Merge remote-tracking branch 'remotes/stsquad/tags/pull-for-7.0-180122-2' into staging
[qemu.git] / hw / s390x / css-bridge.c
1 /*
2 * css bridge implementation
3 *
4 * Copyright 2012,2016 IBM Corp.
5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
6 * Pierre Morel <pmorel@linux.vnet.ibm.com>
7 *
8 * This work is licensed under the terms of the GNU GPL, version 2 or (at
9 * your option) any later version. See the COPYING file in the top-level
10 * directory.
11 */
12
13 #include "qemu/osdep.h"
14 #include "qapi/error.h"
15 #include "hw/hotplug.h"
16 #include "hw/qdev-properties.h"
17 #include "hw/sysbus.h"
18 #include "qemu/bitops.h"
19 #include "qemu/module.h"
20 #include "hw/s390x/css.h"
21 #include "ccw-device.h"
22 #include "hw/s390x/css-bridge.h"
23
24 /*
25 * Invoke device-specific unplug handler, disable the subchannel
26 * (including sending a channel report to the guest) and remove the
27 * device from the virtual css bus.
28 */
29 static void ccw_device_unplug(HotplugHandler *hotplug_dev,
30 DeviceState *dev, Error **errp)
31 {
32 CcwDevice *ccw_dev = CCW_DEVICE(dev);
33 CCWDeviceClass *k = CCW_DEVICE_GET_CLASS(ccw_dev);
34 SubchDev *sch = ccw_dev->sch;
35 Error *err = NULL;
36
37 if (k->unplug) {
38 k->unplug(hotplug_dev, dev, &err);
39 if (err) {
40 error_propagate(errp, err);
41 return;
42 }
43 }
44
45 /*
46 * We should arrive here only for device_del, since we don't support
47 * direct hot(un)plug of channels.
48 */
49 assert(sch != NULL);
50 /* Subchannel is now disabled and no longer valid. */
51 sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA |
52 PMCW_FLAGS_MASK_DNV);
53
54 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
55
56 qdev_unrealize(dev);
57 }
58
59 static void virtual_css_bus_reset(BusState *qbus)
60 {
61 /* This should actually be modelled via the generic css */
62 css_reset();
63 }
64
65 static char *virtual_css_bus_get_dev_path(DeviceState *dev)
66 {
67 CcwDevice *ccw_dev = CCW_DEVICE(dev);
68 SubchDev *sch = ccw_dev->sch;
69 VirtualCssBridge *bridge =
70 VIRTUAL_CSS_BRIDGE(qdev_get_parent_bus(dev)->parent);
71
72 /*
73 * We can't provide a dev path for backward compatibility on
74 * older machines, as it is visible in the migration stream.
75 */
76 return bridge->css_dev_path ?
77 g_strdup_printf("/%02x.%1x.%04x", sch->cssid, sch->ssid, sch->devno) :
78 NULL;
79 }
80
81 static void virtual_css_bus_class_init(ObjectClass *klass, void *data)
82 {
83 BusClass *k = BUS_CLASS(klass);
84
85 k->reset = virtual_css_bus_reset;
86 k->get_dev_path = virtual_css_bus_get_dev_path;
87 }
88
89 static const TypeInfo virtual_css_bus_info = {
90 .name = TYPE_VIRTUAL_CSS_BUS,
91 .parent = TYPE_BUS,
92 .instance_size = sizeof(VirtualCssBus),
93 .class_init = virtual_css_bus_class_init,
94 };
95
96 VirtualCssBus *virtual_css_bus_init(void)
97 {
98 VirtualCssBus *cbus;
99 BusState *bus;
100 DeviceState *dev;
101
102 /* Create bridge device */
103 dev = qdev_new(TYPE_VIRTUAL_CSS_BRIDGE);
104 object_property_add_child(qdev_get_machine(), TYPE_VIRTUAL_CSS_BRIDGE,
105 OBJECT(dev));
106 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
107
108 /* Create bus on bridge device */
109 bus = qbus_new(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css");
110 cbus = VIRTUAL_CSS_BUS(bus);
111
112 /* Enable hotplugging */
113 qbus_set_hotplug_handler(bus, OBJECT(dev));
114
115 css_register_io_adapters(CSS_IO_ADAPTER_VIRTIO, true, false,
116 0, &error_abort);
117
118 return cbus;
119 }
120
121 /***************** Virtual-css Bus Bridge Device ********************/
122
123 static Property virtual_css_bridge_properties[] = {
124 DEFINE_PROP_BOOL("css_dev_path", VirtualCssBridge, css_dev_path,
125 true),
126 DEFINE_PROP_END_OF_LIST(),
127 };
128
129 static bool prop_get_true(Object *obj, Error **errp)
130 {
131 return true;
132 }
133
134 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
135 {
136 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
137 DeviceClass *dc = DEVICE_CLASS(klass);
138
139 hc->unplug = ccw_device_unplug;
140 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
141 device_class_set_props(dc, virtual_css_bridge_properties);
142 object_class_property_add_bool(klass, "cssid-unrestricted",
143 prop_get_true, NULL);
144 object_class_property_set_description(klass, "cssid-unrestricted",
145 "A css device can use any cssid, regardless whether virtual"
146 " or not (read only, always true)");
147 }
148
149 static const TypeInfo virtual_css_bridge_info = {
150 .name = TYPE_VIRTUAL_CSS_BRIDGE,
151 .parent = TYPE_SYS_BUS_DEVICE,
152 .instance_size = sizeof(VirtualCssBridge),
153 .class_init = virtual_css_bridge_class_init,
154 .interfaces = (InterfaceInfo[]) {
155 { TYPE_HOTPLUG_HANDLER },
156 { }
157 }
158 };
159
160 static void virtual_css_register(void)
161 {
162 type_register_static(&virtual_css_bridge_info);
163 type_register_static(&virtual_css_bus_info);
164 }
165
166 type_init(virtual_css_register)