1/*
2 * Interface for Dynamic Logical Partitioning of I/O Slots on
3 * RPA-compliant PPC64 platform.
4 *
5 * John Rose <johnrose@austin.ibm.com>
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
32static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
33			      const char *buf, size_t nbytes)
34{
35	char drc_name[MAX_DRC_NAME_LEN];
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
56static ssize_t add_slot_show(struct kobject *kobj,
57			     struct kobj_attribute *attr, char *buf)
58{
59	return sprintf(buf, "0\n");
60}
61
62static ssize_t remove_slot_store(struct kobject *kobj,
63				 struct kobj_attribute *attr,
64				 const char *buf, size_t nbytes)
65{
66	char drc_name[MAX_DRC_NAME_LEN];
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
87static ssize_t remove_slot_show(struct kobject *kobj,
88				struct kobj_attribute *attr, char *buf)
89{
90	return sprintf(buf, "0\n");
91}
92
93static struct kobj_attribute add_slot_attr =
94	__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
95
96static struct kobj_attribute remove_slot_attr =
97	__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
98
99static struct attribute *default_attrs[] = {
100	&add_slot_attr.attr,
101	&remove_slot_attr.attr,
102	NULL,
103};
104
105static struct attribute_group dlpar_attr_group = {
106	.attrs = default_attrs,
107};
108
109static struct kobject *dlpar_kobj;
110
111int dlpar_sysfs_init(void)
112{
113	int error;
114
115	dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
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
126void dlpar_sysfs_exit(void)
127{
128	sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
129	kobject_put(dlpar_kobj);
130}
131