linux-kernel - [PATCH v3 18/25] perf/uapi: Extend data source fields

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Message-Id: <20251112-perf_support_arm_spev1-3-v3-18-e63c9829f9d9@arm.com>
Date: Wed, 12 Nov 2025 18:24:44 +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 18/25] perf/uapi: Extend data source fields

Arm CPUs introduce several new types of memory operations, like MTE tag
accessing, system register access for nested virtualization, memcpy &
memset, and Guarded Control Stack (GCS).

For memory operation details, Arm SPE provides information like data
(parallel) processing, floating-point, predicated, atomic, exclusive,
acquire/release, gather/scatter, and conditional.

This commit introduces a field 'mem_op_ext' for extended operation type.
The extended operation type can be combined with the existed operation
type to express a memory type, for examples, a PERF_MEM_OP_GCS type can
be set along with PERF_MEM_OP_LOAD to present a load operation for
GCS register access.

Bit fields are also added to represent detailed operation attributes.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 include/uapi/linux/perf_event.h | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 78a362b8002776e5ce83a0d7816601638c61ecc6..9b9fa59fd828756b5e8e93520da5a269f0dfff52 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -1309,14 +1309,32 @@ union perf_mem_data_src {
 			mem_snoopx  :  2, /* Snoop mode, ext */
 			mem_blk     :  3, /* Access blocked */
 			mem_hops    :  3, /* Hop level */
-			mem_rsvd    : 18;
+			mem_op_ext  :  4, /* Extended type of opcode */
+			mem_dp      :  1, /* Data processing */
+			mem_fp      :  1, /* Floating-point */
+			mem_pred    :  1, /* Predicated */
+			mem_atomic  :  1, /* Atomic operation */
+			mem_excl    :  1, /* Exclusive */
+			mem_ar      :  1, /* Acquire/release */
+			mem_sg      :  1, /* Scatter/Gather */
+			mem_cond    :  1, /* Conditional */
+			mem_rsvd    :  6;
 	};
 };
 #elif defined(__BIG_ENDIAN_BITFIELD)
 union perf_mem_data_src {
 	__u64 val;
 	struct {
-		__u64	mem_rsvd    : 18,
+		__u64	mem_rsvd    :  6,
+			mem_cond    :  1, /* Conditional */
+			mem_sg      :  1, /* Scatter/Gather */
+			mem_ar      :  1, /* Acquire/release */
+			mem_excl    :  1, /* Exclusive */
+			mem_atomic  :  1, /* Atomic operation */
+			mem_pred    :  1, /* Predicated */
+			mem_fp      :  1, /* Floating-point */
+			mem_dp      :  1, /* Data processing */
+			mem_op_ext  :  4, /* Extended type of opcode */
 			mem_hops    :  3, /* Hop level */
 			mem_blk     :  3, /* Access blocked */
 			mem_snoopx  :  2, /* Snoop mode, ext */
@@ -1426,6 +1444,16 @@ union perf_mem_data_src {
 /* 5-7 available */
 #define PERF_MEM_HOPS_SHIFT			43
 
+/* Extended type of memory opcode: */
+#define PERF_MEM_EXT_OP_NA			0x0    /* Not available */
+#define PERF_MEM_EXT_OP_MTE_TAG			0x1    /* MTE tag */
+#define PERF_MEM_EXT_OP_NESTED_VIRT		0x2    /* Nested virtualization */
+#define PERF_MEM_EXT_OP_MEMCPY			0x3    /* Memory copy */
+#define PERF_MEM_EXT_OP_MEMSET			0x4    /* Memory set */
+#define PERF_MEM_EXT_OP_SIMD			0x5    /* SIMD */
+#define PERF_MEM_EXT_OP_GCS			0x6    /* Guarded Control Stack */
+#define PERF_MEM_EXT_OP_SHIFT			46
+
 #define PERF_MEM_S(a, s) \
 	(((__u64)PERF_MEM_##a##_##s) << PERF_MEM_##a##_SHIFT)
 

-- 
2.34.1