/* These are all the functions necessary to implement itimers */
#include <linux/mm.h>
-#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/syscalls.h>
#include <linux/time.h>
#include <linux/posix-timers.h>
#include <linux/hrtimer.h>
+#include <trace/events/timer.h>
#include <asm/uaccess.h>
return ktime_to_timeval(rem);
}
+static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
+ struct itimerval *const value)
+{
+ cputime_t cval, cinterval;
+ struct cpu_itimer *it = &tsk->signal->it[clock_id];
+
+ spin_lock_irq(&tsk->sighand->siglock);
+
+ cval = it->expires;
+ cinterval = it->incr;
+ if (!cputime_eq(cval, cputime_zero)) {
+ struct task_cputime cputime;
+ cputime_t t;
+
+ thread_group_cputimer(tsk, &cputime);
+ if (clock_id == CPUCLOCK_PROF)
+ t = cputime_add(cputime.utime, cputime.stime);
+ else
+ /* CPUCLOCK_VIRT */
+ t = cputime.utime;
+
+ if (cputime_le(cval, t))
+ /* about to fire */
+ cval = cputime_one_jiffy;
+ else
+ cval = cputime_sub(cval, t);
+ }
+
+ spin_unlock_irq(&tsk->sighand->siglock);
+
+ cputime_to_timeval(cval, &value->it_value);
+ cputime_to_timeval(cinterval, &value->it_interval);
+}
+
int do_getitimer(int which, struct itimerval *value)
{
struct task_struct *tsk = current;
- cputime_t cinterval, cval;
switch (which) {
case ITIMER_REAL:
+ spin_lock_irq(&tsk->sighand->siglock);
value->it_value = itimer_get_remtime(&tsk->signal->real_timer);
value->it_interval =
ktime_to_timeval(tsk->signal->it_real_incr);
+ spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
- read_lock(&tasklist_lock);
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_virt_expires;
- cinterval = tsk->signal->it_virt_incr;
- if (!cputime_eq(cval, cputime_zero)) {
- struct task_struct *t = tsk;
- cputime_t utime = tsk->signal->utime;
- do {
- utime = cputime_add(utime, t->utime);
- t = next_thread(t);
- } while (t != tsk);
- if (cputime_le(cval, utime)) { /* about to fire */
- cval = jiffies_to_cputime(1);
- } else {
- cval = cputime_sub(cval, utime);
- }
- }
- spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
- cputime_to_timeval(cval, &value->it_value);
- cputime_to_timeval(cinterval, &value->it_interval);
+ get_cpu_itimer(tsk, CPUCLOCK_VIRT, value);
break;
case ITIMER_PROF:
- read_lock(&tasklist_lock);
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_prof_expires;
- cinterval = tsk->signal->it_prof_incr;
- if (!cputime_eq(cval, cputime_zero)) {
- struct task_struct *t = tsk;
- cputime_t ptime = cputime_add(tsk->signal->utime,
- tsk->signal->stime);
- do {
- ptime = cputime_add(ptime,
- cputime_add(t->utime,
- t->stime));
- t = next_thread(t);
- } while (t != tsk);
- if (cputime_le(cval, ptime)) { /* about to fire */
- cval = jiffies_to_cputime(1);
- } else {
- cval = cputime_sub(cval, ptime);
- }
- }
- spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
- cputime_to_timeval(cval, &value->it_value);
- cputime_to_timeval(cinterval, &value->it_interval);
+ get_cpu_itimer(tsk, CPUCLOCK_PROF, value);
break;
default:
return(-EINVAL);
return 0;
}
-asmlinkage long sys_getitimer(int which, struct itimerval __user *value)
+SYSCALL_DEFINE2(getitimer, int, which, struct itimerval __user *, value)
{
int error = -EFAULT;
struct itimerval get_buffer;
/*
* The timer is automagically restarted, when interval != 0
*/
-int it_real_fn(void *data)
+enum hrtimer_restart it_real_fn(struct hrtimer *timer)
{
- struct task_struct *tsk = (struct task_struct *) data;
+ struct signal_struct *sig =
+ container_of(timer, struct signal_struct, real_timer);
- send_group_sig_info(SIGALRM, SEND_SIG_PRIV, tsk);
+ trace_itimer_expire(ITIMER_REAL, sig->leader_pid, 0);
+ kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
- if (tsk->signal->it_real_incr.tv64 != 0) {
- hrtimer_forward(&tsk->signal->real_timer,
- tsk->signal->it_real_incr);
+ return HRTIMER_NORESTART;
+}
+
+static inline u32 cputime_sub_ns(cputime_t ct, s64 real_ns)
+{
+ struct timespec ts;
+ s64 cpu_ns;
+
+ cputime_to_timespec(ct, &ts);
+ cpu_ns = timespec_to_ns(&ts);
+
+ return (cpu_ns <= real_ns) ? 0 : cpu_ns - real_ns;
+}
+
+static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
+ const struct itimerval *const value,
+ struct itimerval *const ovalue)
+{
+ cputime_t cval, nval, cinterval, ninterval;
+ s64 ns_ninterval, ns_nval;
+ u32 error, incr_error;
+ struct cpu_itimer *it = &tsk->signal->it[clock_id];
- return HRTIMER_RESTART;
+ nval = timeval_to_cputime(&value->it_value);
+ ns_nval = timeval_to_ns(&value->it_value);
+ ninterval = timeval_to_cputime(&value->it_interval);
+ ns_ninterval = timeval_to_ns(&value->it_interval);
+
+ error = cputime_sub_ns(nval, ns_nval);
+ incr_error = cputime_sub_ns(ninterval, ns_ninterval);
+
+ spin_lock_irq(&tsk->sighand->siglock);
+
+ cval = it->expires;
+ cinterval = it->incr;
+ if (!cputime_eq(cval, cputime_zero) ||
+ !cputime_eq(nval, cputime_zero)) {
+ if (cputime_gt(nval, cputime_zero))
+ nval = cputime_add(nval, cputime_one_jiffy);
+ set_process_cpu_timer(tsk, clock_id, &nval, &cval);
+ }
+ it->expires = nval;
+ it->incr = ninterval;
+ it->error = error;
+ it->incr_error = incr_error;
+ trace_itimer_state(clock_id == CPUCLOCK_VIRT ?
+ ITIMER_VIRTUAL : ITIMER_PROF, value, nval);
+
+ spin_unlock_irq(&tsk->sighand->siglock);
+
+ if (ovalue) {
+ cputime_to_timeval(cval, &ovalue->it_value);
+ cputime_to_timeval(cinterval, &ovalue->it_interval);
}
- return HRTIMER_NORESTART;
}
+/*
+ * Returns true if the timeval is in canonical form
+ */
+#define timeval_valid(t) \
+ (((t)->tv_sec >= 0) && (((unsigned long) (t)->tv_usec) < USEC_PER_SEC))
+
int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
{
struct task_struct *tsk = current;
struct hrtimer *timer;
ktime_t expires;
- cputime_t cval, cinterval, nval, ninterval;
+
+ /*
+ * Validate the timevals in value.
+ */
+ if (!timeval_valid(&value->it_value) ||
+ !timeval_valid(&value->it_interval))
+ return -EINVAL;
switch (which) {
case ITIMER_REAL:
+again:
+ spin_lock_irq(&tsk->sighand->siglock);
timer = &tsk->signal->real_timer;
- hrtimer_cancel(timer);
if (ovalue) {
ovalue->it_value = itimer_get_remtime(timer);
ovalue->it_interval
= ktime_to_timeval(tsk->signal->it_real_incr);
}
- tsk->signal->it_real_incr =
- timeval_to_ktime(value->it_interval);
+ /* We are sharing ->siglock with it_real_fn() */
+ if (hrtimer_try_to_cancel(timer) < 0) {
+ spin_unlock_irq(&tsk->sighand->siglock);
+ goto again;
+ }
expires = timeval_to_ktime(value->it_value);
- if (expires.tv64 != 0)
- hrtimer_start(timer, expires, HRTIMER_REL);
+ if (expires.tv64 != 0) {
+ tsk->signal->it_real_incr =
+ timeval_to_ktime(value->it_interval);
+ hrtimer_start(timer, expires, HRTIMER_MODE_REL);
+ } else
+ tsk->signal->it_real_incr.tv64 = 0;
+
+ trace_itimer_state(ITIMER_REAL, value, 0);
+ spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
- nval = timeval_to_cputime(&value->it_value);
- ninterval = timeval_to_cputime(&value->it_interval);
- read_lock(&tasklist_lock);
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_virt_expires;
- cinterval = tsk->signal->it_virt_incr;
- if (!cputime_eq(cval, cputime_zero) ||
- !cputime_eq(nval, cputime_zero)) {
- if (cputime_gt(nval, cputime_zero))
- nval = cputime_add(nval,
- jiffies_to_cputime(1));
- set_process_cpu_timer(tsk, CPUCLOCK_VIRT,
- &nval, &cval);
- }
- tsk->signal->it_virt_expires = nval;
- tsk->signal->it_virt_incr = ninterval;
- spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
- if (ovalue) {
- cputime_to_timeval(cval, &ovalue->it_value);
- cputime_to_timeval(cinterval, &ovalue->it_interval);
- }
+ set_cpu_itimer(tsk, CPUCLOCK_VIRT, value, ovalue);
break;
case ITIMER_PROF:
- nval = timeval_to_cputime(&value->it_value);
- ninterval = timeval_to_cputime(&value->it_interval);
- read_lock(&tasklist_lock);
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_prof_expires;
- cinterval = tsk->signal->it_prof_incr;
- if (!cputime_eq(cval, cputime_zero) ||
- !cputime_eq(nval, cputime_zero)) {
- if (cputime_gt(nval, cputime_zero))
- nval = cputime_add(nval,
- jiffies_to_cputime(1));
- set_process_cpu_timer(tsk, CPUCLOCK_PROF,
- &nval, &cval);
- }
- tsk->signal->it_prof_expires = nval;
- tsk->signal->it_prof_incr = ninterval;
- spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
- if (ovalue) {
- cputime_to_timeval(cval, &ovalue->it_value);
- cputime_to_timeval(cinterval, &ovalue->it_interval);
- }
+ set_cpu_itimer(tsk, CPUCLOCK_PROF, value, ovalue);
break;
default:
return -EINVAL;
return 0;
}
-asmlinkage long sys_setitimer(int which,
- struct itimerval __user *value,
- struct itimerval __user *ovalue)
+/**
+ * alarm_setitimer - set alarm in seconds
+ *
+ * @seconds: number of seconds until alarm
+ * 0 disables the alarm
+ *
+ * Returns the remaining time in seconds of a pending timer or 0 when
+ * the timer is not active.
+ *
+ * On 32 bit machines the seconds value is limited to (INT_MAX/2) to avoid
+ * negative timeval settings which would cause immediate expiry.
+ */
+unsigned int alarm_setitimer(unsigned int seconds)
+{
+ struct itimerval it_new, it_old;
+
+#if BITS_PER_LONG < 64
+ if (seconds > INT_MAX)
+ seconds = INT_MAX;
+#endif
+ it_new.it_value.tv_sec = seconds;
+ it_new.it_value.tv_usec = 0;
+ it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
+
+ do_setitimer(ITIMER_REAL, &it_new, &it_old);
+
+ /*
+ * We can't return 0 if we have an alarm pending ... And we'd
+ * better return too much than too little anyway
+ */
+ if ((!it_old.it_value.tv_sec && it_old.it_value.tv_usec) ||
+ it_old.it_value.tv_usec >= 500000)
+ it_old.it_value.tv_sec++;
+
+ return it_old.it_value.tv_sec;
+}
+
+SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value,
+ struct itimerval __user *, ovalue)
{
struct itimerval set_buffer, get_buffer;
int error;
return error;
if (copy_to_user(ovalue, &get_buffer, sizeof(get_buffer)))
- return -EFAULT;
+ return -EFAULT;
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff