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/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 "pci.h"
  33
  34 static int sysfs_initialized;   /* = 0 */
  35
  36 /* show configuration fields */
  37 #define pci_config_attr(field, format_string)                           \
  38 static ssize_t                                                          \
  39 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  40 {                                                                       \
  41         struct pci_dev *pdev;                                           \
  42                                                                         \
  43         pdev = to_pci_dev (dev);                                        \
  44         return sprintf (buf, format_string, pdev->field);               \
  45 }
  46
  47 pci_config_attr(vendor, "0x%04x\n");
  48 pci_config_attr(device, "0x%04x\n");
  49 pci_config_attr(subsystem_vendor, "0x%04x\n");
  50 pci_config_attr(subsystem_device, "0x%04x\n");
  51 pci_config_attr(class, "0x%06x\n");
  52 pci_config_attr(irq, "%u\n");
  53
  54 static ssize_t broken_parity_status_show(struct device *dev,
  55                                          struct device_attribute *attr,
  56                                          char *buf)
  57 {
  58         struct pci_dev *pdev = to_pci_dev(dev);
  59         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  60 }
  61
  62 static ssize_t broken_parity_status_store(struct device *dev,
  63                                           struct device_attribute *attr,
  64                                           const char *buf, size_t count)
  65 {
  66         struct pci_dev *pdev = to_pci_dev(dev);
  67         unsigned long val;
  68
  69         if (strict_strtoul(buf, 0, &val) < 0)
  70                 return -EINVAL;
  71
  72         pdev->broken_parity_status = !!val;
  73
  74         return count;
  75 }
  76
  77 static ssize_t local_cpus_show(struct device *dev,
  78                         struct device_attribute *attr, char *buf)
  79 {
  80         const struct cpumask *mask;
  81         int len;
  82
  83 #ifdef CONFIG_NUMA
  84         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  85                                           cpumask_of_node(dev_to_node(dev));
  86 #else
  87         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  88 #endif
  89         len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  90         buf[len++] = '\n';
  91         buf[len] = '\0';
  92         return len;
  93 }
  94
  95
  96 static ssize_t local_cpulist_show(struct device *dev,
  97                         struct device_attribute *attr, char *buf)
  98 {
  99         const struct cpumask *mask;
 100         int len;
 101
 102 #ifdef CONFIG_NUMA
 103         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
 104                                           cpumask_of_node(dev_to_node(dev));
 105 #else
 106         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
 107 #endif
 108         len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
 109         buf[len++] = '\n';
 110         buf[len] = '\0';
 111         return len;
 112 }
 113
 114 /*
 115  * PCI Bus Class Devices
 116  */
 117 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
 118                                         int type,
 119                                         struct device_attribute *attr,
 120                                         char *buf)
 121 {
 122         int ret;
 123         const struct cpumask *cpumask;
 124
 125         cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 126         ret = type ?
 127                 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
 128                 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
 129         buf[ret++] = '\n';
 130         buf[ret] = '\0';
 131         return ret;
 132 }
 133
 134 static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
 135                                         struct device_attribute *attr,
 136                                         char *buf)
 137 {
 138         return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
 139 }
 140
 141 static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
 142                                         struct device_attribute *attr,
 143                                         char *buf)
 144 {
 145         return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
 146 }
 147
 148 /* show resources */
 149 static ssize_t
 150 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 151 {
 152         struct pci_dev * pci_dev = to_pci_dev(dev);
 153         char * str = buf;
 154         int i;
 155         int max;
 156         resource_size_t start, end;
 157
 158         if (pci_dev->subordinate)
 159                 max = DEVICE_COUNT_RESOURCE;
 160         else
 161                 max = PCI_BRIDGE_RESOURCES;
 162
 163         for (i = 0; i < max; i++) {
 164                 struct resource *res =  &pci_dev->resource[i];
 165                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 166                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 167                                (unsigned long long)start,
 168                                (unsigned long long)end,
 169                                (unsigned long long)res->flags);
 170         }
 171         return (str - buf);
 172 }
 173
 174 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 175 {
 176         struct pci_dev *pci_dev = to_pci_dev(dev);
 177
 178         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 179                        pci_dev->vendor, pci_dev->device,
 180                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 181                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 182                        (u8)(pci_dev->class));
 183 }
 184
 185 static ssize_t is_enabled_store(struct device *dev,
 186                                 struct device_attribute *attr, const char *buf,
 187                                 size_t count)
 188 {
 189         struct pci_dev *pdev = to_pci_dev(dev);
 190         unsigned long val;
 191         ssize_t result = strict_strtoul(buf, 0, &val);
 192
 193         if (result < 0)
 194                 return result;
 195
 196         /* this can crash the machine when done on the "wrong" device */
 197         if (!capable(CAP_SYS_ADMIN))
 198                 return -EPERM;
 199
 200         if (!val) {
 201                 if (pci_is_enabled(pdev))
 202                         pci_disable_device(pdev);
 203                 else
 204                         result = -EIO;
 205         } else
 206                 result = pci_enable_device(pdev);
 207
 208         return result < 0 ? result : count;
 209 }
 210
 211 static ssize_t is_enabled_show(struct device *dev,
 212                                struct device_attribute *attr, char *buf)
 213 {
 214         struct pci_dev *pdev;
 215
 216         pdev = to_pci_dev (dev);
 217         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 218 }
 219
 220 #ifdef CONFIG_NUMA
 221 static ssize_t
 222 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         return sprintf (buf, "%d\n", dev->numa_node);
 225 }
 226 #endif
 227
 228 static ssize_t
 229 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
 230 {
 231         struct pci_dev *pdev = to_pci_dev(dev);
 232
 233         return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
 234 }
 235
 236 static ssize_t
 237 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
 238                                  char *buf)
 239 {
 240         return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
 241 }
 242
 243 static ssize_t
 244 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 245 {
 246         struct pci_dev *pdev = to_pci_dev(dev);
 247
 248         if (!pdev->subordinate)
 249                 return 0;
 250
 251         return sprintf (buf, "%u\n",
 252                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 253 }
 254
 255 static ssize_t
 256 msi_bus_store(struct device *dev, struct device_attribute *attr,
 257               const char *buf, size_t count)
 258 {
 259         struct pci_dev *pdev = to_pci_dev(dev);
 260         unsigned long val;
 261
 262         if (strict_strtoul(buf, 0, &val) < 0)
 263                 return -EINVAL;
 264
 265         /* bad things may happen if the no_msi flag is changed
 266          * while some drivers are loaded */
 267         if (!capable(CAP_SYS_ADMIN))
 268                 return -EPERM;
 269
 270         /* Maybe pci devices without subordinate busses shouldn't even have this
 271          * attribute in the first place?  */
 272         if (!pdev->subordinate)
 273                 return count;
 274
 275         /* Is the flag going to change, or keep the value it already had? */
 276         if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 277             !!val) {
 278                 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 279
 280                 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 281                          " bad things could happen\n", val ? "" : " not");
 282         }
 283
 284         return count;
 285 }
 286
 287 #ifdef CONFIG_HOTPLUG
 288 static DEFINE_MUTEX(pci_remove_rescan_mutex);
 289 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 290                                 size_t count)
 291 {
 292         unsigned long val;
 293         struct pci_bus *b = NULL;
 294
 295         if (strict_strtoul(buf, 0, &val) < 0)
 296                 return -EINVAL;
 297
 298         if (val) {
 299                 mutex_lock(&pci_remove_rescan_mutex);
 300                 while ((b = pci_find_next_bus(b)) != NULL)
 301                         pci_rescan_bus(b);
 302                 mutex_unlock(&pci_remove_rescan_mutex);
 303         }
 304         return count;
 305 }
 306
 307 struct bus_attribute pci_bus_attrs[] = {
 308         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
 309         __ATTR_NULL
 310 };
 311
 312 static ssize_t
 313 dev_rescan_store(struct device *dev, struct device_attribute *attr,
 314                  const char *buf, size_t count)
 315 {
 316         unsigned long val;
 317         struct pci_dev *pdev = to_pci_dev(dev);
 318
 319         if (strict_strtoul(buf, 0, &val) < 0)
 320                 return -EINVAL;
 321
 322         if (val) {
 323                 mutex_lock(&pci_remove_rescan_mutex);
 324                 pci_rescan_bus(pdev->bus);
 325                 mutex_unlock(&pci_remove_rescan_mutex);
 326         }
 327         return count;
 328 }
 329
 330 static void remove_callback(struct device *dev)
 331 {
 332         struct pci_dev *pdev = to_pci_dev(dev);
 333
 334         mutex_lock(&pci_remove_rescan_mutex);
 335         pci_stop_and_remove_bus_device(pdev);
 336         mutex_unlock(&pci_remove_rescan_mutex);
 337 }
 338
 339 static ssize_t
 340 remove_store(struct device *dev, struct device_attribute *dummy,
 341              const char *buf, size_t count)
 342 {
 343         int ret = 0;
 344         unsigned long val;
 345
 346         if (strict_strtoul(buf, 0, &val) < 0)
 347                 return -EINVAL;
 348
 349         /* An attribute cannot be unregistered by one of its own methods,
 350          * so we have to use this roundabout approach.
 351          */
 352         if (val)
 353                 ret = device_schedule_callback(dev, remove_callback);
 354         if (ret)
 355                 count = ret;
 356         return count;
 357 }
 358
 359 static ssize_t
 360 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 361                  const char *buf, size_t count)
 362 {
 363         unsigned long val;
 364         struct pci_bus *bus = to_pci_bus(dev);
 365
 366         if (strict_strtoul(buf, 0, &val) < 0)
 367                 return -EINVAL;
 368
 369         if (val) {
 370                 mutex_lock(&pci_remove_rescan_mutex);
 371                 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
 372                         pci_rescan_bus_bridge_resize(bus->self);
 373                 else
 374                         pci_rescan_bus(bus);
 375                 mutex_unlock(&pci_remove_rescan_mutex);
 376         }
 377         return count;
 378 }
 379
 380 #endif
 381
 382 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 383 static ssize_t d3cold_allowed_store(struct device *dev,
 384                                     struct device_attribute *attr,
 385                                     const char *buf, size_t count)
 386 {
 387         struct pci_dev *pdev = to_pci_dev(dev);
 388         unsigned long val;
 389
 390         if (strict_strtoul(buf, 0, &val) < 0)
 391                 return -EINVAL;
 392
 393         pdev->d3cold_allowed = !!val;
 394         pm_runtime_resume(dev);
 395
 396         return count;
 397 }
 398
 399 static ssize_t d3cold_allowed_show(struct device *dev,
 400                                    struct device_attribute *attr, char *buf)
 401 {
 402         struct pci_dev *pdev = to_pci_dev(dev);
 403         return sprintf (buf, "%u\n", pdev->d3cold_allowed);
 404 }
 405 #endif
 406
 407 struct device_attribute pci_dev_attrs[] = {
 408         __ATTR_RO(resource),
 409         __ATTR_RO(vendor),
 410         __ATTR_RO(device),
 411         __ATTR_RO(subsystem_vendor),
 412         __ATTR_RO(subsystem_device),
 413         __ATTR_RO(class),
 414         __ATTR_RO(irq),
 415         __ATTR_RO(local_cpus),
 416         __ATTR_RO(local_cpulist),
 417         __ATTR_RO(modalias),
 418 #ifdef CONFIG_NUMA
 419         __ATTR_RO(numa_node),
 420 #endif
 421         __ATTR_RO(dma_mask_bits),
 422         __ATTR_RO(consistent_dma_mask_bits),
 423         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 424         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 425                 broken_parity_status_show,broken_parity_status_store),
 426         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 427 #ifdef CONFIG_HOTPLUG
 428         __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
 429         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
 430 #endif
 431 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 432         __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
 433 #endif
 434         __ATTR_NULL,
 435 };
 436
 437 struct device_attribute pcibus_dev_attrs[] = {
 438 #ifdef CONFIG_HOTPLUG
 439         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
 440 #endif
 441         __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
 442         __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
 443         __ATTR_NULL,
 444 };
 445
 446 static ssize_t
 447 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 448 {
 449         struct pci_dev *pdev = to_pci_dev(dev);
 450         struct pci_dev *vga_dev = vga_default_device();
 451
 452         if (vga_dev)
 453                 return sprintf(buf, "%u\n", (pdev == vga_dev));
 454
 455         return sprintf(buf, "%u\n",
 456                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 457                    IORESOURCE_ROM_SHADOW));
 458 }
 459 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 460
 461 static ssize_t
 462 pci_read_config(struct file *filp, struct kobject *kobj,
 463                 struct bin_attribute *bin_attr,
 464                 char *buf, loff_t off, size_t count)
 465 {
 466         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 467         unsigned int size = 64;
 468         loff_t init_off = off;
 469         u8 *data = (u8*) buf;
 470
 471         /* Several chips lock up trying to read undefined config space */
 472         if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
 473                 size = dev->cfg_size;
 474         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 475                 size = 128;
 476         }
 477
 478         if (off > size)
 479                 return 0;
 480         if (off + count > size) {
 481                 size -= off;
 482                 count = size;
 483         } else {
 484                 size = count;
 485         }
 486
 487         pci_config_pm_runtime_get(dev);
 488
 489         if ((off & 1) && size) {
 490                 u8 val;
 491                 pci_user_read_config_byte(dev, off, &val);
 492                 data[off - init_off] = val;
 493                 off++;
 494                 size--;
 495         }
 496
 497         if ((off & 3) && size > 2) {
 498                 u16 val;
 499                 pci_user_read_config_word(dev, off, &val);
 500                 data[off - init_off] = val & 0xff;
 501                 data[off - init_off + 1] = (val >> 8) & 0xff;
 502                 off += 2;
 503                 size -= 2;
 504         }
 505
 506         while (size > 3) {
 507                 u32 val;
 508                 pci_user_read_config_dword(dev, off, &val);
 509                 data[off - init_off] = val & 0xff;
 510                 data[off - init_off + 1] = (val >> 8) & 0xff;
 511                 data[off - init_off + 2] = (val >> 16) & 0xff;
 512                 data[off - init_off + 3] = (val >> 24) & 0xff;
 513                 off += 4;
 514                 size -= 4;
 515         }
 516
 517         if (size >= 2) {
 518                 u16 val;
 519                 pci_user_read_config_word(dev, off, &val);
 520                 data[off - init_off] = val & 0xff;
 521                 data[off - init_off + 1] = (val >> 8) & 0xff;
 522                 off += 2;
 523                 size -= 2;
 524         }
 525
 526         if (size > 0) {
 527                 u8 val;
 528                 pci_user_read_config_byte(dev, off, &val);
 529                 data[off - init_off] = val;
 530                 off++;
 531                 --size;
 532         }
 533
 534         pci_config_pm_runtime_put(dev);
 535
 536         return count;
 537 }
 538
 539 static ssize_t
 540 pci_write_config(struct file* filp, struct kobject *kobj,
 541                  struct bin_attribute *bin_attr,
 542                  char *buf, loff_t off, size_t count)
 543 {
 544         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 545         unsigned int size = count;
 546         loff_t init_off = off;
 547         u8 *data = (u8*) buf;
 548
 549         if (off > dev->cfg_size)
 550                 return 0;
 551         if (off + count > dev->cfg_size) {
 552                 size = dev->cfg_size - off;
 553                 count = size;
 554         }
 555
 556         pci_config_pm_runtime_get(dev);
 557
 558         if ((off & 1) && size) {
 559                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 560                 off++;
 561                 size--;
 562         }
 563
 564         if ((off & 3) && size > 2) {
 565                 u16 val = data[off - init_off];
 566                 val |= (u16) data[off - init_off + 1] << 8;
 567                 pci_user_write_config_word(dev, off, val);
 568                 off += 2;
 569                 size -= 2;
 570         }
 571
 572         while (size > 3) {
 573                 u32 val = data[off - init_off];
 574                 val |= (u32) data[off - init_off + 1] << 8;
 575                 val |= (u32) data[off - init_off + 2] << 16;
 576                 val |= (u32) data[off - init_off + 3] << 24;
 577                 pci_user_write_config_dword(dev, off, val);
 578                 off += 4;
 579                 size -= 4;
 580         }
 581
 582         if (size >= 2) {
 583                 u16 val = data[off - init_off];
 584                 val |= (u16) data[off - init_off + 1] << 8;
 585                 pci_user_write_config_word(dev, off, val);
 586                 off += 2;
 587                 size -= 2;
 588         }
 589
 590         if (size) {
 591                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 592                 off++;
 593                 --size;
 594         }
 595
 596         pci_config_pm_runtime_put(dev);
 597
 598         return count;
 599 }
 600
 601 static ssize_t
 602 read_vpd_attr(struct file *filp, struct kobject *kobj,
 603               struct bin_attribute *bin_attr,
 604               char *buf, loff_t off, size_t count)
 605 {
 606         struct pci_dev *dev =
 607                 to_pci_dev(container_of(kobj, struct device, kobj));
 608
 609         if (off > bin_attr->size)
 610                 count = 0;
 611         else if (count > bin_attr->size - off)
 612                 count = bin_attr->size - off;
 613
 614         return pci_read_vpd(dev, off, count, buf);
 615 }
 616
 617 static ssize_t
 618 write_vpd_attr(struct file *filp, struct kobject *kobj,
 619                struct bin_attribute *bin_attr,
 620                char *buf, loff_t off, size_t count)
 621 {
 622         struct pci_dev *dev =
 623                 to_pci_dev(container_of(kobj, struct device, kobj));
 624
 625         if (off > bin_attr->size)
 626                 count = 0;
 627         else if (count > bin_attr->size - off)
 628                 count = bin_attr->size - off;
 629
 630         return pci_write_vpd(dev, off, count, buf);
 631 }
 632
 633 #ifdef HAVE_PCI_LEGACY
 634 /**
 635  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 636  * @filp: open sysfs file
 637  * @kobj: kobject corresponding to file to read from
 638  * @bin_attr: struct bin_attribute for this file
 639  * @buf: buffer to store results
 640  * @off: offset into legacy I/O port space
 641  * @count: number of bytes to read
 642  *
 643  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 644  * callback routine (pci_legacy_read).
 645  */
 646 static ssize_t
 647 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 648                    struct bin_attribute *bin_attr,
 649                    char *buf, loff_t off, size_t count)
 650 {
 651         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 652                                                       struct device,
 653                                                       kobj));
 654
 655         /* Only support 1, 2 or 4 byte accesses */
 656         if (count != 1 && count != 2 && count != 4)
 657                 return -EINVAL;
 658
 659         return pci_legacy_read(bus, off, (u32 *)buf, count);
 660 }
 661
 662 /**
 663  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 664  * @filp: open sysfs file
 665  * @kobj: kobject corresponding to file to read from
 666  * @bin_attr: struct bin_attribute for this file
 667  * @buf: buffer containing value to be written
 668  * @off: offset into legacy I/O port space
 669  * @count: number of bytes to write
 670  *
 671  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 672  * callback routine (pci_legacy_write).
 673  */
 674 static ssize_t
 675 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 676                     struct bin_attribute *bin_attr,
 677                     char *buf, loff_t off, size_t count)
 678 {
 679         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 680                                                       struct device,
 681                                                       kobj));
 682         /* Only support 1, 2 or 4 byte accesses */
 683         if (count != 1 && count != 2 && count != 4)
 684                 return -EINVAL;
 685
 686         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 687 }
 688
 689 /**
 690  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 691  * @filp: open sysfs file
 692  * @kobj: kobject corresponding to device to be mapped
 693  * @attr: struct bin_attribute for this file
 694  * @vma: struct vm_area_struct passed to mmap
 695  *
 696  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 697  * legacy memory space (first meg of bus space) into application virtual
 698  * memory space.
 699  */
 700 static int
 701 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 702                     struct bin_attribute *attr,
 703                     struct vm_area_struct *vma)
 704 {
 705         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 706                                                       struct device,
 707                                                       kobj));
 708
 709         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 710 }
 711
 712 /**
 713  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 714  * @filp: open sysfs file
 715  * @kobj: kobject corresponding to device to be mapped
 716  * @attr: struct bin_attribute for this file
 717  * @vma: struct vm_area_struct passed to mmap
 718  *
 719  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 720  * legacy IO space (first meg of bus space) into application virtual
 721  * memory space. Returns -ENOSYS if the operation isn't supported
 722  */
 723 static int
 724 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 725                    struct bin_attribute *attr,
 726                    struct vm_area_struct *vma)
 727 {
 728         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 729                                                       struct device,
 730                                                       kobj));
 731
 732         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 733 }
 734
 735 /**
 736  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 737  * @b: bus to create files under
 738  * @mmap_type: I/O port or memory
 739  *
 740  * Stub implementation. Can be overridden by arch if necessary.
 741  */
 742 void __weak
 743 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 744 {
 745         return;
 746 }
 747
 748 /**
 749  * pci_create_legacy_files - create legacy I/O port and memory files
 750  * @b: bus to create files under
 751  *
 752  * Some platforms allow access to legacy I/O port and ISA memory space on
 753  * a per-bus basis.  This routine creates the files and ties them into
 754  * their associated read, write and mmap files from pci-sysfs.c
 755  *
 756  * On error unwind, but don't propagate the error to the caller
 757  * as it is ok to set up the PCI bus without these files.
 758  */
 759 void pci_create_legacy_files(struct pci_bus *b)
 760 {
 761         int error;
 762
 763         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 764                                GFP_ATOMIC);
 765         if (!b->legacy_io)
 766                 goto kzalloc_err;
 767
 768         sysfs_bin_attr_init(b->legacy_io);
 769         b->legacy_io->attr.name = "legacy_io";
 770         b->legacy_io->size = 0xffff;
 771         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 772         b->legacy_io->read = pci_read_legacy_io;
 773         b->legacy_io->write = pci_write_legacy_io;
 774         b->legacy_io->mmap = pci_mmap_legacy_io;
 775         pci_adjust_legacy_attr(b, pci_mmap_io);
 776         error = device_create_bin_file(&b->dev, b->legacy_io);
 777         if (error)
 778                 goto legacy_io_err;
 779
 780         /* Allocated above after the legacy_io struct */
 781         b->legacy_mem = b->legacy_io + 1;
 782         sysfs_bin_attr_init(b->legacy_mem);
 783         b->legacy_mem->attr.name = "legacy_mem";
 784         b->legacy_mem->size = 1024*1024;
 785         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 786         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 787         pci_adjust_legacy_attr(b, pci_mmap_mem);
 788         error = device_create_bin_file(&b->dev, b->legacy_mem);
 789         if (error)
 790                 goto legacy_mem_err;
 791
 792         return;
 793
 794 legacy_mem_err:
 795         device_remove_bin_file(&b->dev, b->legacy_io);
 796 legacy_io_err:
 797         kfree(b->legacy_io);
 798         b->legacy_io = NULL;
 799 kzalloc_err:
 800         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 801                "and ISA memory resources to sysfs\n");
 802         return;
 803 }
 804
 805 void pci_remove_legacy_files(struct pci_bus *b)
 806 {
 807         if (b->legacy_io) {
 808                 device_remove_bin_file(&b->dev, b->legacy_io);
 809                 device_remove_bin_file(&b->dev, b->legacy_mem);
 810                 kfree(b->legacy_io); /* both are allocated here */
 811         }
 812 }
 813 #endif /* HAVE_PCI_LEGACY */
 814
 815 #ifdef HAVE_PCI_MMAP
 816
 817 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 818                   enum pci_mmap_api mmap_api)
 819 {
 820         unsigned long nr, start, size, pci_start;
 821
 822         if (pci_resource_len(pdev, resno) == 0)
 823                 return 0;
 824         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 825         start = vma->vm_pgoff;
 826         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 827         pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 828                         pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 829         if (start >= pci_start && start < pci_start + size &&
 830                         start + nr <= pci_start + size)
 831                 return 1;
 832         return 0;
 833 }
 834
 835 /**
 836  * pci_mmap_resource - map a PCI resource into user memory space
 837  * @kobj: kobject for mapping
 838  * @attr: struct bin_attribute for the file being mapped
 839  * @vma: struct vm_area_struct passed into the mmap
 840  * @write_combine: 1 for write_combine mapping
 841  *
 842  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 843  */
 844 static int
 845 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 846                   struct vm_area_struct *vma, int write_combine)
 847 {
 848         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 849                                                        struct device, kobj));
 850         struct resource *res = attr->private;
 851         enum pci_mmap_state mmap_type;
 852         resource_size_t start, end;
 853         int i;
 854
 855         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 856                 if (res == &pdev->resource[i])
 857                         break;
 858         if (i >= PCI_ROM_RESOURCE)
 859                 return -ENODEV;
 860
 861         if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
 862                 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
 863                         "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
 864                         current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
 865                         pci_name(pdev), i,
 866                         (u64)pci_resource_start(pdev, i),
 867                         (u64)pci_resource_len(pdev, i));
 868                 return -EINVAL;
 869         }
 870
 871         /* pci_mmap_page_range() expects the same kind of entry as coming
 872          * from /proc/bus/pci/ which is a "user visible" value. If this is
 873          * different from the resource itself, arch will do necessary fixup.
 874          */
 875         pci_resource_to_user(pdev, i, res, &start, &end);
 876         vma->vm_pgoff += start >> PAGE_SHIFT;
 877         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 878
 879         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 880                 return -EINVAL;
 881
 882         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 883 }
 884
 885 static int
 886 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
 887                      struct bin_attribute *attr,
 888                      struct vm_area_struct *vma)
 889 {
 890         return pci_mmap_resource(kobj, attr, vma, 0);
 891 }
 892
 893 static int
 894 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
 895                      struct bin_attribute *attr,
 896                      struct vm_area_struct *vma)
 897 {
 898         return pci_mmap_resource(kobj, attr, vma, 1);
 899 }
 900
 901 static ssize_t
 902 pci_resource_io(struct file *filp, struct kobject *kobj,
 903                 struct bin_attribute *attr, char *buf,
 904                 loff_t off, size_t count, bool write)
 905 {
 906         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 907                                                        struct device, kobj));
 908         struct resource *res = attr->private;
 909         unsigned long port = off;
 910         int i;
 911
 912         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 913                 if (res == &pdev->resource[i])
 914                         break;
 915         if (i >= PCI_ROM_RESOURCE)
 916                 return -ENODEV;
 917
 918         port += pci_resource_start(pdev, i);
 919
 920         if (port > pci_resource_end(pdev, i))
 921                 return 0;
 922
 923         if (port + count - 1 > pci_resource_end(pdev, i))
 924                 return -EINVAL;
 925
 926         switch (count) {
 927         case 1:
 928                 if (write)
 929                         outb(*(u8 *)buf, port);
 930                 else
 931                         *(u8 *)buf = inb(port);
 932                 return 1;
 933         case 2:
 934                 if (write)
 935                         outw(*(u16 *)buf, port);
 936                 else
 937                         *(u16 *)buf = inw(port);
 938                 return 2;
 939         case 4:
 940                 if (write)
 941                         outl(*(u32 *)buf, port);
 942                 else
 943                         *(u32 *)buf = inl(port);
 944                 return 4;
 945         }
 946         return -EINVAL;
 947 }
 948
 949 static ssize_t
 950 pci_read_resource_io(struct file *filp, struct kobject *kobj,
 951                      struct bin_attribute *attr, char *buf,
 952                      loff_t off, size_t count)
 953 {
 954         return pci_resource_io(filp, kobj, attr, buf, off, count, false);
 955 }
 956
 957 static ssize_t
 958 pci_write_resource_io(struct file *filp, struct kobject *kobj,
 959                       struct bin_attribute *attr, char *buf,
 960                       loff_t off, size_t count)
 961 {
 962         return pci_resource_io(filp, kobj, attr, buf, off, count, true);
 963 }
 964
 965 /**
 966  * pci_remove_resource_files - cleanup resource files
 967  * @pdev: dev to cleanup
 968  *
 969  * If we created resource files for @pdev, remove them from sysfs and
 970  * free their resources.
 971  */
 972 static void
 973 pci_remove_resource_files(struct pci_dev *pdev)
 974 {
 975         int i;
 976
 977         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 978                 struct bin_attribute *res_attr;
 979
 980                 res_attr = pdev->res_attr[i];
 981                 if (res_attr) {
 982                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 983                         kfree(res_attr);
 984                 }
 985
 986                 res_attr = pdev->res_attr_wc[i];
 987                 if (res_attr) {
 988                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 989                         kfree(res_attr);
 990                 }
 991         }
 992 }
 993
 994 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 995 {
 996         /* allocate attribute structure, piggyback attribute name */
 997         int name_len = write_combine ? 13 : 10;
 998         struct bin_attribute *res_attr;
 999         int retval;
1000
1001         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1002         if (res_attr) {
1003                 char *res_attr_name = (char *)(res_attr + 1);
1004
1005                 sysfs_bin_attr_init(res_attr);
1006                 if (write_combine) {
1007                         pdev->res_attr_wc[num] = res_attr;
1008                         sprintf(res_attr_name, "resource%d_wc", num);
1009                         res_attr->mmap = pci_mmap_resource_wc;
1010                 } else {
1011                         pdev->res_attr[num] = res_attr;
1012                         sprintf(res_attr_name, "resource%d", num);
1013                         res_attr->mmap = pci_mmap_resource_uc;
1014                 }
1015                 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1016                         res_attr->read = pci_read_resource_io;
1017                         res_attr->write = pci_write_resource_io;
1018                 }
1019                 res_attr->attr.name = res_attr_name;
1020                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1021                 res_attr->size = pci_resource_len(pdev, num);
1022                 res_attr->private = &pdev->resource[num];
1023                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1024         } else
1025                 retval = -ENOMEM;
1026
1027         return retval;
1028 }
1029
1030 /**
1031  * pci_create_resource_files - create resource files in sysfs for @dev
1032  * @pdev: dev in question
1033  *
1034  * Walk the resources in @pdev creating files for each resource available.
1035  */
1036 static int pci_create_resource_files(struct pci_dev *pdev)
1037 {
1038         int i;
1039         int retval;
1040
1041         /* Expose the PCI resources from this device as files */
1042         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1043
1044                 /* skip empty resources */
1045                 if (!pci_resource_len(pdev, i))
1046                         continue;
1047
1048                 retval = pci_create_attr(pdev, i, 0);
1049                 /* for prefetchable resources, create a WC mappable file */
1050                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1051                         retval = pci_create_attr(pdev, i, 1);
1052
1053                 if (retval) {
1054                         pci_remove_resource_files(pdev);
1055                         return retval;
1056                 }
1057         }
1058         return 0;
1059 }
1060 #else /* !HAVE_PCI_MMAP */
1061 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1062 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1063 #endif /* HAVE_PCI_MMAP */
1064
1065 /**
1066  * pci_write_rom - used to enable access to the PCI ROM display
1067  * @filp: sysfs file
1068  * @kobj: kernel object handle
1069  * @bin_attr: struct bin_attribute for this file
1070  * @buf: user input
1071  * @off: file offset
1072  * @count: number of byte in input
1073  *
1074  * writing anything except 0 enables it
1075  */
1076 static ssize_t
1077 pci_write_rom(struct file *filp, struct kobject *kobj,
1078               struct bin_attribute *bin_attr,
1079               char *buf, loff_t off, size_t count)
1080 {
1081         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1082
1083         if ((off ==  0) && (*buf == '0') && (count == 2))
1084                 pdev->rom_attr_enabled = 0;
1085         else
1086                 pdev->rom_attr_enabled = 1;
1087
1088         return count;
1089 }
1090
1091 /**
1092  * pci_read_rom - read a PCI ROM
1093  * @filp: sysfs file
1094  * @kobj: kernel object handle
1095  * @bin_attr: struct bin_attribute for this file
1096  * @buf: where to put the data we read from the ROM
1097  * @off: file offset
1098  * @count: number of bytes to read
1099  *
1100  * Put @count bytes starting at @off into @buf from the ROM in the PCI
1101  * device corresponding to @kobj.
1102  */
1103 static ssize_t
1104 pci_read_rom(struct file *filp, struct kobject *kobj,
1105              struct bin_attribute *bin_attr,
1106              char *buf, loff_t off, size_t count)
1107 {
1108         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1109         void __iomem *rom;
1110         size_t size;
1111
1112         if (!pdev->rom_attr_enabled)
1113                 return -EINVAL;
1114
1115         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1116         if (!rom || !size)
1117                 return -EIO;
1118
1119         if (off >= size)
1120                 count = 0;
1121         else {
1122                 if (off + count > size)
1123                         count = size - off;
1124
1125                 memcpy_fromio(buf, rom + off, count);
1126         }
1127         pci_unmap_rom(pdev, rom);
1128
1129         return count;
1130 }
1131
1132 static struct bin_attribute pci_config_attr = {
1133         .attr = {
1134                 .name = "config",
1135                 .mode = S_IRUGO | S_IWUSR,
1136         },
1137         .size = PCI_CFG_SPACE_SIZE,
1138         .read = pci_read_config,
1139         .write = pci_write_config,
1140 };
1141
1142 static struct bin_attribute pcie_config_attr = {
1143         .attr = {
1144                 .name = "config",
1145                 .mode = S_IRUGO | S_IWUSR,
1146         },
1147         .size = PCI_CFG_SPACE_EXP_SIZE,
1148         .read = pci_read_config,
1149         .write = pci_write_config,
1150 };
1151
1152 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1153 {
1154         return 0;
1155 }
1156
1157 static ssize_t reset_store(struct device *dev,
1158                            struct device_attribute *attr, const char *buf,
1159                            size_t count)
1160 {
1161         struct pci_dev *pdev = to_pci_dev(dev);
1162         unsigned long val;
1163         ssize_t result = strict_strtoul(buf, 0, &val);
1164
1165         if (result < 0)
1166                 return result;
1167
1168         if (val != 1)
1169                 return -EINVAL;
1170
1171         result = pci_reset_function(pdev);
1172         if (result < 0)
1173                 return result;
1174
1175         return count;
1176 }
1177
1178 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1179
1180 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1181 {
1182         int retval;
1183         struct bin_attribute *attr;
1184
1185         /* If the device has VPD, try to expose it in sysfs. */
1186         if (dev->vpd) {
1187                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1188                 if (!attr)
1189                         return -ENOMEM;
1190
1191                 sysfs_bin_attr_init(attr);
1192                 attr->size = dev->vpd->len;
1193                 attr->attr.name = "vpd";
1194                 attr->attr.mode = S_IRUSR | S_IWUSR;
1195                 attr->read = read_vpd_attr;
1196                 attr->write = write_vpd_attr;
1197                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1198                 if (retval) {
1199                         kfree(attr);
1200                         return retval;
1201                 }
1202                 dev->vpd->attr = attr;
1203         }
1204
1205         /* Active State Power Management */
1206         pcie_aspm_create_sysfs_dev_files(dev);
1207
1208         if (!pci_probe_reset_function(dev)) {
1209                 retval = device_create_file(&dev->dev, &reset_attr);
1210                 if (retval)
1211                         goto error;
1212                 dev->reset_fn = 1;
1213         }
1214         return 0;
1215
1216 error:
1217         pcie_aspm_remove_sysfs_dev_files(dev);
1218         if (dev->vpd && dev->vpd->attr) {
1219                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1220                 kfree(dev->vpd->attr);
1221         }
1222
1223         return retval;
1224 }
1225
1226 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1227 {
1228         int retval;
1229         int rom_size = 0;
1230         struct bin_attribute *attr;
1231
1232         if (!sysfs_initialized)
1233                 return -EACCES;
1234
1235         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1236                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1237         else
1238                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1239         if (retval)
1240                 goto err;
1241
1242         retval = pci_create_resource_files(pdev);
1243         if (retval)
1244                 goto err_config_file;
1245
1246         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1247                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1248         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1249                 rom_size = 0x20000;
1250
1251         /* If the device has a ROM, try to expose it in sysfs. */
1252         if (rom_size) {
1253                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1254                 if (!attr) {
1255                         retval = -ENOMEM;
1256                         goto err_resource_files;
1257                 }
1258                 sysfs_bin_attr_init(attr);
1259                 attr->size = rom_size;
1260                 attr->attr.name = "rom";
1261                 attr->attr.mode = S_IRUSR | S_IWUSR;
1262                 attr->read = pci_read_rom;
1263                 attr->write = pci_write_rom;
1264                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1265                 if (retval) {
1266                         kfree(attr);
1267                         goto err_resource_files;
1268                 }
1269                 pdev->rom_attr = attr;
1270         }
1271
1272         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1273                 retval = device_create_file(&pdev->dev, &vga_attr);
1274                 if (retval)
1275                         goto err_rom_file;
1276         }
1277
1278         /* add platform-specific attributes */
1279         retval = pcibios_add_platform_entries(pdev);
1280         if (retval)
1281                 goto err_vga_file;
1282
1283         /* add sysfs entries for various capabilities */
1284         retval = pci_create_capabilities_sysfs(pdev);
1285         if (retval)
1286                 goto err_vga_file;
1287
1288         pci_create_firmware_label_files(pdev);
1289
1290         return 0;
1291
1292 err_vga_file:
1293         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1294                 device_remove_file(&pdev->dev, &vga_attr);
1295 err_rom_file:
1296         if (rom_size) {
1297                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1298                 kfree(pdev->rom_attr);
1299                 pdev->rom_attr = NULL;
1300         }
1301 err_resource_files:
1302         pci_remove_resource_files(pdev);
1303 err_config_file:
1304         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1305                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1306         else
1307                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1308 err:
1309         return retval;
1310 }
1311
1312 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1313 {
1314         if (dev->vpd && dev->vpd->attr) {
1315                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1316                 kfree(dev->vpd->attr);
1317         }
1318
1319         pcie_aspm_remove_sysfs_dev_files(dev);
1320         if (dev->reset_fn) {
1321                 device_remove_file(&dev->dev, &reset_attr);
1322                 dev->reset_fn = 0;
1323         }
1324 }
1325
1326 /**
1327  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1328  * @pdev: device whose entries we should free
1329  *
1330  * Cleanup when @pdev is removed from sysfs.
1331  */
1332 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1333 {
1334         int rom_size = 0;
1335
1336         if (!sysfs_initialized)
1337                 return;
1338
1339         pci_remove_capabilities_sysfs(pdev);
1340
1341         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1342                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1343         else
1344                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1345
1346         pci_remove_resource_files(pdev);
1347
1348         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1349                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1350         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1351                 rom_size = 0x20000;
1352
1353         if (rom_size && pdev->rom_attr) {
1354                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1355                 kfree(pdev->rom_attr);
1356         }
1357
1358         pci_remove_firmware_label_files(pdev);
1359
1360 }
1361
1362 static int __init pci_sysfs_init(void)
1363 {
1364         struct pci_dev *pdev = NULL;
1365         int retval;
1366
1367         sysfs_initialized = 1;
1368         for_each_pci_dev(pdev) {
1369                 retval = pci_create_sysfs_dev_files(pdev);
1370                 if (retval) {
1371                         pci_dev_put(pdev);
1372                         return retval;
1373                 }
1374         }
1375
1376         return 0;
1377 }
1378
1379 late_initcall(pci_sysfs_init);