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CPUs with empty lpid on Graviton 4 #3

Description

@chrisswinchatt-arm

I got this exception from cmn_capture.py:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "__main__.py", line 233, in <module>
    sys.exit(main())
             ^^^^^^
  File "__main__.py", line 195, in main
    dataset = collect_mapping(options)
              ^^^^^^^^^^^^^^^^^^^^^^^^
  File "collect.py", line 54, in collect_mapping
    with CaptureSession(
         ^^^^^^^^^^^^^^^
  File "capture.py", line 145, in __init__
    self._session = cmn_capture.TraceSession(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "cmn-tools/src/cmn_capture.py", line 507, in __init__
    handler.set_cmns(list(self.CMNs()))        # The trace visualizer
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "cmn-tools/src/cmn_capture.py", line 203, in set_cmns
    self.build_id_map()
  File "cmn-tools/src/cmn_capture.py", line 220, in build_id_map
    for k in sorted(self.id_map.keys()):
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'NoneType' and 'int

Printing self.id_map.keys() produced this (note last two):

ID map:
dict_keys([(0, 0, 0), (0, 2, 0), (0, 4, 0), (0, 8, 0), (0, 12, 0), (0, 16, 0), (0, 20, 0), (0, 24, 0), (0, 28, 0), (0, 32, 0), (0, 36, 0), (0, 40, 0), (0, 44, 0), (0, 48, 0), (0, 52, 0), (0, 56, 0), (0, 60, 0), (0, 64, 0), (0, 66, 0), (0, 68, 0), (0, 128, 0), (0, 130, 0), (0, 132, 0), (0, 133, 0), (0, 136, 0), (0, 137, 0), (0, 140, 0), (0, 141, 0), (0, 144, 0), (0, 145, 0), (0, 148, 0), (0, 149, 0), (0, 152, 0), (0, 153, 0), (0, 156, 0), (0, 157, 0), (0, 160, 0), (0, 161, 0), (0, 164, 0), (0, 165, 0), (0, 168, 0), (0, 169, 0), (0, 172, 0), (0, 173, 0), (0, 176, 0), (0, 177, 0), (0, 180, 0), (0, 181, 0), (0, 184, 0), (0, 185, 0), (0, 188, 0), (0, 189, 0), (0, 192, 0), (0, 193, 0), (0, 196, 0), (0, 197, 0), (0, 256, 0), (0, 258, 0), (0, 260, 0), (0, 264, 0), (0, 265, 0), (0, 268, 0), (0, 269, 0), (0, 272, 0), (0, 273, 0), (0, 276, 0), (0, 277, 0), (0, 280, 0), (0, 281, 0), (0, 284, 0), (0, 285, 0), (0, 288, 0), (0, 289, 0), (0, 292, 0), (0, 293, 0), (0, 296, 0), (0, 297, 0), (0, 300, 0), (0, 301, 0), (0, 304, 0), (0, 305, 0), (0, 308, 0), (0, 309, 0), (0, 312, 0), (0, 313, 0), (0, 316, 0), (0, 317, 0), (0, 320, 0), (0, 321, 0), (0, 324, 0), (0, 325, 0), (0, 384, 0), (0, 386, 0), (0, 388, 0), (0, 389, 0), (0, 392, 0), (0, 393, 0), (0, 396, 0), (0, 397, 0), (0, 400, 0), (0, 401, 0), (0, 404, 0), (0, 405, 0), (0, 408, 0), (0, 409, 0), (0, 412, 0), (0, 413, 0), (0, 416, 0), (0, 417, 0), (0, 420, 0), (0, 421, 0), (0, 424, 0), (0, 425, 0), (0, 428, 0), (0, 429, 0), (0, 432, 0), (0, 433, 0), (0, 436, 0), (0, 437, 0), (0, 440, 0), (0, 441, 0), (0, 444, 0), (0, 445, 0), (0, 448, 0), (0, 449, 0), (0, 452, 0), (0, 453, 0), (0, 512, 0), (0, 513, 0), (0, 516, 0), (0, 517, 0), (0, 520, 0), (0, 521, 0), (0, 524, 0), (0, 525, 0), (0, 528, 0), (0, 529, 0), (0, 532, 0), (0, 533, 0), (0, 536, 0), (0, 537, 0), (0,540, 0), (0, 541, 0), (0, 544, 0), (0, 545, 0), (0, 548, 0), (0, 549, 0), (0, 552, 0), (0, 553, 0), (0, 556, 0), (0, 557, 0), (0, 560, 0), (0, 561, 0),(0, 564, 0), (0, 565, 0), (0, 568, 0), (0, 569, 0), (0, 572, 0), (0, 573, 0), (0, 576, 0), (0, 577, 0), (0, 580, 0), (0, 581, 0), (0, 640, 0), (0, 641,0), (0, 644, 0), (0, 645, 0), (0, 648, 0), (0, 649, 0), (0, 652, 0), (0, 653, 0), (0, 656, 0), (0, 657, 0), (0, 660, 0), (0, 661, 0), (0, 664, 0), (0, 665, 0), (0, 668, 0), (0, 669, 0), (0, 672, 0), (0, 673, 0), (0, 676, 0), (0, 677, 0), (0, 680, 0), (0, 681, 0), (0, 684, 0), (0, 685, 0), (0, 688, 0), (0, 689, 0), (0, 692, 0), (0, 693, 0), (0, 696, 0), (0, 697, 0), (0, 700, 0), (0, 701, 0), (0, 704, 0), (0, 706, 0), (0, 708, 0), (0, 709, 0), (0, 768, 0), (0, 769, 0), (0, 772, 0), (0, 773, 0), (0, 776, 0), (0, 777, 0), (0, 780, 0), (0, 781, 0), (0, 784, 0), (0, 785, 0), (0, 788, 0), (0, 789, 0), (0, 792, 0), (0, 793, 0), (0, 796, 0), (0, 797, 0), (0, 800, 0), (0, 801, 0), (0, 804, 0), (0, 805, 0), (0, 808, 0), (0, 809, 0), (0, 812, 0), (0, 813, 0), (0, 816, 0), (0, 817, 0), (0, 820, 0), (0, 821, 0), (0, 824, 0), (0, 825, 0), (0, 828, 0), (0, 829, 0), (0, 832, 0), (0, 834, 0), (0, 836, 0), (0, 896, 0), (0, 898, 0), (0, 900, 0), (0, 904, 0), (0, 908, 0), (0, 912, 0), (0, 916, 0), (0, 920, 0), (0, 924, 0), (0, 928, 0), (0, 932, 0), (0, 936, 0), (0, 940, 0), (0, 944, 0), (0, 948, 0), (0, 952, 0), (0, 956, 0), (0, 960, 0), (0, 962, 0), (0, 964, 0), (0, 965, 0), (0, 700, None), (0, 580, None)])

A quick look at ~/.cache/arm/cmn-system.json:

                            {
                                "port": 1,
                                "type": 25,
                                "type_s": "RN-F_E_E",
                                "cal": 2,
                                "ccs": 1,
                                "pdevices": [
                                    {
                                        "device_number": 0,
                                        "id": 580
                                    }
                                ],
                                "devices": [
                                    {
                                        "id": 580,
                                        "type": 15,
                                        "type_s": "RN-SAM"
                                    }
                                ],
                                "attached": [
                                    {
                                        "type": "cpu",
                                        "cpu": 81,
                                        "mseq": 0,
                                        "id": 580,
                                        "lpid": null
                                    }
                                ]
                            }

So maybe cmn_detect_cpu.py or perhaps the arm_cmn module is bugged on this platform.

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