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.
New set_memory_device() and set_memory_normal() helpers are defined in patch 4 and will subsequently be used to set the memory type of the VPR to make sure it won't be accessed by the CPU once it's made part of the protected region.
Patch 5 adds bitmap_allocate(), which is like bitmap_allocate_region() but works on sizes that are not a power of two.
Patch 6 introduces new APIs needed by the Tegra VPR implementation that allow CMA areas to be dynamically created at runtime rather than using the fixed, system-wide list. This is used in this driver specifically because it can use an arbitrary number of these areas (though they are currently limited to 4).
Patch 7 adds some infrastructure for DMA heap implementations to provide information through debugfs.
The Tegra VPR implementation is added in patch 8. See its commit message for more details about the specifics of this implementation.
Finally, patches 9-11 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 v3: - Link to v2: https://patch.msgid.link/20260122161009.3865888-1-thierry.reding@kernel.org - 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/20250902154630.4032984-1-thierry.reding@gmail.com - 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 treding@nvidia.com --- Chun Ng (1): arm64/mm: Add set_memory_device() and set_memory_normal()
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: Allow dynamically creating CMA areas 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 | 76 ++ arch/arm/mm/dma-mapping.c | 2 +- arch/arm64/boot/dts/nvidia/tegra234.dtsi | 45 + arch/arm64/boot/dts/nvidia/tegra264.dtsi | 33 + arch/arm64/include/asm/set_memory.h | 2 + arch/arm64/mm/pageattr.c | 16 + arch/s390/mm/init.c | 2 +- drivers/dma-buf/dma-heap.c | 56 + drivers/dma-buf/heaps/Kconfig | 7 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/tegra-vpr.c | 1242 ++++++++++++++++++++ include/linux/bitmap.h | 25 +- include/linux/cma.h | 8 +- include/linux/dma-heap.h | 2 + include/linux/set_memory.h | 11 + include/trace/events/tegra_vpr.h | 57 + kernel/dma/contiguous.c | 2 +- mm/cma.c | 187 ++- mm/cma.h | 5 +- 24 files changed, 1775 insertions(+), 47 deletions(-) --- base-commit: 703daa6d046136affd69f2a2e08f36ac4a7d5b2c change-id: 20260507-tegra-vpr-cd4bc2509c4c
Best regards, -- Thierry Reding treding@nvidia.com