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.
Signed-off-by: Maxime Ripard mripard@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 8df0dfaaca18eeb0a20145512ba64425d2e7601e..e81982c0ee8f5c0654731adb611df4bcc4637c7c 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 @@ -490,9 +491,13 @@ 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