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_16_0GB: 186 speed = "16 GT/s"; 187 break; 188 case PCI_EXP_LNKSTA_CLS_8_0GB: 189 speed = "8 GT/s"; 190 break; 191 case PCI_EXP_LNKSTA_CLS_5_0GB: 192 speed = "5 GT/s"; 193 break; 194 case PCI_EXP_LNKSTA_CLS_2_5GB: 195 speed = "2.5 GT/s"; 196 break; 197 default: 198 speed = "Unknown speed"; 199 } 200 201 return sprintf(buf, "%s\n", speed); 202 } 203 static DEVICE_ATTR_RO(current_link_speed); 204 205 static ssize_t current_link_width_show(struct device *dev, 206 struct device_attribute *attr, char *buf) 207 { 208 struct pci_dev *pci_dev = to_pci_dev(dev); 209 u16 linkstat; 210 int err; 211 212 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat); 213 if (err) 214 return -EINVAL; 215 216 return sprintf(buf, "%u\n", 217 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT); 218 } 219 static DEVICE_ATTR_RO(current_link_width); 220 221 static ssize_t secondary_bus_number_show(struct device *dev, 222 struct device_attribute *attr, 223 char *buf) 224 { 225 struct pci_dev *pci_dev = to_pci_dev(dev); 226 u8 sec_bus; 227 int err; 228 229 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus); 230 if (err) 231 return -EINVAL; 232 233 return sprintf(buf, "%u\n", sec_bus); 234 } 235 static DEVICE_ATTR_RO(secondary_bus_number); 236 237 static ssize_t subordinate_bus_number_show(struct device *dev, 238 struct device_attribute *attr, 239 char *buf) 240 { 241 struct pci_dev *pci_dev = to_pci_dev(dev); 242 u8 sub_bus; 243 int err; 244 245 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus); 246 if (err) 247 return -EINVAL; 248 249 return sprintf(buf, "%u\n", sub_bus); 250 } 251 static DEVICE_ATTR_RO(subordinate_bus_number); 252 253 static ssize_t ari_enabled_show(struct device *dev, 254 struct device_attribute *attr, 255 char *buf) 256 { 257 struct pci_dev *pci_dev = to_pci_dev(dev); 258 259 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus)); 260 } 261 static DEVICE_ATTR_RO(ari_enabled); 262 263 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 264 char *buf) 265 { 266 struct pci_dev *pci_dev = to_pci_dev(dev); 267 268 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n", 269 pci_dev->vendor, pci_dev->device, 270 pci_dev->subsystem_vendor, pci_dev->subsystem_device, 271 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), 272 (u8)(pci_dev->class)); 273 } 274 static DEVICE_ATTR_RO(modalias); 275 276 static ssize_t enable_store(struct device *dev, struct device_attribute *attr, 277 const char *buf, size_t count) 278 { 279 struct pci_dev *pdev = to_pci_dev(dev); 280 unsigned long val; 281 ssize_t result = kstrtoul(buf, 0, &val); 282 283 if (result < 0) 284 return result; 285 286 /* this can crash the machine when done on the "wrong" device */ 287 if (!capable(CAP_SYS_ADMIN)) 288 return -EPERM; 289 290 device_lock(dev); 291 if (dev->driver) 292 result = -EBUSY; 293 else if (val) 294 result = pci_enable_device(pdev); 295 else if (pci_is_enabled(pdev)) 296 pci_disable_device(pdev); 297 else 298 result = -EIO; 299 device_unlock(dev); 300 301 return result < 0 ? result : count; 302 } 303 304 static ssize_t enable_show(struct device *dev, struct device_attribute *attr, 305 char *buf) 306 { 307 struct pci_dev *pdev; 308 309 pdev = to_pci_dev(dev); 310 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt)); 311 } 312 static DEVICE_ATTR_RW(enable); 313 314 #ifdef CONFIG_NUMA 315 static ssize_t numa_node_store(struct device *dev, 316 struct device_attribute *attr, const char *buf, 317 size_t count) 318 { 319 struct pci_dev *pdev = to_pci_dev(dev); 320 int node, ret; 321 322 if (!capable(CAP_SYS_ADMIN)) 323 return -EPERM; 324 325 ret = kstrtoint(buf, 0, &node); 326 if (ret) 327 return ret; 328 329 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES) 330 return -EINVAL; 331 332 if (node != NUMA_NO_NODE && !node_online(node)) 333 return -EINVAL; 334 335 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); 336 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.", 337 node); 338 339 dev->numa_node = node; 340 return count; 341 } 342 343 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, 344 char *buf) 345 { 346 return sprintf(buf, "%d\n", dev->numa_node); 347 } 348 static DEVICE_ATTR_RW(numa_node); 349 #endif 350 351 static ssize_t dma_mask_bits_show(struct device *dev, 352 struct device_attribute *attr, char *buf) 353 { 354 struct pci_dev *pdev = to_pci_dev(dev); 355 356 return sprintf(buf, "%d\n", fls64(pdev->dma_mask)); 357 } 358 static DEVICE_ATTR_RO(dma_mask_bits); 359 360 static ssize_t consistent_dma_mask_bits_show(struct device *dev, 361 struct device_attribute *attr, 362 char *buf) 363 { 364 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask)); 365 } 366 static DEVICE_ATTR_RO(consistent_dma_mask_bits); 367 368 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr, 369 char *buf) 370 { 371 struct pci_dev *pdev = to_pci_dev(dev); 372 struct pci_bus *subordinate = pdev->subordinate; 373 374 return sprintf(buf, "%u\n", subordinate ? 375 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) 376 : !pdev->no_msi); 377 } 378 379 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr, 380 const char *buf, size_t count) 381 { 382 struct pci_dev *pdev = to_pci_dev(dev); 383 struct pci_bus *subordinate = pdev->subordinate; 384 unsigned long val; 385 386 if (kstrtoul(buf, 0, &val) < 0) 387 return -EINVAL; 388 389 if (!capable(CAP_SYS_ADMIN)) 390 return -EPERM; 391 392 /* 393 * "no_msi" and "bus_flags" only affect what happens when a driver 394 * requests MSI or MSI-X. They don't affect any drivers that have 395 * already requested MSI or MSI-X. 396 */ 397 if (!subordinate) { 398 pdev->no_msi = !val; 399 pci_info(pdev, "MSI/MSI-X %s for future drivers\n", 400 val ? "allowed" : "disallowed"); 401 return count; 402 } 403 404 if (val) 405 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; 406 else 407 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; 408 409 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n", 410 val ? "allowed" : "disallowed"); 411 return count; 412 } 413 static DEVICE_ATTR_RW(msi_bus); 414 415 static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count) 416 { 417 unsigned long val; 418 struct pci_bus *b = NULL; 419 420 if (kstrtoul(buf, 0, &val) < 0) 421 return -EINVAL; 422 423 if (val) { 424 pci_lock_rescan_remove(); 425 while ((b = pci_find_next_bus(b)) != NULL) 426 pci_rescan_bus(b); 427 pci_unlock_rescan_remove(); 428 } 429 return count; 430 } 431 static BUS_ATTR_WO(rescan); 432 433 static struct attribute *pci_bus_attrs[] = { 434 &bus_attr_rescan.attr, 435 NULL, 436 }; 437 438 static const struct attribute_group pci_bus_group = { 439 .attrs = pci_bus_attrs, 440 }; 441 442 const struct attribute_group *pci_bus_groups[] = { 443 &pci_bus_group, 444 NULL, 445 }; 446 447 static ssize_t dev_rescan_store(struct device *dev, 448 struct device_attribute *attr, const char *buf, 449 size_t count) 450 { 451 unsigned long val; 452 struct pci_dev *pdev = to_pci_dev(dev); 453 454 if (kstrtoul(buf, 0, &val) < 0) 455 return -EINVAL; 456 457 if (val) { 458 pci_lock_rescan_remove(); 459 pci_rescan_bus(pdev->bus); 460 pci_unlock_rescan_remove(); 461 } 462 return count; 463 } 464 static struct device_attribute dev_rescan_attr = __ATTR(rescan, 465 (S_IWUSR|S_IWGRP), 466 NULL, dev_rescan_store); 467 468 static ssize_t remove_store(struct device *dev, struct device_attribute *attr, 469 const char *buf, size_t count) 470 { 471 unsigned long val; 472 473 if (kstrtoul(buf, 0, &val) < 0) 474 return -EINVAL; 475 476 if (val && device_remove_file_self(dev, attr)) 477 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); 478 return count; 479 } 480 static struct device_attribute dev_remove_attr = __ATTR(remove, 481 (S_IWUSR|S_IWGRP), 482 NULL, 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(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 struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs); 688 static struct device_attribute sriov_numvfs_attr = 689 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP), 690 sriov_numvfs_show, sriov_numvfs_store); 691 static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset); 692 static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride); 693 static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device); 694 static struct device_attribute sriov_drivers_autoprobe_attr = 695 __ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP), 696 sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store); 697 #endif /* CONFIG_PCI_IOV */ 698 699 static ssize_t driver_override_store(struct device *dev, 700 struct device_attribute *attr, 701 const char *buf, size_t count) 702 { 703 struct pci_dev *pdev = to_pci_dev(dev); 704 char *driver_override, *old, *cp; 705 706 /* We need to keep extra room for a newline */ 707 if (count >= (PAGE_SIZE - 1)) 708 return -EINVAL; 709 710 driver_override = kstrndup(buf, count, GFP_KERNEL); 711 if (!driver_override) 712 return -ENOMEM; 713 714 cp = strchr(driver_override, '\n'); 715 if (cp) 716 *cp = '\0'; 717 718 device_lock(dev); 719 old = pdev->driver_override; 720 if (strlen(driver_override)) { 721 pdev->driver_override = driver_override; 722 } else { 723 kfree(driver_override); 724 pdev->driver_override = NULL; 725 } 726 device_unlock(dev); 727 728 kfree(old); 729 730 return count; 731 } 732 733 static ssize_t driver_override_show(struct device *dev, 734 struct device_attribute *attr, char *buf) 735 { 736 struct pci_dev *pdev = to_pci_dev(dev); 737 ssize_t len; 738 739 device_lock(dev); 740 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override); 741 device_unlock(dev); 742 return len; 743 } 744 static DEVICE_ATTR_RW(driver_override); 745 746 static struct attribute *pci_dev_attrs[] = { 747 &dev_attr_resource.attr, 748 &dev_attr_vendor.attr, 749 &dev_attr_device.attr, 750 &dev_attr_subsystem_vendor.attr, 751 &dev_attr_subsystem_device.attr, 752 &dev_attr_revision.attr, 753 &dev_attr_class.attr, 754 &dev_attr_irq.attr, 755 &dev_attr_local_cpus.attr, 756 &dev_attr_local_cpulist.attr, 757 &dev_attr_modalias.attr, 758 #ifdef CONFIG_NUMA 759 &dev_attr_numa_node.attr, 760 #endif 761 &dev_attr_dma_mask_bits.attr, 762 &dev_attr_consistent_dma_mask_bits.attr, 763 &dev_attr_enable.attr, 764 &dev_attr_broken_parity_status.attr, 765 &dev_attr_msi_bus.attr, 766 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 767 &dev_attr_d3cold_allowed.attr, 768 #endif 769 #ifdef CONFIG_OF 770 &dev_attr_devspec.attr, 771 #endif 772 &dev_attr_driver_override.attr, 773 &dev_attr_ari_enabled.attr, 774 NULL, 775 }; 776 777 static struct attribute *pci_bridge_attrs[] = { 778 &dev_attr_subordinate_bus_number.attr, 779 &dev_attr_secondary_bus_number.attr, 780 NULL, 781 }; 782 783 static struct attribute *pcie_dev_attrs[] = { 784 &dev_attr_current_link_speed.attr, 785 &dev_attr_current_link_width.attr, 786 &dev_attr_max_link_width.attr, 787 &dev_attr_max_link_speed.attr, 788 NULL, 789 }; 790 791 static struct attribute *pcibus_attrs[] = { 792 &dev_attr_rescan.attr, 793 &dev_attr_cpuaffinity.attr, 794 &dev_attr_cpulistaffinity.attr, 795 NULL, 796 }; 797 798 static const struct attribute_group pcibus_group = { 799 .attrs = pcibus_attrs, 800 }; 801 802 const struct attribute_group *pcibus_groups[] = { 803 &pcibus_group, 804 NULL, 805 }; 806 807 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, 808 char *buf) 809 { 810 struct pci_dev *pdev = to_pci_dev(dev); 811 struct pci_dev *vga_dev = vga_default_device(); 812 813 if (vga_dev) 814 return sprintf(buf, "%u\n", (pdev == vga_dev)); 815 816 return sprintf(buf, "%u\n", 817 !!(pdev->resource[PCI_ROM_RESOURCE].flags & 818 IORESOURCE_ROM_SHADOW)); 819 } 820 static struct device_attribute vga_attr = __ATTR_RO(boot_vga); 821 822 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, 823 struct bin_attribute *bin_attr, char *buf, 824 loff_t off, size_t count) 825 { 826 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 827 unsigned int size = 64; 828 loff_t init_off = off; 829 u8 *data = (u8 *) buf; 830 831 /* Several chips lock up trying to read undefined config space */ 832 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN)) 833 size = dev->cfg_size; 834 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 835 size = 128; 836 837 if (off > size) 838 return 0; 839 if (off + count > size) { 840 size -= off; 841 count = size; 842 } else { 843 size = count; 844 } 845 846 pci_config_pm_runtime_get(dev); 847 848 if ((off & 1) && size) { 849 u8 val; 850 pci_user_read_config_byte(dev, off, &val); 851 data[off - init_off] = val; 852 off++; 853 size--; 854 } 855 856 if ((off & 3) && size > 2) { 857 u16 val; 858 pci_user_read_config_word(dev, off, &val); 859 data[off - init_off] = val & 0xff; 860 data[off - init_off + 1] = (val >> 8) & 0xff; 861 off += 2; 862 size -= 2; 863 } 864 865 while (size > 3) { 866 u32 val; 867 pci_user_read_config_dword(dev, off, &val); 868 data[off - init_off] = val & 0xff; 869 data[off - init_off + 1] = (val >> 8) & 0xff; 870 data[off - init_off + 2] = (val >> 16) & 0xff; 871 data[off - init_off + 3] = (val >> 24) & 0xff; 872 off += 4; 873 size -= 4; 874 } 875 876 if (size >= 2) { 877 u16 val; 878 pci_user_read_config_word(dev, off, &val); 879 data[off - init_off] = val & 0xff; 880 data[off - init_off + 1] = (val >> 8) & 0xff; 881 off += 2; 882 size -= 2; 883 } 884 885 if (size > 0) { 886 u8 val; 887 pci_user_read_config_byte(dev, off, &val); 888 data[off - init_off] = val; 889 off++; 890 --size; 891 } 892 893 pci_config_pm_runtime_put(dev); 894 895 return count; 896 } 897 898 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, 899 struct bin_attribute *bin_attr, char *buf, 900 loff_t off, size_t count) 901 { 902 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 903 unsigned int size = count; 904 loff_t init_off = off; 905 u8 *data = (u8 *) buf; 906 int ret; 907 908 ret = security_locked_down(LOCKDOWN_PCI_ACCESS); 909 if (ret) 910 return ret; 911 912 if (off > dev->cfg_size) 913 return 0; 914 if (off + count > dev->cfg_size) { 915 size = dev->cfg_size - off; 916 count = size; 917 } 918 919 pci_config_pm_runtime_get(dev); 920 921 if ((off & 1) && size) { 922 pci_user_write_config_byte(dev, off, data[off - init_off]); 923 off++; 924 size--; 925 } 926 927 if ((off & 3) && size > 2) { 928 u16 val = data[off - init_off]; 929 val |= (u16) data[off - init_off + 1] << 8; 930 pci_user_write_config_word(dev, off, val); 931 off += 2; 932 size -= 2; 933 } 934 935 while (size > 3) { 936 u32 val = data[off - init_off]; 937 val |= (u32) data[off - init_off + 1] << 8; 938 val |= (u32) data[off - init_off + 2] << 16; 939 val |= (u32) data[off - init_off + 3] << 24; 940 pci_user_write_config_dword(dev, off, val); 941 off += 4; 942 size -= 4; 943 } 944 945 if (size >= 2) { 946 u16 val = data[off - init_off]; 947 val |= (u16) data[off - init_off + 1] << 8; 948 pci_user_write_config_word(dev, off, val); 949 off += 2; 950 size -= 2; 951 } 952 953 if (size) { 954 pci_user_write_config_byte(dev, off, data[off - init_off]); 955 off++; 956 --size; 957 } 958 959 pci_config_pm_runtime_put(dev); 960 961 return count; 962 } 963 964 #ifdef HAVE_PCI_LEGACY 965 /** 966 * pci_read_legacy_io - read byte(s) from legacy I/O port space 967 * @filp: open sysfs file 968 * @kobj: kobject corresponding to file to read from 969 * @bin_attr: struct bin_attribute for this file 970 * @buf: buffer to store results 971 * @off: offset into legacy I/O port space 972 * @count: number of bytes to read 973 * 974 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific 975 * callback routine (pci_legacy_read). 976 */ 977 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, 978 struct bin_attribute *bin_attr, char *buf, 979 loff_t off, size_t count) 980 { 981 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 982 983 /* Only support 1, 2 or 4 byte accesses */ 984 if (count != 1 && count != 2 && count != 4) 985 return -EINVAL; 986 987 return pci_legacy_read(bus, off, (u32 *)buf, count); 988 } 989 990 /** 991 * pci_write_legacy_io - write byte(s) to legacy I/O port space 992 * @filp: open sysfs file 993 * @kobj: kobject corresponding to file to read from 994 * @bin_attr: struct bin_attribute for this file 995 * @buf: buffer containing value to be written 996 * @off: offset into legacy I/O port space 997 * @count: number of bytes to write 998 * 999 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific 1000 * callback routine (pci_legacy_write). 1001 */ 1002 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj, 1003 struct bin_attribute *bin_attr, char *buf, 1004 loff_t off, size_t count) 1005 { 1006 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 1007 1008 /* Only support 1, 2 or 4 byte accesses */ 1009 if (count != 1 && count != 2 && count != 4) 1010 return -EINVAL; 1011 1012 return pci_legacy_write(bus, off, *(u32 *)buf, count); 1013 } 1014 1015 /** 1016 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space 1017 * @filp: open sysfs file 1018 * @kobj: kobject corresponding to device to be mapped 1019 * @attr: struct bin_attribute for this file 1020 * @vma: struct vm_area_struct passed to mmap 1021 * 1022 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap 1023 * legacy memory space (first meg of bus space) into application virtual 1024 * memory space. 1025 */ 1026 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj, 1027 struct bin_attribute *attr, 1028 struct vm_area_struct *vma) 1029 { 1030 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 1031 1032 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem); 1033 } 1034 1035 /** 1036 * pci_mmap_legacy_io - map legacy PCI IO into user memory space 1037 * @filp: open sysfs file 1038 * @kobj: kobject corresponding to device to be mapped 1039 * @attr: struct bin_attribute for this file 1040 * @vma: struct vm_area_struct passed to mmap 1041 * 1042 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap 1043 * legacy IO space (first meg of bus space) into application virtual 1044 * memory space. Returns -ENOSYS if the operation isn't supported 1045 */ 1046 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj, 1047 struct bin_attribute *attr, 1048 struct vm_area_struct *vma) 1049 { 1050 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 1051 1052 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); 1053 } 1054 1055 /** 1056 * pci_adjust_legacy_attr - adjustment of legacy file attributes 1057 * @b: bus to create files under 1058 * @mmap_type: I/O port or memory 1059 * 1060 * Stub implementation. Can be overridden by arch if necessary. 1061 */ 1062 void __weak pci_adjust_legacy_attr(struct pci_bus *b, 1063 enum pci_mmap_state mmap_type) 1064 { 1065 } 1066 1067 /** 1068 * pci_create_legacy_files - create legacy I/O port and memory files 1069 * @b: bus to create files under 1070 * 1071 * Some platforms allow access to legacy I/O port and ISA memory space on 1072 * a per-bus basis. This routine creates the files and ties them into 1073 * their associated read, write and mmap files from pci-sysfs.c 1074 * 1075 * On error unwind, but don't propagate the error to the caller 1076 * as it is ok to set up the PCI bus without these files. 1077 */ 1078 void pci_create_legacy_files(struct pci_bus *b) 1079 { 1080 int error; 1081 1082 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute), 1083 GFP_ATOMIC); 1084 if (!b->legacy_io) 1085 goto kzalloc_err; 1086 1087 sysfs_bin_attr_init(b->legacy_io); 1088 b->legacy_io->attr.name = "legacy_io"; 1089 b->legacy_io->size = 0xffff; 1090 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; 1091 b->legacy_io->read = pci_read_legacy_io; 1092 b->legacy_io->write = pci_write_legacy_io; 1093 b->legacy_io->mmap = pci_mmap_legacy_io; 1094 pci_adjust_legacy_attr(b, pci_mmap_io); 1095 error = device_create_bin_file(&b->dev, b->legacy_io); 1096 if (error) 1097 goto legacy_io_err; 1098 1099 /* Allocated above after the legacy_io struct */ 1100 b->legacy_mem = b->legacy_io + 1; 1101 sysfs_bin_attr_init(b->legacy_mem); 1102 b->legacy_mem->attr.name = "legacy_mem"; 1103 b->legacy_mem->size = 1024*1024; 1104 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; 1105 b->legacy_mem->mmap = pci_mmap_legacy_mem; 1106 pci_adjust_legacy_attr(b, pci_mmap_mem); 1107 error = device_create_bin_file(&b->dev, b->legacy_mem); 1108 if (error) 1109 goto legacy_mem_err; 1110 1111 return; 1112 1113 legacy_mem_err: 1114 device_remove_bin_file(&b->dev, b->legacy_io); 1115 legacy_io_err: 1116 kfree(b->legacy_io); 1117 b->legacy_io = NULL; 1118 kzalloc_err: 1119 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n"); 1120 } 1121 1122 void pci_remove_legacy_files(struct pci_bus *b) 1123 { 1124 if (b->legacy_io) { 1125 device_remove_bin_file(&b->dev, b->legacy_io); 1126 device_remove_bin_file(&b->dev, b->legacy_mem); 1127 kfree(b->legacy_io); /* both are allocated here */ 1128 } 1129 } 1130 #endif /* HAVE_PCI_LEGACY */ 1131 1132 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE) 1133 1134 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, 1135 enum pci_mmap_api mmap_api) 1136 { 1137 unsigned long nr, start, size; 1138 resource_size_t pci_start = 0, pci_end; 1139 1140 if (pci_resource_len(pdev, resno) == 0) 1141 return 0; 1142 nr = vma_pages(vma); 1143 start = vma->vm_pgoff; 1144 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; 1145 if (mmap_api == PCI_MMAP_PROCFS) { 1146 pci_resource_to_user(pdev, resno, &pdev->resource[resno], 1147 &pci_start, &pci_end); 1148 pci_start >>= PAGE_SHIFT; 1149 } 1150 if (start >= pci_start && start < pci_start + size && 1151 start + nr <= pci_start + size) 1152 return 1; 1153 return 0; 1154 } 1155 1156 /** 1157 * pci_mmap_resource - map a PCI resource into user memory space 1158 * @kobj: kobject for mapping 1159 * @attr: struct bin_attribute for the file being mapped 1160 * @vma: struct vm_area_struct passed into the mmap 1161 * @write_combine: 1 for write_combine mapping 1162 * 1163 * Use the regular PCI mapping routines to map a PCI resource into userspace. 1164 */ 1165 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, 1166 struct vm_area_struct *vma, int write_combine) 1167 { 1168 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1169 int bar = (unsigned long)attr->private; 1170 enum pci_mmap_state mmap_type; 1171 struct resource *res = &pdev->resource[bar]; 1172 int ret; 1173 1174 ret = security_locked_down(LOCKDOWN_PCI_ACCESS); 1175 if (ret) 1176 return ret; 1177 1178 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start)) 1179 return -EINVAL; 1180 1181 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS)) 1182 return -EINVAL; 1183 1184 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; 1185 1186 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine); 1187 } 1188 1189 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj, 1190 struct bin_attribute *attr, 1191 struct vm_area_struct *vma) 1192 { 1193 return pci_mmap_resource(kobj, attr, vma, 0); 1194 } 1195 1196 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj, 1197 struct bin_attribute *attr, 1198 struct vm_area_struct *vma) 1199 { 1200 return pci_mmap_resource(kobj, attr, vma, 1); 1201 } 1202 1203 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, 1204 struct bin_attribute *attr, char *buf, 1205 loff_t off, size_t count, bool write) 1206 { 1207 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1208 int bar = (unsigned long)attr->private; 1209 unsigned long port = off; 1210 1211 port += pci_resource_start(pdev, bar); 1212 1213 if (port > pci_resource_end(pdev, bar)) 1214 return 0; 1215 1216 if (port + count - 1 > pci_resource_end(pdev, bar)) 1217 return -EINVAL; 1218 1219 switch (count) { 1220 case 1: 1221 if (write) 1222 outb(*(u8 *)buf, port); 1223 else 1224 *(u8 *)buf = inb(port); 1225 return 1; 1226 case 2: 1227 if (write) 1228 outw(*(u16 *)buf, port); 1229 else 1230 *(u16 *)buf = inw(port); 1231 return 2; 1232 case 4: 1233 if (write) 1234 outl(*(u32 *)buf, port); 1235 else 1236 *(u32 *)buf = inl(port); 1237 return 4; 1238 } 1239 return -EINVAL; 1240 } 1241 1242 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj, 1243 struct bin_attribute *attr, char *buf, 1244 loff_t off, size_t count) 1245 { 1246 return pci_resource_io(filp, kobj, attr, buf, off, count, false); 1247 } 1248 1249 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, 1250 struct bin_attribute *attr, char *buf, 1251 loff_t off, size_t count) 1252 { 1253 int ret; 1254 1255 ret = security_locked_down(LOCKDOWN_PCI_ACCESS); 1256 if (ret) 1257 return ret; 1258 1259 return pci_resource_io(filp, kobj, attr, buf, off, count, true); 1260 } 1261 1262 /** 1263 * pci_remove_resource_files - cleanup resource files 1264 * @pdev: dev to cleanup 1265 * 1266 * If we created resource files for @pdev, remove them from sysfs and 1267 * free their resources. 1268 */ 1269 static void pci_remove_resource_files(struct pci_dev *pdev) 1270 { 1271 int i; 1272 1273 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1274 struct bin_attribute *res_attr; 1275 1276 res_attr = pdev->res_attr[i]; 1277 if (res_attr) { 1278 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1279 kfree(res_attr); 1280 } 1281 1282 res_attr = pdev->res_attr_wc[i]; 1283 if (res_attr) { 1284 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1285 kfree(res_attr); 1286 } 1287 } 1288 } 1289 1290 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) 1291 { 1292 /* allocate attribute structure, piggyback attribute name */ 1293 int name_len = write_combine ? 13 : 10; 1294 struct bin_attribute *res_attr; 1295 char *res_attr_name; 1296 int retval; 1297 1298 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); 1299 if (!res_attr) 1300 return -ENOMEM; 1301 1302 res_attr_name = (char *)(res_attr + 1); 1303 1304 sysfs_bin_attr_init(res_attr); 1305 if (write_combine) { 1306 pdev->res_attr_wc[num] = res_attr; 1307 sprintf(res_attr_name, "resource%d_wc", num); 1308 res_attr->mmap = pci_mmap_resource_wc; 1309 } else { 1310 pdev->res_attr[num] = res_attr; 1311 sprintf(res_attr_name, "resource%d", num); 1312 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { 1313 res_attr->read = pci_read_resource_io; 1314 res_attr->write = pci_write_resource_io; 1315 if (arch_can_pci_mmap_io()) 1316 res_attr->mmap = pci_mmap_resource_uc; 1317 } else { 1318 res_attr->mmap = pci_mmap_resource_uc; 1319 } 1320 } 1321 res_attr->attr.name = res_attr_name; 1322 res_attr->attr.mode = S_IRUSR | S_IWUSR; 1323 res_attr->size = pci_resource_len(pdev, num); 1324 res_attr->private = (void *)(unsigned long)num; 1325 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); 1326 if (retval) 1327 kfree(res_attr); 1328 1329 return retval; 1330 } 1331 1332 /** 1333 * pci_create_resource_files - create resource files in sysfs for @dev 1334 * @pdev: dev in question 1335 * 1336 * Walk the resources in @pdev creating files for each resource available. 1337 */ 1338 static int pci_create_resource_files(struct pci_dev *pdev) 1339 { 1340 int i; 1341 int retval; 1342 1343 /* Expose the PCI resources from this device as files */ 1344 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1345 1346 /* skip empty resources */ 1347 if (!pci_resource_len(pdev, i)) 1348 continue; 1349 1350 retval = pci_create_attr(pdev, i, 0); 1351 /* for prefetchable resources, create a WC mappable file */ 1352 if (!retval && arch_can_pci_mmap_wc() && 1353 pdev->resource[i].flags & IORESOURCE_PREFETCH) 1354 retval = pci_create_attr(pdev, i, 1); 1355 if (retval) { 1356 pci_remove_resource_files(pdev); 1357 return retval; 1358 } 1359 } 1360 return 0; 1361 } 1362 #else /* !HAVE_PCI_MMAP */ 1363 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } 1364 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } 1365 #endif /* HAVE_PCI_MMAP */ 1366 1367 /** 1368 * pci_write_rom - used to enable access to the PCI ROM display 1369 * @filp: sysfs file 1370 * @kobj: kernel object handle 1371 * @bin_attr: struct bin_attribute for this file 1372 * @buf: user input 1373 * @off: file offset 1374 * @count: number of byte in input 1375 * 1376 * writing anything except 0 enables it 1377 */ 1378 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, 1379 struct bin_attribute *bin_attr, char *buf, 1380 loff_t off, size_t count) 1381 { 1382 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1383 1384 if ((off == 0) && (*buf == '0') && (count == 2)) 1385 pdev->rom_attr_enabled = 0; 1386 else 1387 pdev->rom_attr_enabled = 1; 1388 1389 return count; 1390 } 1391 1392 /** 1393 * pci_read_rom - read a PCI ROM 1394 * @filp: sysfs file 1395 * @kobj: kernel object handle 1396 * @bin_attr: struct bin_attribute for this file 1397 * @buf: where to put the data we read from the ROM 1398 * @off: file offset 1399 * @count: number of bytes to read 1400 * 1401 * Put @count bytes starting at @off into @buf from the ROM in the PCI 1402 * device corresponding to @kobj. 1403 */ 1404 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, 1405 struct bin_attribute *bin_attr, char *buf, 1406 loff_t off, size_t count) 1407 { 1408 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1409 void __iomem *rom; 1410 size_t size; 1411 1412 if (!pdev->rom_attr_enabled) 1413 return -EINVAL; 1414 1415 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ 1416 if (!rom || !size) 1417 return -EIO; 1418 1419 if (off >= size) 1420 count = 0; 1421 else { 1422 if (off + count > size) 1423 count = size - off; 1424 1425 memcpy_fromio(buf, rom + off, count); 1426 } 1427 pci_unmap_rom(pdev, rom); 1428 1429 return count; 1430 } 1431 1432 static const struct bin_attribute pci_config_attr = { 1433 .attr = { 1434 .name = "config", 1435 .mode = S_IRUGO | S_IWUSR, 1436 }, 1437 .size = PCI_CFG_SPACE_SIZE, 1438 .read = pci_read_config, 1439 .write = pci_write_config, 1440 }; 1441 1442 static const struct bin_attribute pcie_config_attr = { 1443 .attr = { 1444 .name = "config", 1445 .mode = S_IRUGO | S_IWUSR, 1446 }, 1447 .size = PCI_CFG_SPACE_EXP_SIZE, 1448 .read = pci_read_config, 1449 .write = pci_write_config, 1450 }; 1451 1452 static ssize_t reset_store(struct device *dev, struct device_attribute *attr, 1453 const char *buf, size_t count) 1454 { 1455 struct pci_dev *pdev = to_pci_dev(dev); 1456 unsigned long val; 1457 ssize_t result = kstrtoul(buf, 0, &val); 1458 1459 if (result < 0) 1460 return result; 1461 1462 if (val != 1) 1463 return -EINVAL; 1464 1465 pm_runtime_get_sync(dev); 1466 result = pci_reset_function(pdev); 1467 pm_runtime_put(dev); 1468 if (result < 0) 1469 return result; 1470 1471 return count; 1472 } 1473 1474 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store); 1475 1476 static int pci_create_capabilities_sysfs(struct pci_dev *dev) 1477 { 1478 int retval; 1479 1480 pcie_vpd_create_sysfs_dev_files(dev); 1481 pcie_aspm_create_sysfs_dev_files(dev); 1482 1483 if (dev->reset_fn) { 1484 retval = device_create_file(&dev->dev, &reset_attr); 1485 if (retval) 1486 goto error; 1487 } 1488 return 0; 1489 1490 error: 1491 pcie_aspm_remove_sysfs_dev_files(dev); 1492 pcie_vpd_remove_sysfs_dev_files(dev); 1493 return retval; 1494 } 1495 1496 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) 1497 { 1498 int retval; 1499 int rom_size; 1500 struct bin_attribute *attr; 1501 1502 if (!sysfs_initialized) 1503 return -EACCES; 1504 1505 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1506 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1507 else 1508 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); 1509 if (retval) 1510 goto err; 1511 1512 retval = pci_create_resource_files(pdev); 1513 if (retval) 1514 goto err_config_file; 1515 1516 /* If the device has a ROM, try to expose it in sysfs. */ 1517 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1518 if (rom_size) { 1519 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1520 if (!attr) { 1521 retval = -ENOMEM; 1522 goto err_resource_files; 1523 } 1524 sysfs_bin_attr_init(attr); 1525 attr->size = rom_size; 1526 attr->attr.name = "rom"; 1527 attr->attr.mode = S_IRUSR | S_IWUSR; 1528 attr->read = pci_read_rom; 1529 attr->write = pci_write_rom; 1530 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); 1531 if (retval) { 1532 kfree(attr); 1533 goto err_resource_files; 1534 } 1535 pdev->rom_attr = attr; 1536 } 1537 1538 /* add sysfs entries for various capabilities */ 1539 retval = pci_create_capabilities_sysfs(pdev); 1540 if (retval) 1541 goto err_rom_file; 1542 1543 pci_create_firmware_label_files(pdev); 1544 1545 return 0; 1546 1547 err_rom_file: 1548 if (pdev->rom_attr) { 1549 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1550 kfree(pdev->rom_attr); 1551 pdev->rom_attr = NULL; 1552 } 1553 err_resource_files: 1554 pci_remove_resource_files(pdev); 1555 err_config_file: 1556 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1557 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1558 else 1559 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1560 err: 1561 return retval; 1562 } 1563 1564 static void pci_remove_capabilities_sysfs(struct pci_dev *dev) 1565 { 1566 pcie_vpd_remove_sysfs_dev_files(dev); 1567 pcie_aspm_remove_sysfs_dev_files(dev); 1568 if (dev->reset_fn) { 1569 device_remove_file(&dev->dev, &reset_attr); 1570 dev->reset_fn = 0; 1571 } 1572 } 1573 1574 /** 1575 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files 1576 * @pdev: device whose entries we should free 1577 * 1578 * Cleanup when @pdev is removed from sysfs. 1579 */ 1580 void pci_remove_sysfs_dev_files(struct pci_dev *pdev) 1581 { 1582 if (!sysfs_initialized) 1583 return; 1584 1585 pci_remove_capabilities_sysfs(pdev); 1586 1587 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1588 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1589 else 1590 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1591 1592 pci_remove_resource_files(pdev); 1593 1594 if (pdev->rom_attr) { 1595 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1596 kfree(pdev->rom_attr); 1597 pdev->rom_attr = NULL; 1598 } 1599 1600 pci_remove_firmware_label_files(pdev); 1601 } 1602 1603 static int __init pci_sysfs_init(void) 1604 { 1605 struct pci_dev *pdev = NULL; 1606 int retval; 1607 1608 sysfs_initialized = 1; 1609 for_each_pci_dev(pdev) { 1610 retval = pci_create_sysfs_dev_files(pdev); 1611 if (retval) { 1612 pci_dev_put(pdev); 1613 return retval; 1614 } 1615 } 1616 1617 return 0; 1618 } 1619 late_initcall(pci_sysfs_init); 1620 1621 static struct attribute *pci_dev_dev_attrs[] = { 1622 &vga_attr.attr, 1623 NULL, 1624 }; 1625 1626 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj, 1627 struct attribute *a, int n) 1628 { 1629 struct device *dev = kobj_to_dev(kobj); 1630 struct pci_dev *pdev = to_pci_dev(dev); 1631 1632 if (a == &vga_attr.attr) 1633 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 1634 return 0; 1635 1636 return a->mode; 1637 } 1638 1639 static struct attribute *pci_dev_hp_attrs[] = { 1640 &dev_remove_attr.attr, 1641 &dev_rescan_attr.attr, 1642 NULL, 1643 }; 1644 1645 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj, 1646 struct attribute *a, int n) 1647 { 1648 struct device *dev = kobj_to_dev(kobj); 1649 struct pci_dev *pdev = to_pci_dev(dev); 1650 1651 if (pdev->is_virtfn) 1652 return 0; 1653 1654 return a->mode; 1655 } 1656 1657 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj, 1658 struct attribute *a, int n) 1659 { 1660 struct device *dev = kobj_to_dev(kobj); 1661 struct pci_dev *pdev = to_pci_dev(dev); 1662 1663 if (pci_is_bridge(pdev)) 1664 return a->mode; 1665 1666 return 0; 1667 } 1668 1669 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj, 1670 struct attribute *a, int n) 1671 { 1672 struct device *dev = kobj_to_dev(kobj); 1673 struct pci_dev *pdev = to_pci_dev(dev); 1674 1675 if (pci_is_pcie(pdev)) 1676 return a->mode; 1677 1678 return 0; 1679 } 1680 1681 static const struct attribute_group pci_dev_group = { 1682 .attrs = pci_dev_attrs, 1683 }; 1684 1685 const struct attribute_group *pci_dev_groups[] = { 1686 &pci_dev_group, 1687 NULL, 1688 }; 1689 1690 static const struct attribute_group pci_bridge_group = { 1691 .attrs = pci_bridge_attrs, 1692 }; 1693 1694 const struct attribute_group *pci_bridge_groups[] = { 1695 &pci_bridge_group, 1696 NULL, 1697 }; 1698 1699 static const struct attribute_group pcie_dev_group = { 1700 .attrs = pcie_dev_attrs, 1701 }; 1702 1703 const struct attribute_group *pcie_dev_groups[] = { 1704 &pcie_dev_group, 1705 NULL, 1706 }; 1707 1708 static const struct attribute_group pci_dev_hp_attr_group = { 1709 .attrs = pci_dev_hp_attrs, 1710 .is_visible = pci_dev_hp_attrs_are_visible, 1711 }; 1712 1713 #ifdef CONFIG_PCI_IOV 1714 static struct attribute *sriov_dev_attrs[] = { 1715 &sriov_totalvfs_attr.attr, 1716 &sriov_numvfs_attr.attr, 1717 &sriov_offset_attr.attr, 1718 &sriov_stride_attr.attr, 1719 &sriov_vf_device_attr.attr, 1720 &sriov_drivers_autoprobe_attr.attr, 1721 NULL, 1722 }; 1723 1724 static umode_t sriov_attrs_are_visible(struct kobject *kobj, 1725 struct attribute *a, int n) 1726 { 1727 struct device *dev = kobj_to_dev(kobj); 1728 1729 if (!dev_is_pf(dev)) 1730 return 0; 1731 1732 return a->mode; 1733 } 1734 1735 static const struct attribute_group sriov_dev_attr_group = { 1736 .attrs = sriov_dev_attrs, 1737 .is_visible = sriov_attrs_are_visible, 1738 }; 1739 #endif /* CONFIG_PCI_IOV */ 1740 1741 static const struct attribute_group pci_dev_attr_group = { 1742 .attrs = pci_dev_dev_attrs, 1743 .is_visible = pci_dev_attrs_are_visible, 1744 }; 1745 1746 static const struct attribute_group pci_bridge_attr_group = { 1747 .attrs = pci_bridge_attrs, 1748 .is_visible = pci_bridge_attrs_are_visible, 1749 }; 1750 1751 static const struct attribute_group pcie_dev_attr_group = { 1752 .attrs = pcie_dev_attrs, 1753 .is_visible = pcie_dev_attrs_are_visible, 1754 }; 1755 1756 static const struct attribute_group *pci_dev_attr_groups[] = { 1757 &pci_dev_attr_group, 1758 &pci_dev_hp_attr_group, 1759 #ifdef CONFIG_PCI_IOV 1760 &sriov_dev_attr_group, 1761 #endif 1762 &pci_bridge_attr_group, 1763 &pcie_dev_attr_group, 1764 #ifdef CONFIG_PCIEAER 1765 &aer_stats_attr_group, 1766 #endif 1767 NULL, 1768 }; 1769 1770 const struct device_type pci_dev_type = { 1771 .groups = pci_dev_attr_groups, 1772 }; 1773