From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
Jordan Crouse <jcrouse@codeaurora.org>,
Rob Clark <robdclark@gmail.com>,
Akhil P Oommen <akhilpo@codeaurora.org>,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Jordan Crouse <jordan@cosmicpenguin.net>
Subject: [PATCHv4 2/2] iommu/arm-smmu-qcom: Move the adreno smmu specific impl
Date: Tue, 8 Jun 2021 18:00:07 +0530 [thread overview]
Message-ID: <c42181d313fdd440011541a28cde8cd10fffb9d3.1623155117.git.saiprakash.ranjan@codeaurora.org> (raw)
In-Reply-To: <cover.1623155117.git.saiprakash.ranjan@codeaurora.org>
Adreno(GPU) SMMU and APSS(Application Processor SubSystem) SMMU
both implement "arm,mmu-500" in some QTI SoCs and to run through
adreno smmu specific implementation such as enabling split pagetables
support, we need to match the "qcom,adreno-smmu" compatible first
before apss smmu or else we will be running apps smmu implementation
for adreno smmu and the additional features for adreno smmu is never
set. For ex: we have "qcom,sc7280-smmu-500" compatible for both apps
and adreno smmu implementing "arm,mmu-500", so the adreno smmu
implementation is never reached because the current sequence checks
for apps smmu compatible(qcom,sc7280-smmu-500) first and runs that
specific impl and we never reach adreno smmu specific implementation.
Suggested-by: Akhil P Oommen <akhilpo@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Jordan Crouse <jordan@cosmicpenguin.net>
---
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index e93b5dbda7de..83c32566bf64 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -370,11 +370,17 @@ struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu)
return qcom_smmu_create(smmu, &qcom_smmu_impl);
}
- if (of_match_node(qcom_smmu_impl_of_match, np))
- return qcom_smmu_create(smmu, &qcom_smmu_impl);
-
+ /*
+ * Do not change this order of implementation, i.e., first adreno
+ * smmu impl and then apss smmu since we can have both implementing
+ * arm,mmu-500 in which case we will miss setting adreno smmu specific
+ * features if the order is changed.
+ */
if (of_device_is_compatible(np, "qcom,adreno-smmu"))
return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl);
+ if (of_match_node(qcom_smmu_impl_of_match, np))
+ return qcom_smmu_create(smmu, &qcom_smmu_impl);
+
return smmu;
}
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2021-06-08 12:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-08 12:30 [PATCHv4 0/2] iommu/arm-smmu-qcom: Add SC7280 support Sai Prakash Ranjan
2021-06-08 12:30 ` [PATCHv4 1/2] iommu/arm-smmu-qcom: Add SC7280 SMMU compatible Sai Prakash Ranjan
2021-06-08 12:30 ` Sai Prakash Ranjan [this message]
2021-06-08 17:16 ` [PATCHv4 0/2] iommu/arm-smmu-qcom: Add SC7280 support Will Deacon
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