static int
xenoprof_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg,
struct pt_regs *regs, unsigned long stamp)
{
unsigned long ip = profile_pc(regs);
int event = arg->pmd_eventid;
struct vcpu *v = current;
int mode = xenoprofile_get_mode(v, regs);
// see pfm_do_interrupt_handler() in xen/arch/ia64/linux-xen/perfmon.c.
// It always passes task as NULL. This is work around
BUG_ON(task != NULL);
arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1;
if (!allow_virq || !allow_ints)
return 0;
// Note that log event actually expect cpu_user_regs, cast back
// appropriately when doing the backtrace implementation in ia64
xenoprof_log_event(v, regs, ip, mode, event);
// send VIRQ_XENOPROF
if (is_active(v->domain) && !xenoprof_is_xen_mode(v, regs) &&
!is_idle_vcpu(v))
send_guest_vcpu_virq(v, VIRQ_XENOPROF);
return 0;
}
static int ppro_check_ctrs(unsigned int const cpu,
struct op_msrs const * const msrs,
struct cpu_user_regs const * const regs)
{
u64 val;
int i;
int ovf = 0;
unsigned long eip = regs->eip;
int mode = xenoprofile_get_mode(current, regs);
struct arch_msr_pair *msrs_content = vcpu_vpmu(current)->context;
for (i = 0 ; i < num_counters; ++i) {
if (!reset_value[i])
continue;
rdmsrl(msrs->counters[i].addr, val);
if (CTR_OVERFLOWED(val)) {
xenoprof_log_event(current, regs, eip, mode, i);
wrmsrl(msrs->counters[i].addr, -reset_value[i]);
if ( is_passive(current->domain) && (mode != 2) &&
vpmu_is_set(vcpu_vpmu(current),
VPMU_PASSIVE_DOMAIN_ALLOCATED) )
{
if ( IS_ACTIVE(msrs_content[i].control) )
{
msrs_content[i].counter = val;
if ( IS_ENABLE(msrs_content[i].control) )
ovf = 2;
}
}
if ( !ovf )
ovf = 1;
}
}
/* Only P6 based Pentium M need to re-unmask the apic vector but it
* doesn't hurt other P6 variant */
apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);
return ovf;
}
