1 /* 2 * virtio ccw target implementation 3 * 4 * Copyright 2012,2015 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * Pierre Morel <pmorel@linux.vnet.ibm.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2 or (at 9 * your option) any later version. See the COPYING file in the top-level 10 * directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "qapi/error.h" 15 #include "sysemu/kvm.h" 16 #include "net/net.h" 17 #include "hw/virtio/virtio.h" 18 #include "migration/qemu-file-types.h" 19 #include "hw/virtio/virtio-net.h" 20 #include "hw/sysbus.h" 21 #include "qemu/bitops.h" 22 #include "qemu/error-report.h" 23 #include "qemu/module.h" 24 #include "hw/virtio/virtio-access.h" 25 #include "hw/virtio/virtio-bus.h" 26 #include "hw/s390x/adapter.h" 27 #include "hw/s390x/s390_flic.h" 28 29 #include "hw/s390x/ioinst.h" 30 #include "hw/s390x/css.h" 31 #include "virtio-ccw.h" 32 #include "trace.h" 33 #include "hw/s390x/css-bridge.h" 34 #include "hw/s390x/s390-virtio-ccw.h" 35 36 #define NR_CLASSIC_INDICATOR_BITS 64 37 38 static int virtio_ccw_dev_post_load(void *opaque, int version_id) 39 { 40 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); 41 CcwDevice *ccw_dev = CCW_DEVICE(dev); 42 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 43 44 ccw_dev->sch->driver_data = dev; 45 if (ccw_dev->sch->thinint_active) { 46 dev->routes.adapter.adapter_id = css_get_adapter_id( 47 CSS_IO_ADAPTER_VIRTIO, 48 dev->thinint_isc); 49 } 50 /* Re-fill subch_id after loading the subchannel states.*/ 51 if (ck->refill_ids) { 52 ck->refill_ids(ccw_dev); 53 } 54 return 0; 55 } 56 57 typedef struct VirtioCcwDeviceTmp { 58 VirtioCcwDevice *parent; 59 uint16_t config_vector; 60 } VirtioCcwDeviceTmp; 61 62 static int virtio_ccw_dev_tmp_pre_save(void *opaque) 63 { 64 VirtioCcwDeviceTmp *tmp = opaque; 65 VirtioCcwDevice *dev = tmp->parent; 66 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 67 68 tmp->config_vector = vdev->config_vector; 69 70 return 0; 71 } 72 73 static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) 74 { 75 VirtioCcwDeviceTmp *tmp = opaque; 76 VirtioCcwDevice *dev = tmp->parent; 77 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 78 79 vdev->config_vector = tmp->config_vector; 80 return 0; 81 } 82 83 const VMStateDescription vmstate_virtio_ccw_dev_tmp = { 84 .name = "s390_virtio_ccw_dev_tmp", 85 .pre_save = virtio_ccw_dev_tmp_pre_save, 86 .post_load = virtio_ccw_dev_tmp_post_load, 87 .fields = (VMStateField[]) { 88 VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), 89 VMSTATE_END_OF_LIST() 90 } 91 }; 92 93 const VMStateDescription vmstate_virtio_ccw_dev = { 94 .name = "s390_virtio_ccw_dev", 95 .version_id = 1, 96 .minimum_version_id = 1, 97 .post_load = virtio_ccw_dev_post_load, 98 .fields = (VMStateField[]) { 99 VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), 100 VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), 101 VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), 102 VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), 103 /* 104 * Ugly hack because VirtIODevice does not migrate itself. 105 * This also makes legacy via vmstate_save_state possible. 106 */ 107 VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, 108 vmstate_virtio_ccw_dev_tmp), 109 VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, 110 AdapterRoutes), 111 VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), 112 VMSTATE_INT32(revision, VirtioCcwDevice), 113 VMSTATE_END_OF_LIST() 114 } 115 }; 116 117 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 118 VirtioCcwDevice *dev); 119 120 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) 121 { 122 VirtIODevice *vdev = NULL; 123 VirtioCcwDevice *dev = sch->driver_data; 124 125 if (dev) { 126 vdev = virtio_bus_get_device(&dev->bus); 127 } 128 return vdev; 129 } 130 131 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) 132 { 133 virtio_bus_start_ioeventfd(&dev->bus); 134 } 135 136 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) 137 { 138 virtio_bus_stop_ioeventfd(&dev->bus); 139 } 140 141 static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) 142 { 143 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 144 145 return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; 146 } 147 148 static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 149 int n, bool assign) 150 { 151 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 152 CcwDevice *ccw_dev = CCW_DEVICE(dev); 153 SubchDev *sch = ccw_dev->sch; 154 uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; 155 156 return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); 157 } 158 159 /* Communication blocks used by several channel commands. */ 160 typedef struct VqInfoBlockLegacy { 161 uint64_t queue; 162 uint32_t align; 163 uint16_t index; 164 uint16_t num; 165 } QEMU_PACKED VqInfoBlockLegacy; 166 167 typedef struct VqInfoBlock { 168 uint64_t desc; 169 uint32_t res0; 170 uint16_t index; 171 uint16_t num; 172 uint64_t avail; 173 uint64_t used; 174 } QEMU_PACKED VqInfoBlock; 175 176 typedef struct VqConfigBlock { 177 uint16_t index; 178 uint16_t num_max; 179 } QEMU_PACKED VqConfigBlock; 180 181 typedef struct VirtioFeatDesc { 182 uint32_t features; 183 uint8_t index; 184 } QEMU_PACKED VirtioFeatDesc; 185 186 typedef struct VirtioThinintInfo { 187 hwaddr summary_indicator; 188 hwaddr device_indicator; 189 uint64_t ind_bit; 190 uint8_t isc; 191 } QEMU_PACKED VirtioThinintInfo; 192 193 typedef struct VirtioRevInfo { 194 uint16_t revision; 195 uint16_t length; 196 uint8_t data[0]; 197 } QEMU_PACKED VirtioRevInfo; 198 199 /* Specify where the virtqueues for the subchannel are in guest memory. */ 200 static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, 201 VqInfoBlockLegacy *linfo) 202 { 203 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 204 uint16_t index = info ? info->index : linfo->index; 205 uint16_t num = info ? info->num : linfo->num; 206 uint64_t desc = info ? info->desc : linfo->queue; 207 208 if (index >= VIRTIO_QUEUE_MAX) { 209 return -EINVAL; 210 } 211 212 /* Current code in virtio.c relies on 4K alignment. */ 213 if (linfo && desc && (linfo->align != 4096)) { 214 return -EINVAL; 215 } 216 217 if (!vdev) { 218 return -EINVAL; 219 } 220 221 if (info) { 222 virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); 223 } else { 224 virtio_queue_set_addr(vdev, index, desc); 225 } 226 if (!desc) { 227 virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); 228 } else { 229 if (info) { 230 /* virtio-1 allows changing the ring size. */ 231 if (virtio_queue_get_max_num(vdev, index) < num) { 232 /* Fail if we exceed the maximum number. */ 233 return -EINVAL; 234 } 235 virtio_queue_set_num(vdev, index, num); 236 } else if (virtio_queue_get_num(vdev, index) > num) { 237 /* Fail if we don't have a big enough queue. */ 238 return -EINVAL; 239 } 240 /* We ignore possible increased num for legacy for compatibility. */ 241 virtio_queue_set_vector(vdev, index, index); 242 } 243 /* tell notify handler in case of config change */ 244 vdev->config_vector = VIRTIO_QUEUE_MAX; 245 return 0; 246 } 247 248 static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev, VirtIODevice *vdev) 249 { 250 CcwDevice *ccw_dev = CCW_DEVICE(dev); 251 252 virtio_ccw_stop_ioeventfd(dev); 253 virtio_reset(vdev); 254 if (dev->indicators) { 255 release_indicator(&dev->routes.adapter, dev->indicators); 256 dev->indicators = NULL; 257 } 258 if (dev->indicators2) { 259 release_indicator(&dev->routes.adapter, dev->indicators2); 260 dev->indicators2 = NULL; 261 } 262 if (dev->summary_indicator) { 263 release_indicator(&dev->routes.adapter, dev->summary_indicator); 264 dev->summary_indicator = NULL; 265 } 266 ccw_dev->sch->thinint_active = false; 267 } 268 269 static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, 270 bool is_legacy) 271 { 272 int ret; 273 VqInfoBlock info; 274 VqInfoBlockLegacy linfo; 275 size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); 276 277 if (check_len) { 278 if (ccw.count != info_len) { 279 return -EINVAL; 280 } 281 } else if (ccw.count < info_len) { 282 /* Can't execute command. */ 283 return -EINVAL; 284 } 285 if (!ccw.cda) { 286 return -EFAULT; 287 } 288 if (is_legacy) { 289 ccw_dstream_read(&sch->cds, linfo); 290 linfo.queue = be64_to_cpu(linfo.queue); 291 linfo.align = be32_to_cpu(linfo.align); 292 linfo.index = be16_to_cpu(linfo.index); 293 linfo.num = be16_to_cpu(linfo.num); 294 ret = virtio_ccw_set_vqs(sch, NULL, &linfo); 295 } else { 296 ccw_dstream_read(&sch->cds, info); 297 info.desc = be64_to_cpu(info.desc); 298 info.index = be16_to_cpu(info.index); 299 info.num = be16_to_cpu(info.num); 300 info.avail = be64_to_cpu(info.avail); 301 info.used = be64_to_cpu(info.used); 302 ret = virtio_ccw_set_vqs(sch, &info, NULL); 303 } 304 sch->curr_status.scsw.count = 0; 305 return ret; 306 } 307 308 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 309 { 310 int ret; 311 VirtioRevInfo revinfo; 312 uint8_t status; 313 VirtioFeatDesc features; 314 hwaddr indicators; 315 VqConfigBlock vq_config; 316 VirtioCcwDevice *dev = sch->driver_data; 317 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 318 bool check_len; 319 int len; 320 VirtioThinintInfo thinint; 321 322 if (!dev) { 323 return -EINVAL; 324 } 325 326 trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, 327 ccw.cmd_code); 328 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 329 330 if (dev->force_revision_1 && dev->revision < 0 && 331 ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { 332 /* 333 * virtio-1 drivers must start with negotiating to a revision >= 1, 334 * so post a command reject for all other commands 335 */ 336 return -ENOSYS; 337 } 338 339 /* Look at the command. */ 340 switch (ccw.cmd_code) { 341 case CCW_CMD_SET_VQ: 342 ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); 343 break; 344 case CCW_CMD_VDEV_RESET: 345 virtio_ccw_reset_virtio(dev, vdev); 346 ret = 0; 347 break; 348 case CCW_CMD_READ_FEAT: 349 if (check_len) { 350 if (ccw.count != sizeof(features)) { 351 ret = -EINVAL; 352 break; 353 } 354 } else if (ccw.count < sizeof(features)) { 355 /* Can't execute command. */ 356 ret = -EINVAL; 357 break; 358 } 359 if (!ccw.cda) { 360 ret = -EFAULT; 361 } else { 362 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 363 364 ccw_dstream_advance(&sch->cds, sizeof(features.features)); 365 ccw_dstream_read(&sch->cds, features.index); 366 if (features.index == 0) { 367 if (dev->revision >= 1) { 368 /* Don't offer legacy features for modern devices. */ 369 features.features = (uint32_t) 370 (vdev->host_features & ~vdc->legacy_features); 371 } else { 372 features.features = (uint32_t)vdev->host_features; 373 } 374 } else if ((features.index == 1) && (dev->revision >= 1)) { 375 /* 376 * Only offer feature bits beyond 31 if the guest has 377 * negotiated at least revision 1. 378 */ 379 features.features = (uint32_t)(vdev->host_features >> 32); 380 } else { 381 /* Return zeroes if the guest supports more feature bits. */ 382 features.features = 0; 383 } 384 ccw_dstream_rewind(&sch->cds); 385 features.features = cpu_to_le32(features.features); 386 ccw_dstream_write(&sch->cds, features.features); 387 sch->curr_status.scsw.count = ccw.count - sizeof(features); 388 ret = 0; 389 } 390 break; 391 case CCW_CMD_WRITE_FEAT: 392 if (check_len) { 393 if (ccw.count != sizeof(features)) { 394 ret = -EINVAL; 395 break; 396 } 397 } else if (ccw.count < sizeof(features)) { 398 /* Can't execute command. */ 399 ret = -EINVAL; 400 break; 401 } 402 if (!ccw.cda) { 403 ret = -EFAULT; 404 } else { 405 ccw_dstream_read(&sch->cds, features); 406 features.features = le32_to_cpu(features.features); 407 if (features.index == 0) { 408 virtio_set_features(vdev, 409 (vdev->guest_features & 0xffffffff00000000ULL) | 410 features.features); 411 } else if ((features.index == 1) && (dev->revision >= 1)) { 412 /* 413 * If the guest did not negotiate at least revision 1, 414 * we did not offer it any feature bits beyond 31. Such a 415 * guest passing us any bit here is therefore buggy. 416 */ 417 virtio_set_features(vdev, 418 (vdev->guest_features & 0x00000000ffffffffULL) | 419 ((uint64_t)features.features << 32)); 420 } else { 421 /* 422 * If the guest supports more feature bits, assert that it 423 * passes us zeroes for those we don't support. 424 */ 425 if (features.features) { 426 qemu_log_mask(LOG_GUEST_ERROR, 427 "Guest bug: features[%i]=%x (expected 0)", 428 features.index, features.features); 429 /* XXX: do a unit check here? */ 430 } 431 } 432 sch->curr_status.scsw.count = ccw.count - sizeof(features); 433 ret = 0; 434 } 435 break; 436 case CCW_CMD_READ_CONF: 437 if (check_len) { 438 if (ccw.count > vdev->config_len) { 439 ret = -EINVAL; 440 break; 441 } 442 } 443 len = MIN(ccw.count, vdev->config_len); 444 if (!ccw.cda) { 445 ret = -EFAULT; 446 } else { 447 virtio_bus_get_vdev_config(&dev->bus, vdev->config); 448 ccw_dstream_write_buf(&sch->cds, vdev->config, len); 449 sch->curr_status.scsw.count = ccw.count - len; 450 ret = 0; 451 } 452 break; 453 case CCW_CMD_WRITE_CONF: 454 if (check_len) { 455 if (ccw.count > vdev->config_len) { 456 ret = -EINVAL; 457 break; 458 } 459 } 460 len = MIN(ccw.count, vdev->config_len); 461 if (!ccw.cda) { 462 ret = -EFAULT; 463 } else { 464 ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); 465 if (!ret) { 466 virtio_bus_set_vdev_config(&dev->bus, vdev->config); 467 sch->curr_status.scsw.count = ccw.count - len; 468 } 469 } 470 break; 471 case CCW_CMD_READ_STATUS: 472 if (check_len) { 473 if (ccw.count != sizeof(status)) { 474 ret = -EINVAL; 475 break; 476 } 477 } else if (ccw.count < sizeof(status)) { 478 /* Can't execute command. */ 479 ret = -EINVAL; 480 break; 481 } 482 if (!ccw.cda) { 483 ret = -EFAULT; 484 } else { 485 address_space_stb(&address_space_memory, ccw.cda, vdev->status, 486 MEMTXATTRS_UNSPECIFIED, NULL); 487 sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); 488 ret = 0; 489 } 490 break; 491 case CCW_CMD_WRITE_STATUS: 492 if (check_len) { 493 if (ccw.count != sizeof(status)) { 494 ret = -EINVAL; 495 break; 496 } 497 } else if (ccw.count < sizeof(status)) { 498 /* Can't execute command. */ 499 ret = -EINVAL; 500 break; 501 } 502 if (!ccw.cda) { 503 ret = -EFAULT; 504 } else { 505 ccw_dstream_read(&sch->cds, status); 506 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 507 virtio_ccw_stop_ioeventfd(dev); 508 } 509 if (virtio_set_status(vdev, status) == 0) { 510 if (vdev->status == 0) { 511 virtio_ccw_reset_virtio(dev, vdev); 512 } 513 if (status & VIRTIO_CONFIG_S_DRIVER_OK) { 514 virtio_ccw_start_ioeventfd(dev); 515 } 516 sch->curr_status.scsw.count = ccw.count - sizeof(status); 517 ret = 0; 518 } else { 519 /* Trigger a command reject. */ 520 ret = -ENOSYS; 521 } 522 } 523 break; 524 case CCW_CMD_SET_IND: 525 if (check_len) { 526 if (ccw.count != sizeof(indicators)) { 527 ret = -EINVAL; 528 break; 529 } 530 } else if (ccw.count < sizeof(indicators)) { 531 /* Can't execute command. */ 532 ret = -EINVAL; 533 break; 534 } 535 if (sch->thinint_active) { 536 /* Trigger a command reject. */ 537 ret = -ENOSYS; 538 break; 539 } 540 if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { 541 /* More queues than indicator bits --> trigger a reject */ 542 ret = -ENOSYS; 543 break; 544 } 545 if (!ccw.cda) { 546 ret = -EFAULT; 547 } else { 548 ccw_dstream_read(&sch->cds, indicators); 549 indicators = be64_to_cpu(indicators); 550 dev->indicators = get_indicator(indicators, sizeof(uint64_t)); 551 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 552 ret = 0; 553 } 554 break; 555 case CCW_CMD_SET_CONF_IND: 556 if (check_len) { 557 if (ccw.count != sizeof(indicators)) { 558 ret = -EINVAL; 559 break; 560 } 561 } else if (ccw.count < sizeof(indicators)) { 562 /* Can't execute command. */ 563 ret = -EINVAL; 564 break; 565 } 566 if (!ccw.cda) { 567 ret = -EFAULT; 568 } else { 569 ccw_dstream_read(&sch->cds, indicators); 570 indicators = be64_to_cpu(indicators); 571 dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); 572 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 573 ret = 0; 574 } 575 break; 576 case CCW_CMD_READ_VQ_CONF: 577 if (check_len) { 578 if (ccw.count != sizeof(vq_config)) { 579 ret = -EINVAL; 580 break; 581 } 582 } else if (ccw.count < sizeof(vq_config)) { 583 /* Can't execute command. */ 584 ret = -EINVAL; 585 break; 586 } 587 if (!ccw.cda) { 588 ret = -EFAULT; 589 } else { 590 ccw_dstream_read(&sch->cds, vq_config.index); 591 vq_config.index = be16_to_cpu(vq_config.index); 592 if (vq_config.index >= VIRTIO_QUEUE_MAX) { 593 ret = -EINVAL; 594 break; 595 } 596 vq_config.num_max = virtio_queue_get_num(vdev, 597 vq_config.index); 598 vq_config.num_max = cpu_to_be16(vq_config.num_max); 599 ccw_dstream_write(&sch->cds, vq_config.num_max); 600 sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); 601 ret = 0; 602 } 603 break; 604 case CCW_CMD_SET_IND_ADAPTER: 605 if (check_len) { 606 if (ccw.count != sizeof(thinint)) { 607 ret = -EINVAL; 608 break; 609 } 610 } else if (ccw.count < sizeof(thinint)) { 611 /* Can't execute command. */ 612 ret = -EINVAL; 613 break; 614 } 615 if (!ccw.cda) { 616 ret = -EFAULT; 617 } else if (dev->indicators && !sch->thinint_active) { 618 /* Trigger a command reject. */ 619 ret = -ENOSYS; 620 } else { 621 if (ccw_dstream_read(&sch->cds, thinint)) { 622 ret = -EFAULT; 623 } else { 624 thinint.ind_bit = be64_to_cpu(thinint.ind_bit); 625 thinint.summary_indicator = 626 be64_to_cpu(thinint.summary_indicator); 627 thinint.device_indicator = 628 be64_to_cpu(thinint.device_indicator); 629 630 dev->summary_indicator = 631 get_indicator(thinint.summary_indicator, sizeof(uint8_t)); 632 dev->indicators = 633 get_indicator(thinint.device_indicator, 634 thinint.ind_bit / 8 + 1); 635 dev->thinint_isc = thinint.isc; 636 dev->routes.adapter.ind_offset = thinint.ind_bit; 637 dev->routes.adapter.summary_offset = 7; 638 dev->routes.adapter.adapter_id = css_get_adapter_id( 639 CSS_IO_ADAPTER_VIRTIO, 640 dev->thinint_isc); 641 sch->thinint_active = ((dev->indicators != NULL) && 642 (dev->summary_indicator != NULL)); 643 sch->curr_status.scsw.count = ccw.count - sizeof(thinint); 644 ret = 0; 645 } 646 } 647 break; 648 case CCW_CMD_SET_VIRTIO_REV: 649 len = sizeof(revinfo); 650 if (ccw.count < len) { 651 ret = -EINVAL; 652 break; 653 } 654 if (!ccw.cda) { 655 ret = -EFAULT; 656 break; 657 } 658 ccw_dstream_read_buf(&sch->cds, &revinfo, 4); 659 revinfo.revision = be16_to_cpu(revinfo.revision); 660 revinfo.length = be16_to_cpu(revinfo.length); 661 if (ccw.count < len + revinfo.length || 662 (check_len && ccw.count > len + revinfo.length)) { 663 ret = -EINVAL; 664 break; 665 } 666 /* 667 * Once we start to support revisions with additional data, we'll 668 * need to fetch it here. Nothing to do for now, though. 669 */ 670 if (dev->revision >= 0 || 671 revinfo.revision > virtio_ccw_rev_max(dev) || 672 (dev->force_revision_1 && !revinfo.revision)) { 673 ret = -ENOSYS; 674 break; 675 } 676 ret = 0; 677 dev->revision = revinfo.revision; 678 break; 679 default: 680 ret = -ENOSYS; 681 break; 682 } 683 return ret; 684 } 685 686 static void virtio_sch_disable_cb(SubchDev *sch) 687 { 688 VirtioCcwDevice *dev = sch->driver_data; 689 690 dev->revision = -1; 691 } 692 693 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) 694 { 695 VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 696 CcwDevice *ccw_dev = CCW_DEVICE(dev); 697 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 698 SubchDev *sch; 699 Error *err = NULL; 700 int i; 701 702 sch = css_create_sch(ccw_dev->devno, errp); 703 if (!sch) { 704 return; 705 } 706 if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { 707 error_setg(&err, "Invalid value of property max_rev " 708 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 709 goto out_err; 710 } 711 712 sch->driver_data = dev; 713 sch->ccw_cb = virtio_ccw_cb; 714 sch->disable_cb = virtio_sch_disable_cb; 715 sch->id.reserved = 0xff; 716 sch->id.cu_type = VIRTIO_CCW_CU_TYPE; 717 sch->do_subchannel_work = do_subchannel_work_virtual; 718 ccw_dev->sch = sch; 719 dev->indicators = NULL; 720 dev->revision = -1; 721 for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { 722 dev->routes.gsi[i] = -1; 723 } 724 css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); 725 726 trace_virtio_ccw_new_device( 727 sch->cssid, sch->ssid, sch->schid, sch->devno, 728 ccw_dev->devno.valid ? "user-configured" : "auto-configured"); 729 730 if (kvm_enabled() && !kvm_eventfds_enabled()) { 731 dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; 732 } 733 734 if (k->realize) { 735 k->realize(dev, &err); 736 if (err) { 737 goto out_err; 738 } 739 } 740 741 ck->realize(ccw_dev, &err); 742 if (err) { 743 goto out_err; 744 } 745 746 return; 747 748 out_err: 749 error_propagate(errp, err); 750 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 751 ccw_dev->sch = NULL; 752 g_free(sch); 753 } 754 755 static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev, Error **errp) 756 { 757 VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 758 CcwDevice *ccw_dev = CCW_DEVICE(dev); 759 SubchDev *sch = ccw_dev->sch; 760 761 if (dc->unrealize) { 762 dc->unrealize(dev, errp); 763 } 764 765 if (sch) { 766 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 767 g_free(sch); 768 ccw_dev->sch = NULL; 769 } 770 if (dev->indicators) { 771 release_indicator(&dev->routes.adapter, dev->indicators); 772 dev->indicators = NULL; 773 } 774 } 775 776 /* DeviceState to VirtioCcwDevice. Note: used on datapath, 777 * be careful and test performance if you change this. 778 */ 779 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) 780 { 781 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 782 783 return container_of(ccw_dev, VirtioCcwDevice, parent_obj); 784 } 785 786 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, 787 uint8_t to_be_set) 788 { 789 uint8_t ind_old, ind_new; 790 hwaddr len = 1; 791 uint8_t *ind_addr; 792 793 ind_addr = cpu_physical_memory_map(ind_loc, &len, 1); 794 if (!ind_addr) { 795 error_report("%s(%x.%x.%04x): unable to access indicator", 796 __func__, sch->cssid, sch->ssid, sch->schid); 797 return -1; 798 } 799 do { 800 ind_old = *ind_addr; 801 ind_new = ind_old | to_be_set; 802 } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old); 803 trace_virtio_ccw_set_ind(ind_loc, ind_old, ind_new); 804 cpu_physical_memory_unmap(ind_addr, len, 1, len); 805 806 return ind_old; 807 } 808 809 static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 810 { 811 VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); 812 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 813 SubchDev *sch = ccw_dev->sch; 814 uint64_t indicators; 815 816 if (vector == VIRTIO_NO_VECTOR) { 817 return; 818 } 819 /* 820 * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue 821 * vector == VIRTIO_QUEUE_MAX: configuration change notification 822 * bits beyond that are unused and should never be notified for 823 */ 824 assert(vector <= VIRTIO_QUEUE_MAX); 825 826 if (vector < VIRTIO_QUEUE_MAX) { 827 if (!dev->indicators) { 828 return; 829 } 830 if (sch->thinint_active) { 831 /* 832 * In the adapter interrupt case, indicators points to a 833 * memory area that may be (way) larger than 64 bit and 834 * ind_bit indicates the start of the indicators in a big 835 * endian notation. 836 */ 837 uint64_t ind_bit = dev->routes.adapter.ind_offset; 838 839 virtio_set_ind_atomic(sch, dev->indicators->addr + 840 (ind_bit + vector) / 8, 841 0x80 >> ((ind_bit + vector) % 8)); 842 if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, 843 0x01)) { 844 css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); 845 } 846 } else { 847 assert(vector < NR_CLASSIC_INDICATOR_BITS); 848 indicators = address_space_ldq(&address_space_memory, 849 dev->indicators->addr, 850 MEMTXATTRS_UNSPECIFIED, 851 NULL); 852 indicators |= 1ULL << vector; 853 address_space_stq(&address_space_memory, dev->indicators->addr, 854 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 855 css_conditional_io_interrupt(sch); 856 } 857 } else { 858 if (!dev->indicators2) { 859 return; 860 } 861 indicators = address_space_ldq(&address_space_memory, 862 dev->indicators2->addr, 863 MEMTXATTRS_UNSPECIFIED, 864 NULL); 865 indicators |= 1ULL; 866 address_space_stq(&address_space_memory, dev->indicators2->addr, 867 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 868 css_conditional_io_interrupt(sch); 869 } 870 } 871 872 static void virtio_ccw_reset(DeviceState *d) 873 { 874 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 875 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 876 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 877 878 virtio_ccw_reset_virtio(dev, vdev); 879 if (vdc->parent_reset) { 880 vdc->parent_reset(d); 881 } 882 } 883 884 static void virtio_ccw_vmstate_change(DeviceState *d, bool running) 885 { 886 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 887 888 if (running) { 889 virtio_ccw_start_ioeventfd(dev); 890 } else { 891 virtio_ccw_stop_ioeventfd(dev); 892 } 893 } 894 895 static bool virtio_ccw_query_guest_notifiers(DeviceState *d) 896 { 897 CcwDevice *dev = CCW_DEVICE(d); 898 899 return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); 900 } 901 902 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) 903 { 904 int r; 905 CcwDevice *ccw_dev = CCW_DEVICE(dev); 906 907 if (!ccw_dev->sch->thinint_active) { 908 return -EINVAL; 909 } 910 911 r = map_indicator(&dev->routes.adapter, dev->summary_indicator); 912 if (r) { 913 return r; 914 } 915 r = map_indicator(&dev->routes.adapter, dev->indicators); 916 if (r) { 917 return r; 918 } 919 dev->routes.adapter.summary_addr = dev->summary_indicator->map; 920 dev->routes.adapter.ind_addr = dev->indicators->map; 921 922 return 0; 923 } 924 925 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) 926 { 927 int i; 928 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 929 int ret; 930 S390FLICState *fs = s390_get_flic(); 931 S390FLICStateClass *fsc = s390_get_flic_class(fs); 932 933 ret = virtio_ccw_get_mappings(dev); 934 if (ret) { 935 return ret; 936 } 937 for (i = 0; i < nvqs; i++) { 938 if (!virtio_queue_get_num(vdev, i)) { 939 break; 940 } 941 } 942 dev->routes.num_routes = i; 943 return fsc->add_adapter_routes(fs, &dev->routes); 944 } 945 946 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) 947 { 948 S390FLICState *fs = s390_get_flic(); 949 S390FLICStateClass *fsc = s390_get_flic_class(fs); 950 951 fsc->release_adapter_routes(fs, &dev->routes); 952 } 953 954 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) 955 { 956 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 957 VirtQueue *vq = virtio_get_queue(vdev, n); 958 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 959 960 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, 961 dev->routes.gsi[n]); 962 } 963 964 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) 965 { 966 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 967 VirtQueue *vq = virtio_get_queue(vdev, n); 968 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 969 int ret; 970 971 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, 972 dev->routes.gsi[n]); 973 assert(ret == 0); 974 } 975 976 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, 977 bool assign, bool with_irqfd) 978 { 979 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 980 VirtQueue *vq = virtio_get_queue(vdev, n); 981 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 982 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 983 984 if (assign) { 985 int r = event_notifier_init(notifier, 0); 986 987 if (r < 0) { 988 return r; 989 } 990 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 991 if (with_irqfd) { 992 r = virtio_ccw_add_irqfd(dev, n); 993 if (r) { 994 virtio_queue_set_guest_notifier_fd_handler(vq, false, 995 with_irqfd); 996 return r; 997 } 998 } 999 /* 1000 * We do not support individual masking for channel devices, so we 1001 * need to manually trigger any guest masking callbacks here. 1002 */ 1003 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1004 k->guest_notifier_mask(vdev, n, false); 1005 } 1006 /* get lost events and re-inject */ 1007 if (k->guest_notifier_pending && 1008 k->guest_notifier_pending(vdev, n)) { 1009 event_notifier_set(notifier); 1010 } 1011 } else { 1012 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1013 k->guest_notifier_mask(vdev, n, true); 1014 } 1015 if (with_irqfd) { 1016 virtio_ccw_remove_irqfd(dev, n); 1017 } 1018 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 1019 event_notifier_cleanup(notifier); 1020 } 1021 return 0; 1022 } 1023 1024 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, 1025 bool assigned) 1026 { 1027 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1028 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1029 CcwDevice *ccw_dev = CCW_DEVICE(d); 1030 bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); 1031 int r, n; 1032 1033 if (with_irqfd && assigned) { 1034 /* irq routes need to be set up before assigning irqfds */ 1035 r = virtio_ccw_setup_irqroutes(dev, nvqs); 1036 if (r < 0) { 1037 goto irqroute_error; 1038 } 1039 } 1040 for (n = 0; n < nvqs; n++) { 1041 if (!virtio_queue_get_num(vdev, n)) { 1042 break; 1043 } 1044 r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); 1045 if (r < 0) { 1046 goto assign_error; 1047 } 1048 } 1049 if (with_irqfd && !assigned) { 1050 /* release irq routes after irqfds have been released */ 1051 virtio_ccw_release_irqroutes(dev, nvqs); 1052 } 1053 return 0; 1054 1055 assign_error: 1056 while (--n >= 0) { 1057 virtio_ccw_set_guest_notifier(dev, n, !assigned, false); 1058 } 1059 irqroute_error: 1060 if (with_irqfd && assigned) { 1061 virtio_ccw_release_irqroutes(dev, nvqs); 1062 } 1063 return r; 1064 } 1065 1066 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) 1067 { 1068 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1069 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1070 1071 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 1072 } 1073 1074 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) 1075 { 1076 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1077 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1078 uint16_t vector; 1079 1080 qemu_get_be16s(f, &vector); 1081 virtio_queue_set_vector(vdev, n , vector); 1082 1083 return 0; 1084 } 1085 1086 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) 1087 { 1088 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1089 vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); 1090 } 1091 1092 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) 1093 { 1094 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1095 return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); 1096 } 1097 1098 static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) 1099 { 1100 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1101 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1102 1103 if (dev->max_rev >= 1) { 1104 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1105 } 1106 } 1107 1108 /* This is called by virtio-bus just after the device is plugged. */ 1109 static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) 1110 { 1111 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1112 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1113 CcwDevice *ccw_dev = CCW_DEVICE(d); 1114 SubchDev *sch = ccw_dev->sch; 1115 int n = virtio_get_num_queues(vdev); 1116 S390FLICState *flic = s390_get_flic(); 1117 1118 if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1119 dev->max_rev = 0; 1120 } 1121 1122 if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { 1123 error_setg(errp, "The number of virtqueues %d " 1124 "exceeds virtio limit %d", n, 1125 VIRTIO_QUEUE_MAX); 1126 return; 1127 } 1128 if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { 1129 error_setg(errp, "The number of virtqueues %d " 1130 "exceeds flic adapter route limit %d", n, 1131 flic->adapter_routes_max_batch); 1132 return; 1133 } 1134 1135 sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); 1136 1137 1138 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1139 d->hotplugged, 1); 1140 } 1141 1142 static void virtio_ccw_device_unplugged(DeviceState *d) 1143 { 1144 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1145 1146 virtio_ccw_stop_ioeventfd(dev); 1147 } 1148 /**************** Virtio-ccw Bus Device Descriptions *******************/ 1149 1150 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) 1151 { 1152 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1153 1154 virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); 1155 virtio_ccw_device_realize(_dev, errp); 1156 } 1157 1158 static void virtio_ccw_busdev_unrealize(DeviceState *dev, Error **errp) 1159 { 1160 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1161 1162 virtio_ccw_device_unrealize(_dev, errp); 1163 } 1164 1165 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, 1166 DeviceState *dev, Error **errp) 1167 { 1168 VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); 1169 1170 virtio_ccw_stop_ioeventfd(_dev); 1171 } 1172 1173 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) 1174 { 1175 DeviceClass *dc = DEVICE_CLASS(klass); 1176 CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); 1177 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); 1178 1179 k->unplug = virtio_ccw_busdev_unplug; 1180 dc->realize = virtio_ccw_busdev_realize; 1181 dc->unrealize = virtio_ccw_busdev_unrealize; 1182 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 1183 device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); 1184 } 1185 1186 static const TypeInfo virtio_ccw_device_info = { 1187 .name = TYPE_VIRTIO_CCW_DEVICE, 1188 .parent = TYPE_CCW_DEVICE, 1189 .instance_size = sizeof(VirtioCcwDevice), 1190 .class_init = virtio_ccw_device_class_init, 1191 .class_size = sizeof(VirtIOCCWDeviceClass), 1192 .abstract = true, 1193 }; 1194 1195 /* virtio-ccw-bus */ 1196 1197 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 1198 VirtioCcwDevice *dev) 1199 { 1200 DeviceState *qdev = DEVICE(dev); 1201 char virtio_bus_name[] = "virtio-bus"; 1202 1203 qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS, 1204 qdev, virtio_bus_name); 1205 } 1206 1207 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) 1208 { 1209 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 1210 BusClass *bus_class = BUS_CLASS(klass); 1211 1212 bus_class->max_dev = 1; 1213 k->notify = virtio_ccw_notify; 1214 k->vmstate_change = virtio_ccw_vmstate_change; 1215 k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; 1216 k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; 1217 k->save_queue = virtio_ccw_save_queue; 1218 k->load_queue = virtio_ccw_load_queue; 1219 k->save_config = virtio_ccw_save_config; 1220 k->load_config = virtio_ccw_load_config; 1221 k->pre_plugged = virtio_ccw_pre_plugged; 1222 k->device_plugged = virtio_ccw_device_plugged; 1223 k->device_unplugged = virtio_ccw_device_unplugged; 1224 k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; 1225 k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; 1226 } 1227 1228 static const TypeInfo virtio_ccw_bus_info = { 1229 .name = TYPE_VIRTIO_CCW_BUS, 1230 .parent = TYPE_VIRTIO_BUS, 1231 .instance_size = sizeof(VirtioCcwBusState), 1232 .class_init = virtio_ccw_bus_class_init, 1233 }; 1234 1235 static void virtio_ccw_register(void) 1236 { 1237 type_register_static(&virtio_ccw_bus_info); 1238 type_register_static(&virtio_ccw_device_info); 1239 } 1240 1241 type_init(virtio_ccw_register) 1242