[deliverable/linux.git] / arch / powerpc / kernel / sysfs.c

#include <linux/sysdev.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/nodemask.h>
#include <linux/cpumask.h>
#include <linux/notifier.h>

#include <asm/current.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/firmware.h>
#include <asm/hvcall.h>
#include <asm/prom.h>
#include <asm/paca.h>
#include <asm/lppaca.h>
#include <asm/machdep.h>
#include <asm/smp.h>

static DEFINE_PER_CPU(struct cpu, cpu_devices);

/* SMT stuff */

#ifdef CONFIG_PPC_MULTIPLATFORM
/* Time in microseconds we delay before sleeping in the idle loop */
DEFINE_PER_CPU(unsigned long, smt_snooze_delay) = { 100 };

static ssize_t store_smt_snooze_delay(struct sys_device *dev, const char *buf,
				      size_t count)
{
	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	ssize_t ret;
	unsigned long snooze;

	ret = sscanf(buf, "%lu", &snooze);
	if (ret != 1)
		return -EINVAL;

	per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;

	return count;
}

static ssize_t show_smt_snooze_delay(struct sys_device *dev, char *buf)
{
	struct cpu *cpu = container_of(dev, struct cpu, sysdev);

	return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
}

static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
		   store_smt_snooze_delay);

/* Only parse OF options if the matching cmdline option was not specified */
static int smt_snooze_cmdline;

static int __init smt_setup(void)
{
	struct device_node *options;
	const unsigned int *val;
	unsigned int cpu;

	if (!cpu_has_feature(CPU_FTR_SMT))
		return -ENODEV;

	options = find_path_device("/options");
	if (!options)
		return -ENODEV;

	val = get_property(options, "ibm,smt-snooze-delay", NULL);
	if (!smt_snooze_cmdline && val) {
		for_each_possible_cpu(cpu)
			per_cpu(smt_snooze_delay, cpu) = *val;
	}

	return 0;
}
__initcall(smt_setup);

static int __init setup_smt_snooze_delay(char *str)
{
	unsigned int cpu;
	int snooze;

	if (!cpu_has_feature(CPU_FTR_SMT))
		return 1;

	smt_snooze_cmdline = 1;

	if (get_option(&str, &snooze)) {
		for_each_possible_cpu(cpu)
			per_cpu(smt_snooze_delay, cpu) = snooze;
	}

	return 1;
}
__setup("smt-snooze-delay=", setup_smt_snooze_delay);

#endif /* CONFIG_PPC_MULTIPLATFORM */

/*
 * Enabling PMCs will slow partition context switch times so we only do
 * it the first time we write to the PMCs.
 */

static DEFINE_PER_CPU(char, pmcs_enabled);

void ppc64_enable_pmcs(void)
{
	/* Only need to enable them once */
	if (__get_cpu_var(pmcs_enabled))
		return;

	__get_cpu_var(pmcs_enabled) = 1;

	if (ppc_md.enable_pmcs)
		ppc_md.enable_pmcs();
}
EXPORT_SYMBOL(ppc64_enable_pmcs);

/* XXX convert to rusty's on_one_cpu */
static unsigned long run_on_cpu(unsigned long cpu,
			        unsigned long (*func)(unsigned long),
				unsigned long arg)
{
	cpumask_t old_affinity = current->cpus_allowed;
	unsigned long ret;

	/* should return -EINVAL to userspace */
	if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
		return 0;

	ret = func(arg);

	set_cpus_allowed(current, old_affinity);

	return ret;
}

#define SYSFS_PMCSETUP(NAME, ADDRESS) \
static unsigned long read_##NAME(unsigned long junk) \
{ \
	return mfspr(ADDRESS); \
} \
static unsigned long write_##NAME(unsigned long val) \
{ \
	ppc64_enable_pmcs(); \
	mtspr(ADDRESS, val); \
	return 0; \
} \
static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
{ \
	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
	return sprintf(buf, "%lx\n", val); \
} \
static ssize_t __attribute_used__ \
	store_##NAME(struct sys_device *dev, const char *buf, size_t count) \
{ \
	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	unsigned long val; \
	int ret = sscanf(buf, "%lx", &val); \
	if (ret != 1) \
		return -EINVAL; \
	run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
	return count; \
}

SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
SYSFS_PMCSETUP(purr, SPRN_PURR);

static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
static SYSDEV_ATTR(purr, 0600, show_purr, NULL);

static void register_cpu_online(unsigned int cpu)
{
	struct cpu *c = &per_cpu(cpu_devices, cpu);
	struct sys_device *s = &c->sysdev;

	if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
			cpu_has_feature(CPU_FTR_SMT))
		sysdev_create_file(s, &attr_smt_snooze_delay);

	/* PMC stuff */

	sysdev_create_file(s, &attr_mmcr0);
	sysdev_create_file(s, &attr_mmcr1);

	if (cpu_has_feature(CPU_FTR_MMCRA))
		sysdev_create_file(s, &attr_mmcra);

	if (cur_cpu_spec->num_pmcs >= 1)
		sysdev_create_file(s, &attr_pmc1);
	if (cur_cpu_spec->num_pmcs >= 2)
		sysdev_create_file(s, &attr_pmc2);
	if (cur_cpu_spec->num_pmcs >= 3)
		sysdev_create_file(s, &attr_pmc3);
	if (cur_cpu_spec->num_pmcs >= 4)
		sysdev_create_file(s, &attr_pmc4);
	if (cur_cpu_spec->num_pmcs >= 5)
		sysdev_create_file(s, &attr_pmc5);
	if (cur_cpu_spec->num_pmcs >= 6)
		sysdev_create_file(s, &attr_pmc6);
	if (cur_cpu_spec->num_pmcs >= 7)
		sysdev_create_file(s, &attr_pmc7);
	if (cur_cpu_spec->num_pmcs >= 8)
		sysdev_create_file(s, &attr_pmc8);

	if (cpu_has_feature(CPU_FTR_PURR))
		sysdev_create_file(s, &attr_purr);
}

#ifdef CONFIG_HOTPLUG_CPU
static void unregister_cpu_online(unsigned int cpu)
{
	struct cpu *c = &per_cpu(cpu_devices, cpu);
	struct sys_device *s = &c->sysdev;

	BUG_ON(!c->hotpluggable);

	if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
			cpu_has_feature(CPU_FTR_SMT))
		sysdev_remove_file(s, &attr_smt_snooze_delay);

	/* PMC stuff */

	sysdev_remove_file(s, &attr_mmcr0);
	sysdev_remove_file(s, &attr_mmcr1);

	if (cpu_has_feature(CPU_FTR_MMCRA))
		sysdev_remove_file(s, &attr_mmcra);

	if (cur_cpu_spec->num_pmcs >= 1)
		sysdev_remove_file(s, &attr_pmc1);
	if (cur_cpu_spec->num_pmcs >= 2)
		sysdev_remove_file(s, &attr_pmc2);
	if (cur_cpu_spec->num_pmcs >= 3)
		sysdev_remove_file(s, &attr_pmc3);
	if (cur_cpu_spec->num_pmcs >= 4)
		sysdev_remove_file(s, &attr_pmc4);
	if (cur_cpu_spec->num_pmcs >= 5)
		sysdev_remove_file(s, &attr_pmc5);
	if (cur_cpu_spec->num_pmcs >= 6)
		sysdev_remove_file(s, &attr_pmc6);
	if (cur_cpu_spec->num_pmcs >= 7)
		sysdev_remove_file(s, &attr_pmc7);
	if (cur_cpu_spec->num_pmcs >= 8)
		sysdev_remove_file(s, &attr_pmc8);

	if (cpu_has_feature(CPU_FTR_PURR))
		sysdev_remove_file(s, &attr_purr);
}
#endif /* CONFIG_HOTPLUG_CPU */

static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
				      unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned int)(long)hcpu;

	switch (action) {
	case CPU_ONLINE:
		register_cpu_online(cpu);
		break;
#ifdef CONFIG_HOTPLUG_CPU
	case CPU_DEAD:
		unregister_cpu_online(cpu);
		break;
#endif
	}
	return NOTIFY_OK;
}

static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
	.notifier_call	= sysfs_cpu_notify,
};

static DEFINE_MUTEX(cpu_mutex);

int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
{
	int cpu;

	mutex_lock(&cpu_mutex);

	for_each_possible_cpu(cpu) {
		sysdev_create_file(get_cpu_sysdev(cpu), attr);
	}

	mutex_unlock(&cpu_mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);

int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
{
	int cpu;
	struct sys_device *sysdev;

	mutex_lock(&cpu_mutex);

	for_each_possible_cpu(cpu) {
		sysdev = get_cpu_sysdev(cpu);
		sysfs_create_group(&sysdev->kobj, attrs);
	}

	mutex_unlock(&cpu_mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);


void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
{
	int cpu;

	mutex_lock(&cpu_mutex);

	for_each_possible_cpu(cpu) {
		sysdev_remove_file(get_cpu_sysdev(cpu), attr);
	}

	mutex_unlock(&cpu_mutex);
}
EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);

void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
{
	int cpu;
	struct sys_device *sysdev;

	mutex_lock(&cpu_mutex);

	for_each_possible_cpu(cpu) {
		sysdev = get_cpu_sysdev(cpu);
		sysfs_remove_group(&sysdev->kobj, attrs);
	}

	mutex_unlock(&cpu_mutex);
}
EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);


/* NUMA stuff */

#ifdef CONFIG_NUMA
static void register_nodes(void)
{
	int i;

	for (i = 0; i < MAX_NUMNODES; i++)
		register_one_node(i);
}

int sysfs_add_device_to_node(struct sys_device *dev, int nid)
{
	struct node *node = &node_devices[nid];
	return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
			kobject_name(&dev->kobj));
}

void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
{
	struct node *node = &node_devices[nid];
	sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
}

#else
static void register_nodes(void)
{
	return;
}

#endif

EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);

/* Only valid if CPU is present. */
static ssize_t show_physical_id(struct sys_device *dev, char *buf)
{
	struct cpu *cpu = container_of(dev, struct cpu, sysdev);

	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
}
static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);

static int __init topology_init(void)
{
	int cpu;

	register_nodes();
	register_cpu_notifier(&sysfs_cpu_nb);

	for_each_possible_cpu(cpu) {
		struct cpu *c = &per_cpu(cpu_devices, cpu);

		/*
		 * For now, we just see if the system supports making
		 * the RTAS calls for CPU hotplug.  But, there may be a
		 * more comprehensive way to do this for an individual
		 * CPU.  For instance, the boot cpu might never be valid
		 * for hotplugging.
		 */
		if (ppc_md.cpu_die)
			c->hotpluggable = 1;

		if (cpu_online(cpu) || c->hotpluggable) {
			register_cpu(c, cpu);

			sysdev_create_file(&c->sysdev, &attr_physical_id);
		}

		if (cpu_online(cpu))
			register_cpu_online(cpu);
	}

	return 0;
}
__initcall(topology_init);
Commit	Line	Data
1da177e4 LT	1	#include <linux/sysdev.h>
	2	#include <linux/cpu.h>
	3	#include <linux/smp.h>
	4	#include <linux/percpu.h>
	5	#include <linux/init.h>
	6	#include <linux/sched.h>
	7	#include <linux/module.h>
	8	#include <linux/nodemask.h>
	9	#include <linux/cpumask.h>
	10	#include <linux/notifier.h>
	11
	12	#include <asm/current.h>
	13	#include <asm/processor.h>
	14	#include <asm/cputable.h>
1ababe11	15	#include <asm/firmware.h>
1da177e4 LT	16	#include <asm/hvcall.h>
1da177e4 LT	17	#include <asm/prom.h>
1da177e4 LT	18	#include <asm/paca.h>
	19	#include <asm/lppaca.h>
	20	#include <asm/machdep.h>
2249ca9d	21	#include <asm/smp.h>
1da177e4 LT	22
	23	static DEFINE_PER_CPU(struct cpu, cpu_devices);
	24
	25	/* SMT stuff */
	26
	27	#ifdef CONFIG_PPC_MULTIPLATFORM
0ddd3e7d AB	28	/* Time in microseconds we delay before sleeping in the idle loop */
0ddd3e7d AB	29	DEFINE_PER_CPU(unsigned long, smt_snooze_delay) = { 100 };
1da177e4 LT	30
	31	static ssize_t store_smt_snooze_delay(struct sys_device dev, const char buf,
	32	size_t count)
	33	{
	34	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	35	ssize_t ret;
	36	unsigned long snooze;
	37
	38	ret = sscanf(buf, "%lu", &snooze);
	39	if (ret != 1)
	40	return -EINVAL;
	41
	42	per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
	43
	44	return count;
	45	}
	46
	47	static ssize_t show_smt_snooze_delay(struct sys_device dev, char buf)
	48	{
	49	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	50
	51	return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
	52	}
	53
	54	static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
	55	store_smt_snooze_delay);
	56
	57	/* Only parse OF options if the matching cmdline option was not specified */
	58	static int smt_snooze_cmdline;
	59
	60	static int __init smt_setup(void)
	61	{
	62	struct device_node *options;
a7f67bdf	63	const unsigned int *val;
1da177e4 LT	64	unsigned int cpu;
	65
	66	if (!cpu_has_feature(CPU_FTR_SMT))
69ed3324	67	return -ENODEV;
1da177e4 LT	68
	69	options = find_path_device("/options");
	70	if (!options)
69ed3324	71	return -ENODEV;
1da177e4	72
a7f67bdf	73	val = get_property(options, "ibm,smt-snooze-delay", NULL);
1da177e4	74	if (!smt_snooze_cmdline && val) {
0e551954	75	for_each_possible_cpu(cpu)
1da177e4 LT	76	per_cpu(smt_snooze_delay, cpu) = *val;
	77	}
	78
69ed3324	79	return 0;
1da177e4 LT	80	}
	81	__initcall(smt_setup);
	82
	83	static int __init setup_smt_snooze_delay(char *str)
	84	{
	85	unsigned int cpu;
	86	int snooze;
	87
	88	if (!cpu_has_feature(CPU_FTR_SMT))
	89	return 1;
	90
	91	smt_snooze_cmdline = 1;
	92
	93	if (get_option(&str, &snooze)) {
0e551954	94	for_each_possible_cpu(cpu)
1da177e4 LT	95	per_cpu(smt_snooze_delay, cpu) = snooze;
	96	}
	97
	98	return 1;
	99	}
	100	__setup("smt-snooze-delay=", setup_smt_snooze_delay);
	101
180a3362 ME	102	#endif /* CONFIG_PPC_MULTIPLATFORM */
180a3362 ME	103
1da177e4 LT	104	/*
	105	* Enabling PMCs will slow partition context switch times so we only do
	106	* it the first time we write to the PMCs.
	107	*/
	108
	109	static DEFINE_PER_CPU(char, pmcs_enabled);
	110
	111	void ppc64_enable_pmcs(void)
	112	{
1da177e4 LT	113	/* Only need to enable them once */
	114	if (__get_cpu_var(pmcs_enabled))
	115	return;
	116
	117	__get_cpu_var(pmcs_enabled) = 1;
	118
180a3362 ME	119	if (ppc_md.enable_pmcs)
180a3362 ME	120	ppc_md.enable_pmcs();
1da177e4	121	}
1da177e4 LT	122	EXPORT_SYMBOL(ppc64_enable_pmcs);
	123
	124	/* XXX convert to rusty's on_one_cpu */
	125	static unsigned long run_on_cpu(unsigned long cpu,
	126	unsigned long (*func)(unsigned long),
	127	unsigned long arg)
	128	{
	129	cpumask_t old_affinity = current->cpus_allowed;
	130	unsigned long ret;
	131
	132	/* should return -EINVAL to userspace */
	133	if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
	134	return 0;
	135
	136	ret = func(arg);
	137
	138	set_cpus_allowed(current, old_affinity);
	139
	140	return ret;
	141	}
	142
	143	#define SYSFS_PMCSETUP(NAME, ADDRESS) \
	144	static unsigned long read_##NAME(unsigned long junk) \
	145	{ \
	146	return mfspr(ADDRESS); \
	147	} \
	148	static unsigned long write_##NAME(unsigned long val) \
	149	{ \
	150	ppc64_enable_pmcs(); \
	151	mtspr(ADDRESS, val); \
	152	return 0; \
	153	} \
	154	static ssize_t show_##NAME(struct sys_device dev, char buf) \
	155	{ \
	156	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	157	unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
	158	return sprintf(buf, "%lx\n", val); \
	159	} \
	160	static ssize_t __attribute_used__ \
	161	store_##NAME(struct sys_device dev, const char buf, size_t count) \
	162	{ \
	163	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	164	unsigned long val; \
	165	int ret = sscanf(buf, "%lx", &val); \
	166	if (ret != 1) \
	167	return -EINVAL; \
	168	run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
	169	return count; \
	170	}
	171
	172	SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
	173	SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
	174	SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
	175	SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
	176	SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
	177	SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
	178	SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
	179	SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
	180	SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
	181	SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
	182	SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
	183	SYSFS_PMCSETUP(purr, SPRN_PURR);
	184
	185	static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
186	static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
187	static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
188	static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
189	static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
190	static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
191	static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
192	static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
193	static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
194	static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
195	static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
196	static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
197
198	static void register_cpu_online(unsigned int cpu)
199	{
200	struct cpu *c = &per_cpu(cpu_devices, cpu);
201	struct sys_device *s = &c->sysdev;
202
ad5cb17f SR	203	if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
ad5cb17f SR	204	cpu_has_feature(CPU_FTR_SMT))
1da177e4	205	sysdev_create_file(s, &attr_smt_snooze_delay);
1da177e4 LT	206
	207	/* PMC stuff */
	208
	209	sysdev_create_file(s, &attr_mmcr0);
	210	sysdev_create_file(s, &attr_mmcr1);
	211
	212	if (cpu_has_feature(CPU_FTR_MMCRA))
	213	sysdev_create_file(s, &attr_mmcra);
	214
fd5b4377 AB	215	if (cur_cpu_spec->num_pmcs >= 1)
	216	sysdev_create_file(s, &attr_pmc1);
	217	if (cur_cpu_spec->num_pmcs >= 2)
	218	sysdev_create_file(s, &attr_pmc2);
	219	if (cur_cpu_spec->num_pmcs >= 3)
	220	sysdev_create_file(s, &attr_pmc3);
	221	if (cur_cpu_spec->num_pmcs >= 4)
	222	sysdev_create_file(s, &attr_pmc4);
	223	if (cur_cpu_spec->num_pmcs >= 5)
	224	sysdev_create_file(s, &attr_pmc5);
	225	if (cur_cpu_spec->num_pmcs >= 6)
	226	sysdev_create_file(s, &attr_pmc6);
	227	if (cur_cpu_spec->num_pmcs >= 7)
1da177e4	228	sysdev_create_file(s, &attr_pmc7);
fd5b4377	229	if (cur_cpu_spec->num_pmcs >= 8)
1da177e4	230	sysdev_create_file(s, &attr_pmc8);
d3d2176a	231
afd05423	232	if (cpu_has_feature(CPU_FTR_PURR))
1da177e4 LT	233	sysdev_create_file(s, &attr_purr);
	234	}
	235
	236	#ifdef CONFIG_HOTPLUG_CPU
	237	static void unregister_cpu_online(unsigned int cpu)
	238	{
	239	struct cpu *c = &per_cpu(cpu_devices, cpu);
	240	struct sys_device *s = &c->sysdev;
	241
72486f1f	242	BUG_ON(!c->hotpluggable);
1da177e4	243
ad5cb17f SR	244	if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
ad5cb17f SR	245	cpu_has_feature(CPU_FTR_SMT))
1da177e4	246	sysdev_remove_file(s, &attr_smt_snooze_delay);
1da177e4 LT	247
	248	/* PMC stuff */
	249
	250	sysdev_remove_file(s, &attr_mmcr0);
	251	sysdev_remove_file(s, &attr_mmcr1);
	252
	253	if (cpu_has_feature(CPU_FTR_MMCRA))
	254	sysdev_remove_file(s, &attr_mmcra);
	255
fd5b4377 AB	256	if (cur_cpu_spec->num_pmcs >= 1)
	257	sysdev_remove_file(s, &attr_pmc1);
	258	if (cur_cpu_spec->num_pmcs >= 2)
	259	sysdev_remove_file(s, &attr_pmc2);
	260	if (cur_cpu_spec->num_pmcs >= 3)
	261	sysdev_remove_file(s, &attr_pmc3);
	262	if (cur_cpu_spec->num_pmcs >= 4)
	263	sysdev_remove_file(s, &attr_pmc4);
	264	if (cur_cpu_spec->num_pmcs >= 5)
	265	sysdev_remove_file(s, &attr_pmc5);
	266	if (cur_cpu_spec->num_pmcs >= 6)
	267	sysdev_remove_file(s, &attr_pmc6);
	268	if (cur_cpu_spec->num_pmcs >= 7)
1da177e4	269	sysdev_remove_file(s, &attr_pmc7);
fd5b4377	270	if (cur_cpu_spec->num_pmcs >= 8)
1da177e4	271	sysdev_remove_file(s, &attr_pmc8);
1da177e4	272
afd05423	273	if (cpu_has_feature(CPU_FTR_PURR))
1da177e4 LT	274	sysdev_remove_file(s, &attr_purr);
	275	}
	276	#endif /* CONFIG_HOTPLUG_CPU */
	277
8c78f307	278	static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
1da177e4 LT	279	unsigned long action, void *hcpu)
	280	{
	281	unsigned int cpu = (unsigned int)(long)hcpu;
	282
	283	switch (action) {
	284	case CPU_ONLINE:
	285	register_cpu_online(cpu);
	286	break;
	287	#ifdef CONFIG_HOTPLUG_CPU
	288	case CPU_DEAD:
	289	unregister_cpu_online(cpu);
	290	break;
	291	#endif
	292	}
	293	return NOTIFY_OK;
	294	}
	295
8c78f307	296	static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
1da177e4 LT	297	.notifier_call = sysfs_cpu_notify,
	298	};
	299
0344c6c5 CK	300	static DEFINE_MUTEX(cpu_mutex);
	301
	302	int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
	303	{
	304	int cpu;
	305
	306	mutex_lock(&cpu_mutex);
	307
	308	for_each_possible_cpu(cpu) {
	309	sysdev_create_file(get_cpu_sysdev(cpu), attr);
	310	}
	311
	312	mutex_unlock(&cpu_mutex);
	313	return 0;
	314	}
	315	EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
	316
	317	int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
	318	{
	319	int cpu;
	320	struct sys_device *sysdev;
	321
	322	mutex_lock(&cpu_mutex);
	323
	324	for_each_possible_cpu(cpu) {
	325	sysdev = get_cpu_sysdev(cpu);
	326	sysfs_create_group(&sysdev->kobj, attrs);
	327	}
	328
	329	mutex_unlock(&cpu_mutex);
	330	return 0;
	331	}
	332	EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
	333
	334
	335	void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
	336	{
	337	int cpu;
	338
	339	mutex_lock(&cpu_mutex);
	340
	341	for_each_possible_cpu(cpu) {
	342	sysdev_remove_file(get_cpu_sysdev(cpu), attr);
	343	}
	344
	345	mutex_unlock(&cpu_mutex);
	346	}
	347	EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
	348
	349	void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
	350	{
	351	int cpu;
	352	struct sys_device *sysdev;
	353
	354	mutex_lock(&cpu_mutex);
	355
	356	for_each_possible_cpu(cpu) {
	357	sysdev = get_cpu_sysdev(cpu);
	358	sysfs_remove_group(&sysdev->kobj, attrs);
	359	}
	360
	361	mutex_unlock(&cpu_mutex);
	362	}
	363	EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
364
365
1da177e4 LT	366	/* NUMA stuff */
	367
	368	#ifdef CONFIG_NUMA
1da177e4 LT	369	static void register_nodes(void)
	370	{
	371	int i;
	372
0fc44159 YG	373	for (i = 0; i < MAX_NUMNODES; i++)
0fc44159 YG	374	register_one_node(i);
1da177e4	375	}
953039c8 JK	376
	377	int sysfs_add_device_to_node(struct sys_device *dev, int nid)
	378	{
	379	struct node *node = &node_devices[nid];
	380	return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
	381	kobject_name(&dev->kobj));
	382	}
	383
	384	void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
	385	{
	386	struct node *node = &node_devices[nid];
	387	sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
	388	}
	389
1da177e4 LT	390	#else
	391	static void register_nodes(void)
	392	{
	393	return;
	394	}
953039c8	395
1da177e4 LT	396	#endif
1da177e4 LT	397
953039c8 JK	398	EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
	399	EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
	400
1da177e4 LT	401	/* Only valid if CPU is present. */
	402	static ssize_t show_physical_id(struct sys_device dev, char buf)
	403	{
	404	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	405
	406	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
	407	}
	408	static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
	409
	410	static int __init topology_init(void)
	411	{
	412	int cpu;
1da177e4 LT	413
1da177e4 LT	414	register_nodes();
1da177e4 LT	415	register_cpu_notifier(&sysfs_cpu_nb);
1da177e4 LT	416
0e551954	417	for_each_possible_cpu(cpu) {
1da177e4 LT	418	struct cpu *c = &per_cpu(cpu_devices, cpu);
1da177e4 LT	419
1da177e4 LT	420	/*
	421	* For now, we just see if the system supports making
	422	* the RTAS calls for CPU hotplug. But, there may be a
	423	* more comprehensive way to do this for an individual
	424	* CPU. For instance, the boot cpu might never be valid
	425	* for hotplugging.
	426	*/
72486f1f SS	427	if (ppc_md.cpu_die)
72486f1f SS	428	c->hotpluggable = 1;
1da177e4	429
72486f1f	430	if (cpu_online(cpu) \|\| c->hotpluggable) {
76b67ed9	431	register_cpu(c, cpu);
1da177e4 LT	432
	433	sysdev_create_file(&c->sysdev, &attr_physical_id);
	434	}
	435
	436	if (cpu_online(cpu))
	437	register_cpu_online(cpu);
	438	}
	439
	440	return 0;
	441	}
	442	__initcall(topology_init);