summaryrefslogtreecommitdiff
path: root/arch/s390/appldata/appldata_base.c
blob: 3b0994625652a6867acd35dc25265e00e00a3e23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
// SPDX-License-Identifier: GPL-2.0
/*
 * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
 * Exports appldata_register_ops() and appldata_unregister_ops() for the
 * data gathering modules.
 *
 * Copyright IBM Corp. 2003, 2009
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#define KMSG_COMPONENT	"appldata"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/sched/stat.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 <linux/uaccess.h>
#include <linux/io.h>
#include <asm/appldata.h>
#include <asm/vtimer.h>
#include <asm/smp.h>

#include "appldata.h"


#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(struct ctl_table *ctl, int write,
				  void *buffer, size_t *lenp, loff_t *ppos);
static int appldata_interval_handler(struct ctl_table *ctl, int write,
				     void *buffer, size_t *lenp, loff_t *ppos);

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

/*
 * Timer
 */
static struct vtimer_list appldata_timer;

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(struct work_struct *work);
static DECLARE_WORK(appldata_work, appldata_work_fn);


/*
 * Ops list
 */
static DEFINE_MUTEX(appldata_ops_mutex);
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)
{
	queue_work(appldata_wq, (struct work_struct *) data);
}

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

	mutex_lock(&appldata_ops_mutex);
	list_for_each(lh, &appldata_ops_list) {
		ops = list_entry(lh, struct appldata_ops, list);
		if (ops->active == 1) {
			ops->callback(ops->data);
		}
	}
	mutex_unlock(&appldata_ops_mutex);
}

static struct appldata_product_id appldata_id = {
	.prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
		       0xE7, 0xD2, 0xD9},	/* "LINUXKR" */
	.prod_fn    = 0xD5D3,			/* "NL" */
	.version_nr = 0xF2F6,			/* "26" */
	.release_nr = 0xF0F1,			/* "01" */
};

/*
 * 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_parameter_list *parm_list;
	struct appldata_product_id *id;
	int rc;

	parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL);
	id = kmemdup(&appldata_id, sizeof(appldata_id), GFP_KERNEL);
	rc = -ENOMEM;
	if (parm_list && id) {
		id->record_nr = record_nr;
		id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
		rc = appldata_asm(parm_list, id, function,
				  (void *) buffer, length);
	}
	kfree(id);
	kfree(parm_list);
	return rc;
}
/************************ timer, work, DIAG <END> ****************************/


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

#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 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO;

	switch (cmd) {
	case APPLDATA_ADD_TIMER:
		if (appldata_timer_active)
			break;
		appldata_timer.expires = timer_interval;
		add_virt_timer_periodic(&appldata_timer);
		appldata_timer_active = 1;
		break;
	case APPLDATA_DEL_TIMER:
		del_virt_timer(&appldata_timer);
		if (!appldata_timer_active)
			break;
		appldata_timer_active = 0;
		break;
	case APPLDATA_MOD_TIMER:
		if (!appldata_timer_active)
			break;
		mod_virt_timer_periodic(&appldata_timer, timer_interval);
	}
}

/*
 * appldata_timer_handler()
 *
 * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 */
static int
appldata_timer_handler(struct ctl_table *ctl, int write,
			   void *buffer, size_t *lenp, loff_t *ppos)
{
	int timer_active = appldata_timer_active;
	int rc;
	struct ctl_table ctl_entry = {
		.procname	= ctl->procname,
		.data		= &timer_active,
		.maxlen		= sizeof(int),
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_ONE,
	};

	rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	if (rc < 0 || !write)
		return rc;

	spin_lock(&appldata_timer_lock);
	if (timer_active)
		__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
	else
		__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
	spin_unlock(&appldata_timer_lock);
	return 0;
}

/*
 * appldata_interval_handler()
 *
 * Set (CPU) timer interval for collection of data (in milliseconds), show
 * current timer interval.
 */
static int
appldata_interval_handler(struct ctl_table *ctl, int write,
			   void *buffer, size_t *lenp, loff_t *ppos)
{
	int interval = appldata_interval;
	int rc;
	struct ctl_table ctl_entry = {
		.procname	= ctl->procname,
		.data		= &interval,
		.maxlen		= sizeof(int),
		.extra1		= SYSCTL_ONE,
	};

	rc = proc_dointvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	if (rc < 0 || !write)
		return rc;

	spin_lock(&appldata_timer_lock);
	appldata_interval = interval;
	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	spin_unlock(&appldata_timer_lock);
	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(struct ctl_table *ctl, int write,
			   void *buffer, size_t *lenp, loff_t *ppos)
{
	struct appldata_ops *ops = NULL, *tmp_ops;
	struct list_head *lh;
	int rc, found;
	int active;
	struct ctl_table ctl_entry = {
		.data		= &active,
		.maxlen		= sizeof(int),
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_ONE,
	};

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

	active = ops->active;
	rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	if (rc < 0 || !write) {
		module_put(ops->owner);
		return rc;
	}

	mutex_lock(&appldata_ops_mutex);
	if (active && (ops->active == 0)) {
		// protect work queue callback
		if (!try_module_get(ops->owner)) {
			mutex_unlock(&appldata_ops_mutex);
			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) {
			pr_err("Starting the data collection for %s "
			       "failed with rc=%d\n", ops->name, rc);
			module_put(ops->owner);
		} else
			ops->active = 1;
	} else if (!active && (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)
			pr_err("Stopping the data collection for %s "
			       "failed with rc=%d\n", ops->name, rc);
		module_put(ops->owner);
	}
	mutex_unlock(&appldata_ops_mutex);
	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)
{
	if (ops->size > APPLDATA_MAX_REC_SIZE)
		return -EINVAL;

	/* The last entry must be an empty one */
	ops->ctl_table = kcalloc(2, sizeof(struct ctl_table), GFP_KERNEL);
	if (!ops->ctl_table)
		return -ENOMEM;

	mutex_lock(&appldata_ops_mutex);
	list_add(&ops->list, &appldata_ops_list);
	mutex_unlock(&appldata_ops_mutex);

	ops->ctl_table[0].procname = ops->name;
	ops->ctl_table[0].mode = S_IRUGO | S_IWUSR;
	ops->ctl_table[0].proc_handler = appldata_generic_handler;
	ops->ctl_table[0].data = ops;

	ops->sysctl_header = register_sysctl_sz(appldata_proc_name, ops->ctl_table, 1);
	if (!ops->sysctl_header)
		goto out;
	return 0;
out:
	mutex_lock(&appldata_ops_mutex);
	list_del(&ops->list);
	mutex_unlock(&appldata_ops_mutex);
	kfree(ops->ctl_table);
	return -ENOMEM;
}

/*
 * appldata_unregister_ops()
 *
 * update ops list, unregister /proc entries, stop DIAG if necessary
 */
void appldata_unregister_ops(struct appldata_ops *ops)
{
	mutex_lock(&appldata_ops_mutex);
	list_del(&ops->list);
	mutex_unlock(&appldata_ops_mutex);
	unregister_sysctl_table(ops->sysctl_header);
	kfree(ops->ctl_table);
}
/********************** module-ops management <END> **************************/


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

/*
 * appldata_init()
 *
 * init timer, register /proc entries
 */
static int __init appldata_init(void)
{
	init_virt_timer(&appldata_timer);
	appldata_timer.function = appldata_timer_function;
	appldata_timer.data = (unsigned long) &appldata_work;
	appldata_wq = alloc_ordered_workqueue("appldata", 0);
	if (!appldata_wq)
		return -ENOMEM;
	appldata_sysctl_header = register_sysctl(appldata_proc_name, appldata_table);
	return 0;
}

__initcall(appldata_init);

/**************************** init / exit <END> ******************************/

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

#ifdef CONFIG_SWAP
EXPORT_SYMBOL_GPL(si_swapinfo);
#endif
EXPORT_SYMBOL_GPL(nr_threads);
EXPORT_SYMBOL_GPL(nr_running);
EXPORT_SYMBOL_GPL(nr_iowait);