release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/kernel/uv_sysfs.c

   1 /*
   2  * This file supports the /sys/firmware/sgi_uv interfaces for SGI UV.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  *
  18  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
  19  *  Copyright (c) Russ Anderson
  20  */
  21
  22 #include <linux/sysdev.h>
  23 #include <asm/uv/bios.h>
  24 #include <asm/uv/uv.h>
  25
  26 struct kobject *sgi_uv_kobj;
  27
  28 static ssize_t partition_id_show(struct kobject *kobj,
  29                         struct kobj_attribute *attr, char *buf)
  30 {
  31         return snprintf(buf, PAGE_SIZE, "%ld\n", sn_partition_id);
  32 }
  33
  34 static ssize_t coherence_id_show(struct kobject *kobj,
  35                         struct kobj_attribute *attr, char *buf)
  36 {
  37         return snprintf(buf, PAGE_SIZE, "%ld\n", partition_coherence_id());
  38 }
  39
  40 static struct kobj_attribute partition_id_attr =
  41         __ATTR(partition_id, S_IRUGO, partition_id_show, NULL);
  42
  43 static struct kobj_attribute coherence_id_attr =
  44         __ATTR(coherence_id, S_IRUGO, coherence_id_show, NULL);
  45
  46
  47 static int __init sgi_uv_sysfs_init(void)
  48 {
  49         unsigned long ret;
  50
  51         if (!is_uv_system())
  52                 return -ENODEV;
  53
  54         if (!sgi_uv_kobj)
  55                 sgi_uv_kobj = kobject_create_and_add("sgi_uv", firmware_kobj);
  56         if (!sgi_uv_kobj) {
  57                 printk(KERN_WARNING "kobject_create_and_add sgi_uv failed\n");
  58                 return -EINVAL;
  59         }
  60
  61         ret = sysfs_create_file(sgi_uv_kobj, &partition_id_attr.attr);
  62         if (ret) {
  63                 printk(KERN_WARNING "sysfs_create_file partition_id failed\n");
  64                 return ret;
  65         }
  66
  67         ret = sysfs_create_file(sgi_uv_kobj, &coherence_id_attr.attr);
  68         if (ret) {
  69                 printk(KERN_WARNING "sysfs_create_file coherence_id failed\n");
  70                 return ret;
  71         }
  72
  73         return 0;
  74 }
  75
  76 device_initcall(sgi_uv_sysfs_init);