1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Interface for Dynamic Logical Partitioning of I/O Slots on
4 * RPA-compliant PPC64 platform.
5 *
6 * John Rose <johnrose@austin.ibm.com>
7 * October 2003
8 *
9 * Copyright (C) 2003 IBM.
10 */
11#include <linux/kobject.h>
12#include <linux/string.h>
13#include <linux/pci.h>
14#include <linux/pci_hotplug.h>
15#include "rpaphp.h"
16#include "rpadlpar.h"
17#include "../pci.h"
18
19#define DLPAR_KOBJ_NAME       "control"
20
21/* Those two have no quotes because they are passed to __ATTR() which
22 * stringifies the argument (yuck !)
23 */
24#define ADD_SLOT_ATTR_NAME    add_slot
25#define REMOVE_SLOT_ATTR_NAME remove_slot
26
27static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
28			      const char *buf, size_t nbytes)
29{
30	char drc_name[MAX_DRC_NAME_LEN];
31	char *end;
32	int rc;
33
34	if (nbytes >= MAX_DRC_NAME_LEN)
35		return 0;
36
37	strscpy(drc_name, buf, nbytes + 1);
38
39	end = strchr(drc_name, '\n');
40	if (end)
41		*end = '\0';
42
43	rc = dlpar_add_slot(drc_name);
44	if (rc)
45		return rc;
46
47	return nbytes;
48}
49
50static ssize_t add_slot_show(struct kobject *kobj,
51			     struct kobj_attribute *attr, char *buf)
52{
53	return sysfs_emit(buf, "0\n");
54}
55
56static ssize_t remove_slot_store(struct kobject *kobj,
57				 struct kobj_attribute *attr,
58				 const char *buf, size_t nbytes)
59{
60	char drc_name[MAX_DRC_NAME_LEN];
61	int rc;
62	char *end;
63
64	if (nbytes >= MAX_DRC_NAME_LEN)
65		return 0;
66
67	strscpy(drc_name, buf, nbytes + 1);
68
69	end = strchr(drc_name, '\n');
70	if (end)
71		*end = '\0';
72
73	rc = dlpar_remove_slot(drc_name);
74	if (rc)
75		return rc;
76
77	return nbytes;
78}
79
80static ssize_t remove_slot_show(struct kobject *kobj,
81				struct kobj_attribute *attr, char *buf)
82{
83	return sysfs_emit(buf, "0\n");
84}
85
86static struct kobj_attribute add_slot_attr =
87	__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
88
89static struct kobj_attribute remove_slot_attr =
90	__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
91
92static struct attribute *default_attrs[] = {
93	&add_slot_attr.attr,
94	&remove_slot_attr.attr,
95	NULL,
96};
97
98static const struct attribute_group dlpar_attr_group = {
99	.attrs = default_attrs,
100};
101
102static struct kobject *dlpar_kobj;
103
104int dlpar_sysfs_init(void)
105{
106	int error;
107
108	dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
109					    &pci_slots_kset->kobj);
110	if (!dlpar_kobj)
111		return -EINVAL;
112
113	error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
114	if (error)
115		kobject_put(dlpar_kobj);
116	return error;
117}
118
119void dlpar_sysfs_exit(void)
120{
121	sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
122	kobject_put(dlpar_kobj);
123}
124