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Merge remote-tracking branch 'asoc/topic/jack' into asoc-next
[deliverable/linux.git] / drivers / xen / xen-pciback / pci_stub.c
1 /*
2 * PCI Stub Driver - Grabs devices in backend to be exported later
3 *
4 * Ryan Wilson <hap9@epoch.ncsc.mil>
5 * Chris Bookholt <hap10@epoch.ncsc.mil>
6 */
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/rwsem.h>
10 #include <linux/list.h>
11 #include <linux/spinlock.h>
12 #include <linux/kref.h>
13 #include <linux/pci.h>
14 #include <linux/wait.h>
15 #include <linux/sched.h>
16 #include <linux/atomic.h>
17 #include <xen/events.h>
18 #include <asm/xen/pci.h>
19 #include <asm/xen/hypervisor.h>
20 #include "pciback.h"
21 #include "conf_space.h"
22 #include "conf_space_quirks.h"
23
24 static char *pci_devs_to_hide;
25 wait_queue_head_t xen_pcibk_aer_wait_queue;
26 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
27 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed
28 */
29 static DECLARE_RWSEM(pcistub_sem);
30 module_param_named(hide, pci_devs_to_hide, charp, 0444);
31
32 struct pcistub_device_id {
33 struct list_head slot_list;
34 int domain;
35 unsigned char bus;
36 unsigned int devfn;
37 };
38 static LIST_HEAD(pcistub_device_ids);
39 static DEFINE_SPINLOCK(device_ids_lock);
40
41 struct pcistub_device {
42 struct kref kref;
43 struct list_head dev_list;
44 spinlock_t lock;
45
46 struct pci_dev *dev;
47 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
48 };
49
50 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
51 * flag must be locked with pcistub_devices_lock
52 */
53 static DEFINE_SPINLOCK(pcistub_devices_lock);
54 static LIST_HEAD(pcistub_devices);
55
56 /* wait for device_initcall before initializing our devices
57 * (see pcistub_init_devices_late)
58 */
59 static int initialize_devices;
60 static LIST_HEAD(seized_devices);
61
62 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
63 {
64 struct pcistub_device *psdev;
65
66 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
67
68 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
69 if (!psdev)
70 return NULL;
71
72 psdev->dev = pci_dev_get(dev);
73 if (!psdev->dev) {
74 kfree(psdev);
75 return NULL;
76 }
77
78 kref_init(&psdev->kref);
79 spin_lock_init(&psdev->lock);
80
81 return psdev;
82 }
83
84 /* Don't call this directly as it's called by pcistub_device_put */
85 static void pcistub_device_release(struct kref *kref)
86 {
87 struct pcistub_device *psdev;
88 struct xen_pcibk_dev_data *dev_data;
89
90 psdev = container_of(kref, struct pcistub_device, kref);
91 dev_data = pci_get_drvdata(psdev->dev);
92
93 dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
94
95 xen_unregister_device_domain_owner(psdev->dev);
96
97 /* Call the reset function which does not take lock as this
98 * is called from "unbind" which takes a device_lock mutex.
99 */
100 __pci_reset_function_locked(psdev->dev);
101 if (pci_load_and_free_saved_state(psdev->dev,
102 &dev_data->pci_saved_state)) {
103 dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n");
104 } else
105 pci_restore_state(psdev->dev);
106
107 /* Disable the device */
108 xen_pcibk_reset_device(psdev->dev);
109
110 kfree(dev_data);
111 pci_set_drvdata(psdev->dev, NULL);
112
113 /* Clean-up the device */
114 xen_pcibk_config_free_dyn_fields(psdev->dev);
115 xen_pcibk_config_free_dev(psdev->dev);
116
117 psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
118 pci_dev_put(psdev->dev);
119
120 kfree(psdev);
121 }
122
123 static inline void pcistub_device_get(struct pcistub_device *psdev)
124 {
125 kref_get(&psdev->kref);
126 }
127
128 static inline void pcistub_device_put(struct pcistub_device *psdev)
129 {
130 kref_put(&psdev->kref, pcistub_device_release);
131 }
132
133 static struct pcistub_device *pcistub_device_find(int domain, int bus,
134 int slot, int func)
135 {
136 struct pcistub_device *psdev = NULL;
137 unsigned long flags;
138
139 spin_lock_irqsave(&pcistub_devices_lock, flags);
140
141 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
142 if (psdev->dev != NULL
143 && domain == pci_domain_nr(psdev->dev->bus)
144 && bus == psdev->dev->bus->number
145 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
146 pcistub_device_get(psdev);
147 goto out;
148 }
149 }
150
151 /* didn't find it */
152 psdev = NULL;
153
154 out:
155 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
156 return psdev;
157 }
158
159 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
160 struct pcistub_device *psdev)
161 {
162 struct pci_dev *pci_dev = NULL;
163 unsigned long flags;
164
165 pcistub_device_get(psdev);
166
167 spin_lock_irqsave(&psdev->lock, flags);
168 if (!psdev->pdev) {
169 psdev->pdev = pdev;
170 pci_dev = psdev->dev;
171 }
172 spin_unlock_irqrestore(&psdev->lock, flags);
173
174 if (!pci_dev)
175 pcistub_device_put(psdev);
176
177 return pci_dev;
178 }
179
180 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
181 int domain, int bus,
182 int slot, int func)
183 {
184 struct pcistub_device *psdev;
185 struct pci_dev *found_dev = NULL;
186 unsigned long flags;
187
188 spin_lock_irqsave(&pcistub_devices_lock, flags);
189
190 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
191 if (psdev->dev != NULL
192 && domain == pci_domain_nr(psdev->dev->bus)
193 && bus == psdev->dev->bus->number
194 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
195 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
196 break;
197 }
198 }
199
200 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
201 return found_dev;
202 }
203
204 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
205 struct pci_dev *dev)
206 {
207 struct pcistub_device *psdev;
208 struct pci_dev *found_dev = NULL;
209 unsigned long flags;
210
211 spin_lock_irqsave(&pcistub_devices_lock, flags);
212
213 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
214 if (psdev->dev == dev) {
215 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
216 break;
217 }
218 }
219
220 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
221 return found_dev;
222 }
223
224 void pcistub_put_pci_dev(struct pci_dev *dev)
225 {
226 struct pcistub_device *psdev, *found_psdev = NULL;
227 unsigned long flags;
228
229 spin_lock_irqsave(&pcistub_devices_lock, flags);
230
231 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
232 if (psdev->dev == dev) {
233 found_psdev = psdev;
234 break;
235 }
236 }
237
238 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
239 if (WARN_ON(!found_psdev))
240 return;
241
242 /*hold this lock for avoiding breaking link between
243 * pcistub and xen_pcibk when AER is in processing
244 */
245 down_write(&pcistub_sem);
246 /* Cleanup our device
247 * (so it's ready for the next domain)
248 */
249
250 /* This is OK - we are running from workqueue context
251 * and want to inhibit the user from fiddling with 'reset'
252 */
253 pci_reset_function(dev);
254 pci_restore_state(psdev->dev);
255
256 /* This disables the device. */
257 xen_pcibk_reset_device(found_psdev->dev);
258
259 /* And cleanup up our emulated fields. */
260 xen_pcibk_config_free_dyn_fields(found_psdev->dev);
261 xen_pcibk_config_reset_dev(found_psdev->dev);
262
263 xen_unregister_device_domain_owner(found_psdev->dev);
264
265 spin_lock_irqsave(&found_psdev->lock, flags);
266 found_psdev->pdev = NULL;
267 spin_unlock_irqrestore(&found_psdev->lock, flags);
268
269 pcistub_device_put(found_psdev);
270 up_write(&pcistub_sem);
271 }
272
273 static int __devinit pcistub_match_one(struct pci_dev *dev,
274 struct pcistub_device_id *pdev_id)
275 {
276 /* Match the specified device by domain, bus, slot, func and also if
277 * any of the device's parent bridges match.
278 */
279 for (; dev != NULL; dev = dev->bus->self) {
280 if (pci_domain_nr(dev->bus) == pdev_id->domain
281 && dev->bus->number == pdev_id->bus
282 && dev->devfn == pdev_id->devfn)
283 return 1;
284
285 /* Sometimes topmost bridge links to itself. */
286 if (dev == dev->bus->self)
287 break;
288 }
289
290 return 0;
291 }
292
293 static int __devinit pcistub_match(struct pci_dev *dev)
294 {
295 struct pcistub_device_id *pdev_id;
296 unsigned long flags;
297 int found = 0;
298
299 spin_lock_irqsave(&device_ids_lock, flags);
300 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
301 if (pcistub_match_one(dev, pdev_id)) {
302 found = 1;
303 break;
304 }
305 }
306 spin_unlock_irqrestore(&device_ids_lock, flags);
307
308 return found;
309 }
310
311 static int __devinit pcistub_init_device(struct pci_dev *dev)
312 {
313 struct xen_pcibk_dev_data *dev_data;
314 int err = 0;
315
316 dev_dbg(&dev->dev, "initializing...\n");
317
318 /* The PCI backend is not intended to be a module (or to work with
319 * removable PCI devices (yet). If it were, xen_pcibk_config_free()
320 * would need to be called somewhere to free the memory allocated
321 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
322 */
323 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
324 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
325 if (!dev_data) {
326 err = -ENOMEM;
327 goto out;
328 }
329 pci_set_drvdata(dev, dev_data);
330
331 /*
332 * Setup name for fake IRQ handler. It will only be enabled
333 * once the device is turned on by the guest.
334 */
335 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
336
337 dev_dbg(&dev->dev, "initializing config\n");
338
339 init_waitqueue_head(&xen_pcibk_aer_wait_queue);
340 err = xen_pcibk_config_init_dev(dev);
341 if (err)
342 goto out;
343
344 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
345 * must do this here because pcibios_enable_device may specify
346 * the pci device's true irq (and possibly its other resources)
347 * if they differ from what's in the configuration space.
348 * This makes the assumption that the device's resources won't
349 * change after this point (otherwise this code may break!)
350 */
351 dev_dbg(&dev->dev, "enabling device\n");
352 err = pci_enable_device(dev);
353 if (err)
354 goto config_release;
355
356 /* We need the device active to save the state. */
357 dev_dbg(&dev->dev, "save state of device\n");
358 pci_save_state(dev);
359 dev_data->pci_saved_state = pci_store_saved_state(dev);
360 if (!dev_data->pci_saved_state)
361 dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
362 else {
363 dev_dbg(&dev->dev, "reseting (FLR, D3, etc) the device\n");
364 __pci_reset_function_locked(dev);
365 pci_restore_state(dev);
366 }
367 /* Now disable the device (this also ensures some private device
368 * data is setup before we export)
369 */
370 dev_dbg(&dev->dev, "reset device\n");
371 xen_pcibk_reset_device(dev);
372
373 dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
374 return 0;
375
376 config_release:
377 xen_pcibk_config_free_dev(dev);
378
379 out:
380 pci_set_drvdata(dev, NULL);
381 kfree(dev_data);
382 return err;
383 }
384
385 /*
386 * Because some initialization still happens on
387 * devices during fs_initcall, we need to defer
388 * full initialization of our devices until
389 * device_initcall.
390 */
391 static int __init pcistub_init_devices_late(void)
392 {
393 struct pcistub_device *psdev;
394 unsigned long flags;
395 int err = 0;
396
397 pr_debug(DRV_NAME ": pcistub_init_devices_late\n");
398
399 spin_lock_irqsave(&pcistub_devices_lock, flags);
400
401 while (!list_empty(&seized_devices)) {
402 psdev = container_of(seized_devices.next,
403 struct pcistub_device, dev_list);
404 list_del(&psdev->dev_list);
405
406 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
407
408 err = pcistub_init_device(psdev->dev);
409 if (err) {
410 dev_err(&psdev->dev->dev,
411 "error %d initializing device\n", err);
412 kfree(psdev);
413 psdev = NULL;
414 }
415
416 spin_lock_irqsave(&pcistub_devices_lock, flags);
417
418 if (psdev)
419 list_add_tail(&psdev->dev_list, &pcistub_devices);
420 }
421
422 initialize_devices = 1;
423
424 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
425
426 return 0;
427 }
428
429 static int __devinit pcistub_seize(struct pci_dev *dev)
430 {
431 struct pcistub_device *psdev;
432 unsigned long flags;
433 int err = 0;
434
435 psdev = pcistub_device_alloc(dev);
436 if (!psdev)
437 return -ENOMEM;
438
439 spin_lock_irqsave(&pcistub_devices_lock, flags);
440
441 if (initialize_devices) {
442 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
443
444 /* don't want irqs disabled when calling pcistub_init_device */
445 err = pcistub_init_device(psdev->dev);
446
447 spin_lock_irqsave(&pcistub_devices_lock, flags);
448
449 if (!err)
450 list_add(&psdev->dev_list, &pcistub_devices);
451 } else {
452 dev_dbg(&dev->dev, "deferring initialization\n");
453 list_add(&psdev->dev_list, &seized_devices);
454 }
455
456 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
457
458 if (err)
459 pcistub_device_put(psdev);
460
461 return err;
462 }
463
464 static int __devinit pcistub_probe(struct pci_dev *dev,
465 const struct pci_device_id *id)
466 {
467 int err = 0;
468
469 dev_dbg(&dev->dev, "probing...\n");
470
471 if (pcistub_match(dev)) {
472
473 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
474 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
475 dev_err(&dev->dev, "can't export pci devices that "
476 "don't have a normal (0) or bridge (1) "
477 "header type!\n");
478 err = -ENODEV;
479 goto out;
480 }
481
482 dev_info(&dev->dev, "seizing device\n");
483 err = pcistub_seize(dev);
484 } else
485 /* Didn't find the device */
486 err = -ENODEV;
487
488 out:
489 return err;
490 }
491
492 static void pcistub_remove(struct pci_dev *dev)
493 {
494 struct pcistub_device *psdev, *found_psdev = NULL;
495 unsigned long flags;
496
497 dev_dbg(&dev->dev, "removing\n");
498
499 spin_lock_irqsave(&pcistub_devices_lock, flags);
500
501 xen_pcibk_config_quirk_release(dev);
502
503 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
504 if (psdev->dev == dev) {
505 found_psdev = psdev;
506 break;
507 }
508 }
509
510 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
511
512 if (found_psdev) {
513 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
514 found_psdev->pdev);
515
516 if (found_psdev->pdev) {
517 printk(KERN_WARNING DRV_NAME ": ****** removing device "
518 "%s while still in-use! ******\n",
519 pci_name(found_psdev->dev));
520 printk(KERN_WARNING DRV_NAME ": ****** driver domain may"
521 " still access this device's i/o resources!\n");
522 printk(KERN_WARNING DRV_NAME ": ****** shutdown driver "
523 "domain before binding device\n");
524 printk(KERN_WARNING DRV_NAME ": ****** to other drivers "
525 "or domains\n");
526
527 xen_pcibk_release_pci_dev(found_psdev->pdev,
528 found_psdev->dev);
529 }
530
531 spin_lock_irqsave(&pcistub_devices_lock, flags);
532 list_del(&found_psdev->dev_list);
533 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
534
535 /* the final put for releasing from the list */
536 pcistub_device_put(found_psdev);
537 }
538 }
539
540 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
541 {
542 .vendor = PCI_ANY_ID,
543 .device = PCI_ANY_ID,
544 .subvendor = PCI_ANY_ID,
545 .subdevice = PCI_ANY_ID,
546 },
547 {0,},
548 };
549
550 #define PCI_NODENAME_MAX 40
551 static void kill_domain_by_device(struct pcistub_device *psdev)
552 {
553 struct xenbus_transaction xbt;
554 int err;
555 char nodename[PCI_NODENAME_MAX];
556
557 BUG_ON(!psdev);
558 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
559 psdev->pdev->xdev->otherend_id);
560
561 again:
562 err = xenbus_transaction_start(&xbt);
563 if (err) {
564 dev_err(&psdev->dev->dev,
565 "error %d when start xenbus transaction\n", err);
566 return;
567 }
568 /*PV AER handlers will set this flag*/
569 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
570 err = xenbus_transaction_end(xbt, 0);
571 if (err) {
572 if (err == -EAGAIN)
573 goto again;
574 dev_err(&psdev->dev->dev,
575 "error %d when end xenbus transaction\n", err);
576 return;
577 }
578 }
579
580 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
581 * backend need to have cooperation. In xen_pcibk, those steps will do similar
582 * jobs: send service request and waiting for front_end response.
583 */
584 static pci_ers_result_t common_process(struct pcistub_device *psdev,
585 pci_channel_state_t state, int aer_cmd,
586 pci_ers_result_t result)
587 {
588 pci_ers_result_t res = result;
589 struct xen_pcie_aer_op *aer_op;
590 int ret;
591
592 /*with PV AER drivers*/
593 aer_op = &(psdev->pdev->sh_info->aer_op);
594 aer_op->cmd = aer_cmd ;
595 /*useful for error_detected callback*/
596 aer_op->err = state;
597 /*pcifront_end BDF*/
598 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
599 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
600 if (!ret) {
601 dev_err(&psdev->dev->dev,
602 DRV_NAME ": failed to get pcifront device\n");
603 return PCI_ERS_RESULT_NONE;
604 }
605 wmb();
606
607 dev_dbg(&psdev->dev->dev,
608 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
609 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
610 /*local flag to mark there's aer request, xen_pcibk callback will use
611 * this flag to judge whether we need to check pci-front give aer
612 * service ack signal
613 */
614 set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
615
616 /*It is possible that a pcifront conf_read_write ops request invokes
617 * the callback which cause the spurious execution of wake_up.
618 * Yet it is harmless and better than a spinlock here
619 */
620 set_bit(_XEN_PCIB_active,
621 (unsigned long *)&psdev->pdev->sh_info->flags);
622 wmb();
623 notify_remote_via_irq(psdev->pdev->evtchn_irq);
624
625 ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
626 !(test_bit(_XEN_PCIB_active, (unsigned long *)
627 &psdev->pdev->sh_info->flags)), 300*HZ);
628
629 if (!ret) {
630 if (test_bit(_XEN_PCIB_active,
631 (unsigned long *)&psdev->pdev->sh_info->flags)) {
632 dev_err(&psdev->dev->dev,
633 "pcifront aer process not responding!\n");
634 clear_bit(_XEN_PCIB_active,
635 (unsigned long *)&psdev->pdev->sh_info->flags);
636 aer_op->err = PCI_ERS_RESULT_NONE;
637 return res;
638 }
639 }
640 clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
641
642 if (test_bit(_XEN_PCIF_active,
643 (unsigned long *)&psdev->pdev->sh_info->flags)) {
644 dev_dbg(&psdev->dev->dev,
645 "schedule pci_conf service in " DRV_NAME "\n");
646 xen_pcibk_test_and_schedule_op(psdev->pdev);
647 }
648
649 res = (pci_ers_result_t)aer_op->err;
650 return res;
651 }
652
653 /*
654 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
655 * of the device driver could provide this service, and then wait for pcifront
656 * ack.
657 * @dev: pointer to PCI devices
658 * return value is used by aer_core do_recovery policy
659 */
660 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
661 {
662 struct pcistub_device *psdev;
663 pci_ers_result_t result;
664
665 result = PCI_ERS_RESULT_RECOVERED;
666 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
667 dev->bus->number, dev->devfn);
668
669 down_write(&pcistub_sem);
670 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
671 dev->bus->number,
672 PCI_SLOT(dev->devfn),
673 PCI_FUNC(dev->devfn));
674
675 if (!psdev || !psdev->pdev) {
676 dev_err(&dev->dev,
677 DRV_NAME " device is not found/assigned\n");
678 goto end;
679 }
680
681 if (!psdev->pdev->sh_info) {
682 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
683 " by HVM, kill it\n");
684 kill_domain_by_device(psdev);
685 goto end;
686 }
687
688 if (!test_bit(_XEN_PCIB_AERHANDLER,
689 (unsigned long *)&psdev->pdev->sh_info->flags)) {
690 dev_err(&dev->dev,
691 "guest with no AER driver should have been killed\n");
692 goto end;
693 }
694 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
695
696 if (result == PCI_ERS_RESULT_NONE ||
697 result == PCI_ERS_RESULT_DISCONNECT) {
698 dev_dbg(&dev->dev,
699 "No AER slot_reset service or disconnected!\n");
700 kill_domain_by_device(psdev);
701 }
702 end:
703 if (psdev)
704 pcistub_device_put(psdev);
705 up_write(&pcistub_sem);
706 return result;
707
708 }
709
710
711 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
712 * in case of the device driver could provide this service, and then wait
713 * for pcifront ack
714 * @dev: pointer to PCI devices
715 * return value is used by aer_core do_recovery policy
716 */
717
718 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
719 {
720 struct pcistub_device *psdev;
721 pci_ers_result_t result;
722
723 result = PCI_ERS_RESULT_RECOVERED;
724 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
725 dev->bus->number, dev->devfn);
726
727 down_write(&pcistub_sem);
728 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
729 dev->bus->number,
730 PCI_SLOT(dev->devfn),
731 PCI_FUNC(dev->devfn));
732
733 if (!psdev || !psdev->pdev) {
734 dev_err(&dev->dev,
735 DRV_NAME " device is not found/assigned\n");
736 goto end;
737 }
738
739 if (!psdev->pdev->sh_info) {
740 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
741 " by HVM, kill it\n");
742 kill_domain_by_device(psdev);
743 goto end;
744 }
745
746 if (!test_bit(_XEN_PCIB_AERHANDLER,
747 (unsigned long *)&psdev->pdev->sh_info->flags)) {
748 dev_err(&dev->dev,
749 "guest with no AER driver should have been killed\n");
750 goto end;
751 }
752 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
753
754 if (result == PCI_ERS_RESULT_NONE ||
755 result == PCI_ERS_RESULT_DISCONNECT) {
756 dev_dbg(&dev->dev,
757 "No AER mmio_enabled service or disconnected!\n");
758 kill_domain_by_device(psdev);
759 }
760 end:
761 if (psdev)
762 pcistub_device_put(psdev);
763 up_write(&pcistub_sem);
764 return result;
765 }
766
767 /*xen_pcibk_error_detected: it will send the error_detected request to pcifront
768 * in case of the device driver could provide this service, and then wait
769 * for pcifront ack.
770 * @dev: pointer to PCI devices
771 * @error: the current PCI connection state
772 * return value is used by aer_core do_recovery policy
773 */
774
775 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
776 pci_channel_state_t error)
777 {
778 struct pcistub_device *psdev;
779 pci_ers_result_t result;
780
781 result = PCI_ERS_RESULT_CAN_RECOVER;
782 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
783 dev->bus->number, dev->devfn);
784
785 down_write(&pcistub_sem);
786 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
787 dev->bus->number,
788 PCI_SLOT(dev->devfn),
789 PCI_FUNC(dev->devfn));
790
791 if (!psdev || !psdev->pdev) {
792 dev_err(&dev->dev,
793 DRV_NAME " device is not found/assigned\n");
794 goto end;
795 }
796
797 if (!psdev->pdev->sh_info) {
798 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
799 " by HVM, kill it\n");
800 kill_domain_by_device(psdev);
801 goto end;
802 }
803
804 /*Guest owns the device yet no aer handler regiested, kill guest*/
805 if (!test_bit(_XEN_PCIB_AERHANDLER,
806 (unsigned long *)&psdev->pdev->sh_info->flags)) {
807 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
808 kill_domain_by_device(psdev);
809 goto end;
810 }
811 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
812
813 if (result == PCI_ERS_RESULT_NONE ||
814 result == PCI_ERS_RESULT_DISCONNECT) {
815 dev_dbg(&dev->dev,
816 "No AER error_detected service or disconnected!\n");
817 kill_domain_by_device(psdev);
818 }
819 end:
820 if (psdev)
821 pcistub_device_put(psdev);
822 up_write(&pcistub_sem);
823 return result;
824 }
825
826 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront
827 * in case of the device driver could provide this service, and then wait
828 * for pcifront ack.
829 * @dev: pointer to PCI devices
830 */
831
832 static void xen_pcibk_error_resume(struct pci_dev *dev)
833 {
834 struct pcistub_device *psdev;
835
836 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
837 dev->bus->number, dev->devfn);
838
839 down_write(&pcistub_sem);
840 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
841 dev->bus->number,
842 PCI_SLOT(dev->devfn),
843 PCI_FUNC(dev->devfn));
844
845 if (!psdev || !psdev->pdev) {
846 dev_err(&dev->dev,
847 DRV_NAME " device is not found/assigned\n");
848 goto end;
849 }
850
851 if (!psdev->pdev->sh_info) {
852 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
853 " by HVM, kill it\n");
854 kill_domain_by_device(psdev);
855 goto end;
856 }
857
858 if (!test_bit(_XEN_PCIB_AERHANDLER,
859 (unsigned long *)&psdev->pdev->sh_info->flags)) {
860 dev_err(&dev->dev,
861 "guest with no AER driver should have been killed\n");
862 kill_domain_by_device(psdev);
863 goto end;
864 }
865 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
866 PCI_ERS_RESULT_RECOVERED);
867 end:
868 if (psdev)
869 pcistub_device_put(psdev);
870 up_write(&pcistub_sem);
871 return;
872 }
873
874 /*add xen_pcibk AER handling*/
875 static const struct pci_error_handlers xen_pcibk_error_handler = {
876 .error_detected = xen_pcibk_error_detected,
877 .mmio_enabled = xen_pcibk_mmio_enabled,
878 .slot_reset = xen_pcibk_slot_reset,
879 .resume = xen_pcibk_error_resume,
880 };
881
882 /*
883 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
884 * for a normal device. I don't want it to be loaded automatically.
885 */
886
887 static struct pci_driver xen_pcibk_pci_driver = {
888 /* The name should be xen_pciback, but until the tools are updated
889 * we will keep it as pciback. */
890 .name = "pciback",
891 .id_table = pcistub_ids,
892 .probe = pcistub_probe,
893 .remove = pcistub_remove,
894 .err_handler = &xen_pcibk_error_handler,
895 };
896
897 static inline int str_to_slot(const char *buf, int *domain, int *bus,
898 int *slot, int *func)
899 {
900 int err;
901 char wc = '*';
902
903 err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
904 switch (err) {
905 case 3:
906 *func = -1;
907 err = sscanf(buf, " %x:%x:%x.%c", domain, bus, slot, &wc);
908 break;
909 case 2:
910 *slot = *func = -1;
911 err = sscanf(buf, " %x:%x:*.%c", domain, bus, &wc);
912 if (err >= 2)
913 ++err;
914 break;
915 }
916 if (err == 4 && wc == '*')
917 return 0;
918 else if (err < 0)
919 return -EINVAL;
920
921 /* try again without domain */
922 *domain = 0;
923 wc = '*';
924 err = sscanf(buf, " %x:%x.%x", bus, slot, func);
925 switch (err) {
926 case 2:
927 *func = -1;
928 err = sscanf(buf, " %x:%x.%c", bus, slot, &wc);
929 break;
930 case 1:
931 *slot = *func = -1;
932 err = sscanf(buf, " %x:*.%c", bus, &wc) + 1;
933 break;
934 }
935 if (err == 3 && wc == '*')
936 return 0;
937
938 return -EINVAL;
939 }
940
941 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
942 *slot, int *func, int *reg, int *size, int *mask)
943 {
944 int err;
945
946 err =
947 sscanf(buf, " %04x:%02x:%02x.%d-%08x:%1x:%08x", domain, bus, slot,
948 func, reg, size, mask);
949 if (err == 7)
950 return 0;
951 return -EINVAL;
952 }
953
954 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
955 {
956 struct pcistub_device_id *pci_dev_id;
957 unsigned long flags;
958 int rc = 0;
959
960 if (slot < 0) {
961 for (slot = 0; !rc && slot < 32; ++slot)
962 rc = pcistub_device_id_add(domain, bus, slot, func);
963 return rc;
964 }
965
966 if (func < 0) {
967 for (func = 0; !rc && func < 8; ++func)
968 rc = pcistub_device_id_add(domain, bus, slot, func);
969 return rc;
970 }
971
972 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
973 if (!pci_dev_id)
974 return -ENOMEM;
975
976 pci_dev_id->domain = domain;
977 pci_dev_id->bus = bus;
978 pci_dev_id->devfn = PCI_DEVFN(slot, func);
979
980 pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%d\n",
981 domain, bus, slot, func);
982
983 spin_lock_irqsave(&device_ids_lock, flags);
984 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
985 spin_unlock_irqrestore(&device_ids_lock, flags);
986
987 return 0;
988 }
989
990 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
991 {
992 struct pcistub_device_id *pci_dev_id, *t;
993 int err = -ENOENT;
994 unsigned long flags;
995
996 spin_lock_irqsave(&device_ids_lock, flags);
997 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
998 slot_list) {
999 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus
1000 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot)
1001 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) {
1002 /* Don't break; here because it's possible the same
1003 * slot could be in the list more than once
1004 */
1005 list_del(&pci_dev_id->slot_list);
1006 kfree(pci_dev_id);
1007
1008 err = 0;
1009
1010 pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%d from "
1011 "seize list\n", domain, bus, slot, func);
1012 }
1013 }
1014 spin_unlock_irqrestore(&device_ids_lock, flags);
1015
1016 return err;
1017 }
1018
1019 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
1020 int size, int mask)
1021 {
1022 int err = 0;
1023 struct pcistub_device *psdev;
1024 struct pci_dev *dev;
1025 struct config_field *field;
1026
1027 psdev = pcistub_device_find(domain, bus, slot, func);
1028 if (!psdev) {
1029 err = -ENODEV;
1030 goto out;
1031 }
1032 dev = psdev->dev;
1033
1034 field = kzalloc(sizeof(*field), GFP_ATOMIC);
1035 if (!field) {
1036 err = -ENOMEM;
1037 goto out;
1038 }
1039
1040 field->offset = reg;
1041 field->size = size;
1042 field->mask = mask;
1043 field->init = NULL;
1044 field->reset = NULL;
1045 field->release = NULL;
1046 field->clean = xen_pcibk_config_field_free;
1047
1048 err = xen_pcibk_config_quirks_add_field(dev, field);
1049 if (err)
1050 kfree(field);
1051 out:
1052 if (psdev)
1053 pcistub_device_put(psdev);
1054 return err;
1055 }
1056
1057 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
1058 size_t count)
1059 {
1060 int domain, bus, slot, func;
1061 int err;
1062
1063 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1064 if (err)
1065 goto out;
1066
1067 err = pcistub_device_id_add(domain, bus, slot, func);
1068
1069 out:
1070 if (!err)
1071 err = count;
1072 return err;
1073 }
1074 static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
1075
1076 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1077 size_t count)
1078 {
1079 int domain, bus, slot, func;
1080 int err;
1081
1082 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1083 if (err)
1084 goto out;
1085
1086 err = pcistub_device_id_remove(domain, bus, slot, func);
1087
1088 out:
1089 if (!err)
1090 err = count;
1091 return err;
1092 }
1093 static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1094
1095 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1096 {
1097 struct pcistub_device_id *pci_dev_id;
1098 size_t count = 0;
1099 unsigned long flags;
1100
1101 spin_lock_irqsave(&device_ids_lock, flags);
1102 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1103 if (count >= PAGE_SIZE)
1104 break;
1105
1106 count += scnprintf(buf + count, PAGE_SIZE - count,
1107 "%04x:%02x:%02x.%d\n",
1108 pci_dev_id->domain, pci_dev_id->bus,
1109 PCI_SLOT(pci_dev_id->devfn),
1110 PCI_FUNC(pci_dev_id->devfn));
1111 }
1112 spin_unlock_irqrestore(&device_ids_lock, flags);
1113
1114 return count;
1115 }
1116 static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1117
1118 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1119 {
1120 struct pcistub_device *psdev;
1121 struct xen_pcibk_dev_data *dev_data;
1122 size_t count = 0;
1123 unsigned long flags;
1124
1125 spin_lock_irqsave(&pcistub_devices_lock, flags);
1126 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1127 if (count >= PAGE_SIZE)
1128 break;
1129 if (!psdev->dev)
1130 continue;
1131 dev_data = pci_get_drvdata(psdev->dev);
1132 if (!dev_data)
1133 continue;
1134 count +=
1135 scnprintf(buf + count, PAGE_SIZE - count,
1136 "%s:%s:%sing:%ld\n",
1137 pci_name(psdev->dev),
1138 dev_data->isr_on ? "on" : "off",
1139 dev_data->ack_intr ? "ack" : "not ack",
1140 dev_data->handled);
1141 }
1142 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1143 return count;
1144 }
1145 static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1146
1147 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1148 const char *buf,
1149 size_t count)
1150 {
1151 struct pcistub_device *psdev;
1152 struct xen_pcibk_dev_data *dev_data;
1153 int domain, bus, slot, func;
1154 int err = -ENOENT;
1155
1156 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1157 if (err)
1158 return err;
1159
1160 psdev = pcistub_device_find(domain, bus, slot, func);
1161 if (!psdev)
1162 goto out;
1163
1164 dev_data = pci_get_drvdata(psdev->dev);
1165 if (!dev_data)
1166 goto out;
1167
1168 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1169 dev_data->irq_name, dev_data->isr_on,
1170 !dev_data->isr_on);
1171
1172 dev_data->isr_on = !(dev_data->isr_on);
1173 if (dev_data->isr_on)
1174 dev_data->ack_intr = 1;
1175 out:
1176 if (psdev)
1177 pcistub_device_put(psdev);
1178 if (!err)
1179 err = count;
1180 return err;
1181 }
1182 static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
1183 pcistub_irq_handler_switch);
1184
1185 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1186 size_t count)
1187 {
1188 int domain, bus, slot, func, reg, size, mask;
1189 int err;
1190
1191 err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
1192 &mask);
1193 if (err)
1194 goto out;
1195
1196 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1197
1198 out:
1199 if (!err)
1200 err = count;
1201 return err;
1202 }
1203
1204 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1205 {
1206 int count = 0;
1207 unsigned long flags;
1208 struct xen_pcibk_config_quirk *quirk;
1209 struct xen_pcibk_dev_data *dev_data;
1210 const struct config_field *field;
1211 const struct config_field_entry *cfg_entry;
1212
1213 spin_lock_irqsave(&device_ids_lock, flags);
1214 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1215 if (count >= PAGE_SIZE)
1216 goto out;
1217
1218 count += scnprintf(buf + count, PAGE_SIZE - count,
1219 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1220 quirk->pdev->bus->number,
1221 PCI_SLOT(quirk->pdev->devfn),
1222 PCI_FUNC(quirk->pdev->devfn),
1223 quirk->devid.vendor, quirk->devid.device,
1224 quirk->devid.subvendor,
1225 quirk->devid.subdevice);
1226
1227 dev_data = pci_get_drvdata(quirk->pdev);
1228
1229 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1230 field = cfg_entry->field;
1231 if (count >= PAGE_SIZE)
1232 goto out;
1233
1234 count += scnprintf(buf + count, PAGE_SIZE - count,
1235 "\t\t%08x:%01x:%08x\n",
1236 cfg_entry->base_offset +
1237 field->offset, field->size,
1238 field->mask);
1239 }
1240 }
1241
1242 out:
1243 spin_unlock_irqrestore(&device_ids_lock, flags);
1244
1245 return count;
1246 }
1247 static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
1248 pcistub_quirk_add);
1249
1250 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1251 size_t count)
1252 {
1253 int domain, bus, slot, func;
1254 int err;
1255 struct pcistub_device *psdev;
1256 struct xen_pcibk_dev_data *dev_data;
1257 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1258 if (err)
1259 goto out;
1260 if (slot < 0 || func < 0) {
1261 err = -EINVAL;
1262 goto out;
1263 }
1264 psdev = pcistub_device_find(domain, bus, slot, func);
1265 if (!psdev) {
1266 err = -ENODEV;
1267 goto out;
1268 }
1269
1270 dev_data = pci_get_drvdata(psdev->dev);
1271 /* the driver data for a device should never be null at this point */
1272 if (!dev_data) {
1273 err = -ENXIO;
1274 goto release;
1275 }
1276 if (!dev_data->permissive) {
1277 dev_data->permissive = 1;
1278 /* Let user know that what they're doing could be unsafe */
1279 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1280 "configuration space accesses!\n");
1281 dev_warn(&psdev->dev->dev,
1282 "permissive mode is potentially unsafe!\n");
1283 }
1284 release:
1285 pcistub_device_put(psdev);
1286 out:
1287 if (!err)
1288 err = count;
1289 return err;
1290 }
1291
1292 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1293 {
1294 struct pcistub_device *psdev;
1295 struct xen_pcibk_dev_data *dev_data;
1296 size_t count = 0;
1297 unsigned long flags;
1298 spin_lock_irqsave(&pcistub_devices_lock, flags);
1299 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1300 if (count >= PAGE_SIZE)
1301 break;
1302 if (!psdev->dev)
1303 continue;
1304 dev_data = pci_get_drvdata(psdev->dev);
1305 if (!dev_data || !dev_data->permissive)
1306 continue;
1307 count +=
1308 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1309 pci_name(psdev->dev));
1310 }
1311 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1312 return count;
1313 }
1314 static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
1315 permissive_add);
1316
1317 static void pcistub_exit(void)
1318 {
1319 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1320 driver_remove_file(&xen_pcibk_pci_driver.driver,
1321 &driver_attr_remove_slot);
1322 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1323 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1324 driver_remove_file(&xen_pcibk_pci_driver.driver,
1325 &driver_attr_permissive);
1326 driver_remove_file(&xen_pcibk_pci_driver.driver,
1327 &driver_attr_irq_handlers);
1328 driver_remove_file(&xen_pcibk_pci_driver.driver,
1329 &driver_attr_irq_handler_state);
1330 pci_unregister_driver(&xen_pcibk_pci_driver);
1331 }
1332
1333 static int __init pcistub_init(void)
1334 {
1335 int pos = 0;
1336 int err = 0;
1337 int domain, bus, slot, func;
1338 int parsed;
1339
1340 if (pci_devs_to_hide && *pci_devs_to_hide) {
1341 do {
1342 char wc = '*';
1343
1344 parsed = 0;
1345
1346 err = sscanf(pci_devs_to_hide + pos,
1347 " (%x:%x:%x.%x) %n",
1348 &domain, &bus, &slot, &func, &parsed);
1349 switch (err) {
1350 case 3:
1351 func = -1;
1352 err = sscanf(pci_devs_to_hide + pos,
1353 " (%x:%x:%x.%c) %n",
1354 &domain, &bus, &slot, &wc,
1355 &parsed);
1356 break;
1357 case 2:
1358 slot = func = -1;
1359 err = sscanf(pci_devs_to_hide + pos,
1360 " (%x:%x:*.%c) %n",
1361 &domain, &bus, &wc, &parsed) + 1;
1362 break;
1363 }
1364
1365 if (err != 4 || wc != '*') {
1366 domain = 0;
1367 wc = '*';
1368 err = sscanf(pci_devs_to_hide + pos,
1369 " (%x:%x.%x) %n",
1370 &bus, &slot, &func, &parsed);
1371 switch (err) {
1372 case 2:
1373 func = -1;
1374 err = sscanf(pci_devs_to_hide + pos,
1375 " (%x:%x.%c) %n",
1376 &bus, &slot, &wc,
1377 &parsed);
1378 break;
1379 case 1:
1380 slot = func = -1;
1381 err = sscanf(pci_devs_to_hide + pos,
1382 " (%x:*.%c) %n",
1383 &bus, &wc, &parsed) + 1;
1384 break;
1385 }
1386 if (err != 3 || wc != '*')
1387 goto parse_error;
1388 }
1389
1390 err = pcistub_device_id_add(domain, bus, slot, func);
1391 if (err)
1392 goto out;
1393
1394 /* if parsed<=0, we've reached the end of the string */
1395 pos += parsed;
1396 } while (parsed > 0 && pci_devs_to_hide[pos]);
1397 }
1398
1399 /* If we're the first PCI Device Driver to register, we're the
1400 * first one to get offered PCI devices as they become
1401 * available (and thus we can be the first to grab them)
1402 */
1403 err = pci_register_driver(&xen_pcibk_pci_driver);
1404 if (err < 0)
1405 goto out;
1406
1407 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1408 &driver_attr_new_slot);
1409 if (!err)
1410 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1411 &driver_attr_remove_slot);
1412 if (!err)
1413 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1414 &driver_attr_slots);
1415 if (!err)
1416 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1417 &driver_attr_quirks);
1418 if (!err)
1419 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1420 &driver_attr_permissive);
1421
1422 if (!err)
1423 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1424 &driver_attr_irq_handlers);
1425 if (!err)
1426 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1427 &driver_attr_irq_handler_state);
1428 if (err)
1429 pcistub_exit();
1430
1431 out:
1432 return err;
1433
1434 parse_error:
1435 printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n",
1436 pci_devs_to_hide + pos);
1437 return -EINVAL;
1438 }
1439
1440 #ifndef MODULE
1441 /*
1442 * fs_initcall happens before device_initcall
1443 * so xen_pcibk *should* get called first (b/c we
1444 * want to suck up any device before other drivers
1445 * get a chance by being the first pci device
1446 * driver to register)
1447 */
1448 fs_initcall(pcistub_init);
1449 #endif
1450
1451 static int __init xen_pcibk_init(void)
1452 {
1453 int err;
1454
1455 if (!xen_initial_domain())
1456 return -ENODEV;
1457
1458 err = xen_pcibk_config_init();
1459 if (err)
1460 return err;
1461
1462 #ifdef MODULE
1463 err = pcistub_init();
1464 if (err < 0)
1465 return err;
1466 #endif
1467
1468 pcistub_init_devices_late();
1469 err = xen_pcibk_xenbus_register();
1470 if (err)
1471 pcistub_exit();
1472
1473 return err;
1474 }
1475
1476 static void __exit xen_pcibk_cleanup(void)
1477 {
1478 xen_pcibk_xenbus_unregister();
1479 pcistub_exit();
1480 }
1481
1482 module_init(xen_pcibk_init);
1483 module_exit(xen_pcibk_cleanup);
1484
1485 MODULE_LICENSE("Dual BSD/GPL");
1486 MODULE_ALIAS("xen-backend:pci");
Linux kernel - Deliverables
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