diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2012-05-30 20:19:31 (GMT) |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2012-06-25 11:48:29 (GMT) |
| commit | 664b600331128146d8ddd3e004defe23ba5c47dc (patch) | |
| tree | 20fa398405b31f6683ae9ef32e98515b8ebab903 /drivers | |
| parent | abdfdde2534c48d7a761fc437ad3d840a5947dbc (diff) | |
| download | linux-664b600331128146d8ddd3e004defe23ba5c47dc.tar.xz | |
amd_iommu: Make use of DMA quirks and ACS checks in IOMMU groups
Work around broken devices and adhere to ACS support when determining
IOMMU grouping.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 60ea920..4917239 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -254,6 +254,14 @@ static bool check_device(struct device *dev) return true; } +static void swap_pci_ref(struct pci_dev **from, struct pci_dev *to) +{ + pci_dev_put(*from); + *from = to; +} + +#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) + static int iommu_init_device(struct device *dev) { struct pci_dev *dma_pdev, *pdev = to_pci_dev(dev); @@ -286,6 +294,23 @@ static int iommu_init_device(struct device *dev) } else dma_pdev = pci_dev_get(pdev); + swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev)); + + if (dma_pdev->multifunction && + !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)) + swap_pci_ref(&dma_pdev, + pci_get_slot(dma_pdev->bus, + PCI_DEVFN(PCI_SLOT(dma_pdev->devfn), + 0))); + + while (!pci_is_root_bus(dma_pdev->bus)) { + if (pci_acs_path_enabled(dma_pdev->bus->self, + NULL, REQ_ACS_FLAGS)) + break; + + swap_pci_ref(&dma_pdev, pci_dev_get(dma_pdev->bus->self)); + } + group = iommu_group_get(&dma_pdev->dev); pci_dev_put(dma_pdev); if (!group) { |