debug: tester loadable module framework

Tester module is a framework for a runtime testing
that need a special internal code i.e. provide an extra
load to CPU by running additional thread, etc.

The idea is to allow testing of special cases
using a standard "production" build. The module should
be compiled as a loadable module only, as it is not needed
in any real production case.

In order to keep only one testing module (in meaning of
a SOF module with separate UUID), a framework is introduced,
where a test to be executed is selected by IPC parameter

Signed-off-by: Marcin Szkudlinski <marcin.szkudlinski@intel.com>

app/configs/mtl/modules.conf

@@ -20,3 +20,4 @@ CONFIG_COMP_CROSSOVER=m
 CONFIG_COMP_MULTIBAND_DRC=m
 CONFIG_COMP_GOOGLE_CTC_AUDIO_PROCESSING=m
 CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=m
+CONFIG_COMP_TESTER=m

src/Kconfig

@@ -25,3 +25,5 @@ rsource "library_manager/Kconfig"
 rsource "debug/telemetry/Kconfig"
 
 rsource "debug/debug_stream/Kconfig"
+
+rsource "debug/tester/Kconfig"

src/debug/CMakeLists.txt

@@ -4,4 +4,8 @@ if(CONFIG_GDB_DEBUG)
 	add_subdirectory(gdb)
 endif()
 
+if(CONFIG_COMP_TESTER)
+	add_subdirectory(tester)
+endif()
+
 add_local_sources(sof panic.c)

src/debug/tester/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_local_sources(tester.c)
+add_local_sources(tester_dummy_test.c)

src/debug/tester/Kconfig

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+config COMP_TESTER
+	tristate "tester module"
+	default n
+	depends on IPC_MAJOR_4
+	help
+	  Build a tester module. To be used in continous 
+	  integration process for special test cases that
+	  require a test code injected into the system itself

src/debug/tester/llext/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (c) 2024 Intel Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+sof_llext_build("tester"
+	SOURCES ../tester.c
+		../tester_dummy_test.c
+)

src/debug/tester/llext/llext.toml.h

@@ -0,0 +1,6 @@
+#include <tools/rimage/config/platform.toml>
+#define LOAD_TYPE "2"
+#include "../tester.toml"
+
+[module]
+count = __COUNTER__

src/debug/tester/tester.c

@@ -0,0 +1,255 @@
+//SPDX-License-Identifier: BSD-3-Clause
+//
+// Copyright(c) 2025 Intel Corporation. All rights reserved.
+//
+// Author: Marcin Szkudlinski <marcin.szkudlinski@linux.intel.com>
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <rtos/init.h>
+#include <sof/lib/uuid.h>
+#include <sof/audio/component.h>
+#include <sof/audio/module_adapter/module/generic.h>
+#include <sof/audio/sink_api.h>
+#include <sof/audio/source_api.h>
+#include <sof/audio/sink_source_utils.h>
+#include "tester.h"
+#include "tester_dummy_test.h"
+
+/**
+ * Tester module is a framework for a runtime testing that need a special test code
+ * injected into the SOF system, i.e.
+ *  - provide an extra load to CPU by running additional thread
+ *  - execute some incorrect operations
+ *
+ * The idea is to allow using of special cases in testing like Continuous Integration or pre-release
+ * testing using a standard, production build.
+ *
+ * In order to have only one testing module (in meaning of a SOF module with separate UUID),
+ * a framework is introduced, where a test to be executed is selected by IPC parameter
+ *
+ * In production, module should be compiled as a loadable module, as it should not needed to be
+ * loaded and used on customers' boards.
+ * During developing, however, the module may be built in to keep debugging simpler
+ *
+ */
+
+LOG_MODULE_REGISTER(tester, CONFIG_SOF_LOG_LEVEL);
+
+SOF_DEFINE_REG_UUID(tester);
+
+DECLARE_TR_CTX(tester_tr, SOF_UUID(tester_uuid), LOG_LEVEL_INFO);
+
+struct tester_init_config {
+	struct ipc4_base_module_cfg ipc4_cfg;
+	int32_t test_type;
+} __attribute__((packed, aligned(4)));
+
+static int tester_init(struct processing_module *mod)
+{
+	struct module_data *md = &mod->priv;
+	struct comp_dev *dev = mod->dev;
+	struct module_config *cfg = &md->cfg;
+	size_t bs = cfg->size;
+	struct tester_module_data *cd = NULL;
+	int ret = 0;
+
+	if (bs != sizeof(struct tester_init_config)) {
+		comp_err(dev, "Invalid config");
+		return -EINVAL;
+	}
+
+	/* allocate ctx for test module in shared memory - to allow all non-standard operations
+	 * without problems with cache
+	 */
+	cd = rzalloc(SOF_MEM_ZONE_SYS_SHARED, 0, SOF_MEM_CAPS_RAM, sizeof(*cd));
+	if (!cd) {
+		comp_err(dev, "Out of memory");
+		return -ENOMEM;
+	}
+
+	struct tester_init_config *init_cfg = (struct tester_init_config *)cfg->init_data;
+
+	cd->test_case_type = init_cfg->test_type;
+	switch (cd->test_case_type) {
+	case TESTER_MODULE_CASE_DUMMY_TEST:
+		cd->tester_case_interface = &tester_interface_dummy_test;
+		break;
+
+	default:
+		comp_err(dev, "Invalid config, unknown test type");
+		rfree(cd);
+		return -EINVAL;
+	}
+
+	module_set_private_data(mod, cd);
+
+	if (cd->tester_case_interface->init)
+		ret = cd->tester_case_interface->init(mod, &cd->test_case_ctx);
+
+	if (ret) {
+		module_set_private_data(mod, NULL);
+		rfree(cd);
+	}
+
+	return ret;
+}
+
+static int tester_prepare(struct processing_module *mod,
+			  struct sof_source **sources, int num_of_sources,
+			  struct sof_sink **sinks, int num_of_sinks)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->prepare)
+		ret = cd->tester_case_interface->prepare(cd->test_case_ctx, mod,
+							 sources, num_of_sources,
+							 sinks, num_of_sinks);
+
+	return ret;
+}
+
+int tester_set_configuration(struct processing_module *mod,
+			     uint32_t config_id,
+			     enum module_cfg_fragment_position pos, uint32_t data_offset_size,
+			     const uint8_t *fragment, size_t fragment_size, uint8_t *response,
+			     size_t response_size)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->set_configuration)
+		ret = cd->tester_case_interface->set_configuration(
+				cd->test_case_ctx, mod, config_id, pos, data_offset_size,
+				fragment, fragment_size, response, response_size);
+
+	return ret;
+}
+
+static int tester_process(struct processing_module *mod,
+			  struct sof_source **sources, int num_of_sources,
+			  struct sof_sink **sinks, int num_of_sinks)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+	bool do_copy = true;
+
+	if (cd->tester_case_interface->process)
+		ret = cd->tester_case_interface->process(cd->test_case_ctx, mod,
+							 sources, num_of_sources,
+							 sinks, num_of_sinks, &do_copy);
+
+	if (!ret) {
+		size_t sink_free = sink_get_free_size(sinks[0]);
+		size_t source_avail = source_get_data_available(sources[0]);
+		size_t to_copy = MIN(sink_free, source_avail);
+
+		if (do_copy) {
+			/* copy data from input to output */
+			source_to_sink_copy(sources[0], sinks[0], true, to_copy);
+		} else {
+			/* drop data and generate silence */
+			source_drop_data(sources[0], to_copy);
+			sink_fill_with_silence(sinks[0], to_copy);
+		}
+	}
+
+	return ret;
+}
+
+static int tester_reset(struct processing_module *mod)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->reset)
+		ret = cd->tester_case_interface->reset(cd->test_case_ctx, mod);
+
+	return ret;
+}
+
+static int tester_free(struct processing_module *mod)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->free)
+		ret = cd->tester_case_interface->free(cd->test_case_ctx, mod);
+
+	rfree(cd);
+	module_set_private_data(mod, NULL);
+	return ret;
+}
+
+static int tester_bind(struct processing_module *mod, void *data)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->bind)
+		ret = cd->tester_case_interface->bind(cd->test_case_ctx, mod, data);
+
+	return ret;
+}
+
+static int tester_unbind(struct processing_module *mod, void *data)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->unbind)
+		ret = cd->tester_case_interface->unbind(cd->test_case_ctx, mod, data);
+
+	return ret;
+}
+
+static int tester_trigger(struct processing_module *mod, int cmd)
+{
+	struct tester_module_data *cd = module_get_private_data(mod);
+	int ret = 0;
+
+	if (cd->tester_case_interface->trigger)
+		ret = cd->tester_case_interface->trigger(cd->test_case_ctx, mod, cmd);
+
+	if (!ret)
+		ret = module_adapter_set_state(mod, mod->dev, cmd);
+
+	return ret;
+}
+
+static const struct module_interface tester_interface = {
+	.init = tester_init,
+	.prepare = tester_prepare,
+	.set_configuration = tester_set_configuration,
+	.process = tester_process,
+	.reset = tester_reset,
+	.free = tester_free,
+	.bind = tester_bind,
+	.unbind = tester_unbind,
+	.trigger = tester_trigger
+};
+
+DECLARE_MODULE_ADAPTER(tester_interface, tester_uuid, tester_tr);
+SOF_MODULE_INIT(tester, sys_comp_module_tester_interface_init);
+
+#if CONFIG_COMP_TESTER_MODULE
+/* modular: llext dynamic link */
+
+#include <module/module/api_ver.h>
+#include <module/module/llext.h>
+#include <rimage/sof/user/manifest.h>
+
+/* 08aeb4ff-7f68-4c71-86c3c842b4262898 */
+#define UUID_TESTER 0xff, 0xb4, 0xae, 0x08, 0x68, 0x7f, 0x71, 0x4c, \
+		 0x86, 0xc3, 0xc8, 0x42, 0xb4, 0x26, 0x28, 0x98
+
+SOF_LLEXT_MOD_ENTRY(tester, &tester_interface);
+
+static const struct sof_man_module_manifest mod_manifest __section(".module") __used =
+	SOF_LLEXT_MODULE_MANIFEST("TESTER", tester_llext_entry, 1, UUID_TESTER, 40);
+
+SOF_LLEXT_BUILDINFO;
+
+#endif