pci: avoid accessing slot_reserved_mask directly outside of pci.c

This patch provides accessor functions as replacements for direct
access to slot_reserved_mask according to the comment at the top
of include/hw/pci/pci_bus.h which advises that data structures for
PCIBus should not be directly accessed but instead be accessed using
accessor functions in pci.h.

Three accessor functions can conveniently replace all direct accesses
of slot_reserved_mask. With this patch, the new accessor functions are
used in hw/sparc64/sun4u.c and hw/xen/xen_pt.c and pci_bus.h is removed
from the included header files of the same two files.

No functional change intended.

Signed-off-by: Chuck Zmudzinski <brchuckz@aol.com>
Message-Id: <b1b7f134883cbc83e455abbe5ee225c71aa0e8d0.1678888385.git.brchuckz@aol.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> [sun4u]

4 files changed, 24 insertions, 8 deletions

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index def5000..8a87ccc 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1116,6 +1116,21 @@ static bool pci_bus_devfn_reserved(PCIBus *bus, int devfn)
     return bus->slot_reserved_mask & (1UL << PCI_SLOT(devfn));
 }
 
+uint32_t pci_bus_get_slot_reserved_mask(PCIBus *bus)
+{
+    return bus->slot_reserved_mask;
+}
+
+void pci_bus_set_slot_reserved_mask(PCIBus *bus, uint32_t mask)
+{
+    bus->slot_reserved_mask |= mask;
+}
+
+void pci_bus_clear_slot_reserved_mask(PCIBus *bus, uint32_t mask)
+{
+    bus->slot_reserved_mask &= ~mask;
+}
+
 /* -1 for devfn means auto assign */
 static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
                                          const char *name, int devfn,
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index a25e951..eae7589 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -31,7 +31,6 @@
 #include "hw/irq.h"
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_bridge.h"
-#include "hw/pci/pci_bus.h"
 #include "hw/pci/pci_host.h"
 #include "hw/qdev-properties.h"
 #include "hw/pci-host/sabre.h"
@@ -608,9 +607,9 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
     /* Only in-built Simba APBs can exist on the root bus, slot 0 on busA is
        reserved (leaving no slots free after on-board devices) however slots
        0-3 are free on busB */
-    pci_bus->slot_reserved_mask = 0xfffffffc;
-    pci_busA->slot_reserved_mask = 0xfffffff1;
-    pci_busB->slot_reserved_mask = 0xfffffff0;
+    pci_bus_set_slot_reserved_mask(pci_bus, 0xfffffffc);
+    pci_bus_set_slot_reserved_mask(pci_busA, 0xfffffff1);
+    pci_bus_set_slot_reserved_mask(pci_busB, 0xfffffff0);
 
     ebus = pci_new_multifunction(PCI_DEVFN(1, 0), true, TYPE_EBUS);
     qdev_prop_set_uint64(DEVICE(ebus), "console-serial-base",
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index 2d33d17..a540149 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -57,7 +57,6 @@
 #include <sys/ioctl.h>
 
 #include "hw/pci/pci.h"
-#include "hw/pci/pci_bus.h"
 #include "hw/qdev-properties.h"
 #include "hw/qdev-properties-system.h"
 #include "xen_pt.h"
@@ -951,7 +950,7 @@ void xen_igd_reserve_slot(PCIBus *pci_bus)
     }
 
     XEN_PT_LOG(0, "Reserving PCI slot 2 for IGD\n");
-    pci_bus->slot_reserved_mask |= XEN_PCI_IGD_SLOT_MASK;
+    pci_bus_set_slot_reserved_mask(pci_bus, XEN_PCI_IGD_SLOT_MASK);
 }
 
 static void xen_igd_clear_slot(DeviceState *qdev, Error **errp)
@@ -971,7 +970,7 @@ static void xen_igd_clear_slot(DeviceState *qdev, Error **errp)
         return;
     }
 
-    if (!(pci_bus->slot_reserved_mask & XEN_PCI_IGD_SLOT_MASK)) {
+    if (!(pci_bus_get_slot_reserved_mask(pci_bus) & XEN_PCI_IGD_SLOT_MASK)) {
         xpdc->pci_qdev_realize(qdev, errp);
         return;
     }
@@ -982,7 +981,7 @@ static void xen_igd_clear_slot(DeviceState *qdev, Error **errp)
         s->real_device.dev == XEN_PCI_IGD_DEV &&
         s->real_device.func == XEN_PCI_IGD_FN &&
         s->real_device.vendor_id == PCI_VENDOR_ID_INTEL) {
-        pci_bus->slot_reserved_mask &= ~XEN_PCI_IGD_SLOT_MASK;
+        pci_bus_clear_slot_reserved_mask(pci_bus, XEN_PCI_IGD_SLOT_MASK);
         XEN_PT_LOG(pci_dev, "Intel IGD found, using slot 2\n");
     }
     xpdc->pci_qdev_realize(qdev, errp);
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index d5a40cd..935b4b9 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -287,6 +287,9 @@ void pci_bus_irqs(PCIBus *bus, pci_set_irq_fn set_irq,
 void pci_bus_map_irqs(PCIBus *bus, pci_map_irq_fn map_irq);
 void pci_bus_irqs_cleanup(PCIBus *bus);
 int pci_bus_get_irq_level(PCIBus *bus, int irq_num);
+uint32_t pci_bus_get_slot_reserved_mask(PCIBus *bus);
+void pci_bus_set_slot_reserved_mask(PCIBus *bus, uint32_t mask);
+void pci_bus_clear_slot_reserved_mask(PCIBus *bus, uint32_t mask);
 /* 0 <= pin <= 3 0 = INTA, 1 = INTB, 2 = INTC, 3 = INTD */
 static inline int pci_swizzle(int slot, int pin)
 {