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| author |   Sjur Brændeland <sjur.brandeland@stericsson.com> | 2013-03-20 13:51:24 +1030 |
|---|---|---|
| committer |   Rusty Russell <rusty@rustcorp.com.au> | 2013-03-20 14:06:05 +1030 |
| commit | 3beee86a4b9374e38dba36b44e81f1423a0d6b54 (patch) | |
| tree | 5993020791a65623200b45393ccd63b342d5a933 /include/linux/vringh.h | |
| parent | tools/virtio: add vring_test. (diff) | |
| download | linux-dev-3beee86a4b9374e38dba36b44e81f1423a0d6b54.tar.xz linux-dev-3beee86a4b9374e38dba36b44e81f1423a0d6b54.zip | |
virtio: Introduce vringh wrappers in virtio_config
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)
Diffstat (limited to 'include/linux/vringh.h')
| -rw-r--r-- | include/linux/vringh.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/vringh.h b/include/linux/vringh.h index b8f086625c49..749cde28728b 100644 --- a/include/linux/vringh.h +++ b/include/linux/vringh.h @@ -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 */ |