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From: David Gow <davidgow@google.com>
Date: Wed, 1 May 2024 16:08:11 +0800
Message-ID: <CABVgOSmgUJp3FijpYGCphi1OzRUNvmYQmPDdL6mN59YnbkR2iQ@mail.gmail.com>
Subject: Re: [PATCH v4 00/10] clk: Add kunit tests for fixed rate and parent data
To: Stephen Boyd <sboyd@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>, linux-kernel@vger.kernel.org, 
	linux-clk@vger.kernel.org, patches@lists.linux.dev, 
	kunit-dev@googlegroups.com, linux-kselftest@vger.kernel.org, 
	devicetree@vger.kernel.org, Brendan Higgins <brendan.higgins@linux.dev>, 
	Rae Moar <rmoar@google.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 
	"Rafael J . Wysocki" <rafael@kernel.org>, Rob Herring <robh@kernel.org>, 
	Saravana Kannan <saravanak@google.com>, Daniel Latypov <dlatypov@google.com>, 
	Christian Marangi <ansuelsmth@gmail.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, 
	Maxime Ripard <maxime@cerno.tech>
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On Tue, 23 Apr 2024 at 07:24, Stephen Boyd <sboyd@kernel.org> wrote:
>
> This patch series adds unit tests for the clk fixed rate basic type and
> the clk registration functions that use struct clk_parent_data. To get
> there, we add support for loading device tree overlays onto the live DTB
> along with probing platform drivers to bind to device nodes in the
> overlays. With this series, we're able to exercise some of the code in
> the common clk framework that uses devicetree lookups to find parents
> and the fixed rate clk code that scans device tree directly and creates
> clks. Please review.
>
> I Cced everyone to all the patches so they get the full context. I'm
> hoping I can take the whole pile through the clk tree as they all build
> upon each other. Or the DT part can be merged through the DT tree to
> reduce the dependencies.
>
> Changes from v3 (https://lore.kernel.org/r/20230327222159.3509818-1-sboyd@kernel.org):
>  * No longer depend on Frank's series[1] because it was merged upstream[2]
>  * Use kunit_add_action_or_reset() to shorten code
>  * Skip tests properly when CONFIG_OF_OVERLAY isn't set
>
> Changes from v2 (https://lore.kernel.org/r/20230315183729.2376178-1-sboyd@kernel.org):
>  * Overlays don't depend on __symbols__ node
>  * Depend on Frank's always create root node if CONFIG_OF series[1]
>  * Added kernel-doc to KUnit API doc
>  * Fixed some kernel-doc on functions
>  * More test cases for fixed rate clk
>
> Changes from v1 (https://lore.kernel.org/r/20230302013822.1808711-1-sboyd@kernel.org):
>  * Don't depend on UML, use unittest data approach to attach nodes
>  * Introduce overlay loading API for KUnit
>  * Move platform_device KUnit code to drivers/base/test
>  * Use #define macros for constants shared between unit tests and
>    overlays
>  * Settle on "test" as a vendor prefix
>  * Make KUnit wrappers have "_kunit" postfix
>
> [1] https://lore.kernel.org/r/20230317053415.2254616-1-frowand.list@gmail.com
> [2] https://lore.kernel.org/r/20240308195737.GA1174908-robh@kernel.org
>

Thanks very much. I'm about halfway through reviewing these, and I
like them a lot so far.

Most of my thoughts are just naming ideas. I fear some of them may be
the reverse of previous suggestions, as we've since landed the KUnit
device wrappers in include/kunit/device.h, which we decided would live
as part of KUnit, not as part of the device infrastructure. I don't
enormously mind if we make the opposite decision for these, though it
does seem a bit inconsistent if we do 'devices' differently from
'platform_devices'. Thoughts?

The other thing I've noted so far is that the
of_apply_kunit_platform_device and of_overlay_apply_kunit_cleanup
tests fail (and BUG() with a NULL pointer) on powerpc:
> [15:18:51]     # of_overlay_apply_kunit_platform_device: EXPECTATION FAILED at drivers/of/overlay_test.c:47
> [15:18:51]     Expected pdev is not null, but is
> [15:18:51] BUG: Kernel NULL pointer dereference at 0x0000004c
<...>
> [15:18:51]     # of_overlay_apply_kunit_platform_device: try faulted: last line seen lib/kunit/resource.c:99
> [15:18:51]     # of_overlay_apply_kunit_platform_device: internal error occurred preventing test case from running: -4
> [15:18:51] [FAILED] of_overlay_apply_kunit_platform_device

> [15:18:51] BUG: Kernel NULL pointer dereference at 0x0000004c
> [15:18:51] note: kunit_try_catch[698] exited with irqs disabled
> [15:18:51]     # of_overlay_apply_kunit_cleanup: try faulted: last line seen drivers/of/overlay_test.c:77
> [15:18:51]     # of_overlay_apply_kunit_cleanup: internal error occurred preventing test case from running: -4
> [15:18:51] [FAILED] of_overlay_apply_kunit_cleanup

I've not had a chance to dig into it any further, yet, but it appears
to work on all of the other architectures I tried.

Otherwise, I think this would be fine to take via either the clk or DT
and clk trees: there are no conflicts with the current KUnit changes
for 6.10. At worst, we might hit some conflicts in the documentation,
but there's nothing scheduled yet.

Cheers,
-- David

> Stephen Boyd (10):
>   of: Add test managed wrappers for of_overlay_apply()/of_node_put()
>   dt-bindings: vendor-prefixes: Add "test" vendor for KUnit and friends
>   dt-bindings: test: Add KUnit empty node binding
>   of: Add a KUnit test for overlays and test managed APIs
>   platform: Add test managed platform_device/driver APIs
>   dt-bindings: kunit: Add fixed rate clk consumer test
>   clk: Add test managed clk provider/consumer APIs
>   clk: Add KUnit tests for clk fixed rate basic type
>   dt-bindings: clk: Add KUnit clk_parent_data test
>   clk: Add KUnit tests for clks registered with struct clk_parent_data
>
>  Documentation/dev-tools/kunit/api/clk.rst     |  10 +
>  Documentation/dev-tools/kunit/api/index.rst   |  21 +
>  Documentation/dev-tools/kunit/api/of.rst      |  13 +
>  .../dev-tools/kunit/api/platformdevice.rst    |  10 +
>  .../bindings/clock/test,clk-parent-data.yaml  |  47 ++
>  .../bindings/test/test,clk-fixed-rate.yaml    |  35 ++
>  .../devicetree/bindings/test/test,empty.yaml  |  30 ++
>  .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
>  drivers/base/test/Makefile                    |   3 +
>  drivers/base/test/platform_kunit-test.c       | 140 ++++++
>  drivers/base/test/platform_kunit.c            | 174 +++++++
>  drivers/clk/.kunitconfig                      |   2 +
>  drivers/clk/Kconfig                           |   9 +
>  drivers/clk/Makefile                          |   9 +-
>  drivers/clk/clk-fixed-rate_test.c             | 377 +++++++++++++++
>  drivers/clk/clk-fixed-rate_test.h             |   8 +
>  drivers/clk/clk_kunit.c                       | 198 ++++++++
>  drivers/clk/clk_parent_data_test.h            |  10 +
>  drivers/clk/clk_test.c                        | 451 +++++++++++++++++-
>  drivers/clk/kunit_clk_fixed_rate_test.dtso    |  19 +
>  drivers/clk/kunit_clk_parent_data_test.dtso   |  28 ++
>  drivers/of/.kunitconfig                       |   1 +
>  drivers/of/Kconfig                            |  10 +
>  drivers/of/Makefile                           |   2 +
>  drivers/of/kunit_overlay_test.dtso            |   9 +
>  drivers/of/of_kunit.c                         |  99 ++++
>  drivers/of/overlay_test.c                     | 115 +++++
>  include/kunit/clk.h                           |  28 ++
>  include/kunit/of.h                            |  94 ++++
>  include/kunit/platform_device.h               |  15 +
>  30 files changed, 1967 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/dev-tools/kunit/api/clk.rst
>  create mode 100644 Documentation/dev-tools/kunit/api/of.rst
>  create mode 100644 Documentation/dev-tools/kunit/api/platformdevice.rst
>  create mode 100644 Documentation/devicetree/bindings/clock/test,clk-parent-data.yaml
>  create mode 100644 Documentation/devicetree/bindings/test/test,clk-fixed-rate.yaml
>  create mode 100644 Documentation/devicetree/bindings/test/test,empty.yaml
>  create mode 100644 drivers/base/test/platform_kunit-test.c
>  create mode 100644 drivers/base/test/platform_kunit.c
>  create mode 100644 drivers/clk/clk-fixed-rate_test.c
>  create mode 100644 drivers/clk/clk-fixed-rate_test.h
>  create mode 100644 drivers/clk/clk_kunit.c
>  create mode 100644 drivers/clk/clk_parent_data_test.h
>  create mode 100644 drivers/clk/kunit_clk_fixed_rate_test.dtso
>  create mode 100644 drivers/clk/kunit_clk_parent_data_test.dtso
>  create mode 100644 drivers/of/kunit_overlay_test.dtso
>  create mode 100644 drivers/of/of_kunit.c
>  create mode 100644 drivers/of/overlay_test.c
>  create mode 100644 include/kunit/clk.h
>  create mode 100644 include/kunit/of.h
>  create mode 100644 include/kunit/platform_device.h
>
>
> base-commit: 4cece764965020c22cff7665b18a012006359095
> --
> https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/
> https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git
>

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