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SubjectRe: [PATCH v3 1/3] iommu/arm-smmu: Add support for driver IOMMU fault handlers
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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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