linux-kernel - [PATCH v3 25/25] perf arm_spe: Improve SIMD flags setting

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Message-Id: <20251112-perf_support_arm_spev1-3-v3-25-e63c9829f9d9@arm.com>
Date: Wed, 12 Nov 2025 18:24:51 +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 25/25] perf arm_spe: Improve SIMD flags setting

Fill in ASE and SME operations for the SIMD arch field.

Also set the predicate flags for SVE and SME, but differences between
them: SME does not have a predicate flag, so the setting is based on
events. SVE provides a predicate flag to indicate whether the predicate
is disabled, which allows it to be distinguished into four cases: full
predicates, empty predicates, fully predicated, and disabled predicates.

After:

    perf report -s +simd
    ...
    0.06%     0.06%  sve-test  sve-test               [.] setz                                        [p] SVE
    0.06%     0.06%  sve-test  [kernel.kallsyms]      [k] do_raw_spin_lock
    0.06%     0.06%  sve-test  sve-test               [.] getz                                        [p] SVE
    0.06%     0.06%  sve-test  [kernel.kallsyms]      [k] timekeeping_advance
    0.06%     0.06%  sve-test  sve-test               [.] getz                                        [d] SVE
    0.06%     0.06%  sve-test  [kernel.kallsyms]      [k] update_load_avg
    0.06%     0.06%  sve-test  sve-test               [.] getz                                        [e] SVE
    0.05%     0.05%  sve-test  sve-test               [.] setz                                        [e] SVE
    0.05%     0.05%  sve-test  [kernel.kallsyms]      [k] update_curr
    0.05%     0.05%  sve-test  sve-test               [.] setz                                        [d] SVE
    0.05%     0.05%  sve-test  [kernel.kallsyms]      [k] do_raw_spin_unlock
    0.05%     0.05%  sve-test  [kernel.kallsyms]      [k] timekeeping_update_from_shadow.constprop.0
    0.05%     0.05%  sve-test  sve-test               [.] getz                                        [f] SVE
    0.05%     0.05%  sve-test  sve-test               [.] setz                                        [f] SVE

Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/perf/util/arm-spe.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
index 3b2d767f7a3e156594a69e7b546f3156cceb4951..6b76a6e9457adc650b7b790b4ab38cfe9eca5e22 100644
--- a/tools/perf/util/arm-spe.c
+++ b/tools/perf/util/arm-spe.c
@@ -353,12 +353,26 @@ static struct simd_flags arm_spe__synth_simd_flags(const struct arm_spe_record *
 
 	if (record->op & ARM_SPE_OP_SVE)
 		simd_flags.arch |= SIMD_OP_FLAGS_ARCH_SVE;
-
-	if (record->type & ARM_SPE_SVE_PARTIAL_PRED)
-		simd_flags.pred |= SIMD_OP_FLAGS_PRED_PARTIAL;
-
-	if (record->type & ARM_SPE_SVE_EMPTY_PRED)
-		simd_flags.pred |= SIMD_OP_FLAGS_PRED_EMPTY;
+	else if (record->op & ARM_SPE_OP_SME)
+		simd_flags.arch |= SIMD_OP_FLAGS_ARCH_SME;
+	else if (record->op & (ARM_SPE_OP_ASE | ARM_SPE_OP_SIMD_FP))
+		simd_flags.arch |= SIMD_OP_FLAGS_ARCH_ASE;
+
+	if (record->op & ARM_SPE_OP_SVE) {
+		if (!(record->op & ARM_SPE_OP_PRED))
+			simd_flags.pred = SIMD_OP_FLAGS_PRED_DISABLED;
+		else if (record->type & ARM_SPE_SVE_PARTIAL_PRED)
+			simd_flags.pred = SIMD_OP_FLAGS_PRED_PARTIAL;
+		else if (record->type & ARM_SPE_SVE_EMPTY_PRED)
+			simd_flags.pred = SIMD_OP_FLAGS_PRED_EMPTY;
+		else
+			simd_flags.pred = SIMD_OP_FLAGS_PRED_FULL;
+	} else {
+		if (record->type & ARM_SPE_SVE_PARTIAL_PRED)
+			simd_flags.pred = SIMD_OP_FLAGS_PRED_PARTIAL;
+		else if (record->type & ARM_SPE_SVE_EMPTY_PRED)
+			simd_flags.pred = SIMD_OP_FLAGS_PRED_EMPTY;
+	}
 
 	return simd_flags;
 }

-- 
2.34.1