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virtio_pci_modern_dev.c
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linux-6.19.14/drivers/virtio/virtio_pci_modern_dev.c
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 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 BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_IDX != 211 offsetof(struct virtio_pci_modern_common_cfg, admin_queue_index)); 212 BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_NUM != 213 offsetof(struct virtio_pci_modern_common_cfg, admin_queue_num)); 214} 215 216/* 217 * vp_modern_probe: probe the modern virtio pci device, note that the 218 * caller is required to enable PCI device before calling this function. 219 * @mdev: the modern virtio-pci device 220 * 221 * Return 0 on succeed otherwise fail 222 */ 223int vp_modern_probe(struct virtio_pci_modern_device *mdev) 224{ 225 struct pci_dev *pci_dev = mdev->pci_dev; 226 int err, common, isr, notify, device; 227 u32 notify_length; 228 u32 notify_offset; 229 int devid; 230 231 check_offsets(); 232 233 if (mdev->device_id_check) { 234 devid = mdev->device_id_check(pci_dev); 235 if (devid < 0) 236 return devid; 237 mdev->id.device = devid; 238 } else { 239 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ 240 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) 241 return -ENODEV; 242 243 if (pci_dev->device < 0x1040) { 244 /* Transitional devices: use the PCI subsystem device id as 245 * virtio device id, same as legacy driver always did. 246 */ 247 mdev->id.device = pci_dev->subsystem_device; 248 } else { 249 /* Modern devices: simply use PCI device id, but start from 0x1040. */ 250 mdev->id.device = pci_dev->device - 0x1040; 251 } 252 } 253 mdev->id.vendor = pci_dev->subsystem_vendor; 254 255 /* check for a common config: if not, use legacy mode (bar 0). */ 256 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, 257 IORESOURCE_IO | IORESOURCE_MEM, 258 &mdev->modern_bars); 259 if (!common) { 260 dev_info(&pci_dev->dev, 261 "virtio_pci: leaving for legacy driver\n"); 262 return -ENODEV; 263 } 264 265 /* If common is there, these should be too... */ 266 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, 267 IORESOURCE_IO | IORESOURCE_MEM, 268 &mdev->modern_bars); 269 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, 270 IORESOURCE_IO | IORESOURCE_MEM, 271 &mdev->modern_bars); 272 if (!isr || !notify) { 273 dev_err(&pci_dev->dev, 274 "virtio_pci: missing capabilities %i/%i/%i\n", 275 common, isr, notify); 276 return -EINVAL; 277 } 278 279 err = dma_set_mask_and_coherent(&pci_dev->dev, 280 mdev->dma_mask ? : DMA_BIT_MASK(64)); 281 if (err) 282 err = dma_set_mask_and_coherent(&pci_dev->dev, 283 DMA_BIT_MASK(32)); 284 if (err) 285 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); 286 287 /* Device capability is only mandatory for devices that have 288 * device-specific configuration. 289 */ 290 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, 291 IORESOURCE_IO | IORESOURCE_MEM, 292 &mdev->modern_bars); 293 294 err = pci_request_selected_regions(pci_dev, mdev->modern_bars, 295 "virtio-pci-modern"); 296 if (err) 297 return err; 298 299 err = -EINVAL; 300 mdev->common = vp_modern_map_capability(mdev, common, 301 sizeof(struct virtio_pci_common_cfg), 4, 0, 302 offsetofend(struct virtio_pci_modern_common_cfg, 303 admin_queue_num), 304 &mdev->common_len, NULL); 305 if (!mdev->common) 306 goto err_map_common; 307 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1, 308 0, 1, 309 NULL, NULL); 310 if (!mdev->isr) 311 goto err_map_isr; 312 313 /* Read notify_off_multiplier from config space. */ 314 pci_read_config_dword(pci_dev, 315 notify + offsetof(struct virtio_pci_notify_cap, 316 notify_off_multiplier), 317 &mdev->notify_offset_multiplier); 318 /* Read notify length and offset from config space. */ 319 pci_read_config_dword(pci_dev, 320 notify + offsetof(struct virtio_pci_notify_cap, 321 cap.length), 322 ¬ify_length); 323 324 pci_read_config_dword(pci_dev, 325 notify + offsetof(struct virtio_pci_notify_cap, 326 cap.offset), 327 ¬ify_offset); 328 329 /* We don't know how many VQs we'll map, ahead of the time. 330 * If notify length is small, map it all now. 331 * Otherwise, map each VQ individually later. 332 */ 333 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { 334 mdev->notify_base = vp_modern_map_capability(mdev, notify, 335 2, 2, 336 0, notify_length, 337 &mdev->notify_len, 338 &mdev->notify_pa); 339 if (!mdev->notify_base) 340 goto err_map_notify; 341 } else { 342 mdev->notify_map_cap = notify; 343 } 344 345 /* Again, we don't know how much we should map, but PAGE_SIZE 346 * is more than enough for all existing devices. 347 */ 348 if (device) { 349 mdev->device = vp_modern_map_capability(mdev, device, 0, 4, 350 0, PAGE_SIZE, 351 &mdev->device_len, 352 NULL); 353 if (!mdev->device) 354 goto err_map_device; 355 } 356 357 return 0; 358 359err_map_device: 360 if (mdev->notify_base) 361 pci_iounmap(pci_dev, mdev->notify_base); 362err_map_notify: 363 pci_iounmap(pci_dev, mdev->isr); 364err_map_isr: 365 pci_iounmap(pci_dev, mdev->common); 366err_map_common: 367 pci_release_selected_regions(pci_dev, mdev->modern_bars); 368 return err; 369} 370EXPORT_SYMBOL_GPL(vp_modern_probe); 371 372/* 373 * vp_modern_remove: remove and cleanup the modern virtio pci device 374 * @mdev: the modern virtio-pci device 375 */ 376void vp_modern_remove(struct virtio_pci_modern_device *mdev) 377{ 378 struct pci_dev *pci_dev = mdev->pci_dev; 379 380 if (mdev->device) 381 pci_iounmap(pci_dev, mdev->device); 382 if (mdev->notify_base) 383 pci_iounmap(pci_dev, mdev->notify_base); 384 pci_iounmap(pci_dev, mdev->isr); 385 pci_iounmap(pci_dev, mdev->common); 386 pci_release_selected_regions(pci_dev, mdev->modern_bars); 387} 388EXPORT_SYMBOL_GPL(vp_modern_remove); 389 390/* 391 * vp_modern_get_extended_features - get features from device 392 * @mdev: the modern virtio-pci device 393 * @features: the features array to be filled 394 * 395 * Fill the specified features array with the features read from the device 396 */ 397void vp_modern_get_extended_features(struct virtio_pci_modern_device *mdev, 398 u64 *features) 399{ 400 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 401 int i; 402 403 virtio_features_zero(features); 404 for (i = 0; i < VIRTIO_FEATURES_BITS / 32; i++) { 405 u64 cur; 406 407 vp_iowrite32(i, &cfg->device_feature_select); 408 cur = vp_ioread32(&cfg->device_feature); 409 features[i >> 1] |= cur << (32 * (i & 1)); 410 } 411} 412EXPORT_SYMBOL_GPL(vp_modern_get_extended_features); 413 414/* 415 * vp_modern_get_driver_features - get driver features from device 416 * @mdev: the modern virtio-pci device 417 * @features: the features array to be filled 418 * 419 * Fill the specified features array with the driver features read from the 420 * device 421 */ 422void 423vp_modern_get_driver_extended_features(struct virtio_pci_modern_device *mdev, 424 u64 *features) 425{ 426 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 427 int i; 428 429 virtio_features_zero(features); 430 for (i = 0; i < VIRTIO_FEATURES_BITS / 32; i++) { 431 u64 cur; 432 433 vp_iowrite32(i, &cfg->guest_feature_select); 434 cur = vp_ioread32(&cfg->guest_feature); 435 features[i >> 1] |= cur << (32 * (i & 1)); 436 } 437} 438EXPORT_SYMBOL_GPL(vp_modern_get_driver_extended_features); 439 440/* 441 * vp_modern_set_extended_features - set features to device 442 * @mdev: the modern virtio-pci device 443 * @features: the features set to device 444 */ 445void vp_modern_set_extended_features(struct virtio_pci_modern_device *mdev, 446 const u64 *features) 447{ 448 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 449 int i; 450 451 for (i = 0; i < VIRTIO_FEATURES_BITS / 32; i++) { 452 u32 cur = features[i >> 1] >> (32 * (i & 1)); 453 454 vp_iowrite32(i, &cfg->guest_feature_select); 455 vp_iowrite32(cur, &cfg->guest_feature); 456 } 457} 458EXPORT_SYMBOL_GPL(vp_modern_set_extended_features); 459 460/* 461 * vp_modern_generation - get the device genreation 462 * @mdev: the modern virtio-pci device 463 * 464 * Returns the genreation read from device 465 */ 466u32 vp_modern_generation(struct virtio_pci_modern_device *mdev) 467{ 468 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 469 470 return vp_ioread8(&cfg->config_generation); 471} 472EXPORT_SYMBOL_GPL(vp_modern_generation); 473 474/* 475 * vp_modern_get_status - get the device status 476 * @mdev: the modern virtio-pci device 477 * 478 * Returns the status read from device 479 */ 480u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev) 481{ 482 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 483 484 return vp_ioread8(&cfg->device_status); 485} 486EXPORT_SYMBOL_GPL(vp_modern_get_status); 487 488/* 489 * vp_modern_set_status - set status to device 490 * @mdev: the modern virtio-pci device 491 * @status: the status set to device 492 */ 493void vp_modern_set_status(struct virtio_pci_modern_device *mdev, 494 u8 status) 495{ 496 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 497 498 /* 499 * Per memory-barriers.txt, wmb() is not needed to guarantee 500 * that the cache coherent memory writes have completed 501 * before writing to the MMIO region. 502 */ 503 vp_iowrite8(status, &cfg->device_status); 504} 505EXPORT_SYMBOL_GPL(vp_modern_set_status); 506 507/* 508 * vp_modern_get_queue_reset - get the queue reset status 509 * @mdev: the modern virtio-pci device 510 * @index: queue index 511 */ 512int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 513{ 514 struct virtio_pci_modern_common_cfg __iomem *cfg; 515 516 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 517 518 vp_iowrite16(index, &cfg->cfg.queue_select); 519 return vp_ioread16(&cfg->queue_reset); 520} 521EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset); 522 523/* 524 * vp_modern_set_queue_reset - reset the queue 525 * @mdev: the modern virtio-pci device 526 * @index: queue index 527 */ 528void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) 529{ 530 struct virtio_pci_modern_common_cfg __iomem *cfg; 531 532 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 533 534 vp_iowrite16(index, &cfg->cfg.queue_select); 535 vp_iowrite16(1, &cfg->queue_reset); 536 537 while (vp_ioread16(&cfg->queue_reset)) 538 msleep(1); 539 540 while (vp_ioread16(&cfg->cfg.queue_enable)) 541 msleep(1); 542} 543EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset); 544 545/* 546 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue 547 * @mdev: the modern virtio-pci device 548 * @index: queue index 549 * @vector: the queue vector 550 * 551 * Returns the queue vector read from the device 552 */ 553u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev, 554 u16 index, u16 vector) 555{ 556 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 557 558 vp_iowrite16(index, &cfg->queue_select); 559 vp_iowrite16(vector, &cfg->queue_msix_vector); 560 /* Flush the write out to device */ 561 return vp_ioread16(&cfg->queue_msix_vector); 562} 563EXPORT_SYMBOL_GPL(vp_modern_queue_vector); 564 565/* 566 * vp_modern_config_vector - set the vector for config interrupt 567 * @mdev: the modern virtio-pci device 568 * @vector: the config vector 569 * 570 * Returns the config vector read from the device 571 */ 572u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev, 573 u16 vector) 574{ 575 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 576 577 /* Setup the vector used for configuration events */ 578 vp_iowrite16(vector, &cfg->msix_config); 579 /* Verify we had enough resources to assign the vector */ 580 /* Will also flush the write out to device */ 581 return vp_ioread16(&cfg->msix_config); 582} 583EXPORT_SYMBOL_GPL(vp_modern_config_vector); 584 585/* 586 * vp_modern_queue_address - set the virtqueue address 587 * @mdev: the modern virtio-pci device 588 * @index: the queue index 589 * @desc_addr: address of the descriptor area 590 * @driver_addr: address of the driver area 591 * @device_addr: address of the device area 592 */ 593void vp_modern_queue_address(struct virtio_pci_modern_device *mdev, 594 u16 index, u64 desc_addr, u64 driver_addr, 595 u64 device_addr) 596{ 597 struct virtio_pci_common_cfg __iomem *cfg = mdev->common; 598 599 vp_iowrite16(index, &cfg->queue_select); 600 601 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo, 602 &cfg->queue_desc_hi); 603 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo, 604 &cfg->queue_avail_hi); 605 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo, 606 &cfg->queue_used_hi); 607} 608EXPORT_SYMBOL_GPL(vp_modern_queue_address); 609 610/* 611 * vp_modern_set_queue_enable - enable a virtqueue 612 * @mdev: the modern virtio-pci device 613 * @index: the queue index 614 * @enable: whether the virtqueue is enable or not 615 */ 616void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev, 617 u16 index, bool enable) 618{ 619 vp_iowrite16(index, &mdev->common->queue_select); 620 vp_iowrite16(enable, &mdev->common->queue_enable); 621} 622EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable); 623 624/* 625 * vp_modern_get_queue_enable - enable a virtqueue 626 * @mdev: the modern virtio-pci device 627 * @index: the queue index 628 * 629 * Returns whether a virtqueue is enabled or not 630 */ 631bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, 632 u16 index) 633{ 634 vp_iowrite16(index, &mdev->common->queue_select); 635 636 return vp_ioread16(&mdev->common->queue_enable); 637} 638EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable); 639 640/* 641 * vp_modern_set_queue_size - set size for a virtqueue 642 * @mdev: the modern virtio-pci device 643 * @index: the queue index 644 * @size: the size of the virtqueue 645 */ 646void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, 647 u16 index, u16 size) 648{ 649 vp_iowrite16(index, &mdev->common->queue_select); 650 vp_iowrite16(size, &mdev->common->queue_size); 651 652} 653EXPORT_SYMBOL_GPL(vp_modern_set_queue_size); 654 655/* 656 * vp_modern_get_queue_size - get size for a virtqueue 657 * @mdev: the modern virtio-pci device 658 * @index: the queue index 659 * 660 * Returns the size of the virtqueue 661 */ 662u16 vp_modern_get_queue_size(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_size); 668 669} 670EXPORT_SYMBOL_GPL(vp_modern_get_queue_size); 671 672/* 673 * vp_modern_get_num_queues - get the number of virtqueues 674 * @mdev: the modern virtio-pci device 675 * 676 * Returns the number of virtqueues 677 */ 678u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev) 679{ 680 return vp_ioread16(&mdev->common->num_queues); 681} 682EXPORT_SYMBOL_GPL(vp_modern_get_num_queues); 683 684/* 685 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue 686 * @mdev: the modern virtio-pci device 687 * @index: the queue index 688 * 689 * Returns the notification offset for a virtqueue 690 */ 691static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev, 692 u16 index) 693{ 694 vp_iowrite16(index, &mdev->common->queue_select); 695 696 return vp_ioread16(&mdev->common->queue_notify_off); 697} 698 699/* 700 * vp_modern_map_vq_notify - map notification area for a 701 * specific virtqueue 702 * @mdev: the modern virtio-pci device 703 * @index: the queue index 704 * @pa: the pointer to the physical address of the nofity area 705 * 706 * Returns the address of the notification area 707 */ 708void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev, 709 u16 index, resource_size_t *pa) 710{ 711 u16 off = vp_modern_get_queue_notify_off(mdev, index); 712 713 if (mdev->notify_base) { 714 /* offset should not wrap */ 715 if ((u64)off * mdev->notify_offset_multiplier + 2 716 > mdev->notify_len) { 717 dev_warn(&mdev->pci_dev->dev, 718 "bad notification offset %u (x %u) " 719 "for queue %u > %zd", 720 off, mdev->notify_offset_multiplier, 721 index, mdev->notify_len); 722 return NULL; 723 } 724 if (pa) 725 *pa = mdev->notify_pa + 726 off * mdev->notify_offset_multiplier; 727 return mdev->notify_base + off * mdev->notify_offset_multiplier; 728 } else { 729 return vp_modern_map_capability(mdev, 730 mdev->notify_map_cap, 2, 2, 731 off * mdev->notify_offset_multiplier, 2, 732 NULL, pa); 733 } 734} 735EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify); 736 737u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev) 738{ 739 struct virtio_pci_modern_common_cfg __iomem *cfg; 740 741 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 742 return vp_ioread16(&cfg->admin_queue_num); 743} 744EXPORT_SYMBOL_GPL(vp_modern_avq_num); 745 746u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev) 747{ 748 struct virtio_pci_modern_common_cfg __iomem *cfg; 749 750 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; 751 return vp_ioread16(&cfg->admin_queue_index); 752} 753EXPORT_SYMBOL_GPL(vp_modern_avq_index); 754 755MODULE_VERSION("0.1"); 756MODULE_DESCRIPTION("Modern Virtio PCI Device"); 757MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); 758MODULE_LICENSE("GPL");
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