[deliverable/linux.git] / arch / s390 / appldata / appldata_base.c

/*
 * arch/s390/appldata/appldata_base.c
 *
 * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
 * Exports appldata_register_ops() and appldata_unregister_ops() for the
 * data gathering modules.
 *
 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/workqueue.h>
#include <asm/appldata.h>
#include <asm/timer.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/smp.h>

#include "appldata.h"


#define MY_PRINT_NAME	"appldata"		/* for debug messages, etc. */
#define APPLDATA_CPU_INTERVAL	10000		/* default (CPU) time for
						   sampling interval in
						   milliseconds */

#define TOD_MICRO	0x01000			/* nr. of TOD clock units
						   for 1 microsecond */
/*
 * /proc entries (sysctl)
 */
static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
				  void __user *buffer, size_t *lenp, loff_t *ppos);
static int appldata_interval_handler(ctl_table *ctl, int write,
					 struct file *filp,
					 void __user *buffer,
					 size_t *lenp, loff_t *ppos);

static struct ctl_table_header *appldata_sysctl_header;
static struct ctl_table appldata_table[] = {
	{
		.ctl_name	= CTL_APPLDATA_TIMER,
		.procname	= "timer",
		.mode		= S_IRUGO | S_IWUSR,
		.proc_handler	= &appldata_timer_handler,
	},
	{
		.ctl_name	= CTL_APPLDATA_INTERVAL,
		.procname	= "interval",
		.mode		= S_IRUGO | S_IWUSR,
		.proc_handler	= &appldata_interval_handler,
	},
	{ .ctl_name = 0 }
};

static struct ctl_table appldata_dir_table[] = {
	{
		.ctl_name	= CTL_APPLDATA,
		.procname	= appldata_proc_name,
		.maxlen		= 0,
		.mode		= S_IRUGO | S_IXUGO,
		.child		= appldata_table,
	},
	{ .ctl_name = 0 }
};

/*
 * Timer
 */
DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
static atomic_t appldata_expire_count = ATOMIC_INIT(0);

static DEFINE_SPINLOCK(appldata_timer_lock);
static int appldata_interval = APPLDATA_CPU_INTERVAL;
static int appldata_timer_active;

/*
 * Work queue
 */
static struct workqueue_struct *appldata_wq;
static void appldata_work_fn(void *data);
static DECLARE_WORK(appldata_work, appldata_work_fn, NULL);


/*
 * Ops list
 */
static DEFINE_SPINLOCK(appldata_ops_lock);
static LIST_HEAD(appldata_ops_list);


/*************************** timer, work, DIAG *******************************/
/*
 * appldata_timer_function()
 *
 * schedule work and reschedule timer
 */
static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
{
	P_DEBUG("   -= Timer =-\n");
	P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
		atomic_read(&appldata_expire_count));
	if (atomic_dec_and_test(&appldata_expire_count)) {
		atomic_set(&appldata_expire_count, num_online_cpus());
		queue_work(appldata_wq, (struct work_struct *) data);
	}
}

/*
 * appldata_work_fn()
 *
 * call data gathering function for each (active) module
 */
static void appldata_work_fn(void *data)
{
	struct list_head *lh;
	struct appldata_ops *ops;
	int i;

	P_DEBUG("  -= Work Queue =-\n");
	i = 0;
	spin_lock(&appldata_ops_lock);
	list_for_each(lh, &appldata_ops_list) {
		ops = list_entry(lh, struct appldata_ops, list);
		P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
			++i, ops->active, ops->name);
		if (ops->active == 1) {
			ops->callback(ops->data);
		}
	}
	spin_unlock(&appldata_ops_lock);
}

/*
 * appldata_diag()
 *
 * prepare parameter list, issue DIAG 0xDC
 */
int appldata_diag(char record_nr, u16 function, unsigned long buffer,
			u16 length, char *mod_lvl)
{
	struct appldata_product_id id = {
		.prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
			       0xE7, 0xD2, 0xD9},	/* "LINUXKR" */
		.prod_fn    = 0xD5D3,			/* "NL" */
		.version_nr = 0xF2F6,			/* "26" */
		.release_nr = 0xF0F1,			/* "01" */
	};

	id.record_nr = record_nr;
	id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
	return appldata_asm(&id, function, (void *) buffer, length);
}
/************************ timer, work, DIAG <END> ****************************/


/****************************** /proc stuff **********************************/

/*
 * appldata_mod_vtimer_wrap()
 *
 * wrapper function for mod_virt_timer(), because smp_call_function_on()
 * accepts only one parameter.
 */
static void __appldata_mod_vtimer_wrap(void *p) {
	struct {
		struct vtimer_list *timer;
		u64    expires;
	} *args = p;
	mod_virt_timer(args->timer, args->expires);
}

#define APPLDATA_ADD_TIMER	0
#define APPLDATA_DEL_TIMER	1
#define APPLDATA_MOD_TIMER	2

/*
 * __appldata_vtimer_setup()
 *
 * Add, delete or modify virtual timers on all online cpus.
 * The caller needs to get the appldata_timer_lock spinlock.
 */
static void
__appldata_vtimer_setup(int cmd)
{
	u64 per_cpu_interval;
	int i;

	switch (cmd) {
	case APPLDATA_ADD_TIMER:
		if (appldata_timer_active)
			break;
		per_cpu_interval = (u64) (appldata_interval*1000 /
					  num_online_cpus()) * TOD_MICRO;
		for_each_online_cpu(i) {
			per_cpu(appldata_timer, i).expires = per_cpu_interval;
			smp_call_function_on(add_virt_timer_periodic,
					     &per_cpu(appldata_timer, i),
					     0, 1, i);
		}
		appldata_timer_active = 1;
		P_INFO("Monitoring timer started.\n");
		break;
	case APPLDATA_DEL_TIMER:
		for_each_online_cpu(i)
			del_virt_timer(&per_cpu(appldata_timer, i));
		if (!appldata_timer_active)
			break;
		appldata_timer_active = 0;
		atomic_set(&appldata_expire_count, num_online_cpus());
		P_INFO("Monitoring timer stopped.\n");
		break;
	case APPLDATA_MOD_TIMER:
		per_cpu_interval = (u64) (appldata_interval*1000 /
					  num_online_cpus()) * TOD_MICRO;
		if (!appldata_timer_active)
			break;
		for_each_online_cpu(i) {
			struct {
				struct vtimer_list *timer;
				u64    expires;
			} args;
			args.timer = &per_cpu(appldata_timer, i);
			args.expires = per_cpu_interval;
			smp_call_function_on(__appldata_mod_vtimer_wrap,
					     &args, 0, 1, i);
		}
	}
}

/*
 * appldata_timer_handler()
 *
 * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 */
static int
appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int len;
	char buf[2];

	if (!*lenp || *ppos) {
		*lenp = 0;
		return 0;
	}
	if (!write) {
		len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
		if (len > *lenp)
			len = *lenp;
		if (copy_to_user(buffer, buf, len))
			return -EFAULT;
		goto out;
	}
	len = *lenp;
	if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
		return -EFAULT;
	spin_lock(&appldata_timer_lock);
	if (buf[0] == '1')
		__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
	else if (buf[0] == '0')
		__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
	spin_unlock(&appldata_timer_lock);
out:
	*lenp = len;
	*ppos += len;
	return 0;
}

/*
 * appldata_interval_handler()
 *
 * Set (CPU) timer interval for collection of data (in milliseconds), show
 * current timer interval.
 */
static int
appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int len, interval;
	char buf[16];

	if (!*lenp || *ppos) {
		*lenp = 0;
		return 0;
	}
	if (!write) {
		len = sprintf(buf, "%i\n", appldata_interval);
		if (len > *lenp)
			len = *lenp;
		if (copy_to_user(buffer, buf, len))
			return -EFAULT;
		goto out;
	}
	len = *lenp;
	if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
		return -EFAULT;
	}
	sscanf(buf, "%i", &interval);
	if (interval <= 0) {
		P_ERROR("Timer CPU interval has to be > 0!\n");
		return -EINVAL;
	}

	spin_lock(&appldata_timer_lock);
	appldata_interval = interval;
	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	spin_unlock(&appldata_timer_lock);

	P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
		 interval);
out:
	*lenp = len;
	*ppos += len;
	return 0;
}

/*
 * appldata_generic_handler()
 *
 * Generic start/stop monitoring and DIAG, show status of
 * monitoring (0 = not in process, 1 = in process)
 */
static int
appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	struct appldata_ops *ops = NULL, *tmp_ops;
	int rc, len, found;
	char buf[2];
	struct list_head *lh;

	found = 0;
	spin_lock(&appldata_ops_lock);
	list_for_each(lh, &appldata_ops_list) {
		tmp_ops = list_entry(lh, struct appldata_ops, list);
		if (&tmp_ops->ctl_table[2] == ctl) {
			found = 1;
		}
	}
	if (!found) {
		spin_unlock(&appldata_ops_lock);
		return -ENODEV;
	}
	ops = ctl->data;
	if (!try_module_get(ops->owner)) {	// protect this function
		spin_unlock(&appldata_ops_lock);
		return -ENODEV;
	}
	spin_unlock(&appldata_ops_lock);

	if (!*lenp || *ppos) {
		*lenp = 0;
		module_put(ops->owner);
		return 0;
	}
	if (!write) {
		len = sprintf(buf, ops->active ? "1\n" : "0\n");
		if (len > *lenp)
			len = *lenp;
		if (copy_to_user(buffer, buf, len)) {
			module_put(ops->owner);
			return -EFAULT;
		}
		goto out;
	}
	len = *lenp;
	if (copy_from_user(buf, buffer,
			   len > sizeof(buf) ? sizeof(buf) : len)) {
		module_put(ops->owner);
		return -EFAULT;
	}

	spin_lock(&appldata_ops_lock);
	if ((buf[0] == '1') && (ops->active == 0)) {
		// protect work queue callback
		if (!try_module_get(ops->owner)) {
			spin_unlock(&appldata_ops_lock);
			module_put(ops->owner);
			return -ENODEV;
		}
		ops->callback(ops->data);	// init record
		rc = appldata_diag(ops->record_nr,
					APPLDATA_START_INTERVAL_REC,
					(unsigned long) ops->data, ops->size,
					ops->mod_lvl);
		if (rc != 0) {
			P_ERROR("START DIAG 0xDC for %s failed, "
				"return code: %d\n", ops->name, rc);
			module_put(ops->owner);
		} else {
			P_INFO("Monitoring %s data enabled, "
				"DIAG 0xDC started.\n", ops->name);
			ops->active = 1;
		}
	} else if ((buf[0] == '0') && (ops->active == 1)) {
		ops->active = 0;
		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
				(unsigned long) ops->data, ops->size,
				ops->mod_lvl);
		if (rc != 0) {
			P_ERROR("STOP DIAG 0xDC for %s failed, "
				"return code: %d\n", ops->name, rc);
		} else {
			P_INFO("Monitoring %s data disabled, "
				"DIAG 0xDC stopped.\n", ops->name);
		}
		module_put(ops->owner);
	}
	spin_unlock(&appldata_ops_lock);
out:
	*lenp = len;
	*ppos += len;
	module_put(ops->owner);
	return 0;
}

/*************************** /proc stuff <END> *******************************/


/************************* module-ops management *****************************/
/*
 * appldata_register_ops()
 *
 * update ops list, register /proc/sys entries
 */
int appldata_register_ops(struct appldata_ops *ops)
{
	struct list_head *lh;
	struct appldata_ops *tmp_ops;
	int i;

	i = 0;

	if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
		(ops->size < 0)){
		P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
			ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
		return -ENOMEM;
	}
	if ((ops->ctl_nr == CTL_APPLDATA) ||
	    (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
	    (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
		P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
		return -EBUSY;
	}
	ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
	if (ops->ctl_table == NULL) {
		P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
		return -ENOMEM;
	}

	spin_lock(&appldata_ops_lock);
	list_for_each(lh, &appldata_ops_list) {
		tmp_ops = list_entry(lh, struct appldata_ops, list);
		P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
			++i, tmp_ops->name, tmp_ops->ctl_nr);
		P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
			tmp_ops->name, tmp_ops->ctl_nr, ops->name,
			ops->ctl_nr);
		if (strncmp(tmp_ops->name, ops->name,
				APPLDATA_PROC_NAME_LENGTH) == 0) {
			P_ERROR("Name \"%s\" already registered!\n", ops->name);
			kfree(ops->ctl_table);
			spin_unlock(&appldata_ops_lock);
			return -EBUSY;
		}
		if (tmp_ops->ctl_nr == ops->ctl_nr) {
			P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
			kfree(ops->ctl_table);
			spin_unlock(&appldata_ops_lock);
			return -EBUSY;
		}
	}
	list_add(&ops->list, &appldata_ops_list);
	spin_unlock(&appldata_ops_lock);

	ops->ctl_table[0].ctl_name = CTL_APPLDATA;
	ops->ctl_table[0].procname = appldata_proc_name;
	ops->ctl_table[0].maxlen   = 0;
	ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
	ops->ctl_table[0].child    = &ops->ctl_table[2];

	ops->ctl_table[1].ctl_name = 0;

	ops->ctl_table[2].ctl_name = ops->ctl_nr;
	ops->ctl_table[2].procname = ops->name;
	ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
	ops->ctl_table[2].proc_handler = appldata_generic_handler;
	ops->ctl_table[2].data = ops;

	ops->ctl_table[3].ctl_name = 0;

	ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);

	P_INFO("%s-ops registered!\n", ops->name);
	return 0;
}

/*
 * appldata_unregister_ops()
 *
 * update ops list, unregister /proc entries, stop DIAG if necessary
 */
void appldata_unregister_ops(struct appldata_ops *ops)
{
	void *table;
	spin_lock(&appldata_ops_lock);
	list_del(&ops->list);
	/* at that point any incoming access will fail */
	table = ops->ctl_table;
	ops->ctl_table = NULL;
	spin_unlock(&appldata_ops_lock);
	unregister_sysctl_table(ops->sysctl_header);
	kfree(table);
	P_INFO("%s-ops unregistered!\n", ops->name);
}
/********************** module-ops management <END> **************************/


/******************************* init / exit *********************************/

static void
appldata_online_cpu(int cpu)
{
	init_virt_timer(&per_cpu(appldata_timer, cpu));
	per_cpu(appldata_timer, cpu).function = appldata_timer_function;
	per_cpu(appldata_timer, cpu).data = (unsigned long)
		&appldata_work;
	atomic_inc(&appldata_expire_count);
	spin_lock(&appldata_timer_lock);
	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	spin_unlock(&appldata_timer_lock);
}

static void
appldata_offline_cpu(int cpu)
{
	del_virt_timer(&per_cpu(appldata_timer, cpu));
	if (atomic_dec_and_test(&appldata_expire_count)) {
		atomic_set(&appldata_expire_count, num_online_cpus());
		queue_work(appldata_wq, &appldata_work);
	}
	spin_lock(&appldata_timer_lock);
	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	spin_unlock(&appldata_timer_lock);
}

#ifdef CONFIG_HOTPLUG_CPU
static int __cpuinit
appldata_cpu_notify(struct notifier_block *self,
		    unsigned long action, void *hcpu)
{
	switch (action) {
	case CPU_ONLINE:
		appldata_online_cpu((long) hcpu);
		break;
	case CPU_DEAD:
		appldata_offline_cpu((long) hcpu);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block appldata_nb = {
	.notifier_call = appldata_cpu_notify,
};
#endif

/*
 * appldata_init()
 *
 * init timer, register /proc entries
 */
static int __init appldata_init(void)
{
	int i;

	P_DEBUG("sizeof(parameter_list) = %lu\n",
		sizeof(struct appldata_parameter_list));

	appldata_wq = create_singlethread_workqueue("appldata");
	if (!appldata_wq) {
		P_ERROR("Could not create work queue\n");
		return -ENOMEM;
	}

	for_each_online_cpu(i)
		appldata_online_cpu(i);

	/* Register cpu hotplug notifier */
	register_hotcpu_notifier(&appldata_nb);

	appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
#ifdef MODULE
	appldata_dir_table[0].de->owner = THIS_MODULE;
	appldata_table[0].de->owner = THIS_MODULE;
	appldata_table[1].de->owner = THIS_MODULE;
#endif

	P_DEBUG("Base interface initialized.\n");
	return 0;
}

/*
 * appldata_exit()
 *
 * stop timer, unregister /proc entries
 */
static void __exit appldata_exit(void)
{
	struct list_head *lh;
	struct appldata_ops *ops;
	int rc, i;

	P_DEBUG("Unloading module ...\n");
	/*
	 * ops list should be empty, but just in case something went wrong...
	 */
	spin_lock(&appldata_ops_lock);
	list_for_each(lh, &appldata_ops_list) {
		ops = list_entry(lh, struct appldata_ops, list);
		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
				(unsigned long) ops->data, ops->size,
				ops->mod_lvl);
		if (rc != 0) {
			P_ERROR("STOP DIAG 0xDC for %s failed, "
				"return code: %d\n", ops->name, rc);
		}
	}
	spin_unlock(&appldata_ops_lock);

	for_each_online_cpu(i)
		appldata_offline_cpu(i);

	appldata_timer_active = 0;

	unregister_sysctl_table(appldata_sysctl_header);

	destroy_workqueue(appldata_wq);
	P_DEBUG("... module unloaded!\n");
}
/**************************** init / exit <END> ******************************/


module_init(appldata_init);
module_exit(appldata_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");

EXPORT_SYMBOL_GPL(appldata_register_ops);
EXPORT_SYMBOL_GPL(appldata_unregister_ops);
EXPORT_SYMBOL_GPL(appldata_diag);

#ifdef MODULE
/*
 * Kernel symbols needed by appldata_mem and appldata_os modules.
 * However, if this file is compiled as a module (for testing only), these
 * symbols are not exported. In this case, we define them locally and export
 * those.
 */
void si_swapinfo(struct sysinfo *val)
{
	val->freeswap = -1ul;
	val->totalswap = -1ul;
}

unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
				-1 - FIXED_1/200};
int nr_threads = -1;

void get_full_page_state(struct page_state *ps)
{
	memset(ps, -1, sizeof(struct page_state));
}

unsigned long nr_running(void)
{
	return -1;
}

unsigned long nr_iowait(void)
{
	return -1;
}

/*unsigned long nr_context_switches(void)
{
	return -1;
}*/
#endif /* MODULE */
EXPORT_SYMBOL_GPL(si_swapinfo);
EXPORT_SYMBOL_GPL(nr_threads);
EXPORT_SYMBOL_GPL(nr_running);
EXPORT_SYMBOL_GPL(nr_iowait);
//EXPORT_SYMBOL_GPL(nr_context_switches);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/s390/appldata/appldata_base.c
	3	*
	4	* Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
	5	* Exports appldata_register_ops() and appldata_unregister_ops() for the
	6	* data gathering modules.
	7	*
5b5dd21a	8	* Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
1da177e4	9	*
5b5dd21a	10	* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
1da177e4 LT	11	*/
1da177e4 LT	12
1da177e4 LT	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/slab.h>
	16	#include <linux/errno.h>
1da177e4 LT	17	#include <linux/interrupt.h>
1da177e4 LT	18	#include <linux/proc_fs.h>
2dcea57a	19	#include <linux/mm.h>
1da177e4 LT	20	#include <linux/swap.h>
	21	#include <linux/pagemap.h>
	22	#include <linux/sysctl.h>
1da177e4 LT	23	#include <linux/notifier.h>
1da177e4 LT	24	#include <linux/cpu.h>
f26d583e	25	#include <linux/workqueue.h>
1f38d613 GS	26	#include <asm/appldata.h>
	27	#include <asm/timer.h>
	28	#include <asm/uaccess.h>
	29	#include <asm/io.h>
	30	#include <asm/smp.h>
1da177e4 LT	31
	32	#include "appldata.h"
	33
	34
	35	#define MY_PRINT_NAME "appldata" /* for debug messages, etc. */
	36	#define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for
	37	sampling interval in
	38	milliseconds */
	39
	40	#define TOD_MICRO 0x01000 /* nr. of TOD clock units
	41	for 1 microsecond */
1da177e4 LT	42	/*
	43	* /proc entries (sysctl)
	44	*/
	45	static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
	46	static int appldata_timer_handler(ctl_table ctl, int write, struct file filp,
	47	void __user buffer, size_t lenp, loff_t *ppos);
	48	static int appldata_interval_handler(ctl_table *ctl, int write,
	49	struct file *filp,
	50	void __user *buffer,
	51	size_t lenp, loff_t ppos);
	52
	53	static struct ctl_table_header *appldata_sysctl_header;
	54	static struct ctl_table appldata_table[] = {
	55	{
	56	.ctl_name = CTL_APPLDATA_TIMER,
	57	.procname = "timer",
	58	.mode = S_IRUGO \| S_IWUSR,
	59	.proc_handler = &appldata_timer_handler,
	60	},
	61	{
	62	.ctl_name = CTL_APPLDATA_INTERVAL,
	63	.procname = "interval",
	64	.mode = S_IRUGO \| S_IWUSR,
	65	.proc_handler = &appldata_interval_handler,
	66	},
	67	{ .ctl_name = 0 }
	68	};
	69
	70	static struct ctl_table appldata_dir_table[] = {
	71	{
	72	.ctl_name = CTL_APPLDATA,
	73	.procname = appldata_proc_name,
	74	.maxlen = 0,
	75	.mode = S_IRUGO \| S_IXUGO,
	76	.child = appldata_table,
	77	},
	78	{ .ctl_name = 0 }
	79	};
	80
	81	/*
	82	* Timer
	83	*/
	84	DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
	85	static atomic_t appldata_expire_count = ATOMIC_INIT(0);
	86
	87	static DEFINE_SPINLOCK(appldata_timer_lock);
	88	static int appldata_interval = APPLDATA_CPU_INTERVAL;
	89	static int appldata_timer_active;
	90
	91	/*
f26d583e	92	* Work queue
1da177e4	93	*/
f26d583e GS	94	static struct workqueue_struct *appldata_wq;
	95	static void appldata_work_fn(void *data);
	96	static DECLARE_WORK(appldata_work, appldata_work_fn, NULL);
	97
1da177e4 LT	98
	99	/*
	100	* Ops list
	101	*/
	102	static DEFINE_SPINLOCK(appldata_ops_lock);
	103	static LIST_HEAD(appldata_ops_list);
	104
	105
f26d583e	106	/************************* timer, work, DIAG *****************************/
1da177e4 LT	107	/*
	108	* appldata_timer_function()
	109	*
f26d583e	110	* schedule work and reschedule timer
1da177e4 LT	111	*/
	112	static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
	113	{
	114	P_DEBUG(" -= Timer =-\n");
	115	P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
	116	atomic_read(&appldata_expire_count));
	117	if (atomic_dec_and_test(&appldata_expire_count)) {
	118	atomic_set(&appldata_expire_count, num_online_cpus());
f26d583e	119	queue_work(appldata_wq, (struct work_struct *) data);
1da177e4 LT	120	}
	121	}
	122
	123	/*
f26d583e	124	* appldata_work_fn()
1da177e4 LT	125	*
	126	* call data gathering function for each (active) module
	127	*/
f26d583e	128	static void appldata_work_fn(void *data)
1da177e4 LT	129	{
	130	struct list_head *lh;
	131	struct appldata_ops *ops;
	132	int i;
	133
f26d583e	134	P_DEBUG(" -= Work Queue =-\n");
1da177e4 LT	135	i = 0;
	136	spin_lock(&appldata_ops_lock);
	137	list_for_each(lh, &appldata_ops_list) {
	138	ops = list_entry(lh, struct appldata_ops, list);
	139	P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
	140	++i, ops->active, ops->name);
	141	if (ops->active == 1) {
	142	ops->callback(ops->data);
	143	}
	144	}
	145	spin_unlock(&appldata_ops_lock);
	146	}
	147
	148	/*
	149	* appldata_diag()
	150	*
	151	* prepare parameter list, issue DIAG 0xDC
	152	*/
5b5dd21a GS	153	int appldata_diag(char record_nr, u16 function, unsigned long buffer,
5b5dd21a GS	154	u16 length, char *mod_lvl)
1da177e4	155	{
1f38d613	156	struct appldata_product_id id = {
1da177e4	157	.prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
1f38d613 GS	158	0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
1f38d613 GS	159	.prod_fn = 0xD5D3, /* "NL" */
1f38d613 GS	160	.version_nr = 0xF2F6, /* "26" */
1f38d613 GS	161	.release_nr = 0xF0F1, /* "01" */
1da177e4 LT	162	};
1da177e4 LT	163
925afbd6 GS	164	id.record_nr = record_nr;
925afbd6 GS	165	id.mod_lvl = (mod_lvl[0]) << 8 \| mod_lvl[1];
1f38d613	166	return appldata_asm(&id, function, (void *) buffer, length);
1da177e4	167	}
f26d583e	168	/********************** timer, work, DIAG <END> **************************/
1da177e4 LT	169
	170
	171	/**************************** /proc stuff ********************************/
	172
	173	/*
	174	* appldata_mod_vtimer_wrap()
	175	*
	176	* wrapper function for mod_virt_timer(), because smp_call_function_on()
	177	* accepts only one parameter.
	178	*/
	179	static void __appldata_mod_vtimer_wrap(void *p) {
	180	struct {
	181	struct vtimer_list *timer;
	182	u64 expires;
	183	} *args = p;
	184	mod_virt_timer(args->timer, args->expires);
	185	}
	186
	187	#define APPLDATA_ADD_TIMER 0
	188	#define APPLDATA_DEL_TIMER 1
	189	#define APPLDATA_MOD_TIMER 2
	190
	191	/*
	192	* __appldata_vtimer_setup()
	193	*
	194	* Add, delete or modify virtual timers on all online cpus.
	195	* The caller needs to get the appldata_timer_lock spinlock.
	196	*/
	197	static void
	198	__appldata_vtimer_setup(int cmd)
	199	{
	200	u64 per_cpu_interval;
	201	int i;
	202
	203	switch (cmd) {
	204	case APPLDATA_ADD_TIMER:
	205	if (appldata_timer_active)
	206	break;
	207	per_cpu_interval = (u64) (appldata_interval*1000 /
	208	num_online_cpus()) * TOD_MICRO;
	209	for_each_online_cpu(i) {
	210	per_cpu(appldata_timer, i).expires = per_cpu_interval;
	211	smp_call_function_on(add_virt_timer_periodic,
	212	&per_cpu(appldata_timer, i),
	213	0, 1, i);
	214	}
	215	appldata_timer_active = 1;
	216	P_INFO("Monitoring timer started.\n");
	217	break;
	218	case APPLDATA_DEL_TIMER:
	219	for_each_online_cpu(i)
	220	del_virt_timer(&per_cpu(appldata_timer, i));
	221	if (!appldata_timer_active)
	222	break;
	223	appldata_timer_active = 0;
	224	atomic_set(&appldata_expire_count, num_online_cpus());
	225	P_INFO("Monitoring timer stopped.\n");
	226	break;
	227	case APPLDATA_MOD_TIMER:
	228	per_cpu_interval = (u64) (appldata_interval*1000 /
	229	num_online_cpus()) * TOD_MICRO;
	230	if (!appldata_timer_active)
	231	break;
	232	for_each_online_cpu(i) {
233	struct {
234	struct vtimer_list *timer;
235	u64 expires;
236	} args;
237	args.timer = &per_cpu(appldata_timer, i);
238	args.expires = per_cpu_interval;
239	smp_call_function_on(__appldata_mod_vtimer_wrap,
240	&args, 0, 1, i);
241	}
242	}
243	}
244
245	/*
246	* appldata_timer_handler()
247	*
248	* Start/Stop timer, show status of timer (0 = not active, 1 = active)
249	*/
250	static int
251	appldata_timer_handler(ctl_table ctl, int write, struct file filp,
252	void __user buffer, size_t lenp, loff_t *ppos)
253	{
254	int len;
255	char buf[2];
256
257	if (!lenp \|\| ppos) {
258	*lenp = 0;
259	return 0;
260	}
261	if (!write) {
262	len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
263	if (len > *lenp)
264	len = *lenp;
265	if (copy_to_user(buffer, buf, len))
266	return -EFAULT;
267	goto out;
268	}
269	len = *lenp;
270	if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
271	return -EFAULT;
272	spin_lock(&appldata_timer_lock);
273	if (buf[0] == '1')
274	__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
275	else if (buf[0] == '0')
276	__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
277	spin_unlock(&appldata_timer_lock);
278	out:
279	*lenp = len;
280	*ppos += len;
281	return 0;
282	}
283
284	/*
285	* appldata_interval_handler()
286	*
287	* Set (CPU) timer interval for collection of data (in milliseconds), show
288	* current timer interval.
289	*/
290	static int
291	appldata_interval_handler(ctl_table ctl, int write, struct file filp,
292	void __user buffer, size_t lenp, loff_t *ppos)
293	{
294	int len, interval;
295	char buf[16];
296
297	if (!lenp \|\| ppos) {
298	*lenp = 0;
299	return 0;
300	}
301	if (!write) {
302	len = sprintf(buf, "%i\n", appldata_interval);
303	if (len > *lenp)
304	len = *lenp;
305	if (copy_to_user(buffer, buf, len))
306	return -EFAULT;
307	goto out;
308	}
309	len = *lenp;
310	if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
311	return -EFAULT;
312	}
313	sscanf(buf, "%i", &interval);
314	if (interval <= 0) {
315	P_ERROR("Timer CPU interval has to be > 0!\n");
316	return -EINVAL;
317	}
318
319	spin_lock(&appldata_timer_lock);
320	appldata_interval = interval;
321	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
322	spin_unlock(&appldata_timer_lock);
323
324	P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
325	interval);
326	out:
327	*lenp = len;
328	*ppos += len;
329	return 0;
330	}
331
332	/*
333	* appldata_generic_handler()
334	*
335	* Generic start/stop monitoring and DIAG, show status of
336	* monitoring (0 = not in process, 1 = in process)
337	*/
338	static int
339	appldata_generic_handler(ctl_table ctl, int write, struct file filp,
340	void __user buffer, size_t lenp, loff_t *ppos)
341	{
342	struct appldata_ops ops = NULL, tmp_ops;
343	int rc, len, found;
344	char buf[2];
345	struct list_head *lh;
346
347	found = 0;
f26d583e	348	spin_lock(&appldata_ops_lock);
1da177e4 LT	349	list_for_each(lh, &appldata_ops_list) {
	350	tmp_ops = list_entry(lh, struct appldata_ops, list);
	351	if (&tmp_ops->ctl_table[2] == ctl) {
	352	found = 1;
	353	}
	354	}
	355	if (!found) {
f26d583e	356	spin_unlock(&appldata_ops_lock);
1da177e4 LT	357	return -ENODEV;
	358	}
	359	ops = ctl->data;
	360	if (!try_module_get(ops->owner)) { // protect this function
f26d583e	361	spin_unlock(&appldata_ops_lock);
1da177e4 LT	362	return -ENODEV;
1da177e4 LT	363	}
f26d583e	364	spin_unlock(&appldata_ops_lock);
1da177e4 LT	365
	366	if (!lenp \|\| ppos) {
	367	*lenp = 0;
	368	module_put(ops->owner);
	369	return 0;
	370	}
	371	if (!write) {
	372	len = sprintf(buf, ops->active ? "1\n" : "0\n");
	373	if (len > *lenp)
	374	len = *lenp;
	375	if (copy_to_user(buffer, buf, len)) {
	376	module_put(ops->owner);
	377	return -EFAULT;
	378	}
	379	goto out;
	380	}
	381	len = *lenp;
	382	if (copy_from_user(buf, buffer,
	383	len > sizeof(buf) ? sizeof(buf) : len)) {
	384	module_put(ops->owner);
	385	return -EFAULT;
	386	}
	387
f26d583e	388	spin_lock(&appldata_ops_lock);
1da177e4	389	if ((buf[0] == '1') && (ops->active == 0)) {
f26d583e GS	390	// protect work queue callback
	391	if (!try_module_get(ops->owner)) {
	392	spin_unlock(&appldata_ops_lock);
1da177e4 LT	393	module_put(ops->owner);
	394	return -ENODEV;
	395	}
1da177e4 LT	396	ops->callback(ops->data); // init record
	397	rc = appldata_diag(ops->record_nr,
	398	APPLDATA_START_INTERVAL_REC,
5b5dd21a GS	399	(unsigned long) ops->data, ops->size,
5b5dd21a GS	400	ops->mod_lvl);
1da177e4 LT	401	if (rc != 0) {
	402	P_ERROR("START DIAG 0xDC for %s failed, "
	403	"return code: %d\n", ops->name, rc);
	404	module_put(ops->owner);
1da177e4 LT	405	} else {
	406	P_INFO("Monitoring %s data enabled, "
	407	"DIAG 0xDC started.\n", ops->name);
5b5dd21a	408	ops->active = 1;
1da177e4 LT	409	}
	410	} else if ((buf[0] == '0') && (ops->active == 1)) {
	411	ops->active = 0;
	412	rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
5b5dd21a GS	413	(unsigned long) ops->data, ops->size,
5b5dd21a GS	414	ops->mod_lvl);
1da177e4 LT	415	if (rc != 0) {
	416	P_ERROR("STOP DIAG 0xDC for %s failed, "
	417	"return code: %d\n", ops->name, rc);
	418	} else {
	419	P_INFO("Monitoring %s data disabled, "
	420	"DIAG 0xDC stopped.\n", ops->name);
	421	}
	422	module_put(ops->owner);
	423	}
f26d583e	424	spin_unlock(&appldata_ops_lock);
1da177e4 LT	425	out:
	426	*lenp = len;
	427	*ppos += len;
	428	module_put(ops->owner);
	429	return 0;
	430	}
	431
	432	/************************* /proc stuff <END> *****************************/
	433
	434
	435	/*********************** module-ops management ***************************/
	436	/*
	437	* appldata_register_ops()
	438	*
	439	* update ops list, register /proc/sys entries
	440	*/
	441	int appldata_register_ops(struct appldata_ops *ops)
	442	{
	443	struct list_head *lh;
	444	struct appldata_ops *tmp_ops;
	445	int i;
	446
	447	i = 0;
	448
	449	if ((ops->size > APPLDATA_MAX_REC_SIZE) \|\|
	450	(ops->size < 0)){
	451	P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
	452	ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
	453	return -ENOMEM;
	454	}
	455	if ((ops->ctl_nr == CTL_APPLDATA) \|\|
	456	(ops->ctl_nr == CTL_APPLDATA_TIMER) \|\|
	457	(ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
	458	P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
	459	return -EBUSY;
	460	}
fb630517	461	ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
1da177e4 LT	462	if (ops->ctl_table == NULL) {
	463	P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
	464	return -ENOMEM;
	465	}
1da177e4	466
f26d583e	467	spin_lock(&appldata_ops_lock);
1da177e4 LT	468	list_for_each(lh, &appldata_ops_list) {
	469	tmp_ops = list_entry(lh, struct appldata_ops, list);
	470	P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
	471	++i, tmp_ops->name, tmp_ops->ctl_nr);
	472	P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
	473	tmp_ops->name, tmp_ops->ctl_nr, ops->name,
	474	ops->ctl_nr);
	475	if (strncmp(tmp_ops->name, ops->name,
	476	APPLDATA_PROC_NAME_LENGTH) == 0) {
	477	P_ERROR("Name \"%s\" already registered!\n", ops->name);
	478	kfree(ops->ctl_table);
f26d583e	479	spin_unlock(&appldata_ops_lock);
1da177e4 LT	480	return -EBUSY;
	481	}
	482	if (tmp_ops->ctl_nr == ops->ctl_nr) {
	483	P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
	484	kfree(ops->ctl_table);
f26d583e	485	spin_unlock(&appldata_ops_lock);
1da177e4 LT	486	return -EBUSY;
	487	}
	488	}
	489	list_add(&ops->list, &appldata_ops_list);
f26d583e	490	spin_unlock(&appldata_ops_lock);
1da177e4 LT	491
	492	ops->ctl_table[0].ctl_name = CTL_APPLDATA;
	493	ops->ctl_table[0].procname = appldata_proc_name;
	494	ops->ctl_table[0].maxlen = 0;
	495	ops->ctl_table[0].mode = S_IRUGO \| S_IXUGO;
	496	ops->ctl_table[0].child = &ops->ctl_table[2];
	497
	498	ops->ctl_table[1].ctl_name = 0;
	499
	500	ops->ctl_table[2].ctl_name = ops->ctl_nr;
	501	ops->ctl_table[2].procname = ops->name;
	502	ops->ctl_table[2].mode = S_IRUGO \| S_IWUSR;
	503	ops->ctl_table[2].proc_handler = appldata_generic_handler;
	504	ops->ctl_table[2].data = ops;
	505
	506	ops->ctl_table[3].ctl_name = 0;
	507
	508	ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
	509
	510	P_INFO("%s-ops registered!\n", ops->name);
	511	return 0;
	512	}
	513
	514	/*
	515	* appldata_unregister_ops()
	516	*
	517	* update ops list, unregister /proc entries, stop DIAG if necessary
	518	*/
	519	void appldata_unregister_ops(struct appldata_ops *ops)
	520	{
330d57fb	521	void *table;
f26d583e	522	spin_lock(&appldata_ops_lock);
1da177e4	523	list_del(&ops->list);
330d57fb AV	524	/* at that point any incoming access will fail */
330d57fb AV	525	table = ops->ctl_table;
1da177e4	526	ops->ctl_table = NULL;
f26d583e	527	spin_unlock(&appldata_ops_lock);
330d57fb AV	528	unregister_sysctl_table(ops->sysctl_header);
330d57fb AV	529	kfree(table);
1da177e4 LT	530	P_INFO("%s-ops unregistered!\n", ops->name);
	531	}
	532	/******************** module-ops management <END> ************************/
	533
	534
	535	/***************************** init / exit *******************************/
	536
	537	static void
	538	appldata_online_cpu(int cpu)
	539	{
	540	init_virt_timer(&per_cpu(appldata_timer, cpu));
	541	per_cpu(appldata_timer, cpu).function = appldata_timer_function;
	542	per_cpu(appldata_timer, cpu).data = (unsigned long)
f26d583e	543	&appldata_work;
1da177e4 LT	544	atomic_inc(&appldata_expire_count);
	545	spin_lock(&appldata_timer_lock);
	546	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	547	spin_unlock(&appldata_timer_lock);
	548	}
	549
	550	static void
	551	appldata_offline_cpu(int cpu)
	552	{
	553	del_virt_timer(&per_cpu(appldata_timer, cpu));
	554	if (atomic_dec_and_test(&appldata_expire_count)) {
	555	atomic_set(&appldata_expire_count, num_online_cpus());
f26d583e	556	queue_work(appldata_wq, &appldata_work);
1da177e4 LT	557	}
	558	spin_lock(&appldata_timer_lock);
	559	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	560	spin_unlock(&appldata_timer_lock);
	561	}
	562
be6b5a35	563	#ifdef CONFIG_HOTPLUG_CPU
5cb900a3	564	static int __cpuinit
1da177e4 LT	565	appldata_cpu_notify(struct notifier_block *self,
	566	unsigned long action, void *hcpu)
	567	{
	568	switch (action) {
	569	case CPU_ONLINE:
	570	appldata_online_cpu((long) hcpu);
	571	break;
1da177e4 LT	572	case CPU_DEAD:
	573	appldata_offline_cpu((long) hcpu);
	574	break;
1da177e4 LT	575	default:
	576	break;
	577	}
	578	return NOTIFY_OK;
	579	}
	580
be6b5a35	581	static struct notifier_block appldata_nb = {
1da177e4 LT	582	.notifier_call = appldata_cpu_notify,
1da177e4 LT	583	};
be6b5a35	584	#endif
1da177e4 LT	585
	586	/*
	587	* appldata_init()
	588	*
f26d583e	589	* init timer, register /proc entries
1da177e4 LT	590	*/
	591	static int __init appldata_init(void)
	592	{
	593	int i;
	594
	595	P_DEBUG("sizeof(parameter_list) = %lu\n",
	596	sizeof(struct appldata_parameter_list));
	597
f26d583e GS	598	appldata_wq = create_singlethread_workqueue("appldata");
	599	if (!appldata_wq) {
	600	P_ERROR("Could not create work queue\n");
	601	return -ENOMEM;
	602	}
	603
1da177e4 LT	604	for_each_online_cpu(i)
	605	appldata_online_cpu(i);
	606
	607	/* Register cpu hotplug notifier */
be6b5a35	608	register_hotcpu_notifier(&appldata_nb);
1da177e4 LT	609
	610	appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
	611	#ifdef MODULE
	612	appldata_dir_table[0].de->owner = THIS_MODULE;
	613	appldata_table[0].de->owner = THIS_MODULE;
	614	appldata_table[1].de->owner = THIS_MODULE;
	615	#endif
	616
1da177e4 LT	617	P_DEBUG("Base interface initialized.\n");
	618	return 0;
	619	}
	620
	621	/*
	622	* appldata_exit()
	623	*
f26d583e	624	* stop timer, unregister /proc entries
1da177e4 LT	625	*/
	626	static void __exit appldata_exit(void)
	627	{
	628	struct list_head *lh;
	629	struct appldata_ops *ops;
	630	int rc, i;
	631
	632	P_DEBUG("Unloading module ...\n");
	633	/*
	634	* ops list should be empty, but just in case something went wrong...
	635	*/
f26d583e	636	spin_lock(&appldata_ops_lock);
1da177e4 LT	637	list_for_each(lh, &appldata_ops_list) {
	638	ops = list_entry(lh, struct appldata_ops, list);
	639	rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
5b5dd21a GS	640	(unsigned long) ops->data, ops->size,
5b5dd21a GS	641	ops->mod_lvl);
1da177e4 LT	642	if (rc != 0) {
	643	P_ERROR("STOP DIAG 0xDC for %s failed, "
	644	"return code: %d\n", ops->name, rc);
	645	}
	646	}
f26d583e	647	spin_unlock(&appldata_ops_lock);
1da177e4 LT	648
	649	for_each_online_cpu(i)
	650	appldata_offline_cpu(i);
	651
	652	appldata_timer_active = 0;
	653
	654	unregister_sysctl_table(appldata_sysctl_header);
	655
f26d583e	656	destroy_workqueue(appldata_wq);
1da177e4 LT	657	P_DEBUG("... module unloaded!\n");
	658	}
	659	/************************** init / exit <END> ****************************/
	660
	661
	662	module_init(appldata_init);
	663	module_exit(appldata_exit);
	664	MODULE_LICENSE("GPL");
	665	MODULE_AUTHOR("Gerald Schaefer");
	666	MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
	667
	668	EXPORT_SYMBOL_GPL(appldata_register_ops);
	669	EXPORT_SYMBOL_GPL(appldata_unregister_ops);
5b5dd21a	670	EXPORT_SYMBOL_GPL(appldata_diag);
1da177e4 LT	671
	672	#ifdef MODULE
	673	/*
	674	* Kernel symbols needed by appldata_mem and appldata_os modules.
	675	* However, if this file is compiled as a module (for testing only), these
	676	* symbols are not exported. In this case, we define them locally and export
	677	* those.
	678	*/
	679	void si_swapinfo(struct sysinfo *val)
	680	{
	681	val->freeswap = -1ul;
	682	val->totalswap = -1ul;
	683	}
	684
	685	unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
	686	-1 - FIXED_1/200};
	687	int nr_threads = -1;
	688
	689	void get_full_page_state(struct page_state *ps)
	690	{
	691	memset(ps, -1, sizeof(struct page_state));
	692	}
	693
	694	unsigned long nr_running(void)
	695	{
	696	return -1;
	697	}
	698
	699	unsigned long nr_iowait(void)
	700	{
	701	return -1;
	702	}
	703
	704	/*unsigned long nr_context_switches(void)
	705	{
	706	return -1;
	707	}*/
	708	#endif /* MODULE */
	709	EXPORT_SYMBOL_GPL(si_swapinfo);
	710	EXPORT_SYMBOL_GPL(nr_threads);
1da177e4 LT	711	EXPORT_SYMBOL_GPL(nr_running);
	712	EXPORT_SYMBOL_GPL(nr_iowait);
	713	//EXPORT_SYMBOL_GPL(nr_context_switches);