Re: [PATCH v3 16/34] iommu/vt-d: Convert to probe/release_device() call-backs

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On 2020/4/29 21:36, Joerg Roedel wrote:
From: Joerg Roedel <jroedel@xxxxxxx>

Convert the Intel IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>

Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Best regards,
baolu

---
  drivers/iommu/intel-iommu.c | 67 ++++---------------------------------
  1 file changed, 6 insertions(+), 61 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b9f905a55dda..b906727f5b85 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5781,78 +5781,27 @@ static bool intel_iommu_capable(enum iommu_cap cap)
  	return false;
  }
-static int intel_iommu_add_device(struct device *dev)
+static struct iommu_device *intel_iommu_probe_device(struct device *dev)
  {
-	struct dmar_domain *dmar_domain;
-	struct iommu_domain *domain;
  	struct intel_iommu *iommu;
-	struct iommu_group *group;
  	u8 bus, devfn;
-	int ret;
iommu = device_to_iommu(dev, &bus, &devfn);
  	if (!iommu)
-		return -ENODEV;
-
-	iommu_device_link(&iommu->iommu, dev);
+		return ERR_PTR(-ENODEV);
if (translation_pre_enabled(iommu))
  		dev->archdata.iommu = DEFER_DEVICE_DOMAIN_INFO;
- group = iommu_group_get_for_dev(dev);
-
-	if (IS_ERR(group)) {
-		ret = PTR_ERR(group);
-		goto unlink;
-	}
-
-	iommu_group_put(group);
-
-	domain = iommu_get_domain_for_dev(dev);
-	dmar_domain = to_dmar_domain(domain);
-	if (domain->type == IOMMU_DOMAIN_DMA) {
-		if (device_def_domain_type(dev) == IOMMU_DOMAIN_IDENTITY) {
-			ret = iommu_request_dm_for_dev(dev);
-			if (ret) {
-				dmar_remove_one_dev_info(dev);
-				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
-				domain_add_dev_info(si_domain, dev);
-				dev_info(dev,
-					 "Device uses a private identity domain.\n");
-			}
-		}
-	} else {
-		if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) {
-			ret = iommu_request_dma_domain_for_dev(dev);
-			if (ret) {
-				dmar_remove_one_dev_info(dev);
-				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
-				if (!get_private_domain_for_dev(dev)) {
-					dev_warn(dev,
-						 "Failed to get a private domain.\n");
-					ret = -ENOMEM;
-					goto unlink;
-				}
-
-				dev_info(dev,
-					 "Device uses a private dma domain.\n");
-			}
-		}
-	}
-
  	if (device_needs_bounce(dev)) {
  		dev_info(dev, "Use Intel IOMMU bounce page dma_ops\n");
  		set_dma_ops(dev, &bounce_dma_ops);
  	}
- return 0;
-
-unlink:
-	iommu_device_unlink(&iommu->iommu, dev);
-	return ret;
+	return &iommu->iommu;
  }
-static void intel_iommu_remove_device(struct device *dev)
+static void intel_iommu_release_device(struct device *dev)
  {
  	struct intel_iommu *iommu;
  	u8 bus, devfn;
@@ -5863,10 +5812,6 @@ static void intel_iommu_remove_device(struct device *dev)
dmar_remove_one_dev_info(dev); - iommu_group_remove_device(dev);
-
-	iommu_device_unlink(&iommu->iommu, dev);
-
  	if (device_needs_bounce(dev))
  		set_dma_ops(dev, NULL);
  }
@@ -6198,8 +6143,8 @@ const struct iommu_ops intel_iommu_ops = {
  	.map			= intel_iommu_map,
  	.unmap			= intel_iommu_unmap,
  	.iova_to_phys		= intel_iommu_iova_to_phys,
-	.add_device		= intel_iommu_add_device,
-	.remove_device		= intel_iommu_remove_device,
+	.probe_device		= intel_iommu_probe_device,
+	.release_device		= intel_iommu_release_device,
  	.get_resv_regions	= intel_iommu_get_resv_regions,
  	.put_resv_regions	= generic_iommu_put_resv_regions,
  	.apply_resv_region	= intel_iommu_apply_resv_region,




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