From: Johan Hovold <johan@kernel.org>
To: Rob Clark <robdclark@gmail.com>
Cc: iommu@lists.linux-foundation.org,
freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
Robin Murphy <robin.murphy@arm.com>,
Rob Clark <robdclark@chromium.org>,
stable@vger.kernel.org, Will Deacon <will@kernel.org>,
Joerg Roedel <joro@8bytes.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Bjorn Andersson <quic_bjorande@quicinc.com>,
Manivannan Sadhasivam <mani@kernel.org>,
Danila Tikhonov <danila@jiaxyga.com>,
Elliot Berman <quic_eberman@quicinc.com>,
"moderated list:ARM SMMU DRIVERS"
<linux-arm-kernel@lists.infradead.org>,
"open list:IOMMU SUBSYSTEM" <iommu@lists.linux.dev>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] iommu/arm-smmu-qcom: Add missing GMU entry to match table
Date: Mon, 11 Dec 2023 11:11:29 +0100 [thread overview]
Message-ID: <ZXbgUeuf0-dYBOYV@hovoldconsulting.com> (raw)
In-Reply-To: <20231210180655.75542-1-robdclark@gmail.com>
On Sun, Dec 10, 2023 at 10:06:53AM -0800, Rob Clark wrote:
> From: Rob Clark <robdclark@chromium.org>
>
> In some cases the firmware expects cbndx 1 to be assigned to the GMU,
> so we also want the default domain for the GMU to be an identy domain.
> This way it does not get a context bank assigned. Without this, both
> of_dma_configure() and drm/msm's iommu_domain_attach() will trigger
> allocating and configuring a context bank. So GMU ends up attached to
> both cbndx 1 and later cbndx 2. This arrangement seemingly confounds
> and surprises the firmware if the GPU later triggers a translation
> fault, resulting (on sc8280xp / lenovo x13s, at least) in the SMMU
> getting wedged and the GPU stuck without memory access.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Rob Clark <robdclark@chromium.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
next prev parent reply other threads:[~2023-12-11 10:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-10 18:06 [PATCH v2] iommu/arm-smmu-qcom: Add missing GMU entry to match table Rob Clark
2023-12-11 10:11 ` Johan Hovold [this message]
2023-12-11 22:58 ` Robin Murphy
2023-12-12 17:21 ` Will Deacon
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