s390x/ap: base Adjunct Processor (AP) object model

Introduces the base object model for virtualizing AP devices.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Tested-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20181010170309.12045-5-akrowiak@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/hw/s390x/ap-bridge.c b/hw/s390x/ap-bridge.c
new file mode 100644
index 0000000..3795d30
--- /dev/null
+++ b/hw/s390x/ap-bridge.c
@@ -0,0 +1,78 @@
+/*
+ * ap bridge
+ *
+ * Copyright 2018 IBM Corp.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "qemu/bitops.h"
+#include "hw/s390x/ap-bridge.h"
+#include "cpu.h"
+
+static char *ap_bus_get_dev_path(DeviceState *dev)
+{
+    /* at most one */
+    return g_strdup_printf("/1");
+}
+
+static void ap_bus_class_init(ObjectClass *oc, void *data)
+{
+    BusClass *k = BUS_CLASS(oc);
+
+    k->get_dev_path = ap_bus_get_dev_path;
+    /* More than one ap device does not make sense */
+    k->max_dev = 1;
+}
+
+static const TypeInfo ap_bus_info = {
+    .name = TYPE_AP_BUS,
+    .parent = TYPE_BUS,
+    .instance_size = 0,
+    .class_init = ap_bus_class_init,
+};
+
+void s390_init_ap(void)
+{
+    DeviceState *dev;
+
+    /* If no AP instructions then no need for AP bridge */
+    if (!s390_has_feat(S390_FEAT_AP)) {
+        return;
+    }
+
+    /* Create bridge device */
+    dev = qdev_create(NULL, TYPE_AP_BRIDGE);
+    object_property_add_child(qdev_get_machine(), TYPE_AP_BRIDGE,
+                              OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
+
+    /* Create bus on bridge device */
+    qbus_create(TYPE_AP_BUS, dev, TYPE_AP_BUS);
+ }
+
+static void ap_bridge_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+}
+
+static const TypeInfo ap_bridge_info = {
+    .name          = TYPE_AP_BRIDGE,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = 0,
+    .class_init    = ap_bridge_class_init,
+};
+
+static void ap_register(void)
+{
+    type_register_static(&ap_bridge_info);
+    type_register_static(&ap_bus_info);
+}
+
+type_init(ap_register)