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/pci.h>
  20 #include <linux/stat.h>
  21 #include <linux/topology.h>
  22 #include <linux/mm.h>
  23 #include <linux/capability.h>
  24 #include <linux/pci-aspm.h>
  25 #include "pci.h"
  26
  27 static int sysfs_initialized;   /* = 0 */
  28
  29 /* show configuration fields */
  30 #define pci_config_attr(field, format_string)                           \
  31 static ssize_t                                                          \
  32 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  33 {                                                                       \
  34         struct pci_dev *pdev;                                           \
  35                                                                         \
  36         pdev = to_pci_dev (dev);                                        \
  37         return sprintf (buf, format_string, pdev->field);               \
  38 }
  39
  40 pci_config_attr(vendor, "0x%04x\n");
  41 pci_config_attr(device, "0x%04x\n");
  42 pci_config_attr(subsystem_vendor, "0x%04x\n");
  43 pci_config_attr(subsystem_device, "0x%04x\n");
  44 pci_config_attr(class, "0x%06x\n");
  45 pci_config_attr(irq, "%u\n");
  46
  47 static ssize_t broken_parity_status_show(struct device *dev,
  48                                          struct device_attribute *attr,
  49                                          char *buf)
  50 {
  51         struct pci_dev *pdev = to_pci_dev(dev);
  52         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  53 }
  54
  55 static ssize_t broken_parity_status_store(struct device *dev,
  56                                           struct device_attribute *attr,
  57                                           const char *buf, size_t count)
  58 {
  59         struct pci_dev *pdev = to_pci_dev(dev);
  60         ssize_t consumed = -EINVAL;
  61
  62         if ((count > 0) && (*buf == '0' || *buf == '1')) {
  63                 pdev->broken_parity_status = *buf == '1' ? 1 : 0;
  64                 consumed = count;
  65         }
  66         return consumed;
  67 }
  68
  69 static ssize_t local_cpus_show(struct device *dev,
  70                         struct device_attribute *attr, char *buf)
  71 {
  72         cpumask_t mask;
  73         int len;
  74
  75         mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
  76         len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  77         buf[len++] = '\n';
  78         buf[len] = '\0';
  79         return len;
  80 }
  81
  82
  83 static ssize_t local_cpulist_show(struct device *dev,
  84                         struct device_attribute *attr, char *buf)
  85 {
  86         cpumask_t mask;
  87         int len;
  88
  89         mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
  90         len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
  91         buf[len++] = '\n';
  92         buf[len] = '\0';
  93         return len;
  94 }
  95
  96 /* show resources */
  97 static ssize_t
  98 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
  99 {
 100         struct pci_dev * pci_dev = to_pci_dev(dev);
 101         char * str = buf;
 102         int i;
 103         int max = 7;
 104         resource_size_t start, end;
 105
 106         if (pci_dev->subordinate)
 107                 max = DEVICE_COUNT_RESOURCE;
 108
 109         for (i = 0; i < max; i++) {
 110                 struct resource *res =  &pci_dev->resource[i];
 111                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 112                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 113                                (unsigned long long)start,
 114                                (unsigned long long)end,
 115                                (unsigned long long)res->flags);
 116         }
 117         return (str - buf);
 118 }
 119
 120 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 121 {
 122         struct pci_dev *pci_dev = to_pci_dev(dev);
 123
 124         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 125                        pci_dev->vendor, pci_dev->device,
 126                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 127                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 128                        (u8)(pci_dev->class));
 129 }
 130
 131 static ssize_t is_enabled_store(struct device *dev,
 132                                 struct device_attribute *attr, const char *buf,
 133                                 size_t count)
 134 {
 135         ssize_t result = -EINVAL;
 136         struct pci_dev *pdev = to_pci_dev(dev);
 137
 138         /* this can crash the machine when done on the "wrong" device */
 139         if (!capable(CAP_SYS_ADMIN))
 140                 return count;
 141
 142         if (*buf == '0') {
 143                 if (atomic_read(&pdev->enable_cnt) != 0)
 144                         pci_disable_device(pdev);
 145                 else
 146                         result = -EIO;
 147         } else if (*buf == '1')
 148                 result = pci_enable_device(pdev);
 149
 150         return result < 0 ? result : count;
 151 }
 152
 153 static ssize_t is_enabled_show(struct device *dev,
 154                                struct device_attribute *attr, char *buf)
 155 {
 156         struct pci_dev *pdev;
 157
 158         pdev = to_pci_dev (dev);
 159         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 160 }
 161
 162 #ifdef CONFIG_NUMA
 163 static ssize_t
 164 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 165 {
 166         return sprintf (buf, "%d\n", dev->numa_node);
 167 }
 168 #endif
 169
 170 static ssize_t
 171 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 172 {
 173         struct pci_dev *pdev = to_pci_dev(dev);
 174
 175         if (!pdev->subordinate)
 176                 return 0;
 177
 178         return sprintf (buf, "%u\n",
 179                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 180 }
 181
 182 static ssize_t
 183 msi_bus_store(struct device *dev, struct device_attribute *attr,
 184               const char *buf, size_t count)
 185 {
 186         struct pci_dev *pdev = to_pci_dev(dev);
 187
 188         /* bad things may happen if the no_msi flag is changed
 189          * while some drivers are loaded */
 190         if (!capable(CAP_SYS_ADMIN))
 191                 return count;
 192
 193         if (!pdev->subordinate)
 194                 return count;
 195
 196         if (*buf == '0') {
 197                 pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 198                 dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
 199                          " bad things could happen.\n");
 200         }
 201
 202         if (*buf == '1') {
 203                 pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
 204                 dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
 205                          " bad things could happen.\n");
 206         }
 207
 208         return count;
 209 }
 210
 211 struct device_attribute pci_dev_attrs[] = {
 212         __ATTR_RO(resource),
 213         __ATTR_RO(vendor),
 214         __ATTR_RO(device),
 215         __ATTR_RO(subsystem_vendor),
 216         __ATTR_RO(subsystem_device),
 217         __ATTR_RO(class),
 218         __ATTR_RO(irq),
 219         __ATTR_RO(local_cpus),
 220         __ATTR_RO(local_cpulist),
 221         __ATTR_RO(modalias),
 222 #ifdef CONFIG_NUMA
 223         __ATTR_RO(numa_node),
 224 #endif
 225         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 226         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 227                 broken_parity_status_show,broken_parity_status_store),
 228         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 229         __ATTR_NULL,
 230 };
 231
 232 static ssize_t
 233 pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 234                 char *buf, loff_t off, size_t count)
 235 {
 236         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 237         unsigned int size = 64;
 238         loff_t init_off = off;
 239         u8 *data = (u8*) buf;
 240
 241         /* Several chips lock up trying to read undefined config space */
 242         if (capable(CAP_SYS_ADMIN)) {
 243                 size = dev->cfg_size;
 244         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 245                 size = 128;
 246         }
 247
 248         if (off > size)
 249                 return 0;
 250         if (off + count > size) {
 251                 size -= off;
 252                 count = size;
 253         } else {
 254                 size = count;
 255         }
 256
 257         if ((off & 1) && size) {
 258                 u8 val;
 259                 pci_user_read_config_byte(dev, off, &val);
 260                 data[off - init_off] = val;
 261                 off++;
 262                 size--;
 263         }
 264
 265         if ((off & 3) && size > 2) {
 266                 u16 val;
 267                 pci_user_read_config_word(dev, off, &val);
 268                 data[off - init_off] = val & 0xff;
 269                 data[off - init_off + 1] = (val >> 8) & 0xff;
 270                 off += 2;
 271                 size -= 2;
 272         }
 273
 274         while (size > 3) {
 275                 u32 val;
 276                 pci_user_read_config_dword(dev, off, &val);
 277                 data[off - init_off] = val & 0xff;
 278                 data[off - init_off + 1] = (val >> 8) & 0xff;
 279                 data[off - init_off + 2] = (val >> 16) & 0xff;
 280                 data[off - init_off + 3] = (val >> 24) & 0xff;
 281                 off += 4;
 282                 size -= 4;
 283         }
 284
 285         if (size >= 2) {
 286                 u16 val;
 287                 pci_user_read_config_word(dev, off, &val);
 288                 data[off - init_off] = val & 0xff;
 289                 data[off - init_off + 1] = (val >> 8) & 0xff;
 290                 off += 2;
 291                 size -= 2;
 292         }
 293
 294         if (size > 0) {
 295                 u8 val;
 296                 pci_user_read_config_byte(dev, off, &val);
 297                 data[off - init_off] = val;
 298                 off++;
 299                 --size;
 300         }
 301
 302         return count;
 303 }
 304
 305 static ssize_t
 306 pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 307                  char *buf, loff_t off, size_t count)
 308 {
 309         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 310         unsigned int size = count;
 311         loff_t init_off = off;
 312         u8 *data = (u8*) buf;
 313
 314         if (off > dev->cfg_size)
 315                 return 0;
 316         if (off + count > dev->cfg_size) {
 317                 size = dev->cfg_size - off;
 318                 count = size;
 319         }
 320
 321         if ((off & 1) && size) {
 322                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 323                 off++;
 324                 size--;
 325         }
 326
 327         if ((off & 3) && size > 2) {
 328                 u16 val = data[off - init_off];
 329                 val |= (u16) data[off - init_off + 1] << 8;
 330                 pci_user_write_config_word(dev, off, val);
 331                 off += 2;
 332                 size -= 2;
 333         }
 334
 335         while (size > 3) {
 336                 u32 val = data[off - init_off];
 337                 val |= (u32) data[off - init_off + 1] << 8;
 338                 val |= (u32) data[off - init_off + 2] << 16;
 339                 val |= (u32) data[off - init_off + 3] << 24;
 340                 pci_user_write_config_dword(dev, off, val);
 341                 off += 4;
 342                 size -= 4;
 343         }
 344
 345         if (size >= 2) {
 346                 u16 val = data[off - init_off];
 347                 val |= (u16) data[off - init_off + 1] << 8;
 348                 pci_user_write_config_word(dev, off, val);
 349                 off += 2;
 350                 size -= 2;
 351         }
 352
 353         if (size) {
 354                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 355                 off++;
 356                 --size;
 357         }
 358
 359         return count;
 360 }
 361
 362 static ssize_t
 363 pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
 364              char *buf, loff_t off, size_t count)
 365 {
 366         struct pci_dev *dev =
 367                 to_pci_dev(container_of(kobj, struct device, kobj));
 368         int end;
 369         int ret;
 370
 371         if (off > bin_attr->size)
 372                 count = 0;
 373         else if (count > bin_attr->size - off)
 374                 count = bin_attr->size - off;
 375         end = off + count;
 376
 377         while (off < end) {
 378                 ret = dev->vpd->ops->read(dev, off, end - off, buf);
 379                 if (ret < 0)
 380                         return ret;
 381                 buf += ret;
 382                 off += ret;
 383         }
 384
 385         return count;
 386 }
 387
 388 static ssize_t
 389 pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
 390               char *buf, loff_t off, size_t count)
 391 {
 392         struct pci_dev *dev =
 393                 to_pci_dev(container_of(kobj, struct device, kobj));
 394         int end;
 395         int ret;
 396
 397         if (off > bin_attr->size)
 398                 count = 0;
 399         else if (count > bin_attr->size - off)
 400                 count = bin_attr->size - off;
 401         end = off + count;
 402
 403         while (off < end) {
 404                 ret = dev->vpd->ops->write(dev, off, end - off, buf);
 405                 if (ret < 0)
 406                         return ret;
 407                 buf += ret;
 408                 off += ret;
 409         }
 410
 411         return count;
 412 }
 413
 414 #ifdef HAVE_PCI_LEGACY
 415 /**
 416  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 417  * @kobj: kobject corresponding to file to read from
 418  * @buf: buffer to store results
 419  * @off: offset into legacy I/O port space
 420  * @count: number of bytes to read
 421  *
 422  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 423  * callback routine (pci_legacy_read).
 424  */
 425 ssize_t
 426 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 427                    char *buf, loff_t off, size_t count)
 428 {
 429         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 430                                                       struct device,
 431                                                       kobj));
 432
 433         /* Only support 1, 2 or 4 byte accesses */
 434         if (count != 1 && count != 2 && count != 4)
 435                 return -EINVAL;
 436
 437         return pci_legacy_read(bus, off, (u32 *)buf, count);
 438 }
 439
 440 /**
 441  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 442  * @kobj: kobject corresponding to file to read from
 443  * @buf: buffer containing value to be written
 444  * @off: offset into legacy I/O port space
 445  * @count: number of bytes to write
 446  *
 447  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 448  * callback routine (pci_legacy_write).
 449  */
 450 ssize_t
 451 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 452                     char *buf, loff_t off, size_t count)
 453 {
 454         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 455                                                       struct device,
 456                                                       kobj));
 457         /* Only support 1, 2 or 4 byte accesses */
 458         if (count != 1 && count != 2 && count != 4)
 459                 return -EINVAL;
 460
 461         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 462 }
 463
 464 /**
 465  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 466  * @kobj: kobject corresponding to device to be mapped
 467  * @attr: struct bin_attribute for this file
 468  * @vma: struct vm_area_struct passed to mmap
 469  *
 470  * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
 471  * legacy memory space (first meg of bus space) into application virtual
 472  * memory space.
 473  */
 474 int
 475 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 476                     struct vm_area_struct *vma)
 477 {
 478         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 479                                                       struct device,
 480                                                       kobj));
 481
 482         return pci_mmap_legacy_page_range(bus, vma);
 483 }
 484 #endif /* HAVE_PCI_LEGACY */
 485
 486 #ifdef HAVE_PCI_MMAP
 487 /**
 488  * pci_mmap_resource - map a PCI resource into user memory space
 489  * @kobj: kobject for mapping
 490  * @attr: struct bin_attribute for the file being mapped
 491  * @vma: struct vm_area_struct passed into the mmap
 492  * @write_combine: 1 for write_combine mapping
 493  *
 494  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 495  */
 496 static int
 497 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 498                   struct vm_area_struct *vma, int write_combine)
 499 {
 500         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 501                                                        struct device, kobj));
 502         struct resource *res = (struct resource *)attr->private;
 503         enum pci_mmap_state mmap_type;
 504         resource_size_t start, end;
 505         int i;
 506
 507         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 508                 if (res == &pdev->resource[i])
 509                         break;
 510         if (i >= PCI_ROM_RESOURCE)
 511                 return -ENODEV;
 512
 513         /* pci_mmap_page_range() expects the same kind of entry as coming
 514          * from /proc/bus/pci/ which is a "user visible" value. If this is
 515          * different from the resource itself, arch will do necessary fixup.
 516          */
 517         pci_resource_to_user(pdev, i, res, &start, &end);
 518         vma->vm_pgoff += start >> PAGE_SHIFT;
 519         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 520
 521         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 522 }
 523
 524 static int
 525 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
 526                      struct vm_area_struct *vma)
 527 {
 528         return pci_mmap_resource(kobj, attr, vma, 0);
 529 }
 530
 531 static int
 532 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
 533                      struct vm_area_struct *vma)
 534 {
 535         return pci_mmap_resource(kobj, attr, vma, 1);
 536 }
 537
 538 /**
 539  * pci_remove_resource_files - cleanup resource files
 540  * @dev: dev to cleanup
 541  *
 542  * If we created resource files for @dev, remove them from sysfs and
 543  * free their resources.
 544  */
 545 static void
 546 pci_remove_resource_files(struct pci_dev *pdev)
 547 {
 548         int i;
 549
 550         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 551                 struct bin_attribute *res_attr;
 552
 553                 res_attr = pdev->res_attr[i];
 554                 if (res_attr) {
 555                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 556                         kfree(res_attr);
 557                 }
 558
 559                 res_attr = pdev->res_attr_wc[i];
 560                 if (res_attr) {
 561                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 562                         kfree(res_attr);
 563                 }
 564         }
 565 }
 566
 567 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 568 {
 569         /* allocate attribute structure, piggyback attribute name */
 570         int name_len = write_combine ? 13 : 10;
 571         struct bin_attribute *res_attr;
 572         int retval;
 573
 574         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 575         if (res_attr) {
 576                 char *res_attr_name = (char *)(res_attr + 1);
 577
 578                 if (write_combine) {
 579                         pdev->res_attr_wc[num] = res_attr;
 580                         sprintf(res_attr_name, "resource%d_wc", num);
 581                         res_attr->mmap = pci_mmap_resource_wc;
 582                 } else {
 583                         pdev->res_attr[num] = res_attr;
 584                         sprintf(res_attr_name, "resource%d", num);
 585                         res_attr->mmap = pci_mmap_resource_uc;
 586                 }
 587                 res_attr->attr.name = res_attr_name;
 588                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 589                 res_attr->size = pci_resource_len(pdev, num);
 590                 res_attr->private = &pdev->resource[num];
 591                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 592         } else
 593                 retval = -ENOMEM;
 594
 595         return retval;
 596 }
 597
 598 /**
 599  * pci_create_resource_files - create resource files in sysfs for @dev
 600  * @dev: dev in question
 601  *
 602  * Walk the resources in @dev creating files for each resource available.
 603  */
 604 static int pci_create_resource_files(struct pci_dev *pdev)
 605 {
 606         int i;
 607         int retval;
 608
 609         /* Expose the PCI resources from this device as files */
 610         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 611
 612                 /* skip empty resources */
 613                 if (!pci_resource_len(pdev, i))
 614                         continue;
 615
 616                 retval = pci_create_attr(pdev, i, 0);
 617                 /* for prefetchable resources, create a WC mappable file */
 618                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 619                         retval = pci_create_attr(pdev, i, 1);
 620
 621                 if (retval) {
 622                         pci_remove_resource_files(pdev);
 623                         return retval;
 624                 }
 625         }
 626         return 0;
 627 }
 628 #else /* !HAVE_PCI_MMAP */
 629 static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
 630 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
 631 #endif /* HAVE_PCI_MMAP */
 632
 633 /**
 634  * pci_write_rom - used to enable access to the PCI ROM display
 635  * @kobj: kernel object handle
 636  * @buf: user input
 637  * @off: file offset
 638  * @count: number of byte in input
 639  *
 640  * writing anything except 0 enables it
 641  */
 642 static ssize_t
 643 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 644               char *buf, loff_t off, size_t count)
 645 {
 646         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 647
 648         if ((off ==  0) && (*buf == '0') && (count == 2))
 649                 pdev->rom_attr_enabled = 0;
 650         else
 651                 pdev->rom_attr_enabled = 1;
 652
 653         return count;
 654 }
 655
 656 /**
 657  * pci_read_rom - read a PCI ROM
 658  * @kobj: kernel object handle
 659  * @buf: where to put the data we read from the ROM
 660  * @off: file offset
 661  * @count: number of bytes to read
 662  *
 663  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 664  * device corresponding to @kobj.
 665  */
 666 static ssize_t
 667 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 668              char *buf, loff_t off, size_t count)
 669 {
 670         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 671         void __iomem *rom;
 672         size_t size;
 673
 674         if (!pdev->rom_attr_enabled)
 675                 return -EINVAL;
 676
 677         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 678         if (!rom)
 679                 return 0;
 680
 681         if (off >= size)
 682                 count = 0;
 683         else {
 684                 if (off + count > size)
 685                         count = size - off;
 686
 687                 memcpy_fromio(buf, rom + off, count);
 688         }
 689         pci_unmap_rom(pdev, rom);
 690
 691         return count;
 692 }
 693
 694 static struct bin_attribute pci_config_attr = {
 695         .attr = {
 696                 .name = "config",
 697                 .mode = S_IRUGO | S_IWUSR,
 698         },
 699         .size = 256,
 700         .read = pci_read_config,
 701         .write = pci_write_config,
 702 };
 703
 704 static struct bin_attribute pcie_config_attr = {
 705         .attr = {
 706                 .name = "config",
 707                 .mode = S_IRUGO | S_IWUSR,
 708         },
 709         .size = 4096,
 710         .read = pci_read_config,
 711         .write = pci_write_config,
 712 };
 713
 714 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 715 {
 716         return 0;
 717 }
 718
 719 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 720 {
 721         struct bin_attribute *attr = NULL;
 722         int retval;
 723
 724         if (!sysfs_initialized)
 725                 return -EACCES;
 726
 727         if (pdev->cfg_size < 4096)
 728                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 729         else
 730                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 731         if (retval)
 732                 goto err;
 733
 734         /* If the device has VPD, try to expose it in sysfs. */
 735         if (pdev->vpd) {
 736                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 737                 if (attr) {
 738                         pdev->vpd->attr = attr;
 739                         attr->size = pdev->vpd->ops->get_size(pdev);
 740                         attr->attr.name = "vpd";
 741                         attr->attr.mode = S_IRUGO | S_IWUSR;
 742                         attr->read = pci_read_vpd;
 743                         attr->write = pci_write_vpd;
 744                         retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
 745                         if (retval)
 746                                 goto err_vpd;
 747                 } else {
 748                         retval = -ENOMEM;
 749                         goto err_config_file;
 750                 }
 751         }
 752
 753         retval = pci_create_resource_files(pdev);
 754         if (retval)
 755                 goto err_vpd_file;
 756
 757         /* If the device has a ROM, try to expose it in sysfs. */
 758         if (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
 759             (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
 760                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 761                 if (attr) {
 762                         pdev->rom_attr = attr;
 763                         attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 764                         attr->attr.name = "rom";
 765                         attr->attr.mode = S_IRUSR;
 766                         attr->read = pci_read_rom;
 767                         attr->write = pci_write_rom;
 768                         retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
 769                         if (retval)
 770                                 goto err_rom;
 771                 } else {
 772                         retval = -ENOMEM;
 773                         goto err_resource_files;
 774                 }
 775         }
 776         /* add platform-specific attributes */
 777         if (pcibios_add_platform_entries(pdev))
 778                 goto err_rom_file;
 779
 780         pcie_aspm_create_sysfs_dev_files(pdev);
 781
 782         return 0;
 783
 784 err_rom_file:
 785         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
 786                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 787 err_rom:
 788         kfree(pdev->rom_attr);
 789 err_resource_files:
 790         pci_remove_resource_files(pdev);
 791 err_vpd_file:
 792         if (pdev->vpd) {
 793                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
 794 err_vpd:
 795                 kfree(pdev->vpd->attr);
 796         }
 797 err_config_file:
 798         if (pdev->cfg_size < 4096)
 799                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 800         else
 801                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 802 err:
 803         return retval;
 804 }
 805
 806 /**
 807  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
 808  * @pdev: device whose entries we should free
 809  *
 810  * Cleanup when @pdev is removed from sysfs.
 811  */
 812 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 813 {
 814         if (!sysfs_initialized)
 815                 return;
 816
 817         pcie_aspm_remove_sysfs_dev_files(pdev);
 818
 819         if (pdev->vpd) {
 820                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
 821                 kfree(pdev->vpd->attr);
 822         }
 823         if (pdev->cfg_size < 4096)
 824                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 825         else
 826                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 827
 828         pci_remove_resource_files(pdev);
 829
 830         if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 831                 if (pdev->rom_attr) {
 832                         sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 833                         kfree(pdev->rom_attr);
 834                 }
 835         }
 836 }
 837
 838 static int __init pci_sysfs_init(void)
 839 {
 840         struct pci_dev *pdev = NULL;
 841         int retval;
 842
 843         sysfs_initialized = 1;
 844         for_each_pci_dev(pdev) {
 845                 retval = pci_create_sysfs_dev_files(pdev);
 846                 if (retval) {
 847                         pci_dev_put(pdev);
 848                         return retval;
 849                 }
 850         }
 851
 852         return 0;
 853 }
 854
 855 late_initcall(pci_sysfs_init);