2 * arch/s390/appldata/appldata_base.c
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.
8 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
10 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/errno.h>
17 #include <linux/interrupt.h>
18 #include <linux/proc_fs.h>
20 #include <linux/swap.h>
21 #include <linux/pagemap.h>
22 #include <linux/sysctl.h>
23 #include <linux/notifier.h>
24 #include <linux/cpu.h>
25 #include <linux/workqueue.h>
26 #include <asm/appldata.h>
27 #include <asm/timer.h>
28 #include <asm/uaccess.h>
35 #define MY_PRINT_NAME "appldata" /* for debug messages, etc. */
36 #define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for
40 #define TOD_MICRO 0x01000 /* nr. of TOD clock units
43 * /proc entries (sysctl)
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,
51 size_t *lenp, loff_t *ppos);
53 static struct ctl_table_header *appldata_sysctl_header;
54 static struct ctl_table appldata_table[] = {
56 .ctl_name = CTL_APPLDATA_TIMER,
58 .mode = S_IRUGO | S_IWUSR,
59 .proc_handler = &appldata_timer_handler,
62 .ctl_name = CTL_APPLDATA_INTERVAL,
63 .procname = "interval",
64 .mode = S_IRUGO | S_IWUSR,
65 .proc_handler = &appldata_interval_handler,
70 static struct ctl_table appldata_dir_table[] = {
72 .ctl_name = CTL_APPLDATA,
73 .procname = appldata_proc_name,
75 .mode = S_IRUGO | S_IXUGO,
76 .child = appldata_table,
84 DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
85 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
87 static DEFINE_SPINLOCK(appldata_timer_lock);
88 static int appldata_interval = APPLDATA_CPU_INTERVAL;
89 static int appldata_timer_active;
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);
102 static DEFINE_SPINLOCK(appldata_ops_lock);
103 static LIST_HEAD(appldata_ops_list);
106 /*************************** timer, work, DIAG *******************************/
108 * appldata_timer_function()
110 * schedule work and reschedule timer
112 static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
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());
119 queue_work(appldata_wq, (struct work_struct *) data);
126 * call data gathering function for each (active) module
128 static void appldata_work_fn(void *data)
130 struct list_head *lh;
131 struct appldata_ops *ops;
134 P_DEBUG(" -= Work Queue =-\n");
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);
145 spin_unlock(&appldata_ops_lock);
151 * prepare parameter list, issue DIAG 0xDC
153 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
154 u16 length, char *mod_lvl)
156 struct appldata_product_id id = {
157 .prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
158 0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
159 .prod_fn = 0xD5D3, /* "NL" */
160 .version_nr = 0xF2F6, /* "26" */
161 .release_nr = 0xF0F1, /* "01" */
164 id.record_nr = record_nr;
165 id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
166 return appldata_asm(&id, function, (void *) buffer, length);
168 /************************ timer, work, DIAG <END> ****************************/
171 /****************************** /proc stuff **********************************/
174 * appldata_mod_vtimer_wrap()
176 * wrapper function for mod_virt_timer(), because smp_call_function_on()
177 * accepts only one parameter.
179 static void __appldata_mod_vtimer_wrap(void *p) {
181 struct vtimer_list *timer;
184 mod_virt_timer(args->timer, args->expires);
187 #define APPLDATA_ADD_TIMER 0
188 #define APPLDATA_DEL_TIMER 1
189 #define APPLDATA_MOD_TIMER 2
192 * __appldata_vtimer_setup()
194 * Add, delete or modify virtual timers on all online cpus.
195 * The caller needs to get the appldata_timer_lock spinlock.
198 __appldata_vtimer_setup(int cmd)
200 u64 per_cpu_interval;
204 case APPLDATA_ADD_TIMER:
205 if (appldata_timer_active)
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),
215 appldata_timer_active = 1;
216 P_INFO("Monitoring timer started.\n");
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)
223 appldata_timer_active = 0;
224 atomic_set(&appldata_expire_count, num_online_cpus());
225 P_INFO("Monitoring timer stopped.\n");
227 case APPLDATA_MOD_TIMER:
228 per_cpu_interval = (u64) (appldata_interval*1000 /
229 num_online_cpus()) * TOD_MICRO;
230 if (!appldata_timer_active)
232 for_each_online_cpu(i) {
234 struct vtimer_list *timer;
237 args.timer = &per_cpu(appldata_timer, i);
238 args.expires = per_cpu_interval;
239 smp_call_function_on(__appldata_mod_vtimer_wrap,
246 * appldata_timer_handler()
248 * Start/Stop timer, show status of timer (0 = not active, 1 = active)
251 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
252 void __user *buffer, size_t *lenp, loff_t *ppos)
257 if (!*lenp || *ppos) {
262 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
265 if (copy_to_user(buffer, buf, len))
270 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
272 spin_lock(&appldata_timer_lock);
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);
285 * appldata_interval_handler()
287 * Set (CPU) timer interval for collection of data (in milliseconds), show
288 * current timer interval.
291 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
292 void __user *buffer, size_t *lenp, loff_t *ppos)
297 if (!*lenp || *ppos) {
302 len = sprintf(buf, "%i\n", appldata_interval);
305 if (copy_to_user(buffer, buf, len))
310 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
313 sscanf(buf, "%i", &interval);
315 P_ERROR("Timer CPU interval has to be > 0!\n");
319 spin_lock(&appldata_timer_lock);
320 appldata_interval = interval;
321 __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
322 spin_unlock(&appldata_timer_lock);
324 P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
333 * appldata_generic_handler()
335 * Generic start/stop monitoring and DIAG, show status of
336 * monitoring (0 = not in process, 1 = in process)
339 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
340 void __user *buffer, size_t *lenp, loff_t *ppos)
342 struct appldata_ops *ops = NULL, *tmp_ops;
345 struct list_head *lh;
348 spin_lock(&appldata_ops_lock);
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) {
356 spin_unlock(&appldata_ops_lock);
360 if (!try_module_get(ops->owner)) { // protect this function
361 spin_unlock(&appldata_ops_lock);
364 spin_unlock(&appldata_ops_lock);
366 if (!*lenp || *ppos) {
368 module_put(ops->owner);
372 len = sprintf(buf, ops->active ? "1\n" : "0\n");
375 if (copy_to_user(buffer, buf, len)) {
376 module_put(ops->owner);
382 if (copy_from_user(buf, buffer,
383 len > sizeof(buf) ? sizeof(buf) : len)) {
384 module_put(ops->owner);
388 spin_lock(&appldata_ops_lock);
389 if ((buf[0] == '1') && (ops->active == 0)) {
390 // protect work queue callback
391 if (!try_module_get(ops->owner)) {
392 spin_unlock(&appldata_ops_lock);
393 module_put(ops->owner);
396 ops->callback(ops->data); // init record
397 rc = appldata_diag(ops->record_nr,
398 APPLDATA_START_INTERVAL_REC,
399 (unsigned long) ops->data, ops->size,
402 P_ERROR("START DIAG 0xDC for %s failed, "
403 "return code: %d\n", ops->name, rc);
404 module_put(ops->owner);
406 P_INFO("Monitoring %s data enabled, "
407 "DIAG 0xDC started.\n", ops->name);
410 } else if ((buf[0] == '0') && (ops->active == 1)) {
412 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
413 (unsigned long) ops->data, ops->size,
416 P_ERROR("STOP DIAG 0xDC for %s failed, "
417 "return code: %d\n", ops->name, rc);
419 P_INFO("Monitoring %s data disabled, "
420 "DIAG 0xDC stopped.\n", ops->name);
422 module_put(ops->owner);
424 spin_unlock(&appldata_ops_lock);
428 module_put(ops->owner);
432 /*************************** /proc stuff <END> *******************************/
435 /************************* module-ops management *****************************/
437 * appldata_register_ops()
439 * update ops list, register /proc/sys entries
441 int appldata_register_ops(struct appldata_ops *ops)
443 struct list_head *lh;
444 struct appldata_ops *tmp_ops;
449 if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
451 P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
452 ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
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);
461 ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
462 if (ops->ctl_table == NULL) {
463 P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
467 spin_lock(&appldata_ops_lock);
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,
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);
479 spin_unlock(&appldata_ops_lock);
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);
485 spin_unlock(&appldata_ops_lock);
489 list_add(&ops->list, &appldata_ops_list);
490 spin_unlock(&appldata_ops_lock);
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];
498 ops->ctl_table[1].ctl_name = 0;
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;
506 ops->ctl_table[3].ctl_name = 0;
508 ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
510 P_INFO("%s-ops registered!\n", ops->name);
515 * appldata_unregister_ops()
517 * update ops list, unregister /proc entries, stop DIAG if necessary
519 void appldata_unregister_ops(struct appldata_ops *ops)
522 spin_lock(&appldata_ops_lock);
523 list_del(&ops->list);
524 /* at that point any incoming access will fail */
525 table = ops->ctl_table;
526 ops->ctl_table = NULL;
527 spin_unlock(&appldata_ops_lock);
528 unregister_sysctl_table(ops->sysctl_header);
530 P_INFO("%s-ops unregistered!\n", ops->name);
532 /********************** module-ops management <END> **************************/
535 /******************************* init / exit *********************************/
538 appldata_online_cpu(int cpu)
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)
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);
551 appldata_offline_cpu(int cpu)
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());
556 queue_work(appldata_wq, &appldata_work);
558 spin_lock(&appldata_timer_lock);
559 __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
560 spin_unlock(&appldata_timer_lock);
563 #ifdef CONFIG_HOTPLUG_CPU
565 appldata_cpu_notify(struct notifier_block *self,
566 unsigned long action, void *hcpu)
570 appldata_online_cpu((long) hcpu);
573 appldata_offline_cpu((long) hcpu);
581 static struct notifier_block appldata_nb = {
582 .notifier_call = appldata_cpu_notify,
589 * init timer, register /proc entries
591 static int __init appldata_init(void)
595 P_DEBUG("sizeof(parameter_list) = %lu\n",
596 sizeof(struct appldata_parameter_list));
598 appldata_wq = create_singlethread_workqueue("appldata");
600 P_ERROR("Could not create work queue\n");
604 for_each_online_cpu(i)
605 appldata_online_cpu(i);
607 /* Register cpu hotplug notifier */
608 register_hotcpu_notifier(&appldata_nb);
610 appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
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;
617 P_DEBUG("Base interface initialized.\n");
624 * stop timer, unregister /proc entries
626 static void __exit appldata_exit(void)
628 struct list_head *lh;
629 struct appldata_ops *ops;
632 P_DEBUG("Unloading module ...\n");
634 * ops list should be empty, but just in case something went wrong...
636 spin_lock(&appldata_ops_lock);
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,
640 (unsigned long) ops->data, ops->size,
643 P_ERROR("STOP DIAG 0xDC for %s failed, "
644 "return code: %d\n", ops->name, rc);
647 spin_unlock(&appldata_ops_lock);
649 for_each_online_cpu(i)
650 appldata_offline_cpu(i);
652 appldata_timer_active = 0;
654 unregister_sysctl_table(appldata_sysctl_header);
656 destroy_workqueue(appldata_wq);
657 P_DEBUG("... module unloaded!\n");
659 /**************************** init / exit <END> ******************************/
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");
668 EXPORT_SYMBOL_GPL(appldata_register_ops);
669 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
670 EXPORT_SYMBOL_GPL(appldata_diag);
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
679 void si_swapinfo(struct sysinfo *val)
681 val->freeswap = -1ul;
682 val->totalswap = -1ul;
685 unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
689 void get_full_page_state(struct page_state *ps)
691 memset(ps, -1, sizeof(struct page_state));
694 unsigned long nr_running(void)
699 unsigned long nr_iowait(void)
704 /*unsigned long nr_context_switches(void)
709 EXPORT_SYMBOL_GPL(si_swapinfo);
710 EXPORT_SYMBOL_GPL(nr_threads);
711 EXPORT_SYMBOL_GPL(nr_running);
712 EXPORT_SYMBOL_GPL(nr_iowait);
713 //EXPORT_SYMBOL_GPL(nr_context_switches);