Commit | Line | Data |
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1da177e4 LT |
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> | |
4e57b681 TS |
14 | #include <linux/string.h> |
15 | #include <linux/slab.h> | |
1da177e4 LT |
16 | #include <linux/pcieport_if.h> |
17 | ||
1bf83e55 | 18 | #include "../pci.h" |
1da177e4 LT |
19 | #include "portdrv.h" |
20 | ||
facf6d16 RW |
21 | /** |
22 | * release_pcie_device - free PCI Express port service device structure | |
23 | * @dev: Port service device to release | |
24 | * | |
25 | * Invoked automatically when device is being removed in response to | |
26 | * device_unregister(dev). Release all resources being claimed. | |
1da177e4 LT |
27 | */ |
28 | static void release_pcie_device(struct device *dev) | |
29 | { | |
1da177e4 LT |
30 | kfree(to_pcie_device(dev)); |
31 | } | |
32 | ||
b43d4513 RW |
33 | /** |
34 | * pcie_port_msix_add_entry - add entry to given array of MSI-X entries | |
35 | * @entries: Array of MSI-X entries | |
36 | * @new_entry: Index of the entry to add to the array | |
37 | * @nr_entries: Number of entries aleady in the array | |
38 | * | |
39 | * Return value: Position of the added entry in the array | |
40 | */ | |
41 | static int pcie_port_msix_add_entry( | |
42 | struct msix_entry *entries, int new_entry, int nr_entries) | |
43 | { | |
44 | int j; | |
45 | ||
46 | for (j = 0; j < nr_entries; j++) | |
47 | if (entries[j].entry == new_entry) | |
48 | return j; | |
49 | ||
50 | entries[j].entry = new_entry; | |
51 | return j; | |
52 | } | |
53 | ||
54 | /** | |
55 | * pcie_port_enable_msix - try to set up MSI-X as interrupt mode for given port | |
56 | * @dev: PCI Express port to handle | |
57 | * @vectors: Array of interrupt vectors to populate | |
58 | * @mask: Bitmask of port capabilities returned by get_port_device_capability() | |
59 | * | |
60 | * Return value: 0 on success, error code on failure | |
61 | */ | |
62 | static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask) | |
63 | { | |
64 | struct msix_entry *msix_entries; | |
65 | int idx[PCIE_PORT_DEVICE_MAXSERVICES]; | |
66 | int nr_entries, status, pos, i, nvec; | |
67 | u16 reg16; | |
68 | u32 reg32; | |
69 | ||
70 | nr_entries = pci_msix_table_size(dev); | |
71 | if (!nr_entries) | |
72 | return -EINVAL; | |
73 | if (nr_entries > PCIE_PORT_MAX_MSIX_ENTRIES) | |
74 | nr_entries = PCIE_PORT_MAX_MSIX_ENTRIES; | |
75 | ||
76 | msix_entries = kzalloc(sizeof(*msix_entries) * nr_entries, GFP_KERNEL); | |
77 | if (!msix_entries) | |
78 | return -ENOMEM; | |
79 | ||
80 | /* | |
81 | * Allocate as many entries as the port wants, so that we can check | |
82 | * which of them will be useful. Moreover, if nr_entries is correctly | |
83 | * equal to the number of entries this port actually uses, we'll happily | |
84 | * go through without any tricks. | |
85 | */ | |
86 | for (i = 0; i < nr_entries; i++) | |
87 | msix_entries[i].entry = i; | |
88 | ||
89 | status = pci_enable_msix(dev, msix_entries, nr_entries); | |
90 | if (status) | |
91 | goto Exit; | |
92 | ||
93 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) | |
94 | idx[i] = -1; | |
95 | status = -EIO; | |
96 | nvec = 0; | |
97 | ||
98 | if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) { | |
99 | int entry; | |
100 | ||
101 | /* | |
102 | * The code below follows the PCI Express Base Specification 2.0 | |
103 | * stating in Section 6.1.6 that "PME and Hot-Plug Event | |
104 | * interrupts (when both are implemented) always share the same | |
105 | * MSI or MSI-X vector, as indicated by the Interrupt Message | |
106 | * Number field in the PCI Express Capabilities register", where | |
107 | * according to Section 7.8.2 of the specification "For MSI-X, | |
108 | * the value in this field indicates which MSI-X Table entry is | |
109 | * used to generate the interrupt message." | |
110 | */ | |
111 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
112 | pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16); | |
113 | entry = (reg16 >> 9) & PCIE_PORT_MSI_VECTOR_MASK; | |
114 | if (entry >= nr_entries) | |
115 | goto Error; | |
116 | ||
117 | i = pcie_port_msix_add_entry(msix_entries, entry, nvec); | |
118 | if (i == nvec) | |
119 | nvec++; | |
120 | ||
121 | idx[PCIE_PORT_SERVICE_PME_SHIFT] = i; | |
122 | idx[PCIE_PORT_SERVICE_HP_SHIFT] = i; | |
123 | } | |
124 | ||
125 | if (mask & PCIE_PORT_SERVICE_AER) { | |
126 | int entry; | |
127 | ||
128 | /* | |
129 | * The code below follows Section 7.10.10 of the PCI Express | |
130 | * Base Specification 2.0 stating that bits 31-27 of the Root | |
131 | * Error Status Register contain a value indicating which of the | |
132 | * MSI/MSI-X vectors assigned to the port is going to be used | |
133 | * for AER, where "For MSI-X, the value in this register | |
134 | * indicates which MSI-X Table entry is used to generate the | |
135 | * interrupt message." | |
136 | */ | |
137 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); | |
138 | pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32); | |
139 | entry = reg32 >> 27; | |
140 | if (entry >= nr_entries) | |
141 | goto Error; | |
142 | ||
143 | i = pcie_port_msix_add_entry(msix_entries, entry, nvec); | |
144 | if (i == nvec) | |
145 | nvec++; | |
146 | ||
147 | idx[PCIE_PORT_SERVICE_AER_SHIFT] = i; | |
148 | } | |
149 | ||
150 | /* | |
151 | * If nvec is equal to the allocated number of entries, we can just use | |
152 | * what we have. Otherwise, the port has some extra entries not for the | |
153 | * services we know and we need to work around that. | |
154 | */ | |
155 | if (nvec == nr_entries) { | |
156 | status = 0; | |
157 | } else { | |
158 | /* Drop the temporary MSI-X setup */ | |
159 | pci_disable_msix(dev); | |
160 | ||
161 | /* Now allocate the MSI-X vectors for real */ | |
162 | status = pci_enable_msix(dev, msix_entries, nvec); | |
163 | if (status) | |
164 | goto Exit; | |
165 | } | |
166 | ||
167 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) | |
168 | vectors[i] = idx[i] >= 0 ? msix_entries[idx[i]].vector : -1; | |
169 | ||
170 | Exit: | |
171 | kfree(msix_entries); | |
172 | return status; | |
173 | ||
174 | Error: | |
175 | pci_disable_msix(dev); | |
176 | goto Exit; | |
177 | } | |
178 | ||
facf6d16 RW |
179 | /** |
180 | * assign_interrupt_mode - choose interrupt mode for PCI Express port services | |
181 | * (INTx, MSI-X, MSI) and set up vectors | |
182 | * @dev: PCI Express port to handle | |
183 | * @vectors: Array of interrupt vectors to populate | |
184 | * @mask: Bitmask of port capabilities returned by get_port_device_capability() | |
185 | * | |
186 | * Return value: Interrupt mode associated with the port | |
187 | */ | |
1da177e4 LT |
188 | static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask) |
189 | { | |
1bf83e55 | 190 | struct pcie_port_data *port_data = pci_get_drvdata(dev); |
b43d4513 RW |
191 | int irq, interrupt_mode = PCIE_PORT_NO_IRQ; |
192 | int i; | |
90e9cd50 | 193 | |
1da177e4 | 194 | /* Check MSI quirk */ |
1bf83e55 | 195 | if (port_data->port_type == PCIE_RC_PORT && pcie_mch_quirk) |
b43d4513 RW |
196 | goto Fallback; |
197 | ||
198 | /* Try to use MSI-X if supported */ | |
199 | if (!pcie_port_enable_msix(dev, vectors, mask)) | |
200 | return PCIE_PORT_MSIX_MODE; | |
201 | ||
202 | /* We're not going to use MSI-X, so try MSI and fall back to INTx */ | |
203 | if (!pci_enable_msi(dev)) | |
204 | interrupt_mode = PCIE_PORT_MSI_MODE; | |
205 | ||
206 | Fallback: | |
207 | if (interrupt_mode == PCIE_PORT_NO_IRQ && dev->pin) | |
208 | interrupt_mode = PCIE_PORT_INTx_MODE; | |
209 | ||
210 | irq = interrupt_mode != PCIE_PORT_NO_IRQ ? dev->irq : -1; | |
211 | for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) | |
212 | vectors[i] = irq; | |
213 | ||
214 | vectors[PCIE_PORT_SERVICE_VC_SHIFT] = -1; | |
1da177e4 | 215 | |
1da177e4 LT |
216 | return interrupt_mode; |
217 | } | |
218 | ||
facf6d16 RW |
219 | /** |
220 | * get_port_device_capability - discover capabilities of a PCI Express port | |
221 | * @dev: PCI Express port to examine | |
222 | * | |
223 | * The capabilities are read from the port's PCI Express configuration registers | |
224 | * as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and | |
225 | * 7.9 - 7.11. | |
226 | * | |
227 | * Return value: Bitmask of discovered port capabilities | |
228 | */ | |
1da177e4 LT |
229 | static int get_port_device_capability(struct pci_dev *dev) |
230 | { | |
231 | int services = 0, pos; | |
232 | u16 reg16; | |
233 | u32 reg32; | |
234 | ||
235 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
236 | pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16); | |
237 | /* Hot-Plug Capable */ | |
238 | if (reg16 & PORT_TO_SLOT_MASK) { | |
239 | pci_read_config_dword(dev, | |
240 | pos + PCIE_SLOT_CAPABILITIES_REG, ®32); | |
241 | if (reg32 & SLOT_HP_CAPABLE_MASK) | |
242 | services |= PCIE_PORT_SERVICE_HP; | |
1bf83e55 RW |
243 | } |
244 | /* AER capable */ | |
0927678f JB |
245 | if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) |
246 | services |= PCIE_PORT_SERVICE_AER; | |
1bf83e55 | 247 | /* VC support */ |
0927678f JB |
248 | if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC)) |
249 | services |= PCIE_PORT_SERVICE_VC; | |
1da177e4 LT |
250 | |
251 | return services; | |
252 | } | |
253 | ||
facf6d16 RW |
254 | /** |
255 | * pcie_device_init - initialize PCI Express port service device | |
256 | * @dev: Port service device to initialize | |
257 | * @parent: PCI Express port to associate the service device with | |
258 | * @port_type: Type of the port | |
259 | * @service_type: Type of service to associate with the service device | |
260 | * @irq: Interrupt vector to associate with the service device | |
facf6d16 | 261 | */ |
1da177e4 | 262 | static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev, |
1bf83e55 | 263 | int service_type, int irq) |
1da177e4 | 264 | { |
1bf83e55 | 265 | struct pcie_port_data *port_data = pci_get_drvdata(parent); |
1da177e4 | 266 | struct device *device; |
1bf83e55 | 267 | int port_type = port_data->port_type; |
1da177e4 LT |
268 | |
269 | dev->port = parent; | |
1da177e4 | 270 | dev->irq = irq; |
22106368 | 271 | dev->service = service_type; |
1da177e4 LT |
272 | |
273 | /* Initialize generic device interface */ | |
274 | device = &dev->device; | |
275 | memset(device, 0, sizeof(struct device)); | |
1da177e4 LT |
276 | device->bus = &pcie_port_bus_type; |
277 | device->driver = NULL; | |
8952f593 | 278 | dev_set_drvdata(device, NULL); |
1da177e4 | 279 | device->release = release_pcie_device; /* callback to free pcie dev */ |
1a927133 | 280 | dev_set_name(device, "%s:pcie%02x", |
8c9ad508 | 281 | pci_name(parent), get_descriptor_id(port_type, service_type)); |
1da177e4 LT |
282 | device->parent = &parent->dev; |
283 | } | |
284 | ||
facf6d16 RW |
285 | /** |
286 | * alloc_pcie_device - allocate PCI Express port service device structure | |
287 | * @parent: PCI Express port to associate the service device with | |
288 | * @port_type: Type of the port | |
289 | * @service_type: Type of service to associate with the service device | |
290 | * @irq: Interrupt vector to associate with the service device | |
facf6d16 | 291 | */ |
d0e2b4a0 | 292 | static struct pcie_device* alloc_pcie_device(struct pci_dev *parent, |
1bf83e55 | 293 | int service_type, int irq) |
1da177e4 LT |
294 | { |
295 | struct pcie_device *device; | |
296 | ||
f5afe806 | 297 | device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL); |
1da177e4 LT |
298 | if (!device) |
299 | return NULL; | |
300 | ||
1bf83e55 | 301 | pcie_device_init(parent, device, service_type, irq); |
1da177e4 LT |
302 | return device; |
303 | } | |
304 | ||
facf6d16 RW |
305 | /** |
306 | * pcie_port_device_probe - check if device is a PCI Express port | |
307 | * @dev: Device to check | |
308 | */ | |
1da177e4 LT |
309 | int pcie_port_device_probe(struct pci_dev *dev) |
310 | { | |
311 | int pos, type; | |
312 | u16 reg; | |
313 | ||
314 | if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP))) | |
315 | return -ENODEV; | |
316 | ||
317 | pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®); | |
318 | type = (reg >> 4) & PORT_TYPE_MASK; | |
319 | if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT || | |
d0e2b4a0 | 320 | type == PCIE_SW_DOWNSTREAM_PORT ) |
1da177e4 | 321 | return 0; |
d0e2b4a0 | 322 | |
1da177e4 LT |
323 | return -ENODEV; |
324 | } | |
325 | ||
facf6d16 RW |
326 | /** |
327 | * pcie_port_device_register - register PCI Express port | |
328 | * @dev: PCI Express port to register | |
329 | * | |
330 | * Allocate the port extension structure and register services associated with | |
331 | * the port. | |
332 | */ | |
1da177e4 LT |
333 | int pcie_port_device_register(struct pci_dev *dev) |
334 | { | |
1bf83e55 | 335 | struct pcie_port_data *port_data; |
f118c0c3 | 336 | int status, capabilities, irq_mode, i, nr_serv; |
1da177e4 LT |
337 | int vectors[PCIE_PORT_DEVICE_MAXSERVICES]; |
338 | u16 reg16; | |
339 | ||
1bf83e55 RW |
340 | port_data = kzalloc(sizeof(*port_data), GFP_KERNEL); |
341 | if (!port_data) | |
5823d100 | 342 | return -ENOMEM; |
1bf83e55 | 343 | pci_set_drvdata(dev, port_data); |
5823d100 | 344 | |
1da177e4 | 345 | /* Get port type */ |
d0e2b4a0 | 346 | pci_read_config_word(dev, |
347 | pci_find_capability(dev, PCI_CAP_ID_EXP) + | |
1da177e4 | 348 | PCIE_CAPABILITIES_REG, ®16); |
1bf83e55 | 349 | port_data->port_type = (reg16 >> 4) & PORT_TYPE_MASK; |
1da177e4 | 350 | |
1da177e4 | 351 | capabilities = get_port_device_capability(dev); |
1bf83e55 RW |
352 | /* Root ports are capable of generating PME too */ |
353 | if (port_data->port_type == PCIE_RC_PORT) | |
354 | capabilities |= PCIE_PORT_SERVICE_PME; | |
355 | ||
1da177e4 | 356 | irq_mode = assign_interrupt_mode(dev, vectors, capabilities); |
f118c0c3 RW |
357 | if (irq_mode == PCIE_PORT_NO_IRQ) { |
358 | /* | |
359 | * Don't use service devices that require interrupts if there is | |
360 | * no way to generate them. | |
361 | */ | |
362 | if (!(capabilities & PCIE_PORT_SERVICE_VC)) { | |
363 | status = -ENODEV; | |
364 | goto Error; | |
365 | } | |
366 | capabilities = PCIE_PORT_SERVICE_VC; | |
367 | } | |
1bf83e55 | 368 | port_data->port_irq_mode = irq_mode; |
1da177e4 | 369 | |
f118c0c3 RW |
370 | status = pci_enable_device(dev); |
371 | if (status) | |
372 | goto Error; | |
373 | pci_set_master(dev); | |
374 | ||
1da177e4 | 375 | /* Allocate child services if any */ |
f118c0c3 | 376 | for (i = 0, nr_serv = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) { |
1da177e4 | 377 | struct pcie_device *child; |
90e9cd50 | 378 | int service = 1 << i; |
1da177e4 | 379 | |
90e9cd50 RW |
380 | if (!(capabilities & service)) |
381 | continue; | |
382 | ||
90e9cd50 RW |
383 | child = alloc_pcie_device(dev, service, vectors[i]); |
384 | if (!child) | |
385 | continue; | |
386 | ||
387 | status = device_register(&child->device); | |
388 | if (status) { | |
389 | kfree(child); | |
390 | continue; | |
1da177e4 | 391 | } |
90e9cd50 RW |
392 | |
393 | get_device(&child->device); | |
f118c0c3 RW |
394 | nr_serv++; |
395 | } | |
396 | if (!nr_serv) { | |
397 | pci_disable_device(dev); | |
398 | status = -ENODEV; | |
399 | goto Error; | |
1da177e4 | 400 | } |
90e9cd50 | 401 | |
1da177e4 | 402 | return 0; |
f118c0c3 RW |
403 | |
404 | Error: | |
405 | kfree(port_data); | |
406 | return status; | |
1da177e4 LT |
407 | } |
408 | ||
409 | #ifdef CONFIG_PM | |
d0e2b4a0 | 410 | static int suspend_iter(struct device *dev, void *data) |
1da177e4 | 411 | { |
1da177e4 | 412 | struct pcie_port_service_driver *service_driver; |
d0e2b4a0 | 413 | |
414 | if ((dev->bus == &pcie_port_bus_type) && | |
415 | (dev->driver)) { | |
416 | service_driver = to_service_driver(dev->driver); | |
417 | if (service_driver->suspend) | |
3a3c244c | 418 | service_driver->suspend(to_pcie_device(dev)); |
d0e2b4a0 | 419 | } |
420 | return 0; | |
421 | } | |
1da177e4 | 422 | |
facf6d16 RW |
423 | /** |
424 | * pcie_port_device_suspend - suspend port services associated with a PCIe port | |
425 | * @dev: PCI Express port to handle | |
facf6d16 | 426 | */ |
3a3c244c | 427 | int pcie_port_device_suspend(struct device *dev) |
d0e2b4a0 | 428 | { |
3a3c244c | 429 | return device_for_each_child(dev, NULL, suspend_iter); |
1da177e4 LT |
430 | } |
431 | ||
d0e2b4a0 | 432 | static int resume_iter(struct device *dev, void *data) |
433 | { | |
1da177e4 LT |
434 | struct pcie_port_service_driver *service_driver; |
435 | ||
d0e2b4a0 | 436 | if ((dev->bus == &pcie_port_bus_type) && |
437 | (dev->driver)) { | |
438 | service_driver = to_service_driver(dev->driver); | |
439 | if (service_driver->resume) | |
440 | service_driver->resume(to_pcie_device(dev)); | |
1da177e4 | 441 | } |
d0e2b4a0 | 442 | return 0; |
443 | } | |
1da177e4 | 444 | |
facf6d16 RW |
445 | /** |
446 | * pcie_port_device_suspend - resume port services associated with a PCIe port | |
447 | * @dev: PCI Express port to handle | |
448 | */ | |
3a3c244c | 449 | int pcie_port_device_resume(struct device *dev) |
d0e2b4a0 | 450 | { |
3a3c244c | 451 | return device_for_each_child(dev, NULL, resume_iter); |
1da177e4 | 452 | } |
3a3c244c | 453 | #endif /* PM */ |
1da177e4 | 454 | |
d0e2b4a0 | 455 | static int remove_iter(struct device *dev, void *data) |
1da177e4 | 456 | { |
d0e2b4a0 | 457 | if (dev->bus == &pcie_port_bus_type) { |
ae40582e EB |
458 | put_device(dev); |
459 | device_unregister(dev); | |
1da177e4 | 460 | } |
d0e2b4a0 | 461 | return 0; |
462 | } | |
463 | ||
facf6d16 RW |
464 | /** |
465 | * pcie_port_device_remove - unregister PCI Express port service devices | |
466 | * @dev: PCI Express port the service devices to unregister are associated with | |
467 | * | |
468 | * Remove PCI Express port service devices associated with given port and | |
469 | * disable MSI-X or MSI for the port. | |
470 | */ | |
d0e2b4a0 | 471 | void pcie_port_device_remove(struct pci_dev *dev) |
472 | { | |
1bf83e55 | 473 | struct pcie_port_data *port_data = pci_get_drvdata(dev); |
d0e2b4a0 | 474 | |
ae40582e | 475 | device_for_each_child(&dev->dev, NULL, remove_iter); |
745be2e7 | 476 | pci_disable_device(dev); |
1bf83e55 RW |
477 | |
478 | switch (port_data->port_irq_mode) { | |
479 | case PCIE_PORT_MSIX_MODE: | |
1da177e4 | 480 | pci_disable_msix(dev); |
1bf83e55 RW |
481 | break; |
482 | case PCIE_PORT_MSI_MODE: | |
1da177e4 | 483 | pci_disable_msi(dev); |
1bf83e55 RW |
484 | break; |
485 | } | |
486 | ||
487 | kfree(port_data); | |
1da177e4 LT |
488 | } |
489 | ||
d9347371 RW |
490 | /** |
491 | * pcie_port_probe_service - probe driver for given PCI Express port service | |
492 | * @dev: PCI Express port service device to probe against | |
493 | * | |
494 | * If PCI Express port service driver is registered with | |
495 | * pcie_port_service_register(), this function will be called by the driver core | |
496 | * whenever match is found between the driver and a port service device. | |
497 | */ | |
fa6c9937 | 498 | static int pcie_port_probe_service(struct device *dev) |
1da177e4 | 499 | { |
fa6c9937 RW |
500 | struct pcie_device *pciedev; |
501 | struct pcie_port_service_driver *driver; | |
502 | int status; | |
503 | ||
504 | if (!dev || !dev->driver) | |
505 | return -ENODEV; | |
506 | ||
507 | driver = to_service_driver(dev->driver); | |
508 | if (!driver || !driver->probe) | |
509 | return -ENODEV; | |
510 | ||
511 | pciedev = to_pcie_device(dev); | |
0516c8bc | 512 | status = driver->probe(pciedev); |
fa6c9937 RW |
513 | if (!status) { |
514 | dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n", | |
515 | driver->name); | |
516 | get_device(dev); | |
517 | } | |
518 | return status; | |
1da177e4 LT |
519 | } |
520 | ||
d9347371 RW |
521 | /** |
522 | * pcie_port_remove_service - detach driver from given PCI Express port service | |
523 | * @dev: PCI Express port service device to handle | |
524 | * | |
525 | * If PCI Express port service driver is registered with | |
526 | * pcie_port_service_register(), this function will be called by the driver core | |
527 | * when device_unregister() is called for the port service device associated | |
528 | * with the driver. | |
529 | */ | |
fa6c9937 | 530 | static int pcie_port_remove_service(struct device *dev) |
1da177e4 | 531 | { |
fa6c9937 RW |
532 | struct pcie_device *pciedev; |
533 | struct pcie_port_service_driver *driver; | |
534 | ||
535 | if (!dev || !dev->driver) | |
536 | return 0; | |
537 | ||
538 | pciedev = to_pcie_device(dev); | |
539 | driver = to_service_driver(dev->driver); | |
540 | if (driver && driver->remove) { | |
541 | dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n", | |
542 | driver->name); | |
543 | driver->remove(pciedev); | |
544 | put_device(dev); | |
545 | } | |
546 | return 0; | |
1da177e4 LT |
547 | } |
548 | ||
d9347371 RW |
549 | /** |
550 | * pcie_port_shutdown_service - shut down given PCI Express port service | |
551 | * @dev: PCI Express port service device to handle | |
552 | * | |
553 | * If PCI Express port service driver is registered with | |
554 | * pcie_port_service_register(), this function will be called by the driver core | |
555 | * when device_shutdown() is called for the port service device associated | |
556 | * with the driver. | |
557 | */ | |
fa6c9937 RW |
558 | static void pcie_port_shutdown_service(struct device *dev) {} |
559 | ||
d9347371 RW |
560 | /** |
561 | * pcie_port_service_register - register PCI Express port service driver | |
562 | * @new: PCI Express port service driver to register | |
563 | */ | |
1da177e4 LT |
564 | int pcie_port_service_register(struct pcie_port_service_driver *new) |
565 | { | |
566 | new->driver.name = (char *)new->name; | |
567 | new->driver.bus = &pcie_port_bus_type; | |
568 | new->driver.probe = pcie_port_probe_service; | |
569 | new->driver.remove = pcie_port_remove_service; | |
570 | new->driver.shutdown = pcie_port_shutdown_service; | |
1da177e4 LT |
571 | |
572 | return driver_register(&new->driver); | |
d0e2b4a0 | 573 | } |
1da177e4 | 574 | |
d9347371 RW |
575 | /** |
576 | * pcie_port_service_unregister - unregister PCI Express port service driver | |
577 | * @drv: PCI Express port service driver to unregister | |
578 | */ | |
fa6c9937 | 579 | void pcie_port_service_unregister(struct pcie_port_service_driver *drv) |
1da177e4 | 580 | { |
fa6c9937 | 581 | driver_unregister(&drv->driver); |
1da177e4 LT |
582 | } |
583 | ||
584 | EXPORT_SYMBOL(pcie_port_service_register); | |
585 | EXPORT_SYMBOL(pcie_port_service_unregister); |