1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/virtio_pci_modern.h> 4 #include <linux/module.h> 5 #include <linux/pci.h> 6 7 /* 8 * vp_modern_map_capability - map a part of virtio pci capability 9 * @mdev: the modern virtio-pci device 10 * @off: offset of the capability 11 * @minlen: minimal length of the capability 12 * @align: align requirement 13 * @start: start from the capability 14 * @size: map size 15 * @len: the length that is actually mapped 16 * @pa: physical address of the capability 17 * 18 * Returns the io address of for the part of the capability 19 */ 20 static void __iomem * 21 vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off, 22 size_t minlen, u32 align, u32 start, u32 size, 23 size_t *len, resource_size_t *pa) 24 { 25 struct pci_dev *dev = mdev->pci_dev; 26 u8 bar; 27 u32 offset, length; 28 void __iomem *p; 29 30 pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap, 31 bar), 32 &bar); 33 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset), 34 &offset); 35 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length), 36 &length); 37 38 if (length <= start) { 39 dev_err(&dev->dev, 40 "virtio_pci: bad capability len %u (>%u expected)\n", 41 length, start); 42 return NULL; 43 } 44 45 if (length - start < minlen) { 46 dev_err(&dev->dev, 47 "virtio_pci: bad capability len %u (>=%zu expected)\n", 48 length, minlen); 49 return NULL; 50 } 51 52 length -= start; 53 54 if (start + offset < offset) { 55 dev_err(&dev->dev, 56 "virtio_pci: map wrap-around %u+%u\n", 57 start, offset); 58 return NULL; 59 } 60 61 offset += start; 62 63 if (offset & (align - 1)) { 64 dev_err(&dev->dev, 65 "virtio_pci: offset %u not aligned to %u\n", 66 offset, align); 67 return NULL; 68 } 69 70 if (length > size) 71 length = size; 72 73 if (len) 74 *len = length; 75 76 if (minlen + offset < minlen || 77 minlen + offset > pci_resource_len(dev, bar)) { 78 dev_err(&dev->dev, 79 "virtio_pci: map virtio %zu@%u " 80 "out of range on bar %i length %lu\n", 81 minlen, offset, 82 bar, (unsigned long)pci_resource_len(dev, bar)); 83 return NULL; 84 } 85 86 p = pci_iomap_range(dev, bar, offset, length); 87 if (!p) 88 dev_err(&dev->dev, 89 "virtio_pci: unable to map virtio %u@%u on bar %i\n", 90 length, offset, bar); 91 else if (pa) 92 *pa = pci_resource_start(dev, bar) + offset; 93 94 return p; 95 } 96 97 /** 98 * virtio_pci_find_capability - walk capabilities to find device info. 99 * @dev: the pci device 100 * @cfg_type: the VIRTIO_PCI_CAP_* value we seek 101 * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO. 102 * @bars: the bitmask of BARs 103 * 104 * Returns offset of the capability, or 0. 105 */ 106 static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type, 107 u32 ioresource_types, int *bars) 108 { 109 int pos; 110 111 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); 112 pos > 0; 113 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { 114 u8 type, bar; 115 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 116 cfg_type), 117 &type); 118 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 119 bar), 120 &bar); 121 122 /* Ignore structures with reserved BAR values */ 123 if (bar > 0x5) 124 continue; 125 126 if (type == cfg_type) { 127 if (pci_resource_len(dev, bar) && 128 pci_resource_flags(dev, bar) & ioresource_types) { 129 *bars |= (1 << bar); 130 return pos; 131 } 132 } 133 } 134 return 0; 135 } 136 137 /* This is part of the ABI. Don't screw with it. */ 138 static inline void check_offsets(void) 139 { 140 /* Note: disk space was harmed in compilation of this function. */ 141 BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR != 142 offsetof(struct virtio_pci_cap, cap_vndr)); 143 BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT != 144 offsetof(struct virtio_pci_cap, cap_next)); 145 BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN != 146 offsetof(struct virtio_pci_cap, cap_len)); 147 BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE != 148 offsetof(struct virtio_pci_cap, cfg_type)); 149 BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR != 150 offsetof(struct virtio_pci_cap, bar)); 151 BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET != 152 offsetof(struct virtio_pci_cap, offset)); 153 BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH != 154 offsetof(struct virtio_pci_cap, length)); 155 BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT != 156 offsetof(struct virtio_pci_notify_cap, 157 notify_off_multiplier)); 158 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT != 159 offsetof(struct virtio_pci_common_cfg, 160 device_feature_select)); 161 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF != 162 offsetof(struct virtio_pci_common_cfg, device_feature)); 163 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT != 164 offsetof(struct virtio_pci_common_cfg, 165 guest_feature_select)); 166 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF != 167 offsetof(struct virtio_pci_common_cfg, guest_feature)); 168 BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX != 169 offsetof(struct virtio_pci_common_cfg, msix_config)); 170 BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ != 171 offsetof(struct virtio_pci_common_cfg, num_queues)); 172 BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS != 173 offsetof(struct virtio_pci_common_cfg, device_status)); 174 BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION != 175 offsetof(struct virtio_pci_common_cfg, config_generation)); 176 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT != 177 offsetof(struct virtio_pci_common_cfg, queue_select)); 178 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE != 179 offsetof(struct virtio_pci_common_cfg, queue_size)); 180 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX != 181 offsetof(struct virtio_pci_common_cfg, queue_msix_vector)); 182 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE != 183 offsetof(struct virtio_pci_common_cfg, queue_enable)); 184 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF != 185 offsetof(struct virtio_pci_common_cfg, queue_notify_off)); 186 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO != 187 offsetof(struct virtio_pci_common_cfg, queue_desc_lo)); 188 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI != 189 offsetof(struct virtio_pci_common_cfg, queue_desc_hi)); 190 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO != 191 offsetof(struct virtio_pci_common_cfg, queue_avail_lo)); 192 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI != 193 offsetof(struct virtio_pci_common_cfg, queue_avail_hi)); 194 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO != 195 offsetof(struct virtio_pci_common_cfg, queue_used_lo)); 196 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI != 197 offsetof(struct virtio_pci_common_cfg, queue_used_hi)); 198 } 199 200 /* 201 * vp_modern_probe: probe the modern virtio pci device, note that the 202 * caller is required to enable PCI device before calling this function. 203 * @mdev: the modern virtio-pci device 204 * 205 * Return 0 on succeed otherwise fail 206 */ 207 int vp_modern_probe(struct virtio_pci_modern_device *mdev) 208 { 209 struct pci_dev *pci_dev = mdev->pci_dev; 210 int err, common, isr, notify, device; 211 u32 notify_length; 212 u32 notify_offset; 213 214 check_offsets(); 215 216 mdev->pci_dev = pci_dev; 217 218 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ 219 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) 220 return -ENODEV; 221 222 if (pci_dev->device < 0x1040) { 223 /* Transitional devices: use the PCI subsystem device id as 224 * virtio device id, same as legacy driver always did. 225 */ 226 mdev->id.device = pci_dev->subsystem_device; 227 } else { 228 /* Modern devices: simply use PCI device id, but start from 0x1040. */ 229 mdev->id.device = pci_dev->device - 0x1040; 230 } 231 mdev->id.vendor = pci_dev->subsystem_vendor; 232 233 /* check for a common config: if not, use legacy mode (bar 0). */ 234 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, 235 IORESOURCE_IO | IORESOURCE_MEM, 236 &mdev->modern_bars); 237 if (!common) { 238 dev_info(&pci_dev->dev, 239 "virtio_pci: leaving for legacy driver\n"); 240 return -ENODEV; 241 } 242 243 /* If common is there, these should be too... */ 244 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, 245 IORESOURCE_IO | IORESOURCE_MEM, 246 &mdev->modern_bars); 247 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, 248 IORESOURCE_IO | IORESOURCE_MEM, 249 &mdev->modern_bars); 250 if (!isr || !notify) { 251 dev_err(&pci_dev->dev, 252 "virtio_pci: missing capabilities %i/%i/%i\n", 253 common, isr, notify); 254 return -EINVAL; 255 } 256 257 err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64)); 258 if (err) 259 err = dma_set_mask_and_coherent(&pci_dev->dev, 260 DMA_BIT_MASK(32)); 261 if (err) 262 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); 263 264 /* Device capability is only mandatory for devices that have 265 * device-specific configuration. 266 */ 267 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, 268 IORESOURCE_IO | IORESOURCE_MEM, 269 &mdev->modern_bars); 270 271 err = pci_request_selected_regions(pci_dev, mdev->modern_bars, 272 "virtio-pci-modern"); 273 if (err) 274 return err; 275 276 err = -EINVAL; 277 mdev->common = vp_modern_map_capability(mdev, common, 278 sizeof(struct virtio_pci_common_cfg), 4, 279 0, sizeof(struct virtio_pci_common_cfg), 280 NULL, NULL); 281 if (!mdev->common) 282 goto err_map_common; 283 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1, 284 0, 1, 285 NULL, NULL); 286 if (!mdev->isr) 287 goto err_map_isr; 288 289 /* Read notify_off_multiplier from config space. */ 290 pci_read_config_dword(pci_dev, 291 notify + offsetof(struct virtio_pci_notify_cap, 292 notify_off_multiplier), 293 &mdev->notify_offset_multiplier); 294 /* Read notify length and offset from config space. */ 295 pci_read_config_dword(pci_dev, 296 notify + offsetof(struct virtio_pci_notify_cap, 297 cap.length), 298 ¬ify_length); 299 300 pci_read_config_dword(pci_dev, 301 notify + offsetof(struct virtio_pci_notify_cap, 302 cap.offset), 303 ¬ify_offset); 304 305 /* We don't know how many VQs we'll map, ahead of the time. 306 * If notify length is small, map it all now. 307 * Otherwise, map each VQ individually later. 308 */ 309 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { 310 mdev->notify_base = vp_modern_map_capability(mdev, notify, 311 2, 2, 312 0, notify_length, 313 &mdev->notify_len, 314 &mdev->notify_pa); 315 if (!mdev->notify_base) 316 goto err_map_notify; 317 } else { 318 mdev->notify_map_cap = notify; 319 } 320 321 /* Again, we don't know how much we should map, but PAGE_SIZE 322 * is more than enough for all existing devices. 323 */ 324 if (device) { 325 mdev->device = vp_modern_map_capability(mdev, device, 0, 4, 326 0, PAGE_SIZE, 327 &mdev->device_len, 328 NULL); 329 if (!mdev->device) 330 goto err_map_device; 331 } 332 333 return 0; 334 335 err_map_device: 336 if (mdev->notify_base) 337 pci_iounmap(pci_dev, mdev->notify_base); 338 err_map_notify: 339 pci_iounmap(pci_dev, mdev->isr); 340 err_map_isr: 341 pci_iounmap(pci_dev, mdev->common); 342 err_map_common: 343 return err; 344 } 345 EXPORT_SYMBOL_GPL(vp_modern_probe); 346 347 /* 348 * vp_modern_probe: remove and cleanup the modern virtio pci device 349 * @mdev: the modern virtio-pci device 350 */ 351 void vp_modern_remove(struct virtio_pci_modern_device *mdev) 352 { 353 struct pci_dev *pci_dev = mdev->pci_dev; 354 355 if (mdev->device) 356 pci_iounmap(pci_dev, mdev->device); 357 if (mdev->notify_base) 358 pci_iounmap(pci_dev, mdev->notify_base); 359 pci_iounmap(pci_dev, mdev->isr); 360 pci_iounmap(pci_dev, mdev->common); 361 pci_release_selected_regions(pci_dev, mdev->modern_bars); 362 } 363 EXPORT_SYMBOL_GPL(vp_modern_remove); 364 365 /* 366 * vp_modern_get_features - get features from device 367 * @mdev: the modern virtio-pci device 368 * 369 * Returns the features read from the device 370 */ 371 u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev) 372 { 373 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 374 375 u64 features; 376 377 vp_iowrite32(0, &cfg->device_feature_select); 378 features = vp_ioread32(&cfg->device_feature); 379 vp_iowrite32(1, &cfg->device_feature_select); 380 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32); 381 382 return features; 383 } 384 EXPORT_SYMBOL_GPL(vp_modern_get_features); 385 386 /* 387 * vp_modern_get_driver_features - get driver features from device 388 * @mdev: the modern virtio-pci device 389 * 390 * Returns the driver features read from the device 391 */ 392 u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev) 393 { 394 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 395 396 u64 features; 397 398 vp_iowrite32(0, &cfg->guest_feature_select); 399 features = vp_ioread32(&cfg->guest_feature); 400 vp_iowrite32(1, &cfg->guest_feature_select); 401 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32); 402 403 return features; 404 } 405 EXPORT_SYMBOL_GPL(vp_modern_get_driver_features); 406 407 /* 408 * vp_modern_set_features - set features to device 409 * @mdev: the modern virtio-pci device 410 * @features: the features set to device 411 */ 412 void vp_modern_set_features(struct virtio_pci_modern_device *mdev, 413 u64 features) 414 { 415 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 416 417 vp_iowrite32(0, &cfg->guest_feature_select); 418 vp_iowrite32((u32)features, &cfg->guest_feature); 419 vp_iowrite32(1, &cfg->guest_feature_select); 420 vp_iowrite32(features >> 32, &cfg->guest_feature); 421 } 422 EXPORT_SYMBOL_GPL(vp_modern_set_features); 423 424 /* 425 * vp_modern_generation - get the device genreation 426 * @mdev: the modern virtio-pci device 427 * 428 * Returns the genreation read from device 429 */ 430 u32 vp_modern_generation(struct virtio_pci_modern_device *mdev) 431 { 432 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 433 434 return vp_ioread8(&cfg->config_generation); 435 } 436 EXPORT_SYMBOL_GPL(vp_modern_generation); 437 438 /* 439 * vp_modern_get_status - get the device status 440 * @mdev: the modern virtio-pci device 441 * 442 * Returns the status read from device 443 */ 444 u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev) 445 { 446 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 447 448 return vp_ioread8(&cfg->device_status); 449 } 450 EXPORT_SYMBOL_GPL(vp_modern_get_status); 451 452 /* 453 * vp_modern_set_status - set status to device 454 * @mdev: the modern virtio-pci device 455 * @status: the status set to device 456 */ 457 void vp_modern_set_status(struct virtio_pci_modern_device *mdev, 458 u8 status) 459 { 460 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 461 462 vp_iowrite8(status, &cfg->device_status); 463 } 464 EXPORT_SYMBOL_GPL(vp_modern_set_status); 465 466 /* 467 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue 468 * @mdev: the modern virtio-pci device 469 * @index: queue index 470 * @vector: the config vector 471 * 472 * Returns the config vector read from the device 473 */ 474 u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev, 475 u16 index, u16 vector) 476 { 477 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 478 479 vp_iowrite16(index, &cfg->queue_select); 480 vp_iowrite16(vector, &cfg->queue_msix_vector); 481 /* Flush the write out to device */ 482 return vp_ioread16(&cfg->queue_msix_vector); 483 } 484 EXPORT_SYMBOL_GPL(vp_modern_queue_vector); 485 486 /* 487 * vp_modern_config_vector - set the vector for config interrupt 488 * @mdev: the modern virtio-pci device 489 * @vector: the config vector 490 * 491 * Returns the config vector read from the device 492 */ 493 u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev, 494 u16 vector) 495 { 496 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 497 498 /* Setup the vector used for configuration events */ 499 vp_iowrite16(vector, &cfg->msix_config); 500 /* Verify we had enough resources to assign the vector */ 501 /* Will also flush the write out to device */ 502 return vp_ioread16(&cfg->msix_config); 503 } 504 EXPORT_SYMBOL_GPL(vp_modern_config_vector); 505 506 /* 507 * vp_modern_queue_address - set the virtqueue address 508 * @mdev: the modern virtio-pci device 509 * @index: the queue index 510 * @desc_addr: address of the descriptor area 511 * @driver_addr: address of the driver area 512 * @device_addr: address of the device area 513 */ 514 void vp_modern_queue_address(struct virtio_pci_modern_device *mdev, 515 u16 index, u64 desc_addr, u64 driver_addr, 516 u64 device_addr) 517 { 518 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 519 520 vp_iowrite16(index, &cfg->queue_select); 521 522 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo, 523 &cfg->queue_desc_hi); 524 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo, 525 &cfg->queue_avail_hi); 526 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo, 527 &cfg->queue_used_hi); 528 } 529 EXPORT_SYMBOL_GPL(vp_modern_queue_address); 530 531 /* 532 * vp_modern_set_queue_enable - enable a virtqueue 533 * @mdev: the modern virtio-pci device 534 * @index: the queue index 535 * @enable: whether the virtqueue is enable or not 536 */ 537 void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev, 538 u16 index, bool enable) 539 { 540 vp_iowrite16(index, &mdev->common->queue_select); 541 vp_iowrite16(enable, &mdev->common->queue_enable); 542 } 543 EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable); 544 545 /* 546 * vp_modern_get_queue_enable - enable a virtqueue 547 * @mdev: the modern virtio-pci device 548 * @index: the queue index 549 * 550 * Returns whether a virtqueue is enabled or not 551 */ 552 bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, 553 u16 index) 554 { 555 vp_iowrite16(index, &mdev->common->queue_select); 556 557 return vp_ioread16(&mdev->common->queue_enable); 558 } 559 EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable); 560 561 /* 562 * vp_modern_set_queue_size - set size for a virtqueue 563 * @mdev: the modern virtio-pci device 564 * @index: the queue index 565 * @size: the size of the virtqueue 566 */ 567 void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, 568 u16 index, u16 size) 569 { 570 vp_iowrite16(index, &mdev->common->queue_select); 571 vp_iowrite16(size, &mdev->common->queue_size); 572 573 } 574 EXPORT_SYMBOL_GPL(vp_modern_set_queue_size); 575 576 /* 577 * vp_modern_get_queue_size - get size for a virtqueue 578 * @mdev: the modern virtio-pci device 579 * @index: the queue index 580 * 581 * Returns the size of the virtqueue 582 */ 583 u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev, 584 u16 index) 585 { 586 vp_iowrite16(index, &mdev->common->queue_select); 587 588 return vp_ioread16(&mdev->common->queue_size); 589 590 } 591 EXPORT_SYMBOL_GPL(vp_modern_get_queue_size); 592 593 /* 594 * vp_modern_get_num_queues - get the number of virtqueues 595 * @mdev: the modern virtio-pci device 596 * 597 * Returns the number of virtqueues 598 */ 599 u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev) 600 { 601 return vp_ioread16(&mdev->common->num_queues); 602 } 603 EXPORT_SYMBOL_GPL(vp_modern_get_num_queues); 604 605 /* 606 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue 607 * @mdev: the modern virtio-pci device 608 * @index: the queue index 609 * 610 * Returns the notification offset for a virtqueue 611 */ 612 static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev, 613 u16 index) 614 { 615 vp_iowrite16(index, &mdev->common->queue_select); 616 617 return vp_ioread16(&mdev->common->queue_notify_off); 618 } 619 620 /* 621 * vp_modern_map_vq_notify - map notification area for a 622 * specific virtqueue 623 * @mdev: the modern virtio-pci device 624 * @index: the queue index 625 * @pa: the pointer to the physical address of the nofity area 626 * 627 * Returns the address of the notification area 628 */ 629 void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev, 630 u16 index, resource_size_t *pa) 631 { 632 u16 off = vp_modern_get_queue_notify_off(mdev, index); 633 634 if (mdev->notify_base) { 635 /* offset should not wrap */ 636 if ((u64)off * mdev->notify_offset_multiplier + 2 637 > mdev->notify_len) { 638 dev_warn(&mdev->pci_dev->dev, 639 "bad notification offset %u (x %u) " 640 "for queue %u > %zd", 641 off, mdev->notify_offset_multiplier, 642 index, mdev->notify_len); 643 return NULL; 644 } 645 if (pa) 646 *pa = mdev->notify_pa + 647 off * mdev->notify_offset_multiplier; 648 return mdev->notify_base + off * mdev->notify_offset_multiplier; 649 } else { 650 return vp_modern_map_capability(mdev, 651 mdev->notify_map_cap, 2, 2, 652 off * mdev->notify_offset_multiplier, 2, 653 NULL, pa); 654 } 655 } 656 EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify); 657 658 MODULE_VERSION("0.1"); 659 MODULE_DESCRIPTION("Modern Virtio PCI Device"); 660 MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); 661 MODULE_LICENSE("GPL"); 662