2005-04-17 06:20:36 +08:00
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/*
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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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* and system devices are handled in drivers/base/sys.c.
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*
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2005-09-02 14:59:25 +08:00
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* CPUs are exported via sysfs in the class/cpu/devices/
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2005-04-17 06:20:36 +08:00
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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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2012-01-31 00:46:54 +08:00
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struct device;
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2005-04-17 06:20:36 +08:00
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struct cpu {
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int node_id; /* The node which contains the CPU */
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2006-12-07 09:14:10 +08:00
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int hotpluggable; /* creates sysfs control file if hotpluggable */
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2011-12-22 06:29:42 +08:00
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struct device dev;
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2005-04-17 06:20:36 +08:00
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};
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[PATCH] node hotplug: register cpu: remove node struct
With Goto-san's patch, we can add new pgdat/node at runtime. I'm now
considering node-hot-add with cpu + memory on ACPI.
I found acpi container, which describes node, could evaluate cpu before
memory. This means cpu-hot-add occurs before memory hot add.
In most part, cpu-hot-add doesn't depend on node hot add. But register_cpu(),
which creates symbolic link from node to cpu, requires that node should be
onlined before register_cpu(). When a node is onlined, its pgdat should be
there.
This patch-set holds off creating symbolic link from node to cpu
until node is onlined.
This removes node arguments from register_cpu().
Now, register_cpu() requires 'struct node' as its argument. But the array of
struct node is now unified in driver/base/node.c now (By Goto's node hotplug
patch). We can get struct node in generic way. So, this argument is not
necessary now.
This patch also guarantees add cpu under node only when node is onlined. It
is necessary for node-hot-add vs. cpu-hot-add patch following this.
Moreover, register_cpu calculates cpu->node_id by cpu_to_node() without regard
to its 'struct node *root' argument. This patch removes it.
Also modify callers of register_cpu()/unregister_cpu, whose args are changed
by register-cpu-remove-node-struct patch.
[Brice.Goglin@ens-lyon.org: fix it]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-27 17:53:41 +08:00
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extern int register_cpu(struct cpu *cpu, int num);
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2011-12-22 06:29:42 +08:00
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extern struct device *get_cpu_device(unsigned cpu);
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2011-12-04 05:06:50 +08:00
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extern bool cpu_is_hotpluggable(unsigned cpu);
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2006-10-25 00:31:24 +08:00
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2011-12-22 06:29:42 +08:00
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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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2006-10-25 00:31:24 +08:00
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2011-12-22 06:29:42 +08:00
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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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2006-10-25 00:31:24 +08:00
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2011-12-22 06:29:42 +08:00
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extern int sched_create_sysfs_power_savings_entries(struct device *dev);
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2006-10-25 00:31:24 +08:00
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2005-04-17 06:20:36 +08:00
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#ifdef CONFIG_HOTPLUG_CPU
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[PATCH] node hotplug: register cpu: remove node struct
With Goto-san's patch, we can add new pgdat/node at runtime. I'm now
considering node-hot-add with cpu + memory on ACPI.
I found acpi container, which describes node, could evaluate cpu before
memory. This means cpu-hot-add occurs before memory hot add.
In most part, cpu-hot-add doesn't depend on node hot add. But register_cpu(),
which creates symbolic link from node to cpu, requires that node should be
onlined before register_cpu(). When a node is onlined, its pgdat should be
there.
This patch-set holds off creating symbolic link from node to cpu
until node is onlined.
This removes node arguments from register_cpu().
Now, register_cpu() requires 'struct node' as its argument. But the array of
struct node is now unified in driver/base/node.c now (By Goto's node hotplug
patch). We can get struct node in generic way. So, this argument is not
necessary now.
This patch also guarantees add cpu under node only when node is onlined. It
is necessary for node-hot-add vs. cpu-hot-add patch following this.
Moreover, register_cpu calculates cpu->node_id by cpu_to_node() without regard
to its 'struct node *root' argument. This patch removes it.
Also modify callers of register_cpu()/unregister_cpu, whose args are changed
by register-cpu-remove-node-struct patch.
[Brice.Goglin@ens-lyon.org: fix it]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-27 17:53:41 +08:00
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extern void unregister_cpu(struct cpu *cpu);
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2009-11-26 01:23:25 +08:00
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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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2005-04-17 06:20:36 +08:00
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#endif
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struct notifier_block;
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2012-01-26 07:09:14 +08:00
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#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
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extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env);
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extern ssize_t arch_print_cpu_modalias(struct device *dev,
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struct device_attribute *attr,
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char *bufptr);
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#endif
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2010-06-09 03:40:36 +08:00
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/*
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* CPU notifier priorities.
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*/
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enum {
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2010-06-09 03:40:36 +08:00
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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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2010-06-09 03:40:36 +08:00
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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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2010-06-29 16:07:12 +08:00
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/* prepare workqueues for other notifiers */
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CPU_PRI_WORKQUEUE = 5,
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2010-06-09 03:40:36 +08:00
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};
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2011-07-26 08:13:08 +08:00
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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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/* 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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2005-04-17 06:20:36 +08:00
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#ifdef CONFIG_SMP
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/* Need to know about CPUs going up/down? */
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2009-08-16 00:53:47 +08:00
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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 __cpuinitdata = \
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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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#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
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2006-06-27 17:54:08 +08:00
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#ifdef CONFIG_HOTPLUG_CPU
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[PATCH] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU
The following patchset allows a host with running virtual machines to be
suspended and, on at least a subset of the machines tested, resumed. Note
that this is orthogonal to suspending and resuming an individual guest to a
file.
A side effect of implementing suspend/resume is that cpu hotplug is now
supported. This should please the owners of big iron.
This patch:
KVM wants the cpu hotplug notifications, both for cpu hotplug itself, but more
commonly for host suspend/resume.
In order to avoid extensive #ifdefs, provide stubs when CONFIG_CPU_HOTPLUG is
not defined.
In all, we have four cases:
- UP: register and unregister stubbed out
- SMP+hotplug: full register and unregister
- SMP, no hotplug, core: register as __init, unregister stubbed
(cpus are brought up during core initialization)
- SMP, no hotplug, module: register and unregister stubbed out
(cpus cannot be brought up during module lifetime)
Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 16:54:43 +08:00
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extern int register_cpu_notifier(struct notifier_block *nb);
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2005-04-17 06:20:36 +08:00
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extern void unregister_cpu_notifier(struct notifier_block *nb);
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2006-06-27 17:54:08 +08:00
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#else
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[PATCH] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU
The following patchset allows a host with running virtual machines to be
suspended and, on at least a subset of the machines tested, resumed. Note
that this is orthogonal to suspending and resuming an individual guest to a
file.
A side effect of implementing suspend/resume is that cpu hotplug is now
supported. This should please the owners of big iron.
This patch:
KVM wants the cpu hotplug notifications, both for cpu hotplug itself, but more
commonly for host suspend/resume.
In order to avoid extensive #ifdefs, provide stubs when CONFIG_CPU_HOTPLUG is
not defined.
In all, we have four cases:
- UP: register and unregister stubbed out
- SMP+hotplug: full register and unregister
- SMP, no hotplug, core: register as __init, unregister stubbed
(cpus are brought up during core initialization)
- SMP, no hotplug, module: register and unregister stubbed out
(cpus cannot be brought up during module lifetime)
Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 16:54:43 +08:00
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#ifndef MODULE
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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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#endif
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2006-06-27 17:54:08 +08:00
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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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2005-04-17 06:20:36 +08:00
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int cpu_up(unsigned int cpu);
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2008-09-07 22:57:22 +08:00
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void notify_cpu_starting(unsigned int cpu);
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2008-07-25 16:47:50 +08:00
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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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2008-01-26 04:08:02 +08:00
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2008-07-25 16:47:50 +08:00
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#else /* CONFIG_SMP */
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2005-04-17 06:20:36 +08:00
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2009-08-16 00:53:47 +08:00
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#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
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2005-04-17 06:20:36 +08:00
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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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2008-01-26 04:08:02 +08:00
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2005-04-17 06:20:36 +08:00
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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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2008-07-25 16:47:50 +08:00
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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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2005-04-17 06:20:36 +08:00
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#endif /* CONFIG_SMP */
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2011-12-22 06:29:42 +08:00
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extern struct bus_type cpu_subsys;
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2005-04-17 06:20:36 +08:00
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#ifdef CONFIG_HOTPLUG_CPU
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/* Stop CPUs going up and down. */
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2006-12-07 12:38:58 +08:00
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2008-01-26 04:08:02 +08:00
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extern void get_online_cpus(void);
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extern void put_online_cpus(void);
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2009-08-16 00:53:47 +08:00
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#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
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2006-06-27 17:54:10 +08:00
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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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2005-04-17 06:20:36 +08:00
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int cpu_down(unsigned int cpu);
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2006-12-07 12:38:58 +08:00
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2009-11-26 17:59:05 +08:00
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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extern void cpu_hotplug_driver_lock(void);
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extern void cpu_hotplug_driver_unlock(void);
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#else
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static inline void cpu_hotplug_driver_lock(void)
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{
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}
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static inline void cpu_hotplug_driver_unlock(void)
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{
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}
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#endif
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2006-12-07 12:38:58 +08:00
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#else /* CONFIG_HOTPLUG_CPU */
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2008-01-26 04:08:02 +08:00
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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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2006-12-07 12:38:17 +08:00
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#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
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2007-10-18 18:06:38 +08:00
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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 unregister_hotcpu_notifier(nb) ({ (void)(nb); })
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2006-12-07 12:38:58 +08:00
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#endif /* CONFIG_HOTPLUG_CPU */
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2005-04-17 06:20:36 +08:00
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2007-08-31 14:56:29 +08:00
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#ifdef CONFIG_PM_SLEEP_SMP
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2006-09-26 14:32:48 +08:00
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extern int disable_nonboot_cpus(void);
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extern void enable_nonboot_cpus(void);
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2007-08-31 14:56:29 +08:00
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#else /* !CONFIG_PM_SLEEP_SMP */
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2006-09-26 14:32:48 +08:00
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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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2007-08-31 14:56:29 +08:00
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#endif /* !CONFIG_PM_SLEEP_SMP */
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2006-09-26 14:32:48 +08:00
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2005-04-17 06:20:36 +08:00
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#endif /* _LINUX_CPU_H_ */
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