drivers/pci/pci-sysfs.c

   1 /*
   2  * drivers/pci/pci-sysfs.c
   3  *
   4  * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
   5  * (C) Copyright 2002-2004 IBM Corp.
   6  * (C) Copyright 2003 Matthew Wilcox
   7  * (C) Copyright 2003 Hewlett-Packard
   8  * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
   9  * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
  10  *
  11  * File attributes for PCI devices
  12  *
  13  * Modeled after usb's driverfs.c
  14  *
  15  */
  16
  17
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/pci.h>
  21 #include <linux/stat.h>
  22 #include <linux/export.h>
  23 #include <linux/topology.h>
  24 #include <linux/mm.h>
  25 #include <linux/fs.h>
  26 #include <linux/capability.h>
  27 #include <linux/security.h>
  28 #include <linux/pci-aspm.h>
  29 #include <linux/slab.h>
  30 #include <linux/vgaarb.h>
  31 #include <linux/pm_runtime.h>
  32 #include "pci.h"
  33
  34 static int sysfs_initialized;   /* = 0 */
  35
  36 /* show configuration fields */
  37 #define pci_config_attr(field, format_string)                           \
  38 static ssize_t                                                          \
  39 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  40 {                                                                       \
  41         struct pci_dev *pdev;                                           \
  42                                                                         \
  43         pdev = to_pci_dev (dev);                                        \
  44         return sprintf (buf, format_string, pdev->field);               \
  45 }
  46
  47 pci_config_attr(vendor, "0x%04x\n");
  48 pci_config_attr(device, "0x%04x\n");
  49 pci_config_attr(subsystem_vendor, "0x%04x\n");
  50 pci_config_attr(subsystem_device, "0x%04x\n");
  51 pci_config_attr(class, "0x%06x\n");
  52 pci_config_attr(irq, "%u\n");
  53
  54 static ssize_t broken_parity_status_show(struct device *dev,
  55                                          struct device_attribute *attr,
  56                                          char *buf)
  57 {
  58         struct pci_dev *pdev = to_pci_dev(dev);
  59         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  60 }
  61
  62 static ssize_t broken_parity_status_store(struct device *dev,
  63                                           struct device_attribute *attr,
  64                                           const char *buf, size_t count)
  65 {
  66         struct pci_dev *pdev = to_pci_dev(dev);
  67         unsigned long val;
  68
  69         if (strict_strtoul(buf, 0, &val) < 0)
  70                 return -EINVAL;
  71
  72         pdev->broken_parity_status = !!val;
  73
  74         return count;
  75 }
  76
  77 static ssize_t local_cpus_show(struct device *dev,
  78                         struct device_attribute *attr, char *buf)
  79 {
  80         const struct cpumask *mask;
  81         int len;
  82
  83 #ifdef CONFIG_NUMA
  84         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  85                                           cpumask_of_node(dev_to_node(dev));
  86 #else
  87         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  88 #endif
  89         len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  90         buf[len++] = '\n';
  91         buf[len] = '\0';
  92         return len;
  93 }
  94
  95
  96 static ssize_t local_cpulist_show(struct device *dev,
  97                         struct device_attribute *attr, char *buf)
  98 {
  99         const struct cpumask *mask;
 100         int len;
 101
 102 #ifdef CONFIG_NUMA
 103         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
 104                                           cpumask_of_node(dev_to_node(dev));
 105 #else
 106         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
 107 #endif
 108         len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
 109         buf[len++] = '\n';
 110         buf[len] = '\0';
 111         return len;
 112 }
 113
 114 /*
 115  * PCI Bus Class Devices
 116  */
 117 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
 118                                         int type,
 119                                         struct device_attribute *attr,
 120                                         char *buf)
 121 {
 122         int ret;
 123         const struct cpumask *cpumask;
 124
 125         cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 126         ret = type ?
 127                 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
 128                 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
 129         buf[ret++] = '\n';
 130         buf[ret] = '\0';
 131         return ret;
 132 }
 133
 134 static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
 135                                         struct device_attribute *attr,
 136                                         char *buf)
 137 {
 138         return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
 139 }
 140
 141 static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
 142                                         struct device_attribute *attr,
 143                                         char *buf)
 144 {
 145         return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
 146 }
 147
 148 /* show resources */
 149 static ssize_t
 150 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 151 {
 152         struct pci_dev * pci_dev = to_pci_dev(dev);
 153         char * str = buf;
 154         int i;
 155         int max;
 156         resource_size_t start, end;
 157
 158         if (pci_dev->subordinate)
 159                 max = DEVICE_COUNT_RESOURCE;
 160         else
 161                 max = PCI_BRIDGE_RESOURCES;
 162
 163         for (i = 0; i < max; i++) {
 164                 struct resource *res =  &pci_dev->resource[i];
 165                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 166                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 167                                (unsigned long long)start,
 168                                (unsigned long long)end,
 169                                (unsigned long long)res->flags);
 170         }
 171         return (str - buf);
 172 }
 173
 174 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 175 {
 176         struct pci_dev *pci_dev = to_pci_dev(dev);
 177
 178         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 179                        pci_dev->vendor, pci_dev->device,
 180                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 181                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 182                        (u8)(pci_dev->class));
 183 }
 184
 185 static ssize_t is_enabled_store(struct device *dev,
 186                                 struct device_attribute *attr, const char *buf,
 187                                 size_t count)
 188 {
 189         struct pci_dev *pdev = to_pci_dev(dev);
 190         unsigned long val;
 191         ssize_t result = strict_strtoul(buf, 0, &val);
 192
 193         if (result < 0)
 194                 return result;
 195
 196         /* this can crash the machine when done on the "wrong" device */
 197         if (!capable(CAP_SYS_ADMIN))
 198                 return -EPERM;
 199
 200         if (!val) {
 201                 if (pci_is_enabled(pdev))
 202                         pci_disable_device(pdev);
 203                 else
 204                         result = -EIO;
 205         } else
 206                 result = pci_enable_device(pdev);
 207
 208         return result < 0 ? result : count;
 209 }
 210
 211 static ssize_t is_enabled_show(struct device *dev,
 212                                struct device_attribute *attr, char *buf)
 213 {
 214         struct pci_dev *pdev;
 215
 216         pdev = to_pci_dev (dev);
 217         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 218 }
 219
 220 #ifdef CONFIG_NUMA
 221 static ssize_t
 222 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         return sprintf (buf, "%d\n", dev->numa_node);
 225 }
 226 #endif
 227
 228 static ssize_t
 229 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
 230 {
 231         struct pci_dev *pdev = to_pci_dev(dev);
 232
 233         return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
 234 }
 235
 236 static ssize_t
 237 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
 238                                  char *buf)
 239 {
 240         return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
 241 }
 242
 243 static ssize_t
 244 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 245 {
 246         struct pci_dev *pdev = to_pci_dev(dev);
 247
 248         if (!pdev->subordinate)
 249                 return 0;
 250
 251         return sprintf (buf, "%u\n",
 252                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 253 }
 254
 255 static ssize_t
 256 msi_bus_store(struct device *dev, struct device_attribute *attr,
 257               const char *buf, size_t count)
 258 {
 259         struct pci_dev *pdev = to_pci_dev(dev);
 260         unsigned long val;
 261
 262         if (strict_strtoul(buf, 0, &val) < 0)
 263                 return -EINVAL;
 264
 265         /* bad things may happen if the no_msi flag is changed
 266          * while some drivers are loaded */
 267         if (!capable(CAP_SYS_ADMIN))
 268                 return -EPERM;
 269
 270         /* Maybe pci devices without subordinate busses shouldn't even have this
 271          * attribute in the first place?  */
 272         if (!pdev->subordinate)
 273                 return count;
 274
 275         /* Is the flag going to change, or keep the value it already had? */
 276         if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 277             !!val) {
 278                 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 279
 280                 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 281                          " bad things could happen\n", val ? "" : " not");
 282         }
 283
 284         return count;
 285 }
 286
 287 static DEFINE_MUTEX(pci_remove_rescan_mutex);
 288 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 289                                 size_t count)
 290 {
 291         unsigned long val;
 292         struct pci_bus *b = NULL;
 293
 294         if (strict_strtoul(buf, 0, &val) < 0)
 295                 return -EINVAL;
 296
 297         if (val) {
 298                 mutex_lock(&pci_remove_rescan_mutex);
 299                 while ((b = pci_find_next_bus(b)) != NULL)
 300                         pci_rescan_bus(b);
 301                 mutex_unlock(&pci_remove_rescan_mutex);
 302         }
 303         return count;
 304 }
 305
 306 struct bus_attribute pci_bus_attrs[] = {
 307         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
 308         __ATTR_NULL
 309 };
 310
 311 static ssize_t
 312 dev_rescan_store(struct device *dev, struct device_attribute *attr,
 313                  const char *buf, size_t count)
 314 {
 315         unsigned long val;
 316         struct pci_dev *pdev = to_pci_dev(dev);
 317
 318         if (strict_strtoul(buf, 0, &val) < 0)
 319                 return -EINVAL;
 320
 321         if (val) {
 322                 mutex_lock(&pci_remove_rescan_mutex);
 323                 pci_rescan_bus(pdev->bus);
 324                 mutex_unlock(&pci_remove_rescan_mutex);
 325         }
 326         return count;
 327 }
 328
 329 static void remove_callback(struct device *dev)
 330 {
 331         struct pci_dev *pdev = to_pci_dev(dev);
 332
 333         mutex_lock(&pci_remove_rescan_mutex);
 334         pci_stop_and_remove_bus_device(pdev);
 335         mutex_unlock(&pci_remove_rescan_mutex);
 336 }
 337
 338 static ssize_t
 339 remove_store(struct device *dev, struct device_attribute *dummy,
 340              const char *buf, size_t count)
 341 {
 342         int ret = 0;
 343         unsigned long val;
 344
 345         if (strict_strtoul(buf, 0, &val) < 0)
 346                 return -EINVAL;
 347
 348         /* An attribute cannot be unregistered by one of its own methods,
 349          * so we have to use this roundabout approach.
 350          */
 351         if (val)
 352                 ret = device_schedule_callback(dev, remove_callback);
 353         if (ret)
 354                 count = ret;
 355         return count;
 356 }
 357
 358 static ssize_t
 359 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 360                  const char *buf, size_t count)
 361 {
 362         unsigned long val;
 363         struct pci_bus *bus = to_pci_bus(dev);
 364
 365         if (strict_strtoul(buf, 0, &val) < 0)
 366                 return -EINVAL;
 367
 368         if (val) {
 369                 mutex_lock(&pci_remove_rescan_mutex);
 370                 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
 371                         pci_rescan_bus_bridge_resize(bus->self);
 372                 else
 373                         pci_rescan_bus(bus);
 374                 mutex_unlock(&pci_remove_rescan_mutex);
 375         }
 376         return count;
 377 }
 378
 379 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 380 static ssize_t d3cold_allowed_store(struct device *dev,
 381                                     struct device_attribute *attr,
 382                                     const char *buf, size_t count)
 383 {
 384         struct pci_dev *pdev = to_pci_dev(dev);
 385         unsigned long val;
 386
 387         if (strict_strtoul(buf, 0, &val) < 0)
 388                 return -EINVAL;
 389
 390         pdev->d3cold_allowed = !!val;
 391         pm_runtime_resume(dev);
 392
 393         return count;
 394 }
 395
 396 static ssize_t d3cold_allowed_show(struct device *dev,
 397                                    struct device_attribute *attr, char *buf)
 398 {
 399         struct pci_dev *pdev = to_pci_dev(dev);
 400         return sprintf (buf, "%u\n", pdev->d3cold_allowed);
 401 }
 402 #endif
 403
 404 #ifdef CONFIG_PCI_IOV
 405 static ssize_t sriov_totalvfs_show(struct device *dev,
 406                                    struct device_attribute *attr,
 407                                    char *buf)
 408 {
 409         struct pci_dev *pdev = to_pci_dev(dev);
 410
 411         return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
 412 }
 413
 414
 415 static ssize_t sriov_numvfs_show(struct device *dev,
 416                                  struct device_attribute *attr,
 417                                  char *buf)
 418 {
 419         struct pci_dev *pdev = to_pci_dev(dev);
 420
 421         return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
 422 }
 423
 424 /*
 425  * num_vfs > 0; number of VFs to enable
 426  * num_vfs = 0; disable all VFs
 427  *
 428  * Note: SRIOV spec doesn't allow partial VF
 429  *       disable, so it's all or none.
 430  */
 431 static ssize_t sriov_numvfs_store(struct device *dev,
 432                                   struct device_attribute *attr,
 433                                   const char *buf, size_t count)
 434 {
 435         struct pci_dev *pdev = to_pci_dev(dev);
 436         int ret;
 437         u16 num_vfs;
 438
 439         ret = kstrtou16(buf, 0, &num_vfs);
 440         if (ret < 0)
 441                 return ret;
 442
 443         if (num_vfs > pci_sriov_get_totalvfs(pdev))
 444                 return -ERANGE;
 445
 446         if (num_vfs == pdev->sriov->num_VFs)
 447                 return count;           /* no change */
 448
 449         /* is PF driver loaded w/callback */
 450         if (!pdev->driver || !pdev->driver->sriov_configure) {
 451                 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
 452                 return -ENOSYS;
 453         }
 454
 455         if (num_vfs == 0) {
 456                 /* disable VFs */
 457                 ret = pdev->driver->sriov_configure(pdev, 0);
 458                 if (ret < 0)
 459                         return ret;
 460                 return count;
 461         }
 462
 463         /* enable VFs */
 464         if (pdev->sriov->num_VFs) {
 465                 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
 466                          pdev->sriov->num_VFs, num_vfs);
 467                 return -EBUSY;
 468         }
 469
 470         ret = pdev->driver->sriov_configure(pdev, num_vfs);
 471         if (ret < 0)
 472                 return ret;
 473
 474         if (ret != num_vfs)
 475                 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
 476                          num_vfs, ret);
 477
 478         return count;
 479 }
 480
 481 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
 482 static struct device_attribute sriov_numvfs_attr =
 483                 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
 484                        sriov_numvfs_show, sriov_numvfs_store);
 485 #endif /* CONFIG_PCI_IOV */
 486
 487 struct device_attribute pci_dev_attrs[] = {
 488         __ATTR_RO(resource),
 489         __ATTR_RO(vendor),
 490         __ATTR_RO(device),
 491         __ATTR_RO(subsystem_vendor),
 492         __ATTR_RO(subsystem_device),
 493         __ATTR_RO(class),
 494         __ATTR_RO(irq),
 495         __ATTR_RO(local_cpus),
 496         __ATTR_RO(local_cpulist),
 497         __ATTR_RO(modalias),
 498 #ifdef CONFIG_NUMA
 499         __ATTR_RO(numa_node),
 500 #endif
 501         __ATTR_RO(dma_mask_bits),
 502         __ATTR_RO(consistent_dma_mask_bits),
 503         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 504         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 505                 broken_parity_status_show,broken_parity_status_store),
 506         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 507         __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
 508         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
 509 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 510         __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
 511 #endif
 512         __ATTR_NULL,
 513 };
 514
 515 struct device_attribute pcibus_dev_attrs[] = {
 516         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
 517         __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
 518         __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
 519         __ATTR_NULL,
 520 };
 521
 522 static ssize_t
 523 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 524 {
 525         struct pci_dev *pdev = to_pci_dev(dev);
 526         struct pci_dev *vga_dev = vga_default_device();
 527
 528         if (vga_dev)
 529                 return sprintf(buf, "%u\n", (pdev == vga_dev));
 530
 531         return sprintf(buf, "%u\n",
 532                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 533                    IORESOURCE_ROM_SHADOW));
 534 }
 535 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 536
 537 static ssize_t
 538 pci_read_config(struct file *filp, struct kobject *kobj,
 539                 struct bin_attribute *bin_attr,
 540                 char *buf, loff_t off, size_t count)
 541 {
 542         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 543         unsigned int size = 64;
 544         loff_t init_off = off;
 545         u8 *data = (u8*) buf;
 546
 547         /* Several chips lock up trying to read undefined config space */
 548         if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
 549                 size = dev->cfg_size;
 550         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 551                 size = 128;
 552         }
 553
 554         if (off > size)
 555                 return 0;
 556         if (off + count > size) {
 557                 size -= off;
 558                 count = size;
 559         } else {
 560                 size = count;
 561         }
 562
 563         pci_config_pm_runtime_get(dev);
 564
 565         if ((off & 1) && size) {
 566                 u8 val;
 567                 pci_user_read_config_byte(dev, off, &val);
 568                 data[off - init_off] = val;
 569                 off++;
 570                 size--;
 571         }
 572
 573         if ((off & 3) && size > 2) {
 574                 u16 val;
 575                 pci_user_read_config_word(dev, off, &val);
 576                 data[off - init_off] = val & 0xff;
 577                 data[off - init_off + 1] = (val >> 8) & 0xff;
 578                 off += 2;
 579                 size -= 2;
 580         }
 581
 582         while (size > 3) {
 583                 u32 val;
 584                 pci_user_read_config_dword(dev, off, &val);
 585                 data[off - init_off] = val & 0xff;
 586                 data[off - init_off + 1] = (val >> 8) & 0xff;
 587                 data[off - init_off + 2] = (val >> 16) & 0xff;
 588                 data[off - init_off + 3] = (val >> 24) & 0xff;
 589                 off += 4;
 590                 size -= 4;
 591         }
 592
 593         if (size >= 2) {
 594                 u16 val;
 595                 pci_user_read_config_word(dev, off, &val);
 596                 data[off - init_off] = val & 0xff;
 597                 data[off - init_off + 1] = (val >> 8) & 0xff;
 598                 off += 2;
 599                 size -= 2;
 600         }
 601
 602         if (size > 0) {
 603                 u8 val;
 604                 pci_user_read_config_byte(dev, off, &val);
 605                 data[off - init_off] = val;
 606                 off++;
 607                 --size;
 608         }
 609
 610         pci_config_pm_runtime_put(dev);
 611
 612         return count;
 613 }
 614
 615 static ssize_t
 616 pci_write_config(struct file* filp, struct kobject *kobj,
 617                  struct bin_attribute *bin_attr,
 618                  char *buf, loff_t off, size_t count)
 619 {
 620         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 621         unsigned int size = count;
 622         loff_t init_off = off;
 623         u8 *data = (u8*) buf;
 624
 625         if (off > dev->cfg_size)
 626                 return 0;
 627         if (off + count > dev->cfg_size) {
 628                 size = dev->cfg_size - off;
 629                 count = size;
 630         }
 631
 632         pci_config_pm_runtime_get(dev);
 633
 634         if ((off & 1) && size) {
 635                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 636                 off++;
 637                 size--;
 638         }
 639
 640         if ((off & 3) && size > 2) {
 641                 u16 val = data[off - init_off];
 642                 val |= (u16) data[off - init_off + 1] << 8;
 643                 pci_user_write_config_word(dev, off, val);
 644                 off += 2;
 645                 size -= 2;
 646         }
 647
 648         while (size > 3) {
 649                 u32 val = data[off - init_off];
 650                 val |= (u32) data[off - init_off + 1] << 8;
 651                 val |= (u32) data[off - init_off + 2] << 16;
 652                 val |= (u32) data[off - init_off + 3] << 24;
 653                 pci_user_write_config_dword(dev, off, val);
 654                 off += 4;
 655                 size -= 4;
 656         }
 657
 658         if (size >= 2) {
 659                 u16 val = data[off - init_off];
 660                 val |= (u16) data[off - init_off + 1] << 8;
 661                 pci_user_write_config_word(dev, off, val);
 662                 off += 2;
 663                 size -= 2;
 664         }
 665
 666         if (size) {
 667                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 668                 off++;
 669                 --size;
 670         }
 671
 672         pci_config_pm_runtime_put(dev);
 673
 674         return count;
 675 }
 676
 677 static ssize_t
 678 read_vpd_attr(struct file *filp, struct kobject *kobj,
 679               struct bin_attribute *bin_attr,
 680               char *buf, loff_t off, size_t count)
 681 {
 682         struct pci_dev *dev =
 683                 to_pci_dev(container_of(kobj, struct device, kobj));
 684
 685         if (off > bin_attr->size)
 686                 count = 0;
 687         else if (count > bin_attr->size - off)
 688                 count = bin_attr->size - off;
 689
 690         return pci_read_vpd(dev, off, count, buf);
 691 }
 692
 693 static ssize_t
 694 write_vpd_attr(struct file *filp, struct kobject *kobj,
 695                struct bin_attribute *bin_attr,
 696                char *buf, loff_t off, size_t count)
 697 {
 698         struct pci_dev *dev =
 699                 to_pci_dev(container_of(kobj, struct device, kobj));
 700
 701         if (off > bin_attr->size)
 702                 count = 0;
 703         else if (count > bin_attr->size - off)
 704                 count = bin_attr->size - off;
 705
 706         return pci_write_vpd(dev, off, count, buf);
 707 }
 708
 709 #ifdef HAVE_PCI_LEGACY
 710 /**
 711  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 712  * @filp: open sysfs file
 713  * @kobj: kobject corresponding to file to read from
 714  * @bin_attr: struct bin_attribute for this file
 715  * @buf: buffer to store results
 716  * @off: offset into legacy I/O port space
 717  * @count: number of bytes to read
 718  *
 719  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 720  * callback routine (pci_legacy_read).
 721  */
 722 static ssize_t
 723 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 724                    struct bin_attribute *bin_attr,
 725                    char *buf, loff_t off, size_t count)
 726 {
 727         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 728                                                       struct device,
 729                                                       kobj));
 730
 731         /* Only support 1, 2 or 4 byte accesses */
 732         if (count != 1 && count != 2 && count != 4)
 733                 return -EINVAL;
 734
 735         return pci_legacy_read(bus, off, (u32 *)buf, count);
 736 }
 737
 738 /**
 739  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 740  * @filp: open sysfs file
 741  * @kobj: kobject corresponding to file to read from
 742  * @bin_attr: struct bin_attribute for this file
 743  * @buf: buffer containing value to be written
 744  * @off: offset into legacy I/O port space
 745  * @count: number of bytes to write
 746  *
 747  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 748  * callback routine (pci_legacy_write).
 749  */
 750 static ssize_t
 751 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 752                     struct bin_attribute *bin_attr,
 753                     char *buf, loff_t off, size_t count)
 754 {
 755         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 756                                                       struct device,
 757                                                       kobj));
 758         /* Only support 1, 2 or 4 byte accesses */
 759         if (count != 1 && count != 2 && count != 4)
 760                 return -EINVAL;
 761
 762         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 763 }
 764
 765 /**
 766  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 767  * @filp: open sysfs file
 768  * @kobj: kobject corresponding to device to be mapped
 769  * @attr: struct bin_attribute for this file
 770  * @vma: struct vm_area_struct passed to mmap
 771  *
 772  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 773  * legacy memory space (first meg of bus space) into application virtual
 774  * memory space.
 775  */
 776 static int
 777 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 778                     struct bin_attribute *attr,
 779                     struct vm_area_struct *vma)
 780 {
 781         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 782                                                       struct device,
 783                                                       kobj));
 784
 785         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 786 }
 787
 788 /**
 789  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 790  * @filp: open sysfs file
 791  * @kobj: kobject corresponding to device to be mapped
 792  * @attr: struct bin_attribute for this file
 793  * @vma: struct vm_area_struct passed to mmap
 794  *
 795  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 796  * legacy IO space (first meg of bus space) into application virtual
 797  * memory space. Returns -ENOSYS if the operation isn't supported
 798  */
 799 static int
 800 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 801                    struct bin_attribute *attr,
 802                    struct vm_area_struct *vma)
 803 {
 804         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 805                                                       struct device,
 806                                                       kobj));
 807
 808         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 809 }
 810
 811 /**
 812  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 813  * @b: bus to create files under
 814  * @mmap_type: I/O port or memory
 815  *
 816  * Stub implementation. Can be overridden by arch if necessary.
 817  */
 818 void __weak
 819 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 820 {
 821         return;
 822 }
 823
 824 /**
 825  * pci_create_legacy_files - create legacy I/O port and memory files
 826  * @b: bus to create files under
 827  *
 828  * Some platforms allow access to legacy I/O port and ISA memory space on
 829  * a per-bus basis.  This routine creates the files and ties them into
 830  * their associated read, write and mmap files from pci-sysfs.c
 831  *
 832  * On error unwind, but don't propagate the error to the caller
 833  * as it is ok to set up the PCI bus without these files.
 834  */
 835 void pci_create_legacy_files(struct pci_bus *b)
 836 {
 837         int error;
 838
 839         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 840                                GFP_ATOMIC);
 841         if (!b->legacy_io)
 842                 goto kzalloc_err;
 843
 844         sysfs_bin_attr_init(b->legacy_io);
 845         b->legacy_io->attr.name = "legacy_io";
 846         b->legacy_io->size = 0xffff;
 847         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 848         b->legacy_io->read = pci_read_legacy_io;
 849         b->legacy_io->write = pci_write_legacy_io;
 850         b->legacy_io->mmap = pci_mmap_legacy_io;
 851         pci_adjust_legacy_attr(b, pci_mmap_io);
 852         error = device_create_bin_file(&b->dev, b->legacy_io);
 853         if (error)
 854                 goto legacy_io_err;
 855
 856         /* Allocated above after the legacy_io struct */
 857         b->legacy_mem = b->legacy_io + 1;
 858         sysfs_bin_attr_init(b->legacy_mem);
 859         b->legacy_mem->attr.name = "legacy_mem";
 860         b->legacy_mem->size = 1024*1024;
 861         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 862         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 863         pci_adjust_legacy_attr(b, pci_mmap_mem);
 864         error = device_create_bin_file(&b->dev, b->legacy_mem);
 865         if (error)
 866                 goto legacy_mem_err;
 867
 868         return;
 869
 870 legacy_mem_err:
 871         device_remove_bin_file(&b->dev, b->legacy_io);
 872 legacy_io_err:
 873         kfree(b->legacy_io);
 874         b->legacy_io = NULL;
 875 kzalloc_err:
 876         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 877                "and ISA memory resources to sysfs\n");
 878         return;
 879 }
 880
 881 void pci_remove_legacy_files(struct pci_bus *b)
 882 {
 883         if (b->legacy_io) {
 884                 device_remove_bin_file(&b->dev, b->legacy_io);
 885                 device_remove_bin_file(&b->dev, b->legacy_mem);
 886                 kfree(b->legacy_io); /* both are allocated here */
 887         }
 888 }
 889 #endif /* HAVE_PCI_LEGACY */
 890
 891 #ifdef HAVE_PCI_MMAP
 892
 893 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 894                   enum pci_mmap_api mmap_api)
 895 {
 896         unsigned long nr, start, size, pci_start;
 897
 898         if (pci_resource_len(pdev, resno) == 0)
 899                 return 0;
 900         nr = vma_pages(vma);
 901         start = vma->vm_pgoff;
 902         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 903         pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 904                         pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 905         if (start >= pci_start && start < pci_start + size &&
 906                         start + nr <= pci_start + size)
 907                 return 1;
 908         return 0;
 909 }
 910
 911 /**
 912  * pci_mmap_resource - map a PCI resource into user memory space
 913  * @kobj: kobject for mapping
 914  * @attr: struct bin_attribute for the file being mapped
 915  * @vma: struct vm_area_struct passed into the mmap
 916  * @write_combine: 1 for write_combine mapping
 917  *
 918  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 919  */
 920 static int
 921 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 922                   struct vm_area_struct *vma, int write_combine)
 923 {
 924         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 925                                                        struct device, kobj));
 926         struct resource *res = attr->private;
 927         enum pci_mmap_state mmap_type;
 928         resource_size_t start, end;
 929         int i;
 930
 931         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 932                 if (res == &pdev->resource[i])
 933                         break;
 934         if (i >= PCI_ROM_RESOURCE)
 935                 return -ENODEV;
 936
 937         if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
 938                 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
 939                         "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
 940                         current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
 941                         pci_name(pdev), i,
 942                         (u64)pci_resource_start(pdev, i),
 943                         (u64)pci_resource_len(pdev, i));
 944                 return -EINVAL;
 945         }
 946
 947         /* pci_mmap_page_range() expects the same kind of entry as coming
 948          * from /proc/bus/pci/ which is a "user visible" value. If this is
 949          * different from the resource itself, arch will do necessary fixup.
 950          */
 951         pci_resource_to_user(pdev, i, res, &start, &end);
 952         vma->vm_pgoff += start >> PAGE_SHIFT;
 953         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 954
 955         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 956                 return -EINVAL;
 957
 958         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 959 }
 960
 961 static int
 962 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
 963                      struct bin_attribute *attr,
 964                      struct vm_area_struct *vma)
 965 {
 966         return pci_mmap_resource(kobj, attr, vma, 0);
 967 }
 968
 969 static int
 970 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
 971                      struct bin_attribute *attr,
 972                      struct vm_area_struct *vma)
 973 {
 974         return pci_mmap_resource(kobj, attr, vma, 1);
 975 }
 976
 977 static ssize_t
 978 pci_resource_io(struct file *filp, struct kobject *kobj,
 979                 struct bin_attribute *attr, char *buf,
 980                 loff_t off, size_t count, bool write)
 981 {
 982         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 983                                                        struct device, kobj));
 984         struct resource *res = attr->private;
 985         unsigned long port = off;
 986         int i;
 987
 988         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 989                 if (res == &pdev->resource[i])
 990                         break;
 991         if (i >= PCI_ROM_RESOURCE)
 992                 return -ENODEV;
 993
 994         port += pci_resource_start(pdev, i);
 995
 996         if (port > pci_resource_end(pdev, i))
 997                 return 0;
 998
 999         if (port + count - 1 > pci_resource_end(pdev, i))
1000                 return -EINVAL;
1001
1002         switch (count) {
1003         case 1:
1004                 if (write)
1005                         outb(*(u8 *)buf, port);
1006                 else
1007                         *(u8 *)buf = inb(port);
1008                 return 1;
1009         case 2:
1010                 if (write)
1011                         outw(*(u16 *)buf, port);
1012                 else
1013                         *(u16 *)buf = inw(port);
1014                 return 2;
1015         case 4:
1016                 if (write)
1017                         outl(*(u32 *)buf, port);
1018                 else
1019                         *(u32 *)buf = inl(port);
1020                 return 4;
1021         }
1022         return -EINVAL;
1023 }
1024
1025 static ssize_t
1026 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1027                      struct bin_attribute *attr, char *buf,
1028                      loff_t off, size_t count)
1029 {
1030         return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1031 }
1032
1033 static ssize_t
1034 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1035                       struct bin_attribute *attr, char *buf,
1036                       loff_t off, size_t count)
1037 {
1038         return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1039 }
1040
1041 /**
1042  * pci_remove_resource_files - cleanup resource files
1043  * @pdev: dev to cleanup
1044  *
1045  * If we created resource files for @pdev, remove them from sysfs and
1046  * free their resources.
1047  */
1048 static void
1049 pci_remove_resource_files(struct pci_dev *pdev)
1050 {
1051         int i;
1052
1053         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1054                 struct bin_attribute *res_attr;
1055
1056                 res_attr = pdev->res_attr[i];
1057                 if (res_attr) {
1058                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1059                         kfree(res_attr);
1060                 }
1061
1062                 res_attr = pdev->res_attr_wc[i];
1063                 if (res_attr) {
1064                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1065                         kfree(res_attr);
1066                 }
1067         }
1068 }
1069
1070 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1071 {
1072         /* allocate attribute structure, piggyback attribute name */
1073         int name_len = write_combine ? 13 : 10;
1074         struct bin_attribute *res_attr;
1075         int retval;
1076
1077         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1078         if (res_attr) {
1079                 char *res_attr_name = (char *)(res_attr + 1);
1080
1081                 sysfs_bin_attr_init(res_attr);
1082                 if (write_combine) {
1083                         pdev->res_attr_wc[num] = res_attr;
1084                         sprintf(res_attr_name, "resource%d_wc", num);
1085                         res_attr->mmap = pci_mmap_resource_wc;
1086                 } else {
1087                         pdev->res_attr[num] = res_attr;
1088                         sprintf(res_attr_name, "resource%d", num);
1089                         res_attr->mmap = pci_mmap_resource_uc;
1090                 }
1091                 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1092                         res_attr->read = pci_read_resource_io;
1093                         res_attr->write = pci_write_resource_io;
1094                 }
1095                 res_attr->attr.name = res_attr_name;
1096                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1097                 res_attr->size = pci_resource_len(pdev, num);
1098                 res_attr->private = &pdev->resource[num];
1099                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1100         } else
1101                 retval = -ENOMEM;
1102
1103         return retval;
1104 }
1105
1106 /**
1107  * pci_create_resource_files - create resource files in sysfs for @dev
1108  * @pdev: dev in question
1109  *
1110  * Walk the resources in @pdev creating files for each resource available.
1111  */
1112 static int pci_create_resource_files(struct pci_dev *pdev)
1113 {
1114         int i;
1115         int retval;
1116
1117         /* Expose the PCI resources from this device as files */
1118         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1119
1120                 /* skip empty resources */
1121                 if (!pci_resource_len(pdev, i))
1122                         continue;
1123
1124                 retval = pci_create_attr(pdev, i, 0);
1125                 /* for prefetchable resources, create a WC mappable file */
1126                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1127                         retval = pci_create_attr(pdev, i, 1);
1128
1129                 if (retval) {
1130                         pci_remove_resource_files(pdev);
1131                         return retval;
1132                 }
1133         }
1134         return 0;
1135 }
1136 #else /* !HAVE_PCI_MMAP */
1137 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1138 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1139 #endif /* HAVE_PCI_MMAP */
1140
1141 /**
1142  * pci_write_rom - used to enable access to the PCI ROM display
1143  * @filp: sysfs file
1144  * @kobj: kernel object handle
1145  * @bin_attr: struct bin_attribute for this file
1146  * @buf: user input
1147  * @off: file offset
1148  * @count: number of byte in input
1149  *
1150  * writing anything except 0 enables it
1151  */
1152 static ssize_t
1153 pci_write_rom(struct file *filp, struct kobject *kobj,
1154               struct bin_attribute *bin_attr,
1155               char *buf, loff_t off, size_t count)
1156 {
1157         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1158
1159         if ((off ==  0) && (*buf == '0') && (count == 2))
1160                 pdev->rom_attr_enabled = 0;
1161         else
1162                 pdev->rom_attr_enabled = 1;
1163
1164         return count;
1165 }
1166
1167 /**
1168  * pci_read_rom - read a PCI ROM
1169  * @filp: sysfs file
1170  * @kobj: kernel object handle
1171  * @bin_attr: struct bin_attribute for this file
1172  * @buf: where to put the data we read from the ROM
1173  * @off: file offset
1174  * @count: number of bytes to read
1175  *
1176  * Put @count bytes starting at @off into @buf from the ROM in the PCI
1177  * device corresponding to @kobj.
1178  */
1179 static ssize_t
1180 pci_read_rom(struct file *filp, struct kobject *kobj,
1181              struct bin_attribute *bin_attr,
1182              char *buf, loff_t off, size_t count)
1183 {
1184         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1185         void __iomem *rom;
1186         size_t size;
1187
1188         if (!pdev->rom_attr_enabled)
1189                 return -EINVAL;
1190
1191         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1192         if (!rom || !size)
1193                 return -EIO;
1194
1195         if (off >= size)
1196                 count = 0;
1197         else {
1198                 if (off + count > size)
1199                         count = size - off;
1200
1201                 memcpy_fromio(buf, rom + off, count);
1202         }
1203         pci_unmap_rom(pdev, rom);
1204
1205         return count;
1206 }
1207
1208 static struct bin_attribute pci_config_attr = {
1209         .attr = {
1210                 .name = "config",
1211                 .mode = S_IRUGO | S_IWUSR,
1212         },
1213         .size = PCI_CFG_SPACE_SIZE,
1214         .read = pci_read_config,
1215         .write = pci_write_config,
1216 };
1217
1218 static struct bin_attribute pcie_config_attr = {
1219         .attr = {
1220                 .name = "config",
1221                 .mode = S_IRUGO | S_IWUSR,
1222         },
1223         .size = PCI_CFG_SPACE_EXP_SIZE,
1224         .read = pci_read_config,
1225         .write = pci_write_config,
1226 };
1227
1228 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1229 {
1230         return 0;
1231 }
1232
1233 static ssize_t reset_store(struct device *dev,
1234                            struct device_attribute *attr, const char *buf,
1235                            size_t count)
1236 {
1237         struct pci_dev *pdev = to_pci_dev(dev);
1238         unsigned long val;
1239         ssize_t result = strict_strtoul(buf, 0, &val);
1240
1241         if (result < 0)
1242                 return result;
1243
1244         if (val != 1)
1245                 return -EINVAL;
1246
1247         result = pci_reset_function(pdev);
1248         if (result < 0)
1249                 return result;
1250
1251         return count;
1252 }
1253
1254 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1255
1256 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1257 {
1258         int retval;
1259         struct bin_attribute *attr;
1260
1261         /* If the device has VPD, try to expose it in sysfs. */
1262         if (dev->vpd) {
1263                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1264                 if (!attr)
1265                         return -ENOMEM;
1266
1267                 sysfs_bin_attr_init(attr);
1268                 attr->size = dev->vpd->len;
1269                 attr->attr.name = "vpd";
1270                 attr->attr.mode = S_IRUSR | S_IWUSR;
1271                 attr->read = read_vpd_attr;
1272                 attr->write = write_vpd_attr;
1273                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1274                 if (retval) {
1275                         kfree(attr);
1276                         return retval;
1277                 }
1278                 dev->vpd->attr = attr;
1279         }
1280
1281         /* Active State Power Management */
1282         pcie_aspm_create_sysfs_dev_files(dev);
1283
1284         if (!pci_probe_reset_function(dev)) {
1285                 retval = device_create_file(&dev->dev, &reset_attr);
1286                 if (retval)
1287                         goto error;
1288                 dev->reset_fn = 1;
1289         }
1290         return 0;
1291
1292 error:
1293         pcie_aspm_remove_sysfs_dev_files(dev);
1294         if (dev->vpd && dev->vpd->attr) {
1295                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1296                 kfree(dev->vpd->attr);
1297         }
1298
1299         return retval;
1300 }
1301
1302 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1303 {
1304         int retval;
1305         int rom_size = 0;
1306         struct bin_attribute *attr;
1307
1308         if (!sysfs_initialized)
1309                 return -EACCES;
1310
1311         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1312                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1313         else
1314                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1315         if (retval)
1316                 goto err;
1317
1318         retval = pci_create_resource_files(pdev);
1319         if (retval)
1320                 goto err_config_file;
1321
1322         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1323                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1324         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1325                 rom_size = 0x20000;
1326
1327         /* If the device has a ROM, try to expose it in sysfs. */
1328         if (rom_size) {
1329                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1330                 if (!attr) {
1331                         retval = -ENOMEM;
1332                         goto err_resource_files;
1333                 }
1334                 sysfs_bin_attr_init(attr);
1335                 attr->size = rom_size;
1336                 attr->attr.name = "rom";
1337                 attr->attr.mode = S_IRUSR | S_IWUSR;
1338                 attr->read = pci_read_rom;
1339                 attr->write = pci_write_rom;
1340                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1341                 if (retval) {
1342                         kfree(attr);
1343                         goto err_resource_files;
1344                 }
1345                 pdev->rom_attr = attr;
1346         }
1347
1348         /* add platform-specific attributes */
1349         retval = pcibios_add_platform_entries(pdev);
1350         if (retval)
1351                 goto err_rom_file;
1352
1353         /* add sysfs entries for various capabilities */
1354         retval = pci_create_capabilities_sysfs(pdev);
1355         if (retval)
1356                 goto err_rom_file;
1357
1358         pci_create_firmware_label_files(pdev);
1359
1360         return 0;
1361
1362 err_rom_file:
1363         if (rom_size) {
1364                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1365                 kfree(pdev->rom_attr);
1366                 pdev->rom_attr = NULL;
1367         }
1368 err_resource_files:
1369         pci_remove_resource_files(pdev);
1370 err_config_file:
1371         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1372                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1373         else
1374                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1375 err:
1376         return retval;
1377 }
1378
1379 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1380 {
1381         if (dev->vpd && dev->vpd->attr) {
1382                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1383                 kfree(dev->vpd->attr);
1384         }
1385
1386         pcie_aspm_remove_sysfs_dev_files(dev);
1387         if (dev->reset_fn) {
1388                 device_remove_file(&dev->dev, &reset_attr);
1389                 dev->reset_fn = 0;
1390         }
1391 }
1392
1393 /**
1394  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1395  * @pdev: device whose entries we should free
1396  *
1397  * Cleanup when @pdev is removed from sysfs.
1398  */
1399 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1400 {
1401         int rom_size = 0;
1402
1403         if (!sysfs_initialized)
1404                 return;
1405
1406         pci_remove_capabilities_sysfs(pdev);
1407
1408         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1409                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1410         else
1411                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1412
1413         pci_remove_resource_files(pdev);
1414
1415         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1416                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1417         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1418                 rom_size = 0x20000;
1419
1420         if (rom_size && pdev->rom_attr) {
1421                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1422                 kfree(pdev->rom_attr);
1423         }
1424
1425         pci_remove_firmware_label_files(pdev);
1426
1427 }
1428
1429 static int __init pci_sysfs_init(void)
1430 {
1431         struct pci_dev *pdev = NULL;
1432         int retval;
1433
1434         sysfs_initialized = 1;
1435         for_each_pci_dev(pdev) {
1436                 retval = pci_create_sysfs_dev_files(pdev);
1437                 if (retval) {
1438                         pci_dev_put(pdev);
1439                         return retval;
1440                 }
1441         }
1442
1443         return 0;
1444 }
1445
1446 late_initcall(pci_sysfs_init);
1447
1448 static struct attribute *pci_dev_dev_attrs[] = {
1449         &vga_attr.attr,
1450         NULL,
1451 };
1452
1453 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1454                                                 struct attribute *a, int n)
1455 {
1456         struct device *dev = container_of(kobj, struct device, kobj);
1457         struct pci_dev *pdev = to_pci_dev(dev);
1458
1459         if (a == &vga_attr.attr)
1460                 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1461                         return 0;
1462
1463         return a->mode;
1464 }
1465
1466 #ifdef CONFIG_PCI_IOV
1467 static struct attribute *sriov_dev_attrs[] = {
1468         &sriov_totalvfs_attr.attr,
1469         &sriov_numvfs_attr.attr,
1470         NULL,
1471 };
1472
1473 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1474                                          struct attribute *a, int n)
1475 {
1476         struct device *dev = container_of(kobj, struct device, kobj);
1477
1478         if (!dev_is_pf(dev))
1479                 return 0;
1480
1481         return a->mode;
1482 }
1483
1484 static struct attribute_group sriov_dev_attr_group = {
1485         .attrs = sriov_dev_attrs,
1486         .is_visible = sriov_attrs_are_visible,
1487 };
1488 #endif /* CONFIG_PCI_IOV */
1489
1490 static struct attribute_group pci_dev_attr_group = {
1491         .attrs = pci_dev_dev_attrs,
1492         .is_visible = pci_dev_attrs_are_visible,
1493 };
1494
1495 static const struct attribute_group *pci_dev_attr_groups[] = {
1496         &pci_dev_attr_group,
1497 #ifdef CONFIG_PCI_IOV
1498         &sriov_dev_attr_group,
1499 #endif
1500         NULL,
1501 };
1502
1503 struct device_type pci_dev_type = {
1504         .groups = pci_dev_attr_groups,
1505 };