[deliverable/linux.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/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, NULL, 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		= 0644,
		.proc_handler	= &cmm_pages_handler,
	},
	{
		.ctl_name	= VM_CMM_TIMED_PAGES,
		.procname	= "cmm_timed_pages",
		.mode		= 0644,
		.proc_handler	= &cmm_pages_handler,
	},
	{
		.ctl_name	= VM_CMM_TIMEOUT,
		.procname	= "cmm_timeout",
		.mode		= 0644,
		.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
1da177e4 LT	11	#include <linux/errno.h>
	12	#include <linux/fs.h>
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/sched.h>
	16	#include <linux/sysctl.h>
	17	#include <linux/ctype.h>
	18
	19	#include <asm/pgalloc.h>
	20	#include <asm/uaccess.h>
	21
15439d74	22	static char *sender = "VMRMSVM";
447570cf	23	module_param(sender, charp, 0400);
15439d74 MS	24	MODULE_PARM_DESC(sender,
	25	"Guest name that may send SMSG messages (default VMRMSVM)");
	26
1da177e4 LT	27	#include "../../../drivers/s390/net/smsgiucv.h"
	28
	29	#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
	30
	31	struct cmm_page_array {
	32	struct cmm_page_array *next;
	33	unsigned long index;
	34	unsigned long pages[CMM_NR_PAGES];
	35	};
	36
	37	static long cmm_pages = 0;
	38	static long cmm_timed_pages = 0;
	39	static volatile long cmm_pages_target = 0;
	40	static volatile long cmm_timed_pages_target = 0;
	41	static long cmm_timeout_pages = 0;
	42	static long cmm_timeout_seconds = 0;
	43
aaedd944 AV	44	static struct cmm_page_array *cmm_page_list = NULL;
aaedd944 AV	45	static struct cmm_page_array *cmm_timed_page_list = NULL;
1da177e4 LT	46
	47	static unsigned long cmm_thread_active = 0;
	48	static struct work_struct cmm_thread_starter;
	49	static wait_queue_head_t cmm_thread_wait;
	50	static struct timer_list cmm_timer;
	51
	52	static void cmm_timer_fn(unsigned long);
	53	static void cmm_set_timer(void);
	54
	55	static long
	56	cmm_strtoul(const char cp, char *endp)
	57	{
	58	unsigned int base = 10;
	59
	60	if (*cp == '0') {
	61	base = 8;
	62	cp++;
	63	if ((cp == 'x' \|\| cp == 'X') && isxdigit(cp[1])) {
	64	base = 16;
	65	cp++;
	66	}
	67	}
	68	return simple_strtoul(cp, endp, base);
	69	}
	70
	71	static long
	72	cmm_alloc_pages(long pages, long counter, struct cmm_page_array *list)
	73	{
	74	struct cmm_page_array *pa;
	75	unsigned long page;
	76
	77	pa = *list;
	78	while (pages) {
	79	page = __get_free_page(GFP_NOIO);
	80	if (!page)
	81	break;
	82	if (!pa \|\| pa->index >= CMM_NR_PAGES) {
	83	/* Need a new page for the page list. */
	84	pa = (struct cmm_page_array *)
	85	__get_free_page(GFP_NOIO);
	86	if (!pa) {
	87	free_page(page);
	88	break;
	89	}
	90	pa->next = *list;
	91	pa->index = 0;
	92	*list = pa;
	93	}
	94	diag10(page);
	95	pa->pages[pa->index++] = page;
	96	(*counter)++;
	97	pages--;
	98	}
	99	return pages;
	100	}
	101
	102	static void
	103	cmm_free_pages(long pages, long counter, struct cmm_page_array *list)
	104	{
	105	struct cmm_page_array *pa;
	106	unsigned long page;
	107
	108	pa = *list;
	109	while (pages) {
110	if (!pa \|\| pa->index <= 0)
111	break;
112	page = 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(page);
119	(*counter)--;
120	pages--;
121	}
122	}
123
124	static int
125	cmm_thread(void *dummy)
126	{
127	int rc;
128
129	daemonize("cmmthread");
130	while (1) {
131	rc = wait_event_interruptible(cmm_thread_wait,
132	(cmm_pages != cmm_pages_target \|\|
133	cmm_timed_pages != cmm_timed_pages_target));
134	if (rc == -ERESTARTSYS) {
135	/* Got kill signal. End thread. */
136	clear_bit(0, &cmm_thread_active);
137	cmm_pages_target = cmm_pages;
138	cmm_timed_pages_target = cmm_timed_pages;
139	break;
140	}
141	if (cmm_pages_target > cmm_pages) {
142	if (cmm_alloc_pages(1, &cmm_pages, &cmm_page_list))
143	cmm_pages_target = cmm_pages;
144	} else if (cmm_pages_target < cmm_pages) {
145	cmm_free_pages(1, &cmm_pages, &cmm_page_list);
146	}
147	if (cmm_timed_pages_target > cmm_timed_pages) {
148	if (cmm_alloc_pages(1, &cmm_timed_pages,
149	&cmm_timed_page_list))
150	cmm_timed_pages_target = cmm_timed_pages;
151	} else if (cmm_timed_pages_target < cmm_timed_pages) {
152	cmm_free_pages(1, &cmm_timed_pages,
153	&cmm_timed_page_list);
154	}
155	if (cmm_timed_pages > 0 && !timer_pending(&cmm_timer))
156	cmm_set_timer();
157	}
158	return 0;
159	}
160
161	static void
162	cmm_start_thread(void)
163	{
d2c993d8	164	kernel_thread(cmm_thread, NULL, 0);
1da177e4 LT	165	}
	166
	167	static void
	168	cmm_kick_thread(void)
	169	{
	170	if (!test_and_set_bit(0, &cmm_thread_active))
	171	schedule_work(&cmm_thread_starter);
	172	wake_up(&cmm_thread_wait);
	173	}
	174
	175	static void
	176	cmm_set_timer(void)
	177	{
	178	if (cmm_timed_pages_target <= 0 \|\| cmm_timeout_seconds <= 0) {
	179	if (timer_pending(&cmm_timer))
	180	del_timer(&cmm_timer);
	181	return;
	182	}
	183	if (timer_pending(&cmm_timer)) {
	184	if (mod_timer(&cmm_timer, jiffies + cmm_timeout_seconds*HZ))
	185	return;
	186	}
	187	cmm_timer.function = cmm_timer_fn;
	188	cmm_timer.data = 0;
	189	cmm_timer.expires = jiffies + cmm_timeout_seconds*HZ;
	190	add_timer(&cmm_timer);
	191	}
	192
	193	static void
	194	cmm_timer_fn(unsigned long ignored)
	195	{
	196	long pages;
	197
	198	pages = cmm_timed_pages_target - cmm_timeout_pages;
	199	if (pages < 0)
	200	cmm_timed_pages_target = 0;
	201	else
	202	cmm_timed_pages_target = pages;
	203	cmm_kick_thread();
	204	cmm_set_timer();
	205	}
	206
	207	void
	208	cmm_set_pages(long pages)
	209	{
	210	cmm_pages_target = pages;
	211	cmm_kick_thread();
	212	}
	213
	214	long
	215	cmm_get_pages(void)
	216	{
	217	return cmm_pages;
	218	}
	219
	220	void
	221	cmm_add_timed_pages(long pages)
	222	{
	223	cmm_timed_pages_target += pages;
	224	cmm_kick_thread();
	225	}
	226
	227	long
	228	cmm_get_timed_pages(void)
229	{
230	return cmm_timed_pages;
231	}
232
233	void
234	cmm_set_timeout(long pages, long seconds)
235	{
236	cmm_timeout_pages = pages;
237	cmm_timeout_seconds = seconds;
238	cmm_set_timer();
239	}
240
241	static inline int
242	cmm_skip_blanks(char cp, char *endp)
243	{
244	char *str;
245
246	for (str = cp; str == ' ' \|\| str == '\t'; str++);
247	*endp = str;
248	return str != cp;
249	}
250
251	#ifdef CONFIG_CMM_PROC
252	/* These will someday get removed. */
253	#define VM_CMM_PAGES 1111
254	#define VM_CMM_TIMED_PAGES 1112
255	#define VM_CMM_TIMEOUT 1113
256
257	static struct ctl_table cmm_table[];
258
259	static int
260	cmm_pages_handler(ctl_table ctl, int write, struct file filp,
aaedd944	261	void __user buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	262	{
	263	char buf[16], *p;
	264	long pages;
	265	int len;
	266
	267	if (!lenp \|\| (ppos && !write)) {
	268	*lenp = 0;
	269	return 0;
	270	}
	271
	272	if (write) {
	273	len = *lenp;
	274	if (copy_from_user(buf, buffer,
	275	len > sizeof(buf) ? sizeof(buf) : len))
	276	return -EFAULT;
	277	buf[sizeof(buf) - 1] = '\0';
	278	cmm_skip_blanks(buf, &p);
	279	pages = cmm_strtoul(p, &p);
	280	if (ctl == &cmm_table[0])
	281	cmm_set_pages(pages);
	282	else
	283	cmm_add_timed_pages(pages);
	284	} else {
	285	if (ctl == &cmm_table[0])
	286	pages = cmm_get_pages();
	287	else
	288	pages = cmm_get_timed_pages();
	289	len = sprintf(buf, "%ld\n", pages);
	290	if (len > *lenp)
	291	len = *lenp;
	292	if (copy_to_user(buffer, buf, len))
	293	return -EFAULT;
	294	}
	295	*lenp = len;
	296	*ppos += len;
	297	return 0;
	298	}
	299
	300	static int
	301	cmm_timeout_handler(ctl_table ctl, int write, struct file filp,
aaedd944	302	void __user buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	303	{
	304	char buf[64], *p;
	305	long pages, seconds;
	306	int len;
	307
	308	if (!lenp \|\| (ppos && !write)) {
	309	*lenp = 0;
	310	return 0;
	311	}
	312
	313	if (write) {
	314	len = *lenp;
	315	if (copy_from_user(buf, buffer,
	316	len > sizeof(buf) ? sizeof(buf) : len))
	317	return -EFAULT;
	318	buf[sizeof(buf) - 1] = '\0';
	319	cmm_skip_blanks(buf, &p);
	320	pages = cmm_strtoul(p, &p);
	321	cmm_skip_blanks(p, &p);
	322	seconds = cmm_strtoul(p, &p);
	323	cmm_set_timeout(pages, seconds);
	324	} else {
	325	len = sprintf(buf, "%ld %ld\n",
	326	cmm_timeout_pages, cmm_timeout_seconds);
	327	if (len > *lenp)
	328	len = *lenp;
	329	if (copy_to_user(buffer, buf, len))
	330	return -EFAULT;
	331	}
	332	*lenp = len;
	333	*ppos += len;
	334	return 0;
	335	}
	336
	337	static struct ctl_table cmm_table[] = {
	338	{
	339	.ctl_name = VM_CMM_PAGES,
	340	.procname = "cmm_pages",
5e8b1c40	341	.mode = 0644,
1da177e4 LT	342	.proc_handler = &cmm_pages_handler,
	343	},
	344	{
	345	.ctl_name = VM_CMM_TIMED_PAGES,
	346	.procname = "cmm_timed_pages",
5e8b1c40	347	.mode = 0644,
1da177e4 LT	348	.proc_handler = &cmm_pages_handler,
	349	},
	350	{
	351	.ctl_name = VM_CMM_TIMEOUT,
	352	.procname = "cmm_timeout",
5e8b1c40	353	.mode = 0644,
1da177e4 LT	354	.proc_handler = &cmm_timeout_handler,
	355	},
	356	{ .ctl_name = 0 }
	357	};
	358
	359	static struct ctl_table cmm_dir_table[] = {
	360	{
	361	.ctl_name = CTL_VM,
	362	.procname = "vm",
	363	.maxlen = 0,
	364	.mode = 0555,
	365	.child = cmm_table,
	366	},
	367	{ .ctl_name = 0 }
	368	};
	369	#endif
	370
	371	#ifdef CONFIG_CMM_IUCV
	372	#define SMSG_PREFIX "CMM"
	373	static void
15439d74	374	cmm_smsg_target(char from, char msg)
1da177e4 LT	375	{
	376	long pages, seconds;
	377
15439d74 MS	378	if (strlen(sender) > 0 && strcmp(from, sender) != 0)
15439d74 MS	379	return;
1da177e4 LT	380	if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
	381	return;
	382	if (strncmp(msg, "SHRINK", 6) == 0) {
	383	if (!cmm_skip_blanks(msg + 6, &msg))
	384	return;
	385	pages = cmm_strtoul(msg, &msg);
	386	cmm_skip_blanks(msg, &msg);
	387	if (*msg == '\0')
	388	cmm_set_pages(pages);
	389	} else if (strncmp(msg, "RELEASE", 7) == 0) {
	390	if (!cmm_skip_blanks(msg + 7, &msg))
	391	return;
	392	pages = cmm_strtoul(msg, &msg);
	393	cmm_skip_blanks(msg, &msg);
	394	if (*msg == '\0')
	395	cmm_add_timed_pages(pages);
	396	} else if (strncmp(msg, "REUSE", 5) == 0) {
	397	if (!cmm_skip_blanks(msg + 5, &msg))
	398	return;
	399	pages = cmm_strtoul(msg, &msg);
	400	if (!cmm_skip_blanks(msg, &msg))
	401	return;
	402	seconds = cmm_strtoul(msg, &msg);
	403	cmm_skip_blanks(msg, &msg);
	404	if (*msg == '\0')
	405	cmm_set_timeout(pages, seconds);
	406	}
	407	}
	408	#endif
	409
	410	struct ctl_table_header *cmm_sysctl_header;
	411
	412	static int
	413	cmm_init (void)
	414	{
	415	#ifdef CONFIG_CMM_PROC
	416	cmm_sysctl_header = register_sysctl_table(cmm_dir_table, 1);
	417	#endif
	418	#ifdef CONFIG_CMM_IUCV
	419	smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
	420	#endif
aaedd944	421	INIT_WORK(&cmm_thread_starter, (void *) cmm_start_thread, NULL);
1da177e4 LT	422	init_waitqueue_head(&cmm_thread_wait);
	423	init_timer(&cmm_timer);
	424	return 0;
	425	}
	426
	427	static void
	428	cmm_exit(void)
	429	{
	430	cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
	431	cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
	432	#ifdef CONFIG_CMM_PROC
	433	unregister_sysctl_table(cmm_sysctl_header);
	434	#endif
	435	#ifdef CONFIG_CMM_IUCV
	436	smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
	437	#endif
	438	}
	439
	440	module_init(cmm_init);
	441	module_exit(cmm_exit);
	442
	443	EXPORT_SYMBOL(cmm_set_pages);
	444	EXPORT_SYMBOL(cmm_get_pages);
	445	EXPORT_SYMBOL(cmm_add_timed_pages);
	446	EXPORT_SYMBOL(cmm_get_timed_pages);
	447	EXPORT_SYMBOL(cmm_set_timeout);
	448
	449	MODULE_LICENSE("GPL");