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Date: Sat, 26 Sep 2020 15:00:01 +0200 From: kholk11@...il.com To: will@...nel.org Cc: robin.murphy@....com, joro@...tes.org, bjorn.andersson@...aro.org, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, kholk11@...il.com, marijns95@...il.com, konradybcio@...il.com, martin.botka1@...il.com, linux-arm-msm@...r.kernel.org, phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 5/8] iommu/arm-smmu-qcom: Add test_smr_masks detail to QCOM SMMUv2 From: AngeloGioacchino Del Regno <kholk11@...il.com> 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 <kholk11@...il.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 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
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