/*
* Halt all running cpus, excluding current cpu.
*/
void
cpu_halt_others(void)
{
kcpuset_t *kcp;
// If we are the only CPU running, there's nothing to do.
if (kcpuset_match(cpus_running, curcpu()->ci_data.cpu_kcpuset))
return;
// Get all running CPUs
kcpuset_clone(&kcp, cpus_running);
// Remove ourself
kcpuset_remove(kcp, curcpu()->ci_data.cpu_kcpuset);
// Remove any halted CPUs
kcpuset_remove(kcp, cpus_halted);
// If there are CPUs left, send the IPIs
if (!kcpuset_iszero(kcp)) {
cpu_multicast_ipi(kcp, IPI_HALT);
cpu_ipi_wait("halt", cpus_halted, kcp);
}
kcpuset_destroy(kcp);
/*
* TBD
* Depending on available firmware methods, other cpus will
* either shut down themselves, or spin and wait for us to
* stop them.
*/
}
/*
* pserialize_perform:
*
* Perform the write side of passive serialization. The calling
* thread holds an exclusive lock on the data object(s) being updated.
* We wait until every processor in the system has made at least two
* passes through cpu_swichto(). The wait is made with the caller's
* update lock held, but is short term.
*/
void
pserialize_perform(pserialize_t psz)
{
uint64_t xc;
KASSERT(!cpu_intr_p());
KASSERT(!cpu_softintr_p());
if (__predict_false(panicstr != NULL)) {
return;
}
KASSERT(psz->psz_owner == NULL);
KASSERT(ncpu > 0);
/*
* Set up the object and put it onto the queue. The lock
* activity here provides the necessary memory barrier to
* make the caller's data update completely visible to
* other processors.
*/
psz->psz_owner = curlwp;
kcpuset_copy(psz->psz_target, kcpuset_running);
kcpuset_zero(psz->psz_pass);
mutex_spin_enter(&psz_lock);
TAILQ_INSERT_TAIL(&psz_queue0, psz, psz_chain);
psz_work_todo++;
do {
mutex_spin_exit(&psz_lock);
/*
* Force some context switch activity on every CPU, as
* the system may not be busy. Pause to not flood.
*/
xc = xc_broadcast(XC_HIGHPRI, (xcfunc_t)nullop, NULL, NULL);
xc_wait(xc);
kpause("psrlz", false, 1, NULL);
mutex_spin_enter(&psz_lock);
} while (!kcpuset_iszero(psz->psz_target));
psz_ev_excl.ev_count++;
mutex_spin_exit(&psz_lock);
psz->psz_owner = NULL;
}
struct intrids_handler *
interrupt_construct_intrids(const kcpuset_t *cpuset)
{
struct intr_source *is;
struct intrids_handler *ii_handler;
intrid_t *ids;
int i, irq, count;
if (kcpuset_iszero(cpuset))
return NULL;
if (!kcpuset_isset(cpuset, 0)) /* XXX */
return NULL;
count = 0;
for (irq = 0, is = intrsources; irq < NVIRQ; irq++, is++) {
if (is->is_hand != NULL)
count++;
}
ii_handler = kmem_zalloc(sizeof(int) + sizeof(intrid_t) * count,
KM_SLEEP);
if (ii_handler == NULL)
return NULL;
ii_handler->iih_nids = count;
if (count == 0)
return ii_handler;
ids = ii_handler->iih_intrids;
i = 0;
for (irq = 0, is = intrsources; irq < NVIRQ; irq++, is++) {
/* Ignore devices attached after counting "count". */
if (i >= count)
break;
if (is->is_hand == NULL)
continue;
strncpy(ids[i], is->is_source, sizeof(intrid_t));
i++;
}
return ii_handler;
}
