linux-kernel - [PATCH 1/2] perf, x86: Add basic Ivy Bridge support v2

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Date:	Fri,  8 Jun 2012 14:45:27 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	mingo@...e.hu
Cc:	eranian@...gle.com, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 1/2] perf, x86: Add basic Ivy Bridge support v2

From: Andi Kleen <ak@...ux.intel.com>

Very similar to Sandy Bridge, but there is no PEBS problem.

As Stephane pointed out .code=0xb1, .umask=0x01 is gone, so don't
do a generic backend stall event on IvyBridge.

v2: Remove stall event
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Conflicts:

	arch/x86/kernel/cpu/perf_event_intel.c
---
 arch/x86/kernel/cpu/perf_event_intel.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index e23e71f..4d6188d 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1767,6 +1767,7 @@ __init int intel_pmu_init(void)
 	union cpuid10_ebx ebx;
 	unsigned int unused;
 	int version;
+	char *name;
 
 	if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
 		switch (boot_cpu_data.x86) {
@@ -1910,10 +1911,21 @@ __init int intel_pmu_init(void)
 		pr_cont("Westmere events, ");
 		break;
 
+	case 58: /* IvyBridge */
+		name = "Ivy";
+		/* No backend stall event */
+		goto snb_ivb_common;
+
 	case 42: /* SandyBridge */
 	case 45: /* SandyBridge, "Romely-EP" */
 		x86_add_quirk(intel_sandybridge_quirk);
-	case 58: /* IvyBridge */
+		name = "Sandy";
+
+		/* 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);
+
+	snb_ivb_common:
 		memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
 		       sizeof(hw_cache_event_ids));
 
@@ -1934,7 +1946,7 @@ __init int intel_pmu_init(void)
 		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
 			X86_CONFIG(.event=0xb1, .umask=0x01, .inv=1, .cmask=1);
 
-		pr_cont("SandyBridge events, ");
+		pr_cont("%sBridge events, ", name);
 		break;
 
 	default:
-- 
1.7.7.6

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