pci: Define pci_bus_dev_fn/pci_bus_fn/pci_bus_ret_fn

They're used in quite a few places of pci.[ch] and also in the rest of the code
base.  Define them so that it doesn't need to be defined all over the places.

The pci_bus_fn is similar to pci_bus_dev_fn that only takes a PCIBus* and an
opaque.  The pci_bus_ret_fn is similar to pci_bus_fn but it allows to return a
void* pointer.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20211028043129.38871-2-peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 15 insertions, 24 deletions

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 186758ee11..17e59cb3a3 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1655,9 +1655,7 @@ static const pci_class_desc pci_class_descriptions[] =
 };
 
 static void pci_for_each_device_under_bus_reverse(PCIBus *bus,
-                                                  void (*fn)(PCIBus *b,
-                                                             PCIDevice *d,
-                                                             void *opaque),
+                                                  pci_bus_dev_fn fn,
                                                   void *opaque)
 {
     PCIDevice *d;
@@ -1672,8 +1670,7 @@ static void pci_for_each_device_under_bus_reverse(PCIBus *bus,
 }
 
 void pci_for_each_device_reverse(PCIBus *bus, int bus_num,
-                         void (*fn)(PCIBus *b, PCIDevice *d, void *opaque),
-                         void *opaque)
+                                 pci_bus_dev_fn fn, void *opaque)
 {
     bus = pci_find_bus_nr(bus, bus_num);
 
@@ -1683,9 +1680,7 @@ void pci_for_each_device_reverse(PCIBus *bus, int bus_num,
 }
 
 static void pci_for_each_device_under_bus(PCIBus *bus,
-                                          void (*fn)(PCIBus *b, PCIDevice *d,
-                                                     void *opaque),
-                                          void *opaque)
+                                          pci_bus_dev_fn fn, void *opaque)
 {
     PCIDevice *d;
     int devfn;
@@ -1699,8 +1694,7 @@ static void pci_for_each_device_under_bus(PCIBus *bus,
 }
 
 void pci_for_each_device(PCIBus *bus, int bus_num,
-                         void (*fn)(PCIBus *b, PCIDevice *d, void *opaque),
-                         void *opaque)
+                         pci_bus_dev_fn fn, void *opaque)
 {
     bus = pci_find_bus_nr(bus, bus_num);
 
@@ -2078,10 +2072,8 @@ static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num)
     return NULL;
 }
 
-void pci_for_each_bus_depth_first(PCIBus *bus,
-                                  void *(*begin)(PCIBus *bus, void *parent_state),
-                                  void (*end)(PCIBus *bus, void *state),
-                                  void *parent_state)
+void pci_for_each_bus_depth_first(PCIBus *bus, pci_bus_ret_fn begin,
+                                  pci_bus_fn end, void *parent_state)
 {
     PCIBus *sec;
     void *state;
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 7fc90132cf..4a8740b76b 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -401,6 +401,10 @@ typedef PCIINTxRoute (*pci_route_irq_fn)(void *opaque, int pin);
 OBJECT_DECLARE_TYPE(PCIBus, PCIBusClass, PCI_BUS)
 #define TYPE_PCIE_BUS "PCIE"
 
+typedef void (*pci_bus_dev_fn)(PCIBus *b, PCIDevice *d, void *opaque);
+typedef void (*pci_bus_fn)(PCIBus *b, void *opaque);
+typedef void *(*pci_bus_ret_fn)(PCIBus *b, void *opaque);
+
 bool pci_bus_is_express(PCIBus *bus);
 
 void pci_root_bus_init(PCIBus *bus, size_t bus_size, DeviceState *parent,
@@ -458,23 +462,18 @@ static inline int pci_dev_bus_num(const PCIDevice *dev)
 
 int pci_bus_numa_node(PCIBus *bus);
 void pci_for_each_device(PCIBus *bus, int bus_num,
-                         void (*fn)(PCIBus *bus, PCIDevice *d, void *opaque),
+                         pci_bus_dev_fn fn,
                          void *opaque);
 void pci_for_each_device_reverse(PCIBus *bus, int bus_num,
-                                 void (*fn)(PCIBus *bus, PCIDevice *d,
-                                            void *opaque),
+                                 pci_bus_dev_fn fn,
                                  void *opaque);
-void pci_for_each_bus_depth_first(PCIBus *bus,
-                                  void *(*begin)(PCIBus *bus, void *parent_state),
-                                  void (*end)(PCIBus *bus, void *state),
-                                  void *parent_state);
+void pci_for_each_bus_depth_first(PCIBus *bus, pci_bus_ret_fn begin,
+                                  pci_bus_fn end, void *parent_state);
 PCIDevice *pci_get_function_0(PCIDevice *pci_dev);
 
 /* Use this wrapper when specific scan order is not required. */
 static inline
-void pci_for_each_bus(PCIBus *bus,
-                      void (*fn)(PCIBus *bus, void *opaque),
-                      void *opaque)
+void pci_for_each_bus(PCIBus *bus, pci_bus_fn fn, void *opaque)
 {
     pci_for_each_bus_depth_first(bus, NULL, fn, opaque);
 }