x86/UV: Add uvtrace support
This patch adds support for the uvtrace module by providing a
skeleton call to the registered trace function. It also
provides another separate 'NMI' tracer that is triggered by the
system wide 'power nmi' command.
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/20130923212501.185052551@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index 2579fbd..c171ca5 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -1,5 +1,5 @@
/*
- * SGI NMI support routines
+ * SGI NMI/TRACE support routines
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -36,6 +36,13 @@
#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_mmrs.h>
+void (*uv_trace_func)(const char *f, const int l, const char *fmt, ...);
+EXPORT_SYMBOL(uv_trace_func);
+
+void (*uv_trace_nmi_func)(unsigned int reason, struct pt_regs *regs);
+EXPORT_SYMBOL(uv_trace_nmi_func);
+
+
/*
* UV handler for NMI
*
@@ -551,6 +558,10 @@
return NMI_DONE;
}
+ /* Call possible NMI trace function */
+ if (unlikely(uv_trace_nmi_func))
+ (uv_trace_nmi_func)(reason, regs);
+
/* Indicate we are the first CPU into the NMI handler */
master = (atomic_read(&uv_nmi_cpu) == cpu);