[PATCH 07/10] iommu/vt-d: Wrap the dirty tracking loop to be a helper

[Lu Baolu]

From: Yi Liu <yi.l.liu@xxxxxxxxx>

Add device_set_dirty_tracking() to loop all the devices and set the dirty
tracking per the @enable parameter.

Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240208082307.15759-8-yi.l.liu@xxxxxxxxx
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/iommu/intel/iommu.c | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d286b8554227..2ad8fbe6dc21 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4729,23 +4729,38 @@ static void *intel_iommu_hw_info(struct device *dev, u32 *length, u32 *type)
 	return vtd;
 }
 
+/*
+ * Set dirty tracking for the device list of a domain. The caller must
+ * hold the domain->lock when calling it.
+ */
+static int device_set_dirty_tracking(struct list_head *devices, bool enable)
+{
+	struct device_domain_info *info;
+	int ret = 0;
+
+	list_for_each_entry(info, devices, link) {
+		ret = intel_pasid_setup_dirty_tracking(info->iommu, info->dev,
+						       IOMMU_NO_PASID, enable);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
 static int intel_iommu_set_dirty_tracking(struct iommu_domain *domain,
 					  bool enable)
 {
 	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
-	struct device_domain_info *info;
 	int ret;
 
 	spin_lock(&dmar_domain->lock);
 	if (dmar_domain->dirty_tracking == enable)
 		goto out_unlock;
 
-	list_for_each_entry(info, &dmar_domain->devices, link) {
-		ret = intel_pasid_setup_dirty_tracking(info->iommu, info->dev,
-						       IOMMU_NO_PASID, enable);
-		if (ret)
-			goto err_unwind;
-	}
+	ret = device_set_dirty_tracking(&dmar_domain->devices, enable);
+	if (ret)
+		goto err_unwind;
 
 	dmar_domain->dirty_tracking = enable;
 out_unlock:
@@ -4754,10 +4769,8 @@ static int intel_iommu_set_dirty_tracking(struct iommu_domain *domain,
 	return 0;
 
 err_unwind:
-	list_for_each_entry(info, &dmar_domain->devices, link)
-		intel_pasid_setup_dirty_tracking(info->iommu, info->dev,
-						 IOMMU_NO_PASID,
-						 dmar_domain->dirty_tracking);
+	device_set_dirty_tracking(&dmar_domain->devices,
+				  dmar_domain->dirty_tracking);
 	spin_unlock(&dmar_domain->lock);
 	return ret;
 }
-- 
2.34.1