1 /* 2 * drivers/pci/pci-sysfs.c 3 * 4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com> 5 * (C) Copyright 2002-2004 IBM Corp. 6 * (C) Copyright 2003 Matthew Wilcox 7 * (C) Copyright 2003 Hewlett-Packard 8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com> 9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com> 10 * 11 * File attributes for PCI devices 12 * 13 * Modeled after usb's driverfs.c 14 * 15 */ 16 17 18 #include <linux/kernel.h> 19 #include <linux/sched.h> 20 #include <linux/pci.h> 21 #include <linux/stat.h> 22 #include <linux/export.h> 23 #include <linux/topology.h> 24 #include <linux/mm.h> 25 #include <linux/fs.h> 26 #include <linux/capability.h> 27 #include <linux/security.h> 28 #include <linux/pci-aspm.h> 29 #include <linux/slab.h> 30 #include <linux/vgaarb.h> 31 #include <linux/pm_runtime.h> 32 #include <linux/of.h> 33 #include "pci.h" 34 35 static int sysfs_initialized; /* = 0 */ 36 37 /* show configuration fields */ 38 #define pci_config_attr(field, format_string) \ 39 static ssize_t \ 40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 41 { \ 42 struct pci_dev *pdev; \ 43 \ 44 pdev = to_pci_dev(dev); \ 45 return sprintf(buf, format_string, pdev->field); \ 46 } \ 47 static DEVICE_ATTR_RO(field) 48 49 pci_config_attr(vendor, "0x%04x\n"); 50 pci_config_attr(device, "0x%04x\n"); 51 pci_config_attr(subsystem_vendor, "0x%04x\n"); 52 pci_config_attr(subsystem_device, "0x%04x\n"); 53 pci_config_attr(class, "0x%06x\n"); 54 pci_config_attr(irq, "%u\n"); 55 56 static ssize_t broken_parity_status_show(struct device *dev, 57 struct device_attribute *attr, 58 char *buf) 59 { 60 struct pci_dev *pdev = to_pci_dev(dev); 61 return sprintf(buf, "%u\n", pdev->broken_parity_status); 62 } 63 64 static ssize_t broken_parity_status_store(struct device *dev, 65 struct device_attribute *attr, 66 const char *buf, size_t count) 67 { 68 struct pci_dev *pdev = to_pci_dev(dev); 69 unsigned long val; 70 71 if (kstrtoul(buf, 0, &val) < 0) 72 return -EINVAL; 73 74 pdev->broken_parity_status = !!val; 75 76 return count; 77 } 78 static DEVICE_ATTR_RW(broken_parity_status); 79 80 static ssize_t pci_dev_show_local_cpu(struct device *dev, int type, 81 struct device_attribute *attr, char *buf) 82 { 83 const struct cpumask *mask; 84 int len; 85 86 #ifdef CONFIG_NUMA 87 mask = (dev_to_node(dev) == -1) ? cpu_online_mask : 88 cpumask_of_node(dev_to_node(dev)); 89 #else 90 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus); 91 #endif 92 len = type ? 93 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) : 94 cpulist_scnprintf(buf, PAGE_SIZE-2, mask); 95 96 buf[len++] = '\n'; 97 buf[len] = '\0'; 98 return len; 99 } 100 101 static ssize_t local_cpus_show(struct device *dev, 102 struct device_attribute *attr, char *buf) 103 { 104 return pci_dev_show_local_cpu(dev, 1, attr, buf); 105 } 106 static DEVICE_ATTR_RO(local_cpus); 107 108 static ssize_t local_cpulist_show(struct device *dev, 109 struct device_attribute *attr, char *buf) 110 { 111 return pci_dev_show_local_cpu(dev, 0, attr, buf); 112 } 113 static DEVICE_ATTR_RO(local_cpulist); 114 115 /* 116 * PCI Bus Class Devices 117 */ 118 static ssize_t pci_bus_show_cpuaffinity(struct device *dev, int type, 119 struct device_attribute *attr, 120 char *buf) 121 { 122 int ret; 123 const struct cpumask *cpumask; 124 125 cpumask = cpumask_of_pcibus(to_pci_bus(dev)); 126 ret = type ? 127 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) : 128 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask); 129 buf[ret++] = '\n'; 130 buf[ret] = '\0'; 131 return ret; 132 } 133 134 static ssize_t cpuaffinity_show(struct device *dev, 135 struct device_attribute *attr, char *buf) 136 { 137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf); 138 } 139 static DEVICE_ATTR_RO(cpuaffinity); 140 141 static ssize_t cpulistaffinity_show(struct device *dev, 142 struct device_attribute *attr, char *buf) 143 { 144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf); 145 } 146 static DEVICE_ATTR_RO(cpulistaffinity); 147 148 /* show resources */ 149 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, 150 char *buf) 151 { 152 struct pci_dev *pci_dev = to_pci_dev(dev); 153 char *str = buf; 154 int i; 155 int max; 156 resource_size_t start, end; 157 158 if (pci_dev->subordinate) 159 max = DEVICE_COUNT_RESOURCE; 160 else 161 max = PCI_BRIDGE_RESOURCES; 162 163 for (i = 0; i < max; i++) { 164 struct resource *res = &pci_dev->resource[i]; 165 pci_resource_to_user(pci_dev, i, res, &start, &end); 166 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n", 167 (unsigned long long)start, 168 (unsigned long long)end, 169 (unsigned long long)res->flags); 170 } 171 return (str - buf); 172 } 173 static DEVICE_ATTR_RO(resource); 174 175 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 176 char *buf) 177 { 178 struct pci_dev *pci_dev = to_pci_dev(dev); 179 180 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n", 181 pci_dev->vendor, pci_dev->device, 182 pci_dev->subsystem_vendor, pci_dev->subsystem_device, 183 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), 184 (u8)(pci_dev->class)); 185 } 186 static DEVICE_ATTR_RO(modalias); 187 188 static ssize_t enable_store(struct device *dev, struct device_attribute *attr, 189 const char *buf, size_t count) 190 { 191 struct pci_dev *pdev = to_pci_dev(dev); 192 unsigned long val; 193 ssize_t result = kstrtoul(buf, 0, &val); 194 195 if (result < 0) 196 return result; 197 198 /* this can crash the machine when done on the "wrong" device */ 199 if (!capable(CAP_SYS_ADMIN)) 200 return -EPERM; 201 202 if (!val) { 203 if (pci_is_enabled(pdev)) 204 pci_disable_device(pdev); 205 else 206 result = -EIO; 207 } else 208 result = pci_enable_device(pdev); 209 210 return result < 0 ? result : count; 211 } 212 213 static ssize_t enable_show(struct device *dev, struct device_attribute *attr, 214 char *buf) 215 { 216 struct pci_dev *pdev; 217 218 pdev = to_pci_dev(dev); 219 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt)); 220 } 221 static DEVICE_ATTR_RW(enable); 222 223 #ifdef CONFIG_NUMA 224 static ssize_t numa_node_store(struct device *dev, 225 struct device_attribute *attr, const char *buf, 226 size_t count) 227 { 228 struct pci_dev *pdev = to_pci_dev(dev); 229 int node, ret; 230 231 if (!capable(CAP_SYS_ADMIN)) 232 return -EPERM; 233 234 ret = kstrtoint(buf, 0, &node); 235 if (ret) 236 return ret; 237 238 if (!node_online(node)) 239 return -EINVAL; 240 241 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); 242 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.", 243 node); 244 245 dev->numa_node = node; 246 return count; 247 } 248 249 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, 250 char *buf) 251 { 252 return sprintf(buf, "%d\n", dev->numa_node); 253 } 254 static DEVICE_ATTR_RW(numa_node); 255 #endif 256 257 static ssize_t dma_mask_bits_show(struct device *dev, 258 struct device_attribute *attr, char *buf) 259 { 260 struct pci_dev *pdev = to_pci_dev(dev); 261 262 return sprintf(buf, "%d\n", fls64(pdev->dma_mask)); 263 } 264 static DEVICE_ATTR_RO(dma_mask_bits); 265 266 static ssize_t consistent_dma_mask_bits_show(struct device *dev, 267 struct device_attribute *attr, 268 char *buf) 269 { 270 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask)); 271 } 272 static DEVICE_ATTR_RO(consistent_dma_mask_bits); 273 274 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr, 275 char *buf) 276 { 277 struct pci_dev *pdev = to_pci_dev(dev); 278 struct pci_bus *subordinate = pdev->subordinate; 279 280 return sprintf(buf, "%u\n", subordinate ? 281 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) 282 : !pdev->no_msi); 283 } 284 285 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr, 286 const char *buf, size_t count) 287 { 288 struct pci_dev *pdev = to_pci_dev(dev); 289 struct pci_bus *subordinate = pdev->subordinate; 290 unsigned long val; 291 292 if (kstrtoul(buf, 0, &val) < 0) 293 return -EINVAL; 294 295 if (!capable(CAP_SYS_ADMIN)) 296 return -EPERM; 297 298 /* 299 * "no_msi" and "bus_flags" only affect what happens when a driver 300 * requests MSI or MSI-X. They don't affect any drivers that have 301 * already requested MSI or MSI-X. 302 */ 303 if (!subordinate) { 304 pdev->no_msi = !val; 305 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n", 306 val ? "allowed" : "disallowed"); 307 return count; 308 } 309 310 if (val) 311 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; 312 else 313 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; 314 315 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n", 316 val ? "allowed" : "disallowed"); 317 return count; 318 } 319 static DEVICE_ATTR_RW(msi_bus); 320 321 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, 322 size_t count) 323 { 324 unsigned long val; 325 struct pci_bus *b = NULL; 326 327 if (kstrtoul(buf, 0, &val) < 0) 328 return -EINVAL; 329 330 if (val) { 331 pci_lock_rescan_remove(); 332 while ((b = pci_find_next_bus(b)) != NULL) 333 pci_rescan_bus(b); 334 pci_unlock_rescan_remove(); 335 } 336 return count; 337 } 338 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store); 339 340 static struct attribute *pci_bus_attrs[] = { 341 &bus_attr_rescan.attr, 342 NULL, 343 }; 344 345 static const struct attribute_group pci_bus_group = { 346 .attrs = pci_bus_attrs, 347 }; 348 349 const struct attribute_group *pci_bus_groups[] = { 350 &pci_bus_group, 351 NULL, 352 }; 353 354 static ssize_t dev_rescan_store(struct device *dev, 355 struct device_attribute *attr, const char *buf, 356 size_t count) 357 { 358 unsigned long val; 359 struct pci_dev *pdev = to_pci_dev(dev); 360 361 if (kstrtoul(buf, 0, &val) < 0) 362 return -EINVAL; 363 364 if (val) { 365 pci_lock_rescan_remove(); 366 pci_rescan_bus(pdev->bus); 367 pci_unlock_rescan_remove(); 368 } 369 return count; 370 } 371 static struct device_attribute dev_rescan_attr = __ATTR(rescan, 372 (S_IWUSR|S_IWGRP), 373 NULL, dev_rescan_store); 374 375 static ssize_t remove_store(struct device *dev, struct device_attribute *attr, 376 const char *buf, size_t count) 377 { 378 unsigned long val; 379 380 if (kstrtoul(buf, 0, &val) < 0) 381 return -EINVAL; 382 383 if (val && device_remove_file_self(dev, attr)) 384 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); 385 return count; 386 } 387 static struct device_attribute dev_remove_attr = __ATTR(remove, 388 (S_IWUSR|S_IWGRP), 389 NULL, remove_store); 390 391 static ssize_t dev_bus_rescan_store(struct device *dev, 392 struct device_attribute *attr, 393 const char *buf, size_t count) 394 { 395 unsigned long val; 396 struct pci_bus *bus = to_pci_bus(dev); 397 398 if (kstrtoul(buf, 0, &val) < 0) 399 return -EINVAL; 400 401 if (val) { 402 pci_lock_rescan_remove(); 403 if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) 404 pci_rescan_bus_bridge_resize(bus->self); 405 else 406 pci_rescan_bus(bus); 407 pci_unlock_rescan_remove(); 408 } 409 return count; 410 } 411 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store); 412 413 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 414 static ssize_t d3cold_allowed_store(struct device *dev, 415 struct device_attribute *attr, 416 const char *buf, size_t count) 417 { 418 struct pci_dev *pdev = to_pci_dev(dev); 419 unsigned long val; 420 421 if (kstrtoul(buf, 0, &val) < 0) 422 return -EINVAL; 423 424 pdev->d3cold_allowed = !!val; 425 pm_runtime_resume(dev); 426 427 return count; 428 } 429 430 static ssize_t d3cold_allowed_show(struct device *dev, 431 struct device_attribute *attr, char *buf) 432 { 433 struct pci_dev *pdev = to_pci_dev(dev); 434 return sprintf(buf, "%u\n", pdev->d3cold_allowed); 435 } 436 static DEVICE_ATTR_RW(d3cold_allowed); 437 #endif 438 439 #ifdef CONFIG_OF 440 static ssize_t devspec_show(struct device *dev, 441 struct device_attribute *attr, char *buf) 442 { 443 struct pci_dev *pdev = to_pci_dev(dev); 444 struct device_node *np = pci_device_to_OF_node(pdev); 445 446 if (np == NULL || np->full_name == NULL) 447 return 0; 448 return sprintf(buf, "%s", np->full_name); 449 } 450 static DEVICE_ATTR_RO(devspec); 451 #endif 452 453 #ifdef CONFIG_PCI_IOV 454 static ssize_t sriov_totalvfs_show(struct device *dev, 455 struct device_attribute *attr, 456 char *buf) 457 { 458 struct pci_dev *pdev = to_pci_dev(dev); 459 460 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev)); 461 } 462 463 464 static ssize_t sriov_numvfs_show(struct device *dev, 465 struct device_attribute *attr, 466 char *buf) 467 { 468 struct pci_dev *pdev = to_pci_dev(dev); 469 470 return sprintf(buf, "%u\n", pdev->sriov->num_VFs); 471 } 472 473 /* 474 * num_vfs > 0; number of VFs to enable 475 * num_vfs = 0; disable all VFs 476 * 477 * Note: SRIOV spec doesn't allow partial VF 478 * disable, so it's all or none. 479 */ 480 static ssize_t sriov_numvfs_store(struct device *dev, 481 struct device_attribute *attr, 482 const char *buf, size_t count) 483 { 484 struct pci_dev *pdev = to_pci_dev(dev); 485 int ret; 486 u16 num_vfs; 487 488 ret = kstrtou16(buf, 0, &num_vfs); 489 if (ret < 0) 490 return ret; 491 492 if (num_vfs > pci_sriov_get_totalvfs(pdev)) 493 return -ERANGE; 494 495 if (num_vfs == pdev->sriov->num_VFs) 496 return count; /* no change */ 497 498 /* is PF driver loaded w/callback */ 499 if (!pdev->driver || !pdev->driver->sriov_configure) { 500 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n"); 501 return -ENOSYS; 502 } 503 504 if (num_vfs == 0) { 505 /* disable VFs */ 506 ret = pdev->driver->sriov_configure(pdev, 0); 507 if (ret < 0) 508 return ret; 509 return count; 510 } 511 512 /* enable VFs */ 513 if (pdev->sriov->num_VFs) { 514 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n", 515 pdev->sriov->num_VFs, num_vfs); 516 return -EBUSY; 517 } 518 519 ret = pdev->driver->sriov_configure(pdev, num_vfs); 520 if (ret < 0) 521 return ret; 522 523 if (ret != num_vfs) 524 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n", 525 num_vfs, ret); 526 527 return count; 528 } 529 530 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs); 531 static struct device_attribute sriov_numvfs_attr = 532 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP), 533 sriov_numvfs_show, sriov_numvfs_store); 534 #endif /* CONFIG_PCI_IOV */ 535 536 static ssize_t driver_override_store(struct device *dev, 537 struct device_attribute *attr, 538 const char *buf, size_t count) 539 { 540 struct pci_dev *pdev = to_pci_dev(dev); 541 char *driver_override, *old = pdev->driver_override, *cp; 542 543 if (count > PATH_MAX) 544 return -EINVAL; 545 546 driver_override = kstrndup(buf, count, GFP_KERNEL); 547 if (!driver_override) 548 return -ENOMEM; 549 550 cp = strchr(driver_override, '\n'); 551 if (cp) 552 *cp = '\0'; 553 554 if (strlen(driver_override)) { 555 pdev->driver_override = driver_override; 556 } else { 557 kfree(driver_override); 558 pdev->driver_override = NULL; 559 } 560 561 kfree(old); 562 563 return count; 564 } 565 566 static ssize_t driver_override_show(struct device *dev, 567 struct device_attribute *attr, char *buf) 568 { 569 struct pci_dev *pdev = to_pci_dev(dev); 570 571 return sprintf(buf, "%s\n", pdev->driver_override); 572 } 573 static DEVICE_ATTR_RW(driver_override); 574 575 static struct attribute *pci_dev_attrs[] = { 576 &dev_attr_resource.attr, 577 &dev_attr_vendor.attr, 578 &dev_attr_device.attr, 579 &dev_attr_subsystem_vendor.attr, 580 &dev_attr_subsystem_device.attr, 581 &dev_attr_class.attr, 582 &dev_attr_irq.attr, 583 &dev_attr_local_cpus.attr, 584 &dev_attr_local_cpulist.attr, 585 &dev_attr_modalias.attr, 586 #ifdef CONFIG_NUMA 587 &dev_attr_numa_node.attr, 588 #endif 589 &dev_attr_dma_mask_bits.attr, 590 &dev_attr_consistent_dma_mask_bits.attr, 591 &dev_attr_enable.attr, 592 &dev_attr_broken_parity_status.attr, 593 &dev_attr_msi_bus.attr, 594 #if defined(CONFIG_PM) && defined(CONFIG_ACPI) 595 &dev_attr_d3cold_allowed.attr, 596 #endif 597 #ifdef CONFIG_OF 598 &dev_attr_devspec.attr, 599 #endif 600 &dev_attr_driver_override.attr, 601 NULL, 602 }; 603 604 static const struct attribute_group pci_dev_group = { 605 .attrs = pci_dev_attrs, 606 }; 607 608 const struct attribute_group *pci_dev_groups[] = { 609 &pci_dev_group, 610 NULL, 611 }; 612 613 static struct attribute *pcibus_attrs[] = { 614 &dev_attr_rescan.attr, 615 &dev_attr_cpuaffinity.attr, 616 &dev_attr_cpulistaffinity.attr, 617 NULL, 618 }; 619 620 static const struct attribute_group pcibus_group = { 621 .attrs = pcibus_attrs, 622 }; 623 624 const struct attribute_group *pcibus_groups[] = { 625 &pcibus_group, 626 NULL, 627 }; 628 629 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, 630 char *buf) 631 { 632 struct pci_dev *pdev = to_pci_dev(dev); 633 struct pci_dev *vga_dev = vga_default_device(); 634 635 if (vga_dev) 636 return sprintf(buf, "%u\n", (pdev == vga_dev)); 637 638 return sprintf(buf, "%u\n", 639 !!(pdev->resource[PCI_ROM_RESOURCE].flags & 640 IORESOURCE_ROM_SHADOW)); 641 } 642 static struct device_attribute vga_attr = __ATTR_RO(boot_vga); 643 644 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, 645 struct bin_attribute *bin_attr, char *buf, 646 loff_t off, size_t count) 647 { 648 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device, 649 kobj)); 650 unsigned int size = 64; 651 loff_t init_off = off; 652 u8 *data = (u8 *) buf; 653 654 /* Several chips lock up trying to read undefined config space */ 655 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) 656 size = dev->cfg_size; 657 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 658 size = 128; 659 660 if (off > size) 661 return 0; 662 if (off + count > size) { 663 size -= off; 664 count = size; 665 } else { 666 size = count; 667 } 668 669 pci_config_pm_runtime_get(dev); 670 671 if ((off & 1) && size) { 672 u8 val; 673 pci_user_read_config_byte(dev, off, &val); 674 data[off - init_off] = val; 675 off++; 676 size--; 677 } 678 679 if ((off & 3) && size > 2) { 680 u16 val; 681 pci_user_read_config_word(dev, off, &val); 682 data[off - init_off] = val & 0xff; 683 data[off - init_off + 1] = (val >> 8) & 0xff; 684 off += 2; 685 size -= 2; 686 } 687 688 while (size > 3) { 689 u32 val; 690 pci_user_read_config_dword(dev, off, &val); 691 data[off - init_off] = val & 0xff; 692 data[off - init_off + 1] = (val >> 8) & 0xff; 693 data[off - init_off + 2] = (val >> 16) & 0xff; 694 data[off - init_off + 3] = (val >> 24) & 0xff; 695 off += 4; 696 size -= 4; 697 } 698 699 if (size >= 2) { 700 u16 val; 701 pci_user_read_config_word(dev, off, &val); 702 data[off - init_off] = val & 0xff; 703 data[off - init_off + 1] = (val >> 8) & 0xff; 704 off += 2; 705 size -= 2; 706 } 707 708 if (size > 0) { 709 u8 val; 710 pci_user_read_config_byte(dev, off, &val); 711 data[off - init_off] = val; 712 off++; 713 --size; 714 } 715 716 pci_config_pm_runtime_put(dev); 717 718 return count; 719 } 720 721 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, 722 struct bin_attribute *bin_attr, char *buf, 723 loff_t off, size_t count) 724 { 725 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device, 726 kobj)); 727 unsigned int size = count; 728 loff_t init_off = off; 729 u8 *data = (u8 *) buf; 730 731 if (off > dev->cfg_size) 732 return 0; 733 if (off + count > dev->cfg_size) { 734 size = dev->cfg_size - off; 735 count = size; 736 } 737 738 pci_config_pm_runtime_get(dev); 739 740 if ((off & 1) && size) { 741 pci_user_write_config_byte(dev, off, data[off - init_off]); 742 off++; 743 size--; 744 } 745 746 if ((off & 3) && size > 2) { 747 u16 val = data[off - init_off]; 748 val |= (u16) data[off - init_off + 1] << 8; 749 pci_user_write_config_word(dev, off, val); 750 off += 2; 751 size -= 2; 752 } 753 754 while (size > 3) { 755 u32 val = data[off - init_off]; 756 val |= (u32) data[off - init_off + 1] << 8; 757 val |= (u32) data[off - init_off + 2] << 16; 758 val |= (u32) data[off - init_off + 3] << 24; 759 pci_user_write_config_dword(dev, off, val); 760 off += 4; 761 size -= 4; 762 } 763 764 if (size >= 2) { 765 u16 val = data[off - init_off]; 766 val |= (u16) data[off - init_off + 1] << 8; 767 pci_user_write_config_word(dev, off, val); 768 off += 2; 769 size -= 2; 770 } 771 772 if (size) { 773 pci_user_write_config_byte(dev, off, data[off - init_off]); 774 off++; 775 --size; 776 } 777 778 pci_config_pm_runtime_put(dev); 779 780 return count; 781 } 782 783 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj, 784 struct bin_attribute *bin_attr, char *buf, 785 loff_t off, size_t count) 786 { 787 struct pci_dev *dev = 788 to_pci_dev(container_of(kobj, struct device, kobj)); 789 790 if (off > bin_attr->size) 791 count = 0; 792 else if (count > bin_attr->size - off) 793 count = bin_attr->size - off; 794 795 return pci_read_vpd(dev, off, count, buf); 796 } 797 798 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj, 799 struct bin_attribute *bin_attr, char *buf, 800 loff_t off, size_t count) 801 { 802 struct pci_dev *dev = 803 to_pci_dev(container_of(kobj, struct device, kobj)); 804 805 if (off > bin_attr->size) 806 count = 0; 807 else if (count > bin_attr->size - off) 808 count = bin_attr->size - off; 809 810 return pci_write_vpd(dev, off, count, buf); 811 } 812 813 #ifdef HAVE_PCI_LEGACY 814 /** 815 * pci_read_legacy_io - read byte(s) from legacy I/O port space 816 * @filp: open sysfs file 817 * @kobj: kobject corresponding to file to read from 818 * @bin_attr: struct bin_attribute for this file 819 * @buf: buffer to store results 820 * @off: offset into legacy I/O port space 821 * @count: number of bytes to read 822 * 823 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific 824 * callback routine (pci_legacy_read). 825 */ 826 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, 827 struct bin_attribute *bin_attr, char *buf, 828 loff_t off, size_t count) 829 { 830 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 831 kobj)); 832 833 /* Only support 1, 2 or 4 byte accesses */ 834 if (count != 1 && count != 2 && count != 4) 835 return -EINVAL; 836 837 return pci_legacy_read(bus, off, (u32 *)buf, count); 838 } 839 840 /** 841 * pci_write_legacy_io - write byte(s) to legacy I/O port space 842 * @filp: open sysfs file 843 * @kobj: kobject corresponding to file to read from 844 * @bin_attr: struct bin_attribute for this file 845 * @buf: buffer containing value to be written 846 * @off: offset into legacy I/O port space 847 * @count: number of bytes to write 848 * 849 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific 850 * callback routine (pci_legacy_write). 851 */ 852 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj, 853 struct bin_attribute *bin_attr, char *buf, 854 loff_t off, size_t count) 855 { 856 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 857 kobj)); 858 859 /* Only support 1, 2 or 4 byte accesses */ 860 if (count != 1 && count != 2 && count != 4) 861 return -EINVAL; 862 863 return pci_legacy_write(bus, off, *(u32 *)buf, count); 864 } 865 866 /** 867 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space 868 * @filp: open sysfs file 869 * @kobj: kobject corresponding to device to be mapped 870 * @attr: struct bin_attribute for this file 871 * @vma: struct vm_area_struct passed to mmap 872 * 873 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap 874 * legacy memory space (first meg of bus space) into application virtual 875 * memory space. 876 */ 877 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj, 878 struct bin_attribute *attr, 879 struct vm_area_struct *vma) 880 { 881 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 882 kobj)); 883 884 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem); 885 } 886 887 /** 888 * pci_mmap_legacy_io - map legacy PCI IO into user memory space 889 * @filp: open sysfs file 890 * @kobj: kobject corresponding to device to be mapped 891 * @attr: struct bin_attribute for this file 892 * @vma: struct vm_area_struct passed to mmap 893 * 894 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap 895 * legacy IO space (first meg of bus space) into application virtual 896 * memory space. Returns -ENOSYS if the operation isn't supported 897 */ 898 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj, 899 struct bin_attribute *attr, 900 struct vm_area_struct *vma) 901 { 902 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device, 903 kobj)); 904 905 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); 906 } 907 908 /** 909 * pci_adjust_legacy_attr - adjustment of legacy file attributes 910 * @b: bus to create files under 911 * @mmap_type: I/O port or memory 912 * 913 * Stub implementation. Can be overridden by arch if necessary. 914 */ 915 void __weak pci_adjust_legacy_attr(struct pci_bus *b, 916 enum pci_mmap_state mmap_type) 917 { 918 } 919 920 /** 921 * pci_create_legacy_files - create legacy I/O port and memory files 922 * @b: bus to create files under 923 * 924 * Some platforms allow access to legacy I/O port and ISA memory space on 925 * a per-bus basis. This routine creates the files and ties them into 926 * their associated read, write and mmap files from pci-sysfs.c 927 * 928 * On error unwind, but don't propagate the error to the caller 929 * as it is ok to set up the PCI bus without these files. 930 */ 931 void pci_create_legacy_files(struct pci_bus *b) 932 { 933 int error; 934 935 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, 936 GFP_ATOMIC); 937 if (!b->legacy_io) 938 goto kzalloc_err; 939 940 sysfs_bin_attr_init(b->legacy_io); 941 b->legacy_io->attr.name = "legacy_io"; 942 b->legacy_io->size = 0xffff; 943 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; 944 b->legacy_io->read = pci_read_legacy_io; 945 b->legacy_io->write = pci_write_legacy_io; 946 b->legacy_io->mmap = pci_mmap_legacy_io; 947 pci_adjust_legacy_attr(b, pci_mmap_io); 948 error = device_create_bin_file(&b->dev, b->legacy_io); 949 if (error) 950 goto legacy_io_err; 951 952 /* Allocated above after the legacy_io struct */ 953 b->legacy_mem = b->legacy_io + 1; 954 sysfs_bin_attr_init(b->legacy_mem); 955 b->legacy_mem->attr.name = "legacy_mem"; 956 b->legacy_mem->size = 1024*1024; 957 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; 958 b->legacy_mem->mmap = pci_mmap_legacy_mem; 959 pci_adjust_legacy_attr(b, pci_mmap_mem); 960 error = device_create_bin_file(&b->dev, b->legacy_mem); 961 if (error) 962 goto legacy_mem_err; 963 964 return; 965 966 legacy_mem_err: 967 device_remove_bin_file(&b->dev, b->legacy_io); 968 legacy_io_err: 969 kfree(b->legacy_io); 970 b->legacy_io = NULL; 971 kzalloc_err: 972 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n"); 973 return; 974 } 975 976 void pci_remove_legacy_files(struct pci_bus *b) 977 { 978 if (b->legacy_io) { 979 device_remove_bin_file(&b->dev, b->legacy_io); 980 device_remove_bin_file(&b->dev, b->legacy_mem); 981 kfree(b->legacy_io); /* both are allocated here */ 982 } 983 } 984 #endif /* HAVE_PCI_LEGACY */ 985 986 #ifdef HAVE_PCI_MMAP 987 988 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, 989 enum pci_mmap_api mmap_api) 990 { 991 unsigned long nr, start, size, pci_start; 992 993 if (pci_resource_len(pdev, resno) == 0) 994 return 0; 995 nr = vma_pages(vma); 996 start = vma->vm_pgoff; 997 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; 998 pci_start = (mmap_api == PCI_MMAP_PROCFS) ? 999 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0; 1000 if (start >= pci_start && start < pci_start + size && 1001 start + nr <= pci_start + size) 1002 return 1; 1003 return 0; 1004 } 1005 1006 /** 1007 * pci_mmap_resource - map a PCI resource into user memory space 1008 * @kobj: kobject for mapping 1009 * @attr: struct bin_attribute for the file being mapped 1010 * @vma: struct vm_area_struct passed into the mmap 1011 * @write_combine: 1 for write_combine mapping 1012 * 1013 * Use the regular PCI mapping routines to map a PCI resource into userspace. 1014 */ 1015 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, 1016 struct vm_area_struct *vma, int write_combine) 1017 { 1018 struct pci_dev *pdev = to_pci_dev(container_of(kobj, 1019 struct device, kobj)); 1020 struct resource *res = attr->private; 1021 enum pci_mmap_state mmap_type; 1022 resource_size_t start, end; 1023 int i; 1024 1025 for (i = 0; i < PCI_ROM_RESOURCE; i++) 1026 if (res == &pdev->resource[i]) 1027 break; 1028 if (i >= PCI_ROM_RESOURCE) 1029 return -ENODEV; 1030 1031 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) { 1032 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n", 1033 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff, 1034 pci_name(pdev), i, 1035 (u64)pci_resource_start(pdev, i), 1036 (u64)pci_resource_len(pdev, i)); 1037 return -EINVAL; 1038 } 1039 1040 /* pci_mmap_page_range() expects the same kind of entry as coming 1041 * from /proc/bus/pci/ which is a "user visible" value. If this is 1042 * different from the resource itself, arch will do necessary fixup. 1043 */ 1044 pci_resource_to_user(pdev, i, res, &start, &end); 1045 vma->vm_pgoff += start >> PAGE_SHIFT; 1046 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; 1047 1048 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start)) 1049 return -EINVAL; 1050 1051 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine); 1052 } 1053 1054 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj, 1055 struct bin_attribute *attr, 1056 struct vm_area_struct *vma) 1057 { 1058 return pci_mmap_resource(kobj, attr, vma, 0); 1059 } 1060 1061 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj, 1062 struct bin_attribute *attr, 1063 struct vm_area_struct *vma) 1064 { 1065 return pci_mmap_resource(kobj, attr, vma, 1); 1066 } 1067 1068 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, 1069 struct bin_attribute *attr, char *buf, 1070 loff_t off, size_t count, bool write) 1071 { 1072 struct pci_dev *pdev = to_pci_dev(container_of(kobj, 1073 struct device, kobj)); 1074 struct resource *res = attr->private; 1075 unsigned long port = off; 1076 int i; 1077 1078 for (i = 0; i < PCI_ROM_RESOURCE; i++) 1079 if (res == &pdev->resource[i]) 1080 break; 1081 if (i >= PCI_ROM_RESOURCE) 1082 return -ENODEV; 1083 1084 port += pci_resource_start(pdev, i); 1085 1086 if (port > pci_resource_end(pdev, i)) 1087 return 0; 1088 1089 if (port + count - 1 > pci_resource_end(pdev, i)) 1090 return -EINVAL; 1091 1092 switch (count) { 1093 case 1: 1094 if (write) 1095 outb(*(u8 *)buf, port); 1096 else 1097 *(u8 *)buf = inb(port); 1098 return 1; 1099 case 2: 1100 if (write) 1101 outw(*(u16 *)buf, port); 1102 else 1103 *(u16 *)buf = inw(port); 1104 return 2; 1105 case 4: 1106 if (write) 1107 outl(*(u32 *)buf, port); 1108 else 1109 *(u32 *)buf = inl(port); 1110 return 4; 1111 } 1112 return -EINVAL; 1113 } 1114 1115 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj, 1116 struct bin_attribute *attr, char *buf, 1117 loff_t off, size_t count) 1118 { 1119 return pci_resource_io(filp, kobj, attr, buf, off, count, false); 1120 } 1121 1122 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, 1123 struct bin_attribute *attr, char *buf, 1124 loff_t off, size_t count) 1125 { 1126 return pci_resource_io(filp, kobj, attr, buf, off, count, true); 1127 } 1128 1129 /** 1130 * pci_remove_resource_files - cleanup resource files 1131 * @pdev: dev to cleanup 1132 * 1133 * If we created resource files for @pdev, remove them from sysfs and 1134 * free their resources. 1135 */ 1136 static void pci_remove_resource_files(struct pci_dev *pdev) 1137 { 1138 int i; 1139 1140 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1141 struct bin_attribute *res_attr; 1142 1143 res_attr = pdev->res_attr[i]; 1144 if (res_attr) { 1145 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1146 kfree(res_attr); 1147 } 1148 1149 res_attr = pdev->res_attr_wc[i]; 1150 if (res_attr) { 1151 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); 1152 kfree(res_attr); 1153 } 1154 } 1155 } 1156 1157 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) 1158 { 1159 /* allocate attribute structure, piggyback attribute name */ 1160 int name_len = write_combine ? 13 : 10; 1161 struct bin_attribute *res_attr; 1162 int retval; 1163 1164 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); 1165 if (res_attr) { 1166 char *res_attr_name = (char *)(res_attr + 1); 1167 1168 sysfs_bin_attr_init(res_attr); 1169 if (write_combine) { 1170 pdev->res_attr_wc[num] = res_attr; 1171 sprintf(res_attr_name, "resource%d_wc", num); 1172 res_attr->mmap = pci_mmap_resource_wc; 1173 } else { 1174 pdev->res_attr[num] = res_attr; 1175 sprintf(res_attr_name, "resource%d", num); 1176 res_attr->mmap = pci_mmap_resource_uc; 1177 } 1178 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { 1179 res_attr->read = pci_read_resource_io; 1180 res_attr->write = pci_write_resource_io; 1181 } 1182 res_attr->attr.name = res_attr_name; 1183 res_attr->attr.mode = S_IRUSR | S_IWUSR; 1184 res_attr->size = pci_resource_len(pdev, num); 1185 res_attr->private = &pdev->resource[num]; 1186 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); 1187 } else 1188 retval = -ENOMEM; 1189 1190 return retval; 1191 } 1192 1193 /** 1194 * pci_create_resource_files - create resource files in sysfs for @dev 1195 * @pdev: dev in question 1196 * 1197 * Walk the resources in @pdev creating files for each resource available. 1198 */ 1199 static int pci_create_resource_files(struct pci_dev *pdev) 1200 { 1201 int i; 1202 int retval; 1203 1204 /* Expose the PCI resources from this device as files */ 1205 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 1206 1207 /* skip empty resources */ 1208 if (!pci_resource_len(pdev, i)) 1209 continue; 1210 1211 retval = pci_create_attr(pdev, i, 0); 1212 /* for prefetchable resources, create a WC mappable file */ 1213 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) 1214 retval = pci_create_attr(pdev, i, 1); 1215 1216 if (retval) { 1217 pci_remove_resource_files(pdev); 1218 return retval; 1219 } 1220 } 1221 return 0; 1222 } 1223 #else /* !HAVE_PCI_MMAP */ 1224 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } 1225 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } 1226 #endif /* HAVE_PCI_MMAP */ 1227 1228 /** 1229 * pci_write_rom - used to enable access to the PCI ROM display 1230 * @filp: sysfs file 1231 * @kobj: kernel object handle 1232 * @bin_attr: struct bin_attribute for this file 1233 * @buf: user input 1234 * @off: file offset 1235 * @count: number of byte in input 1236 * 1237 * writing anything except 0 enables it 1238 */ 1239 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, 1240 struct bin_attribute *bin_attr, char *buf, 1241 loff_t off, size_t count) 1242 { 1243 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); 1244 1245 if ((off == 0) && (*buf == '0') && (count == 2)) 1246 pdev->rom_attr_enabled = 0; 1247 else 1248 pdev->rom_attr_enabled = 1; 1249 1250 return count; 1251 } 1252 1253 /** 1254 * pci_read_rom - read a PCI ROM 1255 * @filp: sysfs file 1256 * @kobj: kernel object handle 1257 * @bin_attr: struct bin_attribute for this file 1258 * @buf: where to put the data we read from the ROM 1259 * @off: file offset 1260 * @count: number of bytes to read 1261 * 1262 * Put @count bytes starting at @off into @buf from the ROM in the PCI 1263 * device corresponding to @kobj. 1264 */ 1265 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, 1266 struct bin_attribute *bin_attr, char *buf, 1267 loff_t off, size_t count) 1268 { 1269 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); 1270 void __iomem *rom; 1271 size_t size; 1272 1273 if (!pdev->rom_attr_enabled) 1274 return -EINVAL; 1275 1276 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ 1277 if (!rom || !size) 1278 return -EIO; 1279 1280 if (off >= size) 1281 count = 0; 1282 else { 1283 if (off + count > size) 1284 count = size - off; 1285 1286 memcpy_fromio(buf, rom + off, count); 1287 } 1288 pci_unmap_rom(pdev, rom); 1289 1290 return count; 1291 } 1292 1293 static struct bin_attribute pci_config_attr = { 1294 .attr = { 1295 .name = "config", 1296 .mode = S_IRUGO | S_IWUSR, 1297 }, 1298 .size = PCI_CFG_SPACE_SIZE, 1299 .read = pci_read_config, 1300 .write = pci_write_config, 1301 }; 1302 1303 static struct bin_attribute pcie_config_attr = { 1304 .attr = { 1305 .name = "config", 1306 .mode = S_IRUGO | S_IWUSR, 1307 }, 1308 .size = PCI_CFG_SPACE_EXP_SIZE, 1309 .read = pci_read_config, 1310 .write = pci_write_config, 1311 }; 1312 1313 static ssize_t reset_store(struct device *dev, struct device_attribute *attr, 1314 const char *buf, size_t count) 1315 { 1316 struct pci_dev *pdev = to_pci_dev(dev); 1317 unsigned long val; 1318 ssize_t result = kstrtoul(buf, 0, &val); 1319 1320 if (result < 0) 1321 return result; 1322 1323 if (val != 1) 1324 return -EINVAL; 1325 1326 result = pci_reset_function(pdev); 1327 if (result < 0) 1328 return result; 1329 1330 return count; 1331 } 1332 1333 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store); 1334 1335 static int pci_create_capabilities_sysfs(struct pci_dev *dev) 1336 { 1337 int retval; 1338 struct bin_attribute *attr; 1339 1340 /* If the device has VPD, try to expose it in sysfs. */ 1341 if (dev->vpd) { 1342 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1343 if (!attr) 1344 return -ENOMEM; 1345 1346 sysfs_bin_attr_init(attr); 1347 attr->size = dev->vpd->len; 1348 attr->attr.name = "vpd"; 1349 attr->attr.mode = S_IRUSR | S_IWUSR; 1350 attr->read = read_vpd_attr; 1351 attr->write = write_vpd_attr; 1352 retval = sysfs_create_bin_file(&dev->dev.kobj, attr); 1353 if (retval) { 1354 kfree(attr); 1355 return retval; 1356 } 1357 dev->vpd->attr = attr; 1358 } 1359 1360 /* Active State Power Management */ 1361 pcie_aspm_create_sysfs_dev_files(dev); 1362 1363 if (!pci_probe_reset_function(dev)) { 1364 retval = device_create_file(&dev->dev, &reset_attr); 1365 if (retval) 1366 goto error; 1367 dev->reset_fn = 1; 1368 } 1369 return 0; 1370 1371 error: 1372 pcie_aspm_remove_sysfs_dev_files(dev); 1373 if (dev->vpd && dev->vpd->attr) { 1374 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); 1375 kfree(dev->vpd->attr); 1376 } 1377 1378 return retval; 1379 } 1380 1381 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) 1382 { 1383 int retval; 1384 int rom_size = 0; 1385 struct bin_attribute *attr; 1386 1387 if (!sysfs_initialized) 1388 return -EACCES; 1389 1390 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) 1391 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); 1392 else 1393 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1394 if (retval) 1395 goto err; 1396 1397 retval = pci_create_resource_files(pdev); 1398 if (retval) 1399 goto err_config_file; 1400 1401 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) 1402 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1403 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) 1404 rom_size = 0x20000; 1405 1406 /* If the device has a ROM, try to expose it in sysfs. */ 1407 if (rom_size) { 1408 attr = kzalloc(sizeof(*attr), GFP_ATOMIC); 1409 if (!attr) { 1410 retval = -ENOMEM; 1411 goto err_resource_files; 1412 } 1413 sysfs_bin_attr_init(attr); 1414 attr->size = rom_size; 1415 attr->attr.name = "rom"; 1416 attr->attr.mode = S_IRUSR | S_IWUSR; 1417 attr->read = pci_read_rom; 1418 attr->write = pci_write_rom; 1419 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); 1420 if (retval) { 1421 kfree(attr); 1422 goto err_resource_files; 1423 } 1424 pdev->rom_attr = attr; 1425 } 1426 1427 /* add sysfs entries for various capabilities */ 1428 retval = pci_create_capabilities_sysfs(pdev); 1429 if (retval) 1430 goto err_rom_file; 1431 1432 pci_create_firmware_label_files(pdev); 1433 1434 return 0; 1435 1436 err_rom_file: 1437 if (rom_size) { 1438 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1439 kfree(pdev->rom_attr); 1440 pdev->rom_attr = NULL; 1441 } 1442 err_resource_files: 1443 pci_remove_resource_files(pdev); 1444 err_config_file: 1445 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) 1446 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1447 else 1448 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1449 err: 1450 return retval; 1451 } 1452 1453 static void pci_remove_capabilities_sysfs(struct pci_dev *dev) 1454 { 1455 if (dev->vpd && dev->vpd->attr) { 1456 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); 1457 kfree(dev->vpd->attr); 1458 } 1459 1460 pcie_aspm_remove_sysfs_dev_files(dev); 1461 if (dev->reset_fn) { 1462 device_remove_file(&dev->dev, &reset_attr); 1463 dev->reset_fn = 0; 1464 } 1465 } 1466 1467 /** 1468 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files 1469 * @pdev: device whose entries we should free 1470 * 1471 * Cleanup when @pdev is removed from sysfs. 1472 */ 1473 void pci_remove_sysfs_dev_files(struct pci_dev *pdev) 1474 { 1475 int rom_size = 0; 1476 1477 if (!sysfs_initialized) 1478 return; 1479 1480 pci_remove_capabilities_sysfs(pdev); 1481 1482 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) 1483 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); 1484 else 1485 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); 1486 1487 pci_remove_resource_files(pdev); 1488 1489 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) 1490 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); 1491 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) 1492 rom_size = 0x20000; 1493 1494 if (rom_size && pdev->rom_attr) { 1495 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); 1496 kfree(pdev->rom_attr); 1497 } 1498 1499 pci_remove_firmware_label_files(pdev); 1500 1501 } 1502 1503 static int __init pci_sysfs_init(void) 1504 { 1505 struct pci_dev *pdev = NULL; 1506 int retval; 1507 1508 sysfs_initialized = 1; 1509 for_each_pci_dev(pdev) { 1510 retval = pci_create_sysfs_dev_files(pdev); 1511 if (retval) { 1512 pci_dev_put(pdev); 1513 return retval; 1514 } 1515 } 1516 1517 return 0; 1518 } 1519 late_initcall(pci_sysfs_init); 1520 1521 static struct attribute *pci_dev_dev_attrs[] = { 1522 &vga_attr.attr, 1523 NULL, 1524 }; 1525 1526 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj, 1527 struct attribute *a, int n) 1528 { 1529 struct device *dev = container_of(kobj, struct device, kobj); 1530 struct pci_dev *pdev = to_pci_dev(dev); 1531 1532 if (a == &vga_attr.attr) 1533 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 1534 return 0; 1535 1536 return a->mode; 1537 } 1538 1539 static struct attribute *pci_dev_hp_attrs[] = { 1540 &dev_remove_attr.attr, 1541 &dev_rescan_attr.attr, 1542 NULL, 1543 }; 1544 1545 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj, 1546 struct attribute *a, int n) 1547 { 1548 struct device *dev = container_of(kobj, struct device, kobj); 1549 struct pci_dev *pdev = to_pci_dev(dev); 1550 1551 if (pdev->is_virtfn) 1552 return 0; 1553 1554 return a->mode; 1555 } 1556 1557 static struct attribute_group pci_dev_hp_attr_group = { 1558 .attrs = pci_dev_hp_attrs, 1559 .is_visible = pci_dev_hp_attrs_are_visible, 1560 }; 1561 1562 #ifdef CONFIG_PCI_IOV 1563 static struct attribute *sriov_dev_attrs[] = { 1564 &sriov_totalvfs_attr.attr, 1565 &sriov_numvfs_attr.attr, 1566 NULL, 1567 }; 1568 1569 static umode_t sriov_attrs_are_visible(struct kobject *kobj, 1570 struct attribute *a, int n) 1571 { 1572 struct device *dev = container_of(kobj, struct device, kobj); 1573 1574 if (!dev_is_pf(dev)) 1575 return 0; 1576 1577 return a->mode; 1578 } 1579 1580 static struct attribute_group sriov_dev_attr_group = { 1581 .attrs = sriov_dev_attrs, 1582 .is_visible = sriov_attrs_are_visible, 1583 }; 1584 #endif /* CONFIG_PCI_IOV */ 1585 1586 static struct attribute_group pci_dev_attr_group = { 1587 .attrs = pci_dev_dev_attrs, 1588 .is_visible = pci_dev_attrs_are_visible, 1589 }; 1590 1591 static const struct attribute_group *pci_dev_attr_groups[] = { 1592 &pci_dev_attr_group, 1593 &pci_dev_hp_attr_group, 1594 #ifdef CONFIG_PCI_IOV 1595 &sriov_dev_attr_group, 1596 #endif 1597 NULL, 1598 }; 1599 1600 struct device_type pci_dev_type = { 1601 .groups = pci_dev_attr_groups, 1602 }; 1603