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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> |
10 | |
11 | /** |
12 | * virtqueue - a queue to register buffers for sending or receiving. |
13 | * @list: the chain of virtqueues for this device |
14 | * @callback: the function to call when buffers are consumed (can be NULL). |
15 | * @name: the name of this virtqueue (mainly for debugging) |
16 | * @vdev: the virtio device this queue was created for. |
17 | * @vq_ops: the operations for this virtqueue (see below). |
18 | * @priv: a pointer for the virtqueue implementation to use. |
19 | */ |
20 | struct virtqueue { |
21 | struct list_head list; |
22 | void (*callback)(struct virtqueue *vq); |
23 | const char *name; |
24 | struct virtio_device *vdev; |
25 | struct virtqueue_ops *vq_ops; |
26 | void *priv; |
27 | }; |
28 | |
29 | /** |
30 | * virtqueue_ops - operations for virtqueue abstraction layer |
31 | * @add_buf: expose buffer to other end |
32 | * vq: the struct virtqueue we're talking about. |
33 | * sg: the description of the buffer(s). |
34 | * out_num: the number of sg readable by other side |
35 | * in_num: the number of sg which are writable (after readable ones) |
36 | * data: the token identifying the buffer. |
37 | * Returns remaining capacity of queue (sg segments) or a negative error. |
38 | * @kick: update after add_buf |
39 | * vq: the struct virtqueue |
40 | * After one or more add_buf calls, invoke this to kick the other side. |
41 | * @get_buf: get the next used buffer |
42 | * vq: the struct virtqueue we're talking about. |
43 | * len: the length written into the buffer |
44 | * Returns NULL or the "data" token handed to add_buf. |
45 | * @disable_cb: disable callbacks |
46 | * vq: the struct virtqueue we're talking about. |
47 | * Note that this is not necessarily synchronous, hence unreliable and only |
48 | * useful as an optimization. |
49 | * @enable_cb: restart callbacks after disable_cb. |
50 | * vq: the struct virtqueue we're talking about. |
51 | * This re-enables callbacks; it returns "false" if there are pending |
52 | * buffers in the queue, to detect a possible race between the driver |
53 | * checking for more work, and enabling callbacks. |
54 | * @detach_unused_buf: detach first unused buffer |
55 | * vq: the struct virtqueue we're talking about. |
56 | * Returns NULL or the "data" token handed to add_buf |
57 | * |
58 | * Locking rules are straightforward: the driver is responsible for |
59 | * locking. No two operations may be invoked simultaneously, with the exception |
60 | * of @disable_cb. |
61 | * |
62 | * All operations can be called in any context. |
63 | */ |
64 | struct virtqueue_ops { |
65 | int (*add_buf)(struct virtqueue *vq, |
66 | struct scatterlist sg[], |
67 | unsigned int out_num, |
68 | unsigned int in_num, |
69 | void *data); |
70 | |
71 | void (*kick)(struct virtqueue *vq); |
72 | |
73 | void *(*get_buf)(struct virtqueue *vq, unsigned int *len); |
74 | |
75 | void (*disable_cb)(struct virtqueue *vq); |
76 | bool (*enable_cb)(struct virtqueue *vq); |
77 | void *(*detach_unused_buf)(struct virtqueue *vq); |
78 | }; |
79 | |
80 | /** |
81 | * virtio_device - representation of a device using virtio |
82 | * @index: unique position on the virtio bus |
83 | * @dev: underlying device. |
84 | * @id: the device type identification (used to match it with a driver). |
85 | * @config: the configuration ops for this device. |
86 | * @vqs: the list of virtqueues for this device. |
87 | * @features: the features supported by both driver and device. |
88 | * @priv: private pointer for the driver's use. |
89 | */ |
90 | struct virtio_device { |
91 | int index; |
92 | struct device dev; |
93 | struct virtio_device_id id; |
94 | struct virtio_config_ops *config; |
95 | struct list_head vqs; |
96 | /* Note that this is a Linux set_bit-style bitmap. */ |
97 | unsigned long features[1]; |
98 | void *priv; |
99 | }; |
100 | |
101 | #define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev) |
102 | int register_virtio_device(struct virtio_device *dev); |
103 | void unregister_virtio_device(struct virtio_device *dev); |
104 | |
105 | /** |
106 | * virtio_driver - operations for a virtio I/O driver |
107 | * @driver: underlying device driver (populate name and owner). |
108 | * @id_table: the ids serviced by this driver. |
109 | * @feature_table: an array of feature numbers supported by this device. |
110 | * @feature_table_size: number of entries in the feature table array. |
111 | * @probe: the function to call when a device is found. Returns 0 or -errno. |
112 | * @remove: the function when a device is removed. |
113 | * @config_changed: optional function to call when the device configuration |
114 | * changes; may be called in interrupt context. |
115 | */ |
116 | struct virtio_driver { |
117 | struct device_driver driver; |
118 | const struct virtio_device_id *id_table; |
119 | const unsigned int *feature_table; |
120 | unsigned int feature_table_size; |
121 | int (*probe)(struct virtio_device *dev); |
122 | void (*remove)(struct virtio_device *dev); |
123 | void (*config_changed)(struct virtio_device *dev); |
124 | }; |
125 | |
126 | int register_virtio_driver(struct virtio_driver *drv); |
127 | void unregister_virtio_driver(struct virtio_driver *drv); |
128 | #endif /* _LINUX_VIRTIO_H */ |
129 |
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