[PATCH] perf x86: Change SandyBridge and IvyBrige instructions event to be precise

[Jiri Olsa]

Changing the default 'instructions' HW event for SandyBridge and
IvyBrige to use the available precise 'instructions' event.

The precise event is defined in Intel SDM as:

INST_RETIRED.ALL - Precise instruction retired event with HW to
reduce effect of PEBS shadow in IP distribution

for both SandyBridge and IvyBrige micro-archs. It allows to use
precise modifier on 'instructions' event on SandyBridge and
IvyBrige micro-archs which is not possible now.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
---
 arch/x86/kernel/cpu/perf_event_intel.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 529c893..3bc3592 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2104,6 +2104,9 @@ __init int intel_pmu_init(void)
 		/* UOPS_DISPATCHED.THREAD,c=1,i=1 to count stall cycles*/
 		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
 			X86_CONFIG(.event=0xb1, .umask=0x01, .inv=1, .cmask=1);
+		/* INST_RETIRED.ALL to count precise instructions */
+		intel_perfmon_event_map[PERF_COUNT_HW_INSTRUCTIONS] =
+			X86_CONFIG(.event=0xc0, .umask=0x01);
 
 		pr_cont("SandyBridge events, ");
 		break;
@@ -2127,6 +2130,9 @@ __init int intel_pmu_init(void)
 		/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
 		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
 			X86_CONFIG(.event=0x0e, .umask=0x01, .inv=1, .cmask=1);
+		/* INST_RETIRED.ALL to count precise instructions */
+		intel_perfmon_event_map[PERF_COUNT_HW_INSTRUCTIONS] =
+			X86_CONFIG(.event=0xc0, .umask=0x01);
 
 		pr_cont("IvyBridge events, ");
 		break;
-- 
1.7.11.7

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