Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 103 insertions, 0 deletions

diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
new file mode 100644
index 000000000..e94f0be7d
--- /dev/null
+++ b/scripts/tracetool/format/h.py
@@ -0,0 +1,103 @@
+# -*- coding: utf-8 -*-
+
+"""
+trace/generated-tracers.h
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@redhat.com"
+
+
+from tracetool import out
+
+
+def generate(events, backend, group):
+    if group == "root":
+        header = "trace/control-vcpu.h"
+    else:
+        header = "trace/control.h"
+
+    out('/* This file is autogenerated by tracetool, do not edit. */',
+        '',
+        '#ifndef TRACE_%s_GENERATED_TRACERS_H' % group.upper(),
+        '#define TRACE_%s_GENERATED_TRACERS_H' % group.upper(),
+        '',
+        '#include "%s"' % header,
+        '')
+
+    for e in events:
+        out('extern TraceEvent %(event)s;',
+            event = e.api(e.QEMU_EVENT))
+
+    for e in events:
+        out('extern uint16_t %s;' % e.api(e.QEMU_DSTATE))
+
+    # static state
+    for e in events:
+        if 'disable' in e.properties:
+            enabled = 0
+        else:
+            enabled = 1
+        if "tcg-exec" in e.properties:
+            # a single define for the two "sub-events"
+            out('#define TRACE_%(name)s_ENABLED %(enabled)d',
+                name=e.original.name.upper(),
+                enabled=enabled)
+        out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
+
+    backend.generate_begin(events, group)
+
+    for e in events:
+        # tracer-specific dstate
+        out('',
+            '#define %(api)s() ( \\',
+            api=e.api(e.QEMU_BACKEND_DSTATE))
+
+        if "disable" not in e.properties:
+            backend.generate_backend_dstate(e, group)
+
+        out('    false)')
+
+        # tracer without checks
+        out('',
+            'static inline void %(api)s(%(args)s)',
+            '{',
+            api=e.api(e.QEMU_TRACE_NOCHECK),
+            args=e.args)
+
+        if "disable" not in e.properties:
+            backend.generate(e, group)
+
+        out('}')
+
+        # tracer wrapper with checks (per-vCPU tracing)
+        if "vcpu" in e.properties:
+            trace_cpu = next(iter(e.args))[1]
+            cond = "trace_event_get_vcpu_state(%(cpu)s,"\
+                   " TRACE_%(id)s)"\
+                   % dict(
+                       cpu=trace_cpu,
+                       id=e.name.upper())
+        else:
+            cond = "true"
+
+        out('',
+            'static inline void %(api)s(%(args)s)',
+            '{',
+            '    if (%(cond)s) {',
+            '        %(api_nocheck)s(%(names)s);',
+            '    }',
+            '}',
+            api=e.api(),
+            api_nocheck=e.api(e.QEMU_TRACE_NOCHECK),
+            args=e.args,
+            names=", ".join(e.args.names()),
+            cond=cond)
+
+    backend.generate_end(events, group)
+
+    out('#endif /* TRACE_%s_GENERATED_TRACERS_H */' % group.upper())