On 13.10.2025 10:35, Maxime Ripard wrote:
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 tjmercier@google.com Signed-off-by: Maxime Ripard mripard@kernel.org
Acked-by: Marek Szyprowski m.szyprowski@samsung.com
kernel/dma/contiguous.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index d9b9dcba6ff7cf5904ac93b72c061fd59072c41b..d67e95094749d45f43c1809c175e491a3f55b2e1 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -40,10 +40,11 @@ #include <asm/page.h> #include <linux/memblock.h> #include <linux/err.h> #include <linux/sizes.h> +#include <linux/dma-buf/heaps/cma.h> #include <linux/dma-map-ops.h> #include <linux/cma.h> #include <linux/nospec.h> #ifdef CONFIG_CMA_SIZE_MBYTES @@ -491,9 +492,13 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem) rmem->priv = cma; 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); #endif
Best regards