PM: runtime: Add basic kunit tests for API contracts

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In exploring the various return codes and failure modes of runtime PM
APIs, I found it helpful to verify and codify many of them in unit
tests, especially given that even the kerneldoc can be rather complex to
reason through, and it also has had subtle errors of its own.

Notably, I avoid testing the return codes for pm_runtime_put() and
pm_runtime_put_autosuspend(), since code that checks them is probably
wrong, and we're considering making them return 'void' altogether. I
still test the sync() variants, since those have a bit more meaning to
them.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Brian Norris 2025-09-25 12:42:14 -07:00 • committed by Rafael J. Wysocki

parent 927f3e8501

commit 7f7acd193b

3 changed files with 260 additions and 0 deletions

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6

drivers/base/Kconfig

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1

drivers/base/power/Makefile

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253

drivers/base/power/runtime-test.c

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