From patchwork Sun Mar 29 15:04:04 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 6117131 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9433CBF4A6 for ; Sun, 29 Mar 2015 15:04:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B47D020251 for ; Sun, 29 Mar 2015 15:04:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9549620274 for ; Sun, 29 Mar 2015 15:04:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752807AbbC2PEM (ORCPT ); Sun, 29 Mar 2015 11:04:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56247 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752596AbbC2PEI (ORCPT ); Sun, 29 Mar 2015 11:04:08 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id D0AEEA0E52; Sun, 29 Mar 2015 15:04:07 +0000 (UTC) Received: from redhat.com (ovpn-116-29.ams2.redhat.com [10.36.116.29]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with SMTP id t2TF44GG016921; Sun, 29 Mar 2015 11:04:05 -0400 Date: Sun, 29 Mar 2015 17:04:04 +0200 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, Fam Zheng , Yinghai Lu , Yijing Wang , "Eric W. Biederman" Subject: [PATCH v5 02/10] pci: move pci_msi_init_pci_dev to probe.c Message-ID: <1427641227-7574-3-git-send-email-mst@redhat.com> References: <1427641227-7574-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1427641227-7574-1-git-send-email-mst@redhat.com> X-Mutt-Fcc: =sent X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP commit d5dea7d95c48d7bc951cee4910a7fd9c0cd26fb0 "PCI: msi: Disable msi interrupts when we initialize a pci device" fixes kexec when the booting kernel does not enable msi interupts. Unfortunately the relevant functionality is in msi.c so it isn't compiled in when CONFIG_PCI_MSI is off, which means such configurations would still get interrupt storms. Fix by moving part of the functionality probe.c, and compiling it unconditionally. Cc: Eric W. Biederman Signed-off-by: Michael S. Tsirkin Reviewed-by: Fam Zheng Acked-by: "Eric W. Biederman" --- drivers/pci/msi.c | 12 ------------ drivers/pci/probe.c | 16 ++++++++++++++++ 2 files changed, 16 insertions(+), 12 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 9942f68..f66be86 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1041,18 +1041,6 @@ EXPORT_SYMBOL(pci_msi_enabled); void pci_msi_init_pci_dev(struct pci_dev *dev) { INIT_LIST_HEAD(&dev->msi_list); - - /* Disable the msi hardware to avoid screaming interrupts - * during boot. This is the power on reset default so - * usually this should be a noop. - */ - dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); - if (dev->msi_cap) - pci_msi_set_enable(dev, 0); - - dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); - if (dev->msix_cap) - pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); } /** diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 8d2f400..50dd934 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1483,10 +1483,26 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) return dev; } +static void pci_msi_setup_pci_dev(struct pci_dev *dev) +{ + /* Disable the msi hardware to avoid screaming interrupts + * during boot. This is the power on reset default so + * usually this should be a noop. + */ + dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); + if (dev->msi_cap) + pci_msi_set_enable(dev, 0); + + dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (dev->msix_cap) + pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); +} + static void pci_init_capabilities(struct pci_dev *dev) { /* MSI/MSI-X list */ pci_msi_init_pci_dev(dev); + pci_msi_setup_pci_dev(dev); /* Buffers for saving PCIe and PCI-X capabilities */ pci_allocate_cap_save_buffers(dev);