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_PCI_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_PCI_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_PCI_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_PCI_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             virtio_set_status(vdev, status);
 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         }
 510         break;
 511     case CCW_CMD_SET_IND:
 512         if (check_len) {
 513             if (ccw.count != sizeof(indicators)) {
 514                 ret = -EINVAL;
 515                 break;
 516             }
 517         } else if (ccw.count < sizeof(indicators)) {
 518             /* Can't execute command. */
 519             ret = -EINVAL;
 520             break;
 521         }
 522         if (sch->thinint_active) {
 523             /* Trigger a command reject. */
 524             ret = -ENOSYS;
 525             break;
 526         }
 527         if (!ccw.cda) {
 528             ret = -EFAULT;
 529         } else {
 530             indicators = address_space_ldq_be(&address_space_memory, ccw.cda,
 531                                               MEMTXATTRS_UNSPECIFIED, NULL);
 532             dev->indicators = get_indicator(indicators, sizeof(uint64_t));
 533             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 534             ret = 0;
 535         }
 536         break;
 537     case CCW_CMD_SET_CONF_IND:
 538         if (check_len) {
 539             if (ccw.count != sizeof(indicators)) {
 540                 ret = -EINVAL;
 541                 break;
 542             }
 543         } else if (ccw.count < sizeof(indicators)) {
 544             /* Can't execute command. */
 545             ret = -EINVAL;
 546             break;
 547         }
 548         if (!ccw.cda) {
 549             ret = -EFAULT;
 550         } else {
 551             indicators = address_space_ldq_be(&address_space_memory, ccw.cda,
 552                                               MEMTXATTRS_UNSPECIFIED, NULL);
 553             dev->indicators2 = get_indicator(indicators, sizeof(uint64_t));
 554             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 555             ret = 0;
 556         }
 557         break;
 558     case CCW_CMD_READ_VQ_CONF:
 559         if (check_len) {
 560             if (ccw.count != sizeof(vq_config)) {
 561                 ret = -EINVAL;
 562                 break;
 563             }
 564         } else if (ccw.count < sizeof(vq_config)) {
 565             /* Can't execute command. */
 566             ret = -EINVAL;
 567             break;
 568         }
 569         if (!ccw.cda) {
 570             ret = -EFAULT;
 571         } else {
 572             vq_config.index = address_space_lduw_be(&address_space_memory,
 573                                                     ccw.cda,
 574                                                     MEMTXATTRS_UNSPECIFIED,
 575                                                     NULL);
 576             if (vq_config.index >= VIRTIO_PCI_QUEUE_MAX) {
 577                 ret = -EINVAL;
 578                 break;
 579             }
 580             vq_config.num_max = virtio_queue_get_num(vdev,
 581                                                      vq_config.index);
 582             address_space_stw_be(&address_space_memory,
 583                                  ccw.cda + sizeof(vq_config.index),
 584                                  vq_config.num_max,
 585                                  MEMTXATTRS_UNSPECIFIED,
 586                                  NULL);
 587             sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
 588             ret = 0;
 589         }
 590         break;
 591     case CCW_CMD_SET_IND_ADAPTER:
 592         if (check_len) {
 593             if (ccw.count != sizeof(*thinint)) {
 594                 ret = -EINVAL;
 595                 break;
 596             }
 597         } else if (ccw.count < sizeof(*thinint)) {
 598             /* Can't execute command. */
 599             ret = -EINVAL;
 600             break;
 601         }
 602         len = sizeof(*thinint);
 603         hw_len = len;
 604         if (!ccw.cda) {
 605             ret = -EFAULT;
 606         } else if (dev->indicators && !sch->thinint_active) {
 607             /* Trigger a command reject. */
 608             ret = -ENOSYS;
 609         } else {
 610             thinint = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 611             if (!thinint) {
 612                 ret = -EFAULT;
 613             } else {
 614                 uint64_t ind_bit = ldq_be_p(&thinint->ind_bit);
 615
 616                 len = hw_len;
 617                 dev->summary_indicator =
 618                     get_indicator(ldq_be_p(&thinint->summary_indicator),
 619                                   sizeof(uint8_t));
 620                 dev->indicators =
 621                     get_indicator(ldq_be_p(&thinint->device_indicator),
 622                                   ind_bit / 8 + 1);
 623                 dev->thinint_isc = thinint->isc;
 624                 dev->routes.adapter.ind_offset = ind_bit;
 625                 dev->routes.adapter.summary_offset = 7;
 626                 cpu_physical_memory_unmap(thinint, hw_len, 0, hw_len);
 627                 ret = css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
 628                                               dev->thinint_isc, true, false,
 629                                               &dev->routes.adapter.adapter_id);
 630                 assert(ret == 0);
 631                 sch->thinint_active = ((dev->indicators != NULL) &&
 632                                        (dev->summary_indicator != NULL));
 633                 sch->curr_status.scsw.count = ccw.count - len;
 634                 ret = 0;
 635             }
 636         }
 637         break;
 638     default:
 639         ret = -ENOSYS;
 640         break;
 641     }
 642     return ret;
 643 }
 644
 645 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
 646 {
 647     unsigned int cssid = 0;
 648     unsigned int ssid = 0;
 649     unsigned int schid;
 650     unsigned int devno;
 651     bool have_devno = false;
 652     bool found = false;
 653     SubchDev *sch;
 654     int num;
 655     Error *err = NULL;
 656     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
 657
 658     sch = g_malloc0(sizeof(SubchDev));
 659
 660     sch->driver_data = dev;
 661     dev->sch = sch;
 662
 663     dev->indicators = NULL;
 664
 665     /* Initialize subchannel structure. */
 666     sch->channel_prog = 0x0;
 667     sch->last_cmd_valid = false;
 668     sch->thinint_active = false;
 669     /*
 670      * Use a device number if provided. Otherwise, fall back to subchannel
 671      * number.
 672      */
 673     if (dev->bus_id) {
 674         num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno);
 675         if (num == 3) {
 676             if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
 677                 error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x",
 678                            cssid, ssid);
 679                 goto out_err;
 680             }
 681             /* Enforce use of virtual cssid. */
 682             if (cssid != VIRTUAL_CSSID) {
 683                 error_setg(errp, "cssid %x not valid for virtio devices",
 684                            cssid);
 685                 goto out_err;
 686             }
 687             if (css_devno_used(cssid, ssid, devno)) {
 688                 error_setg(errp, "Device %x.%x.%04x already exists",
 689                            cssid, ssid, devno);
 690                 goto out_err;
 691             }
 692             sch->cssid = cssid;
 693             sch->ssid = ssid;
 694             sch->devno = devno;
 695             have_devno = true;
 696         } else {
 697             error_setg(errp, "Malformed devno parameter '%s'", dev->bus_id);
 698             goto out_err;
 699         }
 700     }
 701
 702     /* Find the next free id. */
 703     if (have_devno) {
 704         for (schid = 0; schid <= MAX_SCHID; schid++) {
 705             if (!css_find_subch(1, cssid, ssid, schid)) {
 706                 sch->schid = schid;
 707                 css_subch_assign(cssid, ssid, schid, devno, sch);
 708                 found = true;
 709                 break;
 710             }
 711         }
 712         if (!found) {
 713             error_setg(errp, "No free subchannel found for %x.%x.%04x",
 714                        cssid, ssid, devno);
 715             goto out_err;
 716         }
 717         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 718                                     "user-configured");
 719     } else {
 720         cssid = VIRTUAL_CSSID;
 721         for (ssid = 0; ssid <= MAX_SSID; ssid++) {
 722             for (schid = 0; schid <= MAX_SCHID; schid++) {
 723                 if (!css_find_subch(1, cssid, ssid, schid)) {
 724                     sch->cssid = cssid;
 725                     sch->ssid = ssid;
 726                     sch->schid = schid;
 727                     devno = schid;
 728                     /*
 729                      * If the devno is already taken, look further in this
 730                      * subchannel set.
 731                      */
 732                     while (css_devno_used(cssid, ssid, devno)) {
 733                         if (devno == MAX_SCHID) {
 734                             devno = 0;
 735                         } else if (devno == schid - 1) {
 736                             error_setg(errp, "No free devno found");
 737                             goto out_err;
 738                         } else {
 739                             devno++;
 740                         }
 741                     }
 742                     sch->devno = devno;
 743                     css_subch_assign(cssid, ssid, schid, devno, sch);
 744                     found = true;
 745                     break;
 746                 }
 747             }
 748             if (found) {
 749                 break;
 750             }
 751         }
 752         if (!found) {
 753             error_setg(errp, "Virtual channel subsystem is full!");
 754             goto out_err;
 755         }
 756         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 757                                     "auto-configured");
 758     }
 759
 760     /* Build initial schib. */
 761     css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
 762
 763     sch->ccw_cb = virtio_ccw_cb;
 764
 765     /* Build senseid data. */
 766     memset(&sch->id, 0, sizeof(SenseId));
 767     sch->id.reserved = 0xff;
 768     sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
 769
 770     if (k->realize) {
 771         k->realize(dev, &err);
 772     }
 773     if (err) {
 774         error_propagate(errp, err);
 775         css_subch_assign(cssid, ssid, schid, devno, NULL);
 776         goto out_err;
 777     }
 778
 779     return;
 780
 781 out_err:
 782     dev->sch = NULL;
 783     g_free(sch);
 784 }
 785
 786 static int virtio_ccw_exit(VirtioCcwDevice *dev)
 787 {
 788     SubchDev *sch = dev->sch;
 789
 790     if (sch) {
 791         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 792         g_free(sch);
 793     }
 794     if (dev->indicators) {
 795         release_indicator(&dev->routes.adapter, dev->indicators);
 796         dev->indicators = NULL;
 797     }
 798     return 0;
 799 }
 800
 801 static void virtio_ccw_net_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 802 {
 803     DeviceState *qdev = DEVICE(ccw_dev);
 804     VirtIONetCcw *dev = VIRTIO_NET_CCW(ccw_dev);
 805     DeviceState *vdev = DEVICE(&dev->vdev);
 806     Error *err = NULL;
 807
 808     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
 809                                   object_get_typename(OBJECT(qdev)));
 810     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 811     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 812     if (err) {
 813         error_propagate(errp, err);
 814     }
 815 }
 816
 817 static void virtio_ccw_net_instance_init(Object *obj)
 818 {
 819     VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
 820
 821     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 822                                 TYPE_VIRTIO_NET);
 823     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 824                               "bootindex", &error_abort);
 825 }
 826
 827 static void virtio_ccw_blk_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 828 {
 829     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(ccw_dev);
 830     DeviceState *vdev = DEVICE(&dev->vdev);
 831     Error *err = NULL;
 832
 833     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 834     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 835     if (err) {
 836         error_propagate(errp, err);
 837     }
 838 }
 839
 840 static void virtio_ccw_blk_instance_init(Object *obj)
 841 {
 842     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(obj);
 843
 844     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 845                                 TYPE_VIRTIO_BLK);
 846     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
 847                               &error_abort);
 848     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 849                               "bootindex", &error_abort);
 850 }
 851
 852 static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 853 {
 854     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(ccw_dev);
 855     DeviceState *vdev = DEVICE(&dev->vdev);
 856     DeviceState *proxy = DEVICE(ccw_dev);
 857     Error *err = NULL;
 858     char *bus_name;
 859
 860     /*
 861      * For command line compatibility, this sets the virtio-serial-device bus
 862      * name as before.
 863      */
 864     if (proxy->id) {
 865         bus_name = g_strdup_printf("%s.0", proxy->id);
 866         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 867         g_free(bus_name);
 868     }
 869
 870     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 871     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 872     if (err) {
 873         error_propagate(errp, err);
 874     }
 875 }
 876
 877
 878 static void virtio_ccw_serial_instance_init(Object *obj)
 879 {
 880     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(obj);
 881
 882     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 883                                 TYPE_VIRTIO_SERIAL);
 884 }
 885
 886 static void virtio_ccw_balloon_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 887 {
 888     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(ccw_dev);
 889     DeviceState *vdev = DEVICE(&dev->vdev);
 890     Error *err = NULL;
 891
 892     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 893     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 894     if (err) {
 895         error_propagate(errp, err);
 896     }
 897 }
 898
 899 static void virtio_ccw_balloon_instance_init(Object *obj)
 900 {
 901     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(obj);
 902
 903     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 904                                 TYPE_VIRTIO_BALLOON);
 905     object_property_add_alias(obj, "guest-stats", OBJECT(&dev->vdev),
 906                               "guest-stats", &error_abort);
 907     object_property_add_alias(obj, "guest-stats-polling-interval",
 908                               OBJECT(&dev->vdev),
 909                               "guest-stats-polling-interval", &error_abort);
 910 }
 911
 912 static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 913 {
 914     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
 915     DeviceState *vdev = DEVICE(&dev->vdev);
 916     DeviceState *qdev = DEVICE(ccw_dev);
 917     Error *err = NULL;
 918     char *bus_name;
 919
 920     /*
 921      * For command line compatibility, this sets the virtio-scsi-device bus
 922      * name as before.
 923      */
 924     if (qdev->id) {
 925         bus_name = g_strdup_printf("%s.0", qdev->id);
 926         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 927         g_free(bus_name);
 928     }
 929
 930     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 931     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 932     if (err) {
 933         error_propagate(errp, err);
 934     }
 935 }
 936
 937 static void virtio_ccw_scsi_instance_init(Object *obj)
 938 {
 939     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(obj);
 940
 941     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 942                                 TYPE_VIRTIO_SCSI);
 943     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev), "iothread",
 944                               &error_abort);
 945 }
 946
 947 #ifdef CONFIG_VHOST_SCSI
 948 static void vhost_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 949 {
 950     VHostSCSICcw *dev = VHOST_SCSI_CCW(ccw_dev);
 951     DeviceState *vdev = DEVICE(&dev->vdev);
 952     Error *err = NULL;
 953
 954     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 955     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 956     if (err) {
 957         error_propagate(errp, err);
 958     }
 959 }
 960
 961 static void vhost_ccw_scsi_instance_init(Object *obj)
 962 {
 963     VHostSCSICcw *dev = VHOST_SCSI_CCW(obj);
 964
 965     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 966                                 TYPE_VHOST_SCSI);
 967 }
 968 #endif
 969
 970 static void virtio_ccw_rng_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 971 {
 972     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(ccw_dev);
 973     DeviceState *vdev = DEVICE(&dev->vdev);
 974     Error *err = NULL;
 975
 976     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 977     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
 978     if (err) {
 979         error_propagate(errp, err);
 980         return;
 981     }
 982
 983     object_property_set_link(OBJECT(dev),
 984                              OBJECT(dev->vdev.conf.rng), "rng",
 985                              NULL);
 986 }
 987
 988 /* DeviceState to VirtioCcwDevice. Note: used on datapath,
 989  * be careful and test performance if you change this.
 990  */
 991 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d)
 992 {
 993     return container_of(d, VirtioCcwDevice, parent_obj);
 994 }
 995
 996 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
 997                                      uint8_t to_be_set)
 998 {
 999     uint8_t ind_old, ind_new;
1000     hwaddr len = 1;
1001     uint8_t *ind_addr;
1002
1003     ind_addr = cpu_physical_memory_map(ind_loc, &len, 1);
1004     if (!ind_addr) {
1005         error_report("%s(%x.%x.%04x): unable to access indicator",
1006                      __func__, sch->cssid, sch->ssid, sch->schid);
1007         return -1;
1008     }
1009     do {
1010         ind_old = *ind_addr;
1011         ind_new = ind_old | to_be_set;
1012     } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
1013     cpu_physical_memory_unmap(ind_addr, len, 1, len);
1014
1015     return ind_old;
1016 }
1017
1018 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
1019 {
1020     VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
1021     SubchDev *sch = dev->sch;
1022     uint64_t indicators;
1023
1024     if (vector >= 128) {
1025         return;
1026     }
1027
1028     if (vector < VIRTIO_PCI_QUEUE_MAX) {
1029         if (!dev->indicators) {
1030             return;
1031         }
1032         if (sch->thinint_active) {
1033             /*
1034              * In the adapter interrupt case, indicators points to a
1035              * memory area that may be (way) larger than 64 bit and
1036              * ind_bit indicates the start of the indicators in a big
1037              * endian notation.
1038              */
1039             uint64_t ind_bit = dev->routes.adapter.ind_offset;
1040
1041             virtio_set_ind_atomic(sch, dev->indicators->addr +
1042                                   (ind_bit + vector) / 8,
1043                                   0x80 >> ((ind_bit + vector) % 8));
1044             if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr,
1045                                        0x01)) {
1046                 css_adapter_interrupt(dev->thinint_isc);
1047             }
1048         } else {
1049             indicators = address_space_ldq(&address_space_memory,
1050                                            dev->indicators->addr,
1051                                            MEMTXATTRS_UNSPECIFIED,
1052                                            NULL);
1053             indicators |= 1ULL << vector;
1054             address_space_stq(&address_space_memory, dev->indicators->addr,
1055                               indicators, MEMTXATTRS_UNSPECIFIED, NULL);
1056             css_conditional_io_interrupt(sch);
1057         }
1058     } else {
1059         if (!dev->indicators2) {
1060             return;
1061         }
1062         vector = 0;
1063         indicators = address_space_ldq(&address_space_memory,
1064                                        dev->indicators2->addr,
1065                                        MEMTXATTRS_UNSPECIFIED,
1066                                        NULL);
1067         indicators |= 1ULL << vector;
1068         address_space_stq(&address_space_memory, dev->indicators2->addr,
1069                           indicators, MEMTXATTRS_UNSPECIFIED, NULL);
1070         css_conditional_io_interrupt(sch);
1071     }
1072 }
1073
1074 static void virtio_ccw_reset(DeviceState *d)
1075 {
1076     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1077     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1078
1079     virtio_ccw_stop_ioeventfd(dev);
1080     virtio_reset(vdev);
1081     css_reset_sch(dev->sch);
1082     if (dev->indicators) {
1083         release_indicator(&dev->routes.adapter, dev->indicators);
1084         dev->indicators = NULL;
1085     }
1086     if (dev->indicators2) {
1087         release_indicator(&dev->routes.adapter, dev->indicators2);
1088         dev->indicators2 = NULL;
1089     }
1090     if (dev->summary_indicator) {
1091         release_indicator(&dev->routes.adapter, dev->summary_indicator);
1092         dev->summary_indicator = NULL;
1093     }
1094 }
1095
1096 static void virtio_ccw_vmstate_change(DeviceState *d, bool running)
1097 {
1098     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1099
1100     if (running) {
1101         virtio_ccw_start_ioeventfd(dev);
1102     } else {
1103         virtio_ccw_stop_ioeventfd(dev);
1104     }
1105 }
1106
1107 static bool virtio_ccw_query_guest_notifiers(DeviceState *d)
1108 {
1109     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1110
1111     return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA);
1112 }
1113
1114 static int virtio_ccw_set_host_notifier(DeviceState *d, int n, bool assign)
1115 {
1116     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1117
1118     /* Stop using the generic ioeventfd, we are doing eventfd handling
1119      * ourselves below */
1120     dev->ioeventfd_disabled = assign;
1121     if (assign) {
1122         virtio_ccw_stop_ioeventfd(dev);
1123     }
1124     return virtio_ccw_set_guest2host_notifier(dev, n, assign, false);
1125 }
1126
1127 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev)
1128 {
1129     int r;
1130
1131     if (!dev->sch->thinint_active) {
1132         return -EINVAL;
1133     }
1134
1135     r = map_indicator(&dev->routes.adapter, dev->summary_indicator);
1136     if (r) {
1137         return r;
1138     }
1139     r = map_indicator(&dev->routes.adapter, dev->indicators);
1140     if (r) {
1141         return r;
1142     }
1143     dev->routes.adapter.summary_addr = dev->summary_indicator->map;
1144     dev->routes.adapter.ind_addr = dev->indicators->map;
1145
1146     return 0;
1147 }
1148
1149 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs)
1150 {
1151     int i;
1152     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1153     int ret;
1154     S390FLICState *fs = s390_get_flic();
1155     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1156
1157     ret = virtio_ccw_get_mappings(dev);
1158     if (ret) {
1159         return ret;
1160     }
1161     for (i = 0; i < nvqs; i++) {
1162         if (!virtio_queue_get_num(vdev, i)) {
1163             break;
1164         }
1165     }
1166     dev->routes.num_routes = i;
1167     return fsc->add_adapter_routes(fs, &dev->routes);
1168 }
1169
1170 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs)
1171 {
1172     S390FLICState *fs = s390_get_flic();
1173     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1174
1175     fsc->release_adapter_routes(fs, &dev->routes);
1176 }
1177
1178 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n)
1179 {
1180     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1181     VirtQueue *vq = virtio_get_queue(vdev, n);
1182     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1183
1184     return kvm_irqchip_add_irqfd_notifier(kvm_state, notifier, NULL,
1185                                           dev->routes.gsi[n]);
1186 }
1187
1188 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n)
1189 {
1190     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1191     VirtQueue *vq = virtio_get_queue(vdev, n);
1192     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1193     int ret;
1194
1195     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, notifier,
1196                                             dev->routes.gsi[n]);
1197     assert(ret == 0);
1198 }
1199
1200 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
1201                                          bool assign, bool with_irqfd)
1202 {
1203     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1204     VirtQueue *vq = virtio_get_queue(vdev, n);
1205     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1206     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
1207
1208     if (assign) {
1209         int r = event_notifier_init(notifier, 0);
1210
1211         if (r < 0) {
1212             return r;
1213         }
1214         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
1215         if (with_irqfd) {
1216             r = virtio_ccw_add_irqfd(dev, n);
1217             if (r) {
1218                 virtio_queue_set_guest_notifier_fd_handler(vq, false,
1219                                                            with_irqfd);
1220                 return r;
1221             }
1222         }
1223         /*
1224          * We do not support individual masking for channel devices, so we
1225          * need to manually trigger any guest masking callbacks here.
1226          */
1227         if (k->guest_notifier_mask) {
1228             k->guest_notifier_mask(vdev, n, false);
1229         }
1230         /* get lost events and re-inject */
1231         if (k->guest_notifier_pending &&
1232             k->guest_notifier_pending(vdev, n)) {
1233             event_notifier_set(notifier);
1234         }
1235     } else {
1236         if (k->guest_notifier_mask) {
1237             k->guest_notifier_mask(vdev, n, true);
1238         }
1239         if (with_irqfd) {
1240             virtio_ccw_remove_irqfd(dev, n);
1241         }
1242         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
1243         event_notifier_cleanup(notifier);
1244     }
1245     return 0;
1246 }
1247
1248 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs,
1249                                           bool assigned)
1250 {
1251     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1252     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1253     bool with_irqfd = dev->sch->thinint_active && kvm_irqfds_enabled();
1254     int r, n;
1255
1256     if (with_irqfd && assigned) {
1257         /* irq routes need to be set up before assigning irqfds */
1258         r = virtio_ccw_setup_irqroutes(dev, nvqs);
1259         if (r < 0) {
1260             goto irqroute_error;
1261         }
1262     }
1263     for (n = 0; n < nvqs; n++) {
1264         if (!virtio_queue_get_num(vdev, n)) {
1265             break;
1266         }
1267         r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd);
1268         if (r < 0) {
1269             goto assign_error;
1270         }
1271     }
1272     if (with_irqfd && !assigned) {
1273         /* release irq routes after irqfds have been released */
1274         virtio_ccw_release_irqroutes(dev, nvqs);
1275     }
1276     return 0;
1277
1278 assign_error:
1279     while (--n >= 0) {
1280         virtio_ccw_set_guest_notifier(dev, n, !assigned, false);
1281     }
1282 irqroute_error:
1283     if (with_irqfd && assigned) {
1284         virtio_ccw_release_irqroutes(dev, nvqs);
1285     }
1286     return r;
1287 }
1288
1289 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f)
1290 {
1291     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1292     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1293
1294     qemu_put_be16(f, virtio_queue_vector(vdev, n));
1295 }
1296
1297 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f)
1298 {
1299     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1300     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1301     uint16_t vector;
1302
1303     qemu_get_be16s(f, &vector);
1304     virtio_queue_set_vector(vdev, n , vector);
1305
1306     return 0;
1307 }
1308
1309 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
1310 {
1311     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1312     SubchDev *s = dev->sch;
1313
1314     subch_device_save(s, f);
1315     if (dev->indicators != NULL) {
1316         qemu_put_be32(f, dev->indicators->len);
1317         qemu_put_be64(f, dev->indicators->addr);
1318     } else {
1319         qemu_put_be32(f, 0);
1320         qemu_put_be64(f, 0UL);
1321     }
1322     if (dev->indicators2 != NULL) {
1323         qemu_put_be32(f, dev->indicators2->len);
1324         qemu_put_be64(f, dev->indicators2->addr);
1325     } else {
1326         qemu_put_be32(f, 0);
1327         qemu_put_be64(f, 0UL);
1328     }
1329     if (dev->summary_indicator != NULL) {
1330         qemu_put_be32(f, dev->summary_indicator->len);
1331         qemu_put_be64(f, dev->summary_indicator->addr);
1332     } else {
1333         qemu_put_be32(f, 0);
1334         qemu_put_be64(f, 0UL);
1335     }
1336     qemu_put_be64(f, dev->routes.adapter.ind_offset);
1337     qemu_put_byte(f, dev->thinint_isc);
1338 }
1339
1340 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
1341 {
1342     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1343     SubchDev *s = dev->sch;
1344     int len;
1345
1346     s->driver_data = dev;
1347     subch_device_load(s, f);
1348     len = qemu_get_be32(f);
1349     if (len != 0) {
1350         dev->indicators = get_indicator(qemu_get_be64(f), len);
1351     } else {
1352         qemu_get_be64(f);
1353         dev->indicators = NULL;
1354     }
1355     len = qemu_get_be32(f);
1356     if (len != 0) {
1357         dev->indicators2 = get_indicator(qemu_get_be64(f), len);
1358     } else {
1359         qemu_get_be64(f);
1360         dev->indicators2 = NULL;
1361     }
1362     len = qemu_get_be32(f);
1363     if (len != 0) {
1364         dev->summary_indicator = get_indicator(qemu_get_be64(f), len);
1365     } else {
1366         qemu_get_be64(f);
1367         dev->summary_indicator = NULL;
1368     }
1369     dev->routes.adapter.ind_offset = qemu_get_be64(f);
1370     dev->thinint_isc = qemu_get_byte(f);
1371     if (s->thinint_active) {
1372         return css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
1373                                        dev->thinint_isc, true, false,
1374                                        &dev->routes.adapter.adapter_id);
1375     }
1376
1377     return 0;
1378 }
1379
1380 /* This is called by virtio-bus just after the device is plugged. */
1381 static void virtio_ccw_device_plugged(DeviceState *d)
1382 {
1383     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1384     SubchDev *sch = dev->sch;
1385     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
1386
1387     sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
1388
1389     virtio_add_feature(&vdev->host_features, VIRTIO_F_NOTIFY_ON_EMPTY);
1390     virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);
1391
1392     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
1393                           d->hotplugged, 1);
1394 }
1395
1396 static void virtio_ccw_device_unplugged(DeviceState *d)
1397 {
1398     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1399
1400     virtio_ccw_stop_ioeventfd(dev);
1401 }
1402 /**************** Virtio-ccw Bus Device Descriptions *******************/
1403
1404 static Property virtio_ccw_net_properties[] = {
1405     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1406     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1407                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1408     DEFINE_PROP_END_OF_LIST(),
1409 };
1410
1411 static void virtio_ccw_net_class_init(ObjectClass *klass, void *data)
1412 {
1413     DeviceClass *dc = DEVICE_CLASS(klass);
1414     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1415
1416     k->realize = virtio_ccw_net_realize;
1417     k->exit = virtio_ccw_exit;
1418     dc->reset = virtio_ccw_reset;
1419     dc->props = virtio_ccw_net_properties;
1420     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1421 }
1422
1423 static const TypeInfo virtio_ccw_net = {
1424     .name          = TYPE_VIRTIO_NET_CCW,
1425     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1426     .instance_size = sizeof(VirtIONetCcw),
1427     .instance_init = virtio_ccw_net_instance_init,
1428     .class_init    = virtio_ccw_net_class_init,
1429 };
1430
1431 static Property virtio_ccw_blk_properties[] = {
1432     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1433     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1434                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1435     DEFINE_PROP_END_OF_LIST(),
1436 };
1437
1438 static void virtio_ccw_blk_class_init(ObjectClass *klass, void *data)
1439 {
1440     DeviceClass *dc = DEVICE_CLASS(klass);
1441     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1442
1443     k->realize = virtio_ccw_blk_realize;
1444     k->exit = virtio_ccw_exit;
1445     dc->reset = virtio_ccw_reset;
1446     dc->props = virtio_ccw_blk_properties;
1447     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1448 }
1449
1450 static const TypeInfo virtio_ccw_blk = {
1451     .name          = TYPE_VIRTIO_BLK_CCW,
1452     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1453     .instance_size = sizeof(VirtIOBlkCcw),
1454     .instance_init = virtio_ccw_blk_instance_init,
1455     .class_init    = virtio_ccw_blk_class_init,
1456 };
1457
1458 static Property virtio_ccw_serial_properties[] = {
1459     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1460     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1461                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1462     DEFINE_PROP_END_OF_LIST(),
1463 };
1464
1465 static void virtio_ccw_serial_class_init(ObjectClass *klass, void *data)
1466 {
1467     DeviceClass *dc = DEVICE_CLASS(klass);
1468     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1469
1470     k->realize = virtio_ccw_serial_realize;
1471     k->exit = virtio_ccw_exit;
1472     dc->reset = virtio_ccw_reset;
1473     dc->props = virtio_ccw_serial_properties;
1474     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
1475 }
1476
1477 static const TypeInfo virtio_ccw_serial = {
1478     .name          = TYPE_VIRTIO_SERIAL_CCW,
1479     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1480     .instance_size = sizeof(VirtioSerialCcw),
1481     .instance_init = virtio_ccw_serial_instance_init,
1482     .class_init    = virtio_ccw_serial_class_init,
1483 };
1484
1485 static Property virtio_ccw_balloon_properties[] = {
1486     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1487     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1488                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1489     DEFINE_PROP_END_OF_LIST(),
1490 };
1491
1492 static void virtio_ccw_balloon_class_init(ObjectClass *klass, void *data)
1493 {
1494     DeviceClass *dc = DEVICE_CLASS(klass);
1495     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1496
1497     k->realize = virtio_ccw_balloon_realize;
1498     k->exit = virtio_ccw_exit;
1499     dc->reset = virtio_ccw_reset;
1500     dc->props = virtio_ccw_balloon_properties;
1501     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1502 }
1503
1504 static const TypeInfo virtio_ccw_balloon = {
1505     .name          = TYPE_VIRTIO_BALLOON_CCW,
1506     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1507     .instance_size = sizeof(VirtIOBalloonCcw),
1508     .instance_init = virtio_ccw_balloon_instance_init,
1509     .class_init    = virtio_ccw_balloon_class_init,
1510 };
1511
1512 static Property virtio_ccw_scsi_properties[] = {
1513     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1514     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1515                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1516     DEFINE_PROP_END_OF_LIST(),
1517 };
1518
1519 static void virtio_ccw_scsi_class_init(ObjectClass *klass, void *data)
1520 {
1521     DeviceClass *dc = DEVICE_CLASS(klass);
1522     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1523
1524     k->realize = virtio_ccw_scsi_realize;
1525     k->exit = virtio_ccw_exit;
1526     dc->reset = virtio_ccw_reset;
1527     dc->props = virtio_ccw_scsi_properties;
1528     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1529 }
1530
1531 static const TypeInfo virtio_ccw_scsi = {
1532     .name          = TYPE_VIRTIO_SCSI_CCW,
1533     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1534     .instance_size = sizeof(VirtIOSCSICcw),
1535     .instance_init = virtio_ccw_scsi_instance_init,
1536     .class_init    = virtio_ccw_scsi_class_init,
1537 };
1538
1539 #ifdef CONFIG_VHOST_SCSI
1540 static Property vhost_ccw_scsi_properties[] = {
1541     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1542     DEFINE_PROP_END_OF_LIST(),
1543 };
1544
1545 static void vhost_ccw_scsi_class_init(ObjectClass *klass, void *data)
1546 {
1547     DeviceClass *dc = DEVICE_CLASS(klass);
1548     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1549
1550     k->realize = vhost_ccw_scsi_realize;
1551     k->exit = virtio_ccw_exit;
1552     dc->reset = virtio_ccw_reset;
1553     dc->props = vhost_ccw_scsi_properties;
1554     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1555 }
1556
1557 static const TypeInfo vhost_ccw_scsi = {
1558     .name          = TYPE_VHOST_SCSI_CCW,
1559     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1560     .instance_size = sizeof(VHostSCSICcw),
1561     .instance_init = vhost_ccw_scsi_instance_init,
1562     .class_init    = vhost_ccw_scsi_class_init,
1563 };
1564 #endif
1565
1566 static void virtio_ccw_rng_instance_init(Object *obj)
1567 {
1568     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(obj);
1569
1570     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1571                                 TYPE_VIRTIO_RNG);
1572     object_property_add_alias(obj, "rng", OBJECT(&dev->vdev),
1573                               "rng", &error_abort);
1574 }
1575
1576 static Property virtio_ccw_rng_properties[] = {
1577     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1578     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1579                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1580     DEFINE_PROP_END_OF_LIST(),
1581 };
1582
1583 static void virtio_ccw_rng_class_init(ObjectClass *klass, void *data)
1584 {
1585     DeviceClass *dc = DEVICE_CLASS(klass);
1586     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1587
1588     k->realize = virtio_ccw_rng_realize;
1589     k->exit = virtio_ccw_exit;
1590     dc->reset = virtio_ccw_reset;
1591     dc->props = virtio_ccw_rng_properties;
1592     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1593 }
1594
1595 static const TypeInfo virtio_ccw_rng = {
1596     .name          = TYPE_VIRTIO_RNG_CCW,
1597     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1598     .instance_size = sizeof(VirtIORNGCcw),
1599     .instance_init = virtio_ccw_rng_instance_init,
1600     .class_init    = virtio_ccw_rng_class_init,
1601 };
1602
1603 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp)
1604 {
1605     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1606
1607     virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
1608     virtio_ccw_device_realize(_dev, errp);
1609 }
1610
1611 static int virtio_ccw_busdev_exit(DeviceState *dev)
1612 {
1613     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1614     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1615
1616     return _info->exit(_dev);
1617 }
1618
1619 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev,
1620                                      DeviceState *dev, Error **errp)
1621 {
1622     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1623     SubchDev *sch = _dev->sch;
1624
1625     virtio_ccw_stop_ioeventfd(_dev);
1626
1627     /*
1628      * We should arrive here only for device_del, since we don't support
1629      * direct hot(un)plug of channels, but only through virtio.
1630      */
1631     assert(sch != NULL);
1632     /* Subchannel is now disabled and no longer valid. */
1633     sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA |
1634                                      PMCW_FLAGS_MASK_DNV);
1635
1636     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
1637
1638     object_unparent(OBJECT(dev));
1639 }
1640
1641 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
1642 {
1643     DeviceClass *dc = DEVICE_CLASS(klass);
1644
1645     dc->realize = virtio_ccw_busdev_realize;
1646     dc->exit = virtio_ccw_busdev_exit;
1647     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
1648 }
1649
1650 static const TypeInfo virtio_ccw_device_info = {
1651     .name = TYPE_VIRTIO_CCW_DEVICE,
1652     .parent = TYPE_DEVICE,
1653     .instance_size = sizeof(VirtioCcwDevice),
1654     .class_init = virtio_ccw_device_class_init,
1655     .class_size = sizeof(VirtIOCCWDeviceClass),
1656     .abstract = true,
1657 };
1658
1659 /***************** Virtual-css Bus Bridge Device ********************/
1660 /* Only required to have the virtio bus as child in the system bus */
1661
1662 static int virtual_css_bridge_init(SysBusDevice *dev)
1663 {
1664     /* nothing */
1665     return 0;
1666 }
1667
1668 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
1669 {
1670     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
1671     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1672     DeviceClass *dc = DEVICE_CLASS(klass);
1673
1674     k->init = virtual_css_bridge_init;
1675     hc->unplug = virtio_ccw_busdev_unplug;
1676     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
1677 }
1678
1679 static const TypeInfo virtual_css_bridge_info = {
1680     .name          = "virtual-css-bridge",
1681     .parent        = TYPE_SYS_BUS_DEVICE,
1682     .instance_size = sizeof(SysBusDevice),
1683     .class_init    = virtual_css_bridge_class_init,
1684     .interfaces = (InterfaceInfo[]) {
1685         { TYPE_HOTPLUG_HANDLER },
1686         { }
1687     }
1688 };
1689
1690 /* virtio-ccw-bus */
1691
1692 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
1693                                VirtioCcwDevice *dev)
1694 {
1695     DeviceState *qdev = DEVICE(dev);
1696     char virtio_bus_name[] = "virtio-bus";
1697
1698     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS,
1699                         qdev, virtio_bus_name);
1700 }
1701
1702 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
1703 {
1704     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1705     BusClass *bus_class = BUS_CLASS(klass);
1706
1707     bus_class->max_dev = 1;
1708     k->notify = virtio_ccw_notify;
1709     k->vmstate_change = virtio_ccw_vmstate_change;
1710     k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
1711     k->set_host_notifier = virtio_ccw_set_host_notifier;
1712     k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
1713     k->save_queue = virtio_ccw_save_queue;
1714     k->load_queue = virtio_ccw_load_queue;
1715     k->save_config = virtio_ccw_save_config;
1716     k->load_config = virtio_ccw_load_config;
1717     k->device_plugged = virtio_ccw_device_plugged;
1718     k->device_unplugged = virtio_ccw_device_unplugged;
1719 }
1720
1721 static const TypeInfo virtio_ccw_bus_info = {
1722     .name = TYPE_VIRTIO_CCW_BUS,
1723     .parent = TYPE_VIRTIO_BUS,
1724     .instance_size = sizeof(VirtioCcwBusState),
1725     .class_init = virtio_ccw_bus_class_init,
1726 };
1727
1728 static void virtio_ccw_register(void)
1729 {
1730     type_register_static(&virtio_ccw_bus_info);
1731     type_register_static(&virtual_css_bus_info);
1732     type_register_static(&virtio_ccw_device_info);
1733     type_register_static(&virtio_ccw_serial);
1734     type_register_static(&virtio_ccw_blk);
1735     type_register_static(&virtio_ccw_net);
1736     type_register_static(&virtio_ccw_balloon);
1737     type_register_static(&virtio_ccw_scsi);
1738 #ifdef CONFIG_VHOST_SCSI
1739     type_register_static(&vhost_ccw_scsi);
1740 #endif
1741     type_register_static(&virtio_ccw_rng);
1742     type_register_static(&virtual_css_bridge_info);
1743 }
1744
1745 type_init(virtio_ccw_register)