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trace: add virtio_set_status() trace event

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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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trace-events
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@ -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"