xref: /openbmc/qemu/hw/intc/s390_flic.c (revision f7160f32) 
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 "cpu.h"
24 #include "qapi/error.h"
25 #include "hw/s390x/s390-virtio-ccw.h"
26 
27 S390FLICStateClass *s390_get_flic_class(S390FLICState *fs)
28 {
29     static S390FLICStateClass *class;
30 
31     if (!class) {
32         /* we only have one flic device, so this is fine to cache */
33         class = S390_FLIC_COMMON_GET_CLASS(fs);
34     }
35     return class;
36 }
37 
38 QEMUS390FLICState *s390_get_qemu_flic(S390FLICState *fs)
39 {
40     static QEMUS390FLICState *flic;
41 
42     if (!flic) {
43         /* we only have one flic device, so this is fine to cache */
44         flic = QEMU_S390_FLIC(fs);
45     }
46     return flic;
47 }
48 
49 S390FLICState *s390_get_flic(void)
50 {
51     static S390FLICState *fs;
52 
53     if (!fs) {
54         fs = S390_FLIC_COMMON(object_resolve_path_type("",
55                                                        TYPE_S390_FLIC_COMMON,
56                                                        NULL));
57     }
58     return fs;
59 }
60 
61 void s390_flic_init(void)
62 {
63     DeviceState *dev;
64 
65     if (kvm_enabled()) {
66         dev = qdev_new(TYPE_KVM_S390_FLIC);
67         object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
68                                   OBJECT(dev));
69     } else {
70         dev = qdev_new(TYPE_QEMU_S390_FLIC);
71         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
72                                   OBJECT(dev));
73     }
74     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
75 }
76 
77 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
78                                          uint8_t isc, bool swap,
79                                          bool is_maskable, uint8_t flags)
80 {
81     /* nothing to do */
82     return 0;
83 }
84 
85 static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
86                                     uint64_t map_addr, bool do_map)
87 {
88     /* nothing to do */
89     return 0;
90 }
91 
92 static int qemu_s390_add_adapter_routes(S390FLICState *fs,
93                                         AdapterRoutes *routes)
94 {
95     return -ENOSYS;
96 }
97 
98 static void qemu_s390_release_adapter_routes(S390FLICState *fs,
99                                              AdapterRoutes *routes)
100 {
101 }
102 
103 static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
104                            uint16_t subchannel_nr)
105 {
106     QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
107     QEMUS390FlicIO *cur, *next;
108     uint8_t isc;
109 
110     g_assert(qemu_mutex_iothread_locked());
111     if (!(flic->pending & FLIC_PENDING_IO)) {
112         return 0;
113     }
114 
115     /* check all iscs */
116     for (isc = 0; isc < 8; isc++) {
117         if (QLIST_EMPTY(&flic->io[isc])) {
118             continue;
119         }
120 
121         /* search and delete any matching one */
122         QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
123             if (cur->id == subchannel_id && cur->nr == subchannel_nr) {
124                 QLIST_REMOVE(cur, next);
125                 g_free(cur);
126             }
127         }
128 
129         /* update our indicator bit */
130         if (QLIST_EMPTY(&flic->io[isc])) {
131             flic->pending &= ~ISC_TO_PENDING_IO(isc);
132         }
133     }
134     return 0;
135 }
136 
137 static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
138                                      uint16_t mode)
139 {
140     QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
141 
142     switch (mode) {
143     case SIC_IRQ_MODE_ALL:
144         flic->simm &= ~AIS_MODE_MASK(isc);
145         flic->nimm &= ~AIS_MODE_MASK(isc);
146         break;
147     case SIC_IRQ_MODE_SINGLE:
148         flic->simm |= AIS_MODE_MASK(isc);
149         flic->nimm &= ~AIS_MODE_MASK(isc);
150         break;
151     default:
152         return -EINVAL;
153     }
154 
155     return 0;
156 }
157 
158 static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
159                                  uint8_t isc, uint8_t flags)
160 {
161     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
162     S390FLICStateClass *fsc = s390_get_flic_class(fs);
163     bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
164     uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
165 
166     if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
167         trace_qemu_s390_airq_suppressed(type, isc);
168         return 0;
169     }
170 
171     fsc->inject_io(fs, 0, 0, 0, io_int_word);
172 
173     if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
174         flic->nimm |= AIS_MODE_MASK(isc);
175         trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
176                                       "NO-Interruptions Mode");
177     }
178 
179     return 0;
180 }
181 
182 static void qemu_s390_flic_notify(uint32_t type)
183 {
184     CPUState *cs;
185 
186     /*
187      * We have to make all CPUs see CPU_INTERRUPT_HARD, so they might
188      * consider it. We will kick all running CPUs and only relevant
189      * sleeping ones.
190      */
191     CPU_FOREACH(cs) {
192         S390CPU *cpu = S390_CPU(cs);
193 
194         cs->interrupt_request |= CPU_INTERRUPT_HARD;
195 
196         /* ignore CPUs that are not sleeping */
197         if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING &&
198             s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD) {
199             continue;
200         }
201 
202         /* we always kick running CPUs for now, this is tricky */
203         if (cs->halted) {
204             /* don't check for subclasses, CPUs double check when waking up */
205             if (type & FLIC_PENDING_SERVICE) {
206                 if (!(cpu->env.psw.mask & PSW_MASK_EXT)) {
207                     continue;
208                 }
209             } else if (type & FLIC_PENDING_IO) {
210                 if (!(cpu->env.psw.mask & PSW_MASK_IO)) {
211                     continue;
212                 }
213             } else if (type & FLIC_PENDING_MCHK_CR) {
214                 if (!(cpu->env.psw.mask & PSW_MASK_MCHECK)) {
215                     continue;
216                 }
217             }
218         }
219         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
220     }
221 }
222 
223 uint32_t qemu_s390_flic_dequeue_service(QEMUS390FLICState *flic)
224 {
225     uint32_t tmp;
226 
227     g_assert(qemu_mutex_iothread_locked());
228     g_assert(flic->pending & FLIC_PENDING_SERVICE);
229     tmp = flic->service_param;
230     flic->service_param = 0;
231     flic->pending &= ~FLIC_PENDING_SERVICE;
232 
233     return tmp;
234 }
235 
236 /* caller has to free the returned object */
237 QEMUS390FlicIO *qemu_s390_flic_dequeue_io(QEMUS390FLICState *flic, uint64_t cr6)
238 {
239     QEMUS390FlicIO *io;
240     uint8_t isc;
241 
242     g_assert(qemu_mutex_iothread_locked());
243     if (!(flic->pending & CR6_TO_PENDING_IO(cr6))) {
244         return NULL;
245     }
246 
247     for (isc = 0; isc < 8; isc++) {
248         if (QLIST_EMPTY(&flic->io[isc]) || !(cr6 & ISC_TO_ISC_BITS(isc))) {
249             continue;
250         }
251         io = QLIST_FIRST(&flic->io[isc]);
252         QLIST_REMOVE(io, next);
253 
254         /* update our indicator bit */
255         if (QLIST_EMPTY(&flic->io[isc])) {
256             flic->pending &= ~ISC_TO_PENDING_IO(isc);
257         }
258         return io;
259     }
260 
261     return NULL;
262 }
263 
264 void qemu_s390_flic_dequeue_crw_mchk(QEMUS390FLICState *flic)
265 {
266     g_assert(qemu_mutex_iothread_locked());
267     g_assert(flic->pending & FLIC_PENDING_MCHK_CR);
268     flic->pending &= ~FLIC_PENDING_MCHK_CR;
269 }
270 
271 static void qemu_s390_inject_service(S390FLICState *fs, uint32_t parm)
272 {
273     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
274 
275     g_assert(qemu_mutex_iothread_locked());
276     /* multiplexing is good enough for sclp - kvm does it internally as well */
277     flic->service_param |= parm;
278     flic->pending |= FLIC_PENDING_SERVICE;
279 
280     qemu_s390_flic_notify(FLIC_PENDING_SERVICE);
281 }
282 
283 static void qemu_s390_inject_io(S390FLICState *fs, uint16_t subchannel_id,
284                                 uint16_t subchannel_nr, uint32_t io_int_parm,
285                                 uint32_t io_int_word)
286 {
287     const uint8_t isc = IO_INT_WORD_ISC(io_int_word);
288     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
289     QEMUS390FlicIO *io;
290 
291     g_assert(qemu_mutex_iothread_locked());
292     io = g_new0(QEMUS390FlicIO, 1);
293     io->id = subchannel_id;
294     io->nr = subchannel_nr;
295     io->parm = io_int_parm;
296     io->word = io_int_word;
297 
298     QLIST_INSERT_HEAD(&flic->io[isc], io, next);
299     flic->pending |= ISC_TO_PENDING_IO(isc);
300 
301     qemu_s390_flic_notify(ISC_TO_PENDING_IO(isc));
302 }
303 
304 static void qemu_s390_inject_crw_mchk(S390FLICState *fs)
305 {
306     QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
307 
308     g_assert(qemu_mutex_iothread_locked());
309     flic->pending |= FLIC_PENDING_MCHK_CR;
310 
311     qemu_s390_flic_notify(FLIC_PENDING_MCHK_CR);
312 }
313 
314 bool qemu_s390_flic_has_service(QEMUS390FLICState *flic)
315 {
316     /* called without lock via cc->has_work, will be validated under lock */
317     return !!(flic->pending & FLIC_PENDING_SERVICE);
318 }
319 
320 bool qemu_s390_flic_has_io(QEMUS390FLICState *flic, uint64_t cr6)
321 {
322     /* called without lock via cc->has_work, will be validated under lock */
323     return !!(flic->pending & CR6_TO_PENDING_IO(cr6));
324 }
325 
326 bool qemu_s390_flic_has_crw_mchk(QEMUS390FLICState *flic)
327 {
328     /* called without lock via cc->has_work, will be validated under lock */
329     return !!(flic->pending & FLIC_PENDING_MCHK_CR);
330 }
331 
332 bool qemu_s390_flic_has_any(QEMUS390FLICState *flic)
333 {
334     g_assert(qemu_mutex_iothread_locked());
335     return !!flic->pending;
336 }
337 
338 static void qemu_s390_flic_reset(DeviceState *dev)
339 {
340     QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
341     QEMUS390FlicIO *cur, *next;
342     int isc;
343 
344     g_assert(qemu_mutex_iothread_locked());
345     flic->simm = 0;
346     flic->nimm = 0;
347     flic->pending = 0;
348 
349     /* remove all pending io interrupts */
350     for (isc = 0; isc < 8; isc++) {
351         QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
352             QLIST_REMOVE(cur, next);
353             g_free(cur);
354         }
355     }
356 }
357 
358 bool ais_needed(void *opaque)
359 {
360     S390FLICState *s = opaque;
361 
362     return s->ais_supported;
363 }
364 
365 static const VMStateDescription qemu_s390_flic_vmstate = {
366     .name = "qemu-s390-flic",
367     .version_id = 1,
368     .minimum_version_id = 1,
369     .needed = ais_needed,
370     .fields = (VMStateField[]) {
371         VMSTATE_UINT8(simm, QEMUS390FLICState),
372         VMSTATE_UINT8(nimm, QEMUS390FLICState),
373         VMSTATE_END_OF_LIST()
374     }
375 };
376 
377 static void qemu_s390_flic_instance_init(Object *obj)
378 {
379     QEMUS390FLICState *flic = QEMU_S390_FLIC(obj);
380     int isc;
381 
382     for (isc = 0; isc < 8; isc++) {
383         QLIST_INIT(&flic->io[isc]);
384     }
385 }
386 
387 static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
388 {
389     DeviceClass *dc = DEVICE_CLASS(oc);
390     S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
391 
392     dc->reset = qemu_s390_flic_reset;
393     dc->vmsd = &qemu_s390_flic_vmstate;
394     fsc->register_io_adapter = qemu_s390_register_io_adapter;
395     fsc->io_adapter_map = qemu_s390_io_adapter_map;
396     fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
397     fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
398     fsc->clear_io_irq = qemu_s390_clear_io_flic;
399     fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
400     fsc->inject_airq = qemu_s390_inject_airq;
401     fsc->inject_service = qemu_s390_inject_service;
402     fsc->inject_io = qemu_s390_inject_io;
403     fsc->inject_crw_mchk = qemu_s390_inject_crw_mchk;
404 }
405 
406 static Property s390_flic_common_properties[] = {
407     DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
408                        adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
409     DEFINE_PROP_END_OF_LIST(),
410 };
411 
412 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
413 {
414     S390FLICState *fs = S390_FLIC_COMMON(dev);
415     uint32_t max_batch = fs->adapter_routes_max_batch;
416 
417     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
418         error_setg(errp, "flic property adapter_routes_max_batch too big"
419                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
420         return;
421     }
422 
423     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
424 }
425 
426 static void s390_flic_class_init(ObjectClass *oc, void *data)
427 {
428     DeviceClass *dc = DEVICE_CLASS(oc);
429 
430     device_class_set_props(dc, s390_flic_common_properties);
431     dc->realize = s390_flic_common_realize;
432 }
433 
434 static const TypeInfo qemu_s390_flic_info = {
435     .name          = TYPE_QEMU_S390_FLIC,
436     .parent        = TYPE_S390_FLIC_COMMON,
437     .instance_size = sizeof(QEMUS390FLICState),
438     .instance_init = qemu_s390_flic_instance_init,
439     .class_init    = qemu_s390_flic_class_init,
440 };
441 
442 
443 static const TypeInfo s390_flic_common_info = {
444     .name          = TYPE_S390_FLIC_COMMON,
445     .parent        = TYPE_SYS_BUS_DEVICE,
446     .instance_size = sizeof(S390FLICState),
447     .class_init    = s390_flic_class_init,
448     .class_size    = sizeof(S390FLICStateClass),
449 };
450 
451 static void qemu_s390_flic_register_types(void)
452 {
453     type_register_static(&s390_flic_common_info);
454     type_register_static(&qemu_s390_flic_info);
455 }
456 
457 type_init(qemu_s390_flic_register_types)
458 
459 static bool adapter_info_so_needed(void *opaque)
460 {
461     return css_migration_enabled();
462 }
463 
464 const VMStateDescription vmstate_adapter_info_so = {
465     .name = "s390_adapter_info/summary_offset",
466     .version_id = 1,
467     .minimum_version_id = 1,
468     .needed = adapter_info_so_needed,
469     .fields = (VMStateField[]) {
470         VMSTATE_UINT32(summary_offset, AdapterInfo),
471         VMSTATE_END_OF_LIST()
472     }
473 };
474 
475 const VMStateDescription vmstate_adapter_info = {
476     .name = "s390_adapter_info",
477     .version_id = 1,
478     .minimum_version_id = 1,
479     .fields = (VMStateField[]) {
480         VMSTATE_UINT64(ind_offset, AdapterInfo),
481         /*
482          * We do not have to migrate neither the id nor the addresses.
483          * The id is set by css_register_io_adapter and the addresses
484          * are set based on the IndAddr objects after those get mapped.
485          */
486         VMSTATE_END_OF_LIST()
487     },
488     .subsections = (const VMStateDescription * []) {
489         &vmstate_adapter_info_so,
490         NULL
491     }
492 };
493 
494 const VMStateDescription vmstate_adapter_routes = {
495 
496     .name = "s390_adapter_routes",
497     .version_id = 1,
498     .minimum_version_id = 1,
499     .fields = (VMStateField[]) {
500         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
501                        AdapterInfo),
502         VMSTATE_END_OF_LIST()
503     }
504 };
505