[mirror_ubuntu-zesty-kernel.git] / arch / ppc64 / kernel / sysfs.c

#include <linux/config.h>
#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/systemcfg.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
/* default to snooze disabled */
DEFINE_PER_CPU(unsigned long, smt_snooze_delay);

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;
	unsigned int *val;
	unsigned int cpu;

	if (!cpu_has_feature(CPU_FTR_SMT))
		return 1;

	options = find_path_device("/options");
	if (!options)
		return 1;

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

	return 1;
}
__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_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;

#ifndef CONFIG_PPC_ISERIES
	if (cpu_has_feature(CPU_FTR_SMT))
		sysdev_create_file(s, &attr_smt_snooze_delay);
#endif

	/* 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_SMT))
		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->no_control);

#ifndef CONFIG_PPC_ISERIES
	if (cpu_has_feature(CPU_FTR_SMT))
		sysdev_remove_file(s, &attr_smt_snooze_delay);
#endif

	/* 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_SMT))
		sysdev_remove_file(s, &attr_purr);
}
#endif /* CONFIG_HOTPLUG_CPU */

static int __devinit 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 __devinitdata sysfs_cpu_nb = {
	.notifier_call	= sysfs_cpu_notify,
};

/* NUMA stuff */

#ifdef CONFIG_NUMA
static struct node node_devices[MAX_NUMNODES];

static void register_nodes(void)
{
	int i;

	for (i = 0; i < MAX_NUMNODES; i++) {
		if (node_online(i)) {
			int p_node = parent_node(i);
			struct node *parent = NULL;

			if (p_node != i)
				parent = &node_devices[p_node];

			register_node(&node_devices[i], i, parent);
		}
	}
}
#else
static void register_nodes(void)
{
	return;
}
#endif

/* 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;
	struct node *parent = NULL;

	register_nodes();

	register_cpu_notifier(&sysfs_cpu_nb);

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

#ifdef CONFIG_NUMA
		/* The node to which a cpu belongs can't be known
		 * until the cpu is made present.
		 */
		parent = NULL;
		if (cpu_present(cpu))
			parent = &node_devices[cpu_to_node(cpu)];
#endif
		/*
		 * 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->no_control = 1;

		if (cpu_online(cpu) || (c->no_control == 0)) {
			register_cpu(c, cpu, parent);

			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/config.h>
	2	#include <linux/sysdev.h>
	3	#include <linux/cpu.h>
	4	#include <linux/smp.h>
	5	#include <linux/percpu.h>
	6	#include <linux/init.h>
	7	#include <linux/sched.h>
	8	#include <linux/module.h>
	9	#include <linux/nodemask.h>
	10	#include <linux/cpumask.h>
	11	#include <linux/notifier.h>
	12
	13	#include <asm/current.h>
	14	#include <asm/processor.h>
	15	#include <asm/cputable.h>
1ababe11	16	#include <asm/firmware.h>
1da177e4 LT	17	#include <asm/hvcall.h>
	18	#include <asm/prom.h>
	19	#include <asm/systemcfg.h>
	20	#include <asm/paca.h>
	21	#include <asm/lppaca.h>
	22	#include <asm/machdep.h>
2249ca9d	23	#include <asm/smp.h>
1da177e4 LT	24
	25	static DEFINE_PER_CPU(struct cpu, cpu_devices);
	26
	27	/* SMT stuff */
	28
	29	#ifdef CONFIG_PPC_MULTIPLATFORM
	30	/* default to snooze disabled */
	31	DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
	32
	33	static ssize_t store_smt_snooze_delay(struct sys_device dev, const char buf,
	34	size_t count)
	35	{
	36	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	37	ssize_t ret;
	38	unsigned long snooze;
	39
	40	ret = sscanf(buf, "%lu", &snooze);
	41	if (ret != 1)
	42	return -EINVAL;
	43
	44	per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
	45
	46	return count;
	47	}
	48
	49	static ssize_t show_smt_snooze_delay(struct sys_device dev, char buf)
	50	{
	51	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	52
	53	return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
	54	}
	55
	56	static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
	57	store_smt_snooze_delay);
	58
	59	/* Only parse OF options if the matching cmdline option was not specified */
	60	static int smt_snooze_cmdline;
	61
	62	static int __init smt_setup(void)
	63	{
	64	struct device_node *options;
	65	unsigned int *val;
	66	unsigned int cpu;
	67
	68	if (!cpu_has_feature(CPU_FTR_SMT))
	69	return 1;
	70
	71	options = find_path_device("/options");
	72	if (!options)
	73	return 1;
	74
	75	val = (unsigned int *)get_property(options, "ibm,smt-snooze-delay",
	76	NULL);
	77	if (!smt_snooze_cmdline && val) {
	78	for_each_cpu(cpu)
	79	per_cpu(smt_snooze_delay, cpu) = *val;
	80	}
	81
	82	return 1;
	83	}
	84	__initcall(smt_setup);
	85
	86	static int __init setup_smt_snooze_delay(char *str)
	87	{
88	unsigned int cpu;
89	int snooze;
90
91	if (!cpu_has_feature(CPU_FTR_SMT))
92	return 1;
93
94	smt_snooze_cmdline = 1;
95
96	if (get_option(&str, &snooze)) {
97	for_each_cpu(cpu)
98	per_cpu(smt_snooze_delay, cpu) = snooze;
99	}
100
101	return 1;
102	}
103	__setup("smt-snooze-delay=", setup_smt_snooze_delay);
104
180a3362 ME	105	#endif /* CONFIG_PPC_MULTIPLATFORM */
180a3362 ME	106
1da177e4 LT	107	/*
	108	* Enabling PMCs will slow partition context switch times so we only do
	109	* it the first time we write to the PMCs.
	110	*/
	111
	112	static DEFINE_PER_CPU(char, pmcs_enabled);
	113
	114	void ppc64_enable_pmcs(void)
	115	{
1da177e4 LT	116	/* Only need to enable them once */
	117	if (__get_cpu_var(pmcs_enabled))
	118	return;
	119
	120	__get_cpu_var(pmcs_enabled) = 1;
	121
180a3362 ME	122	if (ppc_md.enable_pmcs)
180a3362 ME	123	ppc_md.enable_pmcs();
1da177e4	124	}
1da177e4 LT	125	EXPORT_SYMBOL(ppc64_enable_pmcs);
	126
	127	/* XXX convert to rusty's on_one_cpu */
	128	static unsigned long run_on_cpu(unsigned long cpu,
	129	unsigned long (*func)(unsigned long),
	130	unsigned long arg)
	131	{
	132	cpumask_t old_affinity = current->cpus_allowed;
	133	unsigned long ret;
	134
	135	/* should return -EINVAL to userspace */
	136	if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
	137	return 0;
	138
	139	ret = func(arg);
	140
	141	set_cpus_allowed(current, old_affinity);
	142
	143	return ret;
	144	}
	145
	146	#define SYSFS_PMCSETUP(NAME, ADDRESS) \
	147	static unsigned long read_##NAME(unsigned long junk) \
	148	{ \
	149	return mfspr(ADDRESS); \
	150	} \
	151	static unsigned long write_##NAME(unsigned long val) \
	152	{ \
	153	ppc64_enable_pmcs(); \
	154	mtspr(ADDRESS, val); \
	155	return 0; \
	156	} \
	157	static ssize_t show_##NAME(struct sys_device dev, char buf) \
	158	{ \
	159	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	160	unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
	161	return sprintf(buf, "%lx\n", val); \
	162	} \
	163	static ssize_t __attribute_used__ \
	164	store_##NAME(struct sys_device dev, const char buf, size_t count) \
	165	{ \
	166	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	167	unsigned long val; \
	168	int ret = sscanf(buf, "%lx", &val); \
	169	if (ret != 1) \
	170	return -EINVAL; \
	171	run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
	172	return count; \
	173	}
	174
	175	SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
	176	SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
	177	SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
	178	SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
	179	SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
	180	SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
	181	SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
	182	SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
	183	SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
	184	SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
	185	SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
	186	SYSFS_PMCSETUP(purr, SPRN_PURR);
	187
	188	static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
189	static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
190	static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
191	static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
192	static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
193	static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
194	static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
195	static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
196	static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
197	static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
198	static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
199	static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
200
201	static void register_cpu_online(unsigned int cpu)
202	{
203	struct cpu *c = &per_cpu(cpu_devices, cpu);
204	struct sys_device *s = &c->sysdev;
205
206	#ifndef CONFIG_PPC_ISERIES
207	if (cpu_has_feature(CPU_FTR_SMT))
208	sysdev_create_file(s, &attr_smt_snooze_delay);
209	#endif
210
211	/* PMC stuff */
212
213	sysdev_create_file(s, &attr_mmcr0);
214	sysdev_create_file(s, &attr_mmcr1);
215
216	if (cpu_has_feature(CPU_FTR_MMCRA))
217	sysdev_create_file(s, &attr_mmcra);
218
fd5b4377 AB	219	if (cur_cpu_spec->num_pmcs >= 1)
	220	sysdev_create_file(s, &attr_pmc1);
	221	if (cur_cpu_spec->num_pmcs >= 2)
	222	sysdev_create_file(s, &attr_pmc2);
	223	if (cur_cpu_spec->num_pmcs >= 3)
	224	sysdev_create_file(s, &attr_pmc3);
	225	if (cur_cpu_spec->num_pmcs >= 4)
	226	sysdev_create_file(s, &attr_pmc4);
	227	if (cur_cpu_spec->num_pmcs >= 5)
	228	sysdev_create_file(s, &attr_pmc5);
	229	if (cur_cpu_spec->num_pmcs >= 6)
	230	sysdev_create_file(s, &attr_pmc6);
	231	if (cur_cpu_spec->num_pmcs >= 7)
1da177e4	232	sysdev_create_file(s, &attr_pmc7);
fd5b4377	233	if (cur_cpu_spec->num_pmcs >= 8)
1da177e4	234	sysdev_create_file(s, &attr_pmc8);
fd5b4377	235
1da177e4 LT	236	if (cpu_has_feature(CPU_FTR_SMT))
	237	sysdev_create_file(s, &attr_purr);
	238	}
	239
	240	#ifdef CONFIG_HOTPLUG_CPU
	241	static void unregister_cpu_online(unsigned int cpu)
	242	{
	243	struct cpu *c = &per_cpu(cpu_devices, cpu);
	244	struct sys_device *s = &c->sysdev;
	245
	246	BUG_ON(c->no_control);
	247
	248	#ifndef CONFIG_PPC_ISERIES
	249	if (cpu_has_feature(CPU_FTR_SMT))
	250	sysdev_remove_file(s, &attr_smt_snooze_delay);
	251	#endif
	252
	253	/* PMC stuff */
	254
	255	sysdev_remove_file(s, &attr_mmcr0);
	256	sysdev_remove_file(s, &attr_mmcr1);
	257
	258	if (cpu_has_feature(CPU_FTR_MMCRA))
	259	sysdev_remove_file(s, &attr_mmcra);
	260
fd5b4377 AB	261	if (cur_cpu_spec->num_pmcs >= 1)
	262	sysdev_remove_file(s, &attr_pmc1);
	263	if (cur_cpu_spec->num_pmcs >= 2)
	264	sysdev_remove_file(s, &attr_pmc2);
	265	if (cur_cpu_spec->num_pmcs >= 3)
	266	sysdev_remove_file(s, &attr_pmc3);
	267	if (cur_cpu_spec->num_pmcs >= 4)
	268	sysdev_remove_file(s, &attr_pmc4);
	269	if (cur_cpu_spec->num_pmcs >= 5)
	270	sysdev_remove_file(s, &attr_pmc5);
	271	if (cur_cpu_spec->num_pmcs >= 6)
	272	sysdev_remove_file(s, &attr_pmc6);
	273	if (cur_cpu_spec->num_pmcs >= 7)
1da177e4	274	sysdev_remove_file(s, &attr_pmc7);
fd5b4377	275	if (cur_cpu_spec->num_pmcs >= 8)
1da177e4	276	sysdev_remove_file(s, &attr_pmc8);
1da177e4 LT	277
	278	if (cpu_has_feature(CPU_FTR_SMT))
	279	sysdev_remove_file(s, &attr_purr);
	280	}
	281	#endif /* CONFIG_HOTPLUG_CPU */
	282
	283	static int __devinit sysfs_cpu_notify(struct notifier_block *self,
	284	unsigned long action, void *hcpu)
	285	{
	286	unsigned int cpu = (unsigned int)(long)hcpu;
	287
	288	switch (action) {
	289	case CPU_ONLINE:
	290	register_cpu_online(cpu);
	291	break;
	292	#ifdef CONFIG_HOTPLUG_CPU
	293	case CPU_DEAD:
	294	unregister_cpu_online(cpu);
	295	break;
	296	#endif
	297	}
	298	return NOTIFY_OK;
	299	}
	300
	301	static struct notifier_block __devinitdata sysfs_cpu_nb = {
	302	.notifier_call = sysfs_cpu_notify,
	303	};
	304
	305	/* NUMA stuff */
	306
	307	#ifdef CONFIG_NUMA
	308	static struct node node_devices[MAX_NUMNODES];
	309
	310	static void register_nodes(void)
	311	{
	312	int i;
	313
	314	for (i = 0; i < MAX_NUMNODES; i++) {
	315	if (node_online(i)) {
	316	int p_node = parent_node(i);
	317	struct node *parent = NULL;
	318
	319	if (p_node != i)
	320	parent = &node_devices[p_node];
	321
	322	register_node(&node_devices[i], i, parent);
	323	}
	324	}
	325	}
	326	#else
	327	static void register_nodes(void)
	328	{
	329	return;
	330	}
	331	#endif
	332
	333	/* Only valid if CPU is present. */
	334	static ssize_t show_physical_id(struct sys_device dev, char buf)
	335	{
	336	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	337
	338	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
	339	}
	340	static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
341
342	static int __init topology_init(void)
343	{
344	int cpu;
345	struct node *parent = NULL;
346
347	register_nodes();
348
349	register_cpu_notifier(&sysfs_cpu_nb);
350
351	for_each_cpu(cpu) {
352	struct cpu *c = &per_cpu(cpu_devices, cpu);
353
354	#ifdef CONFIG_NUMA
f5f1cc54 NL	355	/* The node to which a cpu belongs can't be known
	356	* until the cpu is made present.
	357	*/
	358	parent = NULL;
	359	if (cpu_present(cpu))
	360	parent = &node_devices[cpu_to_node(cpu)];
1da177e4 LT	361	#endif
	362	/*
	363	* For now, we just see if the system supports making
	364	* the RTAS calls for CPU hotplug. But, there may be a
	365	* more comprehensive way to do this for an individual
	366	* CPU. For instance, the boot cpu might never be valid
	367	* for hotplugging.
	368	*/
	369	if (!ppc_md.cpu_die)
	370	c->no_control = 1;
	371
	372	if (cpu_online(cpu) \|\| (c->no_control == 0)) {
	373	register_cpu(c, cpu, parent);
	374
	375	sysdev_create_file(&c->sysdev, &attr_physical_id);
	376	}
	377
	378	if (cpu_online(cpu))
	379	register_cpu_online(cpu);
	380	}
	381
	382	return 0;
	383	}
	384	__initcall(topology_init);