iommu/tegra: gart: Allow only one active domain at a time

digetx · joergroedel · commit 7d849b7b40b9 · 2019-01-16T13:54:14.000+01:00
GART has a single address space that is shared by all devices, hence only
one domain could be active at a time.

Signed-off-by: Dmitry Osipenko &lt;digetx@gmail.com&gt;
Acked-by: Thierry Reding &lt;treding@nvidia.com&gt;
Signed-off-by: Joerg Roedel &lt;jroedel@suse.de&gt;
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
@@ -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;
 		}
