pci_bus_is_root() currently relies on a method in the PCIBusClass.
But it's always known if a PCI bus is a root bus when we create it, so
using a dynamic method is overkill.
This replaces it with an IS_ROOT bit in a new flags field, which is set on
root buses and otherwise clear. As a bonus this removes the special
is_root logic from pci_expander_bridge, since it already creates its bus
as a root bus.
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
Reviewed-by: Marcel Apfelbaum <mar...@redhat.com>
Reviewed-by: Peter Xu <pet...@redhat.com>
---
hw/pci-bridge/pci_expander_bridge.c | 6 ------
hw/pci/pci.c | 14 ++------------
hw/virtio/virtio-pci.c | 1 +
include/hw/pci/pci.h | 1 -
include/hw/pci/pci_bus.h | 11 +++++++++++
5 files changed, 14 insertions(+), 19 deletions(-)
diff --git a/hw/pci-bridge/pci_expander_bridge.c
b/hw/pci-bridge/pci_expander_bridge.c
index e62de4218f..ca66bc721a 100644
--- a/hw/pci-bridge/pci_expander_bridge.c
+++ b/hw/pci-bridge/pci_expander_bridge.c
@@ -66,11 +66,6 @@ static int pxb_bus_num(PCIBus *bus)
return pxb->bus_nr;
}
-static bool pxb_is_root(PCIBus *bus)
-{
- return true; /* by definition */
-}
-
static uint16_t pxb_bus_numa_node(PCIBus *bus)
{
PXBDev *pxb = convert_to_pxb(bus->parent_dev);
@@ -83,7 +78,6 @@ static void pxb_bus_class_init(ObjectClass *class, void *data)
PCIBusClass *pbc = PCI_BUS_CLASS(class);
pbc->bus_num = pxb_bus_num;
- pbc->is_root = pxb_is_root;
pbc->numa_node = pxb_bus_numa_node;
}
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index c9fc2fbe19..f6d8b337db 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -129,14 +129,9 @@ static void pci_bus_unrealize(BusState *qbus, Error **errp)
vmstate_unregister(NULL, &vmstate_pcibus, bus);
}
-static bool pcibus_is_root(PCIBus *bus)
-{
- return !bus->parent_dev;
-}
-
static int pcibus_num(PCIBus *bus)
{
- if (pcibus_is_root(bus)) {
+ if (pci_bus_is_root(bus)) {
return 0; /* pci host bridge */
}
return bus->parent_dev->config[PCI_SECONDARY_BUS];
@@ -159,7 +154,6 @@ static void pci_bus_class_init(ObjectClass *klass, void
*data)
k->unrealize = pci_bus_unrealize;
k->reset = pcibus_reset;
- pbc->is_root = pcibus_is_root;
pbc->bus_num = pcibus_num;
pbc->numa_node = pcibus_numa_node;
}
@@ -379,6 +373,7 @@ static void pci_root_bus_init(PCIBus *bus, DeviceState
*parent,
bus->slot_reserved_mask = 0x0;
bus->address_space_mem = address_space_mem;
bus->address_space_io = address_space_io;
+ bus->flags |= PCI_BUS_IS_ROOT;
/* host bridge */
QLIST_INIT(&bus->child);
@@ -396,11 +391,6 @@ bool pci_bus_is_express(PCIBus *bus)
return object_dynamic_cast(OBJECT(bus), TYPE_PCIE_BUS);
}
-bool pci_bus_is_root(PCIBus *bus)
-{
- return PCI_BUS_GET_CLASS(bus)->is_root(bus);
-}
-
void pci_root_bus_new_inplace(PCIBus *bus, size_t bus_size, DeviceState
*parent,
const char *name,
MemoryRegion *address_space_mem,
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index e978bfe760..a3e43ebe31 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -20,6 +20,7 @@
#include "standard-headers/linux/virtio_pci.h"
#include "hw/virtio/virtio.h"
#include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/pci/msi.h"
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index d87f5f93e9..1273deb740 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -395,7 +395,6 @@ typedef PCIINTxRoute (*pci_route_irq_fn)(void *opaque, int
pin);
#define TYPE_PCIE_BUS "PCIE"
bool pci_bus_is_express(PCIBus *bus);
-bool pci_bus_is_root(PCIBus *bus);
void pci_root_bus_new_inplace(PCIBus *bus, size_t bus_size, DeviceState
*parent,
const char *name,
MemoryRegion *address_space_mem,
diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
index dfb75752cb..3a4d599da3 100644
--- a/include/hw/pci/pci_bus.h
+++ b/include/hw/pci/pci_bus.h
@@ -20,8 +20,14 @@ typedef struct PCIBusClass {
uint16_t (*numa_node)(PCIBus *bus);
} PCIBusClass;
+enum PCIBusFlags {
+ /* This bus is the root of a PCI domain */
+ PCI_BUS_IS_ROOT = 0x0001,
+};
+
struct PCIBus {
BusState qbus;
+ enum PCIBusFlags flags;
PCIIOMMUFunc iommu_fn;
void *iommu_opaque;
uint8_t devfn_min;
@@ -46,4 +52,9 @@ struct PCIBus {
Notifier machine_done;
};
+static inline bool pci_bus_is_root(PCIBus *bus)
+{
+ return !!(bus->flags & PCI_BUS_IS_ROOT);
+}
+
#endif /* QEMU_PCI_BUS_H */
--
2.20.1
