drivers/hwtracing/coresight/Kconfig | 9 +++ drivers/hwtracing/coresight/Makefile | 3 +- drivers/hwtracing/coresight/coresight-core.c | 1 + .../hwtracing/coresight/coresight-kunit-tests.c | 77 ++++++++++++++++++++++ 4 files changed, 88 insertions(+), 2 deletions(-)
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@linaro.org>
---
Changes in v2:
- Let devm free everything rather than doing individual kfrees:
"Like with managed drivers, KUnit-managed fake devices are
automatically cleaned up when the test finishes, but can be manually
cleaned up early with kunit_device_unregister()."
- Link to v1: https://lore.kernel.org/r/20250225164639.522741-1-james.clark@linaro.org
---
drivers/hwtracing/coresight/Kconfig | 9 +++
drivers/hwtracing/coresight/Makefile | 3 +-
drivers/hwtracing/coresight/coresight-core.c | 1 +
.../hwtracing/coresight/coresight-kunit-tests.c | 77 ++++++++++++++++++++++
4 files changed, 88 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index ecd7086a5b83..f064e3d172b3 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -259,4 +259,13 @@ 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 8e62c3150aeb..96f0dfedb1bf 100644
--- a/drivers/hwtracing/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
@@ -51,5 +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-$(CONFIG_CORESIGHT_CTCU) += coresight-ctcu.o
-coresight-ctcu-y := coresight-ctcu-core.o
+obj-$(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 bd0a7edd38c9..b101aa133ceb 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -959,6 +959,7 @@ 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..a136af05eaf4
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-kunit-tests.c
@@ -0,0 +1,77 @@
+// 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 int coresight_test_cpuid(struct coresight_device *csdev)
+{
+ return 0;
+}
+
+static void test_default_sink(struct kunit *test)
+{
+ /*
+ * ETM -> ETF -> ETR -> CATU
+ * ^
+ * | default
+ */
+ struct device *dev = kunit_device_register(test, "coresight_kunit");
+ struct coresight_device *etm = coresight_test_device(dev),
+ *etf = coresight_test_device(dev),
+ *etr = coresight_test_device(dev),
+ *catu = coresight_test_device(dev);
+ struct coresight_connection conn = {};
+ struct coresight_ops_source src_ops = {.cpu_id = coresight_test_cpuid };
+ struct coresight_ops etm_cs_ops = { .source_ops = &src_ops };
+
+ etm->type = CORESIGHT_DEV_TYPE_SOURCE;
+ etm->ops = &etm_cs_ops;
+ etf->type = CORESIGHT_DEV_TYPE_LINKSINK;
+ etf->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
+ etr->type = CORESIGHT_DEV_TYPE_SINK;
+ etr->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM;
+ catu->type = CORESIGHT_DEV_TYPE_HELPER;
+
+ conn.src_dev = etm;
+ conn.dest_dev = etf;
+ coresight_add_out_conn(dev, etm->pdata, &conn);
+
+ conn.src_dev = etf;
+ conn.dest_dev = etr;
+ coresight_add_out_conn(dev, etf->pdata, &conn);
+
+ conn.src_dev = etr;
+ conn.dest_dev = catu;
+ coresight_add_out_conn(dev, etr->pdata, &conn);
+
+ KUNIT_ASSERT_PTR_EQ(test, coresight_find_default_sink(etm), etr);
+}
+
+static struct kunit_case coresight_testcases[] = {
+ KUNIT_CASE(test_default_sink),
+ {}
+};
+
+static struct kunit_suite coresight_test_suite = {
+ .name = "coresight_test_suite",
+ .test_cases = coresight_testcases,
+};
+
+kunit_test_suites(&coresight_test_suite);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Clark <james.clark@linaro.org>");
+MODULE_DESCRIPTION("Arm CoreSight KUnit tests");
---
base-commit: eeafe6a8790ea125252ca2e23c1a2469eaff1d9a
change-id: 20250305-james-cs-kunit-test-3af1df2401e6
Best regards,
--
James Clark <james.clark@linaro.org>On 05/03/2025 15:07, 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@linaro.org>
> ---
> Changes in v2:
> - Let devm free everything rather than doing individual kfrees:
> "Like with managed drivers, KUnit-managed fake devices are
> automatically cleaned up when the test finishes, but can be manually
> cleaned up early with kunit_device_unregister()."
> - Link to v1: https://lore.kernel.org/r/20250225164639.522741-1-james.clark@linaro.org
> ---
> drivers/hwtracing/coresight/Kconfig | 9 +++
> drivers/hwtracing/coresight/Makefile | 3 +-
> drivers/hwtracing/coresight/coresight-core.c | 1 +
> .../hwtracing/coresight/coresight-kunit-tests.c | 77 ++++++++++++++++++++++
> 4 files changed, 88 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> index ecd7086a5b83..f064e3d172b3 100644
> --- a/drivers/hwtracing/coresight/Kconfig
> +++ b/drivers/hwtracing/coresight/Kconfig
> @@ -259,4 +259,13 @@ 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 8e62c3150aeb..96f0dfedb1bf 100644
> --- a/drivers/hwtracing/coresight/Makefile
> +++ b/drivers/hwtracing/coresight/Makefile
> @@ -51,5 +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-$(CONFIG_CORESIGHT_CTCU) += coresight-ctcu.o
> -coresight-ctcu-y := coresight-ctcu-core.o
> +obj-$(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 bd0a7edd38c9..b101aa133ceb 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -959,6 +959,7 @@ 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..a136af05eaf4
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-kunit-tests.c
> @@ -0,0 +1,77 @@
> +// 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 int coresight_test_cpuid(struct coresight_device *csdev)
> +{
> + return 0;
> +}
> +
> +static void test_default_sink(struct kunit *test)
> +{
> + /*
> + * ETM -> ETF -> ETR -> CATU
> + * ^
> + * | default
> + */
> + struct device *dev = kunit_device_register(test, "coresight_kunit");
> + struct coresight_device *etm = coresight_test_device(dev),
> + *etf = coresight_test_device(dev),
> + *etr = coresight_test_device(dev),
> + *catu = coresight_test_device(dev);
> + struct coresight_connection conn = {};
> + struct coresight_ops_source src_ops = {.cpu_id = coresight_test_cpuid };
Do we need the trace_id() ? Why is this required ?
Suzuki
> + struct coresight_ops etm_cs_ops = { .source_ops = &src_ops };
> +
> + etm->type = CORESIGHT_DEV_TYPE_SOURCE;
> + etm->ops = &etm_cs_ops;
> + etf->type = CORESIGHT_DEV_TYPE_LINKSINK;
> + etf->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> + etr->type = CORESIGHT_DEV_TYPE_SINK;
> + etr->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM;
> + catu->type = CORESIGHT_DEV_TYPE_HELPER;
> +
> + conn.src_dev = etm;
> + conn.dest_dev = etf;
> + coresight_add_out_conn(dev, etm->pdata, &conn);
> +
> + conn.src_dev = etf;
> + conn.dest_dev = etr;
> + coresight_add_out_conn(dev, etf->pdata, &conn);
> +
> + conn.src_dev = etr;
> + conn.dest_dev = catu;
> + coresight_add_out_conn(dev, etr->pdata, &conn);
> +
> + KUNIT_ASSERT_PTR_EQ(test, coresight_find_default_sink(etm), etr);
> +}
> +
> +static struct kunit_case coresight_testcases[] = {
> + KUNIT_CASE(test_default_sink),
> + {}
> +};
> +
> +static struct kunit_suite coresight_test_suite = {
> + .name = "coresight_test_suite",
> + .test_cases = coresight_testcases,
> +};
> +
> +kunit_test_suites(&coresight_test_suite);
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("James Clark <james.clark@linaro.org>");
> +MODULE_DESCRIPTION("Arm CoreSight KUnit tests");
>
> ---
> base-commit: eeafe6a8790ea125252ca2e23c1a2469eaff1d9a
> change-id: 20250305-james-cs-kunit-test-3af1df2401e6
>
> Best regards,
On 11/03/2025 3:00 pm, Suzuki K Poulose wrote:
> On 05/03/2025 15:07, 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@linaro.org>
>> ---
>> Changes in v2:
>> - Let devm free everything rather than doing individual kfrees:
>> "Like with managed drivers, KUnit-managed fake devices are
>> automatically cleaned up when the test finishes, but can be manually
>> cleaned up early with kunit_device_unregister()."
>> - Link to v1: https://lore.kernel.org/r/20250225164639.522741-1-
>> james.clark@linaro.org
>> ---
>> drivers/hwtracing/coresight/Kconfig | 9 +++
>> drivers/hwtracing/coresight/Makefile | 3 +-
>> drivers/hwtracing/coresight/coresight-core.c | 1 +
>> .../hwtracing/coresight/coresight-kunit-tests.c | 77 ++++++++++++
>> ++++++++++
>> 4 files changed, 88 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/
>> coresight/Kconfig
>> index ecd7086a5b83..f064e3d172b3 100644
>> --- a/drivers/hwtracing/coresight/Kconfig
>> +++ b/drivers/hwtracing/coresight/Kconfig
>> @@ -259,4 +259,13 @@ 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 8e62c3150aeb..96f0dfedb1bf 100644
>> --- a/drivers/hwtracing/coresight/Makefile
>> +++ b/drivers/hwtracing/coresight/Makefile
>> @@ -51,5 +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-$(CONFIG_CORESIGHT_CTCU) += coresight-ctcu.o
>> -coresight-ctcu-y := coresight-ctcu-core.o
>> +obj-$(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 bd0a7edd38c9..b101aa133ceb 100644
>> --- a/drivers/hwtracing/coresight/coresight-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>> @@ -959,6 +959,7 @@ 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..a136af05eaf4
>> --- /dev/null
>> +++ b/drivers/hwtracing/coresight/coresight-kunit-tests.c
>> @@ -0,0 +1,77 @@
>> +// 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 int coresight_test_cpuid(struct coresight_device *csdev)
>> +{
>> + return 0;
>> +}
>> +
>> +static void test_default_sink(struct kunit *test)
>> +{
>> + /*
>> + * ETM -> ETF -> ETR -> CATU
>> + * ^
>> + * | default
>> + */
>> + struct device *dev = kunit_device_register(test, "coresight_kunit");
>> + struct coresight_device *etm = coresight_test_device(dev),
>> + *etf = coresight_test_device(dev),
>> + *etr = coresight_test_device(dev),
>> + *catu = coresight_test_device(dev);
>> + struct coresight_connection conn = {};
>> + struct coresight_ops_source src_ops = {.cpu_id =
>> coresight_test_cpuid };
>
> Do we need the trace_id() ? Why is this required ?
>
> Suzuki
>
Because it tests with per-cpu sources so it checks if any of the TRBE
sinks have been assigned first:
/* look for a default sink if we have not found for this device */
if (!csdev->def_sink) {
if (coresight_is_percpu_source(csdev))
csdev->def_sink = per_cpu(csdev_sink,
source_ops(csdev)->cpu_id(csdev));
I think this test would probably fail if run somewhere TRBE was already
probed. I can make the source subtype to be
CORESIGHT_DEV_SUBTYPE_SOURCE_BUS for the test to work around it. Any
value other than CORESIGHT_DEV_SUBTYPE_SOURCE_PROC will work. And then I
can drop the fake cpu_id() callback.
On 11/03/2025 16:06, James Clark wrote:
>
>
> On 11/03/2025 3:00 pm, Suzuki K Poulose wrote:
>> On 05/03/2025 15:07, 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@linaro.org>
>>> ---
>>> Changes in v2:
>>> - Let devm free everything rather than doing individual kfrees:
>>> "Like with managed drivers, KUnit-managed fake devices are
>>> automatically cleaned up when the test finishes, but can be manually
>>> cleaned up early with kunit_device_unregister()."
>>> - Link to v1: https://lore.kernel.org/r/20250225164639.522741-1-
>>> james.clark@linaro.org
>>> ---
>>> drivers/hwtracing/coresight/Kconfig | 9 +++
>>> drivers/hwtracing/coresight/Makefile | 3 +-
>>> drivers/hwtracing/coresight/coresight-core.c | 1 +
>>> .../hwtracing/coresight/coresight-kunit-tests.c | 77 +++++++++++
>>> + ++++++++++
>>> 4 files changed, 88 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/
>>> coresight/Kconfig
>>> index ecd7086a5b83..f064e3d172b3 100644
>>> --- a/drivers/hwtracing/coresight/Kconfig
>>> +++ b/drivers/hwtracing/coresight/Kconfig
>>> @@ -259,4 +259,13 @@ 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 8e62c3150aeb..96f0dfedb1bf 100644
>>> --- a/drivers/hwtracing/coresight/Makefile
>>> +++ b/drivers/hwtracing/coresight/Makefile
>>> @@ -51,5 +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-$(CONFIG_CORESIGHT_CTCU) += coresight-ctcu.o
>>> -coresight-ctcu-y := coresight-ctcu-core.o
>>> +obj-$(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 bd0a7edd38c9..b101aa133ceb 100644
>>> --- a/drivers/hwtracing/coresight/coresight-core.c
>>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>>> @@ -959,6 +959,7 @@ 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..a136af05eaf4
>>> --- /dev/null
>>> +++ b/drivers/hwtracing/coresight/coresight-kunit-tests.c
>>> @@ -0,0 +1,77 @@
>>> +// 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 int coresight_test_cpuid(struct coresight_device *csdev)
>>> +{
>>> + return 0;
>>> +}
>>> +
>>> +static void test_default_sink(struct kunit *test)
>>> +{
>>> + /*
>>> + * ETM -> ETF -> ETR -> CATU
>>> + * ^
>>> + * | default
>>> + */
>>> + struct device *dev = kunit_device_register(test,
>>> "coresight_kunit");
>>> + struct coresight_device *etm = coresight_test_device(dev),
>>> + *etf = coresight_test_device(dev),
>>> + *etr = coresight_test_device(dev),
>>> + *catu = coresight_test_device(dev);
>>> + struct coresight_connection conn = {};
>>> + struct coresight_ops_source src_ops = {.cpu_id =
>>> coresight_test_cpuid };
>>
>> Do we need the trace_id() ? Why is this required ?
>>
>> Suzuki
>>
>
> Because it tests with per-cpu sources so it checks if any of the TRBE
> sinks have been assigned first:
>
> /* look for a default sink if we have not found for this device */
> if (!csdev->def_sink) {
> if (coresight_is_percpu_source(csdev))
> csdev->def_sink = per_cpu(csdev_sink,
> source_ops(csdev)->cpu_id(csdev));
>
> I think this test would probably fail if run somewhere TRBE was already
> probed. I can make the source subtype to be
> CORESIGHT_DEV_SUBTYPE_SOURCE_BUS for the test to work around it. Any
> value other than CORESIGHT_DEV_SUBTYPE_SOURCE_PROC will work. And then I
> can drop the fake cpu_id() callback.
If the purpose is to detect the ETR, then I guess we could make this a
non-ETM source
TBH, I don't see any value in the test as such. But it is a good
starting point for adding further cases. So, lets keep this in.
Suzuki
>
On Wed, Mar 05, 2025 at 03:07:19PM +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@linaro.org>
LGTM:
Reviewed-by: Leo Yan <leo.yan@arm.com>
> ---
> Changes in v2:
> - Let devm free everything rather than doing individual kfrees:
> "Like with managed drivers, KUnit-managed fake devices are
> automatically cleaned up when the test finishes, but can be manually
> cleaned up early with kunit_device_unregister()."
> - Link to v1: https://lore.kernel.org/r/20250225164639.522741-1-james.clark@linaro.org
> ---
> drivers/hwtracing/coresight/Kconfig | 9 +++
> drivers/hwtracing/coresight/Makefile | 3 +-
> drivers/hwtracing/coresight/coresight-core.c | 1 +
> .../hwtracing/coresight/coresight-kunit-tests.c | 77 ++++++++++++++++++++++
> 4 files changed, 88 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> index ecd7086a5b83..f064e3d172b3 100644
> --- a/drivers/hwtracing/coresight/Kconfig
> +++ b/drivers/hwtracing/coresight/Kconfig
> @@ -259,4 +259,13 @@ 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 8e62c3150aeb..96f0dfedb1bf 100644
> --- a/drivers/hwtracing/coresight/Makefile
> +++ b/drivers/hwtracing/coresight/Makefile
> @@ -51,5 +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-$(CONFIG_CORESIGHT_CTCU) += coresight-ctcu.o
> -coresight-ctcu-y := coresight-ctcu-core.o
> +obj-$(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 bd0a7edd38c9..b101aa133ceb 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -959,6 +959,7 @@ 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..a136af05eaf4
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-kunit-tests.c
> @@ -0,0 +1,77 @@
> +// 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 int coresight_test_cpuid(struct coresight_device *csdev)
> +{
> + return 0;
> +}
> +
> +static void test_default_sink(struct kunit *test)
> +{
> + /*
> + * ETM -> ETF -> ETR -> CATU
> + * ^
> + * | default
> + */
> + struct device *dev = kunit_device_register(test, "coresight_kunit");
> + struct coresight_device *etm = coresight_test_device(dev),
> + *etf = coresight_test_device(dev),
> + *etr = coresight_test_device(dev),
> + *catu = coresight_test_device(dev);
> + struct coresight_connection conn = {};
> + struct coresight_ops_source src_ops = {.cpu_id = coresight_test_cpuid };
> + struct coresight_ops etm_cs_ops = { .source_ops = &src_ops };
> +
> + etm->type = CORESIGHT_DEV_TYPE_SOURCE;
> + etm->ops = &etm_cs_ops;
> + etf->type = CORESIGHT_DEV_TYPE_LINKSINK;
> + etf->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> + etr->type = CORESIGHT_DEV_TYPE_SINK;
> + etr->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM;
> + catu->type = CORESIGHT_DEV_TYPE_HELPER;
> +
> + conn.src_dev = etm;
> + conn.dest_dev = etf;
> + coresight_add_out_conn(dev, etm->pdata, &conn);
> +
> + conn.src_dev = etf;
> + conn.dest_dev = etr;
> + coresight_add_out_conn(dev, etf->pdata, &conn);
> +
> + conn.src_dev = etr;
> + conn.dest_dev = catu;
> + coresight_add_out_conn(dev, etr->pdata, &conn);
> +
> + KUNIT_ASSERT_PTR_EQ(test, coresight_find_default_sink(etm), etr);
> +}
> +
> +static struct kunit_case coresight_testcases[] = {
> + KUNIT_CASE(test_default_sink),
> + {}
> +};
> +
> +static struct kunit_suite coresight_test_suite = {
> + .name = "coresight_test_suite",
> + .test_cases = coresight_testcases,
> +};
> +
> +kunit_test_suites(&coresight_test_suite);
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("James Clark <james.clark@linaro.org>");
> +MODULE_DESCRIPTION("Arm CoreSight KUnit tests");
>
> ---
> base-commit: eeafe6a8790ea125252ca2e23c1a2469eaff1d9a
> change-id: 20250305-james-cs-kunit-test-3af1df2401e6
>
> Best regards,
> --
> James Clark <james.clark@linaro.org>
>
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