s390x/3270: Add abstract emulated ccw-attached 3270 device

This introduces the infrastructure for the emulated 3270
devices, which will be attached to the virtual-css-bus.

Signed-off-by: Yang Chen <bjcyang@linux.vnet.ibm.com>
Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Reviewed-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/3270-ccw.c

@@ -0,0 +1,99 @@
+/*
+ * Emulated ccw-attached 3270 implementation
+ *
+ * Copyright 2017 IBM Corp.
+ * Author(s): Yang Chen <bjcyang@linux.vnet.ibm.com>
+ *            Jing Liu <liujbjl@linux.vnet.ibm.com>
+ *
+ * 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 "qemu/module.h"
+#include "cpu.h"
+#include "hw/s390x/css.h"
+#include "hw/s390x/css-bridge.h"
+#include "hw/s390x/3270-ccw.h"
+
+static void emulated_ccw_3270_realize(DeviceState *ds, Error **errp)
+{
+    uint16_t chpid;
+    EmulatedCcw3270Device *dev = EMULATED_CCW_3270(ds);
+    EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
+    CcwDevice *cdev = CCW_DEVICE(ds);
+    CCWDeviceClass *cdk = CCW_DEVICE_GET_CLASS(cdev);
+    SubchDev *sch = css_create_virtual_sch(cdev->devno, errp);
+    Error *err = NULL;
+
+    if (!sch) {
+        return;
+    }
+
+    if (!ck->init) {
+        goto out_err;
+    }
+
+    sch->driver_data = dev;
+    cdev->sch = sch;
+    chpid = css_find_free_chpid(sch->cssid);
+
+    if (chpid > MAX_CHPID) {
+        error_setg(&err, "No available chpid to use.");
+        goto out_err;
+    }
+
+    sch->id.reserved = 0xff;
+    sch->id.cu_type = EMULATED_CCW_3270_CU_TYPE;
+    css_sch_build_virtual_schib(sch, (uint8_t)chpid,
+                                EMULATED_CCW_3270_CHPID_TYPE);
+
+    ck->init(dev, &err);
+    if (err) {
+        goto out_err;
+    }
+
+    cdk->realize(cdev, &err);
+    if (err) {
+        goto out_err;
+    }
+
+    return;
+
+out_err:
+    error_propagate(errp, err);
+    css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
+    cdev->sch = NULL;
+    g_free(sch);
+}
+
+static Property emulated_ccw_3270_properties[] = {
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void emulated_ccw_3270_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->props = emulated_ccw_3270_properties;
+    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
+    dc->realize = emulated_ccw_3270_realize;
+    dc->hotpluggable = false;
+}
+
+static const TypeInfo emulated_ccw_3270_info = {
+    .name = TYPE_EMULATED_CCW_3270,
+    .parent = TYPE_CCW_DEVICE,
+    .instance_size = sizeof(EmulatedCcw3270Device),
+    .class_init = emulated_ccw_3270_class_init,
+    .class_size = sizeof(EmulatedCcw3270Class),
+    .abstract = true,
+};
+
+static void emulated_ccw_register(void)
+{
+    type_register_static(&emulated_ccw_3270_info);
+}
+
+type_init(emulated_ccw_register)

hw/s390x/Makefile.objs

@@ -7,6 +7,7 @@ obj-y += sclpcpu.o
 obj-y += ipl.o
 obj-y += css.o
 obj-y += s390-virtio-ccw.o
+obj-y += 3270-ccw.o
 obj-y += virtio-ccw.o
 obj-y += css-bridge.o
 obj-y += ccw-device.o

include/hw/s390x/3270-ccw.h

@@ -0,0 +1,44 @@
+/*
+ * Emulated ccw-attached 3270 definitions
+ *
+ * Copyright 2017 IBM Corp.
+ * Author(s): Yang Chen <bjcyang@linux.vnet.ibm.com>
+ *            Jing Liu <liujbjl@linux.vnet.ibm.com>
+ *
+ * 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.
+ */
+
+#ifndef HW_S390X_3270_CCW_H
+#define HW_S390X_3270_CCW_H
+
+#include "hw/sysbus.h"
+#include "hw/s390x/css.h"
+#include "hw/s390x/ccw-device.h"
+
+#define EMULATED_CCW_3270_CU_TYPE 0x3270
+#define EMULATED_CCW_3270_CHPID_TYPE 0x1a
+
+#define TYPE_EMULATED_CCW_3270 "emulated-ccw-3270"
+#define EMULATED_CCW_3270(obj) \
+     OBJECT_CHECK(EmulatedCcw3270Device, (obj), TYPE_EMULATED_CCW_3270)
+#define EMULATED_CCW_3270_CLASS(klass) \
+     OBJECT_CLASS_CHECK(EmulatedCcw3270Class, (klass), TYPE_EMULATED_CCW_3270)
+#define EMULATED_CCW_3270_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(EmulatedCcw3270Class, (obj), TYPE_EMULATED_CCW_3270)
+
+typedef struct EmulatedCcw3270Device {
+    CcwDevice parent_obj;
+} EmulatedCcw3270Device;
+
+typedef struct EmulatedCcw3270Class {
+    CCWDeviceClass parent_class;
+
+    void (*init)(EmulatedCcw3270Device *, Error **);
+    int (*read_payload_3270)(EmulatedCcw3270Device *, uint32_t, uint16_t);
+    int (*write_payload_3270)(EmulatedCcw3270Device *, uint8_t, uint32_t,
+                              uint16_t);
+} EmulatedCcw3270Class;
+
+#endif