Commit 84a59306 authored by Maxime Ripard's avatar Maxime Ripard Committed by Sumit Semwal
Browse files

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: default avatarT.J. Mercier <tjmercier@google.com>
Signed-off-by: default avatarMaxime Ripard <mripard@kernel.org>
Acked-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Link: https://lore.kernel.org/r/20251013-dma-buf-ecc-heap-v8-3-04ce150ea3d9@kernel.org
parent 8b5690d5

kernel/dma/contiguous.c

+5 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#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>
@@ -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);