From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941103AbdDTEpz (ORCPT ); Thu, 20 Apr 2017 00:45:55 -0400 Received: from mail-io0-f177.google.com ([209.85.223.177]:33012 "EHLO mail-io0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935114AbdDTEpy (ORCPT ); Thu, 20 Apr 2017 00:45:54 -0400 From: Viresh Kumar To: Rafael Wysocki , ulf.hansson@linaro.org, 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 V5 3/9] PM / QOS: Keep common notifier list for genpd constraints Date: Thu, 20 Apr 2017 10:15:34 +0530 Message-Id: X-Mailer: git-send-email 2.12.0.432.g71c3a4f4ba37 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Only the resume_latency constraint uses the notifiers right now. In order to prepare for adding new constraint types with notifiers, move to a common notifier list. Update pm_qos_update_target() to pass a pointer to the constraint structure to the notifier callbacks. Also update the notifier callbacks as well to error out for unexpected constraints. Signed-off-by: Viresh Kumar Acked-by: Ulf Hansson --- V4->V5: - s/__resume_latency_notifier/genpd_latency_notifier - drop "notifier" from dev_pm_qos_notifier_is_resume_latency drivers/base/power/domain.c | 26 +++++++++++++++++++------- drivers/base/power/qos.c | 15 ++++----------- include/linux/pm_qos.h | 7 +++++++ kernel/power/qos.c | 2 +- 4 files changed, 31 insertions(+), 19 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index da49a8383dc3..f6f616ac5cc2 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -426,14 +426,10 @@ static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) return ret; } -static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, - unsigned long val, void *ptr) +static int genpd_latency_notifier(struct generic_pm_domain_data *gpd_data, + unsigned long val) { - struct generic_pm_domain_data *gpd_data; - struct device *dev; - - gpd_data = container_of(nb, struct generic_pm_domain_data, nb); - dev = gpd_data->base.dev; + struct device *dev = gpd_data->base.dev; for (;;) { struct generic_pm_domain *genpd; @@ -466,6 +462,22 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, return NOTIFY_DONE; } +static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, + unsigned long val, void *ptr) +{ + struct generic_pm_domain_data *gpd_data; + struct device *dev; + + gpd_data = container_of(nb, struct generic_pm_domain_data, nb); + dev = gpd_data->base.dev; + + if (dev_pm_qos_is_resume_latency(dev, ptr)) + return genpd_latency_notifier(gpd_data, val); + + dev_err(dev, "%s: Unexpected notifier call\n", __func__); + return NOTIFY_BAD; +} + /** * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. * @work: Work structure used for scheduling the execution of this function. diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index f850daeffba4..654d8a12c2e7 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -172,18 +172,12 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) { struct dev_pm_qos *qos; struct pm_qos_constraints *c; - struct blocking_notifier_head *n; qos = kzalloc(sizeof(*qos), GFP_KERNEL); if (!qos) return -ENOMEM; - n = kzalloc(sizeof(*n), GFP_KERNEL); - if (!n) { - kfree(qos); - return -ENOMEM; - } - BLOCKING_INIT_NOTIFIER_HEAD(n); + BLOCKING_INIT_NOTIFIER_HEAD(&qos->notifiers); c = &qos->resume_latency; plist_head_init(&c->list); @@ -191,7 +185,7 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE; c->no_constraint_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE; c->type = PM_QOS_MIN; - c->notifiers = n; + c->notifiers = &qos->notifiers; c = &qos->latency_tolerance; plist_head_init(&c->list); @@ -268,7 +262,6 @@ void dev_pm_qos_constraints_destroy(struct device *dev) dev->power.qos = ERR_PTR(-ENODEV); spin_unlock_irq(&dev->power.lock); - kfree(qos->resume_latency.notifiers); kfree(qos); out: @@ -487,7 +480,7 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier) ret = dev_pm_qos_constraints_allocate(dev); if (!ret) - ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers, + ret = blocking_notifier_chain_register(&dev->power.qos->notifiers, notifier); mutex_unlock(&dev_pm_qos_mtx); @@ -514,7 +507,7 @@ int dev_pm_qos_remove_notifier(struct device *dev, /* Silently return if the constraints object is not present. */ if (!IS_ERR_OR_NULL(dev->power.qos)) - retval = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers, + retval = blocking_notifier_chain_unregister(&dev->power.qos->notifiers, notifier); mutex_unlock(&dev_pm_qos_mtx); diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 032b55909145..e546d1a2f237 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -100,6 +100,7 @@ struct dev_pm_qos { struct dev_pm_qos_request *resume_latency_req; struct dev_pm_qos_request *latency_tolerance_req; struct dev_pm_qos_request *flags_req; + struct blocking_notifier_head notifiers; /* common for all constraints */ }; /* Action requested to pm_qos_update_target */ @@ -114,6 +115,12 @@ static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req) return req->dev != NULL; } +static inline bool dev_pm_qos_is_resume_latency(struct device *dev, + struct pm_qos_constraints *c) +{ + return &dev->power.qos->resume_latency == c; +} + int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node, enum pm_qos_req_action action, int value); bool pm_qos_update_flags(struct pm_qos_flags *pqf, diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 97b0df71303e..073324e0c3c8 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -315,7 +315,7 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node, if (c->notifiers) blocking_notifier_call_chain(c->notifiers, (unsigned long)curr_value, - NULL); + c); } else { ret = 0; } -- 2.12.0.432.g71c3a4f4ba37