xref: /openbmc/qemu/hw/intc/s390_flic.c (revision b03d9970c49d8f09f6e86130b320a91888667689) 
1 /*
2  * QEMU S390x floating interrupt controller (flic)
3  *
4  * Copyright 2014 IBM Corp.
5  * Author(s): Jens Freimann <jfrei@linux.vnet.ibm.com>
6  *            Cornelia Huck <cornelia.huck@de.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 "qemu/error-report.h"
15 #include "hw/sysbus.h"
16 #include "hw/s390x/ioinst.h"
17 #include "hw/s390x/s390_flic.h"
18 #include "hw/s390x/css.h"
19 #include "trace.h"
20 #include "cpu.h"
21 #include "hw/qdev.h"
22 #include "qapi/error.h"
23 #include "hw/s390x/s390-virtio-ccw.h"
24 
25 S390FLICState *s390_get_flic(void)
26 {
27     static S390FLICState *fs;
28 
29     if (!fs) {
30         fs = S390_FLIC_COMMON(object_resolve_path_type("",
31                                                        TYPE_S390_FLIC_COMMON,
32                                                        NULL));
33     }
34     return fs;
35 }
36 
37 void s390_flic_init(void)
38 {
39     DeviceState *dev;
40 
41     if (kvm_enabled()) {
42         dev = qdev_create(NULL, TYPE_KVM_S390_FLIC);
43         object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
44                                   OBJECT(dev), NULL);
45     } else {
46         dev = qdev_create(NULL, TYPE_QEMU_S390_FLIC);
47         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
48                                   OBJECT(dev), NULL);
49     }
50     qdev_init_nofail(dev);
51 }
52 
53 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
54                                          uint8_t isc, bool swap,
55                                          bool is_maskable, uint8_t flags)
56 {
57     /* nothing to do */
58     return 0;
59 }
60 
61 static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
62                                     uint64_t map_addr, bool do_map)
63 {
64     /* nothing to do */
65     return 0;
66 }
67 
68 static int qemu_s390_add_adapter_routes(S390FLICState *fs,
69                                         AdapterRoutes *routes)
70 {
71     return -ENOSYS;
72 }
73 
74 static void qemu_s390_release_adapter_routes(S390FLICState *fs,
75                                              AdapterRoutes *routes)
76 {
77 }
78 
79 static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
80                            uint16_t subchannel_nr)
81 {
82     /* Fixme TCG */
83     return -ENOSYS;
84 }
85 
86 static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
87                                      uint16_t mode)
88 {
89     QEMUS390FLICState *flic  = QEMU_S390_FLIC(fs);
90 
91     switch (mode) {
92     case SIC_IRQ_MODE_ALL:
93         flic->simm &= ~AIS_MODE_MASK(isc);
94         flic->nimm &= ~AIS_MODE_MASK(isc);
95         break;
96     case SIC_IRQ_MODE_SINGLE:
97         flic->simm |= AIS_MODE_MASK(isc);
98         flic->nimm &= ~AIS_MODE_MASK(isc);
99         break;
100     default:
101         return -EINVAL;
102     }
103 
104     return 0;
105 }
106 
107 static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
108                                  uint8_t isc, uint8_t flags)
109 {
110     QEMUS390FLICState *flic = QEMU_S390_FLIC(fs);
111     bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
112     uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
113 
114     if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
115         trace_qemu_s390_airq_suppressed(type, isc);
116         return 0;
117     }
118 
119     s390_io_interrupt(0, 0, 0, io_int_word);
120 
121     if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
122         flic->nimm |= AIS_MODE_MASK(isc);
123         trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
124                                       "NO-Interruptions Mode");
125     }
126 
127     return 0;
128 }
129 
130 static void qemu_s390_flic_reset(DeviceState *dev)
131 {
132     QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
133 
134     flic->simm = 0;
135     flic->nimm = 0;
136 }
137 
138 bool ais_needed(void *opaque)
139 {
140     S390FLICState *s = opaque;
141 
142     return s->ais_supported;
143 }
144 
145 static const VMStateDescription qemu_s390_flic_vmstate = {
146     .name = "qemu-s390-flic",
147     .version_id = 1,
148     .minimum_version_id = 1,
149     .needed = ais_needed,
150     .fields = (VMStateField[]) {
151         VMSTATE_UINT8(simm, QEMUS390FLICState),
152         VMSTATE_UINT8(nimm, QEMUS390FLICState),
153         VMSTATE_END_OF_LIST()
154     }
155 };
156 
157 static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
158 {
159     DeviceClass *dc = DEVICE_CLASS(oc);
160     S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
161 
162     dc->reset = qemu_s390_flic_reset;
163     dc->vmsd = &qemu_s390_flic_vmstate;
164     fsc->register_io_adapter = qemu_s390_register_io_adapter;
165     fsc->io_adapter_map = qemu_s390_io_adapter_map;
166     fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
167     fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
168     fsc->clear_io_irq = qemu_s390_clear_io_flic;
169     fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
170     fsc->inject_airq = qemu_s390_inject_airq;
171 }
172 
173 static Property s390_flic_common_properties[] = {
174     DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
175                        adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
176     DEFINE_PROP_END_OF_LIST(),
177 };
178 
179 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
180 {
181     S390FLICState *fs = S390_FLIC_COMMON(dev);
182     uint32_t max_batch = fs->adapter_routes_max_batch;
183 
184     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
185         error_setg(errp, "flic property adapter_routes_max_batch too big"
186                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
187         return;
188     }
189 
190     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
191 }
192 
193 static void s390_flic_class_init(ObjectClass *oc, void *data)
194 {
195     DeviceClass *dc = DEVICE_CLASS(oc);
196 
197     dc->props = s390_flic_common_properties;
198     dc->realize = s390_flic_common_realize;
199 }
200 
201 static const TypeInfo qemu_s390_flic_info = {
202     .name          = TYPE_QEMU_S390_FLIC,
203     .parent        = TYPE_S390_FLIC_COMMON,
204     .instance_size = sizeof(QEMUS390FLICState),
205     .class_init    = qemu_s390_flic_class_init,
206 };
207 
208 
209 static const TypeInfo s390_flic_common_info = {
210     .name          = TYPE_S390_FLIC_COMMON,
211     .parent        = TYPE_SYS_BUS_DEVICE,
212     .instance_size = sizeof(S390FLICState),
213     .class_init    = s390_flic_class_init,
214     .class_size    = sizeof(S390FLICStateClass),
215 };
216 
217 static void qemu_s390_flic_register_types(void)
218 {
219     type_register_static(&s390_flic_common_info);
220     type_register_static(&qemu_s390_flic_info);
221 }
222 
223 type_init(qemu_s390_flic_register_types)
224 
225 static bool adapter_info_so_needed(void *opaque)
226 {
227     return css_migration_enabled();
228 }
229 
230 const VMStateDescription vmstate_adapter_info_so = {
231     .name = "s390_adapter_info/summary_offset",
232     .version_id = 1,
233     .minimum_version_id = 1,
234     .needed = adapter_info_so_needed,
235     .fields = (VMStateField[]) {
236         VMSTATE_UINT32(summary_offset, AdapterInfo),
237         VMSTATE_END_OF_LIST()
238     }
239 };
240 
241 const VMStateDescription vmstate_adapter_info = {
242     .name = "s390_adapter_info",
243     .version_id = 1,
244     .minimum_version_id = 1,
245     .fields = (VMStateField[]) {
246         VMSTATE_UINT64(ind_offset, AdapterInfo),
247         /*
248          * We do not have to migrate neither the id nor the addresses.
249          * The id is set by css_register_io_adapter and the addresses
250          * are set based on the IndAddr objects after those get mapped.
251          */
252         VMSTATE_END_OF_LIST()
253     },
254     .subsections = (const VMStateDescription * []) {
255         &vmstate_adapter_info_so,
256         NULL
257     }
258 };
259 
260 const VMStateDescription vmstate_adapter_routes = {
261 
262     .name = "s390_adapter_routes",
263     .version_id = 1,
264     .minimum_version_id = 1,
265     .fields = (VMStateField[]) {
266         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
267                        AdapterInfo),
268         VMSTATE_END_OF_LIST()
269     }
270 };
271