linux-kernel - [PATCH 2/6] perf, x86: Add Haswell specific transaction flag reporting v4

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Message-Id: <1379095716-4705-3-git-send-email-andi@firstfloor.org>
Date:	Fri, 13 Sep 2013 11:08:32 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	mingo@...nel.org
Cc:	peterz@...radead.org, acme@...radead.org,
	linux-kernel@...r.kernel.org, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 2/6] perf, x86: Add Haswell specific transaction flag reporting v4

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

In the PEBS handler report the transaction flags using the new
generic transaction flags facility. Most of them come from
the "tsx_tuning" field in PEBSv2, but the abort code is derived
from the RAX register reported in the PEBS record.

v2: Fix interaction with precise-loads
v3: Mask out reserved bits. More comments.
v4: Adjust white space
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/cpu/perf_event_intel_ds.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 104cbba..f798be8 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -207,6 +207,8 @@ union hsw_tsx_tuning {
 	u64	    value;
 };
 
+#define PEBS_HSW_TSX_FLAGS	0xff00000000
+
 void init_debug_store_on_cpu(int cpu)
 {
 	struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
@@ -893,6 +895,16 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
 	    (x86_pmu.intel_cap.pebs_format >= 2))
 		data.weight = intel_hsw_weight(pebs);
 
+	if ((event->attr.sample_type & PERF_SAMPLE_TRANSACTION) &&
+	    x86_pmu.intel_cap.pebs_format >= 2) {
+		data.transaction =
+			(pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32;
+		/* For RTM XABORTs also log the abort code from AX */
+		if ((data.transaction & PERF_SAMPLE_TXN_TRANSACTION) &&
+		    (pebs->ax & 1))
+			data.transaction |= pebs->ax & 0xff000000;
+	}
+
 	if (has_branch_stack(event))
 		data.br_stack = &cpuc->lbr_stack;
 
-- 
1.8.3.1

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