1 /* 2 * drivers/pci/pci-sysfs.c 3 * 4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com> 5 * (C) Copyright 2002-2004 IBM Corp. 6 * (C) Copyright 2003 Matthew Wilcox 7 * (C) Copyright 2003 Hewlett-Packard 8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com> 9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com> 10 * 11 * File attributes for PCI devices 12 * 13 * Modeled after usb's driverfs.c 14 * 15 */ 16 17 18 #include <linux/kernel.h> 19 #include <linux/sched.h> 20 #include <linux/pci.h> 21 #include <linux/stat.h> 22 #include <linux/export.h> 23 #include <linux/topology.h> 24 #include <linux/mm.h> 25 #include <linux/fs.h> 26 #include <linux/capability.h> 27 #include <linux/security.h> 28 #include <linux/pci-aspm.h> 29 #include <linux/slab.h> 30 #include <linux/vgaarb.h> 31 #include <linux/pm_runtime.h> 32 #include <linux/of.h> 33 #include "pci.h" 34 35 static int sysfs_initialized; /* = 0 */ 36 37 /* show configuration fields */ 38 #define pci_config_attr(field, format_string) \ 39 static ssize_t \ 40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 41 { \ 42 struct pci_dev *pdev; \ 43 \ 44 pdev = to_pci_dev(dev); \ 45 return sprintf(buf, format_string, pdev->field); \ 46 } \ 47 static DEVICE_ATTR_RO(field) 48 49 pci_config_attr(vendor, "0x%04x\n"); 50 pci_config_attr(device, "0x%04x\n"); 51 pci_config_attr(subsystem_vendor, "0x%04x\n"); 52 pci_config_attr(subsystem_device, "0x%04x\n"); 53 pci_config_attr(class, "0x%06x\n"); 54 pci_config_attr(irq, "%u\n"); 55 56 static ssize_t broken_parity_status_show(struct device *dev, 57 struct device_attribute *attr, 58 char *buf) 59 { 60 struct pci_dev *pdev = to_pci_dev(dev); 61 return sprintf(buf, "%u\n", pdev->broken_parity_status); 62 } 63 64 static ssize_t broken_parity_status_store(struct device *dev, 65 struct device_attribute *attr, 66 const char *buf, size_t count) 67 { 68 struct pci_dev *pdev = to_pci_dev(dev); 69 unsigned long val; 70 71 if (kstrtoul(buf, 0, &val) < 0) 72 return -EINVAL; 73 74 pdev->broken_parity_status = !!val; 75 76 return count; 77 } 78 static DEVICE_ATTR_RW(broken_parity_status); 79 80 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list, 81 struct device_attribute *attr, char *buf) 82 { 83 const struct cpumask *mask; 84 85 #ifdef CONFIG_NUMA 86 mask = (dev_to_node(dev) == -1) ? cpu_online_mask : 87 cpumask_of_node(dev_to_node(dev)); 88 #else 89 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus); 90 #endif 91 return cpumap_print_to_pagebuf(list, buf, mask); 92 } 93 94 static ssize_t local_cpus_show(struct device *dev, 95 struct device_attribute *attr, char *buf) 96 { 97 return pci_dev_show_local_cpu(dev, false, attr, buf); 98 } 99 static DEVICE_ATTR_RO(local_cpus); 100 101 static ssize_t local_cpulist_show(struct device *dev, 102 struct device_attribute *attr, char *buf) 103 { 104 return pci_dev_show_local_cpu(dev, true, attr, buf); 105 } 106 static DEVICE_ATTR_RO(local_cpulist); 107 108 /* 109 * PCI Bus Class Devices 110 */ 111 static ssize_t cpuaffinity_show(struct device *dev, 112 struct device_attribute *attr, char *buf) 113 { 114 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev)); 115 116 return cpumap_print_to_pagebuf(false, buf, cpumask); 117 } 118 static DEVICE_ATTR_RO(cpuaffinity); 119 120 static ssize_t cpulistaffinity_show(struct device *dev, 121 struct device_attribute *attr, char *buf) 122 { 123 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev)); 124 125 return cpumap_print_to_pagebuf(true, buf, cpumask); 126 } 127 static DEVICE_ATTR_RO(cpulistaffinity); 128 129 /* show resources */ 130 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, 131 char *buf) 132 { 133 struct pci_dev *pci_dev = to_pci_dev(dev); 134 char *str = buf; 135 int i; 136 int max; 137 resource_size_t start, end; 138 139 if (pci_dev->subordinate) 140 max = DEVICE_COUNT_RESOURCE; 141 else 142 max = PCI_BRIDGE_RESOURCES; 143 144 for (i = 0; i < max; i++) { 145 struct resource *res = &pci_dev->resource[i]; 146 pci_resource_to_user(pci_dev, i, res, &start, &end); 147 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n", 148 (unsigned long long)start, 149 (unsigned long long)end, 150 (unsigned long long)res->flags); 151 } 152 return (str - buf); 153 } 154 static DEVICE_ATTR_RO(resource); 155 156 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 157 char *buf) 158 { 159 struct pci_dev *pci_dev = to_pci_dev(dev); 160 161 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n", 162 pci_dev->vendor, pci_dev->device, 163 pci_dev->subsystem_vendor, pci_dev->subsystem_device, 164 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), 165 (u8)(pci_dev->class)); 166 } 167 static DEVICE_ATTR_RO(modalias); 168 169 static ssize_t enable_store(struct device *dev, struct device_attribute *attr, 170 const char *buf, size_t count) 171 { 172 struct pci_dev *pdev = to_pci_dev(dev); 173 unsigned long val; 174 ssize_t result = kstrtoul(buf, 0, &val); 175 176 if (result < 0) 177 return result; 178 179 /* this can crash the machine when done on the "wrong" device */ 180 if (!capable(CAP_SYS_ADMIN)) 181 return -EPERM; 182 183 if (!val) { 184 if (pci_is_enabled(pdev)) 185 pci_disable_device(pdev); 186 else 187 result = -EIO; 188 } else 189 result = pci_enable_device(pdev); 190 191 return result < 0 ? result : count; 192 } 193 194 static ssize_t enable_show(struct device *dev, struct device_attribute *attr, 195 char *buf) 196 { 197 struct pci_dev *pdev; 198 199 pdev = to_pci_dev(dev); 200 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt)); 201 } 202 static DEVICE_ATTR_RW(enable); 203 204 #ifdef CONFIG_NUMA 205 static ssize_t numa_node_store(struct device *dev, 206 struct device_attribute *attr, const char *buf, 207 size_t count) 208 { 209 struct pci_dev *pdev = to_pci_dev(dev); 210 int node, ret; 211 212 if (!capable(CAP_SYS_ADMIN)) 213 return -EPERM; 214 215 ret = kstrtoint(buf, 0, &node); 216 if (ret) 217 return ret; 218 219 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES) 220 return -EINVAL; 221 222 if (node != NUMA_NO_NODE && !node_online(node)) 223 return -EINVAL; 224 225 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); 226 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.", 227 node); 228 229 dev->numa_node = node; 230 return count; 231 } 232 233 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, 234 char *buf) 235 { 236 return sprintf(buf, "%d\n", dev->numa_node); 237 } 238 static DEVICE_ATTR_RW(numa_node); 239 #endif 240 241 static ssize_t dma_mask_bits_show(struct device *dev, 242 struct device_attribute *attr, char *buf) 243 { 244 struct pci_dev *pdev = to_pci_dev(dev); 245 246 return sprintf(buf, "%d\n", fls64(pdev->dma_mask)); 247 } 248 static DEVICE_ATTR_RO(dma_mask_bits); 249 250 static ssize_t consistent_dma_mask_bits_show(struct device *dev, 251 struct device_attribute *attr, 252 char *buf) 253 { 254 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask)); 255 } 256 static DEVICE_ATTR_RO(consistent_dma_mask_bits); 257 258 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr, 259 char *buf) 260 { 261 struct pci_dev *pdev = to_pci_dev(dev); 262 struct pci_bus *subordinate = pdev->subordinate; 263 264 return sprintf(buf, "%u\n", subordinate ? 265 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) 266 : !pdev->no_msi); 267 } 268 269 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr, 270 const char *buf, size_t count) 271 { 272 struct pci_dev *pdev = to_pci_dev(dev); 273 struct pci_bus *subordinate = pdev->subordinate; 274 unsigned long val; 275 276 if (kstrtoul(buf, 0, &val) < 0) 277 return -EINVAL; 278 279 if (!capable(CAP_SYS_ADMIN)) 280 return -EPERM; 281 282 /* 283 * "no_msi" and "bus_flags" only affect what happens when a driver 284 * requests MSI or MSI-X. They don't affect any drivers that have 285 * already requested MSI or MSI-X. 286 */ 287 if (!subordinate) { 288 pdev->no_msi = !val; 289 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n", 290 val ? "allowed" : "disallowed"); 291 return count; 292 } 293 294 if (val) 295 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; 296 else 297 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; 298 299 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n", 300 val ? "allowed" : "disallowed"); 301 return count; 302 } 303 static DEVICE_ATTR_RW(msi_bus); 304 305 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, 306 size_t count) 307 { 308 unsigned long val; 309 struct pci_bus *b = NULL; 310 311 if (kstrtoul(buf, 0, &val) < 0) 312 return -EINVAL; 313 314 if (val) { 315 pci_lock_rescan_remove(); 316 while ((b = pci_find_next_bus(b)) != NULL) 317 pci_rescan_bus(b); 318 pci_unlock_rescan_remove(); 319 } 320 return count; 321 } 322 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store); 323 324 static struct attribute *pci_bus_attrs[] = { 325 &bus_attr_rescan.attr, 326 NULL, 327 }; 328 329 static const struct attribute_group pci_bus_group = { 330 .attrs = pci_bus_attrs, 331 }; 332 333 const struct attribute_group *pci_bus_groups[] = { 334 &pci_bus_group, 335 NULL, 336 }; 337 338 static ssize_t dev_rescan_store(struct device *dev, 339 struct device_attribute *attr, const char *buf, 340 size_t count) 341 { 342 unsigned long val; 343 struct pci_dev *pdev = to_pci_dev(dev); 344 345 if (kstrtoul(buf, 0, &val) < 0) 346 return -EINVAL; 347 348 if (val) { 349 pci_lock_rescan_remove(); 350 pci_rescan_bus(pdev->bus); 351 pci_unlock_rescan_remove(); 352 } 353 return count; 354 } 355 static struct device_attribute dev_rescan_attr = __ATTR(rescan, 356 (S_IWUSR|S_IWGRP), 357 NULL, dev_rescan_store); 358 359 static ssize_t remove_store(struct device *dev, struct device_attribute *attr, 360 const char *buf, size_t count) 361 { 362 unsigned long val; 363 364 if (kstrtoul(buf, 0, &val) < 0) 365 return -EINVAL; 366 367 if (val && device_remove_file_self(dev, attr)) 368 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); 369 return count; 370 } 371 static struct device_attribute dev_remove_attr = __ATTR(remove, 372 (S_IWUSR|S_IWGRP), 373 NULL, remove_store); 374 375 static ssize_t dev_bus_rescan_store(struct device *dev, 376 struct device_attribute *attr, 377 const char *buf, size_t count) 378 { 379 unsigned long val; 380 struct pci_bus *bus = to_pci_bus(dev); 381 382 if (kstrtoul(buf, 0, &val) < 0) 383 return -EINVAL; 384 385 if (val) { 386 pci_lock_rescan_remove(); 387 if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) 388 pci_rescan_bus_bridge_resize(bus->self); 389 else 390 pci_rescan_bus(bus); 391 pci_unlock_rescan_remove(); 392 } 393 return count; 394 } 395 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store); 396 397 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 398 static ssize_t d3cold_allowed_store(struct device *dev, 399 struct device_attribute *attr, 400 const char *buf, size_t count) 401 { 402 struct pci_dev *pdev = to_pci_dev(dev); 403 unsigned long val; 404 405 if (kstrtoul(buf, 0, &val) < 0) 406 return -EINVAL; 407 408 pdev->d3cold_allowed = !!val; 409 if (pdev->d3cold_allowed) 410 pci_d3cold_enable(pdev); 411 else 412 pci_d3cold_disable(pdev); 413 414 pm_runtime_resume(dev); 415 416 return count; 417 } 418 419 static ssize_t d3cold_allowed_show(struct device *dev, 420 struct device_attribute *attr, char *buf) 421 { 422 struct pci_dev *pdev = to_pci_dev(dev); 423 return sprintf(buf, "%u\n", pdev->d3cold_allowed); 424 } 425 static DEVICE_ATTR_RW(d3cold_allowed); 426 #endif 427 428 #ifdef CONFIG_OF 429 static ssize_t devspec_show(struct device *dev, 430 struct device_attribute *attr, char *buf) 431 { 432 struct pci_dev *pdev = to_pci_dev(dev); 433 struct device_node *np = pci_device_to_OF_node(pdev); 434 435 if (np == NULL || np->full_name == NULL) 436 return 0; 437 return sprintf(buf, "%s", np->full_name); 438 } 439 static DEVICE_ATTR_RO(devspec); 440 #endif 441 442 #ifdef CONFIG_PCI_IOV 443 static ssize_t sriov_totalvfs_show(struct device *dev, 444 struct device_attribute *attr, 445 char *buf) 446 { 447 struct pci_dev *pdev = to_pci_dev(dev); 448 449 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev)); 450 } 451 452 453 static ssize_t sriov_numvfs_show(struct device *dev, 454 struct device_attribute *attr, 455 char *buf) 456 { 457 struct pci_dev *pdev = to_pci_dev(dev); 458 459 return sprintf(buf, "%u\n", pdev->sriov->num_VFs); 460 } 461 462 /* 463 * num_vfs > 0; number of VFs to enable 464 * num_vfs = 0; disable all VFs 465 * 466 * Note: SRIOV spec doesn't allow partial VF 467 * disable, so it's all or none. 468 */ 469 static ssize_t sriov_numvfs_store(struct device *dev, 470 struct device_attribute *attr, 471 const char *buf, size_t count) 472 { 473 struct pci_dev *pdev = to_pci_dev(dev); 474 int ret; 475 u16 num_vfs; 476 477 ret = kstrtou16(buf, 0, &num_vfs); 478 if (ret < 0) 479 return ret; 480 481 if (num_vfs > pci_sriov_get_totalvfs(pdev)) 482 return -ERANGE; 483 484 if (num_vfs == pdev->sriov->num_VFs) 485 return count; /* no change */ 486 487 /* is PF driver loaded w/callback */ 488 if (!pdev->driver || !pdev->driver->sriov_configure) { 489 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n"); 490 return -ENOSYS; 491 } 492 493 if (num_vfs == 0) { 494 /* disable VFs */ 495 ret = pdev->driver->sriov_configure(pdev, 0); 496 if (ret < 0) 497 return ret; 498 return count; 499 } 500 501 /* enable VFs */ 502 if (pdev->sriov->num_VFs) { 503 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n", 504 pdev->sriov->num_VFs, num_vfs); 505 return -EBUSY; 506 } 507 508 ret = pdev->driver->sriov_configure(pdev, num_vfs); 509 if (ret < 0) 510 return ret; 511 512 if (ret != num_vfs) 513 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n", 514 num_vfs, ret); 515 516 return count; 517 } 518 519 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs); 520 static struct device_attribute sriov_numvfs_attr = 521 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP), 522 sriov_numvfs_show, sriov_numvfs_store); 523 #endif /* CONFIG_PCI_IOV */ 524 525 static ssize_t driver_override_store(struct device *dev, 526 struct device_attribute *attr, 527 const char *buf, size_t count) 528 { 529 struct pci_dev *pdev = to_pci_dev(dev); 530 char *driver_override, *old = pdev->driver_override, *cp; 531 532 /* We need to keep extra room for a newline */ 533 if (count >= (PAGE_SIZE - 1)) 534 return -EINVAL; 535 536 driver_override = kstrndup(buf, count, GFP_KERNEL); 537 if (!driver_override) 538 return -ENOMEM; 539 540 cp = strchr(driver_override, '\n'); 541 if (cp) 542 *cp = '\0'; 543 544 if (strlen(driver_override)) { 545 pdev->driver_override = driver_override; 546 } else { 547 kfree(driver_override); 548 pdev->driver_override = NULL; 549 } 550 551 kfree(old); 552 553 return count; 554 } 555 556 static ssize_t driver_override_show(struct device *dev, 557 struct device_attribute *attr, char *buf) 558 { 559 struct pci_dev *pdev = to_pci_dev(dev); 560 561 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override); 562 } 563 static DEVICE_ATTR_RW(driver_override); 564 565 static struct attribute *pci_dev_attrs[] = { 566 &dev_attr_resource.attr, 567 &dev_attr_vendor.attr, 568 &dev_attr_device.attr, 569 &dev_attr_subsystem_vendor.attr, 570 &dev_attr_subsystem_device.attr, 571 &dev_attr_class.attr, 572 &dev_attr_irq.attr, 573 &dev_attr_local_cpus.attr, 574 &dev_attr_local_cpulist.attr, 575 &dev_attr_modalias.attr, 576 #ifdef CONFIG_NUMA 577 &dev_attr_numa_node.attr, 578 #endif 579 &dev_attr_dma_mask_bits.attr, 580 &dev_attr_consistent_dma_mask_bits.attr, 581 &dev_attr_enable.attr, 582 &dev_attr_broken_parity_status.attr, 583 &dev_attr_msi_bus.attr, 584 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 585 &dev_attr_d3cold_allowed.attr, 586 #endif 587 #ifdef CONFIG_OF 588 &dev_attr_devspec.attr, 589 #endif 590 &dev_attr_driver_override.attr, 591 NULL, 592 }; 593 594 static const struct attribute_group pci_dev_group = { 595 .attrs = pci_dev_attrs, 596 }; 597 598 const struct attribute_group *pci_dev_groups[] = { 599 &pci_dev_group, 600 NULL, 601 }; 602 603 static struct attribute *pcibus_attrs[] = { 604 &dev_attr_rescan.attr, 605 &dev_attr_cpuaffinity.attr, 606 &dev_attr_cpulistaffinity.attr, 607 NULL, 608 }; 609 610 static const struct attribute_group pcibus_group = { 611 .attrs = pcibus_attrs, 612 }; 613 614 const struct attribute_group *pcibus_groups[] = { 615 &pcibus_group, 616 NULL, 617 }; 618 619 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, 620 char *buf) 621 { 622 struct pci_dev *pdev = to_pci_dev(dev); 623 struct pci_dev *vga_dev = vga_default_device(); 624 625 if (vga_dev) 626 return sprintf(buf, "%u\n", (pdev == vga_dev)); 627 628 return sprintf(buf, "%u\n", 629 !!(pdev->resource[PCI_ROM_RESOURCE].flags & 630 IORESOURCE_ROM_SHADOW)); 631 } 632 static struct device_attribute vga_attr = __ATTR_RO(boot_vga); 633 634 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, 635 struct bin_attribute *bin_attr, char *buf, 636 loff_t off, size_t count) 637 { 638 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 639 unsigned int size = 64; 640 loff_t init_off = off; 641 u8 *data = (u8 *) buf; 642 643 /* Several chips lock up trying to read undefined config space */ 644 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN)) 645 size = dev->cfg_size; 646 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 647 size = 128; 648 649 if (off > size) 650 return 0; 651 if (off + count > size) { 652 size -= off; 653 count = size; 654 } else { 655 size = count; 656 } 657 658 pci_config_pm_runtime_get(dev); 659 660 if ((off & 1) && size) { 661 u8 val; 662 pci_user_read_config_byte(dev, off, &val); 663 data[off - init_off] = val; 664 off++; 665 size--; 666 } 667 668 if ((off & 3) && size > 2) { 669 u16 val; 670 pci_user_read_config_word(dev, off, &val); 671 data[off - init_off] = val & 0xff; 672 data[off - init_off + 1] = (val >> 8) & 0xff; 673 off += 2; 674 size -= 2; 675 } 676 677 while (size > 3) { 678 u32 val; 679 pci_user_read_config_dword(dev, off, &val); 680 data[off - init_off] = val & 0xff; 681 data[off - init_off + 1] = (val >> 8) & 0xff; 682 data[off - init_off + 2] = (val >> 16) & 0xff; 683 data[off - init_off + 3] = (val >> 24) & 0xff; 684 off += 4; 685 size -= 4; 686 } 687 688 if (size >= 2) { 689 u16 val; 690 pci_user_read_config_word(dev, off, &val); 691 data[off - init_off] = val & 0xff; 692 data[off - init_off + 1] = (val >> 8) & 0xff; 693 off += 2; 694 size -= 2; 695 } 696 697 if (size > 0) { 698 u8 val; 699 pci_user_read_config_byte(dev, off, &val); 700 data[off - init_off] = val; 701 off++; 702 --size; 703 } 704 705 pci_config_pm_runtime_put(dev); 706 707 return count; 708 } 709 710 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, 711 struct bin_attribute *bin_attr, char *buf, 712 loff_t off, size_t count) 713 { 714 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 715 unsigned int size = count; 716 loff_t init_off = off; 717 u8 *data = (u8 *) buf; 718 719 if (off > dev->cfg_size) 720 return 0; 721 if (off + count > dev->cfg_size) { 722 size = dev->cfg_size - off; 723 count = size; 724 } 725 726 pci_config_pm_runtime_get(dev); 727 728 if ((off & 1) && size) { 729 pci_user_write_config_byte(dev, off, data[off - init_off]); 730 off++; 731 size--; 732 } 733 734 if ((off & 3) && size > 2) { 735 u16 val = data[off - init_off]; 736 val |= (u16) data[off - init_off + 1] << 8; 737 pci_user_write_config_word(dev, off, val); 738 off += 2; 739 size -= 2; 740 } 741 742 while (size > 3) { 743 u32 val = data[off - init_off]; 744 val |= (u32) data[off - init_off + 1] << 8; 745 val |= (u32) data[off - init_off + 2] << 16; 746 val |= (u32) data[off - init_off + 3] << 24; 747 pci_user_write_config_dword(dev, off, val); 748 off += 4; 749 size -= 4; 750 } 751 752 if (size >= 2) { 753 u16 val = data[off - init_off]; 754 val |= (u16) data[off - init_off + 1] << 8; 755 pci_user_write_config_word(dev, off, val); 756 off += 2; 757 size -= 2; 758 } 759 760 if (size) { 761 pci_user_write_config_byte(dev, off, data[off - init_off]); 762 off++; 763 --size; 764 } 765 766 pci_config_pm_runtime_put(dev); 767 768 return count; 769 } 770 771 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj, 772 struct bin_attribute *bin_attr, char *buf, 773 loff_t off, size_t count) 774 { 775 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 776 777 if (bin_attr->size > 0) { 778 if (off > bin_attr->size) 779 count = 0; 780 else if (count > bin_attr->size - off) 781 count = bin_attr->size - off; 782 } 783 784 return pci_read_vpd(dev, off, count, buf); 785 } 786 787 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj, 788 struct bin_attribute *bin_attr, char *buf, 789 loff_t off, size_t count) 790 { 791 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); 792 793 if (bin_attr->size > 0) { 794 if (off > bin_attr->size) 795 count = 0; 796 else if (count > bin_attr->size - off) 797 count = bin_attr->size - off; 798 } 799 800 return pci_write_vpd(dev, off, count, buf); 801 } 802 803 #ifdef HAVE_PCI_LEGACY 804 /** 805 * pci_read_legacy_io - read byte(s) from legacy I/O port space 806 * @filp: open sysfs file 807 * @kobj: kobject corresponding to file to read from 808 * @bin_attr: struct bin_attribute for this file 809 * @buf: buffer to store results 810 * @off: offset into legacy I/O port space 811 * @count: number of bytes to read 812 * 813 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific 814 * callback routine (pci_legacy_read). 815 */ 816 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, 817 struct bin_attribute *bin_attr, char *buf, 818 loff_t off, size_t count) 819 { 820 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 821 822 /* Only support 1, 2 or 4 byte accesses */ 823 if (count != 1 && count != 2 && count != 4) 824 return -EINVAL; 825 826 return pci_legacy_read(bus, off, (u32 *)buf, count); 827 } 828 829 /** 830 * pci_write_legacy_io - write byte(s) to legacy I/O port space 831 * @filp: open sysfs file 832 * @kobj: kobject corresponding to file to read from 833 * @bin_attr: struct bin_attribute for this file 834 * @buf: buffer containing value to be written 835 * @off: offset into legacy I/O port space 836 * @count: number of bytes to write 837 * 838 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific 839 * callback routine (pci_legacy_write). 840 */ 841 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj, 842 struct bin_attribute *bin_attr, char *buf, 843 loff_t off, size_t count) 844 { 845 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 846 847 /* Only support 1, 2 or 4 byte accesses */ 848 if (count != 1 && count != 2 && count != 4) 849 return -EINVAL; 850 851 return pci_legacy_write(bus, off, *(u32 *)buf, count); 852 } 853 854 /** 855 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space 856 * @filp: open sysfs file 857 * @kobj: kobject corresponding to device to be mapped 858 * @attr: struct bin_attribute for this file 859 * @vma: struct vm_area_struct passed to mmap 860 * 861 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap 862 * legacy memory space (first meg of bus space) into application virtual 863 * memory space. 864 */ 865 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj, 866 struct bin_attribute *attr, 867 struct vm_area_struct *vma) 868 { 869 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 870 871 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem); 872 } 873 874 /** 875 * pci_mmap_legacy_io - map legacy PCI IO into user memory space 876 * @filp: open sysfs file 877 * @kobj: kobject corresponding to device to be mapped 878 * @attr: struct bin_attribute for this file 879 * @vma: struct vm_area_struct passed to mmap 880 * 881 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap 882 * legacy IO space (first meg of bus space) into application virtual 883 * memory space. Returns -ENOSYS if the operation isn't supported 884 */ 885 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj, 886 struct bin_attribute *attr, 887 struct vm_area_struct *vma) 888 { 889 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); 890 891 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); 892 } 893 894 /** 895 * pci_adjust_legacy_attr - adjustment of legacy file attributes 896 * @b: bus to create files under 897 * @mmap_type: I/O port or memory 898 * 899 * Stub implementation. Can be overridden by arch if necessary. 900 */ 901 void __weak pci_adjust_legacy_attr(struct pci_bus *b, 902 enum pci_mmap_state mmap_type) 903 { 904 } 905 906 /** 907 * pci_create_legacy_files - create legacy I/O port and memory files 908 * @b: bus to create files under 909 * 910 * Some platforms allow access to legacy I/O port and ISA memory space on 911 * a per-bus basis. This routine creates the files and ties them into 912 * their associated read, write and mmap files from pci-sysfs.c 913 * 914 * On error unwind, but don't propagate the error to the caller 915 * as it is ok to set up the PCI bus without these files. 916 */ 917 void pci_create_legacy_files(struct pci_bus *b) 918 { 919 int error; 920 921 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, 922 GFP_ATOMIC); 923 if (!b->legacy_io) 924 goto kzalloc_err; 925 926 sysfs_bin_attr_init(b->legacy_io); 927 b->legacy_io->attr.name = "legacy_io"; 928 b->legacy_io->size = 0xffff; 929 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; 930 b->legacy_io->read = pci_read_legacy_io; 931 b->legacy_io->write = pci_write_legacy_io; 932 b->legacy_io->mmap = pci_mmap_legacy_io; 933 pci_adjust_legacy_attr(b, pci_mmap_io); 934 error = device_create_bin_file(&b->dev, b->legacy_io); 935 if (error) 936 goto legacy_io_err; 937 938 /* Allocated above after the legacy_io struct */ 939 b->legacy_mem = b->legacy_io + 1; 940 sysfs_bin_attr_init(b->legacy_mem); 941 b->legacy_mem->attr.name = "legacy_mem"; 942 b->legacy_mem->size = 1024*1024; 943 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; 944 b->legacy_mem->mmap = pci_mmap_legacy_mem; 945 pci_adjust_legacy_attr(b, pci_mmap_mem); 946 error = device_create_bin_file(&b->dev, b->legacy_mem); 947 if (error) 948 goto legacy_mem_err; 949 950 return; 951 952 legacy_mem_err: 953 device_remove_bin_file(&b->dev, b->legacy_io); 954 legacy_io_err: 955 kfree(b->legacy_io); 956 b->legacy_io = NULL; 957 kzalloc_err: 958 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n"); 959 return; 960 } 961 962 void pci_remove_legacy_files(struct pci_bus *b) 963 { 964 if (b->legacy_io) { 965 device_remove_bin_file(&b->dev, b->legacy_io); 966 device_remove_bin_file(&b->dev, b->legacy_mem); 967 kfree(b->legacy_io); /* both are allocated here */ 968 } 969 } 970 #endif /* HAVE_PCI_LEGACY */ 971 972 #ifdef HAVE_PCI_MMAP 973 974 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, 975 enum pci_mmap_api mmap_api) 976 { 977 unsigned long nr, start, size, pci_start; 978 979 if (pci_resource_len(pdev, resno) == 0) 980 return 0; 981 nr = vma_pages(vma); 982 start = vma->vm_pgoff; 983 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; 984 pci_start = (mmap_api == PCI_MMAP_PROCFS) ? 985 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0; 986 if (start >= pci_start && start < pci_start + size && 987 start + nr <= pci_start + size) 988 return 1; 989 return 0; 990 } 991 992 /** 993 * pci_mmap_resource - map a PCI resource into user memory space 994 * @kobj: kobject for mapping 995 * @attr: struct bin_attribute for the file being mapped 996 * @vma: struct vm_area_struct passed into the mmap 997 * @write_combine: 1 for write_combine mapping 998 * 999 * Use the regular PCI mapping routines to map a PCI resource into userspace. 1000 */ 1001 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, 1002 struct vm_area_struct *vma, int write_combine) 1003 { 1004 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1005 struct resource *res = attr->private; 1006 enum pci_mmap_state mmap_type; 1007 resource_size_t start, end; 1008 int i; 1009 1010 for (i = 0; i < PCI_ROM_RESOURCE; i++) 1011 if (res == &pdev->resource[i]) 1012 break; 1013 if (i >= PCI_ROM_RESOURCE) 1014 return -ENODEV; 1015 1016 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start)) 1017 return -EINVAL; 1018 1019 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) { 1020 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n", 1021 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff, 1022 pci_name(pdev), i, 1023 (u64)pci_resource_start(pdev, i), 1024 (u64)pci_resource_len(pdev, i)); 1025 return -EINVAL; 1026 } 1027 1028 /* pci_mmap_page_range() expects the same kind of entry as coming 1029 * from /proc/bus/pci/ which is a "user visible" value. If this is 1030 * different from the resource itself, arch will do necessary fixup. 1031 */ 1032 pci_resource_to_user(pdev, i, res, &start, &end); 1033 vma->vm_pgoff += start >> PAGE_SHIFT; 1034 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; 1035 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine); 1036 } 1037 1038 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj, 1039 struct bin_attribute *attr, 1040 struct vm_area_struct *vma) 1041 { 1042 return pci_mmap_resource(kobj, attr, vma, 0); 1043 } 1044 1045 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj, 1046 struct bin_attribute *attr, 1047 struct vm_area_struct *vma) 1048 { 1049 return pci_mmap_resource(kobj, attr, vma, 1); 1050 } 1051 1052 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, 1053 struct bin_attribute *attr, char *buf, 1054 loff_t off, size_t count, bool write) 1055 { 1056 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1057 struct resource *res = attr->private; 1058 unsigned long port = off; 1059 int i; 1060 1061 for (i = 0; i < PCI_ROM_RESOURCE; i++) 1062 if (res == &pdev->resource[i]) 1063 break; 1064 if (i >= PCI_ROM_RESOURCE) 1065 return -ENODEV; 1066 1067 port += pci_resource_start(pdev, i); 1068 1069 if (port > pci_resource_end(pdev, i)) 1070 return 0; 1071 1072 if (port + count - 1 > pci_resource_end(pdev, i)) 1073 return -EINVAL; 1074 1075 switch (count) { 1076 case 1: 1077 if (write) 1078 outb(*(u8 *)buf, port); 1079 else 1080 *(u8 *)buf = inb(port); 1081 return 1; 1082 case 2: 1083 if (write) 1084 outw(*(u16 *)buf, port); 1085 else 1086 *(u16 *)buf = inw(port); 1087 return 2; 1088 case 4: 1089 if (write) 1090 outl(*(u32 *)buf, port); 1091 else 1092 *(u32 *)buf = inl(port); 1093 return 4; 1094 } 1095 return -EINVAL; 1096 } 1097 1098 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj, 1099 struct bin_attribute *attr, char *buf, 1100 loff_t off, size_t count) 1101 { 1102 return pci_resource_io(filp, kobj, attr, buf, off, count, false); 1103 } 1104 1105 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, 1106 struct bin_attribute *attr, char *buf, 1107 loff_t off, size_t count) 1108 { 1109 return pci_resource_io(filp, kobj, attr, buf, off, count, true); 1110 } 1111 1112 /** 1113 * pci_remove_resource_files - cleanup resource files 1114 * @pdev: dev to cleanup 1115 * 1116 * If we created resource files for @pdev, remove them from sysfs and 1117 * free their resources. 1118 */ 1119 static void pci_remove_resource_files(struct pci_dev *pdev) 1120 { 1121 int i; 1122 1123 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1124 struct bin_attribute *res_attr; 1125 1126 res_attr = pdev->res_attr[i]; 1127 if (res_attr) { 1128 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1129 kfree(res_attr); 1130 } 1131 1132 res_attr = pdev->res_attr_wc[i]; 1133 if (res_attr) { 1134 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1135 kfree(res_attr); 1136 } 1137 } 1138 } 1139 1140 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) 1141 { 1142 /* allocate attribute structure, piggyback attribute name */ 1143 int name_len = write_combine ? 13 : 10; 1144 struct bin_attribute *res_attr; 1145 char *res_attr_name; 1146 int retval; 1147 1148 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); 1149 if (!res_attr) 1150 return -ENOMEM; 1151 1152 res_attr_name = (char *)(res_attr + 1); 1153 1154 sysfs_bin_attr_init(res_attr); 1155 if (write_combine) { 1156 pdev->res_attr_wc[num] = res_attr; 1157 sprintf(res_attr_name, "resource%d_wc", num); 1158 res_attr->mmap = pci_mmap_resource_wc; 1159 } else { 1160 pdev->res_attr[num] = res_attr; 1161 sprintf(res_attr_name, "resource%d", num); 1162 res_attr->mmap = pci_mmap_resource_uc; 1163 } 1164 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { 1165 res_attr->read = pci_read_resource_io; 1166 res_attr->write = pci_write_resource_io; 1167 } 1168 res_attr->attr.name = res_attr_name; 1169 res_attr->attr.mode = S_IRUSR | S_IWUSR; 1170 res_attr->size = pci_resource_len(pdev, num); 1171 res_attr->private = &pdev->resource[num]; 1172 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); 1173 if (retval) 1174 kfree(res_attr); 1175 1176 return retval; 1177 } 1178 1179 /** 1180 * pci_create_resource_files - create resource files in sysfs for @dev 1181 * @pdev: dev in question 1182 * 1183 * Walk the resources in @pdev creating files for each resource available. 1184 */ 1185 static int pci_create_resource_files(struct pci_dev *pdev) 1186 { 1187 int i; 1188 int retval; 1189 1190 /* Expose the PCI resources from this device as files */ 1191 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1192 1193 /* skip empty resources */ 1194 if (!pci_resource_len(pdev, i)) 1195 continue; 1196 1197 retval = pci_create_attr(pdev, i, 0); 1198 /* for prefetchable resources, create a WC mappable file */ 1199 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) 1200 retval = pci_create_attr(pdev, i, 1); 1201 1202 if (retval) { 1203 pci_remove_resource_files(pdev); 1204 return retval; 1205 } 1206 } 1207 return 0; 1208 } 1209 #else /* !HAVE_PCI_MMAP */ 1210 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } 1211 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } 1212 #endif /* HAVE_PCI_MMAP */ 1213 1214 /** 1215 * pci_write_rom - used to enable access to the PCI ROM display 1216 * @filp: sysfs file 1217 * @kobj: kernel object handle 1218 * @bin_attr: struct bin_attribute for this file 1219 * @buf: user input 1220 * @off: file offset 1221 * @count: number of byte in input 1222 * 1223 * writing anything except 0 enables it 1224 */ 1225 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, 1226 struct bin_attribute *bin_attr, char *buf, 1227 loff_t off, size_t count) 1228 { 1229 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1230 1231 if ((off == 0) && (*buf == '0') && (count == 2)) 1232 pdev->rom_attr_enabled = 0; 1233 else 1234 pdev->rom_attr_enabled = 1; 1235 1236 return count; 1237 } 1238 1239 /** 1240 * pci_read_rom - read a PCI ROM 1241 * @filp: sysfs file 1242 * @kobj: kernel object handle 1243 * @bin_attr: struct bin_attribute for this file 1244 * @buf: where to put the data we read from the ROM 1245 * @off: file offset 1246 * @count: number of bytes to read 1247 * 1248 * Put @count bytes starting at @off into @buf from the ROM in the PCI 1249 * device corresponding to @kobj. 1250 */ 1251 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, 1252 struct bin_attribute *bin_attr, char *buf, 1253 loff_t off, size_t count) 1254 { 1255 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 1256 void __iomem *rom; 1257 size_t size; 1258 1259 if (!pdev->rom_attr_enabled) 1260 return -EINVAL; 1261 1262 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ 1263 if (!rom || !size) 1264 return -EIO; 1265 1266 if (off >= size) 1267 count = 0; 1268 else { 1269 if (off + count > size) 1270 count = size - off; 1271 1272 memcpy_fromio(buf, rom + off, count); 1273 } 1274 pci_unmap_rom(pdev, rom); 1275 1276 return count; 1277 } 1278 1279 static struct bin_attribute pci_config_attr = { 1280 .attr = { 1281 .name = "config", 1282 .mode = S_IRUGO | S_IWUSR, 1283 }, 1284 .size = PCI_CFG_SPACE_SIZE, 1285 .read = pci_read_config, 1286 .write = pci_write_config, 1287 }; 1288 1289 static struct bin_attribute pcie_config_attr = { 1290 .attr = { 1291 .name = "config", 1292 .mode = S_IRUGO | S_IWUSR, 1293 }, 1294 .size = PCI_CFG_SPACE_EXP_SIZE, 1295 .read = pci_read_config, 1296 .write = pci_write_config, 1297 }; 1298 1299 static ssize_t reset_store(struct device *dev, struct device_attribute *attr, 1300 const char *buf, size_t count) 1301 { 1302 struct pci_dev *pdev = to_pci_dev(dev); 1303 unsigned long val; 1304 ssize_t result = kstrtoul(buf, 0, &val); 1305 1306 if (result < 0) 1307 return result; 1308 1309 if (val != 1) 1310 return -EINVAL; 1311 1312 result = pci_reset_function(pdev); 1313 if (result < 0) 1314 return result; 1315 1316 return count; 1317 } 1318 1319 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store); 1320 1321 static int pci_create_capabilities_sysfs(struct pci_dev *dev) 1322 { 1323 int retval; 1324 struct bin_attribute *attr; 1325 1326 /* If the device has VPD, try to expose it in sysfs. */ 1327 if (dev->vpd) { 1328 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1329 if (!attr) 1330 return -ENOMEM; 1331 1332 sysfs_bin_attr_init(attr); 1333 attr->size = 0; 1334 attr->attr.name = "vpd"; 1335 attr->attr.mode = S_IRUSR | S_IWUSR; 1336 attr->read = read_vpd_attr; 1337 attr->write = write_vpd_attr; 1338 retval = sysfs_create_bin_file(&dev->dev.kobj, attr); 1339 if (retval) { 1340 kfree(attr); 1341 return retval; 1342 } 1343 dev->vpd->attr = attr; 1344 } 1345 1346 /* Active State Power Management */ 1347 pcie_aspm_create_sysfs_dev_files(dev); 1348 1349 if (!pci_probe_reset_function(dev)) { 1350 retval = device_create_file(&dev->dev, &reset_attr); 1351 if (retval) 1352 goto error; 1353 dev->reset_fn = 1; 1354 } 1355 return 0; 1356 1357 error: 1358 pcie_aspm_remove_sysfs_dev_files(dev); 1359 if (dev->vpd && dev->vpd->attr) { 1360 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); 1361 kfree(dev->vpd->attr); 1362 } 1363 1364 return retval; 1365 } 1366 1367 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) 1368 { 1369 int retval; 1370 int rom_size; 1371 struct bin_attribute *attr; 1372 1373 if (!sysfs_initialized) 1374 return -EACCES; 1375 1376 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1377 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1378 else 1379 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); 1380 if (retval) 1381 goto err; 1382 1383 retval = pci_create_resource_files(pdev); 1384 if (retval) 1385 goto err_config_file; 1386 1387 /* If the device has a ROM, try to expose it in sysfs. */ 1388 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1389 if (rom_size) { 1390 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1391 if (!attr) { 1392 retval = -ENOMEM; 1393 goto err_resource_files; 1394 } 1395 sysfs_bin_attr_init(attr); 1396 attr->size = rom_size; 1397 attr->attr.name = "rom"; 1398 attr->attr.mode = S_IRUSR | S_IWUSR; 1399 attr->read = pci_read_rom; 1400 attr->write = pci_write_rom; 1401 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); 1402 if (retval) { 1403 kfree(attr); 1404 goto err_resource_files; 1405 } 1406 pdev->rom_attr = attr; 1407 } 1408 1409 /* add sysfs entries for various capabilities */ 1410 retval = pci_create_capabilities_sysfs(pdev); 1411 if (retval) 1412 goto err_rom_file; 1413 1414 pci_create_firmware_label_files(pdev); 1415 1416 return 0; 1417 1418 err_rom_file: 1419 if (pdev->rom_attr) { 1420 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1421 kfree(pdev->rom_attr); 1422 pdev->rom_attr = NULL; 1423 } 1424 err_resource_files: 1425 pci_remove_resource_files(pdev); 1426 err_config_file: 1427 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1428 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1429 else 1430 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1431 err: 1432 return retval; 1433 } 1434 1435 static void pci_remove_capabilities_sysfs(struct pci_dev *dev) 1436 { 1437 if (dev->vpd && dev->vpd->attr) { 1438 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); 1439 kfree(dev->vpd->attr); 1440 } 1441 1442 pcie_aspm_remove_sysfs_dev_files(dev); 1443 if (dev->reset_fn) { 1444 device_remove_file(&dev->dev, &reset_attr); 1445 dev->reset_fn = 0; 1446 } 1447 } 1448 1449 /** 1450 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files 1451 * @pdev: device whose entries we should free 1452 * 1453 * Cleanup when @pdev is removed from sysfs. 1454 */ 1455 void pci_remove_sysfs_dev_files(struct pci_dev *pdev) 1456 { 1457 if (!sysfs_initialized) 1458 return; 1459 1460 pci_remove_capabilities_sysfs(pdev); 1461 1462 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) 1463 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1464 else 1465 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1466 1467 pci_remove_resource_files(pdev); 1468 1469 if (pdev->rom_attr) { 1470 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1471 kfree(pdev->rom_attr); 1472 pdev->rom_attr = NULL; 1473 } 1474 1475 pci_remove_firmware_label_files(pdev); 1476 } 1477 1478 static int __init pci_sysfs_init(void) 1479 { 1480 struct pci_dev *pdev = NULL; 1481 int retval; 1482 1483 sysfs_initialized = 1; 1484 for_each_pci_dev(pdev) { 1485 retval = pci_create_sysfs_dev_files(pdev); 1486 if (retval) { 1487 pci_dev_put(pdev); 1488 return retval; 1489 } 1490 } 1491 1492 return 0; 1493 } 1494 late_initcall(pci_sysfs_init); 1495 1496 static struct attribute *pci_dev_dev_attrs[] = { 1497 &vga_attr.attr, 1498 NULL, 1499 }; 1500 1501 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj, 1502 struct attribute *a, int n) 1503 { 1504 struct device *dev = kobj_to_dev(kobj); 1505 struct pci_dev *pdev = to_pci_dev(dev); 1506 1507 if (a == &vga_attr.attr) 1508 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 1509 return 0; 1510 1511 return a->mode; 1512 } 1513 1514 static struct attribute *pci_dev_hp_attrs[] = { 1515 &dev_remove_attr.attr, 1516 &dev_rescan_attr.attr, 1517 NULL, 1518 }; 1519 1520 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj, 1521 struct attribute *a, int n) 1522 { 1523 struct device *dev = kobj_to_dev(kobj); 1524 struct pci_dev *pdev = to_pci_dev(dev); 1525 1526 if (pdev->is_virtfn) 1527 return 0; 1528 1529 return a->mode; 1530 } 1531 1532 static struct attribute_group pci_dev_hp_attr_group = { 1533 .attrs = pci_dev_hp_attrs, 1534 .is_visible = pci_dev_hp_attrs_are_visible, 1535 }; 1536 1537 #ifdef CONFIG_PCI_IOV 1538 static struct attribute *sriov_dev_attrs[] = { 1539 &sriov_totalvfs_attr.attr, 1540 &sriov_numvfs_attr.attr, 1541 NULL, 1542 }; 1543 1544 static umode_t sriov_attrs_are_visible(struct kobject *kobj, 1545 struct attribute *a, int n) 1546 { 1547 struct device *dev = kobj_to_dev(kobj); 1548 1549 if (!dev_is_pf(dev)) 1550 return 0; 1551 1552 return a->mode; 1553 } 1554 1555 static struct attribute_group sriov_dev_attr_group = { 1556 .attrs = sriov_dev_attrs, 1557 .is_visible = sriov_attrs_are_visible, 1558 }; 1559 #endif /* CONFIG_PCI_IOV */ 1560 1561 static struct attribute_group pci_dev_attr_group = { 1562 .attrs = pci_dev_dev_attrs, 1563 .is_visible = pci_dev_attrs_are_visible, 1564 }; 1565 1566 static const struct attribute_group *pci_dev_attr_groups[] = { 1567 &pci_dev_attr_group, 1568 &pci_dev_hp_attr_group, 1569 #ifdef CONFIG_PCI_IOV 1570 &sriov_dev_attr_group, 1571 #endif 1572 NULL, 1573 }; 1574 1575 struct device_type pci_dev_type = { 1576 .groups = pci_dev_attr_groups, 1577 }; 1578