on Tegra234 and Tegra264 and hook it up to the host1x node so that it can make use of this region. Changes in v5: - use a single CMA area in combination with the new cma_alloc_at() API - drop dynamic CMA area allocation patch - various cleanups - Link to v4: https://patch.msgid.link/[email protected] Changes in v4: - Link to v3: https://patch.msgid.link/[email protected] - fully remove from linear map while chunks are active - address checkpatch.pl and Sashiko comments - improve error handling - remove freezer support Changes in v3: - Link to v2: https://patch.msgid.link/[email protected] - introduce set_memory_device() and set_memory_normal() - rename VPR nodes to "protected" - add Tegra264 placeholder nodes Changes in v2: - Link to v1: https://patch.msgid.link/[email protected] - Tegra VPR implementation is now more optimized to reduce the number of (very slow) resize operations, and allows cross-chunk allocations - dynamic CMA areas are now trackd separately from static ones, but the global number of CMA pages accounts for all areas Thierry Signed-off-by: Thierry Reding <[email protected]> --- Thierry Reding (10): dt-bindings: reserved-memory: Document Tegra VPR dt-bindings: display: tegra: Document memory regions dt-bindings: gpu: host1x: Document memory-regions for NVDEC bitmap: Add bitmap_allocate() function mm/cma: Introduce cma_alloc_at() API dma-buf: heaps: Add debugfs support dma-buf: heaps: Add support for Tegra VPR arm64: tegra: Add VPR placeholder node on Tegra234 arm64: tegra: Hook up VPR to host1x arm64: tegra: Add VPR placeholder node on Tegra264 .../display/tegra/nvidia,tegra124-vic.yaml | 8 + .../bindings/display/tegra/nvidia,tegra186-dc.yaml | 10 + .../bindings/display/tegra/nvidia,tegra20-dc.yaml | 10 +- .../display/tegra/nvidia,tegra20-host1x.yaml | 7 + .../bindings/gpu/host1x/nvidia,tegra234-nvdec.yaml | 8 + .../nvidia,tegra-video-protection-region.yaml | 75 ++ arch/arm64/boot/dts/nvidia/tegra234.dtsi | 45 + arch/arm64/boot/dts/nvidia/tegra264.dtsi | 33 + drivers/dma-buf/dma-heap.c | 52 + drivers/dma-buf/heaps/Kconfig | 12 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/tegra-vpr.c | 1410 ++++++++++++++++++++ include/linux/bitmap.h | 25 +- include/linux/cma.h | 4 + include/linux/dma-heap.h | 2 + include/trace/events/cma.h | 63 + include/trace/events/tegra_vpr.h | 57 + mm/cma.c | 148 ++ 18 files changed, 1964 insertions(+), 6 deletions(-) --- base-commit: 48ae42ae65bf76d723943c717044a09ba6666e56 change-id: 20260507-tegra-vpr-cd4bc2509c4c Best regards, -- Thierry Reding <[email protected]>
