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  * @buf: buffer to store results
 496  * @off: offset into legacy I/O port space
 497  * @count: number of bytes to read
 498  *
 499  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 500  * callback routine (pci_legacy_read).
 501  */
 502 static ssize_t
 503 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 504                    char *buf, loff_t off, size_t count)
 505 {
 506         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 507                                                       struct device,
 508                                                       kobj));
 509
 510         /* Only support 1, 2 or 4 byte accesses */
 511         if (count != 1 && count != 2 && count != 4)
 512                 return -EINVAL;
 513
 514         return pci_legacy_read(bus, off, (u32 *)buf, count);
 515 }
 516
 517 /**
 518  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 519  * @kobj: kobject corresponding to file to read from
 520  * @buf: buffer containing value to be written
 521  * @off: offset into legacy I/O port space
 522  * @count: number of bytes to write
 523  *
 524  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 525  * callback routine (pci_legacy_write).
 526  */
 527 static ssize_t
 528 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 529                     char *buf, loff_t off, size_t count)
 530 {
 531         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 532                                                       struct device,
 533                                                       kobj));
 534         /* Only support 1, 2 or 4 byte accesses */
 535         if (count != 1 && count != 2 && count != 4)
 536                 return -EINVAL;
 537
 538         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 539 }
 540
 541 /**
 542  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 543  * @kobj: kobject corresponding to device to be mapped
 544  * @attr: struct bin_attribute for this file
 545  * @vma: struct vm_area_struct passed to mmap
 546  *
 547  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 548  * legacy memory space (first meg of bus space) into application virtual
 549  * memory space.
 550  */
 551 static int
 552 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 553                     struct vm_area_struct *vma)
 554 {
 555         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 556                                                       struct device,
 557                                                       kobj));
 558
 559         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 560 }
 561
 562 /**
 563  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 564  * @kobj: kobject corresponding to device to be mapped
 565  * @attr: struct bin_attribute for this file
 566  * @vma: struct vm_area_struct passed to mmap
 567  *
 568  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 569  * legacy IO space (first meg of bus space) into application virtual
 570  * memory space. Returns -ENOSYS if the operation isn't supported
 571  */
 572 static int
 573 pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
 574                    struct vm_area_struct *vma)
 575 {
 576         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 577                                                       struct device,
 578                                                       kobj));
 579
 580         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 581 }
 582
 583 /**
 584  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 585  * @b: bus to create files under
 586  * @mmap_type: I/O port or memory
 587  *
 588  * Stub implementation. Can be overridden by arch if necessary.
 589  */
 590 void __weak
 591 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 592 {
 593         return;
 594 }
 595
 596 /**
 597  * pci_create_legacy_files - create legacy I/O port and memory files
 598  * @b: bus to create files under
 599  *
 600  * Some platforms allow access to legacy I/O port and ISA memory space on
 601  * a per-bus basis.  This routine creates the files and ties them into
 602  * their associated read, write and mmap files from pci-sysfs.c
 603  *
 604  * On error unwind, but don't propogate the error to the caller
 605  * as it is ok to set up the PCI bus without these files.
 606  */
 607 void pci_create_legacy_files(struct pci_bus *b)
 608 {
 609         int error;
 610
 611         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 612                                GFP_ATOMIC);
 613         if (!b->legacy_io)
 614                 goto kzalloc_err;
 615
 616         b->legacy_io->attr.name = "legacy_io";
 617         b->legacy_io->size = 0xffff;
 618         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 619         b->legacy_io->read = pci_read_legacy_io;
 620         b->legacy_io->write = pci_write_legacy_io;
 621         b->legacy_io->mmap = pci_mmap_legacy_io;
 622         pci_adjust_legacy_attr(b, pci_mmap_io);
 623         error = device_create_bin_file(&b->dev, b->legacy_io);
 624         if (error)
 625                 goto legacy_io_err;
 626
 627         /* Allocated above after the legacy_io struct */
 628         b->legacy_mem = b->legacy_io + 1;
 629         b->legacy_mem->attr.name = "legacy_mem";
 630         b->legacy_mem->size = 1024*1024;
 631         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 632         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 633         pci_adjust_legacy_attr(b, pci_mmap_mem);
 634         error = device_create_bin_file(&b->dev, b->legacy_mem);
 635         if (error)
 636                 goto legacy_mem_err;
 637
 638         return;
 639
 640 legacy_mem_err:
 641         device_remove_bin_file(&b->dev, b->legacy_io);
 642 legacy_io_err:
 643         kfree(b->legacy_io);
 644         b->legacy_io = NULL;
 645 kzalloc_err:
 646         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 647                "and ISA memory resources to sysfs\n");
 648         return;
 649 }
 650
 651 void pci_remove_legacy_files(struct pci_bus *b)
 652 {
 653         if (b->legacy_io) {
 654                 device_remove_bin_file(&b->dev, b->legacy_io);
 655                 device_remove_bin_file(&b->dev, b->legacy_mem);
 656                 kfree(b->legacy_io); /* both are allocated here */
 657         }
 658 }
 659 #endif /* HAVE_PCI_LEGACY */
 660
 661 #ifdef HAVE_PCI_MMAP
 662
 663 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
 664 {
 665         unsigned long nr, start, size;
 666
 667         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 668         start = vma->vm_pgoff;
 669         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 670         if (start < size && size - start >= nr)
 671                 return 1;
 672         WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
 673                 current->comm, start, start+nr, pci_name(pdev), resno, size);
 674         return 0;
 675 }
 676
 677 /**
 678  * pci_mmap_resource - map a PCI resource into user memory space
 679  * @kobj: kobject for mapping
 680  * @attr: struct bin_attribute for the file being mapped
 681  * @vma: struct vm_area_struct passed into the mmap
 682  * @write_combine: 1 for write_combine mapping
 683  *
 684  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 685  */
 686 static int
 687 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 688                   struct vm_area_struct *vma, int write_combine)
 689 {
 690         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 691                                                        struct device, kobj));
 692         struct resource *res = (struct resource *)attr->private;
 693         enum pci_mmap_state mmap_type;
 694         resource_size_t start, end;
 695         int i;
 696
 697         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 698                 if (res == &pdev->resource[i])
 699                         break;
 700         if (i >= PCI_ROM_RESOURCE)
 701                 return -ENODEV;
 702
 703         if (!pci_mmap_fits(pdev, i, vma))
 704                 return -EINVAL;
 705
 706         /* pci_mmap_page_range() expects the same kind of entry as coming
 707          * from /proc/bus/pci/ which is a "user visible" value. If this is
 708          * different from the resource itself, arch will do necessary fixup.
 709          */
 710         pci_resource_to_user(pdev, i, res, &start, &end);
 711         vma->vm_pgoff += start >> PAGE_SHIFT;
 712         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 713
 714         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 715                 return -EINVAL;
 716
 717         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 718 }
 719
 720 static int
 721 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
 722                      struct vm_area_struct *vma)
 723 {
 724         return pci_mmap_resource(kobj, attr, vma, 0);
 725 }
 726
 727 static int
 728 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
 729                      struct vm_area_struct *vma)
 730 {
 731         return pci_mmap_resource(kobj, attr, vma, 1);
 732 }
 733
 734 /**
 735  * pci_remove_resource_files - cleanup resource files
 736  * @dev: dev to cleanup
 737  *
 738  * If we created resource files for @dev, remove them from sysfs and
 739  * free their resources.
 740  */
 741 static void
 742 pci_remove_resource_files(struct pci_dev *pdev)
 743 {
 744         int i;
 745
 746         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 747                 struct bin_attribute *res_attr;
 748
 749                 res_attr = pdev->res_attr[i];
 750                 if (res_attr) {
 751                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 752                         kfree(res_attr);
 753                 }
 754
 755                 res_attr = pdev->res_attr_wc[i];
 756                 if (res_attr) {
 757                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 758                         kfree(res_attr);
 759                 }
 760         }
 761 }
 762
 763 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 764 {
 765         /* allocate attribute structure, piggyback attribute name */
 766         int name_len = write_combine ? 13 : 10;
 767         struct bin_attribute *res_attr;
 768         int retval;
 769
 770         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 771         if (res_attr) {
 772                 char *res_attr_name = (char *)(res_attr + 1);
 773
 774                 if (write_combine) {
 775                         pdev->res_attr_wc[num] = res_attr;
 776                         sprintf(res_attr_name, "resource%d_wc", num);
 777                         res_attr->mmap = pci_mmap_resource_wc;
 778                 } else {
 779                         pdev->res_attr[num] = res_attr;
 780                         sprintf(res_attr_name, "resource%d", num);
 781                         res_attr->mmap = pci_mmap_resource_uc;
 782                 }
 783                 res_attr->attr.name = res_attr_name;
 784                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 785                 res_attr->size = pci_resource_len(pdev, num);
 786                 res_attr->private = &pdev->resource[num];
 787                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 788         } else
 789                 retval = -ENOMEM;
 790
 791         return retval;
 792 }
 793
 794 /**
 795  * pci_create_resource_files - create resource files in sysfs for @dev
 796  * @dev: dev in question
 797  *
 798  * Walk the resources in @dev creating files for each resource available.
 799  */
 800 static int pci_create_resource_files(struct pci_dev *pdev)
 801 {
 802         int i;
 803         int retval;
 804
 805         /* Expose the PCI resources from this device as files */
 806         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 807
 808                 /* skip empty resources */
 809                 if (!pci_resource_len(pdev, i))
 810                         continue;
 811
 812                 retval = pci_create_attr(pdev, i, 0);
 813                 /* for prefetchable resources, create a WC mappable file */
 814                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 815                         retval = pci_create_attr(pdev, i, 1);
 816
 817                 if (retval) {
 818                         pci_remove_resource_files(pdev);
 819                         return retval;
 820                 }
 821         }
 822         return 0;
 823 }
 824 #else /* !HAVE_PCI_MMAP */
 825 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
 826 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
 827 #endif /* HAVE_PCI_MMAP */
 828
 829 /**
 830  * pci_write_rom - used to enable access to the PCI ROM display
 831  * @kobj: kernel object handle
 832  * @buf: user input
 833  * @off: file offset
 834  * @count: number of byte in input
 835  *
 836  * writing anything except 0 enables it
 837  */
 838 static ssize_t
 839 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 840               char *buf, loff_t off, size_t count)
 841 {
 842         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 843
 844         if ((off ==  0) && (*buf == '0') && (count == 2))
 845                 pdev->rom_attr_enabled = 0;
 846         else
 847                 pdev->rom_attr_enabled = 1;
 848
 849         return count;
 850 }
 851
 852 /**
 853  * pci_read_rom - read a PCI ROM
 854  * @kobj: kernel object handle
 855  * @buf: where to put the data we read from the ROM
 856  * @off: file offset
 857  * @count: number of bytes to read
 858  *
 859  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 860  * device corresponding to @kobj.
 861  */
 862 static ssize_t
 863 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 864              char *buf, loff_t off, size_t count)
 865 {
 866         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 867         void __iomem *rom;
 868         size_t size;
 869
 870         if (!pdev->rom_attr_enabled)
 871                 return -EINVAL;
 872
 873         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 874         if (!rom || !size)
 875                 return -EIO;
 876
 877         if (off >= size)
 878                 count = 0;
 879         else {
 880                 if (off + count > size)
 881                         count = size - off;
 882
 883                 memcpy_fromio(buf, rom + off, count);
 884         }
 885         pci_unmap_rom(pdev, rom);
 886
 887         return count;
 888 }
 889
 890 static struct bin_attribute pci_config_attr = {
 891         .attr = {
 892                 .name = "config",
 893                 .mode = S_IRUGO | S_IWUSR,
 894         },
 895         .size = PCI_CFG_SPACE_SIZE,
 896         .read = pci_read_config,
 897         .write = pci_write_config,
 898 };
 899
 900 static struct bin_attribute pcie_config_attr = {
 901         .attr = {
 902                 .name = "config",
 903                 .mode = S_IRUGO | S_IWUSR,
 904         },
 905         .size = PCI_CFG_SPACE_EXP_SIZE,
 906         .read = pci_read_config,
 907         .write = pci_write_config,
 908 };
 909
 910 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 911 {
 912         return 0;
 913 }
 914
 915 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
 916 {
 917         int retval;
 918         struct bin_attribute *attr;
 919
 920         /* If the device has VPD, try to expose it in sysfs. */
 921         if (dev->vpd) {
 922                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 923                 if (!attr)
 924                         return -ENOMEM;
 925
 926                 attr->size = dev->vpd->len;
 927                 attr->attr.name = "vpd";
 928                 attr->attr.mode = S_IRUSR | S_IWUSR;
 929                 attr->read = read_vpd_attr;
 930                 attr->write = write_vpd_attr;
 931                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
 932                 if (retval) {
 933                         kfree(dev->vpd->attr);
 934                         return retval;
 935                 }
 936                 dev->vpd->attr = attr;
 937         }
 938
 939         /* Active State Power Management */
 940         pcie_aspm_create_sysfs_dev_files(dev);
 941
 942         return 0;
 943 }
 944
 945 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 946 {
 947         int retval;
 948         int rom_size = 0;
 949         struct bin_attribute *attr;
 950
 951         if (!sysfs_initialized)
 952                 return -EACCES;
 953
 954         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 955                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 956         else
 957                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 958         if (retval)
 959                 goto err;
 960
 961         retval = pci_create_resource_files(pdev);
 962         if (retval)
 963                 goto err_config_file;
 964
 965         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
 966                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 967         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
 968                 rom_size = 0x20000;
 969
 970         /* If the device has a ROM, try to expose it in sysfs. */
 971         if (rom_size) {
 972                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 973                 if (!attr) {
 974                         retval = -ENOMEM;
 975                         goto err_resource_files;
 976                 }
 977                 attr->size = rom_size;
 978                 attr->attr.name = "rom";
 979                 attr->attr.mode = S_IRUSR;
 980                 attr->read = pci_read_rom;
 981                 attr->write = pci_write_rom;
 982                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
 983                 if (retval) {
 984                         kfree(attr);
 985                         goto err_resource_files;
 986                 }
 987                 pdev->rom_attr = attr;
 988         }
 989
 990         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
 991                 retval = device_create_file(&pdev->dev, &vga_attr);
 992                 if (retval)
 993                         goto err_rom_file;
 994         }
 995
 996         /* add platform-specific attributes */
 997         retval = pcibios_add_platform_entries(pdev);
 998         if (retval)
 999                 goto err_vga_file;
1000
1001         /* add sysfs entries for various capabilities */
1002         retval = pci_create_capabilities_sysfs(pdev);
1003         if (retval)
1004                 goto err_vga_file;
1005
1006         return 0;
1007
1008 err_vga_file:
1009         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1010                 device_remove_file(&pdev->dev, &vga_attr);
1011 err_rom_file:
1012         if (rom_size) {
1013                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1014                 kfree(pdev->rom_attr);
1015                 pdev->rom_attr = NULL;
1016         }
1017 err_resource_files:
1018         pci_remove_resource_files(pdev);
1019 err_config_file:
1020         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1021                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1022         else
1023                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1024 err:
1025         return retval;
1026 }
1027
1028 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1029 {
1030         if (dev->vpd && dev->vpd->attr) {
1031                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1032                 kfree(dev->vpd->attr);
1033         }
1034
1035         pcie_aspm_remove_sysfs_dev_files(dev);
1036 }
1037
1038 /**
1039  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1040  * @pdev: device whose entries we should free
1041  *
1042  * Cleanup when @pdev is removed from sysfs.
1043  */
1044 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1045 {
1046         int rom_size = 0;
1047
1048         if (!sysfs_initialized)
1049                 return;
1050
1051         pci_remove_capabilities_sysfs(pdev);
1052
1053         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1054                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1055         else
1056                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1057
1058         pci_remove_resource_files(pdev);
1059
1060         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1061                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1062         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1063                 rom_size = 0x20000;
1064
1065         if (rom_size && pdev->rom_attr) {
1066                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1067                 kfree(pdev->rom_attr);
1068         }
1069 }
1070
1071 static int __init pci_sysfs_init(void)
1072 {
1073         struct pci_dev *pdev = NULL;
1074         int retval;
1075
1076         sysfs_initialized = 1;
1077         for_each_pci_dev(pdev) {
1078                 retval = pci_create_sysfs_dev_files(pdev);
1079                 if (retval) {
1080                         pci_dev_put(pdev);
1081                         return retval;
1082                 }
1083         }
1084
1085         return 0;
1086 }
1087
1088 late_initcall(pci_sysfs_init);