/**
* smp_startup_cpu() - start the given cpu
*
* At boot time, there is nothing to do for primary threads which were
* started from Open Firmware. For anything else, call RTAS with the
* appropriate start location.
*
* Returns:
* 0 - failure
* 1 - success
*/
static inline int smp_startup_cpu(unsigned int lcpu)
{
int status;
unsigned long start_here =
__pa(ppc_function_entry(generic_secondary_smp_init));
unsigned int pcpu;
int start_cpu;
if (cpumask_test_cpu(lcpu, of_spin_mask))
/* Already started by OF and sitting in spin loop */
return 1;
pcpu = get_hard_smp_processor_id(lcpu);
/* Check to see if the CPU out of FW already for kexec */
if (smp_query_cpu_stopped(pcpu) == QCSS_NOT_STOPPED){
cpumask_set_cpu(lcpu, of_spin_mask);
return 1;
}
/* Fixup atomic count: it exited inside IRQ handler. */
task_thread_info(paca[lcpu].__current)->preempt_count = 0;
#ifdef CONFIG_HOTPLUG_CPU
if (get_cpu_current_state(lcpu) == CPU_STATE_INACTIVE)
goto out;
#endif
/*
* If the RTAS start-cpu token does not exist then presume the
* cpu is already spinning.
*/
start_cpu = rtas_token("start-cpu");
if (start_cpu == RTAS_UNKNOWN_SERVICE)
return 1;
status = rtas_call(start_cpu, 3, 1, NULL, pcpu, start_here, pcpu);
if (status != 0) {
printk(KERN_ERR "start-cpu failed: %i\n", status);
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
out:
#endif
return 1;
}
/*
* pseries_cpu_die: Wait for the cpu to die.
* @cpu: logical processor id of the CPU whose death we're awaiting.
*
* This function is called from the context of the thread which is performing
* the cpu-offline. Here we wait for long enough to allow the cpu in question
* to self-destroy so that the cpu-offline thread can send the CPU_DEAD
* notifications.
*
* OTOH, pseries_mach_cpu_die() is called by the @cpu when it wants to
* self-destruct.
*/
static void pseries_cpu_die(unsigned int cpu)
{
int tries;
int cpu_status = 1;
unsigned int pcpu = get_hard_smp_processor_id(cpu);
if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {
cpu_status = 1;
for (tries = 0; tries < 5000; tries++) {
if (get_cpu_current_state(cpu) == CPU_STATE_INACTIVE) {
cpu_status = 0;
break;
}
msleep(1);
}
} else if (get_preferred_offline_state(cpu) == CPU_STATE_OFFLINE) {
for (tries = 0; tries < 25; tries++) {
cpu_status = smp_query_cpu_stopped(pcpu);
if (cpu_status == QCSS_STOPPED ||
cpu_status == QCSS_HARDWARE_ERROR)
break;
cpu_relax();
}
}
if (cpu_status != 0) {
printk("Querying DEAD? cpu %i (%i) shows %i\n",
cpu, pcpu, cpu_status);
}
/* Isolation and deallocation are definitely done by
* drslot_chrp_cpu. If they were not they would be
* done here. Change isolate state to Isolate and
* change allocation-state to Unusable.
*/
paca[cpu].cpu_start = 0;
}
