pci: Add pci_dev_bus_num() helper

A fair proportion of the users of pci_bus_num() want to get the bus
number on a specific device, so first have to look up the bus from the
device then call it.  This adds a helper to do that (since we're going
to make looking up the bus slightly more verbose).
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com>
Reviewed-by: NPeter Xu <peterx@redhat.com>

hw/pci/pcie_aer.c

@@ -1025,7 +1025,7 @@ static int do_pcie_aer_inject_error(Monitor *mon,
     }
     details->id = id;
     details->root_bus = pci_root_bus_path(dev);
-    details->bus = pci_bus_num(dev->bus);
+    details->bus = pci_dev_bus_num(dev);
     details->devfn = dev->devfn;
 
     return 0;

hw/s390x/s390-pci-bus.c

@@ -692,7 +692,7 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
             /* In the case the PCI device does not define an id */
             /* we generate one based on the PCI address         */
             dev->id = g_strdup_printf("auto_%02x:%02x.%01x",
-                                      pci_bus_num(pdev->bus),
+                                      pci_dev_bus_num(pdev),
                                       PCI_SLOT(pdev->devfn),
                                       PCI_FUNC(pdev->devfn));
         }

hw/scsi/megasas.c

@@ -2372,7 +2372,7 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
     if (!s->sas_addr) {
         s->sas_addr = ((NAA_LOCALLY_ASSIGNED_ID << 24) |
                        IEEE_COMPANY_LOCALLY_ASSIGNED) << 36;
-        s->sas_addr |= (pci_bus_num(dev->bus) << 16);
+        s->sas_addr |= (pci_dev_bus_num(dev) << 16);
         s->sas_addr |= (PCI_SLOT(dev->devfn) << 8);
         s->sas_addr |= PCI_FUNC(dev->devfn);
     }

hw/scsi/mptsas.c

@@ -1312,7 +1312,7 @@ static void mptsas_scsi_realize(PCIDevice *dev, Error **errp)
     if (!s->sas_addr) {
         s->sas_addr = ((NAA_LOCALLY_ASSIGNED_ID << 24) |
                        IEEE_COMPANY_LOCALLY_ASSIGNED) << 36;
-        s->sas_addr |= (pci_bus_num(dev->bus) << 16);
+        s->sas_addr |= (pci_dev_bus_num(dev) << 16);
         s->sas_addr |= (PCI_SLOT(dev->devfn) << 8);
         s->sas_addr |= PCI_FUNC(dev->devfn);
     }

hw/xen/xen_pt.c

@@ -73,7 +73,7 @@ void xen_pt_log(const PCIDevice *d, const char *f, ...)
 
     va_start(ap, f);
     if (d) {
-        fprintf(stderr, "[%02x:%02x.%d] ", pci_bus_num(d->bus),
+        fprintf(stderr, "[%02x:%02x.%d] ", pci_dev_bus_num(d),
                 PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
     }
     vfprintf(stderr, f, ap);
@@ -711,7 +711,7 @@ static void xen_pt_destroy(PCIDevice *d) {
         intx = xen_pt_pci_intx(s);
         rc = xc_domain_unbind_pt_irq(xen_xc, xen_domid, machine_irq,
                                      PT_IRQ_TYPE_PCI,
-                                     pci_bus_num(d->bus),
+                                     pci_dev_bus_num(d),
                                      PCI_SLOT(s->dev.devfn),
                                      intx,
                                      0 /* isa_irq */);
@@ -867,7 +867,7 @@ static void xen_pt_realize(PCIDevice *d, Error **errp)
         uint8_t e_intx = xen_pt_pci_intx(s);
 
         rc = xc_domain_bind_pt_pci_irq(xen_xc, xen_domid, machine_irq,
-                                       pci_bus_num(d->bus),
+                                       pci_dev_bus_num(d),
                                        PCI_SLOT(d->devfn),
                                        e_intx);
         if (rc < 0) {

include/hw/pci/pci.h

@@ -436,6 +436,11 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
 PCIDevice *pci_vga_init(PCIBus *bus);
 
 int pci_bus_num(PCIBus *s);
+static inline int pci_dev_bus_num(const PCIDevice *dev)
+{
+    return pci_bus_num(dev->bus);
+}
+
 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),

include/hw/xen/xen_common.h

@@ -542,10 +542,10 @@ static inline void xen_map_pcidev(domid_t dom,
         return;
     }
 
-    trace_xen_map_pcidev(ioservid, pci_bus_num(pci_dev->bus),
+    trace_xen_map_pcidev(ioservid, pci_dev_bus_num(pci_dev),
                          PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
     xendevicemodel_map_pcidev_to_ioreq_server(xen_dmod, dom, ioservid, 0,
-                                              pci_bus_num(pci_dev->bus),
+                                              pci_dev_bus_num(pci_dev),
                                               PCI_SLOT(pci_dev->devfn),
                                               PCI_FUNC(pci_dev->devfn));
 }
@@ -558,10 +558,10 @@ static inline void xen_unmap_pcidev(domid_t dom,
         return;
     }
 
-    trace_xen_unmap_pcidev(ioservid, pci_bus_num(pci_dev->bus),
+    trace_xen_unmap_pcidev(ioservid, pci_dev_bus_num(pci_dev),
                            PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
     xendevicemodel_unmap_pcidev_from_ioreq_server(xen_dmod, dom, ioservid, 0,
-                                                  pci_bus_num(pci_dev->bus),
+                                                  pci_dev_bus_num(pci_dev),
                                                   PCI_SLOT(pci_dev->devfn),
                                                   PCI_FUNC(pci_dev->devfn));
 }