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 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NDATA != 207 offsetof(struct virtio_pci_modern_common_cfg, queue_notify_data)); 208 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_RESET != 209 offsetof(struct virtio_pci_modern_common_cfg, queue_reset)); 210 } 211 212 /* 213 * vp_modern_probe: probe the modern virtio pci device, note that the 214 * caller is required to enable PCI device before calling this function. 215 * @mdev: the modern virtio-pci device 216 * 217 * Return 0 on succeed otherwise fail 218 */ 219 int vp_modern_probe(struct virtio_pci_modern_device *mdev) 220 { 221 struct pci_dev *pci_dev = mdev->pci_dev; 222 int err, common, isr, notify, device; 223 u32 notify_length; 224 u32 notify_offset; 225 int devid; 226 227 check_offsets(); 228 229 if (mdev->device_id_check) { 230 devid = mdev->device_id_check(pci_dev); 231 if (devid < 0) 232 return devid; 233 mdev->id.device = devid; 234 } else { 235 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ 236 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) 237 return -ENODEV; 238 239 if (pci_dev->device < 0x1040) { 240 /* Transitional devices: use the PCI subsystem device id as 241 * virtio device id, same as legacy driver always did. 242 */ 243 mdev->id.device = pci_dev->subsystem_device; 244 } else { 245 /* Modern devices: simply use PCI device id, but start from 0x1040. */ 246 mdev->id.device = pci_dev->device - 0x1040; 247 } 248 } 249 mdev->id.vendor = pci_dev->subsystem_vendor; 250 251 /* check for a common config: if not, use legacy mode (bar 0). */ 252 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, 253 IORESOURCE_IO | IORESOURCE_MEM, 254 &mdev->modern_bars); 255 if (!common) { 256 dev_info(&pci_dev->dev, 257 "virtio_pci: leaving for legacy driver\n"); 258 return -ENODEV; 259 } 260 261 /* If common is there, these should be too... */ 262 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, 263 IORESOURCE_IO | IORESOURCE_MEM, 264 &mdev->modern_bars); 265 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, 266 IORESOURCE_IO | IORESOURCE_MEM, 267 &mdev->modern_bars); 268 if (!isr || !notify) { 269 dev_err(&pci_dev->dev, 270 "virtio_pci: missing capabilities %i/%i/%i\n", 271 common, isr, notify); 272 return -EINVAL; 273 } 274 275 err = dma_set_mask_and_coherent(&pci_dev->dev, 276 mdev->dma_mask ? : DMA_BIT_MASK(64)); 277 if (err) 278 err = dma_set_mask_and_coherent(&pci_dev->dev, 279 DMA_BIT_MASK(32)); 280 if (err) 281 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); 282 283 /* Device capability is only mandatory for devices that have 284 * device-specific configuration. 285 */ 286 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, 287 IORESOURCE_IO | IORESOURCE_MEM, 288 &mdev->modern_bars); 289 290 err = pci_request_selected_regions(pci_dev, mdev->modern_bars, 291 "virtio-pci-modern"); 292 if (err) 293 return err; 294 295 err = -EINVAL; 296 mdev->common = vp_modern_map_capability(mdev, common, 297 sizeof(struct virtio_pci_common_cfg), 4, 0, 298 offsetofend(struct virtio_pci_modern_common_cfg, 299 queue_reset), 300 &mdev->common_len, NULL); 301 if (!mdev->common) 302 goto err_map_common; 303 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1, 304 0, 1, 305 NULL, NULL); 306 if (!mdev->isr) 307 goto err_map_isr; 308 309 /* Read notify_off_multiplier from config space. */ 310 pci_read_config_dword(pci_dev, 311 notify + offsetof(struct virtio_pci_notify_cap, 312 notify_off_multiplier), 313 &mdev->notify_offset_multiplier); 314 /* Read notify length and offset from config space. */ 315 pci_read_config_dword(pci_dev, 316 notify + offsetof(struct virtio_pci_notify_cap, 317 cap.length), 318 ¬ify_length); 319 320 pci_read_config_dword(pci_dev, 321 notify + offsetof(struct virtio_pci_notify_cap, 322 cap.offset), 323 ¬ify_offset); 324 325 /* We don't know how many VQs we'll map, ahead of the time. 326 * If notify length is small, map it all now. 327 * Otherwise, map each VQ individually later. 328 */ 329 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { 330 mdev->notify_base = vp_modern_map_capability(mdev, notify, 331 2, 2, 332 0, notify_length, 333 &mdev->notify_len, 334 &mdev->notify_pa); 335 if (!mdev->notify_base) 336 goto err_map_notify; 337 } else { 338 mdev->notify_map_cap = notify; 339 } 340 341 /* Again, we don't know how much we should map, but PAGE_SIZE 342 * is more than enough for all existing devices. 343 */ 344 if (device) { 345 mdev->device = vp_modern_map_capability(mdev, device, 0, 4, 346 0, PAGE_SIZE, 347 &mdev->device_len, 348 NULL); 349 if (!mdev->device) 350 goto err_map_device; 351 } 352 353 return 0; 354 355 err_map_device: 356 if (mdev->notify_base) 357 pci_iounmap(pci_dev, mdev->notify_base); 358 err_map_notify: 359 pci_iounmap(pci_dev, mdev->isr); 360 err_map_isr: 361 pci_iounmap(pci_dev, mdev->common); 362 err_map_common: 363 pci_release_selected_regions(pci_dev, mdev->modern_bars); 364 return err; 365 } 366 EXPORT_SYMBOL_GPL(vp_modern_probe); 367 368 /* 369 * vp_modern_remove: remove and cleanup the modern virtio pci device 370 * @mdev: the modern virtio-pci device 371 */ 372 void vp_modern_remove(struct virtio_pci_modern_device *mdev) 373 { 374 struct pci_dev *pci_dev = mdev->pci_dev; 375 376 if (mdev->device) 377 pci_iounmap(pci_dev, mdev->device); 378 if (mdev->notify_base) 379 pci_iounmap(pci_dev, mdev->notify_base); 380 pci_iounmap(pci_dev, mdev->isr); 381 pci_iounmap(pci_dev, mdev->common); 382 pci_release_selected_regions(pci_dev, mdev->modern_bars); 383 } 384 EXPORT_SYMBOL_GPL(vp_modern_remove); 385 386 /* 387 * vp_modern_get_features - get features from device 388 * @mdev: the modern virtio-pci device 389 * 390 * Returns the features read from the device 391 */ 392 u64 vp_modern_get_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->device_feature_select); 399 features = vp_ioread32(&cfg->device_feature); 400 vp_iowrite32(1, &cfg->device_feature_select); 401 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32); 402 403 return features; 404 } 405 EXPORT_SYMBOL_GPL(vp_modern_get_features); 406 407 /* 408 * vp_modern_get_driver_features - get driver features from device 409 * @mdev: the modern virtio-pci device 410 * 411 * Returns the driver features read from the device 412 */ 413 u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev) 414 { 415 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 416 417 u64 features; 418 419 vp_iowrite32(0, &cfg->guest_feature_select); 420 features = vp_ioread32(&cfg->guest_feature); 421 vp_iowrite32(1, &cfg->guest_feature_select); 422 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32); 423 424 return features; 425 } 426 EXPORT_SYMBOL_GPL(vp_modern_get_driver_features); 427 428 /* 429 * vp_modern_set_features - set features to device 430 * @mdev: the modern virtio-pci device 431 * @features: the features set to device 432 */ 433 void vp_modern_set_features(struct virtio_pci_modern_device *mdev, 434 u64 features) 435 { 436 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 437 438 vp_iowrite32(0, &cfg->guest_feature_select); 439 vp_iowrite32((u32)features, &cfg->guest_feature); 440 vp_iowrite32(1, &cfg->guest_feature_select); 441 vp_iowrite32(features >> 32, &cfg->guest_feature); 442 } 443 EXPORT_SYMBOL_GPL(vp_modern_set_features); 444 445 /* 446 * vp_modern_generation - get the device genreation 447 * @mdev: the modern virtio-pci device 448 * 449 * Returns the genreation read from device 450 */ 451 u32 vp_modern_generation(struct virtio_pci_modern_device *mdev) 452 { 453 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 454 455 return vp_ioread8(&cfg->config_generation); 456 } 457 EXPORT_SYMBOL_GPL(vp_modern_generation); 458 459 /* 460 * vp_modern_get_status - get the device status 461 * @mdev: the modern virtio-pci device 462 * 463 * Returns the status read from device 464 */ 465 u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev) 466 { 467 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 468 469 return vp_ioread8(&cfg->device_status); 470 } 471 EXPORT_SYMBOL_GPL(vp_modern_get_status); 472 473 /* 474 * vp_modern_set_status - set status to device 475 * @mdev: the modern virtio-pci device 476 * @status: the status set to device 477 */ 478 void vp_modern_set_status(struct virtio_pci_modern_device *mdev, 479 u8 status) 480 { 481 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 482 483 /* 484 * Per memory-barriers.txt, wmb() is not needed to guarantee 485 * that the cache coherent memory writes have completed 486 * before writing to the MMIO region. 487 */ 488 vp_iowrite8(status, &cfg->device_status); 489 } 490 EXPORT_SYMBOL_GPL(vp_modern_set_status); 491 492 /* 493 * vp_modern_get_queue_reset - get the queue reset status 494 * @mdev: the modern virtio-pci device 495 * @index: queue index 496 */ 497 int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 498 { 499 struct virtio_pci_modern_common_cfg __iomem *cfg; 500 501 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 502 503 vp_iowrite16(index, &cfg->cfg.queue_select); 504 return vp_ioread16(&cfg->queue_reset); 505 } 506 EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset); 507 508 /* 509 * vp_modern_set_queue_reset - reset the queue 510 * @mdev: the modern virtio-pci device 511 * @index: queue index 512 */ 513 void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 514 { 515 struct virtio_pci_modern_common_cfg __iomem *cfg; 516 517 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 518 519 vp_iowrite16(index, &cfg->cfg.queue_select); 520 vp_iowrite16(1, &cfg->queue_reset); 521 522 while (vp_ioread16(&cfg->queue_reset)) 523 msleep(1); 524 525 while (vp_ioread16(&cfg->cfg.queue_enable)) 526 msleep(1); 527 } 528 EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset); 529 530 /* 531 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue 532 * @mdev: the modern virtio-pci device 533 * @index: queue index 534 * @vector: the config vector 535 * 536 * Returns the config vector read from the device 537 */ 538 u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev, 539 u16 index, u16 vector) 540 { 541 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 542 543 vp_iowrite16(index, &cfg->queue_select); 544 vp_iowrite16(vector, &cfg->queue_msix_vector); 545 /* Flush the write out to device */ 546 return vp_ioread16(&cfg->queue_msix_vector); 547 } 548 EXPORT_SYMBOL_GPL(vp_modern_queue_vector); 549 550 /* 551 * vp_modern_config_vector - set the vector for config interrupt 552 * @mdev: the modern virtio-pci device 553 * @vector: the config vector 554 * 555 * Returns the config vector read from the device 556 */ 557 u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev, 558 u16 vector) 559 { 560 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 561 562 /* Setup the vector used for configuration events */ 563 vp_iowrite16(vector, &cfg->msix_config); 564 /* Verify we had enough resources to assign the vector */ 565 /* Will also flush the write out to device */ 566 return vp_ioread16(&cfg->msix_config); 567 } 568 EXPORT_SYMBOL_GPL(vp_modern_config_vector); 569 570 /* 571 * vp_modern_queue_address - set the virtqueue address 572 * @mdev: the modern virtio-pci device 573 * @index: the queue index 574 * @desc_addr: address of the descriptor area 575 * @driver_addr: address of the driver area 576 * @device_addr: address of the device area 577 */ 578 void vp_modern_queue_address(struct virtio_pci_modern_device *mdev, 579 u16 index, u64 desc_addr, u64 driver_addr, 580 u64 device_addr) 581 { 582 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 583 584 vp_iowrite16(index, &cfg->queue_select); 585 586 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo, 587 &cfg->queue_desc_hi); 588 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo, 589 &cfg->queue_avail_hi); 590 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo, 591 &cfg->queue_used_hi); 592 } 593 EXPORT_SYMBOL_GPL(vp_modern_queue_address); 594 595 /* 596 * vp_modern_set_queue_enable - enable a virtqueue 597 * @mdev: the modern virtio-pci device 598 * @index: the queue index 599 * @enable: whether the virtqueue is enable or not 600 */ 601 void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev, 602 u16 index, bool enable) 603 { 604 vp_iowrite16(index, &mdev->common->queue_select); 605 vp_iowrite16(enable, &mdev->common->queue_enable); 606 } 607 EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable); 608 609 /* 610 * vp_modern_get_queue_enable - enable a virtqueue 611 * @mdev: the modern virtio-pci device 612 * @index: the queue index 613 * 614 * Returns whether a virtqueue is enabled or not 615 */ 616 bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, 617 u16 index) 618 { 619 vp_iowrite16(index, &mdev->common->queue_select); 620 621 return vp_ioread16(&mdev->common->queue_enable); 622 } 623 EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable); 624 625 /* 626 * vp_modern_set_queue_size - set size for a virtqueue 627 * @mdev: the modern virtio-pci device 628 * @index: the queue index 629 * @size: the size of the virtqueue 630 */ 631 void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, 632 u16 index, u16 size) 633 { 634 vp_iowrite16(index, &mdev->common->queue_select); 635 vp_iowrite16(size, &mdev->common->queue_size); 636 637 } 638 EXPORT_SYMBOL_GPL(vp_modern_set_queue_size); 639 640 /* 641 * vp_modern_get_queue_size - get size for a virtqueue 642 * @mdev: the modern virtio-pci device 643 * @index: the queue index 644 * 645 * Returns the size of the virtqueue 646 */ 647 u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev, 648 u16 index) 649 { 650 vp_iowrite16(index, &mdev->common->queue_select); 651 652 return vp_ioread16(&mdev->common->queue_size); 653 654 } 655 EXPORT_SYMBOL_GPL(vp_modern_get_queue_size); 656 657 /* 658 * vp_modern_get_num_queues - get the number of virtqueues 659 * @mdev: the modern virtio-pci device 660 * 661 * Returns the number of virtqueues 662 */ 663 u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev) 664 { 665 return vp_ioread16(&mdev->common->num_queues); 666 } 667 EXPORT_SYMBOL_GPL(vp_modern_get_num_queues); 668 669 /* 670 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue 671 * @mdev: the modern virtio-pci device 672 * @index: the queue index 673 * 674 * Returns the notification offset for a virtqueue 675 */ 676 static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev, 677 u16 index) 678 { 679 vp_iowrite16(index, &mdev->common->queue_select); 680 681 return vp_ioread16(&mdev->common->queue_notify_off); 682 } 683 684 /* 685 * vp_modern_map_vq_notify - map notification area for a 686 * specific virtqueue 687 * @mdev: the modern virtio-pci device 688 * @index: the queue index 689 * @pa: the pointer to the physical address of the nofity area 690 * 691 * Returns the address of the notification area 692 */ 693 void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev, 694 u16 index, resource_size_t *pa) 695 { 696 u16 off = vp_modern_get_queue_notify_off(mdev, index); 697 698 if (mdev->notify_base) { 699 /* offset should not wrap */ 700 if ((u64)off * mdev->notify_offset_multiplier + 2 701 > mdev->notify_len) { 702 dev_warn(&mdev->pci_dev->dev, 703 "bad notification offset %u (x %u) " 704 "for queue %u > %zd", 705 off, mdev->notify_offset_multiplier, 706 index, mdev->notify_len); 707 return NULL; 708 } 709 if (pa) 710 *pa = mdev->notify_pa + 711 off * mdev->notify_offset_multiplier; 712 return mdev->notify_base + off * mdev->notify_offset_multiplier; 713 } else { 714 return vp_modern_map_capability(mdev, 715 mdev->notify_map_cap, 2, 2, 716 off * mdev->notify_offset_multiplier, 2, 717 NULL, pa); 718 } 719 } 720 EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify); 721 722 MODULE_VERSION("0.1"); 723 MODULE_DESCRIPTION("Modern Virtio PCI Device"); 724 MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); 725 MODULE_LICENSE("GPL"); 726