drivers/pci/pci-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * drivers/pci/pci-sysfs.c
   4  *
   5  * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
   6  * (C) Copyright 2002-2004 IBM Corp.
   7  * (C) Copyright 2003 Matthew Wilcox
   8  * (C) Copyright 2003 Hewlett-Packard
   9  * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
  10  * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
  11  *
  12  * File attributes for PCI devices
  13  *
  14  * Modeled after usb's driverfs.c
  15  *
  16  */
  17
  18
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/pci.h>
  22 #include <linux/stat.h>
  23 #include <linux/export.h>
  24 #include <linux/topology.h>
  25 #include <linux/mm.h>
  26 #include <linux/fs.h>
  27 #include <linux/capability.h>
  28 #include <linux/security.h>
  29 #include <linux/pci-aspm.h>
  30 #include <linux/slab.h>
  31 #include <linux/vgaarb.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/of.h>
  34 #include "pci.h"
  35
  36 static int sysfs_initialized;   /* = 0 */
  37
  38 /* show configuration fields */
  39 #define pci_config_attr(field, format_string)                           \
  40 static ssize_t                                                          \
  41 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  42 {                                                                       \
  43         struct pci_dev *pdev;                                           \
  44                                                                         \
  45         pdev = to_pci_dev(dev);                                         \
  46         return sprintf(buf, format_string, pdev->field);                \
  47 }                                                                       \
  48 static DEVICE_ATTR_RO(field)
  49
  50 pci_config_attr(vendor, "0x%04x\n");
  51 pci_config_attr(device, "0x%04x\n");
  52 pci_config_attr(subsystem_vendor, "0x%04x\n");
  53 pci_config_attr(subsystem_device, "0x%04x\n");
  54 pci_config_attr(revision, "0x%02x\n");
  55 pci_config_attr(class, "0x%06x\n");
  56 pci_config_attr(irq, "%u\n");
  57
  58 static ssize_t broken_parity_status_show(struct device *dev,
  59                                          struct device_attribute *attr,
  60                                          char *buf)
  61 {
  62         struct pci_dev *pdev = to_pci_dev(dev);
  63         return sprintf(buf, "%u\n", pdev->broken_parity_status);
  64 }
  65
  66 static ssize_t broken_parity_status_store(struct device *dev,
  67                                           struct device_attribute *attr,
  68                                           const char *buf, size_t count)
  69 {
  70         struct pci_dev *pdev = to_pci_dev(dev);
  71         unsigned long val;
  72
  73         if (kstrtoul(buf, 0, &val) < 0)
  74                 return -EINVAL;
  75
  76         pdev->broken_parity_status = !!val;
  77
  78         return count;
  79 }
  80 static DEVICE_ATTR_RW(broken_parity_status);
  81
  82 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
  83                                       struct device_attribute *attr, char *buf)
  84 {
  85         const struct cpumask *mask;
  86
  87 #ifdef CONFIG_NUMA
  88         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  89                                           cpumask_of_node(dev_to_node(dev));
  90 #else
  91         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  92 #endif
  93         return cpumap_print_to_pagebuf(list, buf, mask);
  94 }
  95
  96 static ssize_t local_cpus_show(struct device *dev,
  97                                struct device_attribute *attr, char *buf)
  98 {
  99         return pci_dev_show_local_cpu(dev, false, attr, buf);
 100 }
 101 static DEVICE_ATTR_RO(local_cpus);
 102
 103 static ssize_t local_cpulist_show(struct device *dev,
 104                                   struct device_attribute *attr, char *buf)
 105 {
 106         return pci_dev_show_local_cpu(dev, true, attr, buf);
 107 }
 108 static DEVICE_ATTR_RO(local_cpulist);
 109
 110 /*
 111  * PCI Bus Class Devices
 112  */
 113 static ssize_t cpuaffinity_show(struct device *dev,
 114                                 struct device_attribute *attr, char *buf)
 115 {
 116         const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 117
 118         return cpumap_print_to_pagebuf(false, buf, cpumask);
 119 }
 120 static DEVICE_ATTR_RO(cpuaffinity);
 121
 122 static ssize_t cpulistaffinity_show(struct device *dev,
 123                                     struct device_attribute *attr, char *buf)
 124 {
 125         const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 126
 127         return cpumap_print_to_pagebuf(true, buf, cpumask);
 128 }
 129 static DEVICE_ATTR_RO(cpulistaffinity);
 130
 131 /* show resources */
 132 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
 133                              char *buf)
 134 {
 135         struct pci_dev *pci_dev = to_pci_dev(dev);
 136         char *str = buf;
 137         int i;
 138         int max;
 139         resource_size_t start, end;
 140
 141         if (pci_dev->subordinate)
 142                 max = DEVICE_COUNT_RESOURCE;
 143         else
 144                 max = PCI_BRIDGE_RESOURCES;
 145
 146         for (i = 0; i < max; i++) {
 147                 struct resource *res =  &pci_dev->resource[i];
 148                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 149                 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
 150                                (unsigned long long)start,
 151                                (unsigned long long)end,
 152                                (unsigned long long)res->flags);
 153         }
 154         return (str - buf);
 155 }
 156 static DEVICE_ATTR_RO(resource);
 157
 158 static ssize_t max_link_speed_show(struct device *dev,
 159                                    struct device_attribute *attr, char *buf)
 160 {
 161         struct pci_dev *pci_dev = to_pci_dev(dev);
 162         u32 linkcap;
 163         int err;
 164         const char *speed;
 165
 166         err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
 167         if (err)
 168                 return -EINVAL;
 169
 170         switch (linkcap & PCI_EXP_LNKCAP_SLS) {
 171         case PCI_EXP_LNKCAP_SLS_8_0GB:
 172                 speed = "8 GT/s";
 173                 break;
 174         case PCI_EXP_LNKCAP_SLS_5_0GB:
 175                 speed = "5 GT/s";
 176                 break;
 177         case PCI_EXP_LNKCAP_SLS_2_5GB:
 178                 speed = "2.5 GT/s";
 179                 break;
 180         default:
 181                 speed = "Unknown speed";
 182         }
 183
 184         return sprintf(buf, "%s\n", speed);
 185 }
 186 static DEVICE_ATTR_RO(max_link_speed);
 187
 188 static ssize_t max_link_width_show(struct device *dev,
 189                                    struct device_attribute *attr, char *buf)
 190 {
 191         struct pci_dev *pci_dev = to_pci_dev(dev);
 192         u32 linkcap;
 193         int err;
 194
 195         err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
 196         if (err)
 197                 return -EINVAL;
 198
 199         return sprintf(buf, "%u\n", (linkcap & PCI_EXP_LNKCAP_MLW) >> 4);
 200 }
 201 static DEVICE_ATTR_RO(max_link_width);
 202
 203 static ssize_t current_link_speed_show(struct device *dev,
 204                                        struct device_attribute *attr, char *buf)
 205 {
 206         struct pci_dev *pci_dev = to_pci_dev(dev);
 207         u16 linkstat;
 208         int err;
 209         const char *speed;
 210
 211         err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
 212         if (err)
 213                 return -EINVAL;
 214
 215         switch (linkstat & PCI_EXP_LNKSTA_CLS) {
 216         case PCI_EXP_LNKSTA_CLS_8_0GB:
 217                 speed = "8 GT/s";
 218                 break;
 219         case PCI_EXP_LNKSTA_CLS_5_0GB:
 220                 speed = "5 GT/s";
 221                 break;
 222         case PCI_EXP_LNKSTA_CLS_2_5GB:
 223                 speed = "2.5 GT/s";
 224                 break;
 225         default:
 226                 speed = "Unknown speed";
 227         }
 228
 229         return sprintf(buf, "%s\n", speed);
 230 }
 231 static DEVICE_ATTR_RO(current_link_speed);
 232
 233 static ssize_t current_link_width_show(struct device *dev,
 234                                        struct device_attribute *attr, char *buf)
 235 {
 236         struct pci_dev *pci_dev = to_pci_dev(dev);
 237         u16 linkstat;
 238         int err;
 239
 240         err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
 241         if (err)
 242                 return -EINVAL;
 243
 244         return sprintf(buf, "%u\n",
 245                 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
 246 }
 247 static DEVICE_ATTR_RO(current_link_width);
 248
 249 static ssize_t secondary_bus_number_show(struct device *dev,
 250                                          struct device_attribute *attr,
 251                                          char *buf)
 252 {
 253         struct pci_dev *pci_dev = to_pci_dev(dev);
 254         u8 sec_bus;
 255         int err;
 256
 257         err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
 258         if (err)
 259                 return -EINVAL;
 260
 261         return sprintf(buf, "%u\n", sec_bus);
 262 }
 263 static DEVICE_ATTR_RO(secondary_bus_number);
 264
 265 static ssize_t subordinate_bus_number_show(struct device *dev,
 266                                            struct device_attribute *attr,
 267                                            char *buf)
 268 {
 269         struct pci_dev *pci_dev = to_pci_dev(dev);
 270         u8 sub_bus;
 271         int err;
 272
 273         err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
 274         if (err)
 275                 return -EINVAL;
 276
 277         return sprintf(buf, "%u\n", sub_bus);
 278 }
 279 static DEVICE_ATTR_RO(subordinate_bus_number);
 280
 281 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 282                              char *buf)
 283 {
 284         struct pci_dev *pci_dev = to_pci_dev(dev);
 285
 286         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
 287                        pci_dev->vendor, pci_dev->device,
 288                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 289                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 290                        (u8)(pci_dev->class));
 291 }
 292 static DEVICE_ATTR_RO(modalias);
 293
 294 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
 295                              const char *buf, size_t count)
 296 {
 297         struct pci_dev *pdev = to_pci_dev(dev);
 298         unsigned long val;
 299         ssize_t result = kstrtoul(buf, 0, &val);
 300
 301         if (result < 0)
 302                 return result;
 303
 304         /* this can crash the machine when done on the "wrong" device */
 305         if (!capable(CAP_SYS_ADMIN))
 306                 return -EPERM;
 307
 308         if (!val) {
 309                 if (pci_is_enabled(pdev))
 310                         pci_disable_device(pdev);
 311                 else
 312                         result = -EIO;
 313         } else
 314                 result = pci_enable_device(pdev);
 315
 316         return result < 0 ? result : count;
 317 }
 318
 319 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
 320                             char *buf)
 321 {
 322         struct pci_dev *pdev;
 323
 324         pdev = to_pci_dev(dev);
 325         return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
 326 }
 327 static DEVICE_ATTR_RW(enable);
 328
 329 #ifdef CONFIG_NUMA
 330 static ssize_t numa_node_store(struct device *dev,
 331                                struct device_attribute *attr, const char *buf,
 332                                size_t count)
 333 {
 334         struct pci_dev *pdev = to_pci_dev(dev);
 335         int node, ret;
 336
 337         if (!capable(CAP_SYS_ADMIN))
 338                 return -EPERM;
 339
 340         ret = kstrtoint(buf, 0, &node);
 341         if (ret)
 342                 return ret;
 343
 344         if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
 345                 return -EINVAL;
 346
 347         if (node != NUMA_NO_NODE && !node_online(node))
 348                 return -EINVAL;
 349
 350         add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
 351         dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d.  Contact your vendor for updates.",
 352                   node);
 353
 354         dev->numa_node = node;
 355         return count;
 356 }
 357
 358 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
 359                               char *buf)
 360 {
 361         return sprintf(buf, "%d\n", dev->numa_node);
 362 }
 363 static DEVICE_ATTR_RW(numa_node);
 364 #endif
 365
 366 static ssize_t dma_mask_bits_show(struct device *dev,
 367                                   struct device_attribute *attr, char *buf)
 368 {
 369         struct pci_dev *pdev = to_pci_dev(dev);
 370
 371         return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
 372 }
 373 static DEVICE_ATTR_RO(dma_mask_bits);
 374
 375 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
 376                                              struct device_attribute *attr,
 377                                              char *buf)
 378 {
 379         return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
 380 }
 381 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
 382
 383 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
 384                             char *buf)
 385 {
 386         struct pci_dev *pdev = to_pci_dev(dev);
 387         struct pci_bus *subordinate = pdev->subordinate;
 388
 389         return sprintf(buf, "%u\n", subordinate ?
 390                        !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
 391                            : !pdev->no_msi);
 392 }
 393
 394 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
 395                              const char *buf, size_t count)
 396 {
 397         struct pci_dev *pdev = to_pci_dev(dev);
 398         struct pci_bus *subordinate = pdev->subordinate;
 399         unsigned long val;
 400
 401         if (kstrtoul(buf, 0, &val) < 0)
 402                 return -EINVAL;
 403
 404         if (!capable(CAP_SYS_ADMIN))
 405                 return -EPERM;
 406
 407         /*
 408          * "no_msi" and "bus_flags" only affect what happens when a driver
 409          * requests MSI or MSI-X.  They don't affect any drivers that have
 410          * already requested MSI or MSI-X.
 411          */
 412         if (!subordinate) {
 413                 pdev->no_msi = !val;
 414                 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
 415                          val ? "allowed" : "disallowed");
 416                 return count;
 417         }
 418
 419         if (val)
 420                 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
 421         else
 422                 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 423
 424         dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
 425                  val ? "allowed" : "disallowed");
 426         return count;
 427 }
 428 static DEVICE_ATTR_RW(msi_bus);
 429
 430 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 431                                 size_t count)
 432 {
 433         unsigned long val;
 434         struct pci_bus *b = NULL;
 435
 436         if (kstrtoul(buf, 0, &val) < 0)
 437                 return -EINVAL;
 438
 439         if (val) {
 440                 pci_lock_rescan_remove();
 441                 while ((b = pci_find_next_bus(b)) != NULL)
 442                         pci_rescan_bus(b);
 443                 pci_unlock_rescan_remove();
 444         }
 445         return count;
 446 }
 447 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
 448
 449 static struct attribute *pci_bus_attrs[] = {
 450         &bus_attr_rescan.attr,
 451         NULL,
 452 };
 453
 454 static const struct attribute_group pci_bus_group = {
 455         .attrs = pci_bus_attrs,
 456 };
 457
 458 const struct attribute_group *pci_bus_groups[] = {
 459         &pci_bus_group,
 460         NULL,
 461 };
 462
 463 static ssize_t dev_rescan_store(struct device *dev,
 464                                 struct device_attribute *attr, const char *buf,
 465                                 size_t count)
 466 {
 467         unsigned long val;
 468         struct pci_dev *pdev = to_pci_dev(dev);
 469
 470         if (kstrtoul(buf, 0, &val) < 0)
 471                 return -EINVAL;
 472
 473         if (val) {
 474                 pci_lock_rescan_remove();
 475                 pci_rescan_bus(pdev->bus);
 476                 pci_unlock_rescan_remove();
 477         }
 478         return count;
 479 }
 480 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
 481                                                         (S_IWUSR|S_IWGRP),
 482                                                         NULL, dev_rescan_store);
 483
 484 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
 485                             const char *buf, size_t count)
 486 {
 487         unsigned long val;
 488
 489         if (kstrtoul(buf, 0, &val) < 0)
 490                 return -EINVAL;
 491
 492         if (val && device_remove_file_self(dev, attr))
 493                 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
 494         return count;
 495 }
 496 static struct device_attribute dev_remove_attr = __ATTR(remove,
 497                                                         (S_IWUSR|S_IWGRP),
 498                                                         NULL, remove_store);
 499
 500 static ssize_t dev_bus_rescan_store(struct device *dev,
 501                                     struct device_attribute *attr,
 502                                     const char *buf, size_t count)
 503 {
 504         unsigned long val;
 505         struct pci_bus *bus = to_pci_bus(dev);
 506
 507         if (kstrtoul(buf, 0, &val) < 0)
 508                 return -EINVAL;
 509
 510         if (val) {
 511                 pci_lock_rescan_remove();
 512                 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
 513                         pci_rescan_bus_bridge_resize(bus->self);
 514                 else
 515                         pci_rescan_bus(bus);
 516                 pci_unlock_rescan_remove();
 517         }
 518         return count;
 519 }
 520 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
 521
 522 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
 523 static ssize_t d3cold_allowed_store(struct device *dev,
 524                                     struct device_attribute *attr,
 525                                     const char *buf, size_t count)
 526 {
 527         struct pci_dev *pdev = to_pci_dev(dev);
 528         unsigned long val;
 529
 530         if (kstrtoul(buf, 0, &val) < 0)
 531                 return -EINVAL;
 532
 533         pdev->d3cold_allowed = !!val;
 534         if (pdev->d3cold_allowed)
 535                 pci_d3cold_enable(pdev);
 536         else
 537                 pci_d3cold_disable(pdev);
 538
 539         pm_runtime_resume(dev);
 540
 541         return count;
 542 }
 543
 544 static ssize_t d3cold_allowed_show(struct device *dev,
 545                                    struct device_attribute *attr, char *buf)
 546 {
 547         struct pci_dev *pdev = to_pci_dev(dev);
 548         return sprintf(buf, "%u\n", pdev->d3cold_allowed);
 549 }
 550 static DEVICE_ATTR_RW(d3cold_allowed);
 551 #endif
 552
 553 #ifdef CONFIG_OF
 554 static ssize_t devspec_show(struct device *dev,
 555                             struct device_attribute *attr, char *buf)
 556 {
 557         struct pci_dev *pdev = to_pci_dev(dev);
 558         struct device_node *np = pci_device_to_OF_node(pdev);
 559
 560         if (np == NULL)
 561                 return 0;
 562         return sprintf(buf, "%pOF", np);
 563 }
 564 static DEVICE_ATTR_RO(devspec);
 565 #endif
 566
 567 #ifdef CONFIG_PCI_IOV
 568 static ssize_t sriov_totalvfs_show(struct device *dev,
 569                                    struct device_attribute *attr,
 570                                    char *buf)
 571 {
 572         struct pci_dev *pdev = to_pci_dev(dev);
 573
 574         return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
 575 }
 576
 577
 578 static ssize_t sriov_numvfs_show(struct device *dev,
 579                                  struct device_attribute *attr,
 580                                  char *buf)
 581 {
 582         struct pci_dev *pdev = to_pci_dev(dev);
 583
 584         return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
 585 }
 586
 587 /*
 588  * num_vfs > 0; number of VFs to enable
 589  * num_vfs = 0; disable all VFs
 590  *
 591  * Note: SRIOV spec doesn't allow partial VF
 592  *       disable, so it's all or none.
 593  */
 594 static ssize_t sriov_numvfs_store(struct device *dev,
 595                                   struct device_attribute *attr,
 596                                   const char *buf, size_t count)
 597 {
 598         struct pci_dev *pdev = to_pci_dev(dev);
 599         int ret;
 600         u16 num_vfs;
 601
 602         ret = kstrtou16(buf, 0, &num_vfs);
 603         if (ret < 0)
 604                 return ret;
 605
 606         if (num_vfs > pci_sriov_get_totalvfs(pdev))
 607                 return -ERANGE;
 608
 609         device_lock(&pdev->dev);
 610
 611         if (num_vfs == pdev->sriov->num_VFs)
 612                 goto exit;
 613
 614         /* is PF driver loaded w/callback */
 615         if (!pdev->driver || !pdev->driver->sriov_configure) {
 616                 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
 617                 ret = -ENOENT;
 618                 goto exit;
 619         }
 620
 621         if (num_vfs == 0) {
 622                 /* disable VFs */
 623                 ret = pdev->driver->sriov_configure(pdev, 0);
 624                 goto exit;
 625         }
 626
 627         /* enable VFs */
 628         if (pdev->sriov->num_VFs) {
 629                 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
 630                          pdev->sriov->num_VFs, num_vfs);
 631                 ret = -EBUSY;
 632                 goto exit;
 633         }
 634
 635         ret = pdev->driver->sriov_configure(pdev, num_vfs);
 636         if (ret < 0)
 637                 goto exit;
 638
 639         if (ret != num_vfs)
 640                 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
 641                          num_vfs, ret);
 642
 643 exit:
 644         device_unlock(&pdev->dev);
 645
 646         if (ret < 0)
 647                 return ret;
 648
 649         return count;
 650 }
 651
 652 static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
 653                                             struct device_attribute *attr,
 654                                             char *buf)
 655 {
 656         struct pci_dev *pdev = to_pci_dev(dev);
 657
 658         return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
 659 }
 660
 661 static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
 662                                              struct device_attribute *attr,
 663                                              const char *buf, size_t count)
 664 {
 665         struct pci_dev *pdev = to_pci_dev(dev);
 666         bool drivers_autoprobe;
 667
 668         if (kstrtobool(buf, &drivers_autoprobe) < 0)
 669                 return -EINVAL;
 670
 671         pdev->sriov->drivers_autoprobe = drivers_autoprobe;
 672
 673         return count;
 674 }
 675
 676 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
 677 static struct device_attribute sriov_numvfs_attr =
 678                 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
 679                        sriov_numvfs_show, sriov_numvfs_store);
 680 static struct device_attribute sriov_drivers_autoprobe_attr =
 681                 __ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
 682                        sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
 683 #endif /* CONFIG_PCI_IOV */
 684
 685 static ssize_t driver_override_store(struct device *dev,
 686                                      struct device_attribute *attr,
 687                                      const char *buf, size_t count)
 688 {
 689         struct pci_dev *pdev = to_pci_dev(dev);
 690         char *driver_override, *old, *cp;
 691
 692         /* We need to keep extra room for a newline */
 693         if (count >= (PAGE_SIZE - 1))
 694                 return -EINVAL;
 695
 696         driver_override = kstrndup(buf, count, GFP_KERNEL);
 697         if (!driver_override)
 698                 return -ENOMEM;
 699
 700         cp = strchr(driver_override, '\n');
 701         if (cp)
 702                 *cp = '\0';
 703
 704         device_lock(dev);
 705         old = pdev->driver_override;
 706         if (strlen(driver_override)) {
 707                 pdev->driver_override = driver_override;
 708         } else {
 709                 kfree(driver_override);
 710                 pdev->driver_override = NULL;
 711         }
 712         device_unlock(dev);
 713
 714         kfree(old);
 715
 716         return count;
 717 }
 718
 719 static ssize_t driver_override_show(struct device *dev,
 720                                     struct device_attribute *attr, char *buf)
 721 {
 722         struct pci_dev *pdev = to_pci_dev(dev);
 723         ssize_t len;
 724
 725         device_lock(dev);
 726         len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
 727         device_unlock(dev);
 728         return len;
 729 }
 730 static DEVICE_ATTR_RW(driver_override);
 731
 732 static struct attribute *pci_dev_attrs[] = {
 733         &dev_attr_resource.attr,
 734         &dev_attr_vendor.attr,
 735         &dev_attr_device.attr,
 736         &dev_attr_subsystem_vendor.attr,
 737         &dev_attr_subsystem_device.attr,
 738         &dev_attr_revision.attr,
 739         &dev_attr_class.attr,
 740         &dev_attr_irq.attr,
 741         &dev_attr_local_cpus.attr,
 742         &dev_attr_local_cpulist.attr,
 743         &dev_attr_modalias.attr,
 744 #ifdef CONFIG_NUMA
 745         &dev_attr_numa_node.attr,
 746 #endif
 747         &dev_attr_dma_mask_bits.attr,
 748         &dev_attr_consistent_dma_mask_bits.attr,
 749         &dev_attr_enable.attr,
 750         &dev_attr_broken_parity_status.attr,
 751         &dev_attr_msi_bus.attr,
 752 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
 753         &dev_attr_d3cold_allowed.attr,
 754 #endif
 755 #ifdef CONFIG_OF
 756         &dev_attr_devspec.attr,
 757 #endif
 758         &dev_attr_driver_override.attr,
 759         NULL,
 760 };
 761
 762 static struct attribute *pci_bridge_attrs[] = {
 763         &dev_attr_subordinate_bus_number.attr,
 764         &dev_attr_secondary_bus_number.attr,
 765         NULL,
 766 };
 767
 768 static struct attribute *pcie_dev_attrs[] = {
 769         &dev_attr_current_link_speed.attr,
 770         &dev_attr_current_link_width.attr,
 771         &dev_attr_max_link_width.attr,
 772         &dev_attr_max_link_speed.attr,
 773         NULL,
 774 };
 775
 776 static struct attribute *pcibus_attrs[] = {
 777         &dev_attr_rescan.attr,
 778         &dev_attr_cpuaffinity.attr,
 779         &dev_attr_cpulistaffinity.attr,
 780         NULL,
 781 };
 782
 783 static const struct attribute_group pcibus_group = {
 784         .attrs = pcibus_attrs,
 785 };
 786
 787 const struct attribute_group *pcibus_groups[] = {
 788         &pcibus_group,
 789         NULL,
 790 };
 791
 792 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
 793                              char *buf)
 794 {
 795         struct pci_dev *pdev = to_pci_dev(dev);
 796         struct pci_dev *vga_dev = vga_default_device();
 797
 798         if (vga_dev)
 799                 return sprintf(buf, "%u\n", (pdev == vga_dev));
 800
 801         return sprintf(buf, "%u\n",
 802                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 803                    IORESOURCE_ROM_SHADOW));
 804 }
 805 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 806
 807 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
 808                                struct bin_attribute *bin_attr, char *buf,
 809                                loff_t off, size_t count)
 810 {
 811         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 812         unsigned int size = 64;
 813         loff_t init_off = off;
 814         u8 *data = (u8 *) buf;
 815
 816         /* Several chips lock up trying to read undefined config space */
 817         if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
 818                 size = dev->cfg_size;
 819         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 820                 size = 128;
 821
 822         if (off > size)
 823                 return 0;
 824         if (off + count > size) {
 825                 size -= off;
 826                 count = size;
 827         } else {
 828                 size = count;
 829         }
 830
 831         pci_config_pm_runtime_get(dev);
 832
 833         if ((off & 1) && size) {
 834                 u8 val;
 835                 pci_user_read_config_byte(dev, off, &val);
 836                 data[off - init_off] = val;
 837                 off++;
 838                 size--;
 839         }
 840
 841         if ((off & 3) && size > 2) {
 842                 u16 val;
 843                 pci_user_read_config_word(dev, off, &val);
 844                 data[off - init_off] = val & 0xff;
 845                 data[off - init_off + 1] = (val >> 8) & 0xff;
 846                 off += 2;
 847                 size -= 2;
 848         }
 849
 850         while (size > 3) {
 851                 u32 val;
 852                 pci_user_read_config_dword(dev, off, &val);
 853                 data[off - init_off] = val & 0xff;
 854                 data[off - init_off + 1] = (val >> 8) & 0xff;
 855                 data[off - init_off + 2] = (val >> 16) & 0xff;
 856                 data[off - init_off + 3] = (val >> 24) & 0xff;
 857                 off += 4;
 858                 size -= 4;
 859         }
 860
 861         if (size >= 2) {
 862                 u16 val;
 863                 pci_user_read_config_word(dev, off, &val);
 864                 data[off - init_off] = val & 0xff;
 865                 data[off - init_off + 1] = (val >> 8) & 0xff;
 866                 off += 2;
 867                 size -= 2;
 868         }
 869
 870         if (size > 0) {
 871                 u8 val;
 872                 pci_user_read_config_byte(dev, off, &val);
 873                 data[off - init_off] = val;
 874                 off++;
 875                 --size;
 876         }
 877
 878         pci_config_pm_runtime_put(dev);
 879
 880         return count;
 881 }
 882
 883 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
 884                                 struct bin_attribute *bin_attr, char *buf,
 885                                 loff_t off, size_t count)
 886 {
 887         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 888         unsigned int size = count;
 889         loff_t init_off = off;
 890         u8 *data = (u8 *) buf;
 891
 892         if (off > dev->cfg_size)
 893                 return 0;
 894         if (off + count > dev->cfg_size) {
 895                 size = dev->cfg_size - off;
 896                 count = size;
 897         }
 898
 899         pci_config_pm_runtime_get(dev);
 900
 901         if ((off & 1) && size) {
 902                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 903                 off++;
 904                 size--;
 905         }
 906
 907         if ((off & 3) && size > 2) {
 908                 u16 val = data[off - init_off];
 909                 val |= (u16) data[off - init_off + 1] << 8;
 910                 pci_user_write_config_word(dev, off, val);
 911                 off += 2;
 912                 size -= 2;
 913         }
 914
 915         while (size > 3) {
 916                 u32 val = data[off - init_off];
 917                 val |= (u32) data[off - init_off + 1] << 8;
 918                 val |= (u32) data[off - init_off + 2] << 16;
 919                 val |= (u32) data[off - init_off + 3] << 24;
 920                 pci_user_write_config_dword(dev, off, val);
 921                 off += 4;
 922                 size -= 4;
 923         }
 924
 925         if (size >= 2) {
 926                 u16 val = data[off - init_off];
 927                 val |= (u16) data[off - init_off + 1] << 8;
 928                 pci_user_write_config_word(dev, off, val);
 929                 off += 2;
 930                 size -= 2;
 931         }
 932
 933         if (size) {
 934                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 935                 off++;
 936                 --size;
 937         }
 938
 939         pci_config_pm_runtime_put(dev);
 940
 941         return count;
 942 }
 943
 944 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
 945                              struct bin_attribute *bin_attr, char *buf,
 946                              loff_t off, size_t count)
 947 {
 948         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 949
 950         if (bin_attr->size > 0) {
 951                 if (off > bin_attr->size)
 952                         count = 0;
 953                 else if (count > bin_attr->size - off)
 954                         count = bin_attr->size - off;
 955         }
 956
 957         return pci_read_vpd(dev, off, count, buf);
 958 }
 959
 960 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
 961                               struct bin_attribute *bin_attr, char *buf,
 962                               loff_t off, size_t count)
 963 {
 964         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 965
 966         if (bin_attr->size > 0) {
 967                 if (off > bin_attr->size)
 968                         count = 0;
 969                 else if (count > bin_attr->size - off)
 970                         count = bin_attr->size - off;
 971         }
 972
 973         return pci_write_vpd(dev, off, count, buf);
 974 }
 975
 976 #ifdef HAVE_PCI_LEGACY
 977 /**
 978  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 979  * @filp: open sysfs file
 980  * @kobj: kobject corresponding to file to read from
 981  * @bin_attr: struct bin_attribute for this file
 982  * @buf: buffer to store results
 983  * @off: offset into legacy I/O port space
 984  * @count: number of bytes to read
 985  *
 986  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 987  * callback routine (pci_legacy_read).
 988  */
 989 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 990                                   struct bin_attribute *bin_attr, char *buf,
 991                                   loff_t off, size_t count)
 992 {
 993         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
 994
 995         /* Only support 1, 2 or 4 byte accesses */
 996         if (count != 1 && count != 2 && count != 4)
 997                 return -EINVAL;
 998
 999         return pci_legacy_read(bus, off, (u32 *)buf, count);
1000 }
1001
1002 /**
1003  * pci_write_legacy_io - write byte(s) to legacy I/O port space
1004  * @filp: open sysfs file
1005  * @kobj: kobject corresponding to file to read from
1006  * @bin_attr: struct bin_attribute for this file
1007  * @buf: buffer containing value to be written
1008  * @off: offset into legacy I/O port space
1009  * @count: number of bytes to write
1010  *
1011  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
1012  * callback routine (pci_legacy_write).
1013  */
1014 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
1015                                    struct bin_attribute *bin_attr, char *buf,
1016                                    loff_t off, size_t count)
1017 {
1018         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1019
1020         /* Only support 1, 2 or 4 byte accesses */
1021         if (count != 1 && count != 2 && count != 4)
1022                 return -EINVAL;
1023
1024         return pci_legacy_write(bus, off, *(u32 *)buf, count);
1025 }
1026
1027 /**
1028  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
1029  * @filp: open sysfs file
1030  * @kobj: kobject corresponding to device to be mapped
1031  * @attr: struct bin_attribute for this file
1032  * @vma: struct vm_area_struct passed to mmap
1033  *
1034  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
1035  * legacy memory space (first meg of bus space) into application virtual
1036  * memory space.
1037  */
1038 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
1039                                struct bin_attribute *attr,
1040                                struct vm_area_struct *vma)
1041 {
1042         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1043
1044         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
1045 }
1046
1047 /**
1048  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
1049  * @filp: open sysfs file
1050  * @kobj: kobject corresponding to device to be mapped
1051  * @attr: struct bin_attribute for this file
1052  * @vma: struct vm_area_struct passed to mmap
1053  *
1054  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
1055  * legacy IO space (first meg of bus space) into application virtual
1056  * memory space. Returns -ENOSYS if the operation isn't supported
1057  */
1058 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
1059                               struct bin_attribute *attr,
1060                               struct vm_area_struct *vma)
1061 {
1062         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1063
1064         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
1065 }
1066
1067 /**
1068  * pci_adjust_legacy_attr - adjustment of legacy file attributes
1069  * @b: bus to create files under
1070  * @mmap_type: I/O port or memory
1071  *
1072  * Stub implementation. Can be overridden by arch if necessary.
1073  */
1074 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
1075                                    enum pci_mmap_state mmap_type)
1076 {
1077 }
1078
1079 /**
1080  * pci_create_legacy_files - create legacy I/O port and memory files
1081  * @b: bus to create files under
1082  *
1083  * Some platforms allow access to legacy I/O port and ISA memory space on
1084  * a per-bus basis.  This routine creates the files and ties them into
1085  * their associated read, write and mmap files from pci-sysfs.c
1086  *
1087  * On error unwind, but don't propagate the error to the caller
1088  * as it is ok to set up the PCI bus without these files.
1089  */
1090 void pci_create_legacy_files(struct pci_bus *b)
1091 {
1092         int error;
1093
1094         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
1095                                GFP_ATOMIC);
1096         if (!b->legacy_io)
1097                 goto kzalloc_err;
1098
1099         sysfs_bin_attr_init(b->legacy_io);
1100         b->legacy_io->attr.name = "legacy_io";
1101         b->legacy_io->size = 0xffff;
1102         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
1103         b->legacy_io->read = pci_read_legacy_io;
1104         b->legacy_io->write = pci_write_legacy_io;
1105         b->legacy_io->mmap = pci_mmap_legacy_io;
1106         pci_adjust_legacy_attr(b, pci_mmap_io);
1107         error = device_create_bin_file(&b->dev, b->legacy_io);
1108         if (error)
1109                 goto legacy_io_err;
1110
1111         /* Allocated above after the legacy_io struct */
1112         b->legacy_mem = b->legacy_io + 1;
1113         sysfs_bin_attr_init(b->legacy_mem);
1114         b->legacy_mem->attr.name = "legacy_mem";
1115         b->legacy_mem->size = 1024*1024;
1116         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
1117         b->legacy_mem->mmap = pci_mmap_legacy_mem;
1118         pci_adjust_legacy_attr(b, pci_mmap_mem);
1119         error = device_create_bin_file(&b->dev, b->legacy_mem);
1120         if (error)
1121                 goto legacy_mem_err;
1122
1123         return;
1124
1125 legacy_mem_err:
1126         device_remove_bin_file(&b->dev, b->legacy_io);
1127 legacy_io_err:
1128         kfree(b->legacy_io);
1129         b->legacy_io = NULL;
1130 kzalloc_err:
1131         printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
1132         return;
1133 }
1134
1135 void pci_remove_legacy_files(struct pci_bus *b)
1136 {
1137         if (b->legacy_io) {
1138                 device_remove_bin_file(&b->dev, b->legacy_io);
1139                 device_remove_bin_file(&b->dev, b->legacy_mem);
1140                 kfree(b->legacy_io); /* both are allocated here */
1141         }
1142 }
1143 #endif /* HAVE_PCI_LEGACY */
1144
1145 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1146
1147 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1148                   enum pci_mmap_api mmap_api)
1149 {
1150         unsigned long nr, start, size;
1151         resource_size_t pci_start = 0, pci_end;
1152
1153         if (pci_resource_len(pdev, resno) == 0)
1154                 return 0;
1155         nr = vma_pages(vma);
1156         start = vma->vm_pgoff;
1157         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1158         if (mmap_api == PCI_MMAP_PROCFS) {
1159                 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1160                                      &pci_start, &pci_end);
1161                 pci_start >>= PAGE_SHIFT;
1162         }
1163         if (start >= pci_start && start < pci_start + size &&
1164                         start + nr <= pci_start + size)
1165                 return 1;
1166         return 0;
1167 }
1168
1169 /**
1170  * pci_mmap_resource - map a PCI resource into user memory space
1171  * @kobj: kobject for mapping
1172  * @attr: struct bin_attribute for the file being mapped
1173  * @vma: struct vm_area_struct passed into the mmap
1174  * @write_combine: 1 for write_combine mapping
1175  *
1176  * Use the regular PCI mapping routines to map a PCI resource into userspace.
1177  */
1178 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1179                              struct vm_area_struct *vma, int write_combine)
1180 {
1181         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1182         int bar = (unsigned long)attr->private;
1183         enum pci_mmap_state mmap_type;
1184         struct resource *res = &pdev->resource[bar];
1185
1186         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1187                 return -EINVAL;
1188
1189         if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS)) {
1190                 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1191                         current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1192                         pci_name(pdev), bar,
1193                         (u64)pci_resource_start(pdev, bar),
1194                         (u64)pci_resource_len(pdev, bar));
1195                 return -EINVAL;
1196         }
1197         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1198
1199         return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1200 }
1201
1202 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1203                                 struct bin_attribute *attr,
1204                                 struct vm_area_struct *vma)
1205 {
1206         return pci_mmap_resource(kobj, attr, vma, 0);
1207 }
1208
1209 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1210                                 struct bin_attribute *attr,
1211                                 struct vm_area_struct *vma)
1212 {
1213         return pci_mmap_resource(kobj, attr, vma, 1);
1214 }
1215
1216 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1217                                struct bin_attribute *attr, char *buf,
1218                                loff_t off, size_t count, bool write)
1219 {
1220         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1221         int bar = (unsigned long)attr->private;
1222         unsigned long port = off;
1223
1224         port += pci_resource_start(pdev, bar);
1225
1226         if (port > pci_resource_end(pdev, bar))
1227                 return 0;
1228
1229         if (port + count - 1 > pci_resource_end(pdev, bar))
1230                 return -EINVAL;
1231
1232         switch (count) {
1233         case 1:
1234                 if (write)
1235                         outb(*(u8 *)buf, port);
1236                 else
1237                         *(u8 *)buf = inb(port);
1238                 return 1;
1239         case 2:
1240                 if (write)
1241                         outw(*(u16 *)buf, port);
1242                 else
1243                         *(u16 *)buf = inw(port);
1244                 return 2;
1245         case 4:
1246                 if (write)
1247                         outl(*(u32 *)buf, port);
1248                 else
1249                         *(u32 *)buf = inl(port);
1250                 return 4;
1251         }
1252         return -EINVAL;
1253 }
1254
1255 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1256                                     struct bin_attribute *attr, char *buf,
1257                                     loff_t off, size_t count)
1258 {
1259         return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1260 }
1261
1262 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1263                                      struct bin_attribute *attr, char *buf,
1264                                      loff_t off, size_t count)
1265 {
1266         return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1267 }
1268
1269 /**
1270  * pci_remove_resource_files - cleanup resource files
1271  * @pdev: dev to cleanup
1272  *
1273  * If we created resource files for @pdev, remove them from sysfs and
1274  * free their resources.
1275  */
1276 static void pci_remove_resource_files(struct pci_dev *pdev)
1277 {
1278         int i;
1279
1280         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1281                 struct bin_attribute *res_attr;
1282
1283                 res_attr = pdev->res_attr[i];
1284                 if (res_attr) {
1285                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1286                         kfree(res_attr);
1287                 }
1288
1289                 res_attr = pdev->res_attr_wc[i];
1290                 if (res_attr) {
1291                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1292                         kfree(res_attr);
1293                 }
1294         }
1295 }
1296
1297 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1298 {
1299         /* allocate attribute structure, piggyback attribute name */
1300         int name_len = write_combine ? 13 : 10;
1301         struct bin_attribute *res_attr;
1302         char *res_attr_name;
1303         int retval;
1304
1305         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1306         if (!res_attr)
1307                 return -ENOMEM;
1308
1309         res_attr_name = (char *)(res_attr + 1);
1310
1311         sysfs_bin_attr_init(res_attr);
1312         if (write_combine) {
1313                 pdev->res_attr_wc[num] = res_attr;
1314                 sprintf(res_attr_name, "resource%d_wc", num);
1315                 res_attr->mmap = pci_mmap_resource_wc;
1316         } else {
1317                 pdev->res_attr[num] = res_attr;
1318                 sprintf(res_attr_name, "resource%d", num);
1319                 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1320                         res_attr->read = pci_read_resource_io;
1321                         res_attr->write = pci_write_resource_io;
1322                         if (arch_can_pci_mmap_io())
1323                                 res_attr->mmap = pci_mmap_resource_uc;
1324                 } else {
1325                         res_attr->mmap = pci_mmap_resource_uc;
1326                 }
1327         }
1328         res_attr->attr.name = res_attr_name;
1329         res_attr->attr.mode = S_IRUSR | S_IWUSR;
1330         res_attr->size = pci_resource_len(pdev, num);
1331         res_attr->private = (void *)(unsigned long)num;
1332         retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1333         if (retval)
1334                 kfree(res_attr);
1335
1336         return retval;
1337 }
1338
1339 /**
1340  * pci_create_resource_files - create resource files in sysfs for @dev
1341  * @pdev: dev in question
1342  *
1343  * Walk the resources in @pdev creating files for each resource available.
1344  */
1345 static int pci_create_resource_files(struct pci_dev *pdev)
1346 {
1347         int i;
1348         int retval;
1349
1350         /* Expose the PCI resources from this device as files */
1351         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1352
1353                 /* skip empty resources */
1354                 if (!pci_resource_len(pdev, i))
1355                         continue;
1356
1357                 retval = pci_create_attr(pdev, i, 0);
1358                 /* for prefetchable resources, create a WC mappable file */
1359                 if (!retval && arch_can_pci_mmap_wc() &&
1360                     pdev->resource[i].flags & IORESOURCE_PREFETCH)
1361                         retval = pci_create_attr(pdev, i, 1);
1362                 if (retval) {
1363                         pci_remove_resource_files(pdev);
1364                         return retval;
1365                 }
1366         }
1367         return 0;
1368 }
1369 #else /* !HAVE_PCI_MMAP */
1370 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1371 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1372 #endif /* HAVE_PCI_MMAP */
1373
1374 /**
1375  * pci_write_rom - used to enable access to the PCI ROM display
1376  * @filp: sysfs file
1377  * @kobj: kernel object handle
1378  * @bin_attr: struct bin_attribute for this file
1379  * @buf: user input
1380  * @off: file offset
1381  * @count: number of byte in input
1382  *
1383  * writing anything except 0 enables it
1384  */
1385 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1386                              struct bin_attribute *bin_attr, char *buf,
1387                              loff_t off, size_t count)
1388 {
1389         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1390
1391         if ((off ==  0) && (*buf == '0') && (count == 2))
1392                 pdev->rom_attr_enabled = 0;
1393         else
1394                 pdev->rom_attr_enabled = 1;
1395
1396         return count;
1397 }
1398
1399 /**
1400  * pci_read_rom - read a PCI ROM
1401  * @filp: sysfs file
1402  * @kobj: kernel object handle
1403  * @bin_attr: struct bin_attribute for this file
1404  * @buf: where to put the data we read from the ROM
1405  * @off: file offset
1406  * @count: number of bytes to read
1407  *
1408  * Put @count bytes starting at @off into @buf from the ROM in the PCI
1409  * device corresponding to @kobj.
1410  */
1411 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1412                             struct bin_attribute *bin_attr, char *buf,
1413                             loff_t off, size_t count)
1414 {
1415         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1416         void __iomem *rom;
1417         size_t size;
1418
1419         if (!pdev->rom_attr_enabled)
1420                 return -EINVAL;
1421
1422         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1423         if (!rom || !size)
1424                 return -EIO;
1425
1426         if (off >= size)
1427                 count = 0;
1428         else {
1429                 if (off + count > size)
1430                         count = size - off;
1431
1432                 memcpy_fromio(buf, rom + off, count);
1433         }
1434         pci_unmap_rom(pdev, rom);
1435
1436         return count;
1437 }
1438
1439 static const struct bin_attribute pci_config_attr = {
1440         .attr = {
1441                 .name = "config",
1442                 .mode = S_IRUGO | S_IWUSR,
1443         },
1444         .size = PCI_CFG_SPACE_SIZE,
1445         .read = pci_read_config,
1446         .write = pci_write_config,
1447 };
1448
1449 static const struct bin_attribute pcie_config_attr = {
1450         .attr = {
1451                 .name = "config",
1452                 .mode = S_IRUGO | S_IWUSR,
1453         },
1454         .size = PCI_CFG_SPACE_EXP_SIZE,
1455         .read = pci_read_config,
1456         .write = pci_write_config,
1457 };
1458
1459 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1460                            const char *buf, size_t count)
1461 {
1462         struct pci_dev *pdev = to_pci_dev(dev);
1463         unsigned long val;
1464         ssize_t result = kstrtoul(buf, 0, &val);
1465
1466         if (result < 0)
1467                 return result;
1468
1469         if (val != 1)
1470                 return -EINVAL;
1471
1472         result = pci_reset_function(pdev);
1473         if (result < 0)
1474                 return result;
1475
1476         return count;
1477 }
1478
1479 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1480
1481 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1482 {
1483         int retval;
1484         struct bin_attribute *attr;
1485
1486         /* If the device has VPD, try to expose it in sysfs. */
1487         if (dev->vpd) {
1488                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1489                 if (!attr)
1490                         return -ENOMEM;
1491
1492                 sysfs_bin_attr_init(attr);
1493                 attr->size = 0;
1494                 attr->attr.name = "vpd";
1495                 attr->attr.mode = S_IRUSR | S_IWUSR;
1496                 attr->read = read_vpd_attr;
1497                 attr->write = write_vpd_attr;
1498                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1499                 if (retval) {
1500                         kfree(attr);
1501                         return retval;
1502                 }
1503                 dev->vpd->attr = attr;
1504         }
1505
1506         /* Active State Power Management */
1507         pcie_aspm_create_sysfs_dev_files(dev);
1508
1509         if (!pci_probe_reset_function(dev)) {
1510                 retval = device_create_file(&dev->dev, &reset_attr);
1511                 if (retval)
1512                         goto error;
1513                 dev->reset_fn = 1;
1514         }
1515         return 0;
1516
1517 error:
1518         pcie_aspm_remove_sysfs_dev_files(dev);
1519         if (dev->vpd && dev->vpd->attr) {
1520                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1521                 kfree(dev->vpd->attr);
1522         }
1523
1524         return retval;
1525 }
1526
1527 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1528 {
1529         int retval;
1530         int rom_size;
1531         struct bin_attribute *attr;
1532
1533         if (!sysfs_initialized)
1534                 return -EACCES;
1535
1536         if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1537                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1538         else
1539                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1540         if (retval)
1541                 goto err;
1542
1543         retval = pci_create_resource_files(pdev);
1544         if (retval)
1545                 goto err_config_file;
1546
1547         /* If the device has a ROM, try to expose it in sysfs. */
1548         rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1549         if (rom_size) {
1550                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1551                 if (!attr) {
1552                         retval = -ENOMEM;
1553                         goto err_resource_files;
1554                 }
1555                 sysfs_bin_attr_init(attr);
1556                 attr->size = rom_size;
1557                 attr->attr.name = "rom";
1558                 attr->attr.mode = S_IRUSR | S_IWUSR;
1559                 attr->read = pci_read_rom;
1560                 attr->write = pci_write_rom;
1561                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1562                 if (retval) {
1563                         kfree(attr);
1564                         goto err_resource_files;
1565                 }
1566                 pdev->rom_attr = attr;
1567         }
1568
1569         /* add sysfs entries for various capabilities */
1570         retval = pci_create_capabilities_sysfs(pdev);
1571         if (retval)
1572                 goto err_rom_file;
1573
1574         pci_create_firmware_label_files(pdev);
1575
1576         return 0;
1577
1578 err_rom_file:
1579         if (pdev->rom_attr) {
1580                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1581                 kfree(pdev->rom_attr);
1582                 pdev->rom_attr = NULL;
1583         }
1584 err_resource_files:
1585         pci_remove_resource_files(pdev);
1586 err_config_file:
1587         if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1588                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1589         else
1590                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1591 err:
1592         return retval;
1593 }
1594
1595 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1596 {
1597         if (dev->vpd && dev->vpd->attr) {
1598                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1599                 kfree(dev->vpd->attr);
1600         }
1601
1602         pcie_aspm_remove_sysfs_dev_files(dev);
1603         if (dev->reset_fn) {
1604                 device_remove_file(&dev->dev, &reset_attr);
1605                 dev->reset_fn = 0;
1606         }
1607 }
1608
1609 /**
1610  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1611  * @pdev: device whose entries we should free
1612  *
1613  * Cleanup when @pdev is removed from sysfs.
1614  */
1615 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1616 {
1617         if (!sysfs_initialized)
1618                 return;
1619
1620         pci_remove_capabilities_sysfs(pdev);
1621
1622         if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1623                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1624         else
1625                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1626
1627         pci_remove_resource_files(pdev);
1628
1629         if (pdev->rom_attr) {
1630                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1631                 kfree(pdev->rom_attr);
1632                 pdev->rom_attr = NULL;
1633         }
1634
1635         pci_remove_firmware_label_files(pdev);
1636 }
1637
1638 static int __init pci_sysfs_init(void)
1639 {
1640         struct pci_dev *pdev = NULL;
1641         int retval;
1642
1643         sysfs_initialized = 1;
1644         for_each_pci_dev(pdev) {
1645                 retval = pci_create_sysfs_dev_files(pdev);
1646                 if (retval) {
1647                         pci_dev_put(pdev);
1648                         return retval;
1649                 }
1650         }
1651
1652         return 0;
1653 }
1654 late_initcall(pci_sysfs_init);
1655
1656 static struct attribute *pci_dev_dev_attrs[] = {
1657         &vga_attr.attr,
1658         NULL,
1659 };
1660
1661 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1662                                          struct attribute *a, int n)
1663 {
1664         struct device *dev = kobj_to_dev(kobj);
1665         struct pci_dev *pdev = to_pci_dev(dev);
1666
1667         if (a == &vga_attr.attr)
1668                 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1669                         return 0;
1670
1671         return a->mode;
1672 }
1673
1674 static struct attribute *pci_dev_hp_attrs[] = {
1675         &dev_remove_attr.attr,
1676         &dev_rescan_attr.attr,
1677         NULL,
1678 };
1679
1680 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1681                                             struct attribute *a, int n)
1682 {
1683         struct device *dev = kobj_to_dev(kobj);
1684         struct pci_dev *pdev = to_pci_dev(dev);
1685
1686         if (pdev->is_virtfn)
1687                 return 0;
1688
1689         return a->mode;
1690 }
1691
1692 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1693                                             struct attribute *a, int n)
1694 {
1695         struct device *dev = kobj_to_dev(kobj);
1696         struct pci_dev *pdev = to_pci_dev(dev);
1697
1698         if (pci_is_bridge(pdev))
1699                 return a->mode;
1700
1701         return 0;
1702 }
1703
1704 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1705                                           struct attribute *a, int n)
1706 {
1707         struct device *dev = kobj_to_dev(kobj);
1708         struct pci_dev *pdev = to_pci_dev(dev);
1709
1710         if (pci_is_pcie(pdev))
1711                 return a->mode;
1712
1713         return 0;
1714 }
1715
1716 static const struct attribute_group pci_dev_group = {
1717         .attrs = pci_dev_attrs,
1718 };
1719
1720 const struct attribute_group *pci_dev_groups[] = {
1721         &pci_dev_group,
1722         NULL,
1723 };
1724
1725 static const struct attribute_group pci_bridge_group = {
1726         .attrs = pci_bridge_attrs,
1727 };
1728
1729 const struct attribute_group *pci_bridge_groups[] = {
1730         &pci_bridge_group,
1731         NULL,
1732 };
1733
1734 static const struct attribute_group pcie_dev_group = {
1735         .attrs = pcie_dev_attrs,
1736 };
1737
1738 const struct attribute_group *pcie_dev_groups[] = {
1739         &pcie_dev_group,
1740         NULL,
1741 };
1742
1743 static const struct attribute_group pci_dev_hp_attr_group = {
1744         .attrs = pci_dev_hp_attrs,
1745         .is_visible = pci_dev_hp_attrs_are_visible,
1746 };
1747
1748 #ifdef CONFIG_PCI_IOV
1749 static struct attribute *sriov_dev_attrs[] = {
1750         &sriov_totalvfs_attr.attr,
1751         &sriov_numvfs_attr.attr,
1752         &sriov_drivers_autoprobe_attr.attr,
1753         NULL,
1754 };
1755
1756 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1757                                        struct attribute *a, int n)
1758 {
1759         struct device *dev = kobj_to_dev(kobj);
1760
1761         if (!dev_is_pf(dev))
1762                 return 0;
1763
1764         return a->mode;
1765 }
1766
1767 static const struct attribute_group sriov_dev_attr_group = {
1768         .attrs = sriov_dev_attrs,
1769         .is_visible = sriov_attrs_are_visible,
1770 };
1771 #endif /* CONFIG_PCI_IOV */
1772
1773 static const struct attribute_group pci_dev_attr_group = {
1774         .attrs = pci_dev_dev_attrs,
1775         .is_visible = pci_dev_attrs_are_visible,
1776 };
1777
1778 static const struct attribute_group pci_bridge_attr_group = {
1779         .attrs = pci_bridge_attrs,
1780         .is_visible = pci_bridge_attrs_are_visible,
1781 };
1782
1783 static const struct attribute_group pcie_dev_attr_group = {
1784         .attrs = pcie_dev_attrs,
1785         .is_visible = pcie_dev_attrs_are_visible,
1786 };
1787
1788 static const struct attribute_group *pci_dev_attr_groups[] = {
1789         &pci_dev_attr_group,
1790         &pci_dev_hp_attr_group,
1791 #ifdef CONFIG_PCI_IOV
1792         &sriov_dev_attr_group,
1793 #endif
1794         &pci_bridge_attr_group,
1795         &pcie_dev_attr_group,
1796         NULL,
1797 };
1798
1799 struct device_type pci_dev_type = {
1800         .groups = pci_dev_attr_groups,
1801 };