hw/s390x/virtio-ccw.c

   1 /*
   2  * virtio ccw target implementation
   3  *
   4  * Copyright 2012,2014 IBM Corp.
   5  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   8  * your option) any later version. See the COPYING file in the top-level
   9  * directory.
  10  */
  11
  12 #include "hw/hw.h"
  13 #include "sysemu/block-backend.h"
  14 #include "sysemu/blockdev.h"
  15 #include "sysemu/sysemu.h"
  16 #include "net/net.h"
  17 #include "monitor/monitor.h"
  18 #include "hw/virtio/virtio.h"
  19 #include "hw/virtio/virtio-serial.h"
  20 #include "hw/virtio/virtio-net.h"
  21 #include "hw/sysbus.h"
  22 #include "qemu/bitops.h"
  23 #include "hw/virtio/virtio-bus.h"
  24 #include "hw/s390x/adapter.h"
  25 #include "hw/s390x/s390_flic.h"
  26
  27 #include "ioinst.h"
  28 #include "css.h"
  29 #include "virtio-ccw.h"
  30 #include "trace.h"
  31
  32 static QTAILQ_HEAD(, IndAddr) indicator_addresses =
  33     QTAILQ_HEAD_INITIALIZER(indicator_addresses);
  34
  35 static IndAddr *get_indicator(hwaddr ind_addr, int len)
  36 {
  37     IndAddr *indicator;
  38
  39     QTAILQ_FOREACH(indicator, &indicator_addresses, sibling) {
  40         if (indicator->addr == ind_addr) {
  41             indicator->refcnt++;
  42             return indicator;
  43         }
  44     }
  45     indicator = g_new0(IndAddr, 1);
  46     indicator->addr = ind_addr;
  47     indicator->len = len;
  48     indicator->refcnt = 1;
  49     QTAILQ_INSERT_TAIL(&indicator_addresses, indicator, sibling);
  50     return indicator;
  51 }
  52
  53 static int s390_io_adapter_map(AdapterInfo *adapter, uint64_t map_addr,
  54                                bool do_map)
  55 {
  56     S390FLICState *fs = s390_get_flic();
  57     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
  58
  59     return fsc->io_adapter_map(fs, adapter->adapter_id, map_addr, do_map);
  60 }
  61
  62 static void release_indicator(AdapterInfo *adapter, IndAddr *indicator)
  63 {
  64     assert(indicator->refcnt > 0);
  65     indicator->refcnt--;
  66     if (indicator->refcnt > 0) {
  67         return;
  68     }
  69     QTAILQ_REMOVE(&indicator_addresses, indicator, sibling);
  70     if (indicator->map) {
  71         s390_io_adapter_map(adapter, indicator->map, false);
  72     }
  73     g_free(indicator);
  74 }
  75
  76 static int map_indicator(AdapterInfo *adapter, IndAddr *indicator)
  77 {
  78     int ret;
  79
  80     if (indicator->map) {
  81         return 0; /* already mapped is not an error */
  82     }
  83     indicator->map = indicator->addr;
  84     ret = s390_io_adapter_map(adapter, indicator->map, true);
  85     if ((ret != 0) && (ret != -ENOSYS)) {
  86         goto out_err;
  87     }
  88     return 0;
  89
  90 out_err:
  91     indicator->map = 0;
  92     return ret;
  93 }
  94
  95 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
  96                                VirtioCcwDevice *dev);
  97
  98 static void virtual_css_bus_reset(BusState *qbus)
  99 {
 100     /* This should actually be modelled via the generic css */
 101     css_reset();
 102 }
 103
 104
 105 static void virtual_css_bus_class_init(ObjectClass *klass, void *data)
 106 {
 107     BusClass *k = BUS_CLASS(klass);
 108
 109     k->reset = virtual_css_bus_reset;
 110 }
 111
 112 static const TypeInfo virtual_css_bus_info = {
 113     .name = TYPE_VIRTUAL_CSS_BUS,
 114     .parent = TYPE_BUS,
 115     .instance_size = sizeof(VirtualCssBus),
 116     .class_init = virtual_css_bus_class_init,
 117 };
 118
 119 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch)
 120 {
 121     VirtIODevice *vdev = NULL;
 122     VirtioCcwDevice *dev = sch->driver_data;
 123
 124     if (dev) {
 125         vdev = virtio_bus_get_device(&dev->bus);
 126     }
 127     return vdev;
 128 }
 129
 130 static int virtio_ccw_set_guest2host_notifier(VirtioCcwDevice *dev, int n,
 131                                               bool assign, bool set_handler)
 132 {
 133     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
 134     VirtQueue *vq = virtio_get_queue(vdev, n);
 135     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 136     int r = 0;
 137     SubchDev *sch = dev->sch;
 138     uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid;
 139
 140     if (assign) {
 141         r = event_notifier_init(notifier, 1);
 142         if (r < 0) {
 143             error_report("%s: unable to init event notifier: %d", __func__, r);
 144             return r;
 145         }
 146         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 147         r = s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
 148         if (r < 0) {
 149             error_report("%s: unable to assign ioeventfd: %d", __func__, r);
 150             virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 151             event_notifier_cleanup(notifier);
 152             return r;
 153         }
 154     } else {
 155         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 156         s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
 157         event_notifier_cleanup(notifier);
 158     }
 159     return r;
 160 }
 161
 162 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev)
 163 {
 164     VirtIODevice *vdev;
 165     int n, r;
 166
 167     if (!(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) ||
 168         dev->ioeventfd_disabled ||
 169         dev->ioeventfd_started) {
 170         return;
 171     }
 172     vdev = virtio_bus_get_device(&dev->bus);
 173     for (n = 0; n < VIRTIO_CCW_QUEUE_MAX; n++) {
 174         if (!virtio_queue_get_num(vdev, n)) {
 175             continue;
 176         }
 177         r = virtio_ccw_set_guest2host_notifier(dev, n, true, true);
 178         if (r < 0) {
 179             goto assign_error;
 180         }
 181     }
 182     dev->ioeventfd_started = true;
 183     return;
 184
 185   assign_error:
 186     while (--n >= 0) {
 187         if (!virtio_queue_get_num(vdev, n)) {
 188             continue;
 189         }
 190         r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
 191         assert(r >= 0);
 192     }
 193     dev->ioeventfd_started = false;
 194     /* Disable ioeventfd for this device. */
 195     dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD;
 196     error_report("%s: failed. Fallback to userspace (slower).", __func__);
 197 }
 198
 199 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
 200 {
 201     VirtIODevice *vdev;
 202     int n, r;
 203
 204     if (!dev->ioeventfd_started) {
 205         return;
 206     }
 207     vdev = virtio_bus_get_device(&dev->bus);
 208     for (n = 0; n < VIRTIO_CCW_QUEUE_MAX; n++) {
 209         if (!virtio_queue_get_num(vdev, n)) {
 210             continue;
 211         }
 212         r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
 213         assert(r >= 0);
 214     }
 215     dev->ioeventfd_started = false;
 216 }
 217
 218 VirtualCssBus *virtual_css_bus_init(void)
 219 {
 220     VirtualCssBus *cbus;
 221     BusState *bus;
 222     DeviceState *dev;
 223
 224     /* Create bridge device */
 225     dev = qdev_create(NULL, "virtual-css-bridge");
 226     qdev_init_nofail(dev);
 227
 228     /* Create bus on bridge device */
 229     bus = qbus_create(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css");
 230     cbus = VIRTUAL_CSS_BUS(bus);
 231
 232     /* Enable hotplugging */
 233     qbus_set_hotplug_handler(bus, dev, &error_abort);
 234
 235     return cbus;
 236 }
 237
 238 /* Communication blocks used by several channel commands. */
 239 typedef struct VqInfoBlock {
 240     uint64_t queue;
 241     uint32_t align;
 242     uint16_t index;
 243     uint16_t num;
 244 } QEMU_PACKED VqInfoBlock;
 245
 246 typedef struct VqConfigBlock {
 247     uint16_t index;
 248     uint16_t num_max;
 249 } QEMU_PACKED VqConfigBlock;
 250
 251 typedef struct VirtioFeatDesc {
 252     uint32_t features;
 253     uint8_t index;
 254 } QEMU_PACKED VirtioFeatDesc;
 255
 256 typedef struct VirtioThinintInfo {
 257     hwaddr summary_indicator;
 258     hwaddr device_indicator;
 259     uint64_t ind_bit;
 260     uint8_t isc;
 261 } QEMU_PACKED VirtioThinintInfo;
 262
 263 /* Specify where the virtqueues for the subchannel are in guest memory. */
 264 static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,
 265                               uint16_t index, uint16_t num)
 266 {
 267     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
 268
 269     if (index >= VIRTIO_CCW_QUEUE_MAX) {
 270         return -EINVAL;
 271     }
 272
 273     /* Current code in virtio.c relies on 4K alignment. */
 274     if (addr && (align != 4096)) {
 275         return -EINVAL;
 276     }
 277
 278     if (!vdev) {
 279         return -EINVAL;
 280     }
 281
 282     virtio_queue_set_addr(vdev, index, addr);
 283     if (!addr) {
 284         virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR);
 285     } else {
 286         /* Fail if we don't have a big enough queue. */
 287         /* TODO: Add interface to handle vring.num changing */
 288         if (virtio_queue_get_num(vdev, index) > num) {
 289             return -EINVAL;
 290         }
 291         virtio_queue_set_vector(vdev, index, index);
 292     }
 293     /* tell notify handler in case of config change */
 294     vdev->config_vector = VIRTIO_CCW_QUEUE_MAX;
 295     return 0;
 296 }
 297
 298 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
 299 {
 300     int ret;
 301     VqInfoBlock info;
 302     uint8_t status;
 303     VirtioFeatDesc features;
 304     void *config;
 305     hwaddr indicators;
 306     VqConfigBlock vq_config;
 307     VirtioCcwDevice *dev = sch->driver_data;
 308     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
 309     bool check_len;
 310     int len;
 311     hwaddr hw_len;
 312     VirtioThinintInfo *thinint;
 313
 314     if (!dev) {
 315         return -EINVAL;
 316     }
 317
 318     trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid,
 319                                    ccw.cmd_code);
 320     check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
 321
 322     /* Look at the command. */
 323     switch (ccw.cmd_code) {
 324     case CCW_CMD_SET_VQ:
 325         if (check_len) {
 326             if (ccw.count != sizeof(info)) {
 327                 ret = -EINVAL;
 328                 break;
 329             }
 330         } else if (ccw.count < sizeof(info)) {
 331             /* Can't execute command. */
 332             ret = -EINVAL;
 333             break;
 334         }
 335         if (!ccw.cda) {
 336             ret = -EFAULT;
 337         } else {
 338             info.queue = address_space_ldq(&address_space_memory, ccw.cda,
 339                                            MEMTXATTRS_UNSPECIFIED, NULL);
 340             info.align = address_space_ldl(&address_space_memory,
 341                                            ccw.cda + sizeof(info.queue),
 342                                            MEMTXATTRS_UNSPECIFIED,
 343                                            NULL);
 344             info.index = address_space_lduw(&address_space_memory,
 345                                             ccw.cda + sizeof(info.queue)
 346                                             + sizeof(info.align),
 347                                             MEMTXATTRS_UNSPECIFIED,
 348                                             NULL);
 349             info.num = address_space_lduw(&address_space_memory,
 350                                           ccw.cda + sizeof(info.queue)
 351                                           + sizeof(info.align)
 352                                           + sizeof(info.index),
 353                                           MEMTXATTRS_UNSPECIFIED,
 354                                           NULL);
 355             ret = virtio_ccw_set_vqs(sch, info.queue, info.align, info.index,
 356                                      info.num);
 357             sch->curr_status.scsw.count = 0;
 358         }
 359         break;
 360     case CCW_CMD_VDEV_RESET:
 361         virtio_ccw_stop_ioeventfd(dev);
 362         virtio_reset(vdev);
 363         ret = 0;
 364         break;
 365     case CCW_CMD_READ_FEAT:
 366         if (check_len) {
 367             if (ccw.count != sizeof(features)) {
 368                 ret = -EINVAL;
 369                 break;
 370             }
 371         } else if (ccw.count < sizeof(features)) {
 372             /* Can't execute command. */
 373             ret = -EINVAL;
 374             break;
 375         }
 376         if (!ccw.cda) {
 377             ret = -EFAULT;
 378         } else {
 379             features.index = address_space_ldub(&address_space_memory,
 380                                                 ccw.cda
 381                                                 + sizeof(features.features),
 382                                                 MEMTXATTRS_UNSPECIFIED,
 383                                                 NULL);
 384             if (features.index == 0) {
 385                 features.features = vdev->host_features;
 386             } else {
 387                 /* Return zeroes if the guest supports more feature bits. */
 388                 features.features = 0;
 389             }
 390             address_space_stl_le(&address_space_memory, ccw.cda,
 391                                  features.features, MEMTXATTRS_UNSPECIFIED,
 392                                  NULL);
 393             sch->curr_status.scsw.count = ccw.count - sizeof(features);
 394             ret = 0;
 395         }
 396         break;
 397     case CCW_CMD_WRITE_FEAT:
 398         if (check_len) {
 399             if (ccw.count != sizeof(features)) {
 400                 ret = -EINVAL;
 401                 break;
 402             }
 403         } else if (ccw.count < sizeof(features)) {
 404             /* Can't execute command. */
 405             ret = -EINVAL;
 406             break;
 407         }
 408         if (!ccw.cda) {
 409             ret = -EFAULT;
 410         } else {
 411             features.index = address_space_ldub(&address_space_memory,
 412                                                 ccw.cda
 413                                                 + sizeof(features.features),
 414                                                 MEMTXATTRS_UNSPECIFIED,
 415                                                 NULL);
 416             features.features = address_space_ldl_le(&address_space_memory,
 417                                                      ccw.cda,
 418                                                      MEMTXATTRS_UNSPECIFIED,
 419                                                      NULL);
 420             if (features.index == 0) {
 421                 virtio_set_features(vdev, features.features);
 422             } else {
 423                 /*
 424                  * If the guest supports more feature bits, assert that it
 425                  * passes us zeroes for those we don't support.
 426                  */
 427                 if (features.features) {
 428                     fprintf(stderr, "Guest bug: features[%i]=%x (expected 0)\n",
 429                             features.index, features.features);
 430                     /* XXX: do a unit check here? */
 431                 }
 432             }
 433             sch->curr_status.scsw.count = ccw.count - sizeof(features);
 434             ret = 0;
 435         }
 436         break;
 437     case CCW_CMD_READ_CONF:
 438         if (check_len) {
 439             if (ccw.count > vdev->config_len) {
 440                 ret = -EINVAL;
 441                 break;
 442             }
 443         }
 444         len = MIN(ccw.count, vdev->config_len);
 445         if (!ccw.cda) {
 446             ret = -EFAULT;
 447         } else {
 448             virtio_bus_get_vdev_config(&dev->bus, vdev->config);
 449             /* XXX config space endianness */
 450             cpu_physical_memory_write(ccw.cda, vdev->config, len);
 451             sch->curr_status.scsw.count = ccw.count - len;
 452             ret = 0;
 453         }
 454         break;
 455     case CCW_CMD_WRITE_CONF:
 456         if (check_len) {
 457             if (ccw.count > vdev->config_len) {
 458                 ret = -EINVAL;
 459                 break;
 460             }
 461         }
 462         len = MIN(ccw.count, vdev->config_len);
 463         hw_len = len;
 464         if (!ccw.cda) {
 465             ret = -EFAULT;
 466         } else {
 467             config = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 468             if (!config) {
 469                 ret = -EFAULT;
 470             } else {
 471                 len = hw_len;
 472                 /* XXX config space endianness */
 473                 memcpy(vdev->config, config, len);
 474                 cpu_physical_memory_unmap(config, hw_len, 0, hw_len);
 475                 virtio_bus_set_vdev_config(&dev->bus, vdev->config);
 476                 sch->curr_status.scsw.count = ccw.count - len;
 477                 ret = 0;
 478             }
 479         }
 480         break;
 481     case CCW_CMD_WRITE_STATUS:
 482         if (check_len) {
 483             if (ccw.count != sizeof(status)) {
 484                 ret = -EINVAL;
 485                 break;
 486             }
 487         } else if (ccw.count < sizeof(status)) {
 488             /* Can't execute command. */
 489             ret = -EINVAL;
 490             break;
 491         }
 492         if (!ccw.cda) {
 493             ret = -EFAULT;
 494         } else {
 495             status = address_space_ldub(&address_space_memory, ccw.cda,
 496                                         MEMTXATTRS_UNSPECIFIED, NULL);
 497             if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 498                 virtio_ccw_stop_ioeventfd(dev);
 499             }
 500             if (virtio_set_status(vdev, status) == 0) {
 501                 if (vdev->status == 0) {
 502                     virtio_reset(vdev);
 503                 }
 504                 if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
 505                     virtio_ccw_start_ioeventfd(dev);
 506                 }
 507                 sch->curr_status.scsw.count = ccw.count - sizeof(status);
 508                 ret = 0;
 509             } else {
 510                 /* Trigger a command reject. */
 511                 ret = -ENOSYS;
 512             }
 513         }
 514         break;
 515     case CCW_CMD_SET_IND:
 516         if (check_len) {
 517             if (ccw.count != sizeof(indicators)) {
 518                 ret = -EINVAL;
 519                 break;
 520             }
 521         } else if (ccw.count < sizeof(indicators)) {
 522             /* Can't execute command. */
 523             ret = -EINVAL;
 524             break;
 525         }
 526         if (sch->thinint_active) {
 527             /* Trigger a command reject. */
 528             ret = -ENOSYS;
 529             break;
 530         }
 531         if (!ccw.cda) {
 532             ret = -EFAULT;
 533         } else {
 534             indicators = address_space_ldq_be(&address_space_memory, ccw.cda,
 535                                               MEMTXATTRS_UNSPECIFIED, NULL);
 536             dev->indicators = get_indicator(indicators, sizeof(uint64_t));
 537             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 538             ret = 0;
 539         }
 540         break;
 541     case CCW_CMD_SET_CONF_IND:
 542         if (check_len) {
 543             if (ccw.count != sizeof(indicators)) {
 544                 ret = -EINVAL;
 545                 break;
 546             }
 547         } else if (ccw.count < sizeof(indicators)) {
 548             /* Can't execute command. */
 549             ret = -EINVAL;
 550             break;
 551         }
 552         if (!ccw.cda) {
 553             ret = -EFAULT;
 554         } else {
 555             indicators = address_space_ldq_be(&address_space_memory, ccw.cda,
 556                                               MEMTXATTRS_UNSPECIFIED, NULL);
 557             dev->indicators2 = get_indicator(indicators, sizeof(uint64_t));
 558             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 559             ret = 0;
 560         }
 561         break;
 562     case CCW_CMD_READ_VQ_CONF:
 563         if (check_len) {
 564             if (ccw.count != sizeof(vq_config)) {
 565                 ret = -EINVAL;
 566                 break;
 567             }
 568         } else if (ccw.count < sizeof(vq_config)) {
 569             /* Can't execute command. */
 570             ret = -EINVAL;
 571             break;
 572         }
 573         if (!ccw.cda) {
 574             ret = -EFAULT;
 575         } else {
 576             vq_config.index = address_space_lduw_be(&address_space_memory,
 577                                                     ccw.cda,
 578                                                     MEMTXATTRS_UNSPECIFIED,
 579                                                     NULL);
 580             if (vq_config.index >= VIRTIO_CCW_QUEUE_MAX) {
 581                 ret = -EINVAL;
 582                 break;
 583             }
 584             vq_config.num_max = virtio_queue_get_num(vdev,
 585                                                      vq_config.index);
 586             address_space_stw_be(&address_space_memory,
 587                                  ccw.cda + sizeof(vq_config.index),
 588                                  vq_config.num_max,
 589                                  MEMTXATTRS_UNSPECIFIED,
 590                                  NULL);
 591             sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
 592             ret = 0;
 593         }
 594         break;
 595     case CCW_CMD_SET_IND_ADAPTER:
 596         if (check_len) {
 597             if (ccw.count != sizeof(*thinint)) {
 598                 ret = -EINVAL;
 599                 break;
 600             }
 601         } else if (ccw.count < sizeof(*thinint)) {
 602             /* Can't execute command. */
 603             ret = -EINVAL;
 604             break;
 605         }
 606         len = sizeof(*thinint);
 607         hw_len = len;
 608         if (!ccw.cda) {
 609             ret = -EFAULT;
 610         } else if (dev->indicators && !sch->thinint_active) {
 611             /* Trigger a command reject. */
 612             ret = -ENOSYS;
 613         } else {
 614             thinint = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 615             if (!thinint) {
 616                 ret = -EFAULT;
 617             } else {
 618                 uint64_t ind_bit = ldq_be_p(&thinint->ind_bit);
 619
 620                 len = hw_len;
 621                 dev->summary_indicator =
 622                     get_indicator(ldq_be_p(&thinint->summary_indicator),
 623                                   sizeof(uint8_t));
 624                 dev->indicators =
 625                     get_indicator(ldq_be_p(&thinint->device_indicator),
 626                                   ind_bit / 8 + 1);
 627                 dev->thinint_isc = thinint->isc;
 628                 dev->routes.adapter.ind_offset = ind_bit;
 629                 dev->routes.adapter.summary_offset = 7;
 630                 cpu_physical_memory_unmap(thinint, hw_len, 0, hw_len);
 631                 ret = css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
 632                                               dev->thinint_isc, true, false,
 633                                               &dev->routes.adapter.adapter_id);
 634                 assert(ret == 0);
 635                 sch->thinint_active = ((dev->indicators != NULL) &&
 636                                        (dev->summary_indicator != NULL));
 637                 sch->curr_status.scsw.count = ccw.count - len;
 638                 ret = 0;
 639             }
 640         }
 641         break;
 642     default:
 643         ret = -ENOSYS;
 644         break;
 645     }
 646     return ret;
 647 }
 648
 649 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
 650 {
 651     unsigned int cssid = 0;
 652     unsigned int ssid = 0;
 653     unsigned int schid;
 654     unsigned int devno;
 655     bool have_devno = false;
 656     bool found = false;
 657     SubchDev *sch;
 658     int num;
 659     Error *err = NULL;
 660     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
 661
 662     sch = g_malloc0(sizeof(SubchDev));
 663
 664     sch->driver_data = dev;
 665     dev->sch = sch;
 666
 667     dev->indicators = NULL;
 668
 669     /* Initialize subchannel structure. */
 670     sch->channel_prog = 0x0;
 671     sch->last_cmd_valid = false;
 672     sch->thinint_active = false;
 673     /*
 674      * Use a device number if provided. Otherwise, fall back to subchannel
 675      * number.
 676      */
 677     if (dev->bus_id) {
 678         num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno);
 679         if (num == 3) {
 680             if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
 681                 error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x",
 682                            cssid, ssid);
 683                 goto out_err;
 684             }
 685             /* Enforce use of virtual cssid. */
 686             if (cssid != VIRTUAL_CSSID) {
 687                 error_setg(errp, "cssid %x not valid for virtio devices",
 688                            cssid);
 689                 goto out_err;
 690             }
 691             if (css_devno_used(cssid, ssid, devno)) {
 692                 error_setg(errp, "Device %x.%x.%04x already exists",
 693                            cssid, ssid, devno);
 694                 goto out_err;
 695             }
 696             sch->cssid = cssid;
 697             sch->ssid = ssid;
 698             sch->devno = devno;
 699             have_devno = true;
 700         } else {
 701             error_setg(errp, "Malformed devno parameter '%s'", dev->bus_id);
 702             goto out_err;
 703         }
 704     }
 705
 706     /* Find the next free id. */
 707     if (have_devno) {
 708         for (schid = 0; schid <= MAX_SCHID; schid++) {
 709             if (!css_find_subch(1, cssid, ssid, schid)) {
 710                 sch->schid = schid;
 711                 css_subch_assign(cssid, ssid, schid, devno, sch);
 712                 found = true;
 713                 break;
 714             }
 715         }
 716         if (!found) {
 717             error_setg(errp, "No free subchannel found for %x.%x.%04x",
 718                        cssid, ssid, devno);
 719             goto out_err;
 720         }
 721         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 722                                     "user-configured");
 723     } else {
 724         cssid = VIRTUAL_CSSID;
 725         for (ssid = 0; ssid <= MAX_SSID; ssid++) {
 726             for (schid = 0; schid <= MAX_SCHID; schid++) {
 727                 if (!css_find_subch(1, cssid, ssid, schid)) {
 728                     sch->cssid = cssid;
 729                     sch->ssid = ssid;
 730                     sch->schid = schid;
 731                     devno = schid;
 732                     /*
 733                      * If the devno is already taken, look further in this
 734                      * subchannel set.
 735                      */
 736                     while (css_devno_used(cssid, ssid, devno)) {
 737                         if (devno == MAX_SCHID) {
 738                             devno = 0;
 739                         } else if (devno == schid - 1) {
 740                             error_setg(errp, "No free devno found");
 741                             goto out_err;
 742                         } else {
 743                             devno++;
 744                         }
 745                     }
 746                     sch->devno = devno;
 747                     css_subch_assign(cssid, ssid, schid, devno, sch);
 748                     found = true;
 749                     break;
 750                 }
 751             }
 752             if (found) {
 753                 break;
 754             }
 755         }
 756         if (!found) {
 757             error_setg(errp, "Virtual channel subsystem is full!");
 758             goto out_err;
 759         }
 760         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 761                                     "auto-configured");
 762     }
 763
 764     /* Build initial schib. */
 765     css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
 766
 767     sch->ccw_cb = virtio_ccw_cb;
 768
 769     /* Build senseid data. */
 770     memset(&sch->id, 0, sizeof(SenseId));
 771     sch->id.reserved = 0xff;
 772     sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
 773
 774     if (k->realize) {
 775         k->realize(dev, &err);
 776     }
 777     if (err) {
 778         error_propagate(errp, err);
 779         css_subch_assign(cssid, ssid, schid, devno, NULL);
 780         goto out_err;
 781     }
 782
 783     return;
 784
 785 out_err:
 786     dev->sch = NULL;
 787     g_free(sch);
 788 }
 789
 790 static int virtio_ccw_exit(VirtioCcwDevice *dev)
 791 {
 792     SubchDev *sch = dev->sch;
 793
 794     if (sch) {
 795         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 796         g_free(sch);
 797     }
 798     if (dev->indicators) {
 799         release_indicator(&dev->routes.adapter, dev->indicators);
 800         dev->indicators = NULL;
 801     }
 802     return 0;
 803 }
 804
 805 static void virtio_ccw_net_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 806 {
 807     DeviceState *qdev = DEVICE(ccw_dev);
 808     VirtIONetCcw *dev = VIRTIO_NET_CCW(ccw_dev);
 809     DeviceState *vdev = DEVICE(&dev->vdev);
 810     Error *err = NULL;
 811
 812     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
 813                                   object_get_typename(OBJECT(qdev)));
 814     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 815     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 816     if (err) {
 817         error_propagate(errp, err);
 818     }
 819 }
 820
 821 static void virtio_ccw_net_instance_init(Object *obj)
 822 {
 823     VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
 824
 825     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 826                                 TYPE_VIRTIO_NET);
 827     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 828                               "bootindex", &error_abort);
 829 }
 830
 831 static void virtio_ccw_blk_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 832 {
 833     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(ccw_dev);
 834     DeviceState *vdev = DEVICE(&dev->vdev);
 835     Error *err = NULL;
 836
 837     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 838     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 839     if (err) {
 840         error_propagate(errp, err);
 841     }
 842 }
 843
 844 static void virtio_ccw_blk_instance_init(Object *obj)
 845 {
 846     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(obj);
 847
 848     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 849                                 TYPE_VIRTIO_BLK);
 850     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
 851                               &error_abort);
 852     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 853                               "bootindex", &error_abort);
 854 }
 855
 856 static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 857 {
 858     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(ccw_dev);
 859     DeviceState *vdev = DEVICE(&dev->vdev);
 860     DeviceState *proxy = DEVICE(ccw_dev);
 861     Error *err = NULL;
 862     char *bus_name;
 863
 864     /*
 865      * For command line compatibility, this sets the virtio-serial-device bus
 866      * name as before.
 867      */
 868     if (proxy->id) {
 869         bus_name = g_strdup_printf("%s.0", proxy->id);
 870         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 871         g_free(bus_name);
 872     }
 873
 874     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 875     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 876     if (err) {
 877         error_propagate(errp, err);
 878     }
 879 }
 880
 881
 882 static void virtio_ccw_serial_instance_init(Object *obj)
 883 {
 884     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(obj);
 885
 886     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 887                                 TYPE_VIRTIO_SERIAL);
 888 }
 889
 890 static void virtio_ccw_balloon_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 891 {
 892     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(ccw_dev);
 893     DeviceState *vdev = DEVICE(&dev->vdev);
 894     Error *err = NULL;
 895
 896     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 897     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 898     if (err) {
 899         error_propagate(errp, err);
 900     }
 901 }
 902
 903 static void virtio_ccw_balloon_instance_init(Object *obj)
 904 {
 905     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(obj);
 906
 907     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 908                                 TYPE_VIRTIO_BALLOON);
 909     object_property_add_alias(obj, "guest-stats", OBJECT(&dev->vdev),
 910                               "guest-stats", &error_abort);
 911     object_property_add_alias(obj, "guest-stats-polling-interval",
 912                               OBJECT(&dev->vdev),
 913                               "guest-stats-polling-interval", &error_abort);
 914 }
 915
 916 static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 917 {
 918     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
 919     DeviceState *vdev = DEVICE(&dev->vdev);
 920     DeviceState *qdev = DEVICE(ccw_dev);
 921     Error *err = NULL;
 922     char *bus_name;
 923
 924     /*
 925      * For command line compatibility, this sets the virtio-scsi-device bus
 926      * name as before.
 927      */
 928     if (qdev->id) {
 929         bus_name = g_strdup_printf("%s.0", qdev->id);
 930         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 931         g_free(bus_name);
 932     }
 933
 934     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 935     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 936     if (err) {
 937         error_propagate(errp, err);
 938     }
 939 }
 940
 941 static void virtio_ccw_scsi_instance_init(Object *obj)
 942 {
 943     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(obj);
 944
 945     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 946                                 TYPE_VIRTIO_SCSI);
 947     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev), "iothread",
 948                               &error_abort);
 949 }
 950
 951 #ifdef CONFIG_VHOST_SCSI
 952 static void vhost_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 953 {
 954     VHostSCSICcw *dev = VHOST_SCSI_CCW(ccw_dev);
 955     DeviceState *vdev = DEVICE(&dev->vdev);
 956     Error *err = NULL;
 957
 958     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 959     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 960     if (err) {
 961         error_propagate(errp, err);
 962     }
 963 }
 964
 965 static void vhost_ccw_scsi_instance_init(Object *obj)
 966 {
 967     VHostSCSICcw *dev = VHOST_SCSI_CCW(obj);
 968
 969     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 970                                 TYPE_VHOST_SCSI);
 971 }
 972 #endif
 973
 974 static void virtio_ccw_rng_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 975 {
 976     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(ccw_dev);
 977     DeviceState *vdev = DEVICE(&dev->vdev);
 978     Error *err = NULL;
 979
 980     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 981     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 982     if (err) {
 983         error_propagate(errp, err);
 984         return;
 985     }
 986
 987     object_property_set_link(OBJECT(dev),
 988                              OBJECT(dev->vdev.conf.rng), "rng",
 989                              NULL);
 990 }
 991
 992 /* DeviceState to VirtioCcwDevice. Note: used on datapath,
 993  * be careful and test performance if you change this.
 994  */
 995 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d)
 996 {
 997     return container_of(d, VirtioCcwDevice, parent_obj);
 998 }
 999
1000 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
1001                                      uint8_t to_be_set)
1002 {
1003     uint8_t ind_old, ind_new;
1004     hwaddr len = 1;
1005     uint8_t *ind_addr;
1006
1007     ind_addr = cpu_physical_memory_map(ind_loc, &len, 1);
1008     if (!ind_addr) {
1009         error_report("%s(%x.%x.%04x): unable to access indicator",
1010                      __func__, sch->cssid, sch->ssid, sch->schid);
1011         return -1;
1012     }
1013     do {
1014         ind_old = *ind_addr;
1015         ind_new = ind_old | to_be_set;
1016     } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
1017     cpu_physical_memory_unmap(ind_addr, len, 1, len);
1018
1019     return ind_old;
1020 }
1021
1022 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
1023 {
1024     VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
1025     SubchDev *sch = dev->sch;
1026     uint64_t indicators;
1027
1028     if (vector >= 128) {
1029         return;
1030     }
1031
1032     if (vector < VIRTIO_CCW_QUEUE_MAX) {
1033         if (!dev->indicators) {
1034             return;
1035         }
1036         if (sch->thinint_active) {
1037             /*
1038              * In the adapter interrupt case, indicators points to a
1039              * memory area that may be (way) larger than 64 bit and
1040              * ind_bit indicates the start of the indicators in a big
1041              * endian notation.
1042              */
1043             uint64_t ind_bit = dev->routes.adapter.ind_offset;
1044
1045             virtio_set_ind_atomic(sch, dev->indicators->addr +
1046                                   (ind_bit + vector) / 8,
1047                                   0x80 >> ((ind_bit + vector) % 8));
1048             if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr,
1049                                        0x01)) {
1050                 css_adapter_interrupt(dev->thinint_isc);
1051             }
1052         } else {
1053             indicators = address_space_ldq(&address_space_memory,
1054                                            dev->indicators->addr,
1055                                            MEMTXATTRS_UNSPECIFIED,
1056                                            NULL);
1057             indicators |= 1ULL << vector;
1058             address_space_stq(&address_space_memory, dev->indicators->addr,
1059                               indicators, MEMTXATTRS_UNSPECIFIED, NULL);
1060             css_conditional_io_interrupt(sch);
1061         }
1062     } else {
1063         if (!dev->indicators2) {
1064             return;
1065         }
1066         vector = 0;
1067         indicators = address_space_ldq(&address_space_memory,
1068                                        dev->indicators2->addr,
1069                                        MEMTXATTRS_UNSPECIFIED,
1070                                        NULL);
1071         indicators |= 1ULL << vector;
1072         address_space_stq(&address_space_memory, dev->indicators2->addr,
1073                           indicators, MEMTXATTRS_UNSPECIFIED, NULL);
1074         css_conditional_io_interrupt(sch);
1075     }
1076 }
1077
1078 static void virtio_ccw_reset(DeviceState *d)
1079 {
1080     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1081     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1082
1083     virtio_ccw_stop_ioeventfd(dev);
1084     virtio_reset(vdev);
1085     css_reset_sch(dev->sch);
1086     if (dev->indicators) {
1087         release_indicator(&dev->routes.adapter, dev->indicators);
1088         dev->indicators = NULL;
1089     }
1090     if (dev->indicators2) {
1091         release_indicator(&dev->routes.adapter, dev->indicators2);
1092         dev->indicators2 = NULL;
1093     }
1094     if (dev->summary_indicator) {
1095         release_indicator(&dev->routes.adapter, dev->summary_indicator);
1096         dev->summary_indicator = NULL;
1097     }
1098 }
1099
1100 static void virtio_ccw_vmstate_change(DeviceState *d, bool running)
1101 {
1102     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1103
1104     if (running) {
1105         virtio_ccw_start_ioeventfd(dev);
1106     } else {
1107         virtio_ccw_stop_ioeventfd(dev);
1108     }
1109 }
1110
1111 static bool virtio_ccw_query_guest_notifiers(DeviceState *d)
1112 {
1113     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1114
1115     return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA);
1116 }
1117
1118 static int virtio_ccw_set_host_notifier(DeviceState *d, int n, bool assign)
1119 {
1120     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1121
1122     /* Stop using the generic ioeventfd, we are doing eventfd handling
1123      * ourselves below */
1124     dev->ioeventfd_disabled = assign;
1125     if (assign) {
1126         virtio_ccw_stop_ioeventfd(dev);
1127     }
1128     return virtio_ccw_set_guest2host_notifier(dev, n, assign, false);
1129 }
1130
1131 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev)
1132 {
1133     int r;
1134
1135     if (!dev->sch->thinint_active) {
1136         return -EINVAL;
1137     }
1138
1139     r = map_indicator(&dev->routes.adapter, dev->summary_indicator);
1140     if (r) {
1141         return r;
1142     }
1143     r = map_indicator(&dev->routes.adapter, dev->indicators);
1144     if (r) {
1145         return r;
1146     }
1147     dev->routes.adapter.summary_addr = dev->summary_indicator->map;
1148     dev->routes.adapter.ind_addr = dev->indicators->map;
1149
1150     return 0;
1151 }
1152
1153 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs)
1154 {
1155     int i;
1156     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1157     int ret;
1158     S390FLICState *fs = s390_get_flic();
1159     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1160
1161     ret = virtio_ccw_get_mappings(dev);
1162     if (ret) {
1163         return ret;
1164     }
1165     for (i = 0; i < nvqs; i++) {
1166         if (!virtio_queue_get_num(vdev, i)) {
1167             break;
1168         }
1169     }
1170     dev->routes.num_routes = i;
1171     return fsc->add_adapter_routes(fs, &dev->routes);
1172 }
1173
1174 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs)
1175 {
1176     S390FLICState *fs = s390_get_flic();
1177     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1178
1179     fsc->release_adapter_routes(fs, &dev->routes);
1180 }
1181
1182 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n)
1183 {
1184     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1185     VirtQueue *vq = virtio_get_queue(vdev, n);
1186     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1187
1188     return kvm_irqchip_add_irqfd_notifier(kvm_state, notifier, NULL,
1189                                           dev->routes.gsi[n]);
1190 }
1191
1192 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n)
1193 {
1194     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1195     VirtQueue *vq = virtio_get_queue(vdev, n);
1196     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1197     int ret;
1198
1199     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, notifier,
1200                                             dev->routes.gsi[n]);
1201     assert(ret == 0);
1202 }
1203
1204 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
1205                                          bool assign, bool with_irqfd)
1206 {
1207     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1208     VirtQueue *vq = virtio_get_queue(vdev, n);
1209     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1210     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
1211
1212     if (assign) {
1213         int r = event_notifier_init(notifier, 0);
1214
1215         if (r < 0) {
1216             return r;
1217         }
1218         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
1219         if (with_irqfd) {
1220             r = virtio_ccw_add_irqfd(dev, n);
1221             if (r) {
1222                 virtio_queue_set_guest_notifier_fd_handler(vq, false,
1223                                                            with_irqfd);
1224                 return r;
1225             }
1226         }
1227         /*
1228          * We do not support individual masking for channel devices, so we
1229          * need to manually trigger any guest masking callbacks here.
1230          */
1231         if (k->guest_notifier_mask) {
1232             k->guest_notifier_mask(vdev, n, false);
1233         }
1234         /* get lost events and re-inject */
1235         if (k->guest_notifier_pending &&
1236             k->guest_notifier_pending(vdev, n)) {
1237             event_notifier_set(notifier);
1238         }
1239     } else {
1240         if (k->guest_notifier_mask) {
1241             k->guest_notifier_mask(vdev, n, true);
1242         }
1243         if (with_irqfd) {
1244             virtio_ccw_remove_irqfd(dev, n);
1245         }
1246         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
1247         event_notifier_cleanup(notifier);
1248     }
1249     return 0;
1250 }
1251
1252 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs,
1253                                           bool assigned)
1254 {
1255     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1256     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1257     bool with_irqfd = dev->sch->thinint_active && kvm_irqfds_enabled();
1258     int r, n;
1259
1260     if (with_irqfd && assigned) {
1261         /* irq routes need to be set up before assigning irqfds */
1262         r = virtio_ccw_setup_irqroutes(dev, nvqs);
1263         if (r < 0) {
1264             goto irqroute_error;
1265         }
1266     }
1267     for (n = 0; n < nvqs; n++) {
1268         if (!virtio_queue_get_num(vdev, n)) {
1269             break;
1270         }
1271         r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd);
1272         if (r < 0) {
1273             goto assign_error;
1274         }
1275     }
1276     if (with_irqfd && !assigned) {
1277         /* release irq routes after irqfds have been released */
1278         virtio_ccw_release_irqroutes(dev, nvqs);
1279     }
1280     return 0;
1281
1282 assign_error:
1283     while (--n >= 0) {
1284         virtio_ccw_set_guest_notifier(dev, n, !assigned, false);
1285     }
1286 irqroute_error:
1287     if (with_irqfd && assigned) {
1288         virtio_ccw_release_irqroutes(dev, nvqs);
1289     }
1290     return r;
1291 }
1292
1293 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f)
1294 {
1295     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1296     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1297
1298     qemu_put_be16(f, virtio_queue_vector(vdev, n));
1299 }
1300
1301 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f)
1302 {
1303     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1304     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1305     uint16_t vector;
1306
1307     qemu_get_be16s(f, &vector);
1308     virtio_queue_set_vector(vdev, n , vector);
1309
1310     return 0;
1311 }
1312
1313 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
1314 {
1315     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1316     SubchDev *s = dev->sch;
1317
1318     subch_device_save(s, f);
1319     if (dev->indicators != NULL) {
1320         qemu_put_be32(f, dev->indicators->len);
1321         qemu_put_be64(f, dev->indicators->addr);
1322     } else {
1323         qemu_put_be32(f, 0);
1324         qemu_put_be64(f, 0UL);
1325     }
1326     if (dev->indicators2 != NULL) {
1327         qemu_put_be32(f, dev->indicators2->len);
1328         qemu_put_be64(f, dev->indicators2->addr);
1329     } else {
1330         qemu_put_be32(f, 0);
1331         qemu_put_be64(f, 0UL);
1332     }
1333     if (dev->summary_indicator != NULL) {
1334         qemu_put_be32(f, dev->summary_indicator->len);
1335         qemu_put_be64(f, dev->summary_indicator->addr);
1336     } else {
1337         qemu_put_be32(f, 0);
1338         qemu_put_be64(f, 0UL);
1339     }
1340     qemu_put_be64(f, dev->routes.adapter.ind_offset);
1341     qemu_put_byte(f, dev->thinint_isc);
1342 }
1343
1344 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
1345 {
1346     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1347     SubchDev *s = dev->sch;
1348     int len;
1349
1350     s->driver_data = dev;
1351     subch_device_load(s, f);
1352     len = qemu_get_be32(f);
1353     if (len != 0) {
1354         dev->indicators = get_indicator(qemu_get_be64(f), len);
1355     } else {
1356         qemu_get_be64(f);
1357         dev->indicators = NULL;
1358     }
1359     len = qemu_get_be32(f);
1360     if (len != 0) {
1361         dev->indicators2 = get_indicator(qemu_get_be64(f), len);
1362     } else {
1363         qemu_get_be64(f);
1364         dev->indicators2 = NULL;
1365     }
1366     len = qemu_get_be32(f);
1367     if (len != 0) {
1368         dev->summary_indicator = get_indicator(qemu_get_be64(f), len);
1369     } else {
1370         qemu_get_be64(f);
1371         dev->summary_indicator = NULL;
1372     }
1373     dev->routes.adapter.ind_offset = qemu_get_be64(f);
1374     dev->thinint_isc = qemu_get_byte(f);
1375     if (s->thinint_active) {
1376         return css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
1377                                        dev->thinint_isc, true, false,
1378                                        &dev->routes.adapter.adapter_id);
1379     }
1380
1381     return 0;
1382 }
1383
1384 /* This is called by virtio-bus just after the device is plugged. */
1385 static void virtio_ccw_device_plugged(DeviceState *d, Error **errp)
1386 {
1387     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1388     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1389     SubchDev *sch = dev->sch;
1390     int n = virtio_get_num_queues(vdev);
1391
1392     if (virtio_get_num_queues(vdev) > VIRTIO_CCW_QUEUE_MAX) {
1393         error_setg(errp, "The nubmer of virtqueues %d "
1394                    "exceeds ccw limit %d", n,
1395                    VIRTIO_CCW_QUEUE_MAX);
1396         return;
1397     }
1398
1399     sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
1400
1401     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
1402                           d->hotplugged, 1);
1403 }
1404
1405 static void virtio_ccw_device_unplugged(DeviceState *d)
1406 {
1407     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1408
1409     virtio_ccw_stop_ioeventfd(dev);
1410 }
1411 /**************** Virtio-ccw Bus Device Descriptions *******************/
1412
1413 static Property virtio_ccw_net_properties[] = {
1414     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1415     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1416                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1417     DEFINE_PROP_END_OF_LIST(),
1418 };
1419
1420 static void virtio_ccw_net_class_init(ObjectClass *klass, void *data)
1421 {
1422     DeviceClass *dc = DEVICE_CLASS(klass);
1423     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1424
1425     k->realize = virtio_ccw_net_realize;
1426     k->exit = virtio_ccw_exit;
1427     dc->reset = virtio_ccw_reset;
1428     dc->props = virtio_ccw_net_properties;
1429     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1430 }
1431
1432 static const TypeInfo virtio_ccw_net = {
1433     .name          = TYPE_VIRTIO_NET_CCW,
1434     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1435     .instance_size = sizeof(VirtIONetCcw),
1436     .instance_init = virtio_ccw_net_instance_init,
1437     .class_init    = virtio_ccw_net_class_init,
1438 };
1439
1440 static Property virtio_ccw_blk_properties[] = {
1441     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1442     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1443                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1444     DEFINE_PROP_END_OF_LIST(),
1445 };
1446
1447 static void virtio_ccw_blk_class_init(ObjectClass *klass, void *data)
1448 {
1449     DeviceClass *dc = DEVICE_CLASS(klass);
1450     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1451
1452     k->realize = virtio_ccw_blk_realize;
1453     k->exit = virtio_ccw_exit;
1454     dc->reset = virtio_ccw_reset;
1455     dc->props = virtio_ccw_blk_properties;
1456     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1457 }
1458
1459 static const TypeInfo virtio_ccw_blk = {
1460     .name          = TYPE_VIRTIO_BLK_CCW,
1461     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1462     .instance_size = sizeof(VirtIOBlkCcw),
1463     .instance_init = virtio_ccw_blk_instance_init,
1464     .class_init    = virtio_ccw_blk_class_init,
1465 };
1466
1467 static Property virtio_ccw_serial_properties[] = {
1468     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1469     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1470                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1471     DEFINE_PROP_END_OF_LIST(),
1472 };
1473
1474 static void virtio_ccw_serial_class_init(ObjectClass *klass, void *data)
1475 {
1476     DeviceClass *dc = DEVICE_CLASS(klass);
1477     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1478
1479     k->realize = virtio_ccw_serial_realize;
1480     k->exit = virtio_ccw_exit;
1481     dc->reset = virtio_ccw_reset;
1482     dc->props = virtio_ccw_serial_properties;
1483     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
1484 }
1485
1486 static const TypeInfo virtio_ccw_serial = {
1487     .name          = TYPE_VIRTIO_SERIAL_CCW,
1488     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1489     .instance_size = sizeof(VirtioSerialCcw),
1490     .instance_init = virtio_ccw_serial_instance_init,
1491     .class_init    = virtio_ccw_serial_class_init,
1492 };
1493
1494 static Property virtio_ccw_balloon_properties[] = {
1495     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1496     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1497                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1498     DEFINE_PROP_END_OF_LIST(),
1499 };
1500
1501 static void virtio_ccw_balloon_class_init(ObjectClass *klass, void *data)
1502 {
1503     DeviceClass *dc = DEVICE_CLASS(klass);
1504     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1505
1506     k->realize = virtio_ccw_balloon_realize;
1507     k->exit = virtio_ccw_exit;
1508     dc->reset = virtio_ccw_reset;
1509     dc->props = virtio_ccw_balloon_properties;
1510     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1511 }
1512
1513 static const TypeInfo virtio_ccw_balloon = {
1514     .name          = TYPE_VIRTIO_BALLOON_CCW,
1515     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1516     .instance_size = sizeof(VirtIOBalloonCcw),
1517     .instance_init = virtio_ccw_balloon_instance_init,
1518     .class_init    = virtio_ccw_balloon_class_init,
1519 };
1520
1521 static Property virtio_ccw_scsi_properties[] = {
1522     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1523     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1524                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1525     DEFINE_PROP_END_OF_LIST(),
1526 };
1527
1528 static void virtio_ccw_scsi_class_init(ObjectClass *klass, void *data)
1529 {
1530     DeviceClass *dc = DEVICE_CLASS(klass);
1531     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1532
1533     k->realize = virtio_ccw_scsi_realize;
1534     k->exit = virtio_ccw_exit;
1535     dc->reset = virtio_ccw_reset;
1536     dc->props = virtio_ccw_scsi_properties;
1537     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1538 }
1539
1540 static const TypeInfo virtio_ccw_scsi = {
1541     .name          = TYPE_VIRTIO_SCSI_CCW,
1542     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1543     .instance_size = sizeof(VirtIOSCSICcw),
1544     .instance_init = virtio_ccw_scsi_instance_init,
1545     .class_init    = virtio_ccw_scsi_class_init,
1546 };
1547
1548 #ifdef CONFIG_VHOST_SCSI
1549 static Property vhost_ccw_scsi_properties[] = {
1550     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1551     DEFINE_PROP_END_OF_LIST(),
1552 };
1553
1554 static void vhost_ccw_scsi_class_init(ObjectClass *klass, void *data)
1555 {
1556     DeviceClass *dc = DEVICE_CLASS(klass);
1557     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1558
1559     k->realize = vhost_ccw_scsi_realize;
1560     k->exit = virtio_ccw_exit;
1561     dc->reset = virtio_ccw_reset;
1562     dc->props = vhost_ccw_scsi_properties;
1563     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1564 }
1565
1566 static const TypeInfo vhost_ccw_scsi = {
1567     .name          = TYPE_VHOST_SCSI_CCW,
1568     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1569     .instance_size = sizeof(VHostSCSICcw),
1570     .instance_init = vhost_ccw_scsi_instance_init,
1571     .class_init    = vhost_ccw_scsi_class_init,
1572 };
1573 #endif
1574
1575 static void virtio_ccw_rng_instance_init(Object *obj)
1576 {
1577     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(obj);
1578
1579     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1580                                 TYPE_VIRTIO_RNG);
1581     object_property_add_alias(obj, "rng", OBJECT(&dev->vdev),
1582                               "rng", &error_abort);
1583 }
1584
1585 static Property virtio_ccw_rng_properties[] = {
1586     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1587     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1588                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1589     DEFINE_PROP_END_OF_LIST(),
1590 };
1591
1592 static void virtio_ccw_rng_class_init(ObjectClass *klass, void *data)
1593 {
1594     DeviceClass *dc = DEVICE_CLASS(klass);
1595     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1596
1597     k->realize = virtio_ccw_rng_realize;
1598     k->exit = virtio_ccw_exit;
1599     dc->reset = virtio_ccw_reset;
1600     dc->props = virtio_ccw_rng_properties;
1601     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1602 }
1603
1604 static const TypeInfo virtio_ccw_rng = {
1605     .name          = TYPE_VIRTIO_RNG_CCW,
1606     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1607     .instance_size = sizeof(VirtIORNGCcw),
1608     .instance_init = virtio_ccw_rng_instance_init,
1609     .class_init    = virtio_ccw_rng_class_init,
1610 };
1611
1612 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp)
1613 {
1614     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1615
1616     virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
1617     virtio_ccw_device_realize(_dev, errp);
1618 }
1619
1620 static int virtio_ccw_busdev_exit(DeviceState *dev)
1621 {
1622     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1623     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1624
1625     return _info->exit(_dev);
1626 }
1627
1628 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev,
1629                                      DeviceState *dev, Error **errp)
1630 {
1631     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1632     SubchDev *sch = _dev->sch;
1633
1634     virtio_ccw_stop_ioeventfd(_dev);
1635
1636     /*
1637      * We should arrive here only for device_del, since we don't support
1638      * direct hot(un)plug of channels, but only through virtio.
1639      */
1640     assert(sch != NULL);
1641     /* Subchannel is now disabled and no longer valid. */
1642     sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA |
1643                                      PMCW_FLAGS_MASK_DNV);
1644
1645     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
1646
1647     object_unparent(OBJECT(dev));
1648 }
1649
1650 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
1651 {
1652     DeviceClass *dc = DEVICE_CLASS(klass);
1653
1654     dc->realize = virtio_ccw_busdev_realize;
1655     dc->exit = virtio_ccw_busdev_exit;
1656     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
1657 }
1658
1659 static const TypeInfo virtio_ccw_device_info = {
1660     .name = TYPE_VIRTIO_CCW_DEVICE,
1661     .parent = TYPE_DEVICE,
1662     .instance_size = sizeof(VirtioCcwDevice),
1663     .class_init = virtio_ccw_device_class_init,
1664     .class_size = sizeof(VirtIOCCWDeviceClass),
1665     .abstract = true,
1666 };
1667
1668 /***************** Virtual-css Bus Bridge Device ********************/
1669 /* Only required to have the virtio bus as child in the system bus */
1670
1671 static int virtual_css_bridge_init(SysBusDevice *dev)
1672 {
1673     /* nothing */
1674     return 0;
1675 }
1676
1677 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
1678 {
1679     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
1680     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1681     DeviceClass *dc = DEVICE_CLASS(klass);
1682
1683     k->init = virtual_css_bridge_init;
1684     hc->unplug = virtio_ccw_busdev_unplug;
1685     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
1686 }
1687
1688 static const TypeInfo virtual_css_bridge_info = {
1689     .name          = "virtual-css-bridge",
1690     .parent        = TYPE_SYS_BUS_DEVICE,
1691     .instance_size = sizeof(SysBusDevice),
1692     .class_init    = virtual_css_bridge_class_init,
1693     .interfaces = (InterfaceInfo[]) {
1694         { TYPE_HOTPLUG_HANDLER },
1695         { }
1696     }
1697 };
1698
1699 /* virtio-ccw-bus */
1700
1701 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
1702                                VirtioCcwDevice *dev)
1703 {
1704     DeviceState *qdev = DEVICE(dev);
1705     char virtio_bus_name[] = "virtio-bus";
1706
1707     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS,
1708                         qdev, virtio_bus_name);
1709 }
1710
1711 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
1712 {
1713     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1714     BusClass *bus_class = BUS_CLASS(klass);
1715
1716     bus_class->max_dev = 1;
1717     k->notify = virtio_ccw_notify;
1718     k->vmstate_change = virtio_ccw_vmstate_change;
1719     k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
1720     k->set_host_notifier = virtio_ccw_set_host_notifier;
1721     k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
1722     k->save_queue = virtio_ccw_save_queue;
1723     k->load_queue = virtio_ccw_load_queue;
1724     k->save_config = virtio_ccw_save_config;
1725     k->load_config = virtio_ccw_load_config;
1726     k->device_plugged = virtio_ccw_device_plugged;
1727     k->device_unplugged = virtio_ccw_device_unplugged;
1728 }
1729
1730 static const TypeInfo virtio_ccw_bus_info = {
1731     .name = TYPE_VIRTIO_CCW_BUS,
1732     .parent = TYPE_VIRTIO_BUS,
1733     .instance_size = sizeof(VirtioCcwBusState),
1734     .class_init = virtio_ccw_bus_class_init,
1735 };
1736
1737 static void virtio_ccw_register(void)
1738 {
1739     type_register_static(&virtio_ccw_bus_info);
1740     type_register_static(&virtual_css_bus_info);
1741     type_register_static(&virtio_ccw_device_info);
1742     type_register_static(&virtio_ccw_serial);
1743     type_register_static(&virtio_ccw_blk);
1744     type_register_static(&virtio_ccw_net);
1745     type_register_static(&virtio_ccw_balloon);
1746     type_register_static(&virtio_ccw_scsi);
1747 #ifdef CONFIG_VHOST_SCSI
1748     type_register_static(&vhost_ccw_scsi);
1749 #endif
1750     type_register_static(&virtio_ccw_rng);
1751     type_register_static(&virtual_css_bridge_info);
1752 }
1753
1754 type_init(virtio_ccw_register)