[deliverable/linux.git] / drivers / base / cpu.c

/*
 * CPU subsystem support
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/cpu.h>
#include <linux/topology.h>
#include <linux/device.h>
#include <linux/node.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/percpu.h>

#include "base.h"

static DEFINE_PER_CPU(struct device *, cpu_sys_devices);

#ifdef CONFIG_HOTPLUG_CPU
static void change_cpu_under_node(struct cpu *cpu,
			unsigned int from_nid, unsigned int to_nid)
{
	int cpuid = cpu->dev.id;
	unregister_cpu_under_node(cpuid, from_nid);
	register_cpu_under_node(cpuid, to_nid);
	cpu->node_id = to_nid;
}

static int __ref cpu_subsys_online(struct device *dev)
{
	struct cpu *cpu = container_of(dev, struct cpu, dev);
	int cpuid = dev->id;
	int from_nid, to_nid;
	int ret;

	cpu_hotplug_driver_lock();

	from_nid = cpu_to_node(cpuid);
	ret = cpu_up(cpuid);
	/*
	 * When hot adding memory to memoryless node and enabling a cpu
	 * on the node, node number of the cpu may internally change.
	 */
	to_nid = cpu_to_node(cpuid);
	if (from_nid != to_nid)
		change_cpu_under_node(cpu, from_nid, to_nid);

	cpu_hotplug_driver_unlock();
	return ret;
}

static int cpu_subsys_offline(struct device *dev)
{
	int ret;

	cpu_hotplug_driver_lock();
	ret = cpu_down(dev->id);
	cpu_hotplug_driver_unlock();
	return ret;
}

void unregister_cpu(struct cpu *cpu)
{
	int logical_cpu = cpu->dev.id;

	unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));

	device_unregister(&cpu->dev);
	per_cpu(cpu_sys_devices, logical_cpu) = NULL;
	return;
}

#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
static ssize_t cpu_probe_store(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf,
			       size_t count)
{
	return arch_cpu_probe(buf, count);
}

static ssize_t cpu_release_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf,
				 size_t count)
{
	return arch_cpu_release(buf, count);
}

static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */

#endif /* CONFIG_HOTPLUG_CPU */

struct bus_type cpu_subsys = {
	.name = "cpu",
	.dev_name = "cpu",
#ifdef CONFIG_HOTPLUG_CPU
	.online = cpu_subsys_online,
	.offline = cpu_subsys_offline,
#endif
};
EXPORT_SYMBOL_GPL(cpu_subsys);

#ifdef CONFIG_KEXEC
#include <linux/kexec.h>

static ssize_t show_crash_notes(struct device *dev, struct device_attribute *attr,
				char *buf)
{
	struct cpu *cpu = container_of(dev, struct cpu, dev);
	ssize_t rc;
	unsigned long long addr;
	int cpunum;

	cpunum = cpu->dev.id;

	/*
	 * Might be reading other cpu's data based on which cpu read thread
	 * has been scheduled. But cpu data (memory) is allocated once during
	 * boot up and this data does not change there after. Hence this
	 * operation should be safe. No locking required.
	 */
	addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
	rc = sprintf(buf, "%Lx\n", addr);
	return rc;
}
static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);

static ssize_t show_crash_notes_size(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	ssize_t rc;

	rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
	return rc;
}
static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
#endif

/*
 * Print cpu online, possible, present, and system maps
 */

struct cpu_attr {
	struct device_attribute attr;
	const struct cpumask *const * const map;
};

static ssize_t show_cpus_attr(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
	int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));

	buf[n++] = '\n';
	buf[n] = '\0';
	return n;
}

#define _CPU_ATTR(name, map) \
	{ __ATTR(name, 0444, show_cpus_attr, NULL), map }

/* Keep in sync with cpu_subsys_attrs */
static struct cpu_attr cpu_attrs[] = {
	_CPU_ATTR(online, &cpu_online_mask),
	_CPU_ATTR(possible, &cpu_possible_mask),
	_CPU_ATTR(present, &cpu_present_mask),
};

/*
 * Print values for NR_CPUS and offlined cpus
 */
static ssize_t print_cpus_kernel_max(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
	return n;
}
static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);

/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
unsigned int total_cpus;

static ssize_t print_cpus_offline(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	int n = 0, len = PAGE_SIZE-2;
	cpumask_var_t offline;

	/* display offline cpus < nr_cpu_ids */
	if (!alloc_cpumask_var(&offline, GFP_KERNEL))
		return -ENOMEM;
	cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
	n = cpulist_scnprintf(buf, len, offline);
	free_cpumask_var(offline);

	/* display offline cpus >= nr_cpu_ids */
	if (total_cpus && nr_cpu_ids < total_cpus) {
		if (n && n < len)
			buf[n++] = ',';

		if (nr_cpu_ids == total_cpus-1)
			n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
		else
			n += snprintf(&buf[n], len - n, "%d-%d",
						      nr_cpu_ids, total_cpus-1);
	}

	n += snprintf(&buf[n], len - n, "\n");
	return n;
}
static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);

static void cpu_device_release(struct device *dev)
{
	/*
	 * This is an empty function to prevent the driver core from spitting a
	 * warning at us.  Yes, I know this is directly opposite of what the
	 * documentation for the driver core and kobjects say, and the author
	 * of this code has already been publically ridiculed for doing
	 * something as foolish as this.  However, at this point in time, it is
	 * the only way to handle the issue of statically allocated cpu
	 * devices.  The different architectures will have their cpu device
	 * code reworked to properly handle this in the near future, so this
	 * function will then be changed to correctly free up the memory held
	 * by the cpu device.
	 *
	 * Never copy this way of doing things, or you too will be made fun of
	 * on the linux-kernel list, you have been warned.
	 */
}

/*
 * register_cpu - Setup a sysfs device for a CPU.
 * @cpu - cpu->hotpluggable field set to 1 will generate a control file in
 *	  sysfs for this CPU.
 * @num - CPU number to use when creating the device.
 *
 * Initialize and register the CPU device.
 */
int __cpuinit register_cpu(struct cpu *cpu, int num)
{
	int error;

	cpu->node_id = cpu_to_node(num);
	memset(&cpu->dev, 0x00, sizeof(struct device));
	cpu->dev.id = num;
	cpu->dev.bus = &cpu_subsys;
	cpu->dev.release = cpu_device_release;
	cpu->dev.offline_disabled = !cpu->hotpluggable;
#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	cpu->dev.bus->uevent = arch_cpu_uevent;
#endif
	error = device_register(&cpu->dev);
	if (!error)
		per_cpu(cpu_sys_devices, num) = &cpu->dev;
	if (!error)
		register_cpu_under_node(num, cpu_to_node(num));

#ifdef CONFIG_KEXEC
	if (!error)
		error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
	if (!error)
		error = device_create_file(&cpu->dev,
					   &dev_attr_crash_notes_size);
#endif
	return error;
}

struct device *get_cpu_device(unsigned cpu)
{
	if (cpu < nr_cpu_ids && cpu_possible(cpu))
		return per_cpu(cpu_sys_devices, cpu);
	else
		return NULL;
}
EXPORT_SYMBOL_GPL(get_cpu_device);

#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL);
#endif

static struct attribute *cpu_root_attrs[] = {
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
	&dev_attr_probe.attr,
	&dev_attr_release.attr,
#endif
	&cpu_attrs[0].attr.attr,
	&cpu_attrs[1].attr.attr,
	&cpu_attrs[2].attr.attr,
	&dev_attr_kernel_max.attr,
	&dev_attr_offline.attr,
#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	&dev_attr_modalias.attr,
#endif
	NULL
};

static struct attribute_group cpu_root_attr_group = {
	.attrs = cpu_root_attrs,
};

static const struct attribute_group *cpu_root_attr_groups[] = {
	&cpu_root_attr_group,
	NULL,
};

bool cpu_is_hotpluggable(unsigned cpu)
{
	struct device *dev = get_cpu_device(cpu);
	return dev && container_of(dev, struct cpu, dev)->hotpluggable;
}
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);

#ifdef CONFIG_GENERIC_CPU_DEVICES
static DEFINE_PER_CPU(struct cpu, cpu_devices);
#endif

static void __init cpu_dev_register_generic(void)
{
#ifdef CONFIG_GENERIC_CPU_DEVICES
	int i;

	for_each_possible_cpu(i) {
		if (register_cpu(&per_cpu(cpu_devices, i), i))
			panic("Failed to register CPU device");
	}
#endif
}

void __init cpu_dev_init(void)
{
	if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
		panic("Failed to register CPU subsystem");

	cpu_dev_register_generic();
}
Commit	Line	Data
1da177e4	1	/*
8a25a2fd	2	* CPU subsystem support
1da177e4 LT	3	*/
1da177e4 LT	4
024f7846	5	#include <linux/kernel.h>
1da177e4 LT	6	#include <linux/module.h>
1da177e4 LT	7	#include <linux/init.h>
f6a57033	8	#include <linux/sched.h>
1da177e4 LT	9	#include <linux/cpu.h>
	10	#include <linux/topology.h>
	11	#include <linux/device.h>
76b67ed9	12	#include <linux/node.h>
5a0e3ad6	13	#include <linux/gfp.h>
fad12ac8	14	#include <linux/slab.h>
9f13a1fd	15	#include <linux/percpu.h>
1da177e4	16
a1bdc7aa	17	#include "base.h"
1da177e4	18
8a25a2fd	19	static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
ad74557a	20
1da177e4	21	#ifdef CONFIG_HOTPLUG_CPU
34640468 YI	22	static void change_cpu_under_node(struct cpu *cpu,
	23	unsigned int from_nid, unsigned int to_nid)
	24	{
	25	int cpuid = cpu->dev.id;
	26	unregister_cpu_under_node(cpuid, from_nid);
	27	register_cpu_under_node(cpuid, to_nid);
	28	cpu->node_id = to_nid;
	29	}
	30
0902a904	31	static int __ref cpu_subsys_online(struct device *dev)
1da177e4	32	{
8a25a2fd	33	struct cpu *cpu = container_of(dev, struct cpu, dev);
0902a904 RW	34	int cpuid = dev->id;
	35	int from_nid, to_nid;
	36	int ret;
	37
	38	cpu_hotplug_driver_lock();
	39
	40	from_nid = cpu_to_node(cpuid);
	41	ret = cpu_up(cpuid);
	42	/*
	43	* When hot adding memory to memoryless node and enabling a cpu
	44	* on the node, node number of the cpu may internally change.
	45	*/
	46	to_nid = cpu_to_node(cpuid);
	47	if (from_nid != to_nid)
	48	change_cpu_under_node(cpu, from_nid, to_nid);
1da177e4	49
0902a904 RW	50	cpu_hotplug_driver_unlock();
0902a904 RW	51	return ret;
1da177e4 LT	52	}
1da177e4 LT	53
0902a904	54	static int cpu_subsys_offline(struct device *dev)
1da177e4	55	{
0902a904	56	int ret;
1da177e4	57
51badebd	58	cpu_hotplug_driver_lock();
0902a904	59	ret = cpu_down(dev->id);
51badebd	60	cpu_hotplug_driver_unlock();
1da177e4 LT	61	return ret;
1da177e4 LT	62	}
1da177e4	63
76b67ed9	64	void unregister_cpu(struct cpu *cpu)
1da177e4	65	{
8a25a2fd	66	int logical_cpu = cpu->dev.id;
1da177e4	67
76b67ed9 KH	68	unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
76b67ed9 KH	69
8a25a2fd	70	device_unregister(&cpu->dev);
e37d05da	71	per_cpu(cpu_sys_devices, logical_cpu) = NULL;
1da177e4 LT	72	return;
1da177e4 LT	73	}
12633e80 NF	74
12633e80 NF	75	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
8a25a2fd KS	76	static ssize_t cpu_probe_store(struct device *dev,
8a25a2fd KS	77	struct device_attribute *attr,
67fc233f	78	const char *buf,
12633e80 NF	79	size_t count)
	80	{
	81	return arch_cpu_probe(buf, count);
	82	}
	83
8a25a2fd KS	84	static ssize_t cpu_release_store(struct device *dev,
8a25a2fd KS	85	struct device_attribute *attr,
67fc233f	86	const char *buf,
12633e80 NF	87	size_t count)
	88	{
	89	return arch_cpu_release(buf, count);
	90	}
	91
8a25a2fd KS	92	static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
8a25a2fd KS	93	static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
12633e80 NF	94	#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
12633e80 NF	95
1da177e4 LT	96	#endif /* CONFIG_HOTPLUG_CPU */
1da177e4 LT	97
0902a904 RW	98	struct bus_type cpu_subsys = {
	99	.name = "cpu",
	100	.dev_name = "cpu",
	101	#ifdef CONFIG_HOTPLUG_CPU
	102	.online = cpu_subsys_online,
	103	.offline = cpu_subsys_offline,
	104	#endif
	105	};
	106	EXPORT_SYMBOL_GPL(cpu_subsys);
	107
51be5606 VG	108	#ifdef CONFIG_KEXEC
	109	#include <linux/kexec.h>
	110
8a25a2fd	111	static ssize_t show_crash_notes(struct device dev, struct device_attribute attr,
4a0b2b4d	112	char *buf)
51be5606	113	{
8a25a2fd	114	struct cpu *cpu = container_of(dev, struct cpu, dev);
51be5606 VG	115	ssize_t rc;
	116	unsigned long long addr;
	117	int cpunum;
	118
8a25a2fd	119	cpunum = cpu->dev.id;
51be5606 VG	120
	121	/*
	122	* Might be reading other cpu's data based on which cpu read thread
	123	* has been scheduled. But cpu data (memory) is allocated once during
	124	* boot up and this data does not change there after. Hence this
	125	* operation should be safe. No locking required.
	126	*/
3b034b0d	127	addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
51be5606	128	rc = sprintf(buf, "%Lx\n", addr);
51be5606 VG	129	return rc;
51be5606 VG	130	}
8a25a2fd	131	static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
eca4549f ZY	132
	133	static ssize_t show_crash_notes_size(struct device *dev,
	134	struct device_attribute *attr,
	135	char *buf)
	136	{
	137	ssize_t rc;
	138
bcfb87fb	139	rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
eca4549f ZY	140	return rc;
	141	}
	142	static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
51be5606 VG	143	#endif
51be5606 VG	144
9d1fe323 MT	145	/*
	146	* Print cpu online, possible, present, and system maps
	147	*/
265d2e2e AK	148
265d2e2e AK	149	struct cpu_attr {
8a25a2fd	150	struct device_attribute attr;
265d2e2e AK	151	const struct cpumask const const map;
	152	};
	153
8a25a2fd KS	154	static ssize_t show_cpus_attr(struct device *dev,
8a25a2fd KS	155	struct device_attribute *attr,
265d2e2e	156	char *buf)
9d1fe323	157	{
265d2e2e AK	158	struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
265d2e2e AK	159	int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));
9d1fe323 MT	160
	161	buf[n++] = '\n';
	162	buf[n] = '\0';
	163	return n;
	164	}
	165
8a25a2fd KS	166	#define _CPU_ATTR(name, map) \
8a25a2fd KS	167	{ __ATTR(name, 0444, show_cpus_attr, NULL), map }
9d1fe323	168
8a25a2fd	169	/* Keep in sync with cpu_subsys_attrs */
265d2e2e AK	170	static struct cpu_attr cpu_attrs[] = {
	171	_CPU_ATTR(online, &cpu_online_mask),
	172	_CPU_ATTR(possible, &cpu_possible_mask),
	173	_CPU_ATTR(present, &cpu_present_mask),
	174	};
9d1fe323	175
e057d7ae MT	176	/*
	177	* Print values for NR_CPUS and offlined cpus
	178	*/
8a25a2fd KS	179	static ssize_t print_cpus_kernel_max(struct device *dev,
8a25a2fd KS	180	struct device_attribute attr, char buf)
e057d7ae	181	{
8fd2d2d5	182	int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
e057d7ae MT	183	return n;
e057d7ae MT	184	}
8a25a2fd	185	static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
e057d7ae MT	186
	187	/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
	188	unsigned int total_cpus;
	189
8a25a2fd KS	190	static ssize_t print_cpus_offline(struct device *dev,
8a25a2fd KS	191	struct device_attribute attr, char buf)
e057d7ae MT	192	{
	193	int n = 0, len = PAGE_SIZE-2;
	194	cpumask_var_t offline;
	195
	196	/* display offline cpus < nr_cpu_ids */
	197	if (!alloc_cpumask_var(&offline, GFP_KERNEL))
	198	return -ENOMEM;
cdc6e3d3	199	cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
e057d7ae MT	200	n = cpulist_scnprintf(buf, len, offline);
	201	free_cpumask_var(offline);
	202
	203	/* display offline cpus >= nr_cpu_ids */
	204	if (total_cpus && nr_cpu_ids < total_cpus) {
	205	if (n && n < len)
	206	buf[n++] = ',';
	207
	208	if (nr_cpu_ids == total_cpus-1)
	209	n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
	210	else
	211	n += snprintf(&buf[n], len - n, "%d-%d",
	212	nr_cpu_ids, total_cpus-1);
	213	}
	214
	215	n += snprintf(&buf[n], len - n, "\n");
	216	return n;
	217	}
8a25a2fd	218	static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);
e057d7ae	219
2885e25c GKH	220	static void cpu_device_release(struct device *dev)
	221	{
	222	/*
	223	* This is an empty function to prevent the driver core from spitting a
	224	* warning at us. Yes, I know this is directly opposite of what the
	225	* documentation for the driver core and kobjects say, and the author
	226	* of this code has already been publically ridiculed for doing
	227	* something as foolish as this. However, at this point in time, it is
	228	* the only way to handle the issue of statically allocated cpu
	229	* devices. The different architectures will have their cpu device
	230	* code reworked to properly handle this in the near future, so this
	231	* function will then be changed to correctly free up the memory held
	232	* by the cpu device.
	233	*
	234	* Never copy this way of doing things, or you too will be made fun of
30a4840a	235	* on the linux-kernel list, you have been warned.
2885e25c GKH	236	*/
	237	}
	238
1da177e4	239	/*
405ae7d3	240	* register_cpu - Setup a sysfs device for a CPU.
72486f1f SS	241	* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
72486f1f SS	242	* sysfs for this CPU.
1da177e4 LT	243	* @num - CPU number to use when creating the device.
	244	*
	245	* Initialize and register the CPU device.
	246	*/
33b5f31b	247	int __cpuinit register_cpu(struct cpu *cpu, int num)
1da177e4 LT	248	{
1da177e4 LT	249	int error;
76b67ed9	250
8a25a2fd	251	cpu->node_id = cpu_to_node(num);
29bb5d4f	252	memset(&cpu->dev, 0x00, sizeof(struct device));
8a25a2fd KS	253	cpu->dev.id = num;
8a25a2fd KS	254	cpu->dev.bus = &cpu_subsys;
2885e25c	255	cpu->dev.release = cpu_device_release;
0902a904	256	cpu->dev.offline_disabled = !cpu->hotpluggable;
fad12ac8 TR	257	#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	258	cpu->dev.bus->uevent = arch_cpu_uevent;
	259	#endif
8a25a2fd	260	error = device_register(&cpu->dev);
ad74557a	261	if (!error)
8a25a2fd	262	per_cpu(cpu_sys_devices, num) = &cpu->dev;
76b67ed9 KH	263	if (!error)
76b67ed9 KH	264	register_cpu_under_node(num, cpu_to_node(num));
51be5606 VG	265
	266	#ifdef CONFIG_KEXEC
	267	if (!error)
8a25a2fd	268	error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
eca4549f ZY	269	if (!error)
	270	error = device_create_file(&cpu->dev,
	271	&dev_attr_crash_notes_size);
51be5606	272	#endif
1da177e4 LT	273	return error;
	274	}
	275
8a25a2fd	276	struct device *get_cpu_device(unsigned cpu)
ad74557a	277	{
e37d05da MT	278	if (cpu < nr_cpu_ids && cpu_possible(cpu))
e37d05da MT	279	return per_cpu(cpu_sys_devices, cpu);
ad74557a AR	280	else
	281	return NULL;
	282	}
8a25a2fd KS	283	EXPORT_SYMBOL_GPL(get_cpu_device);
8a25a2fd KS	284
fad12ac8 TR	285	#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	286	static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL);
	287	#endif
	288
8a25a2fd KS	289	static struct attribute *cpu_root_attrs[] = {
	290	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
	291	&dev_attr_probe.attr,
	292	&dev_attr_release.attr,
	293	#endif
	294	&cpu_attrs[0].attr.attr,
	295	&cpu_attrs[1].attr.attr,
	296	&cpu_attrs[2].attr.attr,
	297	&dev_attr_kernel_max.attr,
	298	&dev_attr_offline.attr,
fad12ac8 TR	299	#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	300	&dev_attr_modalias.attr,
	301	#endif
8a25a2fd KS	302	NULL
	303	};
	304
	305	static struct attribute_group cpu_root_attr_group = {
	306	.attrs = cpu_root_attrs,
	307	};
	308
	309	static const struct attribute_group *cpu_root_attr_groups[] = {
	310	&cpu_root_attr_group,
	311	NULL,
	312	};
1da177e4	313
2987557f JT	314	bool cpu_is_hotpluggable(unsigned cpu)
2987557f JT	315	{
7affca35 LT	316	struct device *dev = get_cpu_device(cpu);
7affca35 LT	317	return dev && container_of(dev, struct cpu, dev)->hotpluggable;
2987557f JT	318	}
	319	EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
	320
9f13a1fd BH	321	#ifdef CONFIG_GENERIC_CPU_DEVICES
	322	static DEFINE_PER_CPU(struct cpu, cpu_devices);
	323	#endif
	324
	325	static void __init cpu_dev_register_generic(void)
	326	{
	327	#ifdef CONFIG_GENERIC_CPU_DEVICES
	328	int i;
	329
	330	for_each_possible_cpu(i) {
	331	if (register_cpu(&per_cpu(cpu_devices, i), i))
	332	panic("Failed to register CPU device");
	333	}
	334	#endif
	335	}
	336
024f7846	337	void __init cpu_dev_init(void)
1da177e4	338	{
024f7846 BH	339	if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
024f7846 BH	340	panic("Failed to register CPU subsystem");
8a25a2fd	341
9f13a1fd	342	cpu_dev_register_generic();
1da177e4	343	}