From: AngeloGioacchino Del Regno <[email protected]> On some Qualcomm SoCs with certain hypervisor configurations, writing the streamid masks to the SMRs will trigger a hyp-fault and crash the system.
This is seen on at least Qualcomm SDM630, SDM636 and SDM660. Signed-off-by: AngeloGioacchino Del Regno <[email protected]> --- 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 f5bbfe86ef30..b18e70bddf29 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -85,8 +85,21 @@ static int qcom_smmuv2_cfg_probe(struct arm_smmu_device *smmu) return 0; } +static void qcom_smmuv2_test_smr_masks(struct arm_smmu_device *smmu) +{ + /* + * Broken firmware quirk: + * On some Qualcomm SoCs with certain hypervisor configurations, + * writing the streamid masks to the SMRs will trigger a hyp-fault + * and crash the system. + */ + smmu->streamid_mask = 0x7FFF; + smmu->smr_mask_mask = 0x7FFF; +} + static const struct arm_smmu_impl qcom_smmuv2_impl = { .cfg_probe = qcom_smmuv2_cfg_probe, + .test_smr_masks = qcom_smmuv2_test_smr_masks, }; struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) -- 2.28.0
