1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com> 4 * (C) Copyright 2002-2004 IBM Corp. 5 * (C) Copyright 2003 Matthew Wilcox 6 * (C) Copyright 2003 Hewlett-Packard 7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com> 8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com> 9 * 10 * File attributes for PCI devices 11 * 12 * Modeled after usb's driverfs.c 13 */ 14 15 16 #include <linux/kernel.h> 17 #include <linux/sched.h> 18 #include <linux/pci.h> 19 #include <linux/stat.h> 20 #include <linux/export.h> 21 #include <linux/topology.h> 22 #include <linux/mm.h> 23 #include <linux/fs.h> 24 #include <linux/capability.h> 25 #include <linux/security.h> 26 #include <linux/slab.h> 27 #include <linux/vgaarb.h> 28 #include <linux/pm_runtime.h> 29 #include <linux/of.h> 30 #include "pci.h" 31 32 static int sysfs_initialized; /* = 0 */ 33 34 /* show configuration fields */ 35 #define pci_config_attr(field, format_string) \ 36 static ssize_t \ 37 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 38 { \ 39 struct pci_dev *pdev; \ 40 \ 41 pdev = to_pci_dev(dev); \ 42 return sprintf(buf, format_string, pdev->field); \ 43 } \ 44 static DEVICE_ATTR_RO(field) 45 46 pci_config_attr(vendor, "0x%04x\n"); 47 pci_config_attr(device, "0x%04x\n"); 48 pci_config_attr(subsystem_vendor, "0x%04x\n"); 49 pci_config_attr(subsystem_device, "0x%04x\n"); 50 pci_config_attr(revision, "0x%02x\n"); 51 pci_config_attr(class, "0x%06x\n"); 52 pci_config_attr(irq, "%u\n"); 53 54 static ssize_t broken_parity_status_show(struct device *dev, 55 struct device_attribute *attr, 56 char *buf) 57 { 58 struct pci_dev *pdev = to_pci_dev(dev); 59 return sprintf(buf, "%u\n", pdev->broken_parity_status); 60 } 61 62 static ssize_t broken_parity_status_store(struct device *dev, 63 struct device_attribute *attr, 64 const char *buf, size_t count) 65 { 66 struct pci_dev *pdev = to_pci_dev(dev); 67 unsigned long val; 68 69 if (kstrtoul(buf, 0, &val) < 0) 70 return -EINVAL; 71 72 pdev->broken_parity_status = !!val; 73 74 return count; 75 } 76 static DEVICE_ATTR_RW(broken_parity_status); 77 78 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list, 79 struct device_attribute *attr, char *buf) 80 { 81 const struct cpumask *mask; 82 83 #ifdef CONFIG_NUMA 84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask : 85 cpumask_of_node(dev_to_node(dev)); 86 #else 87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus); 88 #endif 89 return cpumap_print_to_pagebuf(list, buf, mask); 90 } 91 92 static ssize_t local_cpus_show(struct device *dev, 93 struct device_attribute *attr, char *buf) 94 { 95 return pci_dev_show_local_cpu(dev, false, attr, buf); 96 } 97 static DEVICE_ATTR_RO(local_cpus); 98 99 static ssize_t local_cpulist_show(struct device *dev, 100 struct device_attribute *attr, char *buf) 101 { 102 return pci_dev_show_local_cpu(dev, true, attr, buf); 103 } 104 static DEVICE_ATTR_RO(local_cpulist); 105 106 /* 107 * PCI Bus Class Devices 108 */ 109 static ssize_t cpuaffinity_show(struct device *dev, 110 struct device_attribute *attr, char *buf) 111 { 112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev)); 113 114 return cpumap_print_to_pagebuf(false, buf, cpumask); 115 } 116 static DEVICE_ATTR_RO(cpuaffinity); 117 118 static ssize_t cpulistaffinity_show(struct device *dev, 119 struct device_attribute *attr, char *buf) 120 { 121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev)); 122 123 return cpumap_print_to_pagebuf(true, buf, cpumask); 124 } 125 static DEVICE_ATTR_RO(cpulistaffinity); 126 127 /* show resources */ 128 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, 129 char *buf) 130 { 131 struct pci_dev *pci_dev = to_pci_dev(dev); 132 char *str = buf; 133 int i; 134 int max; 135 resource_size_t start, end; 136 137 if (pci_dev->subordinate) 138 max = DEVICE_COUNT_RESOURCE; 139 else 140 max = PCI_BRIDGE_RESOURCES; 141 142 for (i = 0; i < max; i++) { 143 struct resource *res = &pci_dev->resource[i]; 144 pci_resource_to_user(pci_dev, i, res, &start, &end); 145 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n", 146 (unsigned long long)start, 147 (unsigned long long)end, 148 (unsigned long long)res->flags); 149 } 150 return (str - buf); 151 } 152 static DEVICE_ATTR_RO(resource); 153 154 static ssize_t max_link_speed_show(struct device *dev, 155 struct device_attribute *attr, char *buf) 156 { 157 struct pci_dev *pdev = to_pci_dev(dev); 158 159 return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev))); 160 } 161 static DEVICE_ATTR_RO(max_link_speed); 162 163 static ssize_t max_link_width_show(struct device *dev, 164 struct device_attribute *attr, char *buf) 165 { 166 struct pci_dev *pdev = to_pci_dev(dev); 167 168 return sprintf(buf, "%u\n", pcie_get_width_cap(pdev)); 169 } 170 static DEVICE_ATTR_RO(max_link_width); 171 172 static ssize_t current_link_speed_show(struct device *dev, 173 struct device_attribute *attr, char *buf) 174 { 175 struct pci_dev *pci_dev = to_pci_dev(dev); 176 u16 linkstat; 177 int err; 178 const char *speed; 179 180 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat); 181 if (err) 182 return -EINVAL; 183 184 switch (linkstat & PCI_EXP_LNKSTA_CLS) { 185 case PCI_EXP_LNKSTA_CLS_32_0GB: 186 speed = "32 GT/s"; 187 break; 188 case PCI_EXP_LNKSTA_CLS_16_0GB: 189 speed = "16 GT/s"; 190 break; 191 case PCI_EXP_LNKSTA_CLS_8_0GB: 192 speed = "8 GT/s"; 193 break; 194 case PCI_EXP_LNKSTA_CLS_5_0GB: 195 speed = "5 GT/s"; 196 break; 197 case PCI_EXP_LNKSTA_CLS_2_5GB: 198 speed = "2.5 GT/s"; 199 break; 200 default: 201 speed = "Unknown speed"; 202 } 203 204 return sprintf(buf, "%s\n", speed); 205 } 206 static DEVICE_ATTR_RO(current_link_speed); 207 208 static ssize_t current_link_width_show(struct device *dev, 209 struct device_attribute *attr, char *buf) 210 { 211 struct pci_dev *pci_dev = to_pci_dev(dev); 212 u16 linkstat; 213 int err; 214 215 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat); 216 if (err) 217 return -EINVAL; 218 219 return sprintf(buf, "%u\n", 220 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT); 221 } 222 static DEVICE_ATTR_RO(current_link_width); 223 224 static ssize_t secondary_bus_number_show(struct device *dev, 225 struct device_attribute *attr, 226 char *buf) 227 { 228 struct pci_dev *pci_dev = to_pci_dev(dev); 229 u8 sec_bus; 230 int err; 231 232 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus); 233 if (err) 234 return -EINVAL; 235 236 return sprintf(buf, "%u\n", sec_bus); 237 } 238 static DEVICE_ATTR_RO(secondary_bus_number); 239 240 static ssize_t subordinate_bus_number_show(struct device *dev, 241 struct device_attribute *attr, 242 char *buf) 243 { 244 struct pci_dev *pci_dev = to_pci_dev(dev); 245 u8 sub_bus; 246 int err; 247 248 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus); 249 if (err) 250 return -EINVAL; 251 252 return sprintf(buf, "%u\n", sub_bus); 253 } 254 static DEVICE_ATTR_RO(subordinate_bus_number); 255 256 static ssize_t ari_enabled_show(struct device *dev, 257 struct device_attribute *attr, 258 char *buf) 259 { 260 struct pci_dev *pci_dev = to_pci_dev(dev); 261 262 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus)); 263 } 264 static DEVICE_ATTR_RO(ari_enabled); 265 266 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 267 char *buf) 268 { 269 struct pci_dev *pci_dev = to_pci_dev(dev); 270 271 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n", 272 pci_dev->vendor, pci_dev->device, 273 pci_dev->subsystem_vendor, pci_dev->subsystem_device, 274 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), 275 (u8)(pci_dev->class)); 276 } 277 static DEVICE_ATTR_RO(modalias); 278 279 static ssize_t enable_store(struct device *dev, struct device_attribute *attr, 280 const char *buf, size_t count) 281 { 282 struct pci_dev *pdev = to_pci_dev(dev); 283 unsigned long val; 284 ssize_t result = kstrtoul(buf, 0, &val); 285 286 if (result < 0) 287 return result; 288 289 /* this can crash the machine when done on the "wrong" device */ 290 if (!capable(CAP_SYS_ADMIN)) 291 return -EPERM; 292 293 device_lock(dev); 294 if (dev->driver) 295 result = -EBUSY; 296 else if (val) 297 result = pci_enable_device(pdev); 298 else if (pci_is_enabled(pdev)) 299 pci_disable_device(pdev); 300 else 301 result = -EIO; 302 device_unlock(dev); 303 304 return result < 0 ? result : count; 305 } 306 307 static ssize_t enable_show(struct device *dev, struct device_attribute *attr, 308 char *buf) 309 { 310 struct pci_dev *pdev; 311 312 pdev = to_pci_dev(dev); 313 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt)); 314 } 315 static DEVICE_ATTR_RW(enable); 316 317 #ifdef CONFIG_NUMA 318 static ssize_t numa_node_store(struct device *dev, 319 struct device_attribute *attr, const char *buf, 320 size_t count) 321 { 322 struct pci_dev *pdev = to_pci_dev(dev); 323 int node, ret; 324 325 if (!capable(CAP_SYS_ADMIN)) 326 return -EPERM; 327 328 ret = kstrtoint(buf, 0, &node); 329 if (ret) 330 return ret; 331 332 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES) 333 return -EINVAL; 334 335 if (node != NUMA_NO_NODE && !node_online(node)) 336 return -EINVAL; 337 338 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); 339 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.", 340 node); 341 342 dev->numa_node = node; 343 return count; 344 } 345 346 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, 347 char *buf) 348 { 349 return sprintf(buf, "%d\n", dev->numa_node); 350 } 351 static DEVICE_ATTR_RW(numa_node); 352 #endif 353 354 static ssize_t dma_mask_bits_show(struct device *dev, 355 struct device_attribute *attr, char *buf) 356 { 357 struct pci_dev *pdev = to_pci_dev(dev); 358 359 return sprintf(buf, "%d\n", fls64(pdev->dma_mask)); 360 } 361 static DEVICE_ATTR_RO(dma_mask_bits); 362 363 static ssize_t consistent_dma_mask_bits_show(struct device *dev, 364 struct device_attribute *attr, 365 char *buf) 366 { 367 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask)); 368 } 369 static DEVICE_ATTR_RO(consistent_dma_mask_bits); 370 371 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr, 372 char *buf) 373 { 374 struct pci_dev *pdev = to_pci_dev(dev); 375 struct pci_bus *subordinate = pdev->subordinate; 376 377 return sprintf(buf, "%u\n", subordinate ? 378 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) 379 : !pdev->no_msi); 380 } 381 382 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr, 383 const char *buf, size_t count) 384 { 385 struct pci_dev *pdev = to_pci_dev(dev); 386 struct pci_bus *subordinate = pdev->subordinate; 387 unsigned long val; 388 389 if (kstrtoul(buf, 0, &val) < 0) 390 return -EINVAL; 391 392 if (!capable(CAP_SYS_ADMIN)) 393 return -EPERM; 394 395 /* 396 * "no_msi" and "bus_flags" only affect what happens when a driver 397 * requests MSI or MSI-X. They don't affect any drivers that have 398 * already requested MSI or MSI-X. 399 */ 400 if (!subordinate) { 401 pdev->no_msi = !val; 402 pci_info(pdev, "MSI/MSI-X %s for future drivers\n", 403 val ? "allowed" : "disallowed"); 404 return count; 405 } 406 407 if (val) 408 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; 409 else 410 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; 411 412 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n", 413 val ? "allowed" : "disallowed"); 414 return count; 415 } 416 static DEVICE_ATTR_RW(msi_bus); 417 418 static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count) 419 { 420 unsigned long val; 421 struct pci_bus *b = NULL; 422 423 if (kstrtoul(buf, 0, &val) < 0) 424 return -EINVAL; 425 426 if (val) { 427 pci_lock_rescan_remove(); 428 while ((b = pci_find_next_bus(b)) != NULL) 429 pci_rescan_bus(b); 430 pci_unlock_rescan_remove(); 431 } 432 return count; 433 } 434 static BUS_ATTR_WO(rescan); 435 436 static struct attribute *pci_bus_attrs[] = { 437 &bus_attr_rescan.attr, 438 NULL, 439 }; 440 441 static const struct attribute_group pci_bus_group = { 442 .attrs = pci_bus_attrs, 443 }; 444 445 const struct attribute_group *pci_bus_groups[] = { 446 &pci_bus_group, 447 NULL, 448 }; 449 450 static ssize_t dev_rescan_store(struct device *dev, 451 struct device_attribute *attr, const char *buf, 452 size_t count) 453 { 454 unsigned long val; 455 struct pci_dev *pdev = to_pci_dev(dev); 456 457 if (kstrtoul(buf, 0, &val) < 0) 458 return -EINVAL; 459 460 if (val) { 461 pci_lock_rescan_remove(); 462 pci_rescan_bus(pdev->bus); 463 pci_unlock_rescan_remove(); 464 } 465 return count; 466 } 467 static DEVICE_ATTR(rescan, (S_IWUSR | S_IWGRP), NULL, dev_rescan_store); 468 469 static ssize_t remove_store(struct device *dev, struct device_attribute *attr, 470 const char *buf, size_t count) 471 { 472 unsigned long val; 473 474 if (kstrtoul(buf, 0, &val) < 0) 475 return -EINVAL; 476 477 if (val && device_remove_file_self(dev, attr)) 478 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); 479 return count; 480 } 481 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, (S_IWUSR | S_IWGRP), NULL, 482 remove_store); 483 484 static ssize_t dev_bus_rescan_store(struct device *dev, 485 struct device_attribute *attr, 486 const char *buf, size_t count) 487 { 488 unsigned long val; 489 struct pci_bus *bus = to_pci_bus(dev); 490 491 if (kstrtoul(buf, 0, &val) < 0) 492 return -EINVAL; 493 494 if (val) { 495 pci_lock_rescan_remove(); 496 if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) 497 pci_rescan_bus_bridge_resize(bus->self); 498 else 499 pci_rescan_bus(bus); 500 pci_unlock_rescan_remove(); 501 } 502 return count; 503 } 504 static DEVICE_ATTR(bus_rescan, (S_IWUSR | S_IWGRP), NULL, dev_bus_rescan_store); 505 506 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 507 static ssize_t d3cold_allowed_store(struct device *dev, 508 struct device_attribute *attr, 509 const char *buf, size_t count) 510 { 511 struct pci_dev *pdev = to_pci_dev(dev); 512 unsigned long val; 513 514 if (kstrtoul(buf, 0, &val) < 0) 515 return -EINVAL; 516 517 pdev->d3cold_allowed = !!val; 518 if (pdev->d3cold_allowed) 519 pci_d3cold_enable(pdev); 520 else 521 pci_d3cold_disable(pdev); 522 523 pm_runtime_resume(dev); 524 525 return count; 526 } 527 528 static ssize_t d3cold_allowed_show(struct device *dev, 529 struct device_attribute *attr, char *buf) 530 { 531 struct pci_dev *pdev = to_pci_dev(dev); 532 return sprintf(buf, "%u\n", pdev->d3cold_allowed); 533 } 534 static DEVICE_ATTR_RW(d3cold_allowed); 535 #endif 536 537 #ifdef CONFIG_OF 538 static ssize_t devspec_show(struct device *dev, 539 struct device_attribute *attr, char *buf) 540 { 541 struct pci_dev *pdev = to_pci_dev(dev); 542 struct device_node *np = pci_device_to_OF_node(pdev); 543 544 if (np == NULL) 545 return 0; 546 return sprintf(buf, "%pOF", np); 547 } 548 static DEVICE_ATTR_RO(devspec); 549 #endif 550 551 #ifdef CONFIG_PCI_IOV 552 static ssize_t sriov_totalvfs_show(struct device *dev, 553 struct device_attribute *attr, 554 char *buf) 555 { 556 struct pci_dev *pdev = to_pci_dev(dev); 557 558 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev)); 559 } 560 561 562 static ssize_t sriov_numvfs_show(struct device *dev, 563 struct device_attribute *attr, 564 char *buf) 565 { 566 struct pci_dev *pdev = to_pci_dev(dev); 567 568 return sprintf(buf, "%u\n", pdev->sriov->num_VFs); 569 } 570 571 /* 572 * num_vfs > 0; number of VFs to enable 573 * num_vfs = 0; disable all VFs 574 * 575 * Note: SRIOV spec doesn't allow partial VF 576 * disable, so it's all or none. 577 */ 578 static ssize_t sriov_numvfs_store(struct device *dev, 579 struct device_attribute *attr, 580 const char *buf, size_t count) 581 { 582 struct pci_dev *pdev = to_pci_dev(dev); 583 int ret; 584 u16 num_vfs; 585 586 ret = kstrtou16(buf, 0, &num_vfs); 587 if (ret < 0) 588 return ret; 589 590 if (num_vfs > pci_sriov_get_totalvfs(pdev)) 591 return -ERANGE; 592 593 device_lock(&pdev->dev); 594 595 if (num_vfs == pdev->sriov->num_VFs) 596 goto exit; 597 598 /* is PF driver loaded w/callback */ 599 if (!pdev->driver || !pdev->driver->sriov_configure) { 600 pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n"); 601 ret = -ENOENT; 602 goto exit; 603 } 604 605 if (num_vfs == 0) { 606 /* disable VFs */ 607 ret = pdev->driver->sriov_configure(pdev, 0); 608 goto exit; 609 } 610 611 /* enable VFs */ 612 if (pdev->sriov->num_VFs) { 613 pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n", 614 pdev->sriov->num_VFs, num_vfs); 615 ret = -EBUSY; 616 goto exit; 617 } 618 619 ret = pdev->driver->sriov_configure(pdev, num_vfs); 620 if (ret < 0) 621 goto exit; 622 623 if (ret != num_vfs) 624 pci_warn(pdev, "%d VFs requested; only %d enabled\n", 625 num_vfs, ret); 626 627 exit: 628 device_unlock(&pdev->dev); 629 630 if (ret < 0) 631 return ret; 632 633 return count; 634 } 635 636 static ssize_t sriov_offset_show(struct device *dev, 637 struct device_attribute *attr, 638 char *buf) 639 { 640 struct pci_dev *pdev = to_pci_dev(dev); 641 642 return sprintf(buf, "%u\n", pdev->sriov->offset); 643 } 644 645 static ssize_t sriov_stride_show(struct device *dev, 646 struct device_attribute *attr, 647 char *buf) 648 { 649 struct pci_dev *pdev = to_pci_dev(dev); 650 651 return sprintf(buf, "%u\n", pdev->sriov->stride); 652 } 653 654 static ssize_t sriov_vf_device_show(struct device *dev, 655 struct device_attribute *attr, 656 char *buf) 657 { 658 struct pci_dev *pdev = to_pci_dev(dev); 659 660 return sprintf(buf, "%x\n", pdev->sriov->vf_device); 661 } 662 663 static ssize_t sriov_drivers_autoprobe_show(struct device *dev, 664 struct device_attribute *attr, 665 char *buf) 666 { 667 struct pci_dev *pdev = to_pci_dev(dev); 668 669 return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe); 670 } 671 672 static ssize_t sriov_drivers_autoprobe_store(struct device *dev, 673 struct device_attribute *attr, 674 const char *buf, size_t count) 675 { 676 struct pci_dev *pdev = to_pci_dev(dev); 677 bool drivers_autoprobe; 678 679 if (kstrtobool(buf, &drivers_autoprobe) < 0) 680 return -EINVAL; 681 682 pdev->sriov->drivers_autoprobe = drivers_autoprobe; 683 684 return count; 685 } 686 687 static DEVICE_ATTR_RO(sriov_totalvfs); 688 static DEVICE_ATTR(sriov_numvfs, (S_IRUGO | S_IWUSR | S_IWGRP), 689 sriov_numvfs_show, sriov_numvfs_store); 690 static DEVICE_ATTR_RO(sriov_offset); 691 static DEVICE_ATTR_RO(sriov_stride); 692 static DEVICE_ATTR_RO(sriov_vf_device); 693 static DEVICE_ATTR(sriov_drivers_autoprobe, (S_IRUGO | S_IWUSR | S_IWGRP), 694 sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store); 695 #endif /* CONFIG_PCI_IOV */ 696 697 static ssize_t driver_override_store(struct device *dev, 698 struct device_attribute *attr, 699 const char *buf, size_t count) 700 { 701 struct pci_dev *pdev = to_pci_dev(dev); 702 char *driver_override, *old, *cp; 703 704 /* We need to keep extra room for a newline */ 705 if (count >= (PAGE_SIZE - 1)) 706 return -EINVAL; 707 708 driver_override = kstrndup(buf, count, GFP_KERNEL); 709 if (!driver_override) 710 return -ENOMEM; 711 712 cp = strchr(driver_override, '\n'); 713 if (cp) 714 *cp = '\0'; 715 716 device_lock(dev); 717 old = pdev->driver_override; 718 if (strlen(driver_override)) { 719 pdev->driver_override = driver_override; 720 } else { 721 kfree(driver_override); 722 pdev->driver_override = NULL; 723 } 724 device_unlock(dev); 725 726 kfree(old); 727 728 return count; 729 } 730 731 static ssize_t driver_override_show(struct device *dev, 732 struct device_attribute *attr, char *buf) 733 { 734 struct pci_dev *pdev = to_pci_dev(dev); 735 ssize_t len; 736 737 device_lock(dev); 738 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override); 739 device_unlock(dev); 740 return len; 741 } 742 static DEVICE_ATTR_RW(driver_override); 743 744 static struct attribute *pci_dev_attrs[] = { 745 &dev_attr_resource.attr, 746 &dev_attr_vendor.attr, 747 &dev_attr_device.attr, 748 &dev_attr_subsystem_vendor.attr, 749 &dev_attr_subsystem_device.attr, 750 &dev_attr_revision.attr, 751 &dev_attr_class.attr, 752 &dev_attr_irq.attr, 753 &dev_attr_local_cpus.attr, 754 &dev_attr_local_cpulist.attr, 755 &dev_attr_modalias.attr, 756 #ifdef CONFIG_NUMA 757 &dev_attr_numa_node.attr, 758 #endif 759 &dev_attr_dma_mask_bits.attr, 760 &dev_attr_consistent_dma_mask_bits.attr, 761 &dev_attr_enable.attr, 762 &dev_attr_broken_parity_status.attr, 763 &dev_attr_msi_bus.attr, 764 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 765 &dev_attr_d3cold_allowed.attr, 766 #endif 767 #ifdef CONFIG_OF 768 &dev_attr_devspec.attr, 769 #endif 770 &dev_attr_driver_override.attr, 771 &dev_attr_ari_enabled.attr, 772 NULL, 773 }; 774 775 static struct attribute *pci_bridge_attrs[] = { 776 &dev_attr_subordinate_bus_number.attr, 777 &dev_attr_secondary_bus_number.attr, 778 NULL, 779 }; 780 781 static struct attribute *pcie_dev_attrs[] = { 782 &dev_attr_current_link_speed.attr, 783 &dev_attr_current_link_width.attr, 784 &dev_attr_max_link_width.attr, 785 &dev_attr_max_link_speed.attr, 786 NULL, 787 }; 788 789 static struct attribute *pcibus_attrs[] = { 790 &dev_attr_bus_rescan.attr, 791 &dev_attr_cpuaffinity.attr, 792 &dev_attr_cpulistaffinity.attr, 793 NULL, 794 }; 795 796 static const struct attribute_group pcibus_group = { 797 .attrs = pcibus_attrs, 798 }; 799 800 const struct attribute_group *pcibus_groups[] = { 801 &pcibus_group, 802 NULL, 803 }; 804 805 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, 806 char *buf) 807 { 808 struct pci_dev *pdev = to_pci_dev(dev); 809 struct pci_dev *vga_dev = vga_default_device(); 810 811 if (vga_dev) 812 return sprintf(buf, "%u\n", (pdev == vga_dev)); 813 814 return sprintf(buf, "%u\n", 815 !!(pdev->resource[PCI_ROM_RESOURCE].flags & 816 IORESOURCE_ROM_SHADOW)); 817 } 818 static DEVICE_ATTR_RO(boot_vga); 819 820 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, 821 struct bin_attribute *bin_attr, char *buf, 822 loff_t off, size_t count) 823 { 824 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 825 unsigned int size = 64; 826 loff_t init_off = off; 827 u8 *data = (u8 *) buf; 828 829 /* Several chips lock up trying to read undefined config space */ 830 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN)) 831 size = dev->cfg_size; 832 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 833 size = 128; 834 835 if (off > size) 836 return 0; 837 if (off + count > size) { 838 size -= off; 839 count = size; 840 } else { 841 size = count; 842 } 843 844 pci_config_pm_runtime_get(dev); 845 846 if ((off & 1) && size) { 847 u8 val; 848 pci_user_read_config_byte(dev, off, &val); 849 data[off - init_off] = val; 850 off++; 851 size--; 852 } 853 854 if ((off & 3) && size > 2) { 855 u16 val; 856 pci_user_read_config_word(dev, off, &val); 857 data[off - init_off] = val & 0xff; 858 data[off - init_off + 1] = (val >> 8) & 0xff; 859 off += 2; 860 size -= 2; 861 } 862 863 while (size > 3) { 864 u32 val; 865 pci_user_read_config_dword(dev, off, &val); 866 data[off - init_off] = val & 0xff; 867 data[off - init_off + 1] = (val >> 8) & 0xff; 868 data[off - init_off + 2] = (val >> 16) & 0xff; 869 data[off - init_off + 3] = (val >> 24) & 0xff; 870 off += 4; 871 size -= 4; 872 } 873 874 if (size >= 2) { 875 u16 val; 876 pci_user_read_config_word(dev, off, &val); 877 data[off - init_off] = val & 0xff; 878 data[off - init_off + 1] = (val >> 8) & 0xff; 879 off += 2; 880 size -= 2; 881 } 882 883 if (size > 0) { 884 u8 val; 885 pci_user_read_config_byte(dev, off, &val); 886 data[off - init_off] = val; 887 off++; 888 --size; 889 } 890 891 pci_config_pm_runtime_put(dev); 892 893 return count; 894 } 895 896 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, 897 struct bin_attribute *bin_attr, char *buf, 898 loff_t off, size_t count) 899 { 900 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 901 unsigned int size = count; 902 loff_t init_off = off; 903 u8 *data = (u8 *) buf; 904 905 if (off > dev->cfg_size) 906 return 0; 907 if (off + count > dev->cfg_size) { 908 size = dev->cfg_size - off; 909 count = size; 910 } 911 912 pci_config_pm_runtime_get(dev); 913 914 if ((off & 1) && size) { 915 pci_user_write_config_byte(dev, off, data[off - init_off]); 916 off++; 917 size--; 918 } 919 920 if ((off & 3) && size > 2) { 921 u16 val = data[off - init_off]; 922 val |= (u16) data[off - init_off + 1] << 8; 923 pci_user_write_config_word(dev, off, val); 924 off += 2; 925 size -= 2; 926 } 927 928 while (size > 3) { 929 u32 val = data[off - init_off]; 930 val |= (u32) data[off - init_off + 1] << 8; 931 val |= (u32) data[off - init_off + 2] << 16; 932 val |= (u32) data[off - init_off + 3] << 24; 933 pci_user_write_config_dword(dev, off, val); 934 off += 4; 935 size -= 4; 936 } 937 938 if (size >= 2) { 939 u16 val = data[off - init_off]; 940 val |= (u16) data[off - init_off + 1] << 8; 941 pci_user_write_config_word(dev, off, val); 942 off += 2; 943 size -= 2; 944 } 945 946 if (size) { 947 pci_user_write_config_byte(dev, off, data[off - init_off]); 948 off++; 949 --size; 950 } 951 952 pci_config_pm_runtime_put(dev); 953 954 return count; 955 } 956 957 #ifdef HAVE_PCI_LEGACY 958 /** 959 * pci_read_legacy_io - read byte(s) from legacy I/O port space 960 * @filp: open sysfs file 961 * @kobj: kobject corresponding to file to read from 962 * @bin_attr: struct bin_attribute for this file 963 * @buf: buffer to store results 964 * @off: offset into legacy I/O port space 965 * @count: number of bytes to read 966 * 967 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific 968 * callback routine (pci_legacy_read). 969 */ 970 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, 971 struct bin_attribute *bin_attr, char *buf, 972 loff_t off, size_t count) 973 { 974 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 975 976 /* Only support 1, 2 or 4 byte accesses */ 977 if (count != 1 && count != 2 && count != 4) 978 return -EINVAL; 979 980 return pci_legacy_read(bus, off, (u32 *)buf, count); 981 } 982 983 /** 984 * pci_write_legacy_io - write byte(s) to legacy I/O port space 985 * @filp: open sysfs file 986 * @kobj: kobject corresponding to file to read from 987 * @bin_attr: struct bin_attribute for this file 988 * @buf: buffer containing value to be written 989 * @off: offset into legacy I/O port space 990 * @count: number of bytes to write 991 * 992 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific 993 * callback routine (pci_legacy_write). 994 */ 995 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj, 996 struct bin_attribute *bin_attr, char *buf, 997 loff_t off, size_t count) 998 { 999 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 1000 1001 /* Only support 1, 2 or 4 byte accesses */ 1002 if (count != 1 && count != 2 && count != 4) 1003 return -EINVAL; 1004 1005 return pci_legacy_write(bus, off, *(u32 *)buf, count); 1006 } 1007 1008 /** 1009 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space 1010 * @filp: open sysfs file 1011 * @kobj: kobject corresponding to device to be mapped 1012 * @attr: struct bin_attribute for this file 1013 * @vma: struct vm_area_struct passed to mmap 1014 * 1015 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap 1016 * legacy memory space (first meg of bus space) into application virtual 1017 * memory space. 1018 */ 1019 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj, 1020 struct bin_attribute *attr, 1021 struct vm_area_struct *vma) 1022 { 1023 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 1024 1025 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem); 1026 } 1027 1028 /** 1029 * pci_mmap_legacy_io - map legacy PCI IO into user memory space 1030 * @filp: open sysfs file 1031 * @kobj: kobject corresponding to device to be mapped 1032 * @attr: struct bin_attribute for this file 1033 * @vma: struct vm_area_struct passed to mmap 1034 * 1035 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap 1036 * legacy IO space (first meg of bus space) into application virtual 1037 * memory space. Returns -ENOSYS if the operation isn't supported 1038 */ 1039 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj, 1040 struct bin_attribute *attr, 1041 struct vm_area_struct *vma) 1042 { 1043 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 1044 1045 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); 1046 } 1047 1048 /** 1049 * pci_adjust_legacy_attr - adjustment of legacy file attributes 1050 * @b: bus to create files under 1051 * @mmap_type: I/O port or memory 1052 * 1053 * Stub implementation. Can be overridden by arch if necessary. 1054 */ 1055 void __weak pci_adjust_legacy_attr(struct pci_bus *b, 1056 enum pci_mmap_state mmap_type) 1057 { 1058 } 1059 1060 /** 1061 * pci_create_legacy_files - create legacy I/O port and memory files 1062 * @b: bus to create files under 1063 * 1064 * Some platforms allow access to legacy I/O port and ISA memory space on 1065 * a per-bus basis. This routine creates the files and ties them into 1066 * their associated read, write and mmap files from pci-sysfs.c 1067 * 1068 * On error unwind, but don't propagate the error to the caller 1069 * as it is ok to set up the PCI bus without these files. 1070 */ 1071 void pci_create_legacy_files(struct pci_bus *b) 1072 { 1073 int error; 1074 1075 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute), 1076 GFP_ATOMIC); 1077 if (!b->legacy_io) 1078 goto kzalloc_err; 1079 1080 sysfs_bin_attr_init(b->legacy_io); 1081 b->legacy_io->attr.name = "legacy_io"; 1082 b->legacy_io->size = 0xffff; 1083 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; 1084 b->legacy_io->read = pci_read_legacy_io; 1085 b->legacy_io->write = pci_write_legacy_io; 1086 b->legacy_io->mmap = pci_mmap_legacy_io; 1087 pci_adjust_legacy_attr(b, pci_mmap_io); 1088 error = device_create_bin_file(&b->dev, b->legacy_io); 1089 if (error) 1090 goto legacy_io_err; 1091 1092 /* Allocated above after the legacy_io struct */ 1093 b->legacy_mem = b->legacy_io + 1; 1094 sysfs_bin_attr_init(b->legacy_mem); 1095 b->legacy_mem->attr.name = "legacy_mem"; 1096 b->legacy_mem->size = 1024*1024; 1097 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; 1098 b->legacy_mem->mmap = pci_mmap_legacy_mem; 1099 pci_adjust_legacy_attr(b, pci_mmap_mem); 1100 error = device_create_bin_file(&b->dev, b->legacy_mem); 1101 if (error) 1102 goto legacy_mem_err; 1103 1104 return; 1105 1106 legacy_mem_err: 1107 device_remove_bin_file(&b->dev, b->legacy_io); 1108 legacy_io_err: 1109 kfree(b->legacy_io); 1110 b->legacy_io = NULL; 1111 kzalloc_err: 1112 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n"); 1113 } 1114 1115 void pci_remove_legacy_files(struct pci_bus *b) 1116 { 1117 if (b->legacy_io) { 1118 device_remove_bin_file(&b->dev, b->legacy_io); 1119 device_remove_bin_file(&b->dev, b->legacy_mem); 1120 kfree(b->legacy_io); /* both are allocated here */ 1121 } 1122 } 1123 #endif /* HAVE_PCI_LEGACY */ 1124 1125 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE) 1126 1127 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, 1128 enum pci_mmap_api mmap_api) 1129 { 1130 unsigned long nr, start, size; 1131 resource_size_t pci_start = 0, pci_end; 1132 1133 if (pci_resource_len(pdev, resno) == 0) 1134 return 0; 1135 nr = vma_pages(vma); 1136 start = vma->vm_pgoff; 1137 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; 1138 if (mmap_api == PCI_MMAP_PROCFS) { 1139 pci_resource_to_user(pdev, resno, &pdev->resource[resno], 1140 &pci_start, &pci_end); 1141 pci_start >>= PAGE_SHIFT; 1142 } 1143 if (start >= pci_start && start < pci_start + size && 1144 start + nr <= pci_start + size) 1145 return 1; 1146 return 0; 1147 } 1148 1149 /** 1150 * pci_mmap_resource - map a PCI resource into user memory space 1151 * @kobj: kobject for mapping 1152 * @attr: struct bin_attribute for the file being mapped 1153 * @vma: struct vm_area_struct passed into the mmap 1154 * @write_combine: 1 for write_combine mapping 1155 * 1156 * Use the regular PCI mapping routines to map a PCI resource into userspace. 1157 */ 1158 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, 1159 struct vm_area_struct *vma, int write_combine) 1160 { 1161 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1162 int bar = (unsigned long)attr->private; 1163 enum pci_mmap_state mmap_type; 1164 struct resource *res = &pdev->resource[bar]; 1165 1166 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start)) 1167 return -EINVAL; 1168 1169 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS)) 1170 return -EINVAL; 1171 1172 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; 1173 1174 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine); 1175 } 1176 1177 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj, 1178 struct bin_attribute *attr, 1179 struct vm_area_struct *vma) 1180 { 1181 return pci_mmap_resource(kobj, attr, vma, 0); 1182 } 1183 1184 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj, 1185 struct bin_attribute *attr, 1186 struct vm_area_struct *vma) 1187 { 1188 return pci_mmap_resource(kobj, attr, vma, 1); 1189 } 1190 1191 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, 1192 struct bin_attribute *attr, char *buf, 1193 loff_t off, size_t count, bool write) 1194 { 1195 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1196 int bar = (unsigned long)attr->private; 1197 unsigned long port = off; 1198 1199 port += pci_resource_start(pdev, bar); 1200 1201 if (port > pci_resource_end(pdev, bar)) 1202 return 0; 1203 1204 if (port + count - 1 > pci_resource_end(pdev, bar)) 1205 return -EINVAL; 1206 1207 switch (count) { 1208 case 1: 1209 if (write) 1210 outb(*(u8 *)buf, port); 1211 else 1212 *(u8 *)buf = inb(port); 1213 return 1; 1214 case 2: 1215 if (write) 1216 outw(*(u16 *)buf, port); 1217 else 1218 *(u16 *)buf = inw(port); 1219 return 2; 1220 case 4: 1221 if (write) 1222 outl(*(u32 *)buf, port); 1223 else 1224 *(u32 *)buf = inl(port); 1225 return 4; 1226 } 1227 return -EINVAL; 1228 } 1229 1230 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj, 1231 struct bin_attribute *attr, char *buf, 1232 loff_t off, size_t count) 1233 { 1234 return pci_resource_io(filp, kobj, attr, buf, off, count, false); 1235 } 1236 1237 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, 1238 struct bin_attribute *attr, char *buf, 1239 loff_t off, size_t count) 1240 { 1241 return pci_resource_io(filp, kobj, attr, buf, off, count, true); 1242 } 1243 1244 /** 1245 * pci_remove_resource_files - cleanup resource files 1246 * @pdev: dev to cleanup 1247 * 1248 * If we created resource files for @pdev, remove them from sysfs and 1249 * free their resources. 1250 */ 1251 static void pci_remove_resource_files(struct pci_dev *pdev) 1252 { 1253 int i; 1254 1255 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1256 struct bin_attribute *res_attr; 1257 1258 res_attr = pdev->res_attr[i]; 1259 if (res_attr) { 1260 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1261 kfree(res_attr); 1262 } 1263 1264 res_attr = pdev->res_attr_wc[i]; 1265 if (res_attr) { 1266 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1267 kfree(res_attr); 1268 } 1269 } 1270 } 1271 1272 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) 1273 { 1274 /* allocate attribute structure, piggyback attribute name */ 1275 int name_len = write_combine ? 13 : 10; 1276 struct bin_attribute *res_attr; 1277 char *res_attr_name; 1278 int retval; 1279 1280 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); 1281 if (!res_attr) 1282 return -ENOMEM; 1283 1284 res_attr_name = (char *)(res_attr + 1); 1285 1286 sysfs_bin_attr_init(res_attr); 1287 if (write_combine) { 1288 pdev->res_attr_wc[num] = res_attr; 1289 sprintf(res_attr_name, "resource%d_wc", num); 1290 res_attr->mmap = pci_mmap_resource_wc; 1291 } else { 1292 pdev->res_attr[num] = res_attr; 1293 sprintf(res_attr_name, "resource%d", num); 1294 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { 1295 res_attr->read = pci_read_resource_io; 1296 res_attr->write = pci_write_resource_io; 1297 if (arch_can_pci_mmap_io()) 1298 res_attr->mmap = pci_mmap_resource_uc; 1299 } else { 1300 res_attr->mmap = pci_mmap_resource_uc; 1301 } 1302 } 1303 res_attr->attr.name = res_attr_name; 1304 res_attr->attr.mode = S_IRUSR | S_IWUSR; 1305 res_attr->size = pci_resource_len(pdev, num); 1306 res_attr->private = (void *)(unsigned long)num; 1307 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); 1308 if (retval) 1309 kfree(res_attr); 1310 1311 return retval; 1312 } 1313 1314 /** 1315 * pci_create_resource_files - create resource files in sysfs for @dev 1316 * @pdev: dev in question 1317 * 1318 * Walk the resources in @pdev creating files for each resource available. 1319 */ 1320 static int pci_create_resource_files(struct pci_dev *pdev) 1321 { 1322 int i; 1323 int retval; 1324 1325 /* Expose the PCI resources from this device as files */ 1326 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1327 1328 /* skip empty resources */ 1329 if (!pci_resource_len(pdev, i)) 1330 continue; 1331 1332 retval = pci_create_attr(pdev, i, 0); 1333 /* for prefetchable resources, create a WC mappable file */ 1334 if (!retval && arch_can_pci_mmap_wc() && 1335 pdev->resource[i].flags & IORESOURCE_PREFETCH) 1336 retval = pci_create_attr(pdev, i, 1); 1337 if (retval) { 1338 pci_remove_resource_files(pdev); 1339 return retval; 1340 } 1341 } 1342 return 0; 1343 } 1344 #else /* !HAVE_PCI_MMAP */ 1345 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } 1346 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } 1347 #endif /* HAVE_PCI_MMAP */ 1348 1349 /** 1350 * pci_write_rom - used to enable access to the PCI ROM display 1351 * @filp: sysfs file 1352 * @kobj: kernel object handle 1353 * @bin_attr: struct bin_attribute for this file 1354 * @buf: user input 1355 * @off: file offset 1356 * @count: number of byte in input 1357 * 1358 * writing anything except 0 enables it 1359 */ 1360 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, 1361 struct bin_attribute *bin_attr, char *buf, 1362 loff_t off, size_t count) 1363 { 1364 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1365 1366 if ((off == 0) && (*buf == '0') && (count == 2)) 1367 pdev->rom_attr_enabled = 0; 1368 else 1369 pdev->rom_attr_enabled = 1; 1370 1371 return count; 1372 } 1373 1374 /** 1375 * pci_read_rom - read a PCI ROM 1376 * @filp: sysfs file 1377 * @kobj: kernel object handle 1378 * @bin_attr: struct bin_attribute for this file 1379 * @buf: where to put the data we read from the ROM 1380 * @off: file offset 1381 * @count: number of bytes to read 1382 * 1383 * Put @count bytes starting at @off into @buf from the ROM in the PCI 1384 * device corresponding to @kobj. 1385 */ 1386 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, 1387 struct bin_attribute *bin_attr, char *buf, 1388 loff_t off, size_t count) 1389 { 1390 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1391 void __iomem *rom; 1392 size_t size; 1393 1394 if (!pdev->rom_attr_enabled) 1395 return -EINVAL; 1396 1397 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ 1398 if (!rom || !size) 1399 return -EIO; 1400 1401 if (off >= size) 1402 count = 0; 1403 else { 1404 if (off + count > size) 1405 count = size - off; 1406 1407 memcpy_fromio(buf, rom + off, count); 1408 } 1409 pci_unmap_rom(pdev, rom); 1410 1411 return count; 1412 } 1413 1414 static const struct bin_attribute pci_config_attr = { 1415 .attr = { 1416 .name = "config", 1417 .mode = S_IRUGO | S_IWUSR, 1418 }, 1419 .size = PCI_CFG_SPACE_SIZE, 1420 .read = pci_read_config, 1421 .write = pci_write_config, 1422 }; 1423 1424 static const struct bin_attribute pcie_config_attr = { 1425 .attr = { 1426 .name = "config", 1427 .mode = S_IRUGO | S_IWUSR, 1428 }, 1429 .size = PCI_CFG_SPACE_EXP_SIZE, 1430 .read = pci_read_config, 1431 .write = pci_write_config, 1432 }; 1433 1434 static ssize_t reset_store(struct device *dev, struct device_attribute *attr, 1435 const char *buf, size_t count) 1436 { 1437 struct pci_dev *pdev = to_pci_dev(dev); 1438 unsigned long val; 1439 ssize_t result = kstrtoul(buf, 0, &val); 1440 1441 if (result < 0) 1442 return result; 1443 1444 if (val != 1) 1445 return -EINVAL; 1446 1447 pm_runtime_get_sync(dev); 1448 result = pci_reset_function(pdev); 1449 pm_runtime_put(dev); 1450 if (result < 0) 1451 return result; 1452 1453 return count; 1454 } 1455 1456 static DEVICE_ATTR(reset, 0200, NULL, reset_store); 1457 1458 static int pci_create_capabilities_sysfs(struct pci_dev *dev) 1459 { 1460 int retval; 1461 1462 pcie_vpd_create_sysfs_dev_files(dev); 1463 pcie_aspm_create_sysfs_dev_files(dev); 1464 1465 if (dev->reset_fn) { 1466 retval = device_create_file(&dev->dev, &dev_attr_reset); 1467 if (retval) 1468 goto error; 1469 } 1470 return 0; 1471 1472 error: 1473 pcie_aspm_remove_sysfs_dev_files(dev); 1474 pcie_vpd_remove_sysfs_dev_files(dev); 1475 return retval; 1476 } 1477 1478 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) 1479 { 1480 int retval; 1481 int rom_size; 1482 struct bin_attribute *attr; 1483 1484 if (!sysfs_initialized) 1485 return -EACCES; 1486 1487 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1488 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1489 else 1490 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); 1491 if (retval) 1492 goto err; 1493 1494 retval = pci_create_resource_files(pdev); 1495 if (retval) 1496 goto err_config_file; 1497 1498 /* If the device has a ROM, try to expose it in sysfs. */ 1499 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1500 if (rom_size) { 1501 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1502 if (!attr) { 1503 retval = -ENOMEM; 1504 goto err_resource_files; 1505 } 1506 sysfs_bin_attr_init(attr); 1507 attr->size = rom_size; 1508 attr->attr.name = "rom"; 1509 attr->attr.mode = S_IRUSR | S_IWUSR; 1510 attr->read = pci_read_rom; 1511 attr->write = pci_write_rom; 1512 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); 1513 if (retval) { 1514 kfree(attr); 1515 goto err_resource_files; 1516 } 1517 pdev->rom_attr = attr; 1518 } 1519 1520 /* add sysfs entries for various capabilities */ 1521 retval = pci_create_capabilities_sysfs(pdev); 1522 if (retval) 1523 goto err_rom_file; 1524 1525 pci_create_firmware_label_files(pdev); 1526 1527 return 0; 1528 1529 err_rom_file: 1530 if (pdev->rom_attr) { 1531 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1532 kfree(pdev->rom_attr); 1533 pdev->rom_attr = NULL; 1534 } 1535 err_resource_files: 1536 pci_remove_resource_files(pdev); 1537 err_config_file: 1538 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1539 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1540 else 1541 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1542 err: 1543 return retval; 1544 } 1545 1546 static void pci_remove_capabilities_sysfs(struct pci_dev *dev) 1547 { 1548 pcie_vpd_remove_sysfs_dev_files(dev); 1549 pcie_aspm_remove_sysfs_dev_files(dev); 1550 if (dev->reset_fn) { 1551 device_remove_file(&dev->dev, &dev_attr_reset); 1552 dev->reset_fn = 0; 1553 } 1554 } 1555 1556 /** 1557 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files 1558 * @pdev: device whose entries we should free 1559 * 1560 * Cleanup when @pdev is removed from sysfs. 1561 */ 1562 void pci_remove_sysfs_dev_files(struct pci_dev *pdev) 1563 { 1564 if (!sysfs_initialized) 1565 return; 1566 1567 pci_remove_capabilities_sysfs(pdev); 1568 1569 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1570 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1571 else 1572 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1573 1574 pci_remove_resource_files(pdev); 1575 1576 if (pdev->rom_attr) { 1577 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1578 kfree(pdev->rom_attr); 1579 pdev->rom_attr = NULL; 1580 } 1581 1582 pci_remove_firmware_label_files(pdev); 1583 } 1584 1585 static int __init pci_sysfs_init(void) 1586 { 1587 struct pci_dev *pdev = NULL; 1588 int retval; 1589 1590 sysfs_initialized = 1; 1591 for_each_pci_dev(pdev) { 1592 retval = pci_create_sysfs_dev_files(pdev); 1593 if (retval) { 1594 pci_dev_put(pdev); 1595 return retval; 1596 } 1597 } 1598 1599 return 0; 1600 } 1601 late_initcall(pci_sysfs_init); 1602 1603 static struct attribute *pci_dev_dev_attrs[] = { 1604 &dev_attr_boot_vga.attr, 1605 NULL, 1606 }; 1607 1608 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj, 1609 struct attribute *a, int n) 1610 { 1611 struct device *dev = kobj_to_dev(kobj); 1612 struct pci_dev *pdev = to_pci_dev(dev); 1613 1614 if (a == &dev_attr_boot_vga.attr) 1615 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 1616 return 0; 1617 1618 return a->mode; 1619 } 1620 1621 static struct attribute *pci_dev_hp_attrs[] = { 1622 &dev_attr_remove.attr, 1623 &dev_attr_rescan.attr, 1624 NULL, 1625 }; 1626 1627 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj, 1628 struct attribute *a, int n) 1629 { 1630 struct device *dev = kobj_to_dev(kobj); 1631 struct pci_dev *pdev = to_pci_dev(dev); 1632 1633 if (pdev->is_virtfn) 1634 return 0; 1635 1636 return a->mode; 1637 } 1638 1639 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj, 1640 struct attribute *a, int n) 1641 { 1642 struct device *dev = kobj_to_dev(kobj); 1643 struct pci_dev *pdev = to_pci_dev(dev); 1644 1645 if (pci_is_bridge(pdev)) 1646 return a->mode; 1647 1648 return 0; 1649 } 1650 1651 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj, 1652 struct attribute *a, int n) 1653 { 1654 struct device *dev = kobj_to_dev(kobj); 1655 struct pci_dev *pdev = to_pci_dev(dev); 1656 1657 if (pci_is_pcie(pdev)) 1658 return a->mode; 1659 1660 return 0; 1661 } 1662 1663 static const struct attribute_group pci_dev_group = { 1664 .attrs = pci_dev_attrs, 1665 }; 1666 1667 const struct attribute_group *pci_dev_groups[] = { 1668 &pci_dev_group, 1669 NULL, 1670 }; 1671 1672 static const struct attribute_group pci_bridge_group = { 1673 .attrs = pci_bridge_attrs, 1674 }; 1675 1676 const struct attribute_group *pci_bridge_groups[] = { 1677 &pci_bridge_group, 1678 NULL, 1679 }; 1680 1681 static const struct attribute_group pcie_dev_group = { 1682 .attrs = pcie_dev_attrs, 1683 }; 1684 1685 const struct attribute_group *pcie_dev_groups[] = { 1686 &pcie_dev_group, 1687 NULL, 1688 }; 1689 1690 static const struct attribute_group pci_dev_hp_attr_group = { 1691 .attrs = pci_dev_hp_attrs, 1692 .is_visible = pci_dev_hp_attrs_are_visible, 1693 }; 1694 1695 #ifdef CONFIG_PCI_IOV 1696 static struct attribute *sriov_dev_attrs[] = { 1697 &dev_attr_sriov_totalvfs.attr, 1698 &dev_attr_sriov_numvfs.attr, 1699 &dev_attr_sriov_offset.attr, 1700 &dev_attr_sriov_stride.attr, 1701 &dev_attr_sriov_vf_device.attr, 1702 &dev_attr_sriov_drivers_autoprobe.attr, 1703 NULL, 1704 }; 1705 1706 static umode_t sriov_attrs_are_visible(struct kobject *kobj, 1707 struct attribute *a, int n) 1708 { 1709 struct device *dev = kobj_to_dev(kobj); 1710 1711 if (!dev_is_pf(dev)) 1712 return 0; 1713 1714 return a->mode; 1715 } 1716 1717 static const struct attribute_group sriov_dev_attr_group = { 1718 .attrs = sriov_dev_attrs, 1719 .is_visible = sriov_attrs_are_visible, 1720 }; 1721 #endif /* CONFIG_PCI_IOV */ 1722 1723 static const struct attribute_group pci_dev_attr_group = { 1724 .attrs = pci_dev_dev_attrs, 1725 .is_visible = pci_dev_attrs_are_visible, 1726 }; 1727 1728 static const struct attribute_group pci_bridge_attr_group = { 1729 .attrs = pci_bridge_attrs, 1730 .is_visible = pci_bridge_attrs_are_visible, 1731 }; 1732 1733 static const struct attribute_group pcie_dev_attr_group = { 1734 .attrs = pcie_dev_attrs, 1735 .is_visible = pcie_dev_attrs_are_visible, 1736 }; 1737 1738 static const struct attribute_group *pci_dev_attr_groups[] = { 1739 &pci_dev_attr_group, 1740 &pci_dev_hp_attr_group, 1741 #ifdef CONFIG_PCI_IOV 1742 &sriov_dev_attr_group, 1743 #endif 1744 &pci_bridge_attr_group, 1745 &pcie_dev_attr_group, 1746 #ifdef CONFIG_PCIEAER 1747 &aer_stats_attr_group, 1748 #endif 1749 NULL, 1750 }; 1751 1752 const struct device_type pci_dev_type = { 1753 .groups = pci_dev_attr_groups, 1754 }; 1755