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Subject[tip:x86/uv] x86/UV: Add uvtrace support
Commit-ID:  8eba18428ac926f436064ac281e76d36d51bd631
Gitweb: http://git.kernel.org/tip/8eba18428ac926f436064ac281e76d36d51bd631
Author: Mike Travis <travis@sgi.com>
AuthorDate: Mon, 23 Sep 2013 16:25:06 -0500
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 24 Sep 2013 09:02:04 +0200

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>
---
arch/x86/include/asm/uv/uv.h | 8 ++++++++
arch/x86/platform/uv/uv_nmi.c | 13 ++++++++++++-
2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h
index 6b964a0..8b1283d 100644
--- a/arch/x86/include/asm/uv/uv.h
+++ b/arch/x86/include/asm/uv/uv.h
@@ -14,6 +14,13 @@ extern void uv_cpu_init(void);
extern void uv_nmi_init(void);
extern void uv_register_nmi_notifier(void);
extern void uv_system_init(void);
+extern void (*uv_trace_nmi_func)(unsigned int reason, struct pt_regs *regs);
+extern void (*uv_trace_func)(const char *f, const int l, const char *fmt, ...);
+#define uv_trace(fmt, ...) \
+do { \
+ if (unlikely(uv_trace_func)) \
+ (uv_trace_func)(__func__, __LINE__, fmt, ##__VA_ARGS__);\
+} while (0)
extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long start,
@@ -26,6 +33,7 @@ static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
static inline int is_uv_system(void) { return 0; }
static inline void uv_cpu_init(void) { }
static inline void uv_system_init(void) { }
+static inline void uv_trace(void *fmt, ...) { }
static inline void uv_register_nmi_notifier(void) { }
static inline const struct cpumask *
uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm,
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 @@ int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
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);


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