Merge commit 'v3.6-rc5' into next
[linux-3.10.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         }
366         /* Now disable the device (this also ensures some private device
367          * data is setup before we export)
368          */
369         dev_dbg(&dev->dev, "reset device\n");
370         xen_pcibk_reset_device(dev);
371
372         dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
373         return 0;
374
375 config_release:
376         xen_pcibk_config_free_dev(dev);
377
378 out:
379         pci_set_drvdata(dev, NULL);
380         kfree(dev_data);
381         return err;
382 }
383
384 /*
385  * Because some initialization still happens on
386  * devices during fs_initcall, we need to defer
387  * full initialization of our devices until
388  * device_initcall.
389  */
390 static int __init pcistub_init_devices_late(void)
391 {
392         struct pcistub_device *psdev;
393         unsigned long flags;
394         int err = 0;
395
396         pr_debug(DRV_NAME ": pcistub_init_devices_late\n");
397
398         spin_lock_irqsave(&pcistub_devices_lock, flags);
399
400         while (!list_empty(&seized_devices)) {
401                 psdev = container_of(seized_devices.next,
402                                      struct pcistub_device, dev_list);
403                 list_del(&psdev->dev_list);
404
405                 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
406
407                 err = pcistub_init_device(psdev->dev);
408                 if (err) {
409                         dev_err(&psdev->dev->dev,
410                                 "error %d initializing device\n", err);
411                         kfree(psdev);
412                         psdev = NULL;
413                 }
414
415                 spin_lock_irqsave(&pcistub_devices_lock, flags);
416
417                 if (psdev)
418                         list_add_tail(&psdev->dev_list, &pcistub_devices);
419         }
420
421         initialize_devices = 1;
422
423         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
424
425         return 0;
426 }
427
428 static int __devinit pcistub_seize(struct pci_dev *dev)
429 {
430         struct pcistub_device *psdev;
431         unsigned long flags;
432         int err = 0;
433
434         psdev = pcistub_device_alloc(dev);
435         if (!psdev)
436                 return -ENOMEM;
437
438         spin_lock_irqsave(&pcistub_devices_lock, flags);
439
440         if (initialize_devices) {
441                 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
442
443                 /* don't want irqs disabled when calling pcistub_init_device */
444                 err = pcistub_init_device(psdev->dev);
445
446                 spin_lock_irqsave(&pcistub_devices_lock, flags);
447
448                 if (!err)
449                         list_add(&psdev->dev_list, &pcistub_devices);
450         } else {
451                 dev_dbg(&dev->dev, "deferring initialization\n");
452                 list_add(&psdev->dev_list, &seized_devices);
453         }
454
455         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
456
457         if (err)
458                 pcistub_device_put(psdev);
459
460         return err;
461 }
462
463 static int __devinit pcistub_probe(struct pci_dev *dev,
464                                    const struct pci_device_id *id)
465 {
466         int err = 0;
467
468         dev_dbg(&dev->dev, "probing...\n");
469
470         if (pcistub_match(dev)) {
471
472                 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
473                     && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
474                         dev_err(&dev->dev, "can't export pci devices that "
475                                 "don't have a normal (0) or bridge (1) "
476                                 "header type!\n");
477                         err = -ENODEV;
478                         goto out;
479                 }
480
481                 dev_info(&dev->dev, "seizing device\n");
482                 err = pcistub_seize(dev);
483         } else
484                 /* Didn't find the device */
485                 err = -ENODEV;
486
487 out:
488         return err;
489 }
490
491 static void pcistub_remove(struct pci_dev *dev)
492 {
493         struct pcistub_device *psdev, *found_psdev = NULL;
494         unsigned long flags;
495
496         dev_dbg(&dev->dev, "removing\n");
497
498         spin_lock_irqsave(&pcistub_devices_lock, flags);
499
500         xen_pcibk_config_quirk_release(dev);
501
502         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
503                 if (psdev->dev == dev) {
504                         found_psdev = psdev;
505                         break;
506                 }
507         }
508
509         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
510
511         if (found_psdev) {
512                 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
513                         found_psdev->pdev);
514
515                 if (found_psdev->pdev) {
516                         printk(KERN_WARNING DRV_NAME ": ****** removing device "
517                                "%s while still in-use! ******\n",
518                                pci_name(found_psdev->dev));
519                         printk(KERN_WARNING DRV_NAME ": ****** driver domain may"
520                                " still access this device's i/o resources!\n");
521                         printk(KERN_WARNING DRV_NAME ": ****** shutdown driver "
522                                "domain before binding device\n");
523                         printk(KERN_WARNING DRV_NAME ": ****** to other drivers "
524                                "or domains\n");
525
526                         xen_pcibk_release_pci_dev(found_psdev->pdev,
527                                                 found_psdev->dev);
528                 }
529
530                 spin_lock_irqsave(&pcistub_devices_lock, flags);
531                 list_del(&found_psdev->dev_list);
532                 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
533
534                 /* the final put for releasing from the list */
535                 pcistub_device_put(found_psdev);
536         }
537 }
538
539 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
540         {
541          .vendor = PCI_ANY_ID,
542          .device = PCI_ANY_ID,
543          .subvendor = PCI_ANY_ID,
544          .subdevice = PCI_ANY_ID,
545          },
546         {0,},
547 };
548
549 #define PCI_NODENAME_MAX 40
550 static void kill_domain_by_device(struct pcistub_device *psdev)
551 {
552         struct xenbus_transaction xbt;
553         int err;
554         char nodename[PCI_NODENAME_MAX];
555
556         BUG_ON(!psdev);
557         snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
558                 psdev->pdev->xdev->otherend_id);
559
560 again:
561         err = xenbus_transaction_start(&xbt);
562         if (err) {
563                 dev_err(&psdev->dev->dev,
564                         "error %d when start xenbus transaction\n", err);
565                 return;
566         }
567         /*PV AER handlers will set this flag*/
568         xenbus_printf(xbt, nodename, "aerState" , "aerfail");
569         err = xenbus_transaction_end(xbt, 0);
570         if (err) {
571                 if (err == -EAGAIN)
572                         goto again;
573                 dev_err(&psdev->dev->dev,
574                         "error %d when end xenbus transaction\n", err);
575                 return;
576         }
577 }
578
579 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
580  * backend need to have cooperation. In xen_pcibk, those steps will do similar
581  * jobs: send service request and waiting for front_end response.
582 */
583 static pci_ers_result_t common_process(struct pcistub_device *psdev,
584                                        pci_channel_state_t state, int aer_cmd,
585                                        pci_ers_result_t result)
586 {
587         pci_ers_result_t res = result;
588         struct xen_pcie_aer_op *aer_op;
589         int ret;
590
591         /*with PV AER drivers*/
592         aer_op = &(psdev->pdev->sh_info->aer_op);
593         aer_op->cmd = aer_cmd ;
594         /*useful for error_detected callback*/
595         aer_op->err = state;
596         /*pcifront_end BDF*/
597         ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
598                 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
599         if (!ret) {
600                 dev_err(&psdev->dev->dev,
601                         DRV_NAME ": failed to get pcifront device\n");
602                 return PCI_ERS_RESULT_NONE;
603         }
604         wmb();
605
606         dev_dbg(&psdev->dev->dev,
607                         DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
608                         aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
609         /*local flag to mark there's aer request, xen_pcibk callback will use
610         * this flag to judge whether we need to check pci-front give aer
611         * service ack signal
612         */
613         set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
614
615         /*It is possible that a pcifront conf_read_write ops request invokes
616         * the callback which cause the spurious execution of wake_up.
617         * Yet it is harmless and better than a spinlock here
618         */
619         set_bit(_XEN_PCIB_active,
620                 (unsigned long *)&psdev->pdev->sh_info->flags);
621         wmb();
622         notify_remote_via_irq(psdev->pdev->evtchn_irq);
623
624         ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
625                                  !(test_bit(_XEN_PCIB_active, (unsigned long *)
626                                  &psdev->pdev->sh_info->flags)), 300*HZ);
627
628         if (!ret) {
629                 if (test_bit(_XEN_PCIB_active,
630                         (unsigned long *)&psdev->pdev->sh_info->flags)) {
631                         dev_err(&psdev->dev->dev,
632                                 "pcifront aer process not responding!\n");
633                         clear_bit(_XEN_PCIB_active,
634                           (unsigned long *)&psdev->pdev->sh_info->flags);
635                         aer_op->err = PCI_ERS_RESULT_NONE;
636                         return res;
637                 }
638         }
639         clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
640
641         if (test_bit(_XEN_PCIF_active,
642                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
643                 dev_dbg(&psdev->dev->dev,
644                         "schedule pci_conf service in " DRV_NAME "\n");
645                 xen_pcibk_test_and_schedule_op(psdev->pdev);
646         }
647
648         res = (pci_ers_result_t)aer_op->err;
649         return res;
650 }
651
652 /*
653 * xen_pcibk_slot_reset: it will send the slot_reset request to  pcifront in case
654 * of the device driver could provide this service, and then wait for pcifront
655 * ack.
656 * @dev: pointer to PCI devices
657 * return value is used by aer_core do_recovery policy
658 */
659 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
660 {
661         struct pcistub_device *psdev;
662         pci_ers_result_t result;
663
664         result = PCI_ERS_RESULT_RECOVERED;
665         dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
666                 dev->bus->number, dev->devfn);
667
668         down_write(&pcistub_sem);
669         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
670                                 dev->bus->number,
671                                 PCI_SLOT(dev->devfn),
672                                 PCI_FUNC(dev->devfn));
673
674         if (!psdev || !psdev->pdev) {
675                 dev_err(&dev->dev,
676                         DRV_NAME " device is not found/assigned\n");
677                 goto end;
678         }
679
680         if (!psdev->pdev->sh_info) {
681                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
682                         " by HVM, kill it\n");
683                 kill_domain_by_device(psdev);
684                 goto release;
685         }
686
687         if (!test_bit(_XEN_PCIB_AERHANDLER,
688                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
689                 dev_err(&dev->dev,
690                         "guest with no AER driver should have been killed\n");
691                 goto release;
692         }
693         result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
694
695         if (result == PCI_ERS_RESULT_NONE ||
696                 result == PCI_ERS_RESULT_DISCONNECT) {
697                 dev_dbg(&dev->dev,
698                         "No AER slot_reset service or disconnected!\n");
699                 kill_domain_by_device(psdev);
700         }
701 release:
702         pcistub_device_put(psdev);
703 end:
704         up_write(&pcistub_sem);
705         return result;
706
707 }
708
709
710 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to  pcifront
711 * in case of the device driver could provide this service, and then wait
712 * for pcifront ack
713 * @dev: pointer to PCI devices
714 * return value is used by aer_core do_recovery policy
715 */
716
717 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
718 {
719         struct pcistub_device *psdev;
720         pci_ers_result_t result;
721
722         result = PCI_ERS_RESULT_RECOVERED;
723         dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
724                 dev->bus->number, dev->devfn);
725
726         down_write(&pcistub_sem);
727         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
728                                 dev->bus->number,
729                                 PCI_SLOT(dev->devfn),
730                                 PCI_FUNC(dev->devfn));
731
732         if (!psdev || !psdev->pdev) {
733                 dev_err(&dev->dev,
734                         DRV_NAME " device is not found/assigned\n");
735                 goto end;
736         }
737
738         if (!psdev->pdev->sh_info) {
739                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
740                         " by HVM, kill it\n");
741                 kill_domain_by_device(psdev);
742                 goto release;
743         }
744
745         if (!test_bit(_XEN_PCIB_AERHANDLER,
746                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
747                 dev_err(&dev->dev,
748                         "guest with no AER driver should have been killed\n");
749                 goto release;
750         }
751         result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
752
753         if (result == PCI_ERS_RESULT_NONE ||
754                 result == PCI_ERS_RESULT_DISCONNECT) {
755                 dev_dbg(&dev->dev,
756                         "No AER mmio_enabled service or disconnected!\n");
757                 kill_domain_by_device(psdev);
758         }
759 release:
760         pcistub_device_put(psdev);
761 end:
762         up_write(&pcistub_sem);
763         return result;
764 }
765
766 /*xen_pcibk_error_detected: it will send the error_detected request to  pcifront
767 * in case of the device driver could provide this service, and then wait
768 * for pcifront ack.
769 * @dev: pointer to PCI devices
770 * @error: the current PCI connection state
771 * return value is used by aer_core do_recovery policy
772 */
773
774 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
775         pci_channel_state_t error)
776 {
777         struct pcistub_device *psdev;
778         pci_ers_result_t result;
779
780         result = PCI_ERS_RESULT_CAN_RECOVER;
781         dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
782                 dev->bus->number, dev->devfn);
783
784         down_write(&pcistub_sem);
785         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
786                                 dev->bus->number,
787                                 PCI_SLOT(dev->devfn),
788                                 PCI_FUNC(dev->devfn));
789
790         if (!psdev || !psdev->pdev) {
791                 dev_err(&dev->dev,
792                         DRV_NAME " device is not found/assigned\n");
793                 goto end;
794         }
795
796         if (!psdev->pdev->sh_info) {
797                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
798                         " by HVM, kill it\n");
799                 kill_domain_by_device(psdev);
800                 goto release;
801         }
802
803         /*Guest owns the device yet no aer handler regiested, kill guest*/
804         if (!test_bit(_XEN_PCIB_AERHANDLER,
805                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
806                 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
807                 kill_domain_by_device(psdev);
808                 goto release;
809         }
810         result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
811
812         if (result == PCI_ERS_RESULT_NONE ||
813                 result == PCI_ERS_RESULT_DISCONNECT) {
814                 dev_dbg(&dev->dev,
815                         "No AER error_detected service or disconnected!\n");
816                 kill_domain_by_device(psdev);
817         }
818 release:
819         pcistub_device_put(psdev);
820 end:
821         up_write(&pcistub_sem);
822         return result;
823 }
824
825 /*xen_pcibk_error_resume: it will send the error_resume request to  pcifront
826 * in case of the device driver could provide this service, and then wait
827 * for pcifront ack.
828 * @dev: pointer to PCI devices
829 */
830
831 static void xen_pcibk_error_resume(struct pci_dev *dev)
832 {
833         struct pcistub_device *psdev;
834
835         dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
836                 dev->bus->number, dev->devfn);
837
838         down_write(&pcistub_sem);
839         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
840                                 dev->bus->number,
841                                 PCI_SLOT(dev->devfn),
842                                 PCI_FUNC(dev->devfn));
843
844         if (!psdev || !psdev->pdev) {
845                 dev_err(&dev->dev,
846                         DRV_NAME " device is not found/assigned\n");
847                 goto end;
848         }
849
850         if (!psdev->pdev->sh_info) {
851                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
852                         " by HVM, kill it\n");
853                 kill_domain_by_device(psdev);
854                 goto release;
855         }
856
857         if (!test_bit(_XEN_PCIB_AERHANDLER,
858                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
859                 dev_err(&dev->dev,
860                         "guest with no AER driver should have been killed\n");
861                 kill_domain_by_device(psdev);
862                 goto release;
863         }
864         common_process(psdev, 1, XEN_PCI_OP_aer_resume,
865                        PCI_ERS_RESULT_RECOVERED);
866 release:
867         pcistub_device_put(psdev);
868 end:
869         up_write(&pcistub_sem);
870         return;
871 }
872
873 /*add xen_pcibk AER handling*/
874 static const struct pci_error_handlers xen_pcibk_error_handler = {
875         .error_detected = xen_pcibk_error_detected,
876         .mmio_enabled = xen_pcibk_mmio_enabled,
877         .slot_reset = xen_pcibk_slot_reset,
878         .resume = xen_pcibk_error_resume,
879 };
880
881 /*
882  * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
883  * for a normal device. I don't want it to be loaded automatically.
884  */
885
886 static struct pci_driver xen_pcibk_pci_driver = {
887         /* The name should be xen_pciback, but until the tools are updated
888          * we will keep it as pciback. */
889         .name = "pciback",
890         .id_table = pcistub_ids,
891         .probe = pcistub_probe,
892         .remove = pcistub_remove,
893         .err_handler = &xen_pcibk_error_handler,
894 };
895
896 static inline int str_to_slot(const char *buf, int *domain, int *bus,
897                               int *slot, int *func)
898 {
899         int err;
900
901         err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
902         if (err == 4)
903                 return 0;
904         else if (err < 0)
905                 return -EINVAL;
906
907         /* try again without domain */
908         *domain = 0;
909         err = sscanf(buf, " %x:%x.%x", bus, slot, func);
910         if (err == 3)
911                 return 0;
912
913         return -EINVAL;
914 }
915
916 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
917                                *slot, int *func, int *reg, int *size, int *mask)
918 {
919         int err;
920
921         err =
922             sscanf(buf, " %04x:%02x:%02x.%d-%08x:%1x:%08x", domain, bus, slot,
923                    func, reg, size, mask);
924         if (err == 7)
925                 return 0;
926         return -EINVAL;
927 }
928
929 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
930 {
931         struct pcistub_device_id *pci_dev_id;
932         unsigned long flags;
933
934         pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
935         if (!pci_dev_id)
936                 return -ENOMEM;
937
938         pci_dev_id->domain = domain;
939         pci_dev_id->bus = bus;
940         pci_dev_id->devfn = PCI_DEVFN(slot, func);
941
942         pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%d\n",
943                  domain, bus, slot, func);
944
945         spin_lock_irqsave(&device_ids_lock, flags);
946         list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
947         spin_unlock_irqrestore(&device_ids_lock, flags);
948
949         return 0;
950 }
951
952 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
953 {
954         struct pcistub_device_id *pci_dev_id, *t;
955         int devfn = PCI_DEVFN(slot, func);
956         int err = -ENOENT;
957         unsigned long flags;
958
959         spin_lock_irqsave(&device_ids_lock, flags);
960         list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
961                                  slot_list) {
962                 if (pci_dev_id->domain == domain
963                     && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) {
964                         /* Don't break; here because it's possible the same
965                          * slot could be in the list more than once
966                          */
967                         list_del(&pci_dev_id->slot_list);
968                         kfree(pci_dev_id);
969
970                         err = 0;
971
972                         pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%d from "
973                                  "seize list\n", domain, bus, slot, func);
974                 }
975         }
976         spin_unlock_irqrestore(&device_ids_lock, flags);
977
978         return err;
979 }
980
981 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
982                            int size, int mask)
983 {
984         int err = 0;
985         struct pcistub_device *psdev;
986         struct pci_dev *dev;
987         struct config_field *field;
988
989         psdev = pcistub_device_find(domain, bus, slot, func);
990         if (!psdev || !psdev->dev) {
991                 err = -ENODEV;
992                 goto out;
993         }
994         dev = psdev->dev;
995
996         field = kzalloc(sizeof(*field), GFP_ATOMIC);
997         if (!field) {
998                 err = -ENOMEM;
999                 goto out;
1000         }
1001
1002         field->offset = reg;
1003         field->size = size;
1004         field->mask = mask;
1005         field->init = NULL;
1006         field->reset = NULL;
1007         field->release = NULL;
1008         field->clean = xen_pcibk_config_field_free;
1009
1010         err = xen_pcibk_config_quirks_add_field(dev, field);
1011         if (err)
1012                 kfree(field);
1013 out:
1014         return err;
1015 }
1016
1017 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
1018                                 size_t count)
1019 {
1020         int domain, bus, slot, func;
1021         int err;
1022
1023         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1024         if (err)
1025                 goto out;
1026
1027         err = pcistub_device_id_add(domain, bus, slot, func);
1028
1029 out:
1030         if (!err)
1031                 err = count;
1032         return err;
1033 }
1034 static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
1035
1036 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1037                                    size_t count)
1038 {
1039         int domain, bus, slot, func;
1040         int err;
1041
1042         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1043         if (err)
1044                 goto out;
1045
1046         err = pcistub_device_id_remove(domain, bus, slot, func);
1047
1048 out:
1049         if (!err)
1050                 err = count;
1051         return err;
1052 }
1053 static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1054
1055 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1056 {
1057         struct pcistub_device_id *pci_dev_id;
1058         size_t count = 0;
1059         unsigned long flags;
1060
1061         spin_lock_irqsave(&device_ids_lock, flags);
1062         list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1063                 if (count >= PAGE_SIZE)
1064                         break;
1065
1066                 count += scnprintf(buf + count, PAGE_SIZE - count,
1067                                    "%04x:%02x:%02x.%d\n",
1068                                    pci_dev_id->domain, pci_dev_id->bus,
1069                                    PCI_SLOT(pci_dev_id->devfn),
1070                                    PCI_FUNC(pci_dev_id->devfn));
1071         }
1072         spin_unlock_irqrestore(&device_ids_lock, flags);
1073
1074         return count;
1075 }
1076 static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1077
1078 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1079 {
1080         struct pcistub_device *psdev;
1081         struct xen_pcibk_dev_data *dev_data;
1082         size_t count = 0;
1083         unsigned long flags;
1084
1085         spin_lock_irqsave(&pcistub_devices_lock, flags);
1086         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1087                 if (count >= PAGE_SIZE)
1088                         break;
1089                 if (!psdev->dev)
1090                         continue;
1091                 dev_data = pci_get_drvdata(psdev->dev);
1092                 if (!dev_data)
1093                         continue;
1094                 count +=
1095                     scnprintf(buf + count, PAGE_SIZE - count,
1096                               "%s:%s:%sing:%ld\n",
1097                               pci_name(psdev->dev),
1098                               dev_data->isr_on ? "on" : "off",
1099                               dev_data->ack_intr ? "ack" : "not ack",
1100                               dev_data->handled);
1101         }
1102         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1103         return count;
1104 }
1105 static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1106
1107 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1108                                           const char *buf,
1109                                           size_t count)
1110 {
1111         struct pcistub_device *psdev;
1112         struct xen_pcibk_dev_data *dev_data;
1113         int domain, bus, slot, func;
1114         int err = -ENOENT;
1115
1116         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1117         if (err)
1118                 goto out;
1119
1120         psdev = pcistub_device_find(domain, bus, slot, func);
1121
1122         if (!psdev)
1123                 goto out;
1124
1125         dev_data = pci_get_drvdata(psdev->dev);
1126         if (!dev_data)
1127                 goto out;
1128
1129         dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1130                 dev_data->irq_name, dev_data->isr_on,
1131                 !dev_data->isr_on);
1132
1133         dev_data->isr_on = !(dev_data->isr_on);
1134         if (dev_data->isr_on)
1135                 dev_data->ack_intr = 1;
1136 out:
1137         if (!err)
1138                 err = count;
1139         return err;
1140 }
1141 static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
1142                    pcistub_irq_handler_switch);
1143
1144 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1145                                  size_t count)
1146 {
1147         int domain, bus, slot, func, reg, size, mask;
1148         int err;
1149
1150         err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
1151                            &mask);
1152         if (err)
1153                 goto out;
1154
1155         err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1156
1157 out:
1158         if (!err)
1159                 err = count;
1160         return err;
1161 }
1162
1163 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1164 {
1165         int count = 0;
1166         unsigned long flags;
1167         struct xen_pcibk_config_quirk *quirk;
1168         struct xen_pcibk_dev_data *dev_data;
1169         const struct config_field *field;
1170         const struct config_field_entry *cfg_entry;
1171
1172         spin_lock_irqsave(&device_ids_lock, flags);
1173         list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1174                 if (count >= PAGE_SIZE)
1175                         goto out;
1176
1177                 count += scnprintf(buf + count, PAGE_SIZE - count,
1178                                    "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1179                                    quirk->pdev->bus->number,
1180                                    PCI_SLOT(quirk->pdev->devfn),
1181                                    PCI_FUNC(quirk->pdev->devfn),
1182                                    quirk->devid.vendor, quirk->devid.device,
1183                                    quirk->devid.subvendor,
1184                                    quirk->devid.subdevice);
1185
1186                 dev_data = pci_get_drvdata(quirk->pdev);
1187
1188                 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1189                         field = cfg_entry->field;
1190                         if (count >= PAGE_SIZE)
1191                                 goto out;
1192
1193                         count += scnprintf(buf + count, PAGE_SIZE - count,
1194                                            "\t\t%08x:%01x:%08x\n",
1195                                            cfg_entry->base_offset +
1196                                            field->offset, field->size,
1197                                            field->mask);
1198                 }
1199         }
1200
1201 out:
1202         spin_unlock_irqrestore(&device_ids_lock, flags);
1203
1204         return count;
1205 }
1206 static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
1207                    pcistub_quirk_add);
1208
1209 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1210                               size_t count)
1211 {
1212         int domain, bus, slot, func;
1213         int err;
1214         struct pcistub_device *psdev;
1215         struct xen_pcibk_dev_data *dev_data;
1216         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1217         if (err)
1218                 goto out;
1219         psdev = pcistub_device_find(domain, bus, slot, func);
1220         if (!psdev) {
1221                 err = -ENODEV;
1222                 goto out;
1223         }
1224         if (!psdev->dev) {
1225                 err = -ENODEV;
1226                 goto release;
1227         }
1228         dev_data = pci_get_drvdata(psdev->dev);
1229         /* the driver data for a device should never be null at this point */
1230         if (!dev_data) {
1231                 err = -ENXIO;
1232                 goto release;
1233         }
1234         if (!dev_data->permissive) {
1235                 dev_data->permissive = 1;
1236                 /* Let user know that what they're doing could be unsafe */
1237                 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1238                          "configuration space accesses!\n");
1239                 dev_warn(&psdev->dev->dev,
1240                          "permissive mode is potentially unsafe!\n");
1241         }
1242 release:
1243         pcistub_device_put(psdev);
1244 out:
1245         if (!err)
1246                 err = count;
1247         return err;
1248 }
1249
1250 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1251 {
1252         struct pcistub_device *psdev;
1253         struct xen_pcibk_dev_data *dev_data;
1254         size_t count = 0;
1255         unsigned long flags;
1256         spin_lock_irqsave(&pcistub_devices_lock, flags);
1257         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1258                 if (count >= PAGE_SIZE)
1259                         break;
1260                 if (!psdev->dev)
1261                         continue;
1262                 dev_data = pci_get_drvdata(psdev->dev);
1263                 if (!dev_data || !dev_data->permissive)
1264                         continue;
1265                 count +=
1266                     scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1267                               pci_name(psdev->dev));
1268         }
1269         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1270         return count;
1271 }
1272 static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
1273                    permissive_add);
1274
1275 static void pcistub_exit(void)
1276 {
1277         driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1278         driver_remove_file(&xen_pcibk_pci_driver.driver,
1279                            &driver_attr_remove_slot);
1280         driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1281         driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1282         driver_remove_file(&xen_pcibk_pci_driver.driver,
1283                            &driver_attr_permissive);
1284         driver_remove_file(&xen_pcibk_pci_driver.driver,
1285                            &driver_attr_irq_handlers);
1286         driver_remove_file(&xen_pcibk_pci_driver.driver,
1287                            &driver_attr_irq_handler_state);
1288         pci_unregister_driver(&xen_pcibk_pci_driver);
1289 }
1290
1291 static int __init pcistub_init(void)
1292 {
1293         int pos = 0;
1294         int err = 0;
1295         int domain, bus, slot, func;
1296         int parsed;
1297
1298         if (pci_devs_to_hide && *pci_devs_to_hide) {
1299                 do {
1300                         parsed = 0;
1301
1302                         err = sscanf(pci_devs_to_hide + pos,
1303                                      " (%x:%x:%x.%x) %n",
1304                                      &domain, &bus, &slot, &func, &parsed);
1305                         if (err != 4) {
1306                                 domain = 0;
1307                                 err = sscanf(pci_devs_to_hide + pos,
1308                                              " (%x:%x.%x) %n",
1309                                              &bus, &slot, &func, &parsed);
1310                                 if (err != 3)
1311                                         goto parse_error;
1312                         }
1313
1314                         err = pcistub_device_id_add(domain, bus, slot, func);
1315                         if (err)
1316                                 goto out;
1317
1318                         /* if parsed<=0, we've reached the end of the string */
1319                         pos += parsed;
1320                 } while (parsed > 0 && pci_devs_to_hide[pos]);
1321         }
1322
1323         /* If we're the first PCI Device Driver to register, we're the
1324          * first one to get offered PCI devices as they become
1325          * available (and thus we can be the first to grab them)
1326          */
1327         err = pci_register_driver(&xen_pcibk_pci_driver);
1328         if (err < 0)
1329                 goto out;
1330
1331         err = driver_create_file(&xen_pcibk_pci_driver.driver,
1332                                  &driver_attr_new_slot);
1333         if (!err)
1334                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1335                                          &driver_attr_remove_slot);
1336         if (!err)
1337                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1338                                          &driver_attr_slots);
1339         if (!err)
1340                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1341                                          &driver_attr_quirks);
1342         if (!err)
1343                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1344                                          &driver_attr_permissive);
1345
1346         if (!err)
1347                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1348                                          &driver_attr_irq_handlers);
1349         if (!err)
1350                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1351                                         &driver_attr_irq_handler_state);
1352         if (err)
1353                 pcistub_exit();
1354
1355 out:
1356         return err;
1357
1358 parse_error:
1359         printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n",
1360                pci_devs_to_hide + pos);
1361         return -EINVAL;
1362 }
1363
1364 #ifndef MODULE
1365 /*
1366  * fs_initcall happens before device_initcall
1367  * so xen_pcibk *should* get called first (b/c we
1368  * want to suck up any device before other drivers
1369  * get a chance by being the first pci device
1370  * driver to register)
1371  */
1372 fs_initcall(pcistub_init);
1373 #endif
1374
1375 static int __init xen_pcibk_init(void)
1376 {
1377         int err;
1378
1379         if (!xen_initial_domain())
1380                 return -ENODEV;
1381
1382         err = xen_pcibk_config_init();
1383         if (err)
1384                 return err;
1385
1386 #ifdef MODULE
1387         err = pcistub_init();
1388         if (err < 0)
1389                 return err;
1390 #endif
1391
1392         pcistub_init_devices_late();
1393         err = xen_pcibk_xenbus_register();
1394         if (err)
1395                 pcistub_exit();
1396
1397         return err;
1398 }
1399
1400 static void __exit xen_pcibk_cleanup(void)
1401 {
1402         xen_pcibk_xenbus_unregister();
1403         pcistub_exit();
1404 }
1405
1406 module_init(xen_pcibk_init);
1407 module_exit(xen_pcibk_cleanup);
1408
1409 MODULE_LICENSE("Dual BSD/GPL");
1410 MODULE_ALIAS("xen-backend:pci");