linux-kernel - ipmi_si: 90 s delay in system start with 4.14.94, but not 4.18.6

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Message-ID: <8520014d-6805-ce87-143d-fffbeb94d11d@molgen.mpg.de>
Date:   Tue, 22 Jan 2019 17:17:43 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     openipmi-developer@...ts.sourceforge.net,
        LKML <linux-kernel@...r.kernel.org>
Cc:     it+lkml@...gen.mpg.de
Subject: ipmi_si: 90 s delay in system start with 4.14.94, but not 4.18.6

Dear Linux folks,


Using Linux 4.14.94 on a HP EliteDesk 705 G4 MT desktop system, there
is a 100 s delay during boot.

```
[    0.000000] Linux version 4.14.94.mx64.239 (root@...olgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Jan 21 11:39:45 CET 2019
[…]
[    3.263092] ipmi message handler version 39.2
[    3.263520] ipmi device interface
[    3.263893] IPMI System Interface driver.
[    3.264325] ipmi_si 0000:06:00.3: probing via PCI
[    3.264804] ipmi_si 0000:06:00.3: [io  0x3000-0x30ff] regsize 1 spacing 1 irq 39
[    3.265496] ipmi_si: Adding PCI-specified kcs state machine
[    3.266019] ipmi_si: Trying PCI-specified kcs state machine at i/o address 0x3000, slave address 0x0, irq 39
[    4.255042] tsc: Refined TSC clocksource calibration: 3593.250 MHz
[    4.255618] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x33cb6addeae, max_idle_ns: 440795225061 ns
[    5.264130] clocksource: Switched to clocksource tsc
[  104.978023] ipmi_si 0000:06:00.3: There appears to be no BMC at this location
[  104.978658] IPMI Watchdog: driver initialized
[  104.979095] Copyright (C) 2004 MontaVista Software - IPMI Powerdown via sys_reboot.
[…]
```

Testing Linux 4.18.6 and 4.20, there is no such delay.

```
[    0.000000] Linux version 4.18.6.mx64.221 (root@...olgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Thu Sep 6 07:51:05 CEST 2018
[…]
[    2.951174] ipmi message handler version 39.2
[    2.951604] ipmi device interface
[    2.951973] IPMI System Interface driver.
[    2.952404] ipmi_si: Unable to find any System Interface(s)
[    2.952909] IPMI Watchdog: driver initialized
[    2.953339] Copyright (C) 2004 MontaVista Software - IPMI Powerdown via sys_reboot.
[    2.954053] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0
[…]
```

Do you have a suggestion, what commit might have fixed this? Quickly
going through the commit history, it looks like, last year a lot of
bug fixes and clean-up was done.

If nobody knows, I might bisect to find the commit fixing this, but
will probably put more effort into updating the system to the Linux
4.19 series, where the only problem holding us back is that Nvidia’s
driver 390.87 needs to be patched.


Kind regards,

Paul

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