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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
262
263static void copy_mask(uint8_t *dst, uint8_t *src, uint16_t dst_len,
264 uint16_t src_len)
265{
266 int i;
267
268 for (i = 0; i < dst_len; i++) {
269 dst[i] = i < src_len ? src[i] : 0;
270 }
271}
272
273static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
274{
275 WriteEventMask *we_mask = (WriteEventMask *) sccb;
276 uint16_t mask_length = be16_to_cpu(we_mask->mask_length);
277 uint32_t tmp_mask;
278
279 if (!mask_length || (mask_length > SCLP_EVENT_MASK_LEN_MAX)) {
280 sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
281 goto out;
282 }
283
284
285
286
287
288
289
290
291 copy_mask((uint8_t *)&tmp_mask, WEM_CP_RECEIVE_MASK(we_mask, mask_length),
292 sizeof(tmp_mask), mask_length);
293 ef->receive_mask = be32_to_cpu(tmp_mask);
294
295
296 tmp_mask = cpu_to_be32(get_host_receive_mask(ef));
297 copy_mask(WEM_RECEIVE_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
298 mask_length, sizeof(tmp_mask));
299 tmp_mask = cpu_to_be32(get_host_send_mask(ef));
300 copy_mask(WEM_SEND_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
301 mask_length, sizeof(tmp_mask));
302
303 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
304
305out:
306 return;
307}
308
309
310
311#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
312
313static void sclp_events_bus_realize(BusState *bus, Error **errp)
314{
315 BusChild *kid;
316
317
318 QTAILQ_FOREACH(kid, &bus->children, sibling) {
319 DeviceState *dev = kid->child;
320
321 object_property_set_bool(OBJECT(dev), true, "realized", errp);
322 if (*errp) {
323 return;
324 }
325 }
326}
327
328static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
329{
330 BusClass *bc = BUS_CLASS(klass);
331
332 bc->realize = sclp_events_bus_realize;
333}
334
335static const TypeInfo sclp_events_bus_info = {
336 .name = TYPE_SCLP_EVENTS_BUS,
337 .parent = TYPE_BUS,
338 .class_init = sclp_events_bus_class_init,
339};
340
341static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
342{
343 switch (code & SCLP_CMD_CODE_MASK) {
344 case SCLP_CMD_READ_EVENT_DATA:
345 read_event_data(ef, sccb);
346 break;
347 case SCLP_CMD_WRITE_EVENT_DATA:
348 write_event_data(ef, sccb);
349 break;
350 case SCLP_CMD_WRITE_EVENT_MASK:
351 write_event_mask(ef, sccb);
352 break;
353 default:
354 sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
355 break;
356 }
357}
358
359static const VMStateDescription vmstate_event_facility = {
360 .name = "vmstate-event-facility",
361 .version_id = 0,
362 .minimum_version_id = 0,
363 .fields = (VMStateField[]) {
364 VMSTATE_UINT32(receive_mask, SCLPEventFacility),
365 VMSTATE_END_OF_LIST()
366 }
367};
368
369static void init_event_facility(Object *obj)
370{
371 SCLPEventFacility *event_facility = EVENT_FACILITY(obj);
372 DeviceState *sdev = DEVICE(obj);
373 Object *new;
374
375
376 qbus_create_inplace(&event_facility->sbus, sizeof(event_facility->sbus),
377 TYPE_SCLP_EVENTS_BUS, sdev, NULL);
378
379 new = object_new(TYPE_SCLP_QUIESCE);
380 object_property_add_child(obj, TYPE_SCLP_QUIESCE, new, NULL);
381 object_unref(new);
382 qdev_set_parent_bus(DEVICE(new), &event_facility->sbus.qbus);
383
384 new = object_new(TYPE_SCLP_CPU_HOTPLUG);
385 object_property_add_child(obj, TYPE_SCLP_CPU_HOTPLUG, new, NULL);
386 object_unref(new);
387 qdev_set_parent_bus(DEVICE(new), &event_facility->sbus.qbus);
388
389}
390
391static void reset_event_facility(DeviceState *dev)
392{
393 SCLPEventFacility *sdev = EVENT_FACILITY(dev);
394
395 sdev->receive_mask = 0;
396}
397
398static void init_event_facility_class(ObjectClass *klass, void *data)
399{
400 SysBusDeviceClass *sbdc = SYS_BUS_DEVICE_CLASS(klass);
401 DeviceClass *dc = DEVICE_CLASS(sbdc);
402 SCLPEventFacilityClass *k = EVENT_FACILITY_CLASS(dc);
403
404 dc->reset = reset_event_facility;
405 dc->vmsd = &vmstate_event_facility;
406 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
407 k->command_handler = command_handler;
408 k->event_pending = event_pending;
409}
410
411static const TypeInfo sclp_event_facility_info = {
412 .name = TYPE_SCLP_EVENT_FACILITY,
413 .parent = TYPE_SYS_BUS_DEVICE,
414 .instance_init = init_event_facility,
415 .instance_size = sizeof(SCLPEventFacility),
416 .class_init = init_event_facility_class,
417 .class_size = sizeof(SCLPEventFacilityClass),
418};
419
420static void event_realize(DeviceState *qdev, Error **errp)
421{
422 SCLPEvent *event = SCLP_EVENT(qdev);
423 SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
424
425 if (child->init) {
426 int rc = child->init(event);
427 if (rc < 0) {
428 error_setg(errp, "SCLP event initialization failed.");
429 return;
430 }
431 }
432}
433
434static void event_unrealize(DeviceState *qdev, Error **errp)
435{
436 SCLPEvent *event = SCLP_EVENT(qdev);
437 SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
438 if (child->exit) {
439 int rc = child->exit(event);
440 if (rc < 0) {
441 error_setg(errp, "SCLP event exit failed.");
442 return;
443 }
444 }
445}
446
447static void event_class_init(ObjectClass *klass, void *data)
448{
449 DeviceClass *dc = DEVICE_CLASS(klass);
450
451 dc->bus_type = TYPE_SCLP_EVENTS_BUS;
452 dc->realize = event_realize;
453 dc->unrealize = event_unrealize;
454}
455
456static const TypeInfo sclp_event_type_info = {
457 .name = TYPE_SCLP_EVENT,
458 .parent = TYPE_DEVICE,
459 .instance_size = sizeof(SCLPEvent),
460 .class_init = event_class_init,
461 .class_size = sizeof(SCLPEventClass),
462 .abstract = true,
463};
464
465static void register_types(void)
466{
467 type_register_static(&sclp_events_bus_info);
468 type_register_static(&sclp_event_facility_info);
469 type_register_static(&sclp_event_type_info);
470}
471
472type_init(register_types)
473
