[PATCH] x86-64: Allow to run a program when a machine check event is detected

When a machine check event is detected (including a AMD RevF threshold
overflow event) allow to run a "trigger" program. This allows user space
to react to such events sooner.

The trigger is configured using a new trigger entry in the
machinecheck sysfs interface. It is currently shared between
all CPUs.

I also fixed the AMD threshold handler to run the machine
check polling code immediately to actually log any events
that might have caused the threshold interrupt.

Also added some documentation for the mce sysfs interface.

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/mce_amd.c b/arch/x86_64/kernel/mce_amd.c
index cd8dbe57b33a..d0bd5d66e103 100644
--- a/arch/x86_64/kernel/mce_amd.c
+++ b/arch/x86_64/kernel/mce_amd.c
@@ -220,6 +220,10 @@ asmlinkage void mce_threshold_interrupt(void)
                              (high & MASK_LOCKED_HI))
                                 continue;
 
+                        /* Log the machine check that caused the threshold
+                           event. */
+                        do_machine_check(NULL, 0);
+
                         if (high & MASK_OVERFLOW_HI) {
                                 rdmsrl(address, m.misc);
                                 rdmsrl(MSR_IA32_MC0_STATUS + bank * 4,