[mirror_ubuntu-zesty-kernel.git] / drivers / base / topology.c

/*
 * driver/base/topology.c - Populate sysfs with cpu topology information
 *
 * Written by: Zhang Yanmin, Intel Corporation
 *
 * Copyright (C) 2006, Intel Corp.
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/sysdev.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/topology.h>

#define define_one_ro(_name) 		\
static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)

#define define_id_show_func(name)				\
static ssize_t show_##name(struct sys_device *dev, char *buf)	\
{								\
	unsigned int cpu = dev->id;				\
	return sprintf(buf, "%d\n", topology_##name(cpu));	\
}

static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf)
{
	ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
	int n = 0;

	if (len > 1) {
		n = type?
			cpulist_scnprintf(buf, len-2, *mask):
			cpumask_scnprintf(buf, len-2, *mask);
		buf[n++] = '\n';
		buf[n] = '\0';
	}
	return n;
}

#define define_siblings_show_map(name)					\
static inline ssize_t show_##name(struct sys_device *dev, char *buf)	\
{									\
	unsigned int cpu = dev->id;					\
	return show_cpumap(0, &(topology_##name(cpu)), buf);		\
}

#define define_siblings_show_list(name)					\
static inline ssize_t show_##name##_list(struct sys_device *dev, char *buf) \
{									\
	unsigned int cpu = dev->id;					\
	return show_cpumap(1, &(topology_##name(cpu)), buf);		\
}

#define define_siblings_show_func(name)		\
	define_siblings_show_map(name); define_siblings_show_list(name)

#ifdef	topology_physical_package_id
define_id_show_func(physical_package_id);
define_one_ro(physical_package_id);
#define ref_physical_package_id_attr	&attr_physical_package_id.attr,
#else
#define ref_physical_package_id_attr
#endif

#ifdef topology_core_id
define_id_show_func(core_id);
define_one_ro(core_id);
#define ref_core_id_attr		&attr_core_id.attr,
#else
#define ref_core_id_attr
#endif

#ifdef topology_thread_siblings
define_siblings_show_func(thread_siblings);
define_one_ro(thread_siblings);
define_one_ro(thread_siblings_list);
#define ref_thread_siblings_attr	\
		&attr_thread_siblings.attr, &attr_thread_siblings_list.attr,
#else
#define ref_thread_siblings_attr
#endif

#ifdef topology_core_siblings
define_siblings_show_func(core_siblings);
define_one_ro(core_siblings);
define_one_ro(core_siblings_list);
#define ref_core_siblings_attr		\
		&attr_core_siblings.attr, &attr_core_siblings_list.attr,
#else
#define ref_core_siblings_attr
#endif

static struct attribute *default_attrs[] = {
	ref_physical_package_id_attr
	ref_core_id_attr
	ref_thread_siblings_attr
	ref_core_siblings_attr
	NULL
};

static struct attribute_group topology_attr_group = {
	.attrs = default_attrs,
	.name = "topology"
};

/* Add/Remove cpu_topology interface for CPU device */
static int __cpuinit topology_add_dev(unsigned int cpu)
{
	struct sys_device *sys_dev = get_cpu_sysdev(cpu);

	return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
}

static void __cpuinit topology_remove_dev(unsigned int cpu)
{
	struct sys_device *sys_dev = get_cpu_sysdev(cpu);

	sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
}

static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
					   unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;
	int rc = 0;

	switch (action) {
	case CPU_UP_PREPARE:
	case CPU_UP_PREPARE_FROZEN:
		rc = topology_add_dev(cpu);
		break;
	case CPU_UP_CANCELED:
	case CPU_UP_CANCELED_FROZEN:
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		topology_remove_dev(cpu);
		break;
	}
	return rc ? NOTIFY_BAD : NOTIFY_OK;
}

static int __cpuinit topology_sysfs_init(void)
{
	int cpu;
	int rc;

	for_each_online_cpu(cpu) {
		rc = topology_add_dev(cpu);
		if (rc)
			return rc;
	}
	hotcpu_notifier(topology_cpu_callback, 0);

	return 0;
}

device_initcall(topology_sysfs_init);
Commit	Line	Data
69dcc991 ZY	1	/*
	2	* driver/base/topology.c - Populate sysfs with cpu topology information
	3	*
	4	* Written by: Zhang Yanmin, Intel Corporation
	5	*
	6	* Copyright (C) 2006, Intel Corp.
	7	*
	8	* All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	18	* NON INFRINGEMENT. See the GNU General Public License for more
	19	* details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*
	25	*/
	26	#include <linux/sysdev.h>
	27	#include <linux/init.h>
	28	#include <linux/mm.h>
	29	#include <linux/cpu.h>
	30	#include <linux/module.h>
	31	#include <linux/topology.h>
	32
	33	#define define_one_ro(_name) \
	34	static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
	35
	36	#define define_id_show_func(name) \
	37	static ssize_t show_##name(struct sys_device dev, char buf) \
	38	{ \
	39	unsigned int cpu = dev->id; \
	40	return sprintf(buf, "%d\n", topology_##name(cpu)); \
	41	}
	42
39106dcf MT	43	static ssize_t show_cpumap(int type, cpumask_t mask, char buf)
	44	{
	45	ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
	46	int n = 0;
	47
	48	if (len > 1) {
	49	n = type?
	50	cpulist_scnprintf(buf, len-2, *mask):
	51	cpumask_scnprintf(buf, len-2, *mask);
	52	buf[n++] = '\n';
	53	buf[n] = '\0';
	54	}
	55	return n;
	56	}
	57
	58	#define define_siblings_show_map(name) \
	59	static inline ssize_t show_##name(struct sys_device dev, char buf) \
	60	{ \
	61	unsigned int cpu = dev->id; \
	62	return show_cpumap(0, &(topology_##name(cpu)), buf); \
	63	}
	64
	65	#define define_siblings_show_list(name) \
	66	static inline ssize_t show_##name##_list(struct sys_device dev, char buf) \
69dcc991	67	{ \
69dcc991	68	unsigned int cpu = dev->id; \
39106dcf	69	return show_cpumap(1, &(topology_##name(cpu)), buf); \
69dcc991 ZY	70	}
69dcc991 ZY	71
39106dcf MT	72	#define define_siblings_show_func(name) \
	73	define_siblings_show_map(name); define_siblings_show_list(name)
	74
69dcc991 ZY	75	#ifdef topology_physical_package_id
	76	define_id_show_func(physical_package_id);
	77	define_one_ro(physical_package_id);
	78	#define ref_physical_package_id_attr &attr_physical_package_id.attr,
	79	#else
	80	#define ref_physical_package_id_attr
	81	#endif
	82
	83	#ifdef topology_core_id
	84	define_id_show_func(core_id);
	85	define_one_ro(core_id);
	86	#define ref_core_id_attr &attr_core_id.attr,
	87	#else
	88	#define ref_core_id_attr
	89	#endif
	90
	91	#ifdef topology_thread_siblings
	92	define_siblings_show_func(thread_siblings);
	93	define_one_ro(thread_siblings);
39106dcf MT	94	define_one_ro(thread_siblings_list);
	95	#define ref_thread_siblings_attr \
	96	&attr_thread_siblings.attr, &attr_thread_siblings_list.attr,
69dcc991 ZY	97	#else
	98	#define ref_thread_siblings_attr
	99	#endif
	100
	101	#ifdef topology_core_siblings
	102	define_siblings_show_func(core_siblings);
	103	define_one_ro(core_siblings);
39106dcf MT	104	define_one_ro(core_siblings_list);
	105	#define ref_core_siblings_attr \
	106	&attr_core_siblings.attr, &attr_core_siblings_list.attr,
69dcc991 ZY	107	#else
	108	#define ref_core_siblings_attr
	109	#endif
	110
	111	static struct attribute *default_attrs[] = {
	112	ref_physical_package_id_attr
	113	ref_core_id_attr
	114	ref_thread_siblings_attr
	115	ref_core_siblings_attr
	116	NULL
	117	};
	118
	119	static struct attribute_group topology_attr_group = {
	120	.attrs = default_attrs,
	121	.name = "topology"
	122	};
	123
	124	/* Add/Remove cpu_topology interface for CPU device */
06a4bcae	125	static int __cpuinit topology_add_dev(unsigned int cpu)
69dcc991	126	{
06a4bcae HC	127	struct sys_device *sys_dev = get_cpu_sysdev(cpu);
06a4bcae HC	128
9780e3e9	129	return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
69dcc991 ZY	130	}
69dcc991 ZY	131
06a4bcae	132	static void __cpuinit topology_remove_dev(unsigned int cpu)
69dcc991	133	{
06a4bcae HC	134	struct sys_device *sys_dev = get_cpu_sysdev(cpu);
06a4bcae HC	135
69dcc991	136	sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
69dcc991 ZY	137	}
69dcc991 ZY	138
9c7b216d	139	static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
06a4bcae	140	unsigned long action, void *hcpu)
69dcc991 ZY	141	{
69dcc991 ZY	142	unsigned int cpu = (unsigned long)hcpu;
06a4bcae	143	int rc = 0;
69dcc991	144
69dcc991	145	switch (action) {
06a4bcae	146	case CPU_UP_PREPARE:
8bb78442	147	case CPU_UP_PREPARE_FROZEN:
06a4bcae	148	rc = topology_add_dev(cpu);
69dcc991	149	break;
06a4bcae	150	case CPU_UP_CANCELED:
8bb78442	151	case CPU_UP_CANCELED_FROZEN:
69dcc991	152	case CPU_DEAD:
8bb78442	153	case CPU_DEAD_FROZEN:
06a4bcae	154	topology_remove_dev(cpu);
69dcc991 ZY	155	break;
69dcc991 ZY	156	}
06a4bcae	157	return rc ? NOTIFY_BAD : NOTIFY_OK;
69dcc991	158	}
69dcc991 ZY	159
	160	static int __cpuinit topology_sysfs_init(void)
	161	{
06a4bcae HC	162	int cpu;
06a4bcae HC	163	int rc;
69dcc991	164
06a4bcae HC	165	for_each_online_cpu(cpu) {
	166	rc = topology_add_dev(cpu);
	167	if (rc)
	168	return rc;
69dcc991	169	}
06a4bcae	170	hotcpu_notifier(topology_cpu_callback, 0);
69dcc991 ZY	171
	172	return 0;
	173	}
	174
	175	device_initcall(topology_sysfs_init);