Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752892AbcD0MqX (ORCPT ); Wed, 27 Apr 2016 08:46:23 -0400 Received: from e28smtp08.in.ibm.com ([125.16.236.8]:53378 "EHLO e28smtp08.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752287AbcD0MqU (ORCPT ); Wed, 27 Apr 2016 08:46:20 -0400 X-IBM-Helo: d28relay04.in.ibm.com X-IBM-MailFrom: xyjxie@linux.vnet.ibm.com X-IBM-RcptTo: linux-pci@vger.kernel.org;linux-kernel@vger.kernel.org;kvm@vger.kernel.org From: Yongji Xie To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org Cc: alex.williamson@redhat.com, bhelgaas@google.com, aik@ozlabs.ru, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, joro@8bytes.org, warrier@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, eric.auger@linaro.org, will.deacon@arm.com, gwshan@linux.vnet.ibm.com, David.Laight@ACULAB.COM, alistair@popple.id.au, ruscur@russell.cc, Yongji Xie Subject: [PATCH 2/5] iommu: Set PCI_BUS_FLAGS_MSI_REMAP if IOMMU have capability of IRQ remapping Date: Wed, 27 Apr 2016 20:43:27 +0800 Message-Id: <1461761010-5452-3-git-send-email-xyjxie@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1461761010-5452-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1461761010-5452-1-git-send-email-xyjxie@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 16042712-0029-0000-0000-00000D121C3C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1708 Lines: 54 The capability of IRQ remapping is abstracted on IOMMU side on some archs. There is a existing flag IOMMU_CAP_INTR_REMAP for this. To have a universal flag to test this capability for different archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses when IOMMU_CAP_INTR_REMAP is set. Signed-off-by: Yongji Xie --- drivers/iommu/iommu.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 0e3b009..5d2b6f6 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -813,6 +813,16 @@ struct iommu_group *pci_device_group(struct device *dev) return group; } +static void pci_check_msi_remapping(struct pci_dev *pdev, + const struct iommu_ops *ops) +{ + struct pci_bus *bus = pdev->bus; + + if (ops->capable(IOMMU_CAP_INTR_REMAP) && + !(bus->bus_flags & PCI_BUS_FLAGS_MSI_REMAP)) + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; +} + /** * iommu_group_get_for_dev - Find or create the IOMMU group for a device * @dev: target device @@ -871,6 +881,9 @@ static int add_iommu_group(struct device *dev, void *data) const struct iommu_ops *ops = cb->ops; int ret; + if (dev_is_pci(dev) && ops->capable) + pci_check_msi_remapping(to_pci_dev(dev), ops); + if (!ops->add_device) return 0; @@ -913,6 +926,8 @@ static int iommu_bus_notifier(struct notifier_block *nb, * result in ADD/DEL notifiers to group->notifier */ if (action == BUS_NOTIFY_ADD_DEVICE) { + if (dev_is_pci(dev) && ops->capable) + pci_check_msi_remapping(to_pci_dev(dev), ops); if (ops->add_device) return ops->add_device(dev); } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { -- 1.7.9.5