VT-d: pci code cleanup

This patch moves the pci code from iommu.c to pci.c. Instead of setup
pci hierarchy in array bus2bridge in iommu_context_mapping, use
scan_pci_devices once to add all existed PCI devices in system to
alldevs_list and setup pci hierarchy in array bus2bridge. In addition,
implement find_upstream_bridge to find the upstream PCIe-to-PCI/PCIX
bridge or PCI legacy bridge for a PCI device, therefore it's cleanly
to handle context map/unmap for PCI device, even for source-id
setting.

Signed-off-by: Weidong Han <weidong.han@intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 86abf2e85f..32ec850a1c 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -66,6 +66,17 @@ struct pci_dev {
 
 extern spinlock_t pcidevs_lock;
 
+enum {
+    DEV_TYPE_PCIe_ENDPOINT,
+    DEV_TYPE_PCIe_BRIDGE,       // PCIe root port, switch
+    DEV_TYPE_PCIe2PCI_BRIDGE,   // PCIe-to-PCI/PCIx bridge
+    DEV_TYPE_LEGACY_PCI_BRIDGE, // Legacy PCI bridge
+    DEV_TYPE_PCI,
+};
+
+int scan_pci_devices(void);
+int pdev_type(u8 bus, u8 devfn);
+int find_upstream_bridge(u8 *bus, u8 *devfn, u8 *secbus);
 struct pci_dev *alloc_pdev(u8 bus, u8 devfn);
 void free_pdev(struct pci_dev *pdev);
 struct pci_dev *pci_lock_pdev(int bus, int devfn);