From 06d3dff0723c712a4b109ced4243edf49ef850af Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 20 Sep 2013 13:31:39 +0200 Subject: [PATCH] virtio-bus: remove vdev field The vdev field is complicated to synchronize. Just access the BusState's list of children. Cc: qemu-stable@nongnu.org Acked-by: Andreas Faerber Signed-off-by: Paolo Bonzini --- hw/virtio/virtio-bus.c | 65 ++++++++++++++++++++-------------- hw/virtio/virtio-mmio.c | 9 ++--- hw/virtio/virtio-pci.c | 2 +- include/hw/virtio/virtio-bus.h | 16 ++++++--- 4 files changed, 57 insertions(+), 35 deletions(-) diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c index e6b103c991..17dd06e1a1 100644 --- a/hw/virtio/virtio-bus.c +++ b/hw/virtio/virtio-bus.c @@ -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); } } diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c index 29cf284d12..8829eb0e26 100644 --- a/hw/virtio/virtio-mmio.c +++ b/hw/virtio/virtio-mmio.c @@ -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); } diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 7647be8a3c..76b765211b 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -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) { diff --git a/include/hw/virtio/virtio-bus.h b/include/hw/virtio/virtio-bus.h index 9217f85abc..ba0f86abf1 100644 --- a/include/hw/virtio/virtio-bus.h +++ b/include/hw/virtio/virtio-bus.h @@ -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 */