From patchwork Mon Mar 20 14:43:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13181394 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 0D5B8C7618D for ; Mon, 20 Mar 2023 14:46:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231967AbjCTOqZ (ORCPT ); Mon, 20 Mar 2023 10:46:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231886AbjCTOp4 (ORCPT ); Mon, 20 Mar 2023 10:45:56 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 19F32EB73; Mon, 20 Mar 2023 07:45:11 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id o11so12681606ple.1; Mon, 20 Mar 2023 07:45:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679323511; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=HW0myZZejO7uNMRvPlac+lbEnpvRrjfPGVZeXhkTeDU=; b=PhP6+MY2gm+VfsWU6J4UMRMOHIYbVs8+vizsPZv168wBOIB9PALpYVfd6ZivPoEngY t/VUJFnA/t4Ix6GsI7xwhIXMkAYpKhhRp3xvngTue6Yr2fFXbtmHtWpAQB/s+naJOTYw IRTZeCf/1OLyWnQopg4LLMR+VeOJW0SWboQWMJmtAUiYKPEyPfrp5RIa7I8htQgDrv7u Id7p9NjiUuVcsJhDDDBEShANjbF6FYb4DklqnEW405YxDUdx+2496YftV81PkBEMAJVb 1iddGsKJ7Zt798qVPBcNgXNRq0rx7b3ZiQPIaKcFfUSv7FPK9Xd9DR2vPRCvRDOQgqRi 4D2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679323511; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=HW0myZZejO7uNMRvPlac+lbEnpvRrjfPGVZeXhkTeDU=; b=i3CyqmY8vAPd+7VRJnahofMHzed8s099n1auEgtIfB4Uyk6R8naGFiG9YxGv8bUV8d EWZuE9kiZafCyNQQEbV/LsrnTmayd/Iy7P4pcYlKDkTUvpGOUzUJM/05uQhTNdCtsOOC TQ8GGnGW7o8vFhCLeQGV6lqnG3GYwIpSMyXxyex1Y5y9/q4vIHzLfr11FJ1LBEdLD13D ORoSwwwhNeK9puSXWADn06E5tnyoHSK5sl7AlULPQP/6cB8PQYyi5fwqK3amIFtPrUDW 2pmlYgosfbBmRMEpf79NZBikEObeXjkEkFJKSHa1Z/fuY+3JFg5g/d53rnMk24fIKQds d3Qw== X-Gm-Message-State: AO0yUKUs0PIKSDjE9NPz5e98vFbcgisCeSdjKyh/uGaamXgNb147/Nvm 91t4hty+BQqEVOoa1bDV7ZM= X-Google-Smtp-Source: AK7set8dqJQ+HWWTlRCoB9bVOq+YmX/QlpDsIah5XuQdk5bfZ+gnkND2WAlzEoISE8F1IrVQp/Nnmw== X-Received: by 2002:a05:6a20:be09:b0:d6:9e5e:f240 with SMTP id ge9-20020a056a20be0900b000d69e5ef240mr13319951pzb.4.1679323511174; Mon, 20 Mar 2023 07:45:11 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:61b:48ed:72ab:435b]) by smtp.gmail.com with ESMTPSA id u15-20020a62ed0f000000b005809d382016sm6433907pfh.74.2023.03.20.07.45.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Mar 2023 07:45:10 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Daniel Vetter , freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Rob Clark , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Greg Kroah-Hartman , linux-pm@vger.kernel.org (open list:HIBERNATION (aka Software Suspend, aka swsusp)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 19/23] PM / QoS: Teach lockdep about dev_pm_qos_mtx locking order Date: Mon, 20 Mar 2023 07:43:41 -0700 Message-Id: <20230320144356.803762-20-robdclark@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230320144356.803762-1-robdclark@gmail.com> References: <20230320144356.803762-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark Annotate dev_pm_qos_mtx to teach lockdep to scream about allocations that could trigger reclaim under dev_pm_qos_mtx. Signed-off-by: Rob Clark --- drivers/base/power/qos.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 9cba334b3729..d4addda3944a 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -1012,3 +1012,14 @@ void dev_pm_qos_hide_latency_tolerance(struct device *dev) pm_runtime_put(dev); } EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance); + +static int __init dev_pm_qos_init(void) +{ + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&dev_pm_qos_mtx); + fs_reclaim_release(GFP_KERNEL); + + return 0; +} +early_initcall(dev_pm_qos_init);