xref: /openbmc/qemu/hw/intc/s390_flic.c (revision 0b1183e3) 
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     dev = s390_flic_kvm_create();
44     if (!dev) {
45         dev = qdev_create(NULL, TYPE_QEMU_S390_FLIC);
46         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
47                                   OBJECT(dev), NULL);
48     }
49     qdev_init_nofail(dev);
50 }
51 
52 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
53                                          uint8_t isc, bool swap,
54                                          bool is_maskable, uint8_t flags)
55 {
56     /* nothing to do */
57     return 0;
58 }
59 
60 static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
61                                     uint64_t map_addr, bool do_map)
62 {
63     /* nothing to do */
64     return 0;
65 }
66 
67 static int qemu_s390_add_adapter_routes(S390FLICState *fs,
68                                         AdapterRoutes *routes)
69 {
70     return -ENOSYS;
71 }
72 
73 static void qemu_s390_release_adapter_routes(S390FLICState *fs,
74                                              AdapterRoutes *routes)
75 {
76 }
77 
78 static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
79                            uint16_t subchannel_nr)
80 {
81     /* Fixme TCG */
82     return -ENOSYS;
83 }
84 
85 static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
86                                      uint16_t mode)
87 {
88     QEMUS390FLICState *flic  = QEMU_S390_FLIC(fs);
89 
90     switch (mode) {
91     case SIC_IRQ_MODE_ALL:
92         flic->simm &= ~AIS_MODE_MASK(isc);
93         flic->nimm &= ~AIS_MODE_MASK(isc);
94         break;
95     case SIC_IRQ_MODE_SINGLE:
96         flic->simm |= AIS_MODE_MASK(isc);
97         flic->nimm &= ~AIS_MODE_MASK(isc);
98         break;
99     default:
100         return -EINVAL;
101     }
102 
103     return 0;
104 }
105 
106 static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
107                                  uint8_t isc, uint8_t flags)
108 {
109     QEMUS390FLICState *flic = QEMU_S390_FLIC(fs);
110     bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
111     uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
112 
113     if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
114         trace_qemu_s390_airq_suppressed(type, isc);
115         return 0;
116     }
117 
118     s390_io_interrupt(0, 0, 0, io_int_word);
119 
120     if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
121         flic->nimm |= AIS_MODE_MASK(isc);
122         trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
123                                       "NO-Interruptions Mode");
124     }
125 
126     return 0;
127 }
128 
129 static void qemu_s390_flic_reset(DeviceState *dev)
130 {
131     QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
132 
133     flic->simm = 0;
134     flic->nimm = 0;
135 }
136 
137 bool ais_needed(void *opaque)
138 {
139     S390FLICState *s = opaque;
140 
141     return s->ais_supported;
142 }
143 
144 static const VMStateDescription qemu_s390_flic_vmstate = {
145     .name = "qemu-s390-flic",
146     .version_id = 1,
147     .minimum_version_id = 1,
148     .needed = ais_needed,
149     .fields = (VMStateField[]) {
150         VMSTATE_UINT8(simm, QEMUS390FLICState),
151         VMSTATE_UINT8(nimm, QEMUS390FLICState),
152         VMSTATE_END_OF_LIST()
153     }
154 };
155 
156 static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
157 {
158     DeviceClass *dc = DEVICE_CLASS(oc);
159     S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
160 
161     dc->reset = qemu_s390_flic_reset;
162     dc->vmsd = &qemu_s390_flic_vmstate;
163     fsc->register_io_adapter = qemu_s390_register_io_adapter;
164     fsc->io_adapter_map = qemu_s390_io_adapter_map;
165     fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
166     fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
167     fsc->clear_io_irq = qemu_s390_clear_io_flic;
168     fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
169     fsc->inject_airq = qemu_s390_inject_airq;
170 }
171 
172 static Property s390_flic_common_properties[] = {
173     DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
174                        adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
175     DEFINE_PROP_END_OF_LIST(),
176 };
177 
178 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
179 {
180     S390FLICState *fs = S390_FLIC_COMMON(dev);
181     uint32_t max_batch = fs->adapter_routes_max_batch;
182 
183     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
184         error_setg(errp, "flic property adapter_routes_max_batch too big"
185                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
186         return;
187     }
188 
189     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
190 }
191 
192 static void s390_flic_class_init(ObjectClass *oc, void *data)
193 {
194     DeviceClass *dc = DEVICE_CLASS(oc);
195 
196     dc->props = s390_flic_common_properties;
197     dc->realize = s390_flic_common_realize;
198 }
199 
200 static const TypeInfo qemu_s390_flic_info = {
201     .name          = TYPE_QEMU_S390_FLIC,
202     .parent        = TYPE_S390_FLIC_COMMON,
203     .instance_size = sizeof(QEMUS390FLICState),
204     .class_init    = qemu_s390_flic_class_init,
205 };
206 
207 
208 static const TypeInfo s390_flic_common_info = {
209     .name          = TYPE_S390_FLIC_COMMON,
210     .parent        = TYPE_SYS_BUS_DEVICE,
211     .instance_size = sizeof(S390FLICState),
212     .class_init    = s390_flic_class_init,
213     .class_size    = sizeof(S390FLICStateClass),
214 };
215 
216 static void qemu_s390_flic_register_types(void)
217 {
218     type_register_static(&s390_flic_common_info);
219     type_register_static(&qemu_s390_flic_info);
220 }
221 
222 type_init(qemu_s390_flic_register_types)
223 
224 static bool adapter_info_so_needed(void *opaque)
225 {
226     return css_migration_enabled();
227 }
228 
229 const VMStateDescription vmstate_adapter_info_so = {
230     .name = "s390_adapter_info/summary_offset",
231     .version_id = 1,
232     .minimum_version_id = 1,
233     .needed = adapter_info_so_needed,
234     .fields = (VMStateField[]) {
235         VMSTATE_UINT32(summary_offset, AdapterInfo),
236         VMSTATE_END_OF_LIST()
237     }
238 };
239 
240 const VMStateDescription vmstate_adapter_info = {
241     .name = "s390_adapter_info",
242     .version_id = 1,
243     .minimum_version_id = 1,
244     .fields = (VMStateField[]) {
245         VMSTATE_UINT64(ind_offset, AdapterInfo),
246         /*
247          * We do not have to migrate neither the id nor the addresses.
248          * The id is set by css_register_io_adapter and the addresses
249          * are set based on the IndAddr objects after those get mapped.
250          */
251         VMSTATE_END_OF_LIST()
252     },
253     .subsections = (const VMStateDescription * []) {
254         &vmstate_adapter_info_so,
255         NULL
256     }
257 };
258 
259 const VMStateDescription vmstate_adapter_routes = {
260 
261     .name = "s390_adapter_routes",
262     .version_id = 1,
263     .minimum_version_id = 1,
264     .fields = (VMStateField[]) {
265         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
266                        AdapterInfo),
267         VMSTATE_END_OF_LIST()
268     }
269 };
270