xref: /openbmc/qemu/hw/intc/s390_flic.c (revision 750541c4) 
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 S390FLICStateClass *s390_get_flic_class(S390FLICState *fs)
26 {
27     static S390FLICStateClass *class;
28 
29     if (!class) {
30         /* we only have one flic device, so this is fine to cache */
31         class = S390_FLIC_COMMON_GET_CLASS(fs);
32     }
33     return class;
34 }
35 
36 QEMUS390FLICState *s390_get_qemu_flic(S390FLICState *fs)
37 {
38     static QEMUS390FLICState *flic;
39 
40     if (!flic) {
41         /* we only have one flic device, so this is fine to cache */
42         flic = QEMU_S390_FLIC(fs);
43     }
44     return flic;
45 }
46 
47 S390FLICState *s390_get_flic(void)
48 {
49     static S390FLICState *fs;
50 
51     if (!fs) {
52         fs = S390_FLIC_COMMON(object_resolve_path_type("",
53                                                        TYPE_S390_FLIC_COMMON,
54                                                        NULL));
55     }
56     return fs;
57 }
58 
59 void s390_flic_init(void)
60 {
61     DeviceState *dev;
62 
63     if (kvm_enabled()) {
64         dev = qdev_create(NULL, TYPE_KVM_S390_FLIC);
65         object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
66                                   OBJECT(dev), NULL);
67     } else {
68         dev = qdev_create(NULL, TYPE_QEMU_S390_FLIC);
69         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
70                                   OBJECT(dev), NULL);
71     }
72     qdev_init_nofail(dev);
73 }
74 
75 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
76                                          uint8_t isc, bool swap,
77                                          bool is_maskable, uint8_t flags)
78 {
79     /* nothing to do */
80     return 0;
81 }
82 
83 static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
84                                     uint64_t map_addr, bool do_map)
85 {
86     /* nothing to do */
87     return 0;
88 }
89 
90 static int qemu_s390_add_adapter_routes(S390FLICState *fs,
91                                         AdapterRoutes *routes)
92 {
93     return -ENOSYS;
94 }
95 
96 static void qemu_s390_release_adapter_routes(S390FLICState *fs,
97                                              AdapterRoutes *routes)
98 {
99 }
100 
101 static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
102                            uint16_t subchannel_nr)
103 {
104     QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
105     QEMUS390FlicIO *cur, *next;
106     uint8_t isc;
107 
108     g_assert(qemu_mutex_iothread_locked());
109     if (!(flic->pending & FLIC_PENDING_IO)) {
110         return 0;
111     }
112 
113     /* check all iscs */
114     for (isc = 0; isc < 8; isc++) {
115         if (QLIST_EMPTY(&flic->io[isc])) {
116             continue;
117         }
118 
119         /* search and delete any matching one */
120         QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
121             if (cur->id == subchannel_id && cur->nr == subchannel_nr) {
122                 QLIST_REMOVE(cur, next);
123                 g_free(cur);
124             }
125         }
126 
127         /* update our indicator bit */
128         if (QLIST_EMPTY(&flic->io[isc])) {
129             flic->pending &= ~ISC_TO_PENDING_IO(isc);
130         }
131     }
132     return 0;
133 }
134 
135 static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
136                                      uint16_t mode)
137 {
138     QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
139 
140     switch (mode) {
141     case SIC_IRQ_MODE_ALL:
142         flic->simm &= ~AIS_MODE_MASK(isc);
143         flic->nimm &= ~AIS_MODE_MASK(isc);
144         break;
145     case SIC_IRQ_MODE_SINGLE:
146         flic->simm |= AIS_MODE_MASK(isc);
147         flic->nimm &= ~AIS_MODE_MASK(isc);
148         break;
149     default:
150         return -EINVAL;
151     }
152 
153     return 0;
154 }
155 
156 static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
157                                  uint8_t isc, uint8_t flags)
158 {
159     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
160     S390FLICStateClass *fsc = s390_get_flic_class(fs);
161     bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
162     uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
163 
164     if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
165         trace_qemu_s390_airq_suppressed(type, isc);
166         return 0;
167     }
168 
169     fsc->inject_io(fs, 0, 0, 0, io_int_word);
170 
171     if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
172         flic->nimm |= AIS_MODE_MASK(isc);
173         trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
174                                       "NO-Interruptions Mode");
175     }
176 
177     return 0;
178 }
179 
180 static void qemu_s390_flic_notify(uint32_t type)
181 {
182     CPUState *cs;
183 
184     /*
185      * We have to make all CPUs see CPU_INTERRUPT_HARD, so they might
186      * consider it. We will kick all running CPUs and only relevant
187      * sleeping ones.
188      */
189     CPU_FOREACH(cs) {
190         S390CPU *cpu = S390_CPU(cs);
191 
192         cs->interrupt_request |= CPU_INTERRUPT_HARD;
193 
194         /* ignore CPUs that are not sleeping */
195         if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING &&
196             s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD) {
197             continue;
198         }
199 
200         /* we always kick running CPUs for now, this is tricky */
201         if (cs->halted) {
202             /* don't check for subclasses, CPUs double check when waking up */
203             if (type & FLIC_PENDING_SERVICE) {
204                 if (!(cpu->env.psw.mask & PSW_MASK_EXT)) {
205                     continue;
206                 }
207             } else if (type & FLIC_PENDING_IO) {
208                 if (!(cpu->env.psw.mask & PSW_MASK_IO)) {
209                     continue;
210                 }
211             } else if (type & FLIC_PENDING_MCHK_CR) {
212                 if (!(cpu->env.psw.mask & PSW_MASK_MCHECK)) {
213                     continue;
214                 }
215             }
216         }
217         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
218     }
219 }
220 
221 uint32_t qemu_s390_flic_dequeue_service(QEMUS390FLICState *flic)
222 {
223     uint32_t tmp;
224 
225     g_assert(qemu_mutex_iothread_locked());
226     g_assert(flic->pending & FLIC_PENDING_SERVICE);
227     tmp = flic->service_param;
228     flic->service_param = 0;
229     flic->pending &= ~FLIC_PENDING_SERVICE;
230 
231     return tmp;
232 }
233 
234 /* caller has to free the returned object */
235 QEMUS390FlicIO *qemu_s390_flic_dequeue_io(QEMUS390FLICState *flic, uint64_t cr6)
236 {
237     QEMUS390FlicIO *io;
238     uint8_t isc;
239 
240     g_assert(qemu_mutex_iothread_locked());
241     if (!(flic->pending & CR6_TO_PENDING_IO(cr6))) {
242         return NULL;
243     }
244 
245     for (isc = 0; isc < 8; isc++) {
246         if (QLIST_EMPTY(&flic->io[isc]) || !(cr6 & ISC_TO_ISC_BITS(isc))) {
247             continue;
248         }
249         io = QLIST_FIRST(&flic->io[isc]);
250         QLIST_REMOVE(io, next);
251 
252         /* update our indicator bit */
253         if (QLIST_EMPTY(&flic->io[isc])) {
254             flic->pending &= ~ISC_TO_PENDING_IO(isc);
255         }
256         return io;
257     }
258 
259     return NULL;
260 }
261 
262 void qemu_s390_flic_dequeue_crw_mchk(QEMUS390FLICState *flic)
263 {
264     g_assert(qemu_mutex_iothread_locked());
265     g_assert(flic->pending & FLIC_PENDING_MCHK_CR);
266     flic->pending &= ~FLIC_PENDING_MCHK_CR;
267 }
268 
269 static void qemu_s390_inject_service(S390FLICState *fs, uint32_t parm)
270 {
271     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
272 
273     g_assert(qemu_mutex_iothread_locked());
274     /* multiplexing is good enough for sclp - kvm does it internally as well */
275     flic->service_param |= parm;
276     flic->pending |= FLIC_PENDING_SERVICE;
277 
278     qemu_s390_flic_notify(FLIC_PENDING_SERVICE);
279 }
280 
281 static void qemu_s390_inject_io(S390FLICState *fs, uint16_t subchannel_id,
282                                 uint16_t subchannel_nr, uint32_t io_int_parm,
283                                 uint32_t io_int_word)
284 {
285     const uint8_t isc = IO_INT_WORD_ISC(io_int_word);
286     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
287     QEMUS390FlicIO *io;
288 
289     g_assert(qemu_mutex_iothread_locked());
290     io = g_new0(QEMUS390FlicIO, 1);
291     io->id = subchannel_id;
292     io->nr = subchannel_nr;
293     io->parm = io_int_parm;
294     io->word = io_int_word;
295 
296     QLIST_INSERT_HEAD(&flic->io[isc], io, next);
297     flic->pending |= ISC_TO_PENDING_IO(isc);
298 
299     qemu_s390_flic_notify(ISC_TO_PENDING_IO(isc));
300 }
301 
302 static void qemu_s390_inject_crw_mchk(S390FLICState *fs)
303 {
304     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
305 
306     g_assert(qemu_mutex_iothread_locked());
307     flic->pending |= FLIC_PENDING_MCHK_CR;
308 
309     qemu_s390_flic_notify(FLIC_PENDING_MCHK_CR);
310 }
311 
312 bool qemu_s390_flic_has_service(QEMUS390FLICState *flic)
313 {
314     /* called without lock via cc->has_work, will be validated under lock */
315     return !!(flic->pending & FLIC_PENDING_SERVICE);
316 }
317 
318 bool qemu_s390_flic_has_io(QEMUS390FLICState *flic, uint64_t cr6)
319 {
320     /* called without lock via cc->has_work, will be validated under lock */
321     return !!(flic->pending & CR6_TO_PENDING_IO(cr6));
322 }
323 
324 bool qemu_s390_flic_has_crw_mchk(QEMUS390FLICState *flic)
325 {
326     /* called without lock via cc->has_work, will be validated under lock */
327     return !!(flic->pending & FLIC_PENDING_MCHK_CR);
328 }
329 
330 bool qemu_s390_flic_has_any(QEMUS390FLICState *flic)
331 {
332     g_assert(qemu_mutex_iothread_locked());
333     return !!flic->pending;
334 }
335 
336 static void qemu_s390_flic_reset(DeviceState *dev)
337 {
338     QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
339     QEMUS390FlicIO *cur, *next;
340     int isc;
341 
342     g_assert(qemu_mutex_iothread_locked());
343     flic->simm = 0;
344     flic->nimm = 0;
345     flic->pending = 0;
346 
347     /* remove all pending io interrupts */
348     for (isc = 0; isc < 8; isc++) {
349         QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
350             QLIST_REMOVE(cur, next);
351             g_free(cur);
352         }
353     }
354 }
355 
356 bool ais_needed(void *opaque)
357 {
358     S390FLICState *s = opaque;
359 
360     return s->ais_supported;
361 }
362 
363 static const VMStateDescription qemu_s390_flic_vmstate = {
364     .name = "qemu-s390-flic",
365     .version_id = 1,
366     .minimum_version_id = 1,
367     .needed = ais_needed,
368     .fields = (VMStateField[]) {
369         VMSTATE_UINT8(simm, QEMUS390FLICState),
370         VMSTATE_UINT8(nimm, QEMUS390FLICState),
371         VMSTATE_END_OF_LIST()
372     }
373 };
374 
375 static void qemu_s390_flic_instance_init(Object *obj)
376 {
377     QEMUS390FLICState *flic = QEMU_S390_FLIC(obj);
378     int isc;
379 
380     for (isc = 0; isc < 8; isc++) {
381         QLIST_INIT(&flic->io[isc]);
382     }
383 }
384 
385 static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
386 {
387     DeviceClass *dc = DEVICE_CLASS(oc);
388     S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
389 
390     dc->reset = qemu_s390_flic_reset;
391     dc->vmsd = &qemu_s390_flic_vmstate;
392     fsc->register_io_adapter = qemu_s390_register_io_adapter;
393     fsc->io_adapter_map = qemu_s390_io_adapter_map;
394     fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
395     fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
396     fsc->clear_io_irq = qemu_s390_clear_io_flic;
397     fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
398     fsc->inject_airq = qemu_s390_inject_airq;
399     fsc->inject_service = qemu_s390_inject_service;
400     fsc->inject_io = qemu_s390_inject_io;
401     fsc->inject_crw_mchk = qemu_s390_inject_crw_mchk;
402 }
403 
404 static Property s390_flic_common_properties[] = {
405     DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
406                        adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
407     DEFINE_PROP_END_OF_LIST(),
408 };
409 
410 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
411 {
412     S390FLICState *fs = S390_FLIC_COMMON(dev);
413     uint32_t max_batch = fs->adapter_routes_max_batch;
414 
415     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
416         error_setg(errp, "flic property adapter_routes_max_batch too big"
417                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
418         return;
419     }
420 
421     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
422 }
423 
424 static void s390_flic_class_init(ObjectClass *oc, void *data)
425 {
426     DeviceClass *dc = DEVICE_CLASS(oc);
427 
428     dc->props = s390_flic_common_properties;
429     dc->realize = s390_flic_common_realize;
430 }
431 
432 static const TypeInfo qemu_s390_flic_info = {
433     .name          = TYPE_QEMU_S390_FLIC,
434     .parent        = TYPE_S390_FLIC_COMMON,
435     .instance_size = sizeof(QEMUS390FLICState),
436     .instance_init = qemu_s390_flic_instance_init,
437     .class_init    = qemu_s390_flic_class_init,
438 };
439 
440 
441 static const TypeInfo s390_flic_common_info = {
442     .name          = TYPE_S390_FLIC_COMMON,
443     .parent        = TYPE_SYS_BUS_DEVICE,
444     .instance_size = sizeof(S390FLICState),
445     .class_init    = s390_flic_class_init,
446     .class_size    = sizeof(S390FLICStateClass),
447 };
448 
449 static void qemu_s390_flic_register_types(void)
450 {
451     type_register_static(&s390_flic_common_info);
452     type_register_static(&qemu_s390_flic_info);
453 }
454 
455 type_init(qemu_s390_flic_register_types)
456 
457 static bool adapter_info_so_needed(void *opaque)
458 {
459     return css_migration_enabled();
460 }
461 
462 const VMStateDescription vmstate_adapter_info_so = {
463     .name = "s390_adapter_info/summary_offset",
464     .version_id = 1,
465     .minimum_version_id = 1,
466     .needed = adapter_info_so_needed,
467     .fields = (VMStateField[]) {
468         VMSTATE_UINT32(summary_offset, AdapterInfo),
469         VMSTATE_END_OF_LIST()
470     }
471 };
472 
473 const VMStateDescription vmstate_adapter_info = {
474     .name = "s390_adapter_info",
475     .version_id = 1,
476     .minimum_version_id = 1,
477     .fields = (VMStateField[]) {
478         VMSTATE_UINT64(ind_offset, AdapterInfo),
479         /*
480          * We do not have to migrate neither the id nor the addresses.
481          * The id is set by css_register_io_adapter and the addresses
482          * are set based on the IndAddr objects after those get mapped.
483          */
484         VMSTATE_END_OF_LIST()
485     },
486     .subsections = (const VMStateDescription * []) {
487         &vmstate_adapter_info_so,
488         NULL
489     }
490 };
491 
492 const VMStateDescription vmstate_adapter_routes = {
493 
494     .name = "s390_adapter_routes",
495     .version_id = 1,
496     .minimum_version_id = 1,
497     .fields = (VMStateField[]) {
498         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
499                        AdapterInfo),
500         VMSTATE_END_OF_LIST()
501     }
502 };
503