[mirror_ubuntu-hirsute-kernel.git] / arch / s390 / mm / cmm.c

/*
 *  arch/s390/mm/cmm.c
 *
 *  S390 version
 *    Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Collaborative memory management interface.
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/sysctl.h>
#include <linux/ctype.h>

#include <asm/pgalloc.h>
#include <asm/uaccess.h>

static char *sender = "VMRMSVM";
module_param(sender, charp, 0400);
MODULE_PARM_DESC(sender,
		 "Guest name that may send SMSG messages (default VMRMSVM)");

#include "../../../drivers/s390/net/smsgiucv.h"

#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)

struct cmm_page_array {
	struct cmm_page_array *next;
	unsigned long index;
	unsigned long pages[CMM_NR_PAGES];
};

static long cmm_pages = 0;
static long cmm_timed_pages = 0;
static volatile long cmm_pages_target = 0;
static volatile long cmm_timed_pages_target = 0;
static long cmm_timeout_pages = 0;
static long cmm_timeout_seconds = 0;

static struct cmm_page_array *cmm_page_list = NULL;
static struct cmm_page_array *cmm_timed_page_list = NULL;

static unsigned long cmm_thread_active = 0;
static struct work_struct cmm_thread_starter;
static wait_queue_head_t cmm_thread_wait;
static struct timer_list cmm_timer;

static void cmm_timer_fn(unsigned long);
static void cmm_set_timer(void);

static long
cmm_strtoul(const char *cp, char **endp)
{
	unsigned int base = 10;

	if (*cp == '0') {
		base = 8;
		cp++;
		if ((*cp == 'x' || *cp == 'X') && isxdigit(cp[1])) {
			base = 16;
			cp++;
		}
	}
	return simple_strtoul(cp, endp, base);
}

static long
cmm_alloc_pages(long pages, long *counter, struct cmm_page_array **list)
{
	struct cmm_page_array *pa;
	unsigned long page;

	pa = *list;
	while (pages) {
		page = __get_free_page(GFP_NOIO);
		if (!page)
			break;
		if (!pa || pa->index >= CMM_NR_PAGES) {
			/* Need a new page for the page list. */
			pa = (struct cmm_page_array *)
				__get_free_page(GFP_NOIO);
			if (!pa) {
				free_page(page);
				break;
			}
			pa->next = *list;
			pa->index = 0;
			*list = pa;
		}
		diag10(page);
		pa->pages[pa->index++] = page;
		(*counter)++;
		pages--;
	}
	return pages;
}

static void
cmm_free_pages(long pages, long *counter, struct cmm_page_array **list)
{
	struct cmm_page_array *pa;
	unsigned long page;

	pa = *list;
	while (pages) {
		if (!pa || pa->index <= 0)
			break;
		page = pa->pages[--pa->index];
		if (pa->index == 0) {
			pa = pa->next;
			free_page((unsigned long) *list);
			*list = pa;
		}
		free_page(page);
		(*counter)--;
		pages--;
	}
}

static int
cmm_thread(void *dummy)
{
	int rc;

	daemonize("cmmthread");
	while (1) {
		rc = wait_event_interruptible(cmm_thread_wait,
			(cmm_pages != cmm_pages_target ||
			 cmm_timed_pages != cmm_timed_pages_target));
		if (rc == -ERESTARTSYS) {
			/* Got kill signal. End thread. */
			clear_bit(0, &cmm_thread_active);
			cmm_pages_target = cmm_pages;
			cmm_timed_pages_target = cmm_timed_pages;
			break;
		}
		if (cmm_pages_target > cmm_pages) {
			if (cmm_alloc_pages(1, &cmm_pages, &cmm_page_list))
				cmm_pages_target = cmm_pages;
		} else if (cmm_pages_target < cmm_pages) {
			cmm_free_pages(1, &cmm_pages, &cmm_page_list);
		}
		if (cmm_timed_pages_target > cmm_timed_pages) {
			if (cmm_alloc_pages(1, &cmm_timed_pages,
					   &cmm_timed_page_list))
				cmm_timed_pages_target = cmm_timed_pages;
		} else if (cmm_timed_pages_target < cmm_timed_pages) {
			cmm_free_pages(1, &cmm_timed_pages,
			       	       &cmm_timed_page_list);
		}
		if (cmm_timed_pages > 0 && !timer_pending(&cmm_timer))
			cmm_set_timer();
	}
	return 0;
}

static void
cmm_start_thread(void)
{
	kernel_thread(cmm_thread, 0, 0);
}

static void
cmm_kick_thread(void)
{
	if (!test_and_set_bit(0, &cmm_thread_active))
		schedule_work(&cmm_thread_starter);
	wake_up(&cmm_thread_wait);
}

static void
cmm_set_timer(void)
{
	if (cmm_timed_pages_target <= 0 || cmm_timeout_seconds <= 0) {
		if (timer_pending(&cmm_timer))
			del_timer(&cmm_timer);
		return;
	}
	if (timer_pending(&cmm_timer)) {
		if (mod_timer(&cmm_timer, jiffies + cmm_timeout_seconds*HZ))
			return;
	}
	cmm_timer.function = cmm_timer_fn;
	cmm_timer.data = 0;
	cmm_timer.expires = jiffies + cmm_timeout_seconds*HZ;
	add_timer(&cmm_timer);
}

static void
cmm_timer_fn(unsigned long ignored)
{
	long pages;

	pages = cmm_timed_pages_target - cmm_timeout_pages;
	if (pages < 0)
		cmm_timed_pages_target = 0;
	else
		cmm_timed_pages_target = pages;
	cmm_kick_thread();
	cmm_set_timer();
}

void
cmm_set_pages(long pages)
{
	cmm_pages_target = pages;
	cmm_kick_thread();
}

long
cmm_get_pages(void)
{
	return cmm_pages;
}

void
cmm_add_timed_pages(long pages)
{
	cmm_timed_pages_target += pages;
	cmm_kick_thread();
}

long
cmm_get_timed_pages(void)
{
	return cmm_timed_pages;
}

void
cmm_set_timeout(long pages, long seconds)
{
	cmm_timeout_pages = pages;
	cmm_timeout_seconds = seconds;
	cmm_set_timer();
}

static inline int
cmm_skip_blanks(char *cp, char **endp)
{
	char *str;

	for (str = cp; *str == ' ' || *str == '\t'; str++);
	*endp = str;
	return str != cp;
}

#ifdef CONFIG_CMM_PROC
/* These will someday get removed. */
#define VM_CMM_PAGES		1111
#define VM_CMM_TIMED_PAGES	1112
#define VM_CMM_TIMEOUT		1113

static struct ctl_table cmm_table[];

static int
cmm_pages_handler(ctl_table *ctl, int write, struct file *filp,
		  void __user *buffer, size_t *lenp, loff_t *ppos)
{
	char buf[16], *p;
	long pages;
	int len;

	if (!*lenp || (*ppos && !write)) {
		*lenp = 0;
		return 0;
	}

	if (write) {
		len = *lenp;
		if (copy_from_user(buf, buffer,
				   len > sizeof(buf) ? sizeof(buf) : len))
			return -EFAULT;
		buf[sizeof(buf) - 1] = '\0';
		cmm_skip_blanks(buf, &p);
		pages = cmm_strtoul(p, &p);
		if (ctl == &cmm_table[0])
			cmm_set_pages(pages);
		else
			cmm_add_timed_pages(pages);
	} else {
		if (ctl == &cmm_table[0])
			pages = cmm_get_pages();
		else
			pages = cmm_get_timed_pages();
		len = sprintf(buf, "%ld\n", pages);
		if (len > *lenp)
			len = *lenp;
		if (copy_to_user(buffer, buf, len))
			return -EFAULT;
	}
	*lenp = len;
	*ppos += len;
	return 0;
}

static int
cmm_timeout_handler(ctl_table *ctl, int write, struct file *filp,
		    void __user *buffer, size_t *lenp, loff_t *ppos)
{
	char buf[64], *p;
	long pages, seconds;
	int len;

	if (!*lenp || (*ppos && !write)) {
		*lenp = 0;
		return 0;
	}

	if (write) {
		len = *lenp;
		if (copy_from_user(buf, buffer,
				   len > sizeof(buf) ? sizeof(buf) : len))
			return -EFAULT;
		buf[sizeof(buf) - 1] = '\0';
		cmm_skip_blanks(buf, &p);
		pages = cmm_strtoul(p, &p);
		cmm_skip_blanks(p, &p);
		seconds = cmm_strtoul(p, &p);
		cmm_set_timeout(pages, seconds);
	} else {
		len = sprintf(buf, "%ld %ld\n",
			      cmm_timeout_pages, cmm_timeout_seconds);
		if (len > *lenp)
			len = *lenp;
		if (copy_to_user(buffer, buf, len))
			return -EFAULT;
	}
	*lenp = len;
	*ppos += len;
	return 0;
}

static struct ctl_table cmm_table[] = {
	{
		.ctl_name	= VM_CMM_PAGES,
		.procname	= "cmm_pages",
		.mode		= 0600,
		.proc_handler	= &cmm_pages_handler,
	},
	{
		.ctl_name	= VM_CMM_TIMED_PAGES,
		.procname	= "cmm_timed_pages",
		.mode		= 0600,
		.proc_handler	= &cmm_pages_handler,
	},
	{
		.ctl_name	= VM_CMM_TIMEOUT,
		.procname	= "cmm_timeout",
		.mode		= 0600,
		.proc_handler	= &cmm_timeout_handler,
	},
	{ .ctl_name = 0 }
};

static struct ctl_table cmm_dir_table[] = {
	{
		.ctl_name	= CTL_VM,
		.procname	= "vm",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= cmm_table,
	},
	{ .ctl_name = 0 }
};
#endif

#ifdef CONFIG_CMM_IUCV
#define SMSG_PREFIX "CMM"
static void
cmm_smsg_target(char *from, char *msg)
{
	long pages, seconds;

	if (strlen(sender) > 0 && strcmp(from, sender) != 0)
		return;
	if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
		return;
	if (strncmp(msg, "SHRINK", 6) == 0) {
		if (!cmm_skip_blanks(msg + 6, &msg))
			return;
		pages = cmm_strtoul(msg, &msg);
		cmm_skip_blanks(msg, &msg);
		if (*msg == '\0')
			cmm_set_pages(pages);
	} else if (strncmp(msg, "RELEASE", 7) == 0) {
		if (!cmm_skip_blanks(msg + 7, &msg))
			return;
		pages = cmm_strtoul(msg, &msg);
		cmm_skip_blanks(msg, &msg);
		if (*msg == '\0')
			cmm_add_timed_pages(pages);
	} else if (strncmp(msg, "REUSE", 5) == 0) {
		if (!cmm_skip_blanks(msg + 5, &msg))
			return;
		pages = cmm_strtoul(msg, &msg);
		if (!cmm_skip_blanks(msg, &msg))
			return;
		seconds = cmm_strtoul(msg, &msg);
		cmm_skip_blanks(msg, &msg);
		if (*msg == '\0')
			cmm_set_timeout(pages, seconds);
	}
}
#endif

struct ctl_table_header *cmm_sysctl_header;

static int
cmm_init (void)
{
#ifdef CONFIG_CMM_PROC
	cmm_sysctl_header = register_sysctl_table(cmm_dir_table, 1);
#endif
#ifdef CONFIG_CMM_IUCV
	smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
#endif
	INIT_WORK(&cmm_thread_starter, (void *) cmm_start_thread, NULL);
	init_waitqueue_head(&cmm_thread_wait);
	init_timer(&cmm_timer);
	return 0;
}

static void
cmm_exit(void)
{
	cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
	cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
#ifdef CONFIG_CMM_PROC
	unregister_sysctl_table(cmm_sysctl_header);
#endif
#ifdef CONFIG_CMM_IUCV
	smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
#endif
}

module_init(cmm_init);
module_exit(cmm_exit);

EXPORT_SYMBOL(cmm_set_pages);
EXPORT_SYMBOL(cmm_get_pages);
EXPORT_SYMBOL(cmm_add_timed_pages);
EXPORT_SYMBOL(cmm_get_timed_pages);
EXPORT_SYMBOL(cmm_set_timeout);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/s390/mm/cmm.c
	3	*
	4	* S390 version
	5	* Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
	7	*
	8	* Collaborative memory management interface.
	9	*/
	10
	11	#include <linux/config.h>
	12	#include <linux/errno.h>
	13	#include <linux/fs.h>
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/sched.h>
	17	#include <linux/sysctl.h>
	18	#include <linux/ctype.h>
	19
	20	#include <asm/pgalloc.h>
	21	#include <asm/uaccess.h>
	22
15439d74	23	static char *sender = "VMRMSVM";
447570cf	24	module_param(sender, charp, 0400);
15439d74 MS	25	MODULE_PARM_DESC(sender,
	26	"Guest name that may send SMSG messages (default VMRMSVM)");
	27
1da177e4 LT	28	#include "../../../drivers/s390/net/smsgiucv.h"
	29
	30	#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
	31
	32	struct cmm_page_array {
	33	struct cmm_page_array *next;
	34	unsigned long index;
	35	unsigned long pages[CMM_NR_PAGES];
	36	};
	37
	38	static long cmm_pages = 0;
	39	static long cmm_timed_pages = 0;
	40	static volatile long cmm_pages_target = 0;
	41	static volatile long cmm_timed_pages_target = 0;
	42	static long cmm_timeout_pages = 0;
	43	static long cmm_timeout_seconds = 0;
	44
aaedd944 AV	45	static struct cmm_page_array *cmm_page_list = NULL;
aaedd944 AV	46	static struct cmm_page_array *cmm_timed_page_list = NULL;
1da177e4 LT	47
	48	static unsigned long cmm_thread_active = 0;
	49	static struct work_struct cmm_thread_starter;
	50	static wait_queue_head_t cmm_thread_wait;
	51	static struct timer_list cmm_timer;
	52
	53	static void cmm_timer_fn(unsigned long);
	54	static void cmm_set_timer(void);
	55
	56	static long
	57	cmm_strtoul(const char cp, char *endp)
	58	{
	59	unsigned int base = 10;
	60
	61	if (*cp == '0') {
	62	base = 8;
	63	cp++;
	64	if ((cp == 'x' \|\| cp == 'X') && isxdigit(cp[1])) {
	65	base = 16;
	66	cp++;
	67	}
	68	}
	69	return simple_strtoul(cp, endp, base);
	70	}
	71
	72	static long
	73	cmm_alloc_pages(long pages, long counter, struct cmm_page_array *list)
	74	{
	75	struct cmm_page_array *pa;
	76	unsigned long page;
	77
	78	pa = *list;
	79	while (pages) {
	80	page = __get_free_page(GFP_NOIO);
	81	if (!page)
	82	break;
	83	if (!pa \|\| pa->index >= CMM_NR_PAGES) {
	84	/* Need a new page for the page list. */
	85	pa = (struct cmm_page_array *)
	86	__get_free_page(GFP_NOIO);
	87	if (!pa) {
	88	free_page(page);
	89	break;
	90	}
	91	pa->next = *list;
	92	pa->index = 0;
	93	*list = pa;
	94	}
	95	diag10(page);
	96	pa->pages[pa->index++] = page;
	97	(*counter)++;
	98	pages--;
	99	}
	100	return pages;
	101	}
	102
	103	static void
	104	cmm_free_pages(long pages, long counter, struct cmm_page_array *list)
	105	{
	106	struct cmm_page_array *pa;
	107	unsigned long page;
	108
	109	pa = *list;
	110	while (pages) {
111	if (!pa \|\| pa->index <= 0)
112	break;
113	page = pa->pages[--pa->index];
114	if (pa->index == 0) {
115	pa = pa->next;
116	free_page((unsigned long) *list);
117	*list = pa;
118	}
119	free_page(page);
120	(*counter)--;
121	pages--;
122	}
123	}
124
125	static int
126	cmm_thread(void *dummy)
127	{
128	int rc;
129
130	daemonize("cmmthread");
131	while (1) {
132	rc = wait_event_interruptible(cmm_thread_wait,
133	(cmm_pages != cmm_pages_target \|\|
134	cmm_timed_pages != cmm_timed_pages_target));
135	if (rc == -ERESTARTSYS) {
136	/* Got kill signal. End thread. */
137	clear_bit(0, &cmm_thread_active);
138	cmm_pages_target = cmm_pages;
139	cmm_timed_pages_target = cmm_timed_pages;
140	break;
141	}
142	if (cmm_pages_target > cmm_pages) {
143	if (cmm_alloc_pages(1, &cmm_pages, &cmm_page_list))
144	cmm_pages_target = cmm_pages;
145	} else if (cmm_pages_target < cmm_pages) {
146	cmm_free_pages(1, &cmm_pages, &cmm_page_list);
147	}
148	if (cmm_timed_pages_target > cmm_timed_pages) {
149	if (cmm_alloc_pages(1, &cmm_timed_pages,
150	&cmm_timed_page_list))
151	cmm_timed_pages_target = cmm_timed_pages;
152	} else if (cmm_timed_pages_target < cmm_timed_pages) {
153	cmm_free_pages(1, &cmm_timed_pages,
154	&cmm_timed_page_list);
155	}
156	if (cmm_timed_pages > 0 && !timer_pending(&cmm_timer))
157	cmm_set_timer();
158	}
159	return 0;
160	}
161
162	static void
163	cmm_start_thread(void)
164	{
165	kernel_thread(cmm_thread, 0, 0);
166	}
167
168	static void
169	cmm_kick_thread(void)
170	{
171	if (!test_and_set_bit(0, &cmm_thread_active))
172	schedule_work(&cmm_thread_starter);
173	wake_up(&cmm_thread_wait);
174	}
175
176	static void
177	cmm_set_timer(void)
178	{
179	if (cmm_timed_pages_target <= 0 \|\| cmm_timeout_seconds <= 0) {
180	if (timer_pending(&cmm_timer))
181	del_timer(&cmm_timer);
182	return;
183	}
184	if (timer_pending(&cmm_timer)) {
185	if (mod_timer(&cmm_timer, jiffies + cmm_timeout_seconds*HZ))
186	return;
187	}
188	cmm_timer.function = cmm_timer_fn;
189	cmm_timer.data = 0;
190	cmm_timer.expires = jiffies + cmm_timeout_seconds*HZ;
191	add_timer(&cmm_timer);
192	}
193
194	static void
195	cmm_timer_fn(unsigned long ignored)
196	{
197	long pages;
198
199	pages = cmm_timed_pages_target - cmm_timeout_pages;
200	if (pages < 0)
201	cmm_timed_pages_target = 0;
202	else
203	cmm_timed_pages_target = pages;
204	cmm_kick_thread();
205	cmm_set_timer();
206	}
207
208	void
209	cmm_set_pages(long pages)
210	{
211	cmm_pages_target = pages;
212	cmm_kick_thread();
213	}
214
215	long
216	cmm_get_pages(void)
217	{
218	return cmm_pages;
219	}
220
221	void
222	cmm_add_timed_pages(long pages)
223	{
224	cmm_timed_pages_target += pages;
225	cmm_kick_thread();
226	}
227
228	long
229	cmm_get_timed_pages(void)
230	{
231	return cmm_timed_pages;
232	}
233
234	void
235	cmm_set_timeout(long pages, long seconds)
236	{
237	cmm_timeout_pages = pages;
238	cmm_timeout_seconds = seconds;
239	cmm_set_timer();
240	}
241
242	static inline int
243	cmm_skip_blanks(char cp, char *endp)
244	{
245	char *str;
246
247	for (str = cp; str == ' ' \|\| str == '\t'; str++);
248	*endp = str;
249	return str != cp;
250	}
251
252	#ifdef CONFIG_CMM_PROC
253	/* These will someday get removed. */
254	#define VM_CMM_PAGES 1111
255	#define VM_CMM_TIMED_PAGES 1112
256	#define VM_CMM_TIMEOUT 1113
257
258	static struct ctl_table cmm_table[];
259
260	static int
261	cmm_pages_handler(ctl_table ctl, int write, struct file filp,
aaedd944	262	void __user buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	263	{
	264	char buf[16], *p;
	265	long pages;
	266	int len;
	267
	268	if (!lenp \|\| (ppos && !write)) {
	269	*lenp = 0;
	270	return 0;
	271	}
	272
	273	if (write) {
	274	len = *lenp;
	275	if (copy_from_user(buf, buffer,
	276	len > sizeof(buf) ? sizeof(buf) : len))
	277	return -EFAULT;
	278	buf[sizeof(buf) - 1] = '\0';
	279	cmm_skip_blanks(buf, &p);
	280	pages = cmm_strtoul(p, &p);
	281	if (ctl == &cmm_table[0])
	282	cmm_set_pages(pages);
	283	else
	284	cmm_add_timed_pages(pages);
	285	} else {
	286	if (ctl == &cmm_table[0])
	287	pages = cmm_get_pages();
	288	else
	289	pages = cmm_get_timed_pages();
	290	len = sprintf(buf, "%ld\n", pages);
	291	if (len > *lenp)
	292	len = *lenp;
	293	if (copy_to_user(buffer, buf, len))
	294	return -EFAULT;
	295	}
	296	*lenp = len;
	297	*ppos += len;
	298	return 0;
	299	}
	300
	301	static int
	302	cmm_timeout_handler(ctl_table ctl, int write, struct file filp,
aaedd944	303	void __user buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	304	{
	305	char buf[64], *p;
	306	long pages, seconds;
	307	int len;
	308
	309	if (!lenp \|\| (ppos && !write)) {
	310	*lenp = 0;
	311	return 0;
	312	}
	313
	314	if (write) {
	315	len = *lenp;
	316	if (copy_from_user(buf, buffer,
	317	len > sizeof(buf) ? sizeof(buf) : len))
	318	return -EFAULT;
	319	buf[sizeof(buf) - 1] = '\0';
	320	cmm_skip_blanks(buf, &p);
	321	pages = cmm_strtoul(p, &p);
	322	cmm_skip_blanks(p, &p);
	323	seconds = cmm_strtoul(p, &p);
	324	cmm_set_timeout(pages, seconds);
	325	} else {
	326	len = sprintf(buf, "%ld %ld\n",
	327	cmm_timeout_pages, cmm_timeout_seconds);
	328	if (len > *lenp)
	329	len = *lenp;
	330	if (copy_to_user(buffer, buf, len))
	331	return -EFAULT;
	332	}
	333	*lenp = len;
	334	*ppos += len;
	335	return 0;
	336	}
	337
	338	static struct ctl_table cmm_table[] = {
	339	{
	340	.ctl_name = VM_CMM_PAGES,
	341	.procname = "cmm_pages",
	342	.mode = 0600,
	343	.proc_handler = &cmm_pages_handler,
	344	},
	345	{
	346	.ctl_name = VM_CMM_TIMED_PAGES,
	347	.procname = "cmm_timed_pages",
	348	.mode = 0600,
	349	.proc_handler = &cmm_pages_handler,
	350	},
	351	{
	352	.ctl_name = VM_CMM_TIMEOUT,
	353	.procname = "cmm_timeout",
	354	.mode = 0600,
	355	.proc_handler = &cmm_timeout_handler,
	356	},
	357	{ .ctl_name = 0 }
	358	};
	359
	360	static struct ctl_table cmm_dir_table[] = {
	361	{
	362	.ctl_name = CTL_VM,
	363	.procname = "vm",
	364	.maxlen = 0,
	365	.mode = 0555,
	366	.child = cmm_table,
	367	},
368	{ .ctl_name = 0 }
369	};
370	#endif
371
372	#ifdef CONFIG_CMM_IUCV
373	#define SMSG_PREFIX "CMM"
374	static void
15439d74	375	cmm_smsg_target(char from, char msg)
1da177e4 LT	376	{
	377	long pages, seconds;
	378
15439d74 MS	379	if (strlen(sender) > 0 && strcmp(from, sender) != 0)
15439d74 MS	380	return;
1da177e4 LT	381	if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
	382	return;
	383	if (strncmp(msg, "SHRINK", 6) == 0) {
	384	if (!cmm_skip_blanks(msg + 6, &msg))
	385	return;
	386	pages = cmm_strtoul(msg, &msg);
	387	cmm_skip_blanks(msg, &msg);
	388	if (*msg == '\0')
	389	cmm_set_pages(pages);
	390	} else if (strncmp(msg, "RELEASE", 7) == 0) {
	391	if (!cmm_skip_blanks(msg + 7, &msg))
	392	return;
	393	pages = cmm_strtoul(msg, &msg);
	394	cmm_skip_blanks(msg, &msg);
	395	if (*msg == '\0')
	396	cmm_add_timed_pages(pages);
	397	} else if (strncmp(msg, "REUSE", 5) == 0) {
	398	if (!cmm_skip_blanks(msg + 5, &msg))
	399	return;
	400	pages = cmm_strtoul(msg, &msg);
	401	if (!cmm_skip_blanks(msg, &msg))
	402	return;
	403	seconds = cmm_strtoul(msg, &msg);
	404	cmm_skip_blanks(msg, &msg);
	405	if (*msg == '\0')
	406	cmm_set_timeout(pages, seconds);
	407	}
	408	}
	409	#endif
	410
	411	struct ctl_table_header *cmm_sysctl_header;
	412
	413	static int
	414	cmm_init (void)
	415	{
	416	#ifdef CONFIG_CMM_PROC
	417	cmm_sysctl_header = register_sysctl_table(cmm_dir_table, 1);
	418	#endif
	419	#ifdef CONFIG_CMM_IUCV
	420	smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
	421	#endif
aaedd944	422	INIT_WORK(&cmm_thread_starter, (void *) cmm_start_thread, NULL);
1da177e4 LT	423	init_waitqueue_head(&cmm_thread_wait);
	424	init_timer(&cmm_timer);
	425	return 0;
	426	}
	427
	428	static void
	429	cmm_exit(void)
	430	{
	431	cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
	432	cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
	433	#ifdef CONFIG_CMM_PROC
	434	unregister_sysctl_table(cmm_sysctl_header);
	435	#endif
	436	#ifdef CONFIG_CMM_IUCV
	437	smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
	438	#endif
	439	}
	440
	441	module_init(cmm_init);
	442	module_exit(cmm_exit);
	443
	444	EXPORT_SYMBOL(cmm_set_pages);
	445	EXPORT_SYMBOL(cmm_get_pages);
	446	EXPORT_SYMBOL(cmm_add_timed_pages);
	447	EXPORT_SYMBOL(cmm_get_timed_pages);
	448	EXPORT_SYMBOL(cmm_set_timeout);
	449
	450	MODULE_LICENSE("GPL");