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authorBjorn Helgaas <bhelgaas@google.com>2020-01-30 00:00:02 +0100
committerBjorn Helgaas <bhelgaas@google.com>2020-01-30 00:00:02 +0100
commitdb83c269d22598ec1f5e3e6692a58a92a153e5f1 (patch)
tree153068534a8861bc6bb34be130861d7f6df2e971 /drivers/pci/pci.c
parentMerge branch 'pci/virtualization' (diff)
parentPCI: vmd: Add two VMD Device IDs (diff)
downloadlinux-db83c269d22598ec1f5e3e6692a58a92a153e5f1.tar.xz
linux-db83c269d22598ec1f5e3e6692a58a92a153e5f1.zip
Merge branch 'pci/host-vmd'
- Save VMD's pci_dev in x86 struct pci_sysdata (Jon Derrick) - Add pci_real_dma_dev() for DMA aliases not on the same bus as requester (Jon Derrick) - Add IOMMU mappings for pci_real_dma_dev() (Jon Derrick) - Remove IOMMU sanity checks for VMD devices (Jon Derrick) - Remove VMD dma_map_ops overrides (Jon Derrick) - Remove unused X86_DEV_DMA_OPS (Christoph Hellwig) - Add VMD device IDs that need bus restriction mode (Sushma Kalakota) * pci/host-vmd: PCI: vmd: Add two VMD Device IDs x86/PCI: Remove X86_DEV_DMA_OPS PCI: vmd: Remove dma_map_ops overrides iommu/vt-d: Remove VMD child device sanity check iommu/vt-d: Use pci_real_dma_dev() for mapping PCI: Introduce pci_real_dma_dev() x86/PCI: Expose VMD's pci_dev in struct pci_sysdata x86/PCI: Add to_pci_sysdata() helper
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 581b17707646..36d24f29d0e3 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6048,7 +6048,9 @@ bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2)
return (dev1->dma_alias_mask &&
test_bit(dev2->devfn, dev1->dma_alias_mask)) ||
(dev2->dma_alias_mask &&
- test_bit(dev1->devfn, dev2->dma_alias_mask));
+ test_bit(dev1->devfn, dev2->dma_alias_mask)) ||
+ pci_real_dma_dev(dev1) == dev2 ||
+ pci_real_dma_dev(dev2) == dev1;
}
bool pci_device_is_present(struct pci_dev *pdev)
@@ -6072,6 +6074,21 @@ void pci_ignore_hotplug(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(pci_ignore_hotplug);
+/**
+ * pci_real_dma_dev - Get PCI DMA device for PCI device
+ * @dev: the PCI device that may have a PCI DMA alias
+ *
+ * Permits the platform to provide architecture-specific functionality to
+ * devices needing to alias DMA to another PCI device on another PCI bus. If
+ * the PCI device is on the same bus, it is recommended to use
+ * pci_add_dma_alias(). This is the default implementation. Architecture
+ * implementations can override this.
+ */
+struct pci_dev __weak *pci_real_dma_dev(struct pci_dev *dev)
+{
+ return dev;
+}
+
resource_size_t __weak pcibios_default_alignment(void)
{
return 0;