Messages in this thread Patch in this message | | | From | Maxime Ripard <> | Date | Fri, 21 Jul 2023 09:09:33 +0200 | Subject | [PATCH 2/2] clk: Introduce kunit wrapper around __clk_determine_rate |
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Some kunit tests are meant to test the behaviour of providers but don't run those functions with the clk prepare_lock held which results in lockdep warning.
__clk_determine_rate is one of the functions being executed from a test which should have the lock held. Let's introduce a wrapper around it meant to be used only by kunit tests.
Reported-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/linux-clk/2b594e50-2bbf-4a2d-88e6-49fc39f3957a@roeck-us.net/ Reported-by: kernel test robot <yujie.liu@intel.com> Link: https://lore.kernel.org/oe-lkp/202301310919.b9d56ee3-yujie.liu@intel.com Fixes: 262ca38f4b6e ("clk: Stop forwarding clk_rate_requests to the parent") Signed-off-by: Maxime Ripard <mripard@kernel.org> --- drivers/clk/clk.c | 25 +++++++++++++++++++++++++ drivers/clk/clk_test.c | 2 +- include/linux/clk-provider.h | 10 ++++++++++ 3 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 8ee9bd02af76..8fdbfec6bd85 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1669,6 +1669,31 @@ int __clk_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) } EXPORT_SYMBOL_GPL(__clk_determine_rate); +#if IS_ENABLED(CONFIG_KUNIT) +/** + * __clk_kunit_determine_rate - get the closest rate actually supported by a clock + * @hw: determine the rate of this clock + * @req: target rate request + * + * Useful for clk_ops such as .set_rate and .determine_rate. Only usable + * in a kunit test context. Use __clk_determine_rate() otherwise. + */ +int __clk_kunit_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) +{ + int ret; + + if (!kunit_get_current_test()) + return -EINVAL; + + clk_prepare_lock(); + ret = __clk_determine_rate(hw, req); + clk_prepare_unlock(); + + return ret; +} +EXPORT_SYMBOL_GPL(__clk_kunit_determine_rate); +#endif + /** * clk_hw_round_rate() - round the given rate for a hw clk * @hw: the hw clk for which we are rounding a rate diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c index a64f7036baa3..b835e08892b4 100644 --- a/drivers/clk/clk_test.c +++ b/drivers/clk/clk_test.c @@ -2232,7 +2232,7 @@ static void clk_leaf_mux_set_rate_parent_determine_rate(struct kunit *test) clk_kunit_init_rate_request(hw, &req, DUMMY_CLOCK_RATE_2); - ret = __clk_determine_rate(hw, &req); + ret = __clk_kunit_determine_rate(hw, &req); KUNIT_ASSERT_EQ(test, ret, 0); KUNIT_EXPECT_EQ(test, req.rate, DUMMY_CLOCK_RATE_2); diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index efdebfa3fce9..43049f2c1dd2 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -1352,6 +1352,16 @@ void clk_hw_get_rate_range(struct clk_hw *hw, unsigned long *min_rate, void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate, unsigned long max_rate); +#if IS_ENABLED(CONFIG_KUNIT) +int __clk_kunit_determine_rate(struct clk_hw *hw, struct clk_rate_request *req); +#else +static inline int __clk_kunit_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + return -ENOENT; +} +#endif + static inline void __clk_hw_set_clk(struct clk_hw *dst, struct clk_hw *src) { dst->clk = src->clk; -- 2.41.0
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