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trace: add virtio_set_status() trace event 

The virtio device lifecycle can be observed by looking at the sequence
of set status operations.  This is especially important for catching the
reset operation (status value 0), which resets the device and all
virtqueues.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Stefan Hajnoczi 2011-09-13 13:34:37 +01:00 committed by Blue Swirl
parent 689d7e2fad
commit 4e1837f855
3 changed files with 12 additions and 8 deletions
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10
hw/virtio.c
View File

@ -498,6 +498,16 @@ void virtio_update_irq(VirtIODevice *vdev)
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
}
void virtio_set_status(VirtIODevice *vdev, uint8_t val)
{
trace_virtio_set_status(vdev, val);
if (vdev->set_status) {
vdev->set_status(vdev, val);
}
vdev->status = val;
}
void virtio_reset(void *opaque)
{
VirtIODevice *vdev = opaque;

9
hw/virtio.h
View File

@ -135,14 +135,6 @@ struct VirtIODevice
VMChangeStateEntry *vmstate;
};
static inline void virtio_set_status(VirtIODevice *vdev, uint8_t val)
{
if (vdev->set_status) {
vdev->set_status(vdev, val);
}
vdev->status = val;
}
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
void (*handle_output)(VirtIODevice *,
VirtQueue *));
@ -190,6 +182,7 @@ int virtio_queue_get_num(VirtIODevice *vdev, int n);
void virtio_queue_notify(VirtIODevice *vdev, int n);
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
void virtio_set_status(VirtIODevice *vdev, uint8_t val);
void virtio_reset(void *opaque);
void virtio_update_irq(VirtIODevice *vdev);

1
trace-events
View File

@ -42,6 +42,7 @@ virtqueue_pop(void *vq, void *elem, unsigned int in_num, unsigned int out_num) "
virtio_queue_notify(void *vdev, int n, void *vq) "vdev %p n %d vq %p"
virtio_irq(void *vq) "vq %p"
virtio_notify(void *vdev, void *vq) "vdev %p vq %p"
virtio_set_status(void *vdev, uint8_t val) "vdev %p val %u"
# hw/virtio-serial-bus.c
virtio_serial_send_control_event(unsigned int port, uint16_t event, uint16_t value) "port %u, event %u, value %u"