/*
   * 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/mm.h>
  #include <linux/cpu.h>
  #include <linux/module.h>

  #include <linux/hardirq.h>

  #include <linux/topology.h>

  #define define_id_show_func(name)				\

  static ssize_t name##_show(struct device *dev,			\

  		struct device_attribute *attr, char *buf)	\

  {								\

  	return sprintf(buf, "%d
  ", topology_##name(dev->id));	\

  }

  #define define_siblings_show_map(name, mask)				\
  static ssize_t name##_show(struct device *dev,				\

  			   struct device_attribute *attr, char *buf)	\

  {									\

  	return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\

  }

  #define define_siblings_show_list(name, mask)				\
  static ssize_t name##_list_show(struct device *dev,			\
  				struct device_attribute *attr,		\
  				char *buf)				\

  {									\

  	return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\

  }

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

  define_id_show_func(physical_package_id);

  static DEVICE_ATTR_RO(physical_package_id);

  define_id_show_func(core_id);

  static DEVICE_ATTR_RO(core_id);

  define_siblings_show_func(thread_siblings, sibling_cpumask);

  static DEVICE_ATTR_RO(thread_siblings);
  static DEVICE_ATTR_RO(thread_siblings_list);

  define_siblings_show_func(core_siblings, core_cpumask);
  static DEVICE_ATTR_RO(core_siblings);
  static DEVICE_ATTR_RO(core_siblings_list);

  #ifdef CONFIG_SCHED_BOOK
  define_id_show_func(book_id);

  static DEVICE_ATTR_RO(book_id);
  define_siblings_show_func(book_siblings, book_cpumask);
  static DEVICE_ATTR_RO(book_siblings);
  static DEVICE_ATTR_RO(book_siblings_list);

  #endif

  #ifdef CONFIG_SCHED_DRAWER
  define_id_show_func(drawer_id);
  static DEVICE_ATTR_RO(drawer_id);
  define_siblings_show_func(drawer_siblings, drawer_cpumask);
  static DEVICE_ATTR_RO(drawer_siblings);
  static DEVICE_ATTR_RO(drawer_siblings_list);
  #endif

  static struct attribute *default_attrs[] = {

  	&dev_attr_physical_package_id.attr,
  	&dev_attr_core_id.attr,
  	&dev_attr_thread_siblings.attr,
  	&dev_attr_thread_siblings_list.attr,
  	&dev_attr_core_siblings.attr,
  	&dev_attr_core_siblings_list.attr,

  #ifdef CONFIG_SCHED_BOOK

  	&dev_attr_book_id.attr,
  	&dev_attr_book_siblings.attr,
  	&dev_attr_book_siblings_list.attr,

  #endif

  #ifdef CONFIG_SCHED_DRAWER
  	&dev_attr_drawer_id.attr,
  	&dev_attr_drawer_siblings.attr,
  	&dev_attr_drawer_siblings_list.attr,
  #endif

  	NULL
  };
  
  static struct attribute_group topology_attr_group = {
  	.attrs = default_attrs,
  	.name = "topology"
  };
  
  /* Add/Remove cpu_topology interface for CPU device */

  static int topology_add_dev(unsigned int cpu)

  {

  	struct device *dev = get_cpu_device(cpu);

  	return sysfs_create_group(&dev->kobj, &topology_attr_group);

  }

  static void topology_remove_dev(unsigned int cpu)

  {

  	struct device *dev = get_cpu_device(cpu);

  	sysfs_remove_group(&dev->kobj, &topology_attr_group);

  }

  static int 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 notifier_from_errno(rc);

  }

  static int topology_sysfs_init(void)

  {

  	int cpu;

  	int rc = 0;
  
  	cpu_notifier_register_begin();

  	for_each_online_cpu(cpu) {
  		rc = topology_add_dev(cpu);
  		if (rc)

  			goto out;

  	}

  	__hotcpu_notifier(topology_cpu_callback, 0);

  out:
  	cpu_notifier_register_done();
  	return rc;

  }
  
  device_initcall(topology_sysfs_init);