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 typedef struct {
  54     DeviceInfo qdev;
  55     int (*init)(VirtIOS390Device *dev);
  56 } VirtIOS390DeviceInfo;
  57
  58
  59 static const VirtIOBindings virtio_s390_bindings;
  60
  61 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev);
  62
  63 /* length of VirtIO device pages */
  64 const target_phys_addr_t virtio_size = S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
  65
  66 VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size)
  67 {
  68     VirtIOS390Bus *bus;
  69     BusState *_bus;
  70     DeviceState *dev;
  71
  72     /* Create bridge device */
  73     dev = qdev_create(NULL, "s390-virtio-bridge");
  74     qdev_init_nofail(dev);
  75
  76     /* Create bus on bridge device */
  77
  78     _bus = qbus_create(&s390_virtio_bus_info, dev, "s390-virtio");
  79     bus = DO_UPCAST(VirtIOS390Bus, bus, _bus);
  80
  81     bus->dev_page = *ram_size;
  82     bus->dev_offs = bus->dev_page;
  83     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
  84
  85     /* Allocate RAM for VirtIO device pages (descriptors, queues, rings) */
  86     *ram_size += S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
  87
  88     return bus;
  89 }
  90
  91 static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
  92 {
  93     VirtIOS390Bus *bus;
  94     int dev_len;
  95
  96     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
  97     dev->vdev = vdev;
  98     dev->dev_offs = bus->dev_offs;
  99     dev->feat_len = sizeof(uint32_t); /* always keep 32 bits features */
 100
 101     dev_len = VIRTIO_DEV_OFFS_CONFIG;
 102     dev_len += s390_virtio_device_num_vq(dev) * VIRTIO_VQCONFIG_LEN;
 103     dev_len += dev->feat_len * 2;
 104     dev_len += vdev->config_len;
 105
 106     bus->dev_offs += dev_len;
 107
 108     virtio_bind_device(vdev, &virtio_s390_bindings, dev);
 109     dev->host_features = vdev->get_features(vdev, dev->host_features);
 110     s390_virtio_device_sync(dev);
 111
 112     return 0;
 113 }
 114
 115 static int s390_virtio_net_init(VirtIOS390Device *dev)
 116 {
 117     VirtIODevice *vdev;
 118
 119     vdev = virtio_net_init((DeviceState *)dev, &dev->nic, &dev->net);
 120     if (!vdev) {
 121         return -1;
 122     }
 123
 124     return s390_virtio_device_init(dev, vdev);
 125 }
 126
 127 static int s390_virtio_blk_init(VirtIOS390Device *dev)
 128 {
 129     VirtIODevice *vdev;
 130
 131     vdev = virtio_blk_init((DeviceState *)dev, &dev->block,
 132                            &dev->block_serial);
 133     if (!vdev) {
 134         return -1;
 135     }
 136
 137     return s390_virtio_device_init(dev, vdev);
 138 }
 139
 140 static int s390_virtio_serial_init(VirtIOS390Device *dev)
 141 {
 142     VirtIOS390Bus *bus;
 143     VirtIODevice *vdev;
 144     int r;
 145
 146     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 147
 148     vdev = virtio_serial_init((DeviceState *)dev, &dev->serial);
 149     if (!vdev) {
 150         return -1;
 151     }
 152
 153     r = s390_virtio_device_init(dev, vdev);
 154     if (!r) {
 155         bus->console = dev;
 156     }
 157
 158     return r;
 159 }
 160
 161 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 162 {
 163     ram_addr_t token_off;
 164
 165     token_off = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 166                 (vq * VIRTIO_VQCONFIG_LEN) +
 167                 VIRTIO_VQCONFIG_OFFS_TOKEN;
 168
 169     return ldq_be_phys(token_off);
 170 }
 171
 172 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev)
 173 {
 174     VirtIODevice *vdev = dev->vdev;
 175     int num_vq;
 176
 177     for (num_vq = 0; num_vq < VIRTIO_PCI_QUEUE_MAX; num_vq++) {
 178         if (!virtio_queue_get_num(vdev, num_vq)) {
 179             break;
 180         }
 181     }
 182
 183     return num_vq;
 184 }
 185
 186 static ram_addr_t s390_virtio_next_ring(VirtIOS390Bus *bus)
 187 {
 188     ram_addr_t r = bus->next_ring;
 189
 190     bus->next_ring += VIRTIO_RING_LEN;
 191     return r;
 192 }
 193
 194 void s390_virtio_device_sync(VirtIOS390Device *dev)
 195 {
 196     VirtIOS390Bus *bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 197     ram_addr_t cur_offs;
 198     uint8_t num_vq;
 199     int i;
 200
 201     virtio_reset(dev->vdev);
 202
 203     /* Sync dev space */
 204     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_TYPE, dev->vdev->device_id);
 205
 206     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, s390_virtio_device_num_vq(dev));
 207     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_FEATURE_LEN, dev->feat_len);
 208
 209     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG_LEN, dev->vdev->config_len);
 210
 211     num_vq = s390_virtio_device_num_vq(dev);
 212     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, num_vq);
 213
 214     /* Sync virtqueues */
 215     for (i = 0; i < num_vq; i++) {
 216         ram_addr_t vq = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 217                         (i * VIRTIO_VQCONFIG_LEN);
 218         ram_addr_t vring;
 219
 220         vring = s390_virtio_next_ring(bus);
 221         virtio_queue_set_addr(dev->vdev, i, vring);
 222         virtio_queue_set_vector(dev->vdev, i, i);
 223         stq_be_phys(vq + VIRTIO_VQCONFIG_OFFS_ADDRESS, vring);
 224         stw_be_phys(vq + VIRTIO_VQCONFIG_OFFS_NUM, virtio_queue_get_num(dev->vdev, i));
 225     }
 226
 227     cur_offs = dev->dev_offs;
 228     cur_offs += VIRTIO_DEV_OFFS_CONFIG;
 229     cur_offs += num_vq * VIRTIO_VQCONFIG_LEN;
 230
 231     /* Sync feature bitmap */
 232     stl_le_phys(cur_offs, dev->host_features);
 233
 234     dev->feat_offs = cur_offs + dev->feat_len;
 235     cur_offs += dev->feat_len * 2;
 236
 237     /* Sync config space */
 238     if (dev->vdev->get_config) {
 239         dev->vdev->get_config(dev->vdev, dev->vdev->config);
 240     }
 241
 242     cpu_physical_memory_write(cur_offs,
 243                               dev->vdev->config, dev->vdev->config_len);
 244     cur_offs += dev->vdev->config_len;
 245 }
 246
 247 void s390_virtio_device_update_status(VirtIOS390Device *dev)
 248 {
 249     VirtIODevice *vdev = dev->vdev;
 250     uint32_t features;
 251
 252     virtio_set_status(vdev, ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS));
 253
 254     /* Update guest supported feature bitmap */
 255
 256     features = bswap32(ldl_be_phys(dev->feat_offs));
 257     if (vdev->set_features) {
 258         vdev->set_features(vdev, features);
 259     }
 260     vdev->guest_features = features;
 261 }
 262
 263 VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)
 264 {
 265     return bus->console;
 266 }
 267
 268 /* Find a device by vring address */
 269 VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus,
 270                                              ram_addr_t mem,
 271                                              int *vq_num)
 272 {
 273     VirtIOS390Device *_dev;
 274     DeviceState *dev;
 275     int i;
 276
 277     QLIST_FOREACH(dev, &bus->bus.children, sibling) {
 278         _dev = (VirtIOS390Device *)dev;
 279         for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
 280             if (!virtio_queue_get_addr(_dev->vdev, i))
 281                 break;
 282             if (virtio_queue_get_addr(_dev->vdev, i) == mem) {
 283                 if (vq_num) {
 284                     *vq_num = i;
 285                 }
 286                 return _dev;
 287             }
 288         }
 289     }
 290
 291     return NULL;
 292 }
 293
 294 /* Find a device by device descriptor location */
 295 VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
 296 {
 297     VirtIOS390Device *_dev;
 298     DeviceState *dev;
 299
 300     QLIST_FOREACH(dev, &bus->bus.children, sibling) {
 301         _dev = (VirtIOS390Device *)dev;
 302         if (_dev->dev_offs == mem) {
 303             return _dev;
 304         }
 305     }
 306
 307     return NULL;
 308 }
 309
 310 static void virtio_s390_notify(void *opaque, uint16_t vector)
 311 {
 312     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 313     uint64_t token = s390_virtio_device_vq_token(dev, vector);
 314     CPUState *env = s390_cpu_addr2state(0);
 315
 316     if (kvm_enabled()) {
 317         kvm_s390_virtio_irq(env, 0, token);
 318     } else {
 319         cpu_inject_ext(env, VIRTIO_EXT_CODE, 0, token);
 320     }
 321 }
 322
 323 static unsigned virtio_s390_get_features(void *opaque)
 324 {
 325     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 326     return dev->host_features;
 327 }
 328
 329 /**************** S390 Virtio Bus Device Descriptions *******************/
 330
 331 static const VirtIOBindings virtio_s390_bindings = {
 332     .notify = virtio_s390_notify,
 333     .get_features = virtio_s390_get_features,
 334 };
 335
 336 static VirtIOS390DeviceInfo s390_virtio_net = {
 337     .init = s390_virtio_net_init,
 338     .qdev.name = "virtio-net-s390",
 339     .qdev.alias = "virtio-net",
 340     .qdev.size = sizeof(VirtIOS390Device),
 341     .qdev.props = (Property[]) {
 342         DEFINE_NIC_PROPERTIES(VirtIOS390Device, nic),
 343         DEFINE_PROP_UINT32("x-txtimer", VirtIOS390Device,
 344                            net.txtimer, TX_TIMER_INTERVAL),
 345         DEFINE_PROP_INT32("x-txburst", VirtIOS390Device,
 346                           net.txburst, TX_BURST),
 347         DEFINE_PROP_STRING("tx", VirtIOS390Device, net.tx),
 348         DEFINE_PROP_END_OF_LIST(),
 349     },
 350 };
 351
 352 static VirtIOS390DeviceInfo s390_virtio_blk = {
 353     .init = s390_virtio_blk_init,
 354     .qdev.name = "virtio-blk-s390",
 355     .qdev.alias = "virtio-blk",
 356     .qdev.size = sizeof(VirtIOS390Device),
 357     .qdev.props = (Property[]) {
 358         DEFINE_BLOCK_PROPERTIES(VirtIOS390Device, block),
 359         DEFINE_PROP_STRING("serial", VirtIOS390Device, block_serial),
 360         DEFINE_PROP_END_OF_LIST(),
 361     },
 362 };
 363
 364 static VirtIOS390DeviceInfo s390_virtio_serial = {
 365     .init = s390_virtio_serial_init,
 366     .qdev.name = "virtio-serial-s390",
 367     .qdev.alias = "virtio-serial",
 368     .qdev.size = sizeof(VirtIOS390Device),
 369     .qdev.props = (Property[]) {
 370         DEFINE_PROP_UINT32("max_ports", VirtIOS390Device,
 371                            serial.max_virtserial_ports, 31),
 372         DEFINE_PROP_END_OF_LIST(),
 373     },
 374 };
 375
 376 static int s390_virtio_busdev_init(DeviceState *dev, DeviceInfo *info)
 377 {
 378     VirtIOS390DeviceInfo *_info = (VirtIOS390DeviceInfo *)info;
 379     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 380
 381     return _info->init(_dev);
 382 }
 383
 384 static void s390_virtio_bus_register_withprop(VirtIOS390DeviceInfo *info)
 385 {
 386     info->qdev.init = s390_virtio_busdev_init;
 387     info->qdev.bus_info = &s390_virtio_bus_info;
 388
 389     assert(info->qdev.size >= sizeof(VirtIOS390Device));
 390     qdev_register(&info->qdev);
 391 }
 392
 393 static void s390_virtio_register(void)
 394 {
 395     s390_virtio_bus_register_withprop(&s390_virtio_serial);
 396     s390_virtio_bus_register_withprop(&s390_virtio_blk);
 397     s390_virtio_bus_register_withprop(&s390_virtio_net);
 398 }
 399 device_init(s390_virtio_register);
 400
 401
 402 /***************** S390 Virtio Bus Bridge Device *******************/
 403 /* Only required to have the virtio bus as child in the system bus */
 404
 405 static int s390_virtio_bridge_init(SysBusDevice *dev)
 406 {
 407     /* nothing */
 408     return 0;
 409 }
 410
 411 static SysBusDeviceInfo s390_virtio_bridge_info = {
 412     .init = s390_virtio_bridge_init,
 413     .qdev.name  = "s390-virtio-bridge",
 414     .qdev.size  = sizeof(SysBusDevice),
 415     .qdev.no_user = 1,
 416 };
 417
 418 static void s390_virtio_register_devices(void)
 419 {
 420     sysbus_register_withprop(&s390_virtio_bridge_info);
 421 }
 422
 423 device_init(s390_virtio_register_devices)