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Message-Id: <20240912151143.1264483-6-james.clark@linaro.org>
Date: Thu, 12 Sep 2024 16:11:36 +0100
From: James Clark <james.clark@...aro.org>
To: linux-perf-users@...r.kernel.org,
gankulkarni@...amperecomputing.com,
coresight@...ts.linaro.org,
leo.yan@....com,
scclevenger@...amperecomputing.com
Cc: James Clark <james.clark@...aro.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>,
John Garry <john.g.garry@...cle.com>,
Will Deacon <will@...nel.org>,
Leo Yan <leo.yan@...ux.dev>,
Ben Gainey <ben.gainey@....com>,
Ruidong Tian <tianruidong@...ux.alibaba.com>,
Benjamin Gray <bgray@...ux.ibm.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 5/7] perf scripts python cs-etm: Improve arguments
Make vmlinux detection automatic and use Perf's default objdump
when -d is specified. This will make it easier for a test to use the
script without having to provide arguments. And similarly for users.
Signed-off-by: James Clark <james.clark@...aro.org>
---
.../scripts/python/arm-cs-trace-disasm.py | 63 ++++++++++++++++---
1 file changed, 55 insertions(+), 8 deletions(-)
diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py
index 45f682a8b34d..02e957d037ea 100755
--- a/tools/perf/scripts/python/arm-cs-trace-disasm.py
+++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py
@@ -12,25 +12,48 @@ from os import path
import re
from subprocess import *
import argparse
+import platform
-from perf_trace_context import perf_set_itrace_options, \
- perf_sample_insn, perf_sample_srccode
+from perf_trace_context import perf_sample_srccode, perf_config_get
# Below are some example commands for using this script.
+# Note a --kcore recording is required for accurate decode
+# due to the alternatives patching mechanism. However this
+# script only supports reading vmlinux for disassembly dump,
+# meaning that any patched instructions will appear
+# as unpatched, but the instruction ranges themselves will
+# be correct. In addition to this, source line info comes
+# from Perf, and when using kcore there is no debug info. The
+# following lists the supported features in each mode:
+#
+# +-----------+-----------------+------------------+------------------+
+# | Recording | Accurate decode | Source line dump | Disassembly dump |
+# +-----------+-----------------+------------------+------------------+
+# | --kcore | yes | no | yes |
+# | normal | no | yes | yes |
+# +-----------+-----------------+------------------+------------------+
+#
+# Output disassembly with objdump and auto detect vmlinux
+# (when running on same machine.)
+# perf script -s scripts/python/arm-cs-trace-disasm.py -d
#
-# Output disassembly with objdump:
-# perf script -s scripts/python/arm-cs-trace-disasm.py \
-# -- -d objdump -k path/to/vmlinux
# Output disassembly with llvm-objdump:
# perf script -s scripts/python/arm-cs-trace-disasm.py \
# -- -d llvm-objdump-11 -k path/to/vmlinux
+#
# Output only source line and symbols:
# perf script -s scripts/python/arm-cs-trace-disasm.py
+def default_objdump():
+ config = perf_config_get("annotate.objdump")
+ return config if config else "objdump"
+
# Command line parsing.
args = argparse.ArgumentParser()
-args.add_argument("-k", "--vmlinux", help="Set path to vmlinux file")
-args.add_argument("-d", "--objdump", help="Set path to objdump executable file"),
+args.add_argument("-k", "--vmlinux",
+ help="Set path to vmlinux file. Omit to autodetect if running on same machine")
+args.add_argument("-d", "--objdump", nargs="?", const=default_objdump(),
+ help="Show disassembly. Can also be used to change the objdump path"),
args.add_argument("-v", "--verbose", action="store_true", help="Enable debugging log")
options = args.parse_args()
@@ -45,6 +68,17 @@ glb_source_file_name = None
glb_line_number = None
glb_dso = None
+kver = platform.release()
+vmlinux_paths = [
+ f"/usr/lib/debug/boot/vmlinux-{kver}.debug",
+ f"/usr/lib/debug/lib/modules/{kver}/vmlinux",
+ f"/lib/modules/{kver}/build/vmlinux",
+ f"/usr/lib/debug/boot/vmlinux-{kver}",
+ f"/boot/vmlinux-{kver}",
+ f"/boot/vmlinux",
+ f"vmlinux"
+]
+
def get_optional(perf_dict, field):
if field in perf_dict:
return perf_dict[field]
@@ -55,12 +89,25 @@ def get_offset(perf_dict, field):
return "+%#x" % perf_dict[field]
return ""
+def find_vmlinux():
+ if hasattr(find_vmlinux, "path"):
+ return find_vmlinux.path
+
+ for v in vmlinux_paths:
+ if os.access(v, os.R_OK):
+ find_vmlinux.path = v
+ break
+ else:
+ find_vmlinux.path = None
+
+ return find_vmlinux.path
+
def get_dso_file_path(dso_name, dso_build_id):
if (dso_name == "[kernel.kallsyms]" or dso_name == "vmlinux"):
if (options.vmlinux):
return options.vmlinux;
else:
- return dso_name
+ return find_vmlinux() if find_vmlinux() else dso_name
if (dso_name == "[vdso]") :
append = "/vdso"
--
2.34.1
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