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-console.h"
  30 #include "hw/sysbus.h"
  31 #include "kvm.h"
  32
  33 #include "hw/s390-virtio-bus.h"
  34
  35 /* #define DEBUG_S390 */
  36
  37 #ifdef DEBUG_S390
  38 #define dprintf(fmt, ...) \
  39     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  40 #else
  41 #define dprintf(fmt, ...) \
  42     do { } while (0)
  43 #endif
  44
  45 struct BusInfo s390_virtio_bus_info = {
  46     .name       = "s390-virtio",
  47     .size       = sizeof(VirtIOS390Bus),
  48 };
  49
  50 typedef struct {
  51     DeviceInfo qdev;
  52     int (*init)(VirtIOS390Device *dev);
  53 } VirtIOS390DeviceInfo;
  54
  55
  56 static const VirtIOBindings virtio_s390_bindings;
  57
  58 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev);
  59 static void s390_virtio_device_sync(VirtIOS390Device *dev);
  60
  61 VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size)
  62 {
  63     VirtIOS390Bus *bus;
  64     BusState *_bus;
  65     DeviceState *dev;
  66
  67     /* Create bridge device */
  68     dev = qdev_create(NULL, "s390-virtio-bridge");
  69     qdev_init_nofail(dev);
  70
  71     /* Create bus on bridge device */
  72
  73     _bus = qbus_create(&s390_virtio_bus_info, dev, "s390-virtio");
  74     bus = DO_UPCAST(VirtIOS390Bus, bus, _bus);
  75
  76     bus->dev_page = *ram_size;
  77     bus->dev_offs = bus->dev_page;
  78     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
  79
  80     /* Allocate RAM for VirtIO device pages (descriptors, queues, rings) */
  81     *ram_size += S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
  82
  83     return bus;
  84 }
  85
  86 static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
  87 {
  88     VirtIOS390Bus *bus;
  89     int dev_len;
  90
  91     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
  92     dev->vdev = vdev;
  93     dev->dev_offs = bus->dev_offs;
  94     dev->feat_len = sizeof(uint32_t); /* always keep 32 bits features */
  95
  96     dev_len = VIRTIO_DEV_OFFS_CONFIG;
  97     dev_len += s390_virtio_device_num_vq(dev) * VIRTIO_VQCONFIG_LEN;
  98     dev_len += dev->feat_len * 2;
  99     dev_len += vdev->config_len;
 100
 101     bus->dev_offs += dev_len;
 102
 103     virtio_bind_device(vdev, &virtio_s390_bindings, dev);
 104     dev->host_features = vdev->get_features(vdev, dev->host_features);
 105     s390_virtio_device_sync(dev);
 106
 107     return 0;
 108 }
 109
 110 static int s390_virtio_net_init(VirtIOS390Device *dev)
 111 {
 112     VirtIODevice *vdev;
 113
 114     vdev = virtio_net_init((DeviceState *)dev, &dev->nic);
 115     if (!vdev) {
 116         return -1;
 117     }
 118
 119     return s390_virtio_device_init(dev, vdev);
 120 }
 121
 122 static int s390_virtio_blk_init(VirtIOS390Device *dev)
 123 {
 124     VirtIODevice *vdev;
 125
 126     vdev = virtio_blk_init((DeviceState *)dev, dev->dinfo);
 127     if (!vdev) {
 128         return -1;
 129     }
 130
 131     return s390_virtio_device_init(dev, vdev);
 132 }
 133
 134 static int s390_virtio_console_init(VirtIOS390Device *dev)
 135 {
 136     VirtIOS390Bus *bus;
 137     VirtIODevice *vdev;
 138     int r;
 139
 140     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 141
 142     vdev = virtio_console_init((DeviceState *)dev);
 143     if (!vdev) {
 144         return -1;
 145     }
 146
 147     r = s390_virtio_device_init(dev, vdev);
 148     if (!r) {
 149         bus->console = dev;
 150     }
 151
 152     return r;
 153 }
 154
 155 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 156 {
 157     ram_addr_t token_off;
 158
 159     token_off = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 160                 (vq * VIRTIO_VQCONFIG_LEN) +
 161                 VIRTIO_VQCONFIG_OFFS_TOKEN;
 162
 163     return ldq_phys(token_off);
 164 }
 165
 166 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev)
 167 {
 168     VirtIODevice *vdev = dev->vdev;
 169     int num_vq;
 170
 171     for (num_vq = 0; num_vq < VIRTIO_PCI_QUEUE_MAX; num_vq++) {
 172         if (!virtio_queue_get_num(vdev, num_vq)) {
 173             break;
 174         }
 175     }
 176
 177     return num_vq;
 178 }
 179
 180 static ram_addr_t s390_virtio_next_ring(VirtIOS390Bus *bus)
 181 {
 182     ram_addr_t r = bus->next_ring;
 183
 184     bus->next_ring += VIRTIO_RING_LEN;
 185     return r;
 186 }
 187
 188 static void s390_virtio_device_sync(VirtIOS390Device *dev)
 189 {
 190     VirtIOS390Bus *bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 191     ram_addr_t cur_offs;
 192     uint8_t num_vq;
 193     int i;
 194
 195     virtio_reset(dev->vdev);
 196
 197     /* Sync dev space */
 198     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_TYPE, dev->vdev->device_id);
 199
 200     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, s390_virtio_device_num_vq(dev));
 201     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_FEATURE_LEN, dev->feat_len);
 202
 203     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG_LEN, dev->vdev->config_len);
 204
 205     num_vq = s390_virtio_device_num_vq(dev);
 206     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, num_vq);
 207
 208     /* Sync virtqueues */
 209     for (i = 0; i < num_vq; i++) {
 210         ram_addr_t vq = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 211                         (i * VIRTIO_VQCONFIG_LEN);
 212         ram_addr_t vring;
 213
 214         vring = s390_virtio_next_ring(bus);
 215         virtio_queue_set_addr(dev->vdev, i, vring);
 216         virtio_queue_set_vector(dev->vdev, i, i);
 217         stq_phys(vq + VIRTIO_VQCONFIG_OFFS_ADDRESS, vring);
 218         stw_phys(vq + VIRTIO_VQCONFIG_OFFS_NUM, virtio_queue_get_num(dev->vdev, i));
 219     }
 220
 221     cur_offs = dev->dev_offs;
 222     cur_offs += VIRTIO_DEV_OFFS_CONFIG;
 223     cur_offs += num_vq * VIRTIO_VQCONFIG_LEN;
 224
 225     /* Sync feature bitmap */
 226     stl_phys(cur_offs, dev->host_features);
 227
 228     dev->feat_offs = cur_offs + dev->feat_len;
 229     cur_offs += dev->feat_len * 2;
 230
 231     /* Sync config space */
 232     if (dev->vdev->get_config) {
 233         dev->vdev->get_config(dev->vdev, dev->vdev->config);
 234     }
 235
 236     cpu_physical_memory_rw(cur_offs, dev->vdev->config, dev->vdev->config_len, 1);
 237     cur_offs += dev->vdev->config_len;
 238 }
 239
 240 void s390_virtio_device_update_status(VirtIOS390Device *dev)
 241 {
 242     VirtIODevice *vdev = dev->vdev;
 243     uint32_t features;
 244
 245     vdev->status = ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS);
 246
 247     /* Update guest supported feature bitmap */
 248
 249     features = ldl_phys(dev->feat_offs);
 250     if (vdev->set_features) {
 251         vdev->set_features(vdev, features);
 252     }
 253     vdev->guest_features = features;
 254 }
 255
 256 VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)
 257 {
 258     return bus->console;
 259 }
 260
 261 /* Find a device by vring address */
 262 VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus,
 263                                              ram_addr_t mem,
 264                                              int *vq_num)
 265 {
 266     VirtIOS390Device *_dev;
 267     DeviceState *dev;
 268     int i;
 269
 270     QLIST_FOREACH(dev, &bus->bus.children, sibling) {
 271         _dev = (VirtIOS390Device *)dev;
 272         for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
 273             if (!virtio_queue_get_addr(_dev->vdev, i))
 274                 break;
 275             if (virtio_queue_get_addr(_dev->vdev, i) == mem) {
 276                 if (vq_num) {
 277                     *vq_num = i;
 278                 }
 279                 return _dev;
 280             }
 281         }
 282     }
 283
 284     return NULL;
 285 }
 286
 287 /* Find a device by device descriptor location */
 288 VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
 289 {
 290     VirtIOS390Device *_dev;
 291     DeviceState *dev;
 292
 293     QLIST_FOREACH(dev, &bus->bus.children, sibling) {
 294         _dev = (VirtIOS390Device *)dev;
 295         if (_dev->dev_offs == mem) {
 296             return _dev;
 297         }
 298     }
 299
 300     return NULL;
 301 }
 302
 303 static void virtio_s390_notify(void *opaque, uint16_t vector)
 304 {
 305     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 306     uint64_t token = s390_virtio_device_vq_token(dev, vector);
 307
 308     /* XXX kvm dependency! */
 309     kvm_s390_virtio_irq(s390_cpu_addr2state(0), 0, token);
 310 }
 311
 312 static unsigned virtio_s390_get_features(void *opaque)
 313 {
 314     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 315     return dev->host_features;
 316 }
 317
 318 /**************** S390 Virtio Bus Device Descriptions *******************/
 319
 320 static const VirtIOBindings virtio_s390_bindings = {
 321     .notify = virtio_s390_notify,
 322     .get_features = virtio_s390_get_features,
 323 };
 324
 325 static VirtIOS390DeviceInfo s390_virtio_net = {
 326     .init = s390_virtio_net_init,
 327     .qdev.name = "virtio-net-s390",
 328     .qdev.size = sizeof(VirtIOS390Device),
 329     .qdev.props = (Property[]) {
 330         DEFINE_NIC_PROPERTIES(VirtIOS390Device, nic),
 331         DEFINE_PROP_END_OF_LIST(),
 332     },
 333 };
 334
 335 static VirtIOS390DeviceInfo s390_virtio_blk = {
 336     .init = s390_virtio_blk_init,
 337     .qdev.name = "virtio-blk-s390",
 338     .qdev.size = sizeof(VirtIOS390Device),
 339     .qdev.props = (Property[]) {
 340         DEFINE_PROP_DRIVE("drive", VirtIOS390Device, dinfo),
 341         DEFINE_PROP_END_OF_LIST(),
 342     },
 343 };
 344
 345 static VirtIOS390DeviceInfo s390_virtio_console = {
 346     .init = s390_virtio_console_init,
 347     .qdev.name = "virtio-console-s390",
 348     .qdev.size = sizeof(VirtIOS390Device),
 349     .qdev.props = (Property[]) {
 350         DEFINE_PROP_END_OF_LIST(),
 351     },
 352 };
 353
 354 static int s390_virtio_busdev_init(DeviceState *dev, DeviceInfo *info)
 355 {
 356     VirtIOS390DeviceInfo *_info = (VirtIOS390DeviceInfo *)info;
 357     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 358
 359     return _info->init(_dev);
 360 }
 361
 362 static void s390_virtio_bus_register_withprop(VirtIOS390DeviceInfo *info)
 363 {
 364     info->qdev.init = s390_virtio_busdev_init;
 365     info->qdev.bus_info = &s390_virtio_bus_info;
 366
 367     assert(info->qdev.size >= sizeof(VirtIOS390Device));
 368     qdev_register(&info->qdev);
 369 }
 370
 371 static void s390_virtio_register(void)
 372 {
 373     s390_virtio_bus_register_withprop(&s390_virtio_console);
 374     s390_virtio_bus_register_withprop(&s390_virtio_blk);
 375     s390_virtio_bus_register_withprop(&s390_virtio_net);
 376 }
 377 device_init(s390_virtio_register);
 378
 379
 380 /***************** S390 Virtio Bus Bridge Device *******************/
 381 /* Only required to have the virtio bus as child in the system bus */
 382
 383 static int s390_virtio_bridge_init(SysBusDevice *dev)
 384 {
 385     /* nothing */
 386     return 0;
 387 }
 388
 389 static SysBusDeviceInfo s390_virtio_bridge_info = {
 390     .init = s390_virtio_bridge_init,
 391     .qdev.name  = "s390-virtio-bridge",
 392     .qdev.size  = sizeof(SysBusDevice),
 393     .qdev.no_user = 1,
 394 };
 395
 396 static void s390_virtio_register_devices(void)
 397 {
 398     sysbus_register_withprop(&s390_virtio_bridge_info);
 399 }
 400
 401 device_init(s390_virtio_register_devices)