From 8eba18428ac926f436064ac281e76d36d51bd631 Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Mon, 23 Sep 2013 16:25:06 -0500 Subject: [PATCH] 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 Reviewed-by: Dimitri Sivanich Reviewed-by: Hedi Berriche Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Jason Wessel Link: http://lkml.kernel.org/r/20130923212501.185052551@asylum.americas.sgi.com Signed-off-by: Ingo Molnar --- 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 6b964a0b86d1..8b1283daa332 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 2579fbd6b95c..c171ca533156 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 #include +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); -- 2.20.1