[PATCH 8/8] iommu/arm-smmu-qcom: Add stream_mapping_reset detail to QCOM SMMUv2
From: <hidden>
Date: 2020-09-26 13:00:35
Also in:
linux-arm-kernel, linux-arm-msm, lkml, phone-devel
Subsystem:
arm smmu drivers, iommu subsystem, qualcomm iommu, the rest · Maintainers:
Will Deacon, Joerg Roedel, Rob Clark, Linus Torvalds
From: AngeloGioacchino Del Regno <redacted> 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 <redacted> --- 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