1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * PCI Endpoint *Controller* (EPC) library 4 * 5 * Copyright (C) 2017 Texas Instruments 6 * Author: Kishon Vijay Abraham I <kishon@ti.com> 7 */ 8 9 #include <linux/device.h> 10 #include <linux/slab.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 14 #include <linux/pci-epc.h> 15 #include <linux/pci-epf.h> 16 #include <linux/pci-ep-cfs.h> 17 18 static struct class *pci_epc_class; 19 20 static void devm_pci_epc_release(struct device *dev, void *res) 21 { 22 struct pci_epc *epc = *(struct pci_epc **)res; 23 24 pci_epc_destroy(epc); 25 } 26 27 static int devm_pci_epc_match(struct device *dev, void *res, void *match_data) 28 { 29 struct pci_epc **epc = res; 30 31 return *epc == match_data; 32 } 33 34 /** 35 * pci_epc_put() - release the PCI endpoint controller 36 * @epc: epc returned by pci_epc_get() 37 * 38 * release the refcount the caller obtained by invoking pci_epc_get() 39 */ 40 void pci_epc_put(struct pci_epc *epc) 41 { 42 if (!epc || IS_ERR(epc)) 43 return; 44 45 module_put(epc->ops->owner); 46 put_device(&epc->dev); 47 } 48 EXPORT_SYMBOL_GPL(pci_epc_put); 49 50 /** 51 * pci_epc_get() - get the PCI endpoint controller 52 * @epc_name: device name of the endpoint controller 53 * 54 * Invoke to get struct pci_epc * corresponding to the device name of the 55 * endpoint controller 56 */ 57 struct pci_epc *pci_epc_get(const char *epc_name) 58 { 59 int ret = -EINVAL; 60 struct pci_epc *epc; 61 struct device *dev; 62 struct class_dev_iter iter; 63 64 class_dev_iter_init(&iter, pci_epc_class, NULL, NULL); 65 while ((dev = class_dev_iter_next(&iter))) { 66 if (strcmp(epc_name, dev_name(dev))) 67 continue; 68 69 epc = to_pci_epc(dev); 70 if (!try_module_get(epc->ops->owner)) { 71 ret = -EINVAL; 72 goto err; 73 } 74 75 class_dev_iter_exit(&iter); 76 get_device(&epc->dev); 77 return epc; 78 } 79 80 err: 81 class_dev_iter_exit(&iter); 82 return ERR_PTR(ret); 83 } 84 EXPORT_SYMBOL_GPL(pci_epc_get); 85 86 /** 87 * pci_epc_get_first_free_bar() - helper to get first unreserved BAR 88 * @epc_features: pci_epc_features structure that holds the reserved bar bitmap 89 * 90 * Invoke to get the first unreserved BAR that can be used by the endpoint 91 * function. For any incorrect value in reserved_bar return '0'. 92 */ 93 enum pci_barno 94 pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features) 95 { 96 return pci_epc_get_next_free_bar(epc_features, BAR_0); 97 } 98 EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar); 99 100 /** 101 * pci_epc_get_next_free_bar() - helper to get unreserved BAR starting from @bar 102 * @epc_features: pci_epc_features structure that holds the reserved bar bitmap 103 * @bar: the starting BAR number from where unreserved BAR should be searched 104 * 105 * Invoke to get the next unreserved BAR starting from @bar that can be used 106 * for endpoint function. For any incorrect value in reserved_bar return '0'. 107 */ 108 enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features 109 *epc_features, enum pci_barno bar) 110 { 111 unsigned long free_bar; 112 113 if (!epc_features) 114 return BAR_0; 115 116 /* If 'bar - 1' is a 64-bit BAR, move to the next BAR */ 117 if ((epc_features->bar_fixed_64bit << 1) & 1 << bar) 118 bar++; 119 120 /* Find if the reserved BAR is also a 64-bit BAR */ 121 free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit; 122 123 /* Set the adjacent bit if the reserved BAR is also a 64-bit BAR */ 124 free_bar <<= 1; 125 free_bar |= epc_features->reserved_bar; 126 127 free_bar = find_next_zero_bit(&free_bar, 6, bar); 128 if (free_bar > 5) 129 return NO_BAR; 130 131 return free_bar; 132 } 133 EXPORT_SYMBOL_GPL(pci_epc_get_next_free_bar); 134 135 /** 136 * pci_epc_get_features() - get the features supported by EPC 137 * @epc: the features supported by *this* EPC device will be returned 138 * @func_no: the features supported by the EPC device specific to the 139 * endpoint function with func_no will be returned 140 * 141 * Invoke to get the features provided by the EPC which may be 142 * specific to an endpoint function. Returns pci_epc_features on success 143 * and NULL for any failures. 144 */ 145 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc, 146 u8 func_no) 147 { 148 const struct pci_epc_features *epc_features; 149 150 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 151 return NULL; 152 153 if (!epc->ops->get_features) 154 return NULL; 155 156 mutex_lock(&epc->lock); 157 epc_features = epc->ops->get_features(epc, func_no); 158 mutex_unlock(&epc->lock); 159 160 return epc_features; 161 } 162 EXPORT_SYMBOL_GPL(pci_epc_get_features); 163 164 /** 165 * pci_epc_stop() - stop the PCI link 166 * @epc: the link of the EPC device that has to be stopped 167 * 168 * Invoke to stop the PCI link 169 */ 170 void pci_epc_stop(struct pci_epc *epc) 171 { 172 if (IS_ERR(epc) || !epc->ops->stop) 173 return; 174 175 mutex_lock(&epc->lock); 176 epc->ops->stop(epc); 177 mutex_unlock(&epc->lock); 178 } 179 EXPORT_SYMBOL_GPL(pci_epc_stop); 180 181 /** 182 * pci_epc_start() - start the PCI link 183 * @epc: the link of *this* EPC device has to be started 184 * 185 * Invoke to start the PCI link 186 */ 187 int pci_epc_start(struct pci_epc *epc) 188 { 189 int ret; 190 191 if (IS_ERR(epc)) 192 return -EINVAL; 193 194 if (!epc->ops->start) 195 return 0; 196 197 mutex_lock(&epc->lock); 198 ret = epc->ops->start(epc); 199 mutex_unlock(&epc->lock); 200 201 return ret; 202 } 203 EXPORT_SYMBOL_GPL(pci_epc_start); 204 205 /** 206 * pci_epc_raise_irq() - interrupt the host system 207 * @epc: the EPC device which has to interrupt the host 208 * @func_no: the endpoint function number in the EPC device 209 * @type: specify the type of interrupt; legacy, MSI or MSI-X 210 * @interrupt_num: the MSI or MSI-X interrupt number 211 * 212 * Invoke to raise an legacy, MSI or MSI-X interrupt 213 */ 214 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, 215 enum pci_epc_irq_type type, u16 interrupt_num) 216 { 217 int ret; 218 219 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 220 return -EINVAL; 221 222 if (!epc->ops->raise_irq) 223 return 0; 224 225 mutex_lock(&epc->lock); 226 ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num); 227 mutex_unlock(&epc->lock); 228 229 return ret; 230 } 231 EXPORT_SYMBOL_GPL(pci_epc_raise_irq); 232 233 /** 234 * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated 235 * @epc: the EPC device to which MSI interrupts was requested 236 * @func_no: the endpoint function number in the EPC device 237 * 238 * Invoke to get the number of MSI interrupts allocated by the RC 239 */ 240 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no) 241 { 242 int interrupt; 243 244 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 245 return 0; 246 247 if (!epc->ops->get_msi) 248 return 0; 249 250 mutex_lock(&epc->lock); 251 interrupt = epc->ops->get_msi(epc, func_no); 252 mutex_unlock(&epc->lock); 253 254 if (interrupt < 0) 255 return 0; 256 257 interrupt = 1 << interrupt; 258 259 return interrupt; 260 } 261 EXPORT_SYMBOL_GPL(pci_epc_get_msi); 262 263 /** 264 * pci_epc_set_msi() - set the number of MSI interrupt numbers required 265 * @epc: the EPC device on which MSI has to be configured 266 * @func_no: the endpoint function number in the EPC device 267 * @interrupts: number of MSI interrupts required by the EPF 268 * 269 * Invoke to set the required number of MSI interrupts. 270 */ 271 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts) 272 { 273 int ret; 274 u8 encode_int; 275 276 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 277 interrupts > 32) 278 return -EINVAL; 279 280 if (!epc->ops->set_msi) 281 return 0; 282 283 encode_int = order_base_2(interrupts); 284 285 mutex_lock(&epc->lock); 286 ret = epc->ops->set_msi(epc, func_no, encode_int); 287 mutex_unlock(&epc->lock); 288 289 return ret; 290 } 291 EXPORT_SYMBOL_GPL(pci_epc_set_msi); 292 293 /** 294 * pci_epc_get_msix() - get the number of MSI-X interrupt numbers allocated 295 * @epc: the EPC device to which MSI-X interrupts was requested 296 * @func_no: the endpoint function number in the EPC device 297 * 298 * Invoke to get the number of MSI-X interrupts allocated by the RC 299 */ 300 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no) 301 { 302 int interrupt; 303 304 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 305 return 0; 306 307 if (!epc->ops->get_msix) 308 return 0; 309 310 mutex_lock(&epc->lock); 311 interrupt = epc->ops->get_msix(epc, func_no); 312 mutex_unlock(&epc->lock); 313 314 if (interrupt < 0) 315 return 0; 316 317 return interrupt + 1; 318 } 319 EXPORT_SYMBOL_GPL(pci_epc_get_msix); 320 321 /** 322 * pci_epc_set_msix() - set the number of MSI-X interrupt numbers required 323 * @epc: the EPC device on which MSI-X has to be configured 324 * @func_no: the endpoint function number in the EPC device 325 * @interrupts: number of MSI-X interrupts required by the EPF 326 * @bir: BAR where the MSI-X table resides 327 * @offset: Offset pointing to the start of MSI-X table 328 * 329 * Invoke to set the required number of MSI-X interrupts. 330 */ 331 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts, 332 enum pci_barno bir, u32 offset) 333 { 334 int ret; 335 336 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 337 interrupts < 1 || interrupts > 2048) 338 return -EINVAL; 339 340 if (!epc->ops->set_msix) 341 return 0; 342 343 mutex_lock(&epc->lock); 344 ret = epc->ops->set_msix(epc, func_no, interrupts - 1, bir, offset); 345 mutex_unlock(&epc->lock); 346 347 return ret; 348 } 349 EXPORT_SYMBOL_GPL(pci_epc_set_msix); 350 351 /** 352 * pci_epc_unmap_addr() - unmap CPU address from PCI address 353 * @epc: the EPC device on which address is allocated 354 * @func_no: the endpoint function number in the EPC device 355 * @phys_addr: physical address of the local system 356 * 357 * Invoke to unmap the CPU address from PCI address. 358 */ 359 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, 360 phys_addr_t phys_addr) 361 { 362 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 363 return; 364 365 if (!epc->ops->unmap_addr) 366 return; 367 368 mutex_lock(&epc->lock); 369 epc->ops->unmap_addr(epc, func_no, phys_addr); 370 mutex_unlock(&epc->lock); 371 } 372 EXPORT_SYMBOL_GPL(pci_epc_unmap_addr); 373 374 /** 375 * pci_epc_map_addr() - map CPU address to PCI address 376 * @epc: the EPC device on which address is allocated 377 * @func_no: the endpoint function number in the EPC device 378 * @phys_addr: physical address of the local system 379 * @pci_addr: PCI address to which the physical address should be mapped 380 * @size: the size of the allocation 381 * 382 * Invoke to map CPU address with PCI address. 383 */ 384 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, 385 phys_addr_t phys_addr, u64 pci_addr, size_t size) 386 { 387 int ret; 388 389 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 390 return -EINVAL; 391 392 if (!epc->ops->map_addr) 393 return 0; 394 395 mutex_lock(&epc->lock); 396 ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size); 397 mutex_unlock(&epc->lock); 398 399 return ret; 400 } 401 EXPORT_SYMBOL_GPL(pci_epc_map_addr); 402 403 /** 404 * pci_epc_clear_bar() - reset the BAR 405 * @epc: the EPC device for which the BAR has to be cleared 406 * @func_no: the endpoint function number in the EPC device 407 * @epf_bar: the struct epf_bar that contains the BAR information 408 * 409 * Invoke to reset the BAR of the endpoint device. 410 */ 411 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, 412 struct pci_epf_bar *epf_bar) 413 { 414 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 415 (epf_bar->barno == BAR_5 && 416 epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)) 417 return; 418 419 if (!epc->ops->clear_bar) 420 return; 421 422 mutex_lock(&epc->lock); 423 epc->ops->clear_bar(epc, func_no, epf_bar); 424 mutex_unlock(&epc->lock); 425 } 426 EXPORT_SYMBOL_GPL(pci_epc_clear_bar); 427 428 /** 429 * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space 430 * @epc: the EPC device on which BAR has to be configured 431 * @func_no: the endpoint function number in the EPC device 432 * @epf_bar: the struct epf_bar that contains the BAR information 433 * 434 * Invoke to configure the BAR of the endpoint device. 435 */ 436 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, 437 struct pci_epf_bar *epf_bar) 438 { 439 int ret; 440 int flags = epf_bar->flags; 441 442 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 443 (epf_bar->barno == BAR_5 && 444 flags & PCI_BASE_ADDRESS_MEM_TYPE_64) || 445 (flags & PCI_BASE_ADDRESS_SPACE_IO && 446 flags & PCI_BASE_ADDRESS_IO_MASK) || 447 (upper_32_bits(epf_bar->size) && 448 !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64))) 449 return -EINVAL; 450 451 if (!epc->ops->set_bar) 452 return 0; 453 454 mutex_lock(&epc->lock); 455 ret = epc->ops->set_bar(epc, func_no, epf_bar); 456 mutex_unlock(&epc->lock); 457 458 return ret; 459 } 460 EXPORT_SYMBOL_GPL(pci_epc_set_bar); 461 462 /** 463 * pci_epc_write_header() - write standard configuration header 464 * @epc: the EPC device to which the configuration header should be written 465 * @func_no: the endpoint function number in the EPC device 466 * @header: standard configuration header fields 467 * 468 * Invoke to write the configuration header to the endpoint controller. Every 469 * endpoint controller will have a dedicated location to which the standard 470 * configuration header would be written. The callback function should write 471 * the header fields to this dedicated location. 472 */ 473 int pci_epc_write_header(struct pci_epc *epc, u8 func_no, 474 struct pci_epf_header *header) 475 { 476 int ret; 477 478 if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 479 return -EINVAL; 480 481 if (!epc->ops->write_header) 482 return 0; 483 484 mutex_lock(&epc->lock); 485 ret = epc->ops->write_header(epc, func_no, header); 486 mutex_unlock(&epc->lock); 487 488 return ret; 489 } 490 EXPORT_SYMBOL_GPL(pci_epc_write_header); 491 492 /** 493 * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller 494 * @epc: the EPC device to which the endpoint function should be added 495 * @epf: the endpoint function to be added 496 * @type: Identifies if the EPC is connected to the primary or secondary 497 * interface of EPF 498 * 499 * A PCI endpoint device can have one or more functions. In the case of PCIe, 500 * the specification allows up to 8 PCIe endpoint functions. Invoke 501 * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller. 502 */ 503 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, 504 enum pci_epc_interface_type type) 505 { 506 struct list_head *list; 507 u32 func_no; 508 int ret = 0; 509 510 if (IS_ERR_OR_NULL(epc)) 511 return -EINVAL; 512 513 if (type == PRIMARY_INTERFACE && epf->epc) 514 return -EBUSY; 515 516 if (type == SECONDARY_INTERFACE && epf->sec_epc) 517 return -EBUSY; 518 519 mutex_lock(&epc->lock); 520 func_no = find_first_zero_bit(&epc->function_num_map, 521 BITS_PER_LONG); 522 if (func_no >= BITS_PER_LONG) { 523 ret = -EINVAL; 524 goto ret; 525 } 526 527 if (func_no > epc->max_functions - 1) { 528 dev_err(&epc->dev, "Exceeding max supported Function Number\n"); 529 ret = -EINVAL; 530 goto ret; 531 } 532 533 set_bit(func_no, &epc->function_num_map); 534 if (type == PRIMARY_INTERFACE) { 535 epf->func_no = func_no; 536 epf->epc = epc; 537 list = &epf->list; 538 } else { 539 epf->sec_epc_func_no = func_no; 540 epf->sec_epc = epc; 541 list = &epf->sec_epc_list; 542 } 543 544 list_add_tail(list, &epc->pci_epf); 545 ret: 546 mutex_unlock(&epc->lock); 547 548 return ret; 549 } 550 EXPORT_SYMBOL_GPL(pci_epc_add_epf); 551 552 /** 553 * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller 554 * @epc: the EPC device from which the endpoint function should be removed 555 * @epf: the endpoint function to be removed 556 * 557 * Invoke to remove PCI endpoint function from the endpoint controller. 558 */ 559 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf, 560 enum pci_epc_interface_type type) 561 { 562 struct list_head *list; 563 u32 func_no = 0; 564 565 if (!epc || IS_ERR(epc) || !epf) 566 return; 567 568 if (type == PRIMARY_INTERFACE) { 569 func_no = epf->func_no; 570 list = &epf->list; 571 } else { 572 func_no = epf->sec_epc_func_no; 573 list = &epf->sec_epc_list; 574 } 575 576 mutex_lock(&epc->lock); 577 clear_bit(func_no, &epc->function_num_map); 578 list_del(list); 579 epf->epc = NULL; 580 mutex_unlock(&epc->lock); 581 } 582 EXPORT_SYMBOL_GPL(pci_epc_remove_epf); 583 584 /** 585 * pci_epc_linkup() - Notify the EPF device that EPC device has established a 586 * connection with the Root Complex. 587 * @epc: the EPC device which has established link with the host 588 * 589 * Invoke to Notify the EPF device that the EPC device has established a 590 * connection with the Root Complex. 591 */ 592 void pci_epc_linkup(struct pci_epc *epc) 593 { 594 if (!epc || IS_ERR(epc)) 595 return; 596 597 atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL); 598 } 599 EXPORT_SYMBOL_GPL(pci_epc_linkup); 600 601 /** 602 * pci_epc_init_notify() - Notify the EPF device that EPC device's core 603 * initialization is completed. 604 * @epc: the EPC device whose core initialization is completeds 605 * 606 * Invoke to Notify the EPF device that the EPC device's initialization 607 * is completed. 608 */ 609 void pci_epc_init_notify(struct pci_epc *epc) 610 { 611 if (!epc || IS_ERR(epc)) 612 return; 613 614 atomic_notifier_call_chain(&epc->notifier, CORE_INIT, NULL); 615 } 616 EXPORT_SYMBOL_GPL(pci_epc_init_notify); 617 618 /** 619 * pci_epc_destroy() - destroy the EPC device 620 * @epc: the EPC device that has to be destroyed 621 * 622 * Invoke to destroy the PCI EPC device 623 */ 624 void pci_epc_destroy(struct pci_epc *epc) 625 { 626 pci_ep_cfs_remove_epc_group(epc->group); 627 device_unregister(&epc->dev); 628 kfree(epc); 629 } 630 EXPORT_SYMBOL_GPL(pci_epc_destroy); 631 632 /** 633 * devm_pci_epc_destroy() - destroy the EPC device 634 * @dev: device that wants to destroy the EPC 635 * @epc: the EPC device that has to be destroyed 636 * 637 * Invoke to destroy the devres associated with this 638 * pci_epc and destroy the EPC device. 639 */ 640 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc) 641 { 642 int r; 643 644 r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match, 645 epc); 646 dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n"); 647 } 648 EXPORT_SYMBOL_GPL(devm_pci_epc_destroy); 649 650 /** 651 * __pci_epc_create() - create a new endpoint controller (EPC) device 652 * @dev: device that is creating the new EPC 653 * @ops: function pointers for performing EPC operations 654 * @owner: the owner of the module that creates the EPC device 655 * 656 * Invoke to create a new EPC device and add it to pci_epc class. 657 */ 658 struct pci_epc * 659 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 660 struct module *owner) 661 { 662 int ret; 663 struct pci_epc *epc; 664 665 if (WARN_ON(!dev)) { 666 ret = -EINVAL; 667 goto err_ret; 668 } 669 670 epc = kzalloc(sizeof(*epc), GFP_KERNEL); 671 if (!epc) { 672 ret = -ENOMEM; 673 goto err_ret; 674 } 675 676 mutex_init(&epc->lock); 677 INIT_LIST_HEAD(&epc->pci_epf); 678 ATOMIC_INIT_NOTIFIER_HEAD(&epc->notifier); 679 680 device_initialize(&epc->dev); 681 epc->dev.class = pci_epc_class; 682 epc->dev.parent = dev; 683 epc->ops = ops; 684 685 ret = dev_set_name(&epc->dev, "%s", dev_name(dev)); 686 if (ret) 687 goto put_dev; 688 689 ret = device_add(&epc->dev); 690 if (ret) 691 goto put_dev; 692 693 epc->group = pci_ep_cfs_add_epc_group(dev_name(dev)); 694 695 return epc; 696 697 put_dev: 698 put_device(&epc->dev); 699 kfree(epc); 700 701 err_ret: 702 return ERR_PTR(ret); 703 } 704 EXPORT_SYMBOL_GPL(__pci_epc_create); 705 706 /** 707 * __devm_pci_epc_create() - create a new endpoint controller (EPC) device 708 * @dev: device that is creating the new EPC 709 * @ops: function pointers for performing EPC operations 710 * @owner: the owner of the module that creates the EPC device 711 * 712 * Invoke to create a new EPC device and add it to pci_epc class. 713 * While at that, it also associates the device with the pci_epc using devres. 714 * On driver detach, release function is invoked on the devres data, 715 * then, devres data is freed. 716 */ 717 struct pci_epc * 718 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 719 struct module *owner) 720 { 721 struct pci_epc **ptr, *epc; 722 723 ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL); 724 if (!ptr) 725 return ERR_PTR(-ENOMEM); 726 727 epc = __pci_epc_create(dev, ops, owner); 728 if (!IS_ERR(epc)) { 729 *ptr = epc; 730 devres_add(dev, ptr); 731 } else { 732 devres_free(ptr); 733 } 734 735 return epc; 736 } 737 EXPORT_SYMBOL_GPL(__devm_pci_epc_create); 738 739 static int __init pci_epc_init(void) 740 { 741 pci_epc_class = class_create(THIS_MODULE, "pci_epc"); 742 if (IS_ERR(pci_epc_class)) { 743 pr_err("failed to create pci epc class --> %ld\n", 744 PTR_ERR(pci_epc_class)); 745 return PTR_ERR(pci_epc_class); 746 } 747 748 return 0; 749 } 750 module_init(pci_epc_init); 751 752 static void __exit pci_epc_exit(void) 753 { 754 class_destroy(pci_epc_class); 755 } 756 module_exit(pci_epc_exit); 757 758 MODULE_DESCRIPTION("PCI EPC Library"); 759 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); 760 MODULE_LICENSE("GPL v2"); 761