[GitHub/mt8127/android_kernel_alcatel_ttab.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,
				      struct sysdev_attribute *attr,
				      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,
				     struct sysdev_attribute *attr,
				     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 = of_find_node_by_path("/options");
	if (!options)
		return -ENODEV;

	val = of_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;
	}

	of_node_put(options);
	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, \
			struct sysdev_attribute *attr, \
			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 __used \
	store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
			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; \
}


/* Let's define all possible registers, we'll only hook up the ones
 * that are implemented on the current processor
 */

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);
SYSFS_PMCSETUP(spurr, SPRN_SPURR);
SYSFS_PMCSETUP(dscr, SPRN_DSCR);

SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);

#ifdef CONFIG_DEBUG_KERNEL
SYSFS_PMCSETUP(hid0, SPRN_HID0);
SYSFS_PMCSETUP(hid1, SPRN_HID1);
SYSFS_PMCSETUP(hid4, SPRN_HID4);
SYSFS_PMCSETUP(hid5, SPRN_HID5);
SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
#endif /* CONFIG_DEBUG_KERNEL */

static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);

static struct sysdev_attribute ibm_common_attrs[] = {
	_SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
	_SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
};

static struct sysdev_attribute ibm_pmc_attrs[] = {
	_SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
	_SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
	_SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
	_SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
	_SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
	_SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
	_SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
	_SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
};

static struct sysdev_attribute pa6t_attrs[] = {
	_SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
	_SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
	_SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
	_SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
	_SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
	_SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
	_SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
	_SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
#ifdef CONFIG_DEBUG_KERNEL
	_SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
	_SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
	_SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
	_SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
	_SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
	_SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
	_SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
	_SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
	_SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
	_SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
	_SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
	_SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
	_SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
	_SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
	_SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
	_SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
	_SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
	_SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
	_SYSDEV_ATTR(der, 0600, show_der, store_der),
	_SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
	_SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
	_SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
	_SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
	_SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
	_SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
	_SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
	_SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
	_SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
#endif /* CONFIG_DEBUG_KERNEL */
};


static void __cpuinit register_cpu_online(unsigned int cpu)
{
	struct cpu *c = &per_cpu(cpu_devices, cpu);
	struct sys_device *s = &c->sysdev;
	struct sysdev_attribute *attrs, *pmc_attrs;
	int i, nattrs;

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

	/* PMC stuff */
	switch (cur_cpu_spec->pmc_type) {
	case PPC_PMC_IBM:
		attrs = ibm_common_attrs;
		nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
		pmc_attrs = ibm_pmc_attrs;
		break;
	case PPC_PMC_PA6T:
		/* PA Semi starts counting at PMC0 */
		attrs = pa6t_attrs;
		nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
		pmc_attrs = NULL;
		break;
	default:
		attrs = NULL;
		nattrs = 0;
		pmc_attrs = NULL;
	}

	for (i = 0; i < nattrs; i++)
		sysdev_create_file(s, &attrs[i]);

	if (pmc_attrs)
		for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
			sysdev_create_file(s, &pmc_attrs[i]);

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

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

	if (cpu_has_feature(CPU_FTR_SPURR))
		sysdev_create_file(s, &attr_spurr);

	if (cpu_has_feature(CPU_FTR_DSCR))
		sysdev_create_file(s, &attr_dscr);
}

#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;
	struct sysdev_attribute *attrs, *pmc_attrs;
	int i, nattrs;

	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 */
	switch (cur_cpu_spec->pmc_type) {
	case PPC_PMC_IBM:
		attrs = ibm_common_attrs;
		nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
		pmc_attrs = ibm_pmc_attrs;
		break;
	case PPC_PMC_PA6T:
		/* PA Semi starts counting at PMC0 */
		attrs = pa6t_attrs;
		nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
		pmc_attrs = NULL;
		break;
	default:
		attrs = NULL;
		nattrs = 0;
		pmc_attrs = NULL;
	}

	for (i = 0; i < nattrs; i++)
		sysdev_remove_file(s, &attrs[i]);

	if (pmc_attrs)
		for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
			sysdev_remove_file(s, &pmc_attrs[i]);

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

	if (cpu_has_feature(CPU_FTR_PURR))
		sysdev_remove_file(s, &attr_purr);

	if (cpu_has_feature(CPU_FTR_SPURR))
		sysdev_remove_file(s, &attr_spurr);

	if (cpu_has_feature(CPU_FTR_DSCR))
		sysdev_remove_file(s, &attr_dscr);
}
#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:
	case CPU_ONLINE_FROZEN:
		register_cpu_online(cpu);
		break;
#ifdef CONFIG_HOTPLUG_CPU
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		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;
	int ret;

	mutex_lock(&cpu_mutex);

	for_each_possible_cpu(cpu) {
		sysdev = get_cpu_sysdev(cpu);
		ret = sysfs_create_group(&sysdev->kobj, attrs);
		WARN_ON(ret != 0);
	}

	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));
}
EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);

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));
}
EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);

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

#endif

/* Only valid if CPU is present. */
static ssize_t show_physical_id(struct sys_device *dev,
				struct sysdev_attribute *attr, 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;
}
subsys_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	30
4a0b2b4d AK	31	static ssize_t store_smt_snooze_delay(struct sys_device *dev,
	32	struct sysdev_attribute *attr,
	33	const char *buf,
1da177e4 LT	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
4a0b2b4d AK	49	static ssize_t show_smt_snooze_delay(struct sys_device *dev,
	50	struct sysdev_attribute *attr,
	51	char *buf)
1da177e4 LT	52	{
	53	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	54
	55	return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
	56	}
	57
	58	static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
	59	store_smt_snooze_delay);
	60
	61	/* Only parse OF options if the matching cmdline option was not specified */
	62	static int smt_snooze_cmdline;
	63
	64	static int __init smt_setup(void)
	65	{
	66	struct device_node *options;
a7f67bdf	67	const unsigned int *val;
1da177e4 LT	68	unsigned int cpu;
	69
	70	if (!cpu_has_feature(CPU_FTR_SMT))
69ed3324	71	return -ENODEV;
1da177e4	72
8c8dc322	73	options = of_find_node_by_path("/options");
1da177e4	74	if (!options)
69ed3324	75	return -ENODEV;
1da177e4	76
e2eb6392	77	val = of_get_property(options, "ibm,smt-snooze-delay", NULL);
1da177e4	78	if (!smt_snooze_cmdline && val) {
0e551954	79	for_each_possible_cpu(cpu)
1da177e4 LT	80	per_cpu(smt_snooze_delay, cpu) = *val;
	81	}
	82
8c8dc322	83	of_node_put(options);
69ed3324	84	return 0;
1da177e4 LT	85	}
	86	__initcall(smt_setup);
	87
	88	static int __init setup_smt_snooze_delay(char *str)
	89	{
	90	unsigned int cpu;
	91	int snooze;
	92
	93	if (!cpu_has_feature(CPU_FTR_SMT))
	94	return 1;
	95
	96	smt_snooze_cmdline = 1;
	97
	98	if (get_option(&str, &snooze)) {
0e551954	99	for_each_possible_cpu(cpu)
1da177e4 LT	100	per_cpu(smt_snooze_delay, cpu) = snooze;
	101	}
	102
	103	return 1;
	104	}
	105	__setup("smt-snooze-delay=", setup_smt_snooze_delay);
	106
180a3362 ME	107	#endif /* CONFIG_PPC_MULTIPLATFORM */
180a3362 ME	108
1da177e4 LT	109	/*
	110	* Enabling PMCs will slow partition context switch times so we only do
	111	* it the first time we write to the PMCs.
	112	*/
	113
	114	static DEFINE_PER_CPU(char, pmcs_enabled);
	115
	116	void ppc64_enable_pmcs(void)
	117	{
1da177e4 LT	118	/* Only need to enable them once */
	119	if (__get_cpu_var(pmcs_enabled))
	120	return;
	121
	122	__get_cpu_var(pmcs_enabled) = 1;
	123
180a3362 ME	124	if (ppc_md.enable_pmcs)
180a3362 ME	125	ppc_md.enable_pmcs();
1da177e4	126	}
1da177e4 LT	127	EXPORT_SYMBOL(ppc64_enable_pmcs);
	128
	129	/* XXX convert to rusty's on_one_cpu */
	130	static unsigned long run_on_cpu(unsigned long cpu,
	131	unsigned long (*func)(unsigned long),
	132	unsigned long arg)
	133	{
	134	cpumask_t old_affinity = current->cpus_allowed;
	135	unsigned long ret;
	136
	137	/* should return -EINVAL to userspace */
	138	if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
	139	return 0;
	140
	141	ret = func(arg);
	142
	143	set_cpus_allowed(current, old_affinity);
	144
	145	return ret;
	146	}
	147
	148	#define SYSFS_PMCSETUP(NAME, ADDRESS) \
	149	static unsigned long read_##NAME(unsigned long junk) \
	150	{ \
	151	return mfspr(ADDRESS); \
	152	} \
	153	static unsigned long write_##NAME(unsigned long val) \
	154	{ \
	155	ppc64_enable_pmcs(); \
	156	mtspr(ADDRESS, val); \
	157	return 0; \
	158	} \
4a0b2b4d AK	159	static ssize_t show_##NAME(struct sys_device *dev, \
	160	struct sysdev_attribute *attr, \
	161	char *buf) \
1da177e4 LT	162	{ \
	163	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	164	unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
	165	return sprintf(buf, "%lx\n", val); \
	166	} \
3ff6eecc	167	static ssize_t __used \
4a0b2b4d AK	168	store_##NAME(struct sys_device dev, struct sysdev_attribute attr, \
4a0b2b4d AK	169	const char *buf, size_t count) \
1da177e4 LT	170	{ \
	171	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	172	unsigned long val; \
	173	int ret = sscanf(buf, "%lx", &val); \
	174	if (ret != 1) \
	175	return -EINVAL; \
	176	run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
	177	return count; \
	178	}
	179
6529c13d OJ	180
	181	/* Let's define all possible registers, we'll only hook up the ones
	182	* that are implemented on the current processor
	183	*/
	184
1da177e4 LT	185	SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
	186	SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
	187	SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
	188	SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
	189	SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
	190	SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
	191	SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
	192	SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
	193	SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
	194	SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
	195	SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
	196	SYSFS_PMCSETUP(purr, SPRN_PURR);
f050982a	197	SYSFS_PMCSETUP(spurr, SPRN_SPURR);
4c198557	198	SYSFS_PMCSETUP(dscr, SPRN_DSCR);
1da177e4	199
25fc530e OJ	200	SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
	201	SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
	202	SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
	203	SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
	204	SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
	205	SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
6529c13d	206
2e1957fd OJ	207	#ifdef CONFIG_DEBUG_KERNEL
	208	SYSFS_PMCSETUP(hid0, SPRN_HID0);
	209	SYSFS_PMCSETUP(hid1, SPRN_HID1);
	210	SYSFS_PMCSETUP(hid4, SPRN_HID4);
	211	SYSFS_PMCSETUP(hid5, SPRN_HID5);
	212	SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
	213	SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
	214	SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
	215	SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
	216	SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
	217	SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
	218	SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
	219	SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
	220	SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
	221	SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
	222	SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
	223	SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
	224	SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
	225	SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
	226	SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
	227	SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
	228	SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
	229	SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
	230	SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
	231	SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
	232	SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
	233	SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
	234	SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
	235	SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
	236	#endif /* CONFIG_DEBUG_KERNEL */
6529c13d	237
1da177e4	238	static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
f050982a	239	static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
4c198557	240	static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
6529c13d OJ	241	static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
	242
	243	static struct sysdev_attribute ibm_common_attrs[] = {
	244	_SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
	245	_SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
	246	};
	247
	248	static struct sysdev_attribute ibm_pmc_attrs[] = {
	249	_SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
	250	_SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
	251	_SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
	252	_SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
	253	_SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
	254	_SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
	255	_SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
	256	_SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
	257	};
	258
	259	static struct sysdev_attribute pa6t_attrs[] = {
	260	_SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
	261	_SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
	262	_SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
	263	_SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
	264	_SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
	265	_SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
	266	_SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
	267	_SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
2e1957fd OJ	268	#ifdef CONFIG_DEBUG_KERNEL
	269	_SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
	270	_SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
	271	_SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
	272	_SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
	273	_SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
	274	_SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
	275	_SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
	276	_SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
	277	_SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
	278	_SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
	279	_SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
	280	_SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
	281	_SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
	282	_SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
	283	_SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
	284	_SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
	285	_SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
	286	_SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
	287	_SYSDEV_ATTR(der, 0600, show_der, store_der),
	288	_SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
	289	_SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
	290	_SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
	291	_SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
	292	_SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
	293	_SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
	294	_SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
	295	_SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
	296	_SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
	297	#endif /* CONFIG_DEBUG_KERNEL */
6529c13d OJ	298	};
6529c13d OJ	299
1da177e4	300
9ba1984e	301	static void __cpuinit register_cpu_online(unsigned int cpu)
1da177e4 LT	302	{
	303	struct cpu *c = &per_cpu(cpu_devices, cpu);
	304	struct sys_device *s = &c->sysdev;
6529c13d OJ	305	struct sysdev_attribute attrs, pmc_attrs;
6529c13d OJ	306	int i, nattrs;
1da177e4	307
ad5cb17f SR	308	if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
ad5cb17f SR	309	cpu_has_feature(CPU_FTR_SMT))
1da177e4	310	sysdev_create_file(s, &attr_smt_snooze_delay);
1da177e4 LT	311
1da177e4 LT	312	/* PMC stuff */
6529c13d OJ	313	switch (cur_cpu_spec->pmc_type) {
	314	case PPC_PMC_IBM:
	315	attrs = ibm_common_attrs;
	316	nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
	317	pmc_attrs = ibm_pmc_attrs;
	318	break;
	319	case PPC_PMC_PA6T:
	320	/* PA Semi starts counting at PMC0 */
	321	attrs = pa6t_attrs;
	322	nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
	323	pmc_attrs = NULL;
	324	break;
	325	default:
	326	attrs = NULL;
	327	nattrs = 0;
	328	pmc_attrs = NULL;
	329	}
	330
	331	for (i = 0; i < nattrs; i++)
	332	sysdev_create_file(s, &attrs[i]);
1da177e4	333
6529c13d OJ	334	if (pmc_attrs)
	335	for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
	336	sysdev_create_file(s, &pmc_attrs[i]);
1da177e4 LT	337
	338	if (cpu_has_feature(CPU_FTR_MMCRA))
	339	sysdev_create_file(s, &attr_mmcra);
	340
afd05423	341	if (cpu_has_feature(CPU_FTR_PURR))
1da177e4	342	sysdev_create_file(s, &attr_purr);
4c198557	343
f050982a AB	344	if (cpu_has_feature(CPU_FTR_SPURR))
	345	sysdev_create_file(s, &attr_spurr);
	346
4c198557 AB	347	if (cpu_has_feature(CPU_FTR_DSCR))
4c198557 AB	348	sysdev_create_file(s, &attr_dscr);
1da177e4 LT	349	}
	350
	351	#ifdef CONFIG_HOTPLUG_CPU
	352	static void unregister_cpu_online(unsigned int cpu)
	353	{
	354	struct cpu *c = &per_cpu(cpu_devices, cpu);
	355	struct sys_device *s = &c->sysdev;
6529c13d OJ	356	struct sysdev_attribute attrs, pmc_attrs;
6529c13d OJ	357	int i, nattrs;
1da177e4	358
72486f1f	359	BUG_ON(!c->hotpluggable);
1da177e4	360
ad5cb17f SR	361	if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
ad5cb17f SR	362	cpu_has_feature(CPU_FTR_SMT))
1da177e4	363	sysdev_remove_file(s, &attr_smt_snooze_delay);
1da177e4 LT	364
1da177e4 LT	365	/* PMC stuff */
6529c13d OJ	366	switch (cur_cpu_spec->pmc_type) {
	367	case PPC_PMC_IBM:
	368	attrs = ibm_common_attrs;
	369	nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
	370	pmc_attrs = ibm_pmc_attrs;
	371	break;
	372	case PPC_PMC_PA6T:
	373	/* PA Semi starts counting at PMC0 */
	374	attrs = pa6t_attrs;
	375	nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
	376	pmc_attrs = NULL;
	377	break;
	378	default:
	379	attrs = NULL;
	380	nattrs = 0;
	381	pmc_attrs = NULL;
	382	}
1da177e4	383
6529c13d OJ	384	for (i = 0; i < nattrs; i++)
	385	sysdev_remove_file(s, &attrs[i]);
	386
	387	if (pmc_attrs)
	388	for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
	389	sysdev_remove_file(s, &pmc_attrs[i]);
1da177e4 LT	390
	391	if (cpu_has_feature(CPU_FTR_MMCRA))
	392	sysdev_remove_file(s, &attr_mmcra);
	393
afd05423	394	if (cpu_has_feature(CPU_FTR_PURR))
1da177e4	395	sysdev_remove_file(s, &attr_purr);
4c198557	396
f050982a AB	397	if (cpu_has_feature(CPU_FTR_SPURR))
	398	sysdev_remove_file(s, &attr_spurr);
	399
4c198557 AB	400	if (cpu_has_feature(CPU_FTR_DSCR))
4c198557 AB	401	sysdev_remove_file(s, &attr_dscr);
1da177e4 LT	402	}
	403	#endif /* CONFIG_HOTPLUG_CPU */
	404
8c78f307	405	static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
1da177e4 LT	406	unsigned long action, void *hcpu)
	407	{
	408	unsigned int cpu = (unsigned int)(long)hcpu;
	409
	410	switch (action) {
	411	case CPU_ONLINE:
8bb78442	412	case CPU_ONLINE_FROZEN:
1da177e4 LT	413	register_cpu_online(cpu);
	414	break;
	415	#ifdef CONFIG_HOTPLUG_CPU
	416	case CPU_DEAD:
8bb78442	417	case CPU_DEAD_FROZEN:
1da177e4 LT	418	unregister_cpu_online(cpu);
	419	break;
	420	#endif
	421	}
	422	return NOTIFY_OK;
	423	}
	424
8c78f307	425	static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
1da177e4 LT	426	.notifier_call = sysfs_cpu_notify,
	427	};
	428
0344c6c5 CK	429	static DEFINE_MUTEX(cpu_mutex);
	430
	431	int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
	432	{
	433	int cpu;
	434
	435	mutex_lock(&cpu_mutex);
	436
	437	for_each_possible_cpu(cpu) {
	438	sysdev_create_file(get_cpu_sysdev(cpu), attr);
	439	}
	440
	441	mutex_unlock(&cpu_mutex);
	442	return 0;
	443	}
	444	EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
	445
	446	int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
	447	{
	448	int cpu;
	449	struct sys_device *sysdev;
6bcc4c01	450	int ret;
0344c6c5 CK	451
	452	mutex_lock(&cpu_mutex);
	453
	454	for_each_possible_cpu(cpu) {
	455	sysdev = get_cpu_sysdev(cpu);
6bcc4c01 OJ	456	ret = sysfs_create_group(&sysdev->kobj, attrs);
6bcc4c01 OJ	457	WARN_ON(ret != 0);
0344c6c5 CK	458	}
	459
	460	mutex_unlock(&cpu_mutex);
	461	return 0;
	462	}
	463	EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
	464
	465
	466	void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
	467	{
	468	int cpu;
	469
	470	mutex_lock(&cpu_mutex);
	471
	472	for_each_possible_cpu(cpu) {
	473	sysdev_remove_file(get_cpu_sysdev(cpu), attr);
	474	}
	475
	476	mutex_unlock(&cpu_mutex);
	477	}
	478	EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
	479
	480	void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
	481	{
	482	int cpu;
	483	struct sys_device *sysdev;
	484
	485	mutex_lock(&cpu_mutex);
	486
	487	for_each_possible_cpu(cpu) {
	488	sysdev = get_cpu_sysdev(cpu);
	489	sysfs_remove_group(&sysdev->kobj, attrs);
	490	}
	491
	492	mutex_unlock(&cpu_mutex);
	493	}
	494	EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
	495
	496
1da177e4 LT	497	/* NUMA stuff */
	498
	499	#ifdef CONFIG_NUMA
1da177e4 LT	500	static void register_nodes(void)
	501	{
	502	int i;
	503
0fc44159 YG	504	for (i = 0; i < MAX_NUMNODES; i++)
0fc44159 YG	505	register_one_node(i);
1da177e4	506	}
953039c8 JK	507
	508	int sysfs_add_device_to_node(struct sys_device *dev, int nid)
	509	{
	510	struct node *node = &node_devices[nid];
	511	return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
	512	kobject_name(&dev->kobj));
	513	}
12654f77	514	EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
953039c8 JK	515
	516	void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
	517	{
	518	struct node *node = &node_devices[nid];
	519	sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
	520	}
12654f77	521	EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
953039c8	522
1da177e4 LT	523	#else
	524	static void register_nodes(void)
	525	{
	526	return;
	527	}
953039c8	528
1da177e4 LT	529	#endif
	530
	531	/* Only valid if CPU is present. */
00bf6e90 SR	532	static ssize_t show_physical_id(struct sys_device *dev,
00bf6e90 SR	533	struct sysdev_attribute attr, char buf)
1da177e4 LT	534	{
	535	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
	536
	537	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
	538	}
	539	static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
	540
	541	static int __init topology_init(void)
	542	{
	543	int cpu;
1da177e4 LT	544
1da177e4 LT	545	register_nodes();
1da177e4 LT	546	register_cpu_notifier(&sysfs_cpu_nb);
1da177e4 LT	547
0e551954	548	for_each_possible_cpu(cpu) {
1da177e4 LT	549	struct cpu *c = &per_cpu(cpu_devices, cpu);
1da177e4 LT	550
1da177e4 LT	551	/*
	552	* For now, we just see if the system supports making
	553	* the RTAS calls for CPU hotplug. But, there may be a
	554	* more comprehensive way to do this for an individual
	555	* CPU. For instance, the boot cpu might never be valid
	556	* for hotplugging.
	557	*/
72486f1f SS	558	if (ppc_md.cpu_die)
72486f1f SS	559	c->hotpluggable = 1;
1da177e4	560
72486f1f	561	if (cpu_online(cpu) \|\| c->hotpluggable) {
76b67ed9	562	register_cpu(c, cpu);
1da177e4 LT	563
	564	sysdev_create_file(&c->sysdev, &attr_physical_id);
	565	}
	566
	567	if (cpu_online(cpu))
	568	register_cpu_online(cpu);
	569	}
	570
	571	return 0;
	572	}
e9e77ce8	573	subsys_initcall(topology_init);