Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / base / syscore.c

diff --git a/kernel/drivers/base/syscore.c b/kernel/drivers/base/syscore.c
new file mode 100644 (file)
index 0000000..8d98a32
--- /dev/null
+++ b/kernel/drivers/base/syscore.c
@@ -0,0 +1,131 @@
+/*
+ *  syscore.c - Execution of system core operations.
+ *
+ *  Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ *  This file is released under the GPLv2.
+ */
+
+#include <linux/syscore_ops.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <trace/events/power.h>
+
+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;
+
+       trace_suspend_resume(TPS("syscore_suspend"), 0, true);
+       pr_debug("Checking wakeup interrupts\n");
+
+       /* Return error code if there are any wakeup interrupts pending. */
+       if (pm_wakeup_pending())
+               return -EBUSY;
+
+       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);
+               }
+
+       trace_suspend_resume(TPS("syscore_suspend"), 0, false);
+       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;
+}
+EXPORT_SYMBOL_GPL(syscore_suspend);
+
+/**
+ * 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;
+
+       trace_suspend_resume(TPS("syscore_resume"), 0, true);
+       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);
+               }
+       trace_suspend_resume(TPS("syscore_resume"), 0, false);
+}
+EXPORT_SYMBOL_GPL(syscore_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);
+}