[PATCH v4 1/8] perf/uapi: Extend data source fields
From: Leo Yan <leo.yan@arm.com>
Date: 2026-01-06 11:57:19
Also in:
linux-perf-users, lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
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@arm.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 c44a8fb3e4181c91a1e6e3a40e23fcf1de421af3..3d2c5ee9282efc4a2310f554443082f1d0027889 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h@@ -1330,14 +1330,32 @@ 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 */
@@ -1447,6 +1465,16 @@ 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