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