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>
19 #include <linux/page-flags.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);