From patchwork Wed Dec 7 04:42:05 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 86959 Delivered-To: patch@linaro.org Received: by 10.140.20.101 with SMTP id 92csp136858qgi; Tue, 6 Dec 2016 20:42:43 -0800 (PST) X-Received: by 10.98.214.157 with SMTP id a29mr66219225pfl.162.1481085763689; Tue, 06 Dec 2016 20:42:43 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h67si22465114pfe.48.2016.12.06.20.42.43; Tue, 06 Dec 2016 20:42:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-pm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-pm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-pm-owner@vger.kernel.org; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752007AbcLGEmm (ORCPT + 13 others); Tue, 6 Dec 2016 23:42:42 -0500 Received: from mail-pf0-f175.google.com ([209.85.192.175]:34490 "EHLO mail-pf0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751618AbcLGEmm (ORCPT ); Tue, 6 Dec 2016 23:42:42 -0500 Received: by mail-pf0-f175.google.com with SMTP id c4so74723025pfb.1 for ; Tue, 06 Dec 2016 20:42:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=piw7xZ/BA5aEsXgvDzTvPX0IxtPt2vV4kc2yLMXizKY=; b=WKydefxqM5vqlh0ewd84D+YjHcAgXjaUjsrsqPSIH2GP1aZ2C8dafOTGVw0/s6o6/a n+jPCGwFQedphtO3TeYhU6jXnJxLwtRuLcA0vFr8B5uL6OEGr4jAfHqYKMQldEIlGhJT QxQYPtnlkt9V5PCHApk+zPqUwGBOnkPdZ5kHY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=piw7xZ/BA5aEsXgvDzTvPX0IxtPt2vV4kc2yLMXizKY=; b=a2exUO+kD/tYanwvXEFo0Q4YVAtgCGj/2xGz/vtBN+Ax/Fu7dG++c07V+3P2SW+KWp EJbe6V78dASX7dNImv7U8cVK/x3dV3WK7zTkmbt49HkfYE+MKYIZe53NKySaB9RAX5Bt odUS1s3ClaYmoz6GWEqMPwS/MPu1z/ircG7b7iDekbIbaUrGs/dTqGB1CU+pvBWrdv1C rUFex38ytYAAVNXVTtereBR+oNfuy6ehF+sp7+MMfCgvSB+h/kL2Vb6x9usYcT4mJ988 IhJuxqn9Hxwn4xHoTAGhemWEpONJeu4M4jgt+mU2B0iZtsUT5AG8zRhP05getICWsgZP Nk0w== X-Gm-Message-State: AKaTC00rrMauMqawEcQUxZMIqyirenDX7F2R6ShHVtJzPqCmD9QpDu+KhY8DysRBv8K2voZF X-Received: by 10.84.128.195 with SMTP id a61mr142949444pla.55.1481085761416; Tue, 06 Dec 2016 20:42:41 -0800 (PST) Received: from localhost ([122.172.43.83]) by smtp.gmail.com with ESMTPSA id d15sm38293534pfl.46.2016.12.06.20.42.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 06 Dec 2016 20:42:40 -0800 (PST) From: Viresh Kumar To: Rafael Wysocki , Viresh Kumar , Nishanth Menon , Stephen Boyd , MyungJoo Ham , Kyungmin Park Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, Vincent Guittot , Viresh Kumar Subject: [PATCH V2 09/10] PM / OPP: Don't expose srcu_head to register notifiers Date: Wed, 7 Dec 2016 10:12:05 +0530 Message-Id: X-Mailer: git-send-email 2.7.1.410.g6faf27b In-Reply-To: References: In-Reply-To: References: Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Let the OPP core provide helpers to register notifiers for any device, instead of exposing srcu_head outside of the core. Signed-off-by: Viresh Kumar Acked-by: MyungJoo Ham Reviewed-by: Stephen Boyd --- drivers/base/power/opp/core.c | 66 ++++++++++++++++++++++++++++++++----------- drivers/devfreq/devfreq.c | 26 ++--------------- include/linux/pm_opp.h | 14 ++++++--- 3 files changed, 62 insertions(+), 44 deletions(-) -- 2.7.1.410.g6faf27b -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index dfbe0610b675..074a42185819 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -1874,29 +1874,63 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq) EXPORT_SYMBOL_GPL(dev_pm_opp_disable); /** - * dev_pm_opp_get_notifier() - find notifier_head of the device with opp - * @dev: device pointer used to lookup OPP table. + * dev_pm_opp_register_notifier() - Register OPP notifier for the device + * @dev: Device for which notifier needs to be registered + * @nb: Notifier block to be registered * - * Return: pointer to notifier head if found, otherwise -ENODEV or - * -EINVAL based on type of error casted as pointer. value must be checked - * with IS_ERR to determine valid pointer or error result. + * Return: 0 on success or a negative error value. + */ +int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) +{ + struct opp_table *opp_table; + int ret; + + rcu_read_lock(); + + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) { + ret = PTR_ERR(opp_table); + goto unlock; + } + + ret = srcu_notifier_chain_register(&opp_table->srcu_head, nb); + +unlock: + rcu_read_unlock(); + + return ret; +} +EXPORT_SYMBOL(dev_pm_opp_register_notifier); + +/** + * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device + * @dev: Device for which notifier needs to be unregistered + * @nb: Notifier block to be unregistered * - * Locking: This function must be called under rcu_read_lock(). opp_table is a - * RCU protected pointer. The reason for the same is that the opp pointer which - * is returned will remain valid for use with opp_get_{voltage, freq} only while - * under the locked area. The pointer returned must be used prior to unlocking - * with rcu_read_unlock() to maintain the integrity of the pointer. + * Return: 0 on success or a negative error value. */ -struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev) +int dev_pm_opp_unregister_notifier(struct device *dev, + struct notifier_block *nb) { - struct opp_table *opp_table = _find_opp_table(dev); + struct opp_table *opp_table; + int ret; - if (IS_ERR(opp_table)) - return ERR_CAST(opp_table); /* matching type */ + rcu_read_lock(); + + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) { + ret = PTR_ERR(opp_table); + goto unlock; + } + + ret = srcu_notifier_chain_unregister(&opp_table->srcu_head, nb); - return &opp_table->srcu_head; +unlock: + rcu_read_unlock(); + + return ret; } -EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier); +EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); /* * Free OPPs either created using static entries present in DT or even the diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index a324801d6a66..b0de42972b74 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1260,18 +1260,7 @@ EXPORT_SYMBOL(devfreq_recommended_opp); */ int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) { - struct srcu_notifier_head *nh; - int ret = 0; - - rcu_read_lock(); - nh = dev_pm_opp_get_notifier(dev); - if (IS_ERR(nh)) - ret = PTR_ERR(nh); - rcu_read_unlock(); - if (!ret) - ret = srcu_notifier_chain_register(nh, &devfreq->nb); - - return ret; + return dev_pm_opp_register_notifier(dev, &devfreq->nb); } EXPORT_SYMBOL(devfreq_register_opp_notifier); @@ -1287,18 +1276,7 @@ EXPORT_SYMBOL(devfreq_register_opp_notifier); */ int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) { - struct srcu_notifier_head *nh; - int ret = 0; - - rcu_read_lock(); - nh = dev_pm_opp_get_notifier(dev); - if (IS_ERR(nh)) - ret = PTR_ERR(nh); - rcu_read_unlock(); - if (!ret) - ret = srcu_notifier_chain_unregister(nh, &devfreq->nb); - - return ret; + return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); } EXPORT_SYMBOL(devfreq_unregister_opp_notifier); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 7483ff291a8e..66a02deeb03f 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -108,7 +108,9 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq); int dev_pm_opp_disable(struct device *dev, unsigned long freq); -struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev); +int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb); +int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb); + int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count); void dev_pm_opp_put_supported_hw(struct device *dev); @@ -202,10 +204,14 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq) return 0; } -static inline struct srcu_notifier_head *dev_pm_opp_get_notifier( - struct device *dev) +static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) { - return ERR_PTR(-ENOTSUPP); + return -ENOTSUPP; +} + +static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb) +{ + return -ENOTSUPP; } static inline int dev_pm_opp_set_supported_hw(struct device *dev,