From patchwork Fri Sep 28 21:52:08 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 187904 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 88ECD2C00B6 for ; Sat, 29 Sep 2012 07:50:45 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423151Ab2I1Vui (ORCPT ); Fri, 28 Sep 2012 17:50:38 -0400 Received: from ogre.sisk.pl ([193.178.161.156]:50824 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423140Ab2I1Vuf (ORCPT ); Fri, 28 Sep 2012 17:50:35 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by ogre.sisk.pl (Postfix) with ESMTP id E04ED1DC616; Fri, 28 Sep 2012 23:46:55 +0200 (CEST) Received: from ogre.sisk.pl ([127.0.0.1]) by localhost (ogre.sisk.pl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 28039-08; Fri, 28 Sep 2012 23:46:36 +0200 (CEST) Received: from ferrari.rjw.lan (89-67-90-11.dynamic.chello.pl [89.67.90.11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ogre.sisk.pl (Postfix) with ESMTP id 6ECA21DC596; Fri, 28 Sep 2012 23:46:36 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PM list Subject: [RFD][PATCH 1/7] PM / QoS: Prepare device structure for adding more constraint types Date: Fri, 28 Sep 2012 23:52:08 +0200 User-Agent: KMail/1.13.6 (Linux/3.6.0-rc6+; KDE/4.6.0; x86_64; ; ) Cc: ACPI Devel Mailing List , Alan Stern , Huang Ying , Sarah Sharp , Lan Tianyu , Aaron Lu , Jean Pihet , linux-pci@vger.kernel.org, "Greg Kroah-Hartman" , mark gross References: <201209282351.10663.rjw@sisk.pl> In-Reply-To: <201209282351.10663.rjw@sisk.pl> MIME-Version: 1.0 Message-Id: <201209282352.08434.rjw@sisk.pl> X-Virus-Scanned: amavisd-new at ogre.sisk.pl using MkS_Vir for Linux Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Currently struct dev_pm_info contains only one PM QoS constraints pointer reserved for latency requirements. Since one more device constraints type (i.e. flags) will be necessary, introduce a new structure, struct dev_pm_qos, that eventually will contain all of the available device PM QoS constraints and replace the "constraints" pointer in struct dev_pm_info with a pointer to the new structure called "qos". Signed-off-by: Rafael J. Wysocki --- drivers/base/power/qos.c | 42 ++++++++++++++++++++++-------------------- include/linux/pm.h | 2 +- include/linux/pm_qos.h | 4 ++++ 3 files changed, 27 insertions(+), 21 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux/include/linux/pm.h =================================================================== --- linux.orig/include/linux/pm.h +++ linux/include/linux/pm.h @@ -551,7 +551,7 @@ struct dev_pm_info { struct dev_pm_qos_request *pq_req; #endif struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */ - struct pm_qos_constraints *constraints; + struct dev_pm_qos *qos; }; extern void update_pm_runtime_accounting(struct device *dev); Index: linux/include/linux/pm_qos.h =================================================================== --- linux.orig/include/linux/pm_qos.h +++ linux/include/linux/pm_qos.h @@ -57,6 +57,10 @@ struct pm_qos_constraints { struct blocking_notifier_head *notifiers; }; +struct dev_pm_qos { + struct pm_qos_constraints latency; +}; + /* Action requested to pm_qos_update_target */ enum pm_qos_req_action { PM_QOS_ADD_REQ, /* Add a new request */ Index: linux/drivers/base/power/qos.c =================================================================== --- linux.orig/drivers/base/power/qos.c +++ linux/drivers/base/power/qos.c @@ -55,9 +55,7 @@ static BLOCKING_NOTIFIER_HEAD(dev_pm_not */ s32 __dev_pm_qos_read_value(struct device *dev) { - struct pm_qos_constraints *c = dev->power.constraints; - - return c ? pm_qos_read_value(c) : 0; + return dev->power.qos ? pm_qos_read_value(&dev->power.qos->latency) : 0; } /** @@ -91,12 +89,12 @@ static int apply_constraint(struct dev_p { int ret, curr_value; - ret = pm_qos_update_target(req->dev->power.constraints, + ret = pm_qos_update_target(&req->dev->power.qos->latency, &req->node, action, value); if (ret) { /* Call the global callbacks if needed */ - curr_value = pm_qos_read_value(req->dev->power.constraints); + curr_value = pm_qos_read_value(&req->dev->power.qos->latency); blocking_notifier_call_chain(&dev_pm_notifiers, (unsigned long)curr_value, req); @@ -114,20 +112,22 @@ static int apply_constraint(struct dev_p */ 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; - c = kzalloc(sizeof(*c), GFP_KERNEL); - if (!c) + qos = kzalloc(sizeof(*qos), GFP_KERNEL); + if (!qos) return -ENOMEM; n = kzalloc(sizeof(*n), GFP_KERNEL); if (!n) { - kfree(c); + kfree(qos); return -ENOMEM; } BLOCKING_INIT_NOTIFIER_HEAD(n); + c = &qos->latency; plist_head_init(&c->list); c->target_value = PM_QOS_DEV_LAT_DEFAULT_VALUE; c->default_value = PM_QOS_DEV_LAT_DEFAULT_VALUE; @@ -135,7 +135,7 @@ static int dev_pm_qos_constraints_alloca c->notifiers = n; spin_lock_irq(&dev->power.lock); - dev->power.constraints = c; + dev->power.qos = qos; spin_unlock_irq(&dev->power.lock); return 0; @@ -151,7 +151,7 @@ static int dev_pm_qos_constraints_alloca void dev_pm_qos_constraints_init(struct device *dev) { mutex_lock(&dev_pm_qos_mtx); - dev->power.constraints = NULL; + dev->power.qos = NULL; dev->power.power_state = PMSG_ON; mutex_unlock(&dev_pm_qos_mtx); } @@ -164,6 +164,7 @@ void dev_pm_qos_constraints_init(struct */ void dev_pm_qos_constraints_destroy(struct device *dev) { + struct dev_pm_qos *qos; struct dev_pm_qos_request *req, *tmp; struct pm_qos_constraints *c; @@ -176,10 +177,11 @@ void dev_pm_qos_constraints_destroy(stru mutex_lock(&dev_pm_qos_mtx); dev->power.power_state = PMSG_INVALID; - c = dev->power.constraints; - if (!c) + qos = dev->power.qos; + if (!qos) goto out; + c = &qos->latency; /* Flush the constraints list for the device */ plist_for_each_entry_safe(req, tmp, &c->list, node) { /* @@ -191,7 +193,7 @@ void dev_pm_qos_constraints_destroy(stru } spin_lock_irq(&dev->power.lock); - dev->power.constraints = NULL; + dev->power.qos = NULL; spin_unlock_irq(&dev->power.lock); kfree(c->notifiers); @@ -235,7 +237,7 @@ int dev_pm_qos_add_request(struct device mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.constraints) { + if (!dev->power.qos) { if (dev->power.power_state.event == PM_EVENT_INVALID) { /* The device has been removed from the system. */ req->dev = NULL; @@ -290,7 +292,7 @@ int dev_pm_qos_update_request(struct dev mutex_lock(&dev_pm_qos_mtx); - if (req->dev->power.constraints) { + if (req->dev->power.qos) { if (new_value != req->node.prio) ret = apply_constraint(req, PM_QOS_UPDATE_REQ, new_value); @@ -329,7 +331,7 @@ int dev_pm_qos_remove_request(struct dev mutex_lock(&dev_pm_qos_mtx); - if (req->dev->power.constraints) { + if (req->dev->power.qos) { ret = apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); memset(req, 0, sizeof(*req)); @@ -362,13 +364,13 @@ int dev_pm_qos_add_notifier(struct devic mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.constraints) + if (!dev->power.qos) ret = dev->power.power_state.event != PM_EVENT_INVALID ? dev_pm_qos_constraints_allocate(dev) : -ENODEV; if (!ret) ret = blocking_notifier_chain_register( - dev->power.constraints->notifiers, notifier); + dev->power.qos->latency.notifiers, notifier); mutex_unlock(&dev_pm_qos_mtx); return ret; @@ -393,9 +395,9 @@ int dev_pm_qos_remove_notifier(struct de mutex_lock(&dev_pm_qos_mtx); /* Silently return if the constraints object is not present. */ - if (dev->power.constraints) + if (dev->power.qos) retval = blocking_notifier_chain_unregister( - dev->power.constraints->notifiers, + dev->power.qos->latency.notifiers, notifier); mutex_unlock(&dev_pm_qos_mtx);