From 40dc166cb5dddbd36aa4ad11c03915ea538f5a61 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 15 Mar 2011 00:43:46 +0100 Subject: PM / Core: Introduce struct syscore_ops for core subsystems PM Some subsystems need to carry out suspend/resume and shutdown operations with one CPU on-line and interrupts disabled. The only way to register such operations is to define a sysdev class and a sysdev specifically for this purpose which is cumbersome and inefficient. Moreover, the arguments taken by sysdev suspend, resume and shutdown callbacks are practically never necessary. For this reason, introduce a simpler interface allowing subsystems to register operations to be executed very late during system suspend and shutdown and very early during resume in the form of strcut syscore_ops objects. Signed-off-by: Rafael J. Wysocki Acked-by: Greg Kroah-Hartman --- drivers/base/syscore.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 drivers/base/syscore.c (limited to 'drivers/base/syscore.c') diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c new file mode 100644 index 000000000000..90af2943f9e4 --- /dev/null +++ b/drivers/base/syscore.c @@ -0,0 +1,117 @@ +/* + * syscore.c - Execution of system core operations. + * + * Copyright (C) 2011 Rafael J. Wysocki , Novell Inc. + * + * This file is released under the GPLv2. + */ + +#include +#include +#include + +static LIST_HEAD(syscore_ops_list); +static DEFINE_MUTEX(syscore_ops_lock); + +/** + * register_syscore_ops - Register a set of system core operations. + * @ops: System core operations to register. + */ +void register_syscore_ops(struct syscore_ops *ops) +{ + mutex_lock(&syscore_ops_lock); + list_add_tail(&ops->node, &syscore_ops_list); + mutex_unlock(&syscore_ops_lock); +} +EXPORT_SYMBOL_GPL(register_syscore_ops); + +/** + * unregister_syscore_ops - Unregister a set of system core operations. + * @ops: System core operations to unregister. + */ +void unregister_syscore_ops(struct syscore_ops *ops) +{ + mutex_lock(&syscore_ops_lock); + list_del(&ops->node); + mutex_unlock(&syscore_ops_lock); +} +EXPORT_SYMBOL_GPL(unregister_syscore_ops); + +#ifdef CONFIG_PM_SLEEP +/** + * syscore_suspend - Execute all the registered system core suspend callbacks. + * + * This function is executed with one CPU on-line and disabled interrupts. + */ +int syscore_suspend(void) +{ + struct syscore_ops *ops; + int ret = 0; + + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled before system core suspend.\n"); + + list_for_each_entry_reverse(ops, &syscore_ops_list, node) + if (ops->suspend) { + if (initcall_debug) + pr_info("PM: Calling %pF\n", ops->suspend); + ret = ops->suspend(); + if (ret) + goto err_out; + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled after %pF\n", ops->suspend); + } + + return 0; + + err_out: + pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend); + + list_for_each_entry_continue(ops, &syscore_ops_list, node) + if (ops->resume) + ops->resume(); + + return ret; +} + +/** + * syscore_resume - Execute all the registered system core resume callbacks. + * + * This function is executed with one CPU on-line and disabled interrupts. + */ +void syscore_resume(void) +{ + struct syscore_ops *ops; + + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled before system core resume.\n"); + + list_for_each_entry(ops, &syscore_ops_list, node) + if (ops->resume) { + if (initcall_debug) + pr_info("PM: Calling %pF\n", ops->resume); + ops->resume(); + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled after %pF\n", ops->resume); + } +} +#endif /* CONFIG_PM_SLEEP */ + +/** + * syscore_shutdown - Execute all the registered system core shutdown callbacks. + */ +void syscore_shutdown(void) +{ + struct syscore_ops *ops; + + mutex_lock(&syscore_ops_lock); + + list_for_each_entry_reverse(ops, &syscore_ops_list, node) + if (ops->shutdown) { + if (initcall_debug) + pr_info("PM: Calling %pF\n", ops->shutdown); + ops->shutdown(); + } + + mutex_unlock(&syscore_ops_lock); +} -- cgit v1.2.3