static void crash_kexec_prepare_cpus(int cpu)
{
unsigned int msecs;
unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
crash_send_ipi(crash_ipi_callback);
smp_wmb();
printk(KERN_EMERG "Sending IPI to other cpus...\n");
msecs = 10000;
while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
cpu_relax();
mdelay(1);
}
/* Would it be better to replace the trap vector here? */
if (cpus_weight(cpus_in_crash) < ncpus) {
printk(KERN_EMERG "done waiting: %d cpu(s) not responding\n",
ncpus - cpus_weight(cpus_in_crash));
printk(KERN_EMERG "Activate soft-reset to stop other cpu(s)\n");
cpus_in_sr = CPU_MASK_NONE;
atomic_set(&enter_on_soft_reset, 0);
while (cpus_weight(cpus_in_crash) < ncpus)
cpu_relax();
}
/*
* Make sure all CPUs are entered via soft-reset if the kdump is
* invoked using soft-reset.
*/
if (cpu_isset(cpu, cpus_in_sr))
crash_soft_reset_check(cpu);
/* Leave the IPI callback set */
}
static void crash_kexec_prepare_cpus(int cpu)
{
unsigned int msecs;
unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
crash_send_ipi(crash_ipi_callback);
smp_wmb();
/*
* FIXME: Until we will have the way to stop other CPUSs reliabally,
* the crash CPU will send an IPI and wait for other CPUs to
* respond.
* Delay of at least 10 seconds.
*/
printk(KERN_EMERG "Sending IPI to other cpus...\n");
msecs = 10000;
while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
cpu_relax();
mdelay(1);
}
/* Would it be better to replace the trap vector here? */
/*
* FIXME: In case if we do not get all CPUs, one possibility: ask the
* user to do soft reset such that we get all.
* Soft-reset will be used until better mechanism is implemented.
*/
if (cpus_weight(cpus_in_crash) < ncpus) {
printk(KERN_EMERG "done waiting: %d cpu(s) not responding\n",
ncpus - cpus_weight(cpus_in_crash));
printk(KERN_EMERG "Activate soft-reset to stop other cpu(s)\n");
cpus_in_sr = CPU_MASK_NONE;
atomic_set(&enter_on_soft_reset, 0);
while (cpus_weight(cpus_in_crash) < ncpus)
cpu_relax();
}
/*
* Make sure all CPUs are entered via soft-reset if the kdump is
* invoked using soft-reset.
*/
if (cpu_isset(cpu, cpus_in_sr))
crash_soft_reset_check(cpu);
/* Leave the IPI callback set */
}
static void crash_kexec_prepare_cpus(int cpu)
{
unsigned int msecs;
unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
int tries = 0;
int (*old_handler)(struct pt_regs *regs);
printk(KERN_EMERG "Sending IPI to other CPUs\n");
crash_send_ipi(crash_ipi_callback);
smp_wmb();
again:
/*
* FIXME: Until we will have the way to stop other CPUs reliably,
* the crash CPU will send an IPI and wait for other CPUs to
* respond.
*/
msecs = IPI_TIMEOUT;
while ((atomic_read(&cpus_in_crash) < ncpus) && (--msecs > 0))
mdelay(1);
/* Would it be better to replace the trap vector here? */
if (atomic_read(&cpus_in_crash) >= ncpus) {
printk(KERN_EMERG "IPI complete\n");
return;
}
printk(KERN_EMERG "ERROR: %d cpu(s) not responding\n",
ncpus - atomic_read(&cpus_in_crash));
/*
* If we have a panic timeout set then we can't wait indefinitely
* for someone to activate system reset. We also give up on the
* second time through if system reset fail to work.
*/
if ((panic_timeout > 0) || (tries > 0))
return;
/*
* A system reset will cause all CPUs to take an 0x100 exception.
* The primary CPU returns here via setjmp, and the secondary
* CPUs reexecute the crash_kexec_secondary path.
*/
old_handler = __debugger;
__debugger = handle_fault;
crash_shutdown_cpu = smp_processor_id();
if (setjmp(crash_shutdown_buf) == 0) {
printk(KERN_EMERG "Activate system reset (dumprestart) "
"to stop other cpu(s)\n");
/*
* A system reset will force all CPUs to execute the
* crash code again. We need to reset cpus_in_crash so we
* wait for everyone to do this.
*/
atomic_set(&cpus_in_crash, 0);
smp_mb();
while (atomic_read(&cpus_in_crash) < ncpus)
cpu_relax();
}
crash_shutdown_cpu = -1;
__debugger = old_handler;
tries++;
goto again;
}
