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 VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size)
  61 {
  62     VirtIOS390Bus *bus;
  63     BusState *_bus;
  64     DeviceState *dev;
  65
  66     /* Create bridge device */
  67     dev = qdev_create(NULL, "s390-virtio-bridge");
  68     qdev_init_nofail(dev);
  69
  70     /* Create bus on bridge device */
  71
  72     _bus = qbus_create(&s390_virtio_bus_info, dev, "s390-virtio");
  73     bus = DO_UPCAST(VirtIOS390Bus, bus, _bus);
  74
  75     bus->dev_page = *ram_size;
  76     bus->dev_offs = bus->dev_page;
  77     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
  78
  79     /* Enable hotplugging */
  80     _bus->allow_hotplug = 1;
  81
  82     /* Allocate RAM for VirtIO device pages (descriptors, queues, rings) */
  83     *ram_size += S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
  84
  85     return bus;
  86 }
  87
  88 static void s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
  89 {
  90     if (kvm_enabled()) {
  91         kvm_s390_virtio_irq(env, config_change, token);
  92     } else {
  93         cpu_inject_ext(env, VIRTIO_EXT_CODE, config_change, token);
  94     }
  95 }
  96
  97 static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
  98 {
  99     VirtIOS390Bus *bus;
 100     int dev_len;
 101
 102     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 103     dev->vdev = vdev;
 104     dev->dev_offs = bus->dev_offs;
 105     dev->feat_len = sizeof(uint32_t); /* always keep 32 bits features */
 106
 107     dev_len = VIRTIO_DEV_OFFS_CONFIG;
 108     dev_len += s390_virtio_device_num_vq(dev) * VIRTIO_VQCONFIG_LEN;
 109     dev_len += dev->feat_len * 2;
 110     dev_len += vdev->config_len;
 111
 112     bus->dev_offs += dev_len;
 113
 114     virtio_bind_device(vdev, &virtio_s390_bindings, dev);
 115     dev->host_features = vdev->get_features(vdev, dev->host_features);
 116     s390_virtio_device_sync(dev);
 117
 118     if (dev->qdev.hotplugged) {
 119         CPUState *env = s390_cpu_addr2state(0);
 120         s390_virtio_irq(env, VIRTIO_PARAM_DEV_ADD, dev->dev_offs);
 121     }
 122
 123     return 0;
 124 }
 125
 126 static int s390_virtio_net_init(VirtIOS390Device *dev)
 127 {
 128     VirtIODevice *vdev;
 129
 130     vdev = virtio_net_init((DeviceState *)dev, &dev->nic, &dev->net);
 131     if (!vdev) {
 132         return -1;
 133     }
 134
 135     return s390_virtio_device_init(dev, vdev);
 136 }
 137
 138 static int s390_virtio_blk_init(VirtIOS390Device *dev)
 139 {
 140     VirtIODevice *vdev;
 141
 142     vdev = virtio_blk_init((DeviceState *)dev, &dev->block,
 143                            &dev->block_serial);
 144     if (!vdev) {
 145         return -1;
 146     }
 147
 148     return s390_virtio_device_init(dev, vdev);
 149 }
 150
 151 static int s390_virtio_serial_init(VirtIOS390Device *dev)
 152 {
 153     VirtIOS390Bus *bus;
 154     VirtIODevice *vdev;
 155     int r;
 156
 157     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 158
 159     vdev = virtio_serial_init((DeviceState *)dev, &dev->serial);
 160     if (!vdev) {
 161         return -1;
 162     }
 163
 164     r = s390_virtio_device_init(dev, vdev);
 165     if (!r) {
 166         bus->console = dev;
 167     }
 168
 169     return r;
 170 }
 171
 172 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 173 {
 174     ram_addr_t token_off;
 175
 176     token_off = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 177                 (vq * VIRTIO_VQCONFIG_LEN) +
 178                 VIRTIO_VQCONFIG_OFFS_TOKEN;
 179
 180     return ldq_be_phys(token_off);
 181 }
 182
 183 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev)
 184 {
 185     VirtIODevice *vdev = dev->vdev;
 186     int num_vq;
 187
 188     for (num_vq = 0; num_vq < VIRTIO_PCI_QUEUE_MAX; num_vq++) {
 189         if (!virtio_queue_get_num(vdev, num_vq)) {
 190             break;
 191         }
 192     }
 193
 194     return num_vq;
 195 }
 196
 197 static ram_addr_t s390_virtio_next_ring(VirtIOS390Bus *bus)
 198 {
 199     ram_addr_t r = bus->next_ring;
 200
 201     bus->next_ring += VIRTIO_RING_LEN;
 202     return r;
 203 }
 204
 205 void s390_virtio_device_sync(VirtIOS390Device *dev)
 206 {
 207     VirtIOS390Bus *bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 208     ram_addr_t cur_offs;
 209     uint8_t num_vq;
 210     int i;
 211
 212     virtio_reset(dev->vdev);
 213
 214     /* Sync dev space */
 215     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_TYPE, dev->vdev->device_id);
 216
 217     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, s390_virtio_device_num_vq(dev));
 218     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_FEATURE_LEN, dev->feat_len);
 219
 220     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG_LEN, dev->vdev->config_len);
 221
 222     num_vq = s390_virtio_device_num_vq(dev);
 223     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, num_vq);
 224
 225     /* Sync virtqueues */
 226     for (i = 0; i < num_vq; i++) {
 227         ram_addr_t vq = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 228                         (i * VIRTIO_VQCONFIG_LEN);
 229         ram_addr_t vring;
 230
 231         vring = s390_virtio_next_ring(bus);
 232         virtio_queue_set_addr(dev->vdev, i, vring);
 233         virtio_queue_set_vector(dev->vdev, i, i);
 234         stq_be_phys(vq + VIRTIO_VQCONFIG_OFFS_ADDRESS, vring);
 235         stw_be_phys(vq + VIRTIO_VQCONFIG_OFFS_NUM, virtio_queue_get_num(dev->vdev, i));
 236     }
 237
 238     cur_offs = dev->dev_offs;
 239     cur_offs += VIRTIO_DEV_OFFS_CONFIG;
 240     cur_offs += num_vq * VIRTIO_VQCONFIG_LEN;
 241
 242     /* Sync feature bitmap */
 243     stl_le_phys(cur_offs, dev->host_features);
 244
 245     dev->feat_offs = cur_offs + dev->feat_len;
 246     cur_offs += dev->feat_len * 2;
 247
 248     /* Sync config space */
 249     if (dev->vdev->get_config) {
 250         dev->vdev->get_config(dev->vdev, dev->vdev->config);
 251     }
 252
 253     cpu_physical_memory_write(cur_offs,
 254                               dev->vdev->config, dev->vdev->config_len);
 255     cur_offs += dev->vdev->config_len;
 256 }
 257
 258 void s390_virtio_device_update_status(VirtIOS390Device *dev)
 259 {
 260     VirtIODevice *vdev = dev->vdev;
 261     uint32_t features;
 262
 263     virtio_set_status(vdev, ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS));
 264
 265     /* Update guest supported feature bitmap */
 266
 267     features = bswap32(ldl_be_phys(dev->feat_offs));
 268     virtio_set_features(vdev, features);
 269 }
 270
 271 VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)
 272 {
 273     return bus->console;
 274 }
 275
 276 /* Find a device by vring address */
 277 VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus,
 278                                              ram_addr_t mem,
 279                                              int *vq_num)
 280 {
 281     VirtIOS390Device *_dev;
 282     DeviceState *dev;
 283     int i;
 284
 285     QTAILQ_FOREACH(dev, &bus->bus.children, sibling) {
 286         _dev = (VirtIOS390Device *)dev;
 287         for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
 288             if (!virtio_queue_get_addr(_dev->vdev, i))
 289                 break;
 290             if (virtio_queue_get_addr(_dev->vdev, i) == mem) {
 291                 if (vq_num) {
 292                     *vq_num = i;
 293                 }
 294                 return _dev;
 295             }
 296         }
 297     }
 298
 299     return NULL;
 300 }
 301
 302 /* Find a device by device descriptor location */
 303 VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
 304 {
 305     VirtIOS390Device *_dev;
 306     DeviceState *dev;
 307
 308     QTAILQ_FOREACH(dev, &bus->bus.children, sibling) {
 309         _dev = (VirtIOS390Device *)dev;
 310         if (_dev->dev_offs == mem) {
 311             return _dev;
 312         }
 313     }
 314
 315     return NULL;
 316 }
 317
 318 static void virtio_s390_notify(void *opaque, uint16_t vector)
 319 {
 320     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 321     uint64_t token = s390_virtio_device_vq_token(dev, vector);
 322     CPUState *env = s390_cpu_addr2state(0);
 323
 324     s390_virtio_irq(env, 0, token);
 325 }
 326
 327 static unsigned virtio_s390_get_features(void *opaque)
 328 {
 329     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 330     return dev->host_features;
 331 }
 332
 333 /**************** S390 Virtio Bus Device Descriptions *******************/
 334
 335 static const VirtIOBindings virtio_s390_bindings = {
 336     .notify = virtio_s390_notify,
 337     .get_features = virtio_s390_get_features,
 338 };
 339
 340 static Property s390_virtio_net_properties[] = {
 341     DEFINE_NIC_PROPERTIES(VirtIOS390Device, nic),
 342     DEFINE_PROP_UINT32("x-txtimer", VirtIOS390Device,
 343                        net.txtimer, TX_TIMER_INTERVAL),
 344     DEFINE_PROP_INT32("x-txburst", VirtIOS390Device,
 345                       net.txburst, TX_BURST),
 346     DEFINE_PROP_STRING("tx", VirtIOS390Device, net.tx),
 347     DEFINE_PROP_END_OF_LIST(),
 348 };
 349
 350 static void s390_virtio_net_class_init(ObjectClass *klass, void *data)
 351 {
 352     DeviceClass *dc = DEVICE_CLASS(klass);
 353     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 354
 355     k->init = s390_virtio_net_init;
 356     dc->props = s390_virtio_net_properties;
 357 }
 358
 359 static TypeInfo s390_virtio_net = {
 360     .name          = "virtio-net-s390",
 361     .parent        = TYPE_VIRTIO_S390_DEVICE,
 362     .instance_size = sizeof(VirtIOS390Device),
 363     .class_init    = s390_virtio_net_class_init,
 364 };
 365
 366 static Property s390_virtio_blk_properties[] = {
 367     DEFINE_BLOCK_PROPERTIES(VirtIOS390Device, block),
 368     DEFINE_PROP_STRING("serial", VirtIOS390Device, block_serial),
 369     DEFINE_PROP_END_OF_LIST(),
 370 };
 371
 372 static void s390_virtio_blk_class_init(ObjectClass *klass, void *data)
 373 {
 374     DeviceClass *dc = DEVICE_CLASS(klass);
 375     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 376
 377     k->init = s390_virtio_blk_init;
 378     dc->props = s390_virtio_blk_properties;
 379 }
 380
 381 static TypeInfo s390_virtio_blk = {
 382     .name          = "virtio-blk-s390",
 383     .parent        = TYPE_VIRTIO_S390_DEVICE,
 384     .instance_size = sizeof(VirtIOS390Device),
 385     .class_init    = s390_virtio_blk_class_init,
 386 };
 387
 388 static Property s390_virtio_serial_properties[] = {
 389     DEFINE_PROP_UINT32("max_ports", VirtIOS390Device,
 390                        serial.max_virtserial_ports, 31),
 391     DEFINE_PROP_END_OF_LIST(),
 392 };
 393
 394 static void s390_virtio_serial_class_init(ObjectClass *klass, void *data)
 395 {
 396     DeviceClass *dc = DEVICE_CLASS(klass);
 397     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 398
 399     k->init = s390_virtio_serial_init;
 400     dc->props = s390_virtio_serial_properties;
 401 }
 402
 403 static TypeInfo s390_virtio_serial = {
 404     .name          = "virtio-serial-s390",
 405     .parent        = TYPE_VIRTIO_S390_DEVICE,
 406     .instance_size = sizeof(VirtIOS390Device),
 407     .class_init    = s390_virtio_serial_class_init,
 408 };
 409
 410 static int s390_virtio_busdev_init(DeviceState *dev)
 411 {
 412     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 413     VirtIOS390DeviceClass *_info = VIRTIO_S390_DEVICE_GET_CLASS(dev);
 414
 415     return _info->init(_dev);
 416 }
 417
 418 static void virtio_s390_device_class_init(ObjectClass *klass, void *data)
 419 {
 420     DeviceClass *dc = DEVICE_CLASS(klass);
 421
 422     dc->init = s390_virtio_busdev_init;
 423     dc->bus_info = &s390_virtio_bus_info;
 424     dc->unplug = qdev_simple_unplug_cb;
 425 }
 426
 427 static TypeInfo virtio_s390_device_info = {
 428     .name = TYPE_VIRTIO_S390_DEVICE,
 429     .parent = TYPE_DEVICE,
 430     .instance_size = sizeof(VirtIOS390Device),
 431     .class_init = virtio_s390_device_class_init,
 432     .abstract = true,
 433 };
 434
 435 static void s390_virtio_register(void)
 436 {
 437     type_register_static(&virtio_s390_device_info);
 438     type_register_static(&s390_virtio_serial);
 439     type_register_static(&s390_virtio_blk);
 440     type_register_static(&s390_virtio_net);
 441 }
 442 device_init(s390_virtio_register);
 443
 444
 445 /***************** S390 Virtio Bus Bridge Device *******************/
 446 /* Only required to have the virtio bus as child in the system bus */
 447
 448 static int s390_virtio_bridge_init(SysBusDevice *dev)
 449 {
 450     /* nothing */
 451     return 0;
 452 }
 453
 454 static void s390_virtio_bridge_class_init(ObjectClass *klass, void *data)
 455 {
 456     DeviceClass *dc = DEVICE_CLASS(klass);
 457     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 458
 459     k->init = s390_virtio_bridge_init;
 460     dc->no_user = 1;
 461 }
 462
 463 static TypeInfo s390_virtio_bridge_info = {
 464     .name          = "s390-virtio-bridge",
 465     .parent        = TYPE_SYS_BUS_DEVICE,
 466     .instance_size = sizeof(SysBusDevice),
 467     .class_init    = s390_virtio_bridge_class_init,
 468 };
 469
 470 static void s390_virtio_register_devices(void)
 471 {
 472     type_register_static(&s390_virtio_bridge_info);
 473 }
 474
 475 device_init(s390_virtio_register_devices)