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