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