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Add VirtIO bus config_generation method

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VirtIO buses (PCI, MMIO) can provide a generation field so a driver
can ensure either a 64-bit or array read was stable.

MFC after:	2 weeks
This commit is contained in:
bryanv 2018-02-19 19:28:24 +00:00
parent 9cca77fa4f
commit 263105576c
3 changed files with 20 additions and 0 deletions
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7
sys/dev/virtio/virtio.c
View File

@ -240,6 +240,13 @@ virtio_reinit_complete(device_t dev)
VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev));
}
int
virtio_config_generation(device_t dev)
{
return (VIRTIO_BUS_CONFIG_GENERATION(device_get_parent(dev)));
}
void
virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len)
{

1
sys/dev/virtio/virtio.h
View File

@ -78,6 +78,7 @@ int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
int virtio_setup_intr(device_t dev, enum intr_type type);
int virtio_with_feature(device_t dev, uint64_t feature);
void virtio_stop(device_t dev);
int virtio_config_generation(device_t dev);
int virtio_reinit(device_t dev, uint64_t features);
void virtio_reinit_complete(device_t dev);

12
sys/dev/virtio/virtio_bus_if.m
View File

@ -34,6 +34,14 @@ HEADER {
struct vq_alloc_info;
};
CODE {
static int
virtio_bus_default_config_generation(device_t dev)
{
return (0);
}
};
METHOD uint64_t negotiate_features {
device_t dev;
uint64_t child_features;
@ -74,6 +82,10 @@ METHOD void notify_vq {
uint16_t queue;
};
METHOD int config_generation {
device_t dev;
} DEFAULT virtio_bus_default_config_generation;
METHOD void read_device_config {
device_t dev;
bus_size_t offset;