verification/rvgen: Restructure the templates files

To simply the scripts and to allow easy integration of new monitor types,
restructure the template files as followed:

1. Move the template files to be in the same directory as the rvgen
   package. Furthermore, the installation will now only install the
   templates to the package directory, not /usr/share/. This simplify
   templates reading, as the scripts do not need to find the templates at
   multiple places.

2. Move dot2k_templates/* to:
     - templates/dot2k/
     - templates/container/

   This allows sharing templates reading code between DA monitor generation
   and container generation (and any future generation type).

   For template files which can be shared between different generation
   types, support putting them in templates/

This restructure aligns with the recommendation from:
https://python-packaging.readthedocs.io/en/latest/non-code-files.html

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/462d90273f96804d3ba850474877d5f727031258.1751634289.git.namcao@linutronix.de
Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

tools/verification/rvgen/Makefile

@@ -3,7 +3,6 @@ INSTALL=install
 prefix  ?= /usr
 bindir  ?= $(prefix)/bin
 mandir  ?= $(prefix)/share/man
-miscdir ?= $(prefix)/share/rvgen
 srcdir  ?= $(prefix)/src
 
 PYLIB  ?= $(shell python3 -c 'import sysconfig;  print (sysconfig.get_path("purelib"))')
@@ -21,6 +20,4 @@ install:
 	$(INSTALL) dot2c -D -m 755 $(DESTDIR)$(bindir)/
 	$(INSTALL) rvgen/dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2k.py
 	$(INSTALL) __main__.py -D -m 755 $(DESTDIR)$(bindir)/rvgen
-
-	mkdir -p ${miscdir}/
-	cp -rp dot2k_templates $(DESTDIR)$(miscdir)/
+	cp -rp rvgen/templates $(DESTDIR)$(PYLIB)/rvgen/

tools/verification/rvgen/rvgen/dot2k.py

@@ -14,14 +14,16 @@ import os
 
 class dot2k(Dot2c):
     monitor_types = { "global" : 1, "per_cpu" : 2, "per_task" : 3 }
-    monitor_templates_dir = "rvgen/dot2k_templates/"
     rv_dir = "kernel/trace/rv"
     monitor_type = "per_cpu"
 
     def __init__(self, file_path, MonitorType, extra_params={}):
         self.container = extra_params.get("subcmd") == "container"
         self.parent = extra_params.get("parent")
-        self.__fill_rv_templates_dir()
+        if self.container:
+            self.abs_template_dir = os.path.join(os.path.dirname(__file__), "templates/container")
+        else:
+            self.abs_template_dir = os.path.join(os.path.dirname(__file__), "templates/dot2k")
 
         if self.container:
             if file_path:
@@ -33,9 +35,7 @@ class dot2k(Dot2c):
             self.name = extra_params.get("model_name")
             self.events = []
             self.states = []
-            self.main_c = self.__read_file(self.monitor_templates_dir + "main_container.c")
-            self.main_h = self.__read_file(self.monitor_templates_dir + "main_container.h")
-            self.kconfig = self.__read_file(self.monitor_templates_dir + "Kconfig_container")
+            self.main_h = self._read_template_file("main.h")
         else:
             super().__init__(file_path, extra_params.get("model_name"))
 
@@ -43,35 +43,16 @@ class dot2k(Dot2c):
             if self.monitor_type is None:
                 raise ValueError("Unknown monitor type: %s" % MonitorType)
             self.monitor_type = MonitorType
-            self.main_c = self.__read_file(self.monitor_templates_dir + "main.c")
-            self.trace_h = self.__read_file(self.monitor_templates_dir + "trace.h")
-            self.kconfig = self.__read_file(self.monitor_templates_dir + "Kconfig")
+            self.trace_h = self._read_template_file("trace.h")
+
+        self.main_c = self._read_template_file("main.c")
+        self.kconfig = self._read_template_file("Kconfig")
         self.enum_suffix = "_%s" % self.name
         self.description = extra_params.get("description", self.name) or "auto-generated"
         self.auto_patch = extra_params.get("auto_patch")
         if self.auto_patch:
             self.__fill_rv_kernel_dir()
 
-    def __fill_rv_templates_dir(self):
-
-        if os.path.exists(self.monitor_templates_dir):
-            return
-
-        if platform.system() != "Linux":
-            raise OSError("I can only run on Linux.")
-
-        kernel_path = "/lib/modules/%s/build/tools/verification/rvgen/dot2k_templates/" % (platform.release())
-
-        if os.path.exists(kernel_path):
-            self.monitor_templates_dir = kernel_path
-            return
-
-        if os.path.exists("/usr/share/rvgen/dot2k_templates/"):
-            self.monitor_templates_dir = "/usr/share/rvgen/dot2k_templates/"
-            return
-
-        raise FileNotFoundError("Could not find the template directory, do you have the kernel source installed?")
-
     def __fill_rv_kernel_dir(self):
 
         # first try if we are running in the kernel tree root
@@ -109,6 +90,16 @@ class dot2k(Dot2c):
         fd.close()
         return content
 
+    def _read_template_file(self, file):
+        try:
+            path = os.path.join(self.abs_template_dir, file)
+            return self.__read_file(path)
+        except Exception:
+            # Specific template file not found. Try the generic template file in the template/
+            # directory, which is one level up
+            path = os.path.join(self.abs_template_dir, "..", file)
+            return self.__read_file(path)
+
     def fill_monitor_type(self):
         return self.monitor_type.upper()