Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

8 files changed, 1880 insertions, 0 deletions

diff --git a/drivers/base/test/.kunitconfig b/drivers/base/test/.kunitconfig
new file mode 100644
index 000000000..473923f09
--- /dev/null
+++ b/drivers/base/test/.kunitconfig
@@ -0,0 +1,2 @@
+CONFIG_KUNIT=y
+CONFIG_DM_KUNIT_TEST=y
diff --git a/drivers/base/test/Kconfig b/drivers/base/test/Kconfig
new file mode 100644
index 000000000..1ecf07912
--- /dev/null
+++ b/drivers/base/test/Kconfig
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0
+config TEST_ASYNC_DRIVER_PROBE
+	tristate "Build kernel module to test asynchronous driver probing"
+	depends on m
+	help
+	  Enabling this option produces a kernel module that allows
+	  testing asynchronous driver probing by the device core.
+	  The module name will be test_async_driver_probe.ko
+
+	  If unsure say N.
+
+config DM_KUNIT_TEST
+	tristate "KUnit Tests for the device model" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+
+config DRIVER_PE_KUNIT_TEST
+	tristate "KUnit Tests for property entry API" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+
+config DRIVER_SWNODE_KUNIT_TEST
+	tristate "KUnit Tests for software node fw_devlink links" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
diff --git a/drivers/base/test/Makefile b/drivers/base/test/Makefile
new file mode 100644
index 000000000..9ced7bbd5
--- /dev/null
+++ b/drivers/base/test/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_TEST_ASYNC_DRIVER_PROBE)	+= test_async_driver_probe.o
+
+obj-$(CONFIG_DM_KUNIT_TEST)	+= root-device-test.o
+obj-$(CONFIG_DM_KUNIT_TEST)	+= platform-device-test.o
+
+obj-$(CONFIG_DRIVER_PE_KUNIT_TEST) += property-entry-test.o
+CFLAGS_property-entry-test.o += $(DISABLE_STRUCTLEAK_PLUGIN)
+
+obj-$(CONFIG_DRIVER_SWNODE_KUNIT_TEST) += swnode-devlink-test.o
diff --git a/drivers/base/test/platform-device-test.c b/drivers/base/test/platform-device-test.c
new file mode 100644
index 000000000..9ce563f76
--- /dev/null
+++ b/drivers/base/test/platform-device-test.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <kunit/fwnode.h>
+#include <kunit/platform_device.h>
+#include <kunit/resource.h>
+
+#include <linux/device.h>
+#include <linux/device/bus.h>
+#include <linux/fwnode.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#define DEVICE_NAME "test"
+
+struct test_priv {
+	bool probe_done;
+	bool release_done;
+	wait_queue_head_t probe_wq;
+	wait_queue_head_t release_wq;
+	struct device *dev;
+};
+
+static int platform_device_devm_init(struct kunit *test)
+{
+	struct test_priv *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+	init_waitqueue_head(&priv->probe_wq);
+	init_waitqueue_head(&priv->release_wq);
+
+	test->priv = priv;
+
+	return 0;
+}
+
+static void devm_device_action(void *ptr)
+{
+	struct test_priv *priv = ptr;
+
+	priv->release_done = true;
+	wake_up_interruptible(&priv->release_wq);
+}
+
+static void devm_put_device_action(void *ptr)
+{
+	struct test_priv *priv = ptr;
+
+	put_device(priv->dev);
+	priv->release_done = true;
+	wake_up_interruptible(&priv->release_wq);
+}
+
+#define RELEASE_TIMEOUT_MS	100
+
+/*
+ * Tests that a platform bus, non-probed device will run its
+ * device-managed actions when unregistered.
+ */
+static void platform_device_devm_register_unregister_test(struct kunit *test)
+{
+	struct platform_device *pdev;
+	struct test_priv *priv = test->priv;
+	int ret;
+
+	pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	ret = platform_device_add(pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	priv->dev = &pdev->dev;
+
+	ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	platform_device_unregister(pdev);
+
+	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+}
+
+/*
+ * Tests that a platform bus, non-probed device will run its
+ * device-managed actions when unregistered, even if someone still holds
+ * a reference to it.
+ */
+static void platform_device_devm_register_get_unregister_with_devm_test(struct kunit *test)
+{
+	struct platform_device *pdev;
+	struct test_priv *priv = test->priv;
+	int ret;
+
+	pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	ret = platform_device_add(pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	priv->dev = &pdev->dev;
+
+	get_device(priv->dev);
+
+	ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	platform_device_unregister(pdev);
+
+	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+}
+
+static int fake_probe(struct platform_device *pdev)
+{
+	struct test_priv *priv = platform_get_drvdata(pdev);
+
+	priv->probe_done = true;
+	wake_up_interruptible(&priv->probe_wq);
+
+	return 0;
+}
+
+static struct platform_driver fake_driver = {
+	.probe	= fake_probe,
+	.driver = {
+		.name = DEVICE_NAME,
+	},
+};
+
+/*
+ * Tests that a platform bus, probed device will run its device-managed
+ * actions when unregistered.
+ */
+static void probed_platform_device_devm_register_unregister_test(struct kunit *test)
+{
+	struct platform_device *pdev;
+	struct test_priv *priv = test->priv;
+	int ret;
+
+	ret = platform_driver_register(&fake_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	priv->dev = &pdev->dev;
+	platform_set_drvdata(pdev, priv);
+
+	ret = platform_device_add(pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	ret = wait_event_interruptible_timeout(priv->probe_wq, priv->probe_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	platform_device_unregister(pdev);
+
+	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+
+	platform_driver_unregister(&fake_driver);
+}
+
+/*
+ * Tests that a platform bus, probed device will run its device-managed
+ * actions when unregistered, even if someone still holds a reference to
+ * it.
+ */
+static void probed_platform_device_devm_register_get_unregister_with_devm_test(struct kunit *test)
+{
+	struct platform_device *pdev;
+	struct test_priv *priv = test->priv;
+	int ret;
+
+	ret = platform_driver_register(&fake_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	priv->dev = &pdev->dev;
+	platform_set_drvdata(pdev, priv);
+
+	ret = platform_device_add(pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	ret = wait_event_interruptible_timeout(priv->probe_wq, priv->probe_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	get_device(priv->dev);
+
+	ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	platform_device_unregister(pdev);
+
+	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+
+	platform_driver_unregister(&fake_driver);
+}
+
+static struct kunit_case platform_device_devm_tests[] = {
+	KUNIT_CASE(platform_device_devm_register_unregister_test),
+	KUNIT_CASE(platform_device_devm_register_get_unregister_with_devm_test),
+	KUNIT_CASE(probed_platform_device_devm_register_unregister_test),
+	KUNIT_CASE(probed_platform_device_devm_register_get_unregister_with_devm_test),
+	{}
+};
+
+static struct kunit_suite platform_device_devm_test_suite = {
+	.name = "platform-device-devm",
+	.init = platform_device_devm_init,
+	.test_cases = platform_device_devm_tests,
+};
+
+static void platform_device_find_by_null_test(struct kunit *test)
+{
+	struct platform_device *pdev;
+	int ret;
+
+	pdev = kunit_platform_device_alloc(test, DEVICE_NAME, PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	ret = kunit_platform_device_add(test, pdev);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_PTR_EQ(test, of_find_device_by_node(NULL), NULL);
+
+	KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_of_node(&platform_bus_type, NULL), NULL);
+	KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_fwnode(&platform_bus_type, NULL), NULL);
+	KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_acpi_dev(&platform_bus_type, NULL), NULL);
+
+	KUNIT_EXPECT_FALSE(test, device_match_of_node(&pdev->dev, NULL));
+	KUNIT_EXPECT_FALSE(test, device_match_fwnode(&pdev->dev, NULL));
+	KUNIT_EXPECT_FALSE(test, device_match_acpi_dev(&pdev->dev, NULL));
+	KUNIT_EXPECT_FALSE(test, device_match_acpi_handle(&pdev->dev, NULL));
+}
+
+static struct kunit_case platform_device_match_tests[] = {
+	KUNIT_CASE(platform_device_find_by_null_test),
+	{}
+};
+
+static struct kunit_suite platform_device_match_test_suite = {
+	.name = "platform-device-match",
+	.test_cases = platform_device_match_tests,
+};
+
+static int platform_device_swnode_test_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver platform_swnode_test_driver = {
+	.probe = platform_device_swnode_test_probe,
+	.driver = {
+		.name = DEVICE_NAME,
+	},
+};
+
+static const struct software_node platform_device_test_swnode = { };
+
+/*
+ * Check that reusing a software node works correctly. If the call to
+ * platform_device_register_full() fails after adding the secondary firmware
+ * node, the software node must be unregistered in the device's release()
+ * callback or the subsequent call to platform_device_register_full() will fail
+ * with -EBUSY due to the software node already having been registered.
+ */
+static void platform_device_swnode_add_twice(struct kunit *test)
+{
+	struct platform_device_info pdevinfo;
+	struct platform_device *pdev;
+	struct fwnode_handle *fwnode;
+	bool bound = false;
+	int ret;
+
+	fwnode = kunit_kzalloc(test, sizeof(*fwnode), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	ret = kunit_platform_driver_register(test, &platform_swnode_test_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	fwnode_init(fwnode, NULL);
+	pdevinfo = (struct platform_device_info){
+		.name = DEVICE_NAME,
+		.id = PLATFORM_DEVID_NONE,
+		.fwnode = fwnode,
+		.swnode = &platform_device_test_swnode,
+	};
+
+	pdev = platform_device_register_full(&pdevinfo);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	wait_for_device_probe();
+	scoped_guard(device, &pdev->dev)
+		bound = device_is_bound(&pdev->dev);
+
+	KUNIT_ASSERT_TRUE(test, bound);
+
+	platform_device_unregister(pdev);
+
+	pdev = platform_device_register_full(&pdevinfo);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	wait_for_device_probe();
+	scoped_guard(device, &pdev->dev)
+		bound = device_is_bound(&pdev->dev);
+
+	KUNIT_ASSERT_TRUE(test, bound);
+
+	platform_device_unregister(pdev);
+}
+
+/*
+ * Check that passing a software node as the primary firmware node of the
+ * platform device does not result in it being unregistered by the call to
+ * device_remove_software_node() in its release path.
+ */
+static void platform_device_swnode_as_primary(struct kunit *test)
+{
+	struct platform_device_info pdevinfo;
+	struct platform_device *pdev;
+	struct fwnode_handle *fwnode;
+	bool bound = false;
+	int ret;
+
+	ret = kunit_platform_driver_register(test, &platform_swnode_test_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	fwnode = kunit_software_node_register(test, &platform_device_test_swnode);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	pdevinfo = (struct platform_device_info){
+		.name = DEVICE_NAME,
+		.id = PLATFORM_DEVID_NONE,
+		.fwnode = fwnode,
+	};
+
+	pdev = platform_device_register_full(&pdevinfo);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+
+	wait_for_device_probe();
+	scoped_guard(device, &pdev->dev)
+		bound = device_is_bound(&pdev->dev);
+
+	KUNIT_ASSERT_TRUE(test, bound);
+
+	platform_device_unregister(pdev);
+
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, software_node_fwnode(&platform_device_test_swnode));
+}
+
+/*
+ * Check that passing two software nodes to platform_device_register_full()
+ * fails.
+ */
+static void platform_device_two_swnodes(struct kunit *test)
+{
+	static const struct property_entry properties[] = {
+		PROPERTY_ENTRY_U32("foo", 42),
+		{ }
+	};
+
+	struct platform_device_info pdevinfo;
+	struct platform_device *pdev;
+	struct fwnode_handle *fwnode;
+	int ret;
+
+	ret = kunit_platform_driver_register(test, &platform_swnode_test_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	fwnode = kunit_software_node_register(test, &platform_device_test_swnode);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	pdevinfo = (struct platform_device_info){
+		.name = DEVICE_NAME,
+		.id = PLATFORM_DEVID_NONE,
+		.fwnode = fwnode,
+		.swnode = &platform_device_test_swnode,
+	};
+
+	pdev = platform_device_register_full(&pdevinfo);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(pdev));
+	KUNIT_ASSERT_EQ_MSG(test, PTR_ERR(pdev), -EINVAL,
+			    "Expected errno == -EINVAL, got: %pe", pdev);
+
+	pdevinfo = (struct platform_device_info){
+		.name = DEVICE_NAME,
+		.id = PLATFORM_DEVID_NONE,
+		.swnode = &platform_device_test_swnode,
+		.properties = properties,
+	};
+
+	pdev = platform_device_register_full(&pdevinfo);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(pdev));
+	KUNIT_ASSERT_EQ_MSG(test, PTR_ERR(pdev), -EINVAL,
+			    "Expected errno == -EINVAL, got: %pe", pdev);
+
+	pdevinfo = (struct platform_device_info){
+		.name = DEVICE_NAME,
+		.id = PLATFORM_DEVID_NONE,
+		.fwnode = fwnode,
+		.properties = properties,
+	};
+
+	pdev = platform_device_register_full(&pdevinfo);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(pdev));
+	KUNIT_ASSERT_EQ_MSG(test, PTR_ERR(pdev), -EINVAL,
+			    "Expected errno == -EINVAL, got: %pe", pdev);
+}
+
+static struct kunit_case platform_device_swnode_tests[] = {
+	KUNIT_CASE(platform_device_swnode_add_twice),
+	KUNIT_CASE(platform_device_swnode_as_primary),
+	KUNIT_CASE(platform_device_two_swnodes),
+	{}
+};
+
+static struct kunit_suite platform_device_swnode_test_suite = {
+	.name = "platform-device-swnode",
+	.test_cases = platform_device_swnode_tests,
+};
+
+kunit_test_suites(
+	&platform_device_devm_test_suite,
+	&platform_device_match_test_suite,
+	&platform_device_swnode_test_suite,
+);
+
+MODULE_DESCRIPTION("Test module for platform devices");
+MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/base/test/property-entry-test.c b/drivers/base/test/property-entry-test.c
new file mode 100644
index 000000000..89cdfc2f8
--- /dev/null
+++ b/drivers/base/test/property-entry-test.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0
+// Unit tests for property entries API
+//
+// Copyright 2019 Google LLC.
+
+#include <kunit/test.h>
+
+#include <linux/of.h>
+#include <linux/property.h>
+#include <linux/types.h>
+
+static void pe_test_uints(struct kunit *test)
+{
+	static const struct property_entry entries[] = {
+		PROPERTY_ENTRY_U8("prop-u8", 8),
+		PROPERTY_ENTRY_U16("prop-u16", 16),
+		PROPERTY_ENTRY_U32("prop-u32", 32),
+		PROPERTY_ENTRY_U64("prop-u64", 64),
+		{ }
+	};
+
+	struct fwnode_handle *node;
+	u8 val_u8, array_u8[2];
+	u16 val_u16, array_u16[2];
+	u32 val_u32, array_u32[2];
+	u64 val_u64, array_u64[2];
+	int error;
+
+	node = fwnode_create_software_node(entries, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, node);
+
+	error = fwnode_property_count_u8(node, "prop-u8");
+	KUNIT_EXPECT_EQ(test, error, 1);
+
+	error = fwnode_property_read_u8(node, "prop-u8", &val_u8);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u8, 8);
+
+	error = fwnode_property_read_u8_array(node, "prop-u8", array_u8, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u8[0], 8);
+
+	error = fwnode_property_read_u8_array(node, "prop-u8", array_u8, 2);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u8(node, "no-prop-u8", &val_u8);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u8_array(node, "no-prop-u8", array_u8, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u16(node, "prop-u16", &val_u16);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u16, 16);
+
+	error = fwnode_property_count_u16(node, "prop-u16");
+	KUNIT_EXPECT_EQ(test, error, 1);
+
+	error = fwnode_property_read_u16_array(node, "prop-u16", array_u16, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u16[0], 16);
+
+	error = fwnode_property_read_u16_array(node, "prop-u16", array_u16, 2);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u16(node, "no-prop-u16", &val_u16);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u16_array(node, "no-prop-u16", array_u16, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u32(node, "prop-u32", &val_u32);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u32, 32);
+
+	error = fwnode_property_count_u32(node, "prop-u32");
+	KUNIT_EXPECT_EQ(test, error, 1);
+
+	error = fwnode_property_read_u32_array(node, "prop-u32", array_u32, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u32[0], 32);
+
+	error = fwnode_property_read_u32_array(node, "prop-u32", array_u32, 2);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u32(node, "no-prop-u32", &val_u32);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u32_array(node, "no-prop-u32", array_u32, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u64(node, "prop-u64", &val_u64);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u64, 64);
+
+	error = fwnode_property_count_u64(node, "prop-u64");
+	KUNIT_EXPECT_EQ(test, error, 1);
+
+	error = fwnode_property_read_u64_array(node, "prop-u64", array_u64, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u64[0], 64);
+
+	error = fwnode_property_read_u64_array(node, "prop-u64", array_u64, 2);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u64(node, "no-prop-u64", &val_u64);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u64_array(node, "no-prop-u64", array_u64, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	/* Count 64-bit values as 16-bit */
+	error = fwnode_property_count_u16(node, "prop-u64");
+	KUNIT_EXPECT_EQ(test, error, 4);
+
+	fwnode_remove_software_node(node);
+}
+
+static void pe_test_uint_arrays(struct kunit *test)
+{
+	static const u8 a_u8[10] = { 8, 9 };
+	static const u16 a_u16[10] = { 16, 17 };
+	static const u32 a_u32[10] = { 32, 33 };
+	static const u64 a_u64[10] = { 64, 65 };
+	static const struct property_entry entries[] = {
+		PROPERTY_ENTRY_U8_ARRAY("prop-u8", a_u8),
+		PROPERTY_ENTRY_U16_ARRAY("prop-u16", a_u16),
+		PROPERTY_ENTRY_U32_ARRAY("prop-u32", a_u32),
+		PROPERTY_ENTRY_U64_ARRAY("prop-u64", a_u64),
+		{ }
+	};
+
+	struct fwnode_handle *node;
+	u8 val_u8, array_u8[32];
+	u16 val_u16, array_u16[32];
+	u32 val_u32, array_u32[32];
+	u64 val_u64, array_u64[32];
+	int error;
+
+	node = fwnode_create_software_node(entries, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, node);
+
+	error = fwnode_property_read_u8(node, "prop-u8", &val_u8);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u8, 8);
+
+	error = fwnode_property_count_u8(node, "prop-u8");
+	KUNIT_EXPECT_EQ(test, error, 10);
+
+	error = fwnode_property_read_u8_array(node, "prop-u8", array_u8, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u8[0], 8);
+
+	error = fwnode_property_read_u8_array(node, "prop-u8", array_u8, 2);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u8[0], 8);
+	KUNIT_EXPECT_EQ(test, array_u8[1], 9);
+
+	error = fwnode_property_read_u8_array(node, "prop-u8", array_u8, 17);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u8(node, "no-prop-u8", &val_u8);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u8_array(node, "no-prop-u8", array_u8, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u16(node, "prop-u16", &val_u16);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u16, 16);
+
+	error = fwnode_property_count_u16(node, "prop-u16");
+	KUNIT_EXPECT_EQ(test, error, 10);
+
+	error = fwnode_property_read_u16_array(node, "prop-u16", array_u16, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u16[0], 16);
+
+	error = fwnode_property_read_u16_array(node, "prop-u16", array_u16, 2);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u16[0], 16);
+	KUNIT_EXPECT_EQ(test, array_u16[1], 17);
+
+	error = fwnode_property_read_u16_array(node, "prop-u16", array_u16, 17);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u16(node, "no-prop-u16", &val_u16);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u16_array(node, "no-prop-u16", array_u16, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u32(node, "prop-u32", &val_u32);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u32, 32);
+
+	error = fwnode_property_count_u32(node, "prop-u32");
+	KUNIT_EXPECT_EQ(test, error, 10);
+
+	error = fwnode_property_read_u32_array(node, "prop-u32", array_u32, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u32[0], 32);
+
+	error = fwnode_property_read_u32_array(node, "prop-u32", array_u32, 2);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u32[0], 32);
+	KUNIT_EXPECT_EQ(test, array_u32[1], 33);
+
+	error = fwnode_property_read_u32_array(node, "prop-u32", array_u32, 17);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u32(node, "no-prop-u32", &val_u32);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u32_array(node, "no-prop-u32", array_u32, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u64(node, "prop-u64", &val_u64);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, val_u64, 64);
+
+	error = fwnode_property_count_u64(node, "prop-u64");
+	KUNIT_EXPECT_EQ(test, error, 10);
+
+	error = fwnode_property_read_u64_array(node, "prop-u64", array_u64, 1);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u64[0], 64);
+
+	error = fwnode_property_read_u64_array(node, "prop-u64", array_u64, 2);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_EQ(test, array_u64[0], 64);
+	KUNIT_EXPECT_EQ(test, array_u64[1], 65);
+
+	error = fwnode_property_read_u64_array(node, "prop-u64", array_u64, 17);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u64(node, "no-prop-u64", &val_u64);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_u64_array(node, "no-prop-u64", array_u64, 1);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	/* Count 64-bit values as 16-bit */
+	error = fwnode_property_count_u16(node, "prop-u64");
+	KUNIT_EXPECT_EQ(test, error, 40);
+
+	/* Other way around */
+	error = fwnode_property_count_u64(node, "prop-u16");
+	KUNIT_EXPECT_EQ(test, error, 2);
+
+	fwnode_remove_software_node(node);
+}
+
+static void pe_test_strings(struct kunit *test)
+{
+	static const char *strings[] = {
+		"string-a",
+		"string-b",
+	};
+
+	static const struct property_entry entries[] = {
+		PROPERTY_ENTRY_STRING("str", "single"),
+		PROPERTY_ENTRY_STRING("empty", ""),
+		PROPERTY_ENTRY_STRING_ARRAY("strs", strings),
+		{ }
+	};
+
+	struct fwnode_handle *node;
+	const char *str;
+	const char *strs[10];
+	int error;
+
+	node = fwnode_create_software_node(entries, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, node);
+
+	error = fwnode_property_read_string(node, "str", &str);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_STREQ(test, str, "single");
+
+	error = fwnode_property_string_array_count(node, "str");
+	KUNIT_EXPECT_EQ(test, error, 1);
+
+	error = fwnode_property_read_string_array(node, "str", strs, 1);
+	KUNIT_EXPECT_EQ(test, error, 1);
+	KUNIT_EXPECT_STREQ(test, strs[0], "single");
+
+	/* asking for more data returns what we have */
+	error = fwnode_property_read_string_array(node, "str", strs, 2);
+	KUNIT_EXPECT_EQ(test, error, 1);
+	KUNIT_EXPECT_STREQ(test, strs[0], "single");
+
+	error = fwnode_property_read_string(node, "no-str", &str);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_read_string_array(node, "no-str", strs, 1);
+	KUNIT_EXPECT_LT(test, error, 0);
+
+	error = fwnode_property_read_string(node, "empty", &str);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_STREQ(test, str, "");
+
+	error = fwnode_property_string_array_count(node, "strs");
+	KUNIT_EXPECT_EQ(test, error, 2);
+
+	error = fwnode_property_read_string_array(node, "strs", strs, 3);
+	KUNIT_EXPECT_EQ(test, error, 2);
+	KUNIT_EXPECT_STREQ(test, strs[0], "string-a");
+	KUNIT_EXPECT_STREQ(test, strs[1], "string-b");
+
+	error = fwnode_property_read_string_array(node, "strs", strs, 1);
+	KUNIT_EXPECT_EQ(test, error, 1);
+	KUNIT_EXPECT_STREQ(test, strs[0], "string-a");
+
+	/* NULL argument -> returns size */
+	error = fwnode_property_read_string_array(node, "strs", NULL, 0);
+	KUNIT_EXPECT_EQ(test, error, 2);
+
+	/* accessing array as single value */
+	error = fwnode_property_read_string(node, "strs", &str);
+	KUNIT_EXPECT_EQ(test, error, 0);
+	KUNIT_EXPECT_STREQ(test, str, "string-a");
+
+	fwnode_remove_software_node(node);
+}
+
+static void pe_test_bool(struct kunit *test)
+{
+	static const struct property_entry entries[] = {
+		PROPERTY_ENTRY_BOOL("prop"),
+		{ }
+	};
+
+	struct fwnode_handle *node;
+
+	node = fwnode_create_software_node(entries, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, node);
+
+	KUNIT_EXPECT_TRUE(test, fwnode_property_read_bool(node, "prop"));
+	KUNIT_EXPECT_FALSE(test, fwnode_property_read_bool(node, "not-prop"));
+
+	fwnode_remove_software_node(node);
+}
+
+/* Verifies that small U8 array is stored inline when property is copied */
+static void pe_test_move_inline_u8(struct kunit *test)
+{
+	static const u8 u8_array_small[8] = { 1, 2, 3, 4 };
+	static const u8 u8_array_big[128] = { 5, 6, 7, 8 };
+	static const struct property_entry entries[] = {
+		PROPERTY_ENTRY_U8_ARRAY("small", u8_array_small),
+		PROPERTY_ENTRY_U8_ARRAY("big", u8_array_big),
+		{ }
+	};
+
+	struct property_entry *copy;
+	const u8 *data_ptr;
+
+	copy = property_entries_dup(entries);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, copy);
+
+	KUNIT_EXPECT_TRUE(test, copy[0].is_inline);
+	data_ptr = (u8 *)&copy[0].value;
+	KUNIT_EXPECT_EQ(test, data_ptr[0], 1);
+	KUNIT_EXPECT_EQ(test, data_ptr[1], 2);
+
+	KUNIT_EXPECT_FALSE(test, copy[1].is_inline);
+	data_ptr = copy[1].pointer;
+	KUNIT_EXPECT_EQ(test, data_ptr[0], 5);
+	KUNIT_EXPECT_EQ(test, data_ptr[1], 6);
+
+	property_entries_free(copy);
+}
+
+/* Verifies that single string array is stored inline when property is copied */
+static void pe_test_move_inline_str(struct kunit *test)
+{
+	static char *str_array_small[] = { "a" };
+	static char *str_array_big[] = { "b", "c", "d", "e" };
+	static char *str_array_small_empty[] = { "" };
+	static struct property_entry entries[] = {
+		PROPERTY_ENTRY_STRING_ARRAY("small", str_array_small),
+		PROPERTY_ENTRY_STRING_ARRAY("big", str_array_big),
+		PROPERTY_ENTRY_STRING_ARRAY("small-empty", str_array_small_empty),
+		{ }
+	};
+
+	struct property_entry *copy;
+	const char * const *data_ptr;
+
+	copy = property_entries_dup(entries);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, copy);
+
+	KUNIT_EXPECT_TRUE(test, copy[0].is_inline);
+	KUNIT_EXPECT_STREQ(test, copy[0].value.str[0], "a");
+
+	KUNIT_EXPECT_FALSE(test, copy[1].is_inline);
+	data_ptr = copy[1].pointer;
+	KUNIT_EXPECT_STREQ(test, data_ptr[0], "b");
+	KUNIT_EXPECT_STREQ(test, data_ptr[1], "c");
+
+	KUNIT_EXPECT_TRUE(test, copy[2].is_inline);
+	KUNIT_EXPECT_STREQ(test, copy[2].value.str[0], "");
+
+	property_entries_free(copy);
+}
+
+/* Handling of reference properties */
+static void pe_test_reference(struct kunit *test)
+{
+	static const struct software_node node1 = { .name = "1" };
+	static const struct software_node node2 = { .name = "2" };
+	static const struct software_node *group[] = { &node1, &node2, NULL };
+
+	static const struct software_node_ref_args refs[] = {
+		SOFTWARE_NODE_REFERENCE(&node1),
+		SOFTWARE_NODE_REFERENCE(&node2, 3, 4),
+	};
+
+	const struct property_entry entries[] = {
+		PROPERTY_ENTRY_REF("ref-1", &node1),
+		PROPERTY_ENTRY_REF("ref-2", &node2, 1, 2),
+		PROPERTY_ENTRY_REF_ARRAY("ref-3", refs),
+		{ }
+	};
+
+	struct fwnode_handle *node;
+	struct fwnode_reference_args ref;
+	int error;
+
+	error = software_node_register_node_group(group);
+	KUNIT_ASSERT_EQ(test, error, 0);
+
+	node = fwnode_create_software_node(entries, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, node);
+
+	error = fwnode_property_get_reference_args(node, "ref-1", NULL,
+						   0, 0, &ref);
+	KUNIT_ASSERT_EQ(test, error, 0);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node1);
+	KUNIT_EXPECT_EQ(test, ref.nargs, 0U);
+
+	/* wrong index */
+	error = fwnode_property_get_reference_args(node, "ref-1", NULL,
+						   0, 1, &ref);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	error = fwnode_property_get_reference_args(node, "ref-2", NULL,
+						   1, 0, &ref);
+	KUNIT_ASSERT_EQ(test, error, 0);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node2);
+	KUNIT_EXPECT_EQ(test, ref.nargs, 1U);
+	KUNIT_EXPECT_EQ(test, ref.args[0], 1LLU);
+
+	/* asking for more args, padded with zero data */
+	error = fwnode_property_get_reference_args(node, "ref-2", NULL,
+						   3, 0, &ref);
+	KUNIT_ASSERT_EQ(test, error, 0);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node2);
+	KUNIT_EXPECT_EQ(test, ref.nargs, 3U);
+	KUNIT_EXPECT_EQ(test, ref.args[0], 1LLU);
+	KUNIT_EXPECT_EQ(test, ref.args[1], 2LLU);
+	KUNIT_EXPECT_EQ(test, ref.args[2], 0LLU);
+
+	/* wrong index */
+	error = fwnode_property_get_reference_args(node, "ref-2", NULL,
+						   2, 1, &ref);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	/* array of references */
+	error = fwnode_property_get_reference_args(node, "ref-3", NULL,
+						   0, 0, &ref);
+	KUNIT_ASSERT_EQ(test, error, 0);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node1);
+	KUNIT_EXPECT_EQ(test, ref.nargs, 0U);
+
+	/* second reference in the array */
+	error = fwnode_property_get_reference_args(node, "ref-3", NULL,
+						   2, 1, &ref);
+	KUNIT_ASSERT_EQ(test, error, 0);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node2);
+	KUNIT_EXPECT_EQ(test, ref.nargs, 2U);
+	KUNIT_EXPECT_EQ(test, ref.args[0], 3LLU);
+	KUNIT_EXPECT_EQ(test, ref.args[1], 4LLU);
+
+	/* wrong index */
+	error = fwnode_property_get_reference_args(node, "ref-1", NULL,
+						   0, 2, &ref);
+	KUNIT_EXPECT_NE(test, error, 0);
+
+	fwnode_remove_software_node(node);
+	software_node_unregister_node_group(group);
+}
+
+static struct fwnode_handle *create_device_node(struct kunit *test,
+						const char *name,
+						const char *full_name,
+						struct device_node *parent)
+{
+	struct device_node *node;
+
+	node = kunit_kzalloc(test, sizeof(*node), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, node);
+
+	node->name = kunit_kstrdup(test, name, GFP_KERNEL);
+	node->full_name = kunit_kstrdup(test, full_name, GFP_KERNEL);
+
+	if (parent) {
+		node->sibling = parent->child;
+		/* set the node as the first child of the parent */
+		parent->child = node;
+		node->parent = parent;
+	}
+
+	of_node_init(node);
+	return of_fwnode_handle(node);
+}
+
+/* Verifies that fwnode_for_each_child_node() can output correct children */
+static void pe_test_child_iteration(struct kunit *test)
+{
+	struct fwnode_handle *of_node, *of_node1;
+	struct fwnode_handle *sw_node, *sw_node1;
+	struct fwnode_handle *child;
+	int error, i, num;
+
+	if (!IS_ENABLED(CONFIG_OF))
+		kunit_skip(test, "requires CONFIG_OF");
+
+	static const struct software_node node = { .name = "sw" };
+	static const struct software_node node1 = { .name = "sw-1", .parent = &node};
+	static const struct software_node node2 = { .name = "sw-2", .parent = &node};
+	static const struct software_node node3 = { .name = "sw-3", .parent = &node};
+	static const struct software_node *group[] = { &node, &node1, &node2, &node3, NULL };
+
+	static const char * const of_child_array[] = { "of-1", "of-2", "of-3" };
+	static const char * const sw_child_array[] = { "sw-1", "sw-2", "sw-3" };
+	static const char * const of_sw_child_array[] = { "of-1", "of-2", "of-3",
+							  "sw-1", "sw-2", "sw-3" };
+	static const char * const sw_of_child_array[] = { "sw-1", "sw-2", "sw-3",
+							  "of-1", "of-2", "of-3" };
+
+	/* 1. Test OF node child iteration */
+
+	of_node = create_device_node(test, "of", "of", NULL);
+	create_device_node(test, "of", "of-3", to_of_node(of_node));
+	create_device_node(test, "of", "of-2", to_of_node(of_node));
+	of_node1 = create_device_node(test, "of", "of-1", to_of_node(of_node));
+
+	i = 0;
+	num = ARRAY_SIZE(of_child_array);
+	fwnode_for_each_child_node(of_node, child) {
+		KUNIT_ASSERT_LT(test, i, num);
+		KUNIT_EXPECT_STREQ(test, of_child_array[i++], fwnode_get_name(child));
+	}
+	KUNIT_EXPECT_PTR_EQ(test, child, NULL);
+
+	/* 2. Test SW node child iteration */
+
+	error = software_node_register_node_group(group);
+	KUNIT_ASSERT_EQ(test, error, 0);
+
+	sw_node = software_node_fwnode(&node);
+
+	i = 0;
+	num = ARRAY_SIZE(sw_child_array);
+	fwnode_for_each_child_node(sw_node, child) {
+		KUNIT_ASSERT_LT(test, i, num);
+		KUNIT_EXPECT_STREQ(test, sw_child_array[i++], fwnode_get_name(child));
+	}
+	KUNIT_EXPECT_PTR_EQ(test, child, NULL);
+
+	/* 3. Test OF (primary) + SW (secondary) node child iteration */
+
+	of_node->secondary = sw_node;
+	sw_node->secondary = ERR_PTR(-ENODEV);
+
+	i = 0;
+	num = ARRAY_SIZE(of_sw_child_array);
+	fwnode_for_each_child_node(of_node, child) {
+		KUNIT_ASSERT_LT(test, i, num);
+		KUNIT_EXPECT_STREQ(test, of_sw_child_array[i++], fwnode_get_name(child));
+	}
+	KUNIT_EXPECT_PTR_EQ(test, child, NULL);
+
+	/* 4. Test SW (primary) + OF (secondary) node child iteration */
+
+	sw_node->secondary = of_node;
+	of_node->secondary = ERR_PTR(-ENODEV);
+
+	i = 0;
+	num = ARRAY_SIZE(sw_of_child_array);
+	fwnode_for_each_child_node(sw_node, child) {
+		KUNIT_ASSERT_LT(test, i, num);
+		KUNIT_EXPECT_STREQ(test, sw_of_child_array[i++], fwnode_get_name(child));
+	}
+	KUNIT_EXPECT_PTR_EQ(test, child, NULL);
+
+	/* 5. Test OF (primary) + SW (secondary, but no children) node child iteration */
+
+	sw_node1 = software_node_fwnode(&node1);
+	of_node->secondary = sw_node1;
+	sw_node->secondary = ERR_PTR(-ENODEV);
+
+	i = 0;
+	num = ARRAY_SIZE(of_child_array);
+	fwnode_for_each_child_node(of_node, child) {
+		KUNIT_ASSERT_LT(test, i, num);
+		KUNIT_EXPECT_STREQ(test, of_child_array[i++], fwnode_get_name(child));
+	}
+	KUNIT_EXPECT_PTR_EQ(test, child, NULL);
+
+	/* 6. Test SW (primary) + OF (secondary, but no children) node child iteration */
+
+	sw_node->secondary = of_node1;
+	of_node->secondary = ERR_PTR(-ENODEV);
+
+	i = 0;
+	num = ARRAY_SIZE(sw_child_array);
+	fwnode_for_each_child_node(sw_node, child) {
+		KUNIT_ASSERT_LT(test, i, num);
+		KUNIT_EXPECT_STREQ(test, sw_child_array[i++], fwnode_get_name(child));
+	}
+	KUNIT_EXPECT_PTR_EQ(test, child, NULL);
+
+	of_node->secondary = NULL;
+	sw_node->secondary = NULL;
+	software_node_unregister_node_group(group);
+}
+
+static struct kunit_case property_entry_test_cases[] = {
+	KUNIT_CASE(pe_test_uints),
+	KUNIT_CASE(pe_test_uint_arrays),
+	KUNIT_CASE(pe_test_strings),
+	KUNIT_CASE(pe_test_bool),
+	KUNIT_CASE(pe_test_move_inline_u8),
+	KUNIT_CASE(pe_test_move_inline_str),
+	KUNIT_CASE(pe_test_reference),
+	KUNIT_CASE(pe_test_child_iteration),
+	{ }
+};
+
+static struct kunit_suite property_entry_test_suite = {
+	.name = "property-entry",
+	.test_cases = property_entry_test_cases,
+};
+
+kunit_test_suite(property_entry_test_suite);
+
+MODULE_DESCRIPTION("Test module for the property entry API");
+MODULE_AUTHOR("Dmitry Torokhov <dtor@chromium.org>");
+MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");
+MODULE_LICENSE("GPL");
diff --git a/drivers/base/test/root-device-test.c b/drivers/base/test/root-device-test.c
new file mode 100644
index 000000000..9aea23c91
--- /dev/null
+++ b/drivers/base/test/root-device-test.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright 2023 Maxime Ripard <mripard@kernel.org>
+
+#include <kunit/resource.h>
+
+#include <linux/device.h>
+
+#define DEVICE_NAME "test"
+
+struct test_priv {
+	bool probe_done;
+	bool release_done;
+	wait_queue_head_t release_wq;
+	struct device *dev;
+};
+
+static int root_device_devm_init(struct kunit *test)
+{
+	struct test_priv *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+	init_waitqueue_head(&priv->release_wq);
+
+	test->priv = priv;
+
+	return 0;
+}
+
+static void devm_device_action(void *ptr)
+{
+	struct test_priv *priv = ptr;
+
+	priv->release_done = true;
+	wake_up_interruptible(&priv->release_wq);
+}
+
+#define RELEASE_TIMEOUT_MS	100
+
+/*
+ * Tests that a bus-less, non-probed device will run its device-managed
+ * actions when unregistered.
+ */
+static void root_device_devm_register_unregister_test(struct kunit *test)
+{
+	struct test_priv *priv = test->priv;
+	int ret;
+
+	priv->dev = root_device_register(DEVICE_NAME);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
+
+	ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	root_device_unregister(priv->dev);
+
+	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+}
+
+static void devm_put_device_action(void *ptr)
+{
+	struct test_priv *priv = ptr;
+
+	put_device(priv->dev);
+	priv->release_done = true;
+	wake_up_interruptible(&priv->release_wq);
+}
+
+/*
+ * Tests that a bus-less, non-probed device will run its device-managed
+ * actions when unregistered, even if someone still holds a reference to
+ * it.
+ */
+static void root_device_devm_register_get_unregister_with_devm_test(struct kunit *test)
+{
+	struct test_priv *priv = test->priv;
+	int ret;
+
+	priv->dev = root_device_register(DEVICE_NAME);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
+
+	get_device(priv->dev);
+
+	ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	root_device_unregister(priv->dev);
+
+	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
+					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+}
+
+static struct kunit_case root_device_devm_tests[] = {
+	KUNIT_CASE(root_device_devm_register_unregister_test),
+	KUNIT_CASE(root_device_devm_register_get_unregister_with_devm_test),
+	{}
+};
+
+static struct kunit_suite root_device_devm_test_suite = {
+	.name = "root-device-devm",
+	.init = root_device_devm_init,
+	.test_cases = root_device_devm_tests,
+};
+
+kunit_test_suite(root_device_devm_test_suite);
+
+MODULE_DESCRIPTION("Test module for root devices");
+MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/base/test/swnode-devlink-test.c b/drivers/base/test/swnode-devlink-test.c
new file mode 100644
index 000000000..f53549e92
--- /dev/null
+++ b/drivers/base/test/swnode-devlink-test.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) Qualcomm Technologies, Inc. and/or its subsidiaries
+ */
+
+#include <linux/array_size.h>
+#include <linux/device.h>
+#include <linux/fwnode.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+
+#include <kunit/fwnode.h>
+#include <kunit/platform_device.h>
+#include <kunit/test.h>
+
+static int swnode_count_suppliers(struct fwnode_handle *fwnode)
+{
+	struct fwnode_link *link;
+	unsigned int count = 0;
+
+	/*
+	 * The suppliers and consumers lists should typically only be accessed
+	 * with the fwnode_link_lock taken but it's private to the driver core.
+	 *
+	 * These are tests and at this point nobody should be modifying them so
+	 * let's just access the list.
+	 */
+	list_for_each_entry(link, &fwnode->suppliers, c_hook)
+		count++;
+
+	return count;
+}
+
+/* True if a supplier link con->sup exists, checked from both list ends. */
+static bool swnode_has_link(struct fwnode_handle *consumer,
+			    struct fwnode_handle *supplier)
+{
+	bool from_con = false, from_sup = false;
+	struct fwnode_link *link;
+
+	list_for_each_entry(link, &consumer->suppliers, c_hook) {
+		if (link->supplier == supplier && link->consumer == consumer)
+			from_con = true;
+	}
+
+	list_for_each_entry(link, &supplier->consumers, s_hook) {
+		if (link->supplier == supplier && link->consumer == consumer)
+			from_sup = true;
+	}
+
+	return from_con && from_sup;
+}
+
+/* A single reference creates exactly one supplier link, on both list ends. */
+static void swnode_devlink_test_single_ref(struct kunit *test)
+{
+	static const struct software_node supp_swnode = {
+		.name = "swnode-devlink-test-supplier",
+	};
+
+	struct fwnode_handle *cons_fwnode, *supp_fwnode;
+	int ret;
+
+	const struct property_entry props[] = {
+		PROPERTY_ENTRY_REF("supplier", &supp_swnode),
+		{ }
+	};
+
+	supp_fwnode = kunit_software_node_register(test, &supp_swnode);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, supp_fwnode);
+
+	cons_fwnode = kunit_fwnode_create_software_node(test, props, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cons_fwnode);
+
+	ret = fwnode_call_int_op(cons_fwnode, add_links);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, swnode_count_suppliers(cons_fwnode), 1);
+	KUNIT_EXPECT_TRUE(test, swnode_has_link(cons_fwnode, supp_fwnode));
+}
+
+/* Multiple distinct references create multiple supplier links. */
+static void swnode_devlink_test_multiple_refs(struct kunit *test)
+{
+	static const struct software_node supp1_swnode = {
+		.name = "swnode-devlink-test-supplier-1",
+	};
+	static const struct software_node supp2_swnode = {
+		.name = "swnode-devlink-test-supplier-2",
+	};
+	static const struct software_node *supp_nodes[] = {
+		&supp1_swnode, &supp2_swnode, NULL
+	};
+
+	const struct property_entry props[] = {
+		PROPERTY_ENTRY_REF("foo", &supp1_swnode),
+		PROPERTY_ENTRY_REF("bar", &supp2_swnode),
+		{ }
+	};
+
+	struct fwnode_handle *fwnode;
+	int ret;
+
+	ret = kunit_software_node_register_node_group(test, supp_nodes);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	fwnode = kunit_fwnode_create_software_node(test, props, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	ret = fwnode_call_int_op(fwnode, add_links);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, swnode_count_suppliers(fwnode), 2);
+	KUNIT_EXPECT_TRUE(test, swnode_has_link(fwnode, software_node_fwnode(&supp1_swnode)));
+	KUNIT_EXPECT_TRUE(test, swnode_has_link(fwnode, software_node_fwnode(&supp2_swnode)));
+}
+
+/* A reference to an unregistered node creates no link (graceful skip). */
+static void swnode_devlink_test_unregistered_ref(struct kunit *test)
+{
+	static const struct software_node supp_swnode = {
+		.name = "swnode-devlink-test-supplier",
+	};
+
+	const struct property_entry props[] = {
+		PROPERTY_ENTRY_REF("supplier", &supp_swnode),
+		{ }
+	};
+
+	struct fwnode_handle *fwnode;
+	int ret;
+
+	fwnode = kunit_fwnode_create_software_node(test, props, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	ret = fwnode_call_int_op(fwnode, add_links);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	KUNIT_EXPECT_EQ(test, swnode_count_suppliers(fwnode), 0);
+}
+
+/* Graph "remote-endpoint" references are excluded. */
+static void swnode_devlink_test_remote_endpoint_excluded(struct kunit *test)
+{
+	static const struct software_node ep_swnode = {
+		.name = "swnode-devlink-test-end-point"
+	};
+
+	const struct property_entry props[] = {
+		PROPERTY_ENTRY_REF("remote-endpoint", &ep_swnode),
+		{ }
+	};
+
+	struct fwnode_handle *cons_fwnode, *supp_fwnode;
+	int ret;
+
+	supp_fwnode = kunit_software_node_register(test, &ep_swnode);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, supp_fwnode);
+
+	cons_fwnode = kunit_fwnode_create_software_node(test, props, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cons_fwnode);
+
+	ret = fwnode_call_int_op(cons_fwnode, add_links);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	KUNIT_EXPECT_EQ(test, swnode_count_suppliers(cons_fwnode), 0);
+}
+
+/* A reference array creates one link per registered element. */
+static void swnode_devlink_test_ref_array(struct kunit *test)
+{
+	static const struct software_node supp1_swnode = {
+		.name = "swnode-devlink-test-supplier-1",
+	};
+	static const struct software_node supp2_swnode = {
+		.name = "swnode-devlink-test-supplier-2",
+	};
+	static const struct software_node *supp_nodes[] = {
+		&supp1_swnode, &supp2_swnode, NULL
+	};
+	static const struct software_node_ref_args refs[] = {
+		SOFTWARE_NODE_REFERENCE(&supp1_swnode),
+		SOFTWARE_NODE_REFERENCE(&supp2_swnode, 4, 2),
+	};
+
+	const struct property_entry props[] = {
+		PROPERTY_ENTRY_REF_ARRAY("suppliers", refs),
+		{ }
+	};
+
+	struct fwnode_handle *fwnode;
+	int ret;
+
+	ret = kunit_software_node_register_node_group(test, supp_nodes);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	fwnode = kunit_fwnode_create_software_node(test, props, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	ret = fwnode_call_int_op(fwnode, add_links);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, swnode_count_suppliers(fwnode), 2);
+	KUNIT_EXPECT_TRUE(test, swnode_has_link(fwnode, software_node_fwnode(&supp1_swnode)));
+	KUNIT_EXPECT_TRUE(test, swnode_has_link(fwnode, software_node_fwnode(&supp2_swnode)));
+}
+
+/*
+ * End-to-end test: fw_devlink must defer a consumer's probe until its
+ * supplier has probed.
+ *
+ * The reference created by software_node_add_links() is only useful if the
+ * driver core promotes it to a real device_link and uses it to order probing.
+ * This test drives actual probing through the platform bus and asserts the
+ * supplier binds before the consumer.
+ */
+
+#define SWNODE_DEVLINK_TEST_SUPPLIER	"swnode-link-supplier"
+#define SWNODE_DEVLINK_TEST_CONSUMER	"swnode-link-consumer"
+#define SWNODE_DEVLINK_TEST_TIMEOUT_MS	(2 * MSEC_PER_SEC)
+
+struct swnode_test_probe_order {
+	/* Names in the order their drivers' .probe ran. */
+	const char *probed[2];
+	unsigned int count;
+	wait_queue_head_t wq;
+};
+
+static int swnode_test_record_probe(struct platform_device *pdev)
+{
+	struct swnode_test_probe_order *order = platform_get_drvdata(pdev);
+
+	if (order && order->count < ARRAY_SIZE(order->probed)) {
+		order->probed[order->count++] = dev_name(&pdev->dev);
+		wake_up_interruptible(&order->wq);
+	}
+
+	return 0;
+}
+
+static struct platform_driver swnode_test_supplier_driver = {
+	.probe = swnode_test_record_probe,
+	.driver = {
+		.name = SWNODE_DEVLINK_TEST_SUPPLIER,
+	},
+};
+
+static struct platform_driver swnode_test_consumer_driver = {
+	.probe = swnode_test_record_probe,
+	.driver = {
+		.name = SWNODE_DEVLINK_TEST_CONSUMER,
+	},
+};
+
+static void swnode_devlink_test_probe_order(struct kunit *test)
+{
+	static const struct software_node supplier_swnode = {
+		.name = "swnode-devlink-test-supplier",
+	};
+
+	const struct property_entry consumer_props[] = {
+		PROPERTY_ENTRY_REF("supplier-ref", &supplier_swnode),
+		{ }
+	};
+
+	struct platform_device *supplier, *consumer;
+	struct swnode_test_probe_order *order;
+	struct fwnode_handle *fwnode;
+	int ret;
+
+	order = kunit_kzalloc(test, sizeof(*order), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, order);
+	init_waitqueue_head(&order->wq);
+
+	fwnode = kunit_software_node_register(test, &supplier_swnode);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fwnode);
+
+	ret = kunit_platform_driver_register(test, &swnode_test_supplier_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+	ret = kunit_platform_driver_register(test, &swnode_test_consumer_driver);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	supplier = kunit_platform_device_alloc(test, SWNODE_DEVLINK_TEST_SUPPLIER,
+					       PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, supplier);
+	consumer = kunit_platform_device_alloc(test, SWNODE_DEVLINK_TEST_CONSUMER,
+					       PLATFORM_DEVID_NONE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, consumer);
+
+	platform_set_drvdata(supplier, order);
+	platform_set_drvdata(consumer, order);
+
+	ret = kunit_device_add_software_node(test, &supplier->dev, &supplier_swnode);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+	ret = device_create_managed_software_node(&consumer->dev,
+						  consumer_props, NULL);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	ret = kunit_platform_device_add(test, consumer);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+	ret = kunit_platform_device_add(test, supplier);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	ret = wait_event_interruptible_timeout(order->wq,
+					       order->count == 2,
+					       msecs_to_jiffies(SWNODE_DEVLINK_TEST_TIMEOUT_MS));
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	KUNIT_EXPECT_STREQ(test, order->probed[0], SWNODE_DEVLINK_TEST_SUPPLIER);
+	KUNIT_EXPECT_STREQ(test, order->probed[1], SWNODE_DEVLINK_TEST_CONSUMER);
+
+	/* Tear down the consumer (and its device link) before the supplier. */
+	kunit_platform_device_unregister(test, consumer);
+}
+
+static struct kunit_case swnode_test_cases[] = {
+	KUNIT_CASE(swnode_devlink_test_single_ref),
+	KUNIT_CASE(swnode_devlink_test_multiple_refs),
+	KUNIT_CASE(swnode_devlink_test_unregistered_ref),
+	KUNIT_CASE(swnode_devlink_test_remote_endpoint_excluded),
+	KUNIT_CASE(swnode_devlink_test_ref_array),
+	KUNIT_CASE(swnode_devlink_test_probe_order),
+	{ }
+};
+
+static struct kunit_suite swnode_test_suite = {
+	.name = "software-node-links",
+	.test_cases = swnode_test_cases,
+};
+
+kunit_test_suite(swnode_test_suite);
+
+MODULE_DESCRIPTION("Test module for software node fw_devlink support");
+MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/base/test/test_async_driver_probe.c b/drivers/base/test/test_async_driver_probe.c
new file mode 100644
index 000000000..3465800ba
--- /dev/null
+++ b/drivers/base/test/test_async_driver_probe.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2014 Google, Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/hrtimer.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/time.h>
+#include <linux/numa.h>
+#include <linux/nodemask.h>
+#include <linux/topology.h>
+
+#define TEST_PROBE_DELAY	(5 * 1000)	/* 5 sec */
+#define TEST_PROBE_THRESHOLD	(TEST_PROBE_DELAY / 2)
+
+static atomic_t warnings, errors, timeout, async_completed;
+
+static int test_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	/*
+	 * Determine if we have hit the "timeout" limit for the test if we
+	 * have then report it as an error, otherwise we wil sleep for the
+	 * required amount of time and then report completion.
+	 */
+	if (atomic_read(&timeout)) {
+		dev_err(dev, "async probe took too long\n");
+		atomic_inc(&errors);
+	} else {
+		dev_dbg(&pdev->dev, "sleeping for %d msecs in probe\n",
+			 TEST_PROBE_DELAY);
+		msleep(TEST_PROBE_DELAY);
+		dev_dbg(&pdev->dev, "done sleeping\n");
+	}
+
+	/*
+	 * Report NUMA mismatch if device node is set and we are not
+	 * performing an async init on that node.
+	 */
+	if (dev->driver->probe_type == PROBE_PREFER_ASYNCHRONOUS) {
+		if (IS_ENABLED(CONFIG_NUMA) &&
+		    dev_to_node(dev) != numa_node_id()) {
+			dev_warn(dev, "NUMA node mismatch %d != %d\n",
+				 dev_to_node(dev), numa_node_id());
+			atomic_inc(&warnings);
+		}
+
+		atomic_inc(&async_completed);
+	}
+
+	return 0;
+}
+
+static struct platform_driver async_driver = {
+	.driver = {
+		.name = "test_async_driver",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+	.probe = test_probe,
+};
+
+static struct platform_driver sync_driver = {
+	.driver = {
+		.name = "test_sync_driver",
+		.probe_type = PROBE_FORCE_SYNCHRONOUS,
+	},
+	.probe = test_probe,
+};
+
+static struct platform_device *async_dev[NR_CPUS * 2];
+static struct platform_device *sync_dev[2];
+
+static struct platform_device *
+test_platform_device_register_node(char *name, int id, int nid)
+{
+	struct platform_device *pdev;
+	int ret;
+
+	pdev = platform_device_alloc(name, id);
+	if (!pdev)
+		return ERR_PTR(-ENOMEM);
+
+	if (nid != NUMA_NO_NODE)
+		set_dev_node(&pdev->dev, nid);
+
+	ret = platform_device_add(pdev);
+	if (ret) {
+		platform_device_put(pdev);
+		return ERR_PTR(ret);
+	}
+
+	return pdev;
+
+}
+
+static int __init test_async_probe_init(void)
+{
+	struct platform_device **pdev = NULL;
+	int async_id = 0, sync_id = 0;
+	unsigned long long duration;
+	ktime_t calltime;
+	int err, nid, cpu;
+
+	pr_info("registering first set of asynchronous devices...\n");
+
+	for_each_online_cpu(cpu) {
+		nid = cpu_to_node(cpu);
+		pdev = &async_dev[async_id];
+		*pdev =	test_platform_device_register_node("test_async_driver",
+							   async_id,
+							   nid);
+		if (IS_ERR(*pdev)) {
+			err = PTR_ERR(*pdev);
+			*pdev = NULL;
+			pr_err("failed to create async_dev: %d\n", err);
+			goto err_unregister_async_devs;
+		}
+
+		async_id++;
+	}
+
+	pr_info("registering asynchronous driver...\n");
+	calltime = ktime_get();
+	err = platform_driver_register(&async_driver);
+	if (err) {
+		pr_err("Failed to register async_driver: %d\n", err);
+		goto err_unregister_async_devs;
+	}
+
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
+	pr_info("registration took %lld msecs\n", duration);
+	if (duration > TEST_PROBE_THRESHOLD) {
+		pr_err("test failed: probe took too long\n");
+		err = -ETIMEDOUT;
+		goto err_unregister_async_driver;
+	}
+
+	pr_info("registering second set of asynchronous devices...\n");
+	calltime = ktime_get();
+	for_each_online_cpu(cpu) {
+		nid = cpu_to_node(cpu);
+		pdev = &async_dev[async_id];
+
+		*pdev = test_platform_device_register_node("test_async_driver",
+							   async_id,
+							   nid);
+		if (IS_ERR(*pdev)) {
+			err = PTR_ERR(*pdev);
+			*pdev = NULL;
+			pr_err("failed to create async_dev: %d\n", err);
+			goto err_unregister_async_driver;
+		}
+
+		async_id++;
+	}
+
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
+	dev_info(&(*pdev)->dev,
+		 "registration took %lld msecs\n", duration);
+	if (duration > TEST_PROBE_THRESHOLD) {
+		dev_err(&(*pdev)->dev,
+			"test failed: probe took too long\n");
+		err = -ETIMEDOUT;
+		goto err_unregister_async_driver;
+	}
+
+
+	pr_info("registering first synchronous device...\n");
+	nid = cpu_to_node(cpu);
+	pdev = &sync_dev[sync_id];
+
+	*pdev = test_platform_device_register_node("test_sync_driver",
+						   sync_id,
+						   NUMA_NO_NODE);
+	if (IS_ERR(*pdev)) {
+		err = PTR_ERR(*pdev);
+		*pdev = NULL;
+		pr_err("failed to create sync_dev: %d\n", err);
+		goto err_unregister_async_driver;
+	}
+
+	sync_id++;
+
+	pr_info("registering synchronous driver...\n");
+	calltime = ktime_get();
+	err = platform_driver_register(&sync_driver);
+	if (err) {
+		pr_err("Failed to register async_driver: %d\n", err);
+		goto err_unregister_sync_devs;
+	}
+
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
+	pr_info("registration took %lld msecs\n", duration);
+	if (duration < TEST_PROBE_THRESHOLD) {
+		dev_err(&(*pdev)->dev,
+			"test failed: probe was too quick\n");
+		err = -ETIMEDOUT;
+		goto err_unregister_sync_driver;
+	}
+
+	pr_info("registering second synchronous device...\n");
+	pdev = &sync_dev[sync_id];
+	calltime = ktime_get();
+
+	*pdev = test_platform_device_register_node("test_sync_driver",
+						   sync_id,
+						   NUMA_NO_NODE);
+	if (IS_ERR(*pdev)) {
+		err = PTR_ERR(*pdev);
+		*pdev = NULL;
+		pr_err("failed to create sync_dev: %d\n", err);
+		goto err_unregister_sync_driver;
+	}
+
+	sync_id++;
+
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
+	dev_info(&(*pdev)->dev,
+		 "registration took %lld msecs\n", duration);
+	if (duration < TEST_PROBE_THRESHOLD) {
+		dev_err(&(*pdev)->dev,
+			"test failed: probe was too quick\n");
+		err = -ETIMEDOUT;
+		goto err_unregister_sync_driver;
+	}
+
+	/*
+	 * The async events should have completed while we were taking care
+	 * of the synchronous events. We will now terminate any outstanding
+	 * asynchronous probe calls remaining by forcing timeout and remove
+	 * the driver before we return which should force the flush of the
+	 * pending asynchronous probe calls.
+	 *
+	 * Otherwise if they completed without errors or warnings then
+	 * report successful completion.
+	 */
+	if (atomic_read(&async_completed) != async_id) {
+		pr_err("async events still pending, forcing timeout\n");
+		atomic_inc(&timeout);
+		err = -ETIMEDOUT;
+	} else if (!atomic_read(&errors) && !atomic_read(&warnings)) {
+		pr_info("completed successfully\n");
+		return 0;
+	}
+
+err_unregister_sync_driver:
+	platform_driver_unregister(&sync_driver);
+err_unregister_sync_devs:
+	while (sync_id--)
+		platform_device_unregister(sync_dev[sync_id]);
+err_unregister_async_driver:
+	platform_driver_unregister(&async_driver);
+err_unregister_async_devs:
+	while (async_id--)
+		platform_device_unregister(async_dev[async_id]);
+
+	/*
+	 * If err is already set then count that as an additional error for
+	 * the test. Otherwise we will report an invalid argument error and
+	 * not count that as we should have reached here as a result of
+	 * errors or warnings being reported by the probe routine.
+	 */
+	if (err)
+		atomic_inc(&errors);
+	else
+		err = -EINVAL;
+
+	pr_err("Test failed with %d errors and %d warnings\n",
+	       atomic_read(&errors), atomic_read(&warnings));
+
+	return err;
+}
+module_init(test_async_probe_init);
+
+static void __exit test_async_probe_exit(void)
+{
+	int id = 2;
+
+	platform_driver_unregister(&async_driver);
+	platform_driver_unregister(&sync_driver);
+
+	while (id--)
+		platform_device_unregister(sync_dev[id]);
+
+	id = NR_CPUS * 2;
+	while (id--)
+		platform_device_unregister(async_dev[id]);
+}
+module_exit(test_async_probe_exit);
+
+MODULE_DESCRIPTION("Test module for asynchronous driver probing");
+MODULE_AUTHOR("Dmitry Torokhov <dtor@chromium.org>");
+MODULE_LICENSE("GPL");