[PATCH 5/5] iommu: Allow default domain type to be set on the kernel command line

[Will Deacon]

The IOMMU core currently initialises the default domain for each group
to IOMMU_DOMAIN_DMA, under the assumption that devices will use
IOMMU-backed DMA ops by default. However, in some cases it is desirable
for the DMA ops to bypass the IOMMU for performance reasons, reserving
use of translation for subsystems such as VFIO that require it for
enforcing device isolation.

Rather than modify each IOMMU driver to provide different semantics for
DMA domains, instead we introduce a command line parameter that can be
used to change the type of the default domain. Passthrough can then be
specified using "iommu.default_domain=identity" on the kernel command
line.

Signed-off-by: Will Deacon <will.deacon at arm.com>
---
 drivers/iommu/iommu.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index dbe7f653bb7c..69f7f1a75543 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -36,6 +36,7 @@
 
 static struct kset *iommu_group_kset;
 static DEFINE_IDA(iommu_group_ida);
+static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA;
 
 struct iommu_callback_data {
 	const struct iommu_ops *ops;
@@ -86,6 +87,20 @@ static int __iommu_attach_group(struct iommu_domain *domain,
 static void __iommu_detach_group(struct iommu_domain *domain,
 				 struct iommu_group *group);
 
+static int __init iommu_set_def_domain_type(char *str)
+{
+	if (!str)
+		return -EINVAL;
+
+	if (!strcmp(str, "identity"))
+		iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
+	else if (!strcmp(str, "dma"))
+		iommu_def_domain_type = IOMMU_DOMAIN_DMA;
+
+	return 0;
+}
+early_param("iommu.default_domain", iommu_set_def_domain_type);
+
 static ssize_t iommu_group_attr_show(struct kobject *kobj,
 				     struct attribute *__attr, char *buf)
 {
@@ -847,8 +862,8 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 	 * IOMMU driver.
 	 */
 	if (!group->default_domain) {
-		group->default_domain = __iommu_domain_alloc(dev->bus,
-							     IOMMU_DOMAIN_DMA);
+		group->default_domain =
+			__iommu_domain_alloc(dev->bus, iommu_def_domain_type);
 		if (!group->domain)
 			group->domain = group->default_domain;
 	}
-- 
2.1.4