xref: /openbmc/qemu/hw/intc/s390_flic.c (revision e2ac12f014ef1524e51d76bc0a282239d4f138f3) 
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_KVM_S390_FLIC, NULL));
31         if (!fs) {
32             fs = S390_FLIC_COMMON(object_resolve_path(TYPE_QEMU_S390_FLIC,
33                                                       NULL));
34         }
35     }
36     return fs;
37 }
38 
39 void s390_flic_init(void)
40 {
41     DeviceState *dev;
42 
43     if (kvm_enabled()) {
44         dev = qdev_create(NULL, TYPE_KVM_S390_FLIC);
45         object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
46                                   OBJECT(dev), NULL);
47     } else {
48         dev = qdev_create(NULL, TYPE_QEMU_S390_FLIC);
49         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
50                                   OBJECT(dev), NULL);
51     }
52     qdev_init_nofail(dev);
53 }
54 
55 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
56                                          uint8_t isc, bool swap,
57                                          bool is_maskable, uint8_t flags)
58 {
59     /* nothing to do */
60     return 0;
61 }
62 
63 static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
64                                     uint64_t map_addr, bool do_map)
65 {
66     /* nothing to do */
67     return 0;
68 }
69 
70 static int qemu_s390_add_adapter_routes(S390FLICState *fs,
71                                         AdapterRoutes *routes)
72 {
73     return -ENOSYS;
74 }
75 
76 static void qemu_s390_release_adapter_routes(S390FLICState *fs,
77                                              AdapterRoutes *routes)
78 {
79 }
80 
81 static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
82                            uint16_t subchannel_nr)
83 {
84     /* Fixme TCG */
85     return -ENOSYS;
86 }
87 
88 static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
89                                      uint16_t mode)
90 {
91     QEMUS390FLICState *flic  = QEMU_S390_FLIC(fs);
92 
93     switch (mode) {
94     case SIC_IRQ_MODE_ALL:
95         flic->simm &= ~AIS_MODE_MASK(isc);
96         flic->nimm &= ~AIS_MODE_MASK(isc);
97         break;
98     case SIC_IRQ_MODE_SINGLE:
99         flic->simm |= AIS_MODE_MASK(isc);
100         flic->nimm &= ~AIS_MODE_MASK(isc);
101         break;
102     default:
103         return -EINVAL;
104     }
105 
106     return 0;
107 }
108 
109 static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
110                                  uint8_t isc, uint8_t flags)
111 {
112     QEMUS390FLICState *flic = QEMU_S390_FLIC(fs);
113     bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
114     uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
115 
116     if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
117         trace_qemu_s390_airq_suppressed(type, isc);
118         return 0;
119     }
120 
121     s390_io_interrupt(0, 0, 0, io_int_word);
122 
123     if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
124         flic->nimm |= AIS_MODE_MASK(isc);
125         trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
126                                       "NO-Interruptions Mode");
127     }
128 
129     return 0;
130 }
131 
132 static void qemu_s390_flic_reset(DeviceState *dev)
133 {
134     QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
135 
136     flic->simm = 0;
137     flic->nimm = 0;
138 }
139 
140 bool ais_needed(void *opaque)
141 {
142     S390FLICState *s = opaque;
143 
144     return s->ais_supported;
145 }
146 
147 static const VMStateDescription qemu_s390_flic_vmstate = {
148     .name = "qemu-s390-flic",
149     .version_id = 1,
150     .minimum_version_id = 1,
151     .needed = ais_needed,
152     .fields = (VMStateField[]) {
153         VMSTATE_UINT8(simm, QEMUS390FLICState),
154         VMSTATE_UINT8(nimm, QEMUS390FLICState),
155         VMSTATE_END_OF_LIST()
156     }
157 };
158 
159 static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
160 {
161     DeviceClass *dc = DEVICE_CLASS(oc);
162     S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
163 
164     dc->reset = qemu_s390_flic_reset;
165     dc->vmsd = &qemu_s390_flic_vmstate;
166     fsc->register_io_adapter = qemu_s390_register_io_adapter;
167     fsc->io_adapter_map = qemu_s390_io_adapter_map;
168     fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
169     fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
170     fsc->clear_io_irq = qemu_s390_clear_io_flic;
171     fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
172     fsc->inject_airq = qemu_s390_inject_airq;
173 }
174 
175 static Property s390_flic_common_properties[] = {
176     DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
177                        adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
178     DEFINE_PROP_END_OF_LIST(),
179 };
180 
181 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
182 {
183     S390FLICState *fs = S390_FLIC_COMMON(dev);
184     uint32_t max_batch = fs->adapter_routes_max_batch;
185 
186     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
187         error_setg(errp, "flic property adapter_routes_max_batch too big"
188                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
189         return;
190     }
191 
192     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
193 }
194 
195 static void s390_flic_class_init(ObjectClass *oc, void *data)
196 {
197     DeviceClass *dc = DEVICE_CLASS(oc);
198 
199     dc->props = s390_flic_common_properties;
200     dc->realize = s390_flic_common_realize;
201 }
202 
203 static const TypeInfo qemu_s390_flic_info = {
204     .name          = TYPE_QEMU_S390_FLIC,
205     .parent        = TYPE_S390_FLIC_COMMON,
206     .instance_size = sizeof(QEMUS390FLICState),
207     .class_init    = qemu_s390_flic_class_init,
208 };
209 
210 
211 static const TypeInfo s390_flic_common_info = {
212     .name          = TYPE_S390_FLIC_COMMON,
213     .parent        = TYPE_SYS_BUS_DEVICE,
214     .instance_size = sizeof(S390FLICState),
215     .class_init    = s390_flic_class_init,
216     .class_size    = sizeof(S390FLICStateClass),
217 };
218 
219 static void qemu_s390_flic_register_types(void)
220 {
221     type_register_static(&s390_flic_common_info);
222     type_register_static(&qemu_s390_flic_info);
223 }
224 
225 type_init(qemu_s390_flic_register_types)
226 
227 static bool adapter_info_so_needed(void *opaque)
228 {
229     return css_migration_enabled();
230 }
231 
232 const VMStateDescription vmstate_adapter_info_so = {
233     .name = "s390_adapter_info/summary_offset",
234     .version_id = 1,
235     .minimum_version_id = 1,
236     .needed = adapter_info_so_needed,
237     .fields = (VMStateField[]) {
238         VMSTATE_UINT32(summary_offset, AdapterInfo),
239         VMSTATE_END_OF_LIST()
240     }
241 };
242 
243 const VMStateDescription vmstate_adapter_info = {
244     .name = "s390_adapter_info",
245     .version_id = 1,
246     .minimum_version_id = 1,
247     .fields = (VMStateField[]) {
248         VMSTATE_UINT64(ind_offset, AdapterInfo),
249         /*
250          * We do not have to migrate neither the id nor the addresses.
251          * The id is set by css_register_io_adapter and the addresses
252          * are set based on the IndAddr objects after those get mapped.
253          */
254         VMSTATE_END_OF_LIST()
255     },
256     .subsections = (const VMStateDescription * []) {
257         &vmstate_adapter_info_so,
258         NULL
259     }
260 };
261 
262 const VMStateDescription vmstate_adapter_routes = {
263 
264     .name = "s390_adapter_routes",
265     .version_id = 1,
266     .minimum_version_id = 1,
267     .fields = (VMStateField[]) {
268         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
269                        AdapterInfo),
270         VMSTATE_END_OF_LIST()
271     }
272 };
273