ARM: 7616/1: cache-l2x0: aurora: Use writel_relaxed instead of writel
[linux-3.10.git] / kernel / itimer.c
index 58762f7..8d262b4 100644 (file)
@@ -12,6 +12,7 @@
 #include <linux/time.h>
 #include <linux/posix-timers.h>
 #include <linux/hrtimer.h>
+#include <trace/events/timer.h>
 
 #include <asm/uaccess.h>
 
@@ -41,10 +42,43 @@ static struct timeval itimer_get_remtime(struct hrtimer *timer)
        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 (cval) {
+               struct task_cputime cputime;
+               cputime_t t;
+
+               thread_group_cputimer(tsk, &cputime);
+               if (clock_id == CPUCLOCK_PROF)
+                       t = cputime.utime + cputime.stime;
+               else
+                       /* CPUCLOCK_VIRT */
+                       t = cputime.utime;
+
+               if (cval < t)
+                       /* about to fire */
+                       cval = cputime_one_jiffy;
+               else
+                       cval = 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:
@@ -55,44 +89,10 @@ int do_getitimer(int which, struct itimerval *value)
                spin_unlock_irq(&tsk->sighand->siglock);
                break;
        case ITIMER_VIRTUAL:
-               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_cputime cputime;
-                       cputime_t utime;
-
-                       thread_group_cputimer(tsk, &cputime);
-                       utime = cputime.utime;
-                       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);
-               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:
-               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_cputime times;
-                       cputime_t ptime;
-
-                       thread_group_cputimer(tsk, &times);
-                       ptime = cputime_add(times.utime, times.stime);
-                       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);
-               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);
@@ -123,11 +123,64 @@ enum hrtimer_restart it_real_fn(struct hrtimer *timer)
        struct signal_struct *sig =
                container_of(timer, struct signal_struct, real_timer);
 
+       trace_itimer_expire(ITIMER_REAL, sig->leader_pid, 0);
        kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
 
        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];
+
+       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 (cval || nval) {
+               if (nval > 0)
+                       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);
+       }
+}
+
 /*
  * Returns true if the timeval is in canonical form
  */
@@ -139,7 +192,6 @@ 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.
@@ -171,51 +223,14 @@ again:
                } 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);
-               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);
-               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);
-               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);
-               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;
@@ -269,8 +284,12 @@ SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value,
        if (value) {
                if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))
                        return -EFAULT;
-       } else
-               memset((char *) &set_buffer, 0, sizeof(set_buffer));
+       } else {
+               memset(&set_buffer, 0, sizeof(set_buffer));
+               printk_once(KERN_WARNING "%s calls setitimer() with new_value NULL pointer."
+                           " Misfeature support will be removed\n",
+                           current->comm);
+       }
 
        error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);
        if (error || !ovalue)