Re: [PATCH v3 18/25] perf/uapi: Extend data source fields
From: Leo Yan <leo.yan@arm.com>
Date: 2025-11-18 17:05:47
Also in:
linux-perf-users, lkml
On Wed, Nov 12, 2025 at 06:24:44PM +0000, Leo Yan wrote:
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>
Just ping perf core maintainers, is this uAPI change okay for you? Thanks for Ian's and James' review! Leo
quoted hunk ↗ jump to hunk
--- 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