Re: [PATCH] coresight: Add a KUnit test for coresight_find_default_sink()
From: James Clark
Date: Wed Mar 05 2025 - 08:53:02 EST
On 05/03/2025 11:42 am, Leo Yan wrote:
On Tue, Dec 17, 2024 at 05:11:31PM +0000, James Clark wrote:
Add a test to confirm that default sink selection skips over an ETF
and returns an ETR even if it's further away.
This also makes it easier to add new unit tests in the future.
Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
---
drivers/hwtracing/coresight/Kconfig | 9 ++
drivers/hwtracing/coresight/Makefile | 1 +
drivers/hwtracing/coresight/coresight-core.c | 1 +
.../coresight/coresight-kunit-tests.c | 90 +++++++++++++++++++
4 files changed, 101 insertions(+)
create mode 100644 drivers/hwtracing/coresight/coresight-kunit-tests.c
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index 06f0a7594169..056d04bc540a 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -247,4 +247,13 @@ config CORESIGHT_DUMMY
To compile this driver as a module, choose M here: the module will be
called coresight-dummy.
+
+config CORESIGHT_KUNIT_TESTS
+ tristate "Enable Coresight unit tests"
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Enable Coresight unit tests. Only useful for development and not
+ intended for production.
+
endif
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 4ba478211b31..c170a41b3056 100644
--- a/drivers/hwtracing/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
@@ -51,3 +51,4 @@ coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \
coresight-cti-sysfs.o
obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb.o
obj-$(CONFIG_CORESIGHT_DUMMY) += coresight-dummy.o
+obj-$(CONFIG_CORESIGHT_KUNIT_TESTS) += coresight-kunit-tests.o
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index ea38ecf26fcb..ce63b68d5503 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -869,6 +869,7 @@ coresight_find_default_sink(struct coresight_device *csdev)
}
return csdev->def_sink;
}
+EXPORT_SYMBOL_GPL(coresight_find_default_sink);
static int coresight_remove_sink_ref(struct device *dev, void *data)
{
diff --git a/drivers/hwtracing/coresight/coresight-kunit-tests.c b/drivers/hwtracing/coresight/coresight-kunit-tests.c
new file mode 100644
index 000000000000..d022bacc8357
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-kunit-tests.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <kunit/test.h>
+#include <kunit/device.h>
+#include <linux/coresight.h>
+
+#include "coresight-priv.h"
+
+static struct coresight_device *coresight_test_device(struct device *dev)
+{
+ struct coresight_device *csdev = devm_kcalloc(dev, 1,
+ sizeof(struct coresight_device),
+ GFP_KERNEL);
+ csdev->pdata = devm_kcalloc(dev, 1,
+ sizeof(struct coresight_platform_data),
+ GFP_KERNEL);
+ return csdev;
+}
+
+static void coresight_free_test_device(struct device *dev,
+ struct coresight_device *csdev)
+{
+ devm_kfree(dev, csdev->pdata->out_conns);
It will lead memory leaking if we don't release connections pointed by
'out_conns' pointer array. Something like:
for (i = 0; i < csdev->pdata->nr_outconns; i++)
devm_kfree(dev, csdev->pdata->out_conns[i]);
devm_kfree(dev, csdev->pdata->out_conns);
Otherwise, it looks good to me.
Thanks,
Leo
Ah yeah, I'll just free the whole device instead of the individual
kfrees then and let devm handle it.