diff for duplicates of <4E6D924F.9050605@ti.com> diff --git a/N1/2.hdr b/N1/2.hdr new file mode 100644 index 0000000..24d75fb --- /dev/null +++ b/N1/2.hdr @@ -0,0 +1,5 @@ +Content-Type: text/x-patch; + name="0001-cpu_pm-Add-cpu-power-management-notifiers.patch" +Content-Transfer-Encoding: 7bit +Content-Disposition: attachment; + filename*0="0001-cpu_pm-Add-cpu-power-management-notifiers.patch" diff --git a/N1/2.txt b/N1/2.txt new file mode 100644 index 0000000..c696dea --- /dev/null +++ b/N1/2.txt @@ -0,0 +1,377 @@ +>From 6a0ef5d42da459d9eba0a5f396e6d9a95d3f94ff Mon Sep 17 00:00:00 2001 +From: Colin Cross <ccross@android.com> +Date: Thu, 10 Feb 2011 02:04:45 -0800 +Subject: [PATCH 1/5] cpu_pm: Add cpu power management notifiers + +During some CPU power modes entered during idle, hotplug and +suspend, peripherals located in the CPU power domain, such as +the GIC, localtimers, and VFP, may be powered down. Add a +notifier chain that allows drivers for those peripherals to +be notified before and after they may be reset. + +Notified drivers can include VFP co-processor, interrupt controller +and it's PM extensions, local CPU timers context save/restore which +shouldn't be interrupted. Hence CPU PM event APIs must be called +with interrupts disabled. + +Signed-off-by: Colin Cross <ccross@android.com> +Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> +Reviewed-by: Kevin Hilman <khilman@ti.com> +Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org> +Tested-by: Kevin Hilman <khilman@ti.com> +--- + include/linux/cpu_pm.h | 109 ++++++++++++++++++++++++++ + kernel/Makefile | 1 + + kernel/cpu_pm.c | 200 ++++++++++++++++++++++++++++++++++++++++++++++++ + kernel/power/Kconfig | 4 + + 4 files changed, 314 insertions(+), 0 deletions(-) + create mode 100644 include/linux/cpu_pm.h + create mode 100644 kernel/cpu_pm.c + +diff --git a/include/linux/cpu_pm.h b/include/linux/cpu_pm.h +new file mode 100644 +index 0000000..455b233 +--- /dev/null ++++ b/include/linux/cpu_pm.h +@@ -0,0 +1,109 @@ ++/* ++ * Copyright (C) 2011 Google, Inc. ++ * ++ * Author: ++ * Colin Cross <ccross@android.com> ++ * ++ * This software is licensed under the terms of the GNU General Public ++ * License version 2, as published by the Free Software Foundation, and ++ * may be copied, distributed, and modified under those terms. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ */ ++ ++#ifndef _LINUX_CPU_PM_H ++#define _LINUX_CPU_PM_H ++ ++#include <linux/kernel.h> ++#include <linux/notifier.h> ++ ++/* ++ * When a CPU goes to a low power state that turns off power to the CPU's ++ * power domain, the contents of some blocks (floating point coprocessors, ++ * interrupt controllers, caches, timers) in the same power domain can ++ * be lost. The cpm_pm notifiers provide a method for platform idle, suspend, ++ * and hotplug implementations to notify the drivers for these blocks that ++ * they may be reset. ++ * ++ * All cpu_pm notifications must be called with interrupts disabled. ++ * ++ * The notifications are split into two classes: CPU notifications and CPU ++ * cluster notifications. ++ * ++ * CPU notifications apply to a single CPU and must be called on the affected ++ * CPU. They are used to save per-cpu context for affected blocks. ++ * ++ * CPU cluster notifications apply to all CPUs in a single power domain. They ++ * are used to save any global context for affected blocks, and must be called ++ * after all the CPUs in the power domain have been notified of the low power ++ * state. ++ */ ++ ++/* ++ * Event codes passed as unsigned long val to notifier calls ++ */ ++enum cpu_pm_event { ++ /* A single cpu is entering a low power state */ ++ CPU_PM_ENTER, ++ ++ /* A single cpu failed to enter a low power state */ ++ CPU_PM_ENTER_FAILED, ++ ++ /* A single cpu is exiting a low power state */ ++ CPU_PM_EXIT, ++ ++ /* A cpu power domain is entering a low power state */ ++ CPU_CLUSTER_PM_ENTER, ++ ++ /* A cpu power domain failed to enter a low power state */ ++ CPU_CLUSTER_PM_ENTER_FAILED, ++ ++ /* A cpu power domain is exiting a low power state */ ++ CPU_CLUSTER_PM_EXIT, ++}; ++ ++#ifdef CONFIG_CPU_PM ++int cpu_pm_register_notifier(struct notifier_block *nb); ++int cpu_pm_unregister_notifier(struct notifier_block *nb); ++int cpu_pm_enter(void); ++int cpu_pm_exit(void); ++int cpu_cluster_pm_enter(void); ++int cpu_cluster_pm_exit(void); ++ ++#else ++ ++static inline int cpu_pm_register_notifier(struct notifier_block *nb) ++{ ++ return 0; ++} ++ ++static inline int cpu_pm_unregister_notifier(struct notifier_block *nb) ++{ ++ return 0; ++} ++ ++static inline int cpu_pm_enter(void) ++{ ++ return 0; ++} ++ ++static inline int cpu_pm_exit(void) ++{ ++ return 0; ++} ++ ++static inline int cpu_cluster_pm_enter(void) ++{ ++ return 0; ++} ++ ++static inline int cpu_cluster_pm_exit(void) ++{ ++ return 0; ++} ++#endif ++#endif +diff --git a/kernel/Makefile b/kernel/Makefile +index eca595e..988cb3d 100644 +--- a/kernel/Makefile ++++ b/kernel/Makefile +@@ -101,6 +101,7 @@ obj-$(CONFIG_RING_BUFFER) += trace/ + obj-$(CONFIG_TRACEPOINTS) += trace/ + obj-$(CONFIG_SMP) += sched_cpupri.o + obj-$(CONFIG_IRQ_WORK) += irq_work.o ++obj-$(CONFIG_CPU_PM) += cpu_pm.o + + obj-$(CONFIG_PERF_EVENTS) += events/ + +diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c +new file mode 100644 +index 0000000..4d1ff4a +--- /dev/null ++++ b/kernel/cpu_pm.c +@@ -0,0 +1,200 @@ ++/* ++ * Copyright (C) 2011 Google, Inc. ++ * ++ * Author: ++ * Colin Cross <ccross@android.com> ++ * ++ * This software is licensed under the terms of the GNU General Public ++ * License version 2, as published by the Free Software Foundation, and ++ * may be copied, distributed, and modified under those terms. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ */ ++ ++#include <linux/kernel.h> ++#include <linux/cpu_pm.h> ++#include <linux/module.h> ++#include <linux/notifier.h> ++#include <linux/spinlock.h> ++ ++static DEFINE_RWLOCK(cpu_pm_notifier_lock); ++static RAW_NOTIFIER_HEAD(cpu_pm_notifier_chain); ++ ++static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls) ++{ ++ int ret; ++ ++ ret = __raw_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL, ++ nr_to_call, nr_calls); ++ ++ return notifier_to_errno(ret); ++} ++ ++/** ++ * cpu_pm_register_notifier - register a driver with cpu_pm ++ * @nb: notifier block to register ++ * ++ * Add a driver to a list of drivers that are notified about ++ * CPU and CPU cluster low power entry and exit. ++ * ++ * This function may sleep, and has the same return conditions as ++ * raw_notifier_chain_register. ++ */ ++int cpu_pm_register_notifier(struct notifier_block *nb) ++{ ++ unsigned long flags; ++ int ret; ++ ++ write_lock_irqsave(&cpu_pm_notifier_lock, flags); ++ ret = raw_notifier_chain_register(&cpu_pm_notifier_chain, nb); ++ write_unlock_irqrestore(&cpu_pm_notifier_lock, flags); ++ ++ return ret; ++} ++EXPORT_SYMBOL_GPL(cpu_pm_register_notifier); ++ ++/** ++ * cpu_pm_unregister_notifier - unregister a driver with cpu_pm ++ * @nb: notifier block to be unregistered ++ * ++ * Remove a driver from the CPU PM notifier list. ++ * ++ * This function may sleep, and has the same return conditions as ++ * raw_notifier_chain_unregister. ++ */ ++int cpu_pm_unregister_notifier(struct notifier_block *nb) ++{ ++ unsigned long flags; ++ int ret; ++ ++ write_lock_irqsave(&cpu_pm_notifier_lock, flags); ++ ret = raw_notifier_chain_unregister(&cpu_pm_notifier_chain, nb); ++ write_unlock_irqrestore(&cpu_pm_notifier_lock, flags); ++ ++ return ret; ++} ++EXPORT_SYMBOL_GPL(cpu_pm_unregister_notifier); ++ ++/** ++ * cpm_pm_enter - CPU low power entry notifier ++ * ++ * Notifies listeners that a single CPU is entering a low power state that may ++ * cause some blocks in the same power domain as the cpu to reset. ++ * ++ * Must be called on the affected CPU with interrupts disabled. Platform is ++ * responsible for ensuring that cpu_pm_enter is not called twice on the same ++ * CPU before cpu_pm_exit is called. Notified drivers can include VFP ++ * co-processor, interrupt controller and it's PM extensions, local CPU ++ * timers context save/restore which shouldn't be interrupted. Hence it ++ * must be called with interrupts disabled. ++ * ++ * Return conditions are same as __raw_notifier_call_chain. ++ */ ++int cpu_pm_enter(void) ++{ ++ int nr_calls; ++ int ret = 0; ++ ++ read_lock(&cpu_pm_notifier_lock); ++ ret = cpu_pm_notify(CPU_PM_ENTER, -1, &nr_calls); ++ if (ret) ++ /* ++ * Inform listeners (nr_calls - 1) about failure of CPU PM ++ * PM entry who are notified earlier to prepare for it. ++ */ ++ cpu_pm_notify(CPU_PM_ENTER_FAILED, nr_calls - 1, NULL); ++ read_unlock(&cpu_pm_notifier_lock); ++ ++ return ret; ++} ++EXPORT_SYMBOL_GPL(cpu_pm_enter); ++ ++/** ++ * cpm_pm_exit - CPU low power exit notifier ++ * ++ * Notifies listeners that a single CPU is exiting a low power state that may ++ * have caused some blocks in the same power domain as the cpu to reset. ++ * ++ * Notified drivers can include VFP co-processor, interrupt controller ++ * and it's PM extensions, local CPU timers context save/restore which ++ * shouldn't be interrupted. Hence it must be called with interrupts disabled. ++ * ++ * Return conditions are same as __raw_notifier_call_chain. ++ */ ++int cpu_pm_exit(void) ++{ ++ int ret; ++ ++ read_lock(&cpu_pm_notifier_lock); ++ ret = cpu_pm_notify(CPU_PM_EXIT, -1, NULL); ++ read_unlock(&cpu_pm_notifier_lock); ++ ++ return ret; ++} ++EXPORT_SYMBOL_GPL(cpu_pm_exit); ++ ++/** ++ * cpm_cluster_pm_enter - CPU cluster low power entry notifier ++ * ++ * Notifies listeners that all cpus in a power domain are entering a low power ++ * state that may cause some blocks in the same power domain to reset. ++ * ++ * Must be called after cpu_pm_enter has been called on all cpus in the power ++ * domain, and before cpu_pm_exit has been called on any cpu in the power ++ * domain. Notified drivers can include VFP co-processor, interrupt controller ++ * and it's PM extensions, local CPU timers context save/restore which ++ * shouldn't be interrupted. Hence it must be called with interrupts disabled. ++ * ++ * Must be called with interrupts disabled. ++ * ++ * Return conditions are same as __raw_notifier_call_chain. ++ */ ++int cpu_cluster_pm_enter(void) ++{ ++ int nr_calls; ++ int ret = 0; ++ ++ read_lock(&cpu_pm_notifier_lock); ++ ret = cpu_pm_notify(CPU_CLUSTER_PM_ENTER, -1, &nr_calls); ++ if (ret) ++ /* ++ * Inform listeners (nr_calls - 1) about failure of CPU cluster ++ * PM entry who are notified earlier to prepare for it. ++ */ ++ cpu_pm_notify(CPU_CLUSTER_PM_ENTER_FAILED, nr_calls - 1, NULL); ++ read_unlock(&cpu_pm_notifier_lock); ++ ++ return ret; ++} ++EXPORT_SYMBOL_GPL(cpu_cluster_pm_enter); ++ ++/** ++ * cpm_cluster_pm_exit - CPU cluster low power exit notifier ++ * ++ * Notifies listeners that all cpus in a power domain are exiting form a ++ * low power state that may have caused some blocks in the same power domain ++ * to reset. ++ * ++ * Must be called after cpu_pm_exit has been called on all cpus in the power ++ * domain, and before cpu_pm_exit has been called on any cpu in the power ++ * domain. Notified drivers can include VFP co-processor, interrupt controller ++ * and it's PM extensions, local CPU timers context save/restore which ++ * shouldn't be interrupted. Hence it must be called with interrupts disabled. ++ * ++ * Return conditions are same as __raw_notifier_call_chain. ++ */ ++int cpu_cluster_pm_exit(void) ++{ ++ int ret; ++ ++ read_lock(&cpu_pm_notifier_lock); ++ ret = cpu_pm_notify(CPU_CLUSTER_PM_EXIT, -1, NULL); ++ read_unlock(&cpu_pm_notifier_lock); ++ ++ return ret; ++} ++EXPORT_SYMBOL_GPL(cpu_cluster_pm_exit); +diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig +index 3744c59..80a8597 100644 +--- a/kernel/power/Kconfig ++++ b/kernel/power/Kconfig +@@ -235,3 +235,7 @@ config PM_GENERIC_DOMAINS + config PM_GENERIC_DOMAINS_RUNTIME + def_bool y + depends on PM_RUNTIME && PM_GENERIC_DOMAINS ++ ++config CPU_PM ++ bool ++ depends on SUSPEND || CPU_IDLE +-- +1.7.4.1 diff --git a/a/content_digest b/N1/content_digest index 02dece5..76367b5 100644 --- a/a/content_digest +++ b/N1/content_digest @@ -2,11 +2,17 @@ "ref\01315060755-4613-2-git-send-email-santosh.shilimkar@ti.com\0" "ref\020110909155632.661f5696.akpm@linux-foundation.org\0" "ref\04E6B2E6E.7010807@ti.com\0" - "From\0santosh.shilimkar@ti.com (Santosh)\0" - "Subject\0[PATCH v2 1/5] cpu_pm: Add cpu power management notifiers\0" + "From\0Santosh <santosh.shilimkar@ti.com>\0" + "Subject\0Re: [PATCH v2 1/5] cpu_pm: Add cpu power management notifiers\0" "Date\0Mon, 12 Sep 2011 10:32:07 +0530\0" - "To\0linux-arm-kernel@lists.infradead.org\0" - "\00:1\0" + "To\0Andrew Morton <akpm@linux-foundation.org>\0" + "Cc\0linux-arm-kernel@lists.infradead.org" + linux-kernel@vger.kernel.org + linux@arm.linux.org.uk + ccross@android.com + rjw@sisk.pl + " khilman@ti.com\0" + "\01:1\0" "b\0" "On Saturday 10 September 2011 03:01 PM, Santosh wrote:\n" "> Andrew,\n" @@ -438,5 +444,385 @@ "\n" "Regards\n" Santosh + "\01:2\0" + "fn\00001-cpu_pm-Add-cpu-power-management-notifiers.patch\0" + "b\0" + ">From 6a0ef5d42da459d9eba0a5f396e6d9a95d3f94ff Mon Sep 17 00:00:00 2001\n" + "From: Colin Cross <ccross@android.com>\n" + "Date: Thu, 10 Feb 2011 02:04:45 -0800\n" + "Subject: [PATCH 1/5] cpu_pm: Add cpu power management notifiers\n" + "\n" + "During some CPU power modes entered during idle, hotplug and\n" + "suspend, peripherals located in the CPU power domain, such as\n" + "the GIC, localtimers, and VFP, may be powered down. Add a\n" + "notifier chain that allows drivers for those peripherals to\n" + "be notified before and after they may be reset.\n" + "\n" + "Notified drivers can include VFP co-processor, interrupt controller\n" + "and it's PM extensions, local CPU timers context save/restore which\n" + "shouldn't be interrupted. Hence CPU PM event APIs must be called\n" + "with interrupts disabled.\n" + "\n" + "Signed-off-by: Colin Cross <ccross@android.com>\n" + "Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>\n" + "Reviewed-by: Kevin Hilman <khilman@ti.com>\n" + "Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>\n" + "Tested-by: Kevin Hilman <khilman@ti.com>\n" + "---\n" + " include/linux/cpu_pm.h | 109 ++++++++++++++++++++++++++\n" + " kernel/Makefile | 1 +\n" + " kernel/cpu_pm.c | 200 ++++++++++++++++++++++++++++++++++++++++++++++++\n" + " kernel/power/Kconfig | 4 +\n" + " 4 files changed, 314 insertions(+), 0 deletions(-)\n" + " create mode 100644 include/linux/cpu_pm.h\n" + " create mode 100644 kernel/cpu_pm.c\n" + "\n" + "diff --git a/include/linux/cpu_pm.h b/include/linux/cpu_pm.h\n" + "new file mode 100644\n" + "index 0000000..455b233\n" + "--- /dev/null\n" + "+++ b/include/linux/cpu_pm.h\n" + "@@ -0,0 +1,109 @@\n" + "+/*\n" + "+ * Copyright (C) 2011 Google, Inc.\n" + "+ *\n" + "+ * Author:\n" + "+ *\tColin Cross <ccross@android.com>\n" + "+ *\n" + "+ * This software is licensed under the terms of the GNU General Public\n" + "+ * License version 2, as published by the Free Software Foundation, and\n" + "+ * may be copied, distributed, and modified under those terms.\n" + "+ *\n" + "+ * This program is distributed in the hope that it will be useful,\n" + "+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\n" + "+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n" + "+ * GNU General Public License for more details.\n" + "+ *\n" + "+ */\n" + "+\n" + "+#ifndef _LINUX_CPU_PM_H\n" + "+#define _LINUX_CPU_PM_H\n" + "+\n" + "+#include <linux/kernel.h>\n" + "+#include <linux/notifier.h>\n" + "+\n" + "+/*\n" + "+ * When a CPU goes to a low power state that turns off power to the CPU's\n" + "+ * power domain, the contents of some blocks (floating point coprocessors,\n" + "+ * interrupt controllers, caches, timers) in the same power domain can\n" + "+ * be lost. The cpm_pm notifiers provide a method for platform idle, suspend,\n" + "+ * and hotplug implementations to notify the drivers for these blocks that\n" + "+ * they may be reset.\n" + "+ *\n" + "+ * All cpu_pm notifications must be called with interrupts disabled.\n" + "+ *\n" + "+ * The notifications are split into two classes: CPU notifications and CPU\n" + "+ * cluster notifications.\n" + "+ *\n" + "+ * CPU notifications apply to a single CPU and must be called on the affected\n" + "+ * CPU. They are used to save per-cpu context for affected blocks.\n" + "+ *\n" + "+ * CPU cluster notifications apply to all CPUs in a single power domain. They\n" + "+ * are used to save any global context for affected blocks, and must be called\n" + "+ * after all the CPUs in the power domain have been notified of the low power\n" + "+ * state.\n" + "+ */\n" + "+\n" + "+/*\n" + "+ * Event codes passed as unsigned long val to notifier calls\n" + "+ */\n" + "+enum cpu_pm_event {\n" + "+\t/* A single cpu is entering a low power state */\n" + "+\tCPU_PM_ENTER,\n" + "+\n" + "+\t/* A single cpu failed to enter a low power state */\n" + "+\tCPU_PM_ENTER_FAILED,\n" + "+\n" + "+\t/* A single cpu is exiting a low power state */\n" + "+\tCPU_PM_EXIT,\n" + "+\n" + "+\t/* A cpu power domain is entering a low power state */\n" + "+\tCPU_CLUSTER_PM_ENTER,\n" + "+\n" + "+\t/* A cpu power domain failed to enter a low power state */\n" + "+\tCPU_CLUSTER_PM_ENTER_FAILED,\n" + "+\n" + "+\t/* A cpu power domain is exiting a low power state */\n" + "+\tCPU_CLUSTER_PM_EXIT,\n" + "+};\n" + "+\n" + "+#ifdef CONFIG_CPU_PM\n" + "+int cpu_pm_register_notifier(struct notifier_block *nb);\n" + "+int cpu_pm_unregister_notifier(struct notifier_block *nb);\n" + "+int cpu_pm_enter(void);\n" + "+int cpu_pm_exit(void);\n" + "+int cpu_cluster_pm_enter(void);\n" + "+int cpu_cluster_pm_exit(void);\n" + "+\n" + "+#else\n" + "+\n" + "+static inline int cpu_pm_register_notifier(struct notifier_block *nb)\n" + "+{\n" + "+\treturn 0;\n" + "+}\n" + "+\n" + "+static inline int cpu_pm_unregister_notifier(struct notifier_block *nb)\n" + "+{\n" + "+\treturn 0;\n" + "+}\n" + "+\n" + "+static inline int cpu_pm_enter(void)\n" + "+{\n" + "+\treturn 0;\n" + "+}\n" + "+\n" + "+static inline int cpu_pm_exit(void)\n" + "+{\n" + "+\treturn 0;\n" + "+}\n" + "+\n" + "+static inline int cpu_cluster_pm_enter(void)\n" + "+{\n" + "+\treturn 0;\n" + "+}\n" + "+\n" + "+static inline int cpu_cluster_pm_exit(void)\n" + "+{\n" + "+\treturn 0;\n" + "+}\n" + "+#endif\n" + "+#endif\n" + "diff --git a/kernel/Makefile b/kernel/Makefile\n" + "index eca595e..988cb3d 100644\n" + "--- a/kernel/Makefile\n" + "+++ b/kernel/Makefile\n" + "@@ -101,6 +101,7 @@ obj-$(CONFIG_RING_BUFFER) += trace/\n" + " obj-$(CONFIG_TRACEPOINTS) += trace/\n" + " obj-$(CONFIG_SMP) += sched_cpupri.o\n" + " obj-$(CONFIG_IRQ_WORK) += irq_work.o\n" + "+obj-$(CONFIG_CPU_PM) += cpu_pm.o\n" + " \n" + " obj-$(CONFIG_PERF_EVENTS) += events/\n" + " \n" + "diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c\n" + "new file mode 100644\n" + "index 0000000..4d1ff4a\n" + "--- /dev/null\n" + "+++ b/kernel/cpu_pm.c\n" + "@@ -0,0 +1,200 @@\n" + "+/*\n" + "+ * Copyright (C) 2011 Google, Inc.\n" + "+ *\n" + "+ * Author:\n" + "+ *\tColin Cross <ccross@android.com>\n" + "+ *\n" + "+ * This software is licensed under the terms of the GNU General Public\n" + "+ * License version 2, as published by the Free Software Foundation, and\n" + "+ * may be copied, distributed, and modified under those terms.\n" + "+ *\n" + "+ * This program is distributed in the hope that it will be useful,\n" + "+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\n" + "+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n" + "+ * GNU General Public License for more details.\n" + "+ *\n" + "+ */\n" + "+\n" + "+#include <linux/kernel.h>\n" + "+#include <linux/cpu_pm.h>\n" + "+#include <linux/module.h>\n" + "+#include <linux/notifier.h>\n" + "+#include <linux/spinlock.h>\n" + "+\n" + "+static DEFINE_RWLOCK(cpu_pm_notifier_lock);\n" + "+static RAW_NOTIFIER_HEAD(cpu_pm_notifier_chain);\n" + "+\n" + "+static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)\n" + "+{\n" + "+\tint ret;\n" + "+\n" + "+\tret = __raw_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,\n" + "+\t\tnr_to_call, nr_calls);\n" + "+\n" + "+\treturn notifier_to_errno(ret);\n" + "+}\n" + "+\n" + "+/**\n" + "+ * cpu_pm_register_notifier - register a driver with cpu_pm\n" + "+ * @nb: notifier block to register\n" + "+ *\n" + "+ * Add a driver to a list of drivers that are notified about\n" + "+ * CPU and CPU cluster low power entry and exit.\n" + "+ *\n" + "+ * This function may sleep, and has the same return conditions as\n" + "+ * raw_notifier_chain_register.\n" + "+ */\n" + "+int cpu_pm_register_notifier(struct notifier_block *nb)\n" + "+{\n" + "+\tunsigned long flags;\n" + "+\tint ret;\n" + "+\n" + "+\twrite_lock_irqsave(&cpu_pm_notifier_lock, flags);\n" + "+\tret = raw_notifier_chain_register(&cpu_pm_notifier_chain, nb);\n" + "+\twrite_unlock_irqrestore(&cpu_pm_notifier_lock, flags);\n" + "+\n" + "+\treturn ret;\n" + "+}\n" + "+EXPORT_SYMBOL_GPL(cpu_pm_register_notifier);\n" + "+\n" + "+/**\n" + "+ * cpu_pm_unregister_notifier - unregister a driver with cpu_pm\n" + "+ * @nb: notifier block to be unregistered\n" + "+ *\n" + "+ * Remove a driver from the CPU PM notifier list.\n" + "+ *\n" + "+ * This function may sleep, and has the same return conditions as\n" + "+ * raw_notifier_chain_unregister.\n" + "+ */\n" + "+int cpu_pm_unregister_notifier(struct notifier_block *nb)\n" + "+{\n" + "+\tunsigned long flags;\n" + "+\tint ret;\n" + "+\n" + "+\twrite_lock_irqsave(&cpu_pm_notifier_lock, flags);\n" + "+\tret = raw_notifier_chain_unregister(&cpu_pm_notifier_chain, nb);\n" + "+\twrite_unlock_irqrestore(&cpu_pm_notifier_lock, flags);\n" + "+\n" + "+\treturn ret;\n" + "+}\n" + "+EXPORT_SYMBOL_GPL(cpu_pm_unregister_notifier);\n" + "+\n" + "+/**\n" + "+ * cpm_pm_enter - CPU low power entry notifier\n" + "+ *\n" + "+ * Notifies listeners that a single CPU is entering a low power state that may\n" + "+ * cause some blocks in the same power domain as the cpu to reset.\n" + "+ *\n" + "+ * Must be called on the affected CPU with interrupts disabled. Platform is\n" + "+ * responsible for ensuring that cpu_pm_enter is not called twice on the same\n" + "+ * CPU before cpu_pm_exit is called. Notified drivers can include VFP\n" + "+ * co-processor, interrupt controller and it's PM extensions, local CPU\n" + "+ * timers context save/restore which shouldn't be interrupted. Hence it\n" + "+ * must be called with interrupts disabled.\n" + "+ *\n" + "+ * Return conditions are same as __raw_notifier_call_chain.\n" + "+ */\n" + "+int cpu_pm_enter(void)\n" + "+{\n" + "+\tint nr_calls;\n" + "+\tint ret = 0;\n" + "+\n" + "+\tread_lock(&cpu_pm_notifier_lock);\n" + "+\tret = cpu_pm_notify(CPU_PM_ENTER, -1, &nr_calls);\n" + "+\tif (ret)\n" + "+\t\t/*\n" + "+\t\t * Inform listeners (nr_calls - 1) about failure of CPU PM\n" + "+\t\t * PM entry who are notified earlier to prepare for it.\n" + "+\t\t */\n" + "+\t\tcpu_pm_notify(CPU_PM_ENTER_FAILED, nr_calls - 1, NULL);\n" + "+\tread_unlock(&cpu_pm_notifier_lock);\n" + "+\n" + "+\treturn ret;\n" + "+}\n" + "+EXPORT_SYMBOL_GPL(cpu_pm_enter);\n" + "+\n" + "+/**\n" + "+ * cpm_pm_exit - CPU low power exit notifier\n" + "+ *\n" + "+ * Notifies listeners that a single CPU is exiting a low power state that may\n" + "+ * have caused some blocks in the same power domain as the cpu to reset.\n" + "+ *\n" + "+ * Notified drivers can include VFP co-processor, interrupt controller\n" + "+ * and it's PM extensions, local CPU timers context save/restore which\n" + "+ * shouldn't be interrupted. Hence it must be called with interrupts disabled.\n" + "+ *\n" + "+ * Return conditions are same as __raw_notifier_call_chain.\n" + "+ */\n" + "+int cpu_pm_exit(void)\n" + "+{\n" + "+\tint ret;\n" + "+\n" + "+\tread_lock(&cpu_pm_notifier_lock);\n" + "+\tret = cpu_pm_notify(CPU_PM_EXIT, -1, NULL);\n" + "+\tread_unlock(&cpu_pm_notifier_lock);\n" + "+\n" + "+\treturn ret;\n" + "+}\n" + "+EXPORT_SYMBOL_GPL(cpu_pm_exit);\n" + "+\n" + "+/**\n" + "+ * cpm_cluster_pm_enter - CPU cluster low power entry notifier\n" + "+ *\n" + "+ * Notifies listeners that all cpus in a power domain are entering a low power\n" + "+ * state that may cause some blocks in the same power domain to reset.\n" + "+ *\n" + "+ * Must be called after cpu_pm_enter has been called on all cpus in the power\n" + "+ * domain, and before cpu_pm_exit has been called on any cpu in the power\n" + "+ * domain. Notified drivers can include VFP co-processor, interrupt controller\n" + "+ * and it's PM extensions, local CPU timers context save/restore which\n" + "+ * shouldn't be interrupted. Hence it must be called with interrupts disabled.\n" + "+ *\n" + "+ * Must be called with interrupts disabled.\n" + "+ *\n" + "+ * Return conditions are same as __raw_notifier_call_chain.\n" + "+ */\n" + "+int cpu_cluster_pm_enter(void)\n" + "+{\n" + "+\tint nr_calls;\n" + "+\tint ret = 0;\n" + "+\n" + "+\tread_lock(&cpu_pm_notifier_lock);\n" + "+\tret = cpu_pm_notify(CPU_CLUSTER_PM_ENTER, -1, &nr_calls);\n" + "+\tif (ret)\n" + "+\t\t/*\n" + "+\t\t * Inform listeners (nr_calls - 1) about failure of CPU cluster\n" + "+\t\t * PM entry who are notified earlier to prepare for it.\n" + "+\t\t */\n" + "+\t\tcpu_pm_notify(CPU_CLUSTER_PM_ENTER_FAILED, nr_calls - 1, NULL);\n" + "+\tread_unlock(&cpu_pm_notifier_lock);\n" + "+\n" + "+\treturn ret;\n" + "+}\n" + "+EXPORT_SYMBOL_GPL(cpu_cluster_pm_enter);\n" + "+\n" + "+/**\n" + "+ * cpm_cluster_pm_exit - CPU cluster low power exit notifier\n" + "+ *\n" + "+ * Notifies listeners that all cpus in a power domain are exiting form a\n" + "+ * low power state that may have caused some blocks in the same power domain\n" + "+ * to reset.\n" + "+ *\n" + "+ * Must be called after cpu_pm_exit has been called on all cpus in the power\n" + "+ * domain, and before cpu_pm_exit has been called on any cpu in the power\n" + "+ * domain. Notified drivers can include VFP co-processor, interrupt controller\n" + "+ * and it's PM extensions, local CPU timers context save/restore which\n" + "+ * shouldn't be interrupted. Hence it must be called with interrupts disabled.\n" + "+ *\n" + "+ * Return conditions are same as __raw_notifier_call_chain.\n" + "+ */\n" + "+int cpu_cluster_pm_exit(void)\n" + "+{\n" + "+\tint ret;\n" + "+\n" + "+\tread_lock(&cpu_pm_notifier_lock);\n" + "+\tret = cpu_pm_notify(CPU_CLUSTER_PM_EXIT, -1, NULL);\n" + "+\tread_unlock(&cpu_pm_notifier_lock);\n" + "+\n" + "+\treturn ret;\n" + "+}\n" + "+EXPORT_SYMBOL_GPL(cpu_cluster_pm_exit);\n" + "diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig\n" + "index 3744c59..80a8597 100644\n" + "--- a/kernel/power/Kconfig\n" + "+++ b/kernel/power/Kconfig\n" + "@@ -235,3 +235,7 @@ config PM_GENERIC_DOMAINS\n" + " config PM_GENERIC_DOMAINS_RUNTIME\n" + " \tdef_bool y\n" + " \tdepends on PM_RUNTIME && PM_GENERIC_DOMAINS\n" + "+\n" + "+config CPU_PM\n" + "+\tbool\n" + "+\tdepends on SUSPEND || CPU_IDLE\n" + "-- \n" + 1.7.4.1 -881c533d3a73fdbb6ddff9309750d07d48ddafcb1f85173a74d6636668b81ecb +2e28032cb766da5f522141e00d19e128323f4250f1533a1647b62b7d01fcbd8b
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