pmc56_overflow_test from powerpc in ubuntu_kernel_selftests failed on F/H

[Po-Hsu Lin]

Issue found on Power8 node "modoc" with 5.4.0-44.48

 # selftests: powerpc/pmu/ebb: pmc56_overflow_test
 # test: pmc56_overflow
 # tags: git_version:unknown
 # [FAIL] Test FAILED on line 87
 # EBB Handler is at 0x10004c40
 # ebb_state:
 # ebb_count = 10
 # spurious = 0
 # negative = 0
 # no_overflow = 0
 # pmc[1] count = 0x0
 # pmc[2] count = 0x2800001e1
 # pmc[3] count = 0x0
 # pmc[4] count = 0x0
 # pmc[5] count = 0x109c8d025
 # pmc[6] count = 0xa2154274
 # HW state:
 # MMCR0 0x0000000084000000 FC PMAE
 # MMCR2 0x0000000000000000
 # EBBHR 0x0000000010004c40
 # BESCR 0x8000000000000000 GE
 # PMC1 0x0000000000000000
 # PMC2 0x0000000040000000
 # PMC3 0x0000000000000000
 # PMC4 0x0000000000000000
 # PMC5 0x0000000000000000
 # PMC6 0x0000000000000000
 # SIAR 0x0000000010004020
 # Trace buffer dump:
 # address 0x76f9c1c50000
 # tail 0x76f9c1c50246
 # size 1048576
 # overflow false
 # Content:
 # [0]: register SPRN_PMC2 = 0x0000000080000003
 # [1]: register SPRN_PMC5 = 0x0000000000000000
 # [2]: register SPRN_PMC6 = 0x0000000000000000
 # [3]: register SPRN_PMC2 = 0x0000000080000003
 # [4]: register SPRN_PMC5 = 0x00000000f7f65361
 # [5]: register SPRN_PMC6 = 0x000000003506baf9
 # [6]: register SPRN_PMC2 = 0x0000000080000003
 # [7]: register SPRN_PMC5 = 0x0000000011d27cc4
 # [8]: register SPRN_PMC6 = 0x000000006d0e877b
 # [9]: register SPRN_PMC2 = 0x0000000080000003
 # [10]: register SPRN_PMC5 = 0x0000000000000000
 # [11]: register SPRN_PMC6 = 0x0000000000000000
 # [12]: register SPRN_PMC2 = 0x0000000080000003
 # [13]: register SPRN_PMC5 = 0x0000000000000000
 # [14]: register SPRN_PMC6 = 0x0000000000000000
 # [15]: register SPRN_PMC2 = 0x0000000080000003
 # [16]: register SPRN_PMC5 = 0x0000000000000000
 # [17]: register SPRN_PMC6 = 0x0000000000000000
 # [18]: register SPRN_PMC2 = 0x0000000080000003
 # [19]: register SPRN_PMC5 = 0x0000000000000000
 # [20]: register SPRN_PMC6 = 0x0000000000000000
 # [21]: register SPRN_PMC2 = 0x0000000080000003
 # [22]: register SPRN_PMC5 = 0x0000000000000000
 # [23]: register SPRN_PMC6 = 0x0000000000000000
 # [24]: register SPRN_PMC2 = 0x0000000080000003
 # [25]: register SPRN_PMC5 = 0x0000000000000000
 # [26]: register SPRN_PMC6 = 0x0000000000000000
 # [27]: register SPRN_PMC2 = 0x0000000080000003
 # [28]: register SPRN_PMC5 = 0x0000000000000000
 # [29]: register SPRN_PMC6 = 0x0000000000000000
 # [30]: register SPRN_PMC2 = 0x00000000400001c3
 # PMC5/6 overflow 1
 # failure: pmc56_overflow
 not ok 5 selftests: powerpc/pmu/ebb: pmc56_overflow_test # exit=1

[Po-Hsu Lin (cypressyew)]

This can be found on 5.4.0-49.53 as well (passed with 5.4.0-48.52, probably not very stable)

[Kleber Sacilotto de Souza (kleber-souza)]

Found with hirsute/linux 5.11.0-34.36 on node dryden.

[Stefan Bader (smb)]

Again on dryden with 5.11.0-40.44 (sru-20211018)