[Qemu-devel] [PATCH 1/1] virtio-rng: add some trace events

[Amit Shah]

Add some trace events to virtio-rng for easier debugging

Signed-off-by: Amit Shah <amit.s...@redhat.com>
---
 hw/virtio/virtio-rng.c | 5 +++++
 trace-events           | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index 1356aca..84d4651 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -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;
 }
 
@@ -61,6 +63,7 @@ static void chr_read(void *opaque, const void *buf, size_t 
size)
                            0, buf + offset, size - offset);
         offset += len;
 
+        trace_virtio_rng_bytes_pushed(vrng, len);
         virtqueue_push(vrng->vq, &elem, len);
     }
     virtio_notify(vdev, vrng->vq);
@@ -82,6 +85,8 @@ static void virtio_rng_process(VirtIORNG *vrng)
     }
     size = get_request_size(vrng->vq, quota);
     size = MIN(vrng->quota_remaining, size);
+
+    trace_virtio_rng_requested_size(vrng, size, quota);
     if (size) {
         rng_backend_request_entropy(vrng->rng, size, chr_read, vrng);
     }
diff --git a/trace-events b/trace-events
index 11a17a8..d4e7a8e 100644
--- a/trace-events
+++ b/trace-events
@@ -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_bytes_pushed(void *rng, size_t len) "rng %p: %zd bytes pushed"
+virtio_rng_requested_size(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"
-- 
1.9.3