Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

Tracing pull request

* remotes/stefanha/tags/tracing-pull-request:
  virtio-rng: add some trace events
  trace: add some tcg tracing support
  trace: teach lttng backend to use format strings
  trace: [tcg] Include TCG-tracing header on all targets
  trace: [tcg] Include event definitions in "trace.h"
  trace: [tcg] Generate TCG tracing routines
  trace: [tcg] Include TCG-tracing helpers
  trace: [tcg] Define TCG tracing helper routine wrappers
  trace: [tcg] Define TCG tracing helper routines
  trace: [tcg] Declare TCG tracing helper routines
  trace: [tcg] Add 'tcg' event property
  trace: [tcg] Argument type transformation machinery
  trace: [tcg] Argument type transformation rules
  trace: [tcg] Add documentation
  trace: install simpletrace SystemTap tapset
  simpletrace: add simpletrace.py --no-header option
  trace: add tracetool simpletrace_stap format
  trace: extract stap_escape() function for reuse

Conflicts:
	Makefile.objs

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index 03fd04a..e85a979 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;
 }
 
@@ -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);