2 * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
3 * Exports appldata_register_ops() and appldata_unregister_ops() for the
4 * data gathering modules.
6 * Copyright IBM Corp. 2003, 2009
8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
11 #define KMSG_COMPONENT "appldata"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/errno.h>
18 #include <linux/interrupt.h>
19 #include <linux/proc_fs.h>
21 #include <linux/swap.h>
22 #include <linux/pagemap.h>
23 #include <linux/sysctl.h>
24 #include <linux/notifier.h>
25 #include <linux/cpu.h>
26 #include <linux/workqueue.h>
27 #include <linux/suspend.h>
28 #include <linux/platform_device.h>
29 #include <asm/appldata.h>
30 #include <asm/vtimer.h>
31 #include <asm/uaccess.h>
38 #define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for
42 #define TOD_MICRO 0x01000 /* nr. of TOD clock units
45 static struct platform_device *appldata_pdev;
48 * /proc entries (sysctl)
50 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
51 static int appldata_timer_handler(ctl_table *ctl, int write,
52 void __user *buffer, size_t *lenp, loff_t *ppos);
53 static int appldata_interval_handler(ctl_table *ctl, int write,
55 size_t *lenp, loff_t *ppos);
57 static struct ctl_table_header *appldata_sysctl_header;
58 static struct ctl_table appldata_table[] = {
61 .mode = S_IRUGO | S_IWUSR,
62 .proc_handler = appldata_timer_handler,
65 .procname = "interval",
66 .mode = S_IRUGO | S_IWUSR,
67 .proc_handler = appldata_interval_handler,
72 static struct ctl_table appldata_dir_table[] = {
74 .procname = appldata_proc_name,
76 .mode = S_IRUGO | S_IXUGO,
77 .child = appldata_table,
85 static struct vtimer_list appldata_timer;
87 static DEFINE_SPINLOCK(appldata_timer_lock);
88 static int appldata_interval = APPLDATA_CPU_INTERVAL;
89 static int appldata_timer_active;
90 static int appldata_timer_suspended = 0;
95 static struct workqueue_struct *appldata_wq;
96 static void appldata_work_fn(struct work_struct *work);
97 static DECLARE_WORK(appldata_work, appldata_work_fn);
103 static DEFINE_MUTEX(appldata_ops_mutex);
104 static LIST_HEAD(appldata_ops_list);
107 /*************************** timer, work, DIAG *******************************/
109 * appldata_timer_function()
111 * schedule work and reschedule timer
113 static void appldata_timer_function(unsigned long data)
115 queue_work(appldata_wq, (struct work_struct *) data);
121 * call data gathering function for each (active) module
123 static void appldata_work_fn(struct work_struct *work)
125 struct list_head *lh;
126 struct appldata_ops *ops;
128 mutex_lock(&appldata_ops_mutex);
129 list_for_each(lh, &appldata_ops_list) {
130 ops = list_entry(lh, struct appldata_ops, list);
131 if (ops->active == 1) {
132 ops->callback(ops->data);
135 mutex_unlock(&appldata_ops_mutex);
141 * prepare parameter list, issue DIAG 0xDC
143 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
144 u16 length, char *mod_lvl)
146 struct appldata_product_id id = {
147 .prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
148 0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
149 .prod_fn = 0xD5D3, /* "NL" */
150 .version_nr = 0xF2F6, /* "26" */
151 .release_nr = 0xF0F1, /* "01" */
154 id.record_nr = record_nr;
155 id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
156 return appldata_asm(&id, function, (void *) buffer, length);
158 /************************ timer, work, DIAG <END> ****************************/
161 /****************************** /proc stuff **********************************/
163 #define APPLDATA_ADD_TIMER 0
164 #define APPLDATA_DEL_TIMER 1
165 #define APPLDATA_MOD_TIMER 2
168 * __appldata_vtimer_setup()
170 * Add, delete or modify virtual timers on all online cpus.
171 * The caller needs to get the appldata_timer_lock spinlock.
173 static void __appldata_vtimer_setup(int cmd)
175 u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO;
178 case APPLDATA_ADD_TIMER:
179 if (appldata_timer_active)
181 appldata_timer.expires = timer_interval;
182 add_virt_timer_periodic(&appldata_timer);
183 appldata_timer_active = 1;
185 case APPLDATA_DEL_TIMER:
186 del_virt_timer(&appldata_timer);
187 if (!appldata_timer_active)
189 appldata_timer_active = 0;
191 case APPLDATA_MOD_TIMER:
192 if (!appldata_timer_active)
194 mod_virt_timer_periodic(&appldata_timer, timer_interval);
199 * appldata_timer_handler()
201 * Start/Stop timer, show status of timer (0 = not active, 1 = active)
204 appldata_timer_handler(ctl_table *ctl, int write,
205 void __user *buffer, size_t *lenp, loff_t *ppos)
210 if (!*lenp || *ppos) {
215 strncpy(buf, appldata_timer_active ? "1\n" : "0\n",
217 len = strnlen(buf, ARRAY_SIZE(buf));
220 if (copy_to_user(buffer, buf, len))
225 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
227 spin_lock(&appldata_timer_lock);
229 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
230 else if (buf[0] == '0')
231 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
232 spin_unlock(&appldata_timer_lock);
240 * appldata_interval_handler()
242 * Set (CPU) timer interval for collection of data (in milliseconds), show
243 * current timer interval.
246 appldata_interval_handler(ctl_table *ctl, int write,
247 void __user *buffer, size_t *lenp, loff_t *ppos)
252 if (!*lenp || *ppos) {
257 len = sprintf(buf, "%i\n", appldata_interval);
260 if (copy_to_user(buffer, buf, len))
265 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
268 sscanf(buf, "%i", &interval);
272 spin_lock(&appldata_timer_lock);
273 appldata_interval = interval;
274 __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
275 spin_unlock(&appldata_timer_lock);
283 * appldata_generic_handler()
285 * Generic start/stop monitoring and DIAG, show status of
286 * monitoring (0 = not in process, 1 = in process)
289 appldata_generic_handler(ctl_table *ctl, int write,
290 void __user *buffer, size_t *lenp, loff_t *ppos)
292 struct appldata_ops *ops = NULL, *tmp_ops;
295 struct list_head *lh;
298 mutex_lock(&appldata_ops_mutex);
299 list_for_each(lh, &appldata_ops_list) {
300 tmp_ops = list_entry(lh, struct appldata_ops, list);
301 if (&tmp_ops->ctl_table[2] == ctl) {
306 mutex_unlock(&appldata_ops_mutex);
310 if (!try_module_get(ops->owner)) { // protect this function
311 mutex_unlock(&appldata_ops_mutex);
314 mutex_unlock(&appldata_ops_mutex);
316 if (!*lenp || *ppos) {
318 module_put(ops->owner);
322 strncpy(buf, ops->active ? "1\n" : "0\n", ARRAY_SIZE(buf));
323 len = strnlen(buf, ARRAY_SIZE(buf));
326 if (copy_to_user(buffer, buf, len)) {
327 module_put(ops->owner);
333 if (copy_from_user(buf, buffer,
334 len > sizeof(buf) ? sizeof(buf) : len)) {
335 module_put(ops->owner);
339 mutex_lock(&appldata_ops_mutex);
340 if ((buf[0] == '1') && (ops->active == 0)) {
341 // protect work queue callback
342 if (!try_module_get(ops->owner)) {
343 mutex_unlock(&appldata_ops_mutex);
344 module_put(ops->owner);
347 ops->callback(ops->data); // init record
348 rc = appldata_diag(ops->record_nr,
349 APPLDATA_START_INTERVAL_REC,
350 (unsigned long) ops->data, ops->size,
353 pr_err("Starting the data collection for %s "
354 "failed with rc=%d\n", ops->name, rc);
355 module_put(ops->owner);
358 } else if ((buf[0] == '0') && (ops->active == 1)) {
360 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
361 (unsigned long) ops->data, ops->size,
364 pr_err("Stopping the data collection for %s "
365 "failed with rc=%d\n", ops->name, rc);
366 module_put(ops->owner);
368 mutex_unlock(&appldata_ops_mutex);
372 module_put(ops->owner);
376 /*************************** /proc stuff <END> *******************************/
379 /************************* module-ops management *****************************/
381 * appldata_register_ops()
383 * update ops list, register /proc/sys entries
385 int appldata_register_ops(struct appldata_ops *ops)
387 if (ops->size > APPLDATA_MAX_REC_SIZE)
390 ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
394 mutex_lock(&appldata_ops_mutex);
395 list_add(&ops->list, &appldata_ops_list);
396 mutex_unlock(&appldata_ops_mutex);
398 ops->ctl_table[0].procname = appldata_proc_name;
399 ops->ctl_table[0].maxlen = 0;
400 ops->ctl_table[0].mode = S_IRUGO | S_IXUGO;
401 ops->ctl_table[0].child = &ops->ctl_table[2];
403 ops->ctl_table[2].procname = ops->name;
404 ops->ctl_table[2].mode = S_IRUGO | S_IWUSR;
405 ops->ctl_table[2].proc_handler = appldata_generic_handler;
406 ops->ctl_table[2].data = ops;
408 ops->sysctl_header = register_sysctl_table(ops->ctl_table);
409 if (!ops->sysctl_header)
413 mutex_lock(&appldata_ops_mutex);
414 list_del(&ops->list);
415 mutex_unlock(&appldata_ops_mutex);
416 kfree(ops->ctl_table);
421 * appldata_unregister_ops()
423 * update ops list, unregister /proc entries, stop DIAG if necessary
425 void appldata_unregister_ops(struct appldata_ops *ops)
427 mutex_lock(&appldata_ops_mutex);
428 list_del(&ops->list);
429 mutex_unlock(&appldata_ops_mutex);
430 unregister_sysctl_table(ops->sysctl_header);
431 kfree(ops->ctl_table);
433 /********************** module-ops management <END> **************************/
436 /**************************** suspend / resume *******************************/
437 static int appldata_freeze(struct device *dev)
439 struct appldata_ops *ops;
441 struct list_head *lh;
443 spin_lock(&appldata_timer_lock);
444 if (appldata_timer_active) {
445 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
446 appldata_timer_suspended = 1;
448 spin_unlock(&appldata_timer_lock);
450 mutex_lock(&appldata_ops_mutex);
451 list_for_each(lh, &appldata_ops_list) {
452 ops = list_entry(lh, struct appldata_ops, list);
453 if (ops->active == 1) {
454 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
455 (unsigned long) ops->data, ops->size,
458 pr_err("Stopping the data collection for %s "
459 "failed with rc=%d\n", ops->name, rc);
462 mutex_unlock(&appldata_ops_mutex);
466 static int appldata_restore(struct device *dev)
468 struct appldata_ops *ops;
470 struct list_head *lh;
472 spin_lock(&appldata_timer_lock);
473 if (appldata_timer_suspended) {
474 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
475 appldata_timer_suspended = 0;
477 spin_unlock(&appldata_timer_lock);
479 mutex_lock(&appldata_ops_mutex);
480 list_for_each(lh, &appldata_ops_list) {
481 ops = list_entry(lh, struct appldata_ops, list);
482 if (ops->active == 1) {
483 ops->callback(ops->data); // init record
484 rc = appldata_diag(ops->record_nr,
485 APPLDATA_START_INTERVAL_REC,
486 (unsigned long) ops->data, ops->size,
489 pr_err("Starting the data collection for %s "
490 "failed with rc=%d\n", ops->name, rc);
494 mutex_unlock(&appldata_ops_mutex);
498 static int appldata_thaw(struct device *dev)
500 return appldata_restore(dev);
503 static const struct dev_pm_ops appldata_pm_ops = {
504 .freeze = appldata_freeze,
505 .thaw = appldata_thaw,
506 .restore = appldata_restore,
509 static struct platform_driver appldata_pdrv = {
512 .owner = THIS_MODULE,
513 .pm = &appldata_pm_ops,
516 /************************* suspend / resume <END> ****************************/
519 /******************************* init / exit *********************************/
524 * init timer, register /proc entries
526 static int __init appldata_init(void)
530 appldata_timer.function = appldata_timer_function;
531 appldata_timer.data = (unsigned long) &appldata_work;
533 rc = platform_driver_register(&appldata_pdrv);
537 appldata_pdev = platform_device_register_simple("appldata", -1, NULL,
539 if (IS_ERR(appldata_pdev)) {
540 rc = PTR_ERR(appldata_pdev);
543 appldata_wq = create_singlethread_workqueue("appldata");
549 appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
553 platform_device_unregister(appldata_pdev);
555 platform_driver_unregister(&appldata_pdrv);
559 __initcall(appldata_init);
561 /**************************** init / exit <END> ******************************/
563 EXPORT_SYMBOL_GPL(appldata_register_ops);
564 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
565 EXPORT_SYMBOL_GPL(appldata_diag);
568 EXPORT_SYMBOL_GPL(si_swapinfo);
570 EXPORT_SYMBOL_GPL(nr_threads);
571 EXPORT_SYMBOL_GPL(nr_running);
572 EXPORT_SYMBOL_GPL(nr_iowait);