[GitHub/mt8127/android_kernel_alcatel_ttab.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"

struct bus_type cpu_subsys = {
	.name = "cpu",
	.dev_name = "cpu",
};
EXPORT_SYMBOL_GPL(cpu_subsys);

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 ssize_t show_online(struct device *dev,
			   struct device_attribute *attr,
			   char *buf)
{
	struct cpu *cpu = container_of(dev, struct cpu, dev);

	return sprintf(buf, "%u\n", !!cpu_online(cpu->dev.id));
}

static ssize_t __ref store_online(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct cpu *cpu = container_of(dev, struct cpu, dev);
	int cpuid = cpu->dev.id;
	int from_nid, to_nid;
	ssize_t ret;

	cpu_hotplug_driver_lock();
	switch (buf[0]) {
	case '0':
		ret = cpu_down(cpuid);
		if (!ret)
			kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
		break;
	case '1':
		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);

		if (!ret)
			kobject_uevent(&dev->kobj, KOBJ_ONLINE);
		break;
	default:
		ret = -EINVAL;
	}
	cpu_hotplug_driver_unlock();

	if (ret >= 0)
		ret = count;
	return ret;
}
static DEVICE_ATTR(online, 0644, show_online, store_online);

static void __cpuinit register_cpu_control(struct cpu *cpu)
{
	device_create_file(&cpu->dev, &dev_attr_online);
}
void unregister_cpu(struct cpu *cpu)
{
	int logical_cpu = cpu->dev.id;

	unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));

	device_remove_file(&cpu->dev, &dev_attr_online);

	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 */

#else /* ... !CONFIG_HOTPLUG_CPU */
static inline void register_cpu_control(struct cpu *cpu)
{
}
#endif /* CONFIG_HOTPLUG_CPU */

#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;
#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	cpu->dev.bus->uevent = arch_cpu_uevent;
#endif
	error = device_register(&cpu->dev);
	if (!error && cpu->hotpluggable)
		register_cpu_control(cpu);
	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	struct bus_type cpu_subsys = {
af5ca3f4	20	.name = "cpu",
8a25a2fd	21	.dev_name = "cpu",
1da177e4	22	};
8a25a2fd	23	EXPORT_SYMBOL_GPL(cpu_subsys);
1da177e4	24
8a25a2fd	25	static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
ad74557a	26
1da177e4	27	#ifdef CONFIG_HOTPLUG_CPU
34640468 YI	28	static void change_cpu_under_node(struct cpu *cpu,
	29	unsigned int from_nid, unsigned int to_nid)
	30	{
	31	int cpuid = cpu->dev.id;
	32	unregister_cpu_under_node(cpuid, from_nid);
	33	register_cpu_under_node(cpuid, to_nid);
	34	cpu->node_id = to_nid;
	35	}
	36
8a25a2fd KS	37	static ssize_t show_online(struct device *dev,
8a25a2fd KS	38	struct device_attribute *attr,
4a0b2b4d	39	char *buf)
1da177e4	40	{
8a25a2fd	41	struct cpu *cpu = container_of(dev, struct cpu, dev);
1da177e4	42
8a25a2fd	43	return sprintf(buf, "%u\n", !!cpu_online(cpu->dev.id));
1da177e4 LT	44	}
1da177e4 LT	45
8a25a2fd KS	46	static ssize_t __ref store_online(struct device *dev,
	47	struct device_attribute *attr,
	48	const char *buf, size_t count)
1da177e4	49	{
8a25a2fd	50	struct cpu *cpu = container_of(dev, struct cpu, dev);
34640468 YI	51	int cpuid = cpu->dev.id;
34640468 YI	52	int from_nid, to_nid;
1da177e4 LT	53	ssize_t ret;
1da177e4 LT	54
51badebd	55	cpu_hotplug_driver_lock();
1da177e4 LT	56	switch (buf[0]) {
1da177e4 LT	57	case '0':
34640468	58	ret = cpu_down(cpuid);
1da177e4	59	if (!ret)
312c004d	60	kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
1da177e4 LT	61	break;
1da177e4 LT	62	case '1':
34640468 YI	63	from_nid = cpu_to_node(cpuid);
	64	ret = cpu_up(cpuid);
	65
	66	/*
	67	* When hot adding memory to memoryless node and enabling a cpu
	68	* on the node, node number of the cpu may internally change.
	69	*/
	70	to_nid = cpu_to_node(cpuid);
	71	if (from_nid != to_nid)
	72	change_cpu_under_node(cpu, from_nid, to_nid);
	73
fb69c390	74	if (!ret)
312c004d	75	kobject_uevent(&dev->kobj, KOBJ_ONLINE);
1da177e4 LT	76	break;
	77	default:
	78	ret = -EINVAL;
	79	}
51badebd	80	cpu_hotplug_driver_unlock();
1da177e4 LT	81
	82	if (ret >= 0)
	83	ret = count;
	84	return ret;
	85	}
8a25a2fd	86	static DEVICE_ATTR(online, 0644, show_online, store_online);
1da177e4	87
6c847402	88	static void __cpuinit register_cpu_control(struct cpu *cpu)
1da177e4	89	{
8a25a2fd	90	device_create_file(&cpu->dev, &dev_attr_online);
1da177e4	91	}
76b67ed9	92	void unregister_cpu(struct cpu *cpu)
1da177e4	93	{
8a25a2fd	94	int logical_cpu = cpu->dev.id;
1da177e4	95
76b67ed9 KH	96	unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
76b67ed9 KH	97
8a25a2fd	98	device_remove_file(&cpu->dev, &dev_attr_online);
1da177e4	99
8a25a2fd	100	device_unregister(&cpu->dev);
e37d05da	101	per_cpu(cpu_sys_devices, logical_cpu) = NULL;
1da177e4 LT	102	return;
1da177e4 LT	103	}
12633e80 NF	104
12633e80 NF	105	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
8a25a2fd KS	106	static ssize_t cpu_probe_store(struct device *dev,
8a25a2fd KS	107	struct device_attribute *attr,
67fc233f	108	const char *buf,
12633e80 NF	109	size_t count)
	110	{
	111	return arch_cpu_probe(buf, count);
	112	}
	113
8a25a2fd KS	114	static ssize_t cpu_release_store(struct device *dev,
8a25a2fd KS	115	struct device_attribute *attr,
67fc233f	116	const char *buf,
12633e80 NF	117	size_t count)
	118	{
	119	return arch_cpu_release(buf, count);
	120	}
	121
8a25a2fd KS	122	static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
8a25a2fd KS	123	static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
12633e80 NF	124	#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
12633e80 NF	125
1da177e4 LT	126	#else /* ... !CONFIG_HOTPLUG_CPU */
	127	static inline void register_cpu_control(struct cpu *cpu)
	128	{
	129	}
	130	#endif /* CONFIG_HOTPLUG_CPU */
	131
51be5606 VG	132	#ifdef CONFIG_KEXEC
	133	#include <linux/kexec.h>
	134
8a25a2fd	135	static ssize_t show_crash_notes(struct device dev, struct device_attribute attr,
4a0b2b4d	136	char *buf)
51be5606	137	{
8a25a2fd	138	struct cpu *cpu = container_of(dev, struct cpu, dev);
51be5606 VG	139	ssize_t rc;
	140	unsigned long long addr;
	141	int cpunum;
	142
8a25a2fd	143	cpunum = cpu->dev.id;
51be5606 VG	144
	145	/*
	146	* Might be reading other cpu's data based on which cpu read thread
	147	* has been scheduled. But cpu data (memory) is allocated once during
	148	* boot up and this data does not change there after. Hence this
	149	* operation should be safe. No locking required.
	150	*/
3b034b0d	151	addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
51be5606	152	rc = sprintf(buf, "%Lx\n", addr);
51be5606 VG	153	return rc;
51be5606 VG	154	}
8a25a2fd	155	static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
eca4549f ZY	156
	157	static ssize_t show_crash_notes_size(struct device *dev,
	158	struct device_attribute *attr,
	159	char *buf)
	160	{
	161	ssize_t rc;
	162
bcfb87fb	163	rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
eca4549f ZY	164	return rc;
	165	}
	166	static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
51be5606 VG	167	#endif
51be5606 VG	168
9d1fe323 MT	169	/*
	170	* Print cpu online, possible, present, and system maps
	171	*/
265d2e2e AK	172
265d2e2e AK	173	struct cpu_attr {
8a25a2fd	174	struct device_attribute attr;
265d2e2e AK	175	const struct cpumask const const map;
	176	};
	177
8a25a2fd KS	178	static ssize_t show_cpus_attr(struct device *dev,
8a25a2fd KS	179	struct device_attribute *attr,
265d2e2e	180	char *buf)
9d1fe323	181	{
265d2e2e AK	182	struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
265d2e2e AK	183	int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));
9d1fe323 MT	184
	185	buf[n++] = '\n';
	186	buf[n] = '\0';
	187	return n;
	188	}
	189
8a25a2fd KS	190	#define _CPU_ATTR(name, map) \
8a25a2fd KS	191	{ __ATTR(name, 0444, show_cpus_attr, NULL), map }
9d1fe323	192
8a25a2fd	193	/* Keep in sync with cpu_subsys_attrs */
265d2e2e AK	194	static struct cpu_attr cpu_attrs[] = {
	195	_CPU_ATTR(online, &cpu_online_mask),
	196	_CPU_ATTR(possible, &cpu_possible_mask),
	197	_CPU_ATTR(present, &cpu_present_mask),
	198	};
9d1fe323	199
e057d7ae MT	200	/*
	201	* Print values for NR_CPUS and offlined cpus
	202	*/
8a25a2fd KS	203	static ssize_t print_cpus_kernel_max(struct device *dev,
8a25a2fd KS	204	struct device_attribute attr, char buf)
e057d7ae	205	{
8fd2d2d5	206	int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
e057d7ae MT	207	return n;
e057d7ae MT	208	}
8a25a2fd	209	static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
e057d7ae MT	210
	211	/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
	212	unsigned int total_cpus;
	213
8a25a2fd KS	214	static ssize_t print_cpus_offline(struct device *dev,
8a25a2fd KS	215	struct device_attribute attr, char buf)
e057d7ae MT	216	{
	217	int n = 0, len = PAGE_SIZE-2;
	218	cpumask_var_t offline;
	219
	220	/* display offline cpus < nr_cpu_ids */
	221	if (!alloc_cpumask_var(&offline, GFP_KERNEL))
	222	return -ENOMEM;
cdc6e3d3	223	cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
e057d7ae MT	224	n = cpulist_scnprintf(buf, len, offline);
	225	free_cpumask_var(offline);
	226
	227	/* display offline cpus >= nr_cpu_ids */
	228	if (total_cpus && nr_cpu_ids < total_cpus) {
	229	if (n && n < len)
	230	buf[n++] = ',';
	231
	232	if (nr_cpu_ids == total_cpus-1)
	233	n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
	234	else
	235	n += snprintf(&buf[n], len - n, "%d-%d",
	236	nr_cpu_ids, total_cpus-1);
	237	}
	238
	239	n += snprintf(&buf[n], len - n, "\n");
	240	return n;
	241	}
8a25a2fd	242	static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);
e057d7ae	243
2885e25c GKH	244	static void cpu_device_release(struct device *dev)
	245	{
	246	/*
	247	* This is an empty function to prevent the driver core from spitting a
	248	* warning at us. Yes, I know this is directly opposite of what the
	249	* documentation for the driver core and kobjects say, and the author
	250	* of this code has already been publically ridiculed for doing
	251	* something as foolish as this. However, at this point in time, it is
	252	* the only way to handle the issue of statically allocated cpu
	253	* devices. The different architectures will have their cpu device
	254	* code reworked to properly handle this in the near future, so this
	255	* function will then be changed to correctly free up the memory held
	256	* by the cpu device.
	257	*
	258	* Never copy this way of doing things, or you too will be made fun of
30a4840a	259	* on the linux-kernel list, you have been warned.
2885e25c GKH	260	*/
	261	}
	262
1da177e4	263	/*
405ae7d3	264	* register_cpu - Setup a sysfs device for a CPU.
72486f1f SS	265	* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
72486f1f SS	266	* sysfs for this CPU.
1da177e4 LT	267	* @num - CPU number to use when creating the device.
	268	*
	269	* Initialize and register the CPU device.
	270	*/
33b5f31b	271	int __cpuinit register_cpu(struct cpu *cpu, int num)
1da177e4 LT	272	{
1da177e4 LT	273	int error;
76b67ed9	274
8a25a2fd	275	cpu->node_id = cpu_to_node(num);
29bb5d4f	276	memset(&cpu->dev, 0x00, sizeof(struct device));
8a25a2fd KS	277	cpu->dev.id = num;
8a25a2fd KS	278	cpu->dev.bus = &cpu_subsys;
2885e25c	279	cpu->dev.release = cpu_device_release;
fad12ac8 TR	280	#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	281	cpu->dev.bus->uevent = arch_cpu_uevent;
	282	#endif
8a25a2fd	283	error = device_register(&cpu->dev);
72486f1f	284	if (!error && cpu->hotpluggable)
1da177e4	285	register_cpu_control(cpu);
ad74557a	286	if (!error)
8a25a2fd	287	per_cpu(cpu_sys_devices, num) = &cpu->dev;
76b67ed9 KH	288	if (!error)
76b67ed9 KH	289	register_cpu_under_node(num, cpu_to_node(num));
51be5606 VG	290
	291	#ifdef CONFIG_KEXEC
	292	if (!error)
8a25a2fd	293	error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
eca4549f ZY	294	if (!error)
	295	error = device_create_file(&cpu->dev,
	296	&dev_attr_crash_notes_size);
51be5606	297	#endif
1da177e4 LT	298	return error;
	299	}
	300
8a25a2fd	301	struct device *get_cpu_device(unsigned cpu)
ad74557a	302	{
e37d05da MT	303	if (cpu < nr_cpu_ids && cpu_possible(cpu))
e37d05da MT	304	return per_cpu(cpu_sys_devices, cpu);
ad74557a AR	305	else
	306	return NULL;
	307	}
8a25a2fd KS	308	EXPORT_SYMBOL_GPL(get_cpu_device);
8a25a2fd KS	309
fad12ac8 TR	310	#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	311	static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL);
	312	#endif
	313
8a25a2fd KS	314	static struct attribute *cpu_root_attrs[] = {
	315	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
	316	&dev_attr_probe.attr,
	317	&dev_attr_release.attr,
	318	#endif
	319	&cpu_attrs[0].attr.attr,
	320	&cpu_attrs[1].attr.attr,
	321	&cpu_attrs[2].attr.attr,
	322	&dev_attr_kernel_max.attr,
	323	&dev_attr_offline.attr,
fad12ac8 TR	324	#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
	325	&dev_attr_modalias.attr,
	326	#endif
8a25a2fd KS	327	NULL
	328	};
	329
	330	static struct attribute_group cpu_root_attr_group = {
	331	.attrs = cpu_root_attrs,
	332	};
	333
	334	static const struct attribute_group *cpu_root_attr_groups[] = {
	335	&cpu_root_attr_group,
	336	NULL,
	337	};
1da177e4	338
2987557f JT	339	bool cpu_is_hotpluggable(unsigned cpu)
2987557f JT	340	{
7affca35 LT	341	struct device *dev = get_cpu_device(cpu);
7affca35 LT	342	return dev && container_of(dev, struct cpu, dev)->hotpluggable;
2987557f JT	343	}
	344	EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
	345
9f13a1fd BH	346	#ifdef CONFIG_GENERIC_CPU_DEVICES
	347	static DEFINE_PER_CPU(struct cpu, cpu_devices);
	348	#endif
	349
	350	static void __init cpu_dev_register_generic(void)
	351	{
	352	#ifdef CONFIG_GENERIC_CPU_DEVICES
	353	int i;
	354
	355	for_each_possible_cpu(i) {
	356	if (register_cpu(&per_cpu(cpu_devices, i), i))
	357	panic("Failed to register CPU device");
	358	}
	359	#endif
	360	}
	361
024f7846	362	void __init cpu_dev_init(void)
1da177e4	363	{
024f7846 BH	364	if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
024f7846 BH	365	panic("Failed to register CPU subsystem");
8a25a2fd	366
9f13a1fd	367	cpu_dev_register_generic();
1da177e4	368	}