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