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virtio: Introduce vringh wrappers in virtio_config

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Add wrappers for the host vrings to support loose
coupling between the virtio device and driver.

A new struct vringh_config_ops with the functions
find_vrhs() and del_vrhs() is added to the virtio_device
struct. This enables virtio drivers to manage virtio
host rings without detailed knowledge of how the
vrings are created and deleted.

The function vringh_notify() is added so vringh clients
can notify the other side that buffers are added to the
used-ring.

Cc: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (constified vringh_config)
This commit is contained in:
Sjur Brændeland 2013-03-20 13:51:24 +10:30 • committed by Rusty Russell
parent 1515c5ce26
commit 3beee86a4b
2 changed files with 32 additions and 0 deletions
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29
include/linux/vringh.h
View file

@ -47,6 +47,28 @@ struct vringh {
/* The vring (note: it may contain user pointers!) */
struct vring vring;
/* The function to call to notify the guest about added buffers */
void (*notify)(struct vringh *);
};
/**
* struct vringh_config_ops - ops for creating a host vring from a virtio driver
* @find_vrhs: find the host vrings and instantiate them
* vdev: the virtio_device
* nhvrs: the number of host vrings to find
* hvrs: on success, includes new host vrings
* callbacks: array of driver callbacks, for each host vring
* include a NULL entry for vqs that do not need a callback
* Returns 0 on success or error status
* @del_vrhs: free the host vrings found by find_vrhs().
*/
struct virtio_device;
typedef void vrh_callback_t(struct virtio_device *, struct vringh *);
struct vringh_config_ops {
int (*find_vrhs)(struct virtio_device *vdev, unsigned nhvrs,
struct vringh *vrhs[], vrh_callback_t *callbacks[]);
void (*del_vrhs)(struct virtio_device *vdev);
};
/* The memory the vring can access, and what offset to apply. */
@ -193,4 +215,11 @@ void vringh_notify_disable_kern(struct vringh *vrh);
int vringh_need_notify_kern(struct vringh *vrh);
/* Notify the guest about buffers added to the used ring */
static inline void vringh_notify(struct vringh *vrh)
{
if (vrh->notify)
vrh->notify(vrh);
}
#endif /* _LINUX_VRINGH_H */