Re: [PATCH v7 1/7] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity

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On 07/04/2022 13:58, Yicong Yang wrote:
The DMA operations of HiSilicon PTT device can only work properly with
identical mappings. So add a quirk for the device to force the domain

I'm not sure if you meant to write "identity mappings".

as passthrough.

Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>

FWIW,

Reviewed-by: John Garry <john.garry@xxxxxxxxxx>

---
  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 627a3ed5ee8f..5ec15ae2a9b1 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2839,6 +2839,21 @@ 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,
@@ -2856,6 +2871,7 @@ 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,
  	.default_domain_ops = &(const struct iommu_domain_ops) {




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