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

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Message-ID: <20250617155822.GE1376515@ziepe.ca>
Date: Tue, 17 Jun 2025 12:58:22 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc: joro@...tes.org, will@...nel.org, robin.murphy@....com, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, heiko@...ech.de,
	nicolas.dufresne@...labora.com, p.zabel@...gutronix.de,
	mchehab@...nel.org, iommu@...ts.linux.dev,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-media@...r.kernel.org,
	kernel@...labora.com
Subject: Re: [PATCH 5/5] media: verisilicon: Flush IOMMU before decoding a
 frame

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@...labora.com>
> ---
>  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