[RFC PATCH v2 03/10] dma: contiguous: Add API to check if an allocation is from CMA

[Leon Romanovsky]

On Wed, Jul 08, 2026 at 11:48:47PM +0000, Samiullah Khawaja wrote:
> Add an API that uses cma_for_each() to check whether a DMA allocation is
> from a CMA region.
> 
> Signed-off-by: Samiullah Khawaja <skhawaja at google.com>
> ---
>  include/linux/dma-map-ops.h |  6 ++++++
>  kernel/dma/contiguous.c     | 24 ++++++++++++++++++++++++
>  2 files changed, 30 insertions(+)

<...>

>  #ifdef CONFIG_DMA_DECLARE_COHERENT
> diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
> index 03f52bd17120..0b1702bf39ca 100644
> --- a/kernel/dma/contiguous.c
> +++ b/kernel/dma/contiguous.c
> @@ -130,6 +130,30 @@ struct cma *dev_get_cma_area(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(dev_get_cma_area);
>  
> +struct dma_cma_check_data {
> +	phys_addr_t start;
> +	phys_addr_t end;
> +};

If this series is retried, use "struct phys_vec" here instead of
declaring a new structure:
https://elixir.bootlin.com/linux/v7.1.3/source/include/linux/types.h#L173

Thanks.