void __cpu_die(unsigned int cpu)
{
if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
pr_crit("CPU%u: cpu didn't die\n", cpu);
return;
}
pr_notice("CPU%u: shutdown\n", cpu);
if (!op_cpu_kill(cpu))
pr_warn("CPU%d may not have shut down cleanly\n", cpu);
}
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpu_die(unsigned int cpu)
{
if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
pr_crit("CPU%u: cpu didn't die\n", cpu);
return;
}
pr_notice("CPU%u: shutdown\n", cpu);
/*
* Now that the dying CPU is beyond the point of no return w.r.t.
* in-kernel synchronisation, try to get the firwmare to help us to
* verify that it has really left the kernel before we consider
* clobbering anything it might still be using.
*/
if (!op_cpu_kill(cpu))
pr_warn("CPU%d may not have shut down cleanly\n", cpu);
}
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpu_die(unsigned int cpu)
{
int err;
if (!cpu_wait_death(cpu, 5)) {
pr_crit("CPU%u: cpu didn't die\n", cpu);
return;
}
pr_notice("CPU%u: shutdown\n", cpu);
/*
* Now that the dying CPU is beyond the point of no return w.r.t.
* in-kernel synchronisation, try to get the firwmare to help us to
* verify that it has really left the kernel before we consider
* clobbering anything it might still be using.
*/
err = op_cpu_kill(cpu);
if (err)
pr_warn("CPU%d may not have shut down cleanly: %d\n",
cpu, err);
}
int __cpu_up(unsigned int cpu, struct task_struct *idle)
{
int ret;
long status;
/*
* We need to tell the secondary core where to find its stack and the
* page tables.
*/
secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
update_cpu_boot_status(CPU_MMU_OFF);
__flush_dcache_area(&secondary_data, sizeof(secondary_data));
/*
* Now bring the CPU into our world.
*/
ret = boot_secondary(cpu, idle);
if (ret == 0) {
/*
* CPU was successfully started, wait for it to come online or
* time out.
*/
wait_for_completion_timeout(&cpu_running,
msecs_to_jiffies(1000));
if (!cpu_online(cpu)) {
pr_crit("CPU%u: failed to come online\n", cpu);
ret = -EIO;
}
} else {
pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
}
secondary_data.stack = NULL;
status = READ_ONCE(secondary_data.status);
if (ret && status) {
if (status == CPU_MMU_OFF)
status = READ_ONCE(__early_cpu_boot_status);
switch (status) {
default:
pr_err("CPU%u: failed in unknown state : 0x%lx\n",
cpu, status);
break;
case CPU_KILL_ME:
if (!op_cpu_kill(cpu)) {
pr_crit("CPU%u: died during early boot\n", cpu);
break;
}
/* Fall through */
pr_crit("CPU%u: may not have shut down cleanly\n", cpu);
case CPU_STUCK_IN_KERNEL:
pr_crit("CPU%u: is stuck in kernel\n", cpu);
cpus_stuck_in_kernel++;
break;
case CPU_PANIC_KERNEL:
panic("CPU%u detected unsupported configuration\n", cpu);
}
}
return ret;
}