Re: [PATCH v2 7/8] docs: dma-api: update streaming DMA physical address constraints

[Randy Dunlap]

On 6/27/25 3:10 AM, Petr Tesarik wrote:
> Add an introductory paragraph to Part Id - Streaming DMA mappings and move
> the explanation of address constraints there, because it applies to all map
> functions.
> 
> Clarify that streaming DMA can be used with memory which does not meet the
> addressing constraints of a device, but it may fail in that case.
> 
> Make a note about SWIOTLB and link to the detailed description of it.
> 
> Do not mention platform-dependent allocation flags. The note may mislead
> device driver authors into thinking that they should poke into and try to
> second-guess the DMA API implementation. They definitely shouldn't.
> 
> Remove the claim that platforms with an IOMMU may not require physically
> contiguous buffers. The current implementation explicitly rejects vmalloc
> addresses, regardless of IOMMU.
> 
> Signed-off-by: Petr Tesarik <ptesarik@xxxxxxxx>

Tested-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Thanks.

> ---
>  Documentation/core-api/dma-api.rst | 36 +++++++++++++++++-------------
>  1 file changed, 21 insertions(+), 15 deletions(-)

-- 
~Randy