xref: /openbmc/qemu/hw/intc/s390_flic.c (revision 9b089d25) 
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 "qemu/main-loop.h"
16 #include "qemu/module.h"
17 #include "hw/sysbus.h"
18 #include "hw/s390x/ioinst.h"
19 #include "hw/s390x/s390_flic.h"
20 #include "hw/qdev-properties.h"
21 #include "hw/s390x/css.h"
22 #include "trace.h"
23 #include "qapi/error.h"
24 #include "hw/s390x/s390-virtio-ccw.h"
25 
26 S390FLICStateClass *s390_get_flic_class(S390FLICState *fs)
27 {
28     static S390FLICStateClass *class;
29 
30     if (!class) {
31         /* we only have one flic device, so this is fine to cache */
32         class = S390_FLIC_COMMON_GET_CLASS(fs);
33     }
34     return class;
35 }
36 
37 QEMUS390FLICState *s390_get_qemu_flic(S390FLICState *fs)
38 {
39     static QEMUS390FLICState *flic;
40 
41     if (!flic) {
42         /* we only have one flic device, so this is fine to cache */
43         flic = QEMU_S390_FLIC(fs);
44     }
45     return flic;
46 }
47 
48 S390FLICState *s390_get_flic(void)
49 {
50     static S390FLICState *fs;
51 
52     if (!fs) {
53         fs = S390_FLIC_COMMON(object_resolve_path_type("",
54                                                        TYPE_S390_FLIC_COMMON,
55                                                        NULL));
56     }
57     return fs;
58 }
59 
60 void s390_flic_init(void)
61 {
62     DeviceState *dev;
63 
64     if (kvm_enabled()) {
65         dev = qdev_new(TYPE_KVM_S390_FLIC);
66         object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
67                                   OBJECT(dev));
68     } else {
69         dev = qdev_new(TYPE_QEMU_S390_FLIC);
70         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
71                                   OBJECT(dev));
72     }
73     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
74 }
75 
76 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
77                                          uint8_t isc, bool swap,
78                                          bool is_maskable, uint8_t flags)
79 {
80     /* nothing to do */
81     return 0;
82 }
83 
84 static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
85                                     uint64_t map_addr, bool do_map)
86 {
87     /* nothing to do */
88     return 0;
89 }
90 
91 static int qemu_s390_add_adapter_routes(S390FLICState *fs,
92                                         AdapterRoutes *routes)
93 {
94     return -ENOSYS;
95 }
96 
97 static void qemu_s390_release_adapter_routes(S390FLICState *fs,
98                                              AdapterRoutes *routes)
99 {
100 }
101 
102 static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
103                            uint16_t subchannel_nr)
104 {
105     QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
106     QEMUS390FlicIO *cur, *next;
107     uint8_t isc;
108 
109     g_assert(bql_locked());
110     if (!(flic->pending & FLIC_PENDING_IO)) {
111         return 0;
112     }
113 
114     /* check all iscs */
115     for (isc = 0; isc < 8; isc++) {
116         if (QLIST_EMPTY(&flic->io[isc])) {
117             continue;
118         }
119 
120         /* search and delete any matching one */
121         QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
122             if (cur->id == subchannel_id && cur->nr == subchannel_nr) {
123                 QLIST_REMOVE(cur, next);
124                 g_free(cur);
125             }
126         }
127 
128         /* update our indicator bit */
129         if (QLIST_EMPTY(&flic->io[isc])) {
130             flic->pending &= ~ISC_TO_PENDING_IO(isc);
131         }
132     }
133     return 0;
134 }
135 
136 static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
137                                      uint16_t mode)
138 {
139     QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
140 
141     switch (mode) {
142     case SIC_IRQ_MODE_ALL:
143         flic->simm &= ~AIS_MODE_MASK(isc);
144         flic->nimm &= ~AIS_MODE_MASK(isc);
145         break;
146     case SIC_IRQ_MODE_SINGLE:
147         flic->simm |= AIS_MODE_MASK(isc);
148         flic->nimm &= ~AIS_MODE_MASK(isc);
149         break;
150     default:
151         return -EINVAL;
152     }
153 
154     return 0;
155 }
156 
157 static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
158                                  uint8_t isc, uint8_t flags)
159 {
160     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
161     S390FLICStateClass *fsc = s390_get_flic_class(fs);
162     bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
163     uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
164 
165     if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
166         trace_qemu_s390_airq_suppressed(type, isc);
167         return 0;
168     }
169 
170     fsc->inject_io(fs, 0, 0, 0, io_int_word);
171 
172     if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
173         flic->nimm |= AIS_MODE_MASK(isc);
174         trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
175                                       "NO-Interruptions Mode");
176     }
177 
178     return 0;
179 }
180 
181 static void qemu_s390_flic_notify(uint32_t type)
182 {
183     CPUState *cs;
184 
185     /*
186      * We have to make all CPUs see CPU_INTERRUPT_HARD, so they might
187      * consider it. We will kick all running CPUs and only relevant
188      * sleeping ones.
189      */
190     CPU_FOREACH(cs) {
191         S390CPU *cpu = S390_CPU(cs);
192 
193         cs->interrupt_request |= CPU_INTERRUPT_HARD;
194 
195         /* ignore CPUs that are not sleeping */
196         if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING &&
197             s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD) {
198             continue;
199         }
200 
201         /* we always kick running CPUs for now, this is tricky */
202         if (cs->halted) {
203             /* don't check for subclasses, CPUs double check when waking up */
204             if (type & FLIC_PENDING_SERVICE) {
205                 if (!(cpu->env.psw.mask & PSW_MASK_EXT)) {
206                     continue;
207                 }
208             } else if (type & FLIC_PENDING_IO) {
209                 if (!(cpu->env.psw.mask & PSW_MASK_IO)) {
210                     continue;
211                 }
212             } else if (type & FLIC_PENDING_MCHK_CR) {
213                 if (!(cpu->env.psw.mask & PSW_MASK_MCHECK)) {
214                     continue;
215                 }
216             }
217         }
218         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
219     }
220 }
221 
222 uint32_t qemu_s390_flic_dequeue_service(QEMUS390FLICState *flic)
223 {
224     uint32_t tmp;
225 
226     g_assert(bql_locked());
227     g_assert(flic->pending & FLIC_PENDING_SERVICE);
228     tmp = flic->service_param;
229     flic->service_param = 0;
230     flic->pending &= ~FLIC_PENDING_SERVICE;
231 
232     return tmp;
233 }
234 
235 /* caller has to free the returned object */
236 QEMUS390FlicIO *qemu_s390_flic_dequeue_io(QEMUS390FLICState *flic, uint64_t cr6)
237 {
238     QEMUS390FlicIO *io;
239     uint8_t isc;
240 
241     g_assert(bql_locked());
242     if (!(flic->pending & CR6_TO_PENDING_IO(cr6))) {
243         return NULL;
244     }
245 
246     for (isc = 0; isc < 8; isc++) {
247         if (QLIST_EMPTY(&flic->io[isc]) || !(cr6 & ISC_TO_ISC_BITS(isc))) {
248             continue;
249         }
250         io = QLIST_FIRST(&flic->io[isc]);
251         QLIST_REMOVE(io, next);
252 
253         /* update our indicator bit */
254         if (QLIST_EMPTY(&flic->io[isc])) {
255             flic->pending &= ~ISC_TO_PENDING_IO(isc);
256         }
257         return io;
258     }
259 
260     return NULL;
261 }
262 
263 void qemu_s390_flic_dequeue_crw_mchk(QEMUS390FLICState *flic)
264 {
265     g_assert(bql_locked());
266     g_assert(flic->pending & FLIC_PENDING_MCHK_CR);
267     flic->pending &= ~FLIC_PENDING_MCHK_CR;
268 }
269 
270 static void qemu_s390_inject_service(S390FLICState *fs, uint32_t parm)
271 {
272     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
273 
274     g_assert(bql_locked());
275     /* multiplexing is good enough for sclp - kvm does it internally as well */
276     flic->service_param |= parm;
277     flic->pending |= FLIC_PENDING_SERVICE;
278 
279     qemu_s390_flic_notify(FLIC_PENDING_SERVICE);
280 }
281 
282 static void qemu_s390_inject_io(S390FLICState *fs, uint16_t subchannel_id,
283                                 uint16_t subchannel_nr, uint32_t io_int_parm,
284                                 uint32_t io_int_word)
285 {
286     const uint8_t isc = IO_INT_WORD_ISC(io_int_word);
287     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
288     QEMUS390FlicIO *io;
289 
290     g_assert(bql_locked());
291     io = g_new0(QEMUS390FlicIO, 1);
292     io->id = subchannel_id;
293     io->nr = subchannel_nr;
294     io->parm = io_int_parm;
295     io->word = io_int_word;
296 
297     QLIST_INSERT_HEAD(&flic->io[isc], io, next);
298     flic->pending |= ISC_TO_PENDING_IO(isc);
299 
300     qemu_s390_flic_notify(ISC_TO_PENDING_IO(isc));
301 }
302 
303 static void qemu_s390_inject_crw_mchk(S390FLICState *fs)
304 {
305     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
306 
307     g_assert(bql_locked());
308     flic->pending |= FLIC_PENDING_MCHK_CR;
309 
310     qemu_s390_flic_notify(FLIC_PENDING_MCHK_CR);
311 }
312 
313 bool qemu_s390_flic_has_service(QEMUS390FLICState *flic)
314 {
315     /* called without lock via cc->has_work, will be validated under lock */
316     return !!(flic->pending & FLIC_PENDING_SERVICE);
317 }
318 
319 bool qemu_s390_flic_has_io(QEMUS390FLICState *flic, uint64_t cr6)
320 {
321     /* called without lock via cc->has_work, will be validated under lock */
322     return !!(flic->pending & CR6_TO_PENDING_IO(cr6));
323 }
324 
325 bool qemu_s390_flic_has_crw_mchk(QEMUS390FLICState *flic)
326 {
327     /* called without lock via cc->has_work, will be validated under lock */
328     return !!(flic->pending & FLIC_PENDING_MCHK_CR);
329 }
330 
331 bool qemu_s390_flic_has_any(QEMUS390FLICState *flic)
332 {
333     g_assert(bql_locked());
334     return !!flic->pending;
335 }
336 
337 static void qemu_s390_flic_reset(DeviceState *dev)
338 {
339     QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
340     QEMUS390FlicIO *cur, *next;
341     int isc;
342 
343     g_assert(bql_locked());
344     flic->simm = 0;
345     flic->nimm = 0;
346     flic->pending = 0;
347 
348     /* remove all pending io interrupts */
349     for (isc = 0; isc < 8; isc++) {
350         QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
351             QLIST_REMOVE(cur, next);
352             g_free(cur);
353         }
354     }
355 }
356 
357 bool ais_needed(void *opaque)
358 {
359     S390FLICState *s = opaque;
360 
361     return s->ais_supported;
362 }
363 
364 static const VMStateDescription qemu_s390_flic_vmstate = {
365     .name = "qemu-s390-flic",
366     .version_id = 1,
367     .minimum_version_id = 1,
368     .needed = ais_needed,
369     .fields = (const VMStateField[]) {
370         VMSTATE_UINT8(simm, QEMUS390FLICState),
371         VMSTATE_UINT8(nimm, QEMUS390FLICState),
372         VMSTATE_END_OF_LIST()
373     }
374 };
375 
376 static void qemu_s390_flic_instance_init(Object *obj)
377 {
378     QEMUS390FLICState *flic = QEMU_S390_FLIC(obj);
379     int isc;
380 
381     for (isc = 0; isc < 8; isc++) {
382         QLIST_INIT(&flic->io[isc]);
383     }
384 }
385 
386 static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
387 {
388     DeviceClass *dc = DEVICE_CLASS(oc);
389     S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
390 
391     dc->reset = qemu_s390_flic_reset;
392     dc->vmsd = &qemu_s390_flic_vmstate;
393     fsc->register_io_adapter = qemu_s390_register_io_adapter;
394     fsc->io_adapter_map = qemu_s390_io_adapter_map;
395     fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
396     fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
397     fsc->clear_io_irq = qemu_s390_clear_io_flic;
398     fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
399     fsc->inject_airq = qemu_s390_inject_airq;
400     fsc->inject_service = qemu_s390_inject_service;
401     fsc->inject_io = qemu_s390_inject_io;
402     fsc->inject_crw_mchk = qemu_s390_inject_crw_mchk;
403 }
404 
405 static Property s390_flic_common_properties[] = {
406     DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
407                        adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
408     DEFINE_PROP_BOOL("migration-enabled", S390FLICState,
409                      migration_enabled, true),
410     DEFINE_PROP_END_OF_LIST(),
411 };
412 
413 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
414 {
415     S390FLICState *fs = S390_FLIC_COMMON(dev);
416     uint32_t max_batch = fs->adapter_routes_max_batch;
417 
418     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
419         error_setg(errp, "flic property adapter_routes_max_batch too big"
420                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
421         return;
422     }
423 
424     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
425 }
426 
427 static void s390_flic_class_init(ObjectClass *oc, void *data)
428 {
429     DeviceClass *dc = DEVICE_CLASS(oc);
430 
431     device_class_set_props(dc, s390_flic_common_properties);
432     dc->realize = s390_flic_common_realize;
433 }
434 
435 static const TypeInfo qemu_s390_flic_info = {
436     .name          = TYPE_QEMU_S390_FLIC,
437     .parent        = TYPE_S390_FLIC_COMMON,
438     .instance_size = sizeof(QEMUS390FLICState),
439     .instance_init = qemu_s390_flic_instance_init,
440     .class_init    = qemu_s390_flic_class_init,
441 };
442 
443 
444 static const TypeInfo s390_flic_common_info = {
445     .name          = TYPE_S390_FLIC_COMMON,
446     .parent        = TYPE_SYS_BUS_DEVICE,
447     .instance_size = sizeof(S390FLICState),
448     .class_init    = s390_flic_class_init,
449     .class_size    = sizeof(S390FLICStateClass),
450 };
451 
452 static void qemu_s390_flic_register_types(void)
453 {
454     type_register_static(&s390_flic_common_info);
455     type_register_static(&qemu_s390_flic_info);
456 }
457 
458 type_init(qemu_s390_flic_register_types)
459 
460 static bool adapter_info_so_needed(void *opaque)
461 {
462     S390FLICState *fs = S390_FLIC_COMMON(opaque);
463 
464     return fs->migration_enabled;
465 }
466 
467 const VMStateDescription vmstate_adapter_info_so = {
468     .name = "s390_adapter_info/summary_offset",
469     .version_id = 1,
470     .minimum_version_id = 1,
471     .needed = adapter_info_so_needed,
472     .fields = (const VMStateField[]) {
473         VMSTATE_UINT32(summary_offset, AdapterInfo),
474         VMSTATE_END_OF_LIST()
475     }
476 };
477 
478 const VMStateDescription vmstate_adapter_info = {
479     .name = "s390_adapter_info",
480     .version_id = 1,
481     .minimum_version_id = 1,
482     .fields = (const VMStateField[]) {
483         VMSTATE_UINT64(ind_offset, AdapterInfo),
484         /*
485          * We do not have to migrate neither the id nor the addresses.
486          * The id is set by css_register_io_adapter and the addresses
487          * are set based on the IndAddr objects after those get mapped.
488          */
489         VMSTATE_END_OF_LIST()
490     },
491     .subsections = (const VMStateDescription * const []) {
492         &vmstate_adapter_info_so,
493         NULL
494     }
495 };
496 
497 const VMStateDescription vmstate_adapter_routes = {
498 
499     .name = "s390_adapter_routes",
500     .version_id = 1,
501     .minimum_version_id = 1,
502     .fields = (const VMStateField[]) {
503         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
504                        AdapterInfo),
505         VMSTATE_END_OF_LIST()
506     }
507 };
508