/* Bring up a remote CPU */
int __cpu_up(unsigned int cpu)
{
int rc;
printk("Bringing up CPU%d\n", cpu);
rc = init_secondary_pagetables(cpu);
if ( rc < 0 )
return rc;
console_start_sync(); /* Secondary may use early_printk */
/* Tell the remote CPU which stack to boot on. */
init_data.stack = idle_vcpu[cpu]->arch.stack;
/* Tell the remote CPU what is it's logical CPU ID */
init_data.cpuid = cpu;
/* Open the gate for this CPU */
smp_up_cpu = cpu_logical_map(cpu);
flush_xen_dcache(smp_up_cpu);
rc = arch_cpu_up(cpu);
console_end_sync();
if ( rc < 0 )
{
printk("Failed to bring up CPU%d\n", cpu);
return rc;
}
while ( !cpu_online(cpu) )
{
cpu_relax();
process_pending_softirqs();
}
return 0;
}
/* Bring up a remote CPU */
int __cpu_up(unsigned int cpu)
{
int rc;
s_time_t deadline;
printk("Bringing up CPU%d\n", cpu);
rc = init_secondary_pagetables(cpu);
if ( rc < 0 )
return rc;
console_start_sync(); /* Secondary may use early_printk */
/* Tell the remote CPU which stack to boot on. */
init_data.stack = idle_vcpu[cpu]->arch.stack;
/* Tell the remote CPU what its logical CPU ID is. */
init_data.cpuid = cpu;
/* Open the gate for this CPU */
smp_up_cpu = cpu_logical_map(cpu);
clean_dcache(smp_up_cpu);
rc = arch_cpu_up(cpu);
console_end_sync();
if ( rc < 0 )
{
printk("Failed to bring up CPU%d\n", cpu);
return rc;
}
deadline = NOW() + MILLISECS(1000);
while ( !cpu_online(cpu) && NOW() < deadline )
{
cpu_relax();
process_pending_softirqs();
}
/*
* Nuke start of day info before checking one last time if the CPU
* actually came online. If it is not online it may still be
* trying to come up and may show up later unexpectedly.
*
* This doesn't completely avoid the possibility of the supposedly
* failed CPU trying to progress with another CPUs stack settings
* etc, but better than nothing, hopefully.
*/
init_data.stack = NULL;
init_data.cpuid = ~0;
smp_up_cpu = MPIDR_INVALID;
clean_dcache(smp_up_cpu);
if ( !cpu_online(cpu) )
{
printk("CPU%d never came online\n", cpu);
return -EIO;
}
return 0;
}
