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/capability.h>
  25 #include <linux/pci-aspm.h>
  26 #include "pci.h"
  27
  28 static int sysfs_initialized;   /* = 0 */
  29
  30 /* show configuration fields */
  31 #define pci_config_attr(field, format_string)                           \
  32 static ssize_t                                                          \
  33 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  34 {                                                                       \
  35         struct pci_dev *pdev;                                           \
  36                                                                         \
  37         pdev = to_pci_dev (dev);                                        \
  38         return sprintf (buf, format_string, pdev->field);               \
  39 }
  40
  41 pci_config_attr(vendor, "0x%04x\n");
  42 pci_config_attr(device, "0x%04x\n");
  43 pci_config_attr(subsystem_vendor, "0x%04x\n");
  44 pci_config_attr(subsystem_device, "0x%04x\n");
  45 pci_config_attr(class, "0x%06x\n");
  46 pci_config_attr(irq, "%u\n");
  47
  48 static ssize_t broken_parity_status_show(struct device *dev,
  49                                          struct device_attribute *attr,
  50                                          char *buf)
  51 {
  52         struct pci_dev *pdev = to_pci_dev(dev);
  53         return sprintf (buf, "%u\n", pdev->broken_parity_status);
  54 }
  55
  56 static ssize_t broken_parity_status_store(struct device *dev,
  57                                           struct device_attribute *attr,
  58                                           const char *buf, size_t count)
  59 {
  60         struct pci_dev *pdev = to_pci_dev(dev);
  61         unsigned long val;
  62
  63         if (strict_strtoul(buf, 0, &val) < 0)
  64                 return -EINVAL;
  65
  66         pdev->broken_parity_status = !!val;
  67
  68         return count;
  69 }
  70
  71 static ssize_t local_cpus_show(struct device *dev,
  72                         struct device_attribute *attr, char *buf)
  73 {
  74         cpumask_t mask;
  75         int len;
  76
  77         mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
  78         len = cpumask_scnprintf(buf, PAGE_SIZE-2, &mask);
  79         buf[len++] = '\n';
  80         buf[len] = '\0';
  81         return len;
  82 }
  83
  84
  85 static ssize_t local_cpulist_show(struct device *dev,
  86                         struct device_attribute *attr, char *buf)
  87 {
  88         cpumask_t mask;
  89         int len;
  90
  91         mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
  92         len = cpulist_scnprintf(buf, PAGE_SIZE-2, &mask);
  93         buf[len++] = '\n';
  94         buf[len] = '\0';
  95         return len;
  96 }
  97
  98 /* show resources */
  99 static ssize_t
 100 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 101 {
 102         struct pci_dev * pci_dev = to_pci_dev(dev);
 103         char * str = buf;
 104         int i;
 105         int max;
 106         resource_size_t start, end;
 107
 108         if (pci_dev->subordinate)
 109                 max = DEVICE_COUNT_RESOURCE;
 110         else
 111                 max = PCI_BRIDGE_RESOURCES;
 112
 113         for (i = 0; i < max; i++) {
 114                 struct resource *res =  &pci_dev->resource[i];
 115                 pci_resource_to_user(pci_dev, i, res, &start, &end);
 116                 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
 117                                (unsigned long long)start,
 118                                (unsigned long long)end,
 119                                (unsigned long long)res->flags);
 120         }
 121         return (str - buf);
 122 }
 123
 124 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 125 {
 126         struct pci_dev *pci_dev = to_pci_dev(dev);
 127
 128         return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 129                        pci_dev->vendor, pci_dev->device,
 130                        pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 131                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 132                        (u8)(pci_dev->class));
 133 }
 134
 135 static ssize_t is_enabled_store(struct device *dev,
 136                                 struct device_attribute *attr, const char *buf,
 137                                 size_t count)
 138 {
 139         struct pci_dev *pdev = to_pci_dev(dev);
 140         unsigned long val;
 141         ssize_t result = strict_strtoul(buf, 0, &val);
 142
 143         if (result < 0)
 144                 return result;
 145
 146         /* this can crash the machine when done on the "wrong" device */
 147         if (!capable(CAP_SYS_ADMIN))
 148                 return -EPERM;
 149
 150         if (!val) {
 151                 if (atomic_read(&pdev->enable_cnt) != 0)
 152                         pci_disable_device(pdev);
 153                 else
 154                         result = -EIO;
 155         } else
 156                 result = pci_enable_device(pdev);
 157
 158         return result < 0 ? result : count;
 159 }
 160
 161 static ssize_t is_enabled_show(struct device *dev,
 162                                struct device_attribute *attr, char *buf)
 163 {
 164         struct pci_dev *pdev;
 165
 166         pdev = to_pci_dev (dev);
 167         return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
 168 }
 169
 170 #ifdef CONFIG_NUMA
 171 static ssize_t
 172 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
 173 {
 174         return sprintf (buf, "%d\n", dev->numa_node);
 175 }
 176 #endif
 177
 178 static ssize_t
 179 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 180 {
 181         struct pci_dev *pdev = to_pci_dev(dev);
 182
 183         if (!pdev->subordinate)
 184                 return 0;
 185
 186         return sprintf (buf, "%u\n",
 187                         !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
 188 }
 189
 190 static ssize_t
 191 msi_bus_store(struct device *dev, struct device_attribute *attr,
 192               const char *buf, size_t count)
 193 {
 194         struct pci_dev *pdev = to_pci_dev(dev);
 195         unsigned long val;
 196
 197         if (strict_strtoul(buf, 0, &val) < 0)
 198                 return -EINVAL;
 199
 200         /* bad things may happen if the no_msi flag is changed
 201          * while some drivers are loaded */
 202         if (!capable(CAP_SYS_ADMIN))
 203                 return -EPERM;
 204
 205         /* Maybe pci devices without subordinate busses shouldn't even have this
 206          * attribute in the first place?  */
 207         if (!pdev->subordinate)
 208                 return count;
 209
 210         /* Is the flag going to change, or keep the value it already had? */
 211         if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
 212             !!val) {
 213                 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
 214
 215                 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
 216                          " bad things could happen\n", val ? "" : " not");
 217         }
 218
 219         return count;
 220 }
 221
 222 struct device_attribute pci_dev_attrs[] = {
 223         __ATTR_RO(resource),
 224         __ATTR_RO(vendor),
 225         __ATTR_RO(device),
 226         __ATTR_RO(subsystem_vendor),
 227         __ATTR_RO(subsystem_device),
 228         __ATTR_RO(class),
 229         __ATTR_RO(irq),
 230         __ATTR_RO(local_cpus),
 231         __ATTR_RO(local_cpulist),
 232         __ATTR_RO(modalias),
 233 #ifdef CONFIG_NUMA
 234         __ATTR_RO(numa_node),
 235 #endif
 236         __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 237         __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 238                 broken_parity_status_show,broken_parity_status_store),
 239         __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
 240         __ATTR_NULL,
 241 };
 242
 243 static ssize_t
 244 pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 245                 char *buf, loff_t off, size_t count)
 246 {
 247         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 248         unsigned int size = 64;
 249         loff_t init_off = off;
 250         u8 *data = (u8*) buf;
 251
 252         /* Several chips lock up trying to read undefined config space */
 253         if (capable(CAP_SYS_ADMIN)) {
 254                 size = dev->cfg_size;
 255         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 256                 size = 128;
 257         }
 258
 259         if (off > size)
 260                 return 0;
 261         if (off + count > size) {
 262                 size -= off;
 263                 count = size;
 264         } else {
 265                 size = count;
 266         }
 267
 268         if ((off & 1) && size) {
 269                 u8 val;
 270                 pci_user_read_config_byte(dev, off, &val);
 271                 data[off - init_off] = val;
 272                 off++;
 273                 size--;
 274         }
 275
 276         if ((off & 3) && size > 2) {
 277                 u16 val;
 278                 pci_user_read_config_word(dev, off, &val);
 279                 data[off - init_off] = val & 0xff;
 280                 data[off - init_off + 1] = (val >> 8) & 0xff;
 281                 off += 2;
 282                 size -= 2;
 283         }
 284
 285         while (size > 3) {
 286                 u32 val;
 287                 pci_user_read_config_dword(dev, off, &val);
 288                 data[off - init_off] = val & 0xff;
 289                 data[off - init_off + 1] = (val >> 8) & 0xff;
 290                 data[off - init_off + 2] = (val >> 16) & 0xff;
 291                 data[off - init_off + 3] = (val >> 24) & 0xff;
 292                 off += 4;
 293                 size -= 4;
 294         }
 295
 296         if (size >= 2) {
 297                 u16 val;
 298                 pci_user_read_config_word(dev, off, &val);
 299                 data[off - init_off] = val & 0xff;
 300                 data[off - init_off + 1] = (val >> 8) & 0xff;
 301                 off += 2;
 302                 size -= 2;
 303         }
 304
 305         if (size > 0) {
 306                 u8 val;
 307                 pci_user_read_config_byte(dev, off, &val);
 308                 data[off - init_off] = val;
 309                 off++;
 310                 --size;
 311         }
 312
 313         return count;
 314 }
 315
 316 static ssize_t
 317 pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
 318                  char *buf, loff_t off, size_t count)
 319 {
 320         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 321         unsigned int size = count;
 322         loff_t init_off = off;
 323         u8 *data = (u8*) buf;
 324
 325         if (off > dev->cfg_size)
 326                 return 0;
 327         if (off + count > dev->cfg_size) {
 328                 size = dev->cfg_size - off;
 329                 count = size;
 330         }
 331
 332         if ((off & 1) && size) {
 333                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 334                 off++;
 335                 size--;
 336         }
 337
 338         if ((off & 3) && size > 2) {
 339                 u16 val = data[off - init_off];
 340                 val |= (u16) data[off - init_off + 1] << 8;
 341                 pci_user_write_config_word(dev, off, val);
 342                 off += 2;
 343                 size -= 2;
 344         }
 345
 346         while (size > 3) {
 347                 u32 val = data[off - init_off];
 348                 val |= (u32) data[off - init_off + 1] << 8;
 349                 val |= (u32) data[off - init_off + 2] << 16;
 350                 val |= (u32) data[off - init_off + 3] << 24;
 351                 pci_user_write_config_dword(dev, off, val);
 352                 off += 4;
 353                 size -= 4;
 354         }
 355
 356         if (size >= 2) {
 357                 u16 val = data[off - init_off];
 358                 val |= (u16) data[off - init_off + 1] << 8;
 359                 pci_user_write_config_word(dev, off, val);
 360                 off += 2;
 361                 size -= 2;
 362         }
 363
 364         if (size) {
 365                 pci_user_write_config_byte(dev, off, data[off - init_off]);
 366                 off++;
 367                 --size;
 368         }
 369
 370         return count;
 371 }
 372
 373 static ssize_t
 374 pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
 375              char *buf, loff_t off, size_t count)
 376 {
 377         struct pci_dev *dev =
 378                 to_pci_dev(container_of(kobj, struct device, kobj));
 379         int end;
 380         int ret;
 381
 382         if (off > bin_attr->size)
 383                 count = 0;
 384         else if (count > bin_attr->size - off)
 385                 count = bin_attr->size - off;
 386         end = off + count;
 387
 388         while (off < end) {
 389                 ret = dev->vpd->ops->read(dev, off, end - off, buf);
 390                 if (ret < 0)
 391                         return ret;
 392                 buf += ret;
 393                 off += ret;
 394         }
 395
 396         return count;
 397 }
 398
 399 static ssize_t
 400 pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
 401               char *buf, loff_t off, size_t count)
 402 {
 403         struct pci_dev *dev =
 404                 to_pci_dev(container_of(kobj, struct device, kobj));
 405         int end;
 406         int ret;
 407
 408         if (off > bin_attr->size)
 409                 count = 0;
 410         else if (count > bin_attr->size - off)
 411                 count = bin_attr->size - off;
 412         end = off + count;
 413
 414         while (off < end) {
 415                 ret = dev->vpd->ops->write(dev, off, end - off, buf);
 416                 if (ret < 0)
 417                         return ret;
 418                 buf += ret;
 419                 off += ret;
 420         }
 421
 422         return count;
 423 }
 424
 425 #ifdef HAVE_PCI_LEGACY
 426 /**
 427  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 428  * @kobj: kobject corresponding to file to read from
 429  * @buf: buffer to store results
 430  * @off: offset into legacy I/O port space
 431  * @count: number of bytes to read
 432  *
 433  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 434  * callback routine (pci_legacy_read).
 435  */
 436 static ssize_t
 437 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 438                    char *buf, loff_t off, size_t count)
 439 {
 440         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 441                                                       struct device,
 442                                                       kobj));
 443
 444         /* Only support 1, 2 or 4 byte accesses */
 445         if (count != 1 && count != 2 && count != 4)
 446                 return -EINVAL;
 447
 448         return pci_legacy_read(bus, off, (u32 *)buf, count);
 449 }
 450
 451 /**
 452  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 453  * @kobj: kobject corresponding to file to read from
 454  * @buf: buffer containing value to be written
 455  * @off: offset into legacy I/O port space
 456  * @count: number of bytes to write
 457  *
 458  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 459  * callback routine (pci_legacy_write).
 460  */
 461 static ssize_t
 462 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
 463                     char *buf, loff_t off, size_t count)
 464 {
 465         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 466                                                       struct device,
 467                                                       kobj));
 468         /* Only support 1, 2 or 4 byte accesses */
 469         if (count != 1 && count != 2 && count != 4)
 470                 return -EINVAL;
 471
 472         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 473 }
 474
 475 /**
 476  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 477  * @kobj: kobject corresponding to device to be mapped
 478  * @attr: struct bin_attribute for this file
 479  * @vma: struct vm_area_struct passed to mmap
 480  *
 481  * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
 482  * legacy memory space (first meg of bus space) into application virtual
 483  * memory space.
 484  */
 485 static int
 486 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 487                     struct vm_area_struct *vma)
 488 {
 489         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 490                                                       struct device,
 491                                                       kobj));
 492
 493         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
 494 }
 495
 496 /**
 497  * pci_mmap_legacy_io - map legacy PCI IO into user memory space
 498  * @kobj: kobject corresponding to device to be mapped
 499  * @attr: struct bin_attribute for this file
 500  * @vma: struct vm_area_struct passed to mmap
 501  *
 502  * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 503  * legacy IO space (first meg of bus space) into application virtual
 504  * memory space. Returns -ENOSYS if the operation isn't supported
 505  */
 506 static int
 507 pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
 508                    struct vm_area_struct *vma)
 509 {
 510         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 511                                                       struct device,
 512                                                       kobj));
 513
 514         return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
 515 }
 516
 517 /**
 518  * pci_create_legacy_files - create legacy I/O port and memory files
 519  * @b: bus to create files under
 520  *
 521  * Some platforms allow access to legacy I/O port and ISA memory space on
 522  * a per-bus basis.  This routine creates the files and ties them into
 523  * their associated read, write and mmap files from pci-sysfs.c
 524  *
 525  * On error unwind, but don't propogate the error to the caller
 526  * as it is ok to set up the PCI bus without these files.
 527  */
 528 void pci_create_legacy_files(struct pci_bus *b)
 529 {
 530         int error;
 531
 532         b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
 533                                GFP_ATOMIC);
 534         if (!b->legacy_io)
 535                 goto kzalloc_err;
 536
 537         b->legacy_io->attr.name = "legacy_io";
 538         b->legacy_io->size = 0xffff;
 539         b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
 540         b->legacy_io->read = pci_read_legacy_io;
 541         b->legacy_io->write = pci_write_legacy_io;
 542         b->legacy_io->mmap = pci_mmap_legacy_io;
 543         error = device_create_bin_file(&b->dev, b->legacy_io);
 544         if (error)
 545                 goto legacy_io_err;
 546
 547         /* Allocated above after the legacy_io struct */
 548         b->legacy_mem = b->legacy_io + 1;
 549         b->legacy_mem->attr.name = "legacy_mem";
 550         b->legacy_mem->size = 1024*1024;
 551         b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
 552         b->legacy_mem->mmap = pci_mmap_legacy_mem;
 553         error = device_create_bin_file(&b->dev, b->legacy_mem);
 554         if (error)
 555                 goto legacy_mem_err;
 556
 557         return;
 558
 559 legacy_mem_err:
 560         device_remove_bin_file(&b->dev, b->legacy_io);
 561 legacy_io_err:
 562         kfree(b->legacy_io);
 563         b->legacy_io = NULL;
 564 kzalloc_err:
 565         printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
 566                "and ISA memory resources to sysfs\n");
 567         return;
 568 }
 569
 570 void pci_remove_legacy_files(struct pci_bus *b)
 571 {
 572         if (b->legacy_io) {
 573                 device_remove_bin_file(&b->dev, b->legacy_io);
 574                 device_remove_bin_file(&b->dev, b->legacy_mem);
 575                 kfree(b->legacy_io); /* both are allocated here */
 576         }
 577 }
 578 #endif /* HAVE_PCI_LEGACY */
 579
 580 #ifdef HAVE_PCI_MMAP
 581
 582 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
 583 {
 584         unsigned long nr, start, size;
 585
 586         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 587         start = vma->vm_pgoff;
 588         size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
 589         if (start < size && size - start >= nr)
 590                 return 1;
 591         WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
 592                 current->comm, start, start+nr, pci_name(pdev), resno, size);
 593         return 0;
 594 }
 595
 596 /**
 597  * pci_mmap_resource - map a PCI resource into user memory space
 598  * @kobj: kobject for mapping
 599  * @attr: struct bin_attribute for the file being mapped
 600  * @vma: struct vm_area_struct passed into the mmap
 601  * @write_combine: 1 for write_combine mapping
 602  *
 603  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 604  */
 605 static int
 606 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 607                   struct vm_area_struct *vma, int write_combine)
 608 {
 609         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 610                                                        struct device, kobj));
 611         struct resource *res = (struct resource *)attr->private;
 612         enum pci_mmap_state mmap_type;
 613         resource_size_t start, end;
 614         int i;
 615
 616         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 617                 if (res == &pdev->resource[i])
 618                         break;
 619         if (i >= PCI_ROM_RESOURCE)
 620                 return -ENODEV;
 621
 622         if (!pci_mmap_fits(pdev, i, vma))
 623                 return -EINVAL;
 624
 625         /* pci_mmap_page_range() expects the same kind of entry as coming
 626          * from /proc/bus/pci/ which is a "user visible" value. If this is
 627          * different from the resource itself, arch will do necessary fixup.
 628          */
 629         pci_resource_to_user(pdev, i, res, &start, &end);
 630         vma->vm_pgoff += start >> PAGE_SHIFT;
 631         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 632
 633         if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
 634                 return -EINVAL;
 635
 636         return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
 637 }
 638
 639 static int
 640 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
 641                      struct vm_area_struct *vma)
 642 {
 643         return pci_mmap_resource(kobj, attr, vma, 0);
 644 }
 645
 646 static int
 647 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
 648                      struct vm_area_struct *vma)
 649 {
 650         return pci_mmap_resource(kobj, attr, vma, 1);
 651 }
 652
 653 /**
 654  * pci_remove_resource_files - cleanup resource files
 655  * @dev: dev to cleanup
 656  *
 657  * If we created resource files for @dev, remove them from sysfs and
 658  * free their resources.
 659  */
 660 static void
 661 pci_remove_resource_files(struct pci_dev *pdev)
 662 {
 663         int i;
 664
 665         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 666                 struct bin_attribute *res_attr;
 667
 668                 res_attr = pdev->res_attr[i];
 669                 if (res_attr) {
 670                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 671                         kfree(res_attr);
 672                 }
 673
 674                 res_attr = pdev->res_attr_wc[i];
 675                 if (res_attr) {
 676                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 677                         kfree(res_attr);
 678                 }
 679         }
 680 }
 681
 682 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 683 {
 684         /* allocate attribute structure, piggyback attribute name */
 685         int name_len = write_combine ? 13 : 10;
 686         struct bin_attribute *res_attr;
 687         int retval;
 688
 689         res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
 690         if (res_attr) {
 691                 char *res_attr_name = (char *)(res_attr + 1);
 692
 693                 if (write_combine) {
 694                         pdev->res_attr_wc[num] = res_attr;
 695                         sprintf(res_attr_name, "resource%d_wc", num);
 696                         res_attr->mmap = pci_mmap_resource_wc;
 697                 } else {
 698                         pdev->res_attr[num] = res_attr;
 699                         sprintf(res_attr_name, "resource%d", num);
 700                         res_attr->mmap = pci_mmap_resource_uc;
 701                 }
 702                 res_attr->attr.name = res_attr_name;
 703                 res_attr->attr.mode = S_IRUSR | S_IWUSR;
 704                 res_attr->size = pci_resource_len(pdev, num);
 705                 res_attr->private = &pdev->resource[num];
 706                 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 707         } else
 708                 retval = -ENOMEM;
 709
 710         return retval;
 711 }
 712
 713 /**
 714  * pci_create_resource_files - create resource files in sysfs for @dev
 715  * @dev: dev in question
 716  *
 717  * Walk the resources in @dev creating files for each resource available.
 718  */
 719 static int pci_create_resource_files(struct pci_dev *pdev)
 720 {
 721         int i;
 722         int retval;
 723
 724         /* Expose the PCI resources from this device as files */
 725         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 726
 727                 /* skip empty resources */
 728                 if (!pci_resource_len(pdev, i))
 729                         continue;
 730
 731                 retval = pci_create_attr(pdev, i, 0);
 732                 /* for prefetchable resources, create a WC mappable file */
 733                 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
 734                         retval = pci_create_attr(pdev, i, 1);
 735
 736                 if (retval) {
 737                         pci_remove_resource_files(pdev);
 738                         return retval;
 739                 }
 740         }
 741         return 0;
 742 }
 743 #else /* !HAVE_PCI_MMAP */
 744 static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
 745 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
 746 #endif /* HAVE_PCI_MMAP */
 747
 748 /**
 749  * pci_write_rom - used to enable access to the PCI ROM display
 750  * @kobj: kernel object handle
 751  * @buf: user input
 752  * @off: file offset
 753  * @count: number of byte in input
 754  *
 755  * writing anything except 0 enables it
 756  */
 757 static ssize_t
 758 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 759               char *buf, loff_t off, size_t count)
 760 {
 761         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 762
 763         if ((off ==  0) && (*buf == '0') && (count == 2))
 764                 pdev->rom_attr_enabled = 0;
 765         else
 766                 pdev->rom_attr_enabled = 1;
 767
 768         return count;
 769 }
 770
 771 /**
 772  * pci_read_rom - read a PCI ROM
 773  * @kobj: kernel object handle
 774  * @buf: where to put the data we read from the ROM
 775  * @off: file offset
 776  * @count: number of bytes to read
 777  *
 778  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 779  * device corresponding to @kobj.
 780  */
 781 static ssize_t
 782 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 783              char *buf, loff_t off, size_t count)
 784 {
 785         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 786         void __iomem *rom;
 787         size_t size;
 788
 789         if (!pdev->rom_attr_enabled)
 790                 return -EINVAL;
 791
 792         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 793         if (!rom)
 794                 return 0;
 795
 796         if (off >= size)
 797                 count = 0;
 798         else {
 799                 if (off + count > size)
 800                         count = size - off;
 801
 802                 memcpy_fromio(buf, rom + off, count);
 803         }
 804         pci_unmap_rom(pdev, rom);
 805
 806         return count;
 807 }
 808
 809 static struct bin_attribute pci_config_attr = {
 810         .attr = {
 811                 .name = "config",
 812                 .mode = S_IRUGO | S_IWUSR,
 813         },
 814         .size = PCI_CFG_SPACE_SIZE,
 815         .read = pci_read_config,
 816         .write = pci_write_config,
 817 };
 818
 819 static struct bin_attribute pcie_config_attr = {
 820         .attr = {
 821                 .name = "config",
 822                 .mode = S_IRUGO | S_IWUSR,
 823         },
 824         .size = PCI_CFG_SPACE_EXP_SIZE,
 825         .read = pci_read_config,
 826         .write = pci_write_config,
 827 };
 828
 829 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 830 {
 831         return 0;
 832 }
 833
 834 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
 835 {
 836         int retval;
 837         struct bin_attribute *attr;
 838
 839         /* If the device has VPD, try to expose it in sysfs. */
 840         if (dev->vpd) {
 841                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 842                 if (!attr)
 843                         return -ENOMEM;
 844
 845                 attr->size = dev->vpd->len;
 846                 attr->attr.name = "vpd";
 847                 attr->attr.mode = S_IRUSR | S_IWUSR;
 848                 attr->read = pci_read_vpd;
 849                 attr->write = pci_write_vpd;
 850                 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
 851                 if (retval) {
 852                         kfree(dev->vpd->attr);
 853                         return retval;
 854                 }
 855                 dev->vpd->attr = attr;
 856         }
 857
 858         /* Active State Power Management */
 859         pcie_aspm_create_sysfs_dev_files(dev);
 860
 861         return 0;
 862 }
 863
 864 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 865 {
 866         int retval;
 867         int rom_size = 0;
 868         struct bin_attribute *attr;
 869
 870         if (!sysfs_initialized)
 871                 return -EACCES;
 872
 873         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 874                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 875         else
 876                 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 877         if (retval)
 878                 goto err;
 879
 880         retval = pci_create_resource_files(pdev);
 881         if (retval)
 882                 goto err_config_file;
 883
 884         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
 885                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 886         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
 887                 rom_size = 0x20000;
 888
 889         /* If the device has a ROM, try to expose it in sysfs. */
 890         if (rom_size) {
 891                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 892                 if (!attr) {
 893                         retval = -ENOMEM;
 894                         goto err_resource_files;
 895                 }
 896                 attr->size = rom_size;
 897                 attr->attr.name = "rom";
 898                 attr->attr.mode = S_IRUSR;
 899                 attr->read = pci_read_rom;
 900                 attr->write = pci_write_rom;
 901                 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
 902                 if (retval) {
 903                         kfree(attr);
 904                         goto err_resource_files;
 905                 }
 906                 pdev->rom_attr = attr;
 907         }
 908
 909         /* add platform-specific attributes */
 910         retval = pcibios_add_platform_entries(pdev);
 911         if (retval)
 912                 goto err_rom_file;
 913
 914         /* add sysfs entries for various capabilities */
 915         retval = pci_create_capabilities_sysfs(pdev);
 916         if (retval)
 917                 goto err_rom_file;
 918
 919         return 0;
 920
 921 err_rom_file:
 922         if (rom_size) {
 923                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 924                 kfree(pdev->rom_attr);
 925                 pdev->rom_attr = NULL;
 926         }
 927 err_resource_files:
 928         pci_remove_resource_files(pdev);
 929 err_config_file:
 930         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 931                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 932         else
 933                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 934 err:
 935         return retval;
 936 }
 937
 938 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
 939 {
 940         if (dev->vpd && dev->vpd->attr) {
 941                 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
 942                 kfree(dev->vpd->attr);
 943         }
 944
 945         pcie_aspm_remove_sysfs_dev_files(dev);
 946 }
 947
 948 /**
 949  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
 950  * @pdev: device whose entries we should free
 951  *
 952  * Cleanup when @pdev is removed from sysfs.
 953  */
 954 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 955 {
 956         int rom_size = 0;
 957
 958         if (!sysfs_initialized)
 959                 return;
 960
 961         pci_remove_capabilities_sysfs(pdev);
 962
 963         if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
 964                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 965         else
 966                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 967
 968         pci_remove_resource_files(pdev);
 969
 970         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
 971                 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 972         else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
 973                 rom_size = 0x20000;
 974
 975         if (rom_size && pdev->rom_attr) {
 976                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 977                 kfree(pdev->rom_attr);
 978         }
 979 }
 980
 981 static int __init pci_sysfs_init(void)
 982 {
 983         struct pci_dev *pdev = NULL;
 984         int retval;
 985
 986         sysfs_initialized = 1;
 987         for_each_pci_dev(pdev) {
 988                 retval = pci_create_sysfs_dev_files(pdev);
 989                 if (retval) {
 990                         pci_dev_put(pdev);
 991                         return retval;
 992                 }
 993         }
 994
 995         return 0;
 996 }
 997
 998 late_initcall(pci_sysfs_init);