test: ipa: Add test for the IPA Interface

Implement a basic test for IPA Interface using the VIMC dummy IPA
module. The test implements an out-of-band feedback channel between the
test and the dummy IPA module to verify the success of the IPA
interactions.

Test the only available operation defined by the IPA interface by
receiving a confirmation code on the fifo communication channel.

Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

test/ipa/ipa_interface_test.cpp

@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * ipa_interface_test.cpp - Test the IPA interface
+ */
+
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <iostream>
+
+#include <libcamera/event_dispatcher.h>
+#include <libcamera/event_notifier.h>
+#include <libcamera/timer.h>
+
+#include <ipa/ipa_vimc.h>
+
+#include "device_enumerator.h"
+#include "ipa_manager.h"
+#include "ipa_module.h"
+#include "pipeline_handler.h"
+#include "test.h"
+#include "thread.h"
+
+using namespace std;
+using namespace libcamera;
+
+class IPAInterfaceTest : public Test, public Object
+{
+public:
+	IPAInterfaceTest()
+		: trace_(IPAOperationNone), notifier_(nullptr), fd_(-1)
+	{
+	}
+
+	~IPAInterfaceTest()
+	{
+		delete notifier_;
+	}
+
+protected:
+	int init() override
+	{
+		/* Create a pipeline handler for vimc. */
+		std::vector<PipelineHandlerFactory *> &factories =
+			PipelineHandlerFactory::factories();
+		for (PipelineHandlerFactory *factory : factories) {
+			if (factory->name() == "PipelineHandlerVimc") {
+				pipe_ = factory->create(nullptr);
+				break;
+			}
+		}
+
+		if (!pipe_) {
+			cerr << "Vimc pipeline not found" << endl;
+			return TestPass;
+		}
+
+		/* Create and open the communication FIFO. */
+		int ret = mkfifo(VIMC_IPA_FIFO_PATH, S_IRUSR | S_IWUSR);
+		if (ret) {
+			ret = errno;
+			cerr << "Failed to create IPA test FIFO at '"
+			     << VIMC_IPA_FIFO_PATH << "': " << strerror(ret)
+			     << endl;
+			return TestFail;
+		}
+
+		ret = open(VIMC_IPA_FIFO_PATH, O_RDONLY | O_NONBLOCK);
+		if (ret < 0) {
+			ret = errno;
+			cerr << "Failed to open IPA test FIFO at '"
+			     << VIMC_IPA_FIFO_PATH << "': " << strerror(ret)
+			     << endl;
+			unlink(VIMC_IPA_FIFO_PATH);
+			return TestFail;
+		}
+		fd_ = ret;
+
+		notifier_ = new EventNotifier(fd_, EventNotifier::Read, this);
+		notifier_->activated.connect(this, &IPAInterfaceTest::readTrace);
+
+		return TestPass;
+	}
+
+	int run() override
+	{
+		EventDispatcher *dispatcher = thread()->eventDispatcher();
+		Timer timer;
+
+		ipa_ = IPAManager::instance()->createIPA(pipe_.get(), 0, 0);
+		if (!ipa_) {
+			cerr << "Failed to create VIMC IPA interface" << endl;
+			return TestFail;
+		}
+
+		/* Test initialization of IPA module. */
+		ipa_->init();
+		timer.start(1000);
+		while (timer.isRunning() && trace_ != IPAOperationInit)
+			dispatcher->processEvents();
+
+		if (trace_ != IPAOperationInit) {
+			cerr << "Failed to test IPA initialization sequence"
+			     << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup() override
+	{
+		close(fd_);
+		unlink(VIMC_IPA_FIFO_PATH);
+	}
+
+private:
+	void readTrace(EventNotifier *notifier)
+	{
+		ssize_t s = read(notifier->fd(), &trace_, sizeof(trace_));
+		if (s < 0) {
+			int ret = errno;
+			cerr << "Failed to read from IPA test FIFO at '"
+			     << VIMC_IPA_FIFO_PATH << "': " << strerror(ret)
+			     << endl;
+			trace_ = IPAOperationNone;
+		}
+	}
+
+	std::shared_ptr<PipelineHandler> pipe_;
+	std::unique_ptr<IPAInterface> ipa_;
+	enum IPAOperationCode trace_;
+	EventNotifier *notifier_;
+	int fd_;
+};
+
+TEST_REGISTER(IPAInterfaceTest)

test/ipa/meson.build

@@ -1,5 +1,6 @@
 ipa_test = [
     ['ipa_module_test',     'ipa_module_test.cpp'],
+    ['ipa_interface_test',  'ipa_interface_test.cpp'],
 ]
 
 foreach t : ipa_test