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 */ 21static void __iomem * 22vp_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 */ 114static 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. */ 146static 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 */ 215int 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 int devid; 222 223 check_offsets(); 224 225 if (mdev->device_id_check) { 226 devid = mdev->device_id_check(pci_dev); 227 if (devid < 0) 228 return devid; 229 mdev->id.device = devid; 230 } else { 231 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ 232 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) 233 return -ENODEV; 234 235 if (pci_dev->device < 0x1040) { 236 /* Transitional devices: use the PCI subsystem device id as 237 * virtio device id, same as legacy driver always did. 238 */ 239 mdev->id.device = pci_dev->subsystem_device; 240 } else { 241 /* Modern devices: simply use PCI device id, but start from 0x1040. */ 242 mdev->id.device = pci_dev->device - 0x1040; 243 } 244 } 245 mdev->id.vendor = pci_dev->subsystem_vendor; 246 247 /* check for a common config: if not, use legacy mode (bar 0). */ 248 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, 249 IORESOURCE_IO | IORESOURCE_MEM, 250 &mdev->modern_bars); 251 if (!common) { 252 dev_info(&pci_dev->dev, 253 "virtio_pci: leaving for legacy driver\n"); 254 return -ENODEV; 255 } 256 257 /* If common is there, these should be too... */ 258 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, 259 IORESOURCE_IO | IORESOURCE_MEM, 260 &mdev->modern_bars); 261 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, 262 IORESOURCE_IO | IORESOURCE_MEM, 263 &mdev->modern_bars); 264 if (!isr || !notify) { 265 dev_err(&pci_dev->dev, 266 "virtio_pci: missing capabilities %i/%i/%i\n", 267 common, isr, notify); 268 return -EINVAL; 269 } 270 271 err = dma_set_mask_and_coherent(&pci_dev->dev, 272 mdev->dma_mask ? : DMA_BIT_MASK(64)); 273 if (err) 274 err = dma_set_mask_and_coherent(&pci_dev->dev, 275 DMA_BIT_MASK(32)); 276 if (err) 277 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); 278 279 /* Device capability is only mandatory for devices that have 280 * device-specific configuration. 281 */ 282 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, 283 IORESOURCE_IO | IORESOURCE_MEM, 284 &mdev->modern_bars); 285 286 err = pci_request_selected_regions(pci_dev, mdev->modern_bars, 287 "virtio-pci-modern"); 288 if (err) 289 return err; 290 291 err = -EINVAL; 292 mdev->common = vp_modern_map_capability(mdev, common, 293 sizeof(struct virtio_pci_common_cfg), 4, 294 0, sizeof(struct virtio_pci_modern_common_cfg), 295 NULL, NULL); 296 if (!mdev->common) 297 goto err_map_common; 298 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1, 299 0, 1, 300 NULL, NULL); 301 if (!mdev->isr) 302 goto err_map_isr; 303 304 /* Read notify_off_multiplier from config space. */ 305 pci_read_config_dword(pci_dev, 306 notify + offsetof(struct virtio_pci_notify_cap, 307 notify_off_multiplier), 308 &mdev->notify_offset_multiplier); 309 /* Read notify length and offset from config space. */ 310 pci_read_config_dword(pci_dev, 311 notify + offsetof(struct virtio_pci_notify_cap, 312 cap.length), 313 ¬ify_length); 314 315 pci_read_config_dword(pci_dev, 316 notify + offsetof(struct virtio_pci_notify_cap, 317 cap.offset), 318 ¬ify_offset); 319 320 /* We don't know how many VQs we'll map, ahead of the time. 321 * If notify length is small, map it all now. 322 * Otherwise, map each VQ individually later. 323 */ 324 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { 325 mdev->notify_base = vp_modern_map_capability(mdev, notify, 326 2, 2, 327 0, notify_length, 328 &mdev->notify_len, 329 &mdev->notify_pa); 330 if (!mdev->notify_base) 331 goto err_map_notify; 332 } else { 333 mdev->notify_map_cap = notify; 334 } 335 336 /* Again, we don't know how much we should map, but PAGE_SIZE 337 * is more than enough for all existing devices. 338 */ 339 if (device) { 340 mdev->device = vp_modern_map_capability(mdev, device, 0, 4, 341 0, PAGE_SIZE, 342 &mdev->device_len, 343 NULL); 344 if (!mdev->device) 345 goto err_map_device; 346 } 347 348 return 0; 349 350err_map_device: 351 if (mdev->notify_base) 352 pci_iounmap(pci_dev, mdev->notify_base); 353err_map_notify: 354 pci_iounmap(pci_dev, mdev->isr); 355err_map_isr: 356 pci_iounmap(pci_dev, mdev->common); 357err_map_common: 358 pci_release_selected_regions(pci_dev, mdev->modern_bars); 359 return err; 360} 361EXPORT_SYMBOL_GPL(vp_modern_probe); 362 363/* 364 * vp_modern_remove: remove and cleanup the modern virtio pci device 365 * @mdev: the modern virtio-pci device 366 */ 367void vp_modern_remove(struct virtio_pci_modern_device *mdev) 368{ 369 struct pci_dev *pci_dev = mdev->pci_dev; 370 371 if (mdev->device) 372 pci_iounmap(pci_dev, mdev->device); 373 if (mdev->notify_base) 374 pci_iounmap(pci_dev, mdev->notify_base); 375 pci_iounmap(pci_dev, mdev->isr); 376 pci_iounmap(pci_dev, mdev->common); 377 pci_release_selected_regions(pci_dev, mdev->modern_bars); 378} 379EXPORT_SYMBOL_GPL(vp_modern_remove); 380 381/* 382 * vp_modern_get_features - get features from device 383 * @mdev: the modern virtio-pci device 384 * 385 * Returns the features read from the device 386 */ 387u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev) 388{ 389 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 390 391 u64 features; 392 393 vp_iowrite32(0, &cfg->device_feature_select); 394 features = vp_ioread32(&cfg->device_feature); 395 vp_iowrite32(1, &cfg->device_feature_select); 396 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32); 397 398 return features; 399} 400EXPORT_SYMBOL_GPL(vp_modern_get_features); 401 402/* 403 * vp_modern_get_driver_features - get driver features from device 404 * @mdev: the modern virtio-pci device 405 * 406 * Returns the driver features read from the device 407 */ 408u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev) 409{ 410 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 411 412 u64 features; 413 414 vp_iowrite32(0, &cfg->guest_feature_select); 415 features = vp_ioread32(&cfg->guest_feature); 416 vp_iowrite32(1, &cfg->guest_feature_select); 417 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32); 418 419 return features; 420} 421EXPORT_SYMBOL_GPL(vp_modern_get_driver_features); 422 423/* 424 * vp_modern_set_features - set features to device 425 * @mdev: the modern virtio-pci device 426 * @features: the features set to device 427 */ 428void vp_modern_set_features(struct virtio_pci_modern_device *mdev, 429 u64 features) 430{ 431 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 432 433 vp_iowrite32(0, &cfg->guest_feature_select); 434 vp_iowrite32((u32)features, &cfg->guest_feature); 435 vp_iowrite32(1, &cfg->guest_feature_select); 436 vp_iowrite32(features >> 32, &cfg->guest_feature); 437} 438EXPORT_SYMBOL_GPL(vp_modern_set_features); 439 440/* 441 * vp_modern_generation - get the device genreation 442 * @mdev: the modern virtio-pci device 443 * 444 * Returns the genreation read from device 445 */ 446u32 vp_modern_generation(struct virtio_pci_modern_device *mdev) 447{ 448 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 449 450 return vp_ioread8(&cfg->config_generation); 451} 452EXPORT_SYMBOL_GPL(vp_modern_generation); 453 454/* 455 * vp_modern_get_status - get the device status 456 * @mdev: the modern virtio-pci device 457 * 458 * Returns the status read from device 459 */ 460u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev) 461{ 462 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 463 464 return vp_ioread8(&cfg->device_status); 465} 466EXPORT_SYMBOL_GPL(vp_modern_get_status); 467 468/* 469 * vp_modern_set_status - set status to device 470 * @mdev: the modern virtio-pci device 471 * @status: the status set to device 472 */ 473void vp_modern_set_status(struct virtio_pci_modern_device *mdev, 474 u8 status) 475{ 476 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 477 478 /* 479 * Per memory-barriers.txt, wmb() is not needed to guarantee 480 * that the cache coherent memory writes have completed 481 * before writing to the MMIO region. 482 */ 483 vp_iowrite8(status, &cfg->device_status); 484} 485EXPORT_SYMBOL_GPL(vp_modern_set_status); 486 487/* 488 * vp_modern_get_queue_reset - get the queue reset status 489 * @mdev: the modern virtio-pci device 490 * @index: queue index 491 */ 492int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 493{ 494 struct virtio_pci_modern_common_cfg __iomem *cfg; 495 496 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 497 498 vp_iowrite16(index, &cfg->cfg.queue_select); 499 return vp_ioread16(&cfg->queue_reset); 500} 501EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset); 502 503/* 504 * vp_modern_set_queue_reset - reset the queue 505 * @mdev: the modern virtio-pci device 506 * @index: queue index 507 */ 508void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 509{ 510 struct virtio_pci_modern_common_cfg __iomem *cfg; 511 512 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 513 514 vp_iowrite16(index, &cfg->cfg.queue_select); 515 vp_iowrite16(1, &cfg->queue_reset); 516 517 while (vp_ioread16(&cfg->queue_reset)) 518 msleep(1); 519 520 while (vp_ioread16(&cfg->cfg.queue_enable)) 521 msleep(1); 522} 523EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset); 524 525/* 526 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue 527 * @mdev: the modern virtio-pci device 528 * @index: queue index 529 * @vector: the config vector 530 * 531 * Returns the config vector read from the device 532 */ 533u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev, 534 u16 index, u16 vector) 535{ 536 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 537 538 vp_iowrite16(index, &cfg->queue_select); 539 vp_iowrite16(vector, &cfg->queue_msix_vector); 540 /* Flush the write out to device */ 541 return vp_ioread16(&cfg->queue_msix_vector); 542} 543EXPORT_SYMBOL_GPL(vp_modern_queue_vector); 544 545/* 546 * vp_modern_config_vector - set the vector for config interrupt 547 * @mdev: the modern virtio-pci device 548 * @vector: the config vector 549 * 550 * Returns the config vector read from the device 551 */ 552u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev, 553 u16 vector) 554{ 555 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 556 557 /* Setup the vector used for configuration events */ 558 vp_iowrite16(vector, &cfg->msix_config); 559 /* Verify we had enough resources to assign the vector */ 560 /* Will also flush the write out to device */ 561 return vp_ioread16(&cfg->msix_config); 562} 563EXPORT_SYMBOL_GPL(vp_modern_config_vector); 564 565/* 566 * vp_modern_queue_address - set the virtqueue address 567 * @mdev: the modern virtio-pci device 568 * @index: the queue index 569 * @desc_addr: address of the descriptor area 570 * @driver_addr: address of the driver area 571 * @device_addr: address of the device area 572 */ 573void vp_modern_queue_address(struct virtio_pci_modern_device *mdev, 574 u16 index, u64 desc_addr, u64 driver_addr, 575 u64 device_addr) 576{ 577 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 578 579 vp_iowrite16(index, &cfg->queue_select); 580 581 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo, 582 &cfg->queue_desc_hi); 583 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo, 584 &cfg->queue_avail_hi); 585 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo, 586 &cfg->queue_used_hi); 587} 588EXPORT_SYMBOL_GPL(vp_modern_queue_address); 589 590/* 591 * vp_modern_set_queue_enable - enable a virtqueue 592 * @mdev: the modern virtio-pci device 593 * @index: the queue index 594 * @enable: whether the virtqueue is enable or not 595 */ 596void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev, 597 u16 index, bool enable) 598{ 599 vp_iowrite16(index, &mdev->common->queue_select); 600 vp_iowrite16(enable, &mdev->common->queue_enable); 601} 602EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable); 603 604/* 605 * vp_modern_get_queue_enable - enable a virtqueue 606 * @mdev: the modern virtio-pci device 607 * @index: the queue index 608 * 609 * Returns whether a virtqueue is enabled or not 610 */ 611bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, 612 u16 index) 613{ 614 vp_iowrite16(index, &mdev->common->queue_select); 615 616 return vp_ioread16(&mdev->common->queue_enable); 617} 618EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable); 619 620/* 621 * vp_modern_set_queue_size - set size for a virtqueue 622 * @mdev: the modern virtio-pci device 623 * @index: the queue index 624 * @size: the size of the virtqueue 625 */ 626void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, 627 u16 index, u16 size) 628{ 629 vp_iowrite16(index, &mdev->common->queue_select); 630 vp_iowrite16(size, &mdev->common->queue_size); 631 632} 633EXPORT_SYMBOL_GPL(vp_modern_set_queue_size); 634 635/* 636 * vp_modern_get_queue_size - get size for a virtqueue 637 * @mdev: the modern virtio-pci device 638 * @index: the queue index 639 * 640 * Returns the size of the virtqueue 641 */ 642u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev, 643 u16 index) 644{ 645 vp_iowrite16(index, &mdev->common->queue_select); 646 647 return vp_ioread16(&mdev->common->queue_size); 648 649} 650EXPORT_SYMBOL_GPL(vp_modern_get_queue_size); 651 652/* 653 * vp_modern_get_num_queues - get the number of virtqueues 654 * @mdev: the modern virtio-pci device 655 * 656 * Returns the number of virtqueues 657 */ 658u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev) 659{ 660 return vp_ioread16(&mdev->common->num_queues); 661} 662EXPORT_SYMBOL_GPL(vp_modern_get_num_queues); 663 664/* 665 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue 666 * @mdev: the modern virtio-pci device 667 * @index: the queue index 668 * 669 * Returns the notification offset for a virtqueue 670 */ 671static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev, 672 u16 index) 673{ 674 vp_iowrite16(index, &mdev->common->queue_select); 675 676 return vp_ioread16(&mdev->common->queue_notify_off); 677} 678 679/* 680 * vp_modern_map_vq_notify - map notification area for a 681 * specific virtqueue 682 * @mdev: the modern virtio-pci device 683 * @index: the queue index 684 * @pa: the pointer to the physical address of the nofity area 685 * 686 * Returns the address of the notification area 687 */ 688void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev, 689 u16 index, resource_size_t *pa) 690{ 691 u16 off = vp_modern_get_queue_notify_off(mdev, index); 692 693 if (mdev->notify_base) { 694 /* offset should not wrap */ 695 if ((u64)off * mdev->notify_offset_multiplier + 2 696 > mdev->notify_len) { 697 dev_warn(&mdev->pci_dev->dev, 698 "bad notification offset %u (x %u) " 699 "for queue %u > %zd", 700 off, mdev->notify_offset_multiplier, 701 index, mdev->notify_len); 702 return NULL; 703 } 704 if (pa) 705 *pa = mdev->notify_pa + 706 off * mdev->notify_offset_multiplier; 707 return mdev->notify_base + off * mdev->notify_offset_multiplier; 708 } else { 709 return vp_modern_map_capability(mdev, 710 mdev->notify_map_cap, 2, 2, 711 off * mdev->notify_offset_multiplier, 2, 712 NULL, pa); 713 } 714} 715EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify); 716 717MODULE_VERSION("0.1"); 718MODULE_DESCRIPTION("Modern Virtio PCI Device"); 719MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); 720MODULE_LICENSE("GPL"); 721