iommu/tegra: gart: Allow only one active domain at a time (7d849b7b) · Commits · 戴 / test

drivers/iommu/tegra-gart.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -57,6 +57,7 @@ struct gart_device {
		spinlock_t pte_lock; /* for pagetable */
		struct list_head client;
		spinlock_t client_lock; /* for client list */
		struct iommu_domain active_domain; / current active domain */
		struct device *dev;

		struct iommu_device iommu; /* IOMMU Core handle */
		@@ -186,6 +187,12 @@ static int gart_iommu_attach_dev(struct iommu_domain *domain,
		goto fail;
		}
		}
		if (gart->active_domain && gart->active_domain != domain) {
		dev_err(gart->dev, "Only one domain can be active at a time\n");
		err = -EINVAL;
		goto fail;
		}
		gart->active_domain = domain;
		list_add(&client->list, &gart->client);
		spin_unlock(&gart->client_lock);
		dev_dbg(gart->dev, "Attached %s\n", dev_name(dev));
		@@ -208,6 +215,8 @@ static void __gart_iommu_detach_dev(struct iommu_domain *domain,
		if (c->dev == dev) {
		list_del(&c->list);
		devm_kfree(gart->dev, c);
		if (list_empty(&gart->client))
		gart->active_domain = NULL;
		dev_dbg(gart->dev, "Detached %s\n", dev_name(dev));
		return;
		}