static inline void vperfctr_resume_with_overflow_check(struct vperfctr *perfctr)
{
#ifdef CONFIG_PERFCTR_INTERRUPT_SUPPORT
if (perfctr_cpu_has_pending_interrupt(&perfctr->cpu_state)) {
vperfctr_handle_overflow(current, perfctr);
return;
}
#endif
vperfctr_resume(perfctr);
}
/* PREEMPT note: called in IRQ context with preemption disabled. */
static void vperfctr_ihandler(unsigned long pc)
{
struct task_struct *tsk = current;
struct vperfctr *perfctr;
perfctr = tsk->arch.thread.perfctr;
if (!perfctr) {
printk(KERN_ERR "%s: BUG! pid %d has no vperfctr\n",
__FUNCTION__, tsk->id);
return;
}
if (!perfctr_cstatus_has_ictrs(perfctr->cpu_state.user.cstatus)) {
printk(KERN_ERR "%s: BUG! vperfctr has cstatus %#x (pid %d, comm %s)\n",
__FUNCTION__, perfctr->cpu_state.user.cstatus, tsk->id, tsk->comm);
return;
}
vperfctr_suspend(perfctr);
vperfctr_handle_overflow(tsk, perfctr);
}
// PREEMPT note: called in IRQ context with preemption disabled.
static void vperfctr_ihandler(unsigned long pc)
{
struct task_struct *tsk = current;
struct vperfctr *perfctr;
unsigned int pmc, cstatus, now = 0;
int i;
perfctr = tsk->thread.perfctr;
if (!perfctr) {
return;
}
if (!perfctr_cstatus_has_ictrs(perfctr->cpu_state.cstatus)) {
return;
}
// if someone has really overflown then continue else return
// just read, don't freeze them
cstatus = perfctr->cpu_state.cstatus;
for (i = perfctr_cstatus_nractrs(cstatus); (i < perfctr_cstatus_nrctrs(cstatus)) && ((int)now >= 0); ++i) {
pmc = perfctr->cpu_state.pmc[i].map;
now = read_pmc(pmc);
}
if ((int)now >= 0) {
return;
}
// Fine, we are suspending the counters and reading them. vperfctr_suspend()
// in turn invokes _suspend() on i-mode ctrs (where they are frozen and read)
// and a-mode counters (where they are just read)
vperfctr_suspend(perfctr);
// Ok, Signal to the userland is sent in the following routine. But before that
// the following routine calls vperfctr_resume() if the TSC counting is on.
// what happens in that resume is just the TSC value is read and stored in the
// 'start' state of the TSC
vperfctr_handle_overflow(tsk, perfctr);
}
