hw/intc/s390_flic.c

   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_create(NULL, TYPE_KVM_S390_FLIC);
  67         object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
  68                                   OBJECT(dev));
  69     } else {
  70         dev = qdev_create(NULL, TYPE_QEMU_S390_FLIC);
  71         object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
  72                                   OBJECT(dev));
  73     }
  74     qdev_init_nofail(dev);
  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 };