ahci: add ahci_get_num_ports

Instead of reaching into the PCI state, allow the AHCIDevice to
respond with how many ports it has.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20170623220926.11479-2-jsnow@redhat.com
Signed-off-by: NJohn Snow <jsnow@redhat.com>

hw/i386/pc_q35.c

@@ -242,8 +242,8 @@ static void pc_q35_init(MachineState *machine)
                                                true, "ich9-ahci");
         idebus[0] = qdev_get_child_bus(&ahci->qdev, "ide.0");
         idebus[1] = qdev_get_child_bus(&ahci->qdev, "ide.1");
-        g_assert(MAX_SATA_PORTS == ICH_AHCI(ahci)->ahci.ports);
-        ide_drive_get(hd, ICH_AHCI(ahci)->ahci.ports);
+        g_assert(MAX_SATA_PORTS == ahci_get_num_ports(ahci));
+        ide_drive_get(hd, ahci_get_num_ports(ahci));
         ahci_ide_create_devs(ahci, hd);
     } else {
         idebus[0] = idebus[1] = NULL;

hw/ide/ahci.c

@@ -1833,6 +1833,14 @@ static void sysbus_ahci_register_types(void)
 
 type_init(sysbus_ahci_register_types)
 
+int32_t ahci_get_num_ports(PCIDevice *dev)
+{
+    AHCIPCIState *d = ICH_AHCI(dev);
+    AHCIState *ahci = &d->ahci;
+
+    return ahci->ports;
+}
+
 void ahci_ide_create_devs(PCIDevice *dev, DriveInfo **hd)
 {
     AHCIPCIState *d = ICH_AHCI(dev);

hw/mips/boston.c

@@ -538,8 +538,8 @@ static void boston_mach_init(MachineState *machine)
     ahci = pci_create_simple_multifunction(&PCI_BRIDGE(&pcie2->root)->sec_bus,
                                            PCI_DEVFN(0, 0),
                                            true, TYPE_ICH9_AHCI);
-    g_assert(ARRAY_SIZE(hd) == ICH_AHCI(ahci)->ahci.ports);
-    ide_drive_get(hd, ICH_AHCI(ahci)->ahci.ports);
+    g_assert(ARRAY_SIZE(hd) == ahci_get_num_ports(ahci));
+    ide_drive_get(hd, ahci_get_num_ports(ahci));
     ahci_ide_create_devs(ahci, hd);
 
     if (machine->firmware) {

include/hw/ide/ahci.h

@@ -372,6 +372,7 @@ void ahci_uninit(AHCIState *s);
 
 void ahci_reset(AHCIState *s);
 
+int32_t ahci_get_num_ports(PCIDevice *dev);
 void ahci_ide_create_devs(PCIDevice *dev, DriveInfo **hd);
 
 #define TYPE_SYSBUS_AHCI "sysbus-ahci"