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perf/x86/intel/pt: Add interface to stop Intel PT logging

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This patch add a function for external components to stop Intel PT.
Basically this function is used when kernel panic occurs. When it is
called, the intel_pt driver disables Intel PT and saves its registers
using pt_event_stop(), which is also used by pmu.stop handler.

This function stops Intel PT on the CPU where it is working, therefore
users of it need to call it for each CPU to stop all logging.

Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin<alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: H.Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Vivek Goyal <vgoyal@redhat.com>
Link: http://lkml.kernel.org/r/1446614553-6072-2-git-send-email-indou.takao@jp.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Takao Indoh 2015-11-04 14:22:32 +09:00 committed by Ingo Molnar
parent b16a5b52eb
commit 24cc12b176
2 changed files with 19 additions and 0 deletions
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10
arch/x86/include/asm/intel_pt.h Normal file
View file

@ -0,0 +1,10 @@
#ifndef _ASM_X86_INTEL_PT_H
#define _ASM_X86_INTEL_PT_H
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
void cpu_emergency_stop_pt(void);
#else
static inline void cpu_emergency_stop_pt(void) {}
#endif
#endif /* _ASM_X86_INTEL_PT_H */

9
arch/x86/kernel/cpu/perf_event_intel_pt.c
View file

@ -27,6 +27,7 @@
#include <asm/perf_event.h>
#include <asm/insn.h>
#include <asm/io.h>
#include <asm/intel_pt.h>
#include "perf_event.h"
#include "intel_pt.h"
@ -1122,6 +1123,14 @@ static int pt_event_init(struct perf_event *event)
return 0;
}
void cpu_emergency_stop_pt(void)
{
struct pt *pt = this_cpu_ptr(&pt_ctx);
if (pt->handle.event)
pt_event_stop(pt->handle.event, PERF_EF_UPDATE);
}
static __init int pt_init(void)
{
int ret, cpu, prior_warn = 0;