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-rw-r--r--include/linux/stop_machine.h148
1 files changed, 148 insertions, 0 deletions
diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
new file mode 100644
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--- /dev/null
+++ b/include/linux/stop_machine.h
@@ -0,0 +1,148 @@
+#ifndef _LINUX_STOP_MACHINE
+#define _LINUX_STOP_MACHINE
+
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/list.h>
+#include <asm/system.h>
+
+/*
+ * stop_cpu[s]() is simplistic per-cpu maximum priority cpu
+ * monopolization mechanism. The caller can specify a non-sleeping
+ * function to be executed on a single or multiple cpus preempting all
+ * other processes and monopolizing those cpus until it finishes.
+ *
+ * Resources for this mechanism are preallocated when a cpu is brought
+ * up and requests are guaranteed to be served as long as the target
+ * cpus are online.
+ */
+typedef int (*cpu_stop_fn_t)(void *arg);
+
+#ifdef CONFIG_SMP
+
+struct cpu_stop_work {
+ struct list_head list; /* cpu_stopper->works */
+ cpu_stop_fn_t fn;
+ void *arg;
+ struct cpu_stop_done *done;
+};
+
+extern struct mutex stop_cpus_mutex;
+
+int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg);
+void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
+ struct cpu_stop_work *work_buf);
+int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
+int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
+
+#else /* CONFIG_SMP */
+
+#include <linux/workqueue.h>
+
+struct cpu_stop_work {
+ struct work_struct work;
+ cpu_stop_fn_t fn;
+ void *arg;
+};
+
+static inline int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg)
+{
+ int ret = -ENOENT;
+ preempt_disable();
+ if (cpu == smp_processor_id())
+ ret = fn(arg);
+ preempt_enable();
+ return ret;
+}
+
+static void stop_one_cpu_nowait_workfn(struct work_struct *work)
+{
+ struct cpu_stop_work *stwork =
+ container_of(work, struct cpu_stop_work, work);
+ preempt_disable();
+ stwork->fn(stwork->arg);
+ preempt_enable();
+}
+
+static inline void stop_one_cpu_nowait(unsigned int cpu,
+ cpu_stop_fn_t fn, void *arg,
+ struct cpu_stop_work *work_buf)
+{
+ if (cpu == smp_processor_id()) {
+ INIT_WORK(&work_buf->work, stop_one_cpu_nowait_workfn);
+ work_buf->fn = fn;
+ work_buf->arg = arg;
+ schedule_work(&work_buf->work);
+ }
+}
+
+static inline int stop_cpus(const struct cpumask *cpumask,
+ cpu_stop_fn_t fn, void *arg)
+{
+ if (cpumask_test_cpu(raw_smp_processor_id(), cpumask))
+ return stop_one_cpu(raw_smp_processor_id(), fn, arg);
+ return -ENOENT;
+}
+
+static inline int try_stop_cpus(const struct cpumask *cpumask,
+ cpu_stop_fn_t fn, void *arg)
+{
+ return stop_cpus(cpumask, fn, arg);
+}
+
+#endif /* CONFIG_SMP */
+
+/*
+ * stop_machine "Bogolock": stop the entire machine, disable
+ * interrupts. This is a very heavy lock, which is equivalent to
+ * grabbing every spinlock (and more). So the "read" side to such a
+ * lock is anything which disables preeempt.
+ */
+#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
+
+/**
+ * stop_machine: freeze the machine on all CPUs and run this function
+ * @fn: the function to run
+ * @data: the data ptr for the @fn()
+ * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
+ *
+ * Description: This causes a thread to be scheduled on every cpu,
+ * each of which disables interrupts. The result is that no one is
+ * holding a spinlock or inside any other preempt-disabled region when
+ * @fn() runs.
+ *
+ * This can be thought of as a very heavy write lock, equivalent to
+ * grabbing every spinlock in the kernel. */
+int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
+
+/**
+ * __stop_machine: freeze the machine on all CPUs and run this function
+ * @fn: the function to run
+ * @data: the data ptr for the @fn
+ * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
+ *
+ * Description: This is a special version of the above, which assumes cpus
+ * won't come or go while it's being called. Used by hotplug cpu.
+ */
+int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
+
+#else /* CONFIG_STOP_MACHINE && CONFIG_SMP */
+
+static inline int __stop_machine(int (*fn)(void *), void *data,
+ const struct cpumask *cpus)
+{
+ int ret;
+ local_irq_disable();
+ ret = fn(data);
+ local_irq_enable();
+ return ret;
+}
+
+static inline int stop_machine(int (*fn)(void *), void *data,
+ const struct cpumask *cpus)
+{
+ return __stop_machine(fn, data, cpus);
+}
+
+#endif /* CONFIG_STOP_MACHINE && CONFIG_SMP */
+#endif /* _LINUX_STOP_MACHINE */