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virtio-rng: add some trace events

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Add some trace events to virtio-rng for easier debugging

Signed-off-by: Amit Shah <amit.shah@redhat.com>

Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Amit Shah 2014-08-04 16:22:44 +05:30 committed by Stefan Hajnoczi
parent 6db8b53866
commit 4ac4458076
2 changed files with 11 additions and 0 deletions
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6
hw/virtio/virtio-rng.c
View File

@ -16,6 +16,7 @@
#include "hw/virtio/virtio-rng.h"
#include "sysemu/rng.h"
#include "qom/object_interfaces.h"
#include "trace.h"
static bool is_guest_ready(VirtIORNG *vrng)
{
@ -24,6 +25,7 @@ static bool is_guest_ready(VirtIORNG *vrng)
&& (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return true;
}
trace_virtio_rng_guest_not_ready(vrng);
return false;
}
@ -62,6 +64,7 @@ static void chr_read(void *opaque, const void *buf, size_t size)
offset += len;
virtqueue_push(vrng->vq, &elem, len);
trace_virtio_rng_pushed(vrng, len);
}
virtio_notify(vdev, vrng->vq);
}
@ -81,6 +84,9 @@ static void virtio_rng_process(VirtIORNG *vrng)
quota = MIN((uint64_t)vrng->quota_remaining, (uint64_t)UINT32_MAX);
}
size = get_request_size(vrng->vq, quota);
trace_virtio_rng_request(vrng, size, quota);
size = MIN(vrng->quota_remaining, size);
if (size) {
rng_backend_request_entropy(vrng->rng, size, chr_read, vrng);

5
trace-events
View File

@ -41,6 +41,11 @@ 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/virtio-rng.c
virtio_rng_guest_not_ready(void *rng) "rng %p: guest not ready"
virtio_rng_pushed(void *rng, size_t len) "rng %p: %zd bytes pushed"
virtio_rng_request(void *rng, size_t size, unsigned quota) "rng %p: %zd bytes requested, %u bytes quota left"
# hw/char/virtio-serial-bus.c
virtio_serial_send_control_event(unsigned int port, uint16_t event, uint16_t value) "port %u, event %u, value %u"
virtio_serial_throttle_port(unsigned int port, bool throttle) "port %u, throttle %d"