From e17f9ff413a4052d532c11c1e1c6eb27c71aada2 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Thu, 3 Jul 2014 09:51:37 -0600 Subject: [PATCH] iommu/vt-d: Use iommu_group_get_for_dev() The IOMMU code now provides a common interface for finding or creating an IOMMU group for a device on PCI buses. Make use of it and remove piles of code. Signed-off-by: Alex Williamson Cc: David Woodhouse Signed-off-by: Joerg Roedel --- drivers/iommu/intel-iommu.c | 79 ++----------------------------------- 1 file changed, 4 insertions(+), 75 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 51b6b77dc3e5..9128c84a51e7 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -45,7 +45,6 @@ #include #include "irq_remapping.h" -#include "pci.h" #define ROOT_SIZE VTD_PAGE_SIZE #define CONTEXT_SIZE VTD_PAGE_SIZE @@ -4373,91 +4372,21 @@ 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 iommu_group *group; - int ret; u8 bus, devfn; 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); - } - } - - /* - * 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; - - while (!bus->self) { - if (!pci_is_root_bus(bus)) - bus = bus->parent; - else - goto root_bus; - } - - if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) - break; - - swap_pci_ref(&dma_pdev, pci_dev_get(bus->self)); - } + group = iommu_group_get_for_dev(dev); -root_bus: - group = iommu_group_get(&dma_pdev->dev); - pci_dev_put(dma_pdev); - if (!group) { - group = iommu_group_alloc(); - if (IS_ERR(group)) - return PTR_ERR(group); - } - - ret = iommu_group_add_device(group, dev); + if (IS_ERR(group)) + return PTR_ERR(group); iommu_group_put(group); - return ret; + return 0; } static void intel_iommu_remove_device(struct device *dev) -- 2.39.2