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iommu: Introduce new 'struct iommu_device'

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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 <jroedel@suse.de>
This commit is contained in:
Joerg Roedel
2017-02-01 13:23:08 +01:00
parent c09e22d537
commit b0119e8708
8 changed files with 77 additions and 4 deletions
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35
include/linux/iommu.h
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@@ -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;