drivers/pci/pci-sysfs.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
broken_parity_status_show
broken_parity_status_store
pci_dev_show_local_cpu
local_cpus_show
local_cpulist_show
cpuaffinity_show
cpulistaffinity_show
resource_show
max_link_speed_show
max_link_width_show
current_link_speed_show
current_link_width_show
secondary_bus_number_show
subordinate_bus_number_show
ari_enabled_show
modalias_show
enable_store
enable_show
numa_node_store
numa_node_show
dma_mask_bits_show
consistent_dma_mask_bits_show
msi_bus_show
msi_bus_store
rescan_store
dev_rescan_store
remove_store
bus_rescan_store
d3cold_allowed_store
d3cold_allowed_show
devspec_show
driver_override_store
driver_override_show
boot_vga_show
pci_read_config
pci_write_config
pci_read_legacy_io
pci_write_legacy_io
pci_mmap_legacy_mem
pci_mmap_legacy_io
pci_adjust_legacy_attr
pci_create_legacy_files
pci_remove_legacy_files
pci_mmap_fits
pci_mmap_resource
pci_mmap_resource_uc
pci_mmap_resource_wc
pci_resource_io
pci_read_resource_io
pci_write_resource_io
pci_remove_resource_files
pci_create_attr
pci_create_resource_files
pci_create_resource_files
pci_remove_resource_files
pci_write_rom
pci_read_rom
reset_store
pci_create_capabilities_sysfs
pci_create_sysfs_dev_files
pci_remove_capabilities_sysfs
pci_remove_sysfs_dev_files
pci_sysfs_init
pci_dev_attrs_are_visible
pci_dev_hp_attrs_are_visible
pci_bridge_attrs_are_visible
pcie_dev_attrs_are_visible
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
   4  * (C) Copyright 2002-2004 IBM Corp.
   5  * (C) Copyright 2003 Matthew Wilcox
   6  * (C) Copyright 2003 Hewlett-Packard
   7  * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
   8  * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
   9  *
  10  * File attributes for PCI devices
  11  *
  12  * Modeled after usb's driverfs.c
  13  */
  14 
  15 
  16 #include <linux/kernel.h>
  17 #include <linux/sched.h>
  18 #include <linux/pci.h>
  19 #include <linux/stat.h>
  20 #include <linux/export.h>
  21 #include <linux/topology.h>
  22 #include <linux/mm.h>
  23 #include <linux/fs.h>
  24 #include <linux/capability.h>
  25 #include <linux/security.h>
  26 #include <linux/slab.h>
  27 #include <linux/vgaarb.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/of.h>
  30 #include "pci.h"
  31 
  32 static int sysfs_initialized;   /* = 0 */
  33 
  34 /* show configuration fields */
  35 #define pci_config_attr(field, format_string)                           \
  36 static ssize_t                                                          \
  37 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  38 {                                                                       \
  39         struct pci_dev *pdev;                                           \
  40                                                                         \
  41         pdev = to_pci_dev(dev);                                         \
  42         return sprintf(buf, format_string, pdev->field);                \
  43 }                                                                       \
  44 static DEVICE_ATTR_RO(field)
  45 
  46 pci_config_attr(vendor, "0x%04x\n");
  47 pci_config_attr(device, "0x%04x\n");
  48 pci_config_attr(subsystem_vendor, "0x%04x\n");
  49 pci_config_attr(subsystem_device, "0x%04x\n");
  50 pci_config_attr(revision, "0x%02x\n");
  51 pci_config_attr(class, "0x%06x\n");
  52 pci_config_attr(irq, "%u\n");
  53 
  54 static ssize_t broken_parity_status_show(struct device *dev,
  55                                          struct device_attribute *attr,
  56                                          char *buf)
  57 {
  58         struct pci_dev *pdev = to_pci_dev(dev);
  59         return sprintf(buf, "%u\n", pdev->broken_parity_status);
  60 }
  61 
  62 static ssize_t broken_parity_status_store(struct device *dev,
  63                                           struct device_attribute *attr,
  64                                           const char *buf, size_t count)
  65 {
  66         struct pci_dev *pdev = to_pci_dev(dev);
  67         unsigned long val;
  68 
  69         if (kstrtoul(buf, 0, &val) < 0)
  70                 return -EINVAL;
  71 
  72         pdev->broken_parity_status = !!val;
  73 
  74         return count;
  75 }
  76 static DEVICE_ATTR_RW(broken_parity_status);
  77 
  78 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
  79                                       struct device_attribute *attr, char *buf)
  80 {
  81         const struct cpumask *mask;
  82 
  83 #ifdef CONFIG_NUMA
  84         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  85                                           cpumask_of_node(dev_to_node(dev));
  86 #else
  87         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  88 #endif
  89         return cpumap_print_to_pagebuf(list, buf, mask);
  90 }
  91 
  92 static ssize_t local_cpus_show(struct device *dev,
  93                                struct device_attribute *attr, char *buf)
  94 {
  95         return pci_dev_show_local_cpu(dev, false, attr, buf);
  96 }
  97 static DEVICE_ATTR_RO(local_cpus);
  98 
  99 static ssize_t local_cpulist_show(struct device *dev,
 100                                   struct device_attribute *attr, char *buf)
 101 {
 102         return pci_dev_show_local_cpu(dev, true, attr, buf);
 103 }
 104 static DEVICE_ATTR_RO(local_cpulist);
 105 
 106 /*
 107  * PCI Bus Class Devices
 108  */
 109 static ssize_t cpuaffinity_show(struct device *dev,
 110                                 struct device_attribute *attr, char *buf)
 111 {
 112         const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 113 
 114         return cpumap_print_to_pagebuf(false, buf, cpumask);
 115 }
 116 static DEVICE_ATTR_RO(cpuaffinity);
 117 
 118 static ssize_t cpulistaffinity_show(struct device *dev,
 119                                     struct device_attribute *attr, char *buf)
 120 {
 121         const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 122 
 123         return cpumap_print_to_pagebuf(true, buf, cpumask);
 124 }
 125 static DEVICE_ATTR_RO(cpulistaffinity);
 126 
 127 /* show resources */
 128 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
 129                              char *buf)
 130 {
 131         struct pci_dev *pci_dev = to_pci_dev(dev);
 132         char *str = buf;
 133         int i;
 134         int max;
 135         resource_size_t start, end;
 136 
 137         if (pci_dev->subordinate)
 138                 max = DEVICE_COUNT_RESOURCE;
 139         else
 140                 max = PCI_BRIDGE_RESOURCES;
 141 
 142         for (i = 0; i < max; i++) {
 143                 struct resource *res =  &pci_dev->resource[i];
 144                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 145                 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
 146                                (unsigned long long)start,
 147                                (unsigned long long)end,
 148                                (unsigned long long)res->flags);
 149         }
 150         return (str - buf);
 151 }
 152 static DEVICE_ATTR_RO(resource);
 153 
 154 static ssize_t max_link_speed_show(struct device *dev,
 155                                    struct device_attribute *attr, char *buf)
 156 {
 157         struct pci_dev *pdev = to_pci_dev(dev);
 158 
 159         return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
 160 }
 161 static DEVICE_ATTR_RO(max_link_speed);
 162 
 163 static ssize_t max_link_width_show(struct device *dev,
 164                                    struct device_attribute *attr, char *buf)
 165 {
 166         struct pci_dev *pdev = to_pci_dev(dev);
 167 
 168         return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
 169 }
 170 static DEVICE_ATTR_RO(max_link_width);
 171 
 172 static ssize_t current_link_speed_show(struct device *dev,
 173                                        struct device_attribute *attr, char *buf)
 174 {
 175         struct pci_dev *pci_dev = to_pci_dev(dev);
 176         u16 linkstat;
 177         int err;
 178         const char *speed;
 179 
 180         err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
 181         if (err)
 182                 return -EINVAL;
 183 
 184         switch (linkstat & PCI_EXP_LNKSTA_CLS) {
 185         case PCI_EXP_LNKSTA_CLS_32_0GB:
 186                 speed = "32 GT/s";
 187                 break;
 188         case PCI_EXP_LNKSTA_CLS_16_0GB:
 189                 speed = "16 GT/s";
 190                 break;
 191         case PCI_EXP_LNKSTA_CLS_8_0GB:
 192                 speed = "8 GT/s";
 193                 break;
 194         case PCI_EXP_LNKSTA_CLS_5_0GB:
 195                 speed = "5 GT/s";
 196                 break;
 197         case PCI_EXP_LNKSTA_CLS_2_5GB:
 198                 speed = "2.5 GT/s";
 199                 break;
 200         default:
 201                 speed = "Unknown speed";
 202         }
 203 
 204         return sprintf(buf, "%s\n", speed);
 205 }
 206 static DEVICE_ATTR_RO(current_link_speed);
 207 
 208 static ssize_t current_link_width_show(struct device *dev,
 209                                        struct device_attribute *attr, char *buf)
 210 {
 211         struct pci_dev *pci_dev = to_pci_dev(dev);
 212         u16 linkstat;
 213         int err;
 214 
 215         err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
 216         if (err)
 217                 return -EINVAL;
 218 
 219         return sprintf(buf, "%u\n",
 220                 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
 221 }
 222 static DEVICE_ATTR_RO(current_link_width);
 223 
 224 static ssize_t secondary_bus_number_show(struct device *dev,
 225                                          struct device_attribute *attr,
 226                                          char *buf)
 227 {
 228         struct pci_dev *pci_dev = to_pci_dev(dev);
 229         u8 sec_bus;
 230         int err;
 231 
 232         err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
 233         if (err)
 234                 return -EINVAL;
 235 
 236         return sprintf(buf, "%u\n", sec_bus);
 237 }
 238 static DEVICE_ATTR_RO(secondary_bus_number);
 239 
 240 static ssize_t subordinate_bus_number_show(struct device *dev,
 241                                            struct device_attribute *attr,
 242                                            char *buf)
 243 {
 244         struct pci_dev *pci_dev = to_pci_dev(dev);
 245         u8 sub_bus;
 246         int err;
 247 
 248         err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
 249         if (err)
 250                 return -EINVAL;
 251 
 252         return sprintf(buf, "%u\n", sub_bus);
 253 }
 254 static DEVICE_ATTR_RO(subordinate_bus_number);
 255 
 256 static ssize_t ari_enabled_show(struct device *dev,
 257                                 struct device_attribute *attr,
 258                                 char *buf)
 259 {
 260         struct pci_dev *pci_dev = to_pci_dev(dev);
 261 
 262         return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
 263 }
 264 static DEVICE_ATTR_RO(ari_enabled);
 265 
 266 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 267                              char *buf)
 268 {
 269         struct pci_dev *pci_dev = to_pci_dev(dev);
 270 
 271         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
 272                        pci_dev->vendor, pci_dev->device,
 273                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 274                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 275                        (u8)(pci_dev->class));
 276 }
 277 static DEVICE_ATTR_RO(modalias);
 278 
 279 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
 280                              const char *buf, size_t count)
 281 {
 282         struct pci_dev *pdev = to_pci_dev(dev);
 283         unsigned long val;
 284         ssize_t result = kstrtoul(buf, 0, &val);
 285 
 286         if (result < 0)
 287                 return result;
 288 
 289         /* this can crash the machine when done on the "wrong" device */
 290         if (!capable(CAP_SYS_ADMIN))
 291                 return -EPERM;
 292 
 293         device_lock(dev);
 294         if (dev->driver)
 295                 result = -EBUSY;
 296         else if (val)
 297                 result = pci_enable_device(pdev);
 298         else if (pci_is_enabled(pdev))
 299                 pci_disable_device(pdev);
 300         else
 301                 result = -EIO;
 302         device_unlock(dev);
 303 
 304         return result < 0 ? result : count;
 305 }
 306 
 307 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
 308                             char *buf)
 309 {
 310         struct pci_dev *pdev;
 311 
 312         pdev = to_pci_dev(dev);
 313         return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
 314 }
 315 static DEVICE_ATTR_RW(enable);
 316 
 317 #ifdef CONFIG_NUMA
 318 static ssize_t numa_node_store(struct device *dev,
 319                                struct device_attribute *attr, const char *buf,
 320                                size_t count)
 321 {
 322         struct pci_dev *pdev = to_pci_dev(dev);
 323         int node, ret;
 324 
 325         if (!capable(CAP_SYS_ADMIN))
 326                 return -EPERM;
 327 
 328         ret = kstrtoint(buf, 0, &node);
 329         if (ret)
 330                 return ret;
 331 
 332         if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
 333                 return -EINVAL;
 334 
 335         if (node != NUMA_NO_NODE && !node_online(node))
 336                 return -EINVAL;
 337 
 338         add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
 339         pci_alert(pdev, FW_BUG "Overriding NUMA node to %d.  Contact your vendor for updates.",
 340                   node);
 341 
 342         dev->numa_node = node;
 343         return count;
 344 }
 345 
 346 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
 347                               char *buf)
 348 {
 349         return sprintf(buf, "%d\n", dev->numa_node);
 350 }
 351 static DEVICE_ATTR_RW(numa_node);
 352 #endif
 353 
 354 static ssize_t dma_mask_bits_show(struct device *dev,
 355                                   struct device_attribute *attr, char *buf)
 356 {
 357         struct pci_dev *pdev = to_pci_dev(dev);
 358 
 359         return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
 360 }
 361 static DEVICE_ATTR_RO(dma_mask_bits);
 362 
 363 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
 364                                              struct device_attribute *attr,
 365                                              char *buf)
 366 {
 367         return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
 368 }
 369 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
 370 
 371 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
 372                             char *buf)
 373 {
 374         struct pci_dev *pdev = to_pci_dev(dev);
 375         struct pci_bus *subordinate = pdev->subordinate;
 376 
 377         return sprintf(buf, "%u\n", subordinate ?
 378                        !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
 379                            : !pdev->no_msi);
 380 }
 381 
 382 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
 383                              const char *buf, size_t count)
 384 {
 385         struct pci_dev *pdev = to_pci_dev(dev);
 386         struct pci_bus *subordinate = pdev->subordinate;
 387         unsigned long val;
 388 
 389         if (kstrtoul(buf, 0, &val) < 0)
 390                 return -EINVAL;
 391 
 392         if (!capable(CAP_SYS_ADMIN))
 393                 return -EPERM;
 394 
 395         /*
 396          * "no_msi" and "bus_flags" only affect what happens when a driver
 397          * requests MSI or MSI-X.  They don't affect any drivers that have
 398          * already requested MSI or MSI-X.
 399          */
 400         if (!subordinate) {
 401                 pdev->no_msi = !val;
 402                 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
 403                          val ? "allowed" : "disallowed");
 404                 return count;
 405         }
 406 
 407         if (val)
 408                 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
 409         else
 410                 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 411 
 412         dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
 413                  val ? "allowed" : "disallowed");
 414         return count;
 415 }
 416 static DEVICE_ATTR_RW(msi_bus);
 417 
 418 static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
 419 {
 420         unsigned long val;
 421         struct pci_bus *b = NULL;
 422 
 423         if (kstrtoul(buf, 0, &val) < 0)
 424                 return -EINVAL;
 425 
 426         if (val) {
 427                 pci_lock_rescan_remove();
 428                 while ((b = pci_find_next_bus(b)) != NULL)
 429                         pci_rescan_bus(b);
 430                 pci_unlock_rescan_remove();
 431         }
 432         return count;
 433 }
 434 static BUS_ATTR_WO(rescan);
 435 
 436 static struct attribute *pci_bus_attrs[] = {
 437         &bus_attr_rescan.attr,
 438         NULL,
 439 };
 440 
 441 static const struct attribute_group pci_bus_group = {
 442         .attrs = pci_bus_attrs,
 443 };
 444 
 445 const struct attribute_group *pci_bus_groups[] = {
 446         &pci_bus_group,
 447         NULL,
 448 };
 449 
 450 static ssize_t dev_rescan_store(struct device *dev,
 451                                 struct device_attribute *attr, const char *buf,
 452                                 size_t count)
 453 {
 454         unsigned long val;
 455         struct pci_dev *pdev = to_pci_dev(dev);
 456 
 457         if (kstrtoul(buf, 0, &val) < 0)
 458                 return -EINVAL;
 459 
 460         if (val) {
 461                 pci_lock_rescan_remove();
 462                 pci_rescan_bus(pdev->bus);
 463                 pci_unlock_rescan_remove();
 464         }
 465         return count;
 466 }
 467 static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
 468                                                             dev_rescan_store);
 469 
 470 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
 471                             const char *buf, size_t count)
 472 {
 473         unsigned long val;
 474 
 475         if (kstrtoul(buf, 0, &val) < 0)
 476                 return -EINVAL;
 477 
 478         if (val && device_remove_file_self(dev, attr))
 479                 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
 480         return count;
 481 }
 482 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
 483                                   remove_store);
 484 
 485 static ssize_t bus_rescan_store(struct device *dev,
 486                                 struct device_attribute *attr,
 487                                 const char *buf, size_t count)
 488 {
 489         unsigned long val;
 490         struct pci_bus *bus = to_pci_bus(dev);
 491 
 492         if (kstrtoul(buf, 0, &val) < 0)
 493                 return -EINVAL;
 494 
 495         if (val) {
 496                 pci_lock_rescan_remove();
 497                 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
 498                         pci_rescan_bus_bridge_resize(bus->self);
 499                 else
 500                         pci_rescan_bus(bus);
 501                 pci_unlock_rescan_remove();
 502         }
 503         return count;
 504 }
 505 static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
 506                                                             bus_rescan_store);
 507 
 508 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
 509 static ssize_t d3cold_allowed_store(struct device *dev,
 510                                     struct device_attribute *attr,
 511                                     const char *buf, size_t count)
 512 {
 513         struct pci_dev *pdev = to_pci_dev(dev);
 514         unsigned long val;
 515 
 516         if (kstrtoul(buf, 0, &val) < 0)
 517                 return -EINVAL;
 518 
 519         pdev->d3cold_allowed = !!val;
 520         if (pdev->d3cold_allowed)
 521                 pci_d3cold_enable(pdev);
 522         else
 523                 pci_d3cold_disable(pdev);
 524 
 525         pm_runtime_resume(dev);
 526 
 527         return count;
 528 }
 529 
 530 static ssize_t d3cold_allowed_show(struct device *dev,
 531                                    struct device_attribute *attr, char *buf)
 532 {
 533         struct pci_dev *pdev = to_pci_dev(dev);
 534         return sprintf(buf, "%u\n", pdev->d3cold_allowed);
 535 }
 536 static DEVICE_ATTR_RW(d3cold_allowed);
 537 #endif
 538 
 539 #ifdef CONFIG_OF
 540 static ssize_t devspec_show(struct device *dev,
 541                             struct device_attribute *attr, char *buf)
 542 {
 543         struct pci_dev *pdev = to_pci_dev(dev);
 544         struct device_node *np = pci_device_to_OF_node(pdev);
 545 
 546         if (np == NULL)
 547                 return 0;
 548         return sprintf(buf, "%pOF", np);
 549 }
 550 static DEVICE_ATTR_RO(devspec);
 551 #endif
 552 
 553 static ssize_t driver_override_store(struct device *dev,
 554                                      struct device_attribute *attr,
 555                                      const char *buf, size_t count)
 556 {
 557         struct pci_dev *pdev = to_pci_dev(dev);
 558         char *driver_override, *old, *cp;
 559 
 560         /* We need to keep extra room for a newline */
 561         if (count >= (PAGE_SIZE - 1))
 562                 return -EINVAL;
 563 
 564         driver_override = kstrndup(buf, count, GFP_KERNEL);
 565         if (!driver_override)
 566                 return -ENOMEM;
 567 
 568         cp = strchr(driver_override, '\n');
 569         if (cp)
 570                 *cp = '\0';
 571 
 572         device_lock(dev);
 573         old = pdev->driver_override;
 574         if (strlen(driver_override)) {
 575                 pdev->driver_override = driver_override;
 576         } else {
 577                 kfree(driver_override);
 578                 pdev->driver_override = NULL;
 579         }
 580         device_unlock(dev);
 581 
 582         kfree(old);
 583 
 584         return count;
 585 }
 586 
 587 static ssize_t driver_override_show(struct device *dev,
 588                                     struct device_attribute *attr, char *buf)
 589 {
 590         struct pci_dev *pdev = to_pci_dev(dev);
 591         ssize_t len;
 592 
 593         device_lock(dev);
 594         len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
 595         device_unlock(dev);
 596         return len;
 597 }
 598 static DEVICE_ATTR_RW(driver_override);
 599 
 600 static struct attribute *pci_dev_attrs[] = {
 601         &dev_attr_resource.attr,
 602         &dev_attr_vendor.attr,
 603         &dev_attr_device.attr,
 604         &dev_attr_subsystem_vendor.attr,
 605         &dev_attr_subsystem_device.attr,
 606         &dev_attr_revision.attr,
 607         &dev_attr_class.attr,
 608         &dev_attr_irq.attr,
 609         &dev_attr_local_cpus.attr,
 610         &dev_attr_local_cpulist.attr,
 611         &dev_attr_modalias.attr,
 612 #ifdef CONFIG_NUMA
 613         &dev_attr_numa_node.attr,
 614 #endif
 615         &dev_attr_dma_mask_bits.attr,
 616         &dev_attr_consistent_dma_mask_bits.attr,
 617         &dev_attr_enable.attr,
 618         &dev_attr_broken_parity_status.attr,
 619         &dev_attr_msi_bus.attr,
 620 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
 621         &dev_attr_d3cold_allowed.attr,
 622 #endif
 623 #ifdef CONFIG_OF
 624         &dev_attr_devspec.attr,
 625 #endif
 626         &dev_attr_driver_override.attr,
 627         &dev_attr_ari_enabled.attr,
 628         NULL,
 629 };
 630 
 631 static struct attribute *pci_bridge_attrs[] = {
 632         &dev_attr_subordinate_bus_number.attr,
 633         &dev_attr_secondary_bus_number.attr,
 634         NULL,
 635 };
 636 
 637 static struct attribute *pcie_dev_attrs[] = {
 638         &dev_attr_current_link_speed.attr,
 639         &dev_attr_current_link_width.attr,
 640         &dev_attr_max_link_width.attr,
 641         &dev_attr_max_link_speed.attr,
 642         NULL,
 643 };
 644 
 645 static struct attribute *pcibus_attrs[] = {
 646         &dev_attr_bus_rescan.attr,
 647         &dev_attr_cpuaffinity.attr,
 648         &dev_attr_cpulistaffinity.attr,
 649         NULL,
 650 };
 651 
 652 static const struct attribute_group pcibus_group = {
 653         .attrs = pcibus_attrs,
 654 };
 655 
 656 const struct attribute_group *pcibus_groups[] = {
 657         &pcibus_group,
 658         NULL,
 659 };
 660 
 661 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
 662                              char *buf)
 663 {
 664         struct pci_dev *pdev = to_pci_dev(dev);
 665         struct pci_dev *vga_dev = vga_default_device();
 666 
 667         if (vga_dev)
 668                 return sprintf(buf, "%u\n", (pdev == vga_dev));
 669 
 670         return sprintf(buf, "%u\n",
 671                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 672                    IORESOURCE_ROM_SHADOW));
 673 }
 674 static DEVICE_ATTR_RO(boot_vga);
 675 
 676 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
 677                                struct bin_attribute *bin_attr, char *buf,
 678                                loff_t off, size_t count)
 679 {
 680         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 681         unsigned int size = 64;
 682         loff_t init_off = off;
 683         u8 *data = (u8 *) buf;
 684 
 685         /* Several chips lock up trying to read undefined config space */
 686         if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
 687                 size = dev->cfg_size;
 688         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 689                 size = 128;
 690 
 691         if (off > size)
 692                 return 0;
 693         if (off + count > size) {
 694                 size -= off;
 695                 count = size;
 696         } else {
 697                 size = count;
 698         }
 699 
 700         pci_config_pm_runtime_get(dev);
 701 
 702         if ((off & 1) && size) {
 703                 u8 val;
 704                 pci_user_read_config_byte(dev, off, &val);
 705                 data[off - init_off] = val;
 706                 off++;
 707                 size--;
 708         }
 709 
 710         if ((off & 3) && size > 2) {
 711                 u16 val;
 712                 pci_user_read_config_word(dev, off, &val);
 713                 data[off - init_off] = val & 0xff;
 714                 data[off - init_off + 1] = (val >> 8) & 0xff;
 715                 off += 2;
 716                 size -= 2;
 717         }
 718 
 719         while (size > 3) {
 720                 u32 val;
 721                 pci_user_read_config_dword(dev, off, &val);
 722                 data[off - init_off] = val & 0xff;
 723                 data[off - init_off + 1] = (val >> 8) & 0xff;
 724                 data[off - init_off + 2] = (val >> 16) & 0xff;
 725                 data[off - init_off + 3] = (val >> 24) & 0xff;
 726                 off += 4;
 727                 size -= 4;
 728         }
 729 
 730         if (size >= 2) {
 731                 u16 val;
 732                 pci_user_read_config_word(dev, off, &val);
 733                 data[off - init_off] = val & 0xff;
 734                 data[off - init_off + 1] = (val >> 8) & 0xff;
 735                 off += 2;
 736                 size -= 2;
 737         }
 738 
 739         if (size > 0) {
 740                 u8 val;
 741                 pci_user_read_config_byte(dev, off, &val);
 742                 data[off - init_off] = val;
 743                 off++;
 744                 --size;
 745         }
 746 
 747         pci_config_pm_runtime_put(dev);
 748 
 749         return count;
 750 }
 751 
 752 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
 753                                 struct bin_attribute *bin_attr, char *buf,
 754                                 loff_t off, size_t count)
 755 {
 756         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 757         unsigned int size = count;
 758         loff_t init_off = off;
 759         u8 *data = (u8 *) buf;
 760         int ret;
 761 
 762         ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
 763         if (ret)
 764                 return ret;
 765 
 766         if (off > dev->cfg_size)
 767                 return 0;
 768         if (off + count > dev->cfg_size) {
 769                 size = dev->cfg_size - off;
 770                 count = size;
 771         }
 772 
 773         pci_config_pm_runtime_get(dev);
 774 
 775         if ((off & 1) && size) {
 776                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 777                 off++;
 778                 size--;
 779         }
 780 
 781         if ((off & 3) && size > 2) {
 782                 u16 val = data[off - init_off];
 783                 val |= (u16) data[off - init_off + 1] << 8;
 784                 pci_user_write_config_word(dev, off, val);
 785                 off += 2;
 786                 size -= 2;
 787         }
 788 
 789         while (size > 3) {
 790                 u32 val = data[off - init_off];
 791                 val |= (u32) data[off - init_off + 1] << 8;
 792                 val |= (u32) data[off - init_off + 2] << 16;
 793                 val |= (u32) data[off - init_off + 3] << 24;
 794                 pci_user_write_config_dword(dev, off, val);
 795                 off += 4;
 796                 size -= 4;
 797         }
 798 
 799         if (size >= 2) {
 800                 u16 val = data[off - init_off];
 801                 val |= (u16) data[off - init_off + 1] << 8;
 802                 pci_user_write_config_word(dev, off, val);
 803                 off += 2;
 804                 size -= 2;
 805         }
 806 
 807         if (size) {
 808                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 809                 off++;
 810                 --size;
 811         }
 812 
 813         pci_config_pm_runtime_put(dev);
 814 
 815         return count;
 816 }
 817 
 818 #ifdef HAVE_PCI_LEGACY
 819 /**
 820  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 821  * @filp: open sysfs file
 822  * @kobj: kobject corresponding to file to read from
 823  * @bin_attr: struct bin_attribute for this file
 824  * @buf: buffer to store results
 825  * @off: offset into legacy I/O port space
 826  * @count: number of bytes to read
 827  *
 828  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 829  * callback routine (pci_legacy_read).
 830  */
 831 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 832                                   struct bin_attribute *bin_attr, char *buf,
 833                                   loff_t off, size_t count)
 834 {
 835         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
 836 
 837         /* Only support 1, 2 or 4 byte accesses */
 838         if (count != 1 && count != 2 && count != 4)
 839                 return -EINVAL;
 840 
 841         return pci_legacy_read(bus, off, (u32 *)buf, count);
 842 }
 843 
 844 /**
 845  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 846  * @filp: open sysfs file
 847  * @kobj: kobject corresponding to file to read from
 848  * @bin_attr: struct bin_attribute for this file
 849  * @buf: buffer containing value to be written
 850  * @off: offset into legacy I/O port space
 851  * @count: number of bytes to write
 852  *
 853  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 854  * callback routine (pci_legacy_write).
 855  */
 856 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 857                                    struct bin_attribute *bin_attr, char *buf,
 858                                    loff_t off, size_t count)
 859 {
 860         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
 861 
 862         /* Only support 1, 2 or 4 byte accesses */
 863         if (count != 1 && count != 2 && count != 4)
 864                 return -EINVAL;
 865 
 866         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 867 }
 868 
 869 /**
 870  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 871  * @filp: open sysfs file
 872  * @kobj: kobject corresponding to device to be mapped
 873  * @attr: struct bin_attribute for this file
 874  * @vma: struct vm_area_struct passed to mmap
 875  *
 876  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 877  * legacy memory space (first meg of bus space) into application virtual
 878  * memory space.
 879  */
 880 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 881                                struct bin_attribute *attr,
 882                                struct vm_area_struct *vma)
 883 {
 884         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
 885 
 886         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 887 }
 888 
 889 /**
 890  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 891  * @filp: open sysfs file
 892  * @kobj: kobject corresponding to device to be mapped
 893  * @attr: struct bin_attribute for this file
 894  * @vma: struct vm_area_struct passed to mmap
 895  *
 896  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 897  * legacy IO space (first meg of bus space) into application virtual
 898  * memory space. Returns -ENOSYS if the operation isn't supported
 899  */
 900 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 901                               struct bin_attribute *attr,
 902                               struct vm_area_struct *vma)
 903 {
 904         struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
 905 
 906         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 907 }
 908 
 909 /**
 910  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 911  * @b: bus to create files under
 912  * @mmap_type: I/O port or memory
 913  *
 914  * Stub implementation. Can be overridden by arch if necessary.
 915  */
 916 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
 917                                    enum pci_mmap_state mmap_type)
 918 {
 919 }
 920 
 921 /**
 922  * pci_create_legacy_files - create legacy I/O port and memory files
 923  * @b: bus to create files under
 924  *
 925  * Some platforms allow access to legacy I/O port and ISA memory space on
 926  * a per-bus basis.  This routine creates the files and ties them into
 927  * their associated read, write and mmap files from pci-sysfs.c
 928  *
 929  * On error unwind, but don't propagate the error to the caller
 930  * as it is ok to set up the PCI bus without these files.
 931  */
 932 void pci_create_legacy_files(struct pci_bus *b)
 933 {
 934         int error;
 935 
 936         b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
 937                                GFP_ATOMIC);
 938         if (!b->legacy_io)
 939                 goto kzalloc_err;
 940 
 941         sysfs_bin_attr_init(b->legacy_io);
 942         b->legacy_io->attr.name = "legacy_io";
 943         b->legacy_io->size = 0xffff;
 944         b->legacy_io->attr.mode = 0600;
 945         b->legacy_io->read = pci_read_legacy_io;
 946         b->legacy_io->write = pci_write_legacy_io;
 947         b->legacy_io->mmap = pci_mmap_legacy_io;
 948         pci_adjust_legacy_attr(b, pci_mmap_io);
 949         error = device_create_bin_file(&b->dev, b->legacy_io);
 950         if (error)
 951                 goto legacy_io_err;
 952 
 953         /* Allocated above after the legacy_io struct */
 954         b->legacy_mem = b->legacy_io + 1;
 955         sysfs_bin_attr_init(b->legacy_mem);
 956         b->legacy_mem->attr.name = "legacy_mem";
 957         b->legacy_mem->size = 1024*1024;
 958         b->legacy_mem->attr.mode = 0600;
 959         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 960         pci_adjust_legacy_attr(b, pci_mmap_mem);
 961         error = device_create_bin_file(&b->dev, b->legacy_mem);
 962         if (error)
 963                 goto legacy_mem_err;
 964 
 965         return;
 966 
 967 legacy_mem_err:
 968         device_remove_bin_file(&b->dev, b->legacy_io);
 969 legacy_io_err:
 970         kfree(b->legacy_io);
 971         b->legacy_io = NULL;
 972 kzalloc_err:
 973         dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
 974 }
 975 
 976 void pci_remove_legacy_files(struct pci_bus *b)
 977 {
 978         if (b->legacy_io) {
 979                 device_remove_bin_file(&b->dev, b->legacy_io);
 980                 device_remove_bin_file(&b->dev, b->legacy_mem);
 981                 kfree(b->legacy_io); /* both are allocated here */
 982         }
 983 }
 984 #endif /* HAVE_PCI_LEGACY */
 985 
 986 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
 987 
 988 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 989                   enum pci_mmap_api mmap_api)
 990 {
 991         unsigned long nr, start, size;
 992         resource_size_t pci_start = 0, pci_end;
 993 
 994         if (pci_resource_len(pdev, resno) == 0)
 995                 return 0;
 996         nr = vma_pages(vma);
 997         start = vma->vm_pgoff;
 998         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 999         if (mmap_api == PCI_MMAP_PROCFS) {
1000                 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1001                                      &pci_start, &pci_end);
1002                 pci_start >>= PAGE_SHIFT;
1003         }
1004         if (start >= pci_start && start < pci_start + size &&
1005                         start + nr <= pci_start + size)
1006                 return 1;
1007         return 0;
1008 }
1009 
1010 /**
1011  * pci_mmap_resource - map a PCI resource into user memory space
1012  * @kobj: kobject for mapping
1013  * @attr: struct bin_attribute for the file being mapped
1014  * @vma: struct vm_area_struct passed into the mmap
1015  * @write_combine: 1 for write_combine mapping
1016  *
1017  * Use the regular PCI mapping routines to map a PCI resource into userspace.
1018  */
1019 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1020                              struct vm_area_struct *vma, int write_combine)
1021 {
1022         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1023         int bar = (unsigned long)attr->private;
1024         enum pci_mmap_state mmap_type;
1025         struct resource *res = &pdev->resource[bar];
1026         int ret;
1027 
1028         ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1029         if (ret)
1030                 return ret;
1031 
1032         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1033                 return -EINVAL;
1034 
1035         if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1036                 return -EINVAL;
1037 
1038         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1039 
1040         return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1041 }
1042 
1043 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1044                                 struct bin_attribute *attr,
1045                                 struct vm_area_struct *vma)
1046 {
1047         return pci_mmap_resource(kobj, attr, vma, 0);
1048 }
1049 
1050 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1051                                 struct bin_attribute *attr,
1052                                 struct vm_area_struct *vma)
1053 {
1054         return pci_mmap_resource(kobj, attr, vma, 1);
1055 }
1056 
1057 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1058                                struct bin_attribute *attr, char *buf,
1059                                loff_t off, size_t count, bool write)
1060 {
1061         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1062         int bar = (unsigned long)attr->private;
1063         unsigned long port = off;
1064 
1065         port += pci_resource_start(pdev, bar);
1066 
1067         if (port > pci_resource_end(pdev, bar))
1068                 return 0;
1069 
1070         if (port + count - 1 > pci_resource_end(pdev, bar))
1071                 return -EINVAL;
1072 
1073         switch (count) {
1074         case 1:
1075                 if (write)
1076                         outb(*(u8 *)buf, port);
1077                 else
1078                         *(u8 *)buf = inb(port);
1079                 return 1;
1080         case 2:
1081                 if (write)
1082                         outw(*(u16 *)buf, port);
1083                 else
1084                         *(u16 *)buf = inw(port);
1085                 return 2;
1086         case 4:
1087                 if (write)
1088                         outl(*(u32 *)buf, port);
1089                 else
1090                         *(u32 *)buf = inl(port);
1091                 return 4;
1092         }
1093         return -EINVAL;
1094 }
1095 
1096 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1097                                     struct bin_attribute *attr, char *buf,
1098                                     loff_t off, size_t count)
1099 {
1100         return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1101 }
1102 
1103 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1104                                      struct bin_attribute *attr, char *buf,
1105                                      loff_t off, size_t count)
1106 {
1107         int ret;
1108 
1109         ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1110         if (ret)
1111                 return ret;
1112 
1113         return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1114 }
1115 
1116 /**
1117  * pci_remove_resource_files - cleanup resource files
1118  * @pdev: dev to cleanup
1119  *
1120  * If we created resource files for @pdev, remove them from sysfs and
1121  * free their resources.
1122  */
1123 static void pci_remove_resource_files(struct pci_dev *pdev)
1124 {
1125         int i;
1126 
1127         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1128                 struct bin_attribute *res_attr;
1129 
1130                 res_attr = pdev->res_attr[i];
1131                 if (res_attr) {
1132                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1133                         kfree(res_attr);
1134                 }
1135 
1136                 res_attr = pdev->res_attr_wc[i];
1137                 if (res_attr) {
1138                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1139                         kfree(res_attr);
1140                 }
1141         }
1142 }
1143 
1144 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1145 {
1146         /* allocate attribute structure, piggyback attribute name */
1147         int name_len = write_combine ? 13 : 10;
1148         struct bin_attribute *res_attr;
1149         char *res_attr_name;
1150         int retval;
1151 
1152         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1153         if (!res_attr)
1154                 return -ENOMEM;
1155 
1156         res_attr_name = (char *)(res_attr + 1);
1157 
1158         sysfs_bin_attr_init(res_attr);
1159         if (write_combine) {
1160                 pdev->res_attr_wc[num] = res_attr;
1161                 sprintf(res_attr_name, "resource%d_wc", num);
1162                 res_attr->mmap = pci_mmap_resource_wc;
1163         } else {
1164                 pdev->res_attr[num] = res_attr;
1165                 sprintf(res_attr_name, "resource%d", num);
1166                 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1167                         res_attr->read = pci_read_resource_io;
1168                         res_attr->write = pci_write_resource_io;
1169                         if (arch_can_pci_mmap_io())
1170                                 res_attr->mmap = pci_mmap_resource_uc;
1171                 } else {
1172                         res_attr->mmap = pci_mmap_resource_uc;
1173                 }
1174         }
1175         res_attr->attr.name = res_attr_name;
1176         res_attr->attr.mode = 0600;
1177         res_attr->size = pci_resource_len(pdev, num);
1178         res_attr->private = (void *)(unsigned long)num;
1179         retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1180         if (retval)
1181                 kfree(res_attr);
1182 
1183         return retval;
1184 }
1185 
1186 /**
1187  * pci_create_resource_files - create resource files in sysfs for @dev
1188  * @pdev: dev in question
1189  *
1190  * Walk the resources in @pdev creating files for each resource available.
1191  */
1192 static int pci_create_resource_files(struct pci_dev *pdev)
1193 {
1194         int i;
1195         int retval;
1196 
1197         /* Expose the PCI resources from this device as files */
1198         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1199 
1200                 /* skip empty resources */
1201                 if (!pci_resource_len(pdev, i))
1202                         continue;
1203 
1204                 retval = pci_create_attr(pdev, i, 0);
1205                 /* for prefetchable resources, create a WC mappable file */
1206                 if (!retval && arch_can_pci_mmap_wc() &&
1207                     pdev->resource[i].flags & IORESOURCE_PREFETCH)
1208                         retval = pci_create_attr(pdev, i, 1);
1209                 if (retval) {
1210                         pci_remove_resource_files(pdev);
1211                         return retval;
1212                 }
1213         }
1214         return 0;
1215 }
1216 #else /* !HAVE_PCI_MMAP */
1217 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1218 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1219 #endif /* HAVE_PCI_MMAP */
1220 
1221 /**
1222  * pci_write_rom - used to enable access to the PCI ROM display
1223  * @filp: sysfs file
1224  * @kobj: kernel object handle
1225  * @bin_attr: struct bin_attribute for this file
1226  * @buf: user input
1227  * @off: file offset
1228  * @count: number of byte in input
1229  *
1230  * writing anything except 0 enables it
1231  */
1232 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1233                              struct bin_attribute *bin_attr, char *buf,
1234                              loff_t off, size_t count)
1235 {
1236         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1237 
1238         if ((off ==  0) && (*buf == '0') && (count == 2))
1239                 pdev->rom_attr_enabled = 0;
1240         else
1241                 pdev->rom_attr_enabled = 1;
1242 
1243         return count;
1244 }
1245 
1246 /**
1247  * pci_read_rom - read a PCI ROM
1248  * @filp: sysfs file
1249  * @kobj: kernel object handle
1250  * @bin_attr: struct bin_attribute for this file
1251  * @buf: where to put the data we read from the ROM
1252  * @off: file offset
1253  * @count: number of bytes to read
1254  *
1255  * Put @count bytes starting at @off into @buf from the ROM in the PCI
1256  * device corresponding to @kobj.
1257  */
1258 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1259                             struct bin_attribute *bin_attr, char *buf,
1260                             loff_t off, size_t count)
1261 {
1262         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1263         void __iomem *rom;
1264         size_t size;
1265 
1266         if (!pdev->rom_attr_enabled)
1267                 return -EINVAL;
1268 
1269         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1270         if (!rom || !size)
1271                 return -EIO;
1272 
1273         if (off >= size)
1274                 count = 0;
1275         else {
1276                 if (off + count > size)
1277                         count = size - off;
1278 
1279                 memcpy_fromio(buf, rom + off, count);
1280         }
1281         pci_unmap_rom(pdev, rom);
1282 
1283         return count;
1284 }
1285 
1286 static const struct bin_attribute pci_config_attr = {
1287         .attr = {
1288                 .name = "config",
1289                 .mode = 0644,
1290         },
1291         .size = PCI_CFG_SPACE_SIZE,
1292         .read = pci_read_config,
1293         .write = pci_write_config,
1294 };
1295 
1296 static const struct bin_attribute pcie_config_attr = {
1297         .attr = {
1298                 .name = "config",
1299                 .mode = 0644,
1300         },
1301         .size = PCI_CFG_SPACE_EXP_SIZE,
1302         .read = pci_read_config,
1303         .write = pci_write_config,
1304 };
1305 
1306 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1307                            const char *buf, size_t count)
1308 {
1309         struct pci_dev *pdev = to_pci_dev(dev);
1310         unsigned long val;
1311         ssize_t result = kstrtoul(buf, 0, &val);
1312 
1313         if (result < 0)
1314                 return result;
1315 
1316         if (val != 1)
1317                 return -EINVAL;
1318 
1319         pm_runtime_get_sync(dev);
1320         result = pci_reset_function(pdev);
1321         pm_runtime_put(dev);
1322         if (result < 0)
1323                 return result;
1324 
1325         return count;
1326 }
1327 
1328 static DEVICE_ATTR(reset, 0200, NULL, reset_store);
1329 
1330 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1331 {
1332         int retval;
1333 
1334         pcie_vpd_create_sysfs_dev_files(dev);
1335         pcie_aspm_create_sysfs_dev_files(dev);
1336 
1337         if (dev->reset_fn) {
1338                 retval = device_create_file(&dev->dev, &dev_attr_reset);
1339                 if (retval)
1340                         goto error;
1341         }
1342         return 0;
1343 
1344 error:
1345         pcie_aspm_remove_sysfs_dev_files(dev);
1346         pcie_vpd_remove_sysfs_dev_files(dev);
1347         return retval;
1348 }
1349 
1350 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1351 {
1352         int retval;
1353         int rom_size;
1354         struct bin_attribute *attr;
1355 
1356         if (!sysfs_initialized)
1357                 return -EACCES;
1358 
1359         if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1360                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1361         else
1362                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1363         if (retval)
1364                 goto err;
1365 
1366         retval = pci_create_resource_files(pdev);
1367         if (retval)
1368                 goto err_config_file;
1369 
1370         /* If the device has a ROM, try to expose it in sysfs. */
1371         rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1372         if (rom_size) {
1373                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1374                 if (!attr) {
1375                         retval = -ENOMEM;
1376                         goto err_resource_files;
1377                 }
1378                 sysfs_bin_attr_init(attr);
1379                 attr->size = rom_size;
1380                 attr->attr.name = "rom";
1381                 attr->attr.mode = 0600;
1382                 attr->read = pci_read_rom;
1383                 attr->write = pci_write_rom;
1384                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1385                 if (retval) {
1386                         kfree(attr);
1387                         goto err_resource_files;
1388                 }
1389                 pdev->rom_attr = attr;
1390         }
1391 
1392         /* add sysfs entries for various capabilities */
1393         retval = pci_create_capabilities_sysfs(pdev);
1394         if (retval)
1395                 goto err_rom_file;
1396 
1397         pci_create_firmware_label_files(pdev);
1398 
1399         return 0;
1400 
1401 err_rom_file:
1402         if (pdev->rom_attr) {
1403                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1404                 kfree(pdev->rom_attr);
1405                 pdev->rom_attr = NULL;
1406         }
1407 err_resource_files:
1408         pci_remove_resource_files(pdev);
1409 err_config_file:
1410         if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1411                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1412         else
1413                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1414 err:
1415         return retval;
1416 }
1417 
1418 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1419 {
1420         pcie_vpd_remove_sysfs_dev_files(dev);
1421         pcie_aspm_remove_sysfs_dev_files(dev);
1422         if (dev->reset_fn) {
1423                 device_remove_file(&dev->dev, &dev_attr_reset);
1424                 dev->reset_fn = 0;
1425         }
1426 }
1427 
1428 /**
1429  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1430  * @pdev: device whose entries we should free
1431  *
1432  * Cleanup when @pdev is removed from sysfs.
1433  */
1434 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1435 {
1436         if (!sysfs_initialized)
1437                 return;
1438 
1439         pci_remove_capabilities_sysfs(pdev);
1440 
1441         if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1442                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1443         else
1444                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1445 
1446         pci_remove_resource_files(pdev);
1447 
1448         if (pdev->rom_attr) {
1449                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1450                 kfree(pdev->rom_attr);
1451                 pdev->rom_attr = NULL;
1452         }
1453 
1454         pci_remove_firmware_label_files(pdev);
1455 }
1456 
1457 static int __init pci_sysfs_init(void)
1458 {
1459         struct pci_dev *pdev = NULL;
1460         int retval;
1461 
1462         sysfs_initialized = 1;
1463         for_each_pci_dev(pdev) {
1464                 retval = pci_create_sysfs_dev_files(pdev);
1465                 if (retval) {
1466                         pci_dev_put(pdev);
1467                         return retval;
1468                 }
1469         }
1470 
1471         return 0;
1472 }
1473 late_initcall(pci_sysfs_init);
1474 
1475 static struct attribute *pci_dev_dev_attrs[] = {
1476         &dev_attr_boot_vga.attr,
1477         NULL,
1478 };
1479 
1480 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1481                                          struct attribute *a, int n)
1482 {
1483         struct device *dev = kobj_to_dev(kobj);
1484         struct pci_dev *pdev = to_pci_dev(dev);
1485 
1486         if (a == &dev_attr_boot_vga.attr)
1487                 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1488                         return 0;
1489 
1490         return a->mode;
1491 }
1492 
1493 static struct attribute *pci_dev_hp_attrs[] = {
1494         &dev_attr_remove.attr,
1495         &dev_attr_dev_rescan.attr,
1496         NULL,
1497 };
1498 
1499 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1500                                             struct attribute *a, int n)
1501 {
1502         struct device *dev = kobj_to_dev(kobj);
1503         struct pci_dev *pdev = to_pci_dev(dev);
1504 
1505         if (pdev->is_virtfn)
1506                 return 0;
1507 
1508         return a->mode;
1509 }
1510 
1511 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1512                                             struct attribute *a, int n)
1513 {
1514         struct device *dev = kobj_to_dev(kobj);
1515         struct pci_dev *pdev = to_pci_dev(dev);
1516 
1517         if (pci_is_bridge(pdev))
1518                 return a->mode;
1519 
1520         return 0;
1521 }
1522 
1523 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1524                                           struct attribute *a, int n)
1525 {
1526         struct device *dev = kobj_to_dev(kobj);
1527         struct pci_dev *pdev = to_pci_dev(dev);
1528 
1529         if (pci_is_pcie(pdev))
1530                 return a->mode;
1531 
1532         return 0;
1533 }
1534 
1535 static const struct attribute_group pci_dev_group = {
1536         .attrs = pci_dev_attrs,
1537 };
1538 
1539 const struct attribute_group *pci_dev_groups[] = {
1540         &pci_dev_group,
1541         NULL,
1542 };
1543 
1544 static const struct attribute_group pci_bridge_group = {
1545         .attrs = pci_bridge_attrs,
1546 };
1547 
1548 const struct attribute_group *pci_bridge_groups[] = {
1549         &pci_bridge_group,
1550         NULL,
1551 };
1552 
1553 static const struct attribute_group pcie_dev_group = {
1554         .attrs = pcie_dev_attrs,
1555 };
1556 
1557 const struct attribute_group *pcie_dev_groups[] = {
1558         &pcie_dev_group,
1559         NULL,
1560 };
1561 
1562 static const struct attribute_group pci_dev_hp_attr_group = {
1563         .attrs = pci_dev_hp_attrs,
1564         .is_visible = pci_dev_hp_attrs_are_visible,
1565 };
1566 
1567 static const struct attribute_group pci_dev_attr_group = {
1568         .attrs = pci_dev_dev_attrs,
1569         .is_visible = pci_dev_attrs_are_visible,
1570 };
1571 
1572 static const struct attribute_group pci_bridge_attr_group = {
1573         .attrs = pci_bridge_attrs,
1574         .is_visible = pci_bridge_attrs_are_visible,
1575 };
1576 
1577 static const struct attribute_group pcie_dev_attr_group = {
1578         .attrs = pcie_dev_attrs,
1579         .is_visible = pcie_dev_attrs_are_visible,
1580 };
1581 
1582 static const struct attribute_group *pci_dev_attr_groups[] = {
1583         &pci_dev_attr_group,
1584         &pci_dev_hp_attr_group,
1585 #ifdef CONFIG_PCI_IOV
1586         &sriov_dev_attr_group,
1587 #endif
1588         &pci_bridge_attr_group,
1589         &pcie_dev_attr_group,
1590 #ifdef CONFIG_PCIEAER
1591         &aer_stats_attr_group,
1592 #endif
1593         NULL,
1594 };
1595 
1596 const struct device_type pci_dev_type = {
1597         .groups = pci_dev_attr_groups,
1598 };
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/pci/pci-sysfs.c

DEFINITIONS
