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ec3d41c4 RR |
1 | #ifndef _LINUX_VIRTIO_H |
2 | #define _LINUX_VIRTIO_H | |
3 | /* Everything a virtio driver needs to work with any particular virtio | |
4 | * implementation. */ | |
5 | #include <linux/types.h> | |
6 | #include <linux/scatterlist.h> | |
7 | #include <linux/spinlock.h> | |
8 | #include <linux/device.h> | |
9 | #include <linux/mod_devicetable.h> | |
bbd603ef | 10 | #include <linux/gfp.h> |
ec3d41c4 RR |
11 | |
12 | /** | |
13 | * virtqueue - a queue to register buffers for sending or receiving. | |
9499f5e7 | 14 | * @list: the chain of virtqueues for this device |
ec3d41c4 | 15 | * @callback: the function to call when buffers are consumed (can be NULL). |
9499f5e7 | 16 | * @name: the name of this virtqueue (mainly for debugging) |
ec3d41c4 | 17 | * @vdev: the virtio device this queue was created for. |
ec3d41c4 RR |
18 | * @priv: a pointer for the virtqueue implementation to use. |
19 | */ | |
9499f5e7 RR |
20 | struct virtqueue { |
21 | struct list_head list; | |
18445c4d | 22 | void (*callback)(struct virtqueue *vq); |
9499f5e7 | 23 | const char *name; |
ec3d41c4 | 24 | struct virtio_device *vdev; |
ec3d41c4 RR |
25 | void *priv; |
26 | }; | |
27 | ||
f96fde41 RR |
28 | int virtqueue_add_buf(struct virtqueue *vq, |
29 | struct scatterlist sg[], | |
30 | unsigned int out_num, | |
31 | unsigned int in_num, | |
32 | void *data, | |
33 | gfp_t gfp); | |
ec3d41c4 | 34 | |
7c5e9ed0 | 35 | void virtqueue_kick(struct virtqueue *vq); |
ec3d41c4 | 36 | |
7c5e9ed0 | 37 | void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len); |
316f25f5 | 38 | |
7c5e9ed0 | 39 | void virtqueue_disable_cb(struct virtqueue *vq); |
316f25f5 | 40 | |
7c5e9ed0 | 41 | bool virtqueue_enable_cb(struct virtqueue *vq); |
316f25f5 | 42 | |
7ab358c2 MT |
43 | bool virtqueue_enable_cb_delayed(struct virtqueue *vq); |
44 | ||
7c5e9ed0 | 45 | void *virtqueue_detach_unused_buf(struct virtqueue *vq); |
316f25f5 | 46 | |
8f9f4668 RJ |
47 | unsigned int virtqueue_get_vring_size(struct virtqueue *vq); |
48 | ||
ec3d41c4 RR |
49 | /** |
50 | * virtio_device - representation of a device using virtio | |
51 | * @index: unique position on the virtio bus | |
52 | * @dev: underlying device. | |
53 | * @id: the device type identification (used to match it with a driver). | |
54 | * @config: the configuration ops for this device. | |
9499f5e7 | 55 | * @vqs: the list of virtqueues for this device. |
c45a6816 | 56 | * @features: the features supported by both driver and device. |
ec3d41c4 RR |
57 | * @priv: private pointer for the driver's use. |
58 | */ | |
9499f5e7 | 59 | struct virtio_device { |
ec3d41c4 RR |
60 | int index; |
61 | struct device dev; | |
62 | struct virtio_device_id id; | |
63 | struct virtio_config_ops *config; | |
9499f5e7 | 64 | struct list_head vqs; |
c45a6816 RR |
65 | /* Note that this is a Linux set_bit-style bitmap. */ |
66 | unsigned long features[1]; | |
ec3d41c4 RR |
67 | void *priv; |
68 | }; | |
69 | ||
86c84373 | 70 | #define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev) |
ec3d41c4 RR |
71 | int register_virtio_device(struct virtio_device *dev); |
72 | void unregister_virtio_device(struct virtio_device *dev); | |
73 | ||
74 | /** | |
75 | * virtio_driver - operations for a virtio I/O driver | |
76 | * @driver: underlying device driver (populate name and owner). | |
77 | * @id_table: the ids serviced by this driver. | |
5f41f8bf | 78 | * @feature_table: an array of feature numbers supported by this driver. |
c45a6816 | 79 | * @feature_table_size: number of entries in the feature table array. |
20f77f56 | 80 | * @probe: the function to call when a device is found. Returns 0 or -errno. |
5f41f8bf | 81 | * @remove: the function to call when a device is removed. |
f957d1f0 RR |
82 | * @config_changed: optional function to call when the device configuration |
83 | * changes; may be called in interrupt context. | |
ec3d41c4 RR |
84 | */ |
85 | struct virtio_driver { | |
86 | struct device_driver driver; | |
87 | const struct virtio_device_id *id_table; | |
c45a6816 RR |
88 | const unsigned int *feature_table; |
89 | unsigned int feature_table_size; | |
ec3d41c4 RR |
90 | int (*probe)(struct virtio_device *dev); |
91 | void (*remove)(struct virtio_device *dev); | |
f957d1f0 | 92 | void (*config_changed)(struct virtio_device *dev); |
ec3d41c4 RR |
93 | }; |
94 | ||
95 | int register_virtio_driver(struct virtio_driver *drv); | |
96 | void unregister_virtio_driver(struct virtio_driver *drv); | |
97 | #endif /* _LINUX_VIRTIO_H */ |