Merge tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Tanish Desai and Paolo Bonzini's tracing Rust support.

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# gpg: Signature made Wed 01 Oct 2025 08:30:42 AM PDT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [unknown]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [unknown]
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# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu:
  tracetool/syslog: add Rust support
  tracetool/ftrace: add Rust support
  tracetool/log: add Rust support
  log: change qemu_loglevel to unsigned
  tracetool/simple: add Rust support
  rust: pl011: add tracepoints
  rust: qdev: add minimal clock bindings
  rust: add trace crate
  tracetool: Add Rust format support
  tracetool/backend: remove redundant trace event checks
  tracetool: add CHECK_TRACE_EVENT_GET_STATE
  trace/ftrace: move snprintf+write from tracepoints to ftrace.c
  tracetool: add SPDX headers
  treewide: remove unnessary "coding" header
  tracetool: remove dead code
  tracetool: fix usage of try_import()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

10 files changed, 83 insertions, 23 deletions

diff --git a/scripts/tracetool/format/__init__.py b/scripts/tracetool/format/__init__.py
index 2dc46f3dd9..7b9d1b5782 100644
--- a/scripts/tracetool/format/__init__.py
+++ b/scripts/tracetool/format/__init__.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 Format management.
@@ -70,7 +70,7 @@ def exists(name):
     if len(name) == 0:
         return False
     name = name.replace("-", "_")
-    return tracetool.try_import("tracetool.format." + name)[1]
+    return tracetool.try_import("tracetool.format." + name)[0]
 
 
 def generate(events, format, backend, group):
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index e473fb6c6e..50e03313cb 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 trace/generated-tracers.c
diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py
index a5e096e214..e9e33dfe30 100644
--- a/scripts/tracetool/format/d.py
+++ b/scripts/tracetool/format/d.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 trace/generated-tracers.dtrace (DTrace only).
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index b42a8268a8..dd58713a15 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 trace/generated-tracers.h
@@ -40,11 +40,6 @@ def generate(events, backend, group):
             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)
@@ -60,7 +55,6 @@ def generate(events, backend, group):
 
         out('    false)')
 
-        # tracer without checks
         out('',
             'static inline void %(api)s(%(args)s)',
             '{',
@@ -68,11 +62,17 @@ def generate(events, backend, group):
             args=e.args)
 
         if "disable" not in e.properties:
-            backend.generate(e, group)
-
+            backend.generate(e, group, check_trace_event_get_state=False)
+
+            if backend.check_trace_event_get_state:
+                event_id = 'TRACE_' + e.name.upper()
+                cond = "trace_event_get_state(%s)" % event_id
+                out('    if (%(cond)s) {',
+                        cond=cond)
+                backend.generate(e, group, check_trace_event_get_state=True)
+                out('    }')
         out('}')
 
-
     backend.generate_end(events, group)
 
     out('#endif /* TRACE_%s_GENERATED_TRACERS_H */' % group.upper())
diff --git a/scripts/tracetool/format/log_stap.py b/scripts/tracetool/format/log_stap.py
index 710d62bffe..259303a189 100644
--- a/scripts/tracetool/format/log_stap.py
+++ b/scripts/tracetool/format/log_stap.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 Generate .stp file that printfs log messages (DTrace with SystemTAP only).
@@ -18,8 +18,6 @@ from tracetool.backend.dtrace import binary, probeprefix
 from tracetool.backend.simple import is_string
 from tracetool.format.stap import stap_escape
 
-def global_var_name(name):
-    return probeprefix().replace(".", "_") + "_" + name
 
 STATE_SKIP = 0
 STATE_LITERAL = 1
diff --git a/scripts/tracetool/format/rs.py b/scripts/tracetool/format/rs.py
new file mode 100644
index 0000000000..32ac4e5977
--- /dev/null
+++ b/scripts/tracetool/format/rs.py
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+"""
+trace-DIR.rs
+"""
+
+__author__     = "Tanish Desai <tanishdesai37@gmail.com>"
+__copyright__  = "Copyright 2025, Tanish Desai <tanishdesai37@gmail.com>"
+__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):
+    out('// SPDX-License-Identifier: GPL-2.0-or-later',
+        '// This file is @generated by tracetool, do not edit.',
+        '',
+        '#[allow(unused_imports)]',
+        'use std::ffi::c_char;',
+        '#[allow(unused_imports)]',
+        'use util::bindings;',
+        '',
+        '#[inline(always)]',
+        'fn trace_event_state_is_enabled(dstate: u16) -> bool {',
+        '    (unsafe { trace_events_enabled_count }) != 0 && dstate != 0',
+        '}',
+        '',
+        'extern "C" {',
+        '    static mut trace_events_enabled_count: u32;',
+        '}',)
+
+    out('extern "C" {')
+
+    for e in events:
+        out('    static mut %s: u16;' % e.api(e.QEMU_DSTATE))
+    out('}')
+
+    backend.generate_begin(events, group)
+
+    for e in events:
+        out('',
+            '#[inline(always)]',
+            '#[allow(dead_code)]',
+            'pub fn %(api)s(%(args)s)',
+            '{',
+            api=e.api(e.QEMU_TRACE),
+            args=e.args.rust_decl())
+
+        if "disable" not in e.properties:
+            backend.generate(e, group, check_trace_event_get_state=False)
+            if backend.check_trace_event_get_state:
+                event_id = 'TRACE_' + e.name.upper()
+                out('    if trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) {',
+                    event_id = event_id,
+                    api=e.api())
+                backend.generate(e, group, check_trace_event_get_state=True)
+                out('    }')
+        out('}')
+
+    backend.generate_end(events, group)
diff --git a/scripts/tracetool/format/simpletrace_stap.py b/scripts/tracetool/format/simpletrace_stap.py
index 72971133bf..c7bde97a85 100644
--- a/scripts/tracetool/format/simpletrace_stap.py
+++ b/scripts/tracetool/format/simpletrace_stap.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 Generate .stp file that outputs simpletrace binary traces (DTrace with SystemTAP only).
@@ -17,8 +17,6 @@ from tracetool.backend.dtrace import probeprefix
 from tracetool.backend.simple import is_string
 from tracetool.format.stap import stap_escape
 
-def global_var_name(name):
-    return probeprefix().replace(".", "_") + "_" + name
 
 def generate(events, backend, group):
     out('/* This file is autogenerated by tracetool, do not edit. */',
diff --git a/scripts/tracetool/format/stap.py b/scripts/tracetool/format/stap.py
index 4d77fbc11a..285c9203ba 100644
--- a/scripts/tracetool/format/stap.py
+++ b/scripts/tracetool/format/stap.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 Generate .stp file (DTrace with SystemTAP only).
diff --git a/scripts/tracetool/format/ust_events_c.py b/scripts/tracetool/format/ust_events_c.py
index 569754a304..074226bfd3 100644
--- a/scripts/tracetool/format/ust_events_c.py
+++ b/scripts/tracetool/format/ust_events_c.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 trace/generated-ust.c
diff --git a/scripts/tracetool/format/ust_events_h.py b/scripts/tracetool/format/ust_events_h.py
index 2a31fefeca..cee7970a40 100644
--- a/scripts/tracetool/format/ust_events_h.py
+++ b/scripts/tracetool/format/ust_events_h.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 """
 trace/generated-ust-provider.h