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