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/capability.h>
  25 #include <linux/pci-aspm.h>
  26 #include "pci.h"
  27
  28 static int sysfs_initialized;   /* = 0 */
  29
  30 /* show configuration fields */
  31 #define pci_config_attr(field, format_string)                           \
  32 static ssize_t                                                          \
  33 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  34 {                                                                       \
  35         struct pci_dev *pdev;                                           \
  36                                                                         \
  37         pdev = to_pci_dev (dev);                                        \
  38         return sprintf (buf, format_string, pdev->field);               \
  39 }
  40
  41 pci_config_attr(vendor, "0x%04x\n");
  42 pci_config_attr(device, "0x%04x\n");
  43 pci_config_attr(subsystem_vendor, "0x%04x\n");
  44 pci_config_attr(subsystem_device, "0x%04x\n");
  45 pci_config_attr(class, "0x%06x\n");
  46 pci_config_attr(irq, "%u\n");
  47
  48 static ssize_t broken_parity_status_show(struct device *dev,
  49                                          struct device_attribute *attr,
  50                                          char *buf)
  51 {
  52         struct pci_dev *pdev = to_pci_dev(dev);
  53         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  54 }
  55
  56 static ssize_t broken_parity_status_store(struct device *dev,
  57                                           struct device_attribute *attr,
  58                                           const char *buf, size_t count)
  59 {
  60         struct pci_dev *pdev = to_pci_dev(dev);
  61         unsigned long val;
  62
  63         if (strict_strtoul(buf, 0, &val) < 0)
  64                 return -EINVAL;
  65
  66         pdev->broken_parity_status = !!val;
  67
  68         return count;
  69 }
  70
  71 static ssize_t local_cpus_show(struct device *dev,
  72                         struct device_attribute *attr, char *buf)
  73 {
  74         const struct cpumask *mask;
  75         int len;
  76
  77         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  78         len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  79         buf[len++] = '\n';
  80         buf[len] = '\0';
  81         return len;
  82 }
  83
  84
  85 static ssize_t local_cpulist_show(struct device *dev,
  86                         struct device_attribute *attr, char *buf)
  87 {
  88         const struct cpumask *mask;
  89         int len;
  90
  91         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  92         len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
  93         buf[len++] = '\n';
  94         buf[len] = '\0';
  95         return len;
  96 }
  97
  98 /* show resources */
  99 static ssize_t
 100 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 101 {
 102         struct pci_dev * pci_dev = to_pci_dev(dev);
 103         char * str = buf;
 104         int i;
 105         int max;
 106         resource_size_t start, end;
 107
 108         if (pci_dev->subordinate)
 109                 max = DEVICE_COUNT_RESOURCE;
 110         else
 111                 max = PCI_BRIDGE_RESOURCES;
 112
 113         for (i = 0; i < max; i++) {
 114                 struct resource *res =  &pci_dev->resource[i];
 115                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 116                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 117                                (unsigned long long)start,
 118                                (unsigned long long)end,
 119                                (unsigned long long)res->flags);
 120         }
 121         return (str - buf);
 122 }
 123
 124 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 125 {
 126         struct pci_dev *pci_dev = to_pci_dev(dev);
 127
 128         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 129                        pci_dev->vendor, pci_dev->device,
 130                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 131                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 132                        (u8)(pci_dev->class));
 133 }
 134
 135 static ssize_t is_enabled_store(struct device *dev,
 136                                 struct device_attribute *attr, const char *buf,
 137                                 size_t count)
 138 {
 139         struct pci_dev *pdev = to_pci_dev(dev);
 140         unsigned long val;
 141         ssize_t result = strict_strtoul(buf, 0, &val);
 142
 143         if (result < 0)
 144                 return result;
 145
 146         /* this can crash the machine when done on the "wrong" device */
 147         if (!capable(CAP_SYS_ADMIN))
 148                 return -EPERM;
 149
 150         if (!val) {
 151                 if (atomic_read(&pdev->enable_cnt) != 0)
 152                         pci_disable_device(pdev);
 153                 else
 154                         result = -EIO;
 155         } else
 156                 result = pci_enable_device(pdev);
 157
 158         return result < 0 ? result : count;
 159 }
 160
 161 static ssize_t is_enabled_show(struct device *dev,
 162                                struct device_attribute *attr, char *buf)
 163 {
 164         struct pci_dev *pdev;
 165
 166         pdev = to_pci_dev (dev);
 167         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 168 }
 169
 170 #ifdef CONFIG_NUMA
 171 static ssize_t
 172 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 173 {
 174         return sprintf (buf, "%d\n", dev->numa_node);
 175 }
 176 #endif
 177
 178 static ssize_t
 179 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 180 {
 181         struct pci_dev *pdev = to_pci_dev(dev);
 182
 183         if (!pdev->subordinate)
 184                 return 0;
 185
 186         return sprintf (buf, "%u\n",
 187                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 188 }
 189
 190 static ssize_t
 191 msi_bus_store(struct device *dev, struct device_attribute *attr,
 192               const char *buf, size_t count)
 193 {
 194         struct pci_dev *pdev = to_pci_dev(dev);
 195         unsigned long val;
 196
 197         if (strict_strtoul(buf, 0, &val) < 0)
 198                 return -EINVAL;
 199
 200         /* bad things may happen if the no_msi flag is changed
 201          * while some drivers are loaded */
 202         if (!capable(CAP_SYS_ADMIN))
 203                 return -EPERM;
 204
 205         /* Maybe pci devices without subordinate busses shouldn't even have this
 206          * attribute in the first place?  */
 207         if (!pdev->subordinate)
 208                 return count;
 209
 210         /* Is the flag going to change, or keep the value it already had? */
 211         if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 212             !!val) {
 213                 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 214
 215                 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 216                          " bad things could happen\n", val ? "" : " not");
 217         }
 218
 219         return count;
 220 }
 221
 222 struct device_attribute pci_dev_attrs[] = {
 223         __ATTR_RO(resource),
 224         __ATTR_RO(vendor),
 225         __ATTR_RO(device),
 226         __ATTR_RO(subsystem_vendor),
 227         __ATTR_RO(subsystem_device),
 228         __ATTR_RO(class),
 229         __ATTR_RO(irq),
 230         __ATTR_RO(local_cpus),
 231         __ATTR_RO(local_cpulist),
 232         __ATTR_RO(modalias),
 233 #ifdef CONFIG_NUMA
 234         __ATTR_RO(numa_node),
 235 #endif
 236         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 237         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 238                 broken_parity_status_show,broken_parity_status_store),
 239         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 240         __ATTR_NULL,
 241 };
 242
 243 static ssize_t
 244 pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 245                 char *buf, loff_t off, size_t count)
 246 {
 247         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 248         unsigned int size = 64;
 249         loff_t init_off = off;
 250         u8 *data = (u8*) buf;
 251
 252         /* Several chips lock up trying to read undefined config space */
 253         if (capable(CAP_SYS_ADMIN)) {
 254                 size = dev->cfg_size;
 255         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 256                 size = 128;
 257         }
 258
 259         if (off > size)
 260                 return 0;
 261         if (off + count > size) {
 262                 size -= off;
 263                 count = size;
 264         } else {
 265                 size = count;
 266         }
 267
 268         if ((off & 1) && size) {
 269                 u8 val;
 270                 pci_user_read_config_byte(dev, off, &val);
 271                 data[off - init_off] = val;
 272                 off++;
 273                 size--;
 274         }
 275
 276         if ((off & 3) && size > 2) {
 277                 u16 val;
 278                 pci_user_read_config_word(dev, off, &val);
 279                 data[off - init_off] = val & 0xff;
 280                 data[off - init_off + 1] = (val >> 8) & 0xff;
 281                 off += 2;
 282                 size -= 2;
 283         }
 284
 285         while (size > 3) {
 286                 u32 val;
 287                 pci_user_read_config_dword(dev, off, &val);
 288                 data[off - init_off] = val & 0xff;
 289                 data[off - init_off + 1] = (val >> 8) & 0xff;
 290                 data[off - init_off + 2] = (val >> 16) & 0xff;
 291                 data[off - init_off + 3] = (val >> 24) & 0xff;
 292                 off += 4;
 293                 size -= 4;
 294         }
 295
 296         if (size >= 2) {
 297                 u16 val;
 298                 pci_user_read_config_word(dev, off, &val);
 299                 data[off - init_off] = val & 0xff;
 300                 data[off - init_off + 1] = (val >> 8) & 0xff;
 301                 off += 2;
 302                 size -= 2;
 303         }
 304
 305         if (size > 0) {
 306                 u8 val;
 307                 pci_user_read_config_byte(dev, off, &val);
 308                 data[off - init_off] = val;
 309                 off++;
 310                 --size;
 311         }
 312
 313         return count;
 314 }
 315
 316 static ssize_t
 317 pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 318                  char *buf, loff_t off, size_t count)
 319 {
 320         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 321         unsigned int size = count;
 322         loff_t init_off = off;
 323         u8 *data = (u8*) buf;
 324
 325         if (off > dev->cfg_size)
 326                 return 0;
 327         if (off + count > dev->cfg_size) {
 328                 size = dev->cfg_size - off;
 329                 count = size;
 330         }
 331
 332         if ((off & 1) && size) {
 333                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 334                 off++;
 335                 size--;
 336         }
 337
 338         if ((off & 3) && size > 2) {
 339                 u16 val = data[off - init_off];
 340                 val |= (u16) data[off - init_off + 1] << 8;
 341                 pci_user_write_config_word(dev, off, val);
 342                 off += 2;
 343                 size -= 2;
 344         }
 345
 346         while (size > 3) {
 347                 u32 val = data[off - init_off];
 348                 val |= (u32) data[off - init_off + 1] << 8;
 349                 val |= (u32) data[off - init_off + 2] << 16;
 350                 val |= (u32) data[off - init_off + 3] << 24;
 351                 pci_user_write_config_dword(dev, off, val);
 352                 off += 4;
 353                 size -= 4;
 354         }
 355
 356         if (size >= 2) {
 357                 u16 val = data[off - init_off];
 358                 val |= (u16) data[off - init_off + 1] << 8;
 359                 pci_user_write_config_word(dev, off, val);
 360                 off += 2;
 361                 size -= 2;
 362         }
 363
 364         if (size) {
 365                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 366                 off++;
 367                 --size;
 368         }
 369
 370         return count;
 371 }
 372
 373 static ssize_t
 374 read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
 375               char *buf, loff_t off, size_t count)
 376 {
 377         struct pci_dev *dev =
 378                 to_pci_dev(container_of(kobj, struct device, kobj));
 379
 380         if (off > bin_attr->size)
 381                 count = 0;
 382         else if (count > bin_attr->size - off)
 383                 count = bin_attr->size - off;
 384
 385         return pci_read_vpd(dev, off, count, buf);
 386 }
 387
 388 static ssize_t
 389 write_vpd_attr(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
 395         if (off > bin_attr->size)
 396                 count = 0;
 397         else if (count > bin_attr->size - off)
 398                 count = bin_attr->size - off;
 399
 400         return pci_write_vpd(dev, off, count, buf);
 401 }
 402
 403 #ifdef HAVE_PCI_LEGACY
 404 /**
 405  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 406  * @kobj: kobject corresponding to file to read from
 407  * @buf: buffer to store results
 408  * @off: offset into legacy I/O port space
 409  * @count: number of bytes to read
 410  *
 411  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 412  * callback routine (pci_legacy_read).
 413  */
 414 static ssize_t
 415 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 416                    char *buf, loff_t off, size_t count)
 417 {
 418         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 419                                                       struct device,
 420                                                       kobj));
 421
 422         /* Only support 1, 2 or 4 byte accesses */
 423         if (count != 1 && count != 2 && count != 4)
 424                 return -EINVAL;
 425
 426         return pci_legacy_read(bus, off, (u32 *)buf, count);
 427 }
 428
 429 /**
 430  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 431  * @kobj: kobject corresponding to file to read from
 432  * @buf: buffer containing value to be written
 433  * @off: offset into legacy I/O port space
 434  * @count: number of bytes to write
 435  *
 436  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 437  * callback routine (pci_legacy_write).
 438  */
 439 static ssize_t
 440 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 441                     char *buf, loff_t off, size_t count)
 442 {
 443         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 444                                                       struct device,
 445                                                       kobj));
 446         /* Only support 1, 2 or 4 byte accesses */
 447         if (count != 1 && count != 2 && count != 4)
 448                 return -EINVAL;
 449
 450         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 451 }
 452
 453 /**
 454  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 455  * @kobj: kobject corresponding to device to be mapped
 456  * @attr: struct bin_attribute for this file
 457  * @vma: struct vm_area_struct passed to mmap
 458  *
 459  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 460  * legacy memory space (first meg of bus space) into application virtual
 461  * memory space.
 462  */
 463 static int
 464 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 465                     struct vm_area_struct *vma)
 466 {
 467         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 468                                                       struct device,
 469                                                       kobj));
 470
 471         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 472 }
 473
 474 /**
 475  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 476  * @kobj: kobject corresponding to device to be mapped
 477  * @attr: struct bin_attribute for this file
 478  * @vma: struct vm_area_struct passed to mmap
 479  *
 480  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 481  * legacy IO space (first meg of bus space) into application virtual
 482  * memory space. Returns -ENOSYS if the operation isn't supported
 483  */
 484 static int
 485 pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
 486                    struct vm_area_struct *vma)
 487 {
 488         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 489                                                       struct device,
 490                                                       kobj));
 491
 492         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 493 }
 494
 495 /**
 496  * pci_create_legacy_files - create legacy I/O port and memory files
 497  * @b: bus to create files under
 498  *
 499  * Some platforms allow access to legacy I/O port and ISA memory space on
 500  * a per-bus basis.  This routine creates the files and ties them into
 501  * their associated read, write and mmap files from pci-sysfs.c
 502  *
 503  * On error unwind, but don't propogate the error to the caller
 504  * as it is ok to set up the PCI bus without these files.
 505  */
 506 void pci_create_legacy_files(struct pci_bus *b)
 507 {
 508         int error;
 509
 510         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 511                                GFP_ATOMIC);
 512         if (!b->legacy_io)
 513                 goto kzalloc_err;
 514
 515         b->legacy_io->attr.name = "legacy_io";
 516         b->legacy_io->size = 0xffff;
 517         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 518         b->legacy_io->read = pci_read_legacy_io;
 519         b->legacy_io->write = pci_write_legacy_io;
 520         b->legacy_io->mmap = pci_mmap_legacy_io;
 521         error = device_create_bin_file(&b->dev, b->legacy_io);
 522         if (error)
 523                 goto legacy_io_err;
 524
 525         /* Allocated above after the legacy_io struct */
 526         b->legacy_mem = b->legacy_io + 1;
 527         b->legacy_mem->attr.name = "legacy_mem";
 528         b->legacy_mem->size = 1024*1024;
 529         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 530         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 531         error = device_create_bin_file(&b->dev, b->legacy_mem);
 532         if (error)
 533                 goto legacy_mem_err;
 534
 535         return;
 536
 537 legacy_mem_err:
 538         device_remove_bin_file(&b->dev, b->legacy_io);
 539 legacy_io_err:
 540         kfree(b->legacy_io);
 541         b->legacy_io = NULL;
 542 kzalloc_err:
 543         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 544                "and ISA memory resources to sysfs\n");
 545         return;
 546 }
 547
 548 void pci_remove_legacy_files(struct pci_bus *b)
 549 {
 550         if (b->legacy_io) {
 551                 device_remove_bin_file(&b->dev, b->legacy_io);
 552                 device_remove_bin_file(&b->dev, b->legacy_mem);
 553                 kfree(b->legacy_io); /* both are allocated here */
 554         }
 555 }
 556 #endif /* HAVE_PCI_LEGACY */
 557
 558 #ifdef HAVE_PCI_MMAP
 559
 560 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
 561 {
 562         unsigned long nr, start, size;
 563
 564         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 565         start = vma->vm_pgoff;
 566         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 567         if (start < size && size - start >= nr)
 568                 return 1;
 569         WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
 570                 current->comm, start, start+nr, pci_name(pdev), resno, size);
 571         return 0;
 572 }
 573
 574 /**
 575  * pci_mmap_resource - map a PCI resource into user memory space
 576  * @kobj: kobject for mapping
 577  * @attr: struct bin_attribute for the file being mapped
 578  * @vma: struct vm_area_struct passed into the mmap
 579  * @write_combine: 1 for write_combine mapping
 580  *
 581  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 582  */
 583 static int
 584 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 585                   struct vm_area_struct *vma, int write_combine)
 586 {
 587         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 588                                                        struct device, kobj));
 589         struct resource *res = (struct resource *)attr->private;
 590         enum pci_mmap_state mmap_type;
 591         resource_size_t start, end;
 592         int i;
 593
 594         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 595                 if (res == &pdev->resource[i])
 596                         break;
 597         if (i >= PCI_ROM_RESOURCE)
 598                 return -ENODEV;
 599
 600         if (!pci_mmap_fits(pdev, i, vma))
 601                 return -EINVAL;
 602
 603         /* pci_mmap_page_range() expects the same kind of entry as coming
 604          * from /proc/bus/pci/ which is a "user visible" value. If this is
 605          * different from the resource itself, arch will do necessary fixup.
 606          */
 607         pci_resource_to_user(pdev, i, res, &start, &end);
 608         vma->vm_pgoff += start >> PAGE_SHIFT;
 609         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 610
 611         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 612                 return -EINVAL;
 613
 614         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 615 }
 616
 617 static int
 618 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
 619                      struct vm_area_struct *vma)
 620 {
 621         return pci_mmap_resource(kobj, attr, vma, 0);
 622 }
 623
 624 static int
 625 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
 626                      struct vm_area_struct *vma)
 627 {
 628         return pci_mmap_resource(kobj, attr, vma, 1);
 629 }
 630
 631 /**
 632  * pci_remove_resource_files - cleanup resource files
 633  * @dev: dev to cleanup
 634  *
 635  * If we created resource files for @dev, remove them from sysfs and
 636  * free their resources.
 637  */
 638 static void
 639 pci_remove_resource_files(struct pci_dev *pdev)
 640 {
 641         int i;
 642
 643         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 644                 struct bin_attribute *res_attr;
 645
 646                 res_attr = pdev->res_attr[i];
 647                 if (res_attr) {
 648                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 649                         kfree(res_attr);
 650                 }
 651
 652                 res_attr = pdev->res_attr_wc[i];
 653                 if (res_attr) {
 654                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 655                         kfree(res_attr);
 656                 }
 657         }
 658 }
 659
 660 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 661 {
 662         /* allocate attribute structure, piggyback attribute name */
 663         int name_len = write_combine ? 13 : 10;
 664         struct bin_attribute *res_attr;
 665         int retval;
 666
 667         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 668         if (res_attr) {
 669                 char *res_attr_name = (char *)(res_attr + 1);
 670
 671                 if (write_combine) {
 672                         pdev->res_attr_wc[num] = res_attr;
 673                         sprintf(res_attr_name, "resource%d_wc", num);
 674                         res_attr->mmap = pci_mmap_resource_wc;
 675                 } else {
 676                         pdev->res_attr[num] = res_attr;
 677                         sprintf(res_attr_name, "resource%d", num);
 678                         res_attr->mmap = pci_mmap_resource_uc;
 679                 }
 680                 res_attr->attr.name = res_attr_name;
 681                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 682                 res_attr->size = pci_resource_len(pdev, num);
 683                 res_attr->private = &pdev->resource[num];
 684                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 685         } else
 686                 retval = -ENOMEM;
 687
 688         return retval;
 689 }
 690
 691 /**
 692  * pci_create_resource_files - create resource files in sysfs for @dev
 693  * @dev: dev in question
 694  *
 695  * Walk the resources in @dev creating files for each resource available.
 696  */
 697 static int pci_create_resource_files(struct pci_dev *pdev)
 698 {
 699         int i;
 700         int retval;
 701
 702         /* Expose the PCI resources from this device as files */
 703         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 704
 705                 /* skip empty resources */
 706                 if (!pci_resource_len(pdev, i))
 707                         continue;
 708
 709                 retval = pci_create_attr(pdev, i, 0);
 710                 /* for prefetchable resources, create a WC mappable file */
 711                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 712                         retval = pci_create_attr(pdev, i, 1);
 713
 714                 if (retval) {
 715                         pci_remove_resource_files(pdev);
 716                         return retval;
 717                 }
 718         }
 719         return 0;
 720 }
 721 #else /* !HAVE_PCI_MMAP */
 722 static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
 723 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
 724 #endif /* HAVE_PCI_MMAP */
 725
 726 /**
 727  * pci_write_rom - used to enable access to the PCI ROM display
 728  * @kobj: kernel object handle
 729  * @buf: user input
 730  * @off: file offset
 731  * @count: number of byte in input
 732  *
 733  * writing anything except 0 enables it
 734  */
 735 static ssize_t
 736 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 737               char *buf, loff_t off, size_t count)
 738 {
 739         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 740
 741         if ((off ==  0) && (*buf == '0') && (count == 2))
 742                 pdev->rom_attr_enabled = 0;
 743         else
 744                 pdev->rom_attr_enabled = 1;
 745
 746         return count;
 747 }
 748
 749 /**
 750  * pci_read_rom - read a PCI ROM
 751  * @kobj: kernel object handle
 752  * @buf: where to put the data we read from the ROM
 753  * @off: file offset
 754  * @count: number of bytes to read
 755  *
 756  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 757  * device corresponding to @kobj.
 758  */
 759 static ssize_t
 760 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 761              char *buf, loff_t off, size_t count)
 762 {
 763         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 764         void __iomem *rom;
 765         size_t size;
 766
 767         if (!pdev->rom_attr_enabled)
 768                 return -EINVAL;
 769
 770         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 771         if (!rom || !size)
 772                 return -EIO;
 773
 774         if (off >= size)
 775                 count = 0;
 776         else {
 777                 if (off + count > size)
 778                         count = size - off;
 779
 780                 memcpy_fromio(buf, rom + off, count);
 781         }
 782         pci_unmap_rom(pdev, rom);
 783
 784         return count;
 785 }
 786
 787 static struct bin_attribute pci_config_attr = {
 788         .attr = {
 789                 .name = "config",
 790                 .mode = S_IRUGO | S_IWUSR,
 791         },
 792         .size = PCI_CFG_SPACE_SIZE,
 793         .read = pci_read_config,
 794         .write = pci_write_config,
 795 };
 796
 797 static struct bin_attribute pcie_config_attr = {
 798         .attr = {
 799                 .name = "config",
 800                 .mode = S_IRUGO | S_IWUSR,
 801         },
 802         .size = PCI_CFG_SPACE_EXP_SIZE,
 803         .read = pci_read_config,
 804         .write = pci_write_config,
 805 };
 806
 807 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 808 {
 809         return 0;
 810 }
 811
 812 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
 813 {
 814         int retval;
 815         struct bin_attribute *attr;
 816
 817         /* If the device has VPD, try to expose it in sysfs. */
 818         if (dev->vpd) {
 819                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 820                 if (!attr)
 821                         return -ENOMEM;
 822
 823                 attr->size = dev->vpd->len;
 824                 attr->attr.name = "vpd";
 825                 attr->attr.mode = S_IRUSR | S_IWUSR;
 826                 attr->read = read_vpd_attr;
 827                 attr->write = write_vpd_attr;
 828                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
 829                 if (retval) {
 830                         kfree(dev->vpd->attr);
 831                         return retval;
 832                 }
 833                 dev->vpd->attr = attr;
 834         }
 835
 836         /* Active State Power Management */
 837         pcie_aspm_create_sysfs_dev_files(dev);
 838
 839         return 0;
 840 }
 841
 842 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 843 {
 844         int retval;
 845         int rom_size = 0;
 846         struct bin_attribute *attr;
 847
 848         if (!sysfs_initialized)
 849                 return -EACCES;
 850
 851         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 852                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 853         else
 854                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 855         if (retval)
 856                 goto err;
 857
 858         retval = pci_create_resource_files(pdev);
 859         if (retval)
 860                 goto err_config_file;
 861
 862         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
 863                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 864         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
 865                 rom_size = 0x20000;
 866
 867         /* If the device has a ROM, try to expose it in sysfs. */
 868         if (rom_size) {
 869                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 870                 if (!attr) {
 871                         retval = -ENOMEM;
 872                         goto err_resource_files;
 873                 }
 874                 attr->size = rom_size;
 875                 attr->attr.name = "rom";
 876                 attr->attr.mode = S_IRUSR;
 877                 attr->read = pci_read_rom;
 878                 attr->write = pci_write_rom;
 879                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
 880                 if (retval) {
 881                         kfree(attr);
 882                         goto err_resource_files;
 883                 }
 884                 pdev->rom_attr = attr;
 885         }
 886
 887         /* add platform-specific attributes */
 888         retval = pcibios_add_platform_entries(pdev);
 889         if (retval)
 890                 goto err_rom_file;
 891
 892         /* add sysfs entries for various capabilities */
 893         retval = pci_create_capabilities_sysfs(pdev);
 894         if (retval)
 895                 goto err_rom_file;
 896
 897         return 0;
 898
 899 err_rom_file:
 900         if (rom_size) {
 901                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 902                 kfree(pdev->rom_attr);
 903                 pdev->rom_attr = NULL;
 904         }
 905 err_resource_files:
 906         pci_remove_resource_files(pdev);
 907 err_config_file:
 908         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 909                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 910         else
 911                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 912 err:
 913         return retval;
 914 }
 915
 916 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
 917 {
 918         if (dev->vpd && dev->vpd->attr) {
 919                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
 920                 kfree(dev->vpd->attr);
 921         }
 922
 923         pcie_aspm_remove_sysfs_dev_files(dev);
 924 }
 925
 926 /**
 927  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
 928  * @pdev: device whose entries we should free
 929  *
 930  * Cleanup when @pdev is removed from sysfs.
 931  */
 932 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 933 {
 934         int rom_size = 0;
 935
 936         if (!sysfs_initialized)
 937                 return;
 938
 939         pci_remove_capabilities_sysfs(pdev);
 940
 941         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 942                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 943         else
 944                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 945
 946         pci_remove_resource_files(pdev);
 947
 948         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
 949                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 950         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
 951                 rom_size = 0x20000;
 952
 953         if (rom_size && pdev->rom_attr) {
 954                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 955                 kfree(pdev->rom_attr);
 956         }
 957 }
 958
 959 static int __init pci_sysfs_init(void)
 960 {
 961         struct pci_dev *pdev = NULL;
 962         int retval;
 963
 964         sysfs_initialized = 1;
 965         for_each_pci_dev(pdev) {
 966                 retval = pci_create_sysfs_dev_files(pdev);
 967                 if (retval) {
 968                         pci_dev_put(pdev);
 969                         return retval;
 970                 }
 971         }
 972
 973         return 0;
 974 }
 975
 976 late_initcall(pci_sysfs_init);