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Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r--include/linux/iommu.h33
1 files changed, 30 insertions, 3 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 38daa453f2e5..0546b8710ce3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -51,9 +51,33 @@ struct iommu_domain_geometry {
bool force_aperture; /* DMA only allowed in mappable range? */
};
+/* Domain feature flags */
+#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
+#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
+ implementation */
+#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
+
+/*
+ * This are the possible domain-types
+ *
+ * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
+ * devices
+ * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
+ * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
+ * for VMs
+ * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
+ * This flag allows IOMMU drivers to implement
+ * certain optimizations for these domains
+ */
+#define IOMMU_DOMAIN_BLOCKED (0U)
+#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
+#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
+#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
+ __IOMMU_DOMAIN_DMA_API)
+
struct iommu_domain {
+ unsigned type;
const struct iommu_ops *ops;
- void *priv;
iommu_fault_handler_t handler;
void *handler_token;
struct iommu_domain_geometry geometry;
@@ -113,8 +137,11 @@ enum iommu_attr {
*/
struct iommu_ops {
bool (*capable)(enum iommu_cap);
- int (*domain_init)(struct iommu_domain *domain);
- void (*domain_destroy)(struct iommu_domain *domain);
+
+ /* Domain allocation and freeing by the iommu driver */
+ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
+ void (*domain_free)(struct iommu_domain *);
+
int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
int (*map)(struct iommu_domain *domain, unsigned long iova,