2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* arch/s390/kernel/vtime.c
|
|
|
|
* Virtual cpu timer based timer functions.
|
|
|
|
*
|
|
|
|
* S390 version
|
|
|
|
* Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
|
|
* Author(s): Jan Glauber <jan.glauber@de.ibm.com>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/time.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/smp.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/timex.h>
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
#include <linux/kernel_stat.h>
|
|
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <linux/posix-timers.h>
|
|
|
|
|
|
|
|
#include <asm/s390_ext.h>
|
|
|
|
#include <asm/timer.h>
|
2006-10-06 16:38:35 +02:00
|
|
|
#include <asm/irq_regs.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
static ext_int_info_t ext_int_info_timer;
|
|
|
|
DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
|
|
|
|
|
|
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
|
|
|
|
/*
|
|
|
|
* Update process times based on virtual cpu times stored by entry.S
|
|
|
|
* to the lowcore fields user_timer, system_timer & steal_clock.
|
|
|
|
*/
|
2006-01-14 22:21:03 +01:00
|
|
|
void account_tick_vtime(struct task_struct *tsk)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
cputime_t cputime;
|
|
|
|
__u64 timer, clock;
|
|
|
|
int rcu_user_flag;
|
|
|
|
|
|
|
|
timer = S390_lowcore.last_update_timer;
|
|
|
|
clock = S390_lowcore.last_update_clock;
|
|
|
|
asm volatile (" STPT %0\n" /* Store current cpu timer value */
|
|
|
|
" STCK %1" /* Store current tod clock value */
|
|
|
|
: "=m" (S390_lowcore.last_update_timer),
|
|
|
|
"=m" (S390_lowcore.last_update_clock) );
|
|
|
|
S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
|
|
|
|
S390_lowcore.steal_clock += S390_lowcore.last_update_clock - clock;
|
|
|
|
|
|
|
|
cputime = S390_lowcore.user_timer >> 12;
|
|
|
|
rcu_user_flag = cputime != 0;
|
|
|
|
S390_lowcore.user_timer -= cputime << 12;
|
|
|
|
S390_lowcore.steal_clock -= cputime << 12;
|
|
|
|
account_user_time(tsk, cputime);
|
|
|
|
|
|
|
|
cputime = S390_lowcore.system_timer >> 12;
|
|
|
|
S390_lowcore.system_timer -= cputime << 12;
|
|
|
|
S390_lowcore.steal_clock -= cputime << 12;
|
|
|
|
account_system_time(tsk, HARDIRQ_OFFSET, cputime);
|
|
|
|
|
|
|
|
cputime = S390_lowcore.steal_clock;
|
|
|
|
if ((__s64) cputime > 0) {
|
|
|
|
cputime >>= 12;
|
|
|
|
S390_lowcore.steal_clock -= cputime << 12;
|
|
|
|
account_steal_time(tsk, cputime);
|
|
|
|
}
|
|
|
|
|
|
|
|
run_local_timers();
|
|
|
|
if (rcu_pending(smp_processor_id()))
|
|
|
|
rcu_check_callbacks(smp_processor_id(), rcu_user_flag);
|
|
|
|
scheduler_tick();
|
|
|
|
run_posix_cpu_timers(tsk);
|
|
|
|
}
|
|
|
|
|
2006-01-14 22:21:03 +01:00
|
|
|
/*
|
|
|
|
* Update process times based on virtual cpu times stored by entry.S
|
|
|
|
* to the lowcore fields user_timer, system_timer & steal_clock.
|
|
|
|
*/
|
|
|
|
void account_vtime(struct task_struct *tsk)
|
|
|
|
{
|
|
|
|
cputime_t cputime;
|
|
|
|
__u64 timer;
|
|
|
|
|
|
|
|
timer = S390_lowcore.last_update_timer;
|
|
|
|
asm volatile (" STPT %0" /* Store current cpu timer value */
|
|
|
|
: "=m" (S390_lowcore.last_update_timer) );
|
|
|
|
S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
|
|
|
|
|
|
|
|
cputime = S390_lowcore.user_timer >> 12;
|
|
|
|
S390_lowcore.user_timer -= cputime << 12;
|
|
|
|
S390_lowcore.steal_clock -= cputime << 12;
|
|
|
|
account_user_time(tsk, cputime);
|
|
|
|
|
|
|
|
cputime = S390_lowcore.system_timer >> 12;
|
|
|
|
S390_lowcore.system_timer -= cputime << 12;
|
|
|
|
S390_lowcore.steal_clock -= cputime << 12;
|
|
|
|
account_system_time(tsk, 0, cputime);
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* Update process times based on virtual cpu times stored by entry.S
|
|
|
|
* to the lowcore fields user_timer, system_timer & steal_clock.
|
|
|
|
*/
|
|
|
|
void account_system_vtime(struct task_struct *tsk)
|
|
|
|
{
|
|
|
|
cputime_t cputime;
|
|
|
|
__u64 timer;
|
|
|
|
|
|
|
|
timer = S390_lowcore.last_update_timer;
|
|
|
|
asm volatile (" STPT %0" /* Store current cpu timer value */
|
|
|
|
: "=m" (S390_lowcore.last_update_timer) );
|
|
|
|
S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
|
|
|
|
|
|
|
|
cputime = S390_lowcore.system_timer >> 12;
|
|
|
|
S390_lowcore.system_timer -= cputime << 12;
|
|
|
|
S390_lowcore.steal_clock -= cputime << 12;
|
|
|
|
account_system_time(tsk, 0, cputime);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void set_vtimer(__u64 expires)
|
|
|
|
{
|
|
|
|
__u64 timer;
|
|
|
|
|
|
|
|
asm volatile (" STPT %0\n" /* Store current cpu timer value */
|
|
|
|
" SPT %1" /* Set new value immediatly afterwards */
|
|
|
|
: "=m" (timer) : "m" (expires) );
|
|
|
|
S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer;
|
|
|
|
S390_lowcore.last_update_timer = expires;
|
|
|
|
|
|
|
|
/* store expire time for this CPU timer */
|
|
|
|
per_cpu(virt_cpu_timer, smp_processor_id()).to_expire = expires;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void set_vtimer(__u64 expires)
|
|
|
|
{
|
|
|
|
S390_lowcore.last_update_timer = expires;
|
|
|
|
asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer));
|
|
|
|
|
|
|
|
/* store expire time for this CPU timer */
|
|
|
|
per_cpu(virt_cpu_timer, smp_processor_id()).to_expire = expires;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static void start_cpu_timer(void)
|
|
|
|
{
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
|
2005-05-01 17:58:57 +02:00
|
|
|
|
|
|
|
/* CPU timer interrupt is pending, don't reprogramm it */
|
|
|
|
if (vt_list->idle & 1LL<<63)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (!list_empty(&vt_list->list))
|
|
|
|
set_vtimer(vt_list->idle);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void stop_cpu_timer(void)
|
|
|
|
{
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
|
|
|
|
|
|
|
|
/* nothing to do */
|
|
|
|
if (list_empty(&vt_list->list)) {
|
|
|
|
vt_list->idle = VTIMER_MAX_SLICE;
|
|
|
|
goto fire;
|
|
|
|
}
|
|
|
|
|
2005-05-01 17:58:57 +02:00
|
|
|
/* store the actual expire value */
|
|
|
|
asm volatile ("STPT %0" : "=m" (vt_list->idle));
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/*
|
2005-05-01 17:58:57 +02:00
|
|
|
* If the CPU timer is negative we don't reprogramm
|
|
|
|
* it because we will get instantly an interrupt.
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
2005-05-01 17:58:57 +02:00
|
|
|
if (vt_list->idle & 1LL<<63)
|
2005-04-17 00:20:36 +02:00
|
|
|
return;
|
|
|
|
|
2005-05-01 17:58:57 +02:00
|
|
|
vt_list->offset += vt_list->to_expire - vt_list->idle;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* We cannot halt the CPU timer, we just write a value that
|
|
|
|
* nearly never expires (only after 71 years) and re-write
|
|
|
|
* the stored expire value if we continue the timer
|
|
|
|
*/
|
|
|
|
fire:
|
|
|
|
set_vtimer(VTIMER_MAX_SLICE);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Sorted add to a list. List is linear searched until first bigger
|
|
|
|
* element is found.
|
|
|
|
*/
|
|
|
|
static void list_add_sorted(struct vtimer_list *timer, struct list_head *head)
|
|
|
|
{
|
|
|
|
struct vtimer_list *event;
|
|
|
|
|
|
|
|
list_for_each_entry(event, head, entry) {
|
|
|
|
if (event->expires > timer->expires) {
|
|
|
|
list_add_tail(&timer->entry, &event->entry);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
list_add_tail(&timer->entry, head);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Do the callback functions of expired vtimer events.
|
|
|
|
* Called from within the interrupt handler.
|
|
|
|
*/
|
2006-10-11 15:31:26 +02:00
|
|
|
static void do_callbacks(struct list_head *cb_list)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
struct vtimer_list *event, *tmp;
|
2006-10-11 15:31:26 +02:00
|
|
|
void (*fn)(unsigned long);
|
2005-04-17 00:20:36 +02:00
|
|
|
unsigned long data;
|
|
|
|
|
|
|
|
if (list_empty(cb_list))
|
|
|
|
return;
|
|
|
|
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
|
|
|
|
|
|
|
|
list_for_each_entry_safe(event, tmp, cb_list, entry) {
|
|
|
|
fn = event->function;
|
|
|
|
data = event->data;
|
2006-10-11 15:31:26 +02:00
|
|
|
fn(data);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
if (!event->interval)
|
|
|
|
/* delete one shot timer */
|
|
|
|
list_del_init(&event->entry);
|
|
|
|
else {
|
|
|
|
/* move interval timer back to list */
|
|
|
|
spin_lock(&vt_list->lock);
|
|
|
|
list_del_init(&event->entry);
|
|
|
|
list_add_sorted(event, &vt_list->list);
|
|
|
|
spin_unlock(&vt_list->lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handler for the virtual CPU timer.
|
|
|
|
*/
|
2006-10-06 16:38:35 +02:00
|
|
|
static void do_cpu_timer_interrupt(__u16 error_code)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
int cpu;
|
|
|
|
__u64 next, delta;
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
struct vtimer_list *event, *tmp;
|
|
|
|
struct list_head *ptr;
|
|
|
|
/* the callback queue */
|
|
|
|
struct list_head cb_list;
|
|
|
|
|
|
|
|
INIT_LIST_HEAD(&cb_list);
|
|
|
|
cpu = smp_processor_id();
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, cpu);
|
|
|
|
|
|
|
|
/* walk timer list, fire all expired events */
|
|
|
|
spin_lock(&vt_list->lock);
|
|
|
|
|
|
|
|
if (vt_list->to_expire < VTIMER_MAX_SLICE)
|
|
|
|
vt_list->offset += vt_list->to_expire;
|
|
|
|
|
|
|
|
list_for_each_entry_safe(event, tmp, &vt_list->list, entry) {
|
|
|
|
if (event->expires > vt_list->offset)
|
|
|
|
/* found first unexpired event, leave */
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* re-charge interval timer, we have to add the offset */
|
|
|
|
if (event->interval)
|
|
|
|
event->expires = event->interval + vt_list->offset;
|
|
|
|
|
|
|
|
/* move expired timer to the callback queue */
|
|
|
|
list_move_tail(&event->entry, &cb_list);
|
|
|
|
}
|
|
|
|
spin_unlock(&vt_list->lock);
|
2006-10-11 15:31:26 +02:00
|
|
|
do_callbacks(&cb_list);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/* next event is first in list */
|
|
|
|
spin_lock(&vt_list->lock);
|
|
|
|
if (!list_empty(&vt_list->list)) {
|
|
|
|
ptr = vt_list->list.next;
|
|
|
|
event = list_entry(ptr, struct vtimer_list, entry);
|
|
|
|
next = event->expires - vt_list->offset;
|
|
|
|
|
|
|
|
/* add the expired time from this interrupt handler
|
|
|
|
* and the callback functions
|
|
|
|
*/
|
|
|
|
asm volatile ("STPT %0" : "=m" (delta));
|
|
|
|
delta = 0xffffffffffffffffLL - delta + 1;
|
|
|
|
vt_list->offset += delta;
|
|
|
|
next -= delta;
|
|
|
|
} else {
|
|
|
|
vt_list->offset = 0;
|
|
|
|
next = VTIMER_MAX_SLICE;
|
|
|
|
}
|
|
|
|
spin_unlock(&vt_list->lock);
|
|
|
|
set_vtimer(next);
|
|
|
|
}
|
|
|
|
|
|
|
|
void init_virt_timer(struct vtimer_list *timer)
|
|
|
|
{
|
|
|
|
timer->function = NULL;
|
|
|
|
INIT_LIST_HEAD(&timer->entry);
|
|
|
|
spin_lock_init(&timer->lock);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(init_virt_timer);
|
|
|
|
|
|
|
|
static inline int vtimer_pending(struct vtimer_list *timer)
|
|
|
|
{
|
|
|
|
return (!list_empty(&timer->entry));
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this function should only run on the specified CPU
|
|
|
|
*/
|
|
|
|
static void internal_add_vtimer(struct vtimer_list *timer)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
__u64 done;
|
|
|
|
struct vtimer_list *event;
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, timer->cpu);
|
|
|
|
spin_lock_irqsave(&vt_list->lock, flags);
|
|
|
|
|
|
|
|
if (timer->cpu != smp_processor_id())
|
|
|
|
printk("internal_add_vtimer: BUG, running on wrong CPU");
|
|
|
|
|
|
|
|
/* if list is empty we only have to set the timer */
|
|
|
|
if (list_empty(&vt_list->list)) {
|
|
|
|
/* reset the offset, this may happen if the last timer was
|
|
|
|
* just deleted by mod_virt_timer and the interrupt
|
|
|
|
* didn't happen until here
|
|
|
|
*/
|
|
|
|
vt_list->offset = 0;
|
|
|
|
goto fire;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* save progress */
|
|
|
|
asm volatile ("STPT %0" : "=m" (done));
|
|
|
|
|
|
|
|
/* calculate completed work */
|
|
|
|
done = vt_list->to_expire - done + vt_list->offset;
|
|
|
|
vt_list->offset = 0;
|
|
|
|
|
|
|
|
list_for_each_entry(event, &vt_list->list, entry)
|
|
|
|
event->expires -= done;
|
|
|
|
|
|
|
|
fire:
|
|
|
|
list_add_sorted(timer, &vt_list->list);
|
|
|
|
|
|
|
|
/* get first element, which is the next vtimer slice */
|
|
|
|
event = list_entry(vt_list->list.next, struct vtimer_list, entry);
|
|
|
|
|
|
|
|
set_vtimer(event->expires);
|
|
|
|
spin_unlock_irqrestore(&vt_list->lock, flags);
|
2006-06-26 18:35:02 +02:00
|
|
|
/* release CPU acquired in prepare_vtimer or mod_virt_timer() */
|
2005-04-17 00:20:36 +02:00
|
|
|
put_cpu();
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int prepare_vtimer(struct vtimer_list *timer)
|
|
|
|
{
|
2005-10-31 00:02:03 +01:00
|
|
|
if (!timer->function) {
|
2005-04-17 00:20:36 +02:00
|
|
|
printk("add_virt_timer: uninitialized timer\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!timer->expires || timer->expires > VTIMER_MAX_SLICE) {
|
|
|
|
printk("add_virt_timer: invalid timer expire value!\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (vtimer_pending(timer)) {
|
|
|
|
printk("add_virt_timer: timer pending\n");
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
timer->cpu = get_cpu();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* add_virt_timer - add an oneshot virtual CPU timer
|
|
|
|
*/
|
|
|
|
void add_virt_timer(void *new)
|
|
|
|
{
|
|
|
|
struct vtimer_list *timer;
|
|
|
|
|
|
|
|
timer = (struct vtimer_list *)new;
|
|
|
|
|
|
|
|
if (prepare_vtimer(timer) < 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
timer->interval = 0;
|
|
|
|
internal_add_vtimer(timer);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(add_virt_timer);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* add_virt_timer_int - add an interval virtual CPU timer
|
|
|
|
*/
|
|
|
|
void add_virt_timer_periodic(void *new)
|
|
|
|
{
|
|
|
|
struct vtimer_list *timer;
|
|
|
|
|
|
|
|
timer = (struct vtimer_list *)new;
|
|
|
|
|
|
|
|
if (prepare_vtimer(timer) < 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
timer->interval = timer->expires;
|
|
|
|
internal_add_vtimer(timer);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(add_virt_timer_periodic);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If we change a pending timer the function must be called on the CPU
|
|
|
|
* where the timer is running on, e.g. by smp_call_function_on()
|
|
|
|
*
|
|
|
|
* The original mod_timer adds the timer if it is not pending. For compatibility
|
|
|
|
* we do the same. The timer will be added on the current CPU as a oneshot timer.
|
|
|
|
*
|
|
|
|
* returns whether it has modified a pending timer (1) or not (0)
|
|
|
|
*/
|
|
|
|
int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
|
|
|
|
{
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
unsigned long flags;
|
|
|
|
int cpu;
|
|
|
|
|
2005-10-31 00:02:03 +01:00
|
|
|
if (!timer->function) {
|
2005-04-17 00:20:36 +02:00
|
|
|
printk("mod_virt_timer: uninitialized timer\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!expires || expires > VTIMER_MAX_SLICE) {
|
|
|
|
printk("mod_virt_timer: invalid expire range\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This is a common optimization triggered by the
|
|
|
|
* networking code - if the timer is re-modified
|
|
|
|
* to be the same thing then just return:
|
|
|
|
*/
|
|
|
|
if (timer->expires == expires && vtimer_pending(timer))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
cpu = get_cpu();
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, cpu);
|
|
|
|
|
|
|
|
/* disable interrupts before test if timer is pending */
|
|
|
|
spin_lock_irqsave(&vt_list->lock, flags);
|
|
|
|
|
|
|
|
/* if timer isn't pending add it on the current CPU */
|
|
|
|
if (!vtimer_pending(timer)) {
|
|
|
|
spin_unlock_irqrestore(&vt_list->lock, flags);
|
|
|
|
/* we do not activate an interval timer with mod_virt_timer */
|
|
|
|
timer->interval = 0;
|
|
|
|
timer->expires = expires;
|
|
|
|
timer->cpu = cpu;
|
|
|
|
internal_add_vtimer(timer);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* check if we run on the right CPU */
|
|
|
|
if (timer->cpu != cpu) {
|
|
|
|
printk("mod_virt_timer: running on wrong CPU, check your code\n");
|
|
|
|
spin_unlock_irqrestore(&vt_list->lock, flags);
|
|
|
|
put_cpu();
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
list_del_init(&timer->entry);
|
|
|
|
timer->expires = expires;
|
|
|
|
|
|
|
|
/* also change the interval if we have an interval timer */
|
|
|
|
if (timer->interval)
|
|
|
|
timer->interval = expires;
|
|
|
|
|
|
|
|
/* the timer can't expire anymore so we can release the lock */
|
|
|
|
spin_unlock_irqrestore(&vt_list->lock, flags);
|
|
|
|
internal_add_vtimer(timer);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(mod_virt_timer);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* delete a virtual timer
|
|
|
|
*
|
|
|
|
* returns whether the deleted timer was pending (1) or not (0)
|
|
|
|
*/
|
|
|
|
int del_virt_timer(struct vtimer_list *timer)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
|
|
|
|
/* check if timer is pending */
|
|
|
|
if (!vtimer_pending(timer))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, timer->cpu);
|
|
|
|
spin_lock_irqsave(&vt_list->lock, flags);
|
|
|
|
|
|
|
|
/* we don't interrupt a running timer, just let it expire! */
|
|
|
|
list_del_init(&timer->entry);
|
|
|
|
|
|
|
|
/* last timer removed */
|
|
|
|
if (list_empty(&vt_list->list)) {
|
|
|
|
vt_list->to_expire = 0;
|
|
|
|
vt_list->offset = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&vt_list->lock, flags);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(del_virt_timer);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Start the virtual CPU timer on the current CPU.
|
|
|
|
*/
|
|
|
|
void init_cpu_vtimer(void)
|
|
|
|
{
|
|
|
|
struct vtimer_queue *vt_list;
|
|
|
|
unsigned long cr0;
|
|
|
|
|
|
|
|
/* kick the virtual timer */
|
|
|
|
S390_lowcore.exit_timer = VTIMER_MAX_SLICE;
|
|
|
|
S390_lowcore.last_update_timer = VTIMER_MAX_SLICE;
|
|
|
|
asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer));
|
|
|
|
asm volatile ("STCK %0" : "=m" (S390_lowcore.last_update_clock));
|
|
|
|
__ctl_store(cr0, 0, 0);
|
|
|
|
cr0 |= 0x400;
|
|
|
|
__ctl_load(cr0, 0, 0);
|
|
|
|
|
|
|
|
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
|
|
|
|
INIT_LIST_HEAD(&vt_list->list);
|
|
|
|
spin_lock_init(&vt_list->lock);
|
|
|
|
vt_list->to_expire = 0;
|
|
|
|
vt_list->offset = 0;
|
|
|
|
vt_list->idle = 0;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vtimer_idle_notify(struct notifier_block *self,
|
|
|
|
unsigned long action, void *hcpu)
|
|
|
|
{
|
|
|
|
switch (action) {
|
|
|
|
case CPU_IDLE:
|
|
|
|
stop_cpu_timer();
|
|
|
|
break;
|
|
|
|
case CPU_NOT_IDLE:
|
|
|
|
start_cpu_timer();
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block vtimer_idle_nb = {
|
|
|
|
.notifier_call = vtimer_idle_notify,
|
|
|
|
};
|
|
|
|
|
|
|
|
void __init vtime_init(void)
|
|
|
|
{
|
|
|
|
/* request the cpu timer external interrupt */
|
|
|
|
if (register_early_external_interrupt(0x1005, do_cpu_timer_interrupt,
|
|
|
|
&ext_int_info_timer) != 0)
|
|
|
|
panic("Couldn't request external interrupt 0x1005");
|
|
|
|
|
|
|
|
if (register_idle_notifier(&vtimer_idle_nb))
|
|
|
|
panic("Couldn't register idle notifier");
|
|
|
|
|
|
|
|
init_cpu_vtimer();
|
|
|
|
}
|
|
|
|
|