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This patch restores the capability to enter KDB (and KGDB) from the UV NMI handler. This is needed because the UV system console is not capable of sending the 'break' signal to the serial console port. It is also useful when the kernel is hung in such a way that it isn't responding to normal external I/O, so sending 'g' to sysreq-trigger does not work either. Another benefit of the external NMI command is that all the cpus receive the NMI signal at roughly the same time so they are more closely aligned timewise. It utilizes the newly added kgdb_nmicallin function to gain entry to KGDB/KDB by the master. The slaves still enter via the standard kgdb_nmicallback function. It also uses the new 'send_ready' pointer to tell KGDB/KDB to signal the slaves when to proceed into the KGDB slave loop. It is enabled when the nmi action is set to "kdb" and the kernel is built with CONFIG_KDB enabled. Note that if kgdb is connected that interface will be used instead. Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Dimitri Sivanich <sivanich@sgi.com> Reviewed-by: Hedi Berriche <hedi@sgi.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Jason Wessel <jason.wessel@windriver.com> Link: http://lkml.kernel.org/r/20131002151418.089692683@asylum.americas.sgi.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| bios_uv.c | ||
| Makefile | ||
| tlb_uv.c | ||
| uv_irq.c | ||
| uv_nmi.c | ||
| uv_sysfs.c | ||
| uv_time.c | ||