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

mainline inclusion
from mainline-remotes/origin/next
commit 24b6c779
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5RP8T
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git/commit/?id=24b6c7798a0122012ca848ea0d25e973334266b0

--------------------------------------------------------------------------

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
as passthrough.
Acked-by: NWill Deacon <will@kernel.org>
Signed-off-by: NYicong Yang <yangyicong@hisilicon.com>
Reviewed-by: NJohn Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20220816114414.4092-2-yangyicong@huawei.comSigned-off-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: NWangming Shao <shaowangming@h-partners.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -4315,6 +4315,26 @@ static int arm_smmu_device_set_config(struct device *dev, int type, void *data)
 	}
 }
 
+/*
+ * HiSilicon PCIe tune and trace device can be used to trace TLP headers on the
+ * PCIe link and save the data to memory by DMA. The hardware is restricted to
+ * use identity mapping only.
+ */
+#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,
@@ -4350,6 +4370,7 @@ 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,
 	.aux_attach_dev		= arm_smmu_aux_attach_dev,
 	.aux_detach_dev		= arm_smmu_aux_detach_dev,
 	.aux_get_pasid		= arm_smmu_aux_get_pasid,