[GitHub/mt8127/android_kernel_alcatel_ttab.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/hvcall.h>
#include <asm/prom.h>
#include <asm/systemcfg.h>
#include <asm/paca.h>
#include <asm/lppaca.h>
#include <asm/machdep.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);

/*
 * 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)
{
	unsigned long hid0;
#ifdef CONFIG_PPC_PSERIES
	unsigned long set, reset;
#endif /* CONFIG_PPC_PSERIES */

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

	__get_cpu_var(pmcs_enabled) = 1;

	switch (systemcfg->platform) {
	case PLATFORM_PSERIES:
	case PLATFORM_POWERMAC:
		hid0 = mfspr(HID0);
		hid0 |= 1UL << (63 - 20);

		/* POWER4 requires the following sequence */
		asm volatile(
			     "sync\n"
			     "mtspr	%1, %0\n"
			     "mfspr	%0, %1\n"
			     "mfspr	%0, %1\n"
			     "mfspr	%0, %1\n"
			     "mfspr	%0, %1\n"
			     "mfspr	%0, %1\n"
			     "mfspr	%0, %1\n"
			     "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
			     "memory");
		break;

#ifdef CONFIG_PPC_PSERIES
	case PLATFORM_PSERIES_LPAR:
		set = 1UL << 63;
		reset = 0;
		plpar_hcall_norets(H_PERFMON, set, reset);
		break;
#endif /* CONFIG_PPC_PSERIES */

	default:
		break;
	}

#ifdef CONFIG_PPC_PSERIES
	/* instruct hypervisor to maintain PMCs */
	if (ppc64_firmware_features & FW_FEATURE_SPLPAR)
		get_paca()->lppaca.pmcregs_in_use = 1;
#endif /* CONFIG_PPC_PSERIES */
}

#else

/* PMC stuff */
void ppc64_enable_pmcs(void)
{
	/* XXX Implement for iseries */
}
#endif /* CONFIG_PPC_MULTIPLATFORM */

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);

	sysdev_create_file(s, &attr_pmc1);
	sysdev_create_file(s, &attr_pmc2);
	sysdev_create_file(s, &attr_pmc3);
	sysdev_create_file(s, &attr_pmc4);
	sysdev_create_file(s, &attr_pmc5);
	sysdev_create_file(s, &attr_pmc6);

	if (cpu_has_feature(CPU_FTR_PMC8)) {
		sysdev_create_file(s, &attr_pmc7);
		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);

	sysdev_remove_file(s, &attr_pmc1);
	sysdev_remove_file(s, &attr_pmc2);
	sysdev_remove_file(s, &attr_pmc3);
	sysdev_remove_file(s, &attr_pmc4);
	sysdev_remove_file(s, &attr_pmc5);
	sysdev_remove_file(s, &attr_pmc6);

	if (cpu_has_feature(CPU_FTR_PMC8)) {
		sysdev_remove_file(s, &attr_pmc7);
		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>
	16	#include <asm/hvcall.h>
	17	#include <asm/prom.h>
	18	#include <asm/systemcfg.h>
	19	#include <asm/paca.h>
	20	#include <asm/lppaca.h>
	21	#include <asm/machdep.h>
	22
	23	static DEFINE_PER_CPU(struct cpu, cpu_devices);
	24
	25	/* SMT stuff */
	26
	27	#ifdef CONFIG_PPC_MULTIPLATFORM
	28	/* default to snooze disabled */
	29	DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
	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;
	63	unsigned int *val;
	64	unsigned int cpu;
65
66	if (!cpu_has_feature(CPU_FTR_SMT))
67	return 1;
68
69	options = find_path_device("/options");
70	if (!options)
71	return 1;
72
73	val = (unsigned int *)get_property(options, "ibm,smt-snooze-delay",
74	NULL);
75	if (!smt_snooze_cmdline && val) {
76	for_each_cpu(cpu)
77	per_cpu(smt_snooze_delay, cpu) = *val;
78	}
79
80	return 1;
81	}
82	__initcall(smt_setup);
83
84	static int __init setup_smt_snooze_delay(char *str)
85	{
86	unsigned int cpu;
87	int snooze;
88
89	if (!cpu_has_feature(CPU_FTR_SMT))
90	return 1;
91
92	smt_snooze_cmdline = 1;
93
94	if (get_option(&str, &snooze)) {
95	for_each_cpu(cpu)
96	per_cpu(smt_snooze_delay, cpu) = snooze;
97	}
98
99	return 1;
100	}
101	__setup("smt-snooze-delay=", setup_smt_snooze_delay);
102
103	/*
104	* Enabling PMCs will slow partition context switch times so we only do
105	* it the first time we write to the PMCs.
106	*/
107
108	static DEFINE_PER_CPU(char, pmcs_enabled);
109
110	void ppc64_enable_pmcs(void)
111	{
112	unsigned long hid0;
113	#ifdef CONFIG_PPC_PSERIES
114	unsigned long set, reset;
1da177e4 LT	115	#endif /* CONFIG_PPC_PSERIES */
	116
	117	/* Only need to enable them once */
	118	if (__get_cpu_var(pmcs_enabled))
	119	return;
	120
	121	__get_cpu_var(pmcs_enabled) = 1;
	122
	123	switch (systemcfg->platform) {
	124	case PLATFORM_PSERIES:
	125	case PLATFORM_POWERMAC:
	126	hid0 = mfspr(HID0);
	127	hid0 \|= 1UL << (63 - 20);
	128
	129	/* POWER4 requires the following sequence */
	130	asm volatile(
	131	"sync\n"
	132	"mtspr %1, %0\n"
	133	"mfspr %0, %1\n"
	134	"mfspr %0, %1\n"
	135	"mfspr %0, %1\n"
	136	"mfspr %0, %1\n"
	137	"mfspr %0, %1\n"
	138	"mfspr %0, %1\n"
	139	"isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
	140	"memory");
	141	break;
	142
	143	#ifdef CONFIG_PPC_PSERIES
	144	case PLATFORM_PSERIES_LPAR:
	145	set = 1UL << 63;
	146	reset = 0;
059e277e	147	plpar_hcall_norets(H_PERFMON, set, reset);
1da177e4 LT	148	break;
	149	#endif /* CONFIG_PPC_PSERIES */
	150
	151	default:
	152	break;
	153	}
	154
	155	#ifdef CONFIG_PPC_PSERIES
	156	/* instruct hypervisor to maintain PMCs */
7a6af5e3	157	if (ppc64_firmware_features & FW_FEATURE_SPLPAR)
1da177e4	158	get_paca()->lppaca.pmcregs_in_use = 1;
1da177e4 LT	159	#endif /* CONFIG_PPC_PSERIES */
	160	}
	161
	162	#else
	163
	164	/* PMC stuff */
	165	void ppc64_enable_pmcs(void)
	166	{
	167	/* XXX Implement for iseries */
	168	}
	169	#endif /* CONFIG_PPC_MULTIPLATFORM */
	170
	171	EXPORT_SYMBOL(ppc64_enable_pmcs);
	172
	173	/* XXX convert to rusty's on_one_cpu */
	174	static unsigned long run_on_cpu(unsigned long cpu,
	175	unsigned long (*func)(unsigned long),
	176	unsigned long arg)
	177	{
	178	cpumask_t old_affinity = current->cpus_allowed;
	179	unsigned long ret;
	180
	181	/* should return -EINVAL to userspace */
	182	if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
	183	return 0;
	184
	185	ret = func(arg);
	186
	187	set_cpus_allowed(current, old_affinity);
	188
	189	return ret;
	190	}
	191
	192	#define SYSFS_PMCSETUP(NAME, ADDRESS) \
	193	static unsigned long read_##NAME(unsigned long junk) \
	194	{ \
	195	return mfspr(ADDRESS); \
	196	} \
	197	static unsigned long write_##NAME(unsigned long val) \
	198	{ \
	199	ppc64_enable_pmcs(); \
	200	mtspr(ADDRESS, val); \
	201	return 0; \
	202	} \
	203	static ssize_t show_##NAME(struct sys_device dev, char buf) \
	204	{ \
	205	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	206	unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
	207	return sprintf(buf, "%lx\n", val); \
	208	} \
	209	static ssize_t __attribute_used__ \
	210	store_##NAME(struct sys_device dev, const char buf, size_t count) \
	211	{ \
	212	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
	213	unsigned long val; \
	214	int ret = sscanf(buf, "%lx", &val); \
	215	if (ret != 1) \
	216	return -EINVAL; \
	217	run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
	218	return count; \
	219	}
	220
	221	SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
	222	SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
223	SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
224	SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
225	SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
226	SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
227	SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
228	SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
229	SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
230	SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
231	SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
232	SYSFS_PMCSETUP(purr, SPRN_PURR);
233
234	static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
235	static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
236	static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
237	static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
238	static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
239	static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
240	static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
241	static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
242	static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
243	static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
244	static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
245	static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
246
247	static void register_cpu_online(unsigned int cpu)
248	{
249	struct cpu *c = &per_cpu(cpu_devices, cpu);
250	struct sys_device *s = &c->sysdev;
251
252	#ifndef CONFIG_PPC_ISERIES
253	if (cpu_has_feature(CPU_FTR_SMT))
254	sysdev_create_file(s, &attr_smt_snooze_delay);
255	#endif
256
257	/* PMC stuff */
258
259	sysdev_create_file(s, &attr_mmcr0);
260	sysdev_create_file(s, &attr_mmcr1);
261
262	if (cpu_has_feature(CPU_FTR_MMCRA))
263	sysdev_create_file(s, &attr_mmcra);
264
265	sysdev_create_file(s, &attr_pmc1);
266	sysdev_create_file(s, &attr_pmc2);
267	sysdev_create_file(s, &attr_pmc3);
268	sysdev_create_file(s, &attr_pmc4);
269	sysdev_create_file(s, &attr_pmc5);
270	sysdev_create_file(s, &attr_pmc6);
271
272	if (cpu_has_feature(CPU_FTR_PMC8)) {
273	sysdev_create_file(s, &attr_pmc7);
274	sysdev_create_file(s, &attr_pmc8);
275	}
276
277	if (cpu_has_feature(CPU_FTR_SMT))
278	sysdev_create_file(s, &attr_purr);
279	}
280
281	#ifdef CONFIG_HOTPLUG_CPU
282	static void unregister_cpu_online(unsigned int cpu)
283	{
284	struct cpu *c = &per_cpu(cpu_devices, cpu);
285	struct sys_device *s = &c->sysdev;
286
287	BUG_ON(c->no_control);
288
289	#ifndef CONFIG_PPC_ISERIES
290	if (cpu_has_feature(CPU_FTR_SMT))
291	sysdev_remove_file(s, &attr_smt_snooze_delay);
292	#endif
293
294	/* PMC stuff */
295
296	sysdev_remove_file(s, &attr_mmcr0);
297	sysdev_remove_file(s, &attr_mmcr1);
298
299	if (cpu_has_feature(CPU_FTR_MMCRA))
300	sysdev_remove_file(s, &attr_mmcra);
301
302	sysdev_remove_file(s, &attr_pmc1);
303	sysdev_remove_file(s, &attr_pmc2);
304	sysdev_remove_file(s, &attr_pmc3);
305	sysdev_remove_file(s, &attr_pmc4);
306	sysdev_remove_file(s, &attr_pmc5);
307	sysdev_remove_file(s, &attr_pmc6);
308
309	if (cpu_has_feature(CPU_FTR_PMC8)) {
310	sysdev_remove_file(s, &attr_pmc7);
311	sysdev_remove_file(s, &attr_pmc8);
312	}
313
314	if (cpu_has_feature(CPU_FTR_SMT))
315	sysdev_remove_file(s, &attr_purr);
316	}
317	#endif /* CONFIG_HOTPLUG_CPU */
318
319	static int __devinit sysfs_cpu_notify(struct notifier_block *self,
320	unsigned long action, void *hcpu)
321	{
322	unsigned int cpu = (unsigned int)(long)hcpu;
323
324	switch (action) {
325	case CPU_ONLINE:
326	register_cpu_online(cpu);
327	break;
328	#ifdef CONFIG_HOTPLUG_CPU
329	case CPU_DEAD:
330	unregister_cpu_online(cpu);
331	break;
332	#endif
333	}
334	return NOTIFY_OK;
335	}
336
337	static struct notifier_block __devinitdata sysfs_cpu_nb = {
338	.notifier_call = sysfs_cpu_notify,
339	};
340
341	/* NUMA stuff */
342
343	#ifdef CONFIG_NUMA
344	static struct node node_devices[MAX_NUMNODES];
345
346	static void register_nodes(void)
347	{
348	int i;
349
350	for (i = 0; i < MAX_NUMNODES; i++) {
351	if (node_online(i)) {
352	int p_node = parent_node(i);
353	struct node *parent = NULL;
354
355	if (p_node != i)
356	parent = &node_devices[p_node];
357
358	register_node(&node_devices[i], i, parent);
359	}
360	}
361	}
362	#else
363	static void register_nodes(void)
364	{
365	return;
366	}
367	#endif
368
369	/* Only valid if CPU is present. */
370	static ssize_t show_physical_id(struct sys_device dev, char buf)
371	{
372	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
373
374	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
375	}
376	static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
377
378	static int __init topology_init(void)
379	{
380	int cpu;
381	struct node *parent = NULL;
382
383	register_nodes();
384
385	register_cpu_notifier(&sysfs_cpu_nb);
386
387	for_each_cpu(cpu) {
388	struct cpu *c = &per_cpu(cpu_devices, cpu);
389
390	#ifdef CONFIG_NUMA
f5f1cc54 NL	391	/* The node to which a cpu belongs can't be known
	392	* until the cpu is made present.
	393	*/
	394	parent = NULL;
	395	if (cpu_present(cpu))
	396	parent = &node_devices[cpu_to_node(cpu)];
1da177e4 LT	397	#endif
	398	/*
	399	* For now, we just see if the system supports making
	400	* the RTAS calls for CPU hotplug. But, there may be a
	401	* more comprehensive way to do this for an individual
	402	* CPU. For instance, the boot cpu might never be valid
	403	* for hotplugging.
	404	*/
	405	if (!ppc_md.cpu_die)
	406	c->no_control = 1;
	407
	408	if (cpu_online(cpu) \|\| (c->no_control == 0)) {
	409	register_cpu(c, cpu, parent);
	410
	411	sysdev_create_file(&c->sysdev, &attr_physical_id);
	412	}
	413
	414	if (cpu_online(cpu))
	415	register_cpu_online(cpu);
	416	}
	417
	418	return 0;
	419	}
	420	__initcall(topology_init);