From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: [PATCH 08/13] iommu/intel: Use pci_find_dma_isolation_root() for IOMMU groups From: Alex Williamson To: linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org Cc: bhelgaas@google.com, acooks@gmail.com, David Woodhouse , linux-kernel@vger.kernel.org Date: Thu, 01 May 2014 10:27:54 -0600 Message-ID: <20140501162754.17512.36589.stgit@bling.home> In-Reply-To: <20140501160128.17512.23609.stgit@bling.home> References: <20140501160128.17512.23609.stgit@bling.home> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: Drop custom code that attempts to do the exact same thing and use PCI provided isolation root support. Existing IOMMU group laytout should not change. Signed-off-by: Alex Williamson Cc: David Woodhouse --- drivers/iommu/intel-iommu.c | 71 +++++-------------------------------------- 1 file changed, 8 insertions(+), 63 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index f256ffc..f0e50f1 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -44,7 +44,6 @@ #include #include "irq_remapping.h" -#include "pci.h" #define ROOT_SIZE VTD_PAGE_SIZE #define CONTEXT_SIZE VTD_PAGE_SIZE @@ -4359,12 +4358,9 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain, return 0; } -#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) - static int intel_iommu_add_device(struct device *dev) { - struct pci_dev *pdev = to_pci_dev(dev); - struct pci_dev *bridge, *dma_pdev = NULL; + struct pci_dev *pdev; struct iommu_group *group; int ret; u8 bus, devfn; @@ -4372,68 +4368,16 @@ static int intel_iommu_add_device(struct device *dev) if (!device_to_iommu(dev, &bus, &devfn)) return -ENODEV; - bridge = pci_find_upstream_pcie_bridge(pdev); - if (bridge) { - if (pci_is_pcie(bridge)) - dma_pdev = pci_get_domain_bus_and_slot( - pci_domain_nr(pdev->bus), - bridge->subordinate->number, 0); - if (!dma_pdev) - dma_pdev = pci_dev_get(bridge); - } else - dma_pdev = pci_dev_get(pdev); - - /* Account for quirked devices */ - swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev)); - - /* - * If it's a multifunction device that does not support our - * required ACS flags, add to the same group as lowest numbered - * function that also does not suport the required ACS flags. - */ - if (dma_pdev->multifunction && - !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)) { - u8 i, slot = PCI_SLOT(dma_pdev->devfn); - - for (i = 0; i < 8; i++) { - struct pci_dev *tmp; - - tmp = pci_get_slot(dma_pdev->bus, PCI_DEVFN(slot, i)); - if (!tmp) - continue; - - if (!pci_acs_enabled(tmp, REQ_ACS_FLAGS)) { - swap_pci_ref(&dma_pdev, tmp); - break; - } - pci_dev_put(tmp); - } + group = iommu_group_get(dev); + if (group) { + iommu_group_put(group); + return 0; } - /* - * Devices on the root bus go through the iommu. If that's not us, - * find the next upstream device and test ACS up to the root bus. - * Finding the next device may require skipping virtual buses. - */ - while (!pci_is_root_bus(dma_pdev->bus)) { - struct pci_bus *bus = dma_pdev->bus; + pdev = pci_find_dma_isolation_root(to_pci_dev(dev)); - while (!bus->self) { - if (!pci_is_root_bus(bus)) - bus = bus->parent; - else - goto root_bus; - } + group = iommu_group_get(&pdev->dev); - if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) - break; - - swap_pci_ref(&dma_pdev, pci_dev_get(bus->self)); - } - -root_bus: - group = iommu_group_get(&dma_pdev->dev); - pci_dev_put(dma_pdev); if (!group) { group = iommu_group_alloc(); if (IS_ERR(group)) @@ -4443,6 +4387,7 @@ root_bus: ret = iommu_group_add_device(group, dev); iommu_group_put(group); + return ret; }