[PATCH 02/11] iommu: Add helpers to set/get default domain type

Joerg Roedel
2019-08-19T13:22:47Z

Add a couple of functions to allow changing the default
domain type from architecture code and a function for iommu
drivers to request whether the default domain is
passthrough.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/iommu.c | 22 ++++++++++++++++++++++
include/linux/iommu.h | 16 ++++++++++++++++
2 files changed, 38 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3361ca5ef769..84acd47936ac 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2211,6 +2211,28 @@ int iommu_request_dma_domain_for_dev(struct device *dev)
return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA);
}

+void iommu_set_default_passthrough(bool cmd_line)
+{
+ if (cmd_line)
+ iommu_set_cmd_line_dma_api();
+
+ iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
+}
+
+void iommu_set_default_translated(bool cmd_line)
+{
+ if (cmd_line)
+ iommu_set_cmd_line_dma_api();
+
+ iommu_def_domain_type = IOMMU_DOMAIN_DMA;
+}
+
+bool iommu_default_passthrough(void)
+{
+ return iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
+}
+EXPORT_SYMBOL_GPL(iommu_default_passthrough);
+
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
{
const struct iommu_ops *ops = NULL;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index fdc355ccc570..4955498204a9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -413,6 +413,9 @@ extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
extern int iommu_request_dm_for_dev(struct device *dev);
extern int iommu_request_dma_domain_for_dev(struct device *dev);
+extern void iommu_set_default_passthrough(bool cmd_line);
+extern void iommu_set_default_translated(bool cmd_line);
+extern bool iommu_default_passthrough(void);
extern struct iommu_resv_region *
iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
enum iommu_resv_type type);
@@ -694,6 +697,19 @@ static inline int iommu_request_dma_domain_for_dev(struct device *dev)
return -ENODEV;
}

+static inline void iommu_set_default_passthrough(bool cmd_line)
+{
+}
+
+static inline void iommu_set_default_translated(bool cmd_line)
+{
+}
+
+static inline bool iommu_default_passthrough(void)
+{
+ return true;
+}
+
static inline int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group)
{
--
2.16.4