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, 309 insertions, 0 deletions

diff --git a/Documentation/dev-tools/kunit/start.rst b/Documentation/dev-tools/kunit/start.rst
new file mode 100644
index 000000000..a98235326
--- /dev/null
+++ b/Documentation/dev-tools/kunit/start.rst
@@ -0,0 +1,309 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+Getting Started
+===============
+
+This page contains an overview of the kunit_tool and KUnit framework,
+teaching how to run existing tests and then how to write a simple test case,
+and covers common problems users face when using KUnit for the first time.
+
+Installing Dependencies
+=======================
+KUnit has the same dependencies as the Linux kernel. As long as you can
+build the kernel, you can run KUnit.
+
+Running tests with kunit_tool
+=============================
+kunit_tool is a Python script, which configures and builds a kernel, runs
+tests, and formats the test results. From the kernel repository, you
+can run kunit_tool:
+
+.. code-block:: bash
+
+	./tools/testing/kunit/kunit.py run
+
+.. note ::
+	You may see the following error:
+	"The source tree is not clean, please run 'make ARCH=um mrproper'"
+
+	This happens because internally kunit.py specifies ``.kunit``
+	(default option) as the build directory in the command ``make O=output/dir``
+	through the argument ``--build_dir``.  Hence, before starting an
+	out-of-tree build, the source tree must be clean.
+
+	There is also the same caveat mentioned in the "Build directory for
+	the kernel" section of the :doc:`admin-guide </admin-guide/README>`,
+	that is, its use, it must be used for all invocations of ``make``.
+	The good news is that it can indeed be solved by running
+	``make ARCH=um mrproper``, just be aware that this will delete the
+	current configuration and all generated files.
+
+If everything worked correctly, you should see the following:
+
+.. code-block::
+
+	Configuring KUnit Kernel ...
+	Building KUnit Kernel ...
+	Starting KUnit Kernel ...
+
+The tests will pass or fail.
+
+.. note ::
+   Because it is building a lot of sources for the first time,
+   the ``Building KUnit Kernel`` step may take a while.
+
+For detailed information on this wrapper, see:
+Documentation/dev-tools/kunit/run_wrapper.rst.
+
+Selecting which tests to run
+----------------------------
+
+By default, kunit_tool runs all tests reachable with minimal configuration,
+that is, using default values for most of the kconfig options.  However,
+you can select which tests to run by:
+
+- `Customizing Kconfig`_ used to compile the kernel, or
+- `Filtering tests by name`_ to select specifically which compiled tests to run.
+
+Customizing Kconfig
+~~~~~~~~~~~~~~~~~~~
+A good starting point for the ``.kunitconfig`` is the KUnit default config.
+If you didn't run ``kunit.py run`` yet, you can generate it by running:
+
+.. code-block:: bash
+
+	cd $PATH_TO_LINUX_REPO
+	tools/testing/kunit/kunit.py config
+	cat .kunit/.kunitconfig
+
+.. note ::
+   ``.kunitconfig`` lives in the ``--build_dir`` used by kunit.py, which is
+   ``.kunit`` by default.
+
+Before running the tests, kunit_tool ensures that all config options
+set in ``.kunitconfig`` are set in the kernel ``.config``. It will warn
+you if you have not included dependencies for the options used.
+
+There are many ways to customize the configurations:
+
+a. Edit ``.kunit/.kunitconfig``. The file should contain the list of kconfig
+   options required to run the desired tests, including their dependencies.
+   You may want to remove CONFIG_KUNIT_ALL_TESTS from the ``.kunitconfig`` as
+   it will enable a number of additional tests that you may not want.
+   If you need to run on an architecture other than UML see :ref:`kunit-on-qemu`.
+
+b. Enable additional kconfig options on top of ``.kunit/.kunitconfig``.
+   For example, to include the kernel's linked-list test you can run::
+
+	./tools/testing/kunit/kunit.py run \
+		--kconfig_add CONFIG_LIST_KUNIT_TEST=y
+
+c. Provide the path of one or more .kunitconfig files from the tree.
+   For example, to run only ``FAT_FS`` and ``EXT4`` tests you can run::
+
+	./tools/testing/kunit/kunit.py run \
+		--kunitconfig ./fs/fat/.kunitconfig \
+		--kunitconfig ./fs/ext4/.kunitconfig
+
+d. If you change the ``.kunitconfig``, kunit.py will trigger a rebuild of the
+   ``.config`` file. But you can edit the ``.config`` file directly or with
+   tools like ``make menuconfig O=.kunit``. As long as its a superset of
+   ``.kunitconfig``, kunit.py won't overwrite your changes.
+
+
+.. note ::
+
+	To save a .kunitconfig after finding a satisfactory configuration::
+
+		make savedefconfig O=.kunit
+		cp .kunit/defconfig .kunit/.kunitconfig
+
+Filtering tests by name
+~~~~~~~~~~~~~~~~~~~~~~~
+If you want to be more specific than Kconfig can provide, it is also possible
+to select which tests to execute at boot-time by passing a glob filter
+(read instructions regarding the pattern in the manpage :manpage:`glob(7)`).
+If there is a ``"."`` (period) in the filter, it will be interpreted as a
+separator between the name of the test suite and the test case,
+otherwise, it will be interpreted as the name of the test suite.
+For example, let's assume we are using the default config:
+
+a. inform the name of a test suite, like ``"kunit_executor_test"``,
+   to run every test case it contains::
+
+	./tools/testing/kunit/kunit.py run "kunit_executor_test"
+
+b. inform the name of a test case prefixed by its test suite,
+   like ``"example.example_simple_test"``, to run specifically that test case::
+
+	./tools/testing/kunit/kunit.py run "example.example_simple_test"
+
+c. use wildcard characters (``*?[``) to run any test case that matches the pattern,
+   like ``"*.*64*"`` to run test cases containing ``"64"`` in the name inside
+   any test suite::
+
+	./tools/testing/kunit/kunit.py run "*.*64*"
+
+Running Tests without the KUnit Wrapper
+=======================================
+If you do not want to use the KUnit Wrapper (for example: you want code
+under test to integrate with other systems, or use a different/
+unsupported architecture or configuration), KUnit can be included in
+any kernel, and the results are read out and parsed manually.
+
+.. note ::
+   ``CONFIG_KUNIT`` should not be enabled in a production environment.
+   Enabling KUnit disables Kernel Address-Space Layout Randomization
+   (KASLR), and tests may affect the state of the kernel in ways not
+   suitable for production.
+
+Configuring the Kernel
+----------------------
+To enable KUnit itself, you need to enable the ``CONFIG_KUNIT`` Kconfig
+option (under Kernel Hacking/Kernel Testing and Coverage in
+``menuconfig``). From there, you can enable any KUnit tests. They
+usually have config options ending in ``_KUNIT_TEST``.
+
+KUnit and KUnit tests can be compiled as modules. The tests in a module
+will run when the module is loaded.
+
+Running Tests (without KUnit Wrapper)
+-------------------------------------
+Build and run your kernel. In the kernel log, the test output is printed
+out in the TAP format. This will only happen by default if KUnit/tests
+are built-in. Otherwise the module will need to be loaded.
+
+.. note ::
+   Some lines and/or data may get interspersed in the TAP output.
+
+Writing Your First Test
+=======================
+In your kernel repository, let's add some code that we can test.
+
+1. Create a file ``drivers/misc/example.h``, which includes:
+
+.. code-block:: c
+
+	int misc_example_add(int left, int right);
+
+2. Create a file ``drivers/misc/example.c``, which includes:
+
+.. code-block:: c
+
+	#include <linux/errno.h>
+
+	#include "example.h"
+
+	int misc_example_add(int left, int right)
+	{
+		return left + right;
+	}
+
+3. Add the following lines to ``drivers/misc/Kconfig``:
+
+.. code-block:: kconfig
+
+	config MISC_EXAMPLE
+		bool "My example"
+
+4. Add the following lines to ``drivers/misc/Makefile``:
+
+.. code-block:: make
+
+	obj-$(CONFIG_MISC_EXAMPLE) += example.o
+
+Now we are ready to write the test cases.
+
+1. Add the below test case in ``drivers/misc/example_test.c``:
+
+.. code-block:: c
+
+	#include <kunit/test.h>
+	#include "example.h"
+
+	/* Define the test cases. */
+
+	static void misc_example_add_test_basic(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, 1, misc_example_add(1, 0));
+		KUNIT_EXPECT_EQ(test, 2, misc_example_add(1, 1));
+		KUNIT_EXPECT_EQ(test, 0, misc_example_add(-1, 1));
+		KUNIT_EXPECT_EQ(test, INT_MAX, misc_example_add(0, INT_MAX));
+		KUNIT_EXPECT_EQ(test, -1, misc_example_add(INT_MAX, INT_MIN));
+	}
+
+	static void misc_example_test_failure(struct kunit *test)
+	{
+		KUNIT_FAIL(test, "This test never passes.");
+	}
+
+	static struct kunit_case misc_example_test_cases[] = {
+		KUNIT_CASE(misc_example_add_test_basic),
+		KUNIT_CASE(misc_example_test_failure),
+		{}
+	};
+
+	static struct kunit_suite misc_example_test_suite = {
+		.name = "misc-example",
+		.test_cases = misc_example_test_cases,
+	};
+	kunit_test_suite(misc_example_test_suite);
+
+	MODULE_LICENSE("GPL");
+
+2. Add the following lines to ``drivers/misc/Kconfig``:
+
+.. code-block:: kconfig
+
+	config MISC_EXAMPLE_TEST
+		tristate "Test for my example" if !KUNIT_ALL_TESTS
+		depends on MISC_EXAMPLE && KUNIT
+		default KUNIT_ALL_TESTS
+
+Note: If your test does not support being built as a loadable module (which is
+discouraged), replace tristate by bool, and depend on KUNIT=y instead of KUNIT.
+
+3. Add the following lines to ``drivers/misc/Makefile``:
+
+.. code-block:: make
+
+	obj-$(CONFIG_MISC_EXAMPLE_TEST) += example_test.o
+
+4. Add the following lines to ``.kunit/.kunitconfig``:
+
+.. code-block:: none
+
+	CONFIG_MISC_EXAMPLE=y
+	CONFIG_MISC_EXAMPLE_TEST=y
+
+5. Run the test:
+
+.. code-block:: bash
+
+	./tools/testing/kunit/kunit.py run
+
+You should see the following failure:
+
+.. code-block:: none
+
+	...
+	[16:08:57] [PASSED] misc-example:misc_example_add_test_basic
+	[16:08:57] [FAILED] misc-example:misc_example_test_failure
+	[16:08:57] EXPECTATION FAILED at drivers/misc/example-test.c:17
+	[16:08:57]      This test never passes.
+	...
+
+Congrats! You just wrote your first KUnit test.
+
+Next Steps
+==========
+
+If you're interested in using some of the more advanced features of kunit.py,
+take a look at Documentation/dev-tools/kunit/run_wrapper.rst
+
+If you'd like to run tests without using kunit.py, check out
+Documentation/dev-tools/kunit/run_manual.rst
+
+For more information on writing KUnit tests (including some common techniques
+for testing different things), see Documentation/dev-tools/kunit/usage.rst