linux-kernel - [PATCH 2/6] perf, x86: Add Haswell specific transaction flag reporting v5

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Date:	Fri, 20 Sep 2013 07:40:40 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...radead.org, mingo@...nel.org, peterz@...radead.org,
	eranian@...gle.com, jolsa@...hat.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 2/6] perf, x86: Add Haswell specific transaction flag reporting v5

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
v5: Refactor PEBS handler code to collapse one if
    and move parts into new inline.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/cpu/perf_event_intel_ds.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 104cbba..fd2dbac 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	0xff00000000ULL
+
 void init_debug_store_on_cpu(int cpu)
 {
 	struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
@@ -807,6 +809,16 @@ static inline u64 intel_hsw_weight(struct pebs_record_hsw *pebs)
 	return 0;
 }
 
+static inline u64 intel_hsw_transaction(struct pebs_record_hsw *pebs)
+{
+	u64 txn = (pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32;
+
+	/* For RTM XABORTs also log the abort code from AX */
+	if ((txn & PERF_TXN_TRANSACTION) && (pebs->ax & 1))
+		txn |= ((pebs->ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT;
+	return txn;
+}
+
 static void __intel_pmu_pebs_event(struct perf_event *event,
 				   struct pt_regs *iregs, void *__pebs)
 {
@@ -887,11 +899,14 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
 		x86_pmu.intel_cap.pebs_format >= 1)
 		data.addr = pebs->dla;
 
-	/* Only set the TSX weight when no memory weight was requested. */
-	if ((event->attr.sample_type & PERF_SAMPLE_WEIGHT) &&
-	    !fll &&
-	    (x86_pmu.intel_cap.pebs_format >= 2))
-		data.weight = intel_hsw_weight(pebs);
+	if (x86_pmu.intel_cap.pebs_format >= 2) {
+		/* Only set the TSX weight when no memory weight. */
+		if ((event->attr.sample_type & PERF_SAMPLE_WEIGHT) && !fll)
+			data.weight = intel_hsw_weight(pebs);
+
+		if (event->attr.sample_type & PERF_SAMPLE_TRANSACTION)
+			data.txn = intel_hsw_transaction(pebs);
+	}
 
 	if (has_branch_stack(event))
 		data.br_stack = &cpuc->lbr_stack;
-- 
1.8.3.1

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