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From: Rob Clark <robdclark@gmail.com>
To: iommu@lists.linux-foundation.org
Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	Robin Murphy <robin.murphy@arm.com>,
	Johan Hovold <johan@kernel.org>,
	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>,
	linux-arm-kernel@lists.infradead.org (moderated list:ARM SMMU
	DRIVERS), iommu@lists.linux.dev (open list:IOMMU SUBSYSTEM),
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2] iommu/arm-smmu-qcom: Add missing GMU entry to match table
Date: Sun, 10 Dec 2023 10:06:53 -0800	[thread overview]
Message-ID: <20231210180655.75542-1-robdclark@gmail.com> (raw)

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>
---

I didn't add a fixes tag because really this issue has been there
all along, but either didn't matter with other firmware or we didn't 
notice the problem.

 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 549ae4dba3a6..d326fa230b96 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -243,6 +243,7 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
 
 static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
 	{ .compatible = "qcom,adreno" },
+	{ .compatible = "qcom,adreno-gmu" },
 	{ .compatible = "qcom,mdp4" },
 	{ .compatible = "qcom,mdss" },
 	{ .compatible = "qcom,sc7180-mdss" },
-- 
2.43.0


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WARNING: multiple messages have this Message-ID (diff)
From: Rob Clark <robdclark@gmail.com>
To: iommu@lists.linux-foundation.org
Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	Robin Murphy <robin.murphy@arm.com>,
	Johan Hovold <johan@kernel.org>,
	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>,
	linux-arm-kernel@lists.infradead.org (moderated list:ARM SMMU
	DRIVERS), iommu@lists.linux.dev (open list:IOMMU SUBSYSTEM),
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2] iommu/arm-smmu-qcom: Add missing GMU entry to match table
Date: Sun, 10 Dec 2023 10:06:53 -0800	[thread overview]
Message-ID: <20231210180655.75542-1-robdclark@gmail.com> (raw)

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>
---

I didn't add a fixes tag because really this issue has been there
all along, but either didn't matter with other firmware or we didn't 
notice the problem.

 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 549ae4dba3a6..d326fa230b96 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -243,6 +243,7 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
 
 static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
 	{ .compatible = "qcom,adreno" },
+	{ .compatible = "qcom,adreno-gmu" },
 	{ .compatible = "qcom,mdp4" },
 	{ .compatible = "qcom,mdss" },
 	{ .compatible = "qcom,sc7180-mdss" },
-- 
2.43.0


             reply	other threads:[~2023-12-10 18:07 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-10 18:06 Rob Clark [this message]
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
2023-12-11 10:11   ` Johan Hovold
2023-12-11 22:58 ` Robin Murphy
2023-12-11 22:58   ` Robin Murphy
2023-12-12 17:21 ` Will Deacon
2023-12-12 17:21   ` Will Deacon

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