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x86/UV: Add uvtrace support

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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>
This commit is contained in:
Mike Travis 2013-09-23 16:25:06 -05:00 committed by Ingo Molnar
parent 12ba6c990f
commit 8eba18428a
2 changed files with 20 additions and 1 deletions
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8
arch/x86/include/asm/uv/uv.h
View File

@ -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,

13
arch/x86/platform/uv/uv_nmi.c
View File

@ -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);