| 1 | #ifndef _LINUX_VIRTIO_H
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| 2 | #define _LINUX_VIRTIO_H
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| 3 | |
| 4 | * implementation.
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| 5 | #include <linux/types.h>
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| 6 | #include <linux/scatterlist.h>
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| 7 | #include <linux/spinlock.h>
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| 8 | #include <linux/device.h>
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| 9 | #include <linux/mod_devicetable.h>
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| 10 | #include <linux/gfp.h>
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| 11 |
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| 12 | |
| 13 | * virtqueue - a queue to register buffers for sending or receiving.
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| 14 | * @list: the chain of virtqueues for this device
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| 15 | * @callback: the function to call when buffers are consumed (can be NULL).
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| 16 | * @name: the name of this virtqueue (mainly for debugging)
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| 17 | * @vdev: the virtio device this queue was created for.
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| 18 | * @priv: a pointer for the virtqueue implementation to use.
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| 19 |
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| 20 | struct virtqueue {
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| 21 | struct list_head list;
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| 22 | void (*callback)(struct virtqueue *vq);
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| 23 | const char *name;
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| 24 | struct virtio_device *vdev;
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| 25 | void *priv;
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| 26 | };
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| 27 |
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| 28 | int virtqueue_add_buf(struct virtqueue *vq,
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| 29 | struct scatterlist sg[],
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| 30 | unsigned int out_num,
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| 31 | unsigned int in_num,
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| 32 | void *data,
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| 33 | gfp_t gfp);
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| 34 |
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| 35 | void virtqueue_kick(struct virtqueue *vq);
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| 36 |
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| 37 | bool virtqueue_kick_prepare(struct virtqueue *vq);
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| 38 |
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| 39 | void virtqueue_notify(struct virtqueue *vq);
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| 40 |
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| 41 | void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
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| 42 |
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| 43 | void virtqueue_disable_cb(struct virtqueue *vq);
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| 44 |
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| 45 | bool virtqueue_enable_cb(struct virtqueue *vq);
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| 46 |
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| 47 | bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
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| 48 |
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| 49 | void *virtqueue_detach_unused_buf(struct virtqueue *vq);
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| 50 |
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| 51 | unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
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| 52 |
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| 53 | |
| 54 | * virtio_device - representation of a device using virtio
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| 55 | * @index: unique position on the virtio bus
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| 56 | * @dev: underlying device.
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| 57 | * @id: the device type identification (used to match it with a driver).
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| 58 | * @config: the configuration ops for this device.
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| 59 | * @vqs: the list of virtqueues for this device.
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| 60 | * @features: the features supported by both driver and device.
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| 61 | * @priv: private pointer for the driver's use.
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| 62 |
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| 63 | struct virtio_device {
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| 64 | int index;
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| 65 | struct device dev;
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| 66 | struct virtio_device_id id;
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| 67 | struct virtio_config_ops *config;
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| 68 | struct list_head vqs;
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| 69 |
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| 70 | unsigned long features[1];
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| 71 | void *priv;
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| 72 | };
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| 73 |
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| 74 | #define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
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| 75 | int register_virtio_device(struct virtio_device *dev);
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| 76 | void unregister_virtio_device(struct virtio_device *dev);
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| 77 |
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| 78 | |
| 79 | * virtio_driver - operations for a virtio I/O driver
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| 80 | * @driver: underlying device driver (populate name and owner).
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| 81 | * @id_table: the ids serviced by this driver.
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| 82 | * @feature_table: an array of feature numbers supported by this driver.
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| 83 | * @feature_table_size: number of entries in the feature table array.
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| 84 | * @probe: the function to call when a device is found. Returns 0 or -errno.
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| 85 | * @remove: the function to call when a device is removed.
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| 86 | * @config_changed: optional function to call when the device configuration
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| 87 | * changes; may be called in interrupt context.
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| 88 |
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| 89 | struct virtio_driver {
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| 90 | struct device_driver driver;
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| 91 | const struct virtio_device_id *id_table;
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| 92 | const unsigned int *feature_table;
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| 93 | unsigned int feature_table_size;
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| 94 | int (*probe)(struct virtio_device *dev);
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| 95 | void (*remove)(struct virtio_device *dev);
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| 96 | void (*config_changed)(struct virtio_device *dev);
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| 97 | #ifdef CONFIG_PM
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| 98 | int (*freeze)(struct virtio_device *dev);
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| 99 | int (*restore)(struct virtio_device *dev);
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| 100 | #endif
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| 101 | };
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| 102 |
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| 103 | int register_virtio_driver(struct virtio_driver *drv);
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| 104 | void unregister_virtio_driver(struct virtio_driver *drv);
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| 105 | #endif
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