s390x: use enum for adapter type and standardize its naming

Let's use an enum for io adapter type, and standardize its naming to
CSS_IO_ADAPTER_* by changing S390_PCIPT_ADAPTER to CSS_IO_ADAPTER_PCI.
Signed-off-by: NFei Li <sherrylf@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/css.c

@@ -155,7 +155,7 @@ int css_create_css_image(uint8_t cssid, bool default_image)
     return 0;
 }
 
-int css_register_io_adapter(uint8_t type, uint8_t isc, bool swap,
+int css_register_io_adapter(CssIoAdapterType type, uint8_t isc, bool swap,
                             bool maskable, uint32_t *id)
 {
     IoAdapter *adapter;

hw/s390x/s390-pci-bus.h

@@ -30,7 +30,6 @@
 #define FH_MASK_INDEX    0x0000ffff
 #define FH_SHM_VFIO      0x00010000
 #define FH_SHM_EMUL      0x00020000
-#define S390_PCIPT_ADAPTER 2
 #define ZPCI_MAX_FID 0xffffffff
 #define ZPCI_MAX_UID 0xffff
 #define UID_UNDEFINED 0

hw/s390x/s390-pci-inst.c

@@ -734,7 +734,7 @@ static int reg_irqs(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib)
 {
     int ret, len;
 
-    ret = css_register_io_adapter(S390_PCIPT_ADAPTER,
+    ret = css_register_io_adapter(CSS_IO_ADAPTER_PCI,
                                   FIB_DATA_ISC(ldl_p(&fib.data)), true, false,
                                   &pbdev->routes.adapter.adapter_id);
     assert(ret == 0);

include/hw/s390x/css.h

@@ -124,8 +124,13 @@ void css_generate_css_crws(uint8_t cssid);
 void css_clear_sei_pending(void);
 void css_adapter_interrupt(uint8_t isc);
 
-#define CSS_IO_ADAPTER_VIRTIO 1
-int css_register_io_adapter(uint8_t type, uint8_t isc, bool swap,
+typedef enum {
+    CSS_IO_ADAPTER_VIRTIO = 0,
+    CSS_IO_ADAPTER_PCI = 1,
+    CSS_IO_ADAPTER_TYPE_NUMS,
+} CssIoAdapterType;
+
+int css_register_io_adapter(CssIoAdapterType type, uint8_t isc, bool swap,
                             bool maskable, uint32_t *id);
 
 #ifndef CONFIG_USER_ONLY