linux-kernel - [PATCH v3 06/25] perf arm_spe: Decode SME data processing packet

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Message-Id: <20251112-perf_support_arm_spev1-3-v3-6-e63c9829f9d9@arm.com>
Date: Wed, 12 Nov 2025 18:24:32 +0000
From: Leo Yan <leo.yan@....com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
 James Clark <james.clark@...aro.org>, Mark Rutland <mark.rutland@....com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>, 
 linux-perf-users@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Leo Yan <leo.yan@....com>
Subject: [PATCH v3 06/25] perf arm_spe: Decode SME data processing packet

For SME data processing, decode its Effective vector length or Tile Size
(ETS), and print out if a floating-point operation.

After:

  .  00000000:  49 00                                           SME-OTHER ETS 1024 FP
  .  00000002:  b2 18 3c d7 83 00 80 ff ff                      VA 0xffff800083d73c18
  .  0000000b:  9a 00 00                                        LAT 0 XLAT
  .  0000000e:  43 00                                           DATA-SOURCE 0

Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c |  9 +++++++++
 tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h | 11 +++++++++++
 2 files changed, 20 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 21b65a9b40f481b6cb25aaf01ab627ade046ff72..5769ba2f414049161f271fd8b8f40c440d15a75a 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
@@ -351,6 +351,15 @@ static int arm_spe_pkt_desc_op_type(const struct arm_spe_pkt *packet,
 				arm_spe_pkt_out_string(&err, &buf, &buf_len, " FP");
 			if (payload & SPE_OP_PKT_SVE_PRED)
 				arm_spe_pkt_out_string(&err, &buf, &buf_len, " PRED");
+		} else if (SPE_OP_PKT_OTHER_SUBCLASS_SME(payload)) {
+			arm_spe_pkt_out_string(&err, &buf, &buf_len, "SME-OTHER");
+
+			/* SME effective vector length or tile size */
+			arm_spe_pkt_out_string(&err, &buf, &buf_len, " ETS %d",
+					       SPE_OP_PKG_SME_ETS(payload));
+
+			if (payload & SPE_OP_PKT_OTHER_FP)
+				arm_spe_pkt_out_string(&err, &buf, &buf_len, " FP");
 		} else if (SPE_OP_PKT_OTHER_SUBCLASS_OTHER(payload)) {
 			arm_spe_pkt_out_string(&err, &buf, &buf_len, "OTHER");
 			if (payload & SPE_OP_PKT_OTHER_ASE)
diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
index 704601c6dbe30e93f83a82670d0d60344a22222a..adf4cde320aad01265b5232b0d6ff6b1f752f35f 100644
--- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
+++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
@@ -125,10 +125,21 @@ enum arm_spe_events {
 
 #define SPE_OP_PKT_OTHER_SUBCLASS_OTHER(v)	(((v) & GENMASK_ULL(7, 3)) == 0x0)
 #define SPE_OP_PKT_OTHER_SUBCLASS_SVE(v)	(((v) & (BIT(7) | BIT(3) | BIT(0))) == 0x8)
+#define SPE_OP_PKT_OTHER_SUBCLASS_SME(v)	(((v) & (BIT(7) | BIT(3) | BIT(0))) == 0x88)
 
 #define SPE_OP_PKT_OTHER_ASE			BIT(2)
 #define SPE_OP_PKT_OTHER_FP			BIT(1)
 
+/*
+ * SME effective vector length or tile size (ETS) is stored in byte 0
+ * bits [6:4,2]; the length is rounded up to a power of two and use 128
+ * as one step, so ETS calculation is:
+ *
+ *   128 * (2 ^ bits [6:4,2]) = 32 << (bits [6:4,2])
+ */
+#define SPE_OP_PKG_SME_ETS(v)			(128 << (FIELD_GET(GENMASK_ULL(6, 4), (v)) << 1 | \
+							(FIELD_GET(BIT(2), (v)))))
+
 #define SPE_OP_PKT_LDST_SUBCLASS_GP_REG(v)	(((v) & GENMASK_ULL(7, 1)) == 0x0)
 #define SPE_OP_PKT_LDST_SUBCLASS_SIMD_FP(v)	(((v) & GENMASK_ULL(7, 1)) == 0x4)
 #define SPE_OP_PKT_LDST_SUBCLASS_UNSPEC_REG(v)	(((v) & GENMASK_ULL(7, 1)) == 0x10)

-- 
2.34.1