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     if (!vdev) {
 133         return -1;
 134     }
 135
 136     return s390_virtio_device_init(dev, vdev);
 137 }
 138
 139 static int s390_virtio_serial_init(VirtIOS390Device *dev)
 140 {
 141     VirtIOS390Bus *bus;
 142     VirtIODevice *vdev;
 143     int r;
 144
 145     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 146
 147     vdev = virtio_serial_init((DeviceState *)dev, &dev->serial);
 148     if (!vdev) {
 149         return -1;
 150     }
 151
 152     r = s390_virtio_device_init(dev, vdev);
 153     if (!r) {
 154         bus->console = dev;
 155     }
 156
 157     return r;
 158 }
 159
 160 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 161 {
 162     ram_addr_t token_off;
 163
 164     token_off = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 165                 (vq * VIRTIO_VQCONFIG_LEN) +
 166                 VIRTIO_VQCONFIG_OFFS_TOKEN;
 167
 168     return ldq_phys(token_off);
 169 }
 170
 171 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev)
 172 {
 173     VirtIODevice *vdev = dev->vdev;
 174     int num_vq;
 175
 176     for (num_vq = 0; num_vq < VIRTIO_PCI_QUEUE_MAX; num_vq++) {
 177         if (!virtio_queue_get_num(vdev, num_vq)) {
 178             break;
 179         }
 180     }
 181
 182     return num_vq;
 183 }
 184
 185 static ram_addr_t s390_virtio_next_ring(VirtIOS390Bus *bus)
 186 {
 187     ram_addr_t r = bus->next_ring;
 188
 189     bus->next_ring += VIRTIO_RING_LEN;
 190     return r;
 191 }
 192
 193 void s390_virtio_device_sync(VirtIOS390Device *dev)
 194 {
 195     VirtIOS390Bus *bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 196     ram_addr_t cur_offs;
 197     uint8_t num_vq;
 198     int i;
 199
 200     virtio_reset(dev->vdev);
 201
 202     /* Sync dev space */
 203     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_TYPE, dev->vdev->device_id);
 204
 205     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, s390_virtio_device_num_vq(dev));
 206     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_FEATURE_LEN, dev->feat_len);
 207
 208     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG_LEN, dev->vdev->config_len);
 209
 210     num_vq = s390_virtio_device_num_vq(dev);
 211     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, num_vq);
 212
 213     /* Sync virtqueues */
 214     for (i = 0; i < num_vq; i++) {
 215         ram_addr_t vq = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 216                         (i * VIRTIO_VQCONFIG_LEN);
 217         ram_addr_t vring;
 218
 219         vring = s390_virtio_next_ring(bus);
 220         virtio_queue_set_addr(dev->vdev, i, vring);
 221         virtio_queue_set_vector(dev->vdev, i, i);
 222         stq_phys(vq + VIRTIO_VQCONFIG_OFFS_ADDRESS, vring);
 223         stw_phys(vq + VIRTIO_VQCONFIG_OFFS_NUM, virtio_queue_get_num(dev->vdev, i));
 224     }
 225
 226     cur_offs = dev->dev_offs;
 227     cur_offs += VIRTIO_DEV_OFFS_CONFIG;
 228     cur_offs += num_vq * VIRTIO_VQCONFIG_LEN;
 229
 230     /* Sync feature bitmap */
 231     stl_phys(cur_offs, bswap32(dev->host_features));
 232
 233     dev->feat_offs = cur_offs + dev->feat_len;
 234     cur_offs += dev->feat_len * 2;
 235
 236     /* Sync config space */
 237     if (dev->vdev->get_config) {
 238         dev->vdev->get_config(dev->vdev, dev->vdev->config);
 239     }
 240
 241     cpu_physical_memory_write(cur_offs,
 242                               dev->vdev->config, dev->vdev->config_len);
 243     cur_offs += dev->vdev->config_len;
 244 }
 245
 246 void s390_virtio_device_update_status(VirtIOS390Device *dev)
 247 {
 248     VirtIODevice *vdev = dev->vdev;
 249     uint32_t features;
 250
 251     virtio_set_status(vdev, ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS));
 252
 253     /* Update guest supported feature bitmap */
 254
 255     features = bswap32(ldl_phys(dev->feat_offs));
 256     if (vdev->set_features) {
 257         vdev->set_features(vdev, features);
 258     }
 259     vdev->guest_features = features;
 260 }
 261
 262 VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)
 263 {
 264     return bus->console;
 265 }
 266
 267 /* Find a device by vring address */
 268 VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus,
 269                                              ram_addr_t mem,
 270                                              int *vq_num)
 271 {
 272     VirtIOS390Device *_dev;
 273     DeviceState *dev;
 274     int i;
 275
 276     QLIST_FOREACH(dev, &bus->bus.children, sibling) {
 277         _dev = (VirtIOS390Device *)dev;
 278         for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
 279             if (!virtio_queue_get_addr(_dev->vdev, i))
 280                 break;
 281             if (virtio_queue_get_addr(_dev->vdev, i) == mem) {
 282                 if (vq_num) {
 283                     *vq_num = i;
 284                 }
 285                 return _dev;
 286             }
 287         }
 288     }
 289
 290     return NULL;
 291 }
 292
 293 /* Find a device by device descriptor location */
 294 VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
 295 {
 296     VirtIOS390Device *_dev;
 297     DeviceState *dev;
 298
 299     QLIST_FOREACH(dev, &bus->bus.children, sibling) {
 300         _dev = (VirtIOS390Device *)dev;
 301         if (_dev->dev_offs == mem) {
 302             return _dev;
 303         }
 304     }
 305
 306     return NULL;
 307 }
 308
 309 static void virtio_s390_notify(void *opaque, uint16_t vector)
 310 {
 311     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 312     uint64_t token = s390_virtio_device_vq_token(dev, vector);
 313     CPUState *env = s390_cpu_addr2state(0);
 314
 315     if (kvm_enabled()) {
 316         kvm_s390_virtio_irq(env, 0, token);
 317     } else {
 318         cpu_inject_ext(env, VIRTIO_EXT_CODE, 0, token);
 319     }
 320 }
 321
 322 static unsigned virtio_s390_get_features(void *opaque)
 323 {
 324     VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
 325     return dev->host_features;
 326 }
 327
 328 /**************** S390 Virtio Bus Device Descriptions *******************/
 329
 330 static const VirtIOBindings virtio_s390_bindings = {
 331     .notify = virtio_s390_notify,
 332     .get_features = virtio_s390_get_features,
 333 };
 334
 335 static VirtIOS390DeviceInfo s390_virtio_net = {
 336     .init = s390_virtio_net_init,
 337     .qdev.name = "virtio-net-s390",
 338     .qdev.alias = "virtio-net",
 339     .qdev.size = sizeof(VirtIOS390Device),
 340     .qdev.props = (Property[]) {
 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
 351 static VirtIOS390DeviceInfo s390_virtio_blk = {
 352     .init = s390_virtio_blk_init,
 353     .qdev.name = "virtio-blk-s390",
 354     .qdev.alias = "virtio-blk",
 355     .qdev.size = sizeof(VirtIOS390Device),
 356     .qdev.props = (Property[]) {
 357         DEFINE_BLOCK_PROPERTIES(VirtIOS390Device, block),
 358         DEFINE_PROP_END_OF_LIST(),
 359     },
 360 };
 361
 362 static VirtIOS390DeviceInfo s390_virtio_serial = {
 363     .init = s390_virtio_serial_init,
 364     .qdev.name = "virtio-serial-s390",
 365     .qdev.alias = "virtio-serial",
 366     .qdev.size = sizeof(VirtIOS390Device),
 367     .qdev.props = (Property[]) {
 368         DEFINE_PROP_UINT32("max_ports", VirtIOS390Device,
 369                            serial.max_virtserial_ports, 31),
 370         DEFINE_PROP_END_OF_LIST(),
 371     },
 372 };
 373
 374 static int s390_virtio_busdev_init(DeviceState *dev, DeviceInfo *info)
 375 {
 376     VirtIOS390DeviceInfo *_info = (VirtIOS390DeviceInfo *)info;
 377     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 378
 379     return _info->init(_dev);
 380 }
 381
 382 static void s390_virtio_bus_register_withprop(VirtIOS390DeviceInfo *info)
 383 {
 384     info->qdev.init = s390_virtio_busdev_init;
 385     info->qdev.bus_info = &s390_virtio_bus_info;
 386
 387     assert(info->qdev.size >= sizeof(VirtIOS390Device));
 388     qdev_register(&info->qdev);
 389 }
 390
 391 static void s390_virtio_register(void)
 392 {
 393     s390_virtio_bus_register_withprop(&s390_virtio_serial);
 394     s390_virtio_bus_register_withprop(&s390_virtio_blk);
 395     s390_virtio_bus_register_withprop(&s390_virtio_net);
 396 }
 397 device_init(s390_virtio_register);
 398
 399
 400 /***************** S390 Virtio Bus Bridge Device *******************/
 401 /* Only required to have the virtio bus as child in the system bus */
 402
 403 static int s390_virtio_bridge_init(SysBusDevice *dev)
 404 {
 405     /* nothing */
 406     return 0;
 407 }
 408
 409 static SysBusDeviceInfo s390_virtio_bridge_info = {
 410     .init = s390_virtio_bridge_init,
 411     .qdev.name  = "s390-virtio-bridge",
 412     .qdev.size  = sizeof(SysBusDevice),
 413     .qdev.no_user = 1,
 414 };
 415
 416 static void s390_virtio_register_devices(void)
 417 {
 418     sysbus_register_withprop(&s390_virtio_bridge_info);
 419 }
 420
 421 device_init(s390_virtio_register_devices)