mirror of https://github.com/thesofproject/sof.git
39 lines
1.0 KiB
Python
39 lines
1.0 KiB
Python
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#!/usr/bin/env python3
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# SPDX-License-Identifier: BSD-3-Clause
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#
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# 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
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# interface to standard output. Plain "cat" is not sufficient
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# as each read() syscall returns log data with a 32bit binary
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# header, containing the payload length.
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import struct
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import os
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import sys
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READ_BUFFER = 16384
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MTRACE_FILE = "/sys/kernel/debug/sof/mtrace/core0"
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fd = os.open(MTRACE_FILE, os.O_RDONLY)
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while fd >= 0:
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# direct unbuffered os.read() must be used to comply with
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# debugfs protocol used. each non-zero read will return
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# a buffer containing a 32bit header and a payload
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read_bytes = os.read(fd, READ_BUFFER)
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# handle end-of-file
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if len(read_bytes) == 0:
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continue
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if len(read_bytes) <= 4:
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continue
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header = struct.unpack('I', read_bytes[0:4])
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data_len = header[0]
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data = read_bytes[4:4+data_len]
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os.write(sys.stdout.fileno(), data)
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