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

[Samiullah Khawaja]

On Wed, Jul 15, 2026 at 09:21:16AM +0300, Leon Romanovsky wrote:
> 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@xxxxxxxxxx>
> > ---
> >  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

Sure this sounds great.
> Thanks.

Sami