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41 results

topology.c

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    Mike Travis authored and Ingo Molnar committed
    * Cleaned up references to cpumask_scnprintf() and added new
        cpulist_scnprintf() interfaces where appropriate.
    
      * Fix some small bugs (or code efficiency improvments) for various uses
        of cpumask_scnprintf.
    
      * Clean up some checkpatch errors.
    
    Signed-off-by: default avatarMike Travis <travis@sgi.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    39106dcf
    History
    topology.c 4.47 KiB
    /*
     * 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);