/*
* arch/s390/appldata/appldata_base.c
*
* Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
* Exports appldata_register_ops() and appldata_unregister_ops() for the
* data gathering modules.
*
* Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
*
* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/page-flags.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 <asm/appldata.h>
#include <asm/timer.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/smp.h>
#include "appldata.h"
#define MY_PRINT_NAME "appldata" /* for debug messages, etc. */
#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(ctl_table *ctl, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
static int appldata_interval_handler(ctl_table *ctl, int write,
struct file *filp,
void __user *buffer,
size_t *lenp, loff_t *ppos);
static struct ctl_table_header *appldata_sysctl_header;
static struct ctl_table appldata_table[] = {
{
.ctl_name = CTL_APPLDATA_TIMER,
.procname = "timer",
.mode = S_IRUGO | S_IWUSR,
.proc_handler = &appldata_timer_handler,
},
{
.ctl_name = CTL_APPLDATA_INTERVAL,
.procname = "interval",
.mode = S_IRUGO | S_IWUSR,
.proc_handler = &appldata_interval_handler,
},
{ .ctl_name = 0 }
};
static struct ctl_table appldata_dir_table[] = {
{
.ctl_name = CTL_APPLDATA,
.procname = appldata_proc_name,
.maxlen = 0,
.mode = S_IRUGO | S_IXUGO,
.child = appldata_table,
},
{ .ctl_name = 0 }
};
/*
* Timer
*/
DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
static atomic_t appldata_expire_count = ATOMIC_INIT(0);
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(void *data);
static DECLARE_WORK(appldata_work, appldata_work_fn, NULL);
/*
* Ops list
*/
static DEFINE_SPINLOCK(appldata_ops_lock);
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, struct pt_regs *regs)
{
P_DEBUG(" -= Timer =-\n");
P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
atomic_read(&appldata_expire_count));
if (atomic_dec_and_test(&appldata_expire_count)) {
atomic_set(&appldata_expire_count, num_online_cpus());
queue_work(appldata_wq, (struct work_struct *) data);
}
}
/*
* appldata_work_fn()
*
* call data gathering function for each (active) module
*/
static void appldata_work_fn(void *data)
{
struct list_head *lh;
struct appldata_ops *ops;
int i;
P_DEBUG(" -= Work Queue =-\n");
i = 0;
spin_lock(&appldata_ops_lock);
list_for_each(lh, &appldata_ops_list) {
ops = list_entry(lh, struct appldata_ops, list);
P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
++i, ops->active, ops->name);
if (ops->active == 1) {
ops->callback(ops->data);
}
}
spin_unlock(&appldata_ops_lock);
}
/*
* 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_product_id id = {
.prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
.prod_fn = 0xD5D3, /* "NL" */
.record_nr = record_nr,
.version_nr = 0xF2F6, /* "26" */
.release_nr = 0xF0F1, /* "01" */
.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1],
};
return appldata_asm(&id, function, (void *) buffer, length);
}
/************************ timer, work, DIAG <END> ****************************/
/****************************** /proc stuff **********************************/
/*
* appldata_mod_vtimer_wrap()
*
* wrapper function for mod_virt_timer(), because smp_call_function_on()
* accepts only one parameter.
*/
static void __appldata_mod_vtimer_wrap(void *p) {
struct {
struct vtimer_list *timer;
u64 expires;
} *args = p;
mod_virt_timer(args->timer, args->expires);
}
#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 per_cpu_interval;
int i;
switch (cmd) {
case APPLDATA_ADD_TIMER:
if (appldata_timer_active)
break;
per_cpu_interval = (u64) (appldata_interval*1000 /
num_online_cpus()) * TOD_MICRO;
for_each_online_cpu(i) {
per_cpu(appldata_timer, i).expires = per_cpu_interval;
smp_call_function_on(add_virt_timer_periodic,
&per_cpu(appldata_timer, i),
0, 1, i);
}
appldata_timer_active = 1;
P_INFO("Monitoring timer started.\n");
break;
case APPLDATA_DEL_TIMER:
for_each_online_cpu(i)
del_virt_timer(&per_cpu(appldata_timer, i));
if (!appldata_timer_active)
break;
appldata_timer_active = 0;
atomic_set(&appldata_expire_count, num_online_cpus());
P_INFO("Monitoring timer stopped.\n");
break;
case APPLDATA_MOD_TIMER:
per_cpu_interval = (u64) (appldata_interval*1000 /
num_online_cpus()) * TOD_MICRO;
if (!appldata_timer_active)
break;
for_each_online_cpu(i) {
struct {
struct vtimer_list *timer;
u64 expires;
} args;
args.timer = &per_cpu(appldata_timer, i);
args.expires = per_cpu_interval;
smp_call_function_on(__appldata_mod_vtimer_wrap,
&args, 0, 1, i);
}
}
}
/*
* appldata_timer_handler()
*
* Start/Stop timer, show status of timer (0 = not active, 1 = active)
*/
static int
appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int len;
char buf[2];
if (!*lenp || *ppos) {
*lenp = 0;
return 0;
}
if (!write) {
len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
if (len > *lenp)
len = *lenp;
if (copy_to_user(buffer, buf, len))
return -EFAULT;
goto out;
}
len = *lenp;
if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
return -EFAULT;
spin_lock(&appldata_timer_lock);
if (buf[0] == '1')
__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
else if (buf[0] == '0')
__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
spin_unlock(&appldata_timer_lock);
out:
*lenp = len;
*ppos += len;
return 0;
}
/*
* appldata_interval_handler()
*
* Set (CPU) timer interval for collection of data (in milliseconds), show
* current timer interval.
*/
static int
appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int len, interval;
char buf[16];
if (!*lenp || *ppos) {
*lenp = 0;
return 0;
}
if (!write) {
len = sprintf(buf, "%i\n", appldata_interval);
if (len > *lenp)
len = *lenp;
if (copy_to_user(buffer, buf, len))
return -EFAULT;
goto out;
}
len = *lenp;
if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
return -EFAULT;
}
sscanf(buf, "%i", &interval);
if (interval <= 0) {
P_ERROR("Timer CPU interval has to be > 0!\n");
return -EINVAL;
}
spin_lock(&appldata_timer_lock);
appldata_interval = interval;
__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
spin_unlock(&appldata_timer_lock);
P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
interval);
out:
*lenp = len;
*ppos += len;
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(ctl_table *ctl, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
struct appldata_ops *ops = NULL, *tmp_ops;
int rc, len, found;
char buf[2];
struct list_head *lh;
found = 0;
spin_lock(&appldata_ops_lock);
list_for_each(lh, &appldata_ops_list) {
tmp_ops = list_entry(lh, struct appldata_ops, list);
if (&tmp_ops->ctl_table[2] == ctl) {
found = 1;
}
}
if (!found) {
spin_unlock(&appldata_ops_lock);
return -ENODEV;
}
ops = ctl->data;
if (!try_module_get(ops->owner)) { // protect this function
spin_unlock(&appldata_ops_lock);
return -ENODEV;
}
spin_unlock(&appldata_ops_lock);
if (!*lenp || *ppos) {
*lenp = 0;
module_put(ops->owner);
return 0;
}
if (!write) {
len = sprintf(buf, ops->active ? "1\n" : "0\n");
if (len > *lenp)
len = *lenp;
if (copy_to_user(buffer, buf, len)) {
module_put(ops->owner);
return -EFAULT;
}
goto out;
}
len = *lenp;
if (copy_from_user(buf, buffer,
len > sizeof(buf) ? sizeof(buf) : len)) {
module_put(ops->owner);
return -EFAULT;
}
spin_lock(&appldata_ops_lock);
if ((buf[0] == '1') && (ops->active == 0)) {
// protect work queue callback
if (!try_module_get(ops->owner)) {
spin_unlock(&appldata_ops_lock);
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) {
P_ERROR("START DIAG 0xDC for %s failed, "
"return code: %d\n", ops->name, rc);
module_put(ops->owner);
} else {
P_INFO("Monitoring %s data enabled, "
"DIAG 0xDC started.\n", ops->name);
ops->active = 1;
}
} else if ((buf[0] == '0') && (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) {
P_ERROR("STOP DIAG 0xDC for %s failed, "
"return code: %d\n", ops->name, rc);
} else {
P_INFO("Monitoring %s data disabled, "
"DIAG 0xDC stopped.\n", ops->name);
}
module_put(ops->owner);
}
spin_unlock(&appldata_ops_lock);
out:
*lenp = len;
*ppos += len;
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)
{
struct list_head *lh;
struct appldata_ops *tmp_ops;
int i;
i = 0;
if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
(ops->size < 0)){
P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
return -ENOMEM;
}
if ((ops->ctl_nr == CTL_APPLDATA) ||
(ops->ctl_nr == CTL_APPLDATA_TIMER) ||
(ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
return -EBUSY;
}
ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
if (ops->ctl_table == NULL) {
P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
return -ENOMEM;
}
spin_lock(&appldata_ops_lock);
list_for_each(lh, &appldata_ops_list) {
tmp_ops = list_entry(lh, struct appldata_ops, list);
P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
++i, tmp_ops->name, tmp_ops->ctl_nr);
P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
tmp_ops->name, tmp_ops->ctl_nr, ops->name,
ops->ctl_nr);
if (strncmp(tmp_ops->name, ops->name,
APPLDATA_PROC_NAME_LENGTH) == 0) {
P_ERROR("Name \"%s\" already registered!\n", ops->name);
kfree(ops->ctl_table);
spin_unlock(&appldata_ops_lock);
return -EBUSY;
}
if (tmp_ops->ctl_nr == ops->ctl_nr) {
P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
kfree(ops->ctl_table);
spin_unlock(&appldata_ops_lock);
return -EBUSY;
}
}
list_add(&ops->list, &appldata_ops_list);
spin_unlock(&appldata_ops_lock);
ops->ctl_table[0].ctl_name = CTL_APPLDATA;
ops->ctl_table[0].procname = appldata_proc_name;
ops->ctl_table[0].maxlen = 0;
ops->ctl_table[0].mode = S_IRUGO | S_IXUGO;
ops->ctl_table[0].child = &ops->ctl_table[2];
ops->ctl_table[1].ctl_name = 0;
ops->ctl_table[2].ctl_name = ops->ctl_nr;
ops->ctl_table[2].procname = ops->name;
ops->ctl_table[2].mode = S_IRUGO | S_IWUSR;
ops->ctl_table[2].proc_handler = appldata_generic_handler;
ops->ctl_table[2].data = ops;
ops->ctl_table[3].ctl_name = 0;
ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
P_INFO("%s-ops registered!\n", ops->name);
return 0;
}
/*
* appldata_unregister_ops()
*
* update ops list, unregister /proc entries, stop DIAG if necessary
*/
void appldata_unregister_ops(struct appldata_ops *ops)
{
void *table;
spin_lock(&appldata_ops_lock);
list_del(&ops->list);
/* at that point any incoming access will fail */
table = ops->ctl_table;
ops->ctl_table = NULL;
spin_unlock(&appldata_ops_lock);
unregister_sysctl_table(ops->sysctl_header);
kfree(table);
P_INFO("%s-ops unregistered!\n", ops->name);
}
/********************** module-ops management <END> **************************/
/******************************* init / exit *********************************/
static void
appldata_online_cpu(int cpu)
{
init_virt_timer(&per_cpu(appldata_timer, cpu));
per_cpu(appldata_timer, cpu).function = appldata_timer_function;
per_cpu(appldata_timer, cpu).data = (unsigned long)
&appldata_work;
atomic_inc(&appldata_expire_count);
spin_lock(&appldata_timer_lock);
__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
spin_unlock(&appldata_timer_lock);
}
static void
appldata_offline_cpu(int cpu)
{
del_virt_timer(&per_cpu(appldata_timer, cpu));
if (atomic_dec_and_test(&appldata_expire_count)) {
atomic_set(&appldata_expire_count, num_online_cpus());
queue_work(appldata_wq, &appldata_work);
}
spin_lock(&appldata_timer_lock);
__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
spin_unlock(&appldata_timer_lock);
}
#ifdef CONFIG_HOTPLUG_CPU
static int __cpuinit
appldata_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
switch (action) {
case CPU_ONLINE:
appldata_online_cpu((long) hcpu);
break;
case CPU_DEAD:
appldata_offline_cpu((long) hcpu);
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block appldata_nb = {
.notifier_call = appldata_cpu_notify,
};
#endif
/*
* appldata_init()
*
* init timer, register /proc entries
*/
static int __init appldata_init(void)
{
int i;
P_DEBUG("sizeof(parameter_list) = %lu\n",
sizeof(struct appldata_parameter_list));
appldata_wq = create_singlethread_workqueue("appldata");
if (!appldata_wq) {
P_ERROR("Could not create work queue\n");
return -ENOMEM;
}
for_each_online_cpu(i)
appldata_online_cpu(i);
/* Register cpu hotplug notifier */
register_hotcpu_notifier(&appldata_nb);
appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
#ifdef MODULE
appldata_dir_table[0].de->owner = THIS_MODULE;
appldata_table[0].de->owner = THIS_MODULE;
appldata_table[1].de->owner = THIS_MODULE;
#endif
P_DEBUG("Base interface initialized.\n");
return 0;
}
/*
* appldata_exit()
*
* stop timer, unregister /proc entries
*/
static void __exit appldata_exit(void)
{
struct list_head *lh;
struct appldata_ops *ops;
int rc, i;
P_DEBUG("Unloading module ...\n");
/*
* ops list should be empty, but just in case something went wrong...
*/
spin_lock(&appldata_ops_lock);
list_for_each(lh, &appldata_ops_list) {
ops = list_entry(lh, struct appldata_ops, list);
rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
(unsigned long) ops->data, ops->size,
ops->mod_lvl);
if (rc != 0) {
P_ERROR("STOP DIAG 0xDC for %s failed, "
"return code: %d\n", ops->name, rc);
}
}
spin_unlock(&appldata_ops_lock);
for_each_online_cpu(i)
appldata_offline_cpu(i);
appldata_timer_active = 0;
unregister_sysctl_table(appldata_sysctl_header);
destroy_workqueue(appldata_wq);
P_DEBUG("... module unloaded!\n");
}
/**************************** init / exit <END> ******************************/
module_init(appldata_init);
module_exit(appldata_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
EXPORT_SYMBOL_GPL(appldata_register_ops);
EXPORT_SYMBOL_GPL(appldata_unregister_ops);
EXPORT_SYMBOL_GPL(appldata_diag);
#ifdef MODULE
/*
* Kernel symbols needed by appldata_mem and appldata_os modules.
* However, if this file is compiled as a module (for testing only), these
* symbols are not exported. In this case, we define them locally and export
* those.
*/
void si_swapinfo(struct sysinfo *val)
{
val->freeswap = -1ul;
val->totalswap = -1ul;
}
unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
-1 - FIXED_1/200};
int nr_threads = -1;
void get_full_page_state(struct page_state *ps)
{
memset(ps, -1, sizeof(struct page_state));
}
unsigned long nr_running(void)
{
return -1;
}
unsigned long nr_iowait(void)
{
return -1;
}
/*unsigned long nr_context_switches(void)
{
return -1;
}*/
#endif /* MODULE */
EXPORT_SYMBOL_GPL(si_swapinfo);
EXPORT_SYMBOL_GPL(nr_threads);
EXPORT_SYMBOL_GPL(nr_running);
EXPORT_SYMBOL_GPL(nr_iowait);
//EXPORT_SYMBOL_GPL(nr_context_switches);
