pci: add helper to retrieve the 64-bit range

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index ad1c1ca91e..52cbab7dc2 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2257,6 +2257,56 @@ void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
     bus->iommu_opaque = opaque;
 }
 
+static void pci_dev_get_w64(PCIBus *b, PCIDevice *dev, void *opaque)
+{
+    Range *range = opaque;
+    PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
+    uint16_t cmd = pci_get_word(dev->config + PCI_COMMAND);
+    int r;
+
+    if (!(cmd & PCI_COMMAND_MEMORY)) {
+        return;
+    }
+
+    if (pc->is_bridge) {
+        pcibus_t base = pci_bridge_get_base(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
+        pcibus_t limit = pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
+
+        base = MAX(base, 0x1ULL << 32);
+
+        if (limit >= base) {
+            Range pref_range;
+            pref_range.begin = base;
+            pref_range.end = limit + 1;
+            range_extend(range, &pref_range);
+        }
+    }
+    for (r = 0; r < PCI_NUM_REGIONS; ++r) {
+        PCIIORegion *region = &dev->io_regions[r];
+        Range region_range;
+
+        if (!region->size ||
+            (region->type & PCI_BASE_ADDRESS_SPACE_IO) ||
+            !(region->type & PCI_BASE_ADDRESS_MEM_TYPE_64)) {
+            continue;
+        }
+        region_range.begin = pci_get_quad(dev->config + pci_bar(dev, r));
+        region_range.end = region_range.begin + region->size;
+
+        region_range.begin = MAX(region_range.begin, 0x1ULL << 32);
+
+        if (region_range.end - 1 >= region_range.begin) {
+            range_extend(range, &region_range);
+        }
+    }
+}
+
+void pci_bus_get_w64_range(PCIBus *bus, Range *range)
+{
+    range->begin = range->end = 0;
+    pci_for_each_device_under_bus(bus, pci_dev_get_w64, range);
+}
+
 static const TypeInfo pci_device_type_info = {
     .name = TYPE_PCI_DEVICE,
     .parent = TYPE_DEVICE,