linux-kernel - [PATCH 5/5] perf: arm

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Date:   Tue, 22 Sep 2020 11:12:25 +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 5/5] perf: arm_spe: Decode SVE events

The Scalable Vector Extension (SVE) is an ARMv8 architecture extension
that introduces very long vector operations (up to 2048 bits).
The SPE profiling feature can tag SVE instructions with additional
properties like predication or the effective vector length.

Decode the new operation type bits in the SPE decoder to allow the perf
tool to correctly report about SVE instructions.

Signed-off-by: Andre Przywara <andre.przywara@....com>
---
 .../arm-spe-decoder/arm-spe-pkt-decoder.c     | 48 ++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

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 a033f34846a6..f0c369259554 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
@@ -372,8 +372,35 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
 	}
 	case ARM_SPE_OP_TYPE:
 		switch (idx) {
-		case 0:	return snprintf(buf, buf_len, "%s", payload & 0x1 ?
+		case 0: {
+			size_t blen = buf_len;
+
+			if ((payload & 0x89) == 0x08) {
+				ret = snprintf(buf, buf_len, "SVE");
+				buf += ret;
+				blen -= ret;
+				if (payload & 0x2)
+					ret = snprintf(buf, buf_len, " FP");
+				else
+					ret = snprintf(buf, buf_len, " INT");
+				buf += ret;
+				blen -= ret;
+				if (payload & 0x4) {
+					ret = snprintf(buf, buf_len, " PRED");
+					buf += ret;
+					blen -= ret;
+				}
+				/* Bits [7..4] encode the vector length */
+				ret = snprintf(buf, buf_len, " EVLEN%d",
+					       32 << ((payload >> 4) & 0x7));
+				buf += ret;
+				blen -= ret;
+				return buf_len - blen;
+			}
+
+			return snprintf(buf, buf_len, "%s", payload & 0x1 ?
 					"COND-SELECT" : "INSN-OTHER");
+			}
 		case 1:	{
 			size_t blen = buf_len;
 
@@ -403,6 +430,25 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
 				ret = snprintf(buf, buf_len, " NV-SYSREG");
 				buf += ret;
 				blen -= ret;
+			} else if ((payload & 0x0a) == 0x08) {
+				ret = snprintf(buf, buf_len, " SVE");
+				buf += ret;
+				blen -= ret;
+				if (payload & 0x4) {
+					ret = snprintf(buf, buf_len, " PRED");
+					buf += ret;
+					blen -= ret;
+				}
+				if (payload & 0x80) {
+					ret = snprintf(buf, buf_len, " SG");
+					buf += ret;
+					blen -= ret;
+				}
+				/* Bits [7..4] encode the vector length */
+				ret = snprintf(buf, buf_len, " EVLEN%d",
+					       32 << ((payload >> 4) & 0x7));
+				buf += ret;
+				blen -= ret;
 			} else if (payload & 0x4) {
 				ret = snprintf(buf, buf_len, " SIMD-FP");
 				buf += ret;
-- 
2.17.1