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x86: Enable NMI on all cpus on UV

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Enable NMI on all cpus in UV system and add an NMI handler
to dump_stack on each cpu.

By default on x86 all the cpus except the boot cpu have NMI
masked off.  This patch enables NMI on all cpus in UV system
and adds an NMI handler to dump_stack on each cpu.  This
way if a system hangs we can NMI the machine and get a
backtrace from all the cpus.

Version 2: Use x86_platform driver mechanism for nmi init, per
           Ingo's suggestion.

Version 3: Clean up Ingo's nits.

Signed-off-by: Russ Anderson <rja@sgi.com>
LKML-Reference: <20100226164912.GA24439@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Russ Anderson
2010-02-26 10:49:12 -06:00
committed by Ingo Molnar
parent 36028f3383
commit 78c0617646
5 changed files with 51 additions and 0 deletions
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2
arch/x86/include/asm/x86_init.h
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@@ -126,6 +126,7 @@ struct x86_cpuinit_ops {
* @get_wallclock: get time from HW clock like RTC etc.
* @set_wallclock: set time back to HW clock
* @is_untracked_pat_range exclude from PAT logic
* @nmi_init enable NMI on cpus
*/
struct x86_platform_ops {
unsigned long (*calibrate_tsc)(void);
@@ -133,6 +134,7 @@ struct x86_platform_ops {
int (*set_wallclock)(unsigned long nowtime);
void (*iommu_shutdown)(void);
bool (*is_untracked_pat_range)(u64 start, u64 end);
void (*nmi_init)(void);
};
extern struct x86_init_ops x86_init;