source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/drivers/xen/balloon/sysfs.c @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 4.7 KB
Line 
1/******************************************************************************
2 * balloon/sysfs.c
3 *
4 * Xen balloon driver - sysfs interfaces.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation; or, when distributed
9 * separately from the Linux kernel or incorporated into other
10 * software packages, subject to the following license:
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this source file (the "Software"), to deal in the Software without
14 * restriction, including without limitation the rights to use, copy, modify,
15 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
16 * and to permit persons to whom the Software is furnished to do so, subject to
17 * the following conditions:
18 *
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
28 * IN THE SOFTWARE.
29 */
30
31#include <linux/capability.h>
32#include <linux/errno.h>
33#include <linux/stat.h>
34#include <linux/string.h>
35#include <linux/sysdev.h>
36#include "common.h"
37
38#ifdef HAVE_XEN_PLATFORM_COMPAT_H
39#include <xen/platform-compat.h>
40#endif
41
42#define BALLOON_CLASS_NAME "memory"
43
44#define BALLOON_SHOW(name, format, args...)                     \
45        static ssize_t show_##name(struct sys_device *dev,      \
46                                   char *buf)                   \
47        {                                                       \
48                return sprintf(buf, format, ##args);            \
49        }                                                       \
50        static SYSDEV_ATTR(name, S_IRUGO, show_##name, NULL)
51
52BALLOON_SHOW(current_kb, "%lu\n", PAGES2KB(bs.current_pages));
53BALLOON_SHOW(low_kb, "%lu\n", PAGES2KB(bs.balloon_low));
54BALLOON_SHOW(high_kb, "%lu\n", PAGES2KB(bs.balloon_high));
55BALLOON_SHOW(hard_limit_kb,
56             (bs.hard_limit!=~0UL) ? "%lu\n" : "???\n",
57             (bs.hard_limit!=~0UL) ? PAGES2KB(bs.hard_limit) : 0);
58BALLOON_SHOW(driver_kb, "%lu\n", PAGES2KB(bs.driver_pages));
59
60static ssize_t show_target_kb(struct sys_device *dev, char *buf)
61{
62        return sprintf(buf, "%lu\n", PAGES2KB(bs.target_pages));
63}
64
65static ssize_t store_target_kb(struct sys_device *dev,
66                               const char *buf,
67                               size_t count)
68{
69        char memstring[64], *endchar;
70        unsigned long long target_bytes;
71
72        if (!capable(CAP_SYS_ADMIN))
73                return -EPERM;
74       
75        if (count <= 1)
76                return -EBADMSG; /* runt */
77        if (count > sizeof(memstring))
78                return -EFBIG;   /* too long */
79        strcpy(memstring, buf);
80       
81        target_bytes = memparse(memstring, &endchar);
82        balloon_set_new_target(target_bytes >> PAGE_SHIFT);
83       
84        return count;
85}
86
87static SYSDEV_ATTR(target_kb, S_IRUGO | S_IWUSR,
88                   show_target_kb, store_target_kb);
89
90static struct sysdev_attribute *balloon_attrs[] = {
91        &attr_target_kb,
92};
93
94static struct attribute *balloon_info_attrs[] = {
95        &attr_current_kb.attr,
96        &attr_low_kb.attr,
97        &attr_high_kb.attr,
98        &attr_hard_limit_kb.attr,
99        &attr_driver_kb.attr,
100        NULL
101};
102
103static struct attribute_group balloon_info_group = {
104        .name = "info",
105        .attrs = balloon_info_attrs,
106};
107
108static struct sysdev_class balloon_sysdev_class = {
109        set_kset_name(BALLOON_CLASS_NAME),
110};
111
112static struct sys_device balloon_sysdev;
113
114static int register_balloon(struct sys_device *sysdev)
115{
116        int i, error;
117
118        error = sysdev_class_register(&balloon_sysdev_class);
119        if (error)
120                return error;
121
122        sysdev->id = 0;
123        sysdev->cls = &balloon_sysdev_class;
124
125        error = sysdev_register(sysdev);
126        if (error) {
127                sysdev_class_unregister(&balloon_sysdev_class);
128                return error;
129        }
130
131        for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++) {
132                error = sysdev_create_file(sysdev, balloon_attrs[i]);
133                if (error)
134                        goto fail;
135        }
136
137        error = sysfs_create_group(&sysdev->kobj, &balloon_info_group);
138        if (error)
139                goto fail;
140       
141        return 0;
142
143 fail:
144        while (--i >= 0)
145                sysdev_remove_file(sysdev, balloon_attrs[i]);
146        sysdev_unregister(sysdev);
147        sysdev_class_unregister(&balloon_sysdev_class);
148        return error;
149}
150
151static void unregister_balloon(struct sys_device *sysdev)
152{
153        int i;
154
155        sysfs_remove_group(&sysdev->kobj, &balloon_info_group);
156        for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++)
157                sysdev_remove_file(sysdev, balloon_attrs[i]);
158        sysdev_unregister(sysdev);
159        sysdev_class_unregister(&balloon_sysdev_class);
160}
161
162int balloon_sysfs_init(void)
163{
164        return register_balloon(&balloon_sysdev);
165}
166
167void balloon_sysfs_exit(void)
168{
169        unregister_balloon(&balloon_sysdev);
170}
Note: See TracBrowser for help on using the repository browser.