/*
* Update cpu_present_map and paca(s) for a new cpu node. The wrinkle
* here is that a cpu device node may represent up to two logical cpus
* in the SMT case. We must honor the assumption in other code that
* the logical ids for sibling SMT threads x and y are adjacent, such
* that x^1 == y and y^1 == x.
*/
static int pSeries_add_processor(struct device_node *np)
{
unsigned int cpu;
cpumask_t candidate_map, tmp = CPU_MASK_NONE;
int err = -ENOSPC, len, nthreads, i;
u32 *intserv;
intserv = (u32 *)get_property(np, "ibm,ppc-interrupt-server#s", &len);
if (!intserv)
return 0;
nthreads = len / sizeof(u32);
for (i = 0; i < nthreads; i++)
cpu_set(i, tmp);
lock_cpu_hotplug();
BUG_ON(!cpus_subset(cpu_present_map, cpu_possible_map));
/* Get a bitmap of unoccupied slots. */
cpus_xor(candidate_map, cpu_possible_map, cpu_present_map);
if (cpus_empty(candidate_map)) {
/* If we get here, it most likely means that NR_CPUS is
* less than the partition's max processors setting.
*/
printk(KERN_ERR "Cannot add cpu %s; this system configuration"
" supports %d logical cpus.\n", np->full_name,
cpus_weight(cpu_possible_map));
goto out_unlock;
}
while (!cpus_empty(tmp))
if (cpus_subset(tmp, candidate_map))
/* Found a range where we can insert the new cpu(s) */
break;
else
cpus_shift_left(tmp, tmp, nthreads);
if (cpus_empty(tmp)) {
printk(KERN_ERR "Unable to find space in cpu_present_map for"
" processor %s with %d thread(s)\n", np->name,
nthreads);
goto out_unlock;
}
for_each_cpu_mask(cpu, tmp) {
BUG_ON(cpu_isset(cpu, cpu_present_map));
cpu_set(cpu, cpu_present_map);
set_hard_smp_processor_id(cpu, *intserv++);
}
static int get_irq_server(unsigned int virq, cpumask_t cpumask,
unsigned int strict_check)
{
int server;
/* For the moment only implement delivery to all cpus or one cpu */
cpumask_t tmp = CPU_MASK_NONE;
if (!distribute_irqs)
return default_server;
if (!cpus_subset(cpu_possible_map, cpumask)) {
cpus_and(tmp, cpu_online_map, cpumask);
server = first_cpu(tmp);
if (server < NR_CPUS)
return get_hard_smp_processor_id(server);
if (strict_check)
return -1;
}
if (cpus_equal(cpu_online_map, cpu_present_map))
return default_distrib_server;
return default_server;
}
/* Called from set_cpus_allowed().
* PRE: current holds task_lock(owner)
* PRE: owner->thread.perfctr == perfctr
*/
void __vperfctr_set_cpus_allowed(struct task_struct *owner,
struct vperfctr *perfctr,
cpumask_t new_mask)
{
if (!cpus_subset(new_mask, perfctr->cpumask)) {
atomic_set(&perfctr->bad_cpus_allowed, 1);
printk(KERN_WARNING "perfctr: process %d (comm %s) issued unsafe"
" set_cpus_allowed() on process %d (comm %s)\n",
current->pid, current->comm, owner->pid, owner->comm);
} else
atomic_set(&perfctr->bad_cpus_allowed, 0);
}
//Huh? This seems to be used on ia64 even if !CONFIG_SMP
void smp_send_event_check_mask(const cpumask_t *mask)
{
int cpu;
/* Not for me. */
if (cpus_subset(*mask, *cpumask_of(smp_processor_id())))
return;
//printf("smp_send_event_check_mask called\n");
for (cpu = 0; cpu < NR_CPUS; ++cpu)
if (cpu_isset(cpu, *mask) && cpu != smp_processor_id())
platform_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0);
}