From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BEF81C282C0 for ; Wed, 23 Jan 2019 16:25:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8152621726 for ; Wed, 23 Jan 2019 16:25:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726311AbfAWQZG (ORCPT ); Wed, 23 Jan 2019 11:25:06 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:59515 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726126AbfAWQZG (ORCPT ); Wed, 23 Jan 2019 11:25:06 -0500 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 2D5A120135342E; Wed, 23 Jan 2019 17:25:03 +0100 (CET) Subject: Re: ipmi_si: 90 s delay in system start with 4.14.94, but not 4.18.6 To: Corey Minyard , openipmi-developer@lists.sourceforge.net, LKML Cc: it+lkml@molgen.mpg.de References: <8520014d-6805-ce87-143d-fffbeb94d11d@molgen.mpg.de> <78de72f8-e218-f91f-97b2-768ff5a920e4@acm.org> From: Paul Menzel Message-ID: <9ca94005-e2e4-cd5a-67bd-30c3d8680281@molgen.mpg.de> Date: Wed, 23 Jan 2019 17:25:02 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <78de72f8-e218-f91f-97b2-768ff5a920e4@acm.org> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms090708040203090906000602" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms090708040203090906000602 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Corey, On 01/22/19 21:58, Corey Minyard wrote: > On 1/22/19 10:17 AM, Paul Menzel wrote: >> Using Linux 4.14.94 on a HP EliteDesk 705 G4 MT desktop system, there >> is a 100 s delay during boot. >> >> ``` >> [=C2=A0=C2=A0=C2=A0 0.000000] Linux version 4.14.94.mx64.239 (root@x.m= olgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Jan 21 11:39:45 CET 20= 19 >> [=E2=80=A6] >> [=C2=A0=C2=A0=C2=A0 3.263092] ipmi message handler version 39.2 >> [=C2=A0=C2=A0=C2=A0 3.263520] ipmi device interface >> [=C2=A0=C2=A0=C2=A0 3.263893] IPMI System Interface driver. >> [=C2=A0=C2=A0=C2=A0 3.264325] ipmi_si 0000:06:00.3: probing via PCI >> [=C2=A0=C2=A0=C2=A0 3.264804] ipmi_si 0000:06:00.3: [io=C2=A0 0x3000-0= x30ff] regsize 1 spacing 1 irq 39 >> [=C2=A0=C2=A0=C2=A0 3.265496] ipmi_si: Adding PCI-specified kcs state = machine >> [=C2=A0=C2=A0=C2=A0 3.266019] ipmi_si: Trying PCI-specified kcs state = machine at i/o address 0x3000, slave address 0x0, irq 39 >> [=C2=A0=C2=A0=C2=A0 4.255042] tsc: Refined TSC clocksource calibration= : 3593.250 MHz >> [=C2=A0=C2=A0=C2=A0 4.255618] clocksource: tsc: mask: 0xffffffffffffff= ff max_cycles: 0x33cb6addeae, max_idle_ns: 440795225061 ns >> [=C2=A0=C2=A0=C2=A0 5.264130] clocksource: Switched to clocksource tsc= >> [=C2=A0 104.978023] ipmi_si 0000:06:00.3: There appears to be no BMC a= t this location >> [=C2=A0 104.978658] IPMI Watchdog: driver initialized >> [=C2=A0 104.979095] Copyright (C) 2004 MontaVista Software - IPMI Powe= rdown via sys_reboot. >> [=E2=80=A6] >> ``` >> >> Testing Linux 4.18.6 and 4.20, there is no such delay. >> >> ``` >> [=C2=A0=C2=A0=C2=A0 0.000000] Linux version 4.18.6.mx64.221 (root@x.mo= lgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Thu Sep 6 07:51:05 CEST 201= 8 >> [=E2=80=A6] >> [=C2=A0=C2=A0=C2=A0 2.951174] ipmi message handler version 39.2 >> [=C2=A0=C2=A0=C2=A0 2.951604] ipmi device interface >> [=C2=A0=C2=A0=C2=A0 2.951973] IPMI System Interface driver. >> [=C2=A0=C2=A0=C2=A0 2.952404] ipmi_si: Unable to find any System Inter= face(s) >> [=C2=A0=C2=A0=C2=A0 2.952909] IPMI Watchdog: driver initialized >> [=C2=A0=C2=A0=C2=A0 2.953339] Copyright (C) 2004 MontaVista Software -= IPMI Powerdown via sys_reboot. >> [=C2=A0=C2=A0=C2=A0 2.954053] input: Power Button as /devices/LNXSYSTM= :00/LNXSYBUS:00/PNP0C0C:00/input/input0 >> [=E2=80=A6] >> ``` >> >> 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. >=20 > That's really strange.=C2=A0 Generally when something like this happens= , it > means that there is sort of an IPMI interface there, but it's not compl= ete. > This happens when the low-level hardware is there, but there is no > processor behind it to actually do anything. >=20 > But as you can see, in 4.18 it wasn't detecting anything, and in 4.19 > it is seeing an IPMI device on the PCI bus.=C2=A0 The discovery here is= done > by the PCI code, it's out of the IPMI drivers hands until the PCI code > delivers it. >=20 > So what I'm guessing is that something changed so that the PCI > code is now recognising that there is an IPMI device there by the > PCI class codes.=C2=A0 There really isn't a device completely there, so= > it doesn't work. >=20 > I don't see anything in the IPMI code that would cause that. >=20 > If this is a problem, the device can be blacklisted in > ipmi_pci_blacklist in ipmi_si_pci.c. For whatever reason, I didn=E2=80=99t read that last paragraph, so bisect= ion brought me to your commit bc48fa1b9d (ipmi:pci: Blacklist a Realtek "IPMI" device) doing exactly that, blacklisting the device. $ lspci -nn -s 06:00.3 06:00.3 IPMI SMIC interface [0c07]: Realtek Semiconductor Co., Ltd. D= evice [10ec:816c] (rev 0e) I=E2=80=99ll backported it to Linux 4.14.x, and send the commit to stable@vger.kernel.org. [=E2=80=A6] Kind regards, Paul [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/c= ommit/?id=3Dbc48fa1b9d3b04106055b27078da824cd209865a --------------ms090708040203090906000602 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT AkRFMSswKQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYD VQQLDBZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFs Um9vdCBDbGFzcyAyMB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNV BAYTAkRFMUUwQwYDVQQKEzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVu IEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERG Ti1WZXJlaW4gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkgMjCCASIwDQYJKoZIhvcNAQEBBQAD 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