1 /* 2 * Virtio PCI driver - modern (virtio 1.0) device support 3 * 4 * This module allows virtio devices to be used over a virtual PCI device. 5 * This can be used with QEMU based VMMs like KVM or Xen. 6 * 7 * Copyright IBM Corp. 2007 8 * Copyright Red Hat, Inc. 2014 9 * 10 * Authors: 11 * Anthony Liguori <aliguori@us.ibm.com> 12 * Rusty Russell <rusty@rustcorp.com.au> 13 * Michael S. Tsirkin <mst@redhat.com> 14 * 15 * This work is licensed under the terms of the GNU GPL, version 2 or later. 16 * See the COPYING file in the top-level directory. 17 * 18 */ 19 20 #define VIRTIO_PCI_NO_LEGACY 21 #include "virtio_pci_common.h" 22 23 static void __iomem *map_capability(struct pci_dev *dev, int off, 24 size_t minlen, 25 u32 align, 26 u32 start, u32 size, 27 size_t *len) 28 { 29 u8 bar; 30 u32 offset, length; 31 void __iomem *p; 32 33 pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap, 34 bar), 35 &bar); 36 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset), 37 &offset); 38 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length), 39 &length); 40 41 if (length <= start) { 42 dev_err(&dev->dev, 43 "virtio_pci: bad capability len %u (>%u expected)\n", 44 length, start); 45 return NULL; 46 } 47 48 if (length - start < minlen) { 49 dev_err(&dev->dev, 50 "virtio_pci: bad capability len %u (>=%zu expected)\n", 51 length, minlen); 52 return NULL; 53 } 54 55 length -= start; 56 57 if (start + offset < offset) { 58 dev_err(&dev->dev, 59 "virtio_pci: map wrap-around %u+%u\n", 60 start, offset); 61 return NULL; 62 } 63 64 offset += start; 65 66 if (offset & (align - 1)) { 67 dev_err(&dev->dev, 68 "virtio_pci: offset %u not aligned to %u\n", 69 offset, align); 70 return NULL; 71 } 72 73 if (length > size) 74 length = size; 75 76 if (len) 77 *len = length; 78 79 if (minlen + offset < minlen || 80 minlen + offset > pci_resource_len(dev, bar)) { 81 dev_err(&dev->dev, 82 "virtio_pci: map virtio %zu@%u " 83 "out of range on bar %i length %lu\n", 84 minlen, offset, 85 bar, (unsigned long)pci_resource_len(dev, bar)); 86 return NULL; 87 } 88 89 p = pci_iomap_range(dev, bar, offset, length); 90 if (!p) 91 dev_err(&dev->dev, 92 "virtio_pci: unable to map virtio %u@%u on bar %i\n", 93 length, offset, bar); 94 return p; 95 } 96 97 static void iowrite64_twopart(u64 val, __le32 __iomem *lo, __le32 __iomem *hi) 98 { 99 iowrite32((u32)val, lo); 100 iowrite32(val >> 32, hi); 101 } 102 103 /* virtio config->get_features() implementation */ 104 static u64 vp_get_features(struct virtio_device *vdev) 105 { 106 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 107 u64 features; 108 109 iowrite32(0, &vp_dev->common->device_feature_select); 110 features = ioread32(&vp_dev->common->device_feature); 111 iowrite32(1, &vp_dev->common->device_feature_select); 112 features |= ((u64)ioread32(&vp_dev->common->device_feature) << 32); 113 114 return features; 115 } 116 117 /* virtio config->finalize_features() implementation */ 118 static int vp_finalize_features(struct virtio_device *vdev) 119 { 120 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 121 122 /* Give virtio_ring a chance to accept features. */ 123 vring_transport_features(vdev); 124 125 if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 126 dev_err(&vdev->dev, "virtio: device uses modern interface " 127 "but does not have VIRTIO_F_VERSION_1\n"); 128 return -EINVAL; 129 } 130 131 iowrite32(0, &vp_dev->common->guest_feature_select); 132 iowrite32((u32)vdev->features, &vp_dev->common->guest_feature); 133 iowrite32(1, &vp_dev->common->guest_feature_select); 134 iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature); 135 136 return 0; 137 } 138 139 /* virtio config->get() implementation */ 140 static void vp_get(struct virtio_device *vdev, unsigned offset, 141 void *buf, unsigned len) 142 { 143 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 144 u8 b; 145 __le16 w; 146 __le32 l; 147 148 BUG_ON(offset + len > vp_dev->device_len); 149 150 switch (len) { 151 case 1: 152 b = ioread8(vp_dev->device + offset); 153 memcpy(buf, &b, sizeof b); 154 break; 155 case 2: 156 w = cpu_to_le16(ioread16(vp_dev->device + offset)); 157 memcpy(buf, &w, sizeof w); 158 break; 159 case 4: 160 l = cpu_to_le32(ioread32(vp_dev->device + offset)); 161 memcpy(buf, &l, sizeof l); 162 break; 163 case 8: 164 l = cpu_to_le32(ioread32(vp_dev->device + offset)); 165 memcpy(buf, &l, sizeof l); 166 l = cpu_to_le32(ioread32(vp_dev->device + offset + sizeof l)); 167 memcpy(buf + sizeof l, &l, sizeof l); 168 break; 169 default: 170 BUG(); 171 } 172 } 173 174 /* the config->set() implementation. it's symmetric to the config->get() 175 * implementation */ 176 static void vp_set(struct virtio_device *vdev, unsigned offset, 177 const void *buf, unsigned len) 178 { 179 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 180 u8 b; 181 __le16 w; 182 __le32 l; 183 184 BUG_ON(offset + len > vp_dev->device_len); 185 186 switch (len) { 187 case 1: 188 memcpy(&b, buf, sizeof b); 189 iowrite8(b, vp_dev->device + offset); 190 break; 191 case 2: 192 memcpy(&w, buf, sizeof w); 193 iowrite16(le16_to_cpu(w), vp_dev->device + offset); 194 break; 195 case 4: 196 memcpy(&l, buf, sizeof l); 197 iowrite32(le32_to_cpu(l), vp_dev->device + offset); 198 break; 199 case 8: 200 memcpy(&l, buf, sizeof l); 201 iowrite32(le32_to_cpu(l), vp_dev->device + offset); 202 memcpy(&l, buf + sizeof l, sizeof l); 203 iowrite32(le32_to_cpu(l), vp_dev->device + offset + sizeof l); 204 break; 205 default: 206 BUG(); 207 } 208 } 209 210 static u32 vp_generation(struct virtio_device *vdev) 211 { 212 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 213 return ioread8(&vp_dev->common->config_generation); 214 } 215 216 /* config->{get,set}_status() implementations */ 217 static u8 vp_get_status(struct virtio_device *vdev) 218 { 219 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 220 return ioread8(&vp_dev->common->device_status); 221 } 222 223 static void vp_set_status(struct virtio_device *vdev, u8 status) 224 { 225 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 226 /* We should never be setting status to 0. */ 227 BUG_ON(status == 0); 228 iowrite8(status, &vp_dev->common->device_status); 229 } 230 231 static void vp_reset(struct virtio_device *vdev) 232 { 233 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 234 /* 0 status means a reset. */ 235 iowrite8(0, &vp_dev->common->device_status); 236 /* Flush out the status write, and flush in device writes, 237 * including MSI-X interrupts, if any. */ 238 ioread8(&vp_dev->common->device_status); 239 /* Flush pending VQ/configuration callbacks. */ 240 vp_synchronize_vectors(vdev); 241 } 242 243 static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector) 244 { 245 /* Setup the vector used for configuration events */ 246 iowrite16(vector, &vp_dev->common->msix_config); 247 /* Verify we had enough resources to assign the vector */ 248 /* Will also flush the write out to device */ 249 return ioread16(&vp_dev->common->msix_config); 250 } 251 252 static size_t vring_pci_size(u16 num) 253 { 254 /* We only need a cacheline separation. */ 255 return PAGE_ALIGN(vring_size(num, SMP_CACHE_BYTES)); 256 } 257 258 static void *alloc_virtqueue_pages(int *num) 259 { 260 void *pages; 261 262 /* TODO: allocate each queue chunk individually */ 263 for (; *num && vring_pci_size(*num) > PAGE_SIZE; *num /= 2) { 264 pages = alloc_pages_exact(vring_pci_size(*num), 265 GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN); 266 if (pages) 267 return pages; 268 } 269 270 if (!*num) 271 return NULL; 272 273 /* Try to get a single page. You are my only hope! */ 274 return alloc_pages_exact(vring_pci_size(*num), GFP_KERNEL|__GFP_ZERO); 275 } 276 277 static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, 278 struct virtio_pci_vq_info *info, 279 unsigned index, 280 void (*callback)(struct virtqueue *vq), 281 const char *name, 282 u16 msix_vec) 283 { 284 struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common; 285 struct virtqueue *vq; 286 u16 num, off; 287 int err; 288 289 if (index >= ioread16(&cfg->num_queues)) 290 return ERR_PTR(-ENOENT); 291 292 /* Select the queue we're interested in */ 293 iowrite16(index, &cfg->queue_select); 294 295 /* Check if queue is either not available or already active. */ 296 num = ioread16(&cfg->queue_size); 297 if (!num || ioread16(&cfg->queue_enable)) 298 return ERR_PTR(-ENOENT); 299 300 if (num & (num - 1)) { 301 dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num); 302 return ERR_PTR(-EINVAL); 303 } 304 305 /* get offset of notification word for this vq */ 306 off = ioread16(&cfg->queue_notify_off); 307 308 info->num = num; 309 info->msix_vector = msix_vec; 310 311 info->queue = alloc_virtqueue_pages(&info->num); 312 if (info->queue == NULL) 313 return ERR_PTR(-ENOMEM); 314 315 /* create the vring */ 316 vq = vring_new_virtqueue(index, info->num, 317 SMP_CACHE_BYTES, &vp_dev->vdev, 318 true, info->queue, vp_notify, callback, name); 319 if (!vq) { 320 err = -ENOMEM; 321 goto err_new_queue; 322 } 323 324 /* activate the queue */ 325 iowrite16(num, &cfg->queue_size); 326 iowrite64_twopart(virt_to_phys(info->queue), 327 &cfg->queue_desc_lo, &cfg->queue_desc_hi); 328 iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)), 329 &cfg->queue_avail_lo, &cfg->queue_avail_hi); 330 iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)), 331 &cfg->queue_used_lo, &cfg->queue_used_hi); 332 333 if (vp_dev->notify_base) { 334 /* offset should not wrap */ 335 if ((u64)off * vp_dev->notify_offset_multiplier + 2 336 > vp_dev->notify_len) { 337 dev_warn(&vp_dev->pci_dev->dev, 338 "bad notification offset %u (x %u) " 339 "for queue %u > %zd", 340 off, vp_dev->notify_offset_multiplier, 341 index, vp_dev->notify_len); 342 err = -EINVAL; 343 goto err_map_notify; 344 } 345 vq->priv = (void __force *)vp_dev->notify_base + 346 off * vp_dev->notify_offset_multiplier; 347 } else { 348 vq->priv = (void __force *)map_capability(vp_dev->pci_dev, 349 vp_dev->notify_map_cap, 2, 2, 350 off * vp_dev->notify_offset_multiplier, 2, 351 NULL); 352 } 353 354 if (!vq->priv) { 355 err = -ENOMEM; 356 goto err_map_notify; 357 } 358 359 if (msix_vec != VIRTIO_MSI_NO_VECTOR) { 360 iowrite16(msix_vec, &cfg->queue_msix_vector); 361 msix_vec = ioread16(&cfg->queue_msix_vector); 362 if (msix_vec == VIRTIO_MSI_NO_VECTOR) { 363 err = -EBUSY; 364 goto err_assign_vector; 365 } 366 } 367 368 return vq; 369 370 err_assign_vector: 371 if (!vp_dev->notify_base) 372 pci_iounmap(vp_dev->pci_dev, (void __iomem __force *)vq->priv); 373 err_map_notify: 374 vring_del_virtqueue(vq); 375 err_new_queue: 376 free_pages_exact(info->queue, vring_pci_size(info->num)); 377 return ERR_PTR(err); 378 } 379 380 static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs, 381 struct virtqueue *vqs[], 382 vq_callback_t *callbacks[], 383 const char *names[]) 384 { 385 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 386 struct virtqueue *vq; 387 int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names); 388 389 if (rc) 390 return rc; 391 392 /* Select and activate all queues. Has to be done last: once we do 393 * this, there's no way to go back except reset. 394 */ 395 list_for_each_entry(vq, &vdev->vqs, list) { 396 iowrite16(vq->index, &vp_dev->common->queue_select); 397 iowrite16(1, &vp_dev->common->queue_enable); 398 } 399 400 return 0; 401 } 402 403 static void del_vq(struct virtio_pci_vq_info *info) 404 { 405 struct virtqueue *vq = info->vq; 406 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); 407 408 iowrite16(vq->index, &vp_dev->common->queue_select); 409 410 if (vp_dev->msix_enabled) { 411 iowrite16(VIRTIO_MSI_NO_VECTOR, 412 &vp_dev->common->queue_msix_vector); 413 /* Flush the write out to device */ 414 ioread16(&vp_dev->common->queue_msix_vector); 415 } 416 417 if (!vp_dev->notify_base) 418 pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv); 419 420 vring_del_virtqueue(vq); 421 422 free_pages_exact(info->queue, vring_pci_size(info->num)); 423 } 424 425 static const struct virtio_config_ops virtio_pci_config_nodev_ops = { 426 .get = NULL, 427 .set = NULL, 428 .generation = vp_generation, 429 .get_status = vp_get_status, 430 .set_status = vp_set_status, 431 .reset = vp_reset, 432 .find_vqs = vp_modern_find_vqs, 433 .del_vqs = vp_del_vqs, 434 .get_features = vp_get_features, 435 .finalize_features = vp_finalize_features, 436 .bus_name = vp_bus_name, 437 .set_vq_affinity = vp_set_vq_affinity, 438 }; 439 440 static const struct virtio_config_ops virtio_pci_config_ops = { 441 .get = vp_get, 442 .set = vp_set, 443 .generation = vp_generation, 444 .get_status = vp_get_status, 445 .set_status = vp_set_status, 446 .reset = vp_reset, 447 .find_vqs = vp_modern_find_vqs, 448 .del_vqs = vp_del_vqs, 449 .get_features = vp_get_features, 450 .finalize_features = vp_finalize_features, 451 .bus_name = vp_bus_name, 452 .set_vq_affinity = vp_set_vq_affinity, 453 }; 454 455 /** 456 * virtio_pci_find_capability - walk capabilities to find device info. 457 * @dev: the pci device 458 * @cfg_type: the VIRTIO_PCI_CAP_* value we seek 459 * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO. 460 * 461 * Returns offset of the capability, or 0. 462 */ 463 static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type, 464 u32 ioresource_types) 465 { 466 int pos; 467 468 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); 469 pos > 0; 470 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { 471 u8 type, bar; 472 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 473 cfg_type), 474 &type); 475 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 476 bar), 477 &bar); 478 479 /* Ignore structures with reserved BAR values */ 480 if (bar > 0x5) 481 continue; 482 483 if (type == cfg_type) { 484 if (pci_resource_len(dev, bar) && 485 pci_resource_flags(dev, bar) & ioresource_types) 486 return pos; 487 } 488 } 489 return 0; 490 } 491 492 /* This is part of the ABI. Don't screw with it. */ 493 static inline void check_offsets(void) 494 { 495 /* Note: disk space was harmed in compilation of this function. */ 496 BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR != 497 offsetof(struct virtio_pci_cap, cap_vndr)); 498 BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT != 499 offsetof(struct virtio_pci_cap, cap_next)); 500 BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN != 501 offsetof(struct virtio_pci_cap, cap_len)); 502 BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE != 503 offsetof(struct virtio_pci_cap, cfg_type)); 504 BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR != 505 offsetof(struct virtio_pci_cap, bar)); 506 BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET != 507 offsetof(struct virtio_pci_cap, offset)); 508 BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH != 509 offsetof(struct virtio_pci_cap, length)); 510 BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT != 511 offsetof(struct virtio_pci_notify_cap, 512 notify_off_multiplier)); 513 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT != 514 offsetof(struct virtio_pci_common_cfg, 515 device_feature_select)); 516 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF != 517 offsetof(struct virtio_pci_common_cfg, device_feature)); 518 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT != 519 offsetof(struct virtio_pci_common_cfg, 520 guest_feature_select)); 521 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF != 522 offsetof(struct virtio_pci_common_cfg, guest_feature)); 523 BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX != 524 offsetof(struct virtio_pci_common_cfg, msix_config)); 525 BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ != 526 offsetof(struct virtio_pci_common_cfg, num_queues)); 527 BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS != 528 offsetof(struct virtio_pci_common_cfg, device_status)); 529 BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION != 530 offsetof(struct virtio_pci_common_cfg, config_generation)); 531 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT != 532 offsetof(struct virtio_pci_common_cfg, queue_select)); 533 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE != 534 offsetof(struct virtio_pci_common_cfg, queue_size)); 535 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX != 536 offsetof(struct virtio_pci_common_cfg, queue_msix_vector)); 537 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE != 538 offsetof(struct virtio_pci_common_cfg, queue_enable)); 539 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF != 540 offsetof(struct virtio_pci_common_cfg, queue_notify_off)); 541 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO != 542 offsetof(struct virtio_pci_common_cfg, queue_desc_lo)); 543 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI != 544 offsetof(struct virtio_pci_common_cfg, queue_desc_hi)); 545 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO != 546 offsetof(struct virtio_pci_common_cfg, queue_avail_lo)); 547 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI != 548 offsetof(struct virtio_pci_common_cfg, queue_avail_hi)); 549 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO != 550 offsetof(struct virtio_pci_common_cfg, queue_used_lo)); 551 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI != 552 offsetof(struct virtio_pci_common_cfg, queue_used_hi)); 553 } 554 555 /* the PCI probing function */ 556 int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) 557 { 558 struct pci_dev *pci_dev = vp_dev->pci_dev; 559 int err, common, isr, notify, device; 560 u32 notify_length; 561 u32 notify_offset; 562 563 check_offsets(); 564 565 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ 566 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) 567 return -ENODEV; 568 569 if (pci_dev->device < 0x1040) { 570 /* Transitional devices: use the PCI subsystem device id as 571 * virtio device id, same as legacy driver always did. 572 */ 573 vp_dev->vdev.id.device = pci_dev->subsystem_device; 574 } else { 575 /* Modern devices: simply use PCI device id, but start from 0x1040. */ 576 vp_dev->vdev.id.device = pci_dev->device - 0x1040; 577 } 578 vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor; 579 580 if (virtio_device_is_legacy_only(vp_dev->vdev.id)) 581 return -ENODEV; 582 583 /* check for a common config: if not, use legacy mode (bar 0). */ 584 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, 585 IORESOURCE_IO | IORESOURCE_MEM); 586 if (!common) { 587 dev_info(&pci_dev->dev, 588 "virtio_pci: leaving for legacy driver\n"); 589 return -ENODEV; 590 } 591 592 /* If common is there, these should be too... */ 593 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, 594 IORESOURCE_IO | IORESOURCE_MEM); 595 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, 596 IORESOURCE_IO | IORESOURCE_MEM); 597 if (!isr || !notify) { 598 dev_err(&pci_dev->dev, 599 "virtio_pci: missing capabilities %i/%i/%i\n", 600 common, isr, notify); 601 return -EINVAL; 602 } 603 604 /* Device capability is only mandatory for devices that have 605 * device-specific configuration. 606 */ 607 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, 608 IORESOURCE_IO | IORESOURCE_MEM); 609 610 err = -EINVAL; 611 vp_dev->common = map_capability(pci_dev, common, 612 sizeof(struct virtio_pci_common_cfg), 4, 613 0, sizeof(struct virtio_pci_common_cfg), 614 NULL); 615 if (!vp_dev->common) 616 goto err_map_common; 617 vp_dev->isr = map_capability(pci_dev, isr, sizeof(u8), 1, 618 0, 1, 619 NULL); 620 if (!vp_dev->isr) 621 goto err_map_isr; 622 623 /* Read notify_off_multiplier from config space. */ 624 pci_read_config_dword(pci_dev, 625 notify + offsetof(struct virtio_pci_notify_cap, 626 notify_off_multiplier), 627 &vp_dev->notify_offset_multiplier); 628 /* Read notify length and offset from config space. */ 629 pci_read_config_dword(pci_dev, 630 notify + offsetof(struct virtio_pci_notify_cap, 631 cap.length), 632 ¬ify_length); 633 634 pci_read_config_dword(pci_dev, 635 notify + offsetof(struct virtio_pci_notify_cap, 636 cap.length), 637 ¬ify_offset); 638 639 /* We don't know how many VQs we'll map, ahead of the time. 640 * If notify length is small, map it all now. 641 * Otherwise, map each VQ individually later. 642 */ 643 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { 644 vp_dev->notify_base = map_capability(pci_dev, notify, 2, 2, 645 0, notify_length, 646 &vp_dev->notify_len); 647 if (!vp_dev->notify_base) 648 goto err_map_notify; 649 } else { 650 vp_dev->notify_map_cap = notify; 651 } 652 653 /* Again, we don't know how much we should map, but PAGE_SIZE 654 * is more than enough for all existing devices. 655 */ 656 if (device) { 657 vp_dev->device = map_capability(pci_dev, device, 0, 4, 658 0, PAGE_SIZE, 659 &vp_dev->device_len); 660 if (!vp_dev->device) 661 goto err_map_device; 662 663 vp_dev->vdev.config = &virtio_pci_config_ops; 664 } else { 665 vp_dev->vdev.config = &virtio_pci_config_nodev_ops; 666 } 667 668 vp_dev->config_vector = vp_config_vector; 669 vp_dev->setup_vq = setup_vq; 670 vp_dev->del_vq = del_vq; 671 672 return 0; 673 674 err_map_device: 675 if (vp_dev->notify_base) 676 pci_iounmap(pci_dev, vp_dev->notify_base); 677 err_map_notify: 678 pci_iounmap(pci_dev, vp_dev->isr); 679 err_map_isr: 680 pci_iounmap(pci_dev, vp_dev->common); 681 err_map_common: 682 return err; 683 } 684 685 void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev) 686 { 687 struct pci_dev *pci_dev = vp_dev->pci_dev; 688 689 if (vp_dev->device) 690 pci_iounmap(pci_dev, vp_dev->device); 691 if (vp_dev->notify_base) 692 pci_iounmap(pci_dev, vp_dev->notify_base); 693 pci_iounmap(pci_dev, vp_dev->isr); 694 pci_iounmap(pci_dev, vp_dev->common); 695 } 696