@@ -18,6 +18,7 @@ TARGETS += devices/error_logs
TARGETS += devices/probe
TARGETS += dmabuf-heaps
TARGETS += drivers/dma-buf
+TARGETS += drivers/hwtracing/coresight
TARGETS += drivers/s390x/uvdevice
TARGETS += drivers/net
TARGETS += drivers/net/bonding
new file mode 100644
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+TEST_PROGS = sysfs_test_trace.sh
+
+include ../../../lib.mk
new file mode 100644
@@ -0,0 +1,7 @@
+CONFIG_CORESIGHT=y
+CONFIG_CORESIGHT_LINKS_AND_SINKS=y
+CONFIG_CORESIGHT_LINK_AND_SINK_TMC=y
+CONFIG_CORESIGHT_SINK_ETBV10
+CONFIG_CORESIGHT_SOURCE_ETM3X
+CONFIG_CORESIGHT_SOURCE_ETM4X=y
+CONFIG_CORESIGHT_TRBE=y
new file mode 100755
@@ -0,0 +1,146 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2024 Marvell.
+
+# Test Arm CoreSight trace capture in sysfs mode
+# Based on tools/perf/tests/shell/test_arm_coresight.sh
+
+glb_err=0
+
+arm_cs_report() {
+ if [ $2 != 0 ]; then
+ echo "$1: FAIL"
+ glb_err=$2
+ else
+ echo "$1: PASS"
+ fi
+}
+
+is_device_sink() {
+ # If the node of "enable_sink" is existed under the device path, this
+ # means the device is a sink device. Need to exclude 'tpiu' since it
+ # doesn't have a readable file.
+ echo "$1" | grep -E -q -v "tpiu"
+
+ if [ $? -eq 0 ] && [ -e "$1/enable_sink" ]; then
+
+ return 0
+ else
+ return 1
+ fi
+}
+
+# Configure sink for buffer mode
+cfg_sink_buf_mode() {
+ sink_dev=$1
+ mode=$2
+ # Set buffer mode if supported
+ if [ -e "$sink_dev/buf_modes_available" ]; then
+ cat $sink_dev/buf_modes_available | grep -E -q $mode
+ if [ $? -eq 0 ]; then
+ echo $mode > $sink_dev/buf_mode_preferred
+ return 0
+ fi
+ fi
+
+ return 1
+}
+
+run_app() {
+
+ taskset -c $1 dd if=/dev/urandom of=/dev/null bs=1M count=64
+}
+
+sysfs_trace() {
+ src_dev=$1
+ sink_dev=$2
+ cpu=$3
+
+ # Enable sink device
+ echo 1 > $sink_dev/enable_sink
+ # Enable source device
+ echo 1 > $src_dev/enable_source
+
+ # Run app to be traced
+ run_app $cpu
+
+ # Read back trace data
+ dd if=/dev/$sink_dev_name of=/tmp/tracedata
+
+ # Verify if read is successful
+ err=$?
+
+ # Disable source device
+ echo 0 > $src_dev/enable_source
+
+ # Diskable sink device
+ echo 0 > $sink_dev/enable_sink
+
+ arm_cs_report "CoreSight path testing (CPU$cpu -> $sink_dev_name)" $err
+}
+
+try_sysfs_trace_resrv_buf() {
+ src_dev=$1
+ sink_dev=$2
+ cpu=$3
+
+ # Configure the resrved buffer mode if available
+ cfg_sink_buf_mode $sink_dev "resrv"
+ if [ $? -eq 0 ]; then
+ echo "Running sysfs trace with resrv buf mode"
+ sysfs_trace $src_dev $sink_dev $cpu
+ # Restore buffer mode
+ cfg_sink_buf_mode $sink_dev "auto"
+ if [ $? -eq 1 ]; then
+ echo "Failed to restore default buf mode"
+ fi
+ fi
+}
+
+arm_cs_iterate_devices() {
+ src_dev=$1
+ cpu=$3
+ for cdev in $2/connections/out\:*; do
+
+ # Skip testing if it's not a directory
+ ! [ -d $cdev ] && continue;
+
+ # Read out its symbol link file name
+ sink_dev=`readlink -f $cdev`
+
+ # Extract device name from path, e.g.
+ # sink_dev = '/sys/devices/platform/20010000.etf/tmc_etf0'
+ # `> sink_dev_name = 'tmc_etf0'
+ sink_dev_name=$(basename $sink_dev)
+
+ if is_device_sink $sink_dev; then
+ # Run trace with resrv buf mode (if available)
+ try_sysfs_trace_resrv_buf $src_dev $sink_dev $cpu
+
+ # Run the default mode
+ echo "Running sysfs trace with default settings"
+ sysfs_trace $src_dev $sink_dev $cpu
+ fi
+
+ arm_cs_iterate_devices $src_dev $cdev $cpu
+
+ done
+}
+
+arm_cs_etm_traverse_path_test() {
+ # Iterate for every ETM device
+ for dev in /sys/bus/event_source/devices/cs_etm/cpu*; do
+ # Canonicalize the path
+ dev=`readlink -f $dev`
+
+ # Find the ETM device belonging to which CPU
+ cpu=`cat $dev/cpu`
+
+ # Use depth-first search (DFS) to iterate outputs
+ arm_cs_iterate_devices $dev $dev $cpu
+ done
+}
+
+arm_cs_etm_traverse_path_test
+
+exit $glb_err
Add sysfs mode selftest for ARM Coresight hardware tracer. The test will run below sequence for all possible sinks for every trace source available on the system. 1. Enable source and sink device to start tracing in sysfs mode 3. Run a standard dd command to be traced 4. Stop tracing 5. Readback tracedata - Test case is pass if the readback of tracedata is success else failure. - In case of ETR sink, the test is run with both default buffer mode and reserved buffer mode(if available). Sample output: selftests: drivers/hwtracing/coresight: sysfs_test_trace.sh Running sysfs trace with default settings 64+0 records in 64+0 records out 67108864 bytes (67 MB, 64 MiB) copied, 0.196945 s, 341 MB/s 32+0 records in 32+0 records out 16384 bytes (16 kB, 16 KiB) copied, 0.000805288 s, 20.3 MB/s CoreSight path testing (CPU0 -> tmc_etf0): PASS Signed-off-by: Linu Cherian <lcherian@marvell.com> --- Changelog from v1: - Added test description in commit message suggested by Shuah - Added config dependency file suggested by Shuah - Added TARGETS as suggested by James - Skipped TPIU as suggested by James - Added Reviewed-by tag tools/testing/selftests/Makefile | 1 + .../drivers/hwtracing/coresight/Makefile | 5 + .../drivers/hwtracing/coresight/config | 7 + .../hwtracing/coresight/sysfs_test_trace.sh | 146 ++++++++++++++++++ 4 files changed, 159 insertions(+) create mode 100644 tools/testing/selftests/drivers/hwtracing/coresight/Makefile create mode 100644 tools/testing/selftests/drivers/hwtracing/coresight/config create mode 100755 tools/testing/selftests/drivers/hwtracing/coresight/sysfs_test_trace.sh