1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Purpose: PCI Express Port Bus Driver 4 * 5 * Copyright (C) 2004 Intel 6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) 7 */ 8 9#include <linux/bitfield.h> 10#include <linux/dmi.h> 11#include <linux/init.h> 12#include <linux/module.h> 13#include <linux/pci.h> 14#include <linux/kernel.h> 15#include <linux/errno.h> 16#include <linux/pm.h> 17#include <linux/pm_runtime.h> 18#include <linux/string.h> 19#include <linux/slab.h> 20#include <linux/aer.h> 21 22#include "../pci.h" 23#include "portdrv.h" 24 25/* 26 * The PCIe Capability Interrupt Message Number (PCIe r3.1, sec 7.8.2) must 27 * be one of the first 32 MSI-X entries. Per PCI r3.0, sec 6.8.3.1, MSI 28 * supports a maximum of 32 vectors per function. 29 */ 30#define PCIE_PORT_MAX_MSI_ENTRIES 32 31 32#define get_descriptor_id(type, service) (((type - 4) << 8) | service) 33 34struct portdrv_service_data { 35 struct pcie_port_service_driver *drv; 36 struct device *dev; 37 u32 service; 38}; 39 40/** 41 * release_pcie_device - free PCI Express port service device structure 42 * @dev: Port service device to release 43 * 44 * Invoked automatically when device is being removed in response to 45 * device_unregister(dev). Release all resources being claimed. 46 */ 47static void release_pcie_device(struct device *dev) 48{ 49 kfree(to_pcie_device(dev)); 50} 51 52/* 53 * Fill in *pme, *aer, *dpc with the relevant Interrupt Message Numbers if 54 * services are enabled in "mask". Return the number of MSI/MSI-X vectors 55 * required to accommodate the largest Message Number. 56 */ 57static int pcie_message_numbers(struct pci_dev *dev, int mask, 58 u32 *pme, u32 *aer, u32 *dpc) 59{ 60 u32 nvec = 0, pos; 61 u16 reg16; 62 63 /* 64 * The Interrupt Message Number indicates which vector is used, i.e., 65 * the MSI-X table entry or the MSI offset between the base Message 66 * Data and the generated interrupt message. See PCIe r3.1, sec 67 * 7.8.2, 7.10.10, 7.31.2. 68 */ 69 70 if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP | 71 PCIE_PORT_SERVICE_BWNOTIF)) { 72 pcie_capability_read_word(dev, PCI_EXP_FLAGS, ®16); 73 *pme = FIELD_GET(PCI_EXP_FLAGS_IRQ, reg16); 74 nvec = *pme + 1; 75 } 76 77#ifdef CONFIG_PCIEAER 78 if (mask & PCIE_PORT_SERVICE_AER) { 79 u32 reg32; 80 81 pos = dev->aer_cap; 82 if (pos) { 83 pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, 84 ®32); 85 *aer = FIELD_GET(PCI_ERR_ROOT_AER_IRQ, reg32); 86 nvec = max(nvec, *aer + 1); 87 } 88 } 89#endif 90 91 if (mask & PCIE_PORT_SERVICE_DPC) { 92 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC); 93 if (pos) { 94 pci_read_config_word(dev, pos + PCI_EXP_DPC_CAP, 95 ®16); 96 *dpc = FIELD_GET(PCI_EXP_DPC_IRQ, reg16); 97 nvec = max(nvec, *dpc + 1); 98 } 99 } 100 101 return nvec; 102} 103 104/** 105 * pcie_port_enable_irq_vec - try to set up MSI-X or MSI as interrupt mode 106 * for given port 107 * @dev: PCI Express port to handle 108 * @irqs: Array of interrupt vectors to populate 109 * @mask: Bitmask of port capabilities returned by get_port_device_capability() 110 * 111 * Return value: 0 on success, error code on failure 112 */ 113static int pcie_port_enable_irq_vec(struct pci_dev *dev, int *irqs, int mask) 114{ 115 int nr_entries, nvec, pcie_irq; 116 u32 pme = 0, aer = 0, dpc = 0; 117 118 /* Allocate the maximum possible number of MSI/MSI-X vectors */ 119 nr_entries = pci_alloc_irq_vectors(dev, 1, PCIE_PORT_MAX_MSI_ENTRIES, 120 PCI_IRQ_MSIX | PCI_IRQ_MSI); 121 if (nr_entries < 0) 122 return nr_entries; 123 124 /* See how many and which Interrupt Message Numbers we actually use */ 125 nvec = pcie_message_numbers(dev, mask, &pme, &aer, &dpc); 126 if (nvec > nr_entries) { 127 pci_free_irq_vectors(dev); 128 return -EIO; 129 } 130 131 /* 132 * If we allocated more than we need, free them and reallocate fewer. 133 * 134 * Reallocating may change the specific vectors we get, so 135 * pci_irq_vector() must be done *after* the reallocation. 136 * 137 * If we're using MSI, hardware is *allowed* to change the Interrupt 138 * Message Numbers when we free and reallocate the vectors, but we 139 * assume it won't because we allocate enough vectors for the 140 * biggest Message Number we found. 141 */ 142 if (nvec != nr_entries) { 143 pci_free_irq_vectors(dev); 144 145 nr_entries = pci_alloc_irq_vectors(dev, nvec, nvec, 146 PCI_IRQ_MSIX | PCI_IRQ_MSI); 147 if (nr_entries < 0) 148 return nr_entries; 149 } 150 151 /* PME, hotplug and bandwidth notification share an MSI/MSI-X vector */ 152 if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP | 153 PCIE_PORT_SERVICE_BWNOTIF)) { 154 pcie_irq = pci_irq_vector(dev, pme); 155 irqs[PCIE_PORT_SERVICE_PME_SHIFT] = pcie_irq; 156 irqs[PCIE_PORT_SERVICE_HP_SHIFT] = pcie_irq; 157 irqs[PCIE_PORT_SERVICE_BWNOTIF_SHIFT] = pcie_irq; 158 } 159 160 if (mask & PCIE_PORT_SERVICE_AER) 161 irqs[PCIE_PORT_SERVICE_AER_SHIFT] = pci_irq_vector(dev, aer); 162 163 if (mask & PCIE_PORT_SERVICE_DPC) 164 irqs[PCIE_PORT_SERVICE_DPC_SHIFT] = pci_irq_vector(dev, dpc); 165 166 return 0; 167} 168 169/** 170 * pcie_init_service_irqs - initialize irqs for PCI Express port services 171 * @dev: PCI Express port to handle 172 * @irqs: Array of irqs to populate 173 * @mask: Bitmask of port capabilities returned by get_port_device_capability() 174 * 175 * Return value: Interrupt mode associated with the port 176 */ 177static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask) 178{ 179 int ret, i; 180 181 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) 182 irqs[i] = -1; 183 184 /* 185 * If we support PME but can't use MSI/MSI-X for it, we have to 186 * fall back to INTx or other interrupts, e.g., a system shared 187 * interrupt. 188 */ 189 if ((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi()) 190 goto legacy_irq; 191 192 /* Try to use MSI-X or MSI if supported */ 193 if (pcie_port_enable_irq_vec(dev, irqs, mask) == 0) 194 return 0; 195 196legacy_irq: 197 /* fall back to legacy IRQ */ 198 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY); 199 if (ret < 0) 200 return -ENODEV; 201 202 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) 203 irqs[i] = pci_irq_vector(dev, 0); 204 205 return 0; 206} 207 208/** 209 * get_port_device_capability - discover capabilities of a PCI Express port 210 * @dev: PCI Express port to examine 211 * 212 * The capabilities are read from the port's PCI Express configuration registers 213 * as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and 214 * 7.9 - 7.11. 215 * 216 * Return value: Bitmask of discovered port capabilities 217 */ 218static int get_port_device_capability(struct pci_dev *dev) 219{ 220 struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); 221 int services = 0; 222 223 if (dev->is_hotplug_bridge && 224 (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT || 225 pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM) && 226 (pcie_ports_native || host->native_pcie_hotplug)) { 227 services |= PCIE_PORT_SERVICE_HP; 228 229 /* 230 * Disable hot-plug interrupts in case they have been enabled 231 * by the BIOS and the hot-plug service driver is not loaded. 232 */ 233 pcie_capability_clear_word(dev, PCI_EXP_SLTCTL, 234 PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE); 235 } 236 237#ifdef CONFIG_PCIEAER 238 if ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT || 239 pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) && 240 dev->aer_cap && pci_aer_available() && 241 (pcie_ports_native || host->native_aer)) 242 services |= PCIE_PORT_SERVICE_AER; 243#endif 244 245 /* Root Ports and Root Complex Event Collectors may generate PMEs */ 246 if ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT || 247 pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) && 248 (pcie_ports_native || host->native_pme)) { 249 services |= PCIE_PORT_SERVICE_PME; 250 251 /* 252 * Disable PME interrupt on this port in case it's been enabled 253 * by the BIOS (the PME service driver will enable it when 254 * necessary). 255 */ 256 pcie_pme_interrupt_enable(dev, false); 257 } 258 259 /* 260 * With dpc-native, allow Linux to use DPC even if it doesn't have 261 * permission to use AER. 262 */ 263 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) && 264 pci_aer_available() && 265 (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER))) 266 services |= PCIE_PORT_SERVICE_DPC; 267 268 if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || 269 pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) { 270 u32 linkcap; 271 272 pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &linkcap); 273 if (linkcap & PCI_EXP_LNKCAP_LBNC) 274 services |= PCIE_PORT_SERVICE_BWNOTIF; 275 } 276 277 return services; 278} 279 280/** 281 * pcie_device_init - allocate and initialize PCI Express port service device 282 * @pdev: PCI Express port to associate the service device with 283 * @service: Type of service to associate with the service device 284 * @irq: Interrupt vector to associate with the service device 285 */ 286static int pcie_device_init(struct pci_dev *pdev, int service, int irq) 287{ 288 int retval; 289 struct pcie_device *pcie; 290 struct device *device; 291 292 pcie = kzalloc(sizeof(*pcie), GFP_KERNEL); 293 if (!pcie) 294 return -ENOMEM; 295 pcie->port = pdev; 296 pcie->irq = irq; 297 pcie->service = service; 298 299 /* Initialize generic device interface */ 300 device = &pcie->device; 301 device->bus = &pcie_port_bus_type; 302 device->release = release_pcie_device; /* callback to free pcie dev */ 303 dev_set_name(device, "%s:pcie%03x", 304 pci_name(pdev), 305 get_descriptor_id(pci_pcie_type(pdev), service)); 306 device->parent = &pdev->dev; 307 device_enable_async_suspend(device); 308 309 retval = device_register(device); 310 if (retval) { 311 put_device(device); 312 return retval; 313 } 314 315 pm_runtime_no_callbacks(device); 316 317 return 0; 318} 319 320/** 321 * pcie_port_device_register - register PCI Express port 322 * @dev: PCI Express port to register 323 * 324 * Allocate the port extension structure and register services associated with 325 * the port. 326 */ 327static int pcie_port_device_register(struct pci_dev *dev) 328{ 329 int status, capabilities, i, nr_service; 330 int irqs[PCIE_PORT_DEVICE_MAXSERVICES]; 331 332 /* Enable PCI Express port device */ 333 status = pci_enable_device(dev); 334 if (status) 335 return status; 336 337 /* Get and check PCI Express port services */ 338 capabilities = get_port_device_capability(dev); 339 if (!capabilities) 340 return 0; 341 342 pci_set_master(dev); 343 /* 344 * Initialize service irqs. Don't use service devices that 345 * require interrupts if there is no way to generate them. 346 * However, some drivers may have a polling mode (e.g. pciehp_poll_mode) 347 * that can be used in the absence of irqs. Allow them to determine 348 * if that is to be used. 349 */ 350 status = pcie_init_service_irqs(dev, irqs, capabilities); 351 if (status) { 352 capabilities &= PCIE_PORT_SERVICE_HP; 353 if (!capabilities) 354 goto error_disable; 355 } 356 357 /* Allocate child services if any */ 358 status = -ENODEV; 359 nr_service = 0; 360 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) { 361 int service = 1 << i; 362 if (!(capabilities & service)) 363 continue; 364 if (!pcie_device_init(dev, service, irqs[i])) 365 nr_service++; 366 } 367 if (!nr_service) 368 goto error_cleanup_irqs; 369 370 return 0; 371 372error_cleanup_irqs: 373 pci_free_irq_vectors(dev); 374error_disable: 375 pci_disable_device(dev); 376 return status; 377} 378 379typedef int (*pcie_callback_t)(struct pcie_device *); 380 381static int pcie_port_device_iter(struct device *dev, void *data) 382{ 383 struct pcie_port_service_driver *service_driver; 384 size_t offset = *(size_t *)data; 385 pcie_callback_t cb; 386 387 if ((dev->bus == &pcie_port_bus_type) && dev->driver) { 388 service_driver = to_service_driver(dev->driver); 389 cb = *(pcie_callback_t *)((void *)service_driver + offset); 390 if (cb) 391 return cb(to_pcie_device(dev)); 392 } 393 return 0; 394} 395 396#ifdef CONFIG_PM 397/** 398 * pcie_port_device_suspend - suspend port services associated with a PCIe port 399 * @dev: PCI Express port to handle 400 */ 401static int pcie_port_device_suspend(struct device *dev) 402{ 403 size_t off = offsetof(struct pcie_port_service_driver, suspend); 404 return device_for_each_child(dev, &off, pcie_port_device_iter); 405} 406 407static int pcie_port_device_resume_noirq(struct device *dev) 408{ 409 size_t off = offsetof(struct pcie_port_service_driver, resume_noirq); 410 return device_for_each_child(dev, &off, pcie_port_device_iter); 411} 412 413/** 414 * pcie_port_device_resume - resume port services associated with a PCIe port 415 * @dev: PCI Express port to handle 416 */ 417static int pcie_port_device_resume(struct device *dev) 418{ 419 size_t off = offsetof(struct pcie_port_service_driver, resume); 420 return device_for_each_child(dev, &off, pcie_port_device_iter); 421} 422 423/** 424 * pcie_port_device_runtime_suspend - runtime suspend port services 425 * @dev: PCI Express port to handle 426 */ 427static int pcie_port_device_runtime_suspend(struct device *dev) 428{ 429 size_t off = offsetof(struct pcie_port_service_driver, runtime_suspend); 430 return device_for_each_child(dev, &off, pcie_port_device_iter); 431} 432 433/** 434 * pcie_port_device_runtime_resume - runtime resume port services 435 * @dev: PCI Express port to handle 436 */ 437static int pcie_port_device_runtime_resume(struct device *dev) 438{ 439 size_t off = offsetof(struct pcie_port_service_driver, runtime_resume); 440 return device_for_each_child(dev, &off, pcie_port_device_iter); 441} 442#endif /* PM */ 443 444static int remove_iter(struct device *dev, void *data) 445{ 446 if (dev->bus == &pcie_port_bus_type) 447 device_unregister(dev); 448 return 0; 449} 450 451static int find_service_iter(struct device *device, void *data) 452{ 453 struct pcie_port_service_driver *service_driver; 454 struct portdrv_service_data *pdrvs; 455 u32 service; 456 457 pdrvs = (struct portdrv_service_data *) data; 458 service = pdrvs->service; 459 460 if (device->bus == &pcie_port_bus_type && device->driver) { 461 service_driver = to_service_driver(device->driver); 462 if (service_driver->service == service) { 463 pdrvs->drv = service_driver; 464 pdrvs->dev = device; 465 return 1; 466 } 467 } 468 469 return 0; 470} 471 472/** 473 * pcie_port_find_device - find the struct device 474 * @dev: PCI Express port the service is associated with 475 * @service: For the service to find 476 * 477 * Find the struct device associated with given service on a pci_dev 478 */ 479struct device *pcie_port_find_device(struct pci_dev *dev, 480 u32 service) 481{ 482 struct device *device; 483 struct portdrv_service_data pdrvs; 484 485 pdrvs.dev = NULL; 486 pdrvs.service = service; 487 device_for_each_child(&dev->dev, &pdrvs, find_service_iter); 488 489 device = pdrvs.dev; 490 return device; 491} 492EXPORT_SYMBOL_GPL(pcie_port_find_device); 493 494/** 495 * pcie_port_device_remove - unregister PCI Express port service devices 496 * @dev: PCI Express port the service devices to unregister are associated with 497 * 498 * Remove PCI Express port service devices associated with given port and 499 * disable MSI-X or MSI for the port. 500 */ 501static void pcie_port_device_remove(struct pci_dev *dev) 502{ 503 device_for_each_child(&dev->dev, NULL, remove_iter); 504 pci_free_irq_vectors(dev); 505} 506 507/** 508 * pcie_port_probe_service - probe driver for given PCI Express port service 509 * @dev: PCI Express port service device to probe against 510 * 511 * If PCI Express port service driver is registered with 512 * pcie_port_service_register(), this function will be called by the driver core 513 * whenever match is found between the driver and a port service device. 514 */ 515static int pcie_port_probe_service(struct device *dev) 516{ 517 struct pcie_device *pciedev; 518 struct pcie_port_service_driver *driver; 519 int status; 520 521 if (!dev || !dev->driver) 522 return -ENODEV; 523 524 driver = to_service_driver(dev->driver); 525 if (!driver || !driver->probe) 526 return -ENODEV; 527 528 pciedev = to_pcie_device(dev); 529 status = driver->probe(pciedev); 530 if (status) 531 return status; 532 533 get_device(dev); 534 return 0; 535} 536 537/** 538 * pcie_port_remove_service - detach driver from given PCI Express port service 539 * @dev: PCI Express port service device to handle 540 * 541 * If PCI Express port service driver is registered with 542 * pcie_port_service_register(), this function will be called by the driver core 543 * when device_unregister() is called for the port service device associated 544 * with the driver. 545 */ 546static int pcie_port_remove_service(struct device *dev) 547{ 548 struct pcie_device *pciedev; 549 struct pcie_port_service_driver *driver; 550 551 if (!dev || !dev->driver) 552 return 0; 553 554 pciedev = to_pcie_device(dev); 555 driver = to_service_driver(dev->driver); 556 if (driver && driver->remove) { 557 driver->remove(pciedev); 558 put_device(dev); 559 } 560 return 0; 561} 562 563/** 564 * pcie_port_shutdown_service - shut down given PCI Express port service 565 * @dev: PCI Express port service device to handle 566 * 567 * If PCI Express port service driver is registered with 568 * pcie_port_service_register(), this function will be called by the driver core 569 * when device_shutdown() is called for the port service device associated 570 * with the driver. 571 */ 572static void pcie_port_shutdown_service(struct device *dev) {} 573 574/** 575 * pcie_port_service_register - register PCI Express port service driver 576 * @new: PCI Express port service driver to register 577 */ 578int pcie_port_service_register(struct pcie_port_service_driver *new) 579{ 580 if (pcie_ports_disabled) 581 return -ENODEV; 582 583 new->driver.name = new->name; 584 new->driver.bus = &pcie_port_bus_type; 585 new->driver.probe = pcie_port_probe_service; 586 new->driver.remove = pcie_port_remove_service; 587 new->driver.shutdown = pcie_port_shutdown_service; 588 589 return driver_register(&new->driver); 590} 591 592/** 593 * pcie_port_service_unregister - unregister PCI Express port service driver 594 * @drv: PCI Express port service driver to unregister 595 */ 596void pcie_port_service_unregister(struct pcie_port_service_driver *drv) 597{ 598 driver_unregister(&drv->driver); 599} 600 601/* If this switch is set, PCIe port native services should not be enabled. */ 602bool pcie_ports_disabled; 603 604/* 605 * If the user specified "pcie_ports=native", use the PCIe services regardless 606 * of whether the platform has given us permission. On ACPI systems, this 607 * means we ignore _OSC. 608 */ 609bool pcie_ports_native; 610 611/* 612 * If the user specified "pcie_ports=dpc-native", use the Linux DPC PCIe 613 * service even if the platform hasn't given us permission. 614 */ 615bool pcie_ports_dpc_native; 616 617static int __init pcie_port_setup(char *str) 618{ 619 if (!strncmp(str, "compat", 6)) 620 pcie_ports_disabled = true; 621 else if (!strncmp(str, "native", 6)) 622 pcie_ports_native = true; 623 else if (!strncmp(str, "dpc-native", 10)) 624 pcie_ports_dpc_native = true; 625 626 return 1; 627} 628__setup("pcie_ports=", pcie_port_setup); 629 630/* global data */ 631 632#ifdef CONFIG_PM 633static int pcie_port_runtime_suspend(struct device *dev) 634{ 635 if (!to_pci_dev(dev)->bridge_d3) 636 return -EBUSY; 637 638 return pcie_port_device_runtime_suspend(dev); 639} 640 641static int pcie_port_runtime_idle(struct device *dev) 642{ 643 /* 644 * Assume the PCI core has set bridge_d3 whenever it thinks the port 645 * should be good to go to D3. Everything else, including moving 646 * the port to D3, is handled by the PCI core. 647 */ 648 return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY; 649} 650 651static const struct dev_pm_ops pcie_portdrv_pm_ops = { 652 .suspend = pcie_port_device_suspend, 653 .resume_noirq = pcie_port_device_resume_noirq, 654 .resume = pcie_port_device_resume, 655 .freeze = pcie_port_device_suspend, 656 .thaw = pcie_port_device_resume, 657 .poweroff = pcie_port_device_suspend, 658 .restore_noirq = pcie_port_device_resume_noirq, 659 .restore = pcie_port_device_resume, 660 .runtime_suspend = pcie_port_runtime_suspend, 661 .runtime_resume = pcie_port_device_runtime_resume, 662 .runtime_idle = pcie_port_runtime_idle, 663}; 664 665#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) 666 667#else /* !PM */ 668 669#define PCIE_PORTDRV_PM_OPS NULL 670#endif /* !PM */ 671 672/* 673 * pcie_portdrv_probe - Probe PCI-Express port devices 674 * @dev: PCI-Express port device being probed 675 * 676 * If detected invokes the pcie_port_device_register() method for 677 * this port device. 678 * 679 */ 680static int pcie_portdrv_probe(struct pci_dev *dev, 681 const struct pci_device_id *id) 682{ 683 int type = pci_pcie_type(dev); 684 int status; 685 686 if (!pci_is_pcie(dev) || 687 ((type != PCI_EXP_TYPE_ROOT_PORT) && 688 (type != PCI_EXP_TYPE_UPSTREAM) && 689 (type != PCI_EXP_TYPE_DOWNSTREAM) && 690 (type != PCI_EXP_TYPE_RC_EC))) 691 return -ENODEV; 692 693 if (type == PCI_EXP_TYPE_RC_EC) 694 pcie_link_rcec(dev); 695 696 status = pcie_port_device_register(dev); 697 if (status) 698 return status; 699 700 pci_save_state(dev); 701 702 dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE | 703 DPM_FLAG_SMART_SUSPEND); 704 705 if (pci_bridge_d3_possible(dev)) { 706 /* 707 * Keep the port resumed 100ms to make sure things like 708 * config space accesses from userspace (lspci) will not 709 * cause the port to repeatedly suspend and resume. 710 */ 711 pm_runtime_set_autosuspend_delay(&dev->dev, 100); 712 pm_runtime_use_autosuspend(&dev->dev); 713 pm_runtime_mark_last_busy(&dev->dev); 714 pm_runtime_put_autosuspend(&dev->dev); 715 pm_runtime_allow(&dev->dev); 716 } 717 718 return 0; 719} 720 721static void pcie_portdrv_remove(struct pci_dev *dev) 722{ 723 if (pci_bridge_d3_possible(dev)) { 724 pm_runtime_forbid(&dev->dev); 725 pm_runtime_get_noresume(&dev->dev); 726 pm_runtime_dont_use_autosuspend(&dev->dev); 727 } 728 729 pcie_port_device_remove(dev); 730 731 pci_disable_device(dev); 732} 733 734static void pcie_portdrv_shutdown(struct pci_dev *dev) 735{ 736 if (pci_bridge_d3_possible(dev)) { 737 pm_runtime_forbid(&dev->dev); 738 pm_runtime_get_noresume(&dev->dev); 739 pm_runtime_dont_use_autosuspend(&dev->dev); 740 } 741 742 pcie_port_device_remove(dev); 743} 744 745static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev, 746 pci_channel_state_t error) 747{ 748 if (error == pci_channel_io_frozen) 749 return PCI_ERS_RESULT_NEED_RESET; 750 return PCI_ERS_RESULT_CAN_RECOVER; 751} 752 753static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev) 754{ 755 size_t off = offsetof(struct pcie_port_service_driver, slot_reset); 756 device_for_each_child(&dev->dev, &off, pcie_port_device_iter); 757 758 pci_restore_state(dev); 759 pci_save_state(dev); 760 return PCI_ERS_RESULT_RECOVERED; 761} 762 763static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev) 764{ 765 return PCI_ERS_RESULT_RECOVERED; 766} 767 768/* 769 * LINUX Device Driver Model 770 */ 771static const struct pci_device_id port_pci_ids[] = { 772 /* handle any PCI-Express port */ 773 { PCI_DEVICE_CLASS(PCI_CLASS_BRIDGE_PCI_NORMAL, ~0) }, 774 /* subtractive decode PCI-to-PCI bridge, class type is 060401h */ 775 { PCI_DEVICE_CLASS(PCI_CLASS_BRIDGE_PCI_SUBTRACTIVE, ~0) }, 776 /* handle any Root Complex Event Collector */ 777 { PCI_DEVICE_CLASS(((PCI_CLASS_SYSTEM_RCEC << 8) | 0x00), ~0) }, 778 { }, 779}; 780 781static const struct pci_error_handlers pcie_portdrv_err_handler = { 782 .error_detected = pcie_portdrv_error_detected, 783 .slot_reset = pcie_portdrv_slot_reset, 784 .mmio_enabled = pcie_portdrv_mmio_enabled, 785}; 786 787static struct pci_driver pcie_portdriver = { 788 .name = "pcieport", 789 .id_table = &port_pci_ids[0], 790 791 .probe = pcie_portdrv_probe, 792 .remove = pcie_portdrv_remove, 793 .shutdown = pcie_portdrv_shutdown, 794 795 .err_handler = &pcie_portdrv_err_handler, 796 797 .driver_managed_dma = true, 798 799 .driver.pm = PCIE_PORTDRV_PM_OPS, 800}; 801 802static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d) 803{ 804 pr_notice("%s detected: will not use MSI for PCIe PME signaling\n", 805 d->ident); 806 pcie_pme_disable_msi(); 807 return 0; 808} 809 810static const struct dmi_system_id pcie_portdrv_dmi_table[] __initconst = { 811 /* 812 * Boxes that should not use MSI for PCIe PME signaling. 813 */ 814 { 815 .callback = dmi_pcie_pme_disable_msi, 816 .ident = "MSI Wind U-100", 817 .matches = { 818 DMI_MATCH(DMI_SYS_VENDOR, 819 "MICRO-STAR INTERNATIONAL CO., LTD"), 820 DMI_MATCH(DMI_PRODUCT_NAME, "U-100"), 821 }, 822 }, 823 {} 824}; 825 826static void __init pcie_init_services(void) 827{ 828 pcie_aer_init(); 829 pcie_pme_init(); 830 pcie_dpc_init(); 831 pcie_hp_init(); 832} 833 834static int __init pcie_portdrv_init(void) 835{ 836 if (pcie_ports_disabled) 837 return -EACCES; 838 839 pcie_init_services(); 840 dmi_check_system(pcie_portdrv_dmi_table); 841 842 return pci_register_driver(&pcie_portdriver); 843} 844device_initcall(pcie_portdrv_init); 845