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x86, NMI: Add knob to disable using NMI IPIs to stop cpus 

Some machines may exhibit problems using the NMI to stop other
cpus. This knob just allows one to revert back to the original
behaviour to help diagnose the problem.

V2:
  make function static

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Cc: seiji.aguchi@hds.com
Cc: vgoyal@redhat.com
Cc: mjg@redhat.com
Cc: tony.luck@intel.com
Cc: gong.chen@intel.com
Cc: satoru.moriya@hds.com
Cc: avi@redhat.com
Cc: Andi Kleen <andi@firstfloor.org>
Link: http://lkml.kernel.org/r/1318533267-18880-4-git-send-email-dzickus@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Don Zickus 2011-10-13 15:14:27 -04:00 committed by Ingo Molnar
parent 99e8b9ca90
commit bda6263398
2 changed files with 17 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
View File

@ -1796,6 +1796,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nomfgpt [X86-32] Disable Multi-Function General Purpose
Timer usage (for AMD Geode machines).
nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to
shutdown the other cpus. Instead use the REBOOT_VECTOR
irq.
nopat [X86] Disable PAT (page attribute table extension of
pagetables) support.

13
arch/x86/kernel/smp.c
View File

@ -249,6 +249,11 @@ static void native_irq_stop_other_cpus(int wait)
local_irq_restore(flags);
}
static void native_smp_disable_nmi_ipi(void)
{
smp_ops.stop_other_cpus = native_irq_stop_other_cpus;
}
/*
* Reschedule call back.
*/
@ -280,6 +285,14 @@ void smp_call_function_single_interrupt(struct pt_regs *regs)
irq_exit();
}
static int __init nonmi_ipi_setup(char *str)
{
native_smp_disable_nmi_ipi();
return 1;
}
__setup("nonmi_ipi", nonmi_ipi_setup);
struct smp_ops smp_ops = {
.smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
.smp_prepare_cpus = native_smp_prepare_cpus,