From 84a593066a85e6fdfb7b71f74400ed6bb5e0c3fa Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Mon, 13 Oct 2025 10:35:18 +0200 Subject: [PATCH] dma: contiguous: Register reusable CMA regions at boot In order to create a CMA dma-buf heap instance for each CMA heap region in the system, we need to collect all of them during boot. They are created from two main sources: the reserved-memory regions in the device tree, and the default CMA region created from the configuration or command line parameters, if no default region is provided in the device tree. Let's collect all the device-tree defined CMA regions flagged as reusable. Reviewed-by: T.J. Mercier Signed-off-by: Maxime Ripard Acked-by: Marek Szyprowski Signed-off-by: Sumit Semwal Link: https://lore.kernel.org/r/20251013-dma-buf-ecc-heap-v8-3-04ce150ea3d9@kernel.org --- kernel/dma/contiguous.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index d9b9dcba6ff7c..d67e95094749d 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include #include @@ -493,6 +494,10 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem) pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n", &rmem->base, (unsigned long)rmem->size / SZ_1M); + err = dma_heap_cma_register_heap(cma); + if (err) + pr_warn("Couldn't register CMA heap."); + return 0; } RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup); -- 2.47.3