From patchwork Tue Aug 16 13:43:07 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean Pihet X-Patchwork-Id: 1071582 Received: from smtp1.linux-foundation.org (smtp1.linux-foundation.org [140.211.169.13]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p7GDuDFw019987 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Tue, 16 Aug 2011 13:56:34 GMT Received: from daredevil.linux-foundation.org (localhost [127.0.0.1]) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id p7GDscgl029251; Tue, 16 Aug 2011 06:54:39 -0700 Received: from mail-ww0-f43.google.com (mail-ww0-f43.google.com [74.125.82.43]) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id p7GDhd0q027679 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=FAIL) for ; Tue, 16 Aug 2011 06:43:49 -0700 Received: by mail-ww0-f43.google.com with SMTP id 32so4865438wwe.24 for ; Tue, 16 Aug 2011 06:43:49 -0700 (PDT) Received: by 10.227.130.104 with SMTP id r40mr4477153wbs.73.1313502228547; Tue, 16 Aug 2011 06:43:48 -0700 (PDT) Received: from localhost.localdomain (189.232-245-81.adsl-dyn.isp.belgacom.be [81.245.232.189]) by mx.google.com with ESMTPS id ek1sm48288wbb.11.2011.08.16.06.43.46 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 16 Aug 2011 06:43:47 -0700 (PDT) From: jean.pihet@newoldbits.com To: Mark Brown , Kevin Hilman , markgross@thegnar.org, Linux PM mailing list , linux-omap@vger.kernel.org, "Rafael J. Wysocki" , Paul Walmsley , Magnus Damm , Todd Poynor Date: Tue, 16 Aug 2011 15:43:07 +0200 Message-Id: <1313502198-9298-5-git-send-email-j-pihet@ti.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1313502198-9298-1-git-send-email-j-pihet@ti.com> References: <1313502198-9298-1-git-send-email-j-pihet@ti.com> Received-SPF: pass (localhost is always allowed.) X-Spam-Status: No, hits=-4.014 required=5 tests=AWL, BAYES_00, OSDL_HEADER_SUBJECT_BRACKETED X-Spam-Checker-Version: SpamAssassin 3.2.4-osdl_revision__1.47__ X-MIMEDefang-Filter: lf$Revision: 1.188 $ X-Scanned-By: MIMEDefang 2.63 on 140.211.169.21 Cc: Jean Pihet Subject: [linux-pm] [PATCH 04/15] PM QoS: re-organize data structs X-BeenThere: linux-pm@lists.linux-foundation.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux power management List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-pm-bounces@lists.linux-foundation.org Errors-To: linux-pm-bounces@lists.linux-foundation.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Tue, 16 Aug 2011 13:56:34 +0000 (UTC) From: Jean Pihet In preparation for the per-device constratins support, re-organize the data strctures: - add a struct pm_qos_constraints which contains the constraints related data - update struct pm_qos_object contents to the PM QoS internal object data. Add a pointer to struct pm_qos_constraints - update the internal code to use the new data structs. Signed-off-by: Jean Pihet --- include/linux/pm_qos.h | 19 +++++++++++ kernel/power/qos.c | 85 +++++++++++++++++++++++------------------------- 2 files changed, 60 insertions(+), 44 deletions(-) diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 6b0968f..9772311 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -25,6 +25,25 @@ struct pm_qos_request { int pm_qos_class; }; +enum pm_qos_type { + PM_QOS_UNITIALIZED, + PM_QOS_MAX, /* return the largest value */ + PM_QOS_MIN /* return the smallest value */ +}; + +/* + * Note: The lockless read path depends on the CPU accessing + * target_value atomically. Atomic access is only guaranteed on all CPU + * types linux supports for 32 bit quantites + */ +struct pm_qos_constraints { + struct plist_head list; + s32 target_value; /* Do not change to 64 bit */ + s32 default_value; + enum pm_qos_type type; + struct blocking_notifier_head *notifiers; +}; + #ifdef CONFIG_PM void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class, s32 value); diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 788c4cf..4a35fe5 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -49,58 +49,53 @@ * or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock * held, taken with _irqsave. One lock to rule them all */ -enum pm_qos_type { - PM_QOS_MAX, /* return the largest value */ - PM_QOS_MIN /* return the smallest value */ -}; - -/* - * Note: The lockless read path depends on the CPU accessing - * target_value atomically. Atomic access is only guaranteed on all CPU - * types linux supports for 32 bit quantites - */ struct pm_qos_object { - struct plist_head constraints; - struct blocking_notifier_head *notifiers; + struct pm_qos_constraints *constraints; struct miscdevice pm_qos_power_miscdev; char *name; - s32 target_value; /* Do not change to 64 bit */ - s32 default_value; - enum pm_qos_type type; }; static DEFINE_SPINLOCK(pm_qos_lock); static struct pm_qos_object null_pm_qos; + static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier); -static struct pm_qos_object cpu_dma_pm_qos = { - .constraints = PLIST_HEAD_INIT(cpu_dma_pm_qos.constraints), - .notifiers = &cpu_dma_lat_notifier, - .name = "cpu_dma_latency", +static struct pm_qos_constraints cpu_dma_constraints = { + .list = PLIST_HEAD_INIT(cpu_dma_constraints.list), .target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE, .default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE, .type = PM_QOS_MIN, + .notifiers = &cpu_dma_lat_notifier, +}; +static struct pm_qos_object cpu_dma_pm_qos = { + .constraints = &cpu_dma_constraints, }; static BLOCKING_NOTIFIER_HEAD(network_lat_notifier); -static struct pm_qos_object network_lat_pm_qos = { - .constraints = PLIST_HEAD_INIT(network_lat_pm_qos.constraints), - .notifiers = &network_lat_notifier, - .name = "network_latency", +static struct pm_qos_constraints network_lat_constraints = { + .list = PLIST_HEAD_INIT(network_lat_constraints.list), .target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE, .default_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE, - .type = PM_QOS_MIN + .type = PM_QOS_MIN, + .notifiers = &network_lat_notifier, +}; +static struct pm_qos_object network_lat_pm_qos = { + .constraints = &network_lat_constraints, + .name = "network_latency", }; static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier); -static struct pm_qos_object network_throughput_pm_qos = { - .constraints = PLIST_HEAD_INIT(network_throughput_pm_qos.constraints), - .notifiers = &network_throughput_notifier, - .name = "network_throughput", +static struct pm_qos_constraints network_tput_constraints = { + .list = PLIST_HEAD_INIT(network_tput_constraints.list), .target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE, .default_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE, .type = PM_QOS_MAX, + .notifiers = &network_throughput_notifier, +}; +static struct pm_qos_object network_throughput_pm_qos = { + .constraints = &network_tput_constraints, + .name = "network_throughput", }; @@ -129,15 +124,15 @@ static const struct file_operations pm_qos_power_fops = { /* unlocked internal variant */ static inline int pm_qos_get_value(struct pm_qos_object *o) { - if (plist_head_empty(&o->constraints)) - return o->default_value; + if (plist_head_empty(&o->constraints->list)) + return o->constraints->default_value; - switch (o->type) { + switch (o->constraints->type) { case PM_QOS_MIN: - return plist_first(&o->constraints)->prio; + return plist_first(&o->constraints->list)->prio; case PM_QOS_MAX: - return plist_last(&o->constraints)->prio; + return plist_last(&o->constraints->list)->prio; default: /* runtime check for not using enum */ @@ -147,12 +142,12 @@ static inline int pm_qos_get_value(struct pm_qos_object *o) static inline s32 pm_qos_read_value(struct pm_qos_object *o) { - return o->target_value; + return o->constraints->target_value; } static inline void pm_qos_set_value(struct pm_qos_object *o, s32 value) { - o->target_value = value; + o->constraints->target_value = value; } static void update_target(struct pm_qos_object *o, struct plist_node *node, @@ -170,20 +165,20 @@ static void update_target(struct pm_qos_object *o, struct plist_node *node, * with new value and add, then see if the extremal * changed */ - plist_del(node, &o->constraints); + plist_del(node, &o->constraints->list); plist_node_init(node, value); - plist_add(node, &o->constraints); + plist_add(node, &o->constraints->list); } else if (del) { - plist_del(node, &o->constraints); + plist_del(node, &o->constraints->list); } else { - plist_add(node, &o->constraints); + plist_add(node, &o->constraints->list); } curr_value = pm_qos_get_value(o); pm_qos_set_value(o, curr_value); spin_unlock_irqrestore(&pm_qos_lock, flags); if (prev_value != curr_value) - blocking_notifier_call_chain(o->notifiers, + blocking_notifier_call_chain(o->constraints->notifiers, (unsigned long)curr_value, NULL); } @@ -230,7 +225,7 @@ void pm_qos_add_request(struct pm_qos_request *req, return; } if (value == PM_QOS_DEFAULT_VALUE) - new_value = o->default_value; + new_value = o->constraints->default_value; else new_value = value; plist_node_init(&req->node, new_value); @@ -266,7 +261,7 @@ void pm_qos_update_request(struct pm_qos_request *req, o = pm_qos_array[req->pm_qos_class]; if (new_value == PM_QOS_DEFAULT_VALUE) - temp = o->default_value; + temp = o->constraints->default_value; else temp = new_value; @@ -315,7 +310,8 @@ int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier) int retval; retval = blocking_notifier_chain_register( - pm_qos_array[pm_qos_class]->notifiers, notifier); + pm_qos_array[pm_qos_class]->constraints->notifiers, + notifier); return retval; } @@ -334,7 +330,8 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier) int retval; retval = blocking_notifier_chain_unregister( - pm_qos_array[pm_qos_class]->notifiers, notifier); + pm_qos_array[pm_qos_class]->constraints->notifiers, + notifier); return retval; }