991 lines
40 KiB
Python
991 lines
40 KiB
Python
#
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# This file is part of LiteX.
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#
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# Copyright (c) 2020 Antmicro <www.antmicro.com>
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# SPDX-License-Identifier: BSD-2-Clause
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import unittest
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import random
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from migen import *
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from litex.soc.interconnect.axi import *
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from litex.soc.interconnect import wishbone, csr_bus
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# Helpers ------------------------------------------------------------------------------------------
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def _int_or_call(int_or_func):
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if callable(int_or_func):
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return int_or_func()
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return int_or_func
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@passive
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def timeout_generator(ticks):
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import os
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for i in range(ticks):
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if os.environ.get("TIMEOUT_DEBUG", "") == "1":
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print("tick {}".format(i))
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yield
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raise TimeoutError("Timeout after %d ticks" % ticks)
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class AXILiteChecker:
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def __init__(self, ready_latency=0, response_latency=0, rdata_generator=None):
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self.ready_latency = ready_latency
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self.response_latency = response_latency
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self.rdata_generator = rdata_generator or (lambda adr: 0xbaadc0de)
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self.writes = [] # (addr, data, strb)
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self.reads = [] # (addr, data)
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def delay(self, latency):
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for _ in range(_int_or_call(latency)):
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yield
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def handle_write(self, axi_lite):
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# aw
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while not (yield axi_lite.aw.valid):
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yield
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yield from self.delay(self.ready_latency)
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addr = (yield axi_lite.aw.addr)
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yield axi_lite.aw.ready.eq(1)
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yield
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yield axi_lite.aw.ready.eq(0)
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while not (yield axi_lite.w.valid):
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yield
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yield from self.delay(self.ready_latency)
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# w
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data = (yield axi_lite.w.data)
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strb = (yield axi_lite.w.strb)
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yield axi_lite.w.ready.eq(1)
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yield
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yield axi_lite.w.ready.eq(0)
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yield from self.delay(self.response_latency)
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# b
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yield axi_lite.b.valid.eq(1)
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yield axi_lite.b.resp.eq(RESP_OKAY)
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yield
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while not (yield axi_lite.b.ready):
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yield
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yield axi_lite.b.valid.eq(0)
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self.writes.append((addr, data, strb))
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def handle_read(self, axi_lite):
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# ar
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while not (yield axi_lite.ar.valid):
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yield
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yield from self.delay(self.ready_latency)
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addr = (yield axi_lite.ar.addr)
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yield axi_lite.ar.ready.eq(1)
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yield
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yield axi_lite.ar.ready.eq(0)
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yield from self.delay(self.response_latency)
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# r
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data = self.rdata_generator(addr)
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yield axi_lite.r.valid.eq(1)
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yield axi_lite.r.resp.eq(RESP_OKAY)
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yield axi_lite.r.data.eq(data)
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yield
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while not (yield axi_lite.r.ready):
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yield
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yield axi_lite.r.valid.eq(0)
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yield axi_lite.r.data.eq(0)
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self.reads.append((addr, data))
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@passive
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def handler(self, axi_lite):
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while True:
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if (yield axi_lite.aw.valid):
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yield from self.handle_write(axi_lite)
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if (yield axi_lite.ar.valid):
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yield from self.handle_read(axi_lite)
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yield
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@passive
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def _write_handler(self, axi_lite):
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while True:
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yield from self.handle_write(axi_lite)
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yield
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@passive
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def _read_handler(self, axi_lite):
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while True:
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yield from self.handle_read(axi_lite)
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yield
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def parallel_handlers(self, axi_lite):
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return self._write_handler(axi_lite), self._read_handler(axi_lite)
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class AXILitePatternGenerator:
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def __init__(self, axi_lite, pattern, delay=0):
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# patter: (rw, addr, data)
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self.axi_lite = axi_lite
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self.pattern = pattern
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self.delay = delay
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self.errors = 0
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self.read_errors = []
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self.resp_errors = {"w": 0, "r": 0}
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def handler(self):
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for rw, addr, data in self.pattern:
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assert rw in ["w", "r"]
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if rw == "w":
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strb = 2**len(self.axi_lite.w.strb) - 1
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resp = (yield from self.axi_lite.write(addr, data, strb))
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else:
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rdata, resp = (yield from self.axi_lite.read(addr))
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if rdata != data:
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self.read_errors.append((rdata, data))
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self.errors += 1
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if resp != RESP_OKAY:
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self.resp_errors[rw] += 1
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self.errors += 1
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for _ in range(_int_or_call(self.delay)):
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yield
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for _ in range(16):
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yield
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# TestAXILite --------------------------------------------------------------------------------------
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class TestAXILite(unittest.TestCase):
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def test_wishbone2axilite2wishbone(self, data_width=32, address_width=32):
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class DUT(Module):
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def __init__(self):
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self.wishbone = wishbone.Interface(data_width=data_width,
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adr_width=address_width - log2_int(data_width // 8))
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# # #
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axi_lite = AXILiteInterface(data_width=data_width, address_width=address_width)
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wb = wishbone.Interface(data_width=data_width, adr_width=address_width - log2_int(data_width // 8))
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wishbone2axi = Wishbone2AXILite(self.wishbone, axi_lite)
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axi2wishbone = AXILite2Wishbone(axi_lite, wb)
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self.submodules += wishbone2axi, axi2wishbone
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sram = wishbone.SRAM(1024, init=[0x12345678, 0xa55aa55a])
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self.submodules += sram
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self.comb += wb.connect(sram.bus)
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def generator(dut):
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dut.errors = 0
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if (yield from dut.wishbone.read(0)) != 0x12345678:
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dut.errors += 1
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if (yield from dut.wishbone.read(1)) != 0xa55aa55a:
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dut.errors += 1
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for i in range(32):
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yield from dut.wishbone.write(i, i)
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for i in range(32):
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if (yield from dut.wishbone.read(i)) != i:
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dut.errors += 1
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dut = DUT()
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run_simulation(dut, [generator(dut)])
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self.assertEqual(dut.errors, 0)
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def test_wishbone2axilite2wishbone_dw64(self):
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return self.test_wishbone2axilite2wishbone(data_width=64)
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def test_axilite2axi2mem(self):
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class DUT(Module):
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def __init__(self, mem_bus="wishbone"):
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self.axi_lite = AXILiteInterface()
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axi = AXIInterface()
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self.submodules.axil2axi = AXILite2AXI(self.axi_lite, axi)
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interface_cls, converter_cls, sram_cls = {
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"wishbone": (wishbone.Interface, AXI2Wishbone, wishbone.SRAM),
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"axi_lite": (AXILiteInterface, AXI2AXILite, AXILiteSRAM),
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}[mem_bus]
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bus_kwargs = {"adr_width" : 30} if mem_bus == "wishbone" else {}
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bus = interface_cls(**bus_kwargs)
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self.submodules += converter_cls(axi, bus)
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sram = sram_cls(1024, init=[0x12345678, 0xa55aa55a])
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self.submodules += sram
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self.comb += bus.connect(sram.bus)
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def generator(axi_lite, datas, resps):
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data, resp = (yield from axi_lite.read(0x00))
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resps.append((resp, RESP_OKAY))
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datas.append((data, 0x12345678))
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data, resp = (yield from axi_lite.read(0x04))
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resps.append((resp, RESP_OKAY))
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datas.append((data, 0xa55aa55a))
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for i in range(32):
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resp = (yield from axi_lite.write(4*i, i))
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resps.append((resp, RESP_OKAY))
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for i in range(32):
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data, resp = (yield from axi_lite.read(4*i))
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resps.append((resp, RESP_OKAY))
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datas.append((data, i))
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for mem_bus in ["wishbone", "axi_lite"]:
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with self.subTest(mem_bus=mem_bus):
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# to have more verbose error messages store errors in list((actual, expected))
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datas = []
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resps = []
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def actual_expected(results): # split into (list(actual), list(expected))
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return list(zip(*results))
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dut = DUT(mem_bus)
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run_simulation(dut, [generator(dut.axi_lite, datas, resps)])
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self.assertEqual(*actual_expected(resps))
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msg = "\n".join("0x{:08x} vs 0x{:08x}".format(actual, expected) for actual, expected in datas)
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self.assertEqual(*actual_expected(datas), msg="actual vs expected:\n" + msg)
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def test_axilite2csr(self):
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@passive
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def csr_mem_handler(csr, mem):
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while True:
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adr = (yield csr.adr)
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yield csr.dat_r.eq(mem[adr])
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if (yield csr.we):
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mem[adr] = (yield csr.dat_w)
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yield
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class DUT(Module):
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def __init__(self):
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self.axi_lite = AXILiteInterface()
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self.csr = csr_bus.Interface()
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self.submodules.axilite2csr = AXILite2CSR(self.axi_lite, self.csr)
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self.errors = 0
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prng = random.Random(42)
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mem_ref = [prng.randrange(255) for i in range(100)]
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def generator(dut):
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dut.errors = 0
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for adr, ref in enumerate(mem_ref):
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adr = adr << 2
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data, resp = (yield from dut.axi_lite.read(adr))
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self.assertEqual(resp, 0b00)
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if data != ref:
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dut.errors += 1
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write_data = [prng.randrange(255) for _ in mem_ref]
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for adr, wdata in enumerate(write_data):
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adr = adr << 2
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resp = (yield from dut.axi_lite.write(adr, wdata))
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self.assertEqual(resp, 0b00)
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rdata, resp = (yield from dut.axi_lite.read(adr))
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self.assertEqual(resp, 0b00)
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if rdata != wdata:
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dut.errors += 1
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dut = DUT()
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mem = [v for v in mem_ref]
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run_simulation(dut, [generator(dut), csr_mem_handler(dut.csr, mem)])
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self.assertEqual(dut.errors, 0)
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def test_axilite_sram(self):
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class DUT(Module):
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def __init__(self, size, init):
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self.axi_lite = AXILiteInterface()
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self.submodules.sram = AXILiteSRAM(size, init=init, bus=self.axi_lite)
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self.errors = 0
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def generator(dut, ref_init):
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for adr, ref in enumerate(ref_init):
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adr = adr << 2
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data, resp = (yield from dut.axi_lite.read(adr))
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self.assertEqual(resp, 0b00)
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if data != ref:
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dut.errors += 1
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write_data = [prng.randrange(255) for _ in ref_init]
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for adr, wdata in enumerate(write_data):
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adr = adr << 2
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resp = (yield from dut.axi_lite.write(adr, wdata))
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self.assertEqual(resp, 0b00)
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rdata, resp = (yield from dut.axi_lite.read(adr))
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self.assertEqual(resp, 0b00)
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if rdata != wdata:
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dut.errors += 1
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prng = random.Random(42)
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init = [prng.randrange(2**32) for i in range(100)]
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dut = DUT(size=len(init)*4, init=[v for v in init])
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run_simulation(dut, [generator(dut, init)])
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self.assertEqual(dut.errors, 0)
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def converter_test(self, width_from, width_to, parallel_rw=False,
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write_pattern=None, write_expected=None,
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read_pattern=None, read_expected=None):
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assert not (write_pattern is None and read_pattern is None)
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if write_pattern is None:
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write_pattern = []
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write_expected = []
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elif len(write_pattern[0]) == 2:
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# add w.strb
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write_pattern = [(adr, data, 2**(width_from//8)-1) for adr, data in write_pattern]
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if read_pattern is None:
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read_pattern = []
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read_expected = []
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class DUT(Module):
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def __init__(self, width_from, width_to):
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self.master = AXILiteInterface(data_width=width_from)
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self.slave = AXILiteInterface(data_width=width_to)
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self.submodules.converter = AXILiteConverter(self.master, self.slave)
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prng = random.Random(42)
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def write_generator(axi_lite):
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for addr, data, strb in write_pattern or []:
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resp = (yield from axi_lite.write(addr, data, strb))
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self.assertEqual(resp, RESP_OKAY)
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for _ in range(prng.randrange(3)):
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yield
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for _ in range(16):
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yield
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def read_generator(axi_lite):
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for addr, refdata in read_pattern or []:
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data, resp = (yield from axi_lite.read(addr))
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self.assertEqual(resp, RESP_OKAY)
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self.assertEqual(data, refdata)
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for _ in range(prng.randrange(3)):
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yield
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for _ in range(4):
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yield
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def sequential_generator(axi_lite):
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yield from write_generator(axi_lite)
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yield from read_generator(axi_lite)
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def rdata_generator(adr):
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for a, v in read_expected:
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if a == adr:
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return v
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return 0xbaadc0de
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_latency = 0
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def latency():
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nonlocal _latency
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_latency = (_latency + 1) % 3
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return _latency
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dut = DUT(width_from=width_from, width_to=width_to)
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checker = AXILiteChecker(ready_latency=latency, rdata_generator=rdata_generator)
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if parallel_rw:
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generators = [write_generator(dut.master), read_generator(dut.master)]
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else:
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generators = [sequential_generator(dut.master)]
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generators += checker.parallel_handlers(dut.slave)
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run_simulation(dut, generators)
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self.assertEqual(checker.writes, write_expected)
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self.assertEqual(checker.reads, read_expected)
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def test_axilite_down_converter_32to16(self):
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write_pattern = [
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(0x00000000, 0x22221111),
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(0x00000004, 0x44443333),
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(0x00000008, 0x66665555),
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(0x00000100, 0x88887777),
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]
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write_expected = [
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(0x00000000, 0x1111, 0b11),
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(0x00000002, 0x2222, 0b11),
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(0x00000004, 0x3333, 0b11),
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(0x00000006, 0x4444, 0b11),
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(0x00000008, 0x5555, 0b11),
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(0x0000000a, 0x6666, 0b11),
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(0x00000100, 0x7777, 0b11),
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(0x00000102, 0x8888, 0b11),
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]
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read_pattern = write_pattern
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read_expected = [(adr, data) for (adr, data, _) in write_expected]
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for parallel in [False, True]:
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with self.subTest(parallel=parallel):
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self.converter_test(width_from=32, width_to=16, parallel_rw=parallel,
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write_pattern=write_pattern, write_expected=write_expected,
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read_pattern=read_pattern, read_expected=read_expected)
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def test_axilite_down_converter_32to8(self):
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write_pattern = [
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(0x00000000, 0x44332211),
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(0x00000004, 0x88776655),
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]
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write_expected = [
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(0x00000000, 0x11, 0b1),
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(0x00000001, 0x22, 0b1),
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(0x00000002, 0x33, 0b1),
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(0x00000003, 0x44, 0b1),
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(0x00000004, 0x55, 0b1),
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(0x00000005, 0x66, 0b1),
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(0x00000006, 0x77, 0b1),
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(0x00000007, 0x88, 0b1),
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]
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read_pattern = write_pattern
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read_expected = [(adr, data) for (adr, data, _) in write_expected]
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for parallel in [False, True]:
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with self.subTest(parallel=parallel):
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self.converter_test(width_from=32, width_to=8, parallel_rw=parallel,
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write_pattern=write_pattern, write_expected=write_expected,
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read_pattern=read_pattern, read_expected=read_expected)
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def test_axilite_down_converter_64to32(self):
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write_pattern = [
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(0x00000000, 0x2222222211111111),
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(0x00000008, 0x4444444433333333),
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]
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write_expected = [
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(0x00000000, 0x11111111, 0b1111),
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(0x00000004, 0x22222222, 0b1111),
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(0x00000008, 0x33333333, 0b1111),
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(0x0000000c, 0x44444444, 0b1111),
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]
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read_pattern = write_pattern
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read_expected = [(adr, data) for (adr, data, _) in write_expected]
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for parallel in [False, True]:
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with self.subTest(parallel=parallel):
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self.converter_test(width_from=64, width_to=32, parallel_rw=parallel,
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write_pattern=write_pattern, write_expected=write_expected,
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read_pattern=read_pattern, read_expected=read_expected)
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def test_axilite_down_converter_strb(self):
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write_pattern = [
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(0x00000000, 0x22221111, 0b1100),
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(0x00000004, 0x44443333, 0b1111),
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(0x00000008, 0x66665555, 0b1011),
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(0x00000100, 0x88887777, 0b0011),
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]
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write_expected = [
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(0x00000002, 0x2222, 0b11),
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(0x00000004, 0x3333, 0b11),
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(0x00000006, 0x4444, 0b11),
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(0x00000008, 0x5555, 0b11),
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(0x0000000a, 0x6666, 0b10),
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(0x00000100, 0x7777, 0b11),
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|
]
|
|
self.converter_test(width_from=32, width_to=16,
|
|
write_pattern=write_pattern, write_expected=write_expected)
|
|
|
|
def test_axilite_up_converter_16to32(self):
|
|
write_pattern = [
|
|
(0x00000000, 0x1111),
|
|
(0x00000002, 0x2222),
|
|
(0x00000006, 0x3333),
|
|
(0x00000004, 0x4444),
|
|
(0x00000102, 0x5555),
|
|
]
|
|
write_expected = [
|
|
(0x00000000, 0x00001111, 0b0011),
|
|
(0x00000000, 0x22220000, 0b1100),
|
|
(0x00000004, 0x33330000, 0b1100),
|
|
(0x00000004, 0x00004444, 0b0011),
|
|
(0x00000100, 0x55550000, 0b1100),
|
|
]
|
|
read_pattern = write_pattern
|
|
read_expected = [
|
|
(0x00000000, 0x22221111),
|
|
(0x00000000, 0x22221111),
|
|
(0x00000004, 0x33334444),
|
|
(0x00000004, 0x33334444),
|
|
(0x00000100, 0x55550000),
|
|
]
|
|
for parallel in [False, True]:
|
|
with self.subTest(parallel=parallel):
|
|
self.converter_test(width_from=16, width_to=32, parallel_rw=parallel,
|
|
write_pattern=write_pattern, write_expected=write_expected,
|
|
read_pattern=read_pattern, read_expected=read_expected)
|
|
|
|
def test_axilite_up_converter_8to32(self):
|
|
write_pattern = [
|
|
(0x00000000, 0x11),
|
|
(0x00000001, 0x22),
|
|
(0x00000003, 0x33),
|
|
(0x00000002, 0x44),
|
|
(0x00000101, 0x55),
|
|
]
|
|
write_expected = [
|
|
(0x00000000, 0x00000011, 0b0001),
|
|
(0x00000000, 0x00002200, 0b0010),
|
|
(0x00000000, 0x33000000, 0b1000),
|
|
(0x00000000, 0x00440000, 0b0100),
|
|
(0x00000100, 0x00005500, 0b0010),
|
|
]
|
|
read_pattern = write_pattern
|
|
read_expected = [
|
|
(0x00000000, 0x33442211),
|
|
(0x00000000, 0x33442211),
|
|
(0x00000000, 0x33442211),
|
|
(0x00000000, 0x33442211),
|
|
(0x00000100, 0x00005500),
|
|
]
|
|
for parallel in [False, True]:
|
|
with self.subTest(parallel=parallel):
|
|
self.converter_test(width_from=8, width_to=32, parallel_rw=parallel,
|
|
write_pattern=write_pattern, write_expected=write_expected,
|
|
read_pattern=read_pattern, read_expected=read_expected)
|
|
|
|
def test_axilite_up_converter_strb(self):
|
|
write_pattern = [
|
|
(0x00000000, 0x1111, 0b10),
|
|
(0x00000002, 0x2222, 0b11),
|
|
(0x00000006, 0x3333, 0b11),
|
|
(0x00000004, 0x4444, 0b01),
|
|
(0x00000102, 0x5555, 0b01),
|
|
]
|
|
write_expected = [
|
|
(0x00000000, 0x00001111, 0b0010),
|
|
(0x00000000, 0x22220000, 0b1100),
|
|
(0x00000004, 0x33330000, 0b1100),
|
|
(0x00000004, 0x00004444, 0b0001),
|
|
(0x00000100, 0x55550000, 0b0100),
|
|
]
|
|
self.converter_test(width_from=16, width_to=32,
|
|
write_pattern=write_pattern, write_expected=write_expected)
|
|
|
|
# TestAXILiteInterconnet ---------------------------------------------------------------------------
|
|
|
|
class TestAXILiteInterconnect(unittest.TestCase):
|
|
def test_interconnect_p2p(self):
|
|
class DUT(Module):
|
|
def __init__(self):
|
|
self.master = master = AXILiteInterface()
|
|
self.slave = slave = AXILiteInterface()
|
|
self.submodules.interconnect = AXILiteInterconnectPointToPoint(master, slave)
|
|
|
|
pattern = [
|
|
("w", 0x00000004, 0x11111111),
|
|
("w", 0x0000000c, 0x22222222),
|
|
("r", 0x00000010, 0x33333333),
|
|
("r", 0x00000018, 0x44444444),
|
|
]
|
|
|
|
def rdata_generator(adr):
|
|
for rw, a, v in pattern:
|
|
if rw == "r" and a == adr:
|
|
return v
|
|
return 0xbaadc0de
|
|
|
|
dut = DUT()
|
|
checker = AXILiteChecker(rdata_generator=rdata_generator)
|
|
generators = [
|
|
AXILitePatternGenerator(dut.master, pattern).handler(),
|
|
checker.handler(dut.slave),
|
|
]
|
|
run_simulation(dut, generators)
|
|
self.assertEqual(checker.writes, [(addr, data, 0b1111) for rw, addr, data in pattern if rw == "w"])
|
|
self.assertEqual(checker.reads, [(addr, data) for rw, addr, data in pattern if rw == "r"])
|
|
|
|
def test_timeout(self):
|
|
class DUT(Module):
|
|
def __init__(self):
|
|
self.master = master = AXILiteInterface()
|
|
self.slave = slave = AXILiteInterface()
|
|
self.submodules.interconnect = AXILiteInterconnectPointToPoint(master, slave)
|
|
self.submodules.timeout = AXILiteTimeout(master, 16)
|
|
|
|
def generator(axi_lite):
|
|
resp = (yield from axi_lite.write(0x00001000, 0x11111111))
|
|
self.assertEqual(resp, RESP_OKAY)
|
|
resp = (yield from axi_lite.write(0x00002000, 0x22222222))
|
|
self.assertEqual(resp, RESP_SLVERR)
|
|
data, resp = (yield from axi_lite.read(0x00003000))
|
|
self.assertEqual(resp, RESP_SLVERR)
|
|
self.assertEqual(data, 0xffffffff)
|
|
yield
|
|
|
|
def checker(axi_lite):
|
|
for _ in range(16):
|
|
yield
|
|
yield axi_lite.aw.ready.eq(1)
|
|
yield axi_lite.w.ready.eq(1)
|
|
yield
|
|
yield axi_lite.aw.ready.eq(0)
|
|
yield axi_lite.w.ready.eq(0)
|
|
yield axi_lite.b.valid.eq(1)
|
|
yield
|
|
while not (yield axi_lite.b.ready):
|
|
yield
|
|
yield axi_lite.b.valid.eq(0)
|
|
|
|
dut = DUT()
|
|
generators = [
|
|
generator(dut.master),
|
|
checker(dut.slave),
|
|
timeout_generator(300),
|
|
]
|
|
run_simulation(dut, generators)
|
|
|
|
def test_arbiter_order(self):
|
|
class DUT(Module):
|
|
def __init__(self, n_masters):
|
|
self.masters = [AXILiteInterface() for _ in range(n_masters)]
|
|
self.slave = AXILiteInterface()
|
|
self.submodules.arbiter = AXILiteArbiter(self.masters, self.slave)
|
|
|
|
def generator(n, axi_lite, delay=0):
|
|
def gen(i):
|
|
return 100*n + i
|
|
|
|
for i in range(4):
|
|
resp = (yield from axi_lite.write(gen(i), gen(i)))
|
|
self.assertEqual(resp, RESP_OKAY)
|
|
for _ in range(delay):
|
|
yield
|
|
for i in range(4):
|
|
data, resp = (yield from axi_lite.read(gen(i)))
|
|
self.assertEqual(resp, RESP_OKAY)
|
|
for _ in range(delay):
|
|
yield
|
|
for _ in range(8):
|
|
yield
|
|
|
|
n_masters = 3
|
|
|
|
# with no delay each master will do all transfers at once
|
|
with self.subTest(delay=0):
|
|
dut = DUT(n_masters)
|
|
checker = AXILiteChecker()
|
|
generators = [generator(i, master, delay=0) for i, master in enumerate(dut.masters)]
|
|
generators += [timeout_generator(300), checker.handler(dut.slave)]
|
|
run_simulation(dut, generators)
|
|
order = [0, 1, 2, 3, 100, 101, 102, 103, 200, 201, 202, 203]
|
|
self.assertEqual([addr for addr, data, strb in checker.writes], order)
|
|
self.assertEqual([addr for addr, data in checker.reads], order)
|
|
|
|
# with some delay, the round-robin arbiter will iterate over masters
|
|
with self.subTest(delay=1):
|
|
dut = DUT(n_masters)
|
|
checker = AXILiteChecker()
|
|
generators = [generator(i, master, delay=1) for i, master in enumerate(dut.masters)]
|
|
generators += [timeout_generator(300), checker.handler(dut.slave)]
|
|
run_simulation(dut, generators)
|
|
order = [0, 100, 200, 1, 101, 201, 2, 102, 202, 3, 103, 203]
|
|
self.assertEqual([addr for addr, data, strb in checker.writes], order)
|
|
self.assertEqual([addr for addr, data in checker.reads], order)
|
|
|
|
def test_arbiter_holds_grant_until_response(self):
|
|
class DUT(Module):
|
|
def __init__(self, n_masters):
|
|
self.masters = [AXILiteInterface() for _ in range(n_masters)]
|
|
self.slave = AXILiteInterface()
|
|
self.submodules.arbiter = AXILiteArbiter(self.masters, self.slave)
|
|
|
|
def generator(n, axi_lite, delay=0):
|
|
def gen(i):
|
|
return 100*n + i
|
|
|
|
for i in range(4):
|
|
resp = (yield from axi_lite.write(gen(i), gen(i)))
|
|
self.assertEqual(resp, RESP_OKAY)
|
|
for _ in range(delay):
|
|
yield
|
|
for i in range(4):
|
|
data, resp = (yield from axi_lite.read(gen(i)))
|
|
self.assertEqual(resp, RESP_OKAY)
|
|
for _ in range(delay):
|
|
yield
|
|
for _ in range(8):
|
|
yield
|
|
|
|
n_masters = 3
|
|
|
|
# with no delay each master will do all transfers at once
|
|
with self.subTest(delay=0):
|
|
dut = DUT(n_masters)
|
|
checker = AXILiteChecker(response_latency=lambda: 3)
|
|
generators = [generator(i, master, delay=0) for i, master in enumerate(dut.masters)]
|
|
generators += [timeout_generator(300), checker.handler(dut.slave)]
|
|
run_simulation(dut, generators)
|
|
order = [0, 1, 2, 3, 100, 101, 102, 103, 200, 201, 202, 203]
|
|
self.assertEqual([addr for addr, data, strb in checker.writes], order)
|
|
self.assertEqual([addr for addr, data in checker.reads], order)
|
|
|
|
# with some delay, the round-robin arbiter will iterate over masters
|
|
with self.subTest(delay=1):
|
|
dut = DUT(n_masters)
|
|
checker = AXILiteChecker(response_latency=lambda: 3)
|
|
generators = [generator(i, master, delay=1) for i, master in enumerate(dut.masters)]
|
|
generators += [timeout_generator(300), checker.handler(dut.slave)]
|
|
run_simulation(dut, generators)
|
|
order = [0, 100, 200, 1, 101, 201, 2, 102, 202, 3, 103, 203]
|
|
self.assertEqual([addr for addr, data, strb in checker.writes], order)
|
|
self.assertEqual([addr for addr, data in checker.reads], order)
|
|
|
|
def address_decoder(self, i, size=0x100, python=False):
|
|
# bytes to 32-bit words aligned
|
|
_size = (size) >> 2
|
|
_origin = (size * i) >> 2
|
|
if python: # for python integers
|
|
shift = log2_int(_size)
|
|
return lambda a: ((a >> shift) == (_origin >> shift))
|
|
# for migen signals
|
|
return lambda a: (a[log2_int(_size):] == (_origin >> log2_int(_size)))
|
|
|
|
def decoder_test(self, n_slaves, pattern, generator_delay=0):
|
|
class DUT(Module):
|
|
def __init__(self, decoders):
|
|
self.master = AXILiteInterface()
|
|
self.slaves = [AXILiteInterface() for _ in range(len(decoders))]
|
|
slaves = list(zip(decoders, self.slaves))
|
|
self.submodules.decoder = AXILiteDecoder(self.master, slaves)
|
|
|
|
def rdata_generator(adr):
|
|
for rw, a, v in pattern:
|
|
if rw == "r" and a == adr:
|
|
return v
|
|
return 0xbaadc0de
|
|
|
|
dut = DUT([self.address_decoder(i) for i in range(n_slaves)])
|
|
checkers = [AXILiteChecker(rdata_generator=rdata_generator) for _ in dut.slaves]
|
|
|
|
generators = [AXILitePatternGenerator(dut.master, pattern, delay=generator_delay).handler()]
|
|
generators += [checker.handler(slave) for (slave, checker) in zip(dut.slaves, checkers)]
|
|
generators += [timeout_generator(300)]
|
|
run_simulation(dut, generators)
|
|
|
|
return checkers
|
|
|
|
def test_decoder_write(self):
|
|
for delay in [0, 1, 0]:
|
|
with self.subTest(delay=delay):
|
|
slaves = self.decoder_test(n_slaves=3, pattern=[
|
|
("w", 0x010, 1),
|
|
("w", 0x110, 2),
|
|
("w", 0x210, 3),
|
|
("w", 0x011, 1),
|
|
("w", 0x012, 1),
|
|
("w", 0x111, 2),
|
|
("w", 0x112, 2),
|
|
("w", 0x211, 3),
|
|
("w", 0x212, 3),
|
|
], generator_delay=delay)
|
|
|
|
def addr(checker_list):
|
|
return [entry[0] for entry in checker_list]
|
|
|
|
self.assertEqual(addr(slaves[0].writes), [0x010, 0x011, 0x012])
|
|
self.assertEqual(addr(slaves[1].writes), [0x110, 0x111, 0x112])
|
|
self.assertEqual(addr(slaves[2].writes), [0x210, 0x211, 0x212])
|
|
for slave in slaves:
|
|
self.assertEqual(slave.reads, [])
|
|
|
|
def test_decoder_read(self):
|
|
for delay in [0, 1]:
|
|
with self.subTest(delay=delay):
|
|
slaves = self.decoder_test(n_slaves=3, pattern=[
|
|
("r", 0x010, 1),
|
|
("r", 0x110, 2),
|
|
("r", 0x210, 3),
|
|
("r", 0x011, 1),
|
|
("r", 0x012, 1),
|
|
("r", 0x111, 2),
|
|
("r", 0x112, 2),
|
|
("r", 0x211, 3),
|
|
("r", 0x212, 3),
|
|
], generator_delay=delay)
|
|
|
|
def addr(checker_list):
|
|
return [entry[0] for entry in checker_list]
|
|
|
|
self.assertEqual(addr(slaves[0].reads), [0x010, 0x011, 0x012])
|
|
self.assertEqual(addr(slaves[1].reads), [0x110, 0x111, 0x112])
|
|
self.assertEqual(addr(slaves[2].reads), [0x210, 0x211, 0x212])
|
|
for slave in slaves:
|
|
self.assertEqual(slave.writes, [])
|
|
|
|
def test_decoder_read_write(self):
|
|
for delay in [0, 1]:
|
|
with self.subTest(delay=delay):
|
|
slaves = self.decoder_test(n_slaves=3, pattern=[
|
|
("w", 0x010, 1),
|
|
("w", 0x110, 2),
|
|
("r", 0x111, 2),
|
|
("r", 0x011, 1),
|
|
("r", 0x211, 3),
|
|
("w", 0x210, 3),
|
|
], generator_delay=delay)
|
|
|
|
def addr(checker_list):
|
|
return [entry[0] for entry in checker_list]
|
|
|
|
self.assertEqual(addr(slaves[0].writes), [0x010])
|
|
self.assertEqual(addr(slaves[0].reads), [0x011])
|
|
self.assertEqual(addr(slaves[1].writes), [0x110])
|
|
self.assertEqual(addr(slaves[1].reads), [0x111])
|
|
self.assertEqual(addr(slaves[2].writes), [0x210])
|
|
self.assertEqual(addr(slaves[2].reads), [0x211])
|
|
|
|
def test_decoder_stall(self):
|
|
with self.assertRaises(TimeoutError):
|
|
self.decoder_test(n_slaves=3, pattern=[
|
|
("w", 0x300, 1),
|
|
])
|
|
with self.assertRaises(TimeoutError):
|
|
self.decoder_test(n_slaves=3, pattern=[
|
|
("r", 0x300, 1),
|
|
])
|
|
|
|
def interconnect_test(self, master_patterns, slave_decoders,
|
|
master_delay=0, slave_ready_latency=0, slave_response_latency=0,
|
|
disconnected_slaves=None, timeout=300, interconnect=AXILiteInterconnectShared,
|
|
**kwargs):
|
|
# number of masters/slaves is defined by the number of patterns/decoders
|
|
# master_patterns: list of patterns per master, pattern = list(tuple(rw, addr, data))
|
|
# slave_decoders: list of address decoders per slave
|
|
# delay/latency: control the speed of masters/slaves
|
|
# disconnected_slaves: list of slave numbers that shouldn't respond to any transactions
|
|
class DUT(Module):
|
|
def __init__(self, n_masters, decoders, **kwargs):
|
|
self.masters = [AXILiteInterface(name="master") for _ in range(n_masters)]
|
|
self.slaves = [AXILiteInterface(name="slave") for _ in range(len(decoders))]
|
|
slaves = list(zip(decoders, self.slaves))
|
|
self.submodules.interconnect = interconnect(self.masters, slaves, **kwargs)
|
|
|
|
class ReadDataGenerator:
|
|
# Generates data based on decoded addresses and data defined in master_patterns
|
|
def __init__(self, patterns):
|
|
self.mem = {}
|
|
for pattern in patterns:
|
|
for rw, addr, val in pattern:
|
|
if rw == "r":
|
|
assert addr not in self.mem
|
|
self.mem[addr] = val
|
|
|
|
def getter(self, n):
|
|
# on miss will give default data depending on slave n
|
|
return lambda addr: self.mem.get(addr, 0xbaad0000 + n)
|
|
|
|
def new_checker(rdata_generator):
|
|
return AXILiteChecker(ready_latency=slave_ready_latency,
|
|
response_latency=slave_response_latency,
|
|
rdata_generator=rdata_generator)
|
|
|
|
# perpare test
|
|
dut = DUT(len(master_patterns), slave_decoders, **kwargs)
|
|
rdata_generator = ReadDataGenerator(master_patterns)
|
|
checkers = [new_checker(rdata_generator.getter(i)) for i, _ in enumerate(master_patterns)]
|
|
pattern_generators = [AXILitePatternGenerator(dut.masters[i], pattern, delay=master_delay)
|
|
for i, pattern in enumerate(master_patterns)]
|
|
|
|
# run simulator
|
|
generators = [gen.handler() for gen in pattern_generators]
|
|
generators += [checker.handler(slave)
|
|
for i, (slave, checker) in enumerate(zip(dut.slaves, checkers))
|
|
if i not in (disconnected_slaves or [])]
|
|
generators += [timeout_generator(timeout)]
|
|
run_simulation(dut, generators)
|
|
|
|
return pattern_generators, checkers
|
|
|
|
def test_interconnect_shared_basic(self):
|
|
master_patterns = [
|
|
[("w", 0x000, 0), ("w", 0x101, 0), ("w", 0x202, 0)],
|
|
[("w", 0x010, 0), ("w", 0x111, 0), ("w", 0x112, 0)],
|
|
[("w", 0x220, 0), ("w", 0x221, 0), ("w", 0x222, 0)],
|
|
]
|
|
slave_decoders = [self.address_decoder(i) for i in range(3)]
|
|
|
|
generators, checkers = self.interconnect_test(master_patterns, slave_decoders,
|
|
master_delay=1)
|
|
|
|
for gen in generators:
|
|
self.assertEqual(gen.errors, 0)
|
|
|
|
def addr(checker_list):
|
|
return [entry[0] for entry in checker_list]
|
|
|
|
self.assertEqual(addr(checkers[0].writes), [0x000, 0x010])
|
|
self.assertEqual(addr(checkers[1].writes), [0x101, 0x111, 0x112])
|
|
self.assertEqual(addr(checkers[2].writes), [0x220, 0x221, 0x202, 0x222])
|
|
self.assertEqual(addr(checkers[0].reads), [])
|
|
self.assertEqual(addr(checkers[1].reads), [])
|
|
self.assertEqual(addr(checkers[2].reads), [])
|
|
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def interconnect_stress_test(self, timeout=1000, **kwargs):
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prng = random.Random(42)
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n_masters = 3
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n_slaves = 3
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pattern_length = 64
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slave_region_size = 0x10000000
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# for testing purpose each master will access only its own region of a slave
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master_region_size = 0x1000
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assert n_masters*master_region_size < slave_region_size
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def gen_pattern(n, length):
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assert length < master_region_size
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for i_access in range(length):
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rw = "w" if prng.randint(0, 1) == 0 else "r"
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i_slave = prng.randrange(n_slaves)
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addr = i_slave*slave_region_size + n*master_region_size + i_access
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data = addr
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yield rw, addr, data
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master_patterns = [list(gen_pattern(i, pattern_length)) for i in range(n_masters)]
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slave_decoders = [self.address_decoder(i, size=slave_region_size) for i in range(n_slaves)]
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slave_decoders_py = [self.address_decoder(i, size=slave_region_size, python=True)
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for i in range(n_slaves)]
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generators, checkers = self.interconnect_test(master_patterns, slave_decoders,
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timeout=timeout, **kwargs)
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for gen in generators:
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read_errors = [" 0x{:08x} vs 0x{:08x}".format(v, ref) for v, ref in gen.read_errors]
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msg = "\ngen.resp_errors = {}\ngen.read_errors = \n{}".format(
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gen.resp_errors, "\n".join(read_errors))
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if not kwargs.get("disconnected_slaves", None):
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self.assertEqual(gen.errors, 0, msg=msg)
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else: # when some slaves are disconnected we should have some errors
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self.assertNotEqual(gen.errors, 0, msg=msg)
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# make sure all the accesses at slave side are in correct address region
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for i_slave, (checker, decoder) in enumerate(zip(checkers, slave_decoders_py)):
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for addr in (entry[0] for entry in checker.writes + checker.reads):
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# compensate for the fact that decoders work on word-aligned addresses
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self.assertNotEqual(decoder(addr >> 2), 0)
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def test_interconnect_shared_stress_no_delay(self):
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self.interconnect_stress_test(timeout=1000,
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master_delay=0,
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slave_ready_latency=0,
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slave_response_latency=0)
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def test_interconnect_shared_stress_rand_short(self):
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prng = random.Random(42)
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rand = lambda: prng.randrange(4)
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self.interconnect_stress_test(timeout=2000,
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master_delay=rand,
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slave_ready_latency=rand,
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slave_response_latency=rand)
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def test_interconnect_shared_stress_rand_long(self):
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prng = random.Random(42)
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rand = lambda: prng.randrange(16)
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self.interconnect_stress_test(timeout=4000,
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master_delay=rand,
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slave_ready_latency=rand,
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slave_response_latency=rand)
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def test_interconnect_shared_stress_timeout(self):
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self.interconnect_stress_test(timeout=4000,
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disconnected_slaves=[1],
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timeout_cycles=50)
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def test_crossbar_stress_no_delay(self):
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self.interconnect_stress_test(timeout=1000,
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master_delay=0,
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slave_ready_latency=0,
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slave_response_latency=0,
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interconnect=AXILiteCrossbar)
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|
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def test_crossbar_stress_rand(self):
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prng = random.Random(42)
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rand = lambda: prng.randrange(4)
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self.interconnect_stress_test(timeout=2000,
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master_delay=rand,
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slave_ready_latency=rand,
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slave_response_latency=rand,
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interconnect=AXILiteCrossbar)
|