drivers/pci/pci-sysfs.c

   1 /*
   2  * drivers/pci/pci-sysfs.c
   3  *
   4  * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
   5  * (C) Copyright 2002-2004 IBM Corp.
   6  * (C) Copyright 2003 Matthew Wilcox
   7  * (C) Copyright 2003 Hewlett-Packard
   8  * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
   9  * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
  10  *
  11  * File attributes for PCI devices
  12  *
  13  * Modeled after usb's driverfs.c
  14  *
  15  */
  16
  17
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/pci.h>
  21 #include <linux/stat.h>
  22 #include <linux/topology.h>
  23 #include <linux/mm.h>
  24 #include <linux/fs.h>
  25 #include <linux/capability.h>
  26 #include <linux/security.h>
  27 #include <linux/pci-aspm.h>
  28 #include <linux/slab.h>
  29 #include "pci.h"
  30
  31 static int sysfs_initialized;   /* = 0 */
  32
  33 /* show configuration fields */
  34 #define pci_config_attr(field, format_string)                           \
  35 static ssize_t                                                          \
  36 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  37 {                                                                       \
  38         struct pci_dev *pdev;                                           \
  39                                                                         \
  40         pdev = to_pci_dev (dev);                                        \
  41         return sprintf (buf, format_string, pdev->field);               \
  42 }
  43
  44 pci_config_attr(vendor, "0x%04x\n");
  45 pci_config_attr(device, "0x%04x\n");
  46 pci_config_attr(subsystem_vendor, "0x%04x\n");
  47 pci_config_attr(subsystem_device, "0x%04x\n");
  48 pci_config_attr(class, "0x%06x\n");
  49 pci_config_attr(irq, "%u\n");
  50
  51 static ssize_t broken_parity_status_show(struct device *dev,
  52                                          struct device_attribute *attr,
  53                                          char *buf)
  54 {
  55         struct pci_dev *pdev = to_pci_dev(dev);
  56         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  57 }
  58
  59 static ssize_t broken_parity_status_store(struct device *dev,
  60                                           struct device_attribute *attr,
  61                                           const char *buf, size_t count)
  62 {
  63         struct pci_dev *pdev = to_pci_dev(dev);
  64         unsigned long val;
  65
  66         if (strict_strtoul(buf, 0, &val) < 0)
  67                 return -EINVAL;
  68
  69         pdev->broken_parity_status = !!val;
  70
  71         return count;
  72 }
  73
  74 static ssize_t local_cpus_show(struct device *dev,
  75                         struct device_attribute *attr, char *buf)
  76 {
  77         const struct cpumask *mask;
  78         int len;
  79
  80 #ifdef CONFIG_NUMA
  81         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
  82                                           cpumask_of_node(dev_to_node(dev));
  83 #else
  84         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
  85 #endif
  86         len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  87         buf[len++] = '\n';
  88         buf[len] = '\0';
  89         return len;
  90 }
  91
  92
  93 static ssize_t local_cpulist_show(struct device *dev,
  94                         struct device_attribute *attr, char *buf)
  95 {
  96         const struct cpumask *mask;
  97         int len;
  98
  99 #ifdef CONFIG_NUMA
 100         mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
 101                                           cpumask_of_node(dev_to_node(dev));
 102 #else
 103         mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
 104 #endif
 105         len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
 106         buf[len++] = '\n';
 107         buf[len] = '\0';
 108         return len;
 109 }
 110
 111 /* show resources */
 112 static ssize_t
 113 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 114 {
 115         struct pci_dev * pci_dev = to_pci_dev(dev);
 116         char * str = buf;
 117         int i;
 118         int max;
 119         resource_size_t start, end;
 120
 121         if (pci_dev->subordinate)
 122                 max = DEVICE_COUNT_RESOURCE;
 123         else
 124                 max = PCI_BRIDGE_RESOURCES;
 125
 126         for (i = 0; i < max; i++) {
 127                 struct resource *res =  &pci_dev->resource[i];
 128                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 129                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 130                                (unsigned long long)start,
 131                                (unsigned long long)end,
 132                                (unsigned long long)res->flags);
 133         }
 134         return (str - buf);
 135 }
 136
 137 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 138 {
 139         struct pci_dev *pci_dev = to_pci_dev(dev);
 140
 141         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 142                        pci_dev->vendor, pci_dev->device,
 143                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 144                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 145                        (u8)(pci_dev->class));
 146 }
 147
 148 static ssize_t is_enabled_store(struct device *dev,
 149                                 struct device_attribute *attr, const char *buf,
 150                                 size_t count)
 151 {
 152         struct pci_dev *pdev = to_pci_dev(dev);
 153         unsigned long val;
 154         ssize_t result = strict_strtoul(buf, 0, &val);
 155
 156         if (result < 0)
 157                 return result;
 158
 159         /* this can crash the machine when done on the "wrong" device */
 160         if (!capable(CAP_SYS_ADMIN))
 161                 return -EPERM;
 162
 163         if (!val) {
 164                 if (pci_is_enabled(pdev))
 165                         pci_disable_device(pdev);
 166                 else
 167                         result = -EIO;
 168         } else
 169                 result = pci_enable_device(pdev);
 170
 171         return result < 0 ? result : count;
 172 }
 173
 174 static ssize_t is_enabled_show(struct device *dev,
 175                                struct device_attribute *attr, char *buf)
 176 {
 177         struct pci_dev *pdev;
 178
 179         pdev = to_pci_dev (dev);
 180         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 181 }
 182
 183 #ifdef CONFIG_NUMA
 184 static ssize_t
 185 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 186 {
 187         return sprintf (buf, "%d\n", dev->numa_node);
 188 }
 189 #endif
 190
 191 static ssize_t
 192 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
 193 {
 194         struct pci_dev *pdev = to_pci_dev(dev);
 195
 196         return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
 197 }
 198
 199 static ssize_t
 200 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
 201                                  char *buf)
 202 {
 203         return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
 204 }
 205
 206 static ssize_t
 207 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 208 {
 209         struct pci_dev *pdev = to_pci_dev(dev);
 210
 211         if (!pdev->subordinate)
 212                 return 0;
 213
 214         return sprintf (buf, "%u\n",
 215                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 216 }
 217
 218 static ssize_t
 219 msi_bus_store(struct device *dev, struct device_attribute *attr,
 220               const char *buf, size_t count)
 221 {
 222         struct pci_dev *pdev = to_pci_dev(dev);
 223         unsigned long val;
 224
 225         if (strict_strtoul(buf, 0, &val) < 0)
 226                 return -EINVAL;
 227
 228         /* bad things may happen if the no_msi flag is changed
 229          * while some drivers are loaded */
 230         if (!capable(CAP_SYS_ADMIN))
 231                 return -EPERM;
 232
 233         /* Maybe pci devices without subordinate busses shouldn't even have this
 234          * attribute in the first place?  */
 235         if (!pdev->subordinate)
 236                 return count;
 237
 238         /* Is the flag going to change, or keep the value it already had? */
 239         if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 240             !!val) {
 241                 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 242
 243                 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 244                          " bad things could happen\n", val ? "" : " not");
 245         }
 246
 247         return count;
 248 }
 249
 250 #ifdef CONFIG_HOTPLUG
 251 static DEFINE_MUTEX(pci_remove_rescan_mutex);
 252 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 253                                 size_t count)
 254 {
 255         unsigned long val;
 256         struct pci_bus *b = NULL;
 257
 258         if (strict_strtoul(buf, 0, &val) < 0)
 259                 return -EINVAL;
 260
 261         if (val) {
 262                 mutex_lock(&pci_remove_rescan_mutex);
 263                 while ((b = pci_find_next_bus(b)) != NULL)
 264                         pci_rescan_bus(b);
 265                 mutex_unlock(&pci_remove_rescan_mutex);
 266         }
 267         return count;
 268 }
 269
 270 struct bus_attribute pci_bus_attrs[] = {
 271         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
 272         __ATTR_NULL
 273 };
 274
 275 static ssize_t
 276 dev_rescan_store(struct device *dev, struct device_attribute *attr,
 277                  const char *buf, size_t count)
 278 {
 279         unsigned long val;
 280         struct pci_dev *pdev = to_pci_dev(dev);
 281
 282         if (strict_strtoul(buf, 0, &val) < 0)
 283                 return -EINVAL;
 284
 285         if (val) {
 286                 mutex_lock(&pci_remove_rescan_mutex);
 287                 pci_rescan_bus(pdev->bus);
 288                 mutex_unlock(&pci_remove_rescan_mutex);
 289         }
 290         return count;
 291 }
 292
 293 static void remove_callback(struct device *dev)
 294 {
 295         struct pci_dev *pdev = to_pci_dev(dev);
 296
 297         mutex_lock(&pci_remove_rescan_mutex);
 298         pci_remove_bus_device(pdev);
 299         mutex_unlock(&pci_remove_rescan_mutex);
 300 }
 301
 302 static ssize_t
 303 remove_store(struct device *dev, struct device_attribute *dummy,
 304              const char *buf, size_t count)
 305 {
 306         int ret = 0;
 307         unsigned long val;
 308
 309         if (strict_strtoul(buf, 0, &val) < 0)
 310                 return -EINVAL;
 311
 312         /* An attribute cannot be unregistered by one of its own methods,
 313          * so we have to use this roundabout approach.
 314          */
 315         if (val)
 316                 ret = device_schedule_callback(dev, remove_callback);
 317         if (ret)
 318                 count = ret;
 319         return count;
 320 }
 321 #endif
 322
 323 struct device_attribute pci_dev_attrs[] = {
 324         __ATTR_RO(resource),
 325         __ATTR_RO(vendor),
 326         __ATTR_RO(device),
 327         __ATTR_RO(subsystem_vendor),
 328         __ATTR_RO(subsystem_device),
 329         __ATTR_RO(class),
 330         __ATTR_RO(irq),
 331         __ATTR_RO(local_cpus),
 332         __ATTR_RO(local_cpulist),
 333         __ATTR_RO(modalias),
 334 #ifdef CONFIG_NUMA
 335         __ATTR_RO(numa_node),
 336 #endif
 337         __ATTR_RO(dma_mask_bits),
 338         __ATTR_RO(consistent_dma_mask_bits),
 339         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 340         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 341                 broken_parity_status_show,broken_parity_status_store),
 342         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 343 #ifdef CONFIG_HOTPLUG
 344         __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
 345         __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
 346 #endif
 347         __ATTR_NULL,
 348 };
 349
 350 static ssize_t
 351 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 352 {
 353         struct pci_dev *pdev = to_pci_dev(dev);
 354
 355         return sprintf(buf, "%u\n",
 356                 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
 357                    IORESOURCE_ROM_SHADOW));
 358 }
 359 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
 360
 361 static ssize_t
 362 pci_read_config(struct file *filp, struct kobject *kobj,
 363                 struct bin_attribute *bin_attr,
 364                 char *buf, loff_t off, size_t count)
 365 {
 366         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 367         unsigned int size = 64;
 368         loff_t init_off = off;
 369         u8 *data = (u8*) buf;
 370
 371         /* Several chips lock up trying to read undefined config space */
 372         if (security_capable(&init_user_ns, filp->f_cred, CAP_SYS_ADMIN) == 0) {
 373                 size = dev->cfg_size;
 374         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 375                 size = 128;
 376         }
 377
 378         if (off > size)
 379                 return 0;
 380         if (off + count > size) {
 381                 size -= off;
 382                 count = size;
 383         } else {
 384                 size = count;
 385         }
 386
 387         if ((off & 1) && size) {
 388                 u8 val;
 389                 pci_user_read_config_byte(dev, off, &val);
 390                 data[off - init_off] = val;
 391                 off++;
 392                 size--;
 393         }
 394
 395         if ((off & 3) && size > 2) {
 396                 u16 val;
 397                 pci_user_read_config_word(dev, off, &val);
 398                 data[off - init_off] = val & 0xff;
 399                 data[off - init_off + 1] = (val >> 8) & 0xff;
 400                 off += 2;
 401                 size -= 2;
 402         }
 403
 404         while (size > 3) {
 405                 u32 val;
 406                 pci_user_read_config_dword(dev, off, &val);
 407                 data[off - init_off] = val & 0xff;
 408                 data[off - init_off + 1] = (val >> 8) & 0xff;
 409                 data[off - init_off + 2] = (val >> 16) & 0xff;
 410                 data[off - init_off + 3] = (val >> 24) & 0xff;
 411                 off += 4;
 412                 size -= 4;
 413         }
 414
 415         if (size >= 2) {
 416                 u16 val;
 417                 pci_user_read_config_word(dev, off, &val);
 418                 data[off - init_off] = val & 0xff;
 419                 data[off - init_off + 1] = (val >> 8) & 0xff;
 420                 off += 2;
 421                 size -= 2;
 422         }
 423
 424         if (size > 0) {
 425                 u8 val;
 426                 pci_user_read_config_byte(dev, off, &val);
 427                 data[off - init_off] = val;
 428                 off++;
 429                 --size;
 430         }
 431
 432         return count;
 433 }
 434
 435 static ssize_t
 436 pci_write_config(struct file* filp, struct kobject *kobj,
 437                  struct bin_attribute *bin_attr,
 438                  char *buf, loff_t off, size_t count)
 439 {
 440         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 441         unsigned int size = count;
 442         loff_t init_off = off;
 443         u8 *data = (u8*) buf;
 444
 445         if (off > dev->cfg_size)
 446                 return 0;
 447         if (off + count > dev->cfg_size) {
 448                 size = dev->cfg_size - off;
 449                 count = size;
 450         }
 451
 452         if ((off & 1) && size) {
 453                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 454                 off++;
 455                 size--;
 456         }
 457
 458         if ((off & 3) && size > 2) {
 459                 u16 val = data[off - init_off];
 460                 val |= (u16) data[off - init_off + 1] << 8;
 461                 pci_user_write_config_word(dev, off, val);
 462                 off += 2;
 463                 size -= 2;
 464         }
 465
 466         while (size > 3) {
 467                 u32 val = data[off - init_off];
 468                 val |= (u32) data[off - init_off + 1] << 8;
 469                 val |= (u32) data[off - init_off + 2] << 16;
 470                 val |= (u32) data[off - init_off + 3] << 24;
 471                 pci_user_write_config_dword(dev, off, val);
 472                 off += 4;
 473                 size -= 4;
 474         }
 475
 476         if (size >= 2) {
 477                 u16 val = data[off - init_off];
 478                 val |= (u16) data[off - init_off + 1] << 8;
 479                 pci_user_write_config_word(dev, off, val);
 480                 off += 2;
 481                 size -= 2;
 482         }
 483
 484         if (size) {
 485                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 486                 off++;
 487                 --size;
 488         }
 489
 490         return count;
 491 }
 492
 493 static ssize_t
 494 read_vpd_attr(struct file *filp, struct kobject *kobj,
 495               struct bin_attribute *bin_attr,
 496               char *buf, loff_t off, size_t count)
 497 {
 498         struct pci_dev *dev =
 499                 to_pci_dev(container_of(kobj, struct device, kobj));
 500
 501         if (off > bin_attr->size)
 502                 count = 0;
 503         else if (count > bin_attr->size - off)
 504                 count = bin_attr->size - off;
 505
 506         return pci_read_vpd(dev, off, count, buf);
 507 }
 508
 509 static ssize_t
 510 write_vpd_attr(struct file *filp, struct kobject *kobj,
 511                struct bin_attribute *bin_attr,
 512                char *buf, loff_t off, size_t count)
 513 {
 514         struct pci_dev *dev =
 515                 to_pci_dev(container_of(kobj, struct device, kobj));
 516
 517         if (off > bin_attr->size)
 518                 count = 0;
 519         else if (count > bin_attr->size - off)
 520                 count = bin_attr->size - off;
 521
 522         return pci_write_vpd(dev, off, count, buf);
 523 }
 524
 525 #ifdef HAVE_PCI_LEGACY
 526 /**
 527  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 528  * @filp: open sysfs file
 529  * @kobj: kobject corresponding to file to read from
 530  * @bin_attr: struct bin_attribute for this file
 531  * @buf: buffer to store results
 532  * @off: offset into legacy I/O port space
 533  * @count: number of bytes to read
 534  *
 535  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 536  * callback routine (pci_legacy_read).
 537  */
 538 static ssize_t
 539 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
 540                    struct bin_attribute *bin_attr,
 541                    char *buf, loff_t off, size_t count)
 542 {
 543         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 544                                                       struct device,
 545                                                       kobj));
 546
 547         /* Only support 1, 2 or 4 byte accesses */
 548         if (count != 1 && count != 2 && count != 4)
 549                 return -EINVAL;
 550
 551         return pci_legacy_read(bus, off, (u32 *)buf, count);
 552 }
 553
 554 /**
 555  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 556  * @filp: open sysfs file
 557  * @kobj: kobject corresponding to file to read from
 558  * @bin_attr: struct bin_attribute for this file
 559  * @buf: buffer containing value to be written
 560  * @off: offset into legacy I/O port space
 561  * @count: number of bytes to write
 562  *
 563  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 564  * callback routine (pci_legacy_write).
 565  */
 566 static ssize_t
 567 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
 568                     struct bin_attribute *bin_attr,
 569                     char *buf, loff_t off, size_t count)
 570 {
 571         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 572                                                       struct device,
 573                                                       kobj));
 574         /* Only support 1, 2 or 4 byte accesses */
 575         if (count != 1 && count != 2 && count != 4)
 576                 return -EINVAL;
 577
 578         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 579 }
 580
 581 /**
 582  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 583  * @filp: open sysfs file
 584  * @kobj: kobject corresponding to device to be mapped
 585  * @attr: struct bin_attribute for this file
 586  * @vma: struct vm_area_struct passed to mmap
 587  *
 588  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 589  * legacy memory space (first meg of bus space) into application virtual
 590  * memory space.
 591  */
 592 static int
 593 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
 594                     struct bin_attribute *attr,
 595                     struct vm_area_struct *vma)
 596 {
 597         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 598                                                       struct device,
 599                                                       kobj));
 600
 601         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 602 }
 603
 604 /**
 605  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 606  * @filp: open sysfs file
 607  * @kobj: kobject corresponding to device to be mapped
 608  * @attr: struct bin_attribute for this file
 609  * @vma: struct vm_area_struct passed to mmap
 610  *
 611  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 612  * legacy IO space (first meg of bus space) into application virtual
 613  * memory space. Returns -ENOSYS if the operation isn't supported
 614  */
 615 static int
 616 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
 617                    struct bin_attribute *attr,
 618                    struct vm_area_struct *vma)
 619 {
 620         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 621                                                       struct device,
 622                                                       kobj));
 623
 624         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 625 }
 626
 627 /**
 628  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 629  * @b: bus to create files under
 630  * @mmap_type: I/O port or memory
 631  *
 632  * Stub implementation. Can be overridden by arch if necessary.
 633  */
 634 void __weak
 635 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
 636 {
 637         return;
 638 }
 639
 640 /**
 641  * pci_create_legacy_files - create legacy I/O port and memory files
 642  * @b: bus to create files under
 643  *
 644  * Some platforms allow access to legacy I/O port and ISA memory space on
 645  * a per-bus basis.  This routine creates the files and ties them into
 646  * their associated read, write and mmap files from pci-sysfs.c
 647  *
 648  * On error unwind, but don't propagate the error to the caller
 649  * as it is ok to set up the PCI bus without these files.
 650  */
 651 void pci_create_legacy_files(struct pci_bus *b)
 652 {
 653         int error;
 654
 655         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 656                                GFP_ATOMIC);
 657         if (!b->legacy_io)
 658                 goto kzalloc_err;
 659
 660         sysfs_bin_attr_init(b->legacy_io);
 661         b->legacy_io->attr.name = "legacy_io";
 662         b->legacy_io->size = 0xffff;
 663         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 664         b->legacy_io->read = pci_read_legacy_io;
 665         b->legacy_io->write = pci_write_legacy_io;
 666         b->legacy_io->mmap = pci_mmap_legacy_io;
 667         pci_adjust_legacy_attr(b, pci_mmap_io);
 668         error = device_create_bin_file(&b->dev, b->legacy_io);
 669         if (error)
 670                 goto legacy_io_err;
 671
 672         /* Allocated above after the legacy_io struct */
 673         b->legacy_mem = b->legacy_io + 1;
 674         sysfs_bin_attr_init(b->legacy_mem);
 675         b->legacy_mem->attr.name = "legacy_mem";
 676         b->legacy_mem->size = 1024*1024;
 677         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 678         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 679         pci_adjust_legacy_attr(b, pci_mmap_mem);
 680         error = device_create_bin_file(&b->dev, b->legacy_mem);
 681         if (error)
 682                 goto legacy_mem_err;
 683
 684         return;
 685
 686 legacy_mem_err:
 687         device_remove_bin_file(&b->dev, b->legacy_io);
 688 legacy_io_err:
 689         kfree(b->legacy_io);
 690         b->legacy_io = NULL;
 691 kzalloc_err:
 692         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 693                "and ISA memory resources to sysfs\n");
 694         return;
 695 }
 696
 697 void pci_remove_legacy_files(struct pci_bus *b)
 698 {
 699         if (b->legacy_io) {
 700                 device_remove_bin_file(&b->dev, b->legacy_io);
 701                 device_remove_bin_file(&b->dev, b->legacy_mem);
 702                 kfree(b->legacy_io); /* both are allocated here */
 703         }
 704 }
 705 #endif /* HAVE_PCI_LEGACY */
 706
 707 #ifdef HAVE_PCI_MMAP
 708
 709 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
 710                   enum pci_mmap_api mmap_api)
 711 {
 712         unsigned long nr, start, size, pci_start;
 713
 714         if (pci_resource_len(pdev, resno) == 0)
 715                 return 0;
 716         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 717         start = vma->vm_pgoff;
 718         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 719         pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
 720                         pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
 721         if (start >= pci_start && start < pci_start + size &&
 722                         start + nr <= pci_start + size)
 723                 return 1;
 724         return 0;
 725 }
 726
 727 /**
 728  * pci_mmap_resource - map a PCI resource into user memory space
 729  * @kobj: kobject for mapping
 730  * @attr: struct bin_attribute for the file being mapped
 731  * @vma: struct vm_area_struct passed into the mmap
 732  * @write_combine: 1 for write_combine mapping
 733  *
 734  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 735  */
 736 static int
 737 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 738                   struct vm_area_struct *vma, int write_combine)
 739 {
 740         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 741                                                        struct device, kobj));
 742         struct resource *res = attr->private;
 743         enum pci_mmap_state mmap_type;
 744         resource_size_t start, end;
 745         int i;
 746
 747         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 748                 if (res == &pdev->resource[i])
 749                         break;
 750         if (i >= PCI_ROM_RESOURCE)
 751                 return -ENODEV;
 752
 753         if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
 754                 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
 755                         "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
 756                         current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
 757                         pci_name(pdev), i,
 758                         (u64)pci_resource_start(pdev, i),
 759                         (u64)pci_resource_len(pdev, i));
 760                 return -EINVAL;
 761         }
 762
 763         /* pci_mmap_page_range() expects the same kind of entry as coming
 764          * from /proc/bus/pci/ which is a "user visible" value. If this is
 765          * different from the resource itself, arch will do necessary fixup.
 766          */
 767         pci_resource_to_user(pdev, i, res, &start, &end);
 768         vma->vm_pgoff += start >> PAGE_SHIFT;
 769         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 770
 771         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 772                 return -EINVAL;
 773
 774         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 775 }
 776
 777 static int
 778 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
 779                      struct bin_attribute *attr,
 780                      struct vm_area_struct *vma)
 781 {
 782         return pci_mmap_resource(kobj, attr, vma, 0);
 783 }
 784
 785 static int
 786 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
 787                      struct bin_attribute *attr,
 788                      struct vm_area_struct *vma)
 789 {
 790         return pci_mmap_resource(kobj, attr, vma, 1);
 791 }
 792
 793 static ssize_t
 794 pci_resource_io(struct file *filp, struct kobject *kobj,
 795                 struct bin_attribute *attr, char *buf,
 796                 loff_t off, size_t count, bool write)
 797 {
 798         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 799                                                        struct device, kobj));
 800         struct resource *res = attr->private;
 801         unsigned long port = off;
 802         int i;
 803
 804         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 805                 if (res == &pdev->resource[i])
 806                         break;
 807         if (i >= PCI_ROM_RESOURCE)
 808                 return -ENODEV;
 809
 810         port += pci_resource_start(pdev, i);
 811
 812         if (port > pci_resource_end(pdev, i))
 813                 return 0;
 814
 815         if (port + count - 1 > pci_resource_end(pdev, i))
 816                 return -EINVAL;
 817
 818         switch (count) {
 819         case 1:
 820                 if (write)
 821                         outb(*(u8 *)buf, port);
 822                 else
 823                         *(u8 *)buf = inb(port);
 824                 return 1;
 825         case 2:
 826                 if (write)
 827                         outw(*(u16 *)buf, port);
 828                 else
 829                         *(u16 *)buf = inw(port);
 830                 return 2;
 831         case 4:
 832                 if (write)
 833                         outl(*(u32 *)buf, port);
 834                 else
 835                         *(u32 *)buf = inl(port);
 836                 return 4;
 837         }
 838         return -EINVAL;
 839 }
 840
 841 static ssize_t
 842 pci_read_resource_io(struct file *filp, struct kobject *kobj,
 843                      struct bin_attribute *attr, char *buf,
 844                      loff_t off, size_t count)
 845 {
 846         return pci_resource_io(filp, kobj, attr, buf, off, count, false);
 847 }
 848
 849 static ssize_t
 850 pci_write_resource_io(struct file *filp, struct kobject *kobj,
 851                       struct bin_attribute *attr, char *buf,
 852                       loff_t off, size_t count)
 853 {
 854         return pci_resource_io(filp, kobj, attr, buf, off, count, true);
 855 }
 856
 857 /**
 858  * pci_remove_resource_files - cleanup resource files
 859  * @pdev: dev to cleanup
 860  *
 861  * If we created resource files for @pdev, remove them from sysfs and
 862  * free their resources.
 863  */
 864 static void
 865 pci_remove_resource_files(struct pci_dev *pdev)
 866 {
 867         int i;
 868
 869         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 870                 struct bin_attribute *res_attr;
 871
 872                 res_attr = pdev->res_attr[i];
 873                 if (res_attr) {
 874                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 875                         kfree(res_attr);
 876                 }
 877
 878                 res_attr = pdev->res_attr_wc[i];
 879                 if (res_attr) {
 880                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 881                         kfree(res_attr);
 882                 }
 883         }
 884 }
 885
 886 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 887 {
 888         /* allocate attribute structure, piggyback attribute name */
 889         int name_len = write_combine ? 13 : 10;
 890         struct bin_attribute *res_attr;
 891         int retval;
 892
 893         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 894         if (res_attr) {
 895                 char *res_attr_name = (char *)(res_attr + 1);
 896
 897                 sysfs_bin_attr_init(res_attr);
 898                 if (write_combine) {
 899                         pdev->res_attr_wc[num] = res_attr;
 900                         sprintf(res_attr_name, "resource%d_wc", num);
 901                         res_attr->mmap = pci_mmap_resource_wc;
 902                 } else {
 903                         pdev->res_attr[num] = res_attr;
 904                         sprintf(res_attr_name, "resource%d", num);
 905                         res_attr->mmap = pci_mmap_resource_uc;
 906                 }
 907                 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
 908                         res_attr->read = pci_read_resource_io;
 909                         res_attr->write = pci_write_resource_io;
 910                 }
 911                 res_attr->attr.name = res_attr_name;
 912                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 913                 res_attr->size = pci_resource_len(pdev, num);
 914                 res_attr->private = &pdev->resource[num];
 915                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 916         } else
 917                 retval = -ENOMEM;
 918
 919         return retval;
 920 }
 921
 922 /**
 923  * pci_create_resource_files - create resource files in sysfs for @dev
 924  * @pdev: dev in question
 925  *
 926  * Walk the resources in @pdev creating files for each resource available.
 927  */
 928 static int pci_create_resource_files(struct pci_dev *pdev)
 929 {
 930         int i;
 931         int retval;
 932
 933         /* Expose the PCI resources from this device as files */
 934         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 935
 936                 /* skip empty resources */
 937                 if (!pci_resource_len(pdev, i))
 938                         continue;
 939
 940                 retval = pci_create_attr(pdev, i, 0);
 941                 /* for prefetchable resources, create a WC mappable file */
 942                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 943                         retval = pci_create_attr(pdev, i, 1);
 944
 945                 if (retval) {
 946                         pci_remove_resource_files(pdev);
 947                         return retval;
 948                 }
 949         }
 950         return 0;
 951 }
 952 #else /* !HAVE_PCI_MMAP */
 953 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
 954 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
 955 #endif /* HAVE_PCI_MMAP */
 956
 957 /**
 958  * pci_write_rom - used to enable access to the PCI ROM display
 959  * @filp: sysfs file
 960  * @kobj: kernel object handle
 961  * @bin_attr: struct bin_attribute for this file
 962  * @buf: user input
 963  * @off: file offset
 964  * @count: number of byte in input
 965  *
 966  * writing anything except 0 enables it
 967  */
 968 static ssize_t
 969 pci_write_rom(struct file *filp, struct kobject *kobj,
 970               struct bin_attribute *bin_attr,
 971               char *buf, loff_t off, size_t count)
 972 {
 973         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 974
 975         if ((off ==  0) && (*buf == '0') && (count == 2))
 976                 pdev->rom_attr_enabled = 0;
 977         else
 978                 pdev->rom_attr_enabled = 1;
 979
 980         return count;
 981 }
 982
 983 /**
 984  * pci_read_rom - read a PCI ROM
 985  * @filp: sysfs file
 986  * @kobj: kernel object handle
 987  * @bin_attr: struct bin_attribute for this file
 988  * @buf: where to put the data we read from the ROM
 989  * @off: file offset
 990  * @count: number of bytes to read
 991  *
 992  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 993  * device corresponding to @kobj.
 994  */
 995 static ssize_t
 996 pci_read_rom(struct file *filp, struct kobject *kobj,
 997              struct bin_attribute *bin_attr,
 998              char *buf, loff_t off, size_t count)
 999 {
1000         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1001         void __iomem *rom;
1002         size_t size;
1003
1004         if (!pdev->rom_attr_enabled)
1005                 return -EINVAL;
1006
1007         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1008         if (!rom || !size)
1009                 return -EIO;
1010
1011         if (off >= size)
1012                 count = 0;
1013         else {
1014                 if (off + count > size)
1015                         count = size - off;
1016
1017                 memcpy_fromio(buf, rom + off, count);
1018         }
1019         pci_unmap_rom(pdev, rom);
1020
1021         return count;
1022 }
1023
1024 static struct bin_attribute pci_config_attr = {
1025         .attr = {
1026                 .name = "config",
1027                 .mode = S_IRUGO | S_IWUSR,
1028         },
1029         .size = PCI_CFG_SPACE_SIZE,
1030         .read = pci_read_config,
1031         .write = pci_write_config,
1032 };
1033
1034 static struct bin_attribute pcie_config_attr = {
1035         .attr = {
1036                 .name = "config",
1037                 .mode = S_IRUGO | S_IWUSR,
1038         },
1039         .size = PCI_CFG_SPACE_EXP_SIZE,
1040         .read = pci_read_config,
1041         .write = pci_write_config,
1042 };
1043
1044 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1045 {
1046         return 0;
1047 }
1048
1049 static ssize_t reset_store(struct device *dev,
1050                            struct device_attribute *attr, const char *buf,
1051                            size_t count)
1052 {
1053         struct pci_dev *pdev = to_pci_dev(dev);
1054         unsigned long val;
1055         ssize_t result = strict_strtoul(buf, 0, &val);
1056
1057         if (result < 0)
1058                 return result;
1059
1060         if (val != 1)
1061                 return -EINVAL;
1062
1063         result = pci_reset_function(pdev);
1064         if (result < 0)
1065                 return result;
1066
1067         return count;
1068 }
1069
1070 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1071
1072 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1073 {
1074         int retval;
1075         struct bin_attribute *attr;
1076
1077         /* If the device has VPD, try to expose it in sysfs. */
1078         if (dev->vpd) {
1079                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1080                 if (!attr)
1081                         return -ENOMEM;
1082
1083                 sysfs_bin_attr_init(attr);
1084                 attr->size = dev->vpd->len;
1085                 attr->attr.name = "vpd";
1086                 attr->attr.mode = S_IRUSR | S_IWUSR;
1087                 attr->read = read_vpd_attr;
1088                 attr->write = write_vpd_attr;
1089                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1090                 if (retval) {
1091                         kfree(attr);
1092                         return retval;
1093                 }
1094                 dev->vpd->attr = attr;
1095         }
1096
1097         /* Active State Power Management */
1098         pcie_aspm_create_sysfs_dev_files(dev);
1099
1100         if (!pci_probe_reset_function(dev)) {
1101                 retval = device_create_file(&dev->dev, &reset_attr);
1102                 if (retval)
1103                         goto error;
1104                 dev->reset_fn = 1;
1105         }
1106         return 0;
1107
1108 error:
1109         pcie_aspm_remove_sysfs_dev_files(dev);
1110         if (dev->vpd && dev->vpd->attr) {
1111                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1112                 kfree(dev->vpd->attr);
1113         }
1114
1115         return retval;
1116 }
1117
1118 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1119 {
1120         int retval;
1121         int rom_size = 0;
1122         struct bin_attribute *attr;
1123
1124         if (!sysfs_initialized)
1125                 return -EACCES;
1126
1127         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1128                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1129         else
1130                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1131         if (retval)
1132                 goto err;
1133
1134         retval = pci_create_resource_files(pdev);
1135         if (retval)
1136                 goto err_config_file;
1137
1138         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1139                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1140         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1141                 rom_size = 0x20000;
1142
1143         /* If the device has a ROM, try to expose it in sysfs. */
1144         if (rom_size) {
1145                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1146                 if (!attr) {
1147                         retval = -ENOMEM;
1148                         goto err_resource_files;
1149                 }
1150                 sysfs_bin_attr_init(attr);
1151                 attr->size = rom_size;
1152                 attr->attr.name = "rom";
1153                 attr->attr.mode = S_IRUSR | S_IWUSR;
1154                 attr->read = pci_read_rom;
1155                 attr->write = pci_write_rom;
1156                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1157                 if (retval) {
1158                         kfree(attr);
1159                         goto err_resource_files;
1160                 }
1161                 pdev->rom_attr = attr;
1162         }
1163
1164         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1165                 retval = device_create_file(&pdev->dev, &vga_attr);
1166                 if (retval)
1167                         goto err_rom_file;
1168         }
1169
1170         /* add platform-specific attributes */
1171         retval = pcibios_add_platform_entries(pdev);
1172         if (retval)
1173                 goto err_vga_file;
1174
1175         /* add sysfs entries for various capabilities */
1176         retval = pci_create_capabilities_sysfs(pdev);
1177         if (retval)
1178                 goto err_vga_file;
1179
1180         pci_create_firmware_label_files(pdev);
1181
1182         return 0;
1183
1184 err_vga_file:
1185         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1186                 device_remove_file(&pdev->dev, &vga_attr);
1187 err_rom_file:
1188         if (rom_size) {
1189                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1190                 kfree(pdev->rom_attr);
1191                 pdev->rom_attr = NULL;
1192         }
1193 err_resource_files:
1194         pci_remove_resource_files(pdev);
1195 err_config_file:
1196         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1197                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1198         else
1199                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1200 err:
1201         return retval;
1202 }
1203
1204 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1205 {
1206         if (dev->vpd && dev->vpd->attr) {
1207                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1208                 kfree(dev->vpd->attr);
1209         }
1210
1211         pcie_aspm_remove_sysfs_dev_files(dev);
1212         if (dev->reset_fn) {
1213                 device_remove_file(&dev->dev, &reset_attr);
1214                 dev->reset_fn = 0;
1215         }
1216 }
1217
1218 /**
1219  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1220  * @pdev: device whose entries we should free
1221  *
1222  * Cleanup when @pdev is removed from sysfs.
1223  */
1224 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1225 {
1226         int rom_size = 0;
1227
1228         if (!sysfs_initialized)
1229                 return;
1230
1231         pci_remove_capabilities_sysfs(pdev);
1232
1233         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1234                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1235         else
1236                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1237
1238         pci_remove_resource_files(pdev);
1239
1240         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1241                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1242         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1243                 rom_size = 0x20000;
1244
1245         if (rom_size && pdev->rom_attr) {
1246                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1247                 kfree(pdev->rom_attr);
1248         }
1249
1250         pci_remove_firmware_label_files(pdev);
1251
1252 }
1253
1254 static int __init pci_sysfs_init(void)
1255 {
1256         struct pci_dev *pdev = NULL;
1257         int retval;
1258
1259         sysfs_initialized = 1;
1260         for_each_pci_dev(pdev) {
1261                 retval = pci_create_sysfs_dev_files(pdev);
1262                 if (retval) {
1263                         pci_dev_put(pdev);
1264                         return retval;
1265                 }
1266         }
1267
1268         return 0;
1269 }
1270
1271 late_initcall(pci_sysfs_init);