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                   enum pci_mmap_api mmap_api)
 694 {
 695         unsigned long nr, start, size, pci_start;
 696
 697         if (pci_resource_len(pdev, resno) == 0)
 698                 return 0;
 699         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 700         start = vma->vm_pgoff;
 701         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 702         pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 703                         pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 704         if (start >= pci_start && start < pci_start + size &&
 705                         start + nr <= pci_start + size)
 706                 return 1;
 707         return 0;
 708 }
 709
 710 /**
 711  * pci_mmap_resource - map a PCI resource into user memory space
 712  * @kobj: kobject for mapping
 713  * @attr: struct bin_attribute for the file being mapped
 714  * @vma: struct vm_area_struct passed into the mmap
 715  * @write_combine: 1 for write_combine mapping
 716  *
 717  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 718  */
 719 static int
 720 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 721                   struct vm_area_struct *vma, int write_combine)
 722 {
 723         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 724                                                        struct device, kobj));
 725         struct resource *res = (struct resource *)attr->private;
 726         enum pci_mmap_state mmap_type;
 727         resource_size_t start, end;
 728         int i;
 729
 730         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 731                 if (res == &pdev->resource[i])
 732                         break;
 733         if (i >= PCI_ROM_RESOURCE)
 734                 return -ENODEV;
 735
 736         if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
 737                 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
 738                         "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
 739                         current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
 740                         pci_name(pdev), i,
 741                         pci_resource_start(pdev, i), pci_resource_len(pdev, i));
 742                 return -EINVAL;
 743         }
 744
 745         /* pci_mmap_page_range() expects the same kind of entry as coming
 746          * from /proc/bus/pci/ which is a "user visible" value. If this is
 747          * different from the resource itself, arch will do necessary fixup.
 748          */
 749         pci_resource_to_user(pdev, i, res, &start, &end);
 750         vma->vm_pgoff += start >> PAGE_SHIFT;
 751         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 752
 753         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 754                 return -EINVAL;
 755
 756         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 757 }
 758
 759 static int
 760 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
 761                      struct vm_area_struct *vma)
 762 {
 763         return pci_mmap_resource(kobj, attr, vma, 0);
 764 }
 765
 766 static int
 767 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
 768                      struct vm_area_struct *vma)
 769 {
 770         return pci_mmap_resource(kobj, attr, vma, 1);
 771 }
 772
 773 /**
 774  * pci_remove_resource_files - cleanup resource files
 775  * @pdev: dev to cleanup
 776  *
 777  * If we created resource files for @pdev, remove them from sysfs and
 778  * free their resources.
 779  */
 780 static void
 781 pci_remove_resource_files(struct pci_dev *pdev)
 782 {
 783         int i;
 784
 785         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 786                 struct bin_attribute *res_attr;
 787
 788                 res_attr = pdev->res_attr[i];
 789                 if (res_attr) {
 790                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 791                         kfree(res_attr);
 792                 }
 793
 794                 res_attr = pdev->res_attr_wc[i];
 795                 if (res_attr) {
 796                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 797                         kfree(res_attr);
 798                 }
 799         }
 800 }
 801
 802 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 803 {
 804         /* allocate attribute structure, piggyback attribute name */
 805         int name_len = write_combine ? 13 : 10;
 806         struct bin_attribute *res_attr;
 807         int retval;
 808
 809         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 810         if (res_attr) {
 811                 char *res_attr_name = (char *)(res_attr + 1);
 812
 813                 if (write_combine) {
 814                         pdev->res_attr_wc[num] = res_attr;
 815                         sprintf(res_attr_name, "resource%d_wc", num);
 816                         res_attr->mmap = pci_mmap_resource_wc;
 817                 } else {
 818                         pdev->res_attr[num] = res_attr;
 819                         sprintf(res_attr_name, "resource%d", num);
 820                         res_attr->mmap = pci_mmap_resource_uc;
 821                 }
 822                 res_attr->attr.name = res_attr_name;
 823                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 824                 res_attr->size = pci_resource_len(pdev, num);
 825                 res_attr->private = &pdev->resource[num];
 826                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 827         } else
 828                 retval = -ENOMEM;
 829
 830         return retval;
 831 }
 832
 833 /**
 834  * pci_create_resource_files - create resource files in sysfs for @dev
 835  * @pdev: dev in question
 836  *
 837  * Walk the resources in @pdev creating files for each resource available.
 838  */
 839 static int pci_create_resource_files(struct pci_dev *pdev)
 840 {
 841         int i;
 842         int retval;
 843
 844         /* Expose the PCI resources from this device as files */
 845         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 846
 847                 /* skip empty resources */
 848                 if (!pci_resource_len(pdev, i))
 849                         continue;
 850
 851                 retval = pci_create_attr(pdev, i, 0);
 852                 /* for prefetchable resources, create a WC mappable file */
 853                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 854                         retval = pci_create_attr(pdev, i, 1);
 855
 856                 if (retval) {
 857                         pci_remove_resource_files(pdev);
 858                         return retval;
 859                 }
 860         }
 861         return 0;
 862 }
 863 #else /* !HAVE_PCI_MMAP */
 864 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
 865 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
 866 #endif /* HAVE_PCI_MMAP */
 867
 868 /**
 869  * pci_write_rom - used to enable access to the PCI ROM display
 870  * @kobj: kernel object handle
 871  * @bin_attr: struct bin_attribute for this file
 872  * @buf: user input
 873  * @off: file offset
 874  * @count: number of byte in input
 875  *
 876  * writing anything except 0 enables it
 877  */
 878 static ssize_t
 879 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 880               char *buf, loff_t off, size_t count)
 881 {
 882         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 883
 884         if ((off ==  0) && (*buf == '0') && (count == 2))
 885                 pdev->rom_attr_enabled = 0;
 886         else
 887                 pdev->rom_attr_enabled = 1;
 888
 889         return count;
 890 }
 891
 892 /**
 893  * pci_read_rom - read a PCI ROM
 894  * @kobj: kernel object handle
 895  * @bin_attr: struct bin_attribute for this file
 896  * @buf: where to put the data we read from the ROM
 897  * @off: file offset
 898  * @count: number of bytes to read
 899  *
 900  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 901  * device corresponding to @kobj.
 902  */
 903 static ssize_t
 904 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 905              char *buf, loff_t off, size_t count)
 906 {
 907         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 908         void __iomem *rom;
 909         size_t size;
 910
 911         if (!pdev->rom_attr_enabled)
 912                 return -EINVAL;
 913
 914         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 915         if (!rom || !size)
 916                 return -EIO;
 917
 918         if (off >= size)
 919                 count = 0;
 920         else {
 921                 if (off + count > size)
 922                         count = size - off;
 923
 924                 memcpy_fromio(buf, rom + off, count);
 925         }
 926         pci_unmap_rom(pdev, rom);
 927
 928         return count;
 929 }
 930
 931 static struct bin_attribute pci_config_attr = {
 932         .attr = {
 933                 .name = "config",
 934                 .mode = S_IRUGO | S_IWUSR,
 935         },
 936         .size = PCI_CFG_SPACE_SIZE,
 937         .read = pci_read_config,
 938         .write = pci_write_config,
 939 };
 940
 941 static struct bin_attribute pcie_config_attr = {
 942         .attr = {
 943                 .name = "config",
 944                 .mode = S_IRUGO | S_IWUSR,
 945         },
 946         .size = PCI_CFG_SPACE_EXP_SIZE,
 947         .read = pci_read_config,
 948         .write = pci_write_config,
 949 };
 950
 951 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 952 {
 953         return 0;
 954 }
 955
 956 static ssize_t reset_store(struct device *dev,
 957                            struct device_attribute *attr, const char *buf,
 958                            size_t count)
 959 {
 960         struct pci_dev *pdev = to_pci_dev(dev);
 961         unsigned long val;
 962         ssize_t result = strict_strtoul(buf, 0, &val);
 963
 964         if (result < 0)
 965                 return result;
 966
 967         if (val != 1)
 968                 return -EINVAL;
 969
 970         result = pci_reset_function(pdev);
 971         if (result < 0)
 972                 return result;
 973
 974         return count;
 975 }
 976
 977 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
 978
 979 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
 980 {
 981         int retval;
 982         struct bin_attribute *attr;
 983
 984         /* If the device has VPD, try to expose it in sysfs. */
 985         if (dev->vpd) {
 986                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 987                 if (!attr)
 988                         return -ENOMEM;
 989
 990                 attr->size = dev->vpd->len;
 991                 attr->attr.name = "vpd";
 992                 attr->attr.mode = S_IRUSR | S_IWUSR;
 993                 attr->read = read_vpd_attr;
 994                 attr->write = write_vpd_attr;
 995                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
 996                 if (retval) {
 997                         kfree(attr);
 998                         return retval;
 999                 }
1000                 dev->vpd->attr = attr;
1001         }
1002
1003         /* Active State Power Management */
1004         pcie_aspm_create_sysfs_dev_files(dev);
1005
1006         if (!pci_probe_reset_function(dev)) {
1007                 retval = device_create_file(&dev->dev, &reset_attr);
1008                 if (retval)
1009                         goto error;
1010                 dev->reset_fn = 1;
1011         }
1012         return 0;
1013
1014 error:
1015         pcie_aspm_remove_sysfs_dev_files(dev);
1016         if (dev->vpd && dev->vpd->attr) {
1017                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1018                 kfree(dev->vpd->attr);
1019         }
1020
1021         return retval;
1022 }
1023
1024 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1025 {
1026         int retval;
1027         int rom_size = 0;
1028         struct bin_attribute *attr;
1029
1030         if (!sysfs_initialized)
1031                 return -EACCES;
1032
1033         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1034                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1035         else
1036                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1037         if (retval)
1038                 goto err;
1039
1040         retval = pci_create_resource_files(pdev);
1041         if (retval)
1042                 goto err_config_file;
1043
1044         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1045                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1046         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1047                 rom_size = 0x20000;
1048
1049         /* If the device has a ROM, try to expose it in sysfs. */
1050         if (rom_size) {
1051                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1052                 if (!attr) {
1053                         retval = -ENOMEM;
1054                         goto err_resource_files;
1055                 }
1056                 attr->size = rom_size;
1057                 attr->attr.name = "rom";
1058                 attr->attr.mode = S_IRUSR;
1059                 attr->read = pci_read_rom;
1060                 attr->write = pci_write_rom;
1061                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1062                 if (retval) {
1063                         kfree(attr);
1064                         goto err_resource_files;
1065                 }
1066                 pdev->rom_attr = attr;
1067         }
1068
1069         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1070                 retval = device_create_file(&pdev->dev, &vga_attr);
1071                 if (retval)
1072                         goto err_rom_file;
1073         }
1074
1075         /* add platform-specific attributes */
1076         retval = pcibios_add_platform_entries(pdev);
1077         if (retval)
1078                 goto err_vga_file;
1079
1080         /* add sysfs entries for various capabilities */
1081         retval = pci_create_capabilities_sysfs(pdev);
1082         if (retval)
1083                 goto err_vga_file;
1084
1085         return 0;
1086
1087 err_vga_file:
1088         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1089                 device_remove_file(&pdev->dev, &vga_attr);
1090 err_rom_file:
1091         if (rom_size) {
1092                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1093                 kfree(pdev->rom_attr);
1094                 pdev->rom_attr = NULL;
1095         }
1096 err_resource_files:
1097         pci_remove_resource_files(pdev);
1098 err_config_file:
1099         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1100                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1101         else
1102                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1103 err:
1104         return retval;
1105 }
1106
1107 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1108 {
1109         if (dev->vpd && dev->vpd->attr) {
1110                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1111                 kfree(dev->vpd->attr);
1112         }
1113
1114         pcie_aspm_remove_sysfs_dev_files(dev);
1115         if (dev->reset_fn) {
1116                 device_remove_file(&dev->dev, &reset_attr);
1117                 dev->reset_fn = 0;
1118         }
1119 }
1120
1121 /**
1122  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1123  * @pdev: device whose entries we should free
1124  *
1125  * Cleanup when @pdev is removed from sysfs.
1126  */
1127 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1128 {
1129         int rom_size = 0;
1130
1131         if (!sysfs_initialized)
1132                 return;
1133
1134         pci_remove_capabilities_sysfs(pdev);
1135
1136         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1137                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1138         else
1139                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1140
1141         pci_remove_resource_files(pdev);
1142
1143         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1144                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1145         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1146                 rom_size = 0x20000;
1147
1148         if (rom_size && pdev->rom_attr) {
1149                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1150                 kfree(pdev->rom_attr);
1151         }
1152 }
1153
1154 static int __init pci_sysfs_init(void)
1155 {
1156         struct pci_dev *pdev = NULL;
1157         int retval;
1158
1159         sysfs_initialized = 1;
1160         for_each_pci_dev(pdev) {
1161                 retval = pci_create_sysfs_dev_files(pdev);
1162                 if (retval) {
1163                         pci_dev_put(pdev);
1164                         return retval;
1165                 }
1166         }
1167
1168         return 0;
1169 }
1170
1171 late_initcall(pci_sysfs_init);