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[209.132.180.67]) by mx.google.com with ESMTP id z190si11979390pfb.188.2017.03.20.02.33.32; Mon, 20 Mar 2017 02:33:32 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753772AbdCTJdc (ORCPT + 23 others); Mon, 20 Mar 2017 05:33:32 -0400 Received: from mail-pg0-f42.google.com ([74.125.83.42]:34621 "EHLO mail-pg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753325AbdCTJcu (ORCPT ); Mon, 20 Mar 2017 05:32:50 -0400 Received: by mail-pg0-f42.google.com with SMTP id 21so41261540pgg.1 for ; Mon, 20 Mar 2017 02:32:49 -0700 (PDT) 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=UDDIGanfDgPJu9k4o6CjScW8F8Q7MStcB/l3rPpHtE0=; b=eD7cN4dEi72ahE/fyOo8kXbC1mSz2lSxHSTnWqyY7ACTOSb/3+6Fo4EDm6bS3QbbjA +mOKIgN1X4HieTf7Rt9u28XQHasbj0kWrAoATcKMJzVyC7uGHBtvkrWc7DlxTnRUOTOO 5fIUjFvjWeRiE/vu3prOffZfd26V6hbwbYxZY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=UDDIGanfDgPJu9k4o6CjScW8F8Q7MStcB/l3rPpHtE0=; b=O5LA1ShGDQhtn00TItP9v9yfQusYVcSbXCdwesCCloxp+t+omm0n6xBQ8UUn4Q/SvR bGRuNveRrJuHtwoxZ1FDgcdbtJZynrs/Gvk9cyiKyhg1cXr2Wy9se1CwSRw3HtiY8YTY UZBg8c2wdklBd7ZKMaJ37NQ4yobR8GgfnReWp5Kvr8ph5DCVW23FZSZsTCqn1NAkDqkF BZbqhSC4u1+K/Ubiia9te0PnskV1Dh5NLy+chgMsHUXQJzagiQ9S1oyj4cC7Flpt9vW3 9iNqJgFeqWgrH6zg6uOO3QiiNFFuyFyrVxJA9vptrKfYOqTWc+VIaIvCfZfmxehRqBrm mNqA== X-Gm-Message-State: AFeK/H0JOah4yMoTGmqah4j2shW0euwWZlHQPmHbBhN/k8LvjKMLYu1liYFATyRGhKBHmPOA X-Received: by 10.99.66.193 with SMTP id p184mr30073145pga.213.1490002368671; Mon, 20 Mar 2017 02:32:48 -0700 (PDT) Received: from localhost ([122.171.239.200]) by smtp.gmail.com with ESMTPSA id l29sm22031526pfb.118.2017.03.20.02.32.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 Mar 2017 02:32:48 -0700 (PDT) From: Viresh Kumar To: Rafael Wysocki , ulf.hansson@linaro.org, Kevin Hilman , Kevin Hilman , Pavel Machek , Len Brown Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Vincent Guittot , Stephen Boyd , Nishanth Menon , robh+dt@kernel.org, lina.iyer@linaro.org, rnayak@codeaurora.org, Viresh Kumar Subject: [PATCH V4 7/9] PM / domain: Register for PM QOS performance notifier Date: Mon, 20 Mar 2017 15:02:19 +0530 Message-Id: X-Mailer: git-send-email 2.12.0.432.g71c3a4f4ba37 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some platforms have the capability to configure the performance state of their Power Domains. The performance levels are identified by positive integer values, a lower value represents lower performance state. The power domain driver should be able to retrieve all information required to configure the performance state of the power domain, with the help of the performance constraint's target value. This patch implements performance state management in PM domain core. The performance QOS uses the common QOS notifier list and we call __performance_notifier() if the notifier is issued for performance constraint. This also allows the power domain drivers to implement a ->set_performance_state() callback, which will be called by the power domain core from within the notifier routine. If a domain doesn't implement ->set_performance_state() callback, then it is assumed that its parents are responsible for performance state configuration. Both devices and sub-domains are accounted for while finding the highest performance state requested. Signed-off-by: Viresh Kumar --- drivers/base/power/domain.c | 77 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 4 +++ 2 files changed, 81 insertions(+) -- 2.12.0.432.g71c3a4f4ba37 diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 6e4e22aa14a2..03dd7a61f08a 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -452,6 +452,79 @@ static int __resume_latency_notifier(struct generic_pm_domain_data *gpd_data, return NOTIFY_DONE; } +static void __update_domain_performance_state(struct generic_pm_domain *genpd, + int depth) +{ + struct generic_pm_domain_data *pd_data; + struct generic_pm_domain *subdomain; + struct pm_domain_data *pdd; + unsigned int state = 0; + struct gpd_link *link; + + /* Traverse all devices within the domain */ + list_for_each_entry(pdd, &genpd->dev_list, list_node) { + pd_data = to_gpd_data(pdd); + + if (pd_data->performance_state > state) + state = pd_data->performance_state; + } + + /* Traverse all subdomains within the domain */ + list_for_each_entry(link, &genpd->master_links, master_node) { + subdomain = link->slave; + + if (subdomain->performance_state > state) + state = subdomain->performance_state; + } + + if (genpd->performance_state == state) + return; + + genpd->performance_state = state; + + if (genpd->set_performance_state) { + genpd->set_performance_state(genpd, state); + return; + } + + /* Propagate to parent power domains */ + list_for_each_entry(link, &genpd->slave_links, slave_node) { + struct generic_pm_domain *master = link->master; + + genpd_lock_nested(master, depth + 1); + __update_domain_performance_state(master, depth + 1); + genpd_unlock(master); + } +} + +static int __performance_notifier(struct generic_pm_domain_data *gpd_data, + unsigned long val) +{ + struct generic_pm_domain *genpd = ERR_PTR(-ENODATA); + struct device *dev = gpd_data->base.dev; + struct pm_domain_data *pdd; + + spin_lock_irq(&dev->power.lock); + + pdd = dev->power.subsys_data ? + dev->power.subsys_data->domain_data : NULL; + + if (pdd && pdd->dev) + genpd = dev_to_genpd(dev); + + spin_unlock_irq(&dev->power.lock); + + if (IS_ERR(genpd)) + return NOTIFY_DONE; + + genpd_lock(genpd); + gpd_data->performance_state = val; + __update_domain_performance_state(genpd, 0); + genpd_unlock(genpd); + + return NOTIFY_DONE; +} + static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, unsigned long val, void *ptr) { @@ -464,6 +537,9 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, if (dev_pm_qos_notifier_is_resume_latency(dev, ptr)) return __resume_latency_notifier(gpd_data, val); + if (dev_pm_qos_notifier_is_performance(dev, ptr)) + return __performance_notifier(gpd_data, val); + dev_err(dev, "%s: Unexpected notifier call\n", __func__); return NOTIFY_BAD; } @@ -1157,6 +1233,7 @@ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, gpd_data->td.constraint_changed = true; gpd_data->td.effective_constraint_ns = -1; gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; + gpd_data->performance_state = 0; spin_lock_irq(&dev->power.lock); diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 5339ed5bd6f9..83795935709e 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -62,8 +62,11 @@ struct generic_pm_domain { unsigned int device_count; /* Number of devices */ unsigned int suspended_count; /* System suspend device counter */ unsigned int prepared_count; /* Suspend counter of prepared devices */ + unsigned int performance_state; /* Max requested performance state */ int (*power_off)(struct generic_pm_domain *domain); int (*power_on)(struct generic_pm_domain *domain); + int (*set_performance_state)(struct generic_pm_domain *domain, + unsigned int state); struct gpd_dev_ops dev_ops; s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ bool max_off_time_changed; @@ -117,6 +120,7 @@ struct generic_pm_domain_data { struct pm_domain_data base; struct gpd_timing_data td; struct notifier_block nb; + unsigned int performance_state; }; #ifdef CONFIG_PM_GENERIC_DOMAINS