pci: Abolish pci_find_root_bus()

pci_find_root_bus() takes a domain parameter.  Currently PCI root buses
with domain other than 0 can't be created, so this is more or less a long
winded way of retrieving the main PCI root bus.  Numbered domains don't
actually properly cover the (non x86) possibilities for multiple PCI root
buses, so this patch for now enforces the domain == 0 restriction in other
places to replace pci_find_root_bus() with an explicit
pci_find_primary_bus().

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

3 files changed, 41 insertions, 14 deletions

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index e393022917..0276694b00 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -342,7 +342,7 @@ static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
 
     pc_init_pci(args);
 
-    bus = pci_find_root_bus(0);
+    bus = pci_find_primary_bus();
     if (bus != NULL) {
         pci_create_simple(bus, -1, "xen-platform");
     }
diff --git a/hw/pci/pci-hotplug-old.c b/hw/pci/pci-hotplug-old.c
index a0b5558789..7a47d6b0f0 100644
--- a/hw/pci/pci-hotplug-old.c
+++ b/hw/pci/pci-hotplug-old.c
@@ -36,17 +36,23 @@
 #include "sysemu/blockdev.h"
 #include "qapi/error.h"
 
-static int pci_read_devaddr(Monitor *mon, const char *addr, int *domp,
+static int pci_read_devaddr(Monitor *mon, const char *addr,
                             int *busp, unsigned *slotp)
 {
+    int dom;
+
     /* strip legacy tag */
     if (!strncmp(addr, "pci_addr=", 9)) {
         addr += 9;
     }
-    if (pci_parse_devaddr(addr, domp, busp, slotp, NULL)) {
+    if (pci_parse_devaddr(addr, &dom, busp, slotp, NULL)) {
         monitor_printf(mon, "Invalid pci address\n");
         return -1;
     }
+    if (dom != 0) {
+        monitor_printf(mon, "Multiple PCI domains not supported, use device_add\n");
+        return -1;
+    }
     return 0;
 }
 
@@ -128,18 +134,22 @@ static int scsi_hot_add(Monitor *mon, DeviceState *adapter,
 
 int pci_drive_hot_add(Monitor *mon, const QDict *qdict, DriveInfo *dinfo)
 {
-    int dom, pci_bus;
+    int pci_bus;
     unsigned slot;
+    PCIBus *root = pci_find_primary_bus();
     PCIDevice *dev;
     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 
     switch (dinfo->type) {
     case IF_SCSI:
-        if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
+        if (!root) {
+            monitor_printf(mon, "no primary PCI bus\n");
+            goto err;
+        }
+        if (pci_read_devaddr(mon, pci_addr, &pci_bus, &slot)) {
             goto err;
         }
-        dev = pci_find_device(pci_find_root_bus(dom), pci_bus,
-                              PCI_DEVFN(slot, 0));
+        dev = pci_find_device(root, pci_bus, PCI_DEVFN(slot, 0));
         if (!dev) {
             monitor_printf(mon, "no pci device with address %s\n", pci_addr);
             goto err;
@@ -275,16 +285,22 @@ void pci_device_hot_add(Monitor *mon, const QDict *qdict)
 
 static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 {
+    PCIBus *root = pci_find_primary_bus();
     PCIDevice *d;
-    int dom, bus;
+    int bus;
     unsigned slot;
     Error *local_err = NULL;
 
-    if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
+    if (!root) {
+        monitor_printf(mon, "no primary PCI bus\n");
+        return -1;
+    }
+
+    if (pci_read_devaddr(mon, pci_addr, &bus, &slot)) {
         return -1;
     }
 
-    d = pci_find_device(pci_find_root_bus(dom), bus, PCI_DEVFN(slot, 0));
+    d = pci_find_device(root, bus, PCI_DEVFN(slot, 0));
     if (!d) {
         monitor_printf(mon, "slot %d empty\n", slot);
         return -1;
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index adf4da5b95..fc99e3bf69 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -246,12 +246,12 @@ static void pci_host_bus_register(int domain, PCIBus *bus)
     QLIST_INSERT_HEAD(&host_buses, host, next);
 }
 
-PCIBus *pci_find_root_bus(int domain)
+PCIBus *pci_find_primary_bus(void)
 {
     struct PCIHostBus *host;
 
     QLIST_FOREACH(host, &host_buses, next) {
-        if (host->domain == domain) {
+        if (host->domain == 0) {
             return host->bus;
         }
     }
@@ -583,20 +583,31 @@ int pci_parse_devaddr(const char *addr, int *domp, int *busp,
 
 PCIBus *pci_get_bus_devfn(int *devfnp, const char *devaddr)
 {
+    PCIBus *root = pci_find_primary_bus();
     int dom, bus;
     unsigned slot;
 
+    if (!root) {
+        fprintf(stderr, "No primary PCI bus\n");
+        return NULL;
+    }
+
     if (!devaddr) {
         *devfnp = -1;
-        return pci_find_bus_nr(pci_find_root_bus(0), 0);
+        return pci_find_bus_nr(root, 0);
     }
 
     if (pci_parse_devaddr(devaddr, &dom, &bus, &slot, NULL) < 0) {
         return NULL;
     }
 
+    if (dom != 0) {
+        fprintf(stderr, "No support for non-zero PCI domains\n");
+        return NULL;
+    }
+
     *devfnp = PCI_DEVFN(slot, 0);
-    return pci_find_bus_nr(pci_find_root_bus(dom), bus);
+    return pci_find_bus_nr(root, bus);
 }
 
 static void pci_init_cmask(PCIDevice *dev)