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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/pm_runtime.h>
15#include <linux/string.h>
16#include <linux/slab.h>
17#include <linux/aer.h>
18
19#include "../pci.h"
20#include "portdrv.h"
21
22struct portdrv_service_data {
23 struct pcie_port_service_driver *drv;
24 struct device *dev;
25 u32 service;
26};
27
28
29
30
31
32
33
34
35static void release_pcie_device(struct device *dev)
36{
37 kfree(to_pcie_device(dev));
38}
39
40
41
42
43
44
45static int pcie_message_numbers(struct pci_dev *dev, int mask,
46 u32 *pme, u32 *aer, u32 *dpc)
47{
48 u32 nvec = 0, pos;
49 u16 reg16;
50
51
52
53
54
55
56
57
58 if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP |
59 PCIE_PORT_SERVICE_BWNOTIF)) {
60 pcie_capability_read_word(dev, PCI_EXP_FLAGS, ®16);
61 *pme = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9;
62 nvec = *pme + 1;
63 }
64
65#ifdef CONFIG_PCIEAER
66 if (mask & PCIE_PORT_SERVICE_AER) {
67 u32 reg32;
68
69 pos = dev->aer_cap;
70 if (pos) {
71 pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS,
72 ®32);
73 *aer = (reg32 & PCI_ERR_ROOT_AER_IRQ) >> 27;
74 nvec = max(nvec, *aer + 1);
75 }
76 }
77#endif
78
79 if (mask & PCIE_PORT_SERVICE_DPC) {
80 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC);
81 if (pos) {
82 pci_read_config_word(dev, pos + PCI_EXP_DPC_CAP,
83 ®16);
84 *dpc = reg16 & PCI_EXP_DPC_IRQ;
85 nvec = max(nvec, *dpc + 1);
86 }
87 }
88
89 return nvec;
90}
91
92
93
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98
99
100
101static int pcie_port_enable_irq_vec(struct pci_dev *dev, int *irqs, int mask)
102{
103 int nr_entries, nvec, pcie_irq;
104 u32 pme = 0, aer = 0, dpc = 0;
105
106
107 nr_entries = pci_alloc_irq_vectors(dev, 1, PCIE_PORT_MAX_MSI_ENTRIES,
108 PCI_IRQ_MSIX | PCI_IRQ_MSI);
109 if (nr_entries < 0)
110 return nr_entries;
111
112
113 nvec = pcie_message_numbers(dev, mask, &pme, &aer, &dpc);
114 if (nvec > nr_entries) {
115 pci_free_irq_vectors(dev);
116 return -EIO;
117 }
118
119
120
121
122
123
124
125
126
127
128
129
130 if (nvec != nr_entries) {
131 pci_free_irq_vectors(dev);
132
133 nr_entries = pci_alloc_irq_vectors(dev, nvec, nvec,
134 PCI_IRQ_MSIX | PCI_IRQ_MSI);
135 if (nr_entries < 0)
136 return nr_entries;
137 }
138
139
140 if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP |
141 PCIE_PORT_SERVICE_BWNOTIF)) {
142 pcie_irq = pci_irq_vector(dev, pme);
143 irqs[PCIE_PORT_SERVICE_PME_SHIFT] = pcie_irq;
144 irqs[PCIE_PORT_SERVICE_HP_SHIFT] = pcie_irq;
145 irqs[PCIE_PORT_SERVICE_BWNOTIF_SHIFT] = pcie_irq;
146 }
147
148 if (mask & PCIE_PORT_SERVICE_AER)
149 irqs[PCIE_PORT_SERVICE_AER_SHIFT] = pci_irq_vector(dev, aer);
150
151 if (mask & PCIE_PORT_SERVICE_DPC)
152 irqs[PCIE_PORT_SERVICE_DPC_SHIFT] = pci_irq_vector(dev, dpc);
153
154 return 0;
155}
156
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162
163
164
165static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
166{
167 int ret, i;
168
169 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
170 irqs[i] = -1;
171
172
173
174
175
176
177 if ((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi())
178 goto legacy_irq;
179
180
181 if (pcie_port_enable_irq_vec(dev, irqs, mask) == 0)
182 return 0;
183
184legacy_irq:
185
186 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY);
187 if (ret < 0)
188 return -ENODEV;
189
190 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
191 irqs[i] = pci_irq_vector(dev, 0);
192
193 return 0;
194}
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205
206static int get_port_device_capability(struct pci_dev *dev)
207{
208 struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
209 int services = 0;
210
211 if (dev->is_hotplug_bridge &&
212 (pcie_ports_native || host->native_pcie_hotplug)) {
213 services |= PCIE_PORT_SERVICE_HP;
214
215
216
217
218
219 pcie_capability_clear_word(dev, PCI_EXP_SLTCTL,
220 PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE);
221 }
222
223#ifdef CONFIG_PCIEAER
224 if (dev->aer_cap && pci_aer_available() &&
225 (pcie_ports_native || host->native_aer)) {
226 services |= PCIE_PORT_SERVICE_AER;
227
228
229
230
231
232 pci_disable_pcie_error_reporting(dev);
233 }
234#endif
235
236
237 if ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
238 pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) &&
239 (pcie_ports_native || host->native_pme)) {
240 services |= PCIE_PORT_SERVICE_PME;
241
242
243
244
245
246
247 pcie_pme_interrupt_enable(dev, false);
248 }
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253
254 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
255 pci_aer_available() &&
256 (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER)))
257 services |= PCIE_PORT_SERVICE_DPC;
258
259 if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
260 pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) {
261 u32 linkcap;
262
263 pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &linkcap);
264 if (linkcap & PCI_EXP_LNKCAP_LBNC)
265 services |= PCIE_PORT_SERVICE_BWNOTIF;
266 }
267
268 return services;
269}
270
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275
276
277static int pcie_device_init(struct pci_dev *pdev, int service, int irq)
278{
279 int retval;
280 struct pcie_device *pcie;
281 struct device *device;
282
283 pcie = kzalloc(sizeof(*pcie), GFP_KERNEL);
284 if (!pcie)
285 return -ENOMEM;
286 pcie->port = pdev;
287 pcie->irq = irq;
288 pcie->service = service;
289
290
291 device = &pcie->device;
292 device->bus = &pcie_port_bus_type;
293 device->release = release_pcie_device;
294 dev_set_name(device, "%s:pcie%03x",
295 pci_name(pdev),
296 get_descriptor_id(pci_pcie_type(pdev), service));
297 device->parent = &pdev->dev;
298 device_enable_async_suspend(device);
299
300 retval = device_register(device);
301 if (retval) {
302 put_device(device);
303 return retval;
304 }
305
306 pm_runtime_no_callbacks(device);
307
308 return 0;
309}
310
311
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314
315
316
317
318int pcie_port_device_register(struct pci_dev *dev)
319{
320 int status, capabilities, i, nr_service;
321 int irqs[PCIE_PORT_DEVICE_MAXSERVICES];
322
323
324 status = pci_enable_device(dev);
325 if (status)
326 return status;
327
328
329 capabilities = get_port_device_capability(dev);
330 if (!capabilities)
331 return 0;
332
333 pci_set_master(dev);
334
335
336
337
338
339
340
341 status = pcie_init_service_irqs(dev, irqs, capabilities);
342 if (status) {
343 capabilities &= PCIE_PORT_SERVICE_HP;
344 if (!capabilities)
345 goto error_disable;
346 }
347
348
349 status = -ENODEV;
350 nr_service = 0;
351 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
352 int service = 1 << i;
353 if (!(capabilities & service))
354 continue;
355 if (!pcie_device_init(dev, service, irqs[i]))
356 nr_service++;
357 }
358 if (!nr_service)
359 goto error_cleanup_irqs;
360
361 return 0;
362
363error_cleanup_irqs:
364 pci_free_irq_vectors(dev);
365error_disable:
366 pci_disable_device(dev);
367 return status;
368}
369
370#ifdef CONFIG_PM
371typedef int (*pcie_pm_callback_t)(struct pcie_device *);
372
373static int pm_iter(struct device *dev, void *data)
374{
375 struct pcie_port_service_driver *service_driver;
376 size_t offset = *(size_t *)data;
377 pcie_pm_callback_t cb;
378
379 if ((dev->bus == &pcie_port_bus_type) && dev->driver) {
380 service_driver = to_service_driver(dev->driver);
381 cb = *(pcie_pm_callback_t *)((void *)service_driver + offset);
382 if (cb)
383 return cb(to_pcie_device(dev));
384 }
385 return 0;
386}
387
388
389
390
391
392int pcie_port_device_suspend(struct device *dev)
393{
394 size_t off = offsetof(struct pcie_port_service_driver, suspend);
395 return device_for_each_child(dev, &off, pm_iter);
396}
397
398int pcie_port_device_resume_noirq(struct device *dev)
399{
400 size_t off = offsetof(struct pcie_port_service_driver, resume_noirq);
401 return device_for_each_child(dev, &off, pm_iter);
402}
403
404
405
406
407
408int pcie_port_device_resume(struct device *dev)
409{
410 size_t off = offsetof(struct pcie_port_service_driver, resume);
411 return device_for_each_child(dev, &off, pm_iter);
412}
413
414
415
416
417
418int pcie_port_device_runtime_suspend(struct device *dev)
419{
420 size_t off = offsetof(struct pcie_port_service_driver, runtime_suspend);
421 return device_for_each_child(dev, &off, pm_iter);
422}
423
424
425
426
427
428int pcie_port_device_runtime_resume(struct device *dev)
429{
430 size_t off = offsetof(struct pcie_port_service_driver, runtime_resume);
431 return device_for_each_child(dev, &off, pm_iter);
432}
433#endif
434
435static int remove_iter(struct device *dev, void *data)
436{
437 if (dev->bus == &pcie_port_bus_type)
438 device_unregister(dev);
439 return 0;
440}
441
442static int find_service_iter(struct device *device, void *data)
443{
444 struct pcie_port_service_driver *service_driver;
445 struct portdrv_service_data *pdrvs;
446 u32 service;
447
448 pdrvs = (struct portdrv_service_data *) data;
449 service = pdrvs->service;
450
451 if (device->bus == &pcie_port_bus_type && device->driver) {
452 service_driver = to_service_driver(device->driver);
453 if (service_driver->service == service) {
454 pdrvs->drv = service_driver;
455 pdrvs->dev = device;
456 return 1;
457 }
458 }
459
460 return 0;
461}
462
463
464
465
466
467
468
469
470struct device *pcie_port_find_device(struct pci_dev *dev,
471 u32 service)
472{
473 struct device *device;
474 struct portdrv_service_data pdrvs;
475
476 pdrvs.dev = NULL;
477 pdrvs.service = service;
478 device_for_each_child(&dev->dev, &pdrvs, find_service_iter);
479
480 device = pdrvs.dev;
481 return device;
482}
483EXPORT_SYMBOL_GPL(pcie_port_find_device);
484
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486
487
488
489
490
491
492void pcie_port_device_remove(struct pci_dev *dev)
493{
494 device_for_each_child(&dev->dev, NULL, remove_iter);
495 pci_free_irq_vectors(dev);
496 pci_disable_device(dev);
497}
498
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505
506
507static int pcie_port_probe_service(struct device *dev)
508{
509 struct pcie_device *pciedev;
510 struct pcie_port_service_driver *driver;
511 int status;
512
513 if (!dev || !dev->driver)
514 return -ENODEV;
515
516 driver = to_service_driver(dev->driver);
517 if (!driver || !driver->probe)
518 return -ENODEV;
519
520 pciedev = to_pcie_device(dev);
521 status = driver->probe(pciedev);
522 if (status)
523 return status;
524
525 get_device(dev);
526 return 0;
527}
528
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532
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535
536
537
538static int pcie_port_remove_service(struct device *dev)
539{
540 struct pcie_device *pciedev;
541 struct pcie_port_service_driver *driver;
542
543 if (!dev || !dev->driver)
544 return 0;
545
546 pciedev = to_pcie_device(dev);
547 driver = to_service_driver(dev->driver);
548 if (driver && driver->remove) {
549 driver->remove(pciedev);
550 put_device(dev);
551 }
552 return 0;
553}
554
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558
559
560
561
562
563
564static void pcie_port_shutdown_service(struct device *dev) {}
565
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568
569
570int pcie_port_service_register(struct pcie_port_service_driver *new)
571{
572 if (pcie_ports_disabled)
573 return -ENODEV;
574
575 new->driver.name = new->name;
576 new->driver.bus = &pcie_port_bus_type;
577 new->driver.probe = pcie_port_probe_service;
578 new->driver.remove = pcie_port_remove_service;
579 new->driver.shutdown = pcie_port_shutdown_service;
580
581 return driver_register(&new->driver);
582}
583EXPORT_SYMBOL(pcie_port_service_register);
584
585
586
587
588
589void pcie_port_service_unregister(struct pcie_port_service_driver *drv)
590{
591 driver_unregister(&drv->driver);
592}
593EXPORT_SYMBOL(pcie_port_service_unregister);
594