src/soc/experiment/test/test_loadstore1.py

   1 from nmigen import (C, Module, Signal, Elaboratable, Mux, Cat, Repl, Signal,
   2                     Const)
   3 from nmigen.cli import main
   4 from nmigen.cli import rtlil
   5 from nmutil.mask import Mask, masked
   6 from nmutil.util import Display
   7 from random import randint, seed
   8 from nmigen.sim import Simulator, Delay, Settle
   9 from nmutil.util import wrap
  10
  11 from soc.config.test.test_pi2ls import (pi_ld, pi_st, pi_ldst, wait_busy,
  12                                         get_exception_info)
  13 #from soc.config.test.test_pi2ls import pi_st_debug
  14 from soc.config.test.test_loadstore import TestMemPspec
  15 from soc.config.loadstore import ConfigMemoryPortInterface
  16
  17 from soc.fu.ldst.loadstore import LoadStore1
  18 from soc.experiment.mmu import MMU
  19 from soc.experiment.test import pagetables
  20
  21 from nmigen.compat.sim import run_simulation
  22 from random import random
  23 from openpower.test.wb_get import wb_get
  24 from openpower.test import wb_get as wbget
  25
  26
  27 def setup_mmu():
  28
  29     wbget.stop = False
  30
  31     pspec = TestMemPspec(ldst_ifacetype='mmu_cache_wb',
  32                          imem_ifacetype='',
  33                          addr_wid=48,
  34                          #disable_cache=True, # hmmm...
  35                          mask_wid=8,
  36                          reg_wid=64)
  37
  38     m = Module()
  39     comb = m.d.comb
  40     cmpi = ConfigMemoryPortInterface(pspec)
  41     m.submodules.ldst = ldst = cmpi.pi
  42     m.submodules.mmu = mmu = MMU()
  43     dcache = ldst.dcache
  44     icache = ldst.icache
  45
  46     l_in, l_out = mmu.l_in, mmu.l_out
  47     d_in, d_out = dcache.d_in, dcache.d_out
  48     i_in, i_out = icache.i_in, icache.i_out # FetchToICache, ICacheToDecode
  49
  50     # link mmu, dcache and icache together
  51     m.d.comb += dcache.m_in.eq(mmu.d_out) # MMUToDCacheType
  52     m.d.comb += icache.m_in.eq(mmu.i_out) # MMUToICacheType
  53     m.d.comb += mmu.d_in.eq(dcache.m_out) # DCacheToMMUType
  54
  55     # link ldst and MMU together
  56     comb += l_in.eq(ldst.m_out)
  57     comb += ldst.m_in.eq(l_out)
  58
  59     return m, cmpi
  60
  61
  62 test_exceptions = True
  63 test_dcbz = True
  64 test_random = True
  65
  66
  67 def _test_loadstore1_ifetch(dut, mem):
  68     """test_loadstore1_ifetch
  69
  70     this is quite a complex multi-step test.
  71
  72     * first (just because, as a demo) read in priv mode, non-virtual.
  73       just like in experiment/icache.py itself.
  74
  75     * second, using the (usual) PTE for these things (which came originally
  76       from gem5-experimental experiment/radix_walk_example.txt) do a
  77       virtual-memory read through the *instruction* cache.
  78       this is expected to FAIL
  79
  80     * third: mess about with the MMU, setting "iside" (instruction-side),
  81       requesting an MMU RADIX LOOKUP.  this triggers an itlb_load
  82       (instruction-cache TLB entry-insertion)
  83
  84     * fourth and finally: retry the read of the instruction through i-cache.
  85       this is now expected to SUCCEED
  86
  87     a lot going on.
  88     """
  89
  90     mmu = dut.submodules.mmu
  91     ldst = dut.submodules.ldst
  92     pi = ldst.pi
  93     icache = dut.submodules.ldst.icache
  94     wbget.stop = False
  95
  96     print("=== test loadstore instruction (real) ===")
  97
  98     i_in = icache.i_in
  99     i_out  = icache.i_out
 100     i_m_in = icache.m_in
 101
 102     # first virtual memory test
 103
 104     print ("set process table")
 105     yield mmu.rin.prtbl.eq(0x1000000) # set process table
 106     yield
 107
 108     # set address to zero, update mem[0] to 01234
 109     addr = 8
 110     expected_insn = 0x1234
 111     mem[addr] = expected_insn
 112
 113     yield i_in.priv_mode.eq(1)
 114     yield i_in.req.eq(0)
 115     yield i_in.nia.eq(addr)
 116     yield i_in.stop_mark.eq(0)
 117     yield i_m_in.tlbld.eq(0)
 118     yield i_m_in.tlbie.eq(0)
 119     yield i_m_in.addr.eq(0)
 120     yield i_m_in.pte.eq(0)
 121     yield
 122     yield
 123     yield
 124
 125     # miss, stalls for a bit
 126     yield i_in.req.eq(1)
 127     yield i_in.nia.eq(addr)
 128     yield
 129     valid = yield i_out.valid
 130     while not valid:
 131         yield
 132         valid = yield i_out.valid
 133     yield i_in.req.eq(0)
 134
 135     nia   = yield i_out.nia
 136     insn  = yield i_out.insn
 137     yield
 138     yield
 139
 140     print ("fetched %x from addr %x" % (insn, nia))
 141     assert insn == expected_insn
 142
 143     print("=== test loadstore instruction (virtual) ===")
 144
 145     # look up i-cache expecting it to fail
 146
 147     # set address to 0x10200, update mem[] to 5678
 148     virt_addr = 0x10200
 149     real_addr = virt_addr
 150     expected_insn = 0x5678
 151     mem[real_addr] = expected_insn
 152
 153     yield i_in.priv_mode.eq(0)
 154     yield i_in.virt_mode.eq(1)
 155     yield i_in.req.eq(0)
 156     yield i_in.nia.eq(virt_addr)
 157     yield i_in.stop_mark.eq(0)
 158     yield i_m_in.tlbld.eq(0)
 159     yield i_m_in.tlbie.eq(0)
 160     yield i_m_in.addr.eq(0)
 161     yield i_m_in.pte.eq(0)
 162     yield
 163     yield
 164     yield
 165
 166     # miss, stalls for a bit
 167     yield i_in.req.eq(1)
 168     yield i_in.nia.eq(virt_addr)
 169     yield
 170     valid = yield i_out.valid
 171     failed = yield i_out.fetch_failed
 172     while not valid and not failed:
 173         yield
 174         valid = yield i_out.valid
 175         failed = yield i_out.fetch_failed
 176     yield i_in.req.eq(0)
 177
 178     print ("failed?", "yes" if failed else "no")
 179     assert failed == 1
 180     yield
 181     yield
 182
 183     print("=== test loadstore instruction (instruction fault) ===")
 184
 185     virt_addr = 0x10200
 186
 187     yield ldst.priv_mode.eq(0)
 188     yield ldst.instr_fault.eq(1)
 189     yield ldst.maddr.eq(virt_addr)
 190     #ld_data, exctype, exc = yield from pi_ld(pi, virt_addr, 8, msr_pr=1)
 191     yield
 192     yield ldst.instr_fault.eq(0)
 193     while True:
 194         done = yield (ldst.done)
 195         exc_info = yield from get_exception_info(pi.exc_o)
 196         if done or exc_info.happened:
 197             break
 198         yield
 199     assert exc_info.happened == 0 # assert just before doing the fault set zero
 200     yield ldst.instr_fault.eq(0)
 201     yield
 202     yield
 203     yield
 204
 205     print("=== test loadstore instruction (try instruction again) ===")
 206     # set address to 0x10200, update mem[] to 5678
 207     virt_addr = 0x10200
 208     real_addr = virt_addr
 209     expected_insn = 0x5678
 210
 211     yield i_in.priv_mode.eq(0)
 212     yield i_in.virt_mode.eq(1)
 213     yield i_in.req.eq(0)
 214     yield i_in.nia.eq(virt_addr)
 215     yield i_in.stop_mark.eq(0)
 216     yield i_m_in.tlbld.eq(0)
 217     yield i_m_in.tlbie.eq(0)
 218     yield i_m_in.addr.eq(0)
 219     yield i_m_in.pte.eq(0)
 220     yield
 221     yield
 222     yield
 223
 224     # miss, stalls for a bit
 225     yield i_in.req.eq(1)
 226     yield i_in.nia.eq(virt_addr)
 227     yield
 228     valid = yield i_out.valid
 229     failed = yield i_out.fetch_failed
 230     while not valid and not failed:
 231         yield
 232         valid = yield i_out.valid
 233         failed = yield i_out.fetch_failed
 234     yield i_in.req.eq(0)
 235     nia   = yield i_out.nia
 236     insn  = yield i_out.insn
 237     yield
 238     yield
 239
 240     print ("failed?", "yes" if failed else "no")
 241     assert failed == 0
 242
 243     print ("fetched %x from addr %x" % (insn, nia))
 244     assert insn == expected_insn
 245
 246     wbget.stop = True
 247
 248
 249 def _test_loadstore1_invalid(dut, mem):
 250     mmu = dut.submodules.mmu
 251     pi = dut.submodules.ldst.pi
 252     wbget.stop = False
 253
 254     print("=== test invalid ===")
 255
 256     addr = 0
 257     ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 258     print("ld_data", ld_data, exctype, exc)
 259     assert (exctype == "slow")
 260     invalid = exc.invalid
 261     assert (invalid == 1)
 262
 263     print("=== test invalid done ===")
 264
 265     wbget.stop = True
 266
 267
 268 def _test_loadstore1(dut, mem):
 269     mmu = dut.submodules.mmu
 270     pi = dut.submodules.ldst.pi
 271     ldst = dut.submodules.ldst # to get at DAR (NOT part of PortInterface)
 272     wbget.stop = False
 273
 274     yield mmu.rin.prtbl.eq(0x1000000) # set process table
 275     yield
 276
 277     addr = 0x100e0
 278     data = 0xf553b658ba7e1f51
 279
 280     if test_dcbz:
 281         yield from pi_st(pi, addr, data, 8, msr_pr=1)
 282         yield
 283
 284         ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 285         assert ld_data == 0xf553b658ba7e1f51
 286         assert exctype is None
 287
 288         ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 289         assert ld_data == 0xf553b658ba7e1f51
 290         assert exctype is None
 291
 292         print("do_dcbz ===============")
 293         yield from pi_st(pi, addr, data, 8, msr_pr=1, is_dcbz=1)
 294         print("done_dcbz ===============")
 295         yield
 296
 297         ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 298         print("ld_data after dcbz")
 299         print(ld_data)
 300         assert ld_data == 0
 301         assert exctype is None
 302
 303     if test_exceptions:
 304         print("=== alignment error (ld) ===")
 305         addr = 0xFF100e0FF
 306         ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 307         if exc:
 308             alignment = exc.alignment
 309             happened = exc.happened
 310             yield # wait for dsr to update
 311             dar = yield ldst.dar
 312         else:
 313             alignment = 0
 314             happened = 0
 315             dar = 0
 316         assert (happened == 1)
 317         assert (alignment == 1)
 318         assert (dar == addr)
 319         assert (exctype == "fast")
 320         yield from wait_busy(pi, debug="pi_ld_E_alignment_error")
 321         # wait is only needed in case of in exception here
 322         print("=== alignment error test passed (ld) ===")
 323
 324         # take some cycles in between so that gtkwave separates out
 325         # signals
 326         yield
 327         yield
 328         yield
 329         yield
 330
 331         print("=== alignment error (st) ===")
 332         addr = 0xFF100e0FF
 333         exctype, exc = yield from pi_st(pi, addr,0, 8, msr_pr=1)
 334         if exc:
 335             alignment = exc.alignment
 336             happened = exc.happened
 337         else:
 338             alignment = 0
 339             happened = 0
 340         assert (happened == 1)
 341         assert (alignment==1)
 342         assert (dar==addr)
 343         assert (exctype == "fast")
 344         #???? yield from wait_busy(pi, debug="pi_st_E_alignment_error")
 345         # wait is only needed in case of in exception here
 346         print("=== alignment error test passed (st) ===")
 347         yield #FIXME hangs
 348
 349     if True:
 350         print("=== no alignment error (ld) ===")
 351         addr = 0x100e0
 352         ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 353         print("ld_data", ld_data, exctype, exc)
 354         if exc:
 355             alignment = exc.alignment
 356             happened = exc.happened
 357         else:
 358             alignment = 0
 359             happened = 0
 360         assert (happened == 0)
 361         assert (alignment == 0)
 362         print("=== no alignment error done (ld) ===")
 363
 364     if test_random:
 365         addrs = [0x456920,0xa7a180,0x299420,0x1d9d60]
 366
 367         for addr in addrs:
 368             print("== RANDOM addr ==",hex(addr))
 369             ld_data, exctype, exc  = yield from pi_ld(pi, addr, 8, msr_pr=1)
 370             print("ld_data[RANDOM]",ld_data,exc,addr)
 371             assert (exctype == None)
 372
 373         for addr in addrs:
 374             print("== RANDOM addr ==",hex(addr))
 375             exc = yield from pi_st(pi, addr,0xFF*addr, 8, msr_pr=1)
 376             assert (exctype == None)
 377
 378         # readback written data and compare
 379         for addr in addrs:
 380             print("== RANDOM addr ==",hex(addr))
 381             ld_data, exctype, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 382             print("ld_data[RANDOM_READBACK]",ld_data,exc,addr)
 383             assert (exctype == None)
 384             assert (ld_data == 0xFF*addr)
 385
 386         print("== RANDOM addr done ==")
 387
 388     wbget.stop = True
 389
 390
 391 def _test_loadstore1_ifetch_invalid(dut, mem):
 392     mmu = dut.submodules.mmu
 393     ldst = dut.submodules.ldst
 394     pi = ldst.pi
 395     icache = dut.submodules.ldst.icache
 396     wbget.stop = False
 397
 398     print("=== test loadstore instruction (invalid) ===")
 399
 400     i_in = icache.i_in
 401     i_out  = icache.i_out
 402     i_m_in = icache.m_in
 403
 404     # first virtual memory test
 405
 406     print ("set process table")
 407     yield mmu.rin.prtbl.eq(0x1000000) # set process table
 408     yield
 409
 410     # set address to zero, update mem[0] to 01234
 411     addr = 8
 412     expected_insn = 0x1234
 413     mem[addr] = expected_insn
 414
 415     yield i_in.priv_mode.eq(1)
 416     yield i_in.req.eq(0)
 417     yield i_in.nia.eq(addr)
 418     yield i_in.stop_mark.eq(0)
 419     yield i_m_in.tlbld.eq(0)
 420     yield i_m_in.tlbie.eq(0)
 421     yield i_m_in.addr.eq(0)
 422     yield i_m_in.pte.eq(0)
 423     yield
 424     yield
 425     yield
 426
 427     # miss, stalls for a bit
 428     yield i_in.req.eq(1)
 429     yield i_in.nia.eq(addr)
 430     yield
 431     valid = yield i_out.valid
 432     nia   = yield i_out.nia
 433     while not valid:
 434         yield
 435         valid = yield i_out.valid
 436     yield i_in.req.eq(0)
 437
 438     nia   = yield i_out.nia
 439     insn  = yield i_out.insn
 440
 441     yield
 442     yield
 443
 444     print ("fetched %x from addr %x" % (insn, nia))
 445     assert insn == expected_insn
 446
 447     print("=== test loadstore instruction (virtual) ===")
 448
 449     # look up i-cache expecting it to fail
 450
 451     # set address to 0x10200, update mem[] to 5678
 452     virt_addr = 0x10200
 453     real_addr = virt_addr
 454     expected_insn = 0x5678
 455     mem[real_addr] = expected_insn
 456
 457     yield i_in.priv_mode.eq(1)
 458     yield i_in.virt_mode.eq(1)
 459     yield i_in.req.eq(0)
 460     yield i_in.nia.eq(virt_addr)
 461     yield i_in.stop_mark.eq(0)
 462     yield i_m_in.tlbld.eq(0)
 463     yield i_m_in.tlbie.eq(0)
 464     yield i_m_in.addr.eq(0)
 465     yield i_m_in.pte.eq(0)
 466     yield
 467     yield
 468     yield
 469
 470     # miss, stalls for a bit
 471     yield i_in.req.eq(1)
 472     yield i_in.nia.eq(virt_addr)
 473     yield
 474     valid = yield i_out.valid
 475     failed = yield i_out.fetch_failed
 476     while not valid and not failed:
 477         yield
 478         valid = yield i_out.valid
 479         failed = yield i_out.fetch_failed
 480     yield i_in.req.eq(0)
 481
 482     print ("failed?", "yes" if failed else "no")
 483     assert failed == 1
 484     yield
 485     yield
 486
 487     print("=== test invalid loadstore instruction (instruction fault) ===")
 488
 489     virt_addr = 0x10200
 490
 491     yield ldst.priv_mode.eq(0)
 492     yield ldst.instr_fault.eq(1)
 493     yield ldst.maddr.eq(virt_addr)
 494     #ld_data, exctype, exc = yield from pi_ld(pi, virt_addr, 8, msr_pr=1)
 495     yield
 496     yield ldst.instr_fault.eq(0)
 497     while True:
 498         done = yield (ldst.done)
 499         exc_info = yield from get_exception_info(pi.exc_o)
 500         if done or exc_info.happened:
 501             break
 502         yield
 503     assert exc_info.happened == 1 # different here as expected
 504     yield ldst.instr_fault.eq(0)
 505     yield
 506     yield
 507     yield
 508
 509     wbget.stop = True
 510
 511
 512 def test_loadstore1_ifetch():
 513
 514     m, cmpi = setup_mmu()
 515
 516     mem = pagetables.test1
 517
 518     # nmigen Simulation
 519     sim = Simulator(m)
 520     sim.add_clock(1e-6)
 521
 522     icache = m.submodules.ldst.icache
 523     sim.add_sync_process(wrap(_test_loadstore1_ifetch(m, mem)))
 524     # add two wb_get processes onto the *same* memory dictionary.
 525     # this shouuuld work.... cross-fingers...
 526     sim.add_sync_process(wrap(wb_get(cmpi.wb_bus(), mem)))
 527     sim.add_sync_process(wrap(wb_get(icache.bus, mem)))
 528     with sim.write_vcd('test_loadstore1_ifetch.vcd'):
 529         sim.run()
 530
 531
 532 def test_loadstore1():
 533
 534     m, cmpi = setup_mmu()
 535
 536     mem = pagetables.test1
 537
 538     # nmigen Simulation
 539     sim = Simulator(m)
 540     sim.add_clock(1e-6)
 541
 542     sim.add_sync_process(wrap(_test_loadstore1(m, mem)))
 543     sim.add_sync_process(wrap(wb_get(cmpi.wb_bus(), mem)))
 544     with sim.write_vcd('test_loadstore1.vcd'):
 545         sim.run()
 546
 547
 548 def test_loadstore1_invalid():
 549
 550     m, cmpi = setup_mmu()
 551
 552     mem = {}
 553
 554     # nmigen Simulation
 555     sim = Simulator(m)
 556     sim.add_clock(1e-6)
 557
 558     sim.add_sync_process(wrap(_test_loadstore1_invalid(m, mem)))
 559     sim.add_sync_process(wrap(wb_get(cmpi.wb_bus(), mem)))
 560     with sim.write_vcd('test_loadstore1_invalid.vcd'):
 561         sim.run()
 562
 563 def test_loadstore1_ifetch_invalid():
 564     m, cmpi = setup_mmu()
 565
 566     # this is a specially-arranged page table which has the permissions
 567     # barred for execute on the leaf node (EAA=0x2 instead of EAA=0x3)
 568     mem = pagetables.test2
 569
 570     # nmigen Simulation
 571     sim = Simulator(m)
 572     sim.add_clock(1e-6)
 573
 574     icache = m.submodules.ldst.icache
 575     sim.add_sync_process(wrap(_test_loadstore1_ifetch_invalid(m, mem)))
 576     # add two wb_get processes onto the *same* memory dictionary.
 577     # this shouuuld work.... cross-fingers...
 578     sim.add_sync_process(wrap(wb_get(cmpi.wb_bus(), mem)))
 579     sim.add_sync_process(wrap(wb_get(icache.bus, mem)))
 580     with sim.write_vcd('test_loadstore1_ifetch_invalid.vcd'):
 581         sim.run()
 582
 583
 584
 585 if __name__ == '__main__':
 586     test_loadstore1()
 587     test_loadstore1_invalid()
 588     test_loadstore1_ifetch()
 589     test_loadstore1_ifetch_invalid()
 590