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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Collaborative memory management interface.
4 *
5 * Copyright IBM Corp 2003, 2010
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
7 *
8 */
9
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/gfp.h>
16#include <linux/sched.h>
17#include <linux/string_helpers.h>
18#include <linux/sysctl.h>
19#include <linux/swap.h>
20#include <linux/kthread.h>
21#include <linux/oom.h>
22#include <linux/uaccess.h>
23
24#include <asm/diag.h>
25
26#ifdef CONFIG_CMM_IUCV
27static char *cmm_default_sender = "VMRMSVM";
28#endif
29static char *sender;
30module_param(sender, charp, 0400);
31MODULE_PARM_DESC(sender,
32 "Guest name that may send SMSG messages (default VMRMSVM)");
33
34#include "../../../drivers/s390/net/smsgiucv.h"
35
36#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
37
38struct cmm_page_array {
39 struct cmm_page_array *next;
40 unsigned long index;
41 unsigned long pages[CMM_NR_PAGES];
42};
43
44static long cmm_pages;
45static long cmm_timed_pages;
46static volatile long cmm_pages_target;
47static volatile long cmm_timed_pages_target;
48static long cmm_timeout_pages;
49static long cmm_timeout_seconds;
50
51static struct cmm_page_array *cmm_page_list;
52static struct cmm_page_array *cmm_timed_page_list;
53static DEFINE_SPINLOCK(cmm_lock);
54
55static struct task_struct *cmm_thread_ptr;
56static DECLARE_WAIT_QUEUE_HEAD(cmm_thread_wait);
57
58static void cmm_timer_fn(struct timer_list *);
59static void cmm_set_timer(void);
60static DEFINE_TIMER(cmm_timer, cmm_timer_fn);
61
62static long cmm_alloc_pages(long nr, long *counter,
63 struct cmm_page_array **list)
64{
65 struct cmm_page_array *pa, *npa;
66 unsigned long addr;
67
68 while (nr) {
69 addr = __get_free_page(GFP_NOIO);
70 if (!addr)
71 break;
72 spin_lock(&cmm_lock);
73 pa = *list;
74 if (!pa || pa->index >= CMM_NR_PAGES) {
75 /* Need a new page for the page list. */
76 spin_unlock(&cmm_lock);
77 npa = (struct cmm_page_array *)
78 __get_free_page(GFP_NOIO);
79 if (!npa) {
80 free_page(addr);
81 break;
82 }
83 spin_lock(&cmm_lock);
84 pa = *list;
85 if (!pa || pa->index >= CMM_NR_PAGES) {
86 npa->next = pa;
87 npa->index = 0;
88 pa = npa;
89 *list = pa;
90 } else
91 free_page((unsigned long) npa);
92 }
93 diag10_range(virt_to_pfn((void *)addr), 1);
94 pa->pages[pa->index++] = addr;
95 (*counter)++;
96 spin_unlock(&cmm_lock);
97 nr--;
98 }
99 return nr;
100}
101
102static long cmm_free_pages(long nr, long *counter, struct cmm_page_array **list)
103{
104 struct cmm_page_array *pa;
105 unsigned long addr;
106
107 spin_lock(&cmm_lock);
108 pa = *list;
109 while (nr) {
110 if (!pa || pa->index <= 0)
111 break;
112 addr = pa->pages[--pa->index];
113 if (pa->index == 0) {
114 pa = pa->next;
115 free_page((unsigned long) *list);
116 *list = pa;
117 }
118 free_page(addr);
119 (*counter)--;
120 nr--;
121 }
122 spin_unlock(&cmm_lock);
123 return nr;
124}
125
126static int cmm_oom_notify(struct notifier_block *self,
127 unsigned long dummy, void *parm)
128{
129 unsigned long *freed = parm;
130 long nr = 256;
131
132 nr = cmm_free_pages(nr, &cmm_timed_pages, &cmm_timed_page_list);
133 if (nr > 0)
134 nr = cmm_free_pages(nr, &cmm_pages, &cmm_page_list);
135 cmm_pages_target = cmm_pages;
136 cmm_timed_pages_target = cmm_timed_pages;
137 *freed += 256 - nr;
138 return NOTIFY_OK;
139}
140
141static struct notifier_block cmm_oom_nb = {
142 .notifier_call = cmm_oom_notify,
143};
144
145static int cmm_thread(void *dummy)
146{
147 int rc;
148
149 while (1) {
150 rc = wait_event_interruptible(cmm_thread_wait,
151 cmm_pages != cmm_pages_target ||
152 cmm_timed_pages != cmm_timed_pages_target ||
153 kthread_should_stop());
154 if (kthread_should_stop() || rc == -ERESTARTSYS) {
155 cmm_pages_target = cmm_pages;
156 cmm_timed_pages_target = cmm_timed_pages;
157 break;
158 }
159 if (cmm_pages_target > cmm_pages) {
160 if (cmm_alloc_pages(1, &cmm_pages, &cmm_page_list))
161 cmm_pages_target = cmm_pages;
162 } else if (cmm_pages_target < cmm_pages) {
163 cmm_free_pages(1, &cmm_pages, &cmm_page_list);
164 }
165 if (cmm_timed_pages_target > cmm_timed_pages) {
166 if (cmm_alloc_pages(1, &cmm_timed_pages,
167 &cmm_timed_page_list))
168 cmm_timed_pages_target = cmm_timed_pages;
169 } else if (cmm_timed_pages_target < cmm_timed_pages) {
170 cmm_free_pages(1, &cmm_timed_pages,
171 &cmm_timed_page_list);
172 }
173 if (cmm_timed_pages > 0 && !timer_pending(&cmm_timer))
174 cmm_set_timer();
175 }
176 return 0;
177}
178
179static void cmm_kick_thread(void)
180{
181 wake_up(&cmm_thread_wait);
182}
183
184static void cmm_set_timer(void)
185{
186 if (cmm_timed_pages_target <= 0 || cmm_timeout_seconds <= 0) {
187 if (timer_pending(&cmm_timer))
188 del_timer(&cmm_timer);
189 return;
190 }
191 mod_timer(&cmm_timer, jiffies + msecs_to_jiffies(cmm_timeout_seconds * MSEC_PER_SEC));
192}
193
194static void cmm_timer_fn(struct timer_list *unused)
195{
196 long nr;
197
198 nr = cmm_timed_pages_target - cmm_timeout_pages;
199 if (nr < 0)
200 cmm_timed_pages_target = 0;
201 else
202 cmm_timed_pages_target = nr;
203 cmm_kick_thread();
204 cmm_set_timer();
205}
206
207static void cmm_set_pages(long nr)
208{
209 cmm_pages_target = nr;
210 cmm_kick_thread();
211}
212
213static long cmm_get_pages(void)
214{
215 return cmm_pages;
216}
217
218static void cmm_add_timed_pages(long nr)
219{
220 cmm_timed_pages_target += nr;
221 cmm_kick_thread();
222}
223
224static long cmm_get_timed_pages(void)
225{
226 return cmm_timed_pages;
227}
228
229static void cmm_set_timeout(long nr, long seconds)
230{
231 cmm_timeout_pages = nr;
232 cmm_timeout_seconds = seconds;
233 cmm_set_timer();
234}
235
236static int cmm_skip_blanks(char *cp, char **endp)
237{
238 char *str;
239
240 for (str = cp; *str == ' ' || *str == '\t'; str++)
241 ;
242 *endp = str;
243 return str != cp;
244}
245
246static int cmm_pages_handler(struct ctl_table *ctl, int write,
247 void *buffer, size_t *lenp, loff_t *ppos)
248{
249 long nr = cmm_get_pages();
250 struct ctl_table ctl_entry = {
251 .procname = ctl->procname,
252 .data = &nr,
253 .maxlen = sizeof(long),
254 };
255 int rc;
256
257 rc = proc_doulongvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
258 if (rc < 0 || !write)
259 return rc;
260
261 cmm_set_pages(nr);
262 return 0;
263}
264
265static int cmm_timed_pages_handler(struct ctl_table *ctl, int write,
266 void *buffer, size_t *lenp,
267 loff_t *ppos)
268{
269 long nr = cmm_get_timed_pages();
270 struct ctl_table ctl_entry = {
271 .procname = ctl->procname,
272 .data = &nr,
273 .maxlen = sizeof(long),
274 };
275 int rc;
276
277 rc = proc_doulongvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
278 if (rc < 0 || !write)
279 return rc;
280
281 cmm_add_timed_pages(nr);
282 return 0;
283}
284
285static int cmm_timeout_handler(struct ctl_table *ctl, int write,
286 void *buffer, size_t *lenp, loff_t *ppos)
287{
288 char buf[64], *p;
289 long nr, seconds;
290 unsigned int len;
291
292 if (!*lenp || (*ppos && !write)) {
293 *lenp = 0;
294 return 0;
295 }
296
297 if (write) {
298 len = min(*lenp, sizeof(buf));
299 memcpy(buf, buffer, len);
300 buf[len - 1] = '\0';
301 cmm_skip_blanks(buf, &p);
302 nr = simple_strtoul(p, &p, 0);
303 cmm_skip_blanks(p, &p);
304 seconds = simple_strtoul(p, &p, 0);
305 cmm_set_timeout(nr, seconds);
306 *ppos += *lenp;
307 } else {
308 len = sprintf(buf, "%ld %ld\n",
309 cmm_timeout_pages, cmm_timeout_seconds);
310 if (len > *lenp)
311 len = *lenp;
312 memcpy(buffer, buf, len);
313 *lenp = len;
314 *ppos += len;
315 }
316 return 0;
317}
318
319static struct ctl_table cmm_table[] = {
320 {
321 .procname = "cmm_pages",
322 .mode = 0644,
323 .proc_handler = cmm_pages_handler,
324 },
325 {
326 .procname = "cmm_timed_pages",
327 .mode = 0644,
328 .proc_handler = cmm_timed_pages_handler,
329 },
330 {
331 .procname = "cmm_timeout",
332 .mode = 0644,
333 .proc_handler = cmm_timeout_handler,
334 },
335};
336
337#ifdef CONFIG_CMM_IUCV
338#define SMSG_PREFIX "CMM"
339static void cmm_smsg_target(const char *from, char *msg)
340{
341 long nr, seconds;
342
343 if (strlen(sender) > 0 && strcmp(from, sender) != 0)
344 return;
345 if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
346 return;
347 if (strncmp(msg, "SHRINK", 6) == 0) {
348 if (!cmm_skip_blanks(msg + 6, &msg))
349 return;
350 nr = simple_strtoul(msg, &msg, 0);
351 cmm_skip_blanks(msg, &msg);
352 if (*msg == '\0')
353 cmm_set_pages(nr);
354 } else if (strncmp(msg, "RELEASE", 7) == 0) {
355 if (!cmm_skip_blanks(msg + 7, &msg))
356 return;
357 nr = simple_strtoul(msg, &msg, 0);
358 cmm_skip_blanks(msg, &msg);
359 if (*msg == '\0')
360 cmm_add_timed_pages(nr);
361 } else if (strncmp(msg, "REUSE", 5) == 0) {
362 if (!cmm_skip_blanks(msg + 5, &msg))
363 return;
364 nr = simple_strtoul(msg, &msg, 0);
365 if (!cmm_skip_blanks(msg, &msg))
366 return;
367 seconds = simple_strtoul(msg, &msg, 0);
368 cmm_skip_blanks(msg, &msg);
369 if (*msg == '\0')
370 cmm_set_timeout(nr, seconds);
371 }
372}
373#endif
374
375static struct ctl_table_header *cmm_sysctl_header;
376
377static int __init cmm_init(void)
378{
379 int rc = -ENOMEM;
380
381 cmm_sysctl_header = register_sysctl("vm", cmm_table);
382 if (!cmm_sysctl_header)
383 goto out_sysctl;
384#ifdef CONFIG_CMM_IUCV
385 /* convert sender to uppercase characters */
386 if (sender)
387 string_upper(sender, sender);
388 else
389 sender = cmm_default_sender;
390
391 rc = smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
392 if (rc < 0)
393 goto out_smsg;
394#endif
395 rc = register_oom_notifier(&cmm_oom_nb);
396 if (rc < 0)
397 goto out_oom_notify;
398 cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread");
399 if (!IS_ERR(cmm_thread_ptr))
400 return 0;
401
402 rc = PTR_ERR(cmm_thread_ptr);
403 unregister_oom_notifier(&cmm_oom_nb);
404out_oom_notify:
405#ifdef CONFIG_CMM_IUCV
406 smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
407out_smsg:
408#endif
409 unregister_sysctl_table(cmm_sysctl_header);
410out_sysctl:
411 del_timer_sync(&cmm_timer);
412 return rc;
413}
414module_init(cmm_init);
415
416static void __exit cmm_exit(void)
417{
418 unregister_sysctl_table(cmm_sysctl_header);
419#ifdef CONFIG_CMM_IUCV
420 smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
421#endif
422 unregister_oom_notifier(&cmm_oom_nb);
423 kthread_stop(cmm_thread_ptr);
424 del_timer_sync(&cmm_timer);
425 cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
426 cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
427}
428module_exit(cmm_exit);
429
430MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Collaborative memory management interface.
4 *
5 * Copyright IBM Corp 2003, 2010
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
7 *
8 */
9
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/gfp.h>
16#include <linux/sched.h>
17#include <linux/sysctl.h>
18#include <linux/ctype.h>
19#include <linux/swap.h>
20#include <linux/kthread.h>
21#include <linux/oom.h>
22#include <linux/suspend.h>
23#include <linux/uaccess.h>
24
25#include <asm/pgalloc.h>
26#include <asm/diag.h>
27
28#ifdef CONFIG_CMM_IUCV
29static char *cmm_default_sender = "VMRMSVM";
30#endif
31static char *sender;
32module_param(sender, charp, 0400);
33MODULE_PARM_DESC(sender,
34 "Guest name that may send SMSG messages (default VMRMSVM)");
35
36#include "../../../drivers/s390/net/smsgiucv.h"
37
38#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
39
40struct cmm_page_array {
41 struct cmm_page_array *next;
42 unsigned long index;
43 unsigned long pages[CMM_NR_PAGES];
44};
45
46static long cmm_pages;
47static long cmm_timed_pages;
48static volatile long cmm_pages_target;
49static volatile long cmm_timed_pages_target;
50static long cmm_timeout_pages;
51static long cmm_timeout_seconds;
52static int cmm_suspended;
53
54static struct cmm_page_array *cmm_page_list;
55static struct cmm_page_array *cmm_timed_page_list;
56static DEFINE_SPINLOCK(cmm_lock);
57
58static struct task_struct *cmm_thread_ptr;
59static DECLARE_WAIT_QUEUE_HEAD(cmm_thread_wait);
60
61static void cmm_timer_fn(struct timer_list *);
62static void cmm_set_timer(void);
63static DEFINE_TIMER(cmm_timer, cmm_timer_fn);
64
65static long cmm_alloc_pages(long nr, long *counter,
66 struct cmm_page_array **list)
67{
68 struct cmm_page_array *pa, *npa;
69 unsigned long addr;
70
71 while (nr) {
72 addr = __get_free_page(GFP_NOIO);
73 if (!addr)
74 break;
75 spin_lock(&cmm_lock);
76 pa = *list;
77 if (!pa || pa->index >= CMM_NR_PAGES) {
78 /* Need a new page for the page list. */
79 spin_unlock(&cmm_lock);
80 npa = (struct cmm_page_array *)
81 __get_free_page(GFP_NOIO);
82 if (!npa) {
83 free_page(addr);
84 break;
85 }
86 spin_lock(&cmm_lock);
87 pa = *list;
88 if (!pa || pa->index >= CMM_NR_PAGES) {
89 npa->next = pa;
90 npa->index = 0;
91 pa = npa;
92 *list = pa;
93 } else
94 free_page((unsigned long) npa);
95 }
96 diag10_range(addr >> PAGE_SHIFT, 1);
97 pa->pages[pa->index++] = addr;
98 (*counter)++;
99 spin_unlock(&cmm_lock);
100 nr--;
101 }
102 return nr;
103}
104
105static long cmm_free_pages(long nr, long *counter, struct cmm_page_array **list)
106{
107 struct cmm_page_array *pa;
108 unsigned long addr;
109
110 spin_lock(&cmm_lock);
111 pa = *list;
112 while (nr) {
113 if (!pa || pa->index <= 0)
114 break;
115 addr = pa->pages[--pa->index];
116 if (pa->index == 0) {
117 pa = pa->next;
118 free_page((unsigned long) *list);
119 *list = pa;
120 }
121 free_page(addr);
122 (*counter)--;
123 nr--;
124 }
125 spin_unlock(&cmm_lock);
126 return nr;
127}
128
129static int cmm_oom_notify(struct notifier_block *self,
130 unsigned long dummy, void *parm)
131{
132 unsigned long *freed = parm;
133 long nr = 256;
134
135 nr = cmm_free_pages(nr, &cmm_timed_pages, &cmm_timed_page_list);
136 if (nr > 0)
137 nr = cmm_free_pages(nr, &cmm_pages, &cmm_page_list);
138 cmm_pages_target = cmm_pages;
139 cmm_timed_pages_target = cmm_timed_pages;
140 *freed += 256 - nr;
141 return NOTIFY_OK;
142}
143
144static struct notifier_block cmm_oom_nb = {
145 .notifier_call = cmm_oom_notify,
146};
147
148static int cmm_thread(void *dummy)
149{
150 int rc;
151
152 while (1) {
153 rc = wait_event_interruptible(cmm_thread_wait,
154 (!cmm_suspended && (cmm_pages != cmm_pages_target ||
155 cmm_timed_pages != cmm_timed_pages_target)) ||
156 kthread_should_stop());
157 if (kthread_should_stop() || rc == -ERESTARTSYS) {
158 cmm_pages_target = cmm_pages;
159 cmm_timed_pages_target = cmm_timed_pages;
160 break;
161 }
162 if (cmm_pages_target > cmm_pages) {
163 if (cmm_alloc_pages(1, &cmm_pages, &cmm_page_list))
164 cmm_pages_target = cmm_pages;
165 } else if (cmm_pages_target < cmm_pages) {
166 cmm_free_pages(1, &cmm_pages, &cmm_page_list);
167 }
168 if (cmm_timed_pages_target > cmm_timed_pages) {
169 if (cmm_alloc_pages(1, &cmm_timed_pages,
170 &cmm_timed_page_list))
171 cmm_timed_pages_target = cmm_timed_pages;
172 } else if (cmm_timed_pages_target < cmm_timed_pages) {
173 cmm_free_pages(1, &cmm_timed_pages,
174 &cmm_timed_page_list);
175 }
176 if (cmm_timed_pages > 0 && !timer_pending(&cmm_timer))
177 cmm_set_timer();
178 }
179 return 0;
180}
181
182static void cmm_kick_thread(void)
183{
184 wake_up(&cmm_thread_wait);
185}
186
187static void cmm_set_timer(void)
188{
189 if (cmm_timed_pages_target <= 0 || cmm_timeout_seconds <= 0) {
190 if (timer_pending(&cmm_timer))
191 del_timer(&cmm_timer);
192 return;
193 }
194 if (timer_pending(&cmm_timer)) {
195 if (mod_timer(&cmm_timer, jiffies + cmm_timeout_seconds*HZ))
196 return;
197 }
198 cmm_timer.expires = jiffies + cmm_timeout_seconds*HZ;
199 add_timer(&cmm_timer);
200}
201
202static void cmm_timer_fn(struct timer_list *unused)
203{
204 long nr;
205
206 nr = cmm_timed_pages_target - cmm_timeout_pages;
207 if (nr < 0)
208 cmm_timed_pages_target = 0;
209 else
210 cmm_timed_pages_target = nr;
211 cmm_kick_thread();
212 cmm_set_timer();
213}
214
215static void cmm_set_pages(long nr)
216{
217 cmm_pages_target = nr;
218 cmm_kick_thread();
219}
220
221static long cmm_get_pages(void)
222{
223 return cmm_pages;
224}
225
226static void cmm_add_timed_pages(long nr)
227{
228 cmm_timed_pages_target += nr;
229 cmm_kick_thread();
230}
231
232static long cmm_get_timed_pages(void)
233{
234 return cmm_timed_pages;
235}
236
237static void cmm_set_timeout(long nr, long seconds)
238{
239 cmm_timeout_pages = nr;
240 cmm_timeout_seconds = seconds;
241 cmm_set_timer();
242}
243
244static int cmm_skip_blanks(char *cp, char **endp)
245{
246 char *str;
247
248 for (str = cp; *str == ' ' || *str == '\t'; str++)
249 ;
250 *endp = str;
251 return str != cp;
252}
253
254static struct ctl_table cmm_table[];
255
256static int cmm_pages_handler(struct ctl_table *ctl, int write,
257 void __user *buffer, size_t *lenp, loff_t *ppos)
258{
259 char buf[16], *p;
260 unsigned int len;
261 long nr;
262
263 if (!*lenp || (*ppos && !write)) {
264 *lenp = 0;
265 return 0;
266 }
267
268 if (write) {
269 len = *lenp;
270 if (copy_from_user(buf, buffer,
271 len > sizeof(buf) ? sizeof(buf) : len))
272 return -EFAULT;
273 buf[sizeof(buf) - 1] = '\0';
274 cmm_skip_blanks(buf, &p);
275 nr = simple_strtoul(p, &p, 0);
276 if (ctl == &cmm_table[0])
277 cmm_set_pages(nr);
278 else
279 cmm_add_timed_pages(nr);
280 } else {
281 if (ctl == &cmm_table[0])
282 nr = cmm_get_pages();
283 else
284 nr = cmm_get_timed_pages();
285 len = sprintf(buf, "%ld\n", nr);
286 if (len > *lenp)
287 len = *lenp;
288 if (copy_to_user(buffer, buf, len))
289 return -EFAULT;
290 }
291 *lenp = len;
292 *ppos += len;
293 return 0;
294}
295
296static int cmm_timeout_handler(struct ctl_table *ctl, int write,
297 void __user *buffer, size_t *lenp, loff_t *ppos)
298{
299 char buf[64], *p;
300 long nr, seconds;
301 unsigned int len;
302
303 if (!*lenp || (*ppos && !write)) {
304 *lenp = 0;
305 return 0;
306 }
307
308 if (write) {
309 len = *lenp;
310 if (copy_from_user(buf, buffer,
311 len > sizeof(buf) ? sizeof(buf) : len))
312 return -EFAULT;
313 buf[sizeof(buf) - 1] = '\0';
314 cmm_skip_blanks(buf, &p);
315 nr = simple_strtoul(p, &p, 0);
316 cmm_skip_blanks(p, &p);
317 seconds = simple_strtoul(p, &p, 0);
318 cmm_set_timeout(nr, seconds);
319 } else {
320 len = sprintf(buf, "%ld %ld\n",
321 cmm_timeout_pages, cmm_timeout_seconds);
322 if (len > *lenp)
323 len = *lenp;
324 if (copy_to_user(buffer, buf, len))
325 return -EFAULT;
326 }
327 *lenp = len;
328 *ppos += len;
329 return 0;
330}
331
332static struct ctl_table cmm_table[] = {
333 {
334 .procname = "cmm_pages",
335 .mode = 0644,
336 .proc_handler = cmm_pages_handler,
337 },
338 {
339 .procname = "cmm_timed_pages",
340 .mode = 0644,
341 .proc_handler = cmm_pages_handler,
342 },
343 {
344 .procname = "cmm_timeout",
345 .mode = 0644,
346 .proc_handler = cmm_timeout_handler,
347 },
348 { }
349};
350
351static struct ctl_table cmm_dir_table[] = {
352 {
353 .procname = "vm",
354 .maxlen = 0,
355 .mode = 0555,
356 .child = cmm_table,
357 },
358 { }
359};
360
361#ifdef CONFIG_CMM_IUCV
362#define SMSG_PREFIX "CMM"
363static void cmm_smsg_target(const char *from, char *msg)
364{
365 long nr, seconds;
366
367 if (strlen(sender) > 0 && strcmp(from, sender) != 0)
368 return;
369 if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
370 return;
371 if (strncmp(msg, "SHRINK", 6) == 0) {
372 if (!cmm_skip_blanks(msg + 6, &msg))
373 return;
374 nr = simple_strtoul(msg, &msg, 0);
375 cmm_skip_blanks(msg, &msg);
376 if (*msg == '\0')
377 cmm_set_pages(nr);
378 } else if (strncmp(msg, "RELEASE", 7) == 0) {
379 if (!cmm_skip_blanks(msg + 7, &msg))
380 return;
381 nr = simple_strtoul(msg, &msg, 0);
382 cmm_skip_blanks(msg, &msg);
383 if (*msg == '\0')
384 cmm_add_timed_pages(nr);
385 } else if (strncmp(msg, "REUSE", 5) == 0) {
386 if (!cmm_skip_blanks(msg + 5, &msg))
387 return;
388 nr = simple_strtoul(msg, &msg, 0);
389 if (!cmm_skip_blanks(msg, &msg))
390 return;
391 seconds = simple_strtoul(msg, &msg, 0);
392 cmm_skip_blanks(msg, &msg);
393 if (*msg == '\0')
394 cmm_set_timeout(nr, seconds);
395 }
396}
397#endif
398
399static struct ctl_table_header *cmm_sysctl_header;
400
401static int cmm_suspend(void)
402{
403 cmm_suspended = 1;
404 cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
405 cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
406 return 0;
407}
408
409static int cmm_resume(void)
410{
411 cmm_suspended = 0;
412 cmm_kick_thread();
413 return 0;
414}
415
416static int cmm_power_event(struct notifier_block *this,
417 unsigned long event, void *ptr)
418{
419 switch (event) {
420 case PM_POST_HIBERNATION:
421 return cmm_resume();
422 case PM_HIBERNATION_PREPARE:
423 return cmm_suspend();
424 default:
425 return NOTIFY_DONE;
426 }
427}
428
429static struct notifier_block cmm_power_notifier = {
430 .notifier_call = cmm_power_event,
431};
432
433static int __init cmm_init(void)
434{
435 int rc = -ENOMEM;
436
437 cmm_sysctl_header = register_sysctl_table(cmm_dir_table);
438 if (!cmm_sysctl_header)
439 goto out_sysctl;
440#ifdef CONFIG_CMM_IUCV
441 /* convert sender to uppercase characters */
442 if (sender) {
443 int len = strlen(sender);
444 while (len--)
445 sender[len] = toupper(sender[len]);
446 } else {
447 sender = cmm_default_sender;
448 }
449
450 rc = smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
451 if (rc < 0)
452 goto out_smsg;
453#endif
454 rc = register_oom_notifier(&cmm_oom_nb);
455 if (rc < 0)
456 goto out_oom_notify;
457 rc = register_pm_notifier(&cmm_power_notifier);
458 if (rc)
459 goto out_pm;
460 cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread");
461 if (!IS_ERR(cmm_thread_ptr))
462 return 0;
463
464 rc = PTR_ERR(cmm_thread_ptr);
465 unregister_pm_notifier(&cmm_power_notifier);
466out_pm:
467 unregister_oom_notifier(&cmm_oom_nb);
468out_oom_notify:
469#ifdef CONFIG_CMM_IUCV
470 smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
471out_smsg:
472#endif
473 unregister_sysctl_table(cmm_sysctl_header);
474out_sysctl:
475 del_timer_sync(&cmm_timer);
476 return rc;
477}
478module_init(cmm_init);
479
480static void __exit cmm_exit(void)
481{
482 unregister_sysctl_table(cmm_sysctl_header);
483#ifdef CONFIG_CMM_IUCV
484 smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
485#endif
486 unregister_pm_notifier(&cmm_power_notifier);
487 unregister_oom_notifier(&cmm_oom_nb);
488 kthread_stop(cmm_thread_ptr);
489 del_timer_sync(&cmm_timer);
490 cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
491 cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
492}
493module_exit(cmm_exit);
494
495MODULE_LICENSE("GPL");