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 #include <linux/delay.h> 7 8 /* 9 * vp_modern_map_capability - map a part of virtio pci capability 10 * @mdev: the modern virtio-pci device 11 * @off: offset of the capability 12 * @minlen: minimal length of the capability 13 * @align: align requirement 14 * @start: start from the capability 15 * @size: map size 16 * @len: the length that is actually mapped 17 * @pa: physical address of the capability 18 * 19 * Returns the io address of for the part of the capability 20 */ 21 static void __iomem * 22 vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off, 23 size_t minlen, u32 align, u32 start, u32 size, 24 size_t *len, resource_size_t *pa) 25 { 26 struct pci_dev *dev = mdev->pci_dev; 27 u8 bar; 28 u32 offset, length; 29 void __iomem *p; 30 31 pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap, 32 bar), 33 &bar); 34 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset), 35 &offset); 36 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length), 37 &length); 38 39 /* Check if the BAR may have changed since we requested the region. */ 40 if (bar >= PCI_STD_NUM_BARS || !(mdev->modern_bars & (1 << bar))) { 41 dev_err(&dev->dev, 42 "virtio_pci: bar unexpectedly changed to %u\n", bar); 43 return NULL; 44 } 45 46 if (length <= start) { 47 dev_err(&dev->dev, 48 "virtio_pci: bad capability len %u (>%u expected)\n", 49 length, start); 50 return NULL; 51 } 52 53 if (length - start < minlen) { 54 dev_err(&dev->dev, 55 "virtio_pci: bad capability len %u (>=%zu expected)\n", 56 length, minlen); 57 return NULL; 58 } 59 60 length -= start; 61 62 if (start + offset < offset) { 63 dev_err(&dev->dev, 64 "virtio_pci: map wrap-around %u+%u\n", 65 start, offset); 66 return NULL; 67 } 68 69 offset += start; 70 71 if (offset & (align - 1)) { 72 dev_err(&dev->dev, 73 "virtio_pci: offset %u not aligned to %u\n", 74 offset, align); 75 return NULL; 76 } 77 78 if (length > size) 79 length = size; 80 81 if (len) 82 *len = length; 83 84 if (minlen + offset < minlen || 85 minlen + offset > pci_resource_len(dev, bar)) { 86 dev_err(&dev->dev, 87 "virtio_pci: map virtio %zu@%u " 88 "out of range on bar %i length %lu\n", 89 minlen, offset, 90 bar, (unsigned long)pci_resource_len(dev, bar)); 91 return NULL; 92 } 93 94 p = pci_iomap_range(dev, bar, offset, length); 95 if (!p) 96 dev_err(&dev->dev, 97 "virtio_pci: unable to map virtio %u@%u on bar %i\n", 98 length, offset, bar); 99 else if (pa) 100 *pa = pci_resource_start(dev, bar) + offset; 101 102 return p; 103 } 104 105 /** 106 * virtio_pci_find_capability - walk capabilities to find device info. 107 * @dev: the pci device 108 * @cfg_type: the VIRTIO_PCI_CAP_* value we seek 109 * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO. 110 * @bars: the bitmask of BARs 111 * 112 * Returns offset of the capability, or 0. 113 */ 114 static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type, 115 u32 ioresource_types, int *bars) 116 { 117 int pos; 118 119 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); 120 pos > 0; 121 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { 122 u8 type, bar; 123 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 124 cfg_type), 125 &type); 126 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, 127 bar), 128 &bar); 129 130 /* Ignore structures with reserved BAR values */ 131 if (bar >= PCI_STD_NUM_BARS) 132 continue; 133 134 if (type == cfg_type) { 135 if (pci_resource_len(dev, bar) && 136 pci_resource_flags(dev, bar) & ioresource_types) { 137 *bars |= (1 << bar); 138 return pos; 139 } 140 } 141 } 142 return 0; 143 } 144 145 /* This is part of the ABI. Don't screw with it. */ 146 static inline void check_offsets(void) 147 { 148 /* Note: disk space was harmed in compilation of this function. */ 149 BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR != 150 offsetof(struct virtio_pci_cap, cap_vndr)); 151 BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT != 152 offsetof(struct virtio_pci_cap, cap_next)); 153 BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN != 154 offsetof(struct virtio_pci_cap, cap_len)); 155 BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE != 156 offsetof(struct virtio_pci_cap, cfg_type)); 157 BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR != 158 offsetof(struct virtio_pci_cap, bar)); 159 BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET != 160 offsetof(struct virtio_pci_cap, offset)); 161 BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH != 162 offsetof(struct virtio_pci_cap, length)); 163 BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT != 164 offsetof(struct virtio_pci_notify_cap, 165 notify_off_multiplier)); 166 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT != 167 offsetof(struct virtio_pci_common_cfg, 168 device_feature_select)); 169 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF != 170 offsetof(struct virtio_pci_common_cfg, device_feature)); 171 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT != 172 offsetof(struct virtio_pci_common_cfg, 173 guest_feature_select)); 174 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF != 175 offsetof(struct virtio_pci_common_cfg, guest_feature)); 176 BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX != 177 offsetof(struct virtio_pci_common_cfg, msix_config)); 178 BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ != 179 offsetof(struct virtio_pci_common_cfg, num_queues)); 180 BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS != 181 offsetof(struct virtio_pci_common_cfg, device_status)); 182 BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION != 183 offsetof(struct virtio_pci_common_cfg, config_generation)); 184 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT != 185 offsetof(struct virtio_pci_common_cfg, queue_select)); 186 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE != 187 offsetof(struct virtio_pci_common_cfg, queue_size)); 188 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX != 189 offsetof(struct virtio_pci_common_cfg, queue_msix_vector)); 190 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE != 191 offsetof(struct virtio_pci_common_cfg, queue_enable)); 192 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF != 193 offsetof(struct virtio_pci_common_cfg, queue_notify_off)); 194 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO != 195 offsetof(struct virtio_pci_common_cfg, queue_desc_lo)); 196 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI != 197 offsetof(struct virtio_pci_common_cfg, queue_desc_hi)); 198 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO != 199 offsetof(struct virtio_pci_common_cfg, queue_avail_lo)); 200 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI != 201 offsetof(struct virtio_pci_common_cfg, queue_avail_hi)); 202 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO != 203 offsetof(struct virtio_pci_common_cfg, queue_used_lo)); 204 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI != 205 offsetof(struct virtio_pci_common_cfg, queue_used_hi)); 206 } 207 208 /* 209 * vp_modern_probe: probe the modern virtio pci device, note that the 210 * caller is required to enable PCI device before calling this function. 211 * @mdev: the modern virtio-pci device 212 * 213 * Return 0 on succeed otherwise fail 214 */ 215 int vp_modern_probe(struct virtio_pci_modern_device *mdev) 216 { 217 struct pci_dev *pci_dev = mdev->pci_dev; 218 int err, common, isr, notify, device; 219 u32 notify_length; 220 u32 notify_offset; 221 222 check_offsets(); 223 224 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ 225 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) 226 return -ENODEV; 227 228 if (pci_dev->device < 0x1040) { 229 /* Transitional devices: use the PCI subsystem device id as 230 * virtio device id, same as legacy driver always did. 231 */ 232 mdev->id.device = pci_dev->subsystem_device; 233 } else { 234 /* Modern devices: simply use PCI device id, but start from 0x1040. */ 235 mdev->id.device = pci_dev->device - 0x1040; 236 } 237 mdev->id.vendor = pci_dev->subsystem_vendor; 238 239 /* check for a common config: if not, use legacy mode (bar 0). */ 240 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, 241 IORESOURCE_IO | IORESOURCE_MEM, 242 &mdev->modern_bars); 243 if (!common) { 244 dev_info(&pci_dev->dev, 245 "virtio_pci: leaving for legacy driver\n"); 246 return -ENODEV; 247 } 248 249 /* If common is there, these should be too... */ 250 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, 251 IORESOURCE_IO | IORESOURCE_MEM, 252 &mdev->modern_bars); 253 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, 254 IORESOURCE_IO | IORESOURCE_MEM, 255 &mdev->modern_bars); 256 if (!isr || !notify) { 257 dev_err(&pci_dev->dev, 258 "virtio_pci: missing capabilities %i/%i/%i\n", 259 common, isr, notify); 260 return -EINVAL; 261 } 262 263 err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64)); 264 if (err) 265 err = dma_set_mask_and_coherent(&pci_dev->dev, 266 DMA_BIT_MASK(32)); 267 if (err) 268 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); 269 270 /* Device capability is only mandatory for devices that have 271 * device-specific configuration. 272 */ 273 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, 274 IORESOURCE_IO | IORESOURCE_MEM, 275 &mdev->modern_bars); 276 277 err = pci_request_selected_regions(pci_dev, mdev->modern_bars, 278 "virtio-pci-modern"); 279 if (err) 280 return err; 281 282 err = -EINVAL; 283 mdev->common = vp_modern_map_capability(mdev, common, 284 sizeof(struct virtio_pci_common_cfg), 4, 285 0, sizeof(struct virtio_pci_common_cfg), 286 NULL, NULL); 287 if (!mdev->common) 288 goto err_map_common; 289 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1, 290 0, 1, 291 NULL, NULL); 292 if (!mdev->isr) 293 goto err_map_isr; 294 295 /* Read notify_off_multiplier from config space. */ 296 pci_read_config_dword(pci_dev, 297 notify + offsetof(struct virtio_pci_notify_cap, 298 notify_off_multiplier), 299 &mdev->notify_offset_multiplier); 300 /* Read notify length and offset from config space. */ 301 pci_read_config_dword(pci_dev, 302 notify + offsetof(struct virtio_pci_notify_cap, 303 cap.length), 304 ¬ify_length); 305 306 pci_read_config_dword(pci_dev, 307 notify + offsetof(struct virtio_pci_notify_cap, 308 cap.offset), 309 ¬ify_offset); 310 311 /* We don't know how many VQs we'll map, ahead of the time. 312 * If notify length is small, map it all now. 313 * Otherwise, map each VQ individually later. 314 */ 315 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { 316 mdev->notify_base = vp_modern_map_capability(mdev, notify, 317 2, 2, 318 0, notify_length, 319 &mdev->notify_len, 320 &mdev->notify_pa); 321 if (!mdev->notify_base) 322 goto err_map_notify; 323 } else { 324 mdev->notify_map_cap = notify; 325 } 326 327 /* Again, we don't know how much we should map, but PAGE_SIZE 328 * is more than enough for all existing devices. 329 */ 330 if (device) { 331 mdev->device = vp_modern_map_capability(mdev, device, 0, 4, 332 0, PAGE_SIZE, 333 &mdev->device_len, 334 NULL); 335 if (!mdev->device) 336 goto err_map_device; 337 } 338 339 return 0; 340 341 err_map_device: 342 if (mdev->notify_base) 343 pci_iounmap(pci_dev, mdev->notify_base); 344 err_map_notify: 345 pci_iounmap(pci_dev, mdev->isr); 346 err_map_isr: 347 pci_iounmap(pci_dev, mdev->common); 348 err_map_common: 349 pci_release_selected_regions(pci_dev, mdev->modern_bars); 350 return err; 351 } 352 EXPORT_SYMBOL_GPL(vp_modern_probe); 353 354 /* 355 * vp_modern_remove: remove and cleanup the modern virtio pci device 356 * @mdev: the modern virtio-pci device 357 */ 358 void vp_modern_remove(struct virtio_pci_modern_device *mdev) 359 { 360 struct pci_dev *pci_dev = mdev->pci_dev; 361 362 if (mdev->device) 363 pci_iounmap(pci_dev, mdev->device); 364 if (mdev->notify_base) 365 pci_iounmap(pci_dev, mdev->notify_base); 366 pci_iounmap(pci_dev, mdev->isr); 367 pci_iounmap(pci_dev, mdev->common); 368 pci_release_selected_regions(pci_dev, mdev->modern_bars); 369 } 370 EXPORT_SYMBOL_GPL(vp_modern_remove); 371 372 /* 373 * vp_modern_get_features - get features from device 374 * @mdev: the modern virtio-pci device 375 * 376 * Returns the features read from the device 377 */ 378 u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev) 379 { 380 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 381 382 u64 features; 383 384 vp_iowrite32(0, &cfg->device_feature_select); 385 features = vp_ioread32(&cfg->device_feature); 386 vp_iowrite32(1, &cfg->device_feature_select); 387 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32); 388 389 return features; 390 } 391 EXPORT_SYMBOL_GPL(vp_modern_get_features); 392 393 /* 394 * vp_modern_get_driver_features - get driver features from device 395 * @mdev: the modern virtio-pci device 396 * 397 * Returns the driver features read from the device 398 */ 399 u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev) 400 { 401 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 402 403 u64 features; 404 405 vp_iowrite32(0, &cfg->guest_feature_select); 406 features = vp_ioread32(&cfg->guest_feature); 407 vp_iowrite32(1, &cfg->guest_feature_select); 408 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32); 409 410 return features; 411 } 412 EXPORT_SYMBOL_GPL(vp_modern_get_driver_features); 413 414 /* 415 * vp_modern_set_features - set features to device 416 * @mdev: the modern virtio-pci device 417 * @features: the features set to device 418 */ 419 void vp_modern_set_features(struct virtio_pci_modern_device *mdev, 420 u64 features) 421 { 422 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 423 424 vp_iowrite32(0, &cfg->guest_feature_select); 425 vp_iowrite32((u32)features, &cfg->guest_feature); 426 vp_iowrite32(1, &cfg->guest_feature_select); 427 vp_iowrite32(features >> 32, &cfg->guest_feature); 428 } 429 EXPORT_SYMBOL_GPL(vp_modern_set_features); 430 431 /* 432 * vp_modern_generation - get the device genreation 433 * @mdev: the modern virtio-pci device 434 * 435 * Returns the genreation read from device 436 */ 437 u32 vp_modern_generation(struct virtio_pci_modern_device *mdev) 438 { 439 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 440 441 return vp_ioread8(&cfg->config_generation); 442 } 443 EXPORT_SYMBOL_GPL(vp_modern_generation); 444 445 /* 446 * vp_modern_get_status - get the device status 447 * @mdev: the modern virtio-pci device 448 * 449 * Returns the status read from device 450 */ 451 u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev) 452 { 453 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 454 455 return vp_ioread8(&cfg->device_status); 456 } 457 EXPORT_SYMBOL_GPL(vp_modern_get_status); 458 459 /* 460 * vp_modern_set_status - set status to device 461 * @mdev: the modern virtio-pci device 462 * @status: the status set to device 463 */ 464 void vp_modern_set_status(struct virtio_pci_modern_device *mdev, 465 u8 status) 466 { 467 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 468 469 /* 470 * Per memory-barriers.txt, wmb() is not needed to guarantee 471 * that the cache coherent memory writes have completed 472 * before writing to the MMIO region. 473 */ 474 vp_iowrite8(status, &cfg->device_status); 475 } 476 EXPORT_SYMBOL_GPL(vp_modern_set_status); 477 478 /* 479 * vp_modern_get_queue_reset - get the queue reset status 480 * @mdev: the modern virtio-pci device 481 * @index: queue index 482 */ 483 int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 484 { 485 struct virtio_pci_modern_common_cfg __iomem *cfg; 486 487 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 488 489 vp_iowrite16(index, &cfg->cfg.queue_select); 490 return vp_ioread16(&cfg->queue_reset); 491 } 492 EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset); 493 494 /* 495 * vp_modern_set_queue_reset - reset the queue 496 * @mdev: the modern virtio-pci device 497 * @index: queue index 498 */ 499 void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 500 { 501 struct virtio_pci_modern_common_cfg __iomem *cfg; 502 503 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 504 505 vp_iowrite16(index, &cfg->cfg.queue_select); 506 vp_iowrite16(1, &cfg->queue_reset); 507 508 while (vp_ioread16(&cfg->queue_reset)) 509 msleep(1); 510 511 while (vp_ioread16(&cfg->cfg.queue_enable)) 512 msleep(1); 513 } 514 EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset); 515 516 /* 517 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue 518 * @mdev: the modern virtio-pci device 519 * @index: queue index 520 * @vector: the config vector 521 * 522 * Returns the config vector read from the device 523 */ 524 u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev, 525 u16 index, u16 vector) 526 { 527 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 528 529 vp_iowrite16(index, &cfg->queue_select); 530 vp_iowrite16(vector, &cfg->queue_msix_vector); 531 /* Flush the write out to device */ 532 return vp_ioread16(&cfg->queue_msix_vector); 533 } 534 EXPORT_SYMBOL_GPL(vp_modern_queue_vector); 535 536 /* 537 * vp_modern_config_vector - set the vector for config interrupt 538 * @mdev: the modern virtio-pci device 539 * @vector: the config vector 540 * 541 * Returns the config vector read from the device 542 */ 543 u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev, 544 u16 vector) 545 { 546 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 547 548 /* Setup the vector used for configuration events */ 549 vp_iowrite16(vector, &cfg->msix_config); 550 /* Verify we had enough resources to assign the vector */ 551 /* Will also flush the write out to device */ 552 return vp_ioread16(&cfg->msix_config); 553 } 554 EXPORT_SYMBOL_GPL(vp_modern_config_vector); 555 556 /* 557 * vp_modern_queue_address - set the virtqueue address 558 * @mdev: the modern virtio-pci device 559 * @index: the queue index 560 * @desc_addr: address of the descriptor area 561 * @driver_addr: address of the driver area 562 * @device_addr: address of the device area 563 */ 564 void vp_modern_queue_address(struct virtio_pci_modern_device *mdev, 565 u16 index, u64 desc_addr, u64 driver_addr, 566 u64 device_addr) 567 { 568 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 569 570 vp_iowrite16(index, &cfg->queue_select); 571 572 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo, 573 &cfg->queue_desc_hi); 574 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo, 575 &cfg->queue_avail_hi); 576 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo, 577 &cfg->queue_used_hi); 578 } 579 EXPORT_SYMBOL_GPL(vp_modern_queue_address); 580 581 /* 582 * vp_modern_set_queue_enable - enable a virtqueue 583 * @mdev: the modern virtio-pci device 584 * @index: the queue index 585 * @enable: whether the virtqueue is enable or not 586 */ 587 void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev, 588 u16 index, bool enable) 589 { 590 vp_iowrite16(index, &mdev->common->queue_select); 591 vp_iowrite16(enable, &mdev->common->queue_enable); 592 } 593 EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable); 594 595 /* 596 * vp_modern_get_queue_enable - enable a virtqueue 597 * @mdev: the modern virtio-pci device 598 * @index: the queue index 599 * 600 * Returns whether a virtqueue is enabled or not 601 */ 602 bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, 603 u16 index) 604 { 605 vp_iowrite16(index, &mdev->common->queue_select); 606 607 return vp_ioread16(&mdev->common->queue_enable); 608 } 609 EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable); 610 611 /* 612 * vp_modern_set_queue_size - set size for a virtqueue 613 * @mdev: the modern virtio-pci device 614 * @index: the queue index 615 * @size: the size of the virtqueue 616 */ 617 void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, 618 u16 index, u16 size) 619 { 620 vp_iowrite16(index, &mdev->common->queue_select); 621 vp_iowrite16(size, &mdev->common->queue_size); 622 623 } 624 EXPORT_SYMBOL_GPL(vp_modern_set_queue_size); 625 626 /* 627 * vp_modern_get_queue_size - get size for a virtqueue 628 * @mdev: the modern virtio-pci device 629 * @index: the queue index 630 * 631 * Returns the size of the virtqueue 632 */ 633 u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev, 634 u16 index) 635 { 636 vp_iowrite16(index, &mdev->common->queue_select); 637 638 return vp_ioread16(&mdev->common->queue_size); 639 640 } 641 EXPORT_SYMBOL_GPL(vp_modern_get_queue_size); 642 643 /* 644 * vp_modern_get_num_queues - get the number of virtqueues 645 * @mdev: the modern virtio-pci device 646 * 647 * Returns the number of virtqueues 648 */ 649 u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev) 650 { 651 return vp_ioread16(&mdev->common->num_queues); 652 } 653 EXPORT_SYMBOL_GPL(vp_modern_get_num_queues); 654 655 /* 656 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue 657 * @mdev: the modern virtio-pci device 658 * @index: the queue index 659 * 660 * Returns the notification offset for a virtqueue 661 */ 662 static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev, 663 u16 index) 664 { 665 vp_iowrite16(index, &mdev->common->queue_select); 666 667 return vp_ioread16(&mdev->common->queue_notify_off); 668 } 669 670 /* 671 * vp_modern_map_vq_notify - map notification area for a 672 * specific virtqueue 673 * @mdev: the modern virtio-pci device 674 * @index: the queue index 675 * @pa: the pointer to the physical address of the nofity area 676 * 677 * Returns the address of the notification area 678 */ 679 void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev, 680 u16 index, resource_size_t *pa) 681 { 682 u16 off = vp_modern_get_queue_notify_off(mdev, index); 683 684 if (mdev->notify_base) { 685 /* offset should not wrap */ 686 if ((u64)off * mdev->notify_offset_multiplier + 2 687 > mdev->notify_len) { 688 dev_warn(&mdev->pci_dev->dev, 689 "bad notification offset %u (x %u) " 690 "for queue %u > %zd", 691 off, mdev->notify_offset_multiplier, 692 index, mdev->notify_len); 693 return NULL; 694 } 695 if (pa) 696 *pa = mdev->notify_pa + 697 off * mdev->notify_offset_multiplier; 698 return mdev->notify_base + off * mdev->notify_offset_multiplier; 699 } else { 700 return vp_modern_map_capability(mdev, 701 mdev->notify_map_cap, 2, 2, 702 off * mdev->notify_offset_multiplier, 2, 703 NULL, pa); 704 } 705 } 706 EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify); 707 708 MODULE_VERSION("0.1"); 709 MODULE_DESCRIPTION("Modern Virtio PCI Device"); 710 MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); 711 MODULE_LICENSE("GPL"); 712