From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74E6EC433DF for ; Thu, 4 Jun 2020 01:53:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4ED8D20772 for ; Thu, 4 Jun 2020 01:53:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="TTHUNmNT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728020AbgFDBxZ (ORCPT ); Wed, 3 Jun 2020 21:53:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727113AbgFDBxW (ORCPT ); Wed, 3 Jun 2020 21:53:22 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D091C08C5C2 for ; Wed, 3 Jun 2020 18:53:22 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id c12so4458904qkk.13 for ; Wed, 03 Jun 2020 18:53:22 -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 :mime-version:content-transfer-encoding; bh=OXFBxnWXYnn/70SvWtr9K2MHoufkLsFwRRiIi6zZBfk=; b=TTHUNmNTBK6ssrGE4vNIHuoGl36/IKA184BiSEt8dXIB0bXbrx0XulkgtaLviqMvuW tiIHAKyJPYZreacCzAGf8kljq9QG3N1PG/bNUFHp6FKanpARhYnd1lj2lOa6FWJptBym L3dMIgXoBnK89BgeVPpe8GHacwrkCx5LaXP0Aq0Xj0HBxajAOPuALcf5U/FjaB+Z1voT vf9KlCpD5m6T105XsMMrDnc2eE2+NRpCmzy6IkeydAUxAPeb6uqYMzZgBWZcU5IkBZgX EYrGk3+RyAqITb8mgfYGzzvQrK11Ct5wGRbMIFnMdg3+5dZJ1/4HOLZ606IzJqO/iePB GkYg== 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:mime-version:content-transfer-encoding; bh=OXFBxnWXYnn/70SvWtr9K2MHoufkLsFwRRiIi6zZBfk=; b=Yj3opGjibxHF7krxDi47TyMdZzUDfLNw2Ee7M9oLusq9t4rnweYOQlQC8B5VQE5Upy ceV+28BxvIep1gz9NFmv81v/nqHaZHeHNfrqAX/6IBYLk1QTDeAVn6vtnIit3iBNOyHM SqF842zyq3KnNpf2IaBmNc3svMnPGTkdj1BzfX+ll75FsJ6UQV7HexJ2J/C/AKM+5g7z PihwoxzJ6rwe6qQ7mfx2WtRKkm5oF6gMyDis4F6es8VM1iTQi+eJCkYDaIfBySxFYb3k BIvSmxiY9BZiGZxGFpZp/6V0heHU7v8CXEg3grzrSszQ2E/EtaxpbWcJzwAkz+B4vAfD AfDg== X-Gm-Message-State: AOAM530byFd+NDT23BMik+wD4Ymxk+LbPz5Efr1QCXci9g8uw8uggW6A J0vaugTSJqPtCAtT854eXDCHOg== X-Google-Smtp-Source: ABdhPJxtYPvU4sjsI6bm1cB56yIjkZm4HSRbup9Y6NQzxcUlyQ8iJvQmJ9f/YKDFoggQ1o/Vl5DgyA== X-Received: by 2002:a05:620a:15a5:: with SMTP id f5mr2710795qkk.9.1591235601365; Wed, 03 Jun 2020 18:53:21 -0700 (PDT) Received: from pop-os.fios-router.home (pool-71-255-246-27.washdc.fios.verizon.net. [71.255.246.27]) by smtp.googlemail.com with ESMTPSA id t74sm2986439qka.21.2020.06.03.18.53.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2020 18:53:19 -0700 (PDT) From: Thara Gopinath To: rui.zhang@intel.com, ulf.hansson@linaro.org, daniel.lezcano@linaro.org, bjorn.andersson@linaro.org, agross@kernel.org, robh@kernel.org Cc: amit.kucheria@verdurent.com, mark.rutland@arm.com, rjw@rjwysocki.net, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 1/6] PM/Domains: Add support for retrieving genpd performance states information Date: Wed, 3 Jun 2020 21:53:12 -0400 Message-Id: <20200604015317.31389-2-thara.gopinath@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200604015317.31389-1-thara.gopinath@linaro.org> References: <20200604015317.31389-1-thara.gopinath@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add two new APIs in the genpd framework, dev_pm_genpd_get_performance_state to return the current performance state of a power domain and dev_pm_genpd_performance_state_count to return the total number of performance states supported by a power domain. Since the genpd framework does not maintain a count of number of performance states supported by a power domain, introduce a new callback(.get_performance_state_count) that can be used to retrieve this information from power domain drivers. These APIs are added to aid the implementation of a power domain as a warming device. Linux kernel cooling device framework(into which warming device can be plugged in) requires during initialization to be provided with the maximum number of states that can be supported. When a power domain acts as a warming device, the max state is the max number of perfomrance states supported by the power domain. The cooling device framework implements API to retrieve the current state of the cooling device. This in turn translates to the current performance state of the power domain. Signed-off-by: Thara Gopinath Reviewed-by: Ulf Hansson Reviewed-by: Bjorn Andersson --- drivers/base/power/domain.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 13 +++++++++++++ 2 files changed, 50 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 0a01df608849..88f8773cabe7 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -408,6 +408,43 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) } EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); +int dev_pm_genpd_get_performance_state(struct device *dev) +{ + struct generic_pm_domain *genpd; + unsigned int state; + + genpd = dev_to_genpd_safe(dev); + if (IS_ERR(genpd)) + return -ENODEV; + + genpd_lock(genpd); + state = genpd->performance_state; + genpd_unlock(genpd); + + return state; +} +EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state); + +int dev_pm_genpd_performance_state_count(struct device *dev) +{ + struct generic_pm_domain *genpd; + int count; + + genpd = dev_to_genpd_safe(dev); + if (IS_ERR(genpd)) + return -ENODEV; + + if (unlikely(!genpd->get_performance_state_count)) + return -EINVAL; + + genpd_lock(genpd); + count = genpd->get_performance_state_count(genpd); + genpd_unlock(genpd); + + return count; +} +EXPORT_SYMBOL_GPL(dev_pm_genpd_performance_state_count); + static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) { unsigned int state_idx = genpd->state_idx; diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 9ec78ee53652..7d415350380f 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -117,6 +117,7 @@ struct generic_pm_domain { struct dev_pm_opp *opp); int (*set_performance_state)(struct generic_pm_domain *genpd, unsigned int state); + int (*get_performance_state_count)(struct generic_pm_domain *genpd); struct gpd_dev_ops dev_ops; s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ bool max_off_time_changed; @@ -204,6 +205,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd, struct dev_power_governor *gov, bool is_off); int pm_genpd_remove(struct generic_pm_domain *genpd); int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state); +int dev_pm_genpd_get_performance_state(struct device *dev); +int dev_pm_genpd_performance_state_count(struct device *dev); extern struct dev_power_governor simple_qos_governor; extern struct dev_power_governor pm_domain_always_on_gov; @@ -251,6 +254,16 @@ static inline int dev_pm_genpd_set_performance_state(struct device *dev, return -ENOTSUPP; } +static inline int dev_pm_genpd_get_performance_state(struct device *dev) +{ + return -ENOTSUPP; +} + +static inline int dev_pm_genpd_performance_state_count(struct device *dev) +{ + return -ENOTSUPP; +} + #define simple_qos_governor (*(struct dev_power_governor *)(NULL)) #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL)) #endif -- 2.20.1