linux/drivers/pci/pci-sysfs.c
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   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 "pci.h"
  33
  34static int sysfs_initialized;   /* = 0 */
  35
  36/* show configuration fields */
  37#define pci_config_attr(field, format_string)                           \
  38static ssize_t                                                          \
  39field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  40{                                                                       \
  41        struct pci_dev *pdev;                                           \
  42                                                                        \
  43        pdev = to_pci_dev (dev);                                        \
  44        return sprintf (buf, format_string, pdev->field);               \
  45}
  46
  47pci_config_attr(vendor, "0x%04x\n");
  48pci_config_attr(device, "0x%04x\n");
  49pci_config_attr(subsystem_vendor, "0x%04x\n");
  50pci_config_attr(subsystem_device, "0x%04x\n");
  51pci_config_attr(class, "0x%06x\n");
  52pci_config_attr(irq, "%u\n");
  53
  54static 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
  62static 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 (strict_strtoul(buf, 0, &val) < 0)
  70                return -EINVAL;
  71
  72        pdev->broken_parity_status = !!val;
  73
  74        return count;
  75}
  76
  77static ssize_t local_cpus_show(struct device *dev,
  78                        struct device_attribute *attr, char *buf)
  79{               
  80        const struct cpumask *mask;
  81        int len;
  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        len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  90        buf[len++] = '\n';
  91        buf[len] = '\0';
  92        return len;
  93}
  94
  95
  96static ssize_t local_cpulist_show(struct device *dev,
  97                        struct device_attribute *attr, char *buf)
  98{
  99        const struct cpumask *mask;
 100        int len;
 101
 102#ifdef CONFIG_NUMA
 103        mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
 104                                          cpumask_of_node(dev_to_node(dev));
 105#else
 106        mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
 107#endif
 108        len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
 109        buf[len++] = '\n';
 110        buf[len] = '\0';
 111        return len;
 112}
 113
 114/*
 115 * PCI Bus Class Devices
 116 */
 117static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
 118                                        int type,
 119                                        struct device_attribute *attr,
 120                                        char *buf)
 121{
 122        int ret;
 123        const struct cpumask *cpumask;
 124
 125        cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 126        ret = type ?
 127                cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
 128                cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
 129        buf[ret++] = '\n';
 130        buf[ret] = '\0';
 131        return ret;
 132}
 133
 134static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
 135                                        struct device_attribute *attr,
 136                                        char *buf)
 137{
 138        return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
 139}
 140
 141static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
 142                                        struct device_attribute *attr,
 143                                        char *buf)
 144{
 145        return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
 146}
 147
 148/* show resources */
 149static ssize_t
 150resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 151{
 152        struct pci_dev * pci_dev = to_pci_dev(dev);
 153        char * str = buf;
 154        int i;
 155        int max;
 156        resource_size_t start, end;
 157
 158        if (pci_dev->subordinate)
 159                max = DEVICE_COUNT_RESOURCE;
 160        else
 161                max = PCI_BRIDGE_RESOURCES;
 162
 163        for (i = 0; i < max; i++) {
 164                struct resource *res =  &pci_dev->resource[i];
 165                pci_resource_to_user(pci_dev, i, res, &start, &end);
 166                str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 167                               (unsigned long long)start,
 168                               (unsigned long long)end,
 169                               (unsigned long long)res->flags);
 170        }
 171        return (str - buf);
 172}
 173
 174static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 175{
 176        struct pci_dev *pci_dev = to_pci_dev(dev);
 177
 178        return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 179                       pci_dev->vendor, pci_dev->device,
 180                       pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 181                       (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 182                       (u8)(pci_dev->class));
 183}
 184
 185static ssize_t is_enabled_store(struct device *dev,
 186                                struct device_attribute *attr, const char *buf,
 187                                size_t count)
 188{
 189        struct pci_dev *pdev = to_pci_dev(dev);
 190        unsigned long val;
 191        ssize_t result = strict_strtoul(buf, 0, &val);
 192
 193        if (result < 0)
 194                return result;
 195
 196        /* this can crash the machine when done on the "wrong" device */
 197        if (!capable(CAP_SYS_ADMIN))
 198                return -EPERM;
 199
 200        if (!val) {
 201                if (pci_is_enabled(pdev))
 202                        pci_disable_device(pdev);
 203                else
 204                        result = -EIO;
 205        } else
 206                result = pci_enable_device(pdev);
 207
 208        return result < 0 ? result : count;
 209}
 210
 211static ssize_t is_enabled_show(struct device *dev,
 212                               struct device_attribute *attr, char *buf)
 213{
 214        struct pci_dev *pdev;
 215
 216        pdev = to_pci_dev (dev);
 217        return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 218}
 219
 220#ifdef CONFIG_NUMA
 221static ssize_t
 222numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 223{
 224        return sprintf (buf, "%d\n", dev->numa_node);
 225}
 226#endif
 227
 228static ssize_t
 229dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
 230{
 231        struct pci_dev *pdev = to_pci_dev(dev);
 232
 233        return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
 234}
 235
 236static ssize_t
 237consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
 238                                 char *buf)
 239{
 240        return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
 241}
 242
 243static ssize_t
 244msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 245{
 246        struct pci_dev *pdev = to_pci_dev(dev);
 247
 248        if (!pdev->subordinate)
 249                return 0;
 250
 251        return sprintf (buf, "%u\n",
 252                        !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 253}
 254
 255static ssize_t
 256msi_bus_store(struct device *dev, struct device_attribute *attr,
 257              const char *buf, size_t count)
 258{
 259        struct pci_dev *pdev = to_pci_dev(dev);
 260        unsigned long val;
 261
 262        if (strict_strtoul(buf, 0, &val) < 0)
 263                return -EINVAL;
 264
 265        /* bad things may happen if the no_msi flag is changed
 266         * while some drivers are loaded */
 267        if (!capable(CAP_SYS_ADMIN))
 268                return -EPERM;
 269
 270        /* Maybe pci devices without subordinate busses shouldn't even have this
 271         * attribute in the first place?  */
 272        if (!pdev->subordinate)
 273                return count;
 274
 275        /* Is the flag going to change, or keep the value it already had? */
 276        if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 277            !!val) {
 278                pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 279
 280                dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 281                         " bad things could happen\n", val ? "" : " not");
 282        }
 283
 284        return count;
 285}
 286
 287static DEFINE_MUTEX(pci_remove_rescan_mutex);
 288static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 289                                size_t count)
 290{
 291        unsigned long val;
 292        struct pci_bus *b = NULL;
 293
 294        if (strict_strtoul(buf, 0, &val) < 0)
 295                return -EINVAL;
 296
 297        if (val) {
 298                mutex_lock(&pci_remove_rescan_mutex);
 299                while ((b = pci_find_next_bus(b)) != NULL)
 300                        pci_rescan_bus(b);
 301                mutex_unlock(&pci_remove_rescan_mutex);
 302        }
 303        return count;
 304}
 305
 306struct bus_attribute pci_bus_attrs[] = {
 307        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
 308        __ATTR_NULL
 309};
 310
 311static ssize_t
 312dev_rescan_store(struct device *dev, struct device_attribute *attr,
 313                 const char *buf, size_t count)
 314{
 315        unsigned long val;
 316        struct pci_dev *pdev = to_pci_dev(dev);
 317
 318        if (strict_strtoul(buf, 0, &val) < 0)
 319                return -EINVAL;
 320
 321        if (val) {
 322                mutex_lock(&pci_remove_rescan_mutex);
 323                pci_rescan_bus(pdev->bus);
 324                mutex_unlock(&pci_remove_rescan_mutex);
 325        }
 326        return count;
 327}
 328
 329static void remove_callback(struct device *dev)
 330{
 331        struct pci_dev *pdev = to_pci_dev(dev);
 332
 333        mutex_lock(&pci_remove_rescan_mutex);
 334        pci_stop_and_remove_bus_device(pdev);
 335        mutex_unlock(&pci_remove_rescan_mutex);
 336}
 337
 338static ssize_t
 339remove_store(struct device *dev, struct device_attribute *dummy,
 340             const char *buf, size_t count)
 341{
 342        int ret = 0;
 343        unsigned long val;
 344
 345        if (strict_strtoul(buf, 0, &val) < 0)
 346                return -EINVAL;
 347
 348        /* An attribute cannot be unregistered by one of its own methods,
 349         * so we have to use this roundabout approach.
 350         */
 351        if (val)
 352                ret = device_schedule_callback(dev, remove_callback);
 353        if (ret)
 354                count = ret;
 355        return count;
 356}
 357
 358static ssize_t
 359dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 360                 const char *buf, size_t count)
 361{
 362        unsigned long val;
 363        struct pci_bus *bus = to_pci_bus(dev);
 364
 365        if (strict_strtoul(buf, 0, &val) < 0)
 366                return -EINVAL;
 367
 368        if (val) {
 369                mutex_lock(&pci_remove_rescan_mutex);
 370                if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
 371                        pci_rescan_bus_bridge_resize(bus->self);
 372                else
 373                        pci_rescan_bus(bus);
 374                mutex_unlock(&pci_remove_rescan_mutex);
 375        }
 376        return count;
 377}
 378
 379#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 380static ssize_t d3cold_allowed_store(struct device *dev,
 381                                    struct device_attribute *attr,
 382                                    const char *buf, size_t count)
 383{
 384        struct pci_dev *pdev = to_pci_dev(dev);
 385        unsigned long val;
 386
 387        if (strict_strtoul(buf, 0, &val) < 0)
 388                return -EINVAL;
 389
 390        pdev->d3cold_allowed = !!val;
 391        pm_runtime_resume(dev);
 392
 393        return count;
 394}
 395
 396static ssize_t d3cold_allowed_show(struct device *dev,
 397                                   struct device_attribute *attr, char *buf)
 398{
 399        struct pci_dev *pdev = to_pci_dev(dev);
 400        return sprintf (buf, "%u\n", pdev->d3cold_allowed);
 401}
 402#endif
 403
 404#ifdef CONFIG_PCI_IOV
 405static ssize_t sriov_totalvfs_show(struct device *dev,
 406                                   struct device_attribute *attr,
 407                                   char *buf)
 408{
 409        struct pci_dev *pdev = to_pci_dev(dev);
 410
 411        return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
 412}
 413
 414
 415static ssize_t sriov_numvfs_show(struct device *dev,
 416                                 struct device_attribute *attr,
 417                                 char *buf)
 418{
 419        struct pci_dev *pdev = to_pci_dev(dev);
 420
 421        return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
 422}
 423
 424/*
 425 * num_vfs > 0; number of VFs to enable
 426 * num_vfs = 0; disable all VFs
 427 *
 428 * Note: SRIOV spec doesn't allow partial VF
 429 *       disable, so it's all or none.
 430 */
 431static ssize_t sriov_numvfs_store(struct device *dev,
 432                                  struct device_attribute *attr,
 433                                  const char *buf, size_t count)
 434{
 435        struct pci_dev *pdev = to_pci_dev(dev);
 436        int ret;
 437        u16 num_vfs;
 438
 439        ret = kstrtou16(buf, 0, &num_vfs);
 440        if (ret < 0)
 441                return ret;
 442
 443        if (num_vfs > pci_sriov_get_totalvfs(pdev))
 444                return -ERANGE;
 445
 446        if (num_vfs == pdev->sriov->num_VFs)
 447                return count;           /* no change */
 448
 449        /* is PF driver loaded w/callback */
 450        if (!pdev->driver || !pdev->driver->sriov_configure) {
 451                dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
 452                return -ENOSYS;
 453        }
 454
 455        if (num_vfs == 0) {
 456                /* disable VFs */
 457                ret = pdev->driver->sriov_configure(pdev, 0);
 458                if (ret < 0)
 459                        return ret;
 460                return count;
 461        }
 462
 463        /* enable VFs */
 464        if (pdev->sriov->num_VFs) {
 465                dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
 466                         pdev->sriov->num_VFs, num_vfs);
 467                return -EBUSY;
 468        }
 469
 470        ret = pdev->driver->sriov_configure(pdev, num_vfs);
 471        if (ret < 0)
 472                return ret;
 473
 474        if (ret != num_vfs)
 475                dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
 476                         num_vfs, ret);
 477
 478        return count;
 479}
 480
 481static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
 482static struct device_attribute sriov_numvfs_attr =
 483                __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
 484                       sriov_numvfs_show, sriov_numvfs_store);
 485#endif /* CONFIG_PCI_IOV */
 486
 487struct device_attribute pci_dev_attrs[] = {
 488        __ATTR_RO(resource),
 489        __ATTR_RO(vendor),
 490        __ATTR_RO(device),
 491        __ATTR_RO(subsystem_vendor),
 492        __ATTR_RO(subsystem_device),
 493        __ATTR_RO(class),
 494        __ATTR_RO(irq),
 495        __ATTR_RO(local_cpus),
 496        __ATTR_RO(local_cpulist),
 497        __ATTR_RO(modalias),
 498#ifdef CONFIG_NUMA
 499        __ATTR_RO(numa_node),
 500#endif
 501        __ATTR_RO(dma_mask_bits),
 502        __ATTR_RO(consistent_dma_mask_bits),
 503        __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 504        __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 505                broken_parity_status_show,broken_parity_status_store),
 506        __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 507        __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
 508        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
 509#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
 510        __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
 511#endif
 512        __ATTR_NULL,
 513};
 514
 515struct device_attribute pcibus_dev_attrs[] = {
 516        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
 517        __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
 518        __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
 519        __ATTR_NULL,
 520};
 521
 522static ssize_t
 523boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 524{
 525        struct pci_dev *pdev = to_pci_dev(dev);
 526        struct pci_dev *vga_dev = vga_default_device();
 527
 528        if (vga_dev)
 529                return sprintf(buf, "%u\n", (pdev == vga_dev));
 530
 531        return sprintf(buf, "%u\n",
 532                !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 533                   IORESOURCE_ROM_SHADOW));
 534}
 535struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 536
 537static ssize_t
 538pci_read_config(struct file *filp, struct kobject *kobj,
 539                struct bin_attribute *bin_attr,
 540                char *buf, loff_t off, size_t count)
 541{
 542        struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 543        unsigned int size = 64;
 544        loff_t init_off = off;
 545        u8 *data = (u8*) buf;
 546
 547        /* Several chips lock up trying to read undefined config space */
 548        if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
 549                size = dev->cfg_size;
 550        } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 551                size = 128;
 552        }
 553
 554        if (off > size)
 555                return 0;
 556        if (off + count > size) {
 557                size -= off;
 558                count = size;
 559        } else {
 560                size = count;
 561        }
 562
 563        pci_config_pm_runtime_get(dev);
 564
 565        if ((off & 1) && size) {
 566                u8 val;
 567                pci_user_read_config_byte(dev, off, &val);
 568                data[off - init_off] = val;
 569                off++;
 570                size--;
 571        }
 572
 573        if ((off & 3) && size > 2) {
 574                u16 val;
 575                pci_user_read_config_word(dev, off, &val);
 576                data[off - init_off] = val & 0xff;
 577                data[off - init_off + 1] = (val >> 8) & 0xff;
 578                off += 2;
 579                size -= 2;
 580        }
 581
 582        while (size > 3) {
 583                u32 val;
 584                pci_user_read_config_dword(dev, off, &val);
 585                data[off - init_off] = val & 0xff;
 586                data[off - init_off + 1] = (val >> 8) & 0xff;
 587                data[off - init_off + 2] = (val >> 16) & 0xff;
 588                data[off - init_off + 3] = (val >> 24) & 0xff;
 589                off += 4;
 590                size -= 4;
 591        }
 592
 593        if (size >= 2) {
 594                u16 val;
 595                pci_user_read_config_word(dev, off, &val);
 596                data[off - init_off] = val & 0xff;
 597                data[off - init_off + 1] = (val >> 8) & 0xff;
 598                off += 2;
 599                size -= 2;
 600        }
 601
 602        if (size > 0) {
 603                u8 val;
 604                pci_user_read_config_byte(dev, off, &val);
 605                data[off - init_off] = val;
 606                off++;
 607                --size;
 608        }
 609
 610        pci_config_pm_runtime_put(dev);
 611
 612        return count;
 613}
 614
 615static ssize_t
 616pci_write_config(struct file* filp, struct kobject *kobj,
 617                 struct bin_attribute *bin_attr,
 618                 char *buf, loff_t off, size_t count)
 619{
 620        struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 621        unsigned int size = count;
 622        loff_t init_off = off;
 623        u8 *data = (u8*) buf;
 624
 625        if (off > dev->cfg_size)
 626                return 0;
 627        if (off + count > dev->cfg_size) {
 628                size = dev->cfg_size - off;
 629                count = size;
 630        }
 631        
 632        pci_config_pm_runtime_get(dev);
 633
 634        if ((off & 1) && size) {
 635                pci_user_write_config_byte(dev, off, data[off - init_off]);
 636                off++;
 637                size--;
 638        }
 639        
 640        if ((off & 3) && size > 2) {
 641                u16 val = data[off - init_off];
 642                val |= (u16) data[off - init_off + 1] << 8;
 643                pci_user_write_config_word(dev, off, val);
 644                off += 2;
 645                size -= 2;
 646        }
 647
 648        while (size > 3) {
 649                u32 val = data[off - init_off];
 650                val |= (u32) data[off - init_off + 1] << 8;
 651                val |= (u32) data[off - init_off + 2] << 16;
 652                val |= (u32) data[off - init_off + 3] << 24;
 653                pci_user_write_config_dword(dev, off, val);
 654                off += 4;
 655                size -= 4;
 656        }
 657        
 658        if (size >= 2) {
 659                u16 val = data[off - init_off];
 660                val |= (u16) data[off - init_off + 1] << 8;
 661                pci_user_write_config_word(dev, off, val);
 662                off += 2;
 663                size -= 2;
 664        }
 665
 666        if (size) {
 667                pci_user_write_config_byte(dev, off, data[off - init_off]);
 668                off++;
 669                --size;
 670        }
 671
 672        pci_config_pm_runtime_put(dev);
 673
 674        return count;
 675}
 676
 677static ssize_t
 678read_vpd_attr(struct file *filp, struct kobject *kobj,
 679              struct bin_attribute *bin_attr,
 680              char *buf, loff_t off, size_t count)
 681{
 682        struct pci_dev *dev =
 683                to_pci_dev(container_of(kobj, struct device, kobj));
 684
 685        if (off > bin_attr->size)
 686                count = 0;
 687        else if (count > bin_attr->size - off)
 688                count = bin_attr->size - off;
 689
 690        return pci_read_vpd(dev, off, count, buf);
 691}
 692
 693static ssize_t
 694write_vpd_attr(struct file *filp, struct kobject *kobj,
 695               struct bin_attribute *bin_attr,
 696               char *buf, loff_t off, size_t count)
 697{
 698        struct pci_dev *dev =
 699                to_pci_dev(container_of(kobj, struct device, kobj));
 700
 701        if (off > bin_attr->size)
 702                count = 0;
 703        else if (count > bin_attr->size - off)
 704                count = bin_attr->size - off;
 705
 706        return pci_write_vpd(dev, off, count, buf);
 707}
 708
 709#ifdef HAVE_PCI_LEGACY
 710/**
 711 * pci_read_legacy_io - read byte(s) from legacy I/O port space
 712 * @filp: open sysfs file
 713 * @kobj: kobject corresponding to file to read from
 714 * @bin_attr: struct bin_attribute for this file
 715 * @buf: buffer to store results
 716 * @off: offset into legacy I/O port space
 717 * @count: number of bytes to read
 718 *
 719 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 720 * callback routine (pci_legacy_read).
 721 */
 722static ssize_t
 723pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 724                   struct bin_attribute *bin_attr,
 725                   char *buf, loff_t off, size_t count)
 726{
 727        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 728                                                      struct device,
 729                                                      kobj));
 730
 731        /* Only support 1, 2 or 4 byte accesses */
 732        if (count != 1 && count != 2 && count != 4)
 733                return -EINVAL;
 734
 735        return pci_legacy_read(bus, off, (u32 *)buf, count);
 736}
 737
 738/**
 739 * pci_write_legacy_io - write byte(s) to legacy I/O port space
 740 * @filp: open sysfs file
 741 * @kobj: kobject corresponding to file to read from
 742 * @bin_attr: struct bin_attribute for this file
 743 * @buf: buffer containing value to be written
 744 * @off: offset into legacy I/O port space
 745 * @count: number of bytes to write
 746 *
 747 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 748 * callback routine (pci_legacy_write).
 749 */
 750static ssize_t
 751pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 752                    struct bin_attribute *bin_attr,
 753                    char *buf, loff_t off, size_t count)
 754{
 755        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 756                                                      struct device,
 757                                                      kobj));
 758        /* Only support 1, 2 or 4 byte accesses */
 759        if (count != 1 && count != 2 && count != 4)
 760                return -EINVAL;
 761
 762        return pci_legacy_write(bus, off, *(u32 *)buf, count);
 763}
 764
 765/**
 766 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 767 * @filp: open sysfs file
 768 * @kobj: kobject corresponding to device to be mapped
 769 * @attr: struct bin_attribute for this file
 770 * @vma: struct vm_area_struct passed to mmap
 771 *
 772 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 773 * legacy memory space (first meg of bus space) into application virtual
 774 * memory space.
 775 */
 776static int
 777pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 778                    struct bin_attribute *attr,
 779                    struct vm_area_struct *vma)
 780{
 781        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 782                                                      struct device,
 783                                                      kobj));
 784
 785        return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 786}
 787
 788/**
 789 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 790 * @filp: open sysfs file
 791 * @kobj: kobject corresponding to device to be mapped
 792 * @attr: struct bin_attribute for this file
 793 * @vma: struct vm_area_struct passed to mmap
 794 *
 795 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 796 * legacy IO space (first meg of bus space) into application virtual
 797 * memory space. Returns -ENOSYS if the operation isn't supported
 798 */
 799static int
 800pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 801                   struct bin_attribute *attr,
 802                   struct vm_area_struct *vma)
 803{
 804        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 805                                                      struct device,
 806                                                      kobj));
 807
 808        return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 809}
 810
 811/**
 812 * pci_adjust_legacy_attr - adjustment of legacy file attributes
 813 * @b: bus to create files under
 814 * @mmap_type: I/O port or memory
 815 *
 816 * Stub implementation. Can be overridden by arch if necessary.
 817 */
 818void __weak
 819pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 820{
 821        return;
 822}
 823
 824/**
 825 * pci_create_legacy_files - create legacy I/O port and memory files
 826 * @b: bus to create files under
 827 *
 828 * Some platforms allow access to legacy I/O port and ISA memory space on
 829 * a per-bus basis.  This routine creates the files and ties them into
 830 * their associated read, write and mmap files from pci-sysfs.c
 831 *
 832 * On error unwind, but don't propagate the error to the caller
 833 * as it is ok to set up the PCI bus without these files.
 834 */
 835void pci_create_legacy_files(struct pci_bus *b)
 836{
 837        int error;
 838
 839        b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 840                               GFP_ATOMIC);
 841        if (!b->legacy_io)
 842                goto kzalloc_err;
 843
 844        sysfs_bin_attr_init(b->legacy_io);
 845        b->legacy_io->attr.name = "legacy_io";
 846        b->legacy_io->size = 0xffff;
 847        b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 848        b->legacy_io->read = pci_read_legacy_io;
 849        b->legacy_io->write = pci_write_legacy_io;
 850        b->legacy_io->mmap = pci_mmap_legacy_io;
 851        pci_adjust_legacy_attr(b, pci_mmap_io);
 852        error = device_create_bin_file(&b->dev, b->legacy_io);
 853        if (error)
 854                goto legacy_io_err;
 855
 856        /* Allocated above after the legacy_io struct */
 857        b->legacy_mem = b->legacy_io + 1;
 858        sysfs_bin_attr_init(b->legacy_mem);
 859        b->legacy_mem->attr.name = "legacy_mem";
 860        b->legacy_mem->size = 1024*1024;
 861        b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 862        b->legacy_mem->mmap = pci_mmap_legacy_mem;
 863        pci_adjust_legacy_attr(b, pci_mmap_mem);
 864        error = device_create_bin_file(&b->dev, b->legacy_mem);
 865        if (error)
 866                goto legacy_mem_err;
 867
 868        return;
 869
 870legacy_mem_err:
 871        device_remove_bin_file(&b->dev, b->legacy_io);
 872legacy_io_err:
 873        kfree(b->legacy_io);
 874        b->legacy_io = NULL;
 875kzalloc_err:
 876        printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 877               "and ISA memory resources to sysfs\n");
 878        return;
 879}
 880
 881void pci_remove_legacy_files(struct pci_bus *b)
 882{
 883        if (b->legacy_io) {
 884                device_remove_bin_file(&b->dev, b->legacy_io);
 885                device_remove_bin_file(&b->dev, b->legacy_mem);
 886                kfree(b->legacy_io); /* both are allocated here */
 887        }
 888}
 889#endif /* HAVE_PCI_LEGACY */
 890
 891#ifdef HAVE_PCI_MMAP
 892
 893int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 894                  enum pci_mmap_api mmap_api)
 895{
 896        unsigned long nr, start, size, pci_start;
 897
 898        if (pci_resource_len(pdev, resno) == 0)
 899                return 0;
 900        nr = vma_pages(vma);
 901        start = vma->vm_pgoff;
 902        size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 903        pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 904                        pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 905        if (start >= pci_start && start < pci_start + size &&
 906                        start + nr <= pci_start + size)
 907                return 1;
 908        return 0;
 909}
 910
 911/**
 912 * pci_mmap_resource - map a PCI resource into user memory space
 913 * @kobj: kobject for mapping
 914 * @attr: struct bin_attribute for the file being mapped
 915 * @vma: struct vm_area_struct passed into the mmap
 916 * @write_combine: 1 for write_combine mapping
 917 *
 918 * Use the regular PCI mapping routines to map a PCI resource into userspace.
 919 */
 920static int
 921pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 922                  struct vm_area_struct *vma, int write_combine)
 923{
 924        struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 925                                                       struct device, kobj));
 926        struct resource *res = attr->private;
 927        enum pci_mmap_state mmap_type;
 928        resource_size_t start, end;
 929        int i;
 930
 931        for (i = 0; i < PCI_ROM_RESOURCE; i++)
 932                if (res == &pdev->resource[i])
 933                        break;
 934        if (i >= PCI_ROM_RESOURCE)
 935                return -ENODEV;
 936
 937        if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
 938                WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
 939                        "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
 940                        current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
 941                        pci_name(pdev), i,
 942                        (u64)pci_resource_start(pdev, i),
 943                        (u64)pci_resource_len(pdev, i));
 944                return -EINVAL;
 945        }
 946
 947        /* pci_mmap_page_range() expects the same kind of entry as coming
 948         * from /proc/bus/pci/ which is a "user visible" value. If this is
 949         * different from the resource itself, arch will do necessary fixup.
 950         */
 951        pci_resource_to_user(pdev, i, res, &start, &end);
 952        vma->vm_pgoff += start >> PAGE_SHIFT;
 953        mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 954
 955        if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 956                return -EINVAL;
 957
 958        return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 959}
 960
 961static int
 962pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
 963                     struct bin_attribute *attr,
 964                     struct vm_area_struct *vma)
 965{
 966        return pci_mmap_resource(kobj, attr, vma, 0);
 967}
 968
 969static int
 970pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
 971                     struct bin_attribute *attr,
 972                     struct vm_area_struct *vma)
 973{
 974        return pci_mmap_resource(kobj, attr, vma, 1);
 975}
 976
 977static ssize_t
 978pci_resource_io(struct file *filp, struct kobject *kobj,
 979                struct bin_attribute *attr, char *buf,
 980                loff_t off, size_t count, bool write)
 981{
 982        struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 983                                                       struct device, kobj));
 984        struct resource *res = attr->private;
 985        unsigned long port = off;
 986        int i;
 987
 988        for (i = 0; i < PCI_ROM_RESOURCE; i++)
 989                if (res == &pdev->resource[i])
 990                        break;
 991        if (i >= PCI_ROM_RESOURCE)
 992                return -ENODEV;
 993
 994        port += pci_resource_start(pdev, i);
 995
 996        if (port > pci_resource_end(pdev, i))
 997                return 0;
 998
 999        if (port + count - 1 > pci_resource_end(pdev, i))
1000                return -EINVAL;
1001
1002        switch (count) {
1003        case 1:
1004                if (write)
1005                        outb(*(u8 *)buf, port);
1006                else
1007                        *(u8 *)buf = inb(port);
1008                return 1;
1009        case 2:
1010                if (write)
1011                        outw(*(u16 *)buf, port);
1012                else
1013                        *(u16 *)buf = inw(port);
1014                return 2;
1015        case 4:
1016                if (write)
1017                        outl(*(u32 *)buf, port);
1018                else
1019                        *(u32 *)buf = inl(port);
1020                return 4;
1021        }
1022        return -EINVAL;
1023}
1024
1025static ssize_t
1026pci_read_resource_io(struct file *filp, struct kobject *kobj,
1027                     struct bin_attribute *attr, char *buf,
1028                     loff_t off, size_t count)
1029{
1030        return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1031}
1032
1033static ssize_t
1034pci_write_resource_io(struct file *filp, struct kobject *kobj,
1035                      struct bin_attribute *attr, char *buf,
1036                      loff_t off, size_t count)
1037{
1038        return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1039}
1040
1041/**
1042 * pci_remove_resource_files - cleanup resource files
1043 * @pdev: dev to cleanup
1044 *
1045 * If we created resource files for @pdev, remove them from sysfs and
1046 * free their resources.
1047 */
1048static void
1049pci_remove_resource_files(struct pci_dev *pdev)
1050{
1051        int i;
1052
1053        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1054                struct bin_attribute *res_attr;
1055
1056                res_attr = pdev->res_attr[i];
1057                if (res_attr) {
1058                        sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1059                        kfree(res_attr);
1060                }
1061
1062                res_attr = pdev->res_attr_wc[i];
1063                if (res_attr) {
1064                        sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1065                        kfree(res_attr);
1066                }
1067        }
1068}
1069
1070static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1071{
1072        /* allocate attribute structure, piggyback attribute name */
1073        int name_len = write_combine ? 13 : 10;
1074        struct bin_attribute *res_attr;
1075        int retval;
1076
1077        res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1078        if (res_attr) {
1079                char *res_attr_name = (char *)(res_attr + 1);
1080
1081                sysfs_bin_attr_init(res_attr);
1082                if (write_combine) {
1083                        pdev->res_attr_wc[num] = res_attr;
1084                        sprintf(res_attr_name, "resource%d_wc", num);
1085                        res_attr->mmap = pci_mmap_resource_wc;
1086                } else {
1087                        pdev->res_attr[num] = res_attr;
1088                        sprintf(res_attr_name, "resource%d", num);
1089                        res_attr->mmap = pci_mmap_resource_uc;
1090                }
1091                if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1092                        res_attr->read = pci_read_resource_io;
1093                        res_attr->write = pci_write_resource_io;
1094                }
1095                res_attr->attr.name = res_attr_name;
1096                res_attr->attr.mode = S_IRUSR | S_IWUSR;
1097                res_attr->size = pci_resource_len(pdev, num);
1098                res_attr->private = &pdev->resource[num];
1099                retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1100        } else
1101                retval = -ENOMEM;
1102
1103        return retval;
1104}
1105
1106/**
1107 * pci_create_resource_files - create resource files in sysfs for @dev
1108 * @pdev: dev in question
1109 *
1110 * Walk the resources in @pdev creating files for each resource available.
1111 */
1112static int pci_create_resource_files(struct pci_dev *pdev)
1113{
1114        int i;
1115        int retval;
1116
1117        /* Expose the PCI resources from this device as files */
1118        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1119
1120                /* skip empty resources */
1121                if (!pci_resource_len(pdev, i))
1122                        continue;
1123
1124                retval = pci_create_attr(pdev, i, 0);
1125                /* for prefetchable resources, create a WC mappable file */
1126                if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1127                        retval = pci_create_attr(pdev, i, 1);
1128
1129                if (retval) {
1130                        pci_remove_resource_files(pdev);
1131                        return retval;
1132                }
1133        }
1134        return 0;
1135}
1136#else /* !HAVE_PCI_MMAP */
1137int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1138void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1139#endif /* HAVE_PCI_MMAP */
1140
1141/**
1142 * pci_write_rom - used to enable access to the PCI ROM display
1143 * @filp: sysfs file
1144 * @kobj: kernel object handle
1145 * @bin_attr: struct bin_attribute for this file
1146 * @buf: user input
1147 * @off: file offset
1148 * @count: number of byte in input
1149 *
1150 * writing anything except 0 enables it
1151 */
1152static ssize_t
1153pci_write_rom(struct file *filp, struct kobject *kobj,
1154              struct bin_attribute *bin_attr,
1155              char *buf, loff_t off, size_t count)
1156{
1157        struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1158
1159        if ((off ==  0) && (*buf == '0') && (count == 2))
1160                pdev->rom_attr_enabled = 0;
1161        else
1162                pdev->rom_attr_enabled = 1;
1163
1164        return count;
1165}
1166
1167/**
1168 * pci_read_rom - read a PCI ROM
1169 * @filp: sysfs file
1170 * @kobj: kernel object handle
1171 * @bin_attr: struct bin_attribute for this file
1172 * @buf: where to put the data we read from the ROM
1173 * @off: file offset
1174 * @count: number of bytes to read
1175 *
1176 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1177 * device corresponding to @kobj.
1178 */
1179static ssize_t
1180pci_read_rom(struct file *filp, struct kobject *kobj,
1181             struct bin_attribute *bin_attr,
1182             char *buf, loff_t off, size_t count)
1183{
1184        struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1185        void __iomem *rom;
1186        size_t size;
1187
1188        if (!pdev->rom_attr_enabled)
1189                return -EINVAL;
1190        
1191        rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1192        if (!rom || !size)
1193                return -EIO;
1194                
1195        if (off >= size)
1196                count = 0;
1197        else {
1198                if (off + count > size)
1199                        count = size - off;
1200                
1201                memcpy_fromio(buf, rom + off, count);
1202        }
1203        pci_unmap_rom(pdev, rom);
1204                
1205        return count;
1206}
1207
1208static struct bin_attribute pci_config_attr = {
1209        .attr = {
1210                .name = "config",
1211                .mode = S_IRUGO | S_IWUSR,
1212        },
1213        .size = PCI_CFG_SPACE_SIZE,
1214        .read = pci_read_config,
1215        .write = pci_write_config,
1216};
1217
1218static struct bin_attribute pcie_config_attr = {
1219        .attr = {
1220                .name = "config",
1221                .mode = S_IRUGO | S_IWUSR,
1222        },
1223        .size = PCI_CFG_SPACE_EXP_SIZE,
1224        .read = pci_read_config,
1225        .write = pci_write_config,
1226};
1227
1228int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1229{
1230        return 0;
1231}
1232
1233static ssize_t reset_store(struct device *dev,
1234                           struct device_attribute *attr, const char *buf,
1235                           size_t count)
1236{
1237        struct pci_dev *pdev = to_pci_dev(dev);
1238        unsigned long val;
1239        ssize_t result = strict_strtoul(buf, 0, &val);
1240
1241        if (result < 0)
1242                return result;
1243
1244        if (val != 1)
1245                return -EINVAL;
1246
1247        result = pci_reset_function(pdev);
1248        if (result < 0)
1249                return result;
1250
1251        return count;
1252}
1253
1254static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1255
1256static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1257{
1258        int retval;
1259        struct bin_attribute *attr;
1260
1261        /* If the device has VPD, try to expose it in sysfs. */
1262        if (dev->vpd) {
1263                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1264                if (!attr)
1265                        return -ENOMEM;
1266
1267                sysfs_bin_attr_init(attr);
1268                attr->size = dev->vpd->len;
1269                attr->attr.name = "vpd";
1270                attr->attr.mode = S_IRUSR | S_IWUSR;
1271                attr->read = read_vpd_attr;
1272                attr->write = write_vpd_attr;
1273                retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1274                if (retval) {
1275                        kfree(attr);
1276                        return retval;
1277                }
1278                dev->vpd->attr = attr;
1279        }
1280
1281        /* Active State Power Management */
1282        pcie_aspm_create_sysfs_dev_files(dev);
1283
1284        if (!pci_probe_reset_function(dev)) {
1285                retval = device_create_file(&dev->dev, &reset_attr);
1286                if (retval)
1287                        goto error;
1288                dev->reset_fn = 1;
1289        }
1290        return 0;
1291
1292error:
1293        pcie_aspm_remove_sysfs_dev_files(dev);
1294        if (dev->vpd && dev->vpd->attr) {
1295                sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1296                kfree(dev->vpd->attr);
1297        }
1298
1299        return retval;
1300}
1301
1302int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1303{
1304        int retval;
1305        int rom_size = 0;
1306        struct bin_attribute *attr;
1307
1308        if (!sysfs_initialized)
1309                return -EACCES;
1310
1311        if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1312                retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1313        else
1314                retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1315        if (retval)
1316                goto err;
1317
1318        retval = pci_create_resource_files(pdev);
1319        if (retval)
1320                goto err_config_file;
1321
1322        if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1323                rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1324        else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1325                rom_size = 0x20000;
1326
1327        /* If the device has a ROM, try to expose it in sysfs. */
1328        if (rom_size) {
1329                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1330                if (!attr) {
1331                        retval = -ENOMEM;
1332                        goto err_resource_files;
1333                }
1334                sysfs_bin_attr_init(attr);
1335                attr->size = rom_size;
1336                attr->attr.name = "rom";
1337                attr->attr.mode = S_IRUSR | S_IWUSR;
1338                attr->read = pci_read_rom;
1339                attr->write = pci_write_rom;
1340                retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1341                if (retval) {
1342                        kfree(attr);
1343                        goto err_resource_files;
1344                }
1345                pdev->rom_attr = attr;
1346        }
1347
1348        /* add platform-specific attributes */
1349        retval = pcibios_add_platform_entries(pdev);
1350        if (retval)
1351                goto err_rom_file;
1352
1353        /* add sysfs entries for various capabilities */
1354        retval = pci_create_capabilities_sysfs(pdev);
1355        if (retval)
1356                goto err_rom_file;
1357
1358        pci_create_firmware_label_files(pdev);
1359
1360        return 0;
1361
1362err_rom_file:
1363        if (rom_size) {
1364                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1365                kfree(pdev->rom_attr);
1366                pdev->rom_attr = NULL;
1367        }
1368err_resource_files:
1369        pci_remove_resource_files(pdev);
1370err_config_file:
1371        if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1372                sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1373        else
1374                sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1375err:
1376        return retval;
1377}
1378
1379static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1380{
1381        if (dev->vpd && dev->vpd->attr) {
1382                sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1383                kfree(dev->vpd->attr);
1384        }
1385
1386        pcie_aspm_remove_sysfs_dev_files(dev);
1387        if (dev->reset_fn) {
1388                device_remove_file(&dev->dev, &reset_attr);
1389                dev->reset_fn = 0;
1390        }
1391}
1392
1393/**
1394 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1395 * @pdev: device whose entries we should free
1396 *
1397 * Cleanup when @pdev is removed from sysfs.
1398 */
1399void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1400{
1401        int rom_size = 0;
1402
1403        if (!sysfs_initialized)
1404                return;
1405
1406        pci_remove_capabilities_sysfs(pdev);
1407
1408        if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1409                sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1410        else
1411                sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1412
1413        pci_remove_resource_files(pdev);
1414
1415        if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1416                rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1417        else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1418                rom_size = 0x20000;
1419
1420        if (rom_size && pdev->rom_attr) {
1421                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1422                kfree(pdev->rom_attr);
1423        }
1424
1425        pci_remove_firmware_label_files(pdev);
1426
1427}
1428
1429static int __init pci_sysfs_init(void)
1430{
1431        struct pci_dev *pdev = NULL;
1432        int retval;
1433
1434        sysfs_initialized = 1;
1435        for_each_pci_dev(pdev) {
1436                retval = pci_create_sysfs_dev_files(pdev);
1437                if (retval) {
1438                        pci_dev_put(pdev);
1439                        return retval;
1440                }
1441        }
1442
1443        return 0;
1444}
1445
1446late_initcall(pci_sysfs_init);
1447
1448static struct attribute *pci_dev_dev_attrs[] = {
1449        &vga_attr.attr,
1450        NULL,
1451};
1452
1453static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1454                                                struct attribute *a, int n)
1455{
1456        struct device *dev = container_of(kobj, struct device, kobj);
1457        struct pci_dev *pdev = to_pci_dev(dev);
1458
1459        if (a == &vga_attr.attr)
1460                if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1461                        return 0;
1462
1463        return a->mode;
1464}
1465
1466#ifdef CONFIG_PCI_IOV
1467static struct attribute *sriov_dev_attrs[] = {
1468        &sriov_totalvfs_attr.attr,
1469        &sriov_numvfs_attr.attr,
1470        NULL,
1471};
1472
1473static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1474                                         struct attribute *a, int n)
1475{
1476        struct device *dev = container_of(kobj, struct device, kobj);
1477
1478        if (!dev_is_pf(dev))
1479                return 0;
1480
1481        return a->mode;
1482}
1483
1484static struct attribute_group sriov_dev_attr_group = {
1485        .attrs = sriov_dev_attrs,
1486        .is_visible = sriov_attrs_are_visible,
1487};
1488#endif /* CONFIG_PCI_IOV */
1489
1490static struct attribute_group pci_dev_attr_group = {
1491        .attrs = pci_dev_dev_attrs,
1492        .is_visible = pci_dev_attrs_are_visible,
1493};
1494
1495static const struct attribute_group *pci_dev_attr_groups[] = {
1496        &pci_dev_attr_group,
1497#ifdef CONFIG_PCI_IOV
1498        &sriov_dev_attr_group,
1499#endif
1500        NULL,
1501};
1502
1503struct device_type pci_dev_type = {
1504        .groups = pci_dev_attr_groups,
1505};
1506
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