Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/power/user.c |
| 3 | * |
| 4 | * This file provides the user space interface for software suspend/resume. |
| 5 | * |
| 6 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
| 7 | * |
| 8 | * This file is released under the GPLv2. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/suspend.h> |
| 13 | #include <linux/syscalls.h> |
Stefan Seyfried | 3592695 | 2006-12-06 20:34:06 -0800 | [diff] [blame] | 14 | #include <linux/reboot.h> |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 15 | #include <linux/string.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/miscdevice.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/swap.h> |
| 20 | #include <linux/swapops.h> |
| 21 | #include <linux/pm.h> |
| 22 | #include <linux/fs.h> |
Rafael J. Wysocki | 97c7801 | 2006-10-11 01:20:45 -0700 | [diff] [blame] | 23 | #include <linux/console.h> |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 24 | #include <linux/cpu.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 25 | #include <linux/freezer.h> |
Alan Cox | 52d1102 | 2008-06-11 22:07:52 +0200 | [diff] [blame^] | 26 | #include <linux/smp_lock.h> |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 27 | |
| 28 | #include <asm/uaccess.h> |
| 29 | |
| 30 | #include "power.h" |
| 31 | |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 32 | /* |
Rafael J. Wysocki | 96f7374 | 2007-10-26 01:02:15 +0200 | [diff] [blame] | 33 | * NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and |
| 34 | * will be removed in the future. They are only preserved here for |
| 35 | * compatibility with existing userland utilities. |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 36 | */ |
Rafael J. Wysocki | 96f7374 | 2007-10-26 01:02:15 +0200 | [diff] [blame] | 37 | #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int) |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 38 | #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int) |
| 39 | |
| 40 | #define PMOPS_PREPARE 1 |
| 41 | #define PMOPS_ENTER 2 |
| 42 | #define PMOPS_FINISH 3 |
| 43 | |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 44 | /* |
| 45 | * NOTE: The following ioctl definitions are wrong and have been replaced with |
| 46 | * correct ones. They are only preserved here for compatibility with existing |
| 47 | * userland utilities and will be removed in the future. |
| 48 | */ |
| 49 | #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *) |
| 50 | #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long) |
| 51 | #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *) |
| 52 | #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *) |
| 53 | |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 54 | |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 55 | #define SNAPSHOT_MINOR 231 |
| 56 | |
| 57 | static struct snapshot_data { |
| 58 | struct snapshot_handle handle; |
| 59 | int swap; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 60 | int mode; |
| 61 | char frozen; |
| 62 | char ready; |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 63 | char platform_support; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 64 | } snapshot_state; |
| 65 | |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 66 | atomic_t snapshot_device_available = ATOMIC_INIT(1); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 67 | |
| 68 | static int snapshot_open(struct inode *inode, struct file *filp) |
| 69 | { |
| 70 | struct snapshot_data *data; |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 71 | int error; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 72 | |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 73 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 74 | return -EBUSY; |
| 75 | |
Rafael J. Wysocki | 1525a2a | 2007-05-06 14:50:44 -0700 | [diff] [blame] | 76 | if ((filp->f_flags & O_ACCMODE) == O_RDWR) { |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 77 | atomic_inc(&snapshot_device_available); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 78 | return -ENOSYS; |
Rafael J. Wysocki | 1525a2a | 2007-05-06 14:50:44 -0700 | [diff] [blame] | 79 | } |
| 80 | if(create_basic_memory_bitmaps()) { |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 81 | atomic_inc(&snapshot_device_available); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 82 | return -ENOMEM; |
Rafael J. Wysocki | 1525a2a | 2007-05-06 14:50:44 -0700 | [diff] [blame] | 83 | } |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 84 | nonseekable_open(inode, filp); |
| 85 | data = &snapshot_state; |
| 86 | filp->private_data = data; |
| 87 | memset(&data->handle, 0, sizeof(struct snapshot_handle)); |
| 88 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) { |
Rafael J. Wysocki | 915bae9 | 2006-12-06 20:34:07 -0800 | [diff] [blame] | 89 | data->swap = swsusp_resume_device ? |
Rafael J. Wysocki | 7bf2368 | 2007-01-05 16:36:28 -0800 | [diff] [blame] | 90 | swap_type_of(swsusp_resume_device, 0, NULL) : -1; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 91 | data->mode = O_RDONLY; |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 92 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
| 93 | if (error) |
| 94 | pm_notifier_call_chain(PM_POST_RESTORE); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 95 | } else { |
| 96 | data->swap = -1; |
| 97 | data->mode = O_WRONLY; |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 98 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
| 99 | if (error) |
| 100 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
| 101 | } |
| 102 | if (error) { |
| 103 | atomic_inc(&snapshot_device_available); |
| 104 | return error; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 105 | } |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 106 | data->frozen = 0; |
| 107 | data->ready = 0; |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 108 | data->platform_support = 0; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static int snapshot_release(struct inode *inode, struct file *filp) |
| 114 | { |
| 115 | struct snapshot_data *data; |
| 116 | |
| 117 | swsusp_free(); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 118 | free_basic_memory_bitmaps(); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 119 | data = filp->private_data; |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 120 | free_all_swap_pages(data->swap); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 121 | if (data->frozen) { |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 122 | mutex_lock(&pm_mutex); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 123 | thaw_processes(); |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 124 | mutex_unlock(&pm_mutex); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 125 | } |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 126 | pm_notifier_call_chain(data->mode == O_WRONLY ? |
| 127 | PM_POST_HIBERNATION : PM_POST_RESTORE); |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 128 | atomic_inc(&snapshot_device_available); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static ssize_t snapshot_read(struct file *filp, char __user *buf, |
| 133 | size_t count, loff_t *offp) |
| 134 | { |
| 135 | struct snapshot_data *data; |
| 136 | ssize_t res; |
| 137 | |
| 138 | data = filp->private_data; |
Rafael J. Wysocki | 2f41ddd | 2007-06-16 10:16:03 -0700 | [diff] [blame] | 139 | if (!data->ready) |
| 140 | return -ENODATA; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 141 | res = snapshot_read_next(&data->handle, count); |
| 142 | if (res > 0) { |
| 143 | if (copy_to_user(buf, data_of(data->handle), res)) |
| 144 | res = -EFAULT; |
| 145 | else |
| 146 | *offp = data->handle.offset; |
| 147 | } |
| 148 | return res; |
| 149 | } |
| 150 | |
| 151 | static ssize_t snapshot_write(struct file *filp, const char __user *buf, |
| 152 | size_t count, loff_t *offp) |
| 153 | { |
| 154 | struct snapshot_data *data; |
| 155 | ssize_t res; |
| 156 | |
| 157 | data = filp->private_data; |
| 158 | res = snapshot_write_next(&data->handle, count); |
| 159 | if (res > 0) { |
| 160 | if (copy_from_user(data_of(data->handle), buf, res)) |
| 161 | res = -EFAULT; |
| 162 | else |
| 163 | *offp = data->handle.offset; |
| 164 | } |
| 165 | return res; |
| 166 | } |
| 167 | |
Alan Cox | 52d1102 | 2008-06-11 22:07:52 +0200 | [diff] [blame^] | 168 | static long snapshot_ioctl(struct file *filp, unsigned int cmd, |
| 169 | unsigned long arg) |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 170 | { |
| 171 | int error = 0; |
| 172 | struct snapshot_data *data; |
Rafael J. Wysocki | af508b3 | 2007-10-26 00:59:31 +0200 | [diff] [blame] | 173 | loff_t size; |
Rafael J. Wysocki | 3aef83e | 2006-12-06 20:34:10 -0800 | [diff] [blame] | 174 | sector_t offset; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 175 | |
| 176 | if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC) |
| 177 | return -ENOTTY; |
| 178 | if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR) |
| 179 | return -ENOTTY; |
| 180 | if (!capable(CAP_SYS_ADMIN)) |
| 181 | return -EPERM; |
| 182 | |
| 183 | data = filp->private_data; |
| 184 | |
Alan Cox | 52d1102 | 2008-06-11 22:07:52 +0200 | [diff] [blame^] | 185 | lock_kernel(); |
| 186 | |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 187 | switch (cmd) { |
| 188 | |
| 189 | case SNAPSHOT_FREEZE: |
| 190 | if (data->frozen) |
| 191 | break; |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 192 | mutex_lock(&pm_mutex); |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 193 | printk("Syncing filesystems ... "); |
| 194 | sys_sync(); |
| 195 | printk("done.\n"); |
Rafael J. Wysocki | 232b143 | 2007-10-18 03:04:44 -0700 | [diff] [blame] | 196 | |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 197 | error = freeze_processes(); |
Rafael J. Wysocki | b10d911 | 2007-07-19 01:47:36 -0700 | [diff] [blame] | 198 | if (error) |
Alan Stern | c3e94d8 | 2007-11-19 23:38:25 +0100 | [diff] [blame] | 199 | thaw_processes(); |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 200 | mutex_unlock(&pm_mutex); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 201 | if (!error) |
| 202 | data->frozen = 1; |
| 203 | break; |
| 204 | |
| 205 | case SNAPSHOT_UNFREEZE: |
Rafael J. Wysocki | 2f41ddd | 2007-06-16 10:16:03 -0700 | [diff] [blame] | 206 | if (!data->frozen || data->ready) |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 207 | break; |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 208 | mutex_lock(&pm_mutex); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 209 | thaw_processes(); |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 210 | mutex_unlock(&pm_mutex); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 211 | data->frozen = 0; |
| 212 | break; |
| 213 | |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 214 | case SNAPSHOT_CREATE_IMAGE: |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 215 | case SNAPSHOT_ATOMIC_SNAPSHOT: |
| 216 | if (data->mode != O_RDONLY || !data->frozen || data->ready) { |
| 217 | error = -EPERM; |
| 218 | break; |
| 219 | } |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 220 | error = hibernation_snapshot(data->platform_support); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 221 | if (!error) |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 222 | error = put_user(in_suspend, (int __user *)arg); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 223 | if (!error) |
| 224 | data->ready = 1; |
| 225 | break; |
| 226 | |
| 227 | case SNAPSHOT_ATOMIC_RESTORE: |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 228 | snapshot_write_finalize(&data->handle); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 229 | if (data->mode != O_WRONLY || !data->frozen || |
| 230 | !snapshot_image_loaded(&data->handle)) { |
| 231 | error = -EPERM; |
| 232 | break; |
| 233 | } |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 234 | error = hibernation_restore(data->platform_support); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 235 | break; |
| 236 | |
| 237 | case SNAPSHOT_FREE: |
| 238 | swsusp_free(); |
| 239 | memset(&data->handle, 0, sizeof(struct snapshot_handle)); |
| 240 | data->ready = 0; |
| 241 | break; |
| 242 | |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 243 | case SNAPSHOT_PREF_IMAGE_SIZE: |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 244 | case SNAPSHOT_SET_IMAGE_SIZE: |
| 245 | image_size = arg; |
| 246 | break; |
| 247 | |
Rafael J. Wysocki | af508b3 | 2007-10-26 00:59:31 +0200 | [diff] [blame] | 248 | case SNAPSHOT_GET_IMAGE_SIZE: |
| 249 | if (!data->ready) { |
| 250 | error = -ENODATA; |
| 251 | break; |
| 252 | } |
| 253 | size = snapshot_get_image_size(); |
| 254 | size <<= PAGE_SHIFT; |
| 255 | error = put_user(size, (loff_t __user *)arg); |
| 256 | break; |
| 257 | |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 258 | case SNAPSHOT_AVAIL_SWAP_SIZE: |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 259 | case SNAPSHOT_AVAIL_SWAP: |
Rafael J. Wysocki | af508b3 | 2007-10-26 00:59:31 +0200 | [diff] [blame] | 260 | size = count_swap_pages(data->swap, 1); |
| 261 | size <<= PAGE_SHIFT; |
| 262 | error = put_user(size, (loff_t __user *)arg); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 263 | break; |
| 264 | |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 265 | case SNAPSHOT_ALLOC_SWAP_PAGE: |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 266 | case SNAPSHOT_GET_SWAP_PAGE: |
| 267 | if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { |
| 268 | error = -ENODEV; |
| 269 | break; |
| 270 | } |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 271 | offset = alloc_swapdev_block(data->swap); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 272 | if (offset) { |
| 273 | offset <<= PAGE_SHIFT; |
Rafael J. Wysocki | cc5d207 | 2007-10-26 01:03:33 +0200 | [diff] [blame] | 274 | error = put_user(offset, (loff_t __user *)arg); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 275 | } else { |
| 276 | error = -ENOSPC; |
| 277 | } |
| 278 | break; |
| 279 | |
| 280 | case SNAPSHOT_FREE_SWAP_PAGES: |
| 281 | if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { |
| 282 | error = -ENODEV; |
| 283 | break; |
| 284 | } |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 285 | free_all_swap_pages(data->swap); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 286 | break; |
| 287 | |
Rafael J. Wysocki | 96f7374 | 2007-10-26 01:02:15 +0200 | [diff] [blame] | 288 | case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */ |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 289 | if (!swsusp_swap_in_use()) { |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 290 | /* |
| 291 | * User space encodes device types as two-byte values, |
| 292 | * so we need to recode them |
| 293 | */ |
| 294 | if (old_decode_dev(arg)) { |
Rafael J. Wysocki | 7bf2368 | 2007-01-05 16:36:28 -0800 | [diff] [blame] | 295 | data->swap = swap_type_of(old_decode_dev(arg), |
| 296 | 0, NULL); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 297 | if (data->swap < 0) |
| 298 | error = -ENODEV; |
| 299 | } else { |
| 300 | data->swap = -1; |
| 301 | error = -EINVAL; |
| 302 | } |
| 303 | } else { |
| 304 | error = -EPERM; |
| 305 | } |
| 306 | break; |
| 307 | |
Luca Tettamanti | 9b23820 | 2006-03-23 03:00:09 -0800 | [diff] [blame] | 308 | case SNAPSHOT_S2RAM: |
| 309 | if (!data->frozen) { |
| 310 | error = -EPERM; |
| 311 | break; |
| 312 | } |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 313 | if (!mutex_trylock(&pm_mutex)) { |
Luca Tettamanti | 9b23820 | 2006-03-23 03:00:09 -0800 | [diff] [blame] | 314 | error = -EBUSY; |
| 315 | break; |
| 316 | } |
Rafael J. Wysocki | 6c961df | 2007-07-19 01:47:38 -0700 | [diff] [blame] | 317 | /* |
| 318 | * Tasks are frozen and the notifiers have been called with |
| 319 | * PM_HIBERNATION_PREPARE |
| 320 | */ |
| 321 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); |
Stephen Hemminger | a6d7098 | 2006-12-06 20:34:35 -0800 | [diff] [blame] | 322 | mutex_unlock(&pm_mutex); |
Luca Tettamanti | 9b23820 | 2006-03-23 03:00:09 -0800 | [diff] [blame] | 323 | break; |
| 324 | |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 325 | case SNAPSHOT_PLATFORM_SUPPORT: |
| 326 | data->platform_support = !!arg; |
| 327 | break; |
| 328 | |
| 329 | case SNAPSHOT_POWER_OFF: |
| 330 | if (data->platform_support) |
| 331 | error = hibernation_platform_enter(); |
| 332 | break; |
| 333 | |
| 334 | case SNAPSHOT_PMOPS: /* This ioctl is deprecated */ |
Rafael J. Wysocki | 2b5b09b | 2007-02-10 01:43:35 -0800 | [diff] [blame] | 335 | error = -EINVAL; |
| 336 | |
Stefan Seyfried | 3592695 | 2006-12-06 20:34:06 -0800 | [diff] [blame] | 337 | switch (arg) { |
| 338 | |
| 339 | case PMOPS_PREPARE: |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 340 | data->platform_support = 1; |
Rafael J. Wysocki | 7777fab | 2007-07-19 01:47:29 -0700 | [diff] [blame] | 341 | error = 0; |
Stefan Seyfried | 3592695 | 2006-12-06 20:34:06 -0800 | [diff] [blame] | 342 | break; |
| 343 | |
| 344 | case PMOPS_ENTER: |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 345 | if (data->platform_support) |
Rafael J. Wysocki | 7777fab | 2007-07-19 01:47:29 -0700 | [diff] [blame] | 346 | error = hibernation_platform_enter(); |
Stefan Seyfried | 3592695 | 2006-12-06 20:34:06 -0800 | [diff] [blame] | 347 | break; |
| 348 | |
| 349 | case PMOPS_FINISH: |
Rafael J. Wysocki | eb57c1c | 2007-10-26 01:01:10 +0200 | [diff] [blame] | 350 | if (data->platform_support) |
Rafael J. Wysocki | 2b5b09b | 2007-02-10 01:43:35 -0800 | [diff] [blame] | 351 | error = 0; |
Stefan Seyfried | 3592695 | 2006-12-06 20:34:06 -0800 | [diff] [blame] | 352 | break; |
| 353 | |
| 354 | default: |
| 355 | printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg); |
Stefan Seyfried | 3592695 | 2006-12-06 20:34:06 -0800 | [diff] [blame] | 356 | |
| 357 | } |
| 358 | break; |
| 359 | |
Rafael J. Wysocki | 37b2ba1 | 2006-12-06 20:34:15 -0800 | [diff] [blame] | 360 | case SNAPSHOT_SET_SWAP_AREA: |
Rafael J. Wysocki | d1d241c | 2007-05-06 14:50:47 -0700 | [diff] [blame] | 361 | if (swsusp_swap_in_use()) { |
Rafael J. Wysocki | 37b2ba1 | 2006-12-06 20:34:15 -0800 | [diff] [blame] | 362 | error = -EPERM; |
| 363 | } else { |
| 364 | struct resume_swap_area swap_area; |
| 365 | dev_t swdev; |
| 366 | |
| 367 | error = copy_from_user(&swap_area, (void __user *)arg, |
| 368 | sizeof(struct resume_swap_area)); |
| 369 | if (error) { |
| 370 | error = -EFAULT; |
| 371 | break; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * User space encodes device types as two-byte values, |
| 376 | * so we need to recode them |
| 377 | */ |
| 378 | swdev = old_decode_dev(swap_area.dev); |
| 379 | if (swdev) { |
| 380 | offset = swap_area.offset; |
Rafael J. Wysocki | 7bf2368 | 2007-01-05 16:36:28 -0800 | [diff] [blame] | 381 | data->swap = swap_type_of(swdev, offset, NULL); |
Rafael J. Wysocki | 37b2ba1 | 2006-12-06 20:34:15 -0800 | [diff] [blame] | 382 | if (data->swap < 0) |
| 383 | error = -ENODEV; |
| 384 | } else { |
| 385 | data->swap = -1; |
| 386 | error = -EINVAL; |
| 387 | } |
| 388 | } |
| 389 | break; |
| 390 | |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 391 | default: |
| 392 | error = -ENOTTY; |
| 393 | |
| 394 | } |
Alan Cox | 52d1102 | 2008-06-11 22:07:52 +0200 | [diff] [blame^] | 395 | unlock_kernel(); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 396 | return error; |
| 397 | } |
| 398 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 399 | static const struct file_operations snapshot_fops = { |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 400 | .open = snapshot_open, |
| 401 | .release = snapshot_release, |
| 402 | .read = snapshot_read, |
| 403 | .write = snapshot_write, |
| 404 | .llseek = no_llseek, |
Alan Cox | 52d1102 | 2008-06-11 22:07:52 +0200 | [diff] [blame^] | 405 | .unlocked_ioctl = snapshot_ioctl, |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 406 | }; |
| 407 | |
| 408 | static struct miscdevice snapshot_device = { |
| 409 | .minor = SNAPSHOT_MINOR, |
| 410 | .name = "snapshot", |
| 411 | .fops = &snapshot_fops, |
| 412 | }; |
| 413 | |
| 414 | static int __init snapshot_device_init(void) |
| 415 | { |
| 416 | return misc_register(&snapshot_device); |
| 417 | }; |
| 418 | |
| 419 | device_initcall(snapshot_device_init); |