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virtio-bus: remove vdev field

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The vdev field is complicated to synchronize.  Just access the
BusState's list of children.

Cc: qemu-stable@nongnu.org
Acked-by: Andreas Faerber <afaerber@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-09-20 13:31:39 +02:00
parent 0b81c1ef5c
commit 06d3dff072
4 changed files with 57 additions and 35 deletions
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65
hw/virtio/virtio-bus.c
View File

@ -46,8 +46,6 @@ int virtio_bus_plug_device(VirtIODevice *vdev)
VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
DPRINTF("%s: plug device.\n", qbus->name);
bus->vdev = vdev;
if (klass->device_plugged != NULL) {
klass->device_plugged(qbus->parent);
}
@ -58,9 +56,11 @@ int virtio_bus_plug_device(VirtIODevice *vdev)
/* Reset the virtio_bus */
void virtio_bus_reset(VirtioBusState *bus)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
DPRINTF("%s: reset device.\n", qbus->name);
if (bus->vdev != NULL) {
virtio_reset(bus->vdev);
if (vdev != NULL) {
virtio_reset(vdev);
}
}
@ -69,62 +69,71 @@ void virtio_bus_destroy_device(VirtioBusState *bus)
{
BusState *qbus = BUS(bus);
VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
VirtIODevice *vdev = virtio_bus_get_device(bus);
DPRINTF("%s: remove device.\n", qbus->name);
if (bus->vdev != NULL) {
if (vdev != NULL) {
if (klass->device_unplug != NULL) {
klass->device_unplug(qbus->parent);
}
object_unparent(OBJECT(bus->vdev));
bus->vdev = NULL;
object_unparent(OBJECT(vdev));
}
}
/* Get the device id of the plugged device. */
uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
{
assert(bus->vdev != NULL);
return bus->vdev->device_id;
VirtIODevice *vdev = virtio_bus_get_device(bus);
assert(vdev != NULL);
return vdev->device_id;
}
/* Get the config_len field of the plugged device. */
size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
{
assert(bus->vdev != NULL);
return bus->vdev->config_len;
VirtIODevice *vdev = virtio_bus_get_device(bus);
assert(vdev != NULL);
return vdev->config_len;
}
/* Get the features of the plugged device. */
uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
uint32_t requested_features)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
VirtioDeviceClass *k;
assert(bus->vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
assert(vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(vdev);
assert(k->get_features != NULL);
return k->get_features(bus->vdev, requested_features);
return k->get_features(vdev, requested_features);
}
/* Set the features of the plugged device. */
void virtio_bus_set_vdev_features(VirtioBusState *bus,
uint32_t requested_features)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
VirtioDeviceClass *k;
assert(bus->vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
assert(vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(vdev);
if (k->set_features != NULL) {
k->set_features(bus->vdev, requested_features);
k->set_features(vdev, requested_features);
}
}
/* Get bad features of the plugged device. */
uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
VirtioDeviceClass *k;
assert(bus->vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
assert(vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(vdev);
if (k->bad_features != NULL) {
return k->bad_features(bus->vdev);
return k->bad_features(vdev);
} else {
return 0;
}
@ -133,22 +142,26 @@ uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
/* Get config of the plugged device. */
void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
VirtioDeviceClass *k;
assert(bus->vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
assert(vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(vdev);
if (k->get_config != NULL) {
k->get_config(bus->vdev, config);
k->get_config(vdev, config);
}
}
/* Set config of the plugged device. */
void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
VirtioDeviceClass *k;
assert(bus->vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
assert(vdev != NULL);
k = VIRTIO_DEVICE_GET_CLASS(vdev);
if (k->set_config != NULL) {
k->set_config(bus->vdev, config);
k->set_config(vdev, config);
}
}

9
hw/virtio/virtio-mmio.c
View File

@ -95,7 +95,7 @@ static void virtio_mmio_bus_new(VirtioBusState *bus, size_t bus_size,
static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size)
{
VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
VirtIODevice *vdev = proxy->bus.vdev;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
DPRINTF("virtio_mmio_read offset 0x%x\n", (int)offset);
@ -185,7 +185,7 @@ static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
VirtIODevice *vdev = proxy->bus.vdev;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
DPRINTF("virtio_mmio_write offset 0x%x value 0x%" PRIx64 "\n",
(int)offset, value);
@ -298,12 +298,13 @@ static const MemoryRegionOps virtio_mem_ops = {
static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
int level;
if (!proxy->bus.vdev) {
if (!vdev) {
return;
}
level = (proxy->bus.vdev->isr != 0);
level = (vdev->isr != 0);
DPRINTF("virtio_mmio setting IRQ %d\n", level);
qemu_set_irq(proxy->irq, level);
}

2
hw/virtio/virtio-pci.c
View File

@ -943,7 +943,7 @@ static void virtio_pci_device_plugged(DeviceState *d)
uint8_t *config;
uint32_t size;
proxy->vdev = bus->vdev;
proxy->vdev = virtio_bus_get_device(bus);
config = proxy->pci_dev.config;
if (proxy->class_code) {

16
include/hw/virtio/virtio-bus.h
View File

@ -72,10 +72,6 @@ typedef struct VirtioBusClass {
struct VirtioBusState {
BusState parent_obj;
/*
* Only one VirtIODevice can be plugged on the bus.
*/
VirtIODevice *vdev;
};
int virtio_bus_plug_device(VirtIODevice *vdev);
@ -98,4 +94,16 @@ void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config);
/* Set config of the plugged device. */
void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config);
static inline VirtIODevice *virtio_bus_get_device(VirtioBusState *bus)
{
BusState *qbus = &bus->parent_obj;
BusChild *kid = QTAILQ_FIRST(&qbus->children);
DeviceState *qdev = kid ? kid->child : NULL;
/* This is used on the data path, the cast is guaranteed
* to succeed by the qdev machinery.
*/
return (VirtIODevice *)qdev;
}
#endif /* VIRTIO_BUS_H */