Re: [RFC 6/7] iommu/vt-d: convert the intel iommu driver to the dma-iommu ops api

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Hi,

On 5/4/19 9:23 PM, Tom Murphy wrote:
static int intel_iommu_add_device(struct device *dev)
  {
+	struct dmar_domain *dmar_domain;
+	struct iommu_domain *domain;
  	struct intel_iommu *iommu;
  	struct iommu_group *group;
-	struct iommu_domain *domain;
+	dma_addr_t base;
  	u8 bus, devfn;
iommu = device_to_iommu(dev, &bus, &devfn);
@@ -4871,9 +4514,12 @@ static int intel_iommu_add_device(struct device *dev)
  	if (IS_ERR(group))
  		return PTR_ERR(group);
+ base = IOVA_START_PFN << VTD_PAGE_SHIFT;
  	domain = iommu_get_domain_for_dev(dev);
+	dmar_domain = to_dmar_domain(domain);
  	if (domain->type == IOMMU_DOMAIN_DMA)
-		dev->dma_ops = &intel_dma_ops;
+		iommu_setup_dma_ops(dev, base,
+				__DOMAIN_MAX_ADDR(dmar_domain->gaw) - base);

I didn't find the implementation of iommu_setup_dma_ops() in this
series. Will the iova resource be initialized in this function?

If so, will this block iommu_group_create_direct_mappings() which
reserves and maps the reserved iova ranges.

iommu_group_put(group);
  	return 0;
@@ -5002,19 +4648,6 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sd
  	return ret;
  }
-static void intel_iommu_apply_resv_region(struct device *dev,
-					  struct iommu_domain *domain,
-					  struct iommu_resv_region *region)
-{
-	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
-	unsigned long start, end;
-
-	start = IOVA_PFN(region->start);
-	end   = IOVA_PFN(region->start + region->length - 1);
-
-	WARN_ON_ONCE(!reserve_iova(&dmar_domain->iovad, start, end));
-}
-
  struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
  {
  	struct intel_iommu *iommu;
@@ -5050,13 +4683,13 @@ const struct iommu_ops intel_iommu_ops = {
  	.detach_dev		= intel_iommu_detach_device,
  	.map			= intel_iommu_map,
  	.unmap			= intel_iommu_unmap,
+	.flush_iotlb_all	= iommu_flush_iova,
  	.flush_iotlb_range	= intel_iommu_flush_iotlb_range,
  	.iova_to_phys		= intel_iommu_iova_to_phys,
  	.add_device		= intel_iommu_add_device,
  	.remove_device		= intel_iommu_remove_device,
  	.get_resv_regions	= intel_iommu_get_resv_regions,
  	.put_resv_regions	= intel_iommu_put_resv_regions,
-	.apply_resv_region	= intel_iommu_apply_resv_region,

With this removed, how will iommu_group_create_direct_mappings() work?

Best regards,
Lu Baolu



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