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Subject[PATCH 04/12] perf test: Add beginning of test infra + test to exercise coresight
Date
From: Carsten Haitzler <carsten.haitzler@arm.com>

This adds the initial test harness to run perf record and examine the
resuling output when coresight is enabled on arm64 and check the
resulting quality of the output as part of perf test.

Signed-off-by: Carsten Haitzler <carsten.haitzler@arm.com>
---
MAINTAINERS | 3 +
tools/perf/Makefile.perf | 14 +-
.../tests/shell/coresight_asm_pure_loop.sh | 18 +++
tools/perf/tests/shell/lib/coresight.sh | 130 ++++++++++++++++++
tools/perf/tests/shell/tools/Makefile | 26 ++++
.../perf/tests/shell/tools/coresight/Makefile | 27 ++++
.../shell/tools/coresight/Makefile.miniconfig | 23 ++++
.../tools/coresight/asm_pure_loop/Makefile | 30 ++++
.../coresight/asm_pure_loop/asm_pure_loop.S | 28 ++++
9 files changed, 297 insertions(+), 2 deletions(-)
create mode 100755 tools/perf/tests/shell/coresight_asm_pure_loop.sh
create mode 100644 tools/perf/tests/shell/lib/coresight.sh
create mode 100644 tools/perf/tests/shell/tools/Makefile
create mode 100644 tools/perf/tests/shell/tools/coresight/Makefile
create mode 100644 tools/perf/tests/shell/tools/coresight/Makefile.miniconfig
create mode 100644 tools/perf/tests/shell/tools/coresight/asm_pure_loop/Makefile
create mode 100644 tools/perf/tests/shell/tools/coresight/asm_pure_loop/asm_pure_loop.S

diff --git a/MAINTAINERS b/MAINTAINERS
index 13f9a84a617e..d46e8469c467 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1894,6 +1894,9 @@ F: tools/perf/arch/arm/util/auxtrace.c
F: tools/perf/arch/arm/util/cs-etm.c
F: tools/perf/arch/arm/util/cs-etm.h
F: tools/perf/arch/arm/util/pmu.c
+F: tools/perf/tests/shell/coresight_*
+F: tools/perf/tests/shell/tools/Makefile
+F: tools/perf/tests/shell/tools/coresight/*
F: tools/perf/util/cs-etm-decoder/*
F: tools/perf/util/cs-etm.*

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 80522bcfafe0..26467a2c71f4 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -630,7 +630,15 @@ sync_file_range_tbls := $(srctree)/tools/perf/trace/beauty/sync_file_range.sh
$(sync_file_range_arrays): $(linux_uapi_dir)/fs.h $(sync_file_range_tbls)
$(Q)$(SHELL) '$(sync_file_range_tbls)' $(linux_uapi_dir) > $@

-all: shell_compatibility_test $(ALL_PROGRAMS) $(LANG_BINDINGS) $(OTHER_PROGRAMS)
+TESTS_TOOLS_DIR := $(srctree)/tools/perf/tests/shell/tools
+
+tests-tools-targets: FORCE
+ $(Q)$(MAKE) -C $(TESTS_TOOLS_DIR)
+
+tests-tools-targets-clean:
+ $(Q)$(MAKE) -C $(TESTS_TOOLS_DIR) clean
+
+all: shell_compatibility_test $(ALL_PROGRAMS) $(LANG_BINDINGS) $(OTHER_PROGRAMS) tests-tools-targets

# Create python binding output directory if not already present
_dummy := $(shell [ -d '$(OUTPUT)python' ] || mkdir -p '$(OUTPUT)python')
@@ -1020,6 +1028,7 @@ install-tests: all install-gtk
$(INSTALL) tests/shell/*.sh '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell'; \
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/lib'; \
$(INSTALL) tests/shell/lib/*.sh '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/lib'
+ $(Q)$(MAKE) -C tests/shell/tools install-tests

install-bin: install-tools install-tests install-traceevent-plugins

@@ -1088,7 +1097,7 @@ endif # BUILD_BPF_SKEL
bpf-skel-clean:
$(call QUIET_CLEAN, bpf-skel) $(RM) -r $(SKEL_TMP_OUT) $(SKELETONS)

-clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean $(LIBPERF)-clean fixdep-clean python-clean bpf-skel-clean
+clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean $(LIBPERF)-clean fixdep-clean python-clean bpf-skel-clean tests-tools-targets-clean
$(call QUIET_CLEAN, core-objs) $(RM) $(LIBPERF_A) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(OUTPUT)perf-iostat $(LANG_BINDINGS)
$(Q)find $(if $(OUTPUT),$(OUTPUT),.) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
$(Q)$(RM) $(OUTPUT).config-detected
@@ -1155,5 +1164,6 @@ FORCE:
.PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell
.PHONY: $(GIT-HEAD-PHONY) TAGS tags cscope FORCE prepare
.PHONY: libtraceevent_plugins archheaders
+.PHONY: $(TESTS_TOOLS_TARGETS)

endif # force_fixdep
diff --git a/tools/perf/tests/shell/coresight_asm_pure_loop.sh b/tools/perf/tests/shell/coresight_asm_pure_loop.sh
new file mode 100755
index 000000000000..542d4a37e349
--- /dev/null
+++ b/tools/perf/tests/shell/coresight_asm_pure_loop.sh
@@ -0,0 +1,18 @@
+#!/bin/sh -e
+# Coresight / ASM Pure Loop
+
+# SPDX-License-Identifier: GPL-2.0
+# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
+
+TEST="asm_pure_loop"
+. $(dirname $0)/lib/coresight.sh
+ARGS=""
+DATV="out"
+DATA="$DATD/perf-$TEST-$DATV.data"
+
+perf record $PERFRECOPT -o "$DATA" "$BIN" $ARGS
+
+perf_dump_aux_verify "$DATA" 2601 334 334
+
+err=$?
+exit $err
diff --git a/tools/perf/tests/shell/lib/coresight.sh b/tools/perf/tests/shell/lib/coresight.sh
new file mode 100644
index 000000000000..cd6c1283e6f5
--- /dev/null
+++ b/tools/perf/tests/shell/lib/coresight.sh
@@ -0,0 +1,130 @@
+# SPDX-License-Identifier: GPL-2.0
+# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
+
+# This is sourced from a driver script so no need for #!/bin... etc. at the
+# top - the assumption below is that it runs as part of sourcing after the
+# test sets up some basic env vars to say what it is.
+
+# perf record options for the perf tests to use
+PERFRECMEM="-m ,128M"
+PERFRECOPT="$PERFRECMEM -e cs_etm//u"
+
+# These tests need to be run as root or coresight won't allow large buffers
+# and will not collect proper data
+UID=`id -u`
+if test "$UID" -ne 0; then
+ echo "Not running as root... skip"
+ exit 2
+fi
+
+TOOLS=$(dirname $0)/tools
+DIR="$TOOLS/coresight/$TEST"
+BIN="$DIR/$TEST"
+# If the test tool/binary does not exist and is executable then skip the test
+if ! test -x "$BIN"; then exit 2; fi
+DATD="."
+# If the data dir env is set then make the data dir use that instead of ./
+if test -n "$PERF_TEST_CORESIGHT_DATADIR"; then
+ DATD="$PERF_TEST_CORESIGHT_DATADIR";
+fi
+# If the stat dir env is set then make the data dir use that instead of ./
+STATD="."
+if test -n "$PERF_TEST_CORESIGHT_STATDIR"; then
+ STATD="$PERF_TEST_CORESIGHT_STATDIR";
+fi
+
+# Called if the test fails - error code 2
+err() {
+ echo "$1"
+ exit 1
+}
+
+# Check that some statistics from our perf
+check_val_min() {
+ STATF="$4"
+ if test "$2" -lt "$3"; then
+ echo ", FAILED" >> "$STATF"
+ err "Sanity check number of $1 is too low ($2 < $3)"
+ fi
+}
+
+perf_dump_aux_verify() {
+ # Some basic checking that the AUX chunk contains some sensible data
+ # to see that we are recording something and at least a minimum
+ # amount of it. We should almost always see F3 atoms in just about
+ # anything but certainly we will see some trace info and async atom
+ # chunks.
+ DUMP="$DATD/perf-tmp-aux-dump.txt"
+ perf report --stdio --dump -i "$1" | \
+ grep -o -e I_ATOM_F3 -e I_ASYNC -e I_TRACE_INFO > "$DUMP"
+ # Simply count how many of these atoms we find to see that we are
+ # producing a reasonable amount of data - exact checks are not sane
+ # as this is a lossy process where we may lose some blocks and the
+ # compiler may produce different code depending on the compiler and
+ # optimization options, so this is rough just to see if we're
+ # either missing almost all the data or all of it
+ ATOM_F3_NUM=`grep I_ATOM_F3 "$DUMP" | wc -l`
+ ATOM_ASYNC_NUM=`grep I_ASYNC "$DUMP" | wc -l`
+ ATOM_TRACE_INFO_NUM=`grep I_TRACE_INFO "$DUMP" | wc -l`
+ rm -f "$DUMP"
+
+ # Arguments provide minimums for a pass
+ CHECK_F3_MIN="$2"
+ CHECK_ASYNC_MIN="$3"
+ CHECK_TRACE_INFO_MIN="$4"
+
+ # Write out statistics, so over time you can track results to see if
+ # there is a pattern - for example we have less "noisy" results that
+ # produce more consistent amounts of data each run, to see if over
+ # time any techinques to minimize data loss are having an effect or
+ # not
+ STATF="$STATD/stats-$TEST-$DATV.csv"
+ if ! test -f "$STATF"; then
+ echo "ATOM F3 Count, Minimum, ATOM ASYNC Count, Minimum, TRACE INFO Count, Minimum" > "$STATF"
+ fi
+ echo -n "$ATOM_F3_NUM, $CHECK_F3_MIN, $ATOM_ASYNC_NUM, $CHECK_ASYNC_MIN, $ATOM_TRACE_INFO_NUM, $CHECK_TRACE_INFO_MIN" >> "$STATF"
+
+ # Actually check to see if we passed or failed.
+ check_val_min "ATOM_F3" "$ATOM_F3_NUM" "$CHECK_F3_MIN" "$STATF"
+ check_val_min "ASYNC" "$ATOM_ASYNC_NUM" "$CHECK_ASYNC_MIN" "$STATF"
+ check_val_min "TRACE_INFO" "$ATOM_TRACE_INFO_NUM" "$CHECK_TRACE_INFO_MIN" "$STATF"
+ echo ", Ok" >> "$STATF"
+}
+
+perf_dump_aux_tid_verify() {
+ # Specifically crafted test will produce a list of Tread ID's to
+ # stdout that need to be checked to see that they have had trace
+ # info collected in AUX blocks in the perf data. This will go
+ # through all the TID's that are listed as CID=0xabcdef and see
+ # that all the Thread IDs the test tool reports are in the perf
+ # data AUX chunks
+
+ # The TID test tools will print a TID per stdout line that are being
+ # tested
+ TIDS=`cat "$2"`
+ # Scan the perf report to find the TIDs that are actually CID in hex
+ # and build a list of the ones found
+ FOUND_TIDS=`perf report --stdio --dump -i "$1" | \
+ grep -o "CID=0x[0-9a-z]\+" | sed 's/CID=//g' | \
+ uniq | sort | uniq`
+
+ # Iterate over the list of TIDs that the test says it has and find
+ # them in the TIDs found in the perf report
+ MISSING=""
+ for TID2 in $TIDS; do
+ FOUND=""
+ for TIDHEX in $FOUND_TIDS; do
+ TID=`printf "%i" $TIDHEX`
+ if test "$TID" -eq "$TID2"; then
+ FOUND="y"
+ break
+ fi
+ done
+ if test -z "$FOUND"; then
+ MISSING="$MISSING $TID"
+ fi
+ done
+ if test -n "$MISSING"; then
+ err "Thread IDs $MISSING not found in perf AUX data"
+ fi
+}
diff --git a/tools/perf/tests/shell/tools/Makefile b/tools/perf/tests/shell/tools/Makefile
new file mode 100644
index 000000000000..c7ada20922fd
--- /dev/null
+++ b/tools/perf/tests/shell/tools/Makefile
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
+include ../../../../../tools/scripts/Makefile.include
+include ../../../../../tools/scripts/Makefile.arch
+include ../../../../../tools/scripts/utilities.mak
+
+SUBDIRS = \
+ coresight
+
+all: $(SUBDIRS)
+$(SUBDIRS):
+ $(Q)$(MAKE) -C $@
+
+INSTALLDIRS = $(SUBDIRS:%=install-%)
+
+install-tests: all $(INSTALLDIRS)
+$(INSTALLDIRS):
+ $(Q)$(MAKE) -C $(@:install-%=%) install-tests
+
+CLEANDIRS = $(SUBDIRS:%=clean-%)
+
+clean: $(CLEANDIRS)
+$(CLEANDIRS):
+ $(Q)$(MAKE) -C $(@:clean-%=%) O=$(OUTPUT) clean >/dev/null
+
+.PHONY: all clean install-tests $(SUBDIRS) $(CLEANDIRS) $(INSTALLDIRS)
diff --git a/tools/perf/tests/shell/tools/coresight/Makefile b/tools/perf/tests/shell/tools/coresight/Makefile
new file mode 100644
index 000000000000..723006ea827c
--- /dev/null
+++ b/tools/perf/tests/shell/tools/coresight/Makefile
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
+include ../../../../../../tools/scripts/Makefile.include
+include ../../../../../../tools/scripts/Makefile.arch
+include ../../../../../../tools/scripts/utilities.mak
+
+SUBDIRS = \
+ asm_pure_loop
+
+all: $(SUBDIRS)
+$(SUBDIRS):
+ $(Q)$(MAKE) -C $@
+
+INSTALLDIRS = $(SUBDIRS:%=install-%)
+
+install-tests: $(INSTALLDIRS)
+$(INSTALLDIRS):
+ $(Q)$(MAKE) -C $(@:install-%=%) install-tests
+
+CLEANDIRS = $(SUBDIRS:%=clean-%)
+
+clean: $(CLEANDIRS)
+$(CLEANDIRS):
+ $(Q)$(MAKE) -C $(@:clean-%=%) clean >/dev/null
+
+.PHONY: all clean $(SUBDIRS) $(CLEANDIRS) $(INSTALLDIRS)
+
diff --git a/tools/perf/tests/shell/tools/coresight/Makefile.miniconfig b/tools/perf/tests/shell/tools/coresight/Makefile.miniconfig
new file mode 100644
index 000000000000..cedd26c6a0eb
--- /dev/null
+++ b/tools/perf/tests/shell/tools/coresight/Makefile.miniconfig
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
+
+ifndef DESTDIR
+prefix ?= $(HOME)
+endif
+
+DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
+perfexecdir = libexec/perf-core
+perfexec_instdir = $(perfexecdir)
+
+ifneq ($(filter /%,$(firstword $(perfexecdir))),)
+perfexec_instdir = $(perfexecdir)
+else
+perfexec_instdir = $(prefix)/$(perfexecdir)
+endif
+
+perfexec_instdir_SQ = $(subst ','\'',$(perfexec_instdir))
+INSTALL = install
+
+include ../../../../../../scripts/Makefile.include
+include ../../../../../../scripts/Makefile.arch
+include ../../../../../../scripts/utilities.mak
diff --git a/tools/perf/tests/shell/tools/coresight/asm_pure_loop/Makefile b/tools/perf/tests/shell/tools/coresight/asm_pure_loop/Makefile
new file mode 100644
index 000000000000..10c5a60cb71c
--- /dev/null
+++ b/tools/perf/tests/shell/tools/coresight/asm_pure_loop/Makefile
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0
+# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
+
+include ../Makefile.miniconfig
+
+BIN=asm_pure_loop
+LIB=
+
+all: $(BIN)
+
+$(BIN): $(BIN).S
+ifdef CORESIGHT
+ifeq ($(ARCH),arm64)
+ $(Q)$(CC) $(BIN).S -nostdlib -static -o $(BIN) $(LIB)
+endif
+endif
+
+install-tests: all
+ifdef CORESIGHT
+ifeq ($(ARCH),arm64)
+ $(call QUIET_INSTALL, tests) \
+ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/tools/$(BIN)'; \
+ $(INSTALL) $(BIN) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/tools/$(BIN)/$(BIN)'
+endif
+endif
+
+clean:
+ $(Q)$(RM) -f $(BIN)
+
+.PHONY: all clean install-tests
diff --git a/tools/perf/tests/shell/tools/coresight/asm_pure_loop/asm_pure_loop.S b/tools/perf/tests/shell/tools/coresight/asm_pure_loop/asm_pure_loop.S
new file mode 100644
index 000000000000..262876451021
--- /dev/null
+++ b/tools/perf/tests/shell/tools/coresight/asm_pure_loop/asm_pure_loop.S
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Tamas Zsoldos <tamas.zsoldos@arm.com>, 2021 */
+
+.globl _start
+_start:
+ mov x0, 0x000fffff
+ mov x1, xzr
+loop:
+ nop
+ nop
+ cbnz x1, noskip
+ nop
+ nop
+ adrp x2, skip
+ add x2, x2, :lo12:skip
+ br x2
+ nop
+ nop
+noskip:
+ nop
+ nop
+skip:
+ sub x0, x0, 1
+ cbnz x0, loop
+
+ mov x0, #0
+ mov x8, #93 // __NR_exit syscall
+ svc #0
--
2.32.0
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