iommu/arm-smmu: Add support for driver IOMMU fault handlers
Call report_iommu_fault() to allow upper-level drivers to register their own fault handlers. Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rob Clark <robdclark@chromium.org> Acked-by: Will Deacon <will@kernel.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20210610214431.539029-2-robdclark@gmail.com Signed-off-by: Rob Clark <robdclark@chromium.org>
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@ -408,6 +408,7 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
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struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
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struct arm_smmu_device *smmu = smmu_domain->smmu;
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int idx = smmu_domain->cfg.cbndx;
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int ret;
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fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR);
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if (!(fsr & ARM_SMMU_FSR_FAULT))
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@ -417,8 +418,12 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
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iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR);
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cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(idx));
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dev_err_ratelimited(smmu->dev,
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"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
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ret = report_iommu_fault(domain, NULL, iova,
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fsynr & ARM_SMMU_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
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if (ret == -ENOSYS)
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dev_err_ratelimited(smmu->dev,
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"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
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fsr, iova, fsynr, cbfrsynra, idx);
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arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, fsr);
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