| 1 | /* |
| 2 | * File: portdrv_core.c |
| 3 | * Purpose: PCI Express Port Bus Driver's Core Functions |
| 4 | * |
| 5 | * Copyright (C) 2004 Intel |
| 6 | * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) |
| 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/pci.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/pm.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/pcieport_if.h> |
| 17 | #include <linux/aer.h> |
| 18 | |
| 19 | #include "../pci.h" |
| 20 | #include "portdrv.h" |
| 21 | |
| 22 | bool pciehp_msi_disabled; |
| 23 | |
| 24 | static int __init pciehp_setup(char *str) |
| 25 | { |
| 26 | if (!strncmp(str, "nomsi", 5)) |
| 27 | pciehp_msi_disabled = true; |
| 28 | |
| 29 | return 1; |
| 30 | } |
| 31 | __setup("pcie_hp=", pciehp_setup); |
| 32 | |
| 33 | /** |
| 34 | * release_pcie_device - free PCI Express port service device structure |
| 35 | * @dev: Port service device to release |
| 36 | * |
| 37 | * Invoked automatically when device is being removed in response to |
| 38 | * device_unregister(dev). Release all resources being claimed. |
| 39 | */ |
| 40 | static void release_pcie_device(struct device *dev) |
| 41 | { |
| 42 | kfree(to_pcie_device(dev)); |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * pcie_port_msix_add_entry - add entry to given array of MSI-X entries |
| 47 | * @entries: Array of MSI-X entries |
| 48 | * @new_entry: Index of the entry to add to the array |
| 49 | * @nr_entries: Number of entries aleady in the array |
| 50 | * |
| 51 | * Return value: Position of the added entry in the array |
| 52 | */ |
| 53 | static int pcie_port_msix_add_entry( |
| 54 | struct msix_entry *entries, int new_entry, int nr_entries) |
| 55 | { |
| 56 | int j; |
| 57 | |
| 58 | for (j = 0; j < nr_entries; j++) |
| 59 | if (entries[j].entry == new_entry) |
| 60 | return j; |
| 61 | |
| 62 | entries[j].entry = new_entry; |
| 63 | return j; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * pcie_port_enable_msix - try to set up MSI-X as interrupt mode for given port |
| 68 | * @dev: PCI Express port to handle |
| 69 | * @vectors: Array of interrupt vectors to populate |
| 70 | * @mask: Bitmask of port capabilities returned by get_port_device_capability() |
| 71 | * |
| 72 | * Return value: 0 on success, error code on failure |
| 73 | */ |
| 74 | static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask) |
| 75 | { |
| 76 | struct msix_entry *msix_entries; |
| 77 | int idx[PCIE_PORT_DEVICE_MAXSERVICES]; |
| 78 | int nr_entries, status, pos, i, nvec; |
| 79 | u16 reg16; |
| 80 | u32 reg32; |
| 81 | |
| 82 | nr_entries = pci_msix_table_size(dev); |
| 83 | if (!nr_entries) |
| 84 | return -EINVAL; |
| 85 | if (nr_entries > PCIE_PORT_MAX_MSIX_ENTRIES) |
| 86 | nr_entries = PCIE_PORT_MAX_MSIX_ENTRIES; |
| 87 | |
| 88 | msix_entries = kzalloc(sizeof(*msix_entries) * nr_entries, GFP_KERNEL); |
| 89 | if (!msix_entries) |
| 90 | return -ENOMEM; |
| 91 | |
| 92 | /* |
| 93 | * Allocate as many entries as the port wants, so that we can check |
| 94 | * which of them will be useful. Moreover, if nr_entries is correctly |
| 95 | * equal to the number of entries this port actually uses, we'll happily |
| 96 | * go through without any tricks. |
| 97 | */ |
| 98 | for (i = 0; i < nr_entries; i++) |
| 99 | msix_entries[i].entry = i; |
| 100 | |
| 101 | status = pci_enable_msix(dev, msix_entries, nr_entries); |
| 102 | if (status) |
| 103 | goto Exit; |
| 104 | |
| 105 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) |
| 106 | idx[i] = -1; |
| 107 | status = -EIO; |
| 108 | nvec = 0; |
| 109 | |
| 110 | if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) { |
| 111 | int entry; |
| 112 | |
| 113 | /* |
| 114 | * The code below follows the PCI Express Base Specification 2.0 |
| 115 | * stating in Section 6.1.6 that "PME and Hot-Plug Event |
| 116 | * interrupts (when both are implemented) always share the same |
| 117 | * MSI or MSI-X vector, as indicated by the Interrupt Message |
| 118 | * Number field in the PCI Express Capabilities register", where |
| 119 | * according to Section 7.8.2 of the specification "For MSI-X, |
| 120 | * the value in this field indicates which MSI-X Table entry is |
| 121 | * used to generate the interrupt message." |
| 122 | */ |
| 123 | pcie_capability_read_word(dev, PCI_EXP_FLAGS, ®16); |
| 124 | entry = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9; |
| 125 | if (entry >= nr_entries) |
| 126 | goto Error; |
| 127 | |
| 128 | i = pcie_port_msix_add_entry(msix_entries, entry, nvec); |
| 129 | if (i == nvec) |
| 130 | nvec++; |
| 131 | |
| 132 | idx[PCIE_PORT_SERVICE_PME_SHIFT] = i; |
| 133 | idx[PCIE_PORT_SERVICE_HP_SHIFT] = i; |
| 134 | } |
| 135 | |
| 136 | if (mask & PCIE_PORT_SERVICE_AER) { |
| 137 | int entry; |
| 138 | |
| 139 | /* |
| 140 | * The code below follows Section 7.10.10 of the PCI Express |
| 141 | * Base Specification 2.0 stating that bits 31-27 of the Root |
| 142 | * Error Status Register contain a value indicating which of the |
| 143 | * MSI/MSI-X vectors assigned to the port is going to be used |
| 144 | * for AER, where "For MSI-X, the value in this register |
| 145 | * indicates which MSI-X Table entry is used to generate the |
| 146 | * interrupt message." |
| 147 | */ |
| 148 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
| 149 | pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32); |
| 150 | entry = reg32 >> 27; |
| 151 | if (entry >= nr_entries) |
| 152 | goto Error; |
| 153 | |
| 154 | i = pcie_port_msix_add_entry(msix_entries, entry, nvec); |
| 155 | if (i == nvec) |
| 156 | nvec++; |
| 157 | |
| 158 | idx[PCIE_PORT_SERVICE_AER_SHIFT] = i; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * If nvec is equal to the allocated number of entries, we can just use |
| 163 | * what we have. Otherwise, the port has some extra entries not for the |
| 164 | * services we know and we need to work around that. |
| 165 | */ |
| 166 | if (nvec == nr_entries) { |
| 167 | status = 0; |
| 168 | } else { |
| 169 | /* Drop the temporary MSI-X setup */ |
| 170 | pci_disable_msix(dev); |
| 171 | |
| 172 | /* Now allocate the MSI-X vectors for real */ |
| 173 | status = pci_enable_msix(dev, msix_entries, nvec); |
| 174 | if (status) |
| 175 | goto Exit; |
| 176 | } |
| 177 | |
| 178 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) |
| 179 | vectors[i] = idx[i] >= 0 ? msix_entries[idx[i]].vector : -1; |
| 180 | |
| 181 | Exit: |
| 182 | kfree(msix_entries); |
| 183 | return status; |
| 184 | |
| 185 | Error: |
| 186 | pci_disable_msix(dev); |
| 187 | goto Exit; |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * init_service_irqs - initialize irqs for PCI Express port services |
| 192 | * @dev: PCI Express port to handle |
| 193 | * @irqs: Array of irqs to populate |
| 194 | * @mask: Bitmask of port capabilities returned by get_port_device_capability() |
| 195 | * |
| 196 | * Return value: Interrupt mode associated with the port |
| 197 | */ |
| 198 | static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask) |
| 199 | { |
| 200 | int i, irq = -1; |
| 201 | |
| 202 | /* |
| 203 | * If MSI cannot be used for PCIe PME or hotplug, we have to use |
| 204 | * INTx or other interrupts, e.g. system shared interrupt. |
| 205 | */ |
| 206 | if (((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi()) || |
| 207 | ((mask & PCIE_PORT_SERVICE_HP) && pciehp_no_msi())) { |
| 208 | if (dev->irq) |
| 209 | irq = dev->irq; |
| 210 | goto no_msi; |
| 211 | } |
| 212 | |
| 213 | /* Try to use MSI-X if supported */ |
| 214 | if (!pcie_port_enable_msix(dev, irqs, mask)) |
| 215 | return 0; |
| 216 | |
| 217 | /* |
| 218 | * We're not going to use MSI-X, so try MSI and fall back to INTx. |
| 219 | * If neither MSI/MSI-X nor INTx available, try other interrupt. On |
| 220 | * some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode. |
| 221 | */ |
| 222 | if (!pci_enable_msi(dev) || dev->irq) |
| 223 | irq = dev->irq; |
| 224 | |
| 225 | no_msi: |
| 226 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) |
| 227 | irqs[i] = irq; |
| 228 | irqs[PCIE_PORT_SERVICE_VC_SHIFT] = -1; |
| 229 | |
| 230 | if (irq < 0) |
| 231 | return -ENODEV; |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | static void cleanup_service_irqs(struct pci_dev *dev) |
| 236 | { |
| 237 | if (dev->msix_enabled) |
| 238 | pci_disable_msix(dev); |
| 239 | else if (dev->msi_enabled) |
| 240 | pci_disable_msi(dev); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * get_port_device_capability - discover capabilities of a PCI Express port |
| 245 | * @dev: PCI Express port to examine |
| 246 | * |
| 247 | * The capabilities are read from the port's PCI Express configuration registers |
| 248 | * as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and |
| 249 | * 7.9 - 7.11. |
| 250 | * |
| 251 | * Return value: Bitmask of discovered port capabilities |
| 252 | */ |
| 253 | static int get_port_device_capability(struct pci_dev *dev) |
| 254 | { |
| 255 | int services = 0; |
| 256 | u32 reg32; |
| 257 | int cap_mask = 0; |
| 258 | int err; |
| 259 | |
| 260 | if (pcie_ports_disabled) |
| 261 | return 0; |
| 262 | |
| 263 | err = pcie_port_platform_notify(dev, &cap_mask); |
| 264 | if (!pcie_ports_auto) { |
| 265 | cap_mask = PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP |
| 266 | | PCIE_PORT_SERVICE_VC; |
| 267 | if (pci_aer_available()) |
| 268 | cap_mask |= PCIE_PORT_SERVICE_AER; |
| 269 | } else if (err) { |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | /* Hot-Plug Capable */ |
| 274 | if ((cap_mask & PCIE_PORT_SERVICE_HP) && |
| 275 | pcie_caps_reg(dev) & PCI_EXP_FLAGS_SLOT) { |
| 276 | pcie_capability_read_dword(dev, PCI_EXP_SLTCAP, ®32); |
| 277 | if (reg32 & PCI_EXP_SLTCAP_HPC) { |
| 278 | services |= PCIE_PORT_SERVICE_HP; |
| 279 | /* |
| 280 | * Disable hot-plug interrupts in case they have been |
| 281 | * enabled by the BIOS and the hot-plug service driver |
| 282 | * is not loaded. |
| 283 | */ |
| 284 | pcie_capability_clear_word(dev, PCI_EXP_SLTCTL, |
| 285 | PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE); |
| 286 | } |
| 287 | } |
| 288 | /* AER capable */ |
| 289 | if ((cap_mask & PCIE_PORT_SERVICE_AER) |
| 290 | && pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) { |
| 291 | services |= PCIE_PORT_SERVICE_AER; |
| 292 | /* |
| 293 | * Disable AER on this port in case it's been enabled by the |
| 294 | * BIOS (the AER service driver will enable it when necessary). |
| 295 | */ |
| 296 | pci_disable_pcie_error_reporting(dev); |
| 297 | } |
| 298 | /* VC support */ |
| 299 | if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC)) |
| 300 | services |= PCIE_PORT_SERVICE_VC; |
| 301 | /* Root ports are capable of generating PME too */ |
| 302 | if ((cap_mask & PCIE_PORT_SERVICE_PME) |
| 303 | && pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) { |
| 304 | services |= PCIE_PORT_SERVICE_PME; |
| 305 | /* |
| 306 | * Disable PME interrupt on this port in case it's been enabled |
| 307 | * by the BIOS (the PME service driver will enable it when |
| 308 | * necessary). |
| 309 | */ |
| 310 | pcie_pme_interrupt_enable(dev, false); |
| 311 | } |
| 312 | |
| 313 | return services; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * pcie_device_init - allocate and initialize PCI Express port service device |
| 318 | * @pdev: PCI Express port to associate the service device with |
| 319 | * @service: Type of service to associate with the service device |
| 320 | * @irq: Interrupt vector to associate with the service device |
| 321 | */ |
| 322 | static int pcie_device_init(struct pci_dev *pdev, int service, int irq) |
| 323 | { |
| 324 | int retval; |
| 325 | struct pcie_device *pcie; |
| 326 | struct device *device; |
| 327 | |
| 328 | pcie = kzalloc(sizeof(*pcie), GFP_KERNEL); |
| 329 | if (!pcie) |
| 330 | return -ENOMEM; |
| 331 | pcie->port = pdev; |
| 332 | pcie->irq = irq; |
| 333 | pcie->service = service; |
| 334 | |
| 335 | /* Initialize generic device interface */ |
| 336 | device = &pcie->device; |
| 337 | device->bus = &pcie_port_bus_type; |
| 338 | device->release = release_pcie_device; /* callback to free pcie dev */ |
| 339 | dev_set_name(device, "%s:pcie%02x", |
| 340 | pci_name(pdev), |
| 341 | get_descriptor_id(pci_pcie_type(pdev), service)); |
| 342 | device->parent = &pdev->dev; |
| 343 | device_enable_async_suspend(device); |
| 344 | |
| 345 | retval = device_register(device); |
| 346 | if (retval) |
| 347 | kfree(pcie); |
| 348 | else |
| 349 | get_device(device); |
| 350 | return retval; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * pcie_port_device_register - register PCI Express port |
| 355 | * @dev: PCI Express port to register |
| 356 | * |
| 357 | * Allocate the port extension structure and register services associated with |
| 358 | * the port. |
| 359 | */ |
| 360 | int pcie_port_device_register(struct pci_dev *dev) |
| 361 | { |
| 362 | int status, capabilities, i, nr_service; |
| 363 | int irqs[PCIE_PORT_DEVICE_MAXSERVICES]; |
| 364 | |
| 365 | /* Enable PCI Express port device */ |
| 366 | status = pci_enable_device(dev); |
| 367 | if (status) |
| 368 | return status; |
| 369 | |
| 370 | /* Get and check PCI Express port services */ |
| 371 | capabilities = get_port_device_capability(dev); |
| 372 | if (!capabilities) |
| 373 | return 0; |
| 374 | |
| 375 | pci_set_master(dev); |
| 376 | /* |
| 377 | * Initialize service irqs. Don't use service devices that |
| 378 | * require interrupts if there is no way to generate them. |
| 379 | */ |
| 380 | status = init_service_irqs(dev, irqs, capabilities); |
| 381 | if (status) { |
| 382 | capabilities &= PCIE_PORT_SERVICE_VC; |
| 383 | if (!capabilities) |
| 384 | goto error_disable; |
| 385 | } |
| 386 | |
| 387 | /* Allocate child services if any */ |
| 388 | status = -ENODEV; |
| 389 | nr_service = 0; |
| 390 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) { |
| 391 | int service = 1 << i; |
| 392 | if (!(capabilities & service)) |
| 393 | continue; |
| 394 | if (!pcie_device_init(dev, service, irqs[i])) |
| 395 | nr_service++; |
| 396 | } |
| 397 | if (!nr_service) |
| 398 | goto error_cleanup_irqs; |
| 399 | |
| 400 | return 0; |
| 401 | |
| 402 | error_cleanup_irqs: |
| 403 | cleanup_service_irqs(dev); |
| 404 | error_disable: |
| 405 | pci_disable_device(dev); |
| 406 | return status; |
| 407 | } |
| 408 | |
| 409 | #ifdef CONFIG_PM |
| 410 | static int suspend_iter(struct device *dev, void *data) |
| 411 | { |
| 412 | struct pcie_port_service_driver *service_driver; |
| 413 | |
| 414 | if ((dev->bus == &pcie_port_bus_type) && dev->driver) { |
| 415 | service_driver = to_service_driver(dev->driver); |
| 416 | if (service_driver->suspend) |
| 417 | service_driver->suspend(to_pcie_device(dev)); |
| 418 | } |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * pcie_port_device_suspend - suspend port services associated with a PCIe port |
| 424 | * @dev: PCI Express port to handle |
| 425 | */ |
| 426 | int pcie_port_device_suspend(struct device *dev) |
| 427 | { |
| 428 | return device_for_each_child(dev, NULL, suspend_iter); |
| 429 | } |
| 430 | |
| 431 | static int resume_iter(struct device *dev, void *data) |
| 432 | { |
| 433 | struct pcie_port_service_driver *service_driver; |
| 434 | |
| 435 | if ((dev->bus == &pcie_port_bus_type) && |
| 436 | (dev->driver)) { |
| 437 | service_driver = to_service_driver(dev->driver); |
| 438 | if (service_driver->resume) |
| 439 | service_driver->resume(to_pcie_device(dev)); |
| 440 | } |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * pcie_port_device_suspend - resume port services associated with a PCIe port |
| 446 | * @dev: PCI Express port to handle |
| 447 | */ |
| 448 | int pcie_port_device_resume(struct device *dev) |
| 449 | { |
| 450 | return device_for_each_child(dev, NULL, resume_iter); |
| 451 | } |
| 452 | #endif /* PM */ |
| 453 | |
| 454 | static int remove_iter(struct device *dev, void *data) |
| 455 | { |
| 456 | if (dev->bus == &pcie_port_bus_type) { |
| 457 | put_device(dev); |
| 458 | device_unregister(dev); |
| 459 | } |
| 460 | return 0; |
| 461 | } |
| 462 | |
| 463 | /** |
| 464 | * pcie_port_device_remove - unregister PCI Express port service devices |
| 465 | * @dev: PCI Express port the service devices to unregister are associated with |
| 466 | * |
| 467 | * Remove PCI Express port service devices associated with given port and |
| 468 | * disable MSI-X or MSI for the port. |
| 469 | */ |
| 470 | void pcie_port_device_remove(struct pci_dev *dev) |
| 471 | { |
| 472 | device_for_each_child(&dev->dev, NULL, remove_iter); |
| 473 | cleanup_service_irqs(dev); |
| 474 | pci_disable_device(dev); |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * pcie_port_probe_service - probe driver for given PCI Express port service |
| 479 | * @dev: PCI Express port service device to probe against |
| 480 | * |
| 481 | * If PCI Express port service driver is registered with |
| 482 | * pcie_port_service_register(), this function will be called by the driver core |
| 483 | * whenever match is found between the driver and a port service device. |
| 484 | */ |
| 485 | static int pcie_port_probe_service(struct device *dev) |
| 486 | { |
| 487 | struct pcie_device *pciedev; |
| 488 | struct pcie_port_service_driver *driver; |
| 489 | int status; |
| 490 | |
| 491 | if (!dev || !dev->driver) |
| 492 | return -ENODEV; |
| 493 | |
| 494 | driver = to_service_driver(dev->driver); |
| 495 | if (!driver || !driver->probe) |
| 496 | return -ENODEV; |
| 497 | |
| 498 | pciedev = to_pcie_device(dev); |
| 499 | status = driver->probe(pciedev); |
| 500 | if (!status) { |
| 501 | dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n", |
| 502 | driver->name); |
| 503 | get_device(dev); |
| 504 | } |
| 505 | return status; |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * pcie_port_remove_service - detach driver from given PCI Express port service |
| 510 | * @dev: PCI Express port service device to handle |
| 511 | * |
| 512 | * If PCI Express port service driver is registered with |
| 513 | * pcie_port_service_register(), this function will be called by the driver core |
| 514 | * when device_unregister() is called for the port service device associated |
| 515 | * with the driver. |
| 516 | */ |
| 517 | static int pcie_port_remove_service(struct device *dev) |
| 518 | { |
| 519 | struct pcie_device *pciedev; |
| 520 | struct pcie_port_service_driver *driver; |
| 521 | |
| 522 | if (!dev || !dev->driver) |
| 523 | return 0; |
| 524 | |
| 525 | pciedev = to_pcie_device(dev); |
| 526 | driver = to_service_driver(dev->driver); |
| 527 | if (driver && driver->remove) { |
| 528 | dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n", |
| 529 | driver->name); |
| 530 | driver->remove(pciedev); |
| 531 | put_device(dev); |
| 532 | } |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * pcie_port_shutdown_service - shut down given PCI Express port service |
| 538 | * @dev: PCI Express port service device to handle |
| 539 | * |
| 540 | * If PCI Express port service driver is registered with |
| 541 | * pcie_port_service_register(), this function will be called by the driver core |
| 542 | * when device_shutdown() is called for the port service device associated |
| 543 | * with the driver. |
| 544 | */ |
| 545 | static void pcie_port_shutdown_service(struct device *dev) {} |
| 546 | |
| 547 | /** |
| 548 | * pcie_port_service_register - register PCI Express port service driver |
| 549 | * @new: PCI Express port service driver to register |
| 550 | */ |
| 551 | int pcie_port_service_register(struct pcie_port_service_driver *new) |
| 552 | { |
| 553 | if (pcie_ports_disabled) |
| 554 | return -ENODEV; |
| 555 | |
| 556 | new->driver.name = (char *)new->name; |
| 557 | new->driver.bus = &pcie_port_bus_type; |
| 558 | new->driver.probe = pcie_port_probe_service; |
| 559 | new->driver.remove = pcie_port_remove_service; |
| 560 | new->driver.shutdown = pcie_port_shutdown_service; |
| 561 | |
| 562 | return driver_register(&new->driver); |
| 563 | } |
| 564 | EXPORT_SYMBOL(pcie_port_service_register); |
| 565 | |
| 566 | /** |
| 567 | * pcie_port_service_unregister - unregister PCI Express port service driver |
| 568 | * @drv: PCI Express port service driver to unregister |
| 569 | */ |
| 570 | void pcie_port_service_unregister(struct pcie_port_service_driver *drv) |
| 571 | { |
| 572 | driver_unregister(&drv->driver); |
| 573 | } |
| 574 | EXPORT_SYMBOL(pcie_port_service_unregister); |