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