Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 366 insertions, 0 deletions

diff --git a/lib/kunit/platform.c b/lib/kunit/platform.c
new file mode 100644
index 000000000..737758d71
--- /dev/null
+++ b/lib/kunit/platform.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test managed platform driver
+ */
+
+#include <linux/completion.h>
+#include <linux/device/bus.h>
+#include <linux/device/driver.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#include <kunit/platform_device.h>
+#include <kunit/resource.h>
+
+struct kunit_platform_device_alloc_params {
+	const char *name;
+	int id;
+};
+
+static int kunit_platform_device_alloc_init(struct kunit_resource *res, void *context)
+{
+	struct kunit_platform_device_alloc_params *params = context;
+	struct platform_device *pdev;
+
+	pdev = platform_device_alloc(params->name, params->id);
+	if (!pdev)
+		return -ENOMEM;
+
+	res->data = pdev;
+
+	return 0;
+}
+
+static void kunit_platform_device_alloc_exit(struct kunit_resource *res)
+{
+	struct platform_device *pdev = res->data;
+
+	platform_device_put(pdev);
+}
+
+/**
+ * kunit_platform_device_alloc() - Allocate a KUnit test managed platform device
+ * @test: test context
+ * @name: device name of platform device to alloc
+ * @id: identifier of platform device to alloc.
+ *
+ * Allocate a test managed platform device. The device is put when the test completes.
+ *
+ * Return: Allocated platform device on success, NULL on failure.
+ */
+struct platform_device *
+kunit_platform_device_alloc(struct kunit *test, const char *name, int id)
+{
+	struct kunit_platform_device_alloc_params params = {
+		.name = name,
+		.id = id,
+	};
+
+	return kunit_alloc_resource(test,
+				    kunit_platform_device_alloc_init,
+				    kunit_platform_device_alloc_exit,
+				    GFP_KERNEL, &params);
+}
+EXPORT_SYMBOL_GPL(kunit_platform_device_alloc);
+
+static void kunit_platform_device_add_exit(struct kunit_resource *res)
+{
+	struct platform_device *pdev = res->data;
+
+	platform_device_unregister(pdev);
+}
+
+static bool
+kunit_platform_device_alloc_match(struct kunit *test,
+				  struct kunit_resource *res, void *match_data)
+{
+	struct platform_device *pdev = match_data;
+
+	return res->data == pdev && res->free == kunit_platform_device_alloc_exit;
+}
+
+KUNIT_DEFINE_ACTION_WRAPPER(platform_device_unregister_wrapper,
+			    platform_device_unregister, struct platform_device *);
+/**
+ * kunit_platform_device_add() - Register a KUnit test managed platform device
+ * @test: test context
+ * @pdev: platform device to add
+ *
+ * Register a test managed platform device. The device is unregistered when the
+ * test completes.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int kunit_platform_device_add(struct kunit *test, struct platform_device *pdev)
+{
+	struct kunit_resource *res;
+	int ret;
+
+	ret = platform_device_add(pdev);
+	if (ret)
+		return ret;
+
+	res = kunit_find_resource(test, kunit_platform_device_alloc_match, pdev);
+	if (res) {
+		/*
+		 * Transfer the reference count of the platform device if it
+		 * was allocated with kunit_platform_device_alloc(). In this
+		 * case, calling platform_device_put() when the test exits from
+		 * kunit_platform_device_alloc_exit() would lead to reference
+		 * count underflow because platform_device_unregister_wrapper()
+		 * calls platform_device_unregister() which also calls
+		 * platform_device_put().
+		 *
+		 * Usually callers transfer the refcount initialized in
+		 * platform_device_alloc() to platform_device_add() by calling
+		 * platform_device_unregister() when platform_device_add()
+		 * succeeds or platform_device_put() when it fails. KUnit has to
+		 * keep this straight by redirecting the free routine for the
+		 * resource to the right function. Luckily this only has to
+		 * account for the success scenario.
+		 */
+		res->free = kunit_platform_device_add_exit;
+		kunit_put_resource(res);
+	} else {
+		ret = kunit_add_action_or_reset(test, platform_device_unregister_wrapper, pdev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(kunit_platform_device_add);
+
+/**
+ * kunit_platform_device_register_full() - Register a KUnit test-managed platform
+ *                                         device described by platform device info
+ * @test: test context
+ * @pdevinfo: platform device information describing the new device
+ *
+ * Register a test-managed platform device. The device is unregistered when the
+ * test completes.
+ *
+ * Return: New platform device on success, IS_ERR() on error.
+ */
+struct platform_device *
+kunit_platform_device_register_full(struct kunit *test,
+				    const struct platform_device_info *pdevinfo)
+{
+	struct platform_device *pdev;
+	int ret;
+
+	pdev = platform_device_register_full(pdevinfo);
+	if (IS_ERR(pdev))
+		return pdev;
+
+	ret = kunit_add_action_or_reset(test, platform_device_unregister_wrapper, pdev);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return pdev;
+}
+EXPORT_SYMBOL_GPL(kunit_platform_device_register_full);
+
+static bool
+kunit_platform_device_add_match(struct kunit *test, struct kunit_resource *res,
+				void *match_data)
+{
+	struct platform_device *pdev = match_data;
+
+	return res->data == pdev && res->free == kunit_platform_device_add_exit;
+}
+
+/**
+ * kunit_platform_device_unregister() - Unregister a KUnit-managed platform device
+ * @test: test context
+ * @pdev: platform device to unregister
+ *
+ * Unregister a test-managed platform device and cancel its release action.
+ */
+void kunit_platform_device_unregister(struct kunit *test,
+				      struct platform_device *pdev)
+{
+	struct kunit_resource *res;
+
+	res = kunit_find_resource(test, kunit_platform_device_add_match, pdev);
+	if (res) {
+		res->free = NULL;
+		kunit_put_resource(res);
+	} else {
+		kunit_remove_action(test, platform_device_unregister_wrapper, pdev);
+	}
+
+	platform_device_unregister(pdev);
+}
+EXPORT_SYMBOL_GPL(kunit_platform_device_unregister);
+
+struct kunit_platform_device_probe_nb {
+	struct completion *x;
+	struct device *dev;
+	struct notifier_block nb;
+};
+
+static int kunit_platform_device_probe_notify(struct notifier_block *nb,
+					      unsigned long event, void *data)
+{
+	struct kunit_platform_device_probe_nb *knb;
+	struct device *dev = data;
+
+	knb = container_of(nb, struct kunit_platform_device_probe_nb, nb);
+	if (event != BUS_NOTIFY_BOUND_DRIVER || knb->dev != dev)
+		return NOTIFY_DONE;
+
+	complete(knb->x);
+
+	return NOTIFY_OK;
+}
+
+static void kunit_platform_device_probe_nb_remove(void *nb)
+{
+	bus_unregister_notifier(&platform_bus_type, nb);
+}
+
+/**
+ * kunit_platform_device_prepare_wait_for_probe() - Prepare a completion
+ * variable to wait for a platform device to probe
+ * @test: test context
+ * @pdev: platform device to prepare to wait for probe of
+ * @x: completion variable completed when @dev has probed
+ *
+ * Prepare a completion variable @x to wait for @pdev to probe. Waiting on the
+ * completion forces a preemption, allowing the platform driver to probe.
+ *
+ * Example
+ *
+ * .. code-block:: c
+ *
+ *	static int kunit_platform_driver_probe(struct platform_device *pdev)
+ *	{
+ *		return 0;
+ *	}
+ *
+ *	static void kunit_platform_driver_test(struct kunit *test)
+ *	{
+ *		struct platform_device *pdev;
+ *		struct platform_driver *pdrv;
+ *		DECLARE_COMPLETION_ONSTACK(comp);
+ *
+ *		pdev = kunit_platform_device_alloc(test, "kunit-platform", -1);
+ *		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
+ *		KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_add(test, pdev));
+ *
+ *		pdrv = kunit_kzalloc(test, sizeof(*pdrv), GFP_KERNEL);
+ *		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdrv);
+ *
+ *		pdrv->probe = kunit_platform_driver_probe;
+ *		pdrv->driver.name = "kunit-platform";
+ *		pdrv->driver.owner = THIS_MODULE;
+ *
+ *		KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_prepare_wait_for_probe(test, pdev, &comp));
+ *		KUNIT_ASSERT_EQ(test, 0, kunit_platform_driver_register(test, pdrv));
+ *
+ *		KUNIT_EXPECT_NE(test, 0, wait_for_completion_timeout(&comp, 3 * HZ));
+ *	}
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int kunit_platform_device_prepare_wait_for_probe(struct kunit *test,
+						 struct platform_device *pdev,
+						 struct completion *x)
+{
+	struct device *dev = &pdev->dev;
+	struct kunit_platform_device_probe_nb *knb;
+	bool bound;
+
+	knb = kunit_kzalloc(test, sizeof(*knb), GFP_KERNEL);
+	if (!knb)
+		return -ENOMEM;
+
+	knb->nb.notifier_call = kunit_platform_device_probe_notify;
+	knb->dev = dev;
+	knb->x = x;
+
+	device_lock(dev);
+	bound = device_is_bound(dev);
+	if (bound) {
+		device_unlock(dev);
+		complete(x);
+		kunit_kfree(test, knb);
+		return 0;
+	}
+
+	bus_register_notifier(&platform_bus_type, &knb->nb);
+	device_unlock(&pdev->dev);
+
+	return kunit_add_action_or_reset(test, kunit_platform_device_probe_nb_remove, &knb->nb);
+}
+EXPORT_SYMBOL_GPL(kunit_platform_device_prepare_wait_for_probe);
+
+KUNIT_DEFINE_ACTION_WRAPPER(platform_driver_unregister_wrapper,
+			    platform_driver_unregister, struct platform_driver *);
+/**
+ * kunit_platform_driver_register() - Register a KUnit test managed platform driver
+ * @test: test context
+ * @drv: platform driver to register
+ *
+ * Register a test managed platform driver. This allows callers to embed the
+ * @drv in a container structure and use container_of() in the probe function
+ * to pass information to KUnit tests.
+ *
+ * Example
+ *
+ * .. code-block:: c
+ *
+ *	struct kunit_test_context {
+ *		struct platform_driver pdrv;
+ *		const char *data;
+ *	};
+ *
+ *	static inline struct kunit_test_context *
+ *	to_test_context(struct platform_device *pdev)
+ *	{
+ *		return container_of(to_platform_driver(pdev->dev.driver),
+ *				    struct kunit_test_context,
+ *				    pdrv);
+ *	}
+ *
+ *	static int kunit_platform_driver_probe(struct platform_device *pdev)
+ *	{
+ *		struct kunit_test_context *ctx;
+ *
+ *		ctx = to_test_context(pdev);
+ *		ctx->data = "test data";
+ *
+ *		return 0;
+ *	}
+ *
+ *	static void kunit_platform_driver_test(struct kunit *test)
+ *	{
+ *		struct kunit_test_context *ctx;
+ *
+ *		ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+ *		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+ *
+ *		ctx->pdrv.probe = kunit_platform_driver_probe;
+ *		ctx->pdrv.driver.name = "kunit-platform";
+ *		ctx->pdrv.driver.owner = THIS_MODULE;
+ *
+ *		KUNIT_EXPECT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv));
+ *		<... wait for driver to probe ...>
+ *		KUNIT_EXPECT_STREQ(test, ctx->data, "test data");
+ *	}
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int kunit_platform_driver_register(struct kunit *test,
+				   struct platform_driver *drv)
+{
+	int ret;
+
+	ret = platform_driver_register(drv);
+	if (ret)
+		return ret;
+
+	return kunit_add_action_or_reset(test, platform_driver_unregister_wrapper, drv);
+}
+EXPORT_SYMBOL_GPL(kunit_platform_driver_register);