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