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 "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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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(qemu_mutex_iothread_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 = (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_END_OF_LIST(),
 409 };
 410
 411 static void s390_flic_common_realize(DeviceState *dev, Error **errp)
 412 {
 413     S390FLICState *fs = S390_FLIC_COMMON(dev);
 414     uint32_t max_batch = fs->adapter_routes_max_batch;
 415
 416     if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
 417         error_setg(errp, "flic property adapter_routes_max_batch too big"
 418                    " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
 419         return;
 420     }
 421
 422     fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
 423 }
 424
 425 static void s390_flic_class_init(ObjectClass *oc, void *data)
 426 {
 427     DeviceClass *dc = DEVICE_CLASS(oc);
 428
 429     device_class_set_props(dc, s390_flic_common_properties);
 430     dc->realize = s390_flic_common_realize;
 431 }
 432
 433 static const TypeInfo qemu_s390_flic_info = {
 434     .name          = TYPE_QEMU_S390_FLIC,
 435     .parent        = TYPE_S390_FLIC_COMMON,
 436     .instance_size = sizeof(QEMUS390FLICState),
 437     .instance_init = qemu_s390_flic_instance_init,
 438     .class_init    = qemu_s390_flic_class_init,
 439 };
 440
 441
 442 static const TypeInfo s390_flic_common_info = {
 443     .name          = TYPE_S390_FLIC_COMMON,
 444     .parent        = TYPE_SYS_BUS_DEVICE,
 445     .instance_size = sizeof(S390FLICState),
 446     .class_init    = s390_flic_class_init,
 447     .class_size    = sizeof(S390FLICStateClass),
 448 };
 449
 450 static void qemu_s390_flic_register_types(void)
 451 {
 452     type_register_static(&s390_flic_common_info);
 453     type_register_static(&qemu_s390_flic_info);
 454 }
 455
 456 type_init(qemu_s390_flic_register_types)
 457
 458 static bool adapter_info_so_needed(void *opaque)
 459 {
 460     return css_migration_enabled();
 461 }
 462
 463 const VMStateDescription vmstate_adapter_info_so = {
 464     .name = "s390_adapter_info/summary_offset",
 465     .version_id = 1,
 466     .minimum_version_id = 1,
 467     .needed = adapter_info_so_needed,
 468     .fields = (VMStateField[]) {
 469         VMSTATE_UINT32(summary_offset, AdapterInfo),
 470         VMSTATE_END_OF_LIST()
 471     }
 472 };
 473
 474 const VMStateDescription vmstate_adapter_info = {
 475     .name = "s390_adapter_info",
 476     .version_id = 1,
 477     .minimum_version_id = 1,
 478     .fields = (VMStateField[]) {
 479         VMSTATE_UINT64(ind_offset, AdapterInfo),
 480         /*
 481          * We do not have to migrate neither the id nor the addresses.
 482          * The id is set by css_register_io_adapter and the addresses
 483          * are set based on the IndAddr objects after those get mapped.
 484          */
 485         VMSTATE_END_OF_LIST()
 486     },
 487     .subsections = (const VMStateDescription * []) {
 488         &vmstate_adapter_info_so,
 489         NULL
 490     }
 491 };
 492
 493 const VMStateDescription vmstate_adapter_routes = {
 494
 495     .name = "s390_adapter_routes",
 496     .version_id = 1,
 497     .minimum_version_id = 1,
 498     .fields = (VMStateField[]) {
 499         VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
 500                        AdapterInfo),
 501         VMSTATE_END_OF_LIST()
 502     }
 503 };