[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>

#ifdef CONFIG_NUMA
static struct node *sysfs_nodes;
#endif
static struct ia64_cpu *sysfs_cpus;

int arch_register_cpu(int num)
{
	struct node *parent = NULL;
	
#ifdef CONFIG_NUMA
	parent = &sysfs_nodes[cpu_to_node(num)];
#endif /* CONFIG_NUMA */

#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, parent);
}

#ifdef CONFIG_HOTPLUG_CPU

void arch_unregister_cpu(int num)
{
	struct node *parent = NULL;

#ifdef CONFIG_NUMA
	int node = cpu_to_node(num);
	parent = &sysfs_nodes[node];
#endif /* CONFIG_NUMA */

	return unregister_cpu(&sysfs_cpus[num].cpu, parent);
}
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
	sysfs_nodes = kzalloc(sizeof(struct node) * MAX_NUMNODES, GFP_KERNEL);
	if (!sysfs_nodes) {
		err = -ENOMEM;
		goto out;
	}

	/*
	 * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
	 */
	for_each_online_node(i) {
		if ((err = register_node(&sysfs_nodes[i], i, 0)))
			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 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
	29	#ifdef CONFIG_NUMA
	30	static struct node *sysfs_nodes;
	31	#endif
	32	static struct ia64_cpu *sysfs_cpus;
	33
	34	int arch_register_cpu(int num)
	35	{
	36	struct node *parent = NULL;
	37
	38	#ifdef CONFIG_NUMA
	39	parent = &sysfs_nodes[cpu_to_node(num)];
	40	#endif /* CONFIG_NUMA */
	41
b88e9265	42	#if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
55e59c51 AR	43	/*
	44	* If CPEI cannot be re-targetted, and this is
	45	* CPEI target, then dont create the control file
	46	*/
	47	if (!can_cpei_retarget() && is_cpu_cpei_target(num))
	48	sysfs_cpus[num].cpu.no_control = 1;
46906c44	49	#endif
55e59c51	50
1da177e4 LT	51	return register_cpu(&sysfs_cpus[num].cpu, num, parent);
	52	}
	53
	54	#ifdef CONFIG_HOTPLUG_CPU
	55
	56	void arch_unregister_cpu(int num)
	57	{
	58	struct node *parent = NULL;
	59
	60	#ifdef CONFIG_NUMA
	61	int node = cpu_to_node(num);
	62	parent = &sysfs_nodes[node];
	63	#endif /* CONFIG_NUMA */
	64
	65	return unregister_cpu(&sysfs_cpus[num].cpu, parent);
	66	}
	67	EXPORT_SYMBOL(arch_register_cpu);
	68	EXPORT_SYMBOL(arch_unregister_cpu);
	69	#endif /CONFIG_HOTPLUG_CPU/
	70
	71
	72	static int __init topology_init(void)
	73	{
	74	int i, err = 0;
	75
	76	#ifdef CONFIG_NUMA
69dcc991	77	sysfs_nodes = kzalloc(sizeof(struct node) * MAX_NUMNODES, GFP_KERNEL);
1da177e4 LT	78	if (!sysfs_nodes) {
	79	err = -ENOMEM;
	80	goto out;
	81	}
1da177e4	82
69dcc991 ZY	83	/*
	84	* MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
	85	*/
	86	for_each_online_node(i) {
1da177e4 LT	87	if ((err = register_node(&sysfs_nodes[i], i, 0)))
1da177e4 LT	88	goto out;
69dcc991	89	}
1da177e4 LT	90	#endif
1da177e4 LT	91
69dcc991	92	sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
1da177e4 LT	93	if (!sysfs_cpus) {
	94	err = -ENOMEM;
	95	goto out;
	96	}
1da177e4	97
69dcc991	98	for_each_present_cpu(i) {
1da177e4 LT	99	if((err = arch_register_cpu(i)))
1da177e4 LT	100	goto out;
69dcc991	101	}
1da177e4 LT	102	out:
	103	return err;
	104	}
	105
69dcc991	106	subsys_initcall(topology_init);
f1918005 ZY	107
	108
	109	/*
	110	* Export cpu cache information through sysfs
	111	*/
	112
	113	/*
	114	* A bunch of string array to get pretty printing
	115	*/
	116	static const char *cache_types[] = {
	117	"", /* not used */
	118	"Instruction",
	119	"Data",
	120	"Unified" /* unified */
	121	};
	122
	123	static const char *cache_mattrib[]={
	124	"WriteThrough",
	125	"WriteBack",
	126	"", /* reserved */
	127	"" /* reserved */
	128	};
	129
	130	struct cache_info {
	131	pal_cache_config_info_t cci;
	132	cpumask_t shared_cpu_map;
	133	int level;
	134	int type;
	135	struct kobject kobj;
	136	};
	137
	138	struct cpu_cache_info {
	139	struct cache_info *cache_leaves;
	140	int num_cache_leaves;
	141	struct kobject kobj;
	142	};
	143
	144	static struct cpu_cache_info all_cpu_cache_info[NR_CPUS];
	145	#define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y])
	146
	147	#ifdef CONFIG_SMP
	148	static void cache_shared_cpu_map_setup( unsigned int cpu,
	149	struct cache_info * this_leaf)
	150	{
	151	pal_cache_shared_info_t csi;
	152	int num_shared, i = 0;
	153	unsigned int j;
	154
	155	if (cpu_data(cpu)->threads_per_core <= 1 &&
	156	cpu_data(cpu)->cores_per_socket <= 1) {
	157	cpu_set(cpu, this_leaf->shared_cpu_map);
	158	return;
	159	}
	160
	161	if (ia64_pal_cache_shared_info(this_leaf->level,
	162	this_leaf->type,
	163	0,
	164	&csi) != PAL_STATUS_SUCCESS)
	165	return;
	166
	167	num_shared = (int) csi.num_shared;
	168	do {
fb1bb34d	169	for_each_possible_cpu(j)
f1918005 ZY	170	if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
	171	&& cpu_data(j)->core_id == csi.log1_cid
	172	&& cpu_data(j)->thread_id == csi.log1_tid)
	173	cpu_set(j, this_leaf->shared_cpu_map);
	174
	175	i++;
	176	} while (i < num_shared &&
	177	ia64_pal_cache_shared_info(this_leaf->level,
	178	this_leaf->type,
	179	i,
	180	&csi) == PAL_STATUS_SUCCESS);
	181	}
	182	#else
	183	static void cache_shared_cpu_map_setup(unsigned int cpu,
	184	struct cache_info * this_leaf)
	185	{
	186	cpu_set(cpu, this_leaf->shared_cpu_map);
	187	return;
	188	}
	189	#endif
	190
	191	static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
	192	char *buf)
	193	{
	194	return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
	195	}
	196
	197	static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
	198	char *buf)
	199	{
	200	return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
	201	}
	202
	203	static ssize_t show_attributes(struct cache_info this_leaf, char buf)
	204	{
	205	return sprintf(buf,
	206	"%s\n",
	207	cache_mattrib[this_leaf->cci.pcci_cache_attr]);
	208	}
	209
	210	static ssize_t show_size(struct cache_info this_leaf, char buf)
	211	{
	212	return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
	213	}
	214
	215	static ssize_t show_number_of_sets(struct cache_info this_leaf, char buf)
	216	{
	217	unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
	218	number_of_sets /= this_leaf->cci.pcci_assoc;
	219	number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
	220
	221	return sprintf(buf, "%u\n", number_of_sets);
	222	}
	223
	224	static ssize_t show_shared_cpu_map(struct cache_info this_leaf, char buf)
	225	{
	226	ssize_t len;
	227	cpumask_t shared_cpu_map;
	228
	229	cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
	230	len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
	231	len += sprintf(buf+len, "\n");
	232	return len;
	233	}
234
235	static ssize_t show_type(struct cache_info this_leaf, char buf)
236	{
237	int type = this_leaf->type + this_leaf->cci.pcci_unified;
238	return sprintf(buf, "%s\n", cache_types[type]);
239	}
240
241	static ssize_t show_level(struct cache_info this_leaf, char buf)
242	{
243	return sprintf(buf, "%u\n", this_leaf->level);
244	}
245
246	struct cache_attr {
247	struct attribute attr;
248	ssize_t (show)(struct cache_info , char *);
249	ssize_t (store)(struct cache_info , const char *, size_t count);
250	};
251
252	#ifdef define_one_ro
253	#undef define_one_ro
254	#endif
255	#define define_one_ro(_name) \
256	static struct cache_attr _name = \
257	__ATTR(_name, 0444, show_##_name, NULL)
258
259	define_one_ro(level);
260	define_one_ro(type);
261	define_one_ro(coherency_line_size);
262	define_one_ro(ways_of_associativity);
263	define_one_ro(size);
264	define_one_ro(number_of_sets);
265	define_one_ro(shared_cpu_map);
266	define_one_ro(attributes);
267
268	static struct attribute * cache_default_attrs[] = {
269	&type.attr,
270	&level.attr,
271	&coherency_line_size.attr,
272	&ways_of_associativity.attr,
273	&attributes.attr,
274	&size.attr,
275	&number_of_sets.attr,
276	&shared_cpu_map.attr,
277	NULL
278	};
279
280	#define to_object(k) container_of(k, struct cache_info, kobj)
281	#define to_attr(a) container_of(a, struct cache_attr, attr)
282
283	static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
284	{
285	struct cache_attr *fattr = to_attr(attr);
286	struct cache_info *this_leaf = to_object(kobj);
287	ssize_t ret;
288
289	ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
290	return ret;
291	}
292
293	static struct sysfs_ops cache_sysfs_ops = {
294	.show = cache_show
295	};
296
297	static struct kobj_type cache_ktype = {
298	.sysfs_ops = &cache_sysfs_ops,
299	.default_attrs = cache_default_attrs,
300	};
301
302	static struct kobj_type cache_ktype_percpu_entry = {
303	.sysfs_ops = &cache_sysfs_ops,
304	};
305
306	static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
307	{
cbf283c0 JJ	308	kfree(all_cpu_cache_info[cpu].cache_leaves);
cbf283c0 JJ	309	all_cpu_cache_info[cpu].cache_leaves = NULL;
f1918005 ZY	310	all_cpu_cache_info[cpu].num_cache_leaves = 0;
f1918005 ZY	311	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
f1918005 ZY	312	return;
	313	}
	314
	315	static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
	316	{
	317	u64 i, levels, unique_caches;
	318	pal_cache_config_info_t cci;
	319	int j;
	320	s64 status;
	321	struct cache_info *this_cache;
	322	int num_cache_leaves = 0;
	323
	324	if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
	325	printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
	326	return -1;
	327	}
	328
	329	this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
	330	GFP_KERNEL);
	331	if (this_cache == NULL)
	332	return -ENOMEM;
	333
	334	for (i=0; i < levels; i++) {
	335	for (j=2; j >0 ; j--) {
	336	if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
	337	PAL_STATUS_SUCCESS)
	338	continue;
	339
	340	this_cache[num_cache_leaves].cci = cci;
	341	this_cache[num_cache_leaves].level = i + 1;
	342	this_cache[num_cache_leaves].type = j;
	343
	344	cache_shared_cpu_map_setup(cpu,
	345	&this_cache[num_cache_leaves]);
	346	num_cache_leaves ++;
	347	}
	348	}
	349
	350	all_cpu_cache_info[cpu].cache_leaves = this_cache;
	351	all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
	352
	353	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
	354
	355	return 0;
	356	}
	357
	358	/* Add cache interface for CPU device */
	359	static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
	360	{
	361	unsigned int cpu = sys_dev->id;
	362	unsigned long i, j;
	363	struct cache_info *this_object;
	364	int retval = 0;
	365	cpumask_t oldmask;
	366
	367	if (all_cpu_cache_info[cpu].kobj.parent)
	368	return 0;
	369
	370	oldmask = current->cpus_allowed;
	371	retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
	372	if (unlikely(retval))
	373	return retval;
	374
	375	retval = cpu_cache_sysfs_init(cpu);
376	set_cpus_allowed(current, oldmask);
377	if (unlikely(retval < 0))
378	return retval;
379
380	all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj;
381	kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache");
382	all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry;
383	retval = kobject_register(&all_cpu_cache_info[cpu].kobj);
384
385	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
386	this_object = LEAF_KOBJECT_PTR(cpu,i);
387	this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj;
388	kobject_set_name(&(this_object->kobj), "index%1lu", i);
389	this_object->kobj.ktype = &cache_ktype;
390	retval = kobject_register(&(this_object->kobj));
391	if (unlikely(retval)) {
392	for (j = 0; j < i; j++) {
393	kobject_unregister(
394	&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
395	}
396	kobject_unregister(&all_cpu_cache_info[cpu].kobj);
397	cpu_cache_sysfs_exit(cpu);
398	break;
399	}
400	}
401	return retval;
402	}
403
404	/* Remove cache interface for CPU device */
405	static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
406	{
407	unsigned int cpu = sys_dev->id;
408	unsigned long i;
409
410	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
411	kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
412
413	if (all_cpu_cache_info[cpu].kobj.parent) {
414	kobject_unregister(&all_cpu_cache_info[cpu].kobj);
415	memset(&all_cpu_cache_info[cpu].kobj,
416	0,
417	sizeof(struct kobject));
418	}
419
420	cpu_cache_sysfs_exit(cpu);
421
422	return 0;
423	}
424
425	/*
426	* When a cpu is hot-plugged, do a check and initiate
427	* cache kobject if necessary
428	*/
83d722f7	429	static int cache_cpu_callback(struct notifier_block *nfb,
f1918005 ZY	430	unsigned long action, void *hcpu)
	431	{
	432	unsigned int cpu = (unsigned long)hcpu;
	433	struct sys_device *sys_dev;
	434
	435	sys_dev = get_cpu_sysdev(cpu);
	436	switch (action) {
	437	case CPU_ONLINE:
	438	cache_add_dev(sys_dev);
	439	break;
	440	case CPU_DEAD:
	441	cache_remove_dev(sys_dev);
	442	break;
	443	}
	444	return NOTIFY_OK;
	445	}
	446
	447	static struct notifier_block cache_cpu_notifier =
	448	{
	449	.notifier_call = cache_cpu_callback
	450	};
	451
	452	static int __cpuinit cache_sysfs_init(void)
	453	{
	454	int i;
	455
	456	for_each_online_cpu(i) {
	457	cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE,
	458	(void *)(long)i);
	459	}
	460
	461	register_cpu_notifier(&cache_cpu_notifier);
	462
	463	return 0;
	464	}
	465
	466	device_initcall(cache_sysfs_init);
	467