From: Jędrzej Boczar Date: Wed, 22 Jul 2020 14:59:17 +0000 (+0200) Subject: test/axi: move all AXI Lite tests to separate file X-Git-Tag: 24jan2021_ls180~64^2 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a9d8b81385ff81733118cd9c4f8caa4c7a492bf5;p=litex.git test/axi: move all AXI Lite tests to separate file --- diff --git a/test/test_axi.py b/test/test_axi.py index 0cfd2403..d1963df0 100644 --- a/test/test_axi.py +++ b/test/test_axi.py @@ -7,7 +7,7 @@ import random from migen import * from litex.soc.interconnect.axi import * -from litex.soc.interconnect import wishbone, csr_bus +from litex.soc.interconnect import wishbone # Software Models ---------------------------------------------------------------------------------- @@ -326,810 +326,3 @@ class TestAXI(unittest.TestCase): r_valid_random = 90, r_ready_random = 90 ) - -# TestAXILite -------------------------------------------------------------------------------------- - -def _int_or_call(int_or_func): - if callable(int_or_func): - return int_or_func() - return int_or_func - -class AXILiteChecker: - def __init__(self, ready_latency=0, response_latency=0, rdata_generator=None): - self.ready_latency = ready_latency - self.response_latency = response_latency - self.rdata_generator = rdata_generator or (lambda adr: 0xbaadc0de) - self.writes = [] # (addr, data, strb) - self.reads = [] # (addr, data) - - def delay(self, latency): - for _ in range(_int_or_call(latency)): - yield - - def handle_write(self, axi_lite): - # aw - while not (yield axi_lite.aw.valid): - yield - yield from self.delay(self.ready_latency) - addr = (yield axi_lite.aw.addr) - yield axi_lite.aw.ready.eq(1) - yield - yield axi_lite.aw.ready.eq(0) - while not (yield axi_lite.w.valid): - yield - yield from self.delay(self.ready_latency) - # w - data = (yield axi_lite.w.data) - strb = (yield axi_lite.w.strb) - yield axi_lite.w.ready.eq(1) - yield - yield axi_lite.w.ready.eq(0) - yield from self.delay(self.response_latency) - # b - yield axi_lite.b.valid.eq(1) - yield axi_lite.b.resp.eq(RESP_OKAY) - yield - while not (yield axi_lite.b.ready): - yield - yield axi_lite.b.valid.eq(0) - self.writes.append((addr, data, strb)) - - def handle_read(self, axi_lite): - # ar - while not (yield axi_lite.ar.valid): - yield - yield from self.delay(self.ready_latency) - addr = (yield axi_lite.ar.addr) - yield axi_lite.ar.ready.eq(1) - yield - yield axi_lite.ar.ready.eq(0) - yield from self.delay(self.response_latency) - # r - data = self.rdata_generator(addr) - yield axi_lite.r.valid.eq(1) - yield axi_lite.r.resp.eq(RESP_OKAY) - yield axi_lite.r.data.eq(data) - yield - while not (yield axi_lite.r.ready): - yield - yield axi_lite.r.valid.eq(0) - yield axi_lite.r.data.eq(0) - self.reads.append((addr, data)) - - @passive - def handler(self, axi_lite): - while True: - if (yield axi_lite.aw.valid): - yield from self.handle_write(axi_lite) - if (yield axi_lite.ar.valid): - yield from self.handle_read(axi_lite) - yield - -@passive -def timeout_generator(ticks): - import os - for i in range(ticks): - if os.environ.get("TIMEOUT_DEBUG", "") == "1": - print("tick {}".format(i)) - yield - raise TimeoutError("Timeout after %d ticks" % ticks) - -class TestAXILite(unittest.TestCase): - def test_wishbone2axi2wishbone(self): - class DUT(Module): - def __init__(self): - self.wishbone = wishbone.Interface(data_width=32) - - # # # - - axi = AXILiteInterface(data_width=32, address_width=32) - wb = wishbone.Interface(data_width=32) - - wishbone2axi = Wishbone2AXILite(self.wishbone, axi) - axi2wishbone = AXILite2Wishbone(axi, wb) - self.submodules += wishbone2axi, axi2wishbone - - sram = wishbone.SRAM(1024, init=[0x12345678, 0xa55aa55a]) - self.submodules += sram - self.comb += wb.connect(sram.bus) - - def generator(dut): - dut.errors = 0 - if (yield from dut.wishbone.read(0)) != 0x12345678: - dut.errors += 1 - if (yield from dut.wishbone.read(1)) != 0xa55aa55a: - dut.errors += 1 - for i in range(32): - yield from dut.wishbone.write(i, i) - for i in range(32): - if (yield from dut.wishbone.read(i)) != i: - dut.errors += 1 - - dut = DUT() - run_simulation(dut, [generator(dut)]) - self.assertEqual(dut.errors, 0) - - def test_axilite2csr(self): - @passive - def csr_mem_handler(csr, mem): - while True: - adr = (yield csr.adr) - yield csr.dat_r.eq(mem[adr]) - if (yield csr.we): - mem[adr] = (yield csr.dat_w) - yield - - class DUT(Module): - def __init__(self): - self.axi_lite = AXILiteInterface() - self.csr = csr_bus.Interface() - self.submodules.axilite2csr = AXILite2CSR(self.axi_lite, self.csr) - self.errors = 0 - - prng = random.Random(42) - mem_ref = [prng.randrange(255) for i in range(100)] - - def generator(dut): - dut.errors = 0 - - for adr, ref in enumerate(mem_ref): - adr = adr << 2 - data, resp = (yield from dut.axi_lite.read(adr)) - self.assertEqual(resp, 0b00) - if data != ref: - dut.errors += 1 - - write_data = [prng.randrange(255) for _ in mem_ref] - - for adr, wdata in enumerate(write_data): - adr = adr << 2 - resp = (yield from dut.axi_lite.write(adr, wdata)) - self.assertEqual(resp, 0b00) - rdata, resp = (yield from dut.axi_lite.read(adr)) - self.assertEqual(resp, 0b00) - if rdata != wdata: - dut.errors += 1 - - dut = DUT() - mem = [v for v in mem_ref] - run_simulation(dut, [generator(dut), csr_mem_handler(dut.csr, mem)]) - self.assertEqual(dut.errors, 0) - - def test_axilite_sram(self): - class DUT(Module): - def __init__(self, size, init): - self.axi_lite = AXILiteInterface() - self.submodules.sram = AXILiteSRAM(size, init=init, bus=self.axi_lite) - self.errors = 0 - - def generator(dut, ref_init): - for adr, ref in enumerate(ref_init): - adr = adr << 2 - data, resp = (yield from dut.axi_lite.read(adr)) - self.assertEqual(resp, 0b00) - if data != ref: - dut.errors += 1 - - write_data = [prng.randrange(255) for _ in ref_init] - - for adr, wdata in enumerate(write_data): - adr = adr << 2 - resp = (yield from dut.axi_lite.write(adr, wdata)) - self.assertEqual(resp, 0b00) - rdata, resp = (yield from dut.axi_lite.read(adr)) - self.assertEqual(resp, 0b00) - if rdata != wdata: - dut.errors += 1 - - prng = random.Random(42) - init = [prng.randrange(2**32) for i in range(100)] - - dut = DUT(size=len(init)*4, init=[v for v in init]) - run_simulation(dut, [generator(dut, init)]) - self.assertEqual(dut.errors, 0) - - def converter_test(self, width_from, width_to, - write_pattern=None, write_expected=None, - read_pattern=None, read_expected=None): - assert not (write_pattern is None and read_pattern is None) - - if write_pattern is None: - write_pattern = [] - write_expected = [] - elif len(write_pattern[0]) == 2: - # add w.strb - write_pattern = [(adr, data, 2**(width_from//8)-1) for adr, data in write_pattern] - - if read_pattern is None: - read_pattern = [] - read_expected = [] - - class DUT(Module): - def __init__(self, width_from, width_to): - self.master = AXILiteInterface(data_width=width_from) - self.slave = AXILiteInterface(data_width=width_to) - self.submodules.converter = AXILiteConverter(self.master, self.slave) - - def generator(axi_lite): - for addr, data, strb in write_pattern or []: - resp = (yield from axi_lite.write(addr, data, strb)) - self.assertEqual(resp, RESP_OKAY) - for _ in range(16): - yield - - for addr, refdata in read_pattern or []: - data, resp = (yield from axi_lite.read(addr)) - self.assertEqual(resp, RESP_OKAY) - self.assertEqual(data, refdata) - for _ in range(4): - yield - - def rdata_generator(adr): - for a, v in read_expected: - if a == adr: - return v - return 0xbaadc0de - - _latency = 0 - def latency(): - nonlocal _latency - _latency = (_latency + 1) % 3 - return _latency - - dut = DUT(width_from=width_from, width_to=width_to) - checker = AXILiteChecker(ready_latency=latency, rdata_generator=rdata_generator) - run_simulation(dut, [generator(dut.master), checker.handler(dut.slave)]) - self.assertEqual(checker.writes, write_expected) - self.assertEqual(checker.reads, read_expected) - - def test_axilite_down_converter_32to16(self): - write_pattern = [ - (0x00000000, 0x22221111), - (0x00000004, 0x44443333), - (0x00000008, 0x66665555), - (0x00000100, 0x88887777), - ] - write_expected = [ - (0x00000000, 0x1111, 0b11), - (0x00000002, 0x2222, 0b11), - (0x00000004, 0x3333, 0b11), - (0x00000006, 0x4444, 0b11), - (0x00000008, 0x5555, 0b11), - (0x0000000a, 0x6666, 0b11), - (0x00000100, 0x7777, 0b11), - (0x00000102, 0x8888, 0b11), - ] - read_pattern = write_pattern - read_expected = [(adr, data) for (adr, data, _) in write_expected] - self.converter_test(width_from=32, width_to=16, - write_pattern=write_pattern, write_expected=write_expected, - read_pattern=read_pattern, read_expected=read_expected) - - def test_axilite_down_converter_32to8(self): - write_pattern = [ - (0x00000000, 0x44332211), - (0x00000004, 0x88776655), - ] - write_expected = [ - (0x00000000, 0x11, 0b1), - (0x00000001, 0x22, 0b1), - (0x00000002, 0x33, 0b1), - (0x00000003, 0x44, 0b1), - (0x00000004, 0x55, 0b1), - (0x00000005, 0x66, 0b1), - (0x00000006, 0x77, 0b1), - (0x00000007, 0x88, 0b1), - ] - read_pattern = write_pattern - read_expected = [(adr, data) for (adr, data, _) in write_expected] - self.converter_test(width_from=32, width_to=8, - write_pattern=write_pattern, write_expected=write_expected, - read_pattern=read_pattern, read_expected=read_expected) - - def test_axilite_down_converter_64to32(self): - write_pattern = [ - (0x00000000, 0x2222222211111111), - (0x00000008, 0x4444444433333333), - ] - write_expected = [ - (0x00000000, 0x11111111, 0b1111), - (0x00000004, 0x22222222, 0b1111), - (0x00000008, 0x33333333, 0b1111), - (0x0000000c, 0x44444444, 0b1111), - ] - read_pattern = write_pattern - read_expected = [(adr, data) for (adr, data, _) in write_expected] - self.converter_test(width_from=64, width_to=32, - write_pattern=write_pattern, write_expected=write_expected, - read_pattern=read_pattern, read_expected=read_expected) - - def test_axilite_down_converter_strb(self): - write_pattern = [ - (0x00000000, 0x22221111, 0b1100), - (0x00000004, 0x44443333, 0b1111), - (0x00000008, 0x66665555, 0b1011), - (0x00000100, 0x88887777, 0b0011), - ] - write_expected = [ - (0x00000002, 0x2222, 0b11), - (0x00000004, 0x3333, 0b11), - (0x00000006, 0x4444, 0b11), - (0x00000008, 0x5555, 0b11), - (0x0000000a, 0x6666, 0b10), - (0x00000100, 0x7777, 0b11), - ] - self.converter_test(width_from=32, width_to=16, - write_pattern=write_pattern, write_expected=write_expected) - -# TestAXILiteInterconnet --------------------------------------------------------------------------- - -class AXILitePatternGenerator: - def __init__(self, axi_lite, pattern, delay=0): - self.axi_lite = axi_lite - self.pattern = pattern - self.delay = delay - self.errors = 0 - self.read_errors = [] - self.resp_errors = {"w": 0, "r": 0} - - def handler(self): - for rw, addr, data in self.pattern: - assert rw in ["w", "r"] - if rw == "w": - strb = 2**len(self.axi_lite.w.strb) - 1 - resp = (yield from self.axi_lite.write(addr, data, strb)) - else: - rdata, resp = (yield from self.axi_lite.read(addr)) - if rdata != data: - self.read_errors.append((rdata, data)) - self.errors += 1 - if resp != RESP_OKAY: - self.resp_errors[rw] += 1 - self.errors += 1 - for _ in range(_int_or_call(self.delay)): - yield - for _ in range(16): - yield - -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, vcd_name='sim.vcd') - - 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), []) - - def interconnect_stress_test(self, timeout=1000, **kwargs): - prng = random.Random(42) - - n_masters = 3 - n_slaves = 3 - pattern_length = 64 - slave_region_size = 0x10000000 - # for testing purpose each master will access only its own region of a slave - master_region_size = 0x1000 - assert n_masters*master_region_size < slave_region_size - - def gen_pattern(n, length): - assert length < master_region_size - for i_access in range(length): - rw = "w" if prng.randint(0, 1) == 0 else "r" - i_slave = prng.randrange(n_slaves) - addr = i_slave*slave_region_size + n*master_region_size + i_access - data = addr - yield rw, addr, data - - master_patterns = [list(gen_pattern(i, pattern_length)) for i in range(n_masters)] - slave_decoders = [self.address_decoder(i, size=slave_region_size) for i in range(n_slaves)] - slave_decoders_py = [self.address_decoder(i, size=slave_region_size, python=True) - for i in range(n_slaves)] - - generators, checkers = self.interconnect_test(master_patterns, slave_decoders, - timeout=timeout, **kwargs) - - for gen in generators: - read_errors = [" 0x{:08x} vs 0x{:08x}".format(v, ref) for v, ref in gen.read_errors] - msg = "\ngen.resp_errors = {}\ngen.read_errors = \n{}".format( - gen.resp_errors, "\n".join(read_errors)) - if not kwargs.get("disconnected_slaves", None): - self.assertEqual(gen.errors, 0, msg=msg) - else: # when some slaves are disconnected we should have some errors - self.assertNotEqual(gen.errors, 0, msg=msg) - - # make sure all the accesses at slave side are in correct address region - for i_slave, (checker, decoder) in enumerate(zip(checkers, slave_decoders_py)): - for addr in (entry[0] for entry in checker.writes + checker.reads): - # compensate for the fact that decoders work on word-aligned addresses - self.assertNotEqual(decoder(addr >> 2), 0) - - def test_interconnect_shared_stress_no_delay(self): - self.interconnect_stress_test(timeout=1000, - master_delay=0, - slave_ready_latency=0, - slave_response_latency=0) - - def test_interconnect_shared_stress_rand_short(self): - prng = random.Random(42) - rand = lambda: prng.randrange(4) - self.interconnect_stress_test(timeout=2000, - master_delay=rand, - slave_ready_latency=rand, - slave_response_latency=rand) - - def test_interconnect_shared_stress_rand_long(self): - prng = random.Random(42) - rand = lambda: prng.randrange(16) - self.interconnect_stress_test(timeout=4000, - master_delay=rand, - slave_ready_latency=rand, - slave_response_latency=rand) - - def test_interconnect_shared_stress_timeout(self): - self.interconnect_stress_test(timeout=4000, - disconnected_slaves=[1], - timeout_cycles=50) - - def test_crossbar_stress_no_delay(self): - self.interconnect_stress_test(timeout=1000, - master_delay=0, - slave_ready_latency=0, - slave_response_latency=0, - interconnect=AXILiteCrossbar) - - def test_crossbar_stress_rand(self): - prng = random.Random(42) - rand = lambda: prng.randrange(4) - self.interconnect_stress_test(timeout=2000, - master_delay=rand, - slave_ready_latency=rand, - slave_response_latency=rand, - interconnect=AXILiteCrossbar) diff --git a/test/test_axi_lite.py b/test/test_axi_lite.py new file mode 100644 index 00000000..f48b0440 --- /dev/null +++ b/test/test_axi_lite.py @@ -0,0 +1,820 @@ +# This file is Copyright (c) 2020 Antmicro +# License: BSD + +import unittest +import random + +from migen import * + +from litex.soc.interconnect.axi import * +from litex.soc.interconnect import wishbone, csr_bus + +# Helpers ------------------------------------------------------------------------------------------ + +def _int_or_call(int_or_func): + if callable(int_or_func): + return int_or_func() + return int_or_func + +@passive +def timeout_generator(ticks): + import os + for i in range(ticks): + if os.environ.get("TIMEOUT_DEBUG", "") == "1": + print("tick {}".format(i)) + yield + raise TimeoutError("Timeout after %d ticks" % ticks) + +class AXILiteChecker: + def __init__(self, ready_latency=0, response_latency=0, rdata_generator=None): + self.ready_latency = ready_latency + self.response_latency = response_latency + self.rdata_generator = rdata_generator or (lambda adr: 0xbaadc0de) + self.writes = [] # (addr, data, strb) + self.reads = [] # (addr, data) + + def delay(self, latency): + for _ in range(_int_or_call(latency)): + yield + + def handle_write(self, axi_lite): + # aw + while not (yield axi_lite.aw.valid): + yield + yield from self.delay(self.ready_latency) + addr = (yield axi_lite.aw.addr) + yield axi_lite.aw.ready.eq(1) + yield + yield axi_lite.aw.ready.eq(0) + while not (yield axi_lite.w.valid): + yield + yield from self.delay(self.ready_latency) + # w + data = (yield axi_lite.w.data) + strb = (yield axi_lite.w.strb) + yield axi_lite.w.ready.eq(1) + yield + yield axi_lite.w.ready.eq(0) + yield from self.delay(self.response_latency) + # b + yield axi_lite.b.valid.eq(1) + yield axi_lite.b.resp.eq(RESP_OKAY) + yield + while not (yield axi_lite.b.ready): + yield + yield axi_lite.b.valid.eq(0) + self.writes.append((addr, data, strb)) + + def handle_read(self, axi_lite): + # ar + while not (yield axi_lite.ar.valid): + yield + yield from self.delay(self.ready_latency) + addr = (yield axi_lite.ar.addr) + yield axi_lite.ar.ready.eq(1) + yield + yield axi_lite.ar.ready.eq(0) + yield from self.delay(self.response_latency) + # r + data = self.rdata_generator(addr) + yield axi_lite.r.valid.eq(1) + yield axi_lite.r.resp.eq(RESP_OKAY) + yield axi_lite.r.data.eq(data) + yield + while not (yield axi_lite.r.ready): + yield + yield axi_lite.r.valid.eq(0) + yield axi_lite.r.data.eq(0) + self.reads.append((addr, data)) + + @passive + def handler(self, axi_lite): + while True: + if (yield axi_lite.aw.valid): + yield from self.handle_write(axi_lite) + if (yield axi_lite.ar.valid): + yield from self.handle_read(axi_lite) + yield + +class AXILitePatternGenerator: + def __init__(self, axi_lite, pattern, delay=0): + # patter: (rw, addr, data) + self.axi_lite = axi_lite + self.pattern = pattern + self.delay = delay + self.errors = 0 + self.read_errors = [] + self.resp_errors = {"w": 0, "r": 0} + + def handler(self): + for rw, addr, data in self.pattern: + assert rw in ["w", "r"] + if rw == "w": + strb = 2**len(self.axi_lite.w.strb) - 1 + resp = (yield from self.axi_lite.write(addr, data, strb)) + else: + rdata, resp = (yield from self.axi_lite.read(addr)) + if rdata != data: + self.read_errors.append((rdata, data)) + self.errors += 1 + if resp != RESP_OKAY: + self.resp_errors[rw] += 1 + self.errors += 1 + for _ in range(_int_or_call(self.delay)): + yield + for _ in range(16): + yield + +# TestAXILite -------------------------------------------------------------------------------------- + +class TestAXILite(unittest.TestCase): + def test_wishbone2axi2wishbone(self): + class DUT(Module): + def __init__(self): + self.wishbone = wishbone.Interface(data_width=32) + + # # # + + axi = AXILiteInterface(data_width=32, address_width=32) + wb = wishbone.Interface(data_width=32) + + wishbone2axi = Wishbone2AXILite(self.wishbone, axi) + axi2wishbone = AXILite2Wishbone(axi, wb) + self.submodules += wishbone2axi, axi2wishbone + + sram = wishbone.SRAM(1024, init=[0x12345678, 0xa55aa55a]) + self.submodules += sram + self.comb += wb.connect(sram.bus) + + def generator(dut): + dut.errors = 0 + if (yield from dut.wishbone.read(0)) != 0x12345678: + dut.errors += 1 + if (yield from dut.wishbone.read(1)) != 0xa55aa55a: + dut.errors += 1 + for i in range(32): + yield from dut.wishbone.write(i, i) + for i in range(32): + if (yield from dut.wishbone.read(i)) != i: + dut.errors += 1 + + dut = DUT() + run_simulation(dut, [generator(dut)]) + self.assertEqual(dut.errors, 0) + + def test_axilite2csr(self): + @passive + def csr_mem_handler(csr, mem): + while True: + adr = (yield csr.adr) + yield csr.dat_r.eq(mem[adr]) + if (yield csr.we): + mem[adr] = (yield csr.dat_w) + yield + + class DUT(Module): + def __init__(self): + self.axi_lite = AXILiteInterface() + self.csr = csr_bus.Interface() + self.submodules.axilite2csr = AXILite2CSR(self.axi_lite, self.csr) + self.errors = 0 + + prng = random.Random(42) + mem_ref = [prng.randrange(255) for i in range(100)] + + def generator(dut): + dut.errors = 0 + + for adr, ref in enumerate(mem_ref): + adr = adr << 2 + data, resp = (yield from dut.axi_lite.read(adr)) + self.assertEqual(resp, 0b00) + if data != ref: + dut.errors += 1 + + write_data = [prng.randrange(255) for _ in mem_ref] + + for adr, wdata in enumerate(write_data): + adr = adr << 2 + resp = (yield from dut.axi_lite.write(adr, wdata)) + self.assertEqual(resp, 0b00) + rdata, resp = (yield from dut.axi_lite.read(adr)) + self.assertEqual(resp, 0b00) + if rdata != wdata: + dut.errors += 1 + + dut = DUT() + mem = [v for v in mem_ref] + run_simulation(dut, [generator(dut), csr_mem_handler(dut.csr, mem)]) + self.assertEqual(dut.errors, 0) + + def test_axilite_sram(self): + class DUT(Module): + def __init__(self, size, init): + self.axi_lite = AXILiteInterface() + self.submodules.sram = AXILiteSRAM(size, init=init, bus=self.axi_lite) + self.errors = 0 + + def generator(dut, ref_init): + for adr, ref in enumerate(ref_init): + adr = adr << 2 + data, resp = (yield from dut.axi_lite.read(adr)) + self.assertEqual(resp, 0b00) + if data != ref: + dut.errors += 1 + + write_data = [prng.randrange(255) for _ in ref_init] + + for adr, wdata in enumerate(write_data): + adr = adr << 2 + resp = (yield from dut.axi_lite.write(adr, wdata)) + self.assertEqual(resp, 0b00) + rdata, resp = (yield from dut.axi_lite.read(adr)) + self.assertEqual(resp, 0b00) + if rdata != wdata: + dut.errors += 1 + + prng = random.Random(42) + init = [prng.randrange(2**32) for i in range(100)] + + dut = DUT(size=len(init)*4, init=[v for v in init]) + run_simulation(dut, [generator(dut, init)]) + self.assertEqual(dut.errors, 0) + + def converter_test(self, width_from, width_to, + write_pattern=None, write_expected=None, + read_pattern=None, read_expected=None): + assert not (write_pattern is None and read_pattern is None) + + if write_pattern is None: + write_pattern = [] + write_expected = [] + elif len(write_pattern[0]) == 2: + # add w.strb + write_pattern = [(adr, data, 2**(width_from//8)-1) for adr, data in write_pattern] + + if read_pattern is None: + read_pattern = [] + read_expected = [] + + class DUT(Module): + def __init__(self, width_from, width_to): + self.master = AXILiteInterface(data_width=width_from) + self.slave = AXILiteInterface(data_width=width_to) + self.submodules.converter = AXILiteConverter(self.master, self.slave) + + def generator(axi_lite): + for addr, data, strb in write_pattern or []: + resp = (yield from axi_lite.write(addr, data, strb)) + self.assertEqual(resp, RESP_OKAY) + for _ in range(16): + yield + + for addr, refdata in read_pattern or []: + data, resp = (yield from axi_lite.read(addr)) + self.assertEqual(resp, RESP_OKAY) + self.assertEqual(data, refdata) + for _ in range(4): + yield + + def rdata_generator(adr): + for a, v in read_expected: + if a == adr: + return v + return 0xbaadc0de + + _latency = 0 + def latency(): + nonlocal _latency + _latency = (_latency + 1) % 3 + return _latency + + dut = DUT(width_from=width_from, width_to=width_to) + checker = AXILiteChecker(ready_latency=latency, rdata_generator=rdata_generator) + run_simulation(dut, [generator(dut.master), checker.handler(dut.slave)]) + self.assertEqual(checker.writes, write_expected) + self.assertEqual(checker.reads, read_expected) + + def test_axilite_down_converter_32to16(self): + write_pattern = [ + (0x00000000, 0x22221111), + (0x00000004, 0x44443333), + (0x00000008, 0x66665555), + (0x00000100, 0x88887777), + ] + write_expected = [ + (0x00000000, 0x1111, 0b11), + (0x00000002, 0x2222, 0b11), + (0x00000004, 0x3333, 0b11), + (0x00000006, 0x4444, 0b11), + (0x00000008, 0x5555, 0b11), + (0x0000000a, 0x6666, 0b11), + (0x00000100, 0x7777, 0b11), + (0x00000102, 0x8888, 0b11), + ] + read_pattern = write_pattern + read_expected = [(adr, data) for (adr, data, _) in write_expected] + self.converter_test(width_from=32, width_to=16, + write_pattern=write_pattern, write_expected=write_expected, + read_pattern=read_pattern, read_expected=read_expected) + + def test_axilite_down_converter_32to8(self): + write_pattern = [ + (0x00000000, 0x44332211), + (0x00000004, 0x88776655), + ] + write_expected = [ + (0x00000000, 0x11, 0b1), + (0x00000001, 0x22, 0b1), + (0x00000002, 0x33, 0b1), + (0x00000003, 0x44, 0b1), + (0x00000004, 0x55, 0b1), + (0x00000005, 0x66, 0b1), + (0x00000006, 0x77, 0b1), + (0x00000007, 0x88, 0b1), + ] + read_pattern = write_pattern + read_expected = [(adr, data) for (adr, data, _) in write_expected] + self.converter_test(width_from=32, width_to=8, + write_pattern=write_pattern, write_expected=write_expected, + read_pattern=read_pattern, read_expected=read_expected) + + def test_axilite_down_converter_64to32(self): + write_pattern = [ + (0x00000000, 0x2222222211111111), + (0x00000008, 0x4444444433333333), + ] + write_expected = [ + (0x00000000, 0x11111111, 0b1111), + (0x00000004, 0x22222222, 0b1111), + (0x00000008, 0x33333333, 0b1111), + (0x0000000c, 0x44444444, 0b1111), + ] + read_pattern = write_pattern + read_expected = [(adr, data) for (adr, data, _) in write_expected] + self.converter_test(width_from=64, width_to=32, + write_pattern=write_pattern, write_expected=write_expected, + read_pattern=read_pattern, read_expected=read_expected) + + def test_axilite_down_converter_strb(self): + write_pattern = [ + (0x00000000, 0x22221111, 0b1100), + (0x00000004, 0x44443333, 0b1111), + (0x00000008, 0x66665555, 0b1011), + (0x00000100, 0x88887777, 0b0011), + ] + write_expected = [ + (0x00000002, 0x2222, 0b11), + (0x00000004, 0x3333, 0b11), + (0x00000006, 0x4444, 0b11), + (0x00000008, 0x5555, 0b11), + (0x0000000a, 0x6666, 0b10), + (0x00000100, 0x7777, 0b11), + ] + self.converter_test(width_from=32, width_to=16, + 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, vcd_name='sim.vcd') + + 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), []) + + def interconnect_stress_test(self, timeout=1000, **kwargs): + prng = random.Random(42) + + n_masters = 3 + n_slaves = 3 + pattern_length = 64 + slave_region_size = 0x10000000 + # for testing purpose each master will access only its own region of a slave + master_region_size = 0x1000 + assert n_masters*master_region_size < slave_region_size + + def gen_pattern(n, length): + assert length < master_region_size + for i_access in range(length): + rw = "w" if prng.randint(0, 1) == 0 else "r" + i_slave = prng.randrange(n_slaves) + addr = i_slave*slave_region_size + n*master_region_size + i_access + data = addr + yield rw, addr, data + + master_patterns = [list(gen_pattern(i, pattern_length)) for i in range(n_masters)] + slave_decoders = [self.address_decoder(i, size=slave_region_size) for i in range(n_slaves)] + slave_decoders_py = [self.address_decoder(i, size=slave_region_size, python=True) + for i in range(n_slaves)] + + generators, checkers = self.interconnect_test(master_patterns, slave_decoders, + timeout=timeout, **kwargs) + + for gen in generators: + read_errors = [" 0x{:08x} vs 0x{:08x}".format(v, ref) for v, ref in gen.read_errors] + msg = "\ngen.resp_errors = {}\ngen.read_errors = \n{}".format( + gen.resp_errors, "\n".join(read_errors)) + if not kwargs.get("disconnected_slaves", None): + self.assertEqual(gen.errors, 0, msg=msg) + else: # when some slaves are disconnected we should have some errors + self.assertNotEqual(gen.errors, 0, msg=msg) + + # make sure all the accesses at slave side are in correct address region + for i_slave, (checker, decoder) in enumerate(zip(checkers, slave_decoders_py)): + for addr in (entry[0] for entry in checker.writes + checker.reads): + # compensate for the fact that decoders work on word-aligned addresses + self.assertNotEqual(decoder(addr >> 2), 0) + + def test_interconnect_shared_stress_no_delay(self): + self.interconnect_stress_test(timeout=1000, + master_delay=0, + slave_ready_latency=0, + slave_response_latency=0) + + def test_interconnect_shared_stress_rand_short(self): + prng = random.Random(42) + rand = lambda: prng.randrange(4) + self.interconnect_stress_test(timeout=2000, + master_delay=rand, + slave_ready_latency=rand, + slave_response_latency=rand) + + def test_interconnect_shared_stress_rand_long(self): + prng = random.Random(42) + rand = lambda: prng.randrange(16) + self.interconnect_stress_test(timeout=4000, + master_delay=rand, + slave_ready_latency=rand, + slave_response_latency=rand) + + def test_interconnect_shared_stress_timeout(self): + self.interconnect_stress_test(timeout=4000, + disconnected_slaves=[1], + timeout_cycles=50) + + def test_crossbar_stress_no_delay(self): + self.interconnect_stress_test(timeout=1000, + master_delay=0, + slave_ready_latency=0, + slave_response_latency=0, + interconnect=AXILiteCrossbar) + + def test_crossbar_stress_rand(self): + prng = random.Random(42) + rand = lambda: prng.randrange(4) + self.interconnect_stress_test(timeout=2000, + master_delay=rand, + slave_ready_latency=rand, + slave_response_latency=rand, + interconnect=AXILiteCrossbar)