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18#include "qemu/osdep.h"
19#include "qapi/error.h"
20#include "sysemu/sysemu.h"
21
22#include "hw/s390x/sclp.h"
23#include "hw/s390x/event-facility.h"
24
25typedef struct SCLPEventsBus {
26 BusState qbus;
27} SCLPEventsBus;
28
29struct SCLPEventFacility {
30 SysBusDevice parent_obj;
31 SCLPEventsBus sbus;
32
33 unsigned int receive_mask;
34};
35
36
37static bool event_pending(SCLPEventFacility *ef)
38{
39 BusChild *kid;
40 SCLPEvent *event;
41 SCLPEventClass *event_class;
42
43 QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
44 DeviceState *qdev = kid->child;
45 event = DO_UPCAST(SCLPEvent, qdev, qdev);
46 event_class = SCLP_EVENT_GET_CLASS(event);
47 if (event->event_pending &&
48 event_class->get_send_mask() & ef->receive_mask) {
49 return true;
50 }
51 }
52 return false;
53}
54
55static unsigned int get_host_send_mask(SCLPEventFacility *ef)
56{
57 unsigned int mask;
58 BusChild *kid;
59 SCLPEventClass *child;
60
61 mask = 0;
62
63 QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
64 DeviceState *qdev = kid->child;
65 child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
66 mask |= child->get_send_mask();
67 }
68 return mask;
69}
70
71static unsigned int get_host_receive_mask(SCLPEventFacility *ef)
72{
73 unsigned int mask;
74 BusChild *kid;
75 SCLPEventClass *child;
76
77 mask = 0;
78
79 QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
80 DeviceState *qdev = kid->child;
81 child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
82 mask |= child->get_receive_mask();
83 }
84 return mask;
85}
86
87static uint16_t write_event_length_check(SCCB *sccb)
88{
89 int slen;
90 unsigned elen = 0;
91 EventBufferHeader *event;
92 WriteEventData *wed = (WriteEventData *) sccb;
93
94 event = (EventBufferHeader *) &wed->ebh;
95 for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
96 elen = be16_to_cpu(event->length);
97 if (elen < sizeof(*event) || elen > slen) {
98 return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
99 }
100 event = (void *) event + elen;
101 }
102 if (slen) {
103 return SCLP_RC_INCONSISTENT_LENGTHS;
104 }
105 return SCLP_RC_NORMAL_COMPLETION;
106}
107
108static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
109 EventBufferHeader *event_buf, SCCB *sccb)
110{
111 uint16_t rc;
112 BusChild *kid;
113 SCLPEvent *event;
114 SCLPEventClass *ec;
115
116 rc = SCLP_RC_INVALID_FUNCTION;
117
118 QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
119 DeviceState *qdev = kid->child;
120 event = (SCLPEvent *) qdev;
121 ec = SCLP_EVENT_GET_CLASS(event);
122
123 if (ec->write_event_data &&
124 ec->can_handle_event(event_buf->type)) {
125 rc = ec->write_event_data(event, event_buf);
126 break;
127 }
128 }
129 return rc;
130}
131
132static uint16_t handle_sccb_write_events(SCLPEventFacility *ef, SCCB *sccb)
133{
134 uint16_t rc;
135 int slen;
136 unsigned elen = 0;
137 EventBufferHeader *event_buf;
138 WriteEventData *wed = (WriteEventData *) sccb;
139
140 event_buf = &wed->ebh;
141 rc = SCLP_RC_NORMAL_COMPLETION;
142
143
144 for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
145 elen = be16_to_cpu(event_buf->length);
146
147
148
149 if (rc != SCLP_RC_NORMAL_COMPLETION) {
150 event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
151 } else {
152 rc = handle_write_event_buf(ef, event_buf, sccb);
153 }
154 event_buf = (void *) event_buf + elen;
155 }
156 return rc;
157}
158
159static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
160{
161 if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
162 sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
163 goto out;
164 }
165 if (be16_to_cpu(sccb->h.length) < 8) {
166 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
167 goto out;
168 }
169
170 sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));
171
172
173 if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
174 sccb->h.response_code =
175 cpu_to_be16(handle_sccb_write_events(ef, sccb));
176 }
177
178out:
179 return;
180}
181
182static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
183 unsigned int mask)
184{
185 uint16_t rc;
186 int slen;
187 unsigned elen;
188 BusChild *kid;
189 SCLPEvent *event;
190 SCLPEventClass *ec;
191 EventBufferHeader *event_buf;
192 ReadEventData *red = (ReadEventData *) sccb;
193
194 event_buf = &red->ebh;
195 event_buf->length = 0;
196 slen = sizeof(sccb->data);
197
198 rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;
199
200 QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
201 DeviceState *qdev = kid->child;
202 event = (SCLPEvent *) qdev;
203 ec = SCLP_EVENT_GET_CLASS(event);
204
205 if (mask & ec->get_send_mask()) {
206 if (ec->read_event_data(event, event_buf, &slen)) {
207 elen = be16_to_cpu(event_buf->length);
208 event_buf = (EventBufferHeader *) ((char *)event_buf + elen);
209 rc = SCLP_RC_NORMAL_COMPLETION;
210 }
211 }
212 }
213
214 if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
215
216 sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
217
218 sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
219 }
220 return rc;
221}
222
223static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
224{
225 unsigned int sclp_active_selection_mask;
226 unsigned int sclp_cp_receive_mask;
227
228 ReadEventData *red = (ReadEventData *) sccb;
229
230 if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
231 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
232 goto out;
233 }
234
235 sclp_cp_receive_mask = ef->receive_mask;
236
237
238 switch (sccb->h.function_code) {
239 case SCLP_UNCONDITIONAL_READ:
240 sclp_active_selection_mask = sclp_cp_receive_mask;
241 break;
242 case SCLP_SELECTIVE_READ:
243 sclp_active_selection_mask = be32_to_cpu(red->mask);
244 if (!sclp_cp_receive_mask ||
245 (sclp_active_selection_mask & ~sclp_cp_receive_mask)) {
246 sccb->h.response_code =
247 cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
248 goto out;
249 }
250 break;
251 default:
252 sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
253 goto out;
254 }
255 sccb->h.response_code = cpu_to_be16(
256 handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
257
258out:
259 return;
260}
261
262static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
263{
264 WriteEventMask *we_mask = (WriteEventMask *) sccb;
265
266
267
268 if (be16_to_cpu(we_mask->mask_length) != 4) {
269 sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
270 goto out;
271 }
272
273
274 ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);
275
276
277 we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
278 we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));
279
280 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
281
282out:
283 return;
284}
285
286
287
288#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
289
290static void sclp_events_bus_realize(BusState *bus, Error **errp)
291{
292 BusChild *kid;
293
294
295 QTAILQ_FOREACH(kid, &bus->children, sibling) {
296 DeviceState *dev = kid->child;
297
298 object_property_set_bool(OBJECT(dev), true, "realized", errp);
299 if (*errp) {
300 return;
301 }
302 }
303}
304
305static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
306{
307 BusClass *bc = BUS_CLASS(klass);
308
309 bc->realize = sclp_events_bus_realize;
310}
311
312static const TypeInfo sclp_events_bus_info = {
313 .name = TYPE_SCLP_EVENTS_BUS,
314 .parent = TYPE_BUS,
315 .class_init = sclp_events_bus_class_init,
316};
317
318static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
319{
320 switch (code & SCLP_CMD_CODE_MASK) {
321 case SCLP_CMD_READ_EVENT_DATA:
322 read_event_data(ef, sccb);
323 break;
324 case SCLP_CMD_WRITE_EVENT_DATA:
325 write_event_data(ef, sccb);
326 break;
327 case SCLP_CMD_WRITE_EVENT_MASK:
328 write_event_mask(ef, sccb);
329 break;
330 default:
331 sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
332 break;
333 }
334}
335
336static const VMStateDescription vmstate_event_facility = {
337 .name = "vmstate-event-facility",
338 .version_id = 0,
339 .minimum_version_id = 0,
340 .fields = (VMStateField[]) {
341 VMSTATE_UINT32(receive_mask, SCLPEventFacility),
342 VMSTATE_END_OF_LIST()
343 }
344};
345
346static void init_event_facility(Object *obj)
347{
348 SCLPEventFacility *event_facility = EVENT_FACILITY(obj);
349 DeviceState *sdev = DEVICE(obj);
350 Object *new;
351
352
353 qbus_create_inplace(&event_facility->sbus, sizeof(event_facility->sbus),
354 TYPE_SCLP_EVENTS_BUS, sdev, NULL);
355
356 new = object_new(TYPE_SCLP_QUIESCE);
357 object_property_add_child(obj, TYPE_SCLP_QUIESCE, new, NULL);
358 object_unref(new);
359 qdev_set_parent_bus(DEVICE(new), &event_facility->sbus.qbus);
360
361 new = object_new(TYPE_SCLP_CPU_HOTPLUG);
362 object_property_add_child(obj, TYPE_SCLP_CPU_HOTPLUG, new, NULL);
363 object_unref(new);
364 qdev_set_parent_bus(DEVICE(new), &event_facility->sbus.qbus);
365
366}
367
368static void reset_event_facility(DeviceState *dev)
369{
370 SCLPEventFacility *sdev = EVENT_FACILITY(dev);
371
372 sdev->receive_mask = 0;
373}
374
375static void init_event_facility_class(ObjectClass *klass, void *data)
376{
377 SysBusDeviceClass *sbdc = SYS_BUS_DEVICE_CLASS(klass);
378 DeviceClass *dc = DEVICE_CLASS(sbdc);
379 SCLPEventFacilityClass *k = EVENT_FACILITY_CLASS(dc);
380
381 dc->reset = reset_event_facility;
382 dc->vmsd = &vmstate_event_facility;
383 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
384 k->command_handler = command_handler;
385 k->event_pending = event_pending;
386}
387
388static const TypeInfo sclp_event_facility_info = {
389 .name = TYPE_SCLP_EVENT_FACILITY,
390 .parent = TYPE_SYS_BUS_DEVICE,
391 .instance_init = init_event_facility,
392 .instance_size = sizeof(SCLPEventFacility),
393 .class_init = init_event_facility_class,
394 .class_size = sizeof(SCLPEventFacilityClass),
395};
396
397static void event_realize(DeviceState *qdev, Error **errp)
398{
399 SCLPEvent *event = SCLP_EVENT(qdev);
400 SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
401
402 if (child->init) {
403 int rc = child->init(event);
404 if (rc < 0) {
405 error_setg(errp, "SCLP event initialization failed.");
406 return;
407 }
408 }
409}
410
411static void event_unrealize(DeviceState *qdev, Error **errp)
412{
413 SCLPEvent *event = SCLP_EVENT(qdev);
414 SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
415 if (child->exit) {
416 int rc = child->exit(event);
417 if (rc < 0) {
418 error_setg(errp, "SCLP event exit failed.");
419 return;
420 }
421 }
422}
423
424static void event_class_init(ObjectClass *klass, void *data)
425{
426 DeviceClass *dc = DEVICE_CLASS(klass);
427
428 dc->bus_type = TYPE_SCLP_EVENTS_BUS;
429 dc->realize = event_realize;
430 dc->unrealize = event_unrealize;
431}
432
433static const TypeInfo sclp_event_type_info = {
434 .name = TYPE_SCLP_EVENT,
435 .parent = TYPE_DEVICE,
436 .instance_size = sizeof(SCLPEvent),
437 .class_init = event_class_init,
438 .class_size = sizeof(SCLPEventClass),
439 .abstract = true,
440};
441
442static void register_types(void)
443{
444 type_register_static(&sclp_events_bus_info);
445 type_register_static(&sclp_event_facility_info);
446 type_register_static(&sclp_event_type_info);
447}
448
449type_init(register_types)
450
