Linaro-mm-sig February 2026

linaro-mm-sig@lists.linaro.org

129 participants
1793 discussions

[PATCH 0/9] accel: New driver for NXP's Neutron NPU

by Ioana Ciocoi-Radulescu

Introduce a new accel driver for the Neutron Neural Processing Unit (NPU), along with associated dt-bindings and DTS node. The first patch extends the GEM DMA helper APIs to allow bidirectional mapping of non-coherent DMA buffers. While not part of the Neutron driver, it's a prerequisite allowing us to use the GEM DMA helper. Neutron is a Neural Processing Unit from NXP, providing machine learning (ML) acceleration for edge AI applications. Neutron is integrated on NXP SoCs such as the i.MX95. The NPU consists of the following: - RISC-V core running a proprietary firmware - One or more Neutron cores, representing the main computation engine performing ML operations - Dedicated fast memory (TCM) - DMA engine that handles data transfers between DDR and TCM The firmware is closed source and distributed as a binary here [1]. The Neutron software stack also contains a userspace library [1] and a LiteRT custom delegate [2] that allow integration with standard LiteRT tools. [1] https://github.com/nxp-upstream/neutron/tree/upstream [2] https://github.com/nxp-imx/tflite-neutron-delegate Signed-off-by: Ioana Ciocoi-Radulescu <ruxandra.radulescu(a)nxp.com> --- Ioana Ciocoi-Radulescu (9): drm/gem-dma: Add flag for bidirectional mapping of non-coherent GEM DMA buffers accel/neutron: Add documentation for NXP Neutron accelerator driver dt-bindings: npu: Add bindings for NXP Neutron accel/neutron: Add driver for NXP Neutron NPU accel/neutron: Add GEM buffer object support accel/neutron: Add mailbox support accel/neutron: Add job submission IOCTL accel/neutron: Add logging support arm64: dts: imx95: Add Neutron node Documentation/accel/index.rst | 1 + Documentation/accel/neutron/index.rst | 12 + Documentation/accel/neutron/neutron.rst | 131 ++++++++ .../devicetree/bindings/npu/nxp,imx95-neutron.yaml | 95 ++++++ MAINTAINERS | 10 + arch/arm64/boot/dts/freescale/imx95.dtsi | 28 ++ drivers/accel/Kconfig | 1 + drivers/accel/Makefile | 3 +- drivers/accel/neutron/Kconfig | 16 + drivers/accel/neutron/Makefile | 12 + drivers/accel/neutron/neutron_debugfs.c | 34 ++ drivers/accel/neutron/neutron_debugfs.h | 15 + drivers/accel/neutron/neutron_device.c | 239 ++++++++++++++ drivers/accel/neutron/neutron_device.h | 158 +++++++++ drivers/accel/neutron/neutron_driver.c | 262 +++++++++++++++ drivers/accel/neutron/neutron_driver.h | 16 + drivers/accel/neutron/neutron_gem.c | 115 +++++++ drivers/accel/neutron/neutron_gem.h | 14 + drivers/accel/neutron/neutron_job.c | 367 +++++++++++++++++++++ drivers/accel/neutron/neutron_job.h | 45 +++ drivers/accel/neutron/neutron_mailbox.c | 47 +++ drivers/accel/neutron/neutron_mailbox.h | 42 +++ drivers/gpu/drm/drm_gem_dma_helper.c | 6 +- include/drm/drm_gem_dma_helper.h | 3 + include/uapi/drm/neutron_accel.h | 130 ++++++++ 25 files changed, 1799 insertions(+), 3 deletions(-) --- base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f change-id: 20260226-neutron-c435e39d167f Best regards, -- Ioana Ciocoi-Radulescu <ruxandra.radulescu(a)nxp.com>

3 months, 3 weeks

[PATCH v2 0/9] dma-buf: heaps: Turn heaps into modules

by 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 one is a bit more involved, especially since we have a call from kernel/dma/contiguous.c to the CMA heap code. This was solved by turning the logic around and making the CMA heap call into the contiguous DMA code. Let me know what you think, Maxime 1: https://lore.kernel.org/dri-devel/20250911135007.1275833-4-jens.wiklander@l… Signed-off-by: Maxime Ripard <mripard(a)kernel.org> --- 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-v1-0-2109225a09… --- Maxime Ripard (9): dma: contiguous: Turn heap registration logic around dma: contiguous: Make dev_get_cma_area() a proper function dma: contiguous: Make dma_contiguous_default_area static mm: cma: Export dev_get_cma_area() mm: cma: Export cma_alloc and cma_release mm: cma: Export cma_get_name 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 drivers/dma-buf/dma-heap.c | 1 + drivers/dma-buf/heaps/Kconfig | 4 ++-- drivers/dma-buf/heaps/cma_heap.c | 21 +++++---------------- drivers/dma-buf/heaps/system_heap.c | 5 +++++ include/linux/dma-map-ops.h | 14 ++++++-------- kernel/dma/contiguous.c | 37 ++++++++++++++++++++++++++++++++++--- mm/cma.c | 3 +++ 7 files changed, 56 insertions(+), 29 deletions(-) --- base-commit: 499a718536dc0e1c1d1b6211847207d58acd9916 change-id: 20260225-dma-buf-heaps-as-modules-1034b3ec9f2a Best regards, -- Maxime Ripard <mripard(a)kernel.org>

3 months, 3 weeks

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3 months, 4 weeks