diff options
| author | David S. Miller <davem@davemloft.net> | 2008-05-19 23:46:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-05-20 00:33:45 -0700 |
| commit | 93dae5b70e7c1c8e927d22e1c20a941ca376906a (patch) | |
| tree | f255087706b9d176455b17e4384f4632f59f4cde /include/asm-sparc64/smp.h | |
| parent | 88278ca27a43ae503572b52ea2c171fbf45db5a2 (diff) | |
sparc64: Add global register dumping facility.
When a cpu really is stuck in the kernel, it can be often
impossible to figure out which cpu is stuck where. The
worst case is when the stuck cpu has interrupts disabled.
Therefore, implement a global cpu state capture that uses
SMP message interrupts which are not disabled by the
normal IRQ enable/disable APIs of the kernel.
As long as we can get a sysrq 'y' to the kernel, we can
get a dump. Even if the console interrupt cpu is wedged,
we can trigger it from userspace using /proc/sysrq-trigger
The output is made compact so that this facility is more
useful on high cpu count systems, which is where this
facility will likely find itself the most useful :)
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/smp.h')
| -rw-r--r-- | include/asm-sparc64/smp.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-sparc64/smp.h b/include/asm-sparc64/smp.h index 1c1c5ea5cea5..cd0311b2e19d 100644 --- a/include/asm-sparc64/smp.h +++ b/include/asm-sparc64/smp.h @@ -1,6 +1,6 @@ /* smp.h: Sparc64 specific SMP stuff. * - * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net) */ #ifndef _SPARC64_SMP_H @@ -44,6 +44,8 @@ extern int hard_smp_processor_id(void); extern void smp_fill_in_sib_core_maps(void); extern void cpu_play_dead(void); +extern void smp_fetch_global_regs(void); + #ifdef CONFIG_HOTPLUG_CPU extern int __cpu_disable(void); extern void __cpu_die(unsigned int cpu); @@ -55,6 +57,7 @@ extern void __cpu_die(unsigned int cpu); #define hard_smp_processor_id() 0 #define smp_fill_in_sib_core_maps() do { } while (0) +#define smp_fetch_global_regs() do { } while (0) #endif /* !(CONFIG_SMP) */ |