linux-kernel - Re: [PATCH] iommu/arm-smmu-qcom: Only enable stall on smmu-v2

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Message-ID: <20241219113019.GA23640@willie-the-truck>
Date: Thu, 19 Dec 2024 11:30:20 +0000
From: Will Deacon <will@...nel.org>
To: Rob Clark <robdclark@...il.com>
Cc: iommu@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
	freedreno@...ts.freedesktop.org,
	Akhil P Oommen <quic_akhilpo@...cinc.com>,
	Rob Clark <robdclark@...omium.org>,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	"moderated list:ARM SMMU DRIVERS" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iommu/arm-smmu-qcom: Only enable stall on smmu-v2

On Mon, Dec 16, 2024 at 09:10:17AM -0800, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> On mmu-500, stall-on-fault seems to stall all context banks, causing the
> GMU to misbehave.  So limit this feature to smmu-v2 for now.

MMU-500 has public documentation so please can you dig up what the
actual behaviour is rather than guess?

> This fixes an issue with an older mesa bug taking outo the system
> because of GMU going off into the year.

Sorry, but I don't understand this sentence.

Will