xref: /linux/arch/s390/appldata/appldata_base.c (revision 5e8d780d745c1619aba81fe7166c5a4b5cad2b84) 
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  *
8  * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
9  *
10  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
11  */
12 
13 #include <linux/config.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/errno.h>
18 #include <asm/uaccess.h>
19 #include <asm/io.h>
20 #include <asm/smp.h>
21 #include <linux/interrupt.h>
22 #include <linux/proc_fs.h>
23 #include <linux/page-flags.h>
24 #include <linux/swap.h>
25 #include <linux/pagemap.h>
26 #include <linux/sysctl.h>
27 #include <asm/timer.h>
28 //#include <linux/kernel_stat.h>
29 #include <linux/notifier.h>
30 #include <linux/cpu.h>
31 #include <linux/workqueue.h>
32 
33 #include "appldata.h"
34 
35 
36 #define MY_PRINT_NAME	"appldata"		/* for debug messages, etc. */
37 #define APPLDATA_CPU_INTERVAL	10000		/* default (CPU) time for
38 						   sampling interval in
39 						   milliseconds */
40 
41 #define TOD_MICRO	0x01000			/* nr. of TOD clock units
42 						   for 1 microsecond */
43 
44 /*
45  * Parameter list for DIAGNOSE X'DC'
46  */
47 #ifndef CONFIG_64BIT
48 struct appldata_parameter_list {
49 	u16 diag;		/* The DIAGNOSE code X'00DC'          */
50 	u8  function;		/* The function code for the DIAGNOSE */
51 	u8  parlist_length;	/* Length of the parameter list       */
52 	u32 product_id_addr;	/* Address of the 16-byte product ID  */
53 	u16 reserved;
54 	u16 buffer_length;	/* Length of the application data buffer  */
55 	u32 buffer_addr;	/* Address of the application data buffer */
56 };
57 #else
58 struct appldata_parameter_list {
59 	u16 diag;
60 	u8  function;
61 	u8  parlist_length;
62 	u32 unused01;
63 	u16 reserved;
64 	u16 buffer_length;
65 	u32 unused02;
66 	u64 product_id_addr;
67 	u64 buffer_addr;
68 };
69 #endif /* CONFIG_64BIT */
70 
71 /*
72  * /proc entries (sysctl)
73  */
74 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
75 static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
76 				  void __user *buffer, size_t *lenp, loff_t *ppos);
77 static int appldata_interval_handler(ctl_table *ctl, int write,
78 					 struct file *filp,
79 					 void __user *buffer,
80 					 size_t *lenp, loff_t *ppos);
81 
82 static struct ctl_table_header *appldata_sysctl_header;
83 static struct ctl_table appldata_table[] = {
84 	{
85 		.ctl_name	= CTL_APPLDATA_TIMER,
86 		.procname	= "timer",
87 		.mode		= S_IRUGO | S_IWUSR,
88 		.proc_handler	= &appldata_timer_handler,
89 	},
90 	{
91 		.ctl_name	= CTL_APPLDATA_INTERVAL,
92 		.procname	= "interval",
93 		.mode		= S_IRUGO | S_IWUSR,
94 		.proc_handler	= &appldata_interval_handler,
95 	},
96 	{ .ctl_name = 0 }
97 };
98 
99 static struct ctl_table appldata_dir_table[] = {
100 	{
101 		.ctl_name	= CTL_APPLDATA,
102 		.procname	= appldata_proc_name,
103 		.maxlen		= 0,
104 		.mode		= S_IRUGO | S_IXUGO,
105 		.child		= appldata_table,
106 	},
107 	{ .ctl_name = 0 }
108 };
109 
110 /*
111  * Timer
112  */
113 DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
114 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
115 
116 static DEFINE_SPINLOCK(appldata_timer_lock);
117 static int appldata_interval = APPLDATA_CPU_INTERVAL;
118 static int appldata_timer_active;
119 
120 /*
121  * Work queue
122  */
123 static struct workqueue_struct *appldata_wq;
124 static void appldata_work_fn(void *data);
125 static DECLARE_WORK(appldata_work, appldata_work_fn, NULL);
126 
127 
128 /*
129  * Ops list
130  */
131 static DEFINE_SPINLOCK(appldata_ops_lock);
132 static LIST_HEAD(appldata_ops_list);
133 
134 
135 /*************************** timer, work, DIAG *******************************/
136 /*
137  * appldata_timer_function()
138  *
139  * schedule work and reschedule timer
140  */
141 static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
142 {
143 	P_DEBUG("   -= Timer =-\n");
144 	P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
145 		atomic_read(&appldata_expire_count));
146 	if (atomic_dec_and_test(&appldata_expire_count)) {
147 		atomic_set(&appldata_expire_count, num_online_cpus());
148 		queue_work(appldata_wq, (struct work_struct *) data);
149 	}
150 }
151 
152 /*
153  * appldata_work_fn()
154  *
155  * call data gathering function for each (active) module
156  */
157 static void appldata_work_fn(void *data)
158 {
159 	struct list_head *lh;
160 	struct appldata_ops *ops;
161 	int i;
162 
163 	P_DEBUG("  -= Work Queue =-\n");
164 	i = 0;
165 	spin_lock(&appldata_ops_lock);
166 	list_for_each(lh, &appldata_ops_list) {
167 		ops = list_entry(lh, struct appldata_ops, list);
168 		P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
169 			++i, ops->active, ops->name);
170 		if (ops->active == 1) {
171 			ops->callback(ops->data);
172 		}
173 	}
174 	spin_unlock(&appldata_ops_lock);
175 }
176 
177 /*
178  * appldata_diag()
179  *
180  * prepare parameter list, issue DIAG 0xDC
181  */
182 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
183 			u16 length, char *mod_lvl)
184 {
185 	unsigned long ry;
186 	struct appldata_product_id {
187 		char prod_nr[7];			/* product nr. */
188 		char prod_fn[2];			/* product function */
189 		char record_nr;				/* record nr. */
190 		char version_nr[2];			/* version */
191 		char release_nr[2];			/* release */
192 		char mod_lvl[2];			/* modification lvl. */
193 	} appldata_product_id = {
194 	/* all strings are EBCDIC, record_nr is byte */
195 		.prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
196 				0xE7, 0xD2, 0xD9},	/* "LINUXKR" */
197 		.prod_fn    = {0xD5, 0xD3},		/* "NL" */
198 		.record_nr  = record_nr,
199 		.version_nr = {0xF2, 0xF6},		/* "26" */
200 		.release_nr = {0xF0, 0xF1},		/* "01" */
201 		.mod_lvl    = {mod_lvl[0], mod_lvl[1]},
202 	};
203 	struct appldata_parameter_list appldata_parameter_list = {
204 				.diag = 0xDC,
205 				.function = function,
206 				.parlist_length =
207 					sizeof(appldata_parameter_list),
208 				.buffer_length = length,
209 				.product_id_addr =
210 					(unsigned long) &appldata_product_id,
211 				.buffer_addr = virt_to_phys((void *) buffer)
212 	};
213 
214 	if (!MACHINE_IS_VM)
215 		return -ENOSYS;
216 	ry = -1;
217 	asm volatile(
218 			"diag %1,%0,0xDC\n\t"
219 			: "=d" (ry)
220 			: "d" (&appldata_parameter_list),
221 			  "m" (appldata_parameter_list),
222 			  "m" (appldata_product_id)
223 			: "cc");
224 	return (int) ry;
225 }
226 /************************ timer, work, DIAG <END> ****************************/
227 
228 
229 /****************************** /proc stuff **********************************/
230 
231 /*
232  * appldata_mod_vtimer_wrap()
233  *
234  * wrapper function for mod_virt_timer(), because smp_call_function_on()
235  * accepts only one parameter.
236  */
237 static void __appldata_mod_vtimer_wrap(void *p) {
238 	struct {
239 		struct vtimer_list *timer;
240 		u64    expires;
241 	} *args = p;
242 	mod_virt_timer(args->timer, args->expires);
243 }
244 
245 #define APPLDATA_ADD_TIMER	0
246 #define APPLDATA_DEL_TIMER	1
247 #define APPLDATA_MOD_TIMER	2
248 
249 /*
250  * __appldata_vtimer_setup()
251  *
252  * Add, delete or modify virtual timers on all online cpus.
253  * The caller needs to get the appldata_timer_lock spinlock.
254  */
255 static void
256 __appldata_vtimer_setup(int cmd)
257 {
258 	u64 per_cpu_interval;
259 	int i;
260 
261 	switch (cmd) {
262 	case APPLDATA_ADD_TIMER:
263 		if (appldata_timer_active)
264 			break;
265 		per_cpu_interval = (u64) (appldata_interval*1000 /
266 					  num_online_cpus()) * TOD_MICRO;
267 		for_each_online_cpu(i) {
268 			per_cpu(appldata_timer, i).expires = per_cpu_interval;
269 			smp_call_function_on(add_virt_timer_periodic,
270 					     &per_cpu(appldata_timer, i),
271 					     0, 1, i);
272 		}
273 		appldata_timer_active = 1;
274 		P_INFO("Monitoring timer started.\n");
275 		break;
276 	case APPLDATA_DEL_TIMER:
277 		for_each_online_cpu(i)
278 			del_virt_timer(&per_cpu(appldata_timer, i));
279 		if (!appldata_timer_active)
280 			break;
281 		appldata_timer_active = 0;
282 		atomic_set(&appldata_expire_count, num_online_cpus());
283 		P_INFO("Monitoring timer stopped.\n");
284 		break;
285 	case APPLDATA_MOD_TIMER:
286 		per_cpu_interval = (u64) (appldata_interval*1000 /
287 					  num_online_cpus()) * TOD_MICRO;
288 		if (!appldata_timer_active)
289 			break;
290 		for_each_online_cpu(i) {
291 			struct {
292 				struct vtimer_list *timer;
293 				u64    expires;
294 			} args;
295 			args.timer = &per_cpu(appldata_timer, i);
296 			args.expires = per_cpu_interval;
297 			smp_call_function_on(__appldata_mod_vtimer_wrap,
298 					     &args, 0, 1, i);
299 		}
300 	}
301 }
302 
303 /*
304  * appldata_timer_handler()
305  *
306  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
307  */
308 static int
309 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
310 			   void __user *buffer, size_t *lenp, loff_t *ppos)
311 {
312 	int len;
313 	char buf[2];
314 
315 	if (!*lenp || *ppos) {
316 		*lenp = 0;
317 		return 0;
318 	}
319 	if (!write) {
320 		len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
321 		if (len > *lenp)
322 			len = *lenp;
323 		if (copy_to_user(buffer, buf, len))
324 			return -EFAULT;
325 		goto out;
326 	}
327 	len = *lenp;
328 	if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
329 		return -EFAULT;
330 	spin_lock(&appldata_timer_lock);
331 	if (buf[0] == '1')
332 		__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
333 	else if (buf[0] == '0')
334 		__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
335 	spin_unlock(&appldata_timer_lock);
336 out:
337 	*lenp = len;
338 	*ppos += len;
339 	return 0;
340 }
341 
342 /*
343  * appldata_interval_handler()
344  *
345  * Set (CPU) timer interval for collection of data (in milliseconds), show
346  * current timer interval.
347  */
348 static int
349 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
350 			   void __user *buffer, size_t *lenp, loff_t *ppos)
351 {
352 	int len, interval;
353 	char buf[16];
354 
355 	if (!*lenp || *ppos) {
356 		*lenp = 0;
357 		return 0;
358 	}
359 	if (!write) {
360 		len = sprintf(buf, "%i\n", appldata_interval);
361 		if (len > *lenp)
362 			len = *lenp;
363 		if (copy_to_user(buffer, buf, len))
364 			return -EFAULT;
365 		goto out;
366 	}
367 	len = *lenp;
368 	if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
369 		return -EFAULT;
370 	}
371 	sscanf(buf, "%i", &interval);
372 	if (interval <= 0) {
373 		P_ERROR("Timer CPU interval has to be > 0!\n");
374 		return -EINVAL;
375 	}
376 
377 	spin_lock(&appldata_timer_lock);
378 	appldata_interval = interval;
379 	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
380 	spin_unlock(&appldata_timer_lock);
381 
382 	P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
383 		 interval);
384 out:
385 	*lenp = len;
386 	*ppos += len;
387 	return 0;
388 }
389 
390 /*
391  * appldata_generic_handler()
392  *
393  * Generic start/stop monitoring and DIAG, show status of
394  * monitoring (0 = not in process, 1 = in process)
395  */
396 static int
397 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
398 			   void __user *buffer, size_t *lenp, loff_t *ppos)
399 {
400 	struct appldata_ops *ops = NULL, *tmp_ops;
401 	int rc, len, found;
402 	char buf[2];
403 	struct list_head *lh;
404 
405 	found = 0;
406 	spin_lock(&appldata_ops_lock);
407 	list_for_each(lh, &appldata_ops_list) {
408 		tmp_ops = list_entry(lh, struct appldata_ops, list);
409 		if (&tmp_ops->ctl_table[2] == ctl) {
410 			found = 1;
411 		}
412 	}
413 	if (!found) {
414 		spin_unlock(&appldata_ops_lock);
415 		return -ENODEV;
416 	}
417 	ops = ctl->data;
418 	if (!try_module_get(ops->owner)) {	// protect this function
419 		spin_unlock(&appldata_ops_lock);
420 		return -ENODEV;
421 	}
422 	spin_unlock(&appldata_ops_lock);
423 
424 	if (!*lenp || *ppos) {
425 		*lenp = 0;
426 		module_put(ops->owner);
427 		return 0;
428 	}
429 	if (!write) {
430 		len = sprintf(buf, ops->active ? "1\n" : "0\n");
431 		if (len > *lenp)
432 			len = *lenp;
433 		if (copy_to_user(buffer, buf, len)) {
434 			module_put(ops->owner);
435 			return -EFAULT;
436 		}
437 		goto out;
438 	}
439 	len = *lenp;
440 	if (copy_from_user(buf, buffer,
441 			   len > sizeof(buf) ? sizeof(buf) : len)) {
442 		module_put(ops->owner);
443 		return -EFAULT;
444 	}
445 
446 	spin_lock(&appldata_ops_lock);
447 	if ((buf[0] == '1') && (ops->active == 0)) {
448 		// protect work queue callback
449 		if (!try_module_get(ops->owner)) {
450 			spin_unlock(&appldata_ops_lock);
451 			module_put(ops->owner);
452 			return -ENODEV;
453 		}
454 		ops->callback(ops->data);	// init record
455 		rc = appldata_diag(ops->record_nr,
456 					APPLDATA_START_INTERVAL_REC,
457 					(unsigned long) ops->data, ops->size,
458 					ops->mod_lvl);
459 		if (rc != 0) {
460 			P_ERROR("START DIAG 0xDC for %s failed, "
461 				"return code: %d\n", ops->name, rc);
462 			module_put(ops->owner);
463 		} else {
464 			P_INFO("Monitoring %s data enabled, "
465 				"DIAG 0xDC started.\n", ops->name);
466 			ops->active = 1;
467 		}
468 	} else if ((buf[0] == '0') && (ops->active == 1)) {
469 		ops->active = 0;
470 		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
471 				(unsigned long) ops->data, ops->size,
472 				ops->mod_lvl);
473 		if (rc != 0) {
474 			P_ERROR("STOP DIAG 0xDC for %s failed, "
475 				"return code: %d\n", ops->name, rc);
476 		} else {
477 			P_INFO("Monitoring %s data disabled, "
478 				"DIAG 0xDC stopped.\n", ops->name);
479 		}
480 		module_put(ops->owner);
481 	}
482 	spin_unlock(&appldata_ops_lock);
483 out:
484 	*lenp = len;
485 	*ppos += len;
486 	module_put(ops->owner);
487 	return 0;
488 }
489 
490 /*************************** /proc stuff <END> *******************************/
491 
492 
493 /************************* module-ops management *****************************/
494 /*
495  * appldata_register_ops()
496  *
497  * update ops list, register /proc/sys entries
498  */
499 int appldata_register_ops(struct appldata_ops *ops)
500 {
501 	struct list_head *lh;
502 	struct appldata_ops *tmp_ops;
503 	int i;
504 
505 	i = 0;
506 
507 	if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
508 		(ops->size < 0)){
509 		P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
510 			ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
511 		return -ENOMEM;
512 	}
513 	if ((ops->ctl_nr == CTL_APPLDATA) ||
514 	    (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
515 	    (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
516 		P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
517 		return -EBUSY;
518 	}
519 	ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
520 	if (ops->ctl_table == NULL) {
521 		P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
522 		return -ENOMEM;
523 	}
524 
525 	spin_lock(&appldata_ops_lock);
526 	list_for_each(lh, &appldata_ops_list) {
527 		tmp_ops = list_entry(lh, struct appldata_ops, list);
528 		P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
529 			++i, tmp_ops->name, tmp_ops->ctl_nr);
530 		P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
531 			tmp_ops->name, tmp_ops->ctl_nr, ops->name,
532 			ops->ctl_nr);
533 		if (strncmp(tmp_ops->name, ops->name,
534 				APPLDATA_PROC_NAME_LENGTH) == 0) {
535 			P_ERROR("Name \"%s\" already registered!\n", ops->name);
536 			kfree(ops->ctl_table);
537 			spin_unlock(&appldata_ops_lock);
538 			return -EBUSY;
539 		}
540 		if (tmp_ops->ctl_nr == ops->ctl_nr) {
541 			P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
542 			kfree(ops->ctl_table);
543 			spin_unlock(&appldata_ops_lock);
544 			return -EBUSY;
545 		}
546 	}
547 	list_add(&ops->list, &appldata_ops_list);
548 	spin_unlock(&appldata_ops_lock);
549 
550 	ops->ctl_table[0].ctl_name = CTL_APPLDATA;
551 	ops->ctl_table[0].procname = appldata_proc_name;
552 	ops->ctl_table[0].maxlen   = 0;
553 	ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
554 	ops->ctl_table[0].child    = &ops->ctl_table[2];
555 
556 	ops->ctl_table[1].ctl_name = 0;
557 
558 	ops->ctl_table[2].ctl_name = ops->ctl_nr;
559 	ops->ctl_table[2].procname = ops->name;
560 	ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
561 	ops->ctl_table[2].proc_handler = appldata_generic_handler;
562 	ops->ctl_table[2].data = ops;
563 
564 	ops->ctl_table[3].ctl_name = 0;
565 
566 	ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
567 
568 	P_INFO("%s-ops registered!\n", ops->name);
569 	return 0;
570 }
571 
572 /*
573  * appldata_unregister_ops()
574  *
575  * update ops list, unregister /proc entries, stop DIAG if necessary
576  */
577 void appldata_unregister_ops(struct appldata_ops *ops)
578 {
579 	void *table;
580 	spin_lock(&appldata_ops_lock);
581 	list_del(&ops->list);
582 	/* at that point any incoming access will fail */
583 	table = ops->ctl_table;
584 	ops->ctl_table = NULL;
585 	spin_unlock(&appldata_ops_lock);
586 	unregister_sysctl_table(ops->sysctl_header);
587 	kfree(table);
588 	P_INFO("%s-ops unregistered!\n", ops->name);
589 }
590 /********************** module-ops management <END> **************************/
591 
592 
593 /******************************* init / exit *********************************/
594 
595 static void
596 appldata_online_cpu(int cpu)
597 {
598 	init_virt_timer(&per_cpu(appldata_timer, cpu));
599 	per_cpu(appldata_timer, cpu).function = appldata_timer_function;
600 	per_cpu(appldata_timer, cpu).data = (unsigned long)
601 		&appldata_work;
602 	atomic_inc(&appldata_expire_count);
603 	spin_lock(&appldata_timer_lock);
604 	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
605 	spin_unlock(&appldata_timer_lock);
606 }
607 
608 static void
609 appldata_offline_cpu(int cpu)
610 {
611 	del_virt_timer(&per_cpu(appldata_timer, cpu));
612 	if (atomic_dec_and_test(&appldata_expire_count)) {
613 		atomic_set(&appldata_expire_count, num_online_cpus());
614 		queue_work(appldata_wq, &appldata_work);
615 	}
616 	spin_lock(&appldata_timer_lock);
617 	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
618 	spin_unlock(&appldata_timer_lock);
619 }
620 
621 static int __cpuinit
622 appldata_cpu_notify(struct notifier_block *self,
623 		    unsigned long action, void *hcpu)
624 {
625 	switch (action) {
626 	case CPU_ONLINE:
627 		appldata_online_cpu((long) hcpu);
628 		break;
629 #ifdef CONFIG_HOTPLUG_CPU
630 	case CPU_DEAD:
631 		appldata_offline_cpu((long) hcpu);
632 		break;
633 #endif
634 	default:
635 		break;
636 	}
637 	return NOTIFY_OK;
638 }
639 
640 static struct notifier_block __devinitdata appldata_nb = {
641 	.notifier_call = appldata_cpu_notify,
642 };
643 
644 /*
645  * appldata_init()
646  *
647  * init timer, register /proc entries
648  */
649 static int __init appldata_init(void)
650 {
651 	int i;
652 
653 	P_DEBUG("sizeof(parameter_list) = %lu\n",
654 		sizeof(struct appldata_parameter_list));
655 
656 	appldata_wq = create_singlethread_workqueue("appldata");
657 	if (!appldata_wq) {
658 		P_ERROR("Could not create work queue\n");
659 		return -ENOMEM;
660 	}
661 
662 	for_each_online_cpu(i)
663 		appldata_online_cpu(i);
664 
665 	/* Register cpu hotplug notifier */
666 	register_cpu_notifier(&appldata_nb);
667 
668 	appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
669 #ifdef MODULE
670 	appldata_dir_table[0].de->owner = THIS_MODULE;
671 	appldata_table[0].de->owner = THIS_MODULE;
672 	appldata_table[1].de->owner = THIS_MODULE;
673 #endif
674 
675 	P_DEBUG("Base interface initialized.\n");
676 	return 0;
677 }
678 
679 /*
680  * appldata_exit()
681  *
682  * stop timer, unregister /proc entries
683  */
684 static void __exit appldata_exit(void)
685 {
686 	struct list_head *lh;
687 	struct appldata_ops *ops;
688 	int rc, i;
689 
690 	P_DEBUG("Unloading module ...\n");
691 	/*
692 	 * ops list should be empty, but just in case something went wrong...
693 	 */
694 	spin_lock(&appldata_ops_lock);
695 	list_for_each(lh, &appldata_ops_list) {
696 		ops = list_entry(lh, struct appldata_ops, list);
697 		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
698 				(unsigned long) ops->data, ops->size,
699 				ops->mod_lvl);
700 		if (rc != 0) {
701 			P_ERROR("STOP DIAG 0xDC for %s failed, "
702 				"return code: %d\n", ops->name, rc);
703 		}
704 	}
705 	spin_unlock(&appldata_ops_lock);
706 
707 	for_each_online_cpu(i)
708 		appldata_offline_cpu(i);
709 
710 	appldata_timer_active = 0;
711 
712 	unregister_sysctl_table(appldata_sysctl_header);
713 
714 	destroy_workqueue(appldata_wq);
715 	P_DEBUG("... module unloaded!\n");
716 }
717 /**************************** init / exit <END> ******************************/
718 
719 
720 module_init(appldata_init);
721 module_exit(appldata_exit);
722 MODULE_LICENSE("GPL");
723 MODULE_AUTHOR("Gerald Schaefer");
724 MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
725 
726 EXPORT_SYMBOL_GPL(appldata_register_ops);
727 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
728 EXPORT_SYMBOL_GPL(appldata_diag);
729 
730 #ifdef MODULE
731 /*
732  * Kernel symbols needed by appldata_mem and appldata_os modules.
733  * However, if this file is compiled as a module (for testing only), these
734  * symbols are not exported. In this case, we define them locally and export
735  * those.
736  */
737 void si_swapinfo(struct sysinfo *val)
738 {
739 	val->freeswap = -1ul;
740 	val->totalswap = -1ul;
741 }
742 
743 unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
744 				-1 - FIXED_1/200};
745 int nr_threads = -1;
746 
747 void get_full_page_state(struct page_state *ps)
748 {
749 	memset(ps, -1, sizeof(struct page_state));
750 }
751 
752 unsigned long nr_running(void)
753 {
754 	return -1;
755 }
756 
757 unsigned long nr_iowait(void)
758 {
759 	return -1;
760 }
761 
762 /*unsigned long nr_context_switches(void)
763 {
764 	return -1;
765 }*/
766 #endif /* MODULE */
767 EXPORT_SYMBOL_GPL(si_swapinfo);
768 EXPORT_SYMBOL_GPL(nr_threads);
769 EXPORT_SYMBOL_GPL(nr_running);
770 EXPORT_SYMBOL_GPL(nr_iowait);
771 //EXPORT_SYMBOL_GPL(nr_context_switches);
772