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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
4 * Exports appldata_register_ops() and appldata_unregister_ops() for the
5 * data gathering modules.
6 *
7 * Copyright IBM Corp. 2003, 2009
8 *
9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "appldata"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/sched/stat.h>
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/errno.h>
20 #include <linux/interrupt.h>
21 #include <linux/proc_fs.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/pagemap.h>
25 #include <linux/sysctl.h>
26 #include <linux/notifier.h>
27 #include <linux/cpu.h>
28 #include <linux/workqueue.h>
29 #include <linux/suspend.h>
30 #include <linux/platform_device.h>
31 #include <asm/appldata.h>
32 #include <asm/vtimer.h>
33 #include <linux/uaccess.h>
34 #include <asm/io.h>
35 #include <asm/smp.h>
36
37 #include "appldata.h"
38
39
40 #define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for
41 sampling interval in
42 milliseconds */
43
44 #define TOD_MICRO 0x01000 /* nr. of TOD clock units
45 for 1 microsecond */
46
47 static struct platform_device *appldata_pdev;
48
49 /*
50 * /proc entries (sysctl)
51 */
52 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
53 static int appldata_timer_handler(struct ctl_table *ctl, int write,
54 void __user *buffer, size_t *lenp, loff_t *ppos);
55 static int appldata_interval_handler(struct ctl_table *ctl, int write,
56 void __user *buffer,
57 size_t *lenp, loff_t *ppos);
58
59 static struct ctl_table_header *appldata_sysctl_header;
60 static struct ctl_table appldata_table[] = {
61 {
62 .procname = "timer",
63 .mode = S_IRUGO | S_IWUSR,
64 .proc_handler = appldata_timer_handler,
65 },
66 {
67 .procname = "interval",
68 .mode = S_IRUGO | S_IWUSR,
69 .proc_handler = appldata_interval_handler,
70 },
71 { },
72 };
73
74 static struct ctl_table appldata_dir_table[] = {
75 {
76 .procname = appldata_proc_name,
77 .maxlen = 0,
78 .mode = S_IRUGO | S_IXUGO,
79 .child = appldata_table,
80 },
81 { },
82 };
83
84 /*
85 * Timer
86 */
87 static struct vtimer_list appldata_timer;
88
89 static DEFINE_SPINLOCK(appldata_timer_lock);
90 static int appldata_interval = APPLDATA_CPU_INTERVAL;
91 static int appldata_timer_active;
92 static int appldata_timer_suspended = 0;
93
94 /*
95 * Work queue
96 */
97 static struct workqueue_struct *appldata_wq;
98 static void appldata_work_fn(struct work_struct *work);
99 static DECLARE_WORK(appldata_work, appldata_work_fn);
100
101
102 /*
103 * Ops list
104 */
105 static DEFINE_MUTEX(appldata_ops_mutex);
106 static LIST_HEAD(appldata_ops_list);
107
108
109 /*************************** timer, work, DIAG *******************************/
110 /*
111 * appldata_timer_function()
112 *
113 * schedule work and reschedule timer
114 */
115 static void appldata_timer_function(unsigned long data)
116 {
117 queue_work(appldata_wq, (struct work_struct *) data);
118 }
119
120 /*
121 * appldata_work_fn()
122 *
123 * call data gathering function for each (active) module
124 */
125 static void appldata_work_fn(struct work_struct *work)
126 {
127 struct list_head *lh;
128 struct appldata_ops *ops;
129
130 mutex_lock(&appldata_ops_mutex);
131 list_for_each(lh, &appldata_ops_list) {
132 ops = list_entry(lh, struct appldata_ops, list);
133 if (ops->active == 1) {
134 ops->callback(ops->data);
135 }
136 }
137 mutex_unlock(&appldata_ops_mutex);
138 }
139
140 /*
141 * appldata_diag()
142 *
143 * prepare parameter list, issue DIAG 0xDC
144 */
145 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
146 u16 length, char *mod_lvl)
147 {
148 struct appldata_product_id id = {
149 .prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
150 0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
151 .prod_fn = 0xD5D3, /* "NL" */
152 .version_nr = 0xF2F6, /* "26" */
153 .release_nr = 0xF0F1, /* "01" */
154 };
155
156 id.record_nr = record_nr;
157 id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
158 return appldata_asm(&id, function, (void *) buffer, length);
159 }
160 /************************ timer, work, DIAG <END> ****************************/
161
162
163 /****************************** /proc stuff **********************************/
164
165 #define APPLDATA_ADD_TIMER 0
166 #define APPLDATA_DEL_TIMER 1
167 #define APPLDATA_MOD_TIMER 2
168
169 /*
170 * __appldata_vtimer_setup()
171 *
172 * Add, delete or modify virtual timers on all online cpus.
173 * The caller needs to get the appldata_timer_lock spinlock.
174 */
175 static void __appldata_vtimer_setup(int cmd)
176 {
177 u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO;
178
179 switch (cmd) {
180 case APPLDATA_ADD_TIMER:
181 if (appldata_timer_active)
182 break;
183 appldata_timer.expires = timer_interval;
184 add_virt_timer_periodic(&appldata_timer);
185 appldata_timer_active = 1;
186 break;
187 case APPLDATA_DEL_TIMER:
188 del_virt_timer(&appldata_timer);
189 if (!appldata_timer_active)
190 break;
191 appldata_timer_active = 0;
192 break;
193 case APPLDATA_MOD_TIMER:
194 if (!appldata_timer_active)
195 break;
196 mod_virt_timer_periodic(&appldata_timer, timer_interval);
197 }
198 }
199
200 /*
201 * appldata_timer_handler()
202 *
203 * Start/Stop timer, show status of timer (0 = not active, 1 = active)
204 */
205 static int
206 appldata_timer_handler(struct ctl_table *ctl, int write,
207 void __user *buffer, size_t *lenp, loff_t *ppos)
208 {
209 unsigned int len;
210 char buf[2];
211
212 if (!*lenp || *ppos) {
213 *lenp = 0;
214 return 0;
215 }
216 if (!write) {
217 strncpy(buf, appldata_timer_active ? "1\n" : "0\n",
218 ARRAY_SIZE(buf));
219 len = strnlen(buf, ARRAY_SIZE(buf));
220 if (len > *lenp)
221 len = *lenp;
222 if (copy_to_user(buffer, buf, len))
223 return -EFAULT;
224 goto out;
225 }
226 len = *lenp;
227 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
228 return -EFAULT;
229 spin_lock(&appldata_timer_lock);
230 if (buf[0] == '1')
231 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
232 else if (buf[0] == '0')
233 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
234 spin_unlock(&appldata_timer_lock);
235 out:
236 *lenp = len;
237 *ppos += len;
238 return 0;
239 }
240
241 /*
242 * appldata_interval_handler()
243 *
244 * Set (CPU) timer interval for collection of data (in milliseconds), show
245 * current timer interval.
246 */
247 static int
248 appldata_interval_handler(struct ctl_table *ctl, int write,
249 void __user *buffer, size_t *lenp, loff_t *ppos)
250 {
251 unsigned int len;
252 int interval;
253 char buf[16];
254
255 if (!*lenp || *ppos) {
256 *lenp = 0;
257 return 0;
258 }
259 if (!write) {
260 len = sprintf(buf, "%i\n", appldata_interval);
261 if (len > *lenp)
262 len = *lenp;
263 if (copy_to_user(buffer, buf, len))
264 return -EFAULT;
265 goto out;
266 }
267 len = *lenp;
268 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
269 return -EFAULT;
270 interval = 0;
271 sscanf(buf, "%i", &interval);
272 if (interval <= 0)
273 return -EINVAL;
274
275 spin_lock(&appldata_timer_lock);
276 appldata_interval = interval;
277 __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
278 spin_unlock(&appldata_timer_lock);
279 out:
280 *lenp = len;
281 *ppos += len;
282 return 0;
283 }
284
285 /*
286 * appldata_generic_handler()
287 *
288 * Generic start/stop monitoring and DIAG, show status of
289 * monitoring (0 = not in process, 1 = in process)
290 */
291 static int
292 appldata_generic_handler(struct ctl_table *ctl, int write,
293 void __user *buffer, size_t *lenp, loff_t *ppos)
294 {
295 struct appldata_ops *ops = NULL, *tmp_ops;
296 unsigned int len;
297 int rc, found;
298 char buf[2];
299 struct list_head *lh;
300
301 found = 0;
302 mutex_lock(&appldata_ops_mutex);
303 list_for_each(lh, &appldata_ops_list) {
304 tmp_ops = list_entry(lh, struct appldata_ops, list);
305 if (&tmp_ops->ctl_table[2] == ctl) {
306 found = 1;
307 }
308 }
309 if (!found) {
310 mutex_unlock(&appldata_ops_mutex);
311 return -ENODEV;
312 }
313 ops = ctl->data;
314 if (!try_module_get(ops->owner)) { // protect this function
315 mutex_unlock(&appldata_ops_mutex);
316 return -ENODEV;
317 }
318 mutex_unlock(&appldata_ops_mutex);
319
320 if (!*lenp || *ppos) {
321 *lenp = 0;
322 module_put(ops->owner);
323 return 0;
324 }
325 if (!write) {
326 strncpy(buf, ops->active ? "1\n" : "0\n", ARRAY_SIZE(buf));
327 len = strnlen(buf, ARRAY_SIZE(buf));
328 if (len > *lenp)
329 len = *lenp;
330 if (copy_to_user(buffer, buf, len)) {
331 module_put(ops->owner);
332 return -EFAULT;
333 }
334 goto out;
335 }
336 len = *lenp;
337 if (copy_from_user(buf, buffer,
338 len > sizeof(buf) ? sizeof(buf) : len)) {
339 module_put(ops->owner);
340 return -EFAULT;
341 }
342
343 mutex_lock(&appldata_ops_mutex);
344 if ((buf[0] == '1') && (ops->active == 0)) {
345 // protect work queue callback
346 if (!try_module_get(ops->owner)) {
347 mutex_unlock(&appldata_ops_mutex);
348 module_put(ops->owner);
349 return -ENODEV;
350 }
351 ops->callback(ops->data); // init record
352 rc = appldata_diag(ops->record_nr,
353 APPLDATA_START_INTERVAL_REC,
354 (unsigned long) ops->data, ops->size,
355 ops->mod_lvl);
356 if (rc != 0) {
357 pr_err("Starting the data collection for %s "
358 "failed with rc=%d\n", ops->name, rc);
359 module_put(ops->owner);
360 } else
361 ops->active = 1;
362 } else if ((buf[0] == '0') && (ops->active == 1)) {
363 ops->active = 0;
364 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
365 (unsigned long) ops->data, ops->size,
366 ops->mod_lvl);
367 if (rc != 0)
368 pr_err("Stopping the data collection for %s "
369 "failed with rc=%d\n", ops->name, rc);
370 module_put(ops->owner);
371 }
372 mutex_unlock(&appldata_ops_mutex);
373 out:
374 *lenp = len;
375 *ppos += len;
376 module_put(ops->owner);
377 return 0;
378 }
379
380 /*************************** /proc stuff <END> *******************************/
381
382
383 /************************* module-ops management *****************************/
384 /*
385 * appldata_register_ops()
386 *
387 * update ops list, register /proc/sys entries
388 */
389 int appldata_register_ops(struct appldata_ops *ops)
390 {
391 if (ops->size > APPLDATA_MAX_REC_SIZE)
392 return -EINVAL;
393
394 ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
395 if (!ops->ctl_table)
396 return -ENOMEM;
397
398 mutex_lock(&appldata_ops_mutex);
399 list_add(&ops->list, &appldata_ops_list);
400 mutex_unlock(&appldata_ops_mutex);
401
402 ops->ctl_table[0].procname = appldata_proc_name;
403 ops->ctl_table[0].maxlen = 0;
404 ops->ctl_table[0].mode = S_IRUGO | S_IXUGO;
405 ops->ctl_table[0].child = &ops->ctl_table[2];
406
407 ops->ctl_table[2].procname = ops->name;
408 ops->ctl_table[2].mode = S_IRUGO | S_IWUSR;
409 ops->ctl_table[2].proc_handler = appldata_generic_handler;
410 ops->ctl_table[2].data = ops;
411
412 ops->sysctl_header = register_sysctl_table(ops->ctl_table);
413 if (!ops->sysctl_header)
414 goto out;
415 return 0;
416 out:
417 mutex_lock(&appldata_ops_mutex);
418 list_del(&ops->list);
419 mutex_unlock(&appldata_ops_mutex);
420 kfree(ops->ctl_table);
421 return -ENOMEM;
422 }
423
424 /*
425 * appldata_unregister_ops()
426 *
427 * update ops list, unregister /proc entries, stop DIAG if necessary
428 */
429 void appldata_unregister_ops(struct appldata_ops *ops)
430 {
431 mutex_lock(&appldata_ops_mutex);
432 list_del(&ops->list);
433 mutex_unlock(&appldata_ops_mutex);
434 unregister_sysctl_table(ops->sysctl_header);
435 kfree(ops->ctl_table);
436 }
437 /********************** module-ops management <END> **************************/
438
439
440 /**************************** suspend / resume *******************************/
441 static int appldata_freeze(struct device *dev)
442 {
443 struct appldata_ops *ops;
444 int rc;
445 struct list_head *lh;
446
447 spin_lock(&appldata_timer_lock);
448 if (appldata_timer_active) {
449 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
450 appldata_timer_suspended = 1;
451 }
452 spin_unlock(&appldata_timer_lock);
453
454 mutex_lock(&appldata_ops_mutex);
455 list_for_each(lh, &appldata_ops_list) {
456 ops = list_entry(lh, struct appldata_ops, list);
457 if (ops->active == 1) {
458 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
459 (unsigned long) ops->data, ops->size,
460 ops->mod_lvl);
461 if (rc != 0)
462 pr_err("Stopping the data collection for %s "
463 "failed with rc=%d\n", ops->name, rc);
464 }
465 }
466 mutex_unlock(&appldata_ops_mutex);
467 return 0;
468 }
469
470 static int appldata_restore(struct device *dev)
471 {
472 struct appldata_ops *ops;
473 int rc;
474 struct list_head *lh;
475
476 spin_lock(&appldata_timer_lock);
477 if (appldata_timer_suspended) {
478 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
479 appldata_timer_suspended = 0;
480 }
481 spin_unlock(&appldata_timer_lock);
482
483 mutex_lock(&appldata_ops_mutex);
484 list_for_each(lh, &appldata_ops_list) {
485 ops = list_entry(lh, struct appldata_ops, list);
486 if (ops->active == 1) {
487 ops->callback(ops->data); // init record
488 rc = appldata_diag(ops->record_nr,
489 APPLDATA_START_INTERVAL_REC,
490 (unsigned long) ops->data, ops->size,
491 ops->mod_lvl);
492 if (rc != 0) {
493 pr_err("Starting the data collection for %s "
494 "failed with rc=%d\n", ops->name, rc);
495 }
496 }
497 }
498 mutex_unlock(&appldata_ops_mutex);
499 return 0;
500 }
501
502 static int appldata_thaw(struct device *dev)
503 {
504 return appldata_restore(dev);
505 }
506
507 static const struct dev_pm_ops appldata_pm_ops = {
508 .freeze = appldata_freeze,
509 .thaw = appldata_thaw,
510 .restore = appldata_restore,
511 };
512
513 static struct platform_driver appldata_pdrv = {
514 .driver = {
515 .name = "appldata",
516 .pm = &appldata_pm_ops,
517 },
518 };
519 /************************* suspend / resume <END> ****************************/
520
521
522 /******************************* init / exit *********************************/
523
524 /*
525 * appldata_init()
526 *
527 * init timer, register /proc entries
528 */
529 static int __init appldata_init(void)
530 {
531 int rc;
532
533 init_virt_timer(&appldata_timer);
534 appldata_timer.function = appldata_timer_function;
535 appldata_timer.data = (unsigned long) &appldata_work;
536
537 rc = platform_driver_register(&appldata_pdrv);
538 if (rc)
539 return rc;
540
541 appldata_pdev = platform_device_register_simple("appldata", -1, NULL,
542 0);
543 if (IS_ERR(appldata_pdev)) {
544 rc = PTR_ERR(appldata_pdev);
545 goto out_driver;
546 }
547 appldata_wq = alloc_ordered_workqueue("appldata", 0);
548 if (!appldata_wq) {
549 rc = -ENOMEM;
550 goto out_device;
551 }
552
553 appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
554 return 0;
555
556 out_device:
557 platform_device_unregister(appldata_pdev);
558 out_driver:
559 platform_driver_unregister(&appldata_pdrv);
560 return rc;
561 }
562
563 __initcall(appldata_init);
564
565 /**************************** init / exit <END> ******************************/
566
567 EXPORT_SYMBOL_GPL(appldata_register_ops);
568 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
569 EXPORT_SYMBOL_GPL(appldata_diag);
570
571 #ifdef CONFIG_SWAP
572 EXPORT_SYMBOL_GPL(si_swapinfo);
573 #endif
574 EXPORT_SYMBOL_GPL(nr_threads);
575 EXPORT_SYMBOL_GPL(nr_running);
576 EXPORT_SYMBOL_GPL(nr_iowait);