aboutsummaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug/rpadlpar_sysfs.c
blob: a796301ea03fbd3709f15be52f78053bb12380f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Interface for Dynamic Logical Partitioning of I/O Slots on
 * RPA-compliant PPC64 platform.
 *
 * John Rose <johnrose@austin.ibm.com>
 * October 2003
 *
 * Copyright (C) 2003 IBM.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include "rpadlpar.h"
#include "../pci.h"

#define DLPAR_KOBJ_NAME       "control"

/* Those two have no quotes because they are passed to __ATTR() which
 * stringifies the argument (yuck !)
 */
#define ADD_SLOT_ATTR_NAME    add_slot
#define REMOVE_SLOT_ATTR_NAME remove_slot

#define MAX_DRC_NAME_LEN 64

static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
			      const char *buf, size_t nbytes)
{
	char drc_name[MAX_DRC_NAME_LEN];
	char *end;
	int rc;

	if (nbytes >= MAX_DRC_NAME_LEN)
		return 0;

	memcpy(drc_name, buf, nbytes);

	end = strchr(drc_name, '\n');
	if (!end)
		end = &drc_name[nbytes];
	*end = '\0';

	rc = dlpar_add_slot(drc_name);
	if (rc)
		return rc;

	return nbytes;
}

static ssize_t add_slot_show(struct kobject *kobj,
			     struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "0\n");
}

static ssize_t remove_slot_store(struct kobject *kobj,
				 struct kobj_attribute *attr,
				 const char *buf, size_t nbytes)
{
	char drc_name[MAX_DRC_NAME_LEN];
	int rc;
	char *end;

	if (nbytes >= MAX_DRC_NAME_LEN)
		return 0;

	memcpy(drc_name, buf, nbytes);

	end = strchr(drc_name, '\n');
	if (!end)
		end = &drc_name[nbytes];
	*end = '\0';

	rc = dlpar_remove_slot(drc_name);
	if (rc)
		return rc;

	return nbytes;
}

static ssize_t remove_slot_show(struct kobject *kobj,
				struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "0\n");
}

static struct kobj_attribute add_slot_attr =
	__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);

static struct kobj_attribute remove_slot_attr =
	__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);

static struct attribute *default_attrs[] = {
	&add_slot_attr.attr,
	&remove_slot_attr.attr,
	NULL,
};

static struct attribute_group dlpar_attr_group = {
	.attrs = default_attrs,
};

static struct kobject *dlpar_kobj;

int dlpar_sysfs_init(void)
{
	int error;

	dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
					    &pci_slots_kset->kobj);
	if (!dlpar_kobj)
		return -EINVAL;

	error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
	if (error)
		kobject_put(dlpar_kobj);
	return error;
}

void dlpar_sysfs_exit(void)
{
	sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
	kobject_put(dlpar_kobj);
}