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[209.85.220.65]) by mx.google.com with SMTPS id k13sor7377718lji.32.2019.02.26.06.54.34 for (Google Transport Security); Tue, 26 Feb 2019 06:54:34 -0800 (PST) Received-SPF: pass (google.com: domain of ulf.hansson@linaro.org designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=frjy6udQ; spf=pass (google.com: domain of ulf.hansson@linaro.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=ulf.hansson@linaro.org 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; bh=lS99QcFML7dLoSt8lbXdQh9xfwG03Z7ZZ1t/PX5xDuw=; b=frjy6udQ0V45QAlGWn2RK3H4Qay0Dq+k1iLA9pvVtEOGvBZCfN60TFwRiT+YU2SxLu ozUVLsugwcY7ngfHpTJ4PwxYhEfL90HWT+cGtTXd6zplHUVZpeIy4GFUP1jOOA35iD+6 JydHeDM6KJ4ozjrCjQq5V+82FtAv96rciaaKZvbbxNLkKlUT9qXNy1VUbXobZ1bLKAIP GTCl3rXYTnHQSHmmAd/v4j4QaTSpdT4efyPqQNURA9tOqjkuHaCLN01+QeFrQNlu0S8i JsWN2u/aSHSzwJEPHdnzDnfFsSMisvbXCqepOSYnEV9aTOkO8Sdm54rRJWOSOkBrd1Dn MP8w== 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; bh=lS99QcFML7dLoSt8lbXdQh9xfwG03Z7ZZ1t/PX5xDuw=; b=f3S4PVLUqz/DCshTxKfQBAkp9X8ltKwpmd59+m6hjyD7jltvT9SCSds7LwU6g+3eoN HJLDK876uMFzRclJfErvPTbZFOGVuFlwNVll2IHrN/HOkPxICT7Mmm9HR6g9T38LO+sn ZcaE75lvAEipC+oisAYJ5pf8CDM8GPbLxNvEk4SlzOe2KzaqDF2/5Zl0Jh2DlvwR+WI6 bjcUlU2YqftzYeP9/vvZgeVqWFa7+v45A1UiB7ObclwS6ZkJM7vX9yG+Yz8f/YrFHP7C NbNyq5HK4Yx0eegmJhTdt93UdmXCW4+I2X5on3SRYVzLOjk6dGuAZ7++BA+h3ObqzF75 0rHw== X-Gm-Message-State: AHQUAuYntkIVVJShe1wCgEp+RJE//4ehD+xpnc3m+oDJsEdAbLcBZJdQ Eqomz8SunyBd80blHan3v+AxOG/F X-Google-Smtp-Source: AHgI3IbQK6g/GHqoYKUC0IMwAjwvECcgXrr3eJfo/5LQs+2DB3SME1ZCcMMQEZY8/vc+STbIWIx3oQ== X-Received: by 2002:a2e:6801:: with SMTP id c1mr14658227lja.81.1551192874484; Tue, 26 Feb 2019 06:54:34 -0800 (PST) Return-Path: Received: from uffe-XPS-13-9360.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id t11sm2206554ljj.92.2019.02.26.06.54.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Feb 2019 06:54:33 -0800 (PST) From: Ulf Hansson To: "Rafael J . Wysocki" , linux-pm@vger.kernel.org Cc: Frederic Weisbecker , Thomas Gleixner , Sudeep Holla , Lorenzo Pieralisi , Mark Rutland , Daniel Lezcano , "Raju P . L . S . S . S . N" , Stephen Boyd , Tony Lindgren , Kevin Hilman , Lina Iyer , Ulf Hansson , Viresh Kumar , Vincent Guittot , Geert Uytterhoeven , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v11 2/8] PM / Domains: Add support for CPU devices to genpd Date: Tue, 26 Feb 2019 15:54:09 +0100 Message-Id: <20190226145415.19411-3-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190226145415.19411-1-ulf.hansson@linaro.org> References: <20190226145415.19411-1-ulf.hansson@linaro.org> To enable a device belonging to a CPU to be attached to a PM domain managed by genpd, let's do a few changes to it, as to make it convenient to manage the specifics around CPUs. To be able to quickly find out what CPUs that are attached to a genpd, which typically becomes useful from a genpd governor as following changes is about to show, let's add a cpumask to the struct generic_pm_domain. At the point when a CPU device gets attached to a genpd, let's update the genpd's cpumask. Moreover, let's also propagate changes to the cpumask upwards in the topology to the master PM domains. In this way, the cpumask for a genpd hierarchically reflects all CPUs attached to the topology below it. Finally, let's make this an opt-in feature, to avoid having to manage CPUs and the cpumask for a genpd that doesn't need it. For that reason, let's add a new genpd configuration bit, GENPD_FLAG_CPU_DOMAIN. Cc: Lina Iyer Co-developed-by: Lina Iyer Acked-by: Rafael J. Wysocki Signed-off-by: Ulf Hansson --- Changes in v11: - None. --- drivers/base/power/domain.c | 66 ++++++++++++++++++++++++++++++++++++- include/linux/pm_domain.h | 13 ++++++++ 2 files changed, 78 insertions(+), 1 deletion(-) -- 2.17.1 diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 03885c003c6a..da10052e6427 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "power.h" @@ -126,6 +127,7 @@ static const struct genpd_lock_ops genpd_spin_ops = { #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) +#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, const struct generic_pm_domain *genpd) @@ -1452,6 +1454,56 @@ static void genpd_free_dev_data(struct device *dev, dev_pm_put_subsys_data(dev); } +static void __genpd_update_cpumask(struct generic_pm_domain *genpd, + int cpu, bool set, unsigned int depth) +{ + struct gpd_link *link; + + if (!genpd_is_cpu_domain(genpd)) + return; + + list_for_each_entry(link, &genpd->slave_links, slave_node) { + struct generic_pm_domain *master = link->master; + + genpd_lock_nested(master, depth + 1); + __genpd_update_cpumask(master, cpu, set, depth + 1); + genpd_unlock(master); + } + + if (set) + cpumask_set_cpu(cpu, genpd->cpus); + else + cpumask_clear_cpu(cpu, genpd->cpus); +} + +static void genpd_update_cpumask(struct generic_pm_domain *genpd, + struct device *dev, bool set) +{ + int cpu; + + if (!genpd_is_cpu_domain(genpd)) + return; + + for_each_possible_cpu(cpu) { + if (get_cpu_device(cpu) == dev) { + __genpd_update_cpumask(genpd, cpu, set, 0); + return; + } + } +} + +static void genpd_set_cpumask(struct generic_pm_domain *genpd, + struct device *dev) +{ + genpd_update_cpumask(genpd, dev, true); +} + +static void genpd_clear_cpumask(struct generic_pm_domain *genpd, + struct device *dev) +{ + genpd_update_cpumask(genpd, dev, false); +} + static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, struct gpd_timing_data *td) { @@ -1473,6 +1525,8 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, if (ret) goto out; + genpd_set_cpumask(genpd, dev); + dev_pm_domain_set(dev, &genpd->domain); genpd->device_count++; @@ -1534,6 +1588,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd, if (genpd->detach_dev) genpd->detach_dev(genpd, dev); + genpd_clear_cpumask(genpd, dev); dev_pm_domain_set(dev, NULL); list_del_init(&pdd->list_node); @@ -1767,11 +1822,18 @@ int pm_genpd_init(struct generic_pm_domain *genpd, if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) return -EINVAL; + if (genpd_is_cpu_domain(genpd) && + !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) + return -ENOMEM; + /* Use only one "off" state if there were no states declared */ if (genpd->state_count == 0) { ret = genpd_set_default_power_state(genpd); - if (ret) + if (ret) { + if (genpd_is_cpu_domain(genpd)) + free_cpumask_var(genpd->cpus); return ret; + } } else if (!gov) { pr_warn("%s : no governor for states\n", genpd->name); } @@ -1817,6 +1879,8 @@ static int genpd_remove(struct generic_pm_domain *genpd) list_del(&genpd->gpd_list_node); genpd_unlock(genpd); cancel_work_sync(&genpd->power_off_work); + if (genpd_is_cpu_domain(genpd)) + free_cpumask_var(genpd->cpus); if (genpd->free_states) genpd->free_states(genpd->states, genpd->state_count); diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 8e1399231753..a6e251fe9deb 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -16,6 +16,7 @@ #include #include #include +#include /* * Flags to control the behaviour of a genpd. @@ -42,11 +43,22 @@ * GENPD_FLAG_ACTIVE_WAKEUP: Instructs genpd to keep the PM domain powered * on, in case any of its attached devices is used * in the wakeup path to serve system wakeups. + * + * GENPD_FLAG_CPU_DOMAIN: Instructs genpd that it should expect to get + * devices attached, which may belong to CPUs or + * possibly have subdomains with CPUs attached. + * This flag enables the genpd backend driver to + * deploy idle power management support for CPUs + * and groups of CPUs. Note that, the backend + * driver must then comply with the so called, + * last-man-standing algorithm, for the CPUs in the + * PM domain. */ #define GENPD_FLAG_PM_CLK (1U << 0) #define GENPD_FLAG_IRQ_SAFE (1U << 1) #define GENPD_FLAG_ALWAYS_ON (1U << 2) #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3) +#define GENPD_FLAG_CPU_DOMAIN (1U << 4) enum gpd_status { GPD_STATE_ACTIVE = 0, /* PM domain is active */ @@ -94,6 +106,7 @@ struct generic_pm_domain { unsigned int suspended_count; /* System suspend device counter */ unsigned int prepared_count; /* Suspend counter of prepared devices */ unsigned int performance_state; /* Aggregated max performance state */ + cpumask_var_t cpus; /* A cpumask of the attached CPUs */ int (*power_off)(struct generic_pm_domain *domain); int (*power_on)(struct generic_pm_domain *domain); struct opp_table *opp_table; /* OPP table of the genpd */