[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;
	int ret;
	unsigned int ctrl;
#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;
		ret = plpar_hcall_norets(H_PERFMON, set, reset);
		if (ret)
			printk(KERN_ERR "H_PERFMON call on cpu %u "
			       "returned %d\n",
			       smp_processor_id(), ret);
		break;
#endif /* CONFIG_PPC_PSERIES */

	default:
		break;
	}

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

	/*
	 * On SMT machines we have to set the run latch in the ctrl register
	 * in order to make PMC6 spin.
	 */
	if (cpu_has_feature(CPU_FTR_SMT)) {
		ctrl = mfspr(CTRLF);
		ctrl |= RUNLATCH;
		mtspr(CTRLT, ctrl);
	}
#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
		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;
115	int ret;
116	unsigned int ctrl;
117	#endif /* CONFIG_PPC_PSERIES */
118
119	/* Only need to enable them once */
120	if (__get_cpu_var(pmcs_enabled))
121	return;
122
123	__get_cpu_var(pmcs_enabled) = 1;
124
125	switch (systemcfg->platform) {
126	case PLATFORM_PSERIES:
127	case PLATFORM_POWERMAC:
128	hid0 = mfspr(HID0);
129	hid0 \|= 1UL << (63 - 20);
130
131	/* POWER4 requires the following sequence */
132	asm volatile(
133	"sync\n"
134	"mtspr %1, %0\n"
135	"mfspr %0, %1\n"
136	"mfspr %0, %1\n"
137	"mfspr %0, %1\n"
138	"mfspr %0, %1\n"
139	"mfspr %0, %1\n"
140	"mfspr %0, %1\n"
141	"isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
142	"memory");
143	break;
144
145	#ifdef CONFIG_PPC_PSERIES
146	case PLATFORM_PSERIES_LPAR:
147	set = 1UL << 63;
148	reset = 0;
149	ret = plpar_hcall_norets(H_PERFMON, set, reset);
150	if (ret)
151	printk(KERN_ERR "H_PERFMON call on cpu %u "
152	"returned %d\n",
153	smp_processor_id(), ret);
154	break;
155	#endif /* CONFIG_PPC_PSERIES */
156
157	default:
158	break;
159	}
160
161	#ifdef CONFIG_PPC_PSERIES
162	/* instruct hypervisor to maintain PMCs */
163	if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
164	get_paca()->lppaca.pmcregs_in_use = 1;
165
166	/*
167	* On SMT machines we have to set the run latch in the ctrl register
168	* in order to make PMC6 spin.
169	*/
170	if (cpu_has_feature(CPU_FTR_SMT)) {
171	ctrl = mfspr(CTRLF);
172	ctrl \|= RUNLATCH;
173	mtspr(CTRLT, ctrl);
174	}
175	#endif /* CONFIG_PPC_PSERIES */
176	}
177
178	#else
179
180	/* PMC stuff */
181	void ppc64_enable_pmcs(void)
182	{
183	/* XXX Implement for iseries */
184	}
185	#endif /* CONFIG_PPC_MULTIPLATFORM */
186
187	EXPORT_SYMBOL(ppc64_enable_pmcs);
188
189	/* XXX convert to rusty's on_one_cpu */
190	static unsigned long run_on_cpu(unsigned long cpu,
191	unsigned long (*func)(unsigned long),
192	unsigned long arg)
193	{
194	cpumask_t old_affinity = current->cpus_allowed;
195	unsigned long ret;
196
197	/* should return -EINVAL to userspace */
198	if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
199	return 0;
200
201	ret = func(arg);
202
203	set_cpus_allowed(current, old_affinity);
204
205	return ret;
206	}
207
208	#define SYSFS_PMCSETUP(NAME, ADDRESS) \
209	static unsigned long read_##NAME(unsigned long junk) \
210	{ \
211	return mfspr(ADDRESS); \
212	} \
213	static unsigned long write_##NAME(unsigned long val) \
214	{ \
215	ppc64_enable_pmcs(); \
216	mtspr(ADDRESS, val); \
217	return 0; \
218	} \
219	static ssize_t show_##NAME(struct sys_device dev, char buf) \
220	{ \
221	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
222	unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
223	return sprintf(buf, "%lx\n", val); \
224	} \
225	static ssize_t __attribute_used__ \
226	store_##NAME(struct sys_device dev, const char buf, size_t count) \
227	{ \
228	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
229	unsigned long val; \
230	int ret = sscanf(buf, "%lx", &val); \
231	if (ret != 1) \
232	return -EINVAL; \
233	run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
234	return count; \
235	}
236
237	SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
238	SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
239	SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
240	SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
241	SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
242	SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
243	SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
244	SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
245	SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
246	SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
247	SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
248	SYSFS_PMCSETUP(purr, SPRN_PURR);
249
250	static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
251	static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
252	static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
253	static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
254	static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
255	static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
256	static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
257	static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
258	static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
259	static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
260	static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
261	static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
262
263	static void register_cpu_online(unsigned int cpu)
264	{
265	struct cpu *c = &per_cpu(cpu_devices, cpu);
266	struct sys_device *s = &c->sysdev;
267
268	#ifndef CONFIG_PPC_ISERIES
269	if (cpu_has_feature(CPU_FTR_SMT))
270	sysdev_create_file(s, &attr_smt_snooze_delay);
271	#endif
272
273	/* PMC stuff */
274
275	sysdev_create_file(s, &attr_mmcr0);
276	sysdev_create_file(s, &attr_mmcr1);
277
278	if (cpu_has_feature(CPU_FTR_MMCRA))
279	sysdev_create_file(s, &attr_mmcra);
280
281	sysdev_create_file(s, &attr_pmc1);
282	sysdev_create_file(s, &attr_pmc2);
283	sysdev_create_file(s, &attr_pmc3);
284	sysdev_create_file(s, &attr_pmc4);
285	sysdev_create_file(s, &attr_pmc5);
286	sysdev_create_file(s, &attr_pmc6);
287
288	if (cpu_has_feature(CPU_FTR_PMC8)) {
289	sysdev_create_file(s, &attr_pmc7);
290	sysdev_create_file(s, &attr_pmc8);
291	}
292
293	if (cpu_has_feature(CPU_FTR_SMT))
294	sysdev_create_file(s, &attr_purr);
295	}
296
297	#ifdef CONFIG_HOTPLUG_CPU
298	static void unregister_cpu_online(unsigned int cpu)
299	{
300	struct cpu *c = &per_cpu(cpu_devices, cpu);
301	struct sys_device *s = &c->sysdev;
302
303	BUG_ON(c->no_control);
304
305	#ifndef CONFIG_PPC_ISERIES
306	if (cpu_has_feature(CPU_FTR_SMT))
307	sysdev_remove_file(s, &attr_smt_snooze_delay);
308	#endif
309
310	/* PMC stuff */
311
312	sysdev_remove_file(s, &attr_mmcr0);
313	sysdev_remove_file(s, &attr_mmcr1);
314
315	if (cpu_has_feature(CPU_FTR_MMCRA))
316	sysdev_remove_file(s, &attr_mmcra);
317
318	sysdev_remove_file(s, &attr_pmc1);
319	sysdev_remove_file(s, &attr_pmc2);
320	sysdev_remove_file(s, &attr_pmc3);
321	sysdev_remove_file(s, &attr_pmc4);
322	sysdev_remove_file(s, &attr_pmc5);
323	sysdev_remove_file(s, &attr_pmc6);
324
325	if (cpu_has_feature(CPU_FTR_PMC8)) {
326	sysdev_remove_file(s, &attr_pmc7);
327	sysdev_remove_file(s, &attr_pmc8);
328	}
329
330	if (cpu_has_feature(CPU_FTR_SMT))
331	sysdev_remove_file(s, &attr_purr);
332	}
333	#endif /* CONFIG_HOTPLUG_CPU */
334
335	static int __devinit sysfs_cpu_notify(struct notifier_block *self,
336	unsigned long action, void *hcpu)
337	{
338	unsigned int cpu = (unsigned int)(long)hcpu;
339
340	switch (action) {
341	case CPU_ONLINE:
342	register_cpu_online(cpu);
343	break;
344	#ifdef CONFIG_HOTPLUG_CPU
345	case CPU_DEAD:
346	unregister_cpu_online(cpu);
347	break;
348	#endif
349	}
350	return NOTIFY_OK;
351	}
352
353	static struct notifier_block __devinitdata sysfs_cpu_nb = {
354	.notifier_call = sysfs_cpu_notify,
355	};
356
357	/* NUMA stuff */
358
359	#ifdef CONFIG_NUMA
360	static struct node node_devices[MAX_NUMNODES];
361
362	static void register_nodes(void)
363	{
364	int i;
365
366	for (i = 0; i < MAX_NUMNODES; i++) {
367	if (node_online(i)) {
368	int p_node = parent_node(i);
369	struct node *parent = NULL;
370
371	if (p_node != i)
372	parent = &node_devices[p_node];
373
374	register_node(&node_devices[i], i, parent);
375	}
376	}
377	}
378	#else
379	static void register_nodes(void)
380	{
381	return;
382	}
383	#endif
384
385	/* Only valid if CPU is present. */
386	static ssize_t show_physical_id(struct sys_device dev, char buf)
387	{
388	struct cpu *cpu = container_of(dev, struct cpu, sysdev);
389
390	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
391	}
392	static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
393
394	static int __init topology_init(void)
395	{
396	int cpu;
397	struct node *parent = NULL;
398
399	register_nodes();
400
401	register_cpu_notifier(&sysfs_cpu_nb);
402
403	for_each_cpu(cpu) {
404	struct cpu *c = &per_cpu(cpu_devices, cpu);
405
406	#ifdef CONFIG_NUMA
407	parent = &node_devices[cpu_to_node(cpu)];
408	#endif
409	/*
410	* For now, we just see if the system supports making
411	* the RTAS calls for CPU hotplug. But, there may be a
412	* more comprehensive way to do this for an individual
413	* CPU. For instance, the boot cpu might never be valid
414	* for hotplugging.
415	*/
416	if (!ppc_md.cpu_die)
417	c->no_control = 1;
418
419	if (cpu_online(cpu) \|\| (c->no_control == 0)) {
420	register_cpu(c, cpu, parent);
421
422	sysdev_create_file(&c->sysdev, &attr_physical_id);
423	}
424
425	if (cpu_online(cpu))
426	register_cpu_online(cpu);
427	}
428
429	return 0;
430	}
431	__initcall(topology_init);