modules: generates per-target modinfo

This patch changes the way modinfo is generated and built. Instead of
one modinfo.c it generates one modinfo-<target>-softmmu.c per target. It
aims a fine-tune control of modules by configuring Kconfig.

Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
Message-Id: <165369003038.5857.13084289285185196779.stgit@work>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson.build

@@ -3175,14 +3175,23 @@ foreach d, list : target_modules
 endforeach
 
 if enable_modules
-  modinfo_src = custom_target('modinfo.c',
-                              output: 'modinfo.c',
-                              input: modinfo_files,
-                              command: [modinfo_generate, '@INPUT@'],
-                              capture: true)
-  modinfo_lib = static_library('modinfo', modinfo_src)
-  modinfo_dep = declare_dependency(link_whole: modinfo_lib)
-  softmmu_ss.add(modinfo_dep)
+  foreach target : target_dirs
+    if target.endswith('-softmmu')
+      config_target = config_target_mak[target]
+      config_devices_mak = target + '-config-devices.mak'
+      modinfo_src = custom_target('modinfo-' + target + '.c',
+                                  output: 'modinfo-' + target + '.c',
+                                  input: modinfo_files,
+                                  command: [modinfo_generate, '--devices', config_devices_mak, '@INPUT@'],
+                                  capture: true)
+
+      modinfo_lib = static_library('modinfo-' + target + '.c', modinfo_src)
+      modinfo_dep = declare_dependency(link_with: modinfo_lib)
+
+      arch = config_target['TARGET_NAME'] == 'sparc64' ? 'sparc64' : config_target['TARGET_BASE_ARCH']
+      hw_arch[arch].add(modinfo_dep)
+    endif
+  endforeach
 endif
 
 nm = find_program('nm')

scripts/modinfo-generate.py

@@ -32,7 +32,7 @@ def parse_line(line):
             continue
     return (kind, data)
 
-def generate(name, lines):
+def generate(name, lines, enabled):
     arch = ""
     objs = []
     deps = []
@@ -49,7 +49,13 @@ def generate(name, lines):
             elif kind == 'arch':
                 arch = data;
             elif kind == 'kconfig':
-                pass # ignore
+                # don't add a module which dependency is not enabled
+                # in kconfig
+                if data.strip() not in enabled:
+                    print("    /* module {} isn't enabled in Kconfig. */"
+                          .format(data.strip()))
+                    print("/* },{ */")
+                    return None
             else:
                 print("unknown:", kind)
                 exit(1)
@@ -60,8 +66,8 @@ def generate(name, lines):
     print_array("objs", objs)
     print_array("deps", deps)
     print_array("opts", opts)
-    print("},{");
-    return deps
+    print("},{")
+    return {dep.strip('" ') for dep in deps}
 
 def print_pre():
     print("/* generated by scripts/modinfo-generate.py */")
@@ -74,23 +80,38 @@ def print_post():
     print("}};")
 
 def main(args):
-    deps = {}
+    if len(args) < 3 or args[0] != '--devices':
+        print('Expected: modinfo-generate.py --devices '
+              'config-device.mak [modinfo files]', file=sys.stderr)
+        exit(1)
+
+    # get all devices enabled in kconfig, from *-config-device.mak
+    enabled = set()
+    with open(args[1]) as file:
+        for line in file.readlines():
+            config = line.split('=')
+            if config[1].rstrip() == 'y':
+                enabled.add(config[0][7:]) # remove CONFIG_
+
+    deps = set()
+    modules = set()
     print_pre()
-    for modinfo in args:
+    for modinfo in args[2:]:
         with open(modinfo) as f:
             lines = f.readlines()
         print("    /* %s */" % modinfo)
-        (basename, ext) = os.path.splitext(modinfo)
-        deps[basename] = generate(basename, lines)
+        (basename, _) = os.path.splitext(modinfo)
+        moddeps = generate(basename, lines, enabled)
+        if moddeps is not None:
+            modules.add(basename)
+            deps.update(moddeps)
     print_post()
 
-    flattened_deps = {flat.strip('" ') for dep in deps.values() for flat in dep}
     error = False
-    for dep in flattened_deps:
-        if dep not in deps.keys():
-            print("Dependency {} cannot be satisfied".format(dep),
-                  file=sys.stderr)
-            error = True
+    for dep in deps.difference(modules):
+        print("Dependency {} cannot be satisfied".format(dep),
+              file=sys.stderr)
+        error = True
 
     if error:
         exit(1)