[deliverable/linux.git] / arch / ia64 / kernel / topology.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * This file contains NUMA specific variables and functions which can
 * be split away from DISCONTIGMEM and are used on NUMA machines with
 * contiguous memory.
 * 		2002/08/07 Erich Focht <efocht@ess.nec.de>
 * Populate cpu entries in sysfs for non-numa systems as well
 *  	Intel Corporation - Ashok Raj
 * 02/27/2006 Zhang, Yanmin
 *	Populate cpu cache entries in sysfs for cpu cache info
 */

#include <linux/config.h>
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/node.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/nodemask.h>
#include <linux/notifier.h>
#include <asm/mmzone.h>
#include <asm/numa.h>
#include <asm/cpu.h>

static struct ia64_cpu *sysfs_cpus;

int arch_register_cpu(int num)
{
#if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
	/*
	 * If CPEI cannot be re-targetted, and this is
	 * CPEI target, then dont create the control file
	 */
	if (!can_cpei_retarget() && is_cpu_cpei_target(num))
		sysfs_cpus[num].cpu.no_control = 1;
#endif

	return register_cpu(&sysfs_cpus[num].cpu, num);
}

#ifdef CONFIG_HOTPLUG_CPU

void arch_unregister_cpu(int num)
{
	return unregister_cpu(&sysfs_cpus[num].cpu);
}
EXPORT_SYMBOL(arch_register_cpu);
EXPORT_SYMBOL(arch_unregister_cpu);
#endif /*CONFIG_HOTPLUG_CPU*/


static int __init topology_init(void)
{
	int i, err = 0;

#ifdef CONFIG_NUMA
	/*
	 * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
	 */
	for_each_online_node(i) {
		if ((err = register_one_node(i)))
			goto out;
	}
#endif

	sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
	if (!sysfs_cpus) {
		err = -ENOMEM;
		goto out;
	}

	for_each_present_cpu(i) {
		if((err = arch_register_cpu(i)))
			goto out;
	}
out:
	return err;
}

subsys_initcall(topology_init);


/*
 * Export cpu cache information through sysfs
 */

/*
 *  A bunch of string array to get pretty printing
 */
static const char *cache_types[] = {
	"",			/* not used */
	"Instruction",
	"Data",
	"Unified"	/* unified */
};

static const char *cache_mattrib[]={
	"WriteThrough",
	"WriteBack",
	"",		/* reserved */
	""		/* reserved */
};

struct cache_info {
	pal_cache_config_info_t	cci;
	cpumask_t shared_cpu_map;
	int level;
	int type;
	struct kobject kobj;
};

struct cpu_cache_info {
	struct cache_info *cache_leaves;
	int	num_cache_leaves;
	struct kobject kobj;
};

static struct cpu_cache_info	all_cpu_cache_info[NR_CPUS];
#define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])

#ifdef CONFIG_SMP
static void cache_shared_cpu_map_setup( unsigned int cpu,
		struct cache_info * this_leaf)
{
	pal_cache_shared_info_t	csi;
	int num_shared, i = 0;
	unsigned int j;

	if (cpu_data(cpu)->threads_per_core <= 1 &&
		cpu_data(cpu)->cores_per_socket <= 1) {
		cpu_set(cpu, this_leaf->shared_cpu_map);
		return;
	}

	if (ia64_pal_cache_shared_info(this_leaf->level,
					this_leaf->type,
					0,
					&csi) != PAL_STATUS_SUCCESS)
		return;

	num_shared = (int) csi.num_shared;
	do {
		for_each_possible_cpu(j)
			if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
				&& cpu_data(j)->core_id == csi.log1_cid
				&& cpu_data(j)->thread_id == csi.log1_tid)
				cpu_set(j, this_leaf->shared_cpu_map);

		i++;
	} while (i < num_shared &&
		ia64_pal_cache_shared_info(this_leaf->level,
				this_leaf->type,
				i,
				&csi) == PAL_STATUS_SUCCESS);
}
#else
static void cache_shared_cpu_map_setup(unsigned int cpu,
		struct cache_info * this_leaf)
{
	cpu_set(cpu, this_leaf->shared_cpu_map);
	return;
}
#endif

static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
					char *buf)
{
	return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
}

static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
					char *buf)
{
	return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
}

static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
{
	return sprintf(buf,
			"%s\n",
			cache_mattrib[this_leaf->cci.pcci_cache_attr]);
}

static ssize_t show_size(struct cache_info *this_leaf, char *buf)
{
	return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
}

static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
{
	unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
	number_of_sets /= this_leaf->cci.pcci_assoc;
	number_of_sets /= 1 << this_leaf->cci.pcci_line_size;

	return sprintf(buf, "%u\n", number_of_sets);
}

static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
{
	ssize_t	len;
	cpumask_t shared_cpu_map;

	cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
	len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
	len += sprintf(buf+len, "\n");
	return len;
}

static ssize_t show_type(struct cache_info *this_leaf, char *buf)
{
	int type = this_leaf->type + this_leaf->cci.pcci_unified;
	return sprintf(buf, "%s\n", cache_types[type]);
}

static ssize_t show_level(struct cache_info *this_leaf, char *buf)
{
	return sprintf(buf, "%u\n", this_leaf->level);
}

struct cache_attr {
	struct attribute attr;
	ssize_t (*show)(struct cache_info *, char *);
	ssize_t (*store)(struct cache_info *, const char *, size_t count);
};

#ifdef define_one_ro
	#undef define_one_ro
#endif
#define define_one_ro(_name) \
	static struct cache_attr _name = \
__ATTR(_name, 0444, show_##_name, NULL)

define_one_ro(level);
define_one_ro(type);
define_one_ro(coherency_line_size);
define_one_ro(ways_of_associativity);
define_one_ro(size);
define_one_ro(number_of_sets);
define_one_ro(shared_cpu_map);
define_one_ro(attributes);

static struct attribute * cache_default_attrs[] = {
	&type.attr,
	&level.attr,
	&coherency_line_size.attr,
	&ways_of_associativity.attr,
	&attributes.attr,
	&size.attr,
	&number_of_sets.attr,
	&shared_cpu_map.attr,
	NULL
};

#define to_object(k) container_of(k, struct cache_info, kobj)
#define to_attr(a) container_of(a, struct cache_attr, attr)

static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
{
	struct cache_attr *fattr = to_attr(attr);
	struct cache_info *this_leaf = to_object(kobj);
	ssize_t ret;

	ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
	return ret;
}

static struct sysfs_ops cache_sysfs_ops = {
	.show   = cache_show
};

static struct kobj_type cache_ktype = {
	.sysfs_ops	= &cache_sysfs_ops,
	.default_attrs	= cache_default_attrs,
};

static struct kobj_type cache_ktype_percpu_entry = {
	.sysfs_ops	= &cache_sysfs_ops,
};

static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
{
	kfree(all_cpu_cache_info[cpu].cache_leaves);
	all_cpu_cache_info[cpu].cache_leaves = NULL;
	all_cpu_cache_info[cpu].num_cache_leaves = 0;
	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
	return;
}

static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
{
	u64 i, levels, unique_caches;
	pal_cache_config_info_t cci;
	int j;
	s64 status;
	struct cache_info *this_cache;
	int num_cache_leaves = 0;

	if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
		printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
		return -1;
	}

	this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
			GFP_KERNEL);
	if (this_cache == NULL)
		return -ENOMEM;

	for (i=0; i < levels; i++) {
		for (j=2; j >0 ; j--) {
			if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
					PAL_STATUS_SUCCESS)
				continue;

			this_cache[num_cache_leaves].cci = cci;
			this_cache[num_cache_leaves].level = i + 1;
			this_cache[num_cache_leaves].type = j;

			cache_shared_cpu_map_setup(cpu,
					&this_cache[num_cache_leaves]);
			num_cache_leaves ++;
		}
	}

	all_cpu_cache_info[cpu].cache_leaves = this_cache;
	all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;

	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));

	return 0;
}

/* Add cache interface for CPU device */
static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
{
	unsigned int cpu = sys_dev->id;
	unsigned long i, j;
	struct cache_info *this_object;
	int retval = 0;
	cpumask_t oldmask;

	if (all_cpu_cache_info[cpu].kobj.parent)
		return 0;

	oldmask = current->cpus_allowed;
	retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
	if (unlikely(retval))
		return retval;

	retval = cpu_cache_sysfs_init(cpu);
	set_cpus_allowed(current, oldmask);
	if (unlikely(retval < 0))
		return retval;

	all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj;
	kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache");
	all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry;
	retval = kobject_register(&all_cpu_cache_info[cpu].kobj);

	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
		this_object = LEAF_KOBJECT_PTR(cpu,i);
		this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj;
		kobject_set_name(&(this_object->kobj), "index%1lu", i);
		this_object->kobj.ktype = &cache_ktype;
		retval = kobject_register(&(this_object->kobj));
		if (unlikely(retval)) {
			for (j = 0; j < i; j++) {
				kobject_unregister(
					&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
			}
			kobject_unregister(&all_cpu_cache_info[cpu].kobj);
			cpu_cache_sysfs_exit(cpu);
			break;
		}
	}
	return retval;
}

/* Remove cache interface for CPU device */
static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
{
	unsigned int cpu = sys_dev->id;
	unsigned long i;

	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
		kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));

	if (all_cpu_cache_info[cpu].kobj.parent) {
		kobject_unregister(&all_cpu_cache_info[cpu].kobj);
		memset(&all_cpu_cache_info[cpu].kobj,
			0,
			sizeof(struct kobject));
	}

	cpu_cache_sysfs_exit(cpu);

	return 0;
}

/*
 * When a cpu is hot-plugged, do a check and initiate
 * cache kobject if necessary
 */
static int __cpuinit cache_cpu_callback(struct notifier_block *nfb,
		unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;
	struct sys_device *sys_dev;

	sys_dev = get_cpu_sysdev(cpu);
	switch (action) {
	case CPU_ONLINE:
		cache_add_dev(sys_dev);
		break;
	case CPU_DEAD:
		cache_remove_dev(sys_dev);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block cache_cpu_notifier =
{
	.notifier_call = cache_cpu_callback
};

static int __cpuinit cache_sysfs_init(void)
{
	int i;

	for_each_online_cpu(i) {
		cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE,
				(void *)(long)i);
	}

	register_cpu_notifier(&cache_cpu_notifier);

	return 0;
}

device_initcall(cache_sysfs_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* This file contains NUMA specific variables and functions which can
	7	* be split away from DISCONTIGMEM and are used on NUMA machines with
	8	* contiguous memory.
	9	* 2002/08/07 Erich Focht <efocht@ess.nec.de>
	10	* Populate cpu entries in sysfs for non-numa systems as well
	11	* Intel Corporation - Ashok Raj
f1918005 ZY	12	* 02/27/2006 Zhang, Yanmin
f1918005 ZY	13	* Populate cpu cache entries in sysfs for cpu cache info
1da177e4 LT	14	*/
	15
	16	#include <linux/config.h>
	17	#include <linux/cpu.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
	20	#include <linux/node.h>
	21	#include <linux/init.h>
	22	#include <linux/bootmem.h>
	23	#include <linux/nodemask.h>
f1918005	24	#include <linux/notifier.h>
1da177e4 LT	25	#include <asm/mmzone.h>
	26	#include <asm/numa.h>
	27	#include <asm/cpu.h>
	28
1da177e4 LT	29	static struct ia64_cpu *sysfs_cpus;
	30
	31	int arch_register_cpu(int num)
	32	{
b88e9265	33	#if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
55e59c51 AR	34	/*
	35	* If CPEI cannot be re-targetted, and this is
	36	* CPEI target, then dont create the control file
	37	*/
	38	if (!can_cpei_retarget() && is_cpu_cpei_target(num))
	39	sysfs_cpus[num].cpu.no_control = 1;
46906c44	40	#endif
55e59c51	41
76b67ed9	42	return register_cpu(&sysfs_cpus[num].cpu, num);
1da177e4 LT	43	}
	44
	45	#ifdef CONFIG_HOTPLUG_CPU
	46
	47	void arch_unregister_cpu(int num)
	48	{
76b67ed9	49	return unregister_cpu(&sysfs_cpus[num].cpu);
1da177e4 LT	50	}
	51	EXPORT_SYMBOL(arch_register_cpu);
	52	EXPORT_SYMBOL(arch_unregister_cpu);
	53	#endif /CONFIG_HOTPLUG_CPU/
	54
	55
	56	static int __init topology_init(void)
	57	{
	58	int i, err = 0;
	59
	60	#ifdef CONFIG_NUMA
69dcc991 ZY	61	/*
	62	* MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
	63	*/
	64	for_each_online_node(i) {
0fc44159	65	if ((err = register_one_node(i)))
1da177e4	66	goto out;
69dcc991	67	}
1da177e4 LT	68	#endif
1da177e4 LT	69
69dcc991	70	sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
1da177e4 LT	71	if (!sysfs_cpus) {
	72	err = -ENOMEM;
	73	goto out;
	74	}
1da177e4	75
69dcc991	76	for_each_present_cpu(i) {
1da177e4 LT	77	if((err = arch_register_cpu(i)))
1da177e4 LT	78	goto out;
69dcc991	79	}
1da177e4 LT	80	out:
	81	return err;
	82	}
	83
69dcc991	84	subsys_initcall(topology_init);
f1918005 ZY	85
	86
	87	/*
	88	* Export cpu cache information through sysfs
	89	*/
	90
	91	/*
	92	* A bunch of string array to get pretty printing
	93	*/
	94	static const char *cache_types[] = {
	95	"", /* not used */
	96	"Instruction",
	97	"Data",
	98	"Unified" /* unified */
	99	};
	100
	101	static const char *cache_mattrib[]={
	102	"WriteThrough",
	103	"WriteBack",
	104	"", /* reserved */
	105	"" /* reserved */
	106	};
	107
	108	struct cache_info {
	109	pal_cache_config_info_t cci;
	110	cpumask_t shared_cpu_map;
	111	int level;
	112	int type;
	113	struct kobject kobj;
	114	};
	115
	116	struct cpu_cache_info {
	117	struct cache_info *cache_leaves;
	118	int num_cache_leaves;
	119	struct kobject kobj;
	120	};
	121
	122	static struct cpu_cache_info all_cpu_cache_info[NR_CPUS];
	123	#define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y])
	124
	125	#ifdef CONFIG_SMP
	126	static void cache_shared_cpu_map_setup( unsigned int cpu,
	127	struct cache_info * this_leaf)
	128	{
	129	pal_cache_shared_info_t csi;
	130	int num_shared, i = 0;
	131	unsigned int j;
	132
	133	if (cpu_data(cpu)->threads_per_core <= 1 &&
	134	cpu_data(cpu)->cores_per_socket <= 1) {
	135	cpu_set(cpu, this_leaf->shared_cpu_map);
	136	return;
	137	}
	138
	139	if (ia64_pal_cache_shared_info(this_leaf->level,
	140	this_leaf->type,
	141	0,
	142	&csi) != PAL_STATUS_SUCCESS)
	143	return;
	144
	145	num_shared = (int) csi.num_shared;
	146	do {
fb1bb34d	147	for_each_possible_cpu(j)
f1918005 ZY	148	if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
	149	&& cpu_data(j)->core_id == csi.log1_cid
	150	&& cpu_data(j)->thread_id == csi.log1_tid)
	151	cpu_set(j, this_leaf->shared_cpu_map);
	152
	153	i++;
	154	} while (i < num_shared &&
	155	ia64_pal_cache_shared_info(this_leaf->level,
	156	this_leaf->type,
	157	i,
	158	&csi) == PAL_STATUS_SUCCESS);
	159	}
	160	#else
	161	static void cache_shared_cpu_map_setup(unsigned int cpu,
	162	struct cache_info * this_leaf)
	163	{
	164	cpu_set(cpu, this_leaf->shared_cpu_map);
	165	return;
	166	}
	167	#endif
	168
	169	static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
	170	char *buf)
	171	{
	172	return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
	173	}
	174
	175	static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
	176	char *buf)
	177	{
	178	return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
	179	}
	180
	181	static ssize_t show_attributes(struct cache_info this_leaf, char buf)
	182	{
	183	return sprintf(buf,
	184	"%s\n",
	185	cache_mattrib[this_leaf->cci.pcci_cache_attr]);
	186	}
	187
	188	static ssize_t show_size(struct cache_info this_leaf, char buf)
	189	{
	190	return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
	191	}
	192
	193	static ssize_t show_number_of_sets(struct cache_info this_leaf, char buf)
	194	{
	195	unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
	196	number_of_sets /= this_leaf->cci.pcci_assoc;
	197	number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
	198
	199	return sprintf(buf, "%u\n", number_of_sets);
	200	}
	201
	202	static ssize_t show_shared_cpu_map(struct cache_info this_leaf, char buf)
	203	{
	204	ssize_t len;
	205	cpumask_t shared_cpu_map;
	206
	207	cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
	208	len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
	209	len += sprintf(buf+len, "\n");
	210	return len;
	211	}
212
213	static ssize_t show_type(struct cache_info this_leaf, char buf)
214	{
215	int type = this_leaf->type + this_leaf->cci.pcci_unified;
216	return sprintf(buf, "%s\n", cache_types[type]);
217	}
218
219	static ssize_t show_level(struct cache_info this_leaf, char buf)
220	{
221	return sprintf(buf, "%u\n", this_leaf->level);
222	}
223
224	struct cache_attr {
225	struct attribute attr;
226	ssize_t (show)(struct cache_info , char *);
227	ssize_t (store)(struct cache_info , const char *, size_t count);
228	};
229
230	#ifdef define_one_ro
231	#undef define_one_ro
232	#endif
233	#define define_one_ro(_name) \
234	static struct cache_attr _name = \
235	__ATTR(_name, 0444, show_##_name, NULL)
236
237	define_one_ro(level);
238	define_one_ro(type);
239	define_one_ro(coherency_line_size);
240	define_one_ro(ways_of_associativity);
241	define_one_ro(size);
242	define_one_ro(number_of_sets);
243	define_one_ro(shared_cpu_map);
244	define_one_ro(attributes);
245
246	static struct attribute * cache_default_attrs[] = {
247	&type.attr,
248	&level.attr,
249	&coherency_line_size.attr,
250	&ways_of_associativity.attr,
251	&attributes.attr,
252	&size.attr,
253	&number_of_sets.attr,
254	&shared_cpu_map.attr,
255	NULL
256	};
257
258	#define to_object(k) container_of(k, struct cache_info, kobj)
259	#define to_attr(a) container_of(a, struct cache_attr, attr)
260
261	static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
262	{
263	struct cache_attr *fattr = to_attr(attr);
264	struct cache_info *this_leaf = to_object(kobj);
265	ssize_t ret;
266
267	ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
268	return ret;
269	}
270
271	static struct sysfs_ops cache_sysfs_ops = {
272	.show = cache_show
273	};
274
275	static struct kobj_type cache_ktype = {
276	.sysfs_ops = &cache_sysfs_ops,
277	.default_attrs = cache_default_attrs,
278	};
279
280	static struct kobj_type cache_ktype_percpu_entry = {
281	.sysfs_ops = &cache_sysfs_ops,
282	};
283
284	static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
285	{
cbf283c0 JJ	286	kfree(all_cpu_cache_info[cpu].cache_leaves);
cbf283c0 JJ	287	all_cpu_cache_info[cpu].cache_leaves = NULL;
f1918005 ZY	288	all_cpu_cache_info[cpu].num_cache_leaves = 0;
f1918005 ZY	289	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
f1918005 ZY	290	return;
	291	}
	292
	293	static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
	294	{
	295	u64 i, levels, unique_caches;
	296	pal_cache_config_info_t cci;
	297	int j;
	298	s64 status;
	299	struct cache_info *this_cache;
	300	int num_cache_leaves = 0;
	301
	302	if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
	303	printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
	304	return -1;
	305	}
	306
	307	this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
	308	GFP_KERNEL);
	309	if (this_cache == NULL)
	310	return -ENOMEM;
	311
	312	for (i=0; i < levels; i++) {
	313	for (j=2; j >0 ; j--) {
	314	if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
	315	PAL_STATUS_SUCCESS)
	316	continue;
	317
	318	this_cache[num_cache_leaves].cci = cci;
	319	this_cache[num_cache_leaves].level = i + 1;
	320	this_cache[num_cache_leaves].type = j;
	321
	322	cache_shared_cpu_map_setup(cpu,
	323	&this_cache[num_cache_leaves]);
	324	num_cache_leaves ++;
	325	}
	326	}
	327
	328	all_cpu_cache_info[cpu].cache_leaves = this_cache;
	329	all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
	330
	331	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
	332
	333	return 0;
	334	}
	335
	336	/* Add cache interface for CPU device */
	337	static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
	338	{
	339	unsigned int cpu = sys_dev->id;
	340	unsigned long i, j;
	341	struct cache_info *this_object;
	342	int retval = 0;
	343	cpumask_t oldmask;
	344
	345	if (all_cpu_cache_info[cpu].kobj.parent)
	346	return 0;
	347
	348	oldmask = current->cpus_allowed;
	349	retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
	350	if (unlikely(retval))
	351	return retval;
	352
	353	retval = cpu_cache_sysfs_init(cpu);
354	set_cpus_allowed(current, oldmask);
355	if (unlikely(retval < 0))
356	return retval;
357
358	all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj;
359	kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache");
360	all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry;
361	retval = kobject_register(&all_cpu_cache_info[cpu].kobj);
362
363	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
364	this_object = LEAF_KOBJECT_PTR(cpu,i);
365	this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj;
366	kobject_set_name(&(this_object->kobj), "index%1lu", i);
367	this_object->kobj.ktype = &cache_ktype;
368	retval = kobject_register(&(this_object->kobj));
369	if (unlikely(retval)) {
370	for (j = 0; j < i; j++) {
371	kobject_unregister(
372	&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
373	}
374	kobject_unregister(&all_cpu_cache_info[cpu].kobj);
375	cpu_cache_sysfs_exit(cpu);
376	break;
377	}
378	}
379	return retval;
380	}
381
382	/* Remove cache interface for CPU device */
383	static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
384	{
385	unsigned int cpu = sys_dev->id;
386	unsigned long i;
387
388	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
389	kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
390
391	if (all_cpu_cache_info[cpu].kobj.parent) {
392	kobject_unregister(&all_cpu_cache_info[cpu].kobj);
393	memset(&all_cpu_cache_info[cpu].kobj,
394	0,
395	sizeof(struct kobject));
396	}
397
398	cpu_cache_sysfs_exit(cpu);
399
400	return 0;
401	}
402
403	/*
404	* When a cpu is hot-plugged, do a check and initiate
405	* cache kobject if necessary
406	*/
9c7b216d	407	static int __cpuinit cache_cpu_callback(struct notifier_block *nfb,
f1918005 ZY	408	unsigned long action, void *hcpu)
	409	{
	410	unsigned int cpu = (unsigned long)hcpu;
	411	struct sys_device *sys_dev;
	412
	413	sys_dev = get_cpu_sysdev(cpu);
	414	switch (action) {
	415	case CPU_ONLINE:
	416	cache_add_dev(sys_dev);
	417	break;
	418	case CPU_DEAD:
	419	cache_remove_dev(sys_dev);
	420	break;
	421	}
	422	return NOTIFY_OK;
	423	}
	424
	425	static struct notifier_block cache_cpu_notifier =
	426	{
	427	.notifier_call = cache_cpu_callback
	428	};
	429
	430	static int __cpuinit cache_sysfs_init(void)
	431	{
	432	int i;
	433
	434	for_each_online_cpu(i) {
	435	cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE,
	436	(void *)(long)i);
	437	}
	438
	439	register_cpu_notifier(&cache_cpu_notifier);
	440
	441	return 0;
	442	}
	443
	444	device_initcall(cache_sysfs_init);
	445