perf python: Add syscall name/id to convert syscall number and name

Use perf's syscalltbl support to convert syscall number to name
assuming the number is for the host machine. This avoids python
libaudit support as tools/perf/scripts/python/syscall-counts.py
requires.

Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alice Rogers <alice.mei.rogers@gmail.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 05691a513184..c5f567c15cc7 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -21,6 +21,7 @@
 #include "data.h"
 #include "debug.h"
 #include "dso.h"
+#include "dwarf-regs.h"
 #include "event.h"
 #include "branch.h"
 #include "evlist.h"
@@ -40,6 +41,7 @@
 #include "symbol.h"
 #include "stat.h"
 #include "header.h"
+#include "trace/beauty/syscalltbl.h"
 #include "thread.h"
 #include "thread_map.h"
 #include "tool.h"
@@ -3957,6 +3959,40 @@ static int pyrf_session__setup_types(void)
 	return PyType_Ready(&pyrf_session__type);
 }
 
+static PyObject *pyrf__syscall_name(PyObject *self, PyObject *args, PyObject *kwargs)
+{
+	const char *name;
+	int id;
+	int elf_machine = EM_HOST;
+	static char *kwlist[] = { "id", "elf_machine", NULL };
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "i|$i", kwlist, &id, &elf_machine))
+		return NULL;
+
+	name = syscalltbl__name(elf_machine, id);
+	if (!name)
+		Py_RETURN_NONE;
+	return PyUnicode_FromString(name);
+}
+
+static PyObject *pyrf__syscall_id(PyObject *self, PyObject *args, PyObject *kwargs)
+{
+	const char *name;
+	int id;
+	int elf_machine = EM_HOST;
+	static char *kwlist[] = { "name", "elf_machine", NULL };
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|$i", kwlist, &name, &elf_machine))
+		return NULL;
+
+	id = syscalltbl__id(elf_machine, name);
+	if (id < 0) {
+		PyErr_Format(PyExc_ValueError, "Failed to find syscall %s", name);
+		return NULL;
+	}
+	return PyLong_FromLong(id);
+}
+
 static PyMethodDef perf__methods[] = {
 	{
 		.ml_name  = "metrics",
@@ -3990,6 +4026,18 @@ static PyMethodDef perf__methods[] = {
 		.ml_flags = METH_NOARGS,
 		.ml_doc	  = PyDoc_STR("Returns a sequence of pmus.")
 	},
+	{
+		.ml_name  = "syscall_name",
+		.ml_meth  = (PyCFunction) pyrf__syscall_name,
+		.ml_flags = METH_VARARGS | METH_KEYWORDS,
+		.ml_doc	  = PyDoc_STR("Turns a syscall number to a string.")
+	},
+	{
+		.ml_name  = "syscall_id",
+		.ml_meth  = (PyCFunction) pyrf__syscall_id,
+		.ml_flags = METH_VARARGS | METH_KEYWORDS,
+		.ml_doc	  = PyDoc_STR("Turns a syscall name to a number.")
+	},
 	{ .ml_name = NULL, }
 };