libcamera: ipa_module_info: update struct to allow IPA matching

We need a way to match pipelines with IPA modules, so add fields in
IPAModuleInfo to hold the IPA module API version number, the pipeline
name, and the pipeline version.

The module API version is used to determine the layout of struct
IPAModuleInfo.

Also update IPA module tests and Doxygen accordingly. Doxygen needs to
be updated to accomodate __attribute__((packed)).

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Documentation/Doxyfile.in

@@ -2016,7 +2016,7 @@ ENABLE_PREPROCESSING   = YES
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-MACRO_EXPANSION        = NO
+MACRO_EXPANSION        = YES
 
 # If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES then
 # the macro expansion is limited to the macros specified with the PREDEFINED and
@@ -2024,7 +2024,7 @@ MACRO_EXPANSION        = NO
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-EXPAND_ONLY_PREDEF     = NO
+EXPAND_ONLY_PREDEF     = YES
 
 # If the SEARCH_INCLUDES tag is set to YES, the include files in the
 # INCLUDE_PATH will be searched if a #include is found.
@@ -2057,7 +2057,8 @@ INCLUDE_FILE_PATTERNS  = *.h
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
 PREDEFINED             = __DOXYGEN__ \
-                         __cplusplus
+                         __cplusplus \
+                         __attribute__(x)=
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The

include/libcamera/ipa/ipa_module_info.h

@@ -7,14 +7,20 @@
 #ifndef __LIBCAMERA_IPA_MODULE_INFO_H__
 #define __LIBCAMERA_IPA_MODULE_INFO_H__
 
+#include <stdint.h>
+
+#define IPA_MODULE_API_VERSION 1
+
 #ifdef __cplusplus
 namespace libcamera {
 #endif
 
 struct IPAModuleInfo {
+	int moduleAPIVersion;
+	uint32_t pipelineVersion;
+	char pipelineName[256];
 	char name[256];
-	unsigned int version;
-};
+} __attribute__((packed));
 
 #ifdef __cplusplus
 extern "C" {

src/libcamera/ipa_module.cpp

@@ -169,6 +169,17 @@ int elfLoadSymbol(void *dst, size_t size, void *map, size_t soSize,
 
 } /* namespace */
 
+/**
+ * \def IPA_MODULE_API_VERSION
+ * \brief The IPA module API version
+ *
+ * This version number specifies the version for the layout of
+ * struct IPAModuleInfo. The IPA module shall use this macro to
+ * set its moduleAPIVersion field.
+ *
+ * \sa IPAModuleInfo::moduleAPIVersion
+ */
+
 /**
  * \struct IPAModuleInfo
  * \brief Information of an IPA module
@@ -176,14 +187,23 @@ int elfLoadSymbol(void *dst, size_t size, void *map, size_t soSize,
  * This structure contains the information of an IPA module. It is loaded,
  * read, and validated before anything else is loaded from the shared object.
  *
+ * \var IPAModuleInfo::moduleAPIVersion
+ * \brief The IPA module API version that the IPA module implements
+ *
+ * This version number specifies the version for the layout of
+ * struct IPAModuleInfo. The IPA module shall report here the version that
+ * it was built for, using the macro IPA_MODULE_API_VERSION.
+ *
+ * \var IPAModuleInfo::pipelineVersion
+ * \brief The pipeline handler version that the IPA module is for
+ *
+ * \var IPAModuleInfo::pipelineName
+ * \brief The name of the pipeline handler that the IPA module is for
+ *
+ * This name is used to match a pipeline handler with the module.
+ *
  * \var IPAModuleInfo::name
  * \brief The name of the IPA module
- *
- * \var IPAModuleInfo::version
- * \brief The version of the IPA module
- *
- * \todo abi compatability version
- * \todo pipeline compatability matcher
  */
 
 /**

test/ipa/ipa_test.cpp

@@ -33,18 +33,17 @@ protected:
 
 		const struct IPAModuleInfo &info = ll->info();
 
-		if (strcmp(info.name, testInfo.name)) {
-			cerr << "test IPA module has incorrect name" << endl;
-			cerr << "expected \"" << testInfo.name << "\", got \""
-			     << info.name << "\"" << endl;
-			ret = -1;
-		}
-
-		if (info.version != testInfo.version) {
-			cerr << "test IPA module has incorrect version" << endl;
-			cerr << "expected \"" << testInfo.version << "\", got \""
-			     << info.version << "\"" << endl;
-			ret = -1;
+		if (memcmp(&info, &testInfo, sizeof(info))) {
+			cerr << "IPA module information mismatch: expected:" << endl
+			     << "moduleAPIVersion = "     << testInfo.moduleAPIVersion << endl
+			     << "pipelineVersion = "      << testInfo.pipelineVersion << endl
+			     << "pipelineName = "         << testInfo.pipelineName << endl
+			     << "name = "                 << testInfo.name
+			     << "got: " << endl
+			     << "moduleAPIVersion = "     << info.moduleAPIVersion << endl
+			     << "pipelineVersion = "      << info.pipelineVersion << endl
+			     << "pipelineName = "         << info.pipelineName << endl
+			     << "name = "                 << info.name << endl;
 		}
 
 		delete ll;
@@ -56,8 +55,10 @@ protected:
 		int count = 0;
 
 		const struct IPAModuleInfo testInfo = {
-			"It's over nine thousand!",
+			IPA_MODULE_API_VERSION,
 			9001,
+			"bleep",
+			"It's over nine thousand!",
 		};
 
 		count += runTest("test/ipa/ipa-dummy-cpp.so", testInfo);

test/ipa/shared_test.cpp

@@ -4,8 +4,10 @@ namespace libcamera {
 
 extern "C" {
 const struct libcamera::IPAModuleInfo ipaModuleInfo = {
-	"It's over nine thousand!",
+	IPA_MODULE_API_VERSION,
 	9001,
+	"bleep",
+	"It's over nine thousand!",
 };
 };