linux-kernel - Marvell: hw perfevents: unable to count PMU IRQs

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Message-ID: <dc43adf0-daa3-b939-e0ed-5d0c8d01bd91@molgen.mpg.de>
Date:   Thu, 25 Mar 2021 22:39:28 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Vadym Kochan <vadym.kochan@...ision.eu>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Marvell: hw perfevents: unable to count PMU IRQs

Dear Linux folks,


On the Marvell Prestera switch, Linux 5.10.4 prints the error (with an 
additional info level message) below.

     [    0.000000] Linux version 5.10.4 (robimarko@...builder9) 
(aarch64-linux-gnu-gcc (Debian 6.3.0-18) 6.3.0 20170516, GNU ld (GNU 
Binutils for Debian) 2.28) #1 SMP PREEMPT Thu Mar 11 10:22:09 UTC 2021
     […]
     [    1.996658] hw perfevents: unable to count PMU IRQs
     [    2.001825] hw perfevents: /ap806/config-space@...00000/pmu: 
failed to register PMU devices!

```
# lscpu
Architecture:          aarch64
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    1
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Model:                 1
BogoMIPS:              50.00
L1d cache:             32K
L1i cache:             48K
L2 cache:              512K
NUMA node0 CPU(s):     0-3
Flags:                 fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
# cat /proc/cpuinfo
processor       : 0
BogoMIPS        : 50.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 1
[…]
```

Please find the output of `dmesg` attached.

How can the IRQs be counted?


Kind regards,

Paul

View attachment "linux_5.10.4–messages.txt" of type "text/plain" (55013 bytes)