drivers/pci/pci-sysfs.c

   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/pci.h>
  20 #include <linux/stat.h>
  21 #include <linux/topology.h>
  22 #include <linux/mm.h>
  23
  24 #include "pci.h"
  25
  26 static int sysfs_initialized;   /* = 0 */
  27
  28 /* show configuration fields */
  29 #define pci_config_attr(field, format_string)                           \
  30 static ssize_t                                                          \
  31 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  32 {                                                                       \
  33         struct pci_dev *pdev;                                           \
  34                                                                         \
  35         pdev = to_pci_dev (dev);                                        \
  36         return sprintf (buf, format_string, pdev->field);               \
  37 }
  38
  39 pci_config_attr(vendor, "0x%04x\n");
  40 pci_config_attr(device, "0x%04x\n");
  41 pci_config_attr(subsystem_vendor, "0x%04x\n");
  42 pci_config_attr(subsystem_device, "0x%04x\n");
  43 pci_config_attr(class, "0x%06x\n");
  44 pci_config_attr(irq, "%u\n");
  45
  46 static ssize_t broken_parity_status_show(struct device *dev,
  47                                          struct device_attribute *attr,
  48                                          char *buf)
  49 {
  50         struct pci_dev *pdev = to_pci_dev(dev);
  51         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  52 }
  53
  54 static ssize_t broken_parity_status_store(struct device *dev,
  55                                           struct device_attribute *attr,
  56                                           const char *buf, size_t count)
  57 {
  58         struct pci_dev *pdev = to_pci_dev(dev);
  59         ssize_t consumed = -EINVAL;
  60
  61         if ((count > 0) && (*buf == '0' || *buf == '1')) {
  62                 pdev->broken_parity_status = *buf == '1' ? 1 : 0;
  63                 consumed = count;
  64         }
  65         return consumed;
  66 }
  67
  68 static ssize_t local_cpus_show(struct device *dev,
  69                         struct device_attribute *attr, char *buf)
  70 {
  71         cpumask_t mask;
  72         int len;
  73
  74         mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
  75         len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  76         strcat(buf,"\n");
  77         return 1+len;
  78 }
  79
  80 /* show resources */
  81 static ssize_t
  82 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
  83 {
  84         struct pci_dev * pci_dev = to_pci_dev(dev);
  85         char * str = buf;
  86         int i;
  87         int max = 7;
  88         resource_size_t start, end;
  89
  90         if (pci_dev->subordinate)
  91                 max = DEVICE_COUNT_RESOURCE;
  92
  93         for (i = 0; i < max; i++) {
  94                 struct resource *res =  &pci_dev->resource[i];
  95                 pci_resource_to_user(pci_dev, i, res, &start, &end);
  96                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
  97                                (unsigned long long)start,
  98                                (unsigned long long)end,
  99                                (unsigned long long)res->flags);
 100         }
 101         return (str - buf);
 102 }
 103
 104 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 105 {
 106         struct pci_dev *pci_dev = to_pci_dev(dev);
 107
 108         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 109                        pci_dev->vendor, pci_dev->device,
 110                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 111                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 112                        (u8)(pci_dev->class));
 113 }
 114
 115 static ssize_t is_enabled_store(struct device *dev,
 116                                 struct device_attribute *attr, const char *buf,
 117                                 size_t count)
 118 {
 119         ssize_t result = -EINVAL;
 120         struct pci_dev *pdev = to_pci_dev(dev);
 121
 122         /* this can crash the machine when done on the "wrong" device */
 123         if (!capable(CAP_SYS_ADMIN))
 124                 return count;
 125
 126         if (*buf == '0') {
 127                 if (atomic_read(&pdev->enable_cnt) != 0)
 128                         pci_disable_device(pdev);
 129                 else
 130                         result = -EIO;
 131         } else if (*buf == '1')
 132                 result = pci_enable_device(pdev);
 133
 134         return result < 0 ? result : count;
 135 }
 136
 137 static ssize_t is_enabled_show(struct device *dev,
 138                                struct device_attribute *attr, char *buf)
 139 {
 140         struct pci_dev *pdev;
 141
 142         pdev = to_pci_dev (dev);
 143         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 144 }
 145
 146 #ifdef CONFIG_NUMA
 147 static ssize_t
 148 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 149 {
 150         return sprintf (buf, "%d\n", dev->numa_node);
 151 }
 152 #endif
 153
 154 static ssize_t
 155 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 156 {
 157         struct pci_dev *pdev = to_pci_dev(dev);
 158
 159         if (!pdev->subordinate)
 160                 return 0;
 161
 162         return sprintf (buf, "%u\n",
 163                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 164 }
 165
 166 static ssize_t
 167 msi_bus_store(struct device *dev, struct device_attribute *attr,
 168               const char *buf, size_t count)
 169 {
 170         struct pci_dev *pdev = to_pci_dev(dev);
 171
 172         /* bad things may happen if the no_msi flag is changed
 173          * while some drivers are loaded */
 174         if (!capable(CAP_SYS_ADMIN))
 175                 return count;
 176
 177         if (!pdev->subordinate)
 178                 return count;
 179
 180         if (*buf == '0') {
 181                 pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 182                 dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
 183                          " bad things could happen.\n");
 184         }
 185
 186         if (*buf == '1') {
 187                 pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
 188                 dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
 189                          " bad things could happen.\n");
 190         }
 191
 192         return count;
 193 }
 194
 195 struct device_attribute pci_dev_attrs[] = {
 196         __ATTR_RO(resource),
 197         __ATTR_RO(vendor),
 198         __ATTR_RO(device),
 199         __ATTR_RO(subsystem_vendor),
 200         __ATTR_RO(subsystem_device),
 201         __ATTR_RO(class),
 202         __ATTR_RO(irq),
 203         __ATTR_RO(local_cpus),
 204         __ATTR_RO(modalias),
 205 #ifdef CONFIG_NUMA
 206         __ATTR_RO(numa_node),
 207 #endif
 208         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 209         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 210                 broken_parity_status_show,broken_parity_status_store),
 211         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 212         __ATTR_NULL,
 213 };
 214
 215 static ssize_t
 216 pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 217 {
 218         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 219         unsigned int size = 64;
 220         loff_t init_off = off;
 221         u8 *data = (u8*) buf;
 222
 223         /* Several chips lock up trying to read undefined config space */
 224         if (capable(CAP_SYS_ADMIN)) {
 225                 size = dev->cfg_size;
 226         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 227                 size = 128;
 228         }
 229
 230         if (off > size)
 231                 return 0;
 232         if (off + count > size) {
 233                 size -= off;
 234                 count = size;
 235         } else {
 236                 size = count;
 237         }
 238
 239         if ((off & 1) && size) {
 240                 u8 val;
 241                 pci_user_read_config_byte(dev, off, &val);
 242                 data[off - init_off] = val;
 243                 off++;
 244                 size--;
 245         }
 246
 247         if ((off & 3) && size > 2) {
 248                 u16 val;
 249                 pci_user_read_config_word(dev, off, &val);
 250                 data[off - init_off] = val & 0xff;
 251                 data[off - init_off + 1] = (val >> 8) & 0xff;
 252                 off += 2;
 253                 size -= 2;
 254         }
 255
 256         while (size > 3) {
 257                 u32 val;
 258                 pci_user_read_config_dword(dev, off, &val);
 259                 data[off - init_off] = val & 0xff;
 260                 data[off - init_off + 1] = (val >> 8) & 0xff;
 261                 data[off - init_off + 2] = (val >> 16) & 0xff;
 262                 data[off - init_off + 3] = (val >> 24) & 0xff;
 263                 off += 4;
 264                 size -= 4;
 265         }
 266
 267         if (size >= 2) {
 268                 u16 val;
 269                 pci_user_read_config_word(dev, off, &val);
 270                 data[off - init_off] = val & 0xff;
 271                 data[off - init_off + 1] = (val >> 8) & 0xff;
 272                 off += 2;
 273                 size -= 2;
 274         }
 275
 276         if (size > 0) {
 277                 u8 val;
 278                 pci_user_read_config_byte(dev, off, &val);
 279                 data[off - init_off] = val;
 280                 off++;
 281                 --size;
 282         }
 283
 284         return count;
 285 }
 286
 287 static ssize_t
 288 pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 289 {
 290         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 291         unsigned int size = count;
 292         loff_t init_off = off;
 293         u8 *data = (u8*) buf;
 294
 295         if (off > dev->cfg_size)
 296                 return 0;
 297         if (off + count > dev->cfg_size) {
 298                 size = dev->cfg_size - off;
 299                 count = size;
 300         }
 301
 302         if ((off & 1) && size) {
 303                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 304                 off++;
 305                 size--;
 306         }
 307
 308         if ((off & 3) && size > 2) {
 309                 u16 val = data[off - init_off];
 310                 val |= (u16) data[off - init_off + 1] << 8;
 311                 pci_user_write_config_word(dev, off, val);
 312                 off += 2;
 313                 size -= 2;
 314         }
 315
 316         while (size > 3) {
 317                 u32 val = data[off - init_off];
 318                 val |= (u32) data[off - init_off + 1] << 8;
 319                 val |= (u32) data[off - init_off + 2] << 16;
 320                 val |= (u32) data[off - init_off + 3] << 24;
 321                 pci_user_write_config_dword(dev, off, val);
 322                 off += 4;
 323                 size -= 4;
 324         }
 325
 326         if (size >= 2) {
 327                 u16 val = data[off - init_off];
 328                 val |= (u16) data[off - init_off + 1] << 8;
 329                 pci_user_write_config_word(dev, off, val);
 330                 off += 2;
 331                 size -= 2;
 332         }
 333
 334         if (size) {
 335                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 336                 off++;
 337                 --size;
 338         }
 339
 340         return count;
 341 }
 342
 343 #ifdef HAVE_PCI_LEGACY
 344 /**
 345  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 346  * @kobj: kobject corresponding to file to read from
 347  * @buf: buffer to store results
 348  * @off: offset into legacy I/O port space
 349  * @count: number of bytes to read
 350  *
 351  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 352  * callback routine (pci_legacy_read).
 353  */
 354 ssize_t
 355 pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
 356 {
 357         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 358                                                       struct class_device,
 359                                                       kobj));
 360
 361         /* Only support 1, 2 or 4 byte accesses */
 362         if (count != 1 && count != 2 && count != 4)
 363                 return -EINVAL;
 364
 365         return pci_legacy_read(bus, off, (u32 *)buf, count);
 366 }
 367
 368 /**
 369  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 370  * @kobj: kobject corresponding to file to read from
 371  * @buf: buffer containing value to be written
 372  * @off: offset into legacy I/O port space
 373  * @count: number of bytes to write
 374  *
 375  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 376  * callback routine (pci_legacy_write).
 377  */
 378 ssize_t
 379 pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
 380 {
 381         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 382                                                       struct class_device,
 383                                                       kobj));
 384         /* Only support 1, 2 or 4 byte accesses */
 385         if (count != 1 && count != 2 && count != 4)
 386                 return -EINVAL;
 387
 388         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 389 }
 390
 391 /**
 392  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 393  * @kobj: kobject corresponding to device to be mapped
 394  * @attr: struct bin_attribute for this file
 395  * @vma: struct vm_area_struct passed to mmap
 396  *
 397  * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
 398  * legacy memory space (first meg of bus space) into application virtual
 399  * memory space.
 400  */
 401 int
 402 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 403                     struct vm_area_struct *vma)
 404 {
 405         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 406                                                       struct class_device,
 407                                                       kobj));
 408
 409         return pci_mmap_legacy_page_range(bus, vma);
 410 }
 411 #endif /* HAVE_PCI_LEGACY */
 412
 413 #ifdef HAVE_PCI_MMAP
 414 /**
 415  * pci_mmap_resource - map a PCI resource into user memory space
 416  * @kobj: kobject for mapping
 417  * @attr: struct bin_attribute for the file being mapped
 418  * @vma: struct vm_area_struct passed into the mmap
 419  *
 420  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 421  * FIXME: write combining?  maybe automatic for prefetchable regions?
 422  */
 423 static int
 424 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 425                   struct vm_area_struct *vma)
 426 {
 427         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 428                                                        struct device, kobj));
 429         struct resource *res = (struct resource *)attr->private;
 430         enum pci_mmap_state mmap_type;
 431         resource_size_t start, end;
 432         int i;
 433
 434         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 435                 if (res == &pdev->resource[i])
 436                         break;
 437         if (i >= PCI_ROM_RESOURCE)
 438                 return -ENODEV;
 439
 440         /* pci_mmap_page_range() expects the same kind of entry as coming
 441          * from /proc/bus/pci/ which is a "user visible" value. If this is
 442          * different from the resource itself, arch will do necessary fixup.
 443          */
 444         pci_resource_to_user(pdev, i, res, &start, &end);
 445         vma->vm_pgoff += start >> PAGE_SHIFT;
 446         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 447
 448         return pci_mmap_page_range(pdev, vma, mmap_type, 0);
 449 }
 450
 451 /**
 452  * pci_remove_resource_files - cleanup resource files
 453  * @dev: dev to cleanup
 454  *
 455  * If we created resource files for @dev, remove them from sysfs and
 456  * free their resources.
 457  */
 458 static void
 459 pci_remove_resource_files(struct pci_dev *pdev)
 460 {
 461         int i;
 462
 463         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 464                 struct bin_attribute *res_attr;
 465
 466                 res_attr = pdev->res_attr[i];
 467                 if (res_attr) {
 468                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 469                         kfree(res_attr);
 470                 }
 471         }
 472 }
 473
 474 /**
 475  * pci_create_resource_files - create resource files in sysfs for @dev
 476  * @dev: dev in question
 477  *
 478  * Walk the resources in @dev creating files for each resource available.
 479  */
 480 static int pci_create_resource_files(struct pci_dev *pdev)
 481 {
 482         int i;
 483         int retval;
 484
 485         /* Expose the PCI resources from this device as files */
 486         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 487                 struct bin_attribute *res_attr;
 488
 489                 /* skip empty resources */
 490                 if (!pci_resource_len(pdev, i))
 491                         continue;
 492
 493                 /* allocate attribute structure, piggyback attribute name */
 494                 res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
 495                 if (res_attr) {
 496                         char *res_attr_name = (char *)(res_attr + 1);
 497
 498                         pdev->res_attr[i] = res_attr;
 499                         sprintf(res_attr_name, "resource%d", i);
 500                         res_attr->attr.name = res_attr_name;
 501                         res_attr->attr.mode = S_IRUSR | S_IWUSR;
 502                         res_attr->attr.owner = THIS_MODULE;
 503                         res_attr->size = pci_resource_len(pdev, i);
 504                         res_attr->mmap = pci_mmap_resource;
 505                         res_attr->private = &pdev->resource[i];
 506                         retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 507                         if (retval) {
 508                                 pci_remove_resource_files(pdev);
 509                                 return retval;
 510                         }
 511                 } else {
 512                         return -ENOMEM;
 513                 }
 514         }
 515         return 0;
 516 }
 517 #else /* !HAVE_PCI_MMAP */
 518 static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
 519 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
 520 #endif /* HAVE_PCI_MMAP */
 521
 522 /**
 523  * pci_write_rom - used to enable access to the PCI ROM display
 524  * @kobj: kernel object handle
 525  * @buf: user input
 526  * @off: file offset
 527  * @count: number of byte in input
 528  *
 529  * writing anything except 0 enables it
 530  */
 531 static ssize_t
 532 pci_write_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
 533 {
 534         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 535
 536         if ((off ==  0) && (*buf == '0') && (count == 2))
 537                 pdev->rom_attr_enabled = 0;
 538         else
 539                 pdev->rom_attr_enabled = 1;
 540
 541         return count;
 542 }
 543
 544 /**
 545  * pci_read_rom - read a PCI ROM
 546  * @kobj: kernel object handle
 547  * @buf: where to put the data we read from the ROM
 548  * @off: file offset
 549  * @count: number of bytes to read
 550  *
 551  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 552  * device corresponding to @kobj.
 553  */
 554 static ssize_t
 555 pci_read_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
 556 {
 557         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 558         void __iomem *rom;
 559         size_t size;
 560
 561         if (!pdev->rom_attr_enabled)
 562                 return -EINVAL;
 563
 564         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 565         if (!rom)
 566                 return 0;
 567
 568         if (off >= size)
 569                 count = 0;
 570         else {
 571                 if (off + count > size)
 572                         count = size - off;
 573
 574                 memcpy_fromio(buf, rom + off, count);
 575         }
 576         pci_unmap_rom(pdev, rom);
 577
 578         return count;
 579 }
 580
 581 static struct bin_attribute pci_config_attr = {
 582         .attr = {
 583                 .name = "config",
 584                 .mode = S_IRUGO | S_IWUSR,
 585                 .owner = THIS_MODULE,
 586         },
 587         .size = 256,
 588         .read = pci_read_config,
 589         .write = pci_write_config,
 590 };
 591
 592 static struct bin_attribute pcie_config_attr = {
 593         .attr = {
 594                 .name = "config",
 595                 .mode = S_IRUGO | S_IWUSR,
 596                 .owner = THIS_MODULE,
 597         },
 598         .size = 4096,
 599         .read = pci_read_config,
 600         .write = pci_write_config,
 601 };
 602
 603 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 604 {
 605         struct bin_attribute *rom_attr = NULL;
 606         int retval;
 607
 608         if (!sysfs_initialized)
 609                 return -EACCES;
 610
 611         if (pdev->cfg_size < 4096)
 612                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 613         else
 614                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 615         if (retval)
 616                 goto err;
 617
 618         retval = pci_create_resource_files(pdev);
 619         if (retval)
 620                 goto err_bin_file;
 621
 622         /* If the device has a ROM, try to expose it in sysfs. */
 623         if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 624                 rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC);
 625                 if (rom_attr) {
 626                         pdev->rom_attr = rom_attr;
 627                         rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 628                         rom_attr->attr.name = "rom";
 629                         rom_attr->attr.mode = S_IRUSR;
 630                         rom_attr->attr.owner = THIS_MODULE;
 631                         rom_attr->read = pci_read_rom;
 632                         rom_attr->write = pci_write_rom;
 633                         retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
 634                         if (retval)
 635                                 goto err_rom;
 636                 } else {
 637                         retval = -ENOMEM;
 638                         goto err_bin_file;
 639                 }
 640         }
 641         /* add platform-specific attributes */
 642         pcibios_add_platform_entries(pdev);
 643
 644         return 0;
 645
 646 err_rom:
 647         kfree(rom_attr);
 648 err_bin_file:
 649         if (pdev->cfg_size < 4096)
 650                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 651         else
 652                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 653 err:
 654         return retval;
 655 }
 656
 657 /**
 658  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
 659  * @pdev: device whose entries we should free
 660  *
 661  * Cleanup when @pdev is removed from sysfs.
 662  */
 663 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 664 {
 665         if (!sysfs_initialized)
 666                 return;
 667
 668         if (pdev->cfg_size < 4096)
 669                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 670         else
 671                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 672
 673         pci_remove_resource_files(pdev);
 674
 675         if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 676                 if (pdev->rom_attr) {
 677                         sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 678                         kfree(pdev->rom_attr);
 679                 }
 680         }
 681 }
 682
 683 static int __init pci_sysfs_init(void)
 684 {
 685         struct pci_dev *pdev = NULL;
 686         int retval;
 687
 688         sysfs_initialized = 1;
 689         for_each_pci_dev(pdev) {
 690                 retval = pci_create_sysfs_dev_files(pdev);
 691                 if (retval)
 692                         return retval;
 693         }
 694
 695         return 0;
 696 }
 697
 698 __initcall(pci_sysfs_init);