From patchwork Fri Sep 28 21:52:49 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: 187907 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 439662C00B6 for ; Sat, 29 Sep 2012 07:50:51 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965146Ab2I1Vup (ORCPT ); Fri, 28 Sep 2012 17:50:45 -0400 Received: from ogre.sisk.pl ([193.178.161.156]:50862 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423150Ab2I1Vuh (ORCPT ); Fri, 28 Sep 2012 17:50:37 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by ogre.sisk.pl (Postfix) with ESMTP id 024021DC752; Fri, 28 Sep 2012 23:46:58 +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 28357-01; 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 8BED51DC6EC; Fri, 28 Sep 2012 23:46:36 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PM list Subject: [RFD][PATCH 2/7] PM / QoS: Introduce request and constraint data types for PM QoS flags Date: Fri, 28 Sep 2012 23:52:49 +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: <201209282352.49615.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 Introduce struct pm_qos_flags_request and struct pm_qos_flags representing PM QoS flags request type and PM QoS flags constraint type, respectively. With these definitions the data structures will be arranged so that the list member of a struct pm_qos_flags object will contain the head of a list of struct pm_qos_flags_request objects representing all of the "flags" requests present for the given device. Then, the effective_flags member of a struct pm_qos_flags object will contain the bitwise OR of the flags members of all the struct pm_qos_flags_request objects in the list. Additionally, introduce helper function pm_qos_update_flags() allowing the caller to manage the list of struct pm_qos_flags_request pointed to by the list member of struct pm_qos_flags. The flags are of type s32 so that the request's "value" field is always of the same type regardless of what kind of request it is (latency requests already have value fields of type s32). Signed-off-by: Rafael J. Wysocki --- include/linux/pm_qos.h | 17 +++++++++++-- kernel/power/qos.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+), 2 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_qos.h =================================================================== --- linux.orig/include/linux/pm_qos.h +++ linux/include/linux/pm_qos.h @@ -33,6 +33,11 @@ struct pm_qos_request { struct delayed_work work; /* for pm_qos_update_request_timeout */ }; +struct pm_qos_flags_request { + struct list_head node; + s32 flags; /* Do not change to 64 bit */ +}; + struct dev_pm_qos_request { struct plist_node node; struct device *dev; @@ -45,8 +50,8 @@ enum pm_qos_type { }; /* - * Note: The lockless read path depends on the CPU accessing - * target_value atomically. Atomic access is only guaranteed on all CPU + * Note: The lockless read path depends on the CPU accessing target_value + * or effective_flags atomically. Atomic access is only guaranteed on all CPU * types linux supports for 32 bit quantites */ struct pm_qos_constraints { @@ -57,6 +62,11 @@ struct pm_qos_constraints { struct blocking_notifier_head *notifiers; }; +struct pm_qos_flags { + struct list_head list; + s32 effective_flags; /* Do not change to 64 bit */ +}; + struct dev_pm_qos { struct pm_qos_constraints latency; }; @@ -75,6 +85,9 @@ static inline int dev_pm_qos_request_act 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, + struct pm_qos_flags_request *req, + enum pm_qos_req_action action, s32 val); void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class, s32 value); void pm_qos_update_request(struct pm_qos_request *req, Index: linux/kernel/power/qos.c =================================================================== --- linux.orig/kernel/power/qos.c +++ linux/kernel/power/qos.c @@ -213,6 +213,69 @@ int pm_qos_update_target(struct pm_qos_c } /** + * pm_qos_flags_remove_req - Remove device PM QoS flags request. + * @f: Device PM QoS flags set to remove the request from. + * @req: Request to remove from the set. + */ +static void pm_qos_flags_remove_req(struct pm_qos_flags *pqf, + struct pm_qos_flags_request *req) +{ + s32 val = 0; + + list_del(&req->node); + list_for_each_entry(req, &pqf->list, node) + val |= req->flags; + + pqf->effective_flags = val; +} + +/** + * pm_qos_update_flags - Update a set of PM QoS flags. + * @pqf: Set of flags to update. + * @req: Request to add to the set, to modify, or to remove from the set. + * @action: Action to take on the set. + * @val: Value of the request to add or modify. + * + * Update the given set of PM QoS flags and call notifiers if the aggregate + * value has changed. Returns 1 if the aggregate constraint value has changed, + * 0 otherwise. + */ +bool pm_qos_update_flags(struct pm_qos_flags *pqf, + struct pm_qos_flags_request *req, + enum pm_qos_req_action action, s32 val) +{ + unsigned long irqflags; + s32 prev_value, curr_value; + + spin_lock_irqsave(&pm_qos_lock, irqflags); + + prev_value = list_empty(&pqf->list) ? 0 : pqf->effective_flags; + + switch (action) { + case PM_QOS_REMOVE_REQ: + pm_qos_flags_remove_req(pqf, req); + break; + case PM_QOS_UPDATE_REQ: + pm_qos_flags_remove_req(pqf, req); + case PM_QOS_ADD_REQ: + req->flags = val; + INIT_LIST_HEAD(&req->node); + list_add_tail(&req->node, &pqf->list); + pqf->effective_flags |= val; + break; + default: + /* no action */ + ; + } + + curr_value = list_empty(&pqf->list) ? 0 : pqf->effective_flags; + + spin_unlock_irqrestore(&pm_qos_lock, irqflags); + + return prev_value != curr_value; +} + +/** * pm_qos_request - returns current system wide qos expectation * @pm_qos_class: identification of which qos value is requested *