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090e77c391
There are only a few callbacks which really care about FROZEN vs. !FROZEN. No need to have extra states for this. Publish the frozen state in an extra variable which is updated under the hotplug lock and let the users interested deal with it w/o imposing that extra state checks on everyone. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: Rik van Riel <riel@redhat.com> Cc: Rafael Wysocki <rafael.j.wysocki@intel.com> Cc: "Srivatsa S. Bhat" <srivatsa@mit.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul Turner <pjt@google.com> Link: http://lkml.kernel.org/r/20160226182340.334912357@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
295 lines
9 KiB
C
295 lines
9 KiB
C
/*
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* include/linux/cpu.h - generic cpu definition
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*
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* This is mainly for topological representation. We define the
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* basic 'struct cpu' here, which can be embedded in per-arch
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* definitions of processors.
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*
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* Basic handling of the devices is done in drivers/base/cpu.c
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*
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* CPUs are exported via sysfs in the devices/system/cpu
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* directory.
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*/
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#ifndef _LINUX_CPU_H_
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#define _LINUX_CPU_H_
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#include <linux/node.h>
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#include <linux/compiler.h>
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#include <linux/cpumask.h>
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struct device;
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struct device_node;
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struct attribute_group;
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struct cpu {
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int node_id; /* The node which contains the CPU */
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int hotpluggable; /* creates sysfs control file if hotpluggable */
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struct device dev;
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};
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extern int register_cpu(struct cpu *cpu, int num);
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extern struct device *get_cpu_device(unsigned cpu);
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extern bool cpu_is_hotpluggable(unsigned cpu);
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extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
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extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
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int cpu, unsigned int *thread);
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extern int cpu_add_dev_attr(struct device_attribute *attr);
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extern void cpu_remove_dev_attr(struct device_attribute *attr);
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extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
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extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
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extern __printf(4, 5)
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struct device *cpu_device_create(struct device *parent, void *drvdata,
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const struct attribute_group **groups,
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const char *fmt, ...);
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#ifdef CONFIG_HOTPLUG_CPU
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extern void unregister_cpu(struct cpu *cpu);
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extern ssize_t arch_cpu_probe(const char *, size_t);
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extern ssize_t arch_cpu_release(const char *, size_t);
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#endif
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struct notifier_block;
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/*
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* CPU notifier priorities.
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*/
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enum {
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/*
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* SCHED_ACTIVE marks a cpu which is coming up active during
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* CPU_ONLINE and CPU_DOWN_FAILED and must be the first
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* notifier. CPUSET_ACTIVE adjusts cpuset according to
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* cpu_active mask right after SCHED_ACTIVE. During
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* CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
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* ordered in the similar way.
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*
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* This ordering guarantees consistent cpu_active mask and
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* migration behavior to all cpu notifiers.
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*/
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CPU_PRI_SCHED_ACTIVE = INT_MAX,
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CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
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CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
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CPU_PRI_CPUSET_INACTIVE = INT_MIN,
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/* migration should happen before other stuff but after perf */
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CPU_PRI_PERF = 20,
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CPU_PRI_MIGRATION = 10,
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CPU_PRI_SMPBOOT = 9,
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/* bring up workqueues before normal notifiers and down after */
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CPU_PRI_WORKQUEUE_UP = 5,
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CPU_PRI_WORKQUEUE_DOWN = -5,
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};
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#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
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#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
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#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
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#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
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#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
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#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
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#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
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* not handling interrupts, soon dead.
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* Called on the dying cpu, interrupts
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* are already disabled. Must not
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* sleep, must not fail */
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#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
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* lock is dropped */
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#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
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* Called on the new cpu, just before
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* enabling interrupts. Must not sleep,
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* must not fail */
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#define CPU_DYING_IDLE 0x000B /* CPU (unsigned)v dying, reached
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* idle loop. */
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#define CPU_BROKEN 0x000C /* CPU (unsigned)v did not die properly,
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* perhaps due to preemption. */
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/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
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* operation in progress
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*/
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#define CPU_TASKS_FROZEN 0x0010
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#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
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#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
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#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
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#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
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#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
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#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
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#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
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#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
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#ifdef CONFIG_SMP
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extern bool cpuhp_tasks_frozen;
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/* Need to know about CPUs going up/down? */
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#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
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#define cpu_notifier(fn, pri) { \
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static struct notifier_block fn##_nb = \
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{ .notifier_call = fn, .priority = pri }; \
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register_cpu_notifier(&fn##_nb); \
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}
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#define __cpu_notifier(fn, pri) { \
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static struct notifier_block fn##_nb = \
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{ .notifier_call = fn, .priority = pri }; \
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__register_cpu_notifier(&fn##_nb); \
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}
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#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
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#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
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#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
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#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
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#ifdef CONFIG_HOTPLUG_CPU
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extern int register_cpu_notifier(struct notifier_block *nb);
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extern int __register_cpu_notifier(struct notifier_block *nb);
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extern void unregister_cpu_notifier(struct notifier_block *nb);
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extern void __unregister_cpu_notifier(struct notifier_block *nb);
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#else
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#ifndef MODULE
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extern int register_cpu_notifier(struct notifier_block *nb);
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extern int __register_cpu_notifier(struct notifier_block *nb);
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#else
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static inline int register_cpu_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int __register_cpu_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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#endif
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static inline void unregister_cpu_notifier(struct notifier_block *nb)
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{
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}
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static inline void __unregister_cpu_notifier(struct notifier_block *nb)
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{
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}
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#endif
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void smpboot_thread_init(void);
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int cpu_up(unsigned int cpu);
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void notify_cpu_starting(unsigned int cpu);
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extern void cpu_maps_update_begin(void);
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extern void cpu_maps_update_done(void);
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#define cpu_notifier_register_begin cpu_maps_update_begin
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#define cpu_notifier_register_done cpu_maps_update_done
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#else /* CONFIG_SMP */
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#define cpuhp_tasks_frozen 0
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#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
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#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
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static inline int register_cpu_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int __register_cpu_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline void unregister_cpu_notifier(struct notifier_block *nb)
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{
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}
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static inline void __unregister_cpu_notifier(struct notifier_block *nb)
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{
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}
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static inline void cpu_maps_update_begin(void)
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{
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}
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static inline void cpu_maps_update_done(void)
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{
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}
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static inline void cpu_notifier_register_begin(void)
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{
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}
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static inline void cpu_notifier_register_done(void)
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{
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}
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static inline void smpboot_thread_init(void)
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{
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}
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#endif /* CONFIG_SMP */
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extern struct bus_type cpu_subsys;
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#ifdef CONFIG_HOTPLUG_CPU
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/* Stop CPUs going up and down. */
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extern void cpu_hotplug_begin(void);
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extern void cpu_hotplug_done(void);
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extern void get_online_cpus(void);
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extern void put_online_cpus(void);
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extern void cpu_hotplug_disable(void);
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extern void cpu_hotplug_enable(void);
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#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
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#define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
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#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
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#define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
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#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
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#define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
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void clear_tasks_mm_cpumask(int cpu);
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int cpu_down(unsigned int cpu);
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#else /* CONFIG_HOTPLUG_CPU */
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static inline void cpu_hotplug_begin(void) {}
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static inline void cpu_hotplug_done(void) {}
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#define get_online_cpus() do { } while (0)
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#define put_online_cpus() do { } while (0)
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#define cpu_hotplug_disable() do { } while (0)
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#define cpu_hotplug_enable() do { } while (0)
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#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
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#define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
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/* These aren't inline functions due to a GCC bug. */
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#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
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#define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
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#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
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#define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
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#endif /* CONFIG_HOTPLUG_CPU */
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#ifdef CONFIG_PM_SLEEP_SMP
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extern int disable_nonboot_cpus(void);
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extern void enable_nonboot_cpus(void);
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#else /* !CONFIG_PM_SLEEP_SMP */
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static inline int disable_nonboot_cpus(void) { return 0; }
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static inline void enable_nonboot_cpus(void) {}
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#endif /* !CONFIG_PM_SLEEP_SMP */
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enum cpuhp_state {
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CPUHP_OFFLINE,
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CPUHP_ONLINE,
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};
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void cpu_startup_entry(enum cpuhp_state state);
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void cpu_idle_poll_ctrl(bool enable);
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void arch_cpu_idle(void);
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void arch_cpu_idle_prepare(void);
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void arch_cpu_idle_enter(void);
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void arch_cpu_idle_exit(void);
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void arch_cpu_idle_dead(void);
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DECLARE_PER_CPU(bool, cpu_dead_idle);
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int cpu_report_state(int cpu);
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int cpu_check_up_prepare(int cpu);
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void cpu_set_state_online(int cpu);
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#ifdef CONFIG_HOTPLUG_CPU
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bool cpu_wait_death(unsigned int cpu, int seconds);
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bool cpu_report_death(void);
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */
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#endif /* _LINUX_CPU_H_ */
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