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