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 <linux/of.h>
  33 #include "pci.h"
  34
  35 static int sysfs_initialized;   /* = 0 */
  36
  37 /* show configuration fields */
  38 #define pci_config_attr(field, format_string)                           \
  39 static ssize_t                                                          \
  40 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  41 {                                                                       \
  42         struct pci_dev *pdev;                                           \
  43                                                                         \
  44         pdev = to_pci_dev (dev);                                        \
  45         return sprintf (buf, format_string, pdev->field);               \
  46 }                                                                       \
  47 static DEVICE_ATTR_RO(field)
  48
  49 pci_config_attr(vendor, "0x%04x\n");
  50 pci_config_attr(device, "0x%04x\n");
  51 pci_config_attr(subsystem_vendor, "0x%04x\n");
  52 pci_config_attr(subsystem_device, "0x%04x\n");
  53 pci_config_attr(class, "0x%06x\n");
  54 pci_config_attr(irq, "%u\n");
  55
  56 static ssize_t broken_parity_status_show(struct device *dev,
  57                                          struct device_attribute *attr,
  58                                          char *buf)
  59 {
  60         struct pci_dev *pdev = to_pci_dev(dev);
  61         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  62 }
  63
  64 static ssize_t broken_parity_status_store(struct device *dev,
  65                                           struct device_attribute *attr,
  66                                           const char *buf, size_t count)
  67 {
  68         struct pci_dev *pdev = to_pci_dev(dev);
  69         unsigned long val;
  70
  71         if (kstrtoul(buf, 0, &val) < 0)
  72                 return -EINVAL;
  73
  74         pdev->broken_parity_status = !!val;
  75
  76         return count;
  77 }
  78 static DEVICE_ATTR_RW(broken_parity_status);
  79
  80 static ssize_t pci_dev_show_local_cpu(struct device *dev,
  81                 int type,
  82                 struct device_attribute *attr,
  83                 char *buf)
  84 {
  85         const struct cpumask *mask;
  86         int len;
  87
  88 #ifdef CONFIG_NUMA
  89         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  90                                           cpumask_of_node(dev_to_node(dev));
  91 #else
  92         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  93 #endif
  94         len = type ?
  95                 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
  96                 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
  97
  98         buf[len++] = '\n';
  99         buf[len] = '\0';
 100         return len;
 101 }
 102
 103 static ssize_t local_cpus_show(struct device *dev,
 104                         struct device_attribute *attr, char *buf)
 105 {
 106         return pci_dev_show_local_cpu(dev, 1, attr, buf);
 107 }
 108 static DEVICE_ATTR_RO(local_cpus);
 109
 110 static ssize_t local_cpulist_show(struct device *dev,
 111                         struct device_attribute *attr, char *buf)
 112 {
 113         return pci_dev_show_local_cpu(dev, 0, attr, buf);
 114 }
 115 static DEVICE_ATTR_RO(local_cpulist);
 116
 117 /*
 118  * PCI Bus Class Devices
 119  */
 120 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
 121                                         int type,
 122                                         struct device_attribute *attr,
 123                                         char *buf)
 124 {
 125         int ret;
 126         const struct cpumask *cpumask;
 127
 128         cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 129         ret = type ?
 130                 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
 131                 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
 132         buf[ret++] = '\n';
 133         buf[ret] = '\0';
 134         return ret;
 135 }
 136
 137 static ssize_t cpuaffinity_show(struct device *dev,
 138                                 struct device_attribute *attr, char *buf)
 139 {
 140         return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
 141 }
 142 static DEVICE_ATTR_RO(cpuaffinity);
 143
 144 static ssize_t cpulistaffinity_show(struct device *dev,
 145                                     struct device_attribute *attr, char *buf)
 146 {
 147         return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
 148 }
 149 static DEVICE_ATTR_RO(cpulistaffinity);
 150
 151 /* show resources */
 152 static ssize_t
 153 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 154 {
 155         struct pci_dev * pci_dev = to_pci_dev(dev);
 156         char * str = buf;
 157         int i;
 158         int max;
 159         resource_size_t start, end;
 160
 161         if (pci_dev->subordinate)
 162                 max = DEVICE_COUNT_RESOURCE;
 163         else
 164                 max = PCI_BRIDGE_RESOURCES;
 165
 166         for (i = 0; i < max; i++) {
 167                 struct resource *res =  &pci_dev->resource[i];
 168                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 169                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 170                                (unsigned long long)start,
 171                                (unsigned long long)end,
 172                                (unsigned long long)res->flags);
 173         }
 174         return (str - buf);
 175 }
 176 static DEVICE_ATTR_RO(resource);
 177
 178 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 179 {
 180         struct pci_dev *pci_dev = to_pci_dev(dev);
 181
 182         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 183                        pci_dev->vendor, pci_dev->device,
 184                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 185                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 186                        (u8)(pci_dev->class));
 187 }
 188 static DEVICE_ATTR_RO(modalias);
 189
 190 static ssize_t enabled_store(struct device *dev,
 191                              struct device_attribute *attr, const char *buf,
 192                              size_t count)
 193 {
 194         struct pci_dev *pdev = to_pci_dev(dev);
 195         unsigned long val;
 196         ssize_t result = kstrtoul(buf, 0, &val);
 197
 198         if (result < 0)
 199                 return result;
 200
 201         /* this can crash the machine when done on the "wrong" device */
 202         if (!capable(CAP_SYS_ADMIN))
 203                 return -EPERM;
 204
 205         if (!val) {
 206                 if (pci_is_enabled(pdev))
 207                         pci_disable_device(pdev);
 208                 else
 209                         result = -EIO;
 210         } else
 211                 result = pci_enable_device(pdev);
 212
 213         return result < 0 ? result : count;
 214 }
 215
 216 static ssize_t enabled_show(struct device *dev,
 217                             struct device_attribute *attr, char *buf)
 218 {
 219         struct pci_dev *pdev;
 220
 221         pdev = to_pci_dev (dev);
 222         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 223 }
 224 static DEVICE_ATTR_RW(enabled);
 225
 226 #ifdef CONFIG_NUMA
 227 static ssize_t
 228 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 229 {
 230         return sprintf (buf, "%d\n", dev->numa_node);
 231 }
 232 static DEVICE_ATTR_RO(numa_node);
 233 #endif
 234
 235 static ssize_t
 236 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
 237 {
 238         struct pci_dev *pdev = to_pci_dev(dev);
 239
 240         return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
 241 }
 242 static DEVICE_ATTR_RO(dma_mask_bits);
 243
 244 static ssize_t
 245 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
 246                                  char *buf)
 247 {
 248         return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
 249 }
 250 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
 251
 252 static ssize_t
 253 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 254 {
 255         struct pci_dev *pdev = to_pci_dev(dev);
 256
 257         if (!pdev->subordinate)
 258                 return 0;
 259
 260         return sprintf (buf, "%u\n",
 261                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 262 }
 263
 264 static ssize_t
 265 msi_bus_store(struct device *dev, struct device_attribute *attr,
 266               const char *buf, size_t count)
 267 {
 268         struct pci_dev *pdev = to_pci_dev(dev);
 269         unsigned long val;
 270
 271         if (kstrtoul(buf, 0, &val) < 0)
 272                 return -EINVAL;
 273
 274         /*
 275          * Bad things may happen if the no_msi flag is changed
 276          * while drivers are loaded.
 277          */
 278         if (!capable(CAP_SYS_ADMIN))
 279                 return -EPERM;
 280
 281         /*
 282          * Maybe devices without subordinate buses shouldn't have this
 283          * attribute in the first place?
 284          */
 285         if (!pdev->subordinate)
 286                 return count;
 287
 288         /* Is the flag going to change, or keep the value it already had? */
 289         if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 290             !!val) {
 291                 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 292
 293                 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 294                          " bad things could happen\n", val ? "" : " not");
 295         }
 296
 297         return count;
 298 }
 299 static DEVICE_ATTR_RW(msi_bus);
 300
 301 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 302                                 size_t count)
 303 {
 304         unsigned long val;
 305         struct pci_bus *b = NULL;
 306
 307         if (kstrtoul(buf, 0, &val) < 0)
 308                 return -EINVAL;
 309
 310         if (val) {
 311                 pci_lock_rescan_remove();
 312                 while ((b = pci_find_next_bus(b)) != NULL)
 313                         pci_rescan_bus(b);
 314                 pci_unlock_rescan_remove();
 315         }
 316         return count;
 317 }
 318 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
 319
 320 static struct attribute *pci_bus_attrs[] = {
 321         &bus_attr_rescan.attr,
 322         NULL,
 323 };
 324
 325 static const struct attribute_group pci_bus_group = {
 326         .attrs = pci_bus_attrs,
 327 };
 328
 329 const struct attribute_group *pci_bus_groups[] = {
 330         &pci_bus_group,
 331         NULL,
 332 };
 333
 334 static ssize_t
 335 dev_rescan_store(struct device *dev, struct device_attribute *attr,
 336                  const char *buf, size_t count)
 337 {
 338         unsigned long val;
 339         struct pci_dev *pdev = to_pci_dev(dev);
 340
 341         if (kstrtoul(buf, 0, &val) < 0)
 342                 return -EINVAL;
 343
 344         if (val) {
 345                 pci_lock_rescan_remove();
 346                 pci_rescan_bus(pdev->bus);
 347                 pci_unlock_rescan_remove();
 348         }
 349         return count;
 350 }
 351 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
 352                                                         (S_IWUSR|S_IWGRP),
 353                                                         NULL, dev_rescan_store);
 354
 355 static ssize_t
 356 remove_store(struct device *dev, struct device_attribute *attr,
 357              const char *buf, size_t count)
 358 {
 359         unsigned long val;
 360
 361         if (kstrtoul(buf, 0, &val) < 0)
 362                 return -EINVAL;
 363
 364         if (val && device_remove_file_self(dev, attr))
 365                 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
 366         return count;
 367 }
 368 static struct device_attribute dev_remove_attr = __ATTR(remove,
 369                                                         (S_IWUSR|S_IWGRP),
 370                                                         NULL, remove_store);
 371
 372 static ssize_t
 373 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 374                  const char *buf, size_t count)
 375 {
 376         unsigned long val;
 377         struct pci_bus *bus = to_pci_bus(dev);
 378
 379         if (kstrtoul(buf, 0, &val) < 0)
 380                 return -EINVAL;
 381
 382         if (val) {
 383                 pci_lock_rescan_remove();
 384                 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
 385                         pci_rescan_bus_bridge_resize(bus->self);
 386                 else
 387                         pci_rescan_bus(bus);
 388                 pci_unlock_rescan_remove();
 389         }
 390         return count;
 391 }
 392 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
 393
 394 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 395 static ssize_t d3cold_allowed_store(struct device *dev,
 396                                     struct device_attribute *attr,
 397                                     const char *buf, size_t count)
 398 {
 399         struct pci_dev *pdev = to_pci_dev(dev);
 400         unsigned long val;
 401
 402         if (kstrtoul(buf, 0, &val) < 0)
 403                 return -EINVAL;
 404
 405         pdev->d3cold_allowed = !!val;
 406         pm_runtime_resume(dev);
 407
 408         return count;
 409 }
 410
 411 static ssize_t d3cold_allowed_show(struct device *dev,
 412                                    struct device_attribute *attr, char *buf)
 413 {
 414         struct pci_dev *pdev = to_pci_dev(dev);
 415         return sprintf (buf, "%u\n", pdev->d3cold_allowed);
 416 }
 417 static DEVICE_ATTR_RW(d3cold_allowed);
 418 #endif
 419
 420 #ifdef CONFIG_OF
 421 static ssize_t devspec_show(struct device *dev,
 422                             struct device_attribute *attr, char *buf)
 423 {
 424         struct pci_dev *pdev = to_pci_dev(dev);
 425         struct device_node *np = pci_device_to_OF_node(pdev);
 426
 427         if (np == NULL || np->full_name == NULL)
 428                 return 0;
 429         return sprintf(buf, "%s", np->full_name);
 430 }
 431 static DEVICE_ATTR_RO(devspec);
 432 #endif
 433
 434 #ifdef CONFIG_PCI_IOV
 435 static ssize_t sriov_totalvfs_show(struct device *dev,
 436                                    struct device_attribute *attr,
 437                                    char *buf)
 438 {
 439         struct pci_dev *pdev = to_pci_dev(dev);
 440
 441         return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
 442 }
 443
 444
 445 static ssize_t sriov_numvfs_show(struct device *dev,
 446                                  struct device_attribute *attr,
 447                                  char *buf)
 448 {
 449         struct pci_dev *pdev = to_pci_dev(dev);
 450
 451         return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
 452 }
 453
 454 /*
 455  * num_vfs > 0; number of VFs to enable
 456  * num_vfs = 0; disable all VFs
 457  *
 458  * Note: SRIOV spec doesn't allow partial VF
 459  *       disable, so it's all or none.
 460  */
 461 static ssize_t sriov_numvfs_store(struct device *dev,
 462                                   struct device_attribute *attr,
 463                                   const char *buf, size_t count)
 464 {
 465         struct pci_dev *pdev = to_pci_dev(dev);
 466         int ret;
 467         u16 num_vfs;
 468
 469         ret = kstrtou16(buf, 0, &num_vfs);
 470         if (ret < 0)
 471                 return ret;
 472
 473         if (num_vfs > pci_sriov_get_totalvfs(pdev))
 474                 return -ERANGE;
 475
 476         if (num_vfs == pdev->sriov->num_VFs)
 477                 return count;           /* no change */
 478
 479         /* is PF driver loaded w/callback */
 480         if (!pdev->driver || !pdev->driver->sriov_configure) {
 481                 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
 482                 return -ENOSYS;
 483         }
 484
 485         if (num_vfs == 0) {
 486                 /* disable VFs */
 487                 ret = pdev->driver->sriov_configure(pdev, 0);
 488                 if (ret < 0)
 489                         return ret;
 490                 return count;
 491         }
 492
 493         /* enable VFs */
 494         if (pdev->sriov->num_VFs) {
 495                 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
 496                          pdev->sriov->num_VFs, num_vfs);
 497                 return -EBUSY;
 498         }
 499
 500         ret = pdev->driver->sriov_configure(pdev, num_vfs);
 501         if (ret < 0)
 502                 return ret;
 503
 504         if (ret != num_vfs)
 505                 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
 506                          num_vfs, ret);
 507
 508         return count;
 509 }
 510
 511 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
 512 static struct device_attribute sriov_numvfs_attr =
 513                 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
 514                        sriov_numvfs_show, sriov_numvfs_store);
 515 #endif /* CONFIG_PCI_IOV */
 516
 517 static ssize_t driver_override_store(struct device *dev,
 518                                      struct device_attribute *attr,
 519                                      const char *buf, size_t count)
 520 {
 521         struct pci_dev *pdev = to_pci_dev(dev);
 522         char *driver_override, *old = pdev->driver_override, *cp;
 523
 524         if (count > PATH_MAX)
 525                 return -EINVAL;
 526
 527         driver_override = kstrndup(buf, count, GFP_KERNEL);
 528         if (!driver_override)
 529                 return -ENOMEM;
 530
 531         cp = strchr(driver_override, '\n');
 532         if (cp)
 533                 *cp = '\0';
 534
 535         if (strlen(driver_override)) {
 536                 pdev->driver_override = driver_override;
 537         } else {
 538                 kfree(driver_override);
 539                 pdev->driver_override = NULL;
 540         }
 541
 542         kfree(old);
 543
 544         return count;
 545 }
 546
 547 static ssize_t driver_override_show(struct device *dev,
 548                                     struct device_attribute *attr, char *buf)
 549 {
 550         struct pci_dev *pdev = to_pci_dev(dev);
 551
 552         return sprintf(buf, "%s\n", pdev->driver_override);
 553 }
 554 static DEVICE_ATTR_RW(driver_override);
 555
 556 static struct attribute *pci_dev_attrs[] = {
 557         &dev_attr_resource.attr,
 558         &dev_attr_vendor.attr,
 559         &dev_attr_device.attr,
 560         &dev_attr_subsystem_vendor.attr,
 561         &dev_attr_subsystem_device.attr,
 562         &dev_attr_class.attr,
 563         &dev_attr_irq.attr,
 564         &dev_attr_local_cpus.attr,
 565         &dev_attr_local_cpulist.attr,
 566         &dev_attr_modalias.attr,
 567 #ifdef CONFIG_NUMA
 568         &dev_attr_numa_node.attr,
 569 #endif
 570         &dev_attr_dma_mask_bits.attr,
 571         &dev_attr_consistent_dma_mask_bits.attr,
 572         &dev_attr_enabled.attr,
 573         &dev_attr_broken_parity_status.attr,
 574         &dev_attr_msi_bus.attr,
 575 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 576         &dev_attr_d3cold_allowed.attr,
 577 #endif
 578 #ifdef CONFIG_OF
 579         &dev_attr_devspec.attr,
 580 #endif
 581         &dev_attr_driver_override.attr,
 582         NULL,
 583 };
 584
 585 static const struct attribute_group pci_dev_group = {
 586         .attrs = pci_dev_attrs,
 587 };
 588
 589 const struct attribute_group *pci_dev_groups[] = {
 590         &pci_dev_group,
 591         NULL,
 592 };
 593
 594 static struct attribute *pcibus_attrs[] = {
 595         &dev_attr_rescan.attr,
 596         &dev_attr_cpuaffinity.attr,
 597         &dev_attr_cpulistaffinity.attr,
 598         NULL,
 599 };
 600
 601 static const struct attribute_group pcibus_group = {
 602         .attrs = pcibus_attrs,
 603 };
 604
 605 const struct attribute_group *pcibus_groups[] = {
 606         &pcibus_group,
 607         NULL,
 608 };
 609
 610 static ssize_t
 611 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 612 {
 613         struct pci_dev *pdev = to_pci_dev(dev);
 614         struct pci_dev *vga_dev = vga_default_device();
 615
 616         if (vga_dev)
 617                 return sprintf(buf, "%u\n", (pdev == vga_dev));
 618
 619         return sprintf(buf, "%u\n",
 620                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 621                    IORESOURCE_ROM_SHADOW));
 622 }
 623 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 624
 625 static ssize_t
 626 pci_read_config(struct file *filp, struct kobject *kobj,
 627                 struct bin_attribute *bin_attr,
 628                 char *buf, loff_t off, size_t count)
 629 {
 630         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 631         unsigned int size = 64;
 632         loff_t init_off = off;
 633         u8 *data = (u8*) buf;
 634
 635         /* Several chips lock up trying to read undefined config space */
 636         if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
 637                 size = dev->cfg_size;
 638         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 639                 size = 128;
 640         }
 641
 642         if (off > size)
 643                 return 0;
 644         if (off + count > size) {
 645                 size -= off;
 646                 count = size;
 647         } else {
 648                 size = count;
 649         }
 650
 651         pci_config_pm_runtime_get(dev);
 652
 653         if ((off & 1) && size) {
 654                 u8 val;
 655                 pci_user_read_config_byte(dev, off, &val);
 656                 data[off - init_off] = val;
 657                 off++;
 658                 size--;
 659         }
 660
 661         if ((off & 3) && size > 2) {
 662                 u16 val;
 663                 pci_user_read_config_word(dev, off, &val);
 664                 data[off - init_off] = val & 0xff;
 665                 data[off - init_off + 1] = (val >> 8) & 0xff;
 666                 off += 2;
 667                 size -= 2;
 668         }
 669
 670         while (size > 3) {
 671                 u32 val;
 672                 pci_user_read_config_dword(dev, off, &val);
 673                 data[off - init_off] = val & 0xff;
 674                 data[off - init_off + 1] = (val >> 8) & 0xff;
 675                 data[off - init_off + 2] = (val >> 16) & 0xff;
 676                 data[off - init_off + 3] = (val >> 24) & 0xff;
 677                 off += 4;
 678                 size -= 4;
 679         }
 680
 681         if (size >= 2) {
 682                 u16 val;
 683                 pci_user_read_config_word(dev, off, &val);
 684                 data[off - init_off] = val & 0xff;
 685                 data[off - init_off + 1] = (val >> 8) & 0xff;
 686                 off += 2;
 687                 size -= 2;
 688         }
 689
 690         if (size > 0) {
 691                 u8 val;
 692                 pci_user_read_config_byte(dev, off, &val);
 693                 data[off - init_off] = val;
 694                 off++;
 695                 --size;
 696         }
 697
 698         pci_config_pm_runtime_put(dev);
 699
 700         return count;
 701 }
 702
 703 static ssize_t
 704 pci_write_config(struct file* filp, struct kobject *kobj,
 705                  struct bin_attribute *bin_attr,
 706                  char *buf, loff_t off, size_t count)
 707 {
 708         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 709         unsigned int size = count;
 710         loff_t init_off = off;
 711         u8 *data = (u8*) buf;
 712
 713         if (off > dev->cfg_size)
 714                 return 0;
 715         if (off + count > dev->cfg_size) {
 716                 size = dev->cfg_size - off;
 717                 count = size;
 718         }
 719
 720         pci_config_pm_runtime_get(dev);
 721
 722         if ((off & 1) && size) {
 723                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 724                 off++;
 725                 size--;
 726         }
 727
 728         if ((off & 3) && size > 2) {
 729                 u16 val = data[off - init_off];
 730                 val |= (u16) data[off - init_off + 1] << 8;
 731                 pci_user_write_config_word(dev, off, val);
 732                 off += 2;
 733                 size -= 2;
 734         }
 735
 736         while (size > 3) {
 737                 u32 val = data[off - init_off];
 738                 val |= (u32) data[off - init_off + 1] << 8;
 739                 val |= (u32) data[off - init_off + 2] << 16;
 740                 val |= (u32) data[off - init_off + 3] << 24;
 741                 pci_user_write_config_dword(dev, off, val);
 742                 off += 4;
 743                 size -= 4;
 744         }
 745
 746         if (size >= 2) {
 747                 u16 val = data[off - init_off];
 748                 val |= (u16) data[off - init_off + 1] << 8;
 749                 pci_user_write_config_word(dev, off, val);
 750                 off += 2;
 751                 size -= 2;
 752         }
 753
 754         if (size) {
 755                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 756                 off++;
 757                 --size;
 758         }
 759
 760         pci_config_pm_runtime_put(dev);
 761
 762         return count;
 763 }
 764
 765 static ssize_t
 766 read_vpd_attr(struct file *filp, struct kobject *kobj,
 767               struct bin_attribute *bin_attr,
 768               char *buf, loff_t off, size_t count)
 769 {
 770         struct pci_dev *dev =
 771                 to_pci_dev(container_of(kobj, struct device, kobj));
 772
 773         if (off > bin_attr->size)
 774                 count = 0;
 775         else if (count > bin_attr->size - off)
 776                 count = bin_attr->size - off;
 777
 778         return pci_read_vpd(dev, off, count, buf);
 779 }
 780
 781 static ssize_t
 782 write_vpd_attr(struct file *filp, struct kobject *kobj,
 783                struct bin_attribute *bin_attr,
 784                char *buf, loff_t off, size_t count)
 785 {
 786         struct pci_dev *dev =
 787                 to_pci_dev(container_of(kobj, struct device, kobj));
 788
 789         if (off > bin_attr->size)
 790                 count = 0;
 791         else if (count > bin_attr->size - off)
 792                 count = bin_attr->size - off;
 793
 794         return pci_write_vpd(dev, off, count, buf);
 795 }
 796
 797 #ifdef HAVE_PCI_LEGACY
 798 /**
 799  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 800  * @filp: open sysfs file
 801  * @kobj: kobject corresponding to file to read from
 802  * @bin_attr: struct bin_attribute for this file
 803  * @buf: buffer to store results
 804  * @off: offset into legacy I/O port space
 805  * @count: number of bytes to read
 806  *
 807  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 808  * callback routine (pci_legacy_read).
 809  */
 810 static ssize_t
 811 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 812                    struct bin_attribute *bin_attr,
 813                    char *buf, loff_t off, size_t count)
 814 {
 815         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 816                                                       struct device,
 817                                                       kobj));
 818
 819         /* Only support 1, 2 or 4 byte accesses */
 820         if (count != 1 && count != 2 && count != 4)
 821                 return -EINVAL;
 822
 823         return pci_legacy_read(bus, off, (u32 *)buf, count);
 824 }
 825
 826 /**
 827  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 828  * @filp: open sysfs file
 829  * @kobj: kobject corresponding to file to read from
 830  * @bin_attr: struct bin_attribute for this file
 831  * @buf: buffer containing value to be written
 832  * @off: offset into legacy I/O port space
 833  * @count: number of bytes to write
 834  *
 835  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 836  * callback routine (pci_legacy_write).
 837  */
 838 static ssize_t
 839 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 840                     struct bin_attribute *bin_attr,
 841                     char *buf, loff_t off, size_t count)
 842 {
 843         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 844                                                       struct device,
 845                                                       kobj));
 846         /* Only support 1, 2 or 4 byte accesses */
 847         if (count != 1 && count != 2 && count != 4)
 848                 return -EINVAL;
 849
 850         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 851 }
 852
 853 /**
 854  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 855  * @filp: open sysfs file
 856  * @kobj: kobject corresponding to device to be mapped
 857  * @attr: struct bin_attribute for this file
 858  * @vma: struct vm_area_struct passed to mmap
 859  *
 860  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 861  * legacy memory space (first meg of bus space) into application virtual
 862  * memory space.
 863  */
 864 static int
 865 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 866                     struct bin_attribute *attr,
 867                     struct vm_area_struct *vma)
 868 {
 869         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 870                                                       struct device,
 871                                                       kobj));
 872
 873         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 874 }
 875
 876 /**
 877  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 878  * @filp: open sysfs file
 879  * @kobj: kobject corresponding to device to be mapped
 880  * @attr: struct bin_attribute for this file
 881  * @vma: struct vm_area_struct passed to mmap
 882  *
 883  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 884  * legacy IO space (first meg of bus space) into application virtual
 885  * memory space. Returns -ENOSYS if the operation isn't supported
 886  */
 887 static int
 888 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 889                    struct bin_attribute *attr,
 890                    struct vm_area_struct *vma)
 891 {
 892         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 893                                                       struct device,
 894                                                       kobj));
 895
 896         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 897 }
 898
 899 /**
 900  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 901  * @b: bus to create files under
 902  * @mmap_type: I/O port or memory
 903  *
 904  * Stub implementation. Can be overridden by arch if necessary.
 905  */
 906 void __weak
 907 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 908 {
 909         return;
 910 }
 911
 912 /**
 913  * pci_create_legacy_files - create legacy I/O port and memory files
 914  * @b: bus to create files under
 915  *
 916  * Some platforms allow access to legacy I/O port and ISA memory space on
 917  * a per-bus basis.  This routine creates the files and ties them into
 918  * their associated read, write and mmap files from pci-sysfs.c
 919  *
 920  * On error unwind, but don't propagate the error to the caller
 921  * as it is ok to set up the PCI bus without these files.
 922  */
 923 void pci_create_legacy_files(struct pci_bus *b)
 924 {
 925         int error;
 926
 927         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 928                                GFP_ATOMIC);
 929         if (!b->legacy_io)
 930                 goto kzalloc_err;
 931
 932         sysfs_bin_attr_init(b->legacy_io);
 933         b->legacy_io->attr.name = "legacy_io";
 934         b->legacy_io->size = 0xffff;
 935         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 936         b->legacy_io->read = pci_read_legacy_io;
 937         b->legacy_io->write = pci_write_legacy_io;
 938         b->legacy_io->mmap = pci_mmap_legacy_io;
 939         pci_adjust_legacy_attr(b, pci_mmap_io);
 940         error = device_create_bin_file(&b->dev, b->legacy_io);
 941         if (error)
 942                 goto legacy_io_err;
 943
 944         /* Allocated above after the legacy_io struct */
 945         b->legacy_mem = b->legacy_io + 1;
 946         sysfs_bin_attr_init(b->legacy_mem);
 947         b->legacy_mem->attr.name = "legacy_mem";
 948         b->legacy_mem->size = 1024*1024;
 949         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 950         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 951         pci_adjust_legacy_attr(b, pci_mmap_mem);
 952         error = device_create_bin_file(&b->dev, b->legacy_mem);
 953         if (error)
 954                 goto legacy_mem_err;
 955
 956         return;
 957
 958 legacy_mem_err:
 959         device_remove_bin_file(&b->dev, b->legacy_io);
 960 legacy_io_err:
 961         kfree(b->legacy_io);
 962         b->legacy_io = NULL;
 963 kzalloc_err:
 964         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 965                "and ISA memory resources to sysfs\n");
 966         return;
 967 }
 968
 969 void pci_remove_legacy_files(struct pci_bus *b)
 970 {
 971         if (b->legacy_io) {
 972                 device_remove_bin_file(&b->dev, b->legacy_io);
 973                 device_remove_bin_file(&b->dev, b->legacy_mem);
 974                 kfree(b->legacy_io); /* both are allocated here */
 975         }
 976 }
 977 #endif /* HAVE_PCI_LEGACY */
 978
 979 #ifdef HAVE_PCI_MMAP
 980
 981 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 982                   enum pci_mmap_api mmap_api)
 983 {
 984         unsigned long nr, start, size, pci_start;
 985
 986         if (pci_resource_len(pdev, resno) == 0)
 987                 return 0;
 988         nr = vma_pages(vma);
 989         start = vma->vm_pgoff;
 990         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 991         pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 992                         pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 993         if (start >= pci_start && start < pci_start + size &&
 994                         start + nr <= pci_start + size)
 995                 return 1;
 996         return 0;
 997 }
 998
 999 /**
1000  * pci_mmap_resource - map a PCI resource into user memory space
1001  * @kobj: kobject for mapping
1002  * @attr: struct bin_attribute for the file being mapped
1003  * @vma: struct vm_area_struct passed into the mmap
1004  * @write_combine: 1 for write_combine mapping
1005  *
1006  * Use the regular PCI mapping routines to map a PCI resource into userspace.
1007  */
1008 static int
1009 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1010                   struct vm_area_struct *vma, int write_combine)
1011 {
1012         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1013                                                        struct device, kobj));
1014         struct resource *res = attr->private;
1015         enum pci_mmap_state mmap_type;
1016         resource_size_t start, end;
1017         int i;
1018
1019         for (i = 0; i < PCI_ROM_RESOURCE; i++)
1020                 if (res == &pdev->resource[i])
1021                         break;
1022         if (i >= PCI_ROM_RESOURCE)
1023                 return -ENODEV;
1024
1025         if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1026                 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
1027                         "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1028                         current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1029                         pci_name(pdev), i,
1030                         (u64)pci_resource_start(pdev, i),
1031                         (u64)pci_resource_len(pdev, i));
1032                 return -EINVAL;
1033         }
1034
1035         /* pci_mmap_page_range() expects the same kind of entry as coming
1036          * from /proc/bus/pci/ which is a "user visible" value. If this is
1037          * different from the resource itself, arch will do necessary fixup.
1038          */
1039         pci_resource_to_user(pdev, i, res, &start, &end);
1040         vma->vm_pgoff += start >> PAGE_SHIFT;
1041         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1042
1043         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1044                 return -EINVAL;
1045
1046         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1047 }
1048
1049 static int
1050 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1051                      struct bin_attribute *attr,
1052                      struct vm_area_struct *vma)
1053 {
1054         return pci_mmap_resource(kobj, attr, vma, 0);
1055 }
1056
1057 static int
1058 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1059                      struct bin_attribute *attr,
1060                      struct vm_area_struct *vma)
1061 {
1062         return pci_mmap_resource(kobj, attr, vma, 1);
1063 }
1064
1065 static ssize_t
1066 pci_resource_io(struct file *filp, struct kobject *kobj,
1067                 struct bin_attribute *attr, char *buf,
1068                 loff_t off, size_t count, bool write)
1069 {
1070         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1071                                                        struct device, kobj));
1072         struct resource *res = attr->private;
1073         unsigned long port = off;
1074         int i;
1075
1076         for (i = 0; i < PCI_ROM_RESOURCE; i++)
1077                 if (res == &pdev->resource[i])
1078                         break;
1079         if (i >= PCI_ROM_RESOURCE)
1080                 return -ENODEV;
1081
1082         port += pci_resource_start(pdev, i);
1083
1084         if (port > pci_resource_end(pdev, i))
1085                 return 0;
1086
1087         if (port + count - 1 > pci_resource_end(pdev, i))
1088                 return -EINVAL;
1089
1090         switch (count) {
1091         case 1:
1092                 if (write)
1093                         outb(*(u8 *)buf, port);
1094                 else
1095                         *(u8 *)buf = inb(port);
1096                 return 1;
1097         case 2:
1098                 if (write)
1099                         outw(*(u16 *)buf, port);
1100                 else
1101                         *(u16 *)buf = inw(port);
1102                 return 2;
1103         case 4:
1104                 if (write)
1105                         outl(*(u32 *)buf, port);
1106                 else
1107                         *(u32 *)buf = inl(port);
1108                 return 4;
1109         }
1110         return -EINVAL;
1111 }
1112
1113 static ssize_t
1114 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1115                      struct bin_attribute *attr, char *buf,
1116                      loff_t off, size_t count)
1117 {
1118         return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1119 }
1120
1121 static ssize_t
1122 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1123                       struct bin_attribute *attr, char *buf,
1124                       loff_t off, size_t count)
1125 {
1126         return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1127 }
1128
1129 /**
1130  * pci_remove_resource_files - cleanup resource files
1131  * @pdev: dev to cleanup
1132  *
1133  * If we created resource files for @pdev, remove them from sysfs and
1134  * free their resources.
1135  */
1136 static void
1137 pci_remove_resource_files(struct pci_dev *pdev)
1138 {
1139         int i;
1140
1141         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1142                 struct bin_attribute *res_attr;
1143
1144                 res_attr = pdev->res_attr[i];
1145                 if (res_attr) {
1146                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1147                         kfree(res_attr);
1148                 }
1149
1150                 res_attr = pdev->res_attr_wc[i];
1151                 if (res_attr) {
1152                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1153                         kfree(res_attr);
1154                 }
1155         }
1156 }
1157
1158 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1159 {
1160         /* allocate attribute structure, piggyback attribute name */
1161         int name_len = write_combine ? 13 : 10;
1162         struct bin_attribute *res_attr;
1163         int retval;
1164
1165         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1166         if (res_attr) {
1167                 char *res_attr_name = (char *)(res_attr + 1);
1168
1169                 sysfs_bin_attr_init(res_attr);
1170                 if (write_combine) {
1171                         pdev->res_attr_wc[num] = res_attr;
1172                         sprintf(res_attr_name, "resource%d_wc", num);
1173                         res_attr->mmap = pci_mmap_resource_wc;
1174                 } else {
1175                         pdev->res_attr[num] = res_attr;
1176                         sprintf(res_attr_name, "resource%d", num);
1177                         res_attr->mmap = pci_mmap_resource_uc;
1178                 }
1179                 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1180                         res_attr->read = pci_read_resource_io;
1181                         res_attr->write = pci_write_resource_io;
1182                 }
1183                 res_attr->attr.name = res_attr_name;
1184                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1185                 res_attr->size = pci_resource_len(pdev, num);
1186                 res_attr->private = &pdev->resource[num];
1187                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1188         } else
1189                 retval = -ENOMEM;
1190
1191         return retval;
1192 }
1193
1194 /**
1195  * pci_create_resource_files - create resource files in sysfs for @dev
1196  * @pdev: dev in question
1197  *
1198  * Walk the resources in @pdev creating files for each resource available.
1199  */
1200 static int pci_create_resource_files(struct pci_dev *pdev)
1201 {
1202         int i;
1203         int retval;
1204
1205         /* Expose the PCI resources from this device as files */
1206         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1207
1208                 /* skip empty resources */
1209                 if (!pci_resource_len(pdev, i))
1210                         continue;
1211
1212                 retval = pci_create_attr(pdev, i, 0);
1213                 /* for prefetchable resources, create a WC mappable file */
1214                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1215                         retval = pci_create_attr(pdev, i, 1);
1216
1217                 if (retval) {
1218                         pci_remove_resource_files(pdev);
1219                         return retval;
1220                 }
1221         }
1222         return 0;
1223 }
1224 #else /* !HAVE_PCI_MMAP */
1225 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1226 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1227 #endif /* HAVE_PCI_MMAP */
1228
1229 /**
1230  * pci_write_rom - used to enable access to the PCI ROM display
1231  * @filp: sysfs file
1232  * @kobj: kernel object handle
1233  * @bin_attr: struct bin_attribute for this file
1234  * @buf: user input
1235  * @off: file offset
1236  * @count: number of byte in input
1237  *
1238  * writing anything except 0 enables it
1239  */
1240 static ssize_t
1241 pci_write_rom(struct file *filp, struct kobject *kobj,
1242               struct bin_attribute *bin_attr,
1243               char *buf, loff_t off, size_t count)
1244 {
1245         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1246
1247         if ((off ==  0) && (*buf == '0') && (count == 2))
1248                 pdev->rom_attr_enabled = 0;
1249         else
1250                 pdev->rom_attr_enabled = 1;
1251
1252         return count;
1253 }
1254
1255 /**
1256  * pci_read_rom - read a PCI ROM
1257  * @filp: sysfs file
1258  * @kobj: kernel object handle
1259  * @bin_attr: struct bin_attribute for this file
1260  * @buf: where to put the data we read from the ROM
1261  * @off: file offset
1262  * @count: number of bytes to read
1263  *
1264  * Put @count bytes starting at @off into @buf from the ROM in the PCI
1265  * device corresponding to @kobj.
1266  */
1267 static ssize_t
1268 pci_read_rom(struct file *filp, struct kobject *kobj,
1269              struct bin_attribute *bin_attr,
1270              char *buf, loff_t off, size_t count)
1271 {
1272         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1273         void __iomem *rom;
1274         size_t size;
1275
1276         if (!pdev->rom_attr_enabled)
1277                 return -EINVAL;
1278
1279         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1280         if (!rom || !size)
1281                 return -EIO;
1282
1283         if (off >= size)
1284                 count = 0;
1285         else {
1286                 if (off + count > size)
1287                         count = size - off;
1288
1289                 memcpy_fromio(buf, rom + off, count);
1290         }
1291         pci_unmap_rom(pdev, rom);
1292
1293         return count;
1294 }
1295
1296 static struct bin_attribute pci_config_attr = {
1297         .attr = {
1298                 .name = "config",
1299                 .mode = S_IRUGO | S_IWUSR,
1300         },
1301         .size = PCI_CFG_SPACE_SIZE,
1302         .read = pci_read_config,
1303         .write = pci_write_config,
1304 };
1305
1306 static struct bin_attribute pcie_config_attr = {
1307         .attr = {
1308                 .name = "config",
1309                 .mode = S_IRUGO | S_IWUSR,
1310         },
1311         .size = PCI_CFG_SPACE_EXP_SIZE,
1312         .read = pci_read_config,
1313         .write = pci_write_config,
1314 };
1315
1316 static ssize_t reset_store(struct device *dev,
1317                            struct device_attribute *attr, const char *buf,
1318                            size_t count)
1319 {
1320         struct pci_dev *pdev = to_pci_dev(dev);
1321         unsigned long val;
1322         ssize_t result = kstrtoul(buf, 0, &val);
1323
1324         if (result < 0)
1325                 return result;
1326
1327         if (val != 1)
1328                 return -EINVAL;
1329
1330         result = pci_reset_function(pdev);
1331         if (result < 0)
1332                 return result;
1333
1334         return count;
1335 }
1336
1337 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1338
1339 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1340 {
1341         int retval;
1342         struct bin_attribute *attr;
1343
1344         /* If the device has VPD, try to expose it in sysfs. */
1345         if (dev->vpd) {
1346                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1347                 if (!attr)
1348                         return -ENOMEM;
1349
1350                 sysfs_bin_attr_init(attr);
1351                 attr->size = dev->vpd->len;
1352                 attr->attr.name = "vpd";
1353                 attr->attr.mode = S_IRUSR | S_IWUSR;
1354                 attr->read = read_vpd_attr;
1355                 attr->write = write_vpd_attr;
1356                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1357                 if (retval) {
1358                         kfree(attr);
1359                         return retval;
1360                 }
1361                 dev->vpd->attr = attr;
1362         }
1363
1364         /* Active State Power Management */
1365         pcie_aspm_create_sysfs_dev_files(dev);
1366
1367         if (!pci_probe_reset_function(dev)) {
1368                 retval = device_create_file(&dev->dev, &reset_attr);
1369                 if (retval)
1370                         goto error;
1371                 dev->reset_fn = 1;
1372         }
1373         return 0;
1374
1375 error:
1376         pcie_aspm_remove_sysfs_dev_files(dev);
1377         if (dev->vpd && dev->vpd->attr) {
1378                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1379                 kfree(dev->vpd->attr);
1380         }
1381
1382         return retval;
1383 }
1384
1385 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1386 {
1387         int retval;
1388         int rom_size = 0;
1389         struct bin_attribute *attr;
1390
1391         if (!sysfs_initialized)
1392                 return -EACCES;
1393
1394         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1395                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1396         else
1397                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1398         if (retval)
1399                 goto err;
1400
1401         retval = pci_create_resource_files(pdev);
1402         if (retval)
1403                 goto err_config_file;
1404
1405         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1406                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1407         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1408                 rom_size = 0x20000;
1409
1410         /* If the device has a ROM, try to expose it in sysfs. */
1411         if (rom_size) {
1412                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1413                 if (!attr) {
1414                         retval = -ENOMEM;
1415                         goto err_resource_files;
1416                 }
1417                 sysfs_bin_attr_init(attr);
1418                 attr->size = rom_size;
1419                 attr->attr.name = "rom";
1420                 attr->attr.mode = S_IRUSR | S_IWUSR;
1421                 attr->read = pci_read_rom;
1422                 attr->write = pci_write_rom;
1423                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1424                 if (retval) {
1425                         kfree(attr);
1426                         goto err_resource_files;
1427                 }
1428                 pdev->rom_attr = attr;
1429         }
1430
1431         /* add sysfs entries for various capabilities */
1432         retval = pci_create_capabilities_sysfs(pdev);
1433         if (retval)
1434                 goto err_rom_file;
1435
1436         pci_create_firmware_label_files(pdev);
1437
1438         return 0;
1439
1440 err_rom_file:
1441         if (rom_size) {
1442                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1443                 kfree(pdev->rom_attr);
1444                 pdev->rom_attr = NULL;
1445         }
1446 err_resource_files:
1447         pci_remove_resource_files(pdev);
1448 err_config_file:
1449         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1450                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1451         else
1452                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1453 err:
1454         return retval;
1455 }
1456
1457 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1458 {
1459         if (dev->vpd && dev->vpd->attr) {
1460                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1461                 kfree(dev->vpd->attr);
1462         }
1463
1464         pcie_aspm_remove_sysfs_dev_files(dev);
1465         if (dev->reset_fn) {
1466                 device_remove_file(&dev->dev, &reset_attr);
1467                 dev->reset_fn = 0;
1468         }
1469 }
1470
1471 /**
1472  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1473  * @pdev: device whose entries we should free
1474  *
1475  * Cleanup when @pdev is removed from sysfs.
1476  */
1477 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1478 {
1479         int rom_size = 0;
1480
1481         if (!sysfs_initialized)
1482                 return;
1483
1484         pci_remove_capabilities_sysfs(pdev);
1485
1486         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1487                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1488         else
1489                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1490
1491         pci_remove_resource_files(pdev);
1492
1493         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1494                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1495         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1496                 rom_size = 0x20000;
1497
1498         if (rom_size && pdev->rom_attr) {
1499                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1500                 kfree(pdev->rom_attr);
1501         }
1502
1503         pci_remove_firmware_label_files(pdev);
1504
1505 }
1506
1507 static int __init pci_sysfs_init(void)
1508 {
1509         struct pci_dev *pdev = NULL;
1510         int retval;
1511
1512         sysfs_initialized = 1;
1513         for_each_pci_dev(pdev) {
1514                 retval = pci_create_sysfs_dev_files(pdev);
1515                 if (retval) {
1516                         pci_dev_put(pdev);
1517                         return retval;
1518                 }
1519         }
1520
1521         return 0;
1522 }
1523
1524 late_initcall(pci_sysfs_init);
1525
1526 static struct attribute *pci_dev_dev_attrs[] = {
1527         &vga_attr.attr,
1528         NULL,
1529 };
1530
1531 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1532                                                 struct attribute *a, int n)
1533 {
1534         struct device *dev = container_of(kobj, struct device, kobj);
1535         struct pci_dev *pdev = to_pci_dev(dev);
1536
1537         if (a == &vga_attr.attr)
1538                 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1539                         return 0;
1540
1541         return a->mode;
1542 }
1543
1544 static struct attribute *pci_dev_hp_attrs[] = {
1545         &dev_remove_attr.attr,
1546         &dev_rescan_attr.attr,
1547         NULL,
1548 };
1549
1550 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1551                                                 struct attribute *a, int n)
1552 {
1553         struct device *dev = container_of(kobj, struct device, kobj);
1554         struct pci_dev *pdev = to_pci_dev(dev);
1555
1556         if (pdev->is_virtfn)
1557                 return 0;
1558
1559         return a->mode;
1560 }
1561
1562 static struct attribute_group pci_dev_hp_attr_group = {
1563         .attrs = pci_dev_hp_attrs,
1564         .is_visible = pci_dev_hp_attrs_are_visible,
1565 };
1566
1567 #ifdef CONFIG_PCI_IOV
1568 static struct attribute *sriov_dev_attrs[] = {
1569         &sriov_totalvfs_attr.attr,
1570         &sriov_numvfs_attr.attr,
1571         NULL,
1572 };
1573
1574 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1575                                          struct attribute *a, int n)
1576 {
1577         struct device *dev = container_of(kobj, struct device, kobj);
1578
1579         if (!dev_is_pf(dev))
1580                 return 0;
1581
1582         return a->mode;
1583 }
1584
1585 static struct attribute_group sriov_dev_attr_group = {
1586         .attrs = sriov_dev_attrs,
1587         .is_visible = sriov_attrs_are_visible,
1588 };
1589 #endif /* CONFIG_PCI_IOV */
1590
1591 static struct attribute_group pci_dev_attr_group = {
1592         .attrs = pci_dev_dev_attrs,
1593         .is_visible = pci_dev_attrs_are_visible,
1594 };
1595
1596 static const struct attribute_group *pci_dev_attr_groups[] = {
1597         &pci_dev_attr_group,
1598         &pci_dev_hp_attr_group,
1599 #ifdef CONFIG_PCI_IOV
1600         &sriov_dev_attr_group,
1601 #endif
1602         NULL,
1603 };
1604
1605 struct device_type pci_dev_type = {
1606         .groups = pci_dev_attr_groups,
1607 };