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Generated with Intel SOF community build, identification "Build #5357". Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
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#!/usr/bin/env python3 | ||
# SPDX-License-Identifier: BSD-3-Clause | ||
# | ||
# Copyright (c) 2022, Intel Corporation. All rights reserved. | ||
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#pylint:disable=mixed-indentation | ||
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# Tool to stream data from Linux SOF driver "mtrace" debugfs | ||
# interface to standard output. Plain "cat" is not sufficient | ||
# as each read() syscall returns log data with a 32bit binary | ||
# header, containing the payload length. | ||
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import struct | ||
import os | ||
import sys | ||
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READ_BUFFER = 16384 | ||
MTRACE_FILE = "/sys/kernel/debug/sof/mtrace/core0" | ||
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fd = os.open(MTRACE_FILE, os.O_RDONLY) | ||
while fd >= 0: | ||
# direct unbuffered os.read() must be used to comply with | ||
# debugfs protocol used. each non-zero read will return | ||
# a buffer containing a 32bit header and a payload | ||
read_bytes = os.read(fd, READ_BUFFER) | ||
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# handle end-of-file | ||
if len(read_bytes) == 0: | ||
continue | ||
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if len(read_bytes) <= 4: | ||
continue | ||
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header = struct.unpack('I', read_bytes[0:4]) | ||
data_len = header[0] | ||
data = read_bytes[4:4+data_len] | ||
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os.write(sys.stdout.fileno(), data) |
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