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#!/usr/bin/env python3
#
# Copyright 2023 Ettus Research, a National Instrument Brand
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
"""
Repeatedly runs the requested build until it builds successfully and meets
timing, up to a maximum number of tries. Builds will be retried when they
fail with timing errors or other errors that might not reoccur. Builds will
stop if a an unrecognized error occurs.
"""
import sys
import argparse
import subprocess
import logging
import re
import random
def parse_args():
"""Parse the command line arguments.
Returns:
Populated namespace containing the arguments and their values.
"""
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
parser.add_argument(
"--target",
"-t",
type=str,
required=True,
help="FPGA make target to build (e.g., X310_XG).",
)
parser.add_argument(
"--num",
"-n",
type=int,
default=4,
required=False,
help="Number of times to attempt the build.",
)
parser.add_argument(
"--persistent",
"-p",
action="store_true",
default=False,
help=(
"Continue retrying builds regardless of which error occurs, "
"up to the specified number of attempts."
),
)
parser.add_argument(
"--seed",
"-s",
type=int,
default=0,
required=False,
help="Initial seed value to use.",
)
return parser.parse_args()
def run_fpga_build(build_seed, target):
"""Performs one iteration of an FPGA build.
Args:
build_seed: 32-bit signed integer to seed the FPGA build.
target: Make target name (e.g., X310_XG).
Returns:
0: The build succeeded.
1: There was a timing or other error that might not reoccur.
2: There was some other error that should cause us to stop trying.
"""
output = ""
cmd = f'/bin/bash -c "make {target} BUILD_SEED={build_seed}"'
with subprocess.Popen(
cmd,
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
bufsize=1,
universal_newlines=True,
) as proc:
for line in proc.stdout:
print(line, end="")
output += line
if proc.returncode != 0:
# Regular expressions for error strings to search for that would tell
# us we should try again.
transient_errors = [
# Standard timing error:
"The design did not satisfy timing constraints",
# Known issue fixed in Vivado 2021.2:
(
"Router encountered a fatal exception of type .*"
"Trying to tool lock on already tool locked arc"
),
]
for error_string in transient_errors:
if re.search(error_string, output):
return 1
return 2
return 0
def next_build_seed(previous_seed):
"""Determines the next seed to use based on the previous seed. This creates
a reproducible sequence of values with a specific initial value.
Args:
previous_seed: The previous integer seed from which to determine the
new seed.
Returns:
The next build seed value in the range of a 32-bit signed integer.
"""
random.seed(previous_seed)
return random.randint(-0x80000000, 0x7FFFFFFF)
def main():
"""Run the requested builds.
Returns:
The status of the last build (0 if successful, non-zero if the build
failed).
"""
logging.basicConfig(format="[REPEAT BUILD][%(levelname)s] %(message)s")
logging.root.setLevel(logging.INFO)
args = parse_args()
build_seed = args.seed
status = 128
try:
for build_num in range(1, args.num + 1):
logging.info(f"Starting FPGA build {build_num} with seed {build_seed}")
status = run_fpga_build(build_seed, args.target)
logging.info(f"Finished FPGA build {build_num}")
if status == 0:
logging.info(f"FPBA build succeeded on attempt number {build_num}")
break
elif build_num == args.num:
logging.error("Reached maximum number of FPGA build attempts")
elif status == 1:
logging.info("FPGA build will be restarted due to unsuccessful attempt")
elif status == 2 and not args.persistent:
logging.error("Stopping due to unexpected FPGA build error")
break
build_seed = next_build_seed(build_seed)
except (KeyboardInterrupt):
logging.info("Received SIGINT. Aborting . . .")
# Return normal Bash value for SIGINT (128+2)
return 130
return status
if __name__ == "__main__":
sys.exit(main())
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