hw/s390-virtio-bus.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "block.h"
  22 #include "sysemu.h"
  23 #include "net.h"
  24 #include "boards.h"
  25 #include "monitor.h"
  26 #include "loader.h"
  27 #include "elf.h"
  28 #include "hw/virtio.h"
  29 #include "hw/virtio-rng.h"
  30 #include "hw/virtio-serial.h"
  31 #include "hw/virtio-net.h"
  32 #include "hw/sysbus.h"
  33 #include "kvm.h"
  34
  35 #include "hw/s390-virtio-bus.h"
  36
  37 /* #define DEBUG_S390 */
  38
  39 #ifdef DEBUG_S390
  40 #define dprintf(fmt, ...) \
  41     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  42 #else
  43 #define dprintf(fmt, ...) \
  44     do { } while (0)
  45 #endif
  46
  47 #define VIRTIO_EXT_CODE   0x2603
  48
  49 static const TypeInfo s390_virtio_bus_info = {
  50     .name = TYPE_S390_VIRTIO_BUS,
  51     .parent = TYPE_BUS,
  52     .instance_size = sizeof(VirtIOS390Bus),
  53 };
  54
  55 static const VirtIOBindings virtio_s390_bindings;
  56
  57 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev);
  58
  59 /* length of VirtIO device pages */
  60 const hwaddr virtio_size = S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
  61
  62 static void s390_virtio_bus_reset(void *opaque)
  63 {
  64     VirtIOS390Bus *bus = opaque;
  65     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
  66 }
  67
  68 void s390_virtio_reset_idx(VirtIOS390Device *dev)
  69 {
  70     int i;
  71     hwaddr idx_addr;
  72     uint8_t num_vq;
  73
  74     num_vq = s390_virtio_device_num_vq(dev);
  75     for (i = 0; i < num_vq; i++) {
  76         idx_addr = virtio_queue_get_avail_addr(dev->vdev, i) +
  77             VIRTIO_VRING_AVAIL_IDX_OFFS;
  78         stw_phys(idx_addr, 0);
  79         idx_addr = virtio_queue_get_used_addr(dev->vdev, i) +
  80             VIRTIO_VRING_USED_IDX_OFFS;
  81         stw_phys(idx_addr, 0);
  82     }
  83 }
  84
  85 VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size)
  86 {
  87     VirtIOS390Bus *bus;
  88     BusState *_bus;
  89     DeviceState *dev;
  90
  91     /* Create bridge device */
  92     dev = qdev_create(NULL, "s390-virtio-bridge");
  93     qdev_init_nofail(dev);
  94
  95     /* Create bus on bridge device */
  96
  97     _bus = qbus_create(TYPE_S390_VIRTIO_BUS, dev, "s390-virtio");
  98     bus = DO_UPCAST(VirtIOS390Bus, bus, _bus);
  99
 100     bus->dev_page = *ram_size;
 101     bus->dev_offs = bus->dev_page;
 102     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
 103
 104     /* Enable hotplugging */
 105     _bus->allow_hotplug = 1;
 106
 107     /* Allocate RAM for VirtIO device pages (descriptors, queues, rings) */
 108     *ram_size += S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
 109
 110     qemu_register_reset(s390_virtio_bus_reset, bus);
 111     return bus;
 112 }
 113
 114 static void s390_virtio_irq(CPUS390XState *env, int config_change, uint64_t token)
 115 {
 116     if (kvm_enabled()) {
 117         kvm_s390_virtio_irq(env, config_change, token);
 118     } else {
 119         cpu_inject_ext(env, VIRTIO_EXT_CODE, config_change, token);
 120     }
 121 }
 122
 123 static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
 124 {
 125     VirtIOS390Bus *bus;
 126     int dev_len;
 127
 128     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 129     dev->vdev = vdev;
 130     dev->dev_offs = bus->dev_offs;
 131     dev->feat_len = sizeof(uint32_t); /* always keep 32 bits features */
 132
 133     dev_len = VIRTIO_DEV_OFFS_CONFIG;
 134     dev_len += s390_virtio_device_num_vq(dev) * VIRTIO_VQCONFIG_LEN;
 135     dev_len += dev->feat_len * 2;
 136     dev_len += vdev->config_len;
 137
 138     bus->dev_offs += dev_len;
 139
 140     virtio_bind_device(vdev, &virtio_s390_bindings, dev);
 141     dev->host_features = vdev->get_features(vdev, dev->host_features);
 142     s390_virtio_device_sync(dev);
 143     s390_virtio_reset_idx(dev);
 144     if (dev->qdev.hotplugged) {
 145         S390CPU *cpu = s390_cpu_addr2state(0);
 146         CPUS390XState *env = &cpu->env;
 147         s390_virtio_irq(env, VIRTIO_PARAM_DEV_ADD, dev->dev_offs);
 148     }
 149
 150     return 0;
 151 }
 152
 153 static int s390_virtio_net_init(VirtIOS390Device *dev)
 154 {
 155     VirtIODevice *vdev;
 156
 157     vdev = virtio_net_init((DeviceState *)dev, &dev->nic, &dev->net);
 158     if (!vdev) {
 159         return -1;
 160     }
 161
 162     return s390_virtio_device_init(dev, vdev);
 163 }
 164
 165 static int s390_virtio_blk_init(VirtIOS390Device *dev)
 166 {
 167     VirtIODevice *vdev;
 168
 169     vdev = virtio_blk_init((DeviceState *)dev, &dev->blk);
 170     if (!vdev) {
 171         return -1;
 172     }
 173
 174     return s390_virtio_device_init(dev, vdev);
 175 }
 176
 177 static int s390_virtio_serial_init(VirtIOS390Device *dev)
 178 {
 179     VirtIOS390Bus *bus;
 180     VirtIODevice *vdev;
 181     int r;
 182
 183     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 184
 185     vdev = virtio_serial_init((DeviceState *)dev, &dev->serial);
 186     if (!vdev) {
 187         return -1;
 188     }
 189
 190     r = s390_virtio_device_init(dev, vdev);
 191     if (!r) {
 192         bus->console = dev;
 193     }
 194
 195     return r;
 196 }
 197
 198 static int s390_virtio_scsi_init(VirtIOS390Device *dev)
 199 {
 200     VirtIODevice *vdev;
 201
 202     vdev = virtio_scsi_init((DeviceState *)dev, &dev->scsi);
 203     if (!vdev) {
 204         return -1;
 205     }
 206
 207     return s390_virtio_device_init(dev, vdev);
 208 }
 209
 210 static int s390_virtio_rng_init(VirtIOS390Device *dev)
 211 {
 212     VirtIODevice *vdev;
 213
 214     vdev = virtio_rng_init((DeviceState *)dev, &dev->rng);
 215     if (!vdev) {
 216         return -1;
 217     }
 218
 219     return s390_virtio_device_init(dev, vdev);
 220 }
 221
 222 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 223 {
 224     ram_addr_t token_off;
 225
 226     token_off = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 227                 (vq * VIRTIO_VQCONFIG_LEN) +
 228                 VIRTIO_VQCONFIG_OFFS_TOKEN;
 229
 230     return ldq_be_phys(token_off);
 231 }
 232
 233 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev)
 234 {
 235     VirtIODevice *vdev = dev->vdev;
 236     int num_vq;
 237
 238     for (num_vq = 0; num_vq < VIRTIO_PCI_QUEUE_MAX; num_vq++) {
 239         if (!virtio_queue_get_num(vdev, num_vq)) {
 240             break;
 241         }
 242     }
 243
 244     return num_vq;
 245 }
 246
 247 static ram_addr_t s390_virtio_next_ring(VirtIOS390Bus *bus)
 248 {
 249     ram_addr_t r = bus->next_ring;
 250
 251     bus->next_ring += VIRTIO_RING_LEN;
 252     return r;
 253 }
 254
 255 void s390_virtio_device_sync(VirtIOS390Device *dev)
 256 {
 257     VirtIOS390Bus *bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 258     ram_addr_t cur_offs;
 259     uint8_t num_vq;
 260     int i;
 261
 262     virtio_reset(dev->vdev);
 263
 264     /* Sync dev space */
 265     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_TYPE, dev->vdev->device_id);
 266
 267     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, s390_virtio_device_num_vq(dev));
 268     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_FEATURE_LEN, dev->feat_len);
 269
 270     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG_LEN, dev->vdev->config_len);
 271
 272     num_vq = s390_virtio_device_num_vq(dev);
 273     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, num_vq);
 274
 275     /* Sync virtqueues */
 276     for (i = 0; i < num_vq; i++) {
 277         ram_addr_t vq = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 278                         (i * VIRTIO_VQCONFIG_LEN);
 279         ram_addr_t vring;
 280
 281         vring = s390_virtio_next_ring(bus);
 282         virtio_queue_set_addr(dev->vdev, i, vring);
 283         virtio_queue_set_vector(dev->vdev, i, i);
 284         stq_be_phys(vq + VIRTIO_VQCONFIG_OFFS_ADDRESS, vring);
 285         stw_be_phys(vq + VIRTIO_VQCONFIG_OFFS_NUM, virtio_queue_get_num(dev->vdev, i));
 286     }
 287
 288     cur_offs = dev->dev_offs;
 289     cur_offs += VIRTIO_DEV_OFFS_CONFIG;
 290     cur_offs += num_vq * VIRTIO_VQCONFIG_LEN;
 291
 292     /* Sync feature bitmap */
 293     stl_le_phys(cur_offs, dev->host_features);
 294
 295     dev->feat_offs = cur_offs + dev->feat_len;
 296     cur_offs += dev->feat_len * 2;
 297
 298     /* Sync config space */
 299     if (dev->vdev->get_config) {
 300         dev->vdev->get_config(dev->vdev, dev->vdev->config);
 301     }
 302
 303     cpu_physical_memory_write(cur_offs,
 304                               dev->vdev->config, dev->vdev->config_len);
 305     cur_offs += dev->vdev->config_len;
 306 }
 307
 308 void s390_virtio_device_update_status(VirtIOS390Device *dev)
 309 {
 310     VirtIODevice *vdev = dev->vdev;
 311     uint32_t features;
 312
 313     virtio_set_status(vdev, ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS));
 314
 315     /* Update guest supported feature bitmap */
 316
 317     features = bswap32(ldl_be_phys(dev->feat_offs));
 318     virtio_set_features(vdev, features);
 319 }
 320
 321 VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)
 322 {
 323     return bus->console;
 324 }
 325
 326 /* Find a device by vring address */
 327 VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus,
 328                                              ram_addr_t mem,
 329                                              int *vq_num)
 330 {
 331     BusChild *kid;
 332     int i;
 333
 334     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 335         VirtIOS390Device *dev = (VirtIOS390Device *)kid->child;
 336
 337         for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
 338             if (!virtio_queue_get_addr(dev->vdev, i))
 339                 break;
 340             if (virtio_queue_get_addr(dev->vdev, i) == mem) {
 341                 if (vq_num) {
 342                     *vq_num = i;
 343                 }
 344                 return dev;
 345             }
 346         }
 347     }
 348
 349     return NULL;
 350 }
 351
 352 /* Find a device by device descriptor location */
 353 VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
 354 {
 355     BusChild *kid;
 356
 357     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 358         VirtIOS390Device *dev = (VirtIOS390Device *)kid->child;
 359         if (dev->dev_offs == mem) {
 360             return dev;
 361         }
 362     }
 363
 364     return NULL;
 365 }
 366
 367 static void virtio_s390_notify(void *opaque, uint16_t vector)
 368 {
 369     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 370     uint64_t token = s390_virtio_device_vq_token(dev, vector);
 371     S390CPU *cpu = s390_cpu_addr2state(0);
 372     CPUS390XState *env = &cpu->env;
 373
 374     s390_virtio_irq(env, 0, token);
 375 }
 376
 377 static unsigned virtio_s390_get_features(void *opaque)
 378 {
 379     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 380     return dev->host_features;
 381 }
 382
 383 /**************** S390 Virtio Bus Device Descriptions *******************/
 384
 385 static const VirtIOBindings virtio_s390_bindings = {
 386     .notify = virtio_s390_notify,
 387     .get_features = virtio_s390_get_features,
 388 };
 389
 390 static Property s390_virtio_net_properties[] = {
 391     DEFINE_NIC_PROPERTIES(VirtIOS390Device, nic),
 392     DEFINE_PROP_UINT32("x-txtimer", VirtIOS390Device,
 393                        net.txtimer, TX_TIMER_INTERVAL),
 394     DEFINE_PROP_INT32("x-txburst", VirtIOS390Device,
 395                       net.txburst, TX_BURST),
 396     DEFINE_PROP_STRING("tx", VirtIOS390Device, net.tx),
 397     DEFINE_PROP_END_OF_LIST(),
 398 };
 399
 400 static void s390_virtio_net_class_init(ObjectClass *klass, void *data)
 401 {
 402     DeviceClass *dc = DEVICE_CLASS(klass);
 403     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 404
 405     k->init = s390_virtio_net_init;
 406     dc->props = s390_virtio_net_properties;
 407 }
 408
 409 static TypeInfo s390_virtio_net = {
 410     .name          = "virtio-net-s390",
 411     .parent        = TYPE_VIRTIO_S390_DEVICE,
 412     .instance_size = sizeof(VirtIOS390Device),
 413     .class_init    = s390_virtio_net_class_init,
 414 };
 415
 416 static Property s390_virtio_blk_properties[] = {
 417     DEFINE_BLOCK_PROPERTIES(VirtIOS390Device, blk.conf),
 418     DEFINE_BLOCK_CHS_PROPERTIES(VirtIOS390Device, blk.conf),
 419     DEFINE_PROP_STRING("serial", VirtIOS390Device, blk.serial),
 420 #ifdef __linux__
 421     DEFINE_PROP_BIT("scsi", VirtIOS390Device, blk.scsi, 0, true),
 422 #endif
 423     DEFINE_PROP_END_OF_LIST(),
 424 };
 425
 426 static void s390_virtio_blk_class_init(ObjectClass *klass, void *data)
 427 {
 428     DeviceClass *dc = DEVICE_CLASS(klass);
 429     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 430
 431     k->init = s390_virtio_blk_init;
 432     dc->props = s390_virtio_blk_properties;
 433 }
 434
 435 static TypeInfo s390_virtio_blk = {
 436     .name          = "virtio-blk-s390",
 437     .parent        = TYPE_VIRTIO_S390_DEVICE,
 438     .instance_size = sizeof(VirtIOS390Device),
 439     .class_init    = s390_virtio_blk_class_init,
 440 };
 441
 442 static Property s390_virtio_serial_properties[] = {
 443     DEFINE_PROP_UINT32("max_ports", VirtIOS390Device,
 444                        serial.max_virtserial_ports, 31),
 445     DEFINE_PROP_END_OF_LIST(),
 446 };
 447
 448 static void s390_virtio_serial_class_init(ObjectClass *klass, void *data)
 449 {
 450     DeviceClass *dc = DEVICE_CLASS(klass);
 451     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 452
 453     k->init = s390_virtio_serial_init;
 454     dc->props = s390_virtio_serial_properties;
 455 }
 456
 457 static TypeInfo s390_virtio_serial = {
 458     .name          = "virtio-serial-s390",
 459     .parent        = TYPE_VIRTIO_S390_DEVICE,
 460     .instance_size = sizeof(VirtIOS390Device),
 461     .class_init    = s390_virtio_serial_class_init,
 462 };
 463
 464 static void s390_virtio_rng_initfn(Object *obj)
 465 {
 466     VirtIOS390Device *dev = VIRTIO_S390_DEVICE(obj);
 467
 468     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
 469                              (Object **)&dev->rng.rng, NULL);
 470 }
 471
 472 static void s390_virtio_rng_class_init(ObjectClass *klass, void *data)
 473 {
 474     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 475
 476     k->init = s390_virtio_rng_init;
 477 }
 478
 479 static TypeInfo s390_virtio_rng = {
 480     .name          = "virtio-rng-s390",
 481     .parent        = TYPE_VIRTIO_S390_DEVICE,
 482     .instance_size = sizeof(VirtIOS390Device),
 483     .instance_init = s390_virtio_rng_initfn,
 484     .class_init    = s390_virtio_rng_class_init,
 485 };
 486
 487 static int s390_virtio_busdev_init(DeviceState *dev)
 488 {
 489     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 490     VirtIOS390DeviceClass *_info = VIRTIO_S390_DEVICE_GET_CLASS(dev);
 491
 492     return _info->init(_dev);
 493 }
 494
 495 static void virtio_s390_device_class_init(ObjectClass *klass, void *data)
 496 {
 497     DeviceClass *dc = DEVICE_CLASS(klass);
 498
 499     dc->init = s390_virtio_busdev_init;
 500     dc->bus_type = TYPE_S390_VIRTIO_BUS;
 501     dc->unplug = qdev_simple_unplug_cb;
 502 }
 503
 504 static TypeInfo virtio_s390_device_info = {
 505     .name = TYPE_VIRTIO_S390_DEVICE,
 506     .parent = TYPE_DEVICE,
 507     .instance_size = sizeof(VirtIOS390Device),
 508     .class_init = virtio_s390_device_class_init,
 509     .class_size = sizeof(VirtIOS390DeviceClass),
 510     .abstract = true,
 511 };
 512
 513 static Property s390_virtio_scsi_properties[] = {
 514     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOS390Device, host_features, scsi),
 515     DEFINE_PROP_END_OF_LIST(),
 516 };
 517
 518 static void s390_virtio_scsi_class_init(ObjectClass *klass, void *data)
 519 {
 520     DeviceClass *dc = DEVICE_CLASS(klass);
 521     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 522
 523     k->init = s390_virtio_scsi_init;
 524     dc->props = s390_virtio_scsi_properties;
 525 }
 526
 527 static TypeInfo s390_virtio_scsi = {
 528     .name          = "virtio-scsi-s390",
 529     .parent        = TYPE_VIRTIO_S390_DEVICE,
 530     .instance_size = sizeof(VirtIOS390Device),
 531     .class_init    = s390_virtio_scsi_class_init,
 532 };
 533
 534 /***************** S390 Virtio Bus Bridge Device *******************/
 535 /* Only required to have the virtio bus as child in the system bus */
 536
 537 static int s390_virtio_bridge_init(SysBusDevice *dev)
 538 {
 539     /* nothing */
 540     return 0;
 541 }
 542
 543 static void s390_virtio_bridge_class_init(ObjectClass *klass, void *data)
 544 {
 545     DeviceClass *dc = DEVICE_CLASS(klass);
 546     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 547
 548     k->init = s390_virtio_bridge_init;
 549     dc->no_user = 1;
 550 }
 551
 552 static TypeInfo s390_virtio_bridge_info = {
 553     .name          = "s390-virtio-bridge",
 554     .parent        = TYPE_SYS_BUS_DEVICE,
 555     .instance_size = sizeof(SysBusDevice),
 556     .class_init    = s390_virtio_bridge_class_init,
 557 };
 558
 559 static void s390_virtio_register_types(void)
 560 {
 561     type_register_static(&s390_virtio_bus_info);
 562     type_register_static(&virtio_s390_device_info);
 563     type_register_static(&s390_virtio_serial);
 564     type_register_static(&s390_virtio_blk);
 565     type_register_static(&s390_virtio_net);
 566     type_register_static(&s390_virtio_scsi);
 567     type_register_static(&s390_virtio_rng);
 568     type_register_static(&s390_virtio_bridge_info);
 569 }
 570
 571 type_init(s390_virtio_register_types)