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