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#!/usr/bin/env python3
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
import json
hw_cache_id = [
(0, # PERF_COUNT_HW_CACHE_L1D
["L1-dcache", "l1-d", "l1d", "L1-data",],
[0, 1, 2,], # read, write, prefetch
"Level 1 data cache",
),
(1, # PERF_COUNT_HW_CACHE_L1I
["L1-icache", "l1-i", "l1i", "L1-instruction",],
[0, 2,], # read, prefetch
"Level 1 instruction cache",
),
(2, # PERF_COUNT_HW_CACHE_LL
["LLC", "L2"],
[0, 1, 2,], # read, write, prefetch
"Last level cache",
),
(3, # PERF_COUNT_HW_CACHE_DTLB
["dTLB", "d-tlb", "Data-TLB",],
[0, 1, 2,], # read, write, prefetch
"Data TLB",
),
(4, # PERF_COUNT_HW_CACHE_ITLB
["iTLB", "i-tlb", "Instruction-TLB",],
[0,], # read
"Instruction TLB",
),
(5, # PERF_COUNT_HW_CACHE_BPU
["branch", "branches", "bpu", "btb", "bpc",],
[0,], # read
"Branch prediction unit",
),
(6, # PERF_COUNT_HW_CACHE_NODE
["node",],
[0, 1, 2,], # read, write, prefetch
"Local memory",
),
]
hw_cache_op = [
(0, # PERF_COUNT_HW_CACHE_OP_READ
["load", "loads", "read",],
"read"),
(1, # PERF_COUNT_HW_CACHE_OP_WRITE
["store", "stores", "write",],
"write"),
(2, # PERF_COUNT_HW_CACHE_OP_PREFETCH
["prefetch", "prefetches", "speculative-read", "speculative-load",],
"prefetch"),
]
hw_cache_result = [
(0, # PERF_COUNT_HW_CACHE_RESULT_ACCESS
["refs", "Reference", "ops", "access",],
"accesses"),
(1, # PERF_COUNT_HW_CACHE_RESULT_MISS
["misses", "miss",],
"misses"),
]
events: list[dict[str, str]] = []
def add_event(name: str,
cache_id: int, cache_op: int, cache_result: int,
desc: str,
deprecated: bool) -> None:
# Avoid conflicts with PERF_TYPE_HARDWARE events which are higher priority.
if name in ["branch-misses", "branches"]:
return
# Tweak and deprecate L2 named events.
if name.startswith("L2"):
desc = desc.replace("Last level cache", "Level 2 (or higher) last level cache")
deprecated = True
event = {
"EventName": name,
"BriefDescription": desc,
"LegacyCacheCode": f"0x{cache_id | (cache_op << 8) | (cache_result << 16):06x}",
}
# Deprecate events with the name starting L2 as it is actively
# confusing as on many machines it actually means the L3 cache.
if deprecated:
event["Deprecated"] = "1"
events.append(event)
for (cid, names, ops, cache_desc) in hw_cache_id:
for cname in names:
add_event(cname,
cid,
0, # PERF_COUNT_HW_CACHE_OP_READ
0, # PERF_COUNT_HW_CACHE_RESULT_ACCESS
f"{cache_desc} read accesses.",
deprecated=True)
for (op, op_names, op_desc) in hw_cache_op:
if op not in ops:
continue
for op_name in op_names:
is_deprecated = (names[0] != cname or op_names[1] != op_name)
add_event(f"{cname}-{op_name}",
cid,
op,
0, # PERF_COUNT_HW_CACHE_RESULT_ACCESS
f"{cache_desc} {op_desc} accesses.",
is_deprecated)
for (result, result_names, result_desc) in hw_cache_result:
for result_name in result_names:
is_deprecated = ((names[0] != cname or op_names[0] != op_name) or
(result == 0) or (result_names[0] != result_name))
add_event(f"{cname}-{op_name}-{result_name}",
cid,
op,
result,
f"{cache_desc} {op_desc} {result_desc}.",
is_deprecated)
for (result, result_names, result_desc) in hw_cache_result:
for result_name in result_names:
add_event(f"{cname}-{result_name}",
cid,
0, # PERF_COUNT_HW_CACHE_OP_READ
result,
f"{cache_desc} read {result_desc}.",
deprecated=True)
print(json.dumps(events, indent=2))
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