linux-kernel - [PATCH 2/5] perf: arm_spe: Add new event packet bits

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Message-Id: <20200922101225.183554-3-andre.przywara@arm.com>
Date:   Tue, 22 Sep 2020 11:12:22 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Tan Xiaojun <tanxiaojun@...wei.com>,
        James Clark <james.clark@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] perf: arm_spe: Add new event packet bits

The ARMv8.3-SPE extension adds some new bits to the event packet
fields.

Handle bits 11 (alignment), 17 and 18 (SVE predication) when decoding
the SPE buffer content.

Signed-off-by: Andre Przywara <andre.przywara@....com>
---
 .../util/arm-spe-decoder/arm-spe-pkt-decoder.c  | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
index b94001b756c7..e633bb5b8e65 100644
--- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
+++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
@@ -346,6 +346,23 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
 				buf += ret;
 				blen -= ret;
 			}
+			if (payload & BIT(11)) {
+				ret = snprintf(buf, buf_len, " ALIGNMENT");
+				buf += ret;
+				blen -= ret;
+			}
+		}
+		if (idx > 2) {
+			if (payload & BIT(17)) {
+				ret = snprintf(buf, buf_len, " SVE-PARTIAL-PRED");
+				buf += ret;
+				blen -= ret;
+			}
+			if (payload & BIT(18)) {
+				ret = snprintf(buf, buf_len, " SVE-EMPTY-PRED");
+				buf += ret;
+				blen -= ret;
+			}
 		}
 		if (ret < 0)
 			return ret;
-- 
2.17.1