On 2019/10/18 下午5:46, Tiwei Bie wrote:
On Thu, Oct 17, 2019 at 06:48:34PM +0800, Jason Wang wrote:
+ * @get_vq_state: Get the state for a virtqueue
+ * @mdev: mediated device
+ * @idx: virtqueue index
+ * Returns virtqueue state (last_avail_idx)
+ * @get_vq_align: Get the virtqueue align requirement
+ * for the device
+ * @mdev: mediated device
+ * Returns virtqueue algin requirement
+ * @get_features: Get virtio features supported by the device
+ * @mdev: mediated device
+ * Returns the virtio features support by the
+ * device
+ * @get_features: Set virtio features supported by the driver
s/get_features/set_features/
Will fix.
+ * configration space
+ * @get_mdev_features: Get the feature of virtio mdev device
+ * @mdev: mediated device
+ * Returns the mdev features (API) support by
+ * the device.
+ * @get_generation: Get device generaton
+ * @mdev: mediated device
+ * Returns u32: device generation
+ */
+struct virtio_mdev_device_ops {
+ /* Virtqueue ops */
+ int (*set_vq_address)(struct mdev_device *mdev,
+ u16 idx, u64 desc_area, u64 driver_area,
+ u64 device_area);
+ void (*set_vq_num)(struct mdev_device *mdev, u16 idx, u32 num);
+ void (*kick_vq)(struct mdev_device *mdev, u16 idx);
+ void (*set_vq_cb)(struct mdev_device *mdev, u16 idx,
+ struct virtio_mdev_callback *cb);
+ void (*set_vq_ready)(struct mdev_device *mdev, u16 idx, bool ready);
+ bool (*get_vq_ready)(struct mdev_device *mdev, u16 idx);
+ int (*set_vq_state)(struct mdev_device *mdev, u16 idx, u64 state);
+ u64 (*get_vq_state)(struct mdev_device *mdev, u16 idx);
+
+ /* Device ops */
+ u16 (*get_vq_align)(struct mdev_device *mdev);
+ u64 (*get_features)(struct mdev_device *mdev);
+ int (*set_features)(struct mdev_device *mdev, u64 features);
+ void (*set_config_cb)(struct mdev_device *mdev,
+ struct virtio_mdev_callback *cb);
+ u16 (*get_vq_num_max)(struct mdev_device *mdev);
+ u32 (*get_device_id)(struct mdev_device *mdev);
+ u32 (*get_vendor_id)(struct mdev_device *mdev);
+ u8 (*get_status)(struct mdev_device *mdev);
+ void (*set_status)(struct mdev_device *mdev, u8 status);
+ void (*get_config)(struct mdev_device *mdev, unsigned int offset,
+ void *buf, unsigned int len);
+ void (*set_config)(struct mdev_device *mdev, unsigned int offset,
+ const void *buf, unsigned int len);
+ u64 (*get_mdev_features)(struct mdev_device *mdev);
Do we need a .set_mdev_features method as well?
Good question. To me I think we may document that the API provides
backward compatibility, so there's no need for set_mdev_features. Or is
there any other chance that we need that?
It's not very clear what does mdev_features mean.
Does it mean the vhost backend features?
https://github.com/torvalds/linux/blob/0e2adab6cf285c41e825b6c74a3aa61324d1132c/include/uapi/linux/vhost.h#L93-L94
Something like this, it's kind of the version of the API, except for the
_F_VERSION_1, the first user should be _F_LOG_ALL. I will add more docs
for this API.
Thanks
+ u32 (*get_generation)(struct mdev_device *mdev);
+};
+
+void mdev_set_virtio_ops(struct mdev_device *mdev,
+ const struct virtio_mdev_device_ops *virtio_ops);
+
+#endif
--
2.19.1
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