From b0119e870837dcd15a207b4701542ebac5d19b45 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Wed, 1 Feb 2017 13:23:08 +0100 Subject: iommu: Introduce new 'struct iommu_device' This struct represents one hardware iommu in the iommu core code. For now it only has the iommu-ops associated with it, but that will be extended soon. The register/unregister interface is also added, as well as making use of it in the Intel and AMD IOMMU drivers. Signed-off-by: Joerg Roedel --- include/linux/iommu.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'include/linux/iommu.h') diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 085e1f0e6c07..900ddd212364 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -204,6 +204,26 @@ struct iommu_ops { unsigned long pgsize_bitmap; }; +/** + * struct iommu_device - IOMMU core representation of one IOMMU hardware + * instance + * @list: Used by the iommu-core to keep a list of registered iommus + * @ops: iommu-ops for talking to this iommu + */ +struct iommu_device { + struct list_head list; + const struct iommu_ops *ops; +}; + +int iommu_device_register(struct iommu_device *iommu); +void iommu_device_unregister(struct iommu_device *iommu); + +static inline void iommu_device_set_ops(struct iommu_device *iommu, + const struct iommu_ops *ops) +{ + iommu->ops = ops; +} + #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */ #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */ #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */ @@ -361,6 +381,7 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode); struct iommu_ops {}; struct iommu_group {}; struct iommu_fwspec {}; +struct iommu_device {}; static inline bool iommu_present(struct bus_type *bus) { @@ -558,6 +579,20 @@ static inline void iommu_device_destroy(struct device *dev) { } +static inline int iommu_device_register(struct iommu_device *iommu) +{ + return -ENODEV; +} + +static inline void iommu_device_set_ops(struct iommu_device *iommu, + const struct iommu_ops *ops) +{ +} + +static inline void iommu_device_unregister(struct iommu_device *iommu) +{ +} + static inline int iommu_device_link(struct device *dev, struct device *link) { return -EINVAL; -- cgit