Re: [PATCH 5/5] media: verisilicon: Flush IOMMU before decoding a frame

[Jason Gunthorpe]

On Mon, Jun 16, 2025 at 04:55:53PM +0200, Benjamin Gaignard wrote:
> Flush the IOMMU mapping before decoding a frame to ensure that all memory
> translations are properly applied.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>
> ---
>  drivers/media/platform/verisilicon/hantro_drv.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)

This is a really big red flag.

iommu translations are supposed to be controlled by the iommu driver
and should be flushed as part of the iommu map/unmap flows. It should
never be necessary to do something like this.

Jason