[Xen-devel] [v2][PATCH 2/8] pci: provide a way to reserve some specific devfn

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

Sometime we may need to reserve some specific devfn since
some vgabios or drivers have to work well with a fixed bdf.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
v2:

* New patch

 hw/pci/pci.c         | 11 +++++++++++
 include/hw/pci/pci.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index ef944cf..06b0c92 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -813,6 +813,17 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
     memory_region_destroy(&pci_dev->bus_master_enable_region);
 }
 
+
+void pci_reserve_pci_devfn(PCIBus *bus, uint8_t devfn)
+{
+    int ret = test_and_set_bit(devfn, bus->pci_bdf_bitmap);
+    if (ret) {
+        error_report("PCI: %02x:%02x:%02x is not available to reserve.",
+                    pci_bus_num(bus), PCI_SLOT(devfn), PCI_FUNC(devfn));
+        return;
+    }
+}
+
 /* -1 for devfn means auto assign */
 static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
                                          const char *name, int devfn)
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 8c25ae5..cbb174e 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -342,6 +342,7 @@ void pci_bus_new_inplace(PCIBus *bus, size_t bus_size, 
DeviceState *parent,
                          MemoryRegion *address_space_mem,
                          MemoryRegion *address_space_io,
                          uint8_t devfn_min, const char *typename);
+void pci_reserve_pci_devfn(PCIBus *bus, uint8_t devfn);
 PCIBus *pci_bus_new(DeviceState *parent, const char *name,
                     MemoryRegion *address_space_mem,
                     MemoryRegion *address_space_io,
-- 
1.9.1


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