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make drivers with pci error handlers const
[linux-2.6/cjktty.git] / drivers / xen / xen-pciback / pci_stub.c
blob0f1539edbd01e6a835b1203777a314295fa9c17a
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 dev_dbg(&dev->dev, "reseting (FLR, D3, etc) the device\n");
357 __pci_reset_function_locked(dev);
358
359 /* We need the device active to save the state. */
360 dev_dbg(&dev->dev, "save state of device\n");
361 pci_save_state(dev);
362 dev_data->pci_saved_state = pci_store_saved_state(dev);
363 if (!dev_data->pci_saved_state)
364 dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
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");
CJK support for tty framebuffer vt