Messages in this thread | | | Subject | Re: [PATCH v3 1/3] iommu/arm-smmu: Add support for driver IOMMU fault handlers | From | Robin Murphy <> | Date | Tue, 2 Mar 2021 12:17:24 +0000 |
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On 2021-02-25 17:51, Jordan Crouse wrote: > Call report_iommu_fault() to allow upper-level drivers to register their > own fault handlers. > > Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> > --- > > drivers/iommu/arm/arm-smmu/arm-smmu.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c > index d8c6bfde6a61..0f3a9b5f3284 100644 > --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c > +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c > @@ -408,6 +408,7 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev) > struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); > struct arm_smmu_device *smmu = smmu_domain->smmu; > int idx = smmu_domain->cfg.cbndx; > + int ret; > > fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR); > if (!(fsr & ARM_SMMU_FSR_FAULT)) > @@ -417,8 +418,12 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev) > iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR); > cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(idx)); > > - dev_err_ratelimited(smmu->dev, > - "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n", > + ret = report_iommu_fault(domain, dev, iova,
Beware that "dev" here is not a struct device, so this isn't right. I'm not entirely sure what we *should* be passing here, since we can't easily attribute a context fault to a specific client device, and passing the IOMMU device seems a bit dubious too, so maybe just NULL?
Robin.
> + fsynr & ARM_SMMU_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ); > + > + if (ret == -ENOSYS) > + dev_err_ratelimited(smmu->dev, > + "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n", > fsr, iova, fsynr, cbfrsynra, idx); > > arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, fsr); >
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