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[209.132.180.67]) by mx.google.com with ESMTP id y20si25067519pfj.343.2017.04.26.03.59.15; Wed, 26 Apr 2017 03:59:16 -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 S2999054AbdDZK7O (ORCPT + 17 others); Wed, 26 Apr 2017 06:59:14 -0400 Received: from mail-pf0-f173.google.com ([209.85.192.173]:33586 "EHLO mail-pf0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2998902AbdDZK5s (ORCPT ); Wed, 26 Apr 2017 06:57:48 -0400 Received: by mail-pf0-f173.google.com with SMTP id a188so40693989pfa.0 for ; Wed, 26 Apr 2017 03:57:48 -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=sosoBv3Aw/pOkif+KVGq8NtmxVPmr+k3pCiDotsR/Vk=; b=YPXg2QjQdY5k1VzhQ+hMxaTGLHqWn77v6HQdzVY8eQ0THnXH0KcN6vjreCL0ZF4umL zy33FqoZWfoJG1a244qTyqEe0XwAwLlBgtP17QRXodrhhvhs8oTWWh/u6wTGtytCeeSD q9ThH+vKCd25cq+Pyca1r2r5IxkDi33t0NFJQ= 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=sosoBv3Aw/pOkif+KVGq8NtmxVPmr+k3pCiDotsR/Vk=; b=rO/Z9lFurXWSa8LgRj+Eyzbs5gjGuOlXEND2mW7Qrnt1g84TPTmjg62wNzTpQ2FXcy bzWLO06LMN+zJgmVModoZ8u4jLq/9bpY8+IJE7JFqXAQ7o8zDnFNZKGwQxE3BFD8eDBG 68zO1gGC+BA1FWN+/DCEwYsHGakOE0xFU40P3OkjkxBf2ukL+3cfO5PEkjlMEdlC+jwx lzuCp7gz6/6ubdTLZAF14i3sMPwK6A+s9V6vvWTub61S/9SceuSEOihRiM9gIy19tGOm Snu/BPVwHg6vv6vqqmIu7WBxZGUEZ7Qw8QlSw4eFeLEdhv4FoIN2a8KxHCAOVSWrB7Od 4nQg== X-Gm-Message-State: AN3rC/5RIrvg0aS3M0rJRtihu9UR3be3ITcK5xaO6q2/uWIkFYDykvnN Q63V0kb2bZy0rqVy4ERAPA== X-Received: by 10.84.171.129 with SMTP id l1mr43256029plb.5.1493204267557; Wed, 26 Apr 2017 03:57:47 -0700 (PDT) Received: from localhost ([122.172.121.5]) by smtp.gmail.com with ESMTPSA id y29sm41815248pfj.90.2017.04.26.03.57.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Apr 2017 03:57:46 -0700 (PDT) From: Viresh Kumar To: Rafael Wysocki , ulf.hansson@linaro.org, Kevin Hilman , Len Brown , Pavel Machek 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, sudeep.holla@arm.com, Viresh Kumar Subject: [PATCH V6 7/9] PM / domain: Register PM QOS performance notifier Date: Wed, 26 Apr 2017 16:27:11 +0530 Message-Id: <88fdc938b61ae97d2bc705bc01e3f8ad0db79e56.1493203884.git.viresh.kumar@linaro.org> 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 f6f616ac5cc2..7d35dafe8c97 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -462,6 +462,79 @@ static int genpd_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) { @@ -474,6 +547,9 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, if (dev_pm_qos_is_resume_latency(dev, ptr)) return genpd_latency_notifier(gpd_data, val); + if (dev_pm_qos_is_performance(dev, ptr)) + return __performance_notifier(gpd_data, val); + dev_err(dev, "%s: Unexpected notifier call\n", __func__); return NOTIFY_BAD; } @@ -1168,6 +1244,7 @@ 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 b7803a251044..84ee474e66d0 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -63,8 +63,11 @@ 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; @@ -118,6 +121,7 @@ struct generic_pm_domain_data { struct pm_domain_data base; struct gpd_timing_data td; struct notifier_block nb; + unsigned int performance_state; void *data; };