Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751790Ab0AABUi (ORCPT ); Thu, 31 Dec 2009 20:20:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751443Ab0AABUh (ORCPT ); Thu, 31 Dec 2009 20:20:37 -0500 Received: from wolverine02.qualcomm.com ([199.106.114.251]:27486 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284Ab0AABUh (ORCPT ); Thu, 31 Dec 2009 20:20:37 -0500 X-IronPort-AV: E=McAfee;i="5400,1158,5848"; a="31186414" From: Daniel Walker To: linux-kernel@vger.kernel.org Cc: Mark Gross Subject: [PATCH] pm_qos: Add QoS param, minimum system bus frequency Date: Thu, 31 Dec 2009 17:20:27 -0800 Message-Id: <1262308827-24215-1-git-send-email-dwalker@codeaurora.org> X-Mailer: git-send-email 1.6.3.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3266 Lines: 98 From: Praveen Chidambaram In some systems, the system bus speed can be varied, usually based on the current CPU frequency. However, various device drivers and/or applications may need a faster system bus for I/O even though the CPU itself may be idle. Signed-off-by: Praveen Chidambaram Signed-off-by: David Brown Signed-off-by: Daniel Walker --- include/linux/pm_qos_params.h | 3 ++- kernel/pm_qos_params.c | 32 +++++++++++++++++++++++++------- 2 files changed, 27 insertions(+), 8 deletions(-) diff --git a/include/linux/pm_qos_params.h b/include/linux/pm_qos_params.h index d74f75e..091c13c 100644 --- a/include/linux/pm_qos_params.h +++ b/include/linux/pm_qos_params.h @@ -10,8 +10,9 @@ #define PM_QOS_CPU_DMA_LATENCY 1 #define PM_QOS_NETWORK_LATENCY 2 #define PM_QOS_NETWORK_THROUGHPUT 3 +#define PM_QOS_SYSTEM_BUS_FREQ 4 -#define PM_QOS_NUM_CLASSES 4 +#define PM_QOS_NUM_CLASSES 5 #define PM_QOS_DEFAULT_VALUE -1 int pm_qos_add_requirement(int qos, char *name, s32 value); diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c index 3db49b9..8576f40 100644 --- a/kernel/pm_qos_params.c +++ b/kernel/pm_qos_params.c @@ -102,12 +102,24 @@ static struct pm_qos_object network_throughput_pm_qos = { .comparitor = max_compare }; +static BLOCKING_NOTIFIER_HEAD(system_bus_freq_notifier); +static struct pm_qos_object system_bus_freq_pm_qos = { + .requirements = + {LIST_HEAD_INIT(system_bus_freq_pm_qos.requirements.list)}, + .notifiers = &system_bus_freq_notifier, + .name = "system_bus_freq", + .default_value = 0, + .target_value = ATOMIC_INIT(0), + .comparitor = max_compare +}; + -static struct pm_qos_object *pm_qos_array[] = { - &null_pm_qos, - &cpu_dma_pm_qos, - &network_lat_pm_qos, - &network_throughput_pm_qos +static struct pm_qos_object *pm_qos_array[PM_QOS_NUM_CLASSES] = { + [PM_QOS_RESERVED] = &null_pm_qos, + [PM_QOS_CPU_DMA_LATENCY] = &cpu_dma_pm_qos, + [PM_QOS_NETWORK_LATENCY] = &network_lat_pm_qos, + [PM_QOS_NETWORK_THROUGHPUT] = &network_throughput_pm_qos, + [PM_QOS_SYSTEM_BUS_FREQ] = &system_bus_freq_pm_qos, }; static DEFINE_SPINLOCK(pm_qos_lock); @@ -313,7 +325,7 @@ EXPORT_SYMBOL_GPL(pm_qos_remove_requirement); * will register the notifier into a notification chain that gets called * upon changes to the pm_qos_class target value. */ - int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier) +int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier) { int retval; @@ -409,9 +421,15 @@ static int __init pm_qos_power_init(void) return ret; } ret = register_pm_qos_misc(&network_throughput_pm_qos); - if (ret < 0) + if (ret < 0) { printk(KERN_ERR "pm_qos_param: network_throughput setup failed\n"); + return ret; + } + ret = register_pm_qos_misc(&system_bus_freq_pm_qos); + if (ret < 0) + printk(KERN_ERR + "pm_qos_param: system_bus_freq setup failed\n"); return ret; } -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/