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rpadlpar_sysfs.c
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1 /*
2  * Interface for Dynamic Logical Partitioning of I/O Slots on
3  * RPA-compliant PPC64 platform.
4  *
5  * John Rose <[email protected]>
6  * October 2003
7  *
8  * Copyright (C) 2003 IBM.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version
13  * 2 of the License, or (at your option) any later version.
14  */
15 #include <linux/kobject.h>
16 #include <linux/string.h>
17 #include <linux/pci.h>
18 #include <linux/pci_hotplug.h>
19 #include "rpadlpar.h"
20 #include "../pci.h"
21 
22 #define DLPAR_KOBJ_NAME "control"
23 
24 /* Those two have no quotes because they are passed to __ATTR() which
25  * stringifies the argument (yuck !)
26  */
27 #define ADD_SLOT_ATTR_NAME add_slot
28 #define REMOVE_SLOT_ATTR_NAME remove_slot
29 
30 #define MAX_DRC_NAME_LEN 64
31 
32 static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
33  const char *buf, size_t nbytes)
34 {
36  char *end;
37  int rc;
38 
39  if (nbytes >= MAX_DRC_NAME_LEN)
40  return 0;
41 
42  memcpy(drc_name, buf, nbytes);
43 
44  end = strchr(drc_name, '\n');
45  if (!end)
46  end = &drc_name[nbytes];
47  *end = '\0';
48 
49  rc = dlpar_add_slot(drc_name);
50  if (rc)
51  return rc;
52 
53  return nbytes;
54 }
55 
56 static ssize_t add_slot_show(struct kobject *kobj,
57  struct kobj_attribute *attr, char *buf)
58 {
59  return sprintf(buf, "0\n");
60 }
61 
62 static ssize_t remove_slot_store(struct kobject *kobj,
63  struct kobj_attribute *attr,
64  const char *buf, size_t nbytes)
65 {
67  int rc;
68  char *end;
69 
70  if (nbytes >= MAX_DRC_NAME_LEN)
71  return 0;
72 
73  memcpy(drc_name, buf, nbytes);
74 
75  end = strchr(drc_name, '\n');
76  if (!end)
77  end = &drc_name[nbytes];
78  *end = '\0';
79 
80  rc = dlpar_remove_slot(drc_name);
81  if (rc)
82  return rc;
83 
84  return nbytes;
85 }
86 
87 static ssize_t remove_slot_show(struct kobject *kobj,
88  struct kobj_attribute *attr, char *buf)
89 {
90  return sprintf(buf, "0\n");
91 }
92 
93 static struct kobj_attribute add_slot_attr =
94  __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
95 
96 static struct kobj_attribute remove_slot_attr =
97  __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
98 
99 static struct attribute *default_attrs[] = {
100  &add_slot_attr.attr,
101  &remove_slot_attr.attr,
102  NULL,
103 };
104 
105 static struct attribute_group dlpar_attr_group = {
106  .attrs = default_attrs,
107 };
108 
109 static struct kobject *dlpar_kobj;
110 
112 {
113  int error;
114 
116  &pci_slots_kset->kobj);
117  if (!dlpar_kobj)
118  return -EINVAL;
119 
120  error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
121  if (error)
122  kobject_put(dlpar_kobj);
123  return error;
124 }
125 
127 {
128  sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
129  kobject_put(dlpar_kobj);
130 }