2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) Samsung Electronics, 2015
18 * 2015 Vyacheslav Cherkashin <v.cherkashin@samsung.com>
23 #include <linux/slab.h>
24 #include <linux/list.h>
25 #include <linux/mutex.h>
26 #include <linux/types.h>
27 #include <linux/spinlock.h>
28 #include "swap_initializer.h"
36 static swap_init_t sis_get_fn_init(struct swap_init_struct *init,
37 enum init_level level)
41 return init->core_init;
49 static swap_uninit_t sis_get_fn_uninit(struct swap_init_struct *init,
50 enum init_level level)
54 return init->core_uninit;
56 return init->fs_uninit;
62 static void sis_set_flag(struct swap_init_struct *init,
63 enum init_level level, bool val)
67 init->core_flag = val;
75 static bool sis_get_flag(struct swap_init_struct *init, enum init_level level)
79 return init->core_flag;
87 static int sis_once(struct swap_init_struct *init)
92 if (!init->once_flag && once) {
99 init->once_flag = true;
105 static int sis_init_level(struct swap_init_struct *init, enum init_level level)
110 if (sis_get_flag(init, level))
113 fn = sis_get_fn_init(init, level);
120 sis_set_flag(init, level, true);
124 static void sis_uninit_level(struct swap_init_struct *init,
125 enum init_level level)
127 if (sis_get_flag(init, level)) {
128 swap_uninit_t fn = sis_get_fn_uninit(init, level);
131 sis_set_flag(init, level, false);
135 static int sis_init(struct swap_init_struct *init)
139 ret = sis_once(init);
143 ret = sis_init_level(init, IL_CORE);
147 ret = sis_init_level(init, IL_FS);
149 sis_uninit_level(init, IL_CORE);
154 static void sis_uninit(struct swap_init_struct *init)
156 sis_uninit_level(init, IL_FS);
157 sis_uninit_level(init, IL_CORE);
160 static LIST_HEAD(init_list);
161 static DEFINE_MUTEX(inst_mutex);
162 static unsigned init_flag;
164 static int do_once(void)
167 struct swap_init_struct *init;
169 list_for_each_entry(init, &init_list, list) {
170 ret = sis_once(init);
178 static void do_uninit_level(enum init_level level)
180 struct swap_init_struct *init;
182 list_for_each_entry_reverse(init, &init_list, list)
183 sis_uninit_level(init, level);
186 static int do_init_level(enum init_level level)
189 struct swap_init_struct *init;
191 list_for_each_entry(init, &init_list, list) {
192 ret = sis_init_level(init, level);
194 do_uninit_level(level);
202 static int do_init(void)
210 ret = do_init_level(IL_CORE);
214 ret = do_init_level(IL_FS);
216 do_uninit_level(IL_CORE);
223 static void do_uninit(void)
225 do_uninit_level(IL_FS);
226 do_uninit_level(IL_CORE);
232 static atomic_t init_use = ATOMIC_INIT(0);
240 static enum init_stat_t init_stat;
241 static DEFINE_SPINLOCK(init_stat_lock);
244 static bool swap_init_try_get(void)
246 spin_lock(&init_stat_lock);
247 if (init_stat != IS_ON) {
248 spin_unlock(&init_stat_lock);
251 spin_unlock(&init_stat_lock);
253 atomic_inc(&init_use);
258 static void swap_init_put(void)
260 atomic_dec(&init_use);
263 int swap_init_simple_open(struct inode *inode, struct file *file)
265 if (swap_init_try_get() == false)
270 EXPORT_SYMBOL_GPL(swap_init_simple_open);
272 int swap_init_simple_release(struct inode *inode, struct file *file)
277 EXPORT_SYMBOL_GPL(swap_init_simple_release);
279 int swap_init_init(void)
283 spin_lock(&init_stat_lock);
284 init_stat = IS_SWITCHING;
285 spin_unlock(&init_stat_lock);
289 spin_lock(&init_stat_lock);
290 init_stat = ret ? IS_OFF : IS_ON;
291 spin_unlock(&init_stat_lock);
296 int swap_init_uninit(void)
298 spin_lock(&init_stat_lock);
299 init_stat = IS_SWITCHING;
300 if (atomic_read(&init_use)) {
302 spin_unlock(&init_stat_lock);
305 spin_unlock(&init_stat_lock);
309 spin_lock(&init_stat_lock);
311 spin_unlock(&init_stat_lock);
317 int swap_init_stat_get(void)
319 mutex_lock(&inst_mutex);
324 void swap_init_stat_put(void)
326 mutex_unlock(&inst_mutex);
329 int swap_init_register(struct swap_init_struct *init)
333 mutex_lock(&inst_mutex);
335 ret = sis_init(init);
338 list_add_tail(&init->list, &init_list);
339 mutex_unlock(&inst_mutex);
343 EXPORT_SYMBOL_GPL(swap_init_register);
345 void swap_init_unregister(struct swap_init_struct *init)
347 mutex_lock(&inst_mutex);
348 list_del(&init->list);
350 mutex_unlock(&inst_mutex);
352 EXPORT_SYMBOL_GPL(swap_init_unregister);