From patchwork Fri Jul 21 07:09:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13321444 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E519EB64DC for ; Fri, 21 Jul 2023 07:09:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229731AbjGUHJq (ORCPT ); Fri, 21 Jul 2023 03:09:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230020AbjGUHJk (ORCPT ); Fri, 21 Jul 2023 03:09:40 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6257D273E; Fri, 21 Jul 2023 00:09:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E5BB261416; Fri, 21 Jul 2023 07:09:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA145C433CA; Fri, 21 Jul 2023 07:09:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689923378; bh=MY8zoSsf9fgRkDcy3MJpnTeax5YDOFKq4s0E/rUA/rE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=QCz4J47ztfPLM+FQOIBqYlXwzBrf8lVvgOXQs8+oRZor1xHKr/BZXOze6pUVPQS4E Udm99VWZyU8iIYwg9ip5koylLFCXWKi7dTusE58hOuOXsccSAyYdPFng9GDdYcLqXK 6dpRD1zvipmV9paBFQS0kEsnYUaDVbOXrqezqa407/3PzGY1sPIIKg/vBLDSzL8OMU IKr+hG0PvIR24pX30uh+iPIr1B2lT45H1Mg8v7NjHYNX4L0A7tJ+2F2MTwQR2e9Tzv Dt0kK1G8VxM19aeJafN5k7RiDOiuj9XEovkOEXWOLdF+vUmQpblZMbRMz3gcxtBA85 8bg/PNwOVDyVA== From: Maxime Ripard Date: Fri, 21 Jul 2023 09:09:32 +0200 Subject: [PATCH 1/2] clk: Introduce kunit wrapper around clk_hw_init_rate_request MIME-Version: 1.0 Message-Id: <20230721-clk-fix-kunit-lockdep-v1-1-32cdba4c8fc1@kernel.org> References: <20230721-clk-fix-kunit-lockdep-v1-0-32cdba4c8fc1@kernel.org> In-Reply-To: <20230721-clk-fix-kunit-lockdep-v1-0-32cdba4c8fc1@kernel.org> To: Michael Turquette , Stephen Boyd Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Maxime Ripard , Guenter Roeck , kernel test robot X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3879; i=mripard@kernel.org; h=from:subject:message-id; bh=MY8zoSsf9fgRkDcy3MJpnTeax5YDOFKq4s0E/rUA/rE=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDCm79HW2OW2yclFfd3DdyTpX94aposc1xc5XpVi8lBBd2 3vc89uUjlIWBjEuBlkxRZYYYfMlcadmve5k45sHM4eVCWQIAxenAEzkXQcjw4tV517GiWVOnvC7 6XCb8NHrta7rbx35M7F5LU9hdVFR7xKG/x6yuttlIhkalnwKjyux35p69rlqY2u0+eFJHG9Xyk+ NZQEA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Some kunit tests are meant to test the behaviour of providers (and most notably __clk_determine_rate()), but don't run those functions with the clk prepare_lock held which results in lockdep warning. clk_hw_init_rate_request 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 Link: https://lore.kernel.org/linux-clk/2b594e50-2bbf-4a2d-88e6-49fc39f3957a@roeck-us.net/ Reported-by: kernel test robot 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 Tested-by: Guenter Roeck --- drivers/clk/clk.c | 26 ++++++++++++++++++++++++++ drivers/clk/clk_test.c | 2 +- include/linux/clk-provider.h | 11 +++++++++++ 3 files changed, 38 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index c249f9791ae8..8ee9bd02af76 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -6,6 +6,7 @@ * Standard functionality for the common clock API. See Documentation/driver-api/clk.rst */ +#include #include #include #include @@ -1556,6 +1557,31 @@ void clk_hw_init_rate_request(const struct clk_hw *hw, } EXPORT_SYMBOL_GPL(clk_hw_init_rate_request); +#if IS_ENABLED(CONFIG_KUNIT) +/** + * clk_kunit_init_rate_request - Initializes a clk_rate_request + * @hw: the clk for which we want to submit a rate request + * @req: the clk_rate_request structure we want to initialise + * @rate: the rate which is to be requested + * + * Initializes a clk_rate_request structure to submit to + * __clk_determine_rate() or similar functions. Only usable in kunit + * test contexts, use clk_hw_init_rate_request() otherwise. + */ +void clk_kunit_init_rate_request(const struct clk_hw *hw, + struct clk_rate_request *req, + unsigned long rate) +{ + if (!kunit_get_current_test()) + return; + + clk_prepare_lock(); + clk_hw_init_rate_request(hw, req, rate); + clk_prepare_unlock(); +} +EXPORT_SYMBOL_GPL(clk_kunit_init_rate_request); +#endif + /** * clk_hw_forward_rate_request - Forwards a clk_rate_request to a clock's parent * @hw: the original clock that got the rate request diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c index a154ec9d0111..a64f7036baa3 100644 --- a/drivers/clk/clk_test.c +++ b/drivers/clk/clk_test.c @@ -2230,7 +2230,7 @@ static void clk_leaf_mux_set_rate_parent_determine_rate(struct kunit *test) rate = clk_get_rate(clk); KUNIT_ASSERT_EQ(test, rate, DUMMY_CLOCK_RATE_1); - clk_hw_init_rate_request(hw, &req, DUMMY_CLOCK_RATE_2); + clk_kunit_init_rate_request(hw, &req, DUMMY_CLOCK_RATE_2); ret = __clk_determine_rate(hw, &req); KUNIT_ASSERT_EQ(test, ret, 0); diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 0f0cd01906b4..efdebfa3fce9 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -67,6 +67,17 @@ struct clk_rate_request { void clk_hw_init_rate_request(const struct clk_hw *hw, struct clk_rate_request *req, unsigned long rate); +#if IS_ENABLED(CONFIG_KUNIT) +void clk_kunit_init_rate_request(const struct clk_hw *hw, + struct clk_rate_request *req, + unsigned long rate); +#else +static inline void clk_kunit_init_rate_request(const struct clk_hw *hw, + struct clk_rate_request *req, + unsigned long rate) +{ +} +#endif void clk_hw_forward_rate_request(const struct clk_hw *core, const struct clk_rate_request *old_req, const struct clk_hw *parent,