ipa: meson: Allow nested IPA directory structures

The current IPA build files require a flat directory structure for the
IPAs. Modify the build files to remove this restriction and allow a
directory structure such as:

src/ipa
  |- raspberrypi
      |- common
      |- cam_helpers
      |- controller
      |- vc4
  |- rkisp1
  |- ipu3

where each subdir (e.g. raspberrypi/common, raspberrypi/cam_helper) has
its own meson.build file. Such a directory structure will be introduced
for the Raspberry Pi IPA in a future commit.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

meson.build

@@ -262,7 +262,7 @@ py_mod.find_installation('python3', modules: py_modules)
 ## Summarise Configurations
 summary({
             'Enabled pipelines': pipelines,
-            'Enabled IPA modules': enabled_ipa_modules,
+            'Enabled IPA modules': enabled_ipa_names,
             'Tracing support': tracing_enabled,
             'Android support': android_enabled,
             'GStreamer support': gst_enabled,

src/ipa/ipu3/meson.build

@@ -29,3 +29,5 @@ if ipa_sign_module
                   install : false,
                   build_by_default : true)
 endif
+
+ipa_names += ipa_name

src/ipa/meson.build

@@ -36,16 +36,31 @@ if get_option('test') and 'vimc' not in ipa_modules
 endif
 
 enabled_ipa_modules = []
+enabled_ipa_names = []
+ipa_names = []
 
-# The ipa-sign-install.sh script which uses the ipa_names variable will itself
+subdirs = []
-# prepend MESON_INSTALL_DESTDIR_PREFIX to each ipa module name, therefore we
-# must not include the prefix string here.
 foreach pipeline : pipelines
-    if ipa_modules.contains(pipeline)
+    if not ipa_modules.contains(pipeline)
-        subdir(pipeline)
+        continue
-        ipa_names += ipa_install_dir / ipa_name + '.so'
-        enabled_ipa_modules += pipeline
     endif
+    enabled_ipa_names += pipeline
+
+    # Allow multi-level directory structuring for the IPAs if needed.
+    pipeline = pipeline.split('/')[0]
+    if pipeline in subdirs
+        continue
+    endif
+
+    subdir(pipeline)
+    subdirs += pipeline
+endforeach
+
+# The ipa-sign-install.sh script which uses the enabled_ipa_modules variable
+# will itself prepend MESON_INSTALL_DESTDIR_PREFIX to each ipa module name,
+# therefore we must not include the prefix string here.
+foreach ipa_name : ipa_names
+    enabled_ipa_modules += ipa_install_dir / ipa_name + '.so'
 endforeach
 
 if ipa_sign_module
@@ -54,5 +69,5 @@ if ipa_sign_module
     # install time, which invalidates the signatures.
     meson.add_install_script('ipa-sign-install.sh',
                              ipa_priv_key.full_path(),
-                             ipa_names)
+                             enabled_ipa_modules)
 endif

src/ipa/raspberrypi/meson.build

@@ -64,3 +64,5 @@ if ipa_sign_module
 endif
 
 subdir('data')
+
+ipa_names += ipa_name

src/ipa/rkisp1/meson.build

@@ -29,3 +29,5 @@ if ipa_sign_module
                   install : false,
                   build_by_default : true)
 endif
+
+ipa_names += ipa_name

src/ipa/vimc/meson.build

@@ -21,3 +21,5 @@ if ipa_sign_module
 endif
 
 subdir('data')
+
+ipa_names += ipa_name