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_online(node)) 220 return -EINVAL; 221 222 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); 223 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.", 224 node); 225 226 dev->numa_node = node; 227 return count; 228 } 229 230 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, 231 char *buf) 232 { 233 return sprintf(buf, "%d\n", dev->numa_node); 234 } 235 static DEVICE_ATTR_RW(numa_node); 236 #endif 237 238 static ssize_t dma_mask_bits_show(struct device *dev, 239 struct device_attribute *attr, char *buf) 240 { 241 struct pci_dev *pdev = to_pci_dev(dev); 242 243 return sprintf(buf, "%d\n", fls64(pdev->dma_mask)); 244 } 245 static DEVICE_ATTR_RO(dma_mask_bits); 246 247 static ssize_t consistent_dma_mask_bits_show(struct device *dev, 248 struct device_attribute *attr, 249 char *buf) 250 { 251 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask)); 252 } 253 static DEVICE_ATTR_RO(consistent_dma_mask_bits); 254 255 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr, 256 char *buf) 257 { 258 struct pci_dev *pdev = to_pci_dev(dev); 259 struct pci_bus *subordinate = pdev->subordinate; 260 261 return sprintf(buf, "%u\n", subordinate ? 262 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) 263 : !pdev->no_msi); 264 } 265 266 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr, 267 const char *buf, size_t count) 268 { 269 struct pci_dev *pdev = to_pci_dev(dev); 270 struct pci_bus *subordinate = pdev->subordinate; 271 unsigned long val; 272 273 if (kstrtoul(buf, 0, &val) < 0) 274 return -EINVAL; 275 276 if (!capable(CAP_SYS_ADMIN)) 277 return -EPERM; 278 279 /* 280 * "no_msi" and "bus_flags" only affect what happens when a driver 281 * requests MSI or MSI-X. They don't affect any drivers that have 282 * already requested MSI or MSI-X. 283 */ 284 if (!subordinate) { 285 pdev->no_msi = !val; 286 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n", 287 val ? "allowed" : "disallowed"); 288 return count; 289 } 290 291 if (val) 292 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; 293 else 294 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; 295 296 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n", 297 val ? "allowed" : "disallowed"); 298 return count; 299 } 300 static DEVICE_ATTR_RW(msi_bus); 301 302 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, 303 size_t count) 304 { 305 unsigned long val; 306 struct pci_bus *b = NULL; 307 308 if (kstrtoul(buf, 0, &val) < 0) 309 return -EINVAL; 310 311 if (val) { 312 pci_lock_rescan_remove(); 313 while ((b = pci_find_next_bus(b)) != NULL) 314 pci_rescan_bus(b); 315 pci_unlock_rescan_remove(); 316 } 317 return count; 318 } 319 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store); 320 321 static struct attribute *pci_bus_attrs[] = { 322 &bus_attr_rescan.attr, 323 NULL, 324 }; 325 326 static const struct attribute_group pci_bus_group = { 327 .attrs = pci_bus_attrs, 328 }; 329 330 const struct attribute_group *pci_bus_groups[] = { 331 &pci_bus_group, 332 NULL, 333 }; 334 335 static ssize_t dev_rescan_store(struct device *dev, 336 struct device_attribute *attr, const char *buf, 337 size_t count) 338 { 339 unsigned long val; 340 struct pci_dev *pdev = to_pci_dev(dev); 341 342 if (kstrtoul(buf, 0, &val) < 0) 343 return -EINVAL; 344 345 if (val) { 346 pci_lock_rescan_remove(); 347 pci_rescan_bus(pdev->bus); 348 pci_unlock_rescan_remove(); 349 } 350 return count; 351 } 352 static struct device_attribute dev_rescan_attr = __ATTR(rescan, 353 (S_IWUSR|S_IWGRP), 354 NULL, dev_rescan_store); 355 356 static ssize_t remove_store(struct device *dev, struct device_attribute *attr, 357 const char *buf, size_t count) 358 { 359 unsigned long val; 360 361 if (kstrtoul(buf, 0, &val) < 0) 362 return -EINVAL; 363 364 if (val && device_remove_file_self(dev, attr)) 365 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); 366 return count; 367 } 368 static struct device_attribute dev_remove_attr = __ATTR(remove, 369 (S_IWUSR|S_IWGRP), 370 NULL, remove_store); 371 372 static ssize_t dev_bus_rescan_store(struct device *dev, 373 struct device_attribute *attr, 374 const char *buf, size_t count) 375 { 376 unsigned long val; 377 struct pci_bus *bus = to_pci_bus(dev); 378 379 if (kstrtoul(buf, 0, &val) < 0) 380 return -EINVAL; 381 382 if (val) { 383 pci_lock_rescan_remove(); 384 if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) 385 pci_rescan_bus_bridge_resize(bus->self); 386 else 387 pci_rescan_bus(bus); 388 pci_unlock_rescan_remove(); 389 } 390 return count; 391 } 392 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store); 393 394 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 395 static ssize_t d3cold_allowed_store(struct device *dev, 396 struct device_attribute *attr, 397 const char *buf, size_t count) 398 { 399 struct pci_dev *pdev = to_pci_dev(dev); 400 unsigned long val; 401 402 if (kstrtoul(buf, 0, &val) < 0) 403 return -EINVAL; 404 405 pdev->d3cold_allowed = !!val; 406 pm_runtime_resume(dev); 407 408 return count; 409 } 410 411 static ssize_t d3cold_allowed_show(struct device *dev, 412 struct device_attribute *attr, char *buf) 413 { 414 struct pci_dev *pdev = to_pci_dev(dev); 415 return sprintf(buf, "%u\n", pdev->d3cold_allowed); 416 } 417 static DEVICE_ATTR_RW(d3cold_allowed); 418 #endif 419 420 #ifdef CONFIG_OF 421 static ssize_t devspec_show(struct device *dev, 422 struct device_attribute *attr, char *buf) 423 { 424 struct pci_dev *pdev = to_pci_dev(dev); 425 struct device_node *np = pci_device_to_OF_node(pdev); 426 427 if (np == NULL || np->full_name == NULL) 428 return 0; 429 return sprintf(buf, "%s", np->full_name); 430 } 431 static DEVICE_ATTR_RO(devspec); 432 #endif 433 434 #ifdef CONFIG_PCI_IOV 435 static ssize_t sriov_totalvfs_show(struct device *dev, 436 struct device_attribute *attr, 437 char *buf) 438 { 439 struct pci_dev *pdev = to_pci_dev(dev); 440 441 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev)); 442 } 443 444 445 static ssize_t sriov_numvfs_show(struct device *dev, 446 struct device_attribute *attr, 447 char *buf) 448 { 449 struct pci_dev *pdev = to_pci_dev(dev); 450 451 return sprintf(buf, "%u\n", pdev->sriov->num_VFs); 452 } 453 454 /* 455 * num_vfs > 0; number of VFs to enable 456 * num_vfs = 0; disable all VFs 457 * 458 * Note: SRIOV spec doesn't allow partial VF 459 * disable, so it's all or none. 460 */ 461 static ssize_t sriov_numvfs_store(struct device *dev, 462 struct device_attribute *attr, 463 const char *buf, size_t count) 464 { 465 struct pci_dev *pdev = to_pci_dev(dev); 466 int ret; 467 u16 num_vfs; 468 469 ret = kstrtou16(buf, 0, &num_vfs); 470 if (ret < 0) 471 return ret; 472 473 if (num_vfs > pci_sriov_get_totalvfs(pdev)) 474 return -ERANGE; 475 476 if (num_vfs == pdev->sriov->num_VFs) 477 return count; /* no change */ 478 479 /* is PF driver loaded w/callback */ 480 if (!pdev->driver || !pdev->driver->sriov_configure) { 481 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n"); 482 return -ENOSYS; 483 } 484 485 if (num_vfs == 0) { 486 /* disable VFs */ 487 ret = pdev->driver->sriov_configure(pdev, 0); 488 if (ret < 0) 489 return ret; 490 return count; 491 } 492 493 /* enable VFs */ 494 if (pdev->sriov->num_VFs) { 495 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n", 496 pdev->sriov->num_VFs, num_vfs); 497 return -EBUSY; 498 } 499 500 ret = pdev->driver->sriov_configure(pdev, num_vfs); 501 if (ret < 0) 502 return ret; 503 504 if (ret != num_vfs) 505 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n", 506 num_vfs, ret); 507 508 return count; 509 } 510 511 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs); 512 static struct device_attribute sriov_numvfs_attr = 513 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP), 514 sriov_numvfs_show, sriov_numvfs_store); 515 #endif /* CONFIG_PCI_IOV */ 516 517 static ssize_t driver_override_store(struct device *dev, 518 struct device_attribute *attr, 519 const char *buf, size_t count) 520 { 521 struct pci_dev *pdev = to_pci_dev(dev); 522 char *driver_override, *old = pdev->driver_override, *cp; 523 524 if (count > PATH_MAX) 525 return -EINVAL; 526 527 driver_override = kstrndup(buf, count, GFP_KERNEL); 528 if (!driver_override) 529 return -ENOMEM; 530 531 cp = strchr(driver_override, '\n'); 532 if (cp) 533 *cp = '\0'; 534 535 if (strlen(driver_override)) { 536 pdev->driver_override = driver_override; 537 } else { 538 kfree(driver_override); 539 pdev->driver_override = NULL; 540 } 541 542 kfree(old); 543 544 return count; 545 } 546 547 static ssize_t driver_override_show(struct device *dev, 548 struct device_attribute *attr, char *buf) 549 { 550 struct pci_dev *pdev = to_pci_dev(dev); 551 552 return sprintf(buf, "%s\n", pdev->driver_override); 553 } 554 static DEVICE_ATTR_RW(driver_override); 555 556 static struct attribute *pci_dev_attrs[] = { 557 &dev_attr_resource.attr, 558 &dev_attr_vendor.attr, 559 &dev_attr_device.attr, 560 &dev_attr_subsystem_vendor.attr, 561 &dev_attr_subsystem_device.attr, 562 &dev_attr_class.attr, 563 &dev_attr_irq.attr, 564 &dev_attr_local_cpus.attr, 565 &dev_attr_local_cpulist.attr, 566 &dev_attr_modalias.attr, 567 #ifdef CONFIG_NUMA 568 &dev_attr_numa_node.attr, 569 #endif 570 &dev_attr_dma_mask_bits.attr, 571 &dev_attr_consistent_dma_mask_bits.attr, 572 &dev_attr_enable.attr, 573 &dev_attr_broken_parity_status.attr, 574 &dev_attr_msi_bus.attr, 575 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 576 &dev_attr_d3cold_allowed.attr, 577 #endif 578 #ifdef CONFIG_OF 579 &dev_attr_devspec.attr, 580 #endif 581 &dev_attr_driver_override.attr, 582 NULL, 583 }; 584 585 static const struct attribute_group pci_dev_group = { 586 .attrs = pci_dev_attrs, 587 }; 588 589 const struct attribute_group *pci_dev_groups[] = { 590 &pci_dev_group, 591 NULL, 592 }; 593 594 static struct attribute *pcibus_attrs[] = { 595 &dev_attr_rescan.attr, 596 &dev_attr_cpuaffinity.attr, 597 &dev_attr_cpulistaffinity.attr, 598 NULL, 599 }; 600 601 static const struct attribute_group pcibus_group = { 602 .attrs = pcibus_attrs, 603 }; 604 605 const struct attribute_group *pcibus_groups[] = { 606 &pcibus_group, 607 NULL, 608 }; 609 610 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, 611 char *buf) 612 { 613 struct pci_dev *pdev = to_pci_dev(dev); 614 struct pci_dev *vga_dev = vga_default_device(); 615 616 if (vga_dev) 617 return sprintf(buf, "%u\n", (pdev == vga_dev)); 618 619 return sprintf(buf, "%u\n", 620 !!(pdev->resource[PCI_ROM_RESOURCE].flags & 621 IORESOURCE_ROM_SHADOW)); 622 } 623 static struct device_attribute vga_attr = __ATTR_RO(boot_vga); 624 625 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, 626 struct bin_attribute *bin_attr, char *buf, 627 loff_t off, size_t count) 628 { 629 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device, 630 kobj)); 631 unsigned int size = 64; 632 loff_t init_off = off; 633 u8 *data = (u8 *) buf; 634 635 /* Several chips lock up trying to read undefined config space */ 636 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) 637 size = dev->cfg_size; 638 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 639 size = 128; 640 641 if (off > size) 642 return 0; 643 if (off + count > size) { 644 size -= off; 645 count = size; 646 } else { 647 size = count; 648 } 649 650 pci_config_pm_runtime_get(dev); 651 652 if ((off & 1) && size) { 653 u8 val; 654 pci_user_read_config_byte(dev, off, &val); 655 data[off - init_off] = val; 656 off++; 657 size--; 658 } 659 660 if ((off & 3) && size > 2) { 661 u16 val; 662 pci_user_read_config_word(dev, off, &val); 663 data[off - init_off] = val & 0xff; 664 data[off - init_off + 1] = (val >> 8) & 0xff; 665 off += 2; 666 size -= 2; 667 } 668 669 while (size > 3) { 670 u32 val; 671 pci_user_read_config_dword(dev, off, &val); 672 data[off - init_off] = val & 0xff; 673 data[off - init_off + 1] = (val >> 8) & 0xff; 674 data[off - init_off + 2] = (val >> 16) & 0xff; 675 data[off - init_off + 3] = (val >> 24) & 0xff; 676 off += 4; 677 size -= 4; 678 } 679 680 if (size >= 2) { 681 u16 val; 682 pci_user_read_config_word(dev, off, &val); 683 data[off - init_off] = val & 0xff; 684 data[off - init_off + 1] = (val >> 8) & 0xff; 685 off += 2; 686 size -= 2; 687 } 688 689 if (size > 0) { 690 u8 val; 691 pci_user_read_config_byte(dev, off, &val); 692 data[off - init_off] = val; 693 off++; 694 --size; 695 } 696 697 pci_config_pm_runtime_put(dev); 698 699 return count; 700 } 701 702 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, 703 struct bin_attribute *bin_attr, char *buf, 704 loff_t off, size_t count) 705 { 706 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device, 707 kobj)); 708 unsigned int size = count; 709 loff_t init_off = off; 710 u8 *data = (u8 *) buf; 711 712 if (off > dev->cfg_size) 713 return 0; 714 if (off + count > dev->cfg_size) { 715 size = dev->cfg_size - off; 716 count = size; 717 } 718 719 pci_config_pm_runtime_get(dev); 720 721 if ((off & 1) && size) { 722 pci_user_write_config_byte(dev, off, data[off - init_off]); 723 off++; 724 size--; 725 } 726 727 if ((off & 3) && size > 2) { 728 u16 val = data[off - init_off]; 729 val |= (u16) data[off - init_off + 1] << 8; 730 pci_user_write_config_word(dev, off, val); 731 off += 2; 732 size -= 2; 733 } 734 735 while (size > 3) { 736 u32 val = data[off - init_off]; 737 val |= (u32) data[off - init_off + 1] << 8; 738 val |= (u32) data[off - init_off + 2] << 16; 739 val |= (u32) data[off - init_off + 3] << 24; 740 pci_user_write_config_dword(dev, off, val); 741 off += 4; 742 size -= 4; 743 } 744 745 if (size >= 2) { 746 u16 val = data[off - init_off]; 747 val |= (u16) data[off - init_off + 1] << 8; 748 pci_user_write_config_word(dev, off, val); 749 off += 2; 750 size -= 2; 751 } 752 753 if (size) { 754 pci_user_write_config_byte(dev, off, data[off - init_off]); 755 off++; 756 --size; 757 } 758 759 pci_config_pm_runtime_put(dev); 760 761 return count; 762 } 763 764 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj, 765 struct bin_attribute *bin_attr, char *buf, 766 loff_t off, size_t count) 767 { 768 struct pci_dev *dev = 769 to_pci_dev(container_of(kobj, struct device, kobj)); 770 771 if (off > bin_attr->size) 772 count = 0; 773 else if (count > bin_attr->size - off) 774 count = bin_attr->size - off; 775 776 return pci_read_vpd(dev, off, count, buf); 777 } 778 779 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj, 780 struct bin_attribute *bin_attr, char *buf, 781 loff_t off, size_t count) 782 { 783 struct pci_dev *dev = 784 to_pci_dev(container_of(kobj, struct device, kobj)); 785 786 if (off > bin_attr->size) 787 count = 0; 788 else if (count > bin_attr->size - off) 789 count = bin_attr->size - off; 790 791 return pci_write_vpd(dev, off, count, buf); 792 } 793 794 #ifdef HAVE_PCI_LEGACY 795 /** 796 * pci_read_legacy_io - read byte(s) from legacy I/O port space 797 * @filp: open sysfs file 798 * @kobj: kobject corresponding to file to read from 799 * @bin_attr: struct bin_attribute for this file 800 * @buf: buffer to store results 801 * @off: offset into legacy I/O port space 802 * @count: number of bytes to read 803 * 804 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific 805 * callback routine (pci_legacy_read). 806 */ 807 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, 808 struct bin_attribute *bin_attr, char *buf, 809 loff_t off, size_t count) 810 { 811 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 812 kobj)); 813 814 /* Only support 1, 2 or 4 byte accesses */ 815 if (count != 1 && count != 2 && count != 4) 816 return -EINVAL; 817 818 return pci_legacy_read(bus, off, (u32 *)buf, count); 819 } 820 821 /** 822 * pci_write_legacy_io - write byte(s) to legacy I/O port space 823 * @filp: open sysfs file 824 * @kobj: kobject corresponding to file to read from 825 * @bin_attr: struct bin_attribute for this file 826 * @buf: buffer containing value to be written 827 * @off: offset into legacy I/O port space 828 * @count: number of bytes to write 829 * 830 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific 831 * callback routine (pci_legacy_write). 832 */ 833 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj, 834 struct bin_attribute *bin_attr, char *buf, 835 loff_t off, size_t count) 836 { 837 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 838 kobj)); 839 840 /* Only support 1, 2 or 4 byte accesses */ 841 if (count != 1 && count != 2 && count != 4) 842 return -EINVAL; 843 844 return pci_legacy_write(bus, off, *(u32 *)buf, count); 845 } 846 847 /** 848 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space 849 * @filp: open sysfs file 850 * @kobj: kobject corresponding to device to be mapped 851 * @attr: struct bin_attribute for this file 852 * @vma: struct vm_area_struct passed to mmap 853 * 854 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap 855 * legacy memory space (first meg of bus space) into application virtual 856 * memory space. 857 */ 858 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj, 859 struct bin_attribute *attr, 860 struct vm_area_struct *vma) 861 { 862 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 863 kobj)); 864 865 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem); 866 } 867 868 /** 869 * pci_mmap_legacy_io - map legacy PCI IO into user memory space 870 * @filp: open sysfs file 871 * @kobj: kobject corresponding to device to be mapped 872 * @attr: struct bin_attribute for this file 873 * @vma: struct vm_area_struct passed to mmap 874 * 875 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap 876 * legacy IO space (first meg of bus space) into application virtual 877 * memory space. Returns -ENOSYS if the operation isn't supported 878 */ 879 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj, 880 struct bin_attribute *attr, 881 struct vm_area_struct *vma) 882 { 883 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 884 kobj)); 885 886 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); 887 } 888 889 /** 890 * pci_adjust_legacy_attr - adjustment of legacy file attributes 891 * @b: bus to create files under 892 * @mmap_type: I/O port or memory 893 * 894 * Stub implementation. Can be overridden by arch if necessary. 895 */ 896 void __weak pci_adjust_legacy_attr(struct pci_bus *b, 897 enum pci_mmap_state mmap_type) 898 { 899 } 900 901 /** 902 * pci_create_legacy_files - create legacy I/O port and memory files 903 * @b: bus to create files under 904 * 905 * Some platforms allow access to legacy I/O port and ISA memory space on 906 * a per-bus basis. This routine creates the files and ties them into 907 * their associated read, write and mmap files from pci-sysfs.c 908 * 909 * On error unwind, but don't propagate the error to the caller 910 * as it is ok to set up the PCI bus without these files. 911 */ 912 void pci_create_legacy_files(struct pci_bus *b) 913 { 914 int error; 915 916 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, 917 GFP_ATOMIC); 918 if (!b->legacy_io) 919 goto kzalloc_err; 920 921 sysfs_bin_attr_init(b->legacy_io); 922 b->legacy_io->attr.name = "legacy_io"; 923 b->legacy_io->size = 0xffff; 924 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; 925 b->legacy_io->read = pci_read_legacy_io; 926 b->legacy_io->write = pci_write_legacy_io; 927 b->legacy_io->mmap = pci_mmap_legacy_io; 928 pci_adjust_legacy_attr(b, pci_mmap_io); 929 error = device_create_bin_file(&b->dev, b->legacy_io); 930 if (error) 931 goto legacy_io_err; 932 933 /* Allocated above after the legacy_io struct */ 934 b->legacy_mem = b->legacy_io + 1; 935 sysfs_bin_attr_init(b->legacy_mem); 936 b->legacy_mem->attr.name = "legacy_mem"; 937 b->legacy_mem->size = 1024*1024; 938 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; 939 b->legacy_mem->mmap = pci_mmap_legacy_mem; 940 pci_adjust_legacy_attr(b, pci_mmap_mem); 941 error = device_create_bin_file(&b->dev, b->legacy_mem); 942 if (error) 943 goto legacy_mem_err; 944 945 return; 946 947 legacy_mem_err: 948 device_remove_bin_file(&b->dev, b->legacy_io); 949 legacy_io_err: 950 kfree(b->legacy_io); 951 b->legacy_io = NULL; 952 kzalloc_err: 953 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n"); 954 return; 955 } 956 957 void pci_remove_legacy_files(struct pci_bus *b) 958 { 959 if (b->legacy_io) { 960 device_remove_bin_file(&b->dev, b->legacy_io); 961 device_remove_bin_file(&b->dev, b->legacy_mem); 962 kfree(b->legacy_io); /* both are allocated here */ 963 } 964 } 965 #endif /* HAVE_PCI_LEGACY */ 966 967 #ifdef HAVE_PCI_MMAP 968 969 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, 970 enum pci_mmap_api mmap_api) 971 { 972 unsigned long nr, start, size, pci_start; 973 974 if (pci_resource_len(pdev, resno) == 0) 975 return 0; 976 nr = vma_pages(vma); 977 start = vma->vm_pgoff; 978 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; 979 pci_start = (mmap_api == PCI_MMAP_PROCFS) ? 980 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0; 981 if (start >= pci_start && start < pci_start + size && 982 start + nr <= pci_start + size) 983 return 1; 984 return 0; 985 } 986 987 /** 988 * pci_mmap_resource - map a PCI resource into user memory space 989 * @kobj: kobject for mapping 990 * @attr: struct bin_attribute for the file being mapped 991 * @vma: struct vm_area_struct passed into the mmap 992 * @write_combine: 1 for write_combine mapping 993 * 994 * Use the regular PCI mapping routines to map a PCI resource into userspace. 995 */ 996 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, 997 struct vm_area_struct *vma, int write_combine) 998 { 999 struct pci_dev *pdev = to_pci_dev(container_of(kobj, 1000 struct device, kobj)); 1001 struct resource *res = attr->private; 1002 enum pci_mmap_state mmap_type; 1003 resource_size_t start, end; 1004 int i; 1005 1006 for (i = 0; i < PCI_ROM_RESOURCE; i++) 1007 if (res == &pdev->resource[i]) 1008 break; 1009 if (i >= PCI_ROM_RESOURCE) 1010 return -ENODEV; 1011 1012 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) { 1013 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", 1014 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff, 1015 pci_name(pdev), i, 1016 (u64)pci_resource_start(pdev, i), 1017 (u64)pci_resource_len(pdev, i)); 1018 return -EINVAL; 1019 } 1020 1021 /* pci_mmap_page_range() expects the same kind of entry as coming 1022 * from /proc/bus/pci/ which is a "user visible" value. If this is 1023 * different from the resource itself, arch will do necessary fixup. 1024 */ 1025 pci_resource_to_user(pdev, i, res, &start, &end); 1026 vma->vm_pgoff += start >> PAGE_SHIFT; 1027 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; 1028 1029 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start)) 1030 return -EINVAL; 1031 1032 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine); 1033 } 1034 1035 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj, 1036 struct bin_attribute *attr, 1037 struct vm_area_struct *vma) 1038 { 1039 return pci_mmap_resource(kobj, attr, vma, 0); 1040 } 1041 1042 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj, 1043 struct bin_attribute *attr, 1044 struct vm_area_struct *vma) 1045 { 1046 return pci_mmap_resource(kobj, attr, vma, 1); 1047 } 1048 1049 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, 1050 struct bin_attribute *attr, char *buf, 1051 loff_t off, size_t count, bool write) 1052 { 1053 struct pci_dev *pdev = to_pci_dev(container_of(kobj, 1054 struct device, kobj)); 1055 struct resource *res = attr->private; 1056 unsigned long port = off; 1057 int i; 1058 1059 for (i = 0; i < PCI_ROM_RESOURCE; i++) 1060 if (res == &pdev->resource[i]) 1061 break; 1062 if (i >= PCI_ROM_RESOURCE) 1063 return -ENODEV; 1064 1065 port += pci_resource_start(pdev, i); 1066 1067 if (port > pci_resource_end(pdev, i)) 1068 return 0; 1069 1070 if (port + count - 1 > pci_resource_end(pdev, i)) 1071 return -EINVAL; 1072 1073 switch (count) { 1074 case 1: 1075 if (write) 1076 outb(*(u8 *)buf, port); 1077 else 1078 *(u8 *)buf = inb(port); 1079 return 1; 1080 case 2: 1081 if (write) 1082 outw(*(u16 *)buf, port); 1083 else 1084 *(u16 *)buf = inw(port); 1085 return 2; 1086 case 4: 1087 if (write) 1088 outl(*(u32 *)buf, port); 1089 else 1090 *(u32 *)buf = inl(port); 1091 return 4; 1092 } 1093 return -EINVAL; 1094 } 1095 1096 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj, 1097 struct bin_attribute *attr, char *buf, 1098 loff_t off, size_t count) 1099 { 1100 return pci_resource_io(filp, kobj, attr, buf, off, count, false); 1101 } 1102 1103 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, 1104 struct bin_attribute *attr, char *buf, 1105 loff_t off, size_t count) 1106 { 1107 return pci_resource_io(filp, kobj, attr, buf, off, count, true); 1108 } 1109 1110 /** 1111 * pci_remove_resource_files - cleanup resource files 1112 * @pdev: dev to cleanup 1113 * 1114 * If we created resource files for @pdev, remove them from sysfs and 1115 * free their resources. 1116 */ 1117 static void pci_remove_resource_files(struct pci_dev *pdev) 1118 { 1119 int i; 1120 1121 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1122 struct bin_attribute *res_attr; 1123 1124 res_attr = pdev->res_attr[i]; 1125 if (res_attr) { 1126 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1127 kfree(res_attr); 1128 } 1129 1130 res_attr = pdev->res_attr_wc[i]; 1131 if (res_attr) { 1132 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1133 kfree(res_attr); 1134 } 1135 } 1136 } 1137 1138 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) 1139 { 1140 /* allocate attribute structure, piggyback attribute name */ 1141 int name_len = write_combine ? 13 : 10; 1142 struct bin_attribute *res_attr; 1143 int retval; 1144 1145 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); 1146 if (res_attr) { 1147 char *res_attr_name = (char *)(res_attr + 1); 1148 1149 sysfs_bin_attr_init(res_attr); 1150 if (write_combine) { 1151 pdev->res_attr_wc[num] = res_attr; 1152 sprintf(res_attr_name, "resource%d_wc", num); 1153 res_attr->mmap = pci_mmap_resource_wc; 1154 } else { 1155 pdev->res_attr[num] = res_attr; 1156 sprintf(res_attr_name, "resource%d", num); 1157 res_attr->mmap = pci_mmap_resource_uc; 1158 } 1159 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { 1160 res_attr->read = pci_read_resource_io; 1161 res_attr->write = pci_write_resource_io; 1162 } 1163 res_attr->attr.name = res_attr_name; 1164 res_attr->attr.mode = S_IRUSR | S_IWUSR; 1165 res_attr->size = pci_resource_len(pdev, num); 1166 res_attr->private = &pdev->resource[num]; 1167 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); 1168 } else 1169 retval = -ENOMEM; 1170 1171 return retval; 1172 } 1173 1174 /** 1175 * pci_create_resource_files - create resource files in sysfs for @dev 1176 * @pdev: dev in question 1177 * 1178 * Walk the resources in @pdev creating files for each resource available. 1179 */ 1180 static int pci_create_resource_files(struct pci_dev *pdev) 1181 { 1182 int i; 1183 int retval; 1184 1185 /* Expose the PCI resources from this device as files */ 1186 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1187 1188 /* skip empty resources */ 1189 if (!pci_resource_len(pdev, i)) 1190 continue; 1191 1192 retval = pci_create_attr(pdev, i, 0); 1193 /* for prefetchable resources, create a WC mappable file */ 1194 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) 1195 retval = pci_create_attr(pdev, i, 1); 1196 1197 if (retval) { 1198 pci_remove_resource_files(pdev); 1199 return retval; 1200 } 1201 } 1202 return 0; 1203 } 1204 #else /* !HAVE_PCI_MMAP */ 1205 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } 1206 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } 1207 #endif /* HAVE_PCI_MMAP */ 1208 1209 /** 1210 * pci_write_rom - used to enable access to the PCI ROM display 1211 * @filp: sysfs file 1212 * @kobj: kernel object handle 1213 * @bin_attr: struct bin_attribute for this file 1214 * @buf: user input 1215 * @off: file offset 1216 * @count: number of byte in input 1217 * 1218 * writing anything except 0 enables it 1219 */ 1220 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, 1221 struct bin_attribute *bin_attr, char *buf, 1222 loff_t off, size_t count) 1223 { 1224 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); 1225 1226 if ((off == 0) && (*buf == '0') && (count == 2)) 1227 pdev->rom_attr_enabled = 0; 1228 else 1229 pdev->rom_attr_enabled = 1; 1230 1231 return count; 1232 } 1233 1234 /** 1235 * pci_read_rom - read a PCI ROM 1236 * @filp: sysfs file 1237 * @kobj: kernel object handle 1238 * @bin_attr: struct bin_attribute for this file 1239 * @buf: where to put the data we read from the ROM 1240 * @off: file offset 1241 * @count: number of bytes to read 1242 * 1243 * Put @count bytes starting at @off into @buf from the ROM in the PCI 1244 * device corresponding to @kobj. 1245 */ 1246 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, 1247 struct bin_attribute *bin_attr, char *buf, 1248 loff_t off, size_t count) 1249 { 1250 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); 1251 void __iomem *rom; 1252 size_t size; 1253 1254 if (!pdev->rom_attr_enabled) 1255 return -EINVAL; 1256 1257 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ 1258 if (!rom || !size) 1259 return -EIO; 1260 1261 if (off >= size) 1262 count = 0; 1263 else { 1264 if (off + count > size) 1265 count = size - off; 1266 1267 memcpy_fromio(buf, rom + off, count); 1268 } 1269 pci_unmap_rom(pdev, rom); 1270 1271 return count; 1272 } 1273 1274 static struct bin_attribute pci_config_attr = { 1275 .attr = { 1276 .name = "config", 1277 .mode = S_IRUGO | S_IWUSR, 1278 }, 1279 .size = PCI_CFG_SPACE_SIZE, 1280 .read = pci_read_config, 1281 .write = pci_write_config, 1282 }; 1283 1284 static struct bin_attribute pcie_config_attr = { 1285 .attr = { 1286 .name = "config", 1287 .mode = S_IRUGO | S_IWUSR, 1288 }, 1289 .size = PCI_CFG_SPACE_EXP_SIZE, 1290 .read = pci_read_config, 1291 .write = pci_write_config, 1292 }; 1293 1294 static ssize_t reset_store(struct device *dev, struct device_attribute *attr, 1295 const char *buf, size_t count) 1296 { 1297 struct pci_dev *pdev = to_pci_dev(dev); 1298 unsigned long val; 1299 ssize_t result = kstrtoul(buf, 0, &val); 1300 1301 if (result < 0) 1302 return result; 1303 1304 if (val != 1) 1305 return -EINVAL; 1306 1307 result = pci_reset_function(pdev); 1308 if (result < 0) 1309 return result; 1310 1311 return count; 1312 } 1313 1314 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store); 1315 1316 static int pci_create_capabilities_sysfs(struct pci_dev *dev) 1317 { 1318 int retval; 1319 struct bin_attribute *attr; 1320 1321 /* If the device has VPD, try to expose it in sysfs. */ 1322 if (dev->vpd) { 1323 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1324 if (!attr) 1325 return -ENOMEM; 1326 1327 sysfs_bin_attr_init(attr); 1328 attr->size = dev->vpd->len; 1329 attr->attr.name = "vpd"; 1330 attr->attr.mode = S_IRUSR | S_IWUSR; 1331 attr->read = read_vpd_attr; 1332 attr->write = write_vpd_attr; 1333 retval = sysfs_create_bin_file(&dev->dev.kobj, attr); 1334 if (retval) { 1335 kfree(attr); 1336 return retval; 1337 } 1338 dev->vpd->attr = attr; 1339 } 1340 1341 /* Active State Power Management */ 1342 pcie_aspm_create_sysfs_dev_files(dev); 1343 1344 if (!pci_probe_reset_function(dev)) { 1345 retval = device_create_file(&dev->dev, &reset_attr); 1346 if (retval) 1347 goto error; 1348 dev->reset_fn = 1; 1349 } 1350 return 0; 1351 1352 error: 1353 pcie_aspm_remove_sysfs_dev_files(dev); 1354 if (dev->vpd && dev->vpd->attr) { 1355 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); 1356 kfree(dev->vpd->attr); 1357 } 1358 1359 return retval; 1360 } 1361 1362 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) 1363 { 1364 int retval; 1365 int rom_size = 0; 1366 struct bin_attribute *attr; 1367 1368 if (!sysfs_initialized) 1369 return -EACCES; 1370 1371 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) 1372 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); 1373 else 1374 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1375 if (retval) 1376 goto err; 1377 1378 retval = pci_create_resource_files(pdev); 1379 if (retval) 1380 goto err_config_file; 1381 1382 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) 1383 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1384 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) 1385 rom_size = 0x20000; 1386 1387 /* If the device has a ROM, try to expose it in sysfs. */ 1388 if (rom_size) { 1389 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1390 if (!attr) { 1391 retval = -ENOMEM; 1392 goto err_resource_files; 1393 } 1394 sysfs_bin_attr_init(attr); 1395 attr->size = rom_size; 1396 attr->attr.name = "rom"; 1397 attr->attr.mode = S_IRUSR | S_IWUSR; 1398 attr->read = pci_read_rom; 1399 attr->write = pci_write_rom; 1400 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); 1401 if (retval) { 1402 kfree(attr); 1403 goto err_resource_files; 1404 } 1405 pdev->rom_attr = attr; 1406 } 1407 1408 /* add sysfs entries for various capabilities */ 1409 retval = pci_create_capabilities_sysfs(pdev); 1410 if (retval) 1411 goto err_rom_file; 1412 1413 pci_create_firmware_label_files(pdev); 1414 1415 return 0; 1416 1417 err_rom_file: 1418 if (rom_size) { 1419 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1420 kfree(pdev->rom_attr); 1421 pdev->rom_attr = NULL; 1422 } 1423 err_resource_files: 1424 pci_remove_resource_files(pdev); 1425 err_config_file: 1426 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) 1427 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1428 else 1429 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1430 err: 1431 return retval; 1432 } 1433 1434 static void pci_remove_capabilities_sysfs(struct pci_dev *dev) 1435 { 1436 if (dev->vpd && dev->vpd->attr) { 1437 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); 1438 kfree(dev->vpd->attr); 1439 } 1440 1441 pcie_aspm_remove_sysfs_dev_files(dev); 1442 if (dev->reset_fn) { 1443 device_remove_file(&dev->dev, &reset_attr); 1444 dev->reset_fn = 0; 1445 } 1446 } 1447 1448 /** 1449 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files 1450 * @pdev: device whose entries we should free 1451 * 1452 * Cleanup when @pdev is removed from sysfs. 1453 */ 1454 void pci_remove_sysfs_dev_files(struct pci_dev *pdev) 1455 { 1456 int rom_size = 0; 1457 1458 if (!sysfs_initialized) 1459 return; 1460 1461 pci_remove_capabilities_sysfs(pdev); 1462 1463 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) 1464 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1465 else 1466 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1467 1468 pci_remove_resource_files(pdev); 1469 1470 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) 1471 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1472 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) 1473 rom_size = 0x20000; 1474 1475 if (rom_size && pdev->rom_attr) { 1476 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1477 kfree(pdev->rom_attr); 1478 } 1479 1480 pci_remove_firmware_label_files(pdev); 1481 1482 } 1483 1484 static int __init pci_sysfs_init(void) 1485 { 1486 struct pci_dev *pdev = NULL; 1487 int retval; 1488 1489 sysfs_initialized = 1; 1490 for_each_pci_dev(pdev) { 1491 retval = pci_create_sysfs_dev_files(pdev); 1492 if (retval) { 1493 pci_dev_put(pdev); 1494 return retval; 1495 } 1496 } 1497 1498 return 0; 1499 } 1500 late_initcall(pci_sysfs_init); 1501 1502 static struct attribute *pci_dev_dev_attrs[] = { 1503 &vga_attr.attr, 1504 NULL, 1505 }; 1506 1507 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj, 1508 struct attribute *a, int n) 1509 { 1510 struct device *dev = container_of(kobj, struct device, kobj); 1511 struct pci_dev *pdev = to_pci_dev(dev); 1512 1513 if (a == &vga_attr.attr) 1514 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 1515 return 0; 1516 1517 return a->mode; 1518 } 1519 1520 static struct attribute *pci_dev_hp_attrs[] = { 1521 &dev_remove_attr.attr, 1522 &dev_rescan_attr.attr, 1523 NULL, 1524 }; 1525 1526 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj, 1527 struct attribute *a, int n) 1528 { 1529 struct device *dev = container_of(kobj, struct device, kobj); 1530 struct pci_dev *pdev = to_pci_dev(dev); 1531 1532 if (pdev->is_virtfn) 1533 return 0; 1534 1535 return a->mode; 1536 } 1537 1538 static struct attribute_group pci_dev_hp_attr_group = { 1539 .attrs = pci_dev_hp_attrs, 1540 .is_visible = pci_dev_hp_attrs_are_visible, 1541 }; 1542 1543 #ifdef CONFIG_PCI_IOV 1544 static struct attribute *sriov_dev_attrs[] = { 1545 &sriov_totalvfs_attr.attr, 1546 &sriov_numvfs_attr.attr, 1547 NULL, 1548 }; 1549 1550 static umode_t sriov_attrs_are_visible(struct kobject *kobj, 1551 struct attribute *a, int n) 1552 { 1553 struct device *dev = container_of(kobj, struct device, kobj); 1554 1555 if (!dev_is_pf(dev)) 1556 return 0; 1557 1558 return a->mode; 1559 } 1560 1561 static struct attribute_group sriov_dev_attr_group = { 1562 .attrs = sriov_dev_attrs, 1563 .is_visible = sriov_attrs_are_visible, 1564 }; 1565 #endif /* CONFIG_PCI_IOV */ 1566 1567 static struct attribute_group pci_dev_attr_group = { 1568 .attrs = pci_dev_dev_attrs, 1569 .is_visible = pci_dev_attrs_are_visible, 1570 }; 1571 1572 static const struct attribute_group *pci_dev_attr_groups[] = { 1573 &pci_dev_attr_group, 1574 &pci_dev_hp_attr_group, 1575 #ifdef CONFIG_PCI_IOV 1576 &sriov_dev_attr_group, 1577 #endif 1578 NULL, 1579 }; 1580 1581 struct device_type pci_dev_type = { 1582 .groups = pci_dev_attr_groups, 1583 }; 1584