arch/x86/platform/uv/uv_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * This file supports the /sys/firmware/sgi_uv interfaces for SGI UV.
   4  *
   5  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
   6  *  Copyright (c) Russ Anderson
   7  */
   8
   9 #include <linux/device.h>
  10 #include <asm/uv/bios.h>
  11 #include <asm/uv/uv.h>
  12
  13 struct kobject *sgi_uv_kobj;
  14
  15 static ssize_t partition_id_show(struct kobject *kobj,
  16                         struct kobj_attribute *attr, char *buf)
  17 {
  18         return snprintf(buf, PAGE_SIZE, "%ld\n", sn_partition_id);
  19 }
  20
  21 static ssize_t coherence_id_show(struct kobject *kobj,
  22                         struct kobj_attribute *attr, char *buf)
  23 {
  24         return snprintf(buf, PAGE_SIZE, "%ld\n", uv_partition_coherence_id());
  25 }
  26
  27 static struct kobj_attribute partition_id_attr =
  28         __ATTR(partition_id, S_IRUGO, partition_id_show, NULL);
  29
  30 static struct kobj_attribute coherence_id_attr =
  31         __ATTR(coherence_id, S_IRUGO, coherence_id_show, NULL);
  32
  33
  34 static int __init sgi_uv_sysfs_init(void)
  35 {
  36         unsigned long ret;
  37
  38         if (!is_uv_system())
  39                 return -ENODEV;
  40
  41         if (!sgi_uv_kobj)
  42                 sgi_uv_kobj = kobject_create_and_add("sgi_uv", firmware_kobj);
  43         if (!sgi_uv_kobj) {
  44                 printk(KERN_WARNING "kobject_create_and_add sgi_uv failed\n");
  45                 return -EINVAL;
  46         }
  47
  48         ret = sysfs_create_file(sgi_uv_kobj, &partition_id_attr.attr);
  49         if (ret) {
  50                 printk(KERN_WARNING "sysfs_create_file partition_id failed\n");
  51                 return ret;
  52         }
  53
  54         ret = sysfs_create_file(sgi_uv_kobj, &coherence_id_attr.attr);
  55         if (ret) {
  56                 printk(KERN_WARNING "sysfs_create_file coherence_id failed\n");
  57                 return ret;
  58         }
  59
  60         return 0;
  61 }
  62
  63 device_initcall(sgi_uv_sysfs_init);