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 (pci_is_enabled(pdev))
 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 #ifdef CONFIG_HOTPLUG
 223 static DEFINE_MUTEX(pci_remove_rescan_mutex);
 224 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 225                                 size_t count)
 226 {
 227         unsigned long val;
 228         struct pci_bus *b = NULL;
 229
 230         if (strict_strtoul(buf, 0, &val) < 0)
 231                 return -EINVAL;
 232
 233         if (val) {
 234                 mutex_lock(&pci_remove_rescan_mutex);
 235                 while ((b = pci_find_next_bus(b)) != NULL)
 236                         pci_rescan_bus(b);
 237                 mutex_unlock(&pci_remove_rescan_mutex);
 238         }
 239         return count;
 240 }
 241
 242 struct bus_attribute pci_bus_attrs[] = {
 243         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
 244         __ATTR_NULL
 245 };
 246
 247 static ssize_t
 248 dev_rescan_store(struct device *dev, struct device_attribute *attr,
 249                  const char *buf, size_t count)
 250 {
 251         unsigned long val;
 252         struct pci_dev *pdev = to_pci_dev(dev);
 253
 254         if (strict_strtoul(buf, 0, &val) < 0)
 255                 return -EINVAL;
 256
 257         if (val) {
 258                 mutex_lock(&pci_remove_rescan_mutex);
 259                 pci_rescan_bus(pdev->bus);
 260                 mutex_unlock(&pci_remove_rescan_mutex);
 261         }
 262         return count;
 263 }
 264
 265 static void remove_callback(struct device *dev)
 266 {
 267         struct pci_dev *pdev = to_pci_dev(dev);
 268
 269         mutex_lock(&pci_remove_rescan_mutex);
 270         pci_remove_bus_device(pdev);
 271         mutex_unlock(&pci_remove_rescan_mutex);
 272 }
 273
 274 static ssize_t
 275 remove_store(struct device *dev, struct device_attribute *dummy,
 276              const char *buf, size_t count)
 277 {
 278         int ret = 0;
 279         unsigned long val;
 280
 281         if (strict_strtoul(buf, 0, &val) < 0)
 282                 return -EINVAL;
 283
 284         /* An attribute cannot be unregistered by one of its own methods,
 285          * so we have to use this roundabout approach.
 286          */
 287         if (val)
 288                 ret = device_schedule_callback(dev, remove_callback);
 289         if (ret)
 290                 count = ret;
 291         return count;
 292 }
 293 #endif
 294
 295 struct device_attribute pci_dev_attrs[] = {
 296         __ATTR_RO(resource),
 297         __ATTR_RO(vendor),
 298         __ATTR_RO(device),
 299         __ATTR_RO(subsystem_vendor),
 300         __ATTR_RO(subsystem_device),
 301         __ATTR_RO(class),
 302         __ATTR_RO(irq),
 303         __ATTR_RO(local_cpus),
 304         __ATTR_RO(local_cpulist),
 305         __ATTR_RO(modalias),
 306 #ifdef CONFIG_NUMA
 307         __ATTR_RO(numa_node),
 308 #endif
 309         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 310         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 311                 broken_parity_status_show,broken_parity_status_store),
 312         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 313 #ifdef CONFIG_HOTPLUG
 314         __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
 315         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
 316 #endif
 317         __ATTR_NULL,
 318 };
 319
 320 static ssize_t
 321 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 322 {
 323         struct pci_dev *pdev = to_pci_dev(dev);
 324
 325         return sprintf(buf, "%u\n",
 326                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 327                    IORESOURCE_ROM_SHADOW));
 328 }
 329 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 330
 331 static ssize_t
 332 pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 333                 char *buf, loff_t off, size_t count)
 334 {
 335         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 336         unsigned int size = 64;
 337         loff_t init_off = off;
 338         u8 *data = (u8*) buf;
 339
 340         /* Several chips lock up trying to read undefined config space */
 341         if (capable(CAP_SYS_ADMIN)) {
 342                 size = dev->cfg_size;
 343         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 344                 size = 128;
 345         }
 346
 347         if (off > size)
 348                 return 0;
 349         if (off + count > size) {
 350                 size -= off;
 351                 count = size;
 352         } else {
 353                 size = count;
 354         }
 355
 356         if ((off & 1) && size) {
 357                 u8 val;
 358                 pci_user_read_config_byte(dev, off, &val);
 359                 data[off - init_off] = val;
 360                 off++;
 361                 size--;
 362         }
 363
 364         if ((off & 3) && size > 2) {
 365                 u16 val;
 366                 pci_user_read_config_word(dev, off, &val);
 367                 data[off - init_off] = val & 0xff;
 368                 data[off - init_off + 1] = (val >> 8) & 0xff;
 369                 off += 2;
 370                 size -= 2;
 371         }
 372
 373         while (size > 3) {
 374                 u32 val;
 375                 pci_user_read_config_dword(dev, off, &val);
 376                 data[off - init_off] = val & 0xff;
 377                 data[off - init_off + 1] = (val >> 8) & 0xff;
 378                 data[off - init_off + 2] = (val >> 16) & 0xff;
 379                 data[off - init_off + 3] = (val >> 24) & 0xff;
 380                 off += 4;
 381                 size -= 4;
 382         }
 383
 384         if (size >= 2) {
 385                 u16 val;
 386                 pci_user_read_config_word(dev, off, &val);
 387                 data[off - init_off] = val & 0xff;
 388                 data[off - init_off + 1] = (val >> 8) & 0xff;
 389                 off += 2;
 390                 size -= 2;
 391         }
 392
 393         if (size > 0) {
 394                 u8 val;
 395                 pci_user_read_config_byte(dev, off, &val);
 396                 data[off - init_off] = val;
 397                 off++;
 398                 --size;
 399         }
 400
 401         return count;
 402 }
 403
 404 static ssize_t
 405 pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 406                  char *buf, loff_t off, size_t count)
 407 {
 408         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 409         unsigned int size = count;
 410         loff_t init_off = off;
 411         u8 *data = (u8*) buf;
 412
 413         if (off > dev->cfg_size)
 414                 return 0;
 415         if (off + count > dev->cfg_size) {
 416                 size = dev->cfg_size - off;
 417                 count = size;
 418         }
 419
 420         if ((off & 1) && size) {
 421                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 422                 off++;
 423                 size--;
 424         }
 425
 426         if ((off & 3) && size > 2) {
 427                 u16 val = data[off - init_off];
 428                 val |= (u16) data[off - init_off + 1] << 8;
 429                 pci_user_write_config_word(dev, off, val);
 430                 off += 2;
 431                 size -= 2;
 432         }
 433
 434         while (size > 3) {
 435                 u32 val = data[off - init_off];
 436                 val |= (u32) data[off - init_off + 1] << 8;
 437                 val |= (u32) data[off - init_off + 2] << 16;
 438                 val |= (u32) data[off - init_off + 3] << 24;
 439                 pci_user_write_config_dword(dev, off, val);
 440                 off += 4;
 441                 size -= 4;
 442         }
 443
 444         if (size >= 2) {
 445                 u16 val = data[off - init_off];
 446                 val |= (u16) data[off - init_off + 1] << 8;
 447                 pci_user_write_config_word(dev, off, val);
 448                 off += 2;
 449                 size -= 2;
 450         }
 451
 452         if (size) {
 453                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 454                 off++;
 455                 --size;
 456         }
 457
 458         return count;
 459 }
 460
 461 static ssize_t
 462 read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
 463               char *buf, loff_t off, size_t count)
 464 {
 465         struct pci_dev *dev =
 466                 to_pci_dev(container_of(kobj, struct device, kobj));
 467
 468         if (off > bin_attr->size)
 469                 count = 0;
 470         else if (count > bin_attr->size - off)
 471                 count = bin_attr->size - off;
 472
 473         return pci_read_vpd(dev, off, count, buf);
 474 }
 475
 476 static ssize_t
 477 write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
 478                char *buf, loff_t off, size_t count)
 479 {
 480         struct pci_dev *dev =
 481                 to_pci_dev(container_of(kobj, struct device, kobj));
 482
 483         if (off > bin_attr->size)
 484                 count = 0;
 485         else if (count > bin_attr->size - off)
 486                 count = bin_attr->size - off;
 487
 488         return pci_write_vpd(dev, off, count, buf);
 489 }
 490
 491 #ifdef HAVE_PCI_LEGACY
 492 /**
 493  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 494  * @kobj: kobject corresponding to file to read from
 495  * @bin_attr: struct bin_attribute for this file
 496  * @buf: buffer to store results
 497  * @off: offset into legacy I/O port space
 498  * @count: number of bytes to read
 499  *
 500  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 501  * callback routine (pci_legacy_read).
 502  */
 503 static ssize_t
 504 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 505                    char *buf, loff_t off, size_t count)
 506 {
 507         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 508                                                       struct device,
 509                                                       kobj));
 510
 511         /* Only support 1, 2 or 4 byte accesses */
 512         if (count != 1 && count != 2 && count != 4)
 513                 return -EINVAL;
 514
 515         return pci_legacy_read(bus, off, (u32 *)buf, count);
 516 }
 517
 518 /**
 519  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 520  * @kobj: kobject corresponding to file to read from
 521  * @bin_attr: struct bin_attribute for this file
 522  * @buf: buffer containing value to be written
 523  * @off: offset into legacy I/O port space
 524  * @count: number of bytes to write
 525  *
 526  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 527  * callback routine (pci_legacy_write).
 528  */
 529 static ssize_t
 530 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 531                     char *buf, loff_t off, size_t count)
 532 {
 533         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 534                                                       struct device,
 535                                                       kobj));
 536         /* Only support 1, 2 or 4 byte accesses */
 537         if (count != 1 && count != 2 && count != 4)
 538                 return -EINVAL;
 539
 540         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 541 }
 542
 543 /**
 544  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 545  * @kobj: kobject corresponding to device to be mapped
 546  * @attr: struct bin_attribute for this file
 547  * @vma: struct vm_area_struct passed to mmap
 548  *
 549  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 550  * legacy memory space (first meg of bus space) into application virtual
 551  * memory space.
 552  */
 553 static int
 554 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 555                     struct vm_area_struct *vma)
 556 {
 557         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 558                                                       struct device,
 559                                                       kobj));
 560
 561         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 562 }
 563
 564 /**
 565  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 566  * @kobj: kobject corresponding to device to be mapped
 567  * @attr: struct bin_attribute for this file
 568  * @vma: struct vm_area_struct passed to mmap
 569  *
 570  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 571  * legacy IO space (first meg of bus space) into application virtual
 572  * memory space. Returns -ENOSYS if the operation isn't supported
 573  */
 574 static int
 575 pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
 576                    struct vm_area_struct *vma)
 577 {
 578         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 579                                                       struct device,
 580                                                       kobj));
 581
 582         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 583 }
 584
 585 /**
 586  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 587  * @b: bus to create files under
 588  * @mmap_type: I/O port or memory
 589  *
 590  * Stub implementation. Can be overridden by arch if necessary.
 591  */
 592 void __weak
 593 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 594 {
 595         return;
 596 }
 597
 598 /**
 599  * pci_create_legacy_files - create legacy I/O port and memory files
 600  * @b: bus to create files under
 601  *
 602  * Some platforms allow access to legacy I/O port and ISA memory space on
 603  * a per-bus basis.  This routine creates the files and ties them into
 604  * their associated read, write and mmap files from pci-sysfs.c
 605  *
 606  * On error unwind, but don't propogate the error to the caller
 607  * as it is ok to set up the PCI bus without these files.
 608  */
 609 void pci_create_legacy_files(struct pci_bus *b)
 610 {
 611         int error;
 612
 613         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 614                                GFP_ATOMIC);
 615         if (!b->legacy_io)
 616                 goto kzalloc_err;
 617
 618         b->legacy_io->attr.name = "legacy_io";
 619         b->legacy_io->size = 0xffff;
 620         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 621         b->legacy_io->read = pci_read_legacy_io;
 622         b->legacy_io->write = pci_write_legacy_io;
 623         b->legacy_io->mmap = pci_mmap_legacy_io;
 624         pci_adjust_legacy_attr(b, pci_mmap_io);
 625         error = device_create_bin_file(&b->dev, b->legacy_io);
 626         if (error)
 627                 goto legacy_io_err;
 628
 629         /* Allocated above after the legacy_io struct */
 630         b->legacy_mem = b->legacy_io + 1;
 631         b->legacy_mem->attr.name = "legacy_mem";
 632         b->legacy_mem->size = 1024*1024;
 633         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 634         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 635         pci_adjust_legacy_attr(b, pci_mmap_mem);
 636         error = device_create_bin_file(&b->dev, b->legacy_mem);
 637         if (error)
 638                 goto legacy_mem_err;
 639
 640         return;
 641
 642 legacy_mem_err:
 643         device_remove_bin_file(&b->dev, b->legacy_io);
 644 legacy_io_err:
 645         kfree(b->legacy_io);
 646         b->legacy_io = NULL;
 647 kzalloc_err:
 648         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 649                "and ISA memory resources to sysfs\n");
 650         return;
 651 }
 652
 653 void pci_remove_legacy_files(struct pci_bus *b)
 654 {
 655         if (b->legacy_io) {
 656                 device_remove_bin_file(&b->dev, b->legacy_io);
 657                 device_remove_bin_file(&b->dev, b->legacy_mem);
 658                 kfree(b->legacy_io); /* both are allocated here */
 659         }
 660 }
 661 #endif /* HAVE_PCI_LEGACY */
 662
 663 #ifdef HAVE_PCI_MMAP
 664
 665 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
 666 {
 667         unsigned long nr, start, size;
 668
 669         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 670         start = vma->vm_pgoff;
 671         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 672         if (start < size && size - start >= nr)
 673                 return 1;
 674         WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
 675                 current->comm, start, start+nr, pci_name(pdev), resno, size);
 676         return 0;
 677 }
 678
 679 /**
 680  * pci_mmap_resource - map a PCI resource into user memory space
 681  * @kobj: kobject for mapping
 682  * @attr: struct bin_attribute for the file being mapped
 683  * @vma: struct vm_area_struct passed into the mmap
 684  * @write_combine: 1 for write_combine mapping
 685  *
 686  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 687  */
 688 static int
 689 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 690                   struct vm_area_struct *vma, int write_combine)
 691 {
 692         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 693                                                        struct device, kobj));
 694         struct resource *res = (struct resource *)attr->private;
 695         enum pci_mmap_state mmap_type;
 696         resource_size_t start, end;
 697         int i;
 698
 699         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 700                 if (res == &pdev->resource[i])
 701                         break;
 702         if (i >= PCI_ROM_RESOURCE)
 703                 return -ENODEV;
 704
 705         if (!pci_mmap_fits(pdev, i, vma))
 706                 return -EINVAL;
 707
 708         /* pci_mmap_page_range() expects the same kind of entry as coming
 709          * from /proc/bus/pci/ which is a "user visible" value. If this is
 710          * different from the resource itself, arch will do necessary fixup.
 711          */
 712         pci_resource_to_user(pdev, i, res, &start, &end);
 713         vma->vm_pgoff += start >> PAGE_SHIFT;
 714         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 715
 716         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 717                 return -EINVAL;
 718
 719         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 720 }
 721
 722 static int
 723 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
 724                      struct vm_area_struct *vma)
 725 {
 726         return pci_mmap_resource(kobj, attr, vma, 0);
 727 }
 728
 729 static int
 730 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
 731                      struct vm_area_struct *vma)
 732 {
 733         return pci_mmap_resource(kobj, attr, vma, 1);
 734 }
 735
 736 /**
 737  * pci_remove_resource_files - cleanup resource files
 738  * @pdev: dev to cleanup
 739  *
 740  * If we created resource files for @pdev, remove them from sysfs and
 741  * free their resources.
 742  */
 743 static void
 744 pci_remove_resource_files(struct pci_dev *pdev)
 745 {
 746         int i;
 747
 748         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 749                 struct bin_attribute *res_attr;
 750
 751                 res_attr = pdev->res_attr[i];
 752                 if (res_attr) {
 753                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 754                         kfree(res_attr);
 755                 }
 756
 757                 res_attr = pdev->res_attr_wc[i];
 758                 if (res_attr) {
 759                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 760                         kfree(res_attr);
 761                 }
 762         }
 763 }
 764
 765 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 766 {
 767         /* allocate attribute structure, piggyback attribute name */
 768         int name_len = write_combine ? 13 : 10;
 769         struct bin_attribute *res_attr;
 770         int retval;
 771
 772         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 773         if (res_attr) {
 774                 char *res_attr_name = (char *)(res_attr + 1);
 775
 776                 if (write_combine) {
 777                         pdev->res_attr_wc[num] = res_attr;
 778                         sprintf(res_attr_name, "resource%d_wc", num);
 779                         res_attr->mmap = pci_mmap_resource_wc;
 780                 } else {
 781                         pdev->res_attr[num] = res_attr;
 782                         sprintf(res_attr_name, "resource%d", num);
 783                         res_attr->mmap = pci_mmap_resource_uc;
 784                 }
 785                 res_attr->attr.name = res_attr_name;
 786                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 787                 res_attr->size = pci_resource_len(pdev, num);
 788                 res_attr->private = &pdev->resource[num];
 789                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 790         } else
 791                 retval = -ENOMEM;
 792
 793         return retval;
 794 }
 795
 796 /**
 797  * pci_create_resource_files - create resource files in sysfs for @dev
 798  * @pdev: dev in question
 799  *
 800  * Walk the resources in @pdev creating files for each resource available.
 801  */
 802 static int pci_create_resource_files(struct pci_dev *pdev)
 803 {
 804         int i;
 805         int retval;
 806
 807         /* Expose the PCI resources from this device as files */
 808         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 809
 810                 /* skip empty resources */
 811                 if (!pci_resource_len(pdev, i))
 812                         continue;
 813
 814                 retval = pci_create_attr(pdev, i, 0);
 815                 /* for prefetchable resources, create a WC mappable file */
 816                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 817                         retval = pci_create_attr(pdev, i, 1);
 818
 819                 if (retval) {
 820                         pci_remove_resource_files(pdev);
 821                         return retval;
 822                 }
 823         }
 824         return 0;
 825 }
 826 #else /* !HAVE_PCI_MMAP */
 827 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
 828 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
 829 #endif /* HAVE_PCI_MMAP */
 830
 831 /**
 832  * pci_write_rom - used to enable access to the PCI ROM display
 833  * @kobj: kernel object handle
 834  * @bin_attr: struct bin_attribute for this file
 835  * @buf: user input
 836  * @off: file offset
 837  * @count: number of byte in input
 838  *
 839  * writing anything except 0 enables it
 840  */
 841 static ssize_t
 842 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 843               char *buf, loff_t off, size_t count)
 844 {
 845         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 846
 847         if ((off ==  0) && (*buf == '0') && (count == 2))
 848                 pdev->rom_attr_enabled = 0;
 849         else
 850                 pdev->rom_attr_enabled = 1;
 851
 852         return count;
 853 }
 854
 855 /**
 856  * pci_read_rom - read a PCI ROM
 857  * @kobj: kernel object handle
 858  * @bin_attr: struct bin_attribute for this file
 859  * @buf: where to put the data we read from the ROM
 860  * @off: file offset
 861  * @count: number of bytes to read
 862  *
 863  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 864  * device corresponding to @kobj.
 865  */
 866 static ssize_t
 867 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 868              char *buf, loff_t off, size_t count)
 869 {
 870         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 871         void __iomem *rom;
 872         size_t size;
 873
 874         if (!pdev->rom_attr_enabled)
 875                 return -EINVAL;
 876
 877         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 878         if (!rom || !size)
 879                 return -EIO;
 880
 881         if (off >= size)
 882                 count = 0;
 883         else {
 884                 if (off + count > size)
 885                         count = size - off;
 886
 887                 memcpy_fromio(buf, rom + off, count);
 888         }
 889         pci_unmap_rom(pdev, rom);
 890
 891         return count;
 892 }
 893
 894 static struct bin_attribute pci_config_attr = {
 895         .attr = {
 896                 .name = "config",
 897                 .mode = S_IRUGO | S_IWUSR,
 898         },
 899         .size = PCI_CFG_SPACE_SIZE,
 900         .read = pci_read_config,
 901         .write = pci_write_config,
 902 };
 903
 904 static struct bin_attribute pcie_config_attr = {
 905         .attr = {
 906                 .name = "config",
 907                 .mode = S_IRUGO | S_IWUSR,
 908         },
 909         .size = PCI_CFG_SPACE_EXP_SIZE,
 910         .read = pci_read_config,
 911         .write = pci_write_config,
 912 };
 913
 914 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 915 {
 916         return 0;
 917 }
 918
 919 static ssize_t reset_store(struct device *dev,
 920                            struct device_attribute *attr, const char *buf,
 921                            size_t count)
 922 {
 923         struct pci_dev *pdev = to_pci_dev(dev);
 924         unsigned long val;
 925         ssize_t result = strict_strtoul(buf, 0, &val);
 926
 927         if (result < 0)
 928                 return result;
 929
 930         if (val != 1)
 931                 return -EINVAL;
 932         return pci_reset_function(pdev);
 933 }
 934
 935 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
 936
 937 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
 938 {
 939         int retval;
 940         struct bin_attribute *attr;
 941
 942         /* If the device has VPD, try to expose it in sysfs. */
 943         if (dev->vpd) {
 944                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 945                 if (!attr)
 946                         return -ENOMEM;
 947
 948                 attr->size = dev->vpd->len;
 949                 attr->attr.name = "vpd";
 950                 attr->attr.mode = S_IRUSR | S_IWUSR;
 951                 attr->read = read_vpd_attr;
 952                 attr->write = write_vpd_attr;
 953                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
 954                 if (retval) {
 955                         kfree(dev->vpd->attr);
 956                         return retval;
 957                 }
 958                 dev->vpd->attr = attr;
 959         }
 960
 961         /* Active State Power Management */
 962         pcie_aspm_create_sysfs_dev_files(dev);
 963
 964         if (!pci_probe_reset_function(dev)) {
 965                 retval = device_create_file(&dev->dev, &reset_attr);
 966                 if (retval)
 967                         goto error;
 968                 dev->reset_fn = 1;
 969         }
 970         return 0;
 971
 972 error:
 973         pcie_aspm_remove_sysfs_dev_files(dev);
 974         if (dev->vpd && dev->vpd->attr) {
 975                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
 976                 kfree(dev->vpd->attr);
 977         }
 978
 979         return retval;
 980 }
 981
 982 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 983 {
 984         int retval;
 985         int rom_size = 0;
 986         struct bin_attribute *attr;
 987
 988         if (!sysfs_initialized)
 989                 return -EACCES;
 990
 991         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 992                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 993         else
 994                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 995         if (retval)
 996                 goto err;
 997
 998         retval = pci_create_resource_files(pdev);
 999         if (retval)
1000                 goto err_config_file;
1001
1002         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1003                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1004         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1005                 rom_size = 0x20000;
1006
1007         /* If the device has a ROM, try to expose it in sysfs. */
1008         if (rom_size) {
1009                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1010                 if (!attr) {
1011                         retval = -ENOMEM;
1012                         goto err_resource_files;
1013                 }
1014                 attr->size = rom_size;
1015                 attr->attr.name = "rom";
1016                 attr->attr.mode = S_IRUSR;
1017                 attr->read = pci_read_rom;
1018                 attr->write = pci_write_rom;
1019                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1020                 if (retval) {
1021                         kfree(attr);
1022                         goto err_resource_files;
1023                 }
1024                 pdev->rom_attr = attr;
1025         }
1026
1027         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1028                 retval = device_create_file(&pdev->dev, &vga_attr);
1029                 if (retval)
1030                         goto err_rom_file;
1031         }
1032
1033         /* add platform-specific attributes */
1034         retval = pcibios_add_platform_entries(pdev);
1035         if (retval)
1036                 goto err_vga_file;
1037
1038         /* add sysfs entries for various capabilities */
1039         retval = pci_create_capabilities_sysfs(pdev);
1040         if (retval)
1041                 goto err_vga_file;
1042
1043         return 0;
1044
1045 err_vga_file:
1046         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1047                 device_remove_file(&pdev->dev, &vga_attr);
1048 err_rom_file:
1049         if (rom_size) {
1050                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1051                 kfree(pdev->rom_attr);
1052                 pdev->rom_attr = NULL;
1053         }
1054 err_resource_files:
1055         pci_remove_resource_files(pdev);
1056 err_config_file:
1057         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1058                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1059         else
1060                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1061 err:
1062         return retval;
1063 }
1064
1065 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1066 {
1067         if (dev->vpd && dev->vpd->attr) {
1068                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1069                 kfree(dev->vpd->attr);
1070         }
1071
1072         pcie_aspm_remove_sysfs_dev_files(dev);
1073         if (dev->reset_fn) {
1074                 device_remove_file(&dev->dev, &reset_attr);
1075                 dev->reset_fn = 0;
1076         }
1077 }
1078
1079 /**
1080  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1081  * @pdev: device whose entries we should free
1082  *
1083  * Cleanup when @pdev is removed from sysfs.
1084  */
1085 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1086 {
1087         int rom_size = 0;
1088
1089         if (!sysfs_initialized)
1090                 return;
1091
1092         pci_remove_capabilities_sysfs(pdev);
1093
1094         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1095                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1096         else
1097                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1098
1099         pci_remove_resource_files(pdev);
1100
1101         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1102                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1103         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1104                 rom_size = 0x20000;
1105
1106         if (rom_size && pdev->rom_attr) {
1107                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1108                 kfree(pdev->rom_attr);
1109         }
1110 }
1111
1112 static int __init pci_sysfs_init(void)
1113 {
1114         struct pci_dev *pdev = NULL;
1115         int retval;
1116
1117         sysfs_initialized = 1;
1118         for_each_pci_dev(pdev) {
1119                 retval = pci_create_sysfs_dev_files(pdev);
1120                 if (retval) {
1121                         pci_dev_put(pdev);
1122                         return retval;
1123                 }
1124         }
1125
1126         return 0;
1127 }
1128
1129 late_initcall(pci_sysfs_init);