pciinit: bridges can have two regions too

 Patch takes into account PCI bar and ROM regions of PCI bridges

Original patch by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Signed-off-by: Alexey Korolev <alexey.korolev@endace.com>

2 files changed, 6 insertions, 3 deletions

diff --git a/src/pci.h b/src/pci.h
index 5598100..6be838c 100644
--- a/src/pci.h
+++ b/src/pci.h
@@ -5,6 +5,7 @@
 
 #define PCI_ROM_SLOT 6
 #define PCI_NUM_REGIONS 7
+#define PCI_BRIDGE_NUM_REGIONS 2
 
 static inline u8 pci_bdf_to_bus(u16 bdf) {
     return bdf >> 8;
diff --git a/src/pciinit.c b/src/pciinit.c
index 2bd4426..9b521e3 100644
--- a/src/pciinit.c
+++ b/src/pciinit.c
@@ -370,13 +370,15 @@ static int pci_bios_check_devices(struct pci_bus *busses)
     // Calculate resources needed for regular (non-bus) devices.
     struct pci_device *pci;
     foreachpci(pci) {
-        if (pci->class == PCI_CLASS_BRIDGE_PCI) {
+        if (pci->class == PCI_CLASS_BRIDGE_PCI)
             busses[pci->secondary_bus].bus_dev = pci;
-            continue;
-        }
+
         struct pci_bus *bus = &busses[pci_bdf_to_bus(pci->bdf)];
         int i;
         for (i = 0; i < PCI_NUM_REGIONS; i++) {
+            if ((pci->class == PCI_CLASS_BRIDGE_PCI) &&
+                (i >= PCI_BRIDGE_NUM_REGIONS && i < PCI_ROM_SLOT))
+                continue;
             u32 val, size;
             pci_bios_get_bar(pci, i, &val, &size);
             if (val == 0)