This is quite useful for debugging. Currently, always TERMINATE the
translation when the fault handler returns (since this is all we need
for debugging drivers). But I expect the SVM work should eventually
let us do something more clever.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
---
drivers/iommu/qcom_iommu.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index c8a587d034b0..3c6866d94e64 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -66,6 +66,7 @@ struct qcom_iommu_ctx {
void __iomem *base;
bool secure_init;
u8 asid; /* asid and ctx bank # are 1:1 */
+ struct iommu_domain *domain;
};
struct qcom_iommu_domain {
@@ -194,12 +195,15 @@ static irqreturn_t qcom_iommu_fault(int irq, void *dev)
fsynr = iommu_readl(ctx, ARM_SMMU_CB_FSYNR0);
iova = iommu_readq(ctx, ARM_SMMU_CB_FAR);
- dev_err_ratelimited(ctx->dev,
- "Unhandled context fault: fsr=0x%x, "
- "iova=0x%016llx, fsynr=0x%x, cb=%d\n",
- fsr, iova, fsynr, ctx->asid);
+ if (!report_iommu_fault(ctx->domain, ctx->dev, iova, 0)) {
+ dev_err_ratelimited(ctx->dev,
+ "Unhandled context fault: fsr=0x%x, "
+ "iova=0x%016llx, fsynr=0x%x, cb=%d\n",
+ fsr, iova, fsynr, ctx->asid);
+ }
iommu_writel(ctx, ARM_SMMU_CB_FSR, fsr);
+ iommu_writel(ctx, ARM_SMMU_CB_RESUME, RESUME_TERMINATE);
return IRQ_HANDLED;
}
@@ -280,6 +284,8 @@ static int qcom_iommu_init_domain(struct iommu_domain *domain,
reg |= SCTLR_E;
iommu_writel(ctx, ARM_SMMU_CB_SCTLR, reg);
+
+ ctx->domain = domain;
}
mutex_unlock(&qcom_domain->init_mutex);
@@ -395,6 +401,8 @@ static void qcom_iommu_detach_dev(struct iommu_domain *domain, struct device *de
/* Disable the context bank: */
iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0);
+
+ ctx->domain = NULL;
}
pm_runtime_put_sync(qcom_iommu->dev);
--
2.13.6
--
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