ipmi: add new IPMI nmi watchdog handling

Convert over to the new NMI handling for getting IPMI watchdog timeouts via an
NMI.  This add config options to know if there is the ability to receive NMIs
and if it has an NMI post processing call.  Then it modifies the IPMI watchdog
to take advantage of this so that it can know if an NMI comes in.

It also adds testing that the IPMI NMI watchdog works.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 7 insertions, 0 deletions

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index f21b41e7770c..58c8e015e77e 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -747,6 +747,11 @@ static __kprobes void default_do_nmi(struct pt_regs * regs)
                  */
                 if (nmi_watchdog_tick(regs, reason))
                         return;
+#endif
+                if (notify_die(DIE_NMI_POST, "nmi_post", regs, reason, 2, 0)
+                                                        == NOTIFY_STOP)
+                        return;
+#ifdef CONFIG_X86_LOCAL_APIC
                 if (!do_nmi_callback(regs, smp_processor_id()))
 #endif
                         unknown_nmi_error(reason, regs);
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index d76fc32d4599..0484a2ceac87 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -792,6 +792,8 @@ asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
                  */
                 if (nmi_watchdog_tick(regs,reason))
                         return;
+                if (notify_die(DIE_NMI_POST, "nmi_post", regs, reason, 2, 0)
+                                                                == NOTIFY_STOP)
                 if (!do_nmi_callback(regs,cpu))
                         unknown_nmi_error(reason, regs);