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| author | Andi Kleen <andi@firstfloor.org> | 2009-05-27 21:56:54 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-06-03 14:44:05 -0700 |
| commit | ccc3c3192ae78dd56dcdf5353fd1a9ef5f9a3e2b (patch) | |
| tree | 65f380bd68bdd496f42ac8de88ccb74e340cc968 /arch/x86/kernel/entry_64.S | |
| parent | bd19a5e6b73df276e1ccedf9059e9ee70c372d7d (diff) | |
| download | blackbird-op-linux-ccc3c3192ae78dd56dcdf5353fd1a9ef5f9a3e2b.tar.gz blackbird-op-linux-ccc3c3192ae78dd56dcdf5353fd1a9ef5f9a3e2b.zip | |
x86, mce: implement bootstrapping for machine check wakeups
Machine checks support waking up the mcelog daemon quickly.
The original wake up code for this was pretty ugly, relying on
a idle notifier and a special process flag. The reason it did
it this way is that the machine check handler is not subject
to normal interrupt locking rules so it's not safe
to call wake_up(). Instead it set a process flag
and then either did the wakeup in the syscall return
or in the idle notifier.
This patch adds a new "bootstraping" method as replacement.
The idea is that the handler checks if it's in a state where
it is unsafe to call wake_up(). If it's safe it calls it directly.
When it's not safe -- that is it interrupted in a critical
section with interrupts disables -- it uses a new "self IPI" to trigger
an IPI to its own CPU. This can be done safely because IPI
triggers are atomic with some care. The IPI is raised
once the interrupts are reenabled and can then safely call
wake_up().
When APICs are disabled the event is just queued and will be picked up
eventually by the next polling timer. I think that's a reasonable
compromise, since it should only happen quite rarely.
Contains fixes from Ying Huang.
[ solve conflict on irqinit, make it work on 32bit (entry_arch.h) - HS ]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index a31a7f29cffe..711c130a8411 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1011,6 +1011,11 @@ apicinterrupt THRESHOLD_APIC_VECTOR \ apicinterrupt THERMAL_APIC_VECTOR \ thermal_interrupt smp_thermal_interrupt +#ifdef CONFIG_X86_MCE +apicinterrupt MCE_SELF_VECTOR \ + mce_self_interrupt smp_mce_self_interrupt +#endif + #ifdef CONFIG_SMP apicinterrupt CALL_FUNCTION_SINGLE_VECTOR \ call_function_single_interrupt smp_call_function_single_interrupt |
