[PATCH v3 8/8] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity

[Yicong Yang]

Hi Robin,

Is this quirk ok with the SMMU v3 driver? Just want to confirm that I'm on the
right way to dealing with the issue of our device.

Thanks.

On 2022/1/24 21:11, Yicong Yang wrote:
> The DMA of HiSilicon PTT device can only work with identical
> mapping. So add a quirk for the device to force the domain
> passthrough.
> 
> Signed-off-by: Yicong Yang <yangyicong at hisilicon.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 6dc6d8b6b368..6f67a2b1dd27 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2838,6 +2838,21 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
>  	}
>  }
>  
> +#define IS_HISI_PTT_DEVICE(pdev)	((pdev)->vendor == PCI_VENDOR_ID_HUAWEI && \
> +					 (pdev)->device == 0xa12e)
> +
> +static int arm_smmu_def_domain_type(struct device *dev)
> +{
> +	if (dev_is_pci(dev)) {
> +		struct pci_dev *pdev = to_pci_dev(dev);
> +
> +		if (IS_HISI_PTT_DEVICE(pdev))
> +			return IOMMU_DOMAIN_IDENTITY;
> +	}
> +
> +	return 0;
> +}
> +
>  static struct iommu_ops arm_smmu_ops = {
>  	.capable		= arm_smmu_capable,
>  	.domain_alloc		= arm_smmu_domain_alloc,
> @@ -2863,6 +2878,7 @@ static struct iommu_ops arm_smmu_ops = {
>  	.sva_unbind		= arm_smmu_sva_unbind,
>  	.sva_get_pasid		= arm_smmu_sva_get_pasid,
>  	.page_response		= arm_smmu_page_response,
> +	.def_domain_type	= arm_smmu_def_domain_type,
>  	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
>  	.owner			= THIS_MODULE,
>  };
>