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From: kholk11@gmail.com
To: will@kernel.org
Cc: robin.murphy@arm.com, joro@8bytes.org,
	bjorn.andersson@linaro.org, linux-arm-kernel@lists.infradead.org,
	devicetree@vger.kernel.org, kholk11@gmail.com,
	marijns95@gmail.com, konradybcio@gmail.com,
	martin.botka1@gmail.com, linux-arm-msm@vger.kernel.org,
	phone-devel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 8/8] iommu/arm-smmu-qcom: Add stream_mapping_reset detail to QCOM SMMUv2
Date: Sat, 26 Sep 2020 15:00:04 +0200
Message-ID: <20200926130004.13528-9-kholk11@gmail.com> (raw)
In-Reply-To: <20200926130004.13528-1-kholk11@gmail.com>

From: AngeloGioacchino Del Regno <kholk11@gmail.com>

On some Qualcomm SoCs with certain hypervisor configurations,
some context banks are hyp-protected and cannot be disabled,
nor the relative S2CRs can be set as bypass, or a hyp-fault
will be triggered and the system will hang.

This is seen on at least Qualcomm SDM630, SDM636 and SDM660.

Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index b18e70bddf29..364908cc2adf 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -85,6 +85,18 @@ static int qcom_smmuv2_cfg_probe(struct arm_smmu_device *smmu)
 	return 0;
 }
 
+static void qcom_smmuv2_stream_mapping_reset(struct arm_smmu_device *smmu)
+{
+	/*
+	 * Broken firmware quirk:
+	 * On some Qualcomm SoCs with certain hypervisor configurations,
+	 * some context banks are hyp-protected and cannot be disabled,
+	 * nor the relative S2CRs can be set as bypass, or a hyp-fault
+	 * will be triggered and the system will hang.
+	 */
+	return;
+}
+
 static void qcom_smmuv2_test_smr_masks(struct arm_smmu_device *smmu)
 {
 	/*
@@ -99,6 +111,7 @@ static void qcom_smmuv2_test_smr_masks(struct arm_smmu_device *smmu)
 
 static const struct arm_smmu_impl qcom_smmuv2_impl = {
 	.cfg_probe = qcom_smmuv2_cfg_probe,
+	.stream_mapping_reset = qcom_smmuv2_stream_mapping_reset,
 	.test_smr_masks = qcom_smmuv2_test_smr_masks,
 };
 
-- 
2.28.0


  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-26 12:59 [PATCH 0/8] Implement firmware quirks for Qualcomm ARM-SMMUv2 kholk11
2020-09-26 12:59 ` [PATCH 1/8] iommu/arm-smmu-qcom: Rename qcom_smmu_impl to qcom_smmu500_impl kholk11
2020-09-26 12:59 ` [PATCH 2/8] iommu/arm-smmu-qcom: Add QC SMMUv2 VA Size quirk for SDM660 kholk11
2020-10-14 15:43   ` Robin Murphy
2020-09-26 12:59 ` [PATCH 3/8] dt-bindings: arm-smmu: add binding for SMMUv2 on Qualcomm SDM660 kholk11
2020-09-29 19:10   ` Rob Herring
2020-09-26 13:00 ` [PATCH 4/8] iommu/arm-smmu: Support test_smr_masks implementation detail deviation kholk11
2020-10-14 15:52   ` Robin Murphy
2020-09-26 13:00 ` [PATCH 5/8] iommu/arm-smmu-qcom: Add test_smr_masks detail to QCOM SMMUv2 kholk11
2020-09-26 13:00 ` [PATCH 6/8] iommu/arm-smmu: Move stream mapping reset to separate function kholk11
2020-10-14 15:56   ` Robin Murphy
2020-09-26 13:00 ` [PATCH 7/8] iommu/arm-smmu: Support stream_mapping_reset implementation detail kholk11
2020-09-26 13:00 ` kholk11 [this message]
2020-10-14 22:14   ` [PATCH 8/8] iommu/arm-smmu-qcom: Add stream_mapping_reset detail to QCOM SMMUv2 Bjorn Andersson

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