1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Virtio PCI driver - modern (virtio 1.0) device support 4 * 5 * This module allows virtio devices to be used over a virtual PCI device. 6 * This can be used with QEMU based VMMs like KVM or Xen. 7 * 8 * Copyright IBM Corp. 2007 9 * Copyright Red Hat, Inc. 2014 10 * 11 * Authors: 12 * Anthony Liguori <aliguori@us.ibm.com> 13 * Rusty Russell <rusty@rustcorp.com.au> 14 * Michael S. Tsirkin <mst@redhat.com> 15 */ 16 17#include <linux/delay.h> 18#define VIRTIO_PCI_NO_LEGACY 19#define VIRTIO_RING_NO_LEGACY 20#include "virtio_pci_common.h" 21 22#define VIRTIO_AVQ_SGS_MAX 4 23 24static u64 vp_get_features(struct virtio_device *vdev) 25{ 26 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 27 28 return vp_modern_get_features(&vp_dev->mdev); 29} 30 31static bool vp_is_avq(struct virtio_device *vdev, unsigned int index) 32{ 33 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 34 35 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ)) 36 return false; 37 38 return index == vp_dev->admin_vq.vq_index; 39} 40 41static int virtqueue_exec_admin_cmd(struct virtio_pci_admin_vq *admin_vq, 42 u16 opcode, 43 struct scatterlist **sgs, 44 unsigned int out_num, 45 unsigned int in_num, 46 void *data) 47{ 48 struct virtqueue *vq; 49 int ret, len; 50 51 vq = admin_vq->info.vq; 52 if (!vq) 53 return -EIO; 54 55 if (opcode != VIRTIO_ADMIN_CMD_LIST_QUERY && 56 opcode != VIRTIO_ADMIN_CMD_LIST_USE && 57 !((1ULL << opcode) & admin_vq->supported_cmds)) 58 return -EOPNOTSUPP; 59 60 ret = virtqueue_add_sgs(vq, sgs, out_num, in_num, data, GFP_KERNEL); 61 if (ret < 0) 62 return -EIO; 63 64 if (unlikely(!virtqueue_kick(vq))) 65 return -EIO; 66 67 while (!virtqueue_get_buf(vq, &len) && 68 !virtqueue_is_broken(vq)) 69 cpu_relax(); 70 71 if (virtqueue_is_broken(vq)) 72 return -EIO; 73 74 return 0; 75} 76 77int vp_modern_admin_cmd_exec(struct virtio_device *vdev, 78 struct virtio_admin_cmd *cmd) 79{ 80 struct scatterlist *sgs[VIRTIO_AVQ_SGS_MAX], hdr, stat; 81 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 82 struct virtio_admin_cmd_status *va_status; 83 unsigned int out_num = 0, in_num = 0; 84 struct virtio_admin_cmd_hdr *va_hdr; 85 u16 status; 86 int ret; 87 88 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ)) 89 return -EOPNOTSUPP; 90 91 va_status = kzalloc(sizeof(*va_status), GFP_KERNEL); 92 if (!va_status) 93 return -ENOMEM; 94 95 va_hdr = kzalloc(sizeof(*va_hdr), GFP_KERNEL); 96 if (!va_hdr) { 97 ret = -ENOMEM; 98 goto err_alloc; 99 } 100 101 va_hdr->opcode = cmd->opcode; 102 va_hdr->group_type = cmd->group_type; 103 va_hdr->group_member_id = cmd->group_member_id; 104 105 /* Add header */ 106 sg_init_one(&hdr, va_hdr, sizeof(*va_hdr)); 107 sgs[out_num] = &hdr; 108 out_num++; 109 110 if (cmd->data_sg) { 111 sgs[out_num] = cmd->data_sg; 112 out_num++; 113 } 114 115 /* Add return status */ 116 sg_init_one(&stat, va_status, sizeof(*va_status)); 117 sgs[out_num + in_num] = &stat; 118 in_num++; 119 120 if (cmd->result_sg) { 121 sgs[out_num + in_num] = cmd->result_sg; 122 in_num++; 123 } 124 125 mutex_lock(&vp_dev->admin_vq.cmd_lock); 126 ret = virtqueue_exec_admin_cmd(&vp_dev->admin_vq, 127 le16_to_cpu(cmd->opcode), 128 sgs, out_num, in_num, sgs); 129 mutex_unlock(&vp_dev->admin_vq.cmd_lock); 130 131 if (ret) { 132 dev_err(&vdev->dev, 133 "Failed to execute command on admin vq: %d\n.", ret); 134 goto err_cmd_exec; 135 } 136 137 status = le16_to_cpu(va_status->status); 138 if (status != VIRTIO_ADMIN_STATUS_OK) { 139 dev_err(&vdev->dev, 140 "admin command error: status(%#x) qualifier(%#x)\n", 141 status, le16_to_cpu(va_status->status_qualifier)); 142 ret = -status; 143 } 144 145err_cmd_exec: 146 kfree(va_hdr); 147err_alloc: 148 kfree(va_status); 149 return ret; 150} 151 152static void virtio_pci_admin_cmd_list_init(struct virtio_device *virtio_dev) 153{ 154 struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev); 155 struct virtio_admin_cmd cmd = {}; 156 struct scatterlist result_sg; 157 struct scatterlist data_sg; 158 __le64 *data; 159 int ret; 160 161 data = kzalloc(sizeof(*data), GFP_KERNEL); 162 if (!data) 163 return; 164 165 sg_init_one(&result_sg, data, sizeof(*data)); 166 cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_QUERY); 167 cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV); 168 cmd.result_sg = &result_sg; 169 170 ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); 171 if (ret) 172 goto end; 173 174 *data &= cpu_to_le64(VIRTIO_ADMIN_CMD_BITMAP); 175 sg_init_one(&data_sg, data, sizeof(*data)); 176 cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_USE); 177 cmd.data_sg = &data_sg; 178 cmd.result_sg = NULL; 179 180 ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); 181 if (ret) 182 goto end; 183 184 vp_dev->admin_vq.supported_cmds = le64_to_cpu(*data); 185end: 186 kfree(data); 187} 188 189static void vp_modern_avq_activate(struct virtio_device *vdev) 190{ 191 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 192 struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq; 193 194 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ)) 195 return; 196 197 __virtqueue_unbreak(admin_vq->info.vq); 198 virtio_pci_admin_cmd_list_init(vdev); 199} 200 201static void vp_modern_avq_deactivate(struct virtio_device *vdev) 202{ 203 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 204 struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq; 205 206 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ)) 207 return; 208 209 __virtqueue_break(admin_vq->info.vq); 210} 211 212static void vp_transport_features(struct virtio_device *vdev, u64 features) 213{ 214 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 215 struct pci_dev *pci_dev = vp_dev->pci_dev; 216 217 if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) && 218 pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV)) 219 __virtio_set_bit(vdev, VIRTIO_F_SR_IOV); 220 221 if (features & BIT_ULL(VIRTIO_F_RING_RESET)) 222 __virtio_set_bit(vdev, VIRTIO_F_RING_RESET); 223 224 if (features & BIT_ULL(VIRTIO_F_ADMIN_VQ)) 225 __virtio_set_bit(vdev, VIRTIO_F_ADMIN_VQ); 226} 227 228static int __vp_check_common_size_one_feature(struct virtio_device *vdev, u32 fbit, 229 u32 offset, const char *fname) 230{ 231 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 232 233 if (!__virtio_test_bit(vdev, fbit)) 234 return 0; 235 236 if (likely(vp_dev->mdev.common_len >= offset)) 237 return 0; 238 239 dev_err(&vdev->dev, 240 "virtio: common cfg size(%zu) does not match the feature %s\n", 241 vp_dev->mdev.common_len, fname); 242 243 return -EINVAL; 244} 245 246#define vp_check_common_size_one_feature(vdev, fbit, field) \ 247 __vp_check_common_size_one_feature(vdev, fbit, \ 248 offsetofend(struct virtio_pci_modern_common_cfg, field), #fbit) 249 250static int vp_check_common_size(struct virtio_device *vdev) 251{ 252 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_NOTIF_CONFIG_DATA, queue_notify_data)) 253 return -EINVAL; 254 255 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_RING_RESET, queue_reset)) 256 return -EINVAL; 257 258 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_ADMIN_VQ, admin_queue_num)) 259 return -EINVAL; 260 261 return 0; 262} 263 264/* virtio config->finalize_features() implementation */ 265static int vp_finalize_features(struct virtio_device *vdev) 266{ 267 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 268 u64 features = vdev->features; 269 270 /* Give virtio_ring a chance to accept features. */ 271 vring_transport_features(vdev); 272 273 /* Give virtio_pci a chance to accept features. */ 274 vp_transport_features(vdev, features); 275 276 if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 277 dev_err(&vdev->dev, "virtio: device uses modern interface " 278 "but does not have VIRTIO_F_VERSION_1\n"); 279 return -EINVAL; 280 } 281 282 if (vp_check_common_size(vdev)) 283 return -EINVAL; 284 285 vp_modern_set_features(&vp_dev->mdev, vdev->features); 286 287 return 0; 288} 289 290/* virtio config->get() implementation */ 291static void vp_get(struct virtio_device *vdev, unsigned int offset, 292 void *buf, unsigned int len) 293{ 294 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 295 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 296 void __iomem *device = mdev->device; 297 u8 b; 298 __le16 w; 299 __le32 l; 300 301 BUG_ON(offset + len > mdev->device_len); 302 303 switch (len) { 304 case 1: 305 b = ioread8(device + offset); 306 memcpy(buf, &b, sizeof b); 307 break; 308 case 2: 309 w = cpu_to_le16(ioread16(device + offset)); 310 memcpy(buf, &w, sizeof w); 311 break; 312 case 4: 313 l = cpu_to_le32(ioread32(device + offset)); 314 memcpy(buf, &l, sizeof l); 315 break; 316 case 8: 317 l = cpu_to_le32(ioread32(device + offset)); 318 memcpy(buf, &l, sizeof l); 319 l = cpu_to_le32(ioread32(device + offset + sizeof l)); 320 memcpy(buf + sizeof l, &l, sizeof l); 321 break; 322 default: 323 BUG(); 324 } 325} 326 327/* the config->set() implementation. it's symmetric to the config->get() 328 * implementation */ 329static void vp_set(struct virtio_device *vdev, unsigned int offset, 330 const void *buf, unsigned int len) 331{ 332 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 333 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 334 void __iomem *device = mdev->device; 335 u8 b; 336 __le16 w; 337 __le32 l; 338 339 BUG_ON(offset + len > mdev->device_len); 340 341 switch (len) { 342 case 1: 343 memcpy(&b, buf, sizeof b); 344 iowrite8(b, device + offset); 345 break; 346 case 2: 347 memcpy(&w, buf, sizeof w); 348 iowrite16(le16_to_cpu(w), device + offset); 349 break; 350 case 4: 351 memcpy(&l, buf, sizeof l); 352 iowrite32(le32_to_cpu(l), device + offset); 353 break; 354 case 8: 355 memcpy(&l, buf, sizeof l); 356 iowrite32(le32_to_cpu(l), device + offset); 357 memcpy(&l, buf + sizeof l, sizeof l); 358 iowrite32(le32_to_cpu(l), device + offset + sizeof l); 359 break; 360 default: 361 BUG(); 362 } 363} 364 365static u32 vp_generation(struct virtio_device *vdev) 366{ 367 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 368 369 return vp_modern_generation(&vp_dev->mdev); 370} 371 372/* config->{get,set}_status() implementations */ 373static u8 vp_get_status(struct virtio_device *vdev) 374{ 375 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 376 377 return vp_modern_get_status(&vp_dev->mdev); 378} 379 380static void vp_set_status(struct virtio_device *vdev, u8 status) 381{ 382 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 383 384 /* We should never be setting status to 0. */ 385 BUG_ON(status == 0); 386 vp_modern_set_status(&vp_dev->mdev, status); 387 if (status & VIRTIO_CONFIG_S_DRIVER_OK) 388 vp_modern_avq_activate(vdev); 389} 390 391static void vp_reset(struct virtio_device *vdev) 392{ 393 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 394 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 395 396 /* 0 status means a reset. */ 397 vp_modern_set_status(mdev, 0); 398 /* After writing 0 to device_status, the driver MUST wait for a read of 399 * device_status to return 0 before reinitializing the device. 400 * This will flush out the status write, and flush in device writes, 401 * including MSI-X interrupts, if any. 402 */ 403 while (vp_modern_get_status(mdev)) 404 msleep(1); 405 406 vp_modern_avq_deactivate(vdev); 407 408 /* Flush pending VQ/configuration callbacks. */ 409 vp_synchronize_vectors(vdev); 410} 411 412static int vp_active_vq(struct virtqueue *vq, u16 msix_vec) 413{ 414 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); 415 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 416 unsigned long index; 417 418 index = vq->index; 419 420 /* activate the queue */ 421 vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq)); 422 vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq), 423 virtqueue_get_avail_addr(vq), 424 virtqueue_get_used_addr(vq)); 425 426 if (msix_vec != VIRTIO_MSI_NO_VECTOR) { 427 msix_vec = vp_modern_queue_vector(mdev, index, msix_vec); 428 if (msix_vec == VIRTIO_MSI_NO_VECTOR) 429 return -EBUSY; 430 } 431 432 return 0; 433} 434 435static int vp_modern_disable_vq_and_reset(struct virtqueue *vq) 436{ 437 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); 438 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 439 struct virtio_pci_vq_info *info; 440 unsigned long flags; 441 442 if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET)) 443 return -ENOENT; 444 445 vp_modern_set_queue_reset(mdev, vq->index); 446 447 info = vp_dev->vqs[vq->index]; 448 449 /* delete vq from irq handler */ 450 spin_lock_irqsave(&vp_dev->lock, flags); 451 list_del(&info->node); 452 spin_unlock_irqrestore(&vp_dev->lock, flags); 453 454 INIT_LIST_HEAD(&info->node); 455 456#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 457 __virtqueue_break(vq); 458#endif 459 460 /* For the case where vq has an exclusive irq, call synchronize_irq() to 461 * wait for completion. 462 * 463 * note: We can't use disable_irq() since it conflicts with the affinity 464 * managed IRQ that is used by some drivers. 465 */ 466 if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR) 467 synchronize_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector)); 468 469 vq->reset = true; 470 471 return 0; 472} 473 474static int vp_modern_enable_vq_after_reset(struct virtqueue *vq) 475{ 476 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); 477 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 478 struct virtio_pci_vq_info *info; 479 unsigned long flags, index; 480 int err; 481 482 if (!vq->reset) 483 return -EBUSY; 484 485 index = vq->index; 486 info = vp_dev->vqs[index]; 487 488 if (vp_modern_get_queue_reset(mdev, index)) 489 return -EBUSY; 490 491 if (vp_modern_get_queue_enable(mdev, index)) 492 return -EBUSY; 493 494 err = vp_active_vq(vq, info->msix_vector); 495 if (err) 496 return err; 497 498 if (vq->callback) { 499 spin_lock_irqsave(&vp_dev->lock, flags); 500 list_add(&info->node, &vp_dev->virtqueues); 501 spin_unlock_irqrestore(&vp_dev->lock, flags); 502 } else { 503 INIT_LIST_HEAD(&info->node); 504 } 505 506#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 507 __virtqueue_unbreak(vq); 508#endif 509 510 vp_modern_set_queue_enable(&vp_dev->mdev, index, true); 511 vq->reset = false; 512 513 return 0; 514} 515 516static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector) 517{ 518 return vp_modern_config_vector(&vp_dev->mdev, vector); 519} 520 521static bool vp_notify_with_data(struct virtqueue *vq) 522{ 523 u32 data = vring_notification_data(vq); 524 525 iowrite32(data, (void __iomem *)vq->priv); 526 527 return true; 528} 529 530static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, 531 struct virtio_pci_vq_info *info, 532 unsigned int index, 533 void (*callback)(struct virtqueue *vq), 534 const char *name, 535 bool ctx, 536 u16 msix_vec) 537{ 538 539 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 540 bool (*notify)(struct virtqueue *vq); 541 struct virtqueue *vq; 542 bool is_avq; 543 u16 num; 544 int err; 545 546 if (__virtio_test_bit(&vp_dev->vdev, VIRTIO_F_NOTIFICATION_DATA)) 547 notify = vp_notify_with_data; 548 else 549 notify = vp_notify; 550 551 is_avq = vp_is_avq(&vp_dev->vdev, index); 552 if (index >= vp_modern_get_num_queues(mdev) && !is_avq) 553 return ERR_PTR(-EINVAL); 554 555 num = is_avq ? 556 VIRTIO_AVQ_SGS_MAX : vp_modern_get_queue_size(mdev, index); 557 /* Check if queue is either not available or already active. */ 558 if (!num || vp_modern_get_queue_enable(mdev, index)) 559 return ERR_PTR(-ENOENT); 560 561 info->msix_vector = msix_vec; 562 563 /* create the vring */ 564 vq = vring_create_virtqueue(index, num, 565 SMP_CACHE_BYTES, &vp_dev->vdev, 566 true, true, ctx, 567 notify, callback, name); 568 if (!vq) 569 return ERR_PTR(-ENOMEM); 570 571 vq->num_max = num; 572 573 err = vp_active_vq(vq, msix_vec); 574 if (err) 575 goto err; 576 577 vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL); 578 if (!vq->priv) { 579 err = -ENOMEM; 580 goto err; 581 } 582 583 if (is_avq) { 584 mutex_lock(&vp_dev->admin_vq.cmd_lock); 585 vp_dev->admin_vq.info.vq = vq; 586 mutex_unlock(&vp_dev->admin_vq.cmd_lock); 587 } 588 589 return vq; 590 591err: 592 vring_del_virtqueue(vq); 593 return ERR_PTR(err); 594} 595 596static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned int nvqs, 597 struct virtqueue *vqs[], 598 vq_callback_t *callbacks[], 599 const char * const names[], const bool *ctx, 600 struct irq_affinity *desc) 601{ 602 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 603 struct virtqueue *vq; 604 int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc); 605 606 if (rc) 607 return rc; 608 609 /* Select and activate all queues. Has to be done last: once we do 610 * this, there's no way to go back except reset. 611 */ 612 list_for_each_entry(vq, &vdev->vqs, list) 613 vp_modern_set_queue_enable(&vp_dev->mdev, vq->index, true); 614 615 return 0; 616} 617 618static void del_vq(struct virtio_pci_vq_info *info) 619{ 620 struct virtqueue *vq = info->vq; 621 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); 622 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 623 624 if (vp_is_avq(&vp_dev->vdev, vq->index)) { 625 mutex_lock(&vp_dev->admin_vq.cmd_lock); 626 vp_dev->admin_vq.info.vq = NULL; 627 mutex_unlock(&vp_dev->admin_vq.cmd_lock); 628 } 629 630 if (vp_dev->msix_enabled) 631 vp_modern_queue_vector(mdev, vq->index, 632 VIRTIO_MSI_NO_VECTOR); 633 634 if (!mdev->notify_base) 635 pci_iounmap(mdev->pci_dev, (void __force __iomem *)vq->priv); 636 637 vring_del_virtqueue(vq); 638} 639 640static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id, 641 u8 *bar, u64 *offset, u64 *len) 642{ 643 int pos; 644 645 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); pos > 0; 646 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { 647 u8 type, cap_len, id, res_bar; 648 u32 tmp32; 649 u64 res_offset, res_length; 650 651 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 652 cfg_type), &type); 653 if (type != VIRTIO_PCI_CAP_SHARED_MEMORY_CFG) 654 continue; 655 656 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 657 cap_len), &cap_len); 658 if (cap_len != sizeof(struct virtio_pci_cap64)) { 659 dev_err(&dev->dev, "%s: shm cap with bad size offset:" 660 " %d size: %d\n", __func__, pos, cap_len); 661 continue; 662 } 663 664 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 665 id), &id); 666 if (id != required_id) 667 continue; 668 669 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 670 bar), &res_bar); 671 if (res_bar >= PCI_STD_NUM_BARS) 672 continue; 673 674 /* Type and ID match, and the BAR value isn't reserved. 675 * Looks good. 676 */ 677 678 /* Read the lower 32bit of length and offset */ 679 pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, 680 offset), &tmp32); 681 res_offset = tmp32; 682 pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, 683 length), &tmp32); 684 res_length = tmp32; 685 686 /* and now the top half */ 687 pci_read_config_dword(dev, 688 pos + offsetof(struct virtio_pci_cap64, 689 offset_hi), &tmp32); 690 res_offset |= ((u64)tmp32) << 32; 691 pci_read_config_dword(dev, 692 pos + offsetof(struct virtio_pci_cap64, 693 length_hi), &tmp32); 694 res_length |= ((u64)tmp32) << 32; 695 696 *bar = res_bar; 697 *offset = res_offset; 698 *len = res_length; 699 700 return pos; 701 } 702 return 0; 703} 704 705static bool vp_get_shm_region(struct virtio_device *vdev, 706 struct virtio_shm_region *region, u8 id) 707{ 708 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 709 struct pci_dev *pci_dev = vp_dev->pci_dev; 710 u8 bar; 711 u64 offset, len; 712 phys_addr_t phys_addr; 713 size_t bar_len; 714 715 if (!virtio_pci_find_shm_cap(pci_dev, id, &bar, &offset, &len)) 716 return false; 717 718 phys_addr = pci_resource_start(pci_dev, bar); 719 bar_len = pci_resource_len(pci_dev, bar); 720 721 if ((offset + len) < offset) { 722 dev_err(&pci_dev->dev, "%s: cap offset+len overflow detected\n", 723 __func__); 724 return false; 725 } 726 727 if (offset + len > bar_len) { 728 dev_err(&pci_dev->dev, "%s: bar shorter than cap offset+len\n", 729 __func__); 730 return false; 731 } 732 733 region->len = len; 734 region->addr = (u64) phys_addr + offset; 735 736 return true; 737} 738 739static int vp_modern_create_avq(struct virtio_device *vdev) 740{ 741 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 742 struct virtio_pci_admin_vq *avq; 743 struct virtqueue *vq; 744 u16 admin_q_num; 745 746 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ)) 747 return 0; 748 749 admin_q_num = vp_modern_avq_num(&vp_dev->mdev); 750 if (!admin_q_num) 751 return -EINVAL; 752 753 avq = &vp_dev->admin_vq; 754 avq->vq_index = vp_modern_avq_index(&vp_dev->mdev); 755 sprintf(avq->name, "avq.%u", avq->vq_index); 756 vq = vp_dev->setup_vq(vp_dev, &vp_dev->admin_vq.info, avq->vq_index, NULL, 757 avq->name, NULL, VIRTIO_MSI_NO_VECTOR); 758 if (IS_ERR(vq)) { 759 dev_err(&vdev->dev, "failed to setup admin virtqueue, err=%ld", 760 PTR_ERR(vq)); 761 return PTR_ERR(vq); 762 } 763 764 vp_modern_set_queue_enable(&vp_dev->mdev, avq->info.vq->index, true); 765 return 0; 766} 767 768static void vp_modern_destroy_avq(struct virtio_device *vdev) 769{ 770 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 771 772 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ)) 773 return; 774 775 vp_dev->del_vq(&vp_dev->admin_vq.info); 776} 777 778static const struct virtio_config_ops virtio_pci_config_nodev_ops = { 779 .get = NULL, 780 .set = NULL, 781 .generation = vp_generation, 782 .get_status = vp_get_status, 783 .set_status = vp_set_status, 784 .reset = vp_reset, 785 .find_vqs = vp_modern_find_vqs, 786 .del_vqs = vp_del_vqs, 787 .synchronize_cbs = vp_synchronize_vectors, 788 .get_features = vp_get_features, 789 .finalize_features = vp_finalize_features, 790 .bus_name = vp_bus_name, 791 .set_vq_affinity = vp_set_vq_affinity, 792 .get_vq_affinity = vp_get_vq_affinity, 793 .get_shm_region = vp_get_shm_region, 794 .disable_vq_and_reset = vp_modern_disable_vq_and_reset, 795 .enable_vq_after_reset = vp_modern_enable_vq_after_reset, 796 .create_avq = vp_modern_create_avq, 797 .destroy_avq = vp_modern_destroy_avq, 798}; 799 800static const struct virtio_config_ops virtio_pci_config_ops = { 801 .get = vp_get, 802 .set = vp_set, 803 .generation = vp_generation, 804 .get_status = vp_get_status, 805 .set_status = vp_set_status, 806 .reset = vp_reset, 807 .find_vqs = vp_modern_find_vqs, 808 .del_vqs = vp_del_vqs, 809 .synchronize_cbs = vp_synchronize_vectors, 810 .get_features = vp_get_features, 811 .finalize_features = vp_finalize_features, 812 .bus_name = vp_bus_name, 813 .set_vq_affinity = vp_set_vq_affinity, 814 .get_vq_affinity = vp_get_vq_affinity, 815 .get_shm_region = vp_get_shm_region, 816 .disable_vq_and_reset = vp_modern_disable_vq_and_reset, 817 .enable_vq_after_reset = vp_modern_enable_vq_after_reset, 818 .create_avq = vp_modern_create_avq, 819 .destroy_avq = vp_modern_destroy_avq, 820}; 821 822/* the PCI probing function */ 823int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) 824{ 825 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 826 struct pci_dev *pci_dev = vp_dev->pci_dev; 827 int err; 828 829 mdev->pci_dev = pci_dev; 830 831 err = vp_modern_probe(mdev); 832 if (err) 833 return err; 834 835 if (mdev->device) 836 vp_dev->vdev.config = &virtio_pci_config_ops; 837 else 838 vp_dev->vdev.config = &virtio_pci_config_nodev_ops; 839 840 vp_dev->config_vector = vp_config_vector; 841 vp_dev->setup_vq = setup_vq; 842 vp_dev->del_vq = del_vq; 843 vp_dev->is_avq = vp_is_avq; 844 vp_dev->isr = mdev->isr; 845 vp_dev->vdev.id = mdev->id; 846 847 mutex_init(&vp_dev->admin_vq.cmd_lock); 848 return 0; 849} 850 851void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev) 852{ 853 struct virtio_pci_modern_device *mdev = &vp_dev->mdev; 854 855 mutex_destroy(&vp_dev->admin_vq.cmd_lock); 856 vp_modern_remove(mdev); 857} 858