diff options
Diffstat (limited to 'include/linux/vdpa.h')
| -rw-r--r-- | include/linux/vdpa.h | 66 |
1 files changed, 60 insertions, 6 deletions
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 239db794357c..eae0bfd87d91 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -28,17 +28,28 @@ struct vdpa_notification_area { }; /** + * vDPA vq_state definition + * @avail_index: available index + */ +struct vdpa_vq_state { + u16 avail_index; +}; + +/** * vDPA device - representation of a vDPA device * @dev: underlying device * @dma_dev: the actual device that is performing DMA * @config: the configuration ops for this device. * @index: device index + * @features_valid: were features initialized? for legacy guests */ struct vdpa_device { struct device dev; struct device *dma_dev; const struct vdpa_config_ops *config; unsigned int index; + bool features_valid; + int nvqs; }; /** @@ -77,16 +88,22 @@ struct vdpa_device { * @set_vq_state: Set the state for a virtqueue * @vdev: vdpa device * @idx: virtqueue index - * @state: virtqueue state (last_avail_idx) + * @state: pointer to set virtqueue state (last_avail_idx) * Returns integer: success (0) or error (< 0) * @get_vq_state: Get the state for a virtqueue * @vdev: vdpa device * @idx: virtqueue index - * Returns virtqueue state (last_avail_idx) + * @state: pointer to returned state (last_avail_idx) * @get_vq_notification: Get the notification area for a virtqueue * @vdev: vdpa device * @idx: virtqueue index * Returns the notifcation area + * @get_vq_irq: Get the irq number of a virtqueue (optional, + * but must implemented if require vq irq offloading) + * @vdev: vdpa device + * @idx: virtqueue index + * Returns int: irq number of a virtqueue, + * negative number if no irq assigned. * @get_vq_align: Get the virtqueue align requirement * for the device * @vdev: vdpa device @@ -174,10 +191,14 @@ struct vdpa_config_ops { struct vdpa_callback *cb); void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready); bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx); - int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, u64 state); - u64 (*get_vq_state)(struct vdpa_device *vdev, u16 idx); + int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, + const struct vdpa_vq_state *state); + int (*get_vq_state)(struct vdpa_device *vdev, u16 idx, + struct vdpa_vq_state *state); struct vdpa_notification_area (*get_vq_notification)(struct vdpa_device *vdev, u16 idx); + /* vq irq is not expected to be changed once DRIVER_OK is set */ + int (*get_vq_irq)(struct vdpa_device *vdv, u16 idx); /* Device ops */ u32 (*get_vq_align)(struct vdpa_device *vdev); @@ -208,11 +229,12 @@ struct vdpa_config_ops { struct vdpa_device *__vdpa_alloc_device(struct device *parent, const struct vdpa_config_ops *config, + int nvqs, size_t size); -#define vdpa_alloc_device(dev_struct, member, parent, config) \ +#define vdpa_alloc_device(dev_struct, member, parent, config, nvqs) \ container_of(__vdpa_alloc_device( \ - parent, config, \ + parent, config, nvqs, \ sizeof(dev_struct) + \ BUILD_BUG_ON_ZERO(offsetof( \ dev_struct, member))), \ @@ -266,4 +288,36 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) { return vdev->dma_dev; } + +static inline void vdpa_reset(struct vdpa_device *vdev) +{ + const struct vdpa_config_ops *ops = vdev->config; + + vdev->features_valid = false; + ops->set_status(vdev, 0); +} + +static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) +{ + const struct vdpa_config_ops *ops = vdev->config; + + vdev->features_valid = true; + return ops->set_features(vdev, features); +} + + +static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset, + void *buf, unsigned int len) +{ + const struct vdpa_config_ops *ops = vdev->config; + + /* + * Config accesses aren't supposed to trigger before features are set. + * If it does happen we assume a legacy guest. + */ + if (!vdev->features_valid) + vdpa_set_features(vdev, 0); + ops->get_config(vdev, offset, buf, len); +} + #endif /* _LINUX_VDPA_H */ |