[Tee-dev] allocating memory for DMA

I am doing some experiments with a crypto device in the OP-TEE kernel. What is the recommended way to allocate physically contiguous memory for DMA?  Will using malloc() in the kernel give me physically contiguous memory?  ...based on what I see in documentation/optee_design.md it says that the heap is unpaged, which leads me to think that malloc gives contiguous memory, but wanted to confirm.

Thanks, Stuart