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docs: driver-api: virtio: virtio on Linux

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Basic doc about Virtio on Linux and a short tutorial on Virtio drivers.

includes the following fixup:

virtio: fix virtio_config_ops kerneldocs

Fixes two warning messages when building htmldocs:

    warning: duplicate section name 'Note'
    warning: expecting prototype for virtio_config_ops().
             Prototype was for vq_callback_t() instead

Message-Id: <20221010064359.1324353-2-ricardo.canuelo@collabora.com>
Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20221220100035.2712449-1-ricardo.canuelo@collabora.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ricardo Cañuelo
2022-10-10 08:43:59 +02:00
committed by Michael S. Tsirkin
parent d5ff73bbb0
commit d16c0cd273
6 changed files with 359 additions and 3 deletions
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8
include/linux/virtio_config.h
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@@ -16,8 +16,10 @@ struct virtio_shm_region {
u64 len;
};
typedef void vq_callback_t(struct virtqueue *);
/**
* virtio_config_ops - operations for configuring a virtio device
* struct virtio_config_ops - operations for configuring a virtio device
* Note: Do not assume that a transport implements all of the operations
* getting/setting a value as a simple read/write! Generally speaking,
* any of @get/@set, @get_status/@set_status, or @get_features/
@@ -69,7 +71,8 @@ struct virtio_shm_region {
* vdev: the virtio_device
* This sends the driver feature bits to the device: it can change
* the dev->feature bits if it wants.
* Note: despite the name this can be called any number of times.
* Note that despite the name this can be called any number of
* times.
* Returns 0 on success or error status
* @bus_name: return the bus name associated with the device (optional)
* vdev: the virtio_device
@@ -91,7 +94,6 @@ struct virtio_shm_region {
* If disable_vq_and_reset is set, then enable_vq_after_reset must also be
* set.
*/
typedef void vq_callback_t(struct virtqueue *);
struct virtio_config_ops {
void (*get)(struct virtio_device *vdev, unsigned offset,
void *buf, unsigned len);