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From: Benjamin Gaignard <benjamin.gaignard@collabora.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com,
	robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org,
	heiko@sntech.de, nicolas.dufresne@collabora.com,
	p.zabel@pengutronix.de, mchehab@kernel.org,
	iommu@lists.linux.dev, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-media@vger.kernel.org,
	kernel@collabora.com
Subject: Re: [PATCH 5/5] media: verisilicon: Flush IOMMU before decoding a frame
Date: Tue, 17 Jun 2025 18:01:31 +0200	[thread overview]
Message-ID: <30a48107-8e98-42dd-a5a7-9c87c9eb538d@collabora.com> (raw)
In-Reply-To: <20250617155822.GE1376515@ziepe.ca>


Le 17/06/2025 à 17:58, Jason Gunthorpe a écrit :
> 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@collabora.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.

I have redone tests without this patch and the decode is perform correctly.
I will drop it in the next version.
I think I have fix the reference frame management in the driver so it becomes
useless.

Benjamin

>
> Jason

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  reply	other threads:[~2025-06-17 17:12 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-06-16 14:55 [PATCH 0/5] Add support for Verisilicon IOMMU used by media codec blocks Benjamin Gaignard
2025-06-16 14:55 ` [PATCH 1/5] dt-bindings: vendor-prefixes: Add Verisilicon Benjamin Gaignard
2025-06-16 15:15   ` Conor Dooley
2025-06-16 14:55 ` [PATCH 2/5] dt-bindings: iommu: verisilicon: Add binding for VSI IOMMU Benjamin Gaignard
2025-06-16 15:14   ` Conor Dooley
2025-06-16 15:30     ` Benjamin Gaignard
2025-06-16 15:42       ` Conor Dooley
2025-06-16 15:50         ` Benjamin Gaignard
2025-06-16 15:58           ` Conor Dooley
2025-06-16 16:06             ` Benjamin Gaignard
2025-06-16 21:19     ` Nicolas Dufresne
2025-06-16 14:55 ` [PATCH 3/5] iommu: Add verisilicon IOMMU driver Benjamin Gaignard
2025-06-17 13:04   ` Diederik de Haas
2025-06-17 13:48     ` Benjamin Gaignard
2025-06-17 16:32   ` Jason Gunthorpe
2025-06-18 12:04     ` Benjamin Gaignard
2025-06-18 13:27       ` Jason Gunthorpe
2025-06-18  4:53   ` kernel test robot
2025-06-16 14:55 ` [PATCH 4/5] arm64: dts: rockchip: Add verisilicon IOMMU node on RK3588 Benjamin Gaignard
2025-06-16 14:55 ` [PATCH 5/5] media: verisilicon: Flush IOMMU before decoding a frame Benjamin Gaignard
2025-06-17 15:58   ` Jason Gunthorpe
2025-06-17 16:01     ` Benjamin Gaignard [this message]
2025-06-17 16:04       ` Robin Murphy

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