ppc/pnv: Introduce PnvMachineClass and PnvMachineClass::compat

The pnv_dt_create() function generates different contents for the
"compatible" property of the root node in the DT, depending on the
CPU type. This is open coded with multiple ifs using pnv_is_powerXX()
helpers.

It seems cleaner to achieve with QOM. Introduce a base class for the
powernv machine and a compat attribute that each child class can use
to provide the value for the "compatible" property.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157623839085.360005.4046508784077843216.stgit@bahia.lan>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[dwg: Folded in small fix Greg spotted after posting]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/pnv.c

@@ -484,9 +484,7 @@ static void pnv_dt_power_mgt(void *fdt)
 
 static void *pnv_dt_create(MachineState *machine)
 {
-    const char plat_compat8[] = "qemu,powernv8\0qemu,powernv\0ibm,powernv";
+    PnvMachineClass *pmc = PNV_MACHINE_GET_CLASS(machine);
-    const char plat_compat9[] = "qemu,powernv9\0ibm,powernv";
-    const char plat_compat10[] = "qemu,powernv10\0ibm,powernv";
     PnvMachineState *pnv = PNV_MACHINE(machine);
     void *fdt;
     char *buf;
@@ -504,17 +502,7 @@ static void *pnv_dt_create(MachineState *machine)
     _FDT((fdt_setprop_cell(fdt, 0, "#size-cells", 0x2)));
     _FDT((fdt_setprop_string(fdt, 0, "model",
                              "IBM PowerNV (emulated by qemu)")));
-    if (pnv_is_power10(pnv)) {
+    _FDT((fdt_setprop(fdt, 0, "compatible", pmc->compat, pmc->compat_size)));
-        _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat10,
-                          sizeof(plat_compat10))));
-    } else if (pnv_is_power9(pnv)) {
-        _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat9,
-                          sizeof(plat_compat9))));
-    } else {
-        _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat8,
-                          sizeof(plat_compat8))));
-    }
-
 
     buf =  qemu_uuid_unparse_strdup(&qemu_uuid);
     _FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
@@ -1692,6 +1680,8 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
     XICSFabricClass *xic = XICS_FABRIC_CLASS(oc);
+    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
+    static const char compat[] = "qemu,powernv8\0qemu,powernv\0ibm,powernv";
 
     mc->desc = "IBM PowerNV (Non-Virtualized) POWER8";
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0");
@@ -1699,26 +1689,39 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
     xic->icp_get = pnv_icp_get;
     xic->ics_get = pnv_ics_get;
     xic->ics_resend = pnv_ics_resend;
+
+    pmc->compat = compat;
+    pmc->compat_size = sizeof(compat);
 }
 
 static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
     XiveFabricClass *xfc = XIVE_FABRIC_CLASS(oc);
+    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
+    static const char compat[] = "qemu,powernv9\0ibm,powernv";
 
     mc->desc = "IBM PowerNV (Non-Virtualized) POWER9";
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power9_v2.0");
     xfc->match_nvt = pnv_match_nvt;
 
     mc->alias = "powernv";
+
+    pmc->compat = compat;
+    pmc->compat_size = sizeof(compat);
 }
 
 static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
+    static const char compat[] = "qemu,powernv10\0ibm,powernv";
 
     mc->desc = "IBM PowerNV (Non-Virtualized) POWER10";
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power10_v1.0");
+
+    pmc->compat = compat;
+    pmc->compat_size = sizeof(compat);
 }
 
 static void pnv_machine_class_init(ObjectClass *oc, void *data)
@@ -1796,6 +1799,7 @@ static const TypeInfo types[] = {
         .instance_size = sizeof(PnvMachineState),
         .instance_init = pnv_machine_instance_init,
         .class_init    = pnv_machine_class_init,
+        .class_size    = sizeof(PnvMachineClass),
         .interfaces = (InterfaceInfo[]) {
             { TYPE_INTERRUPT_STATS_PROVIDER },
             { },

include/hw/ppc/pnv.h

@@ -185,6 +185,19 @@ PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir);
 #define TYPE_PNV_MACHINE       MACHINE_TYPE_NAME("powernv")
 #define PNV_MACHINE(obj) \
     OBJECT_CHECK(PnvMachineState, (obj), TYPE_PNV_MACHINE)
+#define PNV_MACHINE_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(PnvMachineClass, obj, TYPE_PNV_MACHINE)
+#define PNV_MACHINE_CLASS(klass) \
+    OBJECT_CLASS_CHECK(PnvMachineClass, klass, TYPE_PNV_MACHINE)
+
+typedef struct PnvMachineClass {
+    /*< private >*/
+    MachineClass parent_class;
+
+    /*< public >*/
+    const char *compat;
+    int compat_size;
+} PnvMachineClass;
 
 typedef struct PnvMachineState {
     /*< private >*/