From nobody Mon Apr 6 04:44:16 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 43639C6FA83 for ; Sun, 11 Sep 2022 08:48:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230061AbiIKIse (ORCPT ); Sun, 11 Sep 2022 04:48:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230013AbiIKIr6 (ORCPT ); Sun, 11 Sep 2022 04:47:58 -0400 Received: from mx-out.tlen.pl (mx-out.tlen.pl [193.222.135.158]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C894832A8A for ; Sun, 11 Sep 2022 01:47:55 -0700 (PDT) Received: (wp-smtpd smtp.tlen.pl 33916 invoked from network); 11 Sep 2022 10:47:52 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=o2.pl; s=1024a; t=1662886072; bh=cRz0HbGLs7FSStcgbrNdUbSH64ygwZ0Op1wX151XXck=; h=From:To:Cc:Subject; b=l0xQefst3EiOCTDZ22Lzyb17t1bnRaZ7hkAiN6HmGCc8uao6oAMIGJw9e7q7jXhfh iNtQUVijemJzzuSNgSjoY+UQ+4PkvCm55MIVHKWeEOiUnx1yn/oPVKhT6ka9QAzCgG bTWHZ4XxrPwJLHgjhn+9QFA7s9TrSn4E4NIqa/MU= Received: from aafh243.neoplus.adsl.tpnet.pl (HELO localhost.localdomain) (mat.jonczyk@o2.pl@[83.4.137.243]) (envelope-sender ) by smtp.tlen.pl (WP-SMTPD) with SMTP for ; 11 Sep 2022 10:47:52 +0200 From: =?UTF-8?q?Mateusz=20Jo=C5=84czyk?= To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: =?UTF-8?q?Mateusz=20Jo=C5=84czyk?= , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , "Ira W . Snyder" , Bjorn Helgaas Subject: [PATCH v2 08/10] x86/Kconfig: make CONFIG_PCI_CNB20LE_QUIRK depend on X86_32 Date: Sun, 11 Sep 2022 10:47:09 +0200 Message-Id: <20220911084711.13694-9-mat.jonczyk@o2.pl> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220911084711.13694-1-mat.jonczyk@o2.pl> References: <20220911084711.13694-1-mat.jonczyk@o2.pl> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-WP-MailID: 59c754a3d27abd7d35107f6069d1709c X-WP-AV: skaner antywirusowy Poczty o2 X-WP-SPAM: NO 0000000 [EeN0] Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I was unable to find a good description of the ServerWorks CNB20LE chipset. However, it was probably exclusively used with the Pentium III processor (this CPU model was used in all references to it that I found where the CPU model was provided: dmesgs in [1] and [2]; [3] page 2; [4]-[7]). As is widely known, the Pentium III processor did not support the 64-bit mode, support for which was introduced by Intel a couple of years later. So it is safe to assume that no systems with the CNB20LE chipset have amd64 and the CONFIG_PCI_CNB20LE_QUIRK may now depend on X86_32. Additionally, I have determined that most computers with the CNB20LE chipset did have ACPI support and this driver was inactive on them. I have submitted a patch to remove this driver, but it was met with resistance [8]. [1] Jim Studt, Re: Problem with ServerWorks CNB20LE and lost interrupts Linux Kernel Mailing List, https://lkml.org/lkml/2002/1/11/111 [2] RedHat Bug 665109 - e100 problems on old Compaq Proliant DL320 https://bugzilla.redhat.com/show_bug.cgi?id=3D665109 [3] R. Hughes-Jones, S. Dallison, G. Fairey, Performance Measurements on Gigabit Ethernet NICs and Server Quality Motherboards, http://datatag.web.cern.ch/papers/pfldnet2003-rhj.doc [4] "Hardware for Linux", Probe #d6b5151873 of Intel STL2-bd A28808-302 Desktop Computer (STL2) https://linux-hardware.org/?probe=3Dd6b5151873 [5] "Hardware for Linux", Probe #0b5d843f10 of Compaq ProLiant DL380 https://linux-hardware.org/?probe=3D0b5d843f10 [6] Ubuntu Forums, Dell Poweredge 2400 - Adaptec SCSI Bus AIC-7880 https://ubuntuforums.org/showthread.php?t=3D1689552 [7] Ira W. Snyder, "BISECTED: 2.6.35 (and -git) fail to boot: APIC problems" https://lkml.org/lkml/2010/8/13/220 [8] Bjorn Helgaas, "Re: [PATCH] x86/pci: drop ServerWorks / Broadcom CNB20LE PCI host bridge driver" https://lore.kernel.org/lkml/20220318165535.GA840063@bhelgaas/T/ Signed-off-by: Mateusz Jo=C5=84czyk Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: Ira W. Snyder Cc: Bjorn Helgaas --- v2: make CONFIG_PCI_CNB20LE_QUIRK depend on X86_32 (previously only help text and description were changed) upgrade short description. arch/x86/Kconfig | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index fdfe8b7e895a..31f778b0cd0b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2739,13 +2739,21 @@ config MMCONF_FAM10H depends on X86_64 && PCI_MMCONFIG && ACPI =20 config PCI_CNB20LE_QUIRK - bool "Read CNB20LE Host Bridge Windows" if EXPERT - depends on PCI + bool "Read PCI host bridge windows from the CNB20LE chipset" if EXPERT + depends on X86_32 && PCI help Read the PCI windows out of the CNB20LE host bridge. This allows PCI hotplug to work on systems with the CNB20LE chipset which do not have ACPI. =20 + The ServerWorks (later Broadcom) CNB20LE was a chipset designed + most probably only for Pentium III. + + To find out if you have such a chipset, search for a PCI device with + 1166:0009 PCI IDs, for example by executing + lspci -nn | grep '1166:0009' + The code is inactive if there is none. + There's no public spec for this chipset, and this functionality is known to be incomplete. =20 --=20 2.25.1