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, 0);
 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 = ldq_phys(&address_space_memory, ccw.cda);
 339             info.align = ldl_phys(&address_space_memory,
 340                                   ccw.cda + sizeof(info.queue));
 341             info.index = lduw_phys(&address_space_memory,
 342                                    ccw.cda + sizeof(info.queue)
 343                                    + sizeof(info.align));
 344             info.num = lduw_phys(&address_space_memory,
 345                                  ccw.cda + sizeof(info.queue)
 346                                  + sizeof(info.align)
 347                                  + sizeof(info.index));
 348             ret = virtio_ccw_set_vqs(sch, info.queue, info.align, info.index,
 349                                      info.num);
 350             sch->curr_status.scsw.count = 0;
 351         }
 352         break;
 353     case CCW_CMD_VDEV_RESET:
 354         virtio_ccw_stop_ioeventfd(dev);
 355         virtio_reset(vdev);
 356         ret = 0;
 357         break;
 358     case CCW_CMD_READ_FEAT:
 359         if (check_len) {
 360             if (ccw.count != sizeof(features)) {
 361                 ret = -EINVAL;
 362                 break;
 363             }
 364         } else if (ccw.count < sizeof(features)) {
 365             /* Can't execute command. */
 366             ret = -EINVAL;
 367             break;
 368         }
 369         if (!ccw.cda) {
 370             ret = -EFAULT;
 371         } else {
 372             features.index = ldub_phys(&address_space_memory,
 373                                        ccw.cda + sizeof(features.features));
 374             if (features.index < ARRAY_SIZE(dev->host_features)) {
 375                 features.features = dev->host_features[features.index];
 376             } else {
 377                 /* Return zeroes if the guest supports more feature bits. */
 378                 features.features = 0;
 379             }
 380             stl_le_phys(&address_space_memory, ccw.cda, features.features);
 381             sch->curr_status.scsw.count = ccw.count - sizeof(features);
 382             ret = 0;
 383         }
 384         break;
 385     case CCW_CMD_WRITE_FEAT:
 386         if (check_len) {
 387             if (ccw.count != sizeof(features)) {
 388                 ret = -EINVAL;
 389                 break;
 390             }
 391         } else if (ccw.count < sizeof(features)) {
 392             /* Can't execute command. */
 393             ret = -EINVAL;
 394             break;
 395         }
 396         if (!ccw.cda) {
 397             ret = -EFAULT;
 398         } else {
 399             features.index = ldub_phys(&address_space_memory,
 400                                        ccw.cda + sizeof(features.features));
 401             features.features = ldl_le_phys(&address_space_memory, ccw.cda);
 402             if (features.index < ARRAY_SIZE(dev->host_features)) {
 403                 virtio_set_features(vdev, features.features);
 404             } else {
 405                 /*
 406                  * If the guest supports more feature bits, assert that it
 407                  * passes us zeroes for those we don't support.
 408                  */
 409                 if (features.features) {
 410                     fprintf(stderr, "Guest bug: features[%i]=%x (expected 0)\n",
 411                             features.index, features.features);
 412                     /* XXX: do a unit check here? */
 413                 }
 414             }
 415             sch->curr_status.scsw.count = ccw.count - sizeof(features);
 416             ret = 0;
 417         }
 418         break;
 419     case CCW_CMD_READ_CONF:
 420         if (check_len) {
 421             if (ccw.count > vdev->config_len) {
 422                 ret = -EINVAL;
 423                 break;
 424             }
 425         }
 426         len = MIN(ccw.count, vdev->config_len);
 427         if (!ccw.cda) {
 428             ret = -EFAULT;
 429         } else {
 430             virtio_bus_get_vdev_config(&dev->bus, vdev->config);
 431             /* XXX config space endianness */
 432             cpu_physical_memory_write(ccw.cda, vdev->config, len);
 433             sch->curr_status.scsw.count = ccw.count - len;
 434             ret = 0;
 435         }
 436         break;
 437     case CCW_CMD_WRITE_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         hw_len = len;
 446         if (!ccw.cda) {
 447             ret = -EFAULT;
 448         } else {
 449             config = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 450             if (!config) {
 451                 ret = -EFAULT;
 452             } else {
 453                 len = hw_len;
 454                 /* XXX config space endianness */
 455                 memcpy(vdev->config, config, len);
 456                 cpu_physical_memory_unmap(config, hw_len, 0, hw_len);
 457                 virtio_bus_set_vdev_config(&dev->bus, vdev->config);
 458                 sch->curr_status.scsw.count = ccw.count - len;
 459                 ret = 0;
 460             }
 461         }
 462         break;
 463     case CCW_CMD_WRITE_STATUS:
 464         if (check_len) {
 465             if (ccw.count != sizeof(status)) {
 466                 ret = -EINVAL;
 467                 break;
 468             }
 469         } else if (ccw.count < sizeof(status)) {
 470             /* Can't execute command. */
 471             ret = -EINVAL;
 472             break;
 473         }
 474         if (!ccw.cda) {
 475             ret = -EFAULT;
 476         } else {
 477             status = ldub_phys(&address_space_memory, ccw.cda);
 478             if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 479                 virtio_ccw_stop_ioeventfd(dev);
 480             }
 481             virtio_set_status(vdev, status);
 482             if (vdev->status == 0) {
 483                 virtio_reset(vdev);
 484             }
 485             if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
 486                 virtio_ccw_start_ioeventfd(dev);
 487             }
 488             sch->curr_status.scsw.count = ccw.count - sizeof(status);
 489             ret = 0;
 490         }
 491         break;
 492     case CCW_CMD_SET_IND:
 493         if (check_len) {
 494             if (ccw.count != sizeof(indicators)) {
 495                 ret = -EINVAL;
 496                 break;
 497             }
 498         } else if (ccw.count < sizeof(indicators)) {
 499             /* Can't execute command. */
 500             ret = -EINVAL;
 501             break;
 502         }
 503         if (sch->thinint_active) {
 504             /* Trigger a command reject. */
 505             ret = -ENOSYS;
 506             break;
 507         }
 508         if (!ccw.cda) {
 509             ret = -EFAULT;
 510         } else {
 511             indicators = ldq_phys(&address_space_memory, ccw.cda);
 512             dev->indicators = get_indicator(indicators, sizeof(uint64_t));
 513             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 514             ret = 0;
 515         }
 516         break;
 517     case CCW_CMD_SET_CONF_IND:
 518         if (check_len) {
 519             if (ccw.count != sizeof(indicators)) {
 520                 ret = -EINVAL;
 521                 break;
 522             }
 523         } else if (ccw.count < sizeof(indicators)) {
 524             /* Can't execute command. */
 525             ret = -EINVAL;
 526             break;
 527         }
 528         if (!ccw.cda) {
 529             ret = -EFAULT;
 530         } else {
 531             indicators = ldq_phys(&address_space_memory, ccw.cda);
 532             dev->indicators2 = 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_READ_VQ_CONF:
 538         if (check_len) {
 539             if (ccw.count != sizeof(vq_config)) {
 540                 ret = -EINVAL;
 541                 break;
 542             }
 543         } else if (ccw.count < sizeof(vq_config)) {
 544             /* Can't execute command. */
 545             ret = -EINVAL;
 546             break;
 547         }
 548         if (!ccw.cda) {
 549             ret = -EFAULT;
 550         } else {
 551             vq_config.index = lduw_phys(&address_space_memory, ccw.cda);
 552             vq_config.num_max = virtio_queue_get_num(vdev,
 553                                                      vq_config.index);
 554             stw_phys(&address_space_memory,
 555                      ccw.cda + sizeof(vq_config.index), vq_config.num_max);
 556             sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
 557             ret = 0;
 558         }
 559         break;
 560     case CCW_CMD_SET_IND_ADAPTER:
 561         if (check_len) {
 562             if (ccw.count != sizeof(*thinint)) {
 563                 ret = -EINVAL;
 564                 break;
 565             }
 566         } else if (ccw.count < sizeof(*thinint)) {
 567             /* Can't execute command. */
 568             ret = -EINVAL;
 569             break;
 570         }
 571         len = sizeof(*thinint);
 572         hw_len = len;
 573         if (!ccw.cda) {
 574             ret = -EFAULT;
 575         } else if (dev->indicators && !sch->thinint_active) {
 576             /* Trigger a command reject. */
 577             ret = -ENOSYS;
 578         } else {
 579             thinint = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 580             if (!thinint) {
 581                 ret = -EFAULT;
 582             } else {
 583                 len = hw_len;
 584                 dev->summary_indicator =
 585                     get_indicator(thinint->summary_indicator, sizeof(uint8_t));
 586                 dev->indicators = get_indicator(thinint->device_indicator,
 587                                                 thinint->ind_bit / 8 + 1);
 588                 dev->thinint_isc = thinint->isc;
 589                 dev->routes.adapter.ind_offset = thinint->ind_bit;
 590                 dev->routes.adapter.summary_offset = 7;
 591                 cpu_physical_memory_unmap(thinint, hw_len, 0, hw_len);
 592                 ret = css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
 593                                               dev->thinint_isc, true, false,
 594                                               &dev->routes.adapter.adapter_id);
 595                 assert(ret == 0);
 596                 sch->thinint_active = ((dev->indicators != NULL) &&
 597                                        (dev->summary_indicator != NULL));
 598                 sch->curr_status.scsw.count = ccw.count - len;
 599                 ret = 0;
 600             }
 601         }
 602         break;
 603     default:
 604         ret = -ENOSYS;
 605         break;
 606     }
 607     return ret;
 608 }
 609
 610 static int virtio_ccw_device_init(VirtioCcwDevice *dev, VirtIODevice *vdev)
 611 {
 612     unsigned int cssid = 0;
 613     unsigned int ssid = 0;
 614     unsigned int schid;
 615     unsigned int devno;
 616     bool have_devno = false;
 617     bool found = false;
 618     SubchDev *sch;
 619     int ret;
 620     int num;
 621     DeviceState *parent = DEVICE(dev);
 622
 623     sch = g_malloc0(sizeof(SubchDev));
 624
 625     sch->driver_data = dev;
 626     dev->sch = sch;
 627
 628     dev->indicators = NULL;
 629
 630     /* Initialize subchannel structure. */
 631     sch->channel_prog = 0x0;
 632     sch->last_cmd_valid = false;
 633     sch->thinint_active = false;
 634     /*
 635      * Use a device number if provided. Otherwise, fall back to subchannel
 636      * number.
 637      */
 638     if (dev->bus_id) {
 639         num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno);
 640         if (num == 3) {
 641             if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
 642                 ret = -EINVAL;
 643                 error_report("Invalid cssid or ssid: cssid %x, ssid %x",
 644                              cssid, ssid);
 645                 goto out_err;
 646             }
 647             /* Enforce use of virtual cssid. */
 648             if (cssid != VIRTUAL_CSSID) {
 649                 ret = -EINVAL;
 650                 error_report("cssid %x not valid for virtio devices", cssid);
 651                 goto out_err;
 652             }
 653             if (css_devno_used(cssid, ssid, devno)) {
 654                 ret = -EEXIST;
 655                 error_report("Device %x.%x.%04x already exists", cssid, ssid,
 656                              devno);
 657                 goto out_err;
 658             }
 659             sch->cssid = cssid;
 660             sch->ssid = ssid;
 661             sch->devno = devno;
 662             have_devno = true;
 663         } else {
 664             ret = -EINVAL;
 665             error_report("Malformed devno parameter '%s'", dev->bus_id);
 666             goto out_err;
 667         }
 668     }
 669
 670     /* Find the next free id. */
 671     if (have_devno) {
 672         for (schid = 0; schid <= MAX_SCHID; schid++) {
 673             if (!css_find_subch(1, cssid, ssid, schid)) {
 674                 sch->schid = schid;
 675                 css_subch_assign(cssid, ssid, schid, devno, sch);
 676                 found = true;
 677                 break;
 678             }
 679         }
 680         if (!found) {
 681             ret = -ENODEV;
 682             error_report("No free subchannel found for %x.%x.%04x", cssid, ssid,
 683                          devno);
 684             goto out_err;
 685         }
 686         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 687                                     "user-configured");
 688     } else {
 689         cssid = VIRTUAL_CSSID;
 690         for (ssid = 0; ssid <= MAX_SSID; ssid++) {
 691             for (schid = 0; schid <= MAX_SCHID; schid++) {
 692                 if (!css_find_subch(1, cssid, ssid, schid)) {
 693                     sch->cssid = cssid;
 694                     sch->ssid = ssid;
 695                     sch->schid = schid;
 696                     devno = schid;
 697                     /*
 698                      * If the devno is already taken, look further in this
 699                      * subchannel set.
 700                      */
 701                     while (css_devno_used(cssid, ssid, devno)) {
 702                         if (devno == MAX_SCHID) {
 703                             devno = 0;
 704                         } else if (devno == schid - 1) {
 705                             ret = -ENODEV;
 706                             error_report("No free devno found");
 707                             goto out_err;
 708                         } else {
 709                             devno++;
 710                         }
 711                     }
 712                     sch->devno = devno;
 713                     css_subch_assign(cssid, ssid, schid, devno, sch);
 714                     found = true;
 715                     break;
 716                 }
 717             }
 718             if (found) {
 719                 break;
 720             }
 721         }
 722         if (!found) {
 723             ret = -ENODEV;
 724             error_report("Virtual channel subsystem is full!");
 725             goto out_err;
 726         }
 727         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 728                                     "auto-configured");
 729     }
 730
 731     /* Build initial schib. */
 732     css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
 733
 734     sch->ccw_cb = virtio_ccw_cb;
 735
 736     /* Build senseid data. */
 737     memset(&sch->id, 0, sizeof(SenseId));
 738     sch->id.reserved = 0xff;
 739     sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
 740     sch->id.cu_model = vdev->device_id;
 741
 742     /* Only the first 32 feature bits are used. */
 743     dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
 744                                                          dev->host_features[0]);
 745
 746     virtio_add_feature(&dev->host_features[0], VIRTIO_F_NOTIFY_ON_EMPTY);
 747     virtio_add_feature(&dev->host_features[0], VIRTIO_F_BAD_FEATURE);
 748
 749     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 750                           parent->hotplugged, 1);
 751     return 0;
 752
 753 out_err:
 754     dev->sch = NULL;
 755     g_free(sch);
 756     return ret;
 757 }
 758
 759 static int virtio_ccw_exit(VirtioCcwDevice *dev)
 760 {
 761     SubchDev *sch = dev->sch;
 762
 763     if (sch) {
 764         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 765         g_free(sch);
 766     }
 767     if (dev->indicators) {
 768         release_indicator(&dev->routes.adapter, dev->indicators);
 769         dev->indicators = NULL;
 770     }
 771     return 0;
 772 }
 773
 774 static int virtio_ccw_net_init(VirtioCcwDevice *ccw_dev)
 775 {
 776     DeviceState *qdev = DEVICE(ccw_dev);
 777     VirtIONetCcw *dev = VIRTIO_NET_CCW(ccw_dev);
 778     DeviceState *vdev = DEVICE(&dev->vdev);
 779
 780     virtio_net_set_config_size(&dev->vdev, ccw_dev->host_features[0]);
 781     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
 782                                   object_get_typename(OBJECT(qdev)));
 783     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 784     if (qdev_init(vdev) < 0) {
 785         return -1;
 786     }
 787
 788     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 789 }
 790
 791 static void virtio_ccw_net_instance_init(Object *obj)
 792 {
 793     VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
 794
 795     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 796                                 TYPE_VIRTIO_NET);
 797     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 798                               "bootindex", &error_abort);
 799 }
 800
 801 static int virtio_ccw_blk_init(VirtioCcwDevice *ccw_dev)
 802 {
 803     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(ccw_dev);
 804     DeviceState *vdev = DEVICE(&dev->vdev);
 805     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 806     if (qdev_init(vdev) < 0) {
 807         return -1;
 808     }
 809
 810     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 811 }
 812
 813 static void virtio_ccw_blk_instance_init(Object *obj)
 814 {
 815     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(obj);
 816
 817     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 818                                 TYPE_VIRTIO_BLK);
 819     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
 820                               &error_abort);
 821     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 822                               "bootindex", &error_abort);
 823 }
 824
 825 static int virtio_ccw_serial_init(VirtioCcwDevice *ccw_dev)
 826 {
 827     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(ccw_dev);
 828     DeviceState *vdev = DEVICE(&dev->vdev);
 829     DeviceState *proxy = DEVICE(ccw_dev);
 830     char *bus_name;
 831
 832     /*
 833      * For command line compatibility, this sets the virtio-serial-device bus
 834      * name as before.
 835      */
 836     if (proxy->id) {
 837         bus_name = g_strdup_printf("%s.0", proxy->id);
 838         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 839         g_free(bus_name);
 840     }
 841
 842     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 843     if (qdev_init(vdev) < 0) {
 844         return -1;
 845     }
 846
 847     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 848 }
 849
 850
 851 static void virtio_ccw_serial_instance_init(Object *obj)
 852 {
 853     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(obj);
 854
 855     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 856                                 TYPE_VIRTIO_SERIAL);
 857 }
 858
 859 static int virtio_ccw_balloon_init(VirtioCcwDevice *ccw_dev)
 860 {
 861     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(ccw_dev);
 862     DeviceState *vdev = DEVICE(&dev->vdev);
 863
 864     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 865     if (qdev_init(vdev) < 0) {
 866         return -1;
 867     }
 868
 869     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 870 }
 871
 872 static void balloon_ccw_stats_get_all(Object *obj, struct Visitor *v,
 873                                       void *opaque, const char *name,
 874                                       Error **errp)
 875 {
 876     VirtIOBalloonCcw *dev = opaque;
 877     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
 878 }
 879
 880 static void balloon_ccw_stats_get_poll_interval(Object *obj, struct Visitor *v,
 881                                                 void *opaque, const char *name,
 882                                                 Error **errp)
 883 {
 884     VirtIOBalloonCcw *dev = opaque;
 885     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
 886                         errp);
 887 }
 888
 889 static void balloon_ccw_stats_set_poll_interval(Object *obj, struct Visitor *v,
 890                                                 void *opaque, const char *name,
 891                                                 Error **errp)
 892 {
 893     VirtIOBalloonCcw *dev = opaque;
 894     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
 895                         errp);
 896 }
 897
 898 static void virtio_ccw_balloon_instance_init(Object *obj)
 899 {
 900     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(obj);
 901     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 902                                 TYPE_VIRTIO_BALLOON);
 903     object_property_add(obj, "guest-stats", "guest statistics",
 904                         balloon_ccw_stats_get_all, NULL, NULL, dev, NULL);
 905
 906     object_property_add(obj, "guest-stats-polling-interval", "int",
 907                         balloon_ccw_stats_get_poll_interval,
 908                         balloon_ccw_stats_set_poll_interval,
 909                         NULL, dev, NULL);
 910 }
 911
 912 static int virtio_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
 913 {
 914     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
 915     DeviceState *vdev = DEVICE(&dev->vdev);
 916     DeviceState *qdev = DEVICE(ccw_dev);
 917     char *bus_name;
 918
 919     /*
 920      * For command line compatibility, this sets the virtio-scsi-device bus
 921      * name as before.
 922      */
 923     if (qdev->id) {
 924         bus_name = g_strdup_printf("%s.0", qdev->id);
 925         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 926         g_free(bus_name);
 927     }
 928
 929     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 930     if (qdev_init(vdev) < 0) {
 931         return -1;
 932     }
 933
 934     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 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 int vhost_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
 949 {
 950     VHostSCSICcw *dev = VHOST_SCSI_CCW(ccw_dev);
 951     DeviceState *vdev = DEVICE(&dev->vdev);
 952
 953     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 954     if (qdev_init(vdev) < 0) {
 955         return -1;
 956     }
 957
 958     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 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 int virtio_ccw_rng_init(VirtioCcwDevice *ccw_dev)
 971 {
 972     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(ccw_dev);
 973     DeviceState *vdev = DEVICE(&dev->vdev);
 974
 975     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 976     if (qdev_init(vdev) < 0) {
 977         return -1;
 978     }
 979
 980     object_property_set_link(OBJECT(dev),
 981                              OBJECT(dev->vdev.conf.rng), "rng",
 982                              NULL);
 983
 984     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 985 }
 986
 987 /* DeviceState to VirtioCcwDevice. Note: used on datapath,
 988  * be careful and test performance if you change this.
 989  */
 990 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d)
 991 {
 992     return container_of(d, VirtioCcwDevice, parent_obj);
 993 }
 994
 995 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
 996                                      uint8_t to_be_set)
 997 {
 998     uint8_t ind_old, ind_new;
 999     hwaddr len = 1;
1000     uint8_t *ind_addr;
1001
1002     ind_addr = cpu_physical_memory_map(ind_loc, &len, 1);
1003     if (!ind_addr) {
1004         error_report("%s(%x.%x.%04x): unable to access indicator",
1005                      __func__, sch->cssid, sch->ssid, sch->schid);
1006         return -1;
1007     }
1008     do {
1009         ind_old = *ind_addr;
1010         ind_new = ind_old | to_be_set;
1011     } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
1012     cpu_physical_memory_unmap(ind_addr, len, 1, len);
1013
1014     return ind_old;
1015 }
1016
1017 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
1018 {
1019     VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
1020     SubchDev *sch = dev->sch;
1021     uint64_t indicators;
1022
1023     if (vector >= 128) {
1024         return;
1025     }
1026
1027     if (vector < VIRTIO_PCI_QUEUE_MAX) {
1028         if (!dev->indicators) {
1029             return;
1030         }
1031         if (sch->thinint_active) {
1032             /*
1033              * In the adapter interrupt case, indicators points to a
1034              * memory area that may be (way) larger than 64 bit and
1035              * ind_bit indicates the start of the indicators in a big
1036              * endian notation.
1037              */
1038             uint64_t ind_bit = dev->routes.adapter.ind_offset;
1039
1040             virtio_set_ind_atomic(sch, dev->indicators->addr +
1041                                   (ind_bit + vector) / 8,
1042                                   0x80 >> ((ind_bit + vector) % 8));
1043             if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr,
1044                                        0x01)) {
1045                 css_adapter_interrupt(dev->thinint_isc);
1046             }
1047         } else {
1048             indicators = ldq_phys(&address_space_memory, dev->indicators->addr);
1049             indicators |= 1ULL << vector;
1050             stq_phys(&address_space_memory, dev->indicators->addr, indicators);
1051             css_conditional_io_interrupt(sch);
1052         }
1053     } else {
1054         if (!dev->indicators2) {
1055             return;
1056         }
1057         vector = 0;
1058         indicators = ldq_phys(&address_space_memory, dev->indicators2->addr);
1059         indicators |= 1ULL << vector;
1060         stq_phys(&address_space_memory, dev->indicators2->addr, indicators);
1061         css_conditional_io_interrupt(sch);
1062     }
1063 }
1064
1065 static unsigned virtio_ccw_get_features(DeviceState *d)
1066 {
1067     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1068
1069     /* Only the first 32 feature bits are used. */
1070     return dev->host_features[0];
1071 }
1072
1073 static void virtio_ccw_reset(DeviceState *d)
1074 {
1075     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1076     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1077
1078     virtio_ccw_stop_ioeventfd(dev);
1079     virtio_reset(vdev);
1080     css_reset_sch(dev->sch);
1081     if (dev->indicators) {
1082         release_indicator(&dev->routes.adapter, dev->indicators);
1083         dev->indicators = NULL;
1084     }
1085     if (dev->indicators2) {
1086         release_indicator(&dev->routes.adapter, dev->indicators2);
1087         dev->indicators2 = NULL;
1088     }
1089     if (dev->summary_indicator) {
1090         release_indicator(&dev->routes.adapter, dev->summary_indicator);
1091         dev->summary_indicator = NULL;
1092     }
1093 }
1094
1095 static void virtio_ccw_vmstate_change(DeviceState *d, bool running)
1096 {
1097     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1098
1099     if (running) {
1100         virtio_ccw_start_ioeventfd(dev);
1101     } else {
1102         virtio_ccw_stop_ioeventfd(dev);
1103     }
1104 }
1105
1106 static bool virtio_ccw_query_guest_notifiers(DeviceState *d)
1107 {
1108     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1109
1110     return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA);
1111 }
1112
1113 static int virtio_ccw_set_host_notifier(DeviceState *d, int n, bool assign)
1114 {
1115     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1116
1117     /* Stop using the generic ioeventfd, we are doing eventfd handling
1118      * ourselves below */
1119     dev->ioeventfd_disabled = assign;
1120     if (assign) {
1121         virtio_ccw_stop_ioeventfd(dev);
1122     }
1123     return virtio_ccw_set_guest2host_notifier(dev, n, assign, false);
1124 }
1125
1126 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev)
1127 {
1128     int r;
1129
1130     if (!dev->sch->thinint_active) {
1131         return -EINVAL;
1132     }
1133
1134     r = map_indicator(&dev->routes.adapter, dev->summary_indicator);
1135     if (r) {
1136         return r;
1137     }
1138     r = map_indicator(&dev->routes.adapter, dev->indicators);
1139     if (r) {
1140         return r;
1141     }
1142     dev->routes.adapter.summary_addr = dev->summary_indicator->map;
1143     dev->routes.adapter.ind_addr = dev->indicators->map;
1144
1145     return 0;
1146 }
1147
1148 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs)
1149 {
1150     int i;
1151     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1152     int ret;
1153     S390FLICState *fs = s390_get_flic();
1154     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1155
1156     ret = virtio_ccw_get_mappings(dev);
1157     if (ret) {
1158         return ret;
1159     }
1160     for (i = 0; i < nvqs; i++) {
1161         if (!virtio_queue_get_num(vdev, i)) {
1162             break;
1163         }
1164     }
1165     dev->routes.num_routes = i;
1166     return fsc->add_adapter_routes(fs, &dev->routes);
1167 }
1168
1169 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs)
1170 {
1171     S390FLICState *fs = s390_get_flic();
1172     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1173
1174     fsc->release_adapter_routes(fs, &dev->routes);
1175 }
1176
1177 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n)
1178 {
1179     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1180     VirtQueue *vq = virtio_get_queue(vdev, n);
1181     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1182
1183     return kvm_irqchip_add_irqfd_notifier(kvm_state, notifier, NULL,
1184                                           dev->routes.gsi[n]);
1185 }
1186
1187 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n)
1188 {
1189     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1190     VirtQueue *vq = virtio_get_queue(vdev, n);
1191     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1192     int ret;
1193
1194     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, notifier,
1195                                             dev->routes.gsi[n]);
1196     assert(ret == 0);
1197 }
1198
1199 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
1200                                          bool assign, bool with_irqfd)
1201 {
1202     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1203     VirtQueue *vq = virtio_get_queue(vdev, n);
1204     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1205     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
1206
1207     if (assign) {
1208         int r = event_notifier_init(notifier, 0);
1209
1210         if (r < 0) {
1211             return r;
1212         }
1213         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
1214         if (with_irqfd) {
1215             r = virtio_ccw_add_irqfd(dev, n);
1216             if (r) {
1217                 virtio_queue_set_guest_notifier_fd_handler(vq, false,
1218                                                            with_irqfd);
1219                 return r;
1220             }
1221         }
1222         /*
1223          * We do not support individual masking for channel devices, so we
1224          * need to manually trigger any guest masking callbacks here.
1225          */
1226         if (k->guest_notifier_mask) {
1227             k->guest_notifier_mask(vdev, n, false);
1228         }
1229         /* get lost events and re-inject */
1230         if (k->guest_notifier_pending &&
1231             k->guest_notifier_pending(vdev, n)) {
1232             event_notifier_set(notifier);
1233         }
1234     } else {
1235         if (k->guest_notifier_mask) {
1236             k->guest_notifier_mask(vdev, n, true);
1237         }
1238         if (with_irqfd) {
1239             virtio_ccw_remove_irqfd(dev, n);
1240         }
1241         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
1242         event_notifier_cleanup(notifier);
1243     }
1244     return 0;
1245 }
1246
1247 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs,
1248                                           bool assigned)
1249 {
1250     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1251     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1252     bool with_irqfd = dev->sch->thinint_active && kvm_irqfds_enabled();
1253     int r, n;
1254
1255     if (with_irqfd && assigned) {
1256         /* irq routes need to be set up before assigning irqfds */
1257         r = virtio_ccw_setup_irqroutes(dev, nvqs);
1258         if (r < 0) {
1259             goto irqroute_error;
1260         }
1261     }
1262     for (n = 0; n < nvqs; n++) {
1263         if (!virtio_queue_get_num(vdev, n)) {
1264             break;
1265         }
1266         r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd);
1267         if (r < 0) {
1268             goto assign_error;
1269         }
1270     }
1271     if (with_irqfd && !assigned) {
1272         /* release irq routes after irqfds have been released */
1273         virtio_ccw_release_irqroutes(dev, nvqs);
1274     }
1275     return 0;
1276
1277 assign_error:
1278     while (--n >= 0) {
1279         virtio_ccw_set_guest_notifier(dev, n, !assigned, false);
1280     }
1281 irqroute_error:
1282     if (with_irqfd && assigned) {
1283         virtio_ccw_release_irqroutes(dev, nvqs);
1284     }
1285     return r;
1286 }
1287
1288 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f)
1289 {
1290     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1291     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1292
1293     qemu_put_be16(f, virtio_queue_vector(vdev, n));
1294 }
1295
1296 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f)
1297 {
1298     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1299     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1300     uint16_t vector;
1301
1302     qemu_get_be16s(f, &vector);
1303     virtio_queue_set_vector(vdev, n , vector);
1304
1305     return 0;
1306 }
1307
1308 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
1309 {
1310     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1311     SubchDev *s = dev->sch;
1312
1313     subch_device_save(s, f);
1314     if (dev->indicators != NULL) {
1315         qemu_put_be32(f, dev->indicators->len);
1316         qemu_put_be64(f, dev->indicators->addr);
1317     } else {
1318         qemu_put_be32(f, 0);
1319         qemu_put_be64(f, 0UL);
1320     }
1321     if (dev->indicators2 != NULL) {
1322         qemu_put_be32(f, dev->indicators2->len);
1323         qemu_put_be64(f, dev->indicators2->addr);
1324     } else {
1325         qemu_put_be32(f, 0);
1326         qemu_put_be64(f, 0UL);
1327     }
1328     if (dev->summary_indicator != NULL) {
1329         qemu_put_be32(f, dev->summary_indicator->len);
1330         qemu_put_be64(f, dev->summary_indicator->addr);
1331     } else {
1332         qemu_put_be32(f, 0);
1333         qemu_put_be64(f, 0UL);
1334     }
1335     qemu_put_be64(f, dev->routes.adapter.ind_offset);
1336     qemu_put_byte(f, dev->thinint_isc);
1337 }
1338
1339 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
1340 {
1341     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1342     SubchDev *s = dev->sch;
1343     int len;
1344
1345     s->driver_data = dev;
1346     subch_device_load(s, f);
1347     len = qemu_get_be32(f);
1348     if (len != 0) {
1349         dev->indicators = get_indicator(qemu_get_be64(f), len);
1350     } else {
1351         qemu_get_be64(f);
1352         dev->indicators = NULL;
1353     }
1354     len = qemu_get_be32(f);
1355     if (len != 0) {
1356         dev->indicators2 = get_indicator(qemu_get_be64(f), len);
1357     } else {
1358         qemu_get_be64(f);
1359         dev->indicators2 = NULL;
1360     }
1361     len = qemu_get_be32(f);
1362     if (len != 0) {
1363         dev->summary_indicator = get_indicator(qemu_get_be64(f), len);
1364     } else {
1365         qemu_get_be64(f);
1366         dev->summary_indicator = NULL;
1367     }
1368     dev->routes.adapter.ind_offset = qemu_get_be64(f);
1369     dev->thinint_isc = qemu_get_byte(f);
1370     if (s->thinint_active) {
1371         return css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
1372                                        dev->thinint_isc, true, false,
1373                                        &dev->routes.adapter.adapter_id);
1374     }
1375
1376     return 0;
1377 }
1378
1379 /**************** Virtio-ccw Bus Device Descriptions *******************/
1380
1381 static Property virtio_ccw_net_properties[] = {
1382     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1383     DEFINE_VIRTIO_NET_FEATURES(VirtioCcwDevice, host_features[0]),
1384     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1385                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1386     DEFINE_PROP_END_OF_LIST(),
1387 };
1388
1389 static void virtio_ccw_net_class_init(ObjectClass *klass, void *data)
1390 {
1391     DeviceClass *dc = DEVICE_CLASS(klass);
1392     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1393
1394     k->init = virtio_ccw_net_init;
1395     k->exit = virtio_ccw_exit;
1396     dc->reset = virtio_ccw_reset;
1397     dc->props = virtio_ccw_net_properties;
1398 }
1399
1400 static const TypeInfo virtio_ccw_net = {
1401     .name          = TYPE_VIRTIO_NET_CCW,
1402     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1403     .instance_size = sizeof(VirtIONetCcw),
1404     .instance_init = virtio_ccw_net_instance_init,
1405     .class_init    = virtio_ccw_net_class_init,
1406 };
1407
1408 static Property virtio_ccw_blk_properties[] = {
1409     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1410     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1411                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1412     DEFINE_PROP_END_OF_LIST(),
1413 };
1414
1415 static void virtio_ccw_blk_class_init(ObjectClass *klass, void *data)
1416 {
1417     DeviceClass *dc = DEVICE_CLASS(klass);
1418     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1419
1420     k->init = virtio_ccw_blk_init;
1421     k->exit = virtio_ccw_exit;
1422     dc->reset = virtio_ccw_reset;
1423     dc->props = virtio_ccw_blk_properties;
1424 }
1425
1426 static const TypeInfo virtio_ccw_blk = {
1427     .name          = TYPE_VIRTIO_BLK_CCW,
1428     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1429     .instance_size = sizeof(VirtIOBlkCcw),
1430     .instance_init = virtio_ccw_blk_instance_init,
1431     .class_init    = virtio_ccw_blk_class_init,
1432 };
1433
1434 static Property virtio_ccw_serial_properties[] = {
1435     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1436     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1437                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1438     DEFINE_PROP_END_OF_LIST(),
1439 };
1440
1441 static void virtio_ccw_serial_class_init(ObjectClass *klass, void *data)
1442 {
1443     DeviceClass *dc = DEVICE_CLASS(klass);
1444     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1445
1446     k->init = virtio_ccw_serial_init;
1447     k->exit = virtio_ccw_exit;
1448     dc->reset = virtio_ccw_reset;
1449     dc->props = virtio_ccw_serial_properties;
1450 }
1451
1452 static const TypeInfo virtio_ccw_serial = {
1453     .name          = TYPE_VIRTIO_SERIAL_CCW,
1454     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1455     .instance_size = sizeof(VirtioSerialCcw),
1456     .instance_init = virtio_ccw_serial_instance_init,
1457     .class_init    = virtio_ccw_serial_class_init,
1458 };
1459
1460 static Property virtio_ccw_balloon_properties[] = {
1461     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1462     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1463                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1464     DEFINE_PROP_END_OF_LIST(),
1465 };
1466
1467 static void virtio_ccw_balloon_class_init(ObjectClass *klass, void *data)
1468 {
1469     DeviceClass *dc = DEVICE_CLASS(klass);
1470     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1471
1472     k->init = virtio_ccw_balloon_init;
1473     k->exit = virtio_ccw_exit;
1474     dc->reset = virtio_ccw_reset;
1475     dc->props = virtio_ccw_balloon_properties;
1476 }
1477
1478 static const TypeInfo virtio_ccw_balloon = {
1479     .name          = TYPE_VIRTIO_BALLOON_CCW,
1480     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1481     .instance_size = sizeof(VirtIOBalloonCcw),
1482     .instance_init = virtio_ccw_balloon_instance_init,
1483     .class_init    = virtio_ccw_balloon_class_init,
1484 };
1485
1486 static Property virtio_ccw_scsi_properties[] = {
1487     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1488     DEFINE_VIRTIO_SCSI_FEATURES(VirtioCcwDevice, host_features[0]),
1489     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1490                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1491     DEFINE_PROP_END_OF_LIST(),
1492 };
1493
1494 static void virtio_ccw_scsi_class_init(ObjectClass *klass, void *data)
1495 {
1496     DeviceClass *dc = DEVICE_CLASS(klass);
1497     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1498
1499     k->init = virtio_ccw_scsi_init;
1500     k->exit = virtio_ccw_exit;
1501     dc->reset = virtio_ccw_reset;
1502     dc->props = virtio_ccw_scsi_properties;
1503 }
1504
1505 static const TypeInfo virtio_ccw_scsi = {
1506     .name          = TYPE_VIRTIO_SCSI_CCW,
1507     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1508     .instance_size = sizeof(VirtIOSCSICcw),
1509     .instance_init = virtio_ccw_scsi_instance_init,
1510     .class_init    = virtio_ccw_scsi_class_init,
1511 };
1512
1513 #ifdef CONFIG_VHOST_SCSI
1514 static Property vhost_ccw_scsi_properties[] = {
1515     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1516     DEFINE_PROP_END_OF_LIST(),
1517 };
1518
1519 static void vhost_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->init = vhost_ccw_scsi_init;
1525     k->exit = virtio_ccw_exit;
1526     dc->reset = virtio_ccw_reset;
1527     dc->props = vhost_ccw_scsi_properties;
1528 }
1529
1530 static const TypeInfo vhost_ccw_scsi = {
1531     .name          = TYPE_VHOST_SCSI_CCW,
1532     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1533     .instance_size = sizeof(VHostSCSICcw),
1534     .instance_init = vhost_ccw_scsi_instance_init,
1535     .class_init    = vhost_ccw_scsi_class_init,
1536 };
1537 #endif
1538
1539 static void virtio_ccw_rng_instance_init(Object *obj)
1540 {
1541     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(obj);
1542
1543     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1544                                 TYPE_VIRTIO_RNG);
1545     object_property_add_alias(obj, "rng", OBJECT(&dev->vdev),
1546                               "rng", &error_abort);
1547 }
1548
1549 static Property virtio_ccw_rng_properties[] = {
1550     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1551     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1552                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1553     DEFINE_PROP_END_OF_LIST(),
1554 };
1555
1556 static void virtio_ccw_rng_class_init(ObjectClass *klass, void *data)
1557 {
1558     DeviceClass *dc = DEVICE_CLASS(klass);
1559     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1560
1561     k->init = virtio_ccw_rng_init;
1562     k->exit = virtio_ccw_exit;
1563     dc->reset = virtio_ccw_reset;
1564     dc->props = virtio_ccw_rng_properties;
1565 }
1566
1567 static const TypeInfo virtio_ccw_rng = {
1568     .name          = TYPE_VIRTIO_RNG_CCW,
1569     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1570     .instance_size = sizeof(VirtIORNGCcw),
1571     .instance_init = virtio_ccw_rng_instance_init,
1572     .class_init    = virtio_ccw_rng_class_init,
1573 };
1574
1575 static int virtio_ccw_busdev_init(DeviceState *dev)
1576 {
1577     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1578     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1579
1580     virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
1581
1582     return _info->init(_dev);
1583 }
1584
1585 static int virtio_ccw_busdev_exit(DeviceState *dev)
1586 {
1587     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1588     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1589
1590     return _info->exit(_dev);
1591 }
1592
1593 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev,
1594                                      DeviceState *dev, Error **errp)
1595 {
1596     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1597     SubchDev *sch = _dev->sch;
1598
1599     virtio_ccw_stop_ioeventfd(_dev);
1600
1601     /*
1602      * We should arrive here only for device_del, since we don't support
1603      * direct hot(un)plug of channels, but only through virtio.
1604      */
1605     assert(sch != NULL);
1606     /* Subchannel is now disabled and no longer valid. */
1607     sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA |
1608                                      PMCW_FLAGS_MASK_DNV);
1609
1610     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
1611
1612     object_unparent(OBJECT(dev));
1613 }
1614
1615 static Property virtio_ccw_properties[] = {
1616     DEFINE_VIRTIO_COMMON_FEATURES(VirtioCcwDevice, host_features[0]),
1617     DEFINE_PROP_END_OF_LIST(),
1618 };
1619
1620 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
1621 {
1622     DeviceClass *dc = DEVICE_CLASS(klass);
1623
1624     dc->props = virtio_ccw_properties;
1625     dc->init = virtio_ccw_busdev_init;
1626     dc->exit = virtio_ccw_busdev_exit;
1627     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
1628 }
1629
1630 static const TypeInfo virtio_ccw_device_info = {
1631     .name = TYPE_VIRTIO_CCW_DEVICE,
1632     .parent = TYPE_DEVICE,
1633     .instance_size = sizeof(VirtioCcwDevice),
1634     .class_init = virtio_ccw_device_class_init,
1635     .class_size = sizeof(VirtIOCCWDeviceClass),
1636     .abstract = true,
1637 };
1638
1639 /***************** Virtual-css Bus Bridge Device ********************/
1640 /* Only required to have the virtio bus as child in the system bus */
1641
1642 static int virtual_css_bridge_init(SysBusDevice *dev)
1643 {
1644     /* nothing */
1645     return 0;
1646 }
1647
1648 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
1649 {
1650     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
1651     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1652
1653     k->init = virtual_css_bridge_init;
1654     hc->unplug = virtio_ccw_busdev_unplug;
1655 }
1656
1657 static const TypeInfo virtual_css_bridge_info = {
1658     .name          = "virtual-css-bridge",
1659     .parent        = TYPE_SYS_BUS_DEVICE,
1660     .instance_size = sizeof(SysBusDevice),
1661     .class_init    = virtual_css_bridge_class_init,
1662     .interfaces = (InterfaceInfo[]) {
1663         { TYPE_HOTPLUG_HANDLER },
1664         { }
1665     }
1666 };
1667
1668 /* virtio-ccw-bus */
1669
1670 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
1671                                VirtioCcwDevice *dev)
1672 {
1673     DeviceState *qdev = DEVICE(dev);
1674     char virtio_bus_name[] = "virtio-bus";
1675
1676     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS,
1677                         qdev, virtio_bus_name);
1678 }
1679
1680 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
1681 {
1682     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1683     BusClass *bus_class = BUS_CLASS(klass);
1684
1685     bus_class->max_dev = 1;
1686     k->notify = virtio_ccw_notify;
1687     k->get_features = virtio_ccw_get_features;
1688     k->vmstate_change = virtio_ccw_vmstate_change;
1689     k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
1690     k->set_host_notifier = virtio_ccw_set_host_notifier;
1691     k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
1692     k->save_queue = virtio_ccw_save_queue;
1693     k->load_queue = virtio_ccw_load_queue;
1694     k->save_config = virtio_ccw_save_config;
1695     k->load_config = virtio_ccw_load_config;
1696 }
1697
1698 static const TypeInfo virtio_ccw_bus_info = {
1699     .name = TYPE_VIRTIO_CCW_BUS,
1700     .parent = TYPE_VIRTIO_BUS,
1701     .instance_size = sizeof(VirtioCcwBusState),
1702     .class_init = virtio_ccw_bus_class_init,
1703 };
1704
1705 static void virtio_ccw_register(void)
1706 {
1707     type_register_static(&virtio_ccw_bus_info);
1708     type_register_static(&virtual_css_bus_info);
1709     type_register_static(&virtio_ccw_device_info);
1710     type_register_static(&virtio_ccw_serial);
1711     type_register_static(&virtio_ccw_blk);
1712     type_register_static(&virtio_ccw_net);
1713     type_register_static(&virtio_ccw_balloon);
1714     type_register_static(&virtio_ccw_scsi);
1715 #ifdef CONFIG_VHOST_SCSI
1716     type_register_static(&vhost_ccw_scsi);
1717 #endif
1718     type_register_static(&virtio_ccw_rng);
1719     type_register_static(&virtual_css_bridge_info);
1720 }
1721
1722 type_init(virtio_ccw_register)