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 "pci.h"
  31
  32static int sysfs_initialized;   /* = 0 */
  33
  34/* show configuration fields */
  35#define pci_config_attr(field, format_string)                           \
  36static ssize_t                                                          \
  37field##_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
  45pci_config_attr(vendor, "0x%04x\n");
  46pci_config_attr(device, "0x%04x\n");
  47pci_config_attr(subsystem_vendor, "0x%04x\n");
  48pci_config_attr(subsystem_device, "0x%04x\n");
  49pci_config_attr(class, "0x%06x\n");
  50pci_config_attr(irq, "%u\n");
  51
  52static ssize_t broken_parity_status_show(struct device *dev,
  53                                         struct device_attribute *attr,
  54                                         char *buf)
  55{
  56        struct pci_dev *pdev = to_pci_dev(dev);
  57        return sprintf (buf, "%u\n", pdev->broken_parity_status);
  58}
  59
  60static ssize_t broken_parity_status_store(struct device *dev,
  61                                          struct device_attribute *attr,
  62                                          const char *buf, size_t count)
  63{
  64        struct pci_dev *pdev = to_pci_dev(dev);
  65        unsigned long val;
  66
  67        if (strict_strtoul(buf, 0, &val) < 0)
  68                return -EINVAL;
  69
  70        pdev->broken_parity_status = !!val;
  71
  72        return count;
  73}
  74
  75static ssize_t local_cpus_show(struct device *dev,
  76                        struct device_attribute *attr, char *buf)
  77{               
  78        const struct cpumask *mask;
  79        int len;
  80
  81#ifdef CONFIG_NUMA
  82        mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  83                                          cpumask_of_node(dev_to_node(dev));
  84#else
  85        mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  86#endif
  87        len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  88        buf[len++] = '\n';
  89        buf[len] = '\0';
  90        return len;
  91}
  92
  93
  94static ssize_t local_cpulist_show(struct device *dev,
  95                        struct device_attribute *attr, char *buf)
  96{
  97        const struct cpumask *mask;
  98        int len;
  99
 100#ifdef CONFIG_NUMA
 101        mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
 102                                          cpumask_of_node(dev_to_node(dev));
 103#else
 104        mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
 105#endif
 106        len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
 107        buf[len++] = '\n';
 108        buf[len] = '\0';
 109        return len;
 110}
 111
 112/*
 113 * PCI Bus Class Devices
 114 */
 115static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
 116                                        int type,
 117                                        struct device_attribute *attr,
 118                                        char *buf)
 119{
 120        int ret;
 121        const struct cpumask *cpumask;
 122
 123        cpumask = cpumask_of_pcibus(to_pci_bus(dev));
 124        ret = type ?
 125                cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
 126                cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
 127        buf[ret++] = '\n';
 128        buf[ret] = '\0';
 129        return ret;
 130}
 131
 132static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
 133                                        struct device_attribute *attr,
 134                                        char *buf)
 135{
 136        return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
 137}
 138
 139static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
 140                                        struct device_attribute *attr,
 141                                        char *buf)
 142{
 143        return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
 144}
 145
 146/* show resources */
 147static ssize_t
 148resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 149{
 150        struct pci_dev * pci_dev = to_pci_dev(dev);
 151        char * str = buf;
 152        int i;
 153        int max;
 154        resource_size_t start, end;
 155
 156        if (pci_dev->subordinate)
 157                max = DEVICE_COUNT_RESOURCE;
 158        else
 159                max = PCI_BRIDGE_RESOURCES;
 160
 161        for (i = 0; i < max; i++) {
 162                struct resource *res =  &pci_dev->resource[i];
 163                pci_resource_to_user(pci_dev, i, res, &start, &end);
 164                str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 165                               (unsigned long long)start,
 166                               (unsigned long long)end,
 167                               (unsigned long long)res->flags);
 168        }
 169        return (str - buf);
 170}
 171
 172static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 173{
 174        struct pci_dev *pci_dev = to_pci_dev(dev);
 175
 176        return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 177                       pci_dev->vendor, pci_dev->device,
 178                       pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 179                       (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 180                       (u8)(pci_dev->class));
 181}
 182
 183static ssize_t is_enabled_store(struct device *dev,
 184                                struct device_attribute *attr, const char *buf,
 185                                size_t count)
 186{
 187        struct pci_dev *pdev = to_pci_dev(dev);
 188        unsigned long val;
 189        ssize_t result = strict_strtoul(buf, 0, &val);
 190
 191        if (result < 0)
 192                return result;
 193
 194        /* this can crash the machine when done on the "wrong" device */
 195        if (!capable(CAP_SYS_ADMIN))
 196                return -EPERM;
 197
 198        if (!val) {
 199                if (pci_is_enabled(pdev))
 200                        pci_disable_device(pdev);
 201                else
 202                        result = -EIO;
 203        } else
 204                result = pci_enable_device(pdev);
 205
 206        return result < 0 ? result : count;
 207}
 208
 209static ssize_t is_enabled_show(struct device *dev,
 210                               struct device_attribute *attr, char *buf)
 211{
 212        struct pci_dev *pdev;
 213
 214        pdev = to_pci_dev (dev);
 215        return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 216}
 217
 218#ifdef CONFIG_NUMA
 219static ssize_t
 220numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 221{
 222        return sprintf (buf, "%d\n", dev->numa_node);
 223}
 224#endif
 225
 226static ssize_t
 227dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
 228{
 229        struct pci_dev *pdev = to_pci_dev(dev);
 230
 231        return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
 232}
 233
 234static ssize_t
 235consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
 236                                 char *buf)
 237{
 238        return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
 239}
 240
 241static ssize_t
 242msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 243{
 244        struct pci_dev *pdev = to_pci_dev(dev);
 245
 246        if (!pdev->subordinate)
 247                return 0;
 248
 249        return sprintf (buf, "%u\n",
 250                        !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 251}
 252
 253static ssize_t
 254msi_bus_store(struct device *dev, struct device_attribute *attr,
 255              const char *buf, size_t count)
 256{
 257        struct pci_dev *pdev = to_pci_dev(dev);
 258        unsigned long val;
 259
 260        if (strict_strtoul(buf, 0, &val) < 0)
 261                return -EINVAL;
 262
 263        /* bad things may happen if the no_msi flag is changed
 264         * while some drivers are loaded */
 265        if (!capable(CAP_SYS_ADMIN))
 266                return -EPERM;
 267
 268        /* Maybe pci devices without subordinate busses shouldn't even have this
 269         * attribute in the first place?  */
 270        if (!pdev->subordinate)
 271                return count;
 272
 273        /* Is the flag going to change, or keep the value it already had? */
 274        if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 275            !!val) {
 276                pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 277
 278                dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 279                         " bad things could happen\n", val ? "" : " not");
 280        }
 281
 282        return count;
 283}
 284
 285#ifdef CONFIG_HOTPLUG
 286static DEFINE_MUTEX(pci_remove_rescan_mutex);
 287static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 288                                size_t count)
 289{
 290        unsigned long val;
 291        struct pci_bus *b = NULL;
 292
 293        if (strict_strtoul(buf, 0, &val) < 0)
 294                return -EINVAL;
 295
 296        if (val) {
 297                mutex_lock(&pci_remove_rescan_mutex);
 298                while ((b = pci_find_next_bus(b)) != NULL)
 299                        pci_rescan_bus(b);
 300                mutex_unlock(&pci_remove_rescan_mutex);
 301        }
 302        return count;
 303}
 304
 305struct bus_attribute pci_bus_attrs[] = {
 306        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
 307        __ATTR_NULL
 308};
 309
 310static ssize_t
 311dev_rescan_store(struct device *dev, struct device_attribute *attr,
 312                 const char *buf, size_t count)
 313{
 314        unsigned long val;
 315        struct pci_dev *pdev = to_pci_dev(dev);
 316
 317        if (strict_strtoul(buf, 0, &val) < 0)
 318                return -EINVAL;
 319
 320        if (val) {
 321                mutex_lock(&pci_remove_rescan_mutex);
 322                pci_rescan_bus(pdev->bus);
 323                mutex_unlock(&pci_remove_rescan_mutex);
 324        }
 325        return count;
 326}
 327
 328static void remove_callback(struct device *dev)
 329{
 330        struct pci_dev *pdev = to_pci_dev(dev);
 331
 332        mutex_lock(&pci_remove_rescan_mutex);
 333        pci_remove_bus_device(pdev);
 334        mutex_unlock(&pci_remove_rescan_mutex);
 335}
 336
 337static ssize_t
 338remove_store(struct device *dev, struct device_attribute *dummy,
 339             const char *buf, size_t count)
 340{
 341        int ret = 0;
 342        unsigned long val;
 343
 344        if (strict_strtoul(buf, 0, &val) < 0)
 345                return -EINVAL;
 346
 347        /* An attribute cannot be unregistered by one of its own methods,
 348         * so we have to use this roundabout approach.
 349         */
 350        if (val)
 351                ret = device_schedule_callback(dev, remove_callback);
 352        if (ret)
 353                count = ret;
 354        return count;
 355}
 356
 357static ssize_t
 358dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 359                 const char *buf, size_t count)
 360{
 361        unsigned long val;
 362        struct pci_bus *bus = to_pci_bus(dev);
 363
 364        if (strict_strtoul(buf, 0, &val) < 0)
 365                return -EINVAL;
 366
 367        if (val) {
 368                mutex_lock(&pci_remove_rescan_mutex);
 369                pci_rescan_bus(bus);
 370                mutex_unlock(&pci_remove_rescan_mutex);
 371        }
 372        return count;
 373}
 374
 375#endif
 376
 377struct device_attribute pci_dev_attrs[] = {
 378        __ATTR_RO(resource),
 379        __ATTR_RO(vendor),
 380        __ATTR_RO(device),
 381        __ATTR_RO(subsystem_vendor),
 382        __ATTR_RO(subsystem_device),
 383        __ATTR_RO(class),
 384        __ATTR_RO(irq),
 385        __ATTR_RO(local_cpus),
 386        __ATTR_RO(local_cpulist),
 387        __ATTR_RO(modalias),
 388#ifdef CONFIG_NUMA
 389        __ATTR_RO(numa_node),
 390#endif
 391        __ATTR_RO(dma_mask_bits),
 392        __ATTR_RO(consistent_dma_mask_bits),
 393        __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 394        __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 395                broken_parity_status_show,broken_parity_status_store),
 396        __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 397#ifdef CONFIG_HOTPLUG
 398        __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
 399        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
 400#endif
 401        __ATTR_NULL,
 402};
 403
 404struct device_attribute pcibus_dev_attrs[] = {
 405#ifdef CONFIG_HOTPLUG
 406        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
 407#endif
 408        __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
 409        __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
 410        __ATTR_NULL,
 411};
 412
 413static ssize_t
 414boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 415{
 416        struct pci_dev *pdev = to_pci_dev(dev);
 417
 418        return sprintf(buf, "%u\n",
 419                !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 420                   IORESOURCE_ROM_SHADOW));
 421}
 422struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 423
 424static ssize_t
 425pci_read_config(struct file *filp, struct kobject *kobj,
 426                struct bin_attribute *bin_attr,
 427                char *buf, loff_t off, size_t count)
 428{
 429        struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 430        unsigned int size = 64;
 431        loff_t init_off = off;
 432        u8 *data = (u8*) buf;
 433
 434        /* Several chips lock up trying to read undefined config space */
 435        if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
 436                size = dev->cfg_size;
 437        } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 438                size = 128;
 439        }
 440
 441        if (off > size)
 442                return 0;
 443        if (off + count > size) {
 444                size -= off;
 445                count = size;
 446        } else {
 447                size = count;
 448        }
 449
 450        if ((off & 1) && size) {
 451                u8 val;
 452                pci_user_read_config_byte(dev, off, &val);
 453                data[off - init_off] = val;
 454                off++;
 455                size--;
 456        }
 457
 458        if ((off & 3) && size > 2) {
 459                u16 val;
 460                pci_user_read_config_word(dev, off, &val);
 461                data[off - init_off] = val & 0xff;
 462                data[off - init_off + 1] = (val >> 8) & 0xff;
 463                off += 2;
 464                size -= 2;
 465        }
 466
 467        while (size > 3) {
 468                u32 val;
 469                pci_user_read_config_dword(dev, off, &val);
 470                data[off - init_off] = val & 0xff;
 471                data[off - init_off + 1] = (val >> 8) & 0xff;
 472                data[off - init_off + 2] = (val >> 16) & 0xff;
 473                data[off - init_off + 3] = (val >> 24) & 0xff;
 474                off += 4;
 475                size -= 4;
 476        }
 477
 478        if (size >= 2) {
 479                u16 val;
 480                pci_user_read_config_word(dev, off, &val);
 481                data[off - init_off] = val & 0xff;
 482                data[off - init_off + 1] = (val >> 8) & 0xff;
 483                off += 2;
 484                size -= 2;
 485        }
 486
 487        if (size > 0) {
 488                u8 val;
 489                pci_user_read_config_byte(dev, off, &val);
 490                data[off - init_off] = val;
 491                off++;
 492                --size;
 493        }
 494
 495        return count;
 496}
 497
 498static ssize_t
 499pci_write_config(struct file* filp, struct kobject *kobj,
 500                 struct bin_attribute *bin_attr,
 501                 char *buf, loff_t off, size_t count)
 502{
 503        struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 504        unsigned int size = count;
 505        loff_t init_off = off;
 506        u8 *data = (u8*) buf;
 507
 508        if (off > dev->cfg_size)
 509                return 0;
 510        if (off + count > dev->cfg_size) {
 511                size = dev->cfg_size - off;
 512                count = size;
 513        }
 514        
 515        if ((off & 1) && size) {
 516                pci_user_write_config_byte(dev, off, data[off - init_off]);
 517                off++;
 518                size--;
 519        }
 520        
 521        if ((off & 3) && size > 2) {
 522                u16 val = data[off - init_off];
 523                val |= (u16) data[off - init_off + 1] << 8;
 524                pci_user_write_config_word(dev, off, val);
 525                off += 2;
 526                size -= 2;
 527        }
 528
 529        while (size > 3) {
 530                u32 val = data[off - init_off];
 531                val |= (u32) data[off - init_off + 1] << 8;
 532                val |= (u32) data[off - init_off + 2] << 16;
 533                val |= (u32) data[off - init_off + 3] << 24;
 534                pci_user_write_config_dword(dev, off, val);
 535                off += 4;
 536                size -= 4;
 537        }
 538        
 539        if (size >= 2) {
 540                u16 val = data[off - init_off];
 541                val |= (u16) data[off - init_off + 1] << 8;
 542                pci_user_write_config_word(dev, off, val);
 543                off += 2;
 544                size -= 2;
 545        }
 546
 547        if (size) {
 548                pci_user_write_config_byte(dev, off, data[off - init_off]);
 549                off++;
 550                --size;
 551        }
 552
 553        return count;
 554}
 555
 556static ssize_t
 557read_vpd_attr(struct file *filp, struct kobject *kobj,
 558              struct bin_attribute *bin_attr,
 559              char *buf, loff_t off, size_t count)
 560{
 561        struct pci_dev *dev =
 562                to_pci_dev(container_of(kobj, struct device, kobj));
 563
 564        if (off > bin_attr->size)
 565                count = 0;
 566        else if (count > bin_attr->size - off)
 567                count = bin_attr->size - off;
 568
 569        return pci_read_vpd(dev, off, count, buf);
 570}
 571
 572static ssize_t
 573write_vpd_attr(struct file *filp, struct kobject *kobj,
 574               struct bin_attribute *bin_attr,
 575               char *buf, loff_t off, size_t count)
 576{
 577        struct pci_dev *dev =
 578                to_pci_dev(container_of(kobj, struct device, kobj));
 579
 580        if (off > bin_attr->size)
 581                count = 0;
 582        else if (count > bin_attr->size - off)
 583                count = bin_attr->size - off;
 584
 585        return pci_write_vpd(dev, off, count, buf);
 586}
 587
 588#ifdef HAVE_PCI_LEGACY
 589/**
 590 * pci_read_legacy_io - read byte(s) from legacy I/O port space
 591 * @filp: open sysfs file
 592 * @kobj: kobject corresponding to file to read from
 593 * @bin_attr: struct bin_attribute for this file
 594 * @buf: buffer to store results
 595 * @off: offset into legacy I/O port space
 596 * @count: number of bytes to read
 597 *
 598 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 599 * callback routine (pci_legacy_read).
 600 */
 601static ssize_t
 602pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 603                   struct bin_attribute *bin_attr,
 604                   char *buf, loff_t off, size_t count)
 605{
 606        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 607                                                      struct device,
 608                                                      kobj));
 609
 610        /* Only support 1, 2 or 4 byte accesses */
 611        if (count != 1 && count != 2 && count != 4)
 612                return -EINVAL;
 613
 614        return pci_legacy_read(bus, off, (u32 *)buf, count);
 615}
 616
 617/**
 618 * pci_write_legacy_io - write byte(s) to legacy I/O port space
 619 * @filp: open sysfs file
 620 * @kobj: kobject corresponding to file to read from
 621 * @bin_attr: struct bin_attribute for this file
 622 * @buf: buffer containing value to be written
 623 * @off: offset into legacy I/O port space
 624 * @count: number of bytes to write
 625 *
 626 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 627 * callback routine (pci_legacy_write).
 628 */
 629static ssize_t
 630pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 631                    struct bin_attribute *bin_attr,
 632                    char *buf, loff_t off, size_t count)
 633{
 634        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 635                                                      struct device,
 636                                                      kobj));
 637        /* Only support 1, 2 or 4 byte accesses */
 638        if (count != 1 && count != 2 && count != 4)
 639                return -EINVAL;
 640
 641        return pci_legacy_write(bus, off, *(u32 *)buf, count);
 642}
 643
 644/**
 645 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 646 * @filp: open sysfs file
 647 * @kobj: kobject corresponding to device to be mapped
 648 * @attr: struct bin_attribute for this file
 649 * @vma: struct vm_area_struct passed to mmap
 650 *
 651 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 652 * legacy memory space (first meg of bus space) into application virtual
 653 * memory space.
 654 */
 655static int
 656pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 657                    struct bin_attribute *attr,
 658                    struct vm_area_struct *vma)
 659{
 660        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 661                                                      struct device,
 662                                                      kobj));
 663
 664        return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 665}
 666
 667/**
 668 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 669 * @filp: open sysfs file
 670 * @kobj: kobject corresponding to device to be mapped
 671 * @attr: struct bin_attribute for this file
 672 * @vma: struct vm_area_struct passed to mmap
 673 *
 674 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 675 * legacy IO space (first meg of bus space) into application virtual
 676 * memory space. Returns -ENOSYS if the operation isn't supported
 677 */
 678static int
 679pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 680                   struct bin_attribute *attr,
 681                   struct vm_area_struct *vma)
 682{
 683        struct pci_bus *bus = to_pci_bus(container_of(kobj,
 684                                                      struct device,
 685                                                      kobj));
 686
 687        return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 688}
 689
 690/**
 691 * pci_adjust_legacy_attr - adjustment of legacy file attributes
 692 * @b: bus to create files under
 693 * @mmap_type: I/O port or memory
 694 *
 695 * Stub implementation. Can be overridden by arch if necessary.
 696 */
 697void __weak
 698pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 699{
 700        return;
 701}
 702
 703/**
 704 * pci_create_legacy_files - create legacy I/O port and memory files
 705 * @b: bus to create files under
 706 *
 707 * Some platforms allow access to legacy I/O port and ISA memory space on
 708 * a per-bus basis.  This routine creates the files and ties them into
 709 * their associated read, write and mmap files from pci-sysfs.c
 710 *
 711 * On error unwind, but don't propagate the error to the caller
 712 * as it is ok to set up the PCI bus without these files.
 713 */
 714void pci_create_legacy_files(struct pci_bus *b)
 715{
 716        int error;
 717
 718        b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 719                               GFP_ATOMIC);
 720        if (!b->legacy_io)
 721                goto kzalloc_err;
 722
 723        sysfs_bin_attr_init(b->legacy_io);
 724        b->legacy_io->attr.name = "legacy_io";
 725        b->legacy_io->size = 0xffff;
 726        b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 727        b->legacy_io->read = pci_read_legacy_io;
 728        b->legacy_io->write = pci_write_legacy_io;
 729        b->legacy_io->mmap = pci_mmap_legacy_io;
 730        pci_adjust_legacy_attr(b, pci_mmap_io);
 731        error = device_create_bin_file(&b->dev, b->legacy_io);
 732        if (error)
 733                goto legacy_io_err;
 734
 735        /* Allocated above after the legacy_io struct */
 736        b->legacy_mem = b->legacy_io + 1;
 737        sysfs_bin_attr_init(b->legacy_mem);
 738        b->legacy_mem->attr.name = "legacy_mem";
 739        b->legacy_mem->size = 1024*1024;
 740        b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 741        b->legacy_mem->mmap = pci_mmap_legacy_mem;
 742        pci_adjust_legacy_attr(b, pci_mmap_mem);
 743        error = device_create_bin_file(&b->dev, b->legacy_mem);
 744        if (error)
 745                goto legacy_mem_err;
 746
 747        return;
 748
 749legacy_mem_err:
 750        device_remove_bin_file(&b->dev, b->legacy_io);
 751legacy_io_err:
 752        kfree(b->legacy_io);
 753        b->legacy_io = NULL;
 754kzalloc_err:
 755        printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 756               "and ISA memory resources to sysfs\n");
 757        return;
 758}
 759
 760void pci_remove_legacy_files(struct pci_bus *b)
 761{
 762        if (b->legacy_io) {
 763                device_remove_bin_file(&b->dev, b->legacy_io);
 764                device_remove_bin_file(&b->dev, b->legacy_mem);
 765                kfree(b->legacy_io); /* both are allocated here */
 766        }
 767}
 768#endif /* HAVE_PCI_LEGACY */
 769
 770#ifdef HAVE_PCI_MMAP
 771
 772int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 773                  enum pci_mmap_api mmap_api)
 774{
 775        unsigned long nr, start, size, pci_start;
 776
 777        if (pci_resource_len(pdev, resno) == 0)
 778                return 0;
 779        nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 780        start = vma->vm_pgoff;
 781        size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 782        pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 783                        pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 784        if (start >= pci_start && start < pci_start + size &&
 785                        start + nr <= pci_start + size)
 786                return 1;
 787        return 0;
 788}
 789
 790/**
 791 * pci_mmap_resource - map a PCI resource into user memory space
 792 * @kobj: kobject for mapping
 793 * @attr: struct bin_attribute for the file being mapped
 794 * @vma: struct vm_area_struct passed into the mmap
 795 * @write_combine: 1 for write_combine mapping
 796 *
 797 * Use the regular PCI mapping routines to map a PCI resource into userspace.
 798 */
 799static int
 800pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 801                  struct vm_area_struct *vma, int write_combine)
 802{
 803        struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 804                                                       struct device, kobj));
 805        struct resource *res = attr->private;
 806        enum pci_mmap_state mmap_type;
 807        resource_size_t start, end;
 808        int i;
 809
 810        for (i = 0; i < PCI_ROM_RESOURCE; i++)
 811                if (res == &pdev->resource[i])
 812                        break;
 813        if (i >= PCI_ROM_RESOURCE)
 814                return -ENODEV;
 815
 816        if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
 817                WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
 818                        "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
 819                        current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
 820                        pci_name(pdev), i,
 821                        (u64)pci_resource_start(pdev, i),
 822                        (u64)pci_resource_len(pdev, i));
 823                return -EINVAL;
 824        }
 825
 826        /* pci_mmap_page_range() expects the same kind of entry as coming
 827         * from /proc/bus/pci/ which is a "user visible" value. If this is
 828         * different from the resource itself, arch will do necessary fixup.
 829         */
 830        pci_resource_to_user(pdev, i, res, &start, &end);
 831        vma->vm_pgoff += start >> PAGE_SHIFT;
 832        mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 833
 834        if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 835                return -EINVAL;
 836
 837        return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 838}
 839
 840static int
 841pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
 842                     struct bin_attribute *attr,
 843                     struct vm_area_struct *vma)
 844{
 845        return pci_mmap_resource(kobj, attr, vma, 0);
 846}
 847
 848static int
 849pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
 850                     struct bin_attribute *attr,
 851                     struct vm_area_struct *vma)
 852{
 853        return pci_mmap_resource(kobj, attr, vma, 1);
 854}
 855
 856static ssize_t
 857pci_resource_io(struct file *filp, struct kobject *kobj,
 858                struct bin_attribute *attr, char *buf,
 859                loff_t off, size_t count, bool write)
 860{
 861        struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 862                                                       struct device, kobj));
 863        struct resource *res = attr->private;
 864        unsigned long port = off;
 865        int i;
 866
 867        for (i = 0; i < PCI_ROM_RESOURCE; i++)
 868                if (res == &pdev->resource[i])
 869                        break;
 870        if (i >= PCI_ROM_RESOURCE)
 871                return -ENODEV;
 872
 873        port += pci_resource_start(pdev, i);
 874
 875        if (port > pci_resource_end(pdev, i))
 876                return 0;
 877
 878        if (port + count - 1 > pci_resource_end(pdev, i))
 879                return -EINVAL;
 880
 881        switch (count) {
 882        case 1:
 883                if (write)
 884                        outb(*(u8 *)buf, port);
 885                else
 886                        *(u8 *)buf = inb(port);
 887                return 1;
 888        case 2:
 889                if (write)
 890                        outw(*(u16 *)buf, port);
 891                else
 892                        *(u16 *)buf = inw(port);
 893                return 2;
 894        case 4:
 895                if (write)
 896                        outl(*(u32 *)buf, port);
 897                else
 898                        *(u32 *)buf = inl(port);
 899                return 4;
 900        }
 901        return -EINVAL;
 902}
 903
 904static ssize_t
 905pci_read_resource_io(struct file *filp, struct kobject *kobj,
 906                     struct bin_attribute *attr, char *buf,
 907                     loff_t off, size_t count)
 908{
 909        return pci_resource_io(filp, kobj, attr, buf, off, count, false);
 910}
 911
 912static ssize_t
 913pci_write_resource_io(struct file *filp, struct kobject *kobj,
 914                      struct bin_attribute *attr, char *buf,
 915                      loff_t off, size_t count)
 916{
 917        return pci_resource_io(filp, kobj, attr, buf, off, count, true);
 918}
 919
 920/**
 921 * pci_remove_resource_files - cleanup resource files
 922 * @pdev: dev to cleanup
 923 *
 924 * If we created resource files for @pdev, remove them from sysfs and
 925 * free their resources.
 926 */
 927static void
 928pci_remove_resource_files(struct pci_dev *pdev)
 929{
 930        int i;
 931
 932        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 933                struct bin_attribute *res_attr;
 934
 935                res_attr = pdev->res_attr[i];
 936                if (res_attr) {
 937                        sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 938                        kfree(res_attr);
 939                }
 940
 941                res_attr = pdev->res_attr_wc[i];
 942                if (res_attr) {
 943                        sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 944                        kfree(res_attr);
 945                }
 946        }
 947}
 948
 949static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 950{
 951        /* allocate attribute structure, piggyback attribute name */
 952        int name_len = write_combine ? 13 : 10;
 953        struct bin_attribute *res_attr;
 954        int retval;
 955
 956        res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 957        if (res_attr) {
 958                char *res_attr_name = (char *)(res_attr + 1);
 959
 960                sysfs_bin_attr_init(res_attr);
 961                if (write_combine) {
 962                        pdev->res_attr_wc[num] = res_attr;
 963                        sprintf(res_attr_name, "resource%d_wc", num);
 964                        res_attr->mmap = pci_mmap_resource_wc;
 965                } else {
 966                        pdev->res_attr[num] = res_attr;
 967                        sprintf(res_attr_name, "resource%d", num);
 968                        res_attr->mmap = pci_mmap_resource_uc;
 969                }
 970                if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
 971                        res_attr->read = pci_read_resource_io;
 972                        res_attr->write = pci_write_resource_io;
 973                }
 974                res_attr->attr.name = res_attr_name;
 975                res_attr->attr.mode = S_IRUSR | S_IWUSR;
 976                res_attr->size = pci_resource_len(pdev, num);
 977                res_attr->private = &pdev->resource[num];
 978                retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 979        } else
 980                retval = -ENOMEM;
 981
 982        return retval;
 983}
 984
 985/**
 986 * pci_create_resource_files - create resource files in sysfs for @dev
 987 * @pdev: dev in question
 988 *
 989 * Walk the resources in @pdev creating files for each resource available.
 990 */
 991static int pci_create_resource_files(struct pci_dev *pdev)
 992{
 993        int i;
 994        int retval;
 995
 996        /* Expose the PCI resources from this device as files */
 997        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 998
 999                /* skip empty resources */
1000                if (!pci_resource_len(pdev, i))
1001                        continue;
1002
1003                retval = pci_create_attr(pdev, i, 0);
1004                /* for prefetchable resources, create a WC mappable file */
1005                if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1006                        retval = pci_create_attr(pdev, i, 1);
1007
1008                if (retval) {
1009                        pci_remove_resource_files(pdev);
1010                        return retval;
1011                }
1012        }
1013        return 0;
1014}
1015#else /* !HAVE_PCI_MMAP */
1016int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1017void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1018#endif /* HAVE_PCI_MMAP */
1019
1020/**
1021 * pci_write_rom - used to enable access to the PCI ROM display
1022 * @filp: sysfs file
1023 * @kobj: kernel object handle
1024 * @bin_attr: struct bin_attribute for this file
1025 * @buf: user input
1026 * @off: file offset
1027 * @count: number of byte in input
1028 *
1029 * writing anything except 0 enables it
1030 */
1031static ssize_t
1032pci_write_rom(struct file *filp, struct kobject *kobj,
1033              struct bin_attribute *bin_attr,
1034              char *buf, loff_t off, size_t count)
1035{
1036        struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1037
1038        if ((off ==  0) && (*buf == '0') && (count == 2))
1039                pdev->rom_attr_enabled = 0;
1040        else
1041                pdev->rom_attr_enabled = 1;
1042
1043        return count;
1044}
1045
1046/**
1047 * pci_read_rom - read a PCI ROM
1048 * @filp: sysfs file
1049 * @kobj: kernel object handle
1050 * @bin_attr: struct bin_attribute for this file
1051 * @buf: where to put the data we read from the ROM
1052 * @off: file offset
1053 * @count: number of bytes to read
1054 *
1055 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1056 * device corresponding to @kobj.
1057 */
1058static ssize_t
1059pci_read_rom(struct file *filp, struct kobject *kobj,
1060             struct bin_attribute *bin_attr,
1061             char *buf, loff_t off, size_t count)
1062{
1063        struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1064        void __iomem *rom;
1065        size_t size;
1066
1067        if (!pdev->rom_attr_enabled)
1068                return -EINVAL;
1069        
1070        rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1071        if (!rom || !size)
1072                return -EIO;
1073                
1074        if (off >= size)
1075                count = 0;
1076        else {
1077                if (off + count > size)
1078                        count = size - off;
1079                
1080                memcpy_fromio(buf, rom + off, count);
1081        }
1082        pci_unmap_rom(pdev, rom);
1083                
1084        return count;
1085}
1086
1087static struct bin_attribute pci_config_attr = {
1088        .attr = {
1089                .name = "config",
1090                .mode = S_IRUGO | S_IWUSR,
1091        },
1092        .size = PCI_CFG_SPACE_SIZE,
1093        .read = pci_read_config,
1094        .write = pci_write_config,
1095};
1096
1097static struct bin_attribute pcie_config_attr = {
1098        .attr = {
1099                .name = "config",
1100                .mode = S_IRUGO | S_IWUSR,
1101        },
1102        .size = PCI_CFG_SPACE_EXP_SIZE,
1103        .read = pci_read_config,
1104        .write = pci_write_config,
1105};
1106
1107int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1108{
1109        return 0;
1110}
1111
1112static ssize_t reset_store(struct device *dev,
1113                           struct device_attribute *attr, const char *buf,
1114                           size_t count)
1115{
1116        struct pci_dev *pdev = to_pci_dev(dev);
1117        unsigned long val;
1118        ssize_t result = strict_strtoul(buf, 0, &val);
1119
1120        if (result < 0)
1121                return result;
1122
1123        if (val != 1)
1124                return -EINVAL;
1125
1126        result = pci_reset_function(pdev);
1127        if (result < 0)
1128                return result;
1129
1130        return count;
1131}
1132
1133static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1134
1135static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1136{
1137        int retval;
1138        struct bin_attribute *attr;
1139
1140        /* If the device has VPD, try to expose it in sysfs. */
1141        if (dev->vpd) {
1142                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1143                if (!attr)
1144                        return -ENOMEM;
1145
1146                sysfs_bin_attr_init(attr);
1147                attr->size = dev->vpd->len;
1148                attr->attr.name = "vpd";
1149                attr->attr.mode = S_IRUSR | S_IWUSR;
1150                attr->read = read_vpd_attr;
1151                attr->write = write_vpd_attr;
1152                retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1153                if (retval) {
1154                        kfree(attr);
1155                        return retval;
1156                }
1157                dev->vpd->attr = attr;
1158        }
1159
1160        /* Active State Power Management */
1161        pcie_aspm_create_sysfs_dev_files(dev);
1162
1163        if (!pci_probe_reset_function(dev)) {
1164                retval = device_create_file(&dev->dev, &reset_attr);
1165                if (retval)
1166                        goto error;
1167                dev->reset_fn = 1;
1168        }
1169        return 0;
1170
1171error:
1172        pcie_aspm_remove_sysfs_dev_files(dev);
1173        if (dev->vpd && dev->vpd->attr) {
1174                sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1175                kfree(dev->vpd->attr);
1176        }
1177
1178        return retval;
1179}
1180
1181int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1182{
1183        int retval;
1184        int rom_size = 0;
1185        struct bin_attribute *attr;
1186
1187        if (!sysfs_initialized)
1188                return -EACCES;
1189
1190        if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1191                retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1192        else
1193                retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1194        if (retval)
1195                goto err;
1196
1197        retval = pci_create_resource_files(pdev);
1198        if (retval)
1199                goto err_config_file;
1200
1201        if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1202                rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1203        else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1204                rom_size = 0x20000;
1205
1206        /* If the device has a ROM, try to expose it in sysfs. */
1207        if (rom_size) {
1208                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1209                if (!attr) {
1210                        retval = -ENOMEM;
1211                        goto err_resource_files;
1212                }
1213                sysfs_bin_attr_init(attr);
1214                attr->size = rom_size;
1215                attr->attr.name = "rom";
1216                attr->attr.mode = S_IRUSR | S_IWUSR;
1217                attr->read = pci_read_rom;
1218                attr->write = pci_write_rom;
1219                retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1220                if (retval) {
1221                        kfree(attr);
1222                        goto err_resource_files;
1223                }
1224                pdev->rom_attr = attr;
1225        }
1226
1227        if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1228                retval = device_create_file(&pdev->dev, &vga_attr);
1229                if (retval)
1230                        goto err_rom_file;
1231        }
1232
1233        /* add platform-specific attributes */
1234        retval = pcibios_add_platform_entries(pdev);
1235        if (retval)
1236                goto err_vga_file;
1237
1238        /* add sysfs entries for various capabilities */
1239        retval = pci_create_capabilities_sysfs(pdev);
1240        if (retval)
1241                goto err_vga_file;
1242
1243        pci_create_firmware_label_files(pdev);
1244
1245        return 0;
1246
1247err_vga_file:
1248        if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1249                device_remove_file(&pdev->dev, &vga_attr);
1250err_rom_file:
1251        if (rom_size) {
1252                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1253                kfree(pdev->rom_attr);
1254                pdev->rom_attr = NULL;
1255        }
1256err_resource_files:
1257        pci_remove_resource_files(pdev);
1258err_config_file:
1259        if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1260                sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1261        else
1262                sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1263err:
1264        return retval;
1265}
1266
1267static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1268{
1269        if (dev->vpd && dev->vpd->attr) {
1270                sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1271                kfree(dev->vpd->attr);
1272        }
1273
1274        pcie_aspm_remove_sysfs_dev_files(dev);
1275        if (dev->reset_fn) {
1276                device_remove_file(&dev->dev, &reset_attr);
1277                dev->reset_fn = 0;
1278        }
1279}
1280
1281/**
1282 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1283 * @pdev: device whose entries we should free
1284 *
1285 * Cleanup when @pdev is removed from sysfs.
1286 */
1287void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1288{
1289        int rom_size = 0;
1290
1291        if (!sysfs_initialized)
1292                return;
1293
1294        pci_remove_capabilities_sysfs(pdev);
1295
1296        if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1297                sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1298        else
1299                sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1300
1301        pci_remove_resource_files(pdev);
1302
1303        if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1304                rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1305        else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1306                rom_size = 0x20000;
1307
1308        if (rom_size && pdev->rom_attr) {
1309                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1310                kfree(pdev->rom_attr);
1311        }
1312
1313        pci_remove_firmware_label_files(pdev);
1314
1315}
1316
1317static int __init pci_sysfs_init(void)
1318{
1319        struct pci_dev *pdev = NULL;
1320        int retval;
1321
1322        sysfs_initialized = 1;
1323        for_each_pci_dev(pdev) {
1324                retval = pci_create_sysfs_dev_files(pdev);
1325                if (retval) {
1326                        pci_dev_put(pdev);
1327                        return retval;
1328                }
1329        }
1330
1331        return 0;
1332}
1333
1334late_initcall(pci_sysfs_init);
1335