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