Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

[firefly-linux-kernel-4.4.55.git] / include / linux / iommu.h

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0546b8710ce308540abd841944aee07ba24fedfb..dc767f7c3704639da944153e8bdae7cf40cd804d 100644 (file)
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -114,6 +114,20 @@ enum iommu_attr {
        DOMAIN_ATTR_MAX,
 };
 
+/**
+ * struct iommu_dm_region - descriptor for a direct mapped memory region
+ * @list: Linked list pointers
+ * @start: System physical start address of the region
+ * @length: Length of the region in bytes
+ * @prot: IOMMU Protection flags (READ/WRITE/...)
+ */
+struct iommu_dm_region {
+       struct list_head        list;
+       phys_addr_t             start;
+       size_t                  length;
+       int                     prot;
+};
+
 #ifdef CONFIG_IOMMU_API
 
 /**
@@ -159,6 +173,10 @@ struct iommu_ops {
        int (*domain_set_attr)(struct iommu_domain *domain,
                               enum iommu_attr attr, void *data);
 
+       /* Request/Free a list of direct mapping requirements for a device */
+       void (*get_dm_regions)(struct device *dev, struct list_head *list);
+       void (*put_dm_regions)(struct device *dev, struct list_head *list);
+
        /* Window handling functions */
        int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
                                    phys_addr_t paddr, u64 size, int prot);
@@ -193,6 +211,7 @@ extern int iommu_attach_device(struct iommu_domain *domain,
                               struct device *dev);
 extern void iommu_detach_device(struct iommu_domain *domain,
                                struct device *dev);
+extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
                     phys_addr_t paddr, size_t size, int prot);
 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
@@ -204,6 +223,10 @@ extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t io
 extern void iommu_set_fault_handler(struct iommu_domain *domain,
                        iommu_fault_handler_t handler, void *token);
 
+extern void iommu_get_dm_regions(struct device *dev, struct list_head *list);
+extern void iommu_put_dm_regions(struct device *dev, struct list_head *list);
+extern int iommu_request_dm_for_dev(struct device *dev);
+
 extern int iommu_attach_group(struct iommu_domain *domain,
                              struct iommu_group *group);
 extern void iommu_detach_group(struct iommu_domain *domain,
@@ -227,6 +250,7 @@ extern int iommu_group_unregister_notifier(struct iommu_group *group,
                                           struct notifier_block *nb);
 extern int iommu_group_id(struct iommu_group *group);
 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
+extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 
 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
                                 void *data);
@@ -332,6 +356,11 @@ static inline void iommu_detach_device(struct iommu_domain *domain,
 {
 }
 
+static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
+{
+       return NULL;
+}
+
 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
                            phys_addr_t paddr, int gfp_order, int prot)
 {
@@ -373,6 +402,21 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 {
 }
 
+static inline void iommu_get_dm_regions(struct device *dev,
+                                       struct list_head *list)
+{
+}
+
+static inline void iommu_put_dm_regions(struct device *dev,
+                                       struct list_head *list)
+{
+}
+
+static inline int iommu_request_dm_for_dev(struct device *dev)
+{
+       return -ENODEV;
+}
+
 static inline int iommu_attach_group(struct iommu_domain *domain,
                                     struct iommu_group *group)
 {